tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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_caps_max,
137 Opt_readdir_max_entries,
138 Opt_readdir_max_bytes,
139 Opt_congestion_kb,
140 Opt_last_int,
141 /* int args above */
142 Opt_snapdirname,
143 Opt_mds_namespace,
144 Opt_fscache_uniq,
145 Opt_last_string,
146 /* string args above */
147 Opt_dirstat,
148 Opt_nodirstat,
149 Opt_rbytes,
150 Opt_norbytes,
151 Opt_asyncreaddir,
152 Opt_noasyncreaddir,
153 Opt_dcache,
154 Opt_nodcache,
155 Opt_ino32,
156 Opt_noino32,
157 Opt_fscache,
158 Opt_nofscache,
159 Opt_poolperm,
160 Opt_nopoolperm,
161 Opt_require_active_mds,
162 Opt_norequire_active_mds,
163#ifdef CONFIG_CEPH_FS_POSIX_ACL
164 Opt_acl,
165#endif
166 Opt_noacl,
167 Opt_quotadf,
168 Opt_noquotadf,
169 Opt_copyfrom,
170 Opt_nocopyfrom,
171};
172
173static match_table_t fsopt_tokens = {
174 {Opt_wsize, "wsize=%d"},
175 {Opt_rsize, "rsize=%d"},
176 {Opt_rasize, "rasize=%d"},
177 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
178 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
179 {Opt_caps_max, "caps_max=%d"},
180 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
181 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
182 {Opt_congestion_kb, "write_congestion_kb=%d"},
183 /* int args above */
184 {Opt_snapdirname, "snapdirname=%s"},
185 {Opt_mds_namespace, "mds_namespace=%s"},
186 {Opt_fscache_uniq, "fsc=%s"},
187 /* string args above */
188 {Opt_dirstat, "dirstat"},
189 {Opt_nodirstat, "nodirstat"},
190 {Opt_rbytes, "rbytes"},
191 {Opt_norbytes, "norbytes"},
192 {Opt_asyncreaddir, "asyncreaddir"},
193 {Opt_noasyncreaddir, "noasyncreaddir"},
194 {Opt_dcache, "dcache"},
195 {Opt_nodcache, "nodcache"},
196 {Opt_ino32, "ino32"},
197 {Opt_noino32, "noino32"},
198 {Opt_fscache, "fsc"},
199 {Opt_nofscache, "nofsc"},
200 {Opt_poolperm, "poolperm"},
201 {Opt_nopoolperm, "nopoolperm"},
202 {Opt_require_active_mds, "require_active_mds"},
203 {Opt_norequire_active_mds, "norequire_active_mds"},
204#ifdef CONFIG_CEPH_FS_POSIX_ACL
205 {Opt_acl, "acl"},
206#endif
207 {Opt_noacl, "noacl"},
208 {Opt_quotadf, "quotadf"},
209 {Opt_noquotadf, "noquotadf"},
210 {Opt_copyfrom, "copyfrom"},
211 {Opt_nocopyfrom, "nocopyfrom"},
212 {-1, NULL}
213};
214
215static int parse_fsopt_token(char *c, void *private)
216{
217 struct ceph_mount_options *fsopt = private;
218 substring_t argstr[MAX_OPT_ARGS];
219 int token, intval, ret;
220
221 token = match_token((char *)c, fsopt_tokens, argstr);
222 if (token < 0)
223 return -EINVAL;
224
225 if (token < Opt_last_int) {
226 ret = match_int(&argstr[0], &intval);
227 if (ret < 0) {
228 pr_err("bad option arg (not int) at '%s'\n", c);
229 return ret;
230 }
231 dout("got int token %d val %d\n", token, intval);
232 } else if (token > Opt_last_int && token < Opt_last_string) {
233 dout("got string token %d val %s\n", token,
234 argstr[0].from);
235 } else {
236 dout("got token %d\n", token);
237 }
238
239 switch (token) {
240 case Opt_snapdirname:
241 kfree(fsopt->snapdir_name);
242 fsopt->snapdir_name = kstrndup(argstr[0].from,
243 argstr[0].to-argstr[0].from,
244 GFP_KERNEL);
245 if (!fsopt->snapdir_name)
246 return -ENOMEM;
247 break;
248 case Opt_mds_namespace:
249 kfree(fsopt->mds_namespace);
250 fsopt->mds_namespace = kstrndup(argstr[0].from,
251 argstr[0].to-argstr[0].from,
252 GFP_KERNEL);
253 if (!fsopt->mds_namespace)
254 return -ENOMEM;
255 break;
256 case Opt_fscache_uniq:
257 kfree(fsopt->fscache_uniq);
258 fsopt->fscache_uniq = kstrndup(argstr[0].from,
259 argstr[0].to-argstr[0].from,
260 GFP_KERNEL);
261 if (!fsopt->fscache_uniq)
262 return -ENOMEM;
263 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
264 break;
265 /* misc */
266 case Opt_wsize:
267 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
268 return -EINVAL;
269 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
270 break;
