summaryrefslogtreecommitdiffstats
path: root/kernel/fs/ceph/super.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/fs/ceph/super.c')
-rw-r--r--kernel/fs/ceph/super.c1059
1 files changed, 1059 insertions, 0 deletions
diff --git a/kernel/fs/ceph/super.c b/kernel/fs/ceph/super.c
new file mode 100644
index 000000000..4e9905374
--- /dev/null
+++ b/kernel/fs/ceph/super.c
@@ -0,0 +1,1059 @@
+
+#include <linux/ceph/ceph_debug.h>
+
+#include <linux/backing-dev.h>
+#include <linux/ctype.h>
+#include <linux/fs.h>
+#include <linux/inet.h>
+#include <linux/in6.h>
+#include <linux/module.h>
+#include <linux/mount.h>
+#include <linux/parser.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/statfs.h>
+#include <linux/string.h>
+
+#include "super.h"
+#include "mds_client.h"
+#include "cache.h"
+
+#include <linux/ceph/ceph_features.h>
+#include <linux/ceph/decode.h>
+#include <linux/ceph/mon_client.h>
+#include <linux/ceph/auth.h>
+#include <linux/ceph/debugfs.h>
+
+/*
+ * Ceph superblock operations
+ *
+ * Handle the basics of mounting, unmounting.
+ */
+
+/*
+ * super ops
+ */
+static void ceph_put_super(struct super_block *s)
+{
+ struct ceph_fs_client *fsc = ceph_sb_to_client(s);
+
+ dout("put_super\n");
+ ceph_mdsc_close_sessions(fsc->mdsc);
+}
+
+static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
+ struct ceph_monmap *monmap = fsc->client->monc.monmap;
+ struct ceph_statfs st;
+ u64 fsid;
+ int err;
+
+ dout("statfs\n");
+ err = ceph_monc_do_statfs(&fsc->client->monc, &st);
+ if (err < 0)
+ return err;
+
+ /* fill in kstatfs */
+ buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
+
+ /*
+ * express utilization in terms of large blocks to avoid
+ * overflow on 32-bit machines.
+ *
+ * NOTE: for the time being, we make bsize == frsize to humor
+ * not-yet-ancient versions of glibc that are broken.
+ * Someday, we will probably want to report a real block
+ * size... whatever that may mean for a network file system!
+ */
+ buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
+ buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
+ buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
+ buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
+ buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
+
+ buf->f_files = le64_to_cpu(st.num_objects);
+ buf->f_ffree = -1;
+ buf->f_namelen = NAME_MAX;
+
+ /* leave fsid little-endian, regardless of host endianness */
+ fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
+ buf->f_fsid.val[0] = fsid & 0xffffffff;
+ buf->f_fsid.val[1] = fsid >> 32;
+
+ return 0;
+}
+
+
+static int ceph_sync_fs(struct super_block *sb, int wait)
+{
+ struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
+
+ if (!wait) {
+ dout("sync_fs (non-blocking)\n");
+ ceph_flush_dirty_caps(fsc->mdsc);
+ dout("sync_fs (non-blocking) done\n");
+ return 0;
+ }
+
+ dout("sync_fs (blocking)\n");
+ ceph_osdc_sync(&fsc->client->osdc);
+ ceph_mdsc_sync(fsc->mdsc);
+ dout("sync_fs (blocking) done\n");
+ return 0;
+}
+
+/*
+ * mount options
+ */
+enum {
+ Opt_wsize,
+ Opt_rsize,
+ Opt_rasize,
+ Opt_caps_wanted_delay_min,
