?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'linux-kselftest-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[linux/fpc-iii.git] / fs / ceph / super.c
blobe4082afedcb15a447ee7fd344aa2a3def391d43c
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 u64 data_pool;
53
54 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
55 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
56 } else {
57 data_pool = CEPH_NOPOOL;
58 }
59
60 dout("statfs\n");
61 err = ceph_monc_do_statfs(&fsc->client->monc, data_pool, &st);
62 if (err < 0)
63 return err;
64
65 /* fill in kstatfs */
66 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
67
68 /*
69 * express utilization in terms of large blocks to avoid
70 * overflow on 32-bit machines.
71 *
72 * NOTE: for the time being, we make bsize == frsize to humor
73 * not-yet-ancient versions of glibc that are broken.
74 * Someday, we will probably want to report a real block
75 * size... whatever that may mean for a network file system!
76 */
77 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
78 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
79 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
80 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
81 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
82
83 buf->f_files = le64_to_cpu(st.num_objects);
84 buf->f_ffree = -1;
85 buf->f_namelen = NAME_MAX;
86
87 /* leave fsid little-endian, regardless of host endianness */
88 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
89 buf->f_fsid.val[0] = fsid & 0xffffffff;
90 buf->f_fsid.val[1] = fsid >> 32;
91
92 return 0;
93 }
94
95
96 static int ceph_sync_fs(struct super_block *sb, int wait)
97 {
98 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
99
100 if (!wait) {
101 dout("sync_fs (non-blocking)\n");
102 ceph_flush_dirty_caps(fsc->mdsc);
103 dout("sync_fs (non-blocking) done\n");
104 return 0;
105 }
106
107 dout("sync_fs (blocking)\n");
108 ceph_osdc_sync(&fsc->client->osdc);
109 ceph_mdsc_sync(fsc->mdsc);
110 dout("sync_fs (blocking) done\n");
111 return 0;
112 }
113
114 /*
115 * mount options
116 */
117 enum {
118 Opt_wsize,
119 Opt_rsize,
120 Opt_rasize,
121 Opt_caps_wanted_delay_min,
122 Opt_caps_wanted_delay_max,
123 Opt_readdir_max_entries,
124 Opt_readdir_max_bytes,
125 Opt_congestion_kb,
126 Opt_last_int,
127 /* int args above */
128 Opt_snapdirname,
129 Opt_mds_namespace,
130 Opt_fscache_uniq,
131 Opt_last_string,
132 /* string args above */
133 Opt_dirstat,
134 Opt_nodirstat,
135 Opt_rbytes,
136 Opt_norbytes,
137 Opt_asyncreaddir,
138 Opt_noasyncreaddir,
139 Opt_dcache,
140 Opt_nodcache,
141 Opt_ino32,
142 Opt_noino32,
143 Opt_fscache,
144 Opt_nofscache,
145 Opt_poolperm,
146 Opt_nopoolperm,
147 Opt_require_active_mds,
148 Opt_norequire_active_mds,
149 #ifdef CONFIG_CEPH_FS_POSIX_ACL
150 Opt_acl,
151 #endif
152 Opt_noacl,
153 };
154
155 static match_table_t fsopt_tokens = {
156 {Opt_wsize, "wsize=%d"},
157 {Opt_rsize, "rsize=%d"},
158 {Opt_rasize, "rasize=%d"},
159 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
160 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
161 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
162 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
163 {Opt_congestion_kb, "write_congestion_kb=%d"},
164 /* int args above */
165 {Opt_snapdirname, "snapdirname=%s"},
166 {Opt_mds_namespace, "mds_namespace=%s"},
167 {Opt_fscache_uniq, "fsc=%s"},
168 /* string args above */
169 {Opt_dirstat, "dirstat"},
170 {Opt_nodirstat, "nodirstat"},
171 {Opt_rbytes, "rbytes"},
172 {Opt_norbytes, "norbytes"},
173 {Opt_asyncreaddir, "asyncreaddir"},
174 {Opt_noasyncreaddir, "noasyncreaddir"},
