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ceph: fix mds cluster availability check
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CommitLineData
16725b9d 1
3d14c5d2 2#include <linux/ceph/ceph_debug.h>
16725b9d
SW
3
4#include <linux/backing-dev.h>
c309f0ab 5#include <linux/ctype.h>
16725b9d
SW
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>
16725b9d
SW
12#include <linux/sched.h>
13#include <linux/seq_file.h>
5a0e3ad6 14#include <linux/slab.h>
16725b9d
SW
15#include <linux/statfs.h>
16#include <linux/string.h>
16725b9d 17
16725b9d 18#include "super.h"
3d14c5d2 19#include "mds_client.h"
99ccbd22 20#include "cache.h"
3d14c5d2 21
1fe60e51 22#include <linux/ceph/ceph_features.h>
3d14c5d2
YS
23#include <linux/ceph/decode.h>
24#include <linux/ceph/mon_client.h>
25#include <linux/ceph/auth.h>
26#include <linux/ceph/debugfs.h>
16725b9d
SW
27
28/*
29 * Ceph superblock operations
30 *
31 * Handle the basics of mounting, unmounting.
32 */
33
16725b9d
SW
34/*
35 * super ops
36 */
37static void ceph_put_super(struct super_block *s)
38{
3d14c5d2 39 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
16725b9d
SW
40
41 dout("put_super\n");
3d14c5d2 42 ceph_mdsc_close_sessions(fsc->mdsc);
16725b9d
SW
43}
44
45static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
46{
2b0143b5 47 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
3d14c5d2 48 struct ceph_monmap *monmap = fsc->client->monc.monmap;
16725b9d
SW
49 struct ceph_statfs st;
50 u64 fsid;
51 int err;
52
53 dout("statfs\n");
3d14c5d2 54 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
16725b9d
SW
55 if (err < 0)
56 return err;
57
58 /* fill in kstatfs */
59 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
60
61 /*
62 * express utilization in terms of large blocks to avoid
63 * overflow on 32-bit machines.
92a49fb0
SW
64 *
65 * NOTE: for the time being, we make bsize == frsize to humor
66 * not-yet-ancient versions of glibc that are broken.
67 * Someday, we will probably want to report a real block
68 * size... whatever that may mean for a network file system!
16725b9d
SW
69 */
70 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
92a49fb0 71 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
16725b9d 72 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
8f04d422 73 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
16725b9d
SW
74 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
75
76 buf->f_files = le64_to_cpu(st.num_objects);
77 buf->f_ffree = -1;
558d3499 78 buf->f_namelen = NAME_MAX;
16725b9d
SW
79
80 /* leave fsid little-endian, regardless of host endianness */
81 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
82 buf->f_fsid.val[0] = fsid & 0xffffffff;
83 buf->f_fsid.val[1] = fsid >> 32;
84
85 return 0;
86}
87
88
2d9c98ae 89static int ceph_sync_fs(struct super_block *sb, int wait)
16725b9d 90{
3d14c5d2 91 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
2d9c98ae
SW
92
93 if (!wait) {
94 dout("sync_fs (non-blocking)\n");
3d14c5d2 95 ceph_flush_dirty_caps(fsc->mdsc);
2d9c98ae
SW
96 dout("sync_fs (non-blocking) done\n");
97 return 0;
98 }
99
100 dout("sync_fs (blocking)\n");
3d14c5d2
YS
101 ceph_osdc_sync(&fsc->client->osdc);
102 ceph_mdsc_sync(fsc->mdsc);
2d9c98ae 103 dout("sync_fs (blocking) done\n");
16725b9d
SW
104 return 0;
105}
106
16725b9d
SW
107/*
108 * mount options
109 */
110enum {
16725b9d
SW
111 Opt_wsize,
112 Opt_rsize,
83817e35 113 Opt_rasize,
16725b9d
SW
114 Opt_caps_wanted_delay_min,
115 Opt_caps_wanted_delay_max,
6e19a16e 116 Opt_cap_release_safety,
16725b9d 117 Opt_readdir_max_entries,
23804d91 118 Opt_readdir_max_bytes,
2baba250 119 Opt_congestion_kb,
e53c2fe0 120 Opt_last_int,
16725b9d
SW
121 /* int args above */
122 Opt_snapdirname,
430afbad 123 Opt_mds_namespace,
e53c2fe0 124 Opt_last_string,
16725b9d 125 /* string args above */
16725b9d
SW
126 Opt_dirstat,
127 Opt_nodirstat,
128 Opt_rbytes,
129 Opt_norbytes,
cffaba15 130 Opt_asyncreaddir,
16725b9d 131 Opt_noasyncreaddir,
a40dc6cc
SW
132 Opt_dcache,
133 Opt_nodcache,
ad1fee96 134 Opt_ino32,
cffaba15 135 Opt_noino32,
99ccbd22 136 Opt_fscache,
45195e42 137 Opt_nofscache,
