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spi: efm32: Convert to use GPIO descriptors
[linux/fpc-iii.git] / fs / ceph / super.c
blobc7f150686a53d41295f0e6a1b718d81e7a587344
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 /*
31 * Ceph superblock operations
32 *
33 * Handle the basics of mounting, unmounting.
34 */
35
36 /*
37 * super ops
38 */
39 static void ceph_put_super(struct super_block *s)
40 {
41 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
42
43 dout("put_super\n");
44 ceph_mdsc_close_sessions(fsc->mdsc);
45 }
46
47 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
48 {
49 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
50 struct ceph_mon_client *monc = &fsc->client->monc;
51 struct ceph_statfs st;
52 u64 fsid;
53 int err;
54 u64 data_pool;
55
56 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
57 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
58 } else {
59 data_pool = CEPH_NOPOOL;
60 }
61
62 dout("statfs\n");
63 err = ceph_monc_do_statfs(monc, data_pool, &st);
64 if (err < 0)
65 return err;
66
67 /* fill in kstatfs */
68 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
69
70 /*
71 * express utilization in terms of large blocks to avoid
72 * overflow on 32-bit machines.
73 *
74 * NOTE: for the time being, we make bsize == frsize to humor
75 * not-yet-ancient versions of glibc that are broken.
76 * Someday, we will probably want to report a real block
77 * size... whatever that may mean for a network file system!
78 */
79 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
80 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
81
82 /*
83 * By default use root quota for stats; fallback to overall filesystem
84 * usage if using 'noquotadf' mount option or if the root dir doesn't
85 * have max_bytes quota set.
86 */
87 if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
88 !ceph_quota_update_statfs(fsc, buf)) {
89 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
90 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
91 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
92 }
93
94 buf->f_files = le64_to_cpu(st.num_objects);
95 buf->f_ffree = -1;
96 buf->f_namelen = NAME_MAX;
97
98 /* Must convert the fsid, for consistent values across arches */
99 mutex_lock(&monc->mutex);
100 fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
101 le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
102 mutex_unlock(&monc->mutex);
103
104 buf->f_fsid.val[0] = fsid & 0xffffffff;
105 buf->f_fsid.val[1] = fsid >> 32;
106
107 return 0;
108 }
109
110 static int ceph_sync_fs(struct super_block *sb, int wait)
111 {
112 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
113
114 if (!wait) {
115 dout("sync_fs (non-blocking)\n");
116 ceph_flush_dirty_caps(fsc->mdsc);
117 dout("sync_fs (non-blocking) done\n");
118 return 0;
119 }
120
121 dout("sync_fs (blocking)\n");
122 ceph_osdc_sync(&fsc->client->osdc);
123 ceph_mdsc_sync(fsc->mdsc);
124 dout("sync_fs (blocking) done\n");
125 return 0;
126 }
127
128 /*
129 * mount options
130 */
131 enum {
132 Opt_wsize,
133 Opt_rsize,
134 Opt_rasize,
135 Opt_caps_wanted_delay_min,
136 Opt_caps_wanted_delay_max,
137 Opt_caps_max,
138 Opt_readdir_max_entries,
139 Opt_readdir_max_bytes,
140 Opt_congestion_kb,
141 /* int args above */
142 Opt_snapdirname,
143 Opt_mds_namespace,
144 Opt_recover_session,
145 Opt_source,
146 /* string args above */
147 Opt_dirstat,
148 Opt_rbytes,
149 Opt_asyncreaddir,
150 Opt_dcache,
151 Opt_ino32,
152 Opt_fscache,
153 Opt_poolperm,
154 Opt_require_active_mds,
155 Opt_acl,
156 Opt_quotadf,
157 Opt_copyfrom,
158 };
159
160 enum ceph_recover_session_mode {
161 ceph_recover_session_no,
162 ceph_recover_session_clean
163 };
164
165 static const struct constant_table ceph_param_recover[] = {
166 { "no", ceph_recover_session_no },
167 { "clean", ceph_recover_session_clean },
168 {}
169 };
170
171 static const struct fs_parameter_spec ceph_mount_parameters[] = {
172 fsparam_flag_no ("acl", Opt_acl),
173 fsparam_flag_no ("asyncreaddir", Opt_asyncreaddir),
174 fsparam_s32 ("caps_max", Opt_caps_max),
175 fsparam_u32 ("caps_wanted_delay_max", Opt_caps_wanted_delay_max),
176 fsparam_u32 ("caps_wanted_delay_min", Opt_caps_wanted_delay_min),
177 fsparam_u32 ("write_congestion_kb", Opt_congestion_kb),
178 fsparam_flag_no ("copyfrom", Opt_copyfrom),
179 fsparam_flag_no ("dcache", Opt_dcache),
180 fsparam_flag_no ("dirstat", Opt_dirstat),
181 fsparam_flag_no ("fsc", Opt_fscache), // fsc|nofsc
182 fsparam_string ("fsc", Opt_fscache), // fsc=...
