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1 | /* | |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/blkdev.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/pagemap.h> | |
24 | #include <linux/highmem.h> | |
25 | #include <linux/time.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/backing-dev.h> | |
30 | #include <linux/mount.h> | |
31 | #include <linux/mpage.h> | |
32 | #include <linux/swap.h> | |
33 | #include <linux/writeback.h> | |
34 | #include <linux/statfs.h> | |
35 | #include <linux/compat.h> | |
36 | #include <linux/parser.h> | |
37 | #include <linux/ctype.h> | |
38 | #include <linux/namei.h> | |
39 | #include <linux/miscdevice.h> | |
40 | #include <linux/magic.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/cleancache.h> | |
43 | #include <linux/ratelimit.h> | |
44 | #include <linux/btrfs.h> | |
45 | #include "delayed-inode.h" | |
46 | #include "ctree.h" | |
47 | #include "disk-io.h" | |
48 | #include "transaction.h" | |
49 | #include "btrfs_inode.h" | |
50 | #include "print-tree.h" | |
51 | #include "hash.h" | |
52 | #include "props.h" | |
53 | #include "xattr.h" | |
54 | #include "volumes.h" | |
55 | #include "export.h" | |
56 | #include "compression.h" | |
57 | #include "rcu-string.h" | |
58 | #include "dev-replace.h" | |
59 | #include "free-space-cache.h" | |
60 | #include "backref.h" | |
61 | #include "tests/btrfs-tests.h" | |
62 | ||
63 | #include "qgroup.h" | |
64 | #define CREATE_TRACE_POINTS | |
65 | #include <trace/events/btrfs.h> | |
66 | ||
67 | static const struct super_operations btrfs_super_ops; | |
68 | static struct file_system_type btrfs_fs_type; | |
69 | ||
70 | static int btrfs_remount(struct super_block *sb, int *flags, char *data); | |
71 | ||
72 | const char *btrfs_decode_error(int errno) | |
73 | { | |
74 | char *errstr = "unknown"; | |
75 | ||
76 | switch (errno) { | |
77 | case -EIO: | |
78 | errstr = "IO failure"; | |
79 | break; | |
80 | case -ENOMEM: | |
81 | errstr = "Out of memory"; | |
82 | break; | |
83 | case -EROFS: | |
84 | errstr = "Readonly filesystem"; | |
85 | break; | |
86 | case -EEXIST: | |
87 | errstr = "Object already exists"; | |
88 | break; | |
89 | case -ENOSPC: | |
90 | errstr = "No space left"; | |
91 | break; | |
92 | case -ENOENT: | |
93 | errstr = "No such entry"; | |
94 | break; | |
95 | } | |
96 | ||
97 | return errstr; | |
98 | } | |
99 | ||
100 | static void save_error_info(struct btrfs_fs_info *fs_info) | |
101 | { | |
102 | /* | |
103 | * today we only save the error info into ram. Long term we'll | |
104 | * also send it down to the disk | |
105 | */ | |
106 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); | |
107 | } | |
108 | ||
109 | /* btrfs handle error by forcing the filesystem readonly */ | |
110 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) | |
111 | { | |
112 | struct super_block *sb = fs_info->sb; | |
113 | ||
114 | if (sb->s_flags & MS_RDONLY) | |
115 | return; | |
116 | ||
117 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { | |
118 | sb->s_flags |= MS_RDONLY; | |
119 | btrfs_info(fs_info, "forced readonly"); | |
120 | /* | |
121 | * Note that a running device replace operation is not | |
122 | * canceled here although there is no way to update | |
123 | * the progress. It would add the risk of a deadlock, | |
124 | * therefore the canceling is ommited. The only penalty | |
125 | * is that some I/O remains active until the procedure | |
126 | * completes. The next time when the filesystem is | |
127 | * mounted writeable again, the device replace | |
128 | * operation continues. | |
129 | */ | |
130 | } | |
131 | } | |
132 | ||
133 | /* | |
134 | * __btrfs_std_error decodes expected errors from the caller and | |
135 | * invokes the approciate error response. | |
136 | */ | |
137 | __cold | |
138 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
139 | unsigned int line, int errno, const char *fmt, ...) | |
140 | { | |
141 | struct super_block *sb = fs_info->sb; | |
142 | #ifdef CONFIG_PRINTK | |
143 | const char *errstr; | |
144 | #endif | |
145 | ||
146 | /* | |
147 | * Special case: if the error is EROFS, and we're already | |
148 | * under MS_RDONLY, then it is safe here. | |
149 | */ | |
150 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
151 | return; | |
152 | ||
153 | #ifdef CONFIG_PRINTK | |
154 | errstr = btrfs_decode_error(errno); | |
155 | if (fmt) { | |
156 | struct va_format vaf; | |
157 | va_list args; | |
158 | ||
159 | va_start(args, fmt); | |
160 | vaf.fmt = fmt; | |
161 | vaf.va = &args; | |
162 | ||
163 | printk(KERN_CRIT | |
164 | "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", | |
165 | sb->s_id, function, line, errno, errstr, &vaf); | |
166 | va_end(args); | |
167 | } else { | |
168 | printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", | |
169 | sb->s_id, function, line, errno, errstr); | |
170 | } | |
171 | #endif | |
172 | ||
173 | /* Don't go through full error handling during mount */ | |
174 | save_error_info(fs_info); | |
175 | if (sb->s_flags & MS_BORN) | |
176 | btrfs_handle_error(fs_info); | |
177 | } | |
178 | ||
179 | #ifdef CONFIG_PRINTK | |
180 | static const char * const logtypes[] = { | |
181 | "emergency", | |
182 | "alert", | |
183 | "critical", | |
184 | "error", | |
185 | "warning", | |
186 | "notice", | |
187 | "info", | |
188 | "debug", | |
189 | }; | |
190 | ||
191 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) | |
192 | { | |
193 | struct super_block *sb = fs_info->sb; | |
194 | char lvl[4]; | |
195 | struct va_format vaf; | |
196 | va_list args; | |
197 | const char *type = logtypes[4]; | |
198 | int kern_level; | |
199 | ||
200 | va_start(args, fmt); | |
201 | ||
202 | kern_level = printk_get_level(fmt); | |
203 | if (kern_level) { | |
204 | size_t size = printk_skip_level(fmt) - fmt; | |
205 | memcpy(lvl, fmt, size); | |
206 | lvl[size] = '\0'; | |
207 | fmt += size; | |
208 | type = logtypes[kern_level - '0']; | |
209 | } else | |
210 | *lvl = '\0'; | |
211 | ||
212 | vaf.fmt = fmt; | |
213 | vaf.va = &args; | |
214 | ||
215 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); | |
216 | ||
217 | va_end(args); | |
218 | } | |
219 | #endif | |
220 | ||
221 | /* | |
222 | * We only mark the transaction aborted and then set the file system read-only. | |
223 | * This will prevent new transactions from starting or trying to join this | |
224 | * one. | |
225 | * | |
226 | * This means that error recovery at the call site is limited to freeing | |
227 | * any local memory allocations and passing the error code up without | |
228 | * further cleanup. The transaction should complete as it normally would | |
229 | * in the call path but will return -EIO. | |
230 | * | |
231 | * We'll complete the cleanup in btrfs_end_transaction and | |
232 | * btrfs_commit_transaction. | |
233 | */ | |
234 | __cold | |
235 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, | |
236 | struct btrfs_root *root, const char *function, | |
237 | unsigned int line, int errno) | |
238 | { | |
239 | trans->aborted = errno; | |
240 | /* Nothing used. The other threads that have joined this | |
241 | * transaction may be able to continue. */ | |
242 | if (!trans->blocks_used && list_empty(&trans->new_bgs)) { | |
243 | const char *errstr; | |
244 | ||
245 | errstr = btrfs_decode_error(errno); | |
246 | btrfs_warn(root->fs_info, | |
247 | "%s:%d: Aborting unused transaction(%s).", | |
248 | function, line, errstr); | |
249 | return; | |
250 | } | |
251 | ACCESS_ONCE(trans->transaction->aborted) = errno; | |
252 | /* Wake up anybody who may be waiting on this transaction */ | |
253 | wake_up(&root->fs_info->transaction_wait); | |
254 | wake_up(&root->fs_info->transaction_blocked_wait); | |
255 | __btrfs_std_error(root->fs_info, function, line, errno, NULL); | |
256 | } | |
257 | /* | |
258 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
259 | * issues an alert, and either panics or BUGs, depending on mount options. | |
260 | */ | |
261 | __cold | |
262 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, | |
263 | unsigned int line, int errno, const char *fmt, ...) | |
264 | { | |
265 | char *s_id = "<unknown>"; | |
266 | const char *errstr; | |
267 | struct va_format vaf = { .fmt = fmt }; | |
268 | va_list args; | |
269 | ||
270 | if (fs_info) | |
271 | s_id = fs_info->sb->s_id; | |
272 | ||
273 | va_start(args, fmt); | |
274 | vaf.va = &args; | |
275 | ||
276 | errstr = btrfs_decode_error(errno); | |
277 | if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) | |
278 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", | |
279 | s_id, function, line, &vaf, errno, errstr); | |
280 | ||
281 | btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", | |
282 | function, line, &vaf, errno, errstr); | |
283 | va_end(args); | |
284 | /* Caller calls BUG() */ | |
285 | } | |
286 | ||
287 | static void btrfs_put_super(struct super_block *sb) | |
288 | { | |
289 | close_ctree(btrfs_sb(sb)->tree_root); | |
290 | } | |
291 | ||
292 | enum { | |
293 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, | |
294 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, | |
295 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
296 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, | |
297 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
298 | Opt_space_cache, Opt_space_cache_version, Opt_clear_cache, | |
299 | Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid, | |
300 | Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery, | |
301 | Opt_skip_balance, Opt_check_integrity, | |
302 | Opt_check_integrity_including_extent_data, | |
303 | Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, | |
304 | Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, | |
305 | Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, | |
306 | Opt_datasum, Opt_treelog, Opt_noinode_cache, | |
307 | #ifdef CONFIG_BTRFS_DEBUG | |
308 | Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, | |
309 | #endif | |
310 | Opt_err, | |
311 | }; | |
312 | ||
313 | static const match_table_t tokens = { | |
314 | {Opt_degraded, "degraded"}, | |
315 | {Opt_subvol, "subvol=%s"}, | |
316 | {Opt_subvolid, "subvolid=%s"}, | |
317 | {Opt_device, "device=%s"}, | |
318 | {Opt_nodatasum, "nodatasum"}, | |
319 | {Opt_datasum, "datasum"}, | |
320 | {Opt_nodatacow, "nodatacow"}, | |
321 | {Opt_datacow, "datacow"}, | |
322 | {Opt_nobarrier, "nobarrier"}, | |
