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spi-topcliff-pch: Fix issue for transmitting over 4KByte
[zen-stable.git] / fs / ceph / super.c
blob00de2c9568cd89b13af544b87bc2f43acefa8b30
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/decode.h>
22 #include <linux/ceph/mon_client.h>
23 #include <linux/ceph/auth.h>
24 #include <linux/ceph/debugfs.h>
25
26 /*
27 * Ceph superblock operations
28 *
29 * Handle the basics of mounting, unmounting.
30 */
31
32 /*
33 * super ops
34 */
35 static void ceph_put_super(struct super_block *s)
36 {
37 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
38
39 dout("put_super\n");
40 ceph_mdsc_close_sessions(fsc->mdsc);
41
42 /*
43 * ensure we release the bdi before put_anon_super releases
44 * the device name.
45 */
46 if (s->s_bdi == &fsc->backing_dev_info) {
47 bdi_unregister(&fsc->backing_dev_info);
48 s->s_bdi = NULL;
49 }
50
51 return;
52 }
53
54 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
55 {
56 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
57 struct ceph_monmap *monmap = fsc->client->monc.monmap;
58 struct ceph_statfs st;
59 u64 fsid;
60 int err;
61
62 dout("statfs\n");
63 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
64 if (err < 0)
65 return err;
66
67 /* fill in kstatfs */
68 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
69
70 /*
71 * express utilization in terms of large blocks to avoid
72 * overflow on 32-bit machines.
73 */
74 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
75 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
76 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
77 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
78
79 buf->f_files = le64_to_cpu(st.num_objects);
80 buf->f_ffree = -1;
81 buf->f_namelen = NAME_MAX;
82 buf->f_frsize = PAGE_CACHE_SIZE;
83
84 /* leave fsid little-endian, regardless of host endianness */
85 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
86 buf->f_fsid.val[0] = fsid & 0xffffffff;
87 buf->f_fsid.val[1] = fsid >> 32;
88
89 return 0;
90 }
91
92
93 static int ceph_sync_fs(struct super_block *sb, int wait)
94 {
95 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
96
97 if (!wait) {
98 dout("sync_fs (non-blocking)\n");
99 ceph_flush_dirty_caps(fsc->mdsc);
100 dout("sync_fs (non-blocking) done\n");
101 return 0;
102 }
103
104 dout("sync_fs (blocking)\n");
105 ceph_osdc_sync(&fsc->client->osdc);
106 ceph_mdsc_sync(fsc->mdsc);
107 dout("sync_fs (blocking) done\n");
108 return 0;
109 }
110
111 /*
112 * mount options
113 */
114 enum {
115 Opt_wsize,
116 Opt_rsize,
117 Opt_rasize,
118 Opt_caps_wanted_delay_min,
119 Opt_caps_wanted_delay_max,
120 Opt_cap_release_safety,
121 Opt_readdir_max_entries,
122 Opt_readdir_max_bytes,
123 Opt_congestion_kb,
124 Opt_last_int,
125 /* int args above */
126 Opt_snapdirname,
127 Opt_last_string,
128 /* string args above */
129 Opt_dirstat,
130 Opt_nodirstat,
131 Opt_rbytes,
132 Opt_norbytes,
133 Opt_noasyncreaddir,
134 Opt_dcache,
135 Opt_nodcache,
136 Opt_ino32,
137 };
138
139 static match_table_t fsopt_tokens = {
140 {Opt_wsize, "wsize=%d"},
141 {Opt_rsize, "rsize=%d"},
142 {Opt_rasize, "rasize=%d"},
143 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
144 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
145 {Opt_cap_release_safety, "cap_release_safety=%d"},
146 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
147 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
148 {Opt_congestion_kb, "write_congestion_kb=%d"},
149 /* int args above */
150 {Opt_snapdirname, "snapdirname=%s"},
151 /* string args above */
152 {Opt_dirstat, "dirstat"},
153 {Opt_nodirstat, "nodirstat"},
154 {Opt_rbytes, "rbytes"},
155 {Opt_norbytes, "norbytes"},
156 {Opt_noasyncreaddir, "noasyncreaddir"},
157 {Opt_dcache, "dcache"},
158 {Opt_nodcache, "nodcache"},
159 {Opt_ino32, "ino32"},
160 {-1, NULL}
161 };
162
163 static int parse_fsopt_token(char *c, void *private)
164 {
