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 | |
d3982100 | 63 | #include "qgroup.h" |
1abe9b8a | 64 | #define CREATE_TRACE_POINTS |
65 | #include <trace/events/btrfs.h> | |
66 | ||
b87221de | 67 | static const struct super_operations btrfs_super_ops; |
830c4adb | 68 | static struct file_system_type btrfs_fs_type; |
75dfe396 | 69 | |
0723a047 HH |
70 | static int btrfs_remount(struct super_block *sb, int *flags, char *data); |
71 | ||
e33e17ee | 72 | const char *btrfs_decode_error(int errno) |
acce952b | 73 | { |
08748810 | 74 | char *errstr = "unknown"; |
acce952b | 75 | |
76 | switch (errno) { | |
77 | case -EIO: | |
78 | errstr = "IO failure"; | |
79 | break; | |
80 | case -ENOMEM: | |
81 | errstr = "Out of memory"; | |
82 | break; | |
83 | case -EROFS: | |
84 | errstr = "Readonly filesystem"; | |
85 | break; | |
8c342930 JM |
86 | case -EEXIST: |
87 | errstr = "Object already exists"; | |
88 | break; | |
94ef7280 DS |
89 | case -ENOSPC: |
90 | errstr = "No space left"; | |
91 | break; | |
92 | case -ENOENT: | |
93 | errstr = "No such entry"; | |
94 | break; | |
acce952b | 95 | } |
96 | ||
97 | return errstr; | |
98 | } | |
99 | ||
bbece8a3 | 100 | static void save_error_info(struct btrfs_fs_info *fs_info) |
acce952b | 101 | { |
102 | /* | |
103 | * today we only save the error info into ram. Long term we'll | |
104 | * also send it down to the disk | |
105 | */ | |
87533c47 | 106 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); |
acce952b | 107 | } |
108 | ||
acce952b | 109 | /* btrfs handle error by forcing the filesystem readonly */ |
110 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) | |
111 | { | |
112 | struct super_block *sb = fs_info->sb; | |
113 | ||
114 | if (sb->s_flags & MS_RDONLY) | |
115 | return; | |
116 | ||
87533c47 | 117 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
acce952b | 118 | sb->s_flags |= MS_RDONLY; |
c2cf52eb | 119 | btrfs_info(fs_info, "forced readonly"); |
1acd6831 SB |
120 | /* |
121 | * Note that a running device replace operation is not | |
122 | * canceled here although there is no way to update | |
123 | * the progress. It would add the risk of a deadlock, | |
124 | * therefore the canceling is ommited. The only penalty | |
125 | * is that some I/O remains active until the procedure | |
126 | * completes. The next time when the filesystem is | |
127 | * mounted writeable again, the device replace | |
128 | * operation continues. | |
129 | */ | |
acce952b | 130 | } |
131 | } | |
132 | ||
133 | /* | |
134 | * __btrfs_std_error decodes expected errors from the caller and | |
135 | * invokes the approciate error response. | |
136 | */ | |
c0d19e2b | 137 | __cold |
acce952b | 138 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, |
4da35113 | 139 | unsigned int line, int errno, const char *fmt, ...) |
acce952b | 140 | { |
141 | struct super_block *sb = fs_info->sb; | |
57d816a1 | 142 | #ifdef CONFIG_PRINTK |
acce952b | 143 | const char *errstr; |
57d816a1 | 144 | #endif |
acce952b | 145 | |
146 | /* | |
147 | * Special case: if the error is EROFS, and we're already | |
148 | * under MS_RDONLY, then it is safe here. | |
149 | */ | |
150 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
4da35113 JM |
151 | return; |
152 | ||
57d816a1 | 153 | #ifdef CONFIG_PRINTK |
08748810 | 154 | errstr = btrfs_decode_error(errno); |
4da35113 | 155 | if (fmt) { |
37252a66 ES |
156 | struct va_format vaf; |
157 | va_list args; | |
158 | ||
159 | va_start(args, fmt); | |
160 | vaf.fmt = fmt; | |
161 | vaf.va = &args; | |
4da35113 | 162 | |
efe120a0 FH |
163 | printk(KERN_CRIT |
164 | "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", | |
08748810 | 165 | sb->s_id, function, line, errno, errstr, &vaf); |
37252a66 | 166 | va_end(args); |
4da35113 | 167 | } else { |
efe120a0 | 168 | printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", |
08748810 | 169 | sb->s_id, function, line, errno, errstr); |
4da35113 | 170 | } |
57d816a1 | 171 | #endif |
acce952b | 172 | |
4da35113 | 173 | /* Don't go through full error handling during mount */ |
cf79ffb5 JB |
174 | save_error_info(fs_info); |
175 | if (sb->s_flags & MS_BORN) | |
4da35113 | 176 | btrfs_handle_error(fs_info); |
4da35113 | 177 | } |
acce952b | 178 | |
57d816a1 | 179 | #ifdef CONFIG_PRINTK |
533574c6 | 180 | static const char * const logtypes[] = { |
4da35113 JM |
181 | "emergency", |
182 | "alert", | |
183 | "critical", | |
184 | "error", | |
185 | "warning", | |
186 | "notice", | |
187 | "info", | |
188 | "debug", | |
189 | }; | |
190 | ||
c2cf52eb | 191 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
4da35113 JM |
192 | { |
193 | struct super_block *sb = fs_info->sb; | |
194 | char lvl[4]; | |
195 | struct va_format vaf; | |
196 | va_list args; | |
197 | const char *type = logtypes[4]; | |
533574c6 | 198 | int kern_level; |
4da35113 JM |
199 | |
200 | va_start(args, fmt); | |
201 | ||
533574c6 JP |
202 | kern_level = printk_get_level(fmt); |
203 | if (kern_level) { | |
204 | size_t size = printk_skip_level(fmt) - fmt; | |
205 | memcpy(lvl, fmt, size); | |
206 | lvl[size] = '\0'; | |
207 | fmt += size; | |
208 | type = logtypes[kern_level - '0']; | |
4da35113 JM |
209 | } else |
210 | *lvl = '\0'; | |
211 | ||
212 | vaf.fmt = fmt; | |
213 | vaf.va = &args; | |
533574c6 | 214 | |
c2cf52eb | 215 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); |
533574c6 JP |
216 | |
217 | va_end(args); | |
218 | } | |
533574c6 | 219 | #endif |
acce952b | 220 | |
49b25e05 JM |
221 | /* |
222 | * We only mark the transaction aborted and then set the file system read-only. | |
223 | * This will prevent new transactions from starting or trying to join this | |
224 | * one. | |
225 | * | |
226 | * This means that error recovery at the call site is limited to freeing | |
227 | * any local memory allocations and passing the error code up without | |
228 | * further cleanup. The transaction should complete as it normally would | |
229 | * in the call path but will return -EIO. | |
230 | * | |
231 | * We'll complete the cleanup in btrfs_end_transaction and | |
232 | * btrfs_commit_transaction. | |
233 | */ | |
c0d19e2b | 234 | __cold |
49b25e05 JM |
235 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, |
236 | struct btrfs_root *root, const char *function, | |
237 | unsigned int line, int errno) | |
238 | { | |
49b25e05 JM |
239 | trans->aborted = errno; |
240 | /* Nothing used. The other threads that have joined this | |
241 | * transaction may be able to continue. */ | |
c92f6be3 | 242 | if (!trans->blocks_used && list_empty(&trans->new_bgs)) { |
69ce977a MX |
243 | const char *errstr; |
244 | ||
08748810 | 245 | errstr = btrfs_decode_error(errno); |
c2cf52eb SK |
246 | btrfs_warn(root->fs_info, |
247 | "%s:%d: Aborting unused transaction(%s).", | |
248 | function, line, errstr); | |
acce952b | 249 | return; |
49b25e05 | 250 | } |
8d25a086 | 251 | ACCESS_ONCE(trans->transaction->aborted) = errno; |
501407aa JB |
252 | /* Wake up anybody who may be waiting on this transaction */ |
253 | wake_up(&root->fs_info->transaction_wait); | |
254 | wake_up(&root->fs_info->transaction_blocked_wait); | |
49b25e05 JM |
255 | __btrfs_std_error(root->fs_info, function, line, errno, NULL); |
256 | } | |
8c342930 JM |
257 | /* |
258 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
259 | * issues an alert, and either panics or BUGs, depending on mount options. | |
260 | */ | |
c0d19e2b | 261 | __cold |
8c342930 JM |
262 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, |
263 | unsigned int line, int errno, const char *fmt, ...) | |
264 | { | |
8c342930 JM |
265 | char *s_id = "<unknown>"; |
266 | const char *errstr; | |
267 | struct va_format vaf = { .fmt = fmt }; | |
268 | va_list args; | |
acce952b | 269 | |
8c342930 JM |
270 | if (fs_info) |
271 | s_id = fs_info->sb->s_id; | |
acce952b | 272 | |
8c342930 JM |
273 | va_start(args, fmt); |
274 | vaf.va = &args; | |
275 | ||
08748810 | 276 | errstr = btrfs_decode_error(errno); |
aa43a17c | 277 | if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) |
08748810 DS |
278 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
279 | s_id, function, line, &vaf, errno, errstr); | |
8c342930 | 280 | |
efe120a0 FH |
281 | btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", |
282 | function, line, &vaf, errno, errstr); | |
8c342930 JM |
283 | va_end(args); |
284 | /* Caller calls BUG() */ | |
acce952b | 285 | } |
286 | ||
d397712b | 287 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 288 | { |
3abdbd78 | 289 | close_ctree(btrfs_sb(sb)->tree_root); |
75dfe396 CM |
290 | } |
291 | ||
95e05289 | 292 | enum { |
73f73415 | 293 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
294 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
295 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
261507a0 LZ |
296 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
297 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
70f6d82e OS |
298 | Opt_space_cache, Opt_space_cache_version, Opt_clear_cache, |
299 | Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid, | |
300 | Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery, | |
301 | Opt_skip_balance, Opt_check_integrity, | |
302 | Opt_check_integrity_including_extent_data, | |
f420ee1e | 303 | Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, |
e07a2ade | 304 | Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, |
a258af7a | 305 | Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, |
3818aea2 | 306 | Opt_datasum, Opt_treelog, Opt_noinode_cache, |
d0bd4560 JB |
307 | #ifdef CONFIG_BTRFS_DEBUG |
308 | Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, | |
309 | #endif | |
9555c6c1 | 310 | Opt_err, |
95e05289 CM |
311 | }; |
312 | ||
4d4ab6d6 | 313 | static const match_table_t tokens = { |
dfe25020 | 314 | {Opt_degraded, "degraded"}, |
95e05289 | 315 | {Opt_subvol, "subvol=%s"}, |
1493381f | 316 | {Opt_subvolid, "subvolid=%s"}, |
43e570b0 | 317 | {Opt_device, "device=%s"}, |
b6cda9bc | 318 | {Opt_nodatasum, "nodatasum"}, |
d399167d | 319 | {Opt_datasum, "datasum"}, |
be20aa9d | 320 | {Opt_nodatacow, "nodatacow"}, |
a258af7a | 321 | {Opt_datacow, "datacow"}, |
21ad10cf | 322 | {Opt_nobarrier, "nobarrier"}, |
842bef58 | 323 | {Opt_barrier, "barrier"}, |
6f568d35 | 324 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 325 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 326 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 327 | {Opt_compress, "compress"}, |
261507a0 | 328 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 329 | {Opt_compress_force, "compress-force"}, |
261507a0 | 330 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 331 | {Opt_ssd, "ssd"}, |
451d7585 | 332 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 333 | {Opt_nossd, "nossd"}, |
bd0330ad | 334 | {Opt_acl, "acl"}, |
33268eaf | 335 | {Opt_noacl, "noacl"}, |
3a5e1404 | 336 | {Opt_notreelog, "notreelog"}, |
a88998f2 | 337 | {Opt_treelog, "treelog"}, |
dccae999 | 338 | {Opt_flushoncommit, "flushoncommit"}, |
2c9ee856 | 339 | {Opt_noflushoncommit, "noflushoncommit"}, |
97e728d4 | 340 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 341 | {Opt_discard, "discard"}, |
e07a2ade | 342 | {Opt_nodiscard, "nodiscard"}, |
0af3d00b | 343 | {Opt_space_cache, "space_cache"}, |
70f6d82e | 344 | {Opt_space_cache_version, "space_cache=%s"}, |
88c2ba3b | 345 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 346 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 347 | {Opt_enospc_debug, "enospc_debug"}, |
