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drm/panfrost: Remove set but not used variable 'bo'
[linux/fpc-iii.git] / fs / ceph / super.c
blob1d9f083b8a1153f361a6abff6dd8370aad23b587
1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/ceph/ceph_debug.h>
4
5 #include <linux/backing-dev.h>
6 #include <linux/ctype.h>
7 #include <linux/fs.h>
8 #include <linux/inet.h>
9 #include <linux/in6.h>
10 #include <linux/module.h>
11 #include <linux/mount.h>
12 #include <linux/fs_context.h>
13 #include <linux/fs_parser.h>
14 #include <linux/sched.h>
15 #include <linux/seq_file.h>
16 #include <linux/slab.h>
17 #include <linux/statfs.h>
18 #include <linux/string.h>
19
20 #include "super.h"
21 #include "mds_client.h"
22 #include "cache.h"
23
24 #include <linux/ceph/ceph_features.h>
25 #include <linux/ceph/decode.h>
26 #include <linux/ceph/mon_client.h>
27 #include <linux/ceph/auth.h>
28 #include <linux/ceph/debugfs.h>
29
30 /*
31 * Ceph superblock operations
32 *
33 * Handle the basics of mounting, unmounting.
34 */
35
36 /*
37 * super ops
38 */
39 static void ceph_put_super(struct super_block *s)
40 {
41 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
42
43 dout("put_super\n");
44 ceph_mdsc_close_sessions(fsc->mdsc);
45 }
46
47 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
48 {
49 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
50 struct ceph_mon_client *monc = &fsc->client->monc;
51 struct ceph_statfs st;
52 u64 fsid;
53 int err;
54 u64 data_pool;
55
56 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
57 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
58 } else {
59 data_pool = CEPH_NOPOOL;
60 }
61
62 dout("statfs\n");
63 err = ceph_monc_do_statfs(monc, data_pool, &st);
64 if (err < 0)
65 return err;
66
67 /* fill in kstatfs */
68 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
69
70 /*
71 * express utilization in terms of large blocks to avoid
72 * overflow on 32-bit machines.
73 *
74 * NOTE: for the time being, we make bsize == frsize to humor
75 * not-yet-ancient versions of glibc that are broken.
76 * Someday, we will probably want to report a real block
77 * size... whatever that may mean for a network file system!
78 */
79 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
80 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
81
82 /*
83 * By default use root quota for stats; fallback to overall filesystem
84 * usage if using 'noquotadf' mount option or if the root dir doesn't
85 * have max_bytes quota set.
86 */
87 if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
88 !ceph_quota_update_statfs(fsc, buf)) {
89 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
90 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
91 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
92 }
93
94 buf->f_files = le64_to_cpu(st.num_objects);
95 buf->f_ffree = -1;
96 buf->f_namelen = NAME_MAX;
97
98 /* Must convert the fsid, for consistent values across arches */
99 mutex_lock(&monc->mutex);
100 fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
101 le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
102 mutex_unlock(&monc->mutex);
103
104 buf->f_fsid.val[0] = fsid & 0xffffffff;
105 buf->f_fsid.val[1] = fsid >> 32;
106
107 return 0;
108 }
109
110 static int ceph_sync_fs(struct super_block *sb, int wait)
111 {
112 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
113
114 if (!wait) {
115 dout("sync_fs (non-blocking)\n");
116 ceph_flush_dirty_caps(fsc->mdsc);
117 dout("sync_fs (non-blocking) done\n");
118 return 0;
119 }
120
121 dout("sync_fs (blocking)\n");
122 ceph_osdc_sync(&fsc->client->osdc);
123 ceph_mdsc_sync(fsc->mdsc);
124 dout("sync_fs (blocking) done\n");
125 return 0;
126 }
127
128 /*
129 * mount options
130 */
131 enum {
132 Opt_wsize,
133 Opt_rsize,
134 Opt_rasize,
135 Opt_caps_wanted_delay_min,
136 Opt_caps_wanted_delay_max,
137 Opt_caps_max,
138 Opt_readdir_max_entries,
139 Opt_readdir_max_bytes,
140 Opt_congestion_kb,
141 /* int args above */
142 Opt_snapdirname,
143 Opt_mds_namespace,
144 Opt_recover_session,
145 Opt_source,
146 /* string args above */
147 Opt_dirstat,
148 Opt_rbytes,
149 Opt_asyncreaddir,
150 Opt_dcache,
151 Opt_ino32,
152 Opt_fscache,
153 Opt_poolperm,
154 Opt_require_active_mds,
155 Opt_acl,
156 Opt_quotadf,
157 Opt_copyfrom,
158 };
159
160 enum ceph_recover_session_mode {
161 ceph_recover_session_no,
162 ceph_recover_session_clean
163 };
164
165 static const struct constant_table ceph_param_recover[] = {
166 { "no", ceph_recover_session_no },
167 { "clean", ceph_recover_session_clean },
168 {}
169 };
170
171 static const struct fs_parameter_spec ceph_mount_parameters[] = {
172 fsparam_flag_no ("acl", Opt_acl),
173 fsparam_flag_no ("asyncreaddir", Opt_asyncreaddir),
174 fsparam_s32 ("caps_max", Opt_caps_max),
175 fsparam_u32 ("caps_wanted_delay_max", Opt_caps_wanted_delay_max),
176 fsparam_u32 ("caps_wanted_delay_min", Opt_caps_wanted_delay_min),
177 fsparam_u32 ("write_congestion_kb", Opt_congestion_kb),
178 fsparam_flag_no ("copyfrom", Opt_copyfrom),
179 fsparam_flag_no ("dcache", Opt_dcache),
180 fsparam_flag_no ("dirstat", Opt_dirstat),
181 fsparam_flag_no ("fsc", Opt_fscache), // fsc|nofsc
182 fsparam_string ("fsc", Opt_fscache), // fsc=...
