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tuntap: switch to use rtnl_dereference()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ceph / super.c
blobe86aa9948124b3601e1734515e4fb629627855de
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_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
407 seq_printf(m, ",osdkeepalivetimeout=%d",
408 opt->osd_keepalive_timeout);
409
410 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
411 seq_puts(m, ",dirstat");
412 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
413 seq_puts(m, ",norbytes");
414 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
415 seq_puts(m, ",noasyncreaddir");
416 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
417 seq_puts(m, ",dcache");
418 else
419 seq_puts(m, ",nodcache");
420
421 if (fsopt->wsize)
422 seq_printf(m, ",wsize=%d", fsopt->wsize);
423 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
424 seq_printf(m, ",rsize=%d", fsopt->rsize);
425 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
426 seq_printf(m, ",rasize=%d", fsopt->rasize);
427 if (fsopt->congestion_kb != default_congestion_kb())
428 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
429 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
430 seq_printf(m, ",caps_wanted_delay_min=%d",
431 fsopt->caps_wanted_delay_min);
432 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
433 seq_printf(m, ",caps_wanted_delay_max=%d",
434 fsopt->caps_wanted_delay_max);
435 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
436 seq_printf(m, ",cap_release_safety=%d",
437 fsopt->cap_release_safety);
438 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
439 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
440 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
441 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
442 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
443 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
444 return 0;
445 }
446
447 /*
448 * handle any mon messages the standard library doesn't understand.
449 * return error if we don't either.
450 */
451 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
452 {
453 struct ceph_fs_client *fsc = client->private;
454 int type = le16_to_cpu(msg->hdr.type);
455
456 switch (type) {
457 case CEPH_MSG_MDS_MAP:
458 ceph_mdsc_handle_map(fsc->mdsc, msg);
459 return 0;
460
461 default:
462 return -1;
463 }
464 }
465
466 /*
467 * create a new fs client
468 */
469 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
470 struct ceph_options *opt)
471 {
472 struct ceph_fs_client *fsc;
473 const unsigned supported_features =
474 CEPH_FEATURE_FLOCK |
475 CEPH_FEATURE_DIRLAYOUTHASH;
476 const unsigned required_features = 0;
477 int err = -ENOMEM;
478
479 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
480 if (!fsc)
481 return ERR_PTR(-ENOMEM);
482
483 fsc->client = ceph_create_client(opt, fsc, supported_features,
484 required_features);
485 if (IS_ERR(fsc->client)) {
486 err = PTR_ERR(fsc->client);
487 goto fail;
488 }
489 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
490 fsc->client->monc.want_mdsmap = 1;
491
492 fsc->mount_options = fsopt;
493
494 fsc->sb = NULL;
495 fsc->mount_state = CEPH_MOUNT_MOUNTING;
496
497 atomic_long_set(&fsc->writeback_count, 0);
498
499 err = bdi_init(&fsc->backing_dev_info);
500 if (err < 0)
501 goto fail_client;
502
503 err = -ENOMEM;
504 /*
505 * The number of concurrent works can be high but they don't need
506 * to be processed in parallel, limit concurrency.