175 {Opt_dcache, "dcache"},
176 {Opt_nodcache, "nodcache"},
177 {Opt_ino32, "ino32"},
178 {Opt_noino32, "noino32"},
179 {Opt_fscache, "fsc"},
180 {Opt_nofscache, "nofsc"},
181 {Opt_poolperm, "poolperm"},
182 {Opt_nopoolperm, "nopoolperm"},
183 {Opt_require_active_mds, "require_active_mds"},
184 {Opt_norequire_active_mds, "norequire_active_mds"},
185 #ifdef CONFIG_CEPH_FS_POSIX_ACL
186 {Opt_acl, "acl"},
187 #endif
188 {Opt_noacl, "noacl"},
189 {-1, NULL}
190 };
191
192 static int parse_fsopt_token(char *c, void *private)
193 {
194 struct ceph_mount_options *fsopt = private;
195 substring_t argstr[MAX_OPT_ARGS];
196 int token, intval, ret;
197
198 token = match_token((char *)c, fsopt_tokens, argstr);
199 if (token < 0)
200 return -EINVAL;
201
202 if (token < Opt_last_int) {
203 ret = match_int(&argstr[0], &intval);
204 if (ret < 0) {
205 pr_err("bad mount option arg (not int) "
206 "at '%s'\n", c);
207 return ret;
208 }
209 dout("got int token %d val %d\n", token, intval);
210 } else if (token > Opt_last_int && token < Opt_last_string) {
211 dout("got string token %d val %s\n", token,
212 argstr[0].from);
213 } else {
214 dout("got token %d\n", token);
215 }
216
217 switch (token) {
218 case Opt_snapdirname:
219 kfree(fsopt->snapdir_name);
220 fsopt->snapdir_name = kstrndup(argstr[0].from,
221 argstr[0].to-argstr[0].from,
222 GFP_KERNEL);
223 if (!fsopt->snapdir_name)
224 return -ENOMEM;
225 break;
226 case Opt_mds_namespace:
227 fsopt->mds_namespace = kstrndup(argstr[0].from,
228 argstr[0].to-argstr[0].from,
229 GFP_KERNEL);
230 if (!fsopt->mds_namespace)
231 return -ENOMEM;
232 break;
233 case Opt_fscache_uniq:
234 fsopt->fscache_uniq = kstrndup(argstr[0].from,
235 argstr[0].to-argstr[0].from,
236 GFP_KERNEL);
237 if (!fsopt->fscache_uniq)
238 return -ENOMEM;
239 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
240 break;
241 /* misc */
242 case Opt_wsize:
243 if (intval < PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
244 return -EINVAL;
245 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
246 break;
247 case Opt_rsize:
248 if (intval < PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
249 return -EINVAL;
250 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
251 break;
252 case Opt_rasize:
253 if (intval < 0)
254 return -EINVAL;
255 fsopt->rasize = ALIGN(intval + PAGE_SIZE - 1, PAGE_SIZE);
256 break;
257 case Opt_caps_wanted_delay_min:
258 if (intval < 1)
259 return -EINVAL;
260 fsopt->caps_wanted_delay_min = intval;
261 break;
262 case Opt_caps_wanted_delay_max:
263 if (intval < 1)
264 return -EINVAL;
265 fsopt->caps_wanted_delay_max = intval;
266 break;
267 case Opt_readdir_max_entries:
268 if (intval < 1)
269 return -EINVAL;
270 fsopt->max_readdir = intval;
271 break;
272 case Opt_readdir_max_bytes:
273 if (intval < PAGE_SIZE && intval != 0)
274 return -EINVAL;
275 fsopt->max_readdir_bytes = intval;
276 break;
277 case Opt_congestion_kb:
278 if (intval < 1024) /* at least 1M */
279 return -EINVAL;
280 fsopt->congestion_kb = intval;
281 break;
282 case Opt_dirstat:
283 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
284 break;
285 case Opt_nodirstat:
286 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
287 break;
288 case Opt_rbytes:
289 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
290 break;
291 case Opt_norbytes:
292 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
293 break;
294 case Opt_asyncreaddir:
295 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
296 break;
297 case Opt_noasyncreaddir:
298 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
299 break;
300 case Opt_dcache:
301 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
302 break;
303 case Opt_nodcache:
304 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
305 break;
306 case Opt_ino32:
307 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
308 break;
309 case Opt_noino32:
310 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
311 break;
312 case Opt_fscache:
313 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
314 break;
315 case Opt_nofscache:
316 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
317 break;
318 case Opt_poolperm:
319 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
320 printk ("pool perm");
321 break;
322 case Opt_nopoolperm:
323 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
324 break;
325 case Opt_require_active_mds:
326 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
327 break;
328 case Opt_norequire_active_mds:
329 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
330 break;
331 #ifdef CONFIG_CEPH_FS_POSIX_ACL
332 case Opt_acl:
333 fsopt->sb_flags |= MS_POSIXACL;
334 break;
335 #endif
336 case Opt_noacl:
337 fsopt->sb_flags &= ~MS_POSIXACL;
338 break;
339 default:
340 BUG_ON(token);
341 }
342 return 0;
343 }
344
345 static void destroy_mount_options(struct ceph_mount_options *args)
346 {
347 dout("destroy_mount_options %p\n", args);
348 kfree(args->snapdir_name);
349 kfree(args->mds_namespace);
350 kfree(args->server_path);
351 kfree(args->fscache_uniq);
352 kfree(args);
353 }
354
355 static int strcmp_null(const char *s1, const char *s2)
356 {
357 if (!s1 && !s2)
358 return 0;
359 if (s1 && !s2)
360 return -1;
361 if (!s1 && s2)
362 return 1;
363 return strcmp(s1, s2);
364 }
365
366 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
367 struct ceph_options *new_opt,
368 struct ceph_fs_client *fsc)
369 {
370 struct ceph_mount_options *fsopt1 = new_fsopt;
371 struct ceph_mount_options *fsopt2 = fsc->mount_options;
372 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
373 int ret;
374
375 ret = memcmp(fsopt1, fsopt2, ofs);
376 if (ret)
377 return ret;
378
379 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
380 if (ret)
381 return ret;
382 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
383 if (ret)
384 return ret;
385 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
386 if (ret)
387 return ret;
388 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
389 if (ret)
390 return ret;
391
392 return ceph_compare_options(new_opt, fsc->client);
393 }
394
395 static int parse_mount_options(struct ceph_mount_options **pfsopt,
396 struct ceph_options **popt,
397 int flags, char *options,
398 const char *dev_name)
399 {
400 struct ceph_mount_options *fsopt;
401 const char *dev_name_end;
402 int err;
403
404 if (!dev_name || !*dev_name)
405 return -EINVAL;
406
407 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
408 if (!fsopt)
409 return -ENOMEM;
410
411 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
412
413 fsopt->sb_flags = flags;
414 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
415
416 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
417 fsopt->rsize = CEPH_MAX_READ_SIZE;
418 fsopt->rasize = CEPH_RASIZE_DEFAULT;
419 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
420 if (!fsopt->snapdir_name) {
421 err = -ENOMEM;
422 goto out;
423 }
424
425 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
426 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
427 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
428 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
429 fsopt->congestion_kb = default_congestion_kb();
430
431 /*
432 * Distinguish the server list from the path in "dev_name".
433 * Internally we do not include the leading '/' in the path.
434 *
435 * "dev_name" will look like:
436 * <server_spec>[,<server_spec>...]:[<path>]
437 * where
438 * <server_spec> is <ip>[:<port>]
439 * <path> is optional, but if present must begin with '/'
440 */
441 dev_name_end = strchr(dev_name, '/');
442 if (dev_name_end) {
443 if (strlen(dev_name_end) > 1) {
444 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
445 if (!fsopt->server_path) {
446 err = -ENOMEM;
447 goto out;
448 }
449 }
450 } else {
451 dev_name_end = dev_name + strlen(dev_name);
452 }
453 err = -EINVAL;
454 dev_name_end--; /* back up to ':' separator */
455 if (dev_name_end < dev_name || *dev_name_end != ':') {
456 pr_err("device name is missing path (no : separator in %s)\n",
457 dev_name);
458 goto out;
459 }
460 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
461 if (fsopt->server_path)
462 dout("server path '%s'\n", fsopt->server_path);
463
464 *popt = ceph_parse_options(options, dev_name, dev_name_end,
465 parse_fsopt_token, (void *)fsopt);
466 if (IS_ERR(*popt)) {
467 err = PTR_ERR(*popt);
468 goto out;
469 }
470
471 /* success */
472 *pfsopt = fsopt;
473 return 0;
474
475 out:
476 destroy_mount_options(fsopt);
477 return err;
478 }
479
480 /**
481 * ceph_show_options - Show mount options in /proc/mounts
482 * @m: seq_file to write to
483 * @root: root of that (sub)tree
484 */
485 static int ceph_show_options(struct seq_file *m, struct dentry *root)
486 {
487 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
488 struct ceph_mount_options *fsopt = fsc->mount_options;
489 size_t pos;
490 int ret;
491
492 /* a comma between MNT/MS and client options */
493 seq_putc(m, ',');
494 pos = m->count;
495
496 ret = ceph_print_client_options(m, fsc->client);
497 if (ret)
498 return ret;
499
500 /* retract our comma if no client options */
501 if (m->count == pos)
502 m->count--;
503
504 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
505 seq_puts(m, ",dirstat");
506 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
507 seq_puts(m, ",rbytes");
508 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
509 seq_puts(m, ",noasyncreaddir");
510 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
511 seq_puts(m, ",nodcache");
512 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
513 if (fsopt->fscache_uniq)
514 seq_printf(m, ",fsc=%s", fsopt->fscache_uniq);
515 else
516 seq_puts(m, ",fsc");
517 }
518 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
519 seq_puts(m, ",nopoolperm");
520
521 #ifdef CONFIG_CEPH_FS_POSIX_ACL
522 if (fsopt->sb_flags & MS_POSIXACL)
523 seq_puts(m, ",acl");
524 else
525 seq_puts(m, ",noacl");
526 #endif
527
528 if (fsopt->mds_namespace)
529 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
530 if (fsopt->wsize)
531 seq_printf(m, ",wsize=%d", fsopt->wsize);
532 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
533 seq_printf(m, ",rsize=%d", fsopt->rsize);
534 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
535 seq_printf(m, ",rasize=%d", fsopt->rasize);
536 if (fsopt->congestion_kb != default_congestion_kb())
537 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
538 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
539 seq_printf(m, ",caps_wanted_delay_min=%d",
540 fsopt->caps_wanted_delay_min);
541 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
542 seq_printf(m, ",caps_wanted_delay_max=%d",
543 fsopt->caps_wanted_delay_max);
544 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
545 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
546 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
547 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
548 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
549 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
550
551 return 0;
552 }
553
554 /*
555 * handle any mon messages the standard library doesn't understand.
556 * return error if we don't either.
557 */
558 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
559 {
560 struct ceph_fs_client *fsc = client->private;
561 int type = le16_to_cpu(msg->hdr.type);
562
563 switch (type) {
564 case CEPH_MSG_MDS_MAP:
565 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
566 return 0;
567 case CEPH_MSG_FS_MAP_USER:
568 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
569 return 0;
570 default:
571 return -1;
572 }
573 }
574
575 /*
576 * create a new fs client
577 */
578 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
579 struct ceph_options *opt)
580 {
581 struct ceph_fs_client *fsc;
582 int page_count;
583 size_t size;
584 int err = -ENOMEM;
585
586 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
587 if (!fsc)
588 return ERR_PTR(-ENOMEM);
589
590 fsc->client = ceph_create_client(opt, fsc);
591 if (IS_ERR(fsc->client)) {
592 err = PTR_ERR(fsc->client);
593 goto fail;
594 }
595 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
596
597 if (!fsopt->mds_namespace) {
598 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
599 0, true);
600 } else {
601 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
602 0, false);
603 }
604
605 fsc->mount_options = fsopt;
606
607 fsc->sb = NULL;
608 fsc->mount_state = CEPH_MOUNT_MOUNTING;
609
610 atomic_long_set(&fsc->writeback_count, 0);
611
612 err = -ENOMEM;
613 /*
614 * The number of concurrent works can be high but they don't need
615 * to be processed in parallel, limit concurrency.
616 */
617 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
618 if (!fsc->wb_wq)
619 goto fail_client;
620 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
621 if (!fsc->pg_inv_wq)
622 goto fail_wb_wq;
623 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
624 if (!fsc->trunc_wq)
625 goto fail_pg_inv_wq;
626
627 /* set up mempools */
628 err = -ENOMEM;
629 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
630 size = sizeof (struct page *) * (page_count ? page_count : 1);
631 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
632 if (!fsc->wb_pagevec_pool)
633 goto fail_trunc_wq;
634
635 /* caps */
636 fsc->min_caps = fsopt->max_readdir;
637
638 return fsc;
639
640 fail_trunc_wq:
641 destroy_workqueue(fsc->trunc_wq);
642 fail_pg_inv_wq:
643 destroy_workqueue(fsc->pg_inv_wq);
644 fail_wb_wq:
645 destroy_workqueue(fsc->wb_wq);
646 fail_client:
647 ceph_destroy_client(fsc->client);
648 fail:
649 kfree(fsc);
650 return ERR_PTR(err);
651 }
652
653 static void destroy_fs_client(struct ceph_fs_client *fsc)
654 {
655 dout("destroy_fs_client %p\n", fsc);
656
657 destroy_workqueue(fsc->wb_wq);
658 destroy_workqueue(fsc->pg_inv_wq);
659 destroy_workqueue(fsc->trunc_wq);
660
661 mempool_destroy(fsc->wb_pagevec_pool);
662
663 destroy_mount_options(fsc->mount_options);
664
665 ceph_destroy_client(fsc->client);
666
667 kfree(fsc);
668 dout("destroy_fs_client %p done\n", fsc);
669 }
670
671 /*
672 * caches
673 */
674 struct kmem_cache *ceph_inode_cachep;
675 struct kmem_cache *ceph_cap_cachep;
676 struct kmem_cache *ceph_cap_flush_cachep;
677 struct kmem_cache *ceph_dentry_cachep;
678 struct kmem_cache *ceph_file_cachep;
679
680 static void ceph_inode_init_once(void *foo)
681 {
682 struct ceph_inode_info *ci = foo;
683 inode_init_once(&ci->vfs_inode);
684 }
685
686 static int __init init_caches(void)
687 {
688 int error = -ENOMEM;
689
690 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
691 sizeof(struct ceph_inode_info),
692 __alignof__(struct ceph_inode_info),
693 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
694 SLAB_ACCOUNT, ceph_inode_init_once);
695 if (!ceph_inode_cachep)
696 return -ENOMEM;
697
698 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
699 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
700 if (!ceph_cap_cachep)
701 goto bad_cap;
702 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
703 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
704 if (!ceph_cap_flush_cachep)
705 goto bad_cap_flush;
706
707 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
708 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
709 if (!ceph_dentry_cachep)
710 goto bad_dentry;
711
712 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
713
714 if (!ceph_file_cachep)
715 goto bad_file;
716
717 if ((error = ceph_fscache_register()))
718 goto bad_file;
719
720 return 0;
721 bad_file:
722 kmem_cache_destroy(ceph_dentry_cachep);
723 bad_dentry:
724 kmem_cache_destroy(ceph_cap_flush_cachep);
725 bad_cap_flush:
726 kmem_cache_destroy(ceph_cap_cachep);
727 bad_cap:
728 kmem_cache_destroy(ceph_inode_cachep);
729 return error;
730 }
731
732 static void destroy_caches(void)
733 {
734 /*
735 * Make sure all delayed rcu free inodes are flushed before we
736 * destroy cache.
