diff options
Diffstat (limited to 'kernel/fs/ceph/super.c')
| -rw-r--r-- | kernel/fs/ceph/super.c | 1059 |
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"); |