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6cbd5570 CM |
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 | ||
4b82d6e4 | 19 | #include <linux/blkdev.h> |
2e635a27 | 20 | #include <linux/module.h> |
e20d96d6 | 21 | #include <linux/buffer_head.h> |
2e635a27 CM |
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> | |
a9572a15 | 27 | #include <linux/seq_file.h> |
2e635a27 | 28 | #include <linux/string.h> |
2e635a27 | 29 | #include <linux/backing-dev.h> |
4b82d6e4 | 30 | #include <linux/mount.h> |
dee26a9f | 31 | #include <linux/mpage.h> |
75dfe396 CM |
32 | #include <linux/swap.h> |
33 | #include <linux/writeback.h> | |
8fd17795 | 34 | #include <linux/statfs.h> |
08607c1b | 35 | #include <linux/compat.h> |
95e05289 | 36 | #include <linux/parser.h> |
c59f8951 | 37 | #include <linux/ctype.h> |
6da6abae | 38 | #include <linux/namei.h> |
a9218f6b | 39 | #include <linux/miscdevice.h> |
1bcbf313 | 40 | #include <linux/magic.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
90a887c9 | 42 | #include <linux/cleancache.h> |
22c44fe6 | 43 | #include <linux/ratelimit.h> |
55e301fd | 44 | #include <linux/btrfs.h> |
4b4e25f2 | 45 | #include "compat.h" |
16cdcec7 | 46 | #include "delayed-inode.h" |
2e635a27 | 47 | #include "ctree.h" |
e20d96d6 | 48 | #include "disk-io.h" |
d5719762 | 49 | #include "transaction.h" |
2c90e5d6 | 50 | #include "btrfs_inode.h" |
3a686375 | 51 | #include "print-tree.h" |
5103e947 | 52 | #include "xattr.h" |
8a4b83cc | 53 | #include "volumes.h" |
be6e8dc0 | 54 | #include "export.h" |
c8b97818 | 55 | #include "compression.h" |
9c5085c1 | 56 | #include "rcu-string.h" |
8dabb742 | 57 | #include "dev-replace.h" |
74255aa0 | 58 | #include "free-space-cache.h" |
b9e9a6cb | 59 | #include "backref.h" |
dc11dd5d | 60 | #include "tests/btrfs-tests.h" |
2e635a27 | 61 | |
1abe9b8a | 62 | #define CREATE_TRACE_POINTS |
63 | #include <trace/events/btrfs.h> | |
64 | ||
b87221de | 65 | static const struct super_operations btrfs_super_ops; |
830c4adb | 66 | static struct file_system_type btrfs_fs_type; |
75dfe396 | 67 | |
08748810 | 68 | static const char *btrfs_decode_error(int errno) |
acce952b | 69 | { |
08748810 | 70 | char *errstr = "unknown"; |
acce952b | 71 | |
72 | switch (errno) { | |
73 | case -EIO: | |
74 | errstr = "IO failure"; | |
75 | break; | |
76 | case -ENOMEM: | |
77 | errstr = "Out of memory"; | |
78 | break; | |
79 | case -EROFS: | |
80 | errstr = "Readonly filesystem"; | |
81 | break; | |
8c342930 JM |
82 | case -EEXIST: |
83 | errstr = "Object already exists"; | |
84 | break; | |
94ef7280 DS |
85 | case -ENOSPC: |
86 | errstr = "No space left"; | |
87 | break; | |
88 | case -ENOENT: | |
89 | errstr = "No such entry"; | |
90 | break; | |
acce952b | 91 | } |
92 | ||
93 | return errstr; | |
94 | } | |
95 | ||
bbece8a3 | 96 | static void save_error_info(struct btrfs_fs_info *fs_info) |
acce952b | 97 | { |
98 | /* | |
99 | * today we only save the error info into ram. Long term we'll | |
100 | * also send it down to the disk | |
101 | */ | |
87533c47 | 102 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); |
acce952b | 103 | } |
104 | ||
acce952b | 105 | /* btrfs handle error by forcing the filesystem readonly */ |
106 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) | |
107 | { | |
108 | struct super_block *sb = fs_info->sb; | |
109 | ||
110 | if (sb->s_flags & MS_RDONLY) | |
111 | return; | |
112 | ||
87533c47 | 113 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
acce952b | 114 | sb->s_flags |= MS_RDONLY; |
c2cf52eb | 115 | btrfs_info(fs_info, "forced readonly"); |
1acd6831 SB |
116 | /* |
117 | * Note that a running device replace operation is not | |
118 | * canceled here although there is no way to update | |
119 | * the progress. It would add the risk of a deadlock, | |
120 | * therefore the canceling is ommited. The only penalty | |
121 | * is that some I/O remains active until the procedure | |
122 | * completes. The next time when the filesystem is | |
123 | * mounted writeable again, the device replace | |
124 | * operation continues. | |
125 | */ | |
acce952b | 126 | } |
127 | } | |
128 | ||
533574c6 | 129 | #ifdef CONFIG_PRINTK |
acce952b | 130 | /* |
131 | * __btrfs_std_error decodes expected errors from the caller and | |
132 | * invokes the approciate error response. | |
133 | */ | |
134 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
4da35113 | 135 | unsigned int line, int errno, const char *fmt, ...) |
acce952b | 136 | { |
137 | struct super_block *sb = fs_info->sb; | |
acce952b | 138 | const char *errstr; |
139 | ||
140 | /* | |
141 | * Special case: if the error is EROFS, and we're already | |
142 | * under MS_RDONLY, then it is safe here. | |
143 | */ | |
144 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
4da35113 JM |
145 | return; |
146 | ||
08748810 | 147 | errstr = btrfs_decode_error(errno); |
4da35113 | 148 | if (fmt) { |
37252a66 ES |
149 | struct va_format vaf; |
150 | va_list args; | |
151 | ||
152 | va_start(args, fmt); | |
153 | vaf.fmt = fmt; | |
154 | vaf.va = &args; | |
4da35113 | 155 | |
08748810 DS |
156 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: errno=%d %s (%pV)\n", |
157 | sb->s_id, function, line, errno, errstr, &vaf); | |
37252a66 | 158 | va_end(args); |
4da35113 | 159 | } else { |
08748810 DS |
160 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: errno=%d %s\n", |
161 | sb->s_id, function, line, errno, errstr); | |
4da35113 | 162 | } |
acce952b | 163 | |
4da35113 | 164 | /* Don't go through full error handling during mount */ |
cf79ffb5 JB |
165 | save_error_info(fs_info); |
166 | if (sb->s_flags & MS_BORN) | |
4da35113 | 167 | btrfs_handle_error(fs_info); |
4da35113 | 168 | } |
acce952b | 169 | |
533574c6 | 170 | static const char * const logtypes[] = { |
4da35113 JM |
171 | "emergency", |
172 | "alert", | |
173 | "critical", | |
174 | "error", | |
175 | "warning", | |
176 | "notice", | |
177 | "info", | |
178 | "debug", | |
179 | }; | |
180 | ||
c2cf52eb | 181 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
4da35113 JM |
182 | { |
183 | struct super_block *sb = fs_info->sb; | |
184 | char lvl[4]; | |
185 | struct va_format vaf; | |
186 | va_list args; | |
187 | const char *type = logtypes[4]; | |
533574c6 | 188 | int kern_level; |
4da35113 JM |
189 | |
190 | va_start(args, fmt); | |
191 | ||
533574c6 JP |
192 | kern_level = printk_get_level(fmt); |
193 | if (kern_level) { | |
194 | size_t size = printk_skip_level(fmt) - fmt; | |
195 | memcpy(lvl, fmt, size); | |
196 | lvl[size] = '\0'; | |
197 | fmt += size; | |
198 | type = logtypes[kern_level - '0']; | |
4da35113 JM |
199 | } else |
200 | *lvl = '\0'; | |
201 | ||
202 | vaf.fmt = fmt; | |
203 | vaf.va = &args; | |
533574c6 | 204 | |
c2cf52eb | 205 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); |
533574c6 JP |
206 | |
207 | va_end(args); | |
208 | } | |
209 | ||
210 | #else | |
211 | ||
212 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
213 | unsigned int line, int errno, const char *fmt, ...) | |
214 | { | |
215 | struct super_block *sb = fs_info->sb; | |
216 | ||
217 | /* | |
218 | * Special case: if the error is EROFS, and we're already | |
219 | * under MS_RDONLY, then it is safe here. | |
220 | */ | |
221 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
222 | return; | |
223 | ||
224 | /* Don't go through full error handling during mount */ | |
225 | if (sb->s_flags & MS_BORN) { | |
226 | save_error_info(fs_info); | |
227 | btrfs_handle_error(fs_info); | |
228 | } | |
acce952b | 229 | } |
533574c6 | 230 | #endif |
acce952b | 231 | |
49b25e05 JM |
232 | /* |
233 | * We only mark the transaction aborted and then set the file system read-only. | |
234 | * This will prevent new transactions from starting or trying to join this | |
235 | * one. | |
236 | * | |
237 | * This means that error recovery at the call site is limited to freeing | |
238 | * any local memory allocations and passing the error code up without | |
239 | * further cleanup. The transaction should complete as it normally would | |
240 | * in the call path but will return -EIO. | |
241 | * | |
242 | * We'll complete the cleanup in btrfs_end_transaction and | |
243 | * btrfs_commit_transaction. | |
244 | */ | |
245 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, | |
246 | struct btrfs_root *root, const char *function, | |
247 | unsigned int line, int errno) | |
248 | { | |
08748810 DS |
249 | /* |
250 | * Report first abort since mount | |
251 | */ | |
252 | if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, | |
253 | &root->fs_info->fs_state)) { | |
254 | WARN(1, KERN_DEBUG "btrfs: Transaction aborted (error %d)\n", | |
255 | errno); | |
256 | } | |
49b25e05 JM |
257 | trans->aborted = errno; |
258 | /* Nothing used. The other threads that have joined this | |
259 | * transaction may be able to continue. */ | |
260 | if (!trans->blocks_used) { | |
69ce977a MX |
261 | const char *errstr; |
262 | ||
08748810 | 263 | errstr = btrfs_decode_error(errno); |
c2cf52eb SK |
264 | btrfs_warn(root->fs_info, |
265 | "%s:%d: Aborting unused transaction(%s).", | |
