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" |
14a958e6 | 51 | #include "hash.h" |
63541927 | 52 | #include "props.h" |
5103e947 | 53 | #include "xattr.h" |
8a4b83cc | 54 | #include "volumes.h" |
be6e8dc0 | 55 | #include "export.h" |
c8b97818 | 56 | #include "compression.h" |
9c5085c1 | 57 | #include "rcu-string.h" |
8dabb742 | 58 | #include "dev-replace.h" |
74255aa0 | 59 | #include "free-space-cache.h" |
b9e9a6cb | 60 | #include "backref.h" |
dc11dd5d | 61 | #include "tests/btrfs-tests.h" |
2e635a27 | 62 | |
1abe9b8a | 63 | #define CREATE_TRACE_POINTS |
64 | #include <trace/events/btrfs.h> | |
65 | ||
b87221de | 66 | static const struct super_operations btrfs_super_ops; |
830c4adb | 67 | static struct file_system_type btrfs_fs_type; |
75dfe396 | 68 | |
0723a047 HH |
69 | static int btrfs_remount(struct super_block *sb, int *flags, char *data); |
70 | ||
08748810 | 71 | static const char *btrfs_decode_error(int errno) |
acce952b | 72 | { |
08748810 | 73 | char *errstr = "unknown"; |
acce952b | 74 | |
75 | switch (errno) { | |
76 | case -EIO: | |
77 | errstr = "IO failure"; | |
78 | break; | |
79 | case -ENOMEM: | |
80 | errstr = "Out of memory"; | |
81 | break; | |
82 | case -EROFS: | |
83 | errstr = "Readonly filesystem"; | |
84 | break; | |
8c342930 JM |
85 | case -EEXIST: |
86 | errstr = "Object already exists"; | |
87 | break; | |
94ef7280 DS |
88 | case -ENOSPC: |
89 | errstr = "No space left"; | |
90 | break; | |
91 | case -ENOENT: | |
92 | errstr = "No such entry"; | |
93 | break; | |
acce952b | 94 | } |
95 | ||
96 | return errstr; | |
97 | } | |
98 | ||
bbece8a3 | 99 | static void save_error_info(struct btrfs_fs_info *fs_info) |
acce952b | 100 | { |
101 | /* | |
102 | * today we only save the error info into ram. Long term we'll | |
103 | * also send it down to the disk | |
104 | */ | |
87533c47 | 105 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); |
acce952b | 106 | } |
107 | ||
acce952b | 108 | /* btrfs handle error by forcing the filesystem readonly */ |
109 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) | |
110 | { | |
111 | struct super_block *sb = fs_info->sb; | |
112 | ||
113 | if (sb->s_flags & MS_RDONLY) | |
114 | return; | |
115 | ||
87533c47 | 116 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
acce952b | 117 | sb->s_flags |= MS_RDONLY; |
c2cf52eb | 118 | btrfs_info(fs_info, "forced readonly"); |
1acd6831 SB |
119 | /* |
120 | * Note that a running device replace operation is not | |
121 | * canceled here although there is no way to update | |
122 | * the progress. It would add the risk of a deadlock, | |
123 | * therefore the canceling is ommited. The only penalty | |
124 | * is that some I/O remains active until the procedure | |
125 | * completes. The next time when the filesystem is | |
126 | * mounted writeable again, the device replace | |
127 | * operation continues. | |
128 | */ | |
acce952b | 129 | } |
130 | } | |
131 | ||
533574c6 | 132 | #ifdef CONFIG_PRINTK |
acce952b | 133 | /* |
134 | * __btrfs_std_error decodes expected errors from the caller and | |
135 | * invokes the approciate error response. | |
136 | */ | |
137 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
4da35113 | 138 | unsigned int line, int errno, const char *fmt, ...) |
acce952b | 139 | { |
140 | struct super_block *sb = fs_info->sb; | |
acce952b | 141 | const char *errstr; |
142 | ||
143 | /* | |
144 | * Special case: if the error is EROFS, and we're already | |
145 | * under MS_RDONLY, then it is safe here. | |
146 | */ | |
147 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
4da35113 JM |
148 | return; |
149 | ||
08748810 | 150 | errstr = btrfs_decode_error(errno); |
4da35113 | 151 | if (fmt) { |
37252a66 ES |
152 | struct va_format vaf; |
153 | va_list args; | |
154 | ||
155 | va_start(args, fmt); | |
156 | vaf.fmt = fmt; | |
157 | vaf.va = &args; | |
4da35113 | 158 | |
efe120a0 FH |
159 | printk(KERN_CRIT |
160 | "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", | |
08748810 | 161 | sb->s_id, function, line, errno, errstr, &vaf); |
37252a66 | 162 | va_end(args); |
4da35113 | 163 | } else { |
efe120a0 | 164 | printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", |
08748810 | 165 | sb->s_id, function, line, errno, errstr); |
4da35113 | 166 | } |
acce952b | 167 | |
4da35113 | 168 | /* Don't go through full error handling during mount */ |
cf79ffb5 JB |
169 | save_error_info(fs_info); |
170 | if (sb->s_flags & MS_BORN) | |
4da35113 | 171 | btrfs_handle_error(fs_info); |
4da35113 | 172 | } |
acce952b | 173 | |
533574c6 | 174 | static const char * const logtypes[] = { |
4da35113 JM |
175 | "emergency", |
176 | "alert", | |
177 | "critical", | |
178 | "error", | |
179 | "warning", | |
180 | "notice", | |
181 | "info", | |
182 | "debug", | |
183 | }; | |
184 | ||
c2cf52eb | 185 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
4da35113 JM |
186 | { |
187 | struct super_block *sb = fs_info->sb; | |
188 | char lvl[4]; | |
189 | struct va_format vaf; | |
190 | va_list args; | |
191 | const char *type = logtypes[4]; | |
533574c6 | 192 | int kern_level; |
4da35113 JM |
193 | |
194 | va_start(args, fmt); | |
195 | ||
533574c6 JP |
196 | kern_level = printk_get_level(fmt); |
197 | if (kern_level) { | |
198 | size_t size = printk_skip_level(fmt) - fmt; | |
199 | memcpy(lvl, fmt, size); | |
200 | lvl[size] = '\0'; | |
201 | fmt += size; | |
202 | type = logtypes[kern_level - '0']; | |
4da35113 JM |
203 | } else |
204 | *lvl = '\0'; | |
205 | ||
206 | vaf.fmt = fmt; | |
207 | vaf.va = &args; | |
533574c6 | 208 | |
c2cf52eb | 209 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); |
533574c6 JP |
210 | |
211 | va_end(args); | |
212 | } | |
213 | ||
214 | #else | |
215 | ||
216 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
217 | unsigned int line, int errno, const char *fmt, ...) | |
218 | { | |
219 | struct super_block *sb = fs_info->sb; | |
220 | ||
221 | /* | |
222 | * Special case: if the error is EROFS, and we're already | |
223 | * under MS_RDONLY, then it is safe here. | |
224 | */ | |
225 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
226 | return; | |
227 | ||
228 | /* Don't go through full error handling during mount */ | |
229 | if (sb->s_flags & MS_BORN) { | |
230 | save_error_info(fs_info); | |
231 | btrfs_handle_error(fs_info); | |
232 | } | |
acce952b | 233 | } |
533574c6 | 234 | #endif |
acce952b | 235 | |
49b25e05 JM |
236 | /* |
237 | * We only mark the transaction aborted and then set the file system read-only. | |
238 | * This will prevent new transactions from starting or trying to join this | |
239 | * one. | |
240 | * | |
241 | * This means that error recovery at the call site is limited to freeing | |
242 | * any local memory allocations and passing the error code up without | |
243 | * further cleanup. The transaction should complete as it normally would | |
244 | * in the call path but will return -EIO. | |
245 | * | |
246 | * We'll complete the cleanup in btrfs_end_transaction and | |
247 | * btrfs_commit_transaction. | |
248 | */ | |
249 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, | |
250 | struct btrfs_root *root, const char *function, | |
251 | unsigned int line, int errno) | |
252 | { | |
08748810 DS |
253 | /* |
254 | * Report first abort since mount | |
255 | */ | |
256 | if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, | |
257 | &root->fs_info->fs_state)) { | |
efe120a0 | 258 | WARN(1, KERN_DEBUG "BTRFS: Transaction aborted (error %d)\n", |
08748810 DS |
259 | errno); |
260 | } | |
49b25e05 JM |
261 | trans->aborted = errno; |
262 | /* Nothing used. The other threads that have joined this | |
263 | * transaction may be able to continue. */ | |
264 | if (!trans->blocks_used) { | |
69ce977a MX |
265 | const char *errstr; |
266 | ||
08748810 | 267 | errstr = btrfs_decode_error(errno); |
c2cf52eb SK |
268 | btrfs_warn(root->fs_info, |
269 | "%s:%d: Aborting unused transaction(%s).", | |
270 | function, line, errstr); | |
acce952b | 271 | return; |
49b25e05 | 272 | } |
8d25a086 | 273 | ACCESS_ONCE(trans->transaction->aborted) = errno; |
501407aa JB |
274 | /* Wake up anybody who may be waiting on this transaction */ |
275 | wake_up(&root->fs_info->transaction_wait); | |
276 | wake_up(&root->fs_info->transaction_blocked_wait); | |
49b25e05 JM |
277 | __btrfs_std_error(root->fs_info, function, line, errno, NULL); |
278 | } | |
8c342930 JM |
279 | /* |
280 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
281 | * issues an alert, and either panics or BUGs, depending on mount options. | |
282 | */ | |
283 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, | |
284 | unsigned int line, int errno, const char *fmt, ...) | |
285 | { | |
8c342930 JM |
286 | char *s_id = "<unknown>"; |
287 | const char *errstr; | |
288 | struct va_format vaf = { .fmt = fmt }; | |
289 | va_list args; | |
acce952b | 290 | |
8c342930 JM |
291 | if (fs_info) |
292 | s_id = fs_info->sb->s_id; | |
acce952b | 293 | |
8c342930 JM |
294 | va_start(args, fmt); |
295 | vaf.va = &args; | |
296 | ||
08748810 | 297 | errstr = btrfs_decode_error(errno); |
aa43a17c | 298 | if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) |
08748810 DS |
299 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
300 | s_id, function, line, &vaf, errno, errstr); | |
8c342930 | 301 | |
efe120a0 FH |
302 | btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", |
303 | function, line, &vaf, errno, errstr); | |
8c342930 JM |
304 | va_end(args); |
305 | /* Caller calls BUG() */ | |
acce952b | 306 | } |
307 | ||