53036293 | 348 | {Opt_noenospc_debug, "noenospc_debug"}, |
e15d0542 | 349 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 350 | {Opt_defrag, "autodefrag"}, |
fc0ca9af | 351 | {Opt_nodefrag, "noautodefrag"}, |
4b9465cb | 352 | {Opt_inode_cache, "inode_cache"}, |
3818aea2 | 353 | {Opt_noinode_cache, "noinode_cache"}, |
8965593e | 354 | {Opt_no_space_cache, "nospace_cache"}, |
af31f5e5 | 355 | {Opt_recovery, "recovery"}, |
9555c6c1 | 356 | {Opt_skip_balance, "skip_balance"}, |
21adbd5c SB |
357 | {Opt_check_integrity, "check_int"}, |
358 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
359 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, | |
f420ee1e | 360 | {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, |
8c342930 | 361 | {Opt_fatal_errors, "fatal_errors=%s"}, |
8b87dc17 | 362 | {Opt_commit_interval, "commit=%d"}, |
d0bd4560 JB |
363 | #ifdef CONFIG_BTRFS_DEBUG |
364 | {Opt_fragment_data, "fragment=data"}, | |
365 | {Opt_fragment_metadata, "fragment=metadata"}, | |
366 | {Opt_fragment_all, "fragment=all"}, | |
367 | #endif | |
33268eaf | 368 | {Opt_err, NULL}, |
95e05289 CM |
369 | }; |
370 | ||
edf24abe CH |
371 | /* |
372 | * Regular mount options parser. Everything that is needed only when | |
373 | * reading in a new superblock is parsed here. | |
49b25e05 | 374 | * XXX JDM: This needs to be cleaned up for remount. |
edf24abe CH |
375 | */ |
376 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 377 | { |
edf24abe | 378 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 379 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
380 | char *p, *num, *orig = NULL; |
381 | u64 cache_gen; | |
4543df7e | 382 | int intarg; |
a7a3f7ca | 383 | int ret = 0; |
261507a0 LZ |
384 | char *compress_type; |
385 | bool compress_force = false; | |
b7c47bbb TI |
386 | enum btrfs_compression_type saved_compress_type; |
387 | bool saved_compress_force; | |
388 | int no_compress = 0; | |
b6cda9bc | 389 | |
6c41761f | 390 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
70f6d82e OS |
391 | if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE)) |
392 | btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); | |
393 | else if (cache_gen) | |
73bc1876 JB |
394 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
395 | ||
95e05289 | 396 | if (!options) |
73bc1876 | 397 | goto out; |
95e05289 | 398 | |
be20aa9d CM |
399 | /* |
400 | * strsep changes the string, duplicate it because parse_options | |
401 | * gets called twice | |
402 | */ | |
403 | options = kstrdup(options, GFP_NOFS); | |
404 | if (!options) | |
405 | return -ENOMEM; | |
406 | ||
da495ecc | 407 | orig = options; |
be20aa9d | 408 | |
edf24abe | 409 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
410 | int token; |
411 | if (!*p) | |
412 | continue; | |
413 | ||
414 | token = match_token(p, tokens, args); | |
415 | switch (token) { | |
dfe25020 | 416 | case Opt_degraded: |
efe120a0 | 417 | btrfs_info(root->fs_info, "allowing degraded mounts"); |
edf24abe | 418 | btrfs_set_opt(info->mount_opt, DEGRADED); |
dfe25020 | 419 | break; |
95e05289 | 420 | case Opt_subvol: |
73f73415 | 421 | case Opt_subvolid: |
e15d0542 | 422 | case Opt_subvolrootid: |
43e570b0 | 423 | case Opt_device: |
edf24abe | 424 | /* |
43e570b0 | 425 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
426 | * and can be happily ignored here. |
427 | */ | |
b6cda9bc CM |
428 | break; |
429 | case Opt_nodatasum: | |
07802534 QW |
430 | btrfs_set_and_info(root, NODATASUM, |
431 | "setting nodatasum"); | |
be20aa9d | 432 | break; |
d399167d | 433 | case Opt_datasum: |
07802534 QW |
434 | if (btrfs_test_opt(root, NODATASUM)) { |
435 | if (btrfs_test_opt(root, NODATACOW)) | |
436 | btrfs_info(root->fs_info, "setting datasum, datacow enabled"); | |
437 | else | |
438 | btrfs_info(root->fs_info, "setting datasum"); | |
439 | } | |
d399167d QW |
440 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
441 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
442 | break; | |
be20aa9d | 443 | case Opt_nodatacow: |
07802534 QW |
444 | if (!btrfs_test_opt(root, NODATACOW)) { |
445 | if (!btrfs_test_opt(root, COMPRESS) || | |
446 | !btrfs_test_opt(root, FORCE_COMPRESS)) { | |
efe120a0 | 447 | btrfs_info(root->fs_info, |
07802534 QW |
448 | "setting nodatacow, compression disabled"); |
449 | } else { | |
450 | btrfs_info(root->fs_info, "setting nodatacow"); | |
451 | } | |
bedb2cca | 452 | } |
bedb2cca AP |
453 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
454 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
edf24abe CH |
455 | btrfs_set_opt(info->mount_opt, NODATACOW); |
456 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 457 | break; |
a258af7a | 458 | case Opt_datacow: |
07802534 QW |
459 | btrfs_clear_and_info(root, NODATACOW, |
460 | "setting datacow"); | |
a258af7a | 461 | break; |
a555f810 | 462 | case Opt_compress_force: |
261507a0 LZ |
463 | case Opt_compress_force_type: |
464 | compress_force = true; | |
1c697d4a | 465 | /* Fallthrough */ |
261507a0 LZ |
466 | case Opt_compress: |
467 | case Opt_compress_type: | |
b7c47bbb TI |
468 | saved_compress_type = btrfs_test_opt(root, COMPRESS) ? |
469 | info->compress_type : BTRFS_COMPRESS_NONE; | |
470 | saved_compress_force = | |
471 | btrfs_test_opt(root, FORCE_COMPRESS); | |
261507a0 LZ |
472 | if (token == Opt_compress || |
473 | token == Opt_compress_force || | |
474 | strcmp(args[0].from, "zlib") == 0) { | |
475 | compress_type = "zlib"; | |
476 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
063849ea | 477 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
478 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
479 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
b7c47bbb | 480 | no_compress = 0; |
a6fa6fae LZ |
481 | } else if (strcmp(args[0].from, "lzo") == 0) { |
482 | compress_type = "lzo"; | |
483 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 484 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
485 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
486 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
2b0ce2c2 | 487 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
b7c47bbb | 488 | no_compress = 0; |
063849ea AH |
489 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
490 | compress_type = "no"; | |
063849ea AH |
491 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
492 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
493 | compress_force = false; | |
b7c47bbb | 494 | no_compress++; |
261507a0 LZ |
495 | } else { |
496 | ret = -EINVAL; | |
497 | goto out; | |
498 | } | |
499 | ||
261507a0 | 500 | if (compress_force) { |
b7c47bbb | 501 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); |
143f3636 | 502 | } else { |
4027e0f4 WS |
503 | /* |
504 | * If we remount from compress-force=xxx to | |
505 | * compress=xxx, we need clear FORCE_COMPRESS | |
506 | * flag, otherwise, there is no way for users | |
507 | * to disable forcible compression separately. | |
508 | */ | |
509 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
a7e252af | 510 | } |
b7c47bbb TI |
511 | if ((btrfs_test_opt(root, COMPRESS) && |
512 | (info->compress_type != saved_compress_type || | |
513 | compress_force != saved_compress_force)) || | |
514 | (!btrfs_test_opt(root, COMPRESS) && | |
515 | no_compress == 1)) { | |
516 | btrfs_info(root->fs_info, | |
517 | "%s %s compression", | |
518 | (compress_force) ? "force" : "use", | |
519 | compress_type); | |
520 | } | |
521 | compress_force = false; | |
a555f810 | 522 | break; |
e18e4809 | 523 | case Opt_ssd: |
07802534 QW |
524 | btrfs_set_and_info(root, SSD, |
525 | "use ssd allocation scheme"); | |
e18e4809 | 526 | break; |
451d7585 | 527 | case Opt_ssd_spread: |
07802534 QW |
528 | btrfs_set_and_info(root, SSD_SPREAD, |
529 | "use spread ssd allocation scheme"); | |
2aa06a35 | 530 | btrfs_set_opt(info->mount_opt, SSD); |
451d7585 | 531 | break; |
3b30c22f | 532 | case Opt_nossd: |
2aa06a35 | 533 | btrfs_set_and_info(root, NOSSD, |
07802534 | 534 | "not using ssd allocation scheme"); |
3b30c22f CM |
535 | btrfs_clear_opt(info->mount_opt, SSD); |
536 | break; | |
842bef58 | 537 | case Opt_barrier: |
07802534 QW |
538 | btrfs_clear_and_info(root, NOBARRIER, |
539 | "turning on barriers"); | |
842bef58 | 540 | break; |
21ad10cf | 541 | case Opt_nobarrier: |
07802534 QW |
542 | btrfs_set_and_info(root, NOBARRIER, |
543 | "turning off barriers"); | |
21ad10cf | 544 | break; |
4543df7e | 545 | case Opt_thread_pool: |
2c334e87 WS |
546 | ret = match_int(&args[0], &intarg); |
547 | if (ret) { | |
548 | goto out; | |
549 | } else if (intarg > 0) { | |
4543df7e | 550 | info->thread_pool_size = intarg; |
2c334e87 WS |
551 | } else { |
552 | ret = -EINVAL; | |
553 | goto out; | |
554 | } | |
4543df7e | 555 | break; |
6f568d35 | 556 | case Opt_max_inline: |
edf24abe CH |
557 | num = match_strdup(&args[0]); |
558 | if (num) { | |
91748467 | 559 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
560 | kfree(num); |
561 | ||
15ada040 | 562 | if (info->max_inline) { |
feb5f965 | 563 | info->max_inline = min_t(u64, |
15ada040 CM |
564 | info->max_inline, |
565 | root->sectorsize); | |
566 | } | |
efe120a0 | 567 | btrfs_info(root->fs_info, "max_inline at %llu", |
c1c9ff7c | 568 | info->max_inline); |
2c334e87 WS |
569 | } else { |
570 | ret = -ENOMEM; | |
571 | goto out; | |
6f568d35 CM |
572 | } |
573 | break; | |
8f662a76 | 574 | case Opt_alloc_start: |
edf24abe CH |
575 | num = match_strdup(&args[0]); |
576 | if (num) { | |
c018daec | 577 | mutex_lock(&info->chunk_mutex); |
91748467 | 578 | info->alloc_start = memparse(num, NULL); |
c018daec | 579 | mutex_unlock(&info->chunk_mutex); |
edf24abe | 580 | kfree(num); |
efe120a0 | 581 | btrfs_info(root->fs_info, "allocations start at %llu", |
c1c9ff7c | 582 | info->alloc_start); |
2c334e87 WS |
583 | } else { |
584 | ret = -ENOMEM; | |
585 | goto out; | |
8f662a76 CM |
586 | } |
587 | break; | |
bd0330ad | 588 | case Opt_acl: |
45ff35d6 | 589 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
bd0330ad QW |
590 | root->fs_info->sb->s_flags |= MS_POSIXACL; |
591 | break; | |
45ff35d6 GZ |
592 | #else |
593 | btrfs_err(root->fs_info, | |
594 | "support for ACL not compiled in!"); | |
595 | ret = -EINVAL; | |
596 | goto out; | |
597 | #endif | |
33268eaf JB |
598 | case Opt_noacl: |
599 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
600 | break; | |
3a5e1404 | 601 | case Opt_notreelog: |
07802534 QW |
602 | btrfs_set_and_info(root, NOTREELOG, |
603 | "disabling tree log"); | |
a88998f2 QW |
604 | break; |
605 | case Opt_treelog: | |
07802534 QW |
606 | btrfs_clear_and_info(root, NOTREELOG, |
607 | "enabling tree log"); | |
3a5e1404 | 608 | break; |
dccae999 | 609 | case Opt_flushoncommit: |
07802534 QW |
610 | btrfs_set_and_info(root, FLUSHONCOMMIT, |
611 | "turning on flush-on-commit"); | |
dccae999 | 612 | break; |
2c9ee856 | 613 | case Opt_noflushoncommit: |
07802534 QW |
614 | btrfs_clear_and_info(root, FLUSHONCOMMIT, |
615 | "turning off flush-on-commit"); | |
2c9ee856 | 616 | break; |
97e728d4 | 617 | case Opt_ratio: |
2c334e87 WS |
618 | ret = match_int(&args[0], &intarg); |
619 | if (ret) { | |
620 | goto out; | |
621 | } else if (intarg >= 0) { | |
97e728d4 | 622 | info->metadata_ratio = intarg; |
efe120a0 | 623 | btrfs_info(root->fs_info, "metadata ratio %d", |
97e728d4 | 624 | info->metadata_ratio); |