266 | function, line, errstr); | |
acce952b | 267 | return; |
49b25e05 | 268 | } |
8d25a086 | 269 | ACCESS_ONCE(trans->transaction->aborted) = errno; |
501407aa JB |
270 | /* Wake up anybody who may be waiting on this transaction */ |
271 | wake_up(&root->fs_info->transaction_wait); | |
272 | wake_up(&root->fs_info->transaction_blocked_wait); | |
49b25e05 JM |
273 | __btrfs_std_error(root->fs_info, function, line, errno, NULL); |
274 | } | |
8c342930 JM |
275 | /* |
276 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
277 | * issues an alert, and either panics or BUGs, depending on mount options. | |
278 | */ | |
279 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, | |
280 | unsigned int line, int errno, const char *fmt, ...) | |
281 | { | |
8c342930 JM |
282 | char *s_id = "<unknown>"; |
283 | const char *errstr; | |
284 | struct va_format vaf = { .fmt = fmt }; | |
285 | va_list args; | |
acce952b | 286 | |
8c342930 JM |
287 | if (fs_info) |
288 | s_id = fs_info->sb->s_id; | |
acce952b | 289 | |
8c342930 JM |
290 | va_start(args, fmt); |
291 | vaf.va = &args; | |
292 | ||
08748810 | 293 | errstr = btrfs_decode_error(errno); |
aa43a17c | 294 | if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) |
08748810 DS |
295 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
296 | s_id, function, line, &vaf, errno, errstr); | |
8c342930 | 297 | |
08748810 DS |
298 | printk(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
299 | s_id, function, line, &vaf, errno, errstr); | |
8c342930 JM |
300 | va_end(args); |
301 | /* Caller calls BUG() */ | |
acce952b | 302 | } |
303 | ||
d397712b | 304 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 305 | { |
815745cf | 306 | (void)close_ctree(btrfs_sb(sb)->tree_root); |
aea52e19 AV |
307 | /* FIXME: need to fix VFS to return error? */ |
308 | /* AV: return it _where_? ->put_super() can be triggered by any number | |
309 | * of async events, up to and including delivery of SIGKILL to the | |
310 | * last process that kept it busy. Or segfault in the aforementioned | |
311 | * process... Whom would you report that to? | |
312 | */ | |
75dfe396 CM |
313 | } |
314 | ||
95e05289 | 315 | enum { |
73f73415 | 316 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
317 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
318 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
261507a0 LZ |
319 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
320 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
91435650 | 321 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
9555c6c1 ID |
322 | Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, |
323 | Opt_no_space_cache, Opt_recovery, Opt_skip_balance, | |
21adbd5c | 324 | Opt_check_integrity, Opt_check_integrity_including_extent_data, |
f420ee1e | 325 | Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, |
8b87dc17 | 326 | Opt_commit_interval, |
9555c6c1 | 327 | Opt_err, |
95e05289 CM |
328 | }; |
329 | ||
330 | static match_table_t tokens = { | |
dfe25020 | 331 | {Opt_degraded, "degraded"}, |
95e05289 | 332 | {Opt_subvol, "subvol=%s"}, |
1493381f | 333 | {Opt_subvolid, "subvolid=%s"}, |
43e570b0 | 334 | {Opt_device, "device=%s"}, |
b6cda9bc | 335 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 336 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 337 | {Opt_nobarrier, "nobarrier"}, |
6f568d35 | 338 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 339 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 340 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 341 | {Opt_compress, "compress"}, |
261507a0 | 342 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 343 | {Opt_compress_force, "compress-force"}, |
261507a0 | 344 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 345 | {Opt_ssd, "ssd"}, |
451d7585 | 346 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 347 | {Opt_nossd, "nossd"}, |
33268eaf | 348 | {Opt_noacl, "noacl"}, |
3a5e1404 | 349 | {Opt_notreelog, "notreelog"}, |
dccae999 | 350 | {Opt_flushoncommit, "flushoncommit"}, |
97e728d4 | 351 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 352 | {Opt_discard, "discard"}, |
0af3d00b | 353 | {Opt_space_cache, "space_cache"}, |
88c2ba3b | 354 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 355 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 356 | {Opt_enospc_debug, "enospc_debug"}, |
e15d0542 | 357 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 358 | {Opt_defrag, "autodefrag"}, |
4b9465cb | 359 | {Opt_inode_cache, "inode_cache"}, |
8965593e | 360 | {Opt_no_space_cache, "nospace_cache"}, |
af31f5e5 | 361 | {Opt_recovery, "recovery"}, |
9555c6c1 | 362 | {Opt_skip_balance, "skip_balance"}, |
21adbd5c SB |
363 | {Opt_check_integrity, "check_int"}, |
364 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
365 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, | |
f420ee1e | 366 | {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, |
8c342930 | 367 | {Opt_fatal_errors, "fatal_errors=%s"}, |
8b87dc17 | 368 | {Opt_commit_interval, "commit=%d"}, |
33268eaf | 369 | {Opt_err, NULL}, |
95e05289 CM |
370 | }; |
371 | ||
edf24abe CH |
372 | /* |
373 | * Regular mount options parser. Everything that is needed only when | |
374 | * reading in a new superblock is parsed here. | |
49b25e05 | 375 | * XXX JDM: This needs to be cleaned up for remount. |
edf24abe CH |
376 | */ |
377 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 378 | { |
edf24abe | 379 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 380 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
381 | char *p, *num, *orig = NULL; |
382 | u64 cache_gen; | |
4543df7e | 383 | int intarg; |
a7a3f7ca | 384 | int ret = 0; |
261507a0 LZ |
385 | char *compress_type; |
386 | bool compress_force = false; | |
b6cda9bc | 387 | |
6c41761f | 388 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 JB |
389 | if (cache_gen) |
390 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); | |
391 | ||
95e05289 | 392 | if (!options) |
73bc1876 | 393 | goto out; |
95e05289 | 394 | |
be20aa9d CM |
395 | /* |
396 | * strsep changes the string, duplicate it because parse_options | |
397 | * gets called twice | |
398 | */ | |
399 | options = kstrdup(options, GFP_NOFS); | |
400 | if (!options) | |
401 | return -ENOMEM; | |
402 | ||
da495ecc | 403 | orig = options; |
be20aa9d | 404 | |
edf24abe | 405 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
406 | int token; |
407 | if (!*p) | |
408 | continue; | |
409 | ||
410 | token = match_token(p, tokens, args); | |
411 | switch (token) { | |
dfe25020 | 412 | case Opt_degraded: |
edf24abe CH |
413 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
414 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 415 | break; |
95e05289 | 416 | case Opt_subvol: |
73f73415 | 417 | case Opt_subvolid: |
e15d0542 | 418 | case Opt_subvolrootid: |
43e570b0 | 419 | case Opt_device: |
edf24abe | 420 | /* |
43e570b0 | 421 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
422 | * and can be happily ignored here. |
423 | */ | |
b6cda9bc CM |
424 | break; |
425 | case Opt_nodatasum: | |
067c28ad | 426 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
edf24abe | 427 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
428 | break; |
429 | case Opt_nodatacow: | |
bedb2cca AP |
430 | if (!btrfs_test_opt(root, COMPRESS) || |
431 | !btrfs_test_opt(root, FORCE_COMPRESS)) { | |
432 | printk(KERN_INFO "btrfs: setting nodatacow, compression disabled\n"); | |
433 | } else { | |
434 | printk(KERN_INFO "btrfs: setting nodatacow\n"); | |
435 | } | |
436 | info->compress_type = BTRFS_COMPRESS_NONE; | |
437 | btrfs_clear_opt(info->mount_opt, COMPRESS); | |
438 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
edf24abe CH |
439 | btrfs_set_opt(info->mount_opt, NODATACOW); |
440 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 441 | break; |
a555f810 | 442 | case Opt_compress_force: |
261507a0 LZ |
443 | case Opt_compress_force_type: |
444 | compress_force = true; | |
1c697d4a | 445 | /* Fallthrough */ |
261507a0 LZ |
446 | case Opt_compress: |
447 | case Opt_compress_type: | |
448 | if (token == Opt_compress || | |
449 | token == Opt_compress_force || | |
450 | strcmp(args[0].from, "zlib") == 0) { | |
451 | compress_type = "zlib"; | |
452 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
063849ea | 453 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
454 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
455 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
a6fa6fae LZ |
456 | } else if (strcmp(args[0].from, "lzo") == 0) { |
457 | compress_type = "lzo"; | |
458 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 459 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
460 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
461 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
2b0ce2c2 | 462 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
063849ea AH |
463 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
464 | compress_type = "no"; | |
465 | info->compress_type = BTRFS_COMPRESS_NONE; | |
