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 | ||
08748810 | 72 | static 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 | ||
533574c6 | 133 | #ifdef CONFIG_PRINTK |
acce952b | 134 | /* |
135 | * __btrfs_std_error decodes expected errors from the caller and | |
136 | * invokes the approciate error response. | |
137 | */ | |
c0d19e2b | 138 | __cold |
acce952b | 139 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, |
4da35113 | 140 | unsigned int line, int errno, const char *fmt, ...) |
acce952b | 141 | { |
142 | struct super_block *sb = fs_info->sb; | |
acce952b | 143 | const char *errstr; |
144 | ||
145 | /* | |
146 | * Special case: if the error is EROFS, and we're already | |
147 | * under MS_RDONLY, then it is safe here. | |
148 | */ | |
149 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
4da35113 JM |
150 | return; |
151 | ||
08748810 | 152 | errstr = btrfs_decode_error(errno); |
4da35113 | 153 | if (fmt) { |
37252a66 ES |
154 | struct va_format vaf; |
155 | va_list args; | |
156 | ||
157 | va_start(args, fmt); | |
158 | vaf.fmt = fmt; | |
159 | vaf.va = &args; | |
4da35113 | 160 | |
efe120a0 FH |
161 | printk(KERN_CRIT |
162 | "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", | |
08748810 | 163 | sb->s_id, function, line, errno, errstr, &vaf); |
37252a66 | 164 | va_end(args); |
4da35113 | 165 | } else { |
efe120a0 | 166 | printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", |
08748810 | 167 | sb->s_id, function, line, errno, errstr); |
4da35113 | 168 | } |
acce952b | 169 | |
4da35113 | 170 | /* Don't go through full error handling during mount */ |
cf79ffb5 JB |
171 | save_error_info(fs_info); |
172 | if (sb->s_flags & MS_BORN) | |
4da35113 | 173 | btrfs_handle_error(fs_info); |
4da35113 | 174 | } |
acce952b | 175 | |
533574c6 | 176 | static const char * const logtypes[] = { |
4da35113 JM |
177 | "emergency", |
178 | "alert", | |
179 | "critical", | |
180 | "error", | |
181 | "warning", | |
182 | "notice", | |
183 | "info", | |
184 | "debug", | |
185 | }; | |
186 | ||
c2cf52eb | 187 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
4da35113 JM |
188 | { |
189 | struct super_block *sb = fs_info->sb; | |
190 | char lvl[4]; | |
191 | struct va_format vaf; | |
192 | va_list args; | |
193 | const char *type = logtypes[4]; | |
533574c6 | 194 | int kern_level; |
4da35113 JM |
195 | |
196 | va_start(args, fmt); | |
197 | ||
533574c6 JP |
198 | kern_level = printk_get_level(fmt); |
199 | if (kern_level) { | |
200 | size_t size = printk_skip_level(fmt) - fmt; | |
201 | memcpy(lvl, fmt, size); | |
202 | lvl[size] = '\0'; | |
203 | fmt += size; | |
204 | type = logtypes[kern_level - '0']; | |
4da35113 JM |
205 | } else |
206 | *lvl = '\0'; | |
207 | ||
208 | vaf.fmt = fmt; | |
209 | vaf.va = &args; | |
533574c6 | 210 | |
c2cf52eb | 211 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); |
533574c6 JP |
212 | |
213 | va_end(args); | |
214 | } | |
215 | ||
216 | #else | |
217 | ||
218 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
219 | unsigned int line, int errno, const char *fmt, ...) | |
220 | { | |
221 | struct super_block *sb = fs_info->sb; | |
222 | ||
223 | /* | |
224 | * Special case: if the error is EROFS, and we're already | |
225 | * under MS_RDONLY, then it is safe here. | |
226 | */ | |
227 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
228 | return; | |
229 | ||
230 | /* Don't go through full error handling during mount */ | |
231 | if (sb->s_flags & MS_BORN) { | |
232 | save_error_info(fs_info); | |
233 | btrfs_handle_error(fs_info); | |
234 | } | |
acce952b | 235 | } |
533574c6 | 236 | #endif |
acce952b | 237 | |
49b25e05 JM |
238 | /* |
239 | * We only mark the transaction aborted and then set the file system read-only. | |
240 | * This will prevent new transactions from starting or trying to join this | |
241 | * one. | |
242 | * | |
243 | * This means that error recovery at the call site is limited to freeing | |
244 | * any local memory allocations and passing the error code up without | |
245 | * further cleanup. The transaction should complete as it normally would | |
246 | * in the call path but will return -EIO. | |
247 | * | |
248 | * We'll complete the cleanup in btrfs_end_transaction and | |
249 | * btrfs_commit_transaction. | |
250 | */ | |
c0d19e2b | 251 | __cold |
49b25e05 JM |
252 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, |
253 | struct btrfs_root *root, const char *function, | |
254 | unsigned int line, int errno) | |
255 | { | |
49b25e05 JM |
256 | trans->aborted = errno; |
257 | /* Nothing used. The other threads that have joined this | |
258 | * transaction may be able to continue. */ | |
c92f6be3 | 259 | if (!trans->blocks_used && list_empty(&trans->new_bgs)) { |
69ce977a MX |
260 | const char *errstr; |
261 | ||
08748810 | 262 | errstr = btrfs_decode_error(errno); |
c2cf52eb SK |
263 | btrfs_warn(root->fs_info, |
264 | "%s:%d: Aborting unused transaction(%s).", | |
265 | function, line, errstr); | |
acce952b | 266 | return; |
49b25e05 | 267 | } |
8d25a086 | 268 | ACCESS_ONCE(trans->transaction->aborted) = errno; |
501407aa JB |
269 | /* Wake up anybody who may be waiting on this transaction */ |
270 | wake_up(&root->fs_info->transaction_wait); | |
271 | wake_up(&root->fs_info->transaction_blocked_wait); | |
49b25e05 JM |
272 | __btrfs_std_error(root->fs_info, function, line, errno, NULL); |
273 | } | |
8c342930 JM |
274 | /* |
275 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
276 | * issues an alert, and either panics or BUGs, depending on mount options. | |
277 | */ | |
c0d19e2b | 278 | __cold |
8c342930 JM |
279 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, |
280 | unsigned int line, int errno, const char *fmt, ...) | |
281 | { | |
8c342930 JM |
282 | char *s_id = "<unknown>"; |
283 | const char *errstr; | |
284 | struct va_format vaf = { .fmt = fmt }; | |
285 | va_list args; | |
acce952b | 286 | |
8c342930 JM |
287 | if (fs_info) |
288 | s_id = fs_info->sb->s_id; | |
acce952b | 289 | |
8c342930 JM |
290 | va_start(args, fmt); |
291 | vaf.va = &args; | |
292 | ||
08748810 | 293 | errstr = btrfs_decode_error(errno); |
aa43a17c | 294 | if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) |
08748810 DS |
295 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
296 | s_id, function, line, &vaf, errno, errstr); | |
8c342930 | 297 | |
efe120a0 FH |
298 | btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", |
299 | function, line, &vaf, errno, errstr); | |
8c342930 JM |
300 | va_end(args); |
301 | /* Caller calls BUG() */ | |
acce952b | 302 | } |
303 | ||
d397712b | 304 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 305 | { |
3abdbd78 | 306 | close_ctree(btrfs_sb(sb)->tree_root); |
75dfe396 CM |
307 | } |
308 | ||
95e05289 | 309 | enum { |
73f73415 | 310 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
311 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
312 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
261507a0 LZ |
313 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
314 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
91435650 | 315 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
9555c6c1 ID |
316 | Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, |
317 | Opt_no_space_cache, Opt_recovery, Opt_skip_balance, | |
21adbd5c | 318 | Opt_check_integrity, Opt_check_integrity_including_extent_data, |
f420ee1e | 319 | Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, |
e07a2ade | 320 | Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, |
a258af7a | 321 | Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, |
3818aea2 | 322 | Opt_datasum, Opt_treelog, Opt_noinode_cache, |
9555c6c1 | 323 | Opt_err, |
95e05289 CM |
324 | }; |
325 | ||
326 | static match_table_t tokens = { | |
dfe25020 | 327 | {Opt_degraded, "degraded"}, |
95e05289 | 328 | {Opt_subvol, "subvol=%s"}, |
1493381f | 329 | {Opt_subvolid, "subvolid=%s"}, |
43e570b0 | 330 | {Opt_device, "device=%s"}, |
b6cda9bc | 331 | {Opt_nodatasum, "nodatasum"}, |
d399167d | 332 | {Opt_datasum, "datasum"}, |
be20aa9d | 333 | {Opt_nodatacow, "nodatacow"}, |
a258af7a | 334 | {Opt_datacow, "datacow"}, |
21ad10cf | 335 | {Opt_nobarrier, "nobarrier"}, |
842bef58 | 336 | {Opt_barrier, "barrier"}, |
6f568d35 | 337 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 338 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 339 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 340 | {Opt_compress, "compress"}, |
261507a0 | 341 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 342 | {Opt_compress_force, "compress-force"}, |
261507a0 | 343 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 344 | {Opt_ssd, "ssd"}, |
451d7585 | 345 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 346 | {Opt_nossd, "nossd"}, |
bd0330ad | 347 | {Opt_acl, "acl"}, |
33268eaf | 348 | {Opt_noacl, "noacl"}, |
3a5e1404 | 349 | {Opt_notreelog, "notreelog"}, |
a88998f2 | 350 | {Opt_treelog, "treelog"}, |
dccae999 | 351 | {Opt_flushoncommit, "flushoncommit"}, |
2c9ee856 | 352 | {Opt_noflushoncommit, "noflushoncommit"}, |
97e728d4 | 353 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 354 | {Opt_discard, "discard"}, |
e07a2ade | 355 | {Opt_nodiscard, "nodiscard"}, |
0af3d00b | 356 | {Opt_space_cache, "space_cache"}, |
88c2ba3b | 357 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 358 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 359 | {Opt_enospc_debug, "enospc_debug"}, |
53036293 | 360 | {Opt_noenospc_debug, "noenospc_debug"}, |
e15d0542 | 361 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 362 | {Opt_defrag, "autodefrag"}, |
fc0ca9af | 363 | {Opt_nodefrag, "noautodefrag"}, |
4b9465cb | 364 | {Opt_inode_cache, "inode_cache"}, |
3818aea2 | 365 | {Opt_noinode_cache, "noinode_cache"}, |
8965593e | 366 | {Opt_no_space_cache, "nospace_cache"}, |
af31f5e5 | 367 | {Opt_recovery, "recovery"}, |
9555c6c1 | 368 | {Opt_skip_balance, "skip_balance"}, |
21adbd5c SB |
369 | {Opt_check_integrity, "check_int"}, |
370 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
371 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, | |
f420ee1e | 372 | {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, |
8c342930 | 373 | {Opt_fatal_errors, "fatal_errors=%s"}, |
8b87dc17 | 374 | {Opt_commit_interval, "commit=%d"}, |
33268eaf | 375 | {Opt_err, NULL}, |
95e05289 CM |
376 | }; |
377 | ||
edf24abe CH |
378 | /* |
379 | * Regular mount options parser. Everything that is needed only when | |
380 | * reading in a new superblock is parsed here. | |