10183a69
YZ
138 Opt_poolperm,
139 Opt_nopoolperm,
e9e427f0
YZ
140 Opt_require_active_mds,
141 Opt_norequire_active_mds,
45195e42
SW
142#ifdef CONFIG_CEPH_FS_POSIX_ACL
143 Opt_acl,
144#endif
10183a69 145 Opt_noacl,
16725b9d
SW
146};
147
3d14c5d2 148static match_table_t fsopt_tokens = {
16725b9d
SW
149 {Opt_wsize, "wsize=%d"},
150 {Opt_rsize, "rsize=%d"},
83817e35 151 {Opt_rasize, "rasize=%d"},
16725b9d
SW
152 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
153 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
6e19a16e 154 {Opt_cap_release_safety, "cap_release_safety=%d"},
16725b9d 155 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
23804d91 156 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
2baba250 157 {Opt_congestion_kb, "write_congestion_kb=%d"},
16725b9d
SW
158 /* int args above */
159 {Opt_snapdirname, "snapdirname=%s"},
430afbad 160 {Opt_mds_namespace, "mds_namespace=%s"},
16725b9d 161 /* string args above */
16725b9d
SW
162 {Opt_dirstat, "dirstat"},
163 {Opt_nodirstat, "nodirstat"},
164 {Opt_rbytes, "rbytes"},
165 {Opt_norbytes, "norbytes"},
cffaba15 166 {Opt_asyncreaddir, "asyncreaddir"},
16725b9d 167 {Opt_noasyncreaddir, "noasyncreaddir"},
a40dc6cc
SW
168 {Opt_dcache, "dcache"},
169 {Opt_nodcache, "nodcache"},
ad1fee96 170 {Opt_ino32, "ino32"},
cffaba15 171 {Opt_noino32, "noino32"},
99ccbd22
MT
172 {Opt_fscache, "fsc"},
173 {Opt_nofscache, "nofsc"},
10183a69
YZ
174 {Opt_poolperm, "poolperm"},
175 {Opt_nopoolperm, "nopoolperm"},
e9e427f0
YZ
176 {Opt_require_active_mds, "require_active_mds"},
177 {Opt_norequire_active_mds, "norequire_active_mds"},
45195e42
SW
178#ifdef CONFIG_CEPH_FS_POSIX_ACL
179 {Opt_acl, "acl"},
180#endif
181 {Opt_noacl, "noacl"},
16725b9d
SW
182 {-1, NULL}
183};
184
3d14c5d2 185static int parse_fsopt_token(char *c, void *private)
c309f0ab 186{
3d14c5d2
YS
187 struct ceph_mount_options *fsopt = private;
188 substring_t argstr[MAX_OPT_ARGS];
189 int token, intval, ret;
190
191 token = match_token((char *)c, fsopt_tokens, argstr);
192 if (token < 0)
193 return -EINVAL;
194
195 if (token < Opt_last_int) {
196 ret = match_int(&argstr[0], &intval);
197 if (ret < 0) {
198 pr_err("bad mount option arg (not int) "
199 "at '%s'\n", c);
200 return ret;
c309f0ab 201 }
3d14c5d2
YS
202 dout("got int token %d val %d\n", token, intval);
203 } else if (token > Opt_last_int && token < Opt_last_string) {
204 dout("got string token %d val %s\n", token,
205 argstr[0].from);
206 } else {
207 dout("got token %d\n", token);
c309f0ab
SW
208 }
209
3d14c5d2
YS
210 switch (token) {
211 case Opt_snapdirname:
212 kfree(fsopt->snapdir_name);
213 fsopt->snapdir_name = kstrndup(argstr[0].from,
214 argstr[0].to-argstr[0].from,
215 GFP_KERNEL);
216 if (!fsopt->snapdir_name)
217 return -ENOMEM;
218 break;
235a0982 219 case Opt_mds_namespace:
430afbad
YZ
220 fsopt->mds_namespace = kstrndup(argstr[0].from,
221 argstr[0].to-argstr[0].from,
222 GFP_KERNEL);
223 if (!fsopt->mds_namespace)
224 return -ENOMEM;
235a0982 225 break;
430afbad 226 /* misc */
3d14c5d2
YS
227 case Opt_wsize:
228 fsopt->wsize = intval;
229 break;
230 case Opt_rsize:
231 fsopt->rsize = intval;
232 break;
83817e35
SW
233 case Opt_rasize:
234 fsopt->rasize = intval;
235 break;
3d14c5d2
YS
236 case Opt_caps_wanted_delay_min:
237 fsopt->caps_wanted_delay_min = intval;
238 break;
239 case Opt_caps_wanted_delay_max:
240 fsopt->caps_wanted_delay_max = intval;
241 break;
242 case Opt_readdir_max_entries:
243 fsopt->max_readdir = intval;
244 break;
245 case Opt_readdir_max_bytes:
246 fsopt->max_readdir_bytes = intval;
247 break;
248 case Opt_congestion_kb:
249 fsopt->congestion_kb = intval;
250 break;
251 case Opt_dirstat:
252 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
253 break;
254 case Opt_nodirstat:
255 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
256 break;
257 case Opt_rbytes:
258 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
259 break;
260 case Opt_norbytes:
261 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
262 break;
cffaba15
AE
263 case Opt_asyncreaddir:
264 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
265 break;
3d14c5d2
YS
