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ceph: let path portion of mount "device" be optional
[deliverable/linux.git] / fs / ceph / super.c
1
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/backing-dev.h>
5 #include <linux/ctype.h>
6 #include <linux/fs.h>
7 #include <linux/inet.h>
8 #include <linux/in6.h>
9 #include <linux/module.h>
10 #include <linux/mount.h>
11 #include <linux/parser.h>
12 #include <linux/sched.h>
13 #include <linux/seq_file.h>
14 #include <linux/slab.h>
15 #include <linux/statfs.h>
16 #include <linux/string.h>
17
18 #include "super.h"
19 #include "mds_client.h"
20
21 #include <linux/ceph/ceph_features.h>
22 #include <linux/ceph/decode.h>
23 #include <linux/ceph/mon_client.h>
24 #include <linux/ceph/auth.h>
25 #include <linux/ceph/debugfs.h>
26
27 /*
28 * Ceph superblock operations
29 *
30 * Handle the basics of mounting, unmounting.
31 */
32
33 /*
34 * super ops
35 */
36 static void ceph_put_super(struct super_block *s)
37 {
38 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
39
40 dout("put_super\n");
41 ceph_mdsc_close_sessions(fsc->mdsc);
42
43 /*
44 * ensure we release the bdi before put_anon_super releases
45 * the device name.
46 */
47 if (s->s_bdi == &fsc->backing_dev_info) {
48 bdi_unregister(&fsc->backing_dev_info);
49 s->s_bdi = NULL;
50 }
51
52 return;
53 }
54
55 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
56 {
57 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
58 struct ceph_monmap *monmap = fsc->client->monc.monmap;
59 struct ceph_statfs st;
60 u64 fsid;
61 int err;
62
63 dout("statfs\n");
64 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
65 if (err < 0)
66 return err;
67
68 /* fill in kstatfs */
69 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
70
71 /*
72 * express utilization in terms of large blocks to avoid
73 * overflow on 32-bit machines.
74 */
75 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
76 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
77 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
78 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
79
80 buf->f_files = le64_to_cpu(st.num_objects);
81 buf->f_ffree = -1;
82 buf->f_namelen = NAME_MAX;
83 buf->f_frsize = PAGE_CACHE_SIZE;
84
85 /* leave fsid little-endian, regardless of host endianness */
86 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
87 buf->f_fsid.val[0] = fsid & 0xffffffff;
88 buf->f_fsid.val[1] = fsid >> 32;
89
90 return 0;
91 }
92
93
94 static int ceph_sync_fs(struct super_block *sb, int wait)
95 {
96 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
97
98 if (!wait) {
99 dout("sync_fs (non-blocking)\n");
100 ceph_flush_dirty_caps(fsc->mdsc);
101 dout("sync_fs (non-blocking) done\n");
102 return 0;
103 }
104
105 dout("sync_fs (blocking)\n");
106 ceph_osdc_sync(&fsc->client->osdc);
107 ceph_mdsc_sync(fsc->mdsc);
108 dout("sync_fs (blocking) done\n");
109 return 0;
110 }
111
112 /*
113 * mount options
114 */
115 enum {
116 Opt_wsize,
117 Opt_rsize,
118 Opt_rasize,
119 Opt_caps_wanted_delay_min,
120 Opt_caps_wanted_delay_max,
121 Opt_cap_release_safety,
122 Opt_readdir_max_entries,
123 Opt_readdir_max_bytes,
124 Opt_congestion_kb,
125 Opt_last_int,
126 /* int args above */
127 Opt_snapdirname,
128 Opt_last_string,
129 /* string args above */
130 Opt_dirstat,
131 Opt_nodirstat,
132 Opt_rbytes,
133 Opt_norbytes,
134 Opt_asyncreaddir,
135 Opt_noasyncreaddir,
136 Opt_dcache,
137 Opt_nodcache,
138 Opt_ino32,
139 Opt_noino32,
140 };
141
142 static match_table_t fsopt_tokens = {
143 {Opt_wsize, "wsize=%d"},
144 {Opt_rsize, "rsize=%d"},
145 {Opt_rasize, "rasize=%d"},
146 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
147 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
148 {Opt_cap_release_safety, "cap_release_safety=%d"},
149 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
150 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
151 {Opt_congestion_kb, "write_congestion_kb=%d"},
152 /* int args above */
153 {Opt_snapdirname, "snapdirname=%s"},
154 /* string args above */
155 {Opt_dirstat, "dirstat"},
156 {Opt_nodirstat, "nodirstat"},
157 {Opt_rbytes, "rbytes"},
158 {Opt_norbytes, "norbytes"},
159 {Opt_asyncreaddir, "asyncreaddir"},
160 {Opt_noasyncreaddir, "noasyncreaddir"},
161 {Opt_dcache, "dcache"},
162 {Opt_nodcache, "nodcache"},
163 {Opt_ino32, "ino32"},
164 {Opt_noino32, "noino32"},
165 {-1, NULL}
166 };
167
168 static int parse_fsopt_token(char *c, void *private)
169 {
170 struct ceph_mount_options *fsopt = private;