49b25e05 | 381 | * XXX JDM: This needs to be cleaned up for remount. |
edf24abe CH |
382 | */ |
383 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 384 | { |
edf24abe | 385 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 386 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
387 | char *p, *num, *orig = NULL; |
388 | u64 cache_gen; | |
4543df7e | 389 | int intarg; |
a7a3f7ca | 390 | int ret = 0; |
261507a0 LZ |
391 | char *compress_type; |
392 | bool compress_force = false; | |
b6cda9bc | 393 | |
6c41761f | 394 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 JB |
395 | if (cache_gen) |
396 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); | |
397 | ||
95e05289 | 398 | if (!options) |
73bc1876 | 399 | goto out; |
95e05289 | 400 | |
be20aa9d CM |
401 | /* |
402 | * strsep changes the string, duplicate it because parse_options | |
403 | * gets called twice | |
404 | */ | |
405 | options = kstrdup(options, GFP_NOFS); | |
406 | if (!options) | |
407 | return -ENOMEM; | |
408 | ||
da495ecc | 409 | orig = options; |
be20aa9d | 410 | |
edf24abe | 411 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
412 | int token; |
413 | if (!*p) | |
414 | continue; | |
415 | ||
416 | token = match_token(p, tokens, args); | |
417 | switch (token) { | |
dfe25020 | 418 | case Opt_degraded: |
efe120a0 | 419 | btrfs_info(root->fs_info, "allowing degraded mounts"); |
edf24abe | 420 | btrfs_set_opt(info->mount_opt, DEGRADED); |
dfe25020 | 421 | break; |
95e05289 | 422 | case Opt_subvol: |
73f73415 | 423 | case Opt_subvolid: |
e15d0542 | 424 | case Opt_subvolrootid: |
43e570b0 | 425 | case Opt_device: |
edf24abe | 426 | /* |
43e570b0 | 427 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
428 | * and can be happily ignored here. |
429 | */ | |
b6cda9bc CM |
430 | break; |
431 | case Opt_nodatasum: | |
07802534 QW |
432 | btrfs_set_and_info(root, NODATASUM, |
433 | "setting nodatasum"); | |
be20aa9d | 434 | break; |
d399167d | 435 | case Opt_datasum: |
07802534 QW |
436 | if (btrfs_test_opt(root, NODATASUM)) { |
437 | if (btrfs_test_opt(root, NODATACOW)) | |
438 | btrfs_info(root->fs_info, "setting datasum, datacow enabled"); | |
439 | else | |
440 | btrfs_info(root->fs_info, "setting datasum"); | |
441 | } | |
d399167d QW |
442 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
443 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
444 | break; | |
be20aa9d | 445 | case Opt_nodatacow: |
07802534 QW |
446 | if (!btrfs_test_opt(root, NODATACOW)) { |
447 | if (!btrfs_test_opt(root, COMPRESS) || | |
448 | !btrfs_test_opt(root, FORCE_COMPRESS)) { | |
efe120a0 | 449 | btrfs_info(root->fs_info, |
07802534 QW |
450 | "setting nodatacow, compression disabled"); |
451 | } else { | |
452 | btrfs_info(root->fs_info, "setting nodatacow"); | |
453 | } | |
bedb2cca | 454 | } |
bedb2cca AP |
455 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
456 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
edf24abe CH |
457 | btrfs_set_opt(info->mount_opt, NODATACOW); |
458 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 459 | break; |
a258af7a | 460 | case Opt_datacow: |
07802534 QW |
461 | btrfs_clear_and_info(root, NODATACOW, |
462 | "setting datacow"); | |
a258af7a | 463 | break; |
a555f810 | 464 | case Opt_compress_force: |
261507a0 LZ |
465 | case Opt_compress_force_type: |
466 | compress_force = true; | |
1c697d4a | 467 | /* Fallthrough */ |
261507a0 LZ |
468 | case Opt_compress: |
469 | case Opt_compress_type: | |
470 | if (token == Opt_compress || | |
471 | token == Opt_compress_force || | |
472 | strcmp(args[0].from, "zlib") == 0) { | |
473 | compress_type = "zlib"; | |
474 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
063849ea | 475 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
476 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
477 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
a6fa6fae LZ |
478 | } else if (strcmp(args[0].from, "lzo") == 0) { |
479 | compress_type = "lzo"; | |
480 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 481 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
482 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
483 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
2b0ce2c2 | 484 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
063849ea AH |
485 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
486 | compress_type = "no"; | |
063849ea AH |
487 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
488 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
489 | compress_force = false; | |
261507a0 LZ |
490 | } else { |
491 | ret = -EINVAL; | |
492 | goto out; | |
493 | } | |
494 | ||
261507a0 | 495 | if (compress_force) { |
07802534 QW |
496 | btrfs_set_and_info(root, FORCE_COMPRESS, |
497 | "force %s compression", | |
498 | compress_type); | |
143f3636 | 499 | } else { |
07802534 QW |
500 | if (!btrfs_test_opt(root, COMPRESS)) |
501 | btrfs_info(root->fs_info, | |
351fd353 | 502 | "btrfs: use %s compression", |
07802534 | 503 | compress_type); |
4027e0f4 WS |
504 | /* |
505 | * If we remount from compress-force=xxx to | |
506 | * compress=xxx, we need clear FORCE_COMPRESS | |
507 | * flag, otherwise, there is no way for users | |
508 | * to disable forcible compression separately. | |
509 | */ | |
510 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
a7e252af | 511 | } |
a555f810 | 512 | break; |
e18e4809 | 513 | case Opt_ssd: |
07802534 QW |
514 | btrfs_set_and_info(root, SSD, |
515 | "use ssd allocation scheme"); | |
e18e4809 | 516 | break; |
451d7585 | 517 | case Opt_ssd_spread: |
07802534 QW |
518 | btrfs_set_and_info(root, SSD_SPREAD, |
519 | "use spread ssd allocation scheme"); | |
2aa06a35 | 520 | btrfs_set_opt(info->mount_opt, SSD); |
451d7585 | 521 | break; |
3b30c22f | 522 | case Opt_nossd: |
2aa06a35 | 523 | btrfs_set_and_info(root, NOSSD, |
07802534 | 524 | "not using ssd allocation scheme"); |
3b30c22f CM |
525 | btrfs_clear_opt(info->mount_opt, SSD); |
526 | break; | |
842bef58 | 527 | case Opt_barrier: |
07802534 QW |
528 | btrfs_clear_and_info(root, NOBARRIER, |
529 | "turning on barriers"); | |
842bef58 | 530 | break; |
21ad10cf | 531 | case Opt_nobarrier: |
07802534 QW |
532 | btrfs_set_and_info(root, NOBARRIER, |
533 | "turning off barriers"); | |
21ad10cf | 534 | break; |
4543df7e | 535 | case Opt_thread_pool: |
2c334e87 WS |
536 | ret = match_int(&args[0], &intarg); |
537 | if (ret) { | |
538 | goto out; | |
539 | } else if (intarg > 0) { | |
4543df7e | 540 | info->thread_pool_size = intarg; |
2c334e87 WS |
541 | } else { |
542 | ret = -EINVAL; | |
543 | goto out; | |
544 | } | |
4543df7e | 545 | break; |
6f568d35 | 546 | case Opt_max_inline: |
edf24abe CH |
547 | num = match_strdup(&args[0]); |
548 | if (num) { | |
91748467 | 549 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
550 | kfree(num); |
551 | ||
15ada040 | 552 | if (info->max_inline) { |
feb5f965 | 553 | info->max_inline = min_t(u64, |
15ada040 CM |
554 | info->max_inline, |
555 | root->sectorsize); | |
556 | } | |
efe120a0 | 557 | btrfs_info(root->fs_info, "max_inline at %llu", |
c1c9ff7c | 558 | info->max_inline); |
2c334e87 WS |
559 | } else { |
560 | ret = -ENOMEM; | |
561 | goto out; | |
6f568d35 CM |
562 | } |
563 | break; | |
8f662a76 | 564 | case Opt_alloc_start: |
edf24abe CH |
565 | num = match_strdup(&args[0]); |
566 | if (num) { | |
c018daec | 567 | mutex_lock(&info->chunk_mutex); |
91748467 | 568 | info->alloc_start = memparse(num, NULL); |
c018daec | 569 | mutex_unlock(&info->chunk_mutex); |
edf24abe | 570 | kfree(num); |
efe120a0 | 571 | btrfs_info(root->fs_info, "allocations start at %llu", |
c1c9ff7c | 572 | info->alloc_start); |
2c334e87 WS |
573 | } else { |
574 | ret = -ENOMEM; | |
575 | goto out; | |
8f662a76 CM |
576 | } |
577 | break; | |
bd0330ad | 578 | case Opt_acl: |
45ff35d6 | 579 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
bd0330ad QW |
580 | root->fs_info->sb->s_flags |= MS_POSIXACL; |
581 | break; | |
45ff35d6 GZ |
582 | #else |
583 | btrfs_err(root->fs_info, | |
584 | "support for ACL not compiled in!"); | |
585 | ret = -EINVAL; | |
586 | goto out; | |
587 | #endif | |
33268eaf JB |
588 | case Opt_noacl: |
589 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
590 | break; | |
3a5e1404 | 591 | case Opt_notreelog: |
07802534 QW |
592 | btrfs_set_and_info(root, NOTREELOG, |
593 | "disabling tree log"); | |
a88998f2 QW |
594 | break; |
595 | case Opt_treelog: | |
07802534 QW |
596 | btrfs_clear_and_info(root, NOTREELOG, |
597 | "enabling tree log"); | |
3a5e1404 | 598 | break; |
dccae999 | 599 | case Opt_flushoncommit: |
07802534 QW |
600 | btrfs_set_and_info(root, FLUSHONCOMMIT, |
601 | "turning on flush-on-commit"); | |
dccae999 | 602 | break; |
2c9ee856 | 603 | case Opt_noflushoncommit: |
07802534 QW |
604 | btrfs_clear_and_info(root, FLUSHONCOMMIT, |
605 | "turning off flush-on-commit"); | |
2c9ee856 | 606 | break; |
97e728d4 | 607 | case Opt_ratio: |
2c334e87 WS |
608 | ret = match_int(&args[0], &intarg); |
609 | if (ret) { | |
610 | goto out; | |
611 | } else if (intarg >= 0) { | |
97e728d4 | 612 | info->metadata_ratio = intarg; |
efe120a0 | 613 | btrfs_info(root->fs_info, "metadata ratio %d", |
97e728d4 | 614 | info->metadata_ratio); |
2c334e87 WS |
615 | } else { |
616 | ret = -EINVAL; | |
617 | goto out; | |
97e728d4 JB |
618 | } |
619 | break; | |
e244a0ae | 620 | case Opt_discard: |
07802534 QW |
621 | btrfs_set_and_info(root, DISCARD, |
622 | "turning on discard"); | |
e244a0ae | 623 | break; |
e07a2ade | 624 | case Opt_nodiscard: |
07802534 QW |
625 | btrfs_clear_and_info(root, DISCARD, |
626 | "turning off discard"); | |
e07a2ade | 627 | break; |
0af3d00b | 628 | case Opt_space_cache: |
07802534 QW |
629 | btrfs_set_and_info(root, SPACE_CACHE, |
630 | "enabling disk space caching"); | |
0de90876 | 631 | break; |
f420ee1e SB |
632 | case Opt_rescan_uuid_tree: |
633 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); | |
634 | break; | |
73bc1876 | 635 | case Opt_no_space_cache: |
07802534 QW |
636 | btrfs_clear_and_info(root, SPACE_CACHE, |
637 | "disabling disk space caching"); | |
73bc1876 | 638 | break; |
4b9465cb | 639 | case Opt_inode_cache: |
7e1876ac | 640 | btrfs_set_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 641 | "enabling inode map caching"); |
3818aea2 QW |
642 | break; |
643 | case Opt_noinode_cache: | |
7e1876ac | 644 | btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 645 | "disabling inode map caching"); |
4b9465cb | 646 | break; |
