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 * NOTE: for the time being, we make bsize == frsize to humor
75 * not-yet-ancient versions of glibc that are broken.
76 * Someday, we will probably want to report a real block
77 * size... whatever that may mean for a network file system!
79 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
80 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
81 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
82 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
83 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
85 buf->f_files = le64_to_cpu(st.num_objects);
87 buf->f_namelen = NAME_MAX;
89 /* leave fsid little-endian, regardless of host endianness */
90 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
91 buf->f_fsid.val[0] = fsid & 0xffffffff;
92 buf->f_fsid.val[1] = fsid >> 32;
98 static int ceph_sync_fs(struct super_block *sb, int wait)
100 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
103 dout("sync_fs (non-blocking)\n");
104 ceph_flush_dirty_caps(fsc->mdsc);
105 dout("sync_fs (non-blocking) done\n");
109 dout("sync_fs (blocking)\n");
110 ceph_osdc_sync(&fsc->client->osdc);
111 ceph_mdsc_sync(fsc->mdsc);
112 dout("sync_fs (blocking) done\n");
123 Opt_caps_wanted_delay_min,
124 Opt_caps_wanted_delay_max,
125 Opt_cap_release_safety,
126 Opt_readdir_max_entries,
127 Opt_readdir_max_bytes,
133 /* string args above */
142 static match_table_t fsopt_tokens = {
143 {Opt_wsize, "wsize=%d"},
144 {Opt_rsize, "rsize=%d"},
145 {Opt_rasize, "rasize=%d"},
146 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
147 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
148 {Opt_cap_release_safety, "cap_release_safety=%d"},
149 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
150 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
151 {Opt_congestion_kb, "write_congestion_kb=%d"},
153 {Opt_snapdirname, "snapdirname=%s"},
154 /* string args above */
155 {Opt_dirstat, "dirstat"},
156 {Opt_nodirstat, "nodirstat"},
157 {Opt_rbytes, "rbytes"},
158 {Opt_norbytes, "norbytes"},
159 {Opt_noasyncreaddir, "noasyncreaddir"},
160 {Opt_ino32, "ino32"},
164 static int parse_fsopt_token(char *c, void *private)
166 struct ceph_mount_options *fsopt = private;
167 substring_t argstr[MAX_OPT_ARGS];
168 int token, intval, ret;
170 token = match_token((char *)c, fsopt_tokens, argstr);
174 if (token < Opt_last_int) {
175 ret = match_int(&argstr[0], &intval);
177 pr_err("bad mount option arg (not int) "
181 dout("got int token %d val %d\n", token, intval);
182 } else if (token > Opt_last_int && token < Opt_last_string) {
183 dout("got string token %d val %s\n", token,
186 dout("got token %d\n", token);
190 case Opt_snapdirname:
191 kfree(fsopt->snapdir_name);
192 fsopt->snapdir_name = kstrndup(argstr[0].from,
193 argstr[0].to-argstr[0].from,
195 if (!fsopt->snapdir_name)
201 fsopt->wsize = intval;
204 fsopt->rsize = intval;
207 fsopt->rasize = intval;
209 case Opt_caps_wanted_delay_min:
210 fsopt->caps_wanted_delay_min = intval;
212 case Opt_caps_wanted_delay_max:
213 fsopt->caps_wanted_delay_max = intval;
215 case Opt_readdir_max_entries:
216 fsopt->max_readdir = intval;
218 case Opt_readdir_max_bytes:
219 fsopt->max_readdir_bytes = intval;
221 case Opt_congestion_kb:
222 fsopt->congestion_kb = intval;
225 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
228 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
231 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
234 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
236 case Opt_noasyncreaddir:
237 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
240 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
248 static void destroy_mount_options(struct ceph_mount_options *args)
250 dout("destroy_mount_options %p\n", args);
251 kfree(args->snapdir_name);
255 static int strcmp_null(const char *s1, const char *s2)
263 return strcmp(s1, s2);
266 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
267 struct ceph_options *new_opt,
268 struct ceph_fs_client *fsc)
270 struct ceph_mount_options *fsopt1 = new_fsopt;
271 struct ceph_mount_options *fsopt2 = fsc->mount_options;
272 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
275 ret = memcmp(fsopt1, fsopt2, ofs);
279 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
283 return ceph_compare_options(new_opt, fsc->client);
286 static int parse_mount_options(struct ceph_mount_options **pfsopt,
287 struct ceph_options **popt,
288 int flags, char *options,
289 const char *dev_name,
292 struct ceph_mount_options *fsopt;
293 const char *dev_name_end;
296 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
300 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
302 fsopt->sb_flags = flags;
