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csky: Fix perf record in kernel/user space
[mirror_ubuntu-jammy-kernel.git] / fs / ceph / super.c
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/parser.h>
13 #include <linux/sched.h>
14 #include <linux/seq_file.h>
15 #include <linux/slab.h>
16 #include <linux/statfs.h>
17 #include <linux/string.h>
18
19 #include "super.h"
20 #include "mds_client.h"
21 #include "cache.h"
22
23 #include <linux/ceph/ceph_features.h>
24 #include <linux/ceph/decode.h>
25 #include <linux/ceph/mon_client.h>
26 #include <linux/ceph/auth.h>
27 #include <linux/ceph/debugfs.h>
28
29 /*
30 * Ceph superblock operations
31 *
32 * Handle the basics of mounting, unmounting.
33 */
34
35 /*
36 * super ops
37 */
38 static void ceph_put_super(struct super_block *s)
39 {
40 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
41
42 dout("put_super\n");
43 ceph_mdsc_close_sessions(fsc->mdsc);
44 }
45
46 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
47 {
48 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
49 struct ceph_mon_client *monc = &fsc->client->monc;
50 struct ceph_statfs st;
51 u64 fsid;
52 int err;
53 u64 data_pool;
54
55 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
56 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
57 } else {
58 data_pool = CEPH_NOPOOL;
59 }
60
61 dout("statfs\n");
62 err = ceph_monc_do_statfs(monc, data_pool, &st);
63 if (err < 0)
64 return err;
65
66 /* fill in kstatfs */
67 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
68
69 /*
70 * express utilization in terms of large blocks to avoid
71 * overflow on 32-bit machines.
72 *
73 * NOTE: for the time being, we make bsize == frsize to humor
74 * not-yet-ancient versions of glibc that are broken.
75 * Someday, we will probably want to report a real block
76 * size... whatever that may mean for a network file system!
77 */
78 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
79 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
80
81 /*
82 * By default use root quota for stats; fallback to overall filesystem
83 * usage if using 'noquotadf' mount option or if the root dir doesn't
84 * have max_bytes quota set.
85 */
86 if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
87 !ceph_quota_update_statfs(fsc, buf)) {
88 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
89 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
90 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
91 }
92
93 buf->f_files = le64_to_cpu(st.num_objects);
94 buf->f_ffree = -1;
95 buf->f_namelen = NAME_MAX;
96
97 /* Must convert the fsid, for consistent values across arches */
98 mutex_lock(&monc->mutex);
99 fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
100 le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
101 mutex_unlock(&monc->mutex);
102
103 buf->f_fsid.val[0] = fsid & 0xffffffff;
104 buf->f_fsid.val[1] = fsid >> 32;
105
106 return 0;
107 }
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 Opt_last_int,
142 /* int args above */
143 Opt_snapdirname,
144 Opt_mds_namespace,
145 Opt_fscache_uniq,
146 Opt_last_string,
147 /* string args above */
148 Opt_dirstat,
149 Opt_nodirstat,
150 Opt_rbytes,
151 Opt_norbytes,
152 Opt_asyncreaddir,
153 Opt_noasyncreaddir,
154 Opt_dcache,
155 Opt_nodcache,
156 Opt_ino32,
157 Opt_noino32,
158 Opt_fscache,
159 Opt_nofscache,
160 Opt_poolperm,
161 Opt_nopoolperm,
162 Opt_require_active_mds,
163 Opt_norequire_active_mds,
164 #ifdef CONFIG_CEPH_FS_POSIX_ACL
165 Opt_acl,
166 #endif
167 Opt_noacl,
168 Opt_quotadf,
169 Opt_noquotadf,
170 Opt_copyfrom,
171 Opt_nocopyfrom,
172 };
173
174 static match_table_t fsopt_tokens = {
175 {Opt_wsize, "wsize=%d"},
176 {Opt_rsize, "rsize=%d"},
177 {Opt_rasize, "rasize=%d"},
178 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
179 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
180 {Opt_caps_max, "caps_max=%d"},
181 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
182 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
183 {Opt_congestion_kb, "write_congestion_kb=%d"},
184 /* int args above */
185 {Opt_snapdirname, "snapdirname=%s"},