507 */
508 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
509 if (fsc->wb_wq == NULL)
510 goto fail_bdi;
511 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
512 if (fsc->pg_inv_wq == NULL)
513 goto fail_wb_wq;
514 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
515 if (fsc->trunc_wq == NULL)
516 goto fail_pg_inv_wq;
517
518 /* set up mempools */
519 err = -ENOMEM;
520 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
521 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
522 if (!fsc->wb_pagevec_pool)
523 goto fail_trunc_wq;
524
525 /* caps */
526 fsc->min_caps = fsopt->max_readdir;
527
528 return fsc;
529
530 fail_trunc_wq:
531 destroy_workqueue(fsc->trunc_wq);
532 fail_pg_inv_wq:
533 destroy_workqueue(fsc->pg_inv_wq);
534 fail_wb_wq:
535 destroy_workqueue(fsc->wb_wq);
536 fail_bdi:
537 bdi_destroy(&fsc->backing_dev_info);
538 fail_client:
539 ceph_destroy_client(fsc->client);
540 fail:
541 kfree(fsc);
542 return ERR_PTR(err);
543 }
544
545 static void destroy_fs_client(struct ceph_fs_client *fsc)
546 {
547 dout("destroy_fs_client %p\n", fsc);
548
549 destroy_workqueue(fsc->wb_wq);
550 destroy_workqueue(fsc->pg_inv_wq);
551 destroy_workqueue(fsc->trunc_wq);
552
553 bdi_destroy(&fsc->backing_dev_info);
554
555 mempool_destroy(fsc->wb_pagevec_pool);
556
557 destroy_mount_options(fsc->mount_options);
558
559 ceph_fs_debugfs_cleanup(fsc);
560
561 ceph_destroy_client(fsc->client);
562
563 kfree(fsc);
564 dout("destroy_fs_client %p done\n", fsc);
565 }
566
567 /*
568 * caches
569 */
570 struct kmem_cache *ceph_inode_cachep;
571 struct kmem_cache *ceph_cap_cachep;
572 struct kmem_cache *ceph_dentry_cachep;
573 struct kmem_cache *ceph_file_cachep;
574
575 static void ceph_inode_init_once(void *foo)
576 {
577 struct ceph_inode_info *ci = foo;
578 inode_init_once(&ci->vfs_inode);
579 }
580
581 static int __init init_caches(void)
582 {
583 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
584 sizeof(struct ceph_inode_info),
585 __alignof__(struct ceph_inode_info),
586 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
587 ceph_inode_init_once);
588 if (ceph_inode_cachep == NULL)
589 return -ENOMEM;
590
591 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
592 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
593 if (ceph_cap_cachep == NULL)
594 goto bad_cap;
595
596 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
597 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
598 if (ceph_dentry_cachep == NULL)
599 goto bad_dentry;
600
601 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
602 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
603 if (ceph_file_cachep == NULL)
604 goto bad_file;
605
606 return 0;
607
608 bad_file:
609 kmem_cache_destroy(ceph_dentry_cachep);
610 bad_dentry:
611 kmem_cache_destroy(ceph_cap_cachep);
612 bad_cap:
613 kmem_cache_destroy(ceph_inode_cachep);
614 return -ENOMEM;
615 }
616
617 static void destroy_caches(void)
618 {
619 /*
620 * Make sure all delayed rcu free inodes are flushed before we
621 * destroy cache.
622 */
623 rcu_barrier();
624 kmem_cache_destroy(ceph_inode_cachep);
625 kmem_cache_destroy(ceph_cap_cachep);
626 kmem_cache_destroy(ceph_dentry_cachep);
627 kmem_cache_destroy(ceph_file_cachep);
628 }
629
630
631 /*
632 * ceph_umount_begin - initiate forced umount. Tear down down the
633 * mount, skipping steps that may hang while waiting for server(s).
634 */
635 static void ceph_umount_begin(struct super_block *sb)
636 {
637 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
638
639 dout("ceph_umount_begin - starting forced umount\n");
640 if (!fsc)
641 return;
642 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
643 return;
644 }
645
646 static const struct super_operations ceph_super_ops = {
647 .alloc_inode = ceph_alloc_inode,
648 .destroy_inode = ceph_destroy_inode,
649 .write_inode = ceph_write_inode,
650 .sync_fs = ceph_sync_fs,
651 .put_super = ceph_put_super,
652 .show_options = ceph_show_options,
653 .statfs = ceph_statfs,
654 .umount_begin = ceph_umount_begin,
655 };
656
657 /*
658 * Bootstrap mount by opening the root directory. Note the mount
659 * @started time from caller, and time out if this takes too long.
660 */
661 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
662 const char *path,
663 unsigned long started)
664 {
665 struct ceph_mds_client *mdsc = fsc->mdsc;
666 struct ceph_mds_request *req = NULL;
667 int err;
668 struct dentry *root;
669
670 /* open dir */
671 dout("open_root_inode opening '%s'\n", path);
672 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
673 if (IS_ERR(req))
674 return ERR_CAST(req);
675 req->r_path1 = kstrdup(path, GFP_NOFS);
676 req->r_ino1.ino = CEPH_INO_ROOT;
677 req->r_ino1.snap = CEPH_NOSNAP;
678 req->r_started = started;
679 req->r_timeout = fsc->client->options->mount_timeout * HZ;
680 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
681 req->r_num_caps = 2;
682 err = ceph_mdsc_do_request(mdsc, NULL, req);
683 if (err == 0) {
684 struct inode *inode = req->r_target_inode;
685 req->r_target_inode = NULL;
686 dout("open_root_inode success\n");
687 if (ceph_ino(inode) == CEPH_INO_ROOT &&
688 fsc->sb->s_root == NULL) {
689 root = d_make_root(inode);
690 if (!root) {
691 root = ERR_PTR(-ENOMEM);
692 goto out;
693 }
694 } else {
695 root = d_obtain_alias(inode);
696 }
697 ceph_init_dentry(root);
698 dout("open_root_inode success, root dentry is %p\n", root);
699 } else {
700 root = ERR_PTR(err);
701 }
702 out:
703 ceph_mdsc_put_request(req);
704 return root;
705 }
706
707
708
709
710 /*
711 * mount: join the ceph cluster, and open root directory.