303 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
305 fsopt->rsize = CEPH_RSIZE_DEFAULT;
306 fsopt->rasize = CEPH_RASIZE_DEFAULT;
307 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
308 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
309 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
310 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
311 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
312 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
313 fsopt->congestion_kb = default_congestion_kb();
315 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
319 *path = strstr(dev_name, ":/");
321 pr_err("device name is missing path (no :/ in %s)\n",
325 dev_name_end = *path;
326 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
330 dout("server path '%s'\n", *path);
332 err = ceph_parse_options(popt, options, dev_name, dev_name_end,
333 parse_fsopt_token, (void *)fsopt);
342 destroy_mount_options(fsopt);
347 * ceph_show_options - Show mount options in /proc/mounts
348 * @m: seq_file to write to
349 * @mnt: mount descriptor
351 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
353 struct ceph_fs_client *fsc = ceph_sb_to_client(mnt->mnt_sb);
354 struct ceph_mount_options *fsopt = fsc->mount_options;
355 struct ceph_options *opt = fsc->client->options;
357 if (opt->flags & CEPH_OPT_FSID)
358 seq_printf(m, ",fsid=%pU", &opt->fsid);
359 if (opt->flags & CEPH_OPT_NOSHARE)
360 seq_puts(m, ",noshare");
361 if (opt->flags & CEPH_OPT_NOCRC)
362 seq_puts(m, ",nocrc");
365 seq_puts(m, ",name=");
366 seq_escape(m, opt->name, ", \t\n\\");
369 seq_puts(m, ",secret=<hidden>");
371 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
372 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
373 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
374 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
375 if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
376 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout);
377 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
378 seq_printf(m, ",osdkeepalivetimeout=%d",
379 opt->osd_keepalive_timeout);
381 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
382 seq_puts(m, ",dirstat");
383 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
384 seq_puts(m, ",norbytes");
385 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
386 seq_puts(m, ",noasyncreaddir");
389 seq_printf(m, ",wsize=%d", fsopt->wsize);
390 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
391 seq_printf(m, ",rsize=%d", fsopt->rsize);
392 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
393 seq_printf(m, ",rasize=%d", fsopt->rasize);
394 if (fsopt->congestion_kb != default_congestion_kb())
395 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
396 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
397 seq_printf(m, ",caps_wanted_delay_min=%d",
398 fsopt->caps_wanted_delay_min);
399 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
400 seq_printf(m, ",caps_wanted_delay_max=%d",
401 fsopt->caps_wanted_delay_max);
402 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
403 seq_printf(m, ",cap_release_safety=%d",
404 fsopt->cap_release_safety);
405 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
406 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
407 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
408 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
409 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
410 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
415 * handle any mon messages the standard library doesn't understand.
416 * return error if we don't either.
418 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
420 struct ceph_fs_client *fsc = client->private;
421 int type = le16_to_cpu(msg->hdr.type);
424 case CEPH_MSG_MDS_MAP:
425 ceph_mdsc_handle_map(fsc->mdsc, msg);
434 * create a new fs client
436 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
437 struct ceph_options *opt)
439 struct ceph_fs_client *fsc;
440 const unsigned supported_features =
442 CEPH_FEATURE_DIRLAYOUTHASH;
443 const unsigned required_features = 0;
446 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
448 return ERR_PTR(-ENOMEM);
450 fsc->client = ceph_create_client(opt, fsc, supported_features,
452 if (IS_ERR(fsc->client)) {
453 err = PTR_ERR(fsc->client);
456 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
457 fsc->client->monc.want_mdsmap = 1;
459 fsc->mount_options = fsopt;
462 fsc->mount_state = CEPH_MOUNT_MOUNTING;
464 atomic_long_set(&fsc->writeback_count, 0);
466 err = bdi_init(&fsc->backing_dev_info);
472 * The number of concurrent works can be high but they don't need
473 * to be processed in parallel, limit concurrency.
