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/ext3/Kconfig | 89 + kernel/fs/ext3/Makefile | 12 + kernel/fs/ext3/acl.c | 281 +++ kernel/fs/ext3/acl.h | 72 + kernel/fs/ext3/balloc.c | 2158 +++++++++++++++++++++++ kernel/fs/ext3/bitmap.c | 20 + kernel/fs/ext3/dir.c | 537 ++++++ kernel/fs/ext3/ext3.h | 1332 +++++++++++++++ kernel/fs/ext3/ext3_jbd.c | 59 + kernel/fs/ext3/file.c | 79 + kernel/fs/ext3/fsync.c | 109 ++ kernel/fs/ext3/hash.c | 206 +++ kernel/fs/ext3/ialloc.c | 706 ++++++++ kernel/fs/ext3/inode.c | 3573 +++++++++++++++++++++++++++++++++++++++ kernel/fs/ext3/ioctl.c | 327 ++++ kernel/fs/ext3/namei.c | 2585 ++++++++++++++++++++++++++++ kernel/fs/ext3/namei.h | 27 + kernel/fs/ext3/resize.c | 1117 ++++++++++++ kernel/fs/ext3/super.c | 3165 ++++++++++++++++++++++++++++++++++ kernel/fs/ext3/symlink.c | 54 + kernel/fs/ext3/xattr.c | 1330 +++++++++++++++ kernel/fs/ext3/xattr.h | 136 ++ kernel/fs/ext3/xattr_security.c | 78 + kernel/fs/ext3/xattr_trusted.c | 54 + kernel/fs/ext3/xattr_user.c | 58 + 25 files changed, 18164 insertions(+) create mode 100644 kernel/fs/ext3/Kconfig create mode 100644 kernel/fs/ext3/Makefile create mode 100644 kernel/fs/ext3/acl.c create mode 100644 kernel/fs/ext3/acl.h create mode 100644 kernel/fs/ext3/balloc.c create mode 100644 kernel/fs/ext3/bitmap.c create mode 100644 kernel/fs/ext3/dir.c create mode 100644 kernel/fs/ext3/ext3.h create mode 100644 kernel/fs/ext3/ext3_jbd.c create mode 100644 kernel/fs/ext3/file.c create mode 100644 kernel/fs/ext3/fsync.c create mode 100644 kernel/fs/ext3/hash.c create mode 100644 kernel/fs/ext3/ialloc.c create mode 100644 kernel/fs/ext3/inode.c create mode 100644 kernel/fs/ext3/ioctl.c create mode 100644 kernel/fs/ext3/namei.c create mode 100644 kernel/fs/ext3/namei.h create mode 100644 kernel/fs/ext3/resize.c create mode 100644 kernel/fs/ext3/super.c create mode 100644 kernel/fs/ext3/symlink.c create mode 100644 kernel/fs/ext3/xattr.c create mode 100644 kernel/fs/ext3/xattr.h create mode 100644 kernel/fs/ext3/xattr_security.c create mode 100644 kernel/fs/ext3/xattr_trusted.c create mode 100644 kernel/fs/ext3/xattr_user.c (limited to 'kernel/fs/ext3') diff --git a/kernel/fs/ext3/Kconfig b/kernel/fs/ext3/Kconfig new file mode 100644 index 000000000..e8c6ba0e4 --- /dev/null +++ b/kernel/fs/ext3/Kconfig @@ -0,0 +1,89 @@ +config EXT3_FS + tristate "Ext3 journalling file system support" + select JBD + help + This is the journalling version of the Second extended file system + (often called ext3), the de facto standard Linux file system + (method to organize files on a storage device) for hard disks. + + The journalling code included in this driver means you do not have + to run e2fsck (file system checker) on your file systems after a + crash. The journal keeps track of any changes that were being made + at the time the system crashed, and can ensure that your file system + is consistent without the need for a lengthy check. + + Other than adding the journal to the file system, the on-disk format + of ext3 is identical to ext2. It is possible to freely switch + between using the ext3 driver and the ext2 driver, as long as the + file system has been cleanly unmounted, or e2fsck is run on the file + system. + + To add a journal on an existing ext2 file system or change the + behavior of ext3 file systems, you can use the tune2fs utility ("man + tune2fs"). To modify attributes of files and directories on ext3 + file systems, use chattr ("man chattr"). You need to be using + e2fsprogs version 1.20 or later in order to create ext3 journals + (available at ). + + To compile this file system support as a module, choose M here: the + module will be called ext3. + +config EXT3_DEFAULTS_TO_ORDERED + bool "Default to 'data=ordered' in ext3" + depends on EXT3_FS + default y + help + The journal mode options for ext3 have different tradeoffs + between when data is guaranteed to be on disk and + performance. The use of "data=writeback" can cause + unwritten data to appear in files after an system crash or + power failure, which can be a security issue. However, + "data=ordered" mode can also result in major performance + problems, including seconds-long delays before an fsync() + call returns. For details, see: + + http://ext4.wiki.kernel.org/index.php/Ext3_data_mode_tradeoffs + + If you have been historically happy with ext3's performance, + data=ordered mode will be a safe choice and you should + answer 'y' here. If you understand the reliability and data + privacy issues of data=writeback and are willing to make + that trade off, answer 'n'. + +config EXT3_FS_XATTR + bool "Ext3 extended attributes" + depends on EXT3_FS + default y + help + Extended attributes are name:value pairs associated with inodes by + the kernel or by users (see the attr(5) manual page, or visit + for details). + + If unsure, say N. + + You need this for POSIX ACL support on ext3. + +config EXT3_FS_POSIX_ACL + bool "Ext3 POSIX Access Control Lists" + depends on EXT3_FS_XATTR + 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 + +config EXT3_FS_SECURITY + bool "Ext3 Security Labels" + depends on EXT3_FS_XATTR + help + Security labels support alternative access control models + implemented by security modules like SELinux. This option + enables an extended attribute handler for file security + labels in the ext3 filesystem. + + If you are not using a security module that requires using + extended attributes for file security labels, say N. diff --git a/kernel/fs/ext3/Makefile b/kernel/fs/ext3/Makefile new file mode 100644 index 000000000..e77766a8b --- /dev/null +++ b/kernel/fs/ext3/Makefile @@ -0,0 +1,12 @@ +# +# Makefile for the linux ext3-filesystem routines. +# + +obj-$(CONFIG_EXT3_FS) += ext3.o + +ext3-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \ + ioctl.o namei.o super.o symlink.o hash.o resize.o ext3_jbd.o + +ext3-$(CONFIG_EXT3_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o +ext3-$(CONFIG_EXT3_FS_POSIX_ACL) += acl.o +ext3-$(CONFIG_EXT3_FS_SECURITY) += xattr_security.o diff --git a/kernel/fs/ext3/acl.c b/kernel/fs/ext3/acl.c new file mode 100644 index 000000000..8bbaf5bcf --- /dev/null +++ b/kernel/fs/ext3/acl.c @@ -0,0 +1,281 @@ +/* + * linux/fs/ext3/acl.c + * + * Copyright (C) 2001-2003 Andreas Gruenbacher, + */ + +#include "ext3.h" +#include "xattr.h" +#include "acl.h" + +/* + * Convert from filesystem to in-memory representation. + */ +static struct posix_acl * +ext3_acl_from_disk(const void *value, size_t size) +{ + const char *end = (char *)value + size; + int n, count; + struct posix_acl *acl; + + if (!value) + return NULL; + if (size < sizeof(ext3_acl_header)) + return ERR_PTR(-EINVAL); + if (((ext3_acl_header *)value)->a_version != + cpu_to_le32(EXT3_ACL_VERSION)) + return ERR_PTR(-EINVAL); + value = (char *)value + sizeof(ext3_acl_header); + count = ext3_acl_count(size); + if (count < 0) + return ERR_PTR(-EINVAL); + if (count == 0) + return NULL; + acl = posix_acl_alloc(count, GFP_NOFS); + if (!acl) + return ERR_PTR(-ENOMEM); + for (n=0; n < count; n++) { + ext3_acl_entry *entry = + (ext3_acl_entry *)value; + if ((char *)value + sizeof(ext3_acl_entry_short) > end) + goto fail; + acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); + acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); + switch(acl->a_entries[n].e_tag) { + case ACL_USER_OBJ: + case ACL_GROUP_OBJ: + case ACL_MASK: + case ACL_OTHER: + value = (char *)value + + sizeof(ext3_acl_entry_short); + break; + + case ACL_USER: + value = (char *)value + sizeof(ext3_acl_entry); + if ((char *)value > end) + goto fail; + acl->a_entries[n].e_uid = + make_kuid(&init_user_ns, + le32_to_cpu(entry->e_id)); + break; + case ACL_GROUP: + value = (char *)value + sizeof(ext3_acl_entry); + if ((char *)value > end) + goto fail; + acl->a_entries[n].e_gid = + make_kgid(&init_user_ns, + le32_to_cpu(entry->e_id)); + break; + + default: + goto fail; + } + } + if (value != end) + goto fail; + return acl; + +fail: + posix_acl_release(acl); + return ERR_PTR(-EINVAL); +} + +/* + * Convert from in-memory to filesystem representation. + */ +static void * +ext3_acl_to_disk(const struct posix_acl *acl, size_t *size) +{ + ext3_acl_header *ext_acl; + char *e; + size_t n; + + *size = ext3_acl_size(acl->a_count); + ext_acl = kmalloc(sizeof(ext3_acl_header) + acl->a_count * + sizeof(ext3_acl_entry), GFP_NOFS); + if (!ext_acl) + return ERR_PTR(-ENOMEM); + ext_acl->a_version = cpu_to_le32(EXT3_ACL_VERSION); + e = (char *)ext_acl + sizeof(ext3_acl_header); + for (n=0; n < acl->a_count; n++) { + const struct posix_acl_entry *acl_e = &acl->a_entries[n]; + ext3_acl_entry *entry = (ext3_acl_entry *)e; + entry->e_tag = cpu_to_le16(acl_e->e_tag); + entry->e_perm = cpu_to_le16(acl_e->e_perm); + switch(acl_e->e_tag) { + case ACL_USER: + entry->e_id = cpu_to_le32( + from_kuid(&init_user_ns, acl_e->e_uid)); + e += sizeof(ext3_acl_entry); + break; + case ACL_GROUP: + entry->e_id = cpu_to_le32( + from_kgid(&init_user_ns, acl_e->e_gid)); + e += sizeof(ext3_acl_entry); + break; + + case ACL_USER_OBJ: + case ACL_GROUP_OBJ: + case ACL_MASK: + case ACL_OTHER: + e += sizeof(ext3_acl_entry_short); + break; + + default: + goto fail; + } + } + return (char *)ext_acl; + +fail: + kfree(ext_acl); + return ERR_PTR(-EINVAL); +} + +/* + * Inode operation get_posix_acl(). + * + * inode->i_mutex: don't care + */ +struct posix_acl * +ext3_get_acl(struct inode *inode, int type) +{ + int name_index; + char *value = NULL; + struct posix_acl *acl; + int retval; + + switch (type) { + case ACL_TYPE_ACCESS: + name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS; + break; + case ACL_TYPE_DEFAULT: + name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT; + break; + default: + BUG(); + } + + retval = ext3_xattr_get(inode, name_index, "", NULL, 0); + if (retval > 0) { + value = kmalloc(retval, GFP_NOFS); + if (!value) + return ERR_PTR(-ENOMEM); + retval = ext3_xattr_get(inode, name_index, "", value, retval); + } + if (retval > 0) + acl = ext3_acl_from_disk(value, retval); + else if (retval == -ENODATA || retval == -ENOSYS) + acl = NULL; + else + acl = ERR_PTR(retval); + kfree(value); + + if (!IS_ERR(acl)) + set_cached_acl(inode, type, acl); + + return acl; +} + +/* + * Set the access or default ACL of an inode. + * + * inode->i_mutex: down unless called from ext3_new_inode + */ +static int +__ext3_set_acl(handle_t *handle, struct inode *inode, int type, + struct posix_acl *acl) +{ + int name_index; + void *value = NULL; + size_t size = 0; + int error; + + switch(type) { + case ACL_TYPE_ACCESS: + name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS; + if (acl) { + error = posix_acl_equiv_mode(acl, &inode->i_mode); + if (error < 0) + return error; + else { + inode->i_ctime = CURRENT_TIME_SEC; + ext3_mark_inode_dirty(handle, inode); + if (error == 0) + acl = NULL; + } + } + break; + + case ACL_TYPE_DEFAULT: + name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT; + if (!S_ISDIR(inode->i_mode)) + return acl ? -EACCES : 0; + break; + + default: + return -EINVAL; + } + if (acl) { + value = ext3_acl_to_disk(acl, &size); + if (IS_ERR(value)) + return (int)PTR_ERR(value); + } + + error = ext3_xattr_set_handle(handle, inode, name_index, "", + value, size, 0); + + kfree(value); + + if (!error) + set_cached_acl(inode, type, acl); + + return error; +} + +int +ext3_set_acl(struct inode *inode, struct posix_acl *acl, int type) +{ + handle_t *handle; + int error, retries = 0; + +retry: + handle = ext3_journal_start(inode, EXT3_DATA_TRANS_BLOCKS(inode->i_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + error = __ext3_set_acl(handle, inode, type, acl); + ext3_journal_stop(handle); + if (error == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries)) + goto retry; + return error; +} + +/* + * Initialize the ACLs of a new inode. Called from ext3_new_inode. + * + * dir->i_mutex: down + * inode->i_mutex: up (access to inode is still exclusive) + */ +int +ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) +{ + struct posix_acl *default_acl, *acl; + int error; + + error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); + if (error) + return error; + + if (default_acl) { + error = __ext3_set_acl(handle, inode, ACL_TYPE_DEFAULT, + default_acl); + posix_acl_release(default_acl); + } + if (acl) { + if (!error) + error = __ext3_set_acl(handle, inode, ACL_TYPE_ACCESS, + acl); + posix_acl_release(acl); + } + return error; +} diff --git a/kernel/fs/ext3/acl.h b/kernel/fs/ext3/acl.h new file mode 100644 index 000000000..ea1c69eda --- /dev/null +++ b/kernel/fs/ext3/acl.h @@ -0,0 +1,72 @@ +/* + File: fs/ext3/acl.h + + (C) 2001 Andreas Gruenbacher, +*/ + +#include + +#define EXT3_ACL_VERSION 0x0001 + +typedef struct { + __le16 e_tag; + __le16 e_perm; + __le32 e_id; +} ext3_acl_entry; + +typedef struct { + __le16 e_tag; + __le16 e_perm; +} ext3_acl_entry_short; + +typedef struct { + __le32 a_version; +} ext3_acl_header; + +static inline size_t ext3_acl_size(int count) +{ + if (count <= 4) { + return sizeof(ext3_acl_header) + + count * sizeof(ext3_acl_entry_short); + } else { + return sizeof(ext3_acl_header) + + 4 * sizeof(ext3_acl_entry_short) + + (count - 4) * sizeof(ext3_acl_entry); + } +} + +static inline int ext3_acl_count(size_t size) +{ + ssize_t s; + size -= sizeof(ext3_acl_header); + s = size - 4 * sizeof(ext3_acl_entry_short); + if (s < 0) { + if (size % sizeof(ext3_acl_entry_short)) + return -1; + return size / sizeof(ext3_acl_entry_short); + } else { + if (s % sizeof(ext3_acl_entry)) + return -1; + return s / sizeof(ext3_acl_entry) + 4; + } +} + +#ifdef CONFIG_EXT3_FS_POSIX_ACL + +/* acl.c */ +extern struct posix_acl *ext3_get_acl(struct inode *inode, int type); +extern int ext3_set_acl(struct inode *inode, struct posix_acl *acl, int type); +extern int ext3_init_acl (handle_t *, struct inode *, struct inode *); + +#else /* CONFIG_EXT3_FS_POSIX_ACL */ +#include +#define ext3_get_acl NULL +#define ext3_set_acl NULL + +static inline int +ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) +{ + return 0; +} +#endif /* CONFIG_EXT3_FS_POSIX_ACL */ + diff --git a/kernel/fs/ext3/balloc.c b/kernel/fs/ext3/balloc.c new file mode 100644 index 000000000..158b5d4ce --- /dev/null +++ b/kernel/fs/ext3/balloc.c @@ -0,0 +1,2158 @@ +/* + * linux/fs/ext3/balloc.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * Enhanced block allocation by Stephen Tweedie (sct@redhat.com), 1993 + * Big-endian to little-endian byte-swapping/bitmaps by + * David S. Miller (davem@caip.rutgers.edu), 1995 + */ + +#include +#include +#include "ext3.h" + +/* + * balloc.c contains the blocks allocation and deallocation routines + */ + +/* + * The free blocks are managed by bitmaps. A file system contains several + * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap + * block for inodes, N blocks for the inode table and data blocks. + * + * The file system contains group descriptors which are located after the + * super block. Each descriptor contains the number of the bitmap block and + * the free blocks count in the block. The descriptors are loaded in memory + * when a file system is mounted (see ext3_fill_super). + */ + + +#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) + +/* + * Calculate the block group number and offset, given a block number + */ +static void ext3_get_group_no_and_offset(struct super_block *sb, + ext3_fsblk_t blocknr, unsigned long *blockgrpp, ext3_grpblk_t *offsetp) +{ + struct ext3_super_block *es = EXT3_SB(sb)->s_es; + + blocknr = blocknr - le32_to_cpu(es->s_first_data_block); + if (offsetp) + *offsetp = blocknr % EXT3_BLOCKS_PER_GROUP(sb); + if (blockgrpp) + *blockgrpp = blocknr / EXT3_BLOCKS_PER_GROUP(sb); +} + +/** + * ext3_get_group_desc() -- load group descriptor from disk + * @sb: super block + * @block_group: given block group + * @bh: pointer to the buffer head to store the block + * group descriptor + */ +struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb, + unsigned int block_group, + struct buffer_head ** bh) +{ + unsigned long group_desc; + unsigned long offset; + struct ext3_group_desc * desc; + struct ext3_sb_info *sbi = EXT3_SB(sb); + + if (block_group >= sbi->s_groups_count) { + ext3_error (sb, "ext3_get_group_desc", + "block_group >= groups_count - " + "block_group = %d, groups_count = %lu", + block_group, sbi->s_groups_count); + + return NULL; + } + smp_rmb(); + + group_desc = block_group >> EXT3_DESC_PER_BLOCK_BITS(sb); + offset = block_group & (EXT3_DESC_PER_BLOCK(sb) - 1); + if (!sbi->s_group_desc[group_desc]) { + ext3_error (sb, "ext3_get_group_desc", + "Group descriptor not loaded - " + "block_group = %d, group_desc = %lu, desc = %lu", + block_group, group_desc, offset); + return NULL; + } + + desc = (struct ext3_group_desc *) sbi->s_group_desc[group_desc]->b_data; + if (bh) + *bh = sbi->s_group_desc[group_desc]; + return desc + offset; +} + +static int ext3_valid_block_bitmap(struct super_block *sb, + struct ext3_group_desc *desc, + unsigned int block_group, + struct buffer_head *bh) +{ + ext3_grpblk_t offset; + ext3_grpblk_t next_zero_bit; + ext3_fsblk_t bitmap_blk; + ext3_fsblk_t group_first_block; + + group_first_block = ext3_group_first_block_no(sb, block_group); + + /* check whether block bitmap block number is set */ + bitmap_blk = le32_to_cpu(desc->bg_block_bitmap); + offset = bitmap_blk - group_first_block; + if (!ext3_test_bit(offset, bh->b_data)) + /* bad block bitmap */ + goto err_out; + + /* check whether the inode bitmap block number is set */ + bitmap_blk = le32_to_cpu(desc->bg_inode_bitmap); + offset = bitmap_blk - group_first_block; + if (!ext3_test_bit(offset, bh->b_data)) + /* bad block bitmap */ + goto err_out; + + /* check whether the inode table block number is set */ + bitmap_blk = le32_to_cpu(desc->bg_inode_table); + offset = bitmap_blk - group_first_block; + next_zero_bit = ext3_find_next_zero_bit(bh->b_data, + offset + EXT3_SB(sb)->s_itb_per_group, + offset); + if (next_zero_bit >= offset + EXT3_SB(sb)->s_itb_per_group) + /* good bitmap for inode tables */ + return 1; + +err_out: + ext3_error(sb, __func__, + "Invalid block bitmap - " + "block_group = %d, block = %lu", + block_group, bitmap_blk); + return 0; +} + +/** + * read_block_bitmap() + * @sb: super block + * @block_group: given block group + * + * Read the bitmap for a given block_group,and validate the + * bits for block/inode/inode tables are set in the bitmaps + * + * Return buffer_head on success or NULL in case of failure. + */ +static struct buffer_head * +read_block_bitmap(struct super_block *sb, unsigned int block_group) +{ + struct ext3_group_desc * desc; + struct buffer_head * bh = NULL; + ext3_fsblk_t bitmap_blk; + + desc = ext3_get_group_desc(sb, block_group, NULL); + if (!desc) + return NULL; + trace_ext3_read_block_bitmap(sb, block_group); + bitmap_blk = le32_to_cpu(desc->bg_block_bitmap); + bh = sb_getblk(sb, bitmap_blk); + if (unlikely(!bh)) { + ext3_error(sb, __func__, + "Cannot read block bitmap - " + "block_group = %d, block_bitmap = %u", + block_group, le32_to_cpu(desc->bg_block_bitmap)); + return NULL; + } + if (likely(bh_uptodate_or_lock(bh))) + return bh; + + if (bh_submit_read(bh) < 0) { + brelse(bh); + ext3_error(sb, __func__, + "Cannot read block bitmap - " + "block_group = %d, block_bitmap = %u", + block_group, le32_to_cpu(desc->bg_block_bitmap)); + return NULL; + } + ext3_valid_block_bitmap(sb, desc, block_group, bh); + /* + * file system mounted not to panic on error, continue with corrupt + * bitmap + */ + return bh; +} +/* + * The reservation window structure operations + * -------------------------------------------- + * Operations include: + * dump, find, add, remove, is_empty, find_next_reservable_window, etc. + * + * We use a red-black tree to represent per-filesystem reservation + * windows. + * + */ + +/** + * __rsv_window_dump() -- Dump the filesystem block allocation reservation map + * @rb_root: root of per-filesystem reservation rb tree + * @verbose: verbose mode + * @fn: function which wishes to dump the reservation map + * + * If verbose is turned on, it will print the whole block reservation + * windows(start, end). Otherwise, it will only print out the "bad" windows, + * those windows that overlap with their immediate neighbors. + */ +#if 1 +static void __rsv_window_dump(struct rb_root *root, int verbose, + const char *fn) +{ + struct rb_node *n; + struct ext3_reserve_window_node *rsv, *prev; + int bad; + +restart: + n = rb_first(root); + bad = 0; + prev = NULL; + + printk("Block Allocation Reservation Windows Map (%s):\n", fn); + while (n) { + rsv = rb_entry(n, struct ext3_reserve_window_node, rsv_node); + if (verbose) + printk("reservation window 0x%p " + "start: %lu, end: %lu\n", + rsv, rsv->rsv_start, rsv->rsv_end); + if (rsv->rsv_start && rsv->rsv_start >= rsv->rsv_end) { + printk("Bad reservation %p (start >= end)\n", + rsv); + bad = 1; + } + if (prev && prev->rsv_end >= rsv->rsv_start) { + printk("Bad reservation %p (prev->end >= start)\n", + rsv); + bad = 1; + } + if (bad) { + if (!verbose) { + printk("Restarting reservation walk in verbose mode\n"); + verbose = 1; + goto restart; + } + } + n = rb_next(n); + prev = rsv; + } + printk("Window map complete.\n"); + BUG_ON(bad); +} +#define rsv_window_dump(root, verbose) \ + __rsv_window_dump((root), (verbose), __func__) +#else +#define rsv_window_dump(root, verbose) do {} while (0) +#endif + +/** + * goal_in_my_reservation() + * @rsv: inode's reservation window + * @grp_goal: given goal block relative to the allocation block group + * @group: the current allocation block group + * @sb: filesystem super block + * + * Test if the given goal block (group relative) is within the file's + * own block reservation window range. + * + * If the reservation window is outside the goal allocation group, return 0; + * grp_goal (given goal block) could be -1, which means no specific + * goal block. In this case, always return 1. + * If the goal block is within the reservation window, return 1; + * otherwise, return 0; + */ +static int +goal_in_my_reservation(struct ext3_reserve_window *rsv, ext3_grpblk_t grp_goal, + unsigned int group, struct super_block * sb) +{ + ext3_fsblk_t group_first_block, group_last_block; + + group_first_block = ext3_group_first_block_no(sb, group); + group_last_block = group_first_block + (EXT3_BLOCKS_PER_GROUP(sb) - 1); + + if ((rsv->_rsv_start > group_last_block) || + (rsv->_rsv_end < group_first_block)) + return 0; + if ((grp_goal >= 0) && ((grp_goal + group_first_block < rsv->_rsv_start) + || (grp_goal + group_first_block > rsv->_rsv_end))) + return 0; + return 1; +} + +/** + * search_reserve_window() + * @rb_root: root of reservation tree + * @goal: target allocation block + * + * Find the reserved window which includes the goal, or the previous one + * if the goal is not in any window. + * Returns NULL if there are no windows or if all windows start after the goal. + */ +static struct ext3_reserve_window_node * +search_reserve_window(struct rb_root *root, ext3_fsblk_t goal) +{ + struct rb_node *n = root->rb_node; + struct ext3_reserve_window_node *rsv; + + if (!n) + return NULL; + + do { + rsv = rb_entry(n, struct ext3_reserve_window_node, rsv_node); + + if (goal < rsv->rsv_start) + n = n->rb_left; + else if (goal > rsv->rsv_end) + n = n->rb_right; + else + return rsv; + } while (n); + /* + * We've fallen off the end of the tree: the goal wasn't inside + * any particular node. OK, the previous node must be to one + * side of the interval containing the goal. If it's the RHS, + * we need to back up one. + */ + if (rsv->rsv_start > goal) { + n = rb_prev(&rsv->rsv_node); + rsv = rb_entry(n, struct ext3_reserve_window_node, rsv_node); + } + return rsv; +} + +/** + * ext3_rsv_window_add() -- Insert a window to the block reservation rb tree. + * @sb: super block + * @rsv: reservation window to add + * + * Must be called with rsv_lock hold. + */ +void ext3_rsv_window_add(struct super_block *sb, + struct ext3_reserve_window_node *rsv) +{ + struct rb_root *root = &EXT3_SB(sb)->s_rsv_window_root; + struct rb_node *node = &rsv->rsv_node; + ext3_fsblk_t start = rsv->rsv_start; + + struct rb_node ** p = &root->rb_node; + struct rb_node * parent = NULL; + struct ext3_reserve_window_node *this; + + trace_ext3_rsv_window_add(sb, rsv); + while (*p) + { + parent = *p; + this = rb_entry(parent, struct ext3_reserve_window_node, rsv_node); + + if (start < this->rsv_start) + p = &(*p)->rb_left; + else if (start > this->rsv_end) + p = &(*p)->rb_right; + else { + rsv_window_dump(root, 1); + BUG(); + } + } + + rb_link_node(node, parent, p); + rb_insert_color(node, root); +} + +/** + * ext3_rsv_window_remove() -- unlink a window from the reservation rb tree + * @sb: super block + * @rsv: reservation window to remove + * + * Mark the block reservation window as not allocated, and unlink it + * from the filesystem reservation window rb tree. Must be called with + * rsv_lock hold. + */ +static void rsv_window_remove(struct super_block *sb, + struct ext3_reserve_window_node *rsv) +{ + rsv->rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; + rsv->rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; + rsv->rsv_alloc_hit = 0; + rb_erase(&rsv->rsv_node, &EXT3_SB(sb)->s_rsv_window_root); +} + +/* + * rsv_is_empty() -- Check if the reservation window is allocated. + * @rsv: given reservation window to check + * + * returns 1 if the end block is EXT3_RESERVE_WINDOW_NOT_ALLOCATED. + */ +static inline int rsv_is_empty(struct ext3_reserve_window *rsv) +{ + /* a valid reservation end block could not be 0 */ + return rsv->_rsv_end == EXT3_RESERVE_WINDOW_NOT_ALLOCATED; +} + +/** + * ext3_init_block_alloc_info() + * @inode: file inode structure + * + * Allocate and initialize the reservation window structure, and + * link the window to the ext3 inode structure at last + * + * The reservation window structure is only dynamically allocated + * and linked to ext3 inode the first time the open file + * needs a new block. So, before every ext3_new_block(s) call, for + * regular files, we should check whether the reservation window + * structure exists or not. In the latter case, this function is called. + * Fail to do so will result in block reservation being turned off for that + * open file. + * + * This function is called from ext3_get_blocks_handle(), also called + * when setting the reservation window size through ioctl before the file + * is open for write (needs block allocation). + * + * Needs truncate_mutex protection prior to call this function. + */ +void ext3_init_block_alloc_info(struct inode *inode) +{ + struct ext3_inode_info *ei = EXT3_I(inode); + struct ext3_block_alloc_info *block_i; + struct super_block *sb = inode->i_sb; + + block_i = kmalloc(sizeof(*block_i), GFP_NOFS); + if (block_i) { + struct ext3_reserve_window_node *rsv = &block_i->rsv_window_node; + + rsv->rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; + rsv->rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; + + /* + * if filesystem is mounted with NORESERVATION, the goal + * reservation window size is set to zero to indicate + * block reservation is off + */ + if (!test_opt(sb, RESERVATION)) + rsv->rsv_goal_size = 0; + else + rsv->rsv_goal_size = EXT3_DEFAULT_RESERVE_BLOCKS; + rsv->rsv_alloc_hit = 0; + block_i->last_alloc_logical_block = 0; + block_i->last_alloc_physical_block = 0; + } + ei->i_block_alloc_info = block_i; +} + +/** + * ext3_discard_reservation() + * @inode: inode + * + * Discard(free) block reservation window on last file close, or truncate + * or at last iput(). + * + * It is being called in three cases: + * ext3_release_file(): last writer close the file + * ext3_clear_inode(): last iput(), when nobody link to this file. + * ext3_truncate(): when the block indirect map is about to change. + * + */ +void ext3_discard_reservation(struct inode *inode) +{ + struct ext3_inode_info *ei = EXT3_I(inode); + struct ext3_block_alloc_info *block_i = ei->i_block_alloc_info; + struct ext3_reserve_window_node *rsv; + spinlock_t *rsv_lock = &EXT3_SB(inode->i_sb)->s_rsv_window_lock; + + if (!block_i) + return; + + rsv = &block_i->rsv_window_node; + if (!rsv_is_empty(&rsv->rsv_window)) { + spin_lock(rsv_lock); + if (!rsv_is_empty(&rsv->rsv_window)) { + trace_ext3_discard_reservation(inode, rsv); + rsv_window_remove(inode->i_sb, rsv); + } + spin_unlock(rsv_lock); + } +} + +/** + * ext3_free_blocks_sb() -- Free given blocks and update quota + * @handle: handle to this transaction + * @sb: super block + * @block: start physical block to free + * @count: number of blocks to free + * @pdquot_freed_blocks: pointer to quota + */ +void ext3_free_blocks_sb(handle_t *handle, struct super_block *sb, + ext3_fsblk_t block, unsigned long count, + unsigned long *pdquot_freed_blocks) +{ + struct buffer_head *bitmap_bh = NULL; + struct buffer_head *gd_bh; + unsigned long block_group; + ext3_grpblk_t bit; + unsigned long i; + unsigned long overflow; + struct ext3_group_desc * desc; + struct ext3_super_block * es; + struct ext3_sb_info *sbi; + int err = 0, ret; + ext3_grpblk_t group_freed; + + *pdquot_freed_blocks = 0; + sbi = EXT3_SB(sb); + es = sbi->s_es; + if (block < le32_to_cpu(es->s_first_data_block) || + block + count < block || + block + count > le32_to_cpu(es->s_blocks_count)) { + ext3_error (sb, "ext3_free_blocks", + "Freeing blocks not in datazone - " + "block = "E3FSBLK", count = %lu", block, count); + goto error_return; + } + + ext3_debug ("freeing block(s) %lu-%lu\n", block, block + count - 1); + +do_more: + overflow = 0; + block_group = (block - le32_to_cpu(es->s_first_data_block)) / + EXT3_BLOCKS_PER_GROUP(sb); + bit = (block - le32_to_cpu(es->s_first_data_block)) % + EXT3_BLOCKS_PER_GROUP(sb); + /* + * Check to see if we are freeing blocks across a group + * boundary. + */ + if (bit + count > EXT3_BLOCKS_PER_GROUP(sb)) { + overflow = bit + count - EXT3_BLOCKS_PER_GROUP(sb); + count -= overflow; + } + brelse(bitmap_bh); + bitmap_bh = read_block_bitmap(sb, block_group); + if (!bitmap_bh) + goto error_return; + desc = ext3_get_group_desc (sb, block_group, &gd_bh); + if (!desc) + goto error_return; + + if (in_range (le32_to_cpu(desc->bg_block_bitmap), block, count) || + in_range (le32_to_cpu(desc->bg_inode_bitmap), block, count) || + in_range (block, le32_to_cpu(desc->bg_inode_table), + sbi->s_itb_per_group) || + in_range (block + count - 1, le32_to_cpu(desc->bg_inode_table), + sbi->s_itb_per_group)) { + ext3_error (sb, "ext3_free_blocks", + "Freeing blocks in system zones - " + "Block = "E3FSBLK", count = %lu", + block, count); + goto error_return; + } + + /* + * We are about to start releasing blocks in the bitmap, + * so we need undo access. + */ + /* @@@ check errors */ + BUFFER_TRACE(bitmap_bh, "getting undo access"); + err = ext3_journal_get_undo_access(handle, bitmap_bh); + if (err) + goto error_return; + + /* + * We are about to modify some metadata. Call the journal APIs + * to unshare ->b_data if a currently-committing transaction is + * using it + */ + BUFFER_TRACE(gd_bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, gd_bh); + if (err) + goto error_return; + + jbd_lock_bh_state(bitmap_bh); + + for (i = 0, group_freed = 0; i < count; i++) { + /* + * An HJ special. This is expensive... + */ +#ifdef CONFIG_JBD_DEBUG + jbd_unlock_bh_state(bitmap_bh); + { + struct buffer_head *debug_bh; + debug_bh = sb_find_get_block(sb, block + i); + if (debug_bh) { + BUFFER_TRACE(debug_bh, "Deleted!"); + if (!bh2jh(bitmap_bh)->b_committed_data) + BUFFER_TRACE(debug_bh, + "No committed data in bitmap"); + BUFFER_TRACE2(debug_bh, bitmap_bh, "bitmap"); + __brelse(debug_bh); + } + } + jbd_lock_bh_state(bitmap_bh); +#endif + if (need_resched()) { + jbd_unlock_bh_state(bitmap_bh); + cond_resched(); + jbd_lock_bh_state(bitmap_bh); + } + /* @@@ This prevents newly-allocated data from being + * freed and then reallocated within the same + * transaction. + * + * Ideally we would want to allow that to happen, but to + * do so requires making journal_forget() capable of + * revoking the queued write of a data block, which + * implies blocking on the journal lock. *forget() + * cannot block due to truncate races. + * + * Eventually we can fix this by making journal_forget() + * return a status indicating whether or not it was able + * to revoke the buffer. On successful revoke, it is + * safe not to set the allocation bit in the committed + * bitmap, because we know that there is no outstanding + * activity on the buffer any more and so it is safe to + * reallocate it. + */ + BUFFER_TRACE(bitmap_bh, "set in b_committed_data"); + J_ASSERT_BH(bitmap_bh, + bh2jh(bitmap_bh)->b_committed_data != NULL); + ext3_set_bit_atomic(sb_bgl_lock(sbi, block_group), bit + i, + bh2jh(bitmap_bh)->b_committed_data); + + /* + * We clear the bit in the bitmap after setting the committed + * data bit, because this is the reverse order to that which + * the allocator uses. + */ + BUFFER_TRACE(bitmap_bh, "clear bit"); + if (!ext3_clear_bit_atomic(sb_bgl_lock(sbi, block_group), + bit + i, bitmap_bh->b_data)) { + jbd_unlock_bh_state(bitmap_bh); + ext3_error(sb, __func__, + "bit already cleared for block "E3FSBLK, + block + i); + jbd_lock_bh_state(bitmap_bh); + BUFFER_TRACE(bitmap_bh, "bit already cleared"); + } else { + group_freed++; + } + } + jbd_unlock_bh_state(bitmap_bh); + + spin_lock(sb_bgl_lock(sbi, block_group)); + le16_add_cpu(&desc->bg_free_blocks_count, group_freed); + spin_unlock(sb_bgl_lock(sbi, block_group)); + percpu_counter_add(&sbi->s_freeblocks_counter, count); + + /* We dirtied the bitmap block */ + BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); + err = ext3_journal_dirty_metadata(handle, bitmap_bh); + + /* And the group descriptor block */ + BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); + ret = ext3_journal_dirty_metadata(handle, gd_bh); + if (!err) err = ret; + *pdquot_freed_blocks += group_freed; + + if (overflow && !err) { + block += count; + count = overflow; + goto do_more; + } + +error_return: + brelse(bitmap_bh); + ext3_std_error(sb, err); + return; +} + +/** + * ext3_free_blocks() -- Free given blocks and update quota + * @handle: handle for this transaction + * @inode: inode + * @block: start physical block to free + * @count: number of blocks to count + */ +void ext3_free_blocks(handle_t *handle, struct inode *inode, + ext3_fsblk_t block, unsigned long count) +{ + struct super_block *sb = inode->i_sb; + unsigned long dquot_freed_blocks; + + trace_ext3_free_blocks(inode, block, count); + ext3_free_blocks_sb(handle, sb, block, count, &dquot_freed_blocks); + if (dquot_freed_blocks) + dquot_free_block(inode, dquot_freed_blocks); + return; +} + +/** + * ext3_test_allocatable() + * @nr: given allocation block group + * @bh: bufferhead contains the bitmap of the given block group + * + * For ext3 allocations, we must not reuse any blocks which are + * allocated in the bitmap buffer's "last committed data" copy. This + * prevents deletes from freeing up the page for reuse until we have + * committed the delete transaction. + * + * If we didn't do this, then deleting something and reallocating it as + * data would allow the old block to be overwritten before the + * transaction committed (because we force data to disk before commit). + * This would lead to corruption if we crashed between overwriting the + * data and committing the delete. + * + * @@@ We may want to make this allocation behaviour conditional on + * data-writes at some point, and disable it for metadata allocations or + * sync-data inodes. + */ +static int ext3_test_allocatable(ext3_grpblk_t nr, struct buffer_head *bh) +{ + int ret; + struct journal_head *jh = bh2jh(bh); + + if (ext3_test_bit(nr, bh->b_data)) + return 0; + + jbd_lock_bh_state(bh); + if (!jh->b_committed_data) + ret = 1; + else + ret = !ext3_test_bit(nr, jh->b_committed_data); + jbd_unlock_bh_state(bh); + return ret; +} + +/** + * bitmap_search_next_usable_block() + * @start: the starting block (group relative) of the search + * @bh: bufferhead contains the block group bitmap + * @maxblocks: the ending block (group relative) of the reservation + * + * The bitmap search --- search forward alternately through the actual + * bitmap on disk and the last-committed copy in journal, until we find a + * bit free in both bitmaps. + */ +static ext3_grpblk_t +bitmap_search_next_usable_block(ext3_grpblk_t start, struct buffer_head *bh, + ext3_grpblk_t maxblocks) +{ + ext3_grpblk_t next; + struct journal_head *jh = bh2jh(bh); + + while (start < maxblocks) { + next = ext3_find_next_zero_bit(bh->b_data, maxblocks, start); + if (next >= maxblocks) + return -1; + if (ext3_test_allocatable(next, bh)) + return next; + jbd_lock_bh_state(bh); + if (jh->b_committed_data) + start = ext3_find_next_zero_bit(jh->b_committed_data, + maxblocks, next); + jbd_unlock_bh_state(bh); + } + return -1; +} + +/** + * find_next_usable_block() + * @start: the starting block (group relative) to find next + * allocatable block in bitmap. + * @bh: bufferhead contains the block group bitmap + * @maxblocks: the ending block (group relative) for the search + * + * Find an allocatable block in a bitmap. We honor both the bitmap and + * its last-committed copy (if that exists), and perform the "most + * appropriate allocation" algorithm of looking for a free block near + * the initial goal; then for a free byte somewhere in the bitmap; then + * for any free bit in the bitmap. + */ +static ext3_grpblk_t +find_next_usable_block(ext3_grpblk_t start, struct buffer_head *bh, + ext3_grpblk_t maxblocks) +{ + ext3_grpblk_t here, next; + char *p, *r; + + if (start > 0) { + /* + * The goal was occupied; search forward for a free + * block within the next XX blocks. + * + * end_goal is more or less random, but it has to be + * less than EXT3_BLOCKS_PER_GROUP. Aligning up to the + * next 64-bit boundary is simple.. + */ + ext3_grpblk_t end_goal = (start + 63) & ~63; + if (end_goal > maxblocks) + end_goal = maxblocks; + here = ext3_find_next_zero_bit(bh->b_data, end_goal, start); + if (here < end_goal && ext3_test_allocatable(here, bh)) + return here; + ext3_debug("Bit not found near goal\n"); + } + + here = start; + if (here < 0) + here = 0; + + p = bh->b_data + (here >> 3); + r = memscan(p, 0, ((maxblocks + 7) >> 3) - (here >> 3)); + next = (r - bh->b_data) << 3; + + if (next < maxblocks && next >= start && ext3_test_allocatable(next, bh)) + return next; + + /* + * The bitmap search --- search forward alternately through the actual + * bitmap and the last-committed copy until we find a bit free in + * both + */ + here = bitmap_search_next_usable_block(here, bh, maxblocks); + return here; +} + +/** + * claim_block() + * @lock: the spin lock for this block group + * @block: the free block (group relative) to allocate + * @bh: the buffer_head contains the block group bitmap + * + * We think we can allocate this block in this bitmap. Try to set the bit. + * If that succeeds then check that nobody has allocated and then freed the + * block since we saw that is was not marked in b_committed_data. If it _was_ + * allocated and freed then clear the bit in the bitmap again and return + * zero (failure). + */ +static inline int +claim_block(spinlock_t *lock, ext3_grpblk_t block, struct buffer_head *bh) +{ + struct journal_head *jh = bh2jh(bh); + int ret; + + if (ext3_set_bit_atomic(lock, block, bh->b_data)) + return 0; + jbd_lock_bh_state(bh); + if (jh->b_committed_data && ext3_test_bit(block,jh->b_committed_data)) { + ext3_clear_bit_atomic(lock, block, bh->b_data); + ret = 0; + } else { + ret = 1; + } + jbd_unlock_bh_state(bh); + return ret; +} + +/** + * ext3_try_to_allocate() + * @sb: superblock + * @handle: handle to this transaction + * @group: given allocation block group + * @bitmap_bh: bufferhead holds the block bitmap + * @grp_goal: given target block within the group + * @count: target number of blocks to allocate + * @my_rsv: reservation window + * + * Attempt to allocate blocks within a give range. Set the range of allocation + * first, then find the first free bit(s) from the bitmap (within the range), + * and at last, allocate the blocks by claiming the found free bit as allocated. + * + * To set the range of this allocation: + * if there is a reservation window, only try to allocate block(s) from the + * file's own reservation window; + * Otherwise, the allocation range starts from the give goal block, ends at + * the block group's last block. + * + * If we failed to allocate the desired block then we may end up crossing to a + * new bitmap. In that case we must release write access to the old one via + * ext3_journal_release_buffer(), else we'll run out of credits. + */ +static ext3_grpblk_t +ext3_try_to_allocate(struct super_block *sb, handle_t *handle, int group, + struct buffer_head *bitmap_bh, ext3_grpblk_t grp_goal, + unsigned long *count, struct ext3_reserve_window *my_rsv) +{ + ext3_fsblk_t group_first_block; + ext3_grpblk_t start, end; + unsigned long num = 0; + + /* we do allocation within the reservation window if we have a window */ + if (my_rsv) { + group_first_block = ext3_group_first_block_no(sb, group); + if (my_rsv->_rsv_start >= group_first_block) + start = my_rsv->_rsv_start - group_first_block; + else + /* reservation window cross group boundary */ + start = 0; + end = my_rsv->_rsv_end - group_first_block + 1; + if (end > EXT3_BLOCKS_PER_GROUP(sb)) + /* reservation window crosses group boundary */ + end = EXT3_BLOCKS_PER_GROUP(sb); + if ((start <= grp_goal) && (grp_goal < end)) + start = grp_goal; + else + grp_goal = -1; + } else { + if (grp_goal > 0) + start = grp_goal; + else + start = 0; + end = EXT3_BLOCKS_PER_GROUP(sb); + } + + BUG_ON(start > EXT3_BLOCKS_PER_GROUP(sb)); + +repeat: + if (grp_goal < 0 || !ext3_test_allocatable(grp_goal, bitmap_bh)) { + grp_goal = find_next_usable_block(start, bitmap_bh, end); + if (grp_goal < 0) + goto fail_access; + if (!my_rsv) { + int i; + + for (i = 0; i < 7 && grp_goal > start && + ext3_test_allocatable(grp_goal - 1, + bitmap_bh); + i++, grp_goal--) + ; + } + } + start = grp_goal; + + if (!claim_block(sb_bgl_lock(EXT3_SB(sb), group), + grp_goal, bitmap_bh)) { + /* + * The block was allocated by another thread, or it was + * allocated and then freed by another thread + */ + start++; + grp_goal++; + if (start >= end) + goto fail_access; + goto repeat; + } + num++; + grp_goal++; + while (num < *count && grp_goal < end + && ext3_test_allocatable(grp_goal, bitmap_bh) + && claim_block(sb_bgl_lock(EXT3_SB(sb), group), + grp_goal, bitmap_bh)) { + num++; + grp_goal++; + } + *count = num; + return grp_goal - num; +fail_access: + *count = num; + return -1; +} + +/** + * find_next_reservable_window(): + * find a reservable space within the given range. + * It does not allocate the reservation window for now: + * alloc_new_reservation() will do the work later. + * + * @search_head: the head of the searching list; + * This is not necessarily the list head of the whole filesystem + * + * We have both head and start_block to assist the search + * for the reservable space. The list starts from head, + * but we will shift to the place where start_block is, + * then start from there, when looking for a reservable space. + * + * @my_rsv: the reservation window + * + * @sb: the super block + * + * @start_block: the first block we consider to start + * the real search from + * + * @last_block: + * the maximum block number that our goal reservable space + * could start from. This is normally the last block in this + * group. The search will end when we found the start of next + * possible reservable space is out of this boundary. + * This could handle the cross boundary reservation window + * request. + * + * basically we search from the given range, rather than the whole + * reservation double linked list, (start_block, last_block) + * to find a free region that is of my size and has not + * been reserved. + * + */ +static int find_next_reservable_window( + struct ext3_reserve_window_node *search_head, + struct ext3_reserve_window_node *my_rsv, + struct super_block * sb, + ext3_fsblk_t start_block, + ext3_fsblk_t last_block) +{ + struct rb_node *next; + struct ext3_reserve_window_node *rsv, *prev; + ext3_fsblk_t cur; + int size = my_rsv->rsv_goal_size; + + /* TODO: make the start of the reservation window byte-aligned */ + /* cur = *start_block & ~7;*/ + cur = start_block; + rsv = search_head; + if (!rsv) + return -1; + + while (1) { + if (cur <= rsv->rsv_end) + cur = rsv->rsv_end + 1; + + /* TODO? + * in the case we could not find a reservable space + * that is what is expected, during the re-search, we could + * remember what's the largest reservable space we could have + * and return that one. + * + * For now it will fail if we could not find the reservable + * space with expected-size (or more)... + */ + if (cur > last_block) + return -1; /* fail */ + + prev = rsv; + next = rb_next(&rsv->rsv_node); + rsv = rb_entry(next,struct ext3_reserve_window_node,rsv_node); + + /* + * Reached the last reservation, we can just append to the + * previous one. + */ + if (!next) + break; + + if (cur + size <= rsv->rsv_start) { + /* + * Found a reserveable space big enough. We could + * have a reservation across the group boundary here + */ + break; + } + } + /* + * we come here either : + * when we reach the end of the whole list, + * and there is empty reservable space after last entry in the list. + * append it to the end of the list. + * + * or we found one reservable space in the middle of the list, + * return the reservation window that we could append to. + * succeed. + */ + + if ((prev != my_rsv) && (!rsv_is_empty(&my_rsv->rsv_window))) + rsv_window_remove(sb, my_rsv); + + /* + * Let's book the whole available window for now. We will check the + * disk bitmap later and then, if there are free blocks then we adjust + * the window size if it's larger than requested. + * Otherwise, we will remove this node from the tree next time + * call find_next_reservable_window. + */ + my_rsv->rsv_start = cur; + my_rsv->rsv_end = cur + size - 1; + my_rsv->rsv_alloc_hit = 0; + + if (prev != my_rsv) + ext3_rsv_window_add(sb, my_rsv); + + return 0; +} + +/** + * alloc_new_reservation()--allocate a new reservation window + * + * To make a new reservation, we search part of the filesystem + * reservation list (the list that inside the group). We try to + * allocate a new reservation window near the allocation goal, + * or the beginning of the group, if there is no goal. + * + * We first find a reservable space after the goal, then from + * there, we check the bitmap for the first free block after + * it. If there is no free block until the end of group, then the + * whole group is full, we failed. Otherwise, check if the free + * block is inside the expected reservable space, if so, we + * succeed. + * If the first free block is outside the reservable space, then + * start from the first free block, we search for next available + * space, and go on. + * + * on succeed, a new reservation will be found and inserted into the list + * It contains at least one free block, and it does not overlap with other + * reservation windows. + * + * failed: we failed to find a reservation window in this group + * + * @my_rsv: the reservation window + * + * @grp_goal: The goal (group-relative). It is where the search for a + * free reservable space should start from. + * if we have a grp_goal(grp_goal >0 ), then start from there, + * no grp_goal(grp_goal = -1), we start from the first block + * of the group. + * + * @sb: the super block + * @group: the group we are trying to allocate in + * @bitmap_bh: the block group block bitmap + * + */ +static int alloc_new_reservation(struct ext3_reserve_window_node *my_rsv, + ext3_grpblk_t grp_goal, struct super_block *sb, + unsigned int group, struct buffer_head *bitmap_bh) +{ + struct ext3_reserve_window_node *search_head; + ext3_fsblk_t group_first_block, group_end_block, start_block; + ext3_grpblk_t first_free_block; + struct rb_root *fs_rsv_root = &EXT3_SB(sb)->s_rsv_window_root; + unsigned long size; + int ret; + spinlock_t *rsv_lock = &EXT3_SB(sb)->s_rsv_window_lock; + + group_first_block = ext3_group_first_block_no(sb, group); + group_end_block = group_first_block + (EXT3_BLOCKS_PER_GROUP(sb) - 1); + + if (grp_goal < 0) + start_block = group_first_block; + else + start_block = grp_goal + group_first_block; + + trace_ext3_alloc_new_reservation(sb, start_block); + size = my_rsv->rsv_goal_size; + + if (!rsv_is_empty(&my_rsv->rsv_window)) { + /* + * if the old reservation is cross group boundary + * and if the goal is inside the old reservation window, + * we will come here when we just failed to allocate from + * the first part of the window. We still have another part + * that belongs to the next group. In this case, there is no + * point to discard our window and try to allocate a new one + * in this group(which will fail). we should + * keep the reservation window, just simply move on. + * + * Maybe we could shift the start block of the reservation + * window to the first block of next group. + */ + + if ((my_rsv->rsv_start <= group_end_block) && + (my_rsv->rsv_end > group_end_block) && + (start_block >= my_rsv->rsv_start)) + return -1; + + if ((my_rsv->rsv_alloc_hit > + (my_rsv->rsv_end - my_rsv->rsv_start + 1) / 2)) { + /* + * if the previously allocation hit ratio is + * greater than 1/2, then we double the size of + * the reservation window the next time, + * otherwise we keep the same size window + */ + size = size * 2; + if (size > EXT3_MAX_RESERVE_BLOCKS) + size = EXT3_MAX_RESERVE_BLOCKS; + my_rsv->rsv_goal_size= size; + } + } + + spin_lock(rsv_lock); + /* + * shift the search start to the window near the goal block + */ + search_head = search_reserve_window(fs_rsv_root, start_block); + + /* + * find_next_reservable_window() simply finds a reservable window + * inside the given range(start_block, group_end_block). + * + * To make sure the reservation window has a free bit inside it, we + * need to check the bitmap after we found a reservable window. + */ +retry: + ret = find_next_reservable_window(search_head, my_rsv, sb, + start_block, group_end_block); + + if (ret == -1) { + if (!rsv_is_empty(&my_rsv->rsv_window)) + rsv_window_remove(sb, my_rsv); + spin_unlock(rsv_lock); + return -1; + } + + /* + * On success, find_next_reservable_window() returns the + * reservation window where there is a reservable space after it. + * Before we reserve this reservable space, we need + * to make sure there is at least a free block inside this region. + * + * searching the first free bit on the block bitmap and copy of + * last committed bitmap alternatively, until we found a allocatable + * block. Search start from the start block of the reservable space + * we just found. + */ + spin_unlock(rsv_lock); + first_free_block = bitmap_search_next_usable_block( + my_rsv->rsv_start - group_first_block, + bitmap_bh, group_end_block - group_first_block + 1); + + if (first_free_block < 0) { + /* + * no free block left on the bitmap, no point + * to reserve the space. return failed. + */ + spin_lock(rsv_lock); + if (!rsv_is_empty(&my_rsv->rsv_window)) + rsv_window_remove(sb, my_rsv); + spin_unlock(rsv_lock); + return -1; /* failed */ + } + + start_block = first_free_block + group_first_block; + /* + * check if the first free block is within the + * free space we just reserved + */ + if (start_block >= my_rsv->rsv_start && + start_block <= my_rsv->rsv_end) { + trace_ext3_reserved(sb, start_block, my_rsv); + return 0; /* success */ + } + /* + * if the first free bit we found is out of the reservable space + * continue search for next reservable space, + * start from where the free block is, + * we also shift the list head to where we stopped last time + */ + search_head = my_rsv; + spin_lock(rsv_lock); + goto retry; +} + +/** + * try_to_extend_reservation() + * @my_rsv: given reservation window + * @sb: super block + * @size: the delta to extend + * + * Attempt to expand the reservation window large enough to have + * required number of free blocks + * + * Since ext3_try_to_allocate() will always allocate blocks within + * the reservation window range, if the window size is too small, + * multiple blocks allocation has to stop at the end of the reservation + * window. To make this more efficient, given the total number of + * blocks needed and the current size of the window, we try to + * expand the reservation window size if necessary on a best-effort + * basis before ext3_new_blocks() tries to allocate blocks, + */ +static void try_to_extend_reservation(struct ext3_reserve_window_node *my_rsv, + struct super_block *sb, int size) +{ + struct ext3_reserve_window_node *next_rsv; + struct rb_node *next; + spinlock_t *rsv_lock = &EXT3_SB(sb)->s_rsv_window_lock; + + if (!spin_trylock(rsv_lock)) + return; + + next = rb_next(&my_rsv->rsv_node); + + if (!next) + my_rsv->rsv_end += size; + else { + next_rsv = rb_entry(next, struct ext3_reserve_window_node, rsv_node); + + if ((next_rsv->rsv_start - my_rsv->rsv_end - 1) >= size) + my_rsv->rsv_end += size; + else + my_rsv->rsv_end = next_rsv->rsv_start - 1; + } + spin_unlock(rsv_lock); +} + +/** + * ext3_try_to_allocate_with_rsv() + * @sb: superblock + * @handle: handle to this transaction + * @group: given allocation block group + * @bitmap_bh: bufferhead holds the block bitmap + * @grp_goal: given target block within the group + * @my_rsv: reservation window + * @count: target number of blocks to allocate + * @errp: pointer to store the error code + * + * This is the main function used to allocate a new block and its reservation + * window. + * + * Each time when a new block allocation is need, first try to allocate from + * its own reservation. If it does not have a reservation window, instead of + * looking for a free bit on bitmap first, then look up the reservation list to + * see if it is inside somebody else's reservation window, we try to allocate a + * reservation window for it starting from the goal first. Then do the block + * allocation within the reservation window. + * + * This will avoid keeping on searching the reservation list again and + * again when somebody is looking for a free block (without + * reservation), and there are lots of free blocks, but they are all + * being reserved. + * + * We use a red-black tree for the per-filesystem reservation list. + * + */ +static ext3_grpblk_t +ext3_try_to_allocate_with_rsv(struct super_block *sb, handle_t *handle, + unsigned int group, struct buffer_head *bitmap_bh, + ext3_grpblk_t grp_goal, + struct ext3_reserve_window_node * my_rsv, + unsigned long *count, int *errp) +{ + ext3_fsblk_t group_first_block, group_last_block; + ext3_grpblk_t ret = 0; + int fatal; + unsigned long num = *count; + + *errp = 0; + + /* + * Make sure we use undo access for the bitmap, because it is critical + * that we do the frozen_data COW on bitmap buffers in all cases even + * if the buffer is in BJ_Forget state in the committing transaction. + */ + BUFFER_TRACE(bitmap_bh, "get undo access for new block"); + fatal = ext3_journal_get_undo_access(handle, bitmap_bh); + if (fatal) { + *errp = fatal; + return -1; + } + + /* + * we don't deal with reservation when + * filesystem is mounted without reservation + * or the file is not a regular file + * or last attempt to allocate a block with reservation turned on failed + */ + if (my_rsv == NULL ) { + ret = ext3_try_to_allocate(sb, handle, group, bitmap_bh, + grp_goal, count, NULL); + goto out; + } + /* + * grp_goal is a group relative block number (if there is a goal) + * 0 <= grp_goal < EXT3_BLOCKS_PER_GROUP(sb) + * first block is a filesystem wide block number + * first block is the block number of the first block in this group + */ + group_first_block = ext3_group_first_block_no(sb, group); + group_last_block = group_first_block + (EXT3_BLOCKS_PER_GROUP(sb) - 1); + + /* + * Basically we will allocate a new block from inode's reservation + * window. + * + * We need to allocate a new reservation window, if: + * a) inode does not have a reservation window; or + * b) last attempt to allocate a block from existing reservation + * failed; or + * c) we come here with a goal and with a reservation window + * + * We do not need to allocate a new reservation window if we come here + * at the beginning with a goal and the goal is inside the window, or + * we don't have a goal but already have a reservation window. + * then we could go to allocate from the reservation window directly. + */ + while (1) { + if (rsv_is_empty(&my_rsv->rsv_window) || (ret < 0) || + !goal_in_my_reservation(&my_rsv->rsv_window, + grp_goal, group, sb)) { + if (my_rsv->rsv_goal_size < *count) + my_rsv->rsv_goal_size = *count; + ret = alloc_new_reservation(my_rsv, grp_goal, sb, + group, bitmap_bh); + if (ret < 0) + break; /* failed */ + + if (!goal_in_my_reservation(&my_rsv->rsv_window, + grp_goal, group, sb)) + grp_goal = -1; + } else if (grp_goal >= 0) { + int curr = my_rsv->rsv_end - + (grp_goal + group_first_block) + 1; + + if (curr < *count) + try_to_extend_reservation(my_rsv, sb, + *count - curr); + } + + if ((my_rsv->rsv_start > group_last_block) || + (my_rsv->rsv_end < group_first_block)) { + rsv_window_dump(&EXT3_SB(sb)->s_rsv_window_root, 1); + BUG(); + } + ret = ext3_try_to_allocate(sb, handle, group, bitmap_bh, + grp_goal, &num, &my_rsv->rsv_window); + if (ret >= 0) { + my_rsv->rsv_alloc_hit += num; + *count = num; + break; /* succeed */ + } + num = *count; + } +out: + if (ret >= 0) { + BUFFER_TRACE(bitmap_bh, "journal_dirty_metadata for " + "bitmap block"); + fatal = ext3_journal_dirty_metadata(handle, bitmap_bh); + if (fatal) { + *errp = fatal; + return -1; + } + return ret; + } + + BUFFER_TRACE(bitmap_bh, "journal_release_buffer"); + ext3_journal_release_buffer(handle, bitmap_bh); + return ret; +} + +/** + * ext3_has_free_blocks() + * @sbi: in-core super block structure. + * + * Check if filesystem has at least 1 free block available for allocation. + */ +static int ext3_has_free_blocks(struct ext3_sb_info *sbi, int use_reservation) +{ + ext3_fsblk_t free_blocks, root_blocks; + + free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter); + root_blocks = le32_to_cpu(sbi->s_es->s_r_blocks_count); + if (free_blocks < root_blocks + 1 && !capable(CAP_SYS_RESOURCE) && + !use_reservation && !uid_eq(sbi->s_resuid, current_fsuid()) && + (gid_eq(sbi->s_resgid, GLOBAL_ROOT_GID) || + !in_group_p (sbi->s_resgid))) { + return 0; + } + return 1; +} + +/** + * ext3_should_retry_alloc() + * @sb: super block + * @retries number of attemps has been made + * + * ext3_should_retry_alloc() is called when ENOSPC is returned, and if + * it is profitable to retry the operation, this function will wait + * for the current or committing transaction to complete, and then + * return TRUE. + * + * if the total number of retries exceed three times, return FALSE. + */ +int ext3_should_retry_alloc(struct super_block *sb, int *retries) +{ + if (!ext3_has_free_blocks(EXT3_SB(sb), 0) || (*retries)++ > 3) + return 0; + + jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id); + + return journal_force_commit_nested(EXT3_SB(sb)->s_journal); +} + +/** + * ext3_new_blocks() -- core block(s) allocation function + * @handle: handle to this transaction + * @inode: file inode + * @goal: given target block(filesystem wide) + * @count: target number of blocks to allocate + * @errp: error code + * + * ext3_new_blocks uses a goal block to assist allocation. It tries to + * allocate block(s) from the block group contains the goal block first. If that + * fails, it will try to allocate block(s) from other block groups without + * any specific goal block. + * + */ +ext3_fsblk_t ext3_new_blocks(handle_t *handle, struct inode *inode, + ext3_fsblk_t goal, unsigned long *count, int *errp) +{ + struct buffer_head *bitmap_bh = NULL; + struct buffer_head *gdp_bh; + int group_no; + int goal_group; + ext3_grpblk_t grp_target_blk; /* blockgroup relative goal block */ + ext3_grpblk_t grp_alloc_blk; /* blockgroup-relative allocated block*/ + ext3_fsblk_t ret_block; /* filesyetem-wide allocated block */ + int bgi; /* blockgroup iteration index */ + int fatal = 0, err; + int performed_allocation = 0; + ext3_grpblk_t free_blocks; /* number of free blocks in a group */ + struct super_block *sb; + struct ext3_group_desc *gdp; + struct ext3_super_block *es; + struct ext3_sb_info *sbi; + struct ext3_reserve_window_node *my_rsv = NULL; + struct ext3_block_alloc_info *block_i; + unsigned short windowsz = 0; +#ifdef EXT3FS_DEBUG + static int goal_hits, goal_attempts; +#endif + unsigned long ngroups; + unsigned long num = *count; + + *errp = -ENOSPC; + sb = inode->i_sb; + + /* + * Check quota for allocation of this block. + */ + err = dquot_alloc_block(inode, num); + if (err) { + *errp = err; + return 0; + } + + trace_ext3_request_blocks(inode, goal, num); + + sbi = EXT3_SB(sb); + es = sbi->s_es; + ext3_debug("goal=%lu.\n", goal); + /* + * Allocate a block from reservation only when + * filesystem is mounted with reservation(default,-o reservation), and + * it's a regular file, and + * the desired window size is greater than 0 (One could use ioctl + * command EXT3_IOC_SETRSVSZ to set the window size to 0 to turn off + * reservation on that particular file) + */ + block_i = EXT3_I(inode)->i_block_alloc_info; + if (block_i && ((windowsz = block_i->rsv_window_node.rsv_goal_size) > 0)) + my_rsv = &block_i->rsv_window_node; + + if (!ext3_has_free_blocks(sbi, IS_NOQUOTA(inode))) { + *errp = -ENOSPC; + goto out; + } + + /* + * First, test whether the goal block is free. + */ + if (goal < le32_to_cpu(es->s_first_data_block) || + goal >= le32_to_cpu(es->s_blocks_count)) + goal = le32_to_cpu(es->s_first_data_block); + group_no = (goal - le32_to_cpu(es->s_first_data_block)) / + EXT3_BLOCKS_PER_GROUP(sb); + goal_group = group_no; +retry_alloc: + gdp = ext3_get_group_desc(sb, group_no, &gdp_bh); + if (!gdp) + goto io_error; + + free_blocks = le16_to_cpu(gdp->bg_free_blocks_count); + /* + * if there is not enough free blocks to make a new resevation + * turn off reservation for this allocation + */ + if (my_rsv && (free_blocks < windowsz) + && (free_blocks > 0) + && (rsv_is_empty(&my_rsv->rsv_window))) + my_rsv = NULL; + + if (free_blocks > 0) { + grp_target_blk = ((goal - le32_to_cpu(es->s_first_data_block)) % + EXT3_BLOCKS_PER_GROUP(sb)); + bitmap_bh = read_block_bitmap(sb, group_no); + if (!bitmap_bh) + goto io_error; + grp_alloc_blk = ext3_try_to_allocate_with_rsv(sb, handle, + group_no, bitmap_bh, grp_target_blk, + my_rsv, &num, &fatal); + if (fatal) + goto out; + if (grp_alloc_blk >= 0) + goto allocated; + } + + ngroups = EXT3_SB(sb)->s_groups_count; + smp_rmb(); + + /* + * Now search the rest of the groups. We assume that + * group_no and gdp correctly point to the last group visited. + */ + for (bgi = 0; bgi < ngroups; bgi++) { + group_no++; + if (group_no >= ngroups) + group_no = 0; + gdp = ext3_get_group_desc(sb, group_no, &gdp_bh); + if (!gdp) + goto io_error; + free_blocks = le16_to_cpu(gdp->bg_free_blocks_count); + /* + * skip this group (and avoid loading bitmap) if there + * are no free blocks + */ + if (!free_blocks) + continue; + /* + * skip this group if the number of + * free blocks is less than half of the reservation + * window size. + */ + if (my_rsv && (free_blocks <= (windowsz/2))) + continue; + + brelse(bitmap_bh); + bitmap_bh = read_block_bitmap(sb, group_no); + if (!bitmap_bh) + goto io_error; + /* + * try to allocate block(s) from this group, without a goal(-1). + */ + grp_alloc_blk = ext3_try_to_allocate_with_rsv(sb, handle, + group_no, bitmap_bh, -1, my_rsv, + &num, &fatal); + if (fatal) + goto out; + if (grp_alloc_blk >= 0) + goto allocated; + } + /* + * We may end up a bogus earlier ENOSPC error due to + * filesystem is "full" of reservations, but + * there maybe indeed free blocks available on disk + * In this case, we just forget about the reservations + * just do block allocation as without reservations. + */ + if (my_rsv) { + my_rsv = NULL; + windowsz = 0; + group_no = goal_group; + goto retry_alloc; + } + /* No space left on the device */ + *errp = -ENOSPC; + goto out; + +allocated: + + ext3_debug("using block group %d(%d)\n", + group_no, gdp->bg_free_blocks_count); + + BUFFER_TRACE(gdp_bh, "get_write_access"); + fatal = ext3_journal_get_write_access(handle, gdp_bh); + if (fatal) + goto out; + + ret_block = grp_alloc_blk + ext3_group_first_block_no(sb, group_no); + + if (in_range(le32_to_cpu(gdp->bg_block_bitmap), ret_block, num) || + in_range(le32_to_cpu(gdp->bg_inode_bitmap), ret_block, num) || + in_range(ret_block, le32_to_cpu(gdp->bg_inode_table), + EXT3_SB(sb)->s_itb_per_group) || + in_range(ret_block + num - 1, le32_to_cpu(gdp->bg_inode_table), + EXT3_SB(sb)->s_itb_per_group)) { + ext3_error(sb, "ext3_new_block", + "Allocating block in system zone - " + "blocks from "E3FSBLK", length %lu", + ret_block, num); + /* + * claim_block() marked the blocks we allocated as in use. So we + * may want to selectively mark some of the blocks as free. + */ + goto retry_alloc; + } + + performed_allocation = 1; + +#ifdef CONFIG_JBD_DEBUG + { + struct buffer_head *debug_bh; + + /* Record bitmap buffer state in the newly allocated block */ + debug_bh = sb_find_get_block(sb, ret_block); + if (debug_bh) { + BUFFER_TRACE(debug_bh, "state when allocated"); + BUFFER_TRACE2(debug_bh, bitmap_bh, "bitmap state"); + brelse(debug_bh); + } + } + jbd_lock_bh_state(bitmap_bh); + spin_lock(sb_bgl_lock(sbi, group_no)); + if (buffer_jbd(bitmap_bh) && bh2jh(bitmap_bh)->b_committed_data) { + int i; + + for (i = 0; i < num; i++) { + if (ext3_test_bit(grp_alloc_blk+i, + bh2jh(bitmap_bh)->b_committed_data)) { + printk("%s: block was unexpectedly set in " + "b_committed_data\n", __func__); + } + } + } + ext3_debug("found bit %d\n", grp_alloc_blk); + spin_unlock(sb_bgl_lock(sbi, group_no)); + jbd_unlock_bh_state(bitmap_bh); +#endif + + if (ret_block + num - 1 >= le32_to_cpu(es->s_blocks_count)) { + ext3_error(sb, "ext3_new_block", + "block("E3FSBLK") >= blocks count(%d) - " + "block_group = %d, es == %p ", ret_block, + le32_to_cpu(es->s_blocks_count), group_no, es); + goto out; + } + + /* + * It is up to the caller to add the new buffer to a journal + * list of some description. We don't know in advance whether + * the caller wants to use it as metadata or data. + */ + ext3_debug("allocating block %lu. Goal hits %d of %d.