From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/fs/ceph/Kconfig | 40 + kernel/fs/ceph/Makefile | 13 + kernel/fs/ceph/acl.c | 263 +++ kernel/fs/ceph/addr.c | 1599 ++++++++++++++++++ kernel/fs/ceph/cache.c | 402 +++++ kernel/fs/ceph/cache.h | 182 ++ kernel/fs/ceph/caps.c | 3456 ++++++++++++++++++++++++++++++++++++++ kernel/fs/ceph/ceph_frag.c | 22 + kernel/fs/ceph/debugfs.c | 321 ++++ kernel/fs/ceph/dir.c | 1411 ++++++++++++++++ kernel/fs/ceph/export.c | 250 +++ kernel/fs/ceph/file.c | 1344 +++++++++++++++ kernel/fs/ceph/inode.c | 2016 ++++++++++++++++++++++ kernel/fs/ceph/ioctl.c | 295 ++++ kernel/fs/ceph/ioctl.h | 100 ++ kernel/fs/ceph/locks.c | 381 +++++ kernel/fs/ceph/mds_client.c | 3871 +++++++++++++++++++++++++++++++++++++++++++ kernel/fs/ceph/mds_client.h | 406 +++++ kernel/fs/ceph/mdsmap.c | 189 +++ kernel/fs/ceph/snap.c | 977 +++++++++++ kernel/fs/ceph/strings.c | 125 ++ kernel/fs/ceph/super.c | 1059 ++++++++++++ kernel/fs/ceph/super.h | 946 +++++++++++ kernel/fs/ceph/xattr.c | 1117 +++++++++++++ 24 files changed, 20785 insertions(+) create mode 100644 kernel/fs/ceph/Kconfig create mode 100644 kernel/fs/ceph/Makefile create mode 100644 kernel/fs/ceph/acl.c create mode 100644 kernel/fs/ceph/addr.c create mode 100644 kernel/fs/ceph/cache.c create mode 100644 kernel/fs/ceph/cache.h create mode 100644 kernel/fs/ceph/caps.c create mode 100644 kernel/fs/ceph/ceph_frag.c create mode 100644 kernel/fs/ceph/debugfs.c create mode 100644 kernel/fs/ceph/dir.c create mode 100644 kernel/fs/ceph/export.c create mode 100644 kernel/fs/ceph/file.c create mode 100644 kernel/fs/ceph/inode.c create mode 100644 kernel/fs/ceph/ioctl.c create mode 100644 kernel/fs/ceph/ioctl.h create mode 100644 kernel/fs/ceph/locks.c create mode 100644 kernel/fs/ceph/mds_client.c create mode 100644 kernel/fs/ceph/mds_client.h create mode 100644 kernel/fs/ceph/mdsmap.c create mode 100644 kernel/fs/ceph/snap.c create mode 100644 kernel/fs/ceph/strings.c create mode 100644 kernel/fs/ceph/super.c create mode 100644 kernel/fs/ceph/super.h create mode 100644 kernel/fs/ceph/xattr.c (limited to 'kernel/fs/ceph') diff --git a/kernel/fs/ceph/Kconfig b/kernel/fs/ceph/Kconfig new file mode 100644 index 000000000..264e9bf83 --- /dev/null +++ b/kernel/fs/ceph/Kconfig @@ -0,0 +1,40 @@ +config CEPH_FS + tristate "Ceph distributed file system" + depends on INET + select CEPH_LIB + select LIBCRC32C + select CRYPTO_AES + select CRYPTO + default n + help + Choose Y or M here to include support for mounting the + experimental Ceph distributed file system. Ceph is an extremely + scalable file system designed to provide high performance, + reliable access to petabytes of storage. + + More information at http://ceph.newdream.net/. + + If unsure, say N. + +if CEPH_FS +config CEPH_FSCACHE + bool "Enable Ceph client caching support" + depends on CEPH_FS=m && FSCACHE || CEPH_FS=y && FSCACHE=y + help + Choose Y here to enable persistent, read-only local + caching support for Ceph clients using FS-Cache + +endif + +config CEPH_FS_POSIX_ACL + bool "Ceph POSIX Access Control Lists" + depends on CEPH_FS + select FS_POSIX_ACL + help + POSIX Access Control Lists (ACLs) support permissions for users and + groups beyond the owner/group/world scheme. + + To learn more about Access Control Lists, visit the POSIX ACLs for + Linux website . + + If you don't know what Access Control Lists are, say N diff --git a/kernel/fs/ceph/Makefile b/kernel/fs/ceph/Makefile new file mode 100644 index 000000000..85a4230b9 --- /dev/null +++ b/kernel/fs/ceph/Makefile @@ -0,0 +1,13 @@ +# +# Makefile for CEPH filesystem. +# + +obj-$(CONFIG_CEPH_FS) += ceph.o + +ceph-y := super.o inode.o dir.o file.o locks.o addr.o ioctl.o \ + export.o caps.o snap.o xattr.o \ + mds_client.o mdsmap.o strings.o ceph_frag.o \ + debugfs.o + +ceph-$(CONFIG_CEPH_FSCACHE) += cache.o +ceph-$(CONFIG_CEPH_FS_POSIX_ACL) += acl.o diff --git a/kernel/fs/ceph/acl.c b/kernel/fs/ceph/acl.c new file mode 100644 index 000000000..64fa24834 --- /dev/null +++ b/kernel/fs/ceph/acl.c @@ -0,0 +1,263 @@ +/* + * linux/fs/ceph/acl.c + * + * Copyright (C) 2013 Guangliang Zhao, + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "super.h" + +static inline void ceph_set_cached_acl(struct inode *inode, + int type, struct posix_acl *acl) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + + spin_lock(&ci->i_ceph_lock); + if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)) + set_cached_acl(inode, type, acl); + spin_unlock(&ci->i_ceph_lock); +} + +struct posix_acl *ceph_get_acl(struct inode *inode, int type) +{ + int size; + const char *name; + char *value = NULL; + struct posix_acl *acl; + + switch (type) { + case ACL_TYPE_ACCESS: + name = POSIX_ACL_XATTR_ACCESS; + break; + case ACL_TYPE_DEFAULT: + name = POSIX_ACL_XATTR_DEFAULT; + break; + default: + BUG(); + } + + size = __ceph_getxattr(inode, name, "", 0); + if (size > 0) { + value = kzalloc(size, GFP_NOFS); + if (!value) + return ERR_PTR(-ENOMEM); + size = __ceph_getxattr(inode, name, value, size); + } + + if (size > 0) + acl = posix_acl_from_xattr(&init_user_ns, value, size); + else if (size == -ERANGE || size == -ENODATA || size == 0) + acl = NULL; + else + acl = ERR_PTR(-EIO); + + kfree(value); + + if (!IS_ERR(acl)) + ceph_set_cached_acl(inode, type, acl); + + return acl; +} + +int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type) +{ + int ret = 0, size = 0; + const char *name = NULL; + char *value = NULL; + struct iattr newattrs; + umode_t new_mode = inode->i_mode, old_mode = inode->i_mode; + struct dentry *dentry; + + switch (type) { + case ACL_TYPE_ACCESS: + name = POSIX_ACL_XATTR_ACCESS; + if (acl) { + ret = posix_acl_equiv_mode(acl, &new_mode); + if (ret < 0) + goto out; + if (ret == 0) + acl = NULL; + } + break; + case ACL_TYPE_DEFAULT: + if (!S_ISDIR(inode->i_mode)) { + ret = acl ? -EINVAL : 0; + goto out; + } + name = POSIX_ACL_XATTR_DEFAULT; + break; + default: + ret = -EINVAL; + goto out; + } + + if (acl) { + size = posix_acl_xattr_size(acl->a_count); + value = kmalloc(size, GFP_NOFS); + if (!value) { + ret = -ENOMEM; + goto out; + } + + ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); + if (ret < 0) + goto out_free; + } + + dentry = d_find_alias(inode); + if (new_mode != old_mode) { + newattrs.ia_mode = new_mode; + newattrs.ia_valid = ATTR_MODE; + ret = ceph_setattr(dentry, &newattrs); + if (ret) + goto out_dput; + } + + ret = __ceph_setxattr(dentry, name, value, size, 0); + if (ret) { + if (new_mode != old_mode) { + newattrs.ia_mode = old_mode; + newattrs.ia_valid = ATTR_MODE; + ceph_setattr(dentry, &newattrs); + } + goto out_dput; + } + + ceph_set_cached_acl(inode, type, acl); + +out_dput: + dput(dentry); +out_free: + kfree(value); +out: + return ret; +} + +int ceph_pre_init_acls(struct inode *dir, umode_t *mode, + struct ceph_acls_info *info) +{ + struct posix_acl *acl, *default_acl; + size_t val_size1 = 0, val_size2 = 0; + struct ceph_pagelist *pagelist = NULL; + void *tmp_buf = NULL; + int err; + + err = posix_acl_create(dir, mode, &default_acl, &acl); + if (err) + return err; + + if (acl) { + int ret = posix_acl_equiv_mode(acl, mode); + if (ret < 0) + goto out_err; + if (ret == 0) { + posix_acl_release(acl); + acl = NULL; + } + } + + if (!default_acl && !acl) + return 0; + + if (acl) + val_size1 = posix_acl_xattr_size(acl->a_count); + if (default_acl) + val_size2 = posix_acl_xattr_size(default_acl->a_count); + + err = -ENOMEM; + tmp_buf = kmalloc(max(val_size1, val_size2), GFP_NOFS); + if (!tmp_buf) + goto out_err; + pagelist = kmalloc(sizeof(struct ceph_pagelist), GFP_NOFS); + if (!pagelist) + goto out_err; + ceph_pagelist_init(pagelist); + + err = ceph_pagelist_reserve(pagelist, PAGE_SIZE); + if (err) + goto out_err; + + ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1); + + if (acl) { + size_t len = strlen(POSIX_ACL_XATTR_ACCESS); + err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8); + if (err) + goto out_err; + ceph_pagelist_encode_string(pagelist, POSIX_ACL_XATTR_ACCESS, + len); + err = posix_acl_to_xattr(&init_user_ns, acl, + tmp_buf, val_size1); + if (err < 0) + goto out_err; + ceph_pagelist_encode_32(pagelist, val_size1); + ceph_pagelist_append(pagelist, tmp_buf, val_size1); + } + if (default_acl) { + size_t len = strlen(POSIX_ACL_XATTR_DEFAULT); + err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8); + if (err) + goto out_err; + err = ceph_pagelist_encode_string(pagelist, + POSIX_ACL_XATTR_DEFAULT, len); + err = posix_acl_to_xattr(&init_user_ns, default_acl, + tmp_buf, val_size2); + if (err < 0) + goto out_err; + ceph_pagelist_encode_32(pagelist, val_size2); + ceph_pagelist_append(pagelist, tmp_buf, val_size2); + } + + kfree(tmp_buf); + + info->acl = acl; + info->default_acl = default_acl; + info->pagelist = pagelist; + return 0; + +out_err: + posix_acl_release(acl); + posix_acl_release(default_acl); + kfree(tmp_buf); + if (pagelist) + ceph_pagelist_release(pagelist); + return err; +} + +void ceph_init_inode_acls(struct inode* inode, struct ceph_acls_info *info) +{ + if (!inode) + return; + ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, info->acl); + ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, info->default_acl); +} + +void ceph_release_acls_info(struct ceph_acls_info *info) +{ + posix_acl_release(info->acl); + posix_acl_release(info->default_acl); + if (info->pagelist) + ceph_pagelist_release(info->pagelist); +} diff --git a/kernel/fs/ceph/addr.c b/kernel/fs/ceph/addr.c new file mode 100644 index 000000000..e162bcd10 --- /dev/null +++ b/kernel/fs/ceph/addr.c @@ -0,0 +1,1599 @@ +#include + +#include +#include +#include +#include +#include /* generic_writepages */ +#include +#include +#include + +#include "super.h" +#include "mds_client.h" +#include "cache.h" +#include + +/* + * Ceph address space ops. + * + * There are a few funny things going on here. + * + * The page->private field is used to reference a struct + * ceph_snap_context for _every_ dirty page. This indicates which + * snapshot the page was logically dirtied in, and thus which snap + * context needs to be associated with the osd write during writeback. + * + * Similarly, struct ceph_inode_info maintains a set of counters to + * count dirty pages on the inode. In the absence of snapshots, + * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. + * + * When a snapshot is taken (that is, when the client receives + * notification that a snapshot was taken), each inode with caps and + * with dirty pages (dirty pages implies there is a cap) gets a new + * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending + * order, new snaps go to the tail). The i_wrbuffer_ref_head count is + * moved to capsnap->dirty. (Unless a sync write is currently in + * progress. In that case, the capsnap is said to be "pending", new + * writes cannot start, and the capsnap isn't "finalized" until the + * write completes (or fails) and a final size/mtime for the inode for + * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. + * + * On writeback, we must submit writes to the osd IN SNAP ORDER. So, + * we look for the first capsnap in i_cap_snaps and write out pages in + * that snap context _only_. Then we move on to the next capsnap, + * eventually reaching the "live" or "head" context (i.e., pages that + * are not yet snapped) and are writing the most recently dirtied + * pages. + * + * Invalidate and so forth must take care to ensure the dirty page + * accounting is preserved. + */ + +#define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) +#define CONGESTION_OFF_THRESH(congestion_kb) \ + (CONGESTION_ON_THRESH(congestion_kb) - \ + (CONGESTION_ON_THRESH(congestion_kb) >> 2)) + +static inline struct ceph_snap_context *page_snap_context(struct page *page) +{ + if (PagePrivate(page)) + return (void *)page->private; + return NULL; +} + +/* + * Dirty a page. Optimistically adjust accounting, on the assumption + * that we won't race with invalidate. If we do, readjust. + */ +static int ceph_set_page_dirty(struct page *page) +{ + struct address_space *mapping = page->mapping; + struct inode *inode; + struct ceph_inode_info *ci; + struct ceph_snap_context *snapc; + int ret; + + if (unlikely(!mapping)) + return !TestSetPageDirty(page); + + if (PageDirty(page)) { + dout("%p set_page_dirty %p idx %lu -- already dirty\n", + mapping->host, page, page->index); + BUG_ON(!PagePrivate(page)); + return 0; + } + + inode = mapping->host; + ci = ceph_inode(inode); + + /* + * Note that we're grabbing a snapc ref here without holding + * any locks! + */ + snapc = ceph_get_snap_context(ci->i_snap_realm->cached_context); + + /* dirty the head */ + spin_lock(&ci->i_ceph_lock); + if (ci->i_head_snapc == NULL) + ci->i_head_snapc = ceph_get_snap_context(snapc); + ++ci->i_wrbuffer_ref_head; + if (ci->i_wrbuffer_ref == 0) + ihold(inode); + ++ci->i_wrbuffer_ref; + dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " + "snapc %p seq %lld (%d snaps)\n", + mapping->host, page, page->index, + ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, + ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, + snapc, snapc->seq, snapc->num_snaps); + spin_unlock(&ci->i_ceph_lock); + + /* + * Reference snap context in page->private. Also set + * PagePrivate so that we get invalidatepage callback. + */ + BUG_ON(PagePrivate(page)); + page->private = (unsigned long)snapc; + SetPagePrivate(page); + + ret = __set_page_dirty_nobuffers(page); + WARN_ON(!PageLocked(page)); + WARN_ON(!page->mapping); + + return ret; +} + +/* + * If we are truncating the full page (i.e. offset == 0), adjust the + * dirty page counters appropriately. Only called if there is private + * data on the page. + */ +static void ceph_invalidatepage(struct page *page, unsigned int offset, + unsigned int length) +{ + struct inode *inode; + struct ceph_inode_info *ci; + struct ceph_snap_context *snapc = page_snap_context(page); + + inode = page->mapping->host; + ci = ceph_inode(inode); + + if (offset != 0 || length != PAGE_CACHE_SIZE) { + dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", + inode, page, page->index, offset, length); + return; + } + + ceph_invalidate_fscache_page(inode, page); + + if (!PagePrivate(page)) + return; + + /* + * We can get non-dirty pages here due to races between + * set_page_dirty and truncate_complete_page; just spit out a + * warning, in case we end up with accounting problems later. + */ + if (!PageDirty(page)) + pr_err("%p invalidatepage %p page not dirty\n", inode, page); + + ClearPageChecked(page); + + dout("%p invalidatepage %p idx %lu full dirty page\n", + inode, page, page->index); + + ceph_put_wrbuffer_cap_refs(ci, 1, snapc); + ceph_put_snap_context(snapc); + page->private = 0; + ClearPagePrivate(page); +} + +static int ceph_releasepage(struct page *page, gfp_t g) +{ + struct inode *inode = page->mapping ? page->mapping->host : NULL; + dout("%p releasepage %p idx %lu\n", inode, page, page->index); + WARN_ON(PageDirty(page)); + + /* Can we release the page from the cache? */ + if (!ceph_release_fscache_page(page, g)) + return 0; + + return !PagePrivate(page); +} + +/* + * read a single page, without unlocking it. + */ +static int readpage_nounlock(struct file *filp, struct page *page) +{ + struct inode *inode = file_inode(filp); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_osd_client *osdc = + &ceph_inode_to_client(inode)->client->osdc; + int err = 0; + u64 off = page_offset(page); + u64 len = PAGE_CACHE_SIZE; + + if (off >= i_size_read(inode)) { + zero_user_segment(page, 0, PAGE_CACHE_SIZE); + SetPageUptodate(page); + return 0; + } + + if (ci->i_inline_version != CEPH_INLINE_NONE) { + /* + * Uptodate inline data should have been added + * into page cache while getting Fcr caps. + */ + if (off == 0) + return -EINVAL; + zero_user_segment(page, 0, PAGE_CACHE_SIZE); + SetPageUptodate(page); + return 0; + } + + err = ceph_readpage_from_fscache(inode, page); + if (err == 0) + goto out; + + dout("readpage inode %p file %p page %p index %lu\n", + inode, filp, page, page->index); + err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, + off, &len, + ci->i_truncate_seq, ci->i_truncate_size, + &page, 1, 0); + if (err == -ENOENT) + err = 0; + if (err < 0) { + SetPageError(page); + ceph_fscache_readpage_cancel(inode, page); + goto out; + } + if (err < PAGE_CACHE_SIZE) + /* zero fill remainder of page */ + zero_user_segment(page, err, PAGE_CACHE_SIZE); + else + flush_dcache_page(page); + + SetPageUptodate(page); + ceph_readpage_to_fscache(inode, page); + +out: + return err < 0 ? err : 0; +} + +static int ceph_readpage(struct file *filp, struct page *page) +{ + int r = readpage_nounlock(filp, page); + unlock_page(page); + return r; +} + +/* + * Finish an async read(ahead) op. + */ +static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg) +{ + struct inode *inode = req->r_inode; + struct ceph_osd_data *osd_data; + int rc = req->r_result; + int bytes = le32_to_cpu(msg->hdr.data_len); + int num_pages; + int i; + + dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); + + /* unlock all pages, zeroing any data we didn't read */ + osd_data = osd_req_op_extent_osd_data(req, 0); + BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); + num_pages = calc_pages_for((u64)osd_data->alignment, + (u64)osd_data->length); + for (i = 0; i < num_pages; i++) { + struct page *page = osd_data->pages[i]; + + if (rc < 0) + goto unlock; + if (bytes < (int)PAGE_CACHE_SIZE) { + /* zero (remainder of) page */ + int s = bytes < 0 ? 0 : bytes; + zero_user_segment(page, s, PAGE_CACHE_SIZE); + } + dout("finish_read %p uptodate %p idx %lu\n", inode, page, + page->index); + flush_dcache_page(page); + SetPageUptodate(page); + ceph_readpage_to_fscache(inode, page); +unlock: + unlock_page(page); + page_cache_release(page); + bytes -= PAGE_CACHE_SIZE; + } + kfree(osd_data->pages); +} + +static void ceph_unlock_page_vector(struct page **pages, int num_pages) +{ + int i; + + for (i = 0; i < num_pages; i++) + unlock_page(pages[i]); +} + +/* + * start an async read(ahead) operation. return nr_pages we submitted + * a read for on success, or negative error code. + */ +static int start_read(struct inode *inode, struct list_head *page_list, int max) +{ + struct ceph_osd_client *osdc = + &ceph_inode_to_client(inode)->client->osdc; + struct ceph_inode_info *ci = ceph_inode(inode); + struct page *page = list_entry(page_list->prev, struct page, lru); + struct ceph_vino vino; + struct ceph_osd_request *req; + u64 off; + u64 len; + int i; + struct page **pages; + pgoff_t next_index; + int nr_pages = 0; + int ret; + + off = (u64) page_offset(page); + + /* count pages */ + next_index = page->index; + list_for_each_entry_reverse(page, page_list, lru) { + if (page->index != next_index) + break; + nr_pages++; + next_index++; + if (max && nr_pages == max) + break; + } + len = nr_pages << PAGE_CACHE_SHIFT; + dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, + off, len); + vino = ceph_vino(inode); + req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, + 0, 1, CEPH_OSD_OP_READ, + CEPH_OSD_FLAG_READ, NULL, + ci->i_truncate_seq, ci->i_truncate_size, + false); + if (IS_ERR(req)) + return PTR_ERR(req); + + /* build page vector */ + nr_pages = calc_pages_for(0, len); + pages = kmalloc(sizeof(*pages) * nr_pages, GFP_NOFS); + ret = -ENOMEM; + if (!pages) + goto out; + for (i = 0; i < nr_pages; ++i) { + page = list_entry(page_list->prev, struct page, lru); + BUG_ON(PageLocked(page)); + list_del(&page->lru); + + dout("start_read %p adding %p idx %lu\n", inode, page, + page->index); + if (add_to_page_cache_lru(page, &inode->i_data, page->index, + GFP_NOFS)) { + ceph_fscache_uncache_page(inode, page); + page_cache_release(page); + dout("start_read %p add_to_page_cache failed %p\n", + inode, page); + nr_pages = i; + goto out_pages; + } + pages[i] = page; + } + osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); + req->r_callback = finish_read; + req->r_inode = inode; + + ceph_osdc_build_request(req, off, NULL, vino.snap, NULL); + + dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); + ret = ceph_osdc_start_request(osdc, req, false); + if (ret < 0) + goto out_pages; + ceph_osdc_put_request(req); + return nr_pages; + +out_pages: + ceph_unlock_page_vector(pages, nr_pages); + ceph_release_page_vector(pages, nr_pages); +out: + ceph_osdc_put_request(req); + return ret; +} + + +/* + * Read multiple pages. Leave pages we don't read + unlock in page_list; + * the caller (VM) cleans them up. + */ +static int ceph_readpages(struct file *file, struct address_space *mapping, + struct list_head *page_list, unsigned nr_pages) +{ + struct inode *inode = file_inode(file); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + int rc = 0; + int max = 0; + + if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) + return -EINVAL; + + rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, + &nr_pages); + + if (rc == 0) + goto out; + + if (fsc->mount_options->rsize >= PAGE_CACHE_SIZE) + max = (fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1) + >> PAGE_SHIFT; + + dout("readpages %p file %p nr_pages %d max %d\n", inode, + file, nr_pages, + max); + while (!list_empty(page_list)) { + rc = start_read(inode, page_list, max); + if (rc < 0) + goto out; + BUG_ON(rc == 0); + } +out: + ceph_fscache_readpages_cancel(inode, page_list); + + dout("readpages %p file %p ret %d\n", inode, file, rc); + return rc; +} + +/* + * Get ref for the oldest snapc for an inode with dirty data... that is, the + * only snap context we are allowed to write back. + */ +static struct ceph_snap_context *get_oldest_context(struct inode *inode, + u64 *snap_size) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_snap_context *snapc = NULL; + struct ceph_cap_snap *capsnap = NULL; + + spin_lock(&ci->i_ceph_lock); + list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { + dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, + capsnap->context, capsnap->dirty_pages); + if (capsnap->dirty_pages) { + snapc = ceph_get_snap_context(capsnap->context); + if (snap_size) + *snap_size = capsnap->size; + break; + } + } + if (!snapc && ci->i_wrbuffer_ref_head) { + snapc = ceph_get_snap_context(ci->i_head_snapc); + dout(" head snapc %p has %d dirty pages\n", + snapc, ci->i_wrbuffer_ref_head); + } + spin_unlock(&ci->i_ceph_lock); + return snapc; +} + +/* + * Write a single page, but leave the page locked. + * + * If we get a write error, set the page error bit, but still adjust the + * dirty page accounting (i.e., page is no longer dirty). + */ +static int writepage_nounlock(struct page *page, struct writeback_control *wbc) +{ + struct inode *inode; + struct ceph_inode_info *ci; + struct ceph_fs_client *fsc; + struct ceph_osd_client *osdc; + struct ceph_snap_context *snapc, *oldest; + loff_t page_off = page_offset(page); + long writeback_stat; + u64 truncate_size, snap_size = 0; + u32 truncate_seq; + int err = 0, len = PAGE_CACHE_SIZE; + + dout("writepage %p idx %lu\n", page, page->index); + + if (!page->mapping || !page->mapping->host) { + dout("writepage %p - no mapping\n", page); + return -EFAULT; + } + inode = page->mapping->host; + ci = ceph_inode(inode); + fsc = ceph_inode_to_client(inode); + osdc = &fsc->client->osdc; + + /* verify this is a writeable snap context */ + snapc = page_snap_context(page); + if (snapc == NULL) { + dout("writepage %p page %p not dirty?\n", inode, page); + goto out; + } + oldest = get_oldest_context(inode, &snap_size); + if (snapc->seq > oldest->seq) { + dout("writepage %p page %p snapc %p not writeable - noop\n", + inode, page, snapc); + /* we should only noop if called by kswapd */ + WARN_ON((current->flags & PF_MEMALLOC) == 0); + ceph_put_snap_context(oldest); + goto out; + } + ceph_put_snap_context(oldest); + + spin_lock(&ci->i_ceph_lock); + truncate_seq = ci->i_truncate_seq; + truncate_size = ci->i_truncate_size; + if (!snap_size) + snap_size = i_size_read(inode); + spin_unlock(&ci->i_ceph_lock); + + /* is this a partial page at end of file? */ + if (page_off >= snap_size) { + dout("%p page eof %llu\n", page, snap_size); + goto out; + } + if (snap_size < page_off + len) + len = snap_size - page_off; + + dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", + inode, page, page->index, page_off, len, snapc); + + writeback_stat = atomic_long_inc_return(&fsc->writeback_count); + if (writeback_stat > + CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) + set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); + + ceph_readpage_to_fscache(inode, page); + + set_page_writeback(page); + err = ceph_osdc_writepages(osdc, ceph_vino(inode), + &ci->i_layout, snapc, + page_off, len, + truncate_seq, truncate_size, + &inode->i_mtime, &page, 1); + if (err < 0) { + dout("writepage setting page/mapping error %d %p\n", err, page); + SetPageError(page); + mapping_set_error(&inode->i_data, err); + if (wbc) + wbc->pages_skipped++; + } else { + dout("writepage cleaned page %p\n", page); + err = 0; /* vfs expects us to return 0 */ + } + page->private = 0; + ClearPagePrivate(page); + end_page_writeback(page); + ceph_put_wrbuffer_cap_refs(ci, 1, snapc); + ceph_put_snap_context(snapc); /* page's reference */ +out: + return err; +} + +static int ceph_writepage(struct page *page, struct writeback_control *wbc) +{ + int err; + struct inode *inode = page->mapping->host; + BUG_ON(!inode); + ihold(inode); + err = writepage_nounlock(page, wbc); + unlock_page(page); + iput(inode); + return err; +} + + +/* + * lame release_pages helper. release_pages() isn't exported to + * modules. + */ +static void ceph_release_pages(struct page **pages, int num) +{ + struct pagevec pvec; + int i; + + pagevec_init(&pvec, 0); + for (i = 0; i < num; i++) { + if (pagevec_add(&pvec, pages[i]) == 0) + pagevec_release(&pvec); + } + pagevec_release(&pvec); +} + +/* + * async writeback completion handler. + * + * If we get an error, set the mapping error bit, but not the individual + * page error bits. + */ +static void writepages_finish(struct ceph_osd_request *req, + struct ceph_msg *msg) +{ + struct inode *inode = req->r_inode; + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_osd_data *osd_data; + unsigned wrote; + struct page *page; + int num_pages; + int i; + struct ceph_snap_context *snapc = req->r_snapc; + struct address_space *mapping = inode->i_mapping; + int rc = req->r_result; + u64 bytes = req->r_ops[0].extent.length; + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + long writeback_stat; + unsigned issued = ceph_caps_issued(ci); + + osd_data = osd_req_op_extent_osd_data(req, 0); + BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); + num_pages = calc_pages_for((u64)osd_data->alignment, + (u64)osd_data->length); + if (rc >= 0) { + /* + * Assume we wrote the pages we originally sent. The + * osd might reply with fewer pages if our writeback + * raced with a truncation and was adjusted at the osd, + * so don't believe the reply. + */ + wrote = num_pages; + } else { + wrote = 0; + mapping_set_error(mapping, rc); + } + dout("writepages_finish %p rc %d bytes %llu wrote %d (pages)\n", + inode, rc, bytes, wrote); + + /* clean all pages */ + for (i = 0; i < num_pages; i++) { + page = osd_data->pages[i]; + BUG_ON(!page); + WARN_ON(!PageUptodate(page)); + + writeback_stat = + atomic_long_dec_return(&fsc->writeback_count); + if (writeback_stat < + CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) + clear_bdi_congested(&fsc->backing_dev_info, + BLK_RW_ASYNC); + + ceph_put_snap_context(page_snap_context(page)); + page->private = 0; + ClearPagePrivate(page); + dout("unlocking %d %p\n", i, page); + end_page_writeback(page); + + /* + * We lost the cache cap, need to truncate the page before + * it is unlocked, otherwise we'd truncate it later in the + * page truncation thread, possibly losing some data that + * raced its way in + */ + if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) + generic_error_remove_page(inode->i_mapping, page); + + unlock_page(page); + } + dout("%p wrote+cleaned %d pages\n", inode, wrote); + ceph_put_wrbuffer_cap_refs(ci, num_pages, snapc); + + ceph_release_pages(osd_data->pages, num_pages); + if (osd_data->pages_from_pool) + mempool_free(osd_data->pages, + ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); + else + kfree(osd_data->pages); + ceph_osdc_put_request(req); +} + +/* + * initiate async writeback + */ +static int ceph_writepages_start(struct address_space *mapping, + struct writeback_control *wbc) +{ + struct inode *inode = mapping->host; + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_vino vino = ceph_vino(inode); + pgoff_t index, start, end; + int range_whole = 0; + int should_loop = 1; + pgoff_t max_pages = 0, max_pages_ever = 0; + struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; + struct pagevec pvec; + int done = 0; + int rc = 0; + unsigned wsize = 1 << inode->i_blkbits; + struct ceph_osd_request *req = NULL; + int do_sync = 0; + u64 truncate_size, snap_size; + u32 truncate_seq; + + /* + * Include a 'sync' in the OSD request if this is a data + * integrity write (e.g., O_SYNC write or fsync()), or if our + * cap is being revoked. + */ + if ((wbc->sync_mode == WB_SYNC_ALL) || + ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) + do_sync = 1; + dout("writepages_start %p dosync=%d (mode=%s)\n", + inode, do_sync, + wbc->sync_mode == WB_SYNC_NONE ? "NONE" : + (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); + + if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) { + pr_warn("writepage_start %p on forced umount\n", inode); + return -EIO; /* we're in a forced umount, don't write! */ + } + if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) + wsize = fsc->mount_options->wsize; + if (wsize < PAGE_CACHE_SIZE) + wsize = PAGE_CACHE_SIZE; + max_pages_ever = wsize >> PAGE_CACHE_SHIFT; + + pagevec_init(&pvec, 0); + + /* where to start/end? */ + if (wbc->range_cyclic) { + start = mapping->writeback_index; /* Start from prev offset */ + end = -1; + dout(" cyclic, start at %lu\n", start); + } else { + start = wbc->range_start >> PAGE_CACHE_SHIFT; + end = wbc->range_end >> PAGE_CACHE_SHIFT; + if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) + range_whole = 1; + should_loop = 0; + dout(" not cyclic, %lu to %lu\n", start, end); + } + index = start; + +retry: + /* find oldest snap context with dirty data */ + ceph_put_snap_context(snapc); + snap_size = 0; + snapc = get_oldest_context(inode, &snap_size); + if (!snapc) { + /* hmm, why does writepages get called when there + is no dirty data? */ + dout(" no snap context with dirty data?\n"); + goto out; + } + if (snap_size == 0) + snap_size = i_size_read(inode); + dout(" oldest snapc is %p seq %lld (%d snaps)\n", + snapc, snapc->seq, snapc->num_snaps); + + spin_lock(&ci->i_ceph_lock); + truncate_seq = ci->i_truncate_seq; + truncate_size = ci->i_truncate_size; + if (!snap_size) + snap_size = i_size_read(inode); + spin_unlock(&ci->i_ceph_lock); + + if (last_snapc && snapc != last_snapc) { + /* if we switched to a newer snapc, restart our scan at the + * start of the original file range. */ + dout(" snapc differs from last pass, restarting at %lu\n", + index); + index = start; + } + last_snapc = snapc; + + while (!done && index <= end) { + unsigned i; + int first; + pgoff_t next; + int pvec_pages, locked_pages; + struct page **pages = NULL; + mempool_t *pool = NULL; /* Becomes non-null if mempool used */ + struct page *page; + int want; + u64 offset, len; + long writeback_stat; + + next = 0; + locked_pages = 0; + max_pages = max_pages_ever; + +get_more_pages: + first = -1; + want = min(end - index, + min((pgoff_t)PAGEVEC_SIZE, + max_pages - (pgoff_t)locked_pages) - 1) + + 1; + pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, + PAGECACHE_TAG_DIRTY, + want); + dout("pagevec_lookup_tag got %d\n", pvec_pages); + if (!pvec_pages && !locked_pages) + break; + for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { + page = pvec.pages[i]; + dout("? %p idx %lu\n", page, page->index); + if (locked_pages == 0) + lock_page(page); /* first page */ + else if (!trylock_page(page)) + break; + + /* only dirty pages, or our accounting breaks */ + if (unlikely(!PageDirty(page)) || + unlikely(page->mapping != mapping)) { + dout("!dirty or !mapping %p\n", page); + unlock_page(page); + break; + } + if (!wbc->range_cyclic && page->index > end) { + dout("end of range %p\n", page); + done = 1; + unlock_page(page); + break; + } + if (next && (page->index != next)) { + dout("not consecutive %p\n", page); + unlock_page(page); + break; + } + if (wbc->sync_mode != WB_SYNC_NONE) { + dout("waiting on writeback %p\n", page); + wait_on_page_writeback(page); + } + if (page_offset(page) >= snap_size) { + dout("%p page eof %llu\n", page, snap_size); + done = 1; + unlock_page(page); + break; + } + if (PageWriteback(page)) { + dout("%p under writeback\n", page); + unlock_page(page); + break; + } + + /* only if matching snap context */ + pgsnapc = page_snap_context(page); + if (pgsnapc->seq > snapc->seq) { + dout("page snapc %p %lld > oldest %p %lld\n", + pgsnapc, pgsnapc->seq, snapc, snapc->seq); + unlock_page(page); + if (!locked_pages) + continue; /* keep looking for snap */ + break; + } + + if (!clear_page_dirty_for_io(page)) { + dout("%p !clear_page_dirty_for_io\n", page); + unlock_page(page); + break; + } + + /* + * We have something to write. If this is + * the first locked page this time through, + * allocate an osd request and a page array + * that it will use. + */ + if (locked_pages == 0) { + BUG_ON(pages); + /* prepare async write request */ + offset = (u64)page_offset(page); + len = wsize; + req = ceph_osdc_new_request(&fsc->client->osdc, + &ci->i_layout, vino, + offset, &len, 0, + do_sync ? 2 : 1, + CEPH_OSD_OP_WRITE, + CEPH_OSD_FLAG_WRITE | + CEPH_OSD_FLAG_ONDISK, + snapc, truncate_seq, + truncate_size, true); + if (IS_ERR(req)) { + rc = PTR_ERR(req); + unlock_page(page); + break; + } + + if (do_sync) + osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC); + + req->r_callback = writepages_finish; + req->r_inode = inode; + + max_pages = calc_pages_for(0, (u64)len); + pages = kmalloc(max_pages * sizeof (*pages), + GFP_NOFS); + if (!pages) { + pool = fsc->wb_pagevec_pool; + pages = mempool_alloc(pool, GFP_NOFS); + BUG_ON(!pages); + } + } + + /* note position of first page in pvec */ + if (first < 0) + first = i; + dout("%p will write page %p idx %lu\n", + inode, page, page->index); + + writeback_stat = + atomic_long_inc_return(&fsc->writeback_count); + if (writeback_stat > CONGESTION_ON_THRESH( + fsc->mount_options->congestion_kb)) { + set_bdi_congested(&fsc->backing_dev_info, + BLK_RW_ASYNC); + } + + set_page_writeback(page); + pages[locked_pages] = page; + locked_pages++; + next = page->index + 1; + } + + /* did we get anything? */ + if (!locked_pages) + goto release_pvec_pages; + if (i) { + int j; + BUG_ON(!locked_pages || first < 0); + + if (pvec_pages && i == pvec_pages && + locked_pages < max_pages) { + dout("reached end pvec, trying for more\n"); + pagevec_reinit(&pvec); + goto get_more_pages; + } + + /* shift unused pages over in the pvec... we + * will need to release them below. */ + for (j = i; j < pvec_pages; j++) { + dout(" pvec leftover page %p\n", + pvec.pages[j]); + pvec.pages[j-i+first] = pvec.pages[j]; + } + pvec.nr -= i-first; + } + + /* Format the osd request message and submit the write */ + + offset = page_offset(pages[0]); + len = min(snap_size - offset, + (u64)locked_pages << PAGE_CACHE_SHIFT); + dout("writepages got %d pages at %llu~%llu\n", + locked_pages, offset, len); + + osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, + !!pool, false); + + pages = NULL; /* request message now owns the pages array */ + pool = NULL; + + /* Update the write op length in case we changed it */ + + osd_req_op_extent_update(req, 0, len); + + vino = ceph_vino(inode); + ceph_osdc_build_request(req, offset, snapc, vino.snap, + &inode->i_mtime); + + rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); + BUG_ON(rc); + req = NULL; + + /* continue? */ + index = next; + wbc->nr_to_write -= locked_pages; + if (wbc->nr_to_write <= 0) + done = 1; + +release_pvec_pages: + dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, + pvec.nr ? pvec.pages[0] : NULL); + pagevec_release(&pvec); + + if (locked_pages && !done) + goto retry; + } + + if (should_loop && !done) { + /* more to do; loop back to beginning of file */ + dout("writepages looping back to beginning of file\n"); + should_loop = 0; + index = 0; + goto retry; + } + + if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) + mapping->writeback_index = index; + +out: + if (req) + ceph_osdc_put_request(req); + ceph_put_snap_context(snapc); + dout("writepages done, rc = %d\n", rc); + return rc; +} + + + +/* + * See if a given @snapc is either writeable, or already written. + */ +static int context_is_writeable_or_written(struct inode *inode, + struct ceph_snap_context *snapc) +{ + struct ceph_snap_context *oldest = get_oldest_context(inode, NULL); + int ret = !oldest || snapc->seq <= oldest->seq; + + ceph_put_snap_context(oldest); + return ret; +} + +/* + * We are only allowed to write into/dirty the page if the page is + * clean, or already dirty within the same snap context. + * + * called with page locked. + * return success with page locked, + * or any failure (incl -EAGAIN) with page unlocked. + */ +static int ceph_update_writeable_page(struct file *file, + loff_t pos, unsigned len, + struct page *page) +{ + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; + loff_t page_off = pos & PAGE_CACHE_MASK; + int pos_in_page = pos & ~PAGE_CACHE_MASK; + int end_in_page = pos_in_page + len; + loff_t i_size; + int r; + struct ceph_snap_context *snapc, *oldest; + +retry_locked: + /* writepages currently holds page lock, but if we change that later, */ + wait_on_page_writeback(page); + + /* check snap context */ + BUG_ON(!ci->i_snap_realm); + down_read(&mdsc->snap_rwsem); + BUG_ON(!ci->i_snap_realm->cached_context); + snapc = page_snap_context(page); + if (snapc && snapc != ci->i_head_snapc) { + /* + * this page is already dirty in another (older) snap + * context! is it writeable now? + */ + oldest = get_oldest_context(inode, NULL); + up_read(&mdsc->snap_rwsem); + + if (snapc->seq > oldest->seq) { + ceph_put_snap_context(oldest); + dout(" page %p snapc %p not current or oldest\n", + page, snapc); + /* + * queue for writeback, and wait for snapc to + * be writeable or written + */ + snapc = ceph_get_snap_context(snapc); + unlock_page(page); + ceph_queue_writeback(inode); + r = wait_event_interruptible(ci->i_cap_wq, + context_is_writeable_or_written(inode, snapc)); + ceph_put_snap_context(snapc); + if (r == -ERESTARTSYS) + return r; + return -EAGAIN; + } + ceph_put_snap_context(oldest); + + /* yay, writeable, do it now (without dropping page lock) */ + dout(" page %p snapc %p not current, but oldest\n", + page, snapc); + if (!clear_page_dirty_for_io(page)) + goto retry_locked; + r = writepage_nounlock(page, NULL); + if (r < 0) + goto fail_nosnap; + goto retry_locked; + } + + if (PageUptodate(page)) { + dout(" page %p already uptodate\n", page); + return 0; + } + + /* full page? */ + if (pos_in_page == 0 && len == PAGE_CACHE_SIZE) + return 0; + + /* past end of file? */ + i_size = inode->i_size; /* caller holds i_mutex */ + + if (page_off >= i_size || + (pos_in_page == 0 && (pos+len) >= i_size && + end_in_page - pos_in_page != PAGE_CACHE_SIZE)) { + dout(" zeroing %p 0 - %d and %d - %d\n", + page, pos_in_page, end_in_page, (int)PAGE_CACHE_SIZE); + zero_user_segments(page, + 0, pos_in_page, + end_in_page, PAGE_CACHE_SIZE); + return 0; + } + + /* we need to read it. */ + up_read(&mdsc->snap_rwsem); + r = readpage_nounlock(file, page); + if (r < 0) + goto fail_nosnap; + goto retry_locked; +fail_nosnap: + unlock_page(page); + return r; +} + +/* + * We are only allowed to write into/dirty the page if the page is + * clean, or already dirty within the same snap context. + */ +static int ceph_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) +{ + struct inode *inode = file_inode(file); + struct page *page; + pgoff_t index = pos >> PAGE_CACHE_SHIFT; + int r; + + do { + /* get a page */ + page = grab_cache_page_write_begin(mapping, index, 0); + if (!page) + return -ENOMEM; + *pagep = page; + + dout("write_begin file %p inode %p page %p %d~%d\n", file, + inode, page, (int)pos, (int)len); + + r = ceph_update_writeable_page(file, pos, len, page); + if (r < 0) + page_cache_release(page); + else + *pagep = page; + } while (r == -EAGAIN); + + return r; +} + +/* + * we don't do anything in here that simple_write_end doesn't do + * except adjust dirty page accounting and drop read lock on + * mdsc->snap_rwsem. + */ +static int ceph_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + struct inode *inode = file_inode(file); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_mds_client *mdsc = fsc->mdsc; + unsigned from = pos & (PAGE_CACHE_SIZE - 1); + int check_cap = 0; + + dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, + inode, page, (int)pos, (int)copied, (int)len); + + /* zero the stale part of the page if we did a short copy */ + if (copied < len) + zero_user_segment(page, from+copied, len); + + /* did file size increase? */ + /* (no need for i_size_read(); we caller holds i_mutex */ + if (pos+copied > inode->i_size) + check_cap = ceph_inode_set_size(inode, pos+copied); + + if (!PageUptodate(page)) + SetPageUptodate(page); + + set_page_dirty(page); + + unlock_page(page); + up_read(&mdsc->snap_rwsem); + page_cache_release(page); + + if (check_cap) + ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); + + return copied; +} + +/* + * we set .direct_IO to indicate direct io is supported, but since we + * intercept O_DIRECT reads and writes early, this function should + * never get called. + */ +static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter, + loff_t pos) +{ + WARN_ON(1); + return -EINVAL; +} + +const struct address_space_operations ceph_aops = { + .readpage = ceph_readpage, + .readpages = ceph_readpages, + .writepage = ceph_writepage, + .writepages = ceph_writepages_start, + .write_begin = ceph_write_begin, + .write_end = ceph_write_end, + .set_page_dirty = ceph_set_page_dirty, + .invalidatepage = ceph_invalidatepage, + .releasepage = ceph_releasepage, + .direct_IO = ceph_direct_io, +}; + + +/* + * vm ops + */ +static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct inode *inode = file_inode(vma->vm_file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_file_info *fi = vma->vm_file->private_data; + struct page *pinned_page = NULL; + loff_t off = vmf->pgoff << PAGE_CACHE_SHIFT; + int want, got, ret; + + dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", + inode, ceph_vinop(inode), off, (size_t)PAGE_CACHE_SIZE); + if (fi->fmode & CEPH_FILE_MODE_LAZY) + want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; + else + want = CEPH_CAP_FILE_CACHE; + while (1) { + got = 0; + ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, + -1, &got, &pinned_page); + if (ret == 0) + break; + if (ret != -ERESTARTSYS) { + WARN_ON(1); + return VM_FAULT_SIGBUS; + } + } + dout("filemap_fault %p %llu~%zd got cap refs on %s\n", + inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got)); + + if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || + ci->i_inline_version == CEPH_INLINE_NONE) + ret = filemap_fault(vma, vmf); + else + ret = -EAGAIN; + + dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", + inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got), ret); + if (pinned_page) + page_cache_release(pinned_page); + ceph_put_cap_refs(ci, got); + + if (ret != -EAGAIN) + return ret; + + /* read inline data */ + if (off >= PAGE_CACHE_SIZE) { + /* does not support inline data > PAGE_SIZE */ + ret = VM_FAULT_SIGBUS; + } else { + int ret1; + struct address_space *mapping = inode->i_mapping; + struct page *page = find_or_create_page(mapping, 0, + mapping_gfp_mask(mapping) & + ~__GFP_FS); + if (!page) { + ret = VM_FAULT_OOM; + goto out; + } + ret1 = __ceph_do_getattr(inode, page, + CEPH_STAT_CAP_INLINE_DATA, true); + if (ret1 < 0 || off >= i_size_read(inode)) { + unlock_page(page); + page_cache_release(page); + ret = VM_FAULT_SIGBUS; + goto out; + } + if (ret1 < PAGE_CACHE_SIZE) + zero_user_segment(page, ret1, PAGE_CACHE_SIZE); + else + flush_dcache_page(page); + SetPageUptodate(page); + vmf->page = page; + ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; + } +out: + dout("filemap_fault %p %llu~%zd read inline data ret %d\n", + inode, off, (size_t)PAGE_CACHE_SIZE, ret); + return ret; +} + +/* + * Reuse write_begin here for simplicity. + */ +static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct inode *inode = file_inode(vma->vm_file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_file_info *fi = vma->vm_file->private_data; + struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; + struct page *page = vmf->page; + loff_t off = page_offset(page); + loff_t size = i_size_read(inode); + size_t len; + int want, got, ret; + + if (ci->i_inline_version != CEPH_INLINE_NONE) { + struct page *locked_page = NULL; + if (off == 0) { + lock_page(page); + locked_page = page; + } + ret = ceph_uninline_data(vma->vm_file, locked_page); + if (locked_page) + unlock_page(locked_page); + if (ret < 0) + return VM_FAULT_SIGBUS; + } + + if (off + PAGE_CACHE_SIZE <= size) + len = PAGE_CACHE_SIZE; + else + len = size & ~PAGE_CACHE_MASK; + + dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", + inode, ceph_vinop(inode), off, len, size); + if (fi->fmode & CEPH_FILE_MODE_LAZY) + want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; + else + want = CEPH_CAP_FILE_BUFFER; + while (1) { + got = 0; + ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, + &got, NULL); + if (ret == 0) + break; + if (ret != -ERESTARTSYS) { + WARN_ON(1); + return VM_FAULT_SIGBUS; + } + } + dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", + inode, off, len, ceph_cap_string(got)); + + /* Update time before taking page lock */ + file_update_time(vma->vm_file); + + lock_page(page); + + ret = VM_FAULT_NOPAGE; + if ((off > size) || + (page->mapping != inode->i_mapping)) + goto out; + + ret = ceph_update_writeable_page(vma->vm_file, off, len, page); + if (ret == 0) { + /* success. we'll keep the page locked. */ + set_page_dirty(page); + up_read(&mdsc->snap_rwsem); + ret = VM_FAULT_LOCKED; + } else { + if (ret == -ENOMEM) + ret = VM_FAULT_OOM; + else + ret = VM_FAULT_SIGBUS; + } +out: + if (ret != VM_FAULT_LOCKED) + unlock_page(page); + if (ret == VM_FAULT_LOCKED || + ci->i_inline_version != CEPH_INLINE_NONE) { + int dirty; + spin_lock(&ci->i_ceph_lock); + ci->i_inline_version = CEPH_INLINE_NONE; + dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); + spin_unlock(&ci->i_ceph_lock); + if (dirty) + __mark_inode_dirty(inode, dirty); + } + + dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", + inode, off, len, ceph_cap_string(got), ret); + ceph_put_cap_refs(ci, got); + + return ret; +} + +void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, + char *data, size_t len) +{ + struct address_space *mapping = inode->i_mapping; + struct page *page; + + if (locked_page) { + page = locked_page; + } else { + if (i_size_read(inode) == 0) + return; + page = find_or_create_page(mapping, 0, + mapping_gfp_mask(mapping) & ~__GFP_FS); + if (!page) + return; + if (PageUptodate(page)) { + unlock_page(page); + page_cache_release(page); + return; + } + } + + dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", + inode, ceph_vinop(inode), len, locked_page); + + if (len > 0) { + void *kaddr = kmap_atomic(page); + memcpy(kaddr, data, len); + kunmap_atomic(kaddr); + } + + if (page != locked_page) { + if (len < PAGE_CACHE_SIZE) + zero_user_segment(page, len, PAGE_CACHE_SIZE); + else + flush_dcache_page(page); + + SetPageUptodate(page); + unlock_page(page); + page_cache_release(page); + } +} + +int ceph_uninline_data(struct file *filp, struct page *locked_page) +{ + struct inode *inode = file_inode(filp); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_osd_request *req; + struct page *page = NULL; + u64 len, inline_version; + int err = 0; + bool from_pagecache = false; + + spin_lock(&ci->i_ceph_lock); + inline_version = ci->i_inline_version; + spin_unlock(&ci->i_ceph_lock); + + dout("uninline_data %p %llx.%llx inline_version %llu\n", + inode, ceph_vinop(inode), inline_version); + + if (inline_version == 1 || /* initial version, no data */ + inline_version == CEPH_INLINE_NONE) + goto out; + + if (locked_page) { + page = locked_page; + WARN_ON(!PageUptodate(page)); + } else if (ceph_caps_issued(ci) & + (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { + page = find_get_page(inode->i_mapping, 0); + if (page) { + if (PageUptodate(page)) { + from_pagecache = true; + lock_page(page); + } else { + page_cache_release(page); + page = NULL; + } + } + } + + if (page) { + len = i_size_read(inode); + if (len > PAGE_CACHE_SIZE) + len = PAGE_CACHE_SIZE; + } else { + page = __page_cache_alloc(GFP_NOFS); + if (!page) { + err = -ENOMEM; + goto out; + } + err = __ceph_do_getattr(inode, page, + CEPH_STAT_CAP_INLINE_DATA, true); + if (err < 0) { + /* no inline data */ + if (err == -ENODATA) + err = 0; + goto out; + } + len = err; + } + + req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, + ceph_vino(inode), 0, &len, 0, 1, + CEPH_OSD_OP_CREATE, + CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, + ci->i_snap_realm->cached_context, + 0, 0, false); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + + ceph_osdc_build_request(req, 0, NULL, CEPH_NOSNAP, &inode->i_mtime); + err = ceph_osdc_start_request(&fsc->client->osdc, req, false); + if (!err) + err = ceph_osdc_wait_request(&fsc->client->osdc, req); + ceph_osdc_put_request(req); + if (err < 0) + goto out; + + req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, + ceph_vino(inode), 0, &len, 1, 3, + CEPH_OSD_OP_WRITE, + CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, + ci->i_snap_realm->cached_context, + ci->i_truncate_seq, ci->i_truncate_size, + false); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + + osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); + + { + __le64 xattr_buf = cpu_to_le64(inline_version); + err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, + "inline_version", &xattr_buf, + sizeof(xattr_buf), + CEPH_OSD_CMPXATTR_OP_GT, + CEPH_OSD_CMPXATTR_MODE_U64); + if (err) + goto out_put; + } + + { + char xattr_buf[32]; + int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), + "%llu", inline_version); + err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, + "inline_version", + xattr_buf, xattr_len, 0, 0); + if (err) + goto out_put; + } + + ceph_osdc_build_request(req, 0, NULL, CEPH_NOSNAP, &inode->i_mtime); + err = ceph_osdc_start_request(&fsc->client->osdc, req, false); + if (!err) + err = ceph_osdc_wait_request(&fsc->client->osdc, req); +out_put: + ceph_osdc_put_request(req); + if (err == -ECANCELED) + err = 0; +out: + if (page && page != locked_page) { + if (from_pagecache) { + unlock_page(page); + page_cache_release(page); + } else + __free_pages(page, 0); + } + + dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", + inode, ceph_vinop(inode), inline_version, err); + return err; +} + +static struct vm_operations_struct ceph_vmops = { + .fault = ceph_filemap_fault, + .page_mkwrite = ceph_page_mkwrite, +}; + +int ceph_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct address_space *mapping = file->f_mapping; + + if (!mapping->a_ops->readpage) + return -ENOEXEC; + file_accessed(file); + vma->vm_ops = &ceph_vmops; + return 0; +} diff --git a/kernel/fs/ceph/cache.c b/kernel/fs/ceph/cache.c new file mode 100644 index 000000000..834f9f372 --- /dev/null +++ b/kernel/fs/ceph/cache.c @@ -0,0 +1,402 @@ +/* + * Ceph cache definitions. + * + * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. + * Written by Milosz Tanski (milosz@adfin.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to: + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02111-1301 USA + * + */ + +#include "super.h" +#include "cache.h" + +struct ceph_aux_inode { + struct timespec mtime; + loff_t size; +}; + +struct fscache_netfs ceph_cache_netfs = { + .name = "ceph", + .version = 0, +}; + +static uint16_t ceph_fscache_session_get_key(const void *cookie_netfs_data, + void *buffer, uint16_t maxbuf) +{ + const struct ceph_fs_client* fsc = cookie_netfs_data; + uint16_t klen; + + klen = sizeof(fsc->client->fsid); + if (klen > maxbuf) + return 0; + + memcpy(buffer, &fsc->client->fsid, klen); + return klen; +} + +static const struct fscache_cookie_def ceph_fscache_fsid_object_def = { + .name = "CEPH.fsid", + .type = FSCACHE_COOKIE_TYPE_INDEX, + .get_key = ceph_fscache_session_get_key, +}; + +int ceph_fscache_register(void) +{ + return fscache_register_netfs(&ceph_cache_netfs); +} + +void ceph_fscache_unregister(void) +{ + fscache_unregister_netfs(&ceph_cache_netfs); +} + +int ceph_fscache_register_fs(struct ceph_fs_client* fsc) +{ + fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index, + &ceph_fscache_fsid_object_def, + fsc, true); + + if (fsc->fscache == NULL) { + pr_err("Unable to resgister fsid: %p fscache cookie", fsc); + return 0; + } + + fsc->revalidate_wq = alloc_workqueue("ceph-revalidate", 0, 1); + if (fsc->revalidate_wq == NULL) + return -ENOMEM; + + return 0; +} + +static uint16_t ceph_fscache_inode_get_key(const void *cookie_netfs_data, + void *buffer, uint16_t maxbuf) +{ + const struct ceph_inode_info* ci = cookie_netfs_data; + uint16_t klen; + + /* use ceph virtual inode (id + snaphot) */ + klen = sizeof(ci->i_vino); + if (klen > maxbuf) + return 0; + + memcpy(buffer, &ci->i_vino, klen); + return klen; +} + +static uint16_t ceph_fscache_inode_get_aux(const void *cookie_netfs_data, + void *buffer, uint16_t bufmax) +{ + struct ceph_aux_inode aux; + const struct ceph_inode_info* ci = cookie_netfs_data; + const struct inode* inode = &ci->vfs_inode; + + memset(&aux, 0, sizeof(aux)); + aux.mtime = inode->i_mtime; + aux.size = inode->i_size; + + memcpy(buffer, &aux, sizeof(aux)); + + return sizeof(aux); +} + +static void ceph_fscache_inode_get_attr(const void *cookie_netfs_data, + uint64_t *size) +{ + const struct ceph_inode_info* ci = cookie_netfs_data; + const struct inode* inode = &ci->vfs_inode; + + *size = inode->i_size; +} + +static enum fscache_checkaux ceph_fscache_inode_check_aux( + void *cookie_netfs_data, const void *data, uint16_t dlen) +{ + struct ceph_aux_inode aux; + struct ceph_inode_info* ci = cookie_netfs_data; + struct inode* inode = &ci->vfs_inode; + + if (dlen != sizeof(aux)) + return FSCACHE_CHECKAUX_OBSOLETE; + + memset(&aux, 0, sizeof(aux)); + aux.mtime = inode->i_mtime; + aux.size = inode->i_size; + + if (memcmp(data, &aux, sizeof(aux)) != 0) + return FSCACHE_CHECKAUX_OBSOLETE; + + dout("ceph inode 0x%p cached okay", ci); + return FSCACHE_CHECKAUX_OKAY; +} + +static void ceph_fscache_inode_now_uncached(void* cookie_netfs_data) +{ + struct ceph_inode_info* ci = cookie_netfs_data; + struct pagevec pvec; + pgoff_t first; + int loop, nr_pages; + + pagevec_init(&pvec, 0); + first = 0; + + dout("ceph inode 0x%p now uncached", ci); + + while (1) { + nr_pages = pagevec_lookup(&pvec, ci->vfs_inode.i_mapping, first, + PAGEVEC_SIZE - pagevec_count(&pvec)); + + if (!nr_pages) + break; + + for (loop = 0; loop < nr_pages; loop++) + ClearPageFsCache(pvec.pages[loop]); + + first = pvec.pages[nr_pages - 1]->index + 1; + + pvec.nr = nr_pages; + pagevec_release(&pvec); + cond_resched(); + } +} + +static const struct fscache_cookie_def ceph_fscache_inode_object_def = { + .name = "CEPH.inode", + .type = FSCACHE_COOKIE_TYPE_DATAFILE, + .get_key = ceph_fscache_inode_get_key, + .get_attr = ceph_fscache_inode_get_attr, + .get_aux = ceph_fscache_inode_get_aux, + .check_aux = ceph_fscache_inode_check_aux, + .now_uncached = ceph_fscache_inode_now_uncached, +}; + +void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc, + struct ceph_inode_info* ci) +{ + struct inode* inode = &ci->vfs_inode; + + /* No caching for filesystem */ + if (fsc->fscache == NULL) + return; + + /* Only cache for regular files that are read only */ + if ((ci->vfs_inode.i_mode & S_IFREG) == 0) + return; + + /* Avoid multiple racing open requests */ + mutex_lock(&inode->i_mutex); + + if (ci->fscache) + goto done; + + ci->fscache = fscache_acquire_cookie(fsc->fscache, + &ceph_fscache_inode_object_def, + ci, true); + fscache_check_consistency(ci->fscache); +done: + mutex_unlock(&inode->i_mutex); + +} + +void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci) +{ + struct fscache_cookie* cookie; + + if ((cookie = ci->fscache) == NULL) + return; + + ci->fscache = NULL; + + fscache_uncache_all_inode_pages(cookie, &ci->vfs_inode); + fscache_relinquish_cookie(cookie, 0); +} + +static void ceph_vfs_readpage_complete(struct page *page, void *data, int error) +{ + if (!error) + SetPageUptodate(page); +} + +static void ceph_vfs_readpage_complete_unlock(struct page *page, void *data, int error) +{ + if (!error) + SetPageUptodate(page); + + unlock_page(page); +} + +static inline int cache_valid(struct ceph_inode_info *ci) +{ + return ((ceph_caps_issued(ci) & CEPH_CAP_FILE_CACHE) && + (ci->i_fscache_gen == ci->i_rdcache_gen)); +} + + +/* Atempt to read from the fscache, + * + * This function is called from the readpage_nounlock context. DO NOT attempt to + * unlock the page here (or in the callback). + */ +int ceph_readpage_from_fscache(struct inode *inode, struct page *page) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int ret; + + if (!cache_valid(ci)) + return -ENOBUFS; + + ret = fscache_read_or_alloc_page(ci->fscache, page, + ceph_vfs_readpage_complete, NULL, + GFP_KERNEL); + + switch (ret) { + case 0: /* Page found */ + dout("page read submitted\n"); + return 0; + case -ENOBUFS: /* Pages were not found, and can't be */ + case -ENODATA: /* Pages were not found */ + dout("page/inode not in cache\n"); + return ret; + default: + dout("%s: unknown error ret = %i\n", __func__, ret); + return ret; + } +} + +int ceph_readpages_from_fscache(struct inode *inode, + struct address_space *mapping, + struct list_head *pages, + unsigned *nr_pages) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int ret; + + if (!cache_valid(ci)) + return -ENOBUFS; + + ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages, + ceph_vfs_readpage_complete_unlock, + NULL, mapping_gfp_mask(mapping)); + + switch (ret) { + case 0: /* All pages found */ + dout("all-page read submitted\n"); + return 0; + case -ENOBUFS: /* Some pages were not found, and can't be */ + case -ENODATA: /* some pages were not found */ + dout("page/inode not in cache\n"); + return ret; + default: + dout("%s: unknown error ret = %i\n", __func__, ret); + return ret; + } +} + +void ceph_readpage_to_fscache(struct inode *inode, struct page *page) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int ret; + + if (!PageFsCache(page)) + return; + + if (!cache_valid(ci)) + return; + + ret = fscache_write_page(ci->fscache, page, GFP_KERNEL); + if (ret) + fscache_uncache_page(ci->fscache, page); +} + +void ceph_invalidate_fscache_page(struct inode* inode, struct page *page) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + + if (!PageFsCache(page)) + return; + + fscache_wait_on_page_write(ci->fscache, page); + fscache_uncache_page(ci->fscache, page); +} + +void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc) +{ + if (fsc->revalidate_wq) + destroy_workqueue(fsc->revalidate_wq); + + fscache_relinquish_cookie(fsc->fscache, 0); + fsc->fscache = NULL; +} + +static void ceph_revalidate_work(struct work_struct *work) +{ + int issued; + u32 orig_gen; + struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, + i_revalidate_work); + struct inode *inode = &ci->vfs_inode; + + spin_lock(&ci->i_ceph_lock); + issued = __ceph_caps_issued(ci, NULL); + orig_gen = ci->i_rdcache_gen; + spin_unlock(&ci->i_ceph_lock); + + if (!(issued & CEPH_CAP_FILE_CACHE)) { + dout("revalidate_work lost cache before validation %p\n", + inode); + goto out; + } + + if (!fscache_check_consistency(ci->fscache)) + fscache_invalidate(ci->fscache); + + spin_lock(&ci->i_ceph_lock); + /* Update the new valid generation (backwards sanity check too) */ + if (orig_gen > ci->i_fscache_gen) { + ci->i_fscache_gen = orig_gen; + } + spin_unlock(&ci->i_ceph_lock); + +out: + iput(&ci->vfs_inode); +} + +void ceph_queue_revalidate(struct inode *inode) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); + struct ceph_inode_info *ci = ceph_inode(inode); + + if (fsc->revalidate_wq == NULL || ci->fscache == NULL) + return; + + ihold(inode); + + if (queue_work(ceph_sb_to_client(inode->i_sb)->revalidate_wq, + &ci->i_revalidate_work)) { + dout("ceph_queue_revalidate %p\n", inode); + } else { + dout("ceph_queue_revalidate %p failed\n)", inode); + iput(inode); + } +} + +void ceph_fscache_inode_init(struct ceph_inode_info *ci) +{ + ci->fscache = NULL; + /* The first load is verifed cookie open time */ + ci->i_fscache_gen = 1; + INIT_WORK(&ci->i_revalidate_work, ceph_revalidate_work); +} diff --git a/kernel/fs/ceph/cache.h b/kernel/fs/ceph/cache.h new file mode 100644 index 000000000..5ac591bd0 --- /dev/null +++ b/kernel/fs/ceph/cache.h @@ -0,0 +1,182 @@ +/* + * Ceph cache definitions. + * + * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. + * Written by Milosz Tanski (milosz@adfin.