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