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Linux 3.16-rc2
[linux/fpc-iii.git] / fs / ceph / super.c
blob06150fd745ac65d72c456b1fe57f537336f1064a
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 * ensure we release the bdi before put_anon_super releases
46 * the device name.
47 */
48 if (s->s_bdi == &fsc->backing_dev_info) {
49 bdi_unregister(&fsc->backing_dev_info);
50 s->s_bdi = NULL;
51 }
52
53 return;
54 }
55
56 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
57 {
58 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
59 struct ceph_monmap *monmap = fsc->client->monc.monmap;
60 struct ceph_statfs st;
61 u64 fsid;
62 int err;
63
64 dout("statfs\n");
65 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
66 if (err < 0)
67 return err;
68
69 /* fill in kstatfs */
70 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
71
72 /*
73 * express utilization in terms of large blocks to avoid
74 * overflow on 32-bit machines.
75 *
76 * NOTE: for the time being, we make bsize == frsize to humor
77 * not-yet-ancient versions of glibc that are broken.
78 * Someday, we will probably want to report a real block
79 * size... whatever that may mean for a network file system!
80 */
81 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
82 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
83 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
84 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
85 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
86
87 buf->f_files = le64_to_cpu(st.num_objects);
88 buf->f_ffree = -1;
89 buf->f_namelen = NAME_MAX;
90
91 /* leave fsid little-endian, regardless of host endianness */
92 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
93 buf->f_fsid.val[0] = fsid & 0xffffffff;
94 buf->f_fsid.val[1] = fsid >> 32;
95
96 return 0;
97 }
98
99
100 static int ceph_sync_fs(struct super_block *sb, int wait)
101 {
102 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
103
104 if (!wait) {
105 dout("sync_fs (non-blocking)\n");
106 ceph_flush_dirty_caps(fsc->mdsc);
107 dout("sync_fs (non-blocking) done\n");
108 return 0;
109 }
110
111 dout("sync_fs (blocking)\n");
112 ceph_osdc_sync(&fsc->client->osdc);
113 ceph_mdsc_sync(fsc->mdsc);
114 dout("sync_fs (blocking) done\n");
115 return 0;
116 }
117
118 /*
119 * mount options
120 */
121 enum {
122 Opt_wsize,
123 Opt_rsize,
124 Opt_rasize,
125 Opt_caps_wanted_delay_min,
126 Opt_caps_wanted_delay_max,
127 Opt_cap_release_safety,
128 Opt_readdir_max_entries,
129 Opt_readdir_max_bytes,
130 Opt_congestion_kb,
131 Opt_last_int,
132 /* int args above */
133 Opt_snapdirname,
134 Opt_last_string,
135 /* string args above */
136 Opt_dirstat,
137 Opt_nodirstat,
138 Opt_rbytes,
139 Opt_norbytes,
140 Opt_asyncreaddir,
141 Opt_noasyncreaddir,
142 Opt_dcache,
143 Opt_nodcache,
144 Opt_ino32,
145 Opt_noino32,
146 Opt_fscache,
147 Opt_nofscache,
148 #ifdef CONFIG_CEPH_FS_POSIX_ACL
149 Opt_acl,
150 #endif
151 Opt_noacl
152 };
153
154 static match_table_t fsopt_tokens = {
155 {Opt_wsize, "wsize=%d"},
156 {Opt_rsize, "rsize=%d"},
157 {Opt_rasize, "rasize=%d"},
158 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
159 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
160 {Opt_cap_release_safety, "cap_release_safety=%d"},
161 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
162 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
163 {Opt_congestion_kb, "write_congestion_kb=%d"},
164 /* int args above */
165 {Opt_snapdirname, "snapdirname=%s"},
166 /* string args above */
167 {Opt_dirstat, "dirstat"},
168 {Opt_nodirstat, "nodirstat"},
169 {Opt_rbytes, "rbytes"},
170 {Opt_norbytes, "norbytes"},
171 {Opt_asyncreaddir, "asyncreaddir"},
172 {Opt_noasyncreaddir, "noasyncreaddir"},
173 {Opt_dcache, "dcache"},
174 {Opt_nodcache, "nodcache"},
175 {Opt_ino32, "ino32"},
176 {Opt_noino32, "noino32"},
177 {Opt_fscache, "fsc"},
178 {Opt_nofscache, "nofsc"},
179 #ifdef CONFIG_CEPH_FS_POSIX_ACL
180 {Opt_acl, "acl"},
181 #endif
182 {Opt_noacl, "noacl"},
183 {-1, NULL}
184 };
185
186 static int parse_fsopt_token(char *c, void *private)
187 {
188 struct ceph_mount_options *fsopt = private;
189 substring_t argstr[MAX_OPT_ARGS];
190 int token, intval, ret;
191
192 token = match_token((char *)c, fsopt_tokens, argstr);
193 if (token < 0)
194 return -EINVAL;
195
196 if (token < Opt_last_int) {
197 ret = match_int(&argstr[0], &intval);
198 if (ret < 0) {
199 pr_err("bad mount option arg (not int) "
200 "at '%s'\n", c);
201 return ret;
202 }