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to: + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02111-1301 USA + * + */ + +#ifndef _CEPH_CACHE_H +#define _CEPH_CACHE_H + +#ifdef CONFIG_CEPH_FSCACHE + +extern struct fscache_netfs ceph_cache_netfs; + +int ceph_fscache_register(void); +void ceph_fscache_unregister(void); + +int ceph_fscache_register_fs(struct ceph_fs_client* fsc); +void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc); + +void ceph_fscache_inode_init(struct ceph_inode_info *ci); +void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc, + struct ceph_inode_info* ci); +void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci); + +int ceph_readpage_from_fscache(struct inode *inode, struct page *page); +int ceph_readpages_from_fscache(struct inode *inode, + struct address_space *mapping, + struct list_head *pages, + unsigned *nr_pages); +void ceph_readpage_to_fscache(struct inode *inode, struct page *page); +void ceph_invalidate_fscache_page(struct inode* inode, struct page *page); +void ceph_queue_revalidate(struct inode *inode); + +static inline void ceph_fscache_update_objectsize(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + fscache_attr_changed(ci->fscache); +} + +static inline void ceph_fscache_invalidate(struct inode *inode) +{ + fscache_invalidate(ceph_inode(inode)->fscache); +} + +static inline void ceph_fscache_uncache_page(struct inode *inode, + struct page *page) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + return fscache_uncache_page(ci->fscache, page); +} + +static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp) +{ + struct inode* inode = page->mapping->host; + struct ceph_inode_info *ci = ceph_inode(inode); + return fscache_maybe_release_page(ci->fscache, page, gfp); +} + +static inline void ceph_fscache_readpage_cancel(struct inode *inode, + struct page *page) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + if (fscache_cookie_valid(ci->fscache) && PageFsCache(page)) + __fscache_uncache_page(ci->fscache, page); +} + +static inline void ceph_fscache_readpages_cancel(struct inode *inode, + struct list_head *pages) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + return fscache_readpages_cancel(ci->fscache, pages); +} + +#else + +static inline int ceph_fscache_register(void) +{ + return 0; +} + +static inline void ceph_fscache_unregister(void) +{ +} + +static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc) +{ + return 0; +} + +static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc) +{ +} + +static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci) +{ +} + +static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc, + struct ceph_inode_info* ci) +{ +} + +static inline void ceph_fscache_uncache_page(struct inode *inode, + struct page *pages) +{ +} + +static inline int ceph_readpage_from_fscache(struct inode* inode, + struct page *page) +{ + return -ENOBUFS; +} + +static inline int ceph_readpages_from_fscache(struct inode *inode, + struct address_space *mapping, + struct list_head *pages, + unsigned *nr_pages) +{ + return -ENOBUFS; +} + +static inline void ceph_readpage_to_fscache(struct inode *inode, + struct page *page) +{ +} + +static inline void ceph_fscache_update_objectsize(struct inode *inode) +{ +} + +static inline void ceph_fscache_invalidate(struct inode *inode) +{ +} + +static inline void ceph_invalidate_fscache_page(struct inode *inode, + struct page *page) +{ +} + +static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci) +{ +} + +static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp) +{ + return 1; +} + +static inline void ceph_fscache_readpage_cancel(struct inode *inode, + struct page *page) +{ +} + +static inline void ceph_fscache_readpages_cancel(struct inode *inode, + struct list_head *pages) +{ +} + +static inline void ceph_queue_revalidate(struct inode *inode) +{ +} + +#endif + +#endif diff --git a/kernel/fs/ceph/caps.c b/kernel/fs/ceph/caps.c new file mode 100644 index 000000000..be5ea6af8 --- /dev/null +++ b/kernel/fs/ceph/caps.c @@ -0,0 +1,3456 @@ +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "super.h" +#include "mds_client.h" +#include "cache.h" +#include +#include + +/* + * Capability management + * + * The Ceph metadata servers control client access to inode metadata + * and file data by issuing capabilities, granting clients permission + * to read and/or write both inode field and file data to OSDs + * (storage nodes). Each capability consists of a set of bits + * indicating which operations are allowed. + * + * If the client holds a *_SHARED cap, the client has a coherent value + * that can be safely read from the cached inode. + * + * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the + * client is allowed to change inode attributes (e.g., file size, + * mtime), note its dirty state in the ceph_cap, and asynchronously + * flush that metadata change to the MDS. + * + * In the event of a conflicting operation (perhaps by another + * client), the MDS will revoke the conflicting client capabilities. + * + * In order for a client to cache an inode, it must hold a capability + * with at least one MDS server. When inodes are released, release + * notifications are batched and periodically sent en masse to the MDS + * cluster to release server state. + */ + + +/* + * Generate readable cap strings for debugging output. + */ +#define MAX_CAP_STR 20 +static char cap_str[MAX_CAP_STR][40]; +static DEFINE_SPINLOCK(cap_str_lock); +static int last_cap_str; + +static char *gcap_string(char *s, int c) +{ + if (c & CEPH_CAP_GSHARED) + *s++ = 's'; + if (c & CEPH_CAP_GEXCL) + *s++ = 'x'; + if (c & CEPH_CAP_GCACHE) + *s++ = 'c'; + if (c & CEPH_CAP_GRD) + *s++ = 'r'; + if (c & CEPH_CAP_GWR) + *s++ = 'w'; + if (c & CEPH_CAP_GBUFFER) + *s++ = 'b'; + if (c & CEPH_CAP_GLAZYIO) + *s++ = 'l'; + return s; +} + +const char *ceph_cap_string(int caps) +{ + int i; + char *s; + int c; + + spin_lock(&cap_str_lock); + i = last_cap_str++; + if (last_cap_str == MAX_CAP_STR) + last_cap_str = 0; + spin_unlock(&cap_str_lock); + + s = cap_str[i]; + + if (caps & CEPH_CAP_PIN) + *s++ = 'p'; + + c = (caps >> CEPH_CAP_SAUTH) & 3; + if (c) { + *s++ = 'A'; + s = gcap_string(s, c); + } + + c = (caps >> CEPH_CAP_SLINK) & 3; + if (c) { + *s++ = 'L'; + s = gcap_string(s, c); + } + + c = (caps >> CEPH_CAP_SXATTR) & 3; + if (c) { + *s++ = 'X'; + s = gcap_string(s, c); + } + + c = caps >> CEPH_CAP_SFILE; + if (c) { + *s++ = 'F'; + s = gcap_string(s, c); + } + + if (s == cap_str[i]) + *s++ = '-'; + *s = 0; + return cap_str[i]; +} + +void ceph_caps_init(struct ceph_mds_client *mdsc) +{ + INIT_LIST_HEAD(&mdsc->caps_list); + spin_lock_init(&mdsc->caps_list_lock); +} + +void ceph_caps_finalize(struct ceph_mds_client *mdsc) +{ + struct ceph_cap *cap; + + spin_lock(&mdsc->caps_list_lock); + while (!list_empty(&mdsc->caps_list)) { + cap = list_first_entry(&mdsc->caps_list, + struct ceph_cap, caps_item); + list_del(&cap->caps_item); + kmem_cache_free(ceph_cap_cachep, cap); + } + mdsc->caps_total_count = 0; + mdsc->caps_avail_count = 0; + mdsc->caps_use_count = 0; + mdsc->caps_reserve_count = 0; + mdsc->caps_min_count = 0; + spin_unlock(&mdsc->caps_list_lock); +} + +void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta) +{ + spin_lock(&mdsc->caps_list_lock); + mdsc->caps_min_count += delta; + BUG_ON(mdsc->caps_min_count < 0); + spin_unlock(&mdsc->caps_list_lock); +} + +void ceph_reserve_caps(struct ceph_mds_client *mdsc, + struct ceph_cap_reservation *ctx, int need) +{ + int i; + struct ceph_cap *cap; + int have; + int alloc = 0; + LIST_HEAD(newcaps); + + dout("reserve caps ctx=%p need=%d\n", ctx, need); + + /* first reserve any caps that are already allocated */ + spin_lock(&mdsc->caps_list_lock); + if (mdsc->caps_avail_count >= need) + have = need; + else + have = mdsc->caps_avail_count; + mdsc->caps_avail_count -= have; + mdsc->caps_reserve_count += have; + BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + + mdsc->caps_reserve_count + + mdsc->caps_avail_count); + spin_unlock(&mdsc->caps_list_lock); + + for (i = have; i < need; i++) { + cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); + if (!cap) + break; + list_add(&cap->caps_item, &newcaps); + alloc++; + } + /* we didn't manage to reserve as much as we needed */ + if (have + alloc != need) + pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n", + ctx, need, have + alloc); + + spin_lock(&mdsc->caps_list_lock); + mdsc->caps_total_count += alloc; + mdsc->caps_reserve_count += alloc; + list_splice(&newcaps, &mdsc->caps_list); + + BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + + mdsc->caps_reserve_count + + mdsc->caps_avail_count); + spin_unlock(&mdsc->caps_list_lock); + + ctx->count = need; + dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n", + ctx, mdsc->caps_total_count, mdsc->caps_use_count, + mdsc->caps_reserve_count, mdsc->caps_avail_count); +} + +int ceph_unreserve_caps(struct ceph_mds_client *mdsc, + struct ceph_cap_reservation *ctx) +{ + dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count); + if (ctx->count) { + spin_lock(&mdsc->caps_list_lock); + BUG_ON(mdsc->caps_reserve_count < ctx->count); + mdsc->caps_reserve_count -= ctx->count; + mdsc->caps_avail_count += ctx->count; + ctx->count = 0; + dout("unreserve caps %d = %d used + %d resv + %d avail\n", + mdsc->caps_total_count, mdsc->caps_use_count, + mdsc->caps_reserve_count, mdsc->caps_avail_count); + BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + + mdsc->caps_reserve_count + + mdsc->caps_avail_count); + spin_unlock(&mdsc->caps_list_lock); + } + return 0; +} + +struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, + struct ceph_cap_reservation *ctx) +{ + struct ceph_cap *cap = NULL; + + /* temporary, until we do something about cap import/export */ + if (!ctx) { + cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); + if (cap) { + spin_lock(&mdsc->caps_list_lock); + mdsc->caps_use_count++; + mdsc->caps_total_count++; + spin_unlock(&mdsc->caps_list_lock); + } + return cap; + } + + spin_lock(&mdsc->caps_list_lock); + dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n", + ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count, + mdsc->caps_reserve_count, mdsc->caps_avail_count); + BUG_ON(!ctx->count); + BUG_ON(ctx->count > mdsc->caps_reserve_count); + BUG_ON(list_empty(&mdsc->caps_list)); + + ctx->count--; + mdsc->caps_reserve_count--; + mdsc->caps_use_count++; + + cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item); + list_del(&cap->caps_item); + + BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + + mdsc->caps_reserve_count + mdsc->caps_avail_count); + spin_unlock(&mdsc->caps_list_lock); + return cap; +} + +void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap) +{ + spin_lock(&mdsc->caps_list_lock); + dout("put_cap %p %d = %d used + %d resv + %d avail\n", + cap, mdsc->caps_total_count, mdsc->caps_use_count, + mdsc->caps_reserve_count, mdsc->caps_avail_count); + mdsc->caps_use_count--; + /* + * Keep some preallocated caps around (ceph_min_count), to + * avoid lots of free/alloc churn. + */ + if (mdsc->caps_avail_count >= mdsc->caps_reserve_count + + mdsc->caps_min_count) { + mdsc->caps_total_count--; + kmem_cache_free(ceph_cap_cachep, cap); + } else { + mdsc->caps_avail_count++; + list_add(&cap->caps_item, &mdsc->caps_list); + } + + BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + + mdsc->caps_reserve_count + mdsc->caps_avail_count); + spin_unlock(&mdsc->caps_list_lock); +} + +void ceph_reservation_status(struct ceph_fs_client *fsc, + int *total, int *avail, int *used, int *reserved, + int *min) +{ + struct ceph_mds_client *mdsc = fsc->mdsc; + + if (total) + *total = mdsc->caps_total_count; + if (avail) + *avail = mdsc->caps_avail_count; + if (used) + *used = mdsc->caps_use_count; + if (reserved) + *reserved = mdsc->caps_reserve_count; + if (min) + *min = mdsc->caps_min_count; +} + +/* + * Find ceph_cap for given mds, if any. + * + * Called with i_ceph_lock held. + */ +static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds) +{ + struct ceph_cap *cap; + struct rb_node *n = ci->i_caps.rb_node; + + while (n) { + cap = rb_entry(n, struct ceph_cap, ci_node); + if (mds < cap->mds) + n = n->rb_left; + else if (mds > cap->mds) + n = n->rb_right; + else + return cap; + } + return NULL; +} + +struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds) +{ + struct ceph_cap *cap; + + spin_lock(&ci->i_ceph_lock); + cap = __get_cap_for_mds(ci, mds); + spin_unlock(&ci->i_ceph_lock); + return cap; +} + +/* + * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1. + */ +static int __ceph_get_cap_mds(struct ceph_inode_info *ci) +{ + struct ceph_cap *cap; + int mds = -1; + struct rb_node *p; + + /* prefer mds with WR|BUFFER|EXCL caps */ + for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { + cap = rb_entry(p, struct ceph_cap, ci_node); + mds = cap->mds; + if (cap->issued & (CEPH_CAP_FILE_WR | + CEPH_CAP_FILE_BUFFER | + CEPH_CAP_FILE_EXCL)) + break; + } + return mds; +} + +int ceph_get_cap_mds(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int mds; + spin_lock(&ci->i_ceph_lock); + mds = __ceph_get_cap_mds(ceph_inode(inode)); + spin_unlock(&ci->i_ceph_lock); + return mds; +} + +/* + * Called under i_ceph_lock. + */ +static void __insert_cap_node(struct ceph_inode_info *ci, + struct ceph_cap *new) +{ + struct rb_node **p = &ci->i_caps.rb_node; + struct rb_node *parent = NULL; + struct ceph_cap *cap = NULL; + + while (*p) { + parent = *p; + cap = rb_entry(parent, struct ceph_cap, ci_node); + if (new->mds < cap->mds) + p = &(*p)->rb_left; + else if (new->mds > cap->mds) + p = &(*p)->rb_right; + else + BUG(); + } + + rb_link_node(&new->ci_node, parent, p); + rb_insert_color(&new->ci_node, &ci->i_caps); +} + +/* + * (re)set cap hold timeouts, which control the delayed release + * of unused caps back to the MDS. Should be called on cap use. + */ +static void __cap_set_timeouts(struct ceph_mds_client *mdsc, + struct ceph_inode_info *ci) +{ + struct ceph_mount_options *ma = mdsc->fsc->mount_options; + + ci->i_hold_caps_min = round_jiffies(jiffies + + ma->caps_wanted_delay_min * HZ); + ci->i_hold_caps_max = round_jiffies(jiffies + + ma->caps_wanted_delay_max * HZ); + dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode, + ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies); +} + +/* + * (Re)queue cap at the end of the delayed cap release list. + * + * If I_FLUSH is set, leave the inode at the front of the list. + * + * Caller holds i_ceph_lock + * -> we take mdsc->cap_delay_lock + */ +static void __cap_delay_requeue(struct ceph_mds_client *mdsc, + struct ceph_inode_info *ci) +{ + __cap_set_timeouts(mdsc, ci); + dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode, + ci->i_ceph_flags, ci->i_hold_caps_max); + if (!mdsc->stopping) { + spin_lock(&mdsc->cap_delay_lock); + if (!list_empty(&ci->i_cap_delay_list)) { + if (ci->i_ceph_flags & CEPH_I_FLUSH) + goto no_change; + list_del_init(&ci->i_cap_delay_list); + } + list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list); +no_change: + spin_unlock(&mdsc->cap_delay_lock); + } +} + +/* + * Queue an inode for immediate writeback. Mark inode with I_FLUSH, + * indicating we should send a cap message to flush dirty metadata + * asap, and move to the front of the delayed cap list. + */ +static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc, + struct ceph_inode_info *ci) +{ + dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode); + spin_lock(&mdsc->cap_delay_lock); + ci->i_ceph_flags |= CEPH_I_FLUSH; + if (!list_empty(&ci->i_cap_delay_list)) + list_del_init(&ci->i_cap_delay_list); + list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list); + spin_unlock(&mdsc->cap_delay_lock); +} + +/* + * Cancel delayed work on cap. + * + * Caller must hold i_ceph_lock. + */ +static void __cap_delay_cancel(struct ceph_mds_client *mdsc, + struct ceph_inode_info *ci) +{ + dout("__cap_delay_cancel %p\n", &ci->vfs_inode); + if (list_empty(&ci->i_cap_delay_list)) + return; + spin_lock(&mdsc->cap_delay_lock); + list_del_init(&ci->i_cap_delay_list); + spin_unlock(&mdsc->cap_delay_lock); +} + +/* + * Common issue checks for add_cap, handle_cap_grant. + */ +static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap, + unsigned issued) +{ + unsigned had = __ceph_caps_issued(ci, NULL); + + /* + * Each time we receive FILE_CACHE anew, we increment + * i_rdcache_gen. + */ + if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && + (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) { + ci->i_rdcache_gen++; + } + + /* + * if we are newly issued FILE_SHARED, mark dir not complete; we + * don't know what happened to this directory while we didn't + * have the cap. + */ + if ((issued & CEPH_CAP_FILE_SHARED) && + (had & CEPH_CAP_FILE_SHARED) == 0) { + ci->i_shared_gen++; + if (S_ISDIR(ci->vfs_inode.i_mode)) { + dout(" marking %p NOT complete\n", &ci->vfs_inode); + __ceph_dir_clear_complete(ci); + } + } +} + +/* + * Add a capability under the given MDS session. + * + * Caller should hold session snap_rwsem (read) and s_mutex. + * + * @fmode is the open file mode, if we are opening a file, otherwise + * it is < 0. (This is so we can atomically add the cap and add an + * open file reference to it.) + */ +void ceph_add_cap(struct inode *inode, + struct ceph_mds_session *session, u64 cap_id, + int fmode, unsigned issued, unsigned wanted, + unsigned seq, unsigned mseq, u64 realmino, int flags, + struct ceph_cap **new_cap) +{ + struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_cap *cap; + int mds = session->s_mds; + int actual_wanted; + + dout("add_cap %p mds%d cap %llx %s seq %d\n", inode, + session->s_mds, cap_id, ceph_cap_string(issued), seq); + + /* + * If we are opening the file, include file mode wanted bits + * in wanted. + */ + if (fmode >= 0) + wanted |= ceph_caps_for_mode(fmode); + + cap = __get_cap_for_mds(ci, mds); + if (!cap) { + cap = *new_cap; + *new_cap = NULL; + + cap->issued = 0; + cap->implemented = 0; + cap->mds = mds; + cap->mds_wanted = 0; + cap->mseq = 0; + + cap->ci = ci; + __insert_cap_node(ci, cap); + + /* add to session cap list */ + cap->session = session; + spin_lock(&session->s_cap_lock); + list_add_tail(&cap->session_caps, &session->s_caps); + session->s_nr_caps++; + spin_unlock(&session->s_cap_lock); + } else { + /* + * auth mds of the inode changed. we received the cap export + * message, but still haven't received the cap import message. + * handle_cap_export() updated the new auth MDS' cap. + * + * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing + * a message that was send before the cap import message. So + * don't remove caps. + */ + if (ceph_seq_cmp(seq, cap->seq) <= 0) { + WARN_ON(cap != ci->i_auth_cap); + WARN_ON(cap->cap_id != cap_id); + seq = cap->seq; + mseq = cap->mseq; + issued |= cap->issued; + flags |= CEPH_CAP_FLAG_AUTH; + } + } + + if (!ci->i_snap_realm) { + /* + * add this inode to the appropriate snap realm + */ + struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc, + realmino); + if (realm) { + spin_lock(&realm->inodes_with_caps_lock); + ci->i_snap_realm = realm; + list_add(&ci->i_snap_realm_item, + &realm->inodes_with_caps); + spin_unlock(&realm->inodes_with_caps_lock); + } else { + pr_err("ceph_add_cap: couldn't find snap realm %llx\n", + realmino); + WARN_ON(!realm); + } + } + + __check_cap_issue(ci, cap, issued); + + /* + * If we are issued caps we don't want, or the mds' wanted + * value appears to be off, queue a check so we'll release + * later and/or update the mds wanted value. + */ + actual_wanted = __ceph_caps_wanted(ci); + if ((wanted & ~actual_wanted) || + (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) { + dout(" issued %s, mds wanted %s, actual %s, queueing\n", + ceph_cap_string(issued), ceph_cap_string(wanted), + ceph_cap_string(actual_wanted)); + __cap_delay_requeue(mdsc, ci); + } + + if (flags & CEPH_CAP_FLAG_AUTH) { + if (ci->i_auth_cap == NULL || + ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) { + ci->i_auth_cap = cap; + cap->mds_wanted = wanted; + } + } else { + WARN_ON(ci->i_auth_cap == cap); + } + + dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n", + inode, ceph_vinop(inode), cap, ceph_cap_string(issued), + ceph_cap_string(issued|cap->issued), seq, mds); + cap->cap_id = cap_id; + cap->issued = issued; + cap->implemented |= issued; + if (ceph_seq_cmp(mseq, cap->mseq) > 0) + cap->mds_wanted = wanted; + else + cap->mds_wanted |= wanted; + cap->seq = seq; + cap->issue_seq = seq; + cap->mseq = mseq; + cap->cap_gen = session->s_cap_gen; + + if (fmode >= 0) + __ceph_get_fmode(ci, fmode); +} + +/* + * Return true if cap has not timed out and belongs to the current + * generation of the MDS session (i.e. has not gone 'stale' due to + * us losing touch with the mds). + */ +static int __cap_is_valid(struct ceph_cap *cap) +{ + unsigned long ttl; + u32 gen; + + spin_lock(&cap->session->s_gen_ttl_lock); + gen = cap->session->s_cap_gen; + ttl = cap->session->s_cap_ttl; + spin_unlock(&cap->session->s_gen_ttl_lock); + + if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) { + dout("__cap_is_valid %p cap %p issued %s " + "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode, + cap, ceph_cap_string(cap->issued), cap->cap_gen, gen); + return 0; + } + + return 1; +} + +/* + * Return set of valid cap bits issued to us. Note that caps time + * out, and may be invalidated in bulk if the client session times out + * and session->s_cap_gen is bumped. + */ +int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented) +{ + int have = ci->i_snap_caps; + struct ceph_cap *cap; + struct rb_node *p; + + if (implemented) + *implemented = 0; + for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { + cap = rb_entry(p, struct ceph_cap, ci_node); + if (!__cap_is_valid(cap)) + continue; + dout("__ceph_caps_issued %p cap %p issued %s\n", + &ci->vfs_inode, cap, ceph_cap_string(cap->issued)); + have |= cap->issued; + if (implemented) + *implemented |= cap->implemented; + } + /* + * exclude caps issued by non-auth MDS, but are been revoking + * by the auth MDS. The non-auth MDS should be revoking/exporting + * these caps, but the message is delayed. + */ + if (ci->i_auth_cap) { + cap = ci->i_auth_cap; + have &= ~cap->implemented | cap->issued; + } + return have; +} + +/* + * Get cap bits issued by caps other than @ocap + */ +int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap) +{ + int have = ci->i_snap_caps; + struct ceph_cap *cap; + struct rb_node *p; + + for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { + cap = rb_entry(p, struct ceph_cap, ci_node); + if (cap == ocap) + continue; + if (!__cap_is_valid(cap)) + continue; + have |= cap->issued; + } + return have; +} + +/* + * Move a cap to the end of the LRU (oldest caps at list head, newest + * at list tail). + */ +static void __touch_cap(struct ceph_cap *cap) +{ + struct ceph_mds_session *s = cap->session; + + spin_lock(&s->s_cap_lock); + if (s->s_cap_iterator == NULL) { + dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap, + s->s_mds); + list_move_tail(&cap->session_caps, &s->s_caps); + } else { + dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n", + &cap->ci->vfs_inode, cap, s->s_mds); + } + spin_unlock(&s->s_cap_lock); +} + +/* + * Check if we hold the given mask. If so, move the cap(s) to the + * front of their respective LRUs. (This is the preferred way for + * callers to check for caps they want.) + */ +int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch) +{ + struct ceph_cap *cap; + struct rb_node *p; + int have = ci->i_snap_caps; + + if ((have & mask) == mask) { + dout("__ceph_caps_issued_mask %p snap issued %s" + " (mask %s)\n", &ci->vfs_inode, + ceph_cap_string(have), + ceph_cap_string(mask)); + return 1; + } + + for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { + cap = rb_entry(p, struct ceph_cap, ci_node); + if (!__cap_is_valid(cap)) + continue; + if ((cap->issued & mask) == mask) { + dout("__ceph_caps_issued_mask %p cap %p issued %s" + " (mask %s)\n", &ci->vfs_inode, cap, + ceph_cap_string(cap->issued), + ceph_cap_string(mask)); + if (touch) + __touch_cap(cap); + return 1; + } + + /* does a combination of caps satisfy mask? */ + have |= cap->issued; + if ((have & mask) == mask) { + dout("__ceph_caps_issued_mask %p combo issued %s" + " (mask %s)\n", &ci->vfs_inode, + ceph_cap_string(cap->issued), + ceph_cap_string(mask)); + if (touch) { + struct rb_node *q; + + /* touch this + preceding caps */ + __touch_cap(cap); + for (q = rb_first(&ci->i_caps); q != p; + q = rb_next(q)) { + cap = rb_entry(q, struct ceph_cap, + ci_node); + if (!__cap_is_valid(cap)) + continue; + __touch_cap(cap); + } + } + return 1; + } + } + + return 0; +} + +/* + * Return true if mask caps are currently being revoked by an MDS. + */ +int __ceph_caps_revoking_other(struct ceph_inode_info *ci, + struct ceph_cap *ocap, int mask) +{ + struct ceph_cap *cap; + struct rb_node *p; + + for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { + cap = rb_entry(p, struct ceph_cap, ci_node); + if (cap != ocap && + (cap->implemented & ~cap->issued & mask)) + return 1; + } + return 0; +} + +int ceph_caps_revoking(struct ceph_inode_info *ci, int mask) +{ + struct inode *inode = &ci->vfs_inode; + int ret; + + spin_lock(&ci->i_ceph_lock); + ret = __ceph_caps_revoking_other(ci, NULL, mask); + spin_unlock(&ci->i_ceph_lock); + dout("ceph_caps_revoking %p %s = %d\n", inode, + ceph_cap_string(mask), ret); + return ret; +} + +int __ceph_caps_used(struct ceph_inode_info *ci) +{ + int used = 0; + if (ci->i_pin_ref) + used |= CEPH_CAP_PIN; + if (ci->i_rd_ref) + used |= CEPH_CAP_FILE_RD; + if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages) + used |= CEPH_CAP_FILE_CACHE; + if (ci->i_wr_ref) + used |= CEPH_CAP_FILE_WR; + if (ci->i_wb_ref || ci->i_wrbuffer_ref) + used |= CEPH_CAP_FILE_BUFFER; + return used; +} + +/* + * wanted, by virtue of open file modes + */ +int __ceph_caps_file_wanted(struct ceph_inode_info *ci) +{ + int want = 0; + int mode; + for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++) + if (ci->i_nr_by_mode[mode]) + want |= ceph_caps_for_mode(mode); + return want; +} + +/* + * Return caps we have registered with the MDS(s) as 'wanted'. + */ +int __ceph_caps_mds_wanted(struct ceph_inode_info *ci) +{ + struct ceph_cap *cap; + struct rb_node *p; + int mds_wanted = 0; + + for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { + cap = rb_entry(p, struct ceph_cap, ci_node); + if (!__cap_is_valid(cap)) + continue; + if (cap == ci->i_auth_cap) + mds_wanted |= cap->mds_wanted; + else + mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR); + } + return mds_wanted; +} + +/* + * called under i_ceph_lock + */ +static int __ceph_is_any_caps(struct ceph_inode_info *ci) +{ + return !RB_EMPTY_ROOT(&ci->i_caps); +} + +int ceph_is_any_caps(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int ret; + + spin_lock(&ci->i_ceph_lock); + ret = __ceph_is_any_caps(ci); + spin_unlock(&ci->i_ceph_lock); + + return ret; +} + +static void drop_inode_snap_realm(struct ceph_inode_info *ci) +{ + struct ceph_snap_realm *realm = ci->i_snap_realm; + spin_lock(&realm->inodes_with_caps_lock); + list_del_init(&ci->i_snap_realm_item); + ci->i_snap_realm_counter++; + ci->i_snap_realm = NULL; + spin_unlock(&realm->inodes_with_caps_lock); + ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc, + realm); +} + +/* + * Remove a cap. Take steps to deal with a racing iterate_session_caps. + * + * caller should hold i_ceph_lock. + * caller will not hold session s_mutex if called from destroy_inode. + */ +void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release) +{ + struct ceph_mds_session *session = cap->session; + struct ceph_inode_info *ci = cap->ci; + struct ceph_mds_client *mdsc = + ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; + int removed = 0; + + dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode); + + /* remove from session list */ + spin_lock(&session->s_cap_lock); + /* + * s_cap_reconnect is protected by s_cap_lock. no one changes + * s_cap_gen while session is in the reconnect state. + */ + if (queue_release && + (!session->s_cap_reconnect || + cap->cap_gen == session->s_cap_gen)) + __queue_cap_release(session, ci->i_vino.ino, cap->cap_id, + cap->mseq, cap->issue_seq); + + if (session->s_cap_iterator == cap) { + /* not yet, we are iterating over this very cap */ + dout("__ceph_remove_cap delaying %p removal from session %p\n", + cap, cap->session); + } else { + list_del_init(&cap->session_caps); + session->s_nr_caps--; + cap->session = NULL; + removed = 1; + } + /* protect backpointer with s_cap_lock: see iterate_session_caps */ + cap->ci = NULL; + spin_unlock(&session->s_cap_lock); + + /* remove from inode list */ + rb_erase(&cap->ci_node, &ci->i_caps); + if (ci->i_auth_cap == cap) + ci->i_auth_cap = NULL; + + if (removed) + ceph_put_cap(mdsc, cap); + + /* when reconnect denied, we remove session caps forcibly, + * i_wr_ref can be non-zero. If there are ongoing write, + * keep i_snap_realm. + */ + if (!__ceph_is_any_caps(ci) && ci->i_wr_ref == 0 && ci->i_snap_realm) + drop_inode_snap_realm(ci); + + if (!__ceph_is_any_real_caps(ci)) + __cap_delay_cancel(mdsc, ci); +} + +/* + * Build and send a cap message to the given MDS. + * + * Caller should be holding s_mutex. + */ +static int send_cap_msg(struct ceph_mds_session *session, + u64 ino, u64 cid, int op, + int caps, int wanted, int dirty, + u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq, + u64 size, u64 max_size, + struct timespec *mtime, struct timespec *atime, + u64 time_warp_seq, + kuid_t uid, kgid_t gid, umode_t mode, + u64 xattr_version, + struct ceph_buffer *xattrs_buf, + u64 follows, bool inline_data) +{ + struct ceph_mds_caps *fc; + struct ceph_msg *msg; + void *p; + size_t extra_len; + + dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s" + " seq %u/%u mseq %u follows %lld size %llu/%llu" + " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op), + cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted), + ceph_cap_string(dirty), + seq, issue_seq, mseq, follows, size, max_size, + xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0); + + /* flock buffer size + inline version + inline data size */ + extra_len = 4 + 8 + 4; + msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc) + extra_len, + GFP_NOFS, false); + if (!msg) + return -ENOMEM; + + msg->hdr.tid = cpu_to_le64(flush_tid); + + fc = msg->front.iov_base; + memset(fc, 0, sizeof(*fc)); + + fc->cap_id = cpu_to_le64(cid); + fc->op = cpu_to_le32(op); + fc->seq = cpu_to_le32(seq); + fc->issue_seq = cpu_to_le32(issue_seq); + fc->migrate_seq = cpu_to_le32(mseq); + fc->caps = cpu_to_le32(caps); + fc->wanted = cpu_to_le32(wanted); + fc->dirty = cpu_to_le32(dirty); + fc->ino = cpu_to_le64(ino); + fc->snap_follows = cpu_to_le64(follows); + + fc->size = cpu_to_le64(size); + fc->max_size = cpu_to_le64(max_size); + if (mtime) + ceph_encode_timespec(&fc->mtime, mtime); + if (atime) + ceph_encode_timespec(&fc->atime, atime); + fc->time_warp_seq = cpu_to_le32(time_warp_seq); + + fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid)); + fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid)); + fc->mode = cpu_to_le32(mode); + + p = fc + 1; + /* flock buffer size */ + ceph_encode_32(&p, 0); + /* inline version */ + ceph_encode_64(&p, inline_data ? 0 : CEPH_INLINE_NONE); + /* inline data size */ + ceph_encode_32(&p, 0); + + fc->xattr_version = cpu_to_le64(xattr_version); + if (xattrs_buf) { + msg->middle = ceph_buffer_get(xattrs_buf); + fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len); + msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len); + } + + ceph_con_send(&session->s_con, msg); + return 0; +} + +void __queue_cap_release(struct ceph_mds_session *session, + u64 ino, u64 cap_id, u32 migrate_seq, + u32 issue_seq) +{ + struct ceph_msg *msg; + struct ceph_mds_cap_release *head; + struct ceph_mds_cap_item *item; + + BUG_ON(!session->s_num_cap_releases); + msg = list_first_entry(&session->s_cap_releases, + struct ceph_msg, list_head); + + dout(" adding %llx release to mds%d msg %p (%d left)\n", + ino, session->s_mds, msg, session->s_num_cap_releases); + + BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE); + head = msg->front.iov_base; + le32_add_cpu(&head->num, 1); + item = msg->front.iov_base + msg->front.iov_len; + item->ino = cpu_to_le64(ino); + item->cap_id = cpu_to_le64(cap_id); + item->migrate_seq = cpu_to_le32(migrate_seq); + item->seq = cpu_to_le32(issue_seq); + + session->s_num_cap_releases--; + + msg->front.iov_len += sizeof(*item); + if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) { + dout(" release msg %p full\n", msg); + list_move_tail(&msg->list_head, &session->s_cap_releases_done); + } else { + dout(" release msg %p at %d/%d (%d)\n", msg, + (int)le32_to_cpu(head->num), + (int)CEPH_CAPS_PER_RELEASE, + (int)msg->front.iov_len); + } +} + +/* + * Queue cap releases when an inode is dropped from our cache. Since + * inode is about to be destroyed, there is no need for i_ceph_lock. + */ +void ceph_queue_caps_release(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct rb_node *p; + + p = rb_first(&ci->i_caps); + while (p) { + struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node); + p = rb_next(p); + __ceph_remove_cap(cap, true); + } +} + +/* + * Send a cap msg on the given inode. Update our caps state, then + * drop i_ceph_lock and send the message. + * + * Make note of max_size reported/requested from mds, revoked caps + * that have now been implemented. + * + * Make half-hearted attempt ot to invalidate page cache if we are + * dropping RDCACHE. Note that this will leave behind locked pages + * that we'll then need to deal with elsewhere. + * + * Return non-zero if delayed release, or we experienced an error + * such that the caller should requeue + retry later. + * + * called with i_ceph_lock, then drops it. + * caller should hold snap_rwsem (read), s_mutex. + */ +static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap, + int op, int used, int want, int retain, int flushing, + unsigned *pflush_tid) + __releases(cap->ci->i_ceph_lock) +{ + struct ceph_inode_info *ci = cap->ci; + struct inode *inode = &ci->vfs_inode; + u64 cap_id = cap->cap_id; + int held, revoking, dropping, keep; + u64 seq, issue_seq, mseq, time_warp_seq, follows; + u64 size, max_size; + struct timespec mtime, atime; + int wake = 0; + umode_t mode; + kuid_t uid; + kgid_t gid; + struct ceph_mds_session *session; + u64 xattr_version = 0; + struct ceph_buffer *xattr_blob = NULL; + int delayed = 0; + u64 flush_tid = 0; + int i; + int ret; + bool inline_data; + + held = cap->issued | cap->implemented; + revoking = cap->implemented & ~cap->issued; + retain &= ~revoking; + dropping = cap->issued & ~retain; + + dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n", + inode, cap, cap->session, + ceph_cap_string(held), ceph_cap_string(held & retain), + ceph_cap_string(revoking)); + BUG_ON((retain & CEPH_CAP_PIN) == 0); + + session = cap->session; + + /* don't release wanted unless we've waited a bit. */ + if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 && + time_before(jiffies, ci->i_hold_caps_min)) { + dout(" delaying issued %s -> %s, wanted %s -> %s on send\n", + ceph_cap_string(cap->issued), + ceph_cap_string(cap->issued & retain), + ceph_cap_string(cap->mds_wanted), + ceph_cap_string(want)); + want |= cap->mds_wanted; + retain |= cap->issued; + delayed = 1; + } + ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH); + + cap->issued &= retain; /* drop bits we don't want */ + if (cap->implemented & ~cap->issued) { + /* + * Wake up any waiters on wanted -> needed transition. + * This is due to the weird transition from buffered + * to sync IO... we need to flush dirty pages _before_ + * allowing sync writes to avoid reordering. + */ + wake = 1; + } + cap->implemented &= cap->issued | used; + cap->mds_wanted = want; + + if (flushing) { + /* + * assign a tid for flush operations so we can avoid + * flush1 -> dirty1 -> flush2 -> flushack1 -> mark + * clean type races. track latest tid for every bit + * so we can handle flush AxFw, flush Fw, and have the + * first ack clean Ax. + */ + flush_tid = ++ci->i_cap_flush_last_tid; + if (pflush_tid) + *pflush_tid = flush_tid; + dout(" cap_flush_tid %d\n", (int)flush_tid); + for (i = 0; i < CEPH_CAP_BITS; i++) + if (flushing & (1 << i)) + ci->i_cap_flush_tid[i] = flush_tid; + + follows = ci->i_head_snapc->seq; + } else { + follows = 0; + } + + keep = cap->implemented; + seq = cap->seq; + issue_seq = cap->issue_seq; + mseq = cap->mseq; + size = inode->i_size; + ci->i_reported_size = size; + max_size = ci->i_wanted_max_size; + ci->i_requested_max_size = max_size; + mtime = inode->i_mtime; + atime = inode->i_atime; + time_warp_seq = ci->i_time_warp_seq; + uid = inode->i_uid; + gid = inode->i_gid; + mode = inode->i_mode; + + if (flushing & CEPH_CAP_XATTR_EXCL) { + __ceph_build_xattrs_blob(ci); + xattr_blob = ci->i_xattrs.blob; + xattr_version = ci->i_xattrs.version; + } + + inline_data = ci->i_inline_version != CEPH_INLINE_NONE; + + spin_unlock(&ci->i_ceph_lock); + + ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id, + op, keep, want, flushing, seq, flush_tid, issue_seq, mseq, + size, max_size, &mtime, &atime, time_warp_seq, + uid, gid, mode, xattr_version, xattr_blob, + follows, inline_data); + if (ret < 0) { + dout("error sending cap msg, must requeue %p\n", inode); + delayed = 1; + } + + if (wake) + wake_up_all(&ci->i_cap_wq); + + return delayed; +} + +/* + * When a snapshot is taken, clients accumulate dirty metadata on + * inodes with capabilities in ceph_cap_snaps to describe the file + * state at the time the snapshot was taken. This must be flushed + * asynchronously back to the MDS once sync writes complete and dirty + * data is written out. + * + * Unless @again is true, skip cap_snaps that were already sent to + * the MDS (i.e., during this session). + * + * Called under i_ceph_lock. Takes s_mutex as needed. + */ +void __ceph_flush_snaps(struct ceph_inode_info *ci, + struct ceph_mds_session **psession, + int again) + __releases(ci->i_ceph_lock) + __acquires(ci->i_ceph_lock) +{ + struct inode *inode = &ci->vfs_inode; + int mds; + struct ceph_cap_snap *capsnap; + u32 mseq; + struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; + struct ceph_mds_session *session = NULL; /* if session != NULL, we hold + session->s_mutex */ + u64 next_follows = 0; /* keep track of how far we've gotten through the + i_cap_snaps list, and skip these entries next time + around to avoid an infinite loop */ + + if (psession) + session = *psession; + + dout("__flush_snaps %p\n", inode); +retry: + list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { + /* avoid an infiniute loop after retry */ + if (capsnap->follows < next_follows) + continue; + /* + * we need to wait for sync writes to complete and for dirty + * pages to be written out. + */ + if (capsnap->dirty_pages || capsnap->writing) + break; + + /* + * if cap writeback already occurred, we should have dropped + * the capsnap in ceph_put_wrbuffer_cap_refs. + */ + BUG_ON(capsnap->dirty == 0); + + /* pick mds, take s_mutex */ + if (ci->i_auth_cap == NULL) { + dout("no auth cap (migrating?), doing nothing\n"); + goto out; + } + + /* only flush each capsnap once */ + if (!again && !list_empty(&capsnap->flushing_item)) { + dout("already flushed %p, skipping\n", capsnap); + continue; + } + + mds = ci->i_auth_cap->session->s_mds; + mseq = ci->i_auth_cap->mseq; + + if (session && session->s_mds != mds) { + dout("oops, wrong session %p mutex\n", session); + mutex_unlock(&session->s_mutex); + ceph_put_mds_session(session); + session = NULL; + } + if (!session) { + spin_unlock(&ci->i_ceph_lock); + mutex_lock(&mdsc->mutex); + session = __ceph_lookup_mds_session(mdsc, mds); + mutex_unlock(&mdsc->mutex); + if (session) { + dout("inverting session/ino locks on %p\n", + session); + mutex_lock(&session->s_mutex); + } + /* + * if session == NULL, we raced against a cap + * deletion or migration. retry, and we'll + * get a better @mds value next time. + */ + spin_lock(&ci->i_ceph_lock); + goto retry; + } + + capsnap->flush_tid = ++ci->i_cap_flush_last_tid; + atomic_inc(&capsnap->nref); + if (!list_empty(&capsnap->flushing_item)) + list_del_init(&capsnap->flushing_item); + list_add_tail(&capsnap->flushing_item, + &session->s_cap_snaps_flushing); + spin_unlock(&ci->i_ceph_lock); + + dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n", + inode, capsnap, capsnap->follows, capsnap->flush_tid); + send_cap_msg(session, ceph_vino(inode).ino, 0, + CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0, + capsnap->dirty, 0, capsnap->flush_tid, 0, mseq, + capsnap->size, 0, + &capsnap->mtime, &capsnap->atime, + capsnap->time_warp_seq, + capsnap->uid, capsnap->gid, capsnap->mode, + capsnap->xattr_version, capsnap->xattr_blob, + capsnap->follows, capsnap->inline_data); + + next_follows = capsnap->follows + 1; + ceph_put_cap_snap(capsnap); + + spin_lock(&ci->i_ceph_lock); + goto retry; + } + + /* we flushed them all; remove this inode from the queue */ + spin_lock(&mdsc->snap_flush_lock); + list_del_init(&ci->i_snap_flush_item); + spin_unlock(&mdsc->snap_flush_lock); + +out: + if (psession) + *psession = session; + else if (session) { + mutex_unlock(&session->s_mutex); + ceph_put_mds_session(session); + } +} + +static void ceph_flush_snaps(struct ceph_inode_info *ci) +{ + spin_lock(&ci->i_ceph_lock); + __ceph_flush_snaps(ci, NULL, 0); + spin_unlock(&ci->i_ceph_lock); +} + +/* + * Mark caps dirty. If inode is newly dirty, return the dirty flags. + * Caller is then responsible for calling __mark_inode_dirty with the + * returned flags value. + */ +int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask) +{ + struct ceph_mds_client *mdsc = + ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; + struct inode *inode = &ci->vfs_inode; + int was = ci->i_dirty_caps; + int dirty = 0; + + if (!ci->i_auth_cap) { + pr_warn("__mark_dirty_caps %p %llx mask %s, " + "but no auth cap (session was closed?)\n", + inode, ceph_ino(inode), ceph_cap_string(mask)); + return 0; + } + + dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode, + ceph_cap_string(mask), ceph_cap_string(was), + ceph_cap_string(was | mask)); + ci->i_dirty_caps |= mask; + if (was == 0) { + if (!ci->i_head_snapc) + ci->i_head_snapc = ceph_get_snap_context( + ci->i_snap_realm->cached_context); + dout(" inode %p now dirty snapc %p auth cap %p\n", + &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap); + BUG_ON(!list_empty(&ci->i_dirty_item)); + spin_lock(&mdsc->cap_dirty_lock); + list_add(&ci->i_dirty_item, &mdsc->cap_dirty); + spin_unlock(&mdsc->cap_dirty_lock); + if (ci->i_flushing_caps == 0) { + ihold(inode); + dirty |= I_DIRTY_SYNC; + } + } + BUG_ON(list_empty(&ci->i_dirty_item)); + if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) && + (mask & CEPH_CAP_FILE_BUFFER)) + dirty |= I_DIRTY_DATASYNC; + __cap_delay_requeue(mdsc, ci); + return dirty; +} + +/* + * Add dirty inode to the flushing list. Assigned a seq number so we + * can wait for caps to flush without starving. + * + * Called under i_ceph_lock. + */ +static int __mark_caps_flushing(struct inode *inode, + struct ceph_mds_session *session) +{ + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; + struct ceph_inode_info *ci = ceph_inode(inode); + int flushing; + + BUG_ON(ci->i_dirty_caps == 0); + BUG_ON(list_empty(&ci->i_dirty_item)); + + flushing = ci->i_dirty_caps; + dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n", + ceph_cap_string(flushing), + ceph_cap_string(ci->i_flushing_caps), + ceph_cap_string(ci->i_flushing_caps | flushing)); + ci->i_flushing_caps |= flushing; + ci->i_dirty_caps = 0; + dout(" inode %p now !dirty\n", inode); + + spin_lock(&mdsc->cap_dirty_lock); + list_del_init(&ci->i_dirty_item); + + if (list_empty(&ci->i_flushing_item)) { + ci->i_cap_flush_seq = ++mdsc->cap_flush_seq; + list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing); + mdsc->num_cap_flushing++; + dout(" inode %p now flushing seq %lld\n", inode, + ci->i_cap_flush_seq); + } else { + list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing); + dout(" inode %p now flushing (more) seq %lld\n", inode, + ci->i_cap_flush_seq); + } + spin_unlock(&mdsc->cap_dirty_lock); + + return flushing; +} + +/* + * try to invalidate mapping pages without blocking. + */ +static int try_nonblocking_invalidate(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + u32 invalidating_gen = ci->i_rdcache_gen; + + spin_unlock(&ci->i_ceph_lock); + invalidate_mapping_pages(&inode->i_data, 0, -1); + spin_lock(&ci->i_ceph_lock); + + if (inode->i_data.nrpages == 0 && + invalidating_gen == ci->i_rdcache_gen) { + /* success. */ + dout("try_nonblocking_invalidate %p success\n", inode); + /* save any racing async invalidate some trouble */ + ci->i_rdcache_revoking = ci->i_rdcache_gen - 1; + return 0; + } + dout("try_nonblocking_invalidate %p failed\n", inode); + return -1; +} + +/* + * Swiss army knife function to examine currently used and wanted + * versus held caps. Release, flush, ack revoked caps to mds as + * appropriate. + * + * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay + * cap release further. + * CHECK_CAPS_AUTHONLY - we should only check the auth cap + * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without + * further delay. + */ +void ceph_check_caps(struct ceph_inode_info *ci, int flags, + struct ceph_mds_session *session) +{ + struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct inode *inode = &ci->vfs_inode; + struct ceph_cap *cap; + int file_wanted, used, cap_used; + int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */ + int issued, implemented, want, retain, revoking, flushing = 0; + int mds = -1; /* keep track of how far we've gone through i_caps list + to avoid an infinite loop on retry */ + struct rb_node *p; + int tried_invalidate = 0; + int delayed = 0, sent = 0, force_requeue = 0, num; + int queue_invalidate = 0; + int is_delayed = flags & CHECK_CAPS_NODELAY; + + /* if we are unmounting, flush any unused caps immediately. */ + if (mdsc->stopping) + is_delayed = 1; + + spin_lock(&ci->i_ceph_lock); + + if (ci->i_ceph_flags & CEPH_I_FLUSH) + flags |= CHECK_CAPS_FLUSH; + + /* flush snaps first time around only */ + if (!list_empty(&ci->i_cap_snaps)) + __ceph_flush_snaps(ci, &session, 0); + goto retry_locked; +retry: + spin_lock(&ci->i_ceph_lock); +retry_locked: + file_wanted = __ceph_caps_file_wanted(ci); + used = __ceph_caps_used(ci); + want = file_wanted | used; + issued = __ceph_caps_issued(ci, &implemented); + revoking = implemented & ~issued; + + retain = want | CEPH_CAP_PIN; + if (!mdsc->stopping && inode->i_nlink > 0) { + if (want) { + retain |= CEPH_CAP_ANY; /* be greedy */ + } else if (S_ISDIR(inode->i_mode) && + (issued & CEPH_CAP_FILE_SHARED) && + __ceph_dir_is_complete(ci)) { + /* + * If a directory is complete, we want to keep + * the exclusive cap. So that MDS does not end up + * revoking the shared cap on every create/unlink + * operation. + */ + want = CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL; + retain |= want; + } else { + + retain |= CEPH_CAP_ANY_SHARED; + /* + * keep RD only if we didn't have the file open RW, + * because then the mds would revoke it anyway to + * journal max_size=0. + */ + if (ci->i_max_size == 0) + retain |= CEPH_CAP_ANY_RD; + } + } + + dout("check_caps %p file_want %s used %s dirty %s flushing %s" + " issued %s revoking %s retain %s %s%s%s\n", inode, + ceph_cap_string(file_wanted), + ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps), + ceph_cap_string(ci->i_flushing_caps), + ceph_cap_string(issued), ceph_cap_string(revoking), + ceph_cap_string(retain), + (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "", + (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "", + (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : ""); + + /* + * If we no longer need to hold onto old our caps, and we may + * have cached pages, but don't want them, then try to invalidate. + * If we fail, it's because pages are locked.... try again later. + */ + if ((!is_delayed || mdsc->stopping) && + ci->i_wrbuffer_ref == 0 && /* no dirty pages... */ + inode->i_data.nrpages && /* have cached pages */ + (file_wanted == 0 || /* no open files */ + (revoking & (CEPH_CAP_FILE_CACHE| + CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */ + !tried_invalidate) { + dout("check_caps trying to invalidate on %p\n", inode); + if (try_nonblocking_invalidate(inode) < 0) { + if (revoking & (CEPH_CAP_FILE_CACHE| + CEPH_CAP_FILE_LAZYIO)) { + dout("check_caps queuing invalidate\n"); + queue_invalidate = 1; + ci->i_rdcache_revoking = ci->i_rdcache_gen; + } else { + dout("check_caps failed to invalidate pages\n"); + /* we failed to invalidate pages. check these + caps again later. */ + force_requeue = 1; + __cap_set_timeouts(mdsc, ci); + } + } + tried_invalidate = 1; + goto retry_locked; + } + + num = 0; + for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { + cap = rb_entry(p, struct ceph_cap, ci_node); + num++; + + /* avoid looping forever */ + if (mds >= cap->mds || + ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap)) + continue; + + /* NOTE: no side-effects allowed, until we take s_mutex */ + + cap_used = used; + if (ci->i_auth_cap && cap != ci->i_auth_cap) + cap_used &= ~ci->i_auth_cap->issued; + + revoking = cap->implemented & ~cap->issued; + dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n", + cap->mds, cap, ceph_cap_string(cap->issued), + ceph_cap_string(cap_used), + ceph_cap_string(cap->implemented), + ceph_cap_string(revoking)); + + if (cap == ci->i_auth_cap && + (cap->issued & CEPH_CAP_FILE_WR)) { + /* request larger max_size from MDS? */ + if (ci->i_wanted_max_size > ci->i_max_size && + ci->i_wanted_max_size > ci->i_requested_max_size) { + dout("requesting new max_size\n"); + goto ack; + } + + /* approaching file_max? */ + if ((inode->i_size << 1) >= ci->i_max_size && + (ci->i_reported_size << 1) < ci->i_max_size) { + dout("i_size approaching max_size\n"); + goto ack; + } + } + /* flush anything dirty? */ + if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) && + ci->i_dirty_caps) { + dout("flushing dirty caps\n"); + goto ack; + } + + /* completed revocation? going down and there are no caps? */ + if (revoking && (revoking & cap_used) == 0) { + dout("completed revocation of %s\n", + ceph_cap_string(cap->implemented & ~cap->issued)); + goto ack; + } + + /* want more caps from mds? */ + if (want & ~(cap->mds_wanted | cap->issued)) + goto ack; + + /* things we might delay */ + if ((cap->issued & ~retain) == 0 && + cap->mds_wanted == want) + continue; /* nope, all good */ + + if (is_delayed) + goto ack; + + /* delay? */ + if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 && + time_before(jiffies, ci->i_hold_caps_max)) { + dout(" delaying issued %s -> %s, wanted %s -> %s\n", + ceph_cap_string(cap->issued), + ceph_cap_string(cap->issued & retain), + ceph_cap_string(cap->mds_wanted), + ceph_cap_string(want)); + delayed++; + continue; + } + +ack: + if (ci->i_ceph_flags & CEPH_I_NOFLUSH) { + dout(" skipping %p I_NOFLUSH set\n", inode); + continue; + } + + if (session && session != cap->session) { + dout("oops, wrong session %p mutex\n", session); + mutex_unlock(&session->s_mutex); + session = NULL; + } + if (!session) { + session = cap->session; + if (mutex_trylock(&session->s_mutex) == 0) { + dout("inverting session/ino locks on %p\n", + session); + spin_unlock(&ci->i_ceph_lock); + if (took_snap_rwsem) { + up_read(&mdsc->snap_rwsem); + took_snap_rwsem = 0; + } + mutex_lock(&session->s_mutex); + goto retry; + } + } + /* take snap_rwsem after session mutex */ + if (!took_snap_rwsem) { + if (down_read_trylock(&mdsc->snap_rwsem) == 0) { + dout("inverting snap/in locks on %p\n", + inode); + spin_unlock(&ci->i_ceph_lock); + down_read(&mdsc->snap_rwsem); + took_snap_rwsem = 1; + goto retry; + } + took_snap_rwsem = 1; + } + + if (cap == ci->i_auth_cap && ci->i_dirty_caps) + flushing = __mark_caps_flushing(inode, session); + else + flushing = 0; + + mds = cap->mds; /* remember mds, so we don't repeat */ + sent++; + + /* __send_cap drops i_ceph_lock */ + delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used, + want, retain, flushing, NULL); + goto retry; /* retake i_ceph_lock and restart our cap scan. */ + } + + /* + * Reschedule delayed caps release if we delayed anything, + * otherwise cancel. + */ + if (delayed && is_delayed) + force_requeue = 1; /* __send_cap delayed release; requeue */ + if (!delayed && !is_delayed) + __cap_delay_cancel(mdsc, ci); + else if (!is_delayed || force_requeue) + __cap_delay_requeue(mdsc, ci); + + spin_unlock(&ci->i_ceph_lock); + + if (queue_invalidate) + ceph_queue_invalidate(inode); + + if (session) + mutex_unlock(&session->s_mutex); + if (took_snap_rwsem) + up_read(&mdsc->snap_rwsem); +} + +/* + * Try to flush dirty caps back to the auth mds. + */ +static int try_flush_caps(struct inode *inode, unsigned *flush_tid) +{ + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; + struct ceph_inode_info *ci = ceph_inode(inode); + int flushing = 0; + struct ceph_mds_session *session = NULL; + +retry: + spin_lock(&ci->i_ceph_lock); + if (ci->i_ceph_flags & CEPH_I_NOFLUSH) { + dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode); + goto out; + } + if (ci->i_dirty_caps && ci->i_auth_cap) { + struct ceph_cap *cap = ci->i_auth_cap; + int used = __ceph_caps_used(ci); + int want = __ceph_caps_wanted(ci); + int delayed; + + if (!session || session != cap->session) { + spin_unlock(&ci->i_ceph_lock); + if (session) + mutex_unlock(&session->s_mutex); + session = cap->session; + mutex_lock(&session->s_mutex); + goto retry; + } + if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) + goto out; + + flushing = __mark_caps_flushing(inode, session); + + /* __send_cap drops i_ceph_lock */ + delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want, + cap->issued | cap->implemented, flushing, + flush_tid); + if (!delayed) + goto out_unlocked; + + spin_lock(&ci->i_ceph_lock); + __cap_delay_requeue(mdsc, ci); + } +out: + spin_unlock(&ci->i_ceph_lock); +out_unlocked: + if (session) + mutex_unlock(&session->s_mutex); + return flushing; +} + +/* + * Return true if we've flushed caps through the given flush_tid. + */ +static int caps_are_flushed(struct inode *inode, unsigned tid) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int i, ret = 1; + + spin_lock(&ci->i_ceph_lock); + for (i = 0; i < CEPH_CAP_BITS; i++) + if ((ci->i_flushing_caps & (1 << i)) && + ci->i_cap_flush_tid[i] <= tid) { + /* still flushing this bit */ + ret = 0; + break; + } + spin_unlock(&ci->i_ceph_lock); + return ret; +} + +/* + * Wait on any unsafe replies for the given inode. First wait on the + * newest request, and make that the upper bound. Then, if there are + * more requests, keep waiting on the oldest as long as it is still older + * than the original request. + */ +static void sync_write_wait(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct list_head *head = &ci->i_unsafe_writes; + struct ceph_osd_request *req; + u64 last_tid; + + spin_lock(&ci->i_unsafe_lock); + if (list_empty(head)) + goto out; + + /* set upper bound as _last_ entry in chain */ + req = list_entry(head->prev, struct ceph_osd_request, + r_unsafe_item); + last_tid = req->r_tid; + + do { + ceph_osdc_get_request(req); + spin_unlock(&ci->i_unsafe_lock); + dout("sync_write_wait on tid %llu (until %llu)\n", + req->r_tid, last_tid); + wait_for_completion(&req->r_safe_completion); + spin_lock(&ci->i_unsafe_lock); + ceph_osdc_put_request(req); + + /* + * from here on look at first entry in chain, since we + * only want to wait for anything older than last_tid + */ + if (list_empty(head)) + break; + req = list_entry(head->next, struct ceph_osd_request, + r_unsafe_item); + } while (req->r_tid < last_tid); +out: + spin_unlock(&ci->i_unsafe_lock); +} + +int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync) +{ + struct inode *inode = file->f_mapping->host; + struct ceph_inode_info *ci = ceph_inode(inode); + unsigned flush_tid; + int ret; + int dirty; + + dout("fsync %p%s\n", inode, datasync ? " datasync" : ""); + sync_write_wait(inode); + + ret = filemap_write_and_wait_range(inode->i_mapping, start, end); + if (ret < 0) + return ret; + mutex_lock(&inode->i_mutex); + + dirty = try_flush_caps(inode, &flush_tid); + dout("fsync dirty caps are %s\n", ceph_cap_string(dirty)); + + /* + * only wait on non-file metadata writeback (the mds + * can recover size and mtime, so we don't need to + * wait for that) + */ + if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) { + dout("fsync waiting for flush_tid %u\n", flush_tid); + ret = wait_event_interruptible(ci->i_cap_wq, + caps_are_flushed(inode, flush_tid)); + } + + dout("fsync %p%s done\n", inode, datasync ? " datasync" : ""); + mutex_unlock(&inode->i_mutex); + return ret; +} + +/* + * Flush any dirty caps back to the mds. If we aren't asked to wait, + * queue inode for flush but don't do so immediately, because we can + * get by with fewer MDS messages if we wait for data writeback to + * complete first. + */ +int ceph_write_inode(struct inode *inode, struct writeback_control *wbc) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + unsigned flush_tid; + int err = 0; + int dirty; + int wait = wbc->sync_mode == WB_SYNC_ALL; + + dout("write_inode %p wait=%d\n", inode, wait); + if (wait) { + dirty = try_flush_caps(inode, &flush_tid); + if (dirty) + err = wait_event_interruptible(ci->i_cap_wq, + caps_are_flushed(inode, flush_tid)); + } else { + struct ceph_mds_client *mdsc = + ceph_sb_to_client(inode->i_sb)->mdsc; + + spin_lock(&ci->i_ceph_lock); + if (__ceph_caps_dirty(ci)) + __cap_delay_requeue_front(mdsc, ci); + spin_unlock(&ci->i_ceph_lock); + } + return err; +} + +/* + * After a recovering MDS goes active, we need to resend any caps + * we were flushing. + * + * Caller holds session->s_mutex. + */ +static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_cap_snap *capsnap; + + dout("kick_flushing_capsnaps mds%d\n", session->s_mds); + list_for_each_entry(capsnap, &session->s_cap_snaps_flushing, + flushing_item) { + struct ceph_inode_info *ci = capsnap->ci; + struct inode *inode = &ci->vfs_inode; + struct ceph_cap *cap; + + spin_lock(&ci->i_ceph_lock); + cap = ci->i_auth_cap; + if (cap && cap->session == session) { + dout("kick_flushing_caps %p cap %p capsnap %p\n", inode, + cap, capsnap); + __ceph_flush_snaps(ci, &session, 1); + } else { + pr_err("%p auth cap %p not mds%d ???\n", inode, + cap, session->s_mds); + } + spin_unlock(&ci->i_ceph_lock); + } +} + +void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_inode_info *ci; + + kick_flushing_capsnaps(mdsc, session); + + dout("kick_flushing_caps mds%d\n", session->s_mds); + list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) { + struct inode *inode = &ci->vfs_inode; + struct ceph_cap *cap; + int delayed = 0; + + spin_lock(&ci->i_ceph_lock); + cap = ci->i_auth_cap; + if (cap && cap->session == session) { + dout("kick_flushing_caps %p cap %p %s\n", inode, + cap, ceph_cap_string(ci->i_flushing_caps)); + delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, + __ceph_caps_used(ci), + __ceph_caps_wanted(ci), + cap->issued | cap->implemented, + ci->i_flushing_caps, NULL); + if (delayed) { + spin_lock(&ci->i_ceph_lock); + __cap_delay_requeue(mdsc, ci); + spin_unlock(&ci->i_ceph_lock); + } + } else { + pr_err("%p auth cap %p not mds%d ???\n", inode, + cap, session->s_mds); + spin_unlock(&ci->i_ceph_lock); + } + } +} + +static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session, + struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_cap *cap; + int delayed = 0; + + spin_lock(&ci->i_ceph_lock); + cap = ci->i_auth_cap; + dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode, + ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq); + + __ceph_flush_snaps(ci, &session, 1); + + if (ci->i_flushing_caps) { + spin_lock(&mdsc->cap_dirty_lock); + list_move_tail(&ci->i_flushing_item, + &cap->session->s_cap_flushing); + spin_unlock(&mdsc->cap_dirty_lock); + + delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, + __ceph_caps_used(ci), + __ceph_caps_wanted(ci), + cap->issued | cap->implemented, + ci->i_flushing_caps, NULL); + if (delayed) { + spin_lock(&ci->i_ceph_lock); + __cap_delay_requeue(mdsc, ci); + spin_unlock(&ci->i_ceph_lock); + } + } else { + spin_unlock(&ci->i_ceph_lock); + } +} + + +/* + * Take references to capabilities we hold, so that we don't release + * them to the MDS prematurely. + * + * Protected by i_ceph_lock. + */ +static void __take_cap_refs(struct ceph_inode_info *ci, int got) +{ + if (got & CEPH_CAP_PIN) + ci->i_pin_ref++; + if (got & CEPH_CAP_FILE_RD) + ci->i_rd_ref++; + if (got & CEPH_CAP_FILE_CACHE) + ci->i_rdcache_ref++; + if (got & CEPH_CAP_FILE_WR) + ci->i_wr_ref++; + if (got & CEPH_CAP_FILE_BUFFER) { + if (ci->i_wb_ref == 0) + ihold(&ci->vfs_inode); + ci->i_wb_ref++; + dout("__take_cap_refs %p wb %d -> %d (?)\n", + &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref); + } +} + +/* + * Try to grab cap references. Specify those refs we @want, and the + * minimal set we @need. Also include the larger offset we are writing + * to (when applicable), and check against max_size here as well. + * Note that caller is responsible for ensuring max_size increases are + * requested from the MDS. + */ +static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want, + loff_t endoff, int *got, int *check_max, int *err) +{ + struct inode *inode = &ci->vfs_inode; + int ret = 0; + int have, implemented; + int file_wanted; + + dout("get_cap_refs %p need %s want %s\n", inode, + ceph_cap_string(need), ceph_cap_string(want)); + + spin_lock(&ci->i_ceph_lock); + + /* make sure file is actually open */ + file_wanted = __ceph_caps_file_wanted(ci); + if ((file_wanted & need) == 0) { + dout("try_get_cap_refs need %s file_wanted %s, EBADF\n", + ceph_cap_string(need), ceph_cap_string(file_wanted)); + *err = -EBADF; + ret = 1; + goto out_unlock; + } + + /* finish pending truncate */ + while (ci->i_truncate_pending) { + spin_unlock(&ci->i_ceph_lock); + __ceph_do_pending_vmtruncate(inode); + spin_lock(&ci->i_ceph_lock); + } + + have = __ceph_caps_issued(ci, &implemented); + + if (have & need & CEPH_CAP_FILE_WR) { + if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) { + dout("get_cap_refs %p endoff %llu > maxsize %llu\n", + inode, endoff, ci->i_max_size); + if (endoff > ci->i_requested_max_size) { + *check_max = 1; + ret = 1; + } + goto out_unlock; + } + /* + * If a sync write is in progress, we must wait, so that we + * can get a final snapshot value for size+mtime. + */ + if (__ceph_have_pending_cap_snap(ci)) { + dout("get_cap_refs %p cap_snap_pending\n", inode); + goto out_unlock; + } + } + + if ((have & need) == need) { + /* + * Look at (implemented & ~have & not) so that we keep waiting + * on transition from wanted -> needed caps. This is needed + * for WRBUFFER|WR -> WR to avoid a new WR sync write from + * going before a prior buffered writeback happens. + */ + int not = want & ~(have & need); + int revoking = implemented & ~have; + dout("get_cap_refs %p have %s but not %s (revoking %s)\n", + inode, ceph_cap_string(have), ceph_cap_string(not), + ceph_cap_string(revoking)); + if ((revoking & not) == 0) { + *got = need | (have & want); + __take_cap_refs(ci, *got); + ret = 1; + } + } else { + int session_readonly = false; + if ((need & CEPH_CAP_FILE_WR) && ci->i_auth_cap) { + struct ceph_mds_session *s = ci->i_auth_cap->session; + spin_lock(&s->s_cap_lock); + session_readonly = s->s_readonly; + spin_unlock(&s->s_cap_lock); + } + if (session_readonly) { + dout("get_cap_refs %p needed %s but mds%d readonly\n", + inode, ceph_cap_string(need), ci->i_auth_cap->mds); + *err = -EROFS; + ret = 1; + goto out_unlock; + } + + dout("get_cap_refs %p have %s needed %s\n", inode, + ceph_cap_string(have), ceph_cap_string(need)); + } +out_unlock: + spin_unlock(&ci->i_ceph_lock); + + dout("get_cap_refs %p ret %d got %s\n", inode, + ret, ceph_cap_string(*got)); + return ret; +} + +/* + * Check the offset we are writing up to against our current + * max_size. If necessary, tell the MDS we want to write to + * a larger offset. + */ +static void check_max_size(struct inode *inode, loff_t endoff) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int check = 0; + + /* do we need to explicitly request a larger max_size? */ + spin_lock(&ci->i_ceph_lock); + if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) { + dout("write %p at large endoff %llu, req max_size\n", + inode, endoff); + ci->i_wanted_max_size = endoff; + } + /* duplicate ceph_check_caps()'s logic */ + if (ci->i_auth_cap && + (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) && + ci->i_wanted_max_size > ci->i_max_size && + ci->i_wanted_max_size > ci->i_requested_max_size) + check = 1; + spin_unlock(&ci->i_ceph_lock); + if (check) + ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); +} + +/* + * Wait for caps, and take cap references. If we can't get a WR cap + * due to a small max_size, make sure we check_max_size (and possibly + * ask the mds) so we don't get hung up indefinitely. + */ +int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, + loff_t endoff, int *got, struct page **pinned_page) +{ + int _got, check_max, ret, err = 0; + +retry: + if (endoff > 0) + check_max_size(&ci->vfs_inode, endoff); + _got = 0; + check_max = 0; + ret = wait_event_interruptible(ci->i_cap_wq, + try_get_cap_refs(ci, need, want, endoff, + &_got, &check_max, &err)); + if (err) + ret = err; + if (ret < 0) + return ret; + + if (check_max) + goto retry; + + if (ci->i_inline_version != CEPH_INLINE_NONE && + (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && + i_size_read(&ci->vfs_inode) > 0) { + struct page *page = find_get_page(ci->vfs_inode.i_mapping, 0); + if (page) { + if (PageUptodate(page)) { + *pinned_page = page; + goto out; + } + page_cache_release(page); + } + /* + * drop cap refs first because getattr while holding + * caps refs can cause deadlock. + */ + ceph_put_cap_refs(ci, _got); + _got = 0; + + /* getattr request will bring inline data into page cache */ + ret = __ceph_do_getattr(&ci->vfs_inode, NULL, + CEPH_STAT_CAP_INLINE_DATA, true); + if (ret < 0) + return ret; + goto retry; + } +out: + *got = _got; + return 0; +} + +/* + * Take cap refs. Caller must already know we hold at least one ref + * on the caps in question or we don't know this is safe. + */ +void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps) +{ + spin_lock(&ci->i_ceph_lock); + __take_cap_refs(ci, caps); + spin_unlock(&ci->i_ceph_lock); +} + +/* + * Release cap refs. + * + * If we released the last ref on any given cap, call ceph_check_caps + * to release (or schedule a release). + * + * If we are releasing a WR cap (from a sync write), finalize any affected + * cap_snap, and wake up any waiters. + */ +void ceph_put_cap_refs(struct ceph_inode_info *ci, int had) +{ + struct inode *inode = &ci->vfs_inode; + int last = 0, put = 0, flushsnaps = 0, wake = 0; + struct ceph_cap_snap *capsnap; + + spin_lock(&ci->i_ceph_lock); + if (had & CEPH_CAP_PIN) + --ci->i_pin_ref; + if (had & CEPH_CAP_FILE_RD) + if (--ci->i_rd_ref == 0) + last++; + if (had & CEPH_CAP_FILE_CACHE) + if (--ci->i_rdcache_ref == 0) + last++; + if (had & CEPH_CAP_FILE_BUFFER) { + if (--ci->i_wb_ref == 0) { + last++; + put++; + } + dout("put_cap_refs %p wb %d -> %d (?)\n", + inode, ci->i_wb_ref+1, ci->i_wb_ref); + } + if (had & CEPH_CAP_FILE_WR) + if (--ci->i_wr_ref == 0) { + last++; + if (!list_empty(&ci->i_cap_snaps)) { + capsnap = list_first_entry(&ci->i_cap_snaps, + struct ceph_cap_snap, + ci_item); + if (capsnap->writing) { + capsnap->writing = 0; + flushsnaps = + __ceph_finish_cap_snap(ci, + capsnap); + wake = 1; + } + } + /* see comment in __ceph_remove_cap() */ + if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) + drop_inode_snap_realm(ci); + } + spin_unlock(&ci->i_ceph_lock); + + dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had), + last ? " last" : "", put ? " put" : ""); + + if (last && !flushsnaps) + ceph_check_caps(ci, 0, NULL); + else if (flushsnaps) + ceph_flush_snaps(ci); + if (wake) + wake_up_all(&ci->i_cap_wq); + if (put) + iput(inode); +} + +/* + * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap + * context. Adjust per-snap dirty page accounting as appropriate. + * Once all dirty data for a cap_snap is flushed, flush snapped file + * metadata back to the MDS. If we dropped the last ref, call + * ceph_check_caps. + */ +void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, + struct ceph_snap_context *snapc) +{ + struct inode *inode = &ci->vfs_inode; + int last = 0; + int complete_capsnap = 0; + int drop_capsnap = 0; + int found = 0; + struct ceph_cap_snap *capsnap = NULL; + + spin_lock(&ci->i_ceph_lock); + ci->i_wrbuffer_ref -= nr; + last = !ci->i_wrbuffer_ref; + + if (ci->i_head_snapc == snapc) { + ci->i_wrbuffer_ref_head -= nr; + if (ci->i_wrbuffer_ref_head == 0 && + ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) { + BUG_ON(!ci->i_head_snapc); + ceph_put_snap_context(ci->i_head_snapc); + ci->i_head_snapc = NULL; + } + dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n", + inode, + ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr, + ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, + last ? " LAST" : ""); + } else { + list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { + if (capsnap->context == snapc) { + found = 1; + break; + } + } + BUG_ON(!found); + capsnap->dirty_pages -= nr; + if (capsnap->dirty_pages == 0) { + complete_capsnap = 1; + if (capsnap->dirty == 0) + /* cap writeback completed before we created + * the cap_snap; no FLUSHSNAP is needed */ + drop_capsnap = 1; + } + dout("put_wrbuffer_cap_refs on %p cap_snap %p " + " snap %lld %d/%d -> %d/%d %s%s%s\n", + inode, capsnap, capsnap->context->seq, + ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr, + ci->i_wrbuffer_ref, capsnap->dirty_pages, + last ? " (wrbuffer last)" : "", + complete_capsnap ? " (complete capsnap)" : "", + drop_capsnap ? " (drop capsnap)" : ""); + if (drop_capsnap) { + ceph_put_snap_context(capsnap->context); + list_del(&capsnap->ci_item); + list_del(&capsnap->flushing_item); + ceph_put_cap_snap(capsnap); + } + } + + spin_unlock(&ci->i_ceph_lock); + + if (last) { + ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); + iput(inode); + } else if (complete_capsnap) { + ceph_flush_snaps(ci); + wake_up_all(&ci->i_cap_wq); + } + if (drop_capsnap) + iput(inode); +} + +/* + * Invalidate unlinked inode's aliases, so we can drop the inode ASAP. + */ +static void invalidate_aliases(struct inode *inode) +{ + struct dentry *dn, *prev = NULL; + + dout("invalidate_aliases inode %p\n", inode); + d_prune_aliases(inode); + /* + * For non-directory inode, d_find_alias() only returns + * hashed dentry. After calling d_invalidate(), the + * dentry becomes unhashed. + * + * For directory inode, d_find_alias() can return + * unhashed dentry. But directory inode should have + * one alias at most. + */ + while ((dn = d_find_alias(inode))) { + if (dn == prev) { + dput(dn); + break; + } + d_invalidate(dn); + if (prev) + dput(prev); + prev = dn; + } + if (prev) + dput(prev); +} + +/* + * Handle a cap GRANT message from the MDS. (Note that a GRANT may + * actually be a revocation if it specifies a smaller cap set.) + * + * caller holds s_mutex and i_ceph_lock, we drop both. + */ +static void handle_cap_grant(struct ceph_mds_client *mdsc, + struct inode *inode, struct ceph_mds_caps *grant, + u64 inline_version, + void *inline_data, int inline_len, + struct ceph_buffer *xattr_buf, + struct ceph_mds_session *session, + struct ceph_cap *cap, int issued) + __releases(ci->i_ceph_lock) + __releases(mdsc->snap_rwsem) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int mds = session->s_mds; + int seq = le32_to_cpu(grant->seq); + int newcaps = le32_to_cpu(grant->caps); + int used, wanted, dirty; + u64 size = le64_to_cpu(grant->size); + u64 max_size = le64_to_cpu(grant->max_size); + struct timespec mtime, atime, ctime; + int check_caps = 0; + bool wake = false; + bool writeback = false; + bool queue_trunc = false; + bool queue_invalidate = false; + bool queue_revalidate = false; + bool deleted_inode = false; + bool fill_inline = false; + + dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n", + inode, cap, mds, seq, ceph_cap_string(newcaps)); + dout(" size %llu max_size %llu, i_size %llu\n", size, max_size, + inode->i_size); + + + /* + * auth mds of the inode changed. we received the cap export message, + * but still haven't received the cap import message. handle_cap_export + * updated the new auth MDS' cap. + * + * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message + * that was sent before the cap import message. So don't remove caps. + */ + if (ceph_seq_cmp(seq, cap->seq) <= 0) { + WARN_ON(cap != ci->i_auth_cap); + WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id)); + seq = cap->seq; + newcaps |= cap->issued; + } + + /* + * If CACHE is being revoked, and we have no dirty buffers, + * try to invalidate (once). (If there are dirty buffers, we + * will invalidate _after_ writeback.) + */ + if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) && + (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && + !ci->i_wrbuffer_ref) { + if (try_nonblocking_invalidate(inode)) { + /* there were locked pages.. invalidate later + in a separate thread. */ + if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { + queue_invalidate = true; + ci->i_rdcache_revoking = ci->i_rdcache_gen; + } + } + + ceph_fscache_invalidate(inode); + } + + /* side effects now are allowed */ + cap->cap_gen = session->s_cap_gen; + cap->seq = seq; + + __check_cap_issue(ci, cap, newcaps); + + if ((newcaps & CEPH_CAP_AUTH_SHARED) && + (issued & CEPH_CAP_AUTH_EXCL) == 0) { + inode->i_mode = le32_to_cpu(grant->mode); + inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid)); + inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid)); + dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, + from_kuid(&init_user_ns, inode->i_uid), + from_kgid(&init_user_ns, inode->i_gid)); + } + + if ((newcaps & CEPH_CAP_AUTH_SHARED) && + (issued & CEPH_CAP_LINK_EXCL) == 0) { + set_nlink(inode, le32_to_cpu(grant->nlink)); + if (inode->i_nlink == 0 && + (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL))) + deleted_inode = true; + } + + if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) { + int len = le32_to_cpu(grant->xattr_len); + u64 version = le64_to_cpu(grant->xattr_version); + + if (version > ci->i_xattrs.version) { + dout(" got new xattrs v%llu on %p len %d\n", + version, inode, len); + if (ci->i_xattrs.blob) + ceph_buffer_put(ci->i_xattrs.blob); + ci->i_xattrs.blob = ceph_buffer_get(xattr_buf); + ci->i_xattrs.version = version; + ceph_forget_all_cached_acls(inode); + } + } + + /* Do we need to revalidate our fscache cookie. Don't bother on the + * first cache cap as we already validate at cookie creation time. */ + if ((issued & CEPH_CAP_FILE_CACHE) && ci->i_rdcache_gen > 1) + queue_revalidate = true; + + if (newcaps & CEPH_CAP_ANY_RD) { + /* ctime/mtime/atime? */ + ceph_decode_timespec(&mtime, &grant->mtime); + ceph_decode_timespec(&atime, &grant->atime); + ceph_decode_timespec(&ctime, &grant->ctime); + ceph_fill_file_time(inode, issued, + le32_to_cpu(grant->time_warp_seq), + &ctime, &mtime, &atime); + } + + if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) { + /* file layout may have changed */ + ci->i_layout = grant->layout; + /* size/truncate_seq? */ + queue_trunc = ceph_fill_file_size(inode, issued, + le32_to_cpu(grant->truncate_seq), + le64_to_cpu(grant->truncate_size), + size); + /* max size increase? */ + if (ci->i_auth_cap == cap && max_size != ci->i_max_size) { + dout("max_size %lld -> %llu\n", + ci->i_max_size, max_size); + ci->i_max_size = max_size; + if (max_size >= ci->i_wanted_max_size) { + ci->i_wanted_max_size = 0; /* reset */ + ci->i_requested_max_size = 0; + } + wake = true; + } + } + + /* check cap bits */ + wanted = __ceph_caps_wanted(ci); + used = __ceph_caps_used(ci); + dirty = __ceph_caps_dirty(ci); + dout(" my wanted = %s, used = %s, dirty %s\n", + ceph_cap_string(wanted), + ceph_cap_string(used), + ceph_cap_string(dirty)); + if (wanted != le32_to_cpu(grant->wanted)) { + dout("mds wanted %s -> %s\n", + ceph_cap_string(le32_to_cpu(grant->wanted)), + ceph_cap_string(wanted)); + /* imported cap may not have correct mds_wanted */ + if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) + check_caps = 1; + } + + /* revocation, grant, or no-op? */ + if (cap->issued & ~newcaps) { + int revoking = cap->issued & ~newcaps; + + dout("revocation: %s -> %s (revoking %s)\n", + ceph_cap_string(cap->issued), + ceph_cap_string(newcaps), + ceph_cap_string(revoking)); + if (revoking & used & CEPH_CAP_FILE_BUFFER) + writeback = true; /* initiate writeback; will delay ack */ + else if (revoking == CEPH_CAP_FILE_CACHE && + (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && + queue_invalidate) + ; /* do nothing yet, invalidation will be queued */ + else if (cap == ci->i_auth_cap) + check_caps = 1; /* check auth cap only */ + else + check_caps = 2; /* check all caps */ + cap->issued = newcaps; + cap->implemented |= newcaps; + } else if (cap->issued == newcaps) { + dout("caps unchanged: %s -> %s\n", + ceph_cap_string(cap->issued), ceph_cap_string(newcaps)); + } else { + dout("grant: %s -> %s\n", ceph_cap_string(cap->issued), + ceph_cap_string(newcaps)); + /* non-auth MDS is revoking the newly grant caps ? */ + if (cap == ci->i_auth_cap && + __ceph_caps_revoking_other(ci, cap, newcaps)) + check_caps = 2; + + cap->issued = newcaps; + cap->implemented |= newcaps; /* add bits only, to + * avoid stepping on a + * pending revocation */ + wake = true; + } + BUG_ON(cap->issued & ~cap->implemented); + + if (inline_version > 0 && inline_version >= ci->i_inline_version) { + ci->i_inline_version = inline_version; + if (ci->i_inline_version != CEPH_INLINE_NONE && + (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO))) + fill_inline = true; + } + + spin_unlock(&ci->i_ceph_lock); + + if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) { + kick_flushing_inode_caps(mdsc, session, inode); + up_read(&mdsc->snap_rwsem); + if (newcaps & ~issued) + wake = true; + } + + if (fill_inline) + ceph_fill_inline_data(inode, NULL, inline_data, inline_len); + + if (queue_trunc) { + ceph_queue_vmtruncate(inode); + ceph_queue_revalidate(inode); + } else if (queue_revalidate) + ceph_queue_revalidate(inode); + + if (writeback) + /* + * queue inode for writeback: we can't actually call + * filemap_write_and_wait, etc. from message handler + * context. + */ + ceph_queue_writeback(inode); + if (queue_invalidate) + ceph_queue_invalidate(inode); + if (deleted_inode) + invalidate_aliases(inode); + if (wake) + wake_up_all(&ci->i_cap_wq); + + if (check_caps == 1) + ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY, + session); + else if (check_caps == 2) + ceph_check_caps(ci, CHECK_CAPS_NODELAY, session); + else + mutex_unlock(&session->s_mutex); +} + +/* + * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the + * MDS has been safely committed. + */ +static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid, + struct ceph_mds_caps *m, + struct ceph_mds_session *session, + struct ceph_cap *cap) + __releases(ci->i_ceph_lock) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; + unsigned seq = le32_to_cpu(m->seq); + int dirty = le32_to_cpu(m->dirty); + int cleaned = 0; + int drop = 0; + int i; + + for (i = 0; i < CEPH_CAP_BITS; i++) + if ((dirty & (1 << i)) && + (u16)flush_tid == ci->i_cap_flush_tid[i]) + cleaned |= 1 << i; + + dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s," + " flushing %s -> %s\n", + inode, session->s_mds, seq, ceph_cap_string(dirty), + ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps), + ceph_cap_string(ci->i_flushing_caps & ~cleaned)); + + if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned)) + goto out; + + ci->i_flushing_caps &= ~cleaned; + + spin_lock(&mdsc->cap_dirty_lock); + if (ci->i_flushing_caps == 0) { + list_del_init(&ci->i_flushing_item); + if (!list_empty(&session->s_cap_flushing)) + dout(" mds%d still flushing cap on %p\n", + session->s_mds, + &list_entry(session->s_cap_flushing.next, + struct ceph_inode_info, + i_flushing_item)->vfs_inode); + mdsc->num_cap_flushing--; + wake_up_all(&mdsc->cap_flushing_wq); + dout(" inode %p now !flushing\n", inode); + + if (ci->i_dirty_caps == 0) { + dout(" inode %p now clean\n", inode); + BUG_ON(!list_empty(&ci->i_dirty_item)); + drop = 1; + if (ci->i_wrbuffer_ref_head == 0) { + BUG_ON(!ci->i_head_snapc); + ceph_put_snap_context(ci->i_head_snapc); + ci->i_head_snapc = NULL; + } + } else { + BUG_ON(list_empty(&ci->i_dirty_item)); + } + } + spin_unlock(&mdsc->cap_dirty_lock); + wake_up_all(&ci->i_cap_wq); + +out: + spin_unlock(&ci->i_ceph_lock); + if (drop) + iput(inode); +} + +/* + * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can + * throw away our cap_snap. + * + * Caller hold s_mutex. + */ +static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid, + struct ceph_mds_caps *m, + struct ceph_mds_session *session) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + u64 follows = le64_to_cpu(m->snap_follows); + struct ceph_cap_snap *capsnap; + int drop = 0; + + dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n", + inode, ci, session->s_mds, follows); + + spin_lock(&ci->i_ceph_lock); + list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { + if (capsnap->follows == follows) { + if (capsnap->flush_tid != flush_tid) { + dout(" cap_snap %p follows %lld tid %lld !