Commit | Line | Data |
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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> |
16cdcec7 | 45 | #include "delayed-inode.h" |
2e635a27 | 46 | #include "ctree.h" |
e20d96d6 | 47 | #include "disk-io.h" |
d5719762 | 48 | #include "transaction.h" |
2c90e5d6 | 49 | #include "btrfs_inode.h" |
3a686375 | 50 | #include "print-tree.h" |
5103e947 | 51 | #include "xattr.h" |
8a4b83cc | 52 | #include "volumes.h" |
be6e8dc0 | 53 | #include "export.h" |
c8b97818 | 54 | #include "compression.h" |
9c5085c1 | 55 | #include "rcu-string.h" |
8dabb742 | 56 | #include "dev-replace.h" |
74255aa0 | 57 | #include "free-space-cache.h" |
b9e9a6cb | 58 | #include "backref.h" |
dc11dd5d | 59 | #include "tests/btrfs-tests.h" |
2e635a27 | 60 | |
1abe9b8a | 61 | #define CREATE_TRACE_POINTS |
62 | #include <trace/events/btrfs.h> | |
63 | ||
b87221de | 64 | static const struct super_operations btrfs_super_ops; |
830c4adb | 65 | static struct file_system_type btrfs_fs_type; |
75dfe396 | 66 | |
08748810 | 67 | static const char *btrfs_decode_error(int errno) |
acce952b | 68 | { |
08748810 | 69 | char *errstr = "unknown"; |
acce952b | 70 | |
71 | switch (errno) { | |
72 | case -EIO: | |
73 | errstr = "IO failure"; | |
74 | break; | |
75 | case -ENOMEM: | |
76 | errstr = "Out of memory"; | |
77 | break; | |
78 | case -EROFS: | |
79 | errstr = "Readonly filesystem"; | |
80 | break; | |
8c342930 JM |
81 | case -EEXIST: |
82 | errstr = "Object already exists"; | |
83 | break; | |
94ef7280 DS |
84 | case -ENOSPC: |
85 | errstr = "No space left"; | |
86 | break; | |
87 | case -ENOENT: | |
88 | errstr = "No such entry"; | |
89 | break; | |
acce952b | 90 | } |
91 | ||
92 | return errstr; | |
93 | } | |
94 | ||
bbece8a3 | 95 | static void save_error_info(struct btrfs_fs_info *fs_info) |
acce952b | 96 | { |
97 | /* | |
98 | * today we only save the error info into ram. Long term we'll | |
99 | * also send it down to the disk | |
100 | */ | |
87533c47 | 101 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); |
acce952b | 102 | } |
103 | ||
acce952b | 104 | /* btrfs handle error by forcing the filesystem readonly */ |
105 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) | |
106 | { | |
107 | struct super_block *sb = fs_info->sb; | |
108 | ||
109 | if (sb->s_flags & MS_RDONLY) | |
110 | return; | |
111 | ||
87533c47 | 112 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
acce952b | 113 | sb->s_flags |= MS_RDONLY; |
c2cf52eb | 114 | btrfs_info(fs_info, "forced readonly"); |
1acd6831 SB |
115 | /* |
116 | * Note that a running device replace operation is not | |
117 | * canceled here although there is no way to update | |
118 | * the progress. It would add the risk of a deadlock, | |
119 | * therefore the canceling is ommited. The only penalty | |
120 | * is that some I/O remains active until the procedure | |
121 | * completes. The next time when the filesystem is | |
122 | * mounted writeable again, the device replace | |
123 | * operation continues. | |
124 | */ | |
acce952b | 125 | } |
126 | } | |
127 | ||
533574c6 | 128 | #ifdef CONFIG_PRINTK |
acce952b | 129 | /* |
130 | * __btrfs_std_error decodes expected errors from the caller and | |
131 | * invokes the approciate error response. | |
132 | */ | |
133 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
4da35113 | 134 | unsigned int line, int errno, const char *fmt, ...) |
acce952b | 135 | { |
136 | struct super_block *sb = fs_info->sb; | |
acce952b | 137 | const char *errstr; |
138 | ||
139 | /* | |
140 | * Special case: if the error is EROFS, and we're already | |
141 | * under MS_RDONLY, then it is safe here. | |
142 | */ | |
143 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
4da35113 JM |
144 | return; |
145 | ||
08748810 | 146 | errstr = btrfs_decode_error(errno); |
4da35113 | 147 | if (fmt) { |
37252a66 ES |
148 | struct va_format vaf; |
149 | va_list args; | |
150 | ||
151 | va_start(args, fmt); | |
152 | vaf.fmt = fmt; | |
153 | vaf.va = &args; | |
4da35113 | 154 | |
efe120a0 FH |
155 | printk(KERN_CRIT |
156 | "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", | |
08748810 | 157 | sb->s_id, function, line, errno, errstr, &vaf); |
37252a66 | 158 | va_end(args); |
4da35113 | 159 | } else { |
efe120a0 | 160 | printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", |
08748810 | 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)) { | |
efe120a0 | 254 | WARN(1, KERN_DEBUG "BTRFS: Transaction aborted (error %d)\n", |
08748810 DS |
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 | |
efe120a0 FH |
298 | btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", |
299 | 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, |
e07a2ade | 326 | Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, |
bd0330ad | 327 | Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, |
9555c6c1 | 328 | Opt_err, |
95e05289 CM |
329 | }; |
330 | ||
331 | static match_table_t tokens = { | |
dfe25020 | 332 | {Opt_degraded, "degraded"}, |
95e05289 | 333 | {Opt_subvol, "subvol=%s"}, |
1493381f | 334 | {Opt_subvolid, "subvolid=%s"}, |
43e570b0 | 335 | {Opt_device, "device=%s"}, |
b6cda9bc | 336 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 337 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 338 | {Opt_nobarrier, "nobarrier"}, |
842bef58 | 339 | {Opt_barrier, "barrier"}, |
6f568d35 | 340 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 341 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 342 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 343 | {Opt_compress, "compress"}, |
261507a0 | 344 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 345 | {Opt_compress_force, "compress-force"}, |
261507a0 | 346 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 347 | {Opt_ssd, "ssd"}, |
451d7585 | 348 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 349 | {Opt_nossd, "nossd"}, |
bd0330ad | 350 | {Opt_acl, "acl"}, |
33268eaf | 351 | {Opt_noacl, "noacl"}, |
3a5e1404 | 352 | {Opt_notreelog, "notreelog"}, |
dccae999 | 353 | {Opt_flushoncommit, "flushoncommit"}, |
2c9ee856 | 354 | {Opt_noflushoncommit, "noflushoncommit"}, |
97e728d4 | 355 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 356 | {Opt_discard, "discard"}, |
e07a2ade | 357 | {Opt_nodiscard, "nodiscard"}, |
0af3d00b | 358 | {Opt_space_cache, "space_cache"}, |
88c2ba3b | 359 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 360 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 361 | {Opt_enospc_debug, "enospc_debug"}, |
53036293 | 362 | {Opt_noenospc_debug, "noenospc_debug"}, |
e15d0542 | 363 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 364 | {Opt_defrag, "autodefrag"}, |
fc0ca9af | 365 | {Opt_nodefrag, "noautodefrag"}, |
4b9465cb | 366 | {Opt_inode_cache, "inode_cache"}, |
8965593e | 367 | {Opt_no_space_cache, "nospace_cache"}, |
af31f5e5 | 368 | {Opt_recovery, "recovery"}, |
9555c6c1 | 369 | {Opt_skip_balance, "skip_balance"}, |
21adbd5c SB |
370 | {Opt_check_integrity, "check_int"}, |
371 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
372 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, | |
f420ee1e | 373 | {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, |
8c342930 | 374 | {Opt_fatal_errors, "fatal_errors=%s"}, |
8b87dc17 | 375 | {Opt_commit_interval, "commit=%d"}, |
33268eaf | 376 | {Opt_err, NULL}, |
95e05289 CM |
377 | }; |
378 | ||
edf24abe CH |
379 | /* |
380 | * Regular mount options parser. Everything that is needed only when | |
381 | * reading in a new superblock is parsed here. | |
49b25e05 | 382 | * XXX JDM: This needs to be cleaned up for remount. |
edf24abe CH |
383 | */ |
384 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 385 | { |
edf24abe | 386 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 387 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
388 | char *p, *num, *orig = NULL; |
389 | u64 cache_gen; | |
4543df7e | 390 | int intarg; |
a7a3f7ca | 391 | int ret = 0; |
261507a0 LZ |
392 | char *compress_type; |
393 | bool compress_force = false; | |
b6cda9bc | 394 | |
6c41761f | 395 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 JB |
396 | if (cache_gen) |
397 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); | |
398 | ||
95e05289 | 399 | if (!options) |
73bc1876 | 400 | goto out; |
95e05289 | 401 | |
be20aa9d CM |
402 | /* |
403 | * strsep changes the string, duplicate it because parse_options | |
404 | * gets called twice | |
405 | */ | |
406 | options = kstrdup(options, GFP_NOFS); | |
407 | if (!options) | |