203 dout("got int token %d val %d\n", token, intval);
204 } else if (token > Opt_last_int && token < Opt_last_string) {
205 dout("got string token %d val %s\n", token,
206 argstr[0].from);
207 } else {
208 dout("got token %d\n", token);
209 }
210
211 switch (token) {
212 case Opt_snapdirname:
213 kfree(fsopt->snapdir_name);
214 fsopt->snapdir_name = kstrndup(argstr[0].from,
215 argstr[0].to-argstr[0].from,
216 GFP_KERNEL);
217 if (!fsopt->snapdir_name)
218 return -ENOMEM;
219 break;
220
221 /* misc */
222 case Opt_wsize:
223 fsopt->wsize = intval;
224 break;
225 case Opt_rsize:
226 fsopt->rsize = intval;
227 break;
228 case Opt_rasize:
229 fsopt->rasize = intval;
230 break;
231 case Opt_caps_wanted_delay_min:
232 fsopt->caps_wanted_delay_min = intval;
233 break;
234 case Opt_caps_wanted_delay_max:
235 fsopt->caps_wanted_delay_max = intval;
236 break;
237 case Opt_readdir_max_entries:
238 fsopt->max_readdir = intval;
239 break;
240 case Opt_readdir_max_bytes:
241 fsopt->max_readdir_bytes = intval;
242 break;
243 case Opt_congestion_kb:
244 fsopt->congestion_kb = intval;
245 break;
246 case Opt_dirstat:
247 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
248 break;
249 case Opt_nodirstat:
250 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
251 break;
252 case Opt_rbytes:
253 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
254 break;
255 case Opt_norbytes:
256 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
257 break;
258 case Opt_asyncreaddir:
259 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
260 break;
261 case Opt_noasyncreaddir:
262 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
263 break;
264 case Opt_dcache:
265 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
266 break;
267 case Opt_nodcache:
268 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
269 break;
270 case Opt_ino32:
271 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
272 break;
273 case Opt_noino32:
274 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
275 break;
276 case Opt_fscache:
277 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
278 break;
279 case Opt_nofscache:
280 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
281 break;
282 #ifdef CONFIG_CEPH_FS_POSIX_ACL
283 case Opt_acl:
284 fsopt->sb_flags |= MS_POSIXACL;
285 break;
286 #endif
287 case Opt_noacl:
288 fsopt->sb_flags &= ~MS_POSIXACL;
289 break;
290 default:
291 BUG_ON(token);
292 }
293 return 0;
294 }
295
296 static void destroy_mount_options(struct ceph_mount_options *args)
297 {
298 dout("destroy_mount_options %p\n", args);
299 kfree(args->snapdir_name);
300 kfree(args);
301 }
302
303 static int strcmp_null(const char *s1, const char *s2)
304 {
305 if (!s1 && !s2)
306 return 0;
307 if (s1 && !s2)
308 return -1;
309 if (!s1 && s2)
310 return 1;
311 return strcmp(s1, s2);
312 }
313
314 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
315 struct ceph_options *new_opt,
316 struct ceph_fs_client *fsc)
317 {
318 struct ceph_mount_options *fsopt1 = new_fsopt;
319 struct ceph_mount_options *fsopt2 = fsc->mount_options;
320 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
321 int ret;
322
323 ret = memcmp(fsopt1, fsopt2, ofs);
324 if (ret)
325 return ret;
326
327 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
328 if (ret)
329 return ret;
330
331 return ceph_compare_options(new_opt, fsc->client);
332 }
333
334 static int parse_mount_options(struct ceph_mount_options **pfsopt,
335 struct ceph_options **popt,
336 int flags, char *options,
337 const char *dev_name,
338 const char **path)
339 {
340 struct ceph_mount_options *fsopt;
341 const char *dev_name_end;
342 int err;
343
344 if (!dev_name || !*dev_name)
345 return -EINVAL;
346
347 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
348 if (!fsopt)
349 return -ENOMEM;
350
351 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
352
353 fsopt->sb_flags = flags;
354 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
355
356 fsopt->rsize = CEPH_RSIZE_DEFAULT;
357 fsopt->rasize = CEPH_RASIZE_DEFAULT;
358 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
359 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
360 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
361 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
362 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
363 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
364 fsopt->congestion_kb = default_congestion_kb();
365
366 /*
367 * Distinguish the server list from the path in "dev_name".