\n", + ret_block, goal_hits, goal_attempts); + + spin_lock(sb_bgl_lock(sbi, group_no)); + le16_add_cpu(&gdp->bg_free_blocks_count, -num); + spin_unlock(sb_bgl_lock(sbi, group_no)); + percpu_counter_sub(&sbi->s_freeblocks_counter, num); + + BUFFER_TRACE(gdp_bh, "journal_dirty_metadata for group descriptor"); + fatal = ext3_journal_dirty_metadata(handle, gdp_bh); + if (fatal) + goto out; + + *errp = 0; + brelse(bitmap_bh); + + if (num < *count) { + dquot_free_block(inode, *count-num); + *count = num; + } + + trace_ext3_allocate_blocks(inode, goal, num, + (unsigned long long)ret_block); + + return ret_block; + +io_error: + *errp = -EIO; +out: + if (fatal) { + *errp = fatal; + ext3_std_error(sb, fatal); + } + /* + * Undo the block allocation + */ + if (!performed_allocation) + dquot_free_block(inode, *count); + brelse(bitmap_bh); + return 0; +} + +ext3_fsblk_t ext3_new_block(handle_t *handle, struct inode *inode, + ext3_fsblk_t goal, int *errp) +{ + unsigned long count = 1; + + return ext3_new_blocks(handle, inode, goal, &count, errp); +} + +/** + * ext3_count_free_blocks() -- count filesystem free blocks + * @sb: superblock + * + * Adds up the number of free blocks from each block group. + */ +ext3_fsblk_t ext3_count_free_blocks(struct super_block *sb) +{ + ext3_fsblk_t desc_count; + struct ext3_group_desc *gdp; + int i; + unsigned long ngroups = EXT3_SB(sb)->s_groups_count; +#ifdef EXT3FS_DEBUG + struct ext3_super_block *es; + ext3_fsblk_t bitmap_count; + unsigned long x; + struct buffer_head *bitmap_bh = NULL; + + es = EXT3_SB(sb)->s_es; + desc_count = 0; + bitmap_count = 0; + gdp = NULL; + + smp_rmb(); + for (i = 0; i < ngroups; i++) { + gdp = ext3_get_group_desc(sb, i, NULL); + if (!gdp) + continue; + desc_count += le16_to_cpu(gdp->bg_free_blocks_count); + brelse(bitmap_bh); + bitmap_bh = read_block_bitmap(sb, i); + if (bitmap_bh == NULL) + continue; + + x = ext3_count_free(bitmap_bh, sb->s_blocksize); + printk("group %d: stored = %d, counted = %lu\n", + i, le16_to_cpu(gdp->bg_free_blocks_count), x); + bitmap_count += x; + } + brelse(bitmap_bh); + printk("ext3_count_free_blocks: stored = "E3FSBLK + ", computed = "E3FSBLK", "E3FSBLK"\n", + (ext3_fsblk_t)le32_to_cpu(es->s_free_blocks_count), + desc_count, bitmap_count); + return bitmap_count; +#else + desc_count = 0; + smp_rmb(); + for (i = 0; i < ngroups; i++) { + gdp = ext3_get_group_desc(sb, i, NULL); + if (!gdp) + continue; + desc_count += le16_to_cpu(gdp->bg_free_blocks_count); + } + + return desc_count; +#endif +} + +static inline int test_root(int a, int b) +{ + int num = b; + + while (a > num) + num *= b; + return num == a; +} + +static int ext3_group_sparse(int group) +{ + if (group <= 1) + return 1; + if (!(group & 1)) + return 0; + return (test_root(group, 7) || test_root(group, 5) || + test_root(group, 3)); +} + +/** + * ext3_bg_has_super - number of blocks used by the superblock in group + * @sb: superblock for filesystem + * @group: group number to check + * + * Return the number of blocks used by the superblock (primary or backup) + * in this group. Currently this will be only 0 or 1. + */ +int ext3_bg_has_super(struct super_block *sb, int group) +{ + if (EXT3_HAS_RO_COMPAT_FEATURE(sb, + EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER) && + !ext3_group_sparse(group)) + return 0; + return 1; +} + +static unsigned long ext3_bg_num_gdb_meta(struct super_block *sb, int group) +{ + unsigned long metagroup = group / EXT3_DESC_PER_BLOCK(sb); + unsigned long first = metagroup * EXT3_DESC_PER_BLOCK(sb); + unsigned long last = first + EXT3_DESC_PER_BLOCK(sb) - 1; + + if (group == first || group == first + 1 || group == last) + return 1; + return 0; +} + +static unsigned long ext3_bg_num_gdb_nometa(struct super_block *sb, int group) +{ + return ext3_bg_has_super(sb, group) ? EXT3_SB(sb)->s_gdb_count : 0; +} + +/** + * ext3_bg_num_gdb - number of blocks used by the group table in group + * @sb: superblock for filesystem + * @group: group number to check + * + * Return the number of blocks used by the group descriptor table + * (primary or backup) in this group. In the future there may be a + * different number of descriptor blocks in each group. + */ +unsigned long ext3_bg_num_gdb(struct super_block *sb, int group) +{ + unsigned long first_meta_bg = + le32_to_cpu(EXT3_SB(sb)->s_es->s_first_meta_bg); + unsigned long metagroup = group / EXT3_DESC_PER_BLOCK(sb); + + if (!EXT3_HAS_INCOMPAT_FEATURE(sb,EXT3_FEATURE_INCOMPAT_META_BG) || + metagroup < first_meta_bg) + return ext3_bg_num_gdb_nometa(sb,group); + + return ext3_bg_num_gdb_meta(sb,group); + +} + +/** + * ext3_trim_all_free -- function to trim all free space in alloc. group + * @sb: super block for file system + * @group: allocation group to trim + * @start: first group block to examine + * @max: last group block to examine + * @gdp: allocation group description structure + * @minblocks: minimum extent block count + * + * ext3_trim_all_free walks through group's block bitmap searching for free + * blocks. When the free block is found, it tries to allocate this block and + * consequent free block to get the biggest free extent possible, until it + * reaches any used block. Then issue a TRIM command on this extent and free + * the extent in the block bitmap. This is done until whole group is scanned. + */ +static ext3_grpblk_t ext3_trim_all_free(struct super_block *sb, + unsigned int group, + ext3_grpblk_t start, ext3_grpblk_t max, + ext3_grpblk_t minblocks) +{ + handle_t *handle; + ext3_grpblk_t next, free_blocks, bit, freed, count = 0; + ext3_fsblk_t discard_block; + struct ext3_sb_info *sbi; + struct buffer_head *gdp_bh, *bitmap_bh = NULL; + struct ext3_group_desc *gdp; + int err = 0, ret = 0; + + /* + * We will update one block bitmap, and one group descriptor + */ + handle = ext3_journal_start_sb(sb, 2); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + bitmap_bh = read_block_bitmap(sb, group); + if (!bitmap_bh) { + err = -EIO; + goto err_out; + } + + BUFFER_TRACE(bitmap_bh, "getting undo access"); + err = ext3_journal_get_undo_access(handle, bitmap_bh); + if (err) + goto err_out; + + gdp = ext3_get_group_desc(sb, group, &gdp_bh); + if (!gdp) { + err = -EIO; + goto err_out; + } + + BUFFER_TRACE(gdp_bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, gdp_bh); + if (err) + goto err_out; + + free_blocks = le16_to_cpu(gdp->bg_free_blocks_count); + sbi = EXT3_SB(sb); + + /* Walk through the whole group */ + while (start <= max) { + start = bitmap_search_next_usable_block(start, bitmap_bh, max); + if (start < 0) + break; + next = start; + + /* + * Allocate contiguous free extents by setting bits in the + * block bitmap + */ + while (next <= max + && claim_block(sb_bgl_lock(sbi, group), + next, bitmap_bh)) { + next++; + } + + /* We did not claim any blocks */ + if (next == start) + continue; + + discard_block = (ext3_fsblk_t)start + + ext3_group_first_block_no(sb, group); + + /* Update counters */ + spin_lock(sb_bgl_lock(sbi, group)); + le16_add_cpu(&gdp->bg_free_blocks_count, start - next); + spin_unlock(sb_bgl_lock(sbi, group)); + percpu_counter_sub(&sbi->s_freeblocks_counter, next - start); + + free_blocks -= next - start; + /* Do not issue a TRIM on extents smaller than minblocks */ + if ((next - start) < minblocks) + goto free_extent; + + trace_ext3_discard_blocks(sb, discard_block, next - start); + /* Send the TRIM command down to the device */ + err = sb_issue_discard(sb, discard_block, next - start, + GFP_NOFS, 0); + count += (next - start); +free_extent: + freed = 0; + + /* + * Clear bits in the bitmap + */ + for (bit = start; bit < next; bit++) { + BUFFER_TRACE(bitmap_bh, "clear bit"); + if (!ext3_clear_bit_atomic(sb_bgl_lock(sbi, group), + bit, bitmap_bh->b_data)) { + ext3_error(sb, __func__, + "bit already cleared for block "E3FSBLK, + (unsigned long)bit); + BUFFER_TRACE(bitmap_bh, "bit already cleared"); + } else { + freed++; + } + } + + /* Update couters */ + spin_lock(sb_bgl_lock(sbi, group)); + le16_add_cpu(&gdp->bg_free_blocks_count, freed); + spin_unlock(sb_bgl_lock(sbi, group)); + percpu_counter_add(&sbi->s_freeblocks_counter, freed); + + start = next; + if (err < 0) { + if (err != -EOPNOTSUPP) + ext3_warning(sb, __func__, "Discard command " + "returned error %d\n", err); + break; + } + + if (fatal_signal_pending(current)) { + err = -ERESTARTSYS; + break; + } + + cond_resched(); + + /* No more suitable extents */ + if (free_blocks < minblocks) + break; + } + + /* We dirtied the bitmap block */ + BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); + ret = ext3_journal_dirty_metadata(handle, bitmap_bh); + if (!err) + err = ret; + + /* And the group descriptor block */ + BUFFER_TRACE(gdp_bh, "dirtied group descriptor block"); + ret = ext3_journal_dirty_metadata(handle, gdp_bh); + if (!err) + err = ret; + + ext3_debug("trimmed %d blocks in the group %d\n", + count, group); + +err_out: + if (err) + count = err; + ext3_journal_stop(handle); + brelse(bitmap_bh); + + return count; +} + +/** + * ext3_trim_fs() -- trim ioctl handle function + * @sb: superblock for filesystem + * @start: First Byte to trim + * @len: number of Bytes to trim from start + * @minlen: minimum extent length in Bytes + * + * ext3_trim_fs goes through all allocation groups containing Bytes from + * start to start+len. For each such a group ext3_trim_all_free function + * is invoked to trim all free space. + */ +int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range) +{ + ext3_grpblk_t last_block, first_block; + unsigned long group, first_group, last_group; + struct ext3_group_desc *gdp; + struct ext3_super_block *es = EXT3_SB(sb)->s_es; + uint64_t start, minlen, end, trimmed = 0; + ext3_fsblk_t first_data_blk = + le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block); + ext3_fsblk_t max_blks = le32_to_cpu(es->s_blocks_count); + int ret = 0; + + start = range->start >> sb->s_blocksize_bits; + end = start + (range->len >> sb->s_blocksize_bits) - 1; + minlen = range->minlen >> sb->s_blocksize_bits; + + if (minlen > EXT3_BLOCKS_PER_GROUP(sb) || + start >= max_blks || + range->len < sb->s_blocksize) + return -EINVAL; + if (end >= max_blks) + end = max_blks - 1; + if (end <= first_data_blk) + goto out; + if (start < first_data_blk) + start = first_data_blk; + + smp_rmb(); + + /* Determine first and last group to examine based on start and len */ + ext3_get_group_no_and_offset(sb, (ext3_fsblk_t) start, + &first_group, &first_block); + ext3_get_group_no_and_offset(sb, (ext3_fsblk_t) end, + &last_group, &last_block); + + /* end now represents the last block to discard in this group */ + end = EXT3_BLOCKS_PER_GROUP(sb) - 1; + + for (group = first_group; group <= last_group; group++) { + gdp = ext3_get_group_desc(sb, group, NULL); + if (!gdp) + break; + + /* + * For all the groups except the last one, last block will + * always be EXT3_BLOCKS_PER_GROUP(sb)-1, so we only need to + * change it for the last group, note that last_block is + * already computed earlier by ext3_get_group_no_and_offset() + */ + if (group == last_group) + end = last_block; + + if (le16_to_cpu(gdp->bg_free_blocks_count) >= minlen) { + ret = ext3_trim_all_free(sb, group, first_block, + end, minlen); + if (ret < 0) + break; + trimmed += ret; + } + + /* + * For every group except the first one, we are sure + * that the first block to discard will be block #0. + */ + first_block = 0; + } + + if (ret > 0) + ret = 0; + +out: + range->len = trimmed * sb->s_blocksize; + return ret; +} diff --git a/kernel/fs/ext3/bitmap.c b/kernel/fs/ext3/bitmap.c new file mode 100644 index 000000000..ef9c643e8 --- /dev/null +++ b/kernel/fs/ext3/bitmap.c @@ -0,0 +1,20 @@ +/* + * linux/fs/ext3/bitmap.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + */ + +#include "ext3.h" + +#ifdef EXT3FS_DEBUG + +unsigned long ext3_count_free (struct buffer_head * map, unsigned int numchars) +{ + return numchars * BITS_PER_BYTE - memweight(map->b_data, numchars); +} + +#endif /* EXT3FS_DEBUG */ + diff --git a/kernel/fs/ext3/dir.c b/kernel/fs/ext3/dir.c new file mode 100644 index 000000000..17742eed2 --- /dev/null +++ b/kernel/fs/ext3/dir.c @@ -0,0 +1,537 @@ +/* + * linux/fs/ext3/dir.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/dir.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * ext3 directory handling functions + * + * Big-endian to little-endian byte-swapping/bitmaps by + * David S. Miller (davem@caip.rutgers.edu), 1995 + * + * Hash Tree Directory indexing (c) 2001 Daniel Phillips + * + */ + +#include +#include "ext3.h" + +static unsigned char ext3_filetype_table[] = { + DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK +}; + +static int ext3_dx_readdir(struct file *, struct dir_context *); + +static unsigned char get_dtype(struct super_block *sb, int filetype) +{ + if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_FILETYPE) || + (filetype >= EXT3_FT_MAX)) + return DT_UNKNOWN; + + return (ext3_filetype_table[filetype]); +} + +/** + * Check if the given dir-inode refers to an htree-indexed directory + * (or a directory which could potentially get converted to use htree + * indexing). + * + * Return 1 if it is a dx dir, 0 if not + */ +static int is_dx_dir(struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + + if (EXT3_HAS_COMPAT_FEATURE(inode->i_sb, + EXT3_FEATURE_COMPAT_DIR_INDEX) && + ((EXT3_I(inode)->i_flags & EXT3_INDEX_FL) || + ((inode->i_size >> sb->s_blocksize_bits) == 1))) + return 1; + + return 0; +} + +int ext3_check_dir_entry (const char * function, struct inode * dir, + struct ext3_dir_entry_2 * de, + struct buffer_head * bh, + unsigned long offset) +{ + const char * error_msg = NULL; + const int rlen = ext3_rec_len_from_disk(de->rec_len); + + if (unlikely(rlen < EXT3_DIR_REC_LEN(1))) + error_msg = "rec_len is smaller than minimal"; + else if (unlikely(rlen % 4 != 0)) + error_msg = "rec_len % 4 != 0"; + else if (unlikely(rlen < EXT3_DIR_REC_LEN(de->name_len))) + error_msg = "rec_len is too small for name_len"; + else if (unlikely((((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize))) + error_msg = "directory entry across blocks"; + else if (unlikely(le32_to_cpu(de->inode) > + le32_to_cpu(EXT3_SB(dir->i_sb)->s_es->s_inodes_count))) + error_msg = "inode out of bounds"; + + if (unlikely(error_msg != NULL)) + ext3_error (dir->i_sb, function, + "bad entry in directory #%lu: %s - " + "offset=%lu, inode=%lu, rec_len=%d, name_len=%d", + dir->i_ino, error_msg, offset, + (unsigned long) le32_to_cpu(de->inode), + rlen, de->name_len); + + return error_msg == NULL ? 1 : 0; +} + +static int ext3_readdir(struct file *file, struct dir_context *ctx) +{ + unsigned long offset; + int i; + struct ext3_dir_entry_2 *de; + int err; + struct inode *inode = file_inode(file); + struct super_block *sb = inode->i_sb; + int dir_has_error = 0; + + if (is_dx_dir(inode)) { + err = ext3_dx_readdir(file, ctx); + if (err != ERR_BAD_DX_DIR) + return err; + /* + * We don't set the inode dirty flag since it's not + * critical that it get flushed back to the disk. + */ + EXT3_I(inode)->i_flags &= ~EXT3_INDEX_FL; + } + offset = ctx->pos & (sb->s_blocksize - 1); + + while (ctx->pos < inode->i_size) { + unsigned long blk = ctx->pos >> EXT3_BLOCK_SIZE_BITS(sb); + struct buffer_head map_bh; + struct buffer_head *bh = NULL; + + map_bh.b_state = 0; + err = ext3_get_blocks_handle(NULL, inode, blk, 1, &map_bh, 0); + if (err > 0) { + pgoff_t index = map_bh.b_blocknr >> + (PAGE_CACHE_SHIFT - inode->i_blkbits); + if (!ra_has_index(&file->f_ra, index)) + page_cache_sync_readahead( + sb->s_bdev->bd_inode->i_mapping, + &file->f_ra, file, + index, 1); + file->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT; + bh = ext3_bread(NULL, inode, blk, 0, &err); + } + + /* + * We ignore I/O errors on directories so users have a chance + * of recovering data when there's a bad sector + */ + if (!bh) { + if (!dir_has_error) { + ext3_error(sb, __func__, "directory #%lu " + "contains a hole at offset %lld", + inode->i_ino, ctx->pos); + dir_has_error = 1; + } + /* corrupt size? Maybe no more blocks to read */ + if (ctx->pos > inode->i_blocks << 9) + break; + ctx->pos += sb->s_blocksize - offset; + continue; + } + + /* If the dir block has changed since the last call to + * readdir(2), then we might be pointing to an invalid + * dirent right now. Scan from the start of the block + * to make sure. */ + if (offset && file->f_version != inode->i_version) { + for (i = 0; i < sb->s_blocksize && i < offset; ) { + de = (struct ext3_dir_entry_2 *) + (bh->b_data + i); + /* It's too expensive to do a full + * dirent test each time round this + * loop, but we do have to test at + * least that it is non-zero. A + * failure will be detected in the + * dirent test below. */ + if (ext3_rec_len_from_disk(de->rec_len) < + EXT3_DIR_REC_LEN(1)) + break; + i += ext3_rec_len_from_disk(de->rec_len); + } + offset = i; + ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1)) + | offset; + file->f_version = inode->i_version; + } + + while (ctx->pos < inode->i_size + && offset < sb->s_blocksize) { + de = (struct ext3_dir_entry_2 *) (bh->b_data + offset); + if (!ext3_check_dir_entry ("ext3_readdir", inode, de, + bh, offset)) { + /* On error, skip the to the + next block. */ + ctx->pos = (ctx->pos | + (sb->s_blocksize - 1)) + 1; + break; + } + offset += ext3_rec_len_from_disk(de->rec_len); + if (le32_to_cpu(de->inode)) { + if (!dir_emit(ctx, de->name, de->name_len, + le32_to_cpu(de->inode), + get_dtype(sb, de->file_type))) { + brelse(bh); + return 0; + } + } + ctx->pos += ext3_rec_len_from_disk(de->rec_len); + } + offset = 0; + brelse (bh); + if (ctx->pos < inode->i_size) + if (!dir_relax(inode)) + return 0; + } + return 0; +} + +static inline int is_32bit_api(void) +{ +#ifdef CONFIG_COMPAT + return is_compat_task(); +#else + return (BITS_PER_LONG == 32); +#endif +} + +/* + * These functions convert from the major/minor hash to an f_pos + * value for dx directories + * + * Upper layer (for example NFS) should specify FMODE_32BITHASH or + * FMODE_64BITHASH explicitly. On the other hand, we allow ext3 to be mounted + * directly on both 32-bit and 64-bit nodes, under such case, neither + * FMODE_32BITHASH nor FMODE_64BITHASH is specified. + */ +static inline loff_t hash2pos(struct file *filp, __u32 major, __u32 minor) +{ + if ((filp->f_mode & FMODE_32BITHASH) || + (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) + return major >> 1; + else + return ((__u64)(major >> 1) << 32) | (__u64)minor; +} + +static inline __u32 pos2maj_hash(struct file *filp, loff_t pos) +{ + if ((filp->f_mode & FMODE_32BITHASH) || + (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) + return (pos << 1) & 0xffffffff; + else + return ((pos >> 32) << 1) & 0xffffffff; +} + +static inline __u32 pos2min_hash(struct file *filp, loff_t pos) +{ + if ((filp->f_mode & FMODE_32BITHASH) || + (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) + return 0; + else + return pos & 0xffffffff; +} + +/* + * Return 32- or 64-bit end-of-file for dx directories + */ +static inline loff_t ext3_get_htree_eof(struct file *filp) +{ + if ((filp->f_mode & FMODE_32BITHASH) || + (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) + return EXT3_HTREE_EOF_32BIT; + else + return EXT3_HTREE_EOF_64BIT; +} + + +/* + * ext3_dir_llseek() calls generic_file_llseek[_size]() to handle both + * non-htree and htree directories, where the "offset" is in terms + * of the filename hash value instead of the byte offset. + * + * Because we may return a 64-bit hash that is well beyond s_maxbytes, + * we need to pass the max hash as the maximum allowable offset in + * the htree directory case. + * + * NOTE: offsets obtained *before* ext3_set_inode_flag(dir, EXT3_INODE_INDEX) + * will be invalid once the directory was converted into a dx directory + */ +static loff_t ext3_dir_llseek(struct file *file, loff_t offset, int whence) +{ + struct inode *inode = file->f_mapping->host; + int dx_dir = is_dx_dir(inode); + loff_t htree_max = ext3_get_htree_eof(file); + + if (likely(dx_dir)) + return generic_file_llseek_size(file, offset, whence, + htree_max, htree_max); + else + return generic_file_llseek(file, offset, whence); +} + +/* + * This structure holds the nodes of the red-black tree used to store + * the directory entry in hash order. + */ +struct fname { + __u32 hash; + __u32 minor_hash; + struct rb_node rb_hash; + struct fname *next; + __u32 inode; + __u8 name_len; + __u8 file_type; + char name[0]; +}; + +/* + * This functoin implements a non-recursive way of freeing all of the + * nodes in the red-black tree. + */ +static void free_rb_tree_fname(struct rb_root *root) +{ + struct fname *fname, *next; + + rbtree_postorder_for_each_entry_safe(fname, next, root, rb_hash) + do { + struct fname *old = fname; + fname = fname->next; + kfree(old); + } while (fname); + + *root = RB_ROOT; +} + +static struct dir_private_info *ext3_htree_create_dir_info(struct file *filp, + loff_t pos) +{ + struct dir_private_info *p; + + p = kzalloc(sizeof(struct dir_private_info), GFP_KERNEL); + if (!p) + return NULL; + p->curr_hash = pos2maj_hash(filp, pos); + p->curr_minor_hash = pos2min_hash(filp, pos); + return p; +} + +void ext3_htree_free_dir_info(struct dir_private_info *p) +{ + free_rb_tree_fname(&p->root); + kfree(p); +} + +/* + * Given a directory entry, enter it into the fname rb tree. + */ +int ext3_htree_store_dirent(struct file *dir_file, __u32 hash, + __u32 minor_hash, + struct ext3_dir_entry_2 *dirent) +{ + struct rb_node **p, *parent = NULL; + struct fname * fname, *new_fn; + struct dir_private_info *info; + int len; + + info = (struct dir_private_info *) dir_file->private_data; + p = &info->root.rb_node; + + /* Create and allocate the fname structure */ + len = sizeof(struct fname) + dirent->name_len + 1; + new_fn = kzalloc(len, GFP_KERNEL); + if (!new_fn) + return -ENOMEM; + new_fn->hash = hash; + new_fn->minor_hash = minor_hash; + new_fn->inode = le32_to_cpu(dirent->inode); + new_fn->name_len = dirent->name_len; + new_fn->file_type = dirent->file_type; + memcpy(new_fn->name, dirent->name, dirent->name_len); + new_fn->name[dirent->name_len] = 0; + + while (*p) { + parent = *p; + fname = rb_entry(parent, struct fname, rb_hash); + + /* + * If the hash and minor hash match up, then we put + * them on a linked list. This rarely happens... + */ + if ((new_fn->hash == fname->hash) && + (new_fn->minor_hash == fname->minor_hash)) { + new_fn->next = fname->next; + fname->next = new_fn; + return 0; + } + + if (new_fn->hash < fname->hash) + p = &(*p)->rb_left; + else if (new_fn->hash > fname->hash) + p = &(*p)->rb_right; + else if (new_fn->minor_hash < fname->minor_hash) + p = &(*p)->rb_left; + else /* if (new_fn->minor_hash > fname->minor_hash) */ + p = &(*p)->rb_right; + } + + rb_link_node(&new_fn->rb_hash, parent, p); + rb_insert_color(&new_fn->rb_hash, &info->root); + return 0; +} + + + +/* + * This is a helper function for ext3_dx_readdir. It calls filldir + * for all entres on the fname linked list. (Normally there is only + * one entry on the linked list, unless there are 62 bit hash collisions.) + */ +static bool call_filldir(struct file *file, struct dir_context *ctx, + struct fname *fname) +{ + struct dir_private_info *info = file->private_data; + struct inode *inode = file_inode(file); + struct super_block *sb = inode->i_sb; + + if (!fname) { + printk("call_filldir: called with null fname?!?\n"); + return true; + } + ctx->pos = hash2pos(file, fname->hash, fname->minor_hash); + while (fname) { + if (!dir_emit(ctx, fname->name, fname->name_len, + fname->inode, + get_dtype(sb, fname->file_type))) { + info->extra_fname = fname; + return false; + } + fname = fname->next; + } + return true; +} + +static int ext3_dx_readdir(struct file *file, struct dir_context *ctx) +{ + struct dir_private_info *info = file->private_data; + struct inode *inode = file_inode(file); + struct fname *fname; + int ret; + + if (!info) { + info = ext3_htree_create_dir_info(file, ctx->pos); + if (!info) + return -ENOMEM; + file->private_data = info; + } + + if (ctx->pos == ext3_get_htree_eof(file)) + return 0; /* EOF */ + + /* Some one has messed with f_pos; reset the world */ + if (info->last_pos != ctx->pos) { + free_rb_tree_fname(&info->root); + info->curr_node = NULL; + info->extra_fname = NULL; + info->curr_hash = pos2maj_hash(file, ctx->pos); + info->curr_minor_hash = pos2min_hash(file, ctx->pos); + } + + /* + * If there are any leftover names on the hash collision + * chain, return them first. + */ + if (info->extra_fname) { + if (!call_filldir(file, ctx, info->extra_fname)) + goto finished; + info->extra_fname = NULL; + goto next_node; + } else if (!info->curr_node) + info->curr_node = rb_first(&info->root); + + while (1) { + /* + * Fill the rbtree if we have no more entries, + * or the inode has changed since we last read in the + * cached entries. + */ + if ((!info->curr_node) || + (file->f_version != inode->i_version)) { + info->curr_node = NULL; + free_rb_tree_fname(&info->root); + file->f_version = inode->i_version; + ret = ext3_htree_fill_tree(file, info->curr_hash, + info->curr_minor_hash, + &info->next_hash); + if (ret < 0) + return ret; + if (ret == 0) { + ctx->pos = ext3_get_htree_eof(file); + break; + } + info->curr_node = rb_first(&info->root); + } + + fname = rb_entry(info->curr_node, struct fname, rb_hash); + info->curr_hash = fname->hash; + info->curr_minor_hash = fname->minor_hash; + if (!call_filldir(file, ctx, fname)) + break; + next_node: + info->curr_node = rb_next(info->curr_node); + if (info->curr_node) { + fname = rb_entry(info->curr_node, struct fname, + rb_hash); + info->curr_hash = fname->hash; + info->curr_minor_hash = fname->minor_hash; + } else { + if (info->next_hash == ~0) { + ctx->pos = ext3_get_htree_eof(file); + break; + } + info->curr_hash = info->next_hash; + info->curr_minor_hash = 0; + } + } +finished: + info->last_pos = ctx->pos; + return 0; +} + +static int ext3_release_dir (struct inode * inode, struct file * filp) +{ + if (filp->private_data) + ext3_htree_free_dir_info(filp->private_data); + + return 0; +} + +const struct file_operations ext3_dir_operations = { + .llseek = ext3_dir_llseek, + .read = generic_read_dir, + .iterate = ext3_readdir, + .unlocked_ioctl = ext3_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = ext3_compat_ioctl, +#endif + .fsync = ext3_sync_file, + .release = ext3_release_dir, +}; diff --git a/kernel/fs/ext3/ext3.h b/kernel/fs/ext3/ext3.h new file mode 100644 index 000000000..f483a80b3 --- /dev/null +++ b/kernel/fs/ext3/ext3.h @@ -0,0 +1,1332 @@ +/* + * Written by Stephen C. Tweedie , 1999 + * + * Copyright 1998--1999 Red Hat corp --- All Rights Reserved + * + * This file is part of the Linux kernel and is made available under + * the terms of the GNU General Public License, version 2, or at your + * option, any later version, incorporated herein by reference. + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/include/linux/minix_fs.h + * + * Copyright (C) 1991, 1992 Linus Torvalds + */ + +#include +#include +#include +#include +#include + +/* + * The second extended filesystem constants/structures + */ + +/* + * Define EXT3FS_DEBUG to produce debug messages + */ +#undef EXT3FS_DEBUG + +/* + * Define EXT3_RESERVATION to reserve data blocks for expanding files + */ +#define EXT3_DEFAULT_RESERVE_BLOCKS 8 +/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ +#define EXT3_MAX_RESERVE_BLOCKS 1027 +#define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0 + +/* + * Debug code + */ +#ifdef EXT3FS_DEBUG +#define ext3_debug(f, a...) \ + do { \ + printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \ + __FILE__, __LINE__, __func__); \ + printk (KERN_DEBUG f, ## a); \ + } while (0) +#else +#define ext3_debug(f, a...) do {} while (0) +#endif + +/* + * Special inodes numbers + */ +#define EXT3_BAD_INO 1 /* Bad blocks inode */ +#define EXT3_ROOT_INO 2 /* Root inode */ +#define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */ +#define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */ +#define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */ +#define EXT3_JOURNAL_INO 8 /* Journal inode */ + +/* First non-reserved inode for old ext3 filesystems */ +#define EXT3_GOOD_OLD_FIRST_INO 11 + +/* + * Maximal count of links to a file + */ +#define EXT3_LINK_MAX 32000 + +/* + * Macro-instructions used to manage several block sizes + */ +#define EXT3_MIN_BLOCK_SIZE 1024 +#define EXT3_MAX_BLOCK_SIZE 65536 +#define EXT3_MIN_BLOCK_LOG_SIZE 10 +#define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize) +#define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32)) +#define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) +#define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits) +#define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size) +#define EXT3_FIRST_INO(s) (EXT3_SB(s)->s_first_ino) + +/* + * Macro-instructions used to manage fragments + */ +#define EXT3_MIN_FRAG_SIZE 1024 +#define EXT3_MAX_FRAG_SIZE 4096 +#define EXT3_MIN_FRAG_LOG_SIZE 10 +#define EXT3_FRAG_SIZE(s) (EXT3_SB(s)->s_frag_size) +#define EXT3_FRAGS_PER_BLOCK(s) (EXT3_SB(s)->s_frags_per_block) + +/* + * Structure of a blocks group descriptor + */ +struct ext3_group_desc +{ + __le32 bg_block_bitmap; /* Blocks bitmap block */ + __le32 bg_inode_bitmap; /* Inodes bitmap block */ + __le32 bg_inode_table; /* Inodes table block */ + __le16 bg_free_blocks_count; /* Free blocks count */ + __le16 bg_free_inodes_count; /* Free inodes count */ + __le16 bg_used_dirs_count; /* Directories count */ + __u16 bg_pad; + __le32 bg_reserved[3]; +}; + +/* + * Macro-instructions used to manage group descriptors + */ +#define EXT3_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group) +#define EXT3_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block) +#define EXT3_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group) +#define EXT3_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits) + +/* + * Constants relative to the data blocks + */ +#define EXT3_NDIR_BLOCKS 12 +#define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS +#define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1) +#define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1) +#define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1) + +/* + * Inode flags + */ +#define EXT3_SECRM_FL 0x00000001 /* Secure deletion */ +#define EXT3_UNRM_FL 0x00000002 /* Undelete */ +#define EXT3_COMPR_FL 0x00000004 /* Compress file */ +#define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */ +#define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */ +#define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */ +#define EXT3_NODUMP_FL 0x00000040 /* do not dump file */ +#define EXT3_NOATIME_FL 0x00000080 /* do not update atime */ +/* Reserved for compression usage... */ +#define EXT3_DIRTY_FL 0x00000100 +#define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ +#define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */ +#define EXT3_ECOMPR_FL 0x00000800 /* Compression error */ +/* End compression flags --- maybe not all used */ +#define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */ +#define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */ +#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ +#define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */ +#define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ +#define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ +#define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */ + +#define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ +#define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ + +/* Flags that should be inherited by new inodes from their parent. */ +#define EXT3_FL_INHERITED (EXT3_SECRM_FL | EXT3_UNRM_FL | EXT3_COMPR_FL |\ + EXT3_SYNC_FL | EXT3_NODUMP_FL |\ + EXT3_NOATIME_FL | EXT3_COMPRBLK_FL |\ + EXT3_NOCOMPR_FL | EXT3_JOURNAL_DATA_FL |\ + EXT3_NOTAIL_FL | EXT3_DIRSYNC_FL) + +/* Flags that are appropriate for regular files (all but dir-specific ones). */ +#define EXT3_REG_FLMASK (~(EXT3_DIRSYNC_FL | EXT3_TOPDIR_FL)) + +/* Flags that are appropriate for non-directories/regular files. */ +#define EXT3_OTHER_FLMASK (EXT3_NODUMP_FL | EXT3_NOATIME_FL) + +/* Mask out flags that are inappropriate for the given type of inode. */ +static inline __u32 ext3_mask_flags(umode_t mode, __u32 flags) +{ + if (S_ISDIR(mode)) + return flags; + else if (S_ISREG(mode)) + return flags & EXT3_REG_FLMASK; + else + return flags & EXT3_OTHER_FLMASK; +} + +/* Used to pass group descriptor data when online resize is done */ +struct ext3_new_group_input { + __u32 group; /* Group number for this data */ + __u32 block_bitmap; /* Absolute block number of block bitmap */ + __u32 inode_bitmap; /* Absolute block number of inode bitmap */ + __u32 inode_table; /* Absolute block number of inode table start */ + __u32 blocks_count; /* Total number of blocks in this group */ + __u16 reserved_blocks; /* Number of reserved blocks in this group */ + __u16 unused; +}; + +/* The struct ext3_new_group_input in kernel space, with free_blocks_count */ +struct ext3_new_group_data { + __u32 group; + __u32 block_bitmap; + __u32 inode_bitmap; + __u32 inode_table; + __u32 blocks_count; + __u16 reserved_blocks; + __u16 unused; + __u32 free_blocks_count; +}; + + +/* + * ioctl commands + */ +#define EXT3_IOC_GETFLAGS FS_IOC_GETFLAGS +#define EXT3_IOC_SETFLAGS FS_IOC_SETFLAGS +#define EXT3_IOC_GETVERSION _IOR('f', 3, long) +#define EXT3_IOC_SETVERSION _IOW('f', 4, long) +#define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) +#define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input) +#define EXT3_IOC_GETVERSION_OLD FS_IOC_GETVERSION +#define EXT3_IOC_SETVERSION_OLD FS_IOC_SETVERSION +#ifdef CONFIG_JBD_DEBUG +#define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) +#endif +#define EXT3_IOC_GETRSVSZ _IOR('f', 5, long) +#define EXT3_IOC_SETRSVSZ _IOW('f', 6, long) + +/* + * ioctl commands in 32 bit emulation + */ +#define EXT3_IOC32_GETFLAGS FS_IOC32_GETFLAGS +#define EXT3_IOC32_SETFLAGS FS_IOC32_SETFLAGS +#define EXT3_IOC32_GETVERSION _IOR('f', 3, int) +#define EXT3_IOC32_SETVERSION _IOW('f', 4, int) +#define EXT3_IOC32_GETRSVSZ _IOR('f', 5, int) +#define EXT3_IOC32_SETRSVSZ _IOW('f', 6, int) +#define EXT3_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) +#ifdef CONFIG_JBD_DEBUG +#define EXT3_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) +#endif +#define EXT3_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION +#define EXT3_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION + +/* Number of supported quota types */ +#define EXT3_MAXQUOTAS 2 + +/* + * Mount options + */ +struct ext3_mount_options { + unsigned long s_mount_opt; + kuid_t s_resuid; + kgid_t s_resgid; + unsigned long s_commit_interval; +#ifdef CONFIG_QUOTA + int s_jquota_fmt; + char *s_qf_names[EXT3_MAXQUOTAS]; +#endif +}; + +/* + * Structure of an inode on the disk + */ +struct ext3_inode { + __le16 i_mode; /* File mode */ + __le16 i_uid; /* Low 16 bits of Owner Uid */ + __le32 i_size; /* Size in bytes */ + __le32 i_atime; /* Access time */ + __le32 i_ctime; /* Creation time */ + __le32 i_mtime; /* Modification time */ + __le32 i_dtime; /* Deletion Time */ + __le16 i_gid; /* Low 16 bits of Group Id */ + __le16 i_links_count; /* Links count */ + __le32 i_blocks; /* Blocks count */ + __le32 i_flags; /* File flags */ + union { + struct { + __u32 l_i_reserved1; + } linux1; + struct { + __u32 h_i_translator; + } hurd1; + struct { + __u32 m_i_reserved1; + } masix1; + } osd1; /* OS dependent 1 */ + __le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */ + __le32 i_generation; /* File version (for NFS) */ + __le32 i_file_acl; /* File ACL */ + __le32 i_dir_acl; /* Directory ACL */ + __le32 i_faddr; /* Fragment address */ + union { + struct { + __u8 l_i_frag; /* Fragment number */ + __u8 l_i_fsize; /* Fragment size */ + __u16 i_pad1; + __le16 l_i_uid_high; /* these 2 fields */ + __le16 l_i_gid_high; /* were reserved2[0] */ + __u32 l_i_reserved2; + } linux2; + struct { + __u8 h_i_frag; /* Fragment number */ + __u8 h_i_fsize; /* Fragment size */ + __u16 h_i_mode_high; + __u16 h_i_uid_high; + __u16 h_i_gid_high; + __u32 h_i_author; + } hurd2; + struct { + __u8 m_i_frag; /* Fragment number */ + __u8 m_i_fsize; /* Fragment size */ + __u16 m_pad1; + __u32 m_i_reserved2[2]; + } masix2; + } osd2; /* OS dependent 2 */ + __le16 i_extra_isize; + __le16 i_pad1; +}; + +#define i_size_high i_dir_acl + +#define i_reserved1 osd1.linux1.l_i_reserved1 +#define i_frag osd2.linux2.l_i_frag +#define i_fsize osd2.linux2.l_i_fsize +#define i_uid_low i_uid +#define i_gid_low i_gid +#define i_uid_high osd2.linux2.l_i_uid_high +#define i_gid_high osd2.linux2.l_i_gid_high +#define i_reserved2 osd2.linux2.l_i_reserved2 + +/* + * File system states + */ +#define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */ +#define EXT3_ERROR_FS 0x0002 /* Errors detected */ +#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ + +/* + * Misc. filesystem flags + */ +#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ +#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ +#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ + +/* + * Mount flags + */ +#define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */ +/* EXT3_MOUNT_OLDALLOC was there */ +#define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */ +#define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */ +#define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ +#define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ +#define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ +#define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ +#define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ +#define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */ +#define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ +#define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ +#define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ +#define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ +#define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ +#define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ +#define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ +#define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ +#define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */ +#define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */ +#define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */ +#define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ +#define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ +#define EXT3_MOUNT_DATA_ERR_ABORT 0x400000 /* Abort on file data write + * error in ordered mode */ + +/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */ +#ifndef _LINUX_EXT2_FS_H +#define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt +#define set_opt(o, opt) o |= EXT3_MOUNT_##opt +#define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \ + EXT3_MOUNT_##opt) +#else +#define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD +#define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT +#define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS +#endif + +#define ext3_set_bit __set_bit_le +#define ext3_set_bit_atomic ext2_set_bit_atomic +#define ext3_clear_bit __clear_bit_le +#define ext3_clear_bit_atomic ext2_clear_bit_atomic +#define ext3_test_bit test_bit_le +#define ext3_find_next_zero_bit find_next_zero_bit_le + +/* + * Maximal mount counts between two filesystem checks + */ +#define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ +#define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */ + +/* + * Behaviour when detecting errors + */ +#define EXT3_ERRORS_CONTINUE 1 /* Continue execution */ +#define EXT3_ERRORS_RO 2 /* Remount fs read-only */ +#define EXT3_ERRORS_PANIC 3 /* Panic */ +#define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE + +/* + * Structure of the super block + */ +struct ext3_super_block { +/*00*/ __le32 s_inodes_count; /* Inodes count */ + __le32 s_blocks_count; /* Blocks count */ + __le32 s_r_blocks_count; /* Reserved blocks count */ + __le32 s_free_blocks_count; /* Free blocks count */ +/*10*/ __le32 s_free_inodes_count; /* Free inodes count */ + __le32 s_first_data_block; /* First Data Block */ + __le32 s_log_block_size; /* Block size */ + __le32 s_log_frag_size; /* Fragment size */ +/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ + __le32 s_frags_per_group; /* # Fragments per group */ + __le32 s_inodes_per_group; /* # Inodes per group */ + __le32 s_mtime; /* Mount time */ +/*30*/ __le32 s_wtime; /* Write time */ + __le16 s_mnt_count; /* Mount count */ + __le16 s_max_mnt_count; /* Maximal mount count */ + __le16 s_magic; /* Magic signature */ + __le16 s_state; /* File system state */ + __le16 s_errors; /* Behaviour when detecting errors */ + __le16 s_minor_rev_level; /* minor revision level */ +/*40*/ __le32 s_lastcheck; /* time of last check */ + __le32 s_checkinterval; /* max. time between checks */ + __le32 s_creator_os; /* OS */ + __le32 s_rev_level; /* Revision level */ +/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ + __le16 s_def_resgid; /* Default gid for reserved blocks */ + /* + * These fields are for EXT3_DYNAMIC_REV superblocks only. + * + * Note: the difference between the compatible feature set and + * the incompatible feature set is that if there is a bit set + * in the incompatible feature set that the kernel doesn't + * know about, it should refuse to mount the filesystem. + * + * e2fsck's requirements are more strict; if it doesn't know + * about a feature in either the compatible or incompatible + * feature set, it must abort and not try to meddle with + * things it doesn't understand... + */ + __le32 s_first_ino; /* First non-reserved inode */ + __le16 s_inode_size; /* size of inode structure */ + __le16 s_block_group_nr; /* block group # of this superblock */ + __le32 s_feature_compat; /* compatible feature set */ +/*60*/ __le32 s_feature_incompat; /* incompatible feature set */ + __le32 s_feature_ro_compat; /* readonly-compatible feature set */ +/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ +/*78*/ char s_volume_name[16]; /* volume name */ +/*88*/ char s_last_mounted[64]; /* directory where last mounted */ +/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ + /* + * Performance hints. Directory preallocation should only + * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on. + */ + __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ + __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ + __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ + /* + * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. + */ +/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ +/*E0*/ __le32 s_journal_inum; /* inode number of journal file */ + __le32 s_journal_dev; /* device number of journal file */ + __le32 s_last_orphan; /* start of list of inodes to delete */ + __le32 s_hash_seed[4]; /* HTREE hash seed */ + __u8 s_def_hash_version; /* Default hash version to use */ + __u8 s_reserved_char_pad; + __u16 s_reserved_word_pad; + __le32 s_default_mount_opts; + __le32 s_first_meta_bg; /* First metablock block group */ + __le32 s_mkfs_time; /* When the filesystem was created */ + __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ + /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ +/*150*/ __le32 s_blocks_count_hi; /* Blocks count */ + __le32 s_r_blocks_count_hi; /* Reserved blocks count */ + __le32 s_free_blocks_count_hi; /* Free blocks count */ + __le16 s_min_extra_isize; /* All inodes have at least # bytes */ + __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ + __le32 s_flags; /* Miscellaneous flags */ + __le16 s_raid_stride; /* RAID stride */ + __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ + __le64 s_mmp_block; /* Block for multi-mount protection */ + __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ + __u8 s_log_groups_per_flex; /* FLEX_BG group size */ + __u8 s_reserved_char_pad2; + __le16 s_reserved_pad; + __u32 s_reserved[162]; /* Padding to the end of the block */ +}; + +/* data type for block offset of block group */ +typedef int ext3_grpblk_t; + +/* data type for filesystem-wide blocks number */ +typedef unsigned long ext3_fsblk_t; + +#define E3FSBLK "%lu" + +struct ext3_reserve_window { + ext3_fsblk_t _rsv_start; /* First byte reserved */ + ext3_fsblk_t _rsv_end; /* Last byte reserved or 0 */ +}; + +struct ext3_reserve_window_node { + struct rb_node rsv_node; + __u32 rsv_goal_size; + __u32 rsv_alloc_hit; + struct ext3_reserve_window rsv_window; +}; + +struct ext3_block_alloc_info { + /* information about reservation window */ + struct ext3_reserve_window_node rsv_window_node; + /* + * was i_next_alloc_block in ext3_inode_info + * is the logical (file-relative) number of the + * most-recently-allocated block in this file. + * We use this for detecting linearly ascending allocation requests. + */ + __u32 last_alloc_logical_block; + /* + * Was i_next_alloc_goal in ext3_inode_info + * is the *physical* companion to i_next_alloc_block. + * it the physical block number of the block which was most-recentl + * allocated to this file. This give us the goal (target) for the next + * allocation when we detect linearly ascending requests. + */ + ext3_fsblk_t last_alloc_physical_block; +}; + +#define rsv_start rsv_window._rsv_start +#define rsv_end rsv_window._rsv_end + +/* + * third extended file system inode data in memory + */ +struct ext3_inode_info { + __le32 i_data[15]; /* unconverted */ + __u32 i_flags; +#ifdef EXT3_FRAGMENTS + __u32 i_faddr; + __u8 i_frag_no; + __u8 i_frag_size; +#endif + ext3_fsblk_t i_file_acl; + __u32 i_dir_acl; + __u32 i_dtime; + + /* + * i_block_group is the number of the block group which contains + * this file's inode. Constant across the lifetime of the inode, + * it is ued for making block allocation decisions - we try to + * place a file's data blocks near its inode block, and new inodes + * near to their parent directory's inode. + */ + __u32 i_block_group; + unsigned long i_state_flags; /* Dynamic state flags for ext3 */ + + /* block reservation info */ + struct ext3_block_alloc_info *i_block_alloc_info; + + __u32 i_dir_start_lookup; +#ifdef CONFIG_EXT3_FS_XATTR + /* + * Extended attributes can be read independently of the main file + * data. Taking i_mutex even when reading would cause contention + * between readers of EAs and writers of regular file data, so + * instead we synchronize on xattr_sem when reading or changing + * EAs. + */ + struct rw_semaphore xattr_sem; +#endif + + struct list_head i_orphan; /* unlinked but open inodes */ + + /* + * i_disksize keeps track of what the inode size is ON DISK, not + * in memory. During truncate, i_size is set to the new size by + * the VFS prior to calling ext3_truncate(), but the filesystem won't + * set i_disksize to 0 until the truncate is actually under way. + * + * The intent is that i_disksize always represents the blocks which + * are used by this file. This allows recovery to restart truncate + * on orphans if we crash during truncate. We actually write i_disksize + * into the on-disk inode when writing inodes out, instead of i_size. + * + * The only time when i_disksize and i_size may be different is when + * a truncate is in progress. The only things which change i_disksize + * are ext3_get_block (growth) and ext3_truncate (shrinkth). + */ + loff_t i_disksize; + + /* on-disk additional length */ + __u16 i_extra_isize; + + /* + * truncate_mutex is for serialising ext3_truncate() against + * ext3_getblock(). In the 2.4 ext2 design, great chunks of inode's + * data tree are chopped off during truncate. We can't do that in + * ext3 because whenever we perform intermediate commits during + * truncate, the inode and all the metadata blocks *must* be in a + * consistent state which allows truncation of the orphans to restart + * during recovery. Hence we must fix the get_block-vs-truncate race + * by other means, so we have truncate_mutex. + */ + struct mutex truncate_mutex; + + /* + * Transactions that contain inode's metadata needed to complete + * fsync and fdatasync, respectively. + */ + atomic_t i_sync_tid; + atomic_t i_datasync_tid; + +#ifdef CONFIG_QUOTA + struct dquot *i_dquot[MAXQUOTAS]; +#endif + + struct inode vfs_inode; +}; + +/* + * third extended-fs super-block data in memory + */ +struct ext3_sb_info { + unsigned long s_frag_size; /* Size of a fragment in bytes */ + unsigned long s_frags_per_block;/* Number of fragments per block */ + unsigned long s_inodes_per_block;/* Number of inodes per block */ + unsigned long s_frags_per_group;/* Number of fragments in a group */ + unsigned long s_blocks_per_group;/* Number of blocks in a group */ + unsigned long s_inodes_per_group;/* Number of inodes in a group */ + unsigned long s_itb_per_group; /* Number of inode table blocks per group */ + unsigned long s_gdb_count; /* Number of group descriptor blocks */ + unsigned long s_desc_per_block; /* Number of group descriptors per block */ + unsigned long s_groups_count; /* Number of groups in the fs */ + unsigned long s_overhead_last; /* Last calculated overhead */ + unsigned long s_blocks_last; /* Last seen block count */ + struct buffer_head * s_sbh; /* Buffer containing the super block */ + struct ext3_super_block * s_es; /* Pointer to the super block in the buffer */ + struct buffer_head ** s_group_desc; + unsigned long s_mount_opt; + ext3_fsblk_t s_sb_block; + kuid_t s_resuid; + kgid_t s_resgid; + unsigned short s_mount_state; + unsigned short s_pad; + int s_addr_per_block_bits; + int s_desc_per_block_bits; + int s_inode_size; + int s_first_ino; + spinlock_t s_next_gen_lock; + u32 s_next_generation; + u32 s_hash_seed[4]; + int s_def_hash_version; + int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ + struct percpu_counter s_freeblocks_counter; + struct percpu_counter s_freeinodes_counter; + struct percpu_counter s_dirs_counter; + struct blockgroup_lock *s_blockgroup_lock; + + /* root of the per fs reservation window tree */ + spinlock_t s_rsv_window_lock; + struct rb_root s_rsv_window_root; + struct ext3_reserve_window_node s_rsv_window_head; + + /* Journaling */ + struct inode * s_journal_inode; + struct journal_s * s_journal; + struct list_head s_orphan; + struct mutex s_orphan_lock; + struct mutex s_resize_lock; + unsigned long s_commit_interval; + struct block_device *journal_bdev; +#ifdef CONFIG_QUOTA + char *s_qf_names[EXT3_MAXQUOTAS]; /* Names of quota files with journalled quota */ + int s_jquota_fmt; /* Format of quota to use */ +#endif +}; + +static inline spinlock_t * +sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group) +{ + return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); +} + +static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb) +{ + return sb->s_fs_info; +} +static inline struct ext3_inode_info *EXT3_I(struct inode *inode) +{ + return container_of(inode, struct ext3_inode_info, vfs_inode); +} + +static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino) +{ + return ino == EXT3_ROOT_INO || + ino == EXT3_JOURNAL_INO || + ino == EXT3_RESIZE_INO || + (ino >= EXT3_FIRST_INO(sb) && + ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count)); +} + +/* + * Inode dynamic state flags + */ +enum { + EXT3_STATE_JDATA, /* journaled data exists */ + EXT3_STATE_NEW, /* inode is newly created */ + EXT3_STATE_XATTR, /* has in-inode xattrs */ + EXT3_STATE_FLUSH_ON_CLOSE, /* flush dirty pages on close */ +}; + +static inline int ext3_test_inode_state(struct inode *inode, int bit) +{ + return test_bit(bit, &EXT3_I(inode)->i_state_flags); +} + +static inline void ext3_set_inode_state(struct inode *inode, int bit) +{ + set_bit(bit, &EXT3_I(inode)->i_state_flags); +} + +static inline void ext3_clear_inode_state(struct inode *inode, int bit) +{ + clear_bit(bit, &EXT3_I(inode)->i_state_flags); +} + +#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime + +/* + * Codes for operating systems + */ +#define EXT3_OS_LINUX 0 +#define EXT3_OS_HURD 1 +#define EXT3_OS_MASIX 2 +#define EXT3_OS_FREEBSD 3 +#define EXT3_OS_LITES 4 + +/* + * Revision levels + */ +#define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */ +#define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ + +#define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV +#define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV + +#define EXT3_GOOD_OLD_INODE_SIZE 128 + +/* + * Feature set definitions + */ + +#define EXT3_HAS_COMPAT_FEATURE(sb,mask) \ + ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) +#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \ + ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) +#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \ + ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) +#define EXT3_SET_COMPAT_FEATURE(sb,mask) \ + EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) +#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \ + EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) +#define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \ + EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) +#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \ + EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) +#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ + EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) +#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \ + EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) + +#define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001 +#define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002 +#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 +#define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008 +#define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010 +#define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020 + +#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 +#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 +#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 + +#define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001 +#define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002 +#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ +#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ +#define EXT3_FEATURE_INCOMPAT_META_BG 0x0010 + +#define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR +#define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \ + EXT3_FEATURE_INCOMPAT_RECOVER| \ + EXT3_FEATURE_INCOMPAT_META_BG) +#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \ + EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \ + EXT3_FEATURE_RO_COMPAT_BTREE_DIR) + +/* + * Default values for user and/or group using reserved blocks + */ +#define EXT3_DEF_RESUID 0 +#define EXT3_DEF_RESGID 0 + +/* + * Default mount options + */ +#define EXT3_DEFM_DEBUG 0x0001 +#define EXT3_DEFM_BSDGROUPS 0x0002 +#define EXT3_DEFM_XATTR_USER 0x0004 +#define EXT3_DEFM_ACL 0x0008 +#define EXT3_DEFM_UID16 0x0010 +#define EXT3_DEFM_JMODE 0x0060 +#define EXT3_DEFM_JMODE_DATA 0x0020 +#define EXT3_DEFM_JMODE_ORDERED 0x0040 +#define EXT3_DEFM_JMODE_WBACK 0x0060 + +/* + * Structure of a directory entry + */ +#define EXT3_NAME_LEN 255 + +struct ext3_dir_entry { + __le32 inode; /* Inode number */ + __le16 rec_len; /* Directory entry length */ + __le16 name_len; /* Name length */ + char name[EXT3_NAME_LEN]; /* File name */ +}; + +/* + * The new version of the directory entry. Since EXT3 structures are + * stored in intel byte order, and the name_len field could never be + * bigger than 255 chars, it's safe to reclaim the extra byte for the + * file_type field. + */ +struct ext3_dir_entry_2 { + __le32 inode; /* Inode number */ + __le16 rec_len; /* Directory entry length */ + __u8 name_len; /* Name length */ + __u8 file_type; + char name[EXT3_NAME_LEN]; /* File name */ +}; + +/* + * Ext3 directory file types. Only the low 3 bits are used. The + * other bits are reserved for now. + */ +#define EXT3_FT_UNKNOWN 0 +#define EXT3_FT_REG_FILE 1 +#define EXT3_FT_DIR 2 +#define EXT3_FT_CHRDEV 3 +#define EXT3_FT_BLKDEV 4 +#define EXT3_FT_FIFO 5 +#define EXT3_FT_SOCK 6 +#define EXT3_FT_SYMLINK 7 + +#define EXT3_FT_MAX 8 + +/* + * EXT3_DIR_PAD defines the directory entries boundaries + * + * NOTE: It must be a multiple of 4 + */ +#define EXT3_DIR_PAD 4 +#define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1) +#define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \ + ~EXT3_DIR_ROUND) +#define EXT3_MAX_REC_LEN ((1<<16)-1) + +/* + * Tests against MAX_REC_LEN etc were put in place for 64k block + * sizes; if that is not possible on this arch, we can skip + * those tests and speed things up. + */ +static inline unsigned ext3_rec_len_from_disk(__le16 dlen) +{ + unsigned len = le16_to_cpu(dlen); + +#if (PAGE_CACHE_SIZE >= 65536) + if (len == EXT3_MAX_REC_LEN) + return 1 << 16; +#endif + return len; +} + +static inline __le16 ext3_rec_len_to_disk(unsigned len) +{ +#if (PAGE_CACHE_SIZE >= 65536) + if (len == (1 << 16)) + return cpu_to_le16(EXT3_MAX_REC_LEN); + else if (len > (1 << 16)) + BUG(); +#endif + return cpu_to_le16(len); +} + +/* + * Hash Tree Directory indexing + * (c) Daniel Phillips, 2001 + */ + +#define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \ + EXT3_FEATURE_COMPAT_DIR_INDEX) && \ + (EXT3_I(dir)->i_flags & EXT3_INDEX_FL)) +#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX) +#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) + +/* Legal values for the dx_root hash_version field: */ + +#define DX_HASH_LEGACY 0 +#define DX_HASH_HALF_MD4 1 +#define DX_HASH_TEA 2 +#define DX_HASH_LEGACY_UNSIGNED 3 +#define DX_HASH_HALF_MD4_UNSIGNED 4 +#define DX_HASH_TEA_UNSIGNED 5 + +/* hash info structure used by the directory hash */ +struct dx_hash_info +{ + u32 hash; + u32 minor_hash; + int hash_version; + u32 *seed; +}; + + +/* 32 and 64 bit signed EOF for dx directories */ +#define EXT3_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) +#define EXT3_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) + + +/* + * Control parameters used by ext3_htree_next_block + */ +#define HASH_NB_ALWAYS 1 + + +/* + * Describe an inode's exact location on disk and in memory + */ +struct ext3_iloc +{ + struct buffer_head *bh; + unsigned long offset; + unsigned long block_group; +}; + +static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc) +{ + return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset); +} + +/* + * This structure is stuffed into the struct file's private_data field + * for directories. It is where we put information so that we can do + * readdir operations in hash tree order. + */ +struct dir_private_info { + struct rb_root root; + struct rb_node *curr_node; + struct fname *extra_fname; + loff_t last_pos; + __u32 curr_hash; + __u32 curr_minor_hash; + __u32 next_hash; +}; + +/* calculate the first block number of the group */ +static inline ext3_fsblk_t +ext3_group_first_block_no(struct super_block *sb, unsigned long group_no) +{ + return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) + + le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block); +} + +/* + * Special error return code only used by dx_probe() and its callers. + */ +#define ERR_BAD_DX_DIR -75000 + +/* + * Function prototypes + */ + +/* + * Ok, these declarations are also in but none of the + * ext3 source programs needs to include it so they are duplicated here. + */ +# define NORET_TYPE /**/ +# define ATTRIB_NORET __attribute__((noreturn)) +# define NORET_AND noreturn, + +/* balloc.c */ +extern int ext3_bg_has_super(struct super_block *sb, int group); +extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group); +extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode, + ext3_fsblk_t goal, int *errp); +extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode, + ext3_fsblk_t goal, unsigned long *count, int *errp); +extern void ext3_free_blocks (handle_t *handle, struct inode *inode, + ext3_fsblk_t block, unsigned long count); +extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb, + ext3_fsblk_t block, unsigned long count, + unsigned long *pdquot_freed_blocks); +extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *); +extern void ext3_check_blocks_bitmap (struct super_block *); +extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb, + unsigned int block_group, + struct buffer_head ** bh); +extern int ext3_should_retry_alloc(struct super_block *sb, int *retries); +extern void ext3_init_block_alloc_info(struct inode *); +extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv); +extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range); + +/* dir.c */ +extern int ext3_check_dir_entry(const char *, struct inode *, + struct ext3_dir_entry_2 *, + struct buffer_head *, unsigned long); +extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash, + __u32 minor_hash, + struct ext3_dir_entry_2 *dirent); +extern void ext3_htree_free_dir_info(struct dir_private_info *p); + +/* fsync.c */ +extern int ext3_sync_file(struct file *, loff_t, loff_t, int); + +/* hash.c */ +extern int ext3fs_dirhash(const char *name, int len, struct + dx_hash_info *hinfo); + +/* ialloc.c */ +extern struct inode * ext3_new_inode (handle_t *, struct inode *, + const struct qstr *, umode_t); +extern void ext3_free_inode (handle_t *, struct inode *); +extern struct inode * ext3_orphan_get (struct super_block *, unsigned long); +extern unsigned long ext3_count_free_inodes (struct super_block *); +extern unsigned long ext3_count_dirs (struct super_block *); +extern void ext3_check_inodes_bitmap (struct super_block *); +extern unsigned long ext3_count_free (struct buffer_head *, unsigned); + + +/* inode.c */ +int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode, + struct buffer_head *bh, ext3_fsblk_t blocknr); +struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *); +struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *); +int ext3_get_blocks_handle(handle_t *handle, struct inode *inode, + sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result, + int create); + +extern struct inode *ext3_iget(struct super_block *, unsigned long); +extern int ext3_write_inode (struct inode *, struct writeback_control *); +extern int ext3_setattr (struct dentry *, struct iattr *); +extern void ext3_evict_inode (struct inode *); +extern int ext3_sync_inode (handle_t *, struct inode *); +extern void ext3_discard_reservation (struct inode *); +extern void ext3_dirty_inode(struct inode *, int); +extern int ext3_change_inode_journal_flag(struct inode *, int); +extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *); +extern int ext3_can_truncate(struct inode *inode); +extern void ext3_truncate(struct inode *inode); +extern void ext3_set_inode_flags(struct inode *); +extern void ext3_get_inode_flags(struct ext3_inode_info *); +extern void ext3_set_aops(struct inode *inode); +extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, + u64 start, u64 len); + +/* ioctl.c */ +extern long ext3_ioctl(struct file *, unsigned int, unsigned long); +extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long); + +/* namei.c */ +extern int ext3_orphan_add(handle_t *, struct inode *); +extern int ext3_orphan_del(handle_t *, struct inode *); +extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash, + __u32 start_minor_hash, __u32 *next_hash); + +/* resize.c */ +extern int ext3_group_add(struct super_block *sb, + struct ext3_new_group_data *input); +extern int ext3_group_extend(struct super_block *sb, + struct ext3_super_block *es, + ext3_fsblk_t n_blocks_count); + +/* super.c */ +extern __printf(3, 4) +void ext3_error(struct super_block *, const char *, const char *, ...); +extern void __ext3_std_error (struct super_block *, const char *, int); +extern __printf(3, 4) +void ext3_abort(struct super_block *, const char *, const char *, ...); +extern __printf(3, 4) +void ext3_warning(struct super_block *, const char *, const char *, ...); +extern __printf(3, 