271 case Opt_rsize:
272 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
273 return -EINVAL;
274 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
275 break;
276 case Opt_rasize:
277 if (intval < 0)
278 return -EINVAL;
279 fsopt->rasize = ALIGN(intval, PAGE_SIZE);
280 break;
281 case Opt_caps_wanted_delay_min:
282 if (intval < 1)
283 return -EINVAL;
284 fsopt->caps_wanted_delay_min = intval;
285 break;
286 case Opt_caps_wanted_delay_max:
287 if (intval < 1)
288 return -EINVAL;
289 fsopt->caps_wanted_delay_max = intval;
290 break;
291 case Opt_caps_max:
292 if (intval < 0)
293 return -EINVAL;
294 fsopt->caps_max = intval;
295 break;
296 case Opt_readdir_max_entries:
297 if (intval < 1)
298 return -EINVAL;
299 fsopt->max_readdir = intval;
300 break;
301 case Opt_readdir_max_bytes:
302 if (intval < (int)PAGE_SIZE && intval != 0)
303 return -EINVAL;
304 fsopt->max_readdir_bytes = intval;
305 break;
306 case Opt_congestion_kb:
307 if (intval < 1024) /* at least 1M */
308 return -EINVAL;
309 fsopt->congestion_kb = intval;
310 break;
311 case Opt_dirstat:
312 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
313 break;
314 case Opt_nodirstat:
315 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
316 break;
317 case Opt_rbytes:
318 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
319 break;
320 case Opt_norbytes:
321 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
322 break;
323 case Opt_asyncreaddir:
324 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
325 break;
326 case Opt_noasyncreaddir:
327 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
328 break;
329 case Opt_dcache:
330 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
331 break;
332 case Opt_nodcache:
333 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
334 break;
335 case Opt_ino32:
336 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
337 break;
338 case Opt_noino32:
339 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
340 break;
341 case Opt_fscache:
342 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
343 kfree(fsopt->fscache_uniq);
344 fsopt->fscache_uniq = NULL;
345 break;
346 case Opt_nofscache:
347 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
348 kfree(fsopt->fscache_uniq);
349 fsopt->fscache_uniq = NULL;
350 break;
351 case Opt_poolperm:
352 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
353 break;
354 case Opt_nopoolperm:
355 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
356 break;
357 case Opt_require_active_mds:
358 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
359 break;
360 case Opt_norequire_active_mds:
361 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
362 break;
363 case Opt_quotadf:
364 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
365 break;
366 case Opt_noquotadf:
367 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
368 break;
369 case Opt_copyfrom:
370 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
371 break;
372 case Opt_nocopyfrom:
373 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
374 break;
375#ifdef CONFIG_CEPH_FS_POSIX_ACL
376 case Opt_acl:
377 fsopt->sb_flags |= SB_POSIXACL;
378 break;
379#endif
380 case Opt_noacl:
381 fsopt->sb_flags &= ~SB_POSIXACL;
382 break;
383 default:
384 BUG_ON(token);
385 }
386 return 0;
387}
388
389static void destroy_mount_options(struct ceph_mount_options *args)
390{
391 dout("destroy_mount_options %p\n", args);
392 kfree(args->snapdir_name);
393 kfree(args->mds_namespace);
394 kfree(args->server_path);
395 kfree(args->fscache_uniq);
396 kfree(args);
397}
398
399static int strcmp_null(const char *s1, const char *s2)
400{
401 if (!s1 && !s2)
402 return 0;
403 if (s1 && !s2)
404 return -1;
405 if (!s1 && s2)
406 return 1;
407 return strcmp(s1, s2);
408}
409
410static int compare_mount_options(struct ceph_mount_options *new_fsopt,
411 struct ceph_options *new_opt,
412 struct ceph_fs_client *fsc)