=" + " %lld\n", capsnap, follows, + flush_tid, capsnap->flush_tid); + break; + } + WARN_ON(capsnap->dirty_pages || capsnap->writing); + dout(" removing %p cap_snap %p follows %lld\n", + inode, capsnap, follows); + ceph_put_snap_context(capsnap->context); + list_del(&capsnap->ci_item); + list_del(&capsnap->flushing_item); + ceph_put_cap_snap(capsnap); + drop = 1; + break; + } else { + dout(" skipping cap_snap %p follows %lld\n", + capsnap, capsnap->follows); + } + } + spin_unlock(&ci->i_ceph_lock); + if (drop) + iput(inode); +} + +/* + * Handle TRUNC from MDS, indicating file truncation. + * + * caller hold s_mutex. + */ +static void handle_cap_trunc(struct inode *inode, + struct ceph_mds_caps *trunc, + struct ceph_mds_session *session) + __releases(ci->i_ceph_lock) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int mds = session->s_mds; + int seq = le32_to_cpu(trunc->seq); + u32 truncate_seq = le32_to_cpu(trunc->truncate_seq); + u64 truncate_size = le64_to_cpu(trunc->truncate_size); + u64 size = le64_to_cpu(trunc->size); + int implemented = 0; + int dirty = __ceph_caps_dirty(ci); + int issued = __ceph_caps_issued(ceph_inode(inode), &implemented); + int queue_trunc = 0; + + issued |= implemented | dirty; + + dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n", + inode, mds, seq, truncate_size, truncate_seq); + queue_trunc = ceph_fill_file_size(inode, issued, + truncate_seq, truncate_size, size); + spin_unlock(&ci->i_ceph_lock); + + if (queue_trunc) { + ceph_queue_vmtruncate(inode); + ceph_fscache_invalidate(inode); + } +} + +/* + * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a + * different one. If we are the most recent migration we've seen (as + * indicated by mseq), make note of the migrating cap bits for the + * duration (until we see the corresponding IMPORT). + * + * caller holds s_mutex + */ +static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex, + struct ceph_mds_cap_peer *ph, + struct ceph_mds_session *session) +{ + struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; + struct ceph_mds_session *tsession = NULL; + struct ceph_cap *cap, *tcap, *new_cap = NULL; + struct ceph_inode_info *ci = ceph_inode(inode); + u64 t_cap_id; + unsigned mseq = le32_to_cpu(ex->migrate_seq); + unsigned t_seq, t_mseq; + int target, issued; + int mds = session->s_mds; + + if (ph) { + t_cap_id = le64_to_cpu(ph->cap_id); + t_seq = le32_to_cpu(ph->seq); + t_mseq = le32_to_cpu(ph->mseq); + target = le32_to_cpu(ph->mds); + } else { + t_cap_id = t_seq = t_mseq = 0; + target = -1; + } + + dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n", + inode, ci, mds, mseq, target); +retry: + spin_lock(&ci->i_ceph_lock); + cap = __get_cap_for_mds(ci, mds); + if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id)) + goto out_unlock; + + if (target < 0) { + __ceph_remove_cap(cap, false); + goto out_unlock; + } + + /* + * now we know we haven't received the cap import message yet + * because the exported cap still exist. + */ + + issued = cap->issued; + WARN_ON(issued != cap->implemented); + + tcap = __get_cap_for_mds(ci, target); + if (tcap) { + /* already have caps from the target */ + if (tcap->cap_id != t_cap_id || + ceph_seq_cmp(tcap->seq, t_seq) < 0) { + dout(" updating import cap %p mds%d\n", tcap, target); + tcap->cap_id = t_cap_id; + tcap->seq = t_seq - 1; + tcap->issue_seq = t_seq - 1; + tcap->mseq = t_mseq; + tcap->issued |= issued; + tcap->implemented |= issued; + if (cap == ci->i_auth_cap) + ci->i_auth_cap = tcap; + if (ci->i_flushing_caps && ci->i_auth_cap == tcap) { + spin_lock(&mdsc->cap_dirty_lock); + list_move_tail(&ci->i_flushing_item, + &tcap->session->s_cap_flushing); + spin_unlock(&mdsc->cap_dirty_lock); + } + } + __ceph_remove_cap(cap, false); + goto out_unlock; + } else if (tsession) { + /* add placeholder for the export tagert */ + int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0; + ceph_add_cap(inode, tsession, t_cap_id, -1, issued, 0, + t_seq - 1, t_mseq, (u64)-1, flag, &new_cap); + + __ceph_remove_cap(cap, false); + goto out_unlock; + } + + spin_unlock(&ci->i_ceph_lock); + mutex_unlock(&session->s_mutex); + + /* open target session */ + tsession = ceph_mdsc_open_export_target_session(mdsc, target); + if (!IS_ERR(tsession)) { + if (mds > target) { + mutex_lock(&session->s_mutex); + mutex_lock_nested(&tsession->s_mutex, + SINGLE_DEPTH_NESTING); + } else { + mutex_lock(&tsession->s_mutex); + mutex_lock_nested(&session->s_mutex, + SINGLE_DEPTH_NESTING); + } + ceph_add_cap_releases(mdsc, tsession); + new_cap = ceph_get_cap(mdsc, NULL); + } else { + WARN_ON(1); + tsession = NULL; + target = -1; + } + goto retry; + +out_unlock: + spin_unlock(&ci->i_ceph_lock); + mutex_unlock(&session->s_mutex); + if (tsession) { + mutex_unlock(&tsession->s_mutex); + ceph_put_mds_session(tsession); + } + if (new_cap) + ceph_put_cap(mdsc, new_cap); +} + +/* + * Handle cap IMPORT. + * + * caller holds s_mutex. acquires i_ceph_lock + */ +static void handle_cap_import(struct ceph_mds_client *mdsc, + struct inode *inode, struct ceph_mds_caps *im, + struct ceph_mds_cap_peer *ph, + struct ceph_mds_session *session, + struct ceph_cap **target_cap, int *old_issued) + __acquires(ci->i_ceph_lock) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_cap *cap, *ocap, *new_cap = NULL; + int mds = session->s_mds; + int issued; + unsigned caps = le32_to_cpu(im->caps); + unsigned wanted = le32_to_cpu(im->wanted); + unsigned seq = le32_to_cpu(im->seq); + unsigned mseq = le32_to_cpu(im->migrate_seq); + u64 realmino = le64_to_cpu(im->realm); + u64 cap_id = le64_to_cpu(im->cap_id); + u64 p_cap_id; + int peer; + + if (ph) { + p_cap_id = le64_to_cpu(ph->cap_id); + peer = le32_to_cpu(ph->mds); + } else { + p_cap_id = 0; + peer = -1; + } + + dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n", + inode, ci, mds, mseq, peer); + +retry: + spin_lock(&ci->i_ceph_lock); + cap = __get_cap_for_mds(ci, mds); + if (!cap) { + if (!new_cap) { + spin_unlock(&ci->i_ceph_lock); + new_cap = ceph_get_cap(mdsc, NULL); + goto retry; + } + cap = new_cap; + } else { + if (new_cap) { + ceph_put_cap(mdsc, new_cap); + new_cap = NULL; + } + } + + __ceph_caps_issued(ci, &issued); + issued |= __ceph_caps_dirty(ci); + + ceph_add_cap(inode, session, cap_id, -1, caps, wanted, seq, mseq, + realmino, CEPH_CAP_FLAG_AUTH, &new_cap); + + ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL; + if (ocap && ocap->cap_id == p_cap_id) { + dout(" remove export cap %p mds%d flags %d\n", + ocap, peer, ph->flags); + if ((ph->flags & CEPH_CAP_FLAG_AUTH) && + (ocap->seq != le32_to_cpu(ph->seq) || + ocap->mseq != le32_to_cpu(ph->mseq))) { + pr_err("handle_cap_import: mismatched seq/mseq: " + "ino (%llx.%llx) mds%d seq %d mseq %d " + "importer mds%d has peer seq %d mseq %d\n", + ceph_vinop(inode), peer, ocap->seq, + ocap->mseq, mds, le32_to_cpu(ph->seq), + le32_to_cpu(ph->mseq)); + } + __ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE)); + } + + /* make sure we re-request max_size, if necessary */ + ci->i_wanted_max_size = 0; + ci->i_requested_max_size = 0; + + *old_issued = issued; + *target_cap = cap; +} + +/* + * Handle a caps message from the MDS. + * + * Identify the appropriate session, inode, and call the right handler + * based on the cap op. + */ +void ceph_handle_caps(struct ceph_mds_session *session, + struct ceph_msg *msg) +{ + struct ceph_mds_client *mdsc = session->s_mdsc; + struct super_block *sb = mdsc->fsc->sb; + struct inode *inode; + struct ceph_inode_info *ci; + struct ceph_cap *cap; + struct ceph_mds_caps *h; + struct ceph_mds_cap_peer *peer = NULL; + struct ceph_snap_realm *realm; + int mds = session->s_mds; + int op, issued; + u32 seq, mseq; + struct ceph_vino vino; + u64 cap_id; + u64 size, max_size; + u64 tid; + u64 inline_version = 0; + void *inline_data = NULL; + u32 inline_len = 0; + void *snaptrace; + size_t snaptrace_len; + void *p, *end; + + dout("handle_caps from mds%d\n", mds); + + /* decode */ + end = msg->front.iov_base + msg->front.iov_len; + tid = le64_to_cpu(msg->hdr.tid); + if (msg->front.iov_len < sizeof(*h)) + goto bad; + h = msg->front.iov_base; + op = le32_to_cpu(h->op); + vino.ino = le64_to_cpu(h->ino); + vino.snap = CEPH_NOSNAP; + cap_id = le64_to_cpu(h->cap_id); + seq = le32_to_cpu(h->seq); + mseq = le32_to_cpu(h->migrate_seq); + size = le64_to_cpu(h->size); + max_size = le64_to_cpu(h->max_size); + + snaptrace = h + 1; + snaptrace_len = le32_to_cpu(h->snap_trace_len); + p = snaptrace + snaptrace_len; + + if (le16_to_cpu(msg->hdr.version) >= 2) { + u32 flock_len; + ceph_decode_32_safe(&p, end, flock_len, bad); + if (p + flock_len > end) + goto bad; + p += flock_len; + } + + if (le16_to_cpu(msg->hdr.version) >= 3) { + if (op == CEPH_CAP_OP_IMPORT) { + if (p + sizeof(*peer) > end) + goto bad; + peer = p; + p += sizeof(*peer); + } else if (op == CEPH_CAP_OP_EXPORT) { + /* recorded in unused fields */ + peer = (void *)&h->size; + } + } + + if (le16_to_cpu(msg->hdr.version) >= 4) { + ceph_decode_64_safe(&p, end, inline_version, bad); + ceph_decode_32_safe(&p, end, inline_len, bad); + if (p + inline_len > end) + goto bad; + inline_data = p; + p += inline_len; + } + + /* lookup ino */ + inode = ceph_find_inode(sb, vino); + ci = ceph_inode(inode); + dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino, + vino.snap, inode); + + mutex_lock(&session->s_mutex); + session->s_seq++; + dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq, + (unsigned)seq); + + if (op == CEPH_CAP_OP_IMPORT) + ceph_add_cap_releases(mdsc, session); + + if (!inode) { + dout(" i don't have ino %llx\n", vino.ino); + + if (op == CEPH_CAP_OP_IMPORT) { + spin_lock(&session->s_cap_lock); + __queue_cap_release(session, vino.ino, cap_id, + mseq, seq); + spin_unlock(&session->s_cap_lock); + } + goto flush_cap_releases; + } + + /* these will work even if we don't have a cap yet */ + switch (op) { + case CEPH_CAP_OP_FLUSHSNAP_ACK: + handle_cap_flushsnap_ack(inode, tid, h, session); + goto done; + + case CEPH_CAP_OP_EXPORT: + handle_cap_export(inode, h, peer, session); + goto done_unlocked; + + case CEPH_CAP_OP_IMPORT: + realm = NULL; + if (snaptrace_len) { + down_write(&mdsc->snap_rwsem); + ceph_update_snap_trace(mdsc, snaptrace, + snaptrace + snaptrace_len, + false, &realm); + downgrade_write(&mdsc->snap_rwsem); + } else { + down_read(&mdsc->snap_rwsem); + } + handle_cap_import(mdsc, inode, h, peer, session, + &cap, &issued); + handle_cap_grant(mdsc, inode, h, + inline_version, inline_data, inline_len, + msg->middle, session, cap, issued); + if (realm) + ceph_put_snap_realm(mdsc, realm); + goto done_unlocked; + } + + /* the rest require a cap */ + spin_lock(&ci->i_ceph_lock); + cap = __get_cap_for_mds(ceph_inode(inode), mds); + if (!cap) { + dout(" no cap on %p ino %llx.%llx from mds%d\n", + inode, ceph_ino(inode), ceph_snap(inode), mds); + spin_unlock(&ci->i_ceph_lock); + goto flush_cap_releases; + } + + /* note that each of these drops i_ceph_lock for us */ + switch (op) { + case CEPH_CAP_OP_REVOKE: + case CEPH_CAP_OP_GRANT: + __ceph_caps_issued(ci, &issued); + issued |= __ceph_caps_dirty(ci); + handle_cap_grant(mdsc, inode, h, + inline_version, inline_data, inline_len, + msg->middle, session, cap, issued); + goto done_unlocked; + + case CEPH_CAP_OP_FLUSH_ACK: + handle_cap_flush_ack(inode, tid, h, session, cap); + break; + + case CEPH_CAP_OP_TRUNC: + handle_cap_trunc(inode, h, session); + break; + + default: + spin_unlock(&ci->i_ceph_lock); + pr_err("ceph_handle_caps: unknown cap op %d %s\n", op, + ceph_cap_op_name(op)); + } + + goto done; + +flush_cap_releases: + /* + * send any full release message to try to move things + * along for the mds (who clearly thinks we still have this + * cap). + */ + ceph_add_cap_releases(mdsc, session); + ceph_send_cap_releases(mdsc, session); + +done: + mutex_unlock(&session->s_mutex); +done_unlocked: + iput(inode); + return; + +bad: + pr_err("ceph_handle_caps: corrupt message\n"); + ceph_msg_dump(msg); + return; +} + +/* + * Delayed work handler to process end of delayed cap release LRU list. + */ +void ceph_check_delayed_caps(struct ceph_mds_client *mdsc) +{ + struct ceph_inode_info *ci; + int flags = CHECK_CAPS_NODELAY; + + dout("check_delayed_caps\n"); + while (1) { + spin_lock(&mdsc->cap_delay_lock); + if (list_empty(&mdsc->cap_delay_list)) + break; + ci = list_first_entry(&mdsc->cap_delay_list, + struct ceph_inode_info, + i_cap_delay_list); + if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 && + time_before(jiffies, ci->i_hold_caps_max)) + break; + list_del_init(&ci->i_cap_delay_list); + spin_unlock(&mdsc->cap_delay_lock); + dout("check_delayed_caps on %p\n", &ci->vfs_inode); + ceph_check_caps(ci, flags, NULL); + } + spin_unlock(&mdsc->cap_delay_lock); +} + +/* + * Flush all dirty caps to the mds + */ +void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc) +{ + struct ceph_inode_info *ci; + struct inode *inode; + + dout("flush_dirty_caps\n"); + spin_lock(&mdsc->cap_dirty_lock); + while (!list_empty(&mdsc->cap_dirty)) { + ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info, + i_dirty_item); + inode = &ci->vfs_inode; + ihold(inode); + dout("flush_dirty_caps %p\n", inode); + spin_unlock(&mdsc->cap_dirty_lock); + ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL); + iput(inode); + spin_lock(&mdsc->cap_dirty_lock); + } + spin_unlock(&mdsc->cap_dirty_lock); + dout("flush_dirty_caps done\n"); +} + +/* + * Drop open file reference. If we were the last open file, + * we may need to release capabilities to the MDS (or schedule + * their delayed release). + */ +void ceph_put_fmode(struct ceph_inode_info *ci, int fmode) +{ + struct inode *inode = &ci->vfs_inode; + int last = 0; + + spin_lock(&ci->i_ceph_lock); + dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode, + ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1); + BUG_ON(ci->i_nr_by_mode[fmode] == 0); + if (--ci->i_nr_by_mode[fmode] == 0) + last++; + spin_unlock(&ci->i_ceph_lock); + + if (last && ci->i_vino.snap == CEPH_NOSNAP) + ceph_check_caps(ci, 0, NULL); +} + +/* + * Helpers for embedding cap and dentry lease releases into mds + * requests. + * + * @force is used by dentry_release (below) to force inclusion of a + * record for the directory inode, even when there aren't any caps to + * drop. + */ +int ceph_encode_inode_release(void **p, struct inode *inode, + int mds, int drop, int unless, int force) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_cap *cap; + struct ceph_mds_request_release *rel = *p; + int used, dirty; + int ret = 0; + + spin_lock(&ci->i_ceph_lock); + used = __ceph_caps_used(ci); + dirty = __ceph_caps_dirty(ci); + + dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n", + inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop), + ceph_cap_string(unless)); + + /* only drop unused, clean caps */ + drop &= ~(used | dirty); + + cap = __get_cap_for_mds(ci, mds); + if (cap && __cap_is_valid(cap)) { + if (force || + ((cap->issued & drop) && + (cap->issued & unless) == 0)) { + if ((cap->issued & drop) && + (cap->issued & unless) == 0) { + int wanted = __ceph_caps_wanted(ci); + if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0) + wanted |= cap->mds_wanted; + dout("encode_inode_release %p cap %p " + "%s -> %s, wanted %s -> %s\n", inode, cap, + ceph_cap_string(cap->issued), + ceph_cap_string(cap->issued & ~drop), + ceph_cap_string(cap->mds_wanted), + ceph_cap_string(wanted)); + + cap->issued &= ~drop; + cap->implemented &= ~drop; + cap->mds_wanted = wanted; + } else { + dout("encode_inode_release %p cap %p %s" + " (force)\n", inode, cap, + ceph_cap_string(cap->issued)); + } + + rel->ino = cpu_to_le64(ceph_ino(inode)); + rel->cap_id = cpu_to_le64(cap->cap_id); + rel->seq = cpu_to_le32(cap->seq); + rel->issue_seq = cpu_to_le32(cap->issue_seq); + rel->mseq = cpu_to_le32(cap->mseq); + rel->caps = cpu_to_le32(cap->implemented); + rel->wanted = cpu_to_le32(cap->mds_wanted); + rel->dname_len = 0; + rel->dname_seq = 0; + *p += sizeof(*rel); + ret = 1; + } else { + dout("encode_inode_release %p cap %p %s\n", + inode, cap, ceph_cap_string(cap->issued)); + } + } + spin_unlock(&ci->i_ceph_lock); + return ret; +} + +int ceph_encode_dentry_release(void **p, struct dentry *dentry, + int mds, int drop, int unless) +{ + struct inode *dir = d_inode(dentry->d_parent); + struct ceph_mds_request_release *rel = *p; + struct ceph_dentry_info *di = ceph_dentry(dentry); + int force = 0; + int ret; + + /* + * force an record for the directory caps if we have a dentry lease. + * this is racy (can't take i_ceph_lock and d_lock together), but it + * doesn't have to be perfect; the mds will revoke anything we don't + * release. + */ + spin_lock(&dentry->d_lock); + if (di->lease_session && di->lease_session->s_mds == mds) + force = 1; + spin_unlock(&dentry->d_lock); + + ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force); + + spin_lock(&dentry->d_lock); + if (ret && di->lease_session && di->lease_session->s_mds == mds) { + dout("encode_dentry_release %p mds%d seq %d\n", + dentry, mds, (int)di->lease_seq); + rel->dname_len = cpu_to_le32(dentry->d_name.len); + memcpy(*p, dentry->d_name.name, dentry->d_name.len); + *p += dentry->d_name.len; + rel->dname_seq = cpu_to_le32(di->lease_seq); + __ceph_mdsc_drop_dentry_lease(dentry); + } + spin_unlock(&dentry->d_lock); + return ret; +} diff --git a/kernel/fs/ceph/ceph_frag.c b/kernel/fs/ceph/ceph_frag.c new file mode 100644 index 000000000..bdce8b1fb --- /dev/null +++ b/kernel/fs/ceph/ceph_frag.c @@ -0,0 +1,22 @@ +/* + * Ceph 'frag' type + */ +#include +#include + +int ceph_frag_compare(__u32 a, __u32 b) +{ + unsigned va = ceph_frag_value(a); + unsigned vb = ceph_frag_value(b); + if (va < vb) + return -1; + if (va > vb) + return 1; + va = ceph_frag_bits(a); + vb = ceph_frag_bits(b); + if (va < vb) + return -1; + if (va > vb) + return 1; + return 0; +} diff --git a/kernel/fs/ceph/debugfs.c b/kernel/fs/ceph/debugfs.c new file mode 100644 index 000000000..31f831471 --- /dev/null +++ b/kernel/fs/ceph/debugfs.c @@ -0,0 +1,321 @@ +#include + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "super.h" + +#ifdef CONFIG_DEBUG_FS + +#include "mds_client.h" + +static int mdsmap_show(struct seq_file *s, void *p) +{ + int i; + struct ceph_fs_client *fsc = s->private; + + if (fsc->mdsc == NULL || fsc->mdsc->mdsmap == NULL) + return 0; + seq_printf(s, "epoch %d\n", fsc->mdsc->mdsmap->m_epoch); + seq_printf(s, "root %d\n", fsc->mdsc->mdsmap->m_root); + seq_printf(s, "session_timeout %d\n", + fsc->mdsc->mdsmap->m_session_timeout); + seq_printf(s, "session_autoclose %d\n", + fsc->mdsc->mdsmap->m_session_autoclose); + for (i = 0; i < fsc->mdsc->mdsmap->m_max_mds; i++) { + struct ceph_entity_addr *addr = + &fsc->mdsc->mdsmap->m_info[i].addr; + int state = fsc->mdsc->mdsmap->m_info[i].state; + + seq_printf(s, "\tmds%d\t%s\t(%s)\n", i, + ceph_pr_addr(&addr->in_addr), + ceph_mds_state_name(state)); + } + return 0; +} + +/* + * mdsc debugfs + */ +static int mdsc_show(struct seq_file *s, void *p) +{ + struct ceph_fs_client *fsc = s->private; + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + struct rb_node *rp; + int pathlen; + u64 pathbase; + char *path; + + mutex_lock(&mdsc->mutex); + for (rp = rb_first(&mdsc->request_tree); rp; rp = rb_next(rp)) { + req = rb_entry(rp, struct ceph_mds_request, r_node); + + if (req->r_request && req->r_session) + seq_printf(s, "%lld\tmds%d\t", req->r_tid, + req->r_session->s_mds); + else if (!req->r_request) + seq_printf(s, "%lld\t(no request)\t", req->r_tid); + else + seq_printf(s, "%lld\t(no session)\t", req->r_tid); + + seq_printf(s, "%s", ceph_mds_op_name(req->r_op)); + + if (req->r_got_unsafe) + seq_puts(s, "\t(unsafe)"); + else + seq_puts(s, "\t"); + + if (req->r_inode) { + seq_printf(s, " #%llx", ceph_ino(req->r_inode)); + } else if (req->r_dentry) { + path = ceph_mdsc_build_path(req->r_dentry, &pathlen, + &pathbase, 0); + if (IS_ERR(path)) + path = NULL; + spin_lock(&req->r_dentry->d_lock); + seq_printf(s, " #%llx/%pd (%s)", + ceph_ino(d_inode(req->r_dentry->d_parent)), + req->r_dentry, + path ? path : ""); + spin_unlock(&req->r_dentry->d_lock); + kfree(path); + } else if (req->r_path1) { + seq_printf(s, " #%llx/%s", req->r_ino1.ino, + req->r_path1); + } else { + seq_printf(s, " #%llx", req->r_ino1.ino); + } + + if (req->r_old_dentry) { + path = ceph_mdsc_build_path(req->r_old_dentry, &pathlen, + &pathbase, 0); + if (IS_ERR(path)) + path = NULL; + spin_lock(&req->r_old_dentry->d_lock); + seq_printf(s, " #%llx/%pd (%s)", + req->r_old_dentry_dir ? + ceph_ino(req->r_old_dentry_dir) : 0, + req->r_old_dentry, + path ? path : ""); + spin_unlock(&req->r_old_dentry->d_lock); + kfree(path); + } else if (req->r_path2) { + if (req->r_ino2.ino) + seq_printf(s, " #%llx/%s", req->r_ino2.ino, + req->r_path2); + else + seq_printf(s, " %s", req->r_path2); + } + + seq_puts(s, "\n"); + } + mutex_unlock(&mdsc->mutex); + + return 0; +} + +static int caps_show(struct seq_file *s, void *p) +{ + struct ceph_fs_client *fsc = s->private; + int total, avail, used, reserved, min; + + ceph_reservation_status(fsc, &total, &avail, &used, &reserved, &min); + seq_printf(s, "total\t\t%d\n" + "avail\t\t%d\n" + "used\t\t%d\n" + "reserved\t%d\n" + "min\t%d\n", + total, avail, used, reserved, min); + return 0; +} + +static int dentry_lru_show(struct seq_file *s, void *ptr) +{ + struct ceph_fs_client *fsc = s->private; + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_dentry_info *di; + + spin_lock(&mdsc->dentry_lru_lock); + list_for_each_entry(di, &mdsc->dentry_lru, lru) { + struct dentry *dentry = di->dentry; + seq_printf(s, "%p %p\t%pd\n", + di, dentry, dentry); + } + spin_unlock(&mdsc->dentry_lru_lock); + + return 0; +} + +static int mds_sessions_show(struct seq_file *s, void *ptr) +{ + struct ceph_fs_client *fsc = s->private; + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_auth_client *ac = fsc->client->monc.auth; + struct ceph_options *opt = fsc->client->options; + int mds = -1; + + mutex_lock(&mdsc->mutex); + + /* The 'num' portion of an 'entity name' */ + seq_printf(s, "global_id %llu\n", ac->global_id); + + /* The -o name mount argument */ + seq_printf(s, "name \"%s\"\n", opt->name ? opt->name : ""); + + /* The list of MDS session rank+state */ + for (mds = 0; mds < mdsc->max_sessions; mds++) { + struct ceph_mds_session *session = + __ceph_lookup_mds_session(mdsc, mds); + if (!session) { + continue; + } + mutex_unlock(&mdsc->mutex); + seq_printf(s, "mds.%d %s\n", + session->s_mds, + ceph_session_state_name(session->s_state)); + + ceph_put_mds_session(session); + mutex_lock(&mdsc->mutex); + } + mutex_unlock(&mdsc->mutex); + + return 0; +} + +CEPH_DEFINE_SHOW_FUNC(mdsmap_show) +CEPH_DEFINE_SHOW_FUNC(mdsc_show) +CEPH_DEFINE_SHOW_FUNC(caps_show) +CEPH_DEFINE_SHOW_FUNC(dentry_lru_show) +CEPH_DEFINE_SHOW_FUNC(mds_sessions_show) + + +/* + * debugfs + */ +static int congestion_kb_set(void *data, u64 val) +{ + struct ceph_fs_client *fsc = (struct ceph_fs_client *)data; + + fsc->mount_options->congestion_kb = (int)val; + return 0; +} + +static int congestion_kb_get(void *data, u64 *val) +{ + struct ceph_fs_client *fsc = (struct ceph_fs_client *)data; + + *val = (u64)fsc->mount_options->congestion_kb; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(congestion_kb_fops, congestion_kb_get, + congestion_kb_set, "%llu\n"); + + +void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc) +{ + dout("ceph_fs_debugfs_cleanup\n"); + debugfs_remove(fsc->debugfs_bdi); + debugfs_remove(fsc->debugfs_congestion_kb); + debugfs_remove(fsc->debugfs_mdsmap); + debugfs_remove(fsc->debugfs_mds_sessions); + debugfs_remove(fsc->debugfs_caps); + debugfs_remove(fsc->debugfs_mdsc); + debugfs_remove(fsc->debugfs_dentry_lru); +} + +int ceph_fs_debugfs_init(struct ceph_fs_client *fsc) +{ + char name[100]; + int err = -ENOMEM; + + dout("ceph_fs_debugfs_init\n"); + BUG_ON(!fsc->client->debugfs_dir); + fsc->debugfs_congestion_kb = + debugfs_create_file("writeback_congestion_kb", + 0600, + fsc->client->debugfs_dir, + fsc, + &congestion_kb_fops); + if (!fsc->debugfs_congestion_kb) + goto out; + + snprintf(name, sizeof(name), "../../bdi/%s", + dev_name(fsc->backing_dev_info.dev)); + fsc->debugfs_bdi = + debugfs_create_symlink("bdi", + fsc->client->debugfs_dir, + name); + if (!fsc->debugfs_bdi) + goto out; + + fsc->debugfs_mdsmap = debugfs_create_file("mdsmap", + 0600, + fsc->client->debugfs_dir, + fsc, + &mdsmap_show_fops); + if (!fsc->debugfs_mdsmap) + goto out; + + fsc->debugfs_mds_sessions = debugfs_create_file("mds_sessions", + 0600, + fsc->client->debugfs_dir, + fsc, + &mds_sessions_show_fops); + if (!fsc->debugfs_mds_sessions) + goto out; + + fsc->debugfs_mdsc = debugfs_create_file("mdsc", + 0600, + fsc->client->debugfs_dir, + fsc, + &mdsc_show_fops); + if (!fsc->debugfs_mdsc) + goto out; + + fsc->debugfs_caps = debugfs_create_file("caps", + 0400, + fsc->client->debugfs_dir, + fsc, + &caps_show_fops); + if (!fsc->debugfs_caps) + goto out; + + fsc->debugfs_dentry_lru = debugfs_create_file("dentry_lru", + 0600, + fsc->client->debugfs_dir, + fsc, + &dentry_lru_show_fops); + if (!fsc->debugfs_dentry_lru) + goto out; + + return 0; + +out: + ceph_fs_debugfs_cleanup(fsc); + return err; +} + + +#else /* CONFIG_DEBUG_FS */ + +int ceph_fs_debugfs_init(struct ceph_fs_client *fsc) +{ + return 0; +} + +void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc) +{ +} + +#endif /* CONFIG_DEBUG_FS */ diff --git a/kernel/fs/ceph/dir.c b/kernel/fs/ceph/dir.c new file mode 100644 index 000000000..4248307fe --- /dev/null +++ b/kernel/fs/ceph/dir.c @@ -0,0 +1,1411 @@ +#include + +#include +#include +#include +#include +#include + +#include "super.h" +#include "mds_client.h" + +/* + * Directory operations: readdir, lookup, create, link, unlink, + * rename, etc. + */ + +/* + * Ceph MDS operations are specified in terms of a base ino and + * relative path. Thus, the client can specify an operation on a + * specific inode (e.g., a getattr due to fstat(2)), or as a path + * relative to, say, the root directory. + * + * Normally, we limit ourselves to strict inode ops (no path component) + * or dentry operations (a single path component relative to an ino). The + * exception to this is open_root_dentry(), which will open the mount + * point by name. + */ + +const struct dentry_operations ceph_dentry_ops; + +/* + * Initialize ceph dentry state. + */ +int ceph_init_dentry(struct dentry *dentry) +{ + struct ceph_dentry_info *di; + + if (dentry->d_fsdata) + return 0; + + di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO); + if (!di) + return -ENOMEM; /* oh well */ + + spin_lock(&dentry->d_lock); + if (dentry->d_fsdata) { + /* lost a race */ + kmem_cache_free(ceph_dentry_cachep, di); + goto out_unlock; + } + + if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) + d_set_d_op(dentry, &ceph_dentry_ops); + else if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_SNAPDIR) + d_set_d_op(dentry, &ceph_snapdir_dentry_ops); + else + d_set_d_op(dentry, &ceph_snap_dentry_ops); + + di->dentry = dentry; + di->lease_session = NULL; + dentry->d_time = jiffies; + /* avoid reordering d_fsdata setup so that the check above is safe */ + smp_mb(); + dentry->d_fsdata = di; + ceph_dentry_lru_add(dentry); +out_unlock: + spin_unlock(&dentry->d_lock); + return 0; +} + +struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry) +{ + struct inode *inode = NULL; + + if (!dentry) + return NULL; + + spin_lock(&dentry->d_lock); + if (!IS_ROOT(dentry)) { + inode = d_inode(dentry->d_parent); + ihold(inode); + } + spin_unlock(&dentry->d_lock); + return inode; +} + + +/* + * for readdir, we encode the directory frag and offset within that + * frag into f_pos. + */ +static unsigned fpos_frag(loff_t p) +{ + return p >> 32; +} +static unsigned fpos_off(loff_t p) +{ + return p & 0xffffffff; +} + +static int fpos_cmp(loff_t l, loff_t r) +{ + int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); + if (v) + return v; + return (int)(fpos_off(l) - fpos_off(r)); +} + +/* + * When possible, we try to satisfy a readdir by peeking at the + * dcache. We make this work by carefully ordering dentries on + * d_child when we initially get results back from the MDS, and + * falling back to a "normal" sync readdir if any dentries in the dir + * are dropped. + * + * Complete dir indicates that we have all dentries in the dir. It is + * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by + * the MDS if/when the directory is modified). + */ +static int __dcache_readdir(struct file *file, struct dir_context *ctx, + u32 shared_gen) +{ + struct ceph_file_info *fi = file->private_data; + struct dentry *parent = file->f_path.dentry; + struct inode *dir = d_inode(parent); + struct list_head *p; + struct dentry *dentry, *last; + struct ceph_dentry_info *di; + int err = 0; + + /* claim ref on last dentry we returned */ + last = fi->dentry; + fi->dentry = NULL; + + dout("__dcache_readdir %p v%u at %llu (last %p)\n", + dir, shared_gen, ctx->pos, last); + + spin_lock(&parent->d_lock); + + /* start at beginning? */ + if (ctx->pos == 2 || last == NULL || + fpos_cmp(ctx->pos, ceph_dentry(last)->offset) < 0) { + if (list_empty(&parent->d_subdirs)) + goto out_unlock; + p = parent->d_subdirs.prev; + dout(" initial p %p/%p\n", p->prev, p->next); + } else { + p = last->d_child.prev; + } + +more: + dentry = list_entry(p, struct dentry, d_child); + di = ceph_dentry(dentry); + while (1) { + dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, + d_unhashed(dentry) ? "!hashed" : "hashed", + parent->d_subdirs.prev, parent->d_subdirs.next); + if (p == &parent->d_subdirs) { + fi->flags |= CEPH_F_ATEND; + goto out_unlock; + } + spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); + if (di->lease_shared_gen == shared_gen && + !d_unhashed(dentry) && d_really_is_positive(dentry) && + ceph_snap(d_inode(dentry)) != CEPH_SNAPDIR && + ceph_ino(d_inode(dentry)) != CEPH_INO_CEPH && + fpos_cmp(ctx->pos, di->offset) <= 0) + break; + dout(" skipping %p %pd at %llu (%llu)%s%s\n", dentry, + dentry, di->offset, + ctx->pos, d_unhashed(dentry) ? " unhashed" : "", + !d_inode(dentry) ? " null" : ""); + spin_unlock(&dentry->d_lock); + p = p->prev; + dentry = list_entry(p, struct dentry, d_child); + di = ceph_dentry(dentry); + } + + dget_dlock(dentry); + spin_unlock(&dentry->d_lock); + spin_unlock(&parent->d_lock); + + /* make sure a dentry wasn't dropped while we didn't have parent lock */ + if (!ceph_dir_is_complete_ordered(dir)) { + dout(" lost dir complete on %p; falling back to mds\n", dir); + dput(dentry); + err = -EAGAIN; + goto out; + } + + dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos, + dentry, dentry, d_inode(dentry)); + if (!dir_emit(ctx, dentry->d_name.name, + dentry->d_name.len, + ceph_translate_ino(dentry->d_sb, d_inode(dentry)->i_ino), + d_inode(dentry)->i_mode >> 12)) { + if (last) { + /* remember our position */ + fi->dentry = last; + fi->next_offset = fpos_off(di->offset); + } + dput(dentry); + return 0; + } + + ctx->pos = di->offset + 1; + + if (last) + dput(last); + last = dentry; + + spin_lock(&parent->d_lock); + p = p->prev; /* advance to next dentry */ + goto more; + +out_unlock: + spin_unlock(&parent->d_lock); +out: + if (last) + dput(last); + return err; +} + +/* + * make note of the last dentry we read, so we can + * continue at the same lexicographical point, + * regardless of what dir changes take place on the + * server. + */ +static int note_last_dentry(struct ceph_file_info *fi, const char *name, + int len) +{ + kfree(fi->last_name); + fi->last_name = kmalloc(len+1, GFP_NOFS); + if (!fi->last_name) + return -ENOMEM; + memcpy(fi->last_name, name, len); + fi->last_name[len] = 0; + dout("note_last_dentry '%s'\n", fi->last_name); + return 0; +} + +static int ceph_readdir(struct file *file, struct dir_context *ctx) +{ + struct ceph_file_info *fi = file->private_data; + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_mds_client *mdsc = fsc->mdsc; + unsigned frag = fpos_frag(ctx->pos); + int off = fpos_off(ctx->pos); + int err; + u32 ftype; + struct ceph_mds_reply_info_parsed *rinfo; + + dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off); + if (fi->flags & CEPH_F_ATEND) + return 0; + + /* always start with . and .. */ + if (ctx->pos == 0) { + dout("readdir off 0 -> '.'\n"); + if (!dir_emit(ctx, ".", 1, + ceph_translate_ino(inode->i_sb, inode->i_ino), + inode->i_mode >> 12)) + return 0; + ctx->pos = 1; + off = 1; + } + if (ctx->pos == 1) { + ino_t ino = parent_ino(file->f_path.dentry); + dout("readdir off 1 -> '..'\n"); + if (!dir_emit(ctx, "..", 2, + ceph_translate_ino(inode->i_sb, ino), + inode->i_mode >> 12)) + return 0; + ctx->pos = 2; + off = 2; + } + + /* can we use the dcache? */ + spin_lock(&ci->i_ceph_lock); + if ((ctx->pos == 2 || fi->dentry) && + ceph_test_mount_opt(fsc, DCACHE) && + !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && + ceph_snap(inode) != CEPH_SNAPDIR && + __ceph_dir_is_complete_ordered(ci) && + __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { + u32 shared_gen = ci->i_shared_gen; + spin_unlock(&ci->i_ceph_lock); + err = __dcache_readdir(file, ctx, shared_gen); + if (err != -EAGAIN) + return err; + frag = fpos_frag(ctx->pos); + off = fpos_off(ctx->pos); + } else { + spin_unlock(&ci->i_ceph_lock); + } + if (fi->dentry) { + err = note_last_dentry(fi, fi->dentry->d_name.name, + fi->dentry->d_name.len); + if (err) + return err; + dput(fi->dentry); + fi->dentry = NULL; + } + + /* proceed with a normal readdir */ + + if (ctx->pos == 2) { + /* note dir version at start of readdir so we can tell + * if any dentries get dropped */ + fi->dir_release_count = atomic_read(&ci->i_release_count); + fi->dir_ordered_count = ci->i_ordered_count; + } + +more: + /* do we have the correct frag content buffered? */ + if (fi->frag != frag || fi->last_readdir == NULL) { + struct ceph_mds_request *req; + int op = ceph_snap(inode) == CEPH_SNAPDIR ? + CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; + + /* discard old result, if any */ + if (fi->last_readdir) { + ceph_mdsc_put_request(fi->last_readdir); + fi->last_readdir = NULL; + } + + dout("readdir fetching %llx.%llx frag %x offset '%s'\n", + ceph_vinop(inode), frag, fi->last_name); + req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); + if (IS_ERR(req)) + return PTR_ERR(req); + err = ceph_alloc_readdir_reply_buffer(req, inode); + if (err) { + ceph_mdsc_put_request(req); + return err; + } + /* hints to request -> mds selection code */ + req->r_direct_mode = USE_AUTH_MDS; + req->r_direct_hash = ceph_frag_value(frag); + req->r_direct_is_hash = true; + if (fi->last_name) { + req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); + if (!req->r_path2) { + ceph_mdsc_put_request(req); + return -ENOMEM; + } + } + req->r_readdir_offset = fi->next_offset; + req->r_args.readdir.frag = cpu_to_le32(frag); + + req->r_inode = inode; + ihold(inode); + req->r_dentry = dget(file->f_path.dentry); + err = ceph_mdsc_do_request(mdsc, NULL, req); + if (err < 0) { + ceph_mdsc_put_request(req); + return err; + } + dout("readdir got and parsed readdir result=%d" + " on frag %x, end=%d, complete=%d\n", err, frag, + (int)req->r_reply_info.dir_end, + (int)req->r_reply_info.dir_complete); + + if (!req->r_did_prepopulate) { + dout("readdir !did_prepopulate"); + /* preclude from marking dir complete */ + fi->dir_release_count--; + } + + /* note next offset and last dentry name */ + rinfo = &req->r_reply_info; + if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { + frag = le32_to_cpu(rinfo->dir_dir->frag); + if (ceph_frag_is_leftmost(frag)) + fi->next_offset = 2; + else + fi->next_offset = 0; + off = fi->next_offset; + } + fi->frag = frag; + fi->offset = fi->next_offset; + fi->last_readdir = req; + + if (req->r_reply_info.dir_end) { + kfree(fi->last_name); + fi->last_name = NULL; + if (ceph_frag_is_rightmost(frag)) + fi->next_offset = 2; + else + fi->next_offset = 0; + } else { + err = note_last_dentry(fi, + rinfo->dir_dname[rinfo->dir_nr-1], + rinfo->dir_dname_len[rinfo->dir_nr-1]); + if (err) + return err; + fi->next_offset += rinfo->dir_nr; + } + } + + rinfo = &fi->last_readdir->r_reply_info; + dout("readdir frag %x num %d off %d chunkoff %d\n", frag, + rinfo->dir_nr, off, fi->offset); + + ctx->pos = ceph_make_fpos(frag, off); + while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { + struct ceph_mds_reply_inode *in = + rinfo->dir_in[off - fi->offset].in; + struct ceph_vino vino; + ino_t ino; + + dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", + off, off - fi->offset, rinfo->dir_nr, ctx->pos, + rinfo->dir_dname_len[off - fi->offset], + rinfo->dir_dname[off - fi->offset], in); + BUG_ON(!in); + ftype = le32_to_cpu(in->mode) >> 12; + vino.ino = le64_to_cpu(in->ino); + vino.snap = le64_to_cpu(in->snapid); + ino = ceph_vino_to_ino(vino); + if (!dir_emit(ctx, + rinfo->dir_dname[off - fi->offset], + rinfo->dir_dname_len[off - fi->offset], + ceph_translate_ino(inode->i_sb, ino), ftype)) { + dout("filldir stopping us...\n"); + return 0; + } + off++; + ctx->pos++; + } + + if (fi->last_name) { + ceph_mdsc_put_request(fi->last_readdir); + fi->last_readdir = NULL; + goto more; + } + + /* more frags? */ + if (!ceph_frag_is_rightmost(frag)) { + frag = ceph_frag_next(frag); + off = 0; + ctx->pos = ceph_make_fpos(frag, off); + dout("readdir next frag is %x\n", frag); + goto more; + } + fi->flags |= CEPH_F_ATEND; + + /* + * if dir_release_count still matches the dir, no dentries + * were released during the whole readdir, and we should have + * the complete dir contents in our cache. + */ + spin_lock(&ci->i_ceph_lock); + if (atomic_read(&ci->i_release_count) == fi->dir_release_count) { + if (ci->i_ordered_count == fi->dir_ordered_count) + dout(" marking %p complete and ordered\n", inode); + else + dout(" marking %p complete\n", inode); + __ceph_dir_set_complete(ci, fi->dir_release_count, + fi->dir_ordered_count); + } + spin_unlock(&ci->i_ceph_lock); + + dout("readdir %p file %p done.\n", inode, file); + return 0; +} + +static void reset_readdir(struct ceph_file_info *fi, unsigned frag) +{ + if (fi->last_readdir) { + ceph_mdsc_put_request(fi->last_readdir); + fi->last_readdir = NULL; + } + kfree(fi->last_name); + fi->last_name = NULL; + if (ceph_frag_is_leftmost(frag)) + fi->next_offset = 2; /* compensate for . and .. */ + else + fi->next_offset = 0; + if (fi->dentry) { + dput(fi->dentry); + fi->dentry = NULL; + } + fi->flags &= ~CEPH_F_ATEND; +} + +static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) +{ + struct ceph_file_info *fi = file->private_data; + struct inode *inode = file->f_mapping->host; + loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset); + loff_t retval; + + mutex_lock(&inode->i_mutex); + retval = -EINVAL; + switch (whence) { + case SEEK_END: + offset += inode->i_size + 2; /* FIXME */ + break; + case SEEK_CUR: + offset += file->f_pos; + case SEEK_SET: + break; + default: + goto out; + } + + if (offset >= 0) { + if (offset != file->f_pos) { + file->f_pos = offset; + file->f_version = 0; + fi->flags &= ~CEPH_F_ATEND; + } + retval = offset; + + /* + * discard buffered readdir content on seekdir(0), or + * seek to new frag, or seek prior to current chunk. + */ + if (offset == 0 || + fpos_frag(offset) != fi->frag || + fpos_off(offset) < fi->offset) { + dout("dir_llseek dropping %p content\n", file); + reset_readdir(fi, fpos_frag(offset)); + } + + /* bump dir_release_count if we did a forward seek */ + if (fpos_cmp(offset, old_offset) > 0) + fi->dir_release_count--; + } +out: + mutex_unlock(&inode->i_mutex); + return retval; +} + +/* + * Handle lookups for the hidden .snap directory. + */ +int ceph_handle_snapdir(struct ceph_mds_request *req, + struct dentry *dentry, int err) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); + struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */ + + /* .snap dir? */ + if (err == -ENOENT && + ceph_snap(parent) == CEPH_NOSNAP && + strcmp(dentry->d_name.name, + fsc->mount_options->snapdir_name) == 0) { + struct inode *inode = ceph_get_snapdir(parent); + dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n", + dentry, dentry, inode); + BUG_ON(!d_unhashed(dentry)); + d_add(dentry, inode); + err = 0; + } + return err; +} + +/* + * Figure out final result of a lookup/open request. + * + * Mainly, make sure we return the final req->r_dentry (if it already + * existed) in place of the original VFS-provided dentry when they + * differ. + * + * Gracefully handle the case where the MDS replies with -ENOENT and + * no trace (which it may do, at its discretion, e.g., if it doesn't + * care to issue a lease on the negative dentry). + */ +struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, + struct dentry *dentry, int err) +{ + if (err == -ENOENT) { + /* no trace? */ + err = 0; + if (!req->r_reply_info.head->is_dentry) { + dout("ENOENT and no trace, dentry %p inode %p\n", + dentry, d_inode(dentry)); + if (d_really_is_positive(dentry)) { + d_drop(dentry); + err = -ENOENT; + } else { + d_add(dentry, NULL); + } + } + } + if (err) + dentry = ERR_PTR(err); + else if (dentry != req->r_dentry) + dentry = dget(req->r_dentry); /* we got spliced */ + else + dentry = NULL; + return dentry; +} + +static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) +{ + return ceph_ino(inode) == CEPH_INO_ROOT && + strncmp(dentry->d_name.name, ".ceph", 5) == 0; +} + +/* + * Look up a single dir entry. If there is a lookup intent, inform + * the MDS so that it gets our 'caps wanted' value in a single op. + */ +static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, + unsigned int flags) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + int op; + int err; + + dout("lookup %p dentry %p '%pd'\n", + dir, dentry, dentry); + + if (dentry->d_name.len > NAME_MAX) + return ERR_PTR(-ENAMETOOLONG); + + err = ceph_init_dentry(dentry); + if (err < 0) + return ERR_PTR(err); + + /* can we conclude ENOENT locally? */ + if (d_really_is_negative(dentry)) { + struct ceph_inode_info *ci = ceph_inode(dir); + struct ceph_dentry_info *di = ceph_dentry(dentry); + + spin_lock(&ci->i_ceph_lock); + dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); + if (strncmp(dentry->d_name.name, + fsc->mount_options->snapdir_name, + dentry->d_name.len) && + !is_root_ceph_dentry(dir, dentry) && + ceph_test_mount_opt(fsc, DCACHE) && + __ceph_dir_is_complete(ci) && + (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { + spin_unlock(&ci->i_ceph_lock); + dout(" dir %p complete, -ENOENT\n", dir); + d_add(dentry, NULL); + di->lease_shared_gen = ci->i_shared_gen; + return NULL; + } + spin_unlock(&ci->i_ceph_lock); + } + + op = ceph_snap(dir) == CEPH_SNAPDIR ? + CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; + req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); + if (IS_ERR(req)) + return ERR_CAST(req); + req->r_dentry = dget(dentry); + req->r_num_caps = 2; + /* we only need inode linkage */ + req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); + req->r_locked_dir = dir; + err = ceph_mdsc_do_request(mdsc, NULL, req); + err = ceph_handle_snapdir(req, dentry, err); + dentry = ceph_finish_lookup(req, dentry, err); + ceph_mdsc_put_request(req); /* will dput(dentry) */ + dout("lookup result=%p\n", dentry); + return dentry; +} + +/* + * If we do a create but get no trace back from the MDS, follow up with + * a lookup (the VFS expects us to link up the provided dentry). + */ +int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) +{ + struct dentry *result = ceph_lookup(dir, dentry, 0); + + if (result && !IS_ERR(result)) { + /* + * We created the item, then did a lookup, and found + * it was already linked to another inode we already + * had in our cache (and thus got spliced). To not + * confuse VFS (especially when inode is a directory), + * we don't link our dentry to that inode, return an + * error instead. + * + * This event should be rare and it happens only when + * we talk to old MDS. Recent MDS does not send traceless + * reply for request that creates new inode. + */ + d_drop(result); + return -ESTALE; + } + return PTR_ERR(result); +} + +static int ceph_mknod(struct inode *dir, struct dentry *dentry, + umode_t mode, dev_t rdev) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + struct ceph_acls_info acls = {}; + int err; + + if (ceph_snap(dir) != CEPH_NOSNAP) + return -EROFS; + + err = ceph_pre_init_acls(dir, &mode, &acls); + if (err < 0) + return err; + + dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", + dir, dentry, mode, rdev); + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + req->r_dentry = dget(dentry); + req->r_num_caps = 2; + req->r_locked_dir = dir; + req->r_args.mknod.mode = cpu_to_le32(mode); + req->r_args.mknod.rdev = cpu_to_le32(rdev); + req->r_dentry_drop = CEPH_CAP_FILE_SHARED; + req->r_dentry_unless = CEPH_CAP_FILE_EXCL; + if (acls.pagelist) { + req->r_pagelist = acls.pagelist; + acls.pagelist = NULL; + } + err = ceph_mdsc_do_request(mdsc, dir, req); + if (!err && !req->r_reply_info.head->is_dentry) + err = ceph_handle_notrace_create(dir, dentry); + ceph_mdsc_put_request(req); +out: + if (!err) + ceph_init_inode_acls(d_inode(dentry), &acls); + else + d_drop(dentry); + ceph_release_acls_info(&acls); + return err; +} + +static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, + bool excl) +{ + return ceph_mknod(dir, dentry, mode, 0); +} + +static int ceph_symlink(struct inode *dir, struct dentry *dentry, + const char *dest) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + int err; + + if (ceph_snap(dir) != CEPH_NOSNAP) + return -EROFS; + + dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + req->r_path2 = kstrdup(dest, GFP_NOFS); + if (!req->r_path2) { + err = -ENOMEM; + ceph_mdsc_put_request(req); + goto out; + } + req->r_locked_dir = dir; + req->r_dentry = dget(dentry); + req->r_num_caps = 2; + req->r_dentry_drop = CEPH_CAP_FILE_SHARED; + req->r_dentry_unless = CEPH_CAP_FILE_EXCL; + err = ceph_mdsc_do_request(mdsc, dir, req); + if (!err && !req->r_reply_info.head->is_dentry) + err = ceph_handle_notrace_create(dir, dentry); + ceph_mdsc_put_request(req); +out: + if (err) + d_drop(dentry); + return err; +} + +static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + struct ceph_acls_info acls = {}; + int err = -EROFS; + int op; + + if (ceph_snap(dir) == CEPH_SNAPDIR) { + /* mkdir .snap/foo is a MKSNAP */ + op = CEPH_MDS_OP_MKSNAP; + dout("mksnap dir %p snap '%pd' dn %p\n", dir, + dentry, dentry); + } else if (ceph_snap(dir) == CEPH_NOSNAP) { + dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); + op = CEPH_MDS_OP_MKDIR; + } else { + goto out; + } + + mode |= S_IFDIR; + err = ceph_pre_init_acls(dir, &mode, &acls); + if (err < 0) + goto out; + + req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + + req->r_dentry = dget(dentry); + req->r_num_caps = 2; + req->r_locked_dir = dir; + req->r_args.mkdir.mode = cpu_to_le32(mode); + req->r_dentry_drop = CEPH_CAP_FILE_SHARED; + req->r_dentry_unless = CEPH_CAP_FILE_EXCL; + if (acls.pagelist) { + req->r_pagelist = acls.pagelist; + acls.pagelist = NULL; + } + err = ceph_mdsc_do_request(mdsc, dir, req); + if (!err && + !req->r_reply_info.head->is_target && + !req->r_reply_info.head->is_dentry) + err = ceph_handle_notrace_create(dir, dentry); + ceph_mdsc_put_request(req); +out: + if (!err) + ceph_init_inode_acls(d_inode(dentry), &acls); + else + d_drop(dentry); + ceph_release_acls_info(&acls); + return err; +} + +static int ceph_link(struct dentry *old_dentry, struct inode *dir, + struct dentry *dentry) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + int err; + + if (ceph_snap(dir) != CEPH_NOSNAP) + return -EROFS; + + dout("link in dir %p old_dentry %p dentry %p\n", dir, + old_dentry, dentry); + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); + if (IS_ERR(req)) { + d_drop(dentry); + return PTR_ERR(req); + } + req->r_dentry = dget(dentry); + req->r_num_caps = 2; + req->r_old_dentry = dget(old_dentry); + req->r_locked_dir = dir; + req->r_dentry_drop = CEPH_CAP_FILE_SHARED; + req->r_dentry_unless = CEPH_CAP_FILE_EXCL; + /* release LINK_SHARED on source inode (mds will lock it) */ + req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; + err = ceph_mdsc_do_request(mdsc, dir, req); + if (err) { + d_drop(dentry); + } else if (!req->r_reply_info.head->is_dentry) { + ihold(d_inode(old_dentry)); + d_instantiate(dentry, d_inode(old_dentry)); + } + ceph_mdsc_put_request(req); + return err; +} + +/* + * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it + * looks like the link count will hit 0, drop any other caps (other + * than PIN) we don't specifically want (due to the file still being + * open). + */ +static int drop_caps_for_unlink(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; + + spin_lock(&ci->i_ceph_lock); + if (inode->i_nlink == 1) { + drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); + ci->i_ceph_flags |= CEPH_I_NODELAY; + } + spin_unlock(&ci->i_ceph_lock); + return drop; +} + +/* + * rmdir and unlink are differ only by the metadata op code + */ +static int ceph_unlink(struct inode *dir, struct dentry *dentry) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct inode *inode = d_inode(dentry); + struct ceph_mds_request *req; + int err = -EROFS; + int op; + + if (ceph_snap(dir) == CEPH_SNAPDIR) { + /* rmdir .snap/foo is RMSNAP */ + dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); + op = CEPH_MDS_OP_RMSNAP; + } else if (ceph_snap(dir) == CEPH_NOSNAP) { + dout("unlink/rmdir dir %p dn %p inode %p\n", + dir, dentry, inode); + op = d_is_dir(dentry) ? + CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; + } else + goto out; + req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + req->r_dentry = dget(dentry); + req->r_num_caps = 2; + req->r_locked_dir = dir; + req->r_dentry_drop = CEPH_CAP_FILE_SHARED; + req->r_dentry_unless = CEPH_CAP_FILE_EXCL; + req->r_inode_drop = drop_caps_for_unlink(inode); + err = ceph_mdsc_do_request(mdsc, dir, req); + if (!err && !req->r_reply_info.head->is_dentry) + d_delete(dentry); + ceph_mdsc_put_request(req); +out: + return err; +} + +static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + int op = CEPH_MDS_OP_RENAME; + int err; + + if (ceph_snap(old_dir) != ceph_snap(new_dir)) + return -EXDEV; + if (ceph_snap(old_dir) != CEPH_NOSNAP) { + if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) + op = CEPH_MDS_OP_RENAMESNAP; + else + return -EROFS; + } + dout("rename dir %p dentry %p to dir %p dentry %p\n", + old_dir, old_dentry, new_dir, new_dentry); + req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); + if (IS_ERR(req)) + return PTR_ERR(req); + ihold(old_dir); + req->r_dentry = dget(new_dentry); + req->r_num_caps = 2; + req->r_old_dentry = dget(old_dentry); + req->r_old_dentry_dir = old_dir; + req->r_locked_dir = new_dir; + req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; + req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; + req->r_dentry_drop = CEPH_CAP_FILE_SHARED; + req->r_dentry_unless = CEPH_CAP_FILE_EXCL; + /* release LINK_RDCACHE on source inode (mds will lock it) */ + req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; + if (d_really_is_positive(new_dentry)) + req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry)); + err = ceph_mdsc_do_request(mdsc, old_dir, req); + if (!err && !req->r_reply_info.head->is_dentry) { + /* + * Normally d_move() is done by fill_trace (called by + * do_request, above). If there is no trace, we need + * to do it here. + */ + + d_move(old_dentry, new_dentry); + + /* ensure target dentry is invalidated, despite + rehashing bug in vfs_rename_dir */ + ceph_invalidate_dentry_lease(new_dentry); + + /* d_move screws up sibling dentries' offsets */ + ceph_dir_clear_complete(old_dir); + ceph_dir_clear_complete(new_dir); + + } + ceph_mdsc_put_request(req); + return err; +} + +/* + * Ensure a dentry lease will no longer revalidate. + */ +void ceph_invalidate_dentry_lease(struct dentry *dentry) +{ + spin_lock(&dentry->d_lock); + dentry->d_time = jiffies; + ceph_dentry(dentry)->lease_shared_gen = 0; + spin_unlock(&dentry->d_lock); +} + +/* + * Check if dentry lease is valid. If not, delete the lease. Try to + * renew if the least is more than half up. + */ +static int dentry_lease_is_valid(struct dentry *dentry) +{ + struct ceph_dentry_info *di; + struct ceph_mds_session *s; + int valid = 0; + u32 gen; + unsigned long ttl; + struct ceph_mds_session *session = NULL; + struct inode *dir = NULL; + u32 seq = 0; + + spin_lock(&dentry->d_lock); + di = ceph_dentry(dentry); + if (di->lease_session) { + s = di->lease_session; + spin_lock(&s->s_gen_ttl_lock); + gen = s->s_cap_gen; + ttl = s->s_cap_ttl; + spin_unlock(&s->s_gen_ttl_lock); + + if (di->lease_gen == gen && + time_before(jiffies, dentry->d_time) && + time_before(jiffies, ttl)) { + valid = 1; + if (di->lease_renew_after && + time_after(jiffies, di->lease_renew_after)) { + /* we should renew */ + dir = d_inode(dentry->d_parent); + session = ceph_get_mds_session(s); + seq = di->lease_seq; + di->lease_renew_after = 0; + di->lease_renew_from = jiffies; + } + } + } + spin_unlock(&dentry->d_lock); + + if (session) { + ceph_mdsc_lease_send_msg(session, dir, dentry, + CEPH_MDS_LEASE_RENEW, seq); + ceph_put_mds_session(session); + } + dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); + return valid; +} + +/* + * Check if directory-wide content lease/cap is valid. + */ +static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) +{ + struct ceph_inode_info *ci = ceph_inode(dir); + struct ceph_dentry_info *di = ceph_dentry(dentry); + int valid = 0; + + spin_lock(&ci->i_ceph_lock); + if (ci->i_shared_gen == di->lease_shared_gen) + valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); + spin_unlock(&ci->i_ceph_lock); + dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", + dir, (unsigned)ci->i_shared_gen, dentry, + (unsigned)di->lease_shared_gen, valid); + return valid; +} + +/* + * Check if cached dentry can be trusted. + */ +static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) +{ + int valid = 0; + struct inode *dir; + + if (flags & LOOKUP_RCU) + return -ECHILD; + + dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry, + dentry, d_inode(dentry), ceph_dentry(dentry)->offset); + + dir = ceph_get_dentry_parent_inode(dentry); + + /* always trust cached snapped dentries, snapdir dentry */ + if (ceph_snap(dir) != CEPH_NOSNAP) { + dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, + dentry, d_inode(dentry)); + valid = 1; + } else if (d_really_is_positive(dentry) && + ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) { + valid = 1; + } else if (dentry_lease_is_valid(dentry) || + dir_lease_is_valid(dir, dentry)) { + if (d_really_is_positive(dentry)) + valid = ceph_is_any_caps(d_inode(dentry)); + else + valid = 1; + } + + dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); + if (valid) { + ceph_dentry_lru_touch(dentry); + } else { + ceph_dir_clear_complete(dir); + } + iput(dir); + return valid; +} + +/* + * Release our ceph_dentry_info. + */ +static void ceph_d_release(struct dentry *dentry) +{ + struct ceph_dentry_info *di = ceph_dentry(dentry); + + dout("d_release %p\n", dentry); + ceph_dentry_lru_del(dentry); + if (di->lease_session) + ceph_put_mds_session(di->lease_session); + kmem_cache_free(ceph_dentry_cachep, di); + dentry->d_fsdata = NULL; +} + +static int ceph_snapdir_d_revalidate(struct dentry *dentry, + unsigned int flags) +{ + /* + * Eventually, we'll want to revalidate snapped metadata + * too... probably... + */ + return 1; +} + +/* + * When the VFS prunes a dentry from the cache, we need to clear the + * complete flag on the parent directory. + * + * Called under dentry->d_lock. + */ +static void ceph_d_prune(struct dentry *dentry) +{ + dout("ceph_d_prune %p\n", dentry); + + /* do we have a valid parent? */ + if (IS_ROOT(dentry)) + return; + + /* if we are not hashed, we don't affect dir's completeness */ + if (d_unhashed(dentry)) + return; + + /* + * we hold d_lock, so d_parent is stable, and d_fsdata is never + * cleared until d_release + */ + ceph_dir_clear_complete(d_inode(dentry->d_parent)); +} + +/* + * read() on a dir. This weird interface hack only works if mounted + * with '-o dirstat'. + */ +static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, + loff_t *ppos) +{ + struct ceph_file_info *cf = file->private_data; + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + int left; + const int bufsize = 1024; + + if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) + return -EISDIR; + + if (!cf->dir_info) { + cf->dir_info = kmalloc(bufsize, GFP_NOFS); + if (!cf->dir_info) + return -ENOMEM; + cf->dir_info_len = + snprintf(cf->dir_info, bufsize, + "entries: %20lld\n" + " files: %20lld\n" + " subdirs: %20lld\n" + "rentries: %20lld\n" + " rfiles: %20lld\n" + " rsubdirs: %20lld\n" + "rbytes: %20lld\n" + "rctime: %10ld.%09ld\n", + ci->i_files + ci->i_subdirs, + ci->i_files, + ci->i_subdirs, + ci->i_rfiles + ci->i_rsubdirs, + ci->i_rfiles, + ci->i_rsubdirs, + ci->i_rbytes, + (long)ci->i_rctime.tv_sec, + (long)ci->i_rctime.tv_nsec); + } + + if (*ppos >= cf->dir_info_len) + return 0; + size = min_t(unsigned, size, cf->dir_info_len-*ppos); + left = copy_to_user(buf, cf->dir_info + *ppos, size); + if (left == size) + return -EFAULT; + *ppos += (size - left); + return size - left; +} + +/* + * an fsync() on a dir will wait for any uncommitted directory + * operations to commit. + */ +static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, + int datasync) +{ + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct list_head *head = &ci->i_unsafe_dirops; + struct ceph_mds_request *req; + u64 last_tid; + int ret = 0; + + dout("dir_fsync %p\n", inode); + ret = filemap_write_and_wait_range(inode->i_mapping, start, end); + if (ret) + return ret; + mutex_lock(&inode->i_mutex); + + spin_lock(&ci->i_unsafe_lock); + if (list_empty(head)) + goto out; + + req = list_entry(head->prev, + struct ceph_mds_request, r_unsafe_dir_item); + last_tid = req->r_tid; + + do { + ceph_mdsc_get_request(req); + spin_unlock(&ci->i_unsafe_lock); + + dout("dir_fsync %p wait on tid %llu (until %llu)\n", + inode, req->r_tid, last_tid); + if (req->r_timeout) { + unsigned long time_left = wait_for_completion_timeout( + &req->r_safe_completion, + req->r_timeout); + if (time_left > 0) + ret = 0; + else + ret = -EIO; /* timed out */ + } else { + wait_for_completion(&req->r_safe_completion); + } + ceph_mdsc_put_request(req); + + spin_lock(&ci->i_unsafe_lock); + if (ret || list_empty(head)) + break; + req = list_entry(head->next, + struct ceph_mds_request, r_unsafe_dir_item); + } while (req->r_tid < last_tid); +out: + spin_unlock(&ci->i_unsafe_lock); + mutex_unlock(&inode->i_mutex); + + return ret; +} + +/* + * We maintain a private dentry LRU. + * + * FIXME: this needs to be changed to a per-mds lru to be useful. + */ +void ceph_dentry_lru_add(struct dentry *dn) +{ + struct ceph_dentry_info *di = ceph_dentry(dn); + struct ceph_mds_client *mdsc; + + dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn); + mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; + spin_lock(&mdsc->dentry_lru_lock); + list_add_tail(&di->lru, &mdsc->dentry_lru); + mdsc->num_dentry++; + spin_unlock(&mdsc->dentry_lru_lock); +} + +void ceph_dentry_lru_touch(struct dentry *dn) +{ + struct ceph_dentry_info *di = ceph_dentry(dn); + struct ceph_mds_client *mdsc; + + dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn, + di->offset); + mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; + spin_lock(&mdsc->dentry_lru_lock); + list_move_tail(&di->lru, &mdsc->dentry_lru); + spin_unlock(&mdsc->dentry_lru_lock); +} + +void ceph_dentry_lru_del(struct dentry *dn) +{ + struct ceph_dentry_info *di = ceph_dentry(dn); + struct ceph_mds_client *mdsc; + + dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn); + mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; + spin_lock(&mdsc->dentry_lru_lock); + list_del_init(&di->lru); + mdsc->num_dentry--; + spin_unlock(&mdsc->dentry_lru_lock); +} + +/* + * Return name hash for a given dentry. This is dependent on + * the parent directory's hash function. + */ +unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) +{ + struct ceph_inode_info *dci = ceph_inode(dir); + + switch (dci->i_dir_layout.dl_dir_hash) { + case 0: /* for backward compat */ + case CEPH_STR_HASH_LINUX: + return dn->d_name.hash; + + default: + return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, + dn->d_name.name, dn->d_name.len); + } +} + +const struct file_operations ceph_dir_fops = { + .read = ceph_read_dir, + .iterate = ceph_readdir, + .llseek = ceph_dir_llseek, + .open = ceph_open, + .release = ceph_release, + .unlocked_ioctl = ceph_ioctl, + .fsync = ceph_dir_fsync, +}; + +const struct file_operations ceph_snapdir_fops = { + .iterate = ceph_readdir, + .llseek = ceph_dir_llseek, + .open = ceph_open, + .release = ceph_release, +}; + +const struct inode_operations ceph_dir_iops = { + .lookup = ceph_lookup, + .permission = ceph_permission, + .getattr = ceph_getattr, + .setattr = ceph_setattr, + .setxattr = ceph_setxattr, + .getxattr = ceph_getxattr, + .listxattr = ceph_listxattr, + .removexattr = ceph_removexattr, + .get_acl = ceph_get_acl, + .set_acl = ceph_set_acl, + .mknod = ceph_mknod, + .symlink = ceph_symlink, + .mkdir = ceph_mkdir, + .link = ceph_link, + .unlink = ceph_unlink, + .rmdir = ceph_unlink, + .rename = ceph_rename, + .create = ceph_create, + .atomic_open = ceph_atomic_open, +}; + +const struct inode_operations ceph_snapdir_iops = { + .lookup = ceph_lookup, + .permission = ceph_permission, + .getattr = ceph_getattr, + .mkdir = ceph_mkdir, + .rmdir = ceph_unlink, + .rename = ceph_rename, +}; + +const struct dentry_operations ceph_dentry_ops = { + .d_revalidate = ceph_d_revalidate, + .d_release = ceph_d_release, + .d_prune = ceph_d_prune, +}; + +const struct dentry_operations ceph_snapdir_dentry_ops = { + .d_revalidate = ceph_snapdir_d_revalidate, + .d_release = ceph_d_release, +}; + +const struct dentry_operations ceph_snap_dentry_ops = { + .d_release = ceph_d_release, + .d_prune = ceph_d_prune, +}; diff --git a/kernel/fs/ceph/export.c b/kernel/fs/ceph/export.c new file mode 100644 index 000000000..fe02ae7f0 --- /dev/null +++ b/kernel/fs/ceph/export.c @@ -0,0 +1,250 @@ +#include + +#include +#include +#include + +#include "super.h" +#include "mds_client.h" + +/* + * Basic fh + */ +struct ceph_nfs_fh { + u64 ino; +} __attribute__ ((packed)); + +/* + * Larger fh that includes parent ino. + */ +struct ceph_nfs_confh { + u64 ino, parent_ino; +} __attribute__ ((packed)); + +static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len, + struct inode *parent_inode) +{ + int type; + struct ceph_nfs_fh *fh = (void *)rawfh; + struct ceph_nfs_confh *cfh = (void *)rawfh; + int connected_handle_length = sizeof(*cfh)/4; + int handle_length = sizeof(*fh)/4; + + /* don't re-export snaps */ + if (ceph_snap(inode) != CEPH_NOSNAP) + return -EINVAL; + + if (parent_inode && (*max_len < connected_handle_length)) { + *max_len = connected_handle_length; + return FILEID_INVALID; + } else if (*max_len < handle_length) { + *max_len = handle_length; + return FILEID_INVALID; + } + + if (parent_inode) { + dout("encode_fh %llx with parent %llx\n", + ceph_ino(inode), ceph_ino(parent_inode)); + cfh->ino = ceph_ino(inode); + cfh->parent_ino = ceph_ino(parent_inode); + *max_len = connected_handle_length; + type = FILEID_INO32_GEN_PARENT; + } else { + dout("encode_fh %llx\n", ceph_ino(inode)); + fh->ino = ceph_ino(inode); + *max_len = handle_length; + type = FILEID_INO32_GEN; + } + return type; +} + +static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino) +{ + struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; + struct inode *inode; + struct dentry *dentry; + struct ceph_vino vino; + int err; + + vino.ino = ino; + vino.snap = CEPH_NOSNAP; + inode = ceph_find_inode(sb, vino); + if (!inode) { + struct ceph_mds_request *req; + + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO, + USE_ANY_MDS); + if (IS_ERR(req)) + return ERR_CAST(req); + + req->r_ino1 = vino; + req->r_num_caps = 1; + err = ceph_mdsc_do_request(mdsc, NULL, req); + inode = req->r_target_inode; + if (inode) + ihold(inode); + ceph_mdsc_put_request(req); + if (!inode) + return ERR_PTR(-ESTALE); + } + + dentry = d_obtain_alias(inode); + if (IS_ERR(dentry)) { + iput(inode); + return dentry; + } + err = ceph_init_dentry(dentry); + if (err < 0) { + dput(dentry); + return ERR_PTR(err); + } + dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry); + return dentry; +} + +/* + * convert regular fh to dentry + */ +static struct dentry *ceph_fh_to_dentry(struct super_block *sb, + struct fid *fid, + int fh_len, int fh_type) +{ + struct ceph_nfs_fh *fh = (void *)fid->raw; + + if (fh_type != FILEID_INO32_GEN && + fh_type != FILEID_INO32_GEN_PARENT) + return NULL; + if (fh_len < sizeof(*fh) / 4) + return NULL; + + dout("fh_to_dentry %llx\n", fh->ino); + return __fh_to_dentry(sb, fh->ino); +} + +static struct dentry *__get_parent(struct super_block *sb, + struct dentry *child, u64 ino) +{ + struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; + struct ceph_mds_request *req; + struct inode *inode; + struct dentry *dentry; + int err; + + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT, + USE_ANY_MDS); + if (IS_ERR(req)) + return ERR_CAST(req); + + if (child) { + req->r_inode = d_inode(child); + ihold(d_inode(child)); + } else { + req->r_ino1 = (struct ceph_vino) { + .ino = ino, + .snap = CEPH_NOSNAP, + }; + } + req->r_num_caps = 1; + err = ceph_mdsc_do_request(mdsc, NULL, req); + inode = req->r_target_inode; + if (inode) + ihold(inode); + ceph_mdsc_put_request(req); + if (!inode) + return ERR_PTR(-ENOENT); + + dentry = d_obtain_alias(inode); + if (IS_ERR(dentry)) { + iput(inode); + return dentry; + } + err = ceph_init_dentry(dentry); + if (err < 0) { + dput(dentry); + return ERR_PTR(err); + } + dout("__get_parent ino %llx parent %p ino %llx.