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Merge tag 'for-linus-4.10-ofs1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-zesty-kernel.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 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_mds_namespace,
124 Opt_last_string,
125 /* string args above */
126 Opt_dirstat,
127 Opt_nodirstat,
128 Opt_rbytes,
129 Opt_norbytes,
130 Opt_asyncreaddir,
131 Opt_noasyncreaddir,
132 Opt_dcache,
133 Opt_nodcache,
134 Opt_ino32,
135 Opt_noino32,
136 Opt_fscache,
137 Opt_nofscache,
138 Opt_poolperm,
139 Opt_nopoolperm,
140 #ifdef CONFIG_CEPH_FS_POSIX_ACL
141 Opt_acl,
142 #endif
143 Opt_noacl,
144 };
145
146 static match_table_t fsopt_tokens = {
147 {Opt_wsize, "wsize=%d"},
148 {Opt_rsize, "rsize=%d"},
149 {Opt_rasize, "rasize=%d"},
150 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
151 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
152 {Opt_cap_release_safety, "cap_release_safety=%d"},
153 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
154 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
155 {Opt_congestion_kb, "write_congestion_kb=%d"},
156 /* int args above */
157 {Opt_snapdirname, "snapdirname=%s"},
158 {Opt_mds_namespace, "mds_namespace=%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 {Opt_fscache, "fsc"},
171 {Opt_nofscache, "nofsc"},
172 {Opt_poolperm, "poolperm"},
173 {Opt_nopoolperm, "nopoolperm"},
174 #ifdef CONFIG_CEPH_FS_POSIX_ACL
175 {Opt_acl, "acl"},
176 #endif
177 {Opt_noacl, "noacl"},
178 {-1, NULL}
179 };
180
181 static int parse_fsopt_token(char *c, void *private)
182 {
183 struct ceph_mount_options *fsopt = private;
184 substring_t argstr[MAX_OPT_ARGS];
185 int token, intval, ret;
186
187 token = match_token((char *)c, fsopt_tokens, argstr);
188 if (token < 0)
189 return -EINVAL;
190
191 if (token < Opt_last_int) {
192 ret = match_int(&argstr[0], &intval);
193 if (ret < 0) {
194 pr_err("bad mount option arg (not int) "
195 "at '%s'\n", c);
196 return ret;
197 }
198 dout("got int token %d val %d\n", token, intval);
199 } else if (token > Opt_last_int && token < Opt_last_string) {
200 dout("got string token %d val %s\n", token,
201 argstr[0].from);
202 } else {
203 dout("got token %d\n", token);
204 }
205
206 switch (token) {
207 case Opt_snapdirname:
208 kfree(fsopt->snapdir_name);
209 fsopt->snapdir_name = kstrndup(argstr[0].from,
210 argstr[0].to-argstr[0].from,
211 GFP_KERNEL);
212 if (!fsopt->snapdir_name)
213 return -ENOMEM;
214 break;
215 case Opt_mds_namespace:
216 fsopt->mds_namespace = kstrndup(argstr[0].from,
217 argstr[0].to-argstr[0].from,
218 GFP_KERNEL);
219 if (!fsopt->mds_namespace)
220 return -ENOMEM;
221 break;
222 /* misc */
223 case Opt_wsize:
224 fsopt->wsize = intval;
225 break;
226 case Opt_rsize:
227 fsopt->rsize = intval;
228 break;
229 case Opt_rasize:
230 fsopt->rasize = intval;
231 break;
232 case Opt_caps_wanted_delay_min:
233 fsopt->caps_wanted_delay_min = intval;
234 break;
235 case Opt_caps_wanted_delay_max:
236 fsopt->caps_wanted_delay_max = intval;
237 break;
238 case Opt_readdir_max_entries:
239 fsopt->max_readdir = intval;
240 break;
241 case Opt_readdir_max_bytes:
242 fsopt->max_readdir_bytes = intval;
243 break;
244 case Opt_congestion_kb:
245 fsopt->congestion_kb = intval;
246 break;
247 case Opt_dirstat:
248 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
249 break;
250 case Opt_nodirstat:
251 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
252 break;
253 case Opt_rbytes:
254 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
255 break;
256 case Opt_norbytes:
257 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
