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Linux 4.19-rc7
[linux-2.6/btrfs-unstable.git] / fs / ceph / super.c
blobeab1359d05532afb6960c7acfb5c4fee2891eac9
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 #include "cache.h"
21
22 #include <linux/ceph/ceph_features.h>
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>
27
28 /*
29 * Ceph superblock operations
30 *
31 * Handle the basics of mounting, unmounting.
32 */
33
34 /*
35 * super ops
36 */
37 static void ceph_put_super(struct super_block *s)
38 {
39 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
40
41 dout("put_super\n");
42 ceph_mdsc_close_sessions(fsc->mdsc);
43 }
44
45 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
46 {
47 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
48 struct ceph_mon_client *monc = &fsc->client->monc;
49 struct ceph_statfs st;
50 u64 fsid;
51 int err;
52 u64 data_pool;
53
54 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
55 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
56 } else {
57 data_pool = CEPH_NOPOOL;
58 }
59
60 dout("statfs\n");
61 err = ceph_monc_do_statfs(monc, data_pool, &st);
62 if (err < 0)
63 return err;
64
65 /* fill in kstatfs */
66 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
67
68 /*
69 * express utilization in terms of large blocks to avoid
70 * overflow on 32-bit machines.
71 *
72 * NOTE: for the time being, we make bsize == frsize to humor
73 * not-yet-ancient versions of glibc that are broken.
74 * Someday, we will probably want to report a real block
75 * size... whatever that may mean for a network file system!
76 */
77 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
78 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
79
80 /*
81 * By default use root quota for stats; fallback to overall filesystem
82 * usage if using 'noquotadf' mount option or if the root dir doesn't
83 * have max_bytes quota set.
84 */
85 if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
86 !ceph_quota_update_statfs(fsc, buf)) {
87 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
88 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
89 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
90 }
91
92 buf->f_files = le64_to_cpu(st.num_objects);
93 buf->f_ffree = -1;
94 buf->f_namelen = NAME_MAX;
95
96 /* Must convert the fsid, for consistent values across arches */
97 mutex_lock(&monc->mutex);
98 fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
99 le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
100 mutex_unlock(&monc->mutex);
101
102 buf->f_fsid.val[0] = fsid & 0xffffffff;
103 buf->f_fsid.val[1] = fsid >> 32;
104
105 return 0;
106 }
107
108
109 static int ceph_sync_fs(struct super_block *sb, int wait)
110 {
111 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
112
113 if (!wait) {
114 dout("sync_fs (non-blocking)\n");
115 ceph_flush_dirty_caps(fsc->mdsc);
116 dout("sync_fs (non-blocking) done\n");
117 return 0;
118 }
119
120 dout("sync_fs (blocking)\n");
121 ceph_osdc_sync(&fsc->client->osdc);
122 ceph_mdsc_sync(fsc->mdsc);
123 dout("sync_fs (blocking) done\n");
124 return 0;
125 }
126
127 /*
128 * mount options
129 */
130 enum {
131 Opt_wsize,
132 Opt_rsize,
133 Opt_rasize,
134 Opt_caps_wanted_delay_min,
135 Opt_caps_wanted_delay_max,
136 Opt_readdir_max_entries,
137 Opt_readdir_max_bytes,
138 Opt_congestion_kb,
139 Opt_last_int,
140 /* int args above */
141 Opt_snapdirname,
142 Opt_mds_namespace,
143 Opt_fscache_uniq,
144 Opt_last_string,
145 /* string args above */
146 Opt_dirstat,
147 Opt_nodirstat,
148 Opt_rbytes,
149 Opt_norbytes,
150 Opt_asyncreaddir,
151 Opt_noasyncreaddir,
152 Opt_dcache,
153 Opt_nodcache,
154 Opt_ino32,
155 Opt_noino32,
156 Opt_fscache,
157 Opt_nofscache,
158 Opt_poolperm,
159 Opt_nopoolperm,
160 Opt_require_active_mds,
161 Opt_norequire_active_mds,
162 #ifdef CONFIG_CEPH_FS_POSIX_ACL
163 Opt_acl,
164 #endif
165 Opt_noacl,
166 Opt_quotadf,
167 Opt_noquotadf,
168 };
169
170 static match_table_t fsopt_tokens = {
171 {Opt_wsize, "wsize=%d"},
172 {Opt_rsize, "rsize=%d"},
173 {Opt_rasize, "rasize=%d"},
174 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
