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"
21 #include <linux/ceph/decode.h>
22 #include <linux/ceph/mon_client.h>
23 #include <linux/ceph/auth.h>
24 #include <linux/ceph/debugfs.h>
27 * Ceph superblock operations
29 * Handle the basics of mounting, unmounting.
35 static void ceph_put_super(struct super_block *s)
37 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
40 ceph_mdsc_close_sessions(fsc->mdsc);
43 * ensure we release the bdi before put_anon_super releases
46 if (s->s_bdi == &fsc->backing_dev_info) {
47 bdi_unregister(&fsc->backing_dev_info);
54 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
56 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
57 struct ceph_monmap *monmap = fsc->client->monc.monmap;
58 struct ceph_statfs st;
63 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
68 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
71 * express utilization in terms of large blocks to avoid
72 * overflow on 32-bit machines.
74 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
75 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
76 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
77 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
79 buf->f_files = le64_to_cpu(st.num_objects);
81 buf->f_namelen = NAME_MAX;
82 buf->f_frsize = PAGE_CACHE_SIZE;
84 /* leave fsid little-endian, regardless of host endianness */
85 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
86 buf->f_fsid.val[0] = fsid & 0xffffffff;
87 buf->f_fsid.val[1] = fsid >> 32;
93 static int ceph_sync_fs(struct super_block *sb, int wait)
95 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
98 dout("sync_fs (non-blocking)\n");
99 ceph_flush_dirty_caps(fsc->mdsc);
100 dout("sync_fs (non-blocking) done\n");
104 dout("sync_fs (blocking)\n");
105 ceph_osdc_sync(&fsc->client->osdc);
106 ceph_mdsc_sync(fsc->mdsc);
107 dout("sync_fs (blocking) done\n");
118 Opt_caps_wanted_delay_min,
119 Opt_caps_wanted_delay_max,
120 Opt_cap_release_safety,
121 Opt_readdir_max_entries,
122 Opt_readdir_max_bytes,
128 /* string args above */
139 static match_table_t fsopt_tokens = {
140 {Opt_wsize, "wsize=%d"},
141 {Opt_rsize, "rsize=%d"},
142 {Opt_rasize, "rasize=%d"},
143 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
144 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
145 {Opt_cap_release_safety, "cap_release_safety=%d"},
146 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
147 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
148 {Opt_congestion_kb, "write_congestion_kb=%d"},
150 {Opt_snapdirname, "snapdirname=%s"},
151 /* string args above */
152 {Opt_dirstat, "dirstat"},
153 {Opt_nodirstat, "nodirstat"},
154 {Opt_rbytes, "rbytes"},
155 {Opt_norbytes, "norbytes"},
156 {Opt_noasyncreaddir, "noasyncreaddir"},
157 {Opt_dcache, "dcache"},
158 {Opt_nodcache, "nodcache"},
159 {Opt_ino32, "ino32"},
163 static int parse_fsopt_token(char *c, void *private)
165 struct ceph_mount_options *fsopt = private;
166 substring_t argstr[MAX_OPT_ARGS];
167 int token, intval, ret;
169 token = match_token((char *)c, fsopt_tokens, argstr);
173 if (token < Opt_last_int) {
174 ret = match_int(&argstr[0], &intval);
176 pr_err("bad mount option arg (not int) "
180 dout("got int token %d val %d\n", token, intval);
181 } else if (token > Opt_last_int && token < Opt_last_string) {
182 dout("got string token %d val %s\n", token,
185 dout("got token %d\n", token);
189 case Opt_snapdirname:
190 kfree(fsopt->snapdir_name);
191 fsopt->snapdir_name = kstrndup(argstr[0].from,
192 argstr[0].to-argstr[0].from,
194 if (!fsopt->snapdir_name)
200 fsopt->wsize = intval;
203 fsopt->rsize = intval;
206 fsopt->rasize = intval;
208 case Opt_caps_wanted_delay_min:
209 fsopt->caps_wanted_delay_min = intval;
211 case Opt_caps_wanted_delay_max:
212 fsopt->caps_wanted_delay_max = intval;
214 case Opt_readdir_max_entries:
215 fsopt->max_readdir = intval;
217 case Opt_readdir_max_bytes:
218 fsopt->max_readdir_bytes = intval;
220 case Opt_congestion_kb:
221 fsopt->congestion_kb = intval;
224 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
227 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
230 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
233 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
235 case Opt_noasyncreaddir:
236 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
239 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
242 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
245 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
253 static void destroy_mount_options(struct ceph_mount_options *args)
255 dout("destroy_mount_options %p\n", args);
