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