413{
414 struct ceph_mount_options *fsopt1 = new_fsopt;
415 struct ceph_mount_options *fsopt2 = fsc->mount_options;
416 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
417 int ret;
418
419 ret = memcmp(fsopt1, fsopt2, ofs);
420 if (ret)
421 return ret;
422
423 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
424 if (ret)
425 return ret;
426 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
427 if (ret)
428 return ret;
429 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
430 if (ret)
431 return ret;
432 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
433 if (ret)
434 return ret;
435
436 return ceph_compare_options(new_opt, fsc->client);
437}
438
439static int parse_mount_options(struct ceph_mount_options **pfsopt,
440 struct ceph_options **popt,
441 int flags, char *options,
442 const char *dev_name)
443{
444 struct ceph_mount_options *fsopt;
445 const char *dev_name_end;
446 int err;
447
448 if (!dev_name || !*dev_name)
449 return -EINVAL;
450
451 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
452 if (!fsopt)
453 return -ENOMEM;
454
455 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
456
457 fsopt->sb_flags = flags;
458 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
459
460 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
461 fsopt->rsize = CEPH_MAX_READ_SIZE;
462 fsopt->rasize = CEPH_RASIZE_DEFAULT;
463 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
464 if (!fsopt->snapdir_name) {
465 err = -ENOMEM;
466 goto out;
467 }
468
469 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
470 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
471 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
472 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
473 fsopt->congestion_kb = default_congestion_kb();
474
475 /*
476 * Distinguish the server list from the path in "dev_name".
477 * Internally we do not include the leading '/' in the path.
478 *
479 * "dev_name" will look like:
480 * <server_spec>[,<server_spec>...]:[<path>]
481 * where
482 * <server_spec> is <ip>[:<port>]
483 * <path> is optional, but if present must begin with '/'
484 */
485 dev_name_end = strchr(dev_name, '/');
486 if (dev_name_end) {
487 if (strlen(dev_name_end) > 1) {
488 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
489 if (!fsopt->server_path) {
490 err = -ENOMEM;
491 goto out;
492 }
493 }
494 } else {
495 dev_name_end = dev_name + strlen(dev_name);
496 }
497 err = -EINVAL;
498 dev_name_end--; /* back up to ':' separator */
499 if (dev_name_end < dev_name || *dev_name_end != ':') {
500 pr_err("device name is missing path (no : separator in %s)\n",
501 dev_name);
502 goto out;
503 }
504 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
505 if (fsopt->server_path)
506 dout("server path '%s'\n", fsopt->server_path);
507
508 *popt = ceph_parse_options(options, dev_name, dev_name_end,
509 parse_fsopt_token, (void *)fsopt);
510 if (IS_ERR(*popt)) {
511 err = PTR_ERR(*popt);
512 goto out;
513 }
514
515 /* success */
516 *pfsopt = fsopt;
517 return 0;
518
519out:
520 destroy_mount_options(fsopt);
521 return err;
522}
523
524/**
525 * ceph_show_options - Show mount options in /proc/mounts
526 * @m: seq_file to write to
527 * @root: root of that (sub)tree
528 */
529static int ceph_show_options(struct seq_file *m, struct dentry *root)
530{
531 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
532 struct ceph_mount_options *fsopt = fsc->mount_options;
533 size_t pos;
534 int ret;
535
536 /* a comma between MNT/MS and client options */
537 seq_putc(m, ',');
538 pos = m->count;
539
540 ret = ceph_print_client_options(m, fsc->client, false);
541 if (ret)
542 return ret;
543
544 /* retract our comma if no client options */
545 if (m->count == pos)
546 m->count--;
547
548 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
549 seq_puts(m, ",dirstat");
550 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