2c334e87 WS |
625 | } else { |
626 | ret = -EINVAL; | |
627 | goto out; | |
97e728d4 JB |
628 | } |
629 | break; | |
e244a0ae | 630 | case Opt_discard: |
07802534 QW |
631 | btrfs_set_and_info(root, DISCARD, |
632 | "turning on discard"); | |
e244a0ae | 633 | break; |
e07a2ade | 634 | case Opt_nodiscard: |
07802534 QW |
635 | btrfs_clear_and_info(root, DISCARD, |
636 | "turning off discard"); | |
e07a2ade | 637 | break; |
0af3d00b | 638 | case Opt_space_cache: |
70f6d82e OS |
639 | case Opt_space_cache_version: |
640 | if (token == Opt_space_cache || | |
641 | strcmp(args[0].from, "v1") == 0) { | |
642 | btrfs_clear_opt(root->fs_info->mount_opt, | |
643 | FREE_SPACE_TREE); | |
644 | btrfs_set_and_info(root, SPACE_CACHE, | |
645 | "enabling disk space caching"); | |
646 | } else if (strcmp(args[0].from, "v2") == 0) { | |
647 | btrfs_clear_opt(root->fs_info->mount_opt, | |
648 | SPACE_CACHE); | |
649 | btrfs_set_and_info(root, FREE_SPACE_TREE, | |
650 | "enabling free space tree"); | |
651 | } else { | |
652 | ret = -EINVAL; | |
653 | goto out; | |
654 | } | |
0de90876 | 655 | break; |
f420ee1e SB |
656 | case Opt_rescan_uuid_tree: |
657 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); | |
658 | break; | |
73bc1876 | 659 | case Opt_no_space_cache: |
70f6d82e OS |
660 | if (btrfs_test_opt(root, SPACE_CACHE)) { |
661 | btrfs_clear_and_info(root, SPACE_CACHE, | |
662 | "disabling disk space caching"); | |
663 | } | |
664 | if (btrfs_test_opt(root, FREE_SPACE_TREE)) { | |
665 | btrfs_clear_and_info(root, FREE_SPACE_TREE, | |
666 | "disabling free space tree"); | |
667 | } | |
73bc1876 | 668 | break; |
4b9465cb | 669 | case Opt_inode_cache: |
7e1876ac | 670 | btrfs_set_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 671 | "enabling inode map caching"); |
3818aea2 QW |
672 | break; |
673 | case Opt_noinode_cache: | |
7e1876ac | 674 | btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 675 | "disabling inode map caching"); |
4b9465cb | 676 | break; |
88c2ba3b | 677 | case Opt_clear_cache: |
07802534 QW |
678 | btrfs_set_and_info(root, CLEAR_CACHE, |
679 | "force clearing of disk cache"); | |
0af3d00b | 680 | break; |
4260f7c7 SW |
681 | case Opt_user_subvol_rm_allowed: |
682 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
683 | break; | |
91435650 CM |
684 | case Opt_enospc_debug: |
685 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
686 | break; | |
53036293 QW |
687 | case Opt_noenospc_debug: |
688 | btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); | |
689 | break; | |
4cb5300b | 690 | case Opt_defrag: |
07802534 QW |
691 | btrfs_set_and_info(root, AUTO_DEFRAG, |
692 | "enabling auto defrag"); | |
4cb5300b | 693 | break; |
fc0ca9af | 694 | case Opt_nodefrag: |
07802534 QW |
695 | btrfs_clear_and_info(root, AUTO_DEFRAG, |
696 | "disabling auto defrag"); | |
fc0ca9af | 697 | break; |
af31f5e5 | 698 | case Opt_recovery: |
efe120a0 | 699 | btrfs_info(root->fs_info, "enabling auto recovery"); |
af31f5e5 CM |
700 | btrfs_set_opt(info->mount_opt, RECOVERY); |
701 | break; | |
9555c6c1 ID |
702 | case Opt_skip_balance: |
703 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
704 | break; | |
21adbd5c SB |
705 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
706 | case Opt_check_integrity_including_extent_data: | |
efe120a0 FH |
707 | btrfs_info(root->fs_info, |
708 | "enabling check integrity including extent data"); | |
21adbd5c SB |
709 | btrfs_set_opt(info->mount_opt, |
710 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
711 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
712 | break; | |
713 | case Opt_check_integrity: | |
efe120a0 | 714 | btrfs_info(root->fs_info, "enabling check integrity"); |
21adbd5c SB |
715 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
716 | break; | |
717 | case Opt_check_integrity_print_mask: | |
2c334e87 WS |
718 | ret = match_int(&args[0], &intarg); |
719 | if (ret) { | |
720 | goto out; | |
721 | } else if (intarg >= 0) { | |
21adbd5c | 722 | info->check_integrity_print_mask = intarg; |
efe120a0 | 723 | btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", |
21adbd5c | 724 | info->check_integrity_print_mask); |
2c334e87 WS |
725 | } else { |
726 | ret = -EINVAL; | |
727 | goto out; | |
21adbd5c SB |
728 | } |
729 | break; | |
730 | #else | |
731 | case Opt_check_integrity_including_extent_data: | |
732 | case Opt_check_integrity: | |
733 | case Opt_check_integrity_print_mask: | |
efe120a0 FH |
734 | btrfs_err(root->fs_info, |
735 | "support for check_integrity* not compiled in!"); | |
21adbd5c SB |
736 | ret = -EINVAL; |
737 | goto out; | |
738 | #endif | |
8c342930 JM |
739 | case Opt_fatal_errors: |
740 | if (strcmp(args[0].from, "panic") == 0) | |
741 | btrfs_set_opt(info->mount_opt, | |
742 | PANIC_ON_FATAL_ERROR); | |
743 | else if (strcmp(args[0].from, "bug") == 0) | |
744 | btrfs_clear_opt(info->mount_opt, | |
745 | PANIC_ON_FATAL_ERROR); | |
746 | else { | |
747 | ret = -EINVAL; | |
748 | goto out; | |
749 | } | |
750 | break; | |
8b87dc17 DS |
751 | case Opt_commit_interval: |
752 | intarg = 0; | |
753 | ret = match_int(&args[0], &intarg); | |
754 | if (ret < 0) { | |
efe120a0 | 755 | btrfs_err(root->fs_info, "invalid commit interval"); |
8b87dc17 DS |
756 | ret = -EINVAL; |
757 | goto out; | |
758 | } | |
759 | if (intarg > 0) { | |
760 | if (intarg > 300) { | |
efe120a0 | 761 | btrfs_warn(root->fs_info, "excessive commit interval %d", |
8b87dc17 DS |
762 | intarg); |
763 | } | |
764 | info->commit_interval = intarg; | |
765 | } else { | |
efe120a0 | 766 | btrfs_info(root->fs_info, "using default commit interval %ds", |
8b87dc17 DS |
767 | BTRFS_DEFAULT_COMMIT_INTERVAL); |
768 | info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; | |
769 | } | |
770 | break; | |
d0bd4560 JB |
771 | #ifdef CONFIG_BTRFS_DEBUG |
772 | case Opt_fragment_all: | |
773 | btrfs_info(root->fs_info, "fragmenting all space"); | |
774 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); | |
775 | btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); | |
776 | break; | |
777 | case Opt_fragment_metadata: | |
778 | btrfs_info(root->fs_info, "fragmenting metadata"); | |
779 | btrfs_set_opt(info->mount_opt, | |
780 | FRAGMENT_METADATA); | |
781 | break; | |
782 | case Opt_fragment_data: | |
783 | btrfs_info(root->fs_info, "fragmenting data"); | |
784 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); | |
785 | break; | |
786 | #endif | |
a7a3f7ca | 787 | case Opt_err: |
efe120a0 | 788 | btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); |
a7a3f7ca SW |
789 | ret = -EINVAL; |
790 | goto out; | |
95e05289 | 791 | default: |
be20aa9d | 792 | break; |
95e05289 CM |
793 | } |
794 | } | |
a7a3f7ca | 795 | out: |
70f6d82e OS |
796 | if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) && |
797 | !btrfs_test_opt(root, FREE_SPACE_TREE) && | |
798 | !btrfs_test_opt(root, CLEAR_CACHE)) { | |
799 | btrfs_err(root->fs_info, "cannot disable free space tree"); | |
800 | ret = -EINVAL; | |
801 | ||
802 | } | |
73bc1876 | 803 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
efe120a0 | 804 | btrfs_info(root->fs_info, "disk space caching is enabled"); |
70f6d82e OS |
805 | if (!ret && btrfs_test_opt(root, FREE_SPACE_TREE)) |
806 | btrfs_info(root->fs_info, "using free space tree"); | |
da495ecc | 807 | kfree(orig); |
a7a3f7ca | 808 | return ret; |
edf24abe CH |
809 | } |
810 | ||
811 | /* | |
812 | * Parse mount options that are required early in the mount process. | |
813 | * | |
814 | * All other options will be parsed on much later in the mount process and | |
815 | * only when we need to allocate a new super block. | |
816 | */ | |
97288f2c | 817 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 818 | void *holder, char **subvol_name, u64 *subvol_objectid, |
5e2a4b25 | 819 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
820 | { |
821 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 822 | char *device_name, *opts, *orig, *p; |
1493381f | 823 | char *num = NULL; |
edf24abe CH |
824 | int error = 0; |
825 | ||
826 | if (!options) | |
830c4adb | 827 | return 0; |
edf24abe CH |
828 | |
829 | /* | |
830 | * strsep changes the string, duplicate it because parse_options | |
831 | * gets called twice | |
832 | */ | |
833 | opts = kstrdup(options, GFP_KERNEL); | |
834 | if (!opts) | |
835 | return -ENOMEM; | |
3f3d0bc0 | 836 | orig = opts; |
edf24abe CH |
837 | |
838 | while ((p = strsep(&opts, ",")) != NULL) { | |
839 | int token; | |
840 | if (!*p) | |
841 | continue; | |
842 | ||
843 | token = match_token(p, tokens, args); | |
844 | switch (token) { | |
845 | case Opt_subvol: | |
a90e8b6f | 846 | kfree(*subvol_name); |
edf24abe | 847 | *subvol_name = match_strdup(&args[0]); |
2c334e87 WS |
848 | if (!*subvol_name) { |
849 | error = -ENOMEM; | |
850 | goto out; | |
851 | } | |
edf24abe | 852 | break; |
73f73415 | 853 | case Opt_subvolid: |
1493381f WS |
854 | num = match_strdup(&args[0]); |
855 | if (num) { | |
856 | *subvol_objectid = memparse(num, NULL); | |
857 | kfree(num); | |
4849f01d | 858 | /* we want the original fs_tree */ |
1493381f | 859 | if (!*subvol_objectid) |
4849f01d JB |
860 | *subvol_objectid = |
861 | BTRFS_FS_TREE_OBJECTID; | |
2c334e87 WS |
862 | } else { |
863 | error = -EINVAL; | |
864 | goto out; | |
4849f01d | 865 | } |
73f73415 | 866 | break; |
e15d0542 | 867 | case Opt_subvolrootid: |
5e2a4b25 | 868 | printk(KERN_WARNING |
efe120a0 FH |
869 | "BTRFS: 'subvolrootid' mount option is deprecated and has " |
870 | "no effect\n"); | |
e15d0542 | 871 | break; |
43e570b0 | 872 | case Opt_device: |
83c8c9bd JL |
873 | device_name = match_strdup(&args[0]); |
874 | if (!device_name) { | |
875 | error = -ENOMEM; | |
876 | goto out; | |
877 | } | |
878 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 879 | flags, holder, fs_devices); |
83c8c9bd | 880 | kfree(device_name); |
43e570b0 | 881 | if (error) |
830c4adb | 882 | goto out; |
43e570b0 | 883 | break; |
edf24abe CH |
884 | default: |
885 | break; | |
886 | } | |
887 | } | |
888 | ||
830c4adb | 889 | out: |
3f3d0bc0 | 890 | kfree(orig); |
edf24abe | 891 | return error; |
95e05289 CM |
892 | } |
893 | ||
05dbe683 OS |
894 | static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, |
895 | u64 subvol_objectid) | |
73f73415 | 896 | { |
815745cf | 897 | struct btrfs_root *root = fs_info->tree_root; |
05dbe683 OS |
898 | struct btrfs_root *fs_root; |
899 | struct btrfs_root_ref *root_ref; | |
900 | struct btrfs_inode_ref *inode_ref; | |
901 | struct btrfs_key key; | |
902 | struct btrfs_path *path = NULL; | |
903 | char *name = NULL, *ptr; | |
904 | u64 dirid; | |
905 | int len; | |
906 | int ret; | |
907 | ||
908 | path = btrfs_alloc_path(); | |
909 | if (!path) { | |
910 | ret = -ENOMEM; | |
911 | goto err; | |
912 | } | |
913 | path->leave_spinning = 1; | |
914 | ||
915 | name = kmalloc(PATH_MAX, GFP_NOFS); | |
916 | if (!name) { | |
917 | ret = -ENOMEM; | |
918 | goto err; | |
919 | } | |
920 | ptr = name + PATH_MAX - 1; | |
921 | ptr[0] = '\0'; | |
73f73415 JB |
922 | |
923 | /* | |
05dbe683 OS |
924 | * Walk up the subvolume trees in the tree of tree roots by root |
925 | * backrefs until we hit the top-level subvolume. | |
73f73415 | 926 | */ |
05dbe683 OS |
927 | while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
928 | key.objectid = subvol_objectid; | |
929 | key.type = BTRFS_ROOT_BACKREF_KEY; | |
930 | key.offset = (u64)-1; | |
931 | ||