408 | return -ENOMEM; | |
409 | ||
da495ecc | 410 | orig = options; |
be20aa9d | 411 | |
edf24abe | 412 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
413 | int token; |
414 | if (!*p) | |
415 | continue; | |
416 | ||
417 | token = match_token(p, tokens, args); | |
418 | switch (token) { | |
dfe25020 | 419 | case Opt_degraded: |
efe120a0 | 420 | btrfs_info(root->fs_info, "allowing degraded mounts"); |
edf24abe | 421 | btrfs_set_opt(info->mount_opt, DEGRADED); |
dfe25020 | 422 | break; |
95e05289 | 423 | case Opt_subvol: |
73f73415 | 424 | case Opt_subvolid: |
e15d0542 | 425 | case Opt_subvolrootid: |
43e570b0 | 426 | case Opt_device: |
edf24abe | 427 | /* |
43e570b0 | 428 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
429 | * and can be happily ignored here. |
430 | */ | |
b6cda9bc CM |
431 | break; |
432 | case Opt_nodatasum: | |
efe120a0 | 433 | btrfs_info(root->fs_info, "setting nodatasum"); |
edf24abe | 434 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
435 | break; |
436 | case Opt_nodatacow: | |
bedb2cca AP |
437 | if (!btrfs_test_opt(root, COMPRESS) || |
438 | !btrfs_test_opt(root, FORCE_COMPRESS)) { | |
efe120a0 FH |
439 | btrfs_info(root->fs_info, |
440 | "setting nodatacow, compression disabled"); | |
bedb2cca | 441 | } else { |
efe120a0 | 442 | btrfs_info(root->fs_info, "setting nodatacow"); |
bedb2cca | 443 | } |
bedb2cca AP |
444 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
445 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
edf24abe CH |
446 | btrfs_set_opt(info->mount_opt, NODATACOW); |
447 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 448 | break; |
a555f810 | 449 | case Opt_compress_force: |
261507a0 LZ |
450 | case Opt_compress_force_type: |
451 | compress_force = true; | |
1c697d4a | 452 | /* Fallthrough */ |
261507a0 LZ |
453 | case Opt_compress: |
454 | case Opt_compress_type: | |
455 | if (token == Opt_compress || | |
456 | token == Opt_compress_force || | |
457 | strcmp(args[0].from, "zlib") == 0) { | |
458 | compress_type = "zlib"; | |
459 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
063849ea | 460 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
461 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
462 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
a6fa6fae LZ |
463 | } else if (strcmp(args[0].from, "lzo") == 0) { |
464 | compress_type = "lzo"; | |
465 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 466 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
467 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
468 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
2b0ce2c2 | 469 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
063849ea AH |
470 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
471 | compress_type = "no"; | |
063849ea AH |
472 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
473 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
474 | compress_force = false; | |
261507a0 LZ |
475 | } else { |
476 | ret = -EINVAL; | |
477 | goto out; | |
478 | } | |
479 | ||
261507a0 LZ |
480 | if (compress_force) { |
481 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
efe120a0 | 482 | btrfs_info(root->fs_info, "force %s compression", |
261507a0 | 483 | compress_type); |
a7e252af | 484 | } else if (btrfs_test_opt(root, COMPRESS)) { |
261507a0 LZ |
485 | pr_info("btrfs: use %s compression\n", |
486 | compress_type); | |
a7e252af | 487 | } |
a555f810 | 488 | break; |
e18e4809 | 489 | case Opt_ssd: |
efe120a0 | 490 | btrfs_info(root->fs_info, "use ssd allocation scheme"); |
edf24abe | 491 | btrfs_set_opt(info->mount_opt, SSD); |
e18e4809 | 492 | break; |
451d7585 | 493 | case Opt_ssd_spread: |
efe120a0 | 494 | btrfs_info(root->fs_info, "use spread ssd allocation scheme"); |
451d7585 CM |
495 | btrfs_set_opt(info->mount_opt, SSD); |
496 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
497 | break; | |
3b30c22f | 498 | case Opt_nossd: |
efe120a0 | 499 | btrfs_info(root->fs_info, "not using ssd allocation scheme"); |
c289811c | 500 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 501 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 502 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 503 | break; |
842bef58 QW |
504 | case Opt_barrier: |
505 | if (btrfs_test_opt(root, NOBARRIER)) | |
506 | btrfs_info(root->fs_info, "turning on barriers"); | |
507 | btrfs_clear_opt(info->mount_opt, NOBARRIER); | |
508 | break; | |
21ad10cf | 509 | case Opt_nobarrier: |
efe120a0 | 510 | btrfs_info(root->fs_info, "turning off barriers"); |
edf24abe | 511 | btrfs_set_opt(info->mount_opt, NOBARRIER); |
21ad10cf | 512 | break; |
4543df7e | 513 | case Opt_thread_pool: |
2c334e87 WS |
514 | ret = match_int(&args[0], &intarg); |
515 | if (ret) { | |
516 | goto out; | |
517 | } else if (intarg > 0) { | |
4543df7e | 518 | info->thread_pool_size = intarg; |
2c334e87 WS |
519 | } else { |
520 | ret = -EINVAL; | |
521 | goto out; | |
522 | } | |
4543df7e | 523 | break; |
6f568d35 | 524 | case Opt_max_inline: |
edf24abe CH |
525 | num = match_strdup(&args[0]); |
526 | if (num) { | |
91748467 | 527 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
528 | kfree(num); |
529 | ||
15ada040 CM |
530 | if (info->max_inline) { |
531 | info->max_inline = max_t(u64, | |
532 | info->max_inline, | |
533 | root->sectorsize); | |
534 | } | |
efe120a0 | 535 | btrfs_info(root->fs_info, "max_inline at %llu", |
c1c9ff7c | 536 | info->max_inline); |
2c334e87 WS |
537 | } else { |
538 | ret = -ENOMEM; | |
539 | goto out; | |
6f568d35 CM |
540 | } |
541 | break; | |
8f662a76 | 542 | case Opt_alloc_start: |
edf24abe CH |
543 | num = match_strdup(&args[0]); |
544 | if (num) { | |
c018daec | 545 | mutex_lock(&info->chunk_mutex); |
91748467 | 546 | info->alloc_start = memparse(num, NULL); |
c018daec | 547 | mutex_unlock(&info->chunk_mutex); |
edf24abe | 548 | kfree(num); |
efe120a0 | 549 | btrfs_info(root->fs_info, "allocations start at %llu", |
c1c9ff7c | 550 | info->alloc_start); |
2c334e87 WS |
551 | } else { |
552 | ret = -ENOMEM; | |
553 | goto out; | |
8f662a76 CM |
554 | } |
555 | break; | |
bd0330ad QW |
556 | case Opt_acl: |
557 | root->fs_info->sb->s_flags |= MS_POSIXACL; | |
558 | break; | |
33268eaf JB |
559 | case Opt_noacl: |
560 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
561 | break; | |
3a5e1404 | 562 | case Opt_notreelog: |
efe120a0 | 563 | btrfs_info(root->fs_info, "disabling tree log"); |
3a5e1404 SW |
564 | btrfs_set_opt(info->mount_opt, NOTREELOG); |
565 | break; | |
dccae999 | 566 | case Opt_flushoncommit: |
efe120a0 | 567 | btrfs_info(root->fs_info, "turning on flush-on-commit"); |
dccae999 SW |
568 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); |
569 | break; | |
2c9ee856 QW |
570 | case Opt_noflushoncommit: |
571 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) | |
572 | btrfs_info(root->fs_info, "turning off flush-on-commit"); | |
573 | btrfs_clear_opt(info->mount_opt, FLUSHONCOMMIT); | |
574 | break; | |
97e728d4 | 575 | case Opt_ratio: |
2c334e87 WS |
576 | ret = match_int(&args[0], &intarg); |
577 | if (ret) { | |
578 | goto out; | |
579 | } else if (intarg >= 0) { | |
97e728d4 | 580 | info->metadata_ratio = intarg; |
efe120a0 | 581 | btrfs_info(root->fs_info, "metadata ratio %d", |
97e728d4 | 582 | info->metadata_ratio); |
2c334e87 WS |
583 | } else { |
584 | ret = -EINVAL; | |
585 | goto out; | |
97e728d4 JB |
586 | } |
587 | break; | |
e244a0ae CH |
588 | case Opt_discard: |
589 | btrfs_set_opt(info->mount_opt, DISCARD); | |
590 | break; | |
e07a2ade QW |
591 | case Opt_nodiscard: |
592 | btrfs_clear_opt(info->mount_opt, DISCARD); | |
593 | break; | |
0af3d00b | 594 | case Opt_space_cache: |
0af3d00b | 595 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
0de90876 | 596 | break; |
f420ee1e SB |
597 | case Opt_rescan_uuid_tree: |
598 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); | |
599 | break; | |
73bc1876 | 600 | case Opt_no_space_cache: |
efe120a0 | 601 | btrfs_info(root->fs_info, "disabling disk space caching"); |
73bc1876 JB |
602 | btrfs_clear_opt(info->mount_opt, SPACE_CACHE); |
603 | break; | |
4b9465cb | 604 | case Opt_inode_cache: |
efe120a0 | 605 | btrfs_info(root->fs_info, "enabling inode map caching"); |
4b9465cb CM |
606 | btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); |
607 | break; | |
88c2ba3b | 608 | case Opt_clear_cache: |
efe120a0 | 609 | btrfs_info(root->fs_info, "force clearing of disk cache"); |
88c2ba3b | 610 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); |