183 fsparam_flag_no ("ino32", Opt_ino32),
184 fsparam_string ("mds_namespace", Opt_mds_namespace),
185 fsparam_flag_no ("poolperm", Opt_poolperm),
186 fsparam_flag_no ("quotadf", Opt_quotadf),
187 fsparam_u32 ("rasize", Opt_rasize),
188 fsparam_flag_no ("rbytes", Opt_rbytes),
189 fsparam_u32 ("readdir_max_bytes", Opt_readdir_max_bytes),
190 fsparam_u32 ("readdir_max_entries", Opt_readdir_max_entries),
191 fsparam_enum ("recover_session", Opt_recover_session, ceph_param_recover),
192 fsparam_flag_no ("require_active_mds", Opt_require_active_mds),
193 fsparam_u32 ("rsize", Opt_rsize),
194 fsparam_string ("snapdirname", Opt_snapdirname),
195 fsparam_string ("source", Opt_source),
196 fsparam_u32 ("wsize", Opt_wsize),
197 {}
198 };
199
200 struct ceph_parse_opts_ctx {
201 struct ceph_options *copts;
202 struct ceph_mount_options *opts;
203 };
204
205 /*
206 * Remove adjacent slashes and then the trailing slash, unless it is
207 * the only remaining character.
208 *
209 * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
210 */
211 static void canonicalize_path(char *path)
212 {
213 int i, j = 0;
214
215 for (i = 0; path[i] != '\0'; i++) {
216 if (path[i] != '/' || j < 1 || path[j - 1] != '/')
217 path[j++] = path[i];
218 }
219
220 if (j > 1 && path[j - 1] == '/')
221 j--;
222 path[j] = '\0';
223 }
224
225 /*
226 * Parse the source parameter. Distinguish the server list from the path.
227 *
228 * The source will look like:
229 * <server_spec>[,<server_spec>...]:[<path>]
230 * where
231 * <server_spec> is <ip>[:<port>]
232 * <path> is optional, but if present must begin with '/'
233 */
234 static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
235 {
236 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
237 struct ceph_mount_options *fsopt = pctx->opts;
238 char *dev_name = param->string, *dev_name_end;
239 int ret;
240
241 dout("%s '%s'\n", __func__, dev_name);
242 if (!dev_name || !*dev_name)
243 return invalfc(fc, "Empty source");
244
245 dev_name_end = strchr(dev_name, '/');
246 if (dev_name_end) {
247 /*
248 * The server_path will include the whole chars from userland
249 * including the leading '/'.
250 */
251 kfree(fsopt->server_path);
252 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
253 if (!fsopt->server_path)
254 return -ENOMEM;
255
256 canonicalize_path(fsopt->server_path);
257 } else {
258 dev_name_end = dev_name + strlen(dev_name);
259 }
260
261 dev_name_end--; /* back up to ':' separator */
262 if (dev_name_end < dev_name || *dev_name_end != ':')
263 return invalfc(fc, "No path or : separator in source");
264
265 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
266 if (fsopt->server_path)
267 dout("server path '%s'\n", fsopt->server_path);
268
269 ret = ceph_parse_mon_ips(param->string, dev_name_end - dev_name,
270 pctx->copts, fc->log.log);
271 if (ret)
272 return ret;
273
274 fc->source = param->string;
275 param->string = NULL;
276 return 0;
277 }
278
279 static int ceph_parse_mount_param(struct fs_context *fc,
280 struct fs_parameter *param)
281 {
282 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
283 struct ceph_mount_options *fsopt = pctx->opts;
284 struct fs_parse_result result;
285 unsigned int mode;
286 int token, ret;
287
288 ret = ceph_parse_param(param, pctx->copts, fc->log.log);
289 if (ret != -ENOPARAM)
290 return ret;
291
292 token = fs_parse(fc, ceph_mount_parameters, param, &result);
293 dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
294 if (token < 0)
295 return token;
296
297 switch (token) {
298 case Opt_snapdirname:
299 kfree(fsopt->snapdir_name);
300 fsopt->snapdir_name = param->string;
301 param->string = NULL;
302 break;
303 case Opt_mds_namespace:
304 kfree(fsopt->mds_namespace);
305 fsopt->mds_namespace = param->string;
306 param->string = NULL;
307 break;
308 case Opt_recover_session:
309 mode = result.uint_32;
310 if (mode == ceph_recover_session_no)
311 fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
312 else if (mode == ceph_recover_session_clean)
313 fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
314 else
315 BUG();
316 break;
317 case Opt_source:
318 if (fc->source)
319 return invalfc(fc, "Multiple sources specified");
320 return ceph_parse_source(param, fc);
321 case Opt_wsize:
322 if (result.uint_32 < PAGE_SIZE ||
323 result.uint_32 > CEPH_MAX_WRITE_SIZE)
324 goto out_of_range;
325 fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
326 break;
327 case Opt_rsize:
328 if (result.uint_32 < PAGE_SIZE ||
329 result.uint_32 > CEPH_MAX_READ_SIZE)
330 goto out_of_range;
331 fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
332 break;
333 case Opt_rasize:
334 fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
335 break;
336 case Opt_caps_wanted_delay_min:
337 if (result.uint_32 < 1)
338 goto out_of_range;
339 fsopt->caps_wanted_delay_min = result.uint_32;
340 break;
341 case Opt_caps_wanted_delay_max:
342 if (result.uint_32 < 1)
343 goto out_of_range;
344 fsopt->caps_wanted_delay_max = result.uint_32;
345 break;
346 case Opt_caps_max:
347 if (result.int_32 < 0)
348 goto out_of_range;
349 fsopt->caps_max = result.int_32;
350 break;
351 case Opt_readdir_max_entries:
352 if (result.uint_32 < 1)
353 goto out_of_range;
354 fsopt->max_readdir = result.uint_32;
355 break;
356 case Opt_readdir_max_bytes:
357 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
358 goto out_of_range;
359 fsopt->max_readdir_bytes = result.uint_32;
360 break;
361 case Opt_congestion_kb:
362 if (result.uint_32 < 1024) /* at least 1M */
363 goto out_of_range;
364 fsopt->congestion_kb = result.uint_32;
365 break;
366 case Opt_dirstat:
367 if (!result.negated)
368 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
369 else
370 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
371 break;
372 case Opt_rbytes:
373 if (!result.negated)
374 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
375 else
376 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
377 break;
378 case Opt_asyncreaddir:
379 if (!result.negated)
380 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
381 else
382 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
383 break;
384 case Opt_dcache:
385 if (!result.negated)
386 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
387 else
388 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
389 break;
390 case Opt_ino32:
391 if (!result.negated)
392 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
393 else
394 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
395 break;
396
397 case Opt_fscache:
398 #ifdef CONFIG_CEPH_FSCACHE
399 kfree(fsopt->fscache_uniq);
400 fsopt->fscache_uniq = NULL;
401 if (result.negated) {
402 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
403 } else {
404 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
405 fsopt->fscache_uniq = param->string;
406 param->string = NULL;
407 }
408 break;
409 #else
410 return invalfc(fc, "fscache support is disabled");
411 #endif
412 case Opt_poolperm:
413 if (!result.negated)
414 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
415 else
416 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
417 break;
418 case Opt_require_active_mds:
419 if (!result.negated)
420 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
421 else
422 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
423 break;
424 case Opt_quotadf:
425 if (!result.negated)
426 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
427 else
428 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
429 break;
430 case Opt_copyfrom:
431 if (!result.negated)
432 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
433 else
434 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
435 break;
436 case Opt_acl:
437 if (!result.negated) {
438 #ifdef CONFIG_CEPH_FS_POSIX_ACL
439 fc->sb_flags |= SB_POSIXACL;
440 #else
441 return invalfc(fc, "POSIX ACL support is disabled");
442 #endif
443 } else {
444 fc->sb_flags &= ~SB_POSIXACL;
445 }
446 break;
447 default:
448 BUG();
449 }
450 return 0;
451
452 out_of_range:
453 return invalfc(fc, "%s out of range", param->key);
454 }
455
456 static void destroy_mount_options(struct ceph_mount_options *args)
457 {
458 dout("destroy_mount_options %p\n", args);
459 if (!args)
460 return;
461
462 kfree(args->snapdir_name);
463 kfree(args->mds_namespace);
464 kfree(args->server_path);
465 kfree(args->fscache_uniq);
466 kfree(args);
467 }
468
469 static int strcmp_null(const char *s1, const char *s2)
470 {
471 if (!s1 && !s2)
472 return 0;
473 if (s1 && !s2)
474 return -1;
475 if (!s1 && s2)
476 return 1;
477 return strcmp(s1, s2);
478 }
479
480 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
481 struct ceph_options *new_opt,
482 struct ceph_fs_client *fsc)
483 {
484 struct ceph_mount_options *fsopt1 = new_fsopt;
485 struct ceph_mount_options *fsopt2 = fsc->mount_options;
486 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
487 int ret;
488
489 ret = memcmp(fsopt1, fsopt2, ofs);
490 if (ret)
491 return ret;
492
493 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
494 if (ret)
495 return ret;
496
497 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
498 if (ret)
499 return ret;
500
501 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
502 if (ret)
503 return ret;
504
505 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
506 if (ret)
507 return ret;
508
509 return ceph_compare_options(new_opt, fsc->client);
510 }
511
512 /**
513 * ceph_show_options - Show mount options in /proc/mounts
514 * @m: seq_file to write to