d397712b | 308 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 309 | { |
815745cf | 310 | (void)close_ctree(btrfs_sb(sb)->tree_root); |
aea52e19 AV |
311 | /* FIXME: need to fix VFS to return error? */ |
312 | /* AV: return it _where_? ->put_super() can be triggered by any number | |
313 | * of async events, up to and including delivery of SIGKILL to the | |
314 | * last process that kept it busy. Or segfault in the aforementioned | |
315 | * process... Whom would you report that to? | |
316 | */ | |
75dfe396 CM |
317 | } |
318 | ||
95e05289 | 319 | enum { |
73f73415 | 320 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
321 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
322 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
261507a0 LZ |
323 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
324 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
91435650 | 325 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
9555c6c1 ID |
326 | Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, |
327 | Opt_no_space_cache, Opt_recovery, Opt_skip_balance, | |
21adbd5c | 328 | Opt_check_integrity, Opt_check_integrity_including_extent_data, |
f420ee1e | 329 | Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, |
e07a2ade | 330 | Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, |
a258af7a | 331 | Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, |
3818aea2 | 332 | Opt_datasum, Opt_treelog, Opt_noinode_cache, |
9555c6c1 | 333 | Opt_err, |
95e05289 CM |
334 | }; |
335 | ||
336 | static match_table_t tokens = { | |
dfe25020 | 337 | {Opt_degraded, "degraded"}, |
95e05289 | 338 | {Opt_subvol, "subvol=%s"}, |
1493381f | 339 | {Opt_subvolid, "subvolid=%s"}, |
43e570b0 | 340 | {Opt_device, "device=%s"}, |
b6cda9bc | 341 | {Opt_nodatasum, "nodatasum"}, |
d399167d | 342 | {Opt_datasum, "datasum"}, |
be20aa9d | 343 | {Opt_nodatacow, "nodatacow"}, |
a258af7a | 344 | {Opt_datacow, "datacow"}, |
21ad10cf | 345 | {Opt_nobarrier, "nobarrier"}, |
842bef58 | 346 | {Opt_barrier, "barrier"}, |
6f568d35 | 347 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 348 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 349 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 350 | {Opt_compress, "compress"}, |
261507a0 | 351 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 352 | {Opt_compress_force, "compress-force"}, |
261507a0 | 353 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 354 | {Opt_ssd, "ssd"}, |
451d7585 | 355 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 356 | {Opt_nossd, "nossd"}, |
bd0330ad | 357 | {Opt_acl, "acl"}, |
33268eaf | 358 | {Opt_noacl, "noacl"}, |
3a5e1404 | 359 | {Opt_notreelog, "notreelog"}, |
a88998f2 | 360 | {Opt_treelog, "treelog"}, |
dccae999 | 361 | {Opt_flushoncommit, "flushoncommit"}, |
2c9ee856 | 362 | {Opt_noflushoncommit, "noflushoncommit"}, |
97e728d4 | 363 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 364 | {Opt_discard, "discard"}, |
e07a2ade | 365 | {Opt_nodiscard, "nodiscard"}, |
0af3d00b | 366 | {Opt_space_cache, "space_cache"}, |
88c2ba3b | 367 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 368 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 369 | {Opt_enospc_debug, "enospc_debug"}, |
53036293 | 370 | {Opt_noenospc_debug, "noenospc_debug"}, |
e15d0542 | 371 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 372 | {Opt_defrag, "autodefrag"}, |
fc0ca9af | 373 | {Opt_nodefrag, "noautodefrag"}, |
4b9465cb | 374 | {Opt_inode_cache, "inode_cache"}, |
3818aea2 | 375 | {Opt_noinode_cache, "noinode_cache"}, |
8965593e | 376 | {Opt_no_space_cache, "nospace_cache"}, |
af31f5e5 | 377 | {Opt_recovery, "recovery"}, |
9555c6c1 | 378 | {Opt_skip_balance, "skip_balance"}, |
21adbd5c SB |
379 | {Opt_check_integrity, "check_int"}, |
380 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
381 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, | |
f420ee1e | 382 | {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, |
8c342930 | 383 | {Opt_fatal_errors, "fatal_errors=%s"}, |
8b87dc17 | 384 | {Opt_commit_interval, "commit=%d"}, |
33268eaf | 385 | {Opt_err, NULL}, |
95e05289 CM |
386 | }; |
387 | ||
07802534 QW |
388 | #define btrfs_set_and_info(root, opt, fmt, args...) \ |
389 | { \ | |
390 | if (!btrfs_test_opt(root, opt)) \ | |
391 | btrfs_info(root->fs_info, fmt, ##args); \ | |
392 | btrfs_set_opt(root->fs_info->mount_opt, opt); \ | |
393 | } | |
394 | ||
395 | #define btrfs_clear_and_info(root, opt, fmt, args...) \ | |
396 | { \ | |
397 | if (btrfs_test_opt(root, opt)) \ | |
398 | btrfs_info(root->fs_info, fmt, ##args); \ | |
399 | btrfs_clear_opt(root->fs_info->mount_opt, opt); \ | |
400 | } | |
401 | ||
edf24abe CH |
402 | /* |
403 | * Regular mount options parser. Everything that is needed only when | |
404 | * reading in a new superblock is parsed here. | |
49b25e05 | 405 | * XXX JDM: This needs to be cleaned up for remount. |
edf24abe CH |
406 | */ |
407 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 408 | { |
edf24abe | 409 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 410 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
411 | char *p, *num, *orig = NULL; |
412 | u64 cache_gen; | |
4543df7e | 413 | int intarg; |
a7a3f7ca | 414 | int ret = 0; |
261507a0 LZ |
415 | char *compress_type; |
416 | bool compress_force = false; | |
07802534 | 417 | bool compress = false; |
b6cda9bc | 418 | |
6c41761f | 419 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 JB |
420 | if (cache_gen) |
421 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); | |
422 | ||
95e05289 | 423 | if (!options) |
73bc1876 | 424 | goto out; |
95e05289 | 425 | |
be20aa9d CM |
426 | /* |
427 | * strsep changes the string, duplicate it because parse_options | |
428 | * gets called twice | |
429 | */ | |
430 | options = kstrdup(options, GFP_NOFS); | |
431 | if (!options) | |
432 | return -ENOMEM; | |
433 | ||
da495ecc | 434 | orig = options; |
be20aa9d | 435 | |
edf24abe | 436 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
437 | int token; |
438 | if (!*p) | |
439 | continue; | |
440 | ||
441 | token = match_token(p, tokens, args); | |
442 | switch (token) { | |
dfe25020 | 443 | case Opt_degraded: |
efe120a0 | 444 | btrfs_info(root->fs_info, "allowing degraded mounts"); |
edf24abe | 445 | btrfs_set_opt(info->mount_opt, DEGRADED); |
dfe25020 | 446 | break; |
95e05289 | 447 | case Opt_subvol: |
73f73415 | 448 | case Opt_subvolid: |
e15d0542 | 449 | case Opt_subvolrootid: |
43e570b0 | 450 | case Opt_device: |
edf24abe | 451 | /* |
43e570b0 | 452 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
453 | * and can be happily ignored here. |
454 | */ | |
b6cda9bc CM |
455 | break; |
456 | case Opt_nodatasum: | |
07802534 QW |
457 | btrfs_set_and_info(root, NODATASUM, |
458 | "setting nodatasum"); | |
be20aa9d | 459 | break; |
d399167d | 460 | case Opt_datasum: |
07802534 QW |
461 | if (btrfs_test_opt(root, NODATASUM)) { |
462 | if (btrfs_test_opt(root, NODATACOW)) | |
463 | btrfs_info(root->fs_info, "setting datasum, datacow enabled"); | |
464 | else | |
465 | btrfs_info(root->fs_info, "setting datasum"); | |
466 | } | |
d399167d QW |
467 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
468 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
469 | break; | |
be20aa9d | 470 | case Opt_nodatacow: |
07802534 QW |
471 | if (!btrfs_test_opt(root, NODATACOW)) { |
472 | if (!btrfs_test_opt(root, COMPRESS) || | |
473 | !btrfs_test_opt(root, FORCE_COMPRESS)) { | |
efe120a0 | 474 | btrfs_info(root->fs_info, |
07802534 QW |
475 | "setting nodatacow, compression disabled"); |
476 | } else { | |
477 | btrfs_info(root->fs_info, "setting nodatacow"); | |
478 | } | |
bedb2cca | 479 | } |
bedb2cca AP |
480 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
481 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
edf24abe CH |
482 | btrfs_set_opt(info->mount_opt, NODATACOW); |
483 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 484 | break; |
a258af7a | 485 | case Opt_datacow: |
07802534 QW |
486 | btrfs_clear_and_info(root, NODATACOW, |
487 | "setting datacow"); | |
a258af7a | 488 | break; |
a555f810 | 489 | case Opt_compress_force: |
261507a0 LZ |
490 | case Opt_compress_force_type: |
491 | compress_force = true; | |
1c697d4a | 492 | /* Fallthrough */ |
261507a0 LZ |
493 | case Opt_compress: |
494 | case Opt_compress_type: | |
07802534 | 495 | compress = true; |
261507a0 LZ |
496 | if (token == Opt_compress || |
497 | token == Opt_compress_force || | |
498 | strcmp(args[0].from, "zlib") == 0) { | |
499 | compress_type = "zlib"; | |
500 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
063849ea | 501 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
502 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
503 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
a6fa6fae LZ |
504 | } else if (strcmp(args[0].from, "lzo") == 0) { |
505 | compress_type = "lzo"; | |
506 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 507 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
508 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
509 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
2b0ce2c2 | 510 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
063849ea AH |
511 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
512 | compress_type = "no"; | |
063849ea AH |
513 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
514 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
515 | compress_force = false; | |
261507a0 LZ |
516 | } else { |
517 | ret = -EINVAL; | |
518 | goto out; | |