323 | {Opt_barrier, "barrier"}, | |
324 | {Opt_max_inline, "max_inline=%s"}, | |
325 | {Opt_alloc_start, "alloc_start=%s"}, | |
326 | {Opt_thread_pool, "thread_pool=%d"}, | |
327 | {Opt_compress, "compress"}, | |
328 | {Opt_compress_type, "compress=%s"}, | |
329 | {Opt_compress_force, "compress-force"}, | |
330 | {Opt_compress_force_type, "compress-force=%s"}, | |
331 | {Opt_ssd, "ssd"}, | |
332 | {Opt_ssd_spread, "ssd_spread"}, | |
333 | {Opt_nossd, "nossd"}, | |
334 | {Opt_acl, "acl"}, | |
335 | {Opt_noacl, "noacl"}, | |
336 | {Opt_notreelog, "notreelog"}, | |
337 | {Opt_treelog, "treelog"}, | |
338 | {Opt_flushoncommit, "flushoncommit"}, | |
339 | {Opt_noflushoncommit, "noflushoncommit"}, | |
340 | {Opt_ratio, "metadata_ratio=%d"}, | |
341 | {Opt_discard, "discard"}, | |
342 | {Opt_nodiscard, "nodiscard"}, | |
343 | {Opt_space_cache, "space_cache"}, | |
344 | {Opt_space_cache_version, "space_cache=%s"}, | |
345 | {Opt_clear_cache, "clear_cache"}, | |
346 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, | |
347 | {Opt_enospc_debug, "enospc_debug"}, | |
348 | {Opt_noenospc_debug, "noenospc_debug"}, | |
349 | {Opt_subvolrootid, "subvolrootid=%d"}, | |
350 | {Opt_defrag, "autodefrag"}, | |
351 | {Opt_nodefrag, "noautodefrag"}, | |
352 | {Opt_inode_cache, "inode_cache"}, | |
353 | {Opt_noinode_cache, "noinode_cache"}, | |
354 | {Opt_no_space_cache, "nospace_cache"}, | |
355 | {Opt_recovery, "recovery"}, | |
356 | {Opt_skip_balance, "skip_balance"}, | |
357 | {Opt_check_integrity, "check_int"}, | |
358 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
359 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, | |
360 | {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, | |
361 | {Opt_fatal_errors, "fatal_errors=%s"}, | |
362 | {Opt_commit_interval, "commit=%d"}, | |
363 | #ifdef CONFIG_BTRFS_DEBUG | |
364 | {Opt_fragment_data, "fragment=data"}, | |
365 | {Opt_fragment_metadata, "fragment=metadata"}, | |
366 | {Opt_fragment_all, "fragment=all"}, | |
367 | #endif | |
368 | {Opt_err, NULL}, | |
369 | }; | |
370 | ||
371 | /* | |
372 | * Regular mount options parser. Everything that is needed only when | |
373 | * reading in a new superblock is parsed here. | |
374 | * XXX JDM: This needs to be cleaned up for remount. | |
375 | */ | |
376 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
377 | { | |
378 | struct btrfs_fs_info *info = root->fs_info; | |
379 | substring_t args[MAX_OPT_ARGS]; | |
380 | char *p, *num, *orig = NULL; | |
381 | u64 cache_gen; | |
382 | int intarg; | |
383 | int ret = 0; | |
384 | char *compress_type; | |
385 | bool compress_force = false; | |
386 | enum btrfs_compression_type saved_compress_type; | |
387 | bool saved_compress_force; | |
388 | int no_compress = 0; | |
389 | ||
390 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); | |
391 | if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE)) | |
392 | btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); | |
393 | else if (cache_gen) | |
394 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); | |
395 | ||
396 | if (!options) | |
397 | goto out; | |
398 | ||
399 | /* | |
400 | * strsep changes the string, duplicate it because parse_options | |
401 | * gets called twice | |
402 | */ | |
403 | options = kstrdup(options, GFP_NOFS); | |
404 | if (!options) | |
405 | return -ENOMEM; | |
406 | ||
407 | orig = options; | |
408 | ||
409 | while ((p = strsep(&options, ",")) != NULL) { | |
410 | int token; | |
411 | if (!*p) | |
412 | continue; | |
413 | ||
414 | token = match_token(p, tokens, args); | |
415 | switch (token) { | |
416 | case Opt_degraded: | |
417 | btrfs_info(root->fs_info, "allowing degraded mounts"); | |
418 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
419 | break; | |
420 | case Opt_subvol: | |
421 | case Opt_subvolid: | |
422 | case Opt_subvolrootid: | |
423 | case Opt_device: | |
424 | /* | |
425 | * These are parsed by btrfs_parse_early_options | |
426 | * and can be happily ignored here. | |
427 | */ | |
428 | break; | |
429 | case Opt_nodatasum: | |
430 | btrfs_set_and_info(root, NODATASUM, | |
431 | "setting nodatasum"); | |
432 | break; | |
433 | case Opt_datasum: | |
434 | if (btrfs_test_opt(root, NODATASUM)) { | |
435 | if (btrfs_test_opt(root, NODATACOW)) | |
436 | btrfs_info(root->fs_info, "setting datasum, datacow enabled"); | |
437 | else | |
438 | btrfs_info(root->fs_info, "setting datasum"); | |
439 | } | |
440 | btrfs_clear_opt(info->mount_opt, NODATACOW); | |
441 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
442 | break; | |
443 | case Opt_nodatacow: | |
444 | if (!btrfs_test_opt(root, NODATACOW)) { | |
445 | if (!btrfs_test_opt(root, COMPRESS) || | |
446 | !btrfs_test_opt(root, FORCE_COMPRESS)) { | |
447 | btrfs_info(root->fs_info, | |
448 | "setting nodatacow, compression disabled"); | |
449 | } else { | |
450 | btrfs_info(root->fs_info, "setting nodatacow"); | |
451 | } | |
452 | } | |
453 | btrfs_clear_opt(info->mount_opt, COMPRESS); | |
454 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
455 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
456 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
457 | break; | |
458 | case Opt_datacow: | |
459 | btrfs_clear_and_info(root, NODATACOW, | |
460 | "setting datacow"); | |
461 | break; | |
462 | case Opt_compress_force: | |
463 | case Opt_compress_force_type: | |
464 | compress_force = true; | |
465 | /* Fallthrough */ | |
466 | case Opt_compress: | |
467 | case Opt_compress_type: | |
468 | saved_compress_type = btrfs_test_opt(root, COMPRESS) ? | |
469 | info->compress_type : BTRFS_COMPRESS_NONE; | |
470 | saved_compress_force = | |
471 | btrfs_test_opt(root, FORCE_COMPRESS); | |
472 | if (token == Opt_compress || | |
473 | token == Opt_compress_force || | |
474 | strcmp(args[0].from, "zlib") == 0) { | |
475 | compress_type = "zlib"; | |
476 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
477 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
478 | btrfs_clear_opt(info->mount_opt, NODATACOW); | |
479 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
480 | no_compress = 0; | |
481 | } else if (strcmp(args[0].from, "lzo") == 0) { | |
482 | compress_type = "lzo"; | |
483 | info->compress_type = BTRFS_COMPRESS_LZO; | |
484 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
485 | btrfs_clear_opt(info->mount_opt, NODATACOW); | |
486 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
487 | btrfs_set_fs_incompat(info, COMPRESS_LZO); | |
488 | no_compress = 0; | |
489 | } else if (strncmp(args[0].from, "no", 2) == 0) { | |
490 | compress_type = "no"; | |
491 | btrfs_clear_opt(info->mount_opt, COMPRESS); | |
492 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
493 | compress_force = false; | |
494 | no_compress++; | |
495 | } else { | |
496 | ret = -EINVAL; | |
497 | goto out; | |
498 | } | |
499 | ||
500 | if (compress_force) { | |
501 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
502 | } else { | |
503 | /* | |
504 | * If we remount from compress-force=xxx to | |
505 | * compress=xxx, we need clear FORCE_COMPRESS | |
506 | * flag, otherwise, there is no way for users | |
507 | * to disable forcible compression separately. | |
508 | */ | |
509 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
510 | } | |
511 | if ((btrfs_test_opt(root, COMPRESS) && | |
512 | (info->compress_type != saved_compress_type || | |
513 | compress_force != saved_compress_force)) || | |
514 | (!btrfs_test_opt(root, COMPRESS) && | |
515 | no_compress == 1)) { | |
516 | btrfs_info(root->fs_info, | |
517 | "%s %s compression", | |
518 | (compress_force) ? "force" : "use", | |
519 | compress_type); | |
520 | } | |
521 | compress_force = false; | |
522 | break; | |
523 | case Opt_ssd: | |
524 | btrfs_set_and_info(root, SSD, | |
525 | "use ssd allocation scheme"); | |
526 | break; | |
527 | case Opt_ssd_spread: | |
528 | btrfs_set_and_info(root, SSD_SPREAD, | |
529 | "use spread ssd allocation scheme"); | |
530 | btrfs_set_opt(info->mount_opt, SSD); | |
531 | break; | |
532 | case Opt_nossd: | |
533 | btrfs_set_and_info(root, NOSSD, | |
534 | "not using ssd allocation scheme"); | |
535 | btrfs_clear_opt(info->mount_opt, SSD); | |
536 | break; | |
537 | case Opt_barrier: | |
538 | btrfs_clear_and_info(root, NOBARRIER, | |
539 | "turning on barriers"); | |
540 | break; | |
541 | case Opt_nobarrier: | |
542 | btrfs_set_and_info(root, NOBARRIER, | |
543 | "turning off barriers"); | |
544 | break; | |
545 | case Opt_thread_pool: | |
546 | ret = match_int(&args[0], &intarg); | |
547 | if (ret) { | |
548 | goto out; | |
549 | } else if (intarg > 0) { | |
550 | info->thread_pool_size = intarg; | |
551 | } else { | |
552 | ret = -EINVAL; | |
553 | goto out; | |
554 | } | |
555 | break; | |
556 | case Opt_max_inline: | |
557 | num = match_strdup(&args[0]); | |
558 | if (num) { | |
559 | info->max_inline = memparse(num, NULL); | |
560 | kfree(num); | |
561 | ||
562 | if (info->max_inline) { | |
563 | info->max_inline = min_t(u64, | |
564 | info->max_inline, | |
565 | root->sectorsize); | |
566 | } | |
567 | btrfs_info(root->fs_info, "max_inline at %llu", | |
568 | info->max_inline); | |
569 | } else { | |
570 | ret = -ENOMEM; | |
571 | goto out; | |
572 | } | |
573 | break; | |
574 | case Opt_alloc_start: | |
575 | num = match_strdup(&args[0]); | |
576 | if (num) { | |
577 | mutex_lock(&info->chunk_mutex); | |
578 | info->alloc_start = memparse(num, NULL); | |
579 | mutex_unlock(&info->chunk_mutex); | |
580 | kfree(num); | |
581 | btrfs_info(root->fs_info, "allocations start at %llu", | |
582 | info->alloc_start); | |
583 | } else { | |
584 | ret = -ENOMEM; | |
585 | goto out; | |
586 | } | |
587 | break; | |
588 | case Opt_acl: | |
589 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL | |
590 | root->fs_info->sb->s_flags |= MS_POSIXACL; | |
591 | break; | |
592 | #else | |
593 | btrfs_err(root->fs_info, | |
594 | "support for ACL not compiled in!"); | |
595 | ret = -EINVAL; | |
596 | goto out; | |
597 | #endif | |
598 | case Opt_noacl: | |
599 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
600 | break; | |
601 | case Opt_notreelog: | |
602 | btrfs_set_and_info(root, NOTREELOG, | |
603 | "disabling tree log"); | |
604 | break; | |
605 | case Opt_treelog: | |
606 | btrfs_clear_and_info(root, NOTREELOG, | |
607 | "enabling tree log"); | |
608 | break; | |
609 | case Opt_flushoncommit: | |
610 | btrfs_set_and_info(root, FLUSHONCOMMIT, | |