%llx\n", + child ? ceph_ino(d_inode(child)) : ino, + dentry, ceph_vinop(inode)); + return dentry; +} + +static struct dentry *ceph_get_parent(struct dentry *child) +{ + /* don't re-export snaps */ + if (ceph_snap(d_inode(child)) != CEPH_NOSNAP) + return ERR_PTR(-EINVAL); + + dout("get_parent %p ino %llx.%llx\n", + child, ceph_vinop(d_inode(child))); + return __get_parent(child->d_sb, child, 0); +} + +/* + * convert regular fh to parent + */ +static struct dentry *ceph_fh_to_parent(struct super_block *sb, + struct fid *fid, + int fh_len, int fh_type) +{ + struct ceph_nfs_confh *cfh = (void *)fid->raw; + struct dentry *dentry; + + if (fh_type != FILEID_INO32_GEN_PARENT) + return NULL; + if (fh_len < sizeof(*cfh) / 4) + return NULL; + + dout("fh_to_parent %llx\n", cfh->parent_ino); + dentry = __get_parent(sb, NULL, cfh->ino); + if (IS_ERR(dentry) && PTR_ERR(dentry) == -ENOENT) + dentry = __fh_to_dentry(sb, cfh->parent_ino); + return dentry; +} + +static int ceph_get_name(struct dentry *parent, char *name, + struct dentry *child) +{ + struct ceph_mds_client *mdsc; + struct ceph_mds_request *req; + int err; + + mdsc = ceph_inode_to_client(d_inode(child))->mdsc; + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME, + USE_ANY_MDS); + if (IS_ERR(req)) + return PTR_ERR(req); + + mutex_lock(&d_inode(parent)->i_mutex); + + req->r_inode = d_inode(child); + ihold(d_inode(child)); + req->r_ino2 = ceph_vino(d_inode(parent)); + req->r_locked_dir = d_inode(parent); + req->r_num_caps = 2; + err = ceph_mdsc_do_request(mdsc, NULL, req); + + mutex_unlock(&d_inode(parent)->i_mutex); + + if (!err) { + struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; + memcpy(name, rinfo->dname, rinfo->dname_len); + name[rinfo->dname_len] = 0; + dout("get_name %p ino %llx.%llx name %s\n", + child, ceph_vinop(d_inode(child)), name); + } else { + dout("get_name %p ino %llx.%llx err %d\n", + child, ceph_vinop(d_inode(child)), err); + } + + ceph_mdsc_put_request(req); + return err; +} + +const struct export_operations ceph_export_ops = { + .encode_fh = ceph_encode_fh, + .fh_to_dentry = ceph_fh_to_dentry, + .fh_to_parent = ceph_fh_to_parent, + .get_parent = ceph_get_parent, + .get_name = ceph_get_name, +}; diff --git a/kernel/fs/ceph/file.c b/kernel/fs/ceph/file.c new file mode 100644 index 000000000..3b6b522b4 --- /dev/null +++ b/kernel/fs/ceph/file.c @@ -0,0 +1,1344 @@ +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "super.h" +#include "mds_client.h" +#include "cache.h" + +/* + * Ceph file operations + * + * Implement basic open/close functionality, and implement + * read/write. + * + * We implement three modes of file I/O: + * - buffered uses the generic_file_aio_{read,write} helpers + * + * - synchronous is used when there is multi-client read/write + * sharing, avoids the page cache, and synchronously waits for an + * ack from the OSD. + * + * - direct io takes the variant of the sync path that references + * user pages directly. + * + * fsync() flushes and waits on dirty pages, but just queues metadata + * for writeback: since the MDS can recover size and mtime there is no + * need to wait for MDS acknowledgement. + */ + + +/* + * Prepare an open request. Preallocate ceph_cap to avoid an + * inopportune ENOMEM later. + */ +static struct ceph_mds_request * +prepare_open_request(struct super_block *sb, int flags, int create_mode) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + int want_auth = USE_ANY_MDS; + int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; + + if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) + want_auth = USE_AUTH_MDS; + + req = ceph_mdsc_create_request(mdsc, op, want_auth); + if (IS_ERR(req)) + goto out; + req->r_fmode = ceph_flags_to_mode(flags); + req->r_args.open.flags = cpu_to_le32(flags); + req->r_args.open.mode = cpu_to_le32(create_mode); +out: + return req; +} + +/* + * initialize private struct file data. + * if we fail, clean up by dropping fmode reference on the ceph_inode + */ +static int ceph_init_file(struct inode *inode, struct file *file, int fmode) +{ + struct ceph_file_info *cf; + int ret = 0; + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + + switch (inode->i_mode & S_IFMT) { + case S_IFREG: + /* First file open request creates the cookie, we want to keep + * this cookie around for the filetime of the inode as not to + * have to worry about fscache register / revoke / operation + * races. + * + * Also, if we know the operation is going to invalidate data + * (non readonly) just nuke the cache right away. + */ + ceph_fscache_register_inode_cookie(mdsc->fsc, ci); + if ((fmode & CEPH_FILE_MODE_WR)) + ceph_fscache_invalidate(inode); + case S_IFDIR: + dout("init_file %p %p 0%o (regular)\n", inode, file, + inode->i_mode); + cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO); + if (cf == NULL) { + ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ + return -ENOMEM; + } + cf->fmode = fmode; + cf->next_offset = 2; + file->private_data = cf; + BUG_ON(inode->i_fop->release != ceph_release); + break; + + case S_IFLNK: + dout("init_file %p %p 0%o (symlink)\n", inode, file, + inode->i_mode); + ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ + break; + + default: + dout("init_file %p %p 0%o (special)\n", inode, file, + inode->i_mode); + /* + * we need to drop the open ref now, since we don't + * have .release set to ceph_release. + */ + ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ + BUG_ON(inode->i_fop->release == ceph_release); + + /* call the proper open fop */ + ret = inode->i_fop->open(inode, file); + } + return ret; +} + +/* + * If we already have the requisite capabilities, we can satisfy + * the open request locally (no need to request new caps from the + * MDS). We do, however, need to inform the MDS (asynchronously) + * if our wanted caps set expands. + */ +int ceph_open(struct inode *inode, struct file *file) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + struct ceph_file_info *cf = file->private_data; + struct inode *parent_inode = NULL; + int err; + int flags, fmode, wanted; + + if (cf) { + dout("open file %p is already opened\n", file); + return 0; + } + + /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ + flags = file->f_flags & ~(O_CREAT|O_EXCL); + if (S_ISDIR(inode->i_mode)) + flags = O_DIRECTORY; /* mds likes to know */ + + dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, + ceph_vinop(inode), file, flags, file->f_flags); + fmode = ceph_flags_to_mode(flags); + wanted = ceph_caps_for_mode(fmode); + + /* snapped files are read-only */ + if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) + return -EROFS; + + /* trivially open snapdir */ + if (ceph_snap(inode) == CEPH_SNAPDIR) { + spin_lock(&ci->i_ceph_lock); + __ceph_get_fmode(ci, fmode); + spin_unlock(&ci->i_ceph_lock); + return ceph_init_file(inode, file, fmode); + } + + /* + * No need to block if we have caps on the auth MDS (for + * write) or any MDS (for read). Update wanted set + * asynchronously. + */ + spin_lock(&ci->i_ceph_lock); + if (__ceph_is_any_real_caps(ci) && + (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { + int mds_wanted = __ceph_caps_mds_wanted(ci); + int issued = __ceph_caps_issued(ci, NULL); + + dout("open %p fmode %d want %s issued %s using existing\n", + inode, fmode, ceph_cap_string(wanted), + ceph_cap_string(issued)); + __ceph_get_fmode(ci, fmode); + spin_unlock(&ci->i_ceph_lock); + + /* adjust wanted? */ + if ((issued & wanted) != wanted && + (mds_wanted & wanted) != wanted && + ceph_snap(inode) != CEPH_SNAPDIR) + ceph_check_caps(ci, 0, NULL); + + return ceph_init_file(inode, file, fmode); + } else if (ceph_snap(inode) != CEPH_NOSNAP && + (ci->i_snap_caps & wanted) == wanted) { + __ceph_get_fmode(ci, fmode); + spin_unlock(&ci->i_ceph_lock); + return ceph_init_file(inode, file, fmode); + } + + spin_unlock(&ci->i_ceph_lock); + + dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); + req = prepare_open_request(inode->i_sb, flags, 0); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + req->r_inode = inode; + ihold(inode); + + req->r_num_caps = 1; + if (flags & O_CREAT) + parent_inode = ceph_get_dentry_parent_inode(file->f_path.dentry); + err = ceph_mdsc_do_request(mdsc, parent_inode, req); + iput(parent_inode); + if (!err) + err = ceph_init_file(inode, file, req->r_fmode); + ceph_mdsc_put_request(req); + dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); +out: + return err; +} + + +/* + * Do a lookup + open with a single request. If we get a non-existent + * file or symlink, return 1 so the VFS can retry. + */ +int ceph_atomic_open(struct inode *dir, struct dentry *dentry, + struct file *file, unsigned flags, umode_t mode, + int *opened) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + struct dentry *dn; + struct ceph_acls_info acls = {}; + int err; + + dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n", + dir, dentry, dentry, + d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); + + if (dentry->d_name.len > NAME_MAX) + return -ENAMETOOLONG; + + err = ceph_init_dentry(dentry); + if (err < 0) + return err; + + if (flags & O_CREAT) { + err = ceph_pre_init_acls(dir, &mode, &acls); + if (err < 0) + return err; + } + + /* do the open */ + req = prepare_open_request(dir->i_sb, flags, mode); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out_acl; + } + req->r_dentry = dget(dentry); + req->r_num_caps = 2; + if (flags & O_CREAT) { + req->r_dentry_drop = CEPH_CAP_FILE_SHARED; + req->r_dentry_unless = CEPH_CAP_FILE_EXCL; + if (acls.pagelist) { + req->r_pagelist = acls.pagelist; + acls.pagelist = NULL; + } + } + req->r_locked_dir = dir; /* caller holds dir->i_mutex */ + err = ceph_mdsc_do_request(mdsc, + (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, + req); + err = ceph_handle_snapdir(req, dentry, err); + if (err) + goto out_req; + + if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry) + err = ceph_handle_notrace_create(dir, dentry); + + if (d_unhashed(dentry)) { + dn = ceph_finish_lookup(req, dentry, err); + if (IS_ERR(dn)) + err = PTR_ERR(dn); + } else { + /* we were given a hashed negative dentry */ + dn = NULL; + } + if (err) + goto out_req; + if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) { + /* make vfs retry on splice, ENOENT, or symlink */ + dout("atomic_open finish_no_open on dn %p\n", dn); + err = finish_no_open(file, dn); + } else { + dout("atomic_open finish_open on dn %p\n", dn); + if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { + ceph_init_inode_acls(d_inode(dentry), &acls); + *opened |= FILE_CREATED; + } + err = finish_open(file, dentry, ceph_open, opened); + } +out_req: + if (!req->r_err && req->r_target_inode) + ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode); + ceph_mdsc_put_request(req); +out_acl: + ceph_release_acls_info(&acls); + dout("atomic_open result=%d\n", err); + return err; +} + +int ceph_release(struct inode *inode, struct file *file) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_file_info *cf = file->private_data; + + dout("release inode %p file %p\n", inode, file); + ceph_put_fmode(ci, cf->fmode); + if (cf->last_readdir) + ceph_mdsc_put_request(cf->last_readdir); + kfree(cf->last_name); + kfree(cf->dir_info); + dput(cf->dentry); + kmem_cache_free(ceph_file_cachep, cf); + + /* wake up anyone waiting for caps on this inode */ + wake_up_all(&ci->i_cap_wq); + return 0; +} + +enum { + CHECK_EOF = 1, + READ_INLINE = 2, +}; + +/* + * Read a range of bytes striped over one or more objects. Iterate over + * objects we stripe over. (That's not atomic, but good enough for now.) + * + * If we get a short result from the OSD, check against i_size; we need to + * only return a short read to the caller if we hit EOF. + */ +static int striped_read(struct inode *inode, + u64 off, u64 len, + struct page **pages, int num_pages, + int *checkeof, bool o_direct, + unsigned long buf_align) +{ + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_inode_info *ci = ceph_inode(inode); + u64 pos, this_len, left; + int io_align, page_align; + int pages_left; + int read; + struct page **page_pos; + int ret; + bool hit_stripe, was_short; + + /* + * we may need to do multiple reads. not atomic, unfortunately. + */ + pos = off; + left = len; + page_pos = pages; + pages_left = num_pages; + read = 0; + io_align = off & ~PAGE_MASK; + +more: + if (o_direct) + page_align = (pos - io_align + buf_align) & ~PAGE_MASK; + else + page_align = pos & ~PAGE_MASK; + this_len = left; + ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), + &ci->i_layout, pos, &this_len, + ci->i_truncate_seq, + ci->i_truncate_size, + page_pos, pages_left, page_align); + if (ret == -ENOENT) + ret = 0; + hit_stripe = this_len < left; + was_short = ret >= 0 && ret < this_len; + dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read, + ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); + + if (ret >= 0) { + int didpages; + if (was_short && (pos + ret < inode->i_size)) { + int zlen = min(this_len - ret, + inode->i_size - pos - ret); + int zoff = (o_direct ? buf_align : io_align) + + read + ret; + dout(" zero gap %llu to %llu\n", + pos + ret, pos + ret + zlen); + ceph_zero_page_vector_range(zoff, zlen, pages); + ret += zlen; + } + + didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; + pos += ret; + read = pos - off; + left -= ret; + page_pos += didpages; + pages_left -= didpages; + + /* hit stripe and need continue*/ + if (left && hit_stripe && pos < inode->i_size) + goto more; + } + + if (read > 0) { + ret = read; + /* did we bounce off eof? */ + if (pos + left > inode->i_size) + *checkeof = CHECK_EOF; + } + + dout("striped_read returns %d\n", ret); + return ret; +} + +/* + * Completely synchronous read and write methods. Direct from __user + * buffer to osd, or directly to user pages (if O_DIRECT). + * + * If the read spans object boundary, just do multiple reads. + */ +static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i, + int *checkeof) +{ + struct file *file = iocb->ki_filp; + struct inode *inode = file_inode(file); + struct page **pages; + u64 off = iocb->ki_pos; + int num_pages, ret; + size_t len = iov_iter_count(i); + + dout("sync_read on file %p %llu~%u %s\n", file, off, + (unsigned)len, + (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); + + if (!len) + return 0; + /* + * flush any page cache pages in this range. this + * will make concurrent normal and sync io slow, + * but it will at least behave sensibly when they are + * in sequence. + */ + ret = filemap_write_and_wait_range(inode->i_mapping, off, + off + len); + if (ret < 0) + return ret; + + if (iocb->ki_flags & IOCB_DIRECT) { + while (iov_iter_count(i)) { + size_t start; + ssize_t n; + + n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start); + if (n < 0) + return n; + + num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; + + ret = striped_read(inode, off, n, + pages, num_pages, checkeof, + 1, start); + + ceph_put_page_vector(pages, num_pages, true); + + if (ret <= 0) + break; + off += ret; + iov_iter_advance(i, ret); + if (ret < n) + break; + } + } else { + num_pages = calc_pages_for(off, len); + pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); + if (IS_ERR(pages)) + return PTR_ERR(pages); + ret = striped_read(inode, off, len, pages, + num_pages, checkeof, 0, 0); + if (ret > 0) { + int l, k = 0; + size_t left = ret; + + while (left) { + size_t page_off = off & ~PAGE_MASK; + size_t copy = min_t(size_t, + PAGE_SIZE - page_off, left); + l = copy_page_to_iter(pages[k++], page_off, + copy, i); + off += l; + left -= l; + if (l < copy) + break; + } + } + ceph_release_page_vector(pages, num_pages); + } + + if (off > iocb->ki_pos) { + ret = off - iocb->ki_pos; + iocb->ki_pos = off; + } + + dout("sync_read result %d\n", ret); + return ret; +} + +/* + * Write commit request unsafe callback, called to tell us when a + * request is unsafe (that is, in flight--has been handed to the + * messenger to send to its target osd). It is called again when + * we've received a response message indicating the request is + * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request + * is completed early (and unsuccessfully) due to a timeout or + * interrupt. + * + * This is used if we requested both an ACK and ONDISK commit reply + * from the OSD. + */ +static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) +{ + struct ceph_inode_info *ci = ceph_inode(req->r_inode); + + dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, + unsafe ? "un" : ""); + if (unsafe) { + ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); + spin_lock(&ci->i_unsafe_lock); + list_add_tail(&req->r_unsafe_item, + &ci->i_unsafe_writes); + spin_unlock(&ci->i_unsafe_lock); + } else { + spin_lock(&ci->i_unsafe_lock); + list_del_init(&req->r_unsafe_item); + spin_unlock(&ci->i_unsafe_lock); + ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); + } +} + + +/* + * Synchronous write, straight from __user pointer or user pages. + * + * If write spans object boundary, just do multiple writes. (For a + * correct atomic write, we should e.g. take write locks on all + * objects, rollback on failure, etc.) + */ +static ssize_t +ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos) +{ + struct file *file = iocb->ki_filp; + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_snap_context *snapc; + struct ceph_vino vino; + struct ceph_osd_request *req; + struct page **pages; + int num_pages; + int written = 0; + int flags; + int check_caps = 0; + int ret; + struct timespec mtime = CURRENT_TIME; + size_t count = iov_iter_count(from); + + if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) + return -EROFS; + + dout("sync_direct_write on file %p %lld~%u\n", file, pos, + (unsigned)count); + + ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); + if (ret < 0) + return ret; + + ret = invalidate_inode_pages2_range(inode->i_mapping, + pos >> PAGE_CACHE_SHIFT, + (pos + count) >> PAGE_CACHE_SHIFT); + if (ret < 0) + dout("invalidate_inode_pages2_range returned %d\n", ret); + + flags = CEPH_OSD_FLAG_ORDERSNAP | + CEPH_OSD_FLAG_ONDISK | + CEPH_OSD_FLAG_WRITE; + + while (iov_iter_count(from) > 0) { + u64 len = iov_iter_single_seg_count(from); + size_t start; + ssize_t n; + + snapc = ci->i_snap_realm->cached_context; + vino = ceph_vino(inode); + req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, + vino, pos, &len, 0, + 2,/*include a 'startsync' command*/ + CEPH_OSD_OP_WRITE, flags, snapc, + ci->i_truncate_seq, + ci->i_truncate_size, + false); + if (IS_ERR(req)) { + ret = PTR_ERR(req); + break; + } + + osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC); + + n = iov_iter_get_pages_alloc(from, &pages, len, &start); + if (unlikely(n < 0)) { + ret = n; + ceph_osdc_put_request(req); + break; + } + + num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; + /* + * throw out any page cache pages in this range. this + * may block. + */ + truncate_inode_pages_range(inode->i_mapping, pos, + (pos+n) | (PAGE_CACHE_SIZE-1)); + osd_req_op_extent_osd_data_pages(req, 0, pages, n, start, + false, false); + + /* BUG_ON(vino.snap != CEPH_NOSNAP); */ + ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); + + ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); + if (!ret) + ret = ceph_osdc_wait_request(&fsc->client->osdc, req); + + ceph_put_page_vector(pages, num_pages, false); + + ceph_osdc_put_request(req); + if (ret) + break; + pos += n; + written += n; + iov_iter_advance(from, n); + + if (pos > i_size_read(inode)) { + check_caps = ceph_inode_set_size(inode, pos); + if (check_caps) + ceph_check_caps(ceph_inode(inode), + CHECK_CAPS_AUTHONLY, + NULL); + } + } + + if (ret != -EOLDSNAPC && written > 0) { + iocb->ki_pos = pos; + ret = written; + } + return ret; +} + + +/* + * Synchronous write, straight from __user pointer or user pages. + * + * If write spans object boundary, just do multiple writes. (For a + * correct atomic write, we should e.g. take write locks on all + * objects, rollback on failure, etc.) + */ +static ssize_t +ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos) +{ + struct file *file = iocb->ki_filp; + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_snap_context *snapc; + struct ceph_vino vino; + struct ceph_osd_request *req; + struct page **pages; + u64 len; + int num_pages; + int written = 0; + int flags; + int check_caps = 0; + int ret; + struct timespec mtime = CURRENT_TIME; + size_t count = iov_iter_count(from); + + if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) + return -EROFS; + + dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count); + + ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); + if (ret < 0) + return ret; + + ret = invalidate_inode_pages2_range(inode->i_mapping, + pos >> PAGE_CACHE_SHIFT, + (pos + count) >> PAGE_CACHE_SHIFT); + if (ret < 0) + dout("invalidate_inode_pages2_range returned %d\n", ret); + + flags = CEPH_OSD_FLAG_ORDERSNAP | + CEPH_OSD_FLAG_ONDISK | + CEPH_OSD_FLAG_WRITE | + CEPH_OSD_FLAG_ACK; + + while ((len = iov_iter_count(from)) > 0) { + size_t left; + int n; + + snapc = ci->i_snap_realm->cached_context; + vino = ceph_vino(inode); + req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, + vino, pos, &len, 0, 1, + CEPH_OSD_OP_WRITE, flags, snapc, + ci->i_truncate_seq, + ci->i_truncate_size, + false); + if (IS_ERR(req)) { + ret = PTR_ERR(req); + break; + } + + /* + * write from beginning of first page, + * regardless of io alignment + */ + num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; + + pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); + if (IS_ERR(pages)) { + ret = PTR_ERR(pages); + goto out; + } + + left = len; + for (n = 0; n < num_pages; n++) { + size_t plen = min_t(size_t, left, PAGE_SIZE); + ret = copy_page_from_iter(pages[n], 0, plen, from); + if (ret != plen) { + ret = -EFAULT; + break; + } + left -= ret; + } + + if (ret < 0) { + ceph_release_page_vector(pages, num_pages); + goto out; + } + + /* get a second commit callback */ + req->r_unsafe_callback = ceph_sync_write_unsafe; + req->r_inode = inode; + + osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, + false, true); + + /* BUG_ON(vino.snap != CEPH_NOSNAP); */ + ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); + + ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); + if (!ret) + ret = ceph_osdc_wait_request(&fsc->client->osdc, req); + +out: + ceph_osdc_put_request(req); + if (ret == 0) { + pos += len; + written += len; + + if (pos > i_size_read(inode)) { + check_caps = ceph_inode_set_size(inode, pos); + if (check_caps) + ceph_check_caps(ceph_inode(inode), + CHECK_CAPS_AUTHONLY, + NULL); + } + } else + break; + } + + if (ret != -EOLDSNAPC && written > 0) { + ret = written; + iocb->ki_pos = pos; + } + return ret; +} + +/* + * Wrap generic_file_aio_read with checks for cap bits on the inode. + * Atomically grab references, so that those bits are not released + * back to the MDS mid-read. + * + * Hmm, the sync read case isn't actually async... should it be? + */ +static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) +{ + struct file *filp = iocb->ki_filp; + struct ceph_file_info *fi = filp->private_data; + size_t len = iov_iter_count(to); + struct inode *inode = file_inode(filp); + struct ceph_inode_info *ci = ceph_inode(inode); + struct page *pinned_page = NULL; + ssize_t ret; + int want, got = 0; + int retry_op = 0, read = 0; + +again: + dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", + inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); + + if (fi->fmode & CEPH_FILE_MODE_LAZY) + want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; + else + want = CEPH_CAP_FILE_CACHE; + ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); + if (ret < 0) + return ret; + + if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || + (iocb->ki_flags & IOCB_DIRECT) || + (fi->flags & CEPH_F_SYNC)) { + + dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n", + inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, + ceph_cap_string(got)); + + if (ci->i_inline_version == CEPH_INLINE_NONE) { + /* hmm, this isn't really async... */ + ret = ceph_sync_read(iocb, to, &retry_op); + } else { + retry_op = READ_INLINE; + } + } else { + dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", + inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, + ceph_cap_string(got)); + + ret = generic_file_read_iter(iocb, to); + } + dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", + inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); + if (pinned_page) { + page_cache_release(pinned_page); + pinned_page = NULL; + } + ceph_put_cap_refs(ci, got); + if (retry_op && ret >= 0) { + int statret; + struct page *page = NULL; + loff_t i_size; + if (retry_op == READ_INLINE) { + page = __page_cache_alloc(GFP_NOFS); + if (!page) + return -ENOMEM; + } + + statret = __ceph_do_getattr(inode, page, + CEPH_STAT_CAP_INLINE_DATA, !!page); + if (statret < 0) { + __free_page(page); + if (statret == -ENODATA) { + BUG_ON(retry_op != READ_INLINE); + goto again; + } + return statret; + } + + i_size = i_size_read(inode); + if (retry_op == READ_INLINE) { + BUG_ON(ret > 0 || read > 0); + if (iocb->ki_pos < i_size && + iocb->ki_pos < PAGE_CACHE_SIZE) { + loff_t end = min_t(loff_t, i_size, + iocb->ki_pos + len); + end = min_t(loff_t, end, PAGE_CACHE_SIZE); + if (statret < end) + zero_user_segment(page, statret, end); + ret = copy_page_to_iter(page, + iocb->ki_pos & ~PAGE_MASK, + end - iocb->ki_pos, to); + iocb->ki_pos += ret; + read += ret; + } + if (iocb->ki_pos < i_size && read < len) { + size_t zlen = min_t(size_t, len - read, + i_size - iocb->ki_pos); + ret = iov_iter_zero(zlen, to); + iocb->ki_pos += ret; + read += ret; + } + __free_pages(page, 0); + return read; + } + + /* hit EOF or hole? */ + if (retry_op == CHECK_EOF && iocb->ki_pos < i_size && + ret < len) { + dout("sync_read hit hole, ppos %lld < size %lld" + ", reading more\n", iocb->ki_pos, + inode->i_size); + + read += ret; + len -= ret; + retry_op = 0; + goto again; + } + } + + if (ret >= 0) + ret += read; + + return ret; +} + +/* + * Take cap references to avoid releasing caps to MDS mid-write. + * + * If we are synchronous, and write with an old snap context, the OSD + * may return EOLDSNAPC. In that case, retry the write.. _after_ + * dropping our cap refs and allowing the pending snap to logically + * complete _before_ this write occurs. + * + * If we are near ENOSPC, write synchronously. + */ +static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) +{ + struct file *file = iocb->ki_filp; + struct ceph_file_info *fi = file->private_data; + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_osd_client *osdc = + &ceph_sb_to_client(inode->i_sb)->client->osdc; + ssize_t count, written = 0; + int err, want, got; + loff_t pos; + + if (ceph_snap(inode) != CEPH_NOSNAP) + return -EROFS; + + mutex_lock(&inode->i_mutex); + + /* We can write back this queue in page reclaim */ + current->backing_dev_info = inode_to_bdi(inode); + + err = generic_write_checks(iocb, from); + if (err <= 0) + goto out; + + pos = iocb->ki_pos; + count = iov_iter_count(from); + err = file_remove_suid(file); + if (err) + goto out; + + err = file_update_time(file); + if (err) + goto out; + + if (ci->i_inline_version != CEPH_INLINE_NONE) { + err = ceph_uninline_data(file, NULL); + if (err < 0) + goto out; + } + +retry_snap: + if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) { + err = -ENOSPC; + goto out; + } + + dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", + inode, ceph_vinop(inode), pos, count, inode->i_size); + if (fi->fmode & CEPH_FILE_MODE_LAZY) + want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; + else + want = CEPH_CAP_FILE_BUFFER; + got = 0; + err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count, + &got, NULL); + if (err < 0) + goto out; + + dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", + inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); + + if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || + (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) { + struct iov_iter data; + mutex_unlock(&inode->i_mutex); + /* we might need to revert back to that point */ + data = *from; + if (iocb->ki_flags & IOCB_DIRECT) + written = ceph_sync_direct_write(iocb, &data, pos); + else + written = ceph_sync_write(iocb, &data, pos); + if (written == -EOLDSNAPC) { + dout("aio_write %p %llx.%llx %llu~%u" + "got EOLDSNAPC, retrying\n", + inode, ceph_vinop(inode), + pos, (unsigned)count); + mutex_lock(&inode->i_mutex); + goto retry_snap; + } + if (written > 0) + iov_iter_advance(from, written); + } else { + loff_t old_size = inode->i_size; + /* + * No need to acquire the i_truncate_mutex. Because + * the MDS revokes Fwb caps before sending truncate + * message to us. We can't get Fwb cap while there + * are pending vmtruncate. So write and vmtruncate + * can not run at the same time + */ + written = generic_perform_write(file, from, pos); + if (likely(written >= 0)) + iocb->ki_pos = pos + written; + if (inode->i_size > old_size) + ceph_fscache_update_objectsize(inode); + mutex_unlock(&inode->i_mutex); + } + + if (written >= 0) { + int dirty; + spin_lock(&ci->i_ceph_lock); + ci->i_inline_version = CEPH_INLINE_NONE; + dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); + spin_unlock(&ci->i_ceph_lock); + if (dirty) + __mark_inode_dirty(inode, dirty); + } + + dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", + inode, ceph_vinop(inode), pos, (unsigned)count, + ceph_cap_string(got)); + ceph_put_cap_refs(ci, got); + + if (written >= 0 && + ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) || + ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { + err = vfs_fsync_range(file, pos, pos + written - 1, 1); + if (err < 0) + written = err; + } + + goto out_unlocked; + +out: + mutex_unlock(&inode->i_mutex); +out_unlocked: + current->backing_dev_info = NULL; + return written ? written : err; +} + +/* + * llseek. be sure to verify file size on SEEK_END. + */ +static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) +{ + struct inode *inode = file->f_mapping->host; + int ret; + + mutex_lock(&inode->i_mutex); + + if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { + ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); + if (ret < 0) { + offset = ret; + goto out; + } + } + + switch (whence) { + case SEEK_END: + offset += inode->i_size; + break; + case SEEK_CUR: + /* + * Here we special-case the lseek(fd, 0, SEEK_CUR) + * position-querying operation. Avoid rewriting the "same" + * f_pos value back to the file because a concurrent read(), + * write() or lseek() might have altered it + */ + if (offset == 0) { + offset = file->f_pos; + goto out; + } + offset += file->f_pos; + break; + case SEEK_DATA: + if (offset >= inode->i_size) { + ret = -ENXIO; + goto out; + } + break; + case SEEK_HOLE: + if (offset >= inode->i_size) { + ret = -ENXIO; + goto out; + } + offset = inode->i_size; + break; + } + + offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); + +out: + mutex_unlock(&inode->i_mutex); + return offset; +} + +static inline void ceph_zero_partial_page( + struct inode *inode, loff_t offset, unsigned size) +{ + struct page *page; + pgoff_t index = offset >> PAGE_CACHE_SHIFT; + + page = find_lock_page(inode->i_mapping, index); + if (page) { + wait_on_page_writeback(page); + zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size); + unlock_page(page); + page_cache_release(page); + } +} + +static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, + loff_t length) +{ + loff_t nearly = round_up(offset, PAGE_CACHE_SIZE); + if (offset < nearly) { + loff_t size = nearly - offset; + if (length < size) + size = length; + ceph_zero_partial_page(inode, offset, size); + offset += size; + length -= size; + } + if (length >= PAGE_CACHE_SIZE) { + loff_t size = round_down(length, PAGE_CACHE_SIZE); + truncate_pagecache_range(inode, offset, offset + size - 1); + offset += size; + length -= size; + } + if (length) + ceph_zero_partial_page(inode, offset, length); +} + +static int ceph_zero_partial_object(struct inode *inode, + loff_t offset, loff_t *length) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_osd_request *req; + int ret = 0; + loff_t zero = 0; + int op; + + if (!length) { + op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; + length = &zero; + } else { + op = CEPH_OSD_OP_ZERO; + } + + req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, + ceph_vino(inode), + offset, length, + 0, 1, op, + CEPH_OSD_FLAG_WRITE | + CEPH_OSD_FLAG_ONDISK, + NULL, 0, 0, false); + if (IS_ERR(req)) { + ret = PTR_ERR(req); + goto out; + } + + ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap, + &inode->i_mtime); + + ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); + if (!ret) { + ret = ceph_osdc_wait_request(&fsc->client->osdc, req); + if (ret == -ENOENT) + ret = 0; + } + ceph_osdc_put_request(req); + +out: + return ret; +} + +static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) +{ + int ret = 0; + struct ceph_inode_info *ci = ceph_inode(inode); + s32 stripe_unit = ceph_file_layout_su(ci->i_layout); + s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout); + s32 object_size = ceph_file_layout_object_size(ci->i_layout); + u64 object_set_size = object_size * stripe_count; + u64 nearly, t; + + /* round offset up to next period boundary */ + nearly = offset + object_set_size - 1; + t = nearly; + nearly -= do_div(t, object_set_size); + + while (length && offset < nearly) { + loff_t size = length; + ret = ceph_zero_partial_object(inode, offset, &size); + if (ret < 0) + return ret; + offset += size; + length -= size; + } + while (length >= object_set_size) { + int i; + loff_t pos = offset; + for (i = 0; i < stripe_count; ++i) { + ret = ceph_zero_partial_object(inode, pos, NULL); + if (ret < 0) + return ret; + pos += stripe_unit; + } + offset += object_set_size; + length -= object_set_size; + } + while (length) { + loff_t size = length; + ret = ceph_zero_partial_object(inode, offset, &size); + if (ret < 0) + return ret; + offset += size; + length -= size; + } + return ret; +} + +static long ceph_fallocate(struct file *file, int mode, + loff_t offset, loff_t length) +{ + struct ceph_file_info *fi = file->private_data; + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_osd_client *osdc = + &ceph_inode_to_client(inode)->client->osdc; + int want, got = 0; + int dirty; + int ret = 0; + loff_t endoff = 0; + loff_t size; + + if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) + return -EOPNOTSUPP; + + if (!S_ISREG(inode->i_mode)) + return -EOPNOTSUPP; + + mutex_lock(&inode->i_mutex); + + if (ceph_snap(inode) != CEPH_NOSNAP) { + ret = -EROFS; + goto unlock; + } + + if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) && + !(mode & FALLOC_FL_PUNCH_HOLE)) { + ret = -ENOSPC; + goto unlock; + } + + if (ci->i_inline_version != CEPH_INLINE_NONE) { + ret = ceph_uninline_data(file, NULL); + if (ret < 0) + goto unlock; + } + + size = i_size_read(inode); + if (!(mode & FALLOC_FL_KEEP_SIZE)) + endoff = offset + length; + + if (fi->fmode & CEPH_FILE_MODE_LAZY) + want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; + else + want = CEPH_CAP_FILE_BUFFER; + + ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL); + if (ret < 0) + goto unlock; + + if (mode & FALLOC_FL_PUNCH_HOLE) { + if (offset < size) + ceph_zero_pagecache_range(inode, offset, length); + ret = ceph_zero_objects(inode, offset, length); + } else if (endoff > size) { + truncate_pagecache_range(inode, size, -1); + if (ceph_inode_set_size(inode, endoff)) + ceph_check_caps(ceph_inode(inode), + CHECK_CAPS_AUTHONLY, NULL); + } + + if (!ret) { + spin_lock(&ci->i_ceph_lock); + ci->i_inline_version = CEPH_INLINE_NONE; + dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); + spin_unlock(&ci->i_ceph_lock); + if (dirty) + __mark_inode_dirty(inode, dirty); + } + + ceph_put_cap_refs(ci, got); +unlock: + mutex_unlock(&inode->i_mutex); + return ret; +} + +const struct file_operations ceph_file_fops = { + .open = ceph_open, + .release = ceph_release, + .llseek = ceph_llseek, + .read_iter = ceph_read_iter, + .write_iter = ceph_write_iter, + .mmap = ceph_mmap, + .fsync = ceph_fsync, + .lock = ceph_lock, + .flock = ceph_flock, + .splice_read = generic_file_splice_read, + .splice_write = iter_file_splice_write, + .unlocked_ioctl = ceph_ioctl, + .compat_ioctl = ceph_ioctl, + .fallocate = ceph_fallocate, +}; + diff --git a/kernel/fs/ceph/inode.c b/kernel/fs/ceph/inode.c new file mode 100644 index 000000000..e876e1944 --- /dev/null +++ b/kernel/fs/ceph/inode.c @@ -0,0 +1,2016 @@ +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "super.h" +#include "mds_client.h" +#include "cache.h" +#include + +/* + * Ceph inode operations + * + * Implement basic inode helpers (get, alloc) and inode ops (getattr, + * setattr, etc.), xattr helpers, and helpers for assimilating + * metadata returned by the MDS into our cache. + * + * Also define helpers for doing asynchronous writeback, invalidation, + * and truncation for the benefit of those who can't afford to block + * (typically because they are in the message handler path). + */ + +static const struct inode_operations ceph_symlink_iops; + +static void ceph_invalidate_work(struct work_struct *work); +static void ceph_writeback_work(struct work_struct *work); +static void ceph_vmtruncate_work(struct work_struct *work); + +/* + * find or create an inode, given the ceph ino number + */ +static int ceph_set_ino_cb(struct inode *inode, void *data) +{ + ceph_inode(inode)->i_vino = *(struct ceph_vino *)data; + inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); + return 0; +} + +struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino) +{ + struct inode *inode; + ino_t t = ceph_vino_to_ino(vino); + + inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino); + if (inode == NULL) + return ERR_PTR(-ENOMEM); + if (inode->i_state & I_NEW) { + dout("get_inode created new inode %p %llx.%llx ino %llx\n", + inode, ceph_vinop(inode), (u64)inode->i_ino); + unlock_new_inode(inode); + } + + dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino, + vino.snap, inode); + return inode; +} + +/* + * get/constuct snapdir inode for a given directory + */ +struct inode *ceph_get_snapdir(struct inode *parent) +{ + struct ceph_vino vino = { + .ino = ceph_ino(parent), + .snap = CEPH_SNAPDIR, + }; + struct inode *inode = ceph_get_inode(parent->i_sb, vino); + struct ceph_inode_info *ci = ceph_inode(inode); + + BUG_ON(!S_ISDIR(parent->i_mode)); + if (IS_ERR(inode)) + return inode; + inode->i_mode = parent->i_mode; + inode->i_uid = parent->i_uid; + inode->i_gid = parent->i_gid; + inode->i_op = &ceph_snapdir_iops; + inode->i_fop = &ceph_snapdir_fops; + ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */ + ci->i_rbytes = 0; + return inode; +} + +const struct inode_operations ceph_file_iops = { + .permission = ceph_permission, + .setattr = ceph_setattr, + .getattr = ceph_getattr, + .setxattr = ceph_setxattr, + .getxattr = ceph_getxattr, + .listxattr = ceph_listxattr, + .removexattr = ceph_removexattr, + .get_acl = ceph_get_acl, + .set_acl = ceph_set_acl, +}; + + +/* + * We use a 'frag tree' to keep track of the MDS's directory fragments + * for a given inode (usually there is just a single fragment). We + * need to know when a child frag is delegated to a new MDS, or when + * it is flagged as replicated, so we can direct our requests + * accordingly. + */ + +/* + * find/create a frag in the tree + */ +static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci, + u32 f) +{ + struct rb_node **p; + struct rb_node *parent = NULL; + struct ceph_inode_frag *frag; + int c; + + p = &ci->i_fragtree.rb_node; + while (*p) { + parent = *p; + frag = rb_entry(parent, struct ceph_inode_frag, node); + c = ceph_frag_compare(f, frag->frag); + if (c < 0) + p = &(*p)->rb_left; + else if (c > 0) + p = &(*p)->rb_right; + else + return frag; + } + + frag = kmalloc(sizeof(*frag), GFP_NOFS); + if (!frag) { + pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx " + "frag %x\n", &ci->vfs_inode, + ceph_vinop(&ci->vfs_inode), f); + return ERR_PTR(-ENOMEM); + } + frag->frag = f; + frag->split_by = 0; + frag->mds = -1; + frag->ndist = 0; + + rb_link_node(&frag->node, parent, p); + rb_insert_color(&frag->node, &ci->i_fragtree); + + dout("get_or_create_frag added %llx.%llx frag %x\n", + ceph_vinop(&ci->vfs_inode), f); + return frag; +} + +/* + * find a specific frag @f + */ +struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f) +{ + struct rb_node *n = ci->i_fragtree.rb_node; + + while (n) { + struct ceph_inode_frag *frag = + rb_entry(n, struct ceph_inode_frag, node); + int c = ceph_frag_compare(f, frag->frag); + if (c < 0) + n = n->rb_left; + else if (c > 0) + n = n->rb_right; + else + return frag; + } + return NULL; +} + +/* + * Choose frag containing the given value @v. If @pfrag is + * specified, copy the frag delegation info to the caller if + * it is present. + */ +static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v, + struct ceph_inode_frag *pfrag, int *found) +{ + u32 t = ceph_frag_make(0, 0); + struct ceph_inode_frag *frag; + unsigned nway, i; + u32 n; + + if (found) + *found = 0; + + while (1) { + WARN_ON(!ceph_frag_contains_value(t, v)); + frag = __ceph_find_frag(ci, t); + if (!frag) + break; /* t is a leaf */ + if (frag->split_by == 0) { + if (pfrag) + memcpy(pfrag, frag, sizeof(*pfrag)); + if (found) + *found = 1; + break; + } + + /* choose child */ + nway = 1 << frag->split_by; + dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t, + frag->split_by, nway); + for (i = 0; i < nway; i++) { + n = ceph_frag_make_child(t, frag->split_by, i); + if (ceph_frag_contains_value(n, v)) { + t = n; + break; + } + } + BUG_ON(i == nway); + } + dout("choose_frag(%x) = %x\n", v, t); + + return t; +} + +u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, + struct ceph_inode_frag *pfrag, int *found) +{ + u32 ret; + mutex_lock(&ci->i_fragtree_mutex); + ret = __ceph_choose_frag(ci, v, pfrag, found); + mutex_unlock(&ci->i_fragtree_mutex); + return ret; +} + +/* + * Process dirfrag (delegation) info from the mds. Include leaf + * fragment in tree ONLY if ndist > 0. Otherwise, only + * branches/splits are included in i_fragtree) + */ +static int ceph_fill_dirfrag(struct inode *inode, + struct ceph_mds_reply_dirfrag *dirinfo) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_inode_frag *frag; + u32 id = le32_to_cpu(dirinfo->frag); + int mds = le32_to_cpu(dirinfo->auth); + int ndist = le32_to_cpu(dirinfo->ndist); + int diri_auth = -1; + int i; + int err = 0; + + spin_lock(&ci->i_ceph_lock); + if (ci->i_auth_cap) + diri_auth = ci->i_auth_cap->mds; + spin_unlock(&ci->i_ceph_lock); + + mutex_lock(&ci->i_fragtree_mutex); + if (ndist == 0 && mds == diri_auth) { + /* no delegation info needed. */ + frag = __ceph_find_frag(ci, id); + if (!frag) + goto out; + if (frag->split_by == 0) { + /* tree leaf, remove */ + dout("fill_dirfrag removed %llx.%llx frag %x" + " (no ref)\n", ceph_vinop(inode), id); + rb_erase(&frag->node, &ci->i_fragtree); + kfree(frag); + } else { + /* tree branch, keep and clear */ + dout("fill_dirfrag cleared %llx.%llx frag %x" + " referral\n", ceph_vinop(inode), id); + frag->mds = -1; + frag->ndist = 0; + } + goto out; + } + + + /* find/add this frag to store mds delegation info */ + frag = __get_or_create_frag(ci, id); + if (IS_ERR(frag)) { + /* this is not the end of the world; we can continue + with bad/inaccurate delegation info */ + pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n", + ceph_vinop(inode), le32_to_cpu(dirinfo->frag)); + err = -ENOMEM; + goto out; + } + + frag->mds = mds; + frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP); + for (i = 0; i < frag->ndist; i++) + frag->dist[i] = le32_to_cpu(dirinfo->dist[i]); + dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n", + ceph_vinop(inode), frag->frag, frag->ndist); + +out: + mutex_unlock(&ci->i_fragtree_mutex); + return err; +} + +static int ceph_fill_fragtree(struct inode *inode, + struct ceph_frag_tree_head *fragtree, + struct ceph_mds_reply_dirfrag *dirinfo) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_inode_frag *frag; + struct rb_node *rb_node; + int i; + u32 id, nsplits; + bool update = false; + + mutex_lock(&ci->i_fragtree_mutex); + nsplits = le32_to_cpu(fragtree->nsplits); + if (nsplits) { + i = prandom_u32() % nsplits; + id = le32_to_cpu(fragtree->splits[i].frag); + if (!__ceph_find_frag(ci, id)) + update = true; + } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) { + rb_node = rb_first(&ci->i_fragtree); + frag = rb_entry(rb_node, struct ceph_inode_frag, node); + if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node)) + update = true; + } + if (!update && dirinfo) { + id = le32_to_cpu(dirinfo->frag); + if (id != __ceph_choose_frag(ci, id, NULL, NULL)) + update = true; + } + if (!update) + goto out_unlock; + + dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode)); + rb_node = rb_first(&ci->i_fragtree); + for (i = 0; i < nsplits; i++) { + id = le32_to_cpu(fragtree->splits[i].frag); + frag = NULL; + while (rb_node) { + frag = rb_entry(rb_node, struct ceph_inode_frag, node); + if (ceph_frag_compare(frag->frag, id) >= 0) { + if (frag->frag != id) + frag = NULL; + else + rb_node = rb_next(rb_node); + break; + } + rb_node = rb_next(rb_node); + rb_erase(&frag->node, &ci->i_fragtree); + kfree(frag); + frag = NULL; + } + if (!frag) { + frag = __get_or_create_frag(ci, id); + if (IS_ERR(frag)) + continue; + } + frag->split_by = le32_to_cpu(fragtree->splits[i].by); + dout(" frag %x split by %d\n", frag->frag, frag->split_by); + } + while (rb_node) { + frag = rb_entry(rb_node, struct ceph_inode_frag, node); + rb_node = rb_next(rb_node); + rb_erase(&frag->node, &ci->i_fragtree); + kfree(frag); + } +out_unlock: + mutex_unlock(&ci->i_fragtree_mutex); + return 0; +} + +/* + * initialize a newly allocated inode. + */ +struct inode *ceph_alloc_inode(struct super_block *sb) +{ + struct ceph_inode_info *ci; + int i; + + ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS); + if (!ci) + return NULL; + + dout("alloc_inode %p\n", &ci->vfs_inode); + + spin_lock_init(&ci->i_ceph_lock); + + ci->i_version = 0; + ci->i_inline_version = 0; + ci->i_time_warp_seq = 0; + ci->i_ceph_flags = 0; + ci->i_ordered_count = 0; + atomic_set(&ci->i_release_count, 1); + atomic_set(&ci->i_complete_count, 0); + ci->i_symlink = NULL; + + memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout)); + + ci->i_fragtree = RB_ROOT; + mutex_init(&ci->i_fragtree_mutex); + + ci->i_xattrs.blob = NULL; + ci->i_xattrs.prealloc_blob = NULL; + ci->i_xattrs.dirty = false; + ci->i_xattrs.index = RB_ROOT; + ci->i_xattrs.count = 0; + ci->i_xattrs.names_size = 0; + ci->i_xattrs.vals_size = 0; + ci->i_xattrs.version = 0; + ci->i_xattrs.index_version = 0; + + ci->i_caps = RB_ROOT; + ci->i_auth_cap = NULL; + ci->i_dirty_caps = 0; + ci->i_flushing_caps = 0; + INIT_LIST_HEAD(&ci->i_dirty_item); + INIT_LIST_HEAD(&ci->i_flushing_item); + ci->i_cap_flush_seq = 0; + ci->i_cap_flush_last_tid = 0; + memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid)); + init_waitqueue_head(&ci->i_cap_wq); + ci->i_hold_caps_min = 0; + ci->i_hold_caps_max = 0; + INIT_LIST_HEAD(&ci->i_cap_delay_list); + INIT_LIST_HEAD(&ci->i_cap_snaps); + ci->i_head_snapc = NULL; + ci->i_snap_caps = 0; + + for (i = 0; i < CEPH_FILE_MODE_NUM; i++) + ci->i_nr_by_mode[i] = 0; + + mutex_init(&ci->i_truncate_mutex); + ci->i_truncate_seq = 0; + ci->i_truncate_size = 0; + ci->i_truncate_pending = 0; + + ci->i_max_size = 0; + ci->i_reported_size = 0; + ci->i_wanted_max_size = 0; + ci->i_requested_max_size = 0; + + ci->i_pin_ref = 0; + ci->i_rd_ref = 0; + ci->i_rdcache_ref = 0; + ci->i_wr_ref = 0; + ci->i_wb_ref = 0; + ci->i_wrbuffer_ref = 0; + ci->i_wrbuffer_ref_head = 0; + ci->i_shared_gen = 0; + ci->i_rdcache_gen = 0; + ci->i_rdcache_revoking = 0; + + INIT_LIST_HEAD(&ci->i_unsafe_writes); + INIT_LIST_HEAD(&ci->i_unsafe_dirops); + spin_lock_init(&ci->i_unsafe_lock); + + ci->i_snap_realm = NULL; + INIT_LIST_HEAD(&ci->i_snap_realm_item); + INIT_LIST_HEAD(&ci->i_snap_flush_item); + + INIT_WORK(&ci->i_wb_work, ceph_writeback_work); + INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work); + + INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work); + + ceph_fscache_inode_init(ci); + + return &ci->vfs_inode; +} + +static void ceph_i_callback(struct rcu_head *head) +{ + struct inode *inode = container_of(head, struct inode, i_rcu); + struct ceph_inode_info *ci = ceph_inode(inode); + + kmem_cache_free(ceph_inode_cachep, ci); +} + +void ceph_destroy_inode(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_inode_frag *frag; + struct rb_node *n; + + dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode)); + + ceph_fscache_unregister_inode_cookie(ci); + + ceph_queue_caps_release(inode); + + /* + * we may still have a snap_realm reference if there are stray + * caps in i_snap_caps. + */ + if (ci->i_snap_realm) { + struct ceph_mds_client *mdsc = + ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; + struct ceph_snap_realm *realm = ci->i_snap_realm; + + dout(" dropping residual ref to snap realm %p\n", realm); + spin_lock(&realm->inodes_with_caps_lock); + list_del_init(&ci->i_snap_realm_item); + spin_unlock(&realm->inodes_with_caps_lock); + ceph_put_snap_realm(mdsc, realm); + } + + kfree(ci->i_symlink); + while ((n = rb_first(&ci->i_fragtree)) != NULL) { + frag = rb_entry(n, struct ceph_inode_frag, node); + rb_erase(n, &ci->i_fragtree); + kfree(frag); + } + + __ceph_destroy_xattrs(ci); + if (ci->i_xattrs.blob) + ceph_buffer_put(ci->i_xattrs.blob); + if (ci->i_xattrs.prealloc_blob) + ceph_buffer_put(ci->i_xattrs.prealloc_blob); + + call_rcu(&inode->i_rcu, ceph_i_callback); +} + +int ceph_drop_inode(struct inode *inode) +{ + /* + * Positve dentry and corresponding inode are always accompanied + * in MDS reply. So no need to keep inode in the cache after + * dropping all its aliases. + */ + return 1; +} + +/* + * Helpers to fill in size, ctime, mtime, and atime. We have to be + * careful because either the client or MDS may have more up to date + * info, depending on which capabilities are held, and whether + * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime + * and size are monotonically increasing, except when utimes() or + * truncate() increments the corresponding _seq values.) + */ +int ceph_fill_file_size(struct inode *inode, int issued, + u32 truncate_seq, u64 truncate_size, u64 size) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int queue_trunc = 0; + + if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 || + (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) { + dout("size %lld -> %llu\n", inode->i_size, size); + inode->i_size = size; + inode->i_blocks = (size + (1<<9) - 1) >> 9; + ci->i_reported_size = size; + if (truncate_seq != ci->i_truncate_seq) { + dout("truncate_seq %u -> %u\n", + ci->i_truncate_seq, truncate_seq); + ci->i_truncate_seq = truncate_seq; + + /* the MDS should have revoked these caps */ + WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL | + CEPH_CAP_FILE_RD | + CEPH_CAP_FILE_WR | + CEPH_CAP_FILE_LAZYIO)); + /* + * If we hold relevant caps, or in the case where we're + * not the only client referencing this file and we + * don't hold those caps, then we need to check whether + * the file is either opened or mmaped + */ + if ((issued & (CEPH_CAP_FILE_CACHE| + CEPH_CAP_FILE_BUFFER)) || + mapping_mapped(inode->i_mapping) || + __ceph_caps_file_wanted(ci)) { + ci->i_truncate_pending++; + queue_trunc = 1; + } + } + } + if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 && + ci->i_truncate_size != truncate_size) { + dout("truncate_size %lld -> %llu\n", ci->i_truncate_size, + truncate_size); + ci->i_truncate_size = truncate_size; + } + + if (queue_trunc) + ceph_fscache_invalidate(inode); + + return queue_trunc; +} + +void ceph_fill_file_time(struct inode *inode, int issued, + u64 time_warp_seq, struct timespec *ctime, + struct timespec *mtime, struct timespec *atime) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int warn = 0; + + if (issued & (CEPH_CAP_FILE_EXCL| + CEPH_CAP_FILE_WR| + CEPH_CAP_FILE_BUFFER| + CEPH_CAP_AUTH_EXCL| + CEPH_CAP_XATTR_EXCL)) { + if (timespec_compare(ctime, &inode->i_ctime) > 0) { + dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n", + inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, + ctime->tv_sec, ctime->tv_nsec); + inode->i_ctime = *ctime; + } + if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) { + /* the MDS did a utimes() */ + dout("mtime %ld.%09ld -> %ld.%09ld " + "tw %d -> %d\n", + inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, + mtime->tv_sec, mtime->tv_nsec, + ci->i_time_warp_seq, (int)time_warp_seq); + + inode->i_mtime = *mtime; + inode->i_atime = *atime; + ci->i_time_warp_seq = time_warp_seq; + } else if (time_warp_seq == ci->i_time_warp_seq) { + /* nobody did utimes(); take the max */ + if (timespec_compare(mtime, &inode->i_mtime) > 0) { + dout("mtime %ld.%09ld -> %ld.%09ld inc\n", + inode->i_mtime.tv_sec, + inode->i_mtime.tv_nsec, + mtime->tv_sec, mtime->tv_nsec); + inode->i_mtime = *mtime; + } + if (timespec_compare(atime, &inode->i_atime) > 0) { + dout("atime %ld.%09ld -> %ld.%09ld inc\n", + inode->i_atime.tv_sec, + inode->i_atime.tv_nsec, + atime->tv_sec, atime->tv_nsec); + inode->i_atime = *atime; + } + } else if (issued & CEPH_CAP_FILE_EXCL) { + /* we did a utimes(); ignore mds values */ + } else { + warn = 1; + } + } else { + /* we have no write|excl caps; whatever the MDS says is true */ + if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) { + inode->i_ctime = *ctime; + inode->i_mtime = *mtime; + inode->i_atime = *atime; + ci->i_time_warp_seq = time_warp_seq; + } else { + warn = 1; + } + } + if (warn) /* time_warp_seq shouldn't go backwards */ + dout("%p mds time_warp_seq %llu < %u\n", + inode, time_warp_seq, ci->i_time_warp_seq); +} + +/* + * Populate an inode based on info from mds. May be called on new or + * existing inodes. + */ +static int fill_inode(struct inode *inode, struct page *locked_page, + struct ceph_mds_reply_info_in *iinfo, + struct ceph_mds_reply_dirfrag *dirinfo, + struct ceph_mds_session *session, + unsigned long ttl_from, int cap_fmode, + struct ceph_cap_reservation *caps_reservation) +{ + struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; + struct ceph_mds_reply_inode *info = iinfo->in; + struct ceph_inode_info *ci = ceph_inode(inode); + int issued = 0, implemented, new_issued; + struct timespec mtime, atime, ctime; + struct ceph_buffer *xattr_blob = NULL; + struct ceph_cap *new_cap = NULL; + int err = 0; + bool wake = false; + bool queue_trunc = false; + bool new_version = false; + bool fill_inline = false; + + dout("fill_inode %p ino %llx.%llx v %llu had %llu\n", + inode, ceph_vinop(inode), le64_to_cpu(info->version), + ci->i_version); + + /* prealloc new cap struct */ + if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP) + new_cap = ceph_get_cap(mdsc, caps_reservation); + + /* + * prealloc xattr data, if it looks like we'll need it. only + * if len > 4 (meaning there are actually xattrs; the first 4 + * bytes are the xattr count). + */ + if (iinfo->xattr_len > 4) { + xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS); + if (!xattr_blob) + pr_err("fill_inode ENOMEM xattr blob %d bytes\n", + iinfo->xattr_len); + } + + spin_lock(&ci->i_ceph_lock); + + /* + * provided version will be odd if inode value is projected, + * even if stable. skip the update if we have newer stable + * info (ours>=theirs, e.g. due to racing mds replies), unless + * we are getting projected (unstable) info (in which case the + * version is odd, and we want ours>theirs). + * us them + * 2 2 skip + * 3 2 skip + * 3 3 update + */ + if (ci->i_version == 0 || + ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && + le64_to_cpu(info->version) > (ci->i_version & ~1))) + new_version = true; + + issued = __ceph_caps_issued(ci, &implemented); + issued |= implemented | __ceph_caps_dirty(ci); + new_issued = ~issued & le32_to_cpu(info->cap.caps); + + /* update inode */ + ci->i_version = le64_to_cpu(info->version); + inode->i_version++; + inode->i_rdev = le32_to_cpu(info->rdev); + inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1; + + if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) && + (issued & CEPH_CAP_AUTH_EXCL) == 0) { + inode->i_mode = le32_to_cpu(info->mode); + inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid)); + inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid)); + dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, + from_kuid(&init_user_ns, inode->i_uid), + from_kgid(&init_user_ns, inode->i_gid)); + } + + if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) && + (issued & CEPH_CAP_LINK_EXCL) == 0) + set_nlink(inode, le32_to_cpu(info->nlink)); + + if (new_version || (new_issued & CEPH_CAP_ANY_RD)) { + /* be careful with mtime, atime, size */ + ceph_decode_timespec(&atime, &info->atime); + ceph_decode_timespec(&mtime, &info->mtime); + ceph_decode_timespec(&ctime, &info->ctime); + ceph_fill_file_time(inode, issued, + le32_to_cpu(info->time_warp_seq), + &ctime, &mtime, &atime); + } + + if (new_version || + (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) { + ci->i_layout = info->layout; + queue_trunc = ceph_fill_file_size(inode, issued, + le32_to_cpu(info->truncate_seq), + le64_to_cpu(info->truncate_size), + le64_to_cpu(info->size)); + /* only update max_size on auth cap */ + if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && + ci->i_max_size != le64_to_cpu(info->max_size)) { + dout("max_size %lld -> %llu\n", ci->i_max_size, + le64_to_cpu(info->max_size)); + ci->i_max_size = le64_to_cpu(info->max_size); + } + } + + /* xattrs */ + /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */ + if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) && + le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) { + if (ci->i_xattrs.blob) + ceph_buffer_put(ci->i_xattrs.blob); + ci->i_xattrs.blob = xattr_blob; + if (xattr_blob) + memcpy(ci->i_xattrs.blob->vec.iov_base, + iinfo->xattr_data, iinfo->xattr_len); + ci->i_xattrs.version = le64_to_cpu(info->xattr_version); + ceph_forget_all_cached_acls(inode); + xattr_blob = NULL; + } + + inode->i_mapping->a_ops = &ceph_aops; + + switch (inode->i_mode & S_IFMT) { + case S_IFIFO: + case S_IFBLK: + case S_IFCHR: + case S_IFSOCK: + init_special_inode(inode, inode->i_mode, inode->i_rdev); + inode->i_op = &ceph_file_iops; + break; + case S_IFREG: + inode->i_op = &ceph_file_iops; + inode->i_fop = &ceph_file_fops; + break; + case S_IFLNK: + inode->i_op = &ceph_symlink_iops; + if (!ci->i_symlink) { + u32 symlen = iinfo->symlink_len; + char *sym; + + spin_unlock(&ci->i_ceph_lock); + + err = -EINVAL; + if (WARN_ON(symlen != inode->i_size)) + goto out; + + err = -ENOMEM; + sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS); + if (!sym) + goto out; + + spin_lock(&ci->i_ceph_lock); + if (!ci->i_symlink) + ci->i_symlink = sym; + else + kfree(sym); /* lost a race */ + } + break; + case S_IFDIR: + inode->i_op = &ceph_dir_iops; + inode->i_fop = &ceph_dir_fops; + + ci->i_dir_layout = iinfo->dir_layout; + + ci->i_files = le64_to_cpu(info->files); + ci->i_subdirs = le64_to_cpu(info->subdirs); + ci->i_rbytes = le64_to_cpu(info->rbytes); + ci->i_rfiles = le64_to_cpu(info->rfiles); + ci->i_rsubdirs = le64_to_cpu(info->rsubdirs); + ceph_decode_timespec(&ci->i_rctime, &info->rctime); + break; + default: + pr_err("fill_inode %llx.%llx BAD mode 0%o\n", + ceph_vinop(inode), inode->i_mode); + } + + /* were we issued a capability? */ + if (info->cap.caps) { + if (ceph_snap(inode) == CEPH_NOSNAP) { + unsigned caps = le32_to_cpu(info->cap.caps); + ceph_add_cap(inode, session, + le64_to_cpu(info->cap.cap_id), + cap_fmode, caps, + le32_to_cpu(info->cap.wanted), + le32_to_cpu(info->cap.seq), + le32_to_cpu(info->cap.mseq), + le64_to_cpu(info->cap.realm), + info->cap.flags, &new_cap); + + /* set dir completion flag? */ + if (S_ISDIR(inode->i_mode) && + ci->i_files == 0 && ci->i_subdirs == 0 && + (caps & CEPH_CAP_FILE_SHARED) && + (issued & CEPH_CAP_FILE_EXCL) == 0 && + !__ceph_dir_is_complete(ci)) { + dout(" marking %p complete (empty)\n", inode); + __ceph_dir_set_complete(ci, + atomic_read(&ci->i_release_count), + ci->i_ordered_count); + } + + wake = true; + } else { + dout(" %p got snap_caps %s\n", inode, + ceph_cap_string(le32_to_cpu(info->cap.caps))); + ci->i_snap_caps |= le32_to_cpu(info->cap.caps); + if (cap_fmode >= 0) + __ceph_get_fmode(ci, cap_fmode); + } + } else if (cap_fmode >= 0) { + pr_warn("mds issued no caps on %llx.%llx\n", + ceph_vinop(inode)); + __ceph_get_fmode(ci, cap_fmode); + } + + if (iinfo->inline_version > 0 && + iinfo->inline_version >= ci->i_inline_version) { + int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; + ci->i_inline_version = iinfo->inline_version; + if (ci->i_inline_version != CEPH_INLINE_NONE && + (locked_page || + (le32_to_cpu(info->cap.caps) & cache_caps))) + fill_inline = true; + } + + spin_unlock(&ci->i_ceph_lock); + + if (fill_inline) + ceph_fill_inline_data(inode, locked_page, + iinfo->inline_data, iinfo->inline_len); + + if (wake) + wake_up_all(&ci->i_cap_wq); + + /* queue truncate if we saw i_size decrease */ + if (queue_trunc) + ceph_queue_vmtruncate(inode); + + /* populate frag tree */ + if (S_ISDIR(inode->i_mode)) + ceph_fill_fragtree(inode, &info->fragtree, dirinfo); + + /* update delegation info? */ + if (dirinfo) + ceph_fill_dirfrag(inode, dirinfo); + + err = 0; +out: + if (new_cap) + ceph_put_cap(mdsc, new_cap); + if (xattr_blob) + ceph_buffer_put(xattr_blob); + return err; +} + +/* + * caller should hold session s_mutex. + */ +static void update_dentry_lease(struct dentry *dentry, + struct ceph_mds_reply_lease *lease, + struct ceph_mds_session *session, + unsigned long from_time) +{ + struct ceph_dentry_info *di = ceph_dentry(dentry); + long unsigned duration = le32_to_cpu(lease->duration_ms); + long unsigned ttl = from_time + (duration * HZ) / 1000; + long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; + struct inode *dir; + + /* only track leases on regular dentries */ + if (dentry->d_op != &ceph_dentry_ops) + return; + + spin_lock(&dentry->d_lock); + dout("update_dentry_lease %p duration %lu ms ttl %lu\n", + dentry, duration, ttl); + + /* make lease_rdcache_gen match directory */ + dir = d_inode(dentry->d_parent); + di->lease_shared_gen = ceph_inode(dir)->i_shared_gen; + + if (duration == 0) + goto out_unlock; + + if (di->lease_gen == session->s_cap_gen && + time_before(ttl, dentry->d_time)) + goto out_unlock; /* we already have a newer lease. */ + + if (di->lease_session && di->lease_session != session) + goto out_unlock; + + ceph_dentry_lru_touch(dentry); + + if (!di->lease_session) + di->lease_session = ceph_get_mds_session(session); + di->lease_gen = session->s_cap_gen; + di->lease_seq = le32_to_cpu(lease->seq); + di->lease_renew_after = half_ttl; + di->lease_renew_from = 0; + dentry->d_time = ttl; +out_unlock: + spin_unlock(&dentry->d_lock); + return; +} + +/* + * splice a dentry to an inode. + * caller must hold directory i_mutex for this to be safe. + * + * we will only rehash the resulting dentry if @prehash is + * true; @prehash will be set to false (for the benefit of + * the caller) if we fail. + */ +static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, + bool *prehash) +{ + struct dentry *realdn; + + BUG_ON(d_inode(dn)); + + /* dn must be unhashed */ + if (!d_unhashed(dn)) + d_drop(dn); + realdn = d_splice_alias(in, dn); + if (IS_ERR(realdn)) { + pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n", + PTR_ERR(realdn), dn, in, ceph_vinop(in)); + if (prehash) + *prehash = false; /* don't rehash on error */ + dn = realdn; /* note realdn contains the error */ + goto out; + } else if (realdn) { + dout("dn %p (%d) spliced with %p (%d) " + "inode %p ino %llx.%llx\n", + dn, d_count(dn), + realdn, d_count(realdn), + d_inode(realdn), ceph_vinop(d_inode(realdn))); + dput(dn); + dn = realdn; + } else { + BUG_ON(!ceph_dentry(dn)); + dout("dn %p attached to %p ino %llx.%llx\n", + dn, d_inode(dn), ceph_vinop(d_inode(dn))); + } + if ((!prehash || *prehash) && d_unhashed(dn)) + d_rehash(dn); +out: + return dn; +} + +/* + * Incorporate results into the local cache. This is either just + * one inode, or a directory, dentry, and possibly linked-to inode (e.g., + * after a lookup). + * + * A reply may contain + * a directory inode along with a dentry. + * and/or a target inode + * + * Called with snap_rwsem (read). + */ +int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, + struct ceph_mds_session *session) +{ + struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; + struct inode *in = NULL; + struct ceph_vino vino; + struct ceph_fs_client *fsc = ceph_sb_to_client(sb); + int err = 0; + + dout("fill_trace %p is_dentry %d is_target %d\n", req, + rinfo->head->is_dentry, rinfo->head->is_target); + +#if 0 + /* + * Debugging hook: + * + * If we resend completed ops to a recovering mds, we get no + * trace. Since that is very rare, pretend this is the case + * to ensure the 'no trace' handlers in the callers behave. + * + * Fill in inodes unconditionally to avoid breaking cap + * invariants. + */ + if (rinfo->head->op & CEPH_MDS_OP_WRITE) { + pr_info("fill_trace faking empty trace on %lld %s\n", + req->r_tid, ceph_mds_op_name(rinfo->head->op)); + if (rinfo->head->is_dentry) { + rinfo->head->is_dentry = 0; + err = fill_inode(req->r_locked_dir, + &rinfo->diri, rinfo->dirfrag, + session, req->r_request_started, -1); + } + if (rinfo->head->is_target) { + rinfo->head->is_target = 0; + ininfo = rinfo->targeti.in; + vino.ino = le64_to_cpu(ininfo->ino); + vino.snap = le64_to_cpu(ininfo->snapid); + in = ceph_get_inode(sb, vino); + err = fill_inode(in, &rinfo->targeti, NULL, + session, req->r_request_started, + req->r_fmode); + iput(in); + } + } +#endif + + if (!rinfo->head->is_target && !rinfo->head->is_dentry) { + dout("fill_trace reply is empty!\n"); + if (rinfo->head->result == 0 && req->r_locked_dir) + ceph_invalidate_dir_request(req); + return 0; + } + + if (rinfo->head->is_dentry) { + struct inode *dir = req->r_locked_dir; + + if (dir) { + err = fill_inode(dir, NULL, + &rinfo->diri, rinfo->dirfrag, + session, req->r_request_started, -1, + &req->r_caps_reservation); + if (err < 0) + goto done; + } else { + WARN_ON_ONCE(1); + } + + if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) { + struct qstr dname; + struct dentry *dn, *parent; + + BUG_ON(!rinfo->head->is_target); + BUG_ON(req->r_dentry); + + parent = d_find_any_alias(dir); + BUG_ON(!parent); + + dname.name = rinfo->dname; + dname.len = rinfo->dname_len; + dname.hash = full_name_hash(dname.name, dname.len); + vino.ino = le64_to_cpu(rinfo->targeti.in->ino); + vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); +retry_lookup: + dn = d_lookup(parent, &dname); + dout("d_lookup on parent=%p name=%.