519 | } | |
520 | ||
261507a0 | 521 | if (compress_force) { |
07802534 QW |
522 | btrfs_set_and_info(root, FORCE_COMPRESS, |
523 | "force %s compression", | |
524 | compress_type); | |
525 | } else if (compress) { | |
526 | if (!btrfs_test_opt(root, COMPRESS)) | |
527 | btrfs_info(root->fs_info, | |
528 | "btrfs: use %s compression\n", | |
529 | compress_type); | |
a7e252af | 530 | } |
a555f810 | 531 | break; |
e18e4809 | 532 | case Opt_ssd: |
07802534 QW |
533 | btrfs_set_and_info(root, SSD, |
534 | "use ssd allocation scheme"); | |
e18e4809 | 535 | break; |
451d7585 | 536 | case Opt_ssd_spread: |
07802534 QW |
537 | btrfs_set_and_info(root, SSD_SPREAD, |
538 | "use spread ssd allocation scheme"); | |
451d7585 | 539 | break; |
3b30c22f | 540 | case Opt_nossd: |
07802534 QW |
541 | btrfs_clear_and_info(root, NOSSD, |
542 | "not using ssd allocation scheme"); | |
3b30c22f CM |
543 | btrfs_clear_opt(info->mount_opt, SSD); |
544 | break; | |
842bef58 | 545 | case Opt_barrier: |
07802534 QW |
546 | btrfs_clear_and_info(root, NOBARRIER, |
547 | "turning on barriers"); | |
842bef58 | 548 | break; |
21ad10cf | 549 | case Opt_nobarrier: |
07802534 QW |
550 | btrfs_set_and_info(root, NOBARRIER, |
551 | "turning off barriers"); | |
21ad10cf | 552 | break; |
4543df7e | 553 | case Opt_thread_pool: |
2c334e87 WS |
554 | ret = match_int(&args[0], &intarg); |
555 | if (ret) { | |
556 | goto out; | |
557 | } else if (intarg > 0) { | |
4543df7e | 558 | info->thread_pool_size = intarg; |
2c334e87 WS |
559 | } else { |
560 | ret = -EINVAL; | |
561 | goto out; | |
562 | } | |
4543df7e | 563 | break; |
6f568d35 | 564 | case Opt_max_inline: |
edf24abe CH |
565 | num = match_strdup(&args[0]); |
566 | if (num) { | |
91748467 | 567 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
568 | kfree(num); |
569 | ||
15ada040 | 570 | if (info->max_inline) { |
feb5f965 | 571 | info->max_inline = min_t(u64, |
15ada040 CM |
572 | info->max_inline, |
573 | root->sectorsize); | |
574 | } | |
efe120a0 | 575 | btrfs_info(root->fs_info, "max_inline at %llu", |
c1c9ff7c | 576 | info->max_inline); |
2c334e87 WS |
577 | } else { |
578 | ret = -ENOMEM; | |
579 | goto out; | |
6f568d35 CM |
580 | } |
581 | break; | |
8f662a76 | 582 | case Opt_alloc_start: |
edf24abe CH |
583 | num = match_strdup(&args[0]); |
584 | if (num) { | |
c018daec | 585 | mutex_lock(&info->chunk_mutex); |
91748467 | 586 | info->alloc_start = memparse(num, NULL); |
c018daec | 587 | mutex_unlock(&info->chunk_mutex); |
edf24abe | 588 | kfree(num); |
efe120a0 | 589 | btrfs_info(root->fs_info, "allocations start at %llu", |
c1c9ff7c | 590 | info->alloc_start); |
2c334e87 WS |
591 | } else { |
592 | ret = -ENOMEM; | |
593 | goto out; | |
8f662a76 CM |
594 | } |
595 | break; | |
bd0330ad QW |
596 | case Opt_acl: |
597 | root->fs_info->sb->s_flags |= MS_POSIXACL; | |
598 | break; | |
33268eaf JB |
599 | case Opt_noacl: |
600 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
601 | break; | |
3a5e1404 | 602 | case Opt_notreelog: |
07802534 QW |
603 | btrfs_set_and_info(root, NOTREELOG, |
604 | "disabling tree log"); | |
a88998f2 QW |
605 | break; |
606 | case Opt_treelog: | |
07802534 QW |
607 | btrfs_clear_and_info(root, NOTREELOG, |
608 | "enabling tree log"); | |
3a5e1404 | 609 | break; |
dccae999 | 610 | case Opt_flushoncommit: |
07802534 QW |
611 | btrfs_set_and_info(root, FLUSHONCOMMIT, |
612 | "turning on flush-on-commit"); | |
dccae999 | 613 | break; |
2c9ee856 | 614 | case Opt_noflushoncommit: |
07802534 QW |
615 | btrfs_clear_and_info(root, FLUSHONCOMMIT, |
616 | "turning off flush-on-commit"); | |
2c9ee856 | 617 | break; |
97e728d4 | 618 | case Opt_ratio: |
2c334e87 WS |
619 | ret = match_int(&args[0], &intarg); |
620 | if (ret) { | |
621 | goto out; | |
622 | } else if (intarg >= 0) { | |
97e728d4 | 623 | info->metadata_ratio = intarg; |
efe120a0 | 624 | btrfs_info(root->fs_info, "metadata ratio %d", |
97e728d4 | 625 | info->metadata_ratio); |
2c334e87 WS |
626 | } else { |
627 | ret = -EINVAL; | |
628 | goto out; | |
97e728d4 JB |
629 | } |
630 | break; | |
e244a0ae | 631 | case Opt_discard: |
07802534 QW |
632 | btrfs_set_and_info(root, DISCARD, |
633 | "turning on discard"); | |
e244a0ae | 634 | break; |
e07a2ade | 635 | case Opt_nodiscard: |
07802534 QW |
636 | btrfs_clear_and_info(root, DISCARD, |
637 | "turning off discard"); | |
e07a2ade | 638 | break; |
0af3d00b | 639 | case Opt_space_cache: |
07802534 QW |
640 | btrfs_set_and_info(root, SPACE_CACHE, |
641 | "enabling disk space caching"); | |
0de90876 | 642 | break; |
f420ee1e SB |
643 | case Opt_rescan_uuid_tree: |
644 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); | |
645 | break; | |
73bc1876 | 646 | case Opt_no_space_cache: |
07802534 QW |
647 | btrfs_clear_and_info(root, SPACE_CACHE, |
648 | "disabling disk space caching"); | |
73bc1876 | 649 | break; |
4b9465cb | 650 | case Opt_inode_cache: |
07802534 QW |
651 | btrfs_set_and_info(root, CHANGE_INODE_CACHE, |
652 | "enabling inode map caching"); | |
3818aea2 QW |
653 | break; |
654 | case Opt_noinode_cache: | |
07802534 QW |
655 | btrfs_clear_and_info(root, CHANGE_INODE_CACHE, |
656 | "disabling inode map caching"); | |
4b9465cb | 657 | break; |
88c2ba3b | 658 | case Opt_clear_cache: |
07802534 QW |
659 | btrfs_set_and_info(root, CLEAR_CACHE, |
660 | "force clearing of disk cache"); | |
0af3d00b | 661 | break; |
4260f7c7 SW |
662 | case Opt_user_subvol_rm_allowed: |
663 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
664 | break; | |
91435650 CM |
665 | case Opt_enospc_debug: |
666 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
667 | break; | |
53036293 QW |
668 | case Opt_noenospc_debug: |
669 | btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); | |
670 | break; | |
4cb5300b | 671 | case Opt_defrag: |
07802534 QW |
672 | btrfs_set_and_info(root, AUTO_DEFRAG, |
673 | "enabling auto defrag"); | |
4cb5300b | 674 | break; |
fc0ca9af | 675 | case Opt_nodefrag: |
07802534 QW |
676 | btrfs_clear_and_info(root, AUTO_DEFRAG, |
677 | "disabling auto defrag"); | |
fc0ca9af | 678 | break; |
af31f5e5 | 679 | case Opt_recovery: |
efe120a0 | 680 | btrfs_info(root->fs_info, "enabling auto recovery"); |
af31f5e5 CM |
681 | btrfs_set_opt(info->mount_opt, RECOVERY); |
682 | break; | |
9555c6c1 ID |
683 | case Opt_skip_balance: |
684 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
685 | break; | |
21adbd5c SB |
686 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
687 | case Opt_check_integrity_including_extent_data: | |
efe120a0 FH |
688 | btrfs_info(root->fs_info, |
689 | "enabling check integrity including extent data"); | |
21adbd5c SB |
690 | btrfs_set_opt(info->mount_opt, |
691 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
692 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
693 | break; | |
694 | case Opt_check_integrity: | |
efe120a0 | 695 | btrfs_info(root->fs_info, "enabling check integrity"); |
21adbd5c SB |
696 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
697 | break; | |
698 | case Opt_check_integrity_print_mask: | |
2c334e87 WS |
699 | ret = match_int(&args[0], &intarg); |
700 | if (ret) { | |
701 | goto out; | |
702 | } else if (intarg >= 0) { | |
21adbd5c | 703 | info->check_integrity_print_mask = intarg; |
efe120a0 | 704 | btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", |
21adbd5c | 705 | info->check_integrity_print_mask); |
2c334e87 WS |
706 | } else { |
707 | ret = -EINVAL; | |
708 | goto out; | |
21adbd5c SB |
709 | } |
710 | break; | |
711 | #else | |
712 | case Opt_check_integrity_including_extent_data: | |
713 | case Opt_check_integrity: | |
714 | case Opt_check_integrity_print_mask: | |
efe120a0 FH |
715 | btrfs_err(root->fs_info, |
716 | "support for check_integrity* not compiled in!"); | |
21adbd5c SB |
717 | ret = -EINVAL; |
718 | goto out; | |
719 | #endif | |
8c342930 JM |
720 | case Opt_fatal_errors: |
721 | if (strcmp(args[0].from, "panic") == 0) | |
722 | btrfs_set_opt(info->mount_opt, | |
723 | PANIC_ON_FATAL_ERROR); | |
724 | else if (strcmp(args[0].from, "bug") == 0) | |
725 | btrfs_clear_opt(info->mount_opt, | |
726 | PANIC_ON_FATAL_ERROR); | |
727 | else { | |
728 | ret = -EINVAL; | |
729 | goto out; | |
730 | } | |
731 | break; | |
8b87dc17 DS |
732 | case Opt_commit_interval: |
733 | intarg = 0; | |
734 | ret = match_int(&args[0], &intarg); | |
735 | if (ret < 0) { | |
efe120a0 | 736 | btrfs_err(root->fs_info, "invalid commit interval"); |
8b87dc17 DS |
737 | ret = -EINVAL; |
738 | goto out; | |
739 | } | |
740 | if (intarg > 0) { | |
741 | if (intarg > 300) { | |
efe120a0 | 742 | btrfs_warn(root->fs_info, "excessive commit interval %d", |
8b87dc17 DS |
743 | intarg); |
744 | } | |
745 | info->commit_interval = intarg; | |
746 | } else { | |
efe120a0 | 747 | btrfs_info(root->fs_info, "using default commit interval %ds", |
8b87dc17 DS |
748 | BTRFS_DEFAULT_COMMIT_INTERVAL); |
749 | info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; | |
750 | } | |
751 | break; | |
a7a3f7ca | 752 | case Opt_err: |
efe120a0 | 753 | btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); |
a7a3f7ca SW |
754 | ret = -EINVAL; |
755 | goto out; | |
95e05289 | 756 | default: |
be20aa9d | 757 | break; |
95e05289 CM |
758 | } |
759 | } | |
a7a3f7ca | 760 | out: |
73bc1876 | 761 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
efe120a0 | 762 | btrfs_info(root->fs_info, "disk space caching is enabled"); |
da495ecc | 763 | kfree(orig); |
a7a3f7ca | 764 | return ret; |
edf24abe CH |
765 | } |
766 | ||
767 | /* | |
768 | * Parse mount options that are required early in the mount process. | |
