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