88c2ba3b | 647 | case Opt_clear_cache: |
07802534 QW |
648 | btrfs_set_and_info(root, CLEAR_CACHE, |
649 | "force clearing of disk cache"); | |
0af3d00b | 650 | break; |
4260f7c7 SW |
651 | case Opt_user_subvol_rm_allowed: |
652 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
653 | break; | |
91435650 CM |
654 | case Opt_enospc_debug: |
655 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
656 | break; | |
53036293 QW |
657 | case Opt_noenospc_debug: |
658 | btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); | |
659 | break; | |
4cb5300b | 660 | case Opt_defrag: |
07802534 QW |
661 | btrfs_set_and_info(root, AUTO_DEFRAG, |
662 | "enabling auto defrag"); | |
4cb5300b | 663 | break; |
fc0ca9af | 664 | case Opt_nodefrag: |
07802534 QW |
665 | btrfs_clear_and_info(root, AUTO_DEFRAG, |
666 | "disabling auto defrag"); | |
fc0ca9af | 667 | break; |
af31f5e5 | 668 | case Opt_recovery: |
efe120a0 | 669 | btrfs_info(root->fs_info, "enabling auto recovery"); |
af31f5e5 CM |
670 | btrfs_set_opt(info->mount_opt, RECOVERY); |
671 | break; | |
9555c6c1 ID |
672 | case Opt_skip_balance: |
673 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
674 | break; | |
21adbd5c SB |
675 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
676 | case Opt_check_integrity_including_extent_data: | |
efe120a0 FH |
677 | btrfs_info(root->fs_info, |
678 | "enabling check integrity including extent data"); | |
21adbd5c SB |
679 | btrfs_set_opt(info->mount_opt, |
680 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
681 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
682 | break; | |
683 | case Opt_check_integrity: | |
efe120a0 | 684 | btrfs_info(root->fs_info, "enabling check integrity"); |
21adbd5c SB |
685 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
686 | break; | |
687 | case Opt_check_integrity_print_mask: | |
2c334e87 WS |
688 | ret = match_int(&args[0], &intarg); |
689 | if (ret) { | |
690 | goto out; | |
691 | } else if (intarg >= 0) { | |
21adbd5c | 692 | info->check_integrity_print_mask = intarg; |
efe120a0 | 693 | btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", |
21adbd5c | 694 | info->check_integrity_print_mask); |
2c334e87 WS |
695 | } else { |
696 | ret = -EINVAL; | |
697 | goto out; | |
21adbd5c SB |
698 | } |
699 | break; | |
700 | #else | |
701 | case Opt_check_integrity_including_extent_data: | |
702 | case Opt_check_integrity: | |
703 | case Opt_check_integrity_print_mask: | |
efe120a0 FH |
704 | btrfs_err(root->fs_info, |
705 | "support for check_integrity* not compiled in!"); | |
21adbd5c SB |
706 | ret = -EINVAL; |
707 | goto out; | |
708 | #endif | |
8c342930 JM |
709 | case Opt_fatal_errors: |
710 | if (strcmp(args[0].from, "panic") == 0) | |
711 | btrfs_set_opt(info->mount_opt, | |
712 | PANIC_ON_FATAL_ERROR); | |
713 | else if (strcmp(args[0].from, "bug") == 0) | |
714 | btrfs_clear_opt(info->mount_opt, | |
715 | PANIC_ON_FATAL_ERROR); | |
716 | else { | |
717 | ret = -EINVAL; | |
718 | goto out; | |
719 | } | |
720 | break; | |
8b87dc17 DS |
721 | case Opt_commit_interval: |
722 | intarg = 0; | |
723 | ret = match_int(&args[0], &intarg); | |
724 | if (ret < 0) { | |
efe120a0 | 725 | btrfs_err(root->fs_info, "invalid commit interval"); |
8b87dc17 DS |
726 | ret = -EINVAL; |
727 | goto out; | |
728 | } | |
729 | if (intarg > 0) { | |
730 | if (intarg > 300) { | |
efe120a0 | 731 | btrfs_warn(root->fs_info, "excessive commit interval %d", |
8b87dc17 DS |
732 | intarg); |
733 | } | |
734 | info->commit_interval = intarg; | |
735 | } else { | |
efe120a0 | 736 | btrfs_info(root->fs_info, "using default commit interval %ds", |
8b87dc17 DS |
737 | BTRFS_DEFAULT_COMMIT_INTERVAL); |
738 | info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; | |
739 | } | |
740 | break; | |
a7a3f7ca | 741 | case Opt_err: |
efe120a0 | 742 | btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); |
a7a3f7ca SW |
743 | ret = -EINVAL; |
744 | goto out; | |
95e05289 | 745 | default: |
be20aa9d | 746 | break; |
95e05289 CM |
747 | } |
748 | } | |
a7a3f7ca | 749 | out: |
73bc1876 | 750 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
efe120a0 | 751 | btrfs_info(root->fs_info, "disk space caching is enabled"); |
da495ecc | 752 | kfree(orig); |
a7a3f7ca | 753 | return ret; |
edf24abe CH |
754 | } |
755 | ||
756 | /* | |
757 | * Parse mount options that are required early in the mount process. | |
758 | * | |
759 | * All other options will be parsed on much later in the mount process and | |
760 | * only when we need to allocate a new super block. | |
761 | */ | |
97288f2c | 762 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 763 | void *holder, char **subvol_name, u64 *subvol_objectid, |
5e2a4b25 | 764 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
765 | { |
766 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 767 | char *device_name, *opts, *orig, *p; |
1493381f | 768 | char *num = NULL; |
edf24abe CH |
769 | int error = 0; |
770 | ||
771 | if (!options) | |
830c4adb | 772 | return 0; |
edf24abe CH |
773 | |
774 | /* | |
775 | * strsep changes the string, duplicate it because parse_options | |
776 | * gets called twice | |
777 | */ | |
778 | opts = kstrdup(options, GFP_KERNEL); | |
779 | if (!opts) | |
780 | return -ENOMEM; | |
3f3d0bc0 | 781 | orig = opts; |
edf24abe CH |
782 | |
783 | while ((p = strsep(&opts, ",")) != NULL) { | |
784 | int token; | |
785 | if (!*p) | |
786 | continue; | |
787 | ||
788 | token = match_token(p, tokens, args); | |
789 | switch (token) { | |
790 | case Opt_subvol: | |
a90e8b6f | 791 | kfree(*subvol_name); |
edf24abe | 792 | *subvol_name = match_strdup(&args[0]); |
2c334e87 WS |
793 | if (!*subvol_name) { |
794 | error = -ENOMEM; | |
795 | goto out; | |
796 | } | |
edf24abe | 797 | break; |
73f73415 | 798 | case Opt_subvolid: |
1493381f WS |
799 | num = match_strdup(&args[0]); |
800 | if (num) { | |
801 | *subvol_objectid = memparse(num, NULL); | |
802 | kfree(num); | |
4849f01d | 803 | /* we want the original fs_tree */ |
1493381f | 804 | if (!*subvol_objectid) |
4849f01d JB |
805 | *subvol_objectid = |
806 | BTRFS_FS_TREE_OBJECTID; | |
2c334e87 WS |
807 | } else { |
808 | error = -EINVAL; | |
809 | goto out; | |
4849f01d | 810 | } |
73f73415 | 811 | break; |
e15d0542 | 812 | case Opt_subvolrootid: |
5e2a4b25 | 813 | printk(KERN_WARNING |
efe120a0 FH |
814 | "BTRFS: 'subvolrootid' mount option is deprecated and has " |
815 | "no effect\n"); | |
e15d0542 | 816 | break; |
43e570b0 | 817 | case Opt_device: |
83c8c9bd JL |
818 | device_name = match_strdup(&args[0]); |
819 | if (!device_name) { | |
820 | error = -ENOMEM; | |
821 | goto out; | |
822 | } | |
823 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 824 | flags, holder, fs_devices); |
83c8c9bd | 825 | kfree(device_name); |
43e570b0 | 826 | if (error) |
830c4adb | 827 | goto out; |
43e570b0 | 828 | break; |
edf24abe CH |
829 | default: |
830 | break; | |
831 | } | |
832 | } | |
833 | ||
830c4adb | 834 | out: |
3f3d0bc0 | 835 | kfree(orig); |
edf24abe | 836 | return error; |
95e05289 CM |
837 | } |
838 | ||
05dbe683 OS |
839 | static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, |
840 | u64 subvol_objectid) | |
73f73415 | 841 | { |
815745cf | 842 | struct btrfs_root *root = fs_info->tree_root; |
05dbe683 OS |
843 | struct btrfs_root *fs_root; |
844 | struct btrfs_root_ref *root_ref; | |
845 | struct btrfs_inode_ref *inode_ref; | |
846 | struct btrfs_key key; | |
847 | struct btrfs_path *path = NULL; | |
848 | char *name = NULL, *ptr; | |
849 | u64 dirid; | |
850 | int len; | |
851 | int ret; | |
852 | ||
853 | path = btrfs_alloc_path(); | |
854 | if (!path) { | |
855 | ret = -ENOMEM; | |
856 | goto err; | |
857 | } | |
858 | path->leave_spinning = 1; | |
859 | ||
860 | name = kmalloc(PATH_MAX, GFP_NOFS); | |
861 | if (!name) { | |
862 | ret = -ENOMEM; | |
863 | goto err; | |
864 | } | |
865 | ptr = name + PATH_MAX - 1; | |
866 | ptr[0] = '\0'; | |
73f73415 JB |
867 | |
868 | /* | |
05dbe683 OS |
869 | * Walk up the subvolume trees in the tree of tree roots by root |
870 | * backrefs until we hit the top-level subvolume. | |
73f73415 | 871 | */ |
05dbe683 OS |
872 | while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
873 | key.objectid = subvol_objectid; | |
874 | key.type = BTRFS_ROOT_BACKREF_KEY; | |
875 | key.offset = (u64)-1; | |
876 | ||
877 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
878 | if (ret < 0) { | |
879 | goto err; | |
880 | } else if (ret > 0) { | |
881 | ret = btrfs_previous_item(root, path, subvol_objectid, | |
882 | BTRFS_ROOT_BACKREF_KEY); | |
883 | if (ret < 0) { | |
884 | goto err; | |
885 | } else if (ret > 0) { | |
886 | ret = -ENOENT; | |
887 | goto err; | |
888 | } | |
889 | } | |
890 | ||
891 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
892 | subvol_objectid = key.offset; | |
893 | ||
894 | root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
895 | struct btrfs_root_ref); | |
896 | len = btrfs_root_ref_name_len(path->nodes[0], root_ref); | |
897 | ptr -= len + 1; | |
898 | if (ptr < name) { | |
899 | ret = -ENAMETOOLONG; | |
900 | goto err; | |
901 | } | |
902 | read_extent_buffer(path->nodes[0], ptr + 1, | |
903 | (unsigned long)(root_ref + 1), len); | |
904 | ptr[0] = '/'; | |
905 | dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); | |
906 | btrfs_release_path(path); | |
907 | ||
908 | key.objectid = subvol_objectid; | |
909 | key.type = BTRFS_ROOT_ITEM_KEY; | |
910 | key.offset = (u64)-1; | |
911 | fs_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
912 | if (IS_ERR(fs_root)) { | |
913 | ret = PTR_ERR(fs_root); | |
914 | goto err; | |
915 | } | |
916 | ||
917 | /* | |
918 | * Walk up the filesystem tree by inode refs until we hit the | |
919 | * root directory. | |
920 | */ | |
921 | while (dirid != BTRFS_FIRST_FREE_OBJECTID) { | |
922 | key.objectid = dirid; | |
923 | key.type = BTRFS_INODE_REF_KEY; | |
924 | key.offset = (u64)-1; | |
925 | ||
926 | ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); | |
927 | if (ret < 0) { | |
928 | goto err; | |
929 | } else if (ret > 0) { | |
930 | ret = btrfs_previous_item(fs_root, path, dirid, | |
931 | BTRFS_INODE_REF_KEY); | |
932 | if (ret < 0) { | |
933 | goto err; | |
934 | } else if (ret > 0) { | |
935 | ret = -ENOENT; | |
936 | goto err; | |
937 | } | |
938 | } | |
939 | ||
940 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
941 | dirid = key.offset; | |
942 | ||
943 | inode_ref = btrfs_item_ptr(path->nodes[0], | |
944 | path->slots[0], | |
945 | struct btrfs_inode_ref); | |