932 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
933 | if (ret < 0) { | |
934 | goto err; | |
935 | } else if (ret > 0) { | |
936 | ret = btrfs_previous_item(root, path, subvol_objectid, | |
937 | BTRFS_ROOT_BACKREF_KEY); | |
938 | if (ret < 0) { | |
939 | goto err; | |
940 | } else if (ret > 0) { | |
941 | ret = -ENOENT; | |
942 | goto err; | |
943 | } | |
944 | } | |
945 | ||
946 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
947 | subvol_objectid = key.offset; | |
948 | ||
949 | root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
950 | struct btrfs_root_ref); | |
951 | len = btrfs_root_ref_name_len(path->nodes[0], root_ref); | |
952 | ptr -= len + 1; | |
953 | if (ptr < name) { | |
954 | ret = -ENAMETOOLONG; | |
955 | goto err; | |
956 | } | |
957 | read_extent_buffer(path->nodes[0], ptr + 1, | |
958 | (unsigned long)(root_ref + 1), len); | |
959 | ptr[0] = '/'; | |
960 | dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); | |
961 | btrfs_release_path(path); | |
962 | ||
963 | key.objectid = subvol_objectid; | |
964 | key.type = BTRFS_ROOT_ITEM_KEY; | |
965 | key.offset = (u64)-1; | |
966 | fs_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
967 | if (IS_ERR(fs_root)) { | |
968 | ret = PTR_ERR(fs_root); | |
969 | goto err; | |
970 | } | |
971 | ||
972 | /* | |
973 | * Walk up the filesystem tree by inode refs until we hit the | |
974 | * root directory. | |
975 | */ | |
976 | while (dirid != BTRFS_FIRST_FREE_OBJECTID) { | |
977 | key.objectid = dirid; | |
978 | key.type = BTRFS_INODE_REF_KEY; | |
979 | key.offset = (u64)-1; | |
980 | ||
981 | ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); | |
982 | if (ret < 0) { | |
983 | goto err; | |
984 | } else if (ret > 0) { | |
985 | ret = btrfs_previous_item(fs_root, path, dirid, | |
986 | BTRFS_INODE_REF_KEY); | |
987 | if (ret < 0) { | |
988 | goto err; | |
989 | } else if (ret > 0) { | |
990 | ret = -ENOENT; | |
991 | goto err; | |
992 | } | |
993 | } | |
994 | ||
995 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
996 | dirid = key.offset; | |
997 | ||
998 | inode_ref = btrfs_item_ptr(path->nodes[0], | |
999 | path->slots[0], | |
1000 | struct btrfs_inode_ref); | |
1001 | len = btrfs_inode_ref_name_len(path->nodes[0], | |
1002 | inode_ref); | |
1003 | ptr -= len + 1; | |
1004 | if (ptr < name) { | |
1005 | ret = -ENAMETOOLONG; | |
1006 | goto err; | |
1007 | } | |
1008 | read_extent_buffer(path->nodes[0], ptr + 1, | |
1009 | (unsigned long)(inode_ref + 1), len); | |
1010 | ptr[0] = '/'; | |
1011 | btrfs_release_path(path); | |
1012 | } | |
73f73415 JB |
1013 | } |
1014 | ||
05dbe683 OS |
1015 | btrfs_free_path(path); |
1016 | if (ptr == name + PATH_MAX - 1) { | |
1017 | name[0] = '/'; | |
1018 | name[1] = '\0'; | |
1019 | } else { | |
1020 | memmove(name, ptr, name + PATH_MAX - ptr); | |
1021 | } | |
1022 | return name; | |
1023 | ||
1024 | err: | |
1025 | btrfs_free_path(path); | |
1026 | kfree(name); | |
1027 | return ERR_PTR(ret); | |
1028 | } | |
1029 | ||
1030 | static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) | |
1031 | { | |
1032 | struct btrfs_root *root = fs_info->tree_root; | |
1033 | struct btrfs_dir_item *di; | |
1034 | struct btrfs_path *path; | |
1035 | struct btrfs_key location; | |
1036 | u64 dir_id; | |
1037 | ||
73f73415 JB |
1038 | path = btrfs_alloc_path(); |
1039 | if (!path) | |
05dbe683 | 1040 | return -ENOMEM; |
73f73415 JB |
1041 | path->leave_spinning = 1; |
1042 | ||
1043 | /* | |
1044 | * Find the "default" dir item which points to the root item that we | |
1045 | * will mount by default if we haven't been given a specific subvolume | |
1046 | * to mount. | |
1047 | */ | |
815745cf | 1048 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 1049 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
1050 | if (IS_ERR(di)) { |
1051 | btrfs_free_path(path); | |
05dbe683 | 1052 | return PTR_ERR(di); |
b0839166 | 1053 | } |
73f73415 JB |
1054 | if (!di) { |
1055 | /* | |
1056 | * Ok the default dir item isn't there. This is weird since | |
1057 | * it's always been there, but don't freak out, just try and | |
05dbe683 | 1058 | * mount the top-level subvolume. |
73f73415 JB |
1059 | */ |
1060 | btrfs_free_path(path); | |
05dbe683 OS |
1061 | *objectid = BTRFS_FS_TREE_OBJECTID; |
1062 | return 0; | |
73f73415 JB |
1063 | } |
1064 | ||
1065 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
1066 | btrfs_free_path(path); | |
05dbe683 OS |
1067 | *objectid = location.objectid; |
1068 | return 0; | |
73f73415 JB |
1069 | } |
1070 | ||
d397712b | 1071 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 1072 | struct btrfs_fs_devices *fs_devices, |
d397712b | 1073 | void *data, int silent) |
75dfe396 | 1074 | { |
d397712b | 1075 | struct inode *inode; |
815745cf | 1076 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 1077 | struct btrfs_key key; |
39279cc3 | 1078 | int err; |
a429e513 | 1079 | |
39279cc3 CM |
1080 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
1081 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
1082 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 1083 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 1084 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 1085 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 1086 | sb->s_time_gran = 1; |
0eda294d | 1087 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 1088 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 1089 | #endif |
0c4d2d95 | 1090 | sb->s_flags |= MS_I_VERSION; |
da2f0f74 | 1091 | sb->s_iflags |= SB_I_CGROUPWB; |
ad2b2c80 AV |
1092 | err = open_ctree(sb, fs_devices, (char *)data); |
1093 | if (err) { | |
efe120a0 | 1094 | printk(KERN_ERR "BTRFS: open_ctree failed\n"); |
ad2b2c80 | 1095 | return err; |
a429e513 CM |
1096 | } |
1097 | ||
5d4f98a2 YZ |
1098 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
1099 | key.type = BTRFS_INODE_ITEM_KEY; | |
1100 | key.offset = 0; | |
98c7089c | 1101 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
1102 | if (IS_ERR(inode)) { |
1103 | err = PTR_ERR(inode); | |
39279cc3 | 1104 | goto fail_close; |
f254e52c | 1105 | } |
f254e52c | 1106 | |
48fde701 AV |
1107 | sb->s_root = d_make_root(inode); |
1108 | if (!sb->s_root) { | |
39279cc3 CM |
1109 | err = -ENOMEM; |
1110 | goto fail_close; | |
f254e52c | 1111 | } |
58176a96 | 1112 | |
6885f308 | 1113 | save_mount_options(sb, data); |
90a887c9 | 1114 | cleancache_init_fs(sb); |
59553edf | 1115 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 1116 | return 0; |
39279cc3 CM |
1117 | |
1118 | fail_close: | |
815745cf | 1119 | close_ctree(fs_info->tree_root); |
39279cc3 | 1120 | return err; |
2619ba1f CM |
1121 | } |
1122 | ||
6bf13c0c | 1123 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
1124 | { |
1125 | struct btrfs_trans_handle *trans; | |
815745cf AV |
1126 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1127 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 1128 | |
1abe9b8a | 1129 | trace_btrfs_sync_fs(wait); |
1130 | ||
39279cc3 | 1131 | if (!wait) { |
815745cf | 1132 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
1133 | return 0; |
1134 | } | |
771ed689 | 1135 | |
b0244199 | 1136 | btrfs_wait_ordered_roots(fs_info, -1); |
771ed689 | 1137 | |
d4edf39b | 1138 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 1139 | if (IS_ERR(trans)) { |
354aa0fb | 1140 | /* no transaction, don't bother */ |
6b5fe46d DS |
1141 | if (PTR_ERR(trans) == -ENOENT) { |
1142 | /* | |
1143 | * Exit unless we have some pending changes | |
1144 | * that need to go through commit | |
1145 | */ | |
1146 | if (fs_info->pending_changes == 0) | |
1147 | return 0; | |
a53f4f8e QW |
1148 | /* |
1149 | * A non-blocking test if the fs is frozen. We must not | |
1150 | * start a new transaction here otherwise a deadlock | |
1151 | * happens. The pending operations are delayed to the | |
1152 | * next commit after thawing. | |
1153 | */ | |
1154 | if (__sb_start_write(sb, SB_FREEZE_WRITE, false)) | |
1155 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1156 | else | |
1157 | return 0; | |
6b5fe46d | 1158 | trans = btrfs_start_transaction(root, 0); |
6b5fe46d | 1159 | } |
98bd5c54 DS |
1160 | if (IS_ERR(trans)) |
1161 | return PTR_ERR(trans); | |
60376ce4 | 1162 | } |
bd7de2c9 | 1163 | return btrfs_commit_transaction(trans, root); |
2c90e5d6 CM |
1164 | } |
1165 | ||
34c80b1d | 1166 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 1167 | { |
815745cf AV |
1168 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
1169 | struct btrfs_root *root = info->tree_root; | |
200da64e | 1170 | char *compress_type; |
a9572a15 EP |
1171 | |
1172 | if (btrfs_test_opt(root, DEGRADED)) | |
1173 | seq_puts(seq, ",degraded"); | |
1174 | if (btrfs_test_opt(root, NODATASUM)) | |
1175 | seq_puts(seq, ",nodatasum"); | |
1176 | if (btrfs_test_opt(root, NODATACOW)) | |
1177 | seq_puts(seq, ",nodatacow"); | |
1178 | if (btrfs_test_opt(root, NOBARRIER)) | |
1179 | seq_puts(seq, ",nobarrier"); | |
95ac567a | 1180 | if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) |
c1c9ff7c | 1181 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
a9572a15 | 1182 | if (info->alloc_start != 0) |
c1c9ff7c | 1183 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); |
a9572a15 EP |
1184 | if (info->thread_pool_size != min_t(unsigned long, |
1185 | num_online_cpus() + 2, 8)) | |
1186 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
200da64e TI |
1187 | if (btrfs_test_opt(root, COMPRESS)) { |
1188 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) | |
1189 | compress_type = "zlib"; | |
1190 | else | |
1191 | compress_type = "lzo"; | |
1192 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
1193 | seq_printf(seq, ",compress-force=%s", compress_type); | |
1194 | else | |
1195 | seq_printf(seq, ",compress=%s", compress_type); | |
1196 | } | |
c289811c CM |
1197 | if (btrfs_test_opt(root, NOSSD)) |
1198 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
1199 | if (btrfs_test_opt(root, SSD_SPREAD)) |
1200 | seq_puts(seq, ",ssd_spread"); | |
1201 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 1202 | seq_puts(seq, ",ssd"); |
3a5e1404 | 1203 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 1204 | seq_puts(seq, ",notreelog"); |
dccae999 | 1205 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 1206 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
1207 | if (btrfs_test_opt(root, DISCARD)) |
1208 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
1209 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
1210 | seq_puts(seq, ",noacl"); | |
200da64e TI |
1211 | if (btrfs_test_opt(root, SPACE_CACHE)) |
1212 | seq_puts(seq, ",space_cache"); | |
70f6d82e OS |
1213 | else if (btrfs_test_opt(root, FREE_SPACE_TREE)) |
1214 | seq_puts(seq, ",space_cache=v2"); | |
73bc1876 | 1215 | else |
8965593e | 1216 | seq_puts(seq, ",nospace_cache"); |
f420ee1e SB |
1217 | if (btrfs_test_opt(root, RESCAN_UUID_TREE)) |
1218 | seq_puts(seq, ",rescan_uuid_tree"); | |
200da64e TI |
1219 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
1220 | seq_puts(seq, ",clear_cache"); | |
1221 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
1222 | seq_puts(seq, ",user_subvol_rm_allowed"); | |
0942caa3 DS |
1223 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
1224 | seq_puts(seq, ",enospc_debug"); | |
1225 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
1226 | seq_puts(seq, ",autodefrag"); | |
