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Merge branch 'linux-4.12' of git://github.com/skeggsb/linux into drm-next
[mirror_ubuntu-artful-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 Opt_require_active_mds,
141 Opt_norequire_active_mds,
142 #ifdef CONFIG_CEPH_FS_POSIX_ACL
143 Opt_acl,
144 #endif
145 Opt_noacl,
146 };
147
148 static match_table_t fsopt_tokens = {
149 {Opt_wsize, "wsize=%d"},
150 {Opt_rsize, "rsize=%d"},
151 {Opt_rasize, "rasize=%d"},
152 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
153 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
154 {Opt_cap_release_safety, "cap_release_safety=%d"},
155 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
156 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
157 {Opt_congestion_kb, "write_congestion_kb=%d"},
158 /* int args above */
159 {Opt_snapdirname, "snapdirname=%s"},
160 {Opt_mds_namespace, "mds_namespace=%s"},
161 /* string args above */
162 {Opt_dirstat, "dirstat"},
163 {Opt_nodirstat, "nodirstat"},
164 {Opt_rbytes, "rbytes"},
165 {Opt_norbytes, "norbytes"},
166 {Opt_asyncreaddir, "asyncreaddir"},
167 {Opt_noasyncreaddir, "noasyncreaddir"},
168 {Opt_dcache, "dcache"},
169 {Opt_nodcache, "nodcache"},
170 {Opt_ino32, "ino32"},
171 {Opt_noino32, "noino32"},
172 {Opt_fscache, "fsc"},
173 {Opt_nofscache, "nofsc"},
174 {Opt_poolperm, "poolperm"},
175 {Opt_nopoolperm, "nopoolperm"},
176 {Opt_require_active_mds, "require_active_mds"},
177 {Opt_norequire_active_mds, "norequire_active_mds"},
178 #ifdef CONFIG_CEPH_FS_POSIX_ACL
179 {Opt_acl, "acl"},
180 #endif
181 {Opt_noacl, "noacl"},
182 {-1, NULL}
183 };
184
185 static int parse_fsopt_token(char *c, void *private)
186 {
187 struct ceph_mount_options *fsopt = private;
188 substring_t argstr[MAX_OPT_ARGS];
189 int token, intval, ret;
190
191 token = match_token((char *)c, fsopt_tokens, argstr);
192 if (token < 0)
193 return -EINVAL;
194
195 if (token < Opt_last_int) {
196 ret = match_int(&argstr[0], &intval);
197 if (ret < 0) {
198 pr_err("bad mount option arg (not int) "
199 "at '%s'\n", c);
200 return ret;
201 }
202 dout("got int token %d val %d\n", token, intval);
203 } else if (token > Opt_last_int && token < Opt_last_string) {
204 dout("got string token %d val %s\n", token,
205 argstr[0].from);
206 } else {
207 dout("got token %d\n", token);
208 }
209
210 switch (token) {
211 case Opt_snapdirname:
212 kfree(fsopt->snapdir_name);
213 fsopt->snapdir_name = kstrndup(argstr[0].from,
214 argstr[0].to-argstr[0].from,
215 GFP_KERNEL);
216 if (!fsopt->snapdir_name)
217 return -ENOMEM;
218 break;
219 case Opt_mds_namespace:
220 fsopt->mds_namespace = kstrndup(argstr[0].from,
221 argstr[0].to-argstr[0].from,
222 GFP_KERNEL);
223 if (!fsopt->mds_namespace)
224 return -ENOMEM;
225 break;
226 /* misc */
227 case Opt_wsize:
228 fsopt->wsize = intval;
229 break;
230 case Opt_rsize:
231 fsopt->rsize = intval;
232 break;
233 case Opt_rasize:
234 fsopt->rasize = intval;
235 break;
236 case Opt_caps_wanted_delay_min:
237 fsopt->caps_wanted_delay_min = intval;
238 break;
239 case Opt_caps_wanted_delay_max:
240 fsopt->caps_wanted_delay_max = intval;
241 break;
242 case Opt_readdir_max_entries:
243 fsopt->max_readdir = intval;
244 break;
245 case Opt_readdir_max_bytes:
246 fsopt->max_readdir_bytes = intval;
247 break;
248 case Opt_congestion_kb:
249 fsopt->congestion_kb = intval;
250 break;
251 case Opt_dirstat:
252 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
253 break;
254 case Opt_nodirstat:
255 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
256 break;
257 case Opt_rbytes:
258 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
259 break;
260 case Opt_norbytes:
261 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
262 break;
263 case Opt_asyncreaddir:
264 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
265 break;
266 case Opt_noasyncreaddir:
267 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
268 break;
269 case Opt_dcache:
270 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
271 break;
272 case Opt_nodcache:
273 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
274 break;
275 case Opt_ino32:
276 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
277 break;
278 case Opt_noino32:
279 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
280 break;
281 case Opt_fscache:
282 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
283 break;
284 case Opt_nofscache:
285 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
286 break;
287 case Opt_poolperm:
288 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
289 printk ("pool perm");
290 break;
291 case Opt_nopoolperm:
292 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
293 break;
294 case Opt_require_active_mds:
295 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
296 break;
297 case Opt_norequire_active_mds:
298 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
299 break;
300 #ifdef CONFIG_CEPH_FS_POSIX_ACL
301 case Opt_acl:
302 fsopt->sb_flags |= MS_POSIXACL;
303 break;
304 #endif
305 case Opt_noacl:
306 fsopt->sb_flags &= ~MS_POSIXACL;
307 break;
308 default:
309 BUG_ON(token);
310 }
311 return 0;
312 }
313
314 static void destroy_mount_options(struct ceph_mount_options *args)
315 {
316 dout("destroy_mount_options %p\n", args);
317 kfree(args->snapdir_name);
318 kfree(args->mds_namespace);
319 kfree(args->server_path);
320 kfree(args);
321 }
322
323 static int strcmp_null(const char *s1, const char *s2)
324 {
325 if (!s1 && !s2)
326 return 0;
327 if (s1 && !s2)
328 return -1;
329 if (!s1 && s2)
330 return 1;
331 return strcmp(s1, s2);
332 }
333
334 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
335 struct ceph_options *new_opt,
336 struct ceph_fs_client *fsc)
337 {
338 struct ceph_mount_options *fsopt1 = new_fsopt;
339 struct ceph_mount_options *fsopt2 = fsc->mount_options;
340 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
341 int ret;
342
343 ret = memcmp(fsopt1, fsopt2, ofs);
344 if (ret)
345 return ret;
346
347 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
348 if (ret)
349 return ret;
350 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
351 if (ret)
352 return ret;
353
354 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
355 if (ret)
356 return ret;
357
358 return ceph_compare_options(new_opt, fsc->client);
359 }
360
361 static int parse_mount_options(struct ceph_mount_options **pfsopt,
362 struct ceph_options **popt,
363 int flags, char *options,
364 const char *dev_name)
365 {
366 struct ceph_mount_options *fsopt;
367 const char *dev_name_end;
368 int err;
369
370 if (!dev_name || !*dev_name)
371 return -EINVAL;
372
373 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
374 if (!fsopt)
375 return -ENOMEM;
376
377 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
378
379 fsopt->sb_flags = flags;
380 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
381
382 fsopt->rsize = CEPH_RSIZE_DEFAULT;
383 fsopt->rasize = CEPH_RASIZE_DEFAULT;
384 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
385 if (!fsopt->snapdir_name) {
386 err = -ENOMEM;
387 goto out;
388 }
389
390 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
391 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
392 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
393 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
394 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
395 fsopt->congestion_kb = default_congestion_kb();
396
397 /*
398 * Distinguish the server list from the path in "dev_name".
399 * Internally we do not include the leading '/' in the path.