165 struct ceph_mount_options *fsopt = private;
166 substring_t argstr[MAX_OPT_ARGS];
167 int token, intval, ret;
168
169 token = match_token((char *)c, fsopt_tokens, argstr);
170 if (token < 0)
171 return -EINVAL;
172
173 if (token < Opt_last_int) {
174 ret = match_int(&argstr[0], &intval);
175 if (ret < 0) {
176 pr_err("bad mount option arg (not int) "
177 "at '%s'\n", c);
178 return ret;
179 }
180 dout("got int token %d val %d\n", token, intval);
181 } else if (token > Opt_last_int && token < Opt_last_string) {
182 dout("got string token %d val %s\n", token,
183 argstr[0].from);
184 } else {
185 dout("got token %d\n", token);
186 }
187
188 switch (token) {
189 case Opt_snapdirname:
190 kfree(fsopt->snapdir_name);
191 fsopt->snapdir_name = kstrndup(argstr[0].from,
192 argstr[0].to-argstr[0].from,
193 GFP_KERNEL);
194 if (!fsopt->snapdir_name)
195 return -ENOMEM;
196 break;
197
198 /* misc */
199 case Opt_wsize:
200 fsopt->wsize = intval;
201 break;
202 case Opt_rsize:
203 fsopt->rsize = intval;
204 break;
205 case Opt_rasize:
206 fsopt->rasize = intval;
207 break;
208 case Opt_caps_wanted_delay_min:
209 fsopt->caps_wanted_delay_min = intval;
210 break;
211 case Opt_caps_wanted_delay_max:
212 fsopt->caps_wanted_delay_max = intval;
213 break;
214 case Opt_readdir_max_entries:
215 fsopt->max_readdir = intval;
216 break;
217 case Opt_readdir_max_bytes:
218 fsopt->max_readdir_bytes = intval;
219 break;
220 case Opt_congestion_kb:
221 fsopt->congestion_kb = intval;
222 break;
223 case Opt_dirstat:
224 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
225 break;
226 case Opt_nodirstat:
227 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
228 break;
229 case Opt_rbytes:
230 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
231 break;
232 case Opt_norbytes:
233 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
234 break;
235 case Opt_noasyncreaddir:
236 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
237 break;
238 case Opt_dcache:
239 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
240 break;
241 case Opt_nodcache:
242 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
243 break;
244 case Opt_ino32:
245 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
246 break;
247 default:
248 BUG_ON(token);
249 }
250 return 0;
251 }
252
253 static void destroy_mount_options(struct ceph_mount_options *args)
254 {
255 dout("destroy_mount_options %p\n", args);
256 kfree(args->snapdir_name);
257 kfree(args);
258 }
259
260 static int strcmp_null(const char *s1, const char *s2)
261 {
262 if (!s1 && !s2)
263 return 0;
264 if (s1 && !s2)
265 return -1;
266 if (!s1 && s2)
267 return 1;
268 return strcmp(s1, s2);
269 }
270
271 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
272 struct ceph_options *new_opt,
273 struct ceph_fs_client *fsc)
274 {
275 struct ceph_mount_options *fsopt1 = new_fsopt;
276 struct ceph_mount_options *fsopt2 = fsc->mount_options;
277 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
278 int ret;
279
280 ret = memcmp(fsopt1, fsopt2, ofs);
281 if (ret)
282 return ret;
283
284 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
285 if (ret)
286 return ret;
287
288 return ceph_compare_options(new_opt, fsc->client);
289 }
290
291 static int parse_mount_options(struct ceph_mount_options **pfsopt,
292 struct ceph_options **popt,
293 int flags, char *options,
294 const char *dev_name,
295 const char **path)
296 {
297 struct ceph_mount_options *fsopt;
298 const char *dev_name_end;
299 int err = -ENOMEM;
300
301 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
302 if (!fsopt)
303 return -ENOMEM;
304
305 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
306
307 fsopt->sb_flags = flags;
308 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
309
310 fsopt->rsize = CEPH_RSIZE_DEFAULT;
311 fsopt->rasize = CEPH_RASIZE_DEFAULT;
312 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
313 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