1227 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) | |
1228 | seq_puts(seq, ",inode_cache"); | |
9555c6c1 ID |
1229 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
1230 | seq_puts(seq, ",skip_balance"); | |
8507d216 WS |
1231 | if (btrfs_test_opt(root, RECOVERY)) |
1232 | seq_puts(seq, ",recovery"); | |
1233 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
1234 | if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) | |
1235 | seq_puts(seq, ",check_int_data"); | |
1236 | else if (btrfs_test_opt(root, CHECK_INTEGRITY)) | |
1237 | seq_puts(seq, ",check_int"); | |
1238 | if (info->check_integrity_print_mask) | |
1239 | seq_printf(seq, ",check_int_print_mask=%d", | |
1240 | info->check_integrity_print_mask); | |
1241 | #endif | |
1242 | if (info->metadata_ratio) | |
1243 | seq_printf(seq, ",metadata_ratio=%d", | |
1244 | info->metadata_ratio); | |
8c342930 JM |
1245 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
1246 | seq_puts(seq, ",fatal_errors=panic"); | |
8b87dc17 DS |
1247 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
1248 | seq_printf(seq, ",commit=%d", info->commit_interval); | |
d0bd4560 JB |
1249 | #ifdef CONFIG_BTRFS_DEBUG |
1250 | if (btrfs_test_opt(root, FRAGMENT_DATA)) | |
1251 | seq_puts(seq, ",fragment=data"); | |
1252 | if (btrfs_test_opt(root, FRAGMENT_METADATA)) | |
1253 | seq_puts(seq, ",fragment=metadata"); | |
1254 | #endif | |
c8d3fe02 OS |
1255 | seq_printf(seq, ",subvolid=%llu", |
1256 | BTRFS_I(d_inode(dentry))->root->root_key.objectid); | |
1257 | seq_puts(seq, ",subvol="); | |
1258 | seq_dentry(seq, dentry, " \t\n\\"); | |
a9572a15 EP |
1259 | return 0; |
1260 | } | |
1261 | ||
a061fc8d | 1262 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 1263 | { |
815745cf AV |
1264 | struct btrfs_fs_info *p = data; |
1265 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 1266 | |
815745cf | 1267 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
1268 | } |
1269 | ||
450ba0ea JB |
1270 | static int btrfs_set_super(struct super_block *s, void *data) |
1271 | { | |
6de1d09d AV |
1272 | int err = set_anon_super(s, data); |
1273 | if (!err) | |
1274 | s->s_fs_info = data; | |
1275 | return err; | |
4b82d6e4 Y |
1276 | } |
1277 | ||
f9d9ef62 DS |
1278 | /* |
1279 | * subvolumes are identified by ino 256 | |
1280 | */ | |
1281 | static inline int is_subvolume_inode(struct inode *inode) | |
1282 | { | |
1283 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1284 | return 1; | |
1285 | return 0; | |
1286 | } | |
1287 | ||
830c4adb | 1288 | /* |
e6e4dbe8 OS |
1289 | * This will add subvolid=0 to the argument string while removing any subvol= |
1290 | * and subvolid= arguments to make sure we get the top-level root for path | |
1291 | * walking to the subvol we want. | |
830c4adb JB |
1292 | */ |
1293 | static char *setup_root_args(char *args) | |
1294 | { | |
e6e4dbe8 | 1295 | char *buf, *dst, *sep; |
830c4adb | 1296 | |
e6e4dbe8 OS |
1297 | if (!args) |
1298 | return kstrdup("subvolid=0", GFP_NOFS); | |
f60d16a8 | 1299 | |
e6e4dbe8 OS |
1300 | /* The worst case is that we add ",subvolid=0" to the end. */ |
1301 | buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS); | |
f60d16a8 | 1302 | if (!buf) |
830c4adb | 1303 | return NULL; |
830c4adb | 1304 | |
e6e4dbe8 OS |
1305 | while (1) { |
1306 | sep = strchrnul(args, ','); | |
1307 | if (!strstarts(args, "subvol=") && | |
1308 | !strstarts(args, "subvolid=")) { | |
1309 | memcpy(dst, args, sep - args); | |
1310 | dst += sep - args; | |
1311 | *dst++ = ','; | |
1312 | } | |
1313 | if (*sep) | |
1314 | args = sep + 1; | |
1315 | else | |
1316 | break; | |
830c4adb | 1317 | } |
f60d16a8 | 1318 | strcpy(dst, "subvolid=0"); |
830c4adb | 1319 | |
f60d16a8 | 1320 | return buf; |
830c4adb JB |
1321 | } |
1322 | ||
bb289b7b OS |
1323 | static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, |
1324 | int flags, const char *device_name, | |
1325 | char *data) | |
830c4adb | 1326 | { |
830c4adb | 1327 | struct dentry *root; |
fa330659 | 1328 | struct vfsmount *mnt = NULL; |
830c4adb | 1329 | char *newargs; |
fa330659 | 1330 | int ret; |
830c4adb JB |
1331 | |
1332 | newargs = setup_root_args(data); | |
fa330659 OS |
1333 | if (!newargs) { |
1334 | root = ERR_PTR(-ENOMEM); | |
1335 | goto out; | |
1336 | } | |
0723a047 | 1337 | |
fa330659 OS |
1338 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); |
1339 | if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { | |
0723a047 | 1340 | if (flags & MS_RDONLY) { |
fa330659 OS |
1341 | mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, |
1342 | device_name, newargs); | |
0723a047 | 1343 | } else { |
fa330659 OS |
1344 | mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, |
1345 | device_name, newargs); | |
0040e606 | 1346 | if (IS_ERR(mnt)) { |
fa330659 OS |
1347 | root = ERR_CAST(mnt); |
1348 | mnt = NULL; | |
1349 | goto out; | |
0040e606 | 1350 | } |
0723a047 | 1351 | |
773cd04e | 1352 | down_write(&mnt->mnt_sb->s_umount); |
fa330659 | 1353 | ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); |
773cd04e | 1354 | up_write(&mnt->mnt_sb->s_umount); |
fa330659 OS |
1355 | if (ret < 0) { |
1356 | root = ERR_PTR(ret); | |
1357 | goto out; | |
0723a047 HH |
1358 | } |
1359 | } | |
1360 | } | |
fa330659 OS |
1361 | if (IS_ERR(mnt)) { |
1362 | root = ERR_CAST(mnt); | |
1363 | mnt = NULL; | |
1364 | goto out; | |
1365 | } | |
830c4adb | 1366 | |
05dbe683 OS |
1367 | if (!subvol_name) { |
1368 | if (!subvol_objectid) { | |
1369 | ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), | |
1370 | &subvol_objectid); | |
1371 | if (ret) { | |
1372 | root = ERR_PTR(ret); | |
1373 | goto out; | |
1374 | } | |
1375 | } | |
1376 | subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), | |
1377 | subvol_objectid); | |
1378 | if (IS_ERR(subvol_name)) { | |
1379 | root = ERR_CAST(subvol_name); | |
1380 | subvol_name = NULL; | |
1381 | goto out; | |
1382 | } | |
1383 | ||
1384 | } | |
1385 | ||
ea441d11 | 1386 | root = mount_subtree(mnt, subvol_name); |
fa330659 OS |
1387 | /* mount_subtree() drops our reference on the vfsmount. */ |
1388 | mnt = NULL; | |
830c4adb | 1389 | |
bb289b7b | 1390 | if (!IS_ERR(root)) { |
ea441d11 | 1391 | struct super_block *s = root->d_sb; |
bb289b7b OS |
1392 | struct inode *root_inode = d_inode(root); |
1393 | u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; | |
1394 | ||
1395 | ret = 0; | |
1396 | if (!is_subvolume_inode(root_inode)) { | |
1397 | pr_err("BTRFS: '%s' is not a valid subvolume\n", | |
1398 | subvol_name); | |
1399 | ret = -EINVAL; | |
1400 | } | |
1401 | if (subvol_objectid && root_objectid != subvol_objectid) { | |
05dbe683 OS |
1402 | /* |
1403 | * This will also catch a race condition where a | |
1404 | * subvolume which was passed by ID is renamed and | |
1405 | * another subvolume is renamed over the old location. | |
1406 | */ | |
bb289b7b OS |
1407 | pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n", |
1408 | subvol_name, subvol_objectid); | |
1409 | ret = -EINVAL; | |
1410 | } | |
1411 | if (ret) { | |
1412 | dput(root); | |
1413 | root = ERR_PTR(ret); | |
1414 | deactivate_locked_super(s); | |
1415 | } | |
f9d9ef62 DS |
1416 | } |
1417 | ||
fa330659 OS |
1418 | out: |
1419 | mntput(mnt); | |
1420 | kfree(newargs); | |
1421 | kfree(subvol_name); | |
830c4adb JB |
1422 | return root; |
1423 | } | |
450ba0ea | 1424 | |
f667aef6 QW |
1425 | static int parse_security_options(char *orig_opts, |
1426 | struct security_mnt_opts *sec_opts) | |
1427 | { | |
1428 | char *secdata = NULL; | |
1429 | int ret = 0; | |
1430 | ||
1431 | secdata = alloc_secdata(); | |
1432 | if (!secdata) | |
1433 | return -ENOMEM; | |
1434 | ret = security_sb_copy_data(orig_opts, secdata); | |
1435 | if (ret) { | |
1436 | free_secdata(secdata); | |
1437 | return ret; | |
1438 | } | |
1439 | ret = security_sb_parse_opts_str(secdata, sec_opts); | |
1440 | free_secdata(secdata); | |
1441 | return ret; | |
1442 | } | |
1443 | ||
1444 | static int setup_security_options(struct btrfs_fs_info *fs_info, | |
1445 | struct super_block *sb, | |
1446 | struct security_mnt_opts *sec_opts) | |
1447 | { | |
1448 | int ret = 0; | |
1449 | ||
1450 | /* | |
1451 | * Call security_sb_set_mnt_opts() to check whether new sec_opts | |
1452 | * is valid. | |
1453 | */ | |
1454 | ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); | |
1455 | if (ret) | |
1456 | return ret; | |
1457 | ||
a43bb39b | 1458 | #ifdef CONFIG_SECURITY |
f667aef6 QW |
1459 | if (!fs_info->security_opts.num_mnt_opts) { |
1460 | /* first time security setup, copy sec_opts to fs_info */ | |
1461 | memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); | |
1462 | } else { | |
1463 | /* | |
1464 | * Since SELinux(the only one supports security_mnt_opts) does | |
1465 | * NOT support changing context during remount/mount same sb, | |
1466 | * This must be the same or part of the same security options, | |
1467 | * just free it. | |
1468 | */ | |
1469 | security_free_mnt_opts(sec_opts); | |
1470 | } | |
a43bb39b | 1471 | #endif |
f667aef6 QW |
1472 | return ret; |
1473 | } | |
1474 | ||
edf24abe CH |
1475 | /* |
1476 | * Find a superblock for the given device / mount point. | |
1477 | * | |
1478 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1479 | * for multiple device setup. Make sure to keep it in sync. | |
1480 | */ | |
061dbc6b | 1481 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1482 | const char *device_name, void *data) |
4b82d6e4 Y |
1483 | { |
1484 | struct block_device *bdev = NULL; | |
1485 | struct super_block *s; | |
8a4b83cc | 1486 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 1487 | struct btrfs_fs_info *fs_info = NULL; |
f667aef6 | 1488 | struct security_mnt_opts new_sec_opts; |
97288f2c | 1489 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1490 | char *subvol_name = NULL; |
1491 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
1492 | int error = 0; |
1493 | ||
97288f2c CH |
1494 | if (!(flags & MS_RDONLY)) |
1495 | mode |= FMODE_WRITE; | |
1496 | ||
1497 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 1498 | &subvol_name, &subvol_objectid, |
5e2a4b25 | 1499 | &fs_devices); |
f23c8af8 ID |
1500 | if (error) { |
1501 | kfree(subvol_name); | |
061dbc6b | 1502 | return ERR_PTR(error); |
f23c8af8 | 1503 | } |
edf24abe | 1504 | |
05dbe683 | 1505 | if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
fa330659 | 1506 | /* mount_subvol() will free subvol_name. */ |
bb289b7b OS |
1507 | return mount_subvol(subvol_name, subvol_objectid, flags, |
1508 | device_name, data); | |
830c4adb JB |
1509 | } |
1510 | ||
f667aef6 QW |
1511 | security_init_mnt_opts(&new_sec_opts); |
1512 | if (data) { | |
1513 | error = parse_security_options(data, &new_sec_opts); | |
1514 | if (error) | |
1515 | return ERR_PTR(error); | |
1516 | } | |
1517 | ||
306e16ce | 1518 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 1519 | if (error) |
f667aef6 | 1520 | goto error_sec_opts; |
4b82d6e4 | 1521 | |
450ba0ea JB |
1522 | /* |
1523 | * Setup a dummy root and fs_info for test/set super. This is because | |
1524 | * we don't actually fill this stuff out until open_ctree, but we need | |
1525 | * it for searching for existing supers, so this lets us do that and | |
1526 | * then open_ctree will properly initialize everything later. | |
1527 | */ | |
1528 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
f667aef6 QW |
1529 | if (!fs_info) { |
1530 | error = -ENOMEM; | |
