#include "ceph_debug.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include "decode.h" #include "super.h" #include "mon_client.h" #include "auth.h" /* * Ceph superblock operations * * Handle the basics of mounting, unmounting. */ /* * find filename portion of a path (/foo/bar/baz -> baz) */ const char *ceph_file_part(const char *s, int len) { const char *e = s + len; while (e != s && *(e-1) != '/') e--; return e; } /* * super ops */ static void ceph_put_super(struct super_block *s) { struct ceph_client *client = ceph_sb_to_client(s); dout("put_super\n"); ceph_mdsc_close_sessions(&client->mdsc); /* * ensure we release the bdi before put_anon_super releases * the device name. */ if (s->s_bdi == &client->backing_dev_info) { bdi_unregister(&client->backing_dev_info); s->s_bdi = NULL; } return; } static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) { struct ceph_client *client = ceph_inode_to_client(dentry->d_inode); struct ceph_monmap *monmap = client->monc.monmap; struct ceph_statfs st; u64 fsid; int err; dout("statfs\n"); err = ceph_monc_do_statfs(&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. */ buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >> (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; buf->f_frsize = PAGE_CACHE_SIZE; /* 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_syncfs(struct super_block *sb, int wait) { dout("sync_fs %d\n", wait); ceph_osdc_sync(&ceph_sb_to_client(sb)->osdc); ceph_mdsc_sync(&ceph_sb_to_client(sb)->mdsc); dout("sync_fs %d done\n", wait); return 0; } static int default_congestion_kb(void) { int congestion_kb; /* * Copied from NFS * * congestion size, scale with available memory. * * 64MB: 8192k * 128MB: 11585k * 256MB: 16384k * 512MB: 23170k * 1GB: 32768k * 2GB: 46340k * 4GB: 65536k * 8GB: 92681k * 16GB: 131072k * * This allows larger machines to have larger/more transfers. * Limit the default to 256M */ congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); if (congestion_kb > 256*1024) congestion_kb = 256*1024; return congestion_kb; } /** * ceph_show_options - Show mount options in /proc/mounts * @m: seq_file to write to * @mnt: mount descriptor */ static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt) { struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb); struct ceph_mount_args *args = client->mount_args; if (args->flags & CEPH_OPT_FSID) seq_printf(m, ",fsid=%pU", &args->fsid); if (args->flags & CEPH_OPT_NOSHARE) seq_puts(m, ",noshare"); if (args->flags & CEPH_OPT_DIRSTAT) seq_puts(m, ",dirstat"); if ((args->flags & CEPH_OPT_RBYTES) == 0) seq_puts(m, ",norbytes"); if (args->flags & CEPH_OPT_NOCRC) seq_puts(m, ",nocrc"); if (args->flags & CEPH_OPT_NOASYNCREADDIR) seq_puts(m, ",noasyncreaddir"); if (args->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) seq_printf(m, ",mount_timeout=%d", args->mount_timeout); if (args->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) seq_printf(m, ",osd_idle_ttl=%d", args->osd_idle_ttl); if (args->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT) seq_printf(m, ",osdtimeout=%d", args->osd_timeout); if (args->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) seq_printf(m, ",osdkeepalivetimeout=%d", args->osd_keepalive_timeout); if (args->wsize) seq_printf(m, ",wsize=%d", args->wsize); if (args->rsize != CEPH_MOUNT_RSIZE_DEFAULT) seq_printf(m, ",rsize=%d", args->rsize); if (args->congestion_kb != default_congestion_kb()) seq_printf(m, ",write_congestion_kb=%d", args->congestion_kb); if (args->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) seq_printf(m, ",caps_wanted_delay_min=%d", args->caps_wanted_delay_min); if (args->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) seq_printf(m, ",caps_wanted_delay_max=%d", args->caps_wanted_delay_max); if (args->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) seq_printf(m, ",cap_release_safety=%d", args->cap_release_safety); if (args->max_readdir != CEPH_MAX_READDIR_DEFAULT) seq_printf(m, ",readdir_max_entries=%d", args->max_readdir); if (args->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) seq_printf(m, ",readdir_max_bytes=%d", args->max_readdir_bytes); if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) seq_printf(m, ",snapdirname=%s", args->snapdir_name); if (args->name) seq_printf(m, ",name=%s", args->name); if (args->secret) seq_puts(m, ",secret="); return 0; } /* * 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) { 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; 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 -ENOMEM; } static void destroy_caches(void) { 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_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_client *client = ceph_sb_to_client(sb); dout("ceph_umount_begin - starting forced umount\n"); if (!client) return; client->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, .sync_fs = ceph_syncfs, .put_super = ceph_put_super, .show_options = ceph_show_options, .statfs = ceph_statfs, .umount_begin = ceph_umount_begin, }; const char *ceph_msg_type_name(int type) { switch (type) { case CEPH_MSG_SHUTDOWN: return "shutdown"; case CEPH_MSG_PING: return "ping"; case CEPH_MSG_AUTH: return "auth"; case CEPH_MSG_AUTH_REPLY: return "auth_reply"; case CEPH_MSG_MON_MAP: return "mon_map"; case CEPH_MSG_MON_GET_MAP: return "mon_get_map"; case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe"; case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack"; case CEPH_MSG_STATFS: return "statfs"; case CEPH_MSG_STATFS_REPLY: return "statfs_reply"; case CEPH_MSG_MDS_MAP: return "mds_map"; case CEPH_MSG_CLIENT_SESSION: return "client_session"; case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect"; case CEPH_MSG_CLIENT_REQUEST: return "client_request"; case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward"; case CEPH_MSG_CLIENT_REPLY: return "client_reply"; case CEPH_MSG_CLIENT_CAPS: return "client_caps"; case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release"; case CEPH_MSG_CLIENT_SNAP: return "client_snap"; case CEPH_MSG_CLIENT_LEASE: return "client_lease"; case CEPH_MSG_OSD_MAP: return "osd_map"; case CEPH_MSG_OSD_OP: return "osd_op"; case CEPH_MSG_OSD_OPREPLY: return "osd_opreply"; default: return "unknown"; } } /* * mount options */ enum { Opt_wsize, Opt_rsize, Opt_osdtimeout, Opt_osdkeepalivetimeout, Opt_mount_timeout, Opt_osd_idle_ttl, 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_fsid, Opt_snapdirname, Opt_name, Opt_secret, Opt_last_string, /* string args above */ Opt_ip, Opt_noshare, Opt_dirstat, Opt_nodirstat, Opt_rbytes, Opt_norbytes, Opt_nocrc, Opt_noasyncreaddir, }; static match_table_t arg_tokens = { {Opt_wsize, "wsize=%d"}, {Opt_rsize, "rsize=%d"}, {Opt_osdtimeout, "osdtimeout=%d"}, {Opt_osdkeepalivetimeout, "osdkeepalive=%d"}, {Opt_mount_timeout, "mount_timeout=%d"}, {Opt_osd_idle_ttl, "osd_idle_ttl=%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_fsid, "fsid=%s"}, {Opt_snapdirname, "snapdirname=%s"}, {Opt_name, "name=%s"}, {Opt_secret, "secret=%s"}, /* string args above */ {Opt_ip, "ip=%s"}, {Opt_noshare, "noshare"}, {Opt_dirstat, "dirstat"}, {Opt_nodirstat, "nodirstat"}, {Opt_rbytes, "rbytes"}, {Opt_norbytes, "norbytes"}, {Opt_nocrc, "nocrc"}, {Opt_noasyncreaddir, "noasyncreaddir"}, {-1, NULL} }; static int parse_fsid(const char *str, struct ceph_fsid *fsid) { int i = 0; char tmp[3]; int