368 * Internally we do not include the leading '/' in the path.
369 *
370 * "dev_name" will look like:
371 * <server_spec>[,<server_spec>...]:[<path>]
372 * where
373 * <server_spec> is <ip>[:<port>]
374 * <path> is optional, but if present must begin with '/'
375 */
376 dev_name_end = strchr(dev_name, '/');
377 if (dev_name_end) {
378 /* skip over leading '/' for path */
379 *path = dev_name_end + 1;
380 } else {
381 /* path is empty */
382 dev_name_end = dev_name + strlen(dev_name);
383 *path = dev_name_end;
384 }
385 err = -EINVAL;
386 dev_name_end--; /* back up to ':' separator */
387 if (dev_name_end < dev_name || *dev_name_end != ':') {
388 pr_err("device name is missing path (no : separator in %s)\n",
389 dev_name);
390 goto out;
391 }
392 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
393 dout("server path '%s'\n", *path);
394
395 *popt = ceph_parse_options(options, dev_name, dev_name_end,
396 parse_fsopt_token, (void *)fsopt);
397 if (IS_ERR(*popt)) {
398 err = PTR_ERR(*popt);
399 goto out;
400 }
401
402 /* success */
403 *pfsopt = fsopt;
404 return 0;
405
406 out:
407 destroy_mount_options(fsopt);
408 return err;
409 }
410
411 /**
412 * ceph_show_options - Show mount options in /proc/mounts
413 * @m: seq_file to write to
414 * @root: root of that (sub)tree
415 */
416 static int ceph_show_options(struct seq_file *m, struct dentry *root)
417 {
418 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
419 struct ceph_mount_options *fsopt = fsc->mount_options;
420 struct ceph_options *opt = fsc->client->options;
421
422 if (opt->flags & CEPH_OPT_FSID)
423 seq_printf(m, ",fsid=%pU", &opt->fsid);
424 if (opt->flags & CEPH_OPT_NOSHARE)
425 seq_puts(m, ",noshare");
426 if (opt->flags & CEPH_OPT_NOCRC)
427 seq_puts(m, ",nocrc");
428
429 if (opt->name)
430 seq_printf(m, ",name=%s", opt->name);
431 if (opt->key)
432 seq_puts(m, ",secret=<hidden>");
433
434 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
435 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
436 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
437 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
438 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
439 seq_printf(m, ",osdkeepalivetimeout=%d",
440 opt->osd_keepalive_timeout);
441
442 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
443 seq_puts(m, ",dirstat");
444 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
445 seq_puts(m, ",norbytes");
446 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
447 seq_puts(m, ",noasyncreaddir");
448 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
449 seq_puts(m, ",dcache");
450 else
451 seq_puts(m, ",nodcache");
452 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
453 seq_puts(m, ",fsc");
454 else
455 seq_puts(m, ",nofsc");
456
457 #ifdef CONFIG_CEPH_FS_POSIX_ACL
458 if (fsopt->sb_flags & MS_POSIXACL)
459 seq_puts(m, ",acl");
460 else
461 seq_puts(m, ",noacl");
462 #endif
463
464 if (fsopt->wsize)
465 seq_printf(m, ",wsize=%d", fsopt->wsize);
466 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
467 seq_printf(m, ",rsize=%d", fsopt->rsize);
468 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
469 seq_printf(m, ",rasize=%d", fsopt->rasize);
470 if (fsopt->congestion_kb != default_congestion_kb())
471 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
472 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
473 seq_printf(m, ",caps_wanted_delay_min=%d",
474 fsopt->caps_wanted_delay_min);
475 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
476 seq_printf(m, ",caps_wanted_delay_max=%d",
477 fsopt->caps_wanted_delay_max);
478 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
479 seq_printf(m, ",cap_release_safety=%d",
480 fsopt->cap_release_safety);
481 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
482 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
483 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
484 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
485 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
486 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
487 return 0;
488 }
489
490 /*
491 * handle any mon messages the standard library doesn't understand.