1531 | goto error_sec_opts; | |
1532 | } | |
04d21a24 | 1533 | |
450ba0ea | 1534 | fs_info->fs_devices = fs_devices; |
450ba0ea | 1535 | |
6c41761f DS |
1536 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
1537 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
f667aef6 | 1538 | security_init_mnt_opts(&fs_info->security_opts); |
6c41761f DS |
1539 | if (!fs_info->super_copy || !fs_info->super_for_commit) { |
1540 | error = -ENOMEM; | |
04d21a24 ID |
1541 | goto error_fs_info; |
1542 | } | |
1543 | ||
1544 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1545 | if (error) | |
1546 | goto error_fs_info; | |
1547 | ||
1548 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1549 | error = -EACCES; | |
6c41761f DS |
1550 | goto error_close_devices; |
1551 | } | |
1552 | ||
dfe25020 | 1553 | bdev = fs_devices->latest_bdev; |
9249e17f DH |
1554 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
1555 | fs_info); | |
830c4adb JB |
1556 | if (IS_ERR(s)) { |
1557 | error = PTR_ERR(s); | |
1558 | goto error_close_devices; | |
1559 | } | |
4b82d6e4 Y |
1560 | |
1561 | if (s->s_root) { | |
2b82032c | 1562 | btrfs_close_devices(fs_devices); |
6c41761f | 1563 | free_fs_info(fs_info); |
59553edf AV |
1564 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1565 | error = -EBUSY; | |
4b82d6e4 | 1566 | } else { |
a1c6f057 | 1567 | snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); |
815745cf | 1568 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1569 | error = btrfs_fill_super(s, fs_devices, data, |
1570 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 1571 | } |
05dbe683 | 1572 | if (error) { |
f667aef6 | 1573 | deactivate_locked_super(s); |
f667aef6 QW |
1574 | goto error_sec_opts; |
1575 | } | |
1576 | ||
1577 | fs_info = btrfs_sb(s); | |
1578 | error = setup_security_options(fs_info, s, &new_sec_opts); | |
1579 | if (error) { | |
830c4adb | 1580 | deactivate_locked_super(s); |
f667aef6 QW |
1581 | goto error_sec_opts; |
1582 | } | |
4b82d6e4 | 1583 | |
05dbe683 | 1584 | return dget(s->s_root); |
4b82d6e4 | 1585 | |
c146afad | 1586 | error_close_devices: |
8a4b83cc | 1587 | btrfs_close_devices(fs_devices); |
04d21a24 | 1588 | error_fs_info: |
6c41761f | 1589 | free_fs_info(fs_info); |
f667aef6 QW |
1590 | error_sec_opts: |
1591 | security_free_mnt_opts(&new_sec_opts); | |
061dbc6b | 1592 | return ERR_PTR(error); |
4b82d6e4 | 1593 | } |
2e635a27 | 1594 | |
0d2450ab ST |
1595 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
1596 | int new_pool_size, int old_pool_size) | |
1597 | { | |
1598 | if (new_pool_size == old_pool_size) | |
1599 | return; | |
1600 | ||
1601 | fs_info->thread_pool_size = new_pool_size; | |
1602 | ||
efe120a0 | 1603 | btrfs_info(fs_info, "resize thread pool %d -> %d", |
0d2450ab ST |
1604 | old_pool_size, new_pool_size); |
1605 | ||
5cdc7ad3 | 1606 | btrfs_workqueue_set_max(fs_info->workers, new_pool_size); |
afe3d242 | 1607 | btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); |
a8c93d4e | 1608 | btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); |
e66f0bb1 | 1609 | btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); |
fccb5d86 QW |
1610 | btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); |
1611 | btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); | |
1612 | btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, | |
1613 | new_pool_size); | |
1614 | btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); | |
1615 | btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); | |
5b3bc44e | 1616 | btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); |
736cfa15 | 1617 | btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); |
0339ef2f QW |
1618 | btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, |
1619 | new_pool_size); | |
0d2450ab ST |
1620 | } |
1621 | ||
f42a34b2 | 1622 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
dc81cdc5 MX |
1623 | { |
1624 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
f42a34b2 | 1625 | } |
dc81cdc5 | 1626 | |
f42a34b2 MX |
1627 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
1628 | unsigned long old_opts, int flags) | |
1629 | { | |
dc81cdc5 MX |
1630 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1631 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1632 | (flags & MS_RDONLY))) { | |
1633 | /* wait for any defraggers to finish */ | |
1634 | wait_event(fs_info->transaction_wait, | |
1635 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1636 | if (flags & MS_RDONLY) | |
1637 | sync_filesystem(fs_info->sb); | |
1638 | } | |
1639 | } | |
1640 | ||
1641 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1642 | unsigned long old_opts) | |
1643 | { | |
1644 | /* | |
1645 | * We need cleanup all defragable inodes if the autodefragment is | |
1646 | * close or the fs is R/O. | |
1647 | */ | |
1648 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1649 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1650 | (fs_info->sb->s_flags & MS_RDONLY))) { | |
1651 | btrfs_cleanup_defrag_inodes(fs_info); | |
1652 | } | |
1653 | ||
1654 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1655 | } | |
1656 | ||
c146afad YZ |
1657 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1658 | { | |
815745cf AV |
1659 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1660 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1661 | unsigned old_flags = sb->s_flags; |
1662 | unsigned long old_opts = fs_info->mount_opt; | |
1663 | unsigned long old_compress_type = fs_info->compress_type; | |
1664 | u64 old_max_inline = fs_info->max_inline; | |
1665 | u64 old_alloc_start = fs_info->alloc_start; | |
1666 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1667 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
c146afad YZ |
1668 | int ret; |
1669 | ||
02b9984d | 1670 | sync_filesystem(sb); |
f42a34b2 | 1671 | btrfs_remount_prepare(fs_info); |
dc81cdc5 | 1672 | |
f667aef6 QW |
1673 | if (data) { |
1674 | struct security_mnt_opts new_sec_opts; | |
1675 | ||
1676 | security_init_mnt_opts(&new_sec_opts); | |
1677 | ret = parse_security_options(data, &new_sec_opts); | |
1678 | if (ret) | |
1679 | goto restore; | |
1680 | ret = setup_security_options(fs_info, sb, | |
1681 | &new_sec_opts); | |
1682 | if (ret) { | |
1683 | security_free_mnt_opts(&new_sec_opts); | |
1684 | goto restore; | |
1685 | } | |
1686 | } | |
1687 | ||
b288052e | 1688 | ret = btrfs_parse_options(root, data); |
49b25e05 JM |
1689 | if (ret) { |
1690 | ret = -EINVAL; | |
1691 | goto restore; | |
1692 | } | |
b288052e | 1693 | |
f42a34b2 | 1694 | btrfs_remount_begin(fs_info, old_opts, *flags); |
0d2450ab ST |
1695 | btrfs_resize_thread_pool(fs_info, |
1696 | fs_info->thread_pool_size, old_thread_pool_size); | |
1697 | ||
c146afad | 1698 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
dc81cdc5 | 1699 | goto out; |
c146afad YZ |
1700 | |
1701 | if (*flags & MS_RDONLY) { | |
8dabb742 SB |
1702 | /* |
1703 | * this also happens on 'umount -rf' or on shutdown, when | |
1704 | * the filesystem is busy. | |
1705 | */ | |
21c7e756 | 1706 | cancel_work_sync(&fs_info->async_reclaim_work); |
361c093d SB |
1707 | |
1708 | /* wait for the uuid_scan task to finish */ | |
1709 | down(&fs_info->uuid_tree_rescan_sem); | |
1710 | /* avoid complains from lockdep et al. */ | |
1711 | up(&fs_info->uuid_tree_rescan_sem); | |
1712 | ||
c146afad YZ |
1713 | sb->s_flags |= MS_RDONLY; |
1714 | ||
e44163e1 JM |
1715 | /* |
1716 | * Setting MS_RDONLY will put the cleaner thread to | |
1717 | * sleep at the next loop if it's already active. | |
1718 | * If it's already asleep, we'll leave unused block | |
1719 | * groups on disk until we're mounted read-write again | |
1720 | * unless we clean them up here. | |
1721 | */ | |
e44163e1 | 1722 | btrfs_delete_unused_bgs(fs_info); |
e44163e1 | 1723 | |
8dabb742 SB |
1724 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1725 | btrfs_scrub_cancel(fs_info); | |
061594ef | 1726 | btrfs_pause_balance(fs_info); |
8dabb742 | 1727 | |
49b25e05 JM |
1728 | ret = btrfs_commit_super(root); |
1729 | if (ret) | |
1730 | goto restore; | |
c146afad | 1731 | } else { |
6ef3de9c DS |
1732 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
1733 | btrfs_err(fs_info, | |
efe120a0 | 1734 | "Remounting read-write after error is not allowed"); |
6ef3de9c DS |
1735 | ret = -EINVAL; |
1736 | goto restore; | |
1737 | } | |
8a3db184 | 1738 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1739 | ret = -EACCES; |
1740 | goto restore; | |
8a3db184 | 1741 | } |
2b82032c | 1742 | |
292fd7fc SB |
1743 | if (fs_info->fs_devices->missing_devices > |
1744 | fs_info->num_tolerated_disk_barrier_failures && | |
1745 | !(*flags & MS_RDONLY)) { | |
efe120a0 FH |
1746 | btrfs_warn(fs_info, |
1747 | "too many missing devices, writeable remount is not allowed"); | |
292fd7fc SB |
1748 | ret = -EACCES; |
1749 | goto restore; | |
1750 | } | |
1751 | ||
8a3db184 | 1752 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1753 | ret = -EINVAL; |
1754 | goto restore; | |
8a3db184 | 1755 | } |
c146afad | 1756 | |
815745cf | 1757 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1758 | if (ret) |
1759 | goto restore; | |
c146afad | 1760 | |
d68fc57b | 1761 | /* recover relocation */ |
5f316481 | 1762 | mutex_lock(&fs_info->cleaner_mutex); |
d68fc57b | 1763 | ret = btrfs_recover_relocation(root); |
5f316481 | 1764 | mutex_unlock(&fs_info->cleaner_mutex); |
49b25e05 JM |
1765 | if (ret) |
1766 | goto restore; | |
c146afad | 1767 | |
2b6ba629 ID |
1768 | ret = btrfs_resume_balance_async(fs_info); |
1769 | if (ret) | |
1770 | goto restore; | |
1771 | ||
8dabb742 SB |
1772 | ret = btrfs_resume_dev_replace_async(fs_info); |
1773 | if (ret) { | |
efe120a0 | 1774 | btrfs_warn(fs_info, "failed to resume dev_replace"); |
8dabb742 SB |
1775 | goto restore; |
1776 | } | |
94aebfb2 JB |
1777 | |
1778 | if (!fs_info->uuid_root) { | |
efe120a0 | 1779 | btrfs_info(fs_info, "creating UUID tree"); |
94aebfb2 JB |
1780 | ret = btrfs_create_uuid_tree(fs_info); |
1781 | if (ret) { | |
efe120a0 | 1782 | btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); |
94aebfb2 JB |
1783 | goto restore; |
1784 | } | |
1785 | } | |
c146afad YZ |
1786 | sb->s_flags &= ~MS_RDONLY; |
1787 | } | |
dc81cdc5 | 1788 | out: |
2c6a92b0 | 1789 | wake_up_process(fs_info->transaction_kthread); |
dc81cdc5 | 1790 | btrfs_remount_cleanup(fs_info, old_opts); |
c146afad | 1791 | return 0; |
49b25e05 JM |
1792 | |
1793 | restore: | |
1794 | /* We've hit an error - don't reset MS_RDONLY */ | |
1795 | if (sb->s_flags & MS_RDONLY) | |
1796 | old_flags |= MS_RDONLY; | |
1797 | sb->s_flags = old_flags; | |
1798 | fs_info->mount_opt = old_opts; | |
1799 | fs_info->compress_type = old_compress_type; | |
1800 | fs_info->max_inline = old_max_inline; | |
c018daec | 1801 | mutex_lock(&fs_info->chunk_mutex); |
49b25e05 | 1802 | fs_info->alloc_start = old_alloc_start; |
c018daec | 1803 | mutex_unlock(&fs_info->chunk_mutex); |
0d2450ab ST |
1804 | btrfs_resize_thread_pool(fs_info, |
1805 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 | 1806 | fs_info->metadata_ratio = old_metadata_ratio; |
dc81cdc5 | 1807 | btrfs_remount_cleanup(fs_info, old_opts); |
49b25e05 | 1808 | return ret; |
c146afad YZ |
1809 | } |
1810 | ||
bcd53741 AJ |
1811 | /* Used to sort the devices by max_avail(descending sort) */ |
1812 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1813 | const void *dev_info2) | |