+ Opt_caps_wanted_delay_max,
+ Opt_cap_release_safety,
+ Opt_readdir_max_entries,
+ Opt_readdir_max_bytes,
+ Opt_congestion_kb,
+ Opt_last_int,
+ /* int args above */
+ Opt_snapdirname,
+ Opt_last_string,
+ /* string args above */
+ Opt_dirstat,
+ Opt_nodirstat,
+ Opt_rbytes,
+ Opt_norbytes,
+ Opt_asyncreaddir,
+ Opt_noasyncreaddir,
+ Opt_dcache,
+ Opt_nodcache,
+ Opt_ino32,
+ Opt_noino32,
+ Opt_fscache,
+ Opt_nofscache,
+#ifdef CONFIG_CEPH_FS_POSIX_ACL
+ Opt_acl,
+#endif
+ Opt_noacl
+};
+
+static match_table_t fsopt_tokens = {
+ {Opt_wsize, "wsize=%d"},
+ {Opt_rsize, "rsize=%d"},
+ {Opt_rasize, "rasize=%d"},
+ {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
+ {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
+ {Opt_cap_release_safety, "cap_release_safety=%d"},
+ {Opt_readdir_max_entries, "readdir_max_entries=%d"},
+ {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
+ {Opt_congestion_kb, "write_congestion_kb=%d"},
+ /* int args above */
+ {Opt_snapdirname, "snapdirname=%s"},
+ /* string args above */
+ {Opt_dirstat, "dirstat"},
+ {Opt_nodirstat, "nodirstat"},
+ {Opt_rbytes, "rbytes"},
+ {Opt_norbytes, "norbytes"},
+ {Opt_asyncreaddir, "asyncreaddir"},
+ {Opt_noasyncreaddir, "noasyncreaddir"},
+ {Opt_dcache, "dcache"},
+ {Opt_nodcache, "nodcache"},
+ {Opt_ino32, "ino32"},
+ {Opt_noino32, "noino32"},
+ {Opt_fscache, "fsc"},
+ {Opt_nofscache, "nofsc"},
+#ifdef CONFIG_CEPH_FS_POSIX_ACL
+ {Opt_acl, "acl"},
+#endif
+ {Opt_noacl, "noacl"},
+ {-1, NULL}
+};
+
+static int parse_fsopt_token(char *c, void *private)
+{
+ struct ceph_mount_options *fsopt = private;
+ substring_t argstr[MAX_OPT_ARGS];
+ int token, intval, ret;
+
+ token = match_token((char *)c, fsopt_tokens, argstr);
+ if (token < 0)
+ return -EINVAL;
+
+ if (token < Opt_last_int) {
+ ret = match_int(&argstr[0], &intval);
+ if (ret < 0) {
+ pr_err("bad mount option arg (not int) "
+ "at '%s'\n", c);
+ return ret;
+ }
+ dout("got int token %d val %d\n", token, intval);
+ } else if (token > Opt_last_int && token < Opt_last_string) {
+ dout("got string token %d val %s\n", token,
+ argstr[0].from);
+ } else {
+ dout("got token %d\n", token);
+ }
+
+ switch (token) {
+ case Opt_snapdirname:
+ kfree(fsopt->snapdir_name);
+ fsopt->snapdir_name = kstrndup(argstr[0].from,
+ argstr[0].to-argstr[0].from,
+ GFP_KERNEL);
+ if (!fsopt->snapdir_name)
+ return -ENOMEM;
+ break;
+
+ /* misc */
+ case Opt_wsize:
+ fsopt->wsize = intval;
+ break;
+ case Opt_rsize:
+ fsopt->rsize = intval;
+ break;
+ case Opt_rasize:
+ fsopt->rasize = intval;
+ break;
+ case Opt_caps_wanted_delay_min:
+ fsopt->caps_wanted_delay_min = intval;
+ break;
+ case Opt_caps_wanted_delay_max:
+ fsopt->caps_wanted_delay_max = intval;
+ break;
+ case Opt_readdir_max_entries:
+ fsopt->max_readdir = intval;
+ break;
+ case Opt_readdir_max_bytes:
+ fsopt->max_readdir_bytes = intval;
+ break;
+ case Opt_congestion_kb:
+ fsopt->congestion_kb = intval;
+ break;
+ case Opt_dirstat:
+ fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
+ break;
+ case Opt_nodirstat:
+ fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