0af3d00b | 611 | break; |
4260f7c7 SW |
612 | case Opt_user_subvol_rm_allowed: |
613 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
614 | break; | |
91435650 CM |
615 | case Opt_enospc_debug: |
616 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
617 | break; | |
53036293 QW |
618 | case Opt_noenospc_debug: |
619 | btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); | |
620 | break; | |
4cb5300b | 621 | case Opt_defrag: |
efe120a0 | 622 | btrfs_info(root->fs_info, "enabling auto defrag"); |
4cb5300b CM |
623 | btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); |
624 | break; | |
fc0ca9af QW |
625 | case Opt_nodefrag: |
626 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
627 | btrfs_info(root->fs_info, "disabling auto defrag"); | |
628 | btrfs_clear_opt(info->mount_opt, AUTO_DEFRAG); | |
629 | break; | |
af31f5e5 | 630 | case Opt_recovery: |
efe120a0 | 631 | btrfs_info(root->fs_info, "enabling auto recovery"); |
af31f5e5 CM |
632 | btrfs_set_opt(info->mount_opt, RECOVERY); |
633 | break; | |
9555c6c1 ID |
634 | case Opt_skip_balance: |
635 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
636 | break; | |
21adbd5c SB |
637 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
638 | case Opt_check_integrity_including_extent_data: | |
efe120a0 FH |
639 | btrfs_info(root->fs_info, |
640 | "enabling check integrity including extent data"); | |
21adbd5c SB |
641 | btrfs_set_opt(info->mount_opt, |
642 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
643 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
644 | break; | |
645 | case Opt_check_integrity: | |
efe120a0 | 646 | btrfs_info(root->fs_info, "enabling check integrity"); |
21adbd5c SB |
647 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
648 | break; | |
649 | case Opt_check_integrity_print_mask: | |
2c334e87 WS |
650 | ret = match_int(&args[0], &intarg); |
651 | if (ret) { | |
652 | goto out; | |
653 | } else if (intarg >= 0) { | |
21adbd5c | 654 | info->check_integrity_print_mask = intarg; |
efe120a0 | 655 | btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", |
21adbd5c | 656 | info->check_integrity_print_mask); |
2c334e87 WS |
657 | } else { |
658 | ret = -EINVAL; | |
659 | goto out; | |
21adbd5c SB |
660 | } |
661 | break; | |
662 | #else | |
663 | case Opt_check_integrity_including_extent_data: | |
664 | case Opt_check_integrity: | |
665 | case Opt_check_integrity_print_mask: | |
efe120a0 FH |
666 | btrfs_err(root->fs_info, |
667 | "support for check_integrity* not compiled in!"); | |
21adbd5c SB |
668 | ret = -EINVAL; |
669 | goto out; | |
670 | #endif | |
8c342930 JM |
671 | case Opt_fatal_errors: |
672 | if (strcmp(args[0].from, "panic") == 0) | |
673 | btrfs_set_opt(info->mount_opt, | |
674 | PANIC_ON_FATAL_ERROR); | |
675 | else if (strcmp(args[0].from, "bug") == 0) | |
676 | btrfs_clear_opt(info->mount_opt, | |
677 | PANIC_ON_FATAL_ERROR); | |
678 | else { | |
679 | ret = -EINVAL; | |
680 | goto out; | |
681 | } | |
682 | break; | |
8b87dc17 DS |
683 | case Opt_commit_interval: |
684 | intarg = 0; | |
685 | ret = match_int(&args[0], &intarg); | |
686 | if (ret < 0) { | |
efe120a0 | 687 | btrfs_err(root->fs_info, "invalid commit interval"); |
8b87dc17 DS |
688 | ret = -EINVAL; |
689 | goto out; | |
690 | } | |
691 | if (intarg > 0) { | |
692 | if (intarg > 300) { | |
efe120a0 | 693 | btrfs_warn(root->fs_info, "excessive commit interval %d", |
8b87dc17 DS |
694 | intarg); |
695 | } | |
696 | info->commit_interval = intarg; | |
697 | } else { | |
efe120a0 | 698 | btrfs_info(root->fs_info, "using default commit interval %ds", |
8b87dc17 DS |
699 | BTRFS_DEFAULT_COMMIT_INTERVAL); |
700 | info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; | |
701 | } | |
702 | break; | |
a7a3f7ca | 703 | case Opt_err: |
efe120a0 | 704 | btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); |
a7a3f7ca SW |
705 | ret = -EINVAL; |
706 | goto out; | |
95e05289 | 707 | default: |
be20aa9d | 708 | break; |
95e05289 CM |
709 | } |
710 | } | |
a7a3f7ca | 711 | out: |
73bc1876 | 712 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
efe120a0 | 713 | btrfs_info(root->fs_info, "disk space caching is enabled"); |
da495ecc | 714 | kfree(orig); |
a7a3f7ca | 715 | return ret; |
edf24abe CH |
716 | } |
717 | ||
718 | /* | |
719 | * Parse mount options that are required early in the mount process. | |
720 | * | |
721 | * All other options will be parsed on much later in the mount process and | |
722 | * only when we need to allocate a new super block. | |
723 | */ | |
97288f2c | 724 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 725 | void *holder, char **subvol_name, u64 *subvol_objectid, |
5e2a4b25 | 726 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
727 | { |
728 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 729 | char *device_name, *opts, *orig, *p; |
1493381f | 730 | char *num = NULL; |
edf24abe CH |
731 | int error = 0; |
732 | ||
733 | if (!options) | |
830c4adb | 734 | return 0; |
edf24abe CH |
735 | |
736 | /* | |
737 | * strsep changes the string, duplicate it because parse_options | |
738 | * gets called twice | |
739 | */ | |
740 | opts = kstrdup(options, GFP_KERNEL); | |
741 | if (!opts) | |
742 | return -ENOMEM; | |
3f3d0bc0 | 743 | orig = opts; |
edf24abe CH |
744 | |
745 | while ((p = strsep(&opts, ",")) != NULL) { | |
746 | int token; | |
747 | if (!*p) | |
748 | continue; | |
749 | ||
750 | token = match_token(p, tokens, args); | |
751 | switch (token) { | |
752 | case Opt_subvol: | |
a90e8b6f | 753 | kfree(*subvol_name); |
edf24abe | 754 | *subvol_name = match_strdup(&args[0]); |
2c334e87 WS |
755 | if (!*subvol_name) { |
756 | error = -ENOMEM; | |
757 | goto out; | |
758 | } | |
edf24abe | 759 | break; |
73f73415 | 760 | case Opt_subvolid: |
1493381f WS |
761 | num = match_strdup(&args[0]); |
762 | if (num) { | |
763 | *subvol_objectid = memparse(num, NULL); | |
764 | kfree(num); | |
4849f01d | 765 | /* we want the original fs_tree */ |
1493381f | 766 | if (!*subvol_objectid) |
4849f01d JB |
767 | *subvol_objectid = |
768 | BTRFS_FS_TREE_OBJECTID; | |
2c334e87 WS |
769 | } else { |
770 | error = -EINVAL; | |
771 | goto out; | |
4849f01d | 772 | } |
73f73415 | 773 | break; |
e15d0542 | 774 | case Opt_subvolrootid: |
5e2a4b25 | 775 | printk(KERN_WARNING |
efe120a0 FH |
776 | "BTRFS: 'subvolrootid' mount option is deprecated and has " |
777 | "no effect\n"); | |
e15d0542 | 778 | break; |
43e570b0 | 779 | case Opt_device: |
83c8c9bd JL |
780 | device_name = match_strdup(&args[0]); |
781 | if (!device_name) { | |
782 | error = -ENOMEM; | |
783 | goto out; | |
784 | } | |
785 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 786 | flags, holder, fs_devices); |
83c8c9bd | 787 | kfree(device_name); |
43e570b0 | 788 | if (error) |
830c4adb | 789 | goto out; |
43e570b0 | 790 | break; |
edf24abe CH |
791 | default: |
792 | break; | |
793 | } | |
794 | } | |
795 | ||
830c4adb | 796 | out: |
3f3d0bc0 | 797 | kfree(orig); |
edf24abe | 798 | return error; |
95e05289 CM |
799 | } |
800 | ||
73f73415 JB |
801 | static struct dentry *get_default_root(struct super_block *sb, |
802 | u64 subvol_objectid) | |
803 | { | |
815745cf AV |
804 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
805 | struct btrfs_root *root = fs_info->tree_root; | |
73f73415 JB |
806 | struct btrfs_root *new_root; |
807 | struct btrfs_dir_item *di; | |
808 | struct btrfs_path *path; | |
809 | struct btrfs_key location; | |
810 | struct inode *inode; | |
73f73415 JB |
811 | u64 dir_id; |
812 | int new = 0; | |
813 | ||
814 | /* | |
815 | * We have a specific subvol we want to mount, just setup location and | |
816 | * go look up the root. | |
817 | */ | |
818 | if (subvol_objectid) { | |
819 | location.objectid = subvol_objectid; | |
820 | location.type = BTRFS_ROOT_ITEM_KEY; | |
821 | location.offset = (u64)-1; | |
822 | goto find_root; | |
823 | } | |
824 | ||
825 | path = btrfs_alloc_path(); | |
826 | if (!path) | |
827 | return ERR_PTR(-ENOMEM); | |
828 | path->leave_spinning = 1; | |
829 | ||
830 | /* | |
831 | * Find the "default" dir item which points to the root item that we | |
832 | * will mount by default if we haven't been given a specific subvolume | |
833 | * to mount. | |
834 | */ | |
815745cf | 835 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 836 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
837 | if (IS_ERR(di)) { |
838 | btrfs_free_path(path); | |
fb4f6f91 | 839 | return ERR_CAST(di); |
b0839166 | 840 | } |
73f73415 JB |
841 | if (!di) { |