183 fsparam_flag_no ("ino32", Opt_ino32),
184 fsparam_string ("mds_namespace", Opt_mds_namespace),
185 fsparam_flag_no ("poolperm", Opt_poolperm),
186 fsparam_flag_no ("quotadf", Opt_quotadf),
187 fsparam_u32 ("rasize", Opt_rasize),
188 fsparam_flag_no ("rbytes", Opt_rbytes),
189 fsparam_u32 ("readdir_max_bytes", Opt_readdir_max_bytes),
190 fsparam_u32 ("readdir_max_entries", Opt_readdir_max_entries),
191 fsparam_enum ("recover_session", Opt_recover_session, ceph_param_recover),
192 fsparam_flag_no ("require_active_mds", Opt_require_active_mds),
193 fsparam_u32 ("rsize", Opt_rsize),
194 fsparam_string ("snapdirname", Opt_snapdirname),
195 fsparam_string ("source", Opt_source),
196 fsparam_u32 ("wsize", Opt_wsize),
197 {}
198 };
199
200 struct ceph_parse_opts_ctx {
201 struct ceph_options *copts;
202 struct ceph_mount_options *opts;
203 };
204
205 /*
206 * Parse the source parameter. Distinguish the server list from the path.
207 *
208 * The source will look like:
209 * <server_spec>[,<server_spec>...]:[<path>]
210 * where
211 * <server_spec> is <ip>[:<port>]
212 * <path> is optional, but if present must begin with '/'
213 */
214 static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
215 {
216 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
217 struct ceph_mount_options *fsopt = pctx->opts;
218 char *dev_name = param->string, *dev_name_end;
219 int ret;
220
221 dout("%s '%s'\n", __func__, dev_name);
222 if (!dev_name || !*dev_name)
223 return invalfc(fc, "Empty source");
224
225 dev_name_end = strchr(dev_name, '/');
226 if (dev_name_end) {
227 kfree(fsopt->server_path);
228
229 /*
230 * The server_path will include the whole chars from userland
231 * including the leading '/'.
232 */
233 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
234 if (!fsopt->server_path)
235 return -ENOMEM;
236 } else {
237 dev_name_end = dev_name + strlen(dev_name);
238 }
239
240 dev_name_end--; /* back up to ':' separator */
241 if (dev_name_end < dev_name || *dev_name_end != ':')
242 return invalfc(fc, "No path or : separator in source");
243
244 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
245 if (fsopt->server_path)
246 dout("server path '%s'\n", fsopt->server_path);
247
248 ret = ceph_parse_mon_ips(param->string, dev_name_end - dev_name,
249 pctx->copts, fc->log.log);
250 if (ret)
251 return ret;
252
253 fc->source = param->string;
254 param->string = NULL;
255 return 0;
256 }
257
258 static int ceph_parse_mount_param(struct fs_context *fc,
259 struct fs_parameter *param)
260 {
261 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
262 struct ceph_mount_options *fsopt = pctx->opts;
263 struct fs_parse_result result;
264 unsigned int mode;
265 int token, ret;
266
267 ret = ceph_parse_param(param, pctx->copts, fc->log.log);
268 if (ret != -ENOPARAM)
269 return ret;
270
271 token = fs_parse(fc, ceph_mount_parameters, param, &result);
272 dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
273 if (token < 0)
274 return token;
275
276 switch (token) {
277 case Opt_snapdirname:
278 kfree(fsopt->snapdir_name);
279 fsopt->snapdir_name = param->string;
280 param->string = NULL;
281 break;
282 case Opt_mds_namespace:
283 kfree(fsopt->mds_namespace);
284 fsopt->mds_namespace = param->string;
285 param->string = NULL;
286 break;
287 case Opt_recover_session:
288 mode = result.uint_32;
289 if (mode == ceph_recover_session_no)
290 fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
291 else if (mode == ceph_recover_session_clean)
292 fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
293 else
294 BUG();
295 break;
296 case Opt_source:
297 if (fc->source)
298 return invalfc(fc, "Multiple sources specified");
299 return ceph_parse_source(param, fc);
300 case Opt_wsize:
301 if (result.uint_32 < PAGE_SIZE ||
302 result.uint_32 > CEPH_MAX_WRITE_SIZE)
303 goto out_of_range;
304 fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
305 break;
306 case Opt_rsize:
307 if (result.uint_32 < PAGE_SIZE ||
308 result.uint_32 > CEPH_MAX_READ_SIZE)
309 goto out_of_range;
310 fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
311 break;
312 case Opt_rasize:
313 fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
314 break;
315 case Opt_caps_wanted_delay_min:
316 if (result.uint_32 < 1)
317 goto out_of_range;
318 fsopt->caps_wanted_delay_min = result.uint_32;
319 break;
320 case Opt_caps_wanted_delay_max:
321 if (result.uint_32 < 1)
322 goto out_of_range;
323 fsopt->caps_wanted_delay_max = result.uint_32;
324 break;
325 case Opt_caps_max:
326 if (result.int_32 < 0)
327 goto out_of_range;
328 fsopt->caps_max = result.int_32;
329 break;
330 case Opt_readdir_max_entries:
331 if (result.uint_32 < 1)
332 goto out_of_range;
333 fsopt->max_readdir = result.uint_32;
334 break;