492 * return error if we don't either.
493 */
494 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
495 {
496 struct ceph_fs_client *fsc = client->private;
497 int type = le16_to_cpu(msg->hdr.type);
498
499 switch (type) {
500 case CEPH_MSG_MDS_MAP:
501 ceph_mdsc_handle_map(fsc->mdsc, msg);
502 return 0;
503
504 default:
505 return -1;
506 }
507 }
508
509 /*
510 * create a new fs client
511 */
512 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
513 struct ceph_options *opt)
514 {
515 struct ceph_fs_client *fsc;
516 const u64 supported_features =
517 CEPH_FEATURE_FLOCK |
518 CEPH_FEATURE_DIRLAYOUTHASH;
519 const u64 required_features = 0;
520 int page_count;
521 size_t size;
522 int err = -ENOMEM;
523
524 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
525 if (!fsc)
526 return ERR_PTR(-ENOMEM);
527
528 fsc->client = ceph_create_client(opt, fsc, supported_features,
529 required_features);
530 if (IS_ERR(fsc->client)) {
531 err = PTR_ERR(fsc->client);
532 goto fail;
533 }
534 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
535 fsc->client->monc.want_mdsmap = 1;
536
537 fsc->mount_options = fsopt;
538
539 fsc->sb = NULL;
540 fsc->mount_state = CEPH_MOUNT_MOUNTING;
541
542 atomic_long_set(&fsc->writeback_count, 0);
543
544 err = bdi_init(&fsc->backing_dev_info);
545 if (err < 0)
546 goto fail_client;
547
548 err = -ENOMEM;
549 /*
550 * The number of concurrent works can be high but they don't need
551 * to be processed in parallel, limit concurrency.
552 */
553 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
554 if (fsc->wb_wq == NULL)
555 goto fail_bdi;
556 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
557 if (fsc->pg_inv_wq == NULL)
558 goto fail_wb_wq;
559 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
560 if (fsc->trunc_wq == NULL)
561 goto fail_pg_inv_wq;
562
563 /* set up mempools */
564 err = -ENOMEM;
565 page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT;
566 size = sizeof (struct page *) * (page_count ? page_count : 1);
567 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
568 if (!fsc->wb_pagevec_pool)
569 goto fail_trunc_wq;
570
571 /* setup fscache */
572 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
573 (ceph_fscache_register_fs(fsc) != 0))
574 goto fail_fscache;
575
576 /* caps */
577 fsc->min_caps = fsopt->max_readdir;
578
579 return fsc;
580
581 fail_fscache:
582 ceph_fscache_unregister_fs(fsc);
583 fail_trunc_wq:
584 destroy_workqueue(fsc->trunc_wq);
585 fail_pg_inv_wq:
586 destroy_workqueue(fsc->pg_inv_wq);
587 fail_wb_wq:
588 destroy_workqueue(fsc->wb_wq);
589 fail_bdi:
590 bdi_destroy(&fsc->backing_dev_info);
591 fail_client:
592 ceph_destroy_client(fsc->client);
593 fail:
594 kfree(fsc);
595 return ERR_PTR(err);
596 }
597
598 static void destroy_fs_client(struct ceph_fs_client *fsc)
599 {
600 dout("destroy_fs_client %p\n", fsc);
601
602 ceph_fscache_unregister_fs(fsc);
603
604 destroy_workqueue(fsc->wb_wq);
605 destroy_workqueue(fsc->pg_inv_wq);
606 destroy_workqueue(fsc->trunc_wq);
607
608 bdi_destroy(&fsc->backing_dev_info);
609
610 mempool_destroy(fsc->wb_pagevec_pool);
611
612 destroy_mount_options(fsc->mount_options);
613
614 ceph_fs_debugfs_cleanup(fsc);
615
616 ceph_destroy_client(fsc->client);
617
618 kfree(fsc);
619 dout("destroy_fs_client %p done\n", fsc);
620 }
621
622 /*
623 * caches
624 */
625 struct kmem_cache *ceph_inode_cachep;
626 struct kmem_cache *ceph_cap_cachep;
627 struct kmem_cache *ceph_dentry_cachep;
628 struct kmem_cache *ceph_file_cachep;
629
630 static void ceph_inode_init_once(void *foo)
631 {
632 struct ceph_inode_info *ci = foo;
633 inode_init_once(&ci->vfs_inode);
634 }
635
636 static int __init init_caches(void)
637 {
638 int error = -ENOMEM;
639
640 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
641 sizeof(struct ceph_inode_info),
642 __alignof__(struct ceph_inode_info),
643 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
644 ceph_inode_init_once);
645 if (ceph_inode_cachep == NULL)
646 return -ENOMEM;
647
648 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
649 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
650 if (ceph_cap_cachep == NULL)
651 goto bad_cap;
652
653 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
654 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
655 if (ceph_dentry_cachep == NULL)
656 goto bad_dentry;
657
658 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
659 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
660 if (ceph_file_cachep == NULL)
661 goto bad_file;
662
663 if ((error = ceph_fscache_register()))
664 goto bad_file;
665
666 return 0;
667 bad_file:
668 kmem_cache_destroy(ceph_dentry_cachep);
669 bad_dentry:
670 kmem_cache_destroy(ceph_cap_cachep);
671 bad_cap:
672 kmem_cache_destroy(ceph_inode_cachep);
673 return error;
674 }
675
676 static void destroy_caches(void)
677 {
678 /*
679 * Make sure all delayed rcu free inodes are flushed before we
680 * destroy cache.
681 */
682 rcu_barrier();
683
684 kmem_cache_destroy(ceph_inode_cachep);
685 kmem_cache_destroy(ceph_cap_cachep);
686 kmem_cache_destroy(ceph_dentry_cachep);
687 kmem_cache_destroy(ceph_file_cachep);
688
689 ceph_fscache_unregister();
690 }
691
692
693 /*
694 * ceph_umount_begin - initiate forced umount. Tear down down the
695 * mount, skipping steps that may hang while waiting for server(s).
696 */
697 static void ceph_umount_begin(struct super_block *sb)
698 {
699 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
700
701 dout("ceph_umount_begin - starting forced umount\n");
702 if (!fsc)
703 return;
704 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
705 return;
706 }
707
708 static const struct super_operations ceph_super_ops = {
709 .alloc_inode = ceph_alloc_inode,
710 .destroy_inode = ceph_destroy_inode,
711 .write_inode = ceph_write_inode,
712 .drop_inode = ceph_drop_inode,
713 .sync_fs = ceph_sync_fs,
714 .put_super = ceph_put_super,
715 .show_options = ceph_show_options,
716 .statfs = ceph_statfs,
717 .umount_begin = ceph_umount_begin,
718 };
719
720 /*
721 * Bootstrap mount by opening the root directory. Note the mount
722 * @started time from caller, and time out if this takes too long.
723 */
724 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
725 const char *path,
726 unsigned long started)
727 {
728 struct ceph_mds_client *mdsc = fsc->mdsc;
729 struct ceph_mds_request *req = NULL;
730 int err;
731 struct dentry *root;
732
733 /* open dir */
734 dout("open_root_inode opening '%s'\n", path);
735 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
736 if (IS_ERR(req))
737 return ERR_CAST(req);
738 req->r_path1 = kstrdup(path, GFP_NOFS);
739 req->r_ino1.ino = CEPH_INO_ROOT;
740 req->r_ino1.snap = CEPH_NOSNAP;
741 req->r_started = started;
742 req->r_timeout = fsc->client->options->mount_timeout * HZ;
743 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
744 req->r_num_caps = 2;
745 err = ceph_mdsc_do_request(mdsc, NULL, req);
746 if (err == 0) {
747 struct inode *inode = req->r_target_inode;
748 req->r_target_inode = NULL;
749 dout("open_root_inode success\n");
750 if (ceph_ino(inode) == CEPH_INO_ROOT &&
751 fsc->sb->s_root == NULL) {
752 root = d_make_root(inode);
753 if (!root) {
754 root = ERR_PTR(-ENOMEM);
755 goto out;
756 }
757 } else {
758 root = d_obtain_alias(inode);
759 }
760 ceph_init_dentry(root);
761 dout("open_root_inode success, root dentry is %p\n", root);
762 } else {
763 root = ERR_PTR(err);
764 }
765 out:
766 ceph_mdsc_put_request(req);
767 return root;
768 }
769
770
771
772
773 /*
774 * mount: join the ceph cluster, and open root directory.
