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ALSA: hda - Adding one more ALC255 pin definition for headset problem
[linux/fpc-iii.git] / fs / ceph / super.c
blobe247f6f0feb7290c5975b5fac068fc19b4887f6f
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 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
400 if (!fsopt->server_path) {
401 err = -ENOMEM;
402 goto out;
403 }
404 } else {
405 dev_name_end = dev_name + strlen(dev_name);
406 }
407 err = -EINVAL;
408 dev_name_end--; /* back up to ':' separator */
409 if (dev_name_end < dev_name || *dev_name_end != ':') {
410 pr_err("device name is missing path (no : separator in %s)\n",
411 dev_name);
412 goto out;
413 }
414 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
415 if (fsopt->server_path)
416 dout("server path '%s'\n", fsopt->server_path);
417
418 *popt = ceph_parse_options(options, dev_name, dev_name_end,
419 parse_fsopt_token, (void *)fsopt);
420 if (IS_ERR(*popt)) {
421 err = PTR_ERR(*popt);
422 goto out;
423 }
424
425 /* success */
426 *pfsopt = fsopt;
427 return 0;
428
429 out:
430 destroy_mount_options(fsopt);
431 return err;
432 }
433
434 /**
435 * ceph_show_options - Show mount options in /proc/mounts
436 * @m: seq_file to write to
437 * @root: root of that (sub)tree
438 */
439 static int ceph_show_options(struct seq_file *m, struct dentry *root)
440 {
441 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
442 struct ceph_mount_options *fsopt = fsc->mount_options;
443 size_t pos;
444 int ret;
445
446 /* a comma between MNT/MS and client options */
447 seq_putc(m, ',');
448 pos = m->count;
449
450 ret = ceph_print_client_options(m, fsc->client);
451 if (ret)
452 return ret;
453
454 /* retract our comma if no client options */
455 if (m->count == pos)
456 m->count--;
457
458 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
459 seq_puts(m, ",dirstat");
460 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
461 seq_puts(m, ",rbytes");
462 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
463 seq_puts(m, ",noasyncreaddir");
464 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
465 seq_puts(m, ",nodcache");
466 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
467 seq_puts(m, ",fsc");
468 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
469 seq_puts(m, ",nopoolperm");
470
471 #ifdef CONFIG_CEPH_FS_POSIX_ACL
472 if (fsopt->sb_flags & MS_POSIXACL)
473 seq_puts(m, ",acl");
474 else
475 seq_puts(m, ",noacl");
476 #endif
477
478 if (fsopt->mds_namespace)
479 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
480 if (fsopt->wsize)
481 seq_printf(m, ",wsize=%d", fsopt->wsize);
482 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
483 seq_printf(m, ",rsize=%d", fsopt->rsize);
484 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
485 seq_printf(m, ",rasize=%d", fsopt->rasize);
486 if (fsopt->congestion_kb != default_congestion_kb())
487 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
488 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
489 seq_printf(m, ",caps_wanted_delay_min=%d",
490 fsopt->caps_wanted_delay_min);
491 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
492 seq_printf(m, ",caps_wanted_delay_max=%d",
493 fsopt->caps_wanted_delay_max);
494 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
495 seq_printf(m, ",cap_release_safety=%d",
496 fsopt->cap_release_safety);
497 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
498 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
499 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
500 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
501 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
502 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
503
504 return 0;
505 }
506
507 /*
508 * handle any mon messages the standard library doesn't understand.
509 * return error if we don't either.