258 break;
259 case Opt_asyncreaddir:
260 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
261 break;
262 case Opt_noasyncreaddir:
263 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
264 break;
265 case Opt_dcache:
266 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
267 break;
268 case Opt_nodcache:
269 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
270 break;
271 case Opt_ino32:
272 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
273 break;
274 case Opt_noino32:
275 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
276 break;
277 case Opt_fscache:
278 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
279 break;
280 case Opt_nofscache:
281 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
282 break;
283 case Opt_poolperm:
284 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
285 printk ("pool perm");
286 break;
287 case Opt_nopoolperm:
288 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
289 break;
290 #ifdef CONFIG_CEPH_FS_POSIX_ACL
291 case Opt_acl:
292 fsopt->sb_flags |= MS_POSIXACL;
293 break;
294 #endif
295 case Opt_noacl:
296 fsopt->sb_flags &= ~MS_POSIXACL;
297 break;
298 default:
299 BUG_ON(token);
300 }
301 return 0;
302 }
303
304 static void destroy_mount_options(struct ceph_mount_options *args)
305 {
306 dout("destroy_mount_options %p\n", args);
307 kfree(args->snapdir_name);
308 kfree(args->mds_namespace);
309 kfree(args->server_path);
310 kfree(args);
311 }
312
313 static int strcmp_null(const char *s1, const char *s2)
314 {
315 if (!s1 && !s2)
316 return 0;
317 if (s1 && !s2)
318 return -1;
319 if (!s1 && s2)
320 return 1;
321 return strcmp(s1, s2);
322 }
323
324 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
325 struct ceph_options *new_opt,
326 struct ceph_fs_client *fsc)
327 {
328 struct ceph_mount_options *fsopt1 = new_fsopt;
329 struct ceph_mount_options *fsopt2 = fsc->mount_options;
330 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
331 int ret;
332
333 ret = memcmp(fsopt1, fsopt2, ofs);
334 if (ret)
335 return ret;
336
337 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
338 if (ret)
339 return ret;
340 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
341 if (ret)
342 return ret;
343
344 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
345 if (ret)
346 return ret;
347
348 return ceph_compare_options(new_opt, fsc->client);
349 }
350
351 static int parse_mount_options(struct ceph_mount_options **pfsopt,
352 struct ceph_options **popt,
353 int flags, char *options,
354 const char *dev_name)
355 {
356 struct ceph_mount_options *fsopt;
357 const char *dev_name_end;
358 int err;
359
360 if (!dev_name || !*dev_name)
361 return -EINVAL;
362
363 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
364 if (!fsopt)
365 return -ENOMEM;
366
367 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
368
369 fsopt->sb_flags = flags;
370 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
371
372 fsopt->rsize = CEPH_RSIZE_DEFAULT;
373 fsopt->rasize = CEPH_RASIZE_DEFAULT;
374 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
375 if (!fsopt->snapdir_name) {
376 err = -ENOMEM;
377 goto out;
378 }
379
380 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
381 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
382 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
383 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
384 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
385 fsopt->congestion_kb = default_congestion_kb();
386
387 /*
388 * Distinguish the server list from the path in "dev_name".
389 * Internally we do not include the leading '/' in the path.