611 | "turning on flush-on-commit"); | |
612 | break; | |
613 | case Opt_noflushoncommit: | |
614 | btrfs_clear_and_info(root, FLUSHONCOMMIT, | |
615 | "turning off flush-on-commit"); | |
616 | break; | |
617 | case Opt_ratio: | |
618 | ret = match_int(&args[0], &intarg); | |
619 | if (ret) { | |
620 | goto out; | |
621 | } else if (intarg >= 0) { | |
622 | info->metadata_ratio = intarg; | |
623 | btrfs_info(root->fs_info, "metadata ratio %d", | |
624 | info->metadata_ratio); | |
625 | } else { | |
626 | ret = -EINVAL; | |
627 | goto out; | |
628 | } | |
629 | break; | |
630 | case Opt_discard: | |
631 | btrfs_set_and_info(root, DISCARD, | |
632 | "turning on discard"); | |
633 | break; | |
634 | case Opt_nodiscard: | |
635 | btrfs_clear_and_info(root, DISCARD, | |
636 | "turning off discard"); | |
637 | break; | |
638 | case Opt_space_cache: | |
639 | case Opt_space_cache_version: | |
640 | if (token == Opt_space_cache || | |
641 | strcmp(args[0].from, "v1") == 0) { | |
642 | btrfs_clear_opt(root->fs_info->mount_opt, | |
643 | FREE_SPACE_TREE); | |
644 | btrfs_set_and_info(root, SPACE_CACHE, | |
645 | "enabling disk space caching"); | |
646 | } else if (strcmp(args[0].from, "v2") == 0) { | |
647 | btrfs_clear_opt(root->fs_info->mount_opt, | |
648 | SPACE_CACHE); | |
649 | btrfs_set_and_info(root, FREE_SPACE_TREE, | |
650 | "enabling free space tree"); | |
651 | } else { | |
652 | ret = -EINVAL; | |
653 | goto out; | |
654 | } | |
655 | break; | |
656 | case Opt_rescan_uuid_tree: | |
657 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); | |
658 | break; | |
659 | case Opt_no_space_cache: | |
660 | if (btrfs_test_opt(root, SPACE_CACHE)) { | |
661 | btrfs_clear_and_info(root, SPACE_CACHE, | |
662 | "disabling disk space caching"); | |
663 | } | |
664 | if (btrfs_test_opt(root, FREE_SPACE_TREE)) { | |
665 | btrfs_clear_and_info(root, FREE_SPACE_TREE, | |
666 | "disabling free space tree"); | |
667 | } | |
668 | break; | |
669 | case Opt_inode_cache: | |
670 | btrfs_set_pending_and_info(info, INODE_MAP_CACHE, | |
671 | "enabling inode map caching"); | |
672 | break; | |
673 | case Opt_noinode_cache: | |
674 | btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, | |
675 | "disabling inode map caching"); | |
676 | break; | |
677 | case Opt_clear_cache: | |
678 | btrfs_set_and_info(root, CLEAR_CACHE, | |
679 | "force clearing of disk cache"); | |
680 | break; | |
681 | case Opt_user_subvol_rm_allowed: | |
682 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
683 | break; | |
684 | case Opt_enospc_debug: | |
685 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
686 | break; | |
687 | case Opt_noenospc_debug: | |
688 | btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); | |
689 | break; | |
690 | case Opt_defrag: | |
691 | btrfs_set_and_info(root, AUTO_DEFRAG, | |
692 | "enabling auto defrag"); | |
693 | break; | |
694 | case Opt_nodefrag: | |
695 | btrfs_clear_and_info(root, AUTO_DEFRAG, | |
696 | "disabling auto defrag"); | |
697 | break; | |
698 | case Opt_recovery: | |
699 | btrfs_info(root->fs_info, "enabling auto recovery"); | |
700 | btrfs_set_opt(info->mount_opt, RECOVERY); | |
701 | break; | |
702 | case Opt_skip_balance: | |
703 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
704 | break; | |
705 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
706 | case Opt_check_integrity_including_extent_data: | |
707 | btrfs_info(root->fs_info, | |
708 | "enabling check integrity including extent data"); | |
709 | btrfs_set_opt(info->mount_opt, | |
710 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
711 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
712 | break; | |
713 | case Opt_check_integrity: | |
714 | btrfs_info(root->fs_info, "enabling check integrity"); | |
715 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
716 | break; | |
717 | case Opt_check_integrity_print_mask: | |
718 | ret = match_int(&args[0], &intarg); | |
719 | if (ret) { | |
720 | goto out; | |
721 | } else if (intarg >= 0) { | |
722 | info->check_integrity_print_mask = intarg; | |
723 | btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", | |
724 | info->check_integrity_print_mask); | |
725 | } else { | |
726 | ret = -EINVAL; | |
727 | goto out; | |
728 | } | |
729 | break; | |
730 | #else | |
731 | case Opt_check_integrity_including_extent_data: | |
732 | case Opt_check_integrity: | |
733 | case Opt_check_integrity_print_mask: | |
734 | btrfs_err(root->fs_info, | |
735 | "support for check_integrity* not compiled in!"); | |
736 | ret = -EINVAL; | |
737 | goto out; | |
738 | #endif | |
739 | case Opt_fatal_errors: | |
740 | if (strcmp(args[0].from, "panic") == 0) | |
741 | btrfs_set_opt(info->mount_opt, | |
742 | PANIC_ON_FATAL_ERROR); | |
743 | else if (strcmp(args[0].from, "bug") == 0) | |
744 | btrfs_clear_opt(info->mount_opt, | |
745 | PANIC_ON_FATAL_ERROR); | |
746 | else { | |
747 | ret = -EINVAL; | |
748 | goto out; | |
749 | } | |
750 | break; | |
751 | case Opt_commit_interval: | |
752 | intarg = 0; | |
753 | ret = match_int(&args[0], &intarg); | |
754 | if (ret < 0) { | |
755 | btrfs_err(root->fs_info, "invalid commit interval"); | |
756 | ret = -EINVAL; | |
757 | goto out; | |
758 | } | |
759 | if (intarg > 0) { | |
760 | if (intarg > 300) { | |
761 | btrfs_warn(root->fs_info, "excessive commit interval %d", | |
762 | intarg); | |
763 | } | |
764 | info->commit_interval = intarg; | |
765 | } else { | |
766 | btrfs_info(root->fs_info, "using default commit interval %ds", | |
767 | BTRFS_DEFAULT_COMMIT_INTERVAL); | |
768 | info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; | |
769 | } | |
770 | break; | |
771 | #ifdef CONFIG_BTRFS_DEBUG | |
772 | case Opt_fragment_all: | |
773 | btrfs_info(root->fs_info, "fragmenting all space"); | |
774 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); | |
775 | btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); | |
776 | break; | |
777 | case Opt_fragment_metadata: | |
778 | btrfs_info(root->fs_info, "fragmenting metadata"); | |
779 | btrfs_set_opt(info->mount_opt, | |
780 | FRAGMENT_METADATA); | |
781 | break; | |
782 | case Opt_fragment_data: | |
783 | btrfs_info(root->fs_info, "fragmenting data"); | |
784 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); | |
785 | break; | |
786 | #endif | |
787 | case Opt_err: | |
788 | btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); | |
789 | ret = -EINVAL; | |
790 | goto out; | |
791 | default: | |
792 | break; | |
793 | } | |
794 | } | |
795 | out: | |
796 | if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) && | |
797 | !btrfs_test_opt(root, FREE_SPACE_TREE) && | |
798 | !btrfs_test_opt(root, CLEAR_CACHE)) { | |
799 | btrfs_err(root->fs_info, "cannot disable free space tree"); | |
800 | ret = -EINVAL; | |
801 | ||
802 | } | |
803 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) | |
804 | btrfs_info(root->fs_info, "disk space caching is enabled"); | |
805 | if (!ret && btrfs_test_opt(root, FREE_SPACE_TREE)) | |
806 | btrfs_info(root->fs_info, "using free space tree"); | |
807 | kfree(orig); | |
808 | return ret; | |
809 | } | |
810 | ||
811 | /* | |
812 | * Parse mount options that are required early in the mount process. | |
813 | * | |
814 | * All other options will be parsed on much later in the mount process and | |
815 | * only when we need to allocate a new super block. | |
816 | */ | |
817 | static int btrfs_parse_early_options(const char *options, fmode_t flags, | |
818 | void *holder, char **subvol_name, u64 *subvol_objectid, | |
819 | struct btrfs_fs_devices **fs_devices) | |
820 | { | |
821 | substring_t args[MAX_OPT_ARGS]; | |
822 | char *device_name, *opts, *orig, *p; | |
823 | char *num = NULL; | |
824 | int error = 0; | |
825 | ||
826 | if (!options) | |
827 | return 0; | |
828 | ||
829 | /* | |
830 | * strsep changes the string, duplicate it because parse_options | |
831 | * gets called twice | |
832 | */ | |
833 | opts = kstrdup(options, GFP_KERNEL); | |
834 | if (!opts) | |
835 | return -ENOMEM; | |
836 | orig = opts; | |
837 | ||
838 | while ((p = strsep(&opts, ",")) != NULL) { | |
839 | int token; | |
840 | if (!*p) | |
841 | continue; | |
842 | ||
843 | token = match_token(p, tokens, args); | |
844 | switch (token) { | |
845 | case Opt_subvol: | |
846 | kfree(*subvol_name); | |
847 | *subvol_name = match_strdup(&args[0]); | |
848 | if (!*subvol_name) { | |
849 | error = -ENOMEM; | |
850 | goto out; | |
851 | } | |
852 | break; | |
853 | case Opt_subvolid: | |
854 | num = match_strdup(&args[0]); | |
855 | if (num) { | |
856 | *subvol_objectid = memparse(num, NULL); | |
857 | kfree(num); | |
858 | /* we want the original fs_tree */ | |
859 | if (!*subvol_objectid) | |
860 | *subvol_objectid = | |
861 | BTRFS_FS_TREE_OBJECTID; | |
862 | } else { | |
863 | error = -EINVAL; | |
864 | goto out; | |
865 | } | |
866 | break; | |
867 | case Opt_subvolrootid: | |
868 | printk(KERN_WARNING | |
869 | "BTRFS: 'subvolrootid' mount option is deprecated and has " | |
870 | "no effect\n"); | |
871 | break; | |
872 | case Opt_device: | |
873 | device_name = match_strdup(&args[0]); | |
874 | if (!device_name) { | |
875 | error = -ENOMEM; | |
876 | goto out; | |
877 | } | |
878 | error = btrfs_scan_one_device(device_name, | |
879 | flags, holder, fs_devices); | |
880 | kfree(device_name); | |
881 | if (error) | |
882 | goto out; | |
883 | break; | |
884 | default: | |
885 | break; | |
886 | } | |
887 | } | |
888 | ||
889 | out: | |
890 | kfree(orig); | |
891 | return error; | |
892 | } | |
893 | ||
894 | static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, | |
895 | u64 subvol_objectid) | |
896 | { | |
897 | struct btrfs_root *root = fs_info->tree_root; | |
898 | struct btrfs_root *fs_root; | |
899 | struct btrfs_root_ref *root_ref; | |
900 | struct btrfs_inode_ref *inode_ref; | |
901 | struct btrfs_key key; | |
902 | struct btrfs_path *path = NULL; | |
903 | char *name = NULL, *ptr; | |
904 | u64 dirid; | |
905 | int len; | |
906 | int ret; | |
907 | ||
908 | path = btrfs_alloc_path(); | |
909 | if (!path) { | |
910 | ret = -ENOMEM; | |
911 | goto err; | |
912 | } | |
913 | path->leave_spinning = 1; | |
914 | ||
915 | name = kmalloc(PATH_MAX, GFP_NOFS); | |
916 | if (!name) { | |
917 | ret = -ENOMEM; | |
918 | goto err; | |
919 | } | |
920 | ptr = name + PATH_MAX - 1; | |
921 | ptr[0] = '\0'; | |
922 | ||
923 | /* | |