712 */
713 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
714 const char *path)
715 {
716 int err;
717 unsigned long started = jiffies; /* note the start time */
718 struct dentry *root;
719 int first = 0; /* first vfsmount for this super_block */
720
721 dout("mount start\n");
722 mutex_lock(&fsc->client->mount_mutex);
723
724 err = __ceph_open_session(fsc->client, started);
725 if (err < 0)
726 goto out;
727
728 dout("mount opening root\n");
729 root = open_root_dentry(fsc, "", started);
730 if (IS_ERR(root)) {
731 err = PTR_ERR(root);
732 goto out;
733 }
734 if (fsc->sb->s_root) {
735 dput(root);
736 } else {
737 fsc->sb->s_root = root;
738 first = 1;
739
740 err = ceph_fs_debugfs_init(fsc);
741 if (err < 0)
742 goto fail;
743 }
744
745 if (path[0] == 0) {
746 dget(root);
747 } else {
748 dout("mount opening base mountpoint\n");
749 root = open_root_dentry(fsc, path, started);
750 if (IS_ERR(root)) {
751 err = PTR_ERR(root);
752 goto fail;
753 }
754 }
755
756 fsc->mount_state = CEPH_MOUNT_MOUNTED;
757 dout("mount success\n");
758 mutex_unlock(&fsc->client->mount_mutex);
759 return root;
760
761 out:
762 mutex_unlock(&fsc->client->mount_mutex);
763 return ERR_PTR(err);
764
765 fail:
766 if (first) {
767 dput(fsc->sb->s_root);
768 fsc->sb->s_root = NULL;
769 }
770 goto out;
771 }
772
773 static int ceph_set_super(struct super_block *s, void *data)
774 {
775 struct ceph_fs_client *fsc = data;
776 int ret;
777
778 dout("set_super %p data %p\n", s, data);
779
780 s->s_flags = fsc->mount_options->sb_flags;
781 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
782
783 s->s_fs_info = fsc;
784 fsc->sb = s;
785
786 s->s_op = &ceph_super_ops;
787 s->s_export_op = &ceph_export_ops;
788
789 s->s_time_gran = 1000; /* 1000 ns == 1 us */
790
791 ret = set_anon_super(s, NULL); /* what is that second arg for? */
792 if (ret != 0)
793 goto fail;
794
795 return ret;
796
797 fail:
798 s->s_fs_info = NULL;
799 fsc->sb = NULL;
800 return ret;
801 }
802
803 /*
804 * share superblock if same fs AND options
805 */
806 static int ceph_compare_super(struct super_block *sb, void *data)
807 {
808 struct ceph_fs_client *new = data;
809 struct ceph_mount_options *fsopt = new->mount_options;
810 struct ceph_options *opt = new->client->options;
811 struct ceph_fs_client *other = ceph_sb_to_client(sb);
812
813 dout("ceph_compare_super %p\n", sb);
814
815 if (compare_mount_options(fsopt, opt, other)) {
816 dout("monitor(s)/mount options don't match\n");
817 return 0;
818 }
819 if ((opt->flags & CEPH_OPT_FSID) &&
820 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
821 dout("fsid doesn't match\n");
822 return 0;
823 }
824 if (fsopt->sb_flags != other->mount_options->sb_flags) {
825 dout("flags differ\n");
826 return 0;
827 }
828 return 1;
829 }
830
831 /*
832 * construct our own bdi so we can control readahead, etc.