171 substring_t argstr[MAX_OPT_ARGS];
172 int token, intval, ret;
173
174 token = match_token((char *)c, fsopt_tokens, argstr);
175 if (token < 0)
176 return -EINVAL;
177
178 if (token < Opt_last_int) {
179 ret = match_int(&argstr[0], &intval);
180 if (ret < 0) {
181 pr_err("bad mount option arg (not int) "
182 "at '%s'\n", c);
183 return ret;
184 }
185 dout("got int token %d val %d\n", token, intval);
186 } else if (token > Opt_last_int && token < Opt_last_string) {
187 dout("got string token %d val %s\n", token,
188 argstr[0].from);
189 } else {
190 dout("got token %d\n", token);
191 }
192
193 switch (token) {
194 case Opt_snapdirname:
195 kfree(fsopt->snapdir_name);
196 fsopt->snapdir_name = kstrndup(argstr[0].from,
197 argstr[0].to-argstr[0].from,
198 GFP_KERNEL);
199 if (!fsopt->snapdir_name)
200 return -ENOMEM;
201 break;
202
203 /* misc */
204 case Opt_wsize:
205 fsopt->wsize = intval;
206 break;
207 case Opt_rsize:
208 fsopt->rsize = intval;
209 break;
210 case Opt_rasize:
211 fsopt->rasize = intval;
212 break;
213 case Opt_caps_wanted_delay_min:
214 fsopt->caps_wanted_delay_min = intval;
215 break;
216 case Opt_caps_wanted_delay_max:
217 fsopt->caps_wanted_delay_max = intval;
218 break;
219 case Opt_readdir_max_entries:
220 fsopt->max_readdir = intval;
221 break;
222 case Opt_readdir_max_bytes:
223 fsopt->max_readdir_bytes = intval;
224 break;
225 case Opt_congestion_kb:
226 fsopt->congestion_kb = intval;
227 break;
228 case Opt_dirstat:
229 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
230 break;
231 case Opt_nodirstat:
232 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
233 break;
234 case Opt_rbytes:
235 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
236 break;
237 case Opt_norbytes:
238 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
239 break;
240 case Opt_asyncreaddir:
241 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
242 break;
243 case Opt_noasyncreaddir:
244 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
245 break;
246 case Opt_dcache:
247 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
248 break;
249 case Opt_nodcache:
250 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
251 break;
252 case Opt_ino32:
253 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
254 break;
255 case Opt_noino32:
256 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
257 break;
258 default:
259 BUG_ON(token);
260 }
261 return 0;
262 }
263
264 static void destroy_mount_options(struct ceph_mount_options *args)
265 {
266 dout("destroy_mount_options %p\n", args);
267 kfree(args->snapdir_name);
268 kfree(args);
269 }
270
271 static int strcmp_null(const char *s1, const char *s2)
272 {
273 if (!s1 && !s2)
274 return 0;
275 if (s1 && !s2)
276 return -1;
277 if (!s1 && s2)
278 return 1;
279 return strcmp(s1, s2);
280 }
281
282 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
283 struct ceph_options *new_opt,
284 struct ceph_fs_client *fsc)
285 {
286 struct ceph_mount_options *fsopt1 = new_fsopt;
287 struct ceph_mount_options *fsopt2 = fsc->mount_options;
288 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
289 int ret;
290
291 ret = memcmp(fsopt1, fsopt2, ofs);
292 if (ret)
293 return ret;
294
295 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
296 if (ret)
297 return ret;
298
299 return ceph_compare_options(new_opt, fsc->client);
300 }
301
302 static int parse_mount_options(struct ceph_mount_options **pfsopt,
303 struct ceph_options **popt,
304 int flags, char *options,
305 const char *dev_name,
306 const char **path)
307 {
308 struct ceph_mount_options *fsopt;
309 const char *dev_name_end;
310 int err;
311
312 if (!dev_name || !*dev_name)
313 return -EINVAL;
314
315 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
316 if (!fsopt)
317 return -ENOMEM;
318
319 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
320
321 fsopt->sb_flags = flags;
322 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
323
324 fsopt->rsize = CEPH_RSIZE_DEFAULT;
325 fsopt->rasize = CEPH_RASIZE_DEFAULT;
326 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
327 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
328 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
329 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
330 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
331 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
332 fsopt->congestion_kb = default_congestion_kb();
333
334 /*
335 * Distinguish the server list from the path in "dev_name".