924 | * Walk up the subvolume trees in the tree of tree roots by root | |
925 | * backrefs until we hit the top-level subvolume. | |
926 | */ | |
927 | while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { | |
928 | key.objectid = subvol_objectid; | |
929 | key.type = BTRFS_ROOT_BACKREF_KEY; | |
930 | key.offset = (u64)-1; | |
931 | ||
932 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
933 | if (ret < 0) { | |
934 | goto err; | |
935 | } else if (ret > 0) { | |
936 | ret = btrfs_previous_item(root, path, subvol_objectid, | |
937 | BTRFS_ROOT_BACKREF_KEY); | |
938 | if (ret < 0) { | |
939 | goto err; | |
940 | } else if (ret > 0) { | |
941 | ret = -ENOENT; | |
942 | goto err; | |
943 | } | |
944 | } | |
945 | ||
946 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
947 | subvol_objectid = key.offset; | |
948 | ||
949 | root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
950 | struct btrfs_root_ref); | |
951 | len = btrfs_root_ref_name_len(path->nodes[0], root_ref); | |
952 | ptr -= len + 1; | |
953 | if (ptr < name) { | |
954 | ret = -ENAMETOOLONG; | |
955 | goto err; | |
956 | } | |
957 | read_extent_buffer(path->nodes[0], ptr + 1, | |
958 | (unsigned long)(root_ref + 1), len); | |
959 | ptr[0] = '/'; | |
960 | dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); | |
961 | btrfs_release_path(path); | |
962 | ||
963 | key.objectid = subvol_objectid; | |
964 | key.type = BTRFS_ROOT_ITEM_KEY; | |
965 | key.offset = (u64)-1; | |
966 | fs_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
967 | if (IS_ERR(fs_root)) { | |
968 | ret = PTR_ERR(fs_root); | |
969 | goto err; | |
970 | } | |
971 | ||
972 | /* | |
973 | * Walk up the filesystem tree by inode refs until we hit the | |
974 | * root directory. | |
975 | */ | |
976 | while (dirid != BTRFS_FIRST_FREE_OBJECTID) { | |
977 | key.objectid = dirid; | |
978 | key.type = BTRFS_INODE_REF_KEY; | |
979 | key.offset = (u64)-1; | |
980 | ||
981 | ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); | |
982 | if (ret < 0) { | |
983 | goto err; | |
984 | } else if (ret > 0) { | |
985 | ret = btrfs_previous_item(fs_root, path, dirid, | |
986 | BTRFS_INODE_REF_KEY); | |
987 | if (ret < 0) { | |
988 | goto err; | |
989 | } else if (ret > 0) { | |
990 | ret = -ENOENT; | |
991 | goto err; | |
992 | } | |
993 | } | |
994 | ||
995 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
996 | dirid = key.offset; | |
997 | ||
998 | inode_ref = btrfs_item_ptr(path->nodes[0], | |
999 | path->slots[0], | |
1000 | struct btrfs_inode_ref); | |
1001 | len = btrfs_inode_ref_name_len(path->nodes[0], | |
1002 | inode_ref); | |
1003 | ptr -= len + 1; | |
1004 | if (ptr < name) { | |
1005 | ret = -ENAMETOOLONG; | |
1006 | goto err; | |
1007 | } | |
1008 | read_extent_buffer(path->nodes[0], ptr + 1, | |
1009 | (unsigned long)(inode_ref + 1), len); | |
1010 | ptr[0] = '/'; | |
1011 | btrfs_release_path(path); | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | btrfs_free_path(path); | |
1016 | if (ptr == name + PATH_MAX - 1) { | |
1017 | name[0] = '/'; | |
1018 | name[1] = '\0'; | |
1019 | } else { | |
1020 | memmove(name, ptr, name + PATH_MAX - ptr); | |
1021 | } | |
1022 | return name; | |
1023 | ||
1024 | err: | |
1025 | btrfs_free_path(path); | |
1026 | kfree(name); | |
1027 | return ERR_PTR(ret); | |
1028 | } | |
1029 | ||
1030 | static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) | |
1031 | { | |
1032 | struct btrfs_root *root = fs_info->tree_root; | |
1033 | struct btrfs_dir_item *di; | |
1034 | struct btrfs_path *path; | |
1035 | struct btrfs_key location; | |
1036 | u64 dir_id; | |
1037 | ||
1038 | path = btrfs_alloc_path(); | |
1039 | if (!path) | |
1040 | return -ENOMEM; | |
1041 | path->leave_spinning = 1; | |
1042 | ||
1043 | /* | |
1044 | * Find the "default" dir item which points to the root item that we | |
1045 | * will mount by default if we haven't been given a specific subvolume | |
1046 | * to mount. | |
1047 | */ | |
1048 | dir_id = btrfs_super_root_dir(fs_info->super_copy); | |
1049 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); | |
1050 | if (IS_ERR(di)) { | |
1051 | btrfs_free_path(path); | |
1052 | return PTR_ERR(di); | |
1053 | } | |
1054 | if (!di) { | |
1055 | /* | |
1056 | * Ok the default dir item isn't there. This is weird since | |
1057 | * it's always been there, but don't freak out, just try and | |
1058 | * mount the top-level subvolume. | |
1059 | */ | |
1060 | btrfs_free_path(path); | |
1061 | *objectid = BTRFS_FS_TREE_OBJECTID; | |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
1066 | btrfs_free_path(path); | |
1067 | *objectid = location.objectid; | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | static int btrfs_fill_super(struct super_block *sb, | |
1072 | struct btrfs_fs_devices *fs_devices, | |
1073 | void *data, int silent) | |
1074 | { | |
1075 | struct inode *inode; | |
1076 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); | |
1077 | struct btrfs_key key; | |
1078 | int err; | |
1079 | ||
1080 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1081 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
1082 | sb->s_op = &btrfs_super_ops; | |
1083 | sb->s_d_op = &btrfs_dentry_operations; | |
1084 | sb->s_export_op = &btrfs_export_ops; | |
1085 | sb->s_xattr = btrfs_xattr_handlers; | |
1086 | sb->s_time_gran = 1; | |
1087 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL | |
1088 | sb->s_flags |= MS_POSIXACL; | |
1089 | #endif | |
1090 | sb->s_flags |= MS_I_VERSION; | |
1091 | sb->s_iflags |= SB_I_CGROUPWB; | |
1092 | err = open_ctree(sb, fs_devices, (char *)data); | |
1093 | if (err) { | |
1094 | printk(KERN_ERR "BTRFS: open_ctree failed\n"); | |
1095 | return err; | |
1096 | } | |
1097 | ||
1098 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; | |
1099 | key.type = BTRFS_INODE_ITEM_KEY; | |
1100 | key.offset = 0; | |
1101 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); | |
1102 | if (IS_ERR(inode)) { | |
1103 | err = PTR_ERR(inode); | |
1104 | goto fail_close; | |
1105 | } | |
1106 | ||
1107 | sb->s_root = d_make_root(inode); | |
1108 | if (!sb->s_root) { | |
1109 | err = -ENOMEM; | |
1110 | goto fail_close; | |
1111 | } | |
1112 | ||
1113 | save_mount_options(sb, data); | |
1114 | cleancache_init_fs(sb); | |
1115 | sb->s_flags |= MS_ACTIVE; | |
1116 | return 0; | |
1117 | ||
1118 | fail_close: | |
1119 | close_ctree(fs_info->tree_root); | |
1120 | return err; | |
1121 | } | |
1122 | ||
1123 | int btrfs_sync_fs(struct super_block *sb, int wait) | |
1124 | { | |
1125 | struct btrfs_trans_handle *trans; | |
1126 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); | |
1127 | struct btrfs_root *root = fs_info->tree_root; | |
1128 | ||
1129 | trace_btrfs_sync_fs(wait); | |
1130 | ||
1131 | if (!wait) { | |
1132 | filemap_flush(fs_info->btree_inode->i_mapping); | |
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | btrfs_wait_ordered_roots(fs_info, -1); | |
1137 | ||
1138 | trans = btrfs_attach_transaction_barrier(root); | |
1139 | if (IS_ERR(trans)) { | |
1140 | /* no transaction, don't bother */ | |
1141 | if (PTR_ERR(trans) == -ENOENT) { | |
1142 | /* | |
1143 | * Exit unless we have some pending changes | |
1144 | * that need to go through commit | |
1145 | */ | |
1146 | if (fs_info->pending_changes == 0) | |
1147 | return 0; | |
1148 | /* | |
1149 | * A non-blocking test if the fs is frozen. We must not | |
1150 | * start a new transaction here otherwise a deadlock | |
1151 | * happens. The pending operations are delayed to the | |
1152 | * next commit after thawing. | |
1153 | */ | |
1154 | if (__sb_start_write(sb, SB_FREEZE_WRITE, false)) | |
1155 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1156 | else | |
1157 | return 0; | |
1158 | trans = btrfs_start_transaction(root, 0); | |
1159 | } | |
1160 | if (IS_ERR(trans)) | |
1161 | return PTR_ERR(trans); | |
1162 | } | |
1163 | return btrfs_commit_transaction(trans, root); | |
1164 | } | |
1165 | ||
1166 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) | |
1167 | { | |
1168 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); | |
1169 | struct btrfs_root *root = info->tree_root; | |
1170 | char *compress_type; | |
1171 | ||
1172 | if (btrfs_test_opt(root, DEGRADED)) | |
1173 | seq_puts(seq, ",degraded"); | |
1174 | if (btrfs_test_opt(root, NODATASUM)) | |
1175 | seq_puts(seq, ",nodatasum"); | |
1176 | if (btrfs_test_opt(root, NODATACOW)) | |
1177 | seq_puts(seq, ",nodatacow"); | |
1178 | if (btrfs_test_opt(root, NOBARRIER)) | |
1179 | seq_puts(seq, ",nobarrier"); | |
1180 | if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) | |
1181 | seq_printf(seq, ",max_inline=%llu", info->max_inline); | |
1182 | if (info->alloc_start != 0) | |
1183 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); | |
1184 | if (info->thread_pool_size != min_t(unsigned long, | |
1185 | num_online_cpus() + 2, 8)) | |
1186 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
1187 | if (btrfs_test_opt(root, COMPRESS)) { | |
1188 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) | |
1189 | compress_type = "zlib"; | |
1190 | else | |
1191 | compress_type = "lzo"; | |
1192 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
1193 | seq_printf(seq, ",compress-force=%s", compress_type); | |
1194 | else | |
1195 | seq_printf(seq, ",compress=%s", compress_type); | |
1196 | } | |
1197 | if (btrfs_test_opt(root, NOSSD)) | |
1198 | seq_puts(seq, ",nossd"); | |
1199 | if (btrfs_test_opt(root, SSD_SPREAD)) | |
1200 | seq_puts(seq, ",ssd_spread"); | |
1201 | else if (btrfs_test_opt(root, SSD)) | |
1202 | seq_puts(seq, ",ssd"); | |
1203 | if (btrfs_test_opt(root, NOTREELOG)) | |
1204 | seq_puts(seq, ",notreelog"); | |
1205 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) | |
1206 | seq_puts(seq, ",flushoncommit"); | |
1207 | if (btrfs_test_opt(root, DISCARD)) | |
1208 | seq_puts(seq, ",discard"); | |
1209 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) | |
1210 | seq_puts(seq, ",noacl"); | |
1211 | if (btrfs_test_opt(root, SPACE_CACHE)) | |
1212 | seq_puts(seq, ",space_cache"); | |
1213 | else if (btrfs_test_opt(root, FREE_SPACE_TREE)) | |
1214 | seq_puts(seq, ",space_cache=v2"); | |
1215 | else | |
1216 | seq_puts(seq, ",nospace_cache"); | |
1217 | if (btrfs_test_opt(root, RESCAN_UUID_TREE)) | |
1218 | seq_puts(seq, ",rescan_uuid_tree"); | |
1219 | if (btrfs_test_opt(root, CLEAR_CACHE)) | |
1220 | seq_puts(seq, ",clear_cache"); | |
