2 #include <linux/ceph/ceph_debug.h>
4 #include <linux/backing-dev.h>
5 #include <linux/ctype.h>
7 #include <linux/inet.h>
9 #include <linux/module.h>
10 #include <linux/mount.h>
11 #include <linux/parser.h>
12 #include <linux/sched.h>
13 #include <linux/seq_file.h>
14 #include <linux/slab.h>
15 #include <linux/statfs.h>
16 #include <linux/string.h>
19 #include "mds_client.h"
22 #include <linux/ceph/ceph_features.h>
23 #include <linux/ceph/decode.h>
24 #include <linux/ceph/mon_client.h>
25 #include <linux/ceph/auth.h>
26 #include <linux/ceph/debugfs.h>
29 * Ceph superblock operations
31 * Handle the basics of mounting, unmounting.
37 static void ceph_put_super(struct super_block *s)
39 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
42 ceph_mdsc_close_sessions(fsc->mdsc);
45 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
47 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
48 struct ceph_monmap *monmap = fsc->client->monc.monmap;
49 struct ceph_statfs st;
54 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
59 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
62 * express utilization in terms of large blocks to avoid
63 * overflow on 32-bit machines.
65 * NOTE: for the time being, we make bsize == frsize to humor
66 * not-yet-ancient versions of glibc that are broken.
67 * Someday, we will probably want to report a real block
68 * size... whatever that may mean for a network file system!
70 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
71 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
72 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
73 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
74 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
76 buf->f_files = le64_to_cpu(st.num_objects);
78 buf->f_namelen = NAME_MAX;
80 /* leave fsid little-endian, regardless of host endianness */
81 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
82 buf->f_fsid.val[0] = fsid & 0xffffffff;
83 buf->f_fsid.val[1] = fsid >> 32;
89 static int ceph_sync_fs(struct super_block *sb, int wait)
91 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
94 dout("sync_fs (non-blocking)\n");
95 ceph_flush_dirty_caps(fsc->mdsc);
96 dout("sync_fs (non-blocking) done\n");
100 dout("sync_fs (blocking)\n");
101 ceph_osdc_sync(&fsc->client->osdc);
102 ceph_mdsc_sync(fsc->mdsc);
103 dout("sync_fs (blocking) done\n");
114 Opt_caps_wanted_delay_min,
115 Opt_caps_wanted_delay_max,
116 Opt_cap_release_safety,
117 Opt_readdir_max_entries,
118 Opt_readdir_max_bytes,
124 /* string args above */
137 #ifdef CONFIG_CEPH_FS_POSIX_ACL
143 static match_table_t fsopt_tokens = {
144 {Opt_wsize, "wsize=%d"},
145 {Opt_rsize, "rsize=%d"},
146 {Opt_rasize, "rasize=%d"},
147 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
148 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
149 {Opt_cap_release_safety, "cap_release_safety=%d"},
150 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
151 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
152 {Opt_congestion_kb, "write_congestion_kb=%d"},
154 {Opt_snapdirname, "snapdirname=%s"},
155 /* string args above */
156 {Opt_dirstat, "dirstat"},
157 {Opt_nodirstat, "nodirstat"},
158 {Opt_rbytes, "rbytes"},
159 {Opt_norbytes, "norbytes"},
160 {Opt_asyncreaddir, "asyncreaddir"},
161 {Opt_noasyncreaddir, "noasyncreaddir"},
162 {Opt_dcache, "dcache"},
163 {Opt_nodcache, "nodcache"},
164 {Opt_ino32, "ino32"},
165 {Opt_noino32, "noino32"},
166 {Opt_fscache, "fsc"},
167 {Opt_nofscache, "nofsc"},
168 #ifdef CONFIG_CEPH_FS_POSIX_ACL
171 {Opt_noacl, "noacl"},
175 static int parse_fsopt_token(char *c, void *private)
177 struct ceph_mount_options *fsopt = private;
178 substring_t argstr[MAX_OPT_ARGS];
179 int token, intval, ret;
181 token = match_token((char *)c, fsopt_tokens, argstr);
185 if (token < Opt_last_int) {
186 ret = match_int(&argstr[0], &intval);
188 pr_err("bad mount option arg (not int) "
192 dout("got int token %d val %d\n", token, intval);
193 } else if (token > Opt_last_int && token < Opt_last_string) {
194 dout("got string token %d val %s\n", token,
197 dout("got token %d\n", token);
201 case Opt_snapdirname:
202 kfree(fsopt->snapdir_name);
203 fsopt->snapdir_name = kstrndup(argstr[0].from,
204 argstr[0].to-argstr[0].from,
206 if (!fsopt->snapdir_name)