4) +void ext3_msg(struct super_block *, const char *, const char *, ...); +extern void ext3_update_dynamic_rev (struct super_block *sb); + +#define ext3_std_error(sb, errno) \ +do { \ + if ((errno)) \ + __ext3_std_error((sb), __func__, (errno)); \ +} while (0) + +/* + * Inodes and files operations + */ + +/* dir.c */ +extern const struct file_operations ext3_dir_operations; + +/* file.c */ +extern const struct inode_operations ext3_file_inode_operations; +extern const struct file_operations ext3_file_operations; + +/* namei.c */ +extern const struct inode_operations ext3_dir_inode_operations; +extern const struct inode_operations ext3_special_inode_operations; + +/* symlink.c */ +extern const struct inode_operations ext3_symlink_inode_operations; +extern const struct inode_operations ext3_fast_symlink_inode_operations; + +#define EXT3_JOURNAL(inode) (EXT3_SB((inode)->i_sb)->s_journal) + +/* Define the number of blocks we need to account to a transaction to + * modify one block of data. + * + * We may have to touch one inode, one bitmap buffer, up to three + * indirection blocks, the group and superblock summaries, and the data + * block to complete the transaction. */ + +#define EXT3_SINGLEDATA_TRANS_BLOCKS 8U + +/* Extended attribute operations touch at most two data buffers, + * two bitmap buffers, and two group summaries, in addition to the inode + * and the superblock, which are already accounted for. */ + +#define EXT3_XATTR_TRANS_BLOCKS 6U + +/* Define the minimum size for a transaction which modifies data. This + * needs to take into account the fact that we may end up modifying two + * quota files too (one for the group, one for the user quota). The + * superblock only gets updated once, of course, so don't bother + * counting that again for the quota updates. */ + +#define EXT3_DATA_TRANS_BLOCKS(sb) (EXT3_SINGLEDATA_TRANS_BLOCKS + \ + EXT3_XATTR_TRANS_BLOCKS - 2 + \ + EXT3_MAXQUOTAS_TRANS_BLOCKS(sb)) + +/* Delete operations potentially hit one directory's namespace plus an + * entire inode, plus arbitrary amounts of bitmap/indirection data. Be + * generous. We can grow the delete transaction later if necessary. */ + +#define EXT3_DELETE_TRANS_BLOCKS(sb) (EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) + 64) + +/* Define an arbitrary limit for the amount of data we will anticipate + * writing to any given transaction. For unbounded transactions such as + * write(2) and truncate(2) we can write more than this, but we always + * start off at the maximum transaction size and grow the transaction + * optimistically as we go. */ + +#define EXT3_MAX_TRANS_DATA 64U + +/* We break up a large truncate or write transaction once the handle's + * buffer credits gets this low, we need either to extend the + * transaction or to start a new one. Reserve enough space here for + * inode, bitmap, superblock, group and indirection updates for at least + * one block, plus two quota updates. Quota allocations are not + * needed. */ + +#define EXT3_RESERVE_TRANS_BLOCKS 12U + +#define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8 + +#ifdef CONFIG_QUOTA +/* Amount of blocks needed for quota update - we know that the structure was + * allocated so we need to update only inode+data */ +#define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0) +/* Amount of blocks needed for quota insert/delete - we do some block writes + * but inode, sb and group updates are done only once */ +#define EXT3_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\ + (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0) +#define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\ + (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0) +#else +#define EXT3_QUOTA_TRANS_BLOCKS(sb) 0 +#define EXT3_QUOTA_INIT_BLOCKS(sb) 0 +#define EXT3_QUOTA_DEL_BLOCKS(sb) 0 +#endif +#define EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_TRANS_BLOCKS(sb)) +#define EXT3_MAXQUOTAS_INIT_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_INIT_BLOCKS(sb)) +#define EXT3_MAXQUOTAS_DEL_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_DEL_BLOCKS(sb)) + +int +ext3_mark_iloc_dirty(handle_t *handle, + struct inode *inode, + struct ext3_iloc *iloc); + +/* + * On success, We end up with an outstanding reference count against + * iloc->bh. This _must_ be cleaned up later. + */ + +int ext3_reserve_inode_write(handle_t *handle, struct inode *inode, + struct ext3_iloc *iloc); + +int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode); + +/* + * Wrapper functions with which ext3 calls into JBD. The intent here is + * to allow these to be turned into appropriate stubs so ext3 can control + * ext2 filesystems, so ext2+ext3 systems only nee one fs. This work hasn't + * been done yet. + */ + +static inline void ext3_journal_release_buffer(handle_t *handle, + struct buffer_head *bh) +{ + journal_release_buffer(handle, bh); +} + +void ext3_journal_abort_handle(const char *caller, const char *err_fn, + struct buffer_head *bh, handle_t *handle, int err); + +int __ext3_journal_get_undo_access(const char *where, handle_t *handle, + struct buffer_head *bh); + +int __ext3_journal_get_write_access(const char *where, handle_t *handle, + struct buffer_head *bh); + +int __ext3_journal_forget(const char *where, handle_t *handle, + struct buffer_head *bh); + +int __ext3_journal_revoke(const char *where, handle_t *handle, + unsigned long blocknr, struct buffer_head *bh); + +int __ext3_journal_get_create_access(const char *where, + handle_t *handle, struct buffer_head *bh); + +int __ext3_journal_dirty_metadata(const char *where, + handle_t *handle, struct buffer_head *bh); + +#define ext3_journal_get_undo_access(handle, bh) \ + __ext3_journal_get_undo_access(__func__, (handle), (bh)) +#define ext3_journal_get_write_access(handle, bh) \ + __ext3_journal_get_write_access(__func__, (handle), (bh)) +#define ext3_journal_revoke(handle, blocknr, bh) \ + __ext3_journal_revoke(__func__, (handle), (blocknr), (bh)) +#define ext3_journal_get_create_access(handle, bh) \ + __ext3_journal_get_create_access(__func__, (handle), (bh)) +#define ext3_journal_dirty_metadata(handle, bh) \ + __ext3_journal_dirty_metadata(__func__, (handle), (bh)) +#define ext3_journal_forget(handle, bh) \ + __ext3_journal_forget(__func__, (handle), (bh)) + +int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh); + +handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks); +int __ext3_journal_stop(const char *where, handle_t *handle); + +static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks) +{ + return ext3_journal_start_sb(inode->i_sb, nblocks); +} + +#define ext3_journal_stop(handle) \ + __ext3_journal_stop(__func__, (handle)) + +static inline handle_t *ext3_journal_current_handle(void) +{ + return journal_current_handle(); +} + +static inline int ext3_journal_extend(handle_t *handle, int nblocks) +{ + return journal_extend(handle, nblocks); +} + +static inline int ext3_journal_restart(handle_t *handle, int nblocks) +{ + return journal_restart(handle, nblocks); +} + +static inline int ext3_journal_blocks_per_page(struct inode *inode) +{ + return journal_blocks_per_page(inode); +} + +static inline int ext3_journal_force_commit(journal_t *journal) +{ + return journal_force_commit(journal); +} + +/* super.c */ +int ext3_force_commit(struct super_block *sb); + +static inline int ext3_should_journal_data(struct inode *inode) +{ + if (!S_ISREG(inode->i_mode)) + return 1; + if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA) + return 1; + if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL) + return 1; + return 0; +} + +static inline int ext3_should_order_data(struct inode *inode) +{ + if (!S_ISREG(inode->i_mode)) + return 0; + if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL) + return 0; + if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA) + return 1; + return 0; +} + +static inline int ext3_should_writeback_data(struct inode *inode) +{ + if (!S_ISREG(inode->i_mode)) + return 0; + if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL) + return 0; + if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA) + return 1; + return 0; +} + +#include diff --git a/kernel/fs/ext3/ext3_jbd.c b/kernel/fs/ext3/ext3_jbd.c new file mode 100644 index 000000000..785a3261a --- /dev/null +++ b/kernel/fs/ext3/ext3_jbd.c @@ -0,0 +1,59 @@ +/* + * Interface between ext3 and JBD + */ + +#include "ext3.h" + +int __ext3_journal_get_undo_access(const char *where, handle_t *handle, + struct buffer_head *bh) +{ + int err = journal_get_undo_access(handle, bh); + if (err) + ext3_journal_abort_handle(where, __func__, bh, handle,err); + return err; +} + +int __ext3_journal_get_write_access(const char *where, handle_t *handle, + struct buffer_head *bh) +{ + int err = journal_get_write_access(handle, bh); + if (err) + ext3_journal_abort_handle(where, __func__, bh, handle,err); + return err; +} + +int __ext3_journal_forget(const char *where, handle_t *handle, + struct buffer_head *bh) +{ + int err = journal_forget(handle, bh); + if (err) + ext3_journal_abort_handle(where, __func__, bh, handle,err); + return err; +} + +int __ext3_journal_revoke(const char *where, handle_t *handle, + unsigned long blocknr, struct buffer_head *bh) +{ + int err = journal_revoke(handle, blocknr, bh); + if (err) + ext3_journal_abort_handle(where, __func__, bh, handle,err); + return err; +} + +int __ext3_journal_get_create_access(const char *where, + handle_t *handle, struct buffer_head *bh) +{ + int err = journal_get_create_access(handle, bh); + if (err) + ext3_journal_abort_handle(where, __func__, bh, handle,err); + return err; +} + +int __ext3_journal_dirty_metadata(const char *where, + handle_t *handle, struct buffer_head *bh) +{ + int err = journal_dirty_metadata(handle, bh); + if (err) + ext3_journal_abort_handle(where, __func__, bh, handle,err); + return err; +} diff --git a/kernel/fs/ext3/file.c b/kernel/fs/ext3/file.c new file mode 100644 index 000000000..3b8f650de --- /dev/null +++ b/kernel/fs/ext3/file.c @@ -0,0 +1,79 @@ +/* + * linux/fs/ext3/file.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/file.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * ext3 fs regular file handling primitives + * + * 64-bit file support on 64-bit platforms by Jakub Jelinek + * (jj@sunsite.ms.mff.cuni.cz) + */ + +#include +#include "ext3.h" +#include "xattr.h" +#include "acl.h" + +/* + * Called when an inode is released. Note that this is different + * from ext3_file_open: open gets called at every open, but release + * gets called only when /all/ the files are closed. + */ +static int ext3_release_file (struct inode * inode, struct file * filp) +{ + if (ext3_test_inode_state(inode, EXT3_STATE_FLUSH_ON_CLOSE)) { + filemap_flush(inode->i_mapping); + ext3_clear_inode_state(inode, EXT3_STATE_FLUSH_ON_CLOSE); + } + /* if we are the last writer on the inode, drop the block reservation */ + if ((filp->f_mode & FMODE_WRITE) && + (atomic_read(&inode->i_writecount) == 1)) + { + mutex_lock(&EXT3_I(inode)->truncate_mutex); + ext3_discard_reservation(inode); + mutex_unlock(&EXT3_I(inode)->truncate_mutex); + } + if (is_dx(inode) && filp->private_data) + ext3_htree_free_dir_info(filp->private_data); + + return 0; +} + +const struct file_operations ext3_file_operations = { + .llseek = generic_file_llseek, + .read_iter = generic_file_read_iter, + .write_iter = generic_file_write_iter, + .unlocked_ioctl = ext3_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = ext3_compat_ioctl, +#endif + .mmap = generic_file_mmap, + .open = dquot_file_open, + .release = ext3_release_file, + .fsync = ext3_sync_file, + .splice_read = generic_file_splice_read, + .splice_write = iter_file_splice_write, +}; + +const struct inode_operations ext3_file_inode_operations = { + .setattr = ext3_setattr, +#ifdef CONFIG_EXT3_FS_XATTR + .setxattr = generic_setxattr, + .getxattr = generic_getxattr, + .listxattr = ext3_listxattr, + .removexattr = generic_removexattr, +#endif + .get_acl = ext3_get_acl, + .set_acl = ext3_set_acl, + .fiemap = ext3_fiemap, +}; + diff --git a/kernel/fs/ext3/fsync.c b/kernel/fs/ext3/fsync.c new file mode 100644 index 000000000..1cb9c7e10 --- /dev/null +++ b/kernel/fs/ext3/fsync.c @@ -0,0 +1,109 @@ +/* + * linux/fs/ext3/fsync.c + * + * Copyright (C) 1993 Stephen Tweedie (sct@redhat.com) + * from + * Copyright (C) 1992 Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * from + * linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds + * + * ext3fs fsync primitive + * + * Big-endian to little-endian byte-swapping/bitmaps by + * David S. Miller (davem@caip.rutgers.edu), 1995 + * + * Removed unnecessary code duplication for little endian machines + * and excessive __inline__s. + * Andi Kleen, 1997 + * + * Major simplications and cleanup - we only need to do the metadata, because + * we can depend on generic_block_fdatasync() to sync the data blocks. + */ + +#include +#include +#include "ext3.h" + +/* + * akpm: A new design for ext3_sync_file(). + * + * This is only called from sys_fsync(), sys_fdatasync() and sys_msync(). + * There cannot be a transaction open by this task. + * Another task could have dirtied this inode. Its data can be in any + * state in the journalling system. + * + * What we do is just kick off a commit and wait on it. This will snapshot the + * inode to disk. + */ + +int ext3_sync_file(struct file *file, loff_t start, loff_t end, int datasync) +{ + struct inode *inode = file->f_mapping->host; + struct ext3_inode_info *ei = EXT3_I(inode); + journal_t *journal = EXT3_SB(inode->i_sb)->s_journal; + int ret, needs_barrier = 0; + tid_t commit_tid; + + trace_ext3_sync_file_enter(file, datasync); + + if (inode->i_sb->s_flags & MS_RDONLY) { + /* Make sure that we read updated state */ + smp_rmb(); + if (EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS) + return -EROFS; + return 0; + } + ret = filemap_write_and_wait_range(inode->i_mapping, start, end); + if (ret) + goto out; + + J_ASSERT(ext3_journal_current_handle() == NULL); + + /* + * data=writeback,ordered: + * The caller's filemap_fdatawrite()/wait will sync the data. + * Metadata is in the journal, we wait for a proper transaction + * to commit here. + * + * data=journal: + * filemap_fdatawrite won't do anything (the buffers are clean). + * ext3_force_commit will write the file data into the journal and + * will wait on that. + * filemap_fdatawait() will encounter a ton of newly-dirtied pages + * (they were dirtied by commit). But that's OK - the blocks are + * safe in-journal, which is all fsync() needs to ensure. + */ + if (ext3_should_journal_data(inode)) { + ret = ext3_force_commit(inode->i_sb); + goto out; + } + + if (datasync) + commit_tid = atomic_read(&ei->i_datasync_tid); + else + commit_tid = atomic_read(&ei->i_sync_tid); + + if (test_opt(inode->i_sb, BARRIER) && + !journal_trans_will_send_data_barrier(journal, commit_tid)) + needs_barrier = 1; + log_start_commit(journal, commit_tid); + ret = log_wait_commit(journal, commit_tid); + + /* + * In case we didn't commit a transaction, we have to flush + * disk caches manually so that data really is on persistent + * storage + */ + if (needs_barrier) { + int err; + + err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL); + if (!ret) + ret = err; + } +out: + trace_ext3_sync_file_exit(inode, ret); + return ret; +} diff --git a/kernel/fs/ext3/hash.c b/kernel/fs/ext3/hash.c new file mode 100644 index 000000000..ede315cdf --- /dev/null +++ b/kernel/fs/ext3/hash.c @@ -0,0 +1,206 @@ +/* + * linux/fs/ext3/hash.c + * + * Copyright (C) 2002 by Theodore Ts'o + * + * This file is released under the GPL v2. + * + * This file may be redistributed under the terms of the GNU Public + * License. + */ + +#include "ext3.h" +#include + +#define DELTA 0x9E3779B9 + +static void TEA_transform(__u32 buf[4], __u32 const in[]) +{ + __u32 sum = 0; + __u32 b0 = buf[0], b1 = buf[1]; + __u32 a = in[0], b = in[1], c = in[2], d = in[3]; + int n = 16; + + do { + sum += DELTA; + b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b); + b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d); + } while(--n); + + buf[0] += b0; + buf[1] += b1; +} + + +/* The old legacy hash */ +static __u32 dx_hack_hash_unsigned(const char *name, int len) +{ + __u32 hash, hash0 = 0x12a3fe2d, hash1 = 0x37abe8f9; + const unsigned char *ucp = (const unsigned char *) name; + + while (len--) { + hash = hash1 + (hash0 ^ (((int) *ucp++) * 7152373)); + + if (hash & 0x80000000) + hash -= 0x7fffffff; + hash1 = hash0; + hash0 = hash; + } + return hash0 << 1; +} + +static __u32 dx_hack_hash_signed(const char *name, int len) +{ + __u32 hash, hash0 = 0x12a3fe2d, hash1 = 0x37abe8f9; + const signed char *scp = (const signed char *) name; + + while (len--) { + hash = hash1 + (hash0 ^ (((int) *scp++) * 7152373)); + + if (hash & 0x80000000) + hash -= 0x7fffffff; + hash1 = hash0; + hash0 = hash; + } + return hash0 << 1; +} + +static void str2hashbuf_signed(const char *msg, int len, __u32 *buf, int num) +{ + __u32 pad, val; + int i; + const signed char *scp = (const signed char *) msg; + + pad = (__u32)len | ((__u32)len << 8); + pad |= pad << 16; + + val = pad; + if (len > num*4) + len = num * 4; + for (i = 0; i < len; i++) { + if ((i % 4) == 0) + val = pad; + val = ((int) scp[i]) + (val << 8); + if ((i % 4) == 3) { + *buf++ = val; + val = pad; + num--; + } + } + if (--num >= 0) + *buf++ = val; + while (--num >= 0) + *buf++ = pad; +} + +static void str2hashbuf_unsigned(const char *msg, int len, __u32 *buf, int num) +{ + __u32 pad, val; + int i; + const unsigned char *ucp = (const unsigned char *) msg; + + pad = (__u32)len | ((__u32)len << 8); + pad |= pad << 16; + + val = pad; + if (len > num*4) + len = num * 4; + for (i=0; i < len; i++) { + if ((i % 4) == 0) + val = pad; + val = ((int) ucp[i]) + (val << 8); + if ((i % 4) == 3) { + *buf++ = val; + val = pad; + num--; + } + } + if (--num >= 0) + *buf++ = val; + while (--num >= 0) + *buf++ = pad; +} + +/* + * Returns the hash of a filename. If len is 0 and name is NULL, then + * this function can be used to test whether or not a hash version is + * supported. + * + * The seed is an 4 longword (32 bits) "secret" which can be used to + * uniquify a hash. If the seed is all zero's, then some default seed + * may be used. + * + * A particular hash version specifies whether or not the seed is + * represented, and whether or not the returned hash is 32 bits or 64 + * bits. 32 bit hashes will return 0 for the minor hash. + */ +int ext3fs_dirhash(const char *name, int len, struct dx_hash_info *hinfo) +{ + __u32 hash; + __u32 minor_hash = 0; + const char *p; + int i; + __u32 in[8], buf[4]; + void (*str2hashbuf)(const char *, int, __u32 *, int) = + str2hashbuf_signed; + + /* Initialize the default seed for the hash checksum functions */ + buf[0] = 0x67452301; + buf[1] = 0xefcdab89; + buf[2] = 0x98badcfe; + buf[3] = 0x10325476; + + /* Check to see if the seed is all zero's */ + if (hinfo->seed) { + for (i=0; i < 4; i++) { + if (hinfo->seed[i]) + break; + } + if (i < 4) + memcpy(buf, hinfo->seed, sizeof(buf)); + } + + switch (hinfo->hash_version) { + case DX_HASH_LEGACY_UNSIGNED: + hash = dx_hack_hash_unsigned(name, len); + break; + case DX_HASH_LEGACY: + hash = dx_hack_hash_signed(name, len); + break; + case DX_HASH_HALF_MD4_UNSIGNED: + str2hashbuf = str2hashbuf_unsigned; + case DX_HASH_HALF_MD4: + p = name; + while (len > 0) { + (*str2hashbuf)(p, len, in, 8); + half_md4_transform(buf, in); + len -= 32; + p += 32; + } + minor_hash = buf[2]; + hash = buf[1]; + break; + case DX_HASH_TEA_UNSIGNED: + str2hashbuf = str2hashbuf_unsigned; + case DX_HASH_TEA: + p = name; + while (len > 0) { + (*str2hashbuf)(p, len, in, 4); + TEA_transform(buf, in); + len -= 16; + p += 16; + } + hash = buf[0]; + minor_hash = buf[1]; + break; + default: + hinfo->hash = 0; + return -1; + } + hash = hash & ~1; + if (hash == (EXT3_HTREE_EOF_32BIT << 1)) + hash = (EXT3_HTREE_EOF_32BIT - 1) << 1; + hinfo->hash = hash; + hinfo->minor_hash = minor_hash; + return 0; +} diff --git a/kernel/fs/ext3/ialloc.c b/kernel/fs/ext3/ialloc.c new file mode 100644 index 000000000..3ad242e58 --- /dev/null +++ b/kernel/fs/ext3/ialloc.c @@ -0,0 +1,706 @@ +/* + * linux/fs/ext3/ialloc.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * BSD ufs-inspired inode and directory allocation by + * Stephen Tweedie (sct@redhat.com), 1993 + * Big-endian to little-endian byte-swapping/bitmaps by + * David S. Miller (davem@caip.rutgers.edu), 1995 + */ + +#include +#include + +#include "ext3.h" +#include "xattr.h" +#include "acl.h" + +/* + * ialloc.c contains the inodes allocation and deallocation routines + */ + +/* + * The free inodes are managed by bitmaps. A file system contains several + * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap + * block for inodes, N blocks for the inode table and data blocks. + * + * The file system contains group descriptors which are located after the + * super block. Each descriptor contains the number of the bitmap block and + * the free blocks count in the block. + */ + + +/* + * Read the inode allocation bitmap for a given block_group, reading + * into the specified slot in the superblock's bitmap cache. + * + * Return buffer_head of bitmap on success or NULL. + */ +static struct buffer_head * +read_inode_bitmap(struct super_block * sb, unsigned long block_group) +{ + struct ext3_group_desc *desc; + struct buffer_head *bh = NULL; + + desc = ext3_get_group_desc(sb, block_group, NULL); + if (!desc) + goto error_out; + + bh = sb_bread(sb, le32_to_cpu(desc->bg_inode_bitmap)); + if (!bh) + ext3_error(sb, "read_inode_bitmap", + "Cannot read inode bitmap - " + "block_group = %lu, inode_bitmap = %u", + block_group, le32_to_cpu(desc->bg_inode_bitmap)); +error_out: + return bh; +} + +/* + * NOTE! When we get the inode, we're the only people + * that have access to it, and as such there are no + * race conditions we have to worry about. The inode + * is not on the hash-lists, and it cannot be reached + * through the filesystem because the directory entry + * has been deleted earlier. + * + * HOWEVER: we must make sure that we get no aliases, + * which means that we have to call "clear_inode()" + * _before_ we mark the inode not in use in the inode + * bitmaps. Otherwise a newly created file might use + * the same inode number (not actually the same pointer + * though), and then we'd have two inodes sharing the + * same inode number and space on the harddisk. + */ +void ext3_free_inode (handle_t *handle, struct inode * inode) +{ + struct super_block * sb = inode->i_sb; + int is_directory; + unsigned long ino; + struct buffer_head *bitmap_bh = NULL; + struct buffer_head *bh2; + unsigned long block_group; + unsigned long bit; + struct ext3_group_desc * gdp; + struct ext3_super_block * es; + struct ext3_sb_info *sbi; + int fatal = 0, err; + + if (atomic_read(&inode->i_count) > 1) { + printk ("ext3_free_inode: inode has count=%d\n", + atomic_read(&inode->i_count)); + return; + } + if (inode->i_nlink) { + printk ("ext3_free_inode: inode has nlink=%d\n", + inode->i_nlink); + return; + } + if (!sb) { + printk("ext3_free_inode: inode on nonexistent device\n"); + return; + } + sbi = EXT3_SB(sb); + + ino = inode->i_ino; + ext3_debug ("freeing inode %lu\n", ino); + trace_ext3_free_inode(inode); + + is_directory = S_ISDIR(inode->i_mode); + + es = EXT3_SB(sb)->s_es; + if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { + ext3_error (sb, "ext3_free_inode", + "reserved or nonexistent inode %lu", ino); + goto error_return; + } + block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb); + bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb); + bitmap_bh = read_inode_bitmap(sb, block_group); + if (!bitmap_bh) + goto error_return; + + BUFFER_TRACE(bitmap_bh, "get_write_access"); + fatal = ext3_journal_get_write_access(handle, bitmap_bh); + if (fatal) + goto error_return; + + /* Ok, now we can actually update the inode bitmaps.. */ + if (!ext3_clear_bit_atomic(sb_bgl_lock(sbi, block_group), + bit, bitmap_bh->b_data)) + ext3_error (sb, "ext3_free_inode", + "bit already cleared for inode %lu", ino); + else { + gdp = ext3_get_group_desc (sb, block_group, &bh2); + + BUFFER_TRACE(bh2, "get_write_access"); + fatal = ext3_journal_get_write_access(handle, bh2); + if (fatal) goto error_return; + + if (gdp) { + spin_lock(sb_bgl_lock(sbi, block_group)); + le16_add_cpu(&gdp->bg_free_inodes_count, 1); + if (is_directory) + le16_add_cpu(&gdp->bg_used_dirs_count, -1); + spin_unlock(sb_bgl_lock(sbi, block_group)); + percpu_counter_inc(&sbi->s_freeinodes_counter); + if (is_directory) + percpu_counter_dec(&sbi->s_dirs_counter); + + } + BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata"); + err = ext3_journal_dirty_metadata(handle, bh2); + if (!fatal) fatal = err; + } + BUFFER_TRACE(bitmap_bh, "call ext3_journal_dirty_metadata"); + err = ext3_journal_dirty_metadata(handle, bitmap_bh); + if (!fatal) + fatal = err; + +error_return: + brelse(bitmap_bh); + ext3_std_error(sb, fatal); +} + +/* + * Orlov's allocator for directories. + * + * We always try to spread first-level directories. + * + * If there are blockgroups with both free inodes and free blocks counts + * not worse than average we return one with smallest directory count. + * Otherwise we simply return a random group. + * + * For the rest rules look so: + * + * It's OK to put directory into a group unless + * it has too many directories already (max_dirs) or + * it has too few free inodes left (min_inodes) or + * it has too few free blocks left (min_blocks). + * Parent's group is preferred, if it doesn't satisfy these + * conditions we search cyclically through the rest. If none + * of the groups look good we just look for a group with more + * free inodes than average (starting at parent's group). + * + * Debt is incremented each time we allocate a directory and decremented + * when we allocate an inode, within 0--255. + */ + +static int find_group_orlov(struct super_block *sb, struct inode *parent) +{ + int parent_group = EXT3_I(parent)->i_block_group; + struct ext3_sb_info *sbi = EXT3_SB(sb); + int ngroups = sbi->s_groups_count; + int inodes_per_group = EXT3_INODES_PER_GROUP(sb); + unsigned int freei, avefreei; + ext3_fsblk_t freeb, avefreeb; + unsigned int ndirs; + int max_dirs, min_inodes; + ext3_grpblk_t min_blocks; + int group = -1, i; + struct ext3_group_desc *desc; + + freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); + avefreei = freei / ngroups; + freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter); + avefreeb = freeb / ngroups; + ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); + + if ((parent == d_inode(sb->s_root)) || + (EXT3_I(parent)->i_flags & EXT3_TOPDIR_FL)) { + int best_ndir = inodes_per_group; + int best_group = -1; + + group = prandom_u32(); + parent_group = (unsigned)group % ngroups; + for (i = 0; i < ngroups; i++) { + group = (parent_group + i) % ngroups; + desc = ext3_get_group_desc (sb, group, NULL); + if (!desc || !desc->bg_free_inodes_count) + continue; + if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir) + continue; + if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei) + continue; + if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb) + continue; + best_group = group; + best_ndir = le16_to_cpu(desc->bg_used_dirs_count); + } + if (best_group >= 0) + return best_group; + goto fallback; + } + + max_dirs = ndirs / ngroups + inodes_per_group / 16; + min_inodes = avefreei - inodes_per_group / 4; + min_blocks = avefreeb - EXT3_BLOCKS_PER_GROUP(sb) / 4; + + for (i = 0; i < ngroups; i++) { + group = (parent_group + i) % ngroups; + desc = ext3_get_group_desc (sb, group, NULL); + if (!desc || !desc->bg_free_inodes_count) + continue; + if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs) + continue; + if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes) + continue; + if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks) + continue; + return group; + } + +fallback: + for (i = 0; i < ngroups; i++) { + group = (parent_group + i) % ngroups; + desc = ext3_get_group_desc (sb, group, NULL); + if (!desc || !desc->bg_free_inodes_count) + continue; + if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei) + return group; + } + + if (avefreei) { + /* + * The free-inodes counter is approximate, and for really small + * filesystems the above test can fail to find any blockgroups + */ + avefreei = 0; + goto fallback; + } + + return -1; +} + +static int find_group_other(struct super_block *sb, struct inode *parent) +{ + int parent_group = EXT3_I(parent)->i_block_group; + int ngroups = EXT3_SB(sb)->s_groups_count; + struct ext3_group_desc *desc; + int group, i; + + /* + * Try to place the inode in its parent directory + */ + group = parent_group; + desc = ext3_get_group_desc (sb, group, NULL); + if (desc && le16_to_cpu(desc->bg_free_inodes_count) && + le16_to_cpu(desc->bg_free_blocks_count)) + return group; + + /* + * We're going to place this inode in a different blockgroup from its + * parent. We want to cause files in a common directory to all land in + * the same blockgroup. But we want files which are in a different + * directory which shares a blockgroup with our parent to land in a + * different blockgroup. + * + * So add our directory's i_ino into the starting point for the hash. + */ + group = (group + parent->i_ino) % ngroups; + + /* + * Use a quadratic hash to find a group with a free inode and some free + * blocks. + */ + for (i = 1; i < ngroups; i <<= 1) { + group += i; + if (group >= ngroups) + group -= ngroups; + desc = ext3_get_group_desc (sb, group, NULL); + if (desc && le16_to_cpu(desc->bg_free_inodes_count) && + le16_to_cpu(desc->bg_free_blocks_count)) + return group; + } + + /* + * That failed: try linear search for a free inode, even if that group + * has no free blocks. + */ + group = parent_group; + for (i = 0; i < ngroups; i++) { + if (++group >= ngroups) + group = 0; + desc = ext3_get_group_desc (sb, group, NULL); + if (desc && le16_to_cpu(desc->bg_free_inodes_count)) + return group; + } + + return -1; +} + +/* + * There are two policies for allocating an inode. If the new inode is + * a directory, then a forward search is made for a block group with both + * free space and a low directory-to-inode ratio; if that fails, then of + * the groups with above-average free space, that group with the fewest + * directories already is chosen. + * + * For other inodes, search forward from the parent directory's block + * group to find a free inode. + */ +struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, + const struct qstr *qstr, umode_t mode) +{ + struct super_block *sb; + struct buffer_head *bitmap_bh = NULL; + struct buffer_head *bh2; + int group; + unsigned long ino = 0; + struct inode * inode; + struct ext3_group_desc * gdp = NULL; + struct ext3_super_block * es; + struct ext3_inode_info *ei; + struct ext3_sb_info *sbi; + int err = 0; + struct inode *ret; + int i; + + /* Cannot create files in a deleted directory */ + if (!dir || !dir->i_nlink) + return ERR_PTR(-EPERM); + + sb = dir->i_sb; + trace_ext3_request_inode(dir, mode); + inode = new_inode(sb); + if (!inode) + return ERR_PTR(-ENOMEM); + ei = EXT3_I(inode); + + sbi = EXT3_SB(sb); + es = sbi->s_es; + if (S_ISDIR(mode)) + group = find_group_orlov(sb, dir); + else + group = find_group_other(sb, dir); + + err = -ENOSPC; + if (group == -1) + goto out; + + for (i = 0; i < sbi->s_groups_count; i++) { + err = -EIO; + + gdp = ext3_get_group_desc(sb, group, &bh2); + if (!gdp) + goto fail; + + brelse(bitmap_bh); + bitmap_bh = read_inode_bitmap(sb, group); + if (!bitmap_bh) + goto fail; + + ino = 0; + +repeat_in_this_group: + ino = ext3_find_next_zero_bit((unsigned long *) + bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino); + if (ino < EXT3_INODES_PER_GROUP(sb)) { + + BUFFER_TRACE(bitmap_bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, bitmap_bh); + if (err) + goto fail; + + if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group), + ino, bitmap_bh->b_data)) { + /* we won it */ + BUFFER_TRACE(bitmap_bh, + "call ext3_journal_dirty_metadata"); + err = ext3_journal_dirty_metadata(handle, + bitmap_bh); + if (err) + goto fail; + goto got; + } + /* we lost it */ + journal_release_buffer(handle, bitmap_bh); + + if (++ino < EXT3_INODES_PER_GROUP(sb)) + goto repeat_in_this_group; + } + + /* + * This case is possible in concurrent environment. It is very + * rare. We cannot repeat the find_group_xxx() call because + * that will simply return the same blockgroup, because the + * group descriptor metadata has not yet been updated. + * So we just go onto the next blockgroup. + */ + if (++group == sbi->s_groups_count) + group = 0; + } + err = -ENOSPC; + goto out; + +got: + ino += group * EXT3_INODES_PER_GROUP(sb) + 1; + if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { + ext3_error (sb, "ext3_new_inode", + "reserved inode or inode > inodes count - " + "block_group = %d, inode=%lu", group, ino); + err = -EIO; + goto fail; + } + + BUFFER_TRACE(bh2, "get_write_access"); + err = ext3_journal_get_write_access(handle, bh2); + if (err) goto fail; + spin_lock(sb_bgl_lock(sbi, group)); + le16_add_cpu(&gdp->bg_free_inodes_count, -1); + if (S_ISDIR(mode)) { + le16_add_cpu(&gdp->bg_used_dirs_count, 1); + } + spin_unlock(sb_bgl_lock(sbi, group)); + BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata"); + err = ext3_journal_dirty_metadata(handle, bh2); + if (err) goto fail; + + percpu_counter_dec(&sbi->s_freeinodes_counter); + if (S_ISDIR(mode)) + percpu_counter_inc(&sbi->s_dirs_counter); + + + if (test_opt(sb, GRPID)) { + inode->i_mode = mode; + inode->i_uid = current_fsuid(); + inode->i_gid = dir->i_gid; + } else + inode_init_owner(inode, dir, mode); + + inode->i_ino = ino; + /* This is the optimal IO size (for stat), not the fs block size */ + inode->i_blocks = 0; + inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; + + memset(ei->i_data, 0, sizeof(ei->i_data)); + ei->i_dir_start_lookup = 0; + ei->i_disksize = 0; + + ei->i_flags = + ext3_mask_flags(mode, EXT3_I(dir)->i_flags & EXT3_FL_INHERITED); +#ifdef EXT3_FRAGMENTS + ei->i_faddr = 0; + ei->i_frag_no = 0; + ei->i_frag_size = 0; +#endif + ei->i_file_acl = 0; + ei->i_dir_acl = 0; + ei->i_dtime = 0; + ei->i_block_alloc_info = NULL; + ei->i_block_group = group; + + ext3_set_inode_flags(inode); + if (IS_DIRSYNC(inode)) + handle->h_sync = 1; + if (insert_inode_locked(inode) < 0) { + /* + * Likely a bitmap corruption causing inode to be allocated + * twice. + */ + err = -EIO; + goto fail; + } + spin_lock(&sbi->s_next_gen_lock); + inode->i_generation = sbi->s_next_generation++; + spin_unlock(&sbi->s_next_gen_lock); + + ei->i_state_flags = 0; + ext3_set_inode_state(inode, EXT3_STATE_NEW); + + /* See comment in ext3_iget for explanation */ + if (ino >= EXT3_FIRST_INO(sb) + 1 && + EXT3_INODE_SIZE(sb) > EXT3_GOOD_OLD_INODE_SIZE) { + ei->i_extra_isize = + sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE; + } else { + ei->i_extra_isize = 0; + } + + ret = inode; + dquot_initialize(inode); + err = dquot_alloc_inode(inode); + if (err) + goto fail_drop; + + err = ext3_init_acl(handle, inode, dir); + if (err) + goto fail_free_drop; + + err = ext3_init_security(handle, inode, dir, qstr); + if (err) + goto fail_free_drop; + + err = ext3_mark_inode_dirty(handle, inode); + if (err) { + ext3_std_error(sb, err); + goto fail_free_drop; + } + + ext3_debug("allocating inode %lu\n", inode->i_ino); + trace_ext3_allocate_inode(inode, dir, mode); + goto really_out; +fail: + ext3_std_error(sb, err); +out: + iput(inode); + ret = ERR_PTR(err); +really_out: + brelse(bitmap_bh); + return ret; + +fail_free_drop: + dquot_free_inode(inode); + +fail_drop: + dquot_drop(inode); + inode->i_flags |= S_NOQUOTA; + clear_nlink(inode); + unlock_new_inode(inode); + iput(inode); + brelse(bitmap_bh); + return ERR_PTR(err); +} + +/* Verify that we are loading a valid orphan from disk */ +struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino) +{ + unsigned long max_ino = le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count); + unsigned long block_group; + int bit; + struct buffer_head *bitmap_bh; + struct inode *inode = NULL; + long err = -EIO; + + /* Error cases - e2fsck has already cleaned up for us */ + if (ino > max_ino) { + ext3_warning(sb, __func__, + "bad orphan ino %lu! e2fsck was run?", ino); + goto error; + } + + block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb); + bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb); + bitmap_bh = read_inode_bitmap(sb, block_group); + if (!bitmap_bh) { + ext3_warning(sb, __func__, + "inode bitmap error for orphan %lu", ino); + goto error; + } + + /* Having the inode bit set should be a 100% indicator that this + * is a valid orphan (no e2fsck run on fs). Orphans also include + * inodes that were being truncated, so we can't check i_nlink==0. + */ + if (!ext3_test_bit(bit, bitmap_bh->b_data)) + goto bad_orphan; + + inode = ext3_iget(sb, ino); + if (IS_ERR(inode)) + goto iget_failed; + + /* + * If the orphans has i_nlinks > 0 then it should be able to be + * truncated, otherwise it won't be removed from the orphan list + * during processing and an infinite loop will result. + */ + if (inode->i_nlink && !ext3_can_truncate(inode)) + goto bad_orphan; + + if (NEXT_ORPHAN(inode) > max_ino) + goto bad_orphan; + brelse(bitmap_bh); + return inode; + +iget_failed: + err = PTR_ERR(inode); + inode = NULL; +bad_orphan: + ext3_warning(sb, __func__, + "bad orphan inode %lu! e2fsck was run?", ino); + printk(KERN_NOTICE "ext3_test_bit(bit=%d, block=%llu) = %d\n", + bit, (unsigned long long)bitmap_bh->b_blocknr, + ext3_test_bit(bit, bitmap_bh->b_data)); + printk(KERN_NOTICE "inode=%p\n", inode); + if (inode) { + printk(KERN_NOTICE "is_bad_inode(inode)=%d\n", + is_bad_inode(inode)); + printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n", + NEXT_ORPHAN(inode)); + printk(KERN_NOTICE "max_ino=%lu\n", max_ino); + printk(KERN_NOTICE "i_nlink=%u\n", inode->i_nlink); + /* Avoid freeing blocks if we got a bad deleted inode */ + if (inode->i_nlink == 0) + inode->i_blocks = 0; + iput(inode); + } + brelse(bitmap_bh); +error: + return ERR_PTR(err); +} + +unsigned long ext3_count_free_inodes (struct super_block * sb) +{ + unsigned long desc_count; + struct ext3_group_desc *gdp; + int i; +#ifdef EXT3FS_DEBUG + struct ext3_super_block *es; + unsigned long bitmap_count, x; + struct buffer_head *bitmap_bh = NULL; + + es = EXT3_SB(sb)->s_es; + desc_count = 0; + bitmap_count = 0; + gdp = NULL; + for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) { + gdp = ext3_get_group_desc (sb, i, NULL); + if (!gdp) + continue; + desc_count += le16_to_cpu(gdp->bg_free_inodes_count); + brelse(bitmap_bh); + bitmap_bh = read_inode_bitmap(sb, i); + if (!bitmap_bh) + continue; + + x = ext3_count_free(bitmap_bh, EXT3_INODES_PER_GROUP(sb) / 8); + printk("group %d: stored = %d, counted = %lu\n", + i, le16_to_cpu(gdp->bg_free_inodes_count), x); + bitmap_count += x; + } + brelse(bitmap_bh); + printk("ext3_count_free_inodes: stored = %u, computed = %lu, %lu\n", + le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); + return desc_count; +#else + desc_count = 0; + for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) { + gdp = ext3_get_group_desc (sb, i, NULL); + if (!gdp) + continue; + desc_count += le16_to_cpu(gdp->bg_free_inodes_count); + cond_resched(); + } + return desc_count; +#endif +} + +/* Called at mount-time, super-block is locked */ +unsigned long ext3_count_dirs (struct super_block * sb) +{ + unsigned long count = 0; + int i; + + for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) { + struct ext3_group_desc *gdp = ext3_get_group_desc (sb, i, NULL); + if (!gdp) + continue; + count += le16_to_cpu(gdp->bg_used_dirs_count); + } + return count; +} + diff --git a/kernel/fs/ext3/inode.c b/kernel/fs/ext3/inode.c new file mode 100644 index 000000000..2ee2dc435 --- /dev/null +++ b/kernel/fs/ext3/inode.c @@ -0,0 +1,3573 @@ +/* + * linux/fs/ext3/inode.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/inode.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * Goal-directed block allocation by Stephen Tweedie + * (sct@redhat.com), 1993, 1998 + * Big-endian to little-endian byte-swapping/bitmaps by + * David S. Miller (davem@caip.rutgers.edu), 1995 + * 64-bit file support on 64-bit platforms by Jakub Jelinek + * (jj@sunsite.ms.mff.cuni.cz) + * + * Assorted race fixes, rewrite of ext3_get_block() by Al Viro, 2000 + */ + +#include +#include +#include +#include +#include +#include +#include "ext3.h" +#include "xattr.h" +#include "acl.h" + +static int ext3_writepage_trans_blocks(struct inode *inode); +static int ext3_block_truncate_page(struct inode *inode, loff_t from); + +/* + * Test whether an inode is a fast symlink. + */ +static int ext3_inode_is_fast_symlink(struct inode *inode) +{ + int ea_blocks = EXT3_I(inode)->i_file_acl ? + (inode->i_sb->s_blocksize >> 9) : 0; + + return (S_ISLNK(inode->i_mode) && inode->i_blocks - ea_blocks == 0); +} + +/* + * The ext3 forget function must perform a revoke if we are freeing data + * which has been journaled. Metadata (eg. indirect blocks) must be + * revoked in all cases. + * + * "bh" may be NULL: a metadata block may have been freed from memory + * but there may still be a record of it in the journal, and that record + * still needs to be revoked. + */ +int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode, + struct buffer_head *bh, ext3_fsblk_t blocknr) +{ + int err; + + might_sleep(); + + trace_ext3_forget(inode, is_metadata, blocknr); + BUFFER_TRACE(bh, "enter"); + + jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, " + "data mode %lx\n", + bh, is_metadata, inode->i_mode, + test_opt(inode->i_sb, DATA_FLAGS)); + + /* Never use the revoke function if we are doing full data + * journaling: there is no need to, and a V1 superblock won't + * support it. Otherwise, only skip the revoke on un-journaled + * data blocks. */ + + if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA || + (!is_metadata && !ext3_should_journal_data(inode))) { + if (bh) { + BUFFER_TRACE(bh, "call journal_forget"); + return ext3_journal_forget(handle, bh); + } + return 0; + } + + /* + * data!=journal && (is_metadata || should_journal_data(inode)) + */ + BUFFER_TRACE(bh, "call ext3_journal_revoke"); + err = ext3_journal_revoke(handle, blocknr, bh); + if (err) + ext3_abort(inode->i_sb, __func__, + "error %d when attempting revoke", err); + BUFFER_TRACE(bh, "exit"); + return err; +} + +/* + * Work out how many blocks we need to proceed with the next chunk of a + * truncate transaction. + */ +static unsigned long blocks_for_truncate(struct inode *inode) +{ + unsigned long needed; + + needed = inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9); + + /* Give ourselves just enough room to cope with inodes in which + * i_blocks is corrupt: we've seen disk corruptions in the past + * which resulted in random data in an inode which looked enough + * like a regular file for ext3 to try to delete it. Things + * will go a bit crazy if that happens, but at least we should + * try not to panic the whole kernel. */ + if (needed < 2) + needed = 2; + + /* But we need to bound the transaction so we don't overflow the + * journal. */ + if (needed > EXT3_MAX_TRANS_DATA) + needed = EXT3_MAX_TRANS_DATA; + + return EXT3_DATA_TRANS_BLOCKS(inode->i_sb) + needed; +} + +/* + * Truncate transactions can be complex and absolutely huge. So we need to + * be able to restart the transaction at a conventient checkpoint to make + * sure we don't overflow the journal. + * + * start_transaction gets us a new handle for a truncate transaction, + * and extend_transaction tries to extend the existing one a bit. If + * extend fails, we need to propagate the failure up and restart the + * transaction in the top-level truncate loop. --sct + */ +static handle_t *start_transaction(struct inode *inode) +{ + handle_t *result; + + result = ext3_journal_start(inode, blocks_for_truncate(inode)); + if (!IS_ERR(result)) + return result; + + ext3_std_error(inode->i_sb, PTR_ERR(result)); + return result; +} + +/* + * Try to extend this transaction for the purposes of truncation. + * + * Returns 0 if we managed to create more room. If we can't create more + * room, and the transaction must be restarted we return 1. + */ +static int try_to_extend_transaction(handle_t *handle, struct inode *inode) +{ + if (handle->h_buffer_credits > EXT3_RESERVE_TRANS_BLOCKS) + return 0; + if (!ext3_journal_extend(handle, blocks_for_truncate(inode))) + return 0; + return 1; +} + +/* + * Restart the transaction associated with *handle. This does a commit, + * so before we call here everything must be consistently dirtied against + * this transaction. + */ +static int truncate_restart_transaction(handle_t *handle, struct inode *inode) +{ + int ret; + + jbd_debug(2, "restarting handle %p\n", handle); + /* + * Drop truncate_mutex to avoid deadlock with ext3_get_blocks_handle + * At this moment, get_block can be called only for blocks inside + * i_size since page cache has been already dropped and writes are + * blocked by i_mutex. So we can safely drop the truncate_mutex. + */ + mutex_unlock(&EXT3_I(inode)->truncate_mutex); + ret = ext3_journal_restart(handle, blocks_for_truncate(inode)); + mutex_lock(&EXT3_I(inode)->truncate_mutex); + return ret; +} + +/* + * Called at inode eviction from icache + */ +void ext3_evict_inode (struct inode *inode) +{ + struct ext3_inode_info *ei = EXT3_I(inode); + struct ext3_block_alloc_info *rsv; + handle_t *handle; + int want_delete = 0; + + trace_ext3_evict_inode(inode); + if (!inode->i_nlink && !is_bad_inode(inode)) { + dquot_initialize(inode); + want_delete = 1; + } + + /* + * When journalling data dirty buffers are tracked only in the journal. + * So although mm thinks everything is clean and ready for reaping the + * inode might still have some pages to write in the running + * transaction or waiting to be checkpointed. Thus calling + * journal_invalidatepage() (via truncate_inode_pages()) to discard + * these buffers can cause data loss. Also even if we did not discard + * these buffers, we would have no way to find them after the inode + * is reaped and thus user could see stale data if he tries to read + * them before the transaction is checkpointed. So be careful and + * force everything to disk here... We use ei->i_datasync_tid to + * store the newest transaction containing inode's data. + * + * Note that directories do not have this problem because they don't + * use page cache. + * + * The s_journal check handles the case when ext3_get_journal() fails + * and puts the journal inode. + */ + if (inode->i_nlink && ext3_should_journal_data(inode) && + EXT3_SB(inode->i_sb)->s_journal && + (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode)) && + inode->i_ino != EXT3_JOURNAL_INO) { + tid_t commit_tid = atomic_read(&ei->i_datasync_tid); + journal_t *journal = EXT3_SB(inode->i_sb)->s_journal; + + log_start_commit(journal, commit_tid); + log_wait_commit(journal, commit_tid); + filemap_write_and_wait(&inode->i_data); + } + truncate_inode_pages_final(&inode->i_data); + + ext3_discard_reservation(inode); + rsv = ei->i_block_alloc_info; + ei->i_block_alloc_info = NULL; + if (unlikely(rsv)) + kfree(rsv); + + if (!want_delete) + goto no_delete; + + handle = start_transaction(inode); + if (IS_ERR(handle)) { + /* + * If we're going to skip the normal cleanup, we still need to + * make sure that the in-core orphan linked list is properly + * cleaned up. + */ + ext3_orphan_del(NULL, inode); + goto no_delete; + } + + if (IS_SYNC(inode)) + handle->h_sync = 1; + inode->i_size = 0; + if (inode->i_blocks) + ext3_truncate(inode); + /* + * Kill off the orphan record created when the inode lost the last + * link. Note that ext3_orphan_del() has to be able to cope with the + * deletion of a non-existent orphan - ext3_truncate() could + * have removed the record. + */ + ext3_orphan_del(handle, inode); + ei->i_dtime = get_seconds(); + + /* + * One subtle ordering requirement: if anything has gone wrong + * (transaction abort, IO errors, whatever), then we can still + * do these next steps (the fs will already have been marked as + * having errors), but we can't free the inode if the mark_dirty + * fails. + */ + if (ext3_mark_inode_dirty(handle, inode)) { + /* If that failed, just dquot_drop() and be done with that */ + dquot_drop(inode); + clear_inode(inode); + } else { + ext3_xattr_delete_inode(handle, inode); + dquot_free_inode(inode); + dquot_drop(inode); + clear_inode(inode); + ext3_free_inode(handle, inode); + } + ext3_journal_stop(handle); + return; +no_delete: + clear_inode(inode); + dquot_drop(inode); +} + +typedef struct { + __le32 *p; + __le32 key; + struct buffer_head *bh; +} Indirect; + +static inline void add_chain(Indirect *p, struct buffer_head *bh, __le32 *v) +{ + p->key = *(p->p = v); + p->bh = bh; +} + +static int verify_chain(Indirect *from, Indirect *to) +{ + while (from <= to && from->key == *from->p) + from++; + return (from > to); +} + +/** + * ext3_block_to_path - parse the block number into array of offsets + * @inode: inode in question (we are only interested in its superblock) + * @i_block: block number to be parsed + * @offsets: array to store the offsets in + * @boundary: set this non-zero if the referred-to block is likely to be + * followed (on disk) by an indirect block. + * + * To store the locations of file's data ext3 uses a data structure common + * for UNIX filesystems - tree of pointers anchored in the inode, with + * data blocks at leaves and indirect blocks in intermediate nodes. + * This function translates the block number into path in that tree - + * return value is the path length and @offsets[n] is the offset of + * pointer to (n+1)th node in the nth one. If @block is out of range + * (negative or too large) warning is printed and zero returned. + * + * Note: function doesn't find node addresses, so no IO is needed. All + * we need to know is the capacity of indirect blocks (taken from the + * inode->i_sb). + */ + +/* + * Portability note: the last comparison (check that we fit into triple + * indirect block) is spelled differently, because otherwise on an + * architecture with 32-bit longs and 8Kb pages we might get into trouble + * if our filesystem had 8Kb blocks. We might use long long, but that would + * kill us on x86. Oh, well, at least the sign propagation does not matter - + * i_block would have to be negative in the very beginning, so we would not + * get there at all. + */ + +static int ext3_block_to_path(struct inode *inode, + long i_block, int offsets[4], int *boundary) +{ + int ptrs = EXT3_ADDR_PER_BLOCK(inode->i_sb); + int ptrs_bits = EXT3_ADDR_PER_BLOCK_BITS(inode->i_sb); + const long direct_blocks = EXT3_NDIR_BLOCKS, + indirect_blocks = ptrs, + double_blocks = (1 << (ptrs_bits * 2)); + int n = 0; + int final = 0; + + if (i_block < 0) { + ext3_warning (inode->i_sb, "ext3_block_to_path", "block < 0"); + } else if (i_block < direct_blocks) { + offsets[n++] = i_block; + final = direct_blocks; + } else if ( (i_block -= direct_blocks) < indirect_blocks) { + offsets[n++] = EXT3_IND_BLOCK; + offsets[n++] = i_block; + final = ptrs; + } else if ((i_block -= indirect_blocks) < double_blocks) { + offsets[n++] = EXT3_DIND_BLOCK; + offsets[n++] = i_block >> ptrs_bits; + offsets[n++] = i_block & (ptrs - 1); + final = ptrs; + } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) { + offsets[n++] = EXT3_TIND_BLOCK; + offsets[n++] = i_block >> (ptrs_bits * 2); + offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1); + offsets[n++] = i_block & (ptrs - 1); + final = ptrs; + } else { + ext3_warning(inode->i_sb, "ext3_block_to_path", "block > big"); + } + if (boundary) + *boundary = final - 1 - (i_block & (ptrs - 1)); + return n; +} + +/** + * ext3_get_branch - read the chain of indirect blocks leading to data + * @inode: inode in question + * @depth: depth of the chain (1 - direct pointer, etc.) + * @offsets: offsets of pointers in inode/indirect blocks + * @chain: place to store the result + * @err: here we store the error value + * + * Function fills the array of triples and returns %NULL + * if everything went OK or the pointer to the last filled triple + * (incomplete one) otherwise. Upon the return chain[i].key contains + * the number of (i+1)-th block in the chain (as it is stored in memory, + * i.e. little-endian 32-bit), chain[i].p contains the address of that + * number (it points into struct inode for i==0 and into the bh->b_data + * for i>0) and chain[i].bh points to the buffer_head of i-th indirect + * block for i>0 and NULL for i==0. In other words, it holds the block + * numbers of the chain, addresses they were taken from (and where we can + * verify that chain did not change) and buffer_heads hosting these + * numbers. + * + * Function stops when it stumbles upon zero pointer (absent block) + * (pointer to last triple returned, *@err == 0) + * or when it gets an IO error reading an indirect block + * (ditto, *@err == -EIO) + * or when it notices that chain had been changed while it was reading + * (ditto, *@err == -EAGAIN) + * or when it reads all @depth-1 indirect blocks successfully and finds + * the whole chain, all way to the data (returns %NULL, *err == 0). + */ +static Indirect *ext3_get_branch(struct inode *inode, int depth, int *offsets, + Indirect chain[4], int *err) +{ + struct super_block *sb = inode->i_sb; + Indirect *p = chain; + struct buffer_head *bh; + + *err = 0; + /* i_data is not going away, no lock needed */ + add_chain (chain, NULL, EXT3_I(inode)->i_data + *offsets); + if (!p->key) + goto no_block; + while (--depth) { + bh = sb_bread(sb, le32_to_cpu(p->key)); + if (!bh) + goto failure; + /* Reader: pointers */ + if (!verify_chain(chain, p)) + goto changed; + add_chain(++p, bh, (__le32*)bh->b_data + *++offsets); + /* Reader: end */ + if (!p->key) + goto no_block; + } + return NULL; + +changed: + brelse(bh); + *err = -EAGAIN; + goto no_block; +failure: + *err = -EIO; +no_block: + return p; +} + +/** + * ext3_find_near - find a place for allocation with sufficient locality + * @inode: owner + * @ind: descriptor of indirect block. + * + * This function returns the preferred place for block allocation. + * It is used when heuristic for sequential allocation fails. + * Rules are: + * + if there is a block to the left of our position - allocate near it. + * + if pointer will live in indirect block - allocate near that block. + * + if pointer will live in inode - allocate in the same + * cylinder group. + * + * In the latter case we colour the starting block by the callers PID to + * prevent it from clashing with concurrent allocations for a different inode + * in the same block group. The PID is used here so that functionally related + * files will be close-by on-disk. + * + * Caller must make sure that @ind is valid and will stay that way. + */ +static ext3_fsblk_t ext3_find_near(struct inode *inode, Indirect *ind) +{ + struct ext3_inode_info *ei = EXT3_I(inode); + __le32 *start = ind->bh ? (__le32*) ind->bh->b_data : ei->i_data; + __le32 *p; + ext3_fsblk_t bg_start; + ext3_grpblk_t colour; + + /* Try to find previous block */ + for (p = ind->p - 1; p >= start; p--) { + if (*p) + return le32_to_cpu(*p); + } + + /* No such thing, so let's try location of indirect block */ + if (ind->bh) + return ind->bh->b_blocknr; + + /* + * It is going to be referred to from the inode itself? OK, just put it + * into the same cylinder group then. + */ + bg_start = ext3_group_first_block_no(inode->i_sb, ei->i_block_group); + colour = (current->pid % 16) * + (EXT3_BLOCKS_PER_GROUP(inode->i_sb) / 16); + return bg_start + colour; +} + +/** + * ext3_find_goal - find a preferred place for allocation. + * @inode: owner + * @block: block we want + * @partial: pointer to the last triple within a chain + * + * Normally this function find the preferred place for block allocation, + * returns it. + */ + +static ext3_fsblk_t ext3_find_goal(struct inode *inode, long block, + Indirect *partial) +{ + struct ext3_block_alloc_info *block_i; + + block_i = EXT3_I(inode)->i_block_alloc_info; + + /* + * try the heuristic for sequential allocation, + * failing that at least try to get decent locality. + */ + if (block_i && (block == block_i->last_alloc_logical_block + 1) + && (block_i->last_alloc_physical_block != 0)) { + return block_i->last_alloc_physical_block + 1; + } + + return ext3_find_near(inode, partial); +} + +/** + * ext3_blks_to_allocate - Look up the block map and count the number + * of direct blocks need to be allocated for the given branch. + * + * @branch: chain of indirect blocks + * @k: number of blocks need for indirect blocks + * @blks: number of data blocks to be mapped. + * @blocks_to_boundary: the offset in the indirect block + * + * return the total number of blocks to be allocate, including the + * direct and indirect blocks. + */ +static int ext3_blks_to_allocate(Indirect *branch, int k, unsigned long blks, + int blocks_to_boundary) +{ + unsigned long count = 0; + + /* + * Simple case, [t,d]Indirect block(s) has not allocated yet + * then it's clear blocks on that path have not allocated + */ + if (k > 0) { + /* right now we don't handle cross boundary allocation */ + if (blks < blocks_to_boundary + 1) + count += blks; + else + count += blocks_to_boundary + 1; + return count; + } + + count++; + while (count < blks && count <= blocks_to_boundary && + le32_to_cpu(*(branch[0].p + count)) == 0) { + count++; + } + return count; +} + +/** + * ext3_alloc_blocks - multiple allocate blocks needed for a branch + * @handle: handle for this transaction + * @inode: owner + * @goal: preferred place for allocation + * @indirect_blks: the number of blocks need to allocate for indirect + * blocks + * @blks: number of blocks need to allocated for direct blocks + * @new_blocks: on return it will store the new block numbers for + * the indirect blocks(if needed) and the first direct block, + * @err: here we store the error value + * + * return the number of direct blocks allocated + */ +static int ext3_alloc_blocks(handle_t *handle, struct inode *inode, + ext3_fsblk_t goal, int indirect_blks, int blks, + ext3_fsblk_t new_blocks[4], int *err) +{ + int target, i; + unsigned long count = 0; + int index = 0; + ext3_fsblk_t current_block = 0; + int ret = 0; + + /* + * Here we try to allocate the requested multiple blocks at once, + * on a best-effort basis. + * To build a branch, we should allocate blocks for + * the indirect blocks(if not allocated yet), and at least + * the first direct block of this branch. That's the + * minimum number of blocks need to allocate(required) + */ + target = blks + indirect_blks; + + while (1) { + count = target; + /* allocating blocks for indirect blocks and direct blocks */ + current_block = ext3_new_blocks(handle,inode,goal,&count,err); + if (*err) + goto failed_out; + + target -= count; + /* allocate blocks for indirect blocks */ + while (index < indirect_blks && count) { + new_blocks[index++] = current_block++; + count--; + } + + if (count > 0) + break; + } + + /* save the new block number for the first direct block */ + new_blocks[index] = current_block; + + /* total number of blocks allocated for direct blocks */ + ret = count; + *err = 0; + return ret; +failed_out: + for (i = 0; i key). Upon the exit we have the same + * picture as after the successful ext3_get_block(), except that in one + * place chain is disconnected - *branch->p is still zero (we did not + * set the last link), but branch->key contains the number that should + * be placed into *branch->p to fill that gap. + * + * If allocation fails we free all blocks we've allocated (and forget + * their buffer_heads) and return the error value the from failed + * ext3_alloc_block() (normally -ENOSPC). Otherwise we set the chain + * as described above and return 0. + */ +static int ext3_alloc_branch(handle_t *handle, struct inode *inode, + int indirect_blks, int *blks, ext3_fsblk_t goal, + int *offsets, Indirect *branch) +{ + int blocksize = inode->i_sb->s_blocksize; + int i, n = 0; + int err = 0; + struct buffer_head *bh; + int num; + ext3_fsblk_t new_blocks[4]; + ext3_fsblk_t current_block; + + num = ext3_alloc_blocks(handle, inode, goal, indirect_blks, + *blks, new_blocks, &err); + if (err) + return err; + + branch[0].key = cpu_to_le32(new_blocks[0]); + /* + * metadata blocks and data blocks are allocated. + */ + for (n = 1; n <= indirect_blks; n++) { + /* + * Get buffer_head for parent block, zero it out + * and set the pointer to new one, then send + * parent to disk. + */ + bh = sb_getblk(inode->i_sb, new_blocks[n-1]); + if (unlikely(!bh)) { + err = -ENOMEM; + goto failed; + } + branch[n].bh = bh; + lock_buffer(bh); + BUFFER_TRACE(bh, "call get_create_access"); + err = ext3_journal_get_create_access(handle, bh); + if (err) { + unlock_buffer(bh); + brelse(bh); + goto failed; + } + + memset(bh->b_data, 0, blocksize); + branch[n].p = (__le32 *) bh->b_data + offsets[n]; + branch[n].key = cpu_to_le32(new_blocks[n]); + *branch[n].p = branch[n].key; + if ( n == indirect_blks) { + current_block = new_blocks[n]; + /* + * End of chain, update the last new metablock of + * the chain to point to the new allocated + * data blocks numbers + */ + for (i=1; i < num; i++) + *(branch[n].p + i) = cpu_to_le32(++current_block); + } + BUFFER_TRACE(bh, "marking uptodate"); + set_buffer_uptodate(bh); + unlock_buffer(bh); + + BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); + err = ext3_journal_dirty_metadata(handle, bh); + if (err) + goto failed; + } + *blks = num; + return err; +failed: + /* Allocation failed, free what we already allocated */ + for (i = 1; i <= n ; i++) { + BUFFER_TRACE(branch[i].bh, "call journal_forget"); + ext3_journal_forget(handle, branch[i].bh); + } + for (i = 0; i < indirect_blks; i++) + ext3_free_blocks(handle, inode, new_blocks[i], 1); + + ext3_free_blocks(handle, inode, new_blocks[i], num); + + return err; +} + +/** + * ext3_splice_branch - splice the allocated branch onto inode. + * @handle: handle for this transaction + * @inode: owner + * @block: (logical) number of block we are adding + * @where: location of missing link + * @num: number of indirect blocks we are adding + * @blks: number of direct blocks we are adding + * + * This function fills the missing link and does all housekeeping needed in + * inode (->i_blocks, etc.). In case of success we end up with the full + * chain to new block and return 0. + */ +static int ext3_splice_branch(handle_t *handle, struct inode *inode, + long block, Indirect *where, int num, int blks) +{ + int i; + int err = 0; + struct ext3_block_alloc_info *block_i; + ext3_fsblk_t current_block; + struct ext3_inode_info *ei = EXT3_I(inode); + struct timespec now; + + block_i = ei->i_block_alloc_info; + /* + * If we're splicing into a [td]indirect block (as opposed to the + * inode) then we need to get write access to the [td]indirect block + * before the splice. + */ + if (where->bh) { + BUFFER_TRACE(where->bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, where->bh); + if (err) + goto err_out; + } + /* That's it */ + + *where->p = where->key; + + /* + * Update the host buffer_head or inode to point to more just allocated + * direct blocks blocks + */ + if (num == 0 && blks > 1) { + current_block = le32_to_cpu(where->key) + 1; + for (i = 1; i < blks; i++) + *(where->p + i ) = cpu_to_le32(current_block++); + } + + /* + * update the most recently allocated logical & physical block + * in i_block_alloc_info, to assist find the proper goal block for next + * allocation + */ + if (block_i) { + block_i->last_alloc_logical_block = block + blks - 1; + block_i->last_alloc_physical_block = + le32_to_cpu(where[num].key) + blks - 1; + } + + /* We are done with atomic stuff, now do the rest of housekeeping */ + now = CURRENT_TIME_SEC; + if (!timespec_equal(&inode->i_ctime, &now) || !where->bh) { + inode->i_ctime = now; + ext3_mark_inode_dirty(handle, inode); + } + /* ext3_mark_inode_dirty already updated i_sync_tid */ + atomic_set(&ei->i_datasync_tid, handle->h_transaction->t_tid); + + /* had we spliced it onto indirect block? */ + if (where->bh) { + /* + * If we spliced it onto an indirect block, we haven't + * altered the inode. Note however that if it is being spliced + * onto an indirect block at the very end of the file (the + * file is growing) then we *will* alter the inode to reflect + * the new i_size. But that is not done here - it is done in + * generic_commit_write->__mark_inode_dirty->ext3_dirty_inode. + */ + jbd_debug(5, "splicing indirect only\n"); + BUFFER_TRACE(where->bh, "call ext3_journal_dirty_metadata"); + err = ext3_journal_dirty_metadata(handle, where->bh); + if (err) + goto err_out; + } else { + /* + * OK, we spliced it into the inode itself on a direct block. + * Inode was dirtied above. + */ + jbd_debug(5, "splicing direct\n"); + } + return err; + +err_out: + for (i = 1; i <= num; i++) { + BUFFER_TRACE(where[i].bh, "call journal_forget"); + ext3_journal_forget(handle, where[i].bh); + ext3_free_blocks(handle,inode,le32_to_cpu(where[i-1].key),1); + } + ext3_free_blocks(handle, inode, le32_to_cpu(where[num].key), blks); + + return err; +} + +/* + * Allocation strategy is simple: if we have to allocate something, we will + * have to go the whole way to leaf. So let's do it before attaching anything + * to tree, set linkage between the newborn blocks, write them if sync is + * required, recheck the path, free and repeat if check fails, otherwise + * set the last missing link (that will protect us from any truncate-generated + * removals - all blocks on the path are immune now) and possibly force the + * write on the parent block. + * That has a nice additional property: no special recovery from the failed + * allocations is needed - we simply release blocks and do not touch anything + * reachable from inode. + * + * `handle' can be NULL if create == 0. + * + * The BKL may not be held on entry here. Be sure to take it early. + * return > 0, # of blocks mapped or allocated. + * return = 0, if plain lookup failed. + * return < 0, error case. + */ +int ext3_get_blocks_handle(handle_t *handle, struct inode *inode, + sector_t iblock, unsigned long maxblocks, + struct buffer_head *bh_result, + int create) +{ + int err = -EIO; + int offsets[4]; + Indirect chain[4]; + Indirect *partial; + ext3_fsblk_t goal; + int indirect_blks; + int blocks_to_boundary = 0; + int depth; + struct ext3_inode_info *ei = EXT3_I(inode); + int count = 0; + ext3_fsblk_t first_block = 0; + + + trace_ext3_get_blocks_enter(inode, iblock, maxblocks, create); + J_ASSERT(handle != NULL || create == 0); + depth = ext3_block_to_path(inode,iblock,offsets,&blocks_to_boundary); + + if (depth == 0) + goto out; + + partial = ext3_get_branch(inode, depth, offsets, chain, &err); + + /* Simplest case - block found, no allocation needed */ + if (!partial) { + first_block = le32_to_cpu(chain[depth - 1].key); + clear_buffer_new(bh_result); + count++; + /*map more blocks*/ + while (count < maxblocks && count <= blocks_to_boundary) { + ext3_fsblk_t blk; + + if (!verify_chain(chain, chain + depth - 1)) { + /* + * Indirect block might be removed by + * truncate while we were reading it. + * Handling of that case: forget what we've + * got now. Flag the err as EAGAIN, so it + * will reread. + */ + err = -EAGAIN; + count = 0; + break; + } + blk = le32_to_cpu(*(chain[depth-1].p + count)); + + if (blk == first_block + count) + count++; + else + break; + } + if (err != -EAGAIN) + goto got_it; + } + + /* Next simple case - plain lookup or failed read of indirect block */ + if (!create || err == -EIO) + goto cleanup; + + /* + * Block out ext3_truncate while we alter the tree + */ + mutex_lock(&ei->truncate_mutex); + + /* + * If the indirect block is missing while we are reading + * the chain(ext3_get_branch() returns -EAGAIN err), or + * if the chain has been changed after we grab the semaphore, + * (either because another process truncated this branch, or + * another get_block allocated this branch) re-grab the chain to see if + * the request block has been allocated or not. + * + * Since we already block the truncate/other get_block + * at this point, we will have the current copy of the chain when we + * splice the branch into the tree. + */ + if (err == -EAGAIN || !verify_chain(chain, partial)) { + while (partial > chain) { + brelse(partial->bh); + partial--; + } + partial = ext3_get_branch(inode, depth, offsets, chain, &err); + if (!partial) { + count++; + mutex_unlock(&ei->truncate_mutex); + if (err) + goto cleanup; + clear_buffer_new(bh_result); + goto got_it; + } + } + + /* + * Okay, we need to do block allocation. Lazily initialize the block + * allocation info here if necessary + */ + if (S_ISREG(inode->i_mode) && (!ei->i_block_alloc_info)) + ext3_init_block_alloc_info(inode); + + goal = ext3_find_goal(inode, iblock, partial); + + /* the number of blocks need to allocate for [d,t]indirect blocks */ + indirect_blks = (chain + depth) - partial - 1; + + /* + * Next look up the indirect map to count the totoal number of + * direct blocks to allocate for this branch. + */ + count = ext3_blks_to_allocate(partial, indirect_blks, + maxblocks, blocks_to_boundary); + err = ext3_alloc_branch(handle, inode, indirect_blks, &count, goal, + offsets + (partial - chain), partial); + + /* + * The ext3_splice_branch call will free and forget any buffers + * on the new chain if there is a failure, but that risks using + * up transaction credits, especially for bitmaps where the + * credits cannot be returned. Can we handle this somehow? We + * may need to return -EAGAIN upwards in the worst case. --sct + */ + if (!err) + err = ext3_splice_branch(handle, inode, iblock, + partial, indirect_blks, count); + mutex_unlock(&ei->truncate_mutex); + if (err) + goto cleanup; + + set_buffer_new(bh_result); +got_it: + map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key)); + if (count > blocks_to_boundary) + set_buffer_boundary(bh_result); + err = count; + /* Clean up and exit */ + partial = chain + depth - 1; /* the whole chain */ +cleanup: + while (partial > chain) { + BUFFER_TRACE(partial->bh, "call brelse"); + brelse(partial->bh); + partial--; + } + BUFFER_TRACE(bh_result, "returned"); +out: + trace_ext3_get_blocks_exit(inode, iblock, + depth ? le32_to_cpu(chain[depth-1].key) : 0, + count, err); + return err; +} + +/* Maximum number of blocks we map for direct IO at once. */ +#define DIO_MAX_BLOCKS 4096 +/* + * Number of credits we need for writing DIO_MAX_BLOCKS: + * We need sb + group descriptor + bitmap + inode -> 4 + * For B blocks with A block pointers per block we need: + * 1 (triple ind.) + (B/A/A + 2) (doubly ind.) + (B/A + 2) (indirect). + * If we plug in 4096 for B and 256 for A (for 1KB block size), we get 25. + */ +#define DIO_CREDITS 25 + +static int ext3_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + handle_t *handle = ext3_journal_current_handle(); + int ret = 0, started = 0; + unsigned max_blocks = bh_result->b_size >> inode->i_blkbits; + + if (create && !handle) { /* Direct IO write... */ + if (max_blocks > DIO_MAX_BLOCKS) + max_blocks = DIO_MAX_BLOCKS; + handle = ext3_journal_start(inode, DIO_CREDITS + + EXT3_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb)); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + goto out; + } + started = 1; + } + + ret = ext3_get_blocks_handle(handle, inode, iblock, + max_blocks, bh_result, create); + if (ret > 0) { + bh_result->b_size = (ret << inode->i_blkbits); + ret = 0; + } + if (started) + ext3_journal_stop(handle); +out: + return ret; +} + +int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, + u64 start, u64 len) +{ + return generic_block_fiemap(inode, fieinfo, start, len, + ext3_get_block); +} + +/* + * `handle' can be NULL if create is zero + */ +struct buffer_head *ext3_getblk(handle_t *handle, struct inode *inode, + long block, int create, int *errp) +{ + struct buffer_head dummy; + int fatal = 0, err; + + J_ASSERT(handle != NULL || create == 0); + + dummy.b_state = 0; + dummy.b_blocknr = -1000; + buffer_trace_init(&dummy.b_history); + err = ext3_get_blocks_handle(handle, inode, block, 1, + &dummy, create); + /* + * ext3_get_blocks_handle() returns number of blocks + * mapped. 