256 kfree(args->snapdir_name);
260 static int strcmp_null(const char *s1, const char *s2)
268 return strcmp(s1, s2);
271 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
272 struct ceph_options *new_opt,
273 struct ceph_fs_client *fsc)
275 struct ceph_mount_options *fsopt1 = new_fsopt;
276 struct ceph_mount_options *fsopt2 = fsc->mount_options;
277 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
280 ret = memcmp(fsopt1, fsopt2, ofs);
284 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
288 return ceph_compare_options(new_opt, fsc->client);
291 static int parse_mount_options(struct ceph_mount_options **pfsopt,
292 struct ceph_options **popt,
293 int flags, char *options,
294 const char *dev_name,
297 struct ceph_mount_options *fsopt;
298 const char *dev_name_end;
301 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
305 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
307 fsopt->sb_flags = flags;
308 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
310 fsopt->rsize = CEPH_RSIZE_DEFAULT;
311 fsopt->rasize = CEPH_RASIZE_DEFAULT;
312 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
313 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
314 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
315 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
316 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
317 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
318 fsopt->congestion_kb = default_congestion_kb();
320 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
324 *path = strstr(dev_name, ":/");
326 pr_err("device name is missing path (no :/ in %s)\n",
330 dev_name_end = *path;
331 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
335 dout("server path '%s'\n", *path);
337 err = ceph_parse_options(popt, options, dev_name, dev_name_end,
338 parse_fsopt_token, (void *)fsopt);
347 destroy_mount_options(fsopt);
352 * ceph_show_options - Show mount options in /proc/mounts
353 * @m: seq_file to write to
354 * @root: root of that (sub)tree
356 static int ceph_show_options(struct seq_file *m, struct dentry *root)
358 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
359 struct ceph_mount_options *fsopt = fsc->mount_options;
360 struct ceph_options *opt = fsc->client->options;
362 if (opt->flags & CEPH_OPT_FSID)
363 seq_printf(m, ",fsid=%pU", &opt->fsid);
364 if (opt->flags & CEPH_OPT_NOSHARE)
365 seq_puts(m, ",noshare");
366 if (opt->flags & CEPH_OPT_NOCRC)
367 seq_puts(m, ",nocrc");
370 seq_printf(m, ",name=%s", opt->name);
372 seq_puts(m, ",secret=<hidden>");
374 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
375 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
376 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
377 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
378 if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
379 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout);
380 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
381 seq_printf(m, ",osdkeepalivetimeout=%d",
382 opt->osd_keepalive_timeout);
384 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
385 seq_puts(m, ",dirstat");
386 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
387 seq_puts(m, ",norbytes");
388 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
389 seq_puts(m, ",noasyncreaddir");
390 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
391 seq_puts(m, ",dcache");
393 seq_puts(m, ",nodcache");
396 seq_printf(m, ",wsize=%d", fsopt->wsize);
397 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
398 seq_printf(m, ",rsize=%d", fsopt->rsize);
399 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
400 seq_printf(m, ",rasize=%d", fsopt->rasize);
401 if (fsopt->congestion_kb != default_congestion_kb())
402 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
403 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
404 seq_printf(m, ",caps_wanted_delay_min=%d",
405 fsopt->caps_wanted_delay_min);
406 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
407 seq_printf(m, ",caps_wanted_delay_max=%d",
408 fsopt->caps_wanted_delay_max);
409 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
410 seq_printf(m, ",cap_release_safety=%d",
411 fsopt->cap_release_safety);
412 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
413 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
414 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
415 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
416 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
417 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
422 * handle any mon messages the standard library doesn't understand.