+ break;
+ case Opt_rbytes:
+ fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
+ break;
+ case Opt_norbytes:
+ fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
+ break;
+ case Opt_asyncreaddir:
+ fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
+ break;
+ case Opt_noasyncreaddir:
+ fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
+ break;
+ case Opt_dcache:
+ fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
+ break;
+ case Opt_nodcache:
+ fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
+ break;
+ case Opt_ino32:
+ fsopt->flags |= CEPH_MOUNT_OPT_INO32;
+ break;
+ case Opt_noino32:
+ fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
+ break;
+ case Opt_fscache:
+ fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
+ break;
+ case Opt_nofscache:
+ fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
+ break;
+#ifdef CONFIG_CEPH_FS_POSIX_ACL
+ case Opt_acl:
+ fsopt->sb_flags |= MS_POSIXACL;
+ break;
+#endif
+ case Opt_noacl:
+ fsopt->sb_flags &= ~MS_POSIXACL;
+ break;
+ default:
+ BUG_ON(token);
+ }
+ return 0;
+}
+
+static void destroy_mount_options(struct ceph_mount_options *args)
+{
+ dout("destroy_mount_options %p\n", args);
+ kfree(args->snapdir_name);
+ kfree(args);
+}
+
+static int strcmp_null(const char *s1, const char *s2)
+{
+ if (!s1 && !s2)
+ return 0;
+ if (s1 && !s2)
+ return -1;
+ if (!s1 && s2)
+ return 1;
+ return strcmp(s1, s2);
+}
+
+static int compare_mount_options(struct ceph_mount_options *new_fsopt,
+ struct ceph_options *new_opt,
+ struct ceph_fs_client *fsc)
+{
+ struct ceph_mount_options *fsopt1 = new_fsopt;
+ struct ceph_mount_options *fsopt2 = fsc->mount_options;
+ int ofs = offsetof(struct ceph_mount_options, snapdir_name);
+ int ret;
+
+ ret = memcmp(fsopt1, fsopt2, ofs);
+ if (ret)
+ return ret;
+
+ ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
+ if (ret)
+ return ret;
+
+ return ceph_compare_options(new_opt, fsc->client);
+}
+
+static int parse_mount_options(struct ceph_mount_options **pfsopt,
+ struct ceph_options **popt,
+ int flags, char *options,
+ const char *dev_name,
+ const char **path)
+{
+ struct ceph_mount_options *fsopt;
+ const char *dev_name_end;
+ int err;
+
+ if (!dev_name || !*dev_name)
+ return -EINVAL;
+
+ fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
+ if (!fsopt)
+ return -ENOMEM;
+
+ dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
+
+ fsopt->sb_flags = flags;
+ fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
+
+ fsopt->rsize = CEPH_RSIZE_DEFAULT;
+ fsopt->rasize = CEPH_RASIZE_DEFAULT;
+ fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
+ if (!fsopt->snapdir_name) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
+ fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
+ fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
+ fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
+ fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
+ fsopt->congestion_kb = default_congestion_kb();
+
+ /*
+ * Distinguish the server list from the path in "dev_name".
+ * Internally we do not include the leading '/' in the path.
