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#define CREATE_TRACE_POINTS
34#include <trace/events/ceph.h>
35
36static DEFINE_SPINLOCK(ceph_fsc_lock);
37static LIST_HEAD(ceph_fsc_list);
38
39/*
40 * Ceph superblock operations
41 *
42 * Handle the basics of mounting, unmounting.
43 */
44
45/*
46 * super ops
47 */
48static void ceph_put_super(struct super_block *s)
49{
50 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb: s);
51
52 doutc(fsc->client, "begin\n");
53 ceph_fscrypt_free_dummy_policy(fsc);
54 ceph_mdsc_close_sessions(mdsc: fsc->mdsc);
55 doutc(fsc->client, "done\n");
56}
57
58static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
59{
60 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode: d_inode(dentry));
61 struct ceph_mon_client *monc = &fsc->client->monc;
62 struct ceph_statfs st;
63 int i, err;
64 u64 data_pool;
65
66 doutc(fsc->client, "begin\n");
67 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
68 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
69 } else {
70 data_pool = CEPH_NOPOOL;
71 }
72
73 err = ceph_monc_do_statfs(monc, data_pool, buf: &st);
74 if (err < 0)
75 return err;
76
77 /* fill in kstatfs */
78 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
79
80 /*
81 * Express utilization in terms of large blocks to avoid
82 * overflow on 32-bit machines.
83 */
84 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
85
86 /*
87 * By default use root quota for stats; fallback to overall filesystem
88 * usage if using 'noquotadf' mount option or if the root dir doesn't
89 * have max_bytes quota set.
90 */
91 if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
92 !ceph_quota_update_statfs(fsc, buf)) {
93 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
94 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
95 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
96 }
97
98 /*
99 * NOTE: for the time being, we make bsize == frsize to humor
100 * not-yet-ancient versions of glibc that are broken.
101 * Someday, we will probably want to report a real block
102 * size... whatever that may mean for a network file system!
103 */
104 buf->f_bsize = buf->f_frsize;
105
106 buf->f_files = le64_to_cpu(st.num_objects);
107 buf->f_ffree = -1;
108 buf->f_namelen = NAME_MAX;
109
110 /* Must convert the fsid, for consistent values across arches */
111 buf->f_fsid.val[0] = 0;
112 mutex_lock(&monc->mutex);
113 for (i = 0 ; i < sizeof(monc->monmap->fsid) / sizeof(__le32) ; ++i)
114 buf->f_fsid.val[0] ^= le32_to_cpu(((__le32 *)&monc->monmap->fsid)[i]);
115 mutex_unlock(lock: &monc->mutex);
116
117 /* fold the fs_cluster_id into the upper bits */
118 buf->f_fsid.val[1] = monc->fs_cluster_id;
119
120 doutc(fsc->client, "done\n");
121 return 0;
122}
123
124static int ceph_sync_fs(struct super_block *sb, int wait)
125{
126 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
127 struct ceph_client *cl = fsc->client;
128
129 if (!wait) {
130 doutc(cl, "(non-blocking)\n");
131 ceph_flush_dirty_caps(mdsc: fsc->mdsc);
132 ceph_flush_cap_releases(mdsc: fsc->mdsc);
133 doutc(cl, "(non-blocking) done\n");
134 return 0;
135 }
136
137 doutc(cl, "(blocking)\n");
138 ceph_osdc_sync(osdc: &fsc->client->osdc);
139 ceph_mdsc_sync(mdsc: fsc->mdsc);
140 doutc(cl, "(blocking) done\n");
141 return 0;
142}
143
144/*
145 * mount options
146 */
147enum {
148 Opt_wsize,
149 Opt_rsize,
150 Opt_rasize,
151 Opt_caps_wanted_delay_min,
152 Opt_caps_wanted_delay_max,
153 Opt_caps_max,
154 Opt_readdir_max_entries,
155 Opt_readdir_max_bytes,
156 Opt_congestion_kb,
157 /* int args above */
158 Opt_snapdirname,
159 Opt_mds_namespace,
160 Opt_recover_session,
161 Opt_source,
162 Opt_mon_addr,
163 Opt_test_dummy_encryption,
164 /* string args above */
165 Opt_dirstat,
166 Opt_rbytes,
167 Opt_asyncreaddir,
168 Opt_dcache,
169 Opt_ino32,
170 Opt_fscache,
171 Opt_poolperm,
172 Opt_require_active_mds,
173 Opt_acl,
174 Opt_quotadf,
175 Opt_copyfrom,
176 Opt_wsync,
177 Opt_pagecache,
178 Opt_sparseread,
179};
180
181enum ceph_recover_session_mode {
182 ceph_recover_session_no,
183 ceph_recover_session_clean
184};
185
186static const struct constant_table ceph_param_recover[] = {
187 { "no", ceph_recover_session_no },
188 { "clean", ceph_recover_session_clean },
189 {}
190};
191
192static const struct fs_parameter_spec ceph_mount_parameters[] = {
193 fsparam_flag_no ("acl", Opt_acl),
194 fsparam_flag_no ("asyncreaddir", Opt_asyncreaddir),
195 fsparam_s32 ("caps_max", Opt_caps_max),
196 fsparam_u32 ("caps_wanted_delay_max", Opt_caps_wanted_delay_max),
197 fsparam_u32 ("caps_wanted_delay_min", Opt_caps_wanted_delay_min),
198 fsparam_u32 ("write_congestion_kb", Opt_congestion_kb),
199 fsparam_flag_no ("copyfrom", Opt_copyfrom),
200 fsparam_flag_no ("dcache", Opt_dcache),
201 fsparam_flag_no ("dirstat", Opt_dirstat),
202 fsparam_flag_no ("fsc", Opt_fscache), // fsc|nofsc
203 fsparam_string ("fsc", Opt_fscache), // fsc=...
204 fsparam_flag_no ("ino32", Opt_ino32),
205 fsparam_string ("mds_namespace", Opt_mds_namespace),
206 fsparam_string ("mon_addr", Opt_mon_addr),
207 fsparam_flag_no ("poolperm", Opt_poolperm),
208 fsparam_flag_no ("quotadf", Opt_quotadf),
209 fsparam_u32 ("rasize", Opt_rasize),
210 fsparam_flag_no ("rbytes", Opt_rbytes),
211 fsparam_u32 ("readdir_max_bytes", Opt_readdir_max_bytes),
212 fsparam_u32 ("readdir_max_entries", Opt_readdir_max_entries),
213 fsparam_enum ("recover_session", Opt_recover_session, ceph_param_recover),
214 fsparam_flag_no ("require_active_mds", Opt_require_active_mds),
215 fsparam_u32 ("rsize", Opt_rsize),
216 fsparam_string ("snapdirname", Opt_snapdirname),
217 fsparam_string ("source", Opt_source),
218 fsparam_flag ("test_dummy_encryption", Opt_test_dummy_encryption),
219 fsparam_string ("test_dummy_encryption", Opt_test_dummy_encryption),
220 fsparam_u32 ("wsize", Opt_wsize),
221 fsparam_flag_no ("wsync", Opt_wsync),
222 fsparam_flag_no ("pagecache", Opt_pagecache),
223 fsparam_flag_no ("sparseread", Opt_sparseread),
224 {}
225};
226
227struct ceph_parse_opts_ctx {
228 struct ceph_options *copts;
229 struct ceph_mount_options *opts;
230};
231
232/*
233 * Remove adjacent slashes and then the trailing slash, unless it is
234 * the only remaining character.
