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1
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/backing-dev.h>
5#include <linux/ctype.h>
6#include <linux/fs.h>
7#include <linux/inet.h>
8#include <linux/in6.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>
17
18#include "super.h"
19#include "mds_client.h"
20
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>
25
26/*
27 * Ceph superblock operations
28 *
29 * Handle the basics of mounting, unmounting.
30 */
31
32/*
33 * super ops
34 */
35static void ceph_put_super(struct super_block *s)
36{
37 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
38
39 dout("put_super\n");
40 ceph_mdsc_close_sessions(fsc->mdsc);
41
42 /*
43 * ensure we release the bdi before put_anon_super releases
44 * the device name.
45 */
46 if (s->s_bdi == &fsc->backing_dev_info) {
47 bdi_unregister(&fsc->backing_dev_info);
48 s->s_bdi = NULL;
49 }
50
51 return;
52}
53
54static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
55{
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;
59 u64 fsid;
60 int err;
61
62 dout("statfs\n");
63 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
64 if (err < 0)
65 return err;
66
67 /* fill in kstatfs */
68 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
69
70 /*
71 * express utilization in terms of large blocks to avoid
72 * overflow on 32-bit machines.
73 */
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);
78
79 buf->f_files = le64_to_cpu(st.num_objects);
80 buf->f_ffree = -1;
81 buf->f_namelen = NAME_MAX;
82 buf->f_frsize = PAGE_CACHE_SIZE;
83
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;
88
89 return 0;
90}
91
92
93static int ceph_sync_fs(struct super_block *sb, int wait)
94{
95 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
96
97 if (!wait) {
98 dout("sync_fs (non-blocking)\n");
99 ceph_flush_dirty_caps(fsc->mdsc);
100 dout("sync_fs (non-blocking) done\n");
101 return 0;
102 }
103
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");
108 return 0;
109}
110
111/*
112 * mount options
113 */
114enum {
115 Opt_wsize,
116 Opt_rsize,
117 Opt_caps_wanted_delay_min,
118 Opt_caps_wanted_delay_max,
119 Opt_cap_release_safety,
120 Opt_readdir_max_entries,
121 Opt_readdir_max_bytes,
122 Opt_congestion_kb,
123 Opt_last_int,
124 /* int args above */
125 Opt_snapdirname,
126 Opt_last_string,
127 /* string args above */
128 Opt_dirstat,
129 Opt_nodirstat,
130 Opt_rbytes,
131 Opt_norbytes,
132 Opt_noasyncreaddir,
133 Opt_ino32,
134};
135
136static match_table_t fsopt_tokens = {
137 {Opt_wsize, "wsize=%d"},
138 {Opt_rsize, "rsize=%d"},
139 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
140 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
141 {Opt_cap_release_safety, "cap_release_safety=%d"},
142 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
143 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
144 {Opt_congestion_kb, "write_congestion_kb=%d"},
145 /* int args above */
146 {Opt_snapdirname, "snapdirname=%s"},
147 /* string args above */
148 {Opt_dirstat, "dirstat"},
149 {Opt_nodirstat, "nodirstat"},
150 {Opt_rbytes, "rbytes"},
151 {Opt_norbytes, "norbytes"},
152 {Opt_noasyncreaddir, "noasyncreaddir"},
153 {Opt_ino32, "ino32"},
154 {-1, NULL}
155};
156
157static int parse_fsopt_token(char *c, void *private)
158{
159 struct ceph_mount_options *fsopt = private;
160 substring_t argstr[MAX_OPT_ARGS];
161 int token, intval, ret;
162
163 token = match_token((char *)c, fsopt_tokens, argstr);
164 if (token < 0)
165 return -EINVAL;
166
167 if (token < Opt_last_int) {
168 ret = match_int(&argstr[0], &intval);
169 if (ret < 0) {
170 pr_err("bad mount option arg (not int) "
171 "at '%s'\n", c);
172 return ret;
173 }
174 dout("got int token %d val %d\n", token, intval);
175 } else if (token > Opt_last_int && token < Opt_last_string) {
176 dout("got string token %d val %s\n", token,
177 argstr[0].from);
178 } else {
179 dout("got token %d\n", token);
180 }
181
182 switch (token) {
183 case Opt_snapdirname:
184 kfree(fsopt->snapdir_name);
185 fsopt->snapdir_name = kstrndup(argstr[0].from,
186 argstr[0].to-argstr[0].from,
187 GFP_KERNEL);
188 if (!fsopt->snapdir_name)
189 return -ENOMEM;
190 break;
191
192 /* misc */
193 case Opt_wsize:
194 fsopt->wsize = intval;
195 break;
196 case Opt_rsize:
197 fsopt->rsize = intval;
198 break;
199 case Opt_caps_wanted_delay_min:
200 fsopt->caps_wanted_delay_min = intval;
201 break;
202 case Opt_caps_wanted_delay_max:
203 fsopt->caps_wanted_delay_max = intval;
204 break;
205 case Opt_readdir_max_entries:
206 fsopt->max_readdir = intval;
207 break;
208 case Opt_readdir_max_bytes:
209 fsopt->max_readdir_bytes = intval;
210 break;
211 case Opt_congestion_kb:
212 fsopt->congestion_kb = intval;
213 break;
214 case Opt_dirstat:
215 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
216 break;
217 case Opt_nodirstat:
218 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
219 break;
220 case Opt_rbytes:
221 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
222 break;
223 case Opt_norbytes:
224 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
225 break;
226 case Opt_noasyncreaddir:
227 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
228 break;
229 case Opt_ino32:
230 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
231 break;
232 default:
233 BUG_ON(token);
234 }
235 return 0;
236}
237
238static void destroy_mount_options(struct ceph_mount_options *args)
239{
240 dout("destroy_mount_options %p\n", args);
241 kfree(args->snapdir_name);
242 kfree(args);
243}
244
245static int strcmp_null(const char *s1, const char *s2)
246{
247 if (!s1 && !s2)
248 return 0;
249 if (s1 && !s2)
250 return -1;
251 if (!s1 && s2)
252 return 1;
253 return strcmp(s1, s2);
254}
255
256static int compare_mount_options(struct ceph_mount_options *new_fsopt,
257 struct ceph_options *new_opt,
258 struct ceph_fs_client *fsc)
259{
260 struct ceph_mount_options *fsopt1 = new_fsopt;
261 struct ceph_mount_options *fsopt2 = fsc->mount_options;
262 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
263 int ret;
264
265 ret = memcmp(fsopt1, fsopt2, ofs);
266 if (ret)
267 return ret;
268
269 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
270 if (ret)
271 return ret;
272
273 return ceph_compare_options(new_opt, fsc->client);
274}
275
276static int parse_mount_options(struct ceph_mount_options **pfsopt,
277 struct ceph_options **popt,
278 int flags, char *options,
279 const char *dev_name,
280 const char **path)
281{
282 struct ceph_mount_options *fsopt;
283 const char *dev_name_end;
284 int err = -ENOMEM;
285
286 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
287 if (!fsopt)
288 return -ENOMEM;
289
290 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
291
292 fsopt->sb_flags = flags;
293 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
294
295 fsopt->rsize = CEPH_RSIZE_DEFAULT;
296 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
297 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
298 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
299 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
300 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
301 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
302 fsopt->congestion_kb = default_congestion_kb();
303
304 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
305 err = -EINVAL;
306 if (!dev_name)
307 goto out;
308 *path = strstr(dev_name, ":/");
309 if (*path == NULL) {
310 pr_err("device name is missing path (no :/ in %s)\n",
311 dev_name);
312 goto out;
313 }
314 dev_name_end = *path;
315 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
316
317 /* path on server */
318 *path += 2;
319 dout("server path '%s'\n", *path);
320
321 err = ceph_parse_options(popt, options, dev_name, dev_name_end,
322 parse_fsopt_token, (void *)fsopt);
323 if (err)
324 goto out;
325
326 /* success */
327 *pfsopt = fsopt;
328 return 0;
329
330out:
331 destroy_mount_options(fsopt);
332 return err;
333}
334
335/**
336 * ceph_show_options - Show mount options in /proc/mounts
337 * @m: seq_file to write to
338 * @mnt: mount descriptor
339 */
340static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
341{
342 struct ceph_fs_client *fsc = ceph_sb_to_client(mnt->mnt_sb);
343 struct ceph_mount_options *fsopt = fsc->mount_options;
344 struct ceph_options *opt = fsc->client->options;
345
346 if (opt->flags & CEPH_OPT_FSID)
347 seq_printf(m, ",fsid=%pU", &opt->fsid);
348 if (opt->flags & CEPH_OPT_NOSHARE)
349 seq_puts(m, ",noshare");
350 if (opt->flags & CEPH_OPT_NOCRC)
351 seq_puts(m, ",nocrc");
352
353 if (opt->name)
354 seq_printf(m, ",name=%s", opt->name);
355 if (opt->key)
356 seq_puts(m, ",secret=<hidden>");
357
358 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
359 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
360 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
361 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
362 if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
363 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout);
364 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
365 seq_printf(m, ",osdkeepalivetimeout=%d",
366 opt->osd_keepalive_timeout);
367
368 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
369 seq_puts(m, ",dirstat");
370 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
371 seq_puts(m, ",norbytes");
372 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
373 seq_puts(m, ",noasyncreaddir");
374
375 if (fsopt->wsize)
376 seq_printf(m, ",wsize=%d", fsopt->wsize);
377 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
378 seq_printf(m, ",rsize=%d", fsopt->rsize);
379 if (fsopt->congestion_kb != default_congestion_kb())
380 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
381 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
382 seq_printf(m, ",caps_wanted_delay_min=%d",
383 fsopt->caps_wanted_delay_min);
384 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
385 seq_printf(m, ",caps_wanted_delay_max=%d",
386 fsopt->caps_wanted_delay_max);
387 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
388 seq_printf(m, ",cap_release_safety=%d",
389 fsopt->cap_release_safety);
390 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
391 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
392 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
393 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
394 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
395 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
396 return 0;
397}
398
399/*
400 * handle any mon messages the standard library doesn't understand.