+ *
+ * "dev_name" will look like:
+ * <server_spec>[,<server_spec>...]:[<path>]
+ * where
+ * <server_spec> is <ip>[:<port>]
+ * <path> is optional, but if present must begin with '/'
+ */
+ dev_name_end = strchr(dev_name, '/');
+ if (dev_name_end) {
+ /* skip over leading '/' for path */
+ *path = dev_name_end + 1;
+ } else {
+ /* path is empty */
+ dev_name_end = dev_name + strlen(dev_name);
+ *path = dev_name_end;
+ }
+ err = -EINVAL;
+ dev_name_end--; /* back up to ':' separator */
+ if (dev_name_end < dev_name || *dev_name_end != ':') {
+ pr_err("device name is missing path (no : separator in %s)\n",
+ dev_name);
+ goto out;
+ }
+ dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
+ dout("server path '%s'\n", *path);
+
+ *popt = ceph_parse_options(options, dev_name, dev_name_end,
+ parse_fsopt_token, (void *)fsopt);
+ if (IS_ERR(*popt)) {
+ err = PTR_ERR(*popt);
+ goto out;
+ }
+
+ /* success */
+ *pfsopt = fsopt;
+ return 0;
+
+out:
+ destroy_mount_options(fsopt);
+ return err;
+}
+
+/**
+ * ceph_show_options - Show mount options in /proc/mounts
+ * @m: seq_file to write to
+ * @root: root of that (sub)tree
+ */
+static int ceph_show_options(struct seq_file *m, struct dentry *root)
+{
+ struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
+ struct ceph_mount_options *fsopt = fsc->mount_options;
+ size_t pos;
+ int ret;
+
+ /* a comma between MNT/MS and client options */
+ seq_putc(m, ',');
+ pos = m->count;
+
+ ret = ceph_print_client_options(m, fsc->client);
+ if (ret)
+ return ret;
+
+ /* retract our comma if no client options */
+ if (m->count == pos)
+ m->count--;
+
+ if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
+ seq_puts(m, ",dirstat");
+ if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
+ seq_puts(m, ",norbytes");
+ if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
+ seq_puts(m, ",noasyncreaddir");
+ if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
+ seq_puts(m, ",nodcache");
+ if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
+ seq_puts(m, ",fsc");
+
+#ifdef CONFIG_CEPH_FS_POSIX_ACL
+ if (fsopt->sb_flags & MS_POSIXACL)
+ seq_puts(m, ",acl");
+ else
+ seq_puts(m, ",noacl");
+#endif
+
+ if (fsopt->wsize)
+ seq_printf(m, ",wsize=%d", fsopt->wsize);
+ if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
+ seq_printf(m, ",rsize=%d", fsopt->rsize);
+ if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
+ seq_printf(m, ",rasize=%d", fsopt->rasize);
+ if (fsopt->congestion_kb != default_congestion_kb())
+ seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
+ if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
+ seq_printf(m, ",caps_wanted_delay_min=%d",
+ fsopt->caps_wanted_delay_min);
+ if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
+ seq_printf(m, ",caps_wanted_delay_max=%d",
+ fsopt->caps_wanted_delay_max);
+ if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
+ seq_printf(m, ",cap_release_safety=%d",
+ fsopt->cap_release_safety);
+ if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
+ seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
+ if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
+ seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
+ if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
+ seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
+
+ return 0;
+}
+
+/*
+ * handle any mon messages the standard library doesn't understand.
+ * return error if we don't either.
+ */
+static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
+{
+ struct ceph_fs_client *fsc = client->private;
+ int type = le16_to_cpu(msg->hdr.type);
+
+ switch (type) {
+ case CEPH_MSG_MDS_MAP:
+ ceph_mdsc_handle_map(fsc->mdsc, msg);
+ return 0;
+
+ default:
+ return -1;
+ }
+}
+
+/*
+ * create a new fs client
+ */
+static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
+ struct ceph_options *opt)
+{
+ struct ceph_fs_client *fsc;
+ const u64 supported_features =
+ CEPH_FEATURE_FLOCK |
+ CEPH_FEATURE_DIRLAYOUTHASH |
+ CEPH_FEATURE_MDS_INLINE_DATA;
+ const u64 required_features = 0;
+ int page_count;
+ size_t size;
+ int err = -ENOMEM;
+
+ fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
+ if (!fsc)
+ return ERR_PTR(-ENOMEM);
+
+ fsc->client = ceph_create_client(opt, fsc, supported_features,
+ required_features);
+ if (IS_ERR(fsc->client)) {
+ err = PTR_ERR(fsc->client);
+ goto fail;
+ }
+ fsc->client->extra_mon_dispatch = extra_mon_dispatch;
+ fsc->client->monc.want_mdsmap = 1;
+
+ fsc->mount_options = fsopt;
+
+ fsc->sb = NULL;
+ fsc->mount_state = CEPH_MOUNT_MOUNTING;
+
+ atomic_long_set(&fsc->writeback_count, 0);
+
+ err = bdi_init(&fsc->backing_dev_info);
+ if (err < 0)
+ goto fail_client;
+
+ err = -ENOMEM;
+ /*
+ * The number of concurrent works can be high but they don't need
+ * to be processed in parallel, limit concurrency.