235 *
236 * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
237 */
238static void canonicalize_path(char *path)
239{
240 int i, j = 0;
241
242 for (i = 0; path[i] != '\0'; i++) {
243 if (path[i] != '/' || j < 1 || path[j - 1] != '/')
244 path[j++] = path[i];
245 }
246
247 if (j > 1 && path[j - 1] == '/')
248 j--;
249 path[j] = '\0';
250}
251
252static int ceph_parse_old_source(const char *dev_name, const char *dev_name_end,
253 struct fs_context *fc)
254{
255 int r;
256 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
257 struct ceph_mount_options *fsopt = pctx->opts;
258
259 if (*dev_name_end != ':')
260 return invalfc(fc, "separator ':' missing in source");
261
262 r = ceph_parse_mon_ips(buf: dev_name, len: dev_name_end - dev_name,
263 opt: pctx->copts, l: fc->log.log, delim: ',');
264 if (r)
265 return r;
266
267 fsopt->new_dev_syntax = false;
268 return 0;
269}
270
271static int ceph_parse_new_source(const char *dev_name, const char *dev_name_end,
272 struct fs_context *fc)
273{
274 size_t len;
275 struct ceph_fsid fsid;
276 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
277 struct ceph_options *opts = pctx->copts;
278 struct ceph_mount_options *fsopt = pctx->opts;
279 const char *name_start = dev_name;
280 const char *fsid_start, *fs_name_start;
281
282 if (*dev_name_end != '=') {
283 dout("separator '=' missing in source");
284 return -EINVAL;
285 }
286
287 fsid_start = strchr(dev_name, '@');
288 if (!fsid_start)
289 return invalfc(fc, "missing cluster fsid");
290 len = fsid_start - name_start;
291 kfree(objp: opts->name);
292 opts->name = kstrndup(s: name_start, len, GFP_KERNEL);
293 if (!opts->name)
294 return -ENOMEM;
295 dout("using %s entity name", opts->name);
296
297 ++fsid_start; /* start of cluster fsid */
298 fs_name_start = strchr(fsid_start, '.');
299 if (!fs_name_start)
300 return invalfc(fc, "missing file system name");
301
302 if (ceph_parse_fsid(str: fsid_start, fsid: &fsid))
303 return invalfc(fc, "Invalid FSID");
304
305 ++fs_name_start; /* start of file system name */
306 len = dev_name_end - fs_name_start;
307
308 if (!namespace_equals(fsopt, namespace: fs_name_start, len))
309 return invalfc(fc, "Mismatching mds_namespace");
310 kfree(objp: fsopt->mds_namespace);
311 fsopt->mds_namespace = kstrndup(s: fs_name_start, len, GFP_KERNEL);
312 if (!fsopt->mds_namespace)
313 return -ENOMEM;
314 dout("file system (mds namespace) '%s'\n", fsopt->mds_namespace);
315
316 fsopt->new_dev_syntax = true;
317 return 0;
318}
319
320/*
321 * Parse the source parameter for new device format. Distinguish the device
322 * spec from the path. Try parsing new device format and fallback to old
323 * format if needed.
324 *
325 * New device syntax will looks like:
326 * <device_spec>=/<path>
327 * where
328 * <device_spec> is name@fsid.fsname
329 * <path> is optional, but if present must begin with '/'
330 * (monitor addresses are passed via mount option)
331 *
332 * Old device syntax is:
333 * <server_spec>[,<server_spec>...]:[<path>]
334 * where
335 * <server_spec> is <ip>[:<port>]
336 * <path> is optional, but if present must begin with '/'
337 */
338static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
339{
340 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
341 struct ceph_mount_options *fsopt = pctx->opts;
342 char *dev_name = param->string, *dev_name_end;
343 int ret;
344
345 dout("'%s'\n", dev_name);
346 if (!dev_name || !*dev_name)
347 return invalfc(fc, "Empty source");
348
349 dev_name_end = strchr(dev_name, '/');
350 if (dev_name_end) {
351 /*
352 * The server_path will include the whole chars from userland
353 * including the leading '/'.
354 */
355 kfree(objp: fsopt->server_path);
356 fsopt->server_path = kstrdup(s: dev_name_end, GFP_KERNEL);
357 if (!fsopt->server_path)
358 return -ENOMEM;
359
360 canonicalize_path(path: fsopt->server_path);
361 } else {
362 dev_name_end = dev_name + strlen(dev_name);
363 }
364
365 dev_name_end--; /* back up to separator */
366 if (dev_name_end < dev_name)
367 return invalfc(fc, "Path missing in source");
368
369 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
370 if (fsopt->server_path)
371 dout("server path '%s'\n", fsopt->server_path);
372
373 dout("trying new device syntax");
374 ret = ceph_parse_new_source(dev_name, dev_name_end, fc);
375 if (ret) {
376 if (ret != -EINVAL)
377 return ret;
378 dout("trying old device syntax");
379 ret = ceph_parse_old_source(dev_name, dev_name_end, fc);
380 if (ret)
381 return ret;
382 }
383
384 fc->source = param->string;
385 param->string = NULL;
386 return 0;
387}
388
389static int ceph_parse_mon_addr(struct fs_parameter *param,
390 struct fs_context *fc)
391{
392 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
393 struct ceph_mount_options *fsopt = pctx->opts;
394
395 kfree(objp: fsopt->mon_addr);
396 fsopt->mon_addr = param->string;
397 param->string = NULL;
398
399 return ceph_parse_mon_ips(buf: fsopt->mon_addr, strlen(fsopt->mon_addr),
400 opt: pctx->copts, l: fc->log.log, delim: '/');
401}
402
403static int ceph_parse_mount_param(struct fs_context *fc,
404 struct fs_parameter *param)
405{
406 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
407 struct ceph_mount_options *fsopt = pctx->opts;
408 struct fs_parse_result result;
409 unsigned int mode;
410 int token, ret;
411
412 ret = ceph_parse_param(param, opt: pctx->copts, l: fc->log.log);
413 if (ret != -ENOPARAM)
414 return ret;
415
416 token = fs_parse(fc, desc: ceph_mount_parameters, param, result: &result);
417 dout("%s: fs_parse '%s' token %d\n",__func__, param->key, token);
418 if (token < 0)
419 return token;
420
421 switch (token) {
422 case Opt_snapdirname:
423 if (strlen(param->string) > NAME_MAX)
424 return invalfc(fc, "snapdirname too long");
425 kfree(objp: fsopt->snapdir_name);
426 fsopt->snapdir_name = param->string;
427 param->string = NULL;
428 break;
429 case Opt_mds_namespace:
430 if (!namespace_equals(fsopt, namespace: param->string, strlen(param->string)))
431 return invalfc(fc, "Mismatching mds_namespace");
432 kfree(objp: fsopt->mds_namespace);
433 fsopt->mds_namespace = param->string;
434 param->string = NULL;
435 break;
436 case Opt_recover_session:
437 mode = result.uint_32;
438 if (mode == ceph_recover_session_no)
439 fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