466 | btrfs_clear_opt(info->mount_opt, COMPRESS); | |
467 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
468 | compress_force = false; | |
261507a0 LZ |
469 | } else { |
470 | ret = -EINVAL; | |
471 | goto out; | |
472 | } | |
473 | ||
261507a0 LZ |
474 | if (compress_force) { |
475 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
476 | pr_info("btrfs: force %s compression\n", | |
477 | compress_type); | |
478 | } else | |
479 | pr_info("btrfs: use %s compression\n", | |
480 | compress_type); | |
a555f810 | 481 | break; |
e18e4809 | 482 | case Opt_ssd: |
edf24abe CH |
483 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
484 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 485 | break; |
451d7585 CM |
486 | case Opt_ssd_spread: |
487 | printk(KERN_INFO "btrfs: use spread ssd " | |
488 | "allocation scheme\n"); | |
489 | btrfs_set_opt(info->mount_opt, SSD); | |
490 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
491 | break; | |
3b30c22f | 492 | case Opt_nossd: |
451d7585 CM |
493 | printk(KERN_INFO "btrfs: not using ssd allocation " |
494 | "scheme\n"); | |
c289811c | 495 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 496 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 497 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 498 | break; |
21ad10cf | 499 | case Opt_nobarrier: |
edf24abe CH |
500 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
501 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 502 | break; |
4543df7e | 503 | case Opt_thread_pool: |
2c334e87 WS |
504 | ret = match_int(&args[0], &intarg); |
505 | if (ret) { | |
506 | goto out; | |
507 | } else if (intarg > 0) { | |
4543df7e | 508 | info->thread_pool_size = intarg; |
2c334e87 WS |
509 | } else { |
510 | ret = -EINVAL; | |
511 | goto out; | |
512 | } | |
4543df7e | 513 | break; |
6f568d35 | 514 | case Opt_max_inline: |
edf24abe CH |
515 | num = match_strdup(&args[0]); |
516 | if (num) { | |
91748467 | 517 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
518 | kfree(num); |
519 | ||
15ada040 CM |
520 | if (info->max_inline) { |
521 | info->max_inline = max_t(u64, | |
522 | info->max_inline, | |
523 | root->sectorsize); | |
524 | } | |
edf24abe | 525 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
c1c9ff7c | 526 | info->max_inline); |
2c334e87 WS |
527 | } else { |
528 | ret = -ENOMEM; | |
529 | goto out; | |
6f568d35 CM |
530 | } |
531 | break; | |
8f662a76 | 532 | case Opt_alloc_start: |
edf24abe CH |
533 | num = match_strdup(&args[0]); |
534 | if (num) { | |
c018daec | 535 | mutex_lock(&info->chunk_mutex); |
91748467 | 536 | info->alloc_start = memparse(num, NULL); |
c018daec | 537 | mutex_unlock(&info->chunk_mutex); |
edf24abe CH |
538 | kfree(num); |
539 | printk(KERN_INFO | |
540 | "btrfs: allocations start at %llu\n", | |
c1c9ff7c | 541 | info->alloc_start); |
2c334e87 WS |
542 | } else { |
543 | ret = -ENOMEM; | |
544 | goto out; | |
8f662a76 CM |
545 | } |
546 | break; | |
33268eaf JB |
547 | case Opt_noacl: |
548 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
549 | break; | |
3a5e1404 SW |
550 | case Opt_notreelog: |
551 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
552 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
553 | break; | |
dccae999 SW |
554 | case Opt_flushoncommit: |
555 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
556 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
557 | break; | |
97e728d4 | 558 | case Opt_ratio: |
2c334e87 WS |
559 | ret = match_int(&args[0], &intarg); |
560 | if (ret) { | |
561 | goto out; | |
562 | } else if (intarg >= 0) { | |
97e728d4 JB |
563 | info->metadata_ratio = intarg; |
564 | printk(KERN_INFO "btrfs: metadata ratio %d\n", | |
565 | info->metadata_ratio); | |
2c334e87 WS |
566 | } else { |
567 | ret = -EINVAL; | |
568 | goto out; | |
97e728d4 JB |
569 | } |
570 | break; | |
e244a0ae CH |
571 | case Opt_discard: |
572 | btrfs_set_opt(info->mount_opt, DISCARD); | |
573 | break; | |
0af3d00b | 574 | case Opt_space_cache: |
0af3d00b | 575 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
0de90876 | 576 | break; |
f420ee1e SB |
577 | case Opt_rescan_uuid_tree: |
578 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); | |
579 | break; | |
73bc1876 JB |
580 | case Opt_no_space_cache: |
581 | printk(KERN_INFO "btrfs: disabling disk space caching\n"); | |
582 | btrfs_clear_opt(info->mount_opt, SPACE_CACHE); | |
583 | break; | |
4b9465cb CM |
584 | case Opt_inode_cache: |
585 | printk(KERN_INFO "btrfs: enabling inode map caching\n"); | |
586 | btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); | |
587 | break; | |
88c2ba3b JB |
588 | case Opt_clear_cache: |
589 | printk(KERN_INFO "btrfs: force clearing of disk cache\n"); | |
590 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); | |
0af3d00b | 591 | break; |
4260f7c7 SW |
592 | case Opt_user_subvol_rm_allowed: |
593 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
594 | break; | |
91435650 CM |
595 | case Opt_enospc_debug: |
596 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
597 | break; | |
4cb5300b | 598 | case Opt_defrag: |
48940662 | 599 | printk(KERN_INFO "btrfs: enabling auto defrag\n"); |
4cb5300b CM |
600 | btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); |
601 | break; | |
af31f5e5 | 602 | case Opt_recovery: |
48940662 | 603 | printk(KERN_INFO "btrfs: enabling auto recovery\n"); |
af31f5e5 CM |
604 | btrfs_set_opt(info->mount_opt, RECOVERY); |
605 | break; | |
9555c6c1 ID |
606 | case Opt_skip_balance: |
607 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
608 | break; | |
21adbd5c SB |
609 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
610 | case Opt_check_integrity_including_extent_data: | |
611 | printk(KERN_INFO "btrfs: enabling check integrity" | |
612 | " including extent data\n"); | |
613 | btrfs_set_opt(info->mount_opt, | |
614 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
615 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
616 | break; | |
617 | case Opt_check_integrity: | |
618 | printk(KERN_INFO "btrfs: enabling check integrity\n"); | |
619 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
620 | break; | |
621 | case Opt_check_integrity_print_mask: | |
2c334e87 WS |
622 | ret = match_int(&args[0], &intarg); |
623 | if (ret) { | |
624 | goto out; | |
625 | } else if (intarg >= 0) { | |
21adbd5c SB |
626 | info->check_integrity_print_mask = intarg; |
627 | printk(KERN_INFO "btrfs:" | |
628 | " check_integrity_print_mask 0x%x\n", | |
629 | info->check_integrity_print_mask); | |
2c334e87 WS |
630 | } else { |
631 | ret = -EINVAL; | |
632 | goto out; | |
21adbd5c SB |
633 | } |
634 | break; | |
635 | #else | |
636 | case Opt_check_integrity_including_extent_data: | |
637 | case Opt_check_integrity: | |
638 | case Opt_check_integrity_print_mask: | |
639 | printk(KERN_ERR "btrfs: support for check_integrity*" | |
640 | " not compiled in!\n"); | |
641 | ret = -EINVAL; | |
642 | goto out; | |
643 | #endif | |
8c342930 JM |
644 | case Opt_fatal_errors: |
645 | if (strcmp(args[0].from, "panic") == 0) | |
646 | btrfs_set_opt(info->mount_opt, | |
647 | PANIC_ON_FATAL_ERROR); | |
648 | else if (strcmp(args[0].from, "bug") == 0) | |
649 | btrfs_clear_opt(info->mount_opt, | |
650 | PANIC_ON_FATAL_ERROR); | |
651 | else { | |
652 | ret = -EINVAL; | |
653 | goto out; | |
654 | } | |
655 | break; | |
8b87dc17 DS |
656 | case Opt_commit_interval: |
657 | intarg = 0; | |
658 | ret = match_int(&args[0], &intarg); | |
659 | if (ret < 0) { | |
660 | printk(KERN_ERR | |
661 | "btrfs: invalid commit interval\n"); | |
662 | ret = -EINVAL; | |
663 | goto out; | |
664 | } | |
665 | if (intarg > 0) { | |
666 | if (intarg > 300) { | |
667 | printk(KERN_WARNING | |
668 | "btrfs: excessive commit interval %d\n", | |
669 | intarg); | |
670 | } | |
671 | info->commit_interval = intarg; | |
672 | } else { | |
673 | printk(KERN_INFO | |
674 | "btrfs: using default commit interval %ds\n", | |
675 | BTRFS_DEFAULT_COMMIT_INTERVAL); | |
676 | info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; | |
677 | } | |
678 | break; | |
a7a3f7ca SW |
679 | case Opt_err: |
680 | printk(KERN_INFO "btrfs: unrecognized mount option " | |
681 | "'%s'\n", p); | |
682 | ret = -EINVAL; | |
683 | goto out; | |
95e05289 | 684 | default: |
be20aa9d | 685 | break; |
95e05289 CM |
686 | } |
687 | } | |
a7a3f7ca | 688 | out: |
73bc1876 JB |
689 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
690 | printk(KERN_INFO "btrfs: disk space caching is enabled\n"); | |
da495ecc | 691 | kfree(orig); |
a7a3f7ca | 692 | return ret; |
edf24abe CH |
693 | } |
694 | ||
695 | /* | |
696 | * Parse mount options that are required early in the mount process. | |
697 | * | |
698 | * All other options will be parsed on much later in the mount process and | |
699 | * only when we need to allocate a new super block. | |
700 | */ | |
97288f2c | 701 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 702 | void *holder, char **subvol_name, u64 *subvol_objectid, |
5e2a4b25 | 703 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
704 | { |