+ */
+ fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
+ if (fsc->wb_wq == NULL)
+ goto fail_bdi;
+ fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
+ if (fsc->pg_inv_wq == NULL)
+ goto fail_wb_wq;
+ fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
+ if (fsc->trunc_wq == NULL)
+ goto fail_pg_inv_wq;
+
+ /* set up mempools */
+ err = -ENOMEM;
+ page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT;
+ size = sizeof (struct page *) * (page_count ? page_count : 1);
+ fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
+ if (!fsc->wb_pagevec_pool)
+ goto fail_trunc_wq;
+
+ /* setup fscache */
+ if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
+ (ceph_fscache_register_fs(fsc) != 0))
+ goto fail_fscache;
+
+ /* caps */
+ fsc->min_caps = fsopt->max_readdir;
+
+ return fsc;
+
+fail_fscache:
+ ceph_fscache_unregister_fs(fsc);
+fail_trunc_wq:
+ destroy_workqueue(fsc->trunc_wq);
+fail_pg_inv_wq:
+ destroy_workqueue(fsc->pg_inv_wq);
+fail_wb_wq:
+ destroy_workqueue(fsc->wb_wq);
+fail_bdi:
+ bdi_destroy(&fsc->backing_dev_info);
+fail_client:
+ ceph_destroy_client(fsc->client);
+fail:
+ kfree(fsc);
+ return ERR_PTR(err);
+}
+
+static void destroy_fs_client(struct ceph_fs_client *fsc)
+{
+ dout("destroy_fs_client %p\n", fsc);
+
+ ceph_fscache_unregister_fs(fsc);
+
+ destroy_workqueue(fsc->wb_wq);
+ destroy_workqueue(fsc->pg_inv_wq);
+ destroy_workqueue(fsc->trunc_wq);
+
+ bdi_destroy(&fsc->backing_dev_info);
+
+ mempool_destroy(fsc->wb_pagevec_pool);
+
+ destroy_mount_options(fsc->mount_options);
+
+ ceph_fs_debugfs_cleanup(fsc);
+
+ ceph_destroy_client(fsc->client);
+
+ kfree(fsc);
+ dout("destroy_fs_client %p done\n", fsc);
+}
+
+/*
+ * caches
+ */
+struct kmem_cache *ceph_inode_cachep;
+struct kmem_cache *ceph_cap_cachep;
+struct kmem_cache *ceph_dentry_cachep;
+struct kmem_cache *ceph_file_cachep;
+
+static void ceph_inode_init_once(void *foo)
+{
+ struct ceph_inode_info *ci = foo;
+ inode_init_once(&ci->vfs_inode);
+}
+
+static int __init init_caches(void)
+{
+ int error = -ENOMEM;
+
+ ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
+ sizeof(struct ceph_inode_info),
+ __alignof__(struct ceph_inode_info),
+ (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
+ ceph_inode_init_once);
+ if (ceph_inode_cachep == NULL)
+ return -ENOMEM;
+
+ ceph_cap_cachep = KMEM_CACHE(ceph_cap,
+ SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
+ if (ceph_cap_cachep == NULL)
+ goto bad_cap;
+
+ ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
+ SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
+ if (ceph_dentry_cachep == NULL)
+ goto bad_dentry;
+
+ ceph_file_cachep = KMEM_CACHE(ceph_file_info,
+ SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
+ if (ceph_file_cachep == NULL)
+ goto bad_file;
+
+ if ((error = ceph_fscache_register()))
+ goto bad_file;
+
+ return 0;
+bad_file:
+ kmem_cache_destroy(ceph_dentry_cachep);
+bad_dentry:
+ kmem_cache_destroy(ceph_cap_cachep);
+bad_cap:
+ kmem_cache_destroy(ceph_inode_cachep);
+ return error;
+}
+
+static void destroy_caches(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+
+ kmem_cache_destroy(ceph_inode_cachep);
+ kmem_cache_destroy(ceph_cap_cachep);
+ kmem_cache_destroy(ceph_dentry_cachep);
+ kmem_cache_destroy(ceph_file_cachep);
+
+ ceph_fscache_unregister();
+}
+
+
+/*
+ * ceph_umount_begin - initiate forced umount. Tear down down the
+ * mount, skipping steps that may hang while waiting for server(s).
