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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / fs / ceph / super.c
blob0d47422e35481759b69c92d8f6e2769555d5a07e
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
53 dout("statfs\n");
54 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
55 if (err < 0)
56 return err;
57
58 /* fill in kstatfs */
59 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
60
61 /*
62 * express utilization in terms of large blocks to avoid
63 * overflow on 32-bit machines.
64 *
65 * NOTE: for the time being, we make bsize == frsize to humor
66 * not-yet-ancient versions of glibc that are broken.
67 * Someday, we will probably want to report a real block
68 * size... whatever that may mean for a network file system!
69 */
70 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
71 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
72 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
73 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
74 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
75
76 buf->f_files = le64_to_cpu(st.num_objects);
77 buf->f_ffree = -1;
78 buf->f_namelen = NAME_MAX;
79
80 /* leave fsid little-endian, regardless of host endianness */
81 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
82 buf->f_fsid.val[0] = fsid & 0xffffffff;
83 buf->f_fsid.val[1] = fsid >> 32;
84
85 return 0;
86 }
87
88
89 static int ceph_sync_fs(struct super_block *sb, int wait)
90 {
91 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
92
93 if (!wait) {
94 dout("sync_fs (non-blocking)\n");
95 ceph_flush_dirty_caps(fsc->mdsc);
96 dout("sync_fs (non-blocking) done\n");
97 return 0;
98 }
99
100 dout("sync_fs (blocking)\n");
101 ceph_osdc_sync(&fsc->client->osdc);
102 ceph_mdsc_sync(fsc->mdsc);
103 dout("sync_fs (blocking) done\n");
104 return 0;
105 }
106
107 /*
108 * mount options
109 */
110 enum {
111 Opt_wsize,
112 Opt_rsize,
113 Opt_rasize,
114 Opt_caps_wanted_delay_min,
115 Opt_caps_wanted_delay_max,
116 Opt_cap_release_safety,
117 Opt_readdir_max_entries,
118 Opt_readdir_max_bytes,
119 Opt_congestion_kb,
120 Opt_last_int,
121 /* int args above */
122 Opt_snapdirname,
123 Opt_last_string,
124 /* string args above */
125 Opt_dirstat,
126 Opt_nodirstat,
127 Opt_rbytes,
128 Opt_norbytes,
129 Opt_asyncreaddir,
130 Opt_noasyncreaddir,
131 Opt_dcache,
132 Opt_nodcache,
133 Opt_ino32,
134 Opt_noino32,
135 Opt_fscache,
136 Opt_nofscache,
137 #ifdef CONFIG_CEPH_FS_POSIX_ACL
138 Opt_acl,
139 #endif
140 Opt_noacl
141 };
142
143 static match_table_t fsopt_tokens = {
144 {Opt_wsize, "wsize=%d"},
145 {Opt_rsize, "rsize=%d"},
146 {Opt_rasize, "rasize=%d"},
147 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
148 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
149 {Opt_cap_release_safety, "cap_release_safety=%d"},
150 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
151 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
152 {Opt_congestion_kb, "write_congestion_kb=%d"},
153 /* int args above */
154 {Opt_snapdirname, "snapdirname=%s"},
155 /* string args above */
156 {Opt_dirstat, "dirstat"},
157 {Opt_nodirstat, "nodirstat"},
158 {Opt_rbytes, "rbytes"},
159 {Opt_norbytes, "norbytes"},
160 {Opt_asyncreaddir, "asyncreaddir"},
161 {Opt_noasyncreaddir, "noasyncreaddir"},
162 {Opt_dcache, "dcache"},
163 {Opt_nodcache, "nodcache"},
164 {Opt_ino32, "ino32"},
165 {Opt_noino32, "noino32"},
166 {Opt_fscache, "fsc"},
167 {Opt_nofscache, "nofsc"},
168 #ifdef CONFIG_CEPH_FS_POSIX_ACL
169 {Opt_acl, "acl"},
170 #endif
171 {Opt_noacl, "noacl"},
172 {-1, NULL}
173 };
174
175 static int parse_fsopt_token(char *c, void *private)
176 {
177 struct ceph_mount_options *fsopt = private;
178 substring_t argstr[MAX_OPT_ARGS];
179 int token, intval, ret;
180
181 token = match_token((char *)c, fsopt_tokens, argstr);
182 if (token < 0)
183 return -EINVAL;
184
185 if (token < Opt_last_int) {
186 ret = match_int(&argstr[0], &intval);
187 if (ret < 0) {
188 pr_err("bad mount option arg (not int) "
189 "at '%s'\n", c);
190 return ret;
191 }
192 dout("got int token %d val %d\n", token, intval);
193 } else if (token > Opt_last_int && token < Opt_last_string) {
194 dout("got string token %d val %s\n", token,
195 argstr[0].from);
196 } else {
197 dout("got token %d\n", token);
198 }
199
200 switch (token) {