390 *
391 * "dev_name" will look like:
392 * <server_spec>[,<server_spec>...]:[<path>]
393 * where
394 * <server_spec> is <ip>[:<port>]
395 * <path> is optional, but if present must begin with '/'
396 */
397 dev_name_end = strchr(dev_name, '/');
398 if (dev_name_end) {
399 if (strlen(dev_name_end) > 1) {
400 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
401 if (!fsopt->server_path) {
402 err = -ENOMEM;
403 goto out;
404 }
405 }
406 } else {
407 dev_name_end = dev_name + strlen(dev_name);
408 }
409 err = -EINVAL;
410 dev_name_end--; /* back up to ':' separator */
411 if (dev_name_end < dev_name || *dev_name_end != ':') {
412 pr_err("device name is missing path (no : separator in %s)\n",
413 dev_name);
414 goto out;
415 }
416 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
417 if (fsopt->server_path)
418 dout("server path '%s'\n", fsopt->server_path);
419
420 *popt = ceph_parse_options(options, dev_name, dev_name_end,
421 parse_fsopt_token, (void *)fsopt);
422 if (IS_ERR(*popt)) {
423 err = PTR_ERR(*popt);
424 goto out;
425 }
426
427 /* success */
428 *pfsopt = fsopt;
429 return 0;
430
431 out:
432 destroy_mount_options(fsopt);
433 return err;
434 }
435
436 /**
437 * ceph_show_options - Show mount options in /proc/mounts
438 * @m: seq_file to write to
439 * @root: root of that (sub)tree
440 */
441 static int ceph_show_options(struct seq_file *m, struct dentry *root)
442 {
443 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
444 struct ceph_mount_options *fsopt = fsc->mount_options;
445 size_t pos;
446 int ret;
447
448 /* a comma between MNT/MS and client options */
449 seq_putc(m, ',');
450 pos = m->count;
451
452 ret = ceph_print_client_options(m, fsc->client);
453 if (ret)
454 return ret;
455
456 /* retract our comma if no client options */
457 if (m->count == pos)
458 m->count--;
459
460 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
461 seq_puts(m, ",dirstat");
462 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
463 seq_puts(m, ",rbytes");
464 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
465 seq_puts(m, ",noasyncreaddir");
466 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
467 seq_puts(m, ",nodcache");
468 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
469 seq_puts(m, ",fsc");
470 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
471 seq_puts(m, ",nopoolperm");
472
473 #ifdef CONFIG_CEPH_FS_POSIX_ACL
474 if (fsopt->sb_flags & MS_POSIXACL)
475 seq_puts(m, ",acl");
476 else
477 seq_puts(m, ",noacl");
478 #endif
479
480 if (fsopt->mds_namespace)
481 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
482 if (fsopt->wsize)
483 seq_printf(m, ",wsize=%d", fsopt->wsize);
484 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
485 seq_printf(m, ",rsize=%d", fsopt->rsize);
486 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
487 seq_printf(m, ",rasize=%d", fsopt->rasize);
488 if (fsopt->congestion_kb != default_congestion_kb())
489 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
490 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
491 seq_printf(m, ",caps_wanted_delay_min=%d",
492 fsopt->caps_wanted_delay_min);
493 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
494 seq_printf(m, ",caps_wanted_delay_max=%d",
495 fsopt->caps_wanted_delay_max);
496 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
497 seq_printf(m, ",cap_release_safety=%d",
498 fsopt->cap_release_safety);
499 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
500 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
501 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
502 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
503 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
504 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
505
506 return 0;
507 }
508
509 /*
510 * handle any mon messages the standard library doesn't understand.
511 * return error if we don't either.
512 */
513 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
514 {
515 struct ceph_fs_client *fsc = client->private;
516 int type = le16_to_cpu(msg->hdr.type);
517
518 switch (type) {
519 case CEPH_MSG_MDS_MAP:
520 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
521 return 0;
522 case CEPH_MSG_FS_MAP_USER:
523 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
524 return 0;
525 default:
526 return -1;
527 }
528 }
529
530 /*
531 * create a new fs client
532 */
533 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
534 struct ceph_options *opt)
535 {
536 struct ceph_fs_client *fsc;
537 const u64 supported_features =
538 CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH |
539 CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA;
540 const u64 required_features = 0;
541 int page_count;
542 size_t size;
543 int err = -ENOMEM;
544
545 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
546 if (!fsc)
547 return ERR_PTR(-ENOMEM);
548
549 fsc->client = ceph_create_client(opt, fsc, supported_features,
550 required_features);
551 if (IS_ERR(fsc->client)) {
552 err = PTR_ERR(fsc->client);
553 goto fail;
554 }
555 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
556
557 if (fsopt->mds_namespace == NULL) {
558 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
559 0, true);
560 } else {
561 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
562 0, false);
563 }
564
565 fsc->mount_options = fsopt;
566
567 fsc->sb = NULL;
568 fsc->mount_state = CEPH_MOUNT_MOUNTING;
569
570 atomic_long_set(&fsc->writeback_count, 0);
571
572 err = bdi_init(&fsc->backing_dev_info);
573 if (err < 0)
574 goto fail_client;
575
576 err = -ENOMEM;
577 /*
578 * The number of concurrent works can be high but they don't need
579 * to be processed in parallel, limit concurrency.