+ */
+static void ceph_umount_begin(struct super_block *sb)
+{
+ struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
+
+ dout("ceph_umount_begin - starting forced umount\n");
+ if (!fsc)
+ return;
+ fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
+ return;
+}
+
+static const struct super_operations ceph_super_ops = {
+ .alloc_inode = ceph_alloc_inode,
+ .destroy_inode = ceph_destroy_inode,
+ .write_inode = ceph_write_inode,
+ .drop_inode = ceph_drop_inode,
+ .sync_fs = ceph_sync_fs,
+ .put_super = ceph_put_super,
+ .show_options = ceph_show_options,
+ .statfs = ceph_statfs,
+ .umount_begin = ceph_umount_begin,
+};
+
+/*
+ * Bootstrap mount by opening the root directory. Note the mount
+ * @started time from caller, and time out if this takes too long.
+ */
+static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
+ const char *path,
+ unsigned long started)
+{
+ struct ceph_mds_client *mdsc = fsc->mdsc;
+ struct ceph_mds_request *req = NULL;
+ int err;
+ struct dentry *root;
+
+ /* open dir */
+ dout("open_root_inode opening '%s'\n", path);
+ req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
+ if (IS_ERR(req))
+ return ERR_CAST(req);
+ req->r_path1 = kstrdup(path, GFP_NOFS);
+ if (!req->r_path1) {
+ root = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ req->r_ino1.ino = CEPH_INO_ROOT;
+ req->r_ino1.snap = CEPH_NOSNAP;
+ req->r_started = started;
+ req->r_timeout = fsc->client->options->mount_timeout * HZ;
+ req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
+ req->r_num_caps = 2;
+ err = ceph_mdsc_do_request(mdsc, NULL, req);
+ if (err == 0) {
+ struct inode *inode = req->r_target_inode;
+ req->r_target_inode = NULL;
+ dout("open_root_inode success\n");
+ if (ceph_ino(inode) == CEPH_INO_ROOT &&
+ fsc->sb->s_root == NULL) {
+ root = d_make_root(inode);
+ if (!root) {
+ root = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+ } else {
+ root = d_obtain_root(inode);
+ }
+ ceph_init_dentry(root);
+ dout("open_root_inode success, root dentry is %p\n", root);
+ } else {
+ root = ERR_PTR(err);
+ }
+out:
+ ceph_mdsc_put_request(req);
+ return root;
+}
+
+
+
+
+/*
+ * mount: join the ceph cluster, and open root directory.