946 | len = btrfs_inode_ref_name_len(path->nodes[0], | |
947 | inode_ref); | |
948 | ptr -= len + 1; | |
949 | if (ptr < name) { | |
950 | ret = -ENAMETOOLONG; | |
951 | goto err; | |
952 | } | |
953 | read_extent_buffer(path->nodes[0], ptr + 1, | |
954 | (unsigned long)(inode_ref + 1), len); | |
955 | ptr[0] = '/'; | |
956 | btrfs_release_path(path); | |
957 | } | |
73f73415 JB |
958 | } |
959 | ||
05dbe683 OS |
960 | btrfs_free_path(path); |
961 | if (ptr == name + PATH_MAX - 1) { | |
962 | name[0] = '/'; | |
963 | name[1] = '\0'; | |
964 | } else { | |
965 | memmove(name, ptr, name + PATH_MAX - ptr); | |
966 | } | |
967 | return name; | |
968 | ||
969 | err: | |
970 | btrfs_free_path(path); | |
971 | kfree(name); | |
972 | return ERR_PTR(ret); | |
973 | } | |
974 | ||
975 | static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) | |
976 | { | |
977 | struct btrfs_root *root = fs_info->tree_root; | |
978 | struct btrfs_dir_item *di; | |
979 | struct btrfs_path *path; | |
980 | struct btrfs_key location; | |
981 | u64 dir_id; | |
982 | ||
73f73415 JB |
983 | path = btrfs_alloc_path(); |
984 | if (!path) | |
05dbe683 | 985 | return -ENOMEM; |
73f73415 JB |
986 | path->leave_spinning = 1; |
987 | ||
988 | /* | |
989 | * Find the "default" dir item which points to the root item that we | |
990 | * will mount by default if we haven't been given a specific subvolume | |
991 | * to mount. | |
992 | */ | |
815745cf | 993 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 994 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
995 | if (IS_ERR(di)) { |
996 | btrfs_free_path(path); | |
05dbe683 | 997 | return PTR_ERR(di); |
b0839166 | 998 | } |
73f73415 JB |
999 | if (!di) { |
1000 | /* | |
1001 | * Ok the default dir item isn't there. This is weird since | |
1002 | * it's always been there, but don't freak out, just try and | |
05dbe683 | 1003 | * mount the top-level subvolume. |
73f73415 JB |
1004 | */ |
1005 | btrfs_free_path(path); | |
05dbe683 OS |
1006 | *objectid = BTRFS_FS_TREE_OBJECTID; |
1007 | return 0; | |
73f73415 JB |
1008 | } |
1009 | ||
1010 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
1011 | btrfs_free_path(path); | |
05dbe683 OS |
1012 | *objectid = location.objectid; |
1013 | return 0; | |
73f73415 JB |
1014 | } |
1015 | ||
d397712b | 1016 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 1017 | struct btrfs_fs_devices *fs_devices, |
d397712b | 1018 | void *data, int silent) |
75dfe396 | 1019 | { |
d397712b | 1020 | struct inode *inode; |
815745cf | 1021 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 1022 | struct btrfs_key key; |
39279cc3 | 1023 | int err; |
a429e513 | 1024 | |
39279cc3 CM |
1025 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
1026 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
1027 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 1028 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 1029 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 1030 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 1031 | sb->s_time_gran = 1; |
0eda294d | 1032 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 1033 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 1034 | #endif |
0c4d2d95 | 1035 | sb->s_flags |= MS_I_VERSION; |
ad2b2c80 AV |
1036 | err = open_ctree(sb, fs_devices, (char *)data); |
1037 | if (err) { | |
efe120a0 | 1038 | printk(KERN_ERR "BTRFS: open_ctree failed\n"); |
ad2b2c80 | 1039 | return err; |
a429e513 CM |
1040 | } |
1041 | ||
5d4f98a2 YZ |
1042 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
1043 | key.type = BTRFS_INODE_ITEM_KEY; | |
1044 | key.offset = 0; | |
98c7089c | 1045 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
1046 | if (IS_ERR(inode)) { |
1047 | err = PTR_ERR(inode); | |
39279cc3 | 1048 | goto fail_close; |
f254e52c | 1049 | } |
f254e52c | 1050 | |
48fde701 AV |
1051 | sb->s_root = d_make_root(inode); |
1052 | if (!sb->s_root) { | |
39279cc3 CM |
1053 | err = -ENOMEM; |
1054 | goto fail_close; | |
f254e52c | 1055 | } |
58176a96 | 1056 | |
6885f308 | 1057 | save_mount_options(sb, data); |
90a887c9 | 1058 | cleancache_init_fs(sb); |
59553edf | 1059 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 1060 | return 0; |
39279cc3 CM |
1061 | |
1062 | fail_close: | |
815745cf | 1063 | close_ctree(fs_info->tree_root); |
39279cc3 | 1064 | return err; |
2619ba1f CM |
1065 | } |
1066 | ||
6bf13c0c | 1067 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
1068 | { |
1069 | struct btrfs_trans_handle *trans; | |
815745cf AV |
1070 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1071 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 1072 | |
1abe9b8a | 1073 | trace_btrfs_sync_fs(wait); |
1074 | ||
39279cc3 | 1075 | if (!wait) { |
815745cf | 1076 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
1077 | return 0; |
1078 | } | |
771ed689 | 1079 | |
b0244199 | 1080 | btrfs_wait_ordered_roots(fs_info, -1); |
771ed689 | 1081 | |
d4edf39b | 1082 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 1083 | if (IS_ERR(trans)) { |
354aa0fb | 1084 | /* no transaction, don't bother */ |
6b5fe46d DS |
1085 | if (PTR_ERR(trans) == -ENOENT) { |
1086 | /* | |
1087 | * Exit unless we have some pending changes | |
1088 | * that need to go through commit | |
1089 | */ | |
1090 | if (fs_info->pending_changes == 0) | |
1091 | return 0; | |
a53f4f8e QW |
1092 | /* |
1093 | * A non-blocking test if the fs is frozen. We must not | |
1094 | * start a new transaction here otherwise a deadlock | |
1095 | * happens. The pending operations are delayed to the | |
1096 | * next commit after thawing. | |
1097 | */ | |
1098 | if (__sb_start_write(sb, SB_FREEZE_WRITE, false)) | |
1099 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1100 | else | |
1101 | return 0; | |
6b5fe46d | 1102 | trans = btrfs_start_transaction(root, 0); |
6b5fe46d | 1103 | } |
98bd5c54 DS |
1104 | if (IS_ERR(trans)) |
1105 | return PTR_ERR(trans); | |
60376ce4 | 1106 | } |
bd7de2c9 | 1107 | return btrfs_commit_transaction(trans, root); |
2c90e5d6 CM |
1108 | } |
1109 | ||
34c80b1d | 1110 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 1111 | { |
815745cf AV |
1112 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
1113 | struct btrfs_root *root = info->tree_root; | |
200da64e | 1114 | char *compress_type; |
a9572a15 EP |
1115 | |
1116 | if (btrfs_test_opt(root, DEGRADED)) | |
1117 | seq_puts(seq, ",degraded"); | |
1118 | if (btrfs_test_opt(root, NODATASUM)) | |
1119 | seq_puts(seq, ",nodatasum"); | |
1120 | if (btrfs_test_opt(root, NODATACOW)) | |
1121 | seq_puts(seq, ",nodatacow"); | |
1122 | if (btrfs_test_opt(root, NOBARRIER)) | |
1123 | seq_puts(seq, ",nobarrier"); | |
95ac567a | 1124 | if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) |
c1c9ff7c | 1125 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
a9572a15 | 1126 | if (info->alloc_start != 0) |
c1c9ff7c | 1127 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); |
a9572a15 EP |
1128 | if (info->thread_pool_size != min_t(unsigned long, |
1129 | num_online_cpus() + 2, 8)) | |
1130 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
200da64e TI |
1131 | if (btrfs_test_opt(root, COMPRESS)) { |
1132 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) | |
1133 | compress_type = "zlib"; | |
1134 | else | |
1135 | compress_type = "lzo"; | |
1136 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
1137 | seq_printf(seq, ",compress-force=%s", compress_type); | |
1138 | else | |
1139 | seq_printf(seq, ",compress=%s", compress_type); | |
1140 | } | |
c289811c CM |
1141 | if (btrfs_test_opt(root, NOSSD)) |
1142 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
1143 | if (btrfs_test_opt(root, SSD_SPREAD)) |
1144 | seq_puts(seq, ",ssd_spread"); | |
1145 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 1146 | seq_puts(seq, ",ssd"); |
3a5e1404 | 1147 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 1148 | seq_puts(seq, ",notreelog"); |
dccae999 | 1149 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 1150 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
1151 | if (btrfs_test_opt(root, DISCARD)) |
1152 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
1153 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
1154 | seq_puts(seq, ",noacl"); | |
200da64e TI |
1155 | if (btrfs_test_opt(root, SPACE_CACHE)) |
1156 | seq_puts(seq, ",space_cache"); | |
73bc1876 | 1157 | else |
8965593e | 1158 | seq_puts(seq, ",nospace_cache"); |
f420ee1e SB |
1159 | if (btrfs_test_opt(root, RESCAN_UUID_TREE)) |
1160 | seq_puts(seq, ",rescan_uuid_tree"); | |
200da64e TI |
1161 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
1162 | seq_puts(seq, ",clear_cache"); | |
1163 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
1164 | seq_puts(seq, ",user_subvol_rm_allowed"); | |
0942caa3 DS |
1165 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
1166 | seq_puts(seq, ",enospc_debug"); | |
1167 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
1168 | seq_puts(seq, ",autodefrag"); | |
1169 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) | |
1170 | seq_puts(seq, ",inode_cache"); | |
9555c6c1 ID |
1171 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
1172 | seq_puts(seq, ",skip_balance"); | |
8507d216 WS |
1173 | if (btrfs_test_opt(root, RECOVERY)) |
1174 | seq_puts(seq, ",recovery"); | |
1175 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
1176 | if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) | |
1177 | seq_puts(seq, ",check_int_data"); | |
1178 | else if (btrfs_test_opt(root, CHECK_INTEGRITY)) | |
1179 | seq_puts(seq, ",check_int"); | |
1180 | if (info->check_integrity_print_mask) | |
1181 | seq_printf(seq, ",check_int_print_mask=%d", | |
1182 | info->check_integrity_print_mask); | |
1183 | #endif | |
1184 | if (info->metadata_ratio) | |
1185 | seq_printf(seq, ",metadata_ratio=%d", | |
1186 | info->metadata_ratio); | |
8c342930 JM |
1187 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
1188 | seq_puts(seq, ",fatal_errors=panic"); | |
8b87dc17 DS |
1189 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
1190 | seq_printf(seq, ",commit=%d", info->commit_interval); | |
c8d3fe02 OS |
1191 | seq_printf(seq, ",subvolid=%llu", |
1192 | BTRFS_I(d_inode(dentry))->root->root_key.objectid); | |
1193 | seq_puts(seq, ",subvol="); | |
1194 | seq_dentry(seq, dentry, " \t\n\\"); | |
a9572a15 EP |
1195 | return 0; |
1196 | } | |
1197 | ||
a061fc8d | 1198 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 1199 | { |
815745cf AV |