440 else if (mode == ceph_recover_session_clean)
441 fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
442 else
443 BUG();
444 break;
445 case Opt_source:
446 if (fc->source)
447 return invalfc(fc, "Multiple sources specified");
448 return ceph_parse_source(param, fc);
449 case Opt_mon_addr:
450 return ceph_parse_mon_addr(param, fc);
451 case Opt_wsize:
452 if (result.uint_32 < PAGE_SIZE ||
453 result.uint_32 > CEPH_MAX_WRITE_SIZE)
454 goto out_of_range;
455 fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
456 break;
457 case Opt_rsize:
458 if (result.uint_32 < PAGE_SIZE ||
459 result.uint_32 > CEPH_MAX_READ_SIZE)
460 goto out_of_range;
461 fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
462 break;
463 case Opt_rasize:
464 fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
465 break;
466 case Opt_caps_wanted_delay_min:
467 if (result.uint_32 < 1)
468 goto out_of_range;
469 fsopt->caps_wanted_delay_min = result.uint_32;
470 break;
471 case Opt_caps_wanted_delay_max:
472 if (result.uint_32 < 1)
473 goto out_of_range;
474 fsopt->caps_wanted_delay_max = result.uint_32;
475 break;
476 case Opt_caps_max:
477 if (result.int_32 < 0)
478 goto out_of_range;
479 fsopt->caps_max = result.int_32;
480 break;
481 case Opt_readdir_max_entries:
482 if (result.uint_32 < 1)
483 goto out_of_range;
484 fsopt->max_readdir = result.uint_32;
485 break;
486 case Opt_readdir_max_bytes:
487 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
488 goto out_of_range;
489 fsopt->max_readdir_bytes = result.uint_32;
490 break;
491 case Opt_congestion_kb:
492 if (result.uint_32 < 1024) /* at least 1M */
493 goto out_of_range;
494 fsopt->congestion_kb = result.uint_32;
495 break;
496 case Opt_dirstat:
497 if (!result.negated)
498 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
499 else
500 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
501 break;
502 case Opt_rbytes:
503 if (!result.negated)
504 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
505 else
506 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
507 break;
508 case Opt_asyncreaddir:
509 if (!result.negated)
510 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
511 else
512 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
513 break;
514 case Opt_dcache:
515 if (!result.negated)
516 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
517 else
518 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
519 break;
520 case Opt_ino32:
521 if (!result.negated)
522 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
523 else
524 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
525 break;
526
527 case Opt_fscache:
528#ifdef CONFIG_CEPH_FSCACHE
529 kfree(objp: fsopt->fscache_uniq);
530 fsopt->fscache_uniq = NULL;
531 if (result.negated) {
532 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
533 } else {
534 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
535 fsopt->fscache_uniq = param->string;
536 param->string = NULL;
537 }
538 break;
539#else
540 return invalfc(fc, "fscache support is disabled");
541#endif
542 case Opt_poolperm:
543 if (!result.negated)
544 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
545 else
546 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
547 break;
548 case Opt_require_active_mds:
549 if (!result.negated)
550 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
551 else
552 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
553 break;
554 case Opt_quotadf:
555 if (!result.negated)
556 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
557 else
558 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
559 break;
560 case Opt_copyfrom:
561 if (!result.negated)
562 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
563 else
564 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
565 break;
566 case Opt_acl:
567 if (!result.negated) {
568#ifdef CONFIG_CEPH_FS_POSIX_ACL
569 fc->sb_flags |= SB_POSIXACL;
570#else
571 return invalfc(fc, "POSIX ACL support is disabled");
572#endif
573 } else {
574 fc->sb_flags &= ~SB_POSIXACL;
575 }
576 break;
577 case Opt_wsync:
578 if (!result.negated)
579 fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
580 else
581 fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
582 break;
583 case Opt_pagecache:
584 if (result.negated)
585 fsopt->flags |= CEPH_MOUNT_OPT_NOPAGECACHE;
586 else
587 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPAGECACHE;
588 break;
589 case Opt_sparseread:
590 if (result.negated)
591 fsopt->flags &= ~CEPH_MOUNT_OPT_SPARSEREAD;
592 else
593 fsopt->flags |= CEPH_MOUNT_OPT_SPARSEREAD;
594 break;
595 case Opt_test_dummy_encryption:
596#ifdef CONFIG_FS_ENCRYPTION
597 fscrypt_free_dummy_policy(dummy_policy: &fsopt->dummy_enc_policy);
598 ret = fscrypt_parse_test_dummy_encryption(param,
599 dummy_policy: &fsopt->dummy_enc_policy);
600 if (ret == -EINVAL) {
601 warnfc(fc, "Value of option \"%s\" is unrecognized",
602 param->key);
603 } else if (ret == -EEXIST) {
604 warnfc(fc, "Conflicting test_dummy_encryption options");
605 ret = -EINVAL;
606 }
607#else
608 warnfc(fc,
609 "FS encryption not supported: test_dummy_encryption mount option ignored");
610#endif
611 break;
612 default:
613 BUG();
614 }
615 return 0;
616
617out_of_range:
618 return invalfc(fc, "%s out of range", param->key);
619}
620
621static void destroy_mount_options(struct ceph_mount_options *args)
622{
623 dout("destroy_mount_options %p\n", args);
624 if (!args)
625 return;
626
627 kfree(objp: args->snapdir_name);
628 kfree(objp: args->mds_namespace);
629 kfree(objp: args->server_path);
630 kfree(objp: args->fscache_uniq);
631 kfree(objp: args->mon_addr);
632 fscrypt_free_dummy_policy(dummy_policy: &args->dummy_enc_policy);
633 kfree(objp: args);
634}
635
636static int strcmp_null(const char *s1, const char *s2)
637{
638 if (!s1 && !s2)
639 return 0;
640 if (s1 && !s2)
641 return -1;
642 if (!s1 && s2)
643 return 1;
644 return strcmp(s1, s2);
645}
646
647static int compare_mount_options(struct ceph_mount_options *new_fsopt,
648 struct ceph_options *new_opt,
649 struct ceph_fs_client *fsc)
650{
651 struct ceph_mount_options *fsopt1 = new_fsopt;
652 struct ceph_mount_options *fsopt2 = fsc->mount_options;
653 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
654 int ret;
655
656 ret = memcmp(p: fsopt1, q: fsopt2, size: ofs);
