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 #include "crypto.h"
24 #include "subvolume_metrics.h"
25
26 #include <linux/ceph/ceph_features.h>
27 #include <linux/ceph/decode.h>
28 #include <linux/ceph/mon_client.h>
29 #include <linux/ceph/auth.h>
30 #include <linux/ceph/debugfs.h>
31
32 #include <uapi/linux/magic.h>
33
34 #define CREATE_TRACE_POINTS
35 #include <trace/events/ceph.h>
36
37 static DEFINE_SPINLOCK(ceph_fsc_lock);
38 static LIST_HEAD(ceph_fsc_list);
39
40 /*
41 * Ceph superblock operations
42 *
43 * Handle the basics of mounting, unmounting.
44 */
45
46 /*
47 * super ops
48 */
ceph_put_super(struct super_block * s)49 static void ceph_put_super(struct super_block *s)
50 {
51 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(s);
52
53 doutc(fsc->client, "begin\n");
54 ceph_fscrypt_free_dummy_policy(fsc);
55 ceph_mdsc_close_sessions(fsc->mdsc);
56 doutc(fsc->client, "done\n");
57 }
58
ceph_statfs(struct dentry * dentry,struct kstatfs * buf)59 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
60 {
61 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(d_inode(dentry));
62 struct ceph_mon_client *monc = &fsc->client->monc;
63 struct ceph_statfs st;
64 int i, err;
65 u64 data_pool;
66
67 doutc(fsc->client, "begin\n");
68 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
69 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
70 } else {
71 data_pool = CEPH_NOPOOL;
72 }
73
74 err = ceph_monc_do_statfs(monc, data_pool, &st);
75 if (err < 0)
76 return err;
77
78 /* fill in kstatfs */
79 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
80
81 /*
82 * Express utilization in terms of large blocks to avoid
83 * overflow on 32-bit machines.
84 */
85 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
86
87 /*
88 * By default use root quota for stats; fallback to overall filesystem
89 * usage if using 'noquotadf' mount option or if the root dir doesn't
90 * have max_bytes quota set.
91 */
92 if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
93 !ceph_quota_update_statfs(fsc, buf)) {
94 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
95 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
96 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
97 }
98
99 /*
100 * NOTE: for the time being, we make bsize == frsize to humor
101 * not-yet-ancient versions of glibc that are broken.
102 * Someday, we will probably want to report a real block
103 * size... whatever that may mean for a network file system!
104 */
105 buf->f_bsize = buf->f_frsize;
106
107 buf->f_files = le64_to_cpu(st.num_objects);
108 buf->f_ffree = -1;
109 buf->f_namelen = NAME_MAX;
110
111 /* Must convert the fsid, for consistent values across arches */
112 buf->f_fsid.val[0] = 0;
113 mutex_lock(&monc->mutex);
114 for (i = 0 ; i < sizeof(monc->monmap->fsid) / sizeof(__le32) ; ++i)
115 buf->f_fsid.val[0] ^= le32_to_cpu(((__le32 *)&monc->monmap->fsid)[i]);
116 mutex_unlock(&monc->mutex);
117
118 /* fold the fs_cluster_id into the upper bits */
119 buf->f_fsid.val[1] = monc->fs_cluster_id;
120
121 doutc(fsc->client, "done\n");
122 return 0;
123 }
124
ceph_sync_fs(struct super_block * sb,int wait)125 static int ceph_sync_fs(struct super_block *sb, int wait)
126 {
127 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
128 struct ceph_client *cl = fsc->client;
129
130 if (!wait) {
131 doutc(cl, "(non-blocking)\n");
132 ceph_flush_dirty_caps(fsc->mdsc);
133 ceph_flush_cap_releases(fsc->mdsc);
134 doutc(cl, "(non-blocking) done\n");
135 return 0;
136 }
137
138 doutc(cl, "(blocking)\n");
139 ceph_osdc_sync(&fsc->client->osdc);
140 ceph_mdsc_sync(fsc->mdsc);
141 doutc(cl, "(blocking) done\n");
142 return 0;
143 }
144
145 /*
146 * mount options
147 */
148 enum {
149 Opt_wsize,
150 Opt_rsize,
151 Opt_rasize,
152 Opt_caps_wanted_delay_min,
153 Opt_caps_wanted_delay_max,
154 Opt_caps_max,
155 Opt_readdir_max_entries,
156 Opt_readdir_max_bytes,
157 Opt_congestion_kb,
158 /* int args above */
159 Opt_snapdirname,
160 Opt_mds_namespace,
161 Opt_recover_session,
162 Opt_source,
163 Opt_mon_addr,
164 Opt_test_dummy_encryption,
165 /* string args above */
166 Opt_dirstat,
167 Opt_rbytes,
168 Opt_asyncreaddir,
169 Opt_dcache,
170 Opt_ino32,
171 Opt_fscache,
172 Opt_poolperm,
173 Opt_require_active_mds,
174 Opt_acl,
175 Opt_quotadf,
176 Opt_copyfrom,
177 Opt_wsync,
178 Opt_pagecache,
179 Opt_sparseread,
180 };
181
182 enum ceph_recover_session_mode {
183 ceph_recover_session_no,
184 ceph_recover_session_clean
185 };
186
187 static const struct constant_table ceph_param_recover[] = {
188 { "no", ceph_recover_session_no },
189 { "clean", ceph_recover_session_clean },
190 {}
191 };
192
193 static const struct fs_parameter_spec ceph_mount_parameters[] = {
194 fsparam_flag_no ("acl", Opt_acl),
195 fsparam_flag_no ("asyncreaddir", Opt_asyncreaddir),
196 fsparam_s32 ("caps_max", Opt_caps_max),
197 fsparam_u32 ("caps_wanted_delay_max", Opt_caps_wanted_delay_max),
198 fsparam_u32 ("caps_wanted_delay_min", Opt_caps_wanted_delay_min),
199 fsparam_u32 ("write_congestion_kb", Opt_congestion_kb),
200 fsparam_flag_no ("copyfrom", Opt_copyfrom),
201 fsparam_flag_no ("dcache", Opt_dcache),
202 fsparam_flag_no ("dirstat", Opt_dirstat),
203 fsparam_flag_no ("fsc", Opt_fscache), // fsc|nofsc
204 fsparam_string ("fsc", Opt_fscache), // fsc=...
205 fsparam_flag_no ("ino32", Opt_ino32),
206 fsparam_string ("mds_namespace", Opt_mds_namespace),
207 fsparam_string ("mon_addr", Opt_mon_addr),
208 fsparam_flag_no ("poolperm", Opt_poolperm),
209 fsparam_flag_no ("quotadf", Opt_quotadf),
210 fsparam_u32 ("rasize", Opt_rasize),
211 fsparam_flag_no ("rbytes", Opt_rbytes),
212 fsparam_u32 ("readdir_max_bytes", Opt_readdir_max_bytes),
213 fsparam_u32 ("readdir_max_entries", Opt_readdir_max_entries),
214 fsparam_enum ("recover_session", Opt_recover_session, ceph_param_recover),
215 fsparam_flag_no ("require_active_mds", Opt_require_active_mds),
216 fsparam_u32 ("rsize", Opt_rsize),
217 fsparam_string ("snapdirname", Opt_snapdirname),
218 fsparam_string ("source", Opt_source),
219 fsparam_flag ("test_dummy_encryption", Opt_test_dummy_encryption),
220 fsparam_string ("test_dummy_encryption", Opt_test_dummy_encryption),
221 fsparam_u32 ("wsize", Opt_wsize),
222 fsparam_flag_no ("wsync", Opt_wsync),
223 fsparam_flag_no ("pagecache", Opt_pagecache),
224 fsparam_flag_no ("sparseread", Opt_sparseread),
225 {}
226 };
227
228 struct ceph_parse_opts_ctx {
229 struct ceph_options *copts;
230 struct ceph_mount_options *opts;
231 };
232
233 /*
234 * Remove adjacent slashes and then the trailing slash, unless it is
235 * the only remaining character.