1200 | struct btrfs_fs_info *p = data; |
1201 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 1202 | |
815745cf | 1203 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
1204 | } |
1205 | ||
450ba0ea JB |
1206 | static int btrfs_set_super(struct super_block *s, void *data) |
1207 | { | |
6de1d09d AV |
1208 | int err = set_anon_super(s, data); |
1209 | if (!err) | |
1210 | s->s_fs_info = data; | |
1211 | return err; | |
4b82d6e4 Y |
1212 | } |
1213 | ||
f9d9ef62 DS |
1214 | /* |
1215 | * subvolumes are identified by ino 256 | |
1216 | */ | |
1217 | static inline int is_subvolume_inode(struct inode *inode) | |
1218 | { | |
1219 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1220 | return 1; | |
1221 | return 0; | |
1222 | } | |
1223 | ||
830c4adb | 1224 | /* |
e6e4dbe8 OS |
1225 | * This will add subvolid=0 to the argument string while removing any subvol= |
1226 | * and subvolid= arguments to make sure we get the top-level root for path | |
1227 | * walking to the subvol we want. | |
830c4adb JB |
1228 | */ |
1229 | static char *setup_root_args(char *args) | |
1230 | { | |
e6e4dbe8 | 1231 | char *buf, *dst, *sep; |
830c4adb | 1232 | |
e6e4dbe8 OS |
1233 | if (!args) |
1234 | return kstrdup("subvolid=0", GFP_NOFS); | |
f60d16a8 | 1235 | |
e6e4dbe8 OS |
1236 | /* The worst case is that we add ",subvolid=0" to the end. */ |
1237 | buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS); | |
f60d16a8 | 1238 | if (!buf) |
830c4adb | 1239 | return NULL; |
830c4adb | 1240 | |
e6e4dbe8 OS |
1241 | while (1) { |
1242 | sep = strchrnul(args, ','); | |
1243 | if (!strstarts(args, "subvol=") && | |
1244 | !strstarts(args, "subvolid=")) { | |
1245 | memcpy(dst, args, sep - args); | |
1246 | dst += sep - args; | |
1247 | *dst++ = ','; | |
1248 | } | |
1249 | if (*sep) | |
1250 | args = sep + 1; | |
1251 | else | |
1252 | break; | |
830c4adb | 1253 | } |
f60d16a8 | 1254 | strcpy(dst, "subvolid=0"); |
830c4adb | 1255 | |
f60d16a8 | 1256 | return buf; |
830c4adb JB |
1257 | } |
1258 | ||
bb289b7b OS |
1259 | static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, |
1260 | int flags, const char *device_name, | |
1261 | char *data) | |
830c4adb | 1262 | { |
830c4adb | 1263 | struct dentry *root; |
fa330659 | 1264 | struct vfsmount *mnt = NULL; |
830c4adb | 1265 | char *newargs; |
fa330659 | 1266 | int ret; |
830c4adb JB |
1267 | |
1268 | newargs = setup_root_args(data); | |
fa330659 OS |
1269 | if (!newargs) { |
1270 | root = ERR_PTR(-ENOMEM); | |
1271 | goto out; | |
1272 | } | |
0723a047 | 1273 | |
fa330659 OS |
1274 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); |
1275 | if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { | |
0723a047 | 1276 | if (flags & MS_RDONLY) { |
fa330659 OS |
1277 | mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, |
1278 | device_name, newargs); | |
0723a047 | 1279 | } else { |
fa330659 OS |
1280 | mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, |
1281 | device_name, newargs); | |
0040e606 | 1282 | if (IS_ERR(mnt)) { |
fa330659 OS |
1283 | root = ERR_CAST(mnt); |
1284 | mnt = NULL; | |
1285 | goto out; | |
0040e606 | 1286 | } |
0723a047 | 1287 | |
773cd04e | 1288 | down_write(&mnt->mnt_sb->s_umount); |
fa330659 | 1289 | ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); |
773cd04e | 1290 | up_write(&mnt->mnt_sb->s_umount); |
fa330659 OS |
1291 | if (ret < 0) { |
1292 | root = ERR_PTR(ret); | |
1293 | goto out; | |
0723a047 HH |
1294 | } |
1295 | } | |
1296 | } | |
fa330659 OS |
1297 | if (IS_ERR(mnt)) { |
1298 | root = ERR_CAST(mnt); | |
1299 | mnt = NULL; | |
1300 | goto out; | |
1301 | } | |
830c4adb | 1302 | |
05dbe683 OS |
1303 | if (!subvol_name) { |
1304 | if (!subvol_objectid) { | |
1305 | ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), | |
1306 | &subvol_objectid); | |
1307 | if (ret) { | |
1308 | root = ERR_PTR(ret); | |
1309 | goto out; | |
1310 | } | |
1311 | } | |
1312 | subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), | |
1313 | subvol_objectid); | |
1314 | if (IS_ERR(subvol_name)) { | |
1315 | root = ERR_CAST(subvol_name); | |
1316 | subvol_name = NULL; | |
1317 | goto out; | |
1318 | } | |
1319 | ||
1320 | } | |
1321 | ||
ea441d11 | 1322 | root = mount_subtree(mnt, subvol_name); |
fa330659 OS |
1323 | /* mount_subtree() drops our reference on the vfsmount. */ |
1324 | mnt = NULL; | |
830c4adb | 1325 | |
bb289b7b | 1326 | if (!IS_ERR(root)) { |
ea441d11 | 1327 | struct super_block *s = root->d_sb; |
bb289b7b OS |
1328 | struct inode *root_inode = d_inode(root); |
1329 | u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; | |
1330 | ||
1331 | ret = 0; | |
1332 | if (!is_subvolume_inode(root_inode)) { | |
1333 | pr_err("BTRFS: '%s' is not a valid subvolume\n", | |
1334 | subvol_name); | |
1335 | ret = -EINVAL; | |
1336 | } | |
1337 | if (subvol_objectid && root_objectid != subvol_objectid) { | |
05dbe683 OS |
1338 | /* |
1339 | * This will also catch a race condition where a | |
1340 | * subvolume which was passed by ID is renamed and | |
1341 | * another subvolume is renamed over the old location. | |
1342 | */ | |
bb289b7b OS |
1343 | pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n", |
1344 | subvol_name, subvol_objectid); | |
1345 | ret = -EINVAL; | |
1346 | } | |
1347 | if (ret) { | |
1348 | dput(root); | |
1349 | root = ERR_PTR(ret); | |
1350 | deactivate_locked_super(s); | |
1351 | } | |
f9d9ef62 DS |
1352 | } |
1353 | ||
fa330659 OS |
1354 | out: |
1355 | mntput(mnt); | |
1356 | kfree(newargs); | |
1357 | kfree(subvol_name); | |
830c4adb JB |
1358 | return root; |
1359 | } | |
450ba0ea | 1360 | |
f667aef6 QW |
1361 | static int parse_security_options(char *orig_opts, |
1362 | struct security_mnt_opts *sec_opts) | |
1363 | { | |
1364 | char *secdata = NULL; | |
1365 | int ret = 0; | |
1366 | ||
1367 | secdata = alloc_secdata(); | |
1368 | if (!secdata) | |
1369 | return -ENOMEM; | |
1370 | ret = security_sb_copy_data(orig_opts, secdata); | |
1371 | if (ret) { | |
1372 | free_secdata(secdata); | |
1373 | return ret; | |
1374 | } | |
1375 | ret = security_sb_parse_opts_str(secdata, sec_opts); | |
1376 | free_secdata(secdata); | |
1377 | return ret; | |
1378 | } | |
1379 | ||
1380 | static int setup_security_options(struct btrfs_fs_info *fs_info, | |
1381 | struct super_block *sb, | |
1382 | struct security_mnt_opts *sec_opts) | |
1383 | { | |
1384 | int ret = 0; | |
1385 | ||
1386 | /* | |
1387 | * Call security_sb_set_mnt_opts() to check whether new sec_opts | |
1388 | * is valid. | |
1389 | */ | |
1390 | ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); | |
1391 | if (ret) | |
1392 | return ret; | |
1393 | ||
a43bb39b | 1394 | #ifdef CONFIG_SECURITY |
f667aef6 QW |
1395 | if (!fs_info->security_opts.num_mnt_opts) { |
1396 | /* first time security setup, copy sec_opts to fs_info */ | |
1397 | memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); | |
1398 | } else { | |
1399 | /* | |
1400 | * Since SELinux(the only one supports security_mnt_opts) does | |
1401 | * NOT support changing context during remount/mount same sb, | |
1402 | * This must be the same or part of the same security options, | |
1403 | * just free it. | |
1404 | */ | |
1405 | security_free_mnt_opts(sec_opts); | |
1406 | } | |
a43bb39b | 1407 | #endif |
f667aef6 QW |
1408 | return ret; |
1409 | } | |
1410 | ||
edf24abe CH |
1411 | /* |
1412 | * Find a superblock for the given device / mount point. | |
1413 | * | |
1414 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1415 | * for multiple device setup. Make sure to keep it in sync. | |
1416 | */ | |
061dbc6b | 1417 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1418 | const char *device_name, void *data) |
4b82d6e4 Y |
1419 | { |
1420 | struct block_device *bdev = NULL; | |
1421 | struct super_block *s; | |
8a4b83cc | 1422 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 1423 | struct btrfs_fs_info *fs_info = NULL; |
f667aef6 | 1424 | struct security_mnt_opts new_sec_opts; |
97288f2c | 1425 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1426 | char *subvol_name = NULL; |
1427 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
1428 | int error = 0; |
1429 | ||
97288f2c CH |
1430 | if (!(flags & MS_RDONLY)) |
1431 | mode |= FMODE_WRITE; | |
1432 | ||
1433 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 1434 | &subvol_name, &subvol_objectid, |
5e2a4b25 | 1435 | &fs_devices); |
f23c8af8 ID |
1436 | if (error) { |
1437 | kfree(subvol_name); | |
061dbc6b | 1438 | return ERR_PTR(error); |
f23c8af8 | 1439 | } |
edf24abe | 1440 | |
05dbe683 | 1441 | if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
fa330659 | 1442 | /* mount_subvol() will free subvol_name. */ |
bb289b7b OS |
1443 | return mount_subvol(subvol_name, subvol_objectid, flags, |
1444 | device_name, data); | |
830c4adb JB |
1445 | } |
1446 | ||
f667aef6 QW |
1447 | security_init_mnt_opts(&new_sec_opts); |
1448 | if (data) { | |
1449 | error = parse_security_options(data, &new_sec_opts); | |
1450 | if (error) | |
1451 | return ERR_PTR(error); | |
1452 | } | |
1453 | ||
306e16ce | 1454 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 1455 | if (error) |
f667aef6 | 1456 | goto error_sec_opts; |
4b82d6e4 | 1457 | |
450ba0ea JB |
1458 | /* |
1459 | * Setup a dummy root and fs_info for test/set super. This is because | |
1460 | * we don't actually fill this stuff out until open_ctree, but we need | |
1461 | * it for searching for existing supers, so this lets us do that and | |
1462 | * then open_ctree will properly initialize everything later. | |
1463 | */ | |
1464 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
f667aef6 QW |
1465 | if (!fs_info) { |
1466 | error = -ENOMEM; | |
1467 | goto error_sec_opts; | |
1468 | } | |
04d21a24 | 1469 | |
450ba0ea | 1470 | fs_info->fs_devices = fs_devices; |
450ba0ea | 1471 | |
6c41761f DS |
1472 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
1473 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
f667aef6 | 1474 | security_init_mnt_opts(&fs_info->security_opts); |
6c41761f DS |
1475 | if (!fs_info->super_copy || !fs_info->super_for_commit) { |
1476 | error = -ENOMEM; | |
04d21a24 ID |
1477 | goto error_fs_info; |
1478 | } | |
1479 | ||
1480 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1481 | if (error) | |
1482 | goto error_fs_info; | |
1483 | ||
1484 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1485 | error = -EACCES; | |
6c41761f DS |
1486 | goto error_close_devices; |
1487 | } | |
1488 | ||
dfe25020 | 1489 | bdev = fs_devices->latest_bdev; |