769 | * | |
770 | * All other options will be parsed on much later in the mount process and | |
771 | * only when we need to allocate a new super block. | |
772 | */ | |
97288f2c | 773 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 774 | void *holder, char **subvol_name, u64 *subvol_objectid, |
5e2a4b25 | 775 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
776 | { |
777 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 778 | char *device_name, *opts, *orig, *p; |
1493381f | 779 | char *num = NULL; |
edf24abe CH |
780 | int error = 0; |
781 | ||
782 | if (!options) | |
830c4adb | 783 | return 0; |
edf24abe CH |
784 | |
785 | /* | |
786 | * strsep changes the string, duplicate it because parse_options | |
787 | * gets called twice | |
788 | */ | |
789 | opts = kstrdup(options, GFP_KERNEL); | |
790 | if (!opts) | |
791 | return -ENOMEM; | |
3f3d0bc0 | 792 | orig = opts; |
edf24abe CH |
793 | |
794 | while ((p = strsep(&opts, ",")) != NULL) { | |
795 | int token; | |
796 | if (!*p) | |
797 | continue; | |
798 | ||
799 | token = match_token(p, tokens, args); | |
800 | switch (token) { | |
801 | case Opt_subvol: | |
a90e8b6f | 802 | kfree(*subvol_name); |
edf24abe | 803 | *subvol_name = match_strdup(&args[0]); |
2c334e87 WS |
804 | if (!*subvol_name) { |
805 | error = -ENOMEM; | |
806 | goto out; | |
807 | } | |
edf24abe | 808 | break; |
73f73415 | 809 | case Opt_subvolid: |
1493381f WS |
810 | num = match_strdup(&args[0]); |
811 | if (num) { | |
812 | *subvol_objectid = memparse(num, NULL); | |
813 | kfree(num); | |
4849f01d | 814 | /* we want the original fs_tree */ |
1493381f | 815 | if (!*subvol_objectid) |
4849f01d JB |
816 | *subvol_objectid = |
817 | BTRFS_FS_TREE_OBJECTID; | |
2c334e87 WS |
818 | } else { |
819 | error = -EINVAL; | |
820 | goto out; | |
4849f01d | 821 | } |
73f73415 | 822 | break; |
e15d0542 | 823 | case Opt_subvolrootid: |
5e2a4b25 | 824 | printk(KERN_WARNING |
efe120a0 FH |
825 | "BTRFS: 'subvolrootid' mount option is deprecated and has " |
826 | "no effect\n"); | |
e15d0542 | 827 | break; |
43e570b0 | 828 | case Opt_device: |
83c8c9bd JL |
829 | device_name = match_strdup(&args[0]); |
830 | if (!device_name) { | |
831 | error = -ENOMEM; | |
832 | goto out; | |
833 | } | |
834 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 835 | flags, holder, fs_devices); |
83c8c9bd | 836 | kfree(device_name); |
43e570b0 | 837 | if (error) |
830c4adb | 838 | goto out; |
43e570b0 | 839 | break; |
edf24abe CH |
840 | default: |
841 | break; | |
842 | } | |
843 | } | |
844 | ||
830c4adb | 845 | out: |
3f3d0bc0 | 846 | kfree(orig); |
edf24abe | 847 | return error; |
95e05289 CM |
848 | } |
849 | ||
73f73415 JB |
850 | static struct dentry *get_default_root(struct super_block *sb, |
851 | u64 subvol_objectid) | |
852 | { | |
815745cf AV |
853 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
854 | struct btrfs_root *root = fs_info->tree_root; | |
73f73415 JB |
855 | struct btrfs_root *new_root; |
856 | struct btrfs_dir_item *di; | |
857 | struct btrfs_path *path; | |
858 | struct btrfs_key location; | |
859 | struct inode *inode; | |
3a0dfa6a | 860 | struct dentry *dentry; |
73f73415 JB |
861 | u64 dir_id; |
862 | int new = 0; | |
863 | ||
864 | /* | |
865 | * We have a specific subvol we want to mount, just setup location and | |
866 | * go look up the root. | |
867 | */ | |
868 | if (subvol_objectid) { | |
869 | location.objectid = subvol_objectid; | |
870 | location.type = BTRFS_ROOT_ITEM_KEY; | |
871 | location.offset = (u64)-1; | |
872 | goto find_root; | |
873 | } | |
874 | ||
875 | path = btrfs_alloc_path(); | |
876 | if (!path) | |
877 | return ERR_PTR(-ENOMEM); | |
878 | path->leave_spinning = 1; | |
879 | ||
880 | /* | |
881 | * Find the "default" dir item which points to the root item that we | |
882 | * will mount by default if we haven't been given a specific subvolume | |
883 | * to mount. | |
884 | */ | |
815745cf | 885 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 886 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
887 | if (IS_ERR(di)) { |
888 | btrfs_free_path(path); | |
fb4f6f91 | 889 | return ERR_CAST(di); |
b0839166 | 890 | } |
73f73415 JB |
891 | if (!di) { |
892 | /* | |
893 | * Ok the default dir item isn't there. This is weird since | |
894 | * it's always been there, but don't freak out, just try and | |
895 | * mount to root most subvolume. | |
896 | */ | |
897 | btrfs_free_path(path); | |
898 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
815745cf | 899 | new_root = fs_info->fs_root; |
73f73415 JB |
900 | goto setup_root; |
901 | } | |
902 | ||
903 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
904 | btrfs_free_path(path); | |
905 | ||
906 | find_root: | |
815745cf | 907 | new_root = btrfs_read_fs_root_no_name(fs_info, &location); |
73f73415 | 908 | if (IS_ERR(new_root)) |
d0b678cb | 909 | return ERR_CAST(new_root); |
73f73415 | 910 | |
73f73415 JB |
911 | dir_id = btrfs_root_dirid(&new_root->root_item); |
912 | setup_root: | |
913 | location.objectid = dir_id; | |
914 | location.type = BTRFS_INODE_ITEM_KEY; | |
915 | location.offset = 0; | |
916 | ||
917 | inode = btrfs_iget(sb, &location, new_root, &new); | |
4cbd1149 DC |
918 | if (IS_ERR(inode)) |
919 | return ERR_CAST(inode); | |
73f73415 JB |
920 | |
921 | /* | |
922 | * If we're just mounting the root most subvol put the inode and return | |
923 | * a reference to the dentry. We will have already gotten a reference | |
924 | * to the inode in btrfs_fill_super so we're good to go. | |
925 | */ | |
926 | if (!new && sb->s_root->d_inode == inode) { | |
927 | iput(inode); | |
928 | return dget(sb->s_root); | |
929 | } | |
930 | ||
3a0dfa6a JB |
931 | dentry = d_obtain_alias(inode); |
932 | if (!IS_ERR(dentry)) { | |
933 | spin_lock(&dentry->d_lock); | |
934 | dentry->d_flags &= ~DCACHE_DISCONNECTED; | |
935 | spin_unlock(&dentry->d_lock); | |
936 | } | |
937 | return dentry; | |
73f73415 JB |
938 | } |
939 | ||
d397712b | 940 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 941 | struct btrfs_fs_devices *fs_devices, |
d397712b | 942 | void *data, int silent) |
75dfe396 | 943 | { |
d397712b | 944 | struct inode *inode; |
815745cf | 945 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 946 | struct btrfs_key key; |
39279cc3 | 947 | int err; |
a429e513 | 948 | |
39279cc3 CM |
949 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
950 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
951 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 952 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 953 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 954 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 955 | sb->s_time_gran = 1; |
0eda294d | 956 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 957 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 958 | #endif |
0c4d2d95 | 959 | sb->s_flags |= MS_I_VERSION; |
ad2b2c80 AV |
960 | err = open_ctree(sb, fs_devices, (char *)data); |
961 | if (err) { | |
efe120a0 | 962 | printk(KERN_ERR "BTRFS: open_ctree failed\n"); |
ad2b2c80 | 963 | return err; |
a429e513 CM |
964 | } |
965 | ||
5d4f98a2 YZ |
966 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
967 | key.type = BTRFS_INODE_ITEM_KEY; | |
968 | key.offset = 0; | |
98c7089c | 969 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
970 | if (IS_ERR(inode)) { |
971 | err = PTR_ERR(inode); | |
39279cc3 | 972 | goto fail_close; |
f254e52c | 973 | } |
f254e52c | 974 | |
48fde701 AV |
975 | sb->s_root = d_make_root(inode); |
976 | if (!sb->s_root) { | |
39279cc3 CM |
977 | err = -ENOMEM; |
978 | goto fail_close; | |
f254e52c | 979 | } |
58176a96 | 980 | |
6885f308 | 981 | save_mount_options(sb, data); |
90a887c9 | 982 | cleancache_init_fs(sb); |
59553edf | 983 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 984 | return 0; |
39279cc3 CM |
985 | |
986 | fail_close: | |
815745cf | 987 | close_ctree(fs_info->tree_root); |
39279cc3 | 988 | return err; |
2619ba1f CM |
989 | } |
990 | ||
6bf13c0c | 991 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
992 | { |
993 | struct btrfs_trans_handle *trans; | |
815745cf AV |
994 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
995 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 996 | |
1abe9b8a | 997 | trace_btrfs_sync_fs(wait); |
998 | ||
39279cc3 | 999 | if (!wait) { |
815745cf | 1000 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
1001 | return 0; |
1002 | } | |
771ed689 | 1003 | |
b0244199 | 1004 | btrfs_wait_ordered_roots(fs_info, -1); |
771ed689 | 1005 | |
d4edf39b | 1006 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 1007 | if (IS_ERR(trans)) { |
354aa0fb MX |
1008 | /* no transaction, don't bother */ |
1009 | if (PTR_ERR(trans) == -ENOENT) | |
60376ce4 | 1010 | return 0; |
98d5dc13 | 1011 | return PTR_ERR(trans); |
60376ce4 | 1012 | } |
bd7de2c9 | 1013 | return btrfs_commit_transaction(trans, root); |
2c90e5d6 CM |
1014 | } |
1015 | ||
34c80b1d | 1016 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 1017 | { |
815745cf AV |
1018 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
1019 | struct btrfs_root *root = info->tree_root; | |
200da64e | 1020 | char *compress_type; |
a9572a15 EP |
1021 | |
1022 | if (btrfs_test_opt(root, DEGRADED)) | |
1023 | seq_puts(seq, ",degraded"); | |
1024 | if (btrfs_test_opt(root, NODATASUM)) | |
1025 | seq_puts(seq, ",nodatasum"); | |
1026 | if (btrfs_test_opt(root, NODATACOW)) | |
1027 | seq_puts(seq, ",nodatacow"); | |
1028 | if (btrfs_test_opt(root, NOBARRIER)) | |