401 * return error if we don't either.
402 */
403static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
404{
405 struct ceph_fs_client *fsc = client->private;
406 int type = le16_to_cpu(msg->hdr.type);
407
408 switch (type) {
409 case CEPH_MSG_MDS_MAP:
410 ceph_mdsc_handle_map(fsc->mdsc, msg);
411 return 0;
412
413 default:
414 return -1;
415 }
416}
417
418/*
419 * create a new fs client
420 */
421struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
422 struct ceph_options *opt)
423{
424 struct ceph_fs_client *fsc;
425 int err = -ENOMEM;
426
427 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
428 if (!fsc)
429 return ERR_PTR(-ENOMEM);
430
431 fsc->client = ceph_create_client(opt, fsc);
432 if (IS_ERR(fsc->client)) {
433 err = PTR_ERR(fsc->client);
434 goto fail;
435 }
436 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
437 fsc->client->supported_features |= CEPH_FEATURE_FLOCK |
438 CEPH_FEATURE_DIRLAYOUTHASH;
439 fsc->client->monc.want_mdsmap = 1;
440
441 fsc->mount_options = fsopt;
442
443 fsc->sb = NULL;
444 fsc->mount_state = CEPH_MOUNT_MOUNTING;
445
446 atomic_long_set(&fsc->writeback_count, 0);
447
448 err = bdi_init(&fsc->backing_dev_info);
449 if (err < 0)
450 goto fail_client;
451
452 err = -ENOMEM;
453 /*
454 * The number of concurrent works can be high but they don't need
455 * to be processed in parallel, limit concurrency.
456 */
457 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
458 if (fsc->wb_wq == NULL)
459 goto fail_bdi;
460 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
461 if (fsc->pg_inv_wq == NULL)
462 goto fail_wb_wq;
463 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
464 if (fsc->trunc_wq == NULL)
465 goto fail_pg_inv_wq;
466
467 /* set up mempools */
468 err = -ENOMEM;
469 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
470 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
471 if (!fsc->wb_pagevec_pool)
472 goto fail_trunc_wq;
473
474 /* caps */
475 fsc->min_caps = fsopt->max_readdir;
476
477 return fsc;
478
479fail_trunc_wq:
480 destroy_workqueue(fsc->trunc_wq);
481fail_pg_inv_wq:
482 destroy_workqueue(fsc->pg_inv_wq);
483fail_wb_wq:
484 destroy_workqueue(fsc->wb_wq);
485fail_bdi:
486 bdi_destroy(&fsc->backing_dev_info);
487fail_client:
488 ceph_destroy_client(fsc->client);
489fail:
490 kfree(fsc);
491 return ERR_PTR(err);
492}
493
494void destroy_fs_client(struct ceph_fs_client *fsc)
495{
496 dout("destroy_fs_client %p\n", fsc);
497
498 destroy_workqueue(fsc->wb_wq);
499 destroy_workqueue(fsc->pg_inv_wq);
500 destroy_workqueue(fsc->trunc_wq);
501
502 bdi_destroy(&fsc->backing_dev_info);
503
504 mempool_destroy(fsc->wb_pagevec_pool);
505
506 destroy_mount_options(fsc->mount_options);
507
508 ceph_fs_debugfs_cleanup(fsc);
509
510 ceph_destroy_client(fsc->client);
511
512 kfree(fsc);
513 dout("destroy_fs_client %p done\n", fsc);
514}
515
516/*
517 * caches
518 */
519struct kmem_cache *ceph_inode_cachep;
520struct kmem_cache *ceph_cap_cachep;
521struct kmem_cache *ceph_dentry_cachep;
522struct kmem_cache *ceph_file_cachep;
523
524static void ceph_inode_init_once(void *foo)
525{
526 struct ceph_inode_info *ci = foo;
527 inode_init_once(&ci->vfs_inode);
528}
529
530static int __init init_caches(void)
531{
532 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
533 sizeof(struct ceph_inode_info),
534 __alignof__(struct ceph_inode_info),
535 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
536 ceph_inode_init_once);
537 if (ceph_inode_cachep == NULL)
538 return -ENOMEM;
539
540 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
541 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
542 if (ceph_cap_cachep == NULL)
543 goto bad_cap;
544
545 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
546 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
547 if (ceph_dentry_cachep == NULL)
548 goto bad_dentry;
549
550 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
551 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
552 if (ceph_file_cachep == NULL)
553 goto bad_file;
554
555 return 0;
556
557bad_file:
558 kmem_cache_destroy(ceph_dentry_cachep);
559bad_dentry:
560 kmem_cache_destroy(ceph_cap_cachep);
561bad_cap:
562 kmem_cache_destroy(ceph_inode_cachep);
563 return -ENOMEM;
564}
565
566static void destroy_caches(void)
567{
568 kmem_cache_destroy(ceph_inode_cachep);
569 kmem_cache_destroy(ceph_cap_cachep);
570 kmem_cache_destroy(ceph_dentry_cachep);
571 kmem_cache_destroy(ceph_file_cachep);
572}
573
574
575/*
576 * ceph_umount_begin - initiate forced umount. Tear down down the
577 * mount, skipping steps that may hang while waiting for server(s).
578 */
579static void ceph_umount_begin(struct super_block *sb)
580{
581 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
582
583 dout("ceph_umount_begin - starting forced umount\n");
584 if (!fsc)
585 return;
586 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
587 return;
588}
589
590static const struct super_operations ceph_super_ops = {
591 .alloc_inode = ceph_alloc_inode,
592 .destroy_inode = ceph_destroy_inode,
593 .write_inode = ceph_write_inode,
594 .sync_fs = ceph_sync_fs,
595 .put_super = ceph_put_super,
596 .show_options = ceph_show_options,
597 .statfs = ceph_statfs,
598 .umount_begin = ceph_umount_begin,
599};
600
601/*
602 * Bootstrap mount by opening the root directory. Note the mount
603 * @started time from caller, and time out if this takes too long.
604 */
605static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
606 const char *path,
607 unsigned long started)
608{
609 struct ceph_mds_client *mdsc = fsc->mdsc;
610 struct ceph_mds_request *req = NULL;
611 int err;
612 struct dentry *root;
613
614 /* open dir */
615 dout("open_root_inode opening '%s'\n", path);
616 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
617 if (IS_ERR(req))
618 return ERR_CAST(req);
619 req->r_path1 = kstrdup(path, GFP_NOFS);
620 req->r_ino1.ino = CEPH_INO_ROOT;
621 req->r_ino1.snap = CEPH_NOSNAP;
622 req->r_started = started;
623 req->r_timeout = fsc->client->options->mount_timeout * HZ;
624 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
625 req->r_num_caps = 2;
626 err = ceph_mdsc_do_request(mdsc, NULL, req);
627 if (err == 0) {
628 dout("open_root_inode success\n");
629 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
630 fsc->sb->s_root == NULL)
631 root = d_alloc_root(req->r_target_inode);
632 else
633 root = d_obtain_alias(req->r_target_inode);
634 req->r_target_inode = NULL;
635 dout("open_root_inode success, root dentry is %p\n", root);
636 } else {
637 root = ERR_PTR(err);
638 }
639 ceph_mdsc_put_request(req);
640 return root;
641}
642
643
644
645
646/*
647 * mount: join the ceph cluster, and open root directory.
648 */
649static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
650 const char *path)
651{
652 int err;
653 unsigned long started = jiffies; /* note the start time */
654 struct dentry *root;
655 int first = 0; /* first vfsmount for this super_block */
656
657 dout("mount start\n");
658 mutex_lock(&fsc->client->mount_mutex);
659
660 err = __ceph_open_session(fsc->client, started);
661 if (err < 0)
662 goto out;
663
664 dout("mount opening root\n");
665 root = open_root_dentry(fsc, "", started);
666 if (IS_ERR(root)) {
667 err = PTR_ERR(root);
668 goto out;
669 }
670 if (fsc->sb->s_root) {
671 dput(root);
672 } else {
673 fsc->sb->s_root = root;
674 first = 1;
675
676 err = ceph_fs_debugfs_init(fsc);
677 if (err < 0)
678 goto fail;
679 }
680
681 if (path[0] == 0) {
682 dget(root);
683 } else {
684 dout("mount opening base mountpoint\n");
685 root = open_root_dentry(fsc, path, started);
686 if (IS_ERR(root)) {
687 err = PTR_ERR(root);
688 goto fail;
689 }
690 }
691
692 fsc->mount_state = CEPH_MOUNT_MOUNTED;
693 dout("mount success\n");
694 mutex_unlock(&fsc->client->mount_mutex);
695 return root;
696
697out:
698 mutex_unlock(&fsc->client->mount_mutex);
699 return ERR_PTR(err);
700
701fail:
702 if (first) {
703 dput(fsc->sb->s_root);
704 fsc->sb->s_root = NULL;
705 }
706 goto out;
707}
708
709static int ceph_set_super(struct super_block *s, void *data)
710{
711 struct ceph_fs_client *fsc = data;
712 int ret;
713
714 dout("set_super %p data %p\n", s, data);
715
716 s->s_flags = fsc->mount_options->sb_flags;
717 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
718
719 s->s_fs_info = fsc;
720 fsc->sb = s;
721
722 s->s_op = &ceph_super_ops;
723 s->s_export_op = &ceph_export_ops;
724
725 s->s_time_gran = 1000; /* 1000 ns == 1 us */
726
727 ret = set_anon_super(s, NULL); /* what is that second arg for? */
728 if (ret != 0)
729 goto fail;
730
731 return ret;
732
733fail:
734 s->s_fs_info = NULL;
735 fsc->sb = NULL;
736 return ret;
737}
738
739/*
740 * share superblock if same fs AND options
741 */
742static int ceph_compare_super(struct super_block *sb, void *data)
743{
744 struct ceph_fs_client *new = data;
745 struct ceph_mount_options *fsopt = new->mount_options;
746 struct ceph_options *opt = new->client->options;
747 struct ceph_fs_client *other = ceph_sb_to_client(sb);
748
749 dout("ceph_compare_super %p\n", sb);
750
751 if (compare_mount_options(fsopt, opt, other)) {
752 dout("monitor(s)/mount options don't match\n");
753 return 0;
754 }
755 if ((opt->flags & CEPH_OPT_FSID) &&
756 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
757 dout("fsid doesn't match\n");
758 return 0;
759 }
760 if (fsopt->sb_flags != other->mount_options->sb_flags) {
761 dout("flags differ\n");
762 return 0;
763 }
764 return 1;
765}
766
767/*
768 * construct our own bdi so we can control readahead, etc.