1221 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
1222 | seq_puts(seq, ",user_subvol_rm_allowed"); | |
1223 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) | |
1224 | seq_puts(seq, ",enospc_debug"); | |
1225 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
1226 | seq_puts(seq, ",autodefrag"); | |
1227 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) | |
1228 | seq_puts(seq, ",inode_cache"); | |
1229 | if (btrfs_test_opt(root, SKIP_BALANCE)) | |
1230 | seq_puts(seq, ",skip_balance"); | |
1231 | if (btrfs_test_opt(root, RECOVERY)) | |
1232 | seq_puts(seq, ",recovery"); | |
1233 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
1234 | if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) | |
1235 | seq_puts(seq, ",check_int_data"); | |
1236 | else if (btrfs_test_opt(root, CHECK_INTEGRITY)) | |
1237 | seq_puts(seq, ",check_int"); | |
1238 | if (info->check_integrity_print_mask) | |
1239 | seq_printf(seq, ",check_int_print_mask=%d", | |
1240 | info->check_integrity_print_mask); | |
1241 | #endif | |
1242 | if (info->metadata_ratio) | |
1243 | seq_printf(seq, ",metadata_ratio=%d", | |
1244 | info->metadata_ratio); | |
1245 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) | |
1246 | seq_puts(seq, ",fatal_errors=panic"); | |
1247 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) | |
1248 | seq_printf(seq, ",commit=%d", info->commit_interval); | |
1249 | #ifdef CONFIG_BTRFS_DEBUG | |
1250 | if (btrfs_test_opt(root, FRAGMENT_DATA)) | |
1251 | seq_puts(seq, ",fragment=data"); | |
1252 | if (btrfs_test_opt(root, FRAGMENT_METADATA)) | |
1253 | seq_puts(seq, ",fragment=metadata"); | |
1254 | #endif | |
1255 | seq_printf(seq, ",subvolid=%llu", | |
1256 | BTRFS_I(d_inode(dentry))->root->root_key.objectid); | |
1257 | seq_puts(seq, ",subvol="); | |
1258 | seq_dentry(seq, dentry, " \t\n\\"); | |
1259 | return 0; | |
1260 | } | |
1261 | ||
1262 | static int btrfs_test_super(struct super_block *s, void *data) | |
1263 | { | |
1264 | struct btrfs_fs_info *p = data; | |
1265 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
1266 | ||
1267 | return fs_info->fs_devices == p->fs_devices; | |
1268 | } | |
1269 | ||
1270 | static int btrfs_set_super(struct super_block *s, void *data) | |
1271 | { | |
1272 | int err = set_anon_super(s, data); | |
1273 | if (!err) | |
1274 | s->s_fs_info = data; | |
1275 | return err; | |
1276 | } | |
1277 | ||
1278 | /* | |
1279 | * subvolumes are identified by ino 256 | |
1280 | */ | |
1281 | static inline int is_subvolume_inode(struct inode *inode) | |
1282 | { | |
1283 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1284 | return 1; | |
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | /* | |
1289 | * This will add subvolid=0 to the argument string while removing any subvol= | |
1290 | * and subvolid= arguments to make sure we get the top-level root for path | |
1291 | * walking to the subvol we want. | |
1292 | */ | |
1293 | static char *setup_root_args(char *args) | |
1294 | { | |
1295 | char *buf, *dst, *sep; | |
1296 | ||
1297 | if (!args) | |
1298 | return kstrdup("subvolid=0", GFP_NOFS); | |
1299 | ||
1300 | /* The worst case is that we add ",subvolid=0" to the end. */ | |
1301 | buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS); | |
1302 | if (!buf) | |
1303 | return NULL; | |
1304 | ||
1305 | while (1) { | |
1306 | sep = strchrnul(args, ','); | |
1307 | if (!strstarts(args, "subvol=") && | |
1308 | !strstarts(args, "subvolid=")) { | |
1309 | memcpy(dst, args, sep - args); | |
1310 | dst += sep - args; | |
1311 | *dst++ = ','; | |
1312 | } | |
1313 | if (*sep) | |
1314 | args = sep + 1; | |
1315 | else | |
1316 | break; | |
1317 | } | |
1318 | strcpy(dst, "subvolid=0"); | |
1319 | ||
1320 | return buf; | |
1321 | } | |
1322 | ||
1323 | static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, | |
1324 | int flags, const char *device_name, | |
1325 | char *data) | |
1326 | { | |
1327 | struct dentry *root; | |
1328 | struct vfsmount *mnt = NULL; | |
1329 | char *newargs; | |
1330 | int ret; | |
1331 | ||
1332 | newargs = setup_root_args(data); | |
1333 | if (!newargs) { | |
1334 | root = ERR_PTR(-ENOMEM); | |
1335 | goto out; | |
1336 | } | |
1337 | ||
1338 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); | |
1339 | if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { | |
1340 | if (flags & MS_RDONLY) { | |
1341 | mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, | |
1342 | device_name, newargs); | |
1343 | } else { | |
1344 | mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, | |
1345 | device_name, newargs); | |
1346 | if (IS_ERR(mnt)) { | |
1347 | root = ERR_CAST(mnt); | |
1348 | mnt = NULL; | |
1349 | goto out; | |
1350 | } | |
1351 | ||
1352 | down_write(&mnt->mnt_sb->s_umount); | |
1353 | ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); | |
1354 | up_write(&mnt->mnt_sb->s_umount); | |
1355 | if (ret < 0) { | |
1356 | root = ERR_PTR(ret); | |
1357 | goto out; | |
1358 | } | |
1359 | } | |
1360 | } | |
1361 | if (IS_ERR(mnt)) { | |
1362 | root = ERR_CAST(mnt); | |
1363 | mnt = NULL; | |
1364 | goto out; | |
1365 | } | |
1366 | ||
1367 | if (!subvol_name) { | |
1368 | if (!subvol_objectid) { | |
1369 | ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), | |
1370 | &subvol_objectid); | |
1371 | if (ret) { | |
1372 | root = ERR_PTR(ret); | |
1373 | goto out; | |
1374 | } | |
1375 | } | |
1376 | subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), | |
1377 | subvol_objectid); | |
1378 | if (IS_ERR(subvol_name)) { | |
1379 | root = ERR_CAST(subvol_name); | |
1380 | subvol_name = NULL; | |
1381 | goto out; | |
1382 | } | |
1383 | ||
1384 | } | |
1385 | ||
1386 | root = mount_subtree(mnt, subvol_name); | |
1387 | /* mount_subtree() drops our reference on the vfsmount. */ | |
1388 | mnt = NULL; | |
1389 | ||
1390 | if (!IS_ERR(root)) { | |
1391 | struct super_block *s = root->d_sb; | |
1392 | struct inode *root_inode = d_inode(root); | |
1393 | u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; | |
1394 | ||
1395 | ret = 0; | |
1396 | if (!is_subvolume_inode(root_inode)) { | |
1397 | pr_err("BTRFS: '%s' is not a valid subvolume\n", | |
1398 | subvol_name); | |
1399 | ret = -EINVAL; | |
1400 | } | |
1401 | if (subvol_objectid && root_objectid != subvol_objectid) { | |
1402 | /* | |
1403 | * This will also catch a race condition where a | |
1404 | * subvolume which was passed by ID is renamed and | |
1405 | * another subvolume is renamed over the old location. | |
1406 | */ | |
1407 | pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n", | |
1408 | subvol_name, subvol_objectid); | |
1409 | ret = -EINVAL; | |
1410 | } | |
1411 | if (ret) { | |
1412 | dput(root); | |
1413 | root = ERR_PTR(ret); | |
1414 | deactivate_locked_super(s); | |
1415 | } | |
1416 | } | |
1417 | ||
1418 | out: | |
1419 | mntput(mnt); | |
1420 | kfree(newargs); | |
1421 | kfree(subvol_name); | |
1422 | return root; | |
1423 | } | |
1424 | ||
1425 | static int parse_security_options(char *orig_opts, | |
1426 | struct security_mnt_opts *sec_opts) | |
1427 | { | |
1428 | char *secdata = NULL; | |
1429 | int ret = 0; | |
1430 | ||
1431 | secdata = alloc_secdata(); | |
1432 | if (!secdata) | |
1433 | return -ENOMEM; | |
1434 | ret = security_sb_copy_data(orig_opts, secdata); | |
1435 | if (ret) { | |
1436 | free_secdata(secdata); | |
1437 | return ret; | |
1438 | } | |
1439 | ret = security_sb_parse_opts_str(secdata, sec_opts); | |
1440 | free_secdata(secdata); | |
1441 | return ret; | |
1442 | } | |
1443 | ||
1444 | static int setup_security_options(struct btrfs_fs_info *fs_info, | |
1445 | struct super_block *sb, | |
1446 | struct security_mnt_opts *sec_opts) | |
1447 | { | |
1448 | int ret = 0; | |
1449 | ||
1450 | /* | |
1451 | * Call security_sb_set_mnt_opts() to check whether new sec_opts | |
1452 | * is valid. | |
1453 | */ | |
1454 | ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); | |
1455 | if (ret) | |
1456 | return ret; | |
1457 | ||
1458 | #ifdef CONFIG_SECURITY | |
1459 | if (!fs_info->security_opts.num_mnt_opts) { | |
1460 | /* first time security setup, copy sec_opts to fs_info */ | |
1461 | memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); | |
1462 | } else { | |
1463 | /* | |
1464 | * Since SELinux(the only one supports security_mnt_opts) does | |
1465 | * NOT support changing context during remount/mount same sb, | |
1466 | * This must be the same or part of the same security options, | |
1467 | * just free it. | |
1468 | */ | |
1469 | security_free_mnt_opts(sec_opts); | |
1470 | } | |
1471 | #endif | |
1472 | return ret; | |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * Find a superblock for the given device / mount point. | |
1477 | * | |
1478 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1479 | * for multiple device setup. Make sure to keep it in sync. | |
1480 | */ | |
1481 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, | |
1482 | const char *device_name, void *data) | |
1483 | { | |
1484 | struct block_device *bdev = NULL; | |
1485 | struct super_block *s; | |
1486 | struct btrfs_fs_devices *fs_devices = NULL; | |
1487 | struct btrfs_fs_info *fs_info = NULL; | |
1488 | struct security_mnt_opts new_sec_opts; | |
1489 | fmode_t mode = FMODE_READ; | |
1490 | char *subvol_name = NULL; | |
1491 | u64 subvol_objectid = 0; | |
1492 | int error = 0; | |
1493 | ||
1494 | if (!(flags & MS_RDONLY)) | |
1495 | mode |= FMODE_WRITE; | |
1496 | ||
1497 | error = btrfs_parse_early_options(data, mode, fs_type, | |
1498 | &subvol_name, &subvol_objectid, | |
1499 | &fs_devices); | |
1500 | if (error) { | |
1501 | kfree(subvol_name); | |
1502 | return ERR_PTR(error); | |
1503 | } | |
1504 | ||
1505 | if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { | |
1506 | /* mount_subvol() will free subvol_name. */ | |
1507 | return mount_subvol(subvol_name, subvol_objectid, flags, | |
1508 | device_name, data); | |
1509 | } | |
1510 | ||
1511 | security_init_mnt_opts(&new_sec_opts); | |
1512 | if (data) { | |
1513 | error = parse_security_options(data, &new_sec_opts); | |
1514 | if (error) | |
1515 | return ERR_PTR(error); | |
1516 | } | |
1517 | ||
1518 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); | |
1519 | if (error) | |
1520 | goto error_sec_opts; | |
1521 | ||
1522 | /* | |
1523 | * Setup a dummy root and fs_info for test/set super. This is because | |