186 {Opt_mds_namespace, "mds_namespace=%s"},
187 {Opt_fscache_uniq, "fsc=%s"},
188 /* string args above */
189 {Opt_dirstat, "dirstat"},
190 {Opt_nodirstat, "nodirstat"},
191 {Opt_rbytes, "rbytes"},
192 {Opt_norbytes, "norbytes"},
193 {Opt_asyncreaddir, "asyncreaddir"},
194 {Opt_noasyncreaddir, "noasyncreaddir"},
195 {Opt_dcache, "dcache"},
196 {Opt_nodcache, "nodcache"},
197 {Opt_ino32, "ino32"},
198 {Opt_noino32, "noino32"},
199 {Opt_fscache, "fsc"},
200 {Opt_nofscache, "nofsc"},
201 {Opt_poolperm, "poolperm"},
202 {Opt_nopoolperm, "nopoolperm"},
203 {Opt_require_active_mds, "require_active_mds"},
204 {Opt_norequire_active_mds, "norequire_active_mds"},
205 #ifdef CONFIG_CEPH_FS_POSIX_ACL
206 {Opt_acl, "acl"},
207 #endif
208 {Opt_noacl, "noacl"},
209 {Opt_quotadf, "quotadf"},
210 {Opt_noquotadf, "noquotadf"},
211 {Opt_copyfrom, "copyfrom"},
212 {Opt_nocopyfrom, "nocopyfrom"},
213 {-1, NULL}
214 };
215
216 static int parse_fsopt_token(char *c, void *private)
217 {
218 struct ceph_mount_options *fsopt = private;
219 substring_t argstr[MAX_OPT_ARGS];
220 int token, intval, ret;
221
222 token = match_token((char *)c, fsopt_tokens, argstr);
223 if (token < 0)
224 return -EINVAL;
225
226 if (token < Opt_last_int) {
227 ret = match_int(&argstr[0], &intval);
228 if (ret < 0) {
229 pr_err("bad option arg (not int) at '%s'\n", c);
230 return ret;
231 }
232 dout("got int token %d val %d\n", token, intval);
233 } else if (token > Opt_last_int && token < Opt_last_string) {
234 dout("got string token %d val %s\n", token,
235 argstr[0].from);
236 } else {
237 dout("got token %d\n", token);
238 }
239
240 switch (token) {
241 case Opt_snapdirname:
242 kfree(fsopt->snapdir_name);
243 fsopt->snapdir_name = kstrndup(argstr[0].from,
244 argstr[0].to-argstr[0].from,
245 GFP_KERNEL);
246 if (!fsopt->snapdir_name)
247 return -ENOMEM;
248 break;
249 case Opt_mds_namespace:
250 kfree(fsopt->mds_namespace);
251 fsopt->mds_namespace = kstrndup(argstr[0].from,
252 argstr[0].to-argstr[0].from,
253 GFP_KERNEL);
254 if (!fsopt->mds_namespace)
255 return -ENOMEM;
256 break;
257 case Opt_fscache_uniq:
258 kfree(fsopt->fscache_uniq);
259 fsopt->fscache_uniq = kstrndup(argstr[0].from,
260 argstr[0].to-argstr[0].from,
261 GFP_KERNEL);
262 if (!fsopt->fscache_uniq)
263 return -ENOMEM;
264 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
265 break;
266 /* misc */
267 case Opt_wsize:
268 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
269 return -EINVAL;
270 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
271 break;
272 case Opt_rsize:
273 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
274 return -EINVAL;
275 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
276 break;
277 case Opt_rasize:
278 if (intval < 0)
279 return -EINVAL;
280 fsopt->rasize = ALIGN(intval, PAGE_SIZE);
281 break;
282 case Opt_caps_wanted_delay_min:
283 if (intval < 1)
284 return -EINVAL;
285 fsopt->caps_wanted_delay_min = intval;
286 break;
287 case Opt_caps_wanted_delay_max:
288 if (intval < 1)
289 return -EINVAL;
290 fsopt->caps_wanted_delay_max = intval;
291 break;
292 case Opt_caps_max:
293 if (intval < 0)
294 return -EINVAL;
295 fsopt->caps_max = intval;
296 break;
297 case Opt_readdir_max_entries:
298 if (intval < 1)
299 return -EINVAL;
300 fsopt->max_readdir = intval;
301 break;
302 case Opt_readdir_max_bytes:
303 if (intval < (int)PAGE_SIZE && intval != 0)
304 return -EINVAL;
305 fsopt->max_readdir_bytes = intval;
306 break;
307 case Opt_congestion_kb:
308 if (intval < 1024) /* at least 1M */
309 return -EINVAL;
310 fsopt->congestion_kb = intval;
311 break;
312 case Opt_dirstat:
313 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
314 break;
315 case Opt_nodirstat:
316 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
317 break;
318 case Opt_rbytes:
319 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
320 break;
321 case Opt_norbytes:
322 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
323 break;
324 case Opt_asyncreaddir:
325 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
326 break;
327 case Opt_noasyncreaddir:
328 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