335 case Opt_readdir_max_bytes:
336 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
337 goto out_of_range;
338 fsopt->max_readdir_bytes = result.uint_32;
339 break;
340 case Opt_congestion_kb:
341 if (result.uint_32 < 1024) /* at least 1M */
342 goto out_of_range;
343 fsopt->congestion_kb = result.uint_32;
344 break;
345 case Opt_dirstat:
346 if (!result.negated)
347 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
348 else
349 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
350 break;
351 case Opt_rbytes:
352 if (!result.negated)
353 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
354 else
355 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
356 break;
357 case Opt_asyncreaddir:
358 if (!result.negated)
359 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
360 else
361 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
362 break;
363 case Opt_dcache:
364 if (!result.negated)
365 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
366 else
367 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
368 break;
369 case Opt_ino32:
370 if (!result.negated)
371 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
372 else
373 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
374 break;
375
376 case Opt_fscache:
377 #ifdef CONFIG_CEPH_FSCACHE
378 kfree(fsopt->fscache_uniq);
379 fsopt->fscache_uniq = NULL;
380 if (result.negated) {
381 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
382 } else {
383 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
384 fsopt->fscache_uniq = param->string;
385 param->string = NULL;
386 }
387 break;
388 #else
389 return invalfc(fc, "fscache support is disabled");
390 #endif
391 case Opt_poolperm:
392 if (!result.negated)
393 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
394 else
395 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
396 break;
397 case Opt_require_active_mds:
398 if (!result.negated)
399 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
400 else
401 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
402 break;
403 case Opt_quotadf:
404 if (!result.negated)
405 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
406 else
407 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
408 break;
409 case Opt_copyfrom:
410 if (!result.negated)
411 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
412 else
413 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
414 break;
415 case Opt_acl:
416 if (!result.negated) {
417 #ifdef CONFIG_CEPH_FS_POSIX_ACL
418 fc->sb_flags |= SB_POSIXACL;
419 #else
420 return invalfc(fc, "POSIX ACL support is disabled");
421 #endif
422 } else {
423 fc->sb_flags &= ~SB_POSIXACL;
424 }
425 break;
426 default:
427 BUG();
428 }
429 return 0;
430
431 out_of_range:
432 return invalfc(fc, "%s out of range", param->key);
433 }
434
435 static void destroy_mount_options(struct ceph_mount_options *args)
436 {
437 dout("destroy_mount_options %p\n", args);
438 if (!args)
439 return;
440
441 kfree(args->snapdir_name);
442 kfree(args->mds_namespace);
443 kfree(args->server_path);
444 kfree(args->fscache_uniq);
445 kfree(args);
446 }
447
448 static int strcmp_null(const char *s1, const char *s2)
449 {
450 if (!s1 && !s2)
451 return 0;
452 if (s1 && !s2)
453 return -1;
454 if (!s1 && s2)
455 return 1;
456 return strcmp(s1, s2);
457 }
458
459 /**
460 * path_remove_extra_slash - Remove the extra slashes in the server path
461 * @server_path: the server path and could be NULL
462 *
463 * Return NULL if the path is NULL or only consists of "/", or a string
464 * without any extra slashes including the leading slash(es) and the
465 * slash(es) at the end of the server path, such as:
466 * "//dir1////dir2///" --> "dir1/dir2"
467 */
468 static char *path_remove_extra_slash(const char *server_path)
469 {
470 const char *path = server_path;
471 const char *cur, *end;
472 char *buf, *p;
473 int len;
474
475 /* if the server path is omitted */
476 if (!path)
477 return NULL;
478
479 /* remove all the leading slashes */
480 while (*path == '/')
481 path++;
482
483 /* if the server path only consists of slashes */
484 if (*path == '\0')
485 return NULL;
486
487 len = strlen(path);
488
489 buf = kmalloc(len + 1, GFP_KERNEL);
490 if (!buf)
491 return ERR_PTR(-ENOMEM);
492
493 end = path + len;
494 p = buf;
495 do {
496 cur = strchr(path, '/');
497 if (!cur)
498 cur = end;
499
500 len = cur - path;
501
502 /* including one '/' */
503 if (cur != end)
504 len += 1;
505
506 memcpy(p, path, len);
507 p += len;
508
509 while (cur <= end && *cur == '/')
510 cur++;
511 path = cur;
512 } while (path < end);
513
514 *p = '\0';
515
516 /*
517 * remove the last slash if there has and just to make sure that
518 * we will get something like "dir1/dir2"
519 */
520 if (*(--p) == '/')
521 *p = '\0';
522