400 *
401 * "dev_name" will look like:
402 * <server_spec>[,<server_spec>...]:[<path>]
403 * where
404 * <server_spec> is <ip>[:<port>]
405 * <path> is optional, but if present must begin with '/'
406 */
407 dev_name_end = strchr(dev_name, '/');
408 if (dev_name_end) {
409 if (strlen(dev_name_end) > 1) {
410 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
411 if (!fsopt->server_path) {
412 err = -ENOMEM;
413 goto out;
414 }
415 }
416 } else {
417 dev_name_end = dev_name + strlen(dev_name);
418 }
419 err = -EINVAL;
420 dev_name_end--; /* back up to ':' separator */
421 if (dev_name_end < dev_name || *dev_name_end != ':') {
422 pr_err("device name is missing path (no : separator in %s)\n",
423 dev_name);
424 goto out;
425 }
426 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
427 if (fsopt->server_path)
428 dout("server path '%s'\n", fsopt->server_path);
429
430 *popt = ceph_parse_options(options, dev_name, dev_name_end,
431 parse_fsopt_token, (void *)fsopt);
432 if (IS_ERR(*popt)) {
433 err = PTR_ERR(*popt);
434 goto out;
435 }
436
437 /* success */
438 *pfsopt = fsopt;
439 return 0;
440
441 out:
442 destroy_mount_options(fsopt);
443 return err;
444 }
445
446 /**
447 * ceph_show_options - Show mount options in /proc/mounts
448 * @m: seq_file to write to
449 * @root: root of that (sub)tree
450 */
451 static int ceph_show_options(struct seq_file *m, struct dentry *root)
452 {
453 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
454 struct ceph_mount_options *fsopt = fsc->mount_options;
455 size_t pos;
456 int ret;
457
458 /* a comma between MNT/MS and client options */
459 seq_putc(m, ',');
460 pos = m->count;
461
462 ret = ceph_print_client_options(m, fsc->client);
463 if (ret)
464 return ret;
465
466 /* retract our comma if no client options */
467 if (m->count == pos)
468 m->count--;
469
470 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
471 seq_puts(m, ",dirstat");
472 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
473 seq_puts(m, ",rbytes");
474 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
475 seq_puts(m, ",noasyncreaddir");
476 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
477 seq_puts(m, ",nodcache");
478 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
479 seq_puts(m, ",fsc");
480 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
481 seq_puts(m, ",nopoolperm");
482
483 #ifdef CONFIG_CEPH_FS_POSIX_ACL
484 if (fsopt->sb_flags & MS_POSIXACL)
485 seq_puts(m, ",acl");
486 else
487 seq_puts(m, ",noacl");
488 #endif
489
490 if (fsopt->mds_namespace)
491 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
492 if (fsopt->wsize)
493 seq_printf(m, ",wsize=%d", fsopt->wsize);
494 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
495 seq_printf(m, ",rsize=%d", fsopt->rsize);
496 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
497 seq_printf(m, ",rasize=%d", fsopt->rasize);
498 if (fsopt->congestion_kb != default_congestion_kb())
499 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
500 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
501 seq_printf(m, ",caps_wanted_delay_min=%d",
502 fsopt->caps_wanted_delay_min);
503 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
504 seq_printf(m, ",caps_wanted_delay_max=%d",
505 fsopt->caps_wanted_delay_max);
506 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
507 seq_printf(m, ",cap_release_safety=%d",
508 fsopt->cap_release_safety);
509 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
510 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
511 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
512 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
513 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
514 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
515
516 return 0;
517 }
518
519 /*
520 * handle any mon messages the standard library doesn't understand.
521 * return error if we don't either.
522 */
523 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
524 {
525 struct ceph_fs_client *fsc = client->private;
526 int type = le16_to_cpu(msg->hdr.type);
527
528 switch (type) {
529 case CEPH_MSG_MDS_MAP:
530 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
531 return 0;
532 case CEPH_MSG_FS_MAP_USER:
533 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
534 return 0;
535 default:
536 return -1;
537 }
538 }
539
540 /*
541 * create a new fs client
542 */
543 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
544 struct ceph_options *opt)
545 {
546 struct ceph_fs_client *fsc;
547 const u64 supported_features =
548 CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH |
549 CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA;
550 const u64 required_features = 0;
551 int page_count;
552 size_t size;
553 int err = -ENOMEM;
554
555 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
556 if (!fsc)
557 return ERR_PTR(-ENOMEM);
558
559 fsc->client = ceph_create_client(opt, fsc, supported_features,
560 required_features);
561 if (IS_ERR(fsc->client)) {
562 err = PTR_ERR(fsc->client);
563 goto fail;
564 }
565 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
566
567 if (fsopt->mds_namespace == NULL) {
568 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
569 0, true);
570 } else {
571 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
572 0, false);
573 }
574
575 fsc->mount_options = fsopt;
576
577 fsc->sb = NULL;
578 fsc->mount_state = CEPH_MOUNT_MOUNTING;
579
580 atomic_long_set(&fsc->writeback_count, 0);
581
582 err = bdi_init(&fsc->backing_dev_info);
583 if (err < 0)
584 goto fail_client;
585
586 err = -ENOMEM;
587 /*
588 * The number of concurrent works can be high but they don't need
589 * to be processed in parallel, limit concurrency.