423 * return error if we don't either.
425 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
427 struct ceph_fs_client *fsc = client->private;
428 int type = le16_to_cpu(msg->hdr.type);
431 case CEPH_MSG_MDS_MAP:
432 ceph_mdsc_handle_map(fsc->mdsc, msg);
441 * create a new fs client
443 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
444 struct ceph_options *opt)
446 struct ceph_fs_client *fsc;
447 const unsigned supported_features =
449 CEPH_FEATURE_DIRLAYOUTHASH;
450 const unsigned required_features = 0;
453 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
455 return ERR_PTR(-ENOMEM);
457 fsc->client = ceph_create_client(opt, fsc, supported_features,
459 if (IS_ERR(fsc->client)) {
460 err = PTR_ERR(fsc->client);
463 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
464 fsc->client->monc.want_mdsmap = 1;
466 fsc->mount_options = fsopt;
469 fsc->mount_state = CEPH_MOUNT_MOUNTING;
471 atomic_long_set(&fsc->writeback_count, 0);
473 err = bdi_init(&fsc->backing_dev_info);
479 * The number of concurrent works can be high but they don't need
480 * to be processed in parallel, limit concurrency.
482 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
483 if (fsc->wb_wq == NULL)
485 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
486 if (fsc->pg_inv_wq == NULL)
488 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
489 if (fsc->trunc_wq == NULL)
492 /* set up mempools */
494 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
495 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
496 if (!fsc->wb_pagevec_pool)
500 fsc->min_caps = fsopt->max_readdir;
505 destroy_workqueue(fsc->trunc_wq);
507 destroy_workqueue(fsc->pg_inv_wq);
509 destroy_workqueue(fsc->wb_wq);
511 bdi_destroy(&fsc->backing_dev_info);
513 ceph_destroy_client(fsc->client);
519 static void destroy_fs_client(struct ceph_fs_client *fsc)
521 dout("destroy_fs_client %p\n", fsc);
523 destroy_workqueue(fsc->wb_wq);
524 destroy_workqueue(fsc->pg_inv_wq);
525 destroy_workqueue(fsc->trunc_wq);
527 bdi_destroy(&fsc->backing_dev_info);
529 mempool_destroy(fsc->wb_pagevec_pool);
531 destroy_mount_options(fsc->mount_options);
533 ceph_fs_debugfs_cleanup(fsc);
535 ceph_destroy_client(fsc->client);
538 dout("destroy_fs_client %p done\n", fsc);
544 struct kmem_cache *ceph_inode_cachep;
545 struct kmem_cache *ceph_cap_cachep;
546 struct kmem_cache *ceph_dentry_cachep;
547 struct kmem_cache *ceph_file_cachep;
549 static void ceph_inode_init_once(void *foo)
551 struct ceph_inode_info *ci = foo;
552 inode_init_once(&ci->vfs_inode);
555 static int __init init_caches(void)
557 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
558 sizeof(struct ceph_inode_info),
559 __alignof__(struct ceph_inode_info),
560 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
561 ceph_inode_init_once);
562 if (ceph_inode_cachep == NULL)
565 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
566 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
567 if (ceph_cap_cachep == NULL)
570 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
571 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
572 if (ceph_dentry_cachep == NULL)
575 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
576 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
577 if (ceph_file_cachep == NULL)
583 kmem_cache_destroy(ceph_dentry_cachep);
585 kmem_cache_destroy(ceph_cap_cachep);
587 kmem_cache_destroy(ceph_inode_cachep);
591 static void destroy_caches(void)
593 kmem_cache_destroy(ceph_inode_cachep);
594 kmem_cache_destroy(ceph_cap_cachep);
595 kmem_cache_destroy(ceph_dentry_cachep);
596 kmem_cache_destroy(ceph_file_cachep);
601 * ceph_umount_begin - initiate forced umount. Tear down down the
602 * mount, skipping steps that may hang while waiting for server(s).