175 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
176 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
177 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
178 {Opt_congestion_kb, "write_congestion_kb=%d"},
179 /* int args above */
180 {Opt_snapdirname, "snapdirname=%s"},
181 {Opt_mds_namespace, "mds_namespace=%s"},
182 {Opt_fscache_uniq, "fsc=%s"},
183 /* string args above */
184 {Opt_dirstat, "dirstat"},
185 {Opt_nodirstat, "nodirstat"},
186 {Opt_rbytes, "rbytes"},
187 {Opt_norbytes, "norbytes"},
188 {Opt_asyncreaddir, "asyncreaddir"},
189 {Opt_noasyncreaddir, "noasyncreaddir"},
190 {Opt_dcache, "dcache"},
191 {Opt_nodcache, "nodcache"},
192 {Opt_ino32, "ino32"},
193 {Opt_noino32, "noino32"},
194 {Opt_fscache, "fsc"},
195 {Opt_nofscache, "nofsc"},
196 {Opt_poolperm, "poolperm"},
197 {Opt_nopoolperm, "nopoolperm"},
198 {Opt_require_active_mds, "require_active_mds"},
199 {Opt_norequire_active_mds, "norequire_active_mds"},
200 #ifdef CONFIG_CEPH_FS_POSIX_ACL
201 {Opt_acl, "acl"},
202 #endif
203 {Opt_noacl, "noacl"},
204 {Opt_quotadf, "quotadf"},
205 {Opt_noquotadf, "noquotadf"},
206 {-1, NULL}
207 };
208
209 static int parse_fsopt_token(char *c, void *private)
210 {
211 struct ceph_mount_options *fsopt = private;
212 substring_t argstr[MAX_OPT_ARGS];
213 int token, intval, ret;
214
215 token = match_token((char *)c, fsopt_tokens, argstr);
216 if (token < 0)
217 return -EINVAL;
218
219 if (token < Opt_last_int) {
220 ret = match_int(&argstr[0], &intval);
221 if (ret < 0) {
222 pr_err("bad option arg (not int) at '%s'\n", c);
223 return ret;
224 }
225 dout("got int token %d val %d\n", token, intval);
226 } else if (token > Opt_last_int && token < Opt_last_string) {
227 dout("got string token %d val %s\n", token,
228 argstr[0].from);
229 } else {
230 dout("got token %d\n", token);
231 }
232
233 switch (token) {
234 case Opt_snapdirname:
235 kfree(fsopt->snapdir_name);
236 fsopt->snapdir_name = kstrndup(argstr[0].from,
237 argstr[0].to-argstr[0].from,
238 GFP_KERNEL);
239 if (!fsopt->snapdir_name)
240 return -ENOMEM;
241 break;
242 case Opt_mds_namespace:
243 kfree(fsopt->mds_namespace);
244 fsopt->mds_namespace = kstrndup(argstr[0].from,
245 argstr[0].to-argstr[0].from,
246 GFP_KERNEL);
247 if (!fsopt->mds_namespace)
248 return -ENOMEM;
249 break;
250 case Opt_fscache_uniq:
251 kfree(fsopt->fscache_uniq);
252 fsopt->fscache_uniq = kstrndup(argstr[0].from,
253 argstr[0].to-argstr[0].from,
254 GFP_KERNEL);
255 if (!fsopt->fscache_uniq)
256 return -ENOMEM;
257 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
258 break;
259 /* misc */
260 case Opt_wsize:
261 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
262 return -EINVAL;
263 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
264 break;
265 case Opt_rsize:
266 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
267 return -EINVAL;
268 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
269 break;
270 case Opt_rasize:
271 if (intval < 0)
272 return -EINVAL;
273 fsopt->rasize = ALIGN(intval, PAGE_SIZE);
274 break;
275 case Opt_caps_wanted_delay_min:
276 if (intval < 1)
277 return -EINVAL;
278 fsopt->caps_wanted_delay_min = intval;
279 break;
280 case Opt_caps_wanted_delay_max:
281 if (intval < 1)
282 return -EINVAL;
283 fsopt->caps_wanted_delay_max = intval;
284 break;
285 case Opt_readdir_max_entries:
286 if (intval < 1)
287 return -EINVAL;
288 fsopt->max_readdir = intval;
289 break;
290 case Opt_readdir_max_bytes:
291 if (intval < (int)PAGE_SIZE && intval != 0)
292 return -EINVAL;
293 fsopt->max_readdir_bytes = intval;
294 break;
295 case Opt_congestion_kb:
296 if (intval < 1024) /* at least 1M */
297 return -EINVAL;
298 fsopt->congestion_kb = intval;
299 break;
300 case Opt_dirstat:
301 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
302 break;
303 case Opt_nodirstat:
304 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
305 break;
306 case Opt_rbytes:
307 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
308 break;
309 case Opt_norbytes:
310 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
311 break;
312 case Opt_asyncreaddir:
313 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
314 break;
315 case Opt_noasyncreaddir:
316 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
317 break;
318 case Opt_dcache:
319 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
320 break;
321 case Opt_nodcache:
322 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
323 break;
324 case Opt_ino32:
325 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
326 break;
327 case Opt_noino32:
328 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
329 break;
330 case Opt_fscache:
331 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
332 kfree(fsopt->fscache_uniq);
333 fsopt->fscache_uniq = NULL;
334 break;
335 case Opt_nofscache:
336 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
337 kfree(fsopt->fscache_uniq);
338 fsopt->fscache_uniq = NULL;
339 break;
340 case Opt_poolperm:
341 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
342 break;
343 case Opt_nopoolperm:
344 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
345 break;
346 case Opt_require_active_mds:
347 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
348 break;
349 case Opt_norequire_active_mds:
350 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
351 break;
352 case Opt_quotadf:
353 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
354 break;
355 case Opt_noquotadf:
356 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
357 break;
358 #ifdef CONFIG_CEPH_FS_POSIX_ACL
359 case Opt_acl:
360 fsopt->sb_flags |= SB_POSIXACL;
361 break;
362 #endif
363 case Opt_noacl:
364 fsopt->sb_flags &= ~SB_POSIXACL;
365 break;
366 default:
367 BUG_ON(token);
368 }
369 return 0;
370 }
371
372 static void destroy_mount_options(struct ceph_mount_options *args)
373 {
374 dout("destroy_mount_options %p\n", args);
375 kfree(args->snapdir_name);
376 kfree(args->mds_namespace);
377 kfree(args->server_path);
378 kfree(args->fscache_uniq);
379 kfree(args);
380 }
381
382 static int strcmp_null(const char *s1, const char *s2)
383 {
384 if (!s1 && !s2)
385 return 0;
386 if (s1 && !s2)
387 return -1;
388 if (!s1 && s2)
389 return 1;
390 return strcmp(s1, s2);
391 }
392
393 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
394 struct ceph_options *new_opt,
395 struct ceph_fs_client *fsc)
396 {
397 struct ceph_mount_options *fsopt1 = new_fsopt;
398 struct ceph_mount_options *fsopt2 = fsc->mount_options;
399 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
400 int ret;
401
402 ret = memcmp(fsopt1, fsopt2, ofs);
403 if (ret)
404 return ret;
405
406 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
407 if (ret)
408 return ret;
409 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
410 if (ret)
411 return ret;
412 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
413 if (ret)
414 return ret;
415 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
416 if (ret)
417 return ret;
418
419 return ceph_compare_options(new_opt, fsc->client);
420 }
421
422 static int parse_mount_options(struct ceph_mount_options **pfsopt,
423 struct ceph_options **popt,
424 int flags, char *options,
425 const char *dev_name)
426 {
427 struct ceph_mount_options *fsopt;
428 const char *dev_name_end;
429 int err;
430
431 if (!dev_name || !*dev_name)
432 return -EINVAL;
433
434 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
435 if (!fsopt)
436 return -ENOMEM;
437
438 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
439
440 fsopt->sb_flags = flags;
441 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
442
443 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
444 fsopt->rsize = CEPH_MAX_READ_SIZE;
445 fsopt->rasize = CEPH_RASIZE_DEFAULT;
446 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
447 if (!fsopt->snapdir_name) {
448 err = -ENOMEM;
449 goto out;
450 }
451
452 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
453 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
454 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
455 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
456 fsopt->congestion_kb = default_congestion_kb();
457
458 /*
459 * Distinguish the server list from the path in "dev_name".