*s got %p\n", + parent, dname.len, dname.name, dn); + + if (!dn) { + dn = d_alloc(parent, &dname); + dout("d_alloc %p '%.*s' = %p\n", parent, + dname.len, dname.name, dn); + if (dn == NULL) { + dput(parent); + err = -ENOMEM; + goto done; + } + err = ceph_init_dentry(dn); + if (err < 0) { + dput(dn); + dput(parent); + goto done; + } + } else if (d_really_is_positive(dn) && + (ceph_ino(d_inode(dn)) != vino.ino || + ceph_snap(d_inode(dn)) != vino.snap)) { + dout(" dn %p points to wrong inode %p\n", + dn, d_inode(dn)); + d_delete(dn); + dput(dn); + goto retry_lookup; + } + + req->r_dentry = dn; + dput(parent); + } + } + + if (rinfo->head->is_target) { + vino.ino = le64_to_cpu(rinfo->targeti.in->ino); + vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); + + in = ceph_get_inode(sb, vino); + if (IS_ERR(in)) { + err = PTR_ERR(in); + goto done; + } + req->r_target_inode = in; + + err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL, + session, req->r_request_started, + (!req->r_aborted && rinfo->head->result == 0) ? + req->r_fmode : -1, + &req->r_caps_reservation); + if (err < 0) { + pr_err("fill_inode badness %p %llx.%llx\n", + in, ceph_vinop(in)); + goto done; + } + } + + /* + * ignore null lease/binding on snapdir ENOENT, or else we + * will have trouble splicing in the virtual snapdir later + */ + if (rinfo->head->is_dentry && !req->r_aborted && + req->r_locked_dir && + (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name, + fsc->mount_options->snapdir_name, + req->r_dentry->d_name.len))) { + /* + * lookup link rename : null -> possibly existing inode + * mknod symlink mkdir : null -> new inode + * unlink : linked -> null + */ + struct inode *dir = req->r_locked_dir; + struct dentry *dn = req->r_dentry; + bool have_dir_cap, have_lease; + + BUG_ON(!dn); + BUG_ON(!dir); + BUG_ON(d_inode(dn->d_parent) != dir); + BUG_ON(ceph_ino(dir) != + le64_to_cpu(rinfo->diri.in->ino)); + BUG_ON(ceph_snap(dir) != + le64_to_cpu(rinfo->diri.in->snapid)); + + /* do we have a lease on the whole dir? */ + have_dir_cap = + (le32_to_cpu(rinfo->diri.in->cap.caps) & + CEPH_CAP_FILE_SHARED); + + /* do we have a dn lease? */ + have_lease = have_dir_cap || + le32_to_cpu(rinfo->dlease->duration_ms); + if (!have_lease) + dout("fill_trace no dentry lease or dir cap\n"); + + /* rename? */ + if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { + struct inode *olddir = req->r_old_dentry_dir; + BUG_ON(!olddir); + + dout(" src %p '%pd' dst %p '%pd'\n", + req->r_old_dentry, + req->r_old_dentry, + dn, dn); + dout("fill_trace doing d_move %p -> %p\n", + req->r_old_dentry, dn); + + d_move(req->r_old_dentry, dn); + dout(" src %p '%pd' dst %p '%pd'\n", + req->r_old_dentry, + req->r_old_dentry, + dn, dn); + + /* ensure target dentry is invalidated, despite + rehashing bug in vfs_rename_dir */ + ceph_invalidate_dentry_lease(dn); + + /* d_move screws up sibling dentries' offsets */ + ceph_dir_clear_ordered(dir); + ceph_dir_clear_ordered(olddir); + + dout("dn %p gets new offset %lld\n", req->r_old_dentry, + ceph_dentry(req->r_old_dentry)->offset); + + dn = req->r_old_dentry; /* use old_dentry */ + } + + /* null dentry? */ + if (!rinfo->head->is_target) { + dout("fill_trace null dentry\n"); + if (d_really_is_positive(dn)) { + ceph_dir_clear_ordered(dir); + dout("d_delete %p\n", dn); + d_delete(dn); + } else { + dout("d_instantiate %p NULL\n", dn); + d_instantiate(dn, NULL); + if (have_lease && d_unhashed(dn)) + d_rehash(dn); + update_dentry_lease(dn, rinfo->dlease, + session, + req->r_request_started); + } + goto done; + } + + /* attach proper inode */ + if (d_really_is_negative(dn)) { + ceph_dir_clear_ordered(dir); + ihold(in); + dn = splice_dentry(dn, in, &have_lease); + if (IS_ERR(dn)) { + err = PTR_ERR(dn); + goto done; + } + req->r_dentry = dn; /* may have spliced */ + } else if (d_really_is_positive(dn) && d_inode(dn) != in) { + dout(" %p links to %p %llx.%llx, not %llx.%llx\n", + dn, d_inode(dn), ceph_vinop(d_inode(dn)), + ceph_vinop(in)); + have_lease = false; + } + + if (have_lease) + update_dentry_lease(dn, rinfo->dlease, session, + req->r_request_started); + dout(" final dn %p\n", dn); + } else if (!req->r_aborted && + (req->r_op == CEPH_MDS_OP_LOOKUPSNAP || + req->r_op == CEPH_MDS_OP_MKSNAP)) { + struct dentry *dn = req->r_dentry; + struct inode *dir = req->r_locked_dir; + + /* fill out a snapdir LOOKUPSNAP dentry */ + BUG_ON(!dn); + BUG_ON(!dir); + BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR); + dout(" linking snapped dir %p to dn %p\n", in, dn); + ceph_dir_clear_ordered(dir); + ihold(in); + dn = splice_dentry(dn, in, NULL); + if (IS_ERR(dn)) { + err = PTR_ERR(dn); + goto done; + } + req->r_dentry = dn; /* may have spliced */ + } +done: + dout("fill_trace done err=%d\n", err); + return err; +} + +/* + * Prepopulate our cache with readdir results, leases, etc. + */ +static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req, + struct ceph_mds_session *session) +{ + struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; + int i, err = 0; + + for (i = 0; i < rinfo->dir_nr; i++) { + struct ceph_vino vino; + struct inode *in; + int rc; + + vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); + vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); + + in = ceph_get_inode(req->r_dentry->d_sb, vino); + if (IS_ERR(in)) { + err = PTR_ERR(in); + dout("new_inode badness got %d\n", err); + continue; + } + rc = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session, + req->r_request_started, -1, + &req->r_caps_reservation); + if (rc < 0) { + pr_err("fill_inode badness on %p got %d\n", in, rc); + err = rc; + continue; + } + } + + return err; +} + +int ceph_readdir_prepopulate(struct ceph_mds_request *req, + struct ceph_mds_session *session) +{ + struct dentry *parent = req->r_dentry; + struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; + struct qstr dname; + struct dentry *dn; + struct inode *in; + int err = 0, ret, i; + struct inode *snapdir = NULL; + struct ceph_mds_request_head *rhead = req->r_request->front.iov_base; + struct ceph_dentry_info *di; + u64 r_readdir_offset = req->r_readdir_offset; + u32 frag = le32_to_cpu(rhead->args.readdir.frag); + + if (rinfo->dir_dir && + le32_to_cpu(rinfo->dir_dir->frag) != frag) { + dout("readdir_prepopulate got new frag %x -> %x\n", + frag, le32_to_cpu(rinfo->dir_dir->frag)); + frag = le32_to_cpu(rinfo->dir_dir->frag); + if (ceph_frag_is_leftmost(frag)) + r_readdir_offset = 2; + else + r_readdir_offset = 0; + } + + if (req->r_aborted) + return readdir_prepopulate_inodes_only(req, session); + + if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { + snapdir = ceph_get_snapdir(d_inode(parent)); + parent = d_find_alias(snapdir); + dout("readdir_prepopulate %d items under SNAPDIR dn %p\n", + rinfo->dir_nr, parent); + } else { + dout("readdir_prepopulate %d items under dn %p\n", + rinfo->dir_nr, parent); + if (rinfo->dir_dir) + ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir); + } + + /* FIXME: release caps/leases if error occurs */ + for (i = 0; i < rinfo->dir_nr; i++) { + struct ceph_vino vino; + + dname.name = rinfo->dir_dname[i]; + dname.len = rinfo->dir_dname_len[i]; + dname.hash = full_name_hash(dname.name, dname.len); + + vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); + vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); + +retry_lookup: + dn = d_lookup(parent, &dname); + dout("d_lookup on parent=%p name=%.*s got %p\n", + parent, dname.len, dname.name, dn); + + if (!dn) { + dn = d_alloc(parent, &dname); + dout("d_alloc %p '%.*s' = %p\n", parent, + dname.len, dname.name, dn); + if (dn == NULL) { + dout("d_alloc badness\n"); + err = -ENOMEM; + goto out; + } + ret = ceph_init_dentry(dn); + if (ret < 0) { + dput(dn); + err = ret; + goto out; + } + } else if (d_really_is_positive(dn) && + (ceph_ino(d_inode(dn)) != vino.ino || + ceph_snap(d_inode(dn)) != vino.snap)) { + dout(" dn %p points to wrong inode %p\n", + dn, d_inode(dn)); + d_delete(dn); + dput(dn); + goto retry_lookup; + } else { + /* reorder parent's d_subdirs */ + spin_lock(&parent->d_lock); + spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED); + list_move(&dn->d_child, &parent->d_subdirs); + spin_unlock(&dn->d_lock); + spin_unlock(&parent->d_lock); + } + + /* inode */ + if (d_really_is_positive(dn)) { + in = d_inode(dn); + } else { + in = ceph_get_inode(parent->d_sb, vino); + if (IS_ERR(in)) { + dout("new_inode badness\n"); + d_drop(dn); + dput(dn); + err = PTR_ERR(in); + goto out; + } + } + + if (fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session, + req->r_request_started, -1, + &req->r_caps_reservation) < 0) { + pr_err("fill_inode badness on %p\n", in); + if (d_really_is_negative(dn)) + iput(in); + d_drop(dn); + goto next_item; + } + + if (d_really_is_negative(dn)) { + struct dentry *realdn = splice_dentry(dn, in, NULL); + if (IS_ERR(realdn)) { + err = PTR_ERR(realdn); + d_drop(dn); + dn = NULL; + goto next_item; + } + dn = realdn; + } + + di = dn->d_fsdata; + di->offset = ceph_make_fpos(frag, i + r_readdir_offset); + + update_dentry_lease(dn, rinfo->dir_dlease[i], + req->r_session, + req->r_request_started); +next_item: + if (dn) + dput(dn); + } + if (err == 0) + req->r_did_prepopulate = true; + +out: + if (snapdir) { + iput(snapdir); + dput(parent); + } + dout("readdir_prepopulate done\n"); + return err; +} + +int ceph_inode_set_size(struct inode *inode, loff_t size) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int ret = 0; + + spin_lock(&ci->i_ceph_lock); + dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size); + inode->i_size = size; + inode->i_blocks = (size + (1 << 9) - 1) >> 9; + + /* tell the MDS if we are approaching max_size */ + if ((size << 1) >= ci->i_max_size && + (ci->i_reported_size << 1) < ci->i_max_size) + ret = 1; + + spin_unlock(&ci->i_ceph_lock); + return ret; +} + +/* + * Write back inode data in a worker thread. (This can't be done + * in the message handler context.) + */ +void ceph_queue_writeback(struct inode *inode) +{ + ihold(inode); + if (queue_work(ceph_inode_to_client(inode)->wb_wq, + &ceph_inode(inode)->i_wb_work)) { + dout("ceph_queue_writeback %p\n", inode); + } else { + dout("ceph_queue_writeback %p failed\n", inode); + iput(inode); + } +} + +static void ceph_writeback_work(struct work_struct *work) +{ + struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, + i_wb_work); + struct inode *inode = &ci->vfs_inode; + + dout("writeback %p\n", inode); + filemap_fdatawrite(&inode->i_data); + iput(inode); +} + +/* + * queue an async invalidation + */ +void ceph_queue_invalidate(struct inode *inode) +{ + ihold(inode); + if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq, + &ceph_inode(inode)->i_pg_inv_work)) { + dout("ceph_queue_invalidate %p\n", inode); + } else { + dout("ceph_queue_invalidate %p failed\n", inode); + iput(inode); + } +} + +/* + * Invalidate inode pages in a worker thread. (This can't be done + * in the message handler context.) + */ +static void ceph_invalidate_work(struct work_struct *work) +{ + struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, + i_pg_inv_work); + struct inode *inode = &ci->vfs_inode; + u32 orig_gen; + int check = 0; + + mutex_lock(&ci->i_truncate_mutex); + spin_lock(&ci->i_ceph_lock); + dout("invalidate_pages %p gen %d revoking %d\n", inode, + ci->i_rdcache_gen, ci->i_rdcache_revoking); + if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { + if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) + check = 1; + spin_unlock(&ci->i_ceph_lock); + mutex_unlock(&ci->i_truncate_mutex); + goto out; + } + orig_gen = ci->i_rdcache_gen; + spin_unlock(&ci->i_ceph_lock); + + truncate_pagecache(inode, 0); + + spin_lock(&ci->i_ceph_lock); + if (orig_gen == ci->i_rdcache_gen && + orig_gen == ci->i_rdcache_revoking) { + dout("invalidate_pages %p gen %d successful\n", inode, + ci->i_rdcache_gen); + ci->i_rdcache_revoking--; + check = 1; + } else { + dout("invalidate_pages %p gen %d raced, now %d revoking %d\n", + inode, orig_gen, ci->i_rdcache_gen, + ci->i_rdcache_revoking); + if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) + check = 1; + } + spin_unlock(&ci->i_ceph_lock); + mutex_unlock(&ci->i_truncate_mutex); +out: + if (check) + ceph_check_caps(ci, 0, NULL); + iput(inode); +} + + +/* + * called by trunc_wq; + * + * We also truncate in a separate thread as well. + */ +static void ceph_vmtruncate_work(struct work_struct *work) +{ + struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, + i_vmtruncate_work); + struct inode *inode = &ci->vfs_inode; + + dout("vmtruncate_work %p\n", inode); + __ceph_do_pending_vmtruncate(inode); + iput(inode); +} + +/* + * Queue an async vmtruncate. If we fail to queue work, we will handle + * the truncation the next time we call __ceph_do_pending_vmtruncate. + */ +void ceph_queue_vmtruncate(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + + ihold(inode); + + if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq, + &ci->i_vmtruncate_work)) { + dout("ceph_queue_vmtruncate %p\n", inode); + } else { + dout("ceph_queue_vmtruncate %p failed, pending=%d\n", + inode, ci->i_truncate_pending); + iput(inode); + } +} + +/* + * Make sure any pending truncation is applied before doing anything + * that may depend on it. + */ +void __ceph_do_pending_vmtruncate(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + u64 to; + int wrbuffer_refs, finish = 0; + + mutex_lock(&ci->i_truncate_mutex); +retry: + spin_lock(&ci->i_ceph_lock); + if (ci->i_truncate_pending == 0) { + dout("__do_pending_vmtruncate %p none pending\n", inode); + spin_unlock(&ci->i_ceph_lock); + mutex_unlock(&ci->i_truncate_mutex); + return; + } + + /* + * make sure any dirty snapped pages are flushed before we + * possibly truncate them.. so write AND block! + */ + if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { + dout("__do_pending_vmtruncate %p flushing snaps first\n", + inode); + spin_unlock(&ci->i_ceph_lock); + filemap_write_and_wait_range(&inode->i_data, 0, + inode->i_sb->s_maxbytes); + goto retry; + } + + /* there should be no reader or writer */ + WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref); + + to = ci->i_truncate_size; + wrbuffer_refs = ci->i_wrbuffer_ref; + dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode, + ci->i_truncate_pending, to); + spin_unlock(&ci->i_ceph_lock); + + truncate_pagecache(inode, to); + + spin_lock(&ci->i_ceph_lock); + if (to == ci->i_truncate_size) { + ci->i_truncate_pending = 0; + finish = 1; + } + spin_unlock(&ci->i_ceph_lock); + if (!finish) + goto retry; + + mutex_unlock(&ci->i_truncate_mutex); + + if (wrbuffer_refs == 0) + ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); + + wake_up_all(&ci->i_cap_wq); +} + +/* + * symlinks + */ +static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + struct ceph_inode_info *ci = ceph_inode(d_inode(dentry)); + nd_set_link(nd, ci->i_symlink); + return NULL; +} + +static const struct inode_operations ceph_symlink_iops = { + .readlink = generic_readlink, + .follow_link = ceph_sym_follow_link, + .setattr = ceph_setattr, + .getattr = ceph_getattr, + .setxattr = ceph_setxattr, + .getxattr = ceph_getxattr, + .listxattr = ceph_listxattr, + .removexattr = ceph_removexattr, +}; + +/* + * setattr + */ +int ceph_setattr(struct dentry *dentry, struct iattr *attr) +{ + struct inode *inode = d_inode(dentry); + struct ceph_inode_info *ci = ceph_inode(inode); + const unsigned int ia_valid = attr->ia_valid; + struct ceph_mds_request *req; + struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc; + int issued; + int release = 0, dirtied = 0; + int mask = 0; + int err = 0; + int inode_dirty_flags = 0; + + if (ceph_snap(inode) != CEPH_NOSNAP) + return -EROFS; + + err = inode_change_ok(inode, attr); + if (err != 0) + return err; + + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, + USE_AUTH_MDS); + if (IS_ERR(req)) + return PTR_ERR(req); + + spin_lock(&ci->i_ceph_lock); + issued = __ceph_caps_issued(ci, NULL); + dout("setattr %p issued %s\n", inode, ceph_cap_string(issued)); + + if (ia_valid & ATTR_UID) { + dout("setattr %p uid %d -> %d\n", inode, + from_kuid(&init_user_ns, inode->i_uid), + from_kuid(&init_user_ns, attr->ia_uid)); + if (issued & CEPH_CAP_AUTH_EXCL) { + inode->i_uid = attr->ia_uid; + dirtied |= CEPH_CAP_AUTH_EXCL; + } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || + !uid_eq(attr->ia_uid, inode->i_uid)) { + req->r_args.setattr.uid = cpu_to_le32( + from_kuid(&init_user_ns, attr->ia_uid)); + mask |= CEPH_SETATTR_UID; + release |= CEPH_CAP_AUTH_SHARED; + } + } + if (ia_valid & ATTR_GID) { + dout("setattr %p gid %d -> %d\n", inode, + from_kgid(&init_user_ns, inode->i_gid), + from_kgid(&init_user_ns, attr->ia_gid)); + if (issued & CEPH_CAP_AUTH_EXCL) { + inode->i_gid = attr->ia_gid; + dirtied |= CEPH_CAP_AUTH_EXCL; + } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || + !gid_eq(attr->ia_gid, inode->i_gid)) { + req->r_args.setattr.gid = cpu_to_le32( + from_kgid(&init_user_ns, attr->ia_gid)); + mask |= CEPH_SETATTR_GID; + release |= CEPH_CAP_AUTH_SHARED; + } + } + if (ia_valid & ATTR_MODE) { + dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode, + attr->ia_mode); + if (issued & CEPH_CAP_AUTH_EXCL) { + inode->i_mode = attr->ia_mode; + dirtied |= CEPH_CAP_AUTH_EXCL; + } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || + attr->ia_mode != inode->i_mode) { + inode->i_mode = attr->ia_mode; + req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); + mask |= CEPH_SETATTR_MODE; + release |= CEPH_CAP_AUTH_SHARED; + } + } + + if (ia_valid & ATTR_ATIME) { + dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode, + inode->i_atime.tv_sec, inode->i_atime.tv_nsec, + attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); + if (issued & CEPH_CAP_FILE_EXCL) { + ci->i_time_warp_seq++; + inode->i_atime = attr->ia_atime; + dirtied |= CEPH_CAP_FILE_EXCL; + } else if ((issued & CEPH_CAP_FILE_WR) && + timespec_compare(&inode->i_atime, + &attr->ia_atime) < 0) { + inode->i_atime = attr->ia_atime; + dirtied |= CEPH_CAP_FILE_WR; + } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || + !timespec_equal(&inode->i_atime, &attr->ia_atime)) { + ceph_encode_timespec(&req->r_args.setattr.atime, + &attr->ia_atime); + mask |= CEPH_SETATTR_ATIME; + release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD | + CEPH_CAP_FILE_WR; + } + } + if (ia_valid & ATTR_MTIME) { + dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode, + inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, + attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); + if (issued & CEPH_CAP_FILE_EXCL) { + ci->i_time_warp_seq++; + inode->i_mtime = attr->ia_mtime; + dirtied |= CEPH_CAP_FILE_EXCL; + } else if ((issued & CEPH_CAP_FILE_WR) && + timespec_compare(&inode->i_mtime, + &attr->ia_mtime) < 0) { + inode->i_mtime = attr->ia_mtime; + dirtied |= CEPH_CAP_FILE_WR; + } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || + !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) { + ceph_encode_timespec(&req->r_args.setattr.mtime, + &attr->ia_mtime); + mask |= CEPH_SETATTR_MTIME; + release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | + CEPH_CAP_FILE_WR; + } + } + if (ia_valid & ATTR_SIZE) { + dout("setattr %p size %lld -> %lld\n", inode, + inode->i_size, attr->ia_size); + if ((issued & CEPH_CAP_FILE_EXCL) && + attr->ia_size > inode->i_size) { + inode->i_size = attr->ia_size; + inode->i_blocks = + (attr->ia_size + (1 << 9) - 1) >> 9; + inode->i_ctime = attr->ia_ctime; + ci->i_reported_size = attr->ia_size; + dirtied |= CEPH_CAP_FILE_EXCL; + } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || + attr->ia_size != inode->i_size) { + req->r_args.setattr.size = cpu_to_le64(attr->ia_size); + req->r_args.setattr.old_size = + cpu_to_le64(inode->i_size); + mask |= CEPH_SETATTR_SIZE; + release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | + CEPH_CAP_FILE_WR; + } + } + + /* these do nothing */ + if (ia_valid & ATTR_CTIME) { + bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| + ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; + dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode, + inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, + attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, + only ? "ctime only" : "ignored"); + inode->i_ctime = attr->ia_ctime; + if (only) { + /* + * if kernel wants to dirty ctime but nothing else, + * we need to choose a cap to dirty under, or do + * a almost-no-op setattr + */ + if (issued & CEPH_CAP_AUTH_EXCL) + dirtied |= CEPH_CAP_AUTH_EXCL; + else if (issued & CEPH_CAP_FILE_EXCL) + dirtied |= CEPH_CAP_FILE_EXCL; + else if (issued & CEPH_CAP_XATTR_EXCL) + dirtied |= CEPH_CAP_XATTR_EXCL; + else + mask |= CEPH_SETATTR_CTIME; + } + } + if (ia_valid & ATTR_FILE) + dout("setattr %p ATTR_FILE ... hrm!\n", inode); + + if (dirtied) { + inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied); + inode->i_ctime = CURRENT_TIME; + } + + release &= issued; + spin_unlock(&ci->i_ceph_lock); + + if (inode_dirty_flags) + __mark_inode_dirty(inode, inode_dirty_flags); + + if (ia_valid & ATTR_MODE) { + err = posix_acl_chmod(inode, attr->ia_mode); + if (err) + goto out_put; + } + + if (mask) { + req->r_inode = inode; + ihold(inode); + req->r_inode_drop = release; + req->r_args.setattr.mask = cpu_to_le32(mask); + req->r_num_caps = 1; + err = ceph_mdsc_do_request(mdsc, NULL, req); + } + dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err, + ceph_cap_string(dirtied), mask); + + ceph_mdsc_put_request(req); + if (mask & CEPH_SETATTR_SIZE) + __ceph_do_pending_vmtruncate(inode); + return err; +out_put: + ceph_mdsc_put_request(req); + return err; +} + +/* + * Verify that we have a lease on the given mask. If not, + * do a getattr against an mds. + */ +int __ceph_do_getattr(struct inode *inode, struct page *locked_page, + int mask, bool force) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + int err; + + if (ceph_snap(inode) == CEPH_SNAPDIR) { + dout("do_getattr inode %p SNAPDIR\n", inode); + return 0; + } + + dout("do_getattr inode %p mask %s mode 0%o\n", + inode, ceph_cap_string(mask), inode->i_mode); + if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1)) + return 0; + + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); + if (IS_ERR(req)) + return PTR_ERR(req); + req->r_inode = inode; + ihold(inode); + req->r_num_caps = 1; + req->r_args.getattr.mask = cpu_to_le32(mask); + req->r_locked_page = locked_page; + err = ceph_mdsc_do_request(mdsc, NULL, req); + if (locked_page && err == 0) { + u64 inline_version = req->r_reply_info.targeti.inline_version; + if (inline_version == 0) { + /* the reply is supposed to contain inline data */ + err = -EINVAL; + } else if (inline_version == CEPH_INLINE_NONE) { + err = -ENODATA; + } else { + err = req->r_reply_info.targeti.inline_len; + } + } + ceph_mdsc_put_request(req); + dout("do_getattr result=%d\n", err); + return err; +} + + +/* + * Check inode permissions. We verify we have a valid value for + * the AUTH cap, then call the generic handler. + */ +int ceph_permission(struct inode *inode, int mask) +{ + int err; + + if (mask & MAY_NOT_BLOCK) + return -ECHILD; + + err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false); + + if (!err) + err = generic_permission(inode, mask); + return err; +} + +/* + * Get all attributes. Hopefully somedata we'll have a statlite() + * and can limit the fields we require to be accurate. + */ +int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat) +{ + struct inode *inode = d_inode(dentry); + struct ceph_inode_info *ci = ceph_inode(inode); + int err; + + err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false); + if (!err) { + generic_fillattr(inode, stat); + stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino); + if (ceph_snap(inode) != CEPH_NOSNAP) + stat->dev = ceph_snap(inode); + else + stat->dev = 0; + if (S_ISDIR(inode->i_mode)) { + if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), + RBYTES)) + stat->size = ci->i_rbytes; + else + stat->size = ci->i_files + ci->i_subdirs; + stat->blocks = 0; + stat->blksize = 65536; + } + } + return err; +} diff --git a/kernel/fs/ceph/ioctl.c b/kernel/fs/ceph/ioctl.c new file mode 100644 index 000000000..f851d8d70 --- /dev/null +++ b/kernel/fs/ceph/ioctl.c @@ -0,0 +1,295 @@ +#include +#include + +#include "super.h" +#include "mds_client.h" +#include "ioctl.h" + + +/* + * ioctls + */ + +/* + * get and set the file layout + */ +static long ceph_ioctl_get_layout(struct file *file, void __user *arg) +{ + struct ceph_inode_info *ci = ceph_inode(file_inode(file)); + struct ceph_ioctl_layout l; + int err; + + err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT, false); + if (!err) { + l.stripe_unit = ceph_file_layout_su(ci->i_layout); + l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout); + l.object_size = ceph_file_layout_object_size(ci->i_layout); + l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool); + l.preferred_osd = (s32)-1; + if (copy_to_user(arg, &l, sizeof(l))) + return -EFAULT; + } + + return err; +} + +static long __validate_layout(struct ceph_mds_client *mdsc, + struct ceph_ioctl_layout *l) +{ + int i, err; + + /* validate striping parameters */ + if ((l->object_size & ~PAGE_MASK) || + (l->stripe_unit & ~PAGE_MASK) || + ((unsigned)l->stripe_unit != 0 && + ((unsigned)l->object_size % (unsigned)l->stripe_unit))) + return -EINVAL; + + /* make sure it's a valid data pool */ + mutex_lock(&mdsc->mutex); + err = -EINVAL; + for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++) + if (mdsc->mdsmap->m_data_pg_pools[i] == l->data_pool) { + err = 0; + break; + } + mutex_unlock(&mdsc->mutex); + if (err) + return err; + + return 0; +} + +static long ceph_ioctl_set_layout(struct file *file, void __user *arg) +{ + struct inode *inode = file_inode(file); + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; + struct ceph_mds_request *req; + struct ceph_ioctl_layout l; + struct ceph_inode_info *ci = ceph_inode(file_inode(file)); + struct ceph_ioctl_layout nl; + int err; + + if (copy_from_user(&l, arg, sizeof(l))) + return -EFAULT; + + /* validate changed params against current layout */ + err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT, false); + if (err) + return err; + + memset(&nl, 0, sizeof(nl)); + if (l.stripe_count) + nl.stripe_count = l.stripe_count; + else + nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout); + if (l.stripe_unit) + nl.stripe_unit = l.stripe_unit; + else + nl.stripe_unit = ceph_file_layout_su(ci->i_layout); + if (l.object_size) + nl.object_size = l.object_size; + else + nl.object_size = ceph_file_layout_object_size(ci->i_layout); + if (l.data_pool) + nl.data_pool = l.data_pool; + else + nl.data_pool = ceph_file_layout_pg_pool(ci->i_layout); + + /* this is obsolete, and always -1 */ + nl.preferred_osd = le64_to_cpu(-1); + + err = __validate_layout(mdsc, &nl); + if (err) + return err; + + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT, + USE_AUTH_MDS); + if (IS_ERR(req)) + return PTR_ERR(req); + req->r_inode = inode; + ihold(inode); + req->r_num_caps = 1; + + req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL; + + req->r_args.setlayout.layout.fl_stripe_unit = + cpu_to_le32(l.stripe_unit); + req->r_args.setlayout.layout.fl_stripe_count = + cpu_to_le32(l.stripe_count); + req->r_args.setlayout.layout.fl_object_size = + cpu_to_le32(l.object_size); + req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool); + + err = ceph_mdsc_do_request(mdsc, NULL, req); + ceph_mdsc_put_request(req); + return err; +} + +/* + * Set a layout policy on a directory inode. All items in the tree + * rooted at this inode will inherit this layout on creation, + * (It doesn't apply retroactively ) + * unless a subdirectory has its own layout policy. + */ +static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg) +{ + struct inode *inode = file_inode(file); + struct ceph_mds_request *req; + struct ceph_ioctl_layout l; + int err; + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; + + /* copy and validate */ + if (copy_from_user(&l, arg, sizeof(l))) + return -EFAULT; + + err = __validate_layout(mdsc, &l); + if (err) + return err; + + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT, + USE_AUTH_MDS); + + if (IS_ERR(req)) + return PTR_ERR(req); + req->r_inode = inode; + ihold(inode); + req->r_num_caps = 1; + + req->r_args.setlayout.layout.fl_stripe_unit = + cpu_to_le32(l.stripe_unit); + req->r_args.setlayout.layout.fl_stripe_count = + cpu_to_le32(l.stripe_count); + req->r_args.setlayout.layout.fl_object_size = + cpu_to_le32(l.object_size); + req->r_args.setlayout.layout.fl_pg_pool = + cpu_to_le32(l.data_pool); + + err = ceph_mdsc_do_request(mdsc, inode, req); + ceph_mdsc_put_request(req); + return err; +} + +/* + * Return object name, size/offset information, and location (OSD + * number, network address) for a given file offset. + */ +static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg) +{ + struct ceph_ioctl_dataloc dl; + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_osd_client *osdc = + &ceph_sb_to_client(inode->i_sb)->client->osdc; + struct ceph_object_locator oloc; + struct ceph_object_id oid; + u64 len = 1, olen; + u64 tmp; + struct ceph_pg pgid; + int r; + + /* copy and validate */ + if (copy_from_user(&dl, arg, sizeof(dl))) + return -EFAULT; + + down_read(&osdc->map_sem); + r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, len, + &dl.object_no, &dl.object_offset, + &olen); + if (r < 0) { + up_read(&osdc->map_sem); + return -EIO; + } + dl.file_offset -= dl.object_offset; + dl.object_size = ceph_file_layout_object_size(ci->i_layout); + dl.block_size = ceph_file_layout_su(ci->i_layout); + + /* block_offset = object_offset % block_size */ + tmp = dl.object_offset; + dl.block_offset = do_div(tmp, dl.block_size); + + snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx", + ceph_ino(inode), dl.object_no); + + oloc.pool = ceph_file_layout_pg_pool(ci->i_layout); + ceph_oid_set_name(&oid, dl.object_name); + + r = ceph_oloc_oid_to_pg(osdc->osdmap, &oloc, &oid, &pgid); + if (r < 0) { + up_read(&osdc->map_sem); + return r; + } + + dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid); + if (dl.osd >= 0) { + struct ceph_entity_addr *a = + ceph_osd_addr(osdc->osdmap, dl.osd); + if (a) + memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr)); + } else { + memset(&dl.osd_addr, 0, sizeof(dl.osd_addr)); + } + up_read(&osdc->map_sem); + + /* send result back to user */ + if (copy_to_user(arg, &dl, sizeof(dl))) + return -EFAULT; + + return 0; +} + +static long ceph_ioctl_lazyio(struct file *file) +{ + struct ceph_file_info *fi = file->private_data; + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + + if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) { + spin_lock(&ci->i_ceph_lock); + ci->i_nr_by_mode[fi->fmode]--; + fi->fmode |= CEPH_FILE_MODE_LAZY; + ci->i_nr_by_mode[fi->fmode]++; + spin_unlock(&ci->i_ceph_lock); + dout("ioctl_layzio: file %p marked lazy\n", file); + + ceph_check_caps(ci, 0, NULL); + } else { + dout("ioctl_layzio: file %p already lazy\n", file); + } + return 0; +} + +static long ceph_ioctl_syncio(struct file *file) +{ + struct ceph_file_info *fi = file->private_data; + + fi->flags |= CEPH_F_SYNC; + return 0; +} + +long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg); + switch (cmd) { + case CEPH_IOC_GET_LAYOUT: + return ceph_ioctl_get_layout(file, (void __user *)arg); + + case CEPH_IOC_SET_LAYOUT: + return ceph_ioctl_set_layout(file, (void __user *)arg); + + case CEPH_IOC_SET_LAYOUT_POLICY: + return ceph_ioctl_set_layout_policy(file, (void __user *)arg); + + case CEPH_IOC_GET_DATALOC: + return ceph_ioctl_get_dataloc(file, (void __user *)arg); + + case CEPH_IOC_LAZYIO: + return ceph_ioctl_lazyio(file); + + case CEPH_IOC_SYNCIO: + return ceph_ioctl_syncio(file); + } + + return -ENOTTY; +} diff --git a/kernel/fs/ceph/ioctl.h b/kernel/fs/ceph/ioctl.h new file mode 100644 index 000000000..c77028afb --- /dev/null +++ b/kernel/fs/ceph/ioctl.h @@ -0,0 +1,100 @@ +#ifndef FS_CEPH_IOCTL_H +#define FS_CEPH_IOCTL_H + +#include +#include + +#define CEPH_IOCTL_MAGIC 0x97 + +/* + * CEPH_IOC_GET_LAYOUT - get file layout or dir layout policy + * CEPH_IOC_SET_LAYOUT - set file layout + * CEPH_IOC_SET_LAYOUT_POLICY - set dir layout policy + * + * The file layout specifies how file data is striped over objects in + * the distributed object store, which object pool they belong to (if + * it differs from the default), and an optional 'preferred osd' to + * store them on. + * + * Files get a new layout based on the policy set on the containing + * directory or one of its ancestors. The GET_LAYOUT ioctl will let + * you examine the layout for a file or the policy on a directory. + * + * SET_LAYOUT will let you set a layout on a newly created file. This + * only works immediately after the file is created and before any + * data is written to it. + * + * SET_LAYOUT_POLICY will let you set a layout policy (default layout) + * on a directory that will apply to any new files created in that + * directory (or any child directory that doesn't specify a layout of + * its own). + */ + +/* use u64 to align sanely on all archs */ +struct ceph_ioctl_layout { + __u64 stripe_unit, stripe_count, object_size; + __u64 data_pool; + + /* obsolete. new values ignored, always return -1 */ + __s64 preferred_osd; +}; + +#define CEPH_IOC_GET_LAYOUT _IOR(CEPH_IOCTL_MAGIC, 1, \ + struct ceph_ioctl_layout) +#define CEPH_IOC_SET_LAYOUT _IOW(CEPH_IOCTL_MAGIC, 2, \ + struct ceph_ioctl_layout) +#define CEPH_IOC_SET_LAYOUT_POLICY _IOW(CEPH_IOCTL_MAGIC, 5, \ + struct ceph_ioctl_layout) + +/* + * CEPH_IOC_GET_DATALOC - get location of file data in the cluster + * + * Extract identity, address of the OSD and object storing a given + * file offset. + */ +struct ceph_ioctl_dataloc { + __u64 file_offset; /* in+out: file offset */ + __u64 object_offset; /* out: offset in object */ + __u64 object_no; /* out: object # */ + __u64 object_size; /* out: object size */ + char object_name[64]; /* out: object name */ + __u64 block_offset; /* out: offset in block */ + __u64 block_size; /* out: block length */ + __s64 osd; /* out: osd # */ + struct sockaddr_storage osd_addr; /* out: osd address */ +}; + +#define CEPH_IOC_GET_DATALOC _IOWR(CEPH_IOCTL_MAGIC, 3, \ + struct ceph_ioctl_dataloc) + +/* + * CEPH_IOC_LAZYIO - relax consistency + * + * Normally Ceph switches to synchronous IO when multiple clients have + * the file open (and or more for write). Reads and writes bypass the + * page cache and go directly to the OSD. Setting this flag on a file + * descriptor will allow buffered IO for this file in cases where the + * application knows it won't interfere with other nodes (or doesn't + * care). + */ +#define CEPH_IOC_LAZYIO _IO(CEPH_IOCTL_MAGIC, 4) + +/* + * CEPH_IOC_SYNCIO - force synchronous IO + * + * This ioctl sets a file flag that forces the synchronous IO that + * bypasses the page cache, even if it is not necessary. This is + * essentially the opposite behavior of IOC_LAZYIO. This forces the + * same read/write path as a file opened by multiple clients when one + * or more of those clients is opened for write. + * + * Note that this type of sync IO takes a different path than a file + * opened with O_SYNC/D_SYNC (writes hit the page cache and are + * immediately flushed on page boundaries). It is very similar to + * O_DIRECT (writes bypass the page cache) excep that O_DIRECT writes + * are not copied (user page must remain stable) and O_DIRECT writes + * have alignment restrictions (on the buffer and file offset). + */ +#define CEPH_IOC_SYNCIO _IO(CEPH_IOCTL_MAGIC, 5) + +#endif diff --git a/kernel/fs/ceph/locks.c b/kernel/fs/ceph/locks.c new file mode 100644 index 000000000..4347039ec --- /dev/null +++ b/kernel/fs/ceph/locks.c @@ -0,0 +1,381 @@ +#include + +#include +#include +#include + +#include "super.h" +#include "mds_client.h" +#include + +static u64 lock_secret; +static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req); + +static inline u64 secure_addr(void *addr) +{ + u64 v = lock_secret ^ (u64)(unsigned long)addr; + /* + * Set the most significant bit, so that MDS knows the 'owner' + * is sufficient to identify the owner of lock. (old code uses + * both 'owner' and 'pid') + */ + v |= (1ULL << 63); + return v; +} + +void __init ceph_flock_init(void) +{ + get_random_bytes(&lock_secret, sizeof(lock_secret)); +} + +/** + * Implement fcntl and flock locking functions. + */ +static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file, + int cmd, u8 wait, struct file_lock *fl) +{ + struct inode *inode = file_inode(file); + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; + struct ceph_mds_request *req; + int err; + u64 length = 0; + u64 owner; + + if (operation != CEPH_MDS_OP_SETFILELOCK || cmd == CEPH_LOCK_UNLOCK) + wait = 0; + + req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS); + if (IS_ERR(req)) + return PTR_ERR(req); + req->r_inode = inode; + ihold(inode); + req->r_num_caps = 1; + + /* mds requires start and length rather than start and end */ + if (LLONG_MAX == fl->fl_end) + length = 0; + else + length = fl->fl_end - fl->fl_start + 1; + + owner = secure_addr(fl->fl_owner); + + dout("ceph_lock_message: rule: %d, op: %d, owner: %llx, pid: %llu, " + "start: %llu, length: %llu, wait: %d, type: %d", (int)lock_type, + (int)operation, owner, (u64)fl->fl_pid, fl->fl_start, length, + wait, fl->fl_type); + + req->r_args.filelock_change.rule = lock_type; + req->r_args.filelock_change.type = cmd; + req->r_args.filelock_change.owner = cpu_to_le64(owner); + req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid); + req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start); + req->r_args.filelock_change.length = cpu_to_le64(length); + req->r_args.filelock_change.wait = wait; + + if (wait) + req->r_wait_for_completion = ceph_lock_wait_for_completion; + + err = ceph_mdsc_do_request(mdsc, inode, req); + + if (operation == CEPH_MDS_OP_GETFILELOCK) { + fl->fl_pid = le64_to_cpu(req->r_reply_info.filelock_reply->pid); + if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type) + fl->fl_type = F_RDLCK; + else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type) + fl->fl_type = F_WRLCK; + else + fl->fl_type = F_UNLCK; + + fl->fl_start = le64_to_cpu(req->r_reply_info.filelock_reply->start); + length = le64_to_cpu(req->r_reply_info.filelock_reply->start) + + le64_to_cpu(req->r_reply_info.filelock_reply->length); + if (length >= 1) + fl->fl_end = length -1; + else + fl->fl_end = 0; + + } + ceph_mdsc_put_request(req); + dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, " + "length: %llu, wait: %d, type: %d, err code %d", (int)lock_type, + (int)operation, (u64)fl->fl_pid, fl->fl_start, + length, wait, fl->fl_type, err); + return err; +} + +static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req) +{ + struct ceph_mds_request *intr_req; + struct inode *inode = req->r_inode; + int err, lock_type; + + BUG_ON(req->r_op != CEPH_MDS_OP_SETFILELOCK); + if (req->r_args.filelock_change.rule == CEPH_LOCK_FCNTL) + lock_type = CEPH_LOCK_FCNTL_INTR; + else if (req->r_args.filelock_change.rule == CEPH_LOCK_FLOCK) + lock_type = CEPH_LOCK_FLOCK_INTR; + else + BUG_ON(1); + BUG_ON(req->r_args.filelock_change.type == CEPH_LOCK_UNLOCK); + + err = wait_for_completion_interruptible(&req->r_completion); + if (!err) + return 0; + + dout("ceph_lock_wait_for_completion: request %llu was interrupted\n", + req->r_tid); + + intr_req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETFILELOCK, + USE_AUTH_MDS); + if (IS_ERR(intr_req)) + return PTR_ERR(intr_req); + + intr_req->r_inode = inode; + ihold(inode); + intr_req->r_num_caps = 1; + + intr_req->r_args.filelock_change = req->r_args.filelock_change; + intr_req->r_args.filelock_change.rule = lock_type; + intr_req->r_args.filelock_change.type = CEPH_LOCK_UNLOCK; + + err = ceph_mdsc_do_request(mdsc, inode, intr_req); + ceph_mdsc_put_request(intr_req); + + if (err && err != -ERESTARTSYS) + return err; + + wait_for_completion(&req->r_completion); + return 0; +} + +/** + * Attempt to set an fcntl lock. + * For now, this just goes away to the server. Later it may be more awesome. + */ +int ceph_lock(struct file *file, int cmd, struct file_lock *fl) +{ + u8 lock_cmd; + int err; + u8 wait = 0; + u16 op = CEPH_MDS_OP_SETFILELOCK; + + if (!(fl->fl_flags & FL_POSIX)) + return -ENOLCK; + /* No mandatory locks */ + if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK) + return -ENOLCK; + + dout("ceph_lock, fl_owner: %p", fl->fl_owner); + + /* set wait bit as appropriate, then make command as Ceph expects it*/ + if (IS_GETLK(cmd)) + op = CEPH_MDS_OP_GETFILELOCK; + else if (IS_SETLKW(cmd)) + wait = 1; + + if (F_RDLCK == fl->fl_type) + lock_cmd = CEPH_LOCK_SHARED; + else if (F_WRLCK == fl->fl_type) + lock_cmd = CEPH_LOCK_EXCL; + else + lock_cmd = CEPH_LOCK_UNLOCK; + + err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl); + if (!err) { + if (op != CEPH_MDS_OP_GETFILELOCK) { + dout("mds locked, locking locally"); + err = posix_lock_file(file, fl, NULL); + if (err && (CEPH_MDS_OP_SETFILELOCK == op)) { + /* undo! This should only happen if + * the kernel detects local + * deadlock. */ + ceph_lock_message(CEPH_LOCK_FCNTL, op, file, + CEPH_LOCK_UNLOCK, 0, fl); + dout("got %d on posix_lock_file, undid lock", + err); + } + } + } + return err; +} + +int ceph_flock(struct file *file, int cmd, struct file_lock *fl) +{ + u8 lock_cmd; + int err; + u8 wait = 0; + + if (!(fl->fl_flags & FL_FLOCK)) + return -ENOLCK; + /* No mandatory locks */ + if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK) + return -ENOLCK; + + dout("ceph_flock, fl_file: %p", fl->fl_file); + + if (IS_SETLKW(cmd)) + wait = 1; + + if (F_RDLCK == fl->fl_type) + lock_cmd = CEPH_LOCK_SHARED; + else if (F_WRLCK == fl->fl_type) + lock_cmd = CEPH_LOCK_EXCL; + else + lock_cmd = CEPH_LOCK_UNLOCK; + + err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK, + file, lock_cmd, wait, fl); + if (!err) { + err = flock_lock_file_wait(file, fl); + if (err) { + ceph_lock_message(CEPH_LOCK_FLOCK, + CEPH_MDS_OP_SETFILELOCK, + file, CEPH_LOCK_UNLOCK, 0, fl); + dout("got %d on flock_lock_file_wait, undid lock", err); + } + } + return err; +} + +/* + * Fills in the passed counter variables, so you can prepare pagelist metadata + * before calling ceph_encode_locks. + */ +void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count) +{ + struct file_lock *lock; + struct file_lock_context *ctx; + + *fcntl_count = 0; + *flock_count = 0; + + ctx = inode->i_flctx; + if (ctx) { + spin_lock(&ctx->flc_lock); + list_for_each_entry(lock, &ctx->flc_posix, fl_list) + ++(*fcntl_count); + list_for_each_entry(lock, &ctx->flc_flock, fl_list) + ++(*flock_count); + spin_unlock(&ctx->flc_lock); + } + dout("counted %d flock locks and %d fcntl locks", + *flock_count, *fcntl_count); +} + +/** + * Encode the flock and fcntl locks for the given inode into the ceph_filelock + * array. Must be called with inode->i_lock already held. + * If we encounter more of a specific lock type than expected, return -ENOSPC. + */ +int ceph_encode_locks_to_buffer(struct inode *inode, + struct ceph_filelock *flocks, + int num_fcntl_locks, int num_flock_locks) +{ + struct file_lock *lock; + struct file_lock_context *ctx = inode->i_flctx; + int err = 0; + int seen_fcntl = 0; + int seen_flock = 0; + int l = 0; + + dout("encoding %d flock and %d fcntl locks", num_flock_locks, + num_fcntl_locks); + + if (!ctx) + return 0; + + spin_lock(&ctx->flc_lock); + list_for_each_entry(lock, &ctx->flc_flock, fl_list) { + ++seen_fcntl; + if (seen_fcntl > num_fcntl_locks) { + err = -ENOSPC; + goto fail; + } + err = lock_to_ceph_filelock(lock, &flocks[l]); + if (err) + goto fail; + ++l; + } + list_for_each_entry(lock, &ctx->flc_flock, fl_list) { + ++seen_flock; + if (seen_flock > num_flock_locks) { + err = -ENOSPC; + goto fail; + } + err = lock_to_ceph_filelock(lock, &flocks[l]); + if (err) + goto fail; + ++l; + } +fail: + spin_unlock(&ctx->flc_lock); + return err; +} + +/** + * Copy the encoded flock and fcntl locks into the pagelist. + * Format is: #fcntl locks, sequential fcntl locks, #flock locks, + * sequential flock locks. + * Returns zero on success. + */ +int ceph_locks_to_pagelist(struct ceph_filelock *flocks, + struct ceph_pagelist *pagelist, + int num_fcntl_locks, int num_flock_locks) +{ + int err = 0; + __le32 nlocks; + + nlocks = cpu_to_le32(num_fcntl_locks); + err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks)); + if (err) + goto out_fail; + + err = ceph_pagelist_append(pagelist, flocks, + num_fcntl_locks * sizeof(*flocks)); + if (err) + goto out_fail; + + nlocks = cpu_to_le32(num_flock_locks); + err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks)); + if (err) + goto out_fail; + + err = ceph_pagelist_append(pagelist, + &flocks[num_fcntl_locks], + num_flock_locks * sizeof(*flocks)); +out_fail: + return err; +} + +/* + * Given a pointer to a lock, convert it to a ceph filelock + */ +int lock_to_ceph_filelock(struct file_lock *lock, + struct ceph_filelock *cephlock) +{ + int err = 0; + cephlock->start = cpu_to_le64(lock->fl_start); + cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1); + cephlock->client = cpu_to_le64(0); + cephlock->pid = cpu_to_le64((u64)lock->fl_pid); + cephlock->owner = cpu_to_le64(secure_addr(lock->fl_owner)); + + switch (lock->fl_type) { + case F_RDLCK: + cephlock->type = CEPH_LOCK_SHARED; + break; + case F_WRLCK: + cephlock->type = CEPH_LOCK_EXCL; + break; + case F_UNLCK: + cephlock->type = CEPH_LOCK_UNLOCK; + break; + default: + dout("Have unknown lock type %d", lock->fl_type); + err = -EINVAL; + } + + return err; +} diff --git a/kernel/fs/ceph/mds_client.c b/kernel/fs/ceph/mds_client.c new file mode 100644 index 000000000..84f37f34f --- /dev/null +++ b/kernel/fs/ceph/mds_client.c @@ -0,0 +1,3871 @@ +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "super.h" +#include "mds_client.h" + +#include +#include +#include +#include +#include +#include + +/* + * A cluster of MDS (metadata server) daemons is responsible for + * managing the file system namespace (the directory hierarchy and + * inodes) and for coordinating shared access to storage. Metadata is + * partitioning hierarchically across a number of servers, and that + * partition varies over time as the cluster adjusts the distribution + * in order to balance load. + * + * The MDS client is primarily responsible to managing synchronous + * metadata requests for operations like open, unlink, and so forth. + * If there is a MDS failure, we find out about it when we (possibly + * request and) receive a new MDS map, and can resubmit affected + * requests. + * + * For the most part, though, we take advantage of a lossless + * communications channel to the MDS, and do not need to worry about + * timing out or resubmitting requests. + * + * We maintain a stateful "session" with each MDS we interact with. + * Within each session, we sent periodic heartbeat messages to ensure + * any capabilities or leases we have been issues remain valid. If + * the session times out and goes stale, our leases and capabilities + * are no longer valid. + */ + +struct ceph_reconnect_state { + int nr_caps; + struct ceph_pagelist *pagelist; + bool flock; +}; + +static void __wake_requests(struct ceph_mds_client *mdsc, + struct list_head *head); + +static const struct ceph_connection_operations mds_con_ops; + + +/* + * mds reply parsing + */ + +/* + * parse individual inode info + */ +static int parse_reply_info_in(void **p, void *end, + struct ceph_mds_reply_info_in *info, + u64 features) +{ + int err = -EIO; + + info->in = *p; + *p += sizeof(struct ceph_mds_reply_inode) + + sizeof(*info->in->fragtree.splits) * + le32_to_cpu(info->in->fragtree.nsplits); + + ceph_decode_32_safe(p, end, info->symlink_len, bad); + ceph_decode_need(p, end, info->symlink_len, bad); + info->symlink = *p; + *p += info->symlink_len; + + if (features & CEPH_FEATURE_DIRLAYOUTHASH) + ceph_decode_copy_safe(p, end, &info->dir_layout, + sizeof(info->dir_layout), bad); + else + memset(&info->dir_layout, 0, sizeof(info->dir_layout)); + + ceph_decode_32_safe(p, end, info->xattr_len, bad); + ceph_decode_need(p, end, info->xattr_len, bad); + info->xattr_data = *p; + *p += info->xattr_len; + + if (features & CEPH_FEATURE_MDS_INLINE_DATA) { + ceph_decode_64_safe(p, end, info->inline_version, bad); + ceph_decode_32_safe(p, end, info->inline_len, bad); + ceph_decode_need(p, end, info->inline_len, bad); + info->inline_data = *p; + *p += info->inline_len; + } else + info->inline_version = CEPH_INLINE_NONE; + + return 0; +bad: + return err; +} + +/* + * parse a normal reply, which may contain a (dir+)dentry and/or a + * target inode. + */ +static int parse_reply_info_trace(void **p, void *end, + struct ceph_mds_reply_info_parsed *info, + u64 features) +{ + int err; + + if (info->head->is_dentry) { + err = parse_reply_info_in(p, end, &info->diri, features); + if (err < 0) + goto out_bad; + + if (unlikely(*p + sizeof(*info->dirfrag) > end)) + goto bad; + info->dirfrag = *p; + *p += sizeof(*info->dirfrag) + + sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); + if (unlikely(*p > end)) + goto bad; + + ceph_decode_32_safe(p, end, info->dname_len, bad); + ceph_decode_need(p, end, info->dname_len, bad); + info->dname = *p; + *p += info->dname_len; + info->dlease = *p; + *p += sizeof(*info->dlease); + } + + if (info->head->is_target) { + err = parse_reply_info_in(p, end, &info->targeti, features); + if (err < 0) + goto out_bad; + } + + if (unlikely(*p != end)) + goto bad; + return 0; + +bad: + err = -EIO; +out_bad: + pr_err("problem parsing mds trace %d\n", err); + return err; +} + +/* + * parse readdir results + */ +static int parse_reply_info_dir(void **p, void *end, + struct ceph_mds_reply_info_parsed *info, + u64 features) +{ + u32 num, i = 0; + int err; + + info->dir_dir = *p; + if (*p + sizeof(*info->dir_dir) > end) + goto bad; + *p += sizeof(*info->dir_dir) + + sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); + if (*p > end) + goto bad; + + ceph_decode_need(p, end, sizeof(num) + 2, bad); + num = ceph_decode_32(p); + info->dir_end = ceph_decode_8(p); + info->dir_complete = ceph_decode_8(p); + if (num == 0) + goto done; + + BUG_ON(!info->dir_in); + info->dir_dname = (void *)(info->dir_in + num); + info->dir_dname_len = (void *)(info->dir_dname + num); + info->dir_dlease = (void *)(info->dir_dname_len + num); + if ((unsigned long)(info->dir_dlease + num) > + (unsigned long)info->dir_in + info->dir_buf_size) { + pr_err("dir contents are larger than expected\n"); + WARN_ON(1); + goto bad; + } + + info->dir_nr = num; + while (num) { + /* dentry */ + ceph_decode_need(p, end, sizeof(u32)*2, bad); + info->dir_dname_len[i] = ceph_decode_32(p); + ceph_decode_need(p, end, info->dir_dname_len[i], bad); + info->dir_dname[i] = *p; + *p += info->dir_dname_len[i]; + dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i], + info->dir_dname[i]); + info->dir_dlease[i] = *p; + *p += sizeof(struct ceph_mds_reply_lease); + + /* inode */ + err = parse_reply_info_in(p, end, &info->dir_in[i], features); + if (err < 0) + goto out_bad; + i++; + num--; + } + +done: + if (*p != end) + goto bad; + return 0; + +bad: + err = -EIO; +out_bad: + pr_err("problem parsing dir contents %d\n", err); + return err; +} + +/* + * parse fcntl F_GETLK results + */ +static int parse_reply_info_filelock(void **p, void *end, + struct ceph_mds_reply_info_parsed *info, + u64 features) +{ + if (*p + sizeof(*info->filelock_reply) > end) + goto bad; + + info->filelock_reply = *p; + *p += sizeof(*info->filelock_reply); + + if (unlikely(*p != end)) + goto bad; + return 0; + +bad: + return -EIO; +} + +/* + * parse create results + */ +static int parse_reply_info_create(void **p, void *end, + struct ceph_mds_reply_info_parsed *info, + u64 features) +{ + if (features & CEPH_FEATURE_REPLY_CREATE_INODE) { + if (*p == end) { + info->has_create_ino = false; + } else { + info->has_create_ino = true; + info->ino = ceph_decode_64(p); + } + } + + if (unlikely(*p != end)) + goto bad; + return 0; + +bad: + return -EIO; +} + +/* + * parse extra results + */ +static int parse_reply_info_extra(void **p, void *end, + struct ceph_mds_reply_info_parsed *info, + u64 features) +{ + if (info->head->op == CEPH_MDS_OP_GETFILELOCK) + return parse_reply_info_filelock(p, end, info, features); + else if (info->head->op == CEPH_MDS_OP_READDIR || + info->head->op == CEPH_MDS_OP_LSSNAP) + return parse_reply_info_dir(p, end, info, features); + else if (info->head->op == CEPH_MDS_OP_CREATE) + return parse_reply_info_create(p, end, info, features); + else + return -EIO; +} + +/* + * parse entire mds reply + */ +static int parse_reply_info(struct ceph_msg *msg, + struct ceph_mds_reply_info_parsed *info, + u64 features) +{ + void *p, *end; + u32 len; + int err; + + info->head = msg->front.iov_base; + p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); + end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); + + /* trace */ + ceph_decode_32_safe(&p, end, len, bad); + if (len > 0) { + ceph_decode_need(&p, end, len, bad); + err = parse_reply_info_trace(&p, p+len, info, features); + if (err < 0) + goto out_bad; + } + + /* extra */ + ceph_decode_32_safe(&p, end, len, bad); + if (len > 0) { + ceph_decode_need(&p, end, len, bad); + err = parse_reply_info_extra(&p, p+len, info, features); + if (err < 0) + goto out_bad; + } + + /* snap blob */ + ceph_decode_32_safe(&p, end, len, bad); + info->snapblob_len = len; + info->snapblob = p; + p += len; + + if (p != end) + goto bad; + return 0; + +bad: + err = -EIO; +out_bad: + pr_err("mds parse_reply err %d\n", err); + return err; +} + +static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) +{ + if (!info->dir_in) + return; + free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size)); +} + + +/* + * sessions + */ +const char *ceph_session_state_name(int s) +{ + switch (s) { + case CEPH_MDS_SESSION_NEW: return "new"; + case CEPH_MDS_SESSION_OPENING: return "opening"; + case CEPH_MDS_SESSION_OPEN: return "open"; + case CEPH_MDS_SESSION_HUNG: return "hung"; + case CEPH_MDS_SESSION_CLOSING: return "closing"; + case CEPH_MDS_SESSION_RESTARTING: return "restarting"; + case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; + default: return "???"; + } +} + +static struct ceph_mds_session *get_session(struct ceph_mds_session *s) +{ + if (atomic_inc_not_zero(&s->s_ref)) { + dout("mdsc get_session %p %d -> %d\n", s, + atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref)); + return s; + } else { + dout("mdsc get_session %p 0 -- FAIL", s); + return NULL; + } +} + +void ceph_put_mds_session(struct ceph_mds_session *s) +{ + dout("mdsc put_session %p %d -> %d\n", s, + atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1); + if (atomic_dec_and_test(&s->s_ref)) { + if (s->s_auth.authorizer) + ceph_auth_destroy_authorizer( + s->s_mdsc->fsc->client->monc.auth, + s->s_auth.authorizer); + kfree(s); + } +} + +/* + * called under mdsc->mutex + */ +struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, + int mds) +{ + struct ceph_mds_session *session; + + if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) + return NULL; + session = mdsc->sessions[mds]; + dout("lookup_mds_session %p %d\n", session, + atomic_read(&session->s_ref)); + get_session(session); + return session; +} + +static bool __have_session(struct ceph_mds_client *mdsc, int mds) +{ + if (mds >= mdsc->max_sessions) + return false; + return mdsc->sessions[mds]; +} + +static int __verify_registered_session(struct ceph_mds_client *mdsc, + struct ceph_mds_session *s) +{ + if (s->s_mds >= mdsc->max_sessions || + mdsc->sessions[s->s_mds] != s) + return -ENOENT; + return 0; +} + +/* + * create+register a new session for given mds. + * called under mdsc->mutex. + */ +static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, + int mds) +{ + struct ceph_mds_session *s; + + if (mds >= mdsc->mdsmap->m_max_mds) + return ERR_PTR(-EINVAL); + + s = kzalloc(sizeof(*s), GFP_NOFS); + if (!s) + return ERR_PTR(-ENOMEM); + s->s_mdsc = mdsc; + s->s_mds = mds; + s->s_state = CEPH_MDS_SESSION_NEW; + s->s_ttl = 0; + s->s_seq = 0; + mutex_init(&s->s_mutex); + + ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr); + + spin_lock_init(&s->s_gen_ttl_lock); + s->s_cap_gen = 0; + s->s_cap_ttl = jiffies - 1; + + spin_lock_init(&s->s_cap_lock); + s->s_renew_requested = 0; + s->s_renew_seq = 0; + INIT_LIST_HEAD(&s->s_caps); + s->s_nr_caps = 0; + s->s_trim_caps = 0; + atomic_set(&s->s_ref, 1); + INIT_LIST_HEAD(&s->s_waiting); + INIT_LIST_HEAD(&s->s_unsafe); + s->s_num_cap_releases = 0; + s->s_cap_reconnect = 0; + s->s_cap_iterator = NULL; + INIT_LIST_HEAD(&s->s_cap_releases); + INIT_LIST_HEAD(&s->s_cap_releases_done); + INIT_LIST_HEAD(&s->s_cap_flushing); + INIT_LIST_HEAD(&s->s_cap_snaps_flushing); + + dout("register_session mds%d\n", mds); + if (mds >= mdsc->max_sessions) { + int newmax = 1 << get_count_order(mds+1); + struct ceph_mds_session **sa; + + dout("register_session realloc to %d\n", newmax); + sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); + if (sa == NULL) + goto fail_realloc; + if (mdsc->sessions) { + memcpy(sa, mdsc->sessions, + mdsc->max_sessions * sizeof(void *)); + kfree(mdsc->sessions); + } + mdsc->sessions = sa; + mdsc->max_sessions = newmax; + } + mdsc->sessions[mds] = s; + atomic_inc(&mdsc->num_sessions); + atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */ + + ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds, + ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); + + return s; + +fail_realloc: + kfree(s); + return ERR_PTR(-ENOMEM); +} + +/* + * called under mdsc->mutex + */ +static void __unregister_session(struct ceph_mds_client *mdsc, + struct ceph_mds_session *s) +{ + dout("__unregister_session mds%d %p\n", s->s_mds, s); + BUG_ON(mdsc->sessions[s->s_mds] != s); + mdsc->sessions[s->s_mds] = NULL; + ceph_con_close(&s->s_con); + ceph_put_mds_session(s); + atomic_dec(&mdsc->num_sessions); +} + +/* + * drop session refs in request. + * + * should be last request ref, or hold mdsc->mutex + */ +static void put_request_session(struct ceph_mds_request *req) +{ + if (req->r_session) { + ceph_put_mds_session(req->r_session); + req->r_session = NULL; + } +} + +void ceph_mdsc_release_request(struct kref *kref) +{ + struct ceph_mds_request *req = container_of(kref, + struct ceph_mds_request, + r_kref); + destroy_reply_info(&req->r_reply_info); + if (req->r_request) + ceph_msg_put(req->r_request); + if (req->r_reply) + ceph_msg_put(req->r_reply); + if (req->r_inode) { + ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); + iput(req->r_inode); + } + if (req->r_locked_dir) + ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); + iput(req->r_target_inode); + if (req->r_dentry) + dput(req->r_dentry); + if (req->r_old_dentry) + dput(req->r_old_dentry); + if (req->r_old_dentry_dir) { + /* + * track (and drop pins for) r_old_dentry_dir + * separately, since r_old_dentry's d_parent may have + * changed between the dir mutex being dropped and + * this request being freed. + */ + ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), + CEPH_CAP_PIN); + iput(req->r_old_dentry_dir); + } + kfree(req->r_path1); + kfree(req->r_path2); + if (req->r_pagelist) + ceph_pagelist_release(req->r_pagelist); + put_request_session(req); + ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); + kfree(req); +} + +/* + * lookup session, bump ref if found. + * + * called under mdsc->mutex. + */ +static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc, + u64 tid) +{ + struct ceph_mds_request *req; + struct rb_node *n = mdsc->request_tree.rb_node; + + while (n) { + req = rb_entry(n, struct ceph_mds_request, r_node); + if (tid < req->r_tid) + n = n->rb_left; + else if (tid > req->r_tid) + n = n->rb_right; + else { + ceph_mdsc_get_request(req); + return req; + } + } + return NULL; +} + +static void __insert_request(struct ceph_mds_client *mdsc, + struct ceph_mds_request *new) +{ + struct rb_node **p = &mdsc->request_tree.rb_node; + struct rb_node *parent = NULL; + struct ceph_mds_request *req = NULL; + + while (*p) { + parent = *p; + req = rb_entry(parent, struct ceph_mds_request, r_node); + if (new->r_tid < req->r_tid) + p = &(*p)->rb_left; + else if (new->r_tid > req->r_tid) + p = &(*p)->rb_right; + else + BUG(); + } + + rb_link_node(&new->r_node, parent, p); + rb_insert_color(&new->r_node, &mdsc->request_tree); +} + +/* + * Register an in-flight request, and assign a tid. Link to directory + * are modifying (if any). + * + * Called under mdsc->mutex. + */ +static void __register_request(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req, + struct inode *dir) +{ + req->r_tid = ++mdsc->last_tid; + if (req->r_num_caps) + ceph_reserve_caps(mdsc, &req->r_caps_reservation, + req->r_num_caps); + dout("__register_request %p tid %lld\n", req, req->r_tid); + ceph_mdsc_get_request(req); + __insert_request(mdsc, req); + + req->r_uid = current_fsuid(); + req->r_gid = current_fsgid(); + + if (dir) { + struct ceph_inode_info *ci = ceph_inode(dir); + + ihold(dir); + spin_lock(&ci->i_unsafe_lock); + req->r_unsafe_dir = dir; + list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); + spin_unlock(&ci->i_unsafe_lock); + } +} + +static void __unregister_request(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req) +{ + dout("__unregister_request %p tid %lld\n", req, req->r_tid); + rb_erase(&req->r_node, &mdsc->request_tree); + RB_CLEAR_NODE(&req->r_node); + + if (req->r_unsafe_dir) { + struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); + + spin_lock(&ci->i_unsafe_lock); + list_del_init(&req->r_unsafe_dir_item); + spin_unlock(&ci->i_unsafe_lock); + + iput(req->r_unsafe_dir); + req->r_unsafe_dir = NULL; + } + + complete_all(&req->r_safe_completion); + + ceph_mdsc_put_request(req); +} + +/* + * Choose mds to send request to next. If there is a hint set in the + * request (e.g., due to a prior forward hint from the mds), use that. + * Otherwise, consult frag tree and/or caps to identify the + * appropriate mds. If all else fails, choose randomly. + * + * Called under mdsc->mutex. + */ +static struct dentry *get_nonsnap_parent(struct dentry *dentry) +{ + /* + * we don't need to worry about protecting the d_parent access + * here because we never renaming inside the snapped namespace + * except to resplice to another snapdir, and either the old or new + * result is a valid result. + */ + while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) + dentry = dentry->d_parent; + return dentry; +} + +static int __choose_mds(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req) +{ + struct inode *inode; + struct ceph_inode_info *ci; + struct ceph_cap *cap; + int mode = req->r_direct_mode; + int mds = -1; + u32 hash = req->r_direct_hash; + bool is_hash = req->r_direct_is_hash; + + /* + * is there a specific mds we should try? ignore hint if we have + * no session and the mds is not up (active or recovering). + */ + if (req->r_resend_mds >= 0 && + (__have_session(mdsc, req->r_resend_mds) || + ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { + dout("choose_mds using resend_mds mds%d\n", + req->r_resend_mds); + return req->r_resend_mds; + } + + if (mode == USE_RANDOM_MDS) + goto random; + + inode = NULL; + if (req->r_inode) { + inode = req->r_inode; + } else if (req->r_dentry) { + /* ignore race with rename; old or new d_parent is okay */ + struct dentry *parent = req->r_dentry->d_parent; + struct inode *dir = d_inode(parent); + + if (dir->i_sb != mdsc->fsc->sb) { + /* not this fs! */ + inode = d_inode(req->r_dentry); + } else if (ceph_snap(dir) != CEPH_NOSNAP) { + /* direct snapped/virtual snapdir requests + * based on parent dir inode */ + struct dentry *dn = get_nonsnap_parent(parent); + inode = d_inode(dn); + dout("__choose_mds using nonsnap parent %p\n", inode); + } else { + /* dentry target */ + inode = d_inode(req->r_dentry); + if (!inode || mode == USE_AUTH_MDS) { + /* dir + name */ + inode = dir; + hash = ceph_dentry_hash(dir, req->r_dentry); + is_hash = true; + } + } + } + + dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, + (int)hash, mode); + if (!inode) + goto random; + ci = ceph_inode(inode); + + if (is_hash && S_ISDIR(inode->i_mode)) { + struct ceph_inode_frag frag; + int found; + + ceph_choose_frag(ci, hash, &frag, &found); + if (found) { + if (mode == USE_ANY_MDS && frag.ndist > 0) { + u8 r; + + /* choose a random replica */ + get_random_bytes(&r, 1); + r %= frag.ndist; + mds = frag.dist[r]; + dout("choose_mds %p %llx.%llx " + "frag %u mds%d (%d/%d)\n", + inode, ceph_vinop(inode), + frag.frag, mds, + (int)r, frag.ndist); + if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= + CEPH_MDS_STATE_ACTIVE) + return mds; + } + + /* since this file/dir wasn't known to be + * replicated, then we want to look for the + * authoritative mds. */ + mode = USE_AUTH_MDS; + if (frag.mds >= 0) { + /* choose auth mds */ + mds = frag.mds; + dout("choose_mds %p %llx.