769 */
770static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
771
772static int ceph_register_bdi(struct super_block *sb,
773 struct ceph_fs_client *fsc)
774{
775 int err;
776
777 /* set ra_pages based on rsize mount option? */
778 if (fsc->mount_options->rsize >= PAGE_CACHE_SIZE)
779 fsc->backing_dev_info.ra_pages =
780 (fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1)
781 >> PAGE_SHIFT;
782 else
783 fsc->backing_dev_info.ra_pages =
784 default_backing_dev_info.ra_pages;
785
786 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d",
787 atomic_long_inc_return(&bdi_seq));
788 if (!err)
789 sb->s_bdi = &fsc->backing_dev_info;
790 return err;
791}
792
793static struct dentry *ceph_mount(struct file_system_type *fs_type,
794 int flags, const char *dev_name, void *data)
795{
796 struct super_block *sb;
797 struct ceph_fs_client *fsc;
798 struct dentry *res;
799 int err;
800 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
801 const char *path = NULL;
802 struct ceph_mount_options *fsopt = NULL;
803 struct ceph_options *opt = NULL;
804
805 dout("ceph_mount\n");
806 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
807 if (err < 0) {
808 res = ERR_PTR(err);
809 goto out_final;
810 }
811
812 /* create client (which we may/may not use) */
813 fsc = create_fs_client(fsopt, opt);
814 if (IS_ERR(fsc)) {
815 res = ERR_CAST(fsc);
816 destroy_mount_options(fsopt);
817 ceph_destroy_options(opt);
818 goto out_final;
819 }
820
821 err = ceph_mdsc_init(fsc);
822 if (err < 0) {
823 res = ERR_PTR(err);
824 goto out;
825 }
826
827 if (ceph_test_opt(fsc->client, NOSHARE))
828 compare_super = NULL;
829 sb = sget(fs_type, compare_super, ceph_set_super, fsc);
830 if (IS_ERR(sb)) {
831 res = ERR_CAST(sb);
832 goto out;
833 }
834
835 if (ceph_sb_to_client(sb) != fsc) {
836 ceph_mdsc_destroy(fsc);
837 destroy_fs_client(fsc);
838 fsc = ceph_sb_to_client(sb);
839 dout("get_sb got existing client %p\n", fsc);
840 } else {
841 dout("get_sb using new client %p\n", fsc);
842 err = ceph_register_bdi(sb, fsc);
843 if (err < 0) {
844 res = ERR_PTR(err);
845 goto out_splat;
846 }
847 }
848
849 res = ceph_real_mount(fsc, path);
850 if (IS_ERR(res))
851 goto out_splat;
852 dout("root %p inode %p ino %llx.%llx\n", res,
853 res->d_inode, ceph_vinop(res->d_inode));
854 return res;
855
856out_splat:
857 ceph_mdsc_close_sessions(fsc->mdsc);
858 deactivate_locked_super(sb);
859 goto out_final;
860
861out:
862 ceph_mdsc_destroy(fsc);
863 destroy_fs_client(fsc);
864out_final:
865 dout("ceph_mount fail %ld\n", PTR_ERR(res));
866 return res;
867}
868
869static void ceph_kill_sb(struct super_block *s)
870{
871 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
872 dout("kill_sb %p\n", s);
873 ceph_mdsc_pre_umount(fsc->mdsc);
874 kill_anon_super(s); /* will call put_super after sb is r/o */
875 ceph_mdsc_destroy(fsc);
876 destroy_fs_client(fsc);
877}
878
879static struct file_system_type ceph_fs_type = {
880 .owner = THIS_MODULE,
881 .name = "ceph",
882 .mount = ceph_mount,
883 .kill_sb = ceph_kill_sb,
884 .fs_flags = FS_RENAME_DOES_D_MOVE,
885};
886
887#define _STRINGIFY(x) #x
888#define STRINGIFY(x) _STRINGIFY(x)
889
890static int __init init_ceph(void)
891{
892 int ret = init_caches();
893 if (ret)
894 goto out;
895
896 ret = register_filesystem(&ceph_fs_type);
897 if (ret)
898 goto out_icache;
899
900 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
901
902 return 0;
903
904out_icache:
905 destroy_caches();
906out:
907 return ret;
908}
909
910static void __exit exit_ceph(void)
911{
912 dout("exit_ceph\n");
913 unregister_filesystem(&ceph_fs_type);
914 destroy_caches();
915}
916
917module_init(init_ceph);
918module_exit(exit_ceph);
919
920MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
921MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
922MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
923MODULE_DESCRIPTION("Ceph filesystem for Linux");
924MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/ceph/ceph_debug.h>
4
5#include <linux/backing-dev.h>
6#include <linux/ctype.h>
7#include <linux/fs.h>
8#include <linux/inet.h>
9#include <linux/in6.h>
10#include <linux/module.h>
11#include <linux/mount.h>
12#include <linux/fs_context.h>
13#include <linux/fs_parser.h>
14#include <linux/sched.h>
15#include <linux/seq_file.h>
16#include <linux/slab.h>
17#include <linux/statfs.h>
18#include <linux/string.h>
19
20#include "super.h"
21#include "mds_client.h"
22#include "cache.h"
23#include "crypto.h"
24
25#include <linux/ceph/ceph_features.h>
26#include <linux/ceph/decode.h>
27#include <linux/ceph/mon_client.h>
28#include <linux/ceph/auth.h>
29#include <linux/ceph/debugfs.h>
30
31#include <uapi/linux/magic.h>
32
33static DEFINE_SPINLOCK(ceph_fsc_lock);
34static LIST_HEAD(ceph_fsc_list);
35
36/*
37 * Ceph superblock operations
38 *
39 * Handle the basics of mounting, unmounting.
40 */
41
42/*
43 * super ops
44 */
45static void ceph_put_super(struct super_block *s)
46{
47 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(s);
48
49 doutc(fsc->client, "begin\n");
50 ceph_fscrypt_free_dummy_policy(fsc);
51 ceph_mdsc_close_sessions(fsc->mdsc);
52 doutc(fsc->client, "done\n");
53}
54
55static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
56{
57 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(d_inode(dentry));
58 struct ceph_mon_client *monc = &fsc->client->monc;
59 struct ceph_statfs st;
60 int i, err;
61 u64 data_pool;
62
63 doutc(fsc->client, "begin\n");
64 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
65 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
66 } else {
67 data_pool = CEPH_NOPOOL;
68 }
69
70 err = ceph_monc_do_statfs(monc, data_pool, &st);
71 if (err < 0)
72 return err;
73
74 /* fill in kstatfs */
75 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
76
77 /*
78 * Express utilization in terms of large blocks to avoid
79 * overflow on 32-bit machines.
80 */
81 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
82
83 /*
84 * By default use root quota for stats; fallback to overall filesystem
85 * usage if using 'noquotadf' mount option or if the root dir doesn't
86 * have max_bytes quota set.
87 */
88 if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
89 !ceph_quota_update_statfs(fsc, buf)) {
90 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
91 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
92 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
93 }
94
95 /*
96 * NOTE: for the time being, we make bsize == frsize to humor
97 * not-yet-ancient versions of glibc that are broken.
98 * Someday, we will probably want to report a real block
99 * size... whatever that may mean for a network file system!
100 */
101 buf->f_bsize = buf->f_frsize;
102
103 buf->f_files = le64_to_cpu(st.num_objects);
104 buf->f_ffree = -1;
105 buf->f_namelen = NAME_MAX;
106
107 /* Must convert the fsid, for consistent values across arches */
108 buf->f_fsid.val[0] = 0;
109 mutex_lock(&monc->mutex);
110 for (i = 0 ; i < sizeof(monc->monmap->fsid) / sizeof(__le32) ; ++i)
111 buf->f_fsid.val[0] ^= le32_to_cpu(((__le32 *)&monc->monmap->fsid)[i]);
112 mutex_unlock(&monc->mutex);
113
114 /* fold the fs_cluster_id into the upper bits */
115 buf->f_fsid.val[1] = monc->fs_cluster_id;
116
117 doutc(fsc->client, "done\n");
118 return 0;
119}
120
121static int ceph_sync_fs(struct super_block *sb, int wait)
122{
123 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
124 struct ceph_client *cl = fsc->client;
125
126 if (!wait) {
127 doutc(cl, "(non-blocking)\n");
128 ceph_flush_dirty_caps(fsc->mdsc);
129 ceph_flush_cap_releases(fsc->mdsc);
130 doutc(cl, "(non-blocking) done\n");
131 return 0;
132 }
133
134 doutc(cl, "(blocking)\n");
135 ceph_osdc_sync(&fsc->client->osdc);
136 ceph_mdsc_sync(fsc->mdsc);
137 doutc(cl, "(blocking) done\n");
138 return 0;
139}
140
141/*
142 * mount options
143 */
144enum {
145 Opt_wsize,
146 Opt_rsize,
147 Opt_rasize,
148 Opt_caps_wanted_delay_min,
149 Opt_caps_wanted_delay_max,
150 Opt_caps_max,
151 Opt_readdir_max_entries,
152 Opt_readdir_max_bytes,
153 Opt_congestion_kb,
154 /* int args above */
155 Opt_snapdirname,
156 Opt_mds_namespace,
157 Opt_recover_session,
158 Opt_source,
159 Opt_mon_addr,
160 Opt_test_dummy_encryption,
161 /* string args above */
162 Opt_dirstat,
163 Opt_rbytes,
164 Opt_asyncreaddir,
165 Opt_dcache,
166 Opt_ino32,
167 Opt_fscache,
168 Opt_poolperm,
169 Opt_require_active_mds,
170 Opt_acl,
171 Opt_quotadf,
172 Opt_copyfrom,
173 Opt_wsync,
174 Opt_pagecache,
175 Opt_sparseread,
176};
177
178enum ceph_recover_session_mode {
179 ceph_recover_session_no,
180 ceph_recover_session_clean
181};
182
183static const struct constant_table ceph_param_recover[] = {
184 { "no", ceph_recover_session_no },
185 { "clean", ceph_recover_session_clean },
186 {}
187};
188
189static const struct fs_parameter_spec ceph_mount_parameters[] = {
190 fsparam_flag_no ("acl", Opt_acl),
191 fsparam_flag_no ("asyncreaddir", Opt_asyncreaddir),
192 fsparam_s32 ("caps_max", Opt_caps_max),
193 fsparam_u32 ("caps_wanted_delay_max", Opt_caps_wanted_delay_max),
194 fsparam_u32 ("caps_wanted_delay_min", Opt_caps_wanted_delay_min),
195 fsparam_u32 ("write_congestion_kb", Opt_congestion_kb),
196 fsparam_flag_no ("copyfrom", Opt_copyfrom),
197 fsparam_flag_no ("dcache", Opt_dcache),
198 fsparam_flag_no ("dirstat", Opt_dirstat),
199 fsparam_flag_no ("fsc", Opt_fscache), // fsc|nofsc
200 fsparam_string ("fsc", Opt_fscache), // fsc=...