590 */
591 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
592 if (fsc->wb_wq == NULL)
593 goto fail_bdi;
594 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
595 if (fsc->pg_inv_wq == NULL)
596 goto fail_wb_wq;
597 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
598 if (fsc->trunc_wq == NULL)
599 goto fail_pg_inv_wq;
600
601 /* set up mempools */
602 err = -ENOMEM;
603 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
604 size = sizeof (struct page *) * (page_count ? page_count : 1);
605 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
606 if (!fsc->wb_pagevec_pool)
607 goto fail_trunc_wq;
608
609 /* setup fscache */
610 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
611 (ceph_fscache_register_fs(fsc) != 0))
612 goto fail_fscache;
613
614 /* caps */
615 fsc->min_caps = fsopt->max_readdir;
616
617 return fsc;
618
619 fail_fscache:
620 ceph_fscache_unregister_fs(fsc);
621 fail_trunc_wq:
622 destroy_workqueue(fsc->trunc_wq);
623 fail_pg_inv_wq:
624 destroy_workqueue(fsc->pg_inv_wq);
625 fail_wb_wq:
626 destroy_workqueue(fsc->wb_wq);
627 fail_bdi:
628 bdi_destroy(&fsc->backing_dev_info);
629 fail_client:
630 ceph_destroy_client(fsc->client);
631 fail:
632 kfree(fsc);
633 return ERR_PTR(err);
634 }
635
636 static void destroy_fs_client(struct ceph_fs_client *fsc)
637 {
638 dout("destroy_fs_client %p\n", fsc);
639
640 ceph_fscache_unregister_fs(fsc);
641
642 destroy_workqueue(fsc->wb_wq);
643 destroy_workqueue(fsc->pg_inv_wq);
644 destroy_workqueue(fsc->trunc_wq);
645
646 bdi_destroy(&fsc->backing_dev_info);
647
648 mempool_destroy(fsc->wb_pagevec_pool);
649
650 destroy_mount_options(fsc->mount_options);
651
652 ceph_fs_debugfs_cleanup(fsc);
653
654 ceph_destroy_client(fsc->client);
655
656 kfree(fsc);
657 dout("destroy_fs_client %p done\n", fsc);
658 }
659
660 /*
661 * caches
662 */
663 struct kmem_cache *ceph_inode_cachep;
664 struct kmem_cache *ceph_cap_cachep;
665 struct kmem_cache *ceph_cap_flush_cachep;
666 struct kmem_cache *ceph_dentry_cachep;
667 struct kmem_cache *ceph_file_cachep;
668
669 static void ceph_inode_init_once(void *foo)
670 {
671 struct ceph_inode_info *ci = foo;
672 inode_init_once(&ci->vfs_inode);
673 }
674
675 static int __init init_caches(void)
676 {
677 int error = -ENOMEM;
678
679 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
680 sizeof(struct ceph_inode_info),
681 __alignof__(struct ceph_inode_info),
682 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
683 SLAB_ACCOUNT, ceph_inode_init_once);
684 if (ceph_inode_cachep == NULL)
685 return -ENOMEM;
686
687 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
688 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
689 if (ceph_cap_cachep == NULL)
690 goto bad_cap;
691 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
692 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
693 if (ceph_cap_flush_cachep == NULL)
694 goto bad_cap_flush;
695
696 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
697 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
698 if (ceph_dentry_cachep == NULL)
699 goto bad_dentry;
700
701 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
702
703 if (ceph_file_cachep == NULL)
704 goto bad_file;
705
706 if ((error = ceph_fscache_register()))
707 goto bad_file;
708
709 return 0;
710 bad_file:
711 kmem_cache_destroy(ceph_dentry_cachep);
712 bad_dentry:
713 kmem_cache_destroy(ceph_cap_flush_cachep);
714 bad_cap_flush:
715 kmem_cache_destroy(ceph_cap_cachep);
716 bad_cap:
717 kmem_cache_destroy(ceph_inode_cachep);
718 return error;
719 }
720
721 static void destroy_caches(void)
722 {
723 /*
724 * Make sure all delayed rcu free inodes are flushed before we
725 * destroy cache.