510 */
511 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
512 {
513 struct ceph_fs_client *fsc = client->private;
514 int type = le16_to_cpu(msg->hdr.type);
515
516 switch (type) {
517 case CEPH_MSG_MDS_MAP:
518 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
519 return 0;
520 case CEPH_MSG_FS_MAP_USER:
521 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
522 return 0;
523 default:
524 return -1;
525 }
526 }
527
528 /*
529 * create a new fs client
530 */
531 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
532 struct ceph_options *opt)
533 {
534 struct ceph_fs_client *fsc;
535 const u64 supported_features =
536 CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH |
537 CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA;
538 const u64 required_features = 0;
539 int page_count;
540 size_t size;
541 int err = -ENOMEM;
542
543 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
544 if (!fsc)
545 return ERR_PTR(-ENOMEM);
546
547 fsc->client = ceph_create_client(opt, fsc, supported_features,
548 required_features);
549 if (IS_ERR(fsc->client)) {
550 err = PTR_ERR(fsc->client);
551 goto fail;
552 }
553 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
554
555 if (fsopt->mds_namespace == NULL) {
556 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
557 0, true);
558 } else {
559 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
560 0, false);
561 }
562
563 fsc->mount_options = fsopt;
564
565 fsc->sb = NULL;
566 fsc->mount_state = CEPH_MOUNT_MOUNTING;
567
568 atomic_long_set(&fsc->writeback_count, 0);
569
570 err = bdi_init(&fsc->backing_dev_info);
571 if (err < 0)
572 goto fail_client;
573
574 err = -ENOMEM;
575 /*
576 * The number of concurrent works can be high but they don't need
577 * to be processed in parallel, limit concurrency.
578 */
579 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
580 if (fsc->wb_wq == NULL)
581 goto fail_bdi;
582 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
583 if (fsc->pg_inv_wq == NULL)
584 goto fail_wb_wq;
585 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
586 if (fsc->trunc_wq == NULL)
587 goto fail_pg_inv_wq;
588
589 /* set up mempools */
590 err = -ENOMEM;
591 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
592 size = sizeof (struct page *) * (page_count ? page_count : 1);
593 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
594 if (!fsc->wb_pagevec_pool)
595 goto fail_trunc_wq;
596
597 /* setup fscache */
598 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
599 (ceph_fscache_register_fs(fsc) != 0))
600 goto fail_fscache;
601
602 /* caps */
603 fsc->min_caps = fsopt->max_readdir;
604
605 return fsc;
606
607 fail_fscache:
608 ceph_fscache_unregister_fs(fsc);
609 fail_trunc_wq:
610 destroy_workqueue(fsc->trunc_wq);
611 fail_pg_inv_wq:
612 destroy_workqueue(fsc->pg_inv_wq);
613 fail_wb_wq:
614 destroy_workqueue(fsc->wb_wq);
615 fail_bdi:
616 bdi_destroy(&fsc->backing_dev_info);
617 fail_client:
618 ceph_destroy_client(fsc->client);
619 fail:
620 kfree(fsc);
621 return ERR_PTR(err);
622 }
623
624 static void destroy_fs_client(struct ceph_fs_client *fsc)
625 {
626 dout("destroy_fs_client %p\n", fsc);
627
628 ceph_fscache_unregister_fs(fsc);
629
630 destroy_workqueue(fsc->wb_wq);
631 destroy_workqueue(fsc->pg_inv_wq);
632 destroy_workqueue(fsc->trunc_wq);
633
634 bdi_destroy(&fsc->backing_dev_info);
635
636 mempool_destroy(fsc->wb_pagevec_pool);
637
638 destroy_mount_options(fsc->mount_options);
639
640 ceph_fs_debugfs_cleanup(fsc);
641
642 ceph_destroy_client(fsc->client);
643
644 kfree(fsc);
645 dout("destroy_fs_client %p done\n", fsc);
646 }
647
648 /*
649 * caches
650 */
651 struct kmem_cache *ceph_inode_cachep;
652 struct kmem_cache *ceph_cap_cachep;
653 struct kmem_cache *ceph_cap_flush_cachep;
654 struct kmem_cache *ceph_dentry_cachep;
655 struct kmem_cache *ceph_file_cachep;
656
657 static void ceph_inode_init_once(void *foo)
658 {
659 struct ceph_inode_info *ci = foo;
660 inode_init_once(&ci->vfs_inode);
661 }
662
663 static int __init init_caches(void)
664 {
665 int error = -ENOMEM;
666
667 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
668 sizeof(struct ceph_inode_info),
669 __alignof__(struct ceph_inode_info),
670 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
671 SLAB_ACCOUNT, ceph_inode_init_once);
672 if (ceph_inode_cachep == NULL)
673 return -ENOMEM;
674
675 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
676 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
677 if (ceph_cap_cachep == NULL)
678 goto bad_cap;
679 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
680 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
681 if (ceph_cap_flush_cachep == NULL)
682 goto bad_cap_flush;
683
684 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
685 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
686 if (ceph_dentry_cachep == NULL)
687 goto bad_dentry;
688
689 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
690
691 if (ceph_file_cachep == NULL)
692 goto bad_file;
693
694 if ((error = ceph_fscache_register()))
695 goto bad_file;
696
697 return 0;
698 bad_file:
699 kmem_cache_destroy(ceph_dentry_cachep);
700 bad_dentry:
701 kmem_cache_destroy(ceph_cap_flush_cachep);
702 bad_cap_flush:
703 kmem_cache_destroy(ceph_cap_cachep);
704 bad_cap:
705 kmem_cache_destroy(ceph_inode_cachep);
706 return error;
707 }
708
709 static void destroy_caches(void)
710 {
711 /*
712 * Make sure all delayed rcu free inodes are flushed before we
713 * destroy cache.