523 return buf;
524 }
525
526 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
527 struct ceph_options *new_opt,
528 struct ceph_fs_client *fsc)
529 {
530 struct ceph_mount_options *fsopt1 = new_fsopt;
531 struct ceph_mount_options *fsopt2 = fsc->mount_options;
532 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
533 char *p1, *p2;
534 int ret;
535
536 ret = memcmp(fsopt1, fsopt2, ofs);
537 if (ret)
538 return ret;
539
540 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
541 if (ret)
542 return ret;
543 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
544 if (ret)
545 return ret;
546
547 p1 = path_remove_extra_slash(fsopt1->server_path);
548 if (IS_ERR(p1))
549 return PTR_ERR(p1);
550 p2 = path_remove_extra_slash(fsopt2->server_path);
551 if (IS_ERR(p2)) {
552 kfree(p1);
553 return PTR_ERR(p2);
554 }
555 ret = strcmp_null(p1, p2);
556 kfree(p1);
557 kfree(p2);
558 if (ret)
559 return ret;
560
561 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
562 if (ret)
563 return ret;
564
565 return ceph_compare_options(new_opt, fsc->client);
566 }
567
568 /**
569 * ceph_show_options - Show mount options in /proc/mounts
570 * @m: seq_file to write to
571 * @root: root of that (sub)tree
572 */
573 static int ceph_show_options(struct seq_file *m, struct dentry *root)
574 {
575 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
576 struct ceph_mount_options *fsopt = fsc->mount_options;
577 size_t pos;
578 int ret;
579
580 /* a comma between MNT/MS and client options */
581 seq_putc(m, ',');
582 pos = m->count;
583
584 ret = ceph_print_client_options(m, fsc->client, false);
585 if (ret)
586 return ret;
587
588 /* retract our comma if no client options */
589 if (m->count == pos)
590 m->count--;
591
592 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
593 seq_puts(m, ",dirstat");
594 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
595 seq_puts(m, ",rbytes");
596 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
597 seq_puts(m, ",noasyncreaddir");
598 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
599 seq_puts(m, ",nodcache");
600 if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
601 seq_puts(m, ",ino32");
602 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
603 seq_show_option(m, "fsc", fsopt->fscache_uniq);
604 }
605 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
606 seq_puts(m, ",nopoolperm");
607 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
608 seq_puts(m, ",noquotadf");
609
610 #ifdef CONFIG_CEPH_FS_POSIX_ACL
611 if (root->d_sb->s_flags & SB_POSIXACL)
612 seq_puts(m, ",acl");
613 else
614 seq_puts(m, ",noacl");
615 #endif
616
617 if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
618 seq_puts(m, ",copyfrom");
619
620 if (fsopt->mds_namespace)
621 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
622
623 if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
624 seq_show_option(m, "recover_session", "clean");
625
626 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
627 seq_printf(m, ",wsize=%u", fsopt->wsize);
628 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
629 seq_printf(m, ",rsize=%u", fsopt->rsize);
630 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
631 seq_printf(m, ",rasize=%u", fsopt->rasize);
632 if (fsopt->congestion_kb != default_congestion_kb())
633 seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
634 if (fsopt->caps_max)
635 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
636 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
637 seq_printf(m, ",caps_wanted_delay_min=%u",
638 fsopt->caps_wanted_delay_min);
639 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
640 seq_printf(m, ",caps_wanted_delay_max=%u",
641 fsopt->caps_wanted_delay_max);
642 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
643 seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
644 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
645 seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
646 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
647 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
648
649 return 0;
650 }
651
652 /*
653 * handle any mon messages the standard library doesn't understand.
654 * return error if we don't either.
655 */
656 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
657 {
658 struct ceph_fs_client *fsc = client->private;
659 int type = le16_to_cpu(msg->hdr.type);
660
661 switch (type) {
662 case CEPH_MSG_MDS_MAP:
663 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
664 return 0;
665 case CEPH_MSG_FS_MAP_USER:
666 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
667 return 0;
668 default:
669 return -1;
670 }
671 }
672
673 /*
674 * create a new fs client
675 *
676 * Success or not, this function consumes @fsopt and @opt.