460 * Internally we do not include the leading '/' in the path.
461 *
462 * "dev_name" will look like:
463 * <server_spec>[,<server_spec>...]:[<path>]
464 * where
465 * <server_spec> is <ip>[:<port>]
466 * <path> is optional, but if present must begin with '/'
467 */
468 dev_name_end = strchr(dev_name, '/');
469 if (dev_name_end) {
470 if (strlen(dev_name_end) > 1) {
471 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
472 if (!fsopt->server_path) {
473 err = -ENOMEM;
474 goto out;
475 }
476 }
477 } else {
478 dev_name_end = dev_name + strlen(dev_name);
479 }
480 err = -EINVAL;
481 dev_name_end--; /* back up to ':' separator */
482 if (dev_name_end < dev_name || *dev_name_end != ':') {
483 pr_err("device name is missing path (no : separator in %s)\n",
484 dev_name);
485 goto out;
486 }
487 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
488 if (fsopt->server_path)
489 dout("server path '%s'\n", fsopt->server_path);
490
491 *popt = ceph_parse_options(options, dev_name, dev_name_end,
492 parse_fsopt_token, (void *)fsopt);
493 if (IS_ERR(*popt)) {
494 err = PTR_ERR(*popt);
495 goto out;
496 }
497
498 /* success */
499 *pfsopt = fsopt;
500 return 0;
501
502 out:
503 destroy_mount_options(fsopt);
504 return err;
505 }
506
507 /**
508 * ceph_show_options - Show mount options in /proc/mounts
509 * @m: seq_file to write to
510 * @root: root of that (sub)tree
511 */
512 static int ceph_show_options(struct seq_file *m, struct dentry *root)
513 {
514 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
515 struct ceph_mount_options *fsopt = fsc->mount_options;
516 size_t pos;
517 int ret;
518
519 /* a comma between MNT/MS and client options */
520 seq_putc(m, ',');
521 pos = m->count;
522
523 ret = ceph_print_client_options(m, fsc->client);
524 if (ret)
525 return ret;
526
527 /* retract our comma if no client options */
528 if (m->count == pos)
529 m->count--;
530
531 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
532 seq_puts(m, ",dirstat");
533 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
534 seq_puts(m, ",rbytes");
535 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
536 seq_puts(m, ",noasyncreaddir");
537 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
538 seq_puts(m, ",nodcache");
539 if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
540 seq_puts(m, ",ino32");
541 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
542 seq_show_option(m, "fsc", fsopt->fscache_uniq);
543 }
544 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
545 seq_puts(m, ",nopoolperm");
546 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
547 seq_puts(m, ",noquotadf");
548
549 #ifdef CONFIG_CEPH_FS_POSIX_ACL
550 if (fsopt->sb_flags & SB_POSIXACL)
551 seq_puts(m, ",acl");
552 else
553 seq_puts(m, ",noacl");
554 #endif
555
556 if (fsopt->mds_namespace)
557 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
558 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
559 seq_printf(m, ",wsize=%d", fsopt->wsize);
560 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
561 seq_printf(m, ",rsize=%d", fsopt->rsize);
562 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
563 seq_printf(m, ",rasize=%d", fsopt->rasize);
564 if (fsopt->congestion_kb != default_congestion_kb())
565 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
566 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
567 seq_printf(m, ",caps_wanted_delay_min=%d",
568 fsopt->caps_wanted_delay_min);
569 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
570 seq_printf(m, ",caps_wanted_delay_max=%d",
571 fsopt->caps_wanted_delay_max);
572 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
573 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
574 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
575 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
576 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
577 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
578
579 return 0;
580 }
581
582 /*
583 * handle any mon messages the standard library doesn't understand.
584 * return error if we don't either.
585 */
586 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
587 {
588 struct ceph_fs_client *fsc = client->private;
589 int type = le16_to_cpu(msg->hdr.type);
590
591 switch (type) {
592 case CEPH_MSG_MDS_MAP:
593 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
594 return 0;
595 case CEPH_MSG_FS_MAP_USER:
596 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
597 return 0;
598 default:
599 return -1;
600 }
601 }
602
603 /*
604 * create a new fs client
605 *
606 * Success or not, this function consumes @fsopt and @opt.
