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btrfs: no need to check for btrfs_fs_devices::seeding
[linux/fpc-iii.git] / fs / ceph / super.c
bloba62d2a9841dc2b0487181155373c03eac60f8a02
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_monmap *monmap = fsc->client->monc.monmap;
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(&fsc->client->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 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
80 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
81 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
82
83 buf->f_files = le64_to_cpu(st.num_objects);
84 buf->f_ffree = -1;
85 buf->f_namelen = NAME_MAX;
86
87 /* Must convert the fsid, for consistent values across arches */
88 fsid = le64_to_cpu(*(__le64 *)(&monmap->fsid)) ^
89 le64_to_cpu(*((__le64 *)&monmap->fsid + 1));
90 buf->f_fsid.val[0] = fsid & 0xffffffff;
91 buf->f_fsid.val[1] = fsid >> 32;
92
93 return 0;
94 }
95
96
97 static int ceph_sync_fs(struct super_block *sb, int wait)
98 {
99 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
100
101 if (!wait) {
102 dout("sync_fs (non-blocking)\n");
103 ceph_flush_dirty_caps(fsc->mdsc);
104 dout("sync_fs (non-blocking) done\n");
105 return 0;
106 }
107
108 dout("sync_fs (blocking)\n");
109 ceph_osdc_sync(&fsc->client->osdc);
110 ceph_mdsc_sync(fsc->mdsc);
111 dout("sync_fs (blocking) done\n");
112 return 0;
113 }
114
115 /*
116 * mount options
117 */
118 enum {
119 Opt_wsize,
120 Opt_rsize,
121 Opt_rasize,
122 Opt_caps_wanted_delay_min,
123 Opt_caps_wanted_delay_max,
124 Opt_readdir_max_entries,
125 Opt_readdir_max_bytes,
126 Opt_congestion_kb,
127 Opt_last_int,
128 /* int args above */
129 Opt_snapdirname,
130 Opt_mds_namespace,
131 Opt_fscache_uniq,
132 Opt_last_string,
133 /* string args above */
134 Opt_dirstat,
135 Opt_nodirstat,
136 Opt_rbytes,
137 Opt_norbytes,
138 Opt_asyncreaddir,
139 Opt_noasyncreaddir,
140 Opt_dcache,
141 Opt_nodcache,
142 Opt_ino32,
143 Opt_noino32,
144 Opt_fscache,
145 Opt_nofscache,
146 Opt_poolperm,
147 Opt_nopoolperm,
148 Opt_require_active_mds,
149 Opt_norequire_active_mds,
150 #ifdef CONFIG_CEPH_FS_POSIX_ACL
151 Opt_acl,
152 #endif
153 Opt_noacl,
154 };
155
156 static match_table_t fsopt_tokens = {
157 {Opt_wsize, "wsize=%d"},
158 {Opt_rsize, "rsize=%d"},
159 {Opt_rasize, "rasize=%d"},
160 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
161 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
162 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
163 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
164 {Opt_congestion_kb, "write_congestion_kb=%d"},
165 /* int args above */
166 {Opt_snapdirname, "snapdirname=%s"},
167 {Opt_mds_namespace, "mds_namespace=%s"},
168 {Opt_fscache_uniq, "fsc=%s"},
169 /* string args above */
170 {Opt_dirstat, "dirstat"},
171 {Opt_nodirstat, "nodirstat"},
172 {Opt_rbytes, "rbytes"},
173 {Opt_norbytes, "norbytes"},
174 {Opt_asyncreaddir, "asyncreaddir"},
175 {Opt_noasyncreaddir, "noasyncreaddir"},
176 {Opt_dcache, "dcache"},
177 {Opt_nodcache, "nodcache"},
178 {Opt_ino32, "ino32"},
179 {Opt_noino32, "noino32"},
180 {Opt_fscache, "fsc"},
181 {Opt_nofscache, "nofsc"},
182 {Opt_poolperm, "poolperm"},
183 {Opt_nopoolperm, "nopoolperm"},
184 {Opt_require_active_mds, "require_active_mds"},
185 {Opt_norequire_active_mds, "norequire_active_mds"},
186 #ifdef CONFIG_CEPH_FS_POSIX_ACL
187 {Opt_acl, "acl"},
188 #endif
189 {Opt_noacl, "noacl"},