201 fsparam_flag_no ("ino32", Opt_ino32),
202 fsparam_string ("mds_namespace", Opt_mds_namespace),
203 fsparam_string ("mon_addr", Opt_mon_addr),
204 fsparam_flag_no ("poolperm", Opt_poolperm),
205 fsparam_flag_no ("quotadf", Opt_quotadf),
206 fsparam_u32 ("rasize", Opt_rasize),
207 fsparam_flag_no ("rbytes", Opt_rbytes),
208 fsparam_u32 ("readdir_max_bytes", Opt_readdir_max_bytes),
209 fsparam_u32 ("readdir_max_entries", Opt_readdir_max_entries),
210 fsparam_enum ("recover_session", Opt_recover_session, ceph_param_recover),
211 fsparam_flag_no ("require_active_mds", Opt_require_active_mds),
212 fsparam_u32 ("rsize", Opt_rsize),
213 fsparam_string ("snapdirname", Opt_snapdirname),
214 fsparam_string ("source", Opt_source),
215 fsparam_flag ("test_dummy_encryption", Opt_test_dummy_encryption),
216 fsparam_string ("test_dummy_encryption", Opt_test_dummy_encryption),
217 fsparam_u32 ("wsize", Opt_wsize),
218 fsparam_flag_no ("wsync", Opt_wsync),
219 fsparam_flag_no ("pagecache", Opt_pagecache),
220 fsparam_flag_no ("sparseread", Opt_sparseread),
221 {}
222};
223
224struct ceph_parse_opts_ctx {
225 struct ceph_options *copts;
226 struct ceph_mount_options *opts;
227};
228
229/*
230 * Remove adjacent slashes and then the trailing slash, unless it is
231 * the only remaining character.
232 *
233 * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
234 */
235static void canonicalize_path(char *path)
236{
237 int i, j = 0;
238
239 for (i = 0; path[i] != '\0'; i++) {
240 if (path[i] != '/' || j < 1 || path[j - 1] != '/')
241 path[j++] = path[i];
242 }
243
244 if (j > 1 && path[j - 1] == '/')
245 j--;
246 path[j] = '\0';
247}
248
249/*
250 * Check if the mds namespace in ceph_mount_options matches
251 * the passed in namespace string. First time match (when
252 * ->mds_namespace is NULL) is treated specially, since
253 * ->mds_namespace needs to be initialized by the caller.
254 */
255static int namespace_equals(struct ceph_mount_options *fsopt,
256 const char *namespace, size_t len)
257{
258 return !(fsopt->mds_namespace &&
259 (strlen(fsopt->mds_namespace) != len ||
260 strncmp(fsopt->mds_namespace, namespace, len)));
261}
262
263static int ceph_parse_old_source(const char *dev_name, const char *dev_name_end,
264 struct fs_context *fc)
265{
266 int r;
267 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
268 struct ceph_mount_options *fsopt = pctx->opts;
269
270 if (*dev_name_end != ':')
271 return invalfc(fc, "separator ':' missing in source");
272
273 r = ceph_parse_mon_ips(dev_name, dev_name_end - dev_name,
274 pctx->copts, fc->log.log, ',');
275 if (r)
276 return r;
277
278 fsopt->new_dev_syntax = false;
279 return 0;
280}
281
282static int ceph_parse_new_source(const char *dev_name, const char *dev_name_end,
283 struct fs_context *fc)
284{
285 size_t len;
286 struct ceph_fsid fsid;
287 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
288 struct ceph_options *opts = pctx->copts;
289 struct ceph_mount_options *fsopt = pctx->opts;
290 const char *name_start = dev_name;
291 const char *fsid_start, *fs_name_start;
292
293 if (*dev_name_end != '=') {
294 dout("separator '=' missing in source");
295 return -EINVAL;
296 }
297
298 fsid_start = strchr(dev_name, '@');
299 if (!fsid_start)
300 return invalfc(fc, "missing cluster fsid");
301 len = fsid_start - name_start;
302 kfree(opts->name);
303 opts->name = kstrndup(name_start, len, GFP_KERNEL);
304 if (!opts->name)
305 return -ENOMEM;
306 dout("using %s entity name", opts->name);
307
308 ++fsid_start; /* start of cluster fsid */
309 fs_name_start = strchr(fsid_start, '.');
310 if (!fs_name_start)
311 return invalfc(fc, "missing file system name");
312
313 if (ceph_parse_fsid(fsid_start, &fsid))
314 return invalfc(fc, "Invalid FSID");
315
316 ++fs_name_start; /* start of file system name */
317 len = dev_name_end - fs_name_start;
318
319 if (!namespace_equals(fsopt, fs_name_start, len))
320 return invalfc(fc, "Mismatching mds_namespace");
321 kfree(fsopt->mds_namespace);
322 fsopt->mds_namespace = kstrndup(fs_name_start, len, GFP_KERNEL);
323 if (!fsopt->mds_namespace)
324 return -ENOMEM;
325 dout("file system (mds namespace) '%s'\n", fsopt->mds_namespace);
326
327 fsopt->new_dev_syntax = true;
328 return 0;
329}
330
331/*
332 * Parse the source parameter for new device format. Distinguish the device
333 * spec from the path. Try parsing new device format and fallback to old
334 * format if needed.
335 *
336 * New device syntax will looks like:
337 * <device_spec>=/<path>
338 * where
339 * <device_spec> is name@fsid.fsname
340 * <path> is optional, but if present must begin with '/'
341 * (monitor addresses are passed via mount option)
342 *
343 * Old device syntax is:
344 * <server_spec>[,<server_spec>...]:[<path>]
345 * where
346 * <server_spec> is <ip>[:<port>]
347 * <path> is optional, but if present must begin with '/'
348 */
349static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
350{
351 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
352 struct ceph_mount_options *fsopt = pctx->opts;
353 char *dev_name = param->string, *dev_name_end;
354 int ret;
355
356 dout("'%s'\n", dev_name);
357 if (!dev_name || !*dev_name)
358 return invalfc(fc, "Empty source");
359
360 dev_name_end = strchr(dev_name, '/');
361 if (dev_name_end) {
362 /*
363 * The server_path will include the whole chars from userland
364 * including the leading '/'.