657 if (ret)
658 return ret;
659
660 ret = strcmp_null(s1: fsopt1->snapdir_name, s2: fsopt2->snapdir_name);
661 if (ret)
662 return ret;
663
664 ret = strcmp_null(s1: fsopt1->mds_namespace, s2: fsopt2->mds_namespace);
665 if (ret)
666 return ret;
667
668 ret = strcmp_null(s1: fsopt1->server_path, s2: fsopt2->server_path);
669 if (ret)
670 return ret;
671
672 ret = strcmp_null(s1: fsopt1->fscache_uniq, s2: fsopt2->fscache_uniq);
673 if (ret)
674 return ret;
675
676 ret = strcmp_null(s1: fsopt1->mon_addr, s2: fsopt2->mon_addr);
677 if (ret)
678 return ret;
679
680 return ceph_compare_options(new_opt, client: fsc->client);
681}
682
683/**
684 * ceph_show_options - Show mount options in /proc/mounts
685 * @m: seq_file to write to
686 * @root: root of that (sub)tree
687 */
688static int ceph_show_options(struct seq_file *m, struct dentry *root)
689{
690 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb: root->d_sb);
691 struct ceph_mount_options *fsopt = fsc->mount_options;
692 size_t pos;
693 int ret;
694
695 /* a comma between MNT/MS and client options */
696 seq_putc(m, c: ',');
697 pos = m->count;
698
699 ret = ceph_print_client_options(m, client: fsc->client, show_all: false);
700 if (ret)
701 return ret;
702
703 /* retract our comma if no client options */
704 if (m->count == pos)
705 m->count--;
706
707 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
708 seq_puts(m, s: ",dirstat");
709 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
710 seq_puts(m, s: ",rbytes");
711 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
712 seq_puts(m, s: ",noasyncreaddir");
713 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
714 seq_puts(m, s: ",nodcache");
715 if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
716 seq_puts(m, s: ",ino32");
717 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
718 seq_show_option(m, name: "fsc", value: fsopt->fscache_uniq);
719 }
720 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
721 seq_puts(m, s: ",nopoolperm");
722 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
723 seq_puts(m, s: ",noquotadf");
724
725#ifdef CONFIG_CEPH_FS_POSIX_ACL
726 if (root->d_sb->s_flags & SB_POSIXACL)
727 seq_puts(m, s: ",acl");
728 else
729 seq_puts(m, s: ",noacl");
730#endif
731
732 if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
733 seq_puts(m, s: ",copyfrom");
734
735 /* dump mds_namespace when old device syntax is in use */
736 if (fsopt->mds_namespace && !fsopt->new_dev_syntax)
737 seq_show_option(m, name: "mds_namespace", value: fsopt->mds_namespace);
738
739 if (fsopt->mon_addr)
740 seq_printf(m, fmt: ",mon_addr=%s", fsopt->mon_addr);
741
742 if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
743 seq_show_option(m, name: "recover_session", value: "clean");
744
745 if (!(fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS))
746 seq_puts(m, s: ",wsync");
747 if (fsopt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
748 seq_puts(m, s: ",nopagecache");
749 if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
750 seq_puts(m, s: ",sparseread");
751
752 fscrypt_show_test_dummy_encryption(seq: m, sep: ',', sb: root->d_sb);
753
754 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
755 seq_printf(m, fmt: ",wsize=%u", fsopt->wsize);
756 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
757 seq_printf(m, fmt: ",rsize=%u", fsopt->rsize);
758 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
759 seq_printf(m, fmt: ",rasize=%u", fsopt->rasize);
760 if (fsopt->congestion_kb != default_congestion_kb())
761 seq_printf(m, fmt: ",write_congestion_kb=%u", fsopt->congestion_kb);
762 if (fsopt->caps_max)
763 seq_printf(m, fmt: ",caps_max=%d", fsopt->caps_max);
764 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
765 seq_printf(m, fmt: ",caps_wanted_delay_min=%u",
766 fsopt->caps_wanted_delay_min);
767 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
768 seq_printf(m, fmt: ",caps_wanted_delay_max=%u",
769 fsopt->caps_wanted_delay_max);
770 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
771 seq_printf(m, fmt: ",readdir_max_entries=%u", fsopt->max_readdir);
772 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
773 seq_printf(m, fmt: ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
774 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
775 seq_show_option(m, name: "snapdirname", value: fsopt->snapdir_name);
776
777 return 0;
778}
779
780/*
781 * handle any mon messages the standard library doesn't understand.
782 * return error if we don't either.
783 */
784static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
785{
786 struct ceph_fs_client *fsc = client->private;
787 int type = le16_to_cpu(msg->hdr.type);
788
789 switch (type) {
790 case CEPH_MSG_MDS_MAP:
791 ceph_mdsc_handle_mdsmap(mdsc: fsc->mdsc, msg);
792 return 0;
793 case CEPH_MSG_FS_MAP_USER:
794 ceph_mdsc_handle_fsmap(mdsc: fsc->mdsc, msg);
795 return 0;
796 default:
797 return -1;
798 }
799}
800
801/*
802 * create a new fs client
803 *
804 * Success or not, this function consumes @fsopt and @opt.
805 */
806static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
807 struct ceph_options *opt)
808{
809 struct ceph_fs_client *fsc;
810 int err;
811
812 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
813 if (!fsc) {
814 err = -ENOMEM;
815 goto fail;
816 }
817
818 fsc->client = ceph_create_client(opt, private: fsc);
819 if (IS_ERR(ptr: fsc->client)) {
820 err = PTR_ERR(ptr: fsc->client);
821 goto fail;
822 }
823 opt = NULL; /* fsc->client now owns this */
824
825 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
826 ceph_set_opt(fsc->client, ABORT_ON_FULL);
827
828 if (!fsopt->mds_namespace) {
829 ceph_monc_want_map(monc: &fsc->client->monc, sub: CEPH_SUB_MDSMAP,
830 epoch: 0, continuous: true);
831 } else {
832 ceph_monc_want_map(monc: &fsc->client->monc, sub: CEPH_SUB_FSMAP,
833 epoch: 0, continuous: false);
834 }
835
836 fsc->mount_options = fsopt;
837
838 fsc->sb = NULL;
839 fsc->mount_state = CEPH_MOUNT_MOUNTING;
840 fsc->filp_gen = 1;
841 fsc->have_copy_from2 = true;
842
843 atomic_long_set(v: &fsc->writeback_count, i: 0);
844 fsc->write_congested = false;
845
846 err = -ENOMEM;
847 /*
848 * The number of concurrent works can be high but they don't need
849 * to be processed in parallel, limit concurrency.