336 * Internally we do not include the leading '/' in the path.
337 *
338 * "dev_name" will look like:
339 * <server_spec>[,<server_spec>...]:[<path>]
340 * where
341 * <server_spec> is <ip>[:<port>]
342 * <path> is optional, but if present must begin with '/'
343 */
344 dev_name_end = strchr(dev_name, '/');
345 if (dev_name_end) {
346 /* skip over leading '/' for path */
347 *path = dev_name_end + 1;
348 } else {
349 /* path is empty */
350 dev_name_end = dev_name + strlen(dev_name);
351 *path = dev_name_end;
352 }
353 err = -EINVAL;
354 dev_name_end--; /* back up to ':' separator */
355 if (*dev_name_end != ':') {
356 pr_err("device name is missing path (no : separator in %s)\n",
357 dev_name);
358 goto out;
359 }
360 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
361 dout("server path '%s'\n", *path);
362
363 *popt = ceph_parse_options(options, dev_name, dev_name_end,
364 parse_fsopt_token, (void *)fsopt);
365 if (IS_ERR(*popt)) {
366 err = PTR_ERR(*popt);
367 goto out;
368 }
369
370 /* success */
371 *pfsopt = fsopt;
372 return 0;
373
374 out:
375 destroy_mount_options(fsopt);
376 return err;
377 }
378
379 /**
380 * ceph_show_options - Show mount options in /proc/mounts
381 * @m: seq_file to write to
382 * @root: root of that (sub)tree
383 */
384 static int ceph_show_options(struct seq_file *m, struct dentry *root)
385 {
386 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
387 struct ceph_mount_options *fsopt = fsc->mount_options;
388 struct ceph_options *opt = fsc->client->options;
389
390 if (opt->flags & CEPH_OPT_FSID)
391 seq_printf(m, ",fsid=%pU", &opt->fsid);
392 if (opt->flags & CEPH_OPT_NOSHARE)
393 seq_puts(m, ",noshare");
394 if (opt->flags & CEPH_OPT_NOCRC)
395 seq_puts(m, ",nocrc");
396
397 if (opt->name)
398 seq_printf(m, ",name=%s", opt->name);
399 if (opt->key)
400 seq_puts(m, ",secret=<hidden>");
401
402 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
403 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
404 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
405 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
406 if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
407 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout);
408 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
409 seq_printf(m, ",osdkeepalivetimeout=%d",
410 opt->osd_keepalive_timeout);
411
412 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
413 seq_puts(m, ",dirstat");
414 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
415 seq_puts(m, ",norbytes");
416 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
417 seq_puts(m, ",noasyncreaddir");
418 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
419 seq_puts(m, ",dcache");
420 else
421 seq_puts(m, ",nodcache");
422
423 if (fsopt->wsize)
424 seq_printf(m, ",wsize=%d", fsopt->wsize);
425 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
426 seq_printf(m, ",rsize=%d", fsopt->rsize);
427 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
428 seq_printf(m, ",rasize=%d", fsopt->rasize);
429 if (fsopt->congestion_kb != default_congestion_kb())
430 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
431 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
432 seq_printf(m, ",caps_wanted_delay_min=%d",
433 fsopt->caps_wanted_delay_min);
434 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
435 seq_printf(m, ",caps_wanted_delay_max=%d",
436 fsopt->caps_wanted_delay_max);
437 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
438 seq_printf(m, ",cap_release_safety=%d",
439 fsopt->cap_release_safety);
440 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
441 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
442 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
443 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
444 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
445 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
446 return 0;
447 }
448
449 /*
450 * handle any mon messages the standard library doesn't understand.