314 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
315 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
316 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
317 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
318 fsopt->congestion_kb = default_congestion_kb();
319
320 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
321 err = -EINVAL;
322 if (!dev_name)
323 goto out;
324 *path = strstr(dev_name, ":/");
325 if (*path == NULL) {
326 pr_err("device name is missing path (no :/ in %s)\n",
327 dev_name);
328 goto out;
329 }
330 dev_name_end = *path;
331 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
332
333 /* path on server */
334 *path += 2;
335 dout("server path '%s'\n", *path);
336
337 err = ceph_parse_options(popt, options, dev_name, dev_name_end,
338 parse_fsopt_token, (void *)fsopt);
339 if (err)
340 goto out;
341
342 /* success */
343 *pfsopt = fsopt;
344 return 0;
345
346 out:
347 destroy_mount_options(fsopt);
348 return err;
349 }
350
351 /**
352 * ceph_show_options - Show mount options in /proc/mounts
353 * @m: seq_file to write to
354 * @root: root of that (sub)tree
355 */
356 static int ceph_show_options(struct seq_file *m, struct dentry *root)
357 {
358 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
359 struct ceph_mount_options *fsopt = fsc->mount_options;
360 struct ceph_options *opt = fsc->client->options;
361
362 if (opt->flags & CEPH_OPT_FSID)
363 seq_printf(m, ",fsid=%pU", &opt->fsid);
364 if (opt->flags & CEPH_OPT_NOSHARE)
365 seq_puts(m, ",noshare");
366 if (opt->flags & CEPH_OPT_NOCRC)
367 seq_puts(m, ",nocrc");
368
369 if (opt->name)
370 seq_printf(m, ",name=%s", opt->name);
371 if (opt->key)
372 seq_puts(m, ",secret=<hidden>");
373
374 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
375 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
376 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
377 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
378 if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
379 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout);
380 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
381 seq_printf(m, ",osdkeepalivetimeout=%d",
382 opt->osd_keepalive_timeout);
383
384 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
385 seq_puts(m, ",dirstat");
386 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
387 seq_puts(m, ",norbytes");
388 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
389 seq_puts(m, ",noasyncreaddir");
390 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
391 seq_puts(m, ",dcache");
392 else
393 seq_puts(m, ",nodcache");
394
395 if (fsopt->wsize)
396 seq_printf(m, ",wsize=%d", fsopt->wsize);
397 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
398 seq_printf(m, ",rsize=%d", fsopt->rsize);
399 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
400 seq_printf(m, ",rasize=%d", fsopt->rasize);
401 if (fsopt->congestion_kb != default_congestion_kb())
402 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
403 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
404 seq_printf(m, ",caps_wanted_delay_min=%d",
405 fsopt->caps_wanted_delay_min);
406 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
407 seq_printf(m, ",caps_wanted_delay_max=%d",
408 fsopt->caps_wanted_delay_max);
409 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
410 seq_printf(m, ",cap_release_safety=%d",
411 fsopt->cap_release_safety);
412 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
413 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
414 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
415 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
416 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
417 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
418 return 0;
419 }
420
421 /*
422 * handle any mon messages the standard library doesn't understand.
423 * return error if we don't either.
