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fs: remove mapping->backing_dev_info
[deliverable/linux.git] / fs / ceph / super.c
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 CEPH_FEATURE_MDS_INLINE_DATA;
520 const u64 required_features = 0;
521 int page_count;
522 size_t size;
523 int err = -ENOMEM;
524
525 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
526 if (!fsc)
527 return ERR_PTR(-ENOMEM);
528
529 fsc->client = ceph_create_client(opt, fsc, supported_features,
530 required_features);
531 if (IS_ERR(fsc->client)) {
532 err = PTR_ERR(fsc->client);
533 goto fail;
534 }
535 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
536 fsc->client->monc.want_mdsmap = 1;
537
538 fsc->mount_options = fsopt;
539
540 fsc->sb = NULL;
541 fsc->mount_state = CEPH_MOUNT_MOUNTING;
542
543 atomic_long_set(&fsc->writeback_count, 0);
544
545 err = bdi_init(&fsc->backing_dev_info);
546 if (err < 0)
547 goto fail_client;
548
549 err = -ENOMEM;
550 /*
551 * The number of concurrent works can be high but they don't need
552 * to be processed in parallel, limit concurrency.
553 */
554 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
555 if (fsc->wb_wq == NULL)
556 goto fail_bdi;
557 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
558 if (fsc->pg_inv_wq == NULL)
559 goto fail_wb_wq;
560 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
561 if (fsc->trunc_wq == NULL)
562 goto fail_pg_inv_wq;
563
564 /* set up mempools */
565 err = -ENOMEM;
566 page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT;
567 size = sizeof (struct page *) * (page_count ? page_count : 1);
568 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
569 if (!fsc->wb_pagevec_pool)
570 goto fail_trunc_wq;
571
572 /* setup fscache */
573 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
574 (ceph_fscache_register_fs(fsc) != 0))
575 goto fail_fscache;
576
577 /* caps */
578 fsc->min_caps = fsopt->max_readdir;
579
580 return fsc;
581
582 fail_fscache:
583 ceph_fscache_unregister_fs(fsc);
584 fail_trunc_wq:
585 destroy_workqueue(fsc->trunc_wq);
586 fail_pg_inv_wq:
587 destroy_workqueue(fsc->pg_inv_wq);
588 fail_wb_wq:
589 destroy_workqueue(fsc->wb_wq);
590 fail_bdi:
591 bdi_destroy(&fsc->backing_dev_info);
592 fail_client:
593 ceph_destroy_client(fsc->client);
594 fail:
595 kfree(fsc);
596 return ERR_PTR(err);
597 }
598
599 static void destroy_fs_client(struct ceph_fs_client *fsc)
600 {
601 dout("destroy_fs_client %p\n", fsc);
602
603 ceph_fscache_unregister_fs(fsc);
604
605 destroy_workqueue(fsc->wb_wq);
606 destroy_workqueue(fsc->pg_inv_wq);
607 destroy_workqueue(fsc->trunc_wq);
608
609 bdi_destroy(&fsc->backing_dev_info);
610
611 mempool_destroy(fsc->wb_pagevec_pool);
612
613 destroy_mount_options(fsc->mount_options);
614
615 ceph_fs_debugfs_cleanup(fsc);
616
617 ceph_destroy_client(fsc->client);
618
619 kfree(fsc);
620 dout("destroy_fs_client %p done\n", fsc);
621 }
622
623 /*
624 * caches
625 */
626 struct kmem_cache *ceph_inode_cachep;
627 struct kmem_cache *ceph_cap_cachep;
628 struct kmem_cache *ceph_dentry_cachep;
629 struct kmem_cache *ceph_file_cachep;
630
631 static void ceph_inode_init_once(void *foo)
632 {
633 struct ceph_inode_info *ci = foo;
634 inode_init_once(&ci->vfs_inode);
635 }
636
637 static int __init init_caches(void)
638 {
639 int error = -ENOMEM;
640
641 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
642 sizeof(struct ceph_inode_info),
643 __alignof__(struct ceph_inode_info),
644 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
645 ceph_inode_init_once);
646 if (ceph_inode_cachep == NULL)
647 return -ENOMEM;
648
649 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
650 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
651 if (ceph_cap_cachep == NULL)
652 goto bad_cap;
653
654 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
655 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
656 if (ceph_dentry_cachep == NULL)
657 goto bad_dentry;
658
659 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
660 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
661 if (ceph_file_cachep == NULL)
662 goto bad_file;
663
664 if ((error = ceph_fscache_register()))
665 goto bad_file;
666
667 return 0;
668 bad_file:
669 kmem_cache_destroy(ceph_dentry_cachep);
670 bad_dentry:
671 kmem_cache_destroy(ceph_cap_cachep);
672 bad_cap:
673 kmem_cache_destroy(ceph_inode_cachep);
674 return error;
675 }
676
677 static void destroy_caches(void)
678 {
679 /*
680 * Make sure all delayed rcu free inodes are flushed before we
681 * destroy cache.