err = -EINVAL; int d; dout("parse_fsid '%s'\n", str); tmp[2] = 0; while (*str && i < 16) { if (ispunct(*str)) { str++; continue; } if (!isxdigit(str[0]) || !isxdigit(str[1])) break; tmp[0] = str[0]; tmp[1] = str[1]; if (sscanf(tmp, "%x", &d) < 1) break; fsid->fsid[i] = d & 0xff; i++; str += 2; } if (i == 16) err = 0; dout("parse_fsid ret %d got fsid %pU", err, fsid); return err; } static struct ceph_mount_args *parse_mount_args(int flags, char *options, const char *dev_name, const char **path) { struct ceph_mount_args *args; const char *c; int err = -ENOMEM; substring_t argstr[MAX_OPT_ARGS]; args = kzalloc(sizeof(*args), GFP_KERNEL); if (!args) return ERR_PTR(-ENOMEM); args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr), GFP_KERNEL); if (!args->mon_addr) goto out; dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name); /* start with defaults */ args->sb_flags = flags; args->flags = CEPH_OPT_DEFAULT; args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT; args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT; args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */ args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */ args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; args->rsize = CEPH_MOUNT_RSIZE_DEFAULT; args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); args->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; args->max_readdir = CEPH_MAX_READDIR_DEFAULT; args->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; args->congestion_kb = default_congestion_kb(); /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */ err = -EINVAL; if (!dev_name) goto out; *path = strstr(dev_name, ":/"); if (*path == NULL) { pr_err("device name is missing path (no :/ in %s)\n", dev_name); goto out; } /* get mon ip(s) */ err = ceph_parse_ips(dev_name, *path, args->mon_addr, CEPH_MAX_MON, &args->num_mon); if (err < 0) goto out; /* path on server */ *path += 2; dout("server path '%s'\n", *path); /* parse mount options */ while ((c = strsep(&options, ",")) != NULL) { int token, intval, ret; if (!*c) continue; err = -EINVAL; token = match_token((char *)c, arg_tokens, argstr); if (token < 0) { pr_err("bad mount option at '%s'\n", c); goto out; } 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); continue; } 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_ip: err = ceph_parse_ips(argstr[0].from, argstr[0].to, &args->my_addr, 1, NULL); if (err < 0) goto out; args->flags |= CEPH_OPT_MYIP; break; case Opt_fsid: err = parse_fsid(argstr[0].from, &args->fsid); if (err == 0) args->flags |= CEPH_OPT_FSID; break; case Opt_snapdirname: kfree(args->snapdir_name); args->snapdir_name = kstrndup(argstr[0].from, argstr[0].to-argstr[0].from, GFP_KERNEL); break; case Opt_name: args->name = kstrndup(argstr[0].from, argstr[0].to-argstr[0].from, GFP_KERNEL); break; case Opt_secret: args->secret = kstrndup(argstr[0].from, argstr[0].to-argstr[0].from, GFP_KERNEL); break; /* misc */ case Opt_wsize: args->wsize = intval; break; case Opt_rsize: args->rsize = intval; break; case Opt_osdtimeout: args->osd_timeout = intval; break; case Opt_osdkeepalivetimeout: args->osd_keepalive_timeout = intval; break; case Opt_mount_timeout: args->mount_timeout = intval; break; case Opt_caps_wanted_delay_min: args->caps_wanted_delay_min = intval; break; case Opt_caps_wanted_delay_max: args->caps_wanted_delay_max = intval; break; case Opt_readdir_max_entries: args->max_readdir = intval; break; case Opt_readdir_max_bytes: args->max_readdir_bytes = intval; break; case Opt_congestion_kb: args->congestion_kb = intval; break; case Opt_noshare: args->flags |= CEPH_OPT_NOSHARE; break; case Opt_dirstat: args->flags |= CEPH_OPT_DIRSTAT; break; case Opt_nodirstat: args->flags &= ~CEPH_OPT_DIRSTAT; break; case Opt_rbytes: args->flags |= CEPH_OPT_RBYTES; break; case Opt_norbytes: args->flags &= ~CEPH_OPT_RBYTES; break; case Opt_nocrc: args->flags |= CEPH_OPT_NOCRC; break; case Opt_noasyncreaddir: args->flags |= CEPH_OPT_NOASYNCREADDIR; break; default: BUG_ON(token); } } return args; out: kfree(args->mon_addr); kfree(args); return ERR_PTR(err); } static void destroy_mount_args(struct ceph_mount_args *args) { dout("destroy_mount_args %p\n", args); kfree(args->snapdir_name); args->snapdir_name = NULL; kfree(args->name); args->name = NULL; kfree(args->secret); args->secret = NULL; kfree(args); } /* * create a fresh client instance */ static struct ceph_client *ceph_create_client(struct ceph_mount_args *args) { struct ceph_client *client; int err = -ENOMEM; client = kzalloc(sizeof(*client), GFP_KERNEL); if (client == NULL) return ERR_PTR(-ENOMEM); mutex_init(&client->mount_mutex); init_waitqueue_head(&client->auth_wq); client->sb = NULL; client->mount_state = CEPH_MOUNT_MOUNTING; client->mount_args = args; client->msgr = NULL; client->auth_err = 0; atomic_long_set(&client->writeback_count, 0); err = bdi_init(&client->backing_dev_info); if (err < 0) goto fail; err = -ENOMEM; client->wb_wq = create_workqueue("ceph-writeback"); if (client->wb_wq == NULL) goto fail_bdi; client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid"); if (client->pg_inv_wq == NULL) goto fail_wb_wq; client->trunc_wq = create_singlethread_workqueue("ceph-trunc"); if (client->trunc_wq == NULL) goto fail_pg_inv_wq; /* set up mempools */ err = -ENOMEM; client->wb_pagevec_pool = mempool_create_kmalloc_pool(10, client->mount_args->wsize >> PAGE_CACHE_SHIFT); if (!client->wb_pagevec_pool) goto fail_trunc_wq; /* caps */ client->min_caps = args->max_readdir; /* subsystems */ err = ceph_monc_init(&client->monc, client); if (err < 0) goto fail_mempool; err = ceph_osdc_init(&client->osdc, client); if (err < 0) goto fail_monc; err = ceph_mdsc_init(&client->mdsc, client); if (err < 0) goto fail_osdc; return client; fail_osdc: ceph_osdc_stop(&client->osdc); fail_monc: ceph_monc_stop(&client->monc); fail_mempool: mempool_destroy(client->wb_pagevec_pool); fail_trunc_wq: destroy_workqueue(client->trunc_wq); fail_pg_inv_wq: destroy_workqueue(client->pg_inv_wq); fail_wb_wq: destroy_workqueue(client->wb_wq); fail_bdi: bdi_destroy(&client->backing_dev_info); fail: kfree(client); return ERR_PTR(err); } static void ceph_destroy_client(struct ceph_client *client) { dout("destroy_client %p\n", client); /* unmount */ ceph_mdsc_stop(&client->mdsc); ceph_osdc_stop(&client->osdc); /* * make sure mds and osd connections close out before destroying * the auth module, which is needed to free those connections' * ceph_authorizers. */ ceph_msgr_flush(); ceph_monc_stop(&client->monc); ceph_debugfs_client_cleanup(client); destroy_workqueue(client->wb_wq); destroy_workqueue(client->pg_inv_wq); destroy_workqueue(client->trunc_wq); bdi_destroy(&client->backing_dev_info); if (client->msgr) ceph_messenger_destroy(client->msgr); mempool_destroy(client->wb_pagevec_pool); destroy_mount_args(client->mount_args); kfree(client); dout("destroy_client %p done\n", client); } /* * Initially learn our fsid, or verify an fsid matches. */ int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid) { if (client->have_fsid) { if (ceph_fsid_compare(&client->fsid, fsid)) { pr_err("bad fsid, had %pU got %pU", &client->fsid, fsid); return -1; } } else { pr_info("client%lld fsid %pU\n", client->monc.auth->global_id, fsid); memcpy(&client->fsid, fsid, sizeof(*fsid)); ceph_debugfs_client_init(client); client->have_fsid = true; } return 0; } /* * true if we have the mon map (and have thus joined the cluster) */ static int have_mon_and_osd_map(struct ceph_client *client) { return client->monc.monmap && client->monc.monmap->epoch && client->osdc.osdmap && client->osdc.osdmap->epoch; } /* * 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_client *client, const char *path, unsigned long started) { struct ceph_mds_client *mdsc = &client->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); req->r_ino1.ino = CEPH_INO_ROOT; req->r_ino1.snap = CEPH_NOSNAP; req->r_started = started; req->r_timeout = client->mount_args->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) { dout("open_root_inode success\n"); if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT && client->sb->s_root == NULL) root = d_alloc_root(req->r_target_inode); else root = d_obtain_alias(req->r_target_inode); req->r_target_inode = NULL; dout("open_root_inode success, root dentry is %p\n", root); } else { root = ERR_PTR(err); } ceph_mdsc_put_request(req); return root; } /* * mount: join the ceph cluster, and open root directory. */ static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt, const char *path) { struct ceph_entity_addr *myaddr = NULL; int err; unsigned long timeout = client->mount_args->mount_timeout * HZ; unsigned long started = jiffies; /* note the start time */ struct dentry *root; dout("mount start\n"); mutex_lock(&client->mount_mutex); /* initialize the messenger */ if (client->msgr == NULL) { if (ceph_test_opt(client, MYIP)) myaddr = &client->mount_args->my_addr; client->msgr = ceph_messenger_create(myaddr); if (IS_ERR(client->msgr)) { err = PTR_ERR(client->msgr); client->msgr = NULL; goto out; } client->msgr->nocrc = ceph_test_opt(client, NOCRC); } /* open session, and wait for mon, mds, and osd maps */ err = ceph_monc_open_session(&client->monc); if (err < 0) goto out; while (!have_mon_and_osd_map(client)) { err = -EIO; if (timeout && time_after_eq(jiffies, started + timeout)) goto out; /* wait */ dout("mount waiting for mon_map\n"); err = wait_event_interruptible_timeout(client->auth_wq, have_mon_and_osd_map(client) || (client->auth_err < 0), timeout); if (err == -EINTR || err == -ERESTARTSYS) goto out; if (client->auth_err < 0) { err = client->auth_err; goto out; } } dout("mount opening root\n"); root = open_root_dentry(client, "", started); if (IS_ERR(root)) { err = PTR_ERR(root); goto out; } if (client->sb->s_root) dput(root); else client->sb->s_root = root; if (path[0] == 0) { dget(root); } else { dout("mount opening base mountpoint\n"); root = open_root_dentry(client, path, started); if (IS_ERR(root)) { err = PTR_ERR(root); dput(client->sb->s_root); client->sb->s_root = NULL; goto out; } } mnt->mnt_root = root; mnt->mnt_sb = client->sb; client->mount_state = CEPH_MOUNT_MOUNTED; dout("mount success\n"); err = 0; out: mutex_unlock(&client->mount_mutex); return err; } static int ceph_set_super(struct super_block *s, void *data) { struct ceph_client *client = data; int ret; dout("set_super %p data %p\n", s, data); s->s_flags = client->mount_args->sb_flags; s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ s->s_fs_info = client; client->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; client->sb = NULL; return ret; } /* * share superblock if same fs AND options */ static int ceph_compare_super(struct super_block *sb, void *data) { struct ceph_client *new = data; struct ceph_mount_args *args = new->mount_args; struct ceph_client *other = ceph_sb_to_client(sb); int i; dout("ceph_compare_super %p\n", sb); if (args->flags & CEPH_OPT_FSID) { if (ceph_fsid_compare(&args->fsid, &other->fsid)) { dout("fsid doesn't match\n"); return 