diff options
Diffstat (limited to 'fs/ceph/super.c')
| -rw-r--r-- | fs/ceph/super.c | 1031 |
1 files changed, 1031 insertions, 0 deletions
diff --git a/fs/ceph/super.c b/fs/ceph/super.c new file mode 100644 index 0000000..75d02ea --- /dev/null +++ b/fs/ceph/super.c @@ -0,0 +1,1031 @@ + +#include "ceph_debug.h" + +#include <linux/backing-dev.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/rwsem.h> +#include <linux/sched.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/statfs.h> +#include <linux/string.h> +#include <linux/version.h> +#include <linux/vmalloc.h> + +#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 *cl = ceph_client(s); + + dout("put_super\n"); + ceph_mdsc_close_sessions(&cl->mdsc); + 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 = PATH_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_client(sb)->osdc); + ceph_mdsc_sync(&ceph_client(sb)->mdsc); + dout("sync_fs %d done\n", wait); + return 0; +} + + +/** + * 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, ",fsidmajor=%llu,fsidminor%llu", + le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]), + le64_to_cpu(*(__le64 *)&args->fsid.fsid[8])); + 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 (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=<hidden>"); + 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 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; +} + +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_fsidmajor, + Opt_fsidminor, + Opt_monport, + 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_readdir_max_entries, + Opt_congestion_kb, + Opt_last_int, + /* int args above */ + 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_fsidmajor, "fsidmajor=%ld"}, + {Opt_fsidminor, "fsidminor=%ld"}, + {Opt_monport, "monport=%d"}, + {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_readdir_max_entries, "readdir_max_entries=%d"}, + {Opt_congestion_kb, "write_congestion_kb=%d"}, + /* int args above */ + {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 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_CAPS_PER_RELEASE * 4; + args->max_readdir = 1024; + 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_fsidmajor: + *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval); + break; + case Opt_fsidminor: + *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval); + break; + 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_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_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; + ceph_adjust_min_caps(client->min_caps); + + /* 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_monc_stop(&client->monc); + ceph_osdc_stop(&client->osdc); + + ceph_adjust_min_caps(-client->min_caps); + + ceph_debugfs_client_cleanup(client); + destroy_workqueue(client->wb_wq); + destroy_workqueue(client->pg_inv_wq); + destroy_workqueue(client->trunc_wq); + + 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 " FSID_FORMAT " got " FSID_FORMAT, + PR_FSID(&client->fsid), PR_FSID(fsid)); + return -1; + } + } else { + pr_info("client%lld fsid " FSID_FORMAT "\n", + client->monc.auth->global_id, PR_FSID(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_map(struct ceph_client *client) +{ + return client->monc.monmap && client->monc.monmap->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_PTR(PTR_ERR(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_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_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 int ceph_register_bdi(struct super_block *sb, struct ceph_client *client) +{ + int err; + + sb->s_bdi = &client->backing_dev_info; + + /* 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_dev(&client->backing_dev_info, sb->s_dev); + 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_client(sb) != client) { + ceph_destroy_client(client); + client = ceph_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); + up_write(&sb->s_umount); + deactivate_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 */ + if (s->s_bdi == &client->backing_dev_info) + bdi_unregister(&client->backing_dev_info); + bdi_destroy(&client->backing_dev_info); + 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; + + ceph_caps_init(); + + ret = register_filesystem(&ceph_fs_type); + if (ret) + goto out_icache; + + pr_info("loaded %d.%d.%d (mon/mds/osd proto %d/%d/%d)\n", + CEPH_VERSION_MAJOR, CEPH_VERSION_MINOR, CEPH_VERSION_PATCH, + CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL); + 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); + ceph_caps_finalize(); + destroy_caches(); + ceph_msgr_exit(); + ceph_debugfs_cleanup(); +} + +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"); |