551 seq_puts(m, ",rbytes");
552 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
553 seq_puts(m, ",noasyncreaddir");
554 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
555 seq_puts(m, ",nodcache");
556 if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
557 seq_puts(m, ",ino32");
558 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
559 seq_show_option(m, "fsc", fsopt->fscache_uniq);
560 }
561 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
562 seq_puts(m, ",nopoolperm");
563 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
564 seq_puts(m, ",noquotadf");
565
566#ifdef CONFIG_CEPH_FS_POSIX_ACL
567 if (fsopt->sb_flags & SB_POSIXACL)
568 seq_puts(m, ",acl");
569 else
570 seq_puts(m, ",noacl");
571#endif
572
573 if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
574 seq_puts(m, ",copyfrom");
575
576 if (fsopt->mds_namespace)
577 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
578 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
579 seq_printf(m, ",wsize=%d", fsopt->wsize);
580 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
581 seq_printf(m, ",rsize=%d", fsopt->rsize);
582 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
583 seq_printf(m, ",rasize=%d", fsopt->rasize);
584 if (fsopt->congestion_kb != default_congestion_kb())
585 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
586 if (fsopt->caps_max)
587 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
588 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
589 seq_printf(m, ",caps_wanted_delay_min=%d",
590 fsopt->caps_wanted_delay_min);
591 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
592 seq_printf(m, ",caps_wanted_delay_max=%d",
593 fsopt->caps_wanted_delay_max);
594 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
595 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
596 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
597 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
598 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
599 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
600
601 return 0;
602}
603
604/*
605 * handle any mon messages the standard library doesn't understand.
606 * return error if we don't either.
607 */
608static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
609{
610 struct ceph_fs_client *fsc = client->private;
611 int type = le16_to_cpu(msg->hdr.type);
612
613 switch (type) {
614 case CEPH_MSG_MDS_MAP:
615 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
616 return 0;
617 case CEPH_MSG_FS_MAP_USER:
618 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
619 return 0;
620 default:
621 return -1;
622 }
623}
624
625/*
626 * create a new fs client
627 *
628 * Success or not, this function consumes @fsopt and @opt.
629 */
630static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
631 struct ceph_options *opt)
632{
633 struct ceph_fs_client *fsc;
634 int page_count;
635 size_t size;
636 int err;
637
638 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
639 if (!fsc) {
640 err = -ENOMEM;
641 goto fail;
642 }
643
644 fsc->client = ceph_create_client(opt, fsc);
645 if (IS_ERR(fsc->client)) {
646 err = PTR_ERR(fsc->client);
647 goto fail;
648 }
649 opt = NULL; /* fsc->client now owns this */
650
651 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
652 ceph_set_opt(fsc->client, ABORT_ON_FULL);
653
654 if (!fsopt->mds_namespace) {
655 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
656 0, true);
657 } else {
658 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
659 0, false);
660 }
661
662 fsc->mount_options = fsopt;
663
664 fsc->sb = NULL;
665 fsc->mount_state = CEPH_MOUNT_MOUNTING;
666
667 atomic_long_set(&fsc->writeback_count, 0);
668
669 err = -ENOMEM;
670 /*
671 * The number of concurrent works can be high but they don't need
672 * to be processed in parallel, limit concurrency.