212 fsopt->wsize = intval;
215 fsopt->rsize = intval;
218 fsopt->rasize = intval;
220 case Opt_caps_wanted_delay_min:
221 fsopt->caps_wanted_delay_min = intval;
223 case Opt_caps_wanted_delay_max:
224 fsopt->caps_wanted_delay_max = intval;
226 case Opt_readdir_max_entries:
227 fsopt->max_readdir = intval;
229 case Opt_readdir_max_bytes:
230 fsopt->max_readdir_bytes = intval;
232 case Opt_congestion_kb:
233 fsopt->congestion_kb = intval;
236 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
239 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
242 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
245 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
247 case Opt_asyncreaddir:
248 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
250 case Opt_noasyncreaddir:
251 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
254 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
257 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
260 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
263 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
266 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
269 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
271 #ifdef CONFIG_CEPH_FS_POSIX_ACL
273 fsopt->sb_flags |= MS_POSIXACL;
277 fsopt->sb_flags &= ~MS_POSIXACL;
285 static void destroy_mount_options(struct ceph_mount_options *args)
287 dout("destroy_mount_options %p\n", args);
288 kfree(args->snapdir_name);
292 static int strcmp_null(const char *s1, const char *s2)
300 return strcmp(s1, s2);
303 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
304 struct ceph_options *new_opt,
305 struct ceph_fs_client *fsc)
307 struct ceph_mount_options *fsopt1 = new_fsopt;
308 struct ceph_mount_options *fsopt2 = fsc->mount_options;
309 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
312 ret = memcmp(fsopt1, fsopt2, ofs);
316 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
320 return ceph_compare_options(new_opt, fsc->client);
323 static int parse_mount_options(struct ceph_mount_options **pfsopt,
324 struct ceph_options **popt,
325 int flags, char *options,
326 const char *dev_name,
329 struct ceph_mount_options *fsopt;
330 const char *dev_name_end;
333 if (!dev_name || !*dev_name)
336 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
340 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
342 fsopt->sb_flags = flags;
343 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
345 fsopt->rsize = CEPH_RSIZE_DEFAULT;
346 fsopt->rasize = CEPH_RASIZE_DEFAULT;
347 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
348 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
349 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
350 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
351 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
352 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
353 fsopt->congestion_kb = default_congestion_kb();
356 * Distinguish the server list from the path in "dev_name".
357 * Internally we do not include the leading '/' in the path.
359 * "dev_name" will look like:
360 * <server_spec>[,<server_spec>...]:[<path>]
362 * <server_spec> is <ip>[:<port>]
363 * <path> is optional, but if present must begin with '/'
365 dev_name_end = strchr(dev_name, '/');
367 /* skip over leading '/' for path */
368 *path = dev_name_end + 1;
371 dev_name_end = dev_name + strlen(dev_name);
372 *path = dev_name_end;
375 dev_name_end--; /* back up to ':' separator */
376 if (dev_name_end < dev_name || *dev_name_end != ':') {
377 pr_err("device name is missing path (no : separator in %s)\n",
381 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
382 dout("server path '%s'\n", *path);
384 *popt = ceph_parse_options(options, dev_name, dev_name_end,
385 parse_fsopt_token, (void *)fsopt);
387 err = PTR_ERR(*popt);
396 destroy_mount_options(fsopt);
401 * ceph_show_options - Show mount options in /proc/mounts
402 * @m: seq_file to write to
403 * @root: root of that (sub)tree
405 static int ceph_show_options(struct seq_file *m, struct dentry *root)
407 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
408 struct ceph_mount_options *fsopt = fsc->mount_options;
409 struct ceph_options *opt = fsc->client->options;
411 if (opt->flags & CEPH_OPT_FSID)