515 * @root: root of that (sub)tree
516 */
517 static int ceph_show_options(struct seq_file *m, struct dentry *root)
518 {
519 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
520 struct ceph_mount_options *fsopt = fsc->mount_options;
521 size_t pos;
522 int ret;
523
524 /* a comma between MNT/MS and client options */
525 seq_putc(m, ',');
526 pos = m->count;
527
528 ret = ceph_print_client_options(m, fsc->client, false);
529 if (ret)
530 return ret;
531
532 /* retract our comma if no client options */
533 if (m->count == pos)
534 m->count--;
535
536 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
537 seq_puts(m, ",dirstat");
538 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
539 seq_puts(m, ",rbytes");
540 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
541 seq_puts(m, ",noasyncreaddir");
542 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
543 seq_puts(m, ",nodcache");
544 if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
545 seq_puts(m, ",ino32");
546 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
547 seq_show_option(m, "fsc", fsopt->fscache_uniq);
548 }
549 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
550 seq_puts(m, ",nopoolperm");
551 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
552 seq_puts(m, ",noquotadf");
553
554 #ifdef CONFIG_CEPH_FS_POSIX_ACL
555 if (root->d_sb->s_flags & SB_POSIXACL)
556 seq_puts(m, ",acl");
557 else
558 seq_puts(m, ",noacl");
559 #endif
560
561 if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
562 seq_puts(m, ",copyfrom");
563
564 if (fsopt->mds_namespace)
565 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
566
567 if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
568 seq_show_option(m, "recover_session", "clean");
569
570 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
571 seq_printf(m, ",wsize=%u", fsopt->wsize);
572 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
573 seq_printf(m, ",rsize=%u", fsopt->rsize);
574 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
575 seq_printf(m, ",rasize=%u", fsopt->rasize);
576 if (fsopt->congestion_kb != default_congestion_kb())
577 seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
578 if (fsopt->caps_max)
579 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
580 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
581 seq_printf(m, ",caps_wanted_delay_min=%u",
582 fsopt->caps_wanted_delay_min);
583 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
584 seq_printf(m, ",caps_wanted_delay_max=%u",
585 fsopt->caps_wanted_delay_max);
586 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
587 seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
588 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
589 seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
590 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
591 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
592
593 return 0;
594 }
595
596 /*
597 * handle any mon messages the standard library doesn't understand.
598 * return error if we don't either.
599 */
600 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
601 {
602 struct ceph_fs_client *fsc = client->private;
603 int type = le16_to_cpu(msg->hdr.type);
604
605 switch (type) {
606 case CEPH_MSG_MDS_MAP:
607 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
608 return 0;
609 case CEPH_MSG_FS_MAP_USER:
610 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
611 return 0;
612 default:
613 return -1;
614 }
615 }
616
617 /*
618 * create a new fs client
619 *
620 * Success or not, this function consumes @fsopt and @opt.
621 */
622 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
623 struct ceph_options *opt)
624 {
625 struct ceph_fs_client *fsc;
626 int page_count;
627 size_t size;
628 int err;
629
630 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
631 if (!fsc) {
632 err = -ENOMEM;
633 goto fail;
634 }
635
636 fsc->client = ceph_create_client(opt, fsc);
637 if (IS_ERR(fsc->client)) {
638 err = PTR_ERR(fsc->client);
639 goto fail;
640 }
641 opt = NULL; /* fsc->client now owns this */
642
643 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
644 ceph_set_opt(fsc->client, ABORT_ON_FULL);
645
646 if (!fsopt->mds_namespace) {
647 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
648 0, true);
649 } else {
650 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
651 0, false);
652 }
653
654 fsc->mount_options = fsopt;
655
656 fsc->sb = NULL;
657 fsc->mount_state = CEPH_MOUNT_MOUNTING;
658 fsc->filp_gen = 1;
659 fsc->have_copy_from2 = true;
660
661 atomic_long_set(&fsc->writeback_count, 0);
662
663 err = -ENOMEM;
664 /*
665 * The number of concurrent works can be high but they don't need
666 * to be processed in parallel, limit concurrency.