266 case Opt_noasyncreaddir:
267 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
268 break;
a40dc6cc
SW
269 case Opt_dcache:
270 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
271 break;
272 case Opt_nodcache:
273 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
274 break;
ad1fee96
YS
275 case Opt_ino32:
276 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
277 break;
cffaba15
AE
278 case Opt_noino32:
279 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
280 break;
99ccbd22
MT
281 case Opt_fscache:
282 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
283 break;
284 case Opt_nofscache:
285 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
286 break;
10183a69
YZ
287 case Opt_poolperm:
288 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
289 printk ("pool perm");
290 break;
291 case Opt_nopoolperm:
292 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
293 break;
e9e427f0
YZ
294 case Opt_require_active_mds:
295 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
296 break;
297 case Opt_norequire_active_mds:
298 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
299 break;
45195e42
SW
300#ifdef CONFIG_CEPH_FS_POSIX_ACL
301 case Opt_acl:
302 fsopt->sb_flags |= MS_POSIXACL;
303 break;
304#endif
305 case Opt_noacl:
306 fsopt->sb_flags &= ~MS_POSIXACL;
307 break;
3d14c5d2
YS
308 default:
309 BUG_ON(token);
310 }
311 return 0;
c309f0ab 312}
16725b9d 313
3d14c5d2 314static void destroy_mount_options(struct ceph_mount_options *args)
16725b9d 315{
3d14c5d2
YS
316 dout("destroy_mount_options %p\n", args);
317 kfree(args->snapdir_name);
430afbad 318 kfree(args->mds_namespace);
3f384954 319 kfree(args->server_path);
3d14c5d2
YS
320 kfree(args);
321}
16725b9d 322
3d14c5d2
YS
323static int strcmp_null(const char *s1, const char *s2)
324{
325 if (!s1 && !s2)
326 return 0;
327 if (s1 && !s2)
328 return -1;
329 if (!s1 && s2)
330 return 1;
331 return strcmp(s1, s2);
332}
16725b9d 333
3d14c5d2
YS
334static int compare_mount_options(struct ceph_mount_options *new_fsopt,
335 struct ceph_options *new_opt,
336 struct ceph_fs_client *fsc)
337{
338 struct ceph_mount_options *fsopt1 = new_fsopt;
339 struct ceph_mount_options *fsopt2 = fsc->mount_options;
340 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
341 int ret;
16725b9d 342
3d14c5d2
YS
343 ret = memcmp(fsopt1, fsopt2, ofs);
344 if (ret)
345 return ret;
346
347 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
430afbad
YZ
348 if (ret)
349 return ret;
350 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
3d14c5d2
YS
351 if (ret)
352 return ret;
353
3f384954
YZ
354 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
355 if (ret)
356 return ret;
357
3d14c5d2
YS
358 return ceph_compare_options(new_opt, fsc->client);
359}
360
361static int parse_mount_options(struct ceph_mount_options **pfsopt,
362 struct ceph_options **popt,
363 int flags, char *options,
3f384954 364 const char *dev_name)
3d14c5d2
YS
365{
366 struct ceph_mount_options *fsopt;
367 const char *dev_name_end;
c98f533c
AE
368 int err;
369
370 if (!dev_name || !*dev_name)
371 return -EINVAL;
3d14c5d2
YS
372
373 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
374 if (!fsopt)
375 return -ENOMEM;
376
377 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
378
80db8bea
NW
379 fsopt->sb_flags = flags;
380 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
3d14c5d2 381
80db8bea
NW
382 fsopt->rsize = CEPH_RSIZE_DEFAULT;
383 fsopt->rasize = CEPH_RASIZE_DEFAULT;
384 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
a149bb9a
SK
385 if (!fsopt->snapdir_name) {
386 err = -ENOMEM;
387 goto out;
388 }
389
50aac4fe
SW
390 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
391 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
80db8bea
NW
392 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
393 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
394 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
395 fsopt->congestion_kb = default_congestion_kb();
396
c98f533c
AE
397 /*
398 * Distinguish the server list from the path in "dev_name".
399 * Internally we do not include the leading '/' in the path.