842 | /* | |
843 | * Ok the default dir item isn't there. This is weird since | |
844 | * it's always been there, but don't freak out, just try and | |
845 | * mount to root most subvolume. | |
846 | */ | |
847 | btrfs_free_path(path); | |
848 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
815745cf | 849 | new_root = fs_info->fs_root; |
73f73415 JB |
850 | goto setup_root; |
851 | } | |
852 | ||
853 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
854 | btrfs_free_path(path); | |
855 | ||
856 | find_root: | |
815745cf | 857 | new_root = btrfs_read_fs_root_no_name(fs_info, &location); |
73f73415 | 858 | if (IS_ERR(new_root)) |
d0b678cb | 859 | return ERR_CAST(new_root); |
73f73415 | 860 | |
73f73415 JB |
861 | dir_id = btrfs_root_dirid(&new_root->root_item); |
862 | setup_root: | |
863 | location.objectid = dir_id; | |
864 | location.type = BTRFS_INODE_ITEM_KEY; | |
865 | location.offset = 0; | |
866 | ||
867 | inode = btrfs_iget(sb, &location, new_root, &new); | |
4cbd1149 DC |
868 | if (IS_ERR(inode)) |
869 | return ERR_CAST(inode); | |
73f73415 JB |
870 | |
871 | /* | |
872 | * If we're just mounting the root most subvol put the inode and return | |
873 | * a reference to the dentry. We will have already gotten a reference | |
874 | * to the inode in btrfs_fill_super so we're good to go. | |
875 | */ | |
876 | if (!new && sb->s_root->d_inode == inode) { | |
877 | iput(inode); | |
878 | return dget(sb->s_root); | |
879 | } | |
880 | ||
ba5b8958 | 881 | return d_obtain_alias(inode); |
73f73415 JB |
882 | } |
883 | ||
d397712b | 884 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 885 | struct btrfs_fs_devices *fs_devices, |
d397712b | 886 | void *data, int silent) |
75dfe396 | 887 | { |
d397712b | 888 | struct inode *inode; |
815745cf | 889 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 890 | struct btrfs_key key; |
39279cc3 | 891 | int err; |
a429e513 | 892 | |
39279cc3 CM |
893 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
894 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
895 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 896 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 897 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 898 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 899 | sb->s_time_gran = 1; |
0eda294d | 900 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 901 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 902 | #endif |
0c4d2d95 | 903 | sb->s_flags |= MS_I_VERSION; |
ad2b2c80 AV |
904 | err = open_ctree(sb, fs_devices, (char *)data); |
905 | if (err) { | |
efe120a0 | 906 | printk(KERN_ERR "BTRFS: open_ctree failed\n"); |
ad2b2c80 | 907 | return err; |
a429e513 CM |
908 | } |
909 | ||
5d4f98a2 YZ |
910 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
911 | key.type = BTRFS_INODE_ITEM_KEY; | |
912 | key.offset = 0; | |
98c7089c | 913 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
914 | if (IS_ERR(inode)) { |
915 | err = PTR_ERR(inode); | |
39279cc3 | 916 | goto fail_close; |
f254e52c | 917 | } |
f254e52c | 918 | |
48fde701 AV |
919 | sb->s_root = d_make_root(inode); |
920 | if (!sb->s_root) { | |
39279cc3 CM |
921 | err = -ENOMEM; |
922 | goto fail_close; | |
f254e52c | 923 | } |
58176a96 | 924 | |
6885f308 | 925 | save_mount_options(sb, data); |
90a887c9 | 926 | cleancache_init_fs(sb); |
59553edf | 927 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 928 | return 0; |
39279cc3 CM |
929 | |
930 | fail_close: | |
815745cf | 931 | close_ctree(fs_info->tree_root); |
39279cc3 | 932 | return err; |
2619ba1f CM |
933 | } |
934 | ||
6bf13c0c | 935 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
936 | { |
937 | struct btrfs_trans_handle *trans; | |
815745cf AV |
938 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
939 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 940 | |
1abe9b8a | 941 | trace_btrfs_sync_fs(wait); |
942 | ||
39279cc3 | 943 | if (!wait) { |
815745cf | 944 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
945 | return 0; |
946 | } | |
771ed689 | 947 | |
b0244199 | 948 | btrfs_wait_ordered_roots(fs_info, -1); |
771ed689 | 949 | |
d4edf39b | 950 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 951 | if (IS_ERR(trans)) { |
354aa0fb MX |
952 | /* no transaction, don't bother */ |
953 | if (PTR_ERR(trans) == -ENOENT) | |
60376ce4 | 954 | return 0; |
98d5dc13 | 955 | return PTR_ERR(trans); |
60376ce4 | 956 | } |
bd7de2c9 | 957 | return btrfs_commit_transaction(trans, root); |
2c90e5d6 CM |
958 | } |
959 | ||
34c80b1d | 960 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 961 | { |
815745cf AV |
962 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
963 | struct btrfs_root *root = info->tree_root; | |
200da64e | 964 | char *compress_type; |
a9572a15 EP |
965 | |
966 | if (btrfs_test_opt(root, DEGRADED)) | |
967 | seq_puts(seq, ",degraded"); | |
968 | if (btrfs_test_opt(root, NODATASUM)) | |
969 | seq_puts(seq, ",nodatasum"); | |
970 | if (btrfs_test_opt(root, NODATACOW)) | |
971 | seq_puts(seq, ",nodatacow"); | |
972 | if (btrfs_test_opt(root, NOBARRIER)) | |
973 | seq_puts(seq, ",nobarrier"); | |
a9572a15 | 974 | if (info->max_inline != 8192 * 1024) |
c1c9ff7c | 975 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
a9572a15 | 976 | if (info->alloc_start != 0) |
c1c9ff7c | 977 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); |
a9572a15 EP |
978 | if (info->thread_pool_size != min_t(unsigned long, |
979 | num_online_cpus() + 2, 8)) | |
980 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
200da64e TI |
981 | if (btrfs_test_opt(root, COMPRESS)) { |
982 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) | |
983 | compress_type = "zlib"; | |
984 | else | |
985 | compress_type = "lzo"; | |
986 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
987 | seq_printf(seq, ",compress-force=%s", compress_type); | |
988 | else | |
989 | seq_printf(seq, ",compress=%s", compress_type); | |
990 | } | |
c289811c CM |
991 | if (btrfs_test_opt(root, NOSSD)) |
992 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
993 | if (btrfs_test_opt(root, SSD_SPREAD)) |
994 | seq_puts(seq, ",ssd_spread"); | |
995 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 996 | seq_puts(seq, ",ssd"); |
3a5e1404 | 997 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 998 | seq_puts(seq, ",notreelog"); |
dccae999 | 999 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 1000 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
1001 | if (btrfs_test_opt(root, DISCARD)) |
1002 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
1003 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
1004 | seq_puts(seq, ",noacl"); | |
200da64e TI |
1005 | if (btrfs_test_opt(root, SPACE_CACHE)) |
1006 | seq_puts(seq, ",space_cache"); | |
73bc1876 | 1007 | else |
8965593e | 1008 | seq_puts(seq, ",nospace_cache"); |
f420ee1e SB |
1009 | if (btrfs_test_opt(root, RESCAN_UUID_TREE)) |
1010 | seq_puts(seq, ",rescan_uuid_tree"); | |
200da64e TI |
1011 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
1012 | seq_puts(seq, ",clear_cache"); | |
1013 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
1014 | seq_puts(seq, ",user_subvol_rm_allowed"); | |
0942caa3 DS |
1015 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
1016 | seq_puts(seq, ",enospc_debug"); | |
1017 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
1018 | seq_puts(seq, ",autodefrag"); | |
1019 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) | |
1020 | seq_puts(seq, ",inode_cache"); | |
9555c6c1 ID |
1021 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
1022 | seq_puts(seq, ",skip_balance"); | |
8507d216 WS |
1023 | if (btrfs_test_opt(root, RECOVERY)) |
1024 | seq_puts(seq, ",recovery"); | |
1025 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
1026 | if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) | |
1027 | seq_puts(seq, ",check_int_data"); | |
1028 | else if (btrfs_test_opt(root, CHECK_INTEGRITY)) | |
1029 | seq_puts(seq, ",check_int"); | |
1030 | if (info->check_integrity_print_mask) | |
1031 | seq_printf(seq, ",check_int_print_mask=%d", | |
1032 | info->check_integrity_print_mask); | |
1033 | #endif | |
1034 | if (info->metadata_ratio) | |
1035 | seq_printf(seq, ",metadata_ratio=%d", | |
1036 | info->metadata_ratio); | |
8c342930 JM |
1037 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
1038 | seq_puts(seq, ",fatal_errors=panic"); | |
8b87dc17 DS |
1039 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