714 */
715 rcu_barrier();
716
717 kmem_cache_destroy(ceph_inode_cachep);
718 kmem_cache_destroy(ceph_cap_cachep);
719 kmem_cache_destroy(ceph_cap_flush_cachep);
720 kmem_cache_destroy(ceph_dentry_cachep);
721 kmem_cache_destroy(ceph_file_cachep);
722
723 ceph_fscache_unregister();
724 }
725
726
727 /*
728 * ceph_umount_begin - initiate forced umount. Tear down down the
729 * mount, skipping steps that may hang while waiting for server(s).
730 */
731 static void ceph_umount_begin(struct super_block *sb)
732 {
733 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
734
735 dout("ceph_umount_begin - starting forced umount\n");
736 if (!fsc)
737 return;
738 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
739 ceph_mdsc_force_umount(fsc->mdsc);
740 return;
741 }
742
743 static const struct super_operations ceph_super_ops = {
744 .alloc_inode = ceph_alloc_inode,
745 .destroy_inode = ceph_destroy_inode,
746 .write_inode = ceph_write_inode,
747 .drop_inode = ceph_drop_inode,
748 .evict_inode = ceph_evict_inode,
749 .sync_fs = ceph_sync_fs,
750 .put_super = ceph_put_super,
751 .show_options = ceph_show_options,
752 .statfs = ceph_statfs,
753 .umount_begin = ceph_umount_begin,
754 };
755
756 /*
757 * Bootstrap mount by opening the root directory. Note the mount
758 * @started time from caller, and time out if this takes too long.
759 */
760 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
761 const char *path,
762 unsigned long started)
763 {
764 struct ceph_mds_client *mdsc = fsc->mdsc;
765 struct ceph_mds_request *req = NULL;
766 int err;
767 struct dentry *root;
768
769 /* open dir */
770 dout("open_root_inode opening '%s'\n", path);
771 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
772 if (IS_ERR(req))
773 return ERR_CAST(req);
774 req->r_path1 = kstrdup(path, GFP_NOFS);
775 if (!req->r_path1) {
776 root = ERR_PTR(-ENOMEM);
777 goto out;
778 }
779
780 req->r_ino1.ino = CEPH_INO_ROOT;
781 req->r_ino1.snap = CEPH_NOSNAP;
782 req->r_started = started;
783 req->r_timeout = fsc->client->options->mount_timeout;
784 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
785 req->r_num_caps = 2;
786 err = ceph_mdsc_do_request(mdsc, NULL, req);
787 if (err == 0) {
788 struct inode *inode = req->r_target_inode;
789 req->r_target_inode = NULL;
790 dout("open_root_inode success\n");
791 if (ceph_ino(inode) == CEPH_INO_ROOT &&
792 fsc->sb->s_root == NULL) {
793 root = d_make_root(inode);
794 if (!root) {
795 root = ERR_PTR(-ENOMEM);
796 goto out;
797 }
798 } else {
799 root = d_obtain_root(inode);
800 }
801 ceph_init_dentry(root);
802 dout("open_root_inode success, root dentry is %p\n", root);
803 } else {
804 root = ERR_PTR(err);
805 }
806 out:
807 ceph_mdsc_put_request(req);
808 return root;
809 }
810
811
812
813
814 /*
815 * mount: join the ceph cluster, and open root directory.