0 in case of a HOLE. + */ + if (err > 0) { + WARN_ON(err > 1); + err = 0; + } + *errp = err; + if (!err && buffer_mapped(&dummy)) { + struct buffer_head *bh; + bh = sb_getblk(inode->i_sb, dummy.b_blocknr); + if (unlikely(!bh)) { + *errp = -ENOMEM; + goto err; + } + if (buffer_new(&dummy)) { + J_ASSERT(create != 0); + J_ASSERT(handle != NULL); + + /* + * Now that we do not always journal data, we should + * keep in mind whether this should always journal the + * new buffer as metadata. For now, regular file + * writes use ext3_get_block instead, so it's not a + * problem. + */ + lock_buffer(bh); + BUFFER_TRACE(bh, "call get_create_access"); + fatal = ext3_journal_get_create_access(handle, bh); + if (!fatal && !buffer_uptodate(bh)) { + memset(bh->b_data,0,inode->i_sb->s_blocksize); + set_buffer_uptodate(bh); + } + unlock_buffer(bh); + BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); + err = ext3_journal_dirty_metadata(handle, bh); + if (!fatal) + fatal = err; + } else { + BUFFER_TRACE(bh, "not a new buffer"); + } + if (fatal) { + *errp = fatal; + brelse(bh); + bh = NULL; + } + return bh; + } +err: + return NULL; +} + +struct buffer_head *ext3_bread(handle_t *handle, struct inode *inode, + int block, int create, int *err) +{ + struct buffer_head * bh; + + bh = ext3_getblk(handle, inode, block, create, err); + if (!bh) + return bh; + if (bh_uptodate_or_lock(bh)) + return bh; + get_bh(bh); + bh->b_end_io = end_buffer_read_sync; + submit_bh(READ | REQ_META | REQ_PRIO, bh); + wait_on_buffer(bh); + if (buffer_uptodate(bh)) + return bh; + put_bh(bh); + *err = -EIO; + return NULL; +} + +static int walk_page_buffers( handle_t *handle, + struct buffer_head *head, + unsigned from, + unsigned to, + int *partial, + int (*fn)( handle_t *handle, + struct buffer_head *bh)) +{ + struct buffer_head *bh; + unsigned block_start, block_end; + unsigned blocksize = head->b_size; + int err, ret = 0; + struct buffer_head *next; + + for ( bh = head, block_start = 0; + ret == 0 && (bh != head || !block_start); + block_start = block_end, bh = next) + { + next = bh->b_this_page; + block_end = block_start + blocksize; + if (block_end <= from || block_start >= to) { + if (partial && !buffer_uptodate(bh)) + *partial = 1; + continue; + } + err = (*fn)(handle, bh); + if (!ret) + ret = err; + } + return ret; +} + +/* + * To preserve ordering, it is essential that the hole instantiation and + * the data write be encapsulated in a single transaction. We cannot + * close off a transaction and start a new one between the ext3_get_block() + * and the commit_write(). So doing the journal_start at the start of + * prepare_write() is the right place. + * + * Also, this function can nest inside ext3_writepage() -> + * block_write_full_page(). In that case, we *know* that ext3_writepage() + * has generated enough buffer credits to do the whole page. So we won't + * block on the journal in that case, which is good, because the caller may + * be PF_MEMALLOC. + * + * By accident, ext3 can be reentered when a transaction is open via + * quota file writes. If we were to commit the transaction while thus + * reentered, there can be a deadlock - we would be holding a quota + * lock, and the commit would never complete if another thread had a + * transaction open and was blocking on the quota lock - a ranking + * violation. + * + * So what we do is to rely on the fact that journal_stop/journal_start + * will _not_ run commit under these circumstances because handle->h_ref + * is elevated. We'll still have enough credits for the tiny quotafile + * write. + */ +static int do_journal_get_write_access(handle_t *handle, + struct buffer_head *bh) +{ + int dirty = buffer_dirty(bh); + int ret; + + if (!buffer_mapped(bh) || buffer_freed(bh)) + return 0; + /* + * __block_prepare_write() could have dirtied some buffers. Clean + * the dirty bit as jbd2_journal_get_write_access() could complain + * otherwise about fs integrity issues. Setting of the dirty bit + * by __block_prepare_write() isn't a real problem here as we clear + * the bit before releasing a page lock and thus writeback cannot + * ever write the buffer. + */ + if (dirty) + clear_buffer_dirty(bh); + ret = ext3_journal_get_write_access(handle, bh); + if (!ret && dirty) + ret = ext3_journal_dirty_metadata(handle, bh); + return ret; +} + +/* + * Truncate blocks that were not used by write. We have to truncate the + * pagecache as well so that corresponding buffers get properly unmapped. + */ +static void ext3_truncate_failed_write(struct inode *inode) +{ + truncate_inode_pages(inode->i_mapping, inode->i_size); + ext3_truncate(inode); +} + +/* + * Truncate blocks that were not used by direct IO write. We have to zero out + * the last file block as well because direct IO might have written to it. + */ +static void ext3_truncate_failed_direct_write(struct inode *inode) +{ + ext3_block_truncate_page(inode, inode->i_size); + ext3_truncate(inode); +} + +static int ext3_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) +{ + struct inode *inode = mapping->host; + int ret; + handle_t *handle; + int retries = 0; + struct page *page; + pgoff_t index; + unsigned from, to; + /* Reserve one block more for addition to orphan list in case + * we allocate blocks but write fails for some reason */ + int needed_blocks = ext3_writepage_trans_blocks(inode) + 1; + + trace_ext3_write_begin(inode, pos, len, flags); + + index = pos >> PAGE_CACHE_SHIFT; + from = pos & (PAGE_CACHE_SIZE - 1); + to = from + len; + +retry: + page = grab_cache_page_write_begin(mapping, index, flags); + if (!page) + return -ENOMEM; + *pagep = page; + + handle = ext3_journal_start(inode, needed_blocks); + if (IS_ERR(handle)) { + unlock_page(page); + page_cache_release(page); + ret = PTR_ERR(handle); + goto out; + } + ret = __block_write_begin(page, pos, len, ext3_get_block); + if (ret) + goto write_begin_failed; + + if (ext3_should_journal_data(inode)) { + ret = walk_page_buffers(handle, page_buffers(page), + from, to, NULL, do_journal_get_write_access); + } +write_begin_failed: + if (ret) { + /* + * block_write_begin may have instantiated a few blocks + * outside i_size. Trim these off again. Don't need + * i_size_read because we hold i_mutex. + * + * Add inode to orphan list in case we crash before truncate + * finishes. Do this only if ext3_can_truncate() agrees so + * that orphan processing code is happy. + */ + if (pos + len > inode->i_size && ext3_can_truncate(inode)) + ext3_orphan_add(handle, inode); + ext3_journal_stop(handle); + unlock_page(page); + page_cache_release(page); + if (pos + len > inode->i_size) + ext3_truncate_failed_write(inode); + } + if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries)) + goto retry; +out: + return ret; +} + + +int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh) +{ + int err = journal_dirty_data(handle, bh); + if (err) + ext3_journal_abort_handle(__func__, __func__, + bh, handle, err); + return err; +} + +/* For ordered writepage and write_end functions */ +static int journal_dirty_data_fn(handle_t *handle, struct buffer_head *bh) +{ + /* + * Write could have mapped the buffer but it didn't copy the data in + * yet. So avoid filing such buffer into a transaction. + */ + if (buffer_mapped(bh) && buffer_uptodate(bh)) + return ext3_journal_dirty_data(handle, bh); + return 0; +} + +/* For write_end() in data=journal mode */ +static int write_end_fn(handle_t *handle, struct buffer_head *bh) +{ + if (!buffer_mapped(bh) || buffer_freed(bh)) + return 0; + set_buffer_uptodate(bh); + return ext3_journal_dirty_metadata(handle, bh); +} + +/* + * This is nasty and subtle: ext3_write_begin() could have allocated blocks + * for the whole page but later we failed to copy the data in. Update inode + * size according to what we managed to copy. The rest is going to be + * truncated in write_end function. + */ +static void update_file_sizes(struct inode *inode, loff_t pos, unsigned copied) +{ + /* What matters to us is i_disksize. We don't write i_size anywhere */ + if (pos + copied > inode->i_size) + i_size_write(inode, pos + copied); + if (pos + copied > EXT3_I(inode)->i_disksize) { + EXT3_I(inode)->i_disksize = pos + copied; + mark_inode_dirty(inode); + } +} + +/* + * We need to pick up the new inode size which generic_commit_write gave us + * `file' can be NULL - eg, when called from page_symlink(). + * + * ext3 never places buffers on inode->i_mapping->private_list. metadata + * buffers are managed internally. + */ +static int ext3_ordered_write_end(struct file *file, + struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + handle_t *handle = ext3_journal_current_handle(); + struct inode *inode = file->f_mapping->host; + unsigned from, to; + int ret = 0, ret2; + + trace_ext3_ordered_write_end(inode, pos, len, copied); + copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); + + from = pos & (PAGE_CACHE_SIZE - 1); + to = from + copied; + ret = walk_page_buffers(handle, page_buffers(page), + from, to, NULL, journal_dirty_data_fn); + + if (ret == 0) + update_file_sizes(inode, pos, copied); + /* + * There may be allocated blocks outside of i_size because + * we failed to copy some data. Prepare for truncate. + */ + if (pos + len > inode->i_size && ext3_can_truncate(inode)) + ext3_orphan_add(handle, inode); + ret2 = ext3_journal_stop(handle); + if (!ret) + ret = ret2; + unlock_page(page); + page_cache_release(page); + + if (pos + len > inode->i_size) + ext3_truncate_failed_write(inode); + return ret ? ret : copied; +} + +static int ext3_writeback_write_end(struct file *file, + struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + handle_t *handle = ext3_journal_current_handle(); + struct inode *inode = file->f_mapping->host; + int ret; + + trace_ext3_writeback_write_end(inode, pos, len, copied); + copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); + update_file_sizes(inode, pos, copied); + /* + * There may be allocated blocks outside of i_size because + * we failed to copy some data. Prepare for truncate. + */ + if (pos + len > inode->i_size && ext3_can_truncate(inode)) + ext3_orphan_add(handle, inode); + ret = ext3_journal_stop(handle); + unlock_page(page); + page_cache_release(page); + + if (pos + len > inode->i_size) + ext3_truncate_failed_write(inode); + return ret ? ret : copied; +} + +static int ext3_journalled_write_end(struct file *file, + struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + handle_t *handle = ext3_journal_current_handle(); + struct inode *inode = mapping->host; + struct ext3_inode_info *ei = EXT3_I(inode); + int ret = 0, ret2; + int partial = 0; + unsigned from, to; + + trace_ext3_journalled_write_end(inode, pos, len, copied); + from = pos & (PAGE_CACHE_SIZE - 1); + to = from + len; + + if (copied < len) { + if (!PageUptodate(page)) + copied = 0; + page_zero_new_buffers(page, from + copied, to); + to = from + copied; + } + + ret = walk_page_buffers(handle, page_buffers(page), from, + to, &partial, write_end_fn); + if (!partial) + SetPageUptodate(page); + + if (pos + copied > inode->i_size) + i_size_write(inode, pos + copied); + /* + * There may be allocated blocks outside of i_size because + * we failed to copy some data. Prepare for truncate. + */ + if (pos + len > inode->i_size && ext3_can_truncate(inode)) + ext3_orphan_add(handle, inode); + ext3_set_inode_state(inode, EXT3_STATE_JDATA); + atomic_set(&ei->i_datasync_tid, handle->h_transaction->t_tid); + if (inode->i_size > ei->i_disksize) { + ei->i_disksize = inode->i_size; + ret2 = ext3_mark_inode_dirty(handle, inode); + if (!ret) + ret = ret2; + } + + ret2 = ext3_journal_stop(handle); + if (!ret) + ret = ret2; + unlock_page(page); + page_cache_release(page); + + if (pos + len > inode->i_size) + ext3_truncate_failed_write(inode); + return ret ? ret : copied; +} + +/* + * bmap() is special. It gets used by applications such as lilo and by + * the swapper to find the on-disk block of a specific piece of data. + * + * Naturally, this is dangerous if the block concerned is still in the + * journal. If somebody makes a swapfile on an ext3 data-journaling + * filesystem and enables swap, then they may get a nasty shock when the + * data getting swapped to that swapfile suddenly gets overwritten by + * the original zero's written out previously to the journal and + * awaiting writeback in the kernel's buffer cache. + * + * So, if we see any bmap calls here on a modified, data-journaled file, + * take extra steps to flush any blocks which might be in the cache. + */ +static sector_t ext3_bmap(struct address_space *mapping, sector_t block) +{ + struct inode *inode = mapping->host; + journal_t *journal; + int err; + + if (ext3_test_inode_state(inode, EXT3_STATE_JDATA)) { + /* + * This is a REALLY heavyweight approach, but the use of + * bmap on dirty files is expected to be extremely rare: + * only if we run lilo or swapon on a freshly made file + * do we expect this to happen. + * + * (bmap requires CAP_SYS_RAWIO so this does not + * represent an unprivileged user DOS attack --- we'd be + * in trouble if mortal users could trigger this path at + * will.) + * + * NB. EXT3_STATE_JDATA is not set on files other than + * regular files. If somebody wants to bmap a directory + * or symlink and gets confused because the buffer + * hasn't yet been flushed to disk, they deserve + * everything they get. + */ + + ext3_clear_inode_state(inode, EXT3_STATE_JDATA); + journal = EXT3_JOURNAL(inode); + journal_lock_updates(journal); + err = journal_flush(journal); + journal_unlock_updates(journal); + + if (err) + return 0; + } + + return generic_block_bmap(mapping,block,ext3_get_block); +} + +static int bget_one(handle_t *handle, struct buffer_head *bh) +{ + get_bh(bh); + return 0; +} + +static int bput_one(handle_t *handle, struct buffer_head *bh) +{ + put_bh(bh); + return 0; +} + +static int buffer_unmapped(handle_t *handle, struct buffer_head *bh) +{ + return !buffer_mapped(bh); +} + +/* + * Note that whenever we need to map blocks we start a transaction even if + * we're not journalling data. This is to preserve ordering: any hole + * instantiation within __block_write_full_page -> ext3_get_block() should be + * journalled along with the data so we don't crash and then get metadata which + * refers to old data. + * + * In all journalling modes block_write_full_page() will start the I/O. + * + * We don't honour synchronous mounts for writepage(). That would be + * disastrous. Any write() or metadata operation will sync the fs for + * us. + */ +static int ext3_ordered_writepage(struct page *page, + struct writeback_control *wbc) +{ + struct inode *inode = page->mapping->host; + struct buffer_head *page_bufs; + handle_t *handle = NULL; + int ret = 0; + int err; + + J_ASSERT(PageLocked(page)); + /* + * We don't want to warn for emergency remount. The condition is + * ordered to avoid dereferencing inode->i_sb in non-error case to + * avoid slow-downs. + */ + WARN_ON_ONCE(IS_RDONLY(inode) && + !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)); + + /* + * We give up here if we're reentered, because it might be for a + * different filesystem. + */ + if (ext3_journal_current_handle()) + goto out_fail; + + trace_ext3_ordered_writepage(page); + if (!page_has_buffers(page)) { + create_empty_buffers(page, inode->i_sb->s_blocksize, + (1 << BH_Dirty)|(1 << BH_Uptodate)); + page_bufs = page_buffers(page); + } else { + page_bufs = page_buffers(page); + if (!walk_page_buffers(NULL, page_bufs, 0, PAGE_CACHE_SIZE, + NULL, buffer_unmapped)) { + /* Provide NULL get_block() to catch bugs if buffers + * weren't really mapped */ + return block_write_full_page(page, NULL, wbc); + } + } + handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode)); + + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + goto out_fail; + } + + walk_page_buffers(handle, page_bufs, 0, + PAGE_CACHE_SIZE, NULL, bget_one); + + ret = block_write_full_page(page, ext3_get_block, wbc); + + /* + * The page can become unlocked at any point now, and + * truncate can then come in and change things. So we + * can't touch *page from now on. But *page_bufs is + * safe due to elevated refcount. + */ + + /* + * And attach them to the current transaction. But only if + * block_write_full_page() succeeded. Otherwise they are unmapped, + * and generally junk. + */ + if (ret == 0) + ret = walk_page_buffers(handle, page_bufs, 0, PAGE_CACHE_SIZE, + NULL, journal_dirty_data_fn); + walk_page_buffers(handle, page_bufs, 0, + PAGE_CACHE_SIZE, NULL, bput_one); + err = ext3_journal_stop(handle); + if (!ret) + ret = err; + return ret; + +out_fail: + redirty_page_for_writepage(wbc, page); + unlock_page(page); + return ret; +} + +static int ext3_writeback_writepage(struct page *page, + struct writeback_control *wbc) +{ + struct inode *inode = page->mapping->host; + handle_t *handle = NULL; + int ret = 0; + int err; + + J_ASSERT(PageLocked(page)); + /* + * We don't want to warn for emergency remount. The condition is + * ordered to avoid dereferencing inode->i_sb in non-error case to + * avoid slow-downs. + */ + WARN_ON_ONCE(IS_RDONLY(inode) && + !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)); + + if (ext3_journal_current_handle()) + goto out_fail; + + trace_ext3_writeback_writepage(page); + if (page_has_buffers(page)) { + if (!walk_page_buffers(NULL, page_buffers(page), 0, + PAGE_CACHE_SIZE, NULL, buffer_unmapped)) { + /* Provide NULL get_block() to catch bugs if buffers + * weren't really mapped */ + return block_write_full_page(page, NULL, wbc); + } + } + + handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode)); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + goto out_fail; + } + + ret = block_write_full_page(page, ext3_get_block, wbc); + + err = ext3_journal_stop(handle); + if (!ret) + ret = err; + return ret; + +out_fail: + redirty_page_for_writepage(wbc, page); + unlock_page(page); + return ret; +} + +static int ext3_journalled_writepage(struct page *page, + struct writeback_control *wbc) +{ + struct inode *inode = page->mapping->host; + handle_t *handle = NULL; + int ret = 0; + int err; + + J_ASSERT(PageLocked(page)); + /* + * We don't want to warn for emergency remount. The condition is + * ordered to avoid dereferencing inode->i_sb in non-error case to + * avoid slow-downs. + */ + WARN_ON_ONCE(IS_RDONLY(inode) && + !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)); + + trace_ext3_journalled_writepage(page); + if (!page_has_buffers(page) || PageChecked(page)) { + if (ext3_journal_current_handle()) + goto no_write; + + handle = ext3_journal_start(inode, + ext3_writepage_trans_blocks(inode)); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + goto no_write; + } + /* + * It's mmapped pagecache. Add buffers and journal it. There + * doesn't seem much point in redirtying the page here. + */ + ClearPageChecked(page); + ret = __block_write_begin(page, 0, PAGE_CACHE_SIZE, + ext3_get_block); + if (ret != 0) { + ext3_journal_stop(handle); + goto out_unlock; + } + ret = walk_page_buffers(handle, page_buffers(page), 0, + PAGE_CACHE_SIZE, NULL, do_journal_get_write_access); + + err = walk_page_buffers(handle, page_buffers(page), 0, + PAGE_CACHE_SIZE, NULL, write_end_fn); + if (ret == 0) + ret = err; + ext3_set_inode_state(inode, EXT3_STATE_JDATA); + atomic_set(&EXT3_I(inode)->i_datasync_tid, + handle->h_transaction->t_tid); + unlock_page(page); + err = ext3_journal_stop(handle); + if (!ret) + ret = err; + } else { + /* + * It is a page full of checkpoint-mode buffers. Go and write + * them. They should have been already mapped when they went + * to the journal so provide NULL get_block function to catch + * errors. + */ + ret = block_write_full_page(page, NULL, wbc); + } +out: + return ret; + +no_write: + redirty_page_for_writepage(wbc, page); +out_unlock: + unlock_page(page); + goto out; +} + +static int ext3_readpage(struct file *file, struct page *page) +{ + trace_ext3_readpage(page); + return mpage_readpage(page, ext3_get_block); +} + +static int +ext3_readpages(struct file *file, struct address_space *mapping, + struct list_head *pages, unsigned nr_pages) +{ + return mpage_readpages(mapping, pages, nr_pages, ext3_get_block); +} + +static void ext3_invalidatepage(struct page *page, unsigned int offset, + unsigned int length) +{ + journal_t *journal = EXT3_JOURNAL(page->mapping->host); + + trace_ext3_invalidatepage(page, offset, length); + + /* + * If it's a full truncate we just forget about the pending dirtying + */ + if (offset == 0 && length == PAGE_CACHE_SIZE) + ClearPageChecked(page); + + journal_invalidatepage(journal, page, offset, length); +} + +static int ext3_releasepage(struct page *page, gfp_t wait) +{ + journal_t *journal = EXT3_JOURNAL(page->mapping->host); + + trace_ext3_releasepage(page); + WARN_ON(PageChecked(page)); + if (!page_has_buffers(page)) + return 0; + return journal_try_to_free_buffers(journal, page, wait); +} + +/* + * If the O_DIRECT write will extend the file then add this inode to the + * orphan list. So recovery will truncate it back to the original size + * if the machine crashes during the write. + * + * If the O_DIRECT write is intantiating holes inside i_size and the machine + * crashes then stale disk data _may_ be exposed inside the file. But current + * VFS code falls back into buffered path in that case so we are safe. + */ +static ssize_t ext3_direct_IO(struct kiocb *iocb, struct iov_iter *iter, + loff_t offset) +{ + struct file *file = iocb->ki_filp; + struct inode *inode = file->f_mapping->host; + struct ext3_inode_info *ei = EXT3_I(inode); + handle_t *handle; + ssize_t ret; + int orphan = 0; + size_t count = iov_iter_count(iter); + int retries = 0; + + trace_ext3_direct_IO_enter(inode, offset, count, iov_iter_rw(iter)); + + if (iov_iter_rw(iter) == WRITE) { + loff_t final_size = offset + count; + + if (final_size > inode->i_size) { + /* Credits for sb + inode write */ + handle = ext3_journal_start(inode, 2); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + goto out; + } + ret = ext3_orphan_add(handle, inode); + if (ret) { + ext3_journal_stop(handle); + goto out; + } + orphan = 1; + ei->i_disksize = inode->i_size; + ext3_journal_stop(handle); + } + } + +retry: + ret = blockdev_direct_IO(iocb, inode, iter, offset, ext3_get_block); + /* + * In case of error extending write may have instantiated a few + * blocks outside i_size. Trim these off again. + */ + if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { + loff_t isize = i_size_read(inode); + loff_t end = offset + count; + + if (end > isize) + ext3_truncate_failed_direct_write(inode); + } + if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries)) + goto retry; + + if (orphan) { + int err; + + /* Credits for sb + inode write */ + handle = ext3_journal_start(inode, 2); + if (IS_ERR(handle)) { + /* This is really bad luck. We've written the data + * but cannot extend i_size. Truncate allocated blocks + * and pretend the write failed... */ + ext3_truncate_failed_direct_write(inode); + ret = PTR_ERR(handle); + if (inode->i_nlink) + ext3_orphan_del(NULL, inode); + goto out; + } + if (inode->i_nlink) + ext3_orphan_del(handle, inode); + if (ret > 0) { + loff_t end = offset + ret; + if (end > inode->i_size) { + ei->i_disksize = end; + i_size_write(inode, end); + /* + * We're going to return a positive `ret' + * here due to non-zero-length I/O, so there's + * no way of reporting error returns from + * ext3_mark_inode_dirty() to userspace. So + * ignore it. + */ + ext3_mark_inode_dirty(handle, inode); + } + } + err = ext3_journal_stop(handle); + if (ret == 0) + ret = err; + } +out: + trace_ext3_direct_IO_exit(inode, offset, count, iov_iter_rw(iter), ret); + return ret; +} + +/* + * Pages can be marked dirty completely asynchronously from ext3's journalling + * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do + * much here because ->set_page_dirty is called under VFS locks. The page is + * not necessarily locked. + * + * We cannot just dirty the page and leave attached buffers clean, because the + * buffers' dirty state is "definitive". We cannot just set the buffers dirty + * or jbddirty because all the journalling code will explode. + * + * So what we do is to mark the page "pending dirty" and next time writepage + * is called, propagate that into the buffers appropriately. + */ +static int ext3_journalled_set_page_dirty(struct page *page) +{ + SetPageChecked(page); + return __set_page_dirty_nobuffers(page); +} + +static const struct address_space_operations ext3_ordered_aops = { + .readpage = ext3_readpage, + .readpages = ext3_readpages, + .writepage = ext3_ordered_writepage, + .write_begin = ext3_write_begin, + .write_end = ext3_ordered_write_end, + .bmap = ext3_bmap, + .invalidatepage = ext3_invalidatepage, + .releasepage = ext3_releasepage, + .direct_IO = ext3_direct_IO, + .migratepage = buffer_migrate_page, + .is_partially_uptodate = block_is_partially_uptodate, + .is_dirty_writeback = buffer_check_dirty_writeback, + .error_remove_page = generic_error_remove_page, +}; + +static const struct address_space_operations ext3_writeback_aops = { + .readpage = ext3_readpage, + .readpages = ext3_readpages, + .writepage = ext3_writeback_writepage, + .write_begin = ext3_write_begin, + .write_end = ext3_writeback_write_end, + .bmap = ext3_bmap, + .invalidatepage = ext3_invalidatepage, + .releasepage = ext3_releasepage, + .direct_IO = ext3_direct_IO, + .migratepage = buffer_migrate_page, + .is_partially_uptodate = block_is_partially_uptodate, + .error_remove_page = generic_error_remove_page, +}; + +static const struct address_space_operations ext3_journalled_aops = { + .readpage = ext3_readpage, + .readpages = ext3_readpages, + .writepage = ext3_journalled_writepage, + .write_begin = ext3_write_begin, + .write_end = ext3_journalled_write_end, + .set_page_dirty = ext3_journalled_set_page_dirty, + .bmap = ext3_bmap, + .invalidatepage = ext3_invalidatepage, + .releasepage = ext3_releasepage, + .is_partially_uptodate = block_is_partially_uptodate, + .error_remove_page = generic_error_remove_page, +}; + +void ext3_set_aops(struct inode *inode) +{ + if (ext3_should_order_data(inode)) + inode->i_mapping->a_ops = &ext3_ordered_aops; + else if (ext3_should_writeback_data(inode)) + inode->i_mapping->a_ops = &ext3_writeback_aops; + else + inode->i_mapping->a_ops = &ext3_journalled_aops; +} + +/* + * ext3_block_truncate_page() zeroes out a mapping from file offset `from' + * up to the end of the block which corresponds to `from'. + * This required during truncate. We need to physically zero the tail end + * of that block so it doesn't yield old data if the file is later grown. + */ +static int ext3_block_truncate_page(struct inode *inode, loff_t from) +{ + ext3_fsblk_t index = from >> PAGE_CACHE_SHIFT; + unsigned offset = from & (PAGE_CACHE_SIZE - 1); + unsigned blocksize, iblock, length, pos; + struct page *page; + handle_t *handle = NULL; + struct buffer_head *bh; + int err = 0; + + /* Truncated on block boundary - nothing to do */ + blocksize = inode->i_sb->s_blocksize; + if ((from & (blocksize - 1)) == 0) + return 0; + + page = grab_cache_page(inode->i_mapping, index); + if (!page) + return -ENOMEM; + length = blocksize - (offset & (blocksize - 1)); + iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); + + if (!page_has_buffers(page)) + create_empty_buffers(page, blocksize, 0); + + /* Find the buffer that contains "offset" */ + bh = page_buffers(page); + pos = blocksize; + while (offset >= pos) { + bh = bh->b_this_page; + iblock++; + pos += blocksize; + } + + err = 0; + if (buffer_freed(bh)) { + BUFFER_TRACE(bh, "freed: skip"); + goto unlock; + } + + if (!buffer_mapped(bh)) { + BUFFER_TRACE(bh, "unmapped"); + ext3_get_block(inode, iblock, bh, 0); + /* unmapped? It's a hole - nothing to do */ + if (!buffer_mapped(bh)) { + BUFFER_TRACE(bh, "still unmapped"); + goto unlock; + } + } + + /* Ok, it's mapped. Make sure it's up-to-date */ + if (PageUptodate(page)) + set_buffer_uptodate(bh); + + if (!bh_uptodate_or_lock(bh)) { + err = bh_submit_read(bh); + /* Uhhuh. Read error. Complain and punt. */ + if (err) + goto unlock; + } + + /* data=writeback mode doesn't need transaction to zero-out data */ + if (!ext3_should_writeback_data(inode)) { + /* We journal at most one block */ + handle = ext3_journal_start(inode, 1); + if (IS_ERR(handle)) { + clear_highpage(page); + flush_dcache_page(page); + err = PTR_ERR(handle); + goto unlock; + } + } + + if (ext3_should_journal_data(inode)) { + BUFFER_TRACE(bh, "get write access"); + err = ext3_journal_get_write_access(handle, bh); + if (err) + goto stop; + } + + zero_user(page, offset, length); + BUFFER_TRACE(bh, "zeroed end of block"); + + err = 0; + if (ext3_should_journal_data(inode)) { + err = ext3_journal_dirty_metadata(handle, bh); + } else { + if (ext3_should_order_data(inode)) + err = ext3_journal_dirty_data(handle, bh); + mark_buffer_dirty(bh); + } +stop: + if (handle) + ext3_journal_stop(handle); + +unlock: + unlock_page(page); + page_cache_release(page); + return err; +} + +/* + * Probably it should be a library function... search for first non-zero word + * or memcmp with zero_page, whatever is better for particular architecture. + * Linus? + */ +static inline int all_zeroes(__le32 *p, __le32 *q) +{ + while (p < q) + if (*p++) + return 0; + return 1; +} + +/** + * ext3_find_shared - find the indirect blocks for partial truncation. + * @inode: inode in question + * @depth: depth of the affected branch + * @offsets: offsets of pointers in that branch (see ext3_block_to_path) + * @chain: place to store the pointers to partial indirect blocks + * @top: place to the (detached) top of branch + * + * This is a helper function used by ext3_truncate(). + * + * When we do truncate() we may have to clean the ends of several + * indirect blocks but leave the blocks themselves alive. Block is + * partially truncated if some data below the new i_size is referred + * from it (and it is on the path to the first completely truncated + * data block, indeed). We have to free the top of that path along + * with everything to the right of the path. Since no allocation + * past the truncation point is possible until ext3_truncate() + * finishes, we may safely do the latter, but top of branch may + * require special attention - pageout below the truncation point + * might try to populate it. + * + * We atomically detach the top of branch from the tree, store the + * block number of its root in *@top, pointers to buffer_heads of + * partially truncated blocks - in @chain[].bh and pointers to + * their last elements that should not be removed - in + * @chain[].p. Return value is the pointer to last filled element + * of @chain. + * + * The work left to caller to do the actual freeing of subtrees: + * a) free the subtree starting from *@top + * b) free the subtrees whose roots are stored in + * (@chain[i].p+1 .. end of @chain[i].bh->b_data) + * c) free the subtrees growing from the inode past the @chain[0]. + * (no partially truncated stuff there). */ + +static Indirect *ext3_find_shared(struct inode *inode, int depth, + int offsets[4], Indirect chain[4], __le32 *top) +{ + Indirect *partial, *p; + int k, err; + + *top = 0; + /* Make k index the deepest non-null offset + 1 */ + for (k = depth; k > 1 && !offsets[k-1]; k--) + ; + partial = ext3_get_branch(inode, k, offsets, chain, &err); + /* Writer: pointers */ + if (!partial) + partial = chain + k-1; + /* + * If the branch acquired continuation since we've looked at it - + * fine, it should all survive and (new) top doesn't belong to us. + */ + if (!partial->key && *partial->p) + /* Writer: end */ + goto no_top; + for (p=partial; p>chain && all_zeroes((__le32*)p->bh->b_data,p->p); p--) + ; + /* + * OK, we've found the last block that must survive. The rest of our + * branch should be detached before unlocking. However, if that rest + * of branch is all ours and does not grow immediately from the inode + * it's easier to cheat and just decrement partial->p. + */ + if (p == chain + k - 1 && p > chain) { + p->p--; + } else { + *top = *p->p; + /* Nope, don't do this in ext3. Must leave the tree intact */ +#if 0 + *p->p = 0; +#endif + } + /* Writer: end */ + + while(partial > p) { + brelse(partial->bh); + partial--; + } +no_top: + return partial; +} + +/* + * Zero a number of block pointers in either an inode or an indirect block. + * If we restart the transaction we must again get write access to the + * indirect block for further modification. + * + * We release `count' blocks on disk, but (last - first) may be greater + * than `count' because there can be holes in there. + */ +static void ext3_clear_blocks(handle_t *handle, struct inode *inode, + struct buffer_head *bh, ext3_fsblk_t block_to_free, + unsigned long count, __le32 *first, __le32 *last) +{ + __le32 *p; + if (try_to_extend_transaction(handle, inode)) { + if (bh) { + BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); + if (ext3_journal_dirty_metadata(handle, bh)) + return; + } + ext3_mark_inode_dirty(handle, inode); + truncate_restart_transaction(handle, inode); + if (bh) { + BUFFER_TRACE(bh, "retaking write access"); + if (ext3_journal_get_write_access(handle, bh)) + return; + } + } + + /* + * Any buffers which are on the journal will be in memory. We find + * them on the hash table so journal_revoke() will run journal_forget() + * on them. We've already detached each block from the file, so + * bforget() in journal_forget() should be safe. + * + * AKPM: turn on bforget in journal_forget()!!! + */ + for (p = first; p < last; p++) { + u32 nr = le32_to_cpu(*p); + if (nr) { + struct buffer_head *bh; + + *p = 0; + bh = sb_find_get_block(inode->i_sb, nr); + ext3_forget(handle, 0, inode, bh, nr); + } + } + + ext3_free_blocks(handle, inode, block_to_free, count); +} + +/** + * ext3_free_data - free a list of data blocks + * @handle: handle for this transaction + * @inode: inode we are dealing with + * @this_bh: indirect buffer_head which contains *@first and *@last + * @first: array of block numbers + * @last: points immediately past the end of array + * + * We are freeing all blocks referred from that array (numbers are stored as + * little-endian 32-bit) and updating @inode->i_blocks appropriately. + * + * We accumulate contiguous runs of blocks to free. Conveniently, if these + * blocks are contiguous then releasing them at one time will only affect one + * or two bitmap blocks (+ group descriptor(s) and superblock) and we won't + * actually use a lot of journal space. + * + * @this_bh will be %NULL if @first and @last point into the inode's direct + * block pointers. + */ +static void ext3_free_data(handle_t *handle, struct inode *inode, + struct buffer_head *this_bh, + __le32 *first, __le32 *last) +{ + ext3_fsblk_t block_to_free = 0; /* Starting block # of a run */ + unsigned long count = 0; /* Number of blocks in the run */ + __le32 *block_to_free_p = NULL; /* Pointer into inode/ind + corresponding to + block_to_free */ + ext3_fsblk_t nr; /* Current block # */ + __le32 *p; /* Pointer into inode/ind + for current block */ + int err; + + if (this_bh) { /* For indirect block */ + BUFFER_TRACE(this_bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, this_bh); + /* Important: if we can't update the indirect pointers + * to the blocks, we can't free them. */ + if (err) + return; + } + + for (p = first; p < last; p++) { + nr = le32_to_cpu(*p); + if (nr) { + /* accumulate blocks to free if they're contiguous */ + if (count == 0) { + block_to_free = nr; + block_to_free_p = p; + count = 1; + } else if (nr == block_to_free + count) { + count++; + } else { + ext3_clear_blocks(handle, inode, this_bh, + block_to_free, + count, block_to_free_p, p); + block_to_free = nr; + block_to_free_p = p; + count = 1; + } + } + } + + if (count > 0) + ext3_clear_blocks(handle, inode, this_bh, block_to_free, + count, block_to_free_p, p); + + if (this_bh) { + BUFFER_TRACE(this_bh, "call ext3_journal_dirty_metadata"); + + /* + * The buffer head should have an attached journal head at this + * point. However, if the data is corrupted and an indirect + * block pointed to itself, it would have been detached when + * the block was cleared. Check for this instead of OOPSing. + */ + if (bh2jh(this_bh)) + ext3_journal_dirty_metadata(handle, this_bh); + else + ext3_error(inode->i_sb, "ext3_free_data", + "circular indirect block detected, " + "inode=%lu, block=%llu", + inode->i_ino, + (unsigned long long)this_bh->b_blocknr); + } +} + +/** + * ext3_free_branches - free an array of branches + * @handle: JBD handle for this transaction + * @inode: inode we are dealing with + * @parent_bh: the buffer_head which contains *@first and *@last + * @first: array of block numbers + * @last: pointer immediately past the end of array + * @depth: depth of the branches to free + * + * We are freeing all blocks referred from these branches (numbers are + * stored as little-endian 32-bit) and updating @inode->i_blocks + * appropriately. + */ +static void ext3_free_branches(handle_t *handle, struct inode *inode, + struct buffer_head *parent_bh, + __le32 *first, __le32 *last, int depth) +{ + ext3_fsblk_t nr; + __le32 *p; + + if (is_handle_aborted(handle)) + return; + + if (depth--) { + struct buffer_head *bh; + int addr_per_block = EXT3_ADDR_PER_BLOCK(inode->i_sb); + p = last; + while (--p >= first) { + nr = le32_to_cpu(*p); + if (!nr) + continue; /* A hole */ + + /* Go read the buffer for the next level down */ + bh = sb_bread(inode->i_sb, nr); + + /* + * A read failure? Report error and clear slot + * (should be rare). + */ + if (!bh) { + ext3_error(inode->i_sb, "ext3_free_branches", + "Read failure, inode=%lu, block="E3FSBLK, + inode->i_ino, nr); + continue; + } + + /* This zaps the entire block. Bottom up. */ + BUFFER_TRACE(bh, "free child branches"); + ext3_free_branches(handle, inode, bh, + (__le32*)bh->b_data, + (__le32*)bh->b_data + addr_per_block, + depth); + + /* + * Everything below this this pointer has been + * released. Now let this top-of-subtree go. + * + * We want the freeing of this indirect block to be + * atomic in the journal with the updating of the + * bitmap block which owns it. So make some room in + * the journal. + * + * We zero the parent pointer *after* freeing its + * pointee in the bitmaps, so if extend_transaction() + * for some reason fails to put the bitmap changes and + * the release into the same transaction, recovery + * will merely complain about releasing a free block, + * rather than leaking blocks. + */ + if (is_handle_aborted(handle)) + return; + if (try_to_extend_transaction(handle, inode)) { + ext3_mark_inode_dirty(handle, inode); + truncate_restart_transaction(handle, inode); + } + + /* + * We've probably journalled the indirect block several + * times during the truncate. But it's no longer + * needed and we now drop it from the transaction via + * journal_revoke(). + * + * That's easy if it's exclusively part of this + * transaction. But if it's part of the committing + * transaction then journal_forget() will simply + * brelse() it. That means that if the underlying + * block is reallocated in ext3_get_block(), + * unmap_underlying_metadata() will find this block + * and will try to get rid of it. damn, damn. Thus + * we don't allow a block to be reallocated until + * a transaction freeing it has fully committed. + * + * We also have to make sure journal replay after a + * crash does not overwrite non-journaled data blocks + * with old metadata when the block got reallocated for + * data. Thus we have to store a revoke record for a + * block in the same transaction in which we free the + * block. + */ + ext3_forget(handle, 1, inode, bh, bh->b_blocknr); + + ext3_free_blocks(handle, inode, nr, 1); + + if (parent_bh) { + /* + * The block which we have just freed is + * pointed to by an indirect block: journal it + */ + BUFFER_TRACE(parent_bh, "get_write_access"); + if (!ext3_journal_get_write_access(handle, + parent_bh)){ + *p = 0; + BUFFER_TRACE(parent_bh, + "call ext3_journal_dirty_metadata"); + ext3_journal_dirty_metadata(handle, + parent_bh); + } + } + } + } else { + /* We have reached the bottom of the tree. */ + BUFFER_TRACE(parent_bh, "free data blocks"); + ext3_free_data(handle, inode, parent_bh, first, last); + } +} + +int ext3_can_truncate(struct inode *inode) +{ + if (S_ISREG(inode->i_mode)) + return 1; + if (S_ISDIR(inode->i_mode)) + return 1; + if (S_ISLNK(inode->i_mode)) + return !ext3_inode_is_fast_symlink(inode); + return 0; +} + +/* + * ext3_truncate() + * + * We block out ext3_get_block() block instantiations across the entire + * transaction, and VFS/VM ensures that ext3_truncate() cannot run + * simultaneously on behalf of the same inode. + * + * As we work through the truncate and commit bits of it to the journal there + * is one core, guiding principle: the file's tree must always be consistent on + * disk. We must be able to restart the truncate after a crash. + * + * The file's tree may be transiently inconsistent in memory (although it + * probably isn't), but whenever we close off and commit a journal transaction, + * the contents of (the filesystem + the journal) must be consistent and + * restartable. It's pretty simple, really: bottom up, right to left (although + * left-to-right works OK too). + * + * Note that at recovery time, journal replay occurs *before* the restart of + * truncate against the orphan inode list. + * + * The committed inode has the new, desired i_size (which is the same as + * i_disksize in this case). After a crash, ext3_orphan_cleanup() will see + * that this inode's truncate did not complete and it will again call + * ext3_truncate() to have another go. So there will be instantiated blocks + * to the right of the truncation point in a crashed ext3 filesystem. But + * that's fine - as long as they are linked from the inode, the post-crash + * ext3_truncate() run will find them and release them. + */ +void ext3_truncate(struct inode *inode) +{ + handle_t *handle; + struct ext3_inode_info *ei = EXT3_I(inode); + __le32 *i_data = ei->i_data; + int addr_per_block = EXT3_ADDR_PER_BLOCK(inode->i_sb); + int offsets[4]; + Indirect chain[4]; + Indirect *partial; + __le32 nr = 0; + int n; + long last_block; + unsigned blocksize = inode->i_sb->s_blocksize; + + trace_ext3_truncate_enter(inode); + + if (!ext3_can_truncate(inode)) + goto out_notrans; + + if (inode->i_size == 0 && ext3_should_writeback_data(inode)) + ext3_set_inode_state(inode, EXT3_STATE_FLUSH_ON_CLOSE); + + handle = start_transaction(inode); + if (IS_ERR(handle)) + goto out_notrans; + + last_block = (inode->i_size + blocksize-1) + >> EXT3_BLOCK_SIZE_BITS(inode->i_sb); + n = ext3_block_to_path(inode, last_block, offsets, NULL); + if (n == 0) + goto out_stop; /* error */ + + /* + * OK. This truncate is going to happen. We add the inode to the + * orphan list, so that if this truncate spans multiple transactions, + * and we crash, we will resume the truncate when the filesystem + * recovers. It also marks the inode dirty, to catch the new size. + * + * Implication: the file must always be in a sane, consistent + * truncatable state while each transaction commits. + */ + if (ext3_orphan_add(handle, inode)) + goto out_stop; + + /* + * The orphan list entry will now protect us from any crash which + * occurs before the truncate completes, so it is now safe to propagate + * the new, shorter inode size (held for now in i_size) into the + * on-disk inode. We do this via i_disksize, which is the value which + * ext3 *really* writes onto the disk inode. + */ + ei->i_disksize = inode->i_size; + + /* + * From here we block out all ext3_get_block() callers who want to + * modify the block allocation tree. + */ + mutex_lock(&ei->truncate_mutex); + + if (n == 1) { /* direct blocks */ + ext3_free_data(handle, inode, NULL, i_data+offsets[0], + i_data + EXT3_NDIR_BLOCKS); + goto do_indirects; + } + + partial = ext3_find_shared(inode, n, offsets, chain, &nr); + /* Kill the top of shared branch (not detached) */ + if (nr) { + if (partial == chain) { + /* Shared branch grows from the inode */ + ext3_free_branches(handle, inode, NULL, + &nr, &nr+1, (chain+n-1) - partial); + *partial->p = 0; + /* + * We mark the inode dirty prior to restart, + * and prior to stop. No need for it here. + */ + } else { + /* Shared branch grows from an indirect block */ + ext3_free_branches(handle, inode, partial->bh, + partial->p, + partial->p+1, (chain+n-1) - partial); + } + } + /* Clear the ends of indirect blocks on the shared branch */ + while (partial > chain) { + ext3_free_branches(handle, inode, partial->bh, partial->p + 1, + (__le32*)partial->bh->b_data+addr_per_block, + (chain+n-1) - partial); + BUFFER_TRACE(partial->bh, "call brelse"); + brelse (partial->bh); + partial--; + } +do_indirects: + /* Kill the remaining (whole) subtrees */ + switch (offsets[0]) { + default: + nr = i_data[EXT3_IND_BLOCK]; + if (nr) { + ext3_free_branches(handle, inode, NULL, &nr, &nr+1, 1); + i_data[EXT3_IND_BLOCK] = 0; + } + case EXT3_IND_BLOCK: + nr = i_data[EXT3_DIND_BLOCK]; + if (nr) { + ext3_free_branches(handle, inode, NULL, &nr, &nr+1, 2); + i_data[EXT3_DIND_BLOCK] = 0; + } + case EXT3_DIND_BLOCK: + nr = i_data[EXT3_TIND_BLOCK]; + if (nr) { + ext3_free_branches(handle, inode, NULL, &nr, &nr+1, 3); + i_data[EXT3_TIND_BLOCK] = 0; + } + case EXT3_TIND_BLOCK: + ; + } + + ext3_discard_reservation(inode); + + mutex_unlock(&ei->truncate_mutex); + inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; + ext3_mark_inode_dirty(handle, inode); + + /* + * In a multi-transaction truncate, we only make the final transaction + * synchronous + */ + if (IS_SYNC(inode)) + handle->h_sync = 1; +out_stop: + /* + * If this was a simple ftruncate(), and the file will remain alive + * then we need to clear up the orphan record which we created above. + * However, if this was a real unlink then we were called by + * ext3_evict_inode(), and we allow that function to clean up the + * orphan info for us. + */ + if (inode->i_nlink) + ext3_orphan_del(handle, inode); + + ext3_journal_stop(handle); + trace_ext3_truncate_exit(inode); + return; +out_notrans: + /* + * Delete the inode from orphan list so that it doesn't stay there + * forever and trigger assertion on umount. + */ + if (inode->i_nlink) + ext3_orphan_del(NULL, inode); + trace_ext3_truncate_exit(inode); +} + +static ext3_fsblk_t ext3_get_inode_block(struct super_block *sb, + unsigned long ino, struct ext3_iloc *iloc) +{ + unsigned long block_group; + unsigned long offset; + ext3_fsblk_t block; + struct ext3_group_desc *gdp; + + if (!ext3_valid_inum(sb, ino)) { + /* + * This error is already checked for in namei.c unless we are + * looking at an NFS filehandle, in which case no error + * report is needed + */ + return 0; + } + + block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb); + gdp = ext3_get_group_desc(sb, block_group, NULL); + if (!gdp) + return 0; + /* + * Figure out the offset within the block group inode table + */ + offset = ((ino - 1) % EXT3_INODES_PER_GROUP(sb)) * + EXT3_INODE_SIZE(sb); + block = le32_to_cpu(gdp->bg_inode_table) + + (offset >> EXT3_BLOCK_SIZE_BITS(sb)); + + iloc->block_group = block_group; + iloc->offset = offset & (EXT3_BLOCK_SIZE(sb) - 1); + return block; +} + +/* + * ext3_get_inode_loc returns with an extra refcount against the inode's + * underlying buffer_head on success. If 'in_mem' is true, we have all + * data in memory that is needed to recreate the on-disk version of this + * inode. + */ +static int __ext3_get_inode_loc(struct inode *inode, + struct ext3_iloc *iloc, int in_mem) +{ + ext3_fsblk_t block; + struct buffer_head *bh; + + block = ext3_get_inode_block(inode->i_sb, inode->i_ino, iloc); + if (!block) + return -EIO; + + bh = sb_getblk(inode->i_sb, block); + if (unlikely(!bh)) { + ext3_error (inode->i_sb, "ext3_get_inode_loc", + "unable to read inode block - " + "inode=%lu, block="E3FSBLK, + inode->i_ino, block); + return -ENOMEM; + } + if (!buffer_uptodate(bh)) { + lock_buffer(bh); + + /* + * If the buffer has the write error flag, we have failed + * to write out another inode in the same block. In this + * case, we don't have to read the block because we may + * read the old inode data successfully. + */ + if (buffer_write_io_error(bh) && !buffer_uptodate(bh)) + set_buffer_uptodate(bh); + + if (buffer_uptodate(bh)) { + /* someone brought it uptodate while we waited */ + unlock_buffer(bh); + goto has_buffer; + } + + /* + * If we have all information of the inode in memory and this + * is the only valid inode in the block, we need not read the + * block. + */ + if (in_mem) { + struct buffer_head *bitmap_bh; + struct ext3_group_desc *desc; + int inodes_per_buffer; + int inode_offset, i; + int block_group; + int start; + + block_group = (inode->i_ino - 1) / + EXT3_INODES_PER_GROUP(inode->i_sb); + inodes_per_buffer = bh->b_size / + EXT3_INODE_SIZE(inode->i_sb); + inode_offset = ((inode->i_ino - 1) % + EXT3_INODES_PER_GROUP(inode->i_sb)); + start = inode_offset & ~(inodes_per_buffer - 1); + + /* Is the inode bitmap in cache? */ + desc = ext3_get_group_desc(inode->i_sb, + block_group, NULL); + if (!desc) + goto make_io; + + bitmap_bh = sb_getblk(inode->i_sb, + le32_to_cpu(desc->bg_inode_bitmap)); + if (unlikely(!bitmap_bh)) + goto make_io; + + /* + * If the inode bitmap isn't in cache then the + * optimisation may end up performing two reads instead + * of one, so skip it. + */ + if (!buffer_uptodate(bitmap_bh)) { + brelse(bitmap_bh); + goto make_io; + } + for (i = start; i < start + inodes_per_buffer; i++) { + if (i == inode_offset) + continue; + if (ext3_test_bit(i, bitmap_bh->b_data)) + break; + } + brelse(bitmap_bh); + if (i == start + inodes_per_buffer) { + /* all other inodes are free, so skip I/O */ + memset(bh->b_data, 0, bh->b_size); + set_buffer_uptodate(bh); + unlock_buffer(bh); + goto has_buffer; + } + } + +make_io: + /* + * There are other valid inodes in the buffer, this inode + * has in-inode xattrs, or we don't have this inode in memory. + * Read the block from disk. + */ + trace_ext3_load_inode(inode); + get_bh(bh); + bh->b_end_io = end_buffer_read_sync; + submit_bh(READ | REQ_META | REQ_PRIO, bh); + wait_on_buffer(bh); + if (!buffer_uptodate(bh)) { + ext3_error(inode->i_sb, "ext3_get_inode_loc", + "unable to read inode block - " + "inode=%lu, block="E3FSBLK, + inode->i_ino, block); + brelse(bh); + return -EIO; + } + } +has_buffer: + iloc->bh = bh; + return 0; +} + +int ext3_get_inode_loc(struct inode *inode, struct ext3_iloc *iloc) +{ + /* We have all inode data except xattrs in memory here. */ + return __ext3_get_inode_loc(inode, iloc, + !ext3_test_inode_state(inode, EXT3_STATE_XATTR)); +} + +void ext3_set_inode_flags(struct inode *inode) +{ + unsigned int flags = EXT3_I(inode)->i_flags; + + inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); + if (flags & EXT3_SYNC_FL) + inode->i_flags |= S_SYNC; + if (flags & EXT3_APPEND_FL) + inode->i_flags |= S_APPEND; + if (flags & EXT3_IMMUTABLE_FL) + inode->i_flags |= S_IMMUTABLE; + if (flags & EXT3_NOATIME_FL) + inode->i_flags |= S_NOATIME; + if (flags & EXT3_DIRSYNC_FL) + inode->i_flags |= S_DIRSYNC; +} + +/* Propagate flags from i_flags to EXT3_I(inode)->i_flags */ +void ext3_get_inode_flags(struct ext3_inode_info *ei) +{ + unsigned int flags = ei->vfs_inode.i_flags; + + ei->i_flags &= ~(EXT3_SYNC_FL|EXT3_APPEND_FL| + EXT3_IMMUTABLE_FL|EXT3_NOATIME_FL|EXT3_DIRSYNC_FL); + if (flags & S_SYNC) + ei->i_flags |= EXT3_SYNC_FL; + if (flags & S_APPEND) + ei->i_flags |= EXT3_APPEND_FL; + if (flags & S_IMMUTABLE) + ei->i_flags |= EXT3_IMMUTABLE_FL; + if (flags & S_NOATIME) + ei->i_flags |= EXT3_NOATIME_FL; + if (flags & S_DIRSYNC) + ei->i_flags |= EXT3_DIRSYNC_FL; +} + +struct inode *ext3_iget(struct super_block *sb, unsigned long ino) +{ + struct ext3_iloc iloc; + struct ext3_inode *raw_inode; + struct ext3_inode_info *ei; + struct buffer_head *bh; + struct inode *inode; + journal_t *journal = EXT3_SB(sb)->s_journal; + transaction_t *transaction; + long ret; + int block; + uid_t i_uid; + gid_t i_gid; + + inode = iget_locked(sb, ino); + if (!inode) + return ERR_PTR(-ENOMEM); + if (!(inode->i_state & I_NEW)) + return inode; + + ei = EXT3_I(inode); + ei->i_block_alloc_info = NULL; + + ret = __ext3_get_inode_loc(inode, &iloc, 0); + if (ret < 0) + goto bad_inode; + bh = iloc.bh; + raw_inode = ext3_raw_inode(&iloc); + inode->i_mode = le16_to_cpu(raw_inode->i_mode); + i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low); + i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low); + if(!(test_opt (inode->i_sb, NO_UID32))) { + i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16; + i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16; + } + i_uid_write(inode, i_uid); + i_gid_write(inode, i_gid); + set_nlink(inode, le16_to_cpu(raw_inode->i_links_count)); + inode->i_size = le32_to_cpu(raw_inode->i_size); + inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime); + inode->i_ctime.tv_sec = (signed)le32_to_cpu(raw_inode->i_ctime); + inode->i_mtime.tv_sec = (signed)le32_to_cpu(raw_inode->i_mtime); + inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_mtime.tv_nsec = 0; + + ei->i_state_flags = 0; + ei->i_dir_start_lookup = 0; + ei->i_dtime = le32_to_cpu(raw_inode->i_dtime); + /* We now have enough fields to check if the inode was active or not. + * This is needed because nfsd might try to access dead inodes + * the test is that same one that e2fsck uses + * NeilBrown 1999oct15 + */ + if (inode->i_nlink == 0) { + if (inode->i_mode == 0 || + !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ORPHAN_FS)) { + /* this inode is deleted */ + brelse (bh); + ret = -ESTALE; + goto bad_inode; + } + /* The only unlinked inodes we let through here have + * valid i_mode and are being read by the orphan + * recovery code: that's fine, we're about to complete + * the process of deleting those. */ + } + inode->i_blocks = le32_to_cpu(raw_inode->i_blocks); + ei->i_flags = le32_to_cpu(raw_inode->i_flags); +#ifdef EXT3_FRAGMENTS + ei->i_faddr = le32_to_cpu(raw_inode->i_faddr); + ei->i_frag_no = raw_inode->i_frag; + ei->i_frag_size = raw_inode->i_fsize; +#endif + ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); + if (!S_ISREG(inode->i_mode)) { + ei->i_dir_acl = le32_to_cpu(raw_inode->i_dir_acl); + } else { + inode->i_size |= + ((__u64)le32_to_cpu(raw_inode->i_size_high)) << 32; + } + ei->i_disksize = inode->i_size; + inode->i_generation = le32_to_cpu(raw_inode->i_generation); + ei->i_block_group = iloc.block_group; + /* + * NOTE! The in-memory inode i_data array is in little-endian order + * even on big-endian machines: we do NOT byteswap the block numbers! + */ + for (block = 0; block < EXT3_N_BLOCKS; block++) + ei->i_data[block] = raw_inode->i_block[block]; + INIT_LIST_HEAD(&ei->i_orphan); + + /* + * Set transaction id's of transactions that have to be committed + * to finish f[data]sync. We set them to currently running transaction + * as we cannot be sure that the inode or some of its metadata isn't + * part of the transaction - the inode could have been reclaimed and + * now it is reread from disk. + */ + if (journal) { + tid_t tid; + + spin_lock(&journal->j_state_lock); + if (journal->j_running_transaction) + transaction = journal->j_running_transaction; + else + transaction = journal->j_committing_transaction; + if (transaction) + tid = transaction->t_tid; + else + tid = journal->j_commit_sequence; + spin_unlock(&journal->j_state_lock); + atomic_set(&ei->i_sync_tid, tid); + atomic_set(&ei->i_datasync_tid, tid); + } + + if (inode->i_ino >= EXT3_FIRST_INO(inode->i_sb) + 1 && + EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) { + /* + * When mke2fs creates big inodes it does not zero out + * the unused bytes above EXT3_GOOD_OLD_INODE_SIZE, + * so ignore those first few inodes. + */ + ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize); + if (EXT3_GOOD_OLD_INODE_SIZE + ei->i_extra_isize > + EXT3_INODE_SIZE(inode->i_sb)) { + brelse (bh); + ret = -EIO; + goto bad_inode; + } + if (ei->i_extra_isize == 0) { + /* The extra space is currently unused. Use it. */ + ei->i_extra_isize = sizeof(struct ext3_inode) - + EXT3_GOOD_OLD_INODE_SIZE; + } else { + __le32 *magic = (void *)raw_inode + + EXT3_GOOD_OLD_INODE_SIZE + + ei->i_extra_isize; + if (*magic == cpu_to_le32(EXT3_XATTR_MAGIC)) + ext3_set_inode_state(inode, EXT3_STATE_XATTR); + } + } else + ei->i_extra_isize = 0; + + if (S_ISREG(inode->i_mode)) { + inode->i_op = &ext3_file_inode_operations; + inode->i_fop = &ext3_file_operations; + ext3_set_aops(inode); + } else if (S_ISDIR(inode->i_mode)) { + inode->i_op = &ext3_dir_inode_operations; + inode->i_fop = &ext3_dir_operations; + } else if (S_ISLNK(inode->i_mode)) { + if (ext3_inode_is_fast_symlink(inode)) { + inode->i_op = &ext3_fast_symlink_inode_operations; + nd_terminate_link(ei->i_data, inode->i_size, + sizeof(ei->i_data) - 1); + } else { + inode->i_op = &ext3_symlink_inode_operations; + ext3_set_aops(inode); + } + } else { + inode->i_op = &ext3_special_inode_operations; + if (raw_inode->i_block[0]) + init_special_inode(inode, inode->i_mode, + old_decode_dev(le32_to_cpu(raw_inode->i_block[0]))); + else + init_special_inode(inode, inode->i_mode, + new_decode_dev(le32_to_cpu(raw_inode->i_block[1]))); + } + brelse (iloc.bh); + ext3_set_inode_flags(inode); + unlock_new_inode(inode); + return inode; + +bad_inode: + iget_failed(inode); + return ERR_PTR(ret); +} + +/* + * Post the struct inode info into an on-disk inode location in the + * buffer-cache. This gobbles the caller's reference to the + * buffer_head in the inode location struct. + * + * The caller must have write access to iloc->bh. + */ +static int ext3_do_update_inode(handle_t *handle, + struct inode *inode, + struct ext3_iloc *iloc) +{ + struct ext3_inode *raw_inode = ext3_raw_inode(iloc); + struct ext3_inode_info *ei = EXT3_I(inode); + struct buffer_head *bh = iloc->bh; + int err = 0, rc, block; + int need_datasync = 0; + __le32 disksize; + uid_t i_uid; + gid_t i_gid; + +again: + /* we can't allow multiple procs in here at once, its a bit racey */ + lock_buffer(bh); + + /* For fields not not tracking in the in-memory inode, + * initialise them to zero for new inodes. */ + if (ext3_test_inode_state(inode, EXT3_STATE_NEW)) + memset(raw_inode, 0, EXT3_SB(inode->i_sb)->s_inode_size); + + ext3_get_inode_flags(ei); + raw_inode->i_mode = cpu_to_le16(inode->i_mode); + i_uid = i_uid_read(inode); + i_gid = i_gid_read(inode); + if(!