400 *
401 * "dev_name" will look like:
402 * <server_spec>[,<server_spec>...]:[<path>]
403 * where
404 * <server_spec> is <ip>[:<port>]
405 * <path> is optional, but if present must begin with '/'
406 */
407 dev_name_end = strchr(dev_name, '/');
408 if (dev_name_end) {
ce2728aa
YZ
409 if (strlen(dev_name_end) > 1) {
410 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
411 if (!fsopt->server_path) {
412 err = -ENOMEM;
413 goto out;
414 }
3f384954 415 }
c98f533c 416 } else {
c98f533c 417 dev_name_end = dev_name + strlen(dev_name);
c98f533c 418 }
80db8bea 419 err = -EINVAL;
c98f533c 420 dev_name_end--; /* back up to ':' separator */
54464296 421 if (dev_name_end < dev_name || *dev_name_end != ':') {
c98f533c 422 pr_err("device name is missing path (no : separator in %s)\n",
80db8bea
NW
423 dev_name);
424 goto out;
425 }
3d14c5d2 426 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
3f384954
YZ
427 if (fsopt->server_path)
428 dout("server path '%s'\n", fsopt->server_path);
16725b9d 429
ee57741c 430 *popt = ceph_parse_options(options, dev_name, dev_name_end,
3d14c5d2 431 parse_fsopt_token, (void *)fsopt);
ee57741c
AE
432 if (IS_ERR(*popt)) {
433 err = PTR_ERR(*popt);
3d14c5d2 434 goto out;
ee57741c 435 }
3d14c5d2
YS
436
437 /* success */
438 *pfsopt = fsopt;
439 return 0;
16725b9d 440
7b813c46 441out:
3d14c5d2
YS
442 destroy_mount_options(fsopt);
443 return err;
16725b9d
SW
444}
445
3d14c5d2
YS
446/**
447 * ceph_show_options - Show mount options in /proc/mounts
448 * @m: seq_file to write to
34c80b1d 449 * @root: root of that (sub)tree
3d14c5d2 450 */
34c80b1d 451static int ceph_show_options(struct seq_file *m, struct dentry *root)
16725b9d 452{
34c80b1d 453 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
3d14c5d2 454 struct ceph_mount_options *fsopt = fsc->mount_options;
ff40f9ae
ID
455 size_t pos;
456 int ret;
457
458 /* a comma between MNT/MS and client options */
459 seq_putc(m, ',');
460 pos = m->count;
461
462 ret = ceph_print_client_options(m, fsc->client);
463 if (ret)
464 return ret;
465
466 /* retract our comma if no client options */
467 if (m->count == pos)
468 m->count--;
3d14c5d2
YS
469
470 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
471 seq_puts(m, ",dirstat");
133e9156
YZ
472 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
473 seq_puts(m, ",rbytes");
3d14c5d2
YS
474 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
475 seq_puts(m, ",noasyncreaddir");
ff7eeb82 476 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
a40dc6cc 477 seq_puts(m, ",nodcache");
99ccbd22
MT
478 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
479 seq_puts(m, ",fsc");
10183a69
YZ
480 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
481 seq_puts(m, ",nopoolperm");
3d14c5d2 482
45195e42
SW
483#ifdef CONFIG_CEPH_FS_POSIX_ACL
484 if (fsopt->sb_flags & MS_POSIXACL)
485 seq_puts(m, ",acl");
486 else
487 seq_puts(m, ",noacl");
488#endif
489
430afbad
YZ
490 if (fsopt->mds_namespace)
491 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
3d14c5d2
YS
492 if (fsopt->wsize)
493 seq_printf(m, ",wsize=%d", fsopt->wsize);
80456f86 494 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
3d14c5d2 495 seq_printf(m, ",rsize=%d", fsopt->rsize);
83817e35 496 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
2151937d 497 seq_printf(m, ",rasize=%d", fsopt->rasize);
3d14c5d2
YS
498 if (fsopt->congestion_kb != default_congestion_kb())
499 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
500 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
501 seq_printf(m, ",caps_wanted_delay_min=%d",
502 fsopt->caps_wanted_delay_min);
503 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
504 seq_printf(m, ",caps_wanted_delay_max=%d",
505 fsopt->caps_wanted_delay_max);
506 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
507 seq_printf(m, ",cap_release_safety=%d",
508 fsopt->cap_release_safety);
509 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
510 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
511 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
512 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
513 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
a068acf2 514 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
ff40f9ae 515
3d14c5d2 516 return 0;
16725b9d
SW
517}
518
519/*
3d14c5d2
YS
520 * handle any mon messages the standard library doesn't understand.
521 * return error if we don't either.
16725b9d 522 */
3d14c5d2 523static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
16725b9d 524{
3d14c5d2
YS
525 struct ceph_fs_client *fsc = client->private;
526 int type = le16_to_cpu(msg->hdr.type);
527
528 switch (type) {
529 case CEPH_MSG_MDS_MAP:
430afbad
YZ
530 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
531 return 0;
532 case CEPH_MSG_FS_MAP_USER:
533 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
3d14c5d2 534 return 0;
3d14c5d2
YS
535 default:
536 return -1;
537 }
538}
539
540/*
541 * create a new fs client
542 */
0c6d4b4e 543static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
3d14c5d2
YS
544 struct ceph_options *opt)
545{
546 struct ceph_fs_client *fsc;
12b4629a 547 const u64 supported_features =
d463a43d
YZ
548 CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH |
549 CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA;
12b4629a 550 const u64 required_features = 0;
3bf53337
AE
551 int page_count;
552 size_t size;
16725b9d
SW
553 int err = -ENOMEM;
554
3d14c5d2
YS
555 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
556 if (!fsc)
16725b9d
SW
557 return ERR_PTR(-ENOMEM);
558
6ab00d46
SW
559 fsc->client = ceph_create_client(opt, fsc, supported_features,
560 required_features);
3d14c5d2
YS
561 if (IS_ERR(fsc->client)) {
562 err = PTR_ERR(fsc->client);
563 goto fail;
564 }
565 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
430afbad
YZ
566
567 if (fsopt->mds_namespace == NULL) {
568 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
569 0, true);
570 } else {
571 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
572 0, false);
573 }
16725b9d 574
3d14c5d2 575 fsc->mount_options = fsopt;
16725b9d 576
3d14c5d2
YS
577 fsc->sb = NULL;
578 fsc->mount_state = CEPH_MOUNT_MOUNTING;
16725b9d 579
3d14c5d2 580 atomic_long_set(&fsc->writeback_count, 0);
16725b9d 581
3d14c5d2 582 err = bdi_init(&fsc->backing_dev_info);
859e7b14 583 if (err < 0)
3d14c5d2 584 goto fail_client;
859e7b14 585
16725b9d 586 err = -ENOMEM;
01e6acc4
TH
587 /*
588 * The number of concurrent works can be high but they don't need
589 * to be processed in parallel, limit concurrency.