9249e17f DH |
1490 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
1491 | fs_info); | |
830c4adb JB |
1492 | if (IS_ERR(s)) { |
1493 | error = PTR_ERR(s); | |
1494 | goto error_close_devices; | |
1495 | } | |
4b82d6e4 Y |
1496 | |
1497 | if (s->s_root) { | |
2b82032c | 1498 | btrfs_close_devices(fs_devices); |
6c41761f | 1499 | free_fs_info(fs_info); |
59553edf AV |
1500 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1501 | error = -EBUSY; | |
4b82d6e4 Y |
1502 | } else { |
1503 | char b[BDEVNAME_SIZE]; | |
1504 | ||
4b82d6e4 | 1505 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
815745cf | 1506 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1507 | error = btrfs_fill_super(s, fs_devices, data, |
1508 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 1509 | } |
05dbe683 | 1510 | if (error) { |
f667aef6 | 1511 | deactivate_locked_super(s); |
f667aef6 QW |
1512 | goto error_sec_opts; |
1513 | } | |
1514 | ||
1515 | fs_info = btrfs_sb(s); | |
1516 | error = setup_security_options(fs_info, s, &new_sec_opts); | |
1517 | if (error) { | |
830c4adb | 1518 | deactivate_locked_super(s); |
f667aef6 QW |
1519 | goto error_sec_opts; |
1520 | } | |
4b82d6e4 | 1521 | |
05dbe683 | 1522 | return dget(s->s_root); |
4b82d6e4 | 1523 | |
c146afad | 1524 | error_close_devices: |
8a4b83cc | 1525 | btrfs_close_devices(fs_devices); |
04d21a24 | 1526 | error_fs_info: |
6c41761f | 1527 | free_fs_info(fs_info); |
f667aef6 QW |
1528 | error_sec_opts: |
1529 | security_free_mnt_opts(&new_sec_opts); | |
061dbc6b | 1530 | return ERR_PTR(error); |
4b82d6e4 | 1531 | } |
2e635a27 | 1532 | |
0d2450ab ST |
1533 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
1534 | int new_pool_size, int old_pool_size) | |
1535 | { | |
1536 | if (new_pool_size == old_pool_size) | |
1537 | return; | |
1538 | ||
1539 | fs_info->thread_pool_size = new_pool_size; | |
1540 | ||
efe120a0 | 1541 | btrfs_info(fs_info, "resize thread pool %d -> %d", |
0d2450ab ST |
1542 | old_pool_size, new_pool_size); |
1543 | ||
5cdc7ad3 | 1544 | btrfs_workqueue_set_max(fs_info->workers, new_pool_size); |
afe3d242 | 1545 | btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); |
a8c93d4e | 1546 | btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); |
e66f0bb1 | 1547 | btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); |
fccb5d86 QW |
1548 | btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); |
1549 | btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); | |
1550 | btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, | |
1551 | new_pool_size); | |
1552 | btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); | |
1553 | btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); | |
5b3bc44e | 1554 | btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); |
736cfa15 | 1555 | btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); |
0339ef2f QW |
1556 | btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, |
1557 | new_pool_size); | |
0d2450ab ST |
1558 | } |
1559 | ||
f42a34b2 | 1560 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
dc81cdc5 MX |
1561 | { |
1562 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
f42a34b2 | 1563 | } |
dc81cdc5 | 1564 | |
f42a34b2 MX |
1565 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
1566 | unsigned long old_opts, int flags) | |
1567 | { | |
dc81cdc5 MX |
1568 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1569 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1570 | (flags & MS_RDONLY))) { | |
1571 | /* wait for any defraggers to finish */ | |
1572 | wait_event(fs_info->transaction_wait, | |
1573 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1574 | if (flags & MS_RDONLY) | |
1575 | sync_filesystem(fs_info->sb); | |
1576 | } | |
1577 | } | |
1578 | ||
1579 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1580 | unsigned long old_opts) | |
1581 | { | |
1582 | /* | |
1583 | * We need cleanup all defragable inodes if the autodefragment is | |
1584 | * close or the fs is R/O. | |
1585 | */ | |
1586 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1587 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1588 | (fs_info->sb->s_flags & MS_RDONLY))) { | |
1589 | btrfs_cleanup_defrag_inodes(fs_info); | |
1590 | } | |
1591 | ||
1592 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1593 | } | |
1594 | ||
c146afad YZ |
1595 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1596 | { | |
815745cf AV |
1597 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1598 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1599 | unsigned old_flags = sb->s_flags; |
1600 | unsigned long old_opts = fs_info->mount_opt; | |
1601 | unsigned long old_compress_type = fs_info->compress_type; | |
1602 | u64 old_max_inline = fs_info->max_inline; | |
1603 | u64 old_alloc_start = fs_info->alloc_start; | |
1604 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1605 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
c146afad YZ |
1606 | int ret; |
1607 | ||
02b9984d | 1608 | sync_filesystem(sb); |
f42a34b2 | 1609 | btrfs_remount_prepare(fs_info); |
dc81cdc5 | 1610 | |
f667aef6 QW |
1611 | if (data) { |
1612 | struct security_mnt_opts new_sec_opts; | |
1613 | ||
1614 | security_init_mnt_opts(&new_sec_opts); | |
1615 | ret = parse_security_options(data, &new_sec_opts); | |
1616 | if (ret) | |
1617 | goto restore; | |
1618 | ret = setup_security_options(fs_info, sb, | |
1619 | &new_sec_opts); | |
1620 | if (ret) { | |
1621 | security_free_mnt_opts(&new_sec_opts); | |
1622 | goto restore; | |
1623 | } | |
1624 | } | |
1625 | ||
b288052e | 1626 | ret = btrfs_parse_options(root, data); |
49b25e05 JM |
1627 | if (ret) { |
1628 | ret = -EINVAL; | |
1629 | goto restore; | |
1630 | } | |
b288052e | 1631 | |
f42a34b2 | 1632 | btrfs_remount_begin(fs_info, old_opts, *flags); |
0d2450ab ST |
1633 | btrfs_resize_thread_pool(fs_info, |
1634 | fs_info->thread_pool_size, old_thread_pool_size); | |
1635 | ||
c146afad | 1636 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
dc81cdc5 | 1637 | goto out; |
c146afad YZ |
1638 | |
1639 | if (*flags & MS_RDONLY) { | |
8dabb742 SB |
1640 | /* |
1641 | * this also happens on 'umount -rf' or on shutdown, when | |
1642 | * the filesystem is busy. | |
1643 | */ | |
21c7e756 | 1644 | cancel_work_sync(&fs_info->async_reclaim_work); |
361c093d SB |
1645 | |
1646 | /* wait for the uuid_scan task to finish */ | |
1647 | down(&fs_info->uuid_tree_rescan_sem); | |
1648 | /* avoid complains from lockdep et al. */ | |
1649 | up(&fs_info->uuid_tree_rescan_sem); | |
1650 | ||
c146afad YZ |
1651 | sb->s_flags |= MS_RDONLY; |
1652 | ||
8dabb742 SB |
1653 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1654 | btrfs_scrub_cancel(fs_info); | |
061594ef | 1655 | btrfs_pause_balance(fs_info); |
8dabb742 | 1656 | |
49b25e05 JM |
1657 | ret = btrfs_commit_super(root); |
1658 | if (ret) | |
1659 | goto restore; | |
c146afad | 1660 | } else { |
6ef3de9c DS |
1661 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
1662 | btrfs_err(fs_info, | |
efe120a0 | 1663 | "Remounting read-write after error is not allowed"); |
6ef3de9c DS |
1664 | ret = -EINVAL; |
1665 | goto restore; | |
1666 | } | |
8a3db184 | 1667 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1668 | ret = -EACCES; |
1669 | goto restore; | |
8a3db184 | 1670 | } |
2b82032c | 1671 | |
292fd7fc SB |
1672 | if (fs_info->fs_devices->missing_devices > |
1673 | fs_info->num_tolerated_disk_barrier_failures && | |
1674 | !(*flags & MS_RDONLY)) { | |
efe120a0 FH |
1675 | btrfs_warn(fs_info, |
1676 | "too many missing devices, writeable remount is not allowed"); | |
292fd7fc SB |
1677 | ret = -EACCES; |
1678 | goto restore; | |
1679 | } | |
1680 | ||
8a3db184 | 1681 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1682 | ret = -EINVAL; |
1683 | goto restore; | |
8a3db184 | 1684 | } |
c146afad | 1685 | |
815745cf | 1686 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1687 | if (ret) |
1688 | goto restore; | |
c146afad | 1689 | |
d68fc57b | 1690 | /* recover relocation */ |
5f316481 | 1691 | mutex_lock(&fs_info->cleaner_mutex); |
d68fc57b | 1692 | ret = btrfs_recover_relocation(root); |
5f316481 | 1693 | mutex_unlock(&fs_info->cleaner_mutex); |
49b25e05 JM |
1694 | if (ret) |
1695 | goto restore; | |
c146afad | 1696 | |
2b6ba629 ID |
1697 | ret = btrfs_resume_balance_async(fs_info); |
1698 | if (ret) | |
1699 | goto restore; | |
1700 | ||
8dabb742 SB |
1701 | ret = btrfs_resume_dev_replace_async(fs_info); |
1702 | if (ret) { | |
efe120a0 | 1703 | btrfs_warn(fs_info, "failed to resume dev_replace"); |
8dabb742 SB |
1704 | goto restore; |
1705 | } | |
94aebfb2 JB |
1706 | |
1707 | if (!fs_info->uuid_root) { | |
efe120a0 | 1708 | btrfs_info(fs_info, "creating UUID tree"); |
94aebfb2 JB |
1709 | ret = btrfs_create_uuid_tree(fs_info); |
1710 | if (ret) { | |
efe120a0 | 1711 | btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); |
94aebfb2 JB |
1712 | goto restore; |
1713 | } | |
1714 | } | |
c146afad YZ |
1715 | sb->s_flags &= ~MS_RDONLY; |
1716 | } | |
dc81cdc5 | 1717 | out: |
2c6a92b0 | 1718 | wake_up_process(fs_info->transaction_kthread); |
dc81cdc5 | 1719 | btrfs_remount_cleanup(fs_info, old_opts); |
c146afad | 1720 | return 0; |
49b25e05 JM |
1721 | |
1722 | restore: | |
1723 | /* We've hit an error - don't reset MS_RDONLY */ | |
1724 | if (sb->s_flags & MS_RDONLY) | |
1725 | old_flags |= MS_RDONLY; | |
1726 | sb->s_flags = old_flags; | |
1727 | fs_info->mount_opt = old_opts; | |
1728 | fs_info->compress_type = old_compress_type; | |
1729 | fs_info->max_inline = old_max_inline; | |
c018daec | 1730 | mutex_lock(&fs_info->chunk_mutex); |
49b25e05 | 1731 | fs_info->alloc_start = old_alloc_start; |
c018daec | 1732 | mutex_unlock(&fs_info->chunk_mutex); |
0d2450ab ST |
1733 | btrfs_resize_thread_pool(fs_info, |
1734 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 | 1735 | fs_info->metadata_ratio = old_metadata_ratio; |
dc81cdc5 | 1736 | btrfs_remount_cleanup(fs_info, old_opts); |
49b25e05 | 1737 | return ret; |
c146afad YZ |
1738 | } |
1739 | ||
bcd53741 AJ |
1740 | /* Used to sort the devices by max_avail(descending sort) */ |
1741 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1742 | const void *dev_info2) | |
1743 | { | |
1744 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1745 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1746 | return -1; | |
1747 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1748 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1749 | return 1; | |
1750 | else | |