(test_opt(inode->i_sb, NO_UID32))) { + raw_inode->i_uid_low = cpu_to_le16(low_16_bits(i_uid)); + raw_inode->i_gid_low = cpu_to_le16(low_16_bits(i_gid)); +/* + * Fix up interoperability with old kernels. Otherwise, old inodes get + * re-used with the upper 16 bits of the uid/gid intact + */ + if(!ei->i_dtime) { + raw_inode->i_uid_high = + cpu_to_le16(high_16_bits(i_uid)); + raw_inode->i_gid_high = + cpu_to_le16(high_16_bits(i_gid)); + } else { + raw_inode->i_uid_high = 0; + raw_inode->i_gid_high = 0; + } + } else { + raw_inode->i_uid_low = + cpu_to_le16(fs_high2lowuid(i_uid)); + raw_inode->i_gid_low = + cpu_to_le16(fs_high2lowgid(i_gid)); + raw_inode->i_uid_high = 0; + raw_inode->i_gid_high = 0; + } + raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); + disksize = cpu_to_le32(ei->i_disksize); + if (disksize != raw_inode->i_size) { + need_datasync = 1; + raw_inode->i_size = disksize; + } + raw_inode->i_atime = cpu_to_le32(inode->i_atime.tv_sec); + raw_inode->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); + raw_inode->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); + raw_inode->i_blocks = cpu_to_le32(inode->i_blocks); + raw_inode->i_dtime = cpu_to_le32(ei->i_dtime); + raw_inode->i_flags = cpu_to_le32(ei->i_flags); +#ifdef EXT3_FRAGMENTS + raw_inode->i_faddr = cpu_to_le32(ei->i_faddr); + raw_inode->i_frag = ei->i_frag_no; + raw_inode->i_fsize = ei->i_frag_size; +#endif + raw_inode->i_file_acl = cpu_to_le32(ei->i_file_acl); + if (!S_ISREG(inode->i_mode)) { + raw_inode->i_dir_acl = cpu_to_le32(ei->i_dir_acl); + } else { + disksize = cpu_to_le32(ei->i_disksize >> 32); + if (disksize != raw_inode->i_size_high) { + raw_inode->i_size_high = disksize; + need_datasync = 1; + } + if (ei->i_disksize > 0x7fffffffULL) { + struct super_block *sb = inode->i_sb; + if (!EXT3_HAS_RO_COMPAT_FEATURE(sb, + EXT3_FEATURE_RO_COMPAT_LARGE_FILE) || + EXT3_SB(sb)->s_es->s_rev_level == + cpu_to_le32(EXT3_GOOD_OLD_REV)) { + /* If this is the first large file + * created, add a flag to the superblock. + */ + unlock_buffer(bh); + err = ext3_journal_get_write_access(handle, + EXT3_SB(sb)->s_sbh); + if (err) + goto out_brelse; + + ext3_update_dynamic_rev(sb); + EXT3_SET_RO_COMPAT_FEATURE(sb, + EXT3_FEATURE_RO_COMPAT_LARGE_FILE); + handle->h_sync = 1; + err = ext3_journal_dirty_metadata(handle, + EXT3_SB(sb)->s_sbh); + /* get our lock and start over */ + goto again; + } + } + } + raw_inode->i_generation = cpu_to_le32(inode->i_generation); + if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { + if (old_valid_dev(inode->i_rdev)) { + raw_inode->i_block[0] = + cpu_to_le32(old_encode_dev(inode->i_rdev)); + raw_inode->i_block[1] = 0; + } else { + raw_inode->i_block[0] = 0; + raw_inode->i_block[1] = + cpu_to_le32(new_encode_dev(inode->i_rdev)); + raw_inode->i_block[2] = 0; + } + } else for (block = 0; block < EXT3_N_BLOCKS; block++) + raw_inode->i_block[block] = ei->i_data[block]; + + if (ei->i_extra_isize) + raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize); + + BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); + unlock_buffer(bh); + rc = ext3_journal_dirty_metadata(handle, bh); + if (!err) + err = rc; + ext3_clear_inode_state(inode, EXT3_STATE_NEW); + + atomic_set(&ei->i_sync_tid, handle->h_transaction->t_tid); + if (need_datasync) + atomic_set(&ei->i_datasync_tid, handle->h_transaction->t_tid); +out_brelse: + brelse (bh); + ext3_std_error(inode->i_sb, err); + return err; +} + +/* + * ext3_write_inode() + * + * We are called from a few places: + * + * - Within generic_file_aio_write() -> generic_write_sync() for O_SYNC files. + * Here, there will be no transaction running. We wait for any running + * transaction to commit. + * + * - Within flush work (for sys_sync(), kupdate and such). + * We wait on commit, if told to. + * + * - Within iput_final() -> write_inode_now() + * We wait on commit, if told to. + * + * In all cases it is actually safe for us to return without doing anything, + * because the inode has been copied into a raw inode buffer in + * ext3_mark_inode_dirty(). This is a correctness thing for WB_SYNC_ALL + * writeback. + * + * Note that we are absolutely dependent upon all inode dirtiers doing the + * right thing: they *must* call mark_inode_dirty() after dirtying info in + * which we are interested. + * + * It would be a bug for them to not do this. The code: + * + * mark_inode_dirty(inode) + * stuff(); + * inode->i_size = expr; + * + * is in error because write_inode() could occur while `stuff()' is running, + * and the new i_size will be lost. Plus the inode will no longer be on the + * superblock's dirty inode list. + */ +int ext3_write_inode(struct inode *inode, struct writeback_control *wbc) +{ + if (WARN_ON_ONCE(current->flags & PF_MEMALLOC)) + return 0; + + if (ext3_journal_current_handle()) { + jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n"); + dump_stack(); + return -EIO; + } + + /* + * No need to force transaction in WB_SYNC_NONE mode. Also + * ext3_sync_fs() will force the commit after everything is + * written. + */ + if (wbc->sync_mode != WB_SYNC_ALL || wbc->for_sync) + return 0; + + return ext3_force_commit(inode->i_sb); +} + +/* + * ext3_setattr() + * + * Called from notify_change. + * + * We want to trap VFS attempts to truncate the file as soon as + * possible. In particular, we want to make sure that when the VFS + * shrinks i_size, we put the inode on the orphan list and modify + * i_disksize immediately, so that during the subsequent flushing of + * dirty pages and freeing of disk blocks, we can guarantee that any + * commit will leave the blocks being flushed in an unused state on + * disk. (On recovery, the inode will get truncated and the blocks will + * be freed, so we have a strong guarantee that no future commit will + * leave these blocks visible to the user.) + * + * Called with inode->sem down. + */ +int ext3_setattr(struct dentry *dentry, struct iattr *attr) +{ + struct inode *inode = d_inode(dentry); + int error, rc = 0; + const unsigned int ia_valid = attr->ia_valid; + + error = inode_change_ok(inode, attr); + if (error) + return error; + + if (is_quota_modification(inode, attr)) + dquot_initialize(inode); + if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) || + (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) { + handle_t *handle; + + /* (user+group)*(old+new) structure, inode write (sb, + * inode block, ? - but truncate inode update has it) */ + handle = ext3_journal_start(inode, EXT3_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)+ + EXT3_MAXQUOTAS_DEL_BLOCKS(inode->i_sb)+3); + if (IS_ERR(handle)) { + error = PTR_ERR(handle); + goto err_out; + } + error = dquot_transfer(inode, attr); + if (error) { + ext3_journal_stop(handle); + return error; + } + /* Update corresponding info in inode so that everything is in + * one transaction */ + if (attr->ia_valid & ATTR_UID) + inode->i_uid = attr->ia_uid; + if (attr->ia_valid & ATTR_GID) + inode->i_gid = attr->ia_gid; + error = ext3_mark_inode_dirty(handle, inode); + ext3_journal_stop(handle); + } + + if (attr->ia_valid & ATTR_SIZE) + inode_dio_wait(inode); + + if (S_ISREG(inode->i_mode) && + attr->ia_valid & ATTR_SIZE && attr->ia_size < inode->i_size) { + handle_t *handle; + + handle = ext3_journal_start(inode, 3); + if (IS_ERR(handle)) { + error = PTR_ERR(handle); + goto err_out; + } + + error = ext3_orphan_add(handle, inode); + if (error) { + ext3_journal_stop(handle); + goto err_out; + } + EXT3_I(inode)->i_disksize = attr->ia_size; + error = ext3_mark_inode_dirty(handle, inode); + ext3_journal_stop(handle); + if (error) { + /* Some hard fs error must have happened. Bail out. */ + ext3_orphan_del(NULL, inode); + goto err_out; + } + rc = ext3_block_truncate_page(inode, attr->ia_size); + if (rc) { + /* Cleanup orphan list and exit */ + handle = ext3_journal_start(inode, 3); + if (IS_ERR(handle)) { + ext3_orphan_del(NULL, inode); + goto err_out; + } + ext3_orphan_del(handle, inode); + ext3_journal_stop(handle); + goto err_out; + } + } + + if ((attr->ia_valid & ATTR_SIZE) && + attr->ia_size != i_size_read(inode)) { + truncate_setsize(inode, attr->ia_size); + ext3_truncate(inode); + } + + setattr_copy(inode, attr); + mark_inode_dirty(inode); + + if (ia_valid & ATTR_MODE) + rc = posix_acl_chmod(inode, inode->i_mode); + +err_out: + ext3_std_error(inode->i_sb, error); + if (!error) + error = rc; + return error; +} + + +/* + * How many blocks doth make a writepage()? + * + * With N blocks per page, it may be: + * N data blocks + * 2 indirect block + * 2 dindirect + * 1 tindirect + * N+5 bitmap blocks (from the above) + * N+5 group descriptor summary blocks + * 1 inode block + * 1 superblock. + * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quote files + * + * 3 * (N + 5) + 2 + 2 * EXT3_SINGLEDATA_TRANS_BLOCKS + * + * With ordered or writeback data it's the same, less the N data blocks. + * + * If the inode's direct blocks can hold an integral number of pages then a + * page cannot straddle two indirect blocks, and we can only touch one indirect + * and dindirect block, and the "5" above becomes "3". + * + * This still overestimates under most circumstances. If we were to pass the + * start and end offsets in here as well we could do block_to_path() on each + * block and work out the exact number of indirects which are touched. Pah. + */ + +static int ext3_writepage_trans_blocks(struct inode *inode) +{ + int bpp = ext3_journal_blocks_per_page(inode); + int indirects = (EXT3_NDIR_BLOCKS % bpp) ? 5 : 3; + int ret; + + if (ext3_should_journal_data(inode)) + ret = 3 * (bpp + indirects) + 2; + else + ret = 2 * (bpp + indirects) + indirects + 2; + +#ifdef CONFIG_QUOTA + /* We know that structure was already allocated during dquot_initialize so + * we will be updating only the data blocks + inodes */ + ret += EXT3_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb); +#endif + + return ret; +} + +/* + * The caller must have previously called ext3_reserve_inode_write(). + * Give this, we know that the caller already has write access to iloc->bh. + */ +int ext3_mark_iloc_dirty(handle_t *handle, + struct inode *inode, struct ext3_iloc *iloc) +{ + int err = 0; + + /* the do_update_inode consumes one bh->b_count */ + get_bh(iloc->bh); + + /* ext3_do_update_inode() does journal_dirty_metadata */ + err = ext3_do_update_inode(handle, inode, iloc); + put_bh(iloc->bh); + return err; +} + +/* + * On success, We end up with an outstanding reference count against + * iloc->bh. This _must_ be cleaned up later. + */ + +int +ext3_reserve_inode_write(handle_t *handle, struct inode *inode, + struct ext3_iloc *iloc) +{ + int err = 0; + if (handle) { + err = ext3_get_inode_loc(inode, iloc); + if (!err) { + BUFFER_TRACE(iloc->bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, iloc->bh); + if (err) { + brelse(iloc->bh); + iloc->bh = NULL; + } + } + } + ext3_std_error(inode->i_sb, err); + return err; +} + +/* + * What we do here is to mark the in-core inode as clean with respect to inode + * dirtiness (it may still be data-dirty). + * This means that the in-core inode may be reaped by prune_icache + * without having to perform any I/O. This is a very good thing, + * because *any* task may call prune_icache - even ones which + * have a transaction open against a different journal. + * + * Is this cheating? Not really. Sure, we haven't written the + * inode out, but prune_icache isn't a user-visible syncing function. + * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync) + * we start and wait on commits. + */ +int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode) +{ + struct ext3_iloc iloc; + int err; + + might_sleep(); + trace_ext3_mark_inode_dirty(inode, _RET_IP_); + err = ext3_reserve_inode_write(handle, inode, &iloc); + if (!err) + err = ext3_mark_iloc_dirty(handle, inode, &iloc); + return err; +} + +/* + * ext3_dirty_inode() is called from __mark_inode_dirty() + * + * We're really interested in the case where a file is being extended. + * i_size has been changed by generic_commit_write() and we thus need + * to include the updated inode in the current transaction. + * + * Also, dquot_alloc_space() will always dirty the inode when blocks + * are allocated to the file. + * + * If the inode is marked synchronous, we don't honour that here - doing + * so would cause a commit on atime updates, which we don't bother doing. + * We handle synchronous inodes at the highest possible level. + */ +void ext3_dirty_inode(struct inode *inode, int flags) +{ + handle_t *current_handle = ext3_journal_current_handle(); + handle_t *handle; + + handle = ext3_journal_start(inode, 2); + if (IS_ERR(handle)) + goto out; + if (current_handle && + current_handle->h_transaction != handle->h_transaction) { + /* This task has a transaction open against a different fs */ + printk(KERN_EMERG "%s: transactions do not match!\n", + __func__); + } else { + jbd_debug(5, "marking dirty. outer handle=%p\n", + current_handle); + ext3_mark_inode_dirty(handle, inode); + } + ext3_journal_stop(handle); +out: + return; +} + +#if 0 +/* + * Bind an inode's backing buffer_head into this transaction, to prevent + * it from being flushed to disk early. Unlike + * ext3_reserve_inode_write, this leaves behind no bh reference and + * returns no iloc structure, so the caller needs to repeat the iloc + * lookup to mark the inode dirty later. + */ +static int ext3_pin_inode(handle_t *handle, struct inode *inode) +{ + struct ext3_iloc iloc; + + int err = 0; + if (handle) { + err = ext3_get_inode_loc(inode, &iloc); + if (!err) { + BUFFER_TRACE(iloc.bh, "get_write_access"); + err = journal_get_write_access(handle, iloc.bh); + if (!err) + err = ext3_journal_dirty_metadata(handle, + iloc.bh); + brelse(iloc.bh); + } + } + ext3_std_error(inode->i_sb, err); + return err; +} +#endif + +int ext3_change_inode_journal_flag(struct inode *inode, int val) +{ + journal_t *journal; + handle_t *handle; + int err; + + /* + * We have to be very careful here: changing a data block's + * journaling status dynamically is dangerous. If we write a + * data block to the journal, change the status and then delete + * that block, we risk forgetting to revoke the old log record + * from the journal and so a subsequent replay can corrupt data. + * So, first we make sure that the journal is empty and that + * nobody is changing anything. + */ + + journal = EXT3_JOURNAL(inode); + if (is_journal_aborted(journal)) + return -EROFS; + + journal_lock_updates(journal); + journal_flush(journal); + + /* + * OK, there are no updates running now, and all cached data is + * synced to disk. We are now in a completely consistent state + * which doesn't have anything in the journal, and we know that + * no filesystem updates are running, so it is safe to modify + * the inode's in-core data-journaling state flag now. + */ + + if (val) + EXT3_I(inode)->i_flags |= EXT3_JOURNAL_DATA_FL; + else + EXT3_I(inode)->i_flags &= ~EXT3_JOURNAL_DATA_FL; + ext3_set_aops(inode); + + journal_unlock_updates(journal); + + /* Finally we can mark the inode as dirty. */ + + handle = ext3_journal_start(inode, 1); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + err = ext3_mark_inode_dirty(handle, inode); + handle->h_sync = 1; + ext3_journal_stop(handle); + ext3_std_error(inode->i_sb, err); + + return err; +} diff --git a/kernel/fs/ext3/ioctl.c b/kernel/fs/ext3/ioctl.c new file mode 100644 index 000000000..4d96e9a64 --- /dev/null +++ b/kernel/fs/ext3/ioctl.c @@ -0,0 +1,327 @@ +/* + * linux/fs/ext3/ioctl.c + * + * Copyright (C) 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + */ + +#include +#include +#include +#include "ext3.h" + +long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct inode *inode = file_inode(filp); + struct ext3_inode_info *ei = EXT3_I(inode); + unsigned int flags; + unsigned short rsv_window_size; + + ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg); + + switch (cmd) { + case EXT3_IOC_GETFLAGS: + ext3_get_inode_flags(ei); + flags = ei->i_flags & EXT3_FL_USER_VISIBLE; + return put_user(flags, (int __user *) arg); + case EXT3_IOC_SETFLAGS: { + handle_t *handle = NULL; + int err; + struct ext3_iloc iloc; + unsigned int oldflags; + unsigned int jflag; + + if (!inode_owner_or_capable(inode)) + return -EACCES; + + if (get_user(flags, (int __user *) arg)) + return -EFAULT; + + err = mnt_want_write_file(filp); + if (err) + return err; + + flags = ext3_mask_flags(inode->i_mode, flags); + + mutex_lock(&inode->i_mutex); + + /* Is it quota file? Do not allow user to mess with it */ + err = -EPERM; + if (IS_NOQUOTA(inode)) + goto flags_out; + + oldflags = ei->i_flags; + + /* The JOURNAL_DATA flag is modifiable only by root */ + jflag = flags & EXT3_JOURNAL_DATA_FL; + + /* + * The IMMUTABLE and APPEND_ONLY flags can only be changed by + * the relevant capability. + * + * This test looks nicer. Thanks to Pauline Middelink + */ + if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) { + if (!capable(CAP_LINUX_IMMUTABLE)) + goto flags_out; + } + + /* + * The JOURNAL_DATA flag can only be changed by + * the relevant capability. + */ + if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) { + if (!capable(CAP_SYS_RESOURCE)) + goto flags_out; + } + + handle = ext3_journal_start(inode, 1); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + goto flags_out; + } + if (IS_SYNC(inode)) + handle->h_sync = 1; + err = ext3_reserve_inode_write(handle, inode, &iloc); + if (err) + goto flags_err; + + flags = flags & EXT3_FL_USER_MODIFIABLE; + flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE; + ei->i_flags = flags; + + ext3_set_inode_flags(inode); + inode->i_ctime = CURRENT_TIME_SEC; + + err = ext3_mark_iloc_dirty(handle, inode, &iloc); +flags_err: + ext3_journal_stop(handle); + if (err) + goto flags_out; + + if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) + err = ext3_change_inode_journal_flag(inode, jflag); +flags_out: + mutex_unlock(&inode->i_mutex); + mnt_drop_write_file(filp); + return err; + } + case EXT3_IOC_GETVERSION: + case EXT3_IOC_GETVERSION_OLD: + return put_user(inode->i_generation, (int __user *) arg); + case EXT3_IOC_SETVERSION: + case EXT3_IOC_SETVERSION_OLD: { + handle_t *handle; + struct ext3_iloc iloc; + __u32 generation; + int err; + + if (!inode_owner_or_capable(inode)) + return -EPERM; + + err = mnt_want_write_file(filp); + if (err) + return err; + if (get_user(generation, (int __user *) arg)) { + err = -EFAULT; + goto setversion_out; + } + + mutex_lock(&inode->i_mutex); + handle = ext3_journal_start(inode, 1); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + goto unlock_out; + } + err = ext3_reserve_inode_write(handle, inode, &iloc); + if (err == 0) { + inode->i_ctime = CURRENT_TIME_SEC; + inode->i_generation = generation; + err = ext3_mark_iloc_dirty(handle, inode, &iloc); + } + ext3_journal_stop(handle); + +unlock_out: + mutex_unlock(&inode->i_mutex); +setversion_out: + mnt_drop_write_file(filp); + return err; + } + case EXT3_IOC_GETRSVSZ: + if (test_opt(inode->i_sb, RESERVATION) + && S_ISREG(inode->i_mode) + && ei->i_block_alloc_info) { + rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; + return put_user(rsv_window_size, (int __user *)arg); + } + return -ENOTTY; + case EXT3_IOC_SETRSVSZ: { + int err; + + if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) + return -ENOTTY; + + err = mnt_want_write_file(filp); + if (err) + return err; + + if (!inode_owner_or_capable(inode)) { + err = -EACCES; + goto setrsvsz_out; + } + + if (get_user(rsv_window_size, (int __user *)arg)) { + err = -EFAULT; + goto setrsvsz_out; + } + + if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS) + rsv_window_size = EXT3_MAX_RESERVE_BLOCKS; + + /* + * need to allocate reservation structure for this inode + * before set the window size + */ + mutex_lock(&ei->truncate_mutex); + if (!ei->i_block_alloc_info) + ext3_init_block_alloc_info(inode); + + if (ei->i_block_alloc_info){ + struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; + rsv->rsv_goal_size = rsv_window_size; + } + mutex_unlock(&ei->truncate_mutex); +setrsvsz_out: + mnt_drop_write_file(filp); + return err; + } + case EXT3_IOC_GROUP_EXTEND: { + ext3_fsblk_t n_blocks_count; + struct super_block *sb = inode->i_sb; + int err, err2; + + if (!capable(CAP_SYS_RESOURCE)) + return -EPERM; + + err = mnt_want_write_file(filp); + if (err) + return err; + + if (get_user(n_blocks_count, (__u32 __user *)arg)) { + err = -EFAULT; + goto group_extend_out; + } + err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count); + journal_lock_updates(EXT3_SB(sb)->s_journal); + err2 = journal_flush(EXT3_SB(sb)->s_journal); + journal_unlock_updates(EXT3_SB(sb)->s_journal); + if (err == 0) + err = err2; +group_extend_out: + mnt_drop_write_file(filp); + return err; + } + case EXT3_IOC_GROUP_ADD: { + struct ext3_new_group_data input; + struct super_block *sb = inode->i_sb; + int err, err2; + + if (!capable(CAP_SYS_RESOURCE)) + return -EPERM; + + err = mnt_want_write_file(filp); + if (err) + return err; + + if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg, + sizeof(input))) { + err = -EFAULT; + goto group_add_out; + } + + err = ext3_group_add(sb, &input); + journal_lock_updates(EXT3_SB(sb)->s_journal); + err2 = journal_flush(EXT3_SB(sb)->s_journal); + journal_unlock_updates(EXT3_SB(sb)->s_journal); + if (err == 0) + err = err2; +group_add_out: + mnt_drop_write_file(filp); + return err; + } + case FITRIM: { + + struct super_block *sb = inode->i_sb; + struct fstrim_range range; + int ret = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (copy_from_user(&range, (struct fstrim_range __user *)arg, + sizeof(range))) + return -EFAULT; + + ret = ext3_trim_fs(sb, &range); + if (ret < 0) + return ret; + + if (copy_to_user((struct fstrim_range __user *)arg, &range, + sizeof(range))) + return -EFAULT; + + return 0; + } + + default: + return -ENOTTY; + } +} + +#ifdef CONFIG_COMPAT +long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + /* These are just misnamed, they actually get/put from/to user an int */ + switch (cmd) { + case EXT3_IOC32_GETFLAGS: + cmd = EXT3_IOC_GETFLAGS; + break; + case EXT3_IOC32_SETFLAGS: + cmd = EXT3_IOC_SETFLAGS; + break; + case EXT3_IOC32_GETVERSION: + cmd = EXT3_IOC_GETVERSION; + break; + case EXT3_IOC32_SETVERSION: + cmd = EXT3_IOC_SETVERSION; + break; + case EXT3_IOC32_GROUP_EXTEND: + cmd = EXT3_IOC_GROUP_EXTEND; + break; + case EXT3_IOC32_GETVERSION_OLD: + cmd = EXT3_IOC_GETVERSION_OLD; + break; + case EXT3_IOC32_SETVERSION_OLD: + cmd = EXT3_IOC_SETVERSION_OLD; + break; +#ifdef CONFIG_JBD_DEBUG + case EXT3_IOC32_WAIT_FOR_READONLY: + cmd = EXT3_IOC_WAIT_FOR_READONLY; + break; +#endif + case EXT3_IOC32_GETRSVSZ: + cmd = EXT3_IOC_GETRSVSZ; + break; + case EXT3_IOC32_SETRSVSZ: + cmd = EXT3_IOC_SETRSVSZ; + break; + case EXT3_IOC_GROUP_ADD: + break; + default: + return -ENOIOCTLCMD; + } + return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); +} +#endif diff --git a/kernel/fs/ext3/namei.c b/kernel/fs/ext3/namei.c new file mode 100644 index 000000000..4264b9bd0 --- /dev/null +++ b/kernel/fs/ext3/namei.c @@ -0,0 +1,2585 @@ +/* + * linux/fs/ext3/namei.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/namei.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * Big-endian to little-endian byte-swapping/bitmaps by + * David S. Miller (davem@caip.rutgers.edu), 1995 + * Directory entry file type support and forward compatibility hooks + * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998 + * Hash Tree Directory indexing (c) + * Daniel Phillips, 2001 + * Hash Tree Directory indexing porting + * Christopher Li, 2002 + * Hash Tree Directory indexing cleanup + * Theodore Ts'o, 2002 + */ + +#include +#include "ext3.h" +#include "namei.h" +#include "xattr.h" +#include "acl.h" + +/* + * define how far ahead to read directories while searching them. + */ +#define NAMEI_RA_CHUNKS 2 +#define NAMEI_RA_BLOCKS 4 +#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) + +static struct buffer_head *ext3_append(handle_t *handle, + struct inode *inode, + u32 *block, int *err) +{ + struct buffer_head *bh; + + *block = inode->i_size >> inode->i_sb->s_blocksize_bits; + + if ((bh = ext3_dir_bread(handle, inode, *block, 1, err))) { + inode->i_size += inode->i_sb->s_blocksize; + EXT3_I(inode)->i_disksize = inode->i_size; + *err = ext3_journal_get_write_access(handle, bh); + if (*err) { + brelse(bh); + bh = NULL; + } + } + return bh; +} + +#ifndef assert +#define assert(test) J_ASSERT(test) +#endif + +#ifdef DX_DEBUG +#define dxtrace(command) command +#else +#define dxtrace(command) +#endif + +struct fake_dirent +{ + __le32 inode; + __le16 rec_len; + u8 name_len; + u8 file_type; +}; + +struct dx_countlimit +{ + __le16 limit; + __le16 count; +}; + +struct dx_entry +{ + __le32 hash; + __le32 block; +}; + +/* + * dx_root_info is laid out so that if it should somehow get overlaid by a + * dirent the two low bits of the hash version will be zero. Therefore, the + * hash version mod 4 should never be 0. Sincerely, the paranoia department. + */ + +struct dx_root +{ + struct fake_dirent dot; + char dot_name[4]; + struct fake_dirent dotdot; + char dotdot_name[4]; + struct dx_root_info + { + __le32 reserved_zero; + u8 hash_version; + u8 info_length; /* 8 */ + u8 indirect_levels; + u8 unused_flags; + } + info; + struct dx_entry entries[0]; +}; + +struct dx_node +{ + struct fake_dirent fake; + struct dx_entry entries[0]; +}; + + +struct dx_frame +{ + struct buffer_head *bh; + struct dx_entry *entries; + struct dx_entry *at; +}; + +struct dx_map_entry +{ + u32 hash; + u16 offs; + u16 size; +}; + +static inline unsigned dx_get_block (struct dx_entry *entry); +static void dx_set_block (struct dx_entry *entry, unsigned value); +static inline unsigned dx_get_hash (struct dx_entry *entry); +static void dx_set_hash (struct dx_entry *entry, unsigned value); +static unsigned dx_get_count (struct dx_entry *entries); +static unsigned dx_get_limit (struct dx_entry *entries); +static void dx_set_count (struct dx_entry *entries, unsigned value); +static void dx_set_limit (struct dx_entry *entries, unsigned value); +static unsigned dx_root_limit (struct inode *dir, unsigned infosize); +static unsigned dx_node_limit (struct inode *dir); +static struct dx_frame *dx_probe(struct qstr *entry, + struct inode *dir, + struct dx_hash_info *hinfo, + struct dx_frame *frame, + int *err); +static void dx_release (struct dx_frame *frames); +static int dx_make_map(struct ext3_dir_entry_2 *de, unsigned blocksize, + struct dx_hash_info *hinfo, struct dx_map_entry map[]); +static void dx_sort_map(struct dx_map_entry *map, unsigned count); +static struct ext3_dir_entry_2 *dx_move_dirents (char *from, char *to, + struct dx_map_entry *offsets, int count); +static struct ext3_dir_entry_2 *dx_pack_dirents(char *base, unsigned blocksize); +static void dx_insert_block (struct dx_frame *frame, u32 hash, u32 block); +static int ext3_htree_next_block(struct inode *dir, __u32 hash, + struct dx_frame *frame, + struct dx_frame *frames, + __u32 *start_hash); +static struct buffer_head * ext3_dx_find_entry(struct inode *dir, + struct qstr *entry, struct ext3_dir_entry_2 **res_dir, + int *err); +static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry, + struct inode *inode); + +/* + * p is at least 6 bytes before the end of page + */ +static inline struct ext3_dir_entry_2 * +ext3_next_entry(struct ext3_dir_entry_2 *p) +{ + return (struct ext3_dir_entry_2 *)((char *)p + + ext3_rec_len_from_disk(p->rec_len)); +} + +/* + * Future: use high four bits of block for coalesce-on-delete flags + * Mask them off for now. + */ + +static inline unsigned dx_get_block (struct dx_entry *entry) +{ + return le32_to_cpu(entry->block) & 0x00ffffff; +} + +static inline void dx_set_block (struct dx_entry *entry, unsigned value) +{ + entry->block = cpu_to_le32(value); +} + +static inline unsigned dx_get_hash (struct dx_entry *entry) +{ + return le32_to_cpu(entry->hash); +} + +static inline void dx_set_hash (struct dx_entry *entry, unsigned value) +{ + entry->hash = cpu_to_le32(value); +} + +static inline unsigned dx_get_count (struct dx_entry *entries) +{ + return le16_to_cpu(((struct dx_countlimit *) entries)->count); +} + +static inline unsigned dx_get_limit (struct dx_entry *entries) +{ + return le16_to_cpu(((struct dx_countlimit *) entries)->limit); +} + +static inline void dx_set_count (struct dx_entry *entries, unsigned value) +{ + ((struct dx_countlimit *) entries)->count = cpu_to_le16(value); +} + +static inline void dx_set_limit (struct dx_entry *entries, unsigned value) +{ + ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value); +} + +static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize) +{ + unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(1) - + EXT3_DIR_REC_LEN(2) - infosize; + return entry_space / sizeof(struct dx_entry); +} + +static inline unsigned dx_node_limit (struct inode *dir) +{ + unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(0); + return entry_space / sizeof(struct dx_entry); +} + +/* + * Debug + */ +#ifdef DX_DEBUG +static void dx_show_index (char * label, struct dx_entry *entries) +{ + int i, n = dx_get_count (entries); + printk("%s index ", label); + for (i = 0; i < n; i++) + { + printk("%x->%u ", i? dx_get_hash(entries + i): 0, dx_get_block(entries + i)); + } + printk("\n"); +} + +struct stats +{ + unsigned names; + unsigned space; + unsigned bcount; +}; + +static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext3_dir_entry_2 *de, + int size, int show_names) +{ + unsigned names = 0, space = 0; + char *base = (char *) de; + struct dx_hash_info h = *hinfo; + + printk("names: "); + while ((char *) de < base + size) + { + if (de->inode) + { + if (show_names) + { + int len = de->name_len; + char *name = de->name; + while (len--) printk("%c", *name++); + ext3fs_dirhash(de->name, de->name_len, &h); + printk(":%x.%u ", h.hash, + (unsigned) ((char *) de - base)); + } + space += EXT3_DIR_REC_LEN(de->name_len); + names++; + } + de = ext3_next_entry(de); + } + printk("(%i)\n", names); + return (struct stats) { names, space, 1 }; +} + +struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir, + struct dx_entry *entries, int levels) +{ + unsigned blocksize = dir->i_sb->s_blocksize; + unsigned count = dx_get_count (entries), names = 0, space = 0, i; + unsigned bcount = 0; + struct buffer_head *bh; + int err; + printk("%i indexed blocks...\n", count); + for (i = 0; i < count; i++, entries++) + { + u32 block = dx_get_block(entries), hash = i? dx_get_hash(entries): 0; + u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash; + struct stats stats; + printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range); + if (!(bh = ext3_bread (NULL,dir, block, 0,&err))) continue; + stats = levels? + dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1): + dx_show_leaf(hinfo, (struct ext3_dir_entry_2 *) bh->b_data, blocksize, 0); + names += stats.names; + space += stats.space; + bcount += stats.bcount; + brelse (bh); + } + if (bcount) + printk("%snames %u, fullness %u (%u%%)\n", levels?"":" ", + names, space/bcount,(space/bcount)*100/blocksize); + return (struct stats) { names, space, bcount}; +} +#endif /* DX_DEBUG */ + +/* + * Probe for a directory leaf block to search. + * + * dx_probe can return ERR_BAD_DX_DIR, which means there was a format + * error in the directory index, and the caller should fall back to + * searching the directory normally. The callers of dx_probe **MUST** + * check for this error code, and make sure it never gets reflected + * back to userspace. + */ +static struct dx_frame * +dx_probe(struct qstr *entry, struct inode *dir, + struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err) +{ + unsigned count, indirect; + struct dx_entry *at, *entries, *p, *q, *m; + struct dx_root *root; + struct buffer_head *bh; + struct dx_frame *frame = frame_in; + u32 hash; + + frame->bh = NULL; + if (!(bh = ext3_dir_bread(NULL, dir, 0, 0, err))) { + *err = ERR_BAD_DX_DIR; + goto fail; + } + root = (struct dx_root *) bh->b_data; + if (root->info.hash_version != DX_HASH_TEA && + root->info.hash_version != DX_HASH_HALF_MD4 && + root->info.hash_version != DX_HASH_LEGACY) { + ext3_warning(dir->i_sb, __func__, + "Unrecognised inode hash code %d", + root->info.hash_version); + brelse(bh); + *err = ERR_BAD_DX_DIR; + goto fail; + } + hinfo->hash_version = root->info.hash_version; + if (hinfo->hash_version <= DX_HASH_TEA) + hinfo->hash_version += EXT3_SB(dir->i_sb)->s_hash_unsigned; + hinfo->seed = EXT3_SB(dir->i_sb)->s_hash_seed; + if (entry) + ext3fs_dirhash(entry->name, entry->len, hinfo); + hash = hinfo->hash; + + if (root->info.unused_flags & 1) { + ext3_warning(dir->i_sb, __func__, + "Unimplemented inode hash flags: %#06x", + root->info.unused_flags); + brelse(bh); + *err = ERR_BAD_DX_DIR; + goto fail; + } + + if ((indirect = root->info.indirect_levels) > 1) { + ext3_warning(dir->i_sb, __func__, + "Unimplemented inode hash depth: %#06x", + root->info.indirect_levels); + brelse(bh); + *err = ERR_BAD_DX_DIR; + goto fail; + } + + entries = (struct dx_entry *) (((char *)&root->info) + + root->info.info_length); + + if (dx_get_limit(entries) != dx_root_limit(dir, + root->info.info_length)) { + ext3_warning(dir->i_sb, __func__, + "dx entry: limit != root limit"); + brelse(bh); + *err = ERR_BAD_DX_DIR; + goto fail; + } + + dxtrace (printk("Look up %x", hash)); + while (1) + { + count = dx_get_count(entries); + if (!count || count > dx_get_limit(entries)) { + ext3_warning(dir->i_sb, __func__, + "dx entry: no count or count > limit"); + brelse(bh); + *err = ERR_BAD_DX_DIR; + goto fail2; + } + + p = entries + 1; + q = entries + count - 1; + while (p <= q) + { + m = p + (q - p)/2; + dxtrace(printk(".")); + if (dx_get_hash(m) > hash) + q = m - 1; + else + p = m + 1; + } + + if (0) // linear search cross check + { + unsigned n = count - 1; + at = entries; + while (n--) + { + dxtrace(printk(",")); + if (dx_get_hash(++at) > hash) + { + at--; + break; + } + } + assert (at == p - 1); + } + + at = p - 1; + dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at))); + frame->bh = bh; + frame->entries = entries; + frame->at = at; + if (!indirect--) return frame; + if (!(bh = ext3_dir_bread(NULL, dir, dx_get_block(at), 0, err))) { + *err = ERR_BAD_DX_DIR; + goto fail2; + } + at = entries = ((struct dx_node *) bh->b_data)->entries; + if (dx_get_limit(entries) != dx_node_limit (dir)) { + ext3_warning(dir->i_sb, __func__, + "dx entry: limit != node limit"); + brelse(bh); + *err = ERR_BAD_DX_DIR; + goto fail2; + } + frame++; + frame->bh = NULL; + } +fail2: + while (frame >= frame_in) { + brelse(frame->bh); + frame--; + } +fail: + if (*err == ERR_BAD_DX_DIR) + ext3_warning(dir->i_sb, __func__, + "Corrupt dir inode %ld, running e2fsck is " + "recommended.", dir->i_ino); + return NULL; +} + +static void dx_release (struct dx_frame *frames) +{ + if (frames[0].bh == NULL) + return; + + if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels) + brelse(frames[1].bh); + brelse(frames[0].bh); +} + +/* + * This function increments the frame pointer to search the next leaf + * block, and reads in the necessary intervening nodes if the search + * should be necessary. Whether or not the search is necessary is + * controlled by the hash parameter. If the hash value is even, then + * the search is only continued if the next block starts with that + * hash value. This is used if we are searching for a specific file. + * + * If the hash value is HASH_NB_ALWAYS, then always go to the next block. + * + * This function returns 1 if the caller should continue to search, + * or 0 if it should not. If there is an error reading one of the + * index blocks, it will a negative error code. + * + * If start_hash is non-null, it will be filled in with the starting + * hash of the next page. + */ +static int ext3_htree_next_block(struct inode *dir, __u32 hash, + struct dx_frame *frame, + struct dx_frame *frames, + __u32 *start_hash) +{ + struct dx_frame *p; + struct buffer_head *bh; + int err, num_frames = 0; + __u32 bhash; + + p = frame; + /* + * Find the next leaf page by incrementing the frame pointer. + * If we run out of entries in the interior node, loop around and + * increment pointer in the parent node. When we break out of + * this loop, num_frames indicates the number of interior + * nodes need to be read. + */ + while (1) { + if (++(p->at) < p->entries + dx_get_count(p->entries)) + break; + if (p == frames) + return 0; + num_frames++; + p--; + } + + /* + * If the hash is 1, then continue only if the next page has a + * continuation hash of any value. This is used for readdir + * handling. Otherwise, check to see if the hash matches the + * desired contiuation hash. If it doesn't, return since + * there's no point to read in the successive index pages. + */ + bhash = dx_get_hash(p->at); + if (start_hash) + *start_hash = bhash; + if ((hash & 1) == 0) { + if ((bhash & ~1) != hash) + return 0; + } + /* + * If the hash is HASH_NB_ALWAYS, we always go to the next + * block so no check is necessary + */ + while (num_frames--) { + if (!(bh = ext3_dir_bread(NULL, dir, dx_get_block(p->at), + 0, &err))) + return err; /* Failure */ + p++; + brelse (p->bh); + p->bh = bh; + p->at = p->entries = ((struct dx_node *) bh->b_data)->entries; + } + return 1; +} + + +/* + * This function fills a red-black tree with information from a + * directory block. It returns the number directory entries loaded + * into the tree. If there is an error it is returned in err. + */ +static int htree_dirblock_to_tree(struct file *dir_file, + struct inode *dir, int block, + struct dx_hash_info *hinfo, + __u32 start_hash, __u32 start_minor_hash) +{ + struct buffer_head *bh; + struct ext3_dir_entry_2 *de, *top; + int err = 0, count = 0; + + dxtrace(printk("In htree dirblock_to_tree: block %d\n", block)); + + if (!(bh = ext3_dir_bread(NULL, dir, block, 0, &err))) + return err; + + de = (struct ext3_dir_entry_2 *) bh->b_data; + top = (struct ext3_dir_entry_2 *) ((char *) de + + dir->i_sb->s_blocksize - + EXT3_DIR_REC_LEN(0)); + for (; de < top; de = ext3_next_entry(de)) { + if (!ext3_check_dir_entry("htree_dirblock_to_tree", dir, de, bh, + (block<i_sb)) + +((char *)de - bh->b_data))) { + /* silently ignore the rest of the block */ + break; + } + ext3fs_dirhash(de->name, de->name_len, hinfo); + if ((hinfo->hash < start_hash) || + ((hinfo->hash == start_hash) && + (hinfo->minor_hash < start_minor_hash))) + continue; + if (de->inode == 0) + continue; + if ((err = ext3_htree_store_dirent(dir_file, + hinfo->hash, hinfo->minor_hash, de)) != 0) { + brelse(bh); + return err; + } + count++; + } + brelse(bh); + return count; +} + + +/* + * This function fills a red-black tree with information from a + * directory. We start scanning the directory in hash order, starting + * at start_hash and start_minor_hash. + * + * This function returns the number of entries inserted into the tree, + * or a negative error code. + */ +int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash, + __u32 start_minor_hash, __u32 *next_hash) +{ + struct dx_hash_info hinfo; + struct ext3_dir_entry_2 *de; + struct dx_frame frames[2], *frame; + struct inode *dir; + int block, err; + int count = 0; + int ret; + __u32 hashval; + + dxtrace(printk("In htree_fill_tree, start hash: %x:%x\n", start_hash, + start_minor_hash)); + dir = file_inode(dir_file); + if (!(EXT3_I(dir)->i_flags & EXT3_INDEX_FL)) { + hinfo.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version; + if (hinfo.hash_version <= DX_HASH_TEA) + hinfo.hash_version += + EXT3_SB(dir->i_sb)->s_hash_unsigned; + hinfo.seed = EXT3_SB(dir->i_sb)->s_hash_seed; + count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo, + start_hash, start_minor_hash); + *next_hash = ~0; + return count; + } + hinfo.hash = start_hash; + hinfo.minor_hash = 0; + frame = dx_probe(NULL, file_inode(dir_file), &hinfo, frames, &err); + if (!frame) + return err; + + /* Add '.' and '..' from the htree header */ + if (!start_hash && !start_minor_hash) { + de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data; + if ((err = ext3_htree_store_dirent(dir_file, 0, 0, de)) != 0) + goto errout; + count++; + } + if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) { + de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data; + de = ext3_next_entry(de); + if ((err = ext3_htree_store_dirent(dir_file, 2, 0, de)) != 0) + goto errout; + count++; + } + + while (1) { + block = dx_get_block(frame->at); + ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo, + start_hash, start_minor_hash); + if (ret < 0) { + err = ret; + goto errout; + } + count += ret; + hashval = ~0; + ret = ext3_htree_next_block(dir, HASH_NB_ALWAYS, + frame, frames, &hashval); + *next_hash = hashval; + if (ret < 0) { + err = ret; + goto errout; + } + /* + * Stop if: (a) there are no more entries, or + * (b) we have inserted at least one entry and the + * next hash value is not a continuation + */ + if ((ret == 0) || + (count && ((hashval & 1) == 0))) + break; + } + dx_release(frames); + dxtrace(printk("Fill tree: returned %d entries, next hash: %x\n", + count, *next_hash)); + return count; +errout: + dx_release(frames); + return (err); +} + + +/* + * Directory block splitting, compacting + */ + +/* + * Create map of hash values, offsets, and sizes, stored at end of block. + * Returns number of entries mapped. + */ +static int dx_make_map(struct ext3_dir_entry_2 *de, unsigned blocksize, + struct dx_hash_info *hinfo, struct dx_map_entry *map_tail) +{ + int count = 0; + char *base = (char *) de; + struct dx_hash_info h = *hinfo; + + while ((char *) de < base + blocksize) + { + if (de->name_len && de->inode) { + ext3fs_dirhash(de->name, de->name_len, &h); + map_tail--; + map_tail->hash = h.hash; + map_tail->offs = (u16) ((char *) de - base); + map_tail->size = le16_to_cpu(de->rec_len); + count++; + cond_resched(); + } + /* XXX: do we need to check rec_len == 0 case? -Chris */ + de = ext3_next_entry(de); + } + return count; +} + +/* Sort map by hash value */ +static void dx_sort_map (struct dx_map_entry *map, unsigned count) +{ + struct dx_map_entry *p, *q, *top = map + count - 1; + int more; + /* Combsort until bubble sort doesn't suck */ + while (count > 2) + { + count = count*10/13; + if (count - 9 < 2) /* 9, 10 -> 11 */ + count = 11; + for (p = top, q = p - count; q >= map; p--, q--) + if (p->hash < q->hash) + swap(*p, *q); + } + /* Garden variety bubble sort */ + do { + more = 0; + q = top; + while (q-- > map) + { + if (q[1].hash >= q[0].hash) + continue; + swap(*(q+1), *q); + more = 1; + } + } while(more); +} + +static void dx_insert_block(struct dx_frame *frame, u32 hash, u32 block) +{ + struct dx_entry *entries = frame->entries; + struct dx_entry *old = frame->at, *new = old + 1; + int count = dx_get_count(entries); + + assert(count < dx_get_limit(entries)); + assert(old < entries + count); + memmove(new + 1, new, (char *)(entries + count) - (char *)(new)); + dx_set_hash(new, hash); + dx_set_block(new, block); + dx_set_count(entries, count + 1); +} + +static void ext3_update_dx_flag(struct inode *inode) +{ + if (!EXT3_HAS_COMPAT_FEATURE(inode->i_sb, + EXT3_FEATURE_COMPAT_DIR_INDEX)) + EXT3_I(inode)->i_flags &= ~EXT3_INDEX_FL; +} + +/* + * NOTE! unlike strncmp, ext3_match returns 1 for success, 0 for failure. + * + * `len <= EXT3_NAME_LEN' is guaranteed by caller. + * `de != NULL' is guaranteed by caller. + */ +static inline int ext3_match (int len, const char * const name, + struct ext3_dir_entry_2 * de) +{ + if (len != de->name_len) + return 0; + if (!de->inode) + return 0; + return !memcmp(name, de->name, len); +} + +/* + * Returns 0 if not found, -1 on failure, and 1 on success + */ +static inline int search_dirblock(struct buffer_head * bh, + struct inode *dir, + struct qstr *child, + unsigned long offset, + struct ext3_dir_entry_2 ** res_dir) +{ + struct ext3_dir_entry_2 * de; + char * dlimit; + int de_len; + const char *name = child->name; + int namelen = child->len; + + de = (struct ext3_dir_entry_2 *) bh->b_data; + dlimit = bh->b_data + dir->i_sb->s_blocksize; + while ((char *) de < dlimit) { + /* this code is executed quadratically often */ + /* do minimal checking `by hand' */ + + if ((char *) de + namelen <= dlimit && + ext3_match (namelen, name, de)) { + /* found a match - just to be sure, do a full check */ + if (!ext3_check_dir_entry("ext3_find_entry", + dir, de, bh, offset)) + return -1; + *res_dir = de; + return 1; + } + /* prevent looping on a bad block */ + de_len = ext3_rec_len_from_disk(de->rec_len); + if (de_len <= 0) + return -1; + offset += de_len; + de = (struct ext3_dir_entry_2 *) ((char *) de + de_len); + } + return 0; +} + + +/* + * ext3_find_entry() + * + * finds an entry in the specified directory with the wanted name. It + * returns the cache buffer in which the entry was found, and the entry + * itself (as a parameter - res_dir). It does NOT read the inode of the + * entry - you'll have to do that yourself if you want to. + * + * The returned buffer_head has ->b_count elevated. The caller is expected + * to brelse() it when appropriate. + */ +static struct buffer_head *ext3_find_entry(struct inode *dir, + struct qstr *entry, + struct ext3_dir_entry_2 **res_dir) +{ + struct super_block * sb; + struct buffer_head * bh_use[NAMEI_RA_SIZE]; + struct buffer_head * bh, *ret = NULL; + unsigned long start, block, b; + const u8 *name = entry->name; + int ra_max = 0; /* Number of bh's in the readahead + buffer, bh_use[] */ + int ra_ptr = 0; /* Current index into readahead + buffer */ + int num = 0; + int nblocks, i, err; + int namelen; + + *res_dir = NULL; + sb = dir->i_sb; + namelen = entry->len; + if (namelen > EXT3_NAME_LEN) + return NULL; + if ((namelen <= 2) && (name[0] == '.') && + (name[1] == '.' || name[1] == 0)) { + /* + * "." or ".." will only be in the first block + * NFS may look up ".."; "." should be handled by the VFS + */ + block = start = 0; + nblocks = 1; + goto restart; + } + if (is_dx(dir)) { + bh = ext3_dx_find_entry(dir, entry, res_dir, &err); + /* + * On success, or if the error was file not found, + * return. Otherwise, fall back to doing a search the + * old fashioned way. + */ + if (bh || (err != ERR_BAD_DX_DIR)) + return bh; + dxtrace(printk("ext3_find_entry: dx failed, falling back\n")); + } + nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb); + start = EXT3_I(dir)->i_dir_start_lookup; + if (start >= nblocks) + start = 0; + block = start; +restart: + do { + /* + * We deal with the read-ahead logic here. + */ + if (ra_ptr >= ra_max) { + /* Refill the readahead buffer */ + ra_ptr = 0; + b = block; + for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { + /* + * Terminate if we reach the end of the + * directory and must wrap, or if our + * search has finished at this block. + */ + if (b >= nblocks || (num && block == start)) { + bh_use[ra_max] = NULL; + break; + } + num++; + bh = ext3_getblk(NULL, dir, b++, 0, &err); + bh_use[ra_max] = bh; + if (bh && !bh_uptodate_or_lock(bh)) { + get_bh(bh); + bh->b_end_io = end_buffer_read_sync; + submit_bh(READ | REQ_META | REQ_PRIO, + bh); + } + } + } + if ((bh = bh_use[ra_ptr++]) == NULL) + goto next; + wait_on_buffer(bh); + if (!buffer_uptodate(bh)) { + /* read error, skip block & hope for the best */ + ext3_error(sb, __func__, "reading directory #%lu " + "offset %lu", dir->i_ino, block); + brelse(bh); + goto next; + } + i = search_dirblock(bh, dir, entry, + block << EXT3_BLOCK_SIZE_BITS(sb), res_dir); + if (i == 1) { + EXT3_I(dir)->i_dir_start_lookup = block; + ret = bh; + goto cleanup_and_exit; + } else { + brelse(bh); + if (i < 0) + goto cleanup_and_exit; + } + next: + if (++block >= nblocks) + block = 0; + } while (block != start); + + /* + * If the directory has grown while we were searching, then + * search the last part of the directory before giving up. + */ + block = nblocks; + nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb); + if (block < nblocks) { + start = 0; + goto restart; + } + +cleanup_and_exit: + /* Clean up the read-ahead blocks */ + for (; ra_ptr < ra_max; ra_ptr++) + brelse (bh_use[ra_ptr]); + return ret; +} + +static struct buffer_head * ext3_dx_find_entry(struct inode *dir, + struct qstr *entry, struct ext3_dir_entry_2 **res_dir, + int *err) +{ + struct super_block *sb = dir->i_sb; + struct dx_hash_info hinfo; + struct dx_frame frames[2], *frame; + struct buffer_head *bh; + unsigned long block; + int retval; + + if (!(frame = dx_probe(entry, dir, &hinfo, frames, err))) + return NULL; + do { + block = dx_get_block(frame->at); + if (!(bh = ext3_dir_bread (NULL, dir, block, 0, err))) + goto errout; + + retval = search_dirblock(bh, dir, entry, + block << EXT3_BLOCK_SIZE_BITS(sb), + res_dir); + if (retval == 1) { + dx_release(frames); + return bh; + } + brelse(bh); + if (retval == -1) { + *err = ERR_BAD_DX_DIR; + goto errout; + } + + /* Check to see if we should continue to search */ + retval = ext3_htree_next_block(dir, hinfo.hash, frame, + frames, NULL); + if (retval < 0) { + ext3_warning(sb, __func__, + "error reading index page in directory #%lu", + dir->i_ino); + *err = retval; + goto errout; + } + } while (retval == 1); + + *err = -ENOENT; +errout: + dxtrace(printk("%s not found\n", entry->name)); + dx_release (frames); + return NULL; +} + +static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) +{ + struct inode * inode; + struct ext3_dir_entry_2 * de; + struct buffer_head * bh; + + if (dentry->d_name.len > EXT3_NAME_LEN) + return ERR_PTR(-ENAMETOOLONG); + + bh = ext3_find_entry(dir, &dentry->d_name, &de); + inode = NULL; + if (bh) { + unsigned long ino = le32_to_cpu(de->inode); + brelse (bh); + if (!ext3_valid_inum(dir->i_sb, ino)) { + ext3_error(dir->i_sb, "ext3_lookup", + "bad inode number: %lu", ino); + return ERR_PTR(-EIO); + } + inode = ext3_iget(dir->i_sb, ino); + if (inode == ERR_PTR(-ESTALE)) { + ext3_error(dir->i_sb, __func__, + "deleted inode referenced: %lu", + ino); + return ERR_PTR(-EIO); + } + } + return d_splice_alias(inode, dentry); +} + + +struct dentry *ext3_get_parent(struct dentry *child) +{ + unsigned long ino; + struct qstr dotdot = QSTR_INIT("..", 2); + struct ext3_dir_entry_2 * de; + struct buffer_head *bh; + + bh = ext3_find_entry(d_inode(child), &dotdot, &de); + if (!bh) + return ERR_PTR(-ENOENT); + ino = le32_to_cpu(de->inode); + brelse(bh); + + if (!ext3_valid_inum(d_inode(child)->i_sb, ino)) { + ext3_error(d_inode(child)->i_sb, "ext3_get_parent", + "bad inode number: %lu", ino); + return ERR_PTR(-EIO); + } + + return d_obtain_alias(ext3_iget(d_inode(child)->i_sb, ino)); +} + +#define S_SHIFT 12 +static unsigned char ext3_type_by_mode[S_IFMT >> S_SHIFT] = { + [S_IFREG >> S_SHIFT] = EXT3_FT_REG_FILE, + [S_IFDIR >> S_SHIFT] = EXT3_FT_DIR, + [S_IFCHR >> S_SHIFT] = EXT3_FT_CHRDEV, + [S_IFBLK >> S_SHIFT] = EXT3_FT_BLKDEV, + [S_IFIFO >> S_SHIFT] = EXT3_FT_FIFO, + [S_IFSOCK >> S_SHIFT] = EXT3_FT_SOCK, + [S_IFLNK >> S_SHIFT] = EXT3_FT_SYMLINK, +}; + +static inline void ext3_set_de_type(struct super_block *sb, + struct ext3_dir_entry_2 *de, + umode_t mode) { + if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_FILETYPE)) + de->file_type = ext3_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; +} + +/* + * Move count entries from end of map between two memory locations. + * Returns pointer to last entry moved. + */ +static struct ext3_dir_entry_2 * +dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count) +{ + unsigned rec_len = 0; + + while (count--) { + struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *) (from + map->offs); + rec_len = EXT3_DIR_REC_LEN(de->name_len); + memcpy (to, de, rec_len); + ((struct ext3_dir_entry_2 *) to)->rec_len = + ext3_rec_len_to_disk(rec_len); + de->inode = 0; + map++; + to += rec_len; + } + return (struct ext3_dir_entry_2 *) (to - rec_len); +} + +/* + * Compact each dir entry in the range to the minimal rec_len. + * Returns pointer to last entry in range. + */ +static struct ext3_dir_entry_2 *dx_pack_dirents(char *base, unsigned blocksize) +{ + struct ext3_dir_entry_2 *next, *to, *prev; + struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *)base; + unsigned rec_len = 0; + + prev = to = de; + while ((char *)de < base + blocksize) { + next = ext3_next_entry(de); + if (de->inode && de->name_len) { + rec_len = EXT3_DIR_REC_LEN(de->name_len); + if (de > to) + memmove(to, de, rec_len); + to->rec_len = ext3_rec_len_to_disk(rec_len); + prev = to; + to = (struct ext3_dir_entry_2 *) (((char *) to) + rec_len); + } + de = next; + } + return prev; +} + +/* + * Split a full leaf block to make room for a new dir entry. + * Allocate a new block, and move entries so that they are approx. equally full. + * Returns pointer to de in block into which the new entry will be inserted. + */ +static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir, + struct buffer_head **bh,struct dx_frame *frame, + struct dx_hash_info *hinfo, int *error) +{ + unsigned blocksize = dir->i_sb->s_blocksize; + unsigned count, continued; + struct buffer_head *bh2; + u32 newblock; + u32 hash2; + struct dx_map_entry *map; + char *data1 = (*bh)->b_data, *data2; + unsigned split, move, size; + struct ext3_dir_entry_2 *de = NULL, *de2; + int err = 0, i; + + bh2 = ext3_append (handle, dir, &newblock, &err); + if (!(bh2)) { + brelse(*bh); + *bh = NULL; + goto errout; + } + + BUFFER_TRACE(*bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, *bh); + if (err) + goto journal_error; + + BUFFER_TRACE(frame->bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, frame->bh); + if (err) + goto journal_error; + + data2 = bh2->b_data; + + /* create map in the end of data2 block */ + map = (struct dx_map_entry *) (data2 + blocksize); + count = dx_make_map ((struct ext3_dir_entry_2 *) data1, + blocksize, hinfo, map); + map -= count; + dx_sort_map (map, count); + /* Split the existing block in the middle, size-wise */ + size = 0; + move = 0; + for (i = count-1; i >= 0; i--) { + /* is more than half of this entry in 2nd half of the block? */ + if (size + map[i].size/2 > blocksize/2) + break; + size += map[i].size; + move++; + } + /* map index at which we will split */ + split = count - move; + hash2 = map[split].hash; + continued = hash2 == map[split - 1].hash; + dxtrace(printk("Split block %i at %x, %i/%i\n", + dx_get_block(frame->at), hash2, split, count-split)); + + /* Fancy dance to stay within two buffers */ + de2 = dx_move_dirents(data1, data2, map + split, count - split); + de = dx_pack_dirents(data1,blocksize); + de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de); + de2->rec_len = ext3_rec_len_to_disk(data2 + blocksize - (char *) de2); + dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data1, blocksize, 1)); + dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data2, blocksize, 1)); + + /* Which block gets the new entry? */ + if (hinfo->hash >= hash2) + { + swap(*bh, bh2); + de = de2; + } + dx_insert_block (frame, hash2 + continued, newblock); + err = ext3_journal_dirty_metadata (handle, bh2); + if (err) + goto journal_error; + err = ext3_journal_dirty_metadata (handle, frame->bh); + if (err) + goto journal_error; + brelse (bh2); + dxtrace(dx_show_index ("frame", frame->entries)); + return de; + +journal_error: + brelse(*bh); + brelse(bh2); + *bh = NULL; + ext3_std_error(dir->i_sb, err); +errout: + *error = err; + return NULL; +} + + +/* + * Add a new entry into a directory (leaf) block. If de is non-NULL, + * it points to a directory entry which is guaranteed to be large + * enough for new directory entry. If de is NULL, then + * add_dirent_to_buf will attempt search the directory block for + * space. It will return -ENOSPC if no space is available, and -EIO + * and -EEXIST if directory entry already exists. + * + * NOTE! bh is NOT released in the case where ENOSPC is returned. In + * all other cases bh is released. + */ +static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry, + struct inode *inode, struct ext3_dir_entry_2 *de, + struct buffer_head * bh) +{ + struct inode *dir = d_inode(dentry->d_parent); + const char *name = dentry->d_name.name; + int namelen = dentry->d_name.len; + unsigned long offset = 0; + unsigned short reclen; + int nlen, rlen, err; + char *top; + + reclen = EXT3_DIR_REC_LEN(namelen); + if (!de) { + de = (struct ext3_dir_entry_2 *)bh->b_data; + top = bh->b_data + dir->i_sb->s_blocksize - reclen; + while ((char *) de <= top) { + if (!ext3_check_dir_entry("ext3_add_entry", dir, de, + bh, offset)) { + brelse (bh); + return -EIO; + } + if (ext3_match (namelen, name, de)) { + brelse (bh); + return -EEXIST; + } + nlen = EXT3_DIR_REC_LEN(de->name_len); + rlen = ext3_rec_len_from_disk(de->rec_len); + if ((de->inode? rlen - nlen: rlen) >= reclen) + break; + de = (struct ext3_dir_entry_2 *)((char *)de + rlen); + offset += rlen; + } + if ((char *) de > top) + return -ENOSPC; + } + BUFFER_TRACE(bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, bh); + if (err) { + ext3_std_error(dir->i_sb, err); + brelse(bh); + return err; + } + + /* By now the buffer is marked for journaling */ + nlen = EXT3_DIR_REC_LEN(de->name_len); + rlen = ext3_rec_len_from_disk(de->rec_len); + if (de->inode) { + struct ext3_dir_entry_2 *de1 = (struct ext3_dir_entry_2 *)((char *)de + nlen); + de1->rec_len = ext3_rec_len_to_disk(rlen - nlen); + de->rec_len = ext3_rec_len_to_disk(nlen); + de = de1; + } + de->file_type = EXT3_FT_UNKNOWN; + if (inode) { + de->inode = cpu_to_le32(inode->i_ino); + ext3_set_de_type(dir->i_sb, de, inode->i_mode); + } else + de->inode = 0; + de->name_len = namelen; + memcpy (de->name, name, namelen); + /* + * XXX shouldn't update any times until successful + * completion of syscall, but too many callers depend + * on this. + * + * XXX similarly, too many callers depend on + * ext3_new_inode() setting the times, but error + * recovery deletes the inode, so the worst that can + * happen is that the times are slightly out of date + * and/or different from the directory change time. + */ + dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; + ext3_update_dx_flag(dir); + dir->i_version++; + ext3_mark_inode_dirty(handle, dir); + BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); + err = ext3_journal_dirty_metadata(handle, bh); + if (err) + ext3_std_error(dir->i_sb, err); + brelse(bh); + return 0; +} + +/* + * This converts a one block unindexed directory to a 3 block indexed + * directory, and adds the dentry to the indexed directory. + */ +static int make_indexed_dir(handle_t *handle, struct dentry *dentry, + struct inode *inode, struct buffer_head *bh) +{ + struct inode *dir = d_inode(dentry->d_parent); + const char *name = dentry->d_name.name; + int namelen = dentry->d_name.len; + struct buffer_head *bh2; + struct dx_root *root; + struct dx_frame frames[2], *frame; + struct dx_entry *entries; + struct ext3_dir_entry_2 *de, *de2; + char *data1, *top; + unsigned len; + int retval; + unsigned blocksize; + struct dx_hash_info hinfo; + u32 block; + struct fake_dirent *fde; + + blocksize = dir->i_sb->s_blocksize; + dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino)); + retval = ext3_journal_get_write_access(handle, bh); + if (retval) { + ext3_std_error(dir->i_sb, retval); + brelse(bh); + return retval; + } + root = (struct dx_root *) bh->b_data; + + /* The 0th block becomes the root, move the dirents out */ + fde = &root->dotdot; + de = (struct ext3_dir_entry_2 *)((char *)fde + + ext3_rec_len_from_disk(fde->rec_len)); + if ((char *) de >= (((char *) root) + blocksize)) { + ext3_error(dir->i_sb, __func__, + "invalid rec_len for '..' in inode %lu", + dir->i_ino); + brelse(bh); + return -EIO; + } + len = ((char *) root) + blocksize - (char *) de; + + bh2 = ext3_append (handle, dir, &block, &retval); + if (!(bh2)) { + brelse(bh); + return retval; + } + EXT3_I(dir)->i_flags |= EXT3_INDEX_FL; + data1 = bh2->b_data; + + memcpy (data1, de, len); + de = (struct ext3_dir_entry_2 *) data1; + top = data1 + len; + while ((char *)(de2 = ext3_next_entry(de)) < top) + de = de2; + de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de); + /* Initialize the root; the dot dirents already exist */ + de = (struct ext3_dir_entry_2 *) (&root->dotdot); + de->rec_len = ext3_rec_len_to_disk(blocksize - EXT3_DIR_REC_LEN(2)); + memset (&root->info, 0, sizeof(root->info)); + root->info.info_length = sizeof(root->info); + root->info.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version; + entries = root->entries; + dx_set_block (entries, 1); + dx_set_count (entries, 1); + dx_set_limit (entries, dx_root_limit(dir, sizeof(root->info))); + + /* Initialize as for dx_probe */ + hinfo.hash_version = root->info.hash_version; + if (hinfo.hash_version <= DX_HASH_TEA) + hinfo.hash_version += EXT3_SB(dir->i_sb)->s_hash_unsigned; + hinfo.seed = EXT3_SB(dir->i_sb)->s_hash_seed; + ext3fs_dirhash(name, namelen, &hinfo); + frame = frames; + frame->entries = entries; + frame->at = entries; + frame->bh = bh; + bh = bh2; + /* + * Mark buffers dirty here so that if do_split() fails we write a + * consistent set of buffers to disk. + */ + ext3_journal_dirty_metadata(handle, frame->bh); + ext3_journal_dirty_metadata(handle, bh); + de = do_split(handle,dir, &bh, frame, &hinfo, &retval); + if (!de) { + ext3_mark_inode_dirty(handle, dir); + dx_release(frames); + return retval; + } + dx_release(frames); + + return add_dirent_to_buf(handle, dentry, inode, de, bh); +} + +/* + * ext3_add_entry() + * + * adds a file entry to the specified directory, using the same + * semantics as ext3_find_entry(). It returns NULL if it failed. + * + * NOTE!! The inode part of 'de' is left at 0 - which means you + * may not sleep between calling this and putting something into + * the entry, as someone else might have used it while you slept. + */ +static int ext3_add_entry (handle_t *handle, struct dentry *dentry, + struct inode *inode) +{ + struct inode *dir = d_inode(dentry->d_parent); + struct buffer_head * bh; + struct ext3_dir_entry_2 *de; + struct super_block * sb; + int retval; + int dx_fallback=0; + unsigned blocksize; + u32 block, blocks; + + sb = dir->i_sb; + blocksize = sb->s_blocksize; + if (!dentry->d_name.len) + return -EINVAL; + if (is_dx(dir)) { + retval = ext3_dx_add_entry(handle, dentry, inode); + if (!retval || (retval != ERR_BAD_DX_DIR)) + return retval; + EXT3_I(dir)->i_flags &= ~EXT3_INDEX_FL; + dx_fallback++; + ext3_mark_inode_dirty(handle, dir); + } + blocks = dir->i_size >> sb->s_blocksize_bits; + for (block = 0; block < blocks; block++) { + if (!(bh = ext3_dir_bread(handle, dir, block, 0, &retval))) + return retval; + + retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh); + if (retval != -ENOSPC) + return retval; + + if (blocks == 1 && !dx_fallback && + EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_DIR_INDEX)) + return make_indexed_dir(handle, dentry, inode, bh); + brelse(bh); + } + bh = ext3_append(handle, dir, &block, &retval); + if (!bh) + return retval; + de = (struct ext3_dir_entry_2 *) bh->b_data; + de->inode = 0; + de->rec_len = ext3_rec_len_to_disk(blocksize); + return add_dirent_to_buf(handle, dentry, inode, de, bh); +} + +/* + * Returns 0 for success, or a negative error value + */ +static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry, + struct inode *inode) +{ + struct dx_frame frames[2], *frame; + struct dx_entry *entries, *at; + struct dx_hash_info hinfo; + struct buffer_head * bh; + struct inode *dir = d_inode(dentry->d_parent); + struct super_block * sb = dir->i_sb; + struct ext3_dir_entry_2 *de; + int err; + + frame = dx_probe(&dentry->d_name, dir, &hinfo, frames, &err); + if (!frame) + return err; + entries = frame->entries; + at = frame->at; + + if (!(bh = ext3_dir_bread(handle, dir, dx_get_block(frame->at), 0, &err))) + goto cleanup; + + BUFFER_TRACE(bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, bh); + if (err) + goto journal_error; + + err = add_dirent_to_buf(handle, dentry, inode, NULL, bh); + if (err != -ENOSPC) { + bh = NULL; + goto cleanup; + } + + /* Block full, should compress but for now just split */ + dxtrace(printk("using %u of %u node entries\n", + dx_get_count(entries), dx_get_limit(entries))); + /* Need to split index? */ + if (dx_get_count(entries) == dx_get_limit(entries)) { + u32 newblock; + unsigned icount = dx_get_count(entries); + int levels = frame - frames; + struct dx_entry *entries2; + struct dx_node *node2; + struct buffer_head *bh2; + + if (levels && (dx_get_count(frames->entries) == + dx_get_limit(frames->entries))) { + ext3_warning(sb, __func__, + "Directory index full!"); + err = -ENOSPC; + goto cleanup; + } + bh2 = ext3_append (handle, dir, &newblock, &err); + if (!