673 */
674 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
675 if (!fsc->wb_wq)
676 goto fail_client;
677 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
678 if (!fsc->pg_inv_wq)
679 goto fail_wb_wq;
680 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
681 if (!fsc->trunc_wq)
682 goto fail_pg_inv_wq;
683 fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
684 if (!fsc->cap_wq)
685 goto fail_trunc_wq;
686
687 /* set up mempools */
688 err = -ENOMEM;
689 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
690 size = sizeof (struct page *) * (page_count ? page_count : 1);
691 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
692 if (!fsc->wb_pagevec_pool)
693 goto fail_cap_wq;
694
695 return fsc;
696
697fail_cap_wq:
698 destroy_workqueue(fsc->cap_wq);
699fail_trunc_wq:
700 destroy_workqueue(fsc->trunc_wq);
701fail_pg_inv_wq:
702 destroy_workqueue(fsc->pg_inv_wq);
703fail_wb_wq:
704 destroy_workqueue(fsc->wb_wq);
705fail_client:
706 ceph_destroy_client(fsc->client);
707fail:
708 kfree(fsc);
709 if (opt)
710 ceph_destroy_options(opt);
711 destroy_mount_options(fsopt);
712 return ERR_PTR(err);
713}
714
715static void flush_fs_workqueues(struct ceph_fs_client *fsc)
716{
717 flush_workqueue(fsc->wb_wq);
718 flush_workqueue(fsc->pg_inv_wq);
719 flush_workqueue(fsc->trunc_wq);
720 flush_workqueue(fsc->cap_wq);
721}
722
723static void destroy_fs_client(struct ceph_fs_client *fsc)
724{
725 dout("destroy_fs_client %p\n", fsc);
726
727 destroy_workqueue(fsc->wb_wq);
728 destroy_workqueue(fsc->pg_inv_wq);
729 destroy_workqueue(fsc->trunc_wq);
730 destroy_workqueue(fsc->cap_wq);
731
732 mempool_destroy(fsc->wb_pagevec_pool);
733
734 destroy_mount_options(fsc->mount_options);
735
736 ceph_destroy_client(fsc->client);
737
738 kfree(fsc);
739 dout("destroy_fs_client %p done\n", fsc);
740}
741
742/*
743 * caches
744 */
745struct kmem_cache *ceph_inode_cachep;
746struct kmem_cache *ceph_cap_cachep;
747struct kmem_cache *ceph_cap_flush_cachep;
748struct kmem_cache *ceph_dentry_cachep;
749struct kmem_cache *ceph_file_cachep;
750struct kmem_cache *ceph_dir_file_cachep;
751
752static void ceph_inode_init_once(void *foo)
753{
754 struct ceph_inode_info *ci = foo;
755 inode_init_once(&ci->vfs_inode);
756}
757
758static int __init init_caches(void)
759{
760 int error = -ENOMEM;
761
762 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
763 sizeof(struct ceph_inode_info),
764 __alignof__(struct ceph_inode_info),
765 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
766 SLAB_ACCOUNT, ceph_inode_init_once);
767 if (!ceph_inode_cachep)
768 return -ENOMEM;
769
770 ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
771 if (!ceph_cap_cachep)
772 goto bad_cap;
773 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
774 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
775 if (!ceph_cap_flush_cachep)
776 goto bad_cap_flush;
777
778 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
779 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
780 if (!ceph_dentry_cachep)
781 goto bad_dentry;
782
783 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
784 if (!ceph_file_cachep)
785 goto bad_file;
786
787 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
788 if (!ceph_dir_file_cachep)
789 goto bad_dir_file;
790
791 error = ceph_fscache_register();
792 if (error)
793 goto bad_fscache;
794
795 return 0;
796
797bad_fscache:
798 kmem_cache_destroy(ceph_dir_file_cachep);
799bad_dir_file:
800 kmem_cache_destroy(ceph_file_cachep);
801bad_file:
802 kmem_cache_destroy(ceph_dentry_cachep);
803bad_dentry:
804 kmem_cache_destroy(ceph_cap_flush_cachep);
805bad_cap_flush:
806 kmem_cache_destroy(ceph_cap_cachep);
807bad_cap:
808 kmem_cache_destroy(ceph_inode_cachep);
809 return error;
810}
811
812static void destroy_caches(void)
813{
814 /*
815 * Make sure all delayed rcu free inodes are flushed before we
816 * destroy cache.