850 */
851 fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
852 if (!fsc->inode_wq)
853 goto fail_client;
854 fsc->cap_wq = alloc_workqueue("ceph-cap", WQ_PERCPU, 1);
855 if (!fsc->cap_wq)
856 goto fail_inode_wq;
857
858 hash_init(fsc->async_unlink_conflict);
859 spin_lock_init(&fsc->async_unlink_conflict_lock);
860
861 spin_lock(lock: &ceph_fsc_lock);
862 list_add_tail(new: &fsc->metric_wakeup, head: &ceph_fsc_list);
863 spin_unlock(lock: &ceph_fsc_lock);
864
865 return fsc;
866
867fail_inode_wq:
868 destroy_workqueue(wq: fsc->inode_wq);
869fail_client:
870 ceph_destroy_client(client: fsc->client);
871fail:
872 kfree(objp: fsc);
873 if (opt)
874 ceph_destroy_options(opt);
875 destroy_mount_options(args: fsopt);
876 return ERR_PTR(error: err);
877}
878
879static void flush_fs_workqueues(struct ceph_fs_client *fsc)
880{
881 flush_workqueue(fsc->inode_wq);
882 flush_workqueue(fsc->cap_wq);
883}
884
885static void destroy_fs_client(struct ceph_fs_client *fsc)
886{
887 doutc(fsc->client, "%p\n", fsc);
888
889 spin_lock(lock: &ceph_fsc_lock);
890 list_del(entry: &fsc->metric_wakeup);
891 spin_unlock(lock: &ceph_fsc_lock);
892
893 ceph_mdsc_destroy(fsc);
894 destroy_workqueue(wq: fsc->inode_wq);
895 destroy_workqueue(wq: fsc->cap_wq);
896
897 destroy_mount_options(args: fsc->mount_options);
898
899 ceph_destroy_client(client: fsc->client);
900
901 kfree(objp: fsc);
902 dout("%s: %p done\n", __func__, fsc);
903}
904
905/*
906 * caches
907 */
908struct kmem_cache *ceph_inode_cachep;
909struct kmem_cache *ceph_cap_cachep;
910struct kmem_cache *ceph_cap_snap_cachep;
911struct kmem_cache *ceph_cap_flush_cachep;
912struct kmem_cache *ceph_dentry_cachep;
913struct kmem_cache *ceph_file_cachep;
914struct kmem_cache *ceph_dir_file_cachep;
915struct kmem_cache *ceph_mds_request_cachep;
916mempool_t *ceph_wb_pagevec_pool;
917
918static void ceph_inode_init_once(void *foo)
919{
920 struct ceph_inode_info *ci = foo;
921 inode_init_once(&ci->netfs.inode);
922}
923
924static int __init init_caches(void)
925{
926 int error = -ENOMEM;
927
928 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
929 sizeof(struct ceph_inode_info),
930 __alignof__(struct ceph_inode_info),
931 SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
932 ceph_inode_init_once);
933 if (!ceph_inode_cachep)
934 return -ENOMEM;
935
936 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 0);
937 if (!ceph_cap_cachep)
938 goto bad_cap;
939 ceph_cap_snap_cachep = KMEM_CACHE(ceph_cap_snap, 0);
940 if (!ceph_cap_snap_cachep)
941 goto bad_cap_snap;
942 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
943 SLAB_RECLAIM_ACCOUNT);
944 if (!ceph_cap_flush_cachep)
945 goto bad_cap_flush;
946
947 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
948 SLAB_RECLAIM_ACCOUNT);
949 if (!ceph_dentry_cachep)
950 goto bad_dentry;
951
952 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 0);
953 if (!ceph_file_cachep)
954 goto bad_file;
955
956 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, 0);
957 if (!ceph_dir_file_cachep)
958 goto bad_dir_file;
959
960 ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, 0);
961 if (!ceph_mds_request_cachep)
962 goto bad_mds_req;
963
964 ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(10,
965 (CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT) * sizeof(struct page *));
966 if (!ceph_wb_pagevec_pool)
967 goto bad_pagevec_pool;
968
969 return 0;
970
971bad_pagevec_pool:
972 kmem_cache_destroy(s: ceph_mds_request_cachep);
973bad_mds_req:
974 kmem_cache_destroy(s: ceph_dir_file_cachep);
975bad_dir_file:
976 kmem_cache_destroy(s: ceph_file_cachep);
977bad_file:
978 kmem_cache_destroy(s: ceph_dentry_cachep);
979bad_dentry:
980 kmem_cache_destroy(s: ceph_cap_flush_cachep);
981bad_cap_flush:
982 kmem_cache_destroy(s: ceph_cap_snap_cachep);
983bad_cap_snap:
984 kmem_cache_destroy(s: ceph_cap_cachep);
985bad_cap:
986 kmem_cache_destroy(s: ceph_inode_cachep);
987 return error;
988}
989
990static void destroy_caches(void)
991{
992 /*
993 * Make sure all delayed rcu free inodes are flushed before we
994 * destroy cache.
995 */
996 rcu_barrier();
997
998 kmem_cache_destroy(s: ceph_inode_cachep);
999 kmem_cache_destroy(s: ceph_cap_cachep);
1000 kmem_cache_destroy(s: ceph_cap_snap_cachep);
1001 kmem_cache_destroy(s: ceph_cap_flush_cachep);
1002 kmem_cache_destroy(s: ceph_dentry_cachep);
1003 kmem_cache_destroy(s: ceph_file_cachep);
1004 kmem_cache_destroy(s: ceph_dir_file_cachep);
1005 kmem_cache_destroy(s: ceph_mds_request_cachep);
1006 mempool_destroy(pool: ceph_wb_pagevec_pool);
1007}
1008
1009static void __ceph_umount_begin(struct ceph_fs_client *fsc)
1010{
1011 ceph_osdc_abort_requests(osdc: &fsc->client->osdc, err: -EIO);
1012 ceph_mdsc_force_umount(mdsc: fsc->mdsc);
1013 fsc->filp_gen++; // invalidate open files
1014}
1015
1016/*
1017 * ceph_umount_begin - initiate forced umount. Tear down the
1018 * mount, skipping steps that may hang while waiting for server(s).
1019 */
1020void ceph_umount_begin(struct super_block *sb)
1021{
1022 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1023
1024 doutc(fsc->client, "starting forced umount\n");
1025
1026 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
1027 __ceph_umount_begin(fsc);
1028}
1029
1030static const struct super_operations ceph_super_ops = {
1031 .alloc_inode = ceph_alloc_inode,
1032 .free_inode = ceph_free_inode,
1033 .write_inode = ceph_write_inode,
1034 .drop_inode = inode_just_drop,
1035 .evict_inode = ceph_evict_inode,
1036 .sync_fs = ceph_sync_fs,
1037 .put_super = ceph_put_super,
1038 .show_options = ceph_show_options,
1039 .statfs = ceph_statfs,
1040 .umount_begin = ceph_umount_begin,
1041};
1042
1043/*
1044 * Bootstrap mount by opening the root directory. Note the mount
1045 * @started time from caller, and time out if this takes too long.