475 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
476 if (fsc->wb_wq == NULL)
478 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
479 if (fsc->pg_inv_wq == NULL)
481 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
482 if (fsc->trunc_wq == NULL)
485 /* set up mempools */
487 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
488 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
489 if (!fsc->wb_pagevec_pool)
493 fsc->min_caps = fsopt->max_readdir;
498 destroy_workqueue(fsc->trunc_wq);
500 destroy_workqueue(fsc->pg_inv_wq);
502 destroy_workqueue(fsc->wb_wq);
504 bdi_destroy(&fsc->backing_dev_info);
506 ceph_destroy_client(fsc->client);
512 static void destroy_fs_client(struct ceph_fs_client *fsc)
514 dout("destroy_fs_client %p\n", fsc);
516 destroy_workqueue(fsc->wb_wq);
517 destroy_workqueue(fsc->pg_inv_wq);
518 destroy_workqueue(fsc->trunc_wq);
520 bdi_destroy(&fsc->backing_dev_info);
522 mempool_destroy(fsc->wb_pagevec_pool);
524 destroy_mount_options(fsc->mount_options);
526 ceph_fs_debugfs_cleanup(fsc);
528 ceph_destroy_client(fsc->client);
531 dout("destroy_fs_client %p done\n", fsc);
537 struct kmem_cache *ceph_inode_cachep;
538 struct kmem_cache *ceph_cap_cachep;
539 struct kmem_cache *ceph_dentry_cachep;
540 struct kmem_cache *ceph_file_cachep;
542 static void ceph_inode_init_once(void *foo)
544 struct ceph_inode_info *ci = foo;
545 inode_init_once(&ci->vfs_inode);
548 static int __init init_caches(void)
550 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
551 sizeof(struct ceph_inode_info),
552 __alignof__(struct ceph_inode_info),
553 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
554 ceph_inode_init_once);
555 if (ceph_inode_cachep == NULL)
558 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
559 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
560 if (ceph_cap_cachep == NULL)
563 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
564 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
565 if (ceph_dentry_cachep == NULL)
568 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
569 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
570 if (ceph_file_cachep == NULL)
576 kmem_cache_destroy(ceph_dentry_cachep);
578 kmem_cache_destroy(ceph_cap_cachep);
580 kmem_cache_destroy(ceph_inode_cachep);
584 static void destroy_caches(void)
586 kmem_cache_destroy(ceph_inode_cachep);
587 kmem_cache_destroy(ceph_cap_cachep);
588 kmem_cache_destroy(ceph_dentry_cachep);
589 kmem_cache_destroy(ceph_file_cachep);
594 * ceph_umount_begin - initiate forced umount. Tear down down the
595 * mount, skipping steps that may hang while waiting for server(s).
597 static void ceph_umount_begin(struct super_block *sb)
599 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
601 dout("ceph_umount_begin - starting forced umount\n");
604 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
608 static const struct super_operations ceph_super_ops = {
609 .alloc_inode = ceph_alloc_inode,
610 .destroy_inode = ceph_destroy_inode,
611 .write_inode = ceph_write_inode,
612 .sync_fs = ceph_sync_fs,
613 .put_super = ceph_put_super,
614 .show_options = ceph_show_options,
615 .statfs = ceph_statfs,
616 .umount_begin = ceph_umount_begin,
620 * Bootstrap mount by opening the root directory. Note the mount
621 * @started time from caller, and time out if this takes too long.
623 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
625 unsigned long started)
627 struct ceph_mds_client *mdsc = fsc->mdsc;
628 struct ceph_mds_request *req = NULL;
633 dout("open_root_inode opening '%s'\n", path);
634 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
636 return ERR_CAST(req);
637 req->r_path1 = kstrdup(path, GFP_NOFS);
638 req->r_ino1.ino = CEPH_INO_ROOT;
639 req->r_ino1.snap = CEPH_NOSNAP;
640 req->r_started = started;
641 req->r_timeout = fsc->client->options->mount_timeout * HZ;
642 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
644 err = ceph_mdsc_do_request(mdsc, NULL, req);
646 dout("open_root_inode success\n");
647 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
648 fsc->sb->s_root == NULL) {
649 root = d_alloc_root(req->r_target_inode);
650 ceph_init_dentry(root);
652 root = d_obtain_alias(req->r_target_inode);
654 req->r_target_inode = NULL;
655 dout("open_root_inode success, root dentry is %p\n", root);
659 ceph_mdsc_put_request(req);
667 * mount: join the ceph cluster, and open root directory.