365 */
366 kfree(fsopt->server_path);
367 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
368 if (!fsopt->server_path)
369 return -ENOMEM;
370
371 canonicalize_path(fsopt->server_path);
372 } else {
373 dev_name_end = dev_name + strlen(dev_name);
374 }
375
376 dev_name_end--; /* back up to separator */
377 if (dev_name_end < dev_name)
378 return invalfc(fc, "Path missing in source");
379
380 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
381 if (fsopt->server_path)
382 dout("server path '%s'\n", fsopt->server_path);
383
384 dout("trying new device syntax");
385 ret = ceph_parse_new_source(dev_name, dev_name_end, fc);
386 if (ret) {
387 if (ret != -EINVAL)
388 return ret;
389 dout("trying old device syntax");
390 ret = ceph_parse_old_source(dev_name, dev_name_end, fc);
391 if (ret)
392 return ret;
393 }
394
395 fc->source = param->string;
396 param->string = NULL;
397 return 0;
398}
399
400static int ceph_parse_mon_addr(struct fs_parameter *param,
401 struct fs_context *fc)
402{
403 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
404 struct ceph_mount_options *fsopt = pctx->opts;
405
406 kfree(fsopt->mon_addr);
407 fsopt->mon_addr = param->string;
408 param->string = NULL;
409
410 return ceph_parse_mon_ips(fsopt->mon_addr, strlen(fsopt->mon_addr),
411 pctx->copts, fc->log.log, '/');
412}
413
414static int ceph_parse_mount_param(struct fs_context *fc,
415 struct fs_parameter *param)
416{
417 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
418 struct ceph_mount_options *fsopt = pctx->opts;
419 struct fs_parse_result result;
420 unsigned int mode;
421 int token, ret;
422
423 ret = ceph_parse_param(param, pctx->copts, fc->log.log);
424 if (ret != -ENOPARAM)
425 return ret;
426
427 token = fs_parse(fc, ceph_mount_parameters, param, &result);
428 dout("%s: fs_parse '%s' token %d\n",__func__, param->key, token);
429 if (token < 0)
430 return token;
431
432 switch (token) {
433 case Opt_snapdirname:
434 if (strlen(param->string) > NAME_MAX)
435 return invalfc(fc, "snapdirname too long");
436 kfree(fsopt->snapdir_name);
437 fsopt->snapdir_name = param->string;
438 param->string = NULL;
439 break;
440 case Opt_mds_namespace:
441 if (!namespace_equals(fsopt, param->string, strlen(param->string)))
442 return invalfc(fc, "Mismatching mds_namespace");
443 kfree(fsopt->mds_namespace);
444 fsopt->mds_namespace = param->string;
445 param->string = NULL;
446 break;
447 case Opt_recover_session:
448 mode = result.uint_32;
449 if (mode == ceph_recover_session_no)
450 fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
451 else if (mode == ceph_recover_session_clean)
452 fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
453 else
454 BUG();
455 break;
456 case Opt_source:
457 if (fc->source)
458 return invalfc(fc, "Multiple sources specified");
459 return ceph_parse_source(param, fc);
460 case Opt_mon_addr:
461 return ceph_parse_mon_addr(param, fc);
462 case Opt_wsize:
463 if (result.uint_32 < PAGE_SIZE ||
464 result.uint_32 > CEPH_MAX_WRITE_SIZE)
465 goto out_of_range;
466 fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
467 break;
468 case Opt_rsize:
469 if (result.uint_32 < PAGE_SIZE ||
470 result.uint_32 > CEPH_MAX_READ_SIZE)
471 goto out_of_range;
472 fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
473 break;
474 case Opt_rasize:
475 fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
476 break;
477 case Opt_caps_wanted_delay_min:
478 if (result.uint_32 < 1)
479 goto out_of_range;
480 fsopt->caps_wanted_delay_min = result.uint_32;
481 break;
482 case Opt_caps_wanted_delay_max:
483 if (result.uint_32 < 1)
484 goto out_of_range;
485 fsopt->caps_wanted_delay_max = result.uint_32;
486 break;
487 case Opt_caps_max:
488 if (result.int_32 < 0)
489 goto out_of_range;
490 fsopt->caps_max = result.int_32;
491 break;
492 case Opt_readdir_max_entries:
493 if (result.uint_32 < 1)
494 goto out_of_range;
495 fsopt->max_readdir = result.uint_32;
496 break;
497 case Opt_readdir_max_bytes:
498 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
499 goto out_of_range;
500 fsopt->max_readdir_bytes = result.uint_32;
501 break;
502 case Opt_congestion_kb:
503 if (result.uint_32 < 1024) /* at least 1M */
504 goto out_of_range;
505 fsopt->congestion_kb = result.uint_32;
506 break;
507 case Opt_dirstat:
508 if (!result.negated)
509 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
510 else
511 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
512 break;
513 case Opt_rbytes:
514 if (!result.negated)
515 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
516 else
517 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
518 break;
519 case Opt_asyncreaddir:
520 if (!result.negated)
521 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
522 else
523 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
524 break;
525 case Opt_dcache:
526 if (!result.negated)
527 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
528 else
529 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
530 break;
531 case Opt_ino32:
532 if (!result.negated)
533 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
534 else
535 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
536 break;
537
538 case Opt_fscache:
539#ifdef CONFIG_CEPH_FSCACHE
540 kfree(fsopt->fscache_uniq);
541 fsopt->fscache_uniq = NULL;
542 if (result.negated) {
543 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
544 } else {
545 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
546 fsopt->fscache_uniq = param->string;
547 param->string = NULL;
548 }
549 break;
550#else
551 return invalfc(fc, "fscache support is disabled");
552#endif
553 case Opt_poolperm:
554 if (!result.negated)
555 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
556 else
557 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
558 break;
559 case Opt_require_active_mds:
560 if (!result.negated)
561 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
562 else
563 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
564 break;
565 case Opt_quotadf:
566 if (!result.negated)
567 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
568 else
569 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
570 break;
571 case Opt_copyfrom:
572 if (!result.negated)
573 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
574 else
575 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
576 break;
577 case Opt_acl:
578 if (!result.negated) {
579#ifdef CONFIG_CEPH_FS_POSIX_ACL
580 fc->sb_flags |= SB_POSIXACL;
581#else
582 return invalfc(fc, "POSIX ACL support is disabled");
583#endif
584 } else {
585 fc->sb_flags &= ~SB_POSIXACL;
586 }
587 break;
588 case Opt_wsync:
589 if (!result.negated)
590 fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
591 else
592 fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
593 break;
594 case Opt_pagecache:
595 if (result.negated)
596 fsopt->flags |= CEPH_MOUNT_OPT_NOPAGECACHE;
597 else
598 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPAGECACHE;
599 break;
600 case Opt_sparseread:
601 if (result.negated)
602 fsopt->flags &= ~CEPH_MOUNT_OPT_SPARSEREAD;
603 else
604 fsopt->flags |= CEPH_MOUNT_OPT_SPARSEREAD;
605 break;
606 case Opt_test_dummy_encryption:
607#ifdef CONFIG_FS_ENCRYPTION
608 fscrypt_free_dummy_policy(&fsopt->dummy_enc_policy);
609 ret = fscrypt_parse_test_dummy_encryption(param,
610 &fsopt->dummy_enc_policy);
611 if (ret == -EINVAL) {
612 warnfc(fc, "Value of option \"%s\" is unrecognized",
613 param->key);
614 } else if (ret == -EEXIST) {
615 warnfc(fc, "Conflicting test_dummy_encryption options");
616 ret = -EINVAL;
617 }
618#else
619 warnfc(fc,
620 "FS encryption not supported: test_dummy_encryption mount option ignored");
621#endif
622 break;
623 default:
624 BUG();
625 }
626 return 0;
627
628out_of_range:
629 return invalfc(fc, "%s out of range", param->key);
630}
631
632static void destroy_mount_options(struct ceph_mount_options *args)
633{
634 dout("destroy_mount_options %p\n", args);
635 if (!args)
636 return;
637
638 kfree(args->snapdir_name);
639 kfree(args->mds_namespace);
640 kfree(args->server_path);
641 kfree(args->fscache_uniq);
642 kfree(args->mon_addr);
643 fscrypt_free_dummy_policy(&args->dummy_enc_policy);
644 kfree(args);
645}
646
647static int strcmp_null(const char *s1, const char *s2)
648{
649 if (!s1 && !s2)
650 return 0;
651 if (s1 && !s2)
652 return -1;
653 if (!s1 && s2)
654 return 1;
655 return strcmp(s1, s2);
656}
657
658static int compare_mount_options(struct ceph_mount_options *new_fsopt,
659 struct ceph_options *new_opt,
660 struct ceph_fs_client *fsc)
661{
662 struct ceph_mount_options *fsopt1 = new_fsopt;
663 struct ceph_mount_options *fsopt2 = fsc->mount_options;
664 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
665 int ret;
666
667 ret = memcmp(fsopt1, fsopt2, ofs);
668 if (ret)
669 return ret;
670
671 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
672 if (ret)
673 return ret;
674
675 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
676 if (ret)
677 return ret;
678
679 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
680 if (ret)
681 return ret;
682
683 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
684 if (ret)
685 return ret;
686
687 ret = strcmp_null(fsopt1->mon_addr, fsopt2->mon_addr);
688 if (ret)
689 return ret;
690
691 return ceph_compare_options(new_opt, fsc->client);
692}
693
694/**
695 * ceph_show_options - Show mount options in /proc/mounts
696 * @m: seq_file to write to
697 * @root: root of that (sub)tree
698 */
699static int ceph_show_options(struct seq_file *m, struct dentry *root)
700{
701 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(root->d_sb);
702 struct ceph_mount_options *fsopt = fsc->mount_options;
703 size_t pos;
704 int ret;
705
706 /* a comma between MNT/MS and client options */
707 seq_putc(m, ',');
708 pos = m->count;
709
710 ret = ceph_print_client_options(m, fsc->client, false);
711 if (ret)
712 return ret;
713
714 /* retract our comma if no client options */
715 if (m->count == pos)
716 m->count--;
717
718 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
719 seq_puts(m, ",dirstat");
720 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
721 seq_puts(m, ",rbytes");
722 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
723 seq_puts(m, ",noasyncreaddir");
724 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
725 seq_puts(m, ",nodcache");
726 if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
727 seq_puts(m, ",ino32");
728 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
729 seq_show_option(m, "fsc", fsopt->fscache_uniq);
730 }
731 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
732 seq_puts(m, ",nopoolperm");
733 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
734 seq_puts(m, ",noquotadf");
735
736#ifdef CONFIG_CEPH_FS_POSIX_ACL
737 if (root->d_sb->s_flags & SB_POSIXACL)
738 seq_puts(m, ",acl");
739 else
740 seq_puts(m, ",noacl");
741#endif
742
743 if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
744 seq_puts(m, ",copyfrom");
745
746 /* dump mds_namespace when old device syntax is in use */
747 if (fsopt->mds_namespace && !fsopt->new_dev_syntax)
748 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
749
750 if (fsopt->mon_addr)
751 seq_printf(m, ",mon_addr=%s", fsopt->mon_addr);
752
753 if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
754 seq_show_option(m, "recover_session", "clean");
755
756 if (!(fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS))
757 seq_puts(m, ",wsync");
758 if (fsopt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
759 seq_puts(m, ",nopagecache");
760 if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
761 seq_puts(m, ",sparseread");
762
763 fscrypt_show_test_dummy_encryption(m, ',', root->d_sb);
764
765 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
766 seq_printf(m, ",wsize=%u", fsopt->wsize);
767 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
768 seq_printf(m, ",rsize=%u", fsopt->rsize);
769 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
770 seq_printf(m, ",rasize=%u", fsopt->rasize);
771 if (fsopt->congestion_kb != default_congestion_kb())
772 seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
773 if (fsopt->caps_max)
774 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
775 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
776 seq_printf(m, ",caps_wanted_delay_min=%u",
777 fsopt->caps_wanted_delay_min);
778 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
779 seq_printf(m, ",caps_wanted_delay_max=%u",
780 fsopt->caps_wanted_delay_max);
781 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
782 seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
783 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
784 seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
785 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
786 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
787
788 return 0;
789}
790
791/*
792 * handle any mon messages the standard library doesn't understand.