1040 | seq_printf(seq, ",commit=%d", info->commit_interval); | |
a9572a15 EP |
1041 | return 0; |
1042 | } | |
1043 | ||
a061fc8d | 1044 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 1045 | { |
815745cf AV |
1046 | struct btrfs_fs_info *p = data; |
1047 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 1048 | |
815745cf | 1049 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
1050 | } |
1051 | ||
450ba0ea JB |
1052 | static int btrfs_set_super(struct super_block *s, void *data) |
1053 | { | |
6de1d09d AV |
1054 | int err = set_anon_super(s, data); |
1055 | if (!err) | |
1056 | s->s_fs_info = data; | |
1057 | return err; | |
4b82d6e4 Y |
1058 | } |
1059 | ||
f9d9ef62 DS |
1060 | /* |
1061 | * subvolumes are identified by ino 256 | |
1062 | */ | |
1063 | static inline int is_subvolume_inode(struct inode *inode) | |
1064 | { | |
1065 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1066 | return 1; | |
1067 | return 0; | |
1068 | } | |
1069 | ||
830c4adb JB |
1070 | /* |
1071 | * This will strip out the subvol=%s argument for an argument string and add | |
1072 | * subvolid=0 to make sure we get the actual tree root for path walking to the | |
1073 | * subvol we want. | |
1074 | */ | |
1075 | static char *setup_root_args(char *args) | |
1076 | { | |
f60d16a8 JM |
1077 | unsigned len = strlen(args) + 2 + 1; |
1078 | char *src, *dst, *buf; | |
830c4adb JB |
1079 | |
1080 | /* | |
f60d16a8 JM |
1081 | * We need the same args as before, but with this substitution: |
1082 | * s!subvol=[^,]+!subvolid=0! | |
830c4adb | 1083 | * |
f60d16a8 JM |
1084 | * Since the replacement string is up to 2 bytes longer than the |
1085 | * original, allocate strlen(args) + 2 + 1 bytes. | |
830c4adb | 1086 | */ |
830c4adb | 1087 | |
f60d16a8 | 1088 | src = strstr(args, "subvol="); |
830c4adb | 1089 | /* This shouldn't happen, but just in case.. */ |
f60d16a8 JM |
1090 | if (!src) |
1091 | return NULL; | |
1092 | ||
1093 | buf = dst = kmalloc(len, GFP_NOFS); | |
1094 | if (!buf) | |
830c4adb | 1095 | return NULL; |
830c4adb JB |
1096 | |
1097 | /* | |
f60d16a8 JM |
1098 | * If the subvol= arg is not at the start of the string, |
1099 | * copy whatever precedes it into buf. | |
830c4adb | 1100 | */ |
f60d16a8 JM |
1101 | if (src != args) { |
1102 | *src++ = '\0'; | |
1103 | strcpy(buf, args); | |
1104 | dst += strlen(args); | |
830c4adb JB |
1105 | } |
1106 | ||
f60d16a8 JM |
1107 | strcpy(dst, "subvolid=0"); |
1108 | dst += strlen("subvolid=0"); | |
830c4adb JB |
1109 | |
1110 | /* | |
f60d16a8 JM |
1111 | * If there is a "," after the original subvol=... string, |
1112 | * copy that suffix into our buffer. Otherwise, we're done. | |
830c4adb | 1113 | */ |
f60d16a8 JM |
1114 | src = strchr(src, ','); |
1115 | if (src) | |
1116 | strcpy(dst, src); | |
830c4adb | 1117 | |
f60d16a8 | 1118 | return buf; |
830c4adb JB |
1119 | } |
1120 | ||
1121 | static struct dentry *mount_subvol(const char *subvol_name, int flags, | |
1122 | const char *device_name, char *data) | |
1123 | { | |
830c4adb JB |
1124 | struct dentry *root; |
1125 | struct vfsmount *mnt; | |
830c4adb | 1126 | char *newargs; |
830c4adb JB |
1127 | |
1128 | newargs = setup_root_args(data); | |
1129 | if (!newargs) | |
1130 | return ERR_PTR(-ENOMEM); | |
1131 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, | |
1132 | newargs); | |
1133 | kfree(newargs); | |
1134 | if (IS_ERR(mnt)) | |
1135 | return ERR_CAST(mnt); | |
1136 | ||
ea441d11 | 1137 | root = mount_subtree(mnt, subvol_name); |
830c4adb | 1138 | |
ea441d11 AV |
1139 | if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { |
1140 | struct super_block *s = root->d_sb; | |
1141 | dput(root); | |
1142 | root = ERR_PTR(-EINVAL); | |
1143 | deactivate_locked_super(s); | |
efe120a0 | 1144 | printk(KERN_ERR "BTRFS: '%s' is not a valid subvolume\n", |
f9d9ef62 | 1145 | subvol_name); |
f9d9ef62 DS |
1146 | } |
1147 | ||
830c4adb JB |
1148 | return root; |
1149 | } | |
450ba0ea | 1150 | |
edf24abe CH |
1151 | /* |
1152 | * Find a superblock for the given device / mount point. | |
1153 | * | |
1154 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1155 | * for multiple device setup. Make sure to keep it in sync. | |
1156 | */ | |
061dbc6b | 1157 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1158 | const char *device_name, void *data) |
4b82d6e4 Y |
1159 | { |
1160 | struct block_device *bdev = NULL; | |
1161 | struct super_block *s; | |
1162 | struct dentry *root; | |
8a4b83cc | 1163 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 1164 | struct btrfs_fs_info *fs_info = NULL; |
97288f2c | 1165 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1166 | char *subvol_name = NULL; |
1167 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
1168 | int error = 0; |
1169 | ||
97288f2c CH |
1170 | if (!(flags & MS_RDONLY)) |
1171 | mode |= FMODE_WRITE; | |
1172 | ||
1173 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 1174 | &subvol_name, &subvol_objectid, |
5e2a4b25 | 1175 | &fs_devices); |
f23c8af8 ID |
1176 | if (error) { |
1177 | kfree(subvol_name); | |
061dbc6b | 1178 | return ERR_PTR(error); |
f23c8af8 | 1179 | } |
edf24abe | 1180 | |
830c4adb JB |
1181 | if (subvol_name) { |
1182 | root = mount_subvol(subvol_name, flags, device_name, data); | |
1183 | kfree(subvol_name); | |
1184 | return root; | |
1185 | } | |
1186 | ||
306e16ce | 1187 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 1188 | if (error) |
830c4adb | 1189 | return ERR_PTR(error); |
4b82d6e4 | 1190 | |
450ba0ea JB |
1191 | /* |
1192 | * Setup a dummy root and fs_info for test/set super. This is because | |
1193 | * we don't actually fill this stuff out until open_ctree, but we need | |
1194 | * it for searching for existing supers, so this lets us do that and | |
1195 | * then open_ctree will properly initialize everything later. | |
1196 | */ | |
1197 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
04d21a24 ID |
1198 | if (!fs_info) |
1199 | return ERR_PTR(-ENOMEM); | |
1200 | ||
450ba0ea | 1201 | fs_info->fs_devices = fs_devices; |
450ba0ea | 1202 | |
6c41761f DS |
1203 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
1204 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
1205 | if (!fs_info->super_copy || !fs_info->super_for_commit) { | |
1206 | error = -ENOMEM; | |
04d21a24 ID |
1207 | goto error_fs_info; |
1208 | } | |
1209 | ||
1210 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1211 | if (error) | |
1212 | goto error_fs_info; | |
1213 | ||
1214 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1215 | error = -EACCES; | |
6c41761f DS |
1216 | goto error_close_devices; |
1217 | } | |
1218 | ||
dfe25020 | 1219 | bdev = fs_devices->latest_bdev; |
9249e17f DH |
1220 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
1221 | fs_info); | |
830c4adb JB |
1222 | if (IS_ERR(s)) { |
1223 | error = PTR_ERR(s); | |
1224 | goto error_close_devices; | |
1225 | } | |
4b82d6e4 Y |
1226 | |
1227 | if (s->s_root) { | |
2b82032c | 1228 | btrfs_close_devices(fs_devices); |
6c41761f | 1229 | free_fs_info(fs_info); |
59553edf AV |
1230 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1231 | error = -EBUSY; | |
4b82d6e4 Y |
1232 | } else { |
1233 | char b[BDEVNAME_SIZE]; | |
1234 | ||
4b82d6e4 | 1235 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
815745cf | 1236 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1237 | error = btrfs_fill_super(s, fs_devices, data, |
1238 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 Y |
1239 | } |
1240 | ||
59553edf AV |
1241 | root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); |
1242 | if (IS_ERR(root)) | |
830c4adb | 1243 | deactivate_locked_super(s); |
4b82d6e4 | 1244 | |
061dbc6b | 1245 | return root; |
4b82d6e4 | 1246 | |
c146afad | 1247 | error_close_devices: |
8a4b83cc | 1248 | btrfs_close_devices(fs_devices); |
04d21a24 | 1249 | error_fs_info: |
6c41761f | 1250 | free_fs_info(fs_info); |
061dbc6b | 1251 | return ERR_PTR(error); |
4b82d6e4 | 1252 | } |
2e635a27 | 1253 | |
0d2450ab ST |
1254 | static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit) |
1255 | { | |
1256 | spin_lock_irq(&workers->lock); | |
1257 | workers->max_workers = new_limit; | |
1258 | spin_unlock_irq(&workers->lock); | |
1259 | } | |
1260 | ||
1261 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, | |
1262 | int new_pool_size, int old_pool_size) | |
1263 | { | |
1264 | if (new_pool_size == old_pool_size) | |
1265 | return; | |
1266 | ||
1267 | fs_info->thread_pool_size = new_pool_size; | |
1268 | ||