1029 | seq_puts(seq, ",nobarrier"); | |
a9572a15 | 1030 | if (info->max_inline != 8192 * 1024) |
c1c9ff7c | 1031 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
a9572a15 | 1032 | if (info->alloc_start != 0) |
c1c9ff7c | 1033 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); |
a9572a15 EP |
1034 | if (info->thread_pool_size != min_t(unsigned long, |
1035 | num_online_cpus() + 2, 8)) | |
1036 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
200da64e TI |
1037 | if (btrfs_test_opt(root, COMPRESS)) { |
1038 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) | |
1039 | compress_type = "zlib"; | |
1040 | else | |
1041 | compress_type = "lzo"; | |
1042 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
1043 | seq_printf(seq, ",compress-force=%s", compress_type); | |
1044 | else | |
1045 | seq_printf(seq, ",compress=%s", compress_type); | |
1046 | } | |
c289811c CM |
1047 | if (btrfs_test_opt(root, NOSSD)) |
1048 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
1049 | if (btrfs_test_opt(root, SSD_SPREAD)) |
1050 | seq_puts(seq, ",ssd_spread"); | |
1051 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 1052 | seq_puts(seq, ",ssd"); |
3a5e1404 | 1053 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 1054 | seq_puts(seq, ",notreelog"); |
dccae999 | 1055 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 1056 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
1057 | if (btrfs_test_opt(root, DISCARD)) |
1058 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
1059 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
1060 | seq_puts(seq, ",noacl"); | |
200da64e TI |
1061 | if (btrfs_test_opt(root, SPACE_CACHE)) |
1062 | seq_puts(seq, ",space_cache"); | |
73bc1876 | 1063 | else |
8965593e | 1064 | seq_puts(seq, ",nospace_cache"); |
f420ee1e SB |
1065 | if (btrfs_test_opt(root, RESCAN_UUID_TREE)) |
1066 | seq_puts(seq, ",rescan_uuid_tree"); | |
200da64e TI |
1067 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
1068 | seq_puts(seq, ",clear_cache"); | |
1069 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
1070 | seq_puts(seq, ",user_subvol_rm_allowed"); | |
0942caa3 DS |
1071 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
1072 | seq_puts(seq, ",enospc_debug"); | |
1073 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
1074 | seq_puts(seq, ",autodefrag"); | |
1075 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) | |
1076 | seq_puts(seq, ",inode_cache"); | |
9555c6c1 ID |
1077 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
1078 | seq_puts(seq, ",skip_balance"); | |
8507d216 WS |
1079 | if (btrfs_test_opt(root, RECOVERY)) |
1080 | seq_puts(seq, ",recovery"); | |
1081 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
1082 | if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) | |
1083 | seq_puts(seq, ",check_int_data"); | |
1084 | else if (btrfs_test_opt(root, CHECK_INTEGRITY)) | |
1085 | seq_puts(seq, ",check_int"); | |
1086 | if (info->check_integrity_print_mask) | |
1087 | seq_printf(seq, ",check_int_print_mask=%d", | |
1088 | info->check_integrity_print_mask); | |
1089 | #endif | |
1090 | if (info->metadata_ratio) | |
1091 | seq_printf(seq, ",metadata_ratio=%d", | |
1092 | info->metadata_ratio); | |
8c342930 JM |
1093 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
1094 | seq_puts(seq, ",fatal_errors=panic"); | |
8b87dc17 DS |
1095 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
1096 | seq_printf(seq, ",commit=%d", info->commit_interval); | |
a9572a15 EP |
1097 | return 0; |
1098 | } | |
1099 | ||
a061fc8d | 1100 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 1101 | { |
815745cf AV |
1102 | struct btrfs_fs_info *p = data; |
1103 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 1104 | |
815745cf | 1105 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
1106 | } |
1107 | ||
450ba0ea JB |
1108 | static int btrfs_set_super(struct super_block *s, void *data) |
1109 | { | |
6de1d09d AV |
1110 | int err = set_anon_super(s, data); |
1111 | if (!err) | |
1112 | s->s_fs_info = data; | |
1113 | return err; | |
4b82d6e4 Y |
1114 | } |
1115 | ||
f9d9ef62 DS |
1116 | /* |
1117 | * subvolumes are identified by ino 256 | |
1118 | */ | |
1119 | static inline int is_subvolume_inode(struct inode *inode) | |
1120 | { | |
1121 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1122 | return 1; | |
1123 | return 0; | |
1124 | } | |
1125 | ||
830c4adb JB |
1126 | /* |
1127 | * This will strip out the subvol=%s argument for an argument string and add | |
1128 | * subvolid=0 to make sure we get the actual tree root for path walking to the | |
1129 | * subvol we want. | |
1130 | */ | |
1131 | static char *setup_root_args(char *args) | |
1132 | { | |
f60d16a8 JM |
1133 | unsigned len = strlen(args) + 2 + 1; |
1134 | char *src, *dst, *buf; | |
830c4adb JB |
1135 | |
1136 | /* | |
f60d16a8 JM |
1137 | * We need the same args as before, but with this substitution: |
1138 | * s!subvol=[^,]+!subvolid=0! | |
830c4adb | 1139 | * |
f60d16a8 JM |
1140 | * Since the replacement string is up to 2 bytes longer than the |
1141 | * original, allocate strlen(args) + 2 + 1 bytes. | |
830c4adb | 1142 | */ |
830c4adb | 1143 | |
f60d16a8 | 1144 | src = strstr(args, "subvol="); |
830c4adb | 1145 | /* This shouldn't happen, but just in case.. */ |
f60d16a8 JM |
1146 | if (!src) |
1147 | return NULL; | |
1148 | ||
1149 | buf = dst = kmalloc(len, GFP_NOFS); | |
1150 | if (!buf) | |
830c4adb | 1151 | return NULL; |
830c4adb JB |
1152 | |
1153 | /* | |
f60d16a8 JM |
1154 | * If the subvol= arg is not at the start of the string, |
1155 | * copy whatever precedes it into buf. | |
830c4adb | 1156 | */ |
f60d16a8 JM |
1157 | if (src != args) { |
1158 | *src++ = '\0'; | |
1159 | strcpy(buf, args); | |
1160 | dst += strlen(args); | |
830c4adb JB |
1161 | } |
1162 | ||
f60d16a8 JM |
1163 | strcpy(dst, "subvolid=0"); |
1164 | dst += strlen("subvolid=0"); | |
830c4adb JB |
1165 | |
1166 | /* | |
f60d16a8 JM |
1167 | * If there is a "," after the original subvol=... string, |
1168 | * copy that suffix into our buffer. Otherwise, we're done. | |
830c4adb | 1169 | */ |
f60d16a8 JM |
1170 | src = strchr(src, ','); |
1171 | if (src) | |
1172 | strcpy(dst, src); | |
830c4adb | 1173 | |
f60d16a8 | 1174 | return buf; |
830c4adb JB |
1175 | } |
1176 | ||
1177 | static struct dentry *mount_subvol(const char *subvol_name, int flags, | |
1178 | const char *device_name, char *data) | |
1179 | { | |
830c4adb JB |
1180 | struct dentry *root; |
1181 | struct vfsmount *mnt; | |
830c4adb | 1182 | char *newargs; |
830c4adb JB |
1183 | |
1184 | newargs = setup_root_args(data); | |
1185 | if (!newargs) | |
1186 | return ERR_PTR(-ENOMEM); | |
1187 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, | |
1188 | newargs); | |
1189 | kfree(newargs); | |
0723a047 HH |
1190 | |
1191 | if (PTR_RET(mnt) == -EBUSY) { | |
1192 | if (flags & MS_RDONLY) { | |
1193 | mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, device_name, | |
1194 | newargs); | |
1195 | } else { | |
1196 | int r; | |
1197 | mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, device_name, | |
1198 | newargs); | |
1199 | if (IS_ERR(mnt)) | |
1200 | return ERR_CAST(mnt); | |
1201 | ||
1202 | r = btrfs_remount(mnt->mnt_sb, &flags, NULL); | |
1203 | if (r < 0) { | |
1204 | /* FIXME: release vfsmount mnt ??*/ | |
1205 | return ERR_PTR(r); | |
1206 | } | |
1207 | } | |
1208 | } | |
1209 | ||
830c4adb JB |
1210 | if (IS_ERR(mnt)) |
1211 | return ERR_CAST(mnt); | |
1212 | ||
ea441d11 | 1213 | root = mount_subtree(mnt, subvol_name); |
830c4adb | 1214 | |
ea441d11 AV |
1215 | if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { |
1216 | struct super_block *s = root->d_sb; | |
1217 | dput(root); | |
1218 | root = ERR_PTR(-EINVAL); | |
1219 | deactivate_locked_super(s); | |
efe120a0 | 1220 | printk(KERN_ERR "BTRFS: '%s' is not a valid subvolume\n", |
f9d9ef62 | 1221 | subvol_name); |
f9d9ef62 DS |
1222 | } |
1223 | ||
830c4adb JB |
1224 | return root; |
1225 | } | |
450ba0ea | 1226 | |
edf24abe CH |
1227 | /* |
1228 | * Find a superblock for the given device / mount point. | |
1229 | * | |
1230 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1231 | * for multiple device setup. Make sure to keep it in sync. | |
1232 | */ | |
061dbc6b | 1233 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1234 | const char *device_name, void *data) |
4b82d6e4 Y |
1235 | { |
1236 | struct block_device *bdev = NULL; | |
1237 | struct super_block *s; | |
1238 | struct dentry *root; | |
8a4b83cc | 1239 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 1240 | struct btrfs_fs_info *fs_info = NULL; |
97288f2c | 1241 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1242 | char *subvol_name = NULL; |
1243 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
1244 | int error = 0; |
1245 | ||
97288f2c CH |
1246 | if (!(flags & MS_RDONLY)) |
1247 | mode |= FMODE_WRITE; | |
1248 | ||
1249 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 1250 | &subvol_name, &subvol_objectid, |
5e2a4b25 | 1251 | &fs_devices); |
f23c8af8 ID |
1252 | if (error) { |
1253 | kfree(subvol_name); | |
061dbc6b | 1254 | return ERR_PTR(error); |
f23c8af8 | 1255 | } |
edf24abe | 1256 | |
830c4adb JB |
1257 | if (subvol_name) { |
1258 | root = mount_subvol(subvol_name, flags, device_name, data); | |
1259 | kfree(subvol_name); | |
1260 | return root; | |
1261 | } | |
1262 | ||
306e16ce | 1263 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 1264 | if (error) |
830c4adb | 1265 | return ERR_PTR(error); |
4b82d6e4 | 1266 | |