607 */
608 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
609 struct ceph_options *opt)
610 {
611 struct ceph_fs_client *fsc;
612 int page_count;
613 size_t size;
614 int err;
615
616 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
617 if (!fsc) {
618 err = -ENOMEM;
619 goto fail;
620 }
621
622 fsc->client = ceph_create_client(opt, fsc);
623 if (IS_ERR(fsc->client)) {
624 err = PTR_ERR(fsc->client);
625 goto fail;
626 }
627 opt = NULL; /* fsc->client now owns this */
628
629 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
630 fsc->client->osdc.abort_on_full = true;
631
632 if (!fsopt->mds_namespace) {
633 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
634 0, true);
635 } else {
636 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
637 0, false);
638 }
639
640 fsc->mount_options = fsopt;
641
642 fsc->sb = NULL;
643 fsc->mount_state = CEPH_MOUNT_MOUNTING;
644
645 atomic_long_set(&fsc->writeback_count, 0);
646
647 err = -ENOMEM;
648 /*
649 * The number of concurrent works can be high but they don't need
650 * to be processed in parallel, limit concurrency.
651 */
652 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
653 if (!fsc->wb_wq)
654 goto fail_client;
655 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
656 if (!fsc->pg_inv_wq)
657 goto fail_wb_wq;
658 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
659 if (!fsc->trunc_wq)
660 goto fail_pg_inv_wq;
661
662 /* set up mempools */
663 err = -ENOMEM;
664 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
665 size = sizeof (struct page *) * (page_count ? page_count : 1);
666 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
667 if (!fsc->wb_pagevec_pool)
668 goto fail_trunc_wq;
669
670 /* caps */
671 fsc->min_caps = fsopt->max_readdir;
672
673 return fsc;
674
675 fail_trunc_wq:
676 destroy_workqueue(fsc->trunc_wq);
677 fail_pg_inv_wq:
678 destroy_workqueue(fsc->pg_inv_wq);
679 fail_wb_wq:
680 destroy_workqueue(fsc->wb_wq);
681 fail_client:
682 ceph_destroy_client(fsc->client);
683 fail:
684 kfree(fsc);
685 if (opt)
686 ceph_destroy_options(opt);
687 destroy_mount_options(fsopt);
688 return ERR_PTR(err);
689 }
690
691 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
692 {
693 flush_workqueue(fsc->wb_wq);
694 flush_workqueue(fsc->pg_inv_wq);
695 flush_workqueue(fsc->trunc_wq);
696 }
697
698 static void destroy_fs_client(struct ceph_fs_client *fsc)
699 {
700 dout("destroy_fs_client %p\n", fsc);
701
702 destroy_workqueue(fsc->wb_wq);
703 destroy_workqueue(fsc->pg_inv_wq);
704 destroy_workqueue(fsc->trunc_wq);
705
706 mempool_destroy(fsc->wb_pagevec_pool);
707
708 destroy_mount_options(fsc->mount_options);
709
710 ceph_destroy_client(fsc->client);
711
712 kfree(fsc);
713 dout("destroy_fs_client %p done\n", fsc);
714 }
715
716 /*
717 * caches
718 */
719 struct kmem_cache *ceph_inode_cachep;
720 struct kmem_cache *ceph_cap_cachep;
721 struct kmem_cache *ceph_cap_flush_cachep;
722 struct kmem_cache *ceph_dentry_cachep;
723 struct kmem_cache *ceph_file_cachep;
724 struct kmem_cache *ceph_dir_file_cachep;
725
726 static void ceph_inode_init_once(void *foo)
727 {
728 struct ceph_inode_info *ci = foo;
729 inode_init_once(&ci->vfs_inode);
730 }
731
732 static int __init init_caches(void)
733 {
734 int error = -ENOMEM;
735
736 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
737 sizeof(struct ceph_inode_info),
738 __alignof__(struct ceph_inode_info),
739 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
740 SLAB_ACCOUNT, ceph_inode_init_once);
741 if (!ceph_inode_cachep)
742 return -ENOMEM;
743
744 ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
745 if (!ceph_cap_cachep)
746 goto bad_cap;
747 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
748 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
749 if (!ceph_cap_flush_cachep)
750 goto bad_cap_flush;
751
752 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
753 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
754 if (!ceph_dentry_cachep)
755 goto bad_dentry;
756
757 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
758 if (!ceph_file_cachep)
759 goto bad_file;
760
761 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
762 if (!ceph_dir_file_cachep)
763 goto bad_dir_file;
764
765 error = ceph_fscache_register();
766 if (error)
767 goto bad_fscache;
768
769 return 0;
770
771 bad_fscache:
772 kmem_cache_destroy(ceph_dir_file_cachep);
773 bad_dir_file:
774 kmem_cache_destroy(ceph_file_cachep);
775 bad_file:
776 kmem_cache_destroy(ceph_dentry_cachep);
777 bad_dentry:
778 kmem_cache_destroy(ceph_cap_flush_cachep);
779 bad_cap_flush:
780 kmem_cache_destroy(ceph_cap_cachep);
781 bad_cap:
782 kmem_cache_destroy(ceph_inode_cachep);
783 return error;
784 }
785
786 static void destroy_caches(void)
787 {
788 /*
789 * Make sure all delayed rcu free inodes are flushed before we
790 * destroy cache.