%llx " + "frag %u mds%d (auth)\n", + inode, ceph_vinop(inode), frag.frag, mds); + if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= + CEPH_MDS_STATE_ACTIVE) + return mds; + } + } + } + + spin_lock(&ci->i_ceph_lock); + cap = NULL; + if (mode == USE_AUTH_MDS) + cap = ci->i_auth_cap; + if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) + cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); + if (!cap) { + spin_unlock(&ci->i_ceph_lock); + goto random; + } + mds = cap->session->s_mds; + dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", + inode, ceph_vinop(inode), mds, + cap == ci->i_auth_cap ? "auth " : "", cap); + spin_unlock(&ci->i_ceph_lock); + return mds; + +random: + mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); + dout("choose_mds chose random mds%d\n", mds); + return mds; +} + + +/* + * session messages + */ +static struct ceph_msg *create_session_msg(u32 op, u64 seq) +{ + struct ceph_msg *msg; + struct ceph_mds_session_head *h; + + msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, + false); + if (!msg) { + pr_err("create_session_msg ENOMEM creating msg\n"); + return NULL; + } + h = msg->front.iov_base; + h->op = cpu_to_le32(op); + h->seq = cpu_to_le64(seq); + + return msg; +} + +/* + * session message, specialization for CEPH_SESSION_REQUEST_OPEN + * to include additional client metadata fields. + */ +static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq) +{ + struct ceph_msg *msg; + struct ceph_mds_session_head *h; + int i = -1; + int metadata_bytes = 0; + int metadata_key_count = 0; + struct ceph_options *opt = mdsc->fsc->client->options; + void *p; + + const char* metadata[][2] = { + {"hostname", utsname()->nodename}, + {"kernel_version", utsname()->release}, + {"entity_id", opt->name ? opt->name : ""}, + {NULL, NULL} + }; + + /* Calculate serialized length of metadata */ + metadata_bytes = 4; /* map length */ + for (i = 0; metadata[i][0] != NULL; ++i) { + metadata_bytes += 8 + strlen(metadata[i][0]) + + strlen(metadata[i][1]); + metadata_key_count++; + } + + /* Allocate the message */ + msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes, + GFP_NOFS, false); + if (!msg) { + pr_err("create_session_msg ENOMEM creating msg\n"); + return NULL; + } + h = msg->front.iov_base; + h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN); + h->seq = cpu_to_le64(seq); + + /* + * Serialize client metadata into waiting buffer space, using + * the format that userspace expects for map + * + * ClientSession messages with metadata are v2 + */ + msg->hdr.version = cpu_to_le16(2); + msg->hdr.compat_version = cpu_to_le16(1); + + /* The write pointer, following the session_head structure */ + p = msg->front.iov_base + sizeof(*h); + + /* Number of entries in the map */ + ceph_encode_32(&p, metadata_key_count); + + /* Two length-prefixed strings for each entry in the map */ + for (i = 0; metadata[i][0] != NULL; ++i) { + size_t const key_len = strlen(metadata[i][0]); + size_t const val_len = strlen(metadata[i][1]); + + ceph_encode_32(&p, key_len); + memcpy(p, metadata[i][0], key_len); + p += key_len; + ceph_encode_32(&p, val_len); + memcpy(p, metadata[i][1], val_len); + p += val_len; + } + + return msg; +} + +/* + * send session open request. + * + * called under mdsc->mutex + */ +static int __open_session(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_msg *msg; + int mstate; + int mds = session->s_mds; + + /* wait for mds to go active? */ + mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); + dout("open_session to mds%d (%s)\n", mds, + ceph_mds_state_name(mstate)); + session->s_state = CEPH_MDS_SESSION_OPENING; + session->s_renew_requested = jiffies; + + /* send connect message */ + msg = create_session_open_msg(mdsc, session->s_seq); + if (!msg) + return -ENOMEM; + ceph_con_send(&session->s_con, msg); + return 0; +} + +/* + * open sessions for any export targets for the given mds + * + * called under mdsc->mutex + */ +static struct ceph_mds_session * +__open_export_target_session(struct ceph_mds_client *mdsc, int target) +{ + struct ceph_mds_session *session; + + session = __ceph_lookup_mds_session(mdsc, target); + if (!session) { + session = register_session(mdsc, target); + if (IS_ERR(session)) + return session; + } + if (session->s_state == CEPH_MDS_SESSION_NEW || + session->s_state == CEPH_MDS_SESSION_CLOSING) + __open_session(mdsc, session); + + return session; +} + +struct ceph_mds_session * +ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target) +{ + struct ceph_mds_session *session; + + dout("open_export_target_session to mds%d\n", target); + + mutex_lock(&mdsc->mutex); + session = __open_export_target_session(mdsc, target); + mutex_unlock(&mdsc->mutex); + + return session; +} + +static void __open_export_target_sessions(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_mds_info *mi; + struct ceph_mds_session *ts; + int i, mds = session->s_mds; + + if (mds >= mdsc->mdsmap->m_max_mds) + return; + + mi = &mdsc->mdsmap->m_info[mds]; + dout("open_export_target_sessions for mds%d (%d targets)\n", + session->s_mds, mi->num_export_targets); + + for (i = 0; i < mi->num_export_targets; i++) { + ts = __open_export_target_session(mdsc, mi->export_targets[i]); + if (!IS_ERR(ts)) + ceph_put_mds_session(ts); + } +} + +void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + mutex_lock(&mdsc->mutex); + __open_export_target_sessions(mdsc, session); + mutex_unlock(&mdsc->mutex); +} + +/* + * session caps + */ + +/* + * Free preallocated cap messages assigned to this session + */ +static void cleanup_cap_releases(struct ceph_mds_session *session) +{ + struct ceph_msg *msg; + + spin_lock(&session->s_cap_lock); + while (!list_empty(&session->s_cap_releases)) { + msg = list_first_entry(&session->s_cap_releases, + struct ceph_msg, list_head); + list_del_init(&msg->list_head); + ceph_msg_put(msg); + } + while (!list_empty(&session->s_cap_releases_done)) { + msg = list_first_entry(&session->s_cap_releases_done, + struct ceph_msg, list_head); + list_del_init(&msg->list_head); + ceph_msg_put(msg); + } + spin_unlock(&session->s_cap_lock); +} + +static void cleanup_session_requests(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_mds_request *req; + struct rb_node *p; + + dout("cleanup_session_requests mds%d\n", session->s_mds); + mutex_lock(&mdsc->mutex); + while (!list_empty(&session->s_unsafe)) { + req = list_first_entry(&session->s_unsafe, + struct ceph_mds_request, r_unsafe_item); + list_del_init(&req->r_unsafe_item); + pr_info(" dropping unsafe request %llu\n", req->r_tid); + __unregister_request(mdsc, req); + } + /* zero r_attempts, so kick_requests() will re-send requests */ + p = rb_first(&mdsc->request_tree); + while (p) { + req = rb_entry(p, struct ceph_mds_request, r_node); + p = rb_next(p); + if (req->r_session && + req->r_session->s_mds == session->s_mds) + req->r_attempts = 0; + } + mutex_unlock(&mdsc->mutex); +} + +/* + * Helper to safely iterate over all caps associated with a session, with + * special care taken to handle a racing __ceph_remove_cap(). + * + * Caller must hold session s_mutex. + */ +static int iterate_session_caps(struct ceph_mds_session *session, + int (*cb)(struct inode *, struct ceph_cap *, + void *), void *arg) +{ + struct list_head *p; + struct ceph_cap *cap; + struct inode *inode, *last_inode = NULL; + struct ceph_cap *old_cap = NULL; + int ret; + + dout("iterate_session_caps %p mds%d\n", session, session->s_mds); + spin_lock(&session->s_cap_lock); + p = session->s_caps.next; + while (p != &session->s_caps) { + cap = list_entry(p, struct ceph_cap, session_caps); + inode = igrab(&cap->ci->vfs_inode); + if (!inode) { + p = p->next; + continue; + } + session->s_cap_iterator = cap; + spin_unlock(&session->s_cap_lock); + + if (last_inode) { + iput(last_inode); + last_inode = NULL; + } + if (old_cap) { + ceph_put_cap(session->s_mdsc, old_cap); + old_cap = NULL; + } + + ret = cb(inode, cap, arg); + last_inode = inode; + + spin_lock(&session->s_cap_lock); + p = p->next; + if (cap->ci == NULL) { + dout("iterate_session_caps finishing cap %p removal\n", + cap); + BUG_ON(cap->session != session); + list_del_init(&cap->session_caps); + session->s_nr_caps--; + cap->session = NULL; + old_cap = cap; /* put_cap it w/o locks held */ + } + if (ret < 0) + goto out; + } + ret = 0; +out: + session->s_cap_iterator = NULL; + spin_unlock(&session->s_cap_lock); + + iput(last_inode); + if (old_cap) + ceph_put_cap(session->s_mdsc, old_cap); + + return ret; +} + +static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, + void *arg) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int drop = 0; + + dout("removing cap %p, ci is %p, inode is %p\n", + cap, ci, &ci->vfs_inode); + spin_lock(&ci->i_ceph_lock); + __ceph_remove_cap(cap, false); + if (!ci->i_auth_cap) { + struct ceph_mds_client *mdsc = + ceph_sb_to_client(inode->i_sb)->mdsc; + + spin_lock(&mdsc->cap_dirty_lock); + if (!list_empty(&ci->i_dirty_item)) { + pr_info(" dropping dirty %s state for %p %lld\n", + ceph_cap_string(ci->i_dirty_caps), + inode, ceph_ino(inode)); + ci->i_dirty_caps = 0; + list_del_init(&ci->i_dirty_item); + drop = 1; + } + if (!list_empty(&ci->i_flushing_item)) { + pr_info(" dropping dirty+flushing %s state for %p %lld\n", + ceph_cap_string(ci->i_flushing_caps), + inode, ceph_ino(inode)); + ci->i_flushing_caps = 0; + list_del_init(&ci->i_flushing_item); + mdsc->num_cap_flushing--; + drop = 1; + } + spin_unlock(&mdsc->cap_dirty_lock); + } + spin_unlock(&ci->i_ceph_lock); + while (drop--) + iput(inode); + return 0; +} + +/* + * caller must hold session s_mutex + */ +static void remove_session_caps(struct ceph_mds_session *session) +{ + dout("remove_session_caps on %p\n", session); + iterate_session_caps(session, remove_session_caps_cb, NULL); + + spin_lock(&session->s_cap_lock); + if (session->s_nr_caps > 0) { + struct super_block *sb = session->s_mdsc->fsc->sb; + struct inode *inode; + struct ceph_cap *cap, *prev = NULL; + struct ceph_vino vino; + /* + * iterate_session_caps() skips inodes that are being + * deleted, we need to wait until deletions are complete. + * __wait_on_freeing_inode() is designed for the job, + * but it is not exported, so use lookup inode function + * to access it. + */ + while (!list_empty(&session->s_caps)) { + cap = list_entry(session->s_caps.next, + struct ceph_cap, session_caps); + if (cap == prev) + break; + prev = cap; + vino = cap->ci->i_vino; + spin_unlock(&session->s_cap_lock); + + inode = ceph_find_inode(sb, vino); + iput(inode); + + spin_lock(&session->s_cap_lock); + } + } + spin_unlock(&session->s_cap_lock); + + BUG_ON(session->s_nr_caps > 0); + BUG_ON(!list_empty(&session->s_cap_flushing)); + cleanup_cap_releases(session); +} + +/* + * wake up any threads waiting on this session's caps. if the cap is + * old (didn't get renewed on the client reconnect), remove it now. + * + * caller must hold s_mutex. + */ +static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, + void *arg) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + + wake_up_all(&ci->i_cap_wq); + if (arg) { + spin_lock(&ci->i_ceph_lock); + ci->i_wanted_max_size = 0; + ci->i_requested_max_size = 0; + spin_unlock(&ci->i_ceph_lock); + } + return 0; +} + +static void wake_up_session_caps(struct ceph_mds_session *session, + int reconnect) +{ + dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); + iterate_session_caps(session, wake_up_session_cb, + (void *)(unsigned long)reconnect); +} + +/* + * Send periodic message to MDS renewing all currently held caps. The + * ack will reset the expiration for all caps from this session. + * + * caller holds s_mutex + */ +static int send_renew_caps(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_msg *msg; + int state; + + if (time_after_eq(jiffies, session->s_cap_ttl) && + time_after_eq(session->s_cap_ttl, session->s_renew_requested)) + pr_info("mds%d caps stale\n", session->s_mds); + session->s_renew_requested = jiffies; + + /* do not try to renew caps until a recovering mds has reconnected + * with its clients. */ + state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); + if (state < CEPH_MDS_STATE_RECONNECT) { + dout("send_renew_caps ignoring mds%d (%s)\n", + session->s_mds, ceph_mds_state_name(state)); + return 0; + } + + dout("send_renew_caps to mds%d (%s)\n", session->s_mds, + ceph_mds_state_name(state)); + msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, + ++session->s_renew_seq); + if (!msg) + return -ENOMEM; + ceph_con_send(&session->s_con, msg); + return 0; +} + +static int send_flushmsg_ack(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session, u64 seq) +{ + struct ceph_msg *msg; + + dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n", + session->s_mds, ceph_session_state_name(session->s_state), seq); + msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq); + if (!msg) + return -ENOMEM; + ceph_con_send(&session->s_con, msg); + return 0; +} + + +/* + * Note new cap ttl, and any transition from stale -> not stale (fresh?). + * + * Called under session->s_mutex + */ +static void renewed_caps(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session, int is_renew) +{ + int was_stale; + int wake = 0; + + spin_lock(&session->s_cap_lock); + was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); + + session->s_cap_ttl = session->s_renew_requested + + mdsc->mdsmap->m_session_timeout*HZ; + + if (was_stale) { + if (time_before(jiffies, session->s_cap_ttl)) { + pr_info("mds%d caps renewed\n", session->s_mds); + wake = 1; + } else { + pr_info("mds%d caps still stale\n", session->s_mds); + } + } + dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", + session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", + time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); + spin_unlock(&session->s_cap_lock); + + if (wake) + wake_up_session_caps(session, 0); +} + +/* + * send a session close request + */ +static int request_close_session(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_msg *msg; + + dout("request_close_session mds%d state %s seq %lld\n", + session->s_mds, ceph_session_state_name(session->s_state), + session->s_seq); + msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); + if (!msg) + return -ENOMEM; + ceph_con_send(&session->s_con, msg); + return 0; +} + +/* + * Called with s_mutex held. + */ +static int __close_session(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + if (session->s_state >= CEPH_MDS_SESSION_CLOSING) + return 0; + session->s_state = CEPH_MDS_SESSION_CLOSING; + return request_close_session(mdsc, session); +} + +/* + * Trim old(er) caps. + * + * Because we can't cache an inode without one or more caps, we do + * this indirectly: if a cap is unused, we prune its aliases, at which + * point the inode will hopefully get dropped to. + * + * Yes, this is a bit sloppy. Our only real goal here is to respond to + * memory pressure from the MDS, though, so it needn't be perfect. + */ +static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) +{ + struct ceph_mds_session *session = arg; + struct ceph_inode_info *ci = ceph_inode(inode); + int used, wanted, oissued, mine; + + if (session->s_trim_caps <= 0) + return -1; + + spin_lock(&ci->i_ceph_lock); + mine = cap->issued | cap->implemented; + used = __ceph_caps_used(ci); + wanted = __ceph_caps_file_wanted(ci); + oissued = __ceph_caps_issued_other(ci, cap); + + dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n", + inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), + ceph_cap_string(used), ceph_cap_string(wanted)); + if (cap == ci->i_auth_cap) { + if (ci->i_dirty_caps | ci->i_flushing_caps) + goto out; + if ((used | wanted) & CEPH_CAP_ANY_WR) + goto out; + } + if ((used | wanted) & ~oissued & mine) + goto out; /* we need these caps */ + + session->s_trim_caps--; + if (oissued) { + /* we aren't the only cap.. just remove us */ + __ceph_remove_cap(cap, true); + } else { + /* try to drop referring dentries */ + spin_unlock(&ci->i_ceph_lock); + d_prune_aliases(inode); + dout("trim_caps_cb %p cap %p pruned, count now %d\n", + inode, cap, atomic_read(&inode->i_count)); + return 0; + } + +out: + spin_unlock(&ci->i_ceph_lock); + return 0; +} + +/* + * Trim session cap count down to some max number. + */ +static int trim_caps(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session, + int max_caps) +{ + int trim_caps = session->s_nr_caps - max_caps; + + dout("trim_caps mds%d start: %d / %d, trim %d\n", + session->s_mds, session->s_nr_caps, max_caps, trim_caps); + if (trim_caps > 0) { + session->s_trim_caps = trim_caps; + iterate_session_caps(session, trim_caps_cb, session); + dout("trim_caps mds%d done: %d / %d, trimmed %d\n", + session->s_mds, session->s_nr_caps, max_caps, + trim_caps - session->s_trim_caps); + session->s_trim_caps = 0; + } + + ceph_add_cap_releases(mdsc, session); + ceph_send_cap_releases(mdsc, session); + return 0; +} + +/* + * Allocate cap_release messages. If there is a partially full message + * in the queue, try to allocate enough to cover it's remainder, so that + * we can send it immediately. + * + * Called under s_mutex. + */ +int ceph_add_cap_releases(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_msg *msg, *partial = NULL; + struct ceph_mds_cap_release *head; + int err = -ENOMEM; + int extra = mdsc->fsc->mount_options->cap_release_safety; + int num; + + dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds, + extra); + + spin_lock(&session->s_cap_lock); + + if (!list_empty(&session->s_cap_releases)) { + msg = list_first_entry(&session->s_cap_releases, + struct ceph_msg, + list_head); + head = msg->front.iov_base; + num = le32_to_cpu(head->num); + if (num) { + dout(" partial %p with (%d/%d)\n", msg, num, + (int)CEPH_CAPS_PER_RELEASE); + extra += CEPH_CAPS_PER_RELEASE - num; + partial = msg; + } + } + while (session->s_num_cap_releases < session->s_nr_caps + extra) { + spin_unlock(&session->s_cap_lock); + msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE, + GFP_NOFS, false); + if (!msg) + goto out_unlocked; + dout("add_cap_releases %p msg %p now %d\n", session, msg, + (int)msg->front.iov_len); + head = msg->front.iov_base; + head->num = cpu_to_le32(0); + msg->front.iov_len = sizeof(*head); + spin_lock(&session->s_cap_lock); + list_add(&msg->list_head, &session->s_cap_releases); + session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE; + } + + if (partial) { + head = partial->front.iov_base; + num = le32_to_cpu(head->num); + dout(" queueing partial %p with %d/%d\n", partial, num, + (int)CEPH_CAPS_PER_RELEASE); + list_move_tail(&partial->list_head, + &session->s_cap_releases_done); + session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num; + } + err = 0; + spin_unlock(&session->s_cap_lock); +out_unlocked: + return err; +} + +static int check_cap_flush(struct inode *inode, u64 want_flush_seq) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int ret; + spin_lock(&ci->i_ceph_lock); + if (ci->i_flushing_caps) + ret = ci->i_cap_flush_seq >= want_flush_seq; + else + ret = 1; + spin_unlock(&ci->i_ceph_lock); + return ret; +} + +/* + * flush all dirty inode data to disk. + * + * returns true if we've flushed through want_flush_seq + */ +static void wait_caps_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq) +{ + int mds; + + dout("check_cap_flush want %lld\n", want_flush_seq); + mutex_lock(&mdsc->mutex); + for (mds = 0; mds < mdsc->max_sessions; mds++) { + struct ceph_mds_session *session = mdsc->sessions[mds]; + struct inode *inode = NULL; + + if (!session) + continue; + get_session(session); + mutex_unlock(&mdsc->mutex); + + mutex_lock(&session->s_mutex); + if (!list_empty(&session->s_cap_flushing)) { + struct ceph_inode_info *ci = + list_entry(session->s_cap_flushing.next, + struct ceph_inode_info, + i_flushing_item); + + if (!check_cap_flush(&ci->vfs_inode, want_flush_seq)) { + dout("check_cap_flush still flushing %p " + "seq %lld <= %lld to mds%d\n", + &ci->vfs_inode, ci->i_cap_flush_seq, + want_flush_seq, session->s_mds); + inode = igrab(&ci->vfs_inode); + } + } + mutex_unlock(&session->s_mutex); + ceph_put_mds_session(session); + + if (inode) { + wait_event(mdsc->cap_flushing_wq, + check_cap_flush(inode, want_flush_seq)); + iput(inode); + } + + mutex_lock(&mdsc->mutex); + } + + mutex_unlock(&mdsc->mutex); + dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq); +} + +/* + * called under s_mutex + */ +void ceph_send_cap_releases(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_msg *msg; + + dout("send_cap_releases mds%d\n", session->s_mds); + spin_lock(&session->s_cap_lock); + while (!list_empty(&session->s_cap_releases_done)) { + msg = list_first_entry(&session->s_cap_releases_done, + struct ceph_msg, list_head); + list_del_init(&msg->list_head); + spin_unlock(&session->s_cap_lock); + msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); + dout("send_cap_releases mds%d %p\n", session->s_mds, msg); + ceph_con_send(&session->s_con, msg); + spin_lock(&session->s_cap_lock); + } + spin_unlock(&session->s_cap_lock); +} + +static void discard_cap_releases(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_msg *msg; + struct ceph_mds_cap_release *head; + unsigned num; + + dout("discard_cap_releases mds%d\n", session->s_mds); + + if (!list_empty(&session->s_cap_releases)) { + /* zero out the in-progress message */ + msg = list_first_entry(&session->s_cap_releases, + struct ceph_msg, list_head); + head = msg->front.iov_base; + num = le32_to_cpu(head->num); + dout("discard_cap_releases mds%d %p %u\n", + session->s_mds, msg, num); + head->num = cpu_to_le32(0); + msg->front.iov_len = sizeof(*head); + session->s_num_cap_releases += num; + } + + /* requeue completed messages */ + while (!list_empty(&session->s_cap_releases_done)) { + msg = list_first_entry(&session->s_cap_releases_done, + struct ceph_msg, list_head); + list_del_init(&msg->list_head); + + head = msg->front.iov_base; + num = le32_to_cpu(head->num); + dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, + num); + session->s_num_cap_releases += num; + head->num = cpu_to_le32(0); + msg->front.iov_len = sizeof(*head); + list_add(&msg->list_head, &session->s_cap_releases); + } +} + +/* + * requests + */ + +int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, + struct inode *dir) +{ + struct ceph_inode_info *ci = ceph_inode(dir); + struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; + struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options; + size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) + + sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease); + int order, num_entries; + + spin_lock(&ci->i_ceph_lock); + num_entries = ci->i_files + ci->i_subdirs; + spin_unlock(&ci->i_ceph_lock); + num_entries = max(num_entries, 1); + num_entries = min(num_entries, opt->max_readdir); + + order = get_order(size * num_entries); + while (order >= 0) { + rinfo->dir_in = (void*)__get_free_pages(GFP_NOFS | __GFP_NOWARN, + order); + if (rinfo->dir_in) + break; + order--; + } + if (!rinfo->dir_in) + return -ENOMEM; + + num_entries = (PAGE_SIZE << order) / size; + num_entries = min(num_entries, opt->max_readdir); + + rinfo->dir_buf_size = PAGE_SIZE << order; + req->r_num_caps = num_entries + 1; + req->r_args.readdir.max_entries = cpu_to_le32(num_entries); + req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes); + return 0; +} + +/* + * Create an mds request. + */ +struct ceph_mds_request * +ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) +{ + struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); + + if (!req) + return ERR_PTR(-ENOMEM); + + mutex_init(&req->r_fill_mutex); + req->r_mdsc = mdsc; + req->r_started = jiffies; + req->r_resend_mds = -1; + INIT_LIST_HEAD(&req->r_unsafe_dir_item); + req->r_fmode = -1; + kref_init(&req->r_kref); + INIT_LIST_HEAD(&req->r_wait); + init_completion(&req->r_completion); + init_completion(&req->r_safe_completion); + INIT_LIST_HEAD(&req->r_unsafe_item); + + req->r_stamp = CURRENT_TIME; + + req->r_op = op; + req->r_direct_mode = mode; + return req; +} + +/* + * return oldest (lowest) request, tid in request tree, 0 if none. + * + * called under mdsc->mutex. + */ +static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) +{ + if (RB_EMPTY_ROOT(&mdsc->request_tree)) + return NULL; + return rb_entry(rb_first(&mdsc->request_tree), + struct ceph_mds_request, r_node); +} + +static u64 __get_oldest_tid(struct ceph_mds_client *mdsc) +{ + struct ceph_mds_request *req = __get_oldest_req(mdsc); + + if (req) + return req->r_tid; + return 0; +} + +/* + * Build a dentry's path. Allocate on heap; caller must kfree. Based + * on build_path_from_dentry in fs/cifs/dir.c. + * + * If @stop_on_nosnap, generate path relative to the first non-snapped + * inode. + * + * Encode hidden .snap dirs as a double /, i.e. + * foo/.snap/bar -> foo//bar + */ +char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, + int stop_on_nosnap) +{ + struct dentry *temp; + char *path; + int len, pos; + unsigned seq; + + if (dentry == NULL) + return ERR_PTR(-EINVAL); + +retry: + len = 0; + seq = read_seqbegin(&rename_lock); + rcu_read_lock(); + for (temp = dentry; !IS_ROOT(temp);) { + struct inode *inode = d_inode(temp); + if (inode && ceph_snap(inode) == CEPH_SNAPDIR) + len++; /* slash only */ + else if (stop_on_nosnap && inode && + ceph_snap(inode) == CEPH_NOSNAP) + break; + else + len += 1 + temp->d_name.len; + temp = temp->d_parent; + } + rcu_read_unlock(); + if (len) + len--; /* no leading '/' */ + + path = kmalloc(len+1, GFP_NOFS); + if (path == NULL) + return ERR_PTR(-ENOMEM); + pos = len; + path[pos] = 0; /* trailing null */ + rcu_read_lock(); + for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { + struct inode *inode; + + spin_lock(&temp->d_lock); + inode = d_inode(temp); + if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { + dout("build_path path+%d: %p SNAPDIR\n", + pos, temp); + } else if (stop_on_nosnap && inode && + ceph_snap(inode) == CEPH_NOSNAP) { + spin_unlock(&temp->d_lock); + break; + } else { + pos -= temp->d_name.len; + if (pos < 0) { + spin_unlock(&temp->d_lock); + break; + } + strncpy(path + pos, temp->d_name.name, + temp->d_name.len); + } + spin_unlock(&temp->d_lock); + if (pos) + path[--pos] = '/'; + temp = temp->d_parent; + } + rcu_read_unlock(); + if (pos != 0 || read_seqretry(&rename_lock, seq)) { + pr_err("build_path did not end path lookup where " + "expected, namelen is %d, pos is %d\n", len, pos); + /* presumably this is only possible if racing with a + rename of one of the parent directories (we can not + lock the dentries above us to prevent this, but + retrying should be harmless) */ + kfree(path); + goto retry; + } + + *base = ceph_ino(d_inode(temp)); + *plen = len; + dout("build_path on %p %d built %llx '%.*s'\n", + dentry, d_count(dentry), *base, len, path); + return path; +} + +static int build_dentry_path(struct dentry *dentry, + const char **ppath, int *ppathlen, u64 *pino, + int *pfreepath) +{ + char *path; + + if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) { + *pino = ceph_ino(d_inode(dentry->d_parent)); + *ppath = dentry->d_name.name; + *ppathlen = dentry->d_name.len; + return 0; + } + path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); + if (IS_ERR(path)) + return PTR_ERR(path); + *ppath = path; + *pfreepath = 1; + return 0; +} + +static int build_inode_path(struct inode *inode, + const char **ppath, int *ppathlen, u64 *pino, + int *pfreepath) +{ + struct dentry *dentry; + char *path; + + if (ceph_snap(inode) == CEPH_NOSNAP) { + *pino = ceph_ino(inode); + *ppathlen = 0; + return 0; + } + dentry = d_find_alias(inode); + path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); + dput(dentry); + if (IS_ERR(path)) + return PTR_ERR(path); + *ppath = path; + *pfreepath = 1; + return 0; +} + +/* + * request arguments may be specified via an inode *, a dentry *, or + * an explicit ino+path. + */ +static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, + const char *rpath, u64 rino, + const char **ppath, int *pathlen, + u64 *ino, int *freepath) +{ + int r = 0; + + if (rinode) { + r = build_inode_path(rinode, ppath, pathlen, ino, freepath); + dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), + ceph_snap(rinode)); + } else if (rdentry) { + r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); + dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, + *ppath); + } else if (rpath || rino) { + *ino = rino; + *ppath = rpath; + *pathlen = rpath ? strlen(rpath) : 0; + dout(" path %.*s\n", *pathlen, rpath); + } + + return r; +} + +/* + * called under mdsc->mutex + */ +static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req, + int mds, bool drop_cap_releases) +{ + struct ceph_msg *msg; + struct ceph_mds_request_head *head; + const char *path1 = NULL; + const char *path2 = NULL; + u64 ino1 = 0, ino2 = 0; + int pathlen1 = 0, pathlen2 = 0; + int freepath1 = 0, freepath2 = 0; + int len; + u16 releases; + void *p, *end; + int ret; + + ret = set_request_path_attr(req->r_inode, req->r_dentry, + req->r_path1, req->r_ino1.ino, + &path1, &pathlen1, &ino1, &freepath1); + if (ret < 0) { + msg = ERR_PTR(ret); + goto out; + } + + ret = set_request_path_attr(NULL, req->r_old_dentry, + req->r_path2, req->r_ino2.ino, + &path2, &pathlen2, &ino2, &freepath2); + if (ret < 0) { + msg = ERR_PTR(ret); + goto out_free1; + } + + len = sizeof(*head) + + pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) + + sizeof(struct timespec); + + /* calculate (max) length for cap releases */ + len += sizeof(struct ceph_mds_request_release) * + (!!req->r_inode_drop + !!req->r_dentry_drop + + !!req->r_old_inode_drop + !!req->r_old_dentry_drop); + if (req->r_dentry_drop) + len += req->r_dentry->d_name.len; + if (req->r_old_dentry_drop) + len += req->r_old_dentry->d_name.len; + + msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false); + if (!msg) { + msg = ERR_PTR(-ENOMEM); + goto out_free2; + } + + msg->hdr.version = cpu_to_le16(2); + msg->hdr.tid = cpu_to_le64(req->r_tid); + + head = msg->front.iov_base; + p = msg->front.iov_base + sizeof(*head); + end = msg->front.iov_base + msg->front.iov_len; + + head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); + head->op = cpu_to_le32(req->r_op); + head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid)); + head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid)); + head->args = req->r_args; + + ceph_encode_filepath(&p, end, ino1, path1); + ceph_encode_filepath(&p, end, ino2, path2); + + /* make note of release offset, in case we need to replay */ + req->r_request_release_offset = p - msg->front.iov_base; + + /* cap releases */ + releases = 0; + if (req->r_inode_drop) + releases += ceph_encode_inode_release(&p, + req->r_inode ? req->r_inode : d_inode(req->r_dentry), + mds, req->r_inode_drop, req->r_inode_unless, 0); + if (req->r_dentry_drop) + releases += ceph_encode_dentry_release(&p, req->r_dentry, + mds, req->r_dentry_drop, req->r_dentry_unless); + if (req->r_old_dentry_drop) + releases += ceph_encode_dentry_release(&p, req->r_old_dentry, + mds, req->r_old_dentry_drop, req->r_old_dentry_unless); + if (req->r_old_inode_drop) + releases += ceph_encode_inode_release(&p, + d_inode(req->r_old_dentry), + mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); + + if (drop_cap_releases) { + releases = 0; + p = msg->front.iov_base + req->r_request_release_offset; + } + + head->num_releases = cpu_to_le16(releases); + + /* time stamp */ + { + struct ceph_timespec ts; + ceph_encode_timespec(&ts, &req->r_stamp); + ceph_encode_copy(&p, &ts, sizeof(ts)); + } + + BUG_ON(p > end); + msg->front.iov_len = p - msg->front.iov_base; + msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); + + if (req->r_pagelist) { + struct ceph_pagelist *pagelist = req->r_pagelist; + atomic_inc(&pagelist->refcnt); + ceph_msg_data_add_pagelist(msg, pagelist); + msg->hdr.data_len = cpu_to_le32(pagelist->length); + } else { + msg->hdr.data_len = 0; + } + + msg->hdr.data_off = cpu_to_le16(0); + +out_free2: + if (freepath2) + kfree((char *)path2); +out_free1: + if (freepath1) + kfree((char *)path1); +out: + return msg; +} + +/* + * called under mdsc->mutex if error, under no mutex if + * success. + */ +static void complete_request(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req) +{ + if (req->r_callback) + req->r_callback(mdsc, req); + else + complete_all(&req->r_completion); +} + +/* + * called under mdsc->mutex + */ +static int __prepare_send_request(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req, + int mds, bool drop_cap_releases) +{ + struct ceph_mds_request_head *rhead; + struct ceph_msg *msg; + int flags = 0; + + req->r_attempts++; + if (req->r_inode) { + struct ceph_cap *cap = + ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); + + if (cap) + req->r_sent_on_mseq = cap->mseq; + else + req->r_sent_on_mseq = -1; + } + dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, + req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); + + if (req->r_got_unsafe) { + void *p; + /* + * Replay. Do not regenerate message (and rebuild + * paths, etc.); just use the original message. + * Rebuilding paths will break for renames because + * d_move mangles the src name. + */ + msg = req->r_request; + rhead = msg->front.iov_base; + + flags = le32_to_cpu(rhead->flags); + flags |= CEPH_MDS_FLAG_REPLAY; + rhead->flags = cpu_to_le32(flags); + + if (req->r_target_inode) + rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); + + rhead->num_retry = req->r_attempts - 1; + + /* remove cap/dentry releases from message */ + rhead->num_releases = 0; + + /* time stamp */ + p = msg->front.iov_base + req->r_request_release_offset; + { + struct ceph_timespec ts; + ceph_encode_timespec(&ts, &req->r_stamp); + ceph_encode_copy(&p, &ts, sizeof(ts)); + } + + msg->front.iov_len = p - msg->front.iov_base; + msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); + return 0; + } + + if (req->r_request) { + ceph_msg_put(req->r_request); + req->r_request = NULL; + } + msg = create_request_message(mdsc, req, mds, drop_cap_releases); + if (IS_ERR(msg)) { + req->r_err = PTR_ERR(msg); + complete_request(mdsc, req); + return PTR_ERR(msg); + } + req->r_request = msg; + + rhead = msg->front.iov_base; + rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); + if (req->r_got_unsafe) + flags |= CEPH_MDS_FLAG_REPLAY; + if (req->r_locked_dir) + flags |= CEPH_MDS_FLAG_WANT_DENTRY; + rhead->flags = cpu_to_le32(flags); + rhead->num_fwd = req->r_num_fwd; + rhead->num_retry = req->r_attempts - 1; + rhead->ino = 0; + + dout(" r_locked_dir = %p\n", req->r_locked_dir); + return 0; +} + +/* + * send request, or put it on the appropriate wait list. + */ +static int __do_request(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req) +{ + struct ceph_mds_session *session = NULL; + int mds = -1; + int err = -EAGAIN; + + if (req->r_err || req->r_got_result) { + if (req->r_aborted) + __unregister_request(mdsc, req); + goto out; + } + + if (req->r_timeout && + time_after_eq(jiffies, req->r_started + req->r_timeout)) { + dout("do_request timed out\n"); + err = -EIO; + goto finish; + } + + put_request_session(req); + + mds = __choose_mds(mdsc, req); + if (mds < 0 || + ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { + dout("do_request no mds or not active, waiting for map\n"); + list_add(&req->r_wait, &mdsc->waiting_for_map); + goto out; + } + + /* get, open session */ + session = __ceph_lookup_mds_session(mdsc, mds); + if (!session) { + session = register_session(mdsc, mds); + if (IS_ERR(session)) { + err = PTR_ERR(session); + goto finish; + } + } + req->r_session = get_session(session); + + dout("do_request mds%d session %p state %s\n", mds, session, + ceph_session_state_name(session->s_state)); + if (session->s_state != CEPH_MDS_SESSION_OPEN && + session->s_state != CEPH_MDS_SESSION_HUNG) { + if (session->s_state == CEPH_MDS_SESSION_NEW || + session->s_state == CEPH_MDS_SESSION_CLOSING) + __open_session(mdsc, session); + list_add(&req->r_wait, &session->s_waiting); + goto out_session; + } + + /* send request */ + req->r_resend_mds = -1; /* forget any previous mds hint */ + + if (req->r_request_started == 0) /* note request start time */ + req->r_request_started = jiffies; + + err = __prepare_send_request(mdsc, req, mds, false); + if (!err) { + ceph_msg_get(req->r_request); + ceph_con_send(&session->s_con, req->r_request); + } + +out_session: + ceph_put_mds_session(session); +out: + return err; + +finish: + req->r_err = err; + complete_request(mdsc, req); + goto out; +} + +/* + * called under mdsc->mutex + */ +static void __wake_requests(struct ceph_mds_client *mdsc, + struct list_head *head) +{ + struct ceph_mds_request *req; + LIST_HEAD(tmp_list); + + list_splice_init(head, &tmp_list); + + while (!list_empty(&tmp_list)) { + req = list_entry(tmp_list.next, + struct ceph_mds_request, r_wait); + list_del_init(&req->r_wait); + dout(" wake request %p tid %llu\n", req, req->r_tid); + __do_request(mdsc, req); + } +} + +/* + * Wake up threads with requests pending for @mds, so that they can + * resubmit their requests to a possibly different mds. + */ +static void kick_requests(struct ceph_mds_client *mdsc, int mds) +{ + struct ceph_mds_request *req; + struct rb_node *p = rb_first(&mdsc->request_tree); + + dout("kick_requests mds%d\n", mds); + while (p) { + req = rb_entry(p, struct ceph_mds_request, r_node); + p = rb_next(p); + if (req->r_got_unsafe) + continue; + if (req->r_attempts > 0) + continue; /* only new requests */ + if (req->r_session && + req->r_session->s_mds == mds) { + dout(" kicking tid %llu\n", req->r_tid); + list_del_init(&req->r_wait); + __do_request(mdsc, req); + } + } +} + +void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req) +{ + dout("submit_request on %p\n", req); + mutex_lock(&mdsc->mutex); + __register_request(mdsc, req, NULL); + __do_request(mdsc, req); + mutex_unlock(&mdsc->mutex); +} + +/* + * Synchrously perform an mds request. Take care of all of the + * session setup, forwarding, retry details. + */ +int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, + struct inode *dir, + struct ceph_mds_request *req) +{ + int err; + + dout("do_request on %p\n", req); + + /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ + if (req->r_inode) + ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); + if (req->r_locked_dir) + ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); + if (req->r_old_dentry_dir) + ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), + CEPH_CAP_PIN); + + /* issue */ + mutex_lock(&mdsc->mutex); + __register_request(mdsc, req, dir); + __do_request(mdsc, req); + + if (req->r_err) { + err = req->r_err; + __unregister_request(mdsc, req); + dout("do_request early error %d\n", err); + goto out; + } + + /* wait */ + mutex_unlock(&mdsc->mutex); + dout("do_request waiting\n"); + if (req->r_timeout) { + err = (long)wait_for_completion_killable_timeout( + &req->r_completion, req->r_timeout); + if (err == 0) + err = -EIO; + } else if (req->r_wait_for_completion) { + err = req->r_wait_for_completion(mdsc, req); + } else { + err = wait_for_completion_killable(&req->r_completion); + } + dout("do_request waited, got %d\n", err); + mutex_lock(&mdsc->mutex); + + /* only abort if we didn't race with a real reply */ + if (req->r_got_result) { + err = le32_to_cpu(req->r_reply_info.head->result); + } else if (err < 0) { + dout("aborted request %lld with %d\n", req->r_tid, err); + + /* + * ensure we aren't running concurrently with + * ceph_fill_trace or ceph_readdir_prepopulate, which + * rely on locks (dir mutex) held by our caller. + */ + mutex_lock(&req->r_fill_mutex); + req->r_err = err; + req->r_aborted = true; + mutex_unlock(&req->r_fill_mutex); + + if (req->r_locked_dir && + (req->r_op & CEPH_MDS_OP_WRITE)) + ceph_invalidate_dir_request(req); + } else { + err = req->r_err; + } + +out: + mutex_unlock(&mdsc->mutex); + dout("do_request %p done, result %d\n", req, err); + return err; +} + +/* + * Invalidate dir's completeness, dentry lease state on an aborted MDS + * namespace request. + */ +void ceph_invalidate_dir_request(struct ceph_mds_request *req) +{ + struct inode *inode = req->r_locked_dir; + + dout("invalidate_dir_request %p (complete, lease(s))\n", inode); + + ceph_dir_clear_complete(inode); + if (req->r_dentry) + ceph_invalidate_dentry_lease(req->r_dentry); + if (req->r_old_dentry) + ceph_invalidate_dentry_lease(req->r_old_dentry); +} + +/* + * Handle mds reply. + * + * We take the session mutex and parse and process the reply immediately. + * This preserves the logical ordering of replies, capabilities, etc., sent + * by the MDS as they are applied to our local cache. + */ +static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) +{ + struct ceph_mds_client *mdsc = session->s_mdsc; + struct ceph_mds_request *req; + struct ceph_mds_reply_head *head = msg->front.iov_base; + struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ + struct ceph_snap_realm *realm; + u64 tid; + int err, result; + int mds = session->s_mds; + + if (msg->front.iov_len < sizeof(*head)) { + pr_err("mdsc_handle_reply got corrupt (short) reply\n"); + ceph_msg_dump(msg); + return; + } + + /* get request, session */ + tid = le64_to_cpu(msg->hdr.tid); + mutex_lock(&mdsc->mutex); + req = __lookup_request(mdsc, tid); + if (!req) { + dout("handle_reply on unknown tid %llu\n", tid); + mutex_unlock(&mdsc->mutex); + return; + } + dout("handle_reply %p\n", req); + + /* correct session? */ + if (req->r_session != session) { + pr_err("mdsc_handle_reply got %llu on session mds%d" + " not mds%d\n", tid, session->s_mds, + req->r_session ? req->r_session->s_mds : -1); + mutex_unlock(&mdsc->mutex); + goto out; + } + + /* dup? */ + if ((req->r_got_unsafe && !head->safe) || + (req->r_got_safe && head->safe)) { + pr_warn("got a dup %s reply on %llu from mds%d\n", + head->safe ? "safe" : "unsafe", tid, mds); + mutex_unlock(&mdsc->mutex); + goto out; + } + if (req->r_got_safe && !head->safe) { + pr_warn("got unsafe after safe on %llu from mds%d\n", + tid, mds); + mutex_unlock(&mdsc->mutex); + goto out; + } + + result = le32_to_cpu(head->result); + + /* + * Handle an ESTALE + * if we're not talking to the authority, send to them + * if the authority has changed while we weren't looking, + * send to new authority + * Otherwise we just have to return an ESTALE + */ + if (result == -ESTALE) { + dout("got ESTALE on request %llu", req->r_tid); + req->r_resend_mds = -1; + if (req->r_direct_mode != USE_AUTH_MDS) { + dout("not using auth, setting for that now"); + req->r_direct_mode = USE_AUTH_MDS; + __do_request(mdsc, req); + mutex_unlock(&mdsc->mutex); + goto out; + } else { + int mds = __choose_mds(mdsc, req); + if (mds >= 0 && mds != req->r_session->s_mds) { + dout("but auth changed, so resending"); + __do_request(mdsc, req); + mutex_unlock(&mdsc->mutex); + goto out; + } + } + dout("have to return ESTALE on request %llu", req->r_tid); + } + + + if (head->safe) { + req->r_got_safe = true; + __unregister_request(mdsc, req); + + if (req->r_got_unsafe) { + /* + * We already handled the unsafe response, now do the + * cleanup. No need to examine the response; the MDS + * doesn't include any result info in the safe + * response. And even if it did, there is nothing + * useful we could do with a revised return value. + */ + dout("got safe reply %llu, mds%d\n", tid, mds); + list_del_init(&req->r_unsafe_item); + + /* last unsafe request during umount? */ + if (mdsc->stopping && !__get_oldest_req(mdsc)) + complete_all(&mdsc->safe_umount_waiters); + mutex_unlock(&mdsc->mutex); + goto out; + } + } else { + req->r_got_unsafe = true; + list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); + } + + dout("handle_reply tid %lld result %d\n", tid, result); + rinfo = &req->r_reply_info; + err = parse_reply_info(msg, rinfo, session->s_con.peer_features); + mutex_unlock(&mdsc->mutex); + + mutex_lock(&session->s_mutex); + if (err < 0) { + pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); + ceph_msg_dump(msg); + goto out_err; + } + + /* snap trace */ + realm = NULL; + if (rinfo->snapblob_len) { + down_write(&mdsc->snap_rwsem); + ceph_update_snap_trace(mdsc, rinfo->snapblob, + rinfo->snapblob + rinfo->snapblob_len, + le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP, + &realm); + downgrade_write(&mdsc->snap_rwsem); + } else { + down_read(&mdsc->snap_rwsem); + } + + /* insert trace into our cache */ + mutex_lock(&req->r_fill_mutex); + err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session); + if (err == 0) { + if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || + req->r_op == CEPH_MDS_OP_LSSNAP)) + ceph_readdir_prepopulate(req, req->r_session); + ceph_unreserve_caps(mdsc, &req->r_caps_reservation); + } + mutex_unlock(&req->r_fill_mutex); + + up_read(&mdsc->snap_rwsem); + if (realm) + ceph_put_snap_realm(mdsc, realm); +out_err: + mutex_lock(&mdsc->mutex); + if (!req->r_aborted) { + if (err) { + req->r_err = err; + } else { + req->r_reply = msg; + ceph_msg_get(msg); + req->r_got_result = true; + } + } else { + dout("reply arrived after request %lld was aborted\n", tid); + } + mutex_unlock(&mdsc->mutex); + + ceph_add_cap_releases(mdsc, req->r_session); + mutex_unlock(&session->s_mutex); + + /* kick calling process */ + complete_request(mdsc, req); +out: + ceph_mdsc_put_request(req); + return; +} + + + +/* + * handle mds notification that our request has been forwarded. + */ +static void handle_forward(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session, + struct ceph_msg *msg) +{ + struct ceph_mds_request *req; + u64 tid = le64_to_cpu(msg->hdr.tid); + u32 next_mds; + u32 fwd_seq; + int err = -EINVAL; + void *p = msg->front.iov_base; + void *end = p + msg->front.iov_len; + + ceph_decode_need(&p, end, 2*sizeof(u32), bad); + next_mds = ceph_decode_32(&p); + fwd_seq = ceph_decode_32(&p); + + mutex_lock(&mdsc->mutex); + req = __lookup_request(mdsc, tid); + if (!req) { + dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); + goto out; /* dup reply? */ + } + + if (req->r_aborted) { + dout("forward tid %llu aborted, unregistering\n", tid); + __unregister_request(mdsc, req); + } else if (fwd_seq <= req->r_num_fwd) { + dout("forward tid %llu to mds%d - old seq %d <= %d\n", + tid, next_mds, req->r_num_fwd, fwd_seq); + } else { + /* resend. forward race not possible; mds would drop */ + dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); + BUG_ON(req->r_err); + BUG_ON(req->r_got_result); + req->r_attempts = 0; + req->r_num_fwd = fwd_seq; + req->r_resend_mds = next_mds; + put_request_session(req); + __do_request(mdsc, req); + } + ceph_mdsc_put_request(req); +out: + mutex_unlock(&mdsc->mutex); + return; + +bad: + pr_err("mdsc_handle_forward decode error err=%d\n", err); +} + +/* + * handle a mds session control message + */ +static void handle_session(struct ceph_mds_session *session, + struct ceph_msg *msg) +{ + struct ceph_mds_client *mdsc = session->s_mdsc; + u32 op; + u64 seq; + int mds = session->s_mds; + struct ceph_mds_session_head *h = msg->front.iov_base; + int wake = 0; + + /* decode */ + if (msg->front.iov_len != sizeof(*h)) + goto bad; + op = le32_to_cpu(h->op); + seq = le64_to_cpu(h->seq); + + mutex_lock(&mdsc->mutex); + if (op == CEPH_SESSION_CLOSE) + __unregister_session(mdsc, session); + /* FIXME: this ttl calculation is generous */ + session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; + mutex_unlock(&mdsc->mutex); + + mutex_lock(&session->s_mutex); + + dout("handle_session mds%d %s %p state %s seq %llu\n", + mds, ceph_session_op_name(op), session, + ceph_session_state_name(session->s_state), seq); + + if (session->s_state == CEPH_MDS_SESSION_HUNG) { + session->s_state = CEPH_MDS_SESSION_OPEN; + pr_info("mds%d came back\n", session->s_mds); + } + + switch (op) { + case CEPH_SESSION_OPEN: + if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) + pr_info("mds%d reconnect success\n", session->s_mds); + session->s_state = CEPH_MDS_SESSION_OPEN; + renewed_caps(mdsc, session, 0); + wake = 1; + if (mdsc->stopping) + __close_session(mdsc, session); + break; + + case CEPH_SESSION_RENEWCAPS: + if (session->s_renew_seq == seq) + renewed_caps(mdsc, session, 1); + break; + + case CEPH_SESSION_CLOSE: + if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) + pr_info("mds%d reconnect denied\n", session->s_mds); + cleanup_session_requests(mdsc, session); + remove_session_caps(session); + wake = 2; /* for good measure */ + wake_up_all(&mdsc->session_close_wq); + break; + + case CEPH_SESSION_STALE: + pr_info("mds%d caps went stale, renewing\n", + session->s_mds); + spin_lock(&session->s_gen_ttl_lock); + session->s_cap_gen++; + session->s_cap_ttl = jiffies - 1; + spin_unlock(&session->s_gen_ttl_lock); + send_renew_caps(mdsc, session); + break; + + case CEPH_SESSION_RECALL_STATE: + trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); + break; + + case CEPH_SESSION_FLUSHMSG: + send_flushmsg_ack(mdsc, session, seq); + break; + + case CEPH_SESSION_FORCE_RO: + dout("force_session_readonly %p\n", session); + spin_lock(&session->s_cap_lock); + session->s_readonly = true; + spin_unlock(&session->s_cap_lock); + wake_up_session_caps(session, 0); + break; + + default: + pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); + WARN_ON(1); + } + + mutex_unlock(&session->s_mutex); + if (wake) { + mutex_lock(&mdsc->mutex); + __wake_requests(mdsc, &session->s_waiting); + if (wake == 2) + kick_requests(mdsc, mds); + mutex_unlock(&mdsc->mutex); + } + return; + +bad: + pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, + (int)msg->front.iov_len); + ceph_msg_dump(msg); + return; +} + + +/* + * called under session->mutex. + */ +static void replay_unsafe_requests(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_mds_request *req, *nreq; + struct rb_node *p; + int err; + + dout("replay_unsafe_requests mds%d\n", session->s_mds); + + mutex_lock(&mdsc->mutex); + list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { + err = __prepare_send_request(mdsc, req, session->s_mds, true); + if (!err) { + ceph_msg_get(req->r_request); + ceph_con_send(&session->s_con, req->r_request); + } + } + + /* + * also re-send old requests when MDS enters reconnect stage. So that MDS + * can process completed request in clientreplay stage. + */ + p = rb_first(&mdsc->request_tree); + while (p) { + req = rb_entry(p, struct ceph_mds_request, r_node); + p = rb_next(p); + if (req->r_got_unsafe) + continue; + if (req->r_attempts == 0) + continue; /* only old requests */ + if (req->r_session && + req->r_session->s_mds == session->s_mds) { + err = __prepare_send_request(mdsc, req, + session->s_mds, true); + if (!err) { + ceph_msg_get(req->r_request); + ceph_con_send(&session->s_con, req->r_request); + } + } + } + mutex_unlock(&mdsc->mutex); +} + +/* + * Encode information about a cap for a reconnect with the MDS. + */ +static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, + void *arg) +{ + union { + struct ceph_mds_cap_reconnect v2; + struct ceph_mds_cap_reconnect_v1 v1; + } rec; + size_t reclen; + struct ceph_inode_info *ci; + struct ceph_reconnect_state *recon_state = arg; + struct ceph_pagelist *pagelist = recon_state->pagelist; + char *path; + int pathlen, err; + u64 pathbase; + struct dentry *dentry; + + ci = cap->ci; + + dout(" adding %p ino %llx.%llx cap %p %lld %s\n", + inode, ceph_vinop(inode), cap, cap->cap_id, + ceph_cap_string(cap->issued)); + err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); + if (err) + return err; + + dentry = d_find_alias(inode); + if (dentry) { + path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); + if (IS_ERR(path)) { + err = PTR_ERR(path); + goto out_dput; + } + } else { + path = NULL; + pathlen = 0; + } + err = ceph_pagelist_encode_string(pagelist, path, pathlen); + if (err) + goto out_free; + + spin_lock(&ci->i_ceph_lock); + cap->seq = 0; /* reset cap seq */ + cap->issue_seq = 0; /* and issue_seq */ + cap->mseq = 0; /* and migrate_seq */ + cap->cap_gen = cap->session->s_cap_gen; + + if (recon_state->flock) { + rec.v2.cap_id = cpu_to_le64(cap->cap_id); + rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); + rec.v2.issued = cpu_to_le32(cap->issued); + rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); + rec.v2.pathbase = cpu_to_le64(pathbase); + rec.v2.flock_len = 0; + reclen = sizeof(rec.v2); + } else { + rec.v1.cap_id = cpu_to_le64(cap->cap_id); + rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); + rec.v1.issued = cpu_to_le32(cap->issued); + rec.v1.size = cpu_to_le64(inode->i_size); + ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); + ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); + rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); + rec.v1.pathbase = cpu_to_le64(pathbase); + reclen = sizeof(rec.v1); + } + spin_unlock(&ci->i_ceph_lock); + + if (recon_state->flock) { + int num_fcntl_locks, num_flock_locks; + struct ceph_filelock *flocks; + +encode_again: + ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); + flocks = kmalloc((num_fcntl_locks+num_flock_locks) * + sizeof(struct ceph_filelock), GFP_NOFS); + if (!flocks) { + err = -ENOMEM; + goto out_free; + } + err = ceph_encode_locks_to_buffer(inode, flocks, + num_fcntl_locks, + num_flock_locks); + if (err) { + kfree(flocks); + if (err == -ENOSPC) + goto encode_again; + goto out_free; + } + /* + * number of encoded locks is stable, so copy to pagelist + */ + rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) + + (num_fcntl_locks+num_flock_locks) * + sizeof(struct ceph_filelock)); + err = ceph_pagelist_append(pagelist, &rec, reclen); + if (!err) + err = ceph_locks_to_pagelist(flocks, pagelist, + num_fcntl_locks, + num_flock_locks); + kfree(flocks); + } else { + err = ceph_pagelist_append(pagelist, &rec, reclen); + } + + recon_state->nr_caps++; +out_free: + kfree(path); +out_dput: + dput(dentry); + return err; +} + + +/* + * If an MDS fails and recovers, clients need to reconnect in order to + * reestablish shared state. This includes all caps issued through + * this session _and_ the snap_realm hierarchy. Because it's not + * clear which snap realms the mds cares about, we send everything we + * know about.. that ensures we'll then get any new info the + * recovering MDS might have. + * + * This is a relatively heavyweight operation, but it's rare. + * + * called with mdsc->mutex held. + */ +static void send_mds_reconnect(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + struct ceph_msg *reply; + struct rb_node *p; + int mds = session->s_mds; + int err = -ENOMEM; + int s_nr_caps; + struct ceph_pagelist *pagelist; + struct ceph_reconnect_state recon_state; + + pr_info("mds%d reconnect start\n", mds); + + pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); + if (!pagelist) + goto fail_nopagelist; + ceph_pagelist_init(pagelist); + + reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false); + if (!reply) + goto fail_nomsg; + + mutex_lock(&session->s_mutex); + session->s_state = CEPH_MDS_SESSION_RECONNECTING; + session->s_seq = 0; + + dout("session %p state %s\n", session, + ceph_session_state_name(session->s_state)); + + spin_lock(&session->s_gen_ttl_lock); + session->s_cap_gen++; + spin_unlock(&session->s_gen_ttl_lock); + + spin_lock(&session->s_cap_lock); + /* don't know if session is readonly */ + session->s_readonly = 0; + /* + * notify __ceph_remove_cap() that we are composing cap reconnect. + * If a cap get released before being added to the cap reconnect, + * __ceph_remove_cap() should skip queuing cap release. + */ + session->s_cap_reconnect = 1; + /* drop old cap expires; we're about to reestablish that state */ + discard_cap_releases(mdsc, session); + spin_unlock(&session->s_cap_lock); + + /* trim unused caps to reduce MDS's cache rejoin time */ + if (mdsc->fsc->sb->s_root) + shrink_dcache_parent(mdsc->fsc->sb->s_root); + + ceph_con_close(&session->s_con); + ceph_con_open(&session->s_con, + CEPH_ENTITY_TYPE_MDS, mds, + ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); + + /* replay unsafe requests */ + replay_unsafe_requests(mdsc, session); + + down_read(&mdsc->snap_rwsem); + + /* traverse this session's caps */ + s_nr_caps = session->s_nr_caps; + err = ceph_pagelist_encode_32(pagelist, s_nr_caps); + if (err) + goto fail; + + recon_state.nr_caps = 0; + recon_state.pagelist = pagelist; + recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK; + err = iterate_session_caps(session, encode_caps_cb, &recon_state); + if (err < 0) + goto fail; + + spin_lock(&session->s_cap_lock); + session->s_cap_reconnect = 0; + spin_unlock(&session->s_cap_lock); + + /* + * snaprealms. we provide mds with the ino, seq (version), and + * parent for all of our realms. If the mds has any newer info, + * it will tell us. + */ + for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { + struct ceph_snap_realm *realm = + rb_entry(p, struct ceph_snap_realm, node); + struct ceph_mds_snaprealm_reconnect sr_rec; + + dout(" adding snap realm %llx seq %lld parent %llx\n", + realm->ino, realm->seq, realm->parent_ino); + sr_rec.ino = cpu_to_le64(realm->ino); + sr_rec.seq = cpu_to_le64(realm->seq); + sr_rec.parent = cpu_to_le64(realm->parent_ino); + err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); + if (err) + goto fail; + } + + if (recon_state.flock) + reply->hdr.version = cpu_to_le16(2); + + /* raced with cap release? */ + if (s_nr_caps != recon_state.nr_caps) { + struct page *page = list_first_entry(&pagelist->head, + struct page, lru); + __le32 *addr = kmap_atomic(page); + *addr = cpu_to_le32(recon_state.nr_caps); + kunmap_atomic(addr); + } + + reply->hdr.data_len = cpu_to_le32(pagelist->length); + ceph_msg_data_add_pagelist(reply, pagelist); + ceph_con_send(&session->s_con, reply); + + mutex_unlock(&session->s_mutex); + + mutex_lock(&mdsc->mutex); + __wake_requests(mdsc, &session->s_waiting); + mutex_unlock(&mdsc->mutex); + + up_read(&mdsc->snap_rwsem); + return; + +fail: + ceph_msg_put(reply); + up_read(&mdsc->snap_rwsem); + mutex_unlock(&session->s_mutex); +fail_nomsg: + ceph_pagelist_release(pagelist); +fail_nopagelist: + pr_err("error %d preparing reconnect for mds%d\n", err, mds); + return; +} + + +/* + * compare old and new mdsmaps, kicking requests + * and closing out old connections as necessary + * + * called under mdsc->mutex. + */ +static void check_new_map(struct ceph_mds_client *mdsc, + struct ceph_mdsmap *newmap, + struct ceph_mdsmap *oldmap) +{ + int i; + int oldstate, newstate; + struct ceph_mds_session *s; + + dout("check_new_map new %u old %u\n", + newmap->m_epoch, oldmap->m_epoch); + + for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { + if (mdsc->sessions[i] == NULL) + continue; + s = mdsc->sessions[i]; + oldstate = ceph_mdsmap_get_state(oldmap, i); + newstate = ceph_mdsmap_get_state(newmap, i); + + dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", + i, ceph_mds_state_name(oldstate), + ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", + ceph_mds_state_name(newstate), + ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", + ceph_session_state_name(s->s_state)); + + if (i >= newmap->m_max_mds || + memcmp(ceph_mdsmap_get_addr(oldmap, i), + ceph_mdsmap_get_addr(newmap, i), + sizeof(struct ceph_entity_addr))) { + if (s->s_state == CEPH_MDS_SESSION_OPENING) { + /* the session never opened, just close it + * out now */ + __wake_requests(mdsc, &s->s_waiting); + __unregister_session(mdsc, s); + } else { + /* just close it */ + mutex_unlock(&mdsc->mutex); + mutex_lock(&s->s_mutex); + mutex_lock(&mdsc->mutex); + ceph_con_close(&s->s_con); + mutex_unlock(&s->s_mutex); + s->s_state = CEPH_MDS_SESSION_RESTARTING; + } + } else if (oldstate == newstate) { + continue; /* nothing new with this mds */ + } + + /* + * send reconnect? + */ + if (s->s_state == CEPH_MDS_SESSION_RESTARTING && + newstate >= CEPH_MDS_STATE_RECONNECT) { + mutex_unlock(&mdsc->mutex); + send_mds_reconnect(mdsc, s); + mutex_lock(&mdsc->mutex); + } + + /* + * kick request on any mds that has gone active. + */ + if (oldstate < CEPH_MDS_STATE_ACTIVE && + newstate >= CEPH_MDS_STATE_ACTIVE) { + if (oldstate != CEPH_MDS_STATE_CREATING && + oldstate != CEPH_MDS_STATE_STARTING) + pr_info("mds%d recovery completed\n", s->s_mds); + kick_requests(mdsc, i); + ceph_kick_flushing_caps(mdsc, s); + wake_up_session_caps(s, 1); + } + } + + for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) { + s = mdsc->sessions[i]; + if (!s) + continue; + if (!ceph_mdsmap_is_laggy(newmap, i)) + continue; + if (s->s_state == CEPH_MDS_SESSION_OPEN || + s->s_state == CEPH_MDS_SESSION_HUNG || + s->s_state == CEPH_MDS_SESSION_CLOSING) { + dout(" connecting to export targets of laggy mds%d\n", + i); + __open_export_target_sessions(mdsc, s); + } + } +} + + + +/* + * leases + */ + +/* + * caller must hold session s_mutex, dentry->d_lock + */ +void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) +{ + struct ceph_dentry_info *di = ceph_dentry(dentry); + + ceph_put_mds_session(di->lease_session); + di->lease_session = NULL; +} + +static void handle_lease(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session, + struct ceph_msg *msg) +{ + struct super_block *sb = mdsc->fsc->sb; + struct inode *inode; + struct dentry *parent, *dentry; + struct ceph_dentry_info *di; + int mds = session->s_mds; + struct ceph_mds_lease *h = msg->front.iov_base; + u32 seq; + struct ceph_vino vino; + struct qstr dname; + int release = 0; + + dout("handle_lease from mds%d\n", mds); + + /* decode */ + if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) + goto bad; + vino.ino = le64_to_cpu(h->ino); + vino.snap = CEPH_NOSNAP; + seq = le32_to_cpu(h->seq); + dname.name = (void *)h + sizeof(*h) + sizeof(u32); + dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); + if (dname.len != get_unaligned_le32(h+1)) + goto bad; + + /* lookup inode */ + inode = ceph_find_inode(sb, vino); + dout("handle_lease %s, ino %llx %p %.*s\n", + ceph_lease_op_name(h->action), vino.ino, inode, + dname.len, dname.name); + + mutex_lock(&session->s_mutex); + session->s_seq++; + + if (inode == NULL) { + dout("handle_lease no inode %llx\n", vino.ino); + goto release; + } + + /* dentry */ + parent = d_find_alias(inode); + if (!parent) { + dout("no parent dentry on inode %p\n", inode); + WARN_ON(1); + goto release; /* hrm... */ + } + dname.hash = full_name_hash(dname.name, dname.len); + dentry = d_lookup(parent, &dname); + dput(parent); + if (!dentry) + goto release; + + spin_lock(&dentry->d_lock); + di = ceph_dentry(dentry); + switch (h->action) { + case CEPH_MDS_LEASE_REVOKE: + if (di->lease_session == session) { + if (ceph_seq_cmp(di->lease_seq, seq) > 0) + h->seq = cpu_to_le32(di->lease_seq); + __ceph_mdsc_drop_dentry_lease(dentry); + } + release = 1; + break; + + case CEPH_MDS_LEASE_RENEW: + if (di->lease_session == session && + di->lease_gen == session->s_cap_gen && + di->lease_renew_from && + di->lease_renew_after == 0) { + unsigned long duration = + msecs_to_jiffies(le32_to_cpu(h->duration_ms)); + + di->lease_seq = seq; + dentry->d_time = di->lease_renew_from + duration; + di->lease_renew_after = di->lease_renew_from + + (duration >> 1); + di->lease_renew_from = 0; + } + break; + } + spin_unlock(&dentry->d_lock); + dput(dentry); + + if (!release) + goto out; + +release: + /* let's just reuse the same message */ + h->action = CEPH_MDS_LEASE_REVOKE_ACK; + ceph_msg_get(msg); + ceph_con_send(&session->s_con, msg); + +out: + iput(inode); + mutex_unlock(&session->s_mutex); + return; + +bad: + pr_err("corrupt lease message\n"); + ceph_msg_dump(msg); +} + +void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, + struct inode *inode, + struct dentry *dentry, char action, + u32 seq) +{ + struct ceph_msg *msg; + struct ceph_mds_lease *lease; + int len = sizeof(*lease) + sizeof(u32); + int dnamelen = 0; + + dout("lease_send_msg inode %p dentry %p %s to mds%d\n", + inode, dentry, ceph_lease_op_name(action), session->s_mds); + dnamelen = dentry->d_name.len; + len += dnamelen; + + msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); + if (!msg) + return; + lease = msg->front.iov_base; + lease->action = action; + lease->ino = cpu_to_le64(ceph_vino(inode).ino); + lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); + lease->seq = cpu_to_le32(seq); + put_unaligned_le32(dnamelen, lease + 1); + memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); + + /* + * if this is a preemptive lease RELEASE, no need to + * flush request stream, since the actual request will + * soon follow. + */ + msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); + + ceph_con_send(&session->s_con, msg); +} + +/* + * Preemptively release a lease we expect to invalidate anyway. + * Pass @inode always, @dentry is optional. + */ +void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode, + struct dentry *dentry) +{ + struct ceph_dentry_info *di; + struct ceph_mds_session *session; + u32 seq; + + BUG_ON(inode == NULL); + BUG_ON(dentry == NULL); + + /* is dentry lease valid? */ + spin_lock(&dentry->d_lock); + di = ceph_dentry(dentry); + if (!di || !di->lease_session || + di->lease_session->s_mds < 0 || + di->lease_gen != di->lease_session->s_cap_gen || + !time_before(jiffies, dentry->d_time)) { + dout("lease_release inode %p dentry %p -- " + "no lease\n", + inode, dentry); + spin_unlock(&dentry->d_lock); + return; + } + + /* we do have a lease on this dentry; note mds and seq */ + session = ceph_get_mds_session(di->lease_session); + seq = di->lease_seq; + __ceph_mdsc_drop_dentry_lease(dentry); + spin_unlock(&dentry->d_lock); + + dout("lease_release inode %p dentry %p to mds%d\n", + inode, dentry, session->s_mds); + ceph_mdsc_lease_send_msg(session, inode, dentry, + CEPH_MDS_LEASE_RELEASE, seq); + ceph_put_mds_session(session); +} + +/* + * drop all leases (and dentry refs) in preparation for umount + */ +static void drop_leases(struct ceph_mds_client *mdsc) +{ + int i; + + dout("drop_leases\n"); + mutex_lock(&mdsc->mutex); + for (i = 0; i < mdsc->max_sessions; i++) { + struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); + if (!s) + continue; + mutex_unlock(&mdsc->mutex); + mutex_lock(&s->s_mutex); + mutex_unlock(&s->s_mutex); + ceph_put_mds_session(s); + mutex_lock(&mdsc->mutex); + } + mutex_unlock(&mdsc->mutex); +} + + + +/* + * delayed work -- periodically trim expired leases, renew caps with mds + */ +static void schedule_delayed(struct ceph_mds_client *mdsc) +{ + int delay = 5; + unsigned hz = round_jiffies_relative(HZ * delay); + schedule_delayed_work(&mdsc->delayed_work, hz); +} + +static void delayed_work(struct work_struct *work) +{ + int i; + struct ceph_mds_client *mdsc = + container_of(work, struct ceph_mds_client, delayed_work.work); + int renew_interval; + int renew_caps; + + dout("mdsc delayed_work\n"); + ceph_check_delayed_caps(mdsc); + + mutex_lock(&mdsc->mutex); + renew_interval = mdsc->mdsmap->m_session_timeout >> 2; + renew_caps = time_after_eq(jiffies, HZ*renew_interval + + mdsc->last_renew_caps); + if (renew_caps) + mdsc->last_renew_caps = jiffies; + + for (i = 0; i < mdsc->max_sessions; i++) { + struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); + if (s == NULL) + continue; + if (s->s_state == CEPH_MDS_SESSION_CLOSING) { + dout("resending session close request for mds%d\n", + s->s_mds); + request_close_session(mdsc, s); + ceph_put_mds_session(s); + continue; + } + if (s->s_ttl && time_after(jiffies, s->s_ttl)) { + if (s->s_state == CEPH_MDS_SESSION_OPEN) { + s->s_state = CEPH_MDS_SESSION_HUNG; + pr_info("mds%d hung\n", s->s_mds); + } + } + if (s->s_state < CEPH_MDS_SESSION_OPEN) { + /* this mds is failed or recovering, just wait */ + ceph_put_mds_session(s); + continue; + } + mutex_unlock(&mdsc->mutex); + + mutex_lock(&s->s_mutex); + if (renew_caps) + send_renew_caps(mdsc, s); + else + ceph_con_keepalive(&s->s_con); + ceph_add_cap_releases(mdsc, s); + if (s->s_state == CEPH_MDS_SESSION_OPEN || + s->s_state == CEPH_MDS_SESSION_HUNG) + ceph_send_cap_releases(mdsc, s); + mutex_unlock(&s->s_mutex); + ceph_put_mds_session(s); + + mutex_lock(&mdsc->mutex); + } + mutex_unlock(&mdsc->mutex); + + schedule_delayed(mdsc); +} + +int ceph_mdsc_init(struct ceph_fs_client *fsc) + +{ + struct ceph_mds_client *mdsc; + + mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); + if (!mdsc) + return -ENOMEM; + mdsc->fsc = fsc; + fsc->mdsc = mdsc; + mutex_init(&mdsc->mutex); + mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); + if (mdsc->mdsmap == NULL) { + kfree(mdsc); + return -ENOMEM; + } + + init_completion(&mdsc->safe_umount_waiters); + init_waitqueue_head(&mdsc->session_close_wq); + INIT_LIST_HEAD(&mdsc->waiting_for_map); + mdsc->sessions = NULL; + atomic_set(&mdsc->num_sessions, 0); + mdsc->max_sessions = 0; + mdsc->stopping = 0; + init_rwsem(&mdsc->snap_rwsem); + mdsc->snap_realms = RB_ROOT; + INIT_LIST_HEAD(&mdsc->snap_empty); + spin_lock_init(&mdsc->snap_empty_lock); + mdsc->last_tid = 0; + mdsc->request_tree = RB_ROOT; + INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); + mdsc->last_renew_caps = jiffies; + INIT_LIST_HEAD(&mdsc->cap_delay_list); + spin_lock_init(&mdsc->cap_delay_lock); + INIT_LIST_HEAD(&mdsc->snap_flush_list); + spin_lock_init(&mdsc->snap_flush_lock); + mdsc->cap_flush_seq = 0; + INIT_LIST_HEAD(&mdsc->cap_dirty); + INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); + mdsc->num_cap_flushing = 0; + spin_lock_init(&mdsc->cap_dirty_lock); + init_waitqueue_head(&mdsc->cap_flushing_wq); + spin_lock_init(&mdsc->dentry_lru_lock); + INIT_LIST_HEAD(&mdsc->dentry_lru); + + ceph_caps_init(mdsc); + ceph_adjust_min_caps(mdsc, fsc->min_caps); + + return 0; +} + +/* + * Wait for safe replies on open mds requests. If we time out, drop + * all requests from the tree to avoid dangling dentry refs. + */ +static void wait_requests(struct ceph_mds_client *mdsc) +{ + struct ceph_mds_request *req; + struct ceph_fs_client *fsc = mdsc->fsc; + + mutex_lock(&mdsc->mutex); + if (__get_oldest_req(mdsc)) { + mutex_unlock(&mdsc->mutex); + + dout("wait_requests waiting for requests\n"); + wait_for_completion_timeout(&mdsc->safe_umount_waiters, + fsc->client->options->mount_timeout * HZ); + + /* tear down remaining requests */ + mutex_lock(&mdsc->mutex); + while ((req = __get_oldest_req(mdsc))) { + dout("wait_requests timed out on tid %llu\n", + req->r_tid); + __unregister_request(mdsc, req); + } + } + mutex_unlock(&mdsc->mutex); + dout("wait_requests done\n"); +} + +/* + * called before mount is ro, and before dentries are torn down. + * (hmm, does this still race with new lookups?) + */ +void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) +{ + dout("pre_umount\n"); + mdsc->stopping = 1; + + drop_leases(mdsc); + ceph_flush_dirty_caps(mdsc); + wait_requests(mdsc); + + /* + * wait for reply handlers to drop their request refs and + * their inode/dcache refs + */ + ceph_msgr_flush(); +} + +/* + * wait for all write mds requests to flush. + */ +static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) +{ + struct ceph_mds_request *req = NULL, *nextreq; + struct rb_node *n; + + mutex_lock(&mdsc->mutex); + dout("wait_unsafe_requests want %lld\n", want_tid); +restart: + req = __get_oldest_req(mdsc); + while (req && req->r_tid <= want_tid) { + /* find next request */ + n = rb_next(&req->r_node); + if (n) + nextreq = rb_entry(n, struct ceph_mds_request, r_node); + else + nextreq = NULL; + if ((req->r_op & CEPH_MDS_OP_WRITE)) { + /* write op */ + ceph_mdsc_get_request(req); + if (nextreq) + ceph_mdsc_get_request(nextreq); + mutex_unlock(&mdsc->mutex); + dout("wait_unsafe_requests wait on %llu (want %llu)\n", + req->r_tid, want_tid); + wait_for_completion(&req->r_safe_completion); + mutex_lock(&mdsc->mutex); + ceph_mdsc_put_request(req); + if (!nextreq) + break; /* next dne before, so we're done! */ + if (RB_EMPTY_NODE(&nextreq->r_node)) { + /* next request was removed from tree */ + ceph_mdsc_put_request(nextreq); + goto restart; + } + ceph_mdsc_put_request(nextreq); /* won't go away */ + } + req = nextreq; + } + mutex_unlock(&mdsc->mutex); + dout("wait_unsafe_requests done\n"); +} + +void ceph_mdsc_sync(struct ceph_mds_client *mdsc) +{ + u64 want_tid, want_flush; + + if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) + return; + + dout("sync\n"); + mutex_lock(&mdsc->mutex); + want_tid = mdsc->last_tid; + mutex_unlock(&mdsc->mutex); + + ceph_flush_dirty_caps(mdsc); + spin_lock(&mdsc->cap_dirty_lock); + want_flush = mdsc->cap_flush_seq; + spin_unlock(&mdsc->cap_dirty_lock); + + dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush); + + wait_unsafe_requests(mdsc, want_tid); + wait_caps_flush(mdsc, want_flush); +} + +/* + * true if all sessions are closed, or we force unmount + */ +static bool done_closing_sessions(struct ceph_mds_client *mdsc) +{ + if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) + return true; + return atomic_read(&mdsc->num_sessions) == 0; +} + +/* + * called after sb is ro. + */ +void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) +{ + struct ceph_mds_session *session; + int i; + struct