667 */
668 fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
669 if (!fsc->inode_wq)
670 goto fail_client;
671 fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
672 if (!fsc->cap_wq)
673 goto fail_inode_wq;
674
675 /* set up mempools */
676 err = -ENOMEM;
677 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
678 size = sizeof (struct page *) * (page_count ? page_count : 1);
679 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
680 if (!fsc->wb_pagevec_pool)
681 goto fail_cap_wq;
682
683 return fsc;
684
685 fail_cap_wq:
686 destroy_workqueue(fsc->cap_wq);
687 fail_inode_wq:
688 destroy_workqueue(fsc->inode_wq);
689 fail_client:
690 ceph_destroy_client(fsc->client);
691 fail:
692 kfree(fsc);
693 if (opt)
694 ceph_destroy_options(opt);
695 destroy_mount_options(fsopt);
696 return ERR_PTR(err);
697 }
698
699 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
700 {
701 flush_workqueue(fsc->inode_wq);
702 flush_workqueue(fsc->cap_wq);
703 }
704
705 static void destroy_fs_client(struct ceph_fs_client *fsc)
706 {
707 dout("destroy_fs_client %p\n", fsc);
708
709 ceph_mdsc_destroy(fsc);
710 destroy_workqueue(fsc->inode_wq);
711 destroy_workqueue(fsc->cap_wq);
712
713 mempool_destroy(fsc->wb_pagevec_pool);
714
715 destroy_mount_options(fsc->mount_options);
716
717 ceph_destroy_client(fsc->client);
718
719 kfree(fsc);
720 dout("destroy_fs_client %p done\n", fsc);
721 }
722
723 /*
724 * caches
725 */
726 struct kmem_cache *ceph_inode_cachep;
727 struct kmem_cache *ceph_cap_cachep;
728 struct kmem_cache *ceph_cap_flush_cachep;
729 struct kmem_cache *ceph_dentry_cachep;
730 struct kmem_cache *ceph_file_cachep;
731 struct kmem_cache *ceph_dir_file_cachep;
732
733 static void ceph_inode_init_once(void *foo)
734 {
735 struct ceph_inode_info *ci = foo;
736 inode_init_once(&ci->vfs_inode);
737 }
738
739 static int __init init_caches(void)
740 {
741 int error = -ENOMEM;
742
743 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
744 sizeof(struct ceph_inode_info),
745 __alignof__(struct ceph_inode_info),
746 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
747 SLAB_ACCOUNT, ceph_inode_init_once);
748 if (!ceph_inode_cachep)
749 return -ENOMEM;
750
751 ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
752 if (!ceph_cap_cachep)
753 goto bad_cap;
754 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
755 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
756 if (!ceph_cap_flush_cachep)
757 goto bad_cap_flush;
758
759 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
760 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
761 if (!ceph_dentry_cachep)
762 goto bad_dentry;
763
764 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
765 if (!ceph_file_cachep)
766 goto bad_file;
767
768 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
769 if (!ceph_dir_file_cachep)
770 goto bad_dir_file;
771
772 error = ceph_fscache_register();
773 if (error)
774 goto bad_fscache;
775
776 return 0;
777
778 bad_fscache:
779 kmem_cache_destroy(ceph_dir_file_cachep);
780 bad_dir_file:
781 kmem_cache_destroy(ceph_file_cachep);
782 bad_file:
783 kmem_cache_destroy(ceph_dentry_cachep);
784 bad_dentry:
785 kmem_cache_destroy(ceph_cap_flush_cachep);
786 bad_cap_flush:
787 kmem_cache_destroy(ceph_cap_cachep);
788 bad_cap:
789 kmem_cache_destroy(ceph_inode_cachep);
790 return error;
791 }
792
793 static void destroy_caches(void)
794 {
795 /*
796 * Make sure all delayed rcu free inodes are flushed before we
797 * destroy cache.
798 */
799 rcu_barrier();
800
801 kmem_cache_destroy(ceph_inode_cachep);
802 kmem_cache_destroy(ceph_cap_cachep);
803 kmem_cache_destroy(ceph_cap_flush_cachep);
804 kmem_cache_destroy(ceph_dentry_cachep);
805 kmem_cache_destroy(ceph_file_cachep);
806 kmem_cache_destroy(ceph_dir_file_cachep);
807
808 ceph_fscache_unregister();
809 }
810
811 /*
812 * ceph_umount_begin - initiate forced umount. Tear down down the
813 * mount, skipping steps that may hang while waiting for server(s).