791 */
792 rcu_barrier();
793
794 kmem_cache_destroy(ceph_inode_cachep);
795 kmem_cache_destroy(ceph_cap_cachep);
796 kmem_cache_destroy(ceph_cap_flush_cachep);
797 kmem_cache_destroy(ceph_dentry_cachep);
798 kmem_cache_destroy(ceph_file_cachep);
799 kmem_cache_destroy(ceph_dir_file_cachep);
800
801 ceph_fscache_unregister();
802 }
803
804
805 /*
806 * ceph_umount_begin - initiate forced umount. Tear down down the
807 * mount, skipping steps that may hang while waiting for server(s).
808 */
809 static void ceph_umount_begin(struct super_block *sb)
810 {
811 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
812
813 dout("ceph_umount_begin - starting forced umount\n");
814 if (!fsc)
815 return;
816 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
817 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
818 ceph_mdsc_force_umount(fsc->mdsc);
819 return;
820 }
821
822 static const struct super_operations ceph_super_ops = {
823 .alloc_inode = ceph_alloc_inode,
824 .destroy_inode = ceph_destroy_inode,
825 .write_inode = ceph_write_inode,
826 .drop_inode = ceph_drop_inode,
827 .sync_fs = ceph_sync_fs,
828 .put_super = ceph_put_super,
829 .show_options = ceph_show_options,
830 .statfs = ceph_statfs,
831 .umount_begin = ceph_umount_begin,
832 };
833
834 /*
835 * Bootstrap mount by opening the root directory. Note the mount
836 * @started time from caller, and time out if this takes too long.
837 */
838 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
839 const char *path,
840 unsigned long started)
841 {
842 struct ceph_mds_client *mdsc = fsc->mdsc;
843 struct ceph_mds_request *req = NULL;
844 int err;
845 struct dentry *root;
846
847 /* open dir */
848 dout("open_root_inode opening '%s'\n", path);
849 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
850 if (IS_ERR(req))
851 return ERR_CAST(req);
852 req->r_path1 = kstrdup(path, GFP_NOFS);
853 if (!req->r_path1) {
854 root = ERR_PTR(-ENOMEM);
855 goto out;
856 }
857
858 req->r_ino1.ino = CEPH_INO_ROOT;
859 req->r_ino1.snap = CEPH_NOSNAP;
860 req->r_started = started;
861 req->r_timeout = fsc->client->options->mount_timeout;
862 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
863 req->r_num_caps = 2;
864 err = ceph_mdsc_do_request(mdsc, NULL, req);
865 if (err == 0) {
866 struct inode *inode = req->r_target_inode;
867 req->r_target_inode = NULL;
868 dout("open_root_inode success\n");
869 root = d_make_root(inode);
870 if (!root) {
871 root = ERR_PTR(-ENOMEM);
872 goto out;
873 }
874 dout("open_root_inode success, root dentry is %p\n", root);
875 } else {
876 root = ERR_PTR(err);
877 }
878 out:
879 ceph_mdsc_put_request(req);
880 return root;
881 }
882
883
884
885
886 /*
887 * mount: join the ceph cluster, and open root directory.
888 */
889 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
890 {
891 int err;
892 unsigned long started = jiffies; /* note the start time */
893 struct dentry *root;
894
895 dout("mount start %p\n", fsc);
896 mutex_lock(&fsc->client->mount_mutex);
897
898 if (!fsc->sb->s_root) {
899 const char *path;
900 err = __ceph_open_session(fsc->client, started);
901 if (err < 0)
902 goto out;
903
904 /* setup fscache */
905 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
906 err = ceph_fscache_register_fs(fsc);
907 if (err < 0)
908 goto out;
909 }
910
911 if (!fsc->mount_options->server_path) {
912 path = "";
913 dout("mount opening path \\t\n");
914 } else {
915 path = fsc->mount_options->server_path + 1;
916 dout("mount opening path %s\n", path);
917 }
918
919 err = ceph_fs_debugfs_init(fsc);
920 if (err < 0)
921 goto out;
922
923 root = open_root_dentry(fsc, path, started);
924 if (IS_ERR(root)) {
925 err = PTR_ERR(root);
926 goto out;
927 }
928 fsc->sb->s_root = dget(root);
929 } else {
930 root = dget(fsc->sb->s_root);
931 }
932
933 fsc->mount_state = CEPH_MOUNT_MOUNTED;
934 dout("mount success\n");
935 mutex_unlock(&fsc->client->mount_mutex);
936 return root;
937
938 out:
939 mutex_unlock(&fsc->client->mount_mutex);
940 return ERR_PTR(err);
941 }
942
943 static int ceph_set_super(struct super_block *s, void *data)
944 {
945 struct ceph_fs_client *fsc = data;
946 int ret;
947
948 dout("set_super %p data %p\n", s, data);
949
950 s->s_flags = fsc->mount_options->sb_flags;
951 s->s_maxbytes = MAX_LFS_FILESIZE;
952
953 s->s_xattr = ceph_xattr_handlers;
954 s->s_fs_info = fsc;
955 fsc->sb = s;
956 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
957
958 s->s_op = &ceph_super_ops;
959 s->s_d_op = &ceph_dentry_ops;
960 s->s_export_op = &ceph_export_ops;
961
962 s->s_time_gran = 1000; /* 1000 ns == 1 us */
963
964 ret = set_anon_super(s, NULL); /* what is that second arg for? */
965 if (ret != 0)
966 goto fail;
967
968 return ret;
969
970 fail:
971 s->s_fs_info = NULL;
972 fsc->sb = NULL;
973 return ret;
974 }
975
976 /*
977 * share superblock if same fs AND options
978 */
979 static int ceph_compare_super(struct super_block *sb, void *data)
980 {
981 struct ceph_fs_client *new = data;
982 struct ceph_mount_options *fsopt = new->mount_options;
983 struct ceph_options *opt = new->client->options;
984 struct ceph_fs_client *other = ceph_sb_to_client(sb);
985
986 dout("ceph_compare_super %p\n", sb);
987
988 if (compare_mount_options(fsopt, opt, other)) {
989 dout("monitor(s)/mount options don't match\n");
990 return 0;
991 }
992 if ((opt->flags & CEPH_OPT_FSID) &&
993 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
994 dout("fsid doesn't match\n");
995 return 0;
996 }
997 if (fsopt->sb_flags != other->mount_options->sb_flags) {
998 dout("flags differ\n");
999 return 0;
1000 }
1001 return 1;
1002 }
1003
1004 /*
1005 * construct our own bdi so we can control readahead, etc.
1006 */
1007 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1008
1009 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1010 {
1011 int err;
1012
1013 err = super_setup_bdi_name(sb, "ceph-%ld",
1014 atomic_long_inc_return(&bdi_seq));
1015 if (err)
1016 return err;
1017
1018 /* set ra_pages based on rasize mount option? */
1019 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1020
1021 /* set io_pages based on max osd read size */
1022 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1023
1024 return 0;
1025 }
1026
1027 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1028 int flags, const char *dev_name, void *data)
1029 {
1030 struct super_block *sb;
1031 struct ceph_fs_client *fsc;
1032 struct dentry *res;
1033 int err;
1034 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1035 struct ceph_mount_options *fsopt = NULL;
1036 struct ceph_options *opt = NULL;
1037
1038 dout("ceph_mount\n");
1039
1040 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1041 flags |= SB_POSIXACL;
1042 #endif
1043 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1044 if (err < 0) {
1045 res = ERR_PTR(err);
1046 goto out_final;
1047 }
1048
1049 /* create client (which we may/may not use) */
1050 fsc = create_fs_client(fsopt, opt);
1051 if (IS_ERR(fsc)) {
1052 res = ERR_CAST(fsc);
1053 goto out_final;
1054 }
1055
1056 err = ceph_mdsc_init(fsc);
1057 if (err < 0) {
1058 res = ERR_PTR(err);
1059 goto out;
1060 }
1061
1062 if (ceph_test_opt(fsc->client, NOSHARE))
1063 compare_super = NULL;
1064 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1065 if (IS_ERR(sb)) {
1066 res = ERR_CAST(sb);
1067 goto out;
1068 }
1069
1070 if (ceph_sb_to_client(sb) != fsc) {
1071 ceph_mdsc_destroy(fsc);
1072 destroy_fs_client(fsc);
1073 fsc = ceph_sb_to_client(sb);
1074 dout("get_sb got existing client %p\n", fsc);
1075 } else {
1076 dout("get_sb using new client %p\n", fsc);
1077 err = ceph_setup_bdi(sb, fsc);
1078 if (err < 0) {
1079 res = ERR_PTR(err);
1080 goto out_splat;
1081 }
1082 }
1083
1084 res = ceph_real_mount(fsc);
1085 if (IS_ERR(res))
1086 goto out_splat;
1087 dout("root %p inode %p ino %llx.%llx\n", res,
1088 d_inode(res), ceph_vinop(d_inode(res)));
1089 return res;
1090
1091 out_splat:
1092 ceph_mdsc_close_sessions(fsc->mdsc);
1093 deactivate_locked_super(sb);
1094 goto out_final;
1095
1096 out:
1097 ceph_mdsc_destroy(fsc);
1098 destroy_fs_client(fsc);
1099 out_final:
1100 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1101 return res;
1102 }
1103
1104 static void ceph_kill_sb(struct super_block *s)
1105 {
1106 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1107 dev_t dev = s->s_dev;
1108
1109 dout("kill_sb %p\n", s);
1110
1111 ceph_mdsc_pre_umount(fsc->mdsc);
1112 flush_fs_workqueues(fsc);
1113
1114 generic_shutdown_super(s);
1115
1116 fsc->client->extra_mon_dispatch = NULL;
1117 ceph_fs_debugfs_cleanup(fsc);
1118
1119 ceph_fscache_unregister_fs(fsc);
1120
1121 ceph_mdsc_destroy(fsc);
1122
1123 destroy_fs_client(fsc);
1124 free_anon_bdev(dev);
1125 }
1126
1127 static struct file_system_type ceph_fs_type = {
1128 .owner = THIS_MODULE,
1129 .name = "ceph",
1130 .mount = ceph_mount,
1131 .kill_sb = ceph_kill_sb,
1132 .fs_flags = FS_RENAME_DOES_D_MOVE,
1133 };
1134 MODULE_ALIAS_FS("ceph");
1135
1136 static int __init init_ceph(void)
1137 {
1138 int ret = init_caches();
1139 if (ret)
1140 goto out;
1141
1142 ceph_flock_init();
1143 ceph_xattr_init();
1144 ret = register_filesystem(&ceph_fs_type);
1145 if (ret)
1146 goto out_xattr;
1147
1148 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1149
1150 return 0;
1151
1152 out_xattr:
1153 ceph_xattr_exit();
1154 destroy_caches();
1155 out:
1156 return ret;
1157 }
1158
1159 static void __exit exit_ceph(void)
1160 {
1161 dout("exit_ceph\n");
1162 unregister_filesystem(&ceph_fs_type);
1163 ceph_xattr_exit();
1164 destroy_caches();
1165 }
1166
1167 module_init(init_ceph);
1168 module_exit(exit_ceph);
1169
1170 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1171 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1172 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1173 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1174 MODULE_LICENSE("GPL");
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