ceph_fs_client *fsc = mdsc->fsc; + unsigned long timeout = fsc->client->options->mount_timeout * HZ; + + dout("close_sessions\n"); + + /* close sessions */ + mutex_lock(&mdsc->mutex); + for (i = 0; i < mdsc->max_sessions; i++) { + session = __ceph_lookup_mds_session(mdsc, i); + if (!session) + continue; + mutex_unlock(&mdsc->mutex); + mutex_lock(&session->s_mutex); + __close_session(mdsc, session); + mutex_unlock(&session->s_mutex); + ceph_put_mds_session(session); + mutex_lock(&mdsc->mutex); + } + mutex_unlock(&mdsc->mutex); + + dout("waiting for sessions to close\n"); + wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc), + timeout); + + /* tear down remaining sessions */ + mutex_lock(&mdsc->mutex); + for (i = 0; i < mdsc->max_sessions; i++) { + if (mdsc->sessions[i]) { + session = get_session(mdsc->sessions[i]); + __unregister_session(mdsc, session); + mutex_unlock(&mdsc->mutex); + mutex_lock(&session->s_mutex); + remove_session_caps(session); + mutex_unlock(&session->s_mutex); + ceph_put_mds_session(session); + mutex_lock(&mdsc->mutex); + } + } + WARN_ON(!list_empty(&mdsc->cap_delay_list)); + mutex_unlock(&mdsc->mutex); + + ceph_cleanup_empty_realms(mdsc); + + cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ + + dout("stopped\n"); +} + +static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) +{ + dout("stop\n"); + cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ + if (mdsc->mdsmap) + ceph_mdsmap_destroy(mdsc->mdsmap); + kfree(mdsc->sessions); + ceph_caps_finalize(mdsc); +} + +void ceph_mdsc_destroy(struct ceph_fs_client *fsc) +{ + struct ceph_mds_client *mdsc = fsc->mdsc; + + dout("mdsc_destroy %p\n", mdsc); + ceph_mdsc_stop(mdsc); + + /* flush out any connection work with references to us */ + ceph_msgr_flush(); + + fsc->mdsc = NULL; + kfree(mdsc); + dout("mdsc_destroy %p done\n", mdsc); +} + + +/* + * handle mds map update. + */ +void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg) +{ + u32 epoch; + u32 maplen; + void *p = msg->front.iov_base; + void *end = p + msg->front.iov_len; + struct ceph_mdsmap *newmap, *oldmap; + struct ceph_fsid fsid; + int err = -EINVAL; + + ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); + ceph_decode_copy(&p, &fsid, sizeof(fsid)); + if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) + return; + epoch = ceph_decode_32(&p); + maplen = ceph_decode_32(&p); + dout("handle_map epoch %u len %d\n", epoch, (int)maplen); + + /* do we need it? */ + ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch); + mutex_lock(&mdsc->mutex); + if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { + dout("handle_map epoch %u <= our %u\n", + epoch, mdsc->mdsmap->m_epoch); + mutex_unlock(&mdsc->mutex); + return; + } + + newmap = ceph_mdsmap_decode(&p, end); + if (IS_ERR(newmap)) { + err = PTR_ERR(newmap); + goto bad_unlock; + } + + /* swap into place */ + if (mdsc->mdsmap) { + oldmap = mdsc->mdsmap; + mdsc->mdsmap = newmap; + check_new_map(mdsc, newmap, oldmap); + ceph_mdsmap_destroy(oldmap); + } else { + mdsc->mdsmap = newmap; /* first mds map */ + } + mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; + + __wake_requests(mdsc, &mdsc->waiting_for_map); + + mutex_unlock(&mdsc->mutex); + schedule_delayed(mdsc); + return; + +bad_unlock: + mutex_unlock(&mdsc->mutex); +bad: + pr_err("error decoding mdsmap %d\n", err); + return; +} + +static struct ceph_connection *con_get(struct ceph_connection *con) +{ + struct ceph_mds_session *s = con->private; + + if (get_session(s)) { + dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref)); + return con; + } + dout("mdsc con_get %p FAIL\n", s); + return NULL; +} + +static void con_put(struct ceph_connection *con) +{ + struct ceph_mds_session *s = con->private; + + dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1); + ceph_put_mds_session(s); +} + +/* + * if the client is unresponsive for long enough, the mds will kill + * the session entirely. + */ +static void peer_reset(struct ceph_connection *con) +{ + struct ceph_mds_session *s = con->private; + struct ceph_mds_client *mdsc = s->s_mdsc; + + pr_warn("mds%d closed our session\n", s->s_mds); + send_mds_reconnect(mdsc, s); +} + +static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) +{ + struct ceph_mds_session *s = con->private; + struct ceph_mds_client *mdsc = s->s_mdsc; + int type = le16_to_cpu(msg->hdr.type); + + mutex_lock(&mdsc->mutex); + if (__verify_registered_session(mdsc, s) < 0) { + mutex_unlock(&mdsc->mutex); + goto out; + } + mutex_unlock(&mdsc->mutex); + + switch (type) { + case CEPH_MSG_MDS_MAP: + ceph_mdsc_handle_map(mdsc, msg); + break; + case CEPH_MSG_CLIENT_SESSION: + handle_session(s, msg); + break; + case CEPH_MSG_CLIENT_REPLY: + handle_reply(s, msg); + break; + case CEPH_MSG_CLIENT_REQUEST_FORWARD: + handle_forward(mdsc, s, msg); + break; + case CEPH_MSG_CLIENT_CAPS: + ceph_handle_caps(s, msg); + break; + case CEPH_MSG_CLIENT_SNAP: + ceph_handle_snap(mdsc, s, msg); + break; + case CEPH_MSG_CLIENT_LEASE: + handle_lease(mdsc, s, msg); + break; + + default: + pr_err("received unknown message type %d %s\n", type, + ceph_msg_type_name(type)); + } +out: + ceph_msg_put(msg); +} + +/* + * authentication + */ + +/* + * Note: returned pointer is the address of a structure that's + * managed separately. Caller must *not* attempt to free it. + */ +static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con, + int *proto, int force_new) +{ + struct ceph_mds_session *s = con->private; + struct ceph_mds_client *mdsc = s->s_mdsc; + struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; + struct ceph_auth_handshake *auth = &s->s_auth; + + if (force_new && auth->authorizer) { + ceph_auth_destroy_authorizer(ac, auth->authorizer); + auth->authorizer = NULL; + } + if (!auth->authorizer) { + int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS, + auth); + if (ret) + return ERR_PTR(ret); + } else { + int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS, + auth); + if (ret) + return ERR_PTR(ret); + } + *proto = ac->protocol; + + return auth; +} + + +static int verify_authorizer_reply(struct ceph_connection *con, int len) +{ + struct ceph_mds_session *s = con->private; + struct ceph_mds_client *mdsc = s->s_mdsc; + struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; + + return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len); +} + +static int invalidate_authorizer(struct ceph_connection *con) +{ + struct ceph_mds_session *s = con->private; + struct ceph_mds_client *mdsc = s->s_mdsc; + struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; + + ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); + + return ceph_monc_validate_auth(&mdsc->fsc->client->monc); +} + +static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, + struct ceph_msg_header *hdr, int *skip) +{ + struct ceph_msg *msg; + int type = (int) le16_to_cpu(hdr->type); + int front_len = (int) le32_to_cpu(hdr->front_len); + + if (con->in_msg) + return con->in_msg; + + *skip = 0; + msg = ceph_msg_new(type, front_len, GFP_NOFS, false); + if (!msg) { + pr_err("unable to allocate msg type %d len %d\n", + type, front_len); + return NULL; + } + + return msg; +} + +static int sign_message(struct ceph_connection *con, struct ceph_msg *msg) +{ + struct ceph_mds_session *s = con->private; + struct ceph_auth_handshake *auth = &s->s_auth; + return ceph_auth_sign_message(auth, msg); +} + +static int check_message_signature(struct ceph_connection *con, struct ceph_msg *msg) +{ + struct ceph_mds_session *s = con->private; + struct ceph_auth_handshake *auth = &s->s_auth; + return ceph_auth_check_message_signature(auth, msg); +} + +static const struct ceph_connection_operations mds_con_ops = { + .get = con_get, + .put = con_put, + .dispatch = dispatch, + .get_authorizer = get_authorizer, + .verify_authorizer_reply = verify_authorizer_reply, + .invalidate_authorizer = invalidate_authorizer, + .peer_reset = peer_reset, + .alloc_msg = mds_alloc_msg, + .sign_message = sign_message, + .check_message_signature = check_message_signature, +}; + +/* eof */ diff --git a/kernel/fs/ceph/mds_client.h b/kernel/fs/ceph/mds_client.h new file mode 100644 index 000000000..1875b5d98 --- /dev/null +++ b/kernel/fs/ceph/mds_client.h @@ -0,0 +1,406 @@ +#ifndef _FS_CEPH_MDS_CLIENT_H +#define _FS_CEPH_MDS_CLIENT_H + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +/* + * Some lock dependencies: + * + * session->s_mutex + * mdsc->mutex + * + * mdsc->snap_rwsem + * + * ci->i_ceph_lock + * mdsc->snap_flush_lock + * mdsc->cap_delay_lock + * + */ + +struct ceph_fs_client; +struct ceph_cap; + +/* + * parsed info about a single inode. pointers are into the encoded + * on-wire structures within the mds reply message payload. + */ +struct ceph_mds_reply_info_in { + struct ceph_mds_reply_inode *in; + struct ceph_dir_layout dir_layout; + u32 symlink_len; + char *symlink; + u32 xattr_len; + char *xattr_data; + u64 inline_version; + u32 inline_len; + char *inline_data; +}; + +/* + * parsed info about an mds reply, including information about + * either: 1) the target inode and/or its parent directory and dentry, + * and directory contents (for readdir results), or + * 2) the file range lock info (for fcntl F_GETLK results). + */ +struct ceph_mds_reply_info_parsed { + struct ceph_mds_reply_head *head; + + /* trace */ + struct ceph_mds_reply_info_in diri, targeti; + struct ceph_mds_reply_dirfrag *dirfrag; + char *dname; + u32 dname_len; + struct ceph_mds_reply_lease *dlease; + + /* extra */ + union { + /* for fcntl F_GETLK results */ + struct ceph_filelock *filelock_reply; + + /* for readdir results */ + struct { + struct ceph_mds_reply_dirfrag *dir_dir; + size_t dir_buf_size; + int dir_nr; + char **dir_dname; + u32 *dir_dname_len; + struct ceph_mds_reply_lease **dir_dlease; + struct ceph_mds_reply_info_in *dir_in; + u8 dir_complete, dir_end; + }; + + /* for create results */ + struct { + bool has_create_ino; + u64 ino; + }; + }; + + /* encoded blob describing snapshot contexts for certain + operations (e.g., open) */ + void *snapblob; + int snapblob_len; +}; + + +/* + * cap releases are batched and sent to the MDS en masse. + */ +#define CEPH_CAPS_PER_RELEASE ((PAGE_CACHE_SIZE - \ + sizeof(struct ceph_mds_cap_release)) / \ + sizeof(struct ceph_mds_cap_item)) + + +/* + * state associated with each MDS<->client session + */ +enum { + CEPH_MDS_SESSION_NEW = 1, + CEPH_MDS_SESSION_OPENING = 2, + CEPH_MDS_SESSION_OPEN = 3, + CEPH_MDS_SESSION_HUNG = 4, + CEPH_MDS_SESSION_CLOSING = 5, + CEPH_MDS_SESSION_RESTARTING = 6, + CEPH_MDS_SESSION_RECONNECTING = 7, +}; + +struct ceph_mds_session { + struct ceph_mds_client *s_mdsc; + int s_mds; + int s_state; + unsigned long s_ttl; /* time until mds kills us */ + u64 s_seq; /* incoming msg seq # */ + struct mutex s_mutex; /* serialize session messages */ + + struct ceph_connection s_con; + + struct ceph_auth_handshake s_auth; + + /* protected by s_gen_ttl_lock */ + spinlock_t s_gen_ttl_lock; + u32 s_cap_gen; /* inc each time we get mds stale msg */ + unsigned long s_cap_ttl; /* when session caps expire */ + + /* protected by s_cap_lock */ + spinlock_t s_cap_lock; + struct list_head s_caps; /* all caps issued by this session */ + int s_nr_caps, s_trim_caps; + int s_num_cap_releases; + int s_cap_reconnect; + int s_readonly; + struct list_head s_cap_releases; /* waiting cap_release messages */ + struct list_head s_cap_releases_done; /* ready to send */ + struct ceph_cap *s_cap_iterator; + + /* protected by mutex */ + struct list_head s_cap_flushing; /* inodes w/ flushing caps */ + struct list_head s_cap_snaps_flushing; + unsigned long s_renew_requested; /* last time we sent a renew req */ + u64 s_renew_seq; + + atomic_t s_ref; + struct list_head s_waiting; /* waiting requests */ + struct list_head s_unsafe; /* unsafe requests */ +}; + +/* + * modes of choosing which MDS to send a request to + */ +enum { + USE_ANY_MDS, + USE_RANDOM_MDS, + USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */ +}; + +struct ceph_mds_request; +struct ceph_mds_client; + +/* + * request completion callback + */ +typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc, + struct ceph_mds_request *req); +/* + * wait for request completion callback + */ +typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc, + struct ceph_mds_request *req); + +/* + * an in-flight mds request + */ +struct ceph_mds_request { + u64 r_tid; /* transaction id */ + struct rb_node r_node; + struct ceph_mds_client *r_mdsc; + + int r_op; /* mds op code */ + + /* operation on what? */ + struct inode *r_inode; /* arg1 */ + struct dentry *r_dentry; /* arg1 */ + struct dentry *r_old_dentry; /* arg2: rename from or link from */ + struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */ + char *r_path1, *r_path2; + struct ceph_vino r_ino1, r_ino2; + + struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */ + struct inode *r_target_inode; /* resulting inode */ + + struct mutex r_fill_mutex; + + union ceph_mds_request_args r_args; + int r_fmode; /* file mode, if expecting cap */ + kuid_t r_uid; + kgid_t r_gid; + struct timespec r_stamp; + + /* for choosing which mds to send this request to */ + int r_direct_mode; + u32 r_direct_hash; /* choose dir frag based on this dentry hash */ + bool r_direct_is_hash; /* true if r_direct_hash is valid */ + + /* data payload is used for xattr ops */ + struct ceph_pagelist *r_pagelist; + + /* what caps shall we drop? */ + int r_inode_drop, r_inode_unless; + int r_dentry_drop, r_dentry_unless; + int r_old_dentry_drop, r_old_dentry_unless; + struct inode *r_old_inode; + int r_old_inode_drop, r_old_inode_unless; + + struct ceph_msg *r_request; /* original request */ + int r_request_release_offset; + struct ceph_msg *r_reply; + struct ceph_mds_reply_info_parsed r_reply_info; + struct page *r_locked_page; + int r_err; + bool r_aborted; + + unsigned long r_timeout; /* optional. jiffies */ + unsigned long r_started; /* start time to measure timeout against */ + unsigned long r_request_started; /* start time for mds request only, + used to measure lease durations */ + + /* link unsafe requests to parent directory, for fsync */ + struct inode *r_unsafe_dir; + struct list_head r_unsafe_dir_item; + + struct ceph_mds_session *r_session; + + int r_attempts; /* resend attempts */ + int r_num_fwd; /* number of forward attempts */ + int r_resend_mds; /* mds to resend to next, if any*/ + u32 r_sent_on_mseq; /* cap mseq request was sent at*/ + + struct kref r_kref; + struct list_head r_wait; + struct completion r_completion; + struct completion r_safe_completion; + ceph_mds_request_callback_t r_callback; + ceph_mds_request_wait_callback_t r_wait_for_completion; + struct list_head r_unsafe_item; /* per-session unsafe list item */ + bool r_got_unsafe, r_got_safe, r_got_result; + + bool r_did_prepopulate; + u32 r_readdir_offset; + + struct ceph_cap_reservation r_caps_reservation; + int r_num_caps; +}; + +/* + * mds client state + */ +struct ceph_mds_client { + struct ceph_fs_client *fsc; + struct mutex mutex; /* all nested structures */ + + struct ceph_mdsmap *mdsmap; + struct completion safe_umount_waiters; + wait_queue_head_t session_close_wq; + struct list_head waiting_for_map; + + struct ceph_mds_session **sessions; /* NULL for mds if no session */ + atomic_t num_sessions; + int max_sessions; /* len of s_mds_sessions */ + int stopping; /* true if shutting down */ + + /* + * snap_rwsem will cover cap linkage into snaprealms, and + * realm snap contexts. (later, we can do per-realm snap + * contexts locks..) the empty list contains realms with no + * references (implying they contain no inodes with caps) that + * should be destroyed. + */ + struct rw_semaphore snap_rwsem; + struct rb_root snap_realms; + struct list_head snap_empty; + spinlock_t snap_empty_lock; /* protect snap_empty */ + + u64 last_tid; /* most recent mds request */ + struct rb_root request_tree; /* pending mds requests */ + struct delayed_work delayed_work; /* delayed work */ + unsigned long last_renew_caps; /* last time we renewed our caps */ + struct list_head cap_delay_list; /* caps with delayed release */ + spinlock_t cap_delay_lock; /* protects cap_delay_list */ + struct list_head snap_flush_list; /* cap_snaps ready to flush */ + spinlock_t snap_flush_lock; + + u64 cap_flush_seq; + struct list_head cap_dirty; /* inodes with dirty caps */ + struct list_head cap_dirty_migrating; /* ...that are migration... */ + int num_cap_flushing; /* # caps we are flushing */ + spinlock_t cap_dirty_lock; /* protects above items */ + wait_queue_head_t cap_flushing_wq; + + /* + * Cap reservations + * + * Maintain a global pool of preallocated struct ceph_caps, referenced + * by struct ceph_caps_reservations. This ensures that we preallocate + * memory needed to successfully process an MDS response. (If an MDS + * sends us cap information and we fail to process it, we will have + * problems due to the client and MDS being out of sync.) + * + * Reservations are 'owned' by a ceph_cap_reservation context. + */ + spinlock_t caps_list_lock; + struct list_head caps_list; /* unused (reserved or + unreserved) */ + int caps_total_count; /* total caps allocated */ + int caps_use_count; /* in use */ + int caps_reserve_count; /* unused, reserved */ + int caps_avail_count; /* unused, unreserved */ + int caps_min_count; /* keep at least this many + (unreserved) */ + spinlock_t dentry_lru_lock; + struct list_head dentry_lru; + int num_dentry; +}; + +extern const char *ceph_mds_op_name(int op); + +extern struct ceph_mds_session * +__ceph_lookup_mds_session(struct ceph_mds_client *, int mds); + +static inline struct ceph_mds_session * +ceph_get_mds_session(struct ceph_mds_session *s) +{ + atomic_inc(&s->s_ref); + return s; +} + +extern const char *ceph_session_state_name(int s); + +extern void ceph_put_mds_session(struct ceph_mds_session *s); + +extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc, + struct ceph_msg *msg, int mds); + +extern int ceph_mdsc_init(struct ceph_fs_client *fsc); +extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc); +extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc); + +extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc); + +extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, + struct inode *inode, + struct dentry *dn); + +extern void ceph_invalidate_dir_request(struct ceph_mds_request *req); +extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, + struct inode *dir); +extern struct ceph_mds_request * +ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode); +extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, + struct ceph_mds_request *req); +extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, + struct inode *dir, + struct ceph_mds_request *req); +static inline void ceph_mdsc_get_request(struct ceph_mds_request *req) +{ + kref_get(&req->r_kref); +} +extern void ceph_mdsc_release_request(struct kref *kref); +static inline void ceph_mdsc_put_request(struct ceph_mds_request *req) +{ + kref_put(&req->r_kref, ceph_mdsc_release_request); +} + +extern int ceph_add_cap_releases(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session); +extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session); + +extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); + +extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, + int stop_on_nosnap); + +extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry); +extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, + struct inode *inode, + struct dentry *dentry, char action, + u32 seq); + +extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, + struct ceph_msg *msg); + +extern struct ceph_mds_session * +ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target); +extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session); + +#endif diff --git a/kernel/fs/ceph/mdsmap.c b/kernel/fs/ceph/mdsmap.c new file mode 100644 index 000000000..261531e55 --- /dev/null +++ b/kernel/fs/ceph/mdsmap.c @@ -0,0 +1,189 @@ +#include + +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "super.h" + + +/* + * choose a random mds that is "up" (i.e. has a state > 0), or -1. + */ +int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m) +{ + int n = 0; + int i; + + /* special case for one mds */ + if (1 == m->m_max_mds && m->m_info[0].state > 0) + return 0; + + /* count */ + for (i = 0; i < m->m_max_mds; i++) + if (m->m_info[i].state > 0) + n++; + if (n == 0) + return -1; + + /* pick */ + n = prandom_u32() % n; + i = 0; + for (i = 0; n > 0; i++, n--) + while (m->m_info[i].state <= 0) + i++; + + return i; +} + +/* + * Decode an MDS map + * + * Ignore any fields we don't care about (there are quite a few of + * them). + */ +struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end) +{ + struct ceph_mdsmap *m; + const void *start = *p; + int i, j, n; + int err = -EINVAL; + u16 version; + + m = kzalloc(sizeof(*m), GFP_NOFS); + if (m == NULL) + return ERR_PTR(-ENOMEM); + + ceph_decode_16_safe(p, end, version, bad); + if (version > 3) { + pr_warn("got mdsmap version %d > 3, failing", version); + goto bad; + } + + ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad); + m->m_epoch = ceph_decode_32(p); + m->m_client_epoch = ceph_decode_32(p); + m->m_last_failure = ceph_decode_32(p); + m->m_root = ceph_decode_32(p); + m->m_session_timeout = ceph_decode_32(p); + m->m_session_autoclose = ceph_decode_32(p); + m->m_max_file_size = ceph_decode_64(p); + m->m_max_mds = ceph_decode_32(p); + + m->m_info = kcalloc(m->m_max_mds, sizeof(*m->m_info), GFP_NOFS); + if (m->m_info == NULL) + goto badmem; + + /* pick out active nodes from mds_info (state > 0) */ + n = ceph_decode_32(p); + for (i = 0; i < n; i++) { + u64 global_id; + u32 namelen; + s32 mds, inc, state; + u64 state_seq; + u8 infoversion; + struct ceph_entity_addr addr; + u32 num_export_targets; + void *pexport_targets = NULL; + struct ceph_timespec laggy_since; + struct ceph_mds_info *info; + + ceph_decode_need(p, end, sizeof(u64)*2 + 1 + sizeof(u32), bad); + global_id = ceph_decode_64(p); + infoversion = ceph_decode_8(p); + *p += sizeof(u64); + namelen = ceph_decode_32(p); /* skip mds name */ + *p += namelen; + + ceph_decode_need(p, end, + 4*sizeof(u32) + sizeof(u64) + + sizeof(addr) + sizeof(struct ceph_timespec), + bad); + mds = ceph_decode_32(p); + inc = ceph_decode_32(p); + state = ceph_decode_32(p); + state_seq = ceph_decode_64(p); + ceph_decode_copy(p, &addr, sizeof(addr)); + ceph_decode_addr(&addr); + ceph_decode_copy(p, &laggy_since, sizeof(laggy_since)); + *p += sizeof(u32); + ceph_decode_32_safe(p, end, namelen, bad); + *p += namelen; + if (infoversion >= 2) { + ceph_decode_32_safe(p, end, num_export_targets, bad); + pexport_targets = *p; + *p += num_export_targets * sizeof(u32); + } else { + num_export_targets = 0; + } + + dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s\n", + i+1, n, global_id, mds, inc, + ceph_pr_addr(&addr.in_addr), + ceph_mds_state_name(state)); + + if (mds < 0 || mds >= m->m_max_mds || state <= 0) + continue; + + info = &m->m_info[mds]; + info->global_id = global_id; + info->state = state; + info->addr = addr; + info->laggy = (laggy_since.tv_sec != 0 || + laggy_since.tv_nsec != 0); + info->num_export_targets = num_export_targets; + if (num_export_targets) { + info->export_targets = kcalloc(num_export_targets, + sizeof(u32), GFP_NOFS); + if (info->export_targets == NULL) + goto badmem; + for (j = 0; j < num_export_targets; j++) + info->export_targets[j] = + ceph_decode_32(&pexport_targets); + } else { + info->export_targets = NULL; + } + } + + /* pg_pools */ + ceph_decode_32_safe(p, end, n, bad); + m->m_num_data_pg_pools = n; + m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS); + if (!m->m_data_pg_pools) + goto badmem; + ceph_decode_need(p, end, sizeof(u64)*(n+1), bad); + for (i = 0; i < n; i++) + m->m_data_pg_pools[i] = ceph_decode_64(p); + m->m_cas_pg_pool = ceph_decode_64(p); + + /* ok, we don't care about the rest. */ + dout("mdsmap_decode success epoch %u\n", m->m_epoch); + return m; + +badmem: + err = -ENOMEM; +bad: + pr_err("corrupt mdsmap\n"); + print_hex_dump(KERN_DEBUG, "mdsmap: ", + DUMP_PREFIX_OFFSET, 16, 1, + start, end - start, true); + ceph_mdsmap_destroy(m); + return ERR_PTR(err); +} + +void ceph_mdsmap_destroy(struct ceph_mdsmap *m) +{ + int i; + + for (i = 0; i < m->m_max_mds; i++) + kfree(m->m_info[i].export_targets); + kfree(m->m_info); + kfree(m->m_data_pg_pools); + kfree(m); +} diff --git a/kernel/fs/ceph/snap.c b/kernel/fs/ceph/snap.c new file mode 100644 index 000000000..a97e39f09 --- /dev/null +++ b/kernel/fs/ceph/snap.c @@ -0,0 +1,977 @@ +#include + +#include +#include + +#include "super.h" +#include "mds_client.h" + +#include + +/* + * Snapshots in ceph are driven in large part by cooperation from the + * client. In contrast to local file systems or file servers that + * implement snapshots at a single point in the system, ceph's + * distributed access to storage requires clients to help decide + * whether a write logically occurs before or after a recently created + * snapshot. + * + * This provides a perfect instantanous client-wide snapshot. Between + * clients, however, snapshots may appear to be applied at slightly + * different points in time, depending on delays in delivering the + * snapshot notification. + * + * Snapshots are _not_ file system-wide. Instead, each snapshot + * applies to the subdirectory nested beneath some directory. This + * effectively divides the hierarchy into multiple "realms," where all + * of the files contained by each realm share the same set of + * snapshots. An individual realm's snap set contains snapshots + * explicitly created on that realm, as well as any snaps in its + * parent's snap set _after_ the point at which the parent became it's + * parent (due to, say, a rename). Similarly, snaps from prior parents + * during the time intervals during which they were the parent are included. + * + * The client is spared most of this detail, fortunately... it must only + * maintains a hierarchy of realms reflecting the current parent/child + * realm relationship, and for each realm has an explicit list of snaps + * inherited from prior parents. + * + * A snap_realm struct is maintained for realms containing every inode + * with an open cap in the system. (The needed snap realm information is + * provided by the MDS whenever a cap is issued, i.e., on open.) A 'seq' + * version number is used to ensure that as realm parameters change (new + * snapshot, new parent, etc.) the client's realm hierarchy is updated. + * + * The realm hierarchy drives the generation of a 'snap context' for each + * realm, which simply lists the resulting set of snaps for the realm. This + * is attached to any writes sent to OSDs. + */ +/* + * Unfortunately error handling is a bit mixed here. If we get a snap + * update, but don't have enough memory to update our realm hierarchy, + * it's not clear what we can do about it (besides complaining to the + * console). + */ + + +/* + * increase ref count for the realm + * + * caller must hold snap_rwsem for write. + */ +void ceph_get_snap_realm(struct ceph_mds_client *mdsc, + struct ceph_snap_realm *realm) +{ + dout("get_realm %p %d -> %d\n", realm, + atomic_read(&realm->nref), atomic_read(&realm->nref)+1); + /* + * since we _only_ increment realm refs or empty the empty + * list with snap_rwsem held, adjusting the empty list here is + * safe. we do need to protect against concurrent empty list + * additions, however. + */ + if (atomic_inc_return(&realm->nref) == 1) { + spin_lock(&mdsc->snap_empty_lock); + list_del_init(&realm->empty_item); + spin_unlock(&mdsc->snap_empty_lock); + } +} + +static void __insert_snap_realm(struct rb_root *root, + struct ceph_snap_realm *new) +{ + struct rb_node **p = &root->rb_node; + struct rb_node *parent = NULL; + struct ceph_snap_realm *r = NULL; + + while (*p) { + parent = *p; + r = rb_entry(parent, struct ceph_snap_realm, node); + if (new->ino < r->ino) + p = &(*p)->rb_left; + else if (new->ino > r->ino) + p = &(*p)->rb_right; + else + BUG(); + } + + rb_link_node(&new->node, parent, p); + rb_insert_color(&new->node, root); +} + +/* + * create and get the realm rooted at @ino and bump its ref count. + * + * caller must hold snap_rwsem for write. + */ +static struct ceph_snap_realm *ceph_create_snap_realm( + struct ceph_mds_client *mdsc, + u64 ino) +{ + struct ceph_snap_realm *realm; + + realm = kzalloc(sizeof(*realm), GFP_NOFS); + if (!realm) + return ERR_PTR(-ENOMEM); + + atomic_set(&realm->nref, 1); /* for caller */ + realm->ino = ino; + INIT_LIST_HEAD(&realm->children); + INIT_LIST_HEAD(&realm->child_item); + INIT_LIST_HEAD(&realm->empty_item); + INIT_LIST_HEAD(&realm->dirty_item); + INIT_LIST_HEAD(&realm->inodes_with_caps); + spin_lock_init(&realm->inodes_with_caps_lock); + __insert_snap_realm(&mdsc->snap_realms, realm); + dout("create_snap_realm %llx %p\n", realm->ino, realm); + return realm; +} + +/* + * lookup the realm rooted at @ino. + * + * caller must hold snap_rwsem for write. + */ +static struct ceph_snap_realm *__lookup_snap_realm(struct ceph_mds_client *mdsc, + u64 ino) +{ + struct rb_node *n = mdsc->snap_realms.rb_node; + struct ceph_snap_realm *r; + + while (n) { + r = rb_entry(n, struct ceph_snap_realm, node); + if (ino < r->ino) + n = n->rb_left; + else if (ino > r->ino) + n = n->rb_right; + else { + dout("lookup_snap_realm %llx %p\n", r->ino, r); + return r; + } + } + return NULL; +} + +struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, + u64 ino) +{ + struct ceph_snap_realm *r; + r = __lookup_snap_realm(mdsc, ino); + if (r) + ceph_get_snap_realm(mdsc, r); + return r; +} + +static void __put_snap_realm(struct ceph_mds_client *mdsc, + struct ceph_snap_realm *realm); + +/* + * called with snap_rwsem (write) + */ +static void __destroy_snap_realm(struct ceph_mds_client *mdsc, + struct ceph_snap_realm *realm) +{ + dout("__destroy_snap_realm %p %llx\n", realm, realm->ino); + + rb_erase(&realm->node, &mdsc->snap_realms); + + if (realm->parent) { + list_del_init(&realm->child_item); + __put_snap_realm(mdsc, realm->parent); + } + + kfree(realm->prior_parent_snaps); + kfree(realm->snaps); + ceph_put_snap_context(realm->cached_context); + kfree(realm); +} + +/* + * caller holds snap_rwsem (write) + */ +static void __put_snap_realm(struct ceph_mds_client *mdsc, + struct ceph_snap_realm *realm) +{ + dout("__put_snap_realm %llx %p %d -> %d\n", realm->ino, realm, + atomic_read(&realm->nref), atomic_read(&realm->nref)-1); + if (atomic_dec_and_test(&realm->nref)) + __destroy_snap_realm(mdsc, realm); +} + +/* + * caller needn't hold any locks + */ +void ceph_put_snap_realm(struct ceph_mds_client *mdsc, + struct ceph_snap_realm *realm) +{ + dout("put_snap_realm %llx %p %d -> %d\n", realm->ino, realm, + atomic_read(&realm->nref), atomic_read(&realm->nref)-1); + if (!atomic_dec_and_test(&realm->nref)) + return; + + if (down_write_trylock(&mdsc->snap_rwsem)) { + __destroy_snap_realm(mdsc, realm); + up_write(&mdsc->snap_rwsem); + } else { + spin_lock(&mdsc->snap_empty_lock); + list_add(&realm->empty_item, &mdsc->snap_empty); + spin_unlock(&mdsc->snap_empty_lock); + } +} + +/* + * Clean up any realms whose ref counts have dropped to zero. Note + * that this does not include realms who were created but not yet + * used. + * + * Called under snap_rwsem (write) + */ +static void __cleanup_empty_realms(struct ceph_mds_client *mdsc) +{ + struct ceph_snap_realm *realm; + + spin_lock(&mdsc->snap_empty_lock); + while (!list_empty(&mdsc->snap_empty)) { + realm = list_first_entry(&mdsc->snap_empty, + struct ceph_snap_realm, empty_item); + list_del(&realm->empty_item); + spin_unlock(&mdsc->snap_empty_lock); + __destroy_snap_realm(mdsc, realm); + spin_lock(&mdsc->snap_empty_lock); + } + spin_unlock(&mdsc->snap_empty_lock); +} + +void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc) +{ + down_write(&mdsc->snap_rwsem); + __cleanup_empty_realms(mdsc); + up_write(&mdsc->snap_rwsem); +} + +/* + * adjust the parent realm of a given @realm. adjust child list, and parent + * pointers, and ref counts appropriately. + * + * return true if parent was changed, 0 if unchanged, <0 on error. + * + * caller must hold snap_rwsem for write. + */ +static int adjust_snap_realm_parent(struct ceph_mds_client *mdsc, + struct ceph_snap_realm *realm, + u64 parentino) +{ + struct ceph_snap_realm *parent; + + if (realm->parent_ino == parentino) + return 0; + + parent = ceph_lookup_snap_realm(mdsc, parentino); + if (!parent) { + parent = ceph_create_snap_realm(mdsc, parentino); + if (IS_ERR(parent)) + return PTR_ERR(parent); + } + dout("adjust_snap_realm_parent %llx %p: %llx %p -> %llx %p\n", + realm->ino, realm, realm->parent_ino, realm->parent, + parentino, parent); + if (realm->parent) { + list_del_init(&realm->child_item); + ceph_put_snap_realm(mdsc, realm->parent); + } + realm->parent_ino = parentino; + realm->parent = parent; + list_add(&realm->child_item, &parent->children); + return 1; +} + + +static int cmpu64_rev(const void *a, const void *b) +{ + if (*(u64 *)a < *(u64 *)b) + return 1; + if (*(u64 *)a > *(u64 *)b) + return -1; + return 0; +} + + +static struct ceph_snap_context *empty_snapc; + +/* + * build the snap context for a given realm. + */ +static int build_snap_context(struct ceph_snap_realm *realm) +{ + struct ceph_snap_realm *parent = realm->parent; + struct ceph_snap_context *snapc; + int err = 0; + u32 num = realm->num_prior_parent_snaps + realm->num_snaps; + + /* + * build parent context, if it hasn't been built. + * conservatively estimate that all parent snaps might be + * included by us. + */ + if (parent) { + if (!parent->cached_context) { + err = build_snap_context(parent); + if (err) + goto fail; + } + num += parent->cached_context->num_snaps; + } + + /* do i actually need to update? not if my context seq + matches realm seq, and my parents' does to. (this works + because we rebuild_snap_realms() works _downward_ in + hierarchy after each update.) */ + if (realm->cached_context && + realm->cached_context->seq == realm->seq && + (!parent || + realm->cached_context->seq >= parent->cached_context->seq)) { + dout("build_snap_context %llx %p: %p seq %lld (%u snaps)" + " (unchanged)\n", + realm->ino, realm, realm->cached_context, + realm->cached_context->seq, + (unsigned int) realm->cached_context->num_snaps); + return 0; + } + + if (num == 0 && realm->seq == empty_snapc->seq) { + ceph_get_snap_context(empty_snapc); + snapc = empty_snapc; + goto done; + } + + /* alloc new snap context */ + err = -ENOMEM; + if (num > (SIZE_MAX - sizeof(*snapc)) / sizeof(u64)) + goto fail; + snapc = ceph_create_snap_context(num, GFP_NOFS); + if (!snapc) + goto fail; + + /* build (reverse sorted) snap vector */ + num = 0; + snapc->seq = realm->seq; + if (parent) { + u32 i; + + /* include any of parent's snaps occurring _after_ my + parent became my parent */ + for (i = 0; i < parent->cached_context->num_snaps; i++) + if (parent->cached_context->snaps[i] >= + realm->parent_since) + snapc->snaps[num++] = + parent->cached_context->snaps[i]; + if (parent->cached_context->seq > snapc->seq) + snapc->seq = parent->cached_context->seq; + } + memcpy(snapc->snaps + num, realm->snaps, + sizeof(u64)*realm->num_snaps); + num += realm->num_snaps; + memcpy(snapc->snaps + num, realm->prior_parent_snaps, + sizeof(u64)*realm->num_prior_parent_snaps); + num += realm->num_prior_parent_snaps; + + sort(snapc->snaps, num, sizeof(u64), cmpu64_rev, NULL); + snapc->num_snaps = num; + dout("build_snap_context %llx %p: %p seq %lld (%u snaps)\n", + realm->ino, realm, snapc, snapc->seq, + (unsigned int) snapc->num_snaps); + +done: + ceph_put_snap_context(realm->cached_context); + realm->cached_context = snapc; + return 0; + +fail: + /* + * if we fail, clear old (incorrect) cached_context... hopefully + * we'll have better luck building it later + */ + if (realm->cached_context) { + ceph_put_snap_context(realm->cached_context); + realm->cached_context = NULL; + } + pr_err("build_snap_context %llx %p fail %d\n", realm->ino, + realm, err); + return err; +} + +/* + * rebuild snap context for the given realm and all of its children. + */ +static void rebuild_snap_realms(struct ceph_snap_realm *realm) +{ + struct ceph_snap_realm *child; + + dout("rebuild_snap_realms %llx %p\n", realm->ino, realm); + build_snap_context(realm); + + list_for_each_entry(child, &realm->children, child_item) + rebuild_snap_realms(child); +} + + +/* + * helper to allocate and decode an array of snapids. free prior + * instance, if any. + */ +static int dup_array(u64 **dst, __le64 *src, u32 num) +{ + u32 i; + + kfree(*dst); + if (num) { + *dst = kcalloc(num, sizeof(u64), GFP_NOFS); + if (!*dst) + return -ENOMEM; + for (i = 0; i < num; i++) + (*dst)[i] = get_unaligned_le64(src + i); + } else { + *dst = NULL; + } + return 0; +} + + +/* + * When a snapshot is applied, the size/mtime inode metadata is queued + * in a ceph_cap_snap (one for each snapshot) until writeback + * completes and the metadata can be flushed back to the MDS. + * + * However, if a (sync) write is currently in-progress when we apply + * the snapshot, we have to wait until the write succeeds or fails + * (and a final size/mtime is known). In this case the + * cap_snap->writing = 1, and is said to be "pending." When the write + * finishes, we __ceph_finish_cap_snap(). + * + * Caller must hold snap_rwsem for read (i.e., the realm topology won't + * change). + */ +void ceph_queue_cap_snap(struct ceph_inode_info *ci) +{ + struct inode *inode = &ci->vfs_inode; + struct ceph_cap_snap *capsnap; + int used, dirty; + + capsnap = kzalloc(sizeof(*capsnap), GFP_NOFS); + if (!capsnap) { + pr_err("ENOMEM allocating ceph_cap_snap on %p\n", inode); + return; + } + + spin_lock(&ci->i_ceph_lock); + used = __ceph_caps_used(ci); + dirty = __ceph_caps_dirty(ci); + + /* + * If there is a write in progress, treat that as a dirty Fw, + * even though it hasn't completed yet; by the time we finish + * up this capsnap it will be. + */ + if (used & CEPH_CAP_FILE_WR) + dirty |= CEPH_CAP_FILE_WR; + + if (__ceph_have_pending_cap_snap(ci)) { + /* there is no point in queuing multiple "pending" cap_snaps, + as no new writes are allowed to start when pending, so any + writes in progress now were started before the previous + cap_snap. lucky us. */ + dout("queue_cap_snap %p already pending\n", inode); + kfree(capsnap); + } else if (ci->i_snap_realm->cached_context == empty_snapc) { + dout("queue_cap_snap %p empty snapc\n", inode); + kfree(capsnap); + } else if (dirty & (CEPH_CAP_AUTH_EXCL|CEPH_CAP_XATTR_EXCL| + CEPH_CAP_FILE_EXCL|CEPH_CAP_FILE_WR)) { + struct ceph_snap_context *snapc = ci->i_head_snapc; + + /* + * if we are a sync write, we may need to go to the snaprealm + * to get the current snapc. + */ + if (!snapc) + snapc = ci->i_snap_realm->cached_context; + + dout("queue_cap_snap %p cap_snap %p queuing under %p %s\n", + inode, capsnap, snapc, ceph_cap_string(dirty)); + ihold(inode); + + atomic_set(&capsnap->nref, 1); + capsnap->ci = ci; + INIT_LIST_HEAD(&capsnap->ci_item); + INIT_LIST_HEAD(&capsnap->flushing_item); + + capsnap->follows = snapc->seq; + capsnap->issued = __ceph_caps_issued(ci, NULL); + capsnap->dirty = dirty; + + capsnap->mode = inode->i_mode; + capsnap->uid = inode->i_uid; + capsnap->gid = inode->i_gid; + + if (dirty & CEPH_CAP_XATTR_EXCL) { + __ceph_build_xattrs_blob(ci); + capsnap->xattr_blob = + ceph_buffer_get(ci->i_xattrs.blob); + capsnap->xattr_version = ci->i_xattrs.version; + } else { + capsnap->xattr_blob = NULL; + capsnap->xattr_version = 0; + } + + capsnap->inline_data = ci->i_inline_version != CEPH_INLINE_NONE; + + /* dirty page count moved from _head to this cap_snap; + all subsequent writes page dirties occur _after_ this + snapshot. */ + capsnap->dirty_pages = ci->i_wrbuffer_ref_head; + ci->i_wrbuffer_ref_head = 0; + capsnap->context = snapc; + ci->i_head_snapc = + ceph_get_snap_context(ci->i_snap_realm->cached_context); + dout(" new snapc is %p\n", ci->i_head_snapc); + list_add_tail(&capsnap->ci_item, &ci->i_cap_snaps); + + if (used & CEPH_CAP_FILE_WR) { + dout("queue_cap_snap %p cap_snap %p snapc %p" + " seq %llu used WR, now pending\n", inode, + capsnap, snapc, snapc->seq); + capsnap->writing = 1; + } else { + /* note mtime, size NOW. */ + __ceph_finish_cap_snap(ci, capsnap); + } + } else { + dout("queue_cap_snap %p nothing dirty|writing\n", inode); + kfree(capsnap); + } + + spin_unlock(&ci->i_ceph_lock); +} + +/* + * Finalize the size, mtime for a cap_snap.. that is, settle on final values + * to be used for the snapshot, to be flushed back to the mds. + * + * If capsnap can now be flushed, add to snap_flush list, and return 1. + * + * Caller must hold i_ceph_lock. + */ +int __ceph_finish_cap_snap(struct ceph_inode_info *ci, + struct ceph_cap_snap *capsnap) +{ + struct inode *inode = &ci->vfs_inode; + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; + + BUG_ON(capsnap->writing); + capsnap->size = inode->i_size; + capsnap->mtime = inode->i_mtime; + capsnap->atime = inode->i_atime; + capsnap->ctime = inode->i_ctime; + capsnap->time_warp_seq = ci->i_time_warp_seq; + if (capsnap->dirty_pages) { + dout("finish_cap_snap %p cap_snap %p snapc %p %llu %s s=%llu " + "still has %d dirty pages\n", inode, capsnap, + capsnap->context, capsnap->context->seq, + ceph_cap_string(capsnap->dirty), capsnap->size, + capsnap->dirty_pages); + return 0; + } + dout("finish_cap_snap %p cap_snap %p snapc %p %llu %s s=%llu\n", + inode, capsnap, capsnap->context, + capsnap->context->seq, ceph_cap_string(capsnap->dirty), + capsnap->size); + + spin_lock(&mdsc->snap_flush_lock); + list_add_tail(&ci->i_snap_flush_item, &mdsc->snap_flush_list); + spin_unlock(&mdsc->snap_flush_lock); + return 1; /* caller may want to ceph_flush_snaps */ +} + +/* + * Queue cap_snaps for snap writeback for this realm and its children. + * Called under snap_rwsem, so realm topology won't change. + */ +static void queue_realm_cap_snaps(struct ceph_snap_realm *realm) +{ + struct ceph_inode_info *ci; + struct inode *lastinode = NULL; + struct ceph_snap_realm *child; + + dout("queue_realm_cap_snaps %p %llx inodes\n", realm, realm->ino); + + spin_lock(&realm->inodes_with_caps_lock); + list_for_each_entry(ci, &realm->inodes_with_caps, + i_snap_realm_item) { + struct inode *inode = igrab(&ci->vfs_inode); + if (!inode) + continue; + spin_unlock(&realm->inodes_with_caps_lock); + iput(lastinode); + lastinode = inode; + ceph_queue_cap_snap(ci); + spin_lock(&realm->inodes_with_caps_lock); + } + spin_unlock(&realm->inodes_with_caps_lock); + iput(lastinode); + + list_for_each_entry(child, &realm->children, child_item) { + dout("queue_realm_cap_snaps %p %llx queue child %p %llx\n", + realm, realm->ino, child, child->ino); + list_del_init(&child->dirty_item); + list_add(&child->dirty_item, &realm->dirty_item); + } + + list_del_init(&realm->dirty_item); + dout("queue_realm_cap_snaps %p %llx done\n", realm, realm->ino); +} + +/* + * Parse and apply a snapblob "snap trace" from the MDS. This specifies + * the snap realm parameters from a given realm and all of its ancestors, + * up to the root. + * + * Caller must hold snap_rwsem for write. + */ +int ceph_update_snap_trace(struct ceph_mds_client *mdsc, + void *p, void *e, bool deletion, + struct ceph_snap_realm **realm_ret) +{ + struct ceph_mds_snap_realm *ri; /* encoded */ + __le64 *snaps; /* encoded */ + __le64 *prior_parent_snaps; /* encoded */ + struct ceph_snap_realm *realm = NULL; + struct ceph_snap_realm *first_realm = NULL; + int invalidate = 0; + int err = -ENOMEM; + LIST_HEAD(dirty_realms); + + dout("update_snap_trace deletion=%d\n", deletion); +more: + ceph_decode_need(&p, e, sizeof(*ri), bad); + ri = p; + p += sizeof(*ri); + ceph_decode_need(&p, e, sizeof(u64)*(le32_to_cpu(ri->num_snaps) + + le32_to_cpu(ri->num_prior_parent_snaps)), bad); + snaps = p; + p += sizeof(u64) * le32_to_cpu(ri->num_snaps); + prior_parent_snaps = p; + p += sizeof(u64) * le32_to_cpu(ri->num_prior_parent_snaps); + + realm = ceph_lookup_snap_realm(mdsc, le64_to_cpu(ri->ino)); + if (!realm) { + realm = ceph_create_snap_realm(mdsc, le64_to_cpu(ri->ino)); + if (IS_ERR(realm)) { + err = PTR_ERR(realm); + goto fail; + } + } + + /* ensure the parent is correct */ + err = adjust_snap_realm_parent(mdsc, realm, le64_to_cpu(ri->parent)); + if (err < 0) + goto fail; + invalidate += err; + + if (le64_to_cpu(ri->seq) > realm->seq) { + dout("update_snap_trace updating %llx %p %lld -> %lld\n", + realm->ino, realm, realm->seq, le64_to_cpu(ri->seq)); + /* update realm parameters, snap lists */ + realm->seq = le64_to_cpu(ri->seq); + realm->created = le64_to_cpu(ri->created); + realm->parent_since = le64_to_cpu(ri->parent_since); + + realm->num_snaps = le32_to_cpu(ri->num_snaps); + err = dup_array(&realm->snaps, snaps, realm->num_snaps); + if (err < 0) + goto fail; + + realm->num_prior_parent_snaps = + le32_to_cpu(ri->num_prior_parent_snaps); + err = dup_array(&realm->prior_parent_snaps, prior_parent_snaps, + realm->num_prior_parent_snaps); + if (err < 0) + goto fail; + + /* queue realm for cap_snap creation */ + list_add(&realm->dirty_item, &dirty_realms); + + invalidate = 1; + } else if (!realm->cached_context) { + dout("update_snap_trace %llx %p seq %lld new\n", + realm->ino, realm, realm->seq); + invalidate = 1; + } else { + dout("update_snap_trace %llx %p seq %lld unchanged\n", + realm->ino, realm, realm->seq); + } + + dout("done with %llx %p, invalidated=%d, %p %p\n", realm->ino, + realm, invalidate, p, e); + + /* invalidate when we reach the _end_ (root) of the trace */ + if (invalidate && p >= e) + rebuild_snap_realms(realm); + + if (!first_realm) + first_realm = realm; + else + ceph_put_snap_realm(mdsc, realm); + + if (p < e) + goto more; + + /* + * queue cap snaps _after_ we've built the new snap contexts, + * so that i_head_snapc can be set appropriately. + */ + while (!list_empty(&dirty_realms)) { + realm = list_first_entry(&dirty_realms, struct ceph_snap_realm, + dirty_item); + queue_realm_cap_snaps(realm); + } + + if (realm_ret) + *realm_ret = first_realm; + else + ceph_put_snap_realm(mdsc, first_realm); + + __cleanup_empty_realms(mdsc); + return 0; + +bad: + err = -EINVAL; +fail: + if (realm && !IS_ERR(realm)) + ceph_put_snap_realm(mdsc, realm); + if (first_realm) + ceph_put_snap_realm(mdsc, first_realm); + pr_err("update_snap_trace error %d\n", err); + return err; +} + + +/* + * Send any cap_snaps that are queued for flush. Try to carry + * s_mutex across multiple snap flushes to avoid locking overhead. + * + * Caller holds no locks. + */ +static void flush_snaps(struct ceph_mds_client *mdsc) +{ + struct ceph_inode_info *ci; + struct inode *inode; + struct ceph_mds_session *session = NULL; + + dout("flush_snaps\n"); + spin_lock(&mdsc->snap_flush_lock); + while (!list_empty(&mdsc->snap_flush_list)) { + ci = list_first_entry(&mdsc->snap_flush_list, + struct ceph_inode_info, i_snap_flush_item); + inode = &ci->vfs_inode; + ihold(inode); + spin_unlock(&mdsc->snap_flush_lock); + spin_lock(&ci->i_ceph_lock); + __ceph_flush_snaps(ci, &session, 0); + spin_unlock(&ci->i_ceph_lock); + iput(inode); + spin_lock(&mdsc->snap_flush_lock); + } + spin_unlock(&mdsc->snap_flush_lock); + + if (session) { + mutex_unlock(&session->s_mutex); + ceph_put_mds_session(session); + } + dout("flush_snaps done\n"); +} + + +/* + * Handle a snap notification from the MDS. + * + * This can take two basic forms: the simplest is just a snap creation + * or deletion notification on an existing realm. This should update the + * realm and its children. + * + * The more difficult case is realm creation, due to snap creation at a + * new point in the file hierarchy, or due to a rename that moves a file or + * directory into another realm. + */ +void ceph_handle_snap(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session, + struct ceph_msg *msg) +{ + struct super_block *sb = mdsc->fsc->sb; + int mds = session->s_mds; + u64 split; + int op; + int trace_len; + struct ceph_snap_realm *realm = NULL; + void *p = msg->front.iov_base; + void *e = p + msg->front.iov_len; + struct ceph_mds_snap_head *h; + int num_split_inos, num_split_realms; + __le64 *split_inos = NULL, *split_realms = NULL; + int i; + int locked_rwsem = 0; + + /* decode */ + if (msg->front.iov_len < sizeof(*h)) + goto bad; + h = p; + op = le32_to_cpu(h->op); + split = le64_to_cpu(h->split); /* non-zero if we are splitting an + * existing realm */ + num_split_inos = le32_to_cpu(h->num_split_inos); + num_split_realms = le32_to_cpu(h->num_split_realms); + trace_len = le32_to_cpu(h->trace_len); + p += sizeof(*h); + + dout("handle_snap from mds%d op %s split %llx tracelen %d\n", mds, + ceph_snap_op_name(op), split, trace_len); + + mutex_lock(&session->s_mutex); + session->s_seq++; + mutex_unlock(&session->s_mutex); + + down_write(&mdsc->snap_rwsem); + locked_rwsem = 1; + + if (op == CEPH_SNAP_OP_SPLIT) { + struct ceph_mds_snap_realm *ri; + + /* + * A "split" breaks part of an existing realm off into + * a new realm. The MDS provides a list of inodes + * (with caps) and child realms that belong to the new + * child. + */ + split_inos = p; + p += sizeof(u64) * num_split_inos; + split_realms = p; + p += sizeof(u64) * num_split_realms; + ceph_decode_need(&p, e, sizeof(*ri), bad); + /* we will peek at realm info here, but will _not_ + * advance p, as the realm update will occur below in + * ceph_update_snap_trace. */ + ri = p; + + realm = ceph_lookup_snap_realm(mdsc, split); + if (!realm) { + realm = ceph_create_snap_realm(mdsc, split); + if (IS_ERR(realm)) + goto out; + } + + dout("splitting snap_realm %llx %p\n", realm->ino, realm); + for (i = 0; i < num_split_inos; i++) { + struct ceph_vino vino = { + .ino = le64_to_cpu(split_inos[i]), + .snap = CEPH_NOSNAP, + }; + struct inode *inode = ceph_find_inode(sb, vino); + struct ceph_inode_info *ci; + struct ceph_snap_realm *oldrealm; + + if (!inode) + continue; + ci = ceph_inode(inode); + + spin_lock(&ci->i_ceph_lock); + if (!ci->i_snap_realm) + goto skip_inode; + /* + * If this inode belongs to a realm that was + * created after our new realm, we experienced + * a race (due to another split notifications + * arriving from a different MDS). So skip + * this inode. + */ + if (ci->i_snap_realm->created > + le64_to_cpu(ri->created)) { + dout(" leaving %p in newer realm %llx %p\n", + inode, ci->i_snap_realm->ino, + ci->i_snap_realm); + goto skip_inode; + } + dout(" will move %p to split realm %llx %p\n", + inode, realm->ino, realm); + /* + * Move the inode to the new realm + */ + spin_lock(&realm->inodes_with_caps_lock); + list_del_init(&ci->i_snap_realm_item); + list_add(&ci->i_snap_realm_item, + &realm->inodes_with_caps); + oldrealm = ci->i_snap_realm; + ci->i_snap_realm = realm; + spin_unlock(&realm->inodes_with_caps_lock); + spin_unlock(&ci->i_ceph_lock); + + ceph_get_snap_realm(mdsc, realm); + ceph_put_snap_realm(mdsc, oldrealm); + + iput(inode); + continue; + +skip_inode: + spin_unlock(&ci->i_ceph_lock); + iput(inode); + } + + /* we may have taken some of the old realm's children. */ + for (i = 0; i < num_split_realms; i++) { + struct ceph_snap_realm *child = + __lookup_snap_realm(mdsc, + le64_to_cpu(split_realms[i])); + if (!child) + continue; + adjust_snap_realm_parent(mdsc, child, realm->ino); + } + } + + /* + * update using the provided snap trace. if we are deleting a + * snap, we can avoid queueing cap_snaps. + */ + ceph_update_snap_trace(mdsc, p, e, + op == CEPH_SNAP_OP_DESTROY, NULL); + + if (op == CEPH_SNAP_OP_SPLIT) + /* we took a reference when we created the realm, above */ + ceph_put_snap_realm(mdsc, realm); + + __cleanup_empty_realms(mdsc); + + up_write(&mdsc->snap_rwsem); + + flush_snaps(mdsc); + return; + +bad: + pr_err("corrupt snap message from mds%d\n", mds); + ceph_msg_dump(msg); +out: + if (locked_rwsem) + up_write(&mdsc->snap_rwsem); + return; +} + +int __init ceph_snap_init(void) +{ + empty_snapc = ceph_create_snap_context(0, GFP_NOFS); + if (!empty_snapc) + return -ENOMEM; + empty_snapc->seq = 1; + return 0; +} + +void ceph_snap_exit(void) +{ + ceph_put_snap_context(empty_snapc); +} diff --git a/kernel/fs/ceph/strings.c b/kernel/fs/ceph/strings.c new file mode 100644 index 000000000..89e6bc321 --- /dev/null +++ b/kernel/fs/ceph/strings.c @@ -0,0 +1,125 @@ +/* + * Ceph fs string constants + */ +#include +#include + + +const char *ceph_mds_state_name(int s) +{ + switch (s) { + /* down and out */ + case CEPH_MDS_STATE_DNE: return "down:dne"; + case CEPH_MDS_STATE_STOPPED: return "down:stopped"; + /* up and out */ + case CEPH_MDS_STATE_BOOT: return "up:boot"; + case CEPH_MDS_STATE_STANDBY: return "up:standby"; + case CEPH_MDS_STATE_STANDBY_REPLAY: return "up:standby-replay"; + case CEPH_MDS_STATE_REPLAYONCE: return "up:oneshot-replay"; + case CEPH_MDS_STATE_CREATING: return "up:creating"; + case CEPH_MDS_STATE_STARTING: return "up:starting"; + /* up and in */ + case CEPH_MDS_STATE_REPLAY: return "up:replay"; + case CEPH_MDS_STATE_RESOLVE: return "up:resolve"; + case CEPH_MDS_STATE_RECONNECT: return "up:reconnect"; + case CEPH_MDS_STATE_REJOIN: return "up:rejoin"; + case CEPH_MDS_STATE_CLIENTREPLAY: return "up:clientreplay"; + case CEPH_MDS_STATE_ACTIVE: return "up:active"; + case CEPH_MDS_STATE_STOPPING: return "up:stopping"; + } + return "???"; +} + +const char *ceph_session_op_name(int op) +{ + switch (op) { + case CEPH_SESSION_REQUEST_OPEN: return "request_open"; + case CEPH_SESSION_OPEN: return "open"; + case CEPH_SESSION_REQUEST_CLOSE: return "request_close"; + case CEPH_SESSION_CLOSE: return "close"; + case CEPH_SESSION_REQUEST_RENEWCAPS: return "request_renewcaps"; + case CEPH_SESSION_RENEWCAPS: return "renewcaps"; + case CEPH_SESSION_STALE: return "stale"; + case CEPH_SESSION_RECALL_STATE: return "recall_state"; + case CEPH_SESSION_FLUSHMSG: return "flushmsg"; + case CEPH_SESSION_FLUSHMSG_ACK: return "flushmsg_ack"; + } + return "???"; +} + +const char *ceph_mds_op_name(int op) +{ + switch (op) { + case CEPH_MDS_OP_LOOKUP: return "lookup"; + case CEPH_MDS_OP_LOOKUPHASH: return "lookuphash"; + case CEPH_MDS_OP_LOOKUPPARENT: return "lookupparent"; + case CEPH_MDS_OP_LOOKUPINO: return "lookupino"; + case CEPH_MDS_OP_LOOKUPNAME: return "lookupname"; + case CEPH_MDS_OP_GETATTR: return "getattr"; + case CEPH_MDS_OP_SETXATTR: return "setxattr"; + case CEPH_MDS_OP_SETATTR: return "setattr"; + case CEPH_MDS_OP_RMXATTR: return "rmxattr"; + case CEPH_MDS_OP_SETLAYOUT: return "setlayou"; + case CEPH_MDS_OP_SETDIRLAYOUT: return "setdirlayout"; + case CEPH_MDS_OP_READDIR: return "readdir"; + case CEPH_MDS_OP_MKNOD: return "mknod"; + case CEPH_MDS_OP_LINK: return "link"; + case CEPH_MDS_OP_UNLINK: return "unlink"; + case CEPH_MDS_OP_RENAME: return "rename"; + case CEPH_MDS_OP_MKDIR: return "mkdir"; + case CEPH_MDS_OP_RMDIR: return "rmdir"; + case CEPH_MDS_OP_SYMLINK: return "symlink"; + case CEPH_MDS_OP_CREATE: return "create"; + case CEPH_MDS_OP_OPEN: return "open"; + case CEPH_MDS_OP_LOOKUPSNAP: return "lookupsnap"; + case CEPH_MDS_OP_LSSNAP: return "lssnap"; + case CEPH_MDS_OP_MKSNAP: return "mksnap"; + case CEPH_MDS_OP_RMSNAP: return "rmsnap"; + case CEPH_MDS_OP_RENAMESNAP: return "renamesnap"; + case CEPH_MDS_OP_SETFILELOCK: return "setfilelock"; + case CEPH_MDS_OP_GETFILELOCK: return "getfilelock"; + } + return "???"; +} + +const char *ceph_cap_op_name(int op) +{ + switch (op) { + case CEPH_CAP_OP_GRANT: return "grant"; + case CEPH_CAP_OP_REVOKE: return "revoke"; + case CEPH_CAP_OP_TRUNC: return "trunc"; + case CEPH_CAP_OP_EXPORT: return "export"; + case CEPH_CAP_OP_IMPORT: return "import"; + case CEPH_CAP_OP_UPDATE: return "update"; + case CEPH_CAP_OP_DROP: return "drop"; + case CEPH_CAP_OP_FLUSH: return "flush"; + case CEPH_CAP_OP_FLUSH_ACK: return "flush_ack"; + case CEPH_CAP_OP_FLUSHSNAP: return "flushsnap"; + case CEPH_CAP_OP_FLUSHSNAP_ACK: return "flushsnap_ack"; + case CEPH_CAP_OP_RELEASE: return "release"; + case CEPH_CAP_OP_RENEW: return "renew"; + } + return "???"; +} + +const char *ceph_lease_op_name(int o) +{ + switch (o) { + case CEPH_MDS_LEASE_REVOKE: return "revoke"; + case CEPH_MDS_LEASE_RELEASE: return "release"; + case CEPH_MDS_LEASE_RENEW: return "renew"; + case CEPH_MDS_LEASE_REVOKE_ACK: return "revoke_ack"; + } + return "???"; +} + +const char *ceph_snap_op_name(int o) +{ + switch (o) { + case CEPH_SNAP_OP_UPDATE: return "update"; + case CEPH_SNAP_OP_CREATE: return "create"; + case CEPH_SNAP_OP_DESTROY: return "destroy"; + case CEPH_SNAP_OP_SPLIT: return "split"; + } + return "???"; +} diff --git a/kernel/fs/ceph/super.c b/kernel/fs/ceph/super.c new file mode 100644 index 000000000..4e9905374 --- /dev/null +++ b/kernel/fs/ceph/super.c @@ -0,0 +1,1059 @@ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "super.h" +#include "mds_client.h" +#include "cache.h" + +#include +#include +#include +#include +#include + +/* + * Ceph superblock operations + * + * Handle the basics of mounting, unmounting. + */ + +/* + * super ops + */ +static void ceph_put_super(struct super_block *s) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(s); + + dout("put_super\n"); + ceph_mdsc_close_sessions(fsc->mdsc); +} + +static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry)); + struct ceph_monmap *monmap = fsc->client->monc.monmap; + struct ceph_statfs st; + u64 fsid; + int err; + + dout("statfs\n"); + err = ceph_monc_do_statfs(&fsc->client->monc, &st); + if (err < 0) + return err; + + /* fill in kstatfs */ + buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ + + /* + * express utilization in terms of large blocks to avoid + * overflow on 32-bit machines. + * + * NOTE: for the time being, we make bsize == frsize to humor + * not-yet-ancient versions of glibc that are broken. + * Someday, we will probably want to report a real block + * size... whatever that may mean for a network file system! + */ + buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; + buf->f_frsize = 1 << CEPH_BLOCK_SHIFT; + buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); + buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); + buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); + + buf->f_files = le64_to_cpu(st.num_objects); + buf->f_ffree = -1; + buf->f_namelen = NAME_MAX; + + /* leave fsid little-endian, regardless of host endianness */ + fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); + buf->f_fsid.val[0] = fsid & 0xffffffff; + buf->f_fsid.val[1] = fsid >> 32; + + return 0; +} + + +static int ceph_sync_fs(struct super_block *sb, int wait) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(sb); + + if (!wait) { + dout("sync_fs (non-blocking)\n"); + ceph_flush_dirty_caps(fsc->mdsc); + dout("sync_fs (non-blocking) done\n"); + return 0; + } + + dout("sync_fs (blocking)\n"); + ceph_osdc_sync(&fsc->client->osdc); + ceph_mdsc_sync(fsc->mdsc); + dout("sync_fs (blocking) done\n"); + return 0; +} + +/* + * mount options + */ +enum { + Opt_wsize, + Opt_rsize, + Opt_rasize, + Opt_caps_wanted_delay_min, + Opt_caps_wanted_delay_max, + Opt_cap_release_safety, + Opt_readdir_max_entries, + Opt_readdir_max_bytes, + Opt_congestion_kb, + Opt_last_int, + /* int args above */ + Opt_snapdirname, + Opt_last_string, + /* string args above */ + Opt_dirstat, + Opt_nodirstat, + Opt_rbytes, + Opt_norbytes, + Opt_asyncreaddir, + Opt_noasyncreaddir, + Opt_dcache, + Opt_nodcache, + Opt_ino32, + Opt_noino32, + Opt_fscache, + Opt_nofscache, +#ifdef CONFIG_CEPH_FS_POSIX_ACL + Opt_acl, +#endif + Opt_noacl +}; + +static match_table_t fsopt_tokens = { + {Opt_wsize, "wsize=%d"}, + {Opt_rsize, "rsize=%d"}, + {Opt_rasize, "rasize=%d"}, + {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, + {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, + {Opt_cap_release_safety, "cap_release_safety=%d"}, + {Opt_readdir_max_entries, "readdir_max_entries=%d"}, + {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, + {Opt_congestion_kb, "write_congestion_kb=%d"}, + /* int args above */ + {Opt_snapdirname, "snapdirname=%s"}, + /* string args above */ + {Opt_dirstat, "dirstat"}, + {Opt_nodirstat, "nodirstat"}, + {Opt_rbytes, "rbytes"}, + {Opt_norbytes, "norbytes"}, + {Opt_asyncreaddir, "asyncreaddir"}, + {Opt_noasyncreaddir, "noasyncreaddir"}, + {Opt_dcache, "dcache"}, + {Opt_nodcache, "nodcache"}, + {Opt_ino32, "ino32"}, + {Opt_noino32, "noino32"}, + {Opt_fscache, "fsc"}, + {Opt_nofscache, "nofsc"}, +#ifdef CONFIG_CEPH_FS_POSIX_ACL + {Opt_acl, "acl"}, +#endif + {Opt_noacl, "noacl"}, + {-1, NULL} +}; + +static int parse_fsopt_token(char *c, void *private) +{ + struct ceph_mount_options *fsopt = private; + substring_t argstr[MAX_OPT_ARGS]; + int token, intval, ret; + + token = match_token((char *)c, fsopt_tokens, argstr); + if (token < 0) + return -EINVAL; + + if (token < Opt_last_int) { + ret = match_int(&argstr[0], &intval); + if (ret < 0) { + pr_err("bad mount option arg (not int) " + "at '%s'\n", c); + return ret; + } + dout("got int token %d val %d\n", token, intval); + } else if (token > Opt_last_int && token < Opt_last_string) { + dout("got string token %d val %s\n", token, + argstr[0].from); + } else { + dout("got token %d\n", token); + } + + switch (token) { + case Opt_snapdirname: + kfree(fsopt->snapdir_name); + fsopt->snapdir_name = kstrndup(argstr[0].from, + argstr[0].to-argstr[0].from, + GFP_KERNEL); + if (!fsopt->snapdir_name) + return -ENOMEM; + break; + + /* misc */ + case Opt_wsize: + fsopt->wsize = intval; + break; + case Opt_rsize: + fsopt->rsize = intval; + break; + case Opt_rasize: + fsopt->rasize = intval; + break; + case Opt_caps_wanted_delay_min: + fsopt->caps_wanted_delay_min = intval; + break; + case Opt_caps_wanted_delay_max: + fsopt->caps_wanted_delay_max = intval; + break; + case Opt_readdir_max_entries: + fsopt->max_readdir = intval; + break; + case Opt_readdir_max_bytes: + fsopt->max_readdir_bytes = intval; + break; + case Opt_congestion_kb: + fsopt->congestion_kb = intval; + break; + case Opt_dirstat: + fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; + break; + case Opt_nodirstat: + fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; + break; + case Opt_rbytes: + fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; + break; + case Opt_norbytes: + fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; + break; + case Opt_asyncreaddir: + fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; + break; + case Opt_noasyncreaddir: + fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; + break; + case Opt_dcache: + fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; + break; + case Opt_nodcache: + fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; + break; + case Opt_ino32: + fsopt->flags |= CEPH_MOUNT_OPT_INO32; + break; + case Opt_noino32: + fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; + break; + case Opt_fscache: + fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; + break; + case Opt_nofscache: + fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; + break; +#ifdef CONFIG_CEPH_FS_POSIX_ACL + case Opt_acl: + fsopt->sb_flags |= MS_POSIXACL; + break; +#endif + case Opt_noacl: + fsopt->sb_flags &= ~MS_POSIXACL; + break; + default: + BUG_ON(token); + } + return 0; +} + +static void destroy_mount_options(struct ceph_mount_options *args) +{ + dout("destroy_mount_options %p\n", args); + kfree(args->snapdir_name); + kfree(args); +} + +static int strcmp_null(const char *s1, const char *s2) +{ + if (!s1 && !s2) + return 0; + if (s1 && !s2) + return -1; + if (!s1 && s2) + return 1; + return strcmp(s1, s2); +} + +static int compare_mount_options(struct ceph_mount_options *new_fsopt, + struct ceph_options *new_opt, + struct ceph_fs_client *fsc) +{ + struct ceph_mount_options *fsopt1 = new_fsopt; + struct ceph_mount_options *fsopt2 = fsc->mount_options; + int ofs = offsetof(struct ceph_mount_options, snapdir_name); + int ret; + + ret = memcmp(fsopt1, fsopt2, ofs); + if (ret) + return ret; + + ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); + if (ret) + return ret; + + return ceph_compare_options(new_opt, fsc->client); +} + +static int parse_mount_options(struct ceph_mount_options **pfsopt, + struct ceph_options **popt, + int flags, char *options, + const char *dev_name, + const char **path) +{ + struct ceph_mount_options *fsopt; + const char *dev_name_end; + int err; + + if (!dev_name || !