705 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 706 | char *device_name, *opts, *orig, *p; |
1493381f | 707 | char *num = NULL; |
edf24abe CH |
708 | int error = 0; |
709 | ||
710 | if (!options) | |
830c4adb | 711 | return 0; |
edf24abe CH |
712 | |
713 | /* | |
714 | * strsep changes the string, duplicate it because parse_options | |
715 | * gets called twice | |
716 | */ | |
717 | opts = kstrdup(options, GFP_KERNEL); | |
718 | if (!opts) | |
719 | return -ENOMEM; | |
3f3d0bc0 | 720 | orig = opts; |
edf24abe CH |
721 | |
722 | while ((p = strsep(&opts, ",")) != NULL) { | |
723 | int token; | |
724 | if (!*p) | |
725 | continue; | |
726 | ||
727 | token = match_token(p, tokens, args); | |
728 | switch (token) { | |
729 | case Opt_subvol: | |
a90e8b6f | 730 | kfree(*subvol_name); |
edf24abe | 731 | *subvol_name = match_strdup(&args[0]); |
2c334e87 WS |
732 | if (!*subvol_name) { |
733 | error = -ENOMEM; | |
734 | goto out; | |
735 | } | |
edf24abe | 736 | break; |
73f73415 | 737 | case Opt_subvolid: |
1493381f WS |
738 | num = match_strdup(&args[0]); |
739 | if (num) { | |
740 | *subvol_objectid = memparse(num, NULL); | |
741 | kfree(num); | |
4849f01d | 742 | /* we want the original fs_tree */ |
1493381f | 743 | if (!*subvol_objectid) |
4849f01d JB |
744 | *subvol_objectid = |
745 | BTRFS_FS_TREE_OBJECTID; | |
2c334e87 WS |
746 | } else { |
747 | error = -EINVAL; | |
748 | goto out; | |
4849f01d | 749 | } |
73f73415 | 750 | break; |
e15d0542 | 751 | case Opt_subvolrootid: |
5e2a4b25 DS |
752 | printk(KERN_WARNING |
753 | "btrfs: 'subvolrootid' mount option is deprecated and has no effect\n"); | |
e15d0542 | 754 | break; |
43e570b0 | 755 | case Opt_device: |
83c8c9bd JL |
756 | device_name = match_strdup(&args[0]); |
757 | if (!device_name) { | |
758 | error = -ENOMEM; | |
759 | goto out; | |
760 | } | |
761 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 762 | flags, holder, fs_devices); |
83c8c9bd | 763 | kfree(device_name); |
43e570b0 | 764 | if (error) |
830c4adb | 765 | goto out; |
43e570b0 | 766 | break; |
edf24abe CH |
767 | default: |
768 | break; | |
769 | } | |
770 | } | |
771 | ||
830c4adb | 772 | out: |
3f3d0bc0 | 773 | kfree(orig); |
edf24abe | 774 | return error; |
95e05289 CM |
775 | } |
776 | ||
73f73415 JB |
777 | static struct dentry *get_default_root(struct super_block *sb, |
778 | u64 subvol_objectid) | |
779 | { | |
815745cf AV |
780 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
781 | struct btrfs_root *root = fs_info->tree_root; | |
73f73415 JB |
782 | struct btrfs_root *new_root; |
783 | struct btrfs_dir_item *di; | |
784 | struct btrfs_path *path; | |
785 | struct btrfs_key location; | |
786 | struct inode *inode; | |
73f73415 JB |
787 | u64 dir_id; |
788 | int new = 0; | |
789 | ||
790 | /* | |
791 | * We have a specific subvol we want to mount, just setup location and | |
792 | * go look up the root. | |
793 | */ | |
794 | if (subvol_objectid) { | |
795 | location.objectid = subvol_objectid; | |
796 | location.type = BTRFS_ROOT_ITEM_KEY; | |
797 | location.offset = (u64)-1; | |
798 | goto find_root; | |
799 | } | |
800 | ||
801 | path = btrfs_alloc_path(); | |
802 | if (!path) | |
803 | return ERR_PTR(-ENOMEM); | |
804 | path->leave_spinning = 1; | |
805 | ||
806 | /* | |
807 | * Find the "default" dir item which points to the root item that we | |
808 | * will mount by default if we haven't been given a specific subvolume | |
809 | * to mount. | |
810 | */ | |
815745cf | 811 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 812 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
813 | if (IS_ERR(di)) { |
814 | btrfs_free_path(path); | |
fb4f6f91 | 815 | return ERR_CAST(di); |
b0839166 | 816 | } |
73f73415 JB |
817 | if (!di) { |
818 | /* | |
819 | * Ok the default dir item isn't there. This is weird since | |
820 | * it's always been there, but don't freak out, just try and | |
821 | * mount to root most subvolume. | |
822 | */ | |
823 | btrfs_free_path(path); | |
824 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
815745cf | 825 | new_root = fs_info->fs_root; |
73f73415 JB |
826 | goto setup_root; |
827 | } | |
828 | ||
829 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
830 | btrfs_free_path(path); | |
831 | ||
832 | find_root: | |
815745cf | 833 | new_root = btrfs_read_fs_root_no_name(fs_info, &location); |
73f73415 | 834 | if (IS_ERR(new_root)) |
d0b678cb | 835 | return ERR_CAST(new_root); |
73f73415 | 836 | |
73f73415 JB |
837 | dir_id = btrfs_root_dirid(&new_root->root_item); |
838 | setup_root: | |
839 | location.objectid = dir_id; | |
840 | location.type = BTRFS_INODE_ITEM_KEY; | |
841 | location.offset = 0; | |
842 | ||
843 | inode = btrfs_iget(sb, &location, new_root, &new); | |
4cbd1149 DC |
844 | if (IS_ERR(inode)) |
845 | return ERR_CAST(inode); | |
73f73415 JB |
846 | |
847 | /* | |
848 | * If we're just mounting the root most subvol put the inode and return | |
849 | * a reference to the dentry. We will have already gotten a reference | |
850 | * to the inode in btrfs_fill_super so we're good to go. | |
851 | */ | |
852 | if (!new && sb->s_root->d_inode == inode) { | |
853 | iput(inode); | |
854 | return dget(sb->s_root); | |
855 | } | |
856 | ||
ba5b8958 | 857 | return d_obtain_alias(inode); |
73f73415 JB |
858 | } |
859 | ||
d397712b | 860 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 861 | struct btrfs_fs_devices *fs_devices, |
d397712b | 862 | void *data, int silent) |
75dfe396 | 863 | { |
d397712b | 864 | struct inode *inode; |
815745cf | 865 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 866 | struct btrfs_key key; |
39279cc3 | 867 | int err; |
a429e513 | 868 | |
39279cc3 CM |
869 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
870 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
871 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 872 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 873 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 874 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 875 | sb->s_time_gran = 1; |
0eda294d | 876 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 877 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 878 | #endif |
0c4d2d95 | 879 | sb->s_flags |= MS_I_VERSION; |
ad2b2c80 AV |
880 | err = open_ctree(sb, fs_devices, (char *)data); |
881 | if (err) { | |
39279cc3 | 882 | printk("btrfs: open_ctree failed\n"); |
ad2b2c80 | 883 | return err; |
a429e513 CM |
884 | } |
885 | ||
5d4f98a2 YZ |
886 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
887 | key.type = BTRFS_INODE_ITEM_KEY; | |
888 | key.offset = 0; | |
98c7089c | 889 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
890 | if (IS_ERR(inode)) { |
891 | err = PTR_ERR(inode); | |
39279cc3 | 892 | goto fail_close; |
f254e52c | 893 | } |
f254e52c | 894 | |
48fde701 AV |
895 | sb->s_root = d_make_root(inode); |
896 | if (!sb->s_root) { | |
39279cc3 CM |
897 | err = -ENOMEM; |
898 | goto fail_close; | |
f254e52c | 899 | } |
58176a96 | 900 | |
6885f308 | 901 | save_mount_options(sb, data); |
90a887c9 | 902 | cleancache_init_fs(sb); |
59553edf | 903 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 904 | return 0; |
39279cc3 CM |
905 | |
906 | fail_close: | |
815745cf | 907 | close_ctree(fs_info->tree_root); |
39279cc3 | 908 | return err; |
2619ba1f CM |
909 | } |
910 | ||
6bf13c0c | 911 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
912 | { |
913 | struct btrfs_trans_handle *trans; | |
815745cf AV |
914 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
915 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 916 | |
1abe9b8a | 917 | trace_btrfs_sync_fs(wait); |
918 | ||
39279cc3 | 919 | if (!wait) { |
815745cf | 920 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
921 | return 0; |
922 | } | |
771ed689 | 923 | |
f0de181c | 924 | btrfs_wait_all_ordered_extents(fs_info); |
771ed689 | 925 | |
d4edf39b | 926 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 927 | if (IS_ERR(trans)) { |
354aa0fb MX |
928 | /* no transaction, don't bother */ |
929 | if (PTR_ERR(trans) == -ENOENT) | |
60376ce4 | 930 | return 0; |
98d5dc13 | 931 | return PTR_ERR(trans); |
60376ce4 | 932 | } |
bd7de2c9 | 933 | return btrfs_commit_transaction(trans, root); |
2c90e5d6 CM |
934 | } |
935 | ||
34c80b1d | 936 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 937 | { |
815745cf AV |
938 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
939 | struct btrfs_root *root = info->tree_root; | |
200da64e | 940 | char *compress_type; |
a9572a15 EP |
941 | |
942 | if (btrfs_test_opt(root, DEGRADED)) | |
943 | seq_puts(seq, ",degraded"); | |
944 | if (btrfs_test_opt(root, NODATASUM)) | |
945 | seq_puts(seq, ",nodatasum"); | |
946 | if (btrfs_test_opt(root, NODATACOW)) | |
947 | seq_puts(seq, ",nodatacow"); | |
948 | if (btrfs_test_opt(root, NOBARRIER)) | |
949 | seq_puts(seq, ",nobarrier"); | |
a9572a15 | 950 | if (info->max_inline != 8192 * 1024) |
c1c9ff7c | 951 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
a9572a15 | 952 | if (info->alloc_start != 0) |
c1c9ff7c | 953 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); |