efe120a0 | 1269 | btrfs_info(fs_info, "resize thread pool %d -> %d", |
0d2450ab ST |
1270 | old_pool_size, new_pool_size); |
1271 | ||
1272 | btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size); | |
1273 | btrfs_set_max_workers(&fs_info->workers, new_pool_size); | |
1274 | btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size); | |
1275 | btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size); | |
1276 | btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size); | |
1277 | btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size); | |
1278 | btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size); | |
1279 | btrfs_set_max_workers(&fs_info->endio_meta_workers, new_pool_size); | |
1280 | btrfs_set_max_workers(&fs_info->endio_meta_write_workers, new_pool_size); | |
1281 | btrfs_set_max_workers(&fs_info->endio_write_workers, new_pool_size); | |
1282 | btrfs_set_max_workers(&fs_info->endio_freespace_worker, new_pool_size); | |
1283 | btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size); | |
1284 | btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size); | |
ff023aac SB |
1285 | btrfs_set_max_workers(&fs_info->scrub_wr_completion_workers, |
1286 | new_pool_size); | |
0d2450ab ST |
1287 | } |
1288 | ||
f42a34b2 | 1289 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
dc81cdc5 MX |
1290 | { |
1291 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
f42a34b2 | 1292 | } |
dc81cdc5 | 1293 | |
f42a34b2 MX |
1294 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
1295 | unsigned long old_opts, int flags) | |
1296 | { | |
dc81cdc5 MX |
1297 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1298 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1299 | (flags & MS_RDONLY))) { | |
1300 | /* wait for any defraggers to finish */ | |
1301 | wait_event(fs_info->transaction_wait, | |
1302 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1303 | if (flags & MS_RDONLY) | |
1304 | sync_filesystem(fs_info->sb); | |
1305 | } | |
1306 | } | |
1307 | ||
1308 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1309 | unsigned long old_opts) | |
1310 | { | |
1311 | /* | |
1312 | * We need cleanup all defragable inodes if the autodefragment is | |
1313 | * close or the fs is R/O. | |
1314 | */ | |
1315 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1316 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1317 | (fs_info->sb->s_flags & MS_RDONLY))) { | |
1318 | btrfs_cleanup_defrag_inodes(fs_info); | |
1319 | } | |
1320 | ||
1321 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1322 | } | |
1323 | ||
c146afad YZ |
1324 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1325 | { | |
815745cf AV |
1326 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1327 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1328 | unsigned old_flags = sb->s_flags; |
1329 | unsigned long old_opts = fs_info->mount_opt; | |
1330 | unsigned long old_compress_type = fs_info->compress_type; | |
1331 | u64 old_max_inline = fs_info->max_inline; | |
1332 | u64 old_alloc_start = fs_info->alloc_start; | |
1333 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1334 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
c146afad YZ |
1335 | int ret; |
1336 | ||
f42a34b2 | 1337 | btrfs_remount_prepare(fs_info); |
dc81cdc5 | 1338 | |
b288052e | 1339 | ret = btrfs_parse_options(root, data); |
49b25e05 JM |
1340 | if (ret) { |
1341 | ret = -EINVAL; | |
1342 | goto restore; | |
1343 | } | |
b288052e | 1344 | |
f42a34b2 | 1345 | btrfs_remount_begin(fs_info, old_opts, *flags); |
0d2450ab ST |
1346 | btrfs_resize_thread_pool(fs_info, |
1347 | fs_info->thread_pool_size, old_thread_pool_size); | |
1348 | ||
c146afad | 1349 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
dc81cdc5 | 1350 | goto out; |
c146afad YZ |
1351 | |
1352 | if (*flags & MS_RDONLY) { | |
8dabb742 SB |
1353 | /* |
1354 | * this also happens on 'umount -rf' or on shutdown, when | |
1355 | * the filesystem is busy. | |
1356 | */ | |
361c093d SB |
1357 | |
1358 | /* wait for the uuid_scan task to finish */ | |
1359 | down(&fs_info->uuid_tree_rescan_sem); | |
1360 | /* avoid complains from lockdep et al. */ | |
1361 | up(&fs_info->uuid_tree_rescan_sem); | |
1362 | ||
c146afad YZ |
1363 | sb->s_flags |= MS_RDONLY; |
1364 | ||
8dabb742 SB |
1365 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1366 | btrfs_scrub_cancel(fs_info); | |
061594ef | 1367 | btrfs_pause_balance(fs_info); |
8dabb742 | 1368 | |
49b25e05 JM |
1369 | ret = btrfs_commit_super(root); |
1370 | if (ret) | |
1371 | goto restore; | |
c146afad | 1372 | } else { |
6ef3de9c DS |
1373 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
1374 | btrfs_err(fs_info, | |
efe120a0 | 1375 | "Remounting read-write after error is not allowed"); |
6ef3de9c DS |
1376 | ret = -EINVAL; |
1377 | goto restore; | |
1378 | } | |
8a3db184 | 1379 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1380 | ret = -EACCES; |
1381 | goto restore; | |
8a3db184 | 1382 | } |
2b82032c | 1383 | |
292fd7fc SB |
1384 | if (fs_info->fs_devices->missing_devices > |
1385 | fs_info->num_tolerated_disk_barrier_failures && | |
1386 | !(*flags & MS_RDONLY)) { | |
efe120a0 FH |
1387 | btrfs_warn(fs_info, |
1388 | "too many missing devices, writeable remount is not allowed"); | |
292fd7fc SB |
1389 | ret = -EACCES; |
1390 | goto restore; | |
1391 | } | |
1392 | ||
8a3db184 | 1393 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1394 | ret = -EINVAL; |
1395 | goto restore; | |
8a3db184 | 1396 | } |
c146afad | 1397 | |
815745cf | 1398 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1399 | if (ret) |
1400 | goto restore; | |
c146afad | 1401 | |
d68fc57b YZ |
1402 | /* recover relocation */ |
1403 | ret = btrfs_recover_relocation(root); | |
49b25e05 JM |
1404 | if (ret) |
1405 | goto restore; | |
c146afad | 1406 | |
2b6ba629 ID |
1407 | ret = btrfs_resume_balance_async(fs_info); |
1408 | if (ret) | |
1409 | goto restore; | |
1410 | ||
8dabb742 SB |
1411 | ret = btrfs_resume_dev_replace_async(fs_info); |
1412 | if (ret) { | |
efe120a0 | 1413 | btrfs_warn(fs_info, "failed to resume dev_replace"); |
8dabb742 SB |
1414 | goto restore; |
1415 | } | |
94aebfb2 JB |
1416 | |
1417 | if (!fs_info->uuid_root) { | |
efe120a0 | 1418 | btrfs_info(fs_info, "creating UUID tree"); |
94aebfb2 JB |
1419 | ret = btrfs_create_uuid_tree(fs_info); |
1420 | if (ret) { | |
efe120a0 | 1421 | btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); |
94aebfb2 JB |
1422 | goto restore; |
1423 | } | |
1424 | } | |
c146afad YZ |
1425 | sb->s_flags &= ~MS_RDONLY; |
1426 | } | |
dc81cdc5 MX |
1427 | out: |
1428 | btrfs_remount_cleanup(fs_info, old_opts); | |
c146afad | 1429 | return 0; |
49b25e05 JM |
1430 | |
1431 | restore: | |
1432 | /* We've hit an error - don't reset MS_RDONLY */ | |
1433 | if (sb->s_flags & MS_RDONLY) | |
1434 | old_flags |= MS_RDONLY; | |
1435 | sb->s_flags = old_flags; | |
1436 | fs_info->mount_opt = old_opts; | |
1437 | fs_info->compress_type = old_compress_type; | |
1438 | fs_info->max_inline = old_max_inline; | |
c018daec | 1439 | mutex_lock(&fs_info->chunk_mutex); |
49b25e05 | 1440 | fs_info->alloc_start = old_alloc_start; |
c018daec | 1441 | mutex_unlock(&fs_info->chunk_mutex); |
0d2450ab ST |
1442 | btrfs_resize_thread_pool(fs_info, |
1443 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 | 1444 | fs_info->metadata_ratio = old_metadata_ratio; |
dc81cdc5 | 1445 | btrfs_remount_cleanup(fs_info, old_opts); |
49b25e05 | 1446 | return ret; |
c146afad YZ |
1447 | } |
1448 | ||
bcd53741 AJ |
1449 | /* Used to sort the devices by max_avail(descending sort) */ |
1450 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1451 | const void *dev_info2) | |
1452 | { | |
1453 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1454 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1455 | return -1; | |
1456 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1457 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1458 | return 1; | |
1459 | else | |
1460 | return 0; | |
1461 | } | |
1462 | ||
1463 | /* | |
1464 | * sort the devices by max_avail, in which max free extent size of each device | |
1465 | * is stored.(Descending Sort) | |
1466 | */ | |
1467 | static inline void btrfs_descending_sort_devices( | |
1468 | struct btrfs_device_info *devices, | |
1469 | size_t nr_devices) | |
1470 | { | |
1471 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1472 | btrfs_cmp_device_free_bytes, NULL); | |
1473 | } | |
1474 | ||
6d07bcec MX |
1475 | /* |