424 */
425 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
426 {
427 struct ceph_fs_client *fsc = client->private;
428 int type = le16_to_cpu(msg->hdr.type);
429
430 switch (type) {
431 case CEPH_MSG_MDS_MAP:
432 ceph_mdsc_handle_map(fsc->mdsc, msg);
433 return 0;
434
435 default:
436 return -1;
437 }
438 }
439
440 /*
441 * create a new fs client
442 */
443 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
444 struct ceph_options *opt)
445 {
446 struct ceph_fs_client *fsc;
447 const unsigned supported_features =
448 CEPH_FEATURE_FLOCK |
449 CEPH_FEATURE_DIRLAYOUTHASH;
450 const unsigned required_features = 0;
451 int err = -ENOMEM;
452
453 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
454 if (!fsc)
455 return ERR_PTR(-ENOMEM);
456
457 fsc->client = ceph_create_client(opt, fsc, supported_features,
458 required_features);
459 if (IS_ERR(fsc->client)) {
460 err = PTR_ERR(fsc->client);
461 goto fail;
462 }
463 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
464 fsc->client->monc.want_mdsmap = 1;
465
466 fsc->mount_options = fsopt;
467
468 fsc->sb = NULL;
469 fsc->mount_state = CEPH_MOUNT_MOUNTING;
470
471 atomic_long_set(&fsc->writeback_count, 0);
472
473 err = bdi_init(&fsc->backing_dev_info);
474 if (err < 0)
475 goto fail_client;
476
477 err = -ENOMEM;
478 /*
479 * The number of concurrent works can be high but they don't need
480 * to be processed in parallel, limit concurrency.
481 */
482 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
483 if (fsc->wb_wq == NULL)
484 goto fail_bdi;
485 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
486 if (fsc->pg_inv_wq == NULL)
487 goto fail_wb_wq;
488 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
489 if (fsc->trunc_wq == NULL)
490 goto fail_pg_inv_wq;
491
492 /* set up mempools */
493 err = -ENOMEM;
494 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
495 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
496 if (!fsc->wb_pagevec_pool)
497 goto fail_trunc_wq;
498
499 /* caps */
500 fsc->min_caps = fsopt->max_readdir;
501
502 return fsc;
503
504 fail_trunc_wq:
505 destroy_workqueue(fsc->trunc_wq);
506 fail_pg_inv_wq:
507 destroy_workqueue(fsc->pg_inv_wq);
508 fail_wb_wq:
509 destroy_workqueue(fsc->wb_wq);
510 fail_bdi:
511 bdi_destroy(&fsc->backing_dev_info);
512 fail_client:
513 ceph_destroy_client(fsc->client);
514 fail:
515 kfree(fsc);
516 return ERR_PTR(err);
517 }
518
519 static void destroy_fs_client(struct ceph_fs_client *fsc)
520 {
521 dout("destroy_fs_client %p\n", fsc);
522
523 destroy_workqueue(fsc->wb_wq);
524 destroy_workqueue(fsc->pg_inv_wq);
525 destroy_workqueue(fsc->trunc_wq);
526
527 bdi_destroy(&fsc->backing_dev_info);
528
529 mempool_destroy(fsc->wb_pagevec_pool);
530
531 destroy_mount_options(fsc->mount_options);
532
533 ceph_fs_debugfs_cleanup(fsc);
534
535 ceph_destroy_client(fsc->client);
536
537 kfree(fsc);
538 dout("destroy_fs_client %p done\n", fsc);
539 }
540
541 /*
542 * caches
543 */
544 struct kmem_cache *ceph_inode_cachep;
545 struct kmem_cache *ceph_cap_cachep;
546 struct kmem_cache *ceph_dentry_cachep;
547 struct kmem_cache *ceph_file_cachep;
548
549 static void ceph_inode_init_once(void *foo)
550 {
551 struct ceph_inode_info *ci = foo;
552 inode_init_once(&ci->vfs_inode);
553 }
554
555 static int __init init_caches(void)
556 {
557 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
558 sizeof(struct ceph_inode_info),
559 __alignof__(struct ceph_inode_info),