a9572a15 EP |
954 | if (info->thread_pool_size != min_t(unsigned long, |
955 | num_online_cpus() + 2, 8)) | |
956 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
200da64e TI |
957 | if (btrfs_test_opt(root, COMPRESS)) { |
958 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) | |
959 | compress_type = "zlib"; | |
960 | else | |
961 | compress_type = "lzo"; | |
962 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
963 | seq_printf(seq, ",compress-force=%s", compress_type); | |
964 | else | |
965 | seq_printf(seq, ",compress=%s", compress_type); | |
966 | } | |
c289811c CM |
967 | if (btrfs_test_opt(root, NOSSD)) |
968 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
969 | if (btrfs_test_opt(root, SSD_SPREAD)) |
970 | seq_puts(seq, ",ssd_spread"); | |
971 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 972 | seq_puts(seq, ",ssd"); |
3a5e1404 | 973 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 974 | seq_puts(seq, ",notreelog"); |
dccae999 | 975 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 976 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
977 | if (btrfs_test_opt(root, DISCARD)) |
978 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
979 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
980 | seq_puts(seq, ",noacl"); | |
200da64e TI |
981 | if (btrfs_test_opt(root, SPACE_CACHE)) |
982 | seq_puts(seq, ",space_cache"); | |
73bc1876 | 983 | else |
8965593e | 984 | seq_puts(seq, ",nospace_cache"); |
f420ee1e SB |
985 | if (btrfs_test_opt(root, RESCAN_UUID_TREE)) |
986 | seq_puts(seq, ",rescan_uuid_tree"); | |
200da64e TI |
987 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
988 | seq_puts(seq, ",clear_cache"); | |
989 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
990 | seq_puts(seq, ",user_subvol_rm_allowed"); | |
0942caa3 DS |
991 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
992 | seq_puts(seq, ",enospc_debug"); | |
993 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
994 | seq_puts(seq, ",autodefrag"); | |
995 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) | |
996 | seq_puts(seq, ",inode_cache"); | |
9555c6c1 ID |
997 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
998 | seq_puts(seq, ",skip_balance"); | |
8507d216 WS |
999 | if (btrfs_test_opt(root, RECOVERY)) |
1000 | seq_puts(seq, ",recovery"); | |
1001 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
1002 | if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) | |
1003 | seq_puts(seq, ",check_int_data"); | |
1004 | else if (btrfs_test_opt(root, CHECK_INTEGRITY)) | |
1005 | seq_puts(seq, ",check_int"); | |
1006 | if (info->check_integrity_print_mask) | |
1007 | seq_printf(seq, ",check_int_print_mask=%d", | |
1008 | info->check_integrity_print_mask); | |
1009 | #endif | |
1010 | if (info->metadata_ratio) | |
1011 | seq_printf(seq, ",metadata_ratio=%d", | |
1012 | info->metadata_ratio); | |
8c342930 JM |
1013 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
1014 | seq_puts(seq, ",fatal_errors=panic"); | |
8b87dc17 DS |
1015 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
1016 | seq_printf(seq, ",commit=%d", info->commit_interval); | |
a9572a15 EP |
1017 | return 0; |
1018 | } | |
1019 | ||
a061fc8d | 1020 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 1021 | { |
815745cf AV |
1022 | struct btrfs_fs_info *p = data; |
1023 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 1024 | |
815745cf | 1025 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
1026 | } |
1027 | ||
450ba0ea JB |
1028 | static int btrfs_set_super(struct super_block *s, void *data) |
1029 | { | |
6de1d09d AV |
1030 | int err = set_anon_super(s, data); |
1031 | if (!err) | |
1032 | s->s_fs_info = data; | |
1033 | return err; | |
4b82d6e4 Y |
1034 | } |
1035 | ||
f9d9ef62 DS |
1036 | /* |
1037 | * subvolumes are identified by ino 256 | |
1038 | */ | |
1039 | static inline int is_subvolume_inode(struct inode *inode) | |
1040 | { | |
1041 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1042 | return 1; | |
1043 | return 0; | |
1044 | } | |
1045 | ||
830c4adb JB |
1046 | /* |
1047 | * This will strip out the subvol=%s argument for an argument string and add | |
1048 | * subvolid=0 to make sure we get the actual tree root for path walking to the | |
1049 | * subvol we want. | |
1050 | */ | |
1051 | static char *setup_root_args(char *args) | |
1052 | { | |
f60d16a8 JM |
1053 | unsigned len = strlen(args) + 2 + 1; |
1054 | char *src, *dst, *buf; | |
830c4adb JB |
1055 | |
1056 | /* | |
f60d16a8 JM |
1057 | * We need the same args as before, but with this substitution: |
1058 | * s!subvol=[^,]+!subvolid=0! | |
830c4adb | 1059 | * |
f60d16a8 JM |
1060 | * Since the replacement string is up to 2 bytes longer than the |
1061 | * original, allocate strlen(args) + 2 + 1 bytes. | |
830c4adb | 1062 | */ |
830c4adb | 1063 | |
f60d16a8 | 1064 | src = strstr(args, "subvol="); |
830c4adb | 1065 | /* This shouldn't happen, but just in case.. */ |
f60d16a8 JM |
1066 | if (!src) |
1067 | return NULL; | |
1068 | ||
1069 | buf = dst = kmalloc(len, GFP_NOFS); | |
1070 | if (!buf) | |
830c4adb | 1071 | return NULL; |
830c4adb JB |
1072 | |
1073 | /* | |
f60d16a8 JM |
1074 | * If the subvol= arg is not at the start of the string, |
1075 | * copy whatever precedes it into buf. | |
830c4adb | 1076 | */ |
f60d16a8 JM |
1077 | if (src != args) { |
1078 | *src++ = '\0'; | |
1079 | strcpy(buf, args); | |
1080 | dst += strlen(args); | |
830c4adb JB |
1081 | } |
1082 | ||
f60d16a8 JM |
1083 | strcpy(dst, "subvolid=0"); |
1084 | dst += strlen("subvolid=0"); | |
830c4adb JB |
1085 | |
1086 | /* | |
f60d16a8 JM |
1087 | * If there is a "," after the original subvol=... string, |
1088 | * copy that suffix into our buffer. Otherwise, we're done. | |
830c4adb | 1089 | */ |
f60d16a8 JM |
1090 | src = strchr(src, ','); |
1091 | if (src) | |
1092 | strcpy(dst, src); | |
830c4adb | 1093 | |
f60d16a8 | 1094 | return buf; |
830c4adb JB |
1095 | } |
1096 | ||
1097 | static struct dentry *mount_subvol(const char *subvol_name, int flags, | |
1098 | const char *device_name, char *data) | |
1099 | { | |
830c4adb JB |
1100 | struct dentry *root; |
1101 | struct vfsmount *mnt; | |
830c4adb | 1102 | char *newargs; |
830c4adb JB |
1103 | |
1104 | newargs = setup_root_args(data); | |
1105 | if (!newargs) | |
1106 | return ERR_PTR(-ENOMEM); | |
1107 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, | |
1108 | newargs); | |
1109 | kfree(newargs); | |
1110 | if (IS_ERR(mnt)) | |
1111 | return ERR_CAST(mnt); | |
1112 | ||
ea441d11 | 1113 | root = mount_subtree(mnt, subvol_name); |
830c4adb | 1114 | |
ea441d11 AV |
1115 | if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { |
1116 | struct super_block *s = root->d_sb; | |
1117 | dput(root); | |
1118 | root = ERR_PTR(-EINVAL); | |
1119 | deactivate_locked_super(s); | |
f9d9ef62 DS |
1120 | printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n", |
1121 | subvol_name); | |
f9d9ef62 DS |
1122 | } |
1123 | ||
830c4adb JB |
1124 | return root; |
1125 | } | |
450ba0ea | 1126 | |
edf24abe CH |
1127 | /* |
1128 | * Find a superblock for the given device / mount point. | |
1129 | * | |
1130 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1131 | * for multiple device setup. Make sure to keep it in sync. | |
1132 | */ | |
061dbc6b | 1133 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1134 | const char *device_name, void *data) |
4b82d6e4 Y |
1135 | { |
1136 | struct block_device *bdev = NULL; | |
1137 | struct super_block *s; | |
1138 | struct dentry *root; | |
8a4b83cc | 1139 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 1140 | struct btrfs_fs_info *fs_info = NULL; |
97288f2c | 1141 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1142 | char *subvol_name = NULL; |
1143 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
1144 | int error = 0; |
1145 | ||
97288f2c CH |
1146 | if (!(flags & MS_RDONLY)) |
1147 | mode |= FMODE_WRITE; | |
1148 | ||
1149 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 1150 | &subvol_name, &subvol_objectid, |
5e2a4b25 | 1151 | &fs_devices); |
f23c8af8 ID |
1152 | if (error) { |
1153 | kfree(subvol_name); | |
061dbc6b | 1154 | return ERR_PTR(error); |
f23c8af8 | 1155 | } |
edf24abe | 1156 | |
830c4adb JB |
1157 | if (subvol_name) { |
1158 | root = mount_subvol(subvol_name, flags, device_name, data); | |
1159 | kfree(subvol_name); | |
1160 | return root; | |
1161 | } | |
1162 | ||
306e16ce | 1163 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 1164 | if (error) |
830c4adb | 1165 | return ERR_PTR(error); |
4b82d6e4 | 1166 | |
450ba0ea JB |
1167 | /* |
1168 | * Setup a dummy root and fs_info for test/set super. This is because | |
1169 | * we don't actually fill this stuff out until open_ctree, but we need | |
1170 | * it for searching for existing supers, so this lets us do that and | |
1171 | * then open_ctree will properly initialize everything later. | |
1172 | */ | |
1173 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
04d21a24 ID |
1174 | if (!fs_info) |
1175 | return ERR_PTR(-ENOMEM); | |