816 */
817 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
818 {
819 int err;
820 unsigned long started = jiffies; /* note the start time */
821 struct dentry *root;
822 int first = 0; /* first vfsmount for this super_block */
823
824 dout("mount start %p\n", fsc);
825 mutex_lock(&fsc->client->mount_mutex);
826
827 if (!fsc->sb->s_root) {
828 err = __ceph_open_session(fsc->client, started);
829 if (err < 0)
830 goto out;
831
832 dout("mount opening root\n");
833 root = open_root_dentry(fsc, "", started);
834 if (IS_ERR(root)) {
835 err = PTR_ERR(root);
836 goto out;
837 }
838 fsc->sb->s_root = root;
839 first = 1;
840
841 err = ceph_fs_debugfs_init(fsc);
842 if (err < 0)
843 goto fail;
844 }
845
846 if (!fsc->mount_options->server_path) {
847 root = fsc->sb->s_root;
848 dget(root);
849 } else {
850 const char *path = fsc->mount_options->server_path + 1;
851 dout("mount opening path %s\n", path);
852 root = open_root_dentry(fsc, path, started);
853 if (IS_ERR(root)) {
854 err = PTR_ERR(root);
855 goto fail;
856 }
857 }
858
859 fsc->mount_state = CEPH_MOUNT_MOUNTED;
860 dout("mount success\n");
861 mutex_unlock(&fsc->client->mount_mutex);
862 return root;
863
864 fail:
865 if (first) {
866 dput(fsc->sb->s_root);
867 fsc->sb->s_root = NULL;
868 }
869 out:
870 mutex_unlock(&fsc->client->mount_mutex);
871 return ERR_PTR(err);
872 }
873
874 static int ceph_set_super(struct super_block *s, void *data)
875 {
876 struct ceph_fs_client *fsc = data;
877 int ret;
878
879 dout("set_super %p data %p\n", s, data);
880
881 s->s_flags = fsc->mount_options->sb_flags;
882 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
883
884 s->s_xattr = ceph_xattr_handlers;
885 s->s_fs_info = fsc;
886 fsc->sb = s;
887
888 s->s_op = &ceph_super_ops;
889 s->s_export_op = &ceph_export_ops;
890
891 s->s_time_gran = 1000; /* 1000 ns == 1 us */
892
893 ret = set_anon_super(s, NULL); /* what is that second arg for? */
894 if (ret != 0)
895 goto fail;
896
897 return ret;
898
899 fail:
900 s->s_fs_info = NULL;
901 fsc->sb = NULL;
902 return ret;
903 }
904
905 /*
906 * share superblock if same fs AND options
907 */
908 static int ceph_compare_super(struct super_block *sb, void *data)
909 {
910 struct ceph_fs_client *new = data;
911 struct ceph_mount_options *fsopt = new->mount_options;
912 struct ceph_options *opt = new->client->options;
913 struct ceph_fs_client *other = ceph_sb_to_client(sb);
914
915 dout("ceph_compare_super %p\n", sb);
916
917 if (compare_mount_options(fsopt, opt, other)) {
918 dout("monitor(s)/mount options don't match\n");
919 return 0;
920 }
921 if ((opt->flags & CEPH_OPT_FSID) &&
922 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
923 dout("fsid doesn't match\n");
924 return 0;
925 }
926 if (fsopt->sb_flags != other->mount_options->sb_flags) {
927 dout("flags differ\n");
928 return 0;
929 }
930 return 1;
931 }
932
933 /*
934 * construct our own bdi so we can control readahead, etc.