590 */
591 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
3d14c5d2 592 if (fsc->wb_wq == NULL)
859e7b14 593 goto fail_bdi;
01e6acc4 594 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
3d14c5d2 595 if (fsc->pg_inv_wq == NULL)
16725b9d 596 goto fail_wb_wq;
01e6acc4 597 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
3d14c5d2 598 if (fsc->trunc_wq == NULL)
16725b9d
SW
599 goto fail_pg_inv_wq;
600
b9bfb93c
SW
601 /* set up mempools */
602 err = -ENOMEM;
09cbfeaf 603 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
3bf53337
AE
604 size = sizeof (struct page *) * (page_count ? page_count : 1);
605 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
3d14c5d2 606 if (!fsc->wb_pagevec_pool)
b9bfb93c
SW
607 goto fail_trunc_wq;
608
99ccbd22
MT
609 /* setup fscache */
610 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
611 (ceph_fscache_register_fs(fsc) != 0))
612 goto fail_fscache;
613
85ccce43 614 /* caps */
3d14c5d2
YS
615 fsc->min_caps = fsopt->max_readdir;
616
617 return fsc;
b9bfb93c 618
99ccbd22
MT
619fail_fscache:
620 ceph_fscache_unregister_fs(fsc);
16725b9d 621fail_trunc_wq:
3d14c5d2 622 destroy_workqueue(fsc->trunc_wq);
16725b9d 623fail_pg_inv_wq:
3d14c5d2 624 destroy_workqueue(fsc->pg_inv_wq);
16725b9d 625fail_wb_wq:
3d14c5d2 626 destroy_workqueue(fsc->wb_wq);
859e7b14 627fail_bdi:
3d14c5d2
YS
628 bdi_destroy(&fsc->backing_dev_info);
629fail_client:
630 ceph_destroy_client(fsc->client);
16725b9d 631fail:
3d14c5d2 632 kfree(fsc);
16725b9d
SW
633 return ERR_PTR(err);
634}
635
0c6d4b4e 636static void destroy_fs_client(struct ceph_fs_client *fsc)
16725b9d 637{
3d14c5d2 638 dout("destroy_fs_client %p\n", fsc);
16725b9d 639
99ccbd22
MT
640 ceph_fscache_unregister_fs(fsc);
641
3d14c5d2
YS
642 destroy_workqueue(fsc->wb_wq);
643 destroy_workqueue(fsc->pg_inv_wq);
644 destroy_workqueue(fsc->trunc_wq);
16725b9d 645
3d14c5d2 646 bdi_destroy(&fsc->backing_dev_info);
a922d38f 647
3d14c5d2 648 mempool_destroy(fsc->wb_pagevec_pool);
16725b9d 649
3d14c5d2 650 destroy_mount_options(fsc->mount_options);
5dfc589a 651
3d14c5d2 652 ceph_fs_debugfs_cleanup(fsc);
16725b9d 653
3d14c5d2 654 ceph_destroy_client(fsc->client);
16725b9d 655
3d14c5d2
YS
656 kfree(fsc);
657 dout("destroy_fs_client %p done\n", fsc);
16725b9d
SW
658}
659
0743304d 660/*
3d14c5d2 661 * caches
0743304d 662 */
3d14c5d2
YS
663struct kmem_cache *ceph_inode_cachep;
664struct kmem_cache *ceph_cap_cachep;
f66fd9f0 665struct kmem_cache *ceph_cap_flush_cachep;
3d14c5d2
YS
666struct kmem_cache *ceph_dentry_cachep;
667struct kmem_cache *ceph_file_cachep;
668
669static void ceph_inode_init_once(void *foo)
0743304d 670{
3d14c5d2
YS
671 struct ceph_inode_info *ci = foo;
672 inode_init_once(&ci->vfs_inode);
673}
674
675static int __init init_caches(void)
676{
99ccbd22
MT
677 int error = -ENOMEM;
678
3d14c5d2
YS
679 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
680 sizeof(struct ceph_inode_info),
681 __alignof__(struct ceph_inode_info),
5d097056
VD
682 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
683 SLAB_ACCOUNT, ceph_inode_init_once);
3d14c5d2
YS
684 if (ceph_inode_cachep == NULL)
685 return -ENOMEM;
686
687 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
688 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
689 if (ceph_cap_cachep == NULL)
690 goto bad_cap;
f66fd9f0
YZ
691 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
692 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
693 if (ceph_cap_flush_cachep == NULL)
694 goto bad_cap_flush;
3d14c5d2
YS
695
696 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
697 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
698 if (ceph_dentry_cachep == NULL)
699 goto bad_dentry;
700
6b1a9a6c
NB
701 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
702
3d14c5d2
YS
703 if (ceph_file_cachep == NULL)
704 goto bad_file;
705
99ccbd22
MT
706 if ((error = ceph_fscache_register()))
707 goto bad_file;
3d14c5d2 708
99ccbd22 709 return 0;
3d14c5d2
YS
710bad_file:
711 kmem_cache_destroy(ceph_dentry_cachep);
712bad_dentry:
f66fd9f0
YZ
713 kmem_cache_destroy(ceph_cap_flush_cachep);
714bad_cap_flush:
3d14c5d2
YS
715 kmem_cache_destroy(ceph_cap_cachep);
716bad_cap:
717 kmem_cache_destroy(ceph_inode_cachep);
99ccbd22 718 return error;
0743304d
SW
719}
720
3d14c5d2
YS
721static void destroy_caches(void)
722{
8c0a8537
KS
723 /*
724 * Make sure all delayed rcu free inodes are flushed before we
725 * destroy cache.