412 seq_printf(m, ",fsid=%pU", &opt->fsid);
413 if (opt->flags & CEPH_OPT_NOSHARE)
414 seq_puts(m, ",noshare");
415 if (opt->flags & CEPH_OPT_NOCRC)
416 seq_puts(m, ",nocrc");
417 if (opt->flags & CEPH_OPT_NOMSGAUTH)
418 seq_puts(m, ",nocephx_require_signatures");
419 if ((opt->flags & CEPH_OPT_TCP_NODELAY) == 0)
420 seq_puts(m, ",notcp_nodelay");
423 seq_printf(m, ",name=%s", opt->name);
425 seq_puts(m, ",secret=<hidden>");
427 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
428 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
429 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
430 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
431 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
432 seq_printf(m, ",osdkeepalivetimeout=%d",
433 opt->osd_keepalive_timeout);
435 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
436 seq_puts(m, ",dirstat");
437 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
438 seq_puts(m, ",norbytes");
439 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
440 seq_puts(m, ",noasyncreaddir");
441 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
442 seq_puts(m, ",dcache");
444 seq_puts(m, ",nodcache");
445 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
448 seq_puts(m, ",nofsc");
450 #ifdef CONFIG_CEPH_FS_POSIX_ACL
451 if (fsopt->sb_flags & MS_POSIXACL)
454 seq_puts(m, ",noacl");
458 seq_printf(m, ",wsize=%d", fsopt->wsize);
459 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
460 seq_printf(m, ",rsize=%d", fsopt->rsize);
461 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
462 seq_printf(m, ",rasize=%d", fsopt->rasize);
463 if (fsopt->congestion_kb != default_congestion_kb())
464 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
465 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
466 seq_printf(m, ",caps_wanted_delay_min=%d",
467 fsopt->caps_wanted_delay_min);
468 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
469 seq_printf(m, ",caps_wanted_delay_max=%d",
470 fsopt->caps_wanted_delay_max);
471 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
472 seq_printf(m, ",cap_release_safety=%d",
473 fsopt->cap_release_safety);
474 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
475 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
476 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
477 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
478 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
479 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
484 * handle any mon messages the standard library doesn't understand.
485 * return error if we don't either.
487 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
489 struct ceph_fs_client *fsc = client->private;
490 int type = le16_to_cpu(msg->hdr.type);
493 case CEPH_MSG_MDS_MAP:
494 ceph_mdsc_handle_map(fsc->mdsc, msg);
503 * create a new fs client
505 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
506 struct ceph_options *opt)
508 struct ceph_fs_client *fsc;
509 const u64 supported_features =
511 CEPH_FEATURE_DIRLAYOUTHASH |
512 CEPH_FEATURE_MDS_INLINE_DATA;
513 const u64 required_features = 0;
518 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
520 return ERR_PTR(-ENOMEM);
522 fsc->client = ceph_create_client(opt, fsc, supported_features,
524 if (IS_ERR(fsc->client)) {
525 err = PTR_ERR(fsc->client);
528 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
529 fsc->client->monc.want_mdsmap = 1;
531 fsc->mount_options = fsopt;
534 fsc->mount_state = CEPH_MOUNT_MOUNTING;
536 atomic_long_set(&fsc->writeback_count, 0);
538 err = bdi_init(&fsc->backing_dev_info);
544 * The number of concurrent works can be high but they don't need
545 * to be processed in parallel, limit concurrency.
547 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
548 if (fsc->wb_wq == NULL)
550 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
551 if (fsc->pg_inv_wq == NULL)
553 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
554 if (fsc->trunc_wq == NULL)
557 /* set up mempools */
559 page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT;
560 size = sizeof (struct page *) * (page_count ? page_count : 1);
561 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
562 if (!fsc->wb_pagevec_pool)
566 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