682 */
683 rcu_barrier();
684
685 kmem_cache_destroy(ceph_inode_cachep);
686 kmem_cache_destroy(ceph_cap_cachep);
687 kmem_cache_destroy(ceph_dentry_cachep);
688 kmem_cache_destroy(ceph_file_cachep);
689
690 ceph_fscache_unregister();
691 }
692
693
694 /*
695 * ceph_umount_begin - initiate forced umount. Tear down down the
696 * mount, skipping steps that may hang while waiting for server(s).
697 */
698 static void ceph_umount_begin(struct super_block *sb)
699 {
700 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
701
702 dout("ceph_umount_begin - starting forced umount\n");
703 if (!fsc)
704 return;
705 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
706 return;
707 }
708
709 static const struct super_operations ceph_super_ops = {
710 .alloc_inode = ceph_alloc_inode,
711 .destroy_inode = ceph_destroy_inode,
712 .write_inode = ceph_write_inode,
713 .drop_inode = ceph_drop_inode,
714 .sync_fs = ceph_sync_fs,
715 .put_super = ceph_put_super,
716 .show_options = ceph_show_options,
717 .statfs = ceph_statfs,
718 .umount_begin = ceph_umount_begin,
719 };
720
721 /*
722 * Bootstrap mount by opening the root directory. Note the mount
723 * @started time from caller, and time out if this takes too long.
724 */
725 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
726 const char *path,
727 unsigned long started)
728 {
729 struct ceph_mds_client *mdsc = fsc->mdsc;
730 struct ceph_mds_request *req = NULL;
731 int err;
732 struct dentry *root;
733
734 /* open dir */
735 dout("open_root_inode opening '%s'\n", path);
736 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
737 if (IS_ERR(req))
738 return ERR_CAST(req);
739 req->r_path1 = kstrdup(path, GFP_NOFS);
740 req->r_ino1.ino = CEPH_INO_ROOT;
741 req->r_ino1.snap = CEPH_NOSNAP;
742 req->r_started = started;
743 req->r_timeout = fsc->client->options->mount_timeout * HZ;
744 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
745 req->r_num_caps = 2;
746 err = ceph_mdsc_do_request(mdsc, NULL, req);
747 if (err == 0) {
748 struct inode *inode = req->r_target_inode;
749 req->r_target_inode = NULL;
750 dout("open_root_inode success\n");
751 if (ceph_ino(inode) == CEPH_INO_ROOT &&
752 fsc->sb->s_root == NULL) {
753 root = d_make_root(inode);
754 if (!root) {
755 root = ERR_PTR(-ENOMEM);
756 goto out;
757 }
758 } else {
759 root = d_obtain_root(inode);
760 }
761 ceph_init_dentry(root);
762 dout("open_root_inode success, root dentry is %p\n", root);
763 } else {
764 root = ERR_PTR(err);
765 }
766 out:
767 ceph_mdsc_put_request(req);
768 return root;
769 }
770
771
772
773
774 /*
775 * mount: join the ceph cluster, and open root directory.
