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regulator: tps6524x: Use regulator_map_voltage_ascend
[linux-2.6/btrfs-unstable.git] / fs / ceph / super.c
blob6ddc0bca56b2e61abda40b5ad8194be95f73c152
1
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/backing-dev.h>
5 #include <linux/ctype.h>
6 #include <linux/fs.h>
7 #include <linux/inet.h>
8 #include <linux/in6.h>
9 #include <linux/module.h>
10 #include <linux/mount.h>
11 #include <linux/parser.h>
12 #include <linux/sched.h>
13 #include <linux/seq_file.h>
14 #include <linux/slab.h>
15 #include <linux/statfs.h>
16 #include <linux/string.h>
17
18 #include "super.h"
19 #include "mds_client.h"
20
21 #include <linux/ceph/ceph_features.h>
22 #include <linux/ceph/decode.h>
23 #include <linux/ceph/mon_client.h>
24 #include <linux/ceph/auth.h>
25 #include <linux/ceph/debugfs.h>
26
27 /*
28 * Ceph superblock operations
29 *
30 * Handle the basics of mounting, unmounting.
31 */
32
33 /*
34 * super ops
35 */
36 static void ceph_put_super(struct super_block *s)
37 {
38 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
39
40 dout("put_super\n");
41 ceph_mdsc_close_sessions(fsc->mdsc);
42
43 /*
44 * ensure we release the bdi before put_anon_super releases
45 * the device name.
46 */
47 if (s->s_bdi == &fsc->backing_dev_info) {
48 bdi_unregister(&fsc->backing_dev_info);
49 s->s_bdi = NULL;
50 }
51
52 return;
53 }
54
55 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
56 {
57 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
58 struct ceph_monmap *monmap = fsc->client->monc.monmap;
59 struct ceph_statfs st;
60 u64 fsid;
61 int err;
62
63 dout("statfs\n");
64 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
65 if (err < 0)
66 return err;
67
68 /* fill in kstatfs */
69 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
70
71 /*
72 * express utilization in terms of large blocks to avoid
73 * overflow on 32-bit machines.
74 *
75 * NOTE: for the time being, we make bsize == frsize to humor
76 * not-yet-ancient versions of glibc that are broken.
77 * Someday, we will probably want to report a real block
78 * size... whatever that may mean for a network file system!
79 */
80 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
81 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
82 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
83 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
84 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
85
86 buf->f_files = le64_to_cpu(st.num_objects);
87 buf->f_ffree = -1;
88 buf->f_namelen = NAME_MAX;
89
90 /* leave fsid little-endian, regardless of host endianness */
91 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
92 buf->f_fsid.val[0] = fsid & 0xffffffff;
93 buf->f_fsid.val[1] = fsid >> 32;
94
95 return 0;
96 }
97
98
99 static int ceph_sync_fs(struct super_block *sb, int wait)
100 {
101 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
102
103 if (!wait) {
104 dout("sync_fs (non-blocking)\n");
105 ceph_flush_dirty_caps(fsc->mdsc);
106 dout("sync_fs (non-blocking) done\n");
107 return 0;
108 }
109
110 dout("sync_fs (blocking)\n");
111 ceph_osdc_sync(&fsc->client->osdc);
112 ceph_mdsc_sync(fsc->mdsc);
113 dout("sync_fs (blocking) done\n");
114 return 0;
115 }
116
117 /*
118 * mount options
119 */
120 enum {
121 Opt_wsize,
122 Opt_rsize,
123 Opt_rasize,
124 Opt_caps_wanted_delay_min,
125 Opt_caps_wanted_delay_max,
126 Opt_cap_release_safety,
127 Opt_readdir_max_entries,
128 Opt_readdir_max_bytes,
129 Opt_congestion_kb,
130 Opt_last_int,
131 /* int args above */
132 Opt_snapdirname,
133 Opt_last_string,
134 /* string args above */
135 Opt_dirstat,
136 Opt_nodirstat,
137 Opt_rbytes,
138 Opt_norbytes,
139 Opt_asyncreaddir,
140 Opt_noasyncreaddir,
141 Opt_dcache,
142 Opt_nodcache,
143 Opt_ino32,
144 Opt_noino32,
145 };
146
147 static match_table_t fsopt_tokens = {
148 {Opt_wsize, "wsize=%d"},
149 {Opt_rsize, "rsize=%d"},
150 {Opt_rasize, "rasize=%d"},
151 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
152 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
153 {Opt_cap_release_safety, "cap_release_safety=%d"},
154 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
155 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
156 {Opt_congestion_kb, "write_congestion_kb=%d"},
157 /* int args above */
158 {Opt_snapdirname, "snapdirname=%s"},
159 /* string args above */
160 {Opt_dirstat, "dirstat"},