450ba0ea JB |
1267 | /* |
1268 | * Setup a dummy root and fs_info for test/set super. This is because | |
1269 | * we don't actually fill this stuff out until open_ctree, but we need | |
1270 | * it for searching for existing supers, so this lets us do that and | |
1271 | * then open_ctree will properly initialize everything later. | |
1272 | */ | |
1273 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
04d21a24 ID |
1274 | if (!fs_info) |
1275 | return ERR_PTR(-ENOMEM); | |
1276 | ||
450ba0ea | 1277 | fs_info->fs_devices = fs_devices; |
450ba0ea | 1278 | |
6c41761f DS |
1279 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
1280 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
1281 | if (!fs_info->super_copy || !fs_info->super_for_commit) { | |
1282 | error = -ENOMEM; | |
04d21a24 ID |
1283 | goto error_fs_info; |
1284 | } | |
1285 | ||
1286 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1287 | if (error) | |
1288 | goto error_fs_info; | |
1289 | ||
1290 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1291 | error = -EACCES; | |
6c41761f DS |
1292 | goto error_close_devices; |
1293 | } | |
1294 | ||
dfe25020 | 1295 | bdev = fs_devices->latest_bdev; |
9249e17f DH |
1296 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
1297 | fs_info); | |
830c4adb JB |
1298 | if (IS_ERR(s)) { |
1299 | error = PTR_ERR(s); | |
1300 | goto error_close_devices; | |
1301 | } | |
4b82d6e4 Y |
1302 | |
1303 | if (s->s_root) { | |
2b82032c | 1304 | btrfs_close_devices(fs_devices); |
6c41761f | 1305 | free_fs_info(fs_info); |
59553edf AV |
1306 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1307 | error = -EBUSY; | |
4b82d6e4 Y |
1308 | } else { |
1309 | char b[BDEVNAME_SIZE]; | |
1310 | ||
4b82d6e4 | 1311 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
815745cf | 1312 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1313 | error = btrfs_fill_super(s, fs_devices, data, |
1314 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 Y |
1315 | } |
1316 | ||
59553edf AV |
1317 | root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); |
1318 | if (IS_ERR(root)) | |
830c4adb | 1319 | deactivate_locked_super(s); |
4b82d6e4 | 1320 | |
061dbc6b | 1321 | return root; |
4b82d6e4 | 1322 | |
c146afad | 1323 | error_close_devices: |
8a4b83cc | 1324 | btrfs_close_devices(fs_devices); |
04d21a24 | 1325 | error_fs_info: |
6c41761f | 1326 | free_fs_info(fs_info); |
061dbc6b | 1327 | return ERR_PTR(error); |
4b82d6e4 | 1328 | } |
2e635a27 | 1329 | |
0d2450ab ST |
1330 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
1331 | int new_pool_size, int old_pool_size) | |
1332 | { | |
1333 | if (new_pool_size == old_pool_size) | |
1334 | return; | |
1335 | ||
1336 | fs_info->thread_pool_size = new_pool_size; | |
1337 | ||
efe120a0 | 1338 | btrfs_info(fs_info, "resize thread pool %d -> %d", |
0d2450ab ST |
1339 | old_pool_size, new_pool_size); |
1340 | ||
5cdc7ad3 | 1341 | btrfs_workqueue_set_max(fs_info->workers, new_pool_size); |
afe3d242 | 1342 | btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); |
a8c93d4e | 1343 | btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); |
e66f0bb1 | 1344 | btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); |
fccb5d86 QW |
1345 | btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); |
1346 | btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); | |
1347 | btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, | |
1348 | new_pool_size); | |
1349 | btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); | |
1350 | btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); | |
5b3bc44e | 1351 | btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); |
736cfa15 | 1352 | btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); |
0339ef2f QW |
1353 | btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, |
1354 | new_pool_size); | |
0d2450ab ST |
1355 | } |
1356 | ||
f42a34b2 | 1357 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
dc81cdc5 MX |
1358 | { |
1359 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
f42a34b2 | 1360 | } |
dc81cdc5 | 1361 | |
f42a34b2 MX |
1362 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
1363 | unsigned long old_opts, int flags) | |
1364 | { | |
dc81cdc5 MX |
1365 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1366 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1367 | (flags & MS_RDONLY))) { | |
1368 | /* wait for any defraggers to finish */ | |
1369 | wait_event(fs_info->transaction_wait, | |
1370 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1371 | if (flags & MS_RDONLY) | |
1372 | sync_filesystem(fs_info->sb); | |
1373 | } | |
1374 | } | |
1375 | ||
1376 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1377 | unsigned long old_opts) | |
1378 | { | |
1379 | /* | |
1380 | * We need cleanup all defragable inodes if the autodefragment is | |
1381 | * close or the fs is R/O. | |
1382 | */ | |
1383 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1384 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1385 | (fs_info->sb->s_flags & MS_RDONLY))) { | |
1386 | btrfs_cleanup_defrag_inodes(fs_info); | |
1387 | } | |
1388 | ||
1389 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1390 | } | |
1391 | ||
c146afad YZ |
1392 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1393 | { | |
815745cf AV |
1394 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1395 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1396 | unsigned old_flags = sb->s_flags; |
1397 | unsigned long old_opts = fs_info->mount_opt; | |
1398 | unsigned long old_compress_type = fs_info->compress_type; | |
1399 | u64 old_max_inline = fs_info->max_inline; | |
1400 | u64 old_alloc_start = fs_info->alloc_start; | |
1401 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1402 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
c146afad YZ |
1403 | int ret; |
1404 | ||
02b9984d | 1405 | sync_filesystem(sb); |
f42a34b2 | 1406 | btrfs_remount_prepare(fs_info); |
dc81cdc5 | 1407 | |
b288052e | 1408 | ret = btrfs_parse_options(root, data); |
49b25e05 JM |
1409 | if (ret) { |
1410 | ret = -EINVAL; | |
1411 | goto restore; | |
1412 | } | |
b288052e | 1413 | |
f42a34b2 | 1414 | btrfs_remount_begin(fs_info, old_opts, *flags); |
0d2450ab ST |
1415 | btrfs_resize_thread_pool(fs_info, |
1416 | fs_info->thread_pool_size, old_thread_pool_size); | |
1417 | ||
c146afad | 1418 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
dc81cdc5 | 1419 | goto out; |
c146afad YZ |
1420 | |
1421 | if (*flags & MS_RDONLY) { | |
8dabb742 SB |
1422 | /* |
1423 | * this also happens on 'umount -rf' or on shutdown, when | |
1424 | * the filesystem is busy. | |
1425 | */ | |
361c093d SB |
1426 | |
1427 | /* wait for the uuid_scan task to finish */ | |
1428 | down(&fs_info->uuid_tree_rescan_sem); | |
1429 | /* avoid complains from lockdep et al. */ | |
1430 | up(&fs_info->uuid_tree_rescan_sem); | |
1431 | ||
c146afad YZ |
1432 | sb->s_flags |= MS_RDONLY; |
1433 | ||
8dabb742 SB |
1434 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1435 | btrfs_scrub_cancel(fs_info); | |
061594ef | 1436 | btrfs_pause_balance(fs_info); |
8dabb742 | 1437 | |
49b25e05 JM |
1438 | ret = btrfs_commit_super(root); |
1439 | if (ret) | |
1440 | goto restore; | |
c146afad | 1441 | } else { |
6ef3de9c DS |
1442 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
1443 | btrfs_err(fs_info, | |
efe120a0 | 1444 | "Remounting read-write after error is not allowed"); |
6ef3de9c DS |
1445 | ret = -EINVAL; |
1446 | goto restore; | |
1447 | } | |
8a3db184 | 1448 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1449 | ret = -EACCES; |
1450 | goto restore; | |
8a3db184 | 1451 | } |
2b82032c | 1452 | |
292fd7fc SB |
1453 | if (fs_info->fs_devices->missing_devices > |
1454 | fs_info->num_tolerated_disk_barrier_failures && | |
1455 | !(*flags & MS_RDONLY)) { | |
efe120a0 FH |
1456 | btrfs_warn(fs_info, |
1457 | "too many missing devices, writeable remount is not allowed"); | |
292fd7fc SB |
1458 | ret = -EACCES; |
1459 | goto restore; | |
1460 | } | |
1461 | ||
8a3db184 | 1462 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1463 | ret = -EINVAL; |
1464 | goto restore; | |
8a3db184 | 1465 | } |
c146afad | 1466 | |
815745cf | 1467 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1468 | if (ret) |
1469 | goto restore; | |
c146afad | 1470 | |
d68fc57b YZ |
1471 | /* recover relocation */ |
1472 | ret = btrfs_recover_relocation(root); | |
49b25e05 JM |
1473 | if (ret) |
1474 | goto restore; | |
c146afad | 1475 | |
2b6ba629 ID |
1476 | ret = btrfs_resume_balance_async(fs_info); |
1477 | if (ret) | |
1478 | goto restore; | |
1479 | ||
8dabb742 SB |
1480 | ret = btrfs_resume_dev_replace_async(fs_info); |
1481 | if (ret) { | |
efe120a0 | 1482 | btrfs_warn(fs_info, "failed to resume dev_replace"); |
8dabb742 SB |
1483 | goto restore; |
1484 | } | |
94aebfb2 JB |
1485 | |
1486 | if (!fs_info->uuid_root) { | |
efe120a0 | 1487 | btrfs_info(fs_info, "creating UUID tree"); |
94aebfb2 JB |
1488 | ret = btrfs_create_uuid_tree(fs_info); |
1489 | if (ret) { | |
efe120a0 | 1490 | btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); |
94aebfb2 JB |
1491 | goto restore; |
1492 | } | |
1493 | } | |
c146afad YZ |
1494 | sb->s_flags &= ~MS_RDONLY; |
1495 | } | |
dc81cdc5 | 1496 | out: |
2c6a92b0 | 1497 | wake_up_process(fs_info->transaction_kthread); |
dc81cdc5 | 1498 | btrfs_remount_cleanup(fs_info, old_opts); |
c146afad | 1499 | return 0; |
49b25e05 JM |
1500 | |
1501 | restore: | |
1502 | /* We've hit an error - don't reset MS_RDONLY */ | |