1814 | { | |
1815 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1816 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1817 | return -1; | |
1818 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1819 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1820 | return 1; | |
1821 | else | |
1822 | return 0; | |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * sort the devices by max_avail, in which max free extent size of each device | |
1827 | * is stored.(Descending Sort) | |
1828 | */ | |
1829 | static inline void btrfs_descending_sort_devices( | |
1830 | struct btrfs_device_info *devices, | |
1831 | size_t nr_devices) | |
1832 | { | |
1833 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1834 | btrfs_cmp_device_free_bytes, NULL); | |
1835 | } | |
1836 | ||
6d07bcec MX |
1837 | /* |
1838 | * The helper to calc the free space on the devices that can be used to store | |
1839 | * file data. | |
1840 | */ | |
1841 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1842 | { | |
1843 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1844 | struct btrfs_device_info *devices_info; | |
1845 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1846 | struct btrfs_device *device; | |
1847 | u64 skip_space; | |
1848 | u64 type; | |
1849 | u64 avail_space; | |
1850 | u64 used_space; | |
1851 | u64 min_stripe_size; | |
39fb26c3 | 1852 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1853 | int i = 0, nr_devices; |
1854 | int ret; | |
1855 | ||
7e33fd99 JB |
1856 | /* |
1857 | * We aren't under the device list lock, so this is racey-ish, but good | |
1858 | * enough for our purposes. | |
1859 | */ | |
b772a86e | 1860 | nr_devices = fs_info->fs_devices->open_devices; |
7e33fd99 JB |
1861 | if (!nr_devices) { |
1862 | smp_mb(); | |
1863 | nr_devices = fs_info->fs_devices->open_devices; | |
1864 | ASSERT(nr_devices); | |
1865 | if (!nr_devices) { | |
1866 | *free_bytes = 0; | |
1867 | return 0; | |
1868 | } | |
1869 | } | |
6d07bcec | 1870 | |
d9b0d9ba | 1871 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
6d07bcec MX |
1872 | GFP_NOFS); |
1873 | if (!devices_info) | |
1874 | return -ENOMEM; | |
1875 | ||
1876 | /* calc min stripe number for data space alloction */ | |
1877 | type = btrfs_get_alloc_profile(root, 1); | |
39fb26c3 | 1878 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1879 | min_stripes = 2; |
39fb26c3 MX |
1880 | num_stripes = nr_devices; |
1881 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1882 | min_stripes = 2; |
39fb26c3 MX |
1883 | num_stripes = 2; |
1884 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1885 | min_stripes = 4; |
39fb26c3 MX |
1886 | num_stripes = 4; |
1887 | } | |
6d07bcec MX |
1888 | |
1889 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1890 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1891 | else | |
1892 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1893 | ||
7e33fd99 JB |
1894 | if (fs_info->alloc_start) |
1895 | mutex_lock(&fs_devices->device_list_mutex); | |
1896 | rcu_read_lock(); | |
1897 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { | |
63a212ab SB |
1898 | if (!device->in_fs_metadata || !device->bdev || |
1899 | device->is_tgtdev_for_dev_replace) | |
6d07bcec MX |
1900 | continue; |
1901 | ||
7e33fd99 JB |
1902 | if (i >= nr_devices) |
1903 | break; | |
1904 | ||
6d07bcec MX |
1905 | avail_space = device->total_bytes - device->bytes_used; |
1906 | ||
1907 | /* align with stripe_len */ | |
f8c269d7 | 1908 | avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); |
6d07bcec MX |
1909 | avail_space *= BTRFS_STRIPE_LEN; |
1910 | ||
1911 | /* | |
1912 | * In order to avoid overwritting the superblock on the drive, | |
1913 | * btrfs starts at an offset of at least 1MB when doing chunk | |
1914 | * allocation. | |
1915 | */ | |
ee22184b | 1916 | skip_space = SZ_1M; |
6d07bcec MX |
1917 | |
1918 | /* user can set the offset in fs_info->alloc_start. */ | |
7e33fd99 JB |
1919 | if (fs_info->alloc_start && |
1920 | fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1921 | device->total_bytes) { | |
1922 | rcu_read_unlock(); | |
6d07bcec MX |
1923 | skip_space = max(fs_info->alloc_start, skip_space); |
1924 | ||
7e33fd99 JB |
1925 | /* |
1926 | * btrfs can not use the free space in | |
1927 | * [0, skip_space - 1], we must subtract it from the | |
1928 | * total. In order to implement it, we account the used | |
1929 | * space in this range first. | |
1930 | */ | |
1931 | ret = btrfs_account_dev_extents_size(device, 0, | |
1932 | skip_space - 1, | |
1933 | &used_space); | |
1934 | if (ret) { | |
1935 | kfree(devices_info); | |
1936 | mutex_unlock(&fs_devices->device_list_mutex); | |
1937 | return ret; | |
1938 | } | |
1939 | ||
1940 | rcu_read_lock(); | |
6d07bcec | 1941 | |
7e33fd99 JB |
1942 | /* calc the free space in [0, skip_space - 1] */ |
1943 | skip_space -= used_space; | |
1944 | } | |
6d07bcec MX |
1945 | |
1946 | /* | |
1947 | * we can use the free space in [0, skip_space - 1], subtract | |
1948 | * it from the total. | |
1949 | */ | |
1950 | if (avail_space && avail_space >= skip_space) | |
1951 | avail_space -= skip_space; | |
1952 | else | |
1953 | avail_space = 0; | |
1954 | ||
1955 | if (avail_space < min_stripe_size) | |
1956 | continue; | |
1957 | ||
1958 | devices_info[i].dev = device; | |
1959 | devices_info[i].max_avail = avail_space; | |
1960 | ||
1961 | i++; | |
1962 | } | |
7e33fd99 JB |
1963 | rcu_read_unlock(); |
1964 | if (fs_info->alloc_start) | |
1965 | mutex_unlock(&fs_devices->device_list_mutex); | |
6d07bcec MX |
1966 | |
1967 | nr_devices = i; | |
1968 | ||
1969 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1970 | ||
1971 | i = nr_devices - 1; | |
1972 | avail_space = 0; | |
1973 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
1974 | if (num_stripes > nr_devices) |
1975 | num_stripes = nr_devices; | |
1976 | ||
6d07bcec MX |
1977 | if (devices_info[i].max_avail >= min_stripe_size) { |
1978 | int j; | |
1979 | u64 alloc_size; | |
1980 | ||
39fb26c3 | 1981 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 1982 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 1983 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
1984 | devices_info[j].max_avail -= alloc_size; |
1985 | } | |
1986 | i--; | |
1987 | nr_devices--; | |
1988 | } | |
1989 | ||
1990 | kfree(devices_info); | |
1991 | *free_bytes = avail_space; | |
1992 | return 0; | |
1993 | } | |
1994 | ||
ba7b6e62 DS |
1995 | /* |
1996 | * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. | |
1997 | * | |
1998 | * If there's a redundant raid level at DATA block groups, use the respective | |
1999 | * multiplier to scale the sizes. | |
2000 | * | |
2001 | * Unused device space usage is based on simulating the chunk allocator | |
2002 | * algorithm that respects the device sizes, order of allocations and the | |
2003 | * 'alloc_start' value, this is a close approximation of the actual use but | |
2004 | * there are other factors that may change the result (like a new metadata | |
2005 | * chunk). | |
2006 | * | |
ca8a51b3 DS |
2007 | * If metadata is exhausted, f_bavail will be 0. |
2008 | * | |
ba7b6e62 DS |
2009 | * FIXME: not accurate for mixed block groups, total and free/used are ok, |
2010 | * available appears slightly larger. | |
2011 | */ | |
8fd17795 CM |
2012 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2013 | { | |
815745cf AV |
2014 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
2015 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
2016 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
2017 | struct btrfs_space_info *found; |
2018 | u64 total_used = 0; | |
6d07bcec | 2019 | u64 total_free_data = 0; |
ca8a51b3 | 2020 | u64 total_free_meta = 0; |
db94535d | 2021 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 2022 | __be32 *fsid = (__be32 *)fs_info->fsid; |
ba7b6e62 DS |
2023 | unsigned factor = 1; |
2024 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
6d07bcec | 2025 | int ret; |
ca8a51b3 | 2026 | u64 thresh = 0; |
8fd17795 | 2027 | |
15484377 MX |
2028 | /* |
2029 | * holding chunk_muext to avoid allocating new chunks, holding | |
2030 | * device_list_mutex to avoid the device being removed | |
2031 | */ | |
bd4d1088 | 2032 | rcu_read_lock(); |
89a55897 | 2033 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec | 2034 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
ba7b6e62 DS |
2035 | int i; |
2036 | ||
6d07bcec MX |
2037 | total_free_data += found->disk_total - found->disk_used; |
2038 | total_free_data -= | |
2039 | btrfs_account_ro_block_groups_free_space(found); | |
ba7b6e62 DS |
2040 | |
2041 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
2042 | if (!list_empty(&found->block_groups[i])) { | |
2043 | switch (i) { | |
2044 | case BTRFS_RAID_DUP: | |
2045 | case BTRFS_RAID_RAID1: | |
2046 | case BTRFS_RAID_RAID10: | |
2047 | factor = 2; | |
2048 | } | |
2049 | } | |
2050 | } | |
6d07bcec | 2051 | } |
ca8a51b3 DS |
2052 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) |
2053 | total_free_meta += found->disk_total - found->disk_used; | |
6d07bcec | 2054 | |
b742bb82 | 2055 | total_used += found->disk_used; |
89a55897 | 2056 | } |
ba7b6e62 | 2057 | |
bd4d1088 JB |
2058 | rcu_read_unlock(); |
2059 | ||
ba7b6e62 DS |
2060 | buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); |
2061 | buf->f_blocks >>= bits; | |
2062 | buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); | |
2063 | ||
2064 | /* Account global block reserve as used, it's in logical size already */ | |
2065 | spin_lock(&block_rsv->lock); | |
2066 | buf->f_bfree -= block_rsv->size >> bits; | |
2067 | spin_unlock(&block_rsv->lock); | |
2068 | ||
0d95c1be | 2069 | buf->f_bavail = div_u64(total_free_data, factor); |
815745cf | 2070 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
7e33fd99 | 2071 | if (ret) |
6d07bcec | 2072 | return ret; |
ba7b6e62 | 2073 | buf->f_bavail += div_u64(total_free_data, factor); |
6d07bcec | 2074 | buf->f_bavail = buf->f_bavail >> bits; |
d397712b | 2075 | |
ca8a51b3 DS |
2076 | /* |
2077 | * We calculate the remaining metadata space minus global reserve. If | |
2078 | * this is (supposedly) smaller than zero, there's no space. But this | |
2079 | * does not hold in practice, the exhausted state happens where's still | |
2080 | * some positive delta. So we apply some guesswork and compare the | |
2081 | * delta to a 4M threshold. (Practically observed delta was ~2M.) | |
2082 | * | |
2083 | * We probably cannot calculate the exact threshold value because this | |
2084 | * depends on the internal reservations requested by various | |
2085 | * operations, so some operations that consume a few metadata will | |
2086 | * succeed even if the Avail is zero. But this is better than the other | |
2087 | * way around. | |
2088 | */ | |
2089 | thresh = 4 * 1024 * 1024; | |
2090 | ||
2091 | if (total_free_meta - thresh < block_rsv->size) | |
2092 | buf->f_bavail = 0; | |
2093 | ||
ba7b6e62 DS |
2094 | buf->f_type = BTRFS_SUPER_MAGIC; |
2095 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2096 | buf->f_namelen = BTRFS_NAME_LEN; | |
2097 | ||
9d03632e | 2098 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 2099 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
2100 | on a big-endian or little-endian host */ |
2101 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
2102 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 | 2103 | /* Mask in the root object ID too, to disambiguate subvols */ |