677 */
678 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
679 struct ceph_options *opt)
680 {
681 struct ceph_fs_client *fsc;
682 int page_count;
683 size_t size;
684 int err;
685
686 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
687 if (!fsc) {
688 err = -ENOMEM;
689 goto fail;
690 }
691
692 fsc->client = ceph_create_client(opt, fsc);
693 if (IS_ERR(fsc->client)) {
694 err = PTR_ERR(fsc->client);
695 goto fail;
696 }
697 opt = NULL; /* fsc->client now owns this */
698
699 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
700 ceph_set_opt(fsc->client, ABORT_ON_FULL);
701
702 if (!fsopt->mds_namespace) {
703 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
704 0, true);
705 } else {
706 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
707 0, false);
708 }
709
710 fsc->mount_options = fsopt;
711
712 fsc->sb = NULL;
713 fsc->mount_state = CEPH_MOUNT_MOUNTING;
714 fsc->filp_gen = 1;
715 fsc->have_copy_from2 = true;
716
717 atomic_long_set(&fsc->writeback_count, 0);
718
719 err = -ENOMEM;
720 /*
721 * The number of concurrent works can be high but they don't need
722 * to be processed in parallel, limit concurrency.
723 */
724 fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
725 if (!fsc->inode_wq)
726 goto fail_client;
727 fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
728 if (!fsc->cap_wq)
729 goto fail_inode_wq;
730
731 /* set up mempools */
732 err = -ENOMEM;
733 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
734 size = sizeof (struct page *) * (page_count ? page_count : 1);
735 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
736 if (!fsc->wb_pagevec_pool)
737 goto fail_cap_wq;
738
739 return fsc;
740
741 fail_cap_wq:
742 destroy_workqueue(fsc->cap_wq);
743 fail_inode_wq:
744 destroy_workqueue(fsc->inode_wq);
745 fail_client:
746 ceph_destroy_client(fsc->client);
747 fail:
748 kfree(fsc);
749 if (opt)
750 ceph_destroy_options(opt);
751 destroy_mount_options(fsopt);
752 return ERR_PTR(err);
753 }
754
755 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
756 {
757 flush_workqueue(fsc->inode_wq);
758 flush_workqueue(fsc->cap_wq);
759 }
760
761 static void destroy_fs_client(struct ceph_fs_client *fsc)
762 {
763 dout("destroy_fs_client %p\n", fsc);
764
765 ceph_mdsc_destroy(fsc);
766 destroy_workqueue(fsc->inode_wq);
767 destroy_workqueue(fsc->cap_wq);
768
769 mempool_destroy(fsc->wb_pagevec_pool);
770
771 destroy_mount_options(fsc->mount_options);
772
773 ceph_destroy_client(fsc->client);
774
775 kfree(fsc);
776 dout("destroy_fs_client %p done\n", fsc);
777 }
778
779 /*
780 * caches
781 */
782 struct kmem_cache *ceph_inode_cachep;
783 struct kmem_cache *ceph_cap_cachep;
784 struct kmem_cache *ceph_cap_flush_cachep;
785 struct kmem_cache *ceph_dentry_cachep;
786 struct kmem_cache *ceph_file_cachep;
787 struct kmem_cache *ceph_dir_file_cachep;
788
789 static void ceph_inode_init_once(void *foo)
790 {
791 struct ceph_inode_info *ci = foo;
792 inode_init_once(&ci->vfs_inode);
793 }
794
795 static int __init init_caches(void)
796 {
797 int error = -ENOMEM;
798
799 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
800 sizeof(struct ceph_inode_info),
801 __alignof__(struct ceph_inode_info),
802 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
803 SLAB_ACCOUNT, ceph_inode_init_once);
804 if (!ceph_inode_cachep)
805 return -ENOMEM;
806
807 ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
808 if (!ceph_cap_cachep)
809 goto bad_cap;
810 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
811 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
812 if (!ceph_cap_flush_cachep)
813 goto bad_cap_flush;
814
815 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
816 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
817 if (!ceph_dentry_cachep)
818 goto bad_dentry;
819
820 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
821 if (!ceph_file_cachep)
822 goto bad_file;
823
824 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
825 if (!ceph_dir_file_cachep)
826 goto bad_dir_file;
827
828 error = ceph_fscache_register();
829 if (error)
830 goto bad_fscache;
831
832 return 0;
833
834 bad_fscache:
835 kmem_cache_destroy(ceph_dir_file_cachep);
836 bad_dir_file:
837 kmem_cache_destroy(ceph_file_cachep);
838 bad_file:
839 kmem_cache_destroy(ceph_dentry_cachep);
840 bad_dentry:
841 kmem_cache_destroy(ceph_cap_flush_cachep);
842 bad_cap_flush:
843 kmem_cache_destroy(ceph_cap_cachep);
844 bad_cap:
845 kmem_cache_destroy(ceph_inode_cachep);
846 return error;
847 }
848
849 static void destroy_caches(void)
850 {
851 /*
852 * Make sure all delayed rcu free inodes are flushed before we
853 * destroy cache.