1046 */
1047static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
1048 const char *path,
1049 unsigned long started)
1050{
1051 struct ceph_client *cl = fsc->client;
1052 struct ceph_mds_client *mdsc = fsc->mdsc;
1053 struct ceph_mds_request *req = NULL;
1054 int err;
1055 struct dentry *root;
1056
1057 /* open dir */
1058 doutc(cl, "opening '%s'\n", path);
1059 req = ceph_mdsc_create_request(mdsc, op: CEPH_MDS_OP_GETATTR, mode: USE_ANY_MDS);
1060 if (IS_ERR(ptr: req))
1061 return ERR_CAST(ptr: req);
1062 req->r_path1 = kstrdup(s: path, GFP_NOFS);
1063 if (!req->r_path1) {
1064 root = ERR_PTR(error: -ENOMEM);
1065 goto out;
1066 }
1067
1068 req->r_ino1.ino = CEPH_INO_ROOT;
1069 req->r_ino1.snap = CEPH_NOSNAP;
1070 req->r_started = started;
1071 req->r_timeout = fsc->client->options->mount_timeout;
1072 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
1073 req->r_num_caps = 2;
1074 err = ceph_mdsc_do_request(mdsc, NULL, req);
1075 if (err == 0) {
1076 struct inode *inode = req->r_target_inode;
1077 req->r_target_inode = NULL;
1078 doutc(cl, "success\n");
1079 root = d_make_root(inode);
1080 if (!root) {
1081 root = ERR_PTR(error: -ENOMEM);
1082 goto out;
1083 }
1084 doutc(cl, "success, root dentry is %p\n", root);
1085 } else {
1086 root = ERR_PTR(error: err);
1087 }
1088out:
1089 ceph_mdsc_put_request(req);
1090 return root;
1091}
1092
1093#ifdef CONFIG_FS_ENCRYPTION
1094static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1095 struct fs_context *fc,
1096 struct ceph_mount_options *fsopt)
1097{
1098 struct ceph_fs_client *fsc = sb->s_fs_info;
1099
1100 if (!fscrypt_is_dummy_policy_set(dummy_policy: &fsopt->dummy_enc_policy))
1101 return 0;
1102
1103 /* No changing encryption context on remount. */
1104 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE &&
1105 !fscrypt_is_dummy_policy_set(dummy_policy: &fsc->fsc_dummy_enc_policy)) {
1106 if (fscrypt_dummy_policies_equal(p1: &fsopt->dummy_enc_policy,
1107 p2: &fsc->fsc_dummy_enc_policy))
1108 return 0;
1109 errorfc(fc, "Can't set test_dummy_encryption on remount");
1110 return -EINVAL;
1111 }
1112
1113 /* Also make sure fsopt doesn't contain a conflicting value. */
1114 if (fscrypt_is_dummy_policy_set(dummy_policy: &fsc->fsc_dummy_enc_policy)) {
1115 if (fscrypt_dummy_policies_equal(p1: &fsopt->dummy_enc_policy,
1116 p2: &fsc->fsc_dummy_enc_policy))
1117 return 0;
1118 errorfc(fc, "Conflicting test_dummy_encryption options");
1119 return -EINVAL;
1120 }
1121
1122 fsc->fsc_dummy_enc_policy = fsopt->dummy_enc_policy;
1123 memset(&fsopt->dummy_enc_policy, 0, sizeof(fsopt->dummy_enc_policy));
1124
1125 warnfc(fc, "test_dummy_encryption mode enabled");
1126 return 0;
1127}
1128#else
1129static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1130 struct fs_context *fc,
1131 struct ceph_mount_options *fsopt)
1132{
1133 return 0;
1134}
1135#endif
1136
1137/*
1138 * mount: join the ceph cluster, and open root directory.
1139 */
1140static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
1141 struct fs_context *fc)
1142{
1143 struct ceph_client *cl = fsc->client;
1144 int err;
1145 unsigned long started = jiffies; /* note the start time */
1146 struct dentry *root;
1147
1148 doutc(cl, "mount start %p\n", fsc);
1149 mutex_lock(&fsc->client->mount_mutex);
1150
1151 if (!fsc->sb->s_root) {
1152 const char *path = fsc->mount_options->server_path ?
1153 fsc->mount_options->server_path + 1 : "";
1154
1155 err = __ceph_open_session(client: fsc->client);
1156 if (err < 0)
1157 goto out;
1158
1159 /* setup fscache */
1160 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
1161 err = ceph_fscache_register_fs(fsc, fc);
1162 if (err < 0)
1163 goto out;
1164 }
1165
1166 err = ceph_apply_test_dummy_encryption(sb: fsc->sb, fc,
1167 fsopt: fsc->mount_options);
1168 if (err)
1169 goto out;
1170
1171 doutc(cl, "mount opening path '%s'\n", path);
1172
1173 ceph_fs_debugfs_init(client: fsc);
1174
1175 root = open_root_dentry(fsc, path, started);
1176 if (IS_ERR(ptr: root)) {
1177 err = PTR_ERR(ptr: root);
1178 goto out;
1179 }
1180 fsc->sb->s_root = dget(dentry: root);
1181 } else {
1182 root = dget(dentry: fsc->sb->s_root);
1183 }
1184
1185 fsc->mount_state = CEPH_MOUNT_MOUNTED;
1186 doutc(cl, "mount success\n");
1187 mutex_unlock(lock: &fsc->client->mount_mutex);
1188 return root;
1189
1190out:
1191 mutex_unlock(lock: &fsc->client->mount_mutex);
1192 ceph_fscrypt_free_dummy_policy(fsc);
1193 return ERR_PTR(error: err);
1194}
1195
1196static int ceph_set_super(struct super_block *s, struct fs_context *fc)
1197{
1198 struct ceph_fs_client *fsc = s->s_fs_info;
1199 struct ceph_client *cl = fsc->client;
1200 int ret;
1201
1202 doutc(cl, "%p\n", s);
1203
1204 s->s_maxbytes = MAX_LFS_FILESIZE;
1205
1206 s->s_xattr = ceph_xattr_handlers;
1207 fsc->sb = s;
1208 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
1209
1210 s->s_op = &ceph_super_ops;
1211 set_default_d_op(s, &ceph_dentry_ops);
1212 s->s_export_op = &ceph_export_ops;
1213
1214 s->s_time_gran = 1;
1215 s->s_time_min = 0;
1216 s->s_time_max = U32_MAX;
1217 s->s_flags |= SB_NODIRATIME | SB_NOATIME;
1218 s->s_magic = CEPH_SUPER_MAGIC;
1219
1220 ceph_fscrypt_set_ops(sb: s);
1221
1222 ret = set_anon_super_fc(s, fc);
1223 if (ret != 0)
1224 fsc->sb = NULL;
1225 return ret;
1226}
1227
1228/*
1229 * share superblock if same fs AND options
1230 */
1231static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
1232{
1233 struct ceph_fs_client *new = fc->s_fs_info;
1234 struct ceph_mount_options *fsopt = new->mount_options;
1235 struct ceph_options *opt = new->client->options;
1236 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1237 struct ceph_client *cl = fsc->client;
1238
1239 doutc(cl, "%p\n", sb);
1240
1241 if (compare_mount_options(new_fsopt: fsopt, new_opt: opt, fsc)) {
1242 doutc(cl, "monitor(s)/mount options don't match\n");
1243 return 0;
1244 }
1245 if ((opt->flags & CEPH_OPT_FSID) &&
1246 ceph_fsid_compare(a: &opt->fsid, b: &fsc->client->fsid)) {
1247 doutc(cl, "fsid doesn't match\n");
1248 return 0;
1249 }
1250 if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
1251 doutc(cl, "flags differ\n");
1252 return 0;
1253 }
1254
1255 if (fsc->blocklisted && !ceph_test_mount_opt(fsc, CLEANRECOVER)) {
1256 doutc(cl, "client is blocklisted (and CLEANRECOVER is not set)\n");
1257 return 0;
1258 }
1259
1260 if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) {
1261 doutc(cl, "client has been forcibly unmounted\n");
1262 return 0;
1263 }
1264
1265 return 1;
1266}
1267
1268/*
1269 * construct our own bdi so we can control readahead, etc.