793 * return error if we don't either.
794 */
795static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
796{
797 struct ceph_fs_client *fsc = client->private;
798 int type = le16_to_cpu(msg->hdr.type);
799
800 switch (type) {
801 case CEPH_MSG_MDS_MAP:
802 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
803 return 0;
804 case CEPH_MSG_FS_MAP_USER:
805 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
806 return 0;
807 default:
808 return -1;
809 }
810}
811
812/*
813 * create a new fs client
814 *
815 * Success or not, this function consumes @fsopt and @opt.
816 */
817static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
818 struct ceph_options *opt)
819{
820 struct ceph_fs_client *fsc;
821 int err;
822
823 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
824 if (!fsc) {
825 err = -ENOMEM;
826 goto fail;
827 }
828
829 fsc->client = ceph_create_client(opt, fsc);
830 if (IS_ERR(fsc->client)) {
831 err = PTR_ERR(fsc->client);
832 goto fail;
833 }
834 opt = NULL; /* fsc->client now owns this */
835
836 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
837 ceph_set_opt(fsc->client, ABORT_ON_FULL);
838
839 if (!fsopt->mds_namespace) {
840 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
841 0, true);
842 } else {
843 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
844 0, false);
845 }
846
847 fsc->mount_options = fsopt;
848
849 fsc->sb = NULL;
850 fsc->mount_state = CEPH_MOUNT_MOUNTING;
851 fsc->filp_gen = 1;
852 fsc->have_copy_from2 = true;
853
854 atomic_long_set(&fsc->writeback_count, 0);
855 fsc->write_congested = false;
856
857 err = -ENOMEM;
858 /*
859 * The number of concurrent works can be high but they don't need
860 * to be processed in parallel, limit concurrency.
861 */
862 fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
863 if (!fsc->inode_wq)
864 goto fail_client;
865 fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
866 if (!fsc->cap_wq)
867 goto fail_inode_wq;
868
869 hash_init(fsc->async_unlink_conflict);
870 spin_lock_init(&fsc->async_unlink_conflict_lock);
871
872 spin_lock(&ceph_fsc_lock);
873 list_add_tail(&fsc->metric_wakeup, &ceph_fsc_list);
874 spin_unlock(&ceph_fsc_lock);
875
876 return fsc;
877
878fail_inode_wq:
879 destroy_workqueue(fsc->inode_wq);
880fail_client:
881 ceph_destroy_client(fsc->client);
882fail:
883 kfree(fsc);
884 if (opt)
885 ceph_destroy_options(opt);
886 destroy_mount_options(fsopt);
887 return ERR_PTR(err);
888}
889
890static void flush_fs_workqueues(struct ceph_fs_client *fsc)
891{
892 flush_workqueue(fsc->inode_wq);
893 flush_workqueue(fsc->cap_wq);
894}
895
896static void destroy_fs_client(struct ceph_fs_client *fsc)
897{
898 doutc(fsc->client, "%p\n", fsc);
899
900 spin_lock(&ceph_fsc_lock);
901 list_del(&fsc->metric_wakeup);
902 spin_unlock(&ceph_fsc_lock);
903
904 ceph_mdsc_destroy(fsc);
905 destroy_workqueue(fsc->inode_wq);
906 destroy_workqueue(fsc->cap_wq);
907
908 destroy_mount_options(fsc->mount_options);
909
910 ceph_destroy_client(fsc->client);
911
912 kfree(fsc);
913 dout("%s: %p done\n", __func__, fsc);
914}
915
916/*
917 * caches
918 */
919struct kmem_cache *ceph_inode_cachep;
920struct kmem_cache *ceph_cap_cachep;
921struct kmem_cache *ceph_cap_snap_cachep;
922struct kmem_cache *ceph_cap_flush_cachep;
923struct kmem_cache *ceph_dentry_cachep;
924struct kmem_cache *ceph_file_cachep;
925struct kmem_cache *ceph_dir_file_cachep;
926struct kmem_cache *ceph_mds_request_cachep;
927mempool_t *ceph_wb_pagevec_pool;
928
929static void ceph_inode_init_once(void *foo)
930{
931 struct ceph_inode_info *ci = foo;
932 inode_init_once(&ci->netfs.inode);
933}
934
935static int __init init_caches(void)
936{
937 int error = -ENOMEM;
938
939 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
940 sizeof(struct ceph_inode_info),
941 __alignof__(struct ceph_inode_info),
942 SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
943 ceph_inode_init_once);
944 if (!ceph_inode_cachep)
945 return -ENOMEM;
946
947 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 0);
948 if (!ceph_cap_cachep)
949 goto bad_cap;
950 ceph_cap_snap_cachep = KMEM_CACHE(ceph_cap_snap, 0);
951 if (!ceph_cap_snap_cachep)
952 goto bad_cap_snap;
953 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
954 SLAB_RECLAIM_ACCOUNT);
955 if (!ceph_cap_flush_cachep)
956 goto bad_cap_flush;
957
958 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
959 SLAB_RECLAIM_ACCOUNT);
960 if (!ceph_dentry_cachep)
961 goto bad_dentry;
962
963 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 0);
964 if (!ceph_file_cachep)
965 goto bad_file;
966
967 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, 0);
968 if (!ceph_dir_file_cachep)
969 goto bad_dir_file;
970
971 ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, 0);
972 if (!ceph_mds_request_cachep)
973 goto bad_mds_req;
974
975 ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(10,
976 (CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT) * sizeof(struct page *));
977 if (!ceph_wb_pagevec_pool)
978 goto bad_pagevec_pool;
979
980 return 0;
981
982bad_pagevec_pool:
983 kmem_cache_destroy(ceph_mds_request_cachep);
984bad_mds_req:
985 kmem_cache_destroy(ceph_dir_file_cachep);
986bad_dir_file:
987 kmem_cache_destroy(ceph_file_cachep);
988bad_file:
989 kmem_cache_destroy(ceph_dentry_cachep);
990bad_dentry:
991 kmem_cache_destroy(ceph_cap_flush_cachep);
992bad_cap_flush:
993 kmem_cache_destroy(ceph_cap_snap_cachep);
994bad_cap_snap:
995 kmem_cache_destroy(ceph_cap_cachep);
996bad_cap:
997 kmem_cache_destroy(ceph_inode_cachep);
998 return error;
999}
1000
1001static void destroy_caches(void)
1002{
1003 /*
1004 * Make sure all delayed rcu free inodes are flushed before we
1005 * destroy cache.
1006 */
1007 rcu_barrier();
1008
1009 kmem_cache_destroy(ceph_inode_cachep);
1010 kmem_cache_destroy(ceph_cap_cachep);
1011 kmem_cache_destroy(ceph_cap_snap_cachep);
1012 kmem_cache_destroy(ceph_cap_flush_cachep);
1013 kmem_cache_destroy(ceph_dentry_cachep);
1014 kmem_cache_destroy(ceph_file_cachep);
1015 kmem_cache_destroy(ceph_dir_file_cachep);
1016 kmem_cache_destroy(ceph_mds_request_cachep);
1017 mempool_destroy(ceph_wb_pagevec_pool);
1018}
1019
1020static void __ceph_umount_begin(struct ceph_fs_client *fsc)
1021{
1022 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
1023 ceph_mdsc_force_umount(fsc->mdsc);
1024 fsc->filp_gen++; // invalidate open files
1025}
1026
1027/*
1028 * ceph_umount_begin - initiate forced umount. Tear down the
1029 * mount, skipping steps that may hang while waiting for server(s).
1030 */
1031void ceph_umount_begin(struct super_block *sb)
1032{
1033 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1034
1035 doutc(fsc->client, "starting forced umount\n");
1036 if (!fsc)
1037 return;
1038 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
1039 __ceph_umount_begin(fsc);
1040}
1041
1042static const struct super_operations ceph_super_ops = {
1043 .alloc_inode = ceph_alloc_inode,
1044 .free_inode = ceph_free_inode,
1045 .write_inode = ceph_write_inode,
1046 .drop_inode = generic_delete_inode,
1047 .evict_inode = ceph_evict_inode,
1048 .sync_fs = ceph_sync_fs,
1049 .put_super = ceph_put_super,
1050 .show_options = ceph_show_options,
1051 .statfs = ceph_statfs,
1052 .umount_begin = ceph_umount_begin,
1053};
1054
1055/*
1056 * Bootstrap mount by opening the root directory. Note the mount
1057 * @started time from caller, and time out if this takes too long.