1476 | * The helper to calc the free space on the devices that can be used to store | |
1477 | * file data. | |
1478 | */ | |
1479 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1480 | { | |
1481 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1482 | struct btrfs_device_info *devices_info; | |
1483 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1484 | struct btrfs_device *device; | |
1485 | u64 skip_space; | |
1486 | u64 type; | |
1487 | u64 avail_space; | |
1488 | u64 used_space; | |
1489 | u64 min_stripe_size; | |
39fb26c3 | 1490 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1491 | int i = 0, nr_devices; |
1492 | int ret; | |
1493 | ||
b772a86e | 1494 | nr_devices = fs_info->fs_devices->open_devices; |
6d07bcec MX |
1495 | BUG_ON(!nr_devices); |
1496 | ||
d9b0d9ba | 1497 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
6d07bcec MX |
1498 | GFP_NOFS); |
1499 | if (!devices_info) | |
1500 | return -ENOMEM; | |
1501 | ||
1502 | /* calc min stripe number for data space alloction */ | |
1503 | type = btrfs_get_alloc_profile(root, 1); | |
39fb26c3 | 1504 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1505 | min_stripes = 2; |
39fb26c3 MX |
1506 | num_stripes = nr_devices; |
1507 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1508 | min_stripes = 2; |
39fb26c3 MX |
1509 | num_stripes = 2; |
1510 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1511 | min_stripes = 4; |
39fb26c3 MX |
1512 | num_stripes = 4; |
1513 | } | |
6d07bcec MX |
1514 | |
1515 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1516 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1517 | else | |
1518 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1519 | ||
b772a86e | 1520 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
63a212ab SB |
1521 | if (!device->in_fs_metadata || !device->bdev || |
1522 | device->is_tgtdev_for_dev_replace) | |
6d07bcec MX |
1523 | continue; |
1524 | ||
1525 | avail_space = device->total_bytes - device->bytes_used; | |
1526 | ||
1527 | /* align with stripe_len */ | |
1528 | do_div(avail_space, BTRFS_STRIPE_LEN); | |
1529 | avail_space *= BTRFS_STRIPE_LEN; | |
1530 | ||
1531 | /* | |
1532 | * In order to avoid overwritting the superblock on the drive, | |
1533 | * btrfs starts at an offset of at least 1MB when doing chunk | |
1534 | * allocation. | |
1535 | */ | |
1536 | skip_space = 1024 * 1024; | |
1537 | ||
1538 | /* user can set the offset in fs_info->alloc_start. */ | |
1539 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1540 | device->total_bytes) | |
1541 | skip_space = max(fs_info->alloc_start, skip_space); | |
1542 | ||
1543 | /* | |
1544 | * btrfs can not use the free space in [0, skip_space - 1], | |
1545 | * we must subtract it from the total. In order to implement | |
1546 | * it, we account the used space in this range first. | |
1547 | */ | |
1548 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, | |
1549 | &used_space); | |
1550 | if (ret) { | |
1551 | kfree(devices_info); | |
1552 | return ret; | |
1553 | } | |
1554 | ||
1555 | /* calc the free space in [0, skip_space - 1] */ | |
1556 | skip_space -= used_space; | |
1557 | ||
1558 | /* | |
1559 | * we can use the free space in [0, skip_space - 1], subtract | |
1560 | * it from the total. | |
1561 | */ | |
1562 | if (avail_space && avail_space >= skip_space) | |
1563 | avail_space -= skip_space; | |
1564 | else | |
1565 | avail_space = 0; | |
1566 | ||
1567 | if (avail_space < min_stripe_size) | |
1568 | continue; | |
1569 | ||
1570 | devices_info[i].dev = device; | |
1571 | devices_info[i].max_avail = avail_space; | |
1572 | ||
1573 | i++; | |
1574 | } | |
1575 | ||
1576 | nr_devices = i; | |
1577 | ||
1578 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1579 | ||
1580 | i = nr_devices - 1; | |
1581 | avail_space = 0; | |
1582 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
1583 | if (num_stripes > nr_devices) |
1584 | num_stripes = nr_devices; | |
1585 | ||
6d07bcec MX |
1586 | if (devices_info[i].max_avail >= min_stripe_size) { |
1587 | int j; | |
1588 | u64 alloc_size; | |
1589 | ||
39fb26c3 | 1590 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 1591 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 1592 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
1593 | devices_info[j].max_avail -= alloc_size; |
1594 | } | |
1595 | i--; | |
1596 | nr_devices--; | |
1597 | } | |
1598 | ||
1599 | kfree(devices_info); | |
1600 | *free_bytes = avail_space; | |
1601 | return 0; | |
1602 | } | |
1603 | ||
8fd17795 CM |
1604 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1605 | { | |
815745cf AV |
1606 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
1607 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
1608 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
1609 | struct btrfs_space_info *found; |
1610 | u64 total_used = 0; | |
6d07bcec | 1611 | u64 total_free_data = 0; |
db94535d | 1612 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 1613 | __be32 *fsid = (__be32 *)fs_info->fsid; |
6d07bcec | 1614 | int ret; |
8fd17795 | 1615 | |
6d07bcec | 1616 | /* holding chunk_muext to avoid allocating new chunks */ |
815745cf | 1617 | mutex_lock(&fs_info->chunk_mutex); |
bd4d1088 | 1618 | rcu_read_lock(); |
89a55897 | 1619 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec MX |
1620 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
1621 | total_free_data += found->disk_total - found->disk_used; | |
1622 | total_free_data -= | |
1623 | btrfs_account_ro_block_groups_free_space(found); | |
1624 | } | |
1625 | ||
b742bb82 | 1626 | total_used += found->disk_used; |
89a55897 | 1627 | } |
bd4d1088 JB |
1628 | rcu_read_unlock(); |
1629 | ||
8fd17795 | 1630 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 1631 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 | 1632 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
8fd17795 CM |
1633 | buf->f_bsize = dentry->d_sb->s_blocksize; |
1634 | buf->f_type = BTRFS_SUPER_MAGIC; | |
6d07bcec | 1635 | buf->f_bavail = total_free_data; |
815745cf | 1636 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
6d07bcec | 1637 | if (ret) { |
815745cf | 1638 | mutex_unlock(&fs_info->chunk_mutex); |
6d07bcec MX |
1639 | return ret; |
1640 | } | |
1641 | buf->f_bavail += total_free_data; | |
1642 | buf->f_bavail = buf->f_bavail >> bits; | |
815745cf | 1643 | mutex_unlock(&fs_info->chunk_mutex); |
d397712b | 1644 | |
9d03632e | 1645 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 1646 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
1647 | on a big-endian or little-endian host */ |
1648 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
1649 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
1650 | /* Mask in the root object ID too, to disambiguate subvols */ |
1651 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
1652 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
1653 | ||
8fd17795 CM |
1654 | return 0; |
1655 | } | |
b5133862 | 1656 | |
aea52e19 AV |
1657 | static void btrfs_kill_super(struct super_block *sb) |
1658 | { | |
815745cf | 1659 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 1660 | kill_anon_super(sb); |
d22ca7de | 1661 | free_fs_info(fs_info); |
aea52e19 AV |
1662 | } |
1663 | ||
2e635a27 CM |
1664 | static struct file_system_type btrfs_fs_type = { |
1665 | .owner = THIS_MODULE, | |
1666 | .name = "btrfs", | |
061dbc6b | 1667 | .mount = btrfs_mount, |
aea52e19 | 1668 | .kill_sb = btrfs_kill_super, |
2e635a27 CM |
1669 | .fs_flags = FS_REQUIRES_DEV, |
1670 | }; | |
7f78e035 | 1671 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 1672 | |
d352ac68 CM |
1673 | /* |
1674 | * used by btrfsctl to scan devices when no FS is mounted | |
1675 | */ | |
8a4b83cc CM |
1676 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
1677 | unsigned long arg) | |
1678 | { | |
1679 | struct btrfs_ioctl_vol_args *vol; | |
1680 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 1681 | int ret = -ENOTTY; |
8a4b83cc | 1682 | |
e441d54d CM |
1683 | if (!capable(CAP_SYS_ADMIN)) |
1684 | return -EPERM; | |
1685 | ||
dae7b665 LZ |
1686 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
1687 | if (IS_ERR(vol)) | |
1688 | return PTR_ERR(vol); | |
c071fcfd | 1689 | |
8a4b83cc CM |
1690 | switch (cmd) { |
1691 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 1692 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
1693 | &btrfs_fs_type, &fs_devices); |
1694 | break; | |
02db0844 JB |
1695 | case BTRFS_IOC_DEVICES_READY: |
1696 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
