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