726 */
727 rcu_barrier();
728
729 kmem_cache_destroy(ceph_inode_cachep);
730 kmem_cache_destroy(ceph_cap_cachep);
731 kmem_cache_destroy(ceph_cap_flush_cachep);
732 kmem_cache_destroy(ceph_dentry_cachep);
733 kmem_cache_destroy(ceph_file_cachep);
734
735 ceph_fscache_unregister();
736 }
737
738
739 /*
740 * ceph_umount_begin - initiate forced umount. Tear down down the
741 * mount, skipping steps that may hang while waiting for server(s).
742 */
743 static void ceph_umount_begin(struct super_block *sb)
744 {
745 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
746
747 dout("ceph_umount_begin - starting forced umount\n");
748 if (!fsc)
749 return;
750 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
751 ceph_mdsc_force_umount(fsc->mdsc);
752 return;
753 }
754
755 static const struct super_operations ceph_super_ops = {
756 .alloc_inode = ceph_alloc_inode,
757 .destroy_inode = ceph_destroy_inode,
758 .write_inode = ceph_write_inode,
759 .drop_inode = ceph_drop_inode,
760 .sync_fs = ceph_sync_fs,
761 .put_super = ceph_put_super,
762 .show_options = ceph_show_options,
763 .statfs = ceph_statfs,
764 .umount_begin = ceph_umount_begin,
765 };
766
767 /*
768 * Bootstrap mount by opening the root directory. Note the mount
769 * @started time from caller, and time out if this takes too long.
770 */
771 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
772 const char *path,
773 unsigned long started)
774 {
775 struct ceph_mds_client *mdsc = fsc->mdsc;
776 struct ceph_mds_request *req = NULL;
777 int err;
778 struct dentry *root;
779
780 /* open dir */
781 dout("open_root_inode opening '%s'\n", path);
782 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
783 if (IS_ERR(req))
784 return ERR_CAST(req);
785 req->r_path1 = kstrdup(path, GFP_NOFS);
786 if (!req->r_path1) {
787 root = ERR_PTR(-ENOMEM);
788 goto out;
789 }
790
791 req->r_ino1.ino = CEPH_INO_ROOT;
792 req->r_ino1.snap = CEPH_NOSNAP;
793 req->r_started = started;
794 req->r_timeout = fsc->client->options->mount_timeout;
795 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
796 req->r_num_caps = 2;
797 err = ceph_mdsc_do_request(mdsc, NULL, req);
798 if (err == 0) {
799 struct inode *inode = req->r_target_inode;
800 req->r_target_inode = NULL;
801 dout("open_root_inode success\n");
802 root = d_make_root(inode);
803 if (!root) {
804 root = ERR_PTR(-ENOMEM);
805 goto out;
806 }
807 dout("open_root_inode success, root dentry is %p\n", root);
808 } else {
809 root = ERR_PTR(err);
810 }
811 out:
812 ceph_mdsc_put_request(req);
813 return root;
814 }
815
816
817
818
819 /*
820 * mount: join the ceph cluster, and open root directory.