201 case Opt_snapdirname:
202 kfree(fsopt->snapdir_name);
203 fsopt->snapdir_name = kstrndup(argstr[0].from,
204 argstr[0].to-argstr[0].from,
205 GFP_KERNEL);
206 if (!fsopt->snapdir_name)
207 return -ENOMEM;
208 break;
209
210 /* misc */
211 case Opt_wsize:
212 fsopt->wsize = intval;
213 break;
214 case Opt_rsize:
215 fsopt->rsize = intval;
216 break;
217 case Opt_rasize:
218 fsopt->rasize = intval;
219 break;
220 case Opt_caps_wanted_delay_min:
221 fsopt->caps_wanted_delay_min = intval;
222 break;
223 case Opt_caps_wanted_delay_max:
224 fsopt->caps_wanted_delay_max = intval;
225 break;
226 case Opt_readdir_max_entries:
227 fsopt->max_readdir = intval;
228 break;
229 case Opt_readdir_max_bytes:
230 fsopt->max_readdir_bytes = intval;
231 break;
232 case Opt_congestion_kb:
233 fsopt->congestion_kb = intval;
234 break;
235 case Opt_dirstat:
236 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
237 break;
238 case Opt_nodirstat:
239 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
240 break;
241 case Opt_rbytes:
242 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
243 break;
244 case Opt_norbytes:
245 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
246 break;
247 case Opt_asyncreaddir:
248 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
249 break;
250 case Opt_noasyncreaddir:
251 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
252 break;
253 case Opt_dcache:
254 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
255 break;
256 case Opt_nodcache:
257 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
258 break;
259 case Opt_ino32:
260 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
261 break;
262 case Opt_noino32:
263 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
264 break;
265 case Opt_fscache:
266 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
267 break;
268 case Opt_nofscache:
269 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
270 break;
271 #ifdef CONFIG_CEPH_FS_POSIX_ACL
272 case Opt_acl:
273 fsopt->sb_flags |= MS_POSIXACL;
274 break;
275 #endif
276 case Opt_noacl:
277 fsopt->sb_flags &= ~MS_POSIXACL;
278 break;
279 default:
280 BUG_ON(token);
281 }
282 return 0;
283 }
284
285 static void destroy_mount_options(struct ceph_mount_options *args)
286 {
287 dout("destroy_mount_options %p\n", args);
288 kfree(args->snapdir_name);
289 kfree(args);
290 }
291
292 static int strcmp_null(const char *s1, const char *s2)
293 {
294 if (!s1 && !s2)
295 return 0;
296 if (s1 && !s2)
297 return -1;
298 if (!s1 && s2)
299 return 1;
300 return strcmp(s1, s2);
301 }
302
303 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
304 struct ceph_options *new_opt,
305 struct ceph_fs_client *fsc)
306 {
307 struct ceph_mount_options *fsopt1 = new_fsopt;
308 struct ceph_mount_options *fsopt2 = fsc->mount_options;
309 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
310 int ret;
311
312 ret = memcmp(fsopt1, fsopt2, ofs);
313 if (ret)
314 return ret;
315
316 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
317 if (ret)
318 return ret;
319
320 return ceph_compare_options(new_opt, fsc->client);
321 }
322
323 static int parse_mount_options(struct ceph_mount_options **pfsopt,
324 struct ceph_options **popt,
325 int flags, char *options,
326 const char *dev_name,
327 const char **path)
328 {
329 struct ceph_mount_options *fsopt;
330 const char *dev_name_end;
331 int err;
332
333 if (!dev_name || !*dev_name)
334 return -EINVAL;
335
336 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
337 if (!fsopt)
338 return -ENOMEM;
339
340 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
341
342 fsopt->sb_flags = flags;
343 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
344
345 fsopt->rsize = CEPH_RSIZE_DEFAULT;
346 fsopt->rasize = CEPH_RASIZE_DEFAULT;
347 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
348 if (!fsopt->snapdir_name) {
349 err = -ENOMEM;
350 goto out;
351 }
352
353 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
354 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
355 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
356 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
357 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
358 fsopt->congestion_kb = default_congestion_kb();
359
360 /*
361 * Distinguish the server list from the path in "dev_name".