451 * return error if we don't either.
452 */
453 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
454 {
455 struct ceph_fs_client *fsc = client->private;
456 int type = le16_to_cpu(msg->hdr.type);
457
458 switch (type) {
459 case CEPH_MSG_MDS_MAP:
460 ceph_mdsc_handle_map(fsc->mdsc, msg);
461 return 0;
462
463 default:
464 return -1;
465 }
466 }
467
468 /*
469 * create a new fs client
470 */
471 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
472 struct ceph_options *opt)
473 {
474 struct ceph_fs_client *fsc;
475 const unsigned supported_features =
476 CEPH_FEATURE_FLOCK |
477 CEPH_FEATURE_DIRLAYOUTHASH;
478 const unsigned required_features = 0;
479 int err = -ENOMEM;
480
481 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
482 if (!fsc)
483 return ERR_PTR(-ENOMEM);
484
485 fsc->client = ceph_create_client(opt, fsc, supported_features,
486 required_features);
487 if (IS_ERR(fsc->client)) {
488 err = PTR_ERR(fsc->client);
489 goto fail;
490 }
491 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
492 fsc->client->monc.want_mdsmap = 1;
493
494 fsc->mount_options = fsopt;
495
496 fsc->sb = NULL;
497 fsc->mount_state = CEPH_MOUNT_MOUNTING;
498
499 atomic_long_set(&fsc->writeback_count, 0);
500
501 err = bdi_init(&fsc->backing_dev_info);
502 if (err < 0)
503 goto fail_client;
504
505 err = -ENOMEM;
506 /*
507 * The number of concurrent works can be high but they don't need
508 * to be processed in parallel, limit concurrency.
509 */
510 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
511 if (fsc->wb_wq == NULL)
512 goto fail_bdi;
513 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
514 if (fsc->pg_inv_wq == NULL)
515 goto fail_wb_wq;
516 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
517 if (fsc->trunc_wq == NULL)
518 goto fail_pg_inv_wq;
519
520 /* set up mempools */
521 err = -ENOMEM;
522 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
523 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
524 if (!fsc->wb_pagevec_pool)
525 goto fail_trunc_wq;
526
527 /* caps */
528 fsc->min_caps = fsopt->max_readdir;
529
530 return fsc;
531
532 fail_trunc_wq:
533 destroy_workqueue(fsc->trunc_wq);
534 fail_pg_inv_wq:
535 destroy_workqueue(fsc->pg_inv_wq);
536 fail_wb_wq:
537 destroy_workqueue(fsc->wb_wq);
538 fail_bdi:
539 bdi_destroy(&fsc->backing_dev_info);
540 fail_client:
541 ceph_destroy_client(fsc->client);
542 fail:
543 kfree(fsc);
544 return ERR_PTR(err);
545 }
546
547 static void destroy_fs_client(struct ceph_fs_client *fsc)
548 {
549 dout("destroy_fs_client %p\n", fsc);
550
551 destroy_workqueue(fsc->wb_wq);
552 destroy_workqueue(fsc->pg_inv_wq);
553 destroy_workqueue(fsc->trunc_wq);
554
555 bdi_destroy(&fsc->backing_dev_info);
556
557 mempool_destroy(fsc->wb_pagevec_pool);
558
559 destroy_mount_options(fsc->mount_options);
560
561 ceph_fs_debugfs_cleanup(fsc);
562
563 ceph_destroy_client(fsc->client);
564
565 kfree(fsc);
566 dout("destroy_fs_client %p done\n", fsc);
567 }
568
569 /*
570 * caches
571 */
572 struct kmem_cache *ceph_inode_cachep;
573 struct kmem_cache *ceph_cap_cachep;
574 struct kmem_cache *ceph_dentry_cachep;
575 struct kmem_cache *ceph_file_cachep;
576
577 static void ceph_inode_init_once(void *foo)
578 {
579 struct ceph_inode_info *ci = foo;
580 inode_init_once(&ci->vfs_inode);
581 }
582
583 static int __init init_caches(void)
584 {
585 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
586 sizeof(struct ceph_inode_info),
587 __alignof__(struct ceph_inode_info),
