| |
| #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)) |
| seq_puts(m, ",rbytes"); |
| 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; |
| ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 0, true); |
| |
| 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_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 %p\n", fsc); |
| mutex_lock(&fsc->client->mount_mutex); |
| |
| if (!fsc->sb->s_root) { |
| 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; |
| } |
| fsc->sb->s_root = root; |
| first = 1; |
| |
| err = ceph_fs_debugfs_init(fsc); |
| if (err < 0) |
| goto fail; |
| } |
| |
| if (path[0] == 0) { |
| root = fsc->sb->s_root; |
| 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; |
| |
| fail: |
| if (first) { |
| dput(fsc->sb->s_root); |
| fsc->sb->s_root = NULL; |
| } |
| out: |
| mutex_unlock(&fsc->client->mount_mutex); |
| return ERR_PTR(err); |
| } |
| |
| 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_SIZE) |
| fsc->backing_dev_info.ra_pages = |
| (fsc->mount_options->rasize + PAGE_SIZE - 1) |
| >> PAGE_SHIFT; |
| else |
| fsc->backing_dev_info.ra_pages = |
| VM_MAX_READAHEAD * 1024 / PAGE_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 = register_filesystem(&ceph_fs_type); |
| if (ret) |
| goto out_xattr; |
| |
| pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); |
| |
| return 0; |
| |
| 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_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"); |