329 break;
330 case Opt_dcache:
331 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
332 break;
333 case Opt_nodcache:
334 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
335 break;
336 case Opt_ino32:
337 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
338 break;
339 case Opt_noino32:
340 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
341 break;
342 case Opt_fscache:
343 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
344 kfree(fsopt->fscache_uniq);
345 fsopt->fscache_uniq = NULL;
346 break;
347 case Opt_nofscache:
348 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
349 kfree(fsopt->fscache_uniq);
350 fsopt->fscache_uniq = NULL;
351 break;
352 case Opt_poolperm:
353 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
354 break;
355 case Opt_nopoolperm:
356 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
357 break;
358 case Opt_require_active_mds:
359 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
360 break;
361 case Opt_norequire_active_mds:
362 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
363 break;
364 case Opt_quotadf:
365 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
366 break;
367 case Opt_noquotadf:
368 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
369 break;
370 case Opt_copyfrom:
371 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
372 break;
373 case Opt_nocopyfrom:
374 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
375 break;
376 #ifdef CONFIG_CEPH_FS_POSIX_ACL
377 case Opt_acl:
378 fsopt->sb_flags |= SB_POSIXACL;
379 break;
380 #endif
381 case Opt_noacl:
382 fsopt->sb_flags &= ~SB_POSIXACL;
383 break;
384 default:
385 BUG_ON(token);
386 }
387 return 0;
388 }
389
390 static void destroy_mount_options(struct ceph_mount_options *args)
391 {
392 dout("destroy_mount_options %p\n", args);
393 kfree(args->snapdir_name);
394 kfree(args->mds_namespace);
395 kfree(args->server_path);
396 kfree(args->fscache_uniq);
397 kfree(args);
398 }
399
400 static int strcmp_null(const char *s1, const char *s2)
401 {
402 if (!s1 && !s2)
403 return 0;
404 if (s1 && !s2)
405 return -1;
406 if (!s1 && s2)
407 return 1;
408 return strcmp(s1, s2);
409 }
410
411 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
412 struct ceph_options *new_opt,
413 struct ceph_fs_client *fsc)
414 {
415 struct ceph_mount_options *fsopt1 = new_fsopt;
416 struct ceph_mount_options *fsopt2 = fsc->mount_options;
417 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
418 int ret;
419
420 ret = memcmp(fsopt1, fsopt2, ofs);
421 if (ret)
422 return ret;
423
424 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
425 if (ret)
426 return ret;
427 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
428 if (ret)
429 return ret;
430 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
431 if (ret)
432 return ret;
433 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
434 if (ret)
435 return ret;
436
437 return ceph_compare_options(new_opt, fsc->client);
438 }
439
440 static int parse_mount_options(struct ceph_mount_options **pfsopt,
441 struct ceph_options **popt,
442 int flags, char *options,
443 const char *dev_name)
444 {
445 struct ceph_mount_options *fsopt;
446 const char *dev_name_end;
447 int err;
448
449 if (!dev_name || !*dev_name)
450 return -EINVAL;
451
452 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
453 if (!fsopt)
454 return -ENOMEM;
455
456 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
457
458 fsopt->sb_flags = flags;
459 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
460
461 fsopt->wsize = CEPH_MAX_WRITE_SIZE;
462 fsopt->rsize = CEPH_MAX_READ_SIZE;
463 fsopt->rasize = CEPH_RASIZE_DEFAULT;
464 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
465 if (!fsopt->snapdir_name) {
466 err = -ENOMEM;
467 goto out;
468 }
469
470 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
471 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
472 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
473 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
474 fsopt->congestion_kb = default_congestion_kb();
475
476 /*
477 * Distinguish the server list from the path in "dev_name".