1270 */
1271static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1272
1273static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1274{
1275 int err;
1276
1277 err = super_setup_bdi_name(sb, fmt: "ceph-%ld",
1278 atomic_long_inc_return(v: &bdi_seq));
1279 if (err)
1280 return err;
1281
1282 /* set ra_pages based on rasize mount option? */
1283 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1284
1285 /* set io_pages based on max osd read size */
1286 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1287
1288 return 0;
1289}
1290
1291static int ceph_get_tree(struct fs_context *fc)
1292{
1293 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1294 struct ceph_mount_options *fsopt = pctx->opts;
1295 struct super_block *sb;
1296 struct ceph_fs_client *fsc;
1297 struct dentry *res;
1298 int (*compare_super)(struct super_block *, struct fs_context *) =
1299 ceph_compare_super;
1300 int err;
1301
1302 dout("ceph_get_tree\n");
1303
1304 if (!fc->source)
1305 return invalfc(fc, "No source");
1306 if (fsopt->new_dev_syntax && !fsopt->mon_addr)
1307 return invalfc(fc, "No monitor address");
1308
1309 /* create client (which we may/may not use) */
1310 fsc = create_fs_client(fsopt: pctx->opts, opt: pctx->copts);
1311 pctx->opts = NULL;
1312 pctx->copts = NULL;
1313 if (IS_ERR(ptr: fsc)) {
1314 err = PTR_ERR(ptr: fsc);
1315 goto out_final;
1316 }
1317
1318 err = ceph_mdsc_init(fsc);
1319 if (err < 0)
1320 goto out;
1321
1322 if (ceph_test_opt(fsc->client, NOSHARE))
1323 compare_super = NULL;
1324
1325 fc->s_fs_info = fsc;
1326 sb = sget_fc(fc, test: compare_super, set: ceph_set_super);
1327 fc->s_fs_info = NULL;
1328 if (IS_ERR(ptr: sb)) {
1329 err = PTR_ERR(ptr: sb);
1330 goto out;
1331 }
1332
1333 if (ceph_sb_to_fs_client(sb) != fsc) {
1334 destroy_fs_client(fsc);
1335 fsc = ceph_sb_to_fs_client(sb);
1336 dout("get_sb got existing client %p\n", fsc);
1337 } else {
1338 dout("get_sb using new client %p\n", fsc);
1339 err = ceph_setup_bdi(sb, fsc);
1340 if (err < 0)
1341 goto out_splat;
1342 }
1343
1344 res = ceph_real_mount(fsc, fc);
1345 if (IS_ERR(ptr: res)) {
1346 err = PTR_ERR(ptr: res);
1347 goto out_splat;
1348 }
1349
1350 doutc(fsc->client, "root %p inode %p ino %llx.%llx\n", res,
1351 d_inode(res), ceph_vinop(d_inode(res)));
1352 fc->root = fsc->sb->s_root;
1353 return 0;
1354
1355out_splat:
1356 if (!ceph_mdsmap_is_cluster_available(m: fsc->mdsc->mdsmap)) {
1357 pr_info("No mds server is up or the cluster is laggy\n");
1358 err = -EHOSTUNREACH;
1359 }
1360
1361 ceph_mdsc_close_sessions(mdsc: fsc->mdsc);
1362 deactivate_locked_super(sb);
1363 goto out_final;
1364
1365out:
1366 destroy_fs_client(fsc);
1367out_final:
1368 dout("ceph_get_tree fail %d\n", err);
1369 return err;
1370}
1371
1372static void ceph_free_fc(struct fs_context *fc)
1373{
1374 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1375
1376 if (pctx) {
1377 destroy_mount_options(args: pctx->opts);
1378 ceph_destroy_options(opt: pctx->copts);
1379 kfree(objp: pctx);
1380 }
1381}
1382
1383static int ceph_reconfigure_fc(struct fs_context *fc)
1384{
1385 int err;
1386 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1387 struct ceph_mount_options *fsopt = pctx->opts;
1388 struct super_block *sb = fc->root->d_sb;
1389 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1390
1391 err = ceph_apply_test_dummy_encryption(sb, fc, fsopt);
1392 if (err)
1393 return err;
1394
1395 if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1396 ceph_set_mount_opt(fsc, ASYNC_DIROPS);
1397 else
1398 ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
1399
1400 if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
1401 ceph_set_mount_opt(fsc, SPARSEREAD);
1402 else
1403 ceph_clear_mount_opt(fsc, SPARSEREAD);
1404
1405 if (strcmp_null(s1: fsc->mount_options->mon_addr, s2: fsopt->mon_addr)) {
1406 kfree(objp: fsc->mount_options->mon_addr);
1407 fsc->mount_options->mon_addr = fsopt->mon_addr;
1408 fsopt->mon_addr = NULL;
1409 pr_notice_client(fsc->client,
1410 "monitor addresses recorded, but not used for reconnection");
1411 }
1412
1413 sync_filesystem(sb);
1414 return 0;
1415}
1416
1417static const struct fs_context_operations ceph_context_ops = {
1418 .free = ceph_free_fc,
1419 .parse_param = ceph_parse_mount_param,
1420 .get_tree = ceph_get_tree,
1421 .reconfigure = ceph_reconfigure_fc,
1422};
1423
1424/*
1425 * Set up the filesystem mount context.
1426 */
1427static int ceph_init_fs_context(struct fs_context *fc)
1428{
1429 struct ceph_parse_opts_ctx *pctx;
1430 struct ceph_mount_options *fsopt;
1431
1432 pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1433 if (!pctx)
1434 return -ENOMEM;
1435
1436 pctx->copts = ceph_alloc_options();
1437 if (!pctx->copts)
1438 goto nomem;
1439
1440 pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1441 if (!pctx->opts)
1442 goto nomem;
1443
1444 fsopt = pctx->opts;
1445 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1446
1447 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1448 fsopt->rsize = CEPH_MAX_READ_SIZE;
1449 fsopt->rasize = CEPH_RASIZE_DEFAULT;
1450 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1451 if (!fsopt->snapdir_name)
1452 goto nomem;
1453
1454 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1455 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1456 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1457 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1458 fsopt->congestion_kb = default_congestion_kb();
1459
1460#ifdef CONFIG_CEPH_FS_POSIX_ACL
1461 fc->sb_flags |= SB_POSIXACL;
1462#endif
1463
1464 fc->fs_private = pctx;
1465 fc->ops = &ceph_context_ops;
1466 return 0;
1467
1468nomem:
1469 destroy_mount_options(args: pctx->opts);
1470 ceph_destroy_options(opt: pctx->copts);
1471 kfree(objp: pctx);
1472 return -ENOMEM;
1473}
1474
1475/*
1476 * Return true if it successfully increases the blocker counter,
1477 * or false if the mdsc is in stopping and flushed state.