+ */
+static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
+ const char *path)
+{
+ int err;
+ unsigned long started = jiffies; /* note the start time */
+ struct dentry *root;
+ int first = 0; /* first vfsmount for this super_block */
+
+ dout("mount start\n");
+ mutex_lock(&fsc->client->mount_mutex);
+
+ err = __ceph_open_session(fsc->client, started);
+ if (err < 0)
+ goto out;
+
+ dout("mount opening root\n");
+ root = open_root_dentry(fsc, "", started);
+ if (IS_ERR(root)) {
+ err = PTR_ERR(root);
+ goto out;
+ }
+ if (fsc->sb->s_root) {
+ dput(root);
+ } else {
+ fsc->sb->s_root = root;
+ first = 1;
+
+ err = ceph_fs_debugfs_init(fsc);
+ if (err < 0)
+ goto fail;
+ }
+
+ if (path[0] == 0) {
+ dget(root);
+ } else {
+ dout("mount opening base mountpoint\n");
+ root = open_root_dentry(fsc, path, started);
+ if (IS_ERR(root)) {
+ err = PTR_ERR(root);
+ goto fail;
+ }
+ }
+
+ fsc->mount_state = CEPH_MOUNT_MOUNTED;
+ dout("mount success\n");
+ mutex_unlock(&fsc->client->mount_mutex);
+ return root;
+
+out:
+ mutex_unlock(&fsc->client->mount_mutex);
+ return ERR_PTR(err);
+
+fail:
+ if (first) {
+ dput(fsc->sb->s_root);
+ fsc->sb->s_root = NULL;
+ }
+ goto out;
+}
+
+static int ceph_set_super(struct super_block *s, void *data)
+{
+ struct ceph_fs_client *fsc = data;
+ int ret;
+
+ dout("set_super %p data %p\n", s, data);
+
+ s->s_flags = fsc->mount_options->sb_flags;
+ s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
+
+ s->s_xattr = ceph_xattr_handlers;
+ s->s_fs_info = fsc;
+ fsc->sb = s;
+
+ s->s_op = &ceph_super_ops;
+ s->s_export_op = &ceph_export_ops;
+
+ s->s_time_gran = 1000; /* 1000 ns == 1 us */
+
+ ret = set_anon_super(s, NULL); /* what is that second arg for? */
+ if (ret != 0)
+ goto fail;
+
+ return ret;
+
+fail:
+ s->s_fs_info = NULL;
+ fsc->sb = NULL;
+ return ret;
+}
+
+/*
+ * share superblock if same fs AND options
+ */
+static int ceph_compare_super(struct super_block *sb, void *data)
+{
+ struct ceph_fs_client *new = data;
+ struct ceph_mount_options *fsopt = new->mount_options;
+ struct ceph_options *opt = new->client->options;
+ struct ceph_fs_client *other = ceph_sb_to_client(sb);
+
+ dout("ceph_compare_super %p\n", sb);
+
+ if (compare_mount_options(fsopt, opt, other)) {
+ dout("monitor(s)/mount options don't match\n");
+ return 0;
+ }
+ if ((opt->flags & CEPH_OPT_FSID) &&
+ ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
+ dout("fsid doesn't match\n");
+ return 0;
+ }
+ if (fsopt->sb_flags != other->mount_options->sb_flags) {
+ dout("flags differ\n");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * construct our own bdi so we can control readahead, etc.