1176 | ||
450ba0ea | 1177 | fs_info->fs_devices = fs_devices; |
450ba0ea | 1178 | |
6c41761f DS |
1179 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
1180 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
1181 | if (!fs_info->super_copy || !fs_info->super_for_commit) { | |
1182 | error = -ENOMEM; | |
04d21a24 ID |
1183 | goto error_fs_info; |
1184 | } | |
1185 | ||
1186 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1187 | if (error) | |
1188 | goto error_fs_info; | |
1189 | ||
1190 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1191 | error = -EACCES; | |
6c41761f DS |
1192 | goto error_close_devices; |
1193 | } | |
1194 | ||
dfe25020 | 1195 | bdev = fs_devices->latest_bdev; |
9249e17f DH |
1196 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
1197 | fs_info); | |
830c4adb JB |
1198 | if (IS_ERR(s)) { |
1199 | error = PTR_ERR(s); | |
1200 | goto error_close_devices; | |
1201 | } | |
4b82d6e4 Y |
1202 | |
1203 | if (s->s_root) { | |
2b82032c | 1204 | btrfs_close_devices(fs_devices); |
6c41761f | 1205 | free_fs_info(fs_info); |
59553edf AV |
1206 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1207 | error = -EBUSY; | |
4b82d6e4 Y |
1208 | } else { |
1209 | char b[BDEVNAME_SIZE]; | |
1210 | ||
4b82d6e4 | 1211 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
815745cf | 1212 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1213 | error = btrfs_fill_super(s, fs_devices, data, |
1214 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 Y |
1215 | } |
1216 | ||
59553edf AV |
1217 | root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); |
1218 | if (IS_ERR(root)) | |
830c4adb | 1219 | deactivate_locked_super(s); |
4b82d6e4 | 1220 | |
061dbc6b | 1221 | return root; |
4b82d6e4 | 1222 | |
c146afad | 1223 | error_close_devices: |
8a4b83cc | 1224 | btrfs_close_devices(fs_devices); |
04d21a24 | 1225 | error_fs_info: |
6c41761f | 1226 | free_fs_info(fs_info); |
061dbc6b | 1227 | return ERR_PTR(error); |
4b82d6e4 | 1228 | } |
2e635a27 | 1229 | |
0d2450ab ST |
1230 | static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit) |
1231 | { | |
1232 | spin_lock_irq(&workers->lock); | |
1233 | workers->max_workers = new_limit; | |
1234 | spin_unlock_irq(&workers->lock); | |
1235 | } | |
1236 | ||
1237 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, | |
1238 | int new_pool_size, int old_pool_size) | |
1239 | { | |
1240 | if (new_pool_size == old_pool_size) | |
1241 | return; | |
1242 | ||
1243 | fs_info->thread_pool_size = new_pool_size; | |
1244 | ||
1245 | printk(KERN_INFO "btrfs: resize thread pool %d -> %d\n", | |
1246 | old_pool_size, new_pool_size); | |
1247 | ||
1248 | btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size); | |
1249 | btrfs_set_max_workers(&fs_info->workers, new_pool_size); | |
1250 | btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size); | |
1251 | btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size); | |
1252 | btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size); | |
1253 | btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size); | |
1254 | btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size); | |
1255 | btrfs_set_max_workers(&fs_info->endio_meta_workers, new_pool_size); | |
1256 | btrfs_set_max_workers(&fs_info->endio_meta_write_workers, new_pool_size); | |
1257 | btrfs_set_max_workers(&fs_info->endio_write_workers, new_pool_size); | |
1258 | btrfs_set_max_workers(&fs_info->endio_freespace_worker, new_pool_size); | |
1259 | btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size); | |
1260 | btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size); | |
ff023aac SB |
1261 | btrfs_set_max_workers(&fs_info->scrub_wr_completion_workers, |
1262 | new_pool_size); | |
0d2450ab ST |
1263 | } |
1264 | ||
f42a34b2 | 1265 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
dc81cdc5 MX |
1266 | { |
1267 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
f42a34b2 | 1268 | } |
dc81cdc5 | 1269 | |
f42a34b2 MX |
1270 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
1271 | unsigned long old_opts, int flags) | |
1272 | { | |
dc81cdc5 MX |
1273 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1274 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1275 | (flags & MS_RDONLY))) { | |
1276 | /* wait for any defraggers to finish */ | |
1277 | wait_event(fs_info->transaction_wait, | |
1278 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1279 | if (flags & MS_RDONLY) | |
1280 | sync_filesystem(fs_info->sb); | |
1281 | } | |
1282 | } | |
1283 | ||
1284 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1285 | unsigned long old_opts) | |
1286 | { | |
1287 | /* | |
1288 | * We need cleanup all defragable inodes if the autodefragment is | |
1289 | * close or the fs is R/O. | |
1290 | */ | |
1291 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1292 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1293 | (fs_info->sb->s_flags & MS_RDONLY))) { | |
1294 | btrfs_cleanup_defrag_inodes(fs_info); | |
1295 | } | |
1296 | ||
1297 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1298 | } | |
1299 | ||
c146afad YZ |
1300 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1301 | { | |
815745cf AV |
1302 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1303 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1304 | unsigned old_flags = sb->s_flags; |
1305 | unsigned long old_opts = fs_info->mount_opt; | |
1306 | unsigned long old_compress_type = fs_info->compress_type; | |
1307 | u64 old_max_inline = fs_info->max_inline; | |
1308 | u64 old_alloc_start = fs_info->alloc_start; | |
1309 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1310 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
c146afad YZ |
1311 | int ret; |
1312 | ||
f42a34b2 | 1313 | btrfs_remount_prepare(fs_info); |
dc81cdc5 | 1314 | |
b288052e | 1315 | ret = btrfs_parse_options(root, data); |
49b25e05 JM |
1316 | if (ret) { |
1317 | ret = -EINVAL; | |
1318 | goto restore; | |
1319 | } | |
b288052e | 1320 | |
f42a34b2 | 1321 | btrfs_remount_begin(fs_info, old_opts, *flags); |
0d2450ab ST |
1322 | btrfs_resize_thread_pool(fs_info, |
1323 | fs_info->thread_pool_size, old_thread_pool_size); | |
1324 | ||
c146afad | 1325 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
dc81cdc5 | 1326 | goto out; |
c146afad YZ |
1327 | |
1328 | if (*flags & MS_RDONLY) { | |
8dabb742 SB |
1329 | /* |
1330 | * this also happens on 'umount -rf' or on shutdown, when | |
1331 | * the filesystem is busy. | |
1332 | */ | |
c146afad YZ |
1333 | sb->s_flags |= MS_RDONLY; |
1334 | ||
8dabb742 SB |
1335 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1336 | btrfs_scrub_cancel(fs_info); | |
061594ef | 1337 | btrfs_pause_balance(fs_info); |
8dabb742 | 1338 | |
49b25e05 JM |
1339 | ret = btrfs_commit_super(root); |
1340 | if (ret) | |
1341 | goto restore; | |
c146afad | 1342 | } else { |
6ef3de9c DS |
1343 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
1344 | btrfs_err(fs_info, | |
1345 | "Remounting read-write after error is not allowed\n"); | |
1346 | ret = -EINVAL; | |
1347 | goto restore; | |
1348 | } | |
8a3db184 | 1349 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1350 | ret = -EACCES; |
1351 | goto restore; | |
8a3db184 | 1352 | } |
2b82032c | 1353 | |
292fd7fc SB |
1354 | if (fs_info->fs_devices->missing_devices > |
1355 | fs_info->num_tolerated_disk_barrier_failures && | |
1356 | !(*flags & MS_RDONLY)) { | |
1357 | printk(KERN_WARNING | |
1358 | "Btrfs: too many missing devices, writeable remount is not allowed\n"); | |
1359 | ret = -EACCES; | |
1360 | goto restore; | |
1361 | } | |
1362 | ||
8a3db184 | 1363 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1364 | ret = -EINVAL; |
1365 | goto restore; | |
8a3db184 | 1366 | } |
c146afad | 1367 | |
815745cf | 1368 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1369 | if (ret) |
1370 | goto restore; | |
c146afad | 1371 | |
d68fc57b YZ |
1372 | /* recover relocation */ |
1373 | ret = btrfs_recover_relocation(root); | |
49b25e05 JM |
1374 | if (ret) |
1375 | goto restore; | |
c146afad | 1376 | |
2b6ba629 ID |
1377 | ret = btrfs_resume_balance_async(fs_info); |
1378 | if (ret) | |
1379 | goto restore; | |
1380 | ||
8dabb742 SB |
1381 | ret = btrfs_resume_dev_replace_async(fs_info); |
1382 | if (ret) { | |
1383 | pr_warn("btrfs: failed to resume dev_replace\n"); | |
1384 | goto restore; | |
1385 | } | |
94aebfb2 JB |
1386 | |
1387 | if (!fs_info->uuid_root) { | |
1388 | pr_info("btrfs: creating UUID tree\n"); | |
1389 | ret = btrfs_create_uuid_tree(fs_info); | |
1390 | if (ret) { | |
1391 | pr_warn("btrfs: failed to create the uuid tree" | |
1392 | "%d\n", ret); | |
1393 | goto restore; | |
1394 | } | |
1395 | } | |
c146afad YZ |
1396 | sb->s_flags &= ~MS_RDONLY; |
1397 | } | |
dc81cdc5 MX |
1398 | out: |
1399 | btrfs_remount_cleanup(fs_info, old_opts); | |
c146afad | 1400 | return 0; |
49b25e05 JM |
1401 | |
1402 | restore: | |
1403 | /* We've hit an error - don't reset MS_RDONLY */ | |
1404 | if (sb->s_flags & MS_RDONLY) | |
1405 | old_flags |= MS_RDONLY; | |