821 */
822 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
823 {
824 int err;
825 unsigned long started = jiffies; /* note the start time */
826 struct dentry *root;
827 int first = 0; /* first vfsmount for this super_block */
828
829 dout("mount start %p\n", fsc);
830 mutex_lock(&fsc->client->mount_mutex);
831
832 if (!fsc->sb->s_root) {
833 const char *path;
834 err = __ceph_open_session(fsc->client, started);
835 if (err < 0)
836 goto out;
837
838 if (!fsc->mount_options->server_path) {
839 path = "";
840 dout("mount opening path \\t\n");
841 } else {
842 path = fsc->mount_options->server_path + 1;
843 dout("mount opening path %s\n", path);
844 }
845 root = open_root_dentry(fsc, path, started);
846 if (IS_ERR(root)) {
847 err = PTR_ERR(root);
848 goto out;
849 }
850 fsc->sb->s_root = dget(root);
851 first = 1;
852
853 err = ceph_fs_debugfs_init(fsc);
854 if (err < 0)
855 goto fail;
856 } else {
857 root = dget(fsc->sb->s_root);
858 }
859
860 fsc->mount_state = CEPH_MOUNT_MOUNTED;
861 dout("mount success\n");
862 mutex_unlock(&fsc->client->mount_mutex);
863 return root;
864
865 fail:
866 if (first) {
867 dput(fsc->sb->s_root);
868 fsc->sb->s_root = NULL;
869 }
870 out:
871 mutex_unlock(&fsc->client->mount_mutex);
872 return ERR_PTR(err);
873 }
874
875 static int ceph_set_super(struct super_block *s, void *data)
876 {
877 struct ceph_fs_client *fsc = data;
878 int ret;
879
880 dout("set_super %p data %p\n", s, data);
881
882 s->s_flags = fsc->mount_options->sb_flags;
883 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
884
885 s->s_xattr = ceph_xattr_handlers;
886 s->s_fs_info = fsc;
887 fsc->sb = s;
888
889 s->s_op = &ceph_super_ops;
890 s->s_d_op = &ceph_dentry_ops;
891 s->s_export_op = &ceph_export_ops;
892
893 s->s_time_gran = 1000; /* 1000 ns == 1 us */
894
895 ret = set_anon_super(s, NULL); /* what is that second arg for? */
896 if (ret != 0)
897 goto fail;
898
899 return ret;
900
901 fail:
902 s->s_fs_info = NULL;
903 fsc->sb = NULL;
904 return ret;
905 }
906
907 /*
908 * share superblock if same fs AND options
909 */
910 static int ceph_compare_super(struct super_block *sb, void *data)
911 {
912 struct ceph_fs_client *new = data;
913 struct ceph_mount_options *fsopt = new->mount_options;
914 struct ceph_options *opt = new->client->options;
915 struct ceph_fs_client *other = ceph_sb_to_client(sb);
916
917 dout("ceph_compare_super %p\n", sb);
918
919 if (compare_mount_options(fsopt, opt, other)) {
920 dout("monitor(s)/mount options don't match\n");
921 return 0;
922 }
923 if ((opt->flags & CEPH_OPT_FSID) &&
924 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
925 dout("fsid doesn't match\n");
926 return 0;
927 }
928 if (fsopt->sb_flags != other->mount_options->sb_flags) {
929 dout("flags differ\n");
930 return 0;
931 }
932 return 1;
933 }
934
935 /*
936 * construct our own bdi so we can control readahead, etc.
937 */
938 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
939
940 static int ceph_register_bdi(struct super_block *sb,
941 struct ceph_fs_client *fsc)
942 {
943 int err;
944
945 /* set ra_pages based on rasize mount option? */
946 if (fsc->mount_options->rasize >= PAGE_SIZE)
947 fsc->backing_dev_info.ra_pages =
948 (fsc->mount_options->rasize + PAGE_SIZE - 1)
949 >> PAGE_SHIFT;
950 else
951 fsc->backing_dev_info.ra_pages =
952 VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
953
954 if (fsc->mount_options->rsize > fsc->mount_options->rasize &&
955 fsc->mount_options->rsize >= PAGE_SIZE)
956 fsc->backing_dev_info.io_pages =
957 (fsc->mount_options->rsize + PAGE_SIZE - 1)
958 >> PAGE_SHIFT;
959 else if (fsc->mount_options->rsize == 0)
960 fsc->backing_dev_info.io_pages = ULONG_MAX;
961
962 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