833 */
834 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
835
836 static int ceph_register_bdi(struct super_block *sb,
837 struct ceph_fs_client *fsc)
838 {
839 int err;
840
841 /* set ra_pages based on rasize mount option? */
842 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
843 fsc->backing_dev_info.ra_pages =
844 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
845 >> PAGE_SHIFT;
846 else
847 fsc->backing_dev_info.ra_pages =
848 default_backing_dev_info.ra_pages;
849
850 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
851 atomic_long_inc_return(&bdi_seq));
852 if (!err)
853 sb->s_bdi = &fsc->backing_dev_info;
854 return err;
855 }
856
857 static struct dentry *ceph_mount(struct file_system_type *fs_type,
858 int flags, const char *dev_name, void *data)
859 {
860 struct super_block *sb;
861 struct ceph_fs_client *fsc;
862 struct dentry *res;
863 int err;
864 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
865 const char *path = NULL;
866 struct ceph_mount_options *fsopt = NULL;
867 struct ceph_options *opt = NULL;
868
869 dout("ceph_mount\n");
870 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
871 if (err < 0) {
872 res = ERR_PTR(err);
873 goto out_final;
874 }
875
876 /* create client (which we may/may not use) */
877 fsc = create_fs_client(fsopt, opt);
878 if (IS_ERR(fsc)) {
879 res = ERR_CAST(fsc);
880 destroy_mount_options(fsopt);
881 ceph_destroy_options(opt);
882 goto out_final;
883 }
884
885 err = ceph_mdsc_init(fsc);
886 if (err < 0) {
887 res = ERR_PTR(err);
888 goto out;
889 }
890
891 if (ceph_test_opt(fsc->client, NOSHARE))
892 compare_super = NULL;
893 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
894 if (IS_ERR(sb)) {
895 res = ERR_CAST(sb);
896 goto out;
897 }
898
899 if (ceph_sb_to_client(sb) != fsc) {
900 ceph_mdsc_destroy(fsc);
901 destroy_fs_client(fsc);
902 fsc = ceph_sb_to_client(sb);
903 dout("get_sb got existing client %p\n", fsc);
904 } else {
905 dout("get_sb using new client %p\n", fsc);
906 err = ceph_register_bdi(sb, fsc);
907 if (err < 0) {
908 res = ERR_PTR(err);
909 goto out_splat;
910 }
911 }
912
913 res = ceph_real_mount(fsc, path);
914 if (IS_ERR(res))
915 goto out_splat;
916 dout("root %p inode %p ino %llx.%llx\n", res,
917 res->d_inode, ceph_vinop(res->d_inode));
918 return res;
919
920 out_splat:
921 ceph_mdsc_close_sessions(fsc->mdsc);
922 deactivate_locked_super(sb);
923 goto out_final;
924
925 out:
926 ceph_mdsc_destroy(fsc);
927 destroy_fs_client(fsc);
928 out_final:
929 dout("ceph_mount fail %ld\n", PTR_ERR(res));
930 return res;
931 }
932
933 static void ceph_kill_sb(struct super_block *s)
934 {
935 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
936 dout("kill_sb %p\n", s);
937 ceph_mdsc_pre_umount(fsc->mdsc);
938 kill_anon_super(s); /* will call put_super after sb is r/o */
939 ceph_mdsc_destroy(fsc);
940 destroy_fs_client(fsc);
941 }
942
943 static struct file_system_type ceph_fs_type = {
944 .owner = THIS_MODULE,
945 .name = "ceph",
946 .mount = ceph_mount,
947 .kill_sb = ceph_kill_sb,
948 .fs_flags = FS_RENAME_DOES_D_MOVE,
949 };
950
951 #define _STRINGIFY(x) #x
952 #define STRINGIFY(x) _STRINGIFY(x)
953
954 static int __init init_ceph(void)
955 {
956 int ret = init_caches();
957 if (ret)
958 goto out;
959
960 ceph_xattr_init();
961 ret = register_filesystem(&ceph_fs_type);
962 if (ret)
963 goto out_icache;
964
965 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
966
967 return 0;
968
969 out_icache:
970 ceph_xattr_exit();
971 destroy_caches();
972 out:
973 return ret;
974 }
975
976 static void __exit exit_ceph(void)
977 {
978 dout("exit_ceph\n");
979 unregister_filesystem(&ceph_fs_type);
980 ceph_xattr_exit();
981 destroy_caches();
982 }
983
984 module_init(init_ceph);
985 module_exit(exit_ceph);
986
987 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
988 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
989 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
990 MODULE_DESCRIPTION("Ceph filesystem for Linux");
991 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree