Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 */
37static 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
45static 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_mon_client *monc = &fsc->client->monc;
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(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
80 /*
81 * By default use root quota for stats; fallback to overall filesystem
82 * usage if using 'noquotadf' mount option or if the root dir doesn't
83 * have max_bytes quota set.
84 */
85 if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
86 !ceph_quota_update_statfs(fsc, buf)) {
87 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
88 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
89 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
90 }
91
92 buf->f_files = le64_to_cpu(st.num_objects);
93 buf->f_ffree = -1;
94 buf->f_namelen = NAME_MAX;
95
96 /* Must convert the fsid, for consistent values across arches */
97 mutex_lock(&monc->mutex);
98 fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
99 le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
100 mutex_unlock(&monc->mutex);
101
102 buf->f_fsid.val[0] = fsid & 0xffffffff;
103 buf->f_fsid.val[1] = fsid >> 32;
104
105 return 0;
106}
107
108
109static int ceph_sync_fs(struct super_block *sb, int wait)
110{
111 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
112
113 if (!wait) {
114 dout("sync_fs (non-blocking)\n");
115 ceph_flush_dirty_caps(fsc->mdsc);
116 dout("sync_fs (non-blocking) done\n");
117 return 0;
118 }
119
120 dout("sync_fs (blocking)\n");
121 ceph_osdc_sync(&fsc->client->osdc);
122 ceph_mdsc_sync(fsc->mdsc);
123 dout("sync_fs (blocking) done\n");
124 return 0;
125}
126
127/*
128 * mount options
129 */
130enum {
131 Opt_wsize,
132 Opt_rsize,
133 Opt_rasize,
134 Opt_caps_wanted_delay_min,
135 Opt_caps_wanted_delay_max,
136 Opt_readdir_max_entries,
137 Opt_readdir_max_bytes,
138 Opt_congestion_kb,
139 Opt_last_int,
140 /* int args above */
141 Opt_snapdirname,
142 Opt_mds_namespace,
143 Opt_fscache_uniq,
144 Opt_last_string,
145 /* string args above */
146 Opt_dirstat,
147 Opt_nodirstat,
148 Opt_rbytes,
149 Opt_norbytes,
150 Opt_asyncreaddir,
151 Opt_noasyncreaddir,
152 Opt_dcache,
153 Opt_nodcache,
154 Opt_ino32,
155 Opt_noino32,
156 Opt_fscache,
157 Opt_nofscache,
158 Opt_poolperm,
159 Opt_nopoolperm,
160 Opt_require_active_mds,
161 Opt_norequire_active_mds,
162#ifdef CONFIG_CEPH_FS_POSIX_ACL
163 Opt_acl,
164#endif
165 Opt_noacl,
166 Opt_quotadf,
167 Opt_noquotadf,
168 Opt_copyfrom,
169 Opt_nocopyfrom,
170};
171
172static match_table_t fsopt_tokens = {
173 {Opt_wsize, "wsize=%d"},
174 {Opt_rsize, "rsize=%d"},
175 {Opt_rasize, "rasize=%d"},
176 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
177 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
178 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
179 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
180 {Opt_congestion_kb, "write_congestion_kb=%d"},
181 /* int args above */
182 {Opt_snapdirname, "snapdirname=%s"},
183 {Opt_mds_namespace, "mds_namespace=%s"},
184 {Opt_fscache_uniq, "fsc=%s"},
185 /* string args above */
186 {Opt_dirstat, "dirstat"},
187 {Opt_nodirstat, "nodirstat"},
188 {Opt_rbytes, "rbytes"},
189 {Opt_norbytes, "norbytes"},
190 {Opt_asyncreaddir, "asyncreaddir"},
191 {Opt_noasyncreaddir, "noasyncreaddir"},
192 {Opt_dcache, "dcache"},
193 {Opt_nodcache, "nodcache"},
194 {Opt_ino32, "ino32"},
195 {Opt_noino32, "noino32"},
196 {Opt_fscache, "fsc"},
197 {Opt_nofscache, "nofsc"},
198 {Opt_poolperm, "poolperm"},
199 {Opt_nopoolperm, "nopoolperm"},
200 {Opt_require_active_mds, "require_active_mds"},
201 {Opt_norequire_active_mds, "norequire_active_mds"},
202#ifdef CONFIG_CEPH_FS_POSIX_ACL
203 {Opt_acl, "acl"},
204#endif
205 {Opt_noacl, "noacl"},
206 {Opt_quotadf, "quotadf"},
207 {Opt_noquotadf, "noquotadf"},
208 {Opt_copyfrom, "copyfrom"},
209 {Opt_nocopyfrom, "nocopyfrom"},
210 {-1, NULL}
211};
212
213static int parse_fsopt_token(char *c, void *private)
214{
215 struct ceph_mount_options *fsopt = private;
216 substring_t argstr[MAX_OPT_ARGS];
217 int token, intval, ret;
218
219 token = match_token((char *)c, fsopt_tokens, argstr);
220 if (token < 0)
221 return -EINVAL;
222
223 if (token < Opt_last_int) {
224 ret = match_int(&argstr[0], &intval);
225 if (ret < 0) {
226 pr_err("bad option arg (not int) at '%s'\n", c);
227 return ret;
228 }
229 dout("got int token %d val %d\n", token, intval);
230 } else if (token > Opt_last_int && token < Opt_last_string) {
231 dout("got string token %d val %s\n", token,
232 argstr[0].from);
233 } else {
234 dout("got token %d\n", token);
235 }
236
237 switch (token) {
238 case Opt_snapdirname:
239 kfree(fsopt->snapdir_name);
240 fsopt->snapdir_name = kstrndup(argstr[0].from,
241 argstr[0].to-argstr[0].from,
242 GFP_KERNEL);
243 if (!fsopt->snapdir_name)
244 return -ENOMEM;
245 break;
246 case Opt_mds_namespace:
247 kfree(fsopt->mds_namespace);
248 fsopt->mds_namespace = kstrndup(argstr[0].from,
249 argstr[0].to-argstr[0].from,
250 GFP_KERNEL);
251 if (!fsopt->mds_namespace)
252 return -ENOMEM;
253 break;
254 case Opt_fscache_uniq:
255 kfree(fsopt->fscache_uniq);
256 fsopt->fscache_uniq = kstrndup(argstr[0].from,
257 argstr[0].to-argstr[0].from,
258 GFP_KERNEL);
259 if (!fsopt->fscache_uniq)
260 return -ENOMEM;
261 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
262 break;
263 /* misc */
264 case Opt_wsize:
265 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
266 return -EINVAL;
267 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
268 break;
269 case Opt_rsize:
270 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
271 return -EINVAL;
272 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
273 break;
274 case Opt_rasize:
275 if (intval < 0)
276 return -EINVAL;
277 fsopt->rasize = ALIGN(intval, PAGE_SIZE);
278 break;
279 case Opt_caps_wanted_delay_min:
280 if (intval < 1)
281 return -EINVAL;
282 fsopt->caps_wanted_delay_min = intval;
283 break;
284 case Opt_caps_wanted_delay_max:
285 if (intval < 1)
286 return -EINVAL;
287 fsopt->caps_wanted_delay_max = intval;
288 break;
289 case Opt_readdir_max_entries:
290 if (intval < 1)
291 return -EINVAL;
292 fsopt->max_readdir = intval;
293 break;
294 case Opt_readdir_max_bytes:
295 if (intval < (int)PAGE_SIZE && intval != 0)
296 return -EINVAL;
297 fsopt->max_readdir_bytes = intval;
298 break;
299 case Opt_congestion_kb:
300 if (intval < 1024) /* at least 1M */
301 return -EINVAL;
302 fsopt->congestion_kb = intval;
303 break;
304 case Opt_dirstat:
305 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
306 break;
307 case Opt_nodirstat:
308 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
309 break;
310 case Opt_rbytes:
311 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
312 break;
313 case Opt_norbytes:
314 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
315 break;
316 case Opt_asyncreaddir:
317 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
318 break;
319 case Opt_noasyncreaddir:
320 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
321 break;
322 case Opt_dcache:
323 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
324 break;
325 case Opt_nodcache:
326 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
327 break;
328 case Opt_ino32:
329 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
330 break;
331 case Opt_noino32:
332 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
333 break;
334 case Opt_fscache:
335 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
336 kfree(fsopt->fscache_uniq);
337 fsopt->fscache_uniq = NULL;
338 break;
339 case Opt_nofscache:
340 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
341 kfree(fsopt->fscache_uniq);
342 fsopt->fscache_uniq = NULL;
343 break;
344 case Opt_poolperm:
345 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
346 break;
347 case Opt_nopoolperm:
348 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
349 break;
350 case Opt_require_active_mds:
351 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
352 break;
353 case Opt_norequire_active_mds:
354 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
355 break;
356 case Opt_quotadf:
357 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
358 break;
359 case Opt_noquotadf:
360 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
361 break;
362 case Opt_copyfrom:
363 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
364 break;
365 case Opt_nocopyfrom:
366 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
367 break;
368#ifdef CONFIG_CEPH_FS_POSIX_ACL
369 case Opt_acl:
370 fsopt->sb_flags |= SB_POSIXACL;
371 break;
372#endif
373 case Opt_noacl:
374 fsopt->sb_flags &= ~SB_POSIXACL;
375 break;
376 default:
377 BUG_ON(token);
378 }
379 return 0;
380}
381
382static void destroy_mount_options(struct ceph_mount_options *args)
383{
384 dout("destroy_mount_options %p\n", args);
385 kfree(args->snapdir_name);
386 kfree(args->mds_namespace);
387 kfree(args->server_path);
388 kfree(args->fscache_uniq);
389 kfree(args);
390}
391
392static int strcmp_null(const char *s1, const char *s2)
393{
394 if (!s1 && !s2)
395 return 0;
396 if (s1 && !s2)
397 return -1;
398 if (!s1 && s2)
399 return 1;
400 return strcmp(s1, s2);
401}
402
403static int compare_mount_options(struct ceph_mount_options *new_fsopt,
404 struct ceph_options *new_opt,
405 struct ceph_fs_client *fsc)
406{
407 struct ceph_mount_options *fsopt1 = new_fsopt;
408 struct ceph_mount_options *fsopt2 = fsc->mount_options;
409 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
410 int ret;
411
412 ret = memcmp(fsopt1, fsopt2, ofs);
413 if (ret)
414 return ret;
415
416 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
417 if (ret)
418 return ret;
419 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
420 if (ret)
421 return ret;
422 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
423 if (ret)
424 return ret;
425 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
426 if (ret)
427 return ret;
428
429 return ceph_compare_options(new_opt, fsc->client);
430}
431
432static int parse_mount_options(struct ceph_mount_options **pfsopt,
433 struct ceph_options **popt,
434 int flags, char *options,
435 const char *dev_name)
436{
437 struct ceph_mount_options *fsopt;
438 const char *dev_name_end;
439 int err;
440
441 if (!dev_name || !*dev_name)
442 return -EINVAL;
443
444 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
445 if (!fsopt)
446 return -ENOMEM;
447
448 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
449
450 fsopt->sb_flags = flags;
451 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
452
453 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
454 fsopt->rsize = CEPH_MAX_READ_SIZE;
455 fsopt->rasize = CEPH_RASIZE_DEFAULT;
456 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
457 if (!fsopt->snapdir_name) {
458 err = -ENOMEM;
459 goto out;
460 }
461
462 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
463 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
464 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
465 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
466 fsopt->congestion_kb = default_congestion_kb();
467
468 /*
469 * Distinguish the server list from the path in "dev_name".
470 * Internally we do not include the leading '/' in the path.
471 *
472 * "dev_name" will look like:
473 * <server_spec>[,<server_spec>...]:[<path>]
474 * where
475 * <server_spec> is <ip>[:<port>]
476 * <path> is optional, but if present must begin with '/'
477 */
478 dev_name_end = strchr(dev_name, '/');
479 if (dev_name_end) {
480 if (strlen(dev_name_end) > 1) {
481 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
482 if (!fsopt->server_path) {
483 err = -ENOMEM;
484 goto out;
485 }
486 }
487 } else {
488 dev_name_end = dev_name + strlen(dev_name);
489 }
490 err = -EINVAL;
491 dev_name_end--; /* back up to ':' separator */
492 if (dev_name_end < dev_name || *dev_name_end != ':') {
493 pr_err("device name is missing path (no : separator in %s)\n",
494 dev_name);
495 goto out;
496 }
497 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
498 if (fsopt->server_path)
499 dout("server path '%s'\n", fsopt->server_path);
500
501 *popt = ceph_parse_options(options, dev_name, dev_name_end,
502 parse_fsopt_token, (void *)fsopt);
503 if (IS_ERR(*popt)) {
504 err = PTR_ERR(*popt);
505 goto out;
506 }
507
508 /* success */
509 *pfsopt = fsopt;
510 return 0;
511
512out:
513 destroy_mount_options(fsopt);
514 return err;
515}
516
517/**
518 * ceph_show_options - Show mount options in /proc/mounts
519 * @m: seq_file to write to
520 * @root: root of that (sub)tree
521 */
522static int ceph_show_options(struct seq_file *m, struct dentry *root)
523{
524 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
525 struct ceph_mount_options *fsopt = fsc->mount_options;
526 size_t pos;
527 int ret;
528
529 /* a comma between MNT/MS and client options */
530 seq_putc(m, ',');
531 pos = m->count;
532
533 ret = ceph_print_client_options(m, fsc->client, false);
534 if (ret)
535 return ret;
536
537 /* retract our comma if no client options */
538 if (m->count == pos)
539 m->count--;
540
541 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
542 seq_puts(m, ",dirstat");
543 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
544 seq_puts(m, ",rbytes");
545 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
546 seq_puts(m, ",noasyncreaddir");
547 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
548 seq_puts(m, ",nodcache");
549 if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
550 seq_puts(m, ",ino32");
551 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
552 seq_show_option(m, "fsc", fsopt->fscache_uniq);
553 }
554 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
555 seq_puts(m, ",nopoolperm");
556 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
557 seq_puts(m, ",noquotadf");
558
559#ifdef CONFIG_CEPH_FS_POSIX_ACL
560 if (fsopt->sb_flags & SB_POSIXACL)
561 seq_puts(m, ",acl");
562 else
563 seq_puts(m, ",noacl");
564#endif
565
566 if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
567 seq_puts(m, ",copyfrom");
568
569 if (fsopt->mds_namespace)
570 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
571 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
572 seq_printf(m, ",wsize=%d", fsopt->wsize);
573 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
574 seq_printf(m, ",rsize=%d", fsopt->rsize);
575 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
576 seq_printf(m, ",rasize=%d", fsopt->rasize);
577 if (fsopt->congestion_kb != default_congestion_kb())
578 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
579 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
580 seq_printf(m, ",caps_wanted_delay_min=%d",
581 fsopt->caps_wanted_delay_min);
582 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
583 seq_printf(m, ",caps_wanted_delay_max=%d",
584 fsopt->caps_wanted_delay_max);
585 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
586 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
587 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
588 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
589 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
590 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
591
592 return 0;
593}
594
595/*
596 * handle any mon messages the standard library doesn't understand.
597 * return error if we don't either.
598 */
599static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
600{
601 struct ceph_fs_client *fsc = client->private;
602 int type = le16_to_cpu(msg->hdr.type);
603
604 switch (type) {
605 case CEPH_MSG_MDS_MAP:
606 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
607 return 0;
608 case CEPH_MSG_FS_MAP_USER:
609 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
610 return 0;
611 default:
612 return -1;
613 }
614}
615
616/*
617 * create a new fs client
618 *
619 * Success or not, this function consumes @fsopt and @opt.
620 */
621static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
622 struct ceph_options *opt)
623{
624 struct ceph_fs_client *fsc;
625 int page_count;
626 size_t size;
627 int err;
628
629 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
630 if (!fsc) {
631 err = -ENOMEM;
632 goto fail;
633 }
634
635 fsc->client = ceph_create_client(opt, fsc);
636 if (IS_ERR(fsc->client)) {
637 err = PTR_ERR(fsc->client);
638 goto fail;
639 }
640 opt = NULL; /* fsc->client now owns this */
641
642 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
643 ceph_set_opt(fsc->client, ABORT_ON_FULL);
644
645 if (!fsopt->mds_namespace) {
646 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
647 0, true);
648 } else {
649 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
650 0, false);
651 }
652
653 fsc->mount_options = fsopt;
654
655 fsc->sb = NULL;
656 fsc->mount_state = CEPH_MOUNT_MOUNTING;
657
658 atomic_long_set(&fsc->writeback_count, 0);
659
660 err = -ENOMEM;
661 /*
662 * The number of concurrent works can be high but they don't need
663 * to be processed in parallel, limit concurrency.
664 */
665 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
666 if (!fsc->wb_wq)
667 goto fail_client;
668 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
669 if (!fsc->pg_inv_wq)
670 goto fail_wb_wq;
671 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
672 if (!fsc->trunc_wq)
673 goto fail_pg_inv_wq;
674
675 /* set up mempools */
676 err = -ENOMEM;
677 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
678 size = sizeof (struct page *) * (page_count ? page_count : 1);
679 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
680 if (!fsc->wb_pagevec_pool)
681 goto fail_trunc_wq;
682
683 /* caps */
684 fsc->min_caps = fsopt->max_readdir;
685
686 return fsc;
687
688fail_trunc_wq:
689 destroy_workqueue(fsc->trunc_wq);
690fail_pg_inv_wq:
691 destroy_workqueue(fsc->pg_inv_wq);
692fail_wb_wq:
693 destroy_workqueue(fsc->wb_wq);
694fail_client:
695 ceph_destroy_client(fsc->client);
696fail:
697 kfree(fsc);
698 if (opt)
699 ceph_destroy_options(opt);
700 destroy_mount_options(fsopt);
701 return ERR_PTR(err);
702}
703
704static void flush_fs_workqueues(struct ceph_fs_client *fsc)
705{
706 flush_workqueue(fsc->wb_wq);
707 flush_workqueue(fsc->pg_inv_wq);
708 flush_workqueue(fsc->trunc_wq);
709}
710
711static void destroy_fs_client(struct ceph_fs_client *fsc)
712{
713 dout("destroy_fs_client %p\n", fsc);
714
715 destroy_workqueue(fsc->wb_wq);
716 destroy_workqueue(fsc->pg_inv_wq);
717 destroy_workqueue(fsc->trunc_wq);
718
719 mempool_destroy(fsc->wb_pagevec_pool);
720
721 destroy_mount_options(fsc->mount_options);
722
723 ceph_destroy_client(fsc->client);
724
725 kfree(fsc);
726 dout("destroy_fs_client %p done\n", fsc);
727}
728
729/*
730 * caches
731 */
732struct kmem_cache *ceph_inode_cachep;
733struct kmem_cache *ceph_cap_cachep;
734struct kmem_cache *ceph_cap_flush_cachep;
735struct kmem_cache *ceph_dentry_cachep;
736struct kmem_cache *ceph_file_cachep;
737struct kmem_cache *ceph_dir_file_cachep;
738
739static void ceph_inode_init_once(void *foo)
740{
741 struct ceph_inode_info *ci = foo;
742 inode_init_once(&ci->vfs_inode);
743}
744
745static int __init init_caches(void)
746{
747 int error = -ENOMEM;
748
749 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
750 sizeof(struct ceph_inode_info),
751 __alignof__(struct ceph_inode_info),
752 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
753 SLAB_ACCOUNT, ceph_inode_init_once);
754 if (!ceph_inode_cachep)
755 return -ENOMEM;
756
757 ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
758 if (!ceph_cap_cachep)
759 goto bad_cap;
760 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
761 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
762 if (!ceph_cap_flush_cachep)
763 goto bad_cap_flush;
764
765 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
766 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
767 if (!ceph_dentry_cachep)
768 goto bad_dentry;
769
770 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
771 if (!ceph_file_cachep)
772 goto bad_file;
773
774 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
775 if (!ceph_dir_file_cachep)
776 goto bad_dir_file;
777
778 error = ceph_fscache_register();
779 if (error)
780 goto bad_fscache;
781
782 return 0;
783
784bad_fscache:
785 kmem_cache_destroy(ceph_dir_file_cachep);
786bad_dir_file:
787 kmem_cache_destroy(ceph_file_cachep);
788bad_file:
789 kmem_cache_destroy(ceph_dentry_cachep);
790bad_dentry:
791 kmem_cache_destroy(ceph_cap_flush_cachep);
792bad_cap_flush:
793 kmem_cache_destroy(ceph_cap_cachep);
794bad_cap:
795 kmem_cache_destroy(ceph_inode_cachep);
796 return error;
797}
798
799static void destroy_caches(void)
800{
801 /*
802 * Make sure all delayed rcu free inodes are flushed before we
803 * destroy cache.
804 */
805 rcu_barrier();
806
807 kmem_cache_destroy(ceph_inode_cachep);
808 kmem_cache_destroy(ceph_cap_cachep);
809 kmem_cache_destroy(ceph_cap_flush_cachep);
810 kmem_cache_destroy(ceph_dentry_cachep);
811 kmem_cache_destroy(ceph_file_cachep);
812 kmem_cache_destroy(ceph_dir_file_cachep);
813
814 ceph_fscache_unregister();
815}
816
817
818/*
819 * ceph_umount_begin - initiate forced umount. Tear down down the
820 * mount, skipping steps that may hang while waiting for server(s).
821 */
822static void ceph_umount_begin(struct super_block *sb)
823{
824 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
825
826 dout("ceph_umount_begin - starting forced umount\n");
827 if (!fsc)
828 return;
829 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
830 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
831 ceph_mdsc_force_umount(fsc->mdsc);
832 return;
833}
834
835static const struct super_operations ceph_super_ops = {
836 .alloc_inode = ceph_alloc_inode,
837 .destroy_inode = ceph_destroy_inode,
838 .write_inode = ceph_write_inode,
839 .drop_inode = ceph_drop_inode,
840 .sync_fs = ceph_sync_fs,
841 .put_super = ceph_put_super,
842 .show_options = ceph_show_options,
843 .statfs = ceph_statfs,
844 .umount_begin = ceph_umount_begin,
845};
846
847/*
848 * Bootstrap mount by opening the root directory. Note the mount
849 * @started time from caller, and time out if this takes too long.
850 */
851static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
852 const char *path,
853 unsigned long started)
854{
855 struct ceph_mds_client *mdsc = fsc->mdsc;
856 struct ceph_mds_request *req = NULL;
857 int err;
858 struct dentry *root;
859
860 /* open dir */
861 dout("open_root_inode opening '%s'\n", path);
862 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
863 if (IS_ERR(req))
864 return ERR_CAST(req);
865 req->r_path1 = kstrdup(path, GFP_NOFS);
866 if (!req->r_path1) {
867 root = ERR_PTR(-ENOMEM);
868 goto out;
869 }
870
871 req->r_ino1.ino = CEPH_INO_ROOT;
872 req->r_ino1.snap = CEPH_NOSNAP;
873 req->r_started = started;
874 req->r_timeout = fsc->client->options->mount_timeout;
875 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
876 req->r_num_caps = 2;
877 err = ceph_mdsc_do_request(mdsc, NULL, req);
878 if (err == 0) {
879 struct inode *inode = req->r_target_inode;
880 req->r_target_inode = NULL;
881 dout("open_root_inode success\n");
882 root = d_make_root(inode);
883 if (!root) {
884 root = ERR_PTR(-ENOMEM);
885 goto out;
886 }
887 dout("open_root_inode success, root dentry is %p\n", root);
888 } else {
889 root = ERR_PTR(err);
890 }
891out:
892 ceph_mdsc_put_request(req);
893 return root;
894}
895
896
897
898
899/*
900 * mount: join the ceph cluster, and open root directory.
901 */
902static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
903{
904 int err;
905 unsigned long started = jiffies; /* note the start time */
906 struct dentry *root;
907
908 dout("mount start %p\n", fsc);
909 mutex_lock(&fsc->client->mount_mutex);
910
911 if (!fsc->sb->s_root) {
912 const char *path;
913 err = __ceph_open_session(fsc->client, started);
914 if (err < 0)
915 goto out;
916
917 /* setup fscache */
918 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
919 err = ceph_fscache_register_fs(fsc);
920 if (err < 0)
921 goto out;
922 }
923
924 if (!fsc->mount_options->server_path) {
925 path = "";
926 dout("mount opening path \\t\n");
927 } else {
928 path = fsc->mount_options->server_path + 1;
929 dout("mount opening path %s\n", path);
930 }
931
932 err = ceph_fs_debugfs_init(fsc);
933 if (err < 0)
934 goto out;
935
936 root = open_root_dentry(fsc, path, started);
937 if (IS_ERR(root)) {
938 err = PTR_ERR(root);
939 goto out;
940 }
941 fsc->sb->s_root = dget(root);
942 } else {
943 root = dget(fsc->sb->s_root);
944 }
945
946 fsc->mount_state = CEPH_MOUNT_MOUNTED;
947 dout("mount success\n");
948 mutex_unlock(&fsc->client->mount_mutex);
949 return root;
950
951out:
952 mutex_unlock(&fsc->client->mount_mutex);
953 return ERR_PTR(err);
954}
955
956static int ceph_set_super(struct super_block *s, void *data)
957{
958 struct ceph_fs_client *fsc = data;
959 int ret;
960
961 dout("set_super %p data %p\n", s, data);
962
963 s->s_flags = fsc->mount_options->sb_flags;
964 s->s_maxbytes = MAX_LFS_FILESIZE;
965
966 s->s_xattr = ceph_xattr_handlers;
967 s->s_fs_info = fsc;
968 fsc->sb = s;
969 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
970
971 s->s_op = &ceph_super_ops;
972 s->s_d_op = &ceph_dentry_ops;
973 s->s_export_op = &ceph_export_ops;
974
975 s->s_time_gran = 1000; /* 1000 ns == 1 us */
976
977 ret = set_anon_super(s, NULL); /* what is that second arg for? */
978 if (ret != 0)
979 goto fail;
980
981 return ret;
982
983fail:
984 s->s_fs_info = NULL;
985 fsc->sb = NULL;
986 return ret;
987}
988
989/*
990 * share superblock if same fs AND options
991 */
992static int ceph_compare_super(struct super_block *sb, void *data)
993{
994 struct ceph_fs_client *new = data;
995 struct ceph_mount_options *fsopt = new->mount_options;
996 struct ceph_options *opt = new->client->options;
997 struct ceph_fs_client *other = ceph_sb_to_client(sb);
998
999 dout("ceph_compare_super %p\n", sb);
1000
1001 if (compare_mount_options(fsopt, opt, other)) {
1002 dout("monitor(s)/mount options don't match\n");
1003 return 0;
1004 }
1005 if ((opt->flags & CEPH_OPT_FSID) &&
1006 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1007 dout("fsid doesn't match\n");
1008 return 0;
1009 }
1010 if (fsopt->sb_flags != other->mount_options->sb_flags) {
1011 dout("flags differ\n");
1012 return 0;
1013 }
1014 return 1;
1015}
1016
1017/*
1018 * construct our own bdi so we can control readahead, etc.