588 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
589 ceph_inode_init_once);
590 if (ceph_inode_cachep == NULL)
591 return -ENOMEM;
592
593 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
594 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
595 if (ceph_cap_cachep == NULL)
596 goto bad_cap;
597
598 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
599 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
600 if (ceph_dentry_cachep == NULL)
601 goto bad_dentry;
602
603 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
604 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
605 if (ceph_file_cachep == NULL)
606 goto bad_file;
607
608 return 0;
609
610 bad_file:
611 kmem_cache_destroy(ceph_dentry_cachep);
612 bad_dentry:
613 kmem_cache_destroy(ceph_cap_cachep);
614 bad_cap:
615 kmem_cache_destroy(ceph_inode_cachep);
616 return -ENOMEM;
617 }
618
619 static void destroy_caches(void)
620 {
621 kmem_cache_destroy(ceph_inode_cachep);
622 kmem_cache_destroy(ceph_cap_cachep);
623 kmem_cache_destroy(ceph_dentry_cachep);
624 kmem_cache_destroy(ceph_file_cachep);
625 }
626
627
628 /*
629 * ceph_umount_begin - initiate forced umount. Tear down down the
630 * mount, skipping steps that may hang while waiting for server(s).
631 */
632 static void ceph_umount_begin(struct super_block *sb)
633 {
634 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
635
636 dout("ceph_umount_begin - starting forced umount\n");
637 if (!fsc)
638 return;
639 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
640 return;
641 }
642
643 static const struct super_operations ceph_super_ops = {
644 .alloc_inode = ceph_alloc_inode,
645 .destroy_inode = ceph_destroy_inode,
646 .write_inode = ceph_write_inode,
647 .sync_fs = ceph_sync_fs,
648 .put_super = ceph_put_super,
649 .show_options = ceph_show_options,
650 .statfs = ceph_statfs,
651 .umount_begin = ceph_umount_begin,
652 };
653
654 /*
655 * Bootstrap mount by opening the root directory. Note the mount
656 * @started time from caller, and time out if this takes too long.
657 */
658 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
659 const char *path,
660 unsigned long started)
661 {
662 struct ceph_mds_client *mdsc = fsc->mdsc;
663 struct ceph_mds_request *req = NULL;
664 int err;
665 struct dentry *root;
666
667 /* open dir */
668 dout("open_root_inode opening '%s'\n", path);
669 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
670 if (IS_ERR(req))
671 return ERR_CAST(req);
672 req->r_path1 = kstrdup(path, GFP_NOFS);
673 req->r_ino1.ino = CEPH_INO_ROOT;
674 req->r_ino1.snap = CEPH_NOSNAP;
675 req->r_started = started;
676 req->r_timeout = fsc->client->options->mount_timeout * HZ;
677 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
678 req->r_num_caps = 2;
679 err = ceph_mdsc_do_request(mdsc, NULL, req);
680 if (err == 0) {
681 struct inode *inode = req->r_target_inode;
682 req->r_target_inode = NULL;
683 dout("open_root_inode success\n");
684 if (ceph_ino(inode) == CEPH_INO_ROOT &&
685 fsc->sb->s_root == NULL) {
686 root = d_make_root(inode);
687 if (!root) {
688 root = ERR_PTR(-ENOMEM);
689 goto out;
690 }
691 } else {
692 root = d_obtain_alias(inode);
693 }
694 ceph_init_dentry(root);
695 dout("open_root_inode success, root dentry is %p\n", root);
696 } else {
697 root = ERR_PTR(err);
698 }
699 out:
700 ceph_mdsc_put_request(req);
701 return root;
702 }
703
704
705
706
707 /*
708 * mount: join the ceph cluster, and open root directory.