1524 | * we don't actually fill this stuff out until open_ctree, but we need | |
1525 | * it for searching for existing supers, so this lets us do that and | |
1526 | * then open_ctree will properly initialize everything later. | |
1527 | */ | |
1528 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
1529 | if (!fs_info) { | |
1530 | error = -ENOMEM; | |
1531 | goto error_sec_opts; | |
1532 | } | |
1533 | ||
1534 | fs_info->fs_devices = fs_devices; | |
1535 | ||
1536 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
1537 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
1538 | security_init_mnt_opts(&fs_info->security_opts); | |
1539 | if (!fs_info->super_copy || !fs_info->super_for_commit) { | |
1540 | error = -ENOMEM; | |
1541 | goto error_fs_info; | |
1542 | } | |
1543 | ||
1544 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1545 | if (error) | |
1546 | goto error_fs_info; | |
1547 | ||
1548 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1549 | error = -EACCES; | |
1550 | goto error_close_devices; | |
1551 | } | |
1552 | ||
1553 | bdev = fs_devices->latest_bdev; | |
1554 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, | |
1555 | fs_info); | |
1556 | if (IS_ERR(s)) { | |
1557 | error = PTR_ERR(s); | |
1558 | goto error_close_devices; | |
1559 | } | |
1560 | ||
1561 | if (s->s_root) { | |
1562 | btrfs_close_devices(fs_devices); | |
1563 | free_fs_info(fs_info); | |
1564 | if ((flags ^ s->s_flags) & MS_RDONLY) | |
1565 | error = -EBUSY; | |
1566 | } else { | |
1567 | snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); | |
1568 | btrfs_sb(s)->bdev_holder = fs_type; | |
1569 | error = btrfs_fill_super(s, fs_devices, data, | |
1570 | flags & MS_SILENT ? 1 : 0); | |
1571 | } | |
1572 | if (error) { | |
1573 | deactivate_locked_super(s); | |
1574 | goto error_sec_opts; | |
1575 | } | |
1576 | ||
1577 | fs_info = btrfs_sb(s); | |
1578 | error = setup_security_options(fs_info, s, &new_sec_opts); | |
1579 | if (error) { | |
1580 | deactivate_locked_super(s); | |
1581 | goto error_sec_opts; | |
1582 | } | |
1583 | ||
1584 | return dget(s->s_root); | |
1585 | ||
1586 | error_close_devices: | |
1587 | btrfs_close_devices(fs_devices); | |
1588 | error_fs_info: | |
1589 | free_fs_info(fs_info); | |
1590 | error_sec_opts: | |
1591 | security_free_mnt_opts(&new_sec_opts); | |
1592 | return ERR_PTR(error); | |
1593 | } | |
1594 | ||
1595 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, | |
1596 | int new_pool_size, int old_pool_size) | |
1597 | { | |
1598 | if (new_pool_size == old_pool_size) | |
1599 | return; | |
1600 | ||
1601 | fs_info->thread_pool_size = new_pool_size; | |
1602 | ||
1603 | btrfs_info(fs_info, "resize thread pool %d -> %d", | |
1604 | old_pool_size, new_pool_size); | |
1605 | ||
1606 | btrfs_workqueue_set_max(fs_info->workers, new_pool_size); | |
1607 | btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); | |
1608 | btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); | |
1609 | btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); | |
1610 | btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); | |
1611 | btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); | |
1612 | btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, | |
1613 | new_pool_size); | |
1614 | btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); | |
1615 | btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); | |
1616 | btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); | |
1617 | btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); | |
1618 | btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, | |
1619 | new_pool_size); | |
1620 | } | |
1621 | ||
1622 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) | |
1623 | { | |
1624 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1625 | } | |
1626 | ||
1627 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, | |
1628 | unsigned long old_opts, int flags) | |
1629 | { | |
1630 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1631 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1632 | (flags & MS_RDONLY))) { | |
1633 | /* wait for any defraggers to finish */ | |
1634 | wait_event(fs_info->transaction_wait, | |
1635 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1636 | if (flags & MS_RDONLY) | |
1637 | sync_filesystem(fs_info->sb); | |
1638 | } | |
1639 | } | |
1640 | ||
1641 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1642 | unsigned long old_opts) | |
1643 | { | |
1644 | /* | |
1645 | * We need cleanup all defragable inodes if the autodefragment is | |
1646 | * close or the fs is R/O. | |
1647 | */ | |
1648 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1649 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1650 | (fs_info->sb->s_flags & MS_RDONLY))) { | |
1651 | btrfs_cleanup_defrag_inodes(fs_info); | |
1652 | } | |
1653 | ||
1654 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1655 | } | |
1656 | ||
1657 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) | |
1658 | { | |
1659 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); | |
1660 | struct btrfs_root *root = fs_info->tree_root; | |
1661 | unsigned old_flags = sb->s_flags; | |
1662 | unsigned long old_opts = fs_info->mount_opt; | |
1663 | unsigned long old_compress_type = fs_info->compress_type; | |
1664 | u64 old_max_inline = fs_info->max_inline; | |
1665 | u64 old_alloc_start = fs_info->alloc_start; | |
1666 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1667 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
1668 | int ret; | |
1669 | ||
1670 | sync_filesystem(sb); | |
1671 | btrfs_remount_prepare(fs_info); | |
1672 | ||
1673 | if (data) { | |
1674 | struct security_mnt_opts new_sec_opts; | |
1675 | ||
1676 | security_init_mnt_opts(&new_sec_opts); | |
1677 | ret = parse_security_options(data, &new_sec_opts); | |
1678 | if (ret) | |
1679 | goto restore; | |
1680 | ret = setup_security_options(fs_info, sb, | |
1681 | &new_sec_opts); | |
1682 | if (ret) { | |
1683 | security_free_mnt_opts(&new_sec_opts); | |
1684 | goto restore; | |
1685 | } | |
1686 | } | |
1687 | ||
1688 | ret = btrfs_parse_options(root, data); | |
1689 | if (ret) { | |
1690 | ret = -EINVAL; | |
1691 | goto restore; | |
1692 | } | |
1693 | ||
1694 | btrfs_remount_begin(fs_info, old_opts, *flags); | |
1695 | btrfs_resize_thread_pool(fs_info, | |
1696 | fs_info->thread_pool_size, old_thread_pool_size); | |
1697 | ||
1698 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) | |
1699 | goto out; | |
1700 | ||
1701 | if (*flags & MS_RDONLY) { | |
1702 | /* | |
1703 | * this also happens on 'umount -rf' or on shutdown, when | |
1704 | * the filesystem is busy. | |
1705 | */ | |
1706 | cancel_work_sync(&fs_info->async_reclaim_work); | |
1707 | ||
1708 | /* wait for the uuid_scan task to finish */ | |
1709 | down(&fs_info->uuid_tree_rescan_sem); | |
1710 | /* avoid complains from lockdep et al. */ | |
1711 | up(&fs_info->uuid_tree_rescan_sem); | |
1712 | ||
1713 | sb->s_flags |= MS_RDONLY; | |
1714 | ||
1715 | /* | |
1716 | * Setting MS_RDONLY will put the cleaner thread to | |
1717 | * sleep at the next loop if it's already active. | |
1718 | * If it's already asleep, we'll leave unused block | |
1719 | * groups on disk until we're mounted read-write again | |
1720 | * unless we clean them up here. | |
1721 | */ | |
1722 | btrfs_delete_unused_bgs(fs_info); | |
1723 | ||
1724 | btrfs_dev_replace_suspend_for_unmount(fs_info); | |
1725 | btrfs_scrub_cancel(fs_info); | |
1726 | btrfs_pause_balance(fs_info); | |
1727 | ||
1728 | ret = btrfs_commit_super(root); | |
1729 | if (ret) | |
1730 | goto restore; | |
1731 | } else { | |
1732 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { | |
1733 | btrfs_err(fs_info, | |
1734 | "Remounting read-write after error is not allowed"); | |
1735 | ret = -EINVAL; | |
1736 | goto restore; | |
1737 | } | |
1738 | if (fs_info->fs_devices->rw_devices == 0) { | |
1739 | ret = -EACCES; | |
1740 | goto restore; | |
1741 | } | |
1742 | ||
1743 | if (fs_info->fs_devices->missing_devices > | |
1744 | fs_info->num_tolerated_disk_barrier_failures && | |
1745 | !(*flags & MS_RDONLY)) { | |
1746 | btrfs_warn(fs_info, | |
1747 | "too many missing devices, writeable remount is not allowed"); | |
1748 | ret = -EACCES; | |
1749 | goto restore; | |
1750 | } | |
1751 | ||
1752 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { | |
1753 | ret = -EINVAL; | |
1754 | goto restore; | |
1755 | } | |
1756 | ||
1757 | ret = btrfs_cleanup_fs_roots(fs_info); | |
1758 | if (ret) | |
1759 | goto restore; | |
1760 | ||
1761 | /* recover relocation */ | |
1762 | mutex_lock(&fs_info->cleaner_mutex); | |
1763 | ret = btrfs_recover_relocation(root); | |
1764 | mutex_unlock(&fs_info->cleaner_mutex); | |
1765 | if (ret) | |
1766 | goto restore; | |
1767 | ||
1768 | ret = btrfs_resume_balance_async(fs_info); | |
1769 | if (ret) | |
1770 | goto restore; | |
1771 | ||
1772 | ret = btrfs_resume_dev_replace_async(fs_info); | |
1773 | if (ret) { | |
1774 | btrfs_warn(fs_info, "failed to resume dev_replace"); | |
1775 | goto restore; | |
1776 | } | |
1777 | ||
1778 | if (!fs_info->uuid_root) { | |
1779 | btrfs_info(fs_info, "creating UUID tree"); | |
1780 | ret = btrfs_create_uuid_tree(fs_info); | |
1781 | if (ret) { | |
1782 | btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); | |
1783 | goto restore; | |
1784 | } | |
1785 | } | |
1786 | sb->s_flags &= ~MS_RDONLY; | |
1787 | } | |
1788 | out: | |
1789 | wake_up_process(fs_info->transaction_kthread); | |
1790 | btrfs_remount_cleanup(fs_info, old_opts); | |
1791 | return 0; | |
1792 | ||
1793 | restore: | |
1794 | /* We've hit an error - don't reset MS_RDONLY */ | |
1795 | if (sb->s_flags & MS_RDONLY) | |
1796 | old_flags |= MS_RDONLY; | |
1797 | sb->s_flags = old_flags; | |
1798 | fs_info->mount_opt = old_opts; | |
1799 | fs_info->compress_type = old_compress_type; | |
1800 | fs_info->max_inline = old_max_inline; | |
1801 | mutex_lock(&fs_info->chunk_mutex); | |
1802 | fs_info->alloc_start = old_alloc_start; | |
1803 | mutex_unlock(&fs_info->chunk_mutex); | |
1804 | btrfs_resize_thread_pool(fs_info, | |
1805 | old_thread_pool_size, fs_info->thread_pool_size); | |
1806 | fs_info->metadata_ratio = old_metadata_ratio; | |
1807 | btrfs_remount_cleanup(fs_info, old_opts); | |
1808 | return ret; | |
1809 | } | |
1810 | ||
1811 | /* Used to sort the devices by max_avail(descending sort) */ | |
