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