854 */
855 rcu_barrier();
856
857 kmem_cache_destroy(ceph_inode_cachep);
858 kmem_cache_destroy(ceph_cap_cachep);
859 kmem_cache_destroy(ceph_cap_flush_cachep);
860 kmem_cache_destroy(ceph_dentry_cachep);
861 kmem_cache_destroy(ceph_file_cachep);
862 kmem_cache_destroy(ceph_dir_file_cachep);
863
864 ceph_fscache_unregister();
865 }
866
867 /*
868 * ceph_umount_begin - initiate forced umount. Tear down down the
869 * mount, skipping steps that may hang while waiting for server(s).
870 */
871 static void ceph_umount_begin(struct super_block *sb)
872 {
873 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
874
875 dout("ceph_umount_begin - starting forced umount\n");
876 if (!fsc)
877 return;
878 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
879 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
880 ceph_mdsc_force_umount(fsc->mdsc);
881 fsc->filp_gen++; // invalidate open files
882 }
883
884 static const struct super_operations ceph_super_ops = {
885 .alloc_inode = ceph_alloc_inode,
886 .free_inode = ceph_free_inode,
887 .write_inode = ceph_write_inode,
888 .drop_inode = generic_delete_inode,
889 .evict_inode = ceph_evict_inode,
890 .sync_fs = ceph_sync_fs,
891 .put_super = ceph_put_super,
892 .show_options = ceph_show_options,
893 .statfs = ceph_statfs,
894 .umount_begin = ceph_umount_begin,
895 };
896
897 /*
898 * Bootstrap mount by opening the root directory. Note the mount
899 * @started time from caller, and time out if this takes too long.
900 */
901 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
902 const char *path,
903 unsigned long started)
904 {
905 struct ceph_mds_client *mdsc = fsc->mdsc;
906 struct ceph_mds_request *req = NULL;
907 int err;
908 struct dentry *root;
909
910 /* open dir */
911 dout("open_root_inode opening '%s'\n", path);
912 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
913 if (IS_ERR(req))
914 return ERR_CAST(req);
915 req->r_path1 = kstrdup(path, GFP_NOFS);
916 if (!req->r_path1) {
917 root = ERR_PTR(-ENOMEM);
918 goto out;
919 }
920
921 req->r_ino1.ino = CEPH_INO_ROOT;
922 req->r_ino1.snap = CEPH_NOSNAP;
923 req->r_started = started;
924 req->r_timeout = fsc->client->options->mount_timeout;
925 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
926 req->r_num_caps = 2;
927 err = ceph_mdsc_do_request(mdsc, NULL, req);
928 if (err == 0) {
929 struct inode *inode = req->r_target_inode;
930 req->r_target_inode = NULL;
931 dout("open_root_inode success\n");
932 root = d_make_root(inode);
933 if (!root) {
934 root = ERR_PTR(-ENOMEM);
935 goto out;
936 }
937 dout("open_root_inode success, root dentry is %p\n", root);
938 } else {
939 root = ERR_PTR(err);
940 }
941 out:
942 ceph_mdsc_put_request(req);
943 return root;
944 }
945
946 /*
947 * mount: join the ceph cluster, and open root directory.
948 */
949 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
950 struct fs_context *fc)
951 {
952 int err;
953 unsigned long started = jiffies; /* note the start time */
954 struct dentry *root;
955
956 dout("mount start %p\n", fsc);
957 mutex_lock(&fsc->client->mount_mutex);
958
959 if (!fsc->sb->s_root) {
960 const char *path, *p;
961 err = __ceph_open_session(fsc->client, started);
962 if (err < 0)
963 goto out;
964
965 /* setup fscache */
966 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
967 err = ceph_fscache_register_fs(fsc, fc);
968 if (err < 0)
969 goto out;
970 }
971
972 p = path_remove_extra_slash(fsc->mount_options->server_path);
973 if (IS_ERR(p)) {
974 err = PTR_ERR(p);
975 goto out;
976 }
977 /* if the server path is omitted or just consists of '/' */
978 if (!p)
979 path = "";
980 else
981 path = p;
982 dout("mount opening path '%s'\n", path);
983
984 ceph_fs_debugfs_init(fsc);
985
986 root = open_root_dentry(fsc, path, started);
987 kfree(p);
988 if (IS_ERR(root)) {
989 err = PTR_ERR(root);
990 goto out;
991 }
992 fsc->sb->s_root = dget(root);
993 } else {
994 root = dget(fsc->sb->s_root);
995 }
996
997 fsc->mount_state = CEPH_MOUNT_MOUNTED;
998 dout("mount success\n");
999 mutex_unlock(&fsc->client->mount_mutex);
1000 return root;
1001
1002 out:
1003 mutex_unlock(&fsc->client->mount_mutex);
1004 return ERR_PTR(err);
1005 }
1006
1007 static int ceph_set_super(struct super_block *s, struct fs_context *fc)
1008 {
1009 struct ceph_fs_client *fsc = s->s_fs_info;
1010 int ret;
1011
1012 dout("set_super %p\n", s);
1013
1014 s->s_maxbytes = MAX_LFS_FILESIZE;
1015
1016 s->s_xattr = ceph_xattr_handlers;
1017 fsc->sb = s;
1018 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