935 */
936 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
937
938 static int ceph_register_bdi(struct super_block *sb,
939 struct ceph_fs_client *fsc)
940 {
941 int err;
942
943 /* set ra_pages based on rasize mount option? */
944 if (fsc->mount_options->rasize >= PAGE_SIZE)
945 fsc->backing_dev_info.ra_pages =
946 (fsc->mount_options->rasize + PAGE_SIZE - 1)
947 >> PAGE_SHIFT;
948 else
949 fsc->backing_dev_info.ra_pages =
950 VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
951
952 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
953 atomic_long_inc_return(&bdi_seq));
954 if (!err)
955 sb->s_bdi = &fsc->backing_dev_info;
956 return err;
957 }
958
959 static struct dentry *ceph_mount(struct file_system_type *fs_type,
960 int flags, const char *dev_name, void *data)
961 {
962 struct super_block *sb;
963 struct ceph_fs_client *fsc;
964 struct dentry *res;
965 int err;
966 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
967 struct ceph_mount_options *fsopt = NULL;
968 struct ceph_options *opt = NULL;
969
970 dout("ceph_mount\n");
971
972 #ifdef CONFIG_CEPH_FS_POSIX_ACL
973 flags |= MS_POSIXACL;
974 #endif
975 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
976 if (err < 0) {
977 res = ERR_PTR(err);
978 goto out_final;
979 }
980
981 /* create client (which we may/may not use) */
982 fsc = create_fs_client(fsopt, opt);
983 if (IS_ERR(fsc)) {
984 res = ERR_CAST(fsc);
985 destroy_mount_options(fsopt);
986 ceph_destroy_options(opt);
987 goto out_final;
988 }
989
990 err = ceph_mdsc_init(fsc);
991 if (err < 0) {
992 res = ERR_PTR(err);
993 goto out;
994 }
995
996 if (ceph_test_opt(fsc->client, NOSHARE))
997 compare_super = NULL;
998 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
999 if (IS_ERR(sb)) {
1000 res = ERR_CAST(sb);
1001 goto out;
1002 }
1003
1004 if (ceph_sb_to_client(sb) != fsc) {
1005 ceph_mdsc_destroy(fsc);
1006 destroy_fs_client(fsc);
1007 fsc = ceph_sb_to_client(sb);
1008 dout("get_sb got existing client %p\n", fsc);
1009 } else {
1010 dout("get_sb using new client %p\n", fsc);
1011 err = ceph_register_bdi(sb, fsc);
1012 if (err < 0) {
1013 res = ERR_PTR(err);
1014 goto out_splat;
1015 }
1016 }
1017
1018 res = ceph_real_mount(fsc);
1019 if (IS_ERR(res))
1020 goto out_splat;
1021 dout("root %p inode %p ino %llx.%llx\n", res,
1022 d_inode(res), ceph_vinop(d_inode(res)));
1023 return res;
1024
1025 out_splat:
1026 ceph_mdsc_close_sessions(fsc->mdsc);
1027 deactivate_locked_super(sb);
1028 goto out_final;
1029
1030 out:
1031 ceph_mdsc_destroy(fsc);
1032 destroy_fs_client(fsc);
1033 out_final:
1034 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1035 return res;
1036 }
1037
1038 static void ceph_kill_sb(struct super_block *s)
1039 {
1040 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1041 dev_t dev = s->s_dev;
1042
1043 dout("kill_sb %p\n", s);
1044
1045 ceph_mdsc_pre_umount(fsc->mdsc);
1046 generic_shutdown_super(s);
1047 ceph_mdsc_destroy(fsc);
1048
1049 destroy_fs_client(fsc);
1050 free_anon_bdev(dev);
1051 }
1052
1053 static struct file_system_type ceph_fs_type = {
1054 .owner = THIS_MODULE,
1055 .name = "ceph",
1056 .mount = ceph_mount,
1057 .kill_sb = ceph_kill_sb,
1058 .fs_flags = FS_RENAME_DOES_D_MOVE,
1059 };
1060 MODULE_ALIAS_FS("ceph");
1061
1062 static int __init init_ceph(void)
1063 {
1064 int ret = init_caches();
1065 if (ret)
1066 goto out;
1067
1068 ceph_flock_init();
1069 ceph_xattr_init();
1070 ret = register_filesystem(&ceph_fs_type);
1071 if (ret)
1072 goto out_xattr;
1073
1074 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1075
1076 return 0;
1077
1078 out_xattr:
1079 ceph_xattr_exit();
1080 destroy_caches();
1081 out:
1082 return ret;
1083 }
1084
1085 static void __exit exit_ceph(void)
1086 {
1087 dout("exit_ceph\n");
1088 unregister_filesystem(&ceph_fs_type);
1089 ceph_xattr_exit();
1090 destroy_caches();
1091 }
1092
1093 module_init(init_ceph);
1094 module_exit(exit_ceph);
1095
1096 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1097 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1098 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1099 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1100 MODULE_LICENSE("GPL");
Linux with added FPC-III support