580 */
581 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
582 if (fsc->wb_wq == NULL)
583 goto fail_bdi;
584 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
585 if (fsc->pg_inv_wq == NULL)
586 goto fail_wb_wq;
587 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
588 if (fsc->trunc_wq == NULL)
589 goto fail_pg_inv_wq;
590
591 /* set up mempools */
592 err = -ENOMEM;
593 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
594 size = sizeof (struct page *) * (page_count ? page_count : 1);
595 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
596 if (!fsc->wb_pagevec_pool)
597 goto fail_trunc_wq;
598
599 /* setup fscache */
600 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
601 (ceph_fscache_register_fs(fsc) != 0))
602 goto fail_fscache;
603
604 /* caps */
605 fsc->min_caps = fsopt->max_readdir;
606
607 return fsc;
608
609 fail_fscache:
610 ceph_fscache_unregister_fs(fsc);
611 fail_trunc_wq:
612 destroy_workqueue(fsc->trunc_wq);
613 fail_pg_inv_wq:
614 destroy_workqueue(fsc->pg_inv_wq);
615 fail_wb_wq:
616 destroy_workqueue(fsc->wb_wq);
617 fail_bdi:
618 bdi_destroy(&fsc->backing_dev_info);
619 fail_client:
620 ceph_destroy_client(fsc->client);
621 fail:
622 kfree(fsc);
623 return ERR_PTR(err);
624 }
625
626 static void destroy_fs_client(struct ceph_fs_client *fsc)
627 {
628 dout("destroy_fs_client %p\n", fsc);
629
630 ceph_fscache_unregister_fs(fsc);
631
632 destroy_workqueue(fsc->wb_wq);
633 destroy_workqueue(fsc->pg_inv_wq);
634 destroy_workqueue(fsc->trunc_wq);
635
636 bdi_destroy(&fsc->backing_dev_info);
637
638 mempool_destroy(fsc->wb_pagevec_pool);
639
640 destroy_mount_options(fsc->mount_options);
641
642 ceph_fs_debugfs_cleanup(fsc);
643
644 ceph_destroy_client(fsc->client);
645
646 kfree(fsc);
647 dout("destroy_fs_client %p done\n", fsc);
648 }
649
650 /*
651 * caches
652 */
653 struct kmem_cache *ceph_inode_cachep;
654 struct kmem_cache *ceph_cap_cachep;
655 struct kmem_cache *ceph_cap_flush_cachep;
656 struct kmem_cache *ceph_dentry_cachep;
657 struct kmem_cache *ceph_file_cachep;
658
659 static void ceph_inode_init_once(void *foo)
660 {
661 struct ceph_inode_info *ci = foo;
662 inode_init_once(&ci->vfs_inode);
663 }
664
665 static int __init init_caches(void)
666 {
667 int error = -ENOMEM;
668
669 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
670 sizeof(struct ceph_inode_info),
671 __alignof__(struct ceph_inode_info),
672 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
673 SLAB_ACCOUNT, ceph_inode_init_once);
674 if (ceph_inode_cachep == NULL)
675 return -ENOMEM;
676
677 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
678 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
679 if (ceph_cap_cachep == NULL)
680 goto bad_cap;
681 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
682 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
683 if (ceph_cap_flush_cachep == NULL)
684 goto bad_cap_flush;
685
686 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
687 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
688 if (ceph_dentry_cachep == NULL)
689 goto bad_dentry;
690
691 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
692
693 if (ceph_file_cachep == NULL)
694 goto bad_file;
695
696 if ((error = ceph_fscache_register()))
697 goto bad_file;
698
699 return 0;
700 bad_file:
701 kmem_cache_destroy(ceph_dentry_cachep);
702 bad_dentry:
703 kmem_cache_destroy(ceph_cap_flush_cachep);
704 bad_cap_flush:
705 kmem_cache_destroy(ceph_cap_cachep);
706 bad_cap:
707 kmem_cache_destroy(ceph_inode_cachep);
708 return error;
709 }
710
711 static void destroy_caches(void)
712 {
713 /*
714 * Make sure all delayed rcu free inodes are flushed before we
715 * destroy cache.