1019
1020 s->s_op = &ceph_super_ops;
1021 s->s_d_op = &ceph_dentry_ops;
1022 s->s_export_op = &ceph_export_ops;
1023
1024 s->s_time_gran = 1;
1025 s->s_time_min = 0;
1026 s->s_time_max = U32_MAX;
1027
1028 ret = set_anon_super_fc(s, fc);
1029 if (ret != 0)
1030 fsc->sb = NULL;
1031 return ret;
1032 }
1033
1034 /*
1035 * share superblock if same fs AND options
1036 */
1037 static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
1038 {
1039 struct ceph_fs_client *new = fc->s_fs_info;
1040 struct ceph_mount_options *fsopt = new->mount_options;
1041 struct ceph_options *opt = new->client->options;
1042 struct ceph_fs_client *other = ceph_sb_to_client(sb);
1043
1044 dout("ceph_compare_super %p\n", sb);
1045
1046 if (compare_mount_options(fsopt, opt, other)) {
1047 dout("monitor(s)/mount options don't match\n");
1048 return 0;
1049 }
1050 if ((opt->flags & CEPH_OPT_FSID) &&
1051 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1052 dout("fsid doesn't match\n");
1053 return 0;
1054 }
1055 if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
1056 dout("flags differ\n");
1057 return 0;
1058 }
1059 return 1;
1060 }
1061
1062 /*
1063 * construct our own bdi so we can control readahead, etc.
1064 */
1065 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1066
1067 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1068 {
1069 int err;
1070
1071 err = super_setup_bdi_name(sb, "ceph-%ld",
1072 atomic_long_inc_return(&bdi_seq));
1073 if (err)
1074 return err;
1075
1076 /* set ra_pages based on rasize mount option? */
1077 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1078
1079 /* set io_pages based on max osd read size */
1080 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1081
1082 return 0;
1083 }
1084
1085 static int ceph_get_tree(struct fs_context *fc)
1086 {
1087 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1088 struct super_block *sb;
1089 struct ceph_fs_client *fsc;
1090 struct dentry *res;
1091 int (*compare_super)(struct super_block *, struct fs_context *) =
1092 ceph_compare_super;
1093 int err;
1094
1095 dout("ceph_get_tree\n");
1096
1097 if (!fc->source)
1098 return invalfc(fc, "No source");
1099
1100 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1101 fc->sb_flags |= SB_POSIXACL;
1102 #endif
1103
1104 /* create client (which we may/may not use) */
1105 fsc = create_fs_client(pctx->opts, pctx->copts);
1106 pctx->opts = NULL;
1107 pctx->copts = NULL;
1108 if (IS_ERR(fsc)) {
1109 err = PTR_ERR(fsc);
1110 goto out_final;
1111 }
1112
1113 err = ceph_mdsc_init(fsc);
1114 if (err < 0)
1115 goto out;
1116
1117 if (ceph_test_opt(fsc->client, NOSHARE))
1118 compare_super = NULL;
1119
1120 fc->s_fs_info = fsc;
1121 sb = sget_fc(fc, compare_super, ceph_set_super);
1122 fc->s_fs_info = NULL;
1123 if (IS_ERR(sb)) {
1124 err = PTR_ERR(sb);
1125 goto out;
1126 }
1127
1128 if (ceph_sb_to_client(sb) != fsc) {
1129 destroy_fs_client(fsc);
1130 fsc = ceph_sb_to_client(sb);
1131 dout("get_sb got existing client %p\n", fsc);
1132 } else {
1133 dout("get_sb using new client %p\n", fsc);
1134 err = ceph_setup_bdi(sb, fsc);
1135 if (err < 0)
1136 goto out_splat;
1137 }
1138
1139 res = ceph_real_mount(fsc, fc);
1140 if (IS_ERR(res)) {
1141 err = PTR_ERR(res);
1142 goto out_splat;
1143 }
1144 dout("root %p inode %p ino %llx.%llx\n", res,
1145 d_inode(res), ceph_vinop(d_inode(res)));
1146 fc->root = fsc->sb->s_root;
1147 return 0;
1148
1149 out_splat:
1150 if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
1151 pr_info("No mds server is up or the cluster is laggy\n");
1152 err = -EHOSTUNREACH;
1153 }
1154
1155 ceph_mdsc_close_sessions(fsc->mdsc);
1156 deactivate_locked_super(sb);
1157 goto out_final;
1158
1159 out:
1160 destroy_fs_client(fsc);
1161 out_final:
1162 dout("ceph_get_tree fail %d\n", err);
1163 return err;
1164 }
1165
1166 static void ceph_free_fc(struct fs_context *fc)
1167 {
1168 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1169
1170 if (pctx) {
1171 destroy_mount_options(pctx->opts);
1172 ceph_destroy_options(pctx->copts);
1173 kfree(pctx);
1174 }
1175 }
1176
1177 static int ceph_reconfigure_fc(struct fs_context *fc)
1178 {
1179 sync_filesystem(fc->root->d_sb);
1180 return 0;
1181 }
1182
1183 static const struct fs_context_operations ceph_context_ops = {
1184 .free = ceph_free_fc,
1185 .parse_param = ceph_parse_mount_param,
1186 .get_tree = ceph_get_tree,
1187 .reconfigure = ceph_reconfigure_fc,
1188 };
1189
1190 /*
1191 * Set up the filesystem mount context.