776 */
777 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
778 const char *path)
779 {
780 int err;
781 unsigned long started = jiffies; /* note the start time */
782 struct dentry *root;
783 int first = 0; /* first vfsmount for this super_block */
784
785 dout("mount start\n");
786 mutex_lock(&fsc->client->mount_mutex);
787
788 err = __ceph_open_session(fsc->client, started);
789 if (err < 0)
790 goto out;
791
792 dout("mount opening root\n");
793 root = open_root_dentry(fsc, "", started);
794 if (IS_ERR(root)) {
795 err = PTR_ERR(root);
796 goto out;
797 }
798 if (fsc->sb->s_root) {
799 dput(root);
800 } else {
801 fsc->sb->s_root = root;
802 first = 1;
803
804 err = ceph_fs_debugfs_init(fsc);
805 if (err < 0)
806 goto fail;
807 }
808
809 if (path[0] == 0) {
810 dget(root);
811 } else {
812 dout("mount opening base mountpoint\n");
813 root = open_root_dentry(fsc, path, started);
814 if (IS_ERR(root)) {
815 err = PTR_ERR(root);
816 goto fail;
817 }
818 }
819
820 fsc->mount_state = CEPH_MOUNT_MOUNTED;
821 dout("mount success\n");
822 mutex_unlock(&fsc->client->mount_mutex);
823 return root;
824
825 out:
826 mutex_unlock(&fsc->client->mount_mutex);
827 return ERR_PTR(err);
828
829 fail:
830 if (first) {
831 dput(fsc->sb->s_root);
832 fsc->sb->s_root = NULL;
833 }
834 goto out;
835 }
836
837 static int ceph_set_super(struct super_block *s, void *data)
838 {
839 struct ceph_fs_client *fsc = data;
840 int ret;
841
842 dout("set_super %p data %p\n", s, data);
843
844 s->s_flags = fsc->mount_options->sb_flags;
845 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
846
847 s->s_xattr = ceph_xattr_handlers;
848 s->s_fs_info = fsc;
849 fsc->sb = s;
850
851 s->s_op = &ceph_super_ops;
852 s->s_export_op = &ceph_export_ops;
853
854 s->s_time_gran = 1000; /* 1000 ns == 1 us */
855
856 ret = set_anon_super(s, NULL); /* what is that second arg for? */
857 if (ret != 0)
858 goto fail;
859
860 return ret;
861
862 fail:
863 s->s_fs_info = NULL;
864 fsc->sb = NULL;
865 return ret;
866 }
867
868 /*
869 * share superblock if same fs AND options
870 */
871 static int ceph_compare_super(struct super_block *sb, void *data)
872 {
873 struct ceph_fs_client *new = data;
874 struct ceph_mount_options *fsopt = new->mount_options;
875 struct ceph_options *opt = new->client->options;
876 struct ceph_fs_client *other = ceph_sb_to_client(sb);
877
878 dout("ceph_compare_super %p\n", sb);
879
880 if (compare_mount_options(fsopt, opt, other)) {
881 dout("monitor(s)/mount options don't match\n");
882 return 0;
883 }
884 if ((opt->flags & CEPH_OPT_FSID) &&
885 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
886 dout("fsid doesn't match\n");
887 return 0;
888 }
889 if (fsopt->sb_flags != other->mount_options->sb_flags) {
890 dout("flags differ\n");
891 return 0;
892 }
893 return 1;
894 }
895
896 /*
897 * construct our own bdi so we can control readahead, etc.