*dev_name) + return -EINVAL; + + fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); + if (!fsopt) + return -ENOMEM; + + dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); + + fsopt->sb_flags = flags; + fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; + + fsopt->rsize = CEPH_RSIZE_DEFAULT; + fsopt->rasize = CEPH_RASIZE_DEFAULT; + fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); + if (!fsopt->snapdir_name) { + err = -ENOMEM; + goto out; + } + + fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; + fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; + fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; + fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; + fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; + fsopt->congestion_kb = default_congestion_kb(); + + /* + * Distinguish the server list from the path in "dev_name". + * Internally we do not include the leading '/' in the path. + * + * "dev_name" will look like: + * [,...]:[] + * where + * is [:] + * is optional, but if present must begin with '/' + */ + dev_name_end = strchr(dev_name, '/'); + if (dev_name_end) { + /* skip over leading '/' for path */ + *path = dev_name_end + 1; + } else { + /* path is empty */ + dev_name_end = dev_name + strlen(dev_name); + *path = dev_name_end; + } + err = -EINVAL; + dev_name_end--; /* back up to ':' separator */ + if (dev_name_end < dev_name || *dev_name_end != ':') { + pr_err("device name is missing path (no : separator in %s)\n", + dev_name); + goto out; + } + dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); + dout("server path '%s'\n", *path); + + *popt = ceph_parse_options(options, dev_name, dev_name_end, + parse_fsopt_token, (void *)fsopt); + if (IS_ERR(*popt)) { + err = PTR_ERR(*popt); + goto out; + } + + /* success */ + *pfsopt = fsopt; + return 0; + +out: + destroy_mount_options(fsopt); + return err; +} + +/** + * ceph_show_options - Show mount options in /proc/mounts + * @m: seq_file to write to + * @root: root of that (sub)tree + */ +static int ceph_show_options(struct seq_file *m, struct dentry *root) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); + struct ceph_mount_options *fsopt = fsc->mount_options; + size_t pos; + int ret; + + /* a comma between MNT/MS and client options */ + seq_putc(m, ','); + pos = m->count; + + ret = ceph_print_client_options(m, fsc->client); + if (ret) + return ret; + + /* retract our comma if no client options */ + if (m->count == pos) + m->count--; + + if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) + seq_puts(m, ",dirstat"); + if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) + seq_puts(m, ",norbytes"); + if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) + seq_puts(m, ",noasyncreaddir"); + if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) + seq_puts(m, ",nodcache"); + if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) + seq_puts(m, ",fsc"); + +#ifdef CONFIG_CEPH_FS_POSIX_ACL + if (fsopt->sb_flags & MS_POSIXACL) + seq_puts(m, ",acl"); + else + seq_puts(m, ",noacl"); +#endif + + if (fsopt->wsize) + seq_printf(m, ",wsize=%d", fsopt->wsize); + if (fsopt->rsize != CEPH_RSIZE_DEFAULT) + seq_printf(m, ",rsize=%d", fsopt->rsize); + if (fsopt->rasize != CEPH_RASIZE_DEFAULT) + seq_printf(m, ",rasize=%d", fsopt->rasize); + if (fsopt->congestion_kb != default_congestion_kb()) + seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); + if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) + seq_printf(m, ",caps_wanted_delay_min=%d", + fsopt->caps_wanted_delay_min); + if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) + seq_printf(m, ",caps_wanted_delay_max=%d", + fsopt->caps_wanted_delay_max); + if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) + seq_printf(m, ",cap_release_safety=%d", + fsopt->cap_release_safety); + if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) + seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); + if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) + seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); + if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) + seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name); + + return 0; +} + +/* + * handle any mon messages the standard library doesn't understand. + * return error if we don't either. + */ +static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) +{ + struct ceph_fs_client *fsc = client->private; + int type = le16_to_cpu(msg->hdr.type); + + switch (type) { + case CEPH_MSG_MDS_MAP: + ceph_mdsc_handle_map(fsc->mdsc, msg); + return 0; + + default: + return -1; + } +} + +/* + * create a new fs client + */ +static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, + struct ceph_options *opt) +{ + struct ceph_fs_client *fsc; + const u64 supported_features = + CEPH_FEATURE_FLOCK | + CEPH_FEATURE_DIRLAYOUTHASH | + CEPH_FEATURE_MDS_INLINE_DATA; + const u64 required_features = 0; + int page_count; + size_t size; + int err = -ENOMEM; + + fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); + if (!fsc) + return ERR_PTR(-ENOMEM); + + fsc->client = ceph_create_client(opt, fsc, supported_features, + required_features); + if (IS_ERR(fsc->client)) { + err = PTR_ERR(fsc->client); + goto fail; + } + fsc->client->extra_mon_dispatch = extra_mon_dispatch; + fsc->client->monc.want_mdsmap = 1; + + fsc->mount_options = fsopt; + + fsc->sb = NULL; + fsc->mount_state = CEPH_MOUNT_MOUNTING; + + atomic_long_set(&fsc->writeback_count, 0); + + err = bdi_init(&fsc->backing_dev_info); + if (err < 0) + goto fail_client; + + err = -ENOMEM; + /* + * The number of concurrent works can be high but they don't need + * to be processed in parallel, limit concurrency. + */ + fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); + if (fsc->wb_wq == NULL) + goto fail_bdi; + fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); + if (fsc->pg_inv_wq == NULL) + goto fail_wb_wq; + fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); + if (fsc->trunc_wq == NULL) + goto fail_pg_inv_wq; + + /* set up mempools */ + err = -ENOMEM; + page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT; + size = sizeof (struct page *) * (page_count ? page_count : 1); + fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); + if (!fsc->wb_pagevec_pool) + goto fail_trunc_wq; + + /* setup fscache */ + if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && + (ceph_fscache_register_fs(fsc) != 0)) + goto fail_fscache; + + /* caps */ + fsc->min_caps = fsopt->max_readdir; + + return fsc; + +fail_fscache: + ceph_fscache_unregister_fs(fsc); +fail_trunc_wq: + destroy_workqueue(fsc->trunc_wq); +fail_pg_inv_wq: + destroy_workqueue(fsc->pg_inv_wq); +fail_wb_wq: + destroy_workqueue(fsc->wb_wq); +fail_bdi: + bdi_destroy(&fsc->backing_dev_info); +fail_client: + ceph_destroy_client(fsc->client); +fail: + kfree(fsc); + return ERR_PTR(err); +} + +static void destroy_fs_client(struct ceph_fs_client *fsc) +{ + dout("destroy_fs_client %p\n", fsc); + + ceph_fscache_unregister_fs(fsc); + + destroy_workqueue(fsc->wb_wq); + destroy_workqueue(fsc->pg_inv_wq); + destroy_workqueue(fsc->trunc_wq); + + bdi_destroy(&fsc->backing_dev_info); + + mempool_destroy(fsc->wb_pagevec_pool); + + destroy_mount_options(fsc->mount_options); + + ceph_fs_debugfs_cleanup(fsc); + + ceph_destroy_client(fsc->client); + + kfree(fsc); + dout("destroy_fs_client %p done\n", fsc); +} + +/* + * caches + */ +struct kmem_cache *ceph_inode_cachep; +struct kmem_cache *ceph_cap_cachep; +struct kmem_cache *ceph_dentry_cachep; +struct kmem_cache *ceph_file_cachep; + +static void ceph_inode_init_once(void *foo) +{ + struct ceph_inode_info *ci = foo; + inode_init_once(&ci->vfs_inode); +} + +static int __init init_caches(void) +{ + int error = -ENOMEM; + + ceph_inode_cachep = kmem_cache_create("ceph_inode_info", + sizeof(struct ceph_inode_info), + __alignof__(struct ceph_inode_info), + (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), + ceph_inode_init_once); + if (ceph_inode_cachep == NULL) + return -ENOMEM; + + ceph_cap_cachep = KMEM_CACHE(ceph_cap, + SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); + if (ceph_cap_cachep == NULL) + goto bad_cap; + + ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, + SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); + if (ceph_dentry_cachep == NULL) + goto bad_dentry; + + ceph_file_cachep = KMEM_CACHE(ceph_file_info, + SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); + if (ceph_file_cachep == NULL) + goto bad_file; + + if ((error = ceph_fscache_register())) + goto bad_file; + + return 0; +bad_file: + kmem_cache_destroy(ceph_dentry_cachep); +bad_dentry: + kmem_cache_destroy(ceph_cap_cachep); +bad_cap: + kmem_cache_destroy(ceph_inode_cachep); + return error; +} + +static void destroy_caches(void) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + + kmem_cache_destroy(ceph_inode_cachep); + kmem_cache_destroy(ceph_cap_cachep); + kmem_cache_destroy(ceph_dentry_cachep); + kmem_cache_destroy(ceph_file_cachep); + + ceph_fscache_unregister(); +} + + +/* + * ceph_umount_begin - initiate forced umount. Tear down down the + * mount, skipping steps that may hang while waiting for server(s). + */ +static void ceph_umount_begin(struct super_block *sb) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(sb); + + dout("ceph_umount_begin - starting forced umount\n"); + if (!fsc) + return; + fsc->mount_state = CEPH_MOUNT_SHUTDOWN; + return; +} + +static const struct super_operations ceph_super_ops = { + .alloc_inode = ceph_alloc_inode, + .destroy_inode = ceph_destroy_inode, + .write_inode = ceph_write_inode, + .drop_inode = ceph_drop_inode, + .sync_fs = ceph_sync_fs, + .put_super = ceph_put_super, + .show_options = ceph_show_options, + .statfs = ceph_statfs, + .umount_begin = ceph_umount_begin, +}; + +/* + * Bootstrap mount by opening the root directory. Note the mount + * @started time from caller, and time out if this takes too long. + */ +static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, + const char *path, + unsigned long started) +{ + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req = NULL; + int err; + struct dentry *root; + + /* open dir */ + dout("open_root_inode opening '%s'\n", path); + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); + if (IS_ERR(req)) + return ERR_CAST(req); + req->r_path1 = kstrdup(path, GFP_NOFS); + if (!req->r_path1) { + root = ERR_PTR(-ENOMEM); + goto out; + } + + req->r_ino1.ino = CEPH_INO_ROOT; + req->r_ino1.snap = CEPH_NOSNAP; + req->r_started = started; + req->r_timeout = fsc->client->options->mount_timeout * HZ; + req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); + req->r_num_caps = 2; + err = ceph_mdsc_do_request(mdsc, NULL, req); + if (err == 0) { + struct inode *inode = req->r_target_inode; + req->r_target_inode = NULL; + dout("open_root_inode success\n"); + if (ceph_ino(inode) == CEPH_INO_ROOT && + fsc->sb->s_root == NULL) { + root = d_make_root(inode); + if (!root) { + root = ERR_PTR(-ENOMEM); + goto out; + } + } else { + root = d_obtain_root(inode); + } + ceph_init_dentry(root); + dout("open_root_inode success, root dentry is %p\n", root); + } else { + root = ERR_PTR(err); + } +out: + ceph_mdsc_put_request(req); + return root; +} + + + + +/* + * mount: join the ceph cluster, and open root directory. + */ +static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, + const char *path) +{ + int err; + unsigned long started = jiffies; /* note the start time */ + struct dentry *root; + int first = 0; /* first vfsmount for this super_block */ + + dout("mount start\n"); + mutex_lock(&fsc->client->mount_mutex); + + err = __ceph_open_session(fsc->client, started); + if (err < 0) + goto out; + + dout("mount opening root\n"); + root = open_root_dentry(fsc, "", started); + if (IS_ERR(root)) { + err = PTR_ERR(root); + goto out; + } + if (fsc->sb->s_root) { + dput(root); + } else { + fsc->sb->s_root = root; + first = 1; + + err = ceph_fs_debugfs_init(fsc); + if (err < 0) + goto fail; + } + + if (path[0] == 0) { + dget(root); + } else { + dout("mount opening base mountpoint\n"); + root = open_root_dentry(fsc, path, started); + if (IS_ERR(root)) { + err = PTR_ERR(root); + goto fail; + } + } + + fsc->mount_state = CEPH_MOUNT_MOUNTED; + dout("mount success\n"); + mutex_unlock(&fsc->client->mount_mutex); + return root; + +out: + mutex_unlock(&fsc->client->mount_mutex); + return ERR_PTR(err); + +fail: + if (first) { + dput(fsc->sb->s_root); + fsc->sb->s_root = NULL; + } + goto out; +} + +static int ceph_set_super(struct super_block *s, void *data) +{ + struct ceph_fs_client *fsc = data; + int ret; + + dout("set_super %p data %p\n", s, data); + + s->s_flags = fsc->mount_options->sb_flags; + s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ + + s->s_xattr = ceph_xattr_handlers; + s->s_fs_info = fsc; + fsc->sb = s; + + s->s_op = &ceph_super_ops; + s->s_export_op = &ceph_export_ops; + + s->s_time_gran = 1000; /* 1000 ns == 1 us */ + + ret = set_anon_super(s, NULL); /* what is that second arg for? */ + if (ret != 0) + goto fail; + + return ret; + +fail: + s->s_fs_info = NULL; + fsc->sb = NULL; + return ret; +} + +/* + * share superblock if same fs AND options + */ +static int ceph_compare_super(struct super_block *sb, void *data) +{ + struct ceph_fs_client *new = data; + struct ceph_mount_options *fsopt = new->mount_options; + struct ceph_options *opt = new->client->options; + struct ceph_fs_client *other = ceph_sb_to_client(sb); + + dout("ceph_compare_super %p\n", sb); + + if (compare_mount_options(fsopt, opt, other)) { + dout("monitor(s)/mount options don't match\n"); + return 0; + } + if ((opt->flags & CEPH_OPT_FSID) && + ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { + dout("fsid doesn't match\n"); + return 0; + } + if (fsopt->sb_flags != other->mount_options->sb_flags) { + dout("flags differ\n"); + return 0; + } + return 1; +} + +/* + * construct our own bdi so we can control readahead, etc. + */ +static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); + +static int ceph_register_bdi(struct super_block *sb, + struct ceph_fs_client *fsc) +{ + int err; + + /* set ra_pages based on rasize mount option? */ + if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) + fsc->backing_dev_info.ra_pages = + (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) + >> PAGE_SHIFT; + else + fsc->backing_dev_info.ra_pages = + VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE; + + err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", + atomic_long_inc_return(&bdi_seq)); + if (!err) + sb->s_bdi = &fsc->backing_dev_info; + return err; +} + +static struct dentry *ceph_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + struct super_block *sb; + struct ceph_fs_client *fsc; + struct dentry *res; + int err; + int (*compare_super)(struct super_block *, void *) = ceph_compare_super; + const char *path = NULL; + struct ceph_mount_options *fsopt = NULL; + struct ceph_options *opt = NULL; + + dout("ceph_mount\n"); + +#ifdef CONFIG_CEPH_FS_POSIX_ACL + flags |= MS_POSIXACL; +#endif + err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); + if (err < 0) { + res = ERR_PTR(err); + goto out_final; + } + + /* create client (which we may/may not use) */ + fsc = create_fs_client(fsopt, opt); + if (IS_ERR(fsc)) { + res = ERR_CAST(fsc); + destroy_mount_options(fsopt); + ceph_destroy_options(opt); + goto out_final; + } + + err = ceph_mdsc_init(fsc); + if (err < 0) { + res = ERR_PTR(err); + goto out; + } + + if (ceph_test_opt(fsc->client, NOSHARE)) + compare_super = NULL; + sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); + if (IS_ERR(sb)) { + res = ERR_CAST(sb); + goto out; + } + + if (ceph_sb_to_client(sb) != fsc) { + ceph_mdsc_destroy(fsc); + destroy_fs_client(fsc); + fsc = ceph_sb_to_client(sb); + dout("get_sb got existing client %p\n", fsc); + } else { + dout("get_sb using new client %p\n", fsc); + err = ceph_register_bdi(sb, fsc); + if (err < 0) { + res = ERR_PTR(err); + goto out_splat; + } + } + + res = ceph_real_mount(fsc, path); + if (IS_ERR(res)) + goto out_splat; + dout("root %p inode %p ino %llx.%llx\n", res, + d_inode(res), ceph_vinop(d_inode(res))); + return res; + +out_splat: + ceph_mdsc_close_sessions(fsc->mdsc); + deactivate_locked_super(sb); + goto out_final; + +out: + ceph_mdsc_destroy(fsc); + destroy_fs_client(fsc); +out_final: + dout("ceph_mount fail %ld\n", PTR_ERR(res)); + return res; +} + +static void ceph_kill_sb(struct super_block *s) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(s); + dev_t dev = s->s_dev; + + dout("kill_sb %p\n", s); + + ceph_mdsc_pre_umount(fsc->mdsc); + generic_shutdown_super(s); + ceph_mdsc_destroy(fsc); + + destroy_fs_client(fsc); + free_anon_bdev(dev); +} + +static struct file_system_type ceph_fs_type = { + .owner = THIS_MODULE, + .name = "ceph", + .mount = ceph_mount, + .kill_sb = ceph_kill_sb, + .fs_flags = FS_RENAME_DOES_D_MOVE, +}; +MODULE_ALIAS_FS("ceph"); + +static int __init init_ceph(void) +{ + int ret = init_caches(); + if (ret) + goto out; + + ceph_flock_init(); + ceph_xattr_init(); + ret = ceph_snap_init(); + if (ret) + goto out_xattr; + ret = register_filesystem(&ceph_fs_type); + if (ret) + goto out_snap; + + pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); + + return 0; + +out_snap: + ceph_snap_exit(); +out_xattr: + ceph_xattr_exit(); + destroy_caches(); +out: + return ret; +} + +static void __exit exit_ceph(void) +{ + dout("exit_ceph\n"); + unregister_filesystem(&ceph_fs_type); + ceph_snap_exit(); + ceph_xattr_exit(); + destroy_caches(); +} + +module_init(init_ceph); +module_exit(exit_ceph); + +MODULE_AUTHOR("Sage Weil "); +MODULE_AUTHOR("Yehuda Sadeh "); +MODULE_AUTHOR("Patience Warnick "); +MODULE_DESCRIPTION("Ceph filesystem for Linux"); +MODULE_LICENSE("GPL"); diff --git a/kernel/fs/ceph/super.h b/kernel/fs/ceph/super.h new file mode 100644 index 000000000..fa20e1318 --- /dev/null +++ b/kernel/fs/ceph/super.h @@ -0,0 +1,946 @@ +#ifndef _FS_CEPH_SUPER_H +#define _FS_CEPH_SUPER_H + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#ifdef CONFIG_CEPH_FSCACHE +#include +#endif + +/* f_type in struct statfs */ +#define CEPH_SUPER_MAGIC 0x00c36400 + +/* large granularity for statfs utilization stats to facilitate + * large volume sizes on 32-bit machines. */ +#define CEPH_BLOCK_SHIFT 22 /* 4 MB */ +#define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) + +#define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */ +#define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ +#define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ +#define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */ +#define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */ +#define CEPH_MOUNT_OPT_FSCACHE (1<<10) /* use fscache */ + +#define CEPH_MOUNT_OPT_DEFAULT (CEPH_MOUNT_OPT_RBYTES | \ + CEPH_MOUNT_OPT_DCACHE) + +#define ceph_set_mount_opt(fsc, opt) \ + (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; +#define ceph_test_mount_opt(fsc, opt) \ + (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) + +#define CEPH_RSIZE_DEFAULT 0 /* max read size */ +#define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */ +#define CEPH_MAX_READDIR_DEFAULT 1024 +#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) +#define CEPH_SNAPDIRNAME_DEFAULT ".snap" + +struct ceph_mount_options { + int flags; + int sb_flags; + + int wsize; /* max write size */ + int rsize; /* max read size */ + int rasize; /* max readahead */ + int congestion_kb; /* max writeback in flight */ + int caps_wanted_delay_min, caps_wanted_delay_max; + int cap_release_safety; + int max_readdir; /* max readdir result (entires) */ + int max_readdir_bytes; /* max readdir result (bytes) */ + + /* + * everything above this point can be memcmp'd; everything below + * is handled in compare_mount_options() + */ + + char *snapdir_name; /* default ".snap" */ +}; + +struct ceph_fs_client { + struct super_block *sb; + + struct ceph_mount_options *mount_options; + struct ceph_client *client; + + unsigned long mount_state; + int min_caps; /* min caps i added */ + + struct ceph_mds_client *mdsc; + + /* writeback */ + mempool_t *wb_pagevec_pool; + struct workqueue_struct *wb_wq; + struct workqueue_struct *pg_inv_wq; + struct workqueue_struct *trunc_wq; + atomic_long_t writeback_count; + + struct backing_dev_info backing_dev_info; + +#ifdef CONFIG_DEBUG_FS + struct dentry *debugfs_dentry_lru, *debugfs_caps; + struct dentry *debugfs_congestion_kb; + struct dentry *debugfs_bdi; + struct dentry *debugfs_mdsc, *debugfs_mdsmap; + struct dentry *debugfs_mds_sessions; +#endif + +#ifdef CONFIG_CEPH_FSCACHE + struct fscache_cookie *fscache; + struct workqueue_struct *revalidate_wq; +#endif +}; + + +/* + * File i/o capability. This tracks shared state with the metadata + * server that allows us to cache or writeback attributes or to read + * and write data. For any given inode, we should have one or more + * capabilities, one issued by each metadata server, and our + * cumulative access is the OR of all issued capabilities. + * + * Each cap is referenced by the inode's i_caps rbtree and by per-mds + * session capability lists. + */ +struct ceph_cap { + struct ceph_inode_info *ci; + struct rb_node ci_node; /* per-ci cap tree */ + struct ceph_mds_session *session; + struct list_head session_caps; /* per-session caplist */ + int mds; + u64 cap_id; /* unique cap id (mds provided) */ + int issued; /* latest, from the mds */ + int implemented; /* implemented superset of issued (for revocation) */ + int mds_wanted; + u32 seq, issue_seq, mseq; + u32 cap_gen; /* active/stale cycle */ + unsigned long last_used; + struct list_head caps_item; +}; + +#define CHECK_CAPS_NODELAY 1 /* do not delay any further */ +#define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ +#define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ + +/* + * Snapped cap state that is pending flush to mds. When a snapshot occurs, + * we first complete any in-process sync writes and writeback any dirty + * data before flushing the snapped state (tracked here) back to the MDS. + */ +struct ceph_cap_snap { + atomic_t nref; + struct ceph_inode_info *ci; + struct list_head ci_item, flushing_item; + + u64 follows, flush_tid; + int issued, dirty; + struct ceph_snap_context *context; + + umode_t mode; + kuid_t uid; + kgid_t gid; + + struct ceph_buffer *xattr_blob; + u64 xattr_version; + + u64 size; + struct timespec mtime, atime, ctime; + u64 time_warp_seq; + int writing; /* a sync write is still in progress */ + int dirty_pages; /* dirty pages awaiting writeback */ + bool inline_data; +}; + +static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) +{ + if (atomic_dec_and_test(&capsnap->nref)) { + if (capsnap->xattr_blob) + ceph_buffer_put(capsnap->xattr_blob); + kfree(capsnap); + } +} + +/* + * The frag tree describes how a directory is fragmented, potentially across + * multiple metadata servers. It is also used to indicate points where + * metadata authority is delegated, and whether/where metadata is replicated. + * + * A _leaf_ frag will be present in the i_fragtree IFF there is + * delegation info. That is, if mds >= 0 || ndist > 0. + */ +#define CEPH_MAX_DIRFRAG_REP 4 + +struct ceph_inode_frag { + struct rb_node node; + + /* fragtree state */ + u32 frag; + int split_by; /* i.e. 2^(split_by) children */ + + /* delegation and replication info */ + int mds; /* -1 if same authority as parent */ + int ndist; /* >0 if replicated */ + int dist[CEPH_MAX_DIRFRAG_REP]; +}; + +/* + * We cache inode xattrs as an encoded blob until they are first used, + * at which point we parse them into an rbtree. + */ +struct ceph_inode_xattr { + struct rb_node node; + + const char *name; + int name_len; + const char *val; + int val_len; + int dirty; + + int should_free_name; + int should_free_val; +}; + +/* + * Ceph dentry state + */ +struct ceph_dentry_info { + struct ceph_mds_session *lease_session; + u32 lease_gen, lease_shared_gen; + u32 lease_seq; + unsigned long lease_renew_after, lease_renew_from; + struct list_head lru; + struct dentry *dentry; + u64 time; + u64 offset; +}; + +struct ceph_inode_xattrs_info { + /* + * (still encoded) xattr blob. we avoid the overhead of parsing + * this until someone actually calls getxattr, etc. + * + * blob->vec.iov_len == 4 implies there are no xattrs; blob == + * NULL means we don't know. + */ + struct ceph_buffer *blob, *prealloc_blob; + + struct rb_root index; + bool dirty; + int count; + int names_size; + int vals_size; + u64 version, index_version; +}; + +/* + * Ceph inode. + */ +struct ceph_inode_info { + struct ceph_vino i_vino; /* ceph ino + snap */ + + spinlock_t i_ceph_lock; + + u64 i_version; + u64 i_inline_version; + u32 i_time_warp_seq; + + unsigned i_ceph_flags; + int i_ordered_count; + atomic_t i_release_count; + atomic_t i_complete_count; + + struct ceph_dir_layout i_dir_layout; + struct ceph_file_layout i_layout; + char *i_symlink; + + /* for dirs */ + struct timespec i_rctime; + u64 i_rbytes, i_rfiles, i_rsubdirs; + u64 i_files, i_subdirs; + + struct rb_root i_fragtree; + struct mutex i_fragtree_mutex; + + struct ceph_inode_xattrs_info i_xattrs; + + /* capabilities. protected _both_ by i_ceph_lock and cap->session's + * s_mutex. */ + struct rb_root i_caps; /* cap list */ + struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ + unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ + struct list_head i_dirty_item, i_flushing_item; + u64 i_cap_flush_seq; + /* we need to track cap writeback on a per-cap-bit basis, to allow + * overlapping, pipelined cap flushes to the mds. we can probably + * reduce the tid to 8 bits if we're concerned about inode size. */ + u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; + wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ + unsigned long i_hold_caps_min; /* jiffies */ + unsigned long i_hold_caps_max; /* jiffies */ + struct list_head i_cap_delay_list; /* for delayed cap release to mds */ + struct ceph_cap_reservation i_cap_migration_resv; + struct list_head i_cap_snaps; /* snapped state pending flush to mds */ + struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or + dirty|flushing caps */ + unsigned i_snap_caps; /* cap bits for snapped files */ + + int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ + + struct mutex i_truncate_mutex; + u32 i_truncate_seq; /* last truncate to smaller size */ + u64 i_truncate_size; /* and the size we last truncated down to */ + int i_truncate_pending; /* still need to call vmtruncate */ + + u64 i_max_size; /* max file size authorized by mds */ + u64 i_reported_size; /* (max_)size reported to or requested of mds */ + u64 i_wanted_max_size; /* offset we'd like to write too */ + u64 i_requested_max_size; /* max_size we've requested */ + + /* held references to caps */ + int i_pin_ref; + int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; + int i_wrbuffer_ref, i_wrbuffer_ref_head; + u32 i_shared_gen; /* increment each time we get FILE_SHARED */ + u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ + u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ + + struct list_head i_unsafe_writes; /* uncommitted sync writes */ + struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ + spinlock_t i_unsafe_lock; + + struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ + int i_snap_realm_counter; /* snap realm (if caps) */ + struct list_head i_snap_realm_item; + struct list_head i_snap_flush_item; + + struct work_struct i_wb_work; /* writeback work */ + struct work_struct i_pg_inv_work; /* page invalidation work */ + + struct work_struct i_vmtruncate_work; + +#ifdef CONFIG_CEPH_FSCACHE + struct fscache_cookie *fscache; + u32 i_fscache_gen; /* sequence, for delayed fscache validate */ + struct work_struct i_revalidate_work; +#endif + struct inode vfs_inode; /* at end */ +}; + +static inline struct ceph_inode_info *ceph_inode(struct inode *inode) +{ + return container_of(inode, struct ceph_inode_info, vfs_inode); +} + +static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) +{ + return (struct ceph_fs_client *)inode->i_sb->s_fs_info; +} + +static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) +{ + return (struct ceph_fs_client *)sb->s_fs_info; +} + +static inline struct ceph_vino ceph_vino(struct inode *inode) +{ + return ceph_inode(inode)->i_vino; +} + +/* + * ino_t is <64 bits on many architectures, blech. + * + * i_ino (kernel inode) st_ino (userspace) + * i386 32 32 + * x86_64+ino32 64 32 + * x86_64 64 64 + */ +static inline u32 ceph_ino_to_ino32(__u64 vino) +{ + u32 ino = vino & 0xffffffff; + ino ^= vino >> 32; + if (!ino) + ino = 2; + return ino; +} + +/* + * kernel i_ino value + */ +static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) +{ +#if BITS_PER_LONG == 32 + return ceph_ino_to_ino32(vino.ino); +#else + return (ino_t)vino.ino; +#endif +} + +/* + * user-visible ino (stat, filldir) + */ +#if BITS_PER_LONG == 32 +static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) +{ + return ino; +} +#else +static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) +{ + if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) + ino = ceph_ino_to_ino32(ino); + return ino; +} +#endif + + +/* for printf-style formatting */ +#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap + +static inline u64 ceph_ino(struct inode *inode) +{ + return ceph_inode(inode)->i_vino.ino; +} +static inline u64 ceph_snap(struct inode *inode) +{ + return ceph_inode(inode)->i_vino.snap; +} + +static inline int ceph_ino_compare(struct inode *inode, void *data) +{ + struct ceph_vino *pvino = (struct ceph_vino *)data; + struct ceph_inode_info *ci = ceph_inode(inode); + return ci->i_vino.ino == pvino->ino && + ci->i_vino.snap == pvino->snap; +} + +static inline struct inode *ceph_find_inode(struct super_block *sb, + struct ceph_vino vino) +{ + ino_t t = ceph_vino_to_ino(vino); + return ilookup5(sb, t, ceph_ino_compare, &vino); +} + + +/* + * Ceph inode. + */ +#define CEPH_I_DIR_ORDERED 1 /* dentries in dir are ordered */ +#define CEPH_I_NODELAY 4 /* do not delay cap release */ +#define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ +#define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */ + +static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, + int release_count, int ordered_count) +{ + atomic_set(&ci->i_complete_count, release_count); + if (ci->i_ordered_count == ordered_count) + ci->i_ceph_flags |= CEPH_I_DIR_ORDERED; + else + ci->i_ceph_flags &= ~CEPH_I_DIR_ORDERED; +} + +static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) +{ + atomic_inc(&ci->i_release_count); +} + +static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) +{ + return atomic_read(&ci->i_complete_count) == + atomic_read(&ci->i_release_count); +} + +static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci) +{ + return __ceph_dir_is_complete(ci) && + (ci->i_ceph_flags & CEPH_I_DIR_ORDERED); +} + +static inline void ceph_dir_clear_complete(struct inode *inode) +{ + __ceph_dir_clear_complete(ceph_inode(inode)); +} + +static inline void ceph_dir_clear_ordered(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + spin_lock(&ci->i_ceph_lock); + ci->i_ordered_count++; + ci->i_ceph_flags &= ~CEPH_I_DIR_ORDERED; + spin_unlock(&ci->i_ceph_lock); +} + +static inline bool ceph_dir_is_complete_ordered(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + bool ret; + spin_lock(&ci->i_ceph_lock); + ret = __ceph_dir_is_complete_ordered(ci); + spin_unlock(&ci->i_ceph_lock); + return ret; +} + +/* find a specific frag @f */ +extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, + u32 f); + +/* + * choose fragment for value @v. copy frag content to pfrag, if leaf + * exists + */ +extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, + struct ceph_inode_frag *pfrag, + int *found); + +static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) +{ + return (struct ceph_dentry_info *)dentry->d_fsdata; +} + +static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) +{ + return ((loff_t)frag << 32) | (loff_t)off; +} + +/* + * caps helpers + */ +static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) +{ + return !RB_EMPTY_ROOT(&ci->i_caps); +} + +extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); +extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); +extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, + struct ceph_cap *cap); + +static inline int ceph_caps_issued(struct ceph_inode_info *ci) +{ + int issued; + spin_lock(&ci->i_ceph_lock); + issued = __ceph_caps_issued(ci, NULL); + spin_unlock(&ci->i_ceph_lock); + return issued; +} + +static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, + int touch) +{ + int r; + spin_lock(&ci->i_ceph_lock); + r = __ceph_caps_issued_mask(ci, mask, touch); + spin_unlock(&ci->i_ceph_lock); + return r; +} + +static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) +{ + return ci->i_dirty_caps | ci->i_flushing_caps; +} +extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); + +extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci, + struct ceph_cap *ocap, int mask); +extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); +extern int __ceph_caps_used(struct ceph_inode_info *ci); + +extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); + +/* + * wanted, by virtue of open file modes AND cap refs (buffered/cached data) + */ +static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) +{ + int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); + if (w & CEPH_CAP_FILE_BUFFER) + w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ + return w; +} + +/* what the mds thinks we want */ +extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); + +extern void ceph_caps_init(struct ceph_mds_client *mdsc); +extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); +extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); +extern void ceph_reserve_caps(struct ceph_mds_client *mdsc, + struct ceph_cap_reservation *ctx, int need); +extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, + struct ceph_cap_reservation *ctx); +extern void ceph_reservation_status(struct ceph_fs_client *client, + int *total, int *avail, int *used, + int *reserved, int *min); + + + +/* + * we keep buffered readdir results attached to file->private_data + */ +#define CEPH_F_SYNC 1 +#define CEPH_F_ATEND 2 + +struct ceph_file_info { + short fmode; /* initialized on open */ + short flags; /* CEPH_F_* */ + + /* readdir: position within the dir */ + u32 frag; + struct ceph_mds_request *last_readdir; + + /* readdir: position within a frag */ + unsigned offset; /* offset of last chunk, adjusted for . and .. */ + unsigned next_offset; /* offset of next chunk (last_name's + 1) */ + char *last_name; /* last entry in previous chunk */ + struct dentry *dentry; /* next dentry (for dcache readdir) */ + int dir_release_count; + int dir_ordered_count; + + /* used for -o dirstat read() on directory thing */ + char *dir_info; + int dir_info_len; +}; + + + +/* + * A "snap realm" describes a subset of the file hierarchy sharing + * the same set of snapshots that apply to it. The realms themselves + * are organized into a hierarchy, such that children inherit (some of) + * the snapshots of their parents. + * + * All inodes within the realm that have capabilities are linked into a + * per-realm list. + */ +struct ceph_snap_realm { + u64 ino; + atomic_t nref; + struct rb_node node; + + u64 created, seq; + u64 parent_ino; + u64 parent_since; /* snapid when our current parent became so */ + + u64 *prior_parent_snaps; /* snaps inherited from any parents we */ + u32 num_prior_parent_snaps; /* had prior to parent_since */ + u64 *snaps; /* snaps specific to this realm */ + u32 num_snaps; + + struct ceph_snap_realm *parent; + struct list_head children; /* list of child realms */ + struct list_head child_item; + + struct list_head empty_item; /* if i have ref==0 */ + + struct list_head dirty_item; /* if realm needs new context */ + + /* the current set of snaps for this realm */ + struct ceph_snap_context *cached_context; + + struct list_head inodes_with_caps; + spinlock_t inodes_with_caps_lock; +}; + +static inline int default_congestion_kb(void) +{ + int congestion_kb; + + /* + * Copied from NFS + * + * congestion size, scale with available memory. + * + * 64MB: 8192k + * 128MB: 11585k + * 256MB: 16384k + * 512MB: 23170k + * 1GB: 32768k + * 2GB: 46340k + * 4GB: 65536k + * 8GB: 92681k + * 16GB: 131072k + * + * This allows larger machines to have larger/more transfers. + * Limit the default to 256M + */ + congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); + if (congestion_kb > 256*1024) + congestion_kb = 256*1024; + + return congestion_kb; +} + + + +/* snap.c */ +struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, + u64 ino); +extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, + struct ceph_snap_realm *realm); +extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, + struct ceph_snap_realm *realm); +extern int ceph_update_snap_trace(struct ceph_mds_client *m, + void *p, void *e, bool deletion, + struct ceph_snap_realm **realm_ret); +extern void ceph_handle_snap(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session, + struct ceph_msg *msg); +extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); +extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, + struct ceph_cap_snap *capsnap); +extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); +extern int ceph_snap_init(void); +extern void ceph_snap_exit(void); + +/* + * a cap_snap is "pending" if it is still awaiting an in-progress + * sync write (that may/may not still update size, mtime, etc.). + */ +static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) +{ + return !list_empty(&ci->i_cap_snaps) && + list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, + ci_item)->writing; +} + +/* inode.c */ +extern const struct inode_operations ceph_file_iops; + +extern struct inode *ceph_alloc_inode(struct super_block *sb); +extern void ceph_destroy_inode(struct inode *inode); +extern int ceph_drop_inode(struct inode *inode); + +extern struct inode *ceph_get_inode(struct super_block *sb, + struct ceph_vino vino); +extern struct inode *ceph_get_snapdir(struct inode *parent); +extern int ceph_fill_file_size(struct inode *inode, int issued, + u32 truncate_seq, u64 truncate_size, u64 size); +extern void ceph_fill_file_time(struct inode *inode, int issued, + u64 time_warp_seq, struct timespec *ctime, + struct timespec *mtime, struct timespec *atime); +extern int ceph_fill_trace(struct super_block *sb, + struct ceph_mds_request *req, + struct ceph_mds_session *session); +extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, + struct ceph_mds_session *session); + +extern int ceph_inode_holds_cap(struct inode *inode, int mask); + +extern int ceph_inode_set_size(struct inode *inode, loff_t size); +extern void __ceph_do_pending_vmtruncate(struct inode *inode); +extern void ceph_queue_vmtruncate(struct inode *inode); + +extern void ceph_queue_invalidate(struct inode *inode); +extern void ceph_queue_writeback(struct inode *inode); + +extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page, + int mask, bool force); +static inline int ceph_do_getattr(struct inode *inode, int mask, bool force) +{ + return __ceph_do_getattr(inode, NULL, mask, force); +} +extern int ceph_permission(struct inode *inode, int mask); +extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); +extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat); + +/* xattr.c */ +extern int ceph_setxattr(struct dentry *, const char *, const void *, + size_t, int); +int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int); +ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t); +int __ceph_removexattr(struct dentry *, const char *); +extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); +extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); +extern int ceph_removexattr(struct dentry *, const char *); +extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); +extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); +extern void __init ceph_xattr_init(void); +extern void ceph_xattr_exit(void); +extern const struct xattr_handler *ceph_xattr_handlers[]; + +/* acl.c */ +struct ceph_acls_info { + void *default_acl; + void *acl; + struct ceph_pagelist *pagelist; +}; + +#ifdef CONFIG_CEPH_FS_POSIX_ACL + +struct posix_acl *ceph_get_acl(struct inode *, int); +int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type); +int ceph_pre_init_acls(struct inode *dir, umode_t *mode, + struct ceph_acls_info *info); +void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info); +void ceph_release_acls_info(struct ceph_acls_info *info); + +static inline void ceph_forget_all_cached_acls(struct inode *inode) +{ + forget_all_cached_acls(inode); +} + +#else + +#define ceph_get_acl NULL +#define ceph_set_acl NULL + +static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode, + struct ceph_acls_info *info) +{ + return 0; +} +static inline void ceph_init_inode_acls(struct inode *inode, + struct ceph_acls_info *info) +{ +} +static inline void ceph_release_acls_info(struct ceph_acls_info *info) +{ +} +static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) +{ + return 0; +} + +static inline void ceph_forget_all_cached_acls(struct inode *inode) +{ +} + +#endif + +/* caps.c */ +extern const char *ceph_cap_string(int c); +extern void ceph_handle_caps(struct ceph_mds_session *session, + struct ceph_msg *msg); +extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, + struct ceph_cap_reservation *ctx); +extern void ceph_add_cap(struct inode *inode, + struct ceph_mds_session *session, u64 cap_id, + int fmode, unsigned issued, unsigned wanted, + unsigned cap, unsigned seq, u64 realmino, int flags, + struct ceph_cap **new_cap); +extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); +extern void ceph_put_cap(struct ceph_mds_client *mdsc, + struct ceph_cap *cap); +extern int ceph_is_any_caps(struct inode *inode); + +extern void __queue_cap_release(struct ceph_mds_session *session, u64 ino, + u64 cap_id, u32 migrate_seq, u32 issue_seq); +extern void ceph_queue_caps_release(struct inode *inode); +extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); +extern int ceph_fsync(struct file *file, loff_t start, loff_t end, + int datasync); +extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session); +extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, + int mds); +extern int ceph_get_cap_mds(struct inode *inode); +extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); +extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); +extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, + struct ceph_snap_context *snapc); +extern void __ceph_flush_snaps(struct ceph_inode_info *ci, + struct ceph_mds_session **psession, + int again); +extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, + struct ceph_mds_session *session); +extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); +extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); + +extern int ceph_encode_inode_release(void **p, struct inode *inode, + int mds, int drop, int unless, int force); +extern int ceph_encode_dentry_release(void **p, struct dentry *dn, + int mds, int drop, int unless); + +extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, + loff_t endoff, int *got, struct page **pinned_page); + +/* for counting open files by mode */ +static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) +{ + ci->i_nr_by_mode[mode]++; +} +extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); + +/* addr.c */ +extern const struct address_space_operations ceph_aops; +extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); + +/* file.c */ +extern const struct file_operations ceph_file_fops; + +extern int ceph_open(struct inode *inode, struct file *file); +extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, + struct file *file, unsigned flags, umode_t mode, + int *opened); +extern int ceph_release(struct inode *inode, struct file *filp); +extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, + char *data, size_t len); +int ceph_uninline_data(struct file *filp, struct page *locked_page); +/* dir.c */ +extern const struct file_operations ceph_dir_fops; +extern const struct file_operations ceph_snapdir_fops; +extern const struct inode_operations ceph_dir_iops; +extern const struct inode_operations ceph_snapdir_iops; +extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, + ceph_snapdir_dentry_ops; + +extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); +extern int ceph_handle_snapdir(struct ceph_mds_request *req, + struct dentry *dentry, int err); +extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, + struct dentry *dentry, int err); + +extern void ceph_dentry_lru_add(struct dentry *dn); +extern void ceph_dentry_lru_touch(struct dentry *dn); +extern void ceph_dentry_lru_del(struct dentry *dn); +extern void ceph_invalidate_dentry_lease(struct dentry *dentry); +extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); +extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry); + +/* + * our d_ops vary depending on whether the inode is live, + * snapshotted (read-only), or a virtual ".snap" directory. + */ +int ceph_init_dentry(struct dentry *dentry); + + +/* ioctl.c */ +extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); + +/* export.c */ +extern const struct export_operations ceph_export_ops; + +/* locks.c */ +extern __init void ceph_flock_init(void); +extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); +extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); +extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); +extern int ceph_encode_locks_to_buffer(struct inode *inode, + struct ceph_filelock *flocks, + int num_fcntl_locks, + int num_flock_locks); +extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, + struct ceph_pagelist *pagelist, + int num_fcntl_locks, int num_flock_locks); +extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); + +/* debugfs.c */ +extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); +extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); + +#endif /* _FS_CEPH_SUPER_H */ diff --git a/kernel/fs/ceph/xattr.c b/kernel/fs/ceph/xattr.c new file mode 100644 index 000000000..cd7ffad40 --- /dev/null +++ b/kernel/fs/ceph/xattr.c @@ -0,0 +1,1117 @@ +#include +#include + +#include "super.h" +#include "mds_client.h" + +#include + +#include +#include +#include + +#define XATTR_CEPH_PREFIX "ceph." +#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1) + +static int __remove_xattr(struct ceph_inode_info *ci, + struct ceph_inode_xattr *xattr); + +/* + * List of handlers for synthetic system.* attributes. Other + * attributes are handled directly. + */ +const struct xattr_handler *ceph_xattr_handlers[] = { +#ifdef CONFIG_CEPH_FS_POSIX_ACL + &posix_acl_access_xattr_handler, + &posix_acl_default_xattr_handler, +#endif + NULL, +}; + +static bool ceph_is_valid_xattr(const char *name) +{ + return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) || + !strncmp(name, XATTR_SECURITY_PREFIX, + XATTR_SECURITY_PREFIX_LEN) || + !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) || + !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) || + !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); +} + +/* + * These define virtual xattrs exposing the recursive directory + * statistics and layout metadata. + */ +struct ceph_vxattr { + char *name; + size_t name_size; /* strlen(name) + 1 (for '\0') */ + size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val, + size_t size); + bool readonly, hidden; + bool (*exists_cb)(struct ceph_inode_info *ci); +}; + +/* layouts */ + +static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci) +{ + size_t s; + char *p = (char *)&ci->i_layout; + + for (s = 0; s < sizeof(ci->i_layout); s++, p++) + if (*p) + return true; + return false; +} + +static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val, + size_t size) +{ + int ret; + struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb); + struct ceph_osd_client *osdc = &fsc->client->osdc; + s64 pool = ceph_file_layout_pg_pool(ci->i_layout); + const char *pool_name; + char buf[128]; + + dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode); + down_read(&osdc->map_sem); + pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); + if (pool_name) { + size_t len = strlen(pool_name); + ret = snprintf(buf, sizeof(buf), + "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=", + (unsigned long long)ceph_file_layout_su(ci->i_layout), + (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout), + (unsigned long long)ceph_file_layout_object_size(ci->i_layout)); + if (!size) { + ret += len; + } else if (ret + len > size) { + ret = -ERANGE; + } else { + memcpy(val, buf, ret); + memcpy(val + ret, pool_name, len); + ret += len; + } + } else { + ret = snprintf(buf, sizeof(buf), + "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld", + (unsigned long long)ceph_file_layout_su(ci->i_layout), + (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout), + (unsigned long long)ceph_file_layout_object_size(ci->i_layout), + (unsigned long long)pool); + if (size) { + if (ret <= size) + memcpy(val, buf, ret); + else + ret = -ERANGE; + } + } + up_read(&osdc->map_sem); + return ret; +} + +static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci, + char *val, size_t size) +{ + return snprintf(val, size, "%lld", + (unsigned long long)ceph_file_layout_su(ci->i_layout)); +} + +static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci, + char *val, size_t size) +{ + return snprintf(val, size, "%lld", + (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout)); +} + +static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci, + char *val, size_t size) +{ + return snprintf(val, size, "%lld", + (unsigned long long)ceph_file_layout_object_size(ci->i_layout)); +} + +static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci, + char *val, size_t size) +{ + int ret; + struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb); + struct ceph_osd_client *osdc = &fsc->client->osdc; + s64 pool = ceph_file_layout_pg_pool(ci->i_layout); + const char *pool_name; + + down_read(&osdc->map_sem); + pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); + if (pool_name) + ret = snprintf(val, size, "%s", pool_name); + else + ret = snprintf(val, size, "%lld", (unsigned long long)pool); + up_read(&osdc->map_sem); + return ret; +} + +/* directories */ + +static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs); +} + +static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return snprintf(val, size, "%lld", ci->i_files); +} + +static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return snprintf(val, size, "%lld", ci->i_subdirs); +} + +static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs); +} + +static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return snprintf(val, size, "%lld", ci->i_rfiles); +} + +static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return snprintf(val, size, "%lld", ci->i_rsubdirs); +} + +static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return snprintf(val, size, "%lld", ci->i_rbytes); +} + +static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec, + (long)ci->i_rctime.tv_nsec); +} + + +#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name +#define CEPH_XATTR_NAME2(_type, _name, _name2) \ + XATTR_CEPH_PREFIX #_type "." #_name "." #_name2 + +#define XATTR_NAME_CEPH(_type, _name) \ + { \ + .name = CEPH_XATTR_NAME(_type, _name), \ + .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ + .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ + .readonly = true, \ + .hidden = false, \ + .exists_cb = NULL, \ + } +#define XATTR_LAYOUT_FIELD(_type, _name, _field) \ + { \ + .name = CEPH_XATTR_NAME2(_type, _name, _field), \ + .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \ + .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \ + .readonly = false, \ + .hidden = true, \ + .exists_cb = ceph_vxattrcb_layout_exists, \ + } + +static struct ceph_vxattr ceph_dir_vxattrs[] = { + { + .name = "ceph.dir.layout", + .name_size = sizeof("ceph.dir.layout"), + .getxattr_cb = ceph_vxattrcb_layout, + .readonly = false, + .hidden = true, + .exists_cb = ceph_vxattrcb_layout_exists, + }, + XATTR_LAYOUT_FIELD(dir, layout, stripe_unit), + XATTR_LAYOUT_FIELD(dir, layout, stripe_count), + XATTR_LAYOUT_FIELD(dir, layout, object_size), + XATTR_LAYOUT_FIELD(dir, layout, pool), + XATTR_NAME_CEPH(dir, entries), + XATTR_NAME_CEPH(dir, files), + XATTR_NAME_CEPH(dir, subdirs), + XATTR_NAME_CEPH(dir, rentries), + XATTR_NAME_CEPH(dir, rfiles), + XATTR_NAME_CEPH(dir, rsubdirs), + XATTR_NAME_CEPH(dir, rbytes), + XATTR_NAME_CEPH(dir, rctime), + { .name = NULL, 0 } /* Required table terminator */ +}; +static size_t ceph_dir_vxattrs_name_size; /* total size of all names */ + +/* files */ + +static struct ceph_vxattr ceph_file_vxattrs[] = { + { + .name = "ceph.file.layout", + .name_size = sizeof("ceph.file.layout"), + .getxattr_cb = ceph_vxattrcb_layout, + .readonly = false, + .hidden = true, + .exists_cb = ceph_vxattrcb_layout_exists, + }, + XATTR_LAYOUT_FIELD(file, layout, stripe_unit), + XATTR_LAYOUT_FIELD(file, layout, stripe_count), + XATTR_LAYOUT_FIELD(file, layout, object_size), + XATTR_LAYOUT_FIELD(file, layout, pool), + { .name = NULL, 0 } /* Required table terminator */ +}; +static size_t ceph_file_vxattrs_name_size; /* total size of all names */ + +static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode) +{ + if (S_ISDIR(inode->i_mode)) + return ceph_dir_vxattrs; + else if (S_ISREG(inode->i_mode)) + return ceph_file_vxattrs; + return NULL; +} + +static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs) +{ + if (vxattrs == ceph_dir_vxattrs) + return ceph_dir_vxattrs_name_size; + if (vxattrs == ceph_file_vxattrs) + return ceph_file_vxattrs_name_size; + BUG_ON(vxattrs); + return 0; +} + +/* + * Compute the aggregate size (including terminating '\0') of all + * virtual extended attribute names in the given vxattr table. + */ +static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs) +{ + struct ceph_vxattr *vxattr; + size_t size = 0; + + for (vxattr = vxattrs; vxattr->name; vxattr++) + if (!vxattr->hidden) + size += vxattr->name_size; + + return size; +} + +/* Routines called at initialization and exit time */ + +void __init ceph_xattr_init(void) +{ + ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs); + ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs); +} + +void ceph_xattr_exit(void) +{ + ceph_dir_vxattrs_name_size = 0; + ceph_file_vxattrs_name_size = 0; +} + +static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode, + const char *name) +{ + struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode); + + if (vxattr) { + while (vxattr->name) { + if (!strcmp(vxattr->name, name)) + return vxattr; + vxattr++; + } + } + + return NULL; +} + +static int __set_xattr(struct ceph_inode_info *ci, + const char *name, int name_len, + const char *val, int val_len, + int flags, int update_xattr, + struct ceph_inode_xattr **newxattr) +{ + struct rb_node **p; + struct rb_node *parent = NULL; + struct ceph_inode_xattr *xattr = NULL; + int c; + int new = 0; + + p = &ci->i_xattrs.index.rb_node; + while (*p) { + parent = *p; + xattr = rb_entry(parent, struct ceph_inode_xattr, node); + c = strncmp(name, xattr->name, min(name_len, xattr->name_len)); + if (c < 0) + p = &(*p)->rb_left; + else if (c > 0) + p = &(*p)->rb_right; + else { + if (name_len == xattr->name_len) + break; + else if (name_len < xattr->name_len) + p = &(*p)->rb_left; + else + p = &(*p)->rb_right; + } + xattr = NULL; + } + + if (update_xattr) { + int err = 0; + if (xattr && (flags & XATTR_CREATE)) + err = -EEXIST; + else if (!xattr && (flags & XATTR_REPLACE)) + err = -ENODATA; + if (err) { + kfree(name); + kfree(val); + return err; + } + if (update_xattr < 0) { + if (xattr) + __remove_xattr(ci, xattr); + kfree(name); + return 0; + } + } + + if (!xattr) { + new = 1; + xattr = *newxattr; + xattr->name = name; + xattr->name_len = name_len; + xattr->should_free_name = update_xattr; + + ci->i_xattrs.count++; + dout("__set_xattr count=%d\n", ci->i_xattrs.count); + } else { + kfree(*newxattr); + *newxattr = NULL; + if (xattr->should_free_val) + kfree((void *)xattr->val); + + if (update_xattr) { + kfree((void *)name); + name = xattr->name; + } + ci->i_xattrs.names_size -= xattr->name_len; + ci->i_xattrs.vals_size -= xattr->val_len; + } + ci->i_xattrs.names_size += name_len; + ci->i_xattrs.vals_size += val_len; + if (val) + xattr->val = val; + else + xattr->val = ""; + + xattr->val_len = val_len; + xattr->dirty = update_xattr; + xattr->should_free_val = (val && update_xattr); + + if (new) { + rb_link_node(&xattr->node, parent, p); + rb_insert_color(&xattr->node, &ci->i_xattrs.index); + dout("__set_xattr_val p=%p\n", p); + } + + dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n", + ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val); + + return 0; +} + +static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci, + const char *name) +{ + struct rb_node **p; + struct rb_node *parent = NULL; + struct ceph_inode_xattr *xattr = NULL; + int name_len = strlen(name); + int c; + + p = &ci->i_xattrs.index.rb_node; + while (*p) { + parent = *p; + xattr = rb_entry(parent, struct ceph_inode_xattr, node); + c = strncmp(name, xattr->name, xattr->name_len); + if (c == 0 && name_len > xattr->name_len) + c = 1; + if (c < 0) + p = &(*p)->rb_left; + else if (c > 0) + p = &(*p)->rb_right; + else { + dout("__get_xattr %s: found %.*s\n", name, + xattr->val_len, xattr->val); + return xattr; + } + } + + dout("__get_xattr %s: not found\n", name); + + return NULL; +} + +static void __free_xattr(struct ceph_inode_xattr *xattr) +{ + BUG_ON(!xattr); + + if (xattr->should_free_name) + kfree((void *)xattr->name); + if (xattr->should_free_val) + kfree((void *)xattr->val); + + kfree(xattr); +} + +static int __remove_xattr(struct ceph_inode_info *ci, + struct ceph_inode_xattr *xattr) +{ + if (!xattr) + return -ENODATA; + + rb_erase(&xattr->node, &ci->i_xattrs.index); + + if (xattr->should_free_name) + kfree((void *)xattr->name); + if (xattr->should_free_val) + kfree((void *)xattr->val); + + ci->i_xattrs.names_size -= xattr->name_len; + ci->i_xattrs.vals_size -= xattr->val_len; + ci->i_xattrs.count--; + kfree(xattr); + + return 0; +} + +static int __remove_xattr_by_name(struct ceph_inode_info *ci, + const char *name) +{ + struct rb_node **p; + struct ceph_inode_xattr *xattr; + int err; + + p = &ci->i_xattrs.index.rb_node; + xattr = __get_xattr(ci, name); + err = __remove_xattr(ci, xattr); + return err; +} + +static char *__copy_xattr_names(struct ceph_inode_info *ci, + char *dest) +{ + struct rb_node *p; + struct ceph_inode_xattr *xattr = NULL; + + p = rb_first(&ci->i_xattrs.index); + dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count); + + while (p) { + xattr = rb_entry(p, struct ceph_inode_xattr, node); + memcpy(dest, xattr->name, xattr->name_len); + dest[xattr->name_len] = '\0'; + + dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name, + xattr->name_len, ci->i_xattrs.names_size); + + dest += xattr->name_len + 1; + p = rb_next(p); + } + + return dest; +} + +void __ceph_destroy_xattrs(struct ceph_inode_info *ci) +{ + struct rb_node *p, *tmp; + struct ceph_inode_xattr *xattr = NULL; + + p = rb_first(&ci->i_xattrs.index); + + dout("__ceph_destroy_xattrs p=%p\n", p); + + while (p) { + xattr = rb_entry(p, struct ceph_inode_xattr, node); + tmp = p; + p = rb_next(tmp); + dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p, + xattr->name_len, xattr->name); + rb_erase(tmp, &ci->i_xattrs.index); + + __free_xattr(xattr); + } + + ci->i_xattrs.names_size = 0; + ci->i_xattrs.vals_size = 0; + ci->i_xattrs.index_version = 0; + ci->i_xattrs.count = 0; + ci->i_xattrs.index = RB_ROOT; +} + +static int __build_xattrs(struct inode *inode) + __releases(ci->i_ceph_lock) + __acquires(ci->i_ceph_lock) +{ + u32 namelen; + u32 numattr = 0; + void *p, *end; + u32 len; + const char *name, *val; + struct ceph_inode_info *ci = ceph_inode(inode); + int xattr_version; + struct ceph_inode_xattr **xattrs = NULL; + int err = 0; + int i; + + dout("__build_xattrs() len=%d\n", + ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0); + + if (ci->i_xattrs.index_version >= ci->i_xattrs.version) + return 0; /* already built */ + + __ceph_destroy_xattrs(ci); + +start: + /* updated internal xattr rb tree */ + if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) { + p = ci->i_xattrs.blob->vec.iov_base; + end = p + ci->i_xattrs.blob->vec.iov_len; + ceph_decode_32_safe(&p, end, numattr, bad); + xattr_version = ci->i_xattrs.version; + spin_unlock(&ci->i_ceph_lock); + + xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *), + GFP_NOFS); + err = -ENOMEM; + if (!xattrs) + goto bad_lock; + + for (i = 0; i < numattr; i++) { + xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr), + GFP_NOFS); + if (!xattrs[i]) + goto bad_lock; + } + + spin_lock(&ci->i_ceph_lock); + if (ci->i_xattrs.version != xattr_version) { + /* lost a race, retry */ + for (i = 0; i < numattr; i++) + kfree(xattrs[i]); + kfree(xattrs); + xattrs = NULL; + goto start; + } + err = -EIO; + while (numattr--) { + ceph_decode_32_safe(&p, end, len, bad); + namelen = len; + name = p; + p += len; + ceph_decode_32_safe(&p, end, len, bad); + val = p; + p += len; + + err = __set_xattr(ci, name, namelen, val, len, + 0, 0, &xattrs[numattr]); + + if (err < 0) + goto bad; + } + kfree(xattrs); + } + ci->i_xattrs.index_version = ci->i_xattrs.version; + ci->i_xattrs.dirty = false; + + return err; +bad_lock: + spin_lock(&ci->i_ceph_lock); +bad: + if (xattrs) { + for (i = 0; i < numattr; i++) + kfree(xattrs[i]); + kfree(xattrs); + } + ci->i_xattrs.names_size = 0; + return err; +} + +static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size, + int val_size) +{ + /* + * 4 bytes for the length, and additional 4 bytes per each xattr name, + * 4 bytes per each value + */ + int size = 4 + ci->i_xattrs.count*(4 + 4) + + ci->i_xattrs.names_size + + ci->i_xattrs.vals_size; + dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n", + ci->i_xattrs.count, ci->i_xattrs.names_size, + ci->i_xattrs.vals_size); + + if (name_size) + size += 4 + 4 + name_size + val_size; + + return size; +} + +/* + * If there are dirty xattrs, reencode xattrs into the prealloc_blob + * and swap into place. + */ +void __ceph_build_xattrs_blob(struct ceph_inode_info *ci) +{ + struct rb_node *p; + struct ceph_inode_xattr *xattr = NULL; + void *dest; + + dout("__build_xattrs_blob %p\n", &ci->vfs_inode); + if (ci->i_xattrs.dirty) { + int need = __get_required_blob_size(ci, 0, 0); + + BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len); + + p = rb_first(&ci->i_xattrs.index); + dest = ci->i_xattrs.prealloc_blob->vec.iov_base; + + ceph_encode_32(&dest, ci->i_xattrs.count); + while (p) { + xattr = rb_entry(p, struct ceph_inode_xattr, node); + + ceph_encode_32(&dest, xattr->name_len); + memcpy(dest, xattr->name, xattr->name_len); + dest += xattr->name_len; + ceph_encode_32(&dest, xattr->val_len); + memcpy(dest, xattr->val, xattr->val_len); + dest += xattr->val_len; + + p = rb_next(p); + } + + /* adjust buffer len; it may be larger than we need */ + ci->i_xattrs.prealloc_blob->vec.iov_len = + dest - ci->i_xattrs.prealloc_blob->vec.iov_base; + + if (ci->i_xattrs.blob) + ceph_buffer_put(ci->i_xattrs.blob); + ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob; + ci->i_xattrs.prealloc_blob = NULL; + ci->i_xattrs.dirty = false; + ci->i_xattrs.version++; + } +} + +ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, + size_t size) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int err; + struct ceph_inode_xattr *xattr; + struct ceph_vxattr *vxattr = NULL; + + if (!ceph_is_valid_xattr(name)) + return -ENODATA; + + /* let's see if a virtual xattr was requested */ + vxattr = ceph_match_vxattr(inode, name); + if (vxattr && !(vxattr->exists_cb && !vxattr->exists_cb(ci))) { + err = vxattr->getxattr_cb(ci, value, size); + return err; + } + + spin_lock(&ci->i_ceph_lock); + dout("getxattr %p ver=%lld index_ver=%lld\n", inode, + ci->i_xattrs.version, ci->i_xattrs.index_version); + + if (ci->i_xattrs.version == 0 || + !__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) { + spin_unlock(&ci->i_ceph_lock); + /* get xattrs from mds (if we don't already have them) */ + err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true); + if (err) + return err; + spin_lock(&ci->i_ceph_lock); + } + + err = __build_xattrs(inode); + if (err < 0) + goto out; + + err = -ENODATA; /* == ENOATTR */ + xattr = __get_xattr(ci, name); + if (!xattr) + goto out; + + err = -ERANGE; + if (size && size < xattr->val_len) + goto out; + + err = xattr->val_len; + if (size == 0) + goto out; + + memcpy(value, xattr->val, xattr->val_len); + +out: + spin_unlock(&ci->i_ceph_lock); + return err; +} + +ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value, + size_t size) +{ + if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) + return generic_getxattr(dentry, name, value, size); + + return __ceph_getxattr(d_inode(dentry), name, value, size); +} + +ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size) +{ + struct inode *inode = d_inode(dentry); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode); + u32 vir_namelen = 0; + u32 namelen; + int err; + u32 len; + int i; + + spin_lock(&ci->i_ceph_lock); + dout("listxattr %p ver=%lld index_ver=%lld\n", inode, + ci->i_xattrs.version, ci->i_xattrs.index_version); + + if (ci->i_xattrs.version == 0 || + !__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) { + spin_unlock(&ci->i_ceph_lock); + err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true); + if (err) + return err; + spin_lock(&ci->i_ceph_lock); + } + + err = __build_xattrs(inode); + if (err < 0) + goto out; + /* + * Start with virtual dir xattr names (if any) (including + * terminating '\0' characters for each). + */ + vir_namelen = ceph_vxattrs_name_size(vxattrs); + + /* adding 1 byte per each variable due to the null termination */ + namelen = ci->i_xattrs.names_size + ci->i_xattrs.count; + err = -ERANGE; + if (size && vir_namelen + namelen > size) + goto out; + + err = namelen + vir_namelen; + if (size == 0) + goto out; + + names = __copy_xattr_names(ci, names); + + /* virtual xattr names, too */ + err = namelen; + if (vxattrs) { + for (i = 0; vxattrs[i].name; i++) { + if (!vxattrs[i].hidden && + !(vxattrs[i].exists_cb && + !vxattrs[i].exists_cb(ci))) { + len = sprintf(names, "%s", vxattrs[i].name); + names += len + 1; + err += len + 1; + } + } + } + +out: + spin_unlock(&ci->i_ceph_lock); + return err; +} + +static int ceph_sync_setxattr(struct dentry *dentry, const char *name, + const char *value, size_t size, int flags) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); + struct inode *inode = d_inode(dentry); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_mds_request *req; + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_pagelist *pagelist = NULL; + int err; + + if (size > 0) { + /* copy value into pagelist */ + pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); + if (!pagelist) + return -ENOMEM; + + ceph_pagelist_init(pagelist); + err = ceph_pagelist_append(pagelist, value, size); + if (err) + goto out; + } else if (!value) { + flags |= CEPH_XATTR_REMOVE; + } + + dout("setxattr value=%.*s\n", (int)size, value); + + /* do request */ + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR, + USE_AUTH_MDS); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + + req->r_args.setxattr.flags = cpu_to_le32(flags); + req->r_path2 = kstrdup(name, GFP_NOFS); + if (!req->r_path2) { + ceph_mdsc_put_request(req); + err = -ENOMEM; + goto out; + } + + req->r_pagelist = pagelist; + pagelist = NULL; + + req->r_inode = inode; + ihold(inode); + req->r_num_caps = 1; + req->r_inode_drop = CEPH_CAP_XATTR_SHARED; + + dout("xattr.ver (before): %lld\n", ci->i_xattrs.version); + err = ceph_mdsc_do_request(mdsc, NULL, req); + ceph_mdsc_put_request(req); + dout("xattr.ver (after): %lld\n", ci->i_xattrs.version); + +out: + if (pagelist) + ceph_pagelist_release(pagelist); + return err; +} + +int __ceph_setxattr(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags) +{ + struct inode *inode = d_inode(dentry); + struct ceph_vxattr *vxattr; + struct ceph_inode_info *ci = ceph_inode(inode); + int issued; + int err; + int dirty = 0; + int name_len = strlen(name); + int val_len = size; + char *newname = NULL; + char *newval = NULL; + struct ceph_inode_xattr *xattr = NULL; + int required_blob_size; + + if (!ceph_is_valid_xattr(name)) + return -EOPNOTSUPP; + + vxattr = ceph_match_vxattr(inode, name); + if (vxattr && vxattr->readonly) + return -EOPNOTSUPP; + + /* pass any unhandled ceph.* xattrs through to the MDS */ + if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) + goto do_sync_unlocked; + + /* preallocate memory for xattr name, value, index node */ + err = -ENOMEM; + newname = kmemdup(name, name_len + 1, GFP_NOFS); + if (!newname) + goto out; + + if (val_len) { + newval = kmemdup(value, val_len, GFP_NOFS); + if (!newval) + goto out; + } + + xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS); + if (!xattr) + goto out; + + spin_lock(&ci->i_ceph_lock); +retry: + issued = __ceph_caps_issued(ci, NULL); + dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued)); + if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) + goto do_sync; + __build_xattrs(inode); + + required_blob_size = __get_required_blob_size(ci, name_len, val_len); + + if (!ci->i_xattrs.prealloc_blob || + required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { + struct ceph_buffer *blob; + + spin_unlock(&ci->i_ceph_lock); + dout(" preaallocating new blob size=%d\n", required_blob_size); + blob = ceph_buffer_new(required_blob_size, GFP_NOFS); + if (!blob) + goto out; + spin_lock(&ci->i_ceph_lock); + if (ci->i_xattrs.prealloc_blob) + ceph_buffer_put(ci->i_xattrs.prealloc_blob); + ci->i_xattrs.prealloc_blob = blob; + goto retry; + } + + err = __set_xattr(ci, newname, name_len, newval, val_len, + flags, value ? 1 : -1, &xattr); + + if (!err) { + dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL); + ci->i_xattrs.dirty = true; + inode->i_ctime = CURRENT_TIME; + } + + spin_unlock(&ci->i_ceph_lock); + if (dirty) + __mark_inode_dirty(inode, dirty); + return err; + +do_sync: + spin_unlock(&ci->i_ceph_lock); +do_sync_unlocked: + err = ceph_sync_setxattr(dentry, name, value, size, flags); +out: + kfree(newname); + kfree(newval); + kfree(xattr); + return err; +} + +int ceph_setxattr(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags) +{ + if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) + return -EROFS; + + if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) + return generic_setxattr(dentry, name, value, size, flags); + + if (size == 0) + value = ""; /* empty EA, do not remove */ + + return __ceph_setxattr(dentry, name, value, size, flags); +} + +static int ceph_send_removexattr(struct dentry *dentry, const char *name) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct inode *inode = d_inode(dentry); + struct ceph_mds_request *req; + int err; + + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR, + USE_AUTH_MDS); + if (IS_ERR(req)) + return PTR_ERR(req); + req->r_path2 = kstrdup(name, GFP_NOFS); + if (!req->r_path2) + return -ENOMEM; + + req->r_inode = inode; + ihold(inode); + req->r_num_caps = 1; + req->r_inode_drop = CEPH_CAP_XATTR_SHARED; + err = ceph_mdsc_do_request(mdsc, NULL, req); + ceph_mdsc_put_request(req); + return err; +} + +int __ceph_removexattr(struct dentry *dentry, const char *name) +{ + struct inode *inode = d_inode(dentry); + struct ceph_vxattr *vxattr; + struct ceph_inode_info *ci = ceph_inode(inode); + int issued; + int err; + int required_blob_size; + int dirty; + + if (!ceph_is_valid_xattr(name)) + return -EOPNOTSUPP; + + vxattr = ceph_match_vxattr(inode, name); + if (vxattr && vxattr->readonly) + return -EOPNOTSUPP; + + /* pass any unhandled ceph.* xattrs through to the MDS */ + if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) + goto do_sync_unlocked; + + err = -ENOMEM; + spin_lock(&ci->i_ceph_lock); +retry: + issued = __ceph_caps_issued(ci, NULL); + dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued)); + + if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) + goto do_sync; + __build_xattrs(inode); + + required_blob_size = __get_required_blob_size(ci, 0, 0); + + if (!ci->i_xattrs.prealloc_blob || + required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { + struct ceph_buffer *blob; + + spin_unlock(&ci->i_ceph_lock); + dout(" preaallocating new blob size=%d\n", required_blob_size); + blob = ceph_buffer_new(required_blob_size, GFP_NOFS); + if (!blob) + goto out; + spin_lock(&ci->i_ceph_lock); + if (ci->i_xattrs.prealloc_blob) + ceph_buffer_put(ci->i_xattrs.prealloc_blob); + ci->i_xattrs.prealloc_blob = blob; + goto retry; + } + + err = __remove_xattr_by_name(ceph_inode(inode), name); + + dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL); + ci->i_xattrs.dirty = true; + inode->i_ctime = CURRENT_TIME; + spin_unlock(&ci->i_ceph_lock); + if (dirty) + __mark_inode_dirty(inode, dirty); + return err; +do_sync: + spin_unlock(&ci->i_ceph_lock); +do_sync_unlocked: + err = ceph_send_removexattr(dentry, name); +out: + return err; +} + +int ceph_removexattr(struct dentry *dentry, const char *name) +{ + if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) + return -EROFS; + + if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) + return generic_removexattr(dentry, name); + + return __ceph_removexattr(dentry, name); +} -- cgit 1.2.3-korg