(bh2)) + goto cleanup; + node2 = (struct dx_node *)(bh2->b_data); + entries2 = node2->entries; + memset(&node2->fake, 0, sizeof(struct fake_dirent)); + node2->fake.rec_len = ext3_rec_len_to_disk(sb->s_blocksize); + BUFFER_TRACE(frame->bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, frame->bh); + if (err) + goto journal_error; + if (levels) { + unsigned icount1 = icount/2, icount2 = icount - icount1; + unsigned hash2 = dx_get_hash(entries + icount1); + dxtrace(printk("Split index %i/%i\n", icount1, icount2)); + + BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */ + err = ext3_journal_get_write_access(handle, + frames[0].bh); + if (err) + goto journal_error; + + memcpy ((char *) entries2, (char *) (entries + icount1), + icount2 * sizeof(struct dx_entry)); + dx_set_count (entries, icount1); + dx_set_count (entries2, icount2); + dx_set_limit (entries2, dx_node_limit(dir)); + + /* Which index block gets the new entry? */ + if (at - entries >= icount1) { + frame->at = at = at - entries - icount1 + entries2; + frame->entries = entries = entries2; + swap(frame->bh, bh2); + } + dx_insert_block (frames + 0, hash2, newblock); + dxtrace(dx_show_index ("node", frames[1].entries)); + dxtrace(dx_show_index ("node", + ((struct dx_node *) bh2->b_data)->entries)); + err = ext3_journal_dirty_metadata(handle, bh2); + if (err) + goto journal_error; + brelse (bh2); + } else { + dxtrace(printk("Creating second level index...\n")); + memcpy((char *) entries2, (char *) entries, + icount * sizeof(struct dx_entry)); + dx_set_limit(entries2, dx_node_limit(dir)); + + /* Set up root */ + dx_set_count(entries, 1); + dx_set_block(entries + 0, newblock); + ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1; + + /* Add new access path frame */ + frame = frames + 1; + frame->at = at = at - entries + entries2; + frame->entries = entries = entries2; + frame->bh = bh2; + err = ext3_journal_get_write_access(handle, + frame->bh); + if (err) + goto journal_error; + } + err = ext3_journal_dirty_metadata(handle, frames[0].bh); + if (err) + goto journal_error; + } + de = do_split(handle, dir, &bh, frame, &hinfo, &err); + if (!de) + goto cleanup; + err = add_dirent_to_buf(handle, dentry, inode, de, bh); + bh = NULL; + goto cleanup; + +journal_error: + ext3_std_error(dir->i_sb, err); +cleanup: + if (bh) + brelse(bh); + dx_release(frames); + return err; +} + +/* + * ext3_delete_entry deletes a directory entry by merging it with the + * previous entry + */ +static int ext3_delete_entry (handle_t *handle, + struct inode * dir, + struct ext3_dir_entry_2 * de_del, + struct buffer_head * bh) +{ + struct ext3_dir_entry_2 * de, * pde; + int i; + + i = 0; + pde = NULL; + de = (struct ext3_dir_entry_2 *) bh->b_data; + while (i < bh->b_size) { + if (!ext3_check_dir_entry("ext3_delete_entry", dir, de, bh, i)) + return -EIO; + if (de == de_del) { + int err; + + BUFFER_TRACE(bh, "get_write_access"); + err = ext3_journal_get_write_access(handle, bh); + if (err) + goto journal_error; + + if (pde) + pde->rec_len = ext3_rec_len_to_disk( + ext3_rec_len_from_disk(pde->rec_len) + + ext3_rec_len_from_disk(de->rec_len)); + else + de->inode = 0; + dir->i_version++; + BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); + err = ext3_journal_dirty_metadata(handle, bh); + if (err) { +journal_error: + ext3_std_error(dir->i_sb, err); + return err; + } + return 0; + } + i += ext3_rec_len_from_disk(de->rec_len); + pde = de; + de = ext3_next_entry(de); + } + return -ENOENT; +} + +static int ext3_add_nondir(handle_t *handle, + struct dentry *dentry, struct inode *inode) +{ + int err = ext3_add_entry(handle, dentry, inode); + if (!err) { + ext3_mark_inode_dirty(handle, inode); + unlock_new_inode(inode); + d_instantiate(dentry, inode); + return 0; + } + drop_nlink(inode); + unlock_new_inode(inode); + iput(inode); + return err; +} + +/* + * By the time this is called, we already have created + * the directory cache entry for the new file, but it + * is so far negative - it has no inode. + * + * If the create succeeds, we fill in the inode information + * with d_instantiate(). + */ +static int ext3_create (struct inode * dir, struct dentry * dentry, umode_t mode, + bool excl) +{ + handle_t *handle; + struct inode * inode; + int err, retries = 0; + + dquot_initialize(dir); + +retry: + handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) + + EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 + + EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + if (IS_DIRSYNC(dir)) + handle->h_sync = 1; + + inode = ext3_new_inode (handle, dir, &dentry->d_name, mode); + err = PTR_ERR(inode); + if (!IS_ERR(inode)) { + inode->i_op = &ext3_file_inode_operations; + inode->i_fop = &ext3_file_operations; + ext3_set_aops(inode); + err = ext3_add_nondir(handle, dentry, inode); + } + ext3_journal_stop(handle); + if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries)) + goto retry; + return err; +} + +static int ext3_mknod (struct inode * dir, struct dentry *dentry, + umode_t mode, dev_t rdev) +{ + handle_t *handle; + struct inode *inode; + int err, retries = 0; + + if (!new_valid_dev(rdev)) + return -EINVAL; + + dquot_initialize(dir); + +retry: + handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) + + EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 + + EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + if (IS_DIRSYNC(dir)) + handle->h_sync = 1; + + inode = ext3_new_inode (handle, dir, &dentry->d_name, mode); + err = PTR_ERR(inode); + if (!IS_ERR(inode)) { + init_special_inode(inode, inode->i_mode, rdev); +#ifdef CONFIG_EXT3_FS_XATTR + inode->i_op = &ext3_special_inode_operations; +#endif + err = ext3_add_nondir(handle, dentry, inode); + } + ext3_journal_stop(handle); + if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries)) + goto retry; + return err; +} + +static int ext3_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) +{ + handle_t *handle; + struct inode *inode; + int err, retries = 0; + + dquot_initialize(dir); + +retry: + handle = ext3_journal_start(dir, EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + + 4 + EXT3_XATTR_TRANS_BLOCKS); + + if (IS_ERR(handle)) + return PTR_ERR(handle); + + inode = ext3_new_inode (handle, dir, NULL, mode); + err = PTR_ERR(inode); + if (!IS_ERR(inode)) { + inode->i_op = &ext3_file_inode_operations; + inode->i_fop = &ext3_file_operations; + ext3_set_aops(inode); + d_tmpfile(dentry, inode); + err = ext3_orphan_add(handle, inode); + if (err) + goto err_unlock_inode; + mark_inode_dirty(inode); + unlock_new_inode(inode); + } + ext3_journal_stop(handle); + if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries)) + goto retry; + return err; +err_unlock_inode: + ext3_journal_stop(handle); + unlock_new_inode(inode); + return err; +} + +static int ext3_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode) +{ + handle_t *handle; + struct inode * inode; + struct buffer_head * dir_block = NULL; + struct ext3_dir_entry_2 * de; + int err, retries = 0; + + if (dir->i_nlink >= EXT3_LINK_MAX) + return -EMLINK; + + dquot_initialize(dir); + +retry: + handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) + + EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 + + EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + if (IS_DIRSYNC(dir)) + handle->h_sync = 1; + + inode = ext3_new_inode (handle, dir, &dentry->d_name, S_IFDIR | mode); + err = PTR_ERR(inode); + if (IS_ERR(inode)) + goto out_stop; + + inode->i_op = &ext3_dir_inode_operations; + inode->i_fop = &ext3_dir_operations; + inode->i_size = EXT3_I(inode)->i_disksize = inode->i_sb->s_blocksize; + if (!(dir_block = ext3_dir_bread(handle, inode, 0, 1, &err))) + goto out_clear_inode; + + BUFFER_TRACE(dir_block, "get_write_access"); + err = ext3_journal_get_write_access(handle, dir_block); + if (err) + goto out_clear_inode; + + de = (struct ext3_dir_entry_2 *) dir_block->b_data; + de->inode = cpu_to_le32(inode->i_ino); + de->name_len = 1; + de->rec_len = ext3_rec_len_to_disk(EXT3_DIR_REC_LEN(de->name_len)); + strcpy (de->name, "."); + ext3_set_de_type(dir->i_sb, de, S_IFDIR); + de = ext3_next_entry(de); + de->inode = cpu_to_le32(dir->i_ino); + de->rec_len = ext3_rec_len_to_disk(inode->i_sb->s_blocksize - + EXT3_DIR_REC_LEN(1)); + de->name_len = 2; + strcpy (de->name, ".."); + ext3_set_de_type(dir->i_sb, de, S_IFDIR); + set_nlink(inode, 2); + BUFFER_TRACE(dir_block, "call ext3_journal_dirty_metadata"); + err = ext3_journal_dirty_metadata(handle, dir_block); + if (err) + goto out_clear_inode; + + err = ext3_mark_inode_dirty(handle, inode); + if (!err) + err = ext3_add_entry (handle, dentry, inode); + + if (err) { +out_clear_inode: + clear_nlink(inode); + unlock_new_inode(inode); + ext3_mark_inode_dirty(handle, inode); + iput (inode); + goto out_stop; + } + inc_nlink(dir); + ext3_update_dx_flag(dir); + err = ext3_mark_inode_dirty(handle, dir); + if (err) + goto out_clear_inode; + + unlock_new_inode(inode); + d_instantiate(dentry, inode); +out_stop: + brelse(dir_block); + ext3_journal_stop(handle); + if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries)) + goto retry; + return err; +} + +/* + * routine to check that the specified directory is empty (for rmdir) + */ +static int empty_dir (struct inode * inode) +{ + unsigned long offset; + struct buffer_head * bh; + struct ext3_dir_entry_2 * de, * de1; + struct super_block * sb; + int err = 0; + + sb = inode->i_sb; + if (inode->i_size < EXT3_DIR_REC_LEN(1) + EXT3_DIR_REC_LEN(2) || + !(bh = ext3_dir_bread(NULL, inode, 0, 0, &err))) { + if (err) + ext3_error(inode->i_sb, __func__, + "error %d reading directory #%lu offset 0", + err, inode->i_ino); + else + ext3_warning(inode->i_sb, __func__, + "bad directory (dir #%lu) - no data block", + inode->i_ino); + return 1; + } + de = (struct ext3_dir_entry_2 *) bh->b_data; + de1 = ext3_next_entry(de); + if (le32_to_cpu(de->inode) != inode->i_ino || + !le32_to_cpu(de1->inode) || + strcmp (".", de->name) || + strcmp ("..", de1->name)) { + ext3_warning (inode->i_sb, "empty_dir", + "bad directory (dir #%lu) - no `.' or `..'", + inode->i_ino); + brelse (bh); + return 1; + } + offset = ext3_rec_len_from_disk(de->rec_len) + + ext3_rec_len_from_disk(de1->rec_len); + de = ext3_next_entry(de1); + while (offset < inode->i_size ) { + if (!bh || + (void *) de >= (void *) (bh->b_data+sb->s_blocksize)) { + err = 0; + brelse (bh); + if (!(bh = ext3_dir_bread (NULL, inode, + offset >> EXT3_BLOCK_SIZE_BITS(sb), 0, &err))) { + if (err) + ext3_error(sb, __func__, + "error %d reading directory" + " #%lu offset %lu", + err, inode->i_ino, offset); + offset += sb->s_blocksize; + continue; + } + de = (struct ext3_dir_entry_2 *) bh->b_data; + } + if (!ext3_check_dir_entry("empty_dir", inode, de, bh, offset)) { + de = (struct ext3_dir_entry_2 *)(bh->b_data + + sb->s_blocksize); + offset = (offset | (sb->s_blocksize - 1)) + 1; + continue; + } + if (le32_to_cpu(de->inode)) { + brelse (bh); + return 0; + } + offset += ext3_rec_len_from_disk(de->rec_len); + de = ext3_next_entry(de); + } + brelse (bh); + return 1; +} + +/* ext3_orphan_add() links an unlinked or truncated inode into a list of + * such inodes, starting at the superblock, in case we crash before the + * file is closed/deleted, or in case the inode truncate spans multiple + * transactions and the last transaction is not recovered after a crash. + * + * At filesystem recovery time, we walk this list deleting unlinked + * inodes and truncating linked inodes in ext3_orphan_cleanup(). + */ +int ext3_orphan_add(handle_t *handle, struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + struct ext3_iloc iloc; + int err = 0, rc; + + mutex_lock(&EXT3_SB(sb)->s_orphan_lock); + if (!list_empty(&EXT3_I(inode)->i_orphan)) + goto out_unlock; + + /* Orphan handling is only valid for files with data blocks + * being truncated, or files being unlinked. */ + + /* @@@ FIXME: Observation from aviro: + * I think I can trigger J_ASSERT in ext3_orphan_add(). We block + * here (on s_orphan_lock), so race with ext3_link() which might bump + * ->i_nlink. For, say it, character device. Not a regular file, + * not a directory, not a symlink and ->i_nlink > 0. + * + * tytso, 4/25/2009: I'm not sure how that could happen; + * shouldn't the fs core protect us from these sort of + * unlink()/link() races? + */ + J_ASSERT ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || + S_ISLNK(inode->i_mode)) || inode->i_nlink == 0); + + BUFFER_TRACE(EXT3_SB(sb)->s_sbh, "get_write_access"); + err = ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh); + if (err) + goto out_unlock; + + err = ext3_reserve_inode_write(handle, inode, &iloc); + if (err) + goto out_unlock; + + /* Insert this inode at the head of the on-disk orphan list... */ + NEXT_ORPHAN(inode) = le32_to_cpu(EXT3_SB(sb)->s_es->s_last_orphan); + EXT3_SB(sb)->s_es->s_last_orphan = cpu_to_le32(inode->i_ino); + err = ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh); + rc = ext3_mark_iloc_dirty(handle, inode, &iloc); + if (!err) + err = rc; + + /* Only add to the head of the in-memory list if all the + * previous operations succeeded. If the orphan_add is going to + * fail (possibly taking the journal offline), we can't risk + * leaving the inode on the orphan list: stray orphan-list + * entries can cause panics at unmount time. + * + * This is safe: on error we're going to ignore the orphan list + * anyway on the next recovery. */ + if (!err) + list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan); + + jbd_debug(4, "superblock will point to %lu\n", inode->i_ino); + jbd_debug(4, "orphan inode %lu will point to %d\n", + inode->i_ino, NEXT_ORPHAN(inode)); +out_unlock: + mutex_unlock(&EXT3_SB(sb)->s_orphan_lock); + ext3_std_error(inode->i_sb, err); + return err; +} + +/* + * ext3_orphan_del() removes an unlinked or truncated inode from the list + * of such inodes stored on disk, because it is finally being cleaned up. + */ +int ext3_orphan_del(handle_t *handle, struct inode *inode) +{ + struct list_head *prev; + struct ext3_inode_info *ei = EXT3_I(inode); + struct ext3_sb_info *sbi; + unsigned long ino_next; + struct ext3_iloc iloc; + int err = 0; + + mutex_lock(&EXT3_SB(inode->i_sb)->s_orphan_lock); + if (list_empty(&ei->i_orphan)) + goto out; + + ino_next = NEXT_ORPHAN(inode); + prev = ei->i_orphan.prev; + sbi = EXT3_SB(inode->i_sb); + + jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino); + + list_del_init(&ei->i_orphan); + + /* If we're on an error path, we may not have a valid + * transaction handle with which to update the orphan list on + * disk, but we still need to remove the inode from the linked + * list in memory. */ + if (!handle) + goto out; + + err = ext3_reserve_inode_write(handle, inode, &iloc); + if (err) + goto out_err; + + if (prev == &sbi->s_orphan) { + jbd_debug(4, "superblock will point to %lu\n", ino_next); + BUFFER_TRACE(sbi->s_sbh, "get_write_access"); + err = ext3_journal_get_write_access(handle, sbi->s_sbh); + if (err) + goto out_brelse; + sbi->s_es->s_last_orphan = cpu_to_le32(ino_next); + err = ext3_journal_dirty_metadata(handle, sbi->s_sbh); + } else { + struct ext3_iloc iloc2; + struct inode *i_prev = + &list_entry(prev, struct ext3_inode_info, i_orphan)->vfs_inode; + + jbd_debug(4, "orphan inode %lu will point to %lu\n", + i_prev->i_ino, ino_next); + err = ext3_reserve_inode_write(handle, i_prev, &iloc2); + if (err) + goto out_brelse; + NEXT_ORPHAN(i_prev) = ino_next; + err = ext3_mark_iloc_dirty(handle, i_prev, &iloc2); + } + if (err) + goto out_brelse; + NEXT_ORPHAN(inode) = 0; + err = ext3_mark_iloc_dirty(handle, inode, &iloc); + +out_err: + ext3_std_error(inode->i_sb, err); +out: + mutex_unlock(&EXT3_SB(inode->i_sb)->s_orphan_lock); + return err; + +out_brelse: + brelse(iloc.bh); + goto out_err; +} + +static int ext3_rmdir (struct inode * dir, struct dentry *dentry) +{ + int retval; + struct inode * inode; + struct buffer_head * bh; + struct ext3_dir_entry_2 * de; + handle_t *handle; + + /* Initialize quotas before so that eventual writes go in + * separate transaction */ + dquot_initialize(dir); + dquot_initialize(d_inode(dentry)); + + handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS(dir->i_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + retval = -ENOENT; + bh = ext3_find_entry(dir, &dentry->d_name, &de); + if (!bh) + goto end_rmdir; + + if (IS_DIRSYNC(dir)) + handle->h_sync = 1; + + inode = d_inode(dentry); + + retval = -EIO; + if (le32_to_cpu(de->inode) != inode->i_ino) + goto end_rmdir; + + retval = -ENOTEMPTY; + if (!empty_dir (inode)) + goto end_rmdir; + + retval = ext3_delete_entry(handle, dir, de, bh); + if (retval) + goto end_rmdir; + if (inode->i_nlink != 2) + ext3_warning (inode->i_sb, "ext3_rmdir", + "empty directory has nlink!=2 (%d)", + inode->i_nlink); + inode->i_version++; + clear_nlink(inode); + /* There's no need to set i_disksize: the fact that i_nlink is + * zero will ensure that the right thing happens during any + * recovery. */ + inode->i_size = 0; + ext3_orphan_add(handle, inode); + inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC; + ext3_mark_inode_dirty(handle, inode); + drop_nlink(dir); + ext3_update_dx_flag(dir); + ext3_mark_inode_dirty(handle, dir); + +end_rmdir: + ext3_journal_stop(handle); + brelse (bh); + return retval; +} + +static int ext3_unlink(struct inode * dir, struct dentry *dentry) +{ + int retval; + struct inode * inode; + struct buffer_head * bh; + struct ext3_dir_entry_2 * de; + handle_t *handle; + + trace_ext3_unlink_enter(dir, dentry); + /* Initialize quotas before so that eventual writes go + * in separate transaction */ + dquot_initialize(dir); + dquot_initialize(d_inode(dentry)); + + handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS(dir->i_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + if (IS_DIRSYNC(dir)) + handle->h_sync = 1; + + retval = -ENOENT; + bh = ext3_find_entry(dir, &dentry->d_name, &de); + if (!bh) + goto end_unlink; + + inode = d_inode(dentry); + + retval = -EIO; + if (le32_to_cpu(de->inode) != inode->i_ino) + goto end_unlink; + + if (!inode->i_nlink) { + ext3_warning (inode->i_sb, "ext3_unlink", + "Deleting nonexistent file (%lu), %d", + inode->i_ino, inode->i_nlink); + set_nlink(inode, 1); + } + retval = ext3_delete_entry(handle, dir, de, bh); + if (retval) + goto end_unlink; + dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC; + ext3_update_dx_flag(dir); + ext3_mark_inode_dirty(handle, dir); + drop_nlink(inode); + if (!inode->i_nlink) + ext3_orphan_add(handle, inode); + inode->i_ctime = dir->i_ctime; + ext3_mark_inode_dirty(handle, inode); + retval = 0; + +end_unlink: + ext3_journal_stop(handle); + brelse (bh); + trace_ext3_unlink_exit(dentry, retval); + return retval; +} + +static int ext3_symlink (struct inode * dir, + struct dentry *dentry, const char * symname) +{ + handle_t *handle; + struct inode * inode; + int l, err, retries = 0; + int credits; + + l = strlen(symname)+1; + if (l > dir->i_sb->s_blocksize) + return -ENAMETOOLONG; + + dquot_initialize(dir); + + if (l > EXT3_N_BLOCKS * 4) { + /* + * For non-fast symlinks, we just allocate inode and put it on + * orphan list in the first transaction => we need bitmap, + * group descriptor, sb, inode block, quota blocks, and + * possibly selinux xattr blocks. + */ + credits = 4 + EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + + EXT3_XATTR_TRANS_BLOCKS; + } else { + /* + * Fast symlink. We have to add entry to directory + * (EXT3_DATA_TRANS_BLOCKS + EXT3_INDEX_EXTRA_TRANS_BLOCKS), + * allocate new inode (bitmap, group descriptor, inode block, + * quota blocks, sb is already counted in previous macros). + */ + credits = EXT3_DATA_TRANS_BLOCKS(dir->i_sb) + + EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 + + EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb); + } +retry: + handle = ext3_journal_start(dir, credits); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + if (IS_DIRSYNC(dir)) + handle->h_sync = 1; + + inode = ext3_new_inode (handle, dir, &dentry->d_name, S_IFLNK|S_IRWXUGO); + err = PTR_ERR(inode); + if (IS_ERR(inode)) + goto out_stop; + + if (l > EXT3_N_BLOCKS * 4) { + inode->i_op = &ext3_symlink_inode_operations; + ext3_set_aops(inode); + /* + * We cannot call page_symlink() with transaction started + * because it calls into ext3_write_begin() which acquires page + * lock which ranks below transaction start (and it can also + * wait for journal commit if we are running out of space). So + * we have to stop transaction now and restart it when symlink + * contents is written. + * + * To keep fs consistent in case of crash, we have to put inode + * to orphan list in the mean time. + */ + drop_nlink(inode); + err = ext3_orphan_add(handle, inode); + ext3_journal_stop(handle); + if (err) + goto err_drop_inode; + err = __page_symlink(inode, symname, l, 1); + if (err) + goto err_drop_inode; + /* + * Now inode is being linked into dir (EXT3_DATA_TRANS_BLOCKS + * + EXT3_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified + */ + handle = ext3_journal_start(dir, + EXT3_DATA_TRANS_BLOCKS(dir->i_sb) + + EXT3_INDEX_EXTRA_TRANS_BLOCKS + 1); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + goto err_drop_inode; + } + set_nlink(inode, 1); + err = ext3_orphan_del(handle, inode); + if (err) { + ext3_journal_stop(handle); + drop_nlink(inode); + goto err_drop_inode; + } + } else { + inode->i_op = &ext3_fast_symlink_inode_operations; + memcpy((char*)&EXT3_I(inode)->i_data,symname,l); + inode->i_size = l-1; + } + EXT3_I(inode)->i_disksize = inode->i_size; + err = ext3_add_nondir(handle, dentry, inode); +out_stop: + ext3_journal_stop(handle); + if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries)) + goto retry; + return err; +err_drop_inode: + unlock_new_inode(inode); + iput(inode); + return err; +} + +static int ext3_link (struct dentry * old_dentry, + struct inode * dir, struct dentry *dentry) +{ + handle_t *handle; + struct inode *inode = d_inode(old_dentry); + int err, retries = 0; + + if (inode->i_nlink >= EXT3_LINK_MAX) + return -EMLINK; + + dquot_initialize(dir); + +retry: + handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) + + EXT3_INDEX_EXTRA_TRANS_BLOCKS + 1); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + if (IS_DIRSYNC(dir)) + handle->h_sync = 1; + + inode->i_ctime = CURRENT_TIME_SEC; + inc_nlink(inode); + ihold(inode); + + err = ext3_add_entry(handle, dentry, inode); + if (!err) { + ext3_mark_inode_dirty(handle, inode); + /* this can happen only for tmpfile being + * linked the first time + */ + if (inode->i_nlink == 1) + ext3_orphan_del(handle, inode); + d_instantiate(dentry, inode); + } else { + drop_nlink(inode); + iput(inode); + } + ext3_journal_stop(handle); + if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries)) + goto retry; + return err; +} + +#define PARENT_INO(buffer) \ + (ext3_next_entry((struct ext3_dir_entry_2 *)(buffer))->inode) + +/* + * Anybody can rename anything with this: the permission checks are left to the + * higher-level routines. + */ +static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry, + struct inode * new_dir,struct dentry *new_dentry) +{ + handle_t *handle; + struct inode * old_inode, * new_inode; + struct buffer_head * old_bh, * new_bh, * dir_bh; + struct ext3_dir_entry_2 * old_de, * new_de; + int retval, flush_file = 0; + + dquot_initialize(old_dir); + dquot_initialize(new_dir); + + old_bh = new_bh = dir_bh = NULL; + + /* Initialize quotas before so that eventual writes go + * in separate transaction */ + if (d_really_is_positive(new_dentry)) + dquot_initialize(d_inode(new_dentry)); + handle = ext3_journal_start(old_dir, 2 * + EXT3_DATA_TRANS_BLOCKS(old_dir->i_sb) + + EXT3_INDEX_EXTRA_TRANS_BLOCKS + 2); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) + handle->h_sync = 1; + + old_bh = ext3_find_entry(old_dir, &old_dentry->d_name, &old_de); + /* + * Check for inode number is _not_ due to possible IO errors. + * We might rmdir the source, keep it as pwd of some process + * and merrily kill the link to whatever was created under the + * same name. Goodbye sticky bit ;-< + */ + old_inode = d_inode(old_dentry); + retval = -ENOENT; + if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino) + goto end_rename; + + new_inode = d_inode(new_dentry); + new_bh = ext3_find_entry(new_dir, &new_dentry->d_name, &new_de); + if (new_bh) { + if (!new_inode) { + brelse (new_bh); + new_bh = NULL; + } + } + if (S_ISDIR(old_inode->i_mode)) { + if (new_inode) { + retval = -ENOTEMPTY; + if (!empty_dir (new_inode)) + goto end_rename; + } + retval = -EIO; + dir_bh = ext3_dir_bread(handle, old_inode, 0, 0, &retval); + if (!dir_bh) + goto end_rename; + if (le32_to_cpu(PARENT_INO(dir_bh->b_data)) != old_dir->i_ino) + goto end_rename; + retval = -EMLINK; + if (!new_inode && new_dir!=old_dir && + new_dir->i_nlink >= EXT3_LINK_MAX) + goto end_rename; + } + if (!new_bh) { + retval = ext3_add_entry (handle, new_dentry, old_inode); + if (retval) + goto end_rename; + } else { + BUFFER_TRACE(new_bh, "get write access"); + retval = ext3_journal_get_write_access(handle, new_bh); + if (retval) + goto journal_error; + new_de->inode = cpu_to_le32(old_inode->i_ino); + if (EXT3_HAS_INCOMPAT_FEATURE(new_dir->i_sb, + EXT3_FEATURE_INCOMPAT_FILETYPE)) + new_de->file_type = old_de->file_type; + new_dir->i_version++; + new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME_SEC; + ext3_mark_inode_dirty(handle, new_dir); + BUFFER_TRACE(new_bh, "call ext3_journal_dirty_metadata"); + retval = ext3_journal_dirty_metadata(handle, new_bh); + if (retval) + goto journal_error; + brelse(new_bh); + new_bh = NULL; + } + + /* + * Like most other Unix systems, set the ctime for inodes on a + * rename. + */ + old_inode->i_ctime = CURRENT_TIME_SEC; + ext3_mark_inode_dirty(handle, old_inode); + + /* + * ok, that's it + */ + if (le32_to_cpu(old_de->inode) != old_inode->i_ino || + old_de->name_len != old_dentry->d_name.len || + strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) || + (retval = ext3_delete_entry(handle, old_dir, + old_de, old_bh)) == -ENOENT) { + /* old_de could have moved from under us during htree split, so + * make sure that we are deleting the right entry. We might + * also be pointing to a stale entry in the unused part of + * old_bh so just checking inum and the name isn't enough. */ + struct buffer_head *old_bh2; + struct ext3_dir_entry_2 *old_de2; + + old_bh2 = ext3_find_entry(old_dir, &old_dentry->d_name, + &old_de2); + if (old_bh2) { + retval = ext3_delete_entry(handle, old_dir, + old_de2, old_bh2); + brelse(old_bh2); + } + } + if (retval) { + ext3_warning(old_dir->i_sb, "ext3_rename", + "Deleting old file (%lu), %d, error=%d", + old_dir->i_ino, old_dir->i_nlink, retval); + } + + if (new_inode) { + drop_nlink(new_inode); + new_inode->i_ctime = CURRENT_TIME_SEC; + } + old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC; + ext3_update_dx_flag(old_dir); + if (dir_bh) { + BUFFER_TRACE(dir_bh, "get_write_access"); + retval = ext3_journal_get_write_access(handle, dir_bh); + if (retval) + goto journal_error; + PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino); + BUFFER_TRACE(dir_bh, "call ext3_journal_dirty_metadata"); + retval = ext3_journal_dirty_metadata(handle, dir_bh); + if (retval) { +journal_error: + ext3_std_error(new_dir->i_sb, retval); + goto end_rename; + } + drop_nlink(old_dir); + if (new_inode) { + drop_nlink(new_inode); + } else { + inc_nlink(new_dir); + ext3_update_dx_flag(new_dir); + ext3_mark_inode_dirty(handle, new_dir); + } + } + ext3_mark_inode_dirty(handle, old_dir); + if (new_inode) { + ext3_mark_inode_dirty(handle, new_inode); + if (!new_inode->i_nlink) + ext3_orphan_add(handle, new_inode); + if (ext3_should_writeback_data(new_inode)) + flush_file = 1; + } + retval = 0; + +end_rename: + brelse (dir_bh); + brelse (old_bh); + brelse (new_bh); + ext3_journal_stop(handle); + if (retval == 0 && flush_file) + filemap_flush(old_inode->i_mapping); + return retval; +} + +/* + * directories can handle most operations... + */ +const struct inode_operations ext3_dir_inode_operations = { + .create = ext3_create, + .lookup = ext3_lookup, + .link = ext3_link, + .unlink = ext3_unlink, + .symlink = ext3_symlink, + .mkdir = ext3_mkdir, + .rmdir = ext3_rmdir, + .mknod = ext3_mknod, + .tmpfile = ext3_tmpfile, + .rename = ext3_rename, + .setattr = ext3_setattr, +#ifdef CONFIG_EXT3_FS_XATTR + .setxattr = generic_setxattr, + .getxattr = generic_getxattr, + .listxattr = ext3_listxattr, + .removexattr = generic_removexattr, +#endif + .get_acl = ext3_get_acl, + .set_acl = ext3_set_acl, +}; + +const struct inode_operations ext3_special_inode_operations = { + .setattr = ext3_setattr, +#ifdef CONFIG_EXT3_FS_XATTR + .setxattr = generic_setxattr, + .getxattr = generic_getxattr, + .listxattr = ext3_listxattr, + .removexattr = generic_removexattr, +#endif + .get_acl = ext3_get_acl, + .set_acl = ext3_set_acl, +}; diff --git a/kernel/fs/ext3/namei.h b/kernel/fs/ext3/namei.h new file mode 100644 index 000000000..46304d8c9 --- /dev/null +++ b/kernel/fs/ext3/namei.h @@ -0,0 +1,27 @@ +/* linux/fs/ext3/namei.h + * + * Copyright (C) 2005 Simtec Electronics + * Ben Dooks + * +*/ + +extern struct dentry *ext3_get_parent(struct dentry *child); + +static inline struct buffer_head *ext3_dir_bread(handle_t *handle, + struct inode *inode, + int block, int create, + int *err) +{ + struct buffer_head *bh; + + bh = ext3_bread(handle, inode, block, create, err); + + if (!bh && !(*err)) { + *err = -EIO; + ext3_error(inode->i_sb, __func__, + "Directory hole detected on inode %lu\n", + inode->i_ino); + return NULL; + } + return bh; +} diff --git a/kernel/fs/ext3/resize.c b/kernel/fs/ext3/resize.c new file mode 100644 index 000000000..271056555 --- /dev/null +++ b/kernel/fs/ext3/resize.c @@ -0,0 +1,1117 @@ +/* + * linux/fs/ext3/resize.c + * + * Support for resizing an ext3 filesystem while it is mounted. + * + * Copyright (C) 2001, 2002 Andreas Dilger + * + * This could probably be made into a module, because it is not often in use. + */ + + +#define EXT3FS_DEBUG + +#include "ext3.h" + + +#define outside(b, first, last) ((b) < (first) || (b) >= (last)) +#define inside(b, first, last) ((b) >= (first) && (b) < (last)) + +static int verify_group_input(struct super_block *sb, + struct ext3_new_group_data *input) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + struct ext3_super_block *es = sbi->s_es; + ext3_fsblk_t start = le32_to_cpu(es->s_blocks_count); + ext3_fsblk_t end = start + input->blocks_count; + unsigned group = input->group; + ext3_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; + unsigned overhead = ext3_bg_has_super(sb, group) ? + (1 + ext3_bg_num_gdb(sb, group) + + le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; + ext3_fsblk_t metaend = start + overhead; + struct buffer_head *bh = NULL; + ext3_grpblk_t free_blocks_count; + int err = -EINVAL; + + input->free_blocks_count = free_blocks_count = + input->blocks_count - 2 - overhead - sbi->s_itb_per_group; + + if (test_opt(sb, DEBUG)) + printk(KERN_DEBUG "EXT3-fs: adding %s group %u: %u blocks " + "(%d free, %u reserved)\n", + ext3_bg_has_super(sb, input->group) ? "normal" : + "no-super", input->group, input->blocks_count, + free_blocks_count, input->reserved_blocks); + + if (group != sbi->s_groups_count) + ext3_warning(sb, __func__, + "Cannot add at group %u (only %lu groups)", + input->group, sbi->s_groups_count); + else if ((start - le32_to_cpu(es->s_first_data_block)) % + EXT3_BLOCKS_PER_GROUP(sb)) + ext3_warning(sb, __func__, "Last group not full"); + else if (input->reserved_blocks > input->blocks_count / 5) + ext3_warning(sb, __func__, "Reserved blocks too high (%u)", + input->reserved_blocks); + else if (free_blocks_count < 0) + ext3_warning(sb, __func__, "Bad blocks count %u", + input->blocks_count); + else if (!(bh = sb_bread(sb, end - 1))) + ext3_warning(sb, __func__, + "Cannot read last block ("E3FSBLK")", + end - 1); + else if (outside(input->block_bitmap, start, end)) + ext3_warning(sb, __func__, + "Block bitmap not in group (block %u)", + input->block_bitmap); + else if (outside(input->inode_bitmap, start, end)) + ext3_warning(sb, __func__, + "Inode bitmap not in group (block %u)", + input->inode_bitmap); + else if (outside(input->inode_table, start, end) || + outside(itend - 1, start, end)) + ext3_warning(sb, __func__, + "Inode table not in group (blocks %u-"E3FSBLK")", + input->inode_table, itend - 1); + else if (input->inode_bitmap == input->block_bitmap) + ext3_warning(sb, __func__, + "Block bitmap same as inode bitmap (%u)", + input->block_bitmap); + else if (inside(input->block_bitmap, input->inode_table, itend)) + ext3_warning(sb, __func__, + "Block bitmap (%u) in inode table (%u-"E3FSBLK")", + input->block_bitmap, input->inode_table, itend-1); + else if (inside(input->inode_bitmap, input->inode_table, itend)) + ext3_warning(sb, __func__, + "Inode bitmap (%u) in inode table (%u-"E3FSBLK")", + input->inode_bitmap, input->inode_table, itend-1); + else if (inside(input->block_bitmap, start, metaend)) + ext3_warning(sb, __func__, + "Block bitmap (%u) in GDT table" + " ("E3FSBLK"-"E3FSBLK")", + input->block_bitmap, start, metaend - 1); + else if (inside(input->inode_bitmap, start, metaend)) + ext3_warning(sb, __func__, + "Inode bitmap (%u) in GDT table" + " ("E3FSBLK"-"E3FSBLK")", + input->inode_bitmap, start, metaend - 1); + else if (inside(input->inode_table, start, metaend) || + inside(itend - 1, start, metaend)) + ext3_warning(sb, __func__, + "Inode table (%u-"E3FSBLK") overlaps" + "GDT table ("E3FSBLK"-"E3FSBLK")", + input->inode_table, itend - 1, start, metaend - 1); + else + err = 0; + brelse(bh); + + return err; +} + +static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, + ext3_fsblk_t blk) +{ + struct buffer_head *bh; + int err; + + bh = sb_getblk(sb, blk); + if (unlikely(!bh)) + return ERR_PTR(-ENOMEM); + if ((err = ext3_journal_get_write_access(handle, bh))) { + brelse(bh); + bh = ERR_PTR(err); + } else { + lock_buffer(bh); + memset(bh->b_data, 0, sb->s_blocksize); + set_buffer_uptodate(bh); + unlock_buffer(bh); + } + + return bh; +} + +/* + * To avoid calling the atomic setbit hundreds or thousands of times, we only + * need to use it within a single byte (to ensure we get endianness right). + * We can use memset for the rest of the bitmap as there are no other users. + */ +static void mark_bitmap_end(int start_bit, int end_bit, char *bitmap) +{ + int i; + + if (start_bit >= end_bit) + return; + + ext3_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); + for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) + ext3_set_bit(i, bitmap); + if (i < end_bit) + memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); +} + +/* + * If we have fewer than thresh credits, extend by EXT3_MAX_TRANS_DATA. + * If that fails, restart the transaction & regain write access for the + * buffer head which is used for block_bitmap modifications. + */ +static int extend_or_restart_transaction(handle_t *handle, int thresh, + struct buffer_head *bh) +{ + int err; + + if (handle->h_buffer_credits >= thresh) + return 0; + + err = ext3_journal_extend(handle, EXT3_MAX_TRANS_DATA); + if (err < 0) + return err; + if (err) { + err = ext3_journal_restart(handle, EXT3_MAX_TRANS_DATA); + if (err) + return err; + err = ext3_journal_get_write_access(handle, bh); + if (err) + return err; + } + + return 0; +} + +/* + * Set up the block and inode bitmaps, and the inode table for the new group. + * This doesn't need to be part of the main transaction, since we are only + * changing blocks outside the actual filesystem. We still do journaling to + * ensure the recovery is correct in case of a failure just after resize. + * If any part of this fails, we simply abort the resize. + */ +static int setup_new_group_blocks(struct super_block *sb, + struct ext3_new_group_data *input) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + ext3_fsblk_t start = ext3_group_first_block_no(sb, input->group); + int reserved_gdb = ext3_bg_has_super(sb, input->group) ? + le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0; + unsigned long gdblocks = ext3_bg_num_gdb(sb, input->group); + struct buffer_head *bh; + handle_t *handle; + ext3_fsblk_t block; + ext3_grpblk_t bit; + int i; + int err = 0, err2; + + /* This transaction may be extended/restarted along the way */ + handle = ext3_journal_start_sb(sb, EXT3_MAX_TRANS_DATA); + + if (IS_ERR(handle)) + return PTR_ERR(handle); + + mutex_lock(&sbi->s_resize_lock); + if (input->group != sbi->s_groups_count) { + err = -EBUSY; + goto exit_journal; + } + + if (IS_ERR(bh = bclean(handle, sb, input->block_bitmap))) { + err = PTR_ERR(bh); + goto exit_journal; + } + + if (ext3_bg_has_super(sb, input->group)) { + ext3_debug("mark backup superblock %#04lx (+0)\n", start); + ext3_set_bit(0, bh->b_data); + } + + /* Copy all of the GDT blocks into the backup in this group */ + for (i = 0, bit = 1, block = start + 1; + i < gdblocks; i++, block++, bit++) { + struct buffer_head *gdb; + + ext3_debug("update backup group %#04lx (+%d)\n", block, bit); + + err = extend_or_restart_transaction(handle, 1, bh); + if (err) + goto exit_bh; + + gdb = sb_getblk(sb, block); + if (unlikely(!gdb)) { + err = -ENOMEM; + goto exit_bh; + } + if ((err = ext3_journal_get_write_access(handle, gdb))) { + brelse(gdb); + goto exit_bh; + } + lock_buffer(gdb); + memcpy(gdb->b_data, sbi->s_group_desc[i]->b_data, gdb->b_size); + set_buffer_uptodate(gdb); + unlock_buffer(gdb); + err = ext3_journal_dirty_metadata(handle, gdb); + if (err) { + brelse(gdb); + goto exit_bh; + } + ext3_set_bit(bit, bh->b_data); + brelse(gdb); + } + + /* Zero out all of the reserved backup group descriptor table blocks */ + for (i = 0, bit = gdblocks + 1, block = start + bit; + i < reserved_gdb; i++, block++, bit++) { + struct buffer_head *gdb; + + ext3_debug("clear reserved block %#04lx (+%d)\n", block, bit); + + err = extend_or_restart_transaction(handle, 1, bh); + if (err) + goto exit_bh; + + if (IS_ERR(gdb = bclean(handle, sb, block))) { + err = PTR_ERR(gdb); + goto exit_bh; + } + err = ext3_journal_dirty_metadata(handle, gdb); + if (err) { + brelse(gdb); + goto exit_bh; + } + ext3_set_bit(bit, bh->b_data); + brelse(gdb); + } + ext3_debug("mark block bitmap %#04x (+%ld)\n", input->block_bitmap, + input->block_bitmap - start); + ext3_set_bit(input->block_bitmap - start, bh->b_data); + ext3_debug("mark inode bitmap %#04x (+%ld)\n", input->inode_bitmap, + input->inode_bitmap - start); + ext3_set_bit(input->inode_bitmap - start, bh->b_data); + + /* Zero out all of the inode table blocks */ + for (i = 0, block = input->inode_table, bit = block - start; + i < sbi->s_itb_per_group; i++, bit++, block++) { + struct buffer_head *it; + + ext3_debug("clear inode block %#04lx (+%d)\n", block, bit); + + err = extend_or_restart_transaction(handle, 1, bh); + if (err) + goto exit_bh; + + if (IS_ERR(it = bclean(handle, sb, block))) { + err = PTR_ERR(it); + goto exit_bh; + } + err = ext3_journal_dirty_metadata(handle, it); + if (err) { + brelse(it); + goto exit_bh; + } + brelse(it); + ext3_set_bit(bit, bh->b_data); + } + + err = extend_or_restart_transaction(handle, 2, bh); + if (err) + goto exit_bh; + + mark_bitmap_end(input->blocks_count, EXT3_BLOCKS_PER_GROUP(sb), + bh->b_data); + err = ext3_journal_dirty_metadata(handle, bh); + if (err) + goto exit_bh; + brelse(bh); + + /* Mark unused entries in inode bitmap used */ + ext3_debug("clear inode bitmap %#04x (+%ld)\n", + input->inode_bitmap, input->inode_bitmap - start); + if (IS_ERR(bh = bclean(handle, sb, input->inode_bitmap))) { + err = PTR_ERR(bh); + goto exit_journal; + } + + mark_bitmap_end(EXT3_INODES_PER_GROUP(sb), EXT3_BLOCKS_PER_GROUP(sb), + bh->b_data); + err = ext3_journal_dirty_metadata(handle, bh); +exit_bh: + brelse(bh); + +exit_journal: + mutex_unlock(&sbi->s_resize_lock); + if ((err2 = ext3_journal_stop(handle)) && !err) + err = err2; + + return err; +} + +/* + * Iterate through the groups which hold BACKUP superblock/GDT copies in an + * ext3 filesystem. The counters should be initialized to 1, 5, and 7 before + * calling this for the first time. In a sparse filesystem it will be the + * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... + * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... + */ +static unsigned ext3_list_backups(struct super_block *sb, unsigned *three, + unsigned *five, unsigned *seven) +{ + unsigned *min = three; + int mult = 3; + unsigned ret; + + if (!EXT3_HAS_RO_COMPAT_FEATURE(sb, + EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)) { + ret = *min; + *min += 1; + return ret; + } + + if (*five < *min) { + min = five; + mult = 5; + } + if (*seven < *min) { + min = seven; + mult = 7; + } + + ret = *min; + *min *= mult; + + return ret; +} + +/* + * Check that all of the backup GDT blocks are held in the primary GDT block. + * It is assumed that they are stored in group order. Returns the number of + * groups in current filesystem that have BACKUPS, or -ve error code. + */ +static int verify_reserved_gdb(struct super_block *sb, + struct buffer_head *primary) +{ + const ext3_fsblk_t blk = primary->b_blocknr; + const unsigned long end = EXT3_SB(sb)->s_groups_count; + unsigned three = 1; + unsigned five = 5; + unsigned seven = 7; + unsigned grp; + __le32 *p = (__le32 *)primary->b_data; + int gdbackups = 0; + + while ((grp = ext3_list_backups(sb, &three, &five, &seven)) < end) { + if (le32_to_cpu(*p++) != grp * EXT3_BLOCKS_PER_GROUP(sb) + blk){ + ext3_warning(sb, __func__, + "reserved GDT "E3FSBLK + " missing grp %d ("E3FSBLK")", + blk, grp, + grp * EXT3_BLOCKS_PER_GROUP(sb) + blk); + return -EINVAL; + } + if (++gdbackups > EXT3_ADDR_PER_BLOCK(sb)) + return -EFBIG; + } + + return gdbackups; +} + +/* + * Called when we need to bring a reserved group descriptor table block into + * use from the resize inode. The primary copy of the new GDT block currently + * is an indirect block (under the double indirect block in the resize inode). + * The new backup GDT blocks will be stored as leaf blocks in this indirect + * block, in group order. Even though we know all the block numbers we need, + * we check to ensure that the resize inode has actually reserved these blocks. + * + * Don't need to update the block bitmaps because the blocks are still in use. + * + * We get all of the error cases out of the way, so that we are sure to not + * fail once we start modifying the data on disk, because JBD has no rollback. + */ +static int add_new_gdb(handle_t *handle, struct inode *inode, + struct ext3_new_group_data *input, + struct buffer_head **primary) +{ + struct super_block *sb = inode->i_sb; + struct ext3_super_block *es = EXT3_SB(sb)->s_es; + unsigned long gdb_num = input->group / EXT3_DESC_PER_BLOCK(sb); + ext3_fsblk_t gdblock = EXT3_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; + struct buffer_head **o_group_desc, **n_group_desc; + struct buffer_head *dind; + int gdbackups; + struct ext3_iloc iloc; + __le32 *data; + int err; + + if (test_opt(sb, DEBUG)) + printk(KERN_DEBUG + "EXT3-fs: ext3_add_new_gdb: adding group block %lu\n", + gdb_num); + + /* + * If we are not using the primary superblock/GDT copy don't resize, + * because the user tools have no way of handling this. Probably a + * bad time to do it anyways. + */ + if (EXT3_SB(sb)->s_sbh->b_blocknr != + le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block)) { + ext3_warning(sb, __func__, + "won't resize using backup superblock at %llu", + (unsigned long long)EXT3_SB(sb)->s_sbh->b_blocknr); + return -EPERM; + } + + *primary = sb_bread(sb, gdblock); + if (!*primary) + return -EIO; + + if ((gdbackups = verify_reserved_gdb(sb, *primary)) < 0) { + err = gdbackups; + goto exit_bh; + } + + data = EXT3_I(inode)->i_data + EXT3_DIND_BLOCK; + dind = sb_bread(sb, le32_to_cpu(*data)); + if (!dind) { + err = -EIO; + goto exit_bh; + } + + data = (__le32 *)dind->b_data; + if (le32_to_cpu(data[gdb_num % EXT3_ADDR_PER_BLOCK(sb)]) != gdblock) { + ext3_warning(sb, __func__, + "new group %u GDT block "E3FSBLK" not reserved", + input->group, gdblock); + err = -EINVAL; + goto exit_dind; + } + + if ((err = ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh))) + goto exit_dind; + + if ((err = ext3_journal_get_write_access(handle, *primary))) + goto exit_sbh; + + if ((err = ext3_journal_get_write_access(handle, dind))) + goto exit_primary; + + /* ext3_reserve_inode_write() gets a reference on the iloc */ + if ((err = ext3_reserve_inode_write(handle, inode, &iloc))) + goto exit_dindj; + + n_group_desc = kmalloc((gdb_num + 1) * sizeof(struct buffer_head *), + GFP_NOFS); + if (!n_group_desc) { + err = -ENOMEM; + ext3_warning (sb, __func__, + "not enough memory for %lu groups", gdb_num + 1); + goto exit_inode; + } + + /* + * Finally, we have all of the possible failures behind us... + * + * Remove new GDT block from inode double-indirect block and clear out + * the new GDT block for use (which also "frees" the backup GDT blocks + * from the reserved inode). We don't need to change the bitmaps for + * these blocks, because they are marked as in-use from being in the + * reserved inode, and will become GDT blocks (primary and backup). + */ + data[gdb_num % EXT3_ADDR_PER_BLOCK(sb)] = 0; + err = ext3_journal_dirty_metadata(handle, dind); + if (err) + goto exit_group_desc; + brelse(dind); + dind = NULL; + inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; + err = ext3_mark_iloc_dirty(handle, inode, &iloc); + if (err) + goto exit_group_desc; + memset((*primary)->b_data, 0, sb->s_blocksize); + err = ext3_journal_dirty_metadata(handle, *primary); + if (err) + goto exit_group_desc; + + o_group_desc = EXT3_SB(sb)->s_group_desc; + memcpy(n_group_desc, o_group_desc, + EXT3_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); + n_group_desc[gdb_num] = *primary; + EXT3_SB(sb)->s_group_desc = n_group_desc; + EXT3_SB(sb)->s_gdb_count++; + kfree(o_group_desc); + + le16_add_cpu(&es->s_reserved_gdt_blocks, -1); + err = ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh); + if (err) + goto exit_inode; + + return 0; + +exit_group_desc: + kfree(n_group_desc); +exit_inode: + //ext3_journal_release_buffer(handle, iloc.bh); + brelse(iloc.bh); +exit_dindj: + //ext3_journal_release_buffer(handle, dind); +exit_primary: + //ext3_journal_release_buffer(handle, *primary); +exit_sbh: + //ext3_journal_release_buffer(handle, *primary); +exit_dind: + brelse(dind); +exit_bh: + brelse(*primary); + + ext3_debug("leaving with error %d\n", err); + return err; +} + +/* + * Called when we are adding a new group which has a backup copy of each of + * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. + * We need to add these reserved backup GDT blocks to the resize inode, so + * that they are kept for future resizing and not allocated to files. + * + * Each reserved backup GDT block will go into a different indirect block. + * The indirect blocks are actually the primary reserved GDT blocks, + * so we know in advance what their block numbers are. We only get the + * double-indirect block to verify it is pointing to the primary reserved + * GDT blocks so we don't overwrite a data block by accident. The reserved + * backup GDT blocks are stored in their reserved primary GDT block. + */ +static int reserve_backup_gdb(handle_t *handle, struct inode *inode, + struct ext3_new_group_data *input) +{ + struct super_block *sb = inode->i_sb; + int reserved_gdb =le16_to_cpu(EXT3_SB(sb)->s_es->s_reserved_gdt_blocks); + struct buffer_head **primary; + struct buffer_head *dind; + struct ext3_iloc iloc; + ext3_fsblk_t blk; + __le32 *data, *end; + int gdbackups = 0; + int res, i; + int err; + + primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); + if (!primary) + return -ENOMEM; + + data = EXT3_I(inode)->i_data + EXT3_DIND_BLOCK; + dind = sb_bread(sb, le32_to_cpu(*data)); + if (!dind) { + err = -EIO; + goto exit_free; + } + + blk = EXT3_SB(sb)->s_sbh->b_blocknr + 1 + EXT3_SB(sb)->s_gdb_count; + data = (__le32 *)dind->b_data + (EXT3_SB(sb)->s_gdb_count % + EXT3_ADDR_PER_BLOCK(sb)); + end = (__le32 *)dind->b_data + EXT3_ADDR_PER_BLOCK(sb); + + /* Get each reserved primary GDT block and verify it holds backups */ + for (res = 0; res < reserved_gdb; res++, blk++) { + if (le32_to_cpu(*data) != blk) { + ext3_warning(sb, __func__, + "reserved block "E3FSBLK + " not at offset %ld", + blk, + (long)(data - (__le32 *)dind->b_data)); + err = -EINVAL; + goto exit_bh; + } + primary[res] = sb_bread(sb, blk); + if (!primary[res]) { + err = -EIO; + goto exit_bh; + } + if ((gdbackups = verify_reserved_gdb(sb, primary[res])) < 0) { + brelse(primary[res]); + err = gdbackups; + goto exit_bh; + } + if (++data >= end) + data = (__le32 *)dind->b_data; + } + + for (i = 0; i < reserved_gdb; i++) { + if ((err = ext3_journal_get_write_access(handle, primary[i]))) { + /* + int j; + for (j = 0; j < i; j++) + ext3_journal_release_buffer(handle, primary[j]); + */ + goto exit_bh; + } + } + + if ((err = ext3_reserve_inode_write(handle, inode, &iloc))) + goto exit_bh; + + /* + * Finally we can add each of the reserved backup GDT blocks from + * the new group to its reserved primary GDT block. + */ + blk = input->group * EXT3_BLOCKS_PER_GROUP(sb); + for (i = 0; i < reserved_gdb; i++) { + int err2; + data = (__le32 *)primary[i]->b_data; + /* printk("reserving backup %lu[%u] = %lu\n", + primary[i]->b_blocknr, gdbackups, + blk + primary[i]->b_blocknr); */ + data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); + err2 = ext3_journal_dirty_metadata(handle, primary[i]); + if (!err) + err = err2; + } + inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; + ext3_mark_iloc_dirty(handle, inode, &iloc); + +exit_bh: + while (--res >= 0) + brelse(primary[res]); + brelse(dind); + +exit_free: + kfree(primary); + + return err; +} + +/* + * Update the backup copies of the ext3 metadata. These don't need to be part + * of the main resize transaction, because e2fsck will re-write them if there + * is a problem (basically only OOM will cause a problem). However, we + * _should_ update the backups if possible, in case the primary gets trashed + * for some reason and we need to run e2fsck from a backup superblock. The + * important part is that the new block and inode counts are in the backup + * superblocks, and the location of the new group metadata in the GDT backups. + * + * We do not need take the s_resize_lock for this, because these + * blocks are not otherwise touched by the filesystem code when it is + * mounted. We don't need to worry about last changing from + * sbi->s_groups_count, because the worst that can happen is that we + * do not copy the full number of backups at this time. The resize + * which changed s_groups_count will backup again. + */ +static void update_backups(struct super_block *sb, + int blk_off, char *data, int size) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + const unsigned long last = sbi->s_groups_count; + const int bpg = EXT3_BLOCKS_PER_GROUP(sb); + unsigned three = 1; + unsigned five = 5; + unsigned seven = 7; + unsigned group; + int rest = sb->s_blocksize - size; + handle_t *handle; + int err = 0, err2; + + handle = ext3_journal_start_sb(sb, EXT3_MAX_TRANS_DATA); + if (IS_ERR(handle)) { + group = 1; + err = PTR_ERR(handle); + goto exit_err; + } + + while ((group = ext3_list_backups(sb, &three, &five, &seven)) < last) { + struct buffer_head *bh; + + /* Out of journal space, and can't get more - abort - so sad */ + if (handle->h_buffer_credits == 0 && + ext3_journal_extend(handle, EXT3_MAX_TRANS_DATA) && + (err = ext3_journal_restart(handle, EXT3_MAX_TRANS_DATA))) + break; + + bh = sb_getblk(sb, group * bpg + blk_off); + if (unlikely(!bh)) { + err = -ENOMEM; + break; + } + ext3_debug("update metadata backup %#04lx\n", + (unsigned long)bh->b_blocknr); + if ((err = ext3_journal_get_write_access(handle, bh))) { + brelse(bh); + break; + } + lock_buffer(bh); + memcpy(bh->b_data, data, size); + if (rest) + memset(bh->b_data + size, 0, rest); + set_buffer_uptodate(bh); + unlock_buffer(bh); + err = ext3_journal_dirty_metadata(handle, bh); + brelse(bh); + if (err) + break; + } + if ((err2 = ext3_journal_stop(handle)) && !err) + err = err2; + + /* + * Ugh! Need to have e2fsck write the backup copies. It is too + * late to revert the resize, we shouldn't fail just because of + * the backup copies (they are only needed in case of corruption). + * + * However, if we got here we have a journal problem too, so we + * can't really start a transaction to mark the superblock. + * Chicken out and just set the flag on the hope it will be written + * to disk, and if not - we will simply wait until next fsck. + */ +exit_err: + if (err) { + ext3_warning(sb, __func__, + "can't update backup for group %d (err %d), " + "forcing fsck on next reboot", group, err); + sbi->s_mount_state &= ~EXT3_VALID_FS; + sbi->s_es->s_state &= cpu_to_le16(~EXT3_VALID_FS); + mark_buffer_dirty(sbi->s_sbh); + } +} + +/* Add group descriptor data to an existing or new group descriptor block. + * Ensure we handle all possible error conditions _before_ we start modifying + * the filesystem, because we cannot abort the transaction and not have it + * write the data to disk. + * + * If we are on a GDT block boundary, we need to get the reserved GDT block. + * Otherwise, we may need to add backup GDT blocks for a sparse group. + * + * We only need to hold the superblock lock while we are actually adding + * in the new group's counts to the superblock. Prior to that we have + * not really "added" the group at all. We re-check that we are still + * adding in the last group in case things have changed since verifying. + */ +int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + struct ext3_super_block *es = sbi->s_es; + int reserved_gdb = ext3_bg_has_super(sb, input->group) ? + le16_to_cpu(es->s_reserved_gdt_blocks) : 0; + struct buffer_head *primary = NULL; + struct ext3_group_desc *gdp; + struct inode *inode = NULL; + handle_t *handle; + int gdb_off, gdb_num; + int err, err2; + + gdb_num = input->group / EXT3_DESC_PER_BLOCK(sb); + gdb_off = input->group % EXT3_DESC_PER_BLOCK(sb); + + if (gdb_off == 0 && !EXT3_HAS_RO_COMPAT_FEATURE(sb, + EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)) { + ext3_warning(sb, __func__, + "Can't resize non-sparse filesystem further"); + return -EPERM; + } + + if (le32_to_cpu(es->s_blocks_count) + input->blocks_count < + le32_to_cpu(es->s_blocks_count)) { + ext3_warning(sb, __func__, "blocks_count overflow\n"); + return -EINVAL; + } + + if (le32_to_cpu(es->s_inodes_count) + EXT3_INODES_PER_GROUP(sb) < + le32_to_cpu(es->s_inodes_count)) { + ext3_warning(sb, __func__, "inodes_count overflow\n"); + return -EINVAL; + } + + if (reserved_gdb || gdb_off == 0) { + if (!EXT3_HAS_COMPAT_FEATURE(sb, + EXT3_FEATURE_COMPAT_RESIZE_INODE) + || !le16_to_cpu(es->s_reserved_gdt_blocks)) { + ext3_warning(sb, __func__, + "No reserved GDT blocks, can't resize"); + return -EPERM; + } + inode = ext3_iget(sb, EXT3_RESIZE_INO); + if (IS_ERR(inode)) { + ext3_warning(sb, __func__, + "Error opening resize inode"); + return PTR_ERR(inode); + } + } + + if ((err = verify_group_input(sb, input))) + goto exit_put; + + if ((err = setup_new_group_blocks(sb, input))) + goto exit_put; + + /* + * We will always be modifying at least the superblock and a GDT + * block. If we are adding a group past the last current GDT block, + * we will also modify the inode and the dindirect block. If we + * are adding a group with superblock/GDT backups we will also + * modify each of the reserved GDT dindirect blocks. + */ + handle = ext3_journal_start_sb(sb, + ext3_bg_has_super(sb, input->group) ? + 3 + reserved_gdb : 4); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + goto exit_put; + } + + mutex_lock(&sbi->s_resize_lock); + if (input->group != sbi->s_groups_count) { + ext3_warning(sb, __func__, + "multiple resizers run on filesystem!"); + err = -EBUSY; + goto exit_journal; + } + + if ((err = ext3_journal_get_write_access(handle, sbi->s_sbh))) + goto exit_journal; + + /* + * We will only either add reserved group blocks to a backup group + * or remove reserved blocks for the first group in a new group block. + * Doing both would be mean more complex code, and sane people don't + * use non-sparse filesystems anymore. This is already checked above. + */ + if (gdb_off) { + primary = sbi->s_group_desc[gdb_num]; + if ((err = ext3_journal_get_write_access(handle, primary))) + goto exit_journal; + + if (reserved_gdb && ext3_bg_num_gdb(sb, input->group) && + (err = reserve_backup_gdb(handle, inode, input))) + goto exit_journal; + } else if ((err = add_new_gdb(handle, inode, input, &primary))) + goto exit_journal; + + /* + * OK, now we've set up the new group. Time to make it active. + * + * We do not lock all allocations via s_resize_lock + * so we have to be safe wrt. concurrent accesses the group + * data. So we need to be careful to set all of the relevant + * group descriptor data etc. *before* we enable the group. + * + * The key field here is sbi->s_groups_count: as long as + * that retains its old value, nobody is going to access the new + * group. + * + * So first we update all the descriptor metadata for the new + * group; then we update the total disk blocks count; then we + * update the groups count to enable the group; then finally we + * update the free space counts so that the system can start + * using the new disk blocks. + */ + + /* Update group descriptor block for new group */ + gdp = (struct ext3_group_desc *)primary->b_data + gdb_off; + + gdp->bg_block_bitmap = cpu_to_le32(input->block_bitmap); + gdp->bg_inode_bitmap = cpu_to_le32(input->inode_bitmap); + gdp->bg_inode_table = cpu_to_le32(input->inode_table); + gdp->bg_free_blocks_count = cpu_to_le16(input->free_blocks_count); + gdp->bg_free_inodes_count = cpu_to_le16(EXT3_INODES_PER_GROUP(sb)); + + /* + * Make the new blocks and inodes valid next. We do this before + * increasing the group count so that once the group is enabled, + * all of its blocks and inodes are already valid. + * + * We always allocate group-by-group, then block-by-block or + * inode-by-inode within a group, so enabling these + * blocks/inodes before the group is live won't actually let us + * allocate the new space yet. + */ + le32_add_cpu(&es->s_blocks_count, input->blocks_count); + le32_add_cpu(&es->s_inodes_count, EXT3_INODES_PER_GROUP(sb)); + + /* + * We need to protect s_groups_count against other CPUs seeing + * inconsistent state in the superblock. + * + * The precise rules we use are: + * + * * Writers of s_groups_count *must* hold s_resize_lock + * AND + * * Writers must perform a smp_wmb() after updating all dependent + * data and before modifying the groups count + * + * * Readers must hold s_resize_lock over the access + * OR + * * Readers must perform an smp_rmb() after reading the groups count + * and before reading any dependent data. + * + * NB. These rules can be relaxed when checking the group count + * while freeing data, as we can only allocate from a block + * group after serialising against the group count, and we can + * only then free after serialising in turn against that + * allocation. + */ + smp_wmb(); + + /* Update the global fs size fields */ + sbi->s_groups_count++; + + err = ext3_journal_dirty_metadata(handle, primary); + if (err) + goto exit_journal; + + /* Update the reserved block counts only once the new group is + * active. */ + le32_add_cpu(&es->s_r_blocks_count, input->reserved_blocks); + + /* Update the free space counts */ + percpu_counter_add(&sbi->s_freeblocks_counter, + input->free_blocks_count); + percpu_counter_add(&sbi->s_freeinodes_counter, + EXT3_INODES_PER_GROUP(sb)); + + err = ext3_journal_dirty_metadata(handle, sbi->s_sbh); + +exit_journal: + mutex_unlock(&sbi->s_resize_lock); + if ((err2 = ext3_journal_stop(handle)) && !err) + err = err2; + if (!err) { + update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, + sizeof(struct ext3_super_block)); + update_backups(sb, primary->b_blocknr, primary->b_data, + primary->b_size); + } +exit_put: + iput(inode); + return err; +} /* ext3_group_add */ + +/* Extend the filesystem to the new number of blocks specified. This entry + * point is only used to extend the current filesystem to the end of the last + * existing group. It can be accessed via ioctl, or by "remount,resize=" + * for emergencies (because it has no dependencies on reserved blocks). + * + * If we _really_ wanted, we could use default values to call ext3_group_add() + * allow the "remount" trick to work for arbitrary resizing, assuming enough + * GDT blocks are reserved to grow to the desired size. + */ +int ext3_group_extend(struct super_block *sb, struct ext3_super_block *es, + ext3_fsblk_t n_blocks_count) +{ + ext3_fsblk_t o_blocks_count; + ext3_grpblk_t last; + ext3_grpblk_t add; + struct buffer_head * bh; + handle_t *handle; + int err; + unsigned long freed_blocks; + + /* We don't need to worry about locking wrt other resizers just + * yet: we're going to revalidate es->s_blocks_count after + * taking the s_resize_lock below. */ + o_blocks_count = le32_to_cpu(es->s_blocks_count); + + if (test_opt(sb, DEBUG)) + printk(KERN_DEBUG "EXT3-fs: extending last group from "E3FSBLK + " up to "E3FSBLK" blocks\n", + o_blocks_count, n_blocks_count); + + if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) + return 0; + + if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { + printk(KERN_ERR "EXT3-fs: filesystem on %s:" + " too large to resize to "E3FSBLK" blocks safely\n", + sb->s_id, n_blocks_count); + if (sizeof(sector_t) < 8) + ext3_warning(sb, __func__, + "CONFIG_LBDAF not enabled\n"); + return -EINVAL; + } + + if (n_blocks_count < o_blocks_count) { + ext3_warning(sb, __func__, + "can't shrink FS - resize aborted"); + return -EBUSY; + } + + /* Handle the remaining blocks in the last group only. */ + last = (o_blocks_count - le32_to_cpu(es->s_first_data_block)) % + EXT3_BLOCKS_PER_GROUP(sb); + + if (last == 0) { + ext3_warning(sb, __func__, + "need to use ext2online to resize further"); + return -EPERM; + } + + add = EXT3_BLOCKS_PER_GROUP(sb) - last; + + if (o_blocks_count + add < o_blocks_count) { + ext3_warning(sb, __func__, "blocks_count overflow"); + return -EINVAL; + } + + if (o_blocks_count + add > n_blocks_count) + add = n_blocks_count - o_blocks_count; + + if (o_blocks_count + add < n_blocks_count) + ext3_warning(sb, __func__, + "will only finish group ("E3FSBLK + " blocks, %u new)", + o_blocks_count + add, add); + + /* See if the device is actually as big as what was requested */ + bh = sb_bread(sb, o_blocks_count + add -1); + if (!bh) { + ext3_warning(sb, __func__, + "can't read last block, resize aborted"); + return -ENOSPC; + } + brelse(bh); + + /* We will update the superblock, one block bitmap, and + * one group descriptor via ext3_free_blocks(). + */ + handle = ext3_journal_start_sb(sb, 3); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + ext3_warning(sb, __func__, "error %d on journal start",err); + goto exit_put; + } + + mutex_lock(&EXT3_SB(sb)->s_resize_lock); + if (o_blocks_count != le32_to_cpu(es->s_blocks_count)) { + ext3_warning(sb, __func__, + "multiple resizers run on filesystem!"); + mutex_unlock(&EXT3_SB(sb)->s_resize_lock); + ext3_journal_stop(handle); + err = -EBUSY; + goto exit_put; + } + + if ((err = ext3_journal_get_write_access(handle, + EXT3_SB(sb)->s_sbh))) { + ext3_warning(sb, __func__, + "error %d on journal write access", err); + mutex_unlock(&EXT3_SB(sb)->s_resize_lock); + ext3_journal_stop(handle); + goto exit_put; + } + es->s_blocks_count = cpu_to_le32(o_blocks_count + add); + err = ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh); + mutex_unlock(&EXT3_SB(sb)->s_resize_lock); + if (err) { + ext3_warning(sb, __func__, + "error %d on journal dirty metadata", err); + ext3_journal_stop(handle); + goto exit_put; + } + ext3_debug("freeing blocks "E3FSBLK" through "E3FSBLK"\n", + o_blocks_count, o_blocks_count + add); + ext3_free_blocks_sb(handle, sb, o_blocks_count, add, &freed_blocks); + ext3_debug("freed blocks "E3FSBLK" through "E3FSBLK"\n", + o_blocks_count, o_blocks_count + add); + if ((err = ext3_journal_stop(handle))) + goto exit_put; + if (test_opt(sb, DEBUG)) + printk(KERN_DEBUG "EXT3-fs: extended group to %u blocks\n", + le32_to_cpu(es->s_blocks_count)); + update_backups(sb, EXT3_SB(sb)->s_sbh->b_blocknr, (char *)es, + sizeof(struct ext3_super_block)); +exit_put: + return err; +} /* ext3_group_extend */ diff --git a/kernel/fs/ext3/super.c b/kernel/fs/ext3/super.c new file mode 100644 index 000000000..a9312f0a5 --- /dev/null +++ b/kernel/fs/ext3/super.c @@ -0,0 +1,3165 @@ +/* + * linux/fs/ext3/super.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/inode.