709 */
710 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
711 const char *path)
712 {
713 int err;
714 unsigned long started = jiffies; /* note the start time */
715 struct dentry *root;
716 int first = 0; /* first vfsmount for this super_block */
717
718 dout("mount start\n");
719 mutex_lock(&fsc->client->mount_mutex);
720
721 err = __ceph_open_session(fsc->client, started);
722 if (err < 0)
723 goto out;
724
725 dout("mount opening root\n");
726 root = open_root_dentry(fsc, "", started);
727 if (IS_ERR(root)) {
728 err = PTR_ERR(root);
729 goto out;
730 }
731 if (fsc->sb->s_root) {
732 dput(root);
733 } else {
734 fsc->sb->s_root = root;
735 first = 1;
736
737 err = ceph_fs_debugfs_init(fsc);
738 if (err < 0)
739 goto fail;
740 }
741
742 if (path[0] == 0) {
743 dget(root);
744 } else {
745 dout("mount opening base mountpoint\n");
746 root = open_root_dentry(fsc, path, started);
747 if (IS_ERR(root)) {
748 err = PTR_ERR(root);
749 goto fail;
750 }
751 }
752
753 fsc->mount_state = CEPH_MOUNT_MOUNTED;
754 dout("mount success\n");
755 mutex_unlock(&fsc->client->mount_mutex);
756 return root;
757
758 out:
759 mutex_unlock(&fsc->client->mount_mutex);
760 return ERR_PTR(err);
761
762 fail:
763 if (first) {
764 dput(fsc->sb->s_root);
765 fsc->sb->s_root = NULL;
766 }
767 goto out;
768 }
769
770 static int ceph_set_super(struct super_block *s, void *data)
771 {
772 struct ceph_fs_client *fsc = data;
773 int ret;
774
775 dout("set_super %p data %p\n", s, data);
776
777 s->s_flags = fsc->mount_options->sb_flags;
778 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
779
780 s->s_fs_info = fsc;
781 fsc->sb = s;
782
783 s->s_op = &ceph_super_ops;
784 s->s_export_op = &ceph_export_ops;
785
786 s->s_time_gran = 1000; /* 1000 ns == 1 us */
787
788 ret = set_anon_super(s, NULL); /* what is that second arg for? */
789 if (ret != 0)
790 goto fail;
791
792 return ret;
793
794 fail:
795 s->s_fs_info = NULL;
796 fsc->sb = NULL;
797 return ret;
798 }
799
800 /*
801 * share superblock if same fs AND options
802 */
803 static int ceph_compare_super(struct super_block *sb, void *data)
804 {
805 struct ceph_fs_client *new = data;
806 struct ceph_mount_options *fsopt = new->mount_options;
807 struct ceph_options *opt = new->client->options;
808 struct ceph_fs_client *other = ceph_sb_to_client(sb);
809
810 dout("ceph_compare_super %p\n", sb);
811
812 if (compare_mount_options(fsopt, opt, other)) {
813 dout("monitor(s)/mount options don't match\n");
814 return 0;
815 }
816 if ((opt->flags & CEPH_OPT_FSID) &&
817 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
818 dout("fsid doesn't match\n");
819 return 0;
820 }
821 if (fsopt->sb_flags != other->mount_options->sb_flags) {
822 dout("flags differ\n");
823 return 0;
824 }
825 return 1;
826 }
827
828 /*
829 * construct our own bdi so we can control readahead, etc.