362 * Internally we do not include the leading '/' in the path.
363 *
364 * "dev_name" will look like:
365 * <server_spec>[,<server_spec>...]:[<path>]
366 * where
367 * <server_spec> is <ip>[:<port>]
368 * <path> is optional, but if present must begin with '/'
369 */
370 dev_name_end = strchr(dev_name, '/');
371 if (dev_name_end) {
372 /* skip over leading '/' for path */
373 *path = dev_name_end + 1;
374 } else {
375 /* path is empty */
376 dev_name_end = dev_name + strlen(dev_name);
377 *path = dev_name_end;
378 }
379 err = -EINVAL;
380 dev_name_end--; /* back up to ':' separator */
381 if (dev_name_end < dev_name || *dev_name_end != ':') {
382 pr_err("device name is missing path (no : separator in %s)\n",
383 dev_name);
384 goto out;
385 }
386 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
387 dout("server path '%s'\n", *path);
388
389 *popt = ceph_parse_options(options, dev_name, dev_name_end,
390 parse_fsopt_token, (void *)fsopt);
391 if (IS_ERR(*popt)) {
392 err = PTR_ERR(*popt);
393 goto out;
394 }
395
396 /* success */
397 *pfsopt = fsopt;
398 return 0;
399
400 out:
401 destroy_mount_options(fsopt);
402 return err;
403 }
404
405 /**
406 * ceph_show_options - Show mount options in /proc/mounts
407 * @m: seq_file to write to
408 * @root: root of that (sub)tree
409 */
410 static int ceph_show_options(struct seq_file *m, struct dentry *root)
411 {
412 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
413 struct ceph_mount_options *fsopt = fsc->mount_options;
414 size_t pos;
415 int ret;
416
417 /* a comma between MNT/MS and client options */
418 seq_putc(m, ',');
419 pos = m->count;
420
421 ret = ceph_print_client_options(m, fsc->client);
422 if (ret)
423 return ret;
424
425 /* retract our comma if no client options */
426 if (m->count == pos)
427 m->count--;
428
429 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
430 seq_puts(m, ",dirstat");
431 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
432 seq_puts(m, ",norbytes");
433 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
434 seq_puts(m, ",noasyncreaddir");
435 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
436 seq_puts(m, ",nodcache");
437 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
438 seq_puts(m, ",fsc");
439
440 #ifdef CONFIG_CEPH_FS_POSIX_ACL
441 if (fsopt->sb_flags & MS_POSIXACL)
442 seq_puts(m, ",acl");
443 else
444 seq_puts(m, ",noacl");
445 #endif
446
447 if (fsopt->wsize)
448 seq_printf(m, ",wsize=%d", fsopt->wsize);
449 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
450 seq_printf(m, ",rsize=%d", fsopt->rsize);
451 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
452 seq_printf(m, ",rasize=%d", fsopt->rasize);
453 if (fsopt->congestion_kb != default_congestion_kb())
454 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
455 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
456 seq_printf(m, ",caps_wanted_delay_min=%d",
457 fsopt->caps_wanted_delay_min);
458 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
459 seq_printf(m, ",caps_wanted_delay_max=%d",
460 fsopt->caps_wanted_delay_max);
461 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
462 seq_printf(m, ",cap_release_safety=%d",
463 fsopt->cap_release_safety);
464 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
465 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
466 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
467 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
468 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
469 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
470
471 return 0;
472 }
473
474 /*
475 * handle any mon messages the standard library doesn't understand.
476 * return error if we don't either.
477 */
478 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
479 {
480 struct ceph_fs_client *fsc = client->private;
481 int type = le16_to_cpu(msg->hdr.type);
482
483 switch (type) {
484 case CEPH_MSG_MDS_MAP:
485 ceph_mdsc_handle_map(fsc->mdsc, msg);
486 return 0;
487
488 default:
489 return -1;
490 }
491 }
492
493 /*
494 * create a new fs client
495 */
496 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
497 struct ceph_options *opt)
498 {
499 struct ceph_fs_client *fsc;
500 const u64 supported_features =
501 CEPH_FEATURE_FLOCK |
502 CEPH_FEATURE_DIRLAYOUTHASH |
503 CEPH_FEATURE_MDS_INLINE_DATA;
504 const u64 required_features = 0;
505 int page_count;
506 size_t size;
507 int err = -ENOMEM;
508
509 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
510 if (!fsc)
511 return ERR_PTR(-ENOMEM);
512
513 fsc->client = ceph_create_client(opt, fsc, supported_features,
514 required_features);
515 if (IS_ERR(fsc->client)) {
516 err = PTR_ERR(fsc->client);
517 goto fail;
518 }
519 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
520 fsc->client->monc.want_mdsmap = 1;
521
522 fsc->mount_options = fsopt;
523
524 fsc->sb = NULL;
525 fsc->mount_state = CEPH_MOUNT_MOUNTING;
526
527 atomic_long_set(&fsc->writeback_count, 0);
528
529 err = bdi_init(&fsc->backing_dev_info);
530 if (err < 0)
531 goto fail_client;
532
533 err = -ENOMEM;
534 /*
535 * The number of concurrent works can be high but they don't need
536 * to be processed in parallel, limit concurrency.
537 */
538 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
539 if (fsc->wb_wq == NULL)
540 goto fail_bdi;
541 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
542 if (fsc->pg_inv_wq == NULL)
543 goto fail_wb_wq;
544 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
545 if (fsc->trunc_wq == NULL)
546 goto fail_pg_inv_wq;
547
548 /* set up mempools */
549 err = -ENOMEM;
550 page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT;
551 size = sizeof (struct page *) * (page_count ? page_count : 1);
552 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
553 if (!fsc->wb_pagevec_pool)
554 goto fail_trunc_wq;
555
556 /* setup fscache */
557 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
558 (ceph_fscache_register_fs(fsc) != 0))
559 goto fail_fscache;
560
561 /* caps */
562 fsc->min_caps = fsopt->max_readdir;
563
564 return fsc;
565
566 fail_fscache:
567 ceph_fscache_unregister_fs(fsc);
568 fail_trunc_wq:
569 destroy_workqueue(fsc->trunc_wq);
570 fail_pg_inv_wq:
571 destroy_workqueue(fsc->pg_inv_wq);
572 fail_wb_wq:
573 destroy_workqueue(fsc->wb_wq);
574 fail_bdi:
575 bdi_destroy(&fsc->backing_dev_info);
576 fail_client:
577 ceph_destroy_client(fsc->client);
578 fail:
579 kfree(fsc);
580 return ERR_PTR(err);
581 }
582
583 static void destroy_fs_client(struct ceph_fs_client *fsc)
584 {
585 dout("destroy_fs_client %p\n", fsc);
586
587 ceph_fscache_unregister_fs(fsc);
588
589 destroy_workqueue(fsc->wb_wq);
590 destroy_workqueue(fsc->pg_inv_wq);
591 destroy_workqueue(fsc->trunc_wq);
592
593 bdi_destroy(&fsc->backing_dev_info);
594
595 mempool_destroy(fsc->wb_pagevec_pool);
596
597 destroy_mount_options(fsc->mount_options);
598
599 ceph_fs_debugfs_cleanup(fsc);
600
601 ceph_destroy_client(fsc->client);
602
603 kfree(fsc);
604 dout("destroy_fs_client %p done\n", fsc);
605 }
606
607 /*
608 * caches
609 */
610 struct kmem_cache *ceph_inode_cachep;
611 struct kmem_cache *ceph_cap_cachep;
612 struct kmem_cache *ceph_dentry_cachep;
613 struct kmem_cache *ceph_file_cachep;
614
615 static void ceph_inode_init_once(void *foo)
616 {
617 struct ceph_inode_info *ci = foo;
618 inode_init_once(&ci->vfs_inode);
619 }
620
621 static int __init init_caches(void)
622 {
623 int error = -ENOMEM;
624
625 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
626 sizeof(struct ceph_inode_info),
627 __alignof__(struct ceph_inode_info),
628 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
629 ceph_inode_init_once);
630 if (ceph_inode_cachep == NULL)
631 return -ENOMEM;
632
633 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
634 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
635 if (ceph_cap_cachep == NULL)
636 goto bad_cap;
637
638 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
639 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
640 if (ceph_dentry_cachep == NULL)
641 goto bad_dentry;
642
643 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
644 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
645 if (ceph_file_cachep == NULL)
646 goto bad_file;
647
648 if ((error = ceph_fscache_register()))
649 goto bad_file;
650
651 return 0;
652 bad_file:
653 kmem_cache_destroy(ceph_dentry_cachep);
654 bad_dentry:
655 kmem_cache_destroy(ceph_cap_cachep);
656 bad_cap:
657 kmem_cache_destroy(ceph_inode_cachep);
658 return error;
659 }
660
661 static void destroy_caches(void)
662 {
663 /*
664 * Make sure all delayed rcu free inodes are flushed before we
665 * destroy cache.
666 */
667 rcu_barrier();
668
669 kmem_cache_destroy(ceph_inode_cachep);
670 kmem_cache_destroy(ceph_cap_cachep);
671 kmem_cache_destroy(ceph_dentry_cachep);
672 kmem_cache_destroy(ceph_file_cachep);
673
674 ceph_fscache_unregister();
675 }
676
677
678 /*
679 * ceph_umount_begin - initiate forced umount. Tear down down the
680 * mount, skipping steps that may hang while waiting for server(s).
681 */
682 static void ceph_umount_begin(struct super_block *sb)
683 {
684 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
685
686 dout("ceph_umount_begin - starting forced umount\n");
687 if (!fsc)
688 return;
689 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
690 return;
691 }
692
693 static const struct super_operations ceph_super_ops = {
694 .alloc_inode = ceph_alloc_inode,
695 .destroy_inode = ceph_destroy_inode,
696 .write_inode = ceph_write_inode,
697 .drop_inode = ceph_drop_inode,
698 .sync_fs = ceph_sync_fs,
699 .put_super = ceph_put_super,
700 .show_options = ceph_show_options,
701 .statfs = ceph_statfs,
702 .umount_begin = ceph_umount_begin,
703 };
704
705 /*
706 * Bootstrap mount by opening the root directory. Note the mount
707 * @started time from caller, and time out if this takes too long.
708 */
709 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
710 const char *path,
711 unsigned long started)
712 {
713 struct ceph_mds_client *mdsc = fsc->mdsc;
714 struct ceph_mds_request *req = NULL;
715 int err;
716 struct dentry *root;
717
718 /* open dir */
719 dout("open_root_inode opening '%s'\n", path);
720 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
721 if (IS_ERR(req))
722 return ERR_CAST(req);
723 req->r_path1 = kstrdup(path, GFP_NOFS);
724 if (!req->r_path1) {
725 root = ERR_PTR(-ENOMEM);
726 goto out;
727 }
728
729 req->r_ino1.ino = CEPH_INO_ROOT;
730 req->r_ino1.snap = CEPH_NOSNAP;
731 req->r_started = started;
732 req->r_timeout = fsc->client->options->mount_timeout * HZ;
733 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
734 req->r_num_caps = 2;
735 err = ceph_mdsc_do_request(mdsc, NULL, req);
736 if (err == 0) {
737 struct inode *inode = req->r_target_inode;
738 req->r_target_inode = NULL;
739 dout("open_root_inode success\n");
740 if (ceph_ino(inode) == CEPH_INO_ROOT &&
741 fsc->sb->s_root == NULL) {
742 root = d_make_root(inode);
743 if (!root) {
744 root = ERR_PTR(-ENOMEM);
745 goto out;
746 }
747 } else {
748 root = d_obtain_root(inode);
749 }
750 ceph_init_dentry(root);
751 dout("open_root_inode success, root dentry is %p\n", root);
752 } else {
753 root = ERR_PTR(err);
754 }
755 out:
756 ceph_mdsc_put_request(req);
757 return root;
758 }
759
760
761
762
763 /*
764 * mount: join the ceph cluster, and open root directory.