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * Big-endian to little-endian byte-swapping/bitmaps by + * David S. Miller (davem@caip.rutgers.edu), 1995 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define CREATE_TRACE_POINTS + +#include "ext3.h" +#include "xattr.h" +#include "acl.h" +#include "namei.h" + +#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED + #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA +#else + #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA +#endif + +static int ext3_load_journal(struct super_block *, struct ext3_super_block *, + unsigned long journal_devnum); +static int ext3_create_journal(struct super_block *, struct ext3_super_block *, + unsigned int); +static int ext3_commit_super(struct super_block *sb, + struct ext3_super_block *es, + int sync); +static void ext3_mark_recovery_complete(struct super_block * sb, + struct ext3_super_block * es); +static void ext3_clear_journal_err(struct super_block * sb, + struct ext3_super_block * es); +static int ext3_sync_fs(struct super_block *sb, int wait); +static const char *ext3_decode_error(struct super_block * sb, int errno, + char nbuf[16]); +static int ext3_remount (struct super_block * sb, int * flags, char * data); +static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf); +static int ext3_unfreeze(struct super_block *sb); +static int ext3_freeze(struct super_block *sb); + +/* + * Wrappers for journal_start/end. + */ +handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks) +{ + journal_t *journal; + + if (sb->s_flags & MS_RDONLY) + return ERR_PTR(-EROFS); + + /* Special case here: if the journal has aborted behind our + * backs (eg. EIO in the commit thread), then we still need to + * take the FS itself readonly cleanly. */ + journal = EXT3_SB(sb)->s_journal; + if (is_journal_aborted(journal)) { + ext3_abort(sb, __func__, + "Detected aborted journal"); + return ERR_PTR(-EROFS); + } + + return journal_start(journal, nblocks); +} + +int __ext3_journal_stop(const char *where, handle_t *handle) +{ + struct super_block *sb; + int err; + int rc; + + sb = handle->h_transaction->t_journal->j_private; + err = handle->h_err; + rc = journal_stop(handle); + + if (!err) + err = rc; + if (err) + __ext3_std_error(sb, where, err); + return err; +} + +void ext3_journal_abort_handle(const char *caller, const char *err_fn, + struct buffer_head *bh, handle_t *handle, int err) +{ + char nbuf[16]; + const char *errstr = ext3_decode_error(NULL, err, nbuf); + + if (bh) + BUFFER_TRACE(bh, "abort"); + + if (!handle->h_err) + handle->h_err = err; + + if (is_handle_aborted(handle)) + return; + + printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n", + caller, errstr, err_fn); + + journal_abort_handle(handle); +} + +void ext3_msg(struct super_block *sb, const char *prefix, + const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + + vaf.fmt = fmt; + vaf.va = &args; + + printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf); + + va_end(args); +} + +/* Deal with the reporting of failure conditions on a filesystem such as + * inconsistencies detected or read IO failures. + * + * On ext2, we can store the error state of the filesystem in the + * superblock. That is not possible on ext3, because we may have other + * write ordering constraints on the superblock which prevent us from + * writing it out straight away; and given that the journal is about to + * be aborted, we can't rely on the current, or future, transactions to + * write out the superblock safely. + * + * We'll just use the journal_abort() error code to record an error in + * the journal instead. On recovery, the journal will complain about + * that error until we've noted it down and cleared it. + */ + +static void ext3_handle_error(struct super_block *sb) +{ + struct ext3_super_block *es = EXT3_SB(sb)->s_es; + + EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; + es->s_state |= cpu_to_le16(EXT3_ERROR_FS); + + if (sb->s_flags & MS_RDONLY) + return; + + if (!test_opt (sb, ERRORS_CONT)) { + journal_t *journal = EXT3_SB(sb)->s_journal; + + set_opt(EXT3_SB(sb)->s_mount_opt, ABORT); + if (journal) + journal_abort(journal, -EIO); + } + if (test_opt (sb, ERRORS_RO)) { + ext3_msg(sb, KERN_CRIT, + "error: remounting filesystem read-only"); + /* + * Make sure updated value of ->s_mount_state will be visible + * before ->s_flags update. + */ + smp_wmb(); + sb->s_flags |= MS_RDONLY; + } + ext3_commit_super(sb, es, 1); + if (test_opt(sb, ERRORS_PANIC)) + panic("EXT3-fs (%s): panic forced after error\n", + sb->s_id); +} + +void ext3_error(struct super_block *sb, const char *function, + const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + + vaf.fmt = fmt; + vaf.va = &args; + + printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n", + sb->s_id, function, &vaf); + + va_end(args); + + ext3_handle_error(sb); +} + +static const char *ext3_decode_error(struct super_block * sb, int errno, + char nbuf[16]) +{ + char *errstr = NULL; + + switch (errno) { + case -EIO: + errstr = "IO failure"; + break; + case -ENOMEM: + errstr = "Out of memory"; + break; + case -EROFS: + if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT) + errstr = "Journal has aborted"; + else + errstr = "Readonly filesystem"; + break; + default: + /* If the caller passed in an extra buffer for unknown + * errors, textualise them now. Else we just return + * NULL. */ + if (nbuf) { + /* Check for truncated error codes... */ + if (snprintf(nbuf, 16, "error %d", -errno) >= 0) + errstr = nbuf; + } + break; + } + + return errstr; +} + +/* __ext3_std_error decodes expected errors from journaling functions + * automatically and invokes the appropriate error response. */ + +void __ext3_std_error (struct super_block * sb, const char * function, + int errno) +{ + char nbuf[16]; + const char *errstr; + + /* Special case: if the error is EROFS, and we're not already + * inside a transaction, then there's really no point in logging + * an error. */ + if (errno == -EROFS && journal_current_handle() == NULL && + (sb->s_flags & MS_RDONLY)) + return; + + errstr = ext3_decode_error(sb, errno, nbuf); + ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr); + + ext3_handle_error(sb); +} + +/* + * ext3_abort is a much stronger failure handler than ext3_error. The + * abort function may be used to deal with unrecoverable failures such + * as journal IO errors or ENOMEM at a critical moment in log management. + * + * We unconditionally force the filesystem into an ABORT|READONLY state, + * unless the error response on the fs has been set to panic in which + * case we take the easy way out and panic immediately. + */ + +void ext3_abort(struct super_block *sb, const char *function, + const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + + vaf.fmt = fmt; + vaf.va = &args; + + printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n", + sb->s_id, function, &vaf); + + va_end(args); + + if (test_opt(sb, ERRORS_PANIC)) + panic("EXT3-fs: panic from previous error\n"); + + if (sb->s_flags & MS_RDONLY) + return; + + ext3_msg(sb, KERN_CRIT, + "error: remounting filesystem read-only"); + EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; + set_opt(EXT3_SB(sb)->s_mount_opt, ABORT); + /* + * Make sure updated value of ->s_mount_state will be visible + * before ->s_flags update. + */ + smp_wmb(); + sb->s_flags |= MS_RDONLY; + + if (EXT3_SB(sb)->s_journal) + journal_abort(EXT3_SB(sb)->s_journal, -EIO); +} + +void ext3_warning(struct super_block *sb, const char *function, + const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + + vaf.fmt = fmt; + vaf.va = &args; + + printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n", + sb->s_id, function, &vaf); + + va_end(args); +} + +void ext3_update_dynamic_rev(struct super_block *sb) +{ + struct ext3_super_block *es = EXT3_SB(sb)->s_es; + + if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV) + return; + + ext3_msg(sb, KERN_WARNING, + "warning: updating to rev %d because of " + "new feature flag, running e2fsck is recommended", + EXT3_DYNAMIC_REV); + + es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO); + es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE); + es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV); + /* leave es->s_feature_*compat flags alone */ + /* es->s_uuid will be set by e2fsck if empty */ + + /* + * The rest of the superblock fields should be zero, and if not it + * means they are likely already in use, so leave them alone. We + * can leave it up to e2fsck to clean up any inconsistencies there. + */ +} + +/* + * Open the external journal device + */ +static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb) +{ + struct block_device *bdev; + char b[BDEVNAME_SIZE]; + + bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); + if (IS_ERR(bdev)) + goto fail; + return bdev; + +fail: + ext3_msg(sb, KERN_ERR, "error: failed to open journal device %s: %ld", + __bdevname(dev, b), PTR_ERR(bdev)); + + return NULL; +} + +/* + * Release the journal device + */ +static void ext3_blkdev_put(struct block_device *bdev) +{ + blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); +} + +static void ext3_blkdev_remove(struct ext3_sb_info *sbi) +{ + struct block_device *bdev; + bdev = sbi->journal_bdev; + if (bdev) { + ext3_blkdev_put(bdev); + sbi->journal_bdev = NULL; + } +} + +static inline struct inode *orphan_list_entry(struct list_head *l) +{ + return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode; +} + +static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi) +{ + struct list_head *l; + + ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d", + le32_to_cpu(sbi->s_es->s_last_orphan)); + + ext3_msg(sb, KERN_ERR, "sb_info orphan list:"); + list_for_each(l, &sbi->s_orphan) { + struct inode *inode = orphan_list_entry(l); + ext3_msg(sb, KERN_ERR, " " + "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", + inode->i_sb->s_id, inode->i_ino, inode, + inode->i_mode, inode->i_nlink, + NEXT_ORPHAN(inode)); + } +} + +static void ext3_put_super (struct super_block * sb) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + struct ext3_super_block *es = sbi->s_es; + int i, err; + + dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); + ext3_xattr_put_super(sb); + err = journal_destroy(sbi->s_journal); + sbi->s_journal = NULL; + if (err < 0) + ext3_abort(sb, __func__, "Couldn't clean up the journal"); + + if (!(sb->s_flags & MS_RDONLY)) { + EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); + es->s_state = cpu_to_le16(sbi->s_mount_state); + BUFFER_TRACE(sbi->s_sbh, "marking dirty"); + mark_buffer_dirty(sbi->s_sbh); + ext3_commit_super(sb, es, 1); + } + + for (i = 0; i < sbi->s_gdb_count; i++) + brelse(sbi->s_group_desc[i]); + kfree(sbi->s_group_desc); + percpu_counter_destroy(&sbi->s_freeblocks_counter); + percpu_counter_destroy(&sbi->s_freeinodes_counter); + percpu_counter_destroy(&sbi->s_dirs_counter); + brelse(sbi->s_sbh); +#ifdef CONFIG_QUOTA + for (i = 0; i < EXT3_MAXQUOTAS; i++) + kfree(sbi->s_qf_names[i]); +#endif + + /* Debugging code just in case the in-memory inode orphan list + * isn't empty. The on-disk one can be non-empty if we've + * detected an error and taken the fs readonly, but the + * in-memory list had better be clean by this point. */ + if (!list_empty(&sbi->s_orphan)) + dump_orphan_list(sb, sbi); + J_ASSERT(list_empty(&sbi->s_orphan)); + + invalidate_bdev(sb->s_bdev); + if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { + /* + * Invalidate the journal device's buffers. We don't want them + * floating about in memory - the physical journal device may + * hotswapped, and it breaks the `ro-after' testing code. + */ + sync_blockdev(sbi->journal_bdev); + invalidate_bdev(sbi->journal_bdev); + ext3_blkdev_remove(sbi); + } + sb->s_fs_info = NULL; + kfree(sbi->s_blockgroup_lock); + mutex_destroy(&sbi->s_orphan_lock); + mutex_destroy(&sbi->s_resize_lock); + kfree(sbi); +} + +static struct kmem_cache *ext3_inode_cachep; + +/* + * Called inside transaction, so use GFP_NOFS + */ +static struct inode *ext3_alloc_inode(struct super_block *sb) +{ + struct ext3_inode_info *ei; + + ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS); + if (!ei) + return NULL; + ei->i_block_alloc_info = NULL; + ei->vfs_inode.i_version = 1; + atomic_set(&ei->i_datasync_tid, 0); + atomic_set(&ei->i_sync_tid, 0); +#ifdef CONFIG_QUOTA + memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); +#endif + + return &ei->vfs_inode; +} + +static int ext3_drop_inode(struct inode *inode) +{ + int drop = generic_drop_inode(inode); + + trace_ext3_drop_inode(inode, drop); + return drop; +} + +static void ext3_i_callback(struct rcu_head *head) +{ + struct inode *inode = container_of(head, struct inode, i_rcu); + kmem_cache_free(ext3_inode_cachep, EXT3_I(inode)); +} + +static void ext3_destroy_inode(struct inode *inode) +{ + if (!list_empty(&(EXT3_I(inode)->i_orphan))) { + printk("EXT3 Inode %p: orphan list check failed!\n", + EXT3_I(inode)); + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, + EXT3_I(inode), sizeof(struct ext3_inode_info), + false); + dump_stack(); + } + call_rcu(&inode->i_rcu, ext3_i_callback); +} + +static void init_once(void *foo) +{ + struct ext3_inode_info *ei = (struct ext3_inode_info *) foo; + + INIT_LIST_HEAD(&ei->i_orphan); +#ifdef CONFIG_EXT3_FS_XATTR + init_rwsem(&ei->xattr_sem); +#endif + mutex_init(&ei->truncate_mutex); + inode_init_once(&ei->vfs_inode); +} + +static int __init init_inodecache(void) +{ + ext3_inode_cachep = kmem_cache_create("ext3_inode_cache", + sizeof(struct ext3_inode_info), + 0, (SLAB_RECLAIM_ACCOUNT| + SLAB_MEM_SPREAD), + init_once); + if (ext3_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(ext3_inode_cachep); +} + +static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb) +{ +#if defined(CONFIG_QUOTA) + struct ext3_sb_info *sbi = EXT3_SB(sb); + + if (sbi->s_jquota_fmt) { + char *fmtname = ""; + + switch (sbi->s_jquota_fmt) { + case QFMT_VFS_OLD: + fmtname = "vfsold"; + break; + case QFMT_VFS_V0: + fmtname = "vfsv0"; + break; + case QFMT_VFS_V1: + fmtname = "vfsv1"; + break; + } + seq_printf(seq, ",jqfmt=%s", fmtname); + } + + if (sbi->s_qf_names[USRQUOTA]) + seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); + + if (sbi->s_qf_names[GRPQUOTA]) + seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); + + if (test_opt(sb, USRQUOTA)) + seq_puts(seq, ",usrquota"); + + if (test_opt(sb, GRPQUOTA)) + seq_puts(seq, ",grpquota"); +#endif +} + +static char *data_mode_string(unsigned long mode) +{ + switch (mode) { + case EXT3_MOUNT_JOURNAL_DATA: + return "journal"; + case EXT3_MOUNT_ORDERED_DATA: + return "ordered"; + case EXT3_MOUNT_WRITEBACK_DATA: + return "writeback"; + } + return "unknown"; +} + +/* + * Show an option if + * - it's set to a non-default value OR + * - if the per-sb default is different from the global default + */ +static int ext3_show_options(struct seq_file *seq, struct dentry *root) +{ + struct super_block *sb = root->d_sb; + struct ext3_sb_info *sbi = EXT3_SB(sb); + struct ext3_super_block *es = sbi->s_es; + unsigned long def_mount_opts; + + def_mount_opts = le32_to_cpu(es->s_default_mount_opts); + + if (sbi->s_sb_block != 1) + seq_printf(seq, ",sb=%lu", sbi->s_sb_block); + if (test_opt(sb, MINIX_DF)) + seq_puts(seq, ",minixdf"); + if (test_opt(sb, GRPID)) + seq_puts(seq, ",grpid"); + if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS)) + seq_puts(seq, ",nogrpid"); + if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) || + le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) { + seq_printf(seq, ",resuid=%u", + from_kuid_munged(&init_user_ns, sbi->s_resuid)); + } + if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) || + le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) { + seq_printf(seq, ",resgid=%u", + from_kgid_munged(&init_user_ns, sbi->s_resgid)); + } + if (test_opt(sb, ERRORS_RO)) { + int def_errors = le16_to_cpu(es->s_errors); + + if (def_errors == EXT3_ERRORS_PANIC || + def_errors == EXT3_ERRORS_CONTINUE) { + seq_puts(seq, ",errors=remount-ro"); + } + } + if (test_opt(sb, ERRORS_CONT)) + seq_puts(seq, ",errors=continue"); + if (test_opt(sb, ERRORS_PANIC)) + seq_puts(seq, ",errors=panic"); + if (test_opt(sb, NO_UID32)) + seq_puts(seq, ",nouid32"); + if (test_opt(sb, DEBUG)) + seq_puts(seq, ",debug"); +#ifdef CONFIG_EXT3_FS_XATTR + if (test_opt(sb, XATTR_USER)) + seq_puts(seq, ",user_xattr"); + if (!test_opt(sb, XATTR_USER) && + (def_mount_opts & EXT3_DEFM_XATTR_USER)) { + seq_puts(seq, ",nouser_xattr"); + } +#endif +#ifdef CONFIG_EXT3_FS_POSIX_ACL + if (test_opt(sb, POSIX_ACL)) + seq_puts(seq, ",acl"); + if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL)) + seq_puts(seq, ",noacl"); +#endif + if (!test_opt(sb, RESERVATION)) + seq_puts(seq, ",noreservation"); + if (sbi->s_commit_interval) { + seq_printf(seq, ",commit=%u", + (unsigned) (sbi->s_commit_interval / HZ)); + } + + /* + * Always display barrier state so it's clear what the status is. + */ + seq_puts(seq, ",barrier="); + seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); + seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS))); + if (test_opt(sb, DATA_ERR_ABORT)) + seq_puts(seq, ",data_err=abort"); + + if (test_opt(sb, NOLOAD)) + seq_puts(seq, ",norecovery"); + + ext3_show_quota_options(seq, sb); + + return 0; +} + + +static struct inode *ext3_nfs_get_inode(struct super_block *sb, + u64 ino, u32 generation) +{ + struct inode *inode; + + if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO) + return ERR_PTR(-ESTALE); + if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count)) + return ERR_PTR(-ESTALE); + + /* iget isn't really right if the inode is currently unallocated!! + * + * ext3_read_inode will return a bad_inode if the inode had been + * deleted, so we should be safe. + * + * Currently we don't know the generation for parent directory, so + * a generation of 0 means "accept any" + */ + inode = ext3_iget(sb, ino); + if (IS_ERR(inode)) + return ERR_CAST(inode); + if (generation && inode->i_generation != generation) { + iput(inode); + return ERR_PTR(-ESTALE); + } + + return inode; +} + +static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid, + int fh_len, int fh_type) +{ + return generic_fh_to_dentry(sb, fid, fh_len, fh_type, + ext3_nfs_get_inode); +} + +static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid, + int fh_len, int fh_type) +{ + return generic_fh_to_parent(sb, fid, fh_len, fh_type, + ext3_nfs_get_inode); +} + +/* + * Try to release metadata pages (indirect blocks, directories) which are + * mapped via the block device. Since these pages could have journal heads + * which would prevent try_to_free_buffers() from freeing them, we must use + * jbd layer's try_to_free_buffers() function to release them. + */ +static int bdev_try_to_free_page(struct super_block *sb, struct page *page, + gfp_t wait) +{ + journal_t *journal = EXT3_SB(sb)->s_journal; + + WARN_ON(PageChecked(page)); + if (!page_has_buffers(page)) + return 0; + if (journal) + return journal_try_to_free_buffers(journal, page, + wait & ~__GFP_WAIT); + return try_to_free_buffers(page); +} + +#ifdef CONFIG_QUOTA +#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") +#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) + +static int ext3_write_dquot(struct dquot *dquot); +static int ext3_acquire_dquot(struct dquot *dquot); +static int ext3_release_dquot(struct dquot *dquot); +static int ext3_mark_dquot_dirty(struct dquot *dquot); +static int ext3_write_info(struct super_block *sb, int type); +static int ext3_quota_on(struct super_block *sb, int type, int format_id, + struct path *path); +static int ext3_quota_on_mount(struct super_block *sb, int type); +static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off); +static ssize_t ext3_quota_write(struct super_block *sb, int type, + const char *data, size_t len, loff_t off); +static struct dquot **ext3_get_dquots(struct inode *inode) +{ + return EXT3_I(inode)->i_dquot; +} + +static const struct dquot_operations ext3_quota_operations = { + .write_dquot = ext3_write_dquot, + .acquire_dquot = ext3_acquire_dquot, + .release_dquot = ext3_release_dquot, + .mark_dirty = ext3_mark_dquot_dirty, + .write_info = ext3_write_info, + .alloc_dquot = dquot_alloc, + .destroy_dquot = dquot_destroy, +}; + +static const struct quotactl_ops ext3_qctl_operations = { + .quota_on = ext3_quota_on, + .quota_off = dquot_quota_off, + .quota_sync = dquot_quota_sync, + .get_state = dquot_get_state, + .set_info = dquot_set_dqinfo, + .get_dqblk = dquot_get_dqblk, + .set_dqblk = dquot_set_dqblk +}; +#endif + +static const struct super_operations ext3_sops = { + .alloc_inode = ext3_alloc_inode, + .destroy_inode = ext3_destroy_inode, + .write_inode = ext3_write_inode, + .dirty_inode = ext3_dirty_inode, + .drop_inode = ext3_drop_inode, + .evict_inode = ext3_evict_inode, + .put_super = ext3_put_super, + .sync_fs = ext3_sync_fs, + .freeze_fs = ext3_freeze, + .unfreeze_fs = ext3_unfreeze, + .statfs = ext3_statfs, + .remount_fs = ext3_remount, + .show_options = ext3_show_options, +#ifdef CONFIG_QUOTA + .quota_read = ext3_quota_read, + .quota_write = ext3_quota_write, + .get_dquots = ext3_get_dquots, +#endif + .bdev_try_to_free_page = bdev_try_to_free_page, +}; + +static const struct export_operations ext3_export_ops = { + .fh_to_dentry = ext3_fh_to_dentry, + .fh_to_parent = ext3_fh_to_parent, + .get_parent = ext3_get_parent, +}; + +enum { + Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, + Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, + Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, + Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, + Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, + Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, + Opt_journal_path, + Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, + Opt_data_err_abort, Opt_data_err_ignore, + Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, + Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, + Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, + Opt_resize, Opt_usrquota, Opt_grpquota +}; + +static const match_table_t tokens = { + {Opt_bsd_df, "bsddf"}, + {Opt_minix_df, "minixdf"}, + {Opt_grpid, "grpid"}, + {Opt_grpid, "bsdgroups"}, + {Opt_nogrpid, "nogrpid"}, + {Opt_nogrpid, "sysvgroups"}, + {Opt_resgid, "resgid=%u"}, + {Opt_resuid, "resuid=%u"}, + {Opt_sb, "sb=%u"}, + {Opt_err_cont, "errors=continue"}, + {Opt_err_panic, "errors=panic"}, + {Opt_err_ro, "errors=remount-ro"}, + {Opt_nouid32, "nouid32"}, + {Opt_nocheck, "nocheck"}, + {Opt_nocheck, "check=none"}, + {Opt_debug, "debug"}, + {Opt_oldalloc, "oldalloc"}, + {Opt_orlov, "orlov"}, + {Opt_user_xattr, "user_xattr"}, + {Opt_nouser_xattr, "nouser_xattr"}, + {Opt_acl, "acl"}, + {Opt_noacl, "noacl"}, + {Opt_reservation, "reservation"}, + {Opt_noreservation, "noreservation"}, + {Opt_noload, "noload"}, + {Opt_noload, "norecovery"}, + {Opt_nobh, "nobh"}, + {Opt_bh, "bh"}, + {Opt_commit, "commit=%u"}, + {Opt_journal_update, "journal=update"}, + {Opt_journal_inum, "journal=%u"}, + {Opt_journal_dev, "journal_dev=%u"}, + {Opt_journal_path, "journal_path=%s"}, + {Opt_abort, "abort"}, + {Opt_data_journal, "data=journal"}, + {Opt_data_ordered, "data=ordered"}, + {Opt_data_writeback, "data=writeback"}, + {Opt_data_err_abort, "data_err=abort"}, + {Opt_data_err_ignore, "data_err=ignore"}, + {Opt_offusrjquota, "usrjquota="}, + {Opt_usrjquota, "usrjquota=%s"}, + {Opt_offgrpjquota, "grpjquota="}, + {Opt_grpjquota, "grpjquota=%s"}, + {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, + {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, + {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, + {Opt_grpquota, "grpquota"}, + {Opt_noquota, "noquota"}, + {Opt_quota, "quota"}, + {Opt_usrquota, "usrquota"}, + {Opt_barrier, "barrier=%u"}, + {Opt_barrier, "barrier"}, + {Opt_nobarrier, "nobarrier"}, + {Opt_resize, "resize"}, + {Opt_err, NULL}, +}; + +static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb) +{ + ext3_fsblk_t sb_block; + char *options = (char *) *data; + + if (!options || strncmp(options, "sb=", 3) != 0) + return 1; /* Default location */ + options += 3; + /*todo: use simple_strtoll with >32bit ext3 */ + sb_block = simple_strtoul(options, &options, 0); + if (*options && *options != ',') { + ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s", + (char *) *data); + return 1; + } + if (*options == ',') + options++; + *data = (void *) options; + return sb_block; +} + +#ifdef CONFIG_QUOTA +static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + char *qname; + + if (sb_any_quota_loaded(sb) && + !sbi->s_qf_names[qtype]) { + ext3_msg(sb, KERN_ERR, + "Cannot change journaled " + "quota options when quota turned on"); + return 0; + } + qname = match_strdup(args); + if (!qname) { + ext3_msg(sb, KERN_ERR, + "Not enough memory for storing quotafile name"); + return 0; + } + if (sbi->s_qf_names[qtype]) { + int same = !strcmp(sbi->s_qf_names[qtype], qname); + + kfree(qname); + if (!same) { + ext3_msg(sb, KERN_ERR, + "%s quota file already specified", + QTYPE2NAME(qtype)); + } + return same; + } + if (strchr(qname, '/')) { + ext3_msg(sb, KERN_ERR, + "quotafile must be on filesystem root"); + kfree(qname); + return 0; + } + sbi->s_qf_names[qtype] = qname; + set_opt(sbi->s_mount_opt, QUOTA); + return 1; +} + +static int clear_qf_name(struct super_block *sb, int qtype) { + + struct ext3_sb_info *sbi = EXT3_SB(sb); + + if (sb_any_quota_loaded(sb) && + sbi->s_qf_names[qtype]) { + ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options" + " when quota turned on"); + return 0; + } + if (sbi->s_qf_names[qtype]) { + kfree(sbi->s_qf_names[qtype]); + sbi->s_qf_names[qtype] = NULL; + } + return 1; +} +#endif + +static int parse_options (char *options, struct super_block *sb, + unsigned int *inum, unsigned long *journal_devnum, + ext3_fsblk_t *n_blocks_count, int is_remount) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + char * p; + substring_t args[MAX_OPT_ARGS]; + int data_opt = 0; + int option; + kuid_t uid; + kgid_t gid; + char *journal_path; + struct inode *journal_inode; + struct path path; + int error; + +#ifdef CONFIG_QUOTA + int qfmt; +#endif + + if (!options) + return 1; + + while ((p = strsep (&options, ",")) != NULL) { + int token; + if (!*p) + continue; + /* + * Initialize args struct so we know whether arg was + * found; some options take optional arguments. + */ + args[0].to = args[0].from = NULL; + token = match_token(p, tokens, args); + switch (token) { + case Opt_bsd_df: + clear_opt (sbi->s_mount_opt, MINIX_DF); + break; + case Opt_minix_df: + set_opt (sbi->s_mount_opt, MINIX_DF); + break; + case Opt_grpid: + set_opt (sbi->s_mount_opt, GRPID); + break; + case Opt_nogrpid: + clear_opt (sbi->s_mount_opt, GRPID); + break; + case Opt_resuid: + if (match_int(&args[0], &option)) + return 0; + uid = make_kuid(current_user_ns(), option); + if (!uid_valid(uid)) { + ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option); + return 0; + + } + sbi->s_resuid = uid; + break; + case Opt_resgid: + if (match_int(&args[0], &option)) + return 0; + gid = make_kgid(current_user_ns(), option); + if (!gid_valid(gid)) { + ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option); + return 0; + } + sbi->s_resgid = gid; + break; + case Opt_sb: + /* handled by get_sb_block() instead of here */ + /* *sb_block = match_int(&args[0]); */ + break; + case Opt_err_panic: + clear_opt (sbi->s_mount_opt, ERRORS_CONT); + clear_opt (sbi->s_mount_opt, ERRORS_RO); + set_opt (sbi->s_mount_opt, ERRORS_PANIC); + break; + case Opt_err_ro: + clear_opt (sbi->s_mount_opt, ERRORS_CONT); + clear_opt (sbi->s_mount_opt, ERRORS_PANIC); + set_opt (sbi->s_mount_opt, ERRORS_RO); + break; + case Opt_err_cont: + clear_opt (sbi->s_mount_opt, ERRORS_RO); + clear_opt (sbi->s_mount_opt, ERRORS_PANIC); + set_opt (sbi->s_mount_opt, ERRORS_CONT); + break; + case Opt_nouid32: + set_opt (sbi->s_mount_opt, NO_UID32); + break; + case Opt_nocheck: + clear_opt (sbi->s_mount_opt, CHECK); + break; + case Opt_debug: + set_opt (sbi->s_mount_opt, DEBUG); + break; + case Opt_oldalloc: + ext3_msg(sb, KERN_WARNING, + "Ignoring deprecated oldalloc option"); + break; + case Opt_orlov: + ext3_msg(sb, KERN_WARNING, + "Ignoring deprecated orlov option"); + break; +#ifdef CONFIG_EXT3_FS_XATTR + case Opt_user_xattr: + set_opt (sbi->s_mount_opt, XATTR_USER); + break; + case Opt_nouser_xattr: + clear_opt (sbi->s_mount_opt, XATTR_USER); + break; +#else + case Opt_user_xattr: + case Opt_nouser_xattr: + ext3_msg(sb, KERN_INFO, + "(no)user_xattr options not supported"); + break; +#endif +#ifdef CONFIG_EXT3_FS_POSIX_ACL + case Opt_acl: + set_opt(sbi->s_mount_opt, POSIX_ACL); + break; + case Opt_noacl: + clear_opt(sbi->s_mount_opt, POSIX_ACL); + break; +#else + case Opt_acl: + case Opt_noacl: + ext3_msg(sb, KERN_INFO, + "(no)acl options not supported"); + break; +#endif + case Opt_reservation: + set_opt(sbi->s_mount_opt, RESERVATION); + break; + case Opt_noreservation: + clear_opt(sbi->s_mount_opt, RESERVATION); + break; + case Opt_journal_update: + /* @@@ FIXME */ + /* Eventually we will want to be able to create + a journal file here. For now, only allow the + user to specify an existing inode to be the + journal file. */ + if (is_remount) { + ext3_msg(sb, KERN_ERR, "error: cannot specify " + "journal on remount"); + return 0; + } + set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); + break; + case Opt_journal_inum: + if (is_remount) { + ext3_msg(sb, KERN_ERR, "error: cannot specify " + "journal on remount"); + return 0; + } + if (match_int(&args[0], &option)) + return 0; + *inum = option; + break; + case Opt_journal_dev: + if (is_remount) { + ext3_msg(sb, KERN_ERR, "error: cannot specify " + "journal on remount"); + return 0; + } + if (match_int(&args[0], &option)) + return 0; + *journal_devnum = option; + break; + case Opt_journal_path: + if (is_remount) { + ext3_msg(sb, KERN_ERR, "error: cannot specify " + "journal on remount"); + return 0; + } + + journal_path = match_strdup(&args[0]); + if (!journal_path) { + ext3_msg(sb, KERN_ERR, "error: could not dup " + "journal device string"); + return 0; + } + + error = kern_path(journal_path, LOOKUP_FOLLOW, &path); + if (error) { + ext3_msg(sb, KERN_ERR, "error: could not find " + "journal device path: error %d", error); + kfree(journal_path); + return 0; + } + + journal_inode = d_inode(path.dentry); + if (!S_ISBLK(journal_inode->i_mode)) { + ext3_msg(sb, KERN_ERR, "error: journal path %s " + "is not a block device", journal_path); + path_put(&path); + kfree(journal_path); + return 0; + } + + *journal_devnum = new_encode_dev(journal_inode->i_rdev); + path_put(&path); + kfree(journal_path); + break; + case Opt_noload: + set_opt (sbi->s_mount_opt, NOLOAD); + break; + case Opt_commit: + if (match_int(&args[0], &option)) + return 0; + if (option < 0) + return 0; + if (option == 0) + option = JBD_DEFAULT_MAX_COMMIT_AGE; + sbi->s_commit_interval = HZ * option; + break; + case Opt_data_journal: + data_opt = EXT3_MOUNT_JOURNAL_DATA; + goto datacheck; + case Opt_data_ordered: + data_opt = EXT3_MOUNT_ORDERED_DATA; + goto datacheck; + case Opt_data_writeback: + data_opt = EXT3_MOUNT_WRITEBACK_DATA; + datacheck: + if (is_remount) { + if (test_opt(sb, DATA_FLAGS) == data_opt) + break; + ext3_msg(sb, KERN_ERR, + "error: cannot change " + "data mode on remount. The filesystem " + "is mounted in data=%s mode and you " + "try to remount it in data=%s mode.", + data_mode_string(test_opt(sb, + DATA_FLAGS)), + data_mode_string(data_opt)); + return 0; + } else { + clear_opt(sbi->s_mount_opt, DATA_FLAGS); + sbi->s_mount_opt |= data_opt; + } + break; + case Opt_data_err_abort: + set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); + break; + case Opt_data_err_ignore: + clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); + break; +#ifdef CONFIG_QUOTA + case Opt_usrjquota: + if (!set_qf_name(sb, USRQUOTA, &args[0])) + return 0; + break; + case Opt_grpjquota: + if (!set_qf_name(sb, GRPQUOTA, &args[0])) + return 0; + break; + case Opt_offusrjquota: + if (!clear_qf_name(sb, USRQUOTA)) + return 0; + break; + case Opt_offgrpjquota: + if (!clear_qf_name(sb, GRPQUOTA)) + return 0; + break; + case Opt_jqfmt_vfsold: + qfmt = QFMT_VFS_OLD; + goto set_qf_format; + case Opt_jqfmt_vfsv0: + qfmt = QFMT_VFS_V0; + goto set_qf_format; + case Opt_jqfmt_vfsv1: + qfmt = QFMT_VFS_V1; +set_qf_format: + if (sb_any_quota_loaded(sb) && + sbi->s_jquota_fmt != qfmt) { + ext3_msg(sb, KERN_ERR, "error: cannot change " + "journaled quota options when " + "quota turned on."); + return 0; + } + sbi->s_jquota_fmt = qfmt; + break; + case Opt_quota: + case Opt_usrquota: + set_opt(sbi->s_mount_opt, QUOTA); + set_opt(sbi->s_mount_opt, USRQUOTA); + break; + case Opt_grpquota: + set_opt(sbi->s_mount_opt, QUOTA); + set_opt(sbi->s_mount_opt, GRPQUOTA); + break; + case Opt_noquota: + if (sb_any_quota_loaded(sb)) { + ext3_msg(sb, KERN_ERR, "error: cannot change " + "quota options when quota turned on."); + return 0; + } + clear_opt(sbi->s_mount_opt, QUOTA); + clear_opt(sbi->s_mount_opt, USRQUOTA); + clear_opt(sbi->s_mount_opt, GRPQUOTA); + break; +#else + case Opt_quota: + case Opt_usrquota: + case Opt_grpquota: + ext3_msg(sb, KERN_ERR, + "error: quota options not supported."); + break; + case Opt_usrjquota: + case Opt_grpjquota: + case Opt_offusrjquota: + case Opt_offgrpjquota: + case Opt_jqfmt_vfsold: + case Opt_jqfmt_vfsv0: + case Opt_jqfmt_vfsv1: + ext3_msg(sb, KERN_ERR, + "error: journaled quota options not " + "supported."); + break; + case Opt_noquota: + break; +#endif + case Opt_abort: + set_opt(sbi->s_mount_opt, ABORT); + break; + case Opt_nobarrier: + clear_opt(sbi->s_mount_opt, BARRIER); + break; + case Opt_barrier: + if (args[0].from) { + if (match_int(&args[0], &option)) + return 0; + } else + option = 1; /* No argument, default to 1 */ + if (option) + set_opt(sbi->s_mount_opt, BARRIER); + else + clear_opt(sbi->s_mount_opt, BARRIER); + break; + case Opt_ignore: + break; + case Opt_resize: + if (!is_remount) { + ext3_msg(sb, KERN_ERR, + "error: resize option only available " + "for remount"); + return 0; + } + if (match_int(&args[0], &option) != 0) + return 0; + *n_blocks_count = option; + break; + case Opt_nobh: + ext3_msg(sb, KERN_WARNING, + "warning: ignoring deprecated nobh option"); + break; + case Opt_bh: + ext3_msg(sb, KERN_WARNING, + "warning: ignoring deprecated bh option"); + break; + default: + ext3_msg(sb, KERN_ERR, + "error: unrecognized mount option \"%s\" " + "or missing value", p); + return 0; + } + } +#ifdef CONFIG_QUOTA + if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { + if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) + clear_opt(sbi->s_mount_opt, USRQUOTA); + if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) + clear_opt(sbi->s_mount_opt, GRPQUOTA); + + if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { + ext3_msg(sb, KERN_ERR, "error: old and new quota " + "format mixing."); + return 0; + } + + if (!sbi->s_jquota_fmt) { + ext3_msg(sb, KERN_ERR, "error: journaled quota format " + "not specified."); + return 0; + } + } +#endif + return 1; +} + +static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es, + int read_only) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + int res = 0; + + if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) { + ext3_msg(sb, KERN_ERR, + "error: revision level too high, " + "forcing read-only mode"); + res = MS_RDONLY; + } + if (read_only) + return res; + if (!(sbi->s_mount_state & EXT3_VALID_FS)) + ext3_msg(sb, KERN_WARNING, + "warning: mounting unchecked fs, " + "running e2fsck is recommended"); + else if ((sbi->s_mount_state & EXT3_ERROR_FS)) + ext3_msg(sb, KERN_WARNING, + "warning: mounting fs with errors, " + "running e2fsck is recommended"); + else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && + le16_to_cpu(es->s_mnt_count) >= + le16_to_cpu(es->s_max_mnt_count)) + ext3_msg(sb, KERN_WARNING, + "warning: maximal mount count reached, " + "running e2fsck is recommended"); + else if (le32_to_cpu(es->s_checkinterval) && + (le32_to_cpu(es->s_lastcheck) + + le32_to_cpu(es->s_checkinterval) <= get_seconds())) + ext3_msg(sb, KERN_WARNING, + "warning: checktime reached, " + "running e2fsck is recommended"); +#if 0 + /* @@@ We _will_ want to clear the valid bit if we find + inconsistencies, to force a fsck at reboot. But for + a plain journaled filesystem we can keep it set as + valid forever! :) */ + es->s_state &= cpu_to_le16(~EXT3_VALID_FS); +#endif + if (!le16_to_cpu(es->s_max_mnt_count)) + es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT); + le16_add_cpu(&es->s_mnt_count, 1); + es->s_mtime = cpu_to_le32(get_seconds()); + ext3_update_dynamic_rev(sb); + EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); + + ext3_commit_super(sb, es, 1); + if (test_opt(sb, DEBUG)) + ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, " + "bpg=%lu, ipg=%lu, mo=%04lx]", + sb->s_blocksize, + sbi->s_groups_count, + EXT3_BLOCKS_PER_GROUP(sb), + EXT3_INODES_PER_GROUP(sb), + sbi->s_mount_opt); + + if (EXT3_SB(sb)->s_journal->j_inode == NULL) { + char b[BDEVNAME_SIZE]; + ext3_msg(sb, KERN_INFO, "using external journal on %s", + bdevname(EXT3_SB(sb)->s_journal->j_dev, b)); + } else { + ext3_msg(sb, KERN_INFO, "using internal journal"); + } + cleancache_init_fs(sb); + return res; +} + +/* Called at mount-time, super-block is locked */ +static int ext3_check_descriptors(struct super_block *sb) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + int i; + + ext3_debug ("Checking group descriptors"); + + for (i = 0; i < sbi->s_groups_count; i++) { + struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL); + ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i); + ext3_fsblk_t last_block; + + if (i == sbi->s_groups_count - 1) + last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; + else + last_block = first_block + + (EXT3_BLOCKS_PER_GROUP(sb) - 1); + + if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || + le32_to_cpu(gdp->bg_block_bitmap) > last_block) + { + ext3_error (sb, "ext3_check_descriptors", + "Block bitmap for group %d" + " not in group (block %lu)!", + i, (unsigned long) + le32_to_cpu(gdp->bg_block_bitmap)); + return 0; + } + if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || + le32_to_cpu(gdp->bg_inode_bitmap) > last_block) + { + ext3_error (sb, "ext3_check_descriptors", + "Inode bitmap for group %d" + " not in group (block %lu)!", + i, (unsigned long) + le32_to_cpu(gdp->bg_inode_bitmap)); + return 0; + } + if (le32_to_cpu(gdp->bg_inode_table) < first_block || + le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > + last_block) + { + ext3_error (sb, "ext3_check_descriptors", + "Inode table for group %d" + " not in group (block %lu)!", + i, (unsigned long) + le32_to_cpu(gdp->bg_inode_table)); + return 0; + } + } + + sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb)); + sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb)); + return 1; +} + + +/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at + * the superblock) which were deleted from all directories, but held open by + * a process at the time of a crash. We walk the list and try to delete these + * inodes at recovery time (only with a read-write filesystem). + * + * In order to keep the orphan inode chain consistent during traversal (in + * case of crash during recovery), we link each inode into the superblock + * orphan list_head and handle it the same way as an inode deletion during + * normal operation (which journals the operations for us). + * + * We only do an iget() and an iput() on each inode, which is very safe if we + * accidentally point at an in-use or already deleted inode. The worst that + * can happen in this case is that we get a "bit already cleared" message from + * ext3_free_inode(). The only reason we would point at a wrong inode is if + * e2fsck was run on this filesystem, and it must have already done the orphan + * inode cleanup for us, so we can safely abort without any further action. + */ +static void ext3_orphan_cleanup (struct super_block * sb, + struct ext3_super_block * es) +{ + unsigned int s_flags = sb->s_flags; + int nr_orphans = 0, nr_truncates = 0; +#ifdef CONFIG_QUOTA + int i; +#endif + if (!es->s_last_orphan) { + jbd_debug(4, "no orphan inodes to clean up\n"); + return; + } + + if (bdev_read_only(sb->s_bdev)) { + ext3_msg(sb, KERN_ERR, "error: write access " + "unavailable, skipping orphan cleanup."); + return; + } + + /* Check if feature set allows readwrite operations */ + if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) { + ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " + "unknown ROCOMPAT features"); + return; + } + + if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) { + /* don't clear list on RO mount w/ errors */ + if (es->s_last_orphan && !(s_flags & MS_RDONLY)) { + jbd_debug(1, "Errors on filesystem, " + "clearing orphan list.\n"); + es->s_last_orphan = 0; + } + jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); + return; + } + + if (s_flags & MS_RDONLY) { + ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); + sb->s_flags &= ~MS_RDONLY; + } +#ifdef CONFIG_QUOTA + /* Needed for iput() to work correctly and not trash data */ + sb->s_flags |= MS_ACTIVE; + /* Turn on quotas so that they are updated correctly */ + for (i = 0; i < EXT3_MAXQUOTAS; i++) { + if (EXT3_SB(sb)->s_qf_names[i]) { + int ret = ext3_quota_on_mount(sb, i); + if (ret < 0) + ext3_msg(sb, KERN_ERR, + "error: cannot turn on journaled " + "quota: %d", ret); + } + } +#endif + + while (es->s_last_orphan) { + struct inode *inode; + + inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); + if (IS_ERR(inode)) { + es->s_last_orphan = 0; + break; + } + + list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan); + dquot_initialize(inode); + if (inode->i_nlink) { + printk(KERN_DEBUG + "%s: truncating inode %lu to %Ld bytes\n", + __func__, inode->i_ino, inode->i_size); + jbd_debug(2, "truncating inode %lu to %Ld bytes\n", + inode->i_ino, inode->i_size); + ext3_truncate(inode); + nr_truncates++; + } else { + printk(KERN_DEBUG + "%s: deleting unreferenced inode %lu\n", + __func__, inode->i_ino); + jbd_debug(2, "deleting unreferenced inode %lu\n", + inode->i_ino); + nr_orphans++; + } + iput(inode); /* The delete magic happens here! */ + } + +#define PLURAL(x) (x), ((x)==1) ? "" : "s" + + if (nr_orphans) + ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted", + PLURAL(nr_orphans)); + if (nr_truncates) + ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up", + PLURAL(nr_truncates)); +#ifdef CONFIG_QUOTA + /* Turn quotas off */ + for (i = 0; i < EXT3_MAXQUOTAS; i++) { + if (sb_dqopt(sb)->files[i]) + dquot_quota_off(sb, i); + } +#endif + sb->s_flags = s_flags; /* Restore MS_RDONLY status */ +} + +/* + * Maximal file size. There is a direct, and {,double-,triple-}indirect + * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. + * We need to be 1 filesystem block less than the 2^32 sector limit. + */ +static loff_t ext3_max_size(int bits) +{ + loff_t res = EXT3_NDIR_BLOCKS; + int meta_blocks; + loff_t upper_limit; + + /* This is calculated to be the largest file size for a + * dense, file such that the total number of + * sectors in the file, including data and all indirect blocks, + * does not exceed 2^32 -1 + * __u32 i_blocks representing the total number of + * 512 bytes blocks of the file + */ + upper_limit = (1LL << 32) - 1; + + /* total blocks in file system block size */ + upper_limit >>= (bits - 9); + + + /* indirect blocks */ + meta_blocks = 1; + /* double indirect blocks */ + meta_blocks += 1 + (1LL << (bits-2)); + /* tripple indirect blocks */ + meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); + + upper_limit -= meta_blocks; + upper_limit <<= bits; + + res += 1LL << (bits-2); + res += 1LL << (2*(bits-2)); + res += 1LL << (3*(bits-2)); + res <<= bits; + if (res > upper_limit) + res = upper_limit; + + if (res > MAX_LFS_FILESIZE) + res = MAX_LFS_FILESIZE; + + return res; +} + +static ext3_fsblk_t descriptor_loc(struct super_block *sb, + ext3_fsblk_t logic_sb_block, + int nr) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + unsigned long bg, first_meta_bg; + int has_super = 0; + + first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); + + if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) || + nr < first_meta_bg) + return (logic_sb_block + nr + 1); + bg = sbi->s_desc_per_block * nr; + if (ext3_bg_has_super(sb, bg)) + has_super = 1; + return (has_super + ext3_group_first_block_no(sb, bg)); +} + + +static int ext3_fill_super (struct super_block *sb, void *data, int silent) +{ + struct buffer_head * bh; + struct ext3_super_block *es = NULL; + struct ext3_sb_info *sbi; + ext3_fsblk_t block; + ext3_fsblk_t sb_block = get_sb_block(&data, sb); + ext3_fsblk_t logic_sb_block; + unsigned long offset = 0; + unsigned int journal_inum = 0; + unsigned long journal_devnum = 0; + unsigned long def_mount_opts; + struct inode *root; + int blocksize; + int hblock; + int db_count; + int i; + int needs_recovery; + int ret = -EINVAL; + __le32 features; + int err; + + sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); + if (!sbi) + return -ENOMEM; + + sbi->s_blockgroup_lock = + kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); + if (!sbi->s_blockgroup_lock) { + kfree(sbi); + return -ENOMEM; + } + sb->s_fs_info = sbi; + sbi->s_sb_block = sb_block; + + blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE); + if (!blocksize) { + ext3_msg(sb, KERN_ERR, "error: unable to set blocksize"); + goto out_fail; + } + + /* + * The ext3 superblock will not be buffer aligned for other than 1kB + * block sizes. We need to calculate the offset from buffer start. + */ + if (blocksize != EXT3_MIN_BLOCK_SIZE) { + logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; + offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; + } else { + logic_sb_block = sb_block; + } + + if (!(bh = sb_bread(sb, logic_sb_block))) { + ext3_msg(sb, KERN_ERR, "error: unable to read superblock"); + goto out_fail; + } + /* + * Note: s_es must be initialized as soon as possible because + * some ext3 macro-instructions depend on its value + */ + es = (struct ext3_super_block *) (bh->b_data + offset); + sbi->s_es = es; + sb->s_magic = le16_to_cpu(es->s_magic); + if (sb->s_magic != EXT3_SUPER_MAGIC) + goto cantfind_ext3; + + /* Set defaults before we parse the mount options */ + def_mount_opts = le32_to_cpu(es->s_default_mount_opts); + if (def_mount_opts & EXT3_DEFM_DEBUG) + set_opt(sbi->s_mount_opt, DEBUG); + if (def_mount_opts & EXT3_DEFM_BSDGROUPS) + set_opt(sbi->s_mount_opt, GRPID); + if (def_mount_opts & EXT3_DEFM_UID16) + set_opt(sbi->s_mount_opt, NO_UID32); +#ifdef CONFIG_EXT3_FS_XATTR + if (def_mount_opts & EXT3_DEFM_XATTR_USER) + set_opt(sbi->s_mount_opt, XATTR_USER); +#endif +#ifdef CONFIG_EXT3_FS_POSIX_ACL + if (def_mount_opts & EXT3_DEFM_ACL) + set_opt(sbi->s_mount_opt, POSIX_ACL); +#endif + if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA) + set_opt(sbi->s_mount_opt, JOURNAL_DATA); + else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED) + set_opt(sbi->s_mount_opt, ORDERED_DATA); + else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK) + set_opt(sbi->s_mount_opt, WRITEBACK_DATA); + + if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC) + set_opt(sbi->s_mount_opt, ERRORS_PANIC); + else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE) + set_opt(sbi->s_mount_opt, ERRORS_CONT); + else + set_opt(sbi->s_mount_opt, ERRORS_RO); + + sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); + sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); + + /* enable barriers by default */ + set_opt(sbi->s_mount_opt, BARRIER); + set_opt(sbi->s_mount_opt, RESERVATION); + + if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, + NULL, 0)) + goto failed_mount; + + sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | + (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); + + if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV && + (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) || + EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) || + EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U))) + ext3_msg(sb, KERN_WARNING, + "warning: feature flags set on rev 0 fs, " + "running e2fsck is recommended"); + /* + * Check feature flags regardless of the revision level, since we + * previously didn't change the revision level when setting the flags, + * so there is a chance incompat flags are set on a rev 0 filesystem. + */ + features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP); + if (features) { + ext3_msg(sb, KERN_ERR, + "error: couldn't mount because of unsupported " + "optional features (%x)", le32_to_cpu(features)); + goto failed_mount; + } + features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP); + if (!(sb->s_flags & MS_RDONLY) && features) { + ext3_msg(sb, KERN_ERR, + "error: couldn't mount RDWR because of unsupported " + "optional features (%x)", le32_to_cpu(features)); + goto failed_mount; + } + blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); + + if (blocksize < EXT3_MIN_BLOCK_SIZE || + blocksize > EXT3_MAX_BLOCK_SIZE) { + ext3_msg(sb, KERN_ERR, + "error: couldn't mount because of unsupported " + "filesystem blocksize %d", blocksize); + goto failed_mount; + } + + hblock = bdev_logical_block_size(sb->s_bdev); + if (sb->s_blocksize != blocksize) { + /* + * Make sure the blocksize for the filesystem is larger + * than the hardware sectorsize for the machine. + */ + if (blocksize < hblock) { + ext3_msg(sb, KERN_ERR, + "error: fsblocksize %d too small for " + "hardware sectorsize %d", blocksize, hblock); + goto failed_mount; + } + + brelse (bh); + if (!sb_set_blocksize(sb, blocksize)) { + ext3_msg(sb, KERN_ERR, + "error: bad blocksize %d", blocksize); + goto out_fail; + } + logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; + offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; + bh = sb_bread(sb, logic_sb_block); + if (!bh) { + ext3_msg(sb, KERN_ERR, + "error: can't read superblock on 2nd try"); + goto failed_mount; + } + es = (struct ext3_super_block *)(bh->b_data + offset); + sbi->s_es = es; + if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) { + ext3_msg(sb, KERN_ERR, + "error: magic mismatch"); + goto failed_mount; + } + } + + sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits); + + if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) { + sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE; + sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO; + } else { + sbi->s_inode_size = le16_to_cpu(es->s_inode_size); + sbi->s_first_ino = le32_to_cpu(es->s_first_ino); + if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) || + (!is_power_of_2(sbi->s_inode_size)) || + (sbi->s_inode_size > blocksize)) { + ext3_msg(sb, KERN_ERR, + "error: unsupported inode size: %d", + sbi->s_inode_size); + goto failed_mount; + } + } + sbi->s_frag_size = EXT3_MIN_FRAG_SIZE << + le32_to_cpu(es->s_log_frag_size); + if (blocksize != sbi->s_frag_size) { + ext3_msg(sb, KERN_ERR, + "error: fragsize %lu != blocksize %u (unsupported)", + sbi->s_frag_size, blocksize); + goto failed_mount; + } + sbi->s_frags_per_block = 1; + sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); + sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); + sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); + if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0) + goto cantfind_ext3; + sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb); + if (sbi->s_inodes_per_block == 0) + goto cantfind_ext3; + sbi->s_itb_per_group = sbi->s_inodes_per_group / + sbi->s_inodes_per_block; + sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc); + sbi->s_sbh = bh; + sbi->s_mount_state = le16_to_cpu(es->s_state); + sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb)); + sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb)); + for (i=0; i < 4; i++) + sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); + sbi->s_def_hash_version = es->s_def_hash_version; + i = le32_to_cpu(es->s_flags); + if (i & EXT2_FLAGS_UNSIGNED_HASH) + sbi->s_hash_unsigned = 3; + else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { +#ifdef __CHAR_UNSIGNED__ + es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); + sbi->s_hash_unsigned = 3; +#else + es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); +#endif + } + + if (sbi->s_blocks_per_group > blocksize * 8) { + ext3_msg(sb, KERN_ERR, + "#blocks per group too big: %lu", + sbi->s_blocks_per_group); + goto failed_mount; + } + if (sbi->s_frags_per_group > blocksize * 8) { + ext3_msg(sb, KERN_ERR, + "error: #fragments per group too big: %lu", + sbi->s_frags_per_group); + goto failed_mount; + } + if (sbi->s_inodes_per_group > blocksize * 8) { + ext3_msg(sb, KERN_ERR, + "error: #inodes per group too big: %lu", + sbi->s_inodes_per_group); + goto failed_mount; + } + + err = generic_check_addressable(sb->s_blocksize_bits, + le32_to_cpu(es->s_blocks_count)); + if (err) { + ext3_msg(sb, KERN_ERR, + "error: filesystem is too large to mount safely"); + if (sizeof(sector_t) < 8) + ext3_msg(sb, KERN_ERR, + "error: CONFIG_LBDAF not enabled"); + ret = err; + goto failed_mount; + } + + if (EXT3_BLOCKS_PER_GROUP(sb) == 0) + goto cantfind_ext3; + sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - + le32_to_cpu(es->s_first_data_block) - 1) + / EXT3_BLOCKS_PER_GROUP(sb)) + 1; + db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb)); + sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), + GFP_KERNEL); + if (sbi->s_group_desc == NULL) { + ext3_msg(sb, KERN_ERR, + "error: not enough memory"); + ret = -ENOMEM; + goto failed_mount; + } + + bgl_lock_init(sbi->s_blockgroup_lock); + + for (i = 0; i < db_count; i++) { + block = descriptor_loc(sb, logic_sb_block, i); + sbi->s_group_desc[i] = sb_bread(sb, block); + if (!sbi->s_group_desc[i]) { + ext3_msg(sb, KERN_ERR, + "error: can't read group descriptor %d", i); + db_count = i; + goto failed_mount2; + } + } + if (!ext3_check_descriptors (sb)) { + ext3_msg(sb, KERN_ERR, + "error: group descriptors corrupted"); + goto failed_mount2; + } + sbi->s_gdb_count = db_count; + get_random_bytes(&sbi->s_next_generation, sizeof(u32)); + spin_lock_init(&sbi->s_next_gen_lock); + + /* per fileystem reservation list head & lock */ + spin_lock_init(&sbi->s_rsv_window_lock); + sbi->s_rsv_window_root = RB_ROOT; + /* Add a single, static dummy reservation to the start of the + * reservation window list --- it gives us a placeholder for + * append-at-start-of-list which makes the allocation logic + * _much_ simpler. */ + sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; + sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; + sbi->s_rsv_window_head.rsv_alloc_hit = 0; + sbi->s_rsv_window_head.rsv_goal_size = 0; + ext3_rsv_window_add(sb, &sbi->s_rsv_window_head); + + /* + * set up enough so that it can read an inode + */ + sb->s_op = &ext3_sops; + sb->s_export_op = &ext3_export_ops; + sb->s_xattr = ext3_xattr_handlers; +#ifdef CONFIG_QUOTA + sb->s_qcop = &ext3_qctl_operations; + sb->dq_op = &ext3_quota_operations; + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; +#endif + memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); + INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ + mutex_init(&sbi->s_orphan_lock); + mutex_init(&sbi->s_resize_lock); + + sb->s_root = NULL; + + needs_recovery = (es->s_last_orphan != 0 || + EXT3_HAS_INCOMPAT_FEATURE(sb, + EXT3_FEATURE_INCOMPAT_RECOVER)); + + /* + * The first inode we look at is the journal inode. Don't try + * root first: it may be modified in the journal! + */ + if (!test_opt(sb, NOLOAD) && + EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { + if (ext3_load_journal(sb, es, journal_devnum)) + goto failed_mount2; + } else if (journal_inum) { + if (ext3_create_journal(sb, es, journal_inum)) + goto failed_mount2; + } else { + if (!silent) + ext3_msg(sb, KERN_ERR, + "error: no journal found. " + "mounting ext3 over ext2?"); + goto failed_mount2; + } + err = percpu_counter_init(&sbi->s_freeblocks_counter, + ext3_count_free_blocks(sb), GFP_KERNEL); + if (!err) { + err = percpu_counter_init(&sbi->s_freeinodes_counter, + ext3_count_free_inodes(sb), GFP_KERNEL); + } + if (!err) { + err = percpu_counter_init(&sbi->s_dirs_counter, + ext3_count_dirs(sb), GFP_KERNEL); + } + if (err) { + ext3_msg(sb, KERN_ERR, "error: insufficient memory"); + ret = err; + goto failed_mount3; + } + + /* We have now updated the journal if required, so we can + * validate the data journaling mode. */ + switch (test_opt(sb, DATA_FLAGS)) { + case 0: + /* No mode set, assume a default based on the journal + capabilities: ORDERED_DATA if the journal can + cope, else JOURNAL_DATA */ + if (journal_check_available_features + (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) + set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE); + else + set_opt(sbi->s_mount_opt, JOURNAL_DATA); + break; + + case EXT3_MOUNT_ORDERED_DATA: + case EXT3_MOUNT_WRITEBACK_DATA: + if (!journal_check_available_features + (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) { + ext3_msg(sb, KERN_ERR, + "error: journal does not support " + "requested data journaling mode"); + goto failed_mount3; + } + default: + break; + } + + /* + * The journal_load will have done any necessary log recovery, + * so we can safely mount the rest of the filesystem now. + */ + + root = ext3_iget(sb, EXT3_ROOT_INO); + if (IS_ERR(root)) { + ext3_msg(sb, KERN_ERR, "error: get root inode failed"); + ret = PTR_ERR(root); + goto failed_mount3; + } + if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { + iput(root); + ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); + goto failed_mount3; + } + sb->s_root = d_make_root(root); + if (!sb->s_root) { + ext3_msg(sb, KERN_ERR, "error: get root dentry failed"); + ret = -ENOMEM; + goto failed_mount3; + } + + if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY)) + sb->s_flags |= MS_RDONLY; + + EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS; + ext3_orphan_cleanup(sb, es); + EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS; + if (needs_recovery) { + ext3_mark_recovery_complete(sb, es); + ext3_msg(sb, KERN_INFO, "recovery complete"); + } + ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode", + test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal": + test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered": + "writeback"); + + return 0; + +cantfind_ext3: + if (!silent) + ext3_msg(sb, KERN_INFO, + "error: can't find ext3 filesystem on dev %s.", + sb->s_id); + goto failed_mount; + +failed_mount3: + percpu_counter_destroy(&sbi->s_freeblocks_counter); + percpu_counter_destroy(&sbi->s_freeinodes_counter); + percpu_counter_destroy(&sbi->s_dirs_counter); + journal_destroy(sbi->s_journal); +failed_mount2: + for (i = 0; i < db_count; i++) + brelse(sbi->s_group_desc[i]); + kfree(sbi->s_group_desc); +failed_mount: +#ifdef CONFIG_QUOTA + for (i = 0; i < EXT3_MAXQUOTAS; i++) + kfree(sbi->s_qf_names[i]); +#endif + ext3_blkdev_remove(sbi); + brelse(bh); +out_fail: + sb->s_fs_info = NULL; + kfree(sbi->s_blockgroup_lock); + kfree(sbi); + return ret; +} + +/* + * Setup any per-fs journal parameters now. We'll do this both on + * initial mount, once the journal has been initialised but before we've + * done any recovery; and again on any subsequent remount. + */ +static void ext3_init_journal_params(struct super_block *sb, journal_t *journal) +{ + struct ext3_sb_info *sbi = EXT3_SB(sb); + + if (sbi->s_commit_interval) + journal->j_commit_interval = sbi->s_commit_interval; + /* We could also set up an ext3-specific default for the commit + * interval here, but for now we'll just fall back to the jbd + * default. */ + + spin_lock(&journal->j_state_lock); + if (test_opt(sb, BARRIER)) + journal->j_flags |= JFS_BARRIER; + else + journal->j_flags &= ~JFS_BARRIER; + if (test_opt(sb, DATA_ERR_ABORT)) + journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR; + else + journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR; + spin_unlock(&journal->j_state_lock); +} + +static journal_t *ext3_get_journal(struct super_block *sb, + unsigned int journal_inum) +{ + struct inode *journal_inode; + journal_t *journal; + + /* First, test for the existence of a valid inode on disk. Bad + * things happen if we iget() an unused inode, as the subsequent + * iput() will try to delete it. */ + + journal_inode = ext3_iget(sb, journal_inum); + if (IS_ERR(journal_inode)) { + ext3_msg(sb, KERN_ERR, "error: no journal found"); + return NULL; + } + if (!journal_inode->i_nlink) { + make_bad_inode(journal_inode); + iput(journal_inode); + ext3_msg(sb, KERN_ERR, "error: journal inode is deleted"); + return NULL; + } + + jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", + journal_inode, journal_inode->i_size); + if (!S_ISREG(journal_inode->i_mode)) { + ext3_msg(sb, KERN_ERR, "error: invalid journal inode"); + iput(journal_inode); + return NULL; + } + + journal = journal_init_inode(journal_inode); + if (!journal) { + ext3_msg(sb, KERN_ERR, "error: could not load journal inode"); + iput(journal_inode); + return NULL; + } + journal->j_private = sb; + ext3_init_journal_params(sb, journal); + return journal; +} + +static journal_t *ext3_get_dev_journal(struct super_block *sb, + dev_t j_dev) +{ + struct buffer_head * bh; + journal_t *journal; + ext3_fsblk_t start; + ext3_fsblk_t len; + int hblock, blocksize; + ext3_fsblk_t sb_block; + unsigned long offset; + struct ext3_super_block * es; + struct block_device *bdev; + + bdev = ext3_blkdev_get(j_dev, sb); + if (bdev == NULL) + return NULL; + + blocksize = sb->s_blocksize; + hblock = bdev_logical_block_size(bdev); + if (blocksize < hblock) { + ext3_msg(sb, KERN_ERR, + "error: blocksize too small for journal device"); + goto out_bdev; + } + + sb_block = EXT3_MIN_BLOCK_SIZE / blocksize; + offset = EXT3_MIN_BLOCK_SIZE % blocksize; + set_blocksize(bdev, blocksize); + if (!(bh = __bread(bdev, sb_block, blocksize))) { + ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of " + "external journal"); + goto out_bdev; + } + + es = (struct ext3_super_block *) (bh->b_data + offset); + if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) || + !(le32_to_cpu(es->s_feature_incompat) & + EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { + ext3_msg(sb, KERN_ERR, "error: external journal has " + "bad superblock"); + brelse(bh); + goto out_bdev; + } + + if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { + ext3_msg(sb, KERN_ERR, "error: journal UUID does not match"); + brelse(bh); + goto out_bdev; + } + + len = le32_to_cpu(es->s_blocks_count); + start = sb_block + 1; + brelse(bh); /* we're done with the superblock */ + + journal = journal_init_dev(bdev, sb->s_bdev, + start, len, blocksize); + if (!journal) { + ext3_msg(sb, KERN_ERR, + "error: failed to create device journal"); + goto out_bdev; + } + journal->j_private = sb; + if (!bh_uptodate_or_lock(journal->j_sb_buffer)) { + if (bh_submit_read(journal->j_sb_buffer)) { + ext3_msg(sb, KERN_ERR, "I/O error on journal device"); + goto out_journal; + } + } + if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { + ext3_msg(sb, KERN_ERR, + "error: external journal has more than one " + "user (unsupported) - %d", + be32_to_cpu(journal->j_superblock->s_nr_users)); + goto out_journal; + } + EXT3_SB(sb)->journal_bdev = bdev; + ext3_init_journal_params(sb, journal); + return journal; +out_journal: + journal_destroy(journal); +out_bdev: + ext3_blkdev_put(bdev); + return NULL; +} + +static int ext3_load_journal(struct super_block *sb, + struct ext3_super_block *es, + unsigned long journal_devnum) +{ + journal_t *journal; + unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); + dev_t journal_dev; + int err = 0; + int really_read_only; + + if (journal_devnum && + journal_devnum != le32_to_cpu(es->s_journal_dev)) { + ext3_msg(sb, KERN_INFO, "external journal device major/minor " + "numbers have changed"); + journal_dev = new_decode_dev(journal_devnum); + } else + journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); + + really_read_only = bdev_read_only(sb->s_bdev); + + /* + * Are we loading a blank journal or performing recovery after a + * crash? For recovery, we need to check in advance whether we + * can get read-write access to the device. + */ + + if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) { + if (sb->s_flags & MS_RDONLY) { + ext3_msg(sb, KERN_INFO, + "recovery required on readonly filesystem"); + if (really_read_only) { + ext3_msg(sb, KERN_ERR, "error: write access " + "unavailable, cannot proceed"); + return -EROFS; + } + ext3_msg(sb, KERN_INFO, + "write access will be enabled during recovery"); + } + } + + if (journal_inum && journal_dev) { + ext3_msg(sb, KERN_ERR, "error: filesystem has both journal " + "and inode journals"); + return -EINVAL; + } + + if (journal_inum) { + if (!(journal = ext3_get_journal(sb, journal_inum))) + return -EINVAL; + } else { + if (!(journal = ext3_get_dev_journal(sb, journal_dev))) + return -EINVAL; + } + + if (!