1751 | return 0; | |
1752 | } | |
1753 | ||
1754 | /* | |
1755 | * sort the devices by max_avail, in which max free extent size of each device | |
1756 | * is stored.(Descending Sort) | |
1757 | */ | |
1758 | static inline void btrfs_descending_sort_devices( | |
1759 | struct btrfs_device_info *devices, | |
1760 | size_t nr_devices) | |
1761 | { | |
1762 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1763 | btrfs_cmp_device_free_bytes, NULL); | |
1764 | } | |
1765 | ||
6d07bcec MX |
1766 | /* |
1767 | * The helper to calc the free space on the devices that can be used to store | |
1768 | * file data. | |
1769 | */ | |
1770 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1771 | { | |
1772 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1773 | struct btrfs_device_info *devices_info; | |
1774 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1775 | struct btrfs_device *device; | |
1776 | u64 skip_space; | |
1777 | u64 type; | |
1778 | u64 avail_space; | |
1779 | u64 used_space; | |
1780 | u64 min_stripe_size; | |
39fb26c3 | 1781 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1782 | int i = 0, nr_devices; |
1783 | int ret; | |
1784 | ||
7e33fd99 JB |
1785 | /* |
1786 | * We aren't under the device list lock, so this is racey-ish, but good | |
1787 | * enough for our purposes. | |
1788 | */ | |
b772a86e | 1789 | nr_devices = fs_info->fs_devices->open_devices; |
7e33fd99 JB |
1790 | if (!nr_devices) { |
1791 | smp_mb(); | |
1792 | nr_devices = fs_info->fs_devices->open_devices; | |
1793 | ASSERT(nr_devices); | |
1794 | if (!nr_devices) { | |
1795 | *free_bytes = 0; | |
1796 | return 0; | |
1797 | } | |
1798 | } | |
6d07bcec | 1799 | |
d9b0d9ba | 1800 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
6d07bcec MX |
1801 | GFP_NOFS); |
1802 | if (!devices_info) | |
1803 | return -ENOMEM; | |
1804 | ||
1805 | /* calc min stripe number for data space alloction */ | |
1806 | type = btrfs_get_alloc_profile(root, 1); | |
39fb26c3 | 1807 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1808 | min_stripes = 2; |
39fb26c3 MX |
1809 | num_stripes = nr_devices; |
1810 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1811 | min_stripes = 2; |
39fb26c3 MX |
1812 | num_stripes = 2; |
1813 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1814 | min_stripes = 4; |
39fb26c3 MX |
1815 | num_stripes = 4; |
1816 | } | |
6d07bcec MX |
1817 | |
1818 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1819 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1820 | else | |
1821 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1822 | ||
7e33fd99 JB |
1823 | if (fs_info->alloc_start) |
1824 | mutex_lock(&fs_devices->device_list_mutex); | |
1825 | rcu_read_lock(); | |
1826 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { | |
63a212ab SB |
1827 | if (!device->in_fs_metadata || !device->bdev || |
1828 | device->is_tgtdev_for_dev_replace) | |
6d07bcec MX |
1829 | continue; |
1830 | ||
7e33fd99 JB |
1831 | if (i >= nr_devices) |
1832 | break; | |
1833 | ||
6d07bcec MX |
1834 | avail_space = device->total_bytes - device->bytes_used; |
1835 | ||
1836 | /* align with stripe_len */ | |
f8c269d7 | 1837 | avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); |
6d07bcec MX |
1838 | avail_space *= BTRFS_STRIPE_LEN; |
1839 | ||
1840 | /* | |
1841 | * In order to avoid overwritting the superblock on the drive, | |
1842 | * btrfs starts at an offset of at least 1MB when doing chunk | |
1843 | * allocation. | |
1844 | */ | |
1845 | skip_space = 1024 * 1024; | |
1846 | ||
1847 | /* user can set the offset in fs_info->alloc_start. */ | |
7e33fd99 JB |
1848 | if (fs_info->alloc_start && |
1849 | fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1850 | device->total_bytes) { | |
1851 | rcu_read_unlock(); | |
6d07bcec MX |
1852 | skip_space = max(fs_info->alloc_start, skip_space); |
1853 | ||
7e33fd99 JB |
1854 | /* |
1855 | * btrfs can not use the free space in | |
1856 | * [0, skip_space - 1], we must subtract it from the | |
1857 | * total. In order to implement it, we account the used | |
1858 | * space in this range first. | |
1859 | */ | |
1860 | ret = btrfs_account_dev_extents_size(device, 0, | |
1861 | skip_space - 1, | |
1862 | &used_space); | |
1863 | if (ret) { | |
1864 | kfree(devices_info); | |
1865 | mutex_unlock(&fs_devices->device_list_mutex); | |
1866 | return ret; | |
1867 | } | |
1868 | ||
1869 | rcu_read_lock(); | |
6d07bcec | 1870 | |
7e33fd99 JB |
1871 | /* calc the free space in [0, skip_space - 1] */ |
1872 | skip_space -= used_space; | |
1873 | } | |
6d07bcec MX |
1874 | |
1875 | /* | |
1876 | * we can use the free space in [0, skip_space - 1], subtract | |
1877 | * it from the total. | |
1878 | */ | |
1879 | if (avail_space && avail_space >= skip_space) | |
1880 | avail_space -= skip_space; | |
1881 | else | |
1882 | avail_space = 0; | |
1883 | ||
1884 | if (avail_space < min_stripe_size) | |
1885 | continue; | |
1886 | ||
1887 | devices_info[i].dev = device; | |
1888 | devices_info[i].max_avail = avail_space; | |
1889 | ||
1890 | i++; | |
1891 | } | |
7e33fd99 JB |
1892 | rcu_read_unlock(); |
1893 | if (fs_info->alloc_start) | |
1894 | mutex_unlock(&fs_devices->device_list_mutex); | |
6d07bcec MX |
1895 | |
1896 | nr_devices = i; | |
1897 | ||
1898 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1899 | ||
1900 | i = nr_devices - 1; | |
1901 | avail_space = 0; | |
1902 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
1903 | if (num_stripes > nr_devices) |
1904 | num_stripes = nr_devices; | |
1905 | ||
6d07bcec MX |
1906 | if (devices_info[i].max_avail >= min_stripe_size) { |
1907 | int j; | |
1908 | u64 alloc_size; | |
1909 | ||
39fb26c3 | 1910 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 1911 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 1912 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
1913 | devices_info[j].max_avail -= alloc_size; |
1914 | } | |
1915 | i--; | |
1916 | nr_devices--; | |
1917 | } | |
1918 | ||
1919 | kfree(devices_info); | |
1920 | *free_bytes = avail_space; | |
1921 | return 0; | |
1922 | } | |
1923 | ||
ba7b6e62 DS |
1924 | /* |
1925 | * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. | |
1926 | * | |
1927 | * If there's a redundant raid level at DATA block groups, use the respective | |
1928 | * multiplier to scale the sizes. | |
1929 | * | |
1930 | * Unused device space usage is based on simulating the chunk allocator | |
1931 | * algorithm that respects the device sizes, order of allocations and the | |
1932 | * 'alloc_start' value, this is a close approximation of the actual use but | |
1933 | * there are other factors that may change the result (like a new metadata | |
1934 | * chunk). | |
1935 | * | |
1936 | * FIXME: not accurate for mixed block groups, total and free/used are ok, | |
1937 | * available appears slightly larger. | |
1938 | */ | |
8fd17795 CM |
1939 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1940 | { | |
815745cf AV |
1941 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
1942 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
1943 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
1944 | struct btrfs_space_info *found; |
1945 | u64 total_used = 0; | |
6d07bcec | 1946 | u64 total_free_data = 0; |
db94535d | 1947 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 1948 | __be32 *fsid = (__be32 *)fs_info->fsid; |
ba7b6e62 DS |
1949 | unsigned factor = 1; |
1950 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
6d07bcec | 1951 | int ret; |
8fd17795 | 1952 | |
15484377 MX |
1953 | /* |
1954 | * holding chunk_muext to avoid allocating new chunks, holding | |
1955 | * device_list_mutex to avoid the device being removed | |
1956 | */ | |
bd4d1088 | 1957 | rcu_read_lock(); |
89a55897 | 1958 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec | 1959 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
ba7b6e62 DS |
1960 | int i; |
1961 | ||
6d07bcec MX |
1962 | total_free_data += found->disk_total - found->disk_used; |
1963 | total_free_data -= | |
1964 | btrfs_account_ro_block_groups_free_space(found); | |
ba7b6e62 DS |
1965 | |
1966 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
1967 | if (!list_empty(&found->block_groups[i])) { | |
1968 | switch (i) { | |
1969 | case BTRFS_RAID_DUP: | |
1970 | case BTRFS_RAID_RAID1: | |
1971 | case BTRFS_RAID_RAID10: | |
1972 | factor = 2; | |
1973 | } | |
1974 | } | |
1975 | } | |
6d07bcec MX |
1976 | } |
1977 | ||
b742bb82 | 1978 | total_used += found->disk_used; |
89a55897 | 1979 | } |
ba7b6e62 | 1980 | |
bd4d1088 JB |
1981 | rcu_read_unlock(); |
1982 | ||
ba7b6e62 DS |
1983 | buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); |
1984 | buf->f_blocks >>= bits; | |
1985 | buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); | |
1986 | ||
1987 | /* Account global block reserve as used, it's in logical size already */ | |
1988 | spin_lock(&block_rsv->lock); | |
1989 | buf->f_bfree -= block_rsv->size >> bits; | |
1990 | spin_unlock(&block_rsv->lock); | |
1991 | ||
0d95c1be | 1992 | buf->f_bavail = div_u64(total_free_data, factor); |
815745cf | 1993 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
7e33fd99 | 1994 | if (ret) |
6d07bcec | 1995 | return ret; |
ba7b6e62 | 1996 | buf->f_bavail += div_u64(total_free_data, factor); |
6d07bcec | 1997 | buf->f_bavail = buf->f_bavail >> bits; |
d397712b | 1998 | |
ba7b6e62 DS |
1999 | buf->f_type = BTRFS_SUPER_MAGIC; |
2000 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2001 | buf->f_namelen = BTRFS_NAME_LEN; | |
2002 | ||
9d03632e | 2003 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 2004 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
2005 | on a big-endian or little-endian host */ |
2006 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
2007 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 | 2008 | /* Mask in the root object ID too, to disambiguate subvols */ |
2b0143b5 DH |
2009 | buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; |
2010 | buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; | |
32d48fa1 | 2011 | |
8fd17795 CM |
2012 | return 0; |
2013 | } | |
b5133862 | 2014 | |
aea52e19 AV |
2015 | static void btrfs_kill_super(struct super_block *sb) |
2016 | { | |
815745cf | 2017 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 2018 | kill_anon_super(sb); |
d22ca7de | 2019 | free_fs_info(fs_info); |
aea52e19 AV |
2020 | } |
2021 | ||
2e635a27 CM |
2022 | static struct file_system_type btrfs_fs_type = { |
2023 | .owner = THIS_MODULE, | |