0; } } else { /* do we share (a) monitor? */ for (i = 0; i < new->monc.monmap->num_mon; i++) if (ceph_monmap_contains(other->monc.monmap, &new->monc.monmap->mon_inst[i].addr)) break; if (i == new->monc.monmap->num_mon) { dout("mon ip not part of monmap\n"); return 0; } dout("mon ip matches existing sb %p\n", sb); } if (args->sb_flags != other->mount_args->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_client *client) { int err; /* set ra_pages based on rsize mount option? */ if (client->mount_args->rsize >= PAGE_CACHE_SIZE) client->backing_dev_info.ra_pages = (client->mount_args->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_SHIFT; err = bdi_register(&client->backing_dev_info, NULL, "ceph-%d", atomic_long_inc_return(&bdi_seq)); if (!err) sb->s_bdi = &client->backing_dev_info; return err; } static int ceph_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) { struct super_block *sb; struct ceph_client *client; int err; int (*compare_super)(struct super_block *, void *) = ceph_compare_super; const char *path = NULL; struct ceph_mount_args *args; dout("ceph_get_sb\n"); args = parse_mount_args(flags, data, dev_name, &path); if (IS_ERR(args)) { err = PTR_ERR(args); goto out_final; } /* create client (which we may/may not use) */ client = ceph_create_client(args); if (IS_ERR(client)) { err = PTR_ERR(client); goto out_final; } if (client->mount_args->flags & CEPH_OPT_NOSHARE) compare_super = NULL; sb = sget(fs_type, compare_super, ceph_set_super, client); if (IS_ERR(sb)) { err = PTR_ERR(sb); goto out; } if (ceph_sb_to_client(sb) != client) { ceph_destroy_client(client); client = ceph_sb_to_client(sb); dout("get_sb got existing client %p\n", client); } else { dout("get_sb using new client %p\n", client); err = ceph_register_bdi(sb, client); if (err < 0) goto out_splat; } err = ceph_mount(client, mnt, path); if (err < 0) goto out_splat; dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root, mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode)); return 0; out_splat: ceph_mdsc_close_sessions(&client->mdsc); deactivate_locked_super(sb); goto out_final; out: ceph_destroy_client(client); out_final: dout("ceph_get_sb fail %d\n", err); return err; } static void ceph_kill_sb(struct super_block *s) { struct ceph_client *client = ceph_sb_to_client(s); dout("kill_sb %p\n", s); ceph_mdsc_pre_umount(&client->mdsc); kill_anon_super(s); /* will call put_super after sb is r/o */ ceph_destroy_client(client); } static struct file_system_type ceph_fs_type = { .owner = THIS_MODULE, .name = "ceph", .get_sb = ceph_get_sb, .kill_sb = ceph_kill_sb, .fs_flags = FS_RENAME_DOES_D_MOVE, }; #define _STRINGIFY(x) #x #define STRINGIFY(x) _STRINGIFY(x) static int __init init_ceph(void) { int ret = 0; ret = ceph_debugfs_init(); if (ret < 0) goto out; ret = ceph_msgr_init(); if (ret < 0) goto out_debugfs; ret = init_caches(); if (ret) goto out_msgr; ret = register_filesystem(&ceph_fs_type); if (ret) goto out_icache; pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n", CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL, CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT, CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT); return 0; out_icache: destroy_caches(); out_msgr: ceph_msgr_exit(); out_debugfs: ceph_debugfs_cleanup(); out: return ret; } static void __exit exit_ceph(void) { dout("exit_ceph\n"); unregister_filesystem(&ceph_fs_type); destroy_caches(); ceph_msgr_exit(); ceph_debugfs_cleanup(); } module_init(init_ceph); module_exit(exit_ceph); MODULE_AUTHOR("Sage Weil "); MODULE_AUTHOR("Yehuda Sadeh "); MODULE_AUTHOR("Patience Warnick "); MODULE_DESCRIPTION("Ceph filesystem for Linux"); MODULE_LICENSE("GPL");