(journal->j_flags & JFS_BARRIER)) + printk(KERN_INFO "EXT3-fs: barriers not enabled\n"); + + if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { + err = journal_update_format(journal); + if (err) { + ext3_msg(sb, KERN_ERR, "error updating journal"); + journal_destroy(journal); + return err; + } + } + + if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) + err = journal_wipe(journal, !really_read_only); + if (!err) + err = journal_load(journal); + + if (err) { + ext3_msg(sb, KERN_ERR, "error loading journal"); + journal_destroy(journal); + return err; + } + + EXT3_SB(sb)->s_journal = journal; + ext3_clear_journal_err(sb, es); + + if (!really_read_only && journal_devnum && + journal_devnum != le32_to_cpu(es->s_journal_dev)) { + es->s_journal_dev = cpu_to_le32(journal_devnum); + + /* Make sure we flush the recovery flag to disk. */ + ext3_commit_super(sb, es, 1); + } + + return 0; +} + +static int ext3_create_journal(struct super_block *sb, + struct ext3_super_block *es, + unsigned int journal_inum) +{ + journal_t *journal; + int err; + + if (sb->s_flags & MS_RDONLY) { + ext3_msg(sb, KERN_ERR, + "error: readonly filesystem when trying to " + "create journal"); + return -EROFS; + } + + journal = ext3_get_journal(sb, journal_inum); + if (!journal) + return -EINVAL; + + ext3_msg(sb, KERN_INFO, "creating new journal on inode %u", + journal_inum); + + err = journal_create(journal); + if (err) { + ext3_msg(sb, KERN_ERR, "error creating journal"); + journal_destroy(journal); + return -EIO; + } + + EXT3_SB(sb)->s_journal = journal; + + ext3_update_dynamic_rev(sb); + EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); + EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL); + + es->s_journal_inum = cpu_to_le32(journal_inum); + + /* Make sure we flush the recovery flag to disk. */ + ext3_commit_super(sb, es, 1); + + return 0; +} + +static int ext3_commit_super(struct super_block *sb, + struct ext3_super_block *es, + int sync) +{ + struct buffer_head *sbh = EXT3_SB(sb)->s_sbh; + int error = 0; + + if (!sbh) + return error; + + if (buffer_write_io_error(sbh)) { + /* + * Oh, dear. A previous attempt to write the + * superblock failed. This could happen because the + * USB device was yanked out. Or it could happen to + * be a transient write error and maybe the block will + * be remapped. Nothing we can do but to retry the + * write and hope for the best. + */ + ext3_msg(sb, KERN_ERR, "previous I/O error to " + "superblock detected"); + clear_buffer_write_io_error(sbh); + set_buffer_uptodate(sbh); + } + /* + * If the file system is mounted read-only, don't update the + * superblock write time. This avoids updating the superblock + * write time when we are mounting the root file system + * read/only but we need to replay the journal; at that point, + * for people who are east of GMT and who make their clock + * tick in localtime for Windows bug-for-bug compatibility, + * the clock is set in the future, and this will cause e2fsck + * to complain and force a full file system check. + */ + if (!(sb->s_flags & MS_RDONLY)) + es->s_wtime = cpu_to_le32(get_seconds()); + es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb)); + es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb)); + BUFFER_TRACE(sbh, "marking dirty"); + mark_buffer_dirty(sbh); + if (sync) { + error = sync_dirty_buffer(sbh); + if (buffer_write_io_error(sbh)) { + ext3_msg(sb, KERN_ERR, "I/O error while writing " + "superblock"); + clear_buffer_write_io_error(sbh); + set_buffer_uptodate(sbh); + } + } + return error; +} + + +/* + * Have we just finished recovery? If so, and if we are mounting (or + * remounting) the filesystem readonly, then we will end up with a + * consistent fs on disk. Record that fact. + */ +static void ext3_mark_recovery_complete(struct super_block * sb, + struct ext3_super_block * es) +{ + journal_t *journal = EXT3_SB(sb)->s_journal; + + journal_lock_updates(journal); + if (journal_flush(journal) < 0) + goto out; + + if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) && + sb->s_flags & MS_RDONLY) { + EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); + ext3_commit_super(sb, es, 1); + } + +out: + journal_unlock_updates(journal); +} + +/* + * If we are mounting (or read-write remounting) a filesystem whose journal + * has recorded an error from a previous lifetime, move that error to the + * main filesystem now. + */ +static void ext3_clear_journal_err(struct super_block *sb, + struct ext3_super_block *es) +{ + journal_t *journal; + int j_errno; + const char *errstr; + + journal = EXT3_SB(sb)->s_journal; + + /* + * Now check for any error status which may have been recorded in the + * journal by a prior ext3_error() or ext3_abort() + */ + + j_errno = journal_errno(journal); + if (j_errno) { + char nbuf[16]; + + errstr = ext3_decode_error(sb, j_errno, nbuf); + ext3_warning(sb, __func__, "Filesystem error recorded " + "from previous mount: %s", errstr); + ext3_warning(sb, __func__, "Marking fs in need of " + "filesystem check."); + + EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; + es->s_state |= cpu_to_le16(EXT3_ERROR_FS); + ext3_commit_super (sb, es, 1); + + journal_clear_err(journal); + } +} + +/* + * Force the running and committing transactions to commit, + * and wait on the commit. + */ +int ext3_force_commit(struct super_block *sb) +{ + journal_t *journal; + int ret; + + if (sb->s_flags & MS_RDONLY) + return 0; + + journal = EXT3_SB(sb)->s_journal; + ret = ext3_journal_force_commit(journal); + return ret; +} + +static int ext3_sync_fs(struct super_block *sb, int wait) +{ + tid_t target; + + trace_ext3_sync_fs(sb, wait); + /* + * Writeback quota in non-journalled quota case - journalled quota has + * no dirty dquots + */ + dquot_writeback_dquots(sb, -1); + if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) { + if (wait) + log_wait_commit(EXT3_SB(sb)->s_journal, target); + } + return 0; +} + +/* + * LVM calls this function before a (read-only) snapshot is created. This + * gives us a chance to flush the journal completely and mark the fs clean. + */ +static int ext3_freeze(struct super_block *sb) +{ + int error = 0; + journal_t *journal; + + if (!(sb->s_flags & MS_RDONLY)) { + journal = EXT3_SB(sb)->s_journal; + + /* Now we set up the journal barrier. */ + journal_lock_updates(journal); + + /* + * We don't want to clear needs_recovery flag when we failed + * to flush the journal. + */ + error = journal_flush(journal); + if (error < 0) + goto out; + + /* Journal blocked and flushed, clear needs_recovery flag. */ + EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); + error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); + if (error) + goto out; + } + return 0; + +out: + journal_unlock_updates(journal); + return error; +} + +/* + * Called by LVM after the snapshot is done. We need to reset the RECOVER + * flag here, even though the filesystem is not technically dirty yet. + */ +static int ext3_unfreeze(struct super_block *sb) +{ + if (!(sb->s_flags & MS_RDONLY)) { + /* Reser the needs_recovery flag before the fs is unlocked. */ + EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); + ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); + journal_unlock_updates(EXT3_SB(sb)->s_journal); + } + return 0; +} + +static int ext3_remount (struct super_block * sb, int * flags, char * data) +{ + struct ext3_super_block * es; + struct ext3_sb_info *sbi = EXT3_SB(sb); + ext3_fsblk_t n_blocks_count = 0; + unsigned long old_sb_flags; + struct ext3_mount_options old_opts; + int enable_quota = 0; + int err; +#ifdef CONFIG_QUOTA + int i; +#endif + + sync_filesystem(sb); + + /* Store the original options */ + old_sb_flags = sb->s_flags; + old_opts.s_mount_opt = sbi->s_mount_opt; + old_opts.s_resuid = sbi->s_resuid; + old_opts.s_resgid = sbi->s_resgid; + old_opts.s_commit_interval = sbi->s_commit_interval; +#ifdef CONFIG_QUOTA + old_opts.s_jquota_fmt = sbi->s_jquota_fmt; + for (i = 0; i < EXT3_MAXQUOTAS; i++) + if (sbi->s_qf_names[i]) { + old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i], + GFP_KERNEL); + if (!old_opts.s_qf_names[i]) { + int j; + + for (j = 0; j < i; j++) + kfree(old_opts.s_qf_names[j]); + return -ENOMEM; + } + } else + old_opts.s_qf_names[i] = NULL; +#endif + + /* + * Allow the "check" option to be passed as a remount option. + */ + if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { + err = -EINVAL; + goto restore_opts; + } + + if (test_opt(sb, ABORT)) + ext3_abort(sb, __func__, "Abort forced by user"); + + sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | + (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); + + es = sbi->s_es; + + ext3_init_journal_params(sb, sbi->s_journal); + + if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || + n_blocks_count > le32_to_cpu(es->s_blocks_count)) { + if (test_opt(sb, ABORT)) { + err = -EROFS; + goto restore_opts; + } + + if (*flags & MS_RDONLY) { + err = dquot_suspend(sb, -1); + if (err < 0) + goto restore_opts; + + /* + * First of all, the unconditional stuff we have to do + * to disable replay of the journal when we next remount + */ + sb->s_flags |= MS_RDONLY; + + /* + * OK, test if we are remounting a valid rw partition + * readonly, and if so set the rdonly flag and then + * mark the partition as valid again. + */ + if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) && + (sbi->s_mount_state & EXT3_VALID_FS)) + es->s_state = cpu_to_le16(sbi->s_mount_state); + + ext3_mark_recovery_complete(sb, es); + } else { + __le32 ret; + if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb, + ~EXT3_FEATURE_RO_COMPAT_SUPP))) { + ext3_msg(sb, KERN_WARNING, + "warning: couldn't remount RDWR " + "because of unsupported optional " + "features (%x)", le32_to_cpu(ret)); + err = -EROFS; + goto restore_opts; + } + + /* + * If we have an unprocessed orphan list hanging + * around from a previously readonly bdev mount, + * require a full umount & mount for now. + */ + if (es->s_last_orphan) { + ext3_msg(sb, KERN_WARNING, "warning: couldn't " + "remount RDWR because of unprocessed " + "orphan inode list. Please " + "umount & mount instead."); + err = -EINVAL; + goto restore_opts; + } + + /* + * Mounting a RDONLY partition read-write, so reread + * and store the current valid flag. (It may have + * been changed by e2fsck since we originally mounted + * the partition.) + */ + ext3_clear_journal_err(sb, es); + sbi->s_mount_state = le16_to_cpu(es->s_state); + if ((err = ext3_group_extend(sb, es, n_blocks_count))) + goto restore_opts; + if (!ext3_setup_super (sb, es, 0)) + sb->s_flags &= ~MS_RDONLY; + enable_quota = 1; + } + } +#ifdef CONFIG_QUOTA + /* Release old quota file names */ + for (i = 0; i < EXT3_MAXQUOTAS; i++) + kfree(old_opts.s_qf_names[i]); +#endif + if (enable_quota) + dquot_resume(sb, -1); + return 0; +restore_opts: + sb->s_flags = old_sb_flags; + sbi->s_mount_opt = old_opts.s_mount_opt; + sbi->s_resuid = old_opts.s_resuid; + sbi->s_resgid = old_opts.s_resgid; + sbi->s_commit_interval = old_opts.s_commit_interval; +#ifdef CONFIG_QUOTA + sbi->s_jquota_fmt = old_opts.s_jquota_fmt; + for (i = 0; i < EXT3_MAXQUOTAS; i++) { + kfree(sbi->s_qf_names[i]); + sbi->s_qf_names[i] = old_opts.s_qf_names[i]; + } +#endif + return err; +} + +static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf) +{ + struct super_block *sb = dentry->d_sb; + struct ext3_sb_info *sbi = EXT3_SB(sb); + struct ext3_super_block *es = sbi->s_es; + u64 fsid; + + if (test_opt(sb, MINIX_DF)) { + sbi->s_overhead_last = 0; + } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { + unsigned long ngroups = sbi->s_groups_count, i; + ext3_fsblk_t overhead = 0; + smp_rmb(); + + /* + * Compute the overhead (FS structures). This is constant + * for a given filesystem unless the number of block groups + * changes so we cache the previous value until it does. + */ + + /* + * All of the blocks before first_data_block are + * overhead + */ + overhead = le32_to_cpu(es->s_first_data_block); + + /* + * Add the overhead attributed to the superblock and + * block group descriptors. If the sparse superblocks + * feature is turned on, then not all groups have this. + */ + for (i = 0; i < ngroups; i++) { + overhead += ext3_bg_has_super(sb, i) + + ext3_bg_num_gdb(sb, i); + cond_resched(); + } + + /* + * Every block group has an inode bitmap, a block + * bitmap, and an inode table. + */ + overhead += ngroups * (2 + sbi->s_itb_per_group); + + /* Add the internal journal blocks as well */ + if (sbi->s_journal && !sbi->journal_bdev) + overhead += sbi->s_journal->j_maxlen; + + sbi->s_overhead_last = overhead; + smp_wmb(); + sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); + } + + buf->f_type = EXT3_SUPER_MAGIC; + buf->f_bsize = sb->s_blocksize; + buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; + buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); + buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); + if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) + buf->f_bavail = 0; + buf->f_files = le32_to_cpu(es->s_inodes_count); + buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); + buf->f_namelen = EXT3_NAME_LEN; + fsid = le64_to_cpup((void *)es->s_uuid) ^ + le64_to_cpup((void *)es->s_uuid + sizeof(u64)); + buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; + buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; + return 0; +} + +/* Helper function for writing quotas on sync - we need to start transaction before quota file + * is locked for write. Otherwise the are possible deadlocks: + * Process 1 Process 2 + * ext3_create() quota_sync() + * journal_start() write_dquot() + * dquot_initialize() down(dqio_mutex) + * down(dqio_mutex) journal_start() + * + */ + +#ifdef CONFIG_QUOTA + +static inline struct inode *dquot_to_inode(struct dquot *dquot) +{ + return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; +} + +static int ext3_write_dquot(struct dquot *dquot) +{ + int ret, err; + handle_t *handle; + struct inode *inode; + + inode = dquot_to_inode(dquot); + handle = ext3_journal_start(inode, + EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + ret = dquot_commit(dquot); + err = ext3_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +static int ext3_acquire_dquot(struct dquot *dquot) +{ + int ret, err; + handle_t *handle; + + handle = ext3_journal_start(dquot_to_inode(dquot), + EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + ret = dquot_acquire(dquot); + err = ext3_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +static int ext3_release_dquot(struct dquot *dquot) +{ + int ret, err; + handle_t *handle; + + handle = ext3_journal_start(dquot_to_inode(dquot), + EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb)); + if (IS_ERR(handle)) { + /* Release dquot anyway to avoid endless cycle in dqput() */ + dquot_release(dquot); + return PTR_ERR(handle); + } + ret = dquot_release(dquot); + err = ext3_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +static int ext3_mark_dquot_dirty(struct dquot *dquot) +{ + /* Are we journaling quotas? */ + if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || + EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { + dquot_mark_dquot_dirty(dquot); + return ext3_write_dquot(dquot); + } else { + return dquot_mark_dquot_dirty(dquot); + } +} + +static int ext3_write_info(struct super_block *sb, int type) +{ + int ret, err; + handle_t *handle; + + /* Data block + inode block */ + handle = ext3_journal_start(d_inode(sb->s_root), 2); + if (IS_ERR(handle)) + return PTR_ERR(handle); + ret = dquot_commit_info(sb, type); + err = ext3_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +/* + * Turn on quotas during mount time - we need to find + * the quota file and such... + */ +static int ext3_quota_on_mount(struct super_block *sb, int type) +{ + return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type], + EXT3_SB(sb)->s_jquota_fmt, type); +} + +/* + * Standard function to be called on quota_on + */ +static int ext3_quota_on(struct super_block *sb, int type, int format_id, + struct path *path) +{ + int err; + + if (!test_opt(sb, QUOTA)) + return -EINVAL; + + /* Quotafile not on the same filesystem? */ + if (path->dentry->d_sb != sb) + return -EXDEV; + /* Journaling quota? */ + if (EXT3_SB(sb)->s_qf_names[type]) { + /* Quotafile not of fs root? */ + if (path->dentry->d_parent != sb->s_root) + ext3_msg(sb, KERN_WARNING, + "warning: Quota file not on filesystem root. " + "Journaled quota will not work."); + } + + /* + * When we journal data on quota file, we have to flush journal to see + * all updates to the file when we bypass pagecache... + */ + if (ext3_should_journal_data(d_inode(path->dentry))) { + /* + * We don't need to lock updates but journal_flush() could + * otherwise be livelocked... + */ + journal_lock_updates(EXT3_SB(sb)->s_journal); + err = journal_flush(EXT3_SB(sb)->s_journal); + journal_unlock_updates(EXT3_SB(sb)->s_journal); + if (err) + return err; + } + + return dquot_quota_on(sb, type, format_id, path); +} + +/* Read data from quotafile - avoid pagecache and such because we cannot afford + * acquiring the locks... As quota files are never truncated and quota code + * itself serializes the operations (and no one else should touch the files) + * we don't have to be afraid of races */ +static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); + int err = 0; + int offset = off & (sb->s_blocksize - 1); + int tocopy; + size_t toread; + struct buffer_head *bh; + loff_t i_size = i_size_read(inode); + + if (off > i_size) + return 0; + if (off+len > i_size) + len = i_size-off; + toread = len; + while (toread > 0) { + tocopy = sb->s_blocksize - offset < toread ? + sb->s_blocksize - offset : toread; + bh = ext3_bread(NULL, inode, blk, 0, &err); + if (err) + return err; + if (!bh) /* A hole? */ + memset(data, 0, tocopy); + else + memcpy(data, bh->b_data+offset, tocopy); + brelse(bh); + offset = 0; + toread -= tocopy; + data += tocopy; + blk++; + } + return len; +} + +/* Write to quotafile (we know the transaction is already started and has + * enough credits) */ +static ssize_t ext3_quota_write(struct super_block *sb, int type, + const char *data, size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); + int err = 0; + int offset = off & (sb->s_blocksize - 1); + int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL; + struct buffer_head *bh; + handle_t *handle = journal_current_handle(); + + if (!handle) { + ext3_msg(sb, KERN_WARNING, + "warning: quota write (off=%llu, len=%llu)" + " cancelled because transaction is not started.", + (unsigned long long)off, (unsigned long long)len); + return -EIO; + } + + /* + * Since we account only one data block in transaction credits, + * then it is impossible to cross a block boundary. + */ + if (sb->s_blocksize - offset < len) { + ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" + " cancelled because not block aligned", + (unsigned long long)off, (unsigned long long)len); + return -EIO; + } + bh = ext3_bread(handle, inode, blk, 1, &err); + if (!bh) + goto out; + if (journal_quota) { + err = ext3_journal_get_write_access(handle, bh); + if (err) { + brelse(bh); + goto out; + } + } + lock_buffer(bh); + memcpy(bh->b_data+offset, data, len); + flush_dcache_page(bh->b_page); + unlock_buffer(bh); + if (journal_quota) + err = ext3_journal_dirty_metadata(handle, bh); + else { + /* Always do at least ordered writes for quotas */ + err = ext3_journal_dirty_data(handle, bh); + mark_buffer_dirty(bh); + } + brelse(bh); +out: + if (err) + return err; + if (inode->i_size < off + len) { + i_size_write(inode, off + len); + EXT3_I(inode)->i_disksize = inode->i_size; + } + inode->i_version++; + inode->i_mtime = inode->i_ctime = CURRENT_TIME; + ext3_mark_inode_dirty(handle, inode); + return len; +} + +#endif + +static struct dentry *ext3_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super); +} + +static struct file_system_type ext3_fs_type = { + .owner = THIS_MODULE, + .name = "ext3", + .mount = ext3_mount, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("ext3"); + +static int __init init_ext3_fs(void) +{ + int err = init_ext3_xattr(); + if (err) + return err; + err = init_inodecache(); + if (err) + goto out1; + err = register_filesystem(&ext3_fs_type); + if (err) + goto out; + return 0; +out: + destroy_inodecache(); +out1: + exit_ext3_xattr(); + return err; +} + +static void __exit exit_ext3_fs(void) +{ + unregister_filesystem(&ext3_fs_type); + destroy_inodecache(); + exit_ext3_xattr(); +} + +MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); +MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions"); +MODULE_LICENSE("GPL"); +module_init(init_ext3_fs) +module_exit(exit_ext3_fs) diff --git a/kernel/fs/ext3/symlink.c b/kernel/fs/ext3/symlink.c new file mode 100644 index 000000000..ea96df3c5 --- /dev/null +++ b/kernel/fs/ext3/symlink.c @@ -0,0 +1,54 @@ +/* + * linux/fs/ext3/symlink.c + * + * Only fast symlinks left here - the rest is done by generic code. AV, 1999 + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/symlink.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * ext3 symlink handling code + */ + +#include +#include "ext3.h" +#include "xattr.h" + +static void * ext3_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + struct ext3_inode_info *ei = EXT3_I(d_inode(dentry)); + nd_set_link(nd, (char*)ei->i_data); + return NULL; +} + +const struct inode_operations ext3_symlink_inode_operations = { + .readlink = generic_readlink, + .follow_link = page_follow_link_light, + .put_link = page_put_link, + .setattr = ext3_setattr, +#ifdef CONFIG_EXT3_FS_XATTR + .setxattr = generic_setxattr, + .getxattr = generic_getxattr, + .listxattr = ext3_listxattr, + .removexattr = generic_removexattr, +#endif +}; + +const struct inode_operations ext3_fast_symlink_inode_operations = { + .readlink = generic_readlink, + .follow_link = ext3_follow_link, + .setattr = ext3_setattr, +#ifdef CONFIG_EXT3_FS_XATTR + .setxattr = generic_setxattr, + .getxattr = generic_getxattr, + .listxattr = ext3_listxattr, + .removexattr = generic_removexattr, +#endif +}; diff --git a/kernel/fs/ext3/xattr.c b/kernel/fs/ext3/xattr.c new file mode 100644 index 000000000..7cf36501c --- /dev/null +++ b/kernel/fs/ext3/xattr.c @@ -0,0 +1,1330 @@ +/* + * linux/fs/ext3/xattr.c + * + * Copyright (C) 2001-2003 Andreas Gruenbacher, + * + * Fix by Harrison Xing . + * Ext3 code with a lot of help from Eric Jarman . + * Extended attributes for symlinks and special files added per + * suggestion of Luka Renko . + * xattr consolidation Copyright (c) 2004 James Morris , + * Red Hat Inc. + * ea-in-inode support by Alex Tomas aka bzzz + * and Andreas Gruenbacher . + */ + +/* + * Extended attributes are stored directly in inodes (on file systems with + * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl + * field contains the block number if an inode uses an additional block. All + * attributes must fit in the inode and one additional block. Blocks that + * contain the identical set of attributes may be shared among several inodes. + * Identical blocks are detected by keeping a cache of blocks that have + * recently been accessed. + * + * The attributes in inodes and on blocks have a different header; the entries + * are stored in the same format: + * + * +------------------+ + * | header | + * | entry 1 | | + * | entry 2 | | growing downwards + * | entry 3 | v + * | four null bytes | + * | . . . | + * | value 1 | ^ + * | value 3 | | growing upwards + * | value 2 | | + * +------------------+ + * + * The header is followed by multiple entry descriptors. In disk blocks, the + * entry descriptors are kept sorted. In inodes, they are unsorted. The + * attribute values are aligned to the end of the block in no specific order. + * + * Locking strategy + * ---------------- + * EXT3_I(inode)->i_file_acl is protected by EXT3_I(inode)->xattr_sem. + * EA blocks are only changed if they are exclusive to an inode, so + * holding xattr_sem also means that nothing but the EA block's reference + * count can change. Multiple writers to the same block are synchronized + * by the buffer lock. + */ + +#include "ext3.h" +#include +#include +#include "xattr.h" +#include "acl.h" + +#define BHDR(bh) ((struct ext3_xattr_header *)((bh)->b_data)) +#define ENTRY(ptr) ((struct ext3_xattr_entry *)(ptr)) +#define BFIRST(bh) ENTRY(BHDR(bh)+1) +#define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) + +#define IHDR(inode, raw_inode) \ + ((struct ext3_xattr_ibody_header *) \ + ((void *)raw_inode + \ + EXT3_GOOD_OLD_INODE_SIZE + \ + EXT3_I(inode)->i_extra_isize)) +#define IFIRST(hdr) ((struct ext3_xattr_entry *)((hdr)+1)) + +#ifdef EXT3_XATTR_DEBUG +# define ea_idebug(inode, f...) do { \ + printk(KERN_DEBUG "inode %s:%lu: ", \ + inode->i_sb->s_id, inode->i_ino); \ + printk(f); \ + printk("\n"); \ + } while (0) +# define ea_bdebug(bh, f...) do { \ + char b[BDEVNAME_SIZE]; \ + printk(KERN_DEBUG "block %s:%lu: ", \ + bdevname(bh->b_bdev, b), \ + (unsigned long) bh->b_blocknr); \ + printk(f); \ + printk("\n"); \ + } while (0) +#else +# define ea_idebug(f...) +# define ea_bdebug(f...) +#endif + +static void ext3_xattr_cache_insert(struct buffer_head *); +static struct buffer_head *ext3_xattr_cache_find(struct inode *, + struct ext3_xattr_header *, + struct mb_cache_entry **); +static void ext3_xattr_rehash(struct ext3_xattr_header *, + struct ext3_xattr_entry *); +static int ext3_xattr_list(struct dentry *dentry, char *buffer, + size_t buffer_size); + +static struct mb_cache *ext3_xattr_cache; + +static const struct xattr_handler *ext3_xattr_handler_map[] = { + [EXT3_XATTR_INDEX_USER] = &ext3_xattr_user_handler, +#ifdef CONFIG_EXT3_FS_POSIX_ACL + [EXT3_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, + [EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, +#endif + [EXT3_XATTR_INDEX_TRUSTED] = &ext3_xattr_trusted_handler, +#ifdef CONFIG_EXT3_FS_SECURITY + [EXT3_XATTR_INDEX_SECURITY] = &ext3_xattr_security_handler, +#endif +}; + +const struct xattr_handler *ext3_xattr_handlers[] = { + &ext3_xattr_user_handler, + &ext3_xattr_trusted_handler, +#ifdef CONFIG_EXT3_FS_POSIX_ACL + &posix_acl_access_xattr_handler, + &posix_acl_default_xattr_handler, +#endif +#ifdef CONFIG_EXT3_FS_SECURITY + &ext3_xattr_security_handler, +#endif + NULL +}; + +static inline const struct xattr_handler * +ext3_xattr_handler(int name_index) +{ + const struct xattr_handler *handler = NULL; + + if (name_index > 0 && name_index < ARRAY_SIZE(ext3_xattr_handler_map)) + handler = ext3_xattr_handler_map[name_index]; + return handler; +} + +/* + * Inode operation listxattr() + * + * d_inode(dentry)->i_mutex: don't care + */ +ssize_t +ext3_listxattr(struct dentry *dentry, char *buffer, size_t size) +{ + return ext3_xattr_list(dentry, buffer, size); +} + +static int +ext3_xattr_check_names(struct ext3_xattr_entry *entry, void *end) +{ + while (!IS_LAST_ENTRY(entry)) { + struct ext3_xattr_entry *next = EXT3_XATTR_NEXT(entry); + if ((void *)next >= end) + return -EIO; + entry = next; + } + return 0; +} + +static inline int +ext3_xattr_check_block(struct buffer_head *bh) +{ + int error; + + if (BHDR(bh)->h_magic != cpu_to_le32(EXT3_XATTR_MAGIC) || + BHDR(bh)->h_blocks != cpu_to_le32(1)) + return -EIO; + error = ext3_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size); + return error; +} + +static inline int +ext3_xattr_check_entry(struct ext3_xattr_entry *entry, size_t size) +{ + size_t value_size = le32_to_cpu(entry->e_value_size); + + if (entry->e_value_block != 0 || value_size > size || + le16_to_cpu(entry->e_value_offs) + value_size > size) + return -EIO; + return 0; +} + +static int +ext3_xattr_find_entry(struct ext3_xattr_entry **pentry, int name_index, + const char *name, size_t size, int sorted) +{ + struct ext3_xattr_entry *entry; + size_t name_len; + int cmp = 1; + + if (name == NULL) + return -EINVAL; + name_len = strlen(name); + entry = *pentry; + for (; !IS_LAST_ENTRY(entry); entry = EXT3_XATTR_NEXT(entry)) { + cmp = name_index - entry->e_name_index; + if (!cmp) + cmp = name_len - entry->e_name_len; + if (!cmp) + cmp = memcmp(name, entry->e_name, name_len); + if (cmp <= 0 && (sorted || cmp == 0)) + break; + } + *pentry = entry; + if (!cmp && ext3_xattr_check_entry(entry, size)) + return -EIO; + return cmp ? -ENODATA : 0; +} + +static int +ext3_xattr_block_get(struct inode *inode, int name_index, const char *name, + void *buffer, size_t buffer_size) +{ + struct buffer_head *bh = NULL; + struct ext3_xattr_entry *entry; + size_t size; + int error; + + ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", + name_index, name, buffer, (long)buffer_size); + + error = -ENODATA; + if (!EXT3_I(inode)->i_file_acl) + goto cleanup; + ea_idebug(inode, "reading block %u", EXT3_I(inode)->i_file_acl); + bh = sb_bread(inode->i_sb, EXT3_I(inode)->i_file_acl); + if (!bh) + goto cleanup; + ea_bdebug(bh, "b_count=%d, refcount=%d", + atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); + if (ext3_xattr_check_block(bh)) { +bad_block: ext3_error(inode->i_sb, __func__, + "inode %lu: bad block "E3FSBLK, inode->i_ino, + EXT3_I(inode)->i_file_acl); + error = -EIO; + goto cleanup; + } + ext3_xattr_cache_insert(bh); + entry = BFIRST(bh); + error = ext3_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); + if (error == -EIO) + goto bad_block; + if (error) + goto cleanup; + size = le32_to_cpu(entry->e_value_size); + if (buffer) { + error = -ERANGE; + if (size > buffer_size) + goto cleanup; + memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), + size); + } + error = size; + +cleanup: + brelse(bh); + return error; +} + +static int +ext3_xattr_ibody_get(struct inode *inode, int name_index, const char *name, + void *buffer, size_t buffer_size) +{ + struct ext3_xattr_ibody_header *header; + struct ext3_xattr_entry *entry; + struct ext3_inode *raw_inode; + struct ext3_iloc iloc; + size_t size; + void *end; + int error; + + if (!ext3_test_inode_state(inode, EXT3_STATE_XATTR)) + return -ENODATA; + error = ext3_get_inode_loc(inode, &iloc); + if (error) + return error; + raw_inode = ext3_raw_inode(&iloc); + header = IHDR(inode, raw_inode); + entry = IFIRST(header); + end = (void *)raw_inode + EXT3_SB(inode->i_sb)->s_inode_size; + error = ext3_xattr_check_names(entry, end); + if (error) + goto cleanup; + error = ext3_xattr_find_entry(&entry, name_index, name, + end - (void *)entry, 0); + if (error) + goto cleanup; + size = le32_to_cpu(entry->e_value_size); + if (buffer) { + error = -ERANGE; + if (size > buffer_size) + goto cleanup; + memcpy(buffer, (void *)IFIRST(header) + + le16_to_cpu(entry->e_value_offs), size); + } + error = size; + +cleanup: + brelse(iloc.bh); + return error; +} + +/* + * ext3_xattr_get() + * + * Copy an extended attribute into the buffer + * provided, or compute the buffer size required. + * Buffer is NULL to compute the size of the buffer required. + * + * Returns a negative error number on failure, or the number of bytes + * used / required on success. + */ +int +ext3_xattr_get(struct inode *inode, int name_index, const char *name, + void *buffer, size_t buffer_size) +{ + int error; + + down_read(&EXT3_I(inode)->xattr_sem); + error = ext3_xattr_ibody_get(inode, name_index, name, buffer, + buffer_size); + if (error == -ENODATA) + error = ext3_xattr_block_get(inode, name_index, name, buffer, + buffer_size); + up_read(&EXT3_I(inode)->xattr_sem); + return error; +} + +static int +ext3_xattr_list_entries(struct dentry *dentry, struct ext3_xattr_entry *entry, + char *buffer, size_t buffer_size) +{ + size_t rest = buffer_size; + + for (; !IS_LAST_ENTRY(entry); entry = EXT3_XATTR_NEXT(entry)) { + const struct xattr_handler *handler = + ext3_xattr_handler(entry->e_name_index); + + if (handler) { + size_t size = handler->list(dentry, buffer, rest, + entry->e_name, + entry->e_name_len, + handler->flags); + if (buffer) { + if (size > rest) + return -ERANGE; + buffer += size; + } + rest -= size; + } + } + return buffer_size - rest; +} + +static int +ext3_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) +{ + struct inode *inode = d_inode(dentry); + struct buffer_head *bh = NULL; + int error; + + ea_idebug(inode, "buffer=%p, buffer_size=%ld", + buffer, (long)buffer_size); + + error = 0; + if (!EXT3_I(inode)->i_file_acl) + goto cleanup; + ea_idebug(inode, "reading block %u", EXT3_I(inode)->i_file_acl); + bh = sb_bread(inode->i_sb, EXT3_I(inode)->i_file_acl); + error = -EIO; + if (!bh) + goto cleanup; + ea_bdebug(bh, "b_count=%d, refcount=%d", + atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); + if (ext3_xattr_check_block(bh)) { + ext3_error(inode->i_sb, __func__, + "inode %lu: bad block "E3FSBLK, inode->i_ino, + EXT3_I(inode)->i_file_acl); + error = -EIO; + goto cleanup; + } + ext3_xattr_cache_insert(bh); + error = ext3_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); + +cleanup: + brelse(bh); + + return error; +} + +static int +ext3_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) +{ + struct inode *inode = d_inode(dentry); + struct ext3_xattr_ibody_header *header; + struct ext3_inode *raw_inode; + struct ext3_iloc iloc; + void *end; + int error; + + if (!ext3_test_inode_state(inode, EXT3_STATE_XATTR)) + return 0; + error = ext3_get_inode_loc(inode, &iloc); + if (error) + return error; + raw_inode = ext3_raw_inode(&iloc); + header = IHDR(inode, raw_inode); + end = (void *)raw_inode + EXT3_SB(inode->i_sb)->s_inode_size; + error = ext3_xattr_check_names(IFIRST(header), end); + if (error) + goto cleanup; + error = ext3_xattr_list_entries(dentry, IFIRST(header), + buffer, buffer_size); + +cleanup: + brelse(iloc.bh); + return error; +} + +/* + * ext3_xattr_list() + * + * Copy a list of attribute names into the buffer + * provided, or compute the buffer size required. + * Buffer is NULL to compute the size of the buffer required. + * + * Returns a negative error number on failure, or the number of bytes + * used / required on success. + */ +static int +ext3_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) +{ + int i_error, b_error; + + down_read(&EXT3_I(d_inode(dentry))->xattr_sem); + i_error = ext3_xattr_ibody_list(dentry, buffer, buffer_size); + if (i_error < 0) { + b_error = 0; + } else { + if (buffer) { + buffer += i_error; + buffer_size -= i_error; + } + b_error = ext3_xattr_block_list(dentry, buffer, buffer_size); + if (b_error < 0) + i_error = 0; + } + up_read(&EXT3_I(d_inode(dentry))->xattr_sem); + return i_error + b_error; +} + +/* + * If the EXT3_FEATURE_COMPAT_EXT_ATTR feature of this file system is + * not set, set it. + */ +static void ext3_xattr_update_super_block(handle_t *handle, + struct super_block *sb) +{ + if (EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_EXT_ATTR)) + return; + + if (ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh) == 0) { + EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_EXT_ATTR); + ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh); + } +} + +/* + * Release the xattr block BH: If the reference count is > 1, decrement + * it; otherwise free the block. + */ +static void +ext3_xattr_release_block(handle_t *handle, struct inode *inode, + struct buffer_head *bh) +{ + struct mb_cache_entry *ce = NULL; + int error = 0; + + ce = mb_cache_entry_get(ext3_xattr_cache, bh->b_bdev, bh->b_blocknr); + error = ext3_journal_get_write_access(handle, bh); + if (error) + goto out; + + lock_buffer(bh); + + if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { + ea_bdebug(bh, "refcount now=0; freeing"); + if (ce) + mb_cache_entry_free(ce); + ext3_free_blocks(handle, inode, bh->b_blocknr, 1); + get_bh(bh); + ext3_forget(handle, 1, inode, bh, bh->b_blocknr); + } else { + le32_add_cpu(&BHDR(bh)->h_refcount, -1); + error = ext3_journal_dirty_metadata(handle, bh); + if (IS_SYNC(inode)) + handle->h_sync = 1; + dquot_free_block(inode, 1); + ea_bdebug(bh, "refcount now=%d; releasing", + le32_to_cpu(BHDR(bh)->h_refcount)); + if (ce) + mb_cache_entry_release(ce); + } + unlock_buffer(bh); +out: + ext3_std_error(inode->i_sb, error); + return; +} + +struct ext3_xattr_info { + int name_index; + const char *name; + const void *value; + size_t value_len; +}; + +struct ext3_xattr_search { + struct ext3_xattr_entry *first; + void *base; + void *end; + struct ext3_xattr_entry *here; + int not_found; +}; + +static int +ext3_xattr_set_entry(struct ext3_xattr_info *i, struct ext3_xattr_search *s) +{ + struct ext3_xattr_entry *last; + size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); + + /* Compute min_offs and last. */ + last = s->first; + for (; !IS_LAST_ENTRY(last); last = EXT3_XATTR_NEXT(last)) { + if (!last->e_value_block && last->e_value_size) { + size_t offs = le16_to_cpu(last->e_value_offs); + if (offs < min_offs) + min_offs = offs; + } + } + free = min_offs - ((void *)last - s->base) - sizeof(__u32); + if (!s->not_found) { + if (!s->here->e_value_block && s->here->e_value_size) { + size_t size = le32_to_cpu(s->here->e_value_size); + free += EXT3_XATTR_SIZE(size); + } + free += EXT3_XATTR_LEN(name_len); + } + if (i->value) { + if (free < EXT3_XATTR_LEN(name_len) + + EXT3_XATTR_SIZE(i->value_len)) + return -ENOSPC; + } + + if (i->value && s->not_found) { + /* Insert the new name. */ + size_t size = EXT3_XATTR_LEN(name_len); + size_t rest = (void *)last - (void *)s->here + sizeof(__u32); + memmove((void *)s->here + size, s->here, rest); + memset(s->here, 0, size); + s->here->e_name_index = i->name_index; + s->here->e_name_len = name_len; + memcpy(s->here->e_name, i->name, name_len); + } else { + if (!s->here->e_value_block && s->here->e_value_size) { + void *first_val = s->base + min_offs; + size_t offs = le16_to_cpu(s->here->e_value_offs); + void *val = s->base + offs; + size_t size = EXT3_XATTR_SIZE( + le32_to_cpu(s->here->e_value_size)); + + if (i->value && size == EXT3_XATTR_SIZE(i->value_len)) { + /* The old and the new value have the same + size. Just replace. */ + s->here->e_value_size = + cpu_to_le32(i->value_len); + memset(val + size - EXT3_XATTR_PAD, 0, + EXT3_XATTR_PAD); /* Clear pad bytes. */ + memcpy(val, i->value, i->value_len); + return 0; + } + + /* Remove the old value. */ + memmove(first_val + size, first_val, val - first_val); + memset(first_val, 0, size); + s->here->e_value_size = 0; + s->here->e_value_offs = 0; + min_offs += size; + + /* Adjust all value offsets. */ + last = s->first; + while (!IS_LAST_ENTRY(last)) { + size_t o = le16_to_cpu(last->e_value_offs); + if (!last->e_value_block && + last->e_value_size && o < offs) + last->e_value_offs = + cpu_to_le16(o + size); + last = EXT3_XATTR_NEXT(last); + } + } + if (!i->value) { + /* Remove the old name. */ + size_t size = EXT3_XATTR_LEN(name_len); + last = ENTRY((void *)last - size); + memmove(s->here, (void *)s->here + size, + (void *)last - (void *)s->here + sizeof(__u32)); + memset(last, 0, size); + } + } + + if (i->value) { + /* Insert the new value. */ + s->here->e_value_size = cpu_to_le32(i->value_len); + if (i->value_len) { + size_t size = EXT3_XATTR_SIZE(i->value_len); + void *val = s->base + min_offs - size; + s->here->e_value_offs = cpu_to_le16(min_offs - size); + memset(val + size - EXT3_XATTR_PAD, 0, + EXT3_XATTR_PAD); /* Clear the pad bytes. */ + memcpy(val, i->value, i->value_len); + } + } + return 0; +} + +struct ext3_xattr_block_find { + struct ext3_xattr_search s; + struct buffer_head *bh; +}; + +static int +ext3_xattr_block_find(struct inode *inode, struct ext3_xattr_info *i, + struct ext3_xattr_block_find *bs) +{ + struct super_block *sb = inode->i_sb; + int error; + + ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", + i->name_index, i->name, i->value, (long)i->value_len); + + if (EXT3_I(inode)->i_file_acl) { + /* The inode already has an extended attribute block. */ + bs->bh = sb_bread(sb, EXT3_I(inode)->i_file_acl); + error = -EIO; + if (!bs->bh) + goto cleanup; + ea_bdebug(bs->bh, "b_count=%d, refcount=%d", + atomic_read(&(bs->bh->b_count)), + le32_to_cpu(BHDR(bs->bh)->h_refcount)); + if (ext3_xattr_check_block(bs->bh)) { + ext3_error(sb, __func__, + "inode %lu: bad block "E3FSBLK, inode->i_ino, + EXT3_I(inode)->i_file_acl); + error = -EIO; + goto cleanup; + } + /* Find the named attribute. */ + bs->s.base = BHDR(bs->bh); + bs->s.first = BFIRST(bs->bh); + bs->s.end = bs->bh->b_data + bs->bh->b_size; + bs->s.here = bs->s.first; + error = ext3_xattr_find_entry(&bs->s.here, i->name_index, + i->name, bs->bh->b_size, 1); + if (error && error != -ENODATA) + goto cleanup; + bs->s.not_found = error; + } + error = 0; + +cleanup: + return error; +} + +static int +ext3_xattr_block_set(handle_t *handle, struct inode *inode, + struct ext3_xattr_info *i, + struct ext3_xattr_block_find *bs) +{ + struct super_block *sb = inode->i_sb; + struct buffer_head *new_bh = NULL; + struct ext3_xattr_search *s = &bs->s; + struct mb_cache_entry *ce = NULL; + int error = 0; + +#define header(x) ((struct ext3_xattr_header *)(x)) + + if (i->value && i->value_len > sb->s_blocksize) + return -ENOSPC; + if (s->base) { + ce = mb_cache_entry_get(ext3_xattr_cache, bs->bh->b_bdev, + bs->bh->b_blocknr); + error = ext3_journal_get_write_access(handle, bs->bh); + if (error) + goto cleanup; + lock_buffer(bs->bh); + + if (header(s->base)->h_refcount == cpu_to_le32(1)) { + if (ce) { + mb_cache_entry_free(ce); + ce = NULL; + } + ea_bdebug(bs->bh, "modifying in-place"); + error = ext3_xattr_set_entry(i, s); + if (!error) { + if (!IS_LAST_ENTRY(s->first)) + ext3_xattr_rehash(header(s->base), + s->here); + ext3_xattr_cache_insert(bs->bh); + } + unlock_buffer(bs->bh); + if (error == -EIO) + goto bad_block; + if (!error) + error = ext3_journal_dirty_metadata(handle, + bs->bh); + if (error) + goto cleanup; + goto inserted; + } else { + int offset = (char *)s->here - bs->bh->b_data; + + unlock_buffer(bs->bh); + journal_release_buffer(handle, bs->bh); + + if (ce) { + mb_cache_entry_release(ce); + ce = NULL; + } + ea_bdebug(bs->bh, "cloning"); + s->base = kmalloc(bs->bh->b_size, GFP_NOFS); + error = -ENOMEM; + if (s->base == NULL) + goto cleanup; + memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); + s->first = ENTRY(header(s->base)+1); + header(s->base)->h_refcount = cpu_to_le32(1); + s->here = ENTRY(s->base + offset); + s->end = s->base + bs->bh->b_size; + } + } else { + /* Allocate a buffer where we construct the new block. */ + s->base = kzalloc(sb->s_blocksize, GFP_NOFS); + /* assert(header == s->base) */ + error = -ENOMEM; + if (s->base == NULL) + goto cleanup; + header(s->base)->h_magic = cpu_to_le32(EXT3_XATTR_MAGIC); + header(s->base)->h_blocks = cpu_to_le32(1); + header(s->base)->h_refcount = cpu_to_le32(1); + s->first = ENTRY(header(s->base)+1); + s->here = ENTRY(header(s->base)+1); + s->end = s->base + sb->s_blocksize; + } + + error = ext3_xattr_set_entry(i, s); + if (error == -EIO) + goto bad_block; + if (error) + goto cleanup; + if (!IS_LAST_ENTRY(s->first)) + ext3_xattr_rehash(header(s->base), s->here); + +inserted: + if (!IS_LAST_ENTRY(s->first)) { + new_bh = ext3_xattr_cache_find(inode, header(s->base), &ce); + if (new_bh) { + /* We found an identical block in the cache. */ + if (new_bh == bs->bh) + ea_bdebug(new_bh, "keeping"); + else { + /* The old block is released after updating + the inode. */ + error = dquot_alloc_block(inode, 1); + if (error) + goto cleanup; + error = ext3_journal_get_write_access(handle, + new_bh); + if (error) + goto cleanup_dquot; + lock_buffer(new_bh); + le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); + ea_bdebug(new_bh, "reusing; refcount now=%d", + le32_to_cpu(BHDR(new_bh)->h_refcount)); + unlock_buffer(new_bh); + error = ext3_journal_dirty_metadata(handle, + new_bh); + if (error) + goto cleanup_dquot; + } + mb_cache_entry_release(ce); + ce = NULL; + } else if (bs->bh && s->base == bs->bh->b_data) { + /* We were modifying this block in-place. */ + ea_bdebug(bs->bh, "keeping this block"); + new_bh = bs->bh; + get_bh(new_bh); + } else { + /* We need to allocate a new block */ + ext3_fsblk_t goal = ext3_group_first_block_no(sb, + EXT3_I(inode)->i_block_group); + ext3_fsblk_t block; + + /* + * Protect us agaist concurrent allocations to the + * same inode from ext3_..._writepage(). Reservation + * code does not expect racing allocations. + */ + mutex_lock(&EXT3_I(inode)->truncate_mutex); + block = ext3_new_block(handle, inode, goal, &error); + mutex_unlock(&EXT3_I(inode)->truncate_mutex); + if (error) + goto cleanup; + ea_idebug(inode, "creating block %d", block); + + new_bh = sb_getblk(sb, block); + if (unlikely(!new_bh)) { +getblk_failed: + ext3_free_blocks(handle, inode, block, 1); + error = -ENOMEM; + goto cleanup; + } + lock_buffer(new_bh); + error = ext3_journal_get_create_access(handle, new_bh); + if (error) { + unlock_buffer(new_bh); + goto getblk_failed; + } + memcpy(new_bh->b_data, s->base, new_bh->b_size); + set_buffer_uptodate(new_bh); + unlock_buffer(new_bh); + ext3_xattr_cache_insert(new_bh); + error = ext3_journal_dirty_metadata(handle, new_bh); + if (error) + goto cleanup; + } + } + + /* Update the inode. */ + EXT3_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; + + /* Drop the previous xattr block. */ + if (bs->bh && bs->bh != new_bh) + ext3_xattr_release_block(handle, inode, bs->bh); + error = 0; + +cleanup: + if (ce) + mb_cache_entry_release(ce); + brelse(new_bh); + if (!(bs->bh && s->base == bs->bh->b_data)) + kfree(s->base); + + return error; + +cleanup_dquot: + dquot_free_block(inode, 1); + goto cleanup; + +bad_block: + ext3_error(inode->i_sb, __func__, + "inode %lu: bad block "E3FSBLK, inode->i_ino, + EXT3_I(inode)->i_file_acl); + goto cleanup; + +#undef header +} + +struct ext3_xattr_ibody_find { + struct ext3_xattr_search s; + struct ext3_iloc iloc; +}; + +static int +ext3_xattr_ibody_find(struct inode *inode, struct ext3_xattr_info *i, + struct ext3_xattr_ibody_find *is) +{ + struct ext3_xattr_ibody_header *header; + struct ext3_inode *raw_inode; + int error; + + if (EXT3_I(inode)->i_extra_isize == 0) + return 0; + raw_inode = ext3_raw_inode(&is->iloc); + header = IHDR(inode, raw_inode); + is->s.base = is->s.first = IFIRST(header); + is->s.here = is->s.first; + is->s.end = (void *)raw_inode + EXT3_SB(inode->i_sb)->s_inode_size; + if (ext3_test_inode_state(inode, EXT3_STATE_XATTR)) { + error = ext3_xattr_check_names(IFIRST(header), is->s.end); + if (error) + return error; + /* Find the named attribute. */ + error = ext3_xattr_find_entry(&is->s.here, i->name_index, + i->name, is->s.end - + (void *)is->s.base, 0); + if (error && error != -ENODATA) + return error; + is->s.not_found = error; + } + return 0; +} + +static int +ext3_xattr_ibody_set(handle_t *handle, struct inode *inode, + struct ext3_xattr_info *i, + struct ext3_xattr_ibody_find *is) +{ + struct ext3_xattr_ibody_header *header; + struct ext3_xattr_search *s = &is->s; + int error; + + if (EXT3_I(inode)->i_extra_isize == 0) + return -ENOSPC; + error = ext3_xattr_set_entry(i, s); + if (error) + return error; + header = IHDR(inode, ext3_raw_inode(&is->iloc)); + if (!IS_LAST_ENTRY(s->first)) { + header->h_magic = cpu_to_le32(EXT3_XATTR_MAGIC); + ext3_set_inode_state(inode, EXT3_STATE_XATTR); + } else { + header->h_magic = cpu_to_le32(0); + ext3_clear_inode_state(inode, EXT3_STATE_XATTR); + } + return 0; +} + +/* + * ext3_xattr_set_handle() + * + * Create, replace or remove an extended attribute for this inode. Value + * is NULL to remove an existing extended attribute, and non-NULL to + * either replace an existing extended attribute, or create a new extended + * attribute. The flags XATTR_REPLACE and XATTR_CREATE + * specify that an extended attribute must exist and must not exist + * previous to the call, respectively. + * + * Returns 0, or a negative error number on failure. + */ +int +ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, + const char *name, const void *value, size_t value_len, + int flags) +{ + struct ext3_xattr_info i = { + .name_index = name_index, + .name = name, + .value = value, + .value_len = value_len, + + }; + struct ext3_xattr_ibody_find is = { + .s = { .not_found = -ENODATA, }, + }; + struct ext3_xattr_block_find bs = { + .s = { .not_found = -ENODATA, }, + }; + int error; + + if (!name) + return -EINVAL; + if (strlen(name) > 255) + return -ERANGE; + down_write(&EXT3_I(inode)->xattr_sem); + error = ext3_get_inode_loc(inode, &is.iloc); + if (error) + goto cleanup; + + error = ext3_journal_get_write_access(handle, is.iloc.bh); + if (error) + goto cleanup; + + if (ext3_test_inode_state(inode, EXT3_STATE_NEW)) { + struct ext3_inode *raw_inode = ext3_raw_inode(&is.iloc); + memset(raw_inode, 0, EXT3_SB(inode->i_sb)->s_inode_size); + ext3_clear_inode_state(inode, EXT3_STATE_NEW); + } + + error = ext3_xattr_ibody_find(inode, &i, &is); + if (error) + goto cleanup; + if (is.s.not_found) + error = ext3_xattr_block_find(inode, &i, &bs); + if (error) + goto cleanup; + if (is.s.not_found && bs.s.not_found) { + error = -ENODATA; + if (flags & XATTR_REPLACE) + goto cleanup; + error = 0; + if (!value) + goto cleanup; + } else { + error = -EEXIST; + if (flags & XATTR_CREATE) + goto cleanup; + } + if (!value) { + if (!is.s.not_found) + error = ext3_xattr_ibody_set(handle, inode, &i, &is); + else if (!bs.s.not_found) + error = ext3_xattr_block_set(handle, inode, &i, &bs); + } else { + error = ext3_xattr_ibody_set(handle, inode, &i, &is); + if (!error && !bs.s.not_found) { + i.value = NULL; + error = ext3_xattr_block_set(handle, inode, &i, &bs); + } else if (error == -ENOSPC) { + if (EXT3_I(inode)->i_file_acl && !bs.s.base) { + error = ext3_xattr_block_find(inode, &i, &bs); + if (error) + goto cleanup; + } + error = ext3_xattr_block_set(handle, inode, &i, &bs); + if (error) + goto cleanup; + if (!is.s.not_found) { + i.value = NULL; + error = ext3_xattr_ibody_set(handle, inode, &i, + &is); + } + } + } + if (!error) { + ext3_xattr_update_super_block(handle, inode->i_sb); + inode->i_ctime = CURRENT_TIME_SEC; + error = ext3_mark_iloc_dirty(handle, inode, &is.iloc); + /* + * The bh is consumed by ext3_mark_iloc_dirty, even with + * error != 0. + */ + is.iloc.bh = NULL; + if (IS_SYNC(inode)) + handle->h_sync = 1; + } + +cleanup: + brelse(is.iloc.bh); + brelse(bs.bh); + up_write(&EXT3_I(inode)->xattr_sem); + return error; +} + +/* + * ext3_xattr_set() + * + * Like ext3_xattr_set_handle, but start from an inode. This extended + * attribute modification is a filesystem transaction by itself. + * + * Returns 0, or a negative error number on failure. + */ +int +ext3_xattr_set(struct inode *inode, int name_index, const char *name, + const void *value, size_t value_len, int flags) +{ + handle_t *handle; + int error, retries = 0; + +retry: + handle = ext3_journal_start(inode, EXT3_DATA_TRANS_BLOCKS(inode->i_sb)); + if (IS_ERR(handle)) { + error = PTR_ERR(handle); + } else { + int error2; + + error = ext3_xattr_set_handle(handle, inode, name_index, name, + value, value_len, flags); + error2 = ext3_journal_stop(handle); + if (error == -ENOSPC && + ext3_should_retry_alloc(inode->i_sb, &retries)) + goto retry; + if (error == 0) + error = error2; + } + + return error; +} + +/* + * ext3_xattr_delete_inode() + * + * Free extended attribute resources associated with this inode. This + * is called immediately before an inode is freed. We have exclusive + * access to the inode. + */ +void +ext3_xattr_delete_inode(handle_t *handle, struct inode *inode) +{ + struct buffer_head *bh = NULL; + + if (!EXT3_I(inode)->i_file_acl) + goto cleanup; + bh = sb_bread(inode->i_sb, EXT3_I(inode)->i_file_acl); + if (!bh) { + ext3_error(inode->i_sb, __func__, + "inode %lu: block "E3FSBLK" read error", inode->i_ino, + EXT3_I(inode)->i_file_acl); + goto cleanup; + } + if (BHDR(bh)->h_magic != cpu_to_le32(EXT3_XATTR_MAGIC) || + BHDR(bh)->h_blocks != cpu_to_le32(1)) { + ext3_error(inode->i_sb, __func__, + "inode %lu: bad block "E3FSBLK, inode->i_ino, + EXT3_I(inode)->i_file_acl); + goto cleanup; + } + ext3_xattr_release_block(handle, inode, bh); + EXT3_I(inode)->i_file_acl = 0; + +cleanup: + brelse(bh); +} + +/* + * ext3_xattr_put_super() + * + * This is called when a file system is unmounted. + */ +void +ext3_xattr_put_super(struct super_block *sb) +{ + mb_cache_shrink(sb->s_bdev); +} + +/* + * ext3_xattr_cache_insert() + * + * Create a new entry in the extended attribute cache, and insert + * it unless such an entry is already in the cache. + * + * Returns 0, or a negative error number on failure. + */ +static void +ext3_xattr_cache_insert(struct buffer_head *bh) +{ + __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); + struct mb_cache_entry *ce; + int error; + + ce = mb_cache_entry_alloc(ext3_xattr_cache, GFP_NOFS); + if (!ce) { + ea_bdebug(bh, "out of memory"); + return; + } + error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); + if (error) { + mb_cache_entry_free(ce); + if (error == -EBUSY) { + ea_bdebug(bh, "already in cache"); + error = 0; + } + } else { + ea_bdebug(bh, "inserting [%x]", (int)hash); + mb_cache_entry_release(ce); + } +} + +/* + * ext3_xattr_cmp() + * + * Compare two extended attribute blocks for equality. + * + * Returns 0 if the blocks are equal, 1 if they differ, and + * a negative error number on errors. + */ +static int +ext3_xattr_cmp(struct ext3_xattr_header *header1, + struct ext3_xattr_header *header2) +{ + struct ext3_xattr_entry *entry1, *entry2; + + entry1 = ENTRY(header1+1); + entry2 = ENTRY(header2+1); + while (!IS_LAST_ENTRY(entry1)) { + if (IS_LAST_ENTRY(entry2)) + return 1; + if (entry1->e_hash != entry2->e_hash || + entry1->e_name_index != entry2->e_name_index || + entry1->e_name_len != entry2->e_name_len || + entry1->e_value_size != entry2->e_value_size || + memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) + return 1; + if (entry1->e_value_block != 0 || entry2->e_value_block != 0) + return -EIO; + if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), + (char *)header2 + le16_to_cpu(entry2->e_value_offs), + le32_to_cpu(entry1->e_value_size))) + return 1; + + entry1 = EXT3_XATTR_NEXT(entry1); + entry2 = EXT3_XATTR_NEXT(entry2); + } + if (!IS_LAST_ENTRY(entry2)) + return 1; + return 0; +} + +/* + * ext3_xattr_cache_find() + * + * Find an identical extended attribute block. + * + * Returns a pointer to the block found, or NULL if such a block was + * not found or an error occurred. + */ +static struct buffer_head * +ext3_xattr_cache_find(struct inode *inode, struct ext3_xattr_header *header, + struct mb_cache_entry **pce) +{ + __u32 hash = le32_to_cpu(header->h_hash); + struct mb_cache_entry *ce; + + if (!header->h_hash) + return NULL; /* never share */ + ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); +again: + ce = mb_cache_entry_find_first(ext3_xattr_cache, inode->i_sb->s_bdev, + hash); + while (ce) { + struct buffer_head *bh; + + if (IS_ERR(ce)) { + if (PTR_ERR(ce) == -EAGAIN) + goto again; + break; + } + bh = sb_bread(inode->i_sb, ce->e_block); + if (!bh) { + ext3_error(inode->i_sb, __func__, + "inode %lu: block %lu read error", + inode->i_ino, (unsigned long) ce->e_block); + } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= + EXT3_XATTR_REFCOUNT_MAX) { + ea_idebug(inode, "block %lu refcount %d>=%d", + (unsigned long) ce->e_block, + le32_to_cpu(BHDR(bh)->h_refcount), + EXT3_XATTR_REFCOUNT_MAX); + } else if (ext3_xattr_cmp(header, BHDR(bh)) == 0) { + *pce = ce; + return bh; + } + brelse(bh); + ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); + } + return NULL; +} + +#define NAME_HASH_SHIFT 5 +#define VALUE_HASH_SHIFT 16 + +/* + * ext3_xattr_hash_entry() + * + * Compute the hash of an extended attribute. + */ +static inline void ext3_xattr_hash_entry(struct ext3_xattr_header *header, + struct ext3_xattr_entry *entry) +{ + __u32 hash = 0; + char *name = entry->e_name; + int n; + + for (n=0; n < entry->e_name_len; n++) { + hash = (hash << NAME_HASH_SHIFT) ^ + (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ + *name++; + } + + if (entry->e_value_block == 0 && entry->e_value_size != 0) { + __le32 *value = (__le32 *)((char *)header + + le16_to_cpu(entry->e_value_offs)); + for (n = (le32_to_cpu(entry->e_value_size) + + EXT3_XATTR_ROUND) >> EXT3_XATTR_PAD_BITS; n; n--) { + hash = (hash << VALUE_HASH_SHIFT) ^ + (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ + le32_to_cpu(*value++); + } + } + entry->e_hash = cpu_to_le32(hash); +} + +#undef NAME_HASH_SHIFT +#undef VALUE_HASH_SHIFT + +#define BLOCK_HASH_SHIFT 16 + +/* + * ext3_xattr_rehash() + * + * Re-compute the extended attribute hash value after an entry has changed. + */ +static void ext3_xattr_rehash(struct ext3_xattr_header *header, + struct ext3_xattr_entry *entry) +{ + struct ext3_xattr_entry *here; + __u32 hash = 0; + + ext3_xattr_hash_entry(header, entry); + here = ENTRY(header+1); + while (!IS_LAST_ENTRY(here)) { + if (!here->e_hash) { + /* Block is not shared if an entry's hash value == 0 */ + hash = 0; + break; + } + hash = (hash << BLOCK_HASH_SHIFT) ^ + (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ + le32_to_cpu(here->e_hash); + here = EXT3_XATTR_NEXT(here); + } + header->h_hash = cpu_to_le32(hash); +} + +#undef BLOCK_HASH_SHIFT + +int __init +init_ext3_xattr(void) +{ + ext3_xattr_cache = mb_cache_create("ext3_xattr", 6); + if (!ext3_xattr_cache) + return -ENOMEM; + return 0; +} + +void +exit_ext3_xattr(void) +{ + if (ext3_xattr_cache) + mb_cache_destroy(ext3_xattr_cache); + ext3_xattr_cache = NULL; +} diff --git a/kernel/fs/ext3/xattr.h b/kernel/fs/ext3/xattr.h new file mode 100644 index 000000000..32e93ebf8 --- /dev/null +++ b/kernel/fs/ext3/xattr.h @@ -0,0 +1,136 @@ +/* + File: fs/ext3/xattr.h + + On-disk format of extended attributes for the ext3 filesystem. + + (C) 2001 Andreas Gruenbacher, +*/ + +#include + +/* Magic value in attribute blocks */ +#define EXT3_XATTR_MAGIC 0xEA020000 + +/* Maximum number of references to one attribute block */ +#define EXT3_XATTR_REFCOUNT_MAX 1024 + +/* Name indexes */ +#define EXT3_XATTR_INDEX_USER 1 +#define EXT3_XATTR_INDEX_POSIX_ACL_ACCESS 2 +#define EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT 3 +#define EXT3_XATTR_INDEX_TRUSTED 4 +#define EXT3_XATTR_INDEX_LUSTRE 5 +#define EXT3_XATTR_INDEX_SECURITY 6 + +struct ext3_xattr_header { + __le32 h_magic; /* magic number for identification */ + __le32 h_refcount; /* reference count */ + __le32 h_blocks; /* number of disk blocks used */ + __le32 h_hash; /* hash value of all attributes */ + __u32 h_reserved[4]; /* zero right now */ +}; + +struct ext3_xattr_ibody_header { + __le32 h_magic; /* magic number for identification */ +}; + +struct ext3_xattr_entry { + __u8 e_name_len; /* length of name */ + __u8 e_name_index; /* attribute name index */ + __le16 e_value_offs; /* offset in disk block of value */ + __le32 e_value_block; /* disk block attribute is stored on (n/i) */ + __le32 e_value_size; /* size of attribute value */ + __le32 e_hash; /* hash value of name and value */ + char e_name[0]; /* attribute name */ +}; + +#define EXT3_XATTR_PAD_BITS 2 +#define EXT3_XATTR_PAD (1<e_name_len)) ) +#define EXT3_XATTR_SIZE(size) \ + (((size) + EXT3_XATTR_ROUND) & ~EXT3_XATTR_ROUND) + +# ifdef CONFIG_EXT3_FS_XATTR + +extern const struct xattr_handler ext3_xattr_user_handler; +extern const struct xattr_handler ext3_xattr_trusted_handler; +extern const struct xattr_handler ext3_xattr_security_handler; + +extern ssize_t ext3_listxattr(struct dentry *, char *, size_t); + +extern int ext3_xattr_get(struct inode *, int, const char *, void *, size_t); +extern int ext3_xattr_set(struct inode *, int, const char *, const void *, size_t, int); +extern int ext3_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int); + +extern void ext3_xattr_delete_inode(handle_t *, struct inode *); +extern void ext3_xattr_put_super(struct super_block *); + +extern int init_ext3_xattr(void); +extern void exit_ext3_xattr(void); + +extern const struct xattr_handler *ext3_xattr_handlers[]; + +# else /* CONFIG_EXT3_FS_XATTR */ + +static inline int +ext3_xattr_get(struct inode *inode, int name_index, const char *name, + void *buffer, size_t size, int flags) +{ + return -EOPNOTSUPP; +} + +static inline int +ext3_xattr_set(struct inode *inode, int name_index, const char *name, + const void *value, size_t size, int flags) +{ + return -EOPNOTSUPP; +} + +static inline int +ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, + const char *name, const void *value, size_t size, int flags) +{ + return -EOPNOTSUPP; +} + +static inline void +ext3_xattr_delete_inode(handle_t *handle, struct inode *inode) +{ +} + +static inline void +ext3_xattr_put_super(struct super_block *sb) +{ +} + +static inline int +init_ext3_xattr(void) +{ + return 0; +} + +static inline void +exit_ext3_xattr(void) +{ +} + +#define ext3_xattr_handlers NULL + +# endif /* CONFIG_EXT3_FS_XATTR */ + +#ifdef CONFIG_EXT3_FS_SECURITY +extern int ext3_init_security(handle_t *handle, struct inode *inode, + struct inode *dir, const struct qstr *qstr); +#else +static inline int ext3_init_security(handle_t *handle, struct inode *inode, + struct inode *dir, const struct qstr *qstr) +{ + return 0; +} +#endif diff --git a/kernel/fs/ext3/xattr_security.c b/kernel/fs/ext3/xattr_security.c new file mode 100644 index 000000000..c9506d5e3 --- /dev/null +++ b/kernel/fs/ext3/xattr_security.c @@ -0,0 +1,78 @@ +/* + * linux/fs/ext3/xattr_security.c + * Handler for storing security labels as extended attributes. + */ + +#include +#include "ext3.h" +#include "xattr.h" + +static size_t +ext3_xattr_security_list(struct dentry *dentry, char *list, size_t list_size, + const char *name, size_t name_len, int type) +{ + const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN; + const size_t total_len = prefix_len + name_len + 1; + + + if (list && total_len <= list_size) { + memcpy(list, XATTR_SECURITY_PREFIX, prefix_len); + memcpy(list+prefix_len, name, name_len); + list[prefix_len + name_len] = '\0'; + } + return total_len; +} + +static int +ext3_xattr_security_get(struct dentry *dentry, const char *name, + void *buffer, size_t size, int type) +{ + if (strcmp(name, "") == 0) + return -EINVAL; + return ext3_xattr_get(d_inode(dentry), EXT3_XATTR_INDEX_SECURITY, + name, buffer, size); +} + +static int +ext3_xattr_security_set(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags, int type) +{ + if (strcmp(name, "") == 0) + return -EINVAL; + return ext3_xattr_set(d_inode(dentry), EXT3_XATTR_INDEX_SECURITY, + name, value, size, flags); +} + +static int ext3_initxattrs(struct inode *inode, + const struct xattr *xattr_array, + void *fs_info) +{ + const struct xattr *xattr; + handle_t *handle = fs_info; + int err = 0; + + for (xattr = xattr_array; xattr->name != NULL; xattr++) { + err = ext3_xattr_set_handle(handle, inode, + EXT3_XATTR_INDEX_SECURITY, + xattr->name, xattr->value, + xattr->value_len, 0); + if (err < 0) + break; + } + return err; +} + +int +ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir, + const struct qstr *qstr) +{ + return security_inode_init_security(inode, dir, qstr, + &ext3_initxattrs, handle); +} + +const struct xattr_handler ext3_xattr_security_handler = { + .prefix = XATTR_SECURITY_PREFIX, + .list = ext3_xattr_security_list, + .get = ext3_xattr_security_get, + .set = ext3_xattr_security_set, +}; diff --git a/kernel/fs/ext3/xattr_trusted.c b/kernel/fs/ext3/xattr_trusted.c new file mode 100644 index 000000000..206cc66dc --- /dev/null +++ b/kernel/fs/ext3/xattr_trusted.c @@ -0,0 +1,54 @@ +/* + * linux/fs/ext3/xattr_trusted.c + * Handler for trusted extended attributes. + * + * Copyright (C) 2003 by Andreas Gruenbacher, + */ + +#include "ext3.h" +#include "xattr.h" + +static size_t +ext3_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size, + const char *name, size_t name_len, int type) +{ + const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN; + const size_t total_len = prefix_len + name_len + 1; + + if (!capable(CAP_SYS_ADMIN)) + return 0; + + if (list && total_len <= list_size) { + memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); + memcpy(list+prefix_len, name, name_len); + list[prefix_len + name_len] = '\0'; + } + return total_len; +} + +static int +ext3_xattr_trusted_get(struct dentry *dentry, const char *name, + void *buffer, size_t size, int type) +{ + if (strcmp(name, "") == 0) + return -EINVAL; + return ext3_xattr_get(d_inode(dentry), EXT3_XATTR_INDEX_TRUSTED, + name, buffer, size); +} + +static int +ext3_xattr_trusted_set(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags, int type) +{ + if (strcmp(name, "") == 0) + return -EINVAL; + return ext3_xattr_set(d_inode(dentry), EXT3_XATTR_INDEX_TRUSTED, name, + value, size, flags); +} + +const struct xattr_handler ext3_xattr_trusted_handler = { + .prefix = XATTR_TRUSTED_PREFIX, + .list = ext3_xattr_trusted_list, + .get = ext3_xattr_trusted_get, + .set = ext3_xattr_trusted_set, +}; diff --git a/kernel/fs/ext3/xattr_user.c b/kernel/fs/ext3/xattr_user.c new file mode 100644 index 000000000..021508ad1 --- /dev/null +++ b/kernel/fs/ext3/xattr_user.c @@ -0,0 +1,58 @@ +/* + * linux/fs/ext3/xattr_user.c + * Handler for extended user attributes. + * + * Copyright (C) 2001 by Andreas Gruenbacher, + */ + +#include "ext3.h" +#include "xattr.h" + +static size_t +ext3_xattr_user_list(struct dentry *dentry, char *list, size_t list_size, + const char *name, size_t name_len, int type) +{ + const size_t prefix_len = XATTR_USER_PREFIX_LEN; + const size_t total_len = prefix_len + name_len + 1; + + if (!test_opt(dentry->d_sb, XATTR_USER)) + return 0; + + if (list && total_len <= list_size) { + memcpy(list, XATTR_USER_PREFIX, prefix_len); + memcpy(list+prefix_len, name, name_len); + list[prefix_len + name_len] = '\0'; + } + return total_len; +} + +static int +ext3_xattr_user_get(struct dentry *dentry, const char *name, void *buffer, + size_t size, int type) +{ + if (strcmp(name, "") == 0) + return -EINVAL; + if (!test_opt(dentry->d_sb, XATTR_USER)) + return -EOPNOTSUPP; + return ext3_xattr_get(d_inode(dentry), EXT3_XATTR_INDEX_USER, + name, buffer, size); +} + +static int +ext3_xattr_user_set(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags, int type) +{ + if (strcmp(name, "") == 0) + return -EINVAL; + if (!test_opt(dentry->d_sb, XATTR_USER)) + return -EOPNOTSUPP; + return ext3_xattr_set(d_inode(dentry), EXT3_XATTR_INDEX_USER, + name, value, size, flags); +} + +const struct xattr_handler ext3_xattr_user_handler = { + .prefix = XATTR_USER_PREFIX, + .list = ext3_xattr_user_list, + .get = ext3_xattr_user_get, + .set = ext3_xattr_user_set, +}; -- cgit 1.2.3-korg