161 {Opt_nodirstat, "nodirstat"},
162 {Opt_rbytes, "rbytes"},
163 {Opt_norbytes, "norbytes"},
164 {Opt_asyncreaddir, "asyncreaddir"},
165 {Opt_noasyncreaddir, "noasyncreaddir"},
166 {Opt_dcache, "dcache"},
167 {Opt_nodcache, "nodcache"},
168 {Opt_ino32, "ino32"},
169 {Opt_noino32, "noino32"},
170 {-1, NULL}
171 };
172
173 static int parse_fsopt_token(char *c, void *private)
174 {
175 struct ceph_mount_options *fsopt = private;
176 substring_t argstr[MAX_OPT_ARGS];
177 int token, intval, ret;
178
179 token = match_token((char *)c, fsopt_tokens, argstr);
180 if (token < 0)
181 return -EINVAL;
182
183 if (token < Opt_last_int) {
184 ret = match_int(&argstr[0], &intval);
185 if (ret < 0) {
186 pr_err("bad mount option arg (not int) "
187 "at '%s'\n", c);
188 return ret;
189 }
190 dout("got int token %d val %d\n", token, intval);
191 } else if (token > Opt_last_int && token < Opt_last_string) {
192 dout("got string token %d val %s\n", token,
193 argstr[0].from);
194 } else {
195 dout("got token %d\n", token);
196 }
197
198 switch (token) {
199 case Opt_snapdirname:
200 kfree(fsopt->snapdir_name);
201 fsopt->snapdir_name = kstrndup(argstr[0].from,
202 argstr[0].to-argstr[0].from,
203 GFP_KERNEL);
204 if (!fsopt->snapdir_name)
205 return -ENOMEM;
206 break;
207
208 /* misc */
209 case Opt_wsize:
210 fsopt->wsize = intval;
211 break;
212 case Opt_rsize:
213 fsopt->rsize = intval;
214 break;
215 case Opt_rasize:
216 fsopt->rasize = intval;
217 break;
218 case Opt_caps_wanted_delay_min:
219 fsopt->caps_wanted_delay_min = intval;
220 break;
221 case Opt_caps_wanted_delay_max:
222 fsopt->caps_wanted_delay_max = intval;
223 break;
224 case Opt_readdir_max_entries:
225 fsopt->max_readdir = intval;
226 break;
227 case Opt_readdir_max_bytes:
228 fsopt->max_readdir_bytes = intval;
229 break;
230 case Opt_congestion_kb:
231 fsopt->congestion_kb = intval;
232 break;
233 case Opt_dirstat:
234 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
235 break;
236 case Opt_nodirstat:
237 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
238 break;
239 case Opt_rbytes:
240 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
241 break;
242 case Opt_norbytes:
243 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
244 break;
245 case Opt_asyncreaddir:
246 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
247 break;
248 case Opt_noasyncreaddir:
249 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
250 break;
251 case Opt_dcache:
252 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
253 break;
254 case Opt_nodcache:
255 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
256 break;
257 case Opt_ino32:
258 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
259 break;
260 case Opt_noino32:
261 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
262 break;
263 default:
264 BUG_ON(token);
265 }
266 return 0;
267 }
268
269 static void destroy_mount_options(struct ceph_mount_options *args)
270 {
271 dout("destroy_mount_options %p\n", args);
272 kfree(args->snapdir_name);
273 kfree(args);
274 }
275
276 static int strcmp_null(const char *s1, const char *s2)
277 {
278 if (!s1 && !s2)
279 return 0;
280 if (s1 && !s2)
281 return -1;
282 if (!s1 && s2)
283 return 1;
284 return strcmp(s1, s2);
285 }
286
287 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
288 struct ceph_options *new_opt,
289 struct ceph_fs_client *fsc)
290 {
291 struct ceph_mount_options *fsopt1 = new_fsopt;
292 struct ceph_mount_options *fsopt2 = fsc->mount_options;
293 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
294 int ret;
295
296 ret = memcmp(fsopt1, fsopt2, ofs);
297 if (ret)
298 return ret;
299
300 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
301 if (ret)
302 return ret;
303
304 return ceph_compare_options(new_opt, fsc->client);
305 }
306
307 static int parse_mount_options(struct ceph_mount_options **pfsopt,
308 struct ceph_options **popt,
309 int flags, char *options,
310 const char *dev_name,
311 const char **path)
312 {
313 struct ceph_mount_options *fsopt;
314 const char *dev_name_end;
315 int err;
316
317 if (!dev_name || !*dev_name)
318 return -EINVAL;
319
320 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
321 if (!fsopt)
322 return -ENOMEM;
323
324 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
325
326 fsopt->sb_flags = flags;
327 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
328
329 fsopt->rsize = CEPH_RSIZE_DEFAULT;