817 */
818 rcu_barrier();
819
820 kmem_cache_destroy(ceph_inode_cachep);
821 kmem_cache_destroy(ceph_cap_cachep);
822 kmem_cache_destroy(ceph_cap_flush_cachep);
823 kmem_cache_destroy(ceph_dentry_cachep);
824 kmem_cache_destroy(ceph_file_cachep);
825 kmem_cache_destroy(ceph_dir_file_cachep);
826
827 ceph_fscache_unregister();
828}
829
830
831/*
832 * ceph_umount_begin - initiate forced umount. Tear down down the
833 * mount, skipping steps that may hang while waiting for server(s).
834 */
835static void ceph_umount_begin(struct super_block *sb)
836{
837 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
838
839 dout("ceph_umount_begin - starting forced umount\n");
840 if (!fsc)
841 return;
842 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
843 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
844 ceph_mdsc_force_umount(fsc->mdsc);
845 return;
846}
847
848static const struct super_operations ceph_super_ops = {
849 .alloc_inode = ceph_alloc_inode,
850 .destroy_inode = ceph_destroy_inode,
851 .write_inode = ceph_write_inode,
852 .drop_inode = ceph_drop_inode,
853 .sync_fs = ceph_sync_fs,
854 .put_super = ceph_put_super,
855 .show_options = ceph_show_options,
856 .statfs = ceph_statfs,
857 .umount_begin = ceph_umount_begin,
858};
859
860/*
861 * Bootstrap mount by opening the root directory. Note the mount
862 * @started time from caller, and time out if this takes too long.
863 */
864static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
865 const char *path,
866 unsigned long started)
867{
868 struct ceph_mds_client *mdsc = fsc->mdsc;
869 struct ceph_mds_request *req = NULL;
870 int err;
871 struct dentry *root;
872
873 /* open dir */
874 dout("open_root_inode opening '%s'\n", path);
875 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
876 if (IS_ERR(req))
877 return ERR_CAST(req);
878 req->r_path1 = kstrdup(path, GFP_NOFS);
879 if (!req->r_path1) {
880 root = ERR_PTR(-ENOMEM);
881 goto out;
882 }
883
884 req->r_ino1.ino = CEPH_INO_ROOT;
885 req->r_ino1.snap = CEPH_NOSNAP;
886 req->r_started = started;
887 req->r_timeout = fsc->client->options->mount_timeout;
888 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
889 req->r_num_caps = 2;
890 err = ceph_mdsc_do_request(mdsc, NULL, req);
891 if (err == 0) {
892 struct inode *inode = req->r_target_inode;
893 req->r_target_inode = NULL;
894 dout("open_root_inode success\n");
895 root = d_make_root(inode);
896 if (!root) {
897 root = ERR_PTR(-ENOMEM);
898 goto out;
899 }
900 dout("open_root_inode success, root dentry is %p\n", root);
901 } else {
902 root = ERR_PTR(err);
903 }
904out:
905 ceph_mdsc_put_request(req);
906 return root;
907}
908
909
910
911
912/*
913 * mount: join the ceph cluster, and open root directory.