726 */
727 rcu_barrier();
99ccbd22 728
3d14c5d2
YS
729 kmem_cache_destroy(ceph_inode_cachep);
730 kmem_cache_destroy(ceph_cap_cachep);
f66fd9f0 731 kmem_cache_destroy(ceph_cap_flush_cachep);
3d14c5d2
YS
732 kmem_cache_destroy(ceph_dentry_cachep);
733 kmem_cache_destroy(ceph_file_cachep);
99ccbd22
MT
734
735 ceph_fscache_unregister();
3d14c5d2
YS
736}
737
738
16725b9d 739/*
3d14c5d2
YS
740 * ceph_umount_begin - initiate forced umount. Tear down down the
741 * mount, skipping steps that may hang while waiting for server(s).
16725b9d 742 */
3d14c5d2 743static void ceph_umount_begin(struct super_block *sb)
16725b9d 744{
3d14c5d2
YS
745 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
746
747 dout("ceph_umount_begin - starting forced umount\n");
748 if (!fsc)
749 return;
750 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
48fec5d0 751 ceph_mdsc_force_umount(fsc->mdsc);
3d14c5d2 752 return;
16725b9d
SW
753}
754
3d14c5d2
YS
755static const struct super_operations ceph_super_ops = {
756 .alloc_inode = ceph_alloc_inode,
757 .destroy_inode = ceph_destroy_inode,
758 .write_inode = ceph_write_inode,
9f12bd11 759 .drop_inode = ceph_drop_inode,
9a5530c6 760 .evict_inode = ceph_evict_inode,
3d14c5d2
YS
761 .sync_fs = ceph_sync_fs,
762 .put_super = ceph_put_super,
763 .show_options = ceph_show_options,
764 .statfs = ceph_statfs,
765 .umount_begin = ceph_umount_begin,
766};
767
16725b9d
SW
768/*
769 * Bootstrap mount by opening the root directory. Note the mount
770 * @started time from caller, and time out if this takes too long.
771 */
3d14c5d2 772static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
16725b9d
SW
773 const char *path,
774 unsigned long started)
775{
3d14c5d2 776 struct ceph_mds_client *mdsc = fsc->mdsc;
16725b9d
SW
777 struct ceph_mds_request *req = NULL;
778 int err;
779 struct dentry *root;
780
781 /* open dir */
782 dout("open_root_inode opening '%s'\n", path);
783 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
784 if (IS_ERR(req))
7e34bc52 785 return ERR_CAST(req);
16725b9d 786 req->r_path1 = kstrdup(path, GFP_NOFS);
a149bb9a
SK
787 if (!req->r_path1) {
788 root = ERR_PTR(-ENOMEM);
789 goto out;
790 }
791
16725b9d
SW
792 req->r_ino1.ino = CEPH_INO_ROOT;
793 req->r_ino1.snap = CEPH_NOSNAP;
794 req->r_started = started;
a319bf56 795 req->r_timeout = fsc->client->options->mount_timeout;
16725b9d
SW
796 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
797 req->r_num_caps = 2;
798 err = ceph_mdsc_do_request(mdsc, NULL, req);
799 if (err == 0) {
3c5184ef
AV
800 struct inode *inode = req->r_target_inode;
801 req->r_target_inode = NULL;
16725b9d 802 dout("open_root_inode success\n");
ce2728aa
YZ
803 root = d_make_root(inode);
804 if (!root) {
805 root = ERR_PTR(-ENOMEM);
806 goto out;
774ac21d 807 }
16725b9d
SW
808 dout("open_root_inode success, root dentry is %p\n", root);
809 } else {
810 root = ERR_PTR(err);
811 }
3c5184ef 812out:
16725b9d
SW
813 ceph_mdsc_put_request(req);
814 return root;
815}
816
3d14c5d2
YS
817
818
819
16725b9d
SW
820/*
821 * mount: join the ceph cluster, and open root directory.