560 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
561 ceph_inode_init_once);
562 if (ceph_inode_cachep == NULL)
563 return -ENOMEM;
564
565 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
566 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
567 if (ceph_cap_cachep == NULL)
568 goto bad_cap;
569
570 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
571 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
572 if (ceph_dentry_cachep == NULL)
573 goto bad_dentry;
574
575 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
576 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
577 if (ceph_file_cachep == NULL)
578 goto bad_file;
579
580 return 0;
581
582 bad_file:
583 kmem_cache_destroy(ceph_dentry_cachep);
584 bad_dentry:
585 kmem_cache_destroy(ceph_cap_cachep);
586 bad_cap:
587 kmem_cache_destroy(ceph_inode_cachep);
588 return -ENOMEM;
589 }
590
591 static void destroy_caches(void)
592 {
593 kmem_cache_destroy(ceph_inode_cachep);
594 kmem_cache_destroy(ceph_cap_cachep);
595 kmem_cache_destroy(ceph_dentry_cachep);
596 kmem_cache_destroy(ceph_file_cachep);
597 }
598
599
600 /*
601 * ceph_umount_begin - initiate forced umount. Tear down down the
602 * mount, skipping steps that may hang while waiting for server(s).
603 */
604 static void ceph_umount_begin(struct super_block *sb)
605 {
606 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
607
608 dout("ceph_umount_begin - starting forced umount\n");
609 if (!fsc)
610 return;
611 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
612 return;
613 }
614
615 static const struct super_operations ceph_super_ops = {
616 .alloc_inode = ceph_alloc_inode,
617 .destroy_inode = ceph_destroy_inode,
618 .write_inode = ceph_write_inode,
619 .sync_fs = ceph_sync_fs,
620 .put_super = ceph_put_super,
621 .show_options = ceph_show_options,
622 .statfs = ceph_statfs,
623 .umount_begin = ceph_umount_begin,
624 };
625
626 /*
627 * Bootstrap mount by opening the root directory. Note the mount
628 * @started time from caller, and time out if this takes too long.
629 */
630 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
631 const char *path,
632 unsigned long started)
633 {
634 struct ceph_mds_client *mdsc = fsc->mdsc;
635 struct ceph_mds_request *req = NULL;
636 int err;
637 struct dentry *root;
638
639 /* open dir */
640 dout("open_root_inode opening '%s'\n", path);
641 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
642 if (IS_ERR(req))
643 return ERR_CAST(req);
644 req->r_path1 = kstrdup(path, GFP_NOFS);
645 req->r_ino1.ino = CEPH_INO_ROOT;
646 req->r_ino1.snap = CEPH_NOSNAP;
647 req->r_started = started;
648 req->r_timeout = fsc->client->options->mount_timeout * HZ;
649 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
650 req->r_num_caps = 2;
651 err = ceph_mdsc_do_request(mdsc, NULL, req);
652 if (err == 0) {
653 struct inode *inode = req->r_target_inode;
654 req->r_target_inode = NULL;
655 dout("open_root_inode success\n");
656 if (ceph_ino(inode) == CEPH_INO_ROOT &&
657 fsc->sb->s_root == NULL) {
658 root = d_alloc_root(inode);
659 if (!root) {
660 iput(inode);
661 root = ERR_PTR(-ENOMEM);
662 goto out;
663 }
664 } else {
665 root = d_obtain_alias(inode);
666 }
667 ceph_init_dentry(root);
668 dout("open_root_inode success, root dentry is %p\n", root);
669 } else {
670 root = ERR_PTR(err);
671 }
672 out:
673 ceph_mdsc_put_request(req);
674 return root;
675 }
676
677
678
679
680 /*
681 * mount: join the ceph cluster, and open root directory.