330 fsopt->rasize = CEPH_RASIZE_DEFAULT;
331 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
332 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
333 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
334 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
335 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
336 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
337 fsopt->congestion_kb = default_congestion_kb();
338
339 /*
340 * Distinguish the server list from the path in "dev_name".
341 * Internally we do not include the leading '/' in the path.
342 *
343 * "dev_name" will look like:
344 * <server_spec>[,<server_spec>...]:[<path>]
345 * where
346 * <server_spec> is <ip>[:<port>]
347 * <path> is optional, but if present must begin with '/'
348 */
349 dev_name_end = strchr(dev_name, '/');
350 if (dev_name_end) {
351 /* skip over leading '/' for path */
352 *path = dev_name_end + 1;
353 } else {
354 /* path is empty */
355 dev_name_end = dev_name + strlen(dev_name);
356 *path = dev_name_end;
357 }
358 err = -EINVAL;
359 dev_name_end--; /* back up to ':' separator */
360 if (*dev_name_end != ':') {
361 pr_err("device name is missing path (no : separator in %s)\n",
362 dev_name);
363 goto out;
364 }
365 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
366 dout("server path '%s'\n", *path);
367
368 *popt = ceph_parse_options(options, dev_name, dev_name_end,
369 parse_fsopt_token, (void *)fsopt);
370 if (IS_ERR(*popt)) {
371 err = PTR_ERR(*popt);
372 goto out;
373 }
374
375 /* success */
376 *pfsopt = fsopt;
377 return 0;
378
379 out:
380 destroy_mount_options(fsopt);
381 return err;
382 }
383
384 /**
385 * ceph_show_options - Show mount options in /proc/mounts
386 * @m: seq_file to write to
387 * @root: root of that (sub)tree
388 */
389 static int ceph_show_options(struct seq_file *m, struct dentry *root)
390 {
391 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
392 struct ceph_mount_options *fsopt = fsc->mount_options;
393 struct ceph_options *opt = fsc->client->options;
394
395 if (opt->flags & CEPH_OPT_FSID)
396 seq_printf(m, ",fsid=%pU", &opt->fsid);
397 if (opt->flags & CEPH_OPT_NOSHARE)
398 seq_puts(m, ",noshare");
399 if (opt->flags & CEPH_OPT_NOCRC)
400 seq_puts(m, ",nocrc");
401
402 if (opt->name)
403 seq_printf(m, ",name=%s", opt->name);
404 if (opt->key)
405 seq_puts(m, ",secret=<hidden>");
406
407 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
408 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
409 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
410 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
411 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
412 seq_printf(m, ",osdkeepalivetimeout=%d",
413 opt->osd_keepalive_timeout);
414
415 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
416 seq_puts(m, ",dirstat");
417 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
418 seq_puts(m, ",norbytes");
419 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
420 seq_puts(m, ",noasyncreaddir");
421 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
422 seq_puts(m, ",dcache");
423 else
424 seq_puts(m, ",nodcache");
425
426 if (fsopt->wsize)
427 seq_printf(m, ",wsize=%d", fsopt->wsize);
428 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
429 seq_printf(m, ",rsize=%d", fsopt->rsize);
430 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
431 seq_printf(m, ",rasize=%d", fsopt->rasize);
432 if (fsopt->congestion_kb != default_congestion_kb())
433 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
434 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
435 seq_printf(m, ",caps_wanted_delay_min=%d",
436 fsopt->caps_wanted_delay_min);
437 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
438 seq_printf(m, ",caps_wanted_delay_max=%d",
439 fsopt->caps_wanted_delay_max);
440 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
441 seq_printf(m, ",cap_release_safety=%d",
442 fsopt->cap_release_safety);
443 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
444 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
445 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
446 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
447 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
448 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
449 return 0;
450 }
451
452 /*
453 * handle any mon messages the standard library doesn't understand.