765 */
766 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
767 const char *path)
768 {
769 int err;
770 unsigned long started = jiffies; /* note the start time */
771 struct dentry *root;
772 int first = 0; /* first vfsmount for this super_block */
773
774 dout("mount start\n");
775 mutex_lock(&fsc->client->mount_mutex);
776
777 err = __ceph_open_session(fsc->client, started);
778 if (err < 0)
779 goto out;
780
781 dout("mount opening root\n");
782 root = open_root_dentry(fsc, "", started);
783 if (IS_ERR(root)) {
784 err = PTR_ERR(root);
785 goto out;
786 }
787 if (fsc->sb->s_root) {
788 dput(root);
789 } else {
790 fsc->sb->s_root = root;
791 first = 1;
792
793 err = ceph_fs_debugfs_init(fsc);
794 if (err < 0)
795 goto fail;
796 }
797
798 if (path[0] == 0) {
799 dget(root);
800 } else {
801 dout("mount opening base mountpoint\n");
802 root = open_root_dentry(fsc, path, started);
803 if (IS_ERR(root)) {
804 err = PTR_ERR(root);
805 goto fail;
806 }
807 }
808
809 fsc->mount_state = CEPH_MOUNT_MOUNTED;
810 dout("mount success\n");
811 mutex_unlock(&fsc->client->mount_mutex);
812 return root;
813
814 out:
815 mutex_unlock(&fsc->client->mount_mutex);
816 return ERR_PTR(err);
817
818 fail:
819 if (first) {
820 dput(fsc->sb->s_root);
821 fsc->sb->s_root = NULL;
822 }
823 goto out;
824 }
825
826 static int ceph_set_super(struct super_block *s, void *data)
827 {
828 struct ceph_fs_client *fsc = data;
829 int ret;
830
831 dout("set_super %p data %p\n", s, data);
832
833 s->s_flags = fsc->mount_options->sb_flags;
834 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
835
836 s->s_xattr = ceph_xattr_handlers;
837 s->s_fs_info = fsc;
838 fsc->sb = s;
839
840 s->s_op = &ceph_super_ops;
841 s->s_export_op = &ceph_export_ops;
842
843 s->s_time_gran = 1000; /* 1000 ns == 1 us */
844
845 ret = set_anon_super(s, NULL); /* what is that second arg for? */
846 if (ret != 0)
847 goto fail;
848
849 return ret;
850
851 fail:
852 s->s_fs_info = NULL;
853 fsc->sb = NULL;
854 return ret;
855 }
856
857 /*
858 * share superblock if same fs AND options
859 */
860 static int ceph_compare_super(struct super_block *sb, void *data)
861 {
862 struct ceph_fs_client *new = data;
863 struct ceph_mount_options *fsopt = new->mount_options;
864 struct ceph_options *opt = new->client->options;
865 struct ceph_fs_client *other = ceph_sb_to_client(sb);
866
867 dout("ceph_compare_super %p\n", sb);
868
869 if (compare_mount_options(fsopt, opt, other)) {
870 dout("monitor(s)/mount options don't match\n");
871 return 0;
872 }
873 if ((opt->flags & CEPH_OPT_FSID) &&
874 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
875 dout("fsid doesn't match\n");
876 return 0;
877 }
878 if (fsopt->sb_flags != other->mount_options->sb_flags) {
879 dout("flags differ\n");
880 return 0;
881 }
882 return 1;
883 }
884
885 /*
886 * construct our own bdi so we can control readahead, etc.
887 */
888 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
889
890 static int ceph_register_bdi(struct super_block *sb,
891 struct ceph_fs_client *fsc)
892 {
893 int err;
894
895 /* set ra_pages based on rasize mount option? */
896 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
897 fsc->backing_dev_info.ra_pages =
898 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
899 >> PAGE_SHIFT;
900 else
901 fsc->backing_dev_info.ra_pages =
902 VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE;
903
904 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
905 atomic_long_inc_return(&bdi_seq));
906 if (!err)
907 sb->s_bdi = &fsc->backing_dev_info;
908 return err;
909 }
910
911 static struct dentry *ceph_mount(struct file_system_type *fs_type,
912 int flags, const char *dev_name, void *data)
913 {
914 struct super_block *sb;
915 struct ceph_fs_client *fsc;
916 struct dentry *res;
917 int err;
918 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
919 const char *path = NULL;
920 struct ceph_mount_options *fsopt = NULL;
921 struct ceph_options *opt = NULL;
922
923 dout("ceph_mount\n");
924
925 #ifdef CONFIG_CEPH_FS_POSIX_ACL
926 flags |= MS_POSIXACL;
927 #endif
928 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
929 if (err < 0) {
930 res = ERR_PTR(err);
931 goto out_final;
932 }
933
934 /* create client (which we may/may not use) */
935 fsc = create_fs_client(fsopt, opt);
936 if (IS_ERR(fsc)) {
937 res = ERR_CAST(fsc);
938 destroy_mount_options(fsopt);
939 ceph_destroy_options(opt);
940 goto out_final;
941 }
942
943 err = ceph_mdsc_init(fsc);
944 if (err < 0) {
945 res = ERR_PTR(err);
946 goto out;
947 }
948
949 if (ceph_test_opt(fsc->client, NOSHARE))
950 compare_super = NULL;
951 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
952 if (IS_ERR(sb)) {
953 res = ERR_CAST(sb);
954 goto out;
955 }
956
957 if (ceph_sb_to_client(sb) != fsc) {
958 ceph_mdsc_destroy(fsc);
959 destroy_fs_client(fsc);
960 fsc = ceph_sb_to_client(sb);
961 dout("get_sb got existing client %p\n", fsc);
962 } else {
963 dout("get_sb using new client %p\n", fsc);
964 err = ceph_register_bdi(sb, fsc);
965 if (err < 0) {
966 res = ERR_PTR(err);
967 goto out_splat;
968 }
969 }
970
971 res = ceph_real_mount(fsc, path);
972 if (IS_ERR(res))
973 goto out_splat;
974 dout("root %p inode %p ino %llx.%llx\n", res,
975 d_inode(res), ceph_vinop(d_inode(res)));
976 return res;
977
978 out_splat:
979 ceph_mdsc_close_sessions(fsc->mdsc);
980 deactivate_locked_super(sb);
981 goto out_final;
982
983 out:
984 ceph_mdsc_destroy(fsc);
985 destroy_fs_client(fsc);
986 out_final:
987 dout("ceph_mount fail %ld\n", PTR_ERR(res));
988 return res;
989 }
990
991 static void ceph_kill_sb(struct super_block *s)
992 {
993 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
994 dev_t dev = s->s_dev;
995
996 dout("kill_sb %p\n", s);
997
998 ceph_mdsc_pre_umount(fsc->mdsc);
999 generic_shutdown_super(s);
1000 ceph_mdsc_destroy(fsc);
1001
1002 destroy_fs_client(fsc);
1003 free_anon_bdev(dev);
1004 }
1005
1006 static struct file_system_type ceph_fs_type = {
1007 .owner = THIS_MODULE,
1008 .name = "ceph",
1009 .mount = ceph_mount,
1010 .kill_sb = ceph_kill_sb,
1011 .fs_flags = FS_RENAME_DOES_D_MOVE,
1012 };
1013 MODULE_ALIAS_FS("ceph");
1014
1015 static int __init init_ceph(void)
1016 {
1017 int ret = init_caches();
1018 if (ret)
1019 goto out;
1020
1021 ceph_flock_init();
1022 ceph_xattr_init();
1023 ret = ceph_snap_init();
1024 if (ret)
1025 goto out_xattr;
1026 ret = register_filesystem(&ceph_fs_type);
1027 if (ret)
1028 goto out_snap;
1029
1030 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1031
1032 return 0;
1033
1034 out_snap:
1035 ceph_snap_exit();
1036 out_xattr:
1037 ceph_xattr_exit();
1038 destroy_caches();
1039 out:
1040 return ret;
1041 }
1042
1043 static void __exit exit_ceph(void)
1044 {
1045 dout("exit_ceph\n");
1046 unregister_filesystem(&ceph_fs_type);
1047 ceph_snap_exit();
1048 ceph_xattr_exit();
1049 destroy_caches();
1050 }
1051
1052 module_init(init_ceph);
1053 module_exit(exit_ceph);
1054
1055 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1056 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1057 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1058 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1059 MODULE_LICENSE("GPL");
Linux with added FPC-III support