682 */
683 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
684 const char *path)
685 {
686 int err;
687 unsigned long started = jiffies; /* note the start time */
688 struct dentry *root;
689 int first = 0; /* first vfsmount for this super_block */
690
691 dout("mount start\n");
692 mutex_lock(&fsc->client->mount_mutex);
693
694 err = __ceph_open_session(fsc->client, started);
695 if (err < 0)
696 goto out;
697
698 dout("mount opening root\n");
699 root = open_root_dentry(fsc, "", started);
700 if (IS_ERR(root)) {
701 err = PTR_ERR(root);
702 goto out;
703 }
704 if (fsc->sb->s_root) {
705 dput(root);
706 } else {
707 fsc->sb->s_root = root;
708 first = 1;
709
710 err = ceph_fs_debugfs_init(fsc);
711 if (err < 0)
712 goto fail;
713 }
714
715 if (path[0] == 0) {
716 dget(root);
717 } else {
718 dout("mount opening base mountpoint\n");
719 root = open_root_dentry(fsc, path, started);
720 if (IS_ERR(root)) {
721 err = PTR_ERR(root);
722 goto fail;
723 }
724 }
725
726 fsc->mount_state = CEPH_MOUNT_MOUNTED;
727 dout("mount success\n");
728 mutex_unlock(&fsc->client->mount_mutex);
729 return root;
730
731 out:
732 mutex_unlock(&fsc->client->mount_mutex);
733 return ERR_PTR(err);
734
735 fail:
736 if (first) {
737 dput(fsc->sb->s_root);
738 fsc->sb->s_root = NULL;
739 }
740 goto out;
741 }
742
743 static int ceph_set_super(struct super_block *s, void *data)
744 {
745 struct ceph_fs_client *fsc = data;
746 int ret;
747
748 dout("set_super %p data %p\n", s, data);
749
750 s->s_flags = fsc->mount_options->sb_flags;
751 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
752
753 s->s_fs_info = fsc;
754 fsc->sb = s;
755
756 s->s_op = &ceph_super_ops;
757 s->s_export_op = &ceph_export_ops;
758
759 s->s_time_gran = 1000; /* 1000 ns == 1 us */
760
761 ret = set_anon_super(s, NULL); /* what is that second arg for? */
762 if (ret != 0)
763 goto fail;
764
765 return ret;
766
767 fail:
768 s->s_fs_info = NULL;
769 fsc->sb = NULL;
770 return ret;
771 }
772
773 /*
774 * share superblock if same fs AND options
775 */
776 static int ceph_compare_super(struct super_block *sb, void *data)
777 {
778 struct ceph_fs_client *new = data;
779 struct ceph_mount_options *fsopt = new->mount_options;
780 struct ceph_options *opt = new->client->options;
781 struct ceph_fs_client *other = ceph_sb_to_client(sb);
782
783 dout("ceph_compare_super %p\n", sb);
784
785 if (compare_mount_options(fsopt, opt, other)) {
786 dout("monitor(s)/mount options don't match\n");
787 return 0;
788 }
789 if ((opt->flags & CEPH_OPT_FSID) &&
790 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
791 dout("fsid doesn't match\n");
792 return 0;
793 }
794 if (fsopt->sb_flags != other->mount_options->sb_flags) {
795 dout("flags differ\n");
796 return 0;
797 }
798 return 1;
799 }
800
801 /*
802 * construct our own bdi so we can control readahead, etc.