775 */
776 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
777 const char *path)
778 {
779 int err;
780 unsigned long started = jiffies; /* note the start time */
781 struct dentry *root;
782 int first = 0; /* first vfsmount for this super_block */
783
784 dout("mount start\n");
785 mutex_lock(&fsc->client->mount_mutex);
786
787 err = __ceph_open_session(fsc->client, started);
788 if (err < 0)
789 goto out;
790
791 dout("mount opening root\n");
792 root = open_root_dentry(fsc, "", started);
793 if (IS_ERR(root)) {
794 err = PTR_ERR(root);
795 goto out;
796 }
797 if (fsc->sb->s_root) {
798 dput(root);
799 } else {
800 fsc->sb->s_root = root;
801 first = 1;
802
803 err = ceph_fs_debugfs_init(fsc);
804 if (err < 0)
805 goto fail;
806 }
807
808 if (path[0] == 0) {
809 dget(root);
810 } else {
811 dout("mount opening base mountpoint\n");
812 root = open_root_dentry(fsc, path, started);
813 if (IS_ERR(root)) {
814 err = PTR_ERR(root);
815 goto fail;
816 }
817 }
818
819 fsc->mount_state = CEPH_MOUNT_MOUNTED;
820 dout("mount success\n");
821 mutex_unlock(&fsc->client->mount_mutex);
822 return root;
823
824 out:
825 mutex_unlock(&fsc->client->mount_mutex);
826 return ERR_PTR(err);
827
828 fail:
829 if (first) {
830 dput(fsc->sb->s_root);
831 fsc->sb->s_root = NULL;
832 }
833 goto out;
834 }
835
836 static int ceph_set_super(struct super_block *s, void *data)
837 {
838 struct ceph_fs_client *fsc = data;
839 int ret;
840
841 dout("set_super %p data %p\n", s, data);
842
843 s->s_flags = fsc->mount_options->sb_flags;
844 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
845
846 s->s_xattr = ceph_xattr_handlers;
847 s->s_fs_info = fsc;
848 fsc->sb = s;
849
850 s->s_op = &ceph_super_ops;
851 s->s_export_op = &ceph_export_ops;
852
853 s->s_time_gran = 1000; /* 1000 ns == 1 us */
854
855 ret = set_anon_super(s, NULL); /* what is that second arg for? */
856 if (ret != 0)
857 goto fail;
858
859 return ret;
860
861 fail:
862 s->s_fs_info = NULL;
863 fsc->sb = NULL;
864 return ret;
865 }
866
867 /*
868 * share superblock if same fs AND options
869 */
870 static int ceph_compare_super(struct super_block *sb, void *data)
871 {
872 struct ceph_fs_client *new = data;
873 struct ceph_mount_options *fsopt = new->mount_options;
874 struct ceph_options *opt = new->client->options;
875 struct ceph_fs_client *other = ceph_sb_to_client(sb);
876
877 dout("ceph_compare_super %p\n", sb);
878
879 if (compare_mount_options(fsopt, opt, other)) {
880 dout("monitor(s)/mount options don't match\n");
881 return 0;
882 }
883 if ((opt->flags & CEPH_OPT_FSID) &&
884 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
885 dout("fsid doesn't match\n");
886 return 0;
887 }
888 if (fsopt->sb_flags != other->mount_options->sb_flags) {
889 dout("flags differ\n");
890 return 0;
891 }
892 return 1;
893 }
894
895 /*
896 * construct our own bdi so we can control readahead, etc.