737 */
738 rcu_barrier();
739
740 kmem_cache_destroy(ceph_inode_cachep);
741 kmem_cache_destroy(ceph_cap_cachep);
742 kmem_cache_destroy(ceph_cap_flush_cachep);
743 kmem_cache_destroy(ceph_dentry_cachep);
744 kmem_cache_destroy(ceph_file_cachep);
745
746 ceph_fscache_unregister();
747 }
748
749
750 /*
751 * ceph_umount_begin - initiate forced umount. Tear down down the
752 * mount, skipping steps that may hang while waiting for server(s).
753 */
754 static void ceph_umount_begin(struct super_block *sb)
755 {
756 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
757
758 dout("ceph_umount_begin - starting forced umount\n");
759 if (!fsc)
760 return;
761 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
762 ceph_mdsc_force_umount(fsc->mdsc);
763 return;
764 }
765
766 static const struct super_operations ceph_super_ops = {
767 .alloc_inode = ceph_alloc_inode,
768 .destroy_inode = ceph_destroy_inode,
769 .write_inode = ceph_write_inode,
770 .drop_inode = ceph_drop_inode,
771 .sync_fs = ceph_sync_fs,
772 .put_super = ceph_put_super,
773 .show_options = ceph_show_options,
774 .statfs = ceph_statfs,
775 .umount_begin = ceph_umount_begin,
776 };
777
778 /*
779 * Bootstrap mount by opening the root directory. Note the mount
780 * @started time from caller, and time out if this takes too long.
781 */
782 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
783 const char *path,
784 unsigned long started)
785 {
786 struct ceph_mds_client *mdsc = fsc->mdsc;
787 struct ceph_mds_request *req = NULL;
788 int err;
789 struct dentry *root;
790
791 /* open dir */
792 dout("open_root_inode opening '%s'\n", path);
793 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
794 if (IS_ERR(req))
795 return ERR_CAST(req);
796 req->r_path1 = kstrdup(path, GFP_NOFS);
797 if (!req->r_path1) {
798 root = ERR_PTR(-ENOMEM);
799 goto out;
800 }
801
802 req->r_ino1.ino = CEPH_INO_ROOT;
803 req->r_ino1.snap = CEPH_NOSNAP;
804 req->r_started = started;
805 req->r_timeout = fsc->client->options->mount_timeout;
806 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
807 req->r_num_caps = 2;
808 err = ceph_mdsc_do_request(mdsc, NULL, req);
809 if (err == 0) {
810 struct inode *inode = req->r_target_inode;
811 req->r_target_inode = NULL;
812 dout("open_root_inode success\n");
813 root = d_make_root(inode);
814 if (!root) {
815 root = ERR_PTR(-ENOMEM);
816 goto out;
817 }
818 dout("open_root_inode success, root dentry is %p\n", root);
819 } else {
820 root = ERR_PTR(err);
821 }
822 out:
823 ceph_mdsc_put_request(req);
824 return root;
825 }
826
827
828
829
830 /*
831 * mount: join the ceph cluster, and open root directory.