963 atomic_long_inc_return(&bdi_seq));
964 if (!err)
965 sb->s_bdi = &fsc->backing_dev_info;
966 return err;
967 }
968
969 static struct dentry *ceph_mount(struct file_system_type *fs_type,
970 int flags, const char *dev_name, void *data)
971 {
972 struct super_block *sb;
973 struct ceph_fs_client *fsc;
974 struct dentry *res;
975 int err;
976 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
977 struct ceph_mount_options *fsopt = NULL;
978 struct ceph_options *opt = NULL;
979
980 dout("ceph_mount\n");
981
982 #ifdef CONFIG_CEPH_FS_POSIX_ACL
983 flags |= MS_POSIXACL;
984 #endif
985 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
986 if (err < 0) {
987 res = ERR_PTR(err);
988 goto out_final;
989 }
990
991 /* create client (which we may/may not use) */
992 fsc = create_fs_client(fsopt, opt);
993 if (IS_ERR(fsc)) {
994 res = ERR_CAST(fsc);
995 destroy_mount_options(fsopt);
996 ceph_destroy_options(opt);
997 goto out_final;
998 }
999
1000 err = ceph_mdsc_init(fsc);
1001 if (err < 0) {
1002 res = ERR_PTR(err);
1003 goto out;
1004 }
1005
1006 if (ceph_test_opt(fsc->client, NOSHARE))
1007 compare_super = NULL;
1008 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1009 if (IS_ERR(sb)) {
1010 res = ERR_CAST(sb);
1011 goto out;
1012 }
1013
1014 if (ceph_sb_to_client(sb) != fsc) {
1015 ceph_mdsc_destroy(fsc);
1016 destroy_fs_client(fsc);
1017 fsc = ceph_sb_to_client(sb);
1018 dout("get_sb got existing client %p\n", fsc);
1019 } else {
1020 dout("get_sb using new client %p\n", fsc);
1021 err = ceph_register_bdi(sb, fsc);
1022 if (err < 0) {
1023 res = ERR_PTR(err);
1024 goto out_splat;
1025 }
1026 }
1027
1028 res = ceph_real_mount(fsc);
1029 if (IS_ERR(res))
1030 goto out_splat;
1031 dout("root %p inode %p ino %llx.%llx\n", res,
1032 d_inode(res), ceph_vinop(d_inode(res)));
1033 return res;
1034
1035 out_splat:
1036 ceph_mdsc_close_sessions(fsc->mdsc);
1037 deactivate_locked_super(sb);
1038 goto out_final;
1039
1040 out:
1041 ceph_mdsc_destroy(fsc);
1042 destroy_fs_client(fsc);
1043 out_final:
1044 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1045 return res;
1046 }
1047
1048 static void ceph_kill_sb(struct super_block *s)
1049 {
1050 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1051 dev_t dev = s->s_dev;
1052
1053 dout("kill_sb %p\n", s);
1054
1055 ceph_mdsc_pre_umount(fsc->mdsc);
1056 generic_shutdown_super(s);
1057 ceph_mdsc_destroy(fsc);
1058
1059 destroy_fs_client(fsc);
1060 free_anon_bdev(dev);
1061 }
1062
1063 static struct file_system_type ceph_fs_type = {
1064 .owner = THIS_MODULE,
1065 .name = "ceph",
1066 .mount = ceph_mount,
1067 .kill_sb = ceph_kill_sb,
1068 .fs_flags = FS_RENAME_DOES_D_MOVE,
1069 };
1070 MODULE_ALIAS_FS("ceph");
1071
1072 static int __init init_ceph(void)
1073 {
1074 int ret = init_caches();
1075 if (ret)
1076 goto out;
1077
1078 ceph_flock_init();
1079 ceph_xattr_init();
1080 ret = register_filesystem(&ceph_fs_type);
1081 if (ret)
1082 goto out_xattr;
1083
1084 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1085
1086 return 0;
1087
1088 out_xattr:
1089 ceph_xattr_exit();
1090 destroy_caches();
1091 out:
1092 return ret;
1093 }
1094
1095 static void __exit exit_ceph(void)
1096 {
1097 dout("exit_ceph\n");
1098 unregister_filesystem(&ceph_fs_type);
1099 ceph_xattr_exit();
1100 destroy_caches();
1101 }
1102
1103 module_init(init_ceph);
1104 module_exit(exit_ceph);
1105
1106 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1107 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1108 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1109 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1110 MODULE_LICENSE("GPL");
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