716 */
717 rcu_barrier();
718
719 kmem_cache_destroy(ceph_inode_cachep);
720 kmem_cache_destroy(ceph_cap_cachep);
721 kmem_cache_destroy(ceph_cap_flush_cachep);
722 kmem_cache_destroy(ceph_dentry_cachep);
723 kmem_cache_destroy(ceph_file_cachep);
724
725 ceph_fscache_unregister();
726 }
727
728
729 /*
730 * ceph_umount_begin - initiate forced umount. Tear down down the
731 * mount, skipping steps that may hang while waiting for server(s).
732 */
733 static void ceph_umount_begin(struct super_block *sb)
734 {
735 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
736
737 dout("ceph_umount_begin - starting forced umount\n");
738 if (!fsc)
739 return;
740 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
741 ceph_mdsc_force_umount(fsc->mdsc);
742 return;
743 }
744
745 static const struct super_operations ceph_super_ops = {
746 .alloc_inode = ceph_alloc_inode,
747 .destroy_inode = ceph_destroy_inode,
748 .write_inode = ceph_write_inode,
749 .drop_inode = ceph_drop_inode,
750 .evict_inode = ceph_evict_inode,
751 .sync_fs = ceph_sync_fs,
752 .put_super = ceph_put_super,
753 .show_options = ceph_show_options,
754 .statfs = ceph_statfs,
755 .umount_begin = ceph_umount_begin,
756 };
757
758 /*
759 * Bootstrap mount by opening the root directory. Note the mount
760 * @started time from caller, and time out if this takes too long.
761 */
762 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
763 const char *path,
764 unsigned long started)
765 {
766 struct ceph_mds_client *mdsc = fsc->mdsc;
767 struct ceph_mds_request *req = NULL;
768 int err;
769 struct dentry *root;
770
771 /* open dir */
772 dout("open_root_inode opening '%s'\n", path);
773 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
774 if (IS_ERR(req))
775 return ERR_CAST(req);
776 req->r_path1 = kstrdup(path, GFP_NOFS);
777 if (!req->r_path1) {
778 root = ERR_PTR(-ENOMEM);
779 goto out;
780 }
781
782 req->r_ino1.ino = CEPH_INO_ROOT;
783 req->r_ino1.snap = CEPH_NOSNAP;
784 req->r_started = started;
785 req->r_timeout = fsc->client->options->mount_timeout;
786 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
787 req->r_num_caps = 2;
788 err = ceph_mdsc_do_request(mdsc, NULL, req);
789 if (err == 0) {
790 struct inode *inode = req->r_target_inode;
791 req->r_target_inode = NULL;
792 dout("open_root_inode success\n");
793 root = d_make_root(inode);
794 if (!root) {
795 root = ERR_PTR(-ENOMEM);
796 goto out;
797 }
798 ceph_init_dentry(root);
799 dout("open_root_inode success, root dentry is %p\n", root);
800 } else {
801 root = ERR_PTR(err);
802 }
803 out:
804 ceph_mdsc_put_request(req);
805 return root;
806 }
807
808
809
810
811 /*
812 * mount: join the ceph cluster, and open root directory.