914 */
915static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
916{
917 int err;
918 unsigned long started = jiffies; /* note the start time */
919 struct dentry *root;
920
921 dout("mount start %p\n", fsc);
922 mutex_lock(&fsc->client->mount_mutex);
923
924 if (!fsc->sb->s_root) {
925 const char *path;
926 err = __ceph_open_session(fsc->client, started);
927 if (err < 0)
928 goto out;
929
930 /* setup fscache */
931 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
932 err = ceph_fscache_register_fs(fsc);
933 if (err < 0)
934 goto out;
935 }
936
937 if (!fsc->mount_options->server_path) {
938 path = "";
939 dout("mount opening path \\t\n");
940 } else {
941 path = fsc->mount_options->server_path + 1;
942 dout("mount opening path %s\n", path);
943 }
944
945 err = ceph_fs_debugfs_init(fsc);
946 if (err < 0)
947 goto out;
948
949 root = open_root_dentry(fsc, path, started);
950 if (IS_ERR(root)) {
951 err = PTR_ERR(root);
952 goto out;
953 }
954 fsc->sb->s_root = dget(root);
955 } else {
956 root = dget(fsc->sb->s_root);
957 }
958
959 fsc->mount_state = CEPH_MOUNT_MOUNTED;
960 dout("mount success\n");
961 mutex_unlock(&fsc->client->mount_mutex);
962 return root;
963
964out:
965 mutex_unlock(&fsc->client->mount_mutex);
966 return ERR_PTR(err);
967}
968
969static int ceph_set_super(struct super_block *s, void *data)
970{
971 struct ceph_fs_client *fsc = data;
972 int ret;
973
974 dout("set_super %p data %p\n", s, data);
975
976 s->s_flags = fsc->mount_options->sb_flags;
977 s->s_maxbytes = MAX_LFS_FILESIZE;
978
979 s->s_xattr = ceph_xattr_handlers;
980 s->s_fs_info = fsc;
981 fsc->sb = s;
982 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
983
984 s->s_op = &ceph_super_ops;
985 s->s_d_op = &ceph_dentry_ops;
986 s->s_export_op = &ceph_export_ops;
987
988 s->s_time_gran = 1000; /* 1000 ns == 1 us */
989
990 ret = set_anon_super(s, NULL); /* what is that second arg for? */
991 if (ret != 0)
992 goto fail;
993
994 return ret;
995
996fail:
997 s->s_fs_info = NULL;
998 fsc->sb = NULL;
999 return ret;
1000}
1001
1002/*
1003 * share superblock if same fs AND options
1004 */
1005static int ceph_compare_super(struct super_block *sb, void *data)
1006{
1007 struct ceph_fs_client *new = data;
1008 struct ceph_mount_options *fsopt = new->mount_options;
1009 struct ceph_options *opt = new->client->options;
1010 struct ceph_fs_client *other = ceph_sb_to_client(sb);
1011
1012 dout("ceph_compare_super %p\n", sb);
1013
1014 if (compare_mount_options(fsopt, opt, other)) {
1015 dout("monitor(s)/mount options don't match\n");
1016 return 0;
1017 }
1018 if ((opt->flags & CEPH_OPT_FSID) &&
1019 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1020 dout("fsid doesn't match\n");
1021 return 0;
1022 }
1023 if (fsopt->sb_flags != other->mount_options->sb_flags) {
1024 dout("flags differ\n");
1025 return 0;
1026 }
1027 return 1;
1028}
1029
1030/*
1031 * construct our own bdi so we can control readahead, etc.