830 */
831 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
832
833 static int ceph_register_bdi(struct super_block *sb,
834 struct ceph_fs_client *fsc)
835 {
836 int err;
837
838 /* set ra_pages based on rasize mount option? */
839 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
840 fsc->backing_dev_info.ra_pages =
841 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
842 >> PAGE_SHIFT;
843 else
844 fsc->backing_dev_info.ra_pages =
845 default_backing_dev_info.ra_pages;
846
847 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d",
848 atomic_long_inc_return(&bdi_seq));
849 if (!err)
850 sb->s_bdi = &fsc->backing_dev_info;
851 return err;
852 }
853
854 static struct dentry *ceph_mount(struct file_system_type *fs_type,
855 int flags, const char *dev_name, void *data)
856 {
857 struct super_block *sb;
858 struct ceph_fs_client *fsc;
859 struct dentry *res;
860 int err;
861 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
862 const char *path = NULL;
863 struct ceph_mount_options *fsopt = NULL;
864 struct ceph_options *opt = NULL;
865
866 dout("ceph_mount\n");
867 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
868 if (err < 0) {
869 res = ERR_PTR(err);
870 goto out_final;
871 }
872
873 /* create client (which we may/may not use) */
874 fsc = create_fs_client(fsopt, opt);
875 if (IS_ERR(fsc)) {
876 res = ERR_CAST(fsc);
877 destroy_mount_options(fsopt);
878 ceph_destroy_options(opt);
879 goto out_final;
880 }
881
882 err = ceph_mdsc_init(fsc);
883 if (err < 0) {
884 res = ERR_PTR(err);
885 goto out;
886 }
887
888 if (ceph_test_opt(fsc->client, NOSHARE))
889 compare_super = NULL;
890 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
891 if (IS_ERR(sb)) {
892 res = ERR_CAST(sb);
893 goto out;
894 }
895
896 if (ceph_sb_to_client(sb) != fsc) {
897 ceph_mdsc_destroy(fsc);
898 destroy_fs_client(fsc);
899 fsc = ceph_sb_to_client(sb);
900 dout("get_sb got existing client %p\n", fsc);
901 } else {
902 dout("get_sb using new client %p\n", fsc);
903 err = ceph_register_bdi(sb, fsc);
904 if (err < 0) {
905 res = ERR_PTR(err);
906 goto out_splat;
907 }
908 }
909
910 res = ceph_real_mount(fsc, path);
911 if (IS_ERR(res))
912 goto out_splat;
913 dout("root %p inode %p ino %llx.%llx\n", res,
914 res->d_inode, ceph_vinop(res->d_inode));
915 return res;
916
917 out_splat:
918 ceph_mdsc_close_sessions(fsc->mdsc);
919 deactivate_locked_super(sb);
920 goto out_final;
921
922 out:
923 ceph_mdsc_destroy(fsc);
924 destroy_fs_client(fsc);
925 out_final:
926 dout("ceph_mount fail %ld\n", PTR_ERR(res));
927 return res;
928 }
929
930 static void ceph_kill_sb(struct super_block *s)
931 {
932 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
933 dout("kill_sb %p\n", s);
934 ceph_mdsc_pre_umount(fsc->mdsc);
935 kill_anon_super(s); /* will call put_super after sb is r/o */
936 ceph_mdsc_destroy(fsc);
937 destroy_fs_client(fsc);
938 }
939
940 static struct file_system_type ceph_fs_type = {
941 .owner = THIS_MODULE,
942 .name = "ceph",
943 .mount = ceph_mount,
944 .kill_sb = ceph_kill_sb,
945 .fs_flags = FS_RENAME_DOES_D_MOVE,
946 };
947
948 #define _STRINGIFY(x) #x
949 #define STRINGIFY(x) _STRINGIFY(x)
950
951 static int __init init_ceph(void)
952 {
953 int ret = init_caches();
954 if (ret)
955 goto out;
956
957 ceph_xattr_init();
958 ret = register_filesystem(&ceph_fs_type);
959 if (ret)
960 goto out_icache;
961
962 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
963
964 return 0;
965
966 out_icache:
967 ceph_xattr_exit();
968 destroy_caches();
969 out:
970 return ret;
971 }
972
973 static void __exit exit_ceph(void)
974 {
975 dout("exit_ceph\n");
976 unregister_filesystem(&ceph_fs_type);
977 ceph_xattr_exit();
978 destroy_caches();
979 }
980
981 module_init(init_ceph);
982 module_exit(exit_ceph);
983
984 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
985 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
986 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
987 MODULE_DESCRIPTION("Ceph filesystem for Linux");
988 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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