478 * Internally we do not include the leading '/' in the path.
479 *
480 * "dev_name" will look like:
481 * <server_spec>[,<server_spec>...]:[<path>]
482 * where
483 * <server_spec> is <ip>[:<port>]
484 * <path> is optional, but if present must begin with '/'
485 */
486 dev_name_end = strchr(dev_name, '/');
487 if (dev_name_end) {
488 if (strlen(dev_name_end) > 1) {
489 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
490 if (!fsopt->server_path) {
491 err = -ENOMEM;
492 goto out;
493 }
494 }
495 } else {
496 dev_name_end = dev_name + strlen(dev_name);
497 }
498 err = -EINVAL;
499 dev_name_end--; /* back up to ':' separator */
500 if (dev_name_end < dev_name || *dev_name_end != ':') {
501 pr_err("device name is missing path (no : separator in %s)\n",
502 dev_name);
503 goto out;
504 }
505 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
506 if (fsopt->server_path)
507 dout("server path '%s'\n", fsopt->server_path);
508
509 *popt = ceph_parse_options(options, dev_name, dev_name_end,
510 parse_fsopt_token, (void *)fsopt);
511 if (IS_ERR(*popt)) {
512 err = PTR_ERR(*popt);
513 goto out;
514 }
515
516 /* success */
517 *pfsopt = fsopt;
518 return 0;
519
520 out:
521 destroy_mount_options(fsopt);
522 return err;
523 }
524
525 /**
526 * ceph_show_options - Show mount options in /proc/mounts
527 * @m: seq_file to write to
528 * @root: root of that (sub)tree
529 */
530 static int ceph_show_options(struct seq_file *m, struct dentry *root)
531 {
532 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
533 struct ceph_mount_options *fsopt = fsc->mount_options;
534 size_t pos;
535 int ret;
536
537 /* a comma between MNT/MS and client options */
538 seq_putc(m, ',');
539 pos = m->count;
540
541 ret = ceph_print_client_options(m, fsc->client, false);
542 if (ret)
543 return ret;
544
545 /* retract our comma if no client options */
546 if (m->count == pos)
547 m->count--;
548
549 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
550 seq_puts(m, ",dirstat");
551 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
552 seq_puts(m, ",rbytes");
553 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
554 seq_puts(m, ",noasyncreaddir");
555 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
556 seq_puts(m, ",nodcache");
557 if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
558 seq_puts(m, ",ino32");
559 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
560 seq_show_option(m, "fsc", fsopt->fscache_uniq);
561 }
562 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
563 seq_puts(m, ",nopoolperm");
564 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
565 seq_puts(m, ",noquotadf");
566
567 #ifdef CONFIG_CEPH_FS_POSIX_ACL
568 if (fsopt->sb_flags & SB_POSIXACL)
569 seq_puts(m, ",acl");
570 else
571 seq_puts(m, ",noacl");
572 #endif
573
574 if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
575 seq_puts(m, ",copyfrom");
576
577 if (fsopt->mds_namespace)
578 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
579 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
580 seq_printf(m, ",wsize=%d", fsopt->wsize);
581 if (fsopt->rsize != CEPH_MAX_READ_SIZE)
582 seq_printf(m, ",rsize=%d", fsopt->rsize);
583 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
584 seq_printf(m, ",rasize=%d", fsopt->rasize);
585 if (fsopt->congestion_kb != default_congestion_kb())
586 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
587 if (fsopt->caps_max)
588 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
589 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
590 seq_printf(m, ",caps_wanted_delay_min=%d",
591 fsopt->caps_wanted_delay_min);
592 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
593 seq_printf(m, ",caps_wanted_delay_max=%d",
594 fsopt->caps_wanted_delay_max);
595 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
596 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
597 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
598 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
599 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
600 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
601
602 return 0;
603 }
604
605 /*
606 * handle any mon messages the standard library doesn't understand.
607 * return error if we don't either.