1503 | if (sb->s_flags & MS_RDONLY) | |
1504 | old_flags |= MS_RDONLY; | |
1505 | sb->s_flags = old_flags; | |
1506 | fs_info->mount_opt = old_opts; | |
1507 | fs_info->compress_type = old_compress_type; | |
1508 | fs_info->max_inline = old_max_inline; | |
c018daec | 1509 | mutex_lock(&fs_info->chunk_mutex); |
49b25e05 | 1510 | fs_info->alloc_start = old_alloc_start; |
c018daec | 1511 | mutex_unlock(&fs_info->chunk_mutex); |
0d2450ab ST |
1512 | btrfs_resize_thread_pool(fs_info, |
1513 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 | 1514 | fs_info->metadata_ratio = old_metadata_ratio; |
dc81cdc5 | 1515 | btrfs_remount_cleanup(fs_info, old_opts); |
49b25e05 | 1516 | return ret; |
c146afad YZ |
1517 | } |
1518 | ||
bcd53741 AJ |
1519 | /* Used to sort the devices by max_avail(descending sort) */ |
1520 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1521 | const void *dev_info2) | |
1522 | { | |
1523 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1524 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1525 | return -1; | |
1526 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1527 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1528 | return 1; | |
1529 | else | |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | /* | |
1534 | * sort the devices by max_avail, in which max free extent size of each device | |
1535 | * is stored.(Descending Sort) | |
1536 | */ | |
1537 | static inline void btrfs_descending_sort_devices( | |
1538 | struct btrfs_device_info *devices, | |
1539 | size_t nr_devices) | |
1540 | { | |
1541 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1542 | btrfs_cmp_device_free_bytes, NULL); | |
1543 | } | |
1544 | ||
6d07bcec MX |
1545 | /* |
1546 | * The helper to calc the free space on the devices that can be used to store | |
1547 | * file data. | |
1548 | */ | |
1549 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1550 | { | |
1551 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1552 | struct btrfs_device_info *devices_info; | |
1553 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1554 | struct btrfs_device *device; | |
1555 | u64 skip_space; | |
1556 | u64 type; | |
1557 | u64 avail_space; | |
1558 | u64 used_space; | |
1559 | u64 min_stripe_size; | |
39fb26c3 | 1560 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1561 | int i = 0, nr_devices; |
1562 | int ret; | |
1563 | ||
b772a86e | 1564 | nr_devices = fs_info->fs_devices->open_devices; |
6d07bcec MX |
1565 | BUG_ON(!nr_devices); |
1566 | ||
d9b0d9ba | 1567 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
6d07bcec MX |
1568 | GFP_NOFS); |
1569 | if (!devices_info) | |
1570 | return -ENOMEM; | |
1571 | ||
1572 | /* calc min stripe number for data space alloction */ | |
1573 | type = btrfs_get_alloc_profile(root, 1); | |
39fb26c3 | 1574 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1575 | min_stripes = 2; |
39fb26c3 MX |
1576 | num_stripes = nr_devices; |
1577 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1578 | min_stripes = 2; |
39fb26c3 MX |
1579 | num_stripes = 2; |
1580 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1581 | min_stripes = 4; |
39fb26c3 MX |
1582 | num_stripes = 4; |
1583 | } | |
6d07bcec MX |
1584 | |
1585 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1586 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1587 | else | |
1588 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1589 | ||
b772a86e | 1590 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
63a212ab SB |
1591 | if (!device->in_fs_metadata || !device->bdev || |
1592 | device->is_tgtdev_for_dev_replace) | |
6d07bcec MX |
1593 | continue; |
1594 | ||
1595 | avail_space = device->total_bytes - device->bytes_used; | |
1596 | ||
1597 | /* align with stripe_len */ | |
1598 | do_div(avail_space, BTRFS_STRIPE_LEN); | |
1599 | avail_space *= BTRFS_STRIPE_LEN; | |
1600 | ||
1601 | /* | |
1602 | * In order to avoid overwritting the superblock on the drive, | |
1603 | * btrfs starts at an offset of at least 1MB when doing chunk | |
1604 | * allocation. | |
1605 | */ | |
1606 | skip_space = 1024 * 1024; | |
1607 | ||
1608 | /* user can set the offset in fs_info->alloc_start. */ | |
1609 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1610 | device->total_bytes) | |
1611 | skip_space = max(fs_info->alloc_start, skip_space); | |
1612 | ||
1613 | /* | |
1614 | * btrfs can not use the free space in [0, skip_space - 1], | |
1615 | * we must subtract it from the total. In order to implement | |
1616 | * it, we account the used space in this range first. | |
1617 | */ | |
1618 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, | |
1619 | &used_space); | |
1620 | if (ret) { | |
1621 | kfree(devices_info); | |
1622 | return ret; | |
1623 | } | |
1624 | ||
1625 | /* calc the free space in [0, skip_space - 1] */ | |
1626 | skip_space -= used_space; | |
1627 | ||
1628 | /* | |
1629 | * we can use the free space in [0, skip_space - 1], subtract | |
1630 | * it from the total. | |
1631 | */ | |
1632 | if (avail_space && avail_space >= skip_space) | |
1633 | avail_space -= skip_space; | |
1634 | else | |
1635 | avail_space = 0; | |
1636 | ||
1637 | if (avail_space < min_stripe_size) | |
1638 | continue; | |
1639 | ||
1640 | devices_info[i].dev = device; | |
1641 | devices_info[i].max_avail = avail_space; | |
1642 | ||
1643 | i++; | |
1644 | } | |
1645 | ||
1646 | nr_devices = i; | |
1647 | ||
1648 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1649 | ||
1650 | i = nr_devices - 1; | |
1651 | avail_space = 0; | |
1652 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
1653 | if (num_stripes > nr_devices) |
1654 | num_stripes = nr_devices; | |
1655 | ||
6d07bcec MX |
1656 | if (devices_info[i].max_avail >= min_stripe_size) { |
1657 | int j; | |
1658 | u64 alloc_size; | |
1659 | ||
39fb26c3 | 1660 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 1661 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 1662 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
1663 | devices_info[j].max_avail -= alloc_size; |
1664 | } | |
1665 | i--; | |
1666 | nr_devices--; | |
1667 | } | |
1668 | ||
1669 | kfree(devices_info); | |
1670 | *free_bytes = avail_space; | |
1671 | return 0; | |
1672 | } | |
1673 | ||
8fd17795 CM |
1674 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1675 | { | |
815745cf AV |
1676 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
1677 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
1678 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
1679 | struct btrfs_space_info *found; |
1680 | u64 total_used = 0; | |
6d07bcec | 1681 | u64 total_free_data = 0; |
db94535d | 1682 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 1683 | __be32 *fsid = (__be32 *)fs_info->fsid; |
6d07bcec | 1684 | int ret; |
8fd17795 | 1685 | |
6d07bcec | 1686 | /* holding chunk_muext to avoid allocating new chunks */ |
815745cf | 1687 | mutex_lock(&fs_info->chunk_mutex); |
bd4d1088 | 1688 | rcu_read_lock(); |
89a55897 | 1689 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec MX |
1690 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
1691 | total_free_data += found->disk_total - found->disk_used; | |
1692 | total_free_data -= | |
1693 | btrfs_account_ro_block_groups_free_space(found); | |
1694 | } | |
1695 | ||
b742bb82 | 1696 | total_used += found->disk_used; |
89a55897 | 1697 | } |
bd4d1088 JB |
1698 | rcu_read_unlock(); |
1699 | ||
8fd17795 | 1700 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 1701 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 | 1702 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
8fd17795 CM |
1703 | buf->f_bsize = dentry->d_sb->s_blocksize; |
1704 | buf->f_type = BTRFS_SUPER_MAGIC; | |
6d07bcec | 1705 | buf->f_bavail = total_free_data; |
815745cf | 1706 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
6d07bcec | 1707 | if (ret) { |
815745cf | 1708 | mutex_unlock(&fs_info->chunk_mutex); |
6d07bcec MX |
1709 | return ret; |
1710 | } | |
1711 | buf->f_bavail += total_free_data; | |
1712 | buf->f_bavail = buf->f_bavail >> bits; | |
815745cf | 1713 | mutex_unlock(&fs_info->chunk_mutex); |
d397712b | 1714 | |
9d03632e | 1715 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 1716 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
1717 | on a big-endian or little-endian host */ |
1718 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
1719 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
1720 | /* Mask in the root object ID too, to disambiguate subvols */ |
1721 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
1722 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
1723 | ||
8fd17795 CM |
1724 | return 0; |
1725 | } | |
b5133862 | 1726 | |
aea52e19 AV |
1727 | static void btrfs_kill_super(struct super_block *sb) |
1728 | { | |
815745cf | 1729 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 1730 | kill_anon_super(sb); |
d22ca7de | 1731 | free_fs_info(fs_info); |
aea52e19 AV |
1732 | } |
1733 | ||
2e635a27 CM |
1734 | static struct file_system_type btrfs_fs_type = { |
1735 | .owner = THIS_MODULE, | |
1736 | .name = "btrfs", | |
061dbc6b | 1737 | .mount = btrfs_mount, |
aea52e19 | 1738 | .kill_sb = btrfs_kill_super, |
2e635a27 CM |
1739 | .fs_flags = FS_REQUIRES_DEV, |
1740 | }; | |
7f78e035 | 1741 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 1742 | |
d352ac68 CM |
1743 | /* |
1744 | * used by btrfsctl to scan devices when no FS is mounted | |
1745 | */ | |
8a4b83cc CM |
1746 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
1747 | unsigned long arg) | |
1748 | { | |