604 static void ceph_umount_begin(struct super_block *sb)
606 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
608 dout("ceph_umount_begin - starting forced umount\n");
611 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
615 static const struct super_operations ceph_super_ops = {
616 .alloc_inode = ceph_alloc_inode,
617 .destroy_inode = ceph_destroy_inode,
618 .write_inode = ceph_write_inode,
619 .sync_fs = ceph_sync_fs,
620 .put_super = ceph_put_super,
621 .show_options = ceph_show_options,
622 .statfs = ceph_statfs,
623 .umount_begin = ceph_umount_begin,
627 * Bootstrap mount by opening the root directory. Note the mount
628 * @started time from caller, and time out if this takes too long.
630 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
632 unsigned long started)
634 struct ceph_mds_client *mdsc = fsc->mdsc;
635 struct ceph_mds_request *req = NULL;
640 dout("open_root_inode opening '%s'\n", path);
641 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
643 return ERR_CAST(req);
644 req->r_path1 = kstrdup(path, GFP_NOFS);
645 req->r_ino1.ino = CEPH_INO_ROOT;
646 req->r_ino1.snap = CEPH_NOSNAP;
647 req->r_started = started;
648 req->r_timeout = fsc->client->options->mount_timeout * HZ;
649 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
651 err = ceph_mdsc_do_request(mdsc, NULL, req);
653 struct inode *inode = req->r_target_inode;
654 req->r_target_inode = NULL;
655 dout("open_root_inode success\n");
656 if (ceph_ino(inode) == CEPH_INO_ROOT &&
657 fsc->sb->s_root == NULL) {
658 root = d_make_root(inode);
660 root = ERR_PTR(-ENOMEM);
664 root = d_obtain_alias(inode);
666 ceph_init_dentry(root);
667 dout("open_root_inode success, root dentry is %p\n", root);
672 ceph_mdsc_put_request(req);
680 * mount: join the ceph cluster, and open root directory.
682 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
686 unsigned long started = jiffies; /* note the start time */
688 int first = 0; /* first vfsmount for this super_block */
690 dout("mount start\n");
691 mutex_lock(&fsc->client->mount_mutex);
693 err = __ceph_open_session(fsc->client, started);
697 dout("mount opening root\n");
698 root = open_root_dentry(fsc, "", started);
703 if (fsc->sb->s_root) {
706 fsc->sb->s_root = root;
709 err = ceph_fs_debugfs_init(fsc);
717 dout("mount opening base mountpoint\n");
718 root = open_root_dentry(fsc, path, started);
725 fsc->mount_state = CEPH_MOUNT_MOUNTED;
726 dout("mount success\n");
727 mutex_unlock(&fsc->client->mount_mutex);
731 mutex_unlock(&fsc->client->mount_mutex);
736 dput(fsc->sb->s_root);
737 fsc->sb->s_root = NULL;
742 static int ceph_set_super(struct super_block *s, void *data)
744 struct ceph_fs_client *fsc = data;
747 dout("set_super %p data %p\n", s, data);
749 s->s_flags = fsc->mount_options->sb_flags;
750 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
755 s->s_op = &ceph_super_ops;
756 s->s_export_op = &ceph_export_ops;
758 s->s_time_gran = 1000; /* 1000 ns == 1 us */
760 ret = set_anon_super(s, NULL); /* what is that second arg for? */
773 * share superblock if same fs AND options
775 static int ceph_compare_super(struct super_block *sb, void *data)
777 struct ceph_fs_client *new = data;
778 struct ceph_mount_options *fsopt = new->mount_options;
779 struct ceph_options *opt = new->client->options;
780 struct ceph_fs_client *other = ceph_sb_to_client(sb);
782 dout("ceph_compare_super %p\n", sb);
784 if (compare_mount_options(fsopt, opt, other)) {
785 dout("monitor(s)/mount options don't match\n");
788 if ((opt->flags & CEPH_OPT_FSID) &&
789 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
790 dout("fsid doesn't match\n");
793 if (fsopt->sb_flags != other->mount_options->sb_flags) {
794 dout("flags differ\n");
801 * construct our own bdi so we can control readahead, etc.