832 */
833 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
834 {
835 int err;
836 unsigned long started = jiffies; /* note the start time */
837 struct dentry *root;
838 int first = 0; /* first vfsmount for this super_block */
839
840 dout("mount start %p\n", fsc);
841 mutex_lock(&fsc->client->mount_mutex);
842
843 if (!fsc->sb->s_root) {
844 const char *path;
845 err = __ceph_open_session(fsc->client, started);
846 if (err < 0)
847 goto out;
848
849 /* setup fscache */
850 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
851 err = ceph_fscache_register_fs(fsc);
852 if (err < 0)
853 goto out;
854 }
855
856 if (!fsc->mount_options->server_path) {
857 path = "";
858 dout("mount opening path \\t\n");
859 } else {
860 path = fsc->mount_options->server_path + 1;
861 dout("mount opening path %s\n", path);
862 }
863 root = open_root_dentry(fsc, path, started);
864 if (IS_ERR(root)) {
865 err = PTR_ERR(root);
866 goto out;
867 }
868 fsc->sb->s_root = dget(root);
869 first = 1;
870
871 err = ceph_fs_debugfs_init(fsc);
872 if (err < 0)
873 goto fail;
874 } else {
875 root = dget(fsc->sb->s_root);
876 }
877
878 fsc->mount_state = CEPH_MOUNT_MOUNTED;
879 dout("mount success\n");
880 mutex_unlock(&fsc->client->mount_mutex);
881 return root;
882
883 fail:
884 if (first) {
885 dput(fsc->sb->s_root);
886 fsc->sb->s_root = NULL;
887 }
888 out:
889 mutex_unlock(&fsc->client->mount_mutex);
890 return ERR_PTR(err);
891 }
892
893 static int ceph_set_super(struct super_block *s, void *data)
894 {
895 struct ceph_fs_client *fsc = data;
896 int ret;
897
898 dout("set_super %p data %p\n", s, data);
899
900 s->s_flags = fsc->mount_options->sb_flags;
901 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
902
903 s->s_xattr = ceph_xattr_handlers;
904 s->s_fs_info = fsc;
905 fsc->sb = s;
906
907 s->s_op = &ceph_super_ops;
908 s->s_d_op = &ceph_dentry_ops;
909 s->s_export_op = &ceph_export_ops;
910
911 s->s_time_gran = 1000; /* 1000 ns == 1 us */
912
913 ret = set_anon_super(s, NULL); /* what is that second arg for? */
914 if (ret != 0)
915 goto fail;
916
917 return ret;
918
919 fail:
920 s->s_fs_info = NULL;
921 fsc->sb = NULL;
922 return ret;
923 }
924
925 /*
926 * share superblock if same fs AND options
927 */
928 static int ceph_compare_super(struct super_block *sb, void *data)
929 {
930 struct ceph_fs_client *new = data;
931 struct ceph_mount_options *fsopt = new->mount_options;
932 struct ceph_options *opt = new->client->options;
933 struct ceph_fs_client *other = ceph_sb_to_client(sb);
934
935 dout("ceph_compare_super %p\n", sb);
936
937 if (compare_mount_options(fsopt, opt, other)) {
938 dout("monitor(s)/mount options don't match\n");
939 return 0;
940 }
941 if ((opt->flags & CEPH_OPT_FSID) &&
942 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
943 dout("fsid doesn't match\n");
944 return 0;
945 }
946 if (fsopt->sb_flags != other->mount_options->sb_flags) {
947 dout("flags differ\n");
948 return 0;
949 }
950 return 1;
951 }
952
953 /*
954 * construct our own bdi so we can control readahead, etc.