898 */
899 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
900
901 static int ceph_register_bdi(struct super_block *sb,
902 struct ceph_fs_client *fsc)
903 {
904 int err;
905
906 /* set ra_pages based on rasize mount option? */
907 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
908 fsc->backing_dev_info.ra_pages =
909 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
910 >> PAGE_SHIFT;
911 else
912 fsc->backing_dev_info.ra_pages =
913 default_backing_dev_info.ra_pages;
914
915 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
916 atomic_long_inc_return(&bdi_seq));
917 if (!err)
918 sb->s_bdi = &fsc->backing_dev_info;
919 return err;
920 }
921
922 static struct dentry *ceph_mount(struct file_system_type *fs_type,
923 int flags, const char *dev_name, void *data)
924 {
925 struct super_block *sb;
926 struct ceph_fs_client *fsc;
927 struct dentry *res;
928 int err;
929 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
930 const char *path = NULL;
931 struct ceph_mount_options *fsopt = NULL;
932 struct ceph_options *opt = NULL;
933
934 dout("ceph_mount\n");
935
936 #ifdef CONFIG_CEPH_FS_POSIX_ACL
937 flags |= MS_POSIXACL;
938 #endif
939 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
940 if (err < 0) {
941 res = ERR_PTR(err);
942 goto out_final;
943 }
944
945 /* create client (which we may/may not use) */
946 fsc = create_fs_client(fsopt, opt);
947 if (IS_ERR(fsc)) {
948 res = ERR_CAST(fsc);
949 destroy_mount_options(fsopt);
950 ceph_destroy_options(opt);
951 goto out_final;
952 }
953
954 err = ceph_mdsc_init(fsc);
955 if (err < 0) {
956 res = ERR_PTR(err);
957 goto out;
958 }
959
960 if (ceph_test_opt(fsc->client, NOSHARE))
961 compare_super = NULL;
962 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
963 if (IS_ERR(sb)) {
964 res = ERR_CAST(sb);
965 goto out;
966 }
967
968 if (ceph_sb_to_client(sb) != fsc) {
969 ceph_mdsc_destroy(fsc);
970 destroy_fs_client(fsc);
971 fsc = ceph_sb_to_client(sb);
972 dout("get_sb got existing client %p\n", fsc);
973 } else {
974 dout("get_sb using new client %p\n", fsc);
975 err = ceph_register_bdi(sb, fsc);
976 if (err < 0) {
977 res = ERR_PTR(err);
978 goto out_splat;
979 }
980 }
981
982 res = ceph_real_mount(fsc, path);
983 if (IS_ERR(res))
984 goto out_splat;
985 dout("root %p inode %p ino %llx.%llx\n", res,
986 res->d_inode, ceph_vinop(res->d_inode));
987 return res;
988
989 out_splat:
990 ceph_mdsc_close_sessions(fsc->mdsc);
991 deactivate_locked_super(sb);
992 goto out_final;
993
994 out:
995 ceph_mdsc_destroy(fsc);
996 destroy_fs_client(fsc);
997 out_final:
998 dout("ceph_mount fail %ld\n", PTR_ERR(res));
999 return res;
1000 }
1001
1002 static void ceph_kill_sb(struct super_block *s)
1003 {
1004 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1005 dout("kill_sb %p\n", s);
1006 ceph_mdsc_pre_umount(fsc->mdsc);
1007 kill_anon_super(s); /* will call put_super after sb is r/o */
1008 ceph_mdsc_destroy(fsc);
1009 destroy_fs_client(fsc);
1010 }
1011
1012 static struct file_system_type ceph_fs_type = {
1013 .owner = THIS_MODULE,
1014 .name = "ceph",
1015 .mount = ceph_mount,
1016 .kill_sb = ceph_kill_sb,
1017 .fs_flags = FS_RENAME_DOES_D_MOVE,
1018 };
1019 MODULE_ALIAS_FS("ceph");
1020
1021 static int __init init_ceph(void)
1022 {
1023 int ret = init_caches();
1024 if (ret)
1025 goto out;
1026
1027 ceph_flock_init();
1028 ceph_xattr_init();
1029 ret = ceph_snap_init();
1030 if (ret)
1031 goto out_xattr;
1032 ret = register_filesystem(&ceph_fs_type);
1033 if (ret)
1034 goto out_snap;
1035
1036 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1037
1038 return 0;
1039
1040 out_snap:
1041 ceph_snap_exit();
1042 out_xattr:
1043 ceph_xattr_exit();
1044 destroy_caches();
1045 out:
1046 return ret;
1047 }
1048
1049 static void __exit exit_ceph(void)
1050 {
1051 dout("exit_ceph\n");
1052 unregister_filesystem(&ceph_fs_type);
1053 ceph_snap_exit();
1054 ceph_xattr_exit();
1055 destroy_caches();
1056 }
1057
1058 module_init(init_ceph);
1059 module_exit(exit_ceph);
1060
1061 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1062 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1063 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1064 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1065 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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