1406 | sb->s_flags = old_flags; | |
1407 | fs_info->mount_opt = old_opts; | |
1408 | fs_info->compress_type = old_compress_type; | |
1409 | fs_info->max_inline = old_max_inline; | |
c018daec | 1410 | mutex_lock(&fs_info->chunk_mutex); |
49b25e05 | 1411 | fs_info->alloc_start = old_alloc_start; |
c018daec | 1412 | mutex_unlock(&fs_info->chunk_mutex); |
0d2450ab ST |
1413 | btrfs_resize_thread_pool(fs_info, |
1414 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 | 1415 | fs_info->metadata_ratio = old_metadata_ratio; |
dc81cdc5 | 1416 | btrfs_remount_cleanup(fs_info, old_opts); |
49b25e05 | 1417 | return ret; |
c146afad YZ |
1418 | } |
1419 | ||
bcd53741 AJ |
1420 | /* Used to sort the devices by max_avail(descending sort) */ |
1421 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1422 | const void *dev_info2) | |
1423 | { | |
1424 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1425 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1426 | return -1; | |
1427 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1428 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1429 | return 1; | |
1430 | else | |
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | /* | |
1435 | * sort the devices by max_avail, in which max free extent size of each device | |
1436 | * is stored.(Descending Sort) | |
1437 | */ | |
1438 | static inline void btrfs_descending_sort_devices( | |
1439 | struct btrfs_device_info *devices, | |
1440 | size_t nr_devices) | |
1441 | { | |
1442 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1443 | btrfs_cmp_device_free_bytes, NULL); | |
1444 | } | |
1445 | ||
6d07bcec MX |
1446 | /* |
1447 | * The helper to calc the free space on the devices that can be used to store | |
1448 | * file data. | |
1449 | */ | |
1450 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1451 | { | |
1452 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1453 | struct btrfs_device_info *devices_info; | |
1454 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1455 | struct btrfs_device *device; | |
1456 | u64 skip_space; | |
1457 | u64 type; | |
1458 | u64 avail_space; | |
1459 | u64 used_space; | |
1460 | u64 min_stripe_size; | |
39fb26c3 | 1461 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1462 | int i = 0, nr_devices; |
1463 | int ret; | |
1464 | ||
b772a86e | 1465 | nr_devices = fs_info->fs_devices->open_devices; |
6d07bcec MX |
1466 | BUG_ON(!nr_devices); |
1467 | ||
1468 | devices_info = kmalloc(sizeof(*devices_info) * nr_devices, | |
1469 | GFP_NOFS); | |
1470 | if (!devices_info) | |
1471 | return -ENOMEM; | |
1472 | ||
1473 | /* calc min stripe number for data space alloction */ | |
1474 | type = btrfs_get_alloc_profile(root, 1); | |
39fb26c3 | 1475 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1476 | min_stripes = 2; |
39fb26c3 MX |
1477 | num_stripes = nr_devices; |
1478 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1479 | min_stripes = 2; |
39fb26c3 MX |
1480 | num_stripes = 2; |
1481 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1482 | min_stripes = 4; |
39fb26c3 MX |
1483 | num_stripes = 4; |
1484 | } | |
6d07bcec MX |
1485 | |
1486 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1487 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1488 | else | |
1489 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1490 | ||
b772a86e | 1491 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
63a212ab SB |
1492 | if (!device->in_fs_metadata || !device->bdev || |
1493 | device->is_tgtdev_for_dev_replace) | |
6d07bcec MX |
1494 | continue; |
1495 | ||
1496 | avail_space = device->total_bytes - device->bytes_used; | |
1497 | ||
1498 | /* align with stripe_len */ | |
1499 | do_div(avail_space, BTRFS_STRIPE_LEN); | |
1500 | avail_space *= BTRFS_STRIPE_LEN; | |
1501 | ||
1502 | /* | |
1503 | * In order to avoid overwritting the superblock on the drive, | |
1504 | * btrfs starts at an offset of at least 1MB when doing chunk | |
1505 | * allocation. | |
1506 | */ | |
1507 | skip_space = 1024 * 1024; | |
1508 | ||
1509 | /* user can set the offset in fs_info->alloc_start. */ | |
1510 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1511 | device->total_bytes) | |
1512 | skip_space = max(fs_info->alloc_start, skip_space); | |
1513 | ||
1514 | /* | |
1515 | * btrfs can not use the free space in [0, skip_space - 1], | |
1516 | * we must subtract it from the total. In order to implement | |
1517 | * it, we account the used space in this range first. | |
1518 | */ | |
1519 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, | |
1520 | &used_space); | |
1521 | if (ret) { | |
1522 | kfree(devices_info); | |
1523 | return ret; | |
1524 | } | |
1525 | ||
1526 | /* calc the free space in [0, skip_space - 1] */ | |
1527 | skip_space -= used_space; | |
1528 | ||
1529 | /* | |
1530 | * we can use the free space in [0, skip_space - 1], subtract | |
1531 | * it from the total. | |
1532 | */ | |
1533 | if (avail_space && avail_space >= skip_space) | |
1534 | avail_space -= skip_space; | |
1535 | else | |
1536 | avail_space = 0; | |
1537 | ||
1538 | if (avail_space < min_stripe_size) | |
1539 | continue; | |
1540 | ||
1541 | devices_info[i].dev = device; | |
1542 | devices_info[i].max_avail = avail_space; | |
1543 | ||
1544 | i++; | |
1545 | } | |
1546 | ||
1547 | nr_devices = i; | |
1548 | ||
1549 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1550 | ||
1551 | i = nr_devices - 1; | |
1552 | avail_space = 0; | |
1553 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
1554 | if (num_stripes > nr_devices) |
1555 | num_stripes = nr_devices; | |
1556 | ||
6d07bcec MX |
1557 | if (devices_info[i].max_avail >= min_stripe_size) { |
1558 | int j; | |
1559 | u64 alloc_size; | |
1560 | ||
39fb26c3 | 1561 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 1562 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 1563 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
1564 | devices_info[j].max_avail -= alloc_size; |
1565 | } | |
1566 | i--; | |
1567 | nr_devices--; | |
1568 | } | |
1569 | ||
1570 | kfree(devices_info); | |
1571 | *free_bytes = avail_space; | |
1572 | return 0; | |
1573 | } | |
1574 | ||
8fd17795 CM |
1575 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1576 | { | |
815745cf AV |
1577 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
1578 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
1579 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
1580 | struct btrfs_space_info *found; |
1581 | u64 total_used = 0; | |
6d07bcec | 1582 | u64 total_free_data = 0; |
db94535d | 1583 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 1584 | __be32 *fsid = (__be32 *)fs_info->fsid; |
6d07bcec | 1585 | int ret; |
8fd17795 | 1586 | |
6d07bcec | 1587 | /* holding chunk_muext to avoid allocating new chunks */ |
815745cf | 1588 | mutex_lock(&fs_info->chunk_mutex); |
bd4d1088 | 1589 | rcu_read_lock(); |
89a55897 | 1590 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec MX |
1591 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
1592 | total_free_data += found->disk_total - found->disk_used; | |
1593 | total_free_data -= | |
1594 | btrfs_account_ro_block_groups_free_space(found); | |
1595 | } | |
1596 | ||
b742bb82 | 1597 | total_used += found->disk_used; |
89a55897 | 1598 | } |
bd4d1088 JB |
1599 | rcu_read_unlock(); |
1600 | ||
8fd17795 | 1601 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 1602 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 | 1603 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
8fd17795 CM |
1604 | buf->f_bsize = dentry->d_sb->s_blocksize; |
1605 | buf->f_type = BTRFS_SUPER_MAGIC; | |
6d07bcec | 1606 | buf->f_bavail = total_free_data; |
815745cf | 1607 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
6d07bcec | 1608 | if (ret) { |
815745cf | 1609 | mutex_unlock(&fs_info->chunk_mutex); |
6d07bcec MX |
1610 | return ret; |
1611 | } | |
1612 | buf->f_bavail += total_free_data; | |
1613 | buf->f_bavail = buf->f_bavail >> bits; | |
815745cf | 1614 | mutex_unlock(&fs_info->chunk_mutex); |
d397712b | 1615 | |
9d03632e | 1616 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 1617 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
1618 | on a big-endian or little-endian host */ |
1619 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
1620 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
1621 | /* Mask in the root object ID too, to disambiguate subvols */ |
1622 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
1623 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
1624 | ||
8fd17795 CM |
1625 | return 0; |
1626 | } | |
b5133862 | 1627 | |
aea52e19 AV |
1628 | static void btrfs_kill_super(struct super_block *sb) |
1629 | { | |
815745cf | 1630 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 1631 | kill_anon_super(sb); |
d22ca7de | 1632 | free_fs_info(fs_info); |
aea52e19 AV |
1633 | } |
1634 | ||
2e635a27 CM |
1635 | static struct file_system_type btrfs_fs_type = { |
1636 | .owner = THIS_MODULE, | |
1637 | .name = "btrfs", | |
061dbc6b | 1638 | .mount = btrfs_mount, |