1812 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1813 | const void *dev_info2) | |
1814 | { | |
1815 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1816 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1817 | return -1; | |
1818 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1819 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1820 | return 1; | |
1821 | else | |
1822 | return 0; | |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * sort the devices by max_avail, in which max free extent size of each device | |
1827 | * is stored.(Descending Sort) | |
1828 | */ | |
1829 | static inline void btrfs_descending_sort_devices( | |
1830 | struct btrfs_device_info *devices, | |
1831 | size_t nr_devices) | |
1832 | { | |
1833 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1834 | btrfs_cmp_device_free_bytes, NULL); | |
1835 | } | |
1836 | ||
1837 | /* | |
1838 | * The helper to calc the free space on the devices that can be used to store | |
1839 | * file data. | |
1840 | */ | |
1841 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1842 | { | |
1843 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1844 | struct btrfs_device_info *devices_info; | |
1845 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1846 | struct btrfs_device *device; | |
1847 | u64 skip_space; | |
1848 | u64 type; | |
1849 | u64 avail_space; | |
1850 | u64 used_space; | |
1851 | u64 min_stripe_size; | |
1852 | int min_stripes = 1, num_stripes = 1; | |
1853 | int i = 0, nr_devices; | |
1854 | int ret; | |
1855 | ||
1856 | /* | |
1857 | * We aren't under the device list lock, so this is racey-ish, but good | |
1858 | * enough for our purposes. | |
1859 | */ | |
1860 | nr_devices = fs_info->fs_devices->open_devices; | |
1861 | if (!nr_devices) { | |
1862 | smp_mb(); | |
1863 | nr_devices = fs_info->fs_devices->open_devices; | |
1864 | ASSERT(nr_devices); | |
1865 | if (!nr_devices) { | |
1866 | *free_bytes = 0; | |
1867 | return 0; | |
1868 | } | |
1869 | } | |
1870 | ||
1871 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), | |
1872 | GFP_NOFS); | |
1873 | if (!devices_info) | |
1874 | return -ENOMEM; | |
1875 | ||
1876 | /* calc min stripe number for data space alloction */ | |
1877 | type = btrfs_get_alloc_profile(root, 1); | |
1878 | if (type & BTRFS_BLOCK_GROUP_RAID0) { | |
1879 | min_stripes = 2; | |
1880 | num_stripes = nr_devices; | |
1881 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
1882 | min_stripes = 2; | |
1883 | num_stripes = 2; | |
1884 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
1885 | min_stripes = 4; | |
1886 | num_stripes = 4; | |
1887 | } | |
1888 | ||
1889 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1890 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1891 | else | |
1892 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1893 | ||
1894 | if (fs_info->alloc_start) | |
1895 | mutex_lock(&fs_devices->device_list_mutex); | |
1896 | rcu_read_lock(); | |
1897 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { | |
1898 | if (!device->in_fs_metadata || !device->bdev || | |
1899 | device->is_tgtdev_for_dev_replace) | |
1900 | continue; | |
1901 | ||
1902 | if (i >= nr_devices) | |
1903 | break; | |
1904 | ||
1905 | avail_space = device->total_bytes - device->bytes_used; | |
1906 | ||
1907 | /* align with stripe_len */ | |
1908 | avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); | |
1909 | avail_space *= BTRFS_STRIPE_LEN; | |
1910 | ||
1911 | /* | |
1912 | * In order to avoid overwritting the superblock on the drive, | |
1913 | * btrfs starts at an offset of at least 1MB when doing chunk | |
1914 | * allocation. | |
1915 | */ | |
1916 | skip_space = SZ_1M; | |
1917 | ||
1918 | /* user can set the offset in fs_info->alloc_start. */ | |
1919 | if (fs_info->alloc_start && | |
1920 | fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1921 | device->total_bytes) { | |
1922 | rcu_read_unlock(); | |
1923 | skip_space = max(fs_info->alloc_start, skip_space); | |
1924 | ||
1925 | /* | |
1926 | * btrfs can not use the free space in | |
1927 | * [0, skip_space - 1], we must subtract it from the | |
1928 | * total. In order to implement it, we account the used | |
1929 | * space in this range first. | |
1930 | */ | |
1931 | ret = btrfs_account_dev_extents_size(device, 0, | |
1932 | skip_space - 1, | |
1933 | &used_space); | |
1934 | if (ret) { | |
1935 | kfree(devices_info); | |
1936 | mutex_unlock(&fs_devices->device_list_mutex); | |
1937 | return ret; | |
1938 | } | |
1939 | ||
1940 | rcu_read_lock(); | |
1941 | ||
1942 | /* calc the free space in [0, skip_space - 1] */ | |
1943 | skip_space -= used_space; | |
1944 | } | |
1945 | ||
1946 | /* | |
1947 | * we can use the free space in [0, skip_space - 1], subtract | |
1948 | * it from the total. | |
1949 | */ | |
1950 | if (avail_space && avail_space >= skip_space) | |
1951 | avail_space -= skip_space; | |
1952 | else | |
1953 | avail_space = 0; | |
1954 | ||
1955 | if (avail_space < min_stripe_size) | |
1956 | continue; | |
1957 | ||
1958 | devices_info[i].dev = device; | |
1959 | devices_info[i].max_avail = avail_space; | |
1960 | ||
1961 | i++; | |
1962 | } | |
1963 | rcu_read_unlock(); | |
1964 | if (fs_info->alloc_start) | |
1965 | mutex_unlock(&fs_devices->device_list_mutex); | |
1966 | ||
1967 | nr_devices = i; | |
1968 | ||
1969 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1970 | ||
1971 | i = nr_devices - 1; | |
1972 | avail_space = 0; | |
1973 | while (nr_devices >= min_stripes) { | |
1974 | if (num_stripes > nr_devices) | |
1975 | num_stripes = nr_devices; | |
1976 | ||
1977 | if (devices_info[i].max_avail >= min_stripe_size) { | |
1978 | int j; | |
1979 | u64 alloc_size; | |
1980 | ||
1981 | avail_space += devices_info[i].max_avail * num_stripes; | |
1982 | alloc_size = devices_info[i].max_avail; | |
1983 | for (j = i + 1 - num_stripes; j <= i; j++) | |
1984 | devices_info[j].max_avail -= alloc_size; | |
1985 | } | |
1986 | i--; | |
1987 | nr_devices--; | |
1988 | } | |
1989 | ||
1990 | kfree(devices_info); | |
1991 | *free_bytes = avail_space; | |
1992 | return 0; | |
1993 | } | |
1994 | ||
1995 | /* | |
1996 | * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. | |
1997 | * | |
1998 | * If there's a redundant raid level at DATA block groups, use the respective | |
1999 | * multiplier to scale the sizes. | |
2000 | * | |
2001 | * Unused device space usage is based on simulating the chunk allocator | |
2002 | * algorithm that respects the device sizes, order of allocations and the | |
2003 | * 'alloc_start' value, this is a close approximation of the actual use but | |
2004 | * there are other factors that may change the result (like a new metadata | |
2005 | * chunk). | |
2006 | * | |
2007 | * If metadata is exhausted, f_bavail will be 0. | |
2008 | * | |
2009 | * FIXME: not accurate for mixed block groups, total and free/used are ok, | |
2010 | * available appears slightly larger. | |
2011 | */ | |
2012 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
2013 | { | |
2014 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); | |
2015 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
2016 | struct list_head *head = &fs_info->space_info; | |
2017 | struct btrfs_space_info *found; | |
2018 | u64 total_used = 0; | |
2019 | u64 total_free_data = 0; | |
2020 | u64 total_free_meta = 0; | |
2021 | int bits = dentry->d_sb->s_blocksize_bits; | |
2022 | __be32 *fsid = (__be32 *)fs_info->fsid; | |
2023 | unsigned factor = 1; | |
2024 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
2025 | int ret; | |
2026 | u64 thresh = 0; | |
2027 | ||
2028 | /* | |
2029 | * holding chunk_muext to avoid allocating new chunks, holding | |
2030 | * device_list_mutex to avoid the device being removed | |
2031 | */ | |
2032 | rcu_read_lock(); | |
2033 | list_for_each_entry_rcu(found, head, list) { | |
2034 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { | |
2035 | int i; | |
2036 | ||
2037 | total_free_data += found->disk_total - found->disk_used; | |
2038 | total_free_data -= | |
2039 | btrfs_account_ro_block_groups_free_space(found); | |
2040 | ||
2041 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
2042 | if (!list_empty(&found->block_groups[i])) { | |
2043 | switch (i) { | |
2044 | case BTRFS_RAID_DUP: | |
2045 | case BTRFS_RAID_RAID1: | |
2046 | case BTRFS_RAID_RAID10: | |
2047 | factor = 2; | |
2048 | } | |
2049 | } | |
2050 | } | |
2051 | } | |
2052 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) | |
2053 | total_free_meta += found->disk_total - found->disk_used; | |
2054 | ||
2055 | total_used += found->disk_used; | |
2056 | } | |
2057 | ||
2058 | rcu_read_unlock(); | |
2059 | ||
2060 | buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); | |
2061 | buf->f_blocks >>= bits; | |
2062 | buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); | |
2063 | ||
2064 | /* Account global block reserve as used, it's in logical size already */ | |
2065 | spin_lock(&block_rsv->lock); | |
2066 | buf->f_bfree -= block_rsv->size >> bits; | |
2067 | spin_unlock(&block_rsv->lock); | |
2068 | ||
2069 | buf->f_bavail = div_u64(total_free_data, factor); | |
2070 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); | |
2071 | if (ret) | |
2072 | return ret; | |
2073 | buf->f_bavail += div_u64(total_free_data, factor); | |
2074 | buf->f_bavail = buf->f_bavail >> bits; | |
2075 | ||
2076 | /* | |
2077 | * We calculate the remaining metadata space minus global reserve. If | |
2078 | * this is (supposedly) smaller than zero, there's no space. But this | |
2079 | * does not hold in practice, the exhausted state happens where's still | |
2080 | * some positive delta. So we apply some guesswork and compare the | |
2081 | * delta to a 4M threshold. (Practically observed delta was ~2M.) | |
2082 | * | |
2083 | * We probably cannot calculate the exact threshold value because this | |
2084 | * depends on the internal reservations requested by various | |
2085 | * operations, so some operations that consume a few metadata will | |
2086 | * succeed even if the Avail is zero. But this is better than the other | |
2087 | * way around. | |
2088 | */ | |
2089 | thresh = 4 * 1024 * 1024; | |
2090 | ||
2091 | if (total_free_meta - thresh < block_rsv->size) | |
2092 | buf->f_bavail = 0; | |
2093 | ||
2094 | buf->f_type = BTRFS_SUPER_MAGIC; | |
2095 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2096 | buf->f_namelen = BTRFS_NAME_LEN; | |