608 */
609 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
610 {
611 struct ceph_fs_client *fsc = client->private;
612 int type = le16_to_cpu(msg->hdr.type);
613
614 switch (type) {
615 case CEPH_MSG_MDS_MAP:
616 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
617 return 0;
618 case CEPH_MSG_FS_MAP_USER:
619 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
620 return 0;
621 default:
622 return -1;
623 }
624 }
625
626 /*
627 * create a new fs client
628 *
629 * Success or not, this function consumes @fsopt and @opt.
630 */
631 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
632 struct ceph_options *opt)
633 {
634 struct ceph_fs_client *fsc;
635 int page_count;
636 size_t size;
637 int err;
638
639 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
640 if (!fsc) {
641 err = -ENOMEM;
642 goto fail;
643 }
644
645 fsc->client = ceph_create_client(opt, fsc);
646 if (IS_ERR(fsc->client)) {
647 err = PTR_ERR(fsc->client);
648 goto fail;
649 }
650 opt = NULL; /* fsc->client now owns this */
651
652 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
653 ceph_set_opt(fsc->client, ABORT_ON_FULL);
654
655 if (!fsopt->mds_namespace) {
656 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
657 0, true);
658 } else {
659 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
660 0, false);
661 }
662
663 fsc->mount_options = fsopt;
664
665 fsc->sb = NULL;
666 fsc->mount_state = CEPH_MOUNT_MOUNTING;
667
668 atomic_long_set(&fsc->writeback_count, 0);
669
670 err = -ENOMEM;
671 /*
672 * The number of concurrent works can be high but they don't need
673 * to be processed in parallel, limit concurrency.
674 */
675 fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
676 if (!fsc->inode_wq)
677 goto fail_client;
678 fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
679 if (!fsc->cap_wq)
680 goto fail_inode_wq;
681
682 /* set up mempools */
683 err = -ENOMEM;
684 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
685 size = sizeof (struct page *) * (page_count ? page_count : 1);
686 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
687 if (!fsc->wb_pagevec_pool)
688 goto fail_cap_wq;
689
690 return fsc;
691
692 fail_cap_wq:
693 destroy_workqueue(fsc->cap_wq);
694 fail_inode_wq:
695 destroy_workqueue(fsc->inode_wq);
696 fail_client:
697 ceph_destroy_client(fsc->client);
698 fail:
699 kfree(fsc);
700 if (opt)
701 ceph_destroy_options(opt);
702 destroy_mount_options(fsopt);
703 return ERR_PTR(err);
704 }
705
706 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
707 {
708 flush_workqueue(fsc->inode_wq);
709 flush_workqueue(fsc->cap_wq);
710 }
711
712 static void destroy_fs_client(struct ceph_fs_client *fsc)
713 {
714 dout("destroy_fs_client %p\n", fsc);
715
716 destroy_workqueue(fsc->inode_wq);
717 destroy_workqueue(fsc->cap_wq);
718
719 mempool_destroy(fsc->wb_pagevec_pool);
720
721 destroy_mount_options(fsc->mount_options);
722
723 ceph_destroy_client(fsc->client);
724
725 kfree(fsc);
726 dout("destroy_fs_client %p done\n", fsc);
727 }
728
729 /*
730 * caches
731 */
732 struct kmem_cache *ceph_inode_cachep;
733 struct kmem_cache *ceph_cap_cachep;
734 struct kmem_cache *ceph_cap_flush_cachep;
735 struct kmem_cache *ceph_dentry_cachep;
736 struct kmem_cache *ceph_file_cachep;
737 struct kmem_cache *ceph_dir_file_cachep;
738
739 static void ceph_inode_init_once(void *foo)
740 {
741 struct ceph_inode_info *ci = foo;
742 inode_init_once(&ci->vfs_inode);
743 }
744
745 static int __init init_caches(void)
746 {
747 int error = -ENOMEM;
748
749 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
750 sizeof(struct ceph_inode_info),
751 __alignof__(struct ceph_inode_info),
752 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
753 SLAB_ACCOUNT, ceph_inode_init_once);
754 if (!ceph_inode_cachep)
755 return -ENOMEM;
756
757 ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
758 if (!ceph_cap_cachep)
759 goto bad_cap;
760 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
761 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
762 if (!ceph_cap_flush_cachep)
763 goto bad_cap_flush;
764
765 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
766 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
767 if (!ceph_dentry_cachep)
768 goto bad_dentry;
769
770 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
771 if (!ceph_file_cachep)
772 goto bad_file;
773
774 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
775 if (!ceph_dir_file_cachep)
776 goto bad_dir_file;
777
778 error = ceph_fscache_register();
779 if (error)
780 goto bad_fscache;
781
782 return 0;
783
784 bad_fscache:
785 kmem_cache_destroy(ceph_dir_file_cachep);
786 bad_dir_file:
787 kmem_cache_destroy(ceph_file_cachep);
788 bad_file:
789 kmem_cache_destroy(ceph_dentry_cachep);
790 bad_dentry:
791 kmem_cache_destroy(ceph_cap_flush_cachep);
792 bad_cap_flush:
793 kmem_cache_destroy(ceph_cap_cachep);
794 bad_cap:
795 kmem_cache_destroy(ceph_inode_cachep);
796 return error;
797 }
798
799 static void destroy_caches(void)
800 {
801 /*
802 * Make sure all delayed rcu free inodes are flushed before we
803 * destroy cache.