190 {-1, NULL}
191 };
192
193 static int parse_fsopt_token(char *c, void *private)
194 {
195 struct ceph_mount_options *fsopt = private;
196 substring_t argstr[MAX_OPT_ARGS];
197 int token, intval, ret;
198
199 token = match_token((char *)c, fsopt_tokens, argstr);
200 if (token < 0)
201 return -EINVAL;
202
203 if (token < Opt_last_int) {
204 ret = match_int(&argstr[0], &intval);
205 if (ret < 0) {
206 pr_err("bad mount option arg (not int) "
207 "at '%s'\n", c);
208 return ret;
209 }
210 dout("got int token %d val %d\n", token, intval);
211 } else if (token > Opt_last_int && token < Opt_last_string) {
212 dout("got string token %d val %s\n", token,
213 argstr[0].from);
214 } else {
215 dout("got token %d\n", token);
216 }
217
218 switch (token) {
219 case Opt_snapdirname:
220 kfree(fsopt->snapdir_name);
221 fsopt->snapdir_name = kstrndup(argstr[0].from,
222 argstr[0].to-argstr[0].from,
223 GFP_KERNEL);
224 if (!fsopt->snapdir_name)
225 return -ENOMEM;
226 break;
227 case Opt_mds_namespace:
228 fsopt->mds_namespace = kstrndup(argstr[0].from,
229 argstr[0].to-argstr[0].from,
230 GFP_KERNEL);
231 if (!fsopt->mds_namespace)
232 return -ENOMEM;
233 break;
234 case Opt_fscache_uniq:
235 fsopt->fscache_uniq = kstrndup(argstr[0].from,
236 argstr[0].to-argstr[0].from,
237 GFP_KERNEL);
238 if (!fsopt->fscache_uniq)
239 return -ENOMEM;
240 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
241 break;
242 /* misc */
243 case Opt_wsize:
244 if (intval < PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
245 return -EINVAL;
246 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
247 break;
248 case Opt_rsize:
249 if (intval < PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
250 return -EINVAL;
251 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
252 break;
253 case Opt_rasize:
254 if (intval < 0)
255 return -EINVAL;
256 fsopt->rasize = ALIGN(intval + PAGE_SIZE - 1, PAGE_SIZE);
257 break;
258 case Opt_caps_wanted_delay_min:
259 if (intval < 1)
260 return -EINVAL;
261 fsopt->caps_wanted_delay_min = intval;
262 break;
263 case Opt_caps_wanted_delay_max:
264 if (intval < 1)
265 return -EINVAL;
266 fsopt->caps_wanted_delay_max = intval;
267 break;
268 case Opt_readdir_max_entries:
269 if (intval < 1)
270 return -EINVAL;
271 fsopt->max_readdir = intval;
272 break;
273 case Opt_readdir_max_bytes:
274 if (intval < PAGE_SIZE && intval != 0)
275 return -EINVAL;
276 fsopt->max_readdir_bytes = intval;
277 break;
278 case Opt_congestion_kb:
279 if (intval < 1024) /* at least 1M */
280 return -EINVAL;
281 fsopt->congestion_kb = intval;
282 break;
283 case Opt_dirstat:
284 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
285 break;
286 case Opt_nodirstat:
287 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
288 break;
289 case Opt_rbytes:
290 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
291 break;
292 case Opt_norbytes:
293 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
294 break;
295 case Opt_asyncreaddir:
296 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
297 break;
298 case Opt_noasyncreaddir:
299 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
300 break;
301 case Opt_dcache:
302 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
303 break;
304 case Opt_nodcache:
305 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
306 break;
307 case Opt_ino32:
308 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
309 break;
310 case Opt_noino32:
311 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
312 break;
313 case Opt_fscache:
314 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
315 break;
316 case Opt_nofscache:
317 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
318 break;
319 case Opt_poolperm:
320 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
321 printk ("pool perm");
322 break;
323 case Opt_nopoolperm:
324 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
325 break;
326 case Opt_require_active_mds:
327 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
328 break;
329 case Opt_norequire_active_mds:
330 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
331 break;
332 #ifdef CONFIG_CEPH_FS_POSIX_ACL
333 case Opt_acl:
334 fsopt->sb_flags |= SB_POSIXACL;
335 break;
336 #endif
337 case Opt_noacl:
338 fsopt->sb_flags &= ~SB_POSIXACL;
339 break;
340 default:
341 BUG_ON(token);
342 }
343 return 0;
344 }
345
346 static void destroy_mount_options(struct ceph_mount_options *args)
347 {
348 dout("destroy_mount_options %p\n", args);
349 kfree(args->snapdir_name);
350 kfree(args->mds_namespace);
351 kfree(args->server_path);
352 kfree(args->fscache_uniq);
353 kfree(args);
354 }
355
356 static int strcmp_null(const char *s1, const char *s2)
357 {
358 if (!s1 && !s2)
359 return 0;
360 if (s1 && !s2)
361 return -1;
362 if (!s1 && s2)
363 return 1;
364 return strcmp(s1, s2);
365 }
366
367 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
368 struct ceph_options *new_opt,
369 struct ceph_fs_client *fsc)
370 {
371 struct ceph_mount_options *fsopt1 = new_fsopt;
372 struct ceph_mount_options *fsopt2 = fsc->mount_options;
373 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
374 int ret;
375
376 ret = memcmp(fsopt1, fsopt2, ofs);
377 if (ret)
378 return ret;
379
380 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
381 if (ret)
382 return ret;
383 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
384 if (ret)
385 return ret;
386 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
387 if (ret)
388 return ret;
389 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
390 if (ret)
391 return ret;
392
393 return ceph_compare_options(new_opt, fsc->client);
394 }
395
396 static int parse_mount_options(struct ceph_mount_options **pfsopt,
397 struct ceph_options **popt,
398 int flags, char *options,
399 const char *dev_name)
400 {
401 struct ceph_mount_options *fsopt;
402 const char *dev_name_end;
403 int err;
404
405 if (!dev_name || !*dev_name)
406 return -EINVAL;
407
408 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
409 if (!fsopt)
410 return -ENOMEM;
411
412 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
413
414 fsopt->sb_flags = flags;
415 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
416
417 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
418 fsopt->rsize = CEPH_MAX_READ_SIZE;
419 fsopt->rasize = CEPH_RASIZE_DEFAULT;
420 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
421 if (!fsopt->snapdir_name) {
422 err = -ENOMEM;
423 goto out;
424 }
425
426 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
427 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
428 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
429 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
430 fsopt->congestion_kb = default_congestion_kb();
431
432 /*
433 * Distinguish the server list from the path in "dev_name".
434 * Internally we do not include the leading '/' in the path.
435 *
436 * "dev_name" will look like:
437 * <server_spec>[,<server_spec>...]:[<path>]
438 * where
439 * <server_spec> is <ip>[:<port>]
440 * <path> is optional, but if present must begin with '/'
441 */
442 dev_name_end = strchr(dev_name, '/');
443 if (dev_name_end) {
444 if (strlen(dev_name_end) > 1) {
445 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
446 if (!fsopt->server_path) {
447 err = -ENOMEM;
448 goto out;
449 }
450 }
451 } else {
452 dev_name_end = dev_name + strlen(dev_name);
453 }
454 err = -EINVAL;
455 dev_name_end--; /* back up to ':' separator */
456 if (dev_name_end < dev_name || *dev_name_end != ':') {
457 pr_err("device name is missing path (no : separator in %s)\n",
458 dev_name);
459 goto out;
460 }
461 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
462 if (fsopt->server_path)
463 dout("server path '%s'\n", fsopt->server_path);
464
465 *popt = ceph_parse_options(options, dev_name, dev_name_end,
466 parse_fsopt_token, (void *)fsopt);
467 if (IS_ERR(*popt)) {
468 err = PTR_ERR(*popt);
469 goto out;
470 }
471
472 /* success */
473 *pfsopt = fsopt;
474 return 0;
475
476 out:
477 destroy_mount_options(fsopt);
478 return err;
479 }
480
481 /**
482 * ceph_show_options - Show mount options in /proc/mounts
483 * @m: seq_file to write to
484 * @root: root of that (sub)tree
485 */
486 static int ceph_show_options(struct seq_file *m, struct dentry *root)
487 {
488 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
489 struct ceph_mount_options *fsopt = fsc->mount_options;
490 size_t pos;
491 int ret;
492
493 /* a comma between MNT/MS and client options */
494 seq_putc(m, ',');
495 pos = m->count;
496
497 ret = ceph_print_client_options(m, fsc->client);
498 if (ret)
499 return ret;
500
501 /* retract our comma if no client options */
502 if (m->count == pos)
503 m->count--;
504
505 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
506 seq_puts(m, ",dirstat");
507 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
508 seq_puts(m, ",rbytes");
509 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
510 seq_puts(m, ",noasyncreaddir");
511 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
512 seq_puts(m, ",nodcache");
513 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
514 if (fsopt->fscache_uniq)
515 seq_printf(m, ",fsc=%s", fsopt->fscache_uniq);
516 else
517 seq_puts(m, ",fsc");
518 }
519 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
520 seq_puts(m, ",nopoolperm");
521
522 #ifdef CONFIG_CEPH_FS_POSIX_ACL
523 if (fsopt->sb_flags & SB_POSIXACL)
524 seq_puts(m, ",acl");
525 else
526 seq_puts(m, ",noacl");
527 #endif
528
529 if (fsopt->mds_namespace)
530 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
531 if (fsopt->wsize)
532 seq_printf(m, ",wsize=%d", fsopt->wsize);
533 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
534 seq_printf(m, ",rsize=%d", fsopt->rsize);
535 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
536 seq_printf(m, ",rasize=%d", fsopt->rasize);
537 if (fsopt->congestion_kb != default_congestion_kb())
538 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
539 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
540 seq_printf(m, ",caps_wanted_delay_min=%d",
541 fsopt->caps_wanted_delay_min);
542 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
543 seq_printf(m, ",caps_wanted_delay_max=%d",
544 fsopt->caps_wanted_delay_max);
545 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
546 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
547 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
548 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
549 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
550 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
551
552 return 0;
553 }
554
555 /*
556 * handle any mon messages the standard library doesn't understand.
557 * return error if we don't either.
558 */
559 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
560 {
561 struct ceph_fs_client *fsc = client->private;
562 int type = le16_to_cpu(msg->hdr.type);
563
564 switch (type) {
565 case CEPH_MSG_MDS_MAP:
566 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
567 return 0;
568 case CEPH_MSG_FS_MAP_USER:
569 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
570 return 0;
571 default:
572 return -1;
573 }
574 }
575
576 /*
577 * create a new fs client
578 */
579 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
580 struct ceph_options *opt)
581 {
582 struct ceph_fs_client *fsc;
583 int page_count;
584 size_t size;
585 int err = -ENOMEM;
586
587 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
588 if (!fsc)
589 return ERR_PTR(-ENOMEM);
590
591 fsc->client = ceph_create_client(opt, fsc);
592 if (IS_ERR(fsc->client)) {
593 err = PTR_ERR(fsc->client);
594 goto fail;
595 }
596 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
597
598 if (!fsopt->mds_namespace) {
599 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
600 0, true);
601 } else {
602 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
603 0, false);
604 }
605
606 fsc->mount_options = fsopt;
607
608 fsc->sb = NULL;
609 fsc->mount_state = CEPH_MOUNT_MOUNTING;
610
611 atomic_long_set(&fsc->writeback_count, 0);
612
613 err = -ENOMEM;
614 /*
615 * The number of concurrent works can be high but they don't need
616 * to be processed in parallel, limit concurrency.
617 */
618 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
619 if (!fsc->wb_wq)
620 goto fail_client;
621 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
622 if (!fsc->pg_inv_wq)
623 goto fail_wb_wq;
624 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
625 if (!fsc->trunc_wq)
626 goto fail_pg_inv_wq;
627
628 /* set up mempools */
629 err = -ENOMEM;
630 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
631 size = sizeof (struct page *) * (page_count ? page_count : 1);
632 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
633 if (!fsc->wb_pagevec_pool)
634 goto fail_trunc_wq;
635
636 /* caps */
637 fsc->min_caps = fsopt->max_readdir;
638
639 return fsc;
640
641 fail_trunc_wq:
642 destroy_workqueue(fsc->trunc_wq);
643 fail_pg_inv_wq:
644 destroy_workqueue(fsc->pg_inv_wq);
645 fail_wb_wq:
646 destroy_workqueue(fsc->wb_wq);
647 fail_client:
648 ceph_destroy_client(fsc->client);
649 fail:
650 kfree(fsc);
651 return ERR_PTR(err);
652 }
653
654 static void destroy_fs_client(struct ceph_fs_client *fsc)
655 {
656 dout("destroy_fs_client %p\n", fsc);
657
658 destroy_workqueue(fsc->wb_wq);
659 destroy_workqueue(fsc->pg_inv_wq);
660 destroy_workqueue(fsc->trunc_wq);
661
662 mempool_destroy(fsc->wb_pagevec_pool);
663
664 destroy_mount_options(fsc->mount_options);
665
666 ceph_destroy_client(fsc->client);
667
668 kfree(fsc);
669 dout("destroy_fs_client %p done\n", fsc);
670 }
671
672 /*
673 * caches
674 */
675 struct kmem_cache *ceph_inode_cachep;
676 struct kmem_cache *ceph_cap_cachep;
677 struct kmem_cache *ceph_cap_flush_cachep;
678 struct kmem_cache *ceph_dentry_cachep;
679 struct kmem_cache *ceph_file_cachep;
680
681 static void ceph_inode_init_once(void *foo)
682 {
683 struct ceph_inode_info *ci = foo;
684 inode_init_once(&ci->vfs_inode);
685 }
686
687 static int __init init_caches(void)
688 {
689 int error = -ENOMEM;
690
691 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
692 sizeof(struct ceph_inode_info),
693 __alignof__(struct ceph_inode_info),
694 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
695 SLAB_ACCOUNT, ceph_inode_init_once);
696 if (!ceph_inode_cachep)
697 return -ENOMEM;
698
699 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
700 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
701 if (!ceph_cap_cachep)
702 goto bad_cap;
703 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
704 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
705 if (!ceph_cap_flush_cachep)
706 goto bad_cap_flush;
707
708 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
709 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
710 if (!ceph_dentry_cachep)
711 goto bad_dentry;
712
713 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
714
715 if (!ceph_file_cachep)
716 goto bad_file;
717
718 if ((error = ceph_fscache_register()))
719 goto bad_file;
720
721 return 0;
722 bad_file:
723 kmem_cache_destroy(ceph_dentry_cachep);
724 bad_dentry:
725 kmem_cache_destroy(ceph_cap_flush_cachep);
726 bad_cap_flush:
727 kmem_cache_destroy(ceph_cap_cachep);
728 bad_cap:
729 kmem_cache_destroy(ceph_inode_cachep);
730 return error;
731 }
732
733 static void destroy_caches(void)
734 {
735 /*
736 * Make sure all delayed rcu free inodes are flushed before we
737 * destroy cache.
738 */
739 rcu_barrier();
740
741 kmem_cache_destroy(ceph_inode_cachep);
742 kmem_cache_destroy(ceph_cap_cachep);
743 kmem_cache_destroy(ceph_cap_flush_cachep);
744 kmem_cache_destroy(ceph_dentry_cachep);
745 kmem_cache_destroy(ceph_file_cachep);
746
747 ceph_fscache_unregister();
748 }
749
750
751 /*
752 * ceph_umount_begin - initiate forced umount. Tear down down the
753 * mount, skipping steps that may hang while waiting for server(s).
754 */
755 static void ceph_umount_begin(struct super_block *sb)
756 {
757 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
758
759 dout("ceph_umount_begin - starting forced umount\n");
760 if (!fsc)
761 return;
762 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
763 ceph_mdsc_force_umount(fsc->mdsc);
764 return;
765 }
766
767 static const struct super_operations ceph_super_ops = {
768 .alloc_inode = ceph_alloc_inode,
769 .destroy_inode = ceph_destroy_inode,
770 .write_inode = ceph_write_inode,
771 .drop_inode = ceph_drop_inode,
772 .sync_fs = ceph_sync_fs,
773 .put_super = ceph_put_super,
774 .show_options = ceph_show_options,
775 .statfs = ceph_statfs,
776 .umount_begin = ceph_umount_begin,
777 };
778
779 /*
780 * Bootstrap mount by opening the root directory. Note the mount
781 * @started time from caller, and time out if this takes too long.
782 */
783 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
784 const char *path,
785 unsigned long started)
786 {
787 struct ceph_mds_client *mdsc = fsc->mdsc;
788 struct ceph_mds_request *req = NULL;
789 int err;
790 struct dentry *root;
791
792 /* open dir */
793 dout("open_root_inode opening '%s'\n", path);
794 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
795 if (IS_ERR(req))
796 return ERR_CAST(req);
797 req->r_path1 = kstrdup(path, GFP_NOFS);
798 if (!req->r_path1) {
799 root = ERR_PTR(-ENOMEM);
800 goto out;
801 }
802
803 req->r_ino1.ino = CEPH_INO_ROOT;
804 req->r_ino1.snap = CEPH_NOSNAP;
805 req->r_started = started;
806 req->r_timeout = fsc->client->options->mount_timeout;
807 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
808 req->r_num_caps = 2;
809 err = ceph_mdsc_do_request(mdsc, NULL, req);
810 if (err == 0) {
811 struct inode *inode = req->r_target_inode;
812 req->r_target_inode = NULL;
813 dout("open_root_inode success\n");
814 root = d_make_root(inode);
815 if (!root) {
816 root = ERR_PTR(-ENOMEM);
817 goto out;
818 }
819 dout("open_root_inode success, root dentry is %p\n", root);
820 } else {
821 root = ERR_PTR(err);
822 }
823 out:
824 ceph_mdsc_put_request(req);
825 return root;
826 }
827
828
829
830
831 /*
832 * mount: join the ceph cluster, and open root directory.
833 */
834 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
835 {
836 int err;
837 unsigned long started = jiffies; /* note the start time */
838 struct dentry *root;
839 int first = 0; /* first vfsmount for this super_block */
840
841 dout("mount start %p\n", fsc);
842 mutex_lock(&fsc->client->mount_mutex);
843
844 if (!fsc->sb->s_root) {
845 const char *path;
846 err = __ceph_open_session(fsc->client, started);
847 if (err < 0)
848 goto out;
849
850 /* setup fscache */
851 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
852 err = ceph_fscache_register_fs(fsc);
853 if (err < 0)
854 goto out;
855 }
856
857 if (!fsc->mount_options->server_path) {
858 path = "";
859 dout("mount opening path \\t\n");
860 } else {
861 path = fsc->mount_options->server_path + 1;
862 dout("mount opening path %s\n", path);
863 }
864 root = open_root_dentry(fsc, path, started);
865 if (IS_ERR(root)) {
866 err = PTR_ERR(root);
867 goto out;
868 }
869 fsc->sb->s_root = dget(root);
870 first = 1;
871
872 err = ceph_fs_debugfs_init(fsc);
873 if (err < 0)
874 goto fail;
875 } else {
876 root = dget(fsc->sb->s_root);
877 }
878
879 fsc->mount_state = CEPH_MOUNT_MOUNTED;
880 dout("mount success\n");
881 mutex_unlock(&fsc->client->mount_mutex);
882 return root;
883
884 fail:
885 if (first) {
886 dput(fsc->sb->s_root);
887 fsc->sb->s_root = NULL;
888 }
889 out:
890 mutex_unlock(&fsc->client->mount_mutex);
891 return ERR_PTR(err);
892 }
893
894 static int ceph_set_super(struct super_block *s, void *data)
895 {
896 struct ceph_fs_client *fsc = data;
897 int ret;
898
899 dout("set_super %p data %p\n", s, data);
900
901 s->s_flags = fsc->mount_options->sb_flags;
902 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
903
904 s->s_xattr = ceph_xattr_handlers;
905 s->s_fs_info = fsc;
906 fsc->sb = s;
907
908 s->s_op = &ceph_super_ops;
909 s->s_d_op = &ceph_dentry_ops;
910 s->s_export_op = &ceph_export_ops;
911
912 s->s_time_gran = 1000; /* 1000 ns == 1 us */
913
914 ret = set_anon_super(s, NULL); /* what is that second arg for? */
915 if (ret != 0)
916 goto fail;
917
918 return ret;
919
920 fail:
921 s->s_fs_info = NULL;
922 fsc->sb = NULL;
923 return ret;
924 }
925
926 /*
927 * share superblock if same fs AND options
928 */
929 static int ceph_compare_super(struct super_block *sb, void *data)
930 {
931 struct ceph_fs_client *new = data;
932 struct ceph_mount_options *fsopt = new->mount_options;
933 struct ceph_options *opt = new->client->options;
934 struct ceph_fs_client *other = ceph_sb_to_client(sb);
935
936 dout("ceph_compare_super %p\n", sb);
937
938 if (compare_mount_options(fsopt, opt, other)) {
939 dout("monitor(s)/mount options don't match\n");
940 return 0;
941 }
942 if ((opt->flags & CEPH_OPT_FSID) &&
943 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
944 dout("fsid doesn't match\n");
945 return 0;
946 }
947 if (fsopt->sb_flags != other->mount_options->sb_flags) {
948 dout("flags differ\n");
949 return 0;
950 }
951 return 1;
952 }
953
954 /*
955 * construct our own bdi so we can control readahead, etc.