955 */
956 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
957
958 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
959 {
960 int err;
961
962 err = super_setup_bdi_name(sb, "ceph-%ld",
963 atomic_long_inc_return(&bdi_seq));
964 if (err)
965 return err;
966
967 /* set ra_pages based on rasize mount option? */
968 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
969
970 /* set io_pages based on max osd read size */
971 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
972
973 return 0;
974 }
975
976 static struct dentry *ceph_mount(struct file_system_type *fs_type,
977 int flags, const char *dev_name, void *data)
978 {
979 struct super_block *sb;
980 struct ceph_fs_client *fsc;
981 struct dentry *res;
982 int err;
983 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
984 struct ceph_mount_options *fsopt = NULL;
985 struct ceph_options *opt = NULL;
986
987 dout("ceph_mount\n");
988
989 #ifdef CONFIG_CEPH_FS_POSIX_ACL
990 flags |= MS_POSIXACL;
991 #endif
992 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
993 if (err < 0) {
994 res = ERR_PTR(err);
995 goto out_final;
996 }
997
998 /* create client (which we may/may not use) */
999 fsc = create_fs_client(fsopt, opt);
1000 if (IS_ERR(fsc)) {
1001 res = ERR_CAST(fsc);
1002 destroy_mount_options(fsopt);
1003 ceph_destroy_options(opt);
1004 goto out_final;
1005 }
1006
1007 err = ceph_mdsc_init(fsc);
1008 if (err < 0) {
1009 res = ERR_PTR(err);
1010 goto out;
1011 }
1012
1013 if (ceph_test_opt(fsc->client, NOSHARE))
1014 compare_super = NULL;
1015 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1016 if (IS_ERR(sb)) {
1017 res = ERR_CAST(sb);
1018 goto out;
1019 }
1020
1021 if (ceph_sb_to_client(sb) != fsc) {
1022 ceph_mdsc_destroy(fsc);
1023 destroy_fs_client(fsc);
1024 fsc = ceph_sb_to_client(sb);
1025 dout("get_sb got existing client %p\n", fsc);
1026 } else {
1027 dout("get_sb using new client %p\n", fsc);
1028 err = ceph_setup_bdi(sb, fsc);
1029 if (err < 0) {
1030 res = ERR_PTR(err);
1031 goto out_splat;
1032 }
1033 }
1034
1035 res = ceph_real_mount(fsc);
1036 if (IS_ERR(res))
1037 goto out_splat;
1038 dout("root %p inode %p ino %llx.%llx\n", res,
1039 d_inode(res), ceph_vinop(d_inode(res)));
1040 return res;
1041
1042 out_splat:
1043 ceph_mdsc_close_sessions(fsc->mdsc);
1044 deactivate_locked_super(sb);
1045 goto out_final;
1046
1047 out:
1048 ceph_mdsc_destroy(fsc);
1049 destroy_fs_client(fsc);
1050 out_final:
1051 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1052 return res;
1053 }
1054
1055 static void ceph_kill_sb(struct super_block *s)
1056 {
1057 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1058 dev_t dev = s->s_dev;
1059
1060 dout("kill_sb %p\n", s);
1061
1062 ceph_mdsc_pre_umount(fsc->mdsc);
1063 generic_shutdown_super(s);
1064
1065 fsc->client->extra_mon_dispatch = NULL;
1066 ceph_fs_debugfs_cleanup(fsc);
1067
1068 ceph_fscache_unregister_fs(fsc);
1069
1070 ceph_mdsc_destroy(fsc);
1071
1072 destroy_fs_client(fsc);
1073 free_anon_bdev(dev);
1074 }
1075
1076 static struct file_system_type ceph_fs_type = {
1077 .owner = THIS_MODULE,
1078 .name = "ceph",
1079 .mount = ceph_mount,
1080 .kill_sb = ceph_kill_sb,
1081 .fs_flags = FS_RENAME_DOES_D_MOVE,
1082 };
1083 MODULE_ALIAS_FS("ceph");
1084
1085 static int __init init_ceph(void)
1086 {
1087 int ret = init_caches();
1088 if (ret)
1089 goto out;
1090
1091 ceph_flock_init();
1092 ceph_xattr_init();
1093 ret = register_filesystem(&ceph_fs_type);
1094 if (ret)
1095 goto out_xattr;
1096
1097 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1098
1099 return 0;
1100
1101 out_xattr:
1102 ceph_xattr_exit();
1103 destroy_caches();
1104 out:
1105 return ret;
1106 }
1107
1108 static void __exit exit_ceph(void)
1109 {
1110 dout("exit_ceph\n");
1111 unregister_filesystem(&ceph_fs_type);
1112 ceph_xattr_exit();
1113 destroy_caches();
1114 }
1115
1116 module_init(init_ceph);
1117 module_exit(exit_ceph);
1118
1119 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1120 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1121 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1122 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1123 MODULE_LICENSE("GPL");
Linux with added FPC-III support