813 */
814 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
815 {
816 int err;
817 unsigned long started = jiffies; /* note the start time */
818 struct dentry *root;
819 int first = 0; /* first vfsmount for this super_block */
820
821 dout("mount start %p\n", fsc);
822 mutex_lock(&fsc->client->mount_mutex);
823
824 if (!fsc->sb->s_root) {
825 const char *path;
826 err = __ceph_open_session(fsc->client, started);
827 if (err < 0)
828 goto out;
829
830 if (!fsc->mount_options->server_path) {
831 path = "";
832 dout("mount opening path \\t\n");
833 } else {
834 path = fsc->mount_options->server_path + 1;
835 dout("mount opening path %s\n", path);
836 }
837 root = open_root_dentry(fsc, path, started);
838 if (IS_ERR(root)) {
839 err = PTR_ERR(root);
840 goto out;
841 }
842 fsc->sb->s_root = dget(root);
843 first = 1;
844
845 err = ceph_fs_debugfs_init(fsc);
846 if (err < 0)
847 goto fail;
848 } else {
849 root = dget(fsc->sb->s_root);
850 }
851
852 fsc->mount_state = CEPH_MOUNT_MOUNTED;
853 dout("mount success\n");
854 mutex_unlock(&fsc->client->mount_mutex);
855 return root;
856
857 fail:
858 if (first) {
859 dput(fsc->sb->s_root);
860 fsc->sb->s_root = NULL;
861 }
862 out:
863 mutex_unlock(&fsc->client->mount_mutex);
864 return ERR_PTR(err);
865 }
866
867 static int ceph_set_super(struct super_block *s, void *data)
868 {
869 struct ceph_fs_client *fsc = data;
870 int ret;
871
872 dout("set_super %p data %p\n", s, data);
873
874 s->s_flags = fsc->mount_options->sb_flags;
875 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
876
877 s->s_xattr = ceph_xattr_handlers;
878 s->s_fs_info = fsc;
879 fsc->sb = s;
880
881 s->s_op = &ceph_super_ops;
882 s->s_export_op = &ceph_export_ops;
883
884 s->s_time_gran = 1000; /* 1000 ns == 1 us */
885
886 ret = set_anon_super(s, NULL); /* what is that second arg for? */
887 if (ret != 0)
888 goto fail;
889
890 return ret;
891
892 fail:
893 s->s_fs_info = NULL;
894 fsc->sb = NULL;
895 return ret;
896 }
897
898 /*
899 * share superblock if same fs AND options
900 */
901 static int ceph_compare_super(struct super_block *sb, void *data)
902 {
903 struct ceph_fs_client *new = data;
904 struct ceph_mount_options *fsopt = new->mount_options;
905 struct ceph_options *opt = new->client->options;
906 struct ceph_fs_client *other = ceph_sb_to_client(sb);
907
908 dout("ceph_compare_super %p\n", sb);
909
910 if (compare_mount_options(fsopt, opt, other)) {
911 dout("monitor(s)/mount options don't match\n");
912 return 0;
913 }
914 if ((opt->flags & CEPH_OPT_FSID) &&
915 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
916 dout("fsid doesn't match\n");
917 return 0;
918 }
919 if (fsopt->sb_flags != other->mount_options->sb_flags) {
920 dout("flags differ\n");
921 return 0;
922 }
923 return 1;
924 }
925
926 /*
927 * construct our own bdi so we can control readahead, etc.
928 */
929 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
930
931 static int ceph_register_bdi(struct super_block *sb,
932 struct ceph_fs_client *fsc)
933 {
934 int err;
935
936 /* set ra_pages based on rasize mount option? */
937 if (fsc->mount_options->rasize >= PAGE_SIZE)
938 fsc->backing_dev_info.ra_pages =
939 (fsc->mount_options->rasize + PAGE_SIZE - 1)
940 >> PAGE_SHIFT;
941 else
942 fsc->backing_dev_info.ra_pages =
943 VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
944
945 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
946 atomic_long_inc_return(&bdi_seq));
947 if (!err)
948 sb->s_bdi = &fsc->backing_dev_info;
949 return err;
950 }
951
952 static struct dentry *ceph_mount(struct file_system_type *fs_type,
953 int flags, const char *dev_name, void *data)
954 {
955 struct super_block *sb;
956 struct ceph_fs_client *fsc;
957 struct dentry *res;
958 int err;
959 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
960 struct ceph_mount_options *fsopt = NULL;
961 struct ceph_options *opt = NULL;
962
963 dout("ceph_mount\n");
964
965 #ifdef CONFIG_CEPH_FS_POSIX_ACL
966 flags |= MS_POSIXACL;
967 #endif
968 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
969 if (err < 0) {
970 res = ERR_PTR(err);
971 goto out_final;
972 }
973
974 /* create client (which we may/may not use) */
975 fsc = create_fs_client(fsopt, opt);
976 if (IS_ERR(fsc)) {
977 res = ERR_CAST(fsc);
978 destroy_mount_options(fsopt);
979 ceph_destroy_options(opt);
980 goto out_final;
981 }
982
983 err = ceph_mdsc_init(fsc);
984 if (err < 0) {
985 res = ERR_PTR(err);
986 goto out;
987 }
988
989 if (ceph_test_opt(fsc->client, NOSHARE))
990 compare_super = NULL;
991 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
992 if (IS_ERR(sb)) {
993 res = ERR_CAST(sb);
994 goto out;
995 }
996
997 if (ceph_sb_to_client(sb) != fsc) {
998 ceph_mdsc_destroy(fsc);
999 destroy_fs_client(fsc);
1000 fsc = ceph_sb_to_client(sb);
1001 dout("get_sb got existing client %p\n", fsc);
1002 } else {
1003 dout("get_sb using new client %p\n", fsc);
1004 err = ceph_register_bdi(sb, fsc);
1005 if (err < 0) {
1006 res = ERR_PTR(err);
1007 goto out_splat;
1008 }
1009 }
1010
1011 res = ceph_real_mount(fsc);
1012 if (IS_ERR(res))
1013 goto out_splat;
1014 dout("root %p inode %p ino %llx.%llx\n", res,
1015 d_inode(res), ceph_vinop(d_inode(res)));
1016 return res;
1017
1018 out_splat:
1019 ceph_mdsc_close_sessions(fsc->mdsc);
1020 deactivate_locked_super(sb);
1021 goto out_final;
1022
1023 out:
1024 ceph_mdsc_destroy(fsc);
1025 destroy_fs_client(fsc);
1026 out_final:
1027 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1028 return res;
1029 }
1030
1031 static void ceph_kill_sb(struct super_block *s)
1032 {
1033 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1034 dev_t dev = s->s_dev;
1035
1036 dout("kill_sb %p\n", s);
1037
1038 ceph_mdsc_pre_umount(fsc->mdsc);
1039 generic_shutdown_super(s);
1040 ceph_mdsc_destroy(fsc);
1041
1042 destroy_fs_client(fsc);
1043 free_anon_bdev(dev);
1044 }
1045
1046 static struct file_system_type ceph_fs_type = {
1047 .owner = THIS_MODULE,
1048 .name = "ceph",
1049 .mount = ceph_mount,
1050 .kill_sb = ceph_kill_sb,
1051 .fs_flags = FS_RENAME_DOES_D_MOVE,
1052 };
1053 MODULE_ALIAS_FS("ceph");
1054
1055 static int __init init_ceph(void)
1056 {
1057 int ret = init_caches();
1058 if (ret)
1059 goto out;
1060
1061 ceph_flock_init();
1062 ceph_xattr_init();
1063 ret = register_filesystem(&ceph_fs_type);
1064 if (ret)
1065 goto out_xattr;
1066
1067 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1068
1069 return 0;
1070
1071 out_xattr:
1072 ceph_xattr_exit();
1073 destroy_caches();
1074 out:
1075 return ret;
1076 }
1077
1078 static void __exit exit_ceph(void)
1079 {
1080 dout("exit_ceph\n");
1081 unregister_filesystem(&ceph_fs_type);
1082 ceph_xattr_exit();
1083 destroy_caches();
1084 }
1085
1086 module_init(init_ceph);
1087 module_exit(exit_ceph);
1088
1089 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1090 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1091 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1092 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1093 MODULE_LICENSE("GPL");
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