897 */
898 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
899
900 static int ceph_register_bdi(struct super_block *sb,
901 struct ceph_fs_client *fsc)
902 {
903 int err;
904
905 /* set ra_pages based on rasize mount option? */
906 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
907 fsc->backing_dev_info.ra_pages =
908 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
909 >> PAGE_SHIFT;
910 else
911 fsc->backing_dev_info.ra_pages =
912 default_backing_dev_info.ra_pages;
913
914 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
915 atomic_long_inc_return(&bdi_seq));
916 if (!err)
917 sb->s_bdi = &fsc->backing_dev_info;
918 return err;
919 }
920
921 static struct dentry *ceph_mount(struct file_system_type *fs_type,
922 int flags, const char *dev_name, void *data)
923 {
924 struct super_block *sb;
925 struct ceph_fs_client *fsc;
926 struct dentry *res;
927 int err;
928 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
929 const char *path = NULL;
930 struct ceph_mount_options *fsopt = NULL;
931 struct ceph_options *opt = NULL;
932
933 dout("ceph_mount\n");
934
935 #ifdef CONFIG_CEPH_FS_POSIX_ACL
936 flags |= MS_POSIXACL;
937 #endif
938 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
939 if (err < 0) {
940 res = ERR_PTR(err);
941 goto out_final;
942 }
943
944 /* create client (which we may/may not use) */
945 fsc = create_fs_client(fsopt, opt);
946 if (IS_ERR(fsc)) {
947 res = ERR_CAST(fsc);
948 destroy_mount_options(fsopt);
949 ceph_destroy_options(opt);
950 goto out_final;
951 }
952
953 err = ceph_mdsc_init(fsc);
954 if (err < 0) {
955 res = ERR_PTR(err);
956 goto out;
957 }
958
959 if (ceph_test_opt(fsc->client, NOSHARE))
960 compare_super = NULL;
961 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
962 if (IS_ERR(sb)) {
963 res = ERR_CAST(sb);
964 goto out;
965 }
966
967 if (ceph_sb_to_client(sb) != fsc) {
968 ceph_mdsc_destroy(fsc);
969 destroy_fs_client(fsc);
970 fsc = ceph_sb_to_client(sb);
971 dout("get_sb got existing client %p\n", fsc);
972 } else {
973 dout("get_sb using new client %p\n", fsc);
974 err = ceph_register_bdi(sb, fsc);
975 if (err < 0) {
976 res = ERR_PTR(err);
977 goto out_splat;
978 }
979 }
980
981 res = ceph_real_mount(fsc, path);
982 if (IS_ERR(res))
983 goto out_splat;
984 dout("root %p inode %p ino %llx.%llx\n", res,
985 res->d_inode, ceph_vinop(res->d_inode));
986 return res;
987
988 out_splat:
989 ceph_mdsc_close_sessions(fsc->mdsc);
990 deactivate_locked_super(sb);
991 goto out_final;
992
993 out:
994 ceph_mdsc_destroy(fsc);
995 destroy_fs_client(fsc);
996 out_final:
997 dout("ceph_mount fail %ld\n", PTR_ERR(res));
998 return res;
999 }
1000
1001 static void ceph_kill_sb(struct super_block *s)
1002 {
1003 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1004 dout("kill_sb %p\n", s);
1005 ceph_mdsc_pre_umount(fsc->mdsc);
1006 kill_anon_super(s); /* will call put_super after sb is r/o */
1007 ceph_mdsc_destroy(fsc);
1008 destroy_fs_client(fsc);
1009 }
1010
1011 static struct file_system_type ceph_fs_type = {
1012 .owner = THIS_MODULE,
1013 .name = "ceph",
1014 .mount = ceph_mount,
1015 .kill_sb = ceph_kill_sb,
1016 .fs_flags = FS_RENAME_DOES_D_MOVE,
1017 };
1018 MODULE_ALIAS_FS("ceph");
1019
1020 #define _STRINGIFY(x) #x
1021 #define STRINGIFY(x) _STRINGIFY(x)
1022
1023 static int __init init_ceph(void)
1024 {
1025 int ret = init_caches();
1026 if (ret)
1027 goto out;
1028
1029 ceph_flock_init();
1030 ceph_xattr_init();
1031 ret = register_filesystem(&ceph_fs_type);
1032 if (ret)
1033 goto out_icache;
1034
1035 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1036
1037 return 0;
1038
1039 out_icache:
1040 ceph_xattr_exit();
1041 destroy_caches();
1042 out:
1043 return ret;
1044 }
1045
1046 static void __exit exit_ceph(void)
1047 {
1048 dout("exit_ceph\n");
1049 unregister_filesystem(&ceph_fs_type);
1050 ceph_xattr_exit();
1051 destroy_caches();
1052 }
1053
1054 module_init(init_ceph);
1055 module_exit(exit_ceph);
1056
1057 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1058 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1059 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1060 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1061 MODULE_LICENSE("GPL");
Linux with added FPC-III support