814 */
815 static void ceph_umount_begin(struct super_block *sb)
816 {
817 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
818
819 dout("ceph_umount_begin - starting forced umount\n");
820 if (!fsc)
821 return;
822 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
823 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
824 ceph_mdsc_force_umount(fsc->mdsc);
825 fsc->filp_gen++; // invalidate open files
826 }
827
828 static const struct super_operations ceph_super_ops = {
829 .alloc_inode = ceph_alloc_inode,
830 .free_inode = ceph_free_inode,
831 .write_inode = ceph_write_inode,
832 .drop_inode = generic_delete_inode,
833 .evict_inode = ceph_evict_inode,
834 .sync_fs = ceph_sync_fs,
835 .put_super = ceph_put_super,
836 .show_options = ceph_show_options,
837 .statfs = ceph_statfs,
838 .umount_begin = ceph_umount_begin,
839 };
840
841 /*
842 * Bootstrap mount by opening the root directory. Note the mount
843 * @started time from caller, and time out if this takes too long.
844 */
845 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
846 const char *path,
847 unsigned long started)
848 {
849 struct ceph_mds_client *mdsc = fsc->mdsc;
850 struct ceph_mds_request *req = NULL;
851 int err;
852 struct dentry *root;
853
854 /* open dir */
855 dout("open_root_inode opening '%s'\n", path);
856 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
857 if (IS_ERR(req))
858 return ERR_CAST(req);
859 req->r_path1 = kstrdup(path, GFP_NOFS);
860 if (!req->r_path1) {
861 root = ERR_PTR(-ENOMEM);
862 goto out;
863 }
864
865 req->r_ino1.ino = CEPH_INO_ROOT;
866 req->r_ino1.snap = CEPH_NOSNAP;
867 req->r_started = started;
868 req->r_timeout = fsc->client->options->mount_timeout;
869 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
870 req->r_num_caps = 2;
871 err = ceph_mdsc_do_request(mdsc, NULL, req);
872 if (err == 0) {
873 struct inode *inode = req->r_target_inode;
874 req->r_target_inode = NULL;
875 dout("open_root_inode success\n");
876 root = d_make_root(inode);
877 if (!root) {
878 root = ERR_PTR(-ENOMEM);
879 goto out;
880 }
881 dout("open_root_inode success, root dentry is %p\n", root);
882 } else {
883 root = ERR_PTR(err);
884 }
885 out:
886 ceph_mdsc_put_request(req);
887 return root;
888 }
889
890 /*
891 * mount: join the ceph cluster, and open root directory.
892 */
893 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
894 struct fs_context *fc)
895 {
896 int err;
897 unsigned long started = jiffies; /* note the start time */
898 struct dentry *root;
899
900 dout("mount start %p\n", fsc);
901 mutex_lock(&fsc->client->mount_mutex);
902
903 if (!fsc->sb->s_root) {
904 const char *path = fsc->mount_options->server_path ?
905 fsc->mount_options->server_path + 1 : "";
906
907 err = __ceph_open_session(fsc->client, started);
908 if (err < 0)
909 goto out;
910
911 /* setup fscache */
912 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
913 err = ceph_fscache_register_fs(fsc, fc);
914 if (err < 0)
915 goto out;
916 }
917
918 dout("mount opening path '%s'\n", path);
919
920 ceph_fs_debugfs_init(fsc);
921
922 root = open_root_dentry(fsc, path, started);
923 if (IS_ERR(root)) {
924 err = PTR_ERR(root);
925 goto out;
926 }
927 fsc->sb->s_root = dget(root);
928 } else {
929 root = dget(fsc->sb->s_root);
930 }
931
932 fsc->mount_state = CEPH_MOUNT_MOUNTED;
933 dout("mount success\n");
934 mutex_unlock(&fsc->client->mount_mutex);
935 return root;
936
937 out:
938 mutex_unlock(&fsc->client->mount_mutex);
939 return ERR_PTR(err);
940 }
941
942 static int ceph_set_super(struct super_block *s, struct fs_context *fc)
943 {
944 struct ceph_fs_client *fsc = s->s_fs_info;
945 int ret;
946
947 dout("set_super %p\n", s);
948
949 s->s_maxbytes = MAX_LFS_FILESIZE;
950
951 s->s_xattr = ceph_xattr_handlers;
952 fsc->sb = s;
953 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
954
955 s->s_op = &ceph_super_ops;
956 s->s_d_op = &ceph_dentry_ops;
957 s->s_export_op = &ceph_export_ops;
958
959 s->s_time_gran = 1;
960 s->s_time_min = 0;
961 s->s_time_max = U32_MAX;
962
963 ret = set_anon_super_fc(s, fc);
964 if (ret != 0)
965 fsc->sb = NULL;
966 return ret;
967 }
968
969 /*
970 * share superblock if same fs AND options
971 */
972 static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
973 {
974 struct ceph_fs_client *new = fc->s_fs_info;
975 struct ceph_mount_options *fsopt = new->mount_options;
976 struct ceph_options *opt = new->client->options;
977 struct ceph_fs_client *other = ceph_sb_to_client(sb);
978
979 dout("ceph_compare_super %p\n", sb);
980
981 if (compare_mount_options(fsopt, opt, other)) {
982 dout("monitor(s)/mount options don't match\n");
983 return 0;
984 }
985 if ((opt->flags & CEPH_OPT_FSID) &&
986 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
987 dout("fsid doesn't match\n");
988 return 0;
989 }
990 if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
991 dout("flags differ\n");
992 return 0;
993 }
994 return 1;
995 }
996
997 /*
998 * construct our own bdi so we can control readahead, etc.
999 */
1000 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1001
1002 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1003 {
1004 int err;
1005
1006 err = super_setup_bdi_name(sb, "ceph-%ld",
1007 atomic_long_inc_return(&bdi_seq));
1008 if (err)
1009 return err;
1010
1011 /* set ra_pages based on rasize mount option? */
1012 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1013
1014 /* set io_pages based on max osd read size */
1015 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1016
1017 return 0;
1018 }
1019
1020 static int ceph_get_tree(struct fs_context *fc)
1021 {
1022 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1023 struct super_block *sb;
1024 struct ceph_fs_client *fsc;
1025 struct dentry *res;
1026 int (*compare_super)(struct super_block *, struct fs_context *) =
1027 ceph_compare_super;
1028 int err;
1029
1030 dout("ceph_get_tree\n");
1031
1032 if (!fc->source)
1033 return invalfc(fc, "No source");
1034
1035 /* create client (which we may/may not use) */
1036 fsc = create_fs_client(pctx->opts, pctx->copts);
1037 pctx->opts = NULL;
1038 pctx->copts = NULL;
1039 if (IS_ERR(fsc)) {
1040 err = PTR_ERR(fsc);
1041 goto out_final;
1042 }
1043
1044 err = ceph_mdsc_init(fsc);
1045 if (err < 0)
1046 goto out;
1047
1048 if (ceph_test_opt(fsc->client, NOSHARE))
1049 compare_super = NULL;
1050
1051 fc->s_fs_info = fsc;
1052 sb = sget_fc(fc, compare_super, ceph_set_super);
1053 fc->s_fs_info = NULL;
1054 if (IS_ERR(sb)) {
1055 err = PTR_ERR(sb);
1056 goto out;
1057 }
1058
1059 if (ceph_sb_to_client(sb) != fsc) {
1060 destroy_fs_client(fsc);
1061 fsc = ceph_sb_to_client(sb);
1062 dout("get_sb got existing client %p\n", fsc);
1063 } else {
1064 dout("get_sb using new client %p\n", fsc);
1065 err = ceph_setup_bdi(sb, fsc);
1066 if (err < 0)
1067 goto out_splat;
1068 }
1069
1070 res = ceph_real_mount(fsc, fc);
1071 if (IS_ERR(res)) {
1072 err = PTR_ERR(res);
1073 goto out_splat;
1074 }
1075 dout("root %p inode %p ino %llx.%llx\n", res,
1076 d_inode(res), ceph_vinop(d_inode(res)));
1077 fc->root = fsc->sb->s_root;
1078 return 0;
1079
1080 out_splat:
1081 if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
1082 pr_info("No mds server is up or the cluster is laggy\n");
1083 err = -EHOSTUNREACH;
1084 }
1085
1086 ceph_mdsc_close_sessions(fsc->mdsc);
1087 deactivate_locked_super(sb);
1088 goto out_final;
1089
1090 out:
1091 destroy_fs_client(fsc);
1092 out_final:
1093 dout("ceph_get_tree fail %d\n", err);
1094 return err;
1095 }
1096
1097 static void ceph_free_fc(struct fs_context *fc)
1098 {
1099 struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1100
1101 if (pctx) {
1102 destroy_mount_options(pctx->opts);
1103 ceph_destroy_options(pctx->copts);
1104 kfree(pctx);
1105 }
1106 }
1107
1108 static int ceph_reconfigure_fc(struct fs_context *fc)
1109 {
1110 sync_filesystem(fc->root->d_sb);
1111 return 0;
1112 }
1113
1114 static const struct fs_context_operations ceph_context_ops = {
1115 .free = ceph_free_fc,
1116 .parse_param = ceph_parse_mount_param,
1117 .get_tree = ceph_get_tree,
1118 .reconfigure = ceph_reconfigure_fc,
1119 };
1120
1121 /*
1122 * Set up the filesystem mount context.
1123 */
1124 static int ceph_init_fs_context(struct fs_context *fc)
1125 {
1126 struct ceph_parse_opts_ctx *pctx;
1127 struct ceph_mount_options *fsopt;
1128
1129 pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1130 if (!pctx)
1131 return -ENOMEM;
1132
1133 pctx->copts = ceph_alloc_options();
1134 if (!pctx->copts)
1135 goto nomem;
1136
1137 pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1138 if (!pctx->opts)
1139 goto nomem;
1140
1141 fsopt = pctx->opts;
1142 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1143
1144 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1145 fsopt->rsize = CEPH_MAX_READ_SIZE;
1146 fsopt->rasize = CEPH_RASIZE_DEFAULT;
1147 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1148 if (!fsopt->snapdir_name)
1149 goto nomem;
1150
1151 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1152 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1153 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1154 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1155 fsopt->congestion_kb = default_congestion_kb();
1156
1157 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1158 fc->sb_flags |= SB_POSIXACL;
1159 #endif
1160
1161 fc->fs_private = pctx;
1162 fc->ops = &ceph_context_ops;
1163 return 0;
1164
1165 nomem:
1166 destroy_mount_options(pctx->opts);
1167 ceph_destroy_options(pctx->copts);
1168 kfree(pctx);
1169 return -ENOMEM;
1170 }
1171
1172 static void ceph_kill_sb(struct super_block *s)
1173 {
1174 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1175 dev_t dev = s->s_dev;
1176
1177 dout("kill_sb %p\n", s);
1178
1179 ceph_mdsc_pre_umount(fsc->mdsc);
1180 flush_fs_workqueues(fsc);
1181
1182 generic_shutdown_super(s);
1183
1184 fsc->client->extra_mon_dispatch = NULL;
1185 ceph_fs_debugfs_cleanup(fsc);
1186
1187 ceph_fscache_unregister_fs(fsc);
1188
1189 destroy_fs_client(fsc);
1190 free_anon_bdev(dev);
1191 }
1192
1193 static struct file_system_type ceph_fs_type = {
1194 .owner = THIS_MODULE,
1195 .name = "ceph",
1196 .init_fs_context = ceph_init_fs_context,
1197 .kill_sb = ceph_kill_sb,
1198 .fs_flags = FS_RENAME_DOES_D_MOVE,
1199 };
1200 MODULE_ALIAS_FS("ceph");
1201
1202 int ceph_force_reconnect(struct super_block *sb)
1203 {
1204 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1205 int err = 0;
1206
1207 ceph_umount_begin(sb);
1208
1209 /* Make sure all page caches get invalidated.
1210 * see remove_session_caps_cb() */
1211 flush_workqueue(fsc->inode_wq);
1212
1213 /* In case that we were blacklisted. This also reset
1214 * all mon/osd connections */
1215 ceph_reset_client_addr(fsc->client);
1216
1217 ceph_osdc_clear_abort_err(&fsc->client->osdc);
1218
1219 fsc->blacklisted = false;
1220 fsc->mount_state = CEPH_MOUNT_MOUNTED;
1221
1222 if (sb->s_root) {
1223 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1224 CEPH_STAT_CAP_INODE, true);
1225 }
1226 return err;
1227 }
1228
1229 static int __init init_ceph(void)
1230 {
1231 int ret = init_caches();
1232 if (ret)
1233 goto out;
1234
1235 ceph_flock_init();
1236 ret = register_filesystem(&ceph_fs_type);
1237 if (ret)
1238 goto out_caches;
1239
1240 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1241
1242 return 0;
1243
1244 out_caches:
1245 destroy_caches();
1246 out:
1247 return ret;
1248 }
1249
1250 static void __exit exit_ceph(void)
1251 {
1252 dout("exit_ceph\n");
1253 unregister_filesystem(&ceph_fs_type);
1254 destroy_caches();
1255 }
1256
1257 module_init(init_ceph);
1258 module_exit(exit_ceph);
1259
1260 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1261 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1262 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1263 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1264 MODULE_LICENSE("GPL");
Linux with added FPC-III support