1478 */
1479static bool __inc_stopping_blocker(struct ceph_mds_client *mdsc)
1480{
1481 spin_lock(lock: &mdsc->stopping_lock);
1482 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING) {
1483 spin_unlock(lock: &mdsc->stopping_lock);
1484 return false;
1485 }
1486 atomic_inc(v: &mdsc->stopping_blockers);
1487 spin_unlock(lock: &mdsc->stopping_lock);
1488 return true;
1489}
1490
1491static void __dec_stopping_blocker(struct ceph_mds_client *mdsc)
1492{
1493 spin_lock(lock: &mdsc->stopping_lock);
1494 if (!atomic_dec_return(v: &mdsc->stopping_blockers) &&
1495 mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING)
1496 complete_all(&mdsc->stopping_waiter);
1497 spin_unlock(lock: &mdsc->stopping_lock);
1498}
1499
1500/* For metadata IO requests */
1501bool ceph_inc_mds_stopping_blocker(struct ceph_mds_client *mdsc,
1502 struct ceph_mds_session *session)
1503{
1504 mutex_lock(&session->s_mutex);
1505 inc_session_sequence(s: session);
1506 mutex_unlock(lock: &session->s_mutex);
1507
1508 return __inc_stopping_blocker(mdsc);
1509}
1510
1511void ceph_dec_mds_stopping_blocker(struct ceph_mds_client *mdsc)
1512{
1513 __dec_stopping_blocker(mdsc);
1514}
1515
1516/* For data IO requests */
1517bool ceph_inc_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1518{
1519 return __inc_stopping_blocker(mdsc);
1520}
1521
1522void ceph_dec_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1523{
1524 __dec_stopping_blocker(mdsc);
1525}
1526
1527static void ceph_kill_sb(struct super_block *s)
1528{
1529 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb: s);
1530 struct ceph_client *cl = fsc->client;
1531 struct ceph_mds_client *mdsc = fsc->mdsc;
1532 bool wait;
1533
1534 doutc(cl, "%p\n", s);
1535
1536 ceph_mdsc_pre_umount(mdsc);
1537 flush_fs_workqueues(fsc);
1538
1539 /*
1540 * Though the kill_anon_super() will finally trigger the
1541 * sync_filesystem() anyway, we still need to do it here and
1542 * then bump the stage of shutdown. This will allow us to
1543 * drop any further message, which will increase the inodes'
1544 * i_count reference counters but makes no sense any more,
1545 * from MDSs.
1546 *
1547 * Without this when evicting the inodes it may fail in the
1548 * kill_anon_super(), which will trigger a warning when
1549 * destroying the fscrypt keyring and then possibly trigger
1550 * a further crash in ceph module when the iput() tries to
1551 * evict the inodes later.
1552 */
1553 sync_filesystem(s);
1554
1555 if (atomic64_read(v: &mdsc->dirty_folios) > 0) {
1556 wait_queue_head_t *wq = &mdsc->flush_end_wq;
1557 long timeleft = wait_event_killable_timeout(*wq,
1558 atomic64_read(&mdsc->dirty_folios) <= 0,
1559 fsc->client->options->mount_timeout);
1560 if (!timeleft) /* timed out */
1561 pr_warn_client(cl, "umount timed out, %ld\n", timeleft);
1562 else if (timeleft < 0) /* killed */
1563 pr_warn_client(cl, "umount was killed, %ld\n", timeleft);
1564 }
1565
1566 spin_lock(lock: &mdsc->stopping_lock);
1567 mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHING;
1568 wait = !!atomic_read(v: &mdsc->stopping_blockers);
1569 spin_unlock(lock: &mdsc->stopping_lock);
1570
1571 if (wait && atomic_read(v: &mdsc->stopping_blockers)) {
1572 long timeleft = wait_for_completion_killable_timeout(
1573 x: &mdsc->stopping_waiter,
1574 timeout: 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(sb: s);
1583
1584 fsc->client->extra_mon_dispatch = NULL;
1585 ceph_fs_debugfs_cleanup(client: fsc);
1586
1587 ceph_fscache_unregister_fs(fsc);
1588
1589 destroy_fs_client(fsc);
1590}
1591
1592static 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};
1599MODULE_ALIAS_FS("ceph");
1600
1601int 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(client: fsc->client);
1616
1617 ceph_osdc_clear_abort_err(osdc: &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(inode: d_inode(dentry: sb->s_root), NULL,
1624 CEPH_STAT_CAP_INODE, force: true);
1625 }
1626 return err;
1627}
1628
1629static 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
1644out_caches:
1645 destroy_caches();
1646out:
1647 return ret;
1648}
1649
1650static void __exit exit_ceph(void)
1651{
1652 dout("exit_ceph\n");
1653 unregister_filesystem(&ceph_fs_type);
1654 destroy_caches();
1655}
1656
1657static 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(lock: &ceph_fsc_lock);
1670 list_for_each_entry(fsc, &ceph_fsc_list, metric_wakeup) {
1671 metric_schedule_delayed(m: &fsc->mdsc->metric);
1672 }
1673 spin_unlock(lock: &ceph_fsc_lock);
1674 }
1675
1676 return 0;
1677}
1678
1679static const struct kernel_param_ops param_ops_metrics = {
1680 .set = param_set_metrics,
1681 .get = param_get_bool,
1682};
1683
1684bool disable_send_metrics = false;
1685module_param_cb(disable_send_metrics, &param_ops_metrics, &disable_send_metrics, 0644);
1686MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
1687
1688/* for both v1 and v2 syntax */
1689static bool mount_support = true;
1690static const struct kernel_param_ops param_ops_mount_syntax = {
1691 .get = param_get_bool,
1692};
1693module_param_cb(mount_syntax_v1, &param_ops_mount_syntax, &mount_support, 0444);
1694module_param_cb(mount_syntax_v2, &param_ops_mount_syntax, &mount_support, 0444);
1695
1696bool enable_unsafe_idmap = false;
1697module_param(enable_unsafe_idmap, bool, 0644);
1698MODULE_PARM_DESC(enable_unsafe_idmap,
1699 "Allow to use idmapped mounts with MDS without CEPHFS_FEATURE_HAS_OWNER_UIDGID");
1700
1701module_init(init_ceph);
1702module_exit(exit_ceph);
1703
1704MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1705MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1706MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1707MODULE_DESCRIPTION("Ceph filesystem for Linux");
1708MODULE_LICENSE("GPL");
1709

source code of linux/fs/ceph/super.c