804 */
805 rcu_barrier();
806
807 kmem_cache_destroy(ceph_inode_cachep);
808 kmem_cache_destroy(ceph_cap_cachep);
809 kmem_cache_destroy(ceph_cap_flush_cachep);
810 kmem_cache_destroy(ceph_dentry_cachep);
811 kmem_cache_destroy(ceph_file_cachep);
812 kmem_cache_destroy(ceph_dir_file_cachep);
813
814 ceph_fscache_unregister();
815 }
816
817
818 /*
819 * ceph_umount_begin - initiate forced umount. Tear down down the
820 * mount, skipping steps that may hang while waiting for server(s).
821 */
822 static void ceph_umount_begin(struct super_block *sb)
823 {
824 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
825
826 dout("ceph_umount_begin - starting forced umount\n");
827 if (!fsc)
828 return;
829 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
830 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
831 ceph_mdsc_force_umount(fsc->mdsc);
832 return;
833 }
834
835 static int ceph_remount(struct super_block *sb, int *flags, char *data)
836 {
837 sync_filesystem(sb);
838 return 0;
839 }
840
841 static const struct super_operations ceph_super_ops = {
842 .alloc_inode = ceph_alloc_inode,
843 .destroy_inode = ceph_destroy_inode,
844 .free_inode = ceph_free_inode,
845 .write_inode = ceph_write_inode,
846 .drop_inode = ceph_drop_inode,
847 .sync_fs = ceph_sync_fs,
848 .put_super = ceph_put_super,
849 .remount_fs = ceph_remount,
850 .show_options = ceph_show_options,
851 .statfs = ceph_statfs,
852 .umount_begin = ceph_umount_begin,
853 };
854
855 /*
856 * Bootstrap mount by opening the root directory. Note the mount
857 * @started time from caller, and time out if this takes too long.
858 */
859 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
860 const char *path,
861 unsigned long started)
862 {
863 struct ceph_mds_client *mdsc = fsc->mdsc;
864 struct ceph_mds_request *req = NULL;
865 int err;
866 struct dentry *root;
867
868 /* open dir */
869 dout("open_root_inode opening '%s'\n", path);
870 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
871 if (IS_ERR(req))
872 return ERR_CAST(req);
873 req->r_path1 = kstrdup(path, GFP_NOFS);
874 if (!req->r_path1) {
875 root = ERR_PTR(-ENOMEM);
876 goto out;
877 }
878
879 req->r_ino1.ino = CEPH_INO_ROOT;
880 req->r_ino1.snap = CEPH_NOSNAP;
881 req->r_started = started;
882 req->r_timeout = fsc->client->options->mount_timeout;
883 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
884 req->r_num_caps = 2;
885 err = ceph_mdsc_do_request(mdsc, NULL, req);
886 if (err == 0) {
887 struct inode *inode = req->r_target_inode;
888 req->r_target_inode = NULL;
889 dout("open_root_inode success\n");
890 root = d_make_root(inode);
891 if (!root) {
892 root = ERR_PTR(-ENOMEM);
893 goto out;
894 }
895 dout("open_root_inode success, root dentry is %p\n", root);
896 } else {
897 root = ERR_PTR(err);
898 }
899 out:
900 ceph_mdsc_put_request(req);
901 return root;
902 }
903
904
905
906
907 /*
908 * mount: join the ceph cluster, and open root directory.
909 */
910 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
911 {
912 int err;
913 unsigned long started = jiffies; /* note the start time */
914 struct dentry *root;
915
916 dout("mount start %p\n", fsc);
917 mutex_lock(&fsc->client->mount_mutex);
918
919 if (!fsc->sb->s_root) {
920 const char *path;
921 err = __ceph_open_session(fsc->client, started);
922 if (err < 0)
923 goto out;
924
925 /* setup fscache */
926 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
927 err = ceph_fscache_register_fs(fsc);
928 if (err < 0)
929 goto out;
930 }
931
932 if (!fsc->mount_options->server_path) {
933 path = "";
934 dout("mount opening path \\t\n");
935 } else {
936 path = fsc->mount_options->server_path + 1;
937 dout("mount opening path %s\n", path);
938 }
939
940 err = ceph_fs_debugfs_init(fsc);
941 if (err < 0)
942 goto out;
943
944 root = open_root_dentry(fsc, path, started);
945 if (IS_ERR(root)) {
946 err = PTR_ERR(root);
947 goto out;
948 }
949 fsc->sb->s_root = dget(root);
950 } else {
951 root = dget(fsc->sb->s_root);
952 }
953
954 fsc->mount_state = CEPH_MOUNT_MOUNTED;
955 dout("mount success\n");
956 mutex_unlock(&fsc->client->mount_mutex);
957 return root;
958
959 out:
960 mutex_unlock(&fsc->client->mount_mutex);
961 return ERR_PTR(err);
962 }
963
964 static int ceph_set_super(struct super_block *s, void *data)
965 {
966 struct ceph_fs_client *fsc = data;
967 int ret;
968
969 dout("set_super %p data %p\n", s, data);
970
971 s->s_flags = fsc->mount_options->sb_flags;
972 s->s_maxbytes = MAX_LFS_FILESIZE;
973
974 s->s_xattr = ceph_xattr_handlers;
975 s->s_fs_info = fsc;
976 fsc->sb = s;
977 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
978
979 s->s_op = &ceph_super_ops;
980 s->s_d_op = &ceph_dentry_ops;
981 s->s_export_op = &ceph_export_ops;
982
983 s->s_time_gran = 1000; /* 1000 ns == 1 us */
984
985 ret = set_anon_super(s, NULL); /* what is that second arg for? */
986 if (ret != 0)
987 goto fail;
988
989 return ret;
990
991 fail:
992 s->s_fs_info = NULL;
993 fsc->sb = NULL;
994 return ret;
995 }
996
997 /*
998 * share superblock if same fs AND options
999 */
1000 static int ceph_compare_super(struct super_block *sb, void *data)
1001 {
1002 struct ceph_fs_client *new = data;
1003 struct ceph_mount_options *fsopt = new->mount_options;
1004 struct ceph_options *opt = new->client->options;
1005 struct ceph_fs_client *other = ceph_sb_to_client(sb);
1006
1007 dout("ceph_compare_super %p\n", sb);
1008
1009 if (compare_mount_options(fsopt, opt, other)) {
1010 dout("monitor(s)/mount options don't match\n");
1011 return 0;
1012 }
1013 if ((opt->flags & CEPH_OPT_FSID) &&
1014 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1015 dout("fsid doesn't match\n");
1016 return 0;
1017 }
1018 if (fsopt->sb_flags != other->mount_options->sb_flags) {
1019 dout("flags differ\n");
1020 return 0;
1021 }
1022 return 1;
1023 }
1024
1025 /*
1026 * construct our own bdi so we can control readahead, etc.
1027 */
1028 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1029
1030 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1031 {
1032 int err;
1033
1034 err = super_setup_bdi_name(sb, "ceph-%ld",
1035 atomic_long_inc_return(&bdi_seq));
1036 if (err)
1037 return err;
1038
1039 /* set ra_pages based on rasize mount option? */
1040 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1041
1042 /* set io_pages based on max osd read size */
1043 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1044
1045 return 0;
1046 }
1047
1048 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1049 int flags, const char *dev_name, void *data)
1050 {
1051 struct super_block *sb;
1052 struct ceph_fs_client *fsc;
1053 struct dentry *res;
1054 int err;
1055 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1056 struct ceph_mount_options *fsopt = NULL;
1057 struct ceph_options *opt = NULL;
1058
1059 dout("ceph_mount\n");
1060
1061 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1062 flags |= SB_POSIXACL;
1063 #endif
1064 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1065 if (err < 0) {
1066 res = ERR_PTR(err);
1067 goto out_final;
1068 }
1069
1070 /* create client (which we may/may not use) */
1071 fsc = create_fs_client(fsopt, opt);
1072 if (IS_ERR(fsc)) {
1073 res = ERR_CAST(fsc);
1074 goto out_final;
1075 }
1076
1077 err = ceph_mdsc_init(fsc);
1078 if (err < 0) {
1079 res = ERR_PTR(err);
1080 goto out;
1081 }
1082
1083 if (ceph_test_opt(fsc->client, NOSHARE))
1084 compare_super = NULL;
1085 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1086 if (IS_ERR(sb)) {
1087 res = ERR_CAST(sb);
1088 goto out;
1089 }
1090
1091 if (ceph_sb_to_client(sb) != fsc) {
1092 ceph_mdsc_destroy(fsc);
1093 destroy_fs_client(fsc);
1094 fsc = ceph_sb_to_client(sb);
1095 dout("get_sb got existing client %p\n", fsc);
1096 } else {
1097 dout("get_sb using new client %p\n", fsc);
1098 err = ceph_setup_bdi(sb, fsc);
1099 if (err < 0) {
1100 res = ERR_PTR(err);
1101 goto out_splat;
1102 }
1103 }
1104
1105 res = ceph_real_mount(fsc);
1106 if (IS_ERR(res))
1107 goto out_splat;
1108 dout("root %p inode %p ino %llx.%llx\n", res,
1109 d_inode(res), ceph_vinop(d_inode(res)));
1110 return res;
1111
1112 out_splat:
1113 ceph_mdsc_close_sessions(fsc->mdsc);
1114 deactivate_locked_super(sb);
1115 goto out_final;
1116
1117 out:
1118 ceph_mdsc_destroy(fsc);
1119 destroy_fs_client(fsc);
1120 out_final:
1121 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1122 return res;
1123 }
1124
1125 static void ceph_kill_sb(struct super_block *s)
1126 {
1127 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1128 dev_t dev = s->s_dev;
1129
1130 dout("kill_sb %p\n", s);
1131
1132 ceph_mdsc_pre_umount(fsc->mdsc);
1133 flush_fs_workqueues(fsc);
1134
1135 generic_shutdown_super(s);
1136
1137 fsc->client->extra_mon_dispatch = NULL;
1138 ceph_fs_debugfs_cleanup(fsc);
1139
1140 ceph_fscache_unregister_fs(fsc);
1141
1142 ceph_mdsc_destroy(fsc);
1143
1144 destroy_fs_client(fsc);
1145 free_anon_bdev(dev);
1146 }
1147
1148 static struct file_system_type ceph_fs_type = {
1149 .owner = THIS_MODULE,
1150 .name = "ceph",
1151 .mount = ceph_mount,
1152 .kill_sb = ceph_kill_sb,
1153 .fs_flags = FS_RENAME_DOES_D_MOVE,
1154 };
1155 MODULE_ALIAS_FS("ceph");
1156
1157 static int __init init_ceph(void)
1158 {
1159 int ret = init_caches();
1160 if (ret)
1161 goto out;
1162
1163 ceph_flock_init();
1164 ceph_xattr_init();
1165 ret = register_filesystem(&ceph_fs_type);
1166 if (ret)
1167 goto out_xattr;
1168
1169 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1170
1171 return 0;
1172
1173 out_xattr:
1174 ceph_xattr_exit();
1175 destroy_caches();
1176 out:
1177 return ret;
1178 }
1179
1180 static void __exit exit_ceph(void)
1181 {
1182 dout("exit_ceph\n");
1183 unregister_filesystem(&ceph_fs_type);
1184 ceph_xattr_exit();
1185 destroy_caches();
1186 }
1187
1188 module_init(init_ceph);
1189 module_exit(exit_ceph);
1190
1191 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1192 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1193 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1194 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1195 MODULE_LICENSE("GPL");
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