1058 */
1059static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
1060 const char *path,
1061 unsigned long started)
1062{
1063 struct ceph_client *cl = fsc->client;
1064 struct ceph_mds_client *mdsc = fsc->mdsc;
1065 struct ceph_mds_request *req = NULL;
1066 int err;
1067 struct dentry *root;
1068
1069 /* open dir */
1070 doutc(cl, "opening '%s'\n", path);
1071 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1072 if (IS_ERR(req))
1073 return ERR_CAST(req);
1074 req->r_path1 = kstrdup(path, GFP_NOFS);
1075 if (!req->r_path1) {
1076 root = ERR_PTR(-ENOMEM);
1077 goto out;
1078 }
1079
1080 req->r_ino1.ino = CEPH_INO_ROOT;
1081 req->r_ino1.snap = CEPH_NOSNAP;
1082 req->r_started = started;
1083 req->r_timeout = fsc->client->options->mount_timeout;
1084 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
1085 req->r_num_caps = 2;
1086 err = ceph_mdsc_do_request(mdsc, NULL, req);
1087 if (err == 0) {
1088 struct inode *inode = req->r_target_inode;
1089 req->r_target_inode = NULL;
1090 doutc(cl, "success\n");
1091 root = d_make_root(inode);
1092 if (!root) {
1093 root = ERR_PTR(-ENOMEM);
1094 goto out;
1095 }
1096 doutc(cl, "success, root dentry is %p\n", root);
1097 } else {
1098 root = ERR_PTR(err);
1099 }
1100out:
1101 ceph_mdsc_put_request(req);
1102 return root;
1103}
1104
1105#ifdef CONFIG_FS_ENCRYPTION
1106static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1107 struct fs_context *fc,
1108 struct ceph_mount_options *fsopt)
1109{
1110 struct ceph_fs_client *fsc = sb->s_fs_info;
1111
1112 if (!fscrypt_is_dummy_policy_set(&fsopt->dummy_enc_policy))
1113 return 0;
1114
1115 /* No changing encryption context on remount. */
1116 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE &&
1117 !fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
1118 if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
1119 &fsc->fsc_dummy_enc_policy))
1120 return 0;
1121 errorfc(fc, "Can't set test_dummy_encryption on remount");
1122 return -EINVAL;
1123 }
1124
1125 /* Also make sure fsopt doesn't contain a conflicting value. */
1126 if (fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
1127 if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
1128 &fsc->fsc_dummy_enc_policy))
1129 return 0;
1130 errorfc(fc, "Conflicting test_dummy_encryption options");
1131 return -EINVAL;
1132 }
1133
1134 fsc->fsc_dummy_enc_policy = fsopt->dummy_enc_policy;
1135 memset(&fsopt->dummy_enc_policy, 0, sizeof(fsopt->dummy_enc_policy));
1136
1137 warnfc(fc, "test_dummy_encryption mode enabled");
1138 return 0;
1139}
1140#else
1141static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1142 struct fs_context *fc,
1143 struct ceph_mount_options *fsopt)
1144{
1145 return 0;
1146}
1147#endif
1148
1149/*
1150 * mount: join the ceph cluster, and open root directory.
1151 */
1152static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
1153 struct fs_context *fc)
1154{
1155 struct ceph_client *cl = fsc->client;
1156 int err;
1157 unsigned long started = jiffies; /* note the start time */
1158 struct dentry *root;
1159
1160 doutc(cl, "mount start %p\n", fsc);
1161 mutex_lock(&fsc->client->mount_mutex);
1162
1163 if (!fsc->sb->s_root) {
1164 const char *path = fsc->mount_options->server_path ?
1165 fsc->mount_options->server_path + 1 : "";
1166
1167 err = __ceph_open_session(fsc->client, started);
1168 if (err < 0)
1169 goto out;
1170
1171 /* setup fscache */
1172 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
1173 err = ceph_fscache_register_fs(fsc, fc);
1174 if (err < 0)
1175 goto out;
1176 }
1177
1178 err = ceph_apply_test_dummy_encryption(fsc->sb, fc,
1179 fsc->mount_options);
1180 if (err)
1181 goto out;
1182
1183 doutc(cl, "mount opening path '%s'\n", path);
1184
1185 ceph_fs_debugfs_init(fsc);
1186
1187 root = open_root_dentry(fsc, path, started);
1188 if (IS_ERR(root)) {
1189 err = PTR_ERR(root);
1190 goto out;
1191 }
1192 fsc->sb->s_root = dget(root);
1193 } else {
1194 root = dget(fsc->sb->s_root);
1195 }
1196
1197 fsc->mount_state = CEPH_MOUNT_MOUNTED;
1198 doutc(cl, "mount success\n");
1199 mutex_unlock(&fsc->client->mount_mutex);
1200 return root;
1201
1202out:
1203 mutex_unlock(&fsc->client->mount_mutex);
1204 ceph_fscrypt_free_dummy_policy(fsc);
1205 return ERR_PTR(err);
1206}
1207
1208static int ceph_set_super(struct super_block *s, struct fs_context *fc)
1209{
1210 struct ceph_fs_client *fsc = s->s_fs_info;
1211 struct ceph_client *cl = fsc->client;
1212 int ret;
1213
1214 doutc(cl, "%p\n", s);
1215
1216 s->s_maxbytes = MAX_LFS_FILESIZE;
1217
1218 s->s_xattr = ceph_xattr_handlers;
1219 fsc->sb = s;
1220 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
1221
1222 s->s_op = &ceph_super_ops;
1223 s->s_d_op = &ceph_dentry_ops;
1224 s->s_export_op = &ceph_export_ops;
1225
1226 s->s_time_gran = 1;
1227 s->s_time_min = 0;
1228 s->s_time_max = U32_MAX;
1229 s->s_flags |= SB_NODIRATIME | SB_NOATIME;
1230
1231 ceph_fscrypt_set_ops(s);
1232
1233 ret = set_anon_super_fc(s, fc);
1234 if (ret != 0)
1235 fsc->sb = NULL;
1236 return ret;
1237}
1238
1239/*
1240 * share superblock if same fs AND options
1241 */
1242static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
1243{
1244 struct ceph_fs_client *new = fc->s_fs_info;
1245 struct ceph_mount_options *fsopt = new->mount_options;
1246 struct ceph_options *opt = new->client->options;
1247 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1248 struct ceph_client *cl = fsc->client;
1249
1250 doutc(cl, "%p\n", sb);
1251
1252 if (compare_mount_options(fsopt, opt, fsc)) {
1253 doutc(cl, "monitor(s)/mount options don't match\n");
1254 return 0;
1255 }
1256 if ((opt->flags & CEPH_OPT_FSID) &&
1257 ceph_fsid_compare(&opt->fsid, &fsc->client->fsid)) {
1258 doutc(cl, "fsid doesn't match\n");
1259 return 0;
1260 }
1261 if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
1262 doutc(cl, "flags differ\n");
1263 return 0;
1264 }
1265
1266 if (fsc->blocklisted && !ceph_test_mount_opt(fsc, CLEANRECOVER)) {
1267 doutc(cl, "client is blocklisted (and CLEANRECOVER is not set)\n");
1268 return 0;
1269 }
1270
1271 if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) {
1272 doutc(cl, "client has been forcibly unmounted\n");
1273 return 0;
1274 }
1275
1276 return 1;
1277}
1278
1279/*
1280 * construct our own bdi so we can control readahead, etc.
1281 */
1282static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1283
1284static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1285{
1286 int err;
1287
1288 err = super_setup_bdi_name(sb, "ceph-%ld",
1289 atomic_long_inc_return(&bdi_seq));
1290 if (err)
1291 return err;
1292
1293 /* set ra_pages based on rasize mount option? */
1294 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1295
1296 /* set io_pages based on max osd read size */
1297 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1298
1299 return 0;
1300}
1301
1302static int ceph_get_tree(struct fs_context *fc)
1303{
1304 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1305 struct ceph_mount_options *fsopt = pctx->opts;
1306 struct super_block *sb;
1307 struct ceph_fs_client *fsc;
1308 struct dentry *res;
1309 int (*compare_super)(struct super_block *, struct fs_context *) =
1310 ceph_compare_super;
1311 int err;
1312
1313 dout("ceph_get_tree\n");
1314
1315 if (!fc->source)
1316 return invalfc(fc, "No source");
1317 if (fsopt->new_dev_syntax && !fsopt->mon_addr)
1318 return invalfc(fc, "No monitor address");
1319
1320 /* create client (which we may/may not use) */
1321 fsc = create_fs_client(pctx->opts, pctx->copts);
1322 pctx->opts = NULL;
1323 pctx->copts = NULL;
1324 if (IS_ERR(fsc)) {
1325 err = PTR_ERR(fsc);
1326 goto out_final;
1327 }
1328
1329 err = ceph_mdsc_init(fsc);
1330 if (err < 0)
1331 goto out;
1332
1333 if (ceph_test_opt(fsc->client, NOSHARE))
1334 compare_super = NULL;
1335
1336 fc->s_fs_info = fsc;
1337 sb = sget_fc(fc, compare_super, ceph_set_super);
1338 fc->s_fs_info = NULL;
1339 if (IS_ERR(sb)) {
1340 err = PTR_ERR(sb);
1341 goto out;
1342 }
1343
1344 if (ceph_sb_to_fs_client(sb) != fsc) {
1345 destroy_fs_client(fsc);
1346 fsc = ceph_sb_to_fs_client(sb);
1347 dout("get_sb got existing client %p\n", fsc);
1348 } else {
1349 dout("get_sb using new client %p\n", fsc);
1350 err = ceph_setup_bdi(sb, fsc);
1351 if (err < 0)
1352 goto out_splat;
1353 }
1354
1355 res = ceph_real_mount(fsc, fc);
1356 if (IS_ERR(res)) {
1357 err = PTR_ERR(res);
1358 goto out_splat;
1359 }
1360
1361 doutc(fsc->client, "root %p inode %p ino %llx.%llx\n", res,
1362 d_inode(res), ceph_vinop(d_inode(res)));
1363 fc->root = fsc->sb->s_root;
1364 return 0;
1365
1366out_splat:
1367 if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
1368 pr_info("No mds server is up or the cluster is laggy\n");
1369 err = -EHOSTUNREACH;
1370 }
1371
1372 ceph_mdsc_close_sessions(fsc->mdsc);
1373 deactivate_locked_super(sb);
1374 goto out_final;
1375
1376out:
1377 destroy_fs_client(fsc);
1378out_final:
1379 dout("ceph_get_tree fail %d\n", err);
1380 return err;
1381}
1382
1383static void ceph_free_fc(struct fs_context *fc)
1384{
1385 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1386
1387 if (pctx) {
1388 destroy_mount_options(pctx->opts);
1389 ceph_destroy_options(pctx->copts);
1390 kfree(pctx);
1391 }
1392}
1393
1394static int ceph_reconfigure_fc(struct fs_context *fc)
1395{
1396 int err;
1397 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1398 struct ceph_mount_options *fsopt = pctx->opts;
1399 struct super_block *sb = fc->root->d_sb;
1400 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1401
1402 err = ceph_apply_test_dummy_encryption(sb, fc, fsopt);
1403 if (err)
1404 return err;
1405
1406 if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1407 ceph_set_mount_opt(fsc, ASYNC_DIROPS);
1408 else
1409 ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
1410
1411 if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
1412 ceph_set_mount_opt(fsc, SPARSEREAD);
1413 else
1414 ceph_clear_mount_opt(fsc, SPARSEREAD);
1415
1416 if (strcmp_null(fsc->mount_options->mon_addr, fsopt->mon_addr)) {
1417 kfree(fsc->mount_options->mon_addr);
1418 fsc->mount_options->mon_addr = fsopt->mon_addr;
1419 fsopt->mon_addr = NULL;
1420 pr_notice_client(fsc->client,
1421 "monitor addresses recorded, but not used for reconnection");
1422 }
1423
1424 sync_filesystem(sb);
1425 return 0;
1426}
1427
1428static const struct fs_context_operations ceph_context_ops = {
1429 .free = ceph_free_fc,
1430 .parse_param = ceph_parse_mount_param,
1431 .get_tree = ceph_get_tree,
1432 .reconfigure = ceph_reconfigure_fc,
1433};
1434
1435/*
1436 * Set up the filesystem mount context.