+ */
+static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
+
+static int ceph_register_bdi(struct super_block *sb,
+ struct ceph_fs_client *fsc)
+{
+ int err;
+
+ /* set ra_pages based on rasize mount option? */
+ if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
+ fsc->backing_dev_info.ra_pages =
+ (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
+ >> PAGE_SHIFT;
+ else
+ fsc->backing_dev_info.ra_pages =
+ VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE;
+
+ err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
+ atomic_long_inc_return(&bdi_seq));
+ if (!err)
+ sb->s_bdi = &fsc->backing_dev_info;
+ return err;
+}
+
+static struct dentry *ceph_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ struct super_block *sb;
+ struct ceph_fs_client *fsc;
+ struct dentry *res;
+ int err;
+ int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
+ const char *path = NULL;
+ struct ceph_mount_options *fsopt = NULL;
+ struct ceph_options *opt = NULL;
+
+ dout("ceph_mount\n");
+
+#ifdef CONFIG_CEPH_FS_POSIX_ACL
+ flags |= MS_POSIXACL;
+#endif
+ err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
+ if (err < 0) {
+ res = ERR_PTR(err);
+ goto out_final;
+ }
+
+ /* create client (which we may/may not use) */
+ fsc = create_fs_client(fsopt, opt);
+ if (IS_ERR(fsc)) {
+ res = ERR_CAST(fsc);
+ destroy_mount_options(fsopt);
+ ceph_destroy_options(opt);
+ goto out_final;
+ }
+
+ err = ceph_mdsc_init(fsc);
+ if (err < 0) {
+ res = ERR_PTR(err);
+ goto out;
+ }
+
+ if (ceph_test_opt(fsc->client, NOSHARE))
+ compare_super = NULL;
+ sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
+ if (IS_ERR(sb)) {
+ res = ERR_CAST(sb);
+ goto out;
+ }
+
+ if (ceph_sb_to_client(sb) != fsc) {
+ ceph_mdsc_destroy(fsc);
+ destroy_fs_client(fsc);
+ fsc = ceph_sb_to_client(sb);
+ dout("get_sb got existing client %p\n", fsc);
+ } else {
+ dout("get_sb using new client %p\n", fsc);
+ err = ceph_register_bdi(sb, fsc);
+ if (err < 0) {
+ res = ERR_PTR(err);
+ goto out_splat;
+ }
+ }
+
+ res = ceph_real_mount(fsc, path);
+ if (IS_ERR(res))
+ goto out_splat;
+ dout("root %p inode %p ino %llx.%llx\n", res,
+ d_inode(res), ceph_vinop(d_inode(res)));
+ return res;
+
+out_splat:
+ ceph_mdsc_close_sessions(fsc->mdsc);
+ deactivate_locked_super(sb);
+ goto out_final;
+
+out:
+ ceph_mdsc_destroy(fsc);
+ destroy_fs_client(fsc);
+out_final:
+ dout("ceph_mount fail %ld\n", PTR_ERR(res));
+ return res;
+}
+
+static void ceph_kill_sb(struct super_block *s)
+{
+ struct ceph_fs_client *fsc = ceph_sb_to_client(s);
+ dev_t dev = s->s_dev;
+
+ dout("kill_sb %p\n", s);
+
+ ceph_mdsc_pre_umount(fsc->mdsc);
+ generic_shutdown_super(s);
+ ceph_mdsc_destroy(fsc);
+
+ destroy_fs_client(fsc);
+ free_anon_bdev(dev);
+}
+
+static struct file_system_type ceph_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "ceph",
+ .mount = ceph_mount,
+ .kill_sb = ceph_kill_sb,
+ .fs_flags = FS_RENAME_DOES_D_MOVE,
+};
+MODULE_ALIAS_FS("ceph");
+
+static int __init init_ceph(void)
+{
+ int ret = init_caches();
+ if (ret)
+ goto out;
+
+ ceph_flock_init();
+ ceph_xattr_init();
+ ret = ceph_snap_init();
+ if (ret)
+ goto out_xattr;
+ ret = register_filesystem(&ceph_fs_type);
+ if (ret)
+ goto out_snap;
+
+ pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
+
+ return 0;
+
+out_snap:
+ ceph_snap_exit();
+out_xattr:
+ ceph_xattr_exit();
+ destroy_caches();
+out:
+ return ret;
+}
+
+static void __exit exit_ceph(void)
+{
+ dout("exit_ceph\n");
+ unregister_filesystem(&ceph_fs_type);
+ ceph_snap_exit();
+ ceph_xattr_exit();
+ destroy_caches();
+}
+
+module_init(init_ceph);
+module_exit(exit_ceph);
+
+MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
+MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
+MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
+MODULE_DESCRIPTION("Ceph filesystem for Linux");
+MODULE_LICENSE("GPL");