822 */
3f384954 823static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
16725b9d 824{
16725b9d 825 int err;
16725b9d
SW
826 unsigned long started = jiffies; /* note the start time */
827 struct dentry *root;
3d14c5d2 828 int first = 0; /* first vfsmount for this super_block */
16725b9d 829
132ca7e1 830 dout("mount start %p\n", fsc);
3d14c5d2 831 mutex_lock(&fsc->client->mount_mutex);
16725b9d 832
132ca7e1 833 if (!fsc->sb->s_root) {
ce2728aa 834 const char *path;
132ca7e1
YZ
835 err = __ceph_open_session(fsc->client, started);
836 if (err < 0)
837 goto out;
16725b9d 838
ce2728aa
YZ
839 if (!fsc->mount_options->server_path) {
840 path = "";
841 dout("mount opening path \\t\n");
842 } else {
843 path = fsc->mount_options->server_path + 1;
844 dout("mount opening path %s\n", path);
845 }
846 root = open_root_dentry(fsc, path, started);
132ca7e1
YZ
847 if (IS_ERR(root)) {
848 err = PTR_ERR(root);
849 goto out;
850 }
ce2728aa 851 fsc->sb->s_root = dget(root);
3d14c5d2
YS
852 first = 1;
853
854 err = ceph_fs_debugfs_init(fsc);
855 if (err < 0)
856 goto fail;
31ca5878
GU
857 } else {
858 root = dget(fsc->sb->s_root);
3d14c5d2 859 }
16725b9d 860
3d14c5d2 861 fsc->mount_state = CEPH_MOUNT_MOUNTED;
16725b9d 862 dout("mount success\n");
a7f9fb20
AV
863 mutex_unlock(&fsc->client->mount_mutex);
864 return root;
16725b9d 865
3d14c5d2
YS
866fail:
867 if (first) {
868 dput(fsc->sb->s_root);
869 fsc->sb->s_root = NULL;
870 }
132ca7e1
YZ
871out:
872 mutex_unlock(&fsc->client->mount_mutex);
873 return ERR_PTR(err);
16725b9d
SW
874}
875
876static int ceph_set_super(struct super_block *s, void *data)
877{
3d14c5d2 878 struct ceph_fs_client *fsc = data;
16725b9d
SW
879 int ret;
880
881 dout("set_super %p data %p\n", s, data);
882
3d14c5d2 883 s->s_flags = fsc->mount_options->sb_flags;
16725b9d
SW
884 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
885
7221fe4c 886 s->s_xattr = ceph_xattr_handlers;
3d14c5d2
YS
887 s->s_fs_info = fsc;
888 fsc->sb = s;
16725b9d
SW
889
890 s->s_op = &ceph_super_ops;
18fc8abd 891 s->s_d_op = &ceph_dentry_ops;
16725b9d
SW
892 s->s_export_op = &ceph_export_ops;
893
894 s->s_time_gran = 1000; /* 1000 ns == 1 us */
895
896 ret = set_anon_super(s, NULL); /* what is that second arg for? */
897 if (ret != 0)
898 goto fail;
899
900 return ret;
901
902fail:
903 s->s_fs_info = NULL;
3d14c5d2 904 fsc->sb = NULL;
16725b9d
SW
905 return ret;
906}
907
908/*
909 * share superblock if same fs AND options
910 */
911static int ceph_compare_super(struct super_block *sb, void *data)
912{
3d14c5d2
YS
913 struct ceph_fs_client *new = data;
914 struct ceph_mount_options *fsopt = new->mount_options;
915 struct ceph_options *opt = new->client->options;
916 struct ceph_fs_client *other = ceph_sb_to_client(sb);
16725b9d
SW
917
918 dout("ceph_compare_super %p\n", sb);
3d14c5d2
YS
919
920 if (compare_mount_options(fsopt, opt, other)) {
921 dout("monitor(s)/mount options don't match\n");
922 return 0;
16725b9d 923 }
3d14c5d2
YS
924 if ((opt->flags & CEPH_OPT_FSID) &&
925 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
926 dout("fsid doesn't match\n");
927 return 0;
928 }
929 if (fsopt->sb_flags != other->mount_options->sb_flags) {
16725b9d
SW
930 dout("flags differ\n");
931 return 0;
932 }
933 return 1;
934}
935
936/*
937 * construct our own bdi so we can control readahead, etc.
938 */
00d5643e 939static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
31e0cf8f 940
3d14c5d2
YS
941static int ceph_register_bdi(struct super_block *sb,
942 struct ceph_fs_client *fsc)
16725b9d
SW
943{
944 int err;
945
83817e35 946 /* set ra_pages based on rasize mount option? */
09cbfeaf 947 if (fsc->mount_options->rasize >= PAGE_SIZE)
3d14c5d2 948 fsc->backing_dev_info.ra_pages =
09cbfeaf 949 (fsc->mount_options->rasize + PAGE_SIZE - 1)
16725b9d 950 >> PAGE_SHIFT;
e9852227
YS
951 else
952 fsc->backing_dev_info.ra_pages =
09cbfeaf 953 VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
e9852227 954
d2cc4dde 955 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
31e0cf8f 956 atomic_long_inc_return(&bdi_seq));
5dfc589a 957 if (!err)
3d14c5d2 958 sb->s_bdi = &fsc->backing_dev_info;
16725b9d
SW
959 return err;
960}
961
a7f9fb20
AV
962static struct dentry *ceph_mount(struct file_system_type *fs_type,