567 (ceph_fscache_register_fs(fsc) != 0))
571 fsc->min_caps = fsopt->max_readdir;
576 ceph_fscache_unregister_fs(fsc);
578 destroy_workqueue(fsc->trunc_wq);
580 destroy_workqueue(fsc->pg_inv_wq);
582 destroy_workqueue(fsc->wb_wq);
584 bdi_destroy(&fsc->backing_dev_info);
586 ceph_destroy_client(fsc->client);
592 static void destroy_fs_client(struct ceph_fs_client *fsc)
594 dout("destroy_fs_client %p\n", fsc);
596 ceph_fscache_unregister_fs(fsc);
598 destroy_workqueue(fsc->wb_wq);
599 destroy_workqueue(fsc->pg_inv_wq);
600 destroy_workqueue(fsc->trunc_wq);
602 bdi_destroy(&fsc->backing_dev_info);
604 mempool_destroy(fsc->wb_pagevec_pool);
606 destroy_mount_options(fsc->mount_options);
608 ceph_fs_debugfs_cleanup(fsc);
610 ceph_destroy_client(fsc->client);
613 dout("destroy_fs_client %p done\n", fsc);
619 struct kmem_cache *ceph_inode_cachep;
620 struct kmem_cache *ceph_cap_cachep;
621 struct kmem_cache *ceph_dentry_cachep;
622 struct kmem_cache *ceph_file_cachep;
624 static void ceph_inode_init_once(void *foo)
626 struct ceph_inode_info *ci = foo;
627 inode_init_once(&ci->vfs_inode);
630 static int __init init_caches(void)
634 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
635 sizeof(struct ceph_inode_info),
636 __alignof__(struct ceph_inode_info),
637 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
638 ceph_inode_init_once);
639 if (ceph_inode_cachep == NULL)
642 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
643 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
644 if (ceph_cap_cachep == NULL)
647 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
648 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
649 if (ceph_dentry_cachep == NULL)
652 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
653 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
654 if (ceph_file_cachep == NULL)
657 if ((error = ceph_fscache_register()))
662 kmem_cache_destroy(ceph_dentry_cachep);
664 kmem_cache_destroy(ceph_cap_cachep);
666 kmem_cache_destroy(ceph_inode_cachep);
670 static void destroy_caches(void)
673 * Make sure all delayed rcu free inodes are flushed before we
678 kmem_cache_destroy(ceph_inode_cachep);
679 kmem_cache_destroy(ceph_cap_cachep);
680 kmem_cache_destroy(ceph_dentry_cachep);
681 kmem_cache_destroy(ceph_file_cachep);
683 ceph_fscache_unregister();
688 * ceph_umount_begin - initiate forced umount. Tear down down the
689 * mount, skipping steps that may hang while waiting for server(s).
691 static void ceph_umount_begin(struct super_block *sb)
693 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
695 dout("ceph_umount_begin - starting forced umount\n");
698 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
702 static const struct super_operations ceph_super_ops = {
703 .alloc_inode = ceph_alloc_inode,
704 .destroy_inode = ceph_destroy_inode,
705 .write_inode = ceph_write_inode,
706 .drop_inode = ceph_drop_inode,
707 .sync_fs = ceph_sync_fs,
708 .put_super = ceph_put_super,
709 .show_options = ceph_show_options,
710 .statfs = ceph_statfs,
711 .umount_begin = ceph_umount_begin,
715 * Bootstrap mount by opening the root directory. Note the mount
716 * @started time from caller, and time out if this takes too long.
718 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
720 unsigned long started)
722 struct ceph_mds_client *mdsc = fsc->mdsc;
723 struct ceph_mds_request *req = NULL;
728 dout("open_root_inode opening '%s'\n", path);
729 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
731 return ERR_CAST(req);
732 req->r_path1 = kstrdup(path, GFP_NOFS);
733 req->r_ino1.ino = CEPH_INO_ROOT;
734 req->r_ino1.snap = CEPH_NOSNAP;
735 req->r_started = started;
736 req->r_timeout = fsc->client->options->mount_timeout * HZ;
737 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
739 err = ceph_mdsc_do_request(mdsc, NULL, req);
741 struct inode *inode = req->r_target_inode;
742 req->r_target_inode = NULL;
743 dout("open_root_inode success\n");
744 if (ceph_ino(inode) == CEPH_INO_ROOT &&
745 fsc->sb->s_root == NULL) {
746 root = d_make_root(inode);
748 root = ERR_PTR(-ENOMEM);
752 root = d_obtain_root(inode);
754 ceph_init_dentry(root);
755 dout("open_root_inode success, root dentry is %p\n", root);
760 ceph_mdsc_put_request(req);
768 * mount: join the ceph cluster, and open root directory.