1697 | &btrfs_fs_type, &fs_devices); | |
1698 | if (ret) | |
1699 | break; | |
1700 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
1701 | break; | |
8a4b83cc | 1702 | } |
dae7b665 | 1703 | |
8a4b83cc | 1704 | kfree(vol); |
f819d837 | 1705 | return ret; |
8a4b83cc CM |
1706 | } |
1707 | ||
0176260f | 1708 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 1709 | { |
354aa0fb MX |
1710 | struct btrfs_trans_handle *trans; |
1711 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
1712 | ||
d4edf39b | 1713 | trans = btrfs_attach_transaction_barrier(root); |
354aa0fb MX |
1714 | if (IS_ERR(trans)) { |
1715 | /* no transaction, don't bother */ | |
1716 | if (PTR_ERR(trans) == -ENOENT) | |
1717 | return 0; | |
1718 | return PTR_ERR(trans); | |
1719 | } | |
1720 | return btrfs_commit_transaction(trans, root); | |
ed0dab6b Y |
1721 | } |
1722 | ||
0176260f | 1723 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b | 1724 | { |
0176260f | 1725 | return 0; |
ed0dab6b | 1726 | } |
2e635a27 | 1727 | |
9c5085c1 JB |
1728 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
1729 | { | |
1730 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
1731 | struct btrfs_fs_devices *cur_devices; | |
1732 | struct btrfs_device *dev, *first_dev = NULL; | |
1733 | struct list_head *head; | |
1734 | struct rcu_string *name; | |
1735 | ||
1736 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
1737 | cur_devices = fs_info->fs_devices; | |
1738 | while (cur_devices) { | |
1739 | head = &cur_devices->devices; | |
1740 | list_for_each_entry(dev, head, dev_list) { | |
aa9ddcd4 JB |
1741 | if (dev->missing) |
1742 | continue; | |
9c5085c1 JB |
1743 | if (!first_dev || dev->devid < first_dev->devid) |
1744 | first_dev = dev; | |
1745 | } | |
1746 | cur_devices = cur_devices->seed; | |
1747 | } | |
1748 | ||
1749 | if (first_dev) { | |
1750 | rcu_read_lock(); | |
1751 | name = rcu_dereference(first_dev->name); | |
1752 | seq_escape(m, name->str, " \t\n\\"); | |
1753 | rcu_read_unlock(); | |
1754 | } else { | |
1755 | WARN_ON(1); | |
1756 | } | |
1757 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
1758 | return 0; | |
1759 | } | |
1760 | ||
b87221de | 1761 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 1762 | .drop_inode = btrfs_drop_inode, |
bd555975 | 1763 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 1764 | .put_super = btrfs_put_super, |
d5719762 | 1765 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 1766 | .show_options = btrfs_show_options, |
9c5085c1 | 1767 | .show_devname = btrfs_show_devname, |
4730a4bc | 1768 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
1769 | .alloc_inode = btrfs_alloc_inode, |
1770 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 1771 | .statfs = btrfs_statfs, |
c146afad | 1772 | .remount_fs = btrfs_remount, |
0176260f LT |
1773 | .freeze_fs = btrfs_freeze, |
1774 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 1775 | }; |
a9218f6b CM |
1776 | |
1777 | static const struct file_operations btrfs_ctl_fops = { | |
1778 | .unlocked_ioctl = btrfs_control_ioctl, | |
1779 | .compat_ioctl = btrfs_control_ioctl, | |
1780 | .owner = THIS_MODULE, | |
6038f373 | 1781 | .llseek = noop_llseek, |
a9218f6b CM |
1782 | }; |
1783 | ||
1784 | static struct miscdevice btrfs_misc = { | |
578454ff | 1785 | .minor = BTRFS_MINOR, |
a9218f6b CM |
1786 | .name = "btrfs-control", |
1787 | .fops = &btrfs_ctl_fops | |
1788 | }; | |
1789 | ||
578454ff KS |
1790 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
1791 | MODULE_ALIAS("devname:btrfs-control"); | |
1792 | ||
a9218f6b CM |
1793 | static int btrfs_interface_init(void) |
1794 | { | |
1795 | return misc_register(&btrfs_misc); | |
1796 | } | |
1797 | ||
b2950863 | 1798 | static void btrfs_interface_exit(void) |
a9218f6b CM |
1799 | { |
1800 | if (misc_deregister(&btrfs_misc) < 0) | |
efe120a0 | 1801 | printk(KERN_INFO "BTRFS: misc_deregister failed for control device\n"); |
a9218f6b CM |
1802 | } |
1803 | ||
85965600 DS |
1804 | static void btrfs_print_info(void) |
1805 | { | |
1806 | printk(KERN_INFO "Btrfs loaded" | |
1807 | #ifdef CONFIG_BTRFS_DEBUG | |
1808 | ", debug=on" | |
1809 | #endif | |
79556c3d SB |
1810 | #ifdef CONFIG_BTRFS_ASSERT |
1811 | ", assert=on" | |
1812 | #endif | |
85965600 DS |
1813 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
1814 | ", integrity-checker=on" | |
1815 | #endif | |
1816 | "\n"); | |
1817 | } | |
1818 | ||
dc11dd5d JB |
1819 | static int btrfs_run_sanity_tests(void) |
1820 | { | |
06ea65a3 JB |
1821 | int ret; |
1822 | ||
294e30fe | 1823 | ret = btrfs_init_test_fs(); |
06ea65a3 JB |
1824 | if (ret) |
1825 | return ret; | |
294e30fe JB |
1826 | |
1827 | ret = btrfs_test_free_space_cache(); | |
1828 | if (ret) | |
1829 | goto out; | |
1830 | ret = btrfs_test_extent_buffer_operations(); | |
1831 | if (ret) | |
1832 | goto out; | |
1833 | ret = btrfs_test_extent_io(); | |
aaedb55b JB |
1834 | if (ret) |
1835 | goto out; | |
1836 | ret = btrfs_test_inodes(); | |
294e30fe JB |
1837 | out: |
1838 | btrfs_destroy_test_fs(); | |
1839 | return ret; | |
dc11dd5d JB |
1840 | } |
1841 | ||
2e635a27 CM |
1842 | static int __init init_btrfs_fs(void) |
1843 | { | |
2c90e5d6 | 1844 | int err; |
58176a96 JB |
1845 | |
1846 | err = btrfs_init_sysfs(); | |
1847 | if (err) | |
1848 | return err; | |
1849 | ||
143bede5 | 1850 | btrfs_init_compress(); |
d1310b2e | 1851 | |
261507a0 LZ |
1852 | err = btrfs_init_cachep(); |
1853 | if (err) | |
1854 | goto free_compress; | |
1855 | ||
d1310b2e | 1856 | err = extent_io_init(); |
2f4cbe64 WB |
1857 | if (err) |
1858 | goto free_cachep; | |
1859 | ||
d1310b2e CM |
1860 | err = extent_map_init(); |
1861 | if (err) | |
1862 | goto free_extent_io; | |
1863 | ||
6352b91d | 1864 | err = ordered_data_init(); |
2f4cbe64 WB |
1865 | if (err) |
1866 | goto free_extent_map; | |
c8b97818 | 1867 | |
6352b91d MX |
1868 | err = btrfs_delayed_inode_init(); |
1869 | if (err) | |
1870 | goto free_ordered_data; | |
1871 | ||
9247f317 | 1872 | err = btrfs_auto_defrag_init(); |
16cdcec7 MX |
1873 | if (err) |
1874 | goto free_delayed_inode; | |
1875 | ||
78a6184a | 1876 | err = btrfs_delayed_ref_init(); |
9247f317 MX |
1877 | if (err) |
1878 | goto free_auto_defrag; | |
1879 | ||
b9e9a6cb WS |
1880 | err = btrfs_prelim_ref_init(); |
1881 | if (err) | |
1882 | goto free_prelim_ref; | |
1883 | ||
78a6184a MX |
1884 | err = btrfs_interface_init(); |
1885 | if (err) | |
1886 | goto free_delayed_ref; | |
1887 | ||
e565d4b9 JS |
1888 | btrfs_init_lockdep(); |
1889 | ||
85965600 | 1890 | btrfs_print_info(); |
dc11dd5d JB |
1891 | |
1892 | err = btrfs_run_sanity_tests(); | |
1893 | if (err) | |
1894 | goto unregister_ioctl; | |
1895 | ||
1896 | err = register_filesystem(&btrfs_fs_type); | |
1897 | if (err) | |
1898 | goto unregister_ioctl; | |
74255aa0 | 1899 | |
2f4cbe64 WB |
1900 | return 0; |
1901 | ||
a9218f6b CM |
1902 | unregister_ioctl: |
1903 | btrfs_interface_exit(); | |
b9e9a6cb WS |
1904 | free_prelim_ref: |
1905 | btrfs_prelim_ref_exit(); | |
78a6184a MX |
1906 | free_delayed_ref: |
1907 | btrfs_delayed_ref_exit(); | |
9247f317 MX |
1908 | free_auto_defrag: |
1909 | btrfs_auto_defrag_exit(); | |
16cdcec7 MX |
1910 | free_delayed_inode: |
1911 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
1912 | free_ordered_data: |
1913 | ordered_data_exit(); | |
2f4cbe64 WB |
1914 | free_extent_map: |
1915 | extent_map_exit(); | |
d1310b2e CM |
1916 | free_extent_io: |
1917 | extent_io_exit(); | |
2f4cbe64 WB |
1918 | free_cachep: |
1919 | btrfs_destroy_cachep(); | |
261507a0 LZ |
1920 | free_compress: |
1921 | btrfs_exit_compress(); | |
2f4cbe64 WB |
1922 | btrfs_exit_sysfs(); |
1923 | return err; | |
2e635a27 CM |
1924 | } |
1925 | ||
1926 | static void __exit exit_btrfs_fs(void) | |
1927 | { | |
39279cc3 | 1928 | btrfs_destroy_cachep(); |
78a6184a | 1929 | btrfs_delayed_ref_exit(); |
9247f317 | 1930 | btrfs_auto_defrag_exit(); |
16cdcec7 | 1931 | btrfs_delayed_inode_exit(); |
b9e9a6cb | 1932 | btrfs_prelim_ref_exit(); |
6352b91d | 1933 | ordered_data_exit(); |
a52d9a80 | 1934 | extent_map_exit(); |
d1310b2e | 1935 | extent_io_exit(); |
a9218f6b | 1936 | btrfs_interface_exit(); |
2e635a27 | 1937 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 1938 | btrfs_exit_sysfs(); |
8a4b83cc | 1939 | btrfs_cleanup_fs_uuids(); |
261507a0 | 1940 | btrfs_exit_compress(); |
2e635a27 CM |
1941 | } |
1942 | ||
1943 | module_init(init_btrfs_fs) | |
1944 | module_exit(exit_btrfs_fs) | |
1945 | ||
1946 | MODULE_LICENSE("GPL"); |