1032 */
1033static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1034
1035static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1036{
1037 int err;
1038
1039 err = super_setup_bdi_name(sb, "ceph-%ld",
1040 atomic_long_inc_return(&bdi_seq));
1041 if (err)
1042 return err;
1043
1044 /* set ra_pages based on rasize mount option? */
1045 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1046
1047 /* set io_pages based on max osd read size */
1048 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1049
1050 return 0;
1051}
1052
1053static struct dentry *ceph_mount(struct file_system_type *fs_type,
1054 int flags, const char *dev_name, void *data)
1055{
1056 struct super_block *sb;
1057 struct ceph_fs_client *fsc;
1058 struct dentry *res;
1059 int err;
1060 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1061 struct ceph_mount_options *fsopt = NULL;
1062 struct ceph_options *opt = NULL;
1063
1064 dout("ceph_mount\n");
1065
1066#ifdef CONFIG_CEPH_FS_POSIX_ACL
1067 flags |= SB_POSIXACL;
1068#endif
1069 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1070 if (err < 0) {
1071 res = ERR_PTR(err);
1072 goto out_final;
1073 }
1074
1075 /* create client (which we may/may not use) */
1076 fsc = create_fs_client(fsopt, opt);
1077 if (IS_ERR(fsc)) {
1078 res = ERR_CAST(fsc);
1079 goto out_final;
1080 }
1081
1082 err = ceph_mdsc_init(fsc);
1083 if (err < 0) {
1084 res = ERR_PTR(err);
1085 goto out;
1086 }
1087
1088 if (ceph_test_opt(fsc->client, NOSHARE))
1089 compare_super = NULL;
1090 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1091 if (IS_ERR(sb)) {
1092 res = ERR_CAST(sb);
1093 goto out;
1094 }
1095
1096 if (ceph_sb_to_client(sb) != fsc) {
1097 ceph_mdsc_destroy(fsc);
1098 destroy_fs_client(fsc);
1099 fsc = ceph_sb_to_client(sb);
1100 dout("get_sb got existing client %p\n", fsc);
1101 } else {
1102 dout("get_sb using new client %p\n", fsc);
1103 err = ceph_setup_bdi(sb, fsc);
1104 if (err < 0) {
1105 res = ERR_PTR(err);
1106 goto out_splat;
1107 }
1108 }
1109
1110 res = ceph_real_mount(fsc);
1111 if (IS_ERR(res))
1112 goto out_splat;
1113 dout("root %p inode %p ino %llx.%llx\n", res,
1114 d_inode(res), ceph_vinop(d_inode(res)));
1115 return res;
1116
1117out_splat:
1118 ceph_mdsc_close_sessions(fsc->mdsc);
1119 deactivate_locked_super(sb);
1120 goto out_final;
1121
1122out:
1123 ceph_mdsc_destroy(fsc);
1124 destroy_fs_client(fsc);
1125out_final:
1126 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1127 return res;
1128}
1129
1130static void ceph_kill_sb(struct super_block *s)
1131{
1132 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1133 dev_t dev = s->s_dev;
1134
1135 dout("kill_sb %p\n", s);
1136
1137 ceph_mdsc_pre_umount(fsc->mdsc);
1138 flush_fs_workqueues(fsc);
1139
1140 generic_shutdown_super(s);
1141
1142 fsc->client->extra_mon_dispatch = NULL;
1143 ceph_fs_debugfs_cleanup(fsc);
1144
1145 ceph_fscache_unregister_fs(fsc);
1146
1147 ceph_mdsc_destroy(fsc);
1148
1149 destroy_fs_client(fsc);
1150 free_anon_bdev(dev);
1151}
1152
1153static struct file_system_type ceph_fs_type = {
1154 .owner = THIS_MODULE,
1155 .name = "ceph",
1156 .mount = ceph_mount,
1157 .kill_sb = ceph_kill_sb,
1158 .fs_flags = FS_RENAME_DOES_D_MOVE,
1159};
1160MODULE_ALIAS_FS("ceph");
1161
1162static int __init init_ceph(void)
1163{
1164 int ret = init_caches();
1165 if (ret)
1166 goto out;
1167
1168 ceph_flock_init();
1169 ceph_xattr_init();
1170 ret = register_filesystem(&ceph_fs_type);
1171 if (ret)
1172 goto out_xattr;
1173
1174 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1175
1176 return 0;
1177
1178out_xattr:
1179 ceph_xattr_exit();
1180 destroy_caches();
1181out:
1182 return ret;
1183}
1184
1185static void __exit exit_ceph(void)
1186{
1187 dout("exit_ceph\n");
1188 unregister_filesystem(&ceph_fs_type);
1189 ceph_xattr_exit();
1190 destroy_caches();
1191}
1192
1193module_init(init_ceph);
1194module_exit(exit_ceph);
1195
1196MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1197MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1198MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1199MODULE_DESCRIPTION("Ceph filesystem for Linux");
1200MODULE_LICENSE("GPL");