1749 | struct btrfs_ioctl_vol_args *vol; | |
1750 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 1751 | int ret = -ENOTTY; |
8a4b83cc | 1752 | |
e441d54d CM |
1753 | if (!capable(CAP_SYS_ADMIN)) |
1754 | return -EPERM; | |
1755 | ||
dae7b665 LZ |
1756 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
1757 | if (IS_ERR(vol)) | |
1758 | return PTR_ERR(vol); | |
c071fcfd | 1759 | |
8a4b83cc CM |
1760 | switch (cmd) { |
1761 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 1762 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
1763 | &btrfs_fs_type, &fs_devices); |
1764 | break; | |
02db0844 JB |
1765 | case BTRFS_IOC_DEVICES_READY: |
1766 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
1767 | &btrfs_fs_type, &fs_devices); | |
1768 | if (ret) | |
1769 | break; | |
1770 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
1771 | break; | |
8a4b83cc | 1772 | } |
dae7b665 | 1773 | |
8a4b83cc | 1774 | kfree(vol); |
f819d837 | 1775 | return ret; |
8a4b83cc CM |
1776 | } |
1777 | ||
0176260f | 1778 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 1779 | { |
354aa0fb MX |
1780 | struct btrfs_trans_handle *trans; |
1781 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
1782 | ||
d4edf39b | 1783 | trans = btrfs_attach_transaction_barrier(root); |
354aa0fb MX |
1784 | if (IS_ERR(trans)) { |
1785 | /* no transaction, don't bother */ | |
1786 | if (PTR_ERR(trans) == -ENOENT) | |
1787 | return 0; | |
1788 | return PTR_ERR(trans); | |
1789 | } | |
1790 | return btrfs_commit_transaction(trans, root); | |
ed0dab6b Y |
1791 | } |
1792 | ||
0176260f | 1793 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b | 1794 | { |
0176260f | 1795 | return 0; |
ed0dab6b | 1796 | } |
2e635a27 | 1797 | |
9c5085c1 JB |
1798 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
1799 | { | |
1800 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
1801 | struct btrfs_fs_devices *cur_devices; | |
1802 | struct btrfs_device *dev, *first_dev = NULL; | |
1803 | struct list_head *head; | |
1804 | struct rcu_string *name; | |
1805 | ||
1806 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
1807 | cur_devices = fs_info->fs_devices; | |
1808 | while (cur_devices) { | |
1809 | head = &cur_devices->devices; | |
1810 | list_for_each_entry(dev, head, dev_list) { | |
aa9ddcd4 JB |
1811 | if (dev->missing) |
1812 | continue; | |
9c5085c1 JB |
1813 | if (!first_dev || dev->devid < first_dev->devid) |
1814 | first_dev = dev; | |
1815 | } | |
1816 | cur_devices = cur_devices->seed; | |
1817 | } | |
1818 | ||
1819 | if (first_dev) { | |
1820 | rcu_read_lock(); | |
1821 | name = rcu_dereference(first_dev->name); | |
1822 | seq_escape(m, name->str, " \t\n\\"); | |
1823 | rcu_read_unlock(); | |
1824 | } else { | |
1825 | WARN_ON(1); | |
1826 | } | |
1827 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
1828 | return 0; | |
1829 | } | |
1830 | ||
b87221de | 1831 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 1832 | .drop_inode = btrfs_drop_inode, |
bd555975 | 1833 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 1834 | .put_super = btrfs_put_super, |
d5719762 | 1835 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 1836 | .show_options = btrfs_show_options, |
9c5085c1 | 1837 | .show_devname = btrfs_show_devname, |
4730a4bc | 1838 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
1839 | .alloc_inode = btrfs_alloc_inode, |
1840 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 1841 | .statfs = btrfs_statfs, |
c146afad | 1842 | .remount_fs = btrfs_remount, |
0176260f LT |
1843 | .freeze_fs = btrfs_freeze, |
1844 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 1845 | }; |
a9218f6b CM |
1846 | |
1847 | static const struct file_operations btrfs_ctl_fops = { | |
1848 | .unlocked_ioctl = btrfs_control_ioctl, | |
1849 | .compat_ioctl = btrfs_control_ioctl, | |
1850 | .owner = THIS_MODULE, | |
6038f373 | 1851 | .llseek = noop_llseek, |
a9218f6b CM |
1852 | }; |
1853 | ||
1854 | static struct miscdevice btrfs_misc = { | |
578454ff | 1855 | .minor = BTRFS_MINOR, |
a9218f6b CM |
1856 | .name = "btrfs-control", |
1857 | .fops = &btrfs_ctl_fops | |
1858 | }; | |
1859 | ||
578454ff KS |
1860 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
1861 | MODULE_ALIAS("devname:btrfs-control"); | |
1862 | ||
a9218f6b CM |
1863 | static int btrfs_interface_init(void) |
1864 | { | |
1865 | return misc_register(&btrfs_misc); | |
1866 | } | |
1867 | ||
b2950863 | 1868 | static void btrfs_interface_exit(void) |
a9218f6b CM |
1869 | { |
1870 | if (misc_deregister(&btrfs_misc) < 0) | |
efe120a0 | 1871 | printk(KERN_INFO "BTRFS: misc_deregister failed for control device\n"); |
a9218f6b CM |
1872 | } |
1873 | ||
85965600 DS |
1874 | static void btrfs_print_info(void) |
1875 | { | |
1876 | printk(KERN_INFO "Btrfs loaded" | |
1877 | #ifdef CONFIG_BTRFS_DEBUG | |
1878 | ", debug=on" | |
1879 | #endif | |
79556c3d SB |
1880 | #ifdef CONFIG_BTRFS_ASSERT |
1881 | ", assert=on" | |
1882 | #endif | |
85965600 DS |
1883 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
1884 | ", integrity-checker=on" | |
1885 | #endif | |
1886 | "\n"); | |
1887 | } | |
1888 | ||
dc11dd5d JB |
1889 | static int btrfs_run_sanity_tests(void) |
1890 | { | |
06ea65a3 JB |
1891 | int ret; |
1892 | ||
294e30fe | 1893 | ret = btrfs_init_test_fs(); |
06ea65a3 JB |
1894 | if (ret) |
1895 | return ret; | |
294e30fe JB |
1896 | |
1897 | ret = btrfs_test_free_space_cache(); | |
1898 | if (ret) | |
1899 | goto out; | |
1900 | ret = btrfs_test_extent_buffer_operations(); | |
1901 | if (ret) | |
1902 | goto out; | |
1903 | ret = btrfs_test_extent_io(); | |
aaedb55b JB |
1904 | if (ret) |
1905 | goto out; | |
1906 | ret = btrfs_test_inodes(); | |
294e30fe JB |
1907 | out: |
1908 | btrfs_destroy_test_fs(); | |
1909 | return ret; | |
dc11dd5d JB |
1910 | } |
1911 | ||
2e635a27 CM |
1912 | static int __init init_btrfs_fs(void) |
1913 | { | |
2c90e5d6 | 1914 | int err; |
58176a96 | 1915 | |
14a958e6 FDBM |
1916 | err = btrfs_hash_init(); |
1917 | if (err) | |
1918 | return err; | |
1919 | ||
63541927 FDBM |
1920 | btrfs_props_init(); |
1921 | ||
58176a96 JB |
1922 | err = btrfs_init_sysfs(); |
1923 | if (err) | |
14a958e6 | 1924 | goto free_hash; |
58176a96 | 1925 | |
143bede5 | 1926 | btrfs_init_compress(); |
d1310b2e | 1927 | |
261507a0 LZ |
1928 | err = btrfs_init_cachep(); |
1929 | if (err) | |
1930 | goto free_compress; | |
1931 | ||
d1310b2e | 1932 | err = extent_io_init(); |
2f4cbe64 WB |
1933 | if (err) |
1934 | goto free_cachep; | |
1935 | ||
d1310b2e CM |
1936 | err = extent_map_init(); |
1937 | if (err) | |
1938 | goto free_extent_io; | |
1939 | ||
6352b91d | 1940 | err = ordered_data_init(); |
2f4cbe64 WB |
1941 | if (err) |
1942 | goto free_extent_map; | |
c8b97818 | 1943 | |
6352b91d MX |
1944 | err = btrfs_delayed_inode_init(); |
1945 | if (err) | |
1946 | goto free_ordered_data; | |
1947 | ||
9247f317 | 1948 | err = btrfs_auto_defrag_init(); |
16cdcec7 MX |
1949 | if (err) |
1950 | goto free_delayed_inode; | |
1951 | ||
78a6184a | 1952 | err = btrfs_delayed_ref_init(); |
9247f317 MX |
1953 | if (err) |
1954 | goto free_auto_defrag; | |
1955 | ||
b9e9a6cb WS |
1956 | err = btrfs_prelim_ref_init(); |
1957 | if (err) | |
1958 | goto free_prelim_ref; | |
1959 | ||
78a6184a MX |
1960 | err = btrfs_interface_init(); |
1961 | if (err) | |
1962 | goto free_delayed_ref; | |
1963 | ||
e565d4b9 JS |
1964 | btrfs_init_lockdep(); |
1965 | ||
85965600 | 1966 | btrfs_print_info(); |
dc11dd5d JB |
1967 | |
1968 | err = btrfs_run_sanity_tests(); | |
1969 | if (err) | |
1970 | goto unregister_ioctl; | |
1971 | ||
1972 | err = register_filesystem(&btrfs_fs_type); | |
1973 | if (err) | |
1974 | goto unregister_ioctl; | |
74255aa0 | 1975 | |
2f4cbe64 WB |
1976 | return 0; |
1977 | ||
a9218f6b CM |
1978 | unregister_ioctl: |
1979 | btrfs_interface_exit(); | |
b9e9a6cb WS |
1980 | free_prelim_ref: |
1981 | btrfs_prelim_ref_exit(); | |
78a6184a MX |
1982 | free_delayed_ref: |
1983 | btrfs_delayed_ref_exit(); | |
9247f317 MX |
1984 | free_auto_defrag: |
1985 | btrfs_auto_defrag_exit(); | |
16cdcec7 MX |
1986 | free_delayed_inode: |
1987 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
1988 | free_ordered_data: |
1989 | ordered_data_exit(); | |
2f4cbe64 WB |
1990 | free_extent_map: |
1991 | extent_map_exit(); | |
d1310b2e CM |
1992 | free_extent_io: |
1993 | extent_io_exit(); | |
2f4cbe64 WB |
1994 | free_cachep: |
1995 | btrfs_destroy_cachep(); | |
261507a0 LZ |
1996 | free_compress: |
1997 | btrfs_exit_compress(); | |
2f4cbe64 | 1998 | btrfs_exit_sysfs(); |
14a958e6 FDBM |
1999 | free_hash: |
2000 | btrfs_hash_exit(); | |
2f4cbe64 | 2001 | return err; |
2e635a27 CM |
2002 | } |
2003 | ||
2004 | static void __exit exit_btrfs_fs(void) | |
2005 | { | |
39279cc3 | 2006 | btrfs_destroy_cachep(); |
78a6184a | 2007 | btrfs_delayed_ref_exit(); |
9247f317 | 2008 | btrfs_auto_defrag_exit(); |
16cdcec7 | 2009 | btrfs_delayed_inode_exit(); |
b9e9a6cb | 2010 | btrfs_prelim_ref_exit(); |
6352b91d | 2011 | ordered_data_exit(); |
a52d9a80 | 2012 | extent_map_exit(); |
d1310b2e | 2013 | extent_io_exit(); |
a9218f6b | 2014 | btrfs_interface_exit(); |
2e635a27 | 2015 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 2016 | btrfs_exit_sysfs(); |
8a4b83cc | 2017 | btrfs_cleanup_fs_uuids(); |
261507a0 | 2018 | btrfs_exit_compress(); |
14a958e6 | 2019 | btrfs_hash_exit(); |
2e635a27 CM |
2020 | } |
2021 | ||
60efa5eb | 2022 | late_initcall(init_btrfs_fs); |
2e635a27 CM |
2023 | module_exit(exit_btrfs_fs) |
2024 | ||
2025 | MODULE_LICENSE("GPL"); |