1019 */
1020static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1021
1022static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1023{
1024 int err;
1025
1026 err = super_setup_bdi_name(sb, "ceph-%ld",
1027 atomic_long_inc_return(&bdi_seq));
1028 if (err)
1029 return err;
1030
1031 /* set ra_pages based on rasize mount option? */
1032 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1033
1034 /* set io_pages based on max osd read size */
1035 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1036
1037 return 0;
1038}
1039
1040static struct dentry *ceph_mount(struct file_system_type *fs_type,
1041 int flags, const char *dev_name, void *data)
1042{
1043 struct super_block *sb;
1044 struct ceph_fs_client *fsc;
1045 struct dentry *res;
1046 int err;
1047 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1048 struct ceph_mount_options *fsopt = NULL;
1049 struct ceph_options *opt = NULL;
1050
1051 dout("ceph_mount\n");
1052
1053#ifdef CONFIG_CEPH_FS_POSIX_ACL
1054 flags |= SB_POSIXACL;
1055#endif
1056 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1057 if (err < 0) {
1058 res = ERR_PTR(err);
1059 goto out_final;
1060 }
1061
1062 /* create client (which we may/may not use) */
1063 fsc = create_fs_client(fsopt, opt);
1064 if (IS_ERR(fsc)) {
1065 res = ERR_CAST(fsc);
1066 goto out_final;
1067 }
1068
1069 err = ceph_mdsc_init(fsc);
1070 if (err < 0) {
1071 res = ERR_PTR(err);
1072 goto out;
1073 }
1074
1075 if (ceph_test_opt(fsc->client, NOSHARE))
1076 compare_super = NULL;
1077 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1078 if (IS_ERR(sb)) {
1079 res = ERR_CAST(sb);
1080 goto out;
1081 }
1082
1083 if (ceph_sb_to_client(sb) != fsc) {
1084 ceph_mdsc_destroy(fsc);
1085 destroy_fs_client(fsc);
1086 fsc = ceph_sb_to_client(sb);
1087 dout("get_sb got existing client %p\n", fsc);
1088 } else {
1089 dout("get_sb using new client %p\n", fsc);
1090 err = ceph_setup_bdi(sb, fsc);
1091 if (err < 0) {
1092 res = ERR_PTR(err);
1093 goto out_splat;
1094 }
1095 }
1096
1097 res = ceph_real_mount(fsc);
1098 if (IS_ERR(res))
1099 goto out_splat;
1100 dout("root %p inode %p ino %llx.%llx\n", res,
1101 d_inode(res), ceph_vinop(d_inode(res)));
1102 return res;
1103
1104out_splat:
1105 ceph_mdsc_close_sessions(fsc->mdsc);
1106 deactivate_locked_super(sb);
1107 goto out_final;
1108
1109out:
1110 ceph_mdsc_destroy(fsc);
1111 destroy_fs_client(fsc);
1112out_final:
1113 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1114 return res;
1115}
1116
1117static void ceph_kill_sb(struct super_block *s)
1118{
1119 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1120 dev_t dev = s->s_dev;
1121
1122 dout("kill_sb %p\n", s);
1123
1124 ceph_mdsc_pre_umount(fsc->mdsc);
1125 flush_fs_workqueues(fsc);
1126
1127 generic_shutdown_super(s);
1128
1129 fsc->client->extra_mon_dispatch = NULL;
1130 ceph_fs_debugfs_cleanup(fsc);
1131
1132 ceph_fscache_unregister_fs(fsc);
1133
1134 ceph_mdsc_destroy(fsc);
1135
1136 destroy_fs_client(fsc);
1137 free_anon_bdev(dev);
1138}
1139
1140static struct file_system_type ceph_fs_type = {
1141 .owner = THIS_MODULE,
1142 .name = "ceph",
1143 .mount = ceph_mount,
1144 .kill_sb = ceph_kill_sb,
1145 .fs_flags = FS_RENAME_DOES_D_MOVE,
1146};
1147MODULE_ALIAS_FS("ceph");
1148
1149static int __init init_ceph(void)
1150{
1151 int ret = init_caches();
1152 if (ret)
1153 goto out;
1154
1155 ceph_flock_init();
1156 ceph_xattr_init();
1157 ret = register_filesystem(&ceph_fs_type);
1158 if (ret)
1159 goto out_xattr;
1160
1161 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1162
1163 return 0;
1164
1165out_xattr:
1166 ceph_xattr_exit();
1167 destroy_caches();
1168out:
1169 return ret;
1170}
1171
1172static void __exit exit_ceph(void)
1173{
1174 dout("exit_ceph\n");
1175 unregister_filesystem(&ceph_fs_type);
1176 ceph_xattr_exit();
1177 destroy_caches();
1178}
1179
1180module_init(init_ceph);
1181module_exit(exit_ceph);
1182
1183MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1184MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1185MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1186MODULE_DESCRIPTION("Ceph filesystem for Linux");
1187MODULE_LICENSE("GPL");