2097 | ||
2098 | /* We treat it as constant endianness (it doesn't matter _which_) | |
2099 | because we want the fsid to come out the same whether mounted | |
2100 | on a big-endian or little-endian host */ | |
2101 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
2102 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
2103 | /* Mask in the root object ID too, to disambiguate subvols */ | |
2104 | buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; | |
2105 | buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; | |
2106 | ||
2107 | return 0; | |
2108 | } | |
2109 | ||
2110 | static void btrfs_kill_super(struct super_block *sb) | |
2111 | { | |
2112 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); | |
2113 | kill_anon_super(sb); | |
2114 | free_fs_info(fs_info); | |
2115 | } | |
2116 | ||
2117 | static struct file_system_type btrfs_fs_type = { | |
2118 | .owner = THIS_MODULE, | |
2119 | .name = "btrfs", | |
2120 | .mount = btrfs_mount, | |
2121 | .kill_sb = btrfs_kill_super, | |
2122 | .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, | |
2123 | }; | |
2124 | MODULE_ALIAS_FS("btrfs"); | |
2125 | ||
2126 | static int btrfs_control_open(struct inode *inode, struct file *file) | |
2127 | { | |
2128 | /* | |
2129 | * The control file's private_data is used to hold the | |
2130 | * transaction when it is started and is used to keep | |
2131 | * track of whether a transaction is already in progress. | |
2132 | */ | |
2133 | file->private_data = NULL; | |
2134 | return 0; | |
2135 | } | |
2136 | ||
2137 | /* | |
2138 | * used by btrfsctl to scan devices when no FS is mounted | |
2139 | */ | |
2140 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, | |
2141 | unsigned long arg) | |
2142 | { | |
2143 | struct btrfs_ioctl_vol_args *vol; | |
2144 | struct btrfs_fs_devices *fs_devices; | |
2145 | int ret = -ENOTTY; | |
2146 | ||
2147 | if (!capable(CAP_SYS_ADMIN)) | |
2148 | return -EPERM; | |
2149 | ||
2150 | vol = memdup_user((void __user *)arg, sizeof(*vol)); | |
2151 | if (IS_ERR(vol)) | |
2152 | return PTR_ERR(vol); | |
2153 | ||
2154 | switch (cmd) { | |
2155 | case BTRFS_IOC_SCAN_DEV: | |
2156 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
2157 | &btrfs_fs_type, &fs_devices); | |
2158 | break; | |
2159 | case BTRFS_IOC_DEVICES_READY: | |
2160 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
2161 | &btrfs_fs_type, &fs_devices); | |
2162 | if (ret) | |
2163 | break; | |
2164 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
2165 | break; | |
2166 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: | |
2167 | ret = btrfs_ioctl_get_supported_features(NULL, | |
2168 | (void __user*)arg); | |
2169 | break; | |
2170 | } | |
2171 | ||
2172 | kfree(vol); | |
2173 | return ret; | |
2174 | } | |
2175 | ||
2176 | static int btrfs_freeze(struct super_block *sb) | |
2177 | { | |
2178 | struct btrfs_trans_handle *trans; | |
2179 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
2180 | ||
2181 | trans = btrfs_attach_transaction_barrier(root); | |
2182 | if (IS_ERR(trans)) { | |
2183 | /* no transaction, don't bother */ | |
2184 | if (PTR_ERR(trans) == -ENOENT) | |
2185 | return 0; | |
2186 | return PTR_ERR(trans); | |
2187 | } | |
2188 | return btrfs_commit_transaction(trans, root); | |
2189 | } | |
2190 | ||
2191 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) | |
2192 | { | |
2193 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
2194 | struct btrfs_fs_devices *cur_devices; | |
2195 | struct btrfs_device *dev, *first_dev = NULL; | |
2196 | struct list_head *head; | |
2197 | struct rcu_string *name; | |
2198 | ||
2199 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
2200 | cur_devices = fs_info->fs_devices; | |
2201 | while (cur_devices) { | |
2202 | head = &cur_devices->devices; | |
2203 | list_for_each_entry(dev, head, dev_list) { | |
2204 | if (dev->missing) | |
2205 | continue; | |
2206 | if (!dev->name) | |
2207 | continue; | |
2208 | if (!first_dev || dev->devid < first_dev->devid) | |
2209 | first_dev = dev; | |
2210 | } | |
2211 | cur_devices = cur_devices->seed; | |
2212 | } | |
2213 | ||
2214 | if (first_dev) { | |
2215 | rcu_read_lock(); | |
2216 | name = rcu_dereference(first_dev->name); | |
2217 | seq_escape(m, name->str, " \t\n\\"); | |
2218 | rcu_read_unlock(); | |
2219 | } else { | |
2220 | WARN_ON(1); | |
2221 | } | |
2222 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
2223 | return 0; | |
2224 | } | |
2225 | ||
2226 | static const struct super_operations btrfs_super_ops = { | |
2227 | .drop_inode = btrfs_drop_inode, | |
2228 | .evict_inode = btrfs_evict_inode, | |
2229 | .put_super = btrfs_put_super, | |
2230 | .sync_fs = btrfs_sync_fs, | |
2231 | .show_options = btrfs_show_options, | |
2232 | .show_devname = btrfs_show_devname, | |
2233 | .write_inode = btrfs_write_inode, | |
2234 | .alloc_inode = btrfs_alloc_inode, | |
2235 | .destroy_inode = btrfs_destroy_inode, | |
2236 | .statfs = btrfs_statfs, | |
2237 | .remount_fs = btrfs_remount, | |
2238 | .freeze_fs = btrfs_freeze, | |
2239 | }; | |
2240 | ||
2241 | static const struct file_operations btrfs_ctl_fops = { | |
2242 | .open = btrfs_control_open, | |
2243 | .unlocked_ioctl = btrfs_control_ioctl, | |
2244 | .compat_ioctl = btrfs_control_ioctl, | |
2245 | .owner = THIS_MODULE, | |
2246 | .llseek = noop_llseek, | |
2247 | }; | |
2248 | ||
2249 | static struct miscdevice btrfs_misc = { | |
2250 | .minor = BTRFS_MINOR, | |
2251 | .name = "btrfs-control", | |
2252 | .fops = &btrfs_ctl_fops | |
2253 | }; | |
2254 | ||
2255 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); | |
2256 | MODULE_ALIAS("devname:btrfs-control"); | |
2257 | ||
2258 | static int btrfs_interface_init(void) | |
2259 | { | |
2260 | return misc_register(&btrfs_misc); | |
2261 | } | |
2262 | ||
2263 | static void btrfs_interface_exit(void) | |
2264 | { | |
2265 | misc_deregister(&btrfs_misc); | |
2266 | } | |
2267 | ||
2268 | static void btrfs_print_info(void) | |
2269 | { | |
2270 | printk(KERN_INFO "Btrfs loaded" | |
2271 | #ifdef CONFIG_BTRFS_DEBUG | |
2272 | ", debug=on" | |
2273 | #endif | |
2274 | #ifdef CONFIG_BTRFS_ASSERT | |
2275 | ", assert=on" | |
2276 | #endif | |
2277 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
2278 | ", integrity-checker=on" | |
2279 | #endif | |
2280 | "\n"); | |
2281 | } | |
2282 | ||
2283 | static int btrfs_run_sanity_tests(void) | |
2284 | { | |
2285 | int ret; | |
2286 | ||
2287 | ret = btrfs_init_test_fs(); | |
2288 | if (ret) | |
2289 | return ret; | |
2290 | ||
2291 | ret = btrfs_test_free_space_cache(); | |
2292 | if (ret) | |
2293 | goto out; | |
2294 | ret = btrfs_test_extent_buffer_operations(); | |
2295 | if (ret) | |
2296 | goto out; | |
2297 | ret = btrfs_test_extent_io(); | |
2298 | if (ret) | |
2299 | goto out; | |
2300 | ret = btrfs_test_inodes(); | |
2301 | if (ret) | |
2302 | goto out; | |
2303 | ret = btrfs_test_qgroups(); | |
2304 | if (ret) | |
2305 | goto out; | |
2306 | ret = btrfs_test_free_space_tree(); | |
2307 | out: | |
2308 | btrfs_destroy_test_fs(); | |
2309 | return ret; | |
2310 | } | |
2311 | ||
2312 | static int __init init_btrfs_fs(void) | |
2313 | { | |
2314 | int err; | |
2315 | ||
2316 | err = btrfs_hash_init(); | |
2317 | if (err) | |
2318 | return err; | |
2319 | ||
2320 | btrfs_props_init(); | |
2321 | ||
2322 | err = btrfs_init_sysfs(); | |
2323 | if (err) | |
2324 | goto free_hash; | |
2325 | ||
2326 | btrfs_init_compress(); | |
2327 | ||
2328 | err = btrfs_init_cachep(); | |
2329 | if (err) | |
2330 | goto free_compress; | |
2331 | ||
2332 | err = extent_io_init(); | |
2333 | if (err) | |
2334 | goto free_cachep; | |
2335 | ||
2336 | err = extent_map_init(); | |
2337 | if (err) | |
2338 | goto free_extent_io; | |
2339 | ||
2340 | err = ordered_data_init(); | |
2341 | if (err) | |
2342 | goto free_extent_map; | |
2343 | ||
2344 | err = btrfs_delayed_inode_init(); | |
2345 | if (err) | |
2346 | goto free_ordered_data; | |
2347 | ||
2348 | err = btrfs_auto_defrag_init(); | |
2349 | if (err) | |
2350 | goto free_delayed_inode; | |
2351 | ||
2352 | err = btrfs_delayed_ref_init(); | |
2353 | if (err) | |
2354 | goto free_auto_defrag; | |
2355 | ||
2356 | err = btrfs_prelim_ref_init(); | |
2357 | if (err) | |
2358 | goto free_delayed_ref; | |
2359 | ||
2360 | err = btrfs_end_io_wq_init(); | |
2361 | if (err) | |
2362 | goto free_prelim_ref; | |
2363 | ||
2364 | err = btrfs_interface_init(); | |
2365 | if (err) | |
2366 | goto free_end_io_wq; | |
2367 | ||
2368 | btrfs_init_lockdep(); | |
2369 | ||
2370 | btrfs_print_info(); | |
2371 | ||
2372 | err = btrfs_run_sanity_tests(); | |
2373 | if (err) | |
2374 | goto unregister_ioctl; | |
2375 | ||
2376 | err = register_filesystem(&btrfs_fs_type); | |
2377 | if (err) | |
2378 | goto unregister_ioctl; | |
2379 | ||
2380 | return 0; | |
2381 | ||
2382 | unregister_ioctl: | |
2383 | btrfs_interface_exit(); | |
2384 | free_end_io_wq: | |
2385 | btrfs_end_io_wq_exit(); | |
2386 | free_prelim_ref: | |
2387 | btrfs_prelim_ref_exit(); | |
2388 | free_delayed_ref: | |
2389 | btrfs_delayed_ref_exit(); | |
2390 | free_auto_defrag: | |
2391 | btrfs_auto_defrag_exit(); | |
2392 | free_delayed_inode: | |
2393 | btrfs_delayed_inode_exit(); | |
2394 | free_ordered_data: | |
2395 | ordered_data_exit(); | |
2396 | free_extent_map: | |
2397 | extent_map_exit(); | |
2398 | free_extent_io: | |
2399 | extent_io_exit(); | |
2400 | free_cachep: | |
2401 | btrfs_destroy_cachep(); | |
2402 | free_compress: | |
2403 | btrfs_exit_compress(); | |
2404 | btrfs_exit_sysfs(); | |
2405 | free_hash: | |
2406 | btrfs_hash_exit(); | |
2407 | return err; | |
2408 | } | |
2409 | ||
2410 | static void __exit exit_btrfs_fs(void) | |
2411 | { | |
2412 | btrfs_destroy_cachep(); | |
2413 | btrfs_delayed_ref_exit(); | |
2414 | btrfs_auto_defrag_exit(); | |
2415 | btrfs_delayed_inode_exit(); | |
2416 | btrfs_prelim_ref_exit(); | |
2417 | ordered_data_exit(); | |
2418 | extent_map_exit(); | |
2419 | extent_io_exit(); | |
2420 | btrfs_interface_exit(); | |
2421 | btrfs_end_io_wq_exit(); | |
2422 | unregister_filesystem(&btrfs_fs_type); | |
2423 | btrfs_exit_sysfs(); | |
2424 | btrfs_cleanup_fs_uuids(); | |
2425 | btrfs_exit_compress(); | |
2426 | btrfs_hash_exit(); | |
2427 | } | |
2428 | ||
2429 | late_initcall(init_btrfs_fs); | |
2430 | module_exit(exit_btrfs_fs) | |
2431 | ||
2432 | MODULE_LICENSE("GPL"); |