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