aea52e19 | 1639 | .kill_sb = btrfs_kill_super, |
2e635a27 CM |
1640 | .fs_flags = FS_REQUIRES_DEV, |
1641 | }; | |
7f78e035 | 1642 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 1643 | |
d352ac68 CM |
1644 | /* |
1645 | * used by btrfsctl to scan devices when no FS is mounted | |
1646 | */ | |
8a4b83cc CM |
1647 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
1648 | unsigned long arg) | |
1649 | { | |
1650 | struct btrfs_ioctl_vol_args *vol; | |
1651 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 1652 | int ret = -ENOTTY; |
8a4b83cc | 1653 | |
e441d54d CM |
1654 | if (!capable(CAP_SYS_ADMIN)) |
1655 | return -EPERM; | |
1656 | ||
dae7b665 LZ |
1657 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
1658 | if (IS_ERR(vol)) | |
1659 | return PTR_ERR(vol); | |
c071fcfd | 1660 | |
8a4b83cc CM |
1661 | switch (cmd) { |
1662 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 1663 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
1664 | &btrfs_fs_type, &fs_devices); |
1665 | break; | |
02db0844 JB |
1666 | case BTRFS_IOC_DEVICES_READY: |
1667 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
1668 | &btrfs_fs_type, &fs_devices); | |
1669 | if (ret) | |
1670 | break; | |
1671 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
1672 | break; | |
8a4b83cc | 1673 | } |
dae7b665 | 1674 | |
8a4b83cc | 1675 | kfree(vol); |
f819d837 | 1676 | return ret; |
8a4b83cc CM |
1677 | } |
1678 | ||
0176260f | 1679 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 1680 | { |
354aa0fb MX |
1681 | struct btrfs_trans_handle *trans; |
1682 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
1683 | ||
d4edf39b | 1684 | trans = btrfs_attach_transaction_barrier(root); |
354aa0fb MX |
1685 | if (IS_ERR(trans)) { |
1686 | /* no transaction, don't bother */ | |
1687 | if (PTR_ERR(trans) == -ENOENT) | |
1688 | return 0; | |
1689 | return PTR_ERR(trans); | |
1690 | } | |
1691 | return btrfs_commit_transaction(trans, root); | |
ed0dab6b Y |
1692 | } |
1693 | ||
0176260f | 1694 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b | 1695 | { |
0176260f | 1696 | return 0; |
ed0dab6b | 1697 | } |
2e635a27 | 1698 | |
9c5085c1 JB |
1699 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
1700 | { | |
1701 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
1702 | struct btrfs_fs_devices *cur_devices; | |
1703 | struct btrfs_device *dev, *first_dev = NULL; | |
1704 | struct list_head *head; | |
1705 | struct rcu_string *name; | |
1706 | ||
1707 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
1708 | cur_devices = fs_info->fs_devices; | |
1709 | while (cur_devices) { | |
1710 | head = &cur_devices->devices; | |
1711 | list_for_each_entry(dev, head, dev_list) { | |
aa9ddcd4 JB |
1712 | if (dev->missing) |
1713 | continue; | |
9c5085c1 JB |
1714 | if (!first_dev || dev->devid < first_dev->devid) |
1715 | first_dev = dev; | |
1716 | } | |
1717 | cur_devices = cur_devices->seed; | |
1718 | } | |
1719 | ||
1720 | if (first_dev) { | |
1721 | rcu_read_lock(); | |
1722 | name = rcu_dereference(first_dev->name); | |
1723 | seq_escape(m, name->str, " \t\n\\"); | |
1724 | rcu_read_unlock(); | |
1725 | } else { | |
1726 | WARN_ON(1); | |
1727 | } | |
1728 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
1729 | return 0; | |
1730 | } | |
1731 | ||
b87221de | 1732 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 1733 | .drop_inode = btrfs_drop_inode, |
bd555975 | 1734 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 1735 | .put_super = btrfs_put_super, |
d5719762 | 1736 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 1737 | .show_options = btrfs_show_options, |
9c5085c1 | 1738 | .show_devname = btrfs_show_devname, |
4730a4bc | 1739 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
1740 | .alloc_inode = btrfs_alloc_inode, |
1741 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 1742 | .statfs = btrfs_statfs, |
c146afad | 1743 | .remount_fs = btrfs_remount, |
0176260f LT |
1744 | .freeze_fs = btrfs_freeze, |
1745 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 1746 | }; |
a9218f6b CM |
1747 | |
1748 | static const struct file_operations btrfs_ctl_fops = { | |
1749 | .unlocked_ioctl = btrfs_control_ioctl, | |
1750 | .compat_ioctl = btrfs_control_ioctl, | |
1751 | .owner = THIS_MODULE, | |
6038f373 | 1752 | .llseek = noop_llseek, |
a9218f6b CM |
1753 | }; |
1754 | ||
1755 | static struct miscdevice btrfs_misc = { | |
578454ff | 1756 | .minor = BTRFS_MINOR, |
a9218f6b CM |
1757 | .name = "btrfs-control", |
1758 | .fops = &btrfs_ctl_fops | |
1759 | }; | |
1760 | ||
578454ff KS |
1761 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
1762 | MODULE_ALIAS("devname:btrfs-control"); | |
1763 | ||
a9218f6b CM |
1764 | static int btrfs_interface_init(void) |
1765 | { | |
1766 | return misc_register(&btrfs_misc); | |
1767 | } | |
1768 | ||
b2950863 | 1769 | static void btrfs_interface_exit(void) |
a9218f6b CM |
1770 | { |
1771 | if (misc_deregister(&btrfs_misc) < 0) | |
48940662 | 1772 | printk(KERN_INFO "btrfs: misc_deregister failed for control device\n"); |
a9218f6b CM |
1773 | } |
1774 | ||
85965600 DS |
1775 | static void btrfs_print_info(void) |
1776 | { | |
1777 | printk(KERN_INFO "Btrfs loaded" | |
1778 | #ifdef CONFIG_BTRFS_DEBUG | |
1779 | ", debug=on" | |
1780 | #endif | |
79556c3d SB |
1781 | #ifdef CONFIG_BTRFS_ASSERT |
1782 | ", assert=on" | |
1783 | #endif | |
85965600 DS |
1784 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
1785 | ", integrity-checker=on" | |
1786 | #endif | |
1787 | "\n"); | |
1788 | } | |
1789 | ||
dc11dd5d JB |
1790 | static int btrfs_run_sanity_tests(void) |
1791 | { | |
1792 | return btrfs_test_free_space_cache(); | |
1793 | } | |
1794 | ||
2e635a27 CM |
1795 | static int __init init_btrfs_fs(void) |
1796 | { | |
2c90e5d6 | 1797 | int err; |
58176a96 JB |
1798 | |
1799 | err = btrfs_init_sysfs(); | |
1800 | if (err) | |
1801 | return err; | |
1802 | ||
143bede5 | 1803 | btrfs_init_compress(); |
d1310b2e | 1804 | |
261507a0 LZ |
1805 | err = btrfs_init_cachep(); |
1806 | if (err) | |
1807 | goto free_compress; | |
1808 | ||
d1310b2e | 1809 | err = extent_io_init(); |
2f4cbe64 WB |
1810 | if (err) |
1811 | goto free_cachep; | |
1812 | ||
d1310b2e CM |
1813 | err = extent_map_init(); |
1814 | if (err) | |
1815 | goto free_extent_io; | |
1816 | ||
6352b91d | 1817 | err = ordered_data_init(); |
2f4cbe64 WB |
1818 | if (err) |
1819 | goto free_extent_map; | |
c8b97818 | 1820 | |
6352b91d MX |
1821 | err = btrfs_delayed_inode_init(); |
1822 | if (err) | |
1823 | goto free_ordered_data; | |
1824 | ||
9247f317 | 1825 | err = btrfs_auto_defrag_init(); |
16cdcec7 MX |
1826 | if (err) |
1827 | goto free_delayed_inode; | |
1828 | ||
78a6184a | 1829 | err = btrfs_delayed_ref_init(); |
9247f317 MX |
1830 | if (err) |
1831 | goto free_auto_defrag; | |
1832 | ||
b9e9a6cb WS |
1833 | err = btrfs_prelim_ref_init(); |
1834 | if (err) | |
1835 | goto free_prelim_ref; | |
1836 | ||
78a6184a MX |
1837 | err = btrfs_interface_init(); |
1838 | if (err) | |
1839 | goto free_delayed_ref; | |
1840 | ||
e565d4b9 JS |
1841 | btrfs_init_lockdep(); |
1842 | ||
85965600 | 1843 | btrfs_print_info(); |
dc11dd5d JB |
1844 | |
1845 | err = btrfs_run_sanity_tests(); | |
1846 | if (err) | |
1847 | goto unregister_ioctl; | |
1848 | ||
1849 | err = register_filesystem(&btrfs_fs_type); | |
1850 | if (err) | |
1851 | goto unregister_ioctl; | |
74255aa0 | 1852 | |
2f4cbe64 WB |
1853 | return 0; |
1854 | ||
a9218f6b CM |
1855 | unregister_ioctl: |
1856 | btrfs_interface_exit(); | |
b9e9a6cb WS |
1857 | free_prelim_ref: |
1858 | btrfs_prelim_ref_exit(); | |
78a6184a MX |
1859 | free_delayed_ref: |
1860 | btrfs_delayed_ref_exit(); | |
9247f317 MX |
1861 | free_auto_defrag: |
1862 | btrfs_auto_defrag_exit(); | |
16cdcec7 MX |
1863 | free_delayed_inode: |
1864 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
1865 | free_ordered_data: |
1866 | ordered_data_exit(); | |
2f4cbe64 WB |
1867 | free_extent_map: |
1868 | extent_map_exit(); | |
d1310b2e CM |
1869 | free_extent_io: |
1870 | extent_io_exit(); | |
2f4cbe64 WB |
1871 | free_cachep: |
1872 | btrfs_destroy_cachep(); | |
261507a0 LZ |
1873 | free_compress: |
1874 | btrfs_exit_compress(); | |
2f4cbe64 WB |
1875 | btrfs_exit_sysfs(); |
1876 | return err; | |
2e635a27 CM |
1877 | } |
1878 | ||
1879 | static void __exit exit_btrfs_fs(void) | |
1880 | { | |
39279cc3 | 1881 | btrfs_destroy_cachep(); |
78a6184a | 1882 | btrfs_delayed_ref_exit(); |
9247f317 | 1883 | btrfs_auto_defrag_exit(); |
16cdcec7 | 1884 | btrfs_delayed_inode_exit(); |
b9e9a6cb | 1885 | btrfs_prelim_ref_exit(); |
6352b91d | 1886 | ordered_data_exit(); |
a52d9a80 | 1887 | extent_map_exit(); |
d1310b2e | 1888 | extent_io_exit(); |
a9218f6b | 1889 | btrfs_interface_exit(); |
2e635a27 | 1890 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 1891 | btrfs_exit_sysfs(); |
8a4b83cc | 1892 | btrfs_cleanup_fs_uuids(); |
261507a0 | 1893 | btrfs_exit_compress(); |
2e635a27 CM |
1894 | } |
1895 | ||
1896 | module_init(init_btrfs_fs) | |
1897 | module_exit(exit_btrfs_fs) | |
1898 | ||
1899 | MODULE_LICENSE("GPL"); |