236 *
237 * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
238 */
canonicalize_path(char * path)239 static void canonicalize_path(char *path)
240 {
241 int i, j = 0;
242
243 for (i = 0; path[i] != '\0'; i++) {
244 if (path[i] != '/' || j < 1 || path[j - 1] != '/')
245 path[j++] = path[i];
246 }
247
248 if (j > 1 && path[j - 1] == '/')
249 j--;
250 path[j] = '\0';
251 }
252
ceph_parse_old_source(const char * dev_name,const char * dev_name_end,struct fs_context * fc)253 static int ceph_parse_old_source(const char *dev_name, const char *dev_name_end,
254 struct fs_context *fc)
255 {
256 int r;
257 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
258 struct ceph_mount_options *fsopt = pctx->opts;
259
260 if (*dev_name_end != ':')
261 return invalfc(fc, "separator ':' missing in source");
262
263 r = ceph_parse_mon_ips(dev_name, dev_name_end - dev_name,
264 pctx->copts, fc->log.log, ',');
265 if (r)
266 return r;
267
268 fsopt->new_dev_syntax = false;
269 return 0;
270 }
271
ceph_parse_new_source(const char * dev_name,const char * dev_name_end,struct fs_context * fc)272 static int ceph_parse_new_source(const char *dev_name, const char *dev_name_end,
273 struct fs_context *fc)
274 {
275 size_t len;
276 struct ceph_fsid fsid;
277 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
278 struct ceph_options *opts = pctx->copts;
279 struct ceph_mount_options *fsopt = pctx->opts;
280 const char *name_start = dev_name;
281 const char *fsid_start, *fs_name_start;
282
283 if (*dev_name_end != '=') {
284 dout("separator '=' missing in source");
285 return -EINVAL;
286 }
287
288 fsid_start = strchr(dev_name, '@');
289 if (!fsid_start)
290 return invalfc(fc, "missing cluster fsid");
291 len = fsid_start - name_start;
292 kfree(opts->name);
293 opts->name = kstrndup(name_start, len, GFP_KERNEL);
294 if (!opts->name)
295 return -ENOMEM;
296 dout("using %s entity name", opts->name);
297
298 ++fsid_start; /* start of cluster fsid */
299 fs_name_start = strchr(fsid_start, '.');
300 if (!fs_name_start)
301 return invalfc(fc, "missing file system name");
302
303 if (ceph_parse_fsid(fsid_start, &fsid))
304 return invalfc(fc, "Invalid FSID");
305
306 ++fs_name_start; /* start of file system name */
307 len = dev_name_end - fs_name_start;
308
309 if (!namespace_equals(fsopt, fs_name_start, len))
310 return invalfc(fc, "Mismatching mds_namespace");
311 kfree(fsopt->mds_namespace);
312 fsopt->mds_namespace = kstrndup(fs_name_start, len, GFP_KERNEL);
313 if (!fsopt->mds_namespace)
314 return -ENOMEM;
315 dout("file system (mds namespace) '%s'\n", fsopt->mds_namespace);
316
317 fsopt->new_dev_syntax = true;
318 return 0;
319 }
320
321 /*
322 * Parse the source parameter for new device format. Distinguish the device
323 * spec from the path. Try parsing new device format and fallback to old
324 * format if needed.
325 *
326 * New device syntax will looks like:
327 * <device_spec>=/<path>
328 * where
329 * <device_spec> is name@fsid.fsname
330 * <path> is optional, but if present must begin with '/'
331 * (monitor addresses are passed via mount option)
332 *
333 * Old device syntax is:
334 * <server_spec>[,<server_spec>...]:[<path>]
335 * where
336 * <server_spec> is <ip>[:<port>]
337 * <path> is optional, but if present must begin with '/'
338 */
ceph_parse_source(struct fs_parameter * param,struct fs_context * fc)339 static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
340 {
341 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
342 struct ceph_mount_options *fsopt = pctx->opts;
343 char *dev_name = param->string, *dev_name_end;
344 int ret;
345
346 dout("'%s'\n", dev_name);
347 if (!dev_name || !*dev_name)
348 return invalfc(fc, "Empty source");
349
350 dev_name_end = strchr(dev_name, '/');
351 if (dev_name_end) {
352 /*
353 * The server_path will include the whole chars from userland
354 * including the leading '/'.
355 */
356 kfree(fsopt->server_path);
357 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
358 if (!fsopt->server_path)
359 return -ENOMEM;
360
361 canonicalize_path(fsopt->server_path);
362 } else {
363 dev_name_end = dev_name + strlen(dev_name);
364 }
365
366 dev_name_end--; /* back up to separator */
367 if (dev_name_end < dev_name)
368 return invalfc(fc, "Path missing in source");
369
370 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
371 if (fsopt->server_path)
372 dout("server path '%s'\n", fsopt->server_path);
373
374 dout("trying new device syntax");
375 ret = ceph_parse_new_source(dev_name, dev_name_end, fc);
376 if (ret) {
377 if (ret != -EINVAL)
378 return ret;
379 dout("trying old device syntax");
380 ret = ceph_parse_old_source(dev_name, dev_name_end, fc);
381 if (ret)
382 return ret;
383 }
384
385 fc->source = param->string;
386 param->string = NULL;
387 return 0;
388 }
389
ceph_parse_mon_addr(struct fs_parameter * param,struct fs_context * fc)390 static int ceph_parse_mon_addr(struct fs_parameter *param,
391 struct fs_context *fc)
392 {
393 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
394 struct ceph_mount_options *fsopt = pctx->opts;
395
396 kfree(fsopt->mon_addr);
397 fsopt->mon_addr = param->string;
398 param->string = NULL;
399
400 return ceph_parse_mon_ips(fsopt->mon_addr, strlen(fsopt->mon_addr),
401 pctx->copts, fc->log.log, '/');
402 }
403
ceph_parse_mount_param(struct fs_context * fc,struct fs_parameter * param)404 static int ceph_parse_mount_param(struct fs_context *fc,
405 struct fs_parameter *param)
406 {
407 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
408 struct ceph_mount_options *fsopt = pctx->opts;
409 struct fs_parse_result result;
410 unsigned int mode;
411 int token, ret;
412
413 ret = ceph_parse_param(param, pctx->copts, fc->log.log);
414 if (ret != -ENOPARAM)
415 return ret;
416
417 token = fs_parse(fc, ceph_mount_parameters, param, &result);
418 dout("%s: fs_parse '%s' token %d\n",__func__, param->key, token);
419 if (token < 0)
420 return token;
421
422 switch (token) {
423 case Opt_snapdirname:
424 if (strlen(param->string) > NAME_MAX)
425 return invalfc(fc, "snapdirname too long");
426 kfree(fsopt->snapdir_name);
427 fsopt->snapdir_name = param->string;
428 param->string = NULL;
429 break;
430 case Opt_mds_namespace:
431 if (!namespace_equals(fsopt, param->string, strlen(param->string)))
432 return invalfc(fc, "Mismatching mds_namespace");
433 kfree(fsopt->mds_namespace);
434 fsopt->mds_namespace = param->string;
435 param->string = NULL;
436 break;
437 case Opt_recover_session:
438 mode = result.uint_32;
439 if (mode == ceph_recover_session_no)
440 fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
441 else if (mode == ceph_recover_session_clean)
442 fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
443 else
444 BUG();
445 break;
446 case Opt_source:
447 if (fc->source)
448 return invalfc(fc, "Multiple sources specified");
449 return ceph_parse_source(param, fc);
450 case Opt_mon_addr:
451 return ceph_parse_mon_addr(param, fc);
452 case Opt_wsize:
453 if (result.uint_32 < PAGE_SIZE ||
454 result.uint_32 > CEPH_MAX_WRITE_SIZE)
455 goto out_of_range;
456 fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
457 break;
458 case Opt_rsize:
459 if (result.uint_32 < PAGE_SIZE ||
460 result.uint_32 > CEPH_MAX_READ_SIZE)
461 goto out_of_range;
462 fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
463 break;
464 case Opt_rasize:
465 fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
466 break;
467 case Opt_caps_wanted_delay_min:
468 if (result.uint_32 < 1)
469 goto out_of_range;
470 fsopt->caps_wanted_delay_min = result.uint_32;
471 break;
472 case Opt_caps_wanted_delay_max:
473 if (result.uint_32 < 1)
474 goto out_of_range;
475 fsopt->caps_wanted_delay_max = result.uint_32;
476 break;
477 case Opt_caps_max:
478 if (result.int_32 < 0)
479 goto out_of_range;
480 fsopt->caps_max = result.int_32;
481 break;
482 case Opt_readdir_max_entries:
483 if (result.uint_32 < 1)
484 goto out_of_range;
485 fsopt->max_readdir = result.uint_32;
486 break;
487 case Opt_readdir_max_bytes:
488 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
489 goto out_of_range;
490 fsopt->max_readdir_bytes = result.uint_32;
491 break;
492 case Opt_congestion_kb:
493 if (result.uint_32 < 1024) /* at least 1M */
494 goto out_of_range;
495 fsopt->congestion_kb = result.uint_32;
496 break;
497 case Opt_dirstat:
498 if (!result.negated)
499 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
500 else
501 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
502 break;
503 case Opt_rbytes:
504 if (!result.negated)
505 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
506 else
507 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
508 break;
509 case Opt_asyncreaddir:
510 if (!result.negated)
511 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
512 else
513 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
514 break;
515 case Opt_dcache:
516 if (!result.negated)
517 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
518 else
519 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
520 break;
521 case Opt_ino32:
522 if (!result.negated)
523 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
524 else
525 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
526 break;
527
528 case Opt_fscache:
529 #ifdef CONFIG_CEPH_FSCACHE
530 kfree(fsopt->fscache_uniq);
531 fsopt->fscache_uniq = NULL;
532 if (result.negated) {
533 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
534 } else {
535 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
536 fsopt->fscache_uniq = param->string;
537 param->string = NULL;
538 }
539 break;
540 #else
541 return invalfc(fc, "fscache support is disabled");
542 #endif
543 case Opt_poolperm:
544 if (!result.negated)
545 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
546 else
547 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
548 break;
549 case Opt_require_active_mds:
550 if (!result.negated)
551 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
552 else
553 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
554 break;
555 case Opt_quotadf:
556 if (!result.negated)
557 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
558 else
559 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
560 break;
561 case Opt_copyfrom:
562 if (!result.negated)
563 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
564 else
565 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
566 break;
567 case Opt_acl:
568 if (!result.negated) {
569 #ifdef CONFIG_CEPH_FS_POSIX_ACL
570 fc->sb_flags |= SB_POSIXACL;
571 #else
572 return invalfc(fc, "POSIX ACL support is disabled");
573 #endif
574 } else {
575 fc->sb_flags &= ~SB_POSIXACL;
576 }
577 break;
578 case Opt_wsync:
579 if (!result.negated)
580 fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
581 else
582 fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
583 break;
584 case Opt_pagecache:
585 if (result.negated)
586 fsopt->flags |= CEPH_MOUNT_OPT_NOPAGECACHE;
587 else
588 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPAGECACHE;
589 break;
590 case Opt_sparseread:
591 if (result.negated)
592 fsopt->flags &= ~CEPH_MOUNT_OPT_SPARSEREAD;
593 else
594 fsopt->flags |= CEPH_MOUNT_OPT_SPARSEREAD;
595 break;
596 case Opt_test_dummy_encryption:
597 #ifdef CONFIG_FS_ENCRYPTION
598 fscrypt_free_dummy_policy(&fsopt->dummy_enc_policy);
599 ret = fscrypt_parse_test_dummy_encryption(param,
600 &fsopt->dummy_enc_policy);
601 if (ret == -EINVAL) {
602 warnfc(fc, "Value of option \"%s\" is unrecognized",
603 param->key);
604 } else if (ret == -EEXIST) {
605 warnfc(fc, "Conflicting test_dummy_encryption options");
606 ret = -EINVAL;
607 }
608 #else
609 warnfc(fc,
610 "FS encryption not supported: test_dummy_encryption mount option ignored");
611 #endif
612 break;
613 default:
614 BUG();
615 }
616 return 0;
617
618 out_of_range:
619 return invalfc(fc, "%s out of range", param->key);
620 }
621
destroy_mount_options(struct ceph_mount_options * args)622 static void destroy_mount_options(struct ceph_mount_options *args)
623 {
624 dout("destroy_mount_options %p\n", args);
625 if (!args)
626 return;
627
628 kfree(args->snapdir_name);
629 kfree(args->mds_namespace);
630 kfree(args->server_path);
631 kfree(args->fscache_uniq);
632 kfree(args->mon_addr);
633 fscrypt_free_dummy_policy(&args->dummy_enc_policy);
634 kfree(args);
635 }
636
strcmp_null(const char * s1,const char * s2)637 static int strcmp_null(const char *s1, const char *s2)
638 {
639 if (!s1 && !s2)
640 return 0;
641 if (s1 && !s2)
642 return -1;
643 if (!s1 && s2)
644 return 1;
645 return strcmp(s1, s2);
646 }
647
compare_mount_options(struct ceph_mount_options * new_fsopt,struct ceph_options * new_opt,struct ceph_fs_client * fsc)648 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
649 struct ceph_options *new_opt,
650 struct ceph_fs_client *fsc)
651 {
652 struct ceph_mount_options *fsopt1 = new_fsopt;
653 struct ceph_mount_options *fsopt2 = fsc->mount_options;
654 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
655 int ret;
656
657 ret = memcmp(fsopt1, fsopt2, ofs);
658 if (ret)
659 return ret;
660
661 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
662 if (ret)
663 return ret;
664
665 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
666 if (ret)
667 return ret;
668
669 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
670 if (ret)
671 return ret;
672
673 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
674 if (ret)
675 return ret;
676
677 ret = strcmp_null(fsopt1->mon_addr, fsopt2->mon_addr);
678 if (ret)
679 return ret;
680
681 return ceph_compare_options(new_opt, fsc->client);
682 }
683
684 /**
685 * ceph_show_options - Show mount options in /proc/mounts
686 * @m: seq_file to write to
687 * @root: root of that (sub)tree
688 */
ceph_show_options(struct seq_file * m,struct dentry * root)689 static int ceph_show_options(struct seq_file *m, struct dentry *root)
690 {
691 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(root->d_sb);
692 struct ceph_mount_options *fsopt = fsc->mount_options;
693 size_t pos;
694 int ret;
695
696 /* a comma between MNT/MS and client options */
697 seq_putc(m, ',');
698 pos = m->count;
699
700 ret = ceph_print_client_options(m, fsc->client, false);
701 if (ret)
702 return ret;
703
704 /* retract our comma if no client options */
705 if (m->count == pos)
706 m->count--;
707
708 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
709 seq_puts(m, ",dirstat");
710 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
711 seq_puts(m, ",rbytes");
712 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
713 seq_puts(m, ",noasyncreaddir");
714 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
715 seq_puts(m, ",nodcache");
716 if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
717 seq_puts(m, ",ino32");
718 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
719 seq_show_option(m, "fsc", fsopt->fscache_uniq);
720 }
721 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
722 seq_puts(m, ",nopoolperm");
723 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
724 seq_puts(m, ",noquotadf");
725
726 #ifdef CONFIG_CEPH_FS_POSIX_ACL
727 if (root->d_sb->s_flags & SB_POSIXACL)
728 seq_puts(m, ",acl");
729 else
730 seq_puts(m, ",noacl");
731 #endif
732
733 if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
734 seq_puts(m, ",copyfrom");
735
736 /* dump mds_namespace when old device syntax is in use */
737 if (fsopt->mds_namespace && !fsopt->new_dev_syntax)
738 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
739
740 if (fsopt->mon_addr)
741 seq_printf(m, ",mon_addr=%s", fsopt->mon_addr);
742
743 if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
744 seq_show_option(m, "recover_session", "clean");
745
746 if (!(fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS))
747 seq_puts(m, ",wsync");
748 if (fsopt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
749 seq_puts(m, ",nopagecache");
750 if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
751 seq_puts(m, ",sparseread");
752
753 fscrypt_show_test_dummy_encryption(m, ',', root->d_sb);
754
755 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
756 seq_printf(m, ",wsize=%u", fsopt->wsize);
757 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
758 seq_printf(m, ",rsize=%u", fsopt->rsize);
759 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
760 seq_printf(m, ",rasize=%u", fsopt->rasize);
761 if (fsopt->congestion_kb != default_congestion_kb())
762 seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
763 if (fsopt->caps_max)
764 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
765 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
766 seq_printf(m, ",caps_wanted_delay_min=%u",
767 fsopt->caps_wanted_delay_min);
768 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
769 seq_printf(m, ",caps_wanted_delay_max=%u",
770 fsopt->caps_wanted_delay_max);
771 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
772 seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
773 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
774 seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
775 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
776 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
777
778 return 0;
779 }
780
781 /*
782 * handle any mon messages the standard library doesn't understand.
783 * return error if we don't either.
784 */
extra_mon_dispatch(struct ceph_client * client,struct ceph_msg * msg)785 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
786 {
787 struct ceph_fs_client *fsc = client->private;
788 int type = le16_to_cpu(msg->hdr.type);
789
790 switch (type) {
791 case CEPH_MSG_MDS_MAP:
792 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
793 return 0;
794 case CEPH_MSG_FS_MAP_USER:
795 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
796 return 0;
797 default:
798 return -1;
799 }
800 }
801
802 /*
803 * create a new fs client
804 *
805 * Success or not, this function consumes @fsopt and @opt.
806 */
create_fs_client(struct ceph_mount_options * fsopt,struct ceph_options * opt)807 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
808 struct ceph_options *opt)
809 {
810 struct ceph_fs_client *fsc;
811 int err;
812
813 fsc = kzalloc_obj(*fsc);
814 if (!fsc) {
815 err = -ENOMEM;
816 goto fail;
817 }
818
819 fsc->client = ceph_create_client(opt, fsc);
820 if (IS_ERR(fsc->client)) {
821 err = PTR_ERR(fsc->client);
822 goto fail;
823 }
824 opt = NULL; /* fsc->client now owns this */
825
826 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
827 ceph_set_opt(fsc->client, ABORT_ON_FULL);
828
829 if (!fsopt->mds_namespace) {
830 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
831 0, true);
832 } else {
833 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
834 0, false);
835 }
836
837 fsc->mount_options = fsopt;
838
839 fsc->sb = NULL;
840 fsc->mount_state = CEPH_MOUNT_MOUNTING;
841 fsc->filp_gen = 1;
842 fsc->have_copy_from2 = true;
843
844 atomic_long_set(&fsc->writeback_count, 0);
845 fsc->write_congested = false;
846
847 err = -ENOMEM;
848 /*
849 * The number of concurrent works can be high but they don't need
850 * to be processed in parallel, limit concurrency.
851 */
852 fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
853 if (!fsc->inode_wq)
854 goto fail_client;
855 fsc->cap_wq = alloc_workqueue("ceph-cap", WQ_PERCPU, 1);
856 if (!fsc->cap_wq)
857 goto fail_inode_wq;
858
859 hash_init(fsc->async_unlink_conflict);
860 spin_lock_init(&fsc->async_unlink_conflict_lock);
861
862 spin_lock(&ceph_fsc_lock);
863 list_add_tail(&fsc->metric_wakeup, &ceph_fsc_list);
864 spin_unlock(&ceph_fsc_lock);
865
866 return fsc;
867
868 fail_inode_wq:
869 destroy_workqueue(fsc->inode_wq);
870 fail_client:
871 ceph_destroy_client(fsc->client);
872 fail:
873 kfree(fsc);
874 if (opt)
875 ceph_destroy_options(opt);
876 destroy_mount_options(fsopt);
877 return ERR_PTR(err);
878 }
879
flush_fs_workqueues(struct ceph_fs_client * fsc)880 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
881 {
882 flush_workqueue(fsc->inode_wq);
883 flush_workqueue(fsc->cap_wq);
884 }
885
destroy_fs_client(struct ceph_fs_client * fsc)886 static void destroy_fs_client(struct ceph_fs_client *fsc)
887 {
888 doutc(fsc->client, "%p\n", fsc);
889
890 spin_lock(&ceph_fsc_lock);
891 list_del(&fsc->metric_wakeup);
892 spin_unlock(&ceph_fsc_lock);
893
894 ceph_mdsc_destroy(fsc);
895 destroy_workqueue(fsc->inode_wq);
896 destroy_workqueue(fsc->cap_wq);
897
898 destroy_mount_options(fsc->mount_options);
899
900 ceph_destroy_client(fsc->client);
901
902 kfree(fsc);
903 dout("%s: %p done\n", __func__, fsc);
904 }
905
906 /*
907 * caches
908 */
909 struct kmem_cache *ceph_inode_cachep;
910 struct kmem_cache *ceph_cap_cachep;
911 struct kmem_cache *ceph_cap_snap_cachep;
912 struct kmem_cache *ceph_cap_flush_cachep;
913 struct kmem_cache *ceph_dentry_cachep;
914 struct kmem_cache *ceph_file_cachep;
915 struct kmem_cache *ceph_dir_file_cachep;
916 struct kmem_cache *ceph_mds_request_cachep;
917 mempool_t *ceph_wb_pagevec_pool;
918
ceph_inode_init_once(void * foo)919 static void ceph_inode_init_once(void *foo)
920 {
921 struct ceph_inode_info *ci = foo;
922 inode_init_once(&ci->netfs.inode);
923 }
924
init_caches(void)925 static int __init init_caches(void)
926 {
927 int error = -ENOMEM;
928
929 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
930 sizeof(struct ceph_inode_info),
931 __alignof__(struct ceph_inode_info),
932 SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
933 ceph_inode_init_once);
934 if (!ceph_inode_cachep)
935 return -ENOMEM;
936
937 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 0);
938 if (!ceph_cap_cachep)
939 goto bad_cap;
940 ceph_cap_snap_cachep = KMEM_CACHE(ceph_cap_snap, 0);
941 if (!ceph_cap_snap_cachep)
942 goto bad_cap_snap;
943 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
944 SLAB_RECLAIM_ACCOUNT);
945 if (!ceph_cap_flush_cachep)
946 goto bad_cap_flush;
947
948 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
949 SLAB_RECLAIM_ACCOUNT);
950 if (!ceph_dentry_cachep)
951 goto bad_dentry;
952
953 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 0);
954 if (!ceph_file_cachep)
955 goto bad_file;
956
957 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, 0);
958 if (!ceph_dir_file_cachep)
959 goto bad_dir_file;
960
961 ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, 0);
962 if (!ceph_mds_request_cachep)
963 goto bad_mds_req;
964
965 ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(10,
966 (CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT) * sizeof(struct page *));
967 if (!ceph_wb_pagevec_pool)
968 goto bad_pagevec_pool;
969
970 error = ceph_subvolume_metrics_cache_init();
971 if (error)
972 goto bad_subvol_metrics;
973
974 return 0;
975
976 bad_subvol_metrics:
977 mempool_destroy(ceph_wb_pagevec_pool);
978 bad_pagevec_pool:
979 kmem_cache_destroy(ceph_mds_request_cachep);
980 bad_mds_req:
981 kmem_cache_destroy(ceph_dir_file_cachep);
982 bad_dir_file:
983 kmem_cache_destroy(ceph_file_cachep);
984 bad_file:
985 kmem_cache_destroy(ceph_dentry_cachep);
986 bad_dentry:
987 kmem_cache_destroy(ceph_cap_flush_cachep);
988 bad_cap_flush:
989 kmem_cache_destroy(ceph_cap_snap_cachep);
990 bad_cap_snap:
991 kmem_cache_destroy(ceph_cap_cachep);
992 bad_cap:
993 kmem_cache_destroy(ceph_inode_cachep);
994 return error;
995 }
996
destroy_caches(void)997 static void destroy_caches(void)
998 {
999 /*
1000 * Make sure all delayed rcu free inodes are flushed before we
1001 * destroy cache.
1002 */
1003 rcu_barrier();
1004
1005 kmem_cache_destroy(ceph_inode_cachep);
1006 kmem_cache_destroy(ceph_cap_cachep);
1007 kmem_cache_destroy(ceph_cap_snap_cachep);
1008 kmem_cache_destroy(ceph_cap_flush_cachep);
1009 kmem_cache_destroy(ceph_dentry_cachep);
1010 kmem_cache_destroy(ceph_file_cachep);
1011 kmem_cache_destroy(ceph_dir_file_cachep);
1012 kmem_cache_destroy(ceph_mds_request_cachep);
1013 mempool_destroy(ceph_wb_pagevec_pool);
1014 ceph_subvolume_metrics_cache_destroy();
1015 }
1016
__ceph_umount_begin(struct ceph_fs_client * fsc)1017 static void __ceph_umount_begin(struct ceph_fs_client *fsc)
1018 {
1019 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
1020 ceph_mdsc_force_umount(fsc->mdsc);
1021 fsc->filp_gen++; // invalidate open files
1022 }
1023
1024 /*
1025 * ceph_umount_begin - initiate forced umount. Tear down the
1026 * mount, skipping steps that may hang while waiting for server(s).
1027 */
ceph_umount_begin(struct super_block * sb)1028 void ceph_umount_begin(struct super_block *sb)
1029 {
1030 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1031
1032 doutc(fsc->client, "starting forced umount\n");
1033
1034 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
1035 __ceph_umount_begin(fsc);
1036 }
1037
1038 static const struct super_operations ceph_super_ops = {
1039 .alloc_inode = ceph_alloc_inode,
1040 .free_inode = ceph_free_inode,
1041 .write_inode = ceph_write_inode,
1042 .drop_inode = inode_just_drop,
1043 .evict_inode = ceph_evict_inode,
1044 .sync_fs = ceph_sync_fs,
1045 .put_super = ceph_put_super,
1046 .show_options = ceph_show_options,
1047 .statfs = ceph_statfs,
1048 .umount_begin = ceph_umount_begin,
1049 };
1050
1051 /*
1052 * Bootstrap mount by opening the root directory. Note the mount
1053 * @started time from caller, and time out if this takes too long.
1054 */
open_root_dentry(struct ceph_fs_client * fsc,const char * path,unsigned long started)1055 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
1056 const char *path,
1057 unsigned long started)
1058 {
1059 struct ceph_client *cl = fsc->client;
1060 struct ceph_mds_client *mdsc = fsc->mdsc;
1061 struct ceph_mds_request *req = NULL;
1062 int err;
1063 struct dentry *root;
1064
1065 /* open dir */
1066 doutc(cl, "opening '%s'\n", path);
1067 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1068 if (IS_ERR(req))
1069 return ERR_CAST(req);
1070 req->r_path1 = kstrdup(path, GFP_NOFS);
1071 if (!req->r_path1) {
1072 root = ERR_PTR(-ENOMEM);
1073 goto out;
1074 }
1075
1076 req->r_ino1.ino = CEPH_INO_ROOT;
1077 req->r_ino1.snap = CEPH_NOSNAP;
1078 req->r_started = started;
1079 req->r_timeout = fsc->client->options->mount_timeout;
1080 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
1081 req->r_num_caps = 2;
1082 err = ceph_mdsc_do_request(mdsc, NULL, req);
1083 if (err == 0) {
1084 struct inode *inode = req->r_target_inode;
1085 req->r_target_inode = NULL;
1086 doutc(cl, "success\n");
1087 root = d_make_root(inode);
1088 if (!root) {
1089 root = ERR_PTR(-ENOMEM);
1090 goto out;
1091 }
1092 doutc(cl, "success, root dentry is %p\n", root);
1093 } else {
1094 root = ERR_PTR(err);
1095 }
1096 out:
1097 ceph_mdsc_put_request(req);
1098 return root;
1099 }
1100
1101 #ifdef CONFIG_FS_ENCRYPTION
ceph_apply_test_dummy_encryption(struct super_block * sb,struct fs_context * fc,struct ceph_mount_options * fsopt)1102 static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1103 struct fs_context *fc,
1104 struct ceph_mount_options *fsopt)
1105 {
1106 struct ceph_fs_client *fsc = sb->s_fs_info;
1107
1108 if (!fscrypt_is_dummy_policy_set(&fsopt->dummy_enc_policy))
1109 return 0;
1110
1111 /* No changing encryption context on remount. */
1112 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE &&
1113 !fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
1114 if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
1115 &fsc->fsc_dummy_enc_policy))
1116 return 0;
1117 errorfc(fc, "Can't set test_dummy_encryption on remount");
1118 return -EINVAL;
1119 }
1120
1121 /* Also make sure fsopt doesn't contain a conflicting value. */
1122 if (fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
1123 if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
1124 &fsc->fsc_dummy_enc_policy))
1125 return 0;
1126 errorfc(fc, "Conflicting test_dummy_encryption options");
1127 return -EINVAL;
1128 }
1129
1130 fsc->fsc_dummy_enc_policy = fsopt->dummy_enc_policy;
1131 memset(&fsopt->dummy_enc_policy, 0, sizeof(fsopt->dummy_enc_policy));
1132
1133 warnfc(fc, "test_dummy_encryption mode enabled");
1134 return 0;
1135 }
1136 #else
ceph_apply_test_dummy_encryption(struct super_block * sb,struct fs_context * fc,struct ceph_mount_options * fsopt)1137 static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1138 struct fs_context *fc,
1139 struct ceph_mount_options *fsopt)
1140 {
1141 return 0;
1142 }
1143 #endif
1144
1145 /*
1146 * mount: join the ceph cluster, and open root directory.
1147 */
ceph_real_mount(struct ceph_fs_client * fsc,struct fs_context * fc)1148 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
1149 struct fs_context *fc)
1150 {
1151 struct ceph_client *cl = fsc->client;
1152 int err;
1153 unsigned long started = jiffies; /* note the start time */
1154 struct dentry *root;
1155
1156 doutc(cl, "mount start %p\n", fsc);
1157 mutex_lock(&fsc->client->mount_mutex);
1158
1159 if (!fsc->sb->s_root) {
1160 const char *path = fsc->mount_options->server_path ?
1161 fsc->mount_options->server_path + 1 : "";
1162
1163 err = __ceph_open_session(fsc->client);
1164 if (err < 0)
1165 goto out;
1166
1167 /* setup fscache */
1168 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
1169 err = ceph_fscache_register_fs(fsc, fc);
1170 if (err < 0)
1171 goto out;
1172 }
1173
1174 err = ceph_apply_test_dummy_encryption(fsc->sb, fc,
1175 fsc->mount_options);
1176 if (err)
1177 goto out;
1178
1179 doutc(cl, "mount opening path '%s'\n", path);
1180
1181 ceph_fs_debugfs_init(fsc);
1182
1183 root = open_root_dentry(fsc, path, started);
1184 if (IS_ERR(root)) {
1185 err = PTR_ERR(root);
1186 goto out;
1187 }
1188 fsc->sb->s_root = dget(root);
1189 } else {
1190 root = dget(fsc->sb->s_root);
1191 }
1192
1193 fsc->mount_state = CEPH_MOUNT_MOUNTED;
1194 doutc(cl, "mount success\n");
1195 mutex_unlock(&fsc->client->mount_mutex);
1196 return root;
1197
1198 out:
1199 mutex_unlock(&fsc->client->mount_mutex);
1200 ceph_fscrypt_free_dummy_policy(fsc);
1201 return ERR_PTR(err);
1202 }
1203
ceph_set_super(struct super_block * s,struct fs_context * fc)1204 static int ceph_set_super(struct super_block *s, struct fs_context *fc)
1205 {
1206 struct ceph_fs_client *fsc = s->s_fs_info;
1207 struct ceph_client *cl = fsc->client;
1208 int ret;
1209
1210 doutc(cl, "%p\n", s);
1211
1212 s->s_maxbytes = MAX_LFS_FILESIZE;
1213
1214 s->s_xattr = ceph_xattr_handlers;
1215 fsc->sb = s;
1216 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
1217
1218 s->s_op = &ceph_super_ops;
1219 set_default_d_op(s, &ceph_dentry_ops);
1220 s->s_export_op = &ceph_export_ops;
1221
1222 s->s_time_gran = 1;
1223 s->s_time_min = 0;
1224 s->s_time_max = U32_MAX;
1225 s->s_flags |= SB_NODIRATIME | SB_NOATIME;
1226 s->s_magic = CEPH_SUPER_MAGIC;
1227
1228 ceph_fscrypt_set_ops(s);
1229
1230 ret = set_anon_super_fc(s, fc);
1231 if (ret != 0)
1232 fsc->sb = NULL;
1233 return ret;
1234 }
1235
1236 /*
1237 * share superblock if same fs AND options
1238 */
ceph_compare_super(struct super_block * sb,struct fs_context * fc)1239 static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
1240 {
1241 struct ceph_fs_client *new = fc->s_fs_info;
1242 struct ceph_mount_options *fsopt = new->mount_options;
1243 struct ceph_options *opt = new->client->options;
1244 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1245 struct ceph_client *cl = fsc->client;
1246
1247 doutc(cl, "%p\n", sb);
1248
1249 if (compare_mount_options(fsopt, opt, fsc)) {
1250 doutc(cl, "monitor(s)/mount options don't match\n");
1251 return 0;
1252 }
1253 if ((opt->flags & CEPH_OPT_FSID) &&
1254 ceph_fsid_compare(&opt->fsid, &fsc->client->fsid)) {
1255 doutc(cl, "fsid doesn't match\n");
1256 return 0;
1257 }
1258 if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
1259 doutc(cl, "flags differ\n");
1260 return 0;
1261 }
1262
1263 if (fsc->blocklisted && !ceph_test_mount_opt(fsc, CLEANRECOVER)) {
1264 doutc(cl, "client is blocklisted (and CLEANRECOVER is not set)\n");
1265 return 0;
1266 }
1267
1268 if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) {
1269 doutc(cl, "client has been forcibly unmounted\n");
1270 return 0;
1271 }
1272
1273 return 1;
1274 }
1275
1276 /*
1277 * construct our own bdi so we can control readahead, etc.
1278 */
1279 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1280
ceph_setup_bdi(struct super_block * sb,struct ceph_fs_client * fsc)1281 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1282 {
1283 int err;
1284
1285 err = super_setup_bdi_name(sb, "ceph-%ld",
1286 atomic_long_inc_return(&bdi_seq));
1287 if (err)
1288 return err;
1289
1290 /* set ra_pages based on rasize mount option? */
1291 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1292
1293 /* set io_pages based on max osd read size */
1294 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1295
1296 return 0;
1297 }
1298
ceph_get_tree(struct fs_context * fc)1299 static int ceph_get_tree(struct fs_context *fc)
1300 {
1301 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1302 struct ceph_mount_options *fsopt = pctx->opts;
1303 struct super_block *sb;
1304 struct ceph_fs_client *fsc;
1305 struct dentry *res;
1306 int (*compare_super)(struct super_block *, struct fs_context *) =
1307 ceph_compare_super;
1308 int err;
1309
1310 dout("ceph_get_tree\n");
1311
1312 if (!fc->source)
1313 return invalfc(fc, "No source");
1314 if (fsopt->new_dev_syntax && !fsopt->mon_addr)
1315 return invalfc(fc, "No monitor address");
1316
1317 /* create client (which we may/may not use) */
1318 fsc = create_fs_client(pctx->opts, pctx->copts);
1319 pctx->opts = NULL;
1320 pctx->copts = NULL;
1321 if (IS_ERR(fsc)) {
1322 err = PTR_ERR(fsc);
1323 goto out_final;
1324 }
1325
1326 err = ceph_mdsc_init(fsc);
1327 if (err < 0)
1328 goto out;
1329
1330 if (ceph_test_opt(fsc->client, NOSHARE))
1331 compare_super = NULL;
1332
1333 fc->s_fs_info = fsc;
1334 sb = sget_fc(fc, compare_super, ceph_set_super);
1335 fc->s_fs_info = NULL;
1336 if (IS_ERR(sb)) {
1337 err = PTR_ERR(sb);
1338 goto out;
1339 }
1340
1341 if (ceph_sb_to_fs_client(sb) != fsc) {
1342 destroy_fs_client(fsc);
1343 fsc = ceph_sb_to_fs_client(sb);
1344 dout("get_sb got existing client %p\n", fsc);
1345 } else {
1346 dout("get_sb using new client %p\n", fsc);
1347 err = ceph_setup_bdi(sb, fsc);
1348 if (err < 0)
1349 goto out_splat;
1350 }
1351
1352 res = ceph_real_mount(fsc, fc);
1353 if (IS_ERR(res)) {
1354 err = PTR_ERR(res);
1355 goto out_splat;
1356 }
1357
1358 doutc(fsc->client, "root %p inode %p ino %llx.%llx\n", res,
1359 d_inode(res), ceph_vinop(d_inode(res)));
1360 fc->root = fsc->sb->s_root;
1361 return 0;
1362
1363 out_splat:
1364 if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
1365 pr_info("No mds server is up or the cluster is laggy\n");
1366 err = -EHOSTUNREACH;
1367 }
1368
1369 ceph_mdsc_close_sessions(fsc->mdsc);
1370 deactivate_locked_super(sb);
1371 goto out_final;
1372
1373 out:
1374 destroy_fs_client(fsc);
1375 out_final:
1376 dout("ceph_get_tree fail %d\n", err);
1377 return err;
1378 }
1379
ceph_free_fc(struct fs_context * fc)1380 static void ceph_free_fc(struct fs_context *fc)
1381 {
1382 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1383
1384 if (pctx) {
1385 destroy_mount_options(pctx->opts);
1386 ceph_destroy_options(pctx->copts);
1387 kfree(pctx);
1388 }
1389 }
1390
ceph_reconfigure_fc(struct fs_context * fc)1391 static int ceph_reconfigure_fc(struct fs_context *fc)
1392 {
1393 int err;
1394 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1395 struct ceph_mount_options *fsopt = pctx->opts;
1396 struct super_block *sb = fc->root->d_sb;
1397 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1398
1399 err = ceph_apply_test_dummy_encryption(sb, fc, fsopt);
1400 if (err)
1401 return err;
1402
1403 if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1404 ceph_set_mount_opt(fsc, ASYNC_DIROPS);
1405 else
1406 ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
1407
1408 if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
1409 ceph_set_mount_opt(fsc, SPARSEREAD);
1410 else
1411 ceph_clear_mount_opt(fsc, SPARSEREAD);
1412
1413 if (strcmp_null(fsc->mount_options->mon_addr, fsopt->mon_addr)) {
1414 kfree(fsc->mount_options->mon_addr);
1415 fsc->mount_options->mon_addr = fsopt->mon_addr;
1416 fsopt->mon_addr = NULL;
1417 pr_notice_client(fsc->client,
1418 "monitor addresses recorded, but not used for reconnection");
1419 }
1420
1421 sync_filesystem(sb);
1422 return 0;
1423 }
1424
1425 static const struct fs_context_operations ceph_context_ops = {
1426 .free = ceph_free_fc,
1427 .parse_param = ceph_parse_mount_param,
1428 .get_tree = ceph_get_tree,
1429 .reconfigure = ceph_reconfigure_fc,
1430 };
1431
1432 /*
1433 * Set up the filesystem mount context.
1434 */
ceph_init_fs_context(struct fs_context * fc)1435 static int ceph_init_fs_context(struct fs_context *fc)
1436 {
1437 struct ceph_parse_opts_ctx *pctx;
1438 struct ceph_mount_options *fsopt;
1439
1440 pctx = kzalloc_obj(*pctx);
1441 if (!pctx)
1442 return -ENOMEM;
1443
1444 pctx->copts = ceph_alloc_options();
1445 if (!pctx->copts)
1446 goto nomem;
1447
1448 pctx->opts = kzalloc_obj(*pctx->opts);
1449 if (!pctx->opts)
1450 goto nomem;
1451
1452 fsopt = pctx->opts;
1453 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1454
1455 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1456 fsopt->rsize = CEPH_MAX_READ_SIZE;
1457 fsopt->rasize = CEPH_RASIZE_DEFAULT;
1458 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1459 if (!fsopt->snapdir_name)
1460 goto nomem;
1461
1462 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1463 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1464 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1465 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1466 fsopt->congestion_kb = default_congestion_kb();
1467
1468 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1469 fc->sb_flags |= SB_POSIXACL;
1470 #endif
1471
1472 fc->fs_private = pctx;
1473 fc->ops = &ceph_context_ops;
1474 return 0;
1475
1476 nomem:
1477 destroy_mount_options(pctx->opts);
1478 ceph_destroy_options(pctx->copts);
1479 kfree(pctx);
1480 return -ENOMEM;
1481 }
1482
1483 /*
1484 * Return true if it successfully increases the blocker counter,
1485 * or false if the mdsc is in stopping and flushed state.
1486 */
__inc_stopping_blocker(struct ceph_mds_client * mdsc)1487 static bool __inc_stopping_blocker(struct ceph_mds_client *mdsc)
1488 {
1489 spin_lock(&mdsc->stopping_lock);
1490 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING) {
1491 spin_unlock(&mdsc->stopping_lock);
1492 return false;
1493 }
1494 atomic_inc(&mdsc->stopping_blockers);
1495 spin_unlock(&mdsc->stopping_lock);
1496 return true;
1497 }
1498
__dec_stopping_blocker(struct ceph_mds_client * mdsc)1499 static void __dec_stopping_blocker(struct ceph_mds_client *mdsc)
1500 {
1501 spin_lock(&mdsc->stopping_lock);
1502 if (!atomic_dec_return(&mdsc->stopping_blockers) &&
1503 mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING)
1504 complete_all(&mdsc->stopping_waiter);
1505 spin_unlock(&mdsc->stopping_lock);
1506 }
1507
1508 /* For metadata IO requests */
ceph_inc_mds_stopping_blocker(struct ceph_mds_client * mdsc,struct ceph_mds_session * session)1509 bool ceph_inc_mds_stopping_blocker(struct ceph_mds_client *mdsc,
1510 struct ceph_mds_session *session)
1511 {
1512 mutex_lock(&session->s_mutex);
1513 inc_session_sequence(session);
1514 mutex_unlock(&session->s_mutex);
1515
1516 return __inc_stopping_blocker(mdsc);
1517 }
1518
ceph_dec_mds_stopping_blocker(struct ceph_mds_client * mdsc)1519 void ceph_dec_mds_stopping_blocker(struct ceph_mds_client *mdsc)
1520 {
1521 __dec_stopping_blocker(mdsc);
1522 }
1523
1524 /* For data IO requests */
ceph_inc_osd_stopping_blocker(struct ceph_mds_client * mdsc)1525 bool ceph_inc_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1526 {
1527 return __inc_stopping_blocker(mdsc);
1528 }
1529
ceph_dec_osd_stopping_blocker(struct ceph_mds_client * mdsc)1530 void ceph_dec_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1531 {
1532 __dec_stopping_blocker(mdsc);
1533 }
1534
ceph_kill_sb(struct super_block * s)1535 static void ceph_kill_sb(struct super_block *s)
1536 {
1537 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(s);
1538 struct ceph_client *cl = fsc->client;
1539 struct ceph_mds_client *mdsc = fsc->mdsc;
1540 bool wait;
1541
1542 doutc(cl, "%p\n", s);
1543
1544 ceph_mdsc_pre_umount(mdsc);
1545 flush_fs_workqueues(fsc);
1546
1547 /*
1548 * Though the kill_anon_super() will finally trigger the
1549 * sync_filesystem() anyway, we still need to do it here and
1550 * then bump the stage of shutdown. This will allow us to
1551 * drop any further message, which will increase the inodes'
1552 * i_count reference counters but makes no sense any more,
1553 * from MDSs.
1554 *
1555 * Without this when evicting the inodes it may fail in the
1556 * kill_anon_super(), which will trigger a warning when
1557 * destroying the fscrypt keyring and then possibly trigger
1558 * a further crash in ceph module when the iput() tries to
1559 * evict the inodes later.
1560 */
1561 sync_filesystem(s);
1562
1563 if (atomic64_read(&mdsc->dirty_folios) > 0) {
1564 wait_queue_head_t *wq = &mdsc->flush_end_wq;
1565 long timeleft = wait_event_killable_timeout(*wq,
1566 atomic64_read(&mdsc->dirty_folios) <= 0,
1567 fsc->client->options->mount_timeout);
1568 if (!timeleft) /* timed out */
1569 pr_warn_client(cl, "umount timed out, %ld\n", timeleft);
1570 else if (timeleft < 0) /* killed */
1571 pr_warn_client(cl, "umount was killed, %ld\n", timeleft);
1572 }
1573
1574 spin_lock(&mdsc->stopping_lock);
1575 mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHING;
1576 wait = !!atomic_read(&mdsc->stopping_blockers);
1577 spin_unlock(&mdsc->stopping_lock);
1578
1579 if (wait && atomic_read(&mdsc->stopping_blockers)) {
1580 long timeleft = wait_for_completion_killable_timeout(
1581 &mdsc->stopping_waiter,
1582 fsc->client->options->mount_timeout);
1583 if (!timeleft) /* timed out */
1584 pr_warn_client(cl, "umount timed out, %ld\n", timeleft);
1585 else if (timeleft < 0) /* killed */
1586 pr_warn_client(cl, "umount was killed, %ld\n", timeleft);
1587 }
1588
1589 mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHED;
1590 kill_anon_super(s);
1591
1592 fsc->client->extra_mon_dispatch = NULL;
1593 ceph_fs_debugfs_cleanup(fsc);
1594
1595 ceph_fscache_unregister_fs(fsc);
1596
1597 destroy_fs_client(fsc);
1598 }
1599
1600 static struct file_system_type ceph_fs_type = {
1601 .owner = THIS_MODULE,
1602 .name = "ceph",
1603 .init_fs_context = ceph_init_fs_context,
1604 .kill_sb = ceph_kill_sb,
1605 .fs_flags = FS_RENAME_DOES_D_MOVE | FS_ALLOW_IDMAP,
1606 };
1607 MODULE_ALIAS_FS("ceph");
1608
ceph_force_reconnect(struct super_block * sb)1609 int ceph_force_reconnect(struct super_block *sb)
1610 {
1611 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1612 int err = 0;
1613
1614 fsc->mount_state = CEPH_MOUNT_RECOVER;
1615 __ceph_umount_begin(fsc);
1616
1617 /* Make sure all page caches get invalidated.
1618 * see remove_session_caps_cb() */
1619 flush_workqueue(fsc->inode_wq);
1620
1621 /* In case that we were blocklisted. This also reset
1622 * all mon/osd connections */
1623 ceph_reset_client_addr(fsc->client);
1624
1625 ceph_osdc_clear_abort_err(&fsc->client->osdc);
1626
1627 fsc->blocklisted = false;
1628 fsc->mount_state = CEPH_MOUNT_MOUNTED;
1629
1630 if (sb->s_root) {
1631 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1632 CEPH_STAT_CAP_INODE, true);
1633 }
1634 return err;
1635 }
1636
init_ceph(void)1637 static int __init init_ceph(void)
1638 {
1639 int ret = init_caches();
1640 if (ret)
1641 goto out;
1642
1643 ceph_flock_init();
1644 ret = register_filesystem(&ceph_fs_type);
1645 if (ret)
1646 goto out_caches;
1647
1648 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1649
1650 return 0;
1651
1652 out_caches:
1653 destroy_caches();
1654 out:
1655 return ret;
1656 }
1657
exit_ceph(void)1658 static void __exit exit_ceph(void)
1659 {
1660 dout("exit_ceph\n");
1661 unregister_filesystem(&ceph_fs_type);
1662 destroy_caches();
1663 }
1664
param_set_metrics(const char * val,const struct kernel_param * kp)1665 static int param_set_metrics(const char *val, const struct kernel_param *kp)
1666 {
1667 struct ceph_fs_client *fsc;
1668 int ret;
1669
1670 ret = param_set_bool(val, kp);
1671 if (ret) {
1672 pr_err("Failed to parse sending metrics switch value '%s'\n",
1673 val);
1674 return ret;
1675 } else if (!disable_send_metrics) {
1676 // wake up all the mds clients
1677 spin_lock(&ceph_fsc_lock);
1678 list_for_each_entry(fsc, &ceph_fsc_list, metric_wakeup) {
1679 metric_schedule_delayed(&fsc->mdsc->metric);
1680 }
1681 spin_unlock(&ceph_fsc_lock);
1682 }
1683
1684 return 0;
1685 }
1686
1687 static const struct kernel_param_ops param_ops_metrics = {
1688 .set = param_set_metrics,
1689 .get = param_get_bool,
1690 };
1691
1692 bool disable_send_metrics = false;
1693 module_param_cb(disable_send_metrics, ¶m_ops_metrics, &disable_send_metrics, 0644);
1694 MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
1695
1696 /* for both v1 and v2 syntax */
1697 static bool mount_support = true;
1698 static const struct kernel_param_ops param_ops_mount_syntax = {
1699 .get = param_get_bool,
1700 };
1701 module_param_cb(mount_syntax_v1, ¶m_ops_mount_syntax, &mount_support, 0444);
1702 module_param_cb(mount_syntax_v2, ¶m_ops_mount_syntax, &mount_support, 0444);
1703
1704 bool enable_unsafe_idmap = false;
1705 module_param(enable_unsafe_idmap, bool, 0644);
1706 MODULE_PARM_DESC(enable_unsafe_idmap,
1707 "Allow to use idmapped mounts with MDS without CEPHFS_FEATURE_HAS_OWNER_UIDGID");
1708
1709 module_init(init_ceph);
1710 module_exit(exit_ceph);
1711
1712 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1713 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1714 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1715 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1716 MODULE_LICENSE("GPL");
1717