669 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
673 unsigned long started = jiffies; /* note the start time */
675 int first = 0; /* first vfsmount for this super_block */
677 dout("mount start\n");
678 mutex_lock(&fsc->client->mount_mutex);
680 err = __ceph_open_session(fsc->client, started);
684 dout("mount opening root\n");
685 root = open_root_dentry(fsc, "", started);
690 if (fsc->sb->s_root) {
693 fsc->sb->s_root = root;
696 err = ceph_fs_debugfs_init(fsc);
704 dout("mount opening base mountpoint\n");
705 root = open_root_dentry(fsc, path, started);
712 fsc->mount_state = CEPH_MOUNT_MOUNTED;
713 dout("mount success\n");
714 mutex_unlock(&fsc->client->mount_mutex);
718 mutex_unlock(&fsc->client->mount_mutex);
723 dput(fsc->sb->s_root);
724 fsc->sb->s_root = NULL;
729 static int ceph_set_super(struct super_block *s, void *data)
731 struct ceph_fs_client *fsc = data;
734 dout("set_super %p data %p\n", s, data);
736 s->s_flags = fsc->mount_options->sb_flags;
737 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
742 s->s_op = &ceph_super_ops;
743 s->s_export_op = &ceph_export_ops;
745 s->s_time_gran = 1000; /* 1000 ns == 1 us */
747 ret = set_anon_super(s, NULL); /* what is that second arg for? */
760 * share superblock if same fs AND options
762 static int ceph_compare_super(struct super_block *sb, void *data)
764 struct ceph_fs_client *new = data;
765 struct ceph_mount_options *fsopt = new->mount_options;
766 struct ceph_options *opt = new->client->options;
767 struct ceph_fs_client *other = ceph_sb_to_client(sb);
769 dout("ceph_compare_super %p\n", sb);
771 if (compare_mount_options(fsopt, opt, other)) {
772 dout("monitor(s)/mount options don't match\n");
775 if ((opt->flags & CEPH_OPT_FSID) &&
776 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
777 dout("fsid doesn't match\n");
780 if (fsopt->sb_flags != other->mount_options->sb_flags) {
781 dout("flags differ\n");
788 * construct our own bdi so we can control readahead, etc.
790 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
792 static int ceph_register_bdi(struct super_block *sb,
793 struct ceph_fs_client *fsc)
797 /* set ra_pages based on rasize mount option? */
798 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
799 fsc->backing_dev_info.ra_pages =
800 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
803 fsc->backing_dev_info.ra_pages =
804 default_backing_dev_info.ra_pages;
806 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d",
807 atomic_long_inc_return(&bdi_seq));
809 sb->s_bdi = &fsc->backing_dev_info;
813 static struct dentry *ceph_mount(struct file_system_type *fs_type,
814 int flags, const char *dev_name, void *data)
816 struct super_block *sb;
817 struct ceph_fs_client *fsc;
820 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
821 const char *path = NULL;
822 struct ceph_mount_options *fsopt = NULL;
823 struct ceph_options *opt = NULL;
825 dout("ceph_mount\n");
826 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
832 /* create client (which we may/may not use) */
833 fsc = create_fs_client(fsopt, opt);
836 destroy_mount_options(fsopt);
837 ceph_destroy_options(opt);
841 err = ceph_mdsc_init(fsc);
847 if (ceph_test_opt(fsc->client, NOSHARE))
848 compare_super = NULL;
849 sb = sget(fs_type, compare_super, ceph_set_super, fsc);
855 if (ceph_sb_to_client(sb) != fsc) {
856 ceph_mdsc_destroy(fsc);
857 destroy_fs_client(fsc);
858 fsc = ceph_sb_to_client(sb);
859 dout("get_sb got existing client %p\n", fsc);
861 dout("get_sb using new client %p\n", fsc);
862 err = ceph_register_bdi(sb, fsc);
869 res = ceph_real_mount(fsc, path);
872 dout("root %p inode %p ino %llx.%llx\n", res,
873 res->d_inode, ceph_vinop(res->d_inode));
877 ceph_mdsc_close_sessions(fsc->mdsc);
878 deactivate_locked_super(sb);
882 ceph_mdsc_destroy(fsc);
883 destroy_fs_client(fsc);
885 dout("ceph_mount fail %ld\n", PTR_ERR(res));
889 static void ceph_kill_sb(struct super_block *s)
891 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
892 dout("kill_sb %p\n", s);
893 ceph_mdsc_pre_umount(fsc->mdsc);
894 kill_anon_super(s); /* will call put_super after sb is r/o */
895 ceph_mdsc_destroy(fsc);
896 destroy_fs_client(fsc);
899 static struct file_system_type ceph_fs_type = {
900 .owner = THIS_MODULE,
903 .kill_sb = ceph_kill_sb,
904 .fs_flags = FS_RENAME_DOES_D_MOVE,
907 #define _STRINGIFY(x) #x
908 #define STRINGIFY(x) _STRINGIFY(x)
910 static int __init init_ceph(void)
912 int ret = init_caches();
916 ret = ceph_snap_init();
920 ret = register_filesystem(&ceph_fs_type);
924 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
936 static void __exit exit_ceph(void)
939 unregister_filesystem(&ceph_fs_type);
944 module_init(init_ceph);
945 module_exit(exit_ceph);
947 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
948 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
949 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
950 MODULE_DESCRIPTION("Ceph filesystem for Linux");
951 MODULE_LICENSE("GPL");