803 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
805 static int ceph_register_bdi(struct super_block *sb,
806 struct ceph_fs_client *fsc)
810 /* set ra_pages based on rasize mount option? */
811 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
812 fsc->backing_dev_info.ra_pages =
813 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
816 fsc->backing_dev_info.ra_pages =
817 default_backing_dev_info.ra_pages;
819 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d",
820 atomic_long_inc_return(&bdi_seq));
822 sb->s_bdi = &fsc->backing_dev_info;
826 static struct dentry *ceph_mount(struct file_system_type *fs_type,
827 int flags, const char *dev_name, void *data)
829 struct super_block *sb;
830 struct ceph_fs_client *fsc;
833 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
834 const char *path = NULL;
835 struct ceph_mount_options *fsopt = NULL;
836 struct ceph_options *opt = NULL;
838 dout("ceph_mount\n");
839 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
845 /* create client (which we may/may not use) */
846 fsc = create_fs_client(fsopt, opt);
849 destroy_mount_options(fsopt);
850 ceph_destroy_options(opt);
854 err = ceph_mdsc_init(fsc);
860 if (ceph_test_opt(fsc->client, NOSHARE))
861 compare_super = NULL;
862 sb = sget(fs_type, compare_super, ceph_set_super, fsc);
868 if (ceph_sb_to_client(sb) != fsc) {
869 ceph_mdsc_destroy(fsc);
870 destroy_fs_client(fsc);
871 fsc = ceph_sb_to_client(sb);
872 dout("get_sb got existing client %p\n", fsc);
874 dout("get_sb using new client %p\n", fsc);
875 err = ceph_register_bdi(sb, fsc);
882 res = ceph_real_mount(fsc, path);
885 dout("root %p inode %p ino %llx.%llx\n", res,
886 res->d_inode, ceph_vinop(res->d_inode));
890 ceph_mdsc_close_sessions(fsc->mdsc);
891 deactivate_locked_super(sb);
895 ceph_mdsc_destroy(fsc);
896 destroy_fs_client(fsc);
898 dout("ceph_mount fail %ld\n", PTR_ERR(res));
902 static void ceph_kill_sb(struct super_block *s)
904 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
905 dout("kill_sb %p\n", s);
906 ceph_mdsc_pre_umount(fsc->mdsc);
907 kill_anon_super(s); /* will call put_super after sb is r/o */
908 ceph_mdsc_destroy(fsc);
909 destroy_fs_client(fsc);
912 static struct file_system_type ceph_fs_type = {
913 .owner = THIS_MODULE,
916 .kill_sb = ceph_kill_sb,
917 .fs_flags = FS_RENAME_DOES_D_MOVE,
920 #define _STRINGIFY(x) #x
921 #define STRINGIFY(x) _STRINGIFY(x)
923 static int __init init_ceph(void)
925 int ret = init_caches();
929 ret = register_filesystem(&ceph_fs_type);
933 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
943 static void __exit exit_ceph(void)
946 unregister_filesystem(&ceph_fs_type);
950 module_init(init_ceph);
951 module_exit(exit_ceph);
953 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
954 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
955 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
956 MODULE_DESCRIPTION("Ceph filesystem for Linux");
957 MODULE_LICENSE("GPL");