803 */
804 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
805
806 static int ceph_register_bdi(struct super_block *sb,
807 struct ceph_fs_client *fsc)
808 {
809 int err;
810
811 /* set ra_pages based on rasize mount option? */
812 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
813 fsc->backing_dev_info.ra_pages =
814 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
815 >> PAGE_SHIFT;
816 else
817 fsc->backing_dev_info.ra_pages =
818 default_backing_dev_info.ra_pages;
819
820 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d",
821 atomic_long_inc_return(&bdi_seq));
822 if (!err)
823 sb->s_bdi = &fsc->backing_dev_info;
824 return err;
825 }
826
827 static struct dentry *ceph_mount(struct file_system_type *fs_type,
828 int flags, const char *dev_name, void *data)
829 {
830 struct super_block *sb;
831 struct ceph_fs_client *fsc;
832 struct dentry *res;
833 int err;
834 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
835 const char *path = NULL;
836 struct ceph_mount_options *fsopt = NULL;
837 struct ceph_options *opt = NULL;
838
839 dout("ceph_mount\n");
840 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
841 if (err < 0) {
842 res = ERR_PTR(err);
843 goto out_final;
844 }
845
846 /* create client (which we may/may not use) */
847 fsc = create_fs_client(fsopt, opt);
848 if (IS_ERR(fsc)) {
849 res = ERR_CAST(fsc);
850 destroy_mount_options(fsopt);
851 ceph_destroy_options(opt);
852 goto out_final;
853 }
854
855 err = ceph_mdsc_init(fsc);
856 if (err < 0) {
857 res = ERR_PTR(err);
858 goto out;
859 }
860
861 if (ceph_test_opt(fsc->client, NOSHARE))
862 compare_super = NULL;
863 sb = sget(fs_type, compare_super, ceph_set_super, fsc);
864 if (IS_ERR(sb)) {
865 res = ERR_CAST(sb);
866 goto out;
867 }
868
869 if (ceph_sb_to_client(sb) != fsc) {
870 ceph_mdsc_destroy(fsc);
871 destroy_fs_client(fsc);
872 fsc = ceph_sb_to_client(sb);
873 dout("get_sb got existing client %p\n", fsc);
874 } else {
875 dout("get_sb using new client %p\n", fsc);
876 err = ceph_register_bdi(sb, fsc);
877 if (err < 0) {
878 res = ERR_PTR(err);
879 goto out_splat;
880 }
881 }
882
883 res = ceph_real_mount(fsc, path);
884 if (IS_ERR(res))
885 goto out_splat;
886 dout("root %p inode %p ino %llx.%llx\n", res,
887 res->d_inode, ceph_vinop(res->d_inode));
888 return res;
889
890 out_splat:
891 ceph_mdsc_close_sessions(fsc->mdsc);
892 deactivate_locked_super(sb);
893 goto out_final;
894
895 out:
896 ceph_mdsc_destroy(fsc);
897 destroy_fs_client(fsc);
898 out_final:
899 dout("ceph_mount fail %ld\n", PTR_ERR(res));
900 return res;
901 }
902
903 static void ceph_kill_sb(struct super_block *s)
904 {
905 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
906 dout("kill_sb %p\n", s);
907 ceph_mdsc_pre_umount(fsc->mdsc);
908 kill_anon_super(s); /* will call put_super after sb is r/o */
909 ceph_mdsc_destroy(fsc);
910 destroy_fs_client(fsc);
911 }
912
913 static struct file_system_type ceph_fs_type = {
914 .owner = THIS_MODULE,
915 .name = "ceph",
916 .mount = ceph_mount,
917 .kill_sb = ceph_kill_sb,
918 .fs_flags = FS_RENAME_DOES_D_MOVE,
919 };
920
921 #define _STRINGIFY(x) #x
922 #define STRINGIFY(x) _STRINGIFY(x)
923
924 static int __init init_ceph(void)
925 {
926 int ret = init_caches();
927 if (ret)
928 goto out;
929
930 ret = register_filesystem(&ceph_fs_type);
931 if (ret)
932 goto out_icache;
933
934 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
935
936 return 0;
937
938 out_icache:
939 destroy_caches();
940 out:
941 return ret;
942 }
943
944 static void __exit exit_ceph(void)
945 {
946 dout("exit_ceph\n");
947 unregister_filesystem(&ceph_fs_type);
948 destroy_caches();
949 }
950
951 module_init(init_ceph);
952 module_exit(exit_ceph);
953
954 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
955 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
956 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
957 MODULE_DESCRIPTION("Ceph filesystem for Linux");
958 MODULE_LICENSE("GPL");