956 */
957 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
958
959 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
960 {
961 int err;
962
963 err = super_setup_bdi_name(sb, "ceph-%ld",
964 atomic_long_inc_return(&bdi_seq));
965 if (err)
966 return err;
967
968 /* set ra_pages based on rasize mount option? */
969 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
970
971 /* set io_pages based on max osd read size */
972 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
973
974 return 0;
975 }
976
977 static struct dentry *ceph_mount(struct file_system_type *fs_type,
978 int flags, const char *dev_name, void *data)
979 {
980 struct super_block *sb;
981 struct ceph_fs_client *fsc;
982 struct dentry *res;
983 int err;
984 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
985 struct ceph_mount_options *fsopt = NULL;
986 struct ceph_options *opt = NULL;
987
988 dout("ceph_mount\n");
989
990 #ifdef CONFIG_CEPH_FS_POSIX_ACL
991 flags |= SB_POSIXACL;
992 #endif
993 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
994 if (err < 0) {
995 res = ERR_PTR(err);
996 goto out_final;
997 }
998
999 /* create client (which we may/may not use) */
1000 fsc = create_fs_client(fsopt, opt);
1001 if (IS_ERR(fsc)) {
1002 res = ERR_CAST(fsc);
1003 destroy_mount_options(fsopt);
1004 ceph_destroy_options(opt);
1005 goto out_final;
1006 }
1007
1008 err = ceph_mdsc_init(fsc);
1009 if (err < 0) {
1010 res = ERR_PTR(err);
1011 goto out;
1012 }
1013
1014 if (ceph_test_opt(fsc->client, NOSHARE))
1015 compare_super = NULL;
1016 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1017 if (IS_ERR(sb)) {
1018 res = ERR_CAST(sb);
1019 goto out;
1020 }
1021
1022 if (ceph_sb_to_client(sb) != fsc) {
1023 ceph_mdsc_destroy(fsc);
1024 destroy_fs_client(fsc);
1025 fsc = ceph_sb_to_client(sb);
1026 dout("get_sb got existing client %p\n", fsc);
1027 } else {
1028 dout("get_sb using new client %p\n", fsc);
1029 err = ceph_setup_bdi(sb, fsc);
1030 if (err < 0) {
1031 res = ERR_PTR(err);
1032 goto out_splat;
1033 }
1034 }
1035
1036 res = ceph_real_mount(fsc);
1037 if (IS_ERR(res))
1038 goto out_splat;
1039 dout("root %p inode %p ino %llx.%llx\n", res,
1040 d_inode(res), ceph_vinop(d_inode(res)));
1041 return res;
1042
1043 out_splat:
1044 ceph_mdsc_close_sessions(fsc->mdsc);
1045 deactivate_locked_super(sb);
1046 goto out_final;
1047
1048 out:
1049 ceph_mdsc_destroy(fsc);
1050 destroy_fs_client(fsc);
1051 out_final:
1052 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1053 return res;
1054 }
1055
1056 static void ceph_kill_sb(struct super_block *s)
1057 {
1058 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1059 dev_t dev = s->s_dev;
1060
1061 dout("kill_sb %p\n", s);
1062
1063 ceph_mdsc_pre_umount(fsc->mdsc);
1064 generic_shutdown_super(s);
1065
1066 fsc->client->extra_mon_dispatch = NULL;
1067 ceph_fs_debugfs_cleanup(fsc);
1068
1069 ceph_fscache_unregister_fs(fsc);
1070
1071 ceph_mdsc_destroy(fsc);
1072
1073 destroy_fs_client(fsc);
1074 free_anon_bdev(dev);
1075 }
1076
1077 static struct file_system_type ceph_fs_type = {
1078 .owner = THIS_MODULE,
1079 .name = "ceph",
1080 .mount = ceph_mount,
1081 .kill_sb = ceph_kill_sb,
1082 .fs_flags = FS_RENAME_DOES_D_MOVE,
1083 };
1084 MODULE_ALIAS_FS("ceph");
1085
1086 static int __init init_ceph(void)
1087 {
1088 int ret = init_caches();
1089 if (ret)
1090 goto out;
1091
1092 ceph_flock_init();
1093 ceph_xattr_init();
1094 ret = register_filesystem(&ceph_fs_type);
1095 if (ret)
1096 goto out_xattr;
1097
1098 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1099
1100 return 0;
1101
1102 out_xattr:
1103 ceph_xattr_exit();
1104 destroy_caches();
1105 out:
1106 return ret;
1107 }
1108
1109 static void __exit exit_ceph(void)
1110 {
1111 dout("exit_ceph\n");
1112 unregister_filesystem(&ceph_fs_type);
1113 ceph_xattr_exit();
1114 destroy_caches();
1115 }
1116
1117 module_init(init_ceph);
1118 module_exit(exit_ceph);
1119
1120 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1121 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1122 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1123 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1124 MODULE_LICENSE("GPL");
Linux with added FPC-III support