963 int flags, const char *dev_name, void *data)
16725b9d
SW
964{
965 struct super_block *sb;
3d14c5d2 966 struct ceph_fs_client *fsc;
a7f9fb20 967 struct dentry *res;
16725b9d
SW
968 int err;
969 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
3d14c5d2
YS
970 struct ceph_mount_options *fsopt = NULL;
971 struct ceph_options *opt = NULL;
16725b9d 972
a7f9fb20 973 dout("ceph_mount\n");
45195e42
SW
974
975#ifdef CONFIG_CEPH_FS_POSIX_ACL
976 flags |= MS_POSIXACL;
977#endif
3f384954 978 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
a7f9fb20
AV
979 if (err < 0) {
980 res = ERR_PTR(err);
6b805185 981 goto out_final;
a7f9fb20 982 }
16725b9d
SW
983
984 /* create client (which we may/may not use) */
3d14c5d2
YS
985 fsc = create_fs_client(fsopt, opt);
986 if (IS_ERR(fsc)) {
a7f9fb20 987 res = ERR_CAST(fsc);
259a187a
NW
988 destroy_mount_options(fsopt);
989 ceph_destroy_options(opt);
6b805185
SW
990 goto out_final;
991 }
16725b9d 992
3d14c5d2 993 err = ceph_mdsc_init(fsc);
a7f9fb20
AV
994 if (err < 0) {
995 res = ERR_PTR(err);
3d14c5d2 996 goto out;
a7f9fb20 997 }
3d14c5d2
YS
998
999 if (ceph_test_opt(fsc->client, NOSHARE))
16725b9d 1000 compare_super = NULL;
9249e17f 1001 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
16725b9d 1002 if (IS_ERR(sb)) {
a7f9fb20 1003 res = ERR_CAST(sb);
16725b9d
SW
1004 goto out;
1005 }
1006
3d14c5d2
YS
1007 if (ceph_sb_to_client(sb) != fsc) {
1008 ceph_mdsc_destroy(fsc);
1009 destroy_fs_client(fsc);
1010 fsc = ceph_sb_to_client(sb);
1011 dout("get_sb got existing client %p\n", fsc);
16725b9d 1012 } else {
3d14c5d2
YS
1013 dout("get_sb using new client %p\n", fsc);
1014 err = ceph_register_bdi(sb, fsc);
a7f9fb20
AV
1015 if (err < 0) {
1016 res = ERR_PTR(err);
16725b9d 1017 goto out_splat;
a7f9fb20 1018 }
16725b9d
SW
1019 }
1020
3f384954 1021 res = ceph_real_mount(fsc);
a7f9fb20 1022 if (IS_ERR(res))
16725b9d 1023 goto out_splat;
a7f9fb20 1024 dout("root %p inode %p ino %llx.%llx\n", res,
2b0143b5 1025 d_inode(res), ceph_vinop(d_inode(res)));
a7f9fb20 1026 return res;
16725b9d
SW
1027
1028out_splat:
3d14c5d2 1029 ceph_mdsc_close_sessions(fsc->mdsc);
3981f2e2 1030 deactivate_locked_super(sb);
16725b9d
SW
1031 goto out_final;
1032
1033out:
3d14c5d2
YS
1034 ceph_mdsc_destroy(fsc);
1035 destroy_fs_client(fsc);
16725b9d 1036out_final:
a7f9fb20
AV
1037 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1038 return res;
16725b9d
SW
1039}
1040
1041static void ceph_kill_sb(struct super_block *s)
1042{
3d14c5d2 1043 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
e4d27509
CH
1044 dev_t dev = s->s_dev;
1045
16725b9d 1046 dout("kill_sb %p\n", s);
e4d27509 1047
3d14c5d2 1048 ceph_mdsc_pre_umount(fsc->mdsc);
e4d27509 1049 generic_shutdown_super(s);
3d14c5d2 1050 ceph_mdsc_destroy(fsc);
e4d27509 1051
3d14c5d2 1052 destroy_fs_client(fsc);
e4d27509 1053 free_anon_bdev(dev);
16725b9d
SW
1054}
1055
1056static struct file_system_type ceph_fs_type = {
1057 .owner = THIS_MODULE,
1058 .name = "ceph",
a7f9fb20 1059 .mount = ceph_mount,
16725b9d
SW
1060 .kill_sb = ceph_kill_sb,
1061 .fs_flags = FS_RENAME_DOES_D_MOVE,
1062};
7f78e035 1063MODULE_ALIAS_FS("ceph");
16725b9d 1064
16725b9d
SW
1065static int __init init_ceph(void)
1066{
3d14c5d2 1067 int ret = init_caches();
16725b9d 1068 if (ret)
3d14c5d2 1069 goto out;
16725b9d 1070
eb13e832 1071 ceph_flock_init();
3ce6cd12 1072 ceph_xattr_init();
16725b9d
SW
1073 ret = register_filesystem(&ceph_fs_type);
1074 if (ret)
34b759b4 1075 goto out_xattr;
16725b9d 1076
3d14c5d2
YS
1077 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1078
16725b9d
SW
1079 return 0;
1080
97c85a82 1081out_xattr:
3ce6cd12 1082 ceph_xattr_exit();
16725b9d 1083 destroy_caches();
16725b9d
SW
1084out:
1085 return ret;
1086}
1087
1088static void __exit exit_ceph(void)
1089{
1090 dout("exit_ceph\n");
1091 unregister_filesystem(&ceph_fs_type);
3ce6cd12 1092 ceph_xattr_exit();
16725b9d 1093 destroy_caches();
16725b9d
SW
1094}
1095
1096module_init(init_ceph);
1097module_exit(exit_ceph);
1098
1099MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1100MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1101MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1102MODULE_DESCRIPTION("Ceph filesystem for Linux");
1103MODULE_LICENSE("GPL");