770 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
774 unsigned long started = jiffies; /* note the start time */
776 int first = 0; /* first vfsmount for this super_block */
778 dout("mount start\n");
779 mutex_lock(&fsc->client->mount_mutex);
781 err = __ceph_open_session(fsc->client, started);
785 dout("mount opening root\n");
786 root = open_root_dentry(fsc, "", started);
791 if (fsc->sb->s_root) {
794 fsc->sb->s_root = root;
797 err = ceph_fs_debugfs_init(fsc);
805 dout("mount opening base mountpoint\n");
806 root = open_root_dentry(fsc, path, started);
813 fsc->mount_state = CEPH_MOUNT_MOUNTED;
814 dout("mount success\n");
815 mutex_unlock(&fsc->client->mount_mutex);
819 mutex_unlock(&fsc->client->mount_mutex);
824 dput(fsc->sb->s_root);
825 fsc->sb->s_root = NULL;
830 static int ceph_set_super(struct super_block *s, void *data)
832 struct ceph_fs_client *fsc = data;
835 dout("set_super %p data %p\n", s, data);
837 s->s_flags = fsc->mount_options->sb_flags;
838 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
840 s->s_xattr = ceph_xattr_handlers;
844 s->s_op = &ceph_super_ops;
845 s->s_export_op = &ceph_export_ops;
847 s->s_time_gran = 1000; /* 1000 ns == 1 us */
849 ret = set_anon_super(s, NULL); /* what is that second arg for? */
862 * share superblock if same fs AND options
864 static int ceph_compare_super(struct super_block *sb, void *data)
866 struct ceph_fs_client *new = data;
867 struct ceph_mount_options *fsopt = new->mount_options;
868 struct ceph_options *opt = new->client->options;
869 struct ceph_fs_client *other = ceph_sb_to_client(sb);
871 dout("ceph_compare_super %p\n", sb);
873 if (compare_mount_options(fsopt, opt, other)) {
874 dout("monitor(s)/mount options don't match\n");
877 if ((opt->flags & CEPH_OPT_FSID) &&
878 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
879 dout("fsid doesn't match\n");
882 if (fsopt->sb_flags != other->mount_options->sb_flags) {
883 dout("flags differ\n");
890 * construct our own bdi so we can control readahead, etc.
892 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
894 static int ceph_register_bdi(struct super_block *sb,
895 struct ceph_fs_client *fsc)
899 /* set ra_pages based on rasize mount option? */
900 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
901 fsc->backing_dev_info.ra_pages =
902 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
905 fsc->backing_dev_info.ra_pages =
906 VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE;
908 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
909 atomic_long_inc_return(&bdi_seq));
911 sb->s_bdi = &fsc->backing_dev_info;
915 static struct dentry *ceph_mount(struct file_system_type *fs_type,
916 int flags, const char *dev_name, void *data)
918 struct super_block *sb;
919 struct ceph_fs_client *fsc;
922 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
923 const char *path = NULL;
924 struct ceph_mount_options *fsopt = NULL;
925 struct ceph_options *opt = NULL;
927 dout("ceph_mount\n");
929 #ifdef CONFIG_CEPH_FS_POSIX_ACL
930 flags |= MS_POSIXACL;
932 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
938 /* create client (which we may/may not use) */
939 fsc = create_fs_client(fsopt, opt);
942 destroy_mount_options(fsopt);
943 ceph_destroy_options(opt);
947 err = ceph_mdsc_init(fsc);
953 if (ceph_test_opt(fsc->client, NOSHARE))
954 compare_super = NULL;
955 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
961 if (ceph_sb_to_client(sb) != fsc) {
962 ceph_mdsc_destroy(fsc);
963 destroy_fs_client(fsc);
964 fsc = ceph_sb_to_client(sb);
965 dout("get_sb got existing client %p\n", fsc);
967 dout("get_sb using new client %p\n", fsc);
968 err = ceph_register_bdi(sb, fsc);
975 res = ceph_real_mount(fsc, path);
978 dout("root %p inode %p ino %llx.%llx\n", res,
979 res->d_inode, ceph_vinop(res->d_inode));
983 ceph_mdsc_close_sessions(fsc->mdsc);
984 deactivate_locked_super(sb);
988 ceph_mdsc_destroy(fsc);
989 destroy_fs_client(fsc);
991 dout("ceph_mount fail %ld\n", PTR_ERR(res));
995 static void ceph_kill_sb(struct super_block *s)
997 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
998 dev_t dev = s->s_dev;
1000 dout("kill_sb %p\n", s);
1002 ceph_mdsc_pre_umount(fsc->mdsc);
1003 generic_shutdown_super(s);
1004 ceph_mdsc_destroy(fsc);
1006 destroy_fs_client(fsc);
1007 free_anon_bdev(dev);
1010 static struct file_system_type ceph_fs_type = {
1011 .owner = THIS_MODULE,
1013 .mount = ceph_mount,
1014 .kill_sb = ceph_kill_sb,
1015 .fs_flags = FS_RENAME_DOES_D_MOVE,
1017 MODULE_ALIAS_FS("ceph");
1019 static int __init init_ceph(void)
1021 int ret = init_caches();
1027 ret = ceph_snap_init();
1030 ret = register_filesystem(&ceph_fs_type);
1034 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1047 static void __exit exit_ceph(void)
1049 dout("exit_ceph\n");
1050 unregister_filesystem(&ceph_fs_type);
1056 module_init(init_ceph);
1057 module_exit(exit_ceph);
1059 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1060 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1061 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1062 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1063 MODULE_LICENSE("GPL");