2b0143b5 DH |
2104 | buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; |
2105 | buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; | |
32d48fa1 | 2106 | |
8fd17795 CM |
2107 | return 0; |
2108 | } | |
b5133862 | 2109 | |
aea52e19 AV |
2110 | static void btrfs_kill_super(struct super_block *sb) |
2111 | { | |
815745cf | 2112 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 2113 | kill_anon_super(sb); |
d22ca7de | 2114 | free_fs_info(fs_info); |
aea52e19 AV |
2115 | } |
2116 | ||
2e635a27 CM |
2117 | static struct file_system_type btrfs_fs_type = { |
2118 | .owner = THIS_MODULE, | |
2119 | .name = "btrfs", | |
061dbc6b | 2120 | .mount = btrfs_mount, |
aea52e19 | 2121 | .kill_sb = btrfs_kill_super, |
f667aef6 | 2122 | .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, |
2e635a27 | 2123 | }; |
7f78e035 | 2124 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 2125 | |
d8620958 TVB |
2126 | static int btrfs_control_open(struct inode *inode, struct file *file) |
2127 | { | |
2128 | /* | |
2129 | * The control file's private_data is used to hold the | |
2130 | * transaction when it is started and is used to keep | |
2131 | * track of whether a transaction is already in progress. | |
2132 | */ | |
2133 | file->private_data = NULL; | |
2134 | return 0; | |
2135 | } | |
2136 | ||
d352ac68 CM |
2137 | /* |
2138 | * used by btrfsctl to scan devices when no FS is mounted | |
2139 | */ | |
8a4b83cc CM |
2140 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
2141 | unsigned long arg) | |
2142 | { | |
2143 | struct btrfs_ioctl_vol_args *vol; | |
2144 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 2145 | int ret = -ENOTTY; |
8a4b83cc | 2146 | |
e441d54d CM |
2147 | if (!capable(CAP_SYS_ADMIN)) |
2148 | return -EPERM; | |
2149 | ||
dae7b665 LZ |
2150 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
2151 | if (IS_ERR(vol)) | |
2152 | return PTR_ERR(vol); | |
c071fcfd | 2153 | |
8a4b83cc CM |
2154 | switch (cmd) { |
2155 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 2156 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
2157 | &btrfs_fs_type, &fs_devices); |
2158 | break; | |
02db0844 JB |
2159 | case BTRFS_IOC_DEVICES_READY: |
2160 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
2161 | &btrfs_fs_type, &fs_devices); | |
2162 | if (ret) | |
2163 | break; | |
2164 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
2165 | break; | |
8a4b83cc | 2166 | } |
dae7b665 | 2167 | |
8a4b83cc | 2168 | kfree(vol); |
f819d837 | 2169 | return ret; |
8a4b83cc CM |
2170 | } |
2171 | ||
0176260f | 2172 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 2173 | { |
354aa0fb MX |
2174 | struct btrfs_trans_handle *trans; |
2175 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
2176 | ||
d4edf39b | 2177 | trans = btrfs_attach_transaction_barrier(root); |
354aa0fb MX |
2178 | if (IS_ERR(trans)) { |
2179 | /* no transaction, don't bother */ | |
2180 | if (PTR_ERR(trans) == -ENOENT) | |
2181 | return 0; | |
2182 | return PTR_ERR(trans); | |
2183 | } | |
2184 | return btrfs_commit_transaction(trans, root); | |
ed0dab6b Y |
2185 | } |
2186 | ||
9c5085c1 JB |
2187 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
2188 | { | |
2189 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
2190 | struct btrfs_fs_devices *cur_devices; | |
2191 | struct btrfs_device *dev, *first_dev = NULL; | |
2192 | struct list_head *head; | |
2193 | struct rcu_string *name; | |
2194 | ||
2195 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
2196 | cur_devices = fs_info->fs_devices; | |
2197 | while (cur_devices) { | |
2198 | head = &cur_devices->devices; | |
2199 | list_for_each_entry(dev, head, dev_list) { | |
aa9ddcd4 JB |
2200 | if (dev->missing) |
2201 | continue; | |
0aeb8a6e AJ |
2202 | if (!dev->name) |
2203 | continue; | |
9c5085c1 JB |
2204 | if (!first_dev || dev->devid < first_dev->devid) |
2205 | first_dev = dev; | |
2206 | } | |
2207 | cur_devices = cur_devices->seed; | |
2208 | } | |
2209 | ||
2210 | if (first_dev) { | |
2211 | rcu_read_lock(); | |
2212 | name = rcu_dereference(first_dev->name); | |
2213 | seq_escape(m, name->str, " \t\n\\"); | |
2214 | rcu_read_unlock(); | |
2215 | } else { | |
2216 | WARN_ON(1); | |
2217 | } | |
2218 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
2219 | return 0; | |
2220 | } | |
2221 | ||
b87221de | 2222 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 2223 | .drop_inode = btrfs_drop_inode, |
bd555975 | 2224 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 2225 | .put_super = btrfs_put_super, |
d5719762 | 2226 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 2227 | .show_options = btrfs_show_options, |
9c5085c1 | 2228 | .show_devname = btrfs_show_devname, |
4730a4bc | 2229 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
2230 | .alloc_inode = btrfs_alloc_inode, |
2231 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2232 | .statfs = btrfs_statfs, |
c146afad | 2233 | .remount_fs = btrfs_remount, |
0176260f | 2234 | .freeze_fs = btrfs_freeze, |
e20d96d6 | 2235 | }; |
a9218f6b CM |
2236 | |
2237 | static const struct file_operations btrfs_ctl_fops = { | |
d8620958 | 2238 | .open = btrfs_control_open, |
a9218f6b CM |
2239 | .unlocked_ioctl = btrfs_control_ioctl, |
2240 | .compat_ioctl = btrfs_control_ioctl, | |
2241 | .owner = THIS_MODULE, | |
6038f373 | 2242 | .llseek = noop_llseek, |
a9218f6b CM |
2243 | }; |
2244 | ||
2245 | static struct miscdevice btrfs_misc = { | |
578454ff | 2246 | .minor = BTRFS_MINOR, |
a9218f6b CM |
2247 | .name = "btrfs-control", |
2248 | .fops = &btrfs_ctl_fops | |
2249 | }; | |
2250 | ||
578454ff KS |
2251 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
2252 | MODULE_ALIAS("devname:btrfs-control"); | |
2253 | ||
a9218f6b CM |
2254 | static int btrfs_interface_init(void) |
2255 | { | |
2256 | return misc_register(&btrfs_misc); | |
2257 | } | |
2258 | ||
b2950863 | 2259 | static void btrfs_interface_exit(void) |
a9218f6b | 2260 | { |
f368ed60 | 2261 | misc_deregister(&btrfs_misc); |
a9218f6b CM |
2262 | } |
2263 | ||
85965600 DS |
2264 | static void btrfs_print_info(void) |
2265 | { | |
2266 | printk(KERN_INFO "Btrfs loaded" | |
2267 | #ifdef CONFIG_BTRFS_DEBUG | |
2268 | ", debug=on" | |
2269 | #endif | |
79556c3d SB |
2270 | #ifdef CONFIG_BTRFS_ASSERT |
2271 | ", assert=on" | |
2272 | #endif | |
85965600 DS |
2273 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
2274 | ", integrity-checker=on" | |
2275 | #endif | |
2276 | "\n"); | |
2277 | } | |
2278 | ||
dc11dd5d JB |
2279 | static int btrfs_run_sanity_tests(void) |
2280 | { | |
06ea65a3 JB |
2281 | int ret; |
2282 | ||
294e30fe | 2283 | ret = btrfs_init_test_fs(); |
06ea65a3 JB |
2284 | if (ret) |
2285 | return ret; | |
294e30fe JB |
2286 | |
2287 | ret = btrfs_test_free_space_cache(); | |
2288 | if (ret) | |
2289 | goto out; | |
2290 | ret = btrfs_test_extent_buffer_operations(); | |
2291 | if (ret) | |
2292 | goto out; | |
2293 | ret = btrfs_test_extent_io(); | |
aaedb55b JB |
2294 | if (ret) |
2295 | goto out; | |
2296 | ret = btrfs_test_inodes(); | |
faa2dbf0 JB |
2297 | if (ret) |
2298 | goto out; | |
2299 | ret = btrfs_test_qgroups(); | |
7c55ee0c OS |
2300 | if (ret) |
2301 | goto out; | |
2302 | ret = btrfs_test_free_space_tree(); | |
294e30fe JB |
2303 | out: |
2304 | btrfs_destroy_test_fs(); | |
2305 | return ret; | |
dc11dd5d JB |
2306 | } |
2307 | ||
2e635a27 CM |
2308 | static int __init init_btrfs_fs(void) |
2309 | { | |
2c90e5d6 | 2310 | int err; |
58176a96 | 2311 | |
14a958e6 FDBM |
2312 | err = btrfs_hash_init(); |
2313 | if (err) | |
2314 | return err; | |
2315 | ||
63541927 FDBM |
2316 | btrfs_props_init(); |
2317 | ||
58176a96 JB |
2318 | err = btrfs_init_sysfs(); |
2319 | if (err) | |
14a958e6 | 2320 | goto free_hash; |
58176a96 | 2321 | |
143bede5 | 2322 | btrfs_init_compress(); |
d1310b2e | 2323 | |
261507a0 LZ |
2324 | err = btrfs_init_cachep(); |
2325 | if (err) | |
2326 | goto free_compress; | |
2327 | ||
d1310b2e | 2328 | err = extent_io_init(); |
2f4cbe64 WB |
2329 | if (err) |
2330 | goto free_cachep; | |
2331 | ||
d1310b2e CM |
2332 | err = extent_map_init(); |
2333 | if (err) | |
2334 | goto free_extent_io; | |
2335 | ||
6352b91d | 2336 | err = ordered_data_init(); |
2f4cbe64 WB |
2337 | if (err) |
2338 | goto free_extent_map; | |
c8b97818 | 2339 | |
6352b91d MX |
2340 | err = btrfs_delayed_inode_init(); |
2341 | if (err) | |
2342 | goto free_ordered_data; | |
2343 | ||
9247f317 | 2344 | err = btrfs_auto_defrag_init(); |
16cdcec7 MX |
2345 | if (err) |
2346 | goto free_delayed_inode; | |
2347 | ||
78a6184a | 2348 | err = btrfs_delayed_ref_init(); |
9247f317 MX |
2349 | if (err) |
2350 | goto free_auto_defrag; | |
2351 | ||
b9e9a6cb WS |
2352 | err = btrfs_prelim_ref_init(); |
2353 | if (err) | |
af13b492 | 2354 | goto free_delayed_ref; |
b9e9a6cb | 2355 | |
97eb6b69 | 2356 | err = btrfs_end_io_wq_init(); |
78a6184a | 2357 | if (err) |
af13b492 | 2358 | goto free_prelim_ref; |
78a6184a | 2359 | |
97eb6b69 DS |
2360 | err = btrfs_interface_init(); |
2361 | if (err) | |
2362 | goto free_end_io_wq; | |
2363 | ||
e565d4b9 JS |
2364 | btrfs_init_lockdep(); |
2365 | ||
85965600 | 2366 | btrfs_print_info(); |
dc11dd5d JB |
2367 | |
2368 | err = btrfs_run_sanity_tests(); | |
2369 | if (err) | |
2370 | goto unregister_ioctl; | |
2371 | ||
2372 | err = register_filesystem(&btrfs_fs_type); | |
2373 | if (err) | |
2374 | goto unregister_ioctl; | |
74255aa0 | 2375 | |
2f4cbe64 WB |
2376 | return 0; |
2377 | ||
a9218f6b CM |
2378 | unregister_ioctl: |
2379 | btrfs_interface_exit(); | |
97eb6b69 DS |
2380 | free_end_io_wq: |
2381 | btrfs_end_io_wq_exit(); | |
b9e9a6cb WS |
2382 | free_prelim_ref: |
2383 | btrfs_prelim_ref_exit(); | |
78a6184a MX |
2384 | free_delayed_ref: |
2385 | btrfs_delayed_ref_exit(); | |
9247f317 MX |
2386 | free_auto_defrag: |
2387 | btrfs_auto_defrag_exit(); | |
16cdcec7 MX |
2388 | free_delayed_inode: |
2389 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
2390 | free_ordered_data: |
2391 | ordered_data_exit(); | |
2f4cbe64 WB |
2392 | free_extent_map: |
2393 | extent_map_exit(); | |
d1310b2e CM |
2394 | free_extent_io: |
2395 | extent_io_exit(); | |
2f4cbe64 WB |
2396 | free_cachep: |
2397 | btrfs_destroy_cachep(); | |
261507a0 LZ |
2398 | free_compress: |
2399 | btrfs_exit_compress(); | |
2f4cbe64 | 2400 | btrfs_exit_sysfs(); |
14a958e6 FDBM |
2401 | free_hash: |
2402 | btrfs_hash_exit(); | |
2f4cbe64 | 2403 | return err; |
2e635a27 CM |
2404 | } |
2405 | ||
2406 | static void __exit exit_btrfs_fs(void) | |
2407 | { | |
39279cc3 | 2408 | btrfs_destroy_cachep(); |
78a6184a | 2409 | btrfs_delayed_ref_exit(); |
9247f317 | 2410 | btrfs_auto_defrag_exit(); |
16cdcec7 | 2411 | btrfs_delayed_inode_exit(); |
b9e9a6cb | 2412 | btrfs_prelim_ref_exit(); |
6352b91d | 2413 | ordered_data_exit(); |
a52d9a80 | 2414 | extent_map_exit(); |
d1310b2e | 2415 | extent_io_exit(); |
a9218f6b | 2416 | btrfs_interface_exit(); |
5ed5f588 | 2417 | btrfs_end_io_wq_exit(); |
2e635a27 | 2418 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 2419 | btrfs_exit_sysfs(); |
8a4b83cc | 2420 | btrfs_cleanup_fs_uuids(); |
261507a0 | 2421 | btrfs_exit_compress(); |
14a958e6 | 2422 | btrfs_hash_exit(); |
2e635a27 CM |
2423 | } |
2424 | ||
60efa5eb | 2425 | late_initcall(init_btrfs_fs); |
2e635a27 CM |
2426 | module_exit(exit_btrfs_fs) |
2427 | ||
2428 | MODULE_LICENSE("GPL"); |