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super.c
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#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, Opt_poolperm, Opt_nopoolperm, #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"}, {Opt_poolperm, "poolperm"}, {Opt_nopoolperm, "nopoolperm"}, #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; case Opt_poolperm: fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM; printk ("pool perm"); break; case Opt_nopoolperm: fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM; 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"); if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM) seq_puts(m, ",nopoolperm"); #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_show_option(m, "snapdirname", 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_cap_flush_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| SLAB_ACCOUNT, 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_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); if (ceph_cap_flush_cachep == NULL) goto bad_cap_flush; 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_flush_cachep); bad_cap_flush: 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_cap_flush_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; ceph_mdsc_force_umount(fsc->mdsc); 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; 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");
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