454 * return error if we don't either.
455 */
456 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
457 {
458 struct ceph_fs_client *fsc = client->private;
459 int type = le16_to_cpu(msg->hdr.type);
460
461 switch (type) {
462 case CEPH_MSG_MDS_MAP:
463 ceph_mdsc_handle_map(fsc->mdsc, msg);
464 return 0;
465
466 default:
467 return -1;
468 }
469 }
470
471 /*
472 * create a new fs client
473 */
474 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
475 struct ceph_options *opt)
476 {
477 struct ceph_fs_client *fsc;
478 const unsigned supported_features =
479 CEPH_FEATURE_FLOCK |
480 CEPH_FEATURE_DIRLAYOUTHASH;
481 const unsigned required_features = 0;
482 int err = -ENOMEM;
483
484 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
485 if (!fsc)
486 return ERR_PTR(-ENOMEM);
487
488 fsc->client = ceph_create_client(opt, fsc, supported_features,
489 required_features);
490 if (IS_ERR(fsc->client)) {
491 err = PTR_ERR(fsc->client);
492 goto fail;
493 }
494 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
495 fsc->client->monc.want_mdsmap = 1;
496
497 fsc->mount_options = fsopt;
498
499 fsc->sb = NULL;
500 fsc->mount_state = CEPH_MOUNT_MOUNTING;
501
502 atomic_long_set(&fsc->writeback_count, 0);
503
504 err = bdi_init(&fsc->backing_dev_info);
505 if (err < 0)
506 goto fail_client;
507
508 err = -ENOMEM;
509 /*
510 * The number of concurrent works can be high but they don't need
511 * to be processed in parallel, limit concurrency.
512 */
513 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
514 if (fsc->wb_wq == NULL)
515 goto fail_bdi;
516 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
517 if (fsc->pg_inv_wq == NULL)
518 goto fail_wb_wq;
519 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
520 if (fsc->trunc_wq == NULL)
521 goto fail_pg_inv_wq;
522
523 /* set up mempools */
524 err = -ENOMEM;
525 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
526 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
527 if (!fsc->wb_pagevec_pool)
528 goto fail_trunc_wq;
529
530 /* caps */
531 fsc->min_caps = fsopt->max_readdir;
532
533 return fsc;
534
535 fail_trunc_wq:
536 destroy_workqueue(fsc->trunc_wq);
537 fail_pg_inv_wq:
538 destroy_workqueue(fsc->pg_inv_wq);
539 fail_wb_wq:
540 destroy_workqueue(fsc->wb_wq);
541 fail_bdi:
542 bdi_destroy(&fsc->backing_dev_info);
543 fail_client:
544 ceph_destroy_client(fsc->client);
545 fail:
546 kfree(fsc);
547 return ERR_PTR(err);
548 }
549
550 static void destroy_fs_client(struct ceph_fs_client *fsc)
551 {
552 dout("destroy_fs_client %p\n", fsc);
553
554 destroy_workqueue(fsc->wb_wq);
555 destroy_workqueue(fsc->pg_inv_wq);
556 destroy_workqueue(fsc->trunc_wq);
557
558 bdi_destroy(&fsc->backing_dev_info);
559
560 mempool_destroy(fsc->wb_pagevec_pool);
561
562 destroy_mount_options(fsc->mount_options);
563
564 ceph_fs_debugfs_cleanup(fsc);
565
566 ceph_destroy_client(fsc->client);
567
568 kfree(fsc);
569 dout("destroy_fs_client %p done\n", fsc);
570 }
571
572 /*
573 * caches
574 */
575 struct kmem_cache *ceph_inode_cachep;
576 struct kmem_cache *ceph_cap_cachep;
577 struct kmem_cache *ceph_dentry_cachep;
578 struct kmem_cache *ceph_file_cachep;
579
580 static void ceph_inode_init_once(void *foo)
581 {
582 struct ceph_inode_info *ci = foo;
583 inode_init_once(&ci->vfs_inode);
584 }
585
586 static int __init init_caches(void)
587 {
588 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
589 sizeof(struct ceph_inode_info),
590 __alignof__(struct ceph_inode_info),
591 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
592 ceph_inode_init_once);
593 if (ceph_inode_cachep == NULL)
594 return -ENOMEM;
595
596 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
597 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
598 if (ceph_cap_cachep == NULL)
599 goto bad_cap;
600
601 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
602 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
603 if (ceph_dentry_cachep == NULL)
604 goto bad_dentry;
605
606 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
607 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
608 if (ceph_file_cachep == NULL)
609 goto bad_file;
610
611 return 0;
612
613 bad_file:
614 kmem_cache_destroy(ceph_dentry_cachep);
615 bad_dentry:
616 kmem_cache_destroy(ceph_cap_cachep);
617 bad_cap:
618 kmem_cache_destroy(ceph_inode_cachep);
619 return -ENOMEM;
620 }
621
622 static void destroy_caches(void)
623 {
624 /*
625 * Make sure all delayed rcu free inodes are flushed before we
626 * destroy cache.
627 */
628 rcu_barrier();
629 kmem_cache_destroy(ceph_inode_cachep);
630 kmem_cache_destroy(ceph_cap_cachep);
631 kmem_cache_destroy(ceph_dentry_cachep);
632 kmem_cache_destroy(ceph_file_cachep);
633 }
634
635
636 /*
637 * ceph_umount_begin - initiate forced umount. Tear down down the
638 * mount, skipping steps that may hang while waiting for server(s).
639 */
640 static void ceph_umount_begin(struct super_block *sb)
641 {
642 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
643
644 dout("ceph_umount_begin - starting forced umount\n");
645 if (!fsc)
646 return;
647 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
648 return;
649 }
650
651 static const struct super_operations ceph_super_ops = {
652 .alloc_inode = ceph_alloc_inode,
653 .destroy_inode = ceph_destroy_inode,
654 .write_inode = ceph_write_inode,
655 .sync_fs = ceph_sync_fs,
656 .put_super = ceph_put_super,
657 .show_options = ceph_show_options,
658 .statfs = ceph_statfs,
659 .umount_begin = ceph_umount_begin,
660 };
661
662 /*
663 * Bootstrap mount by opening the root directory. Note the mount
664 * @started time from caller, and time out if this takes too long.
665 */
666 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
667 const char *path,
668 unsigned long started)
669 {
670 struct ceph_mds_client *mdsc = fsc->mdsc;
671 struct ceph_mds_request *req = NULL;
672 int err;
673 struct dentry *root;
674
675 /* open dir */
676 dout("open_root_inode opening '%s'\n", path);
677 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
678 if (IS_ERR(req))
679 return ERR_CAST(req);
680 req->r_path1 = kstrdup(path, GFP_NOFS);
681 req->r_ino1.ino = CEPH_INO_ROOT;
682 req->r_ino1.snap = CEPH_NOSNAP;
683 req->r_started = started;
684 req->r_timeout = fsc->client->options->mount_timeout * HZ;
685 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
686 req->r_num_caps = 2;
687 err = ceph_mdsc_do_request(mdsc, NULL, req);
688 if (err == 0) {
689 struct inode *inode = req->r_target_inode;
690 req->r_target_inode = NULL;
691 dout("open_root_inode success\n");
692 if (ceph_ino(inode) == CEPH_INO_ROOT &&
693 fsc->sb->s_root == NULL) {
694 root = d_make_root(inode);
695 if (!root) {
696 root = ERR_PTR(-ENOMEM);
697 goto out;
698 }
699 } else {
700 root = d_obtain_alias(inode);
701 }
702 ceph_init_dentry(root);
703 dout("open_root_inode success, root dentry is %p\n", root);
704 } else {
705 root = ERR_PTR(err);
706 }
707 out:
708 ceph_mdsc_put_request(req);
709 return root;
710 }
711
712
713
714
715 /*
716 * mount: join the ceph cluster, and open root directory.
717 */
718 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
719 const char *path)
720 {
721 int err;
722 unsigned long started = jiffies; /* note the start time */
723 struct dentry *root;
724 int first = 0; /* first vfsmount for this super_block */
725
726 dout("mount start\n");
727 mutex_lock(&fsc->client->mount_mutex);
728
729 err = __ceph_open_session(fsc->client, started);
730 if (err < 0)
731 goto out;
732
733 dout("mount opening root\n");
734 root = open_root_dentry(fsc, "", started);
735 if (IS_ERR(root)) {
736 err = PTR_ERR(root);
737 goto out;
738 }
739 if (fsc->sb->s_root) {
740 dput(root);
741 } else {
742 fsc->sb->s_root = root;
743 first = 1;
744
745 err = ceph_fs_debugfs_init(fsc);
746 if (err < 0)
747 goto fail;
748 }
749
750 if (path[0] == 0) {
751 dget(root);
752 } else {
753 dout("mount opening base mountpoint\n");
754 root = open_root_dentry(fsc, path, started);
755 if (IS_ERR(root)) {
756 err = PTR_ERR(root);
757 goto fail;
758 }
759 }
760
761 fsc->mount_state = CEPH_MOUNT_MOUNTED;
762 dout("mount success\n");
763 mutex_unlock(&fsc->client->mount_mutex);
764 return root;
765
766 out:
767 mutex_unlock(&fsc->client->mount_mutex);
768 return ERR_PTR(err);
769
770 fail:
771 if (first) {
772 dput(fsc->sb->s_root);
773 fsc->sb->s_root = NULL;
774 }
775 goto out;
776 }
777
778 static int ceph_set_super(struct super_block *s, void *data)
779 {
780 struct ceph_fs_client *fsc = data;
781 int ret;
782
783 dout("set_super %p data %p\n", s, data);
784
785 s->s_flags = fsc->mount_options->sb_flags;
786 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
787
788 s->s_fs_info = fsc;
789 fsc->sb = s;
790
791 s->s_op = &ceph_super_ops;
792 s->s_export_op = &ceph_export_ops;
793
794 s->s_time_gran = 1000; /* 1000 ns == 1 us */
795
796 ret = set_anon_super(s, NULL); /* what is that second arg for? */
797 if (ret != 0)
798 goto fail;
799
800 return ret;
801
802 fail:
803 s->s_fs_info = NULL;
804 fsc->sb = NULL;
805 return ret;
806 }
807
808 /*
809 * share superblock if same fs AND options
810 */
811 static int ceph_compare_super(struct super_block *sb, void *data)
812 {
813 struct ceph_fs_client *new = data;
814 struct ceph_mount_options *fsopt = new->mount_options;
815 struct ceph_options *opt = new->client->options;
816 struct ceph_fs_client *other = ceph_sb_to_client(sb);
817
818 dout("ceph_compare_super %p\n", sb);
819
820 if (compare_mount_options(fsopt, opt, other)) {
821 dout("monitor(s)/mount options don't match\n");
822 return 0;
823 }
824 if ((opt->flags & CEPH_OPT_FSID) &&
825 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
826 dout("fsid doesn't match\n");
827 return 0;
828 }
829 if (fsopt->sb_flags != other->mount_options->sb_flags) {
830 dout("flags differ\n");
831 return 0;
832 }
833 return 1;
834 }
835
836 /*
837 * construct our own bdi so we can control readahead, etc.