1192 */
1193 static int ceph_init_fs_context(struct fs_context *fc)
1194 {
1195 struct ceph_parse_opts_ctx *pctx;
1196 struct ceph_mount_options *fsopt;
1197
1198 pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1199 if (!pctx)
1200 return -ENOMEM;
1201
1202 pctx->copts = ceph_alloc_options();
1203 if (!pctx->copts)
1204 goto nomem;
1205
1206 pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1207 if (!pctx->opts)
1208 goto nomem;
1209
1210 fsopt = pctx->opts;
1211 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1212
1213 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1214 fsopt->rsize = CEPH_MAX_READ_SIZE;
1215 fsopt->rasize = CEPH_RASIZE_DEFAULT;
1216 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1217 if (!fsopt->snapdir_name)
1218 goto nomem;
1219
1220 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1221 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1222 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1223 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1224 fsopt->congestion_kb = default_congestion_kb();
1225
1226 fc->fs_private = pctx;
1227 fc->ops = &ceph_context_ops;
1228 return 0;
1229
1230 nomem:
1231 destroy_mount_options(pctx->opts);
1232 ceph_destroy_options(pctx->copts);
1233 kfree(pctx);
1234 return -ENOMEM;
1235 }
1236
1237 static void ceph_kill_sb(struct super_block *s)
1238 {
1239 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1240 dev_t dev = s->s_dev;
1241
1242 dout("kill_sb %p\n", s);
1243
1244 ceph_mdsc_pre_umount(fsc->mdsc);
1245 flush_fs_workqueues(fsc);
1246
1247 generic_shutdown_super(s);
1248
1249 fsc->client->extra_mon_dispatch = NULL;
1250 ceph_fs_debugfs_cleanup(fsc);
1251
1252 ceph_fscache_unregister_fs(fsc);
1253
1254 destroy_fs_client(fsc);
1255 free_anon_bdev(dev);
1256 }
1257
1258 static struct file_system_type ceph_fs_type = {
1259 .owner = THIS_MODULE,
1260 .name = "ceph",
1261 .init_fs_context = ceph_init_fs_context,
1262 .kill_sb = ceph_kill_sb,
1263 .fs_flags = FS_RENAME_DOES_D_MOVE,
1264 };
1265 MODULE_ALIAS_FS("ceph");
1266
1267 int ceph_force_reconnect(struct super_block *sb)
1268 {
1269 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1270 int err = 0;
1271
1272 ceph_umount_begin(sb);
1273
1274 /* Make sure all page caches get invalidated.
1275 * see remove_session_caps_cb() */
1276 flush_workqueue(fsc->inode_wq);
1277
1278 /* In case that we were blacklisted. This also reset
1279 * all mon/osd connections */
1280 ceph_reset_client_addr(fsc->client);
1281
1282 ceph_osdc_clear_abort_err(&fsc->client->osdc);
1283
1284 fsc->blacklisted = false;
1285 fsc->mount_state = CEPH_MOUNT_MOUNTED;
1286
1287 if (sb->s_root) {
1288 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1289 CEPH_STAT_CAP_INODE, true);
1290 }
1291 return err;
1292 }
1293
1294 static int __init init_ceph(void)
1295 {
1296 int ret = init_caches();
1297 if (ret)
1298 goto out;
1299
1300 ceph_flock_init();
1301 ret = register_filesystem(&ceph_fs_type);
1302 if (ret)
1303 goto out_caches;
1304
1305 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1306
1307 return 0;
1308
1309 out_caches:
1310 destroy_caches();
1311 out:
1312 return ret;
1313 }
1314
1315 static void __exit exit_ceph(void)
1316 {
1317 dout("exit_ceph\n");
1318 unregister_filesystem(&ceph_fs_type);
1319 destroy_caches();
1320 }
1321
1322 module_init(init_ceph);
1323 module_exit(exit_ceph);
1324
1325 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1326 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1327 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1328 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1329 MODULE_LICENSE("GPL");
Linux with added FPC-III support