1437 */
1438static int ceph_init_fs_context(struct fs_context *fc)
1439{
1440 struct ceph_parse_opts_ctx *pctx;
1441 struct ceph_mount_options *fsopt;
1442
1443 pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1444 if (!pctx)
1445 return -ENOMEM;
1446
1447 pctx->copts = ceph_alloc_options();
1448 if (!pctx->copts)
1449 goto nomem;
1450
1451 pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1452 if (!pctx->opts)
1453 goto nomem;
1454
1455 fsopt = pctx->opts;
1456 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1457
1458 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1459 fsopt->rsize = CEPH_MAX_READ_SIZE;
1460 fsopt->rasize = CEPH_RASIZE_DEFAULT;
1461 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1462 if (!fsopt->snapdir_name)
1463 goto nomem;
1464
1465 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1466 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1467 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1468 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1469 fsopt->congestion_kb = default_congestion_kb();
1470
1471#ifdef CONFIG_CEPH_FS_POSIX_ACL
1472 fc->sb_flags |= SB_POSIXACL;
1473#endif
1474
1475 fc->fs_private = pctx;
1476 fc->ops = &ceph_context_ops;
1477 return 0;
1478
1479nomem:
1480 destroy_mount_options(pctx->opts);
1481 ceph_destroy_options(pctx->copts);
1482 kfree(pctx);
1483 return -ENOMEM;
1484}
1485
1486/*
1487 * Return true if it successfully increases the blocker counter,
1488 * or false if the mdsc is in stopping and flushed state.
1489 */
1490static bool __inc_stopping_blocker(struct ceph_mds_client *mdsc)
1491{
1492 spin_lock(&mdsc->stopping_lock);
1493 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING) {
1494 spin_unlock(&mdsc->stopping_lock);
1495 return false;
1496 }
1497 atomic_inc(&mdsc->stopping_blockers);
1498 spin_unlock(&mdsc->stopping_lock);
1499 return true;
1500}
1501
1502static void __dec_stopping_blocker(struct ceph_mds_client *mdsc)
1503{
1504 spin_lock(&mdsc->stopping_lock);
1505 if (!atomic_dec_return(&mdsc->stopping_blockers) &&
1506 mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING)
1507 complete_all(&mdsc->stopping_waiter);
1508 spin_unlock(&mdsc->stopping_lock);
1509}
1510
1511/* For metadata IO requests */
1512bool ceph_inc_mds_stopping_blocker(struct ceph_mds_client *mdsc,
1513 struct ceph_mds_session *session)
1514{
1515 mutex_lock(&session->s_mutex);
1516 inc_session_sequence(session);
1517 mutex_unlock(&session->s_mutex);
1518
1519 return __inc_stopping_blocker(mdsc);
1520}
1521
1522void ceph_dec_mds_stopping_blocker(struct ceph_mds_client *mdsc)
1523{
1524 __dec_stopping_blocker(mdsc);
1525}
1526
1527/* For data IO requests */
1528bool ceph_inc_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1529{
1530 return __inc_stopping_blocker(mdsc);
1531}
1532
1533void ceph_dec_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1534{
1535 __dec_stopping_blocker(mdsc);
1536}
1537
1538static void ceph_kill_sb(struct super_block *s)
1539{
1540 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(s);
1541 struct ceph_client *cl = fsc->client;
1542 struct ceph_mds_client *mdsc = fsc->mdsc;
1543 bool wait;
1544
1545 doutc(cl, "%p\n", s);
1546
1547 ceph_mdsc_pre_umount(mdsc);
1548 flush_fs_workqueues(fsc);
1549
1550 /*
1551 * Though the kill_anon_super() will finally trigger the
1552 * sync_filesystem() anyway, we still need to do it here and
1553 * then bump the stage of shutdown. This will allow us to
1554 * drop any further message, which will increase the inodes'
1555 * i_count reference counters but makes no sense any more,
1556 * from MDSs.
1557 *
1558 * Without this when evicting the inodes it may fail in the
1559 * kill_anon_super(), which will trigger a warning when
1560 * destroying the fscrypt keyring and then possibly trigger
1561 * a further crash in ceph module when the iput() tries to
1562 * evict the inodes later.
1563 */
1564 sync_filesystem(s);
1565
1566 spin_lock(&mdsc->stopping_lock);
1567 mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHING;
1568 wait = !!atomic_read(&mdsc->stopping_blockers);
1569 spin_unlock(&mdsc->stopping_lock);
1570
1571 if (wait && atomic_read(&mdsc->stopping_blockers)) {
1572 long timeleft = wait_for_completion_killable_timeout(
1573 &mdsc->stopping_waiter,
1574 fsc->client->options->mount_timeout);
1575 if (!timeleft) /* timed out */
1576 pr_warn_client(cl, "umount timed out, %ld\n", timeleft);
1577 else if (timeleft < 0) /* killed */
1578 pr_warn_client(cl, "umount was killed, %ld\n", timeleft);
1579 }
1580
1581 mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHED;
1582 kill_anon_super(s);
1583
1584 fsc->client->extra_mon_dispatch = NULL;
1585 ceph_fs_debugfs_cleanup(fsc);
1586
1587 ceph_fscache_unregister_fs(fsc);
1588
1589 destroy_fs_client(fsc);
1590}
1591
1592static struct file_system_type ceph_fs_type = {
1593 .owner = THIS_MODULE,
1594 .name = "ceph",
1595 .init_fs_context = ceph_init_fs_context,
1596 .kill_sb = ceph_kill_sb,
1597 .fs_flags = FS_RENAME_DOES_D_MOVE | FS_ALLOW_IDMAP,
1598};
1599MODULE_ALIAS_FS("ceph");
1600
1601int ceph_force_reconnect(struct super_block *sb)
1602{
1603 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1604 int err = 0;
1605
1606 fsc->mount_state = CEPH_MOUNT_RECOVER;
1607 __ceph_umount_begin(fsc);
1608
1609 /* Make sure all page caches get invalidated.
1610 * see remove_session_caps_cb() */
1611 flush_workqueue(fsc->inode_wq);
1612
1613 /* In case that we were blocklisted. This also reset
1614 * all mon/osd connections */
1615 ceph_reset_client_addr(fsc->client);
1616
1617 ceph_osdc_clear_abort_err(&fsc->client->osdc);
1618
1619 fsc->blocklisted = false;
1620 fsc->mount_state = CEPH_MOUNT_MOUNTED;
1621
1622 if (sb->s_root) {
1623 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1624 CEPH_STAT_CAP_INODE, true);
1625 }
1626 return err;
1627}
1628
1629static int __init init_ceph(void)
1630{
1631 int ret = init_caches();
1632 if (ret)
1633 goto out;
1634
1635 ceph_flock_init();
1636 ret = register_filesystem(&ceph_fs_type);
1637 if (ret)
1638 goto out_caches;
1639
1640 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1641
1642 return 0;
1643
1644out_caches:
1645 destroy_caches();
1646out:
1647 return ret;
1648}
1649
1650static void __exit exit_ceph(void)
1651{
1652 dout("exit_ceph\n");
1653 unregister_filesystem(&ceph_fs_type);
1654 destroy_caches();
1655}
1656
1657static int param_set_metrics(const char *val, const struct kernel_param *kp)
1658{
1659 struct ceph_fs_client *fsc;
1660 int ret;
1661
1662 ret = param_set_bool(val, kp);
1663 if (ret) {
1664 pr_err("Failed to parse sending metrics switch value '%s'\n",
1665 val);
1666 return ret;
1667 } else if (!disable_send_metrics) {
1668 // wake up all the mds clients
1669 spin_lock(&ceph_fsc_lock);
1670 list_for_each_entry(fsc, &ceph_fsc_list, metric_wakeup) {
1671 metric_schedule_delayed(&fsc->mdsc->metric);
1672 }
1673 spin_unlock(&ceph_fsc_lock);
1674 }
1675
1676 return 0;
1677}
1678
1679static const struct kernel_param_ops param_ops_metrics = {
1680 .set = param_set_metrics,
1681 .get = param_get_bool,
1682};
1683
1684bool disable_send_metrics = false;
1685module_param_cb(disable_send_metrics, ¶m_ops_metrics, &disable_send_metrics, 0644);
1686MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
1687
1688/* for both v1 and v2 syntax */
1689static bool mount_support = true;
1690static const struct kernel_param_ops param_ops_mount_syntax = {
1691 .get = param_get_bool,
1692};
1693module_param_cb(mount_syntax_v1, ¶m_ops_mount_syntax, &mount_support, 0444);
1694module_param_cb(mount_syntax_v2, ¶m_ops_mount_syntax, &mount_support, 0444);
1695
1696bool enable_unsafe_idmap = false;
1697module_param(enable_unsafe_idmap, bool, 0644);
1698MODULE_PARM_DESC(enable_unsafe_idmap,
1699 "Allow to use idmapped mounts with MDS without CEPHFS_FEATURE_HAS_OWNER_UIDGID");
1700
1701module_init(init_ceph);
1702module_exit(exit_ceph);
1703
1704MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1705MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1706MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1707MODULE_DESCRIPTION("Ceph filesystem for Linux");
1708MODULE_LICENSE("GPL");