838 */
839 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
840
841 static int ceph_register_bdi(struct super_block *sb,
842 struct ceph_fs_client *fsc)
843 {
844 int err;
845
846 /* set ra_pages based on rasize mount option? */
847 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
848 fsc->backing_dev_info.ra_pages =
849 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
850 >> PAGE_SHIFT;
851 else
852 fsc->backing_dev_info.ra_pages =
853 default_backing_dev_info.ra_pages;
854
855 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
856 atomic_long_inc_return(&bdi_seq));
857 if (!err)
858 sb->s_bdi = &fsc->backing_dev_info;
859 return err;
860 }
861
862 static struct dentry *ceph_mount(struct file_system_type *fs_type,
863 int flags, const char *dev_name, void *data)
864 {
865 struct super_block *sb;
866 struct ceph_fs_client *fsc;
867 struct dentry *res;
868 int err;
869 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
870 const char *path = NULL;
871 struct ceph_mount_options *fsopt = NULL;
872 struct ceph_options *opt = NULL;
873
874 dout("ceph_mount\n");
875 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
876 if (err < 0) {
877 res = ERR_PTR(err);
878 goto out_final;
879 }
880
881 /* create client (which we may/may not use) */
882 fsc = create_fs_client(fsopt, opt);
883 if (IS_ERR(fsc)) {
884 res = ERR_CAST(fsc);
885 destroy_mount_options(fsopt);
886 ceph_destroy_options(opt);
887 goto out_final;
888 }
889
890 err = ceph_mdsc_init(fsc);
891 if (err < 0) {
892 res = ERR_PTR(err);
893 goto out;
894 }
895
896 if (ceph_test_opt(fsc->client, NOSHARE))
897 compare_super = NULL;
898 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
899 if (IS_ERR(sb)) {
900 res = ERR_CAST(sb);
901 goto out;
902 }
903
904 if (ceph_sb_to_client(sb) != fsc) {
905 ceph_mdsc_destroy(fsc);
906 destroy_fs_client(fsc);
907 fsc = ceph_sb_to_client(sb);
908 dout("get_sb got existing client %p\n", fsc);
909 } else {
910 dout("get_sb using new client %p\n", fsc);
911 err = ceph_register_bdi(sb, fsc);
912 if (err < 0) {
913 res = ERR_PTR(err);
914 goto out_splat;
915 }
916 }
917
918 res = ceph_real_mount(fsc, path);
919 if (IS_ERR(res))
920 goto out_splat;
921 dout("root %p inode %p ino %llx.%llx\n", res,
922 res->d_inode, ceph_vinop(res->d_inode));
923 return res;
924
925 out_splat:
926 ceph_mdsc_close_sessions(fsc->mdsc);
927 deactivate_locked_super(sb);
928 goto out_final;
929
930 out:
931 ceph_mdsc_destroy(fsc);
932 destroy_fs_client(fsc);
933 out_final:
934 dout("ceph_mount fail %ld\n", PTR_ERR(res));
935 return res;
936 }
937
938 static void ceph_kill_sb(struct super_block *s)
939 {
940 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
941 dout("kill_sb %p\n", s);
942 ceph_mdsc_pre_umount(fsc->mdsc);
943 kill_anon_super(s); /* will call put_super after sb is r/o */
944 ceph_mdsc_destroy(fsc);
945 destroy_fs_client(fsc);
946 }
947
948 static struct file_system_type ceph_fs_type = {
949 .owner = THIS_MODULE,
950 .name = "ceph",
951 .mount = ceph_mount,
952 .kill_sb = ceph_kill_sb,
953 .fs_flags = FS_RENAME_DOES_D_MOVE,
954 };
955 MODULE_ALIAS_FS("ceph");
956
957 #define _STRINGIFY(x) #x
958 #define STRINGIFY(x) _STRINGIFY(x)
959
960 static int __init init_ceph(void)
961 {
962 int ret = init_caches();
963 if (ret)
964 goto out;
965
966 ceph_xattr_init();
967 ret = register_filesystem(&ceph_fs_type);
968 if (ret)
969 goto out_icache;
970
971 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
972
973 return 0;
974
975 out_icache:
976 ceph_xattr_exit();
977 destroy_caches();
978 out:
979 return ret;
980 }
981
982 static void __exit exit_ceph(void)
983 {
984 dout("exit_ceph\n");
985 unregister_filesystem(&ceph_fs_type);
986 ceph_xattr_exit();
987 destroy_caches();
988 }
989
990 module_init(init_ceph);
991 module_exit(exit_ceph);
992
993 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
994 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
995 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
996 MODULE_DESCRIPTION("Ceph filesystem for Linux");
997 MODULE_LICENSE("GPL");
(deprecated) Btrfs devel tree