2024 | .name = "btrfs", | |
061dbc6b | 2025 | .mount = btrfs_mount, |
aea52e19 | 2026 | .kill_sb = btrfs_kill_super, |
f667aef6 | 2027 | .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, |
2e635a27 | 2028 | }; |
7f78e035 | 2029 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 2030 | |
d8620958 TVB |
2031 | static int btrfs_control_open(struct inode *inode, struct file *file) |
2032 | { | |
2033 | /* | |
2034 | * The control file's private_data is used to hold the | |
2035 | * transaction when it is started and is used to keep | |
2036 | * track of whether a transaction is already in progress. | |
2037 | */ | |
2038 | file->private_data = NULL; | |
2039 | return 0; | |
2040 | } | |
2041 | ||
d352ac68 CM |
2042 | /* |
2043 | * used by btrfsctl to scan devices when no FS is mounted | |
2044 | */ | |
8a4b83cc CM |
2045 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
2046 | unsigned long arg) | |
2047 | { | |
2048 | struct btrfs_ioctl_vol_args *vol; | |
2049 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 2050 | int ret = -ENOTTY; |
8a4b83cc | 2051 | |
e441d54d CM |
2052 | if (!capable(CAP_SYS_ADMIN)) |
2053 | return -EPERM; | |
2054 | ||
dae7b665 LZ |
2055 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
2056 | if (IS_ERR(vol)) | |
2057 | return PTR_ERR(vol); | |
c071fcfd | 2058 | |
8a4b83cc CM |
2059 | switch (cmd) { |
2060 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 2061 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
2062 | &btrfs_fs_type, &fs_devices); |
2063 | break; | |
02db0844 JB |
2064 | case BTRFS_IOC_DEVICES_READY: |
2065 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
2066 | &btrfs_fs_type, &fs_devices); | |
2067 | if (ret) | |
2068 | break; | |
2069 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
2070 | break; | |
8a4b83cc | 2071 | } |
dae7b665 | 2072 | |
8a4b83cc | 2073 | kfree(vol); |
f819d837 | 2074 | return ret; |
8a4b83cc CM |
2075 | } |
2076 | ||
0176260f | 2077 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 2078 | { |
354aa0fb MX |
2079 | struct btrfs_trans_handle *trans; |
2080 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
2081 | ||
d4edf39b | 2082 | trans = btrfs_attach_transaction_barrier(root); |
354aa0fb MX |
2083 | if (IS_ERR(trans)) { |
2084 | /* no transaction, don't bother */ | |
2085 | if (PTR_ERR(trans) == -ENOENT) | |
2086 | return 0; | |
2087 | return PTR_ERR(trans); | |
2088 | } | |
2089 | return btrfs_commit_transaction(trans, root); | |
ed0dab6b Y |
2090 | } |
2091 | ||
9c5085c1 JB |
2092 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
2093 | { | |
2094 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
2095 | struct btrfs_fs_devices *cur_devices; | |
2096 | struct btrfs_device *dev, *first_dev = NULL; | |
2097 | struct list_head *head; | |
2098 | struct rcu_string *name; | |
2099 | ||
2100 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
2101 | cur_devices = fs_info->fs_devices; | |
2102 | while (cur_devices) { | |
2103 | head = &cur_devices->devices; | |
2104 | list_for_each_entry(dev, head, dev_list) { | |
aa9ddcd4 JB |
2105 | if (dev->missing) |
2106 | continue; | |
0aeb8a6e AJ |
2107 | if (!dev->name) |
2108 | continue; | |
9c5085c1 JB |
2109 | if (!first_dev || dev->devid < first_dev->devid) |
2110 | first_dev = dev; | |
2111 | } | |
2112 | cur_devices = cur_devices->seed; | |
2113 | } | |
2114 | ||
2115 | if (first_dev) { | |
2116 | rcu_read_lock(); | |
2117 | name = rcu_dereference(first_dev->name); | |
2118 | seq_escape(m, name->str, " \t\n\\"); | |
2119 | rcu_read_unlock(); | |
2120 | } else { | |
2121 | WARN_ON(1); | |
2122 | } | |
2123 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
2124 | return 0; | |
2125 | } | |
2126 | ||
b87221de | 2127 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 2128 | .drop_inode = btrfs_drop_inode, |
bd555975 | 2129 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 2130 | .put_super = btrfs_put_super, |
d5719762 | 2131 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 2132 | .show_options = btrfs_show_options, |
9c5085c1 | 2133 | .show_devname = btrfs_show_devname, |
4730a4bc | 2134 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
2135 | .alloc_inode = btrfs_alloc_inode, |
2136 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2137 | .statfs = btrfs_statfs, |
c146afad | 2138 | .remount_fs = btrfs_remount, |
0176260f | 2139 | .freeze_fs = btrfs_freeze, |
e20d96d6 | 2140 | }; |
a9218f6b CM |
2141 | |
2142 | static const struct file_operations btrfs_ctl_fops = { | |
d8620958 | 2143 | .open = btrfs_control_open, |
a9218f6b CM |
2144 | .unlocked_ioctl = btrfs_control_ioctl, |
2145 | .compat_ioctl = btrfs_control_ioctl, | |
2146 | .owner = THIS_MODULE, | |
6038f373 | 2147 | .llseek = noop_llseek, |
a9218f6b CM |
2148 | }; |
2149 | ||
2150 | static struct miscdevice btrfs_misc = { | |
578454ff | 2151 | .minor = BTRFS_MINOR, |
a9218f6b CM |
2152 | .name = "btrfs-control", |
2153 | .fops = &btrfs_ctl_fops | |
2154 | }; | |
2155 | ||
578454ff KS |
2156 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
2157 | MODULE_ALIAS("devname:btrfs-control"); | |
2158 | ||
a9218f6b CM |
2159 | static int btrfs_interface_init(void) |
2160 | { | |
2161 | return misc_register(&btrfs_misc); | |
2162 | } | |
2163 | ||
b2950863 | 2164 | static void btrfs_interface_exit(void) |
a9218f6b CM |
2165 | { |
2166 | if (misc_deregister(&btrfs_misc) < 0) | |
efe120a0 | 2167 | printk(KERN_INFO "BTRFS: misc_deregister failed for control device\n"); |
a9218f6b CM |
2168 | } |
2169 | ||
85965600 DS |
2170 | static void btrfs_print_info(void) |
2171 | { | |
2172 | printk(KERN_INFO "Btrfs loaded" | |
2173 | #ifdef CONFIG_BTRFS_DEBUG | |
2174 | ", debug=on" | |
2175 | #endif | |
79556c3d SB |
2176 | #ifdef CONFIG_BTRFS_ASSERT |
2177 | ", assert=on" | |
2178 | #endif | |
85965600 DS |
2179 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
2180 | ", integrity-checker=on" | |
2181 | #endif | |
2182 | "\n"); | |
2183 | } | |
2184 | ||
dc11dd5d JB |
2185 | static int btrfs_run_sanity_tests(void) |
2186 | { | |
06ea65a3 JB |
2187 | int ret; |
2188 | ||
294e30fe | 2189 | ret = btrfs_init_test_fs(); |
06ea65a3 JB |
2190 | if (ret) |
2191 | return ret; | |
294e30fe JB |
2192 | |
2193 | ret = btrfs_test_free_space_cache(); | |
2194 | if (ret) | |
2195 | goto out; | |
2196 | ret = btrfs_test_extent_buffer_operations(); | |
2197 | if (ret) | |
2198 | goto out; | |
2199 | ret = btrfs_test_extent_io(); | |
aaedb55b JB |
2200 | if (ret) |
2201 | goto out; | |
2202 | ret = btrfs_test_inodes(); | |
faa2dbf0 JB |
2203 | if (ret) |
2204 | goto out; | |
2205 | ret = btrfs_test_qgroups(); | |
294e30fe JB |
2206 | out: |
2207 | btrfs_destroy_test_fs(); | |
2208 | return ret; | |
dc11dd5d JB |
2209 | } |
2210 | ||
2e635a27 CM |
2211 | static int __init init_btrfs_fs(void) |
2212 | { | |
2c90e5d6 | 2213 | int err; |
58176a96 | 2214 | |
14a958e6 FDBM |
2215 | err = btrfs_hash_init(); |
2216 | if (err) | |
2217 | return err; | |
2218 | ||
63541927 FDBM |
2219 | btrfs_props_init(); |
2220 | ||
58176a96 JB |
2221 | err = btrfs_init_sysfs(); |
2222 | if (err) | |
14a958e6 | 2223 | goto free_hash; |
58176a96 | 2224 | |
143bede5 | 2225 | btrfs_init_compress(); |
d1310b2e | 2226 | |
261507a0 LZ |
2227 | err = btrfs_init_cachep(); |
2228 | if (err) | |
2229 | goto free_compress; | |
2230 | ||
d1310b2e | 2231 | err = extent_io_init(); |
2f4cbe64 WB |
2232 | if (err) |
2233 | goto free_cachep; | |
2234 | ||
d1310b2e CM |
2235 | err = extent_map_init(); |
2236 | if (err) | |
2237 | goto free_extent_io; | |
2238 | ||
6352b91d | 2239 | err = ordered_data_init(); |
2f4cbe64 WB |
2240 | if (err) |
2241 | goto free_extent_map; | |
c8b97818 | 2242 | |
6352b91d MX |
2243 | err = btrfs_delayed_inode_init(); |
2244 | if (err) | |
2245 | goto free_ordered_data; | |
2246 | ||
9247f317 | 2247 | err = btrfs_auto_defrag_init(); |
16cdcec7 MX |
2248 | if (err) |
2249 | goto free_delayed_inode; | |
2250 | ||
78a6184a | 2251 | err = btrfs_delayed_ref_init(); |
9247f317 MX |
2252 | if (err) |
2253 | goto free_auto_defrag; | |
2254 | ||
b9e9a6cb WS |
2255 | err = btrfs_prelim_ref_init(); |
2256 | if (err) | |
af13b492 | 2257 | goto free_delayed_ref; |
b9e9a6cb | 2258 | |
97eb6b69 | 2259 | err = btrfs_end_io_wq_init(); |
78a6184a | 2260 | if (err) |
af13b492 | 2261 | goto free_prelim_ref; |
78a6184a | 2262 | |
97eb6b69 DS |
2263 | err = btrfs_interface_init(); |
2264 | if (err) | |
2265 | goto free_end_io_wq; | |
2266 | ||
e565d4b9 JS |
2267 | btrfs_init_lockdep(); |
2268 | ||
85965600 | 2269 | btrfs_print_info(); |
dc11dd5d JB |
2270 | |
2271 | err = btrfs_run_sanity_tests(); | |
2272 | if (err) | |
2273 | goto unregister_ioctl; | |
2274 | ||
2275 | err = register_filesystem(&btrfs_fs_type); | |
2276 | if (err) | |
2277 | goto unregister_ioctl; | |
74255aa0 | 2278 | |
2f4cbe64 WB |
2279 | return 0; |
2280 | ||
a9218f6b CM |
2281 | unregister_ioctl: |
2282 | btrfs_interface_exit(); | |
97eb6b69 DS |
2283 | free_end_io_wq: |
2284 | btrfs_end_io_wq_exit(); | |
b9e9a6cb WS |
2285 | free_prelim_ref: |
2286 | btrfs_prelim_ref_exit(); | |
78a6184a MX |
2287 | free_delayed_ref: |
2288 | btrfs_delayed_ref_exit(); | |
9247f317 MX |
2289 | free_auto_defrag: |
2290 | btrfs_auto_defrag_exit(); | |
16cdcec7 MX |
2291 | free_delayed_inode: |
2292 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
2293 | free_ordered_data: |
2294 | ordered_data_exit(); | |
2f4cbe64 WB |
2295 | free_extent_map: |
2296 | extent_map_exit(); | |
d1310b2e CM |
2297 | free_extent_io: |
2298 | extent_io_exit(); | |
2f4cbe64 WB |
2299 | free_cachep: |
2300 | btrfs_destroy_cachep(); | |
261507a0 LZ |
2301 | free_compress: |
2302 | btrfs_exit_compress(); | |
2f4cbe64 | 2303 | btrfs_exit_sysfs(); |
14a958e6 FDBM |
2304 | free_hash: |
2305 | btrfs_hash_exit(); | |
2f4cbe64 | 2306 | return err; |
2e635a27 CM |
2307 | } |
2308 | ||
2309 | static void __exit exit_btrfs_fs(void) | |
2310 | { | |
39279cc3 | 2311 | btrfs_destroy_cachep(); |
78a6184a | 2312 | btrfs_delayed_ref_exit(); |
9247f317 | 2313 | btrfs_auto_defrag_exit(); |
16cdcec7 | 2314 | btrfs_delayed_inode_exit(); |
b9e9a6cb | 2315 | btrfs_prelim_ref_exit(); |
6352b91d | 2316 | ordered_data_exit(); |
a52d9a80 | 2317 | extent_map_exit(); |
d1310b2e | 2318 | extent_io_exit(); |
a9218f6b | 2319 | btrfs_interface_exit(); |
5ed5f588 | 2320 | btrfs_end_io_wq_exit(); |
2e635a27 | 2321 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 2322 | btrfs_exit_sysfs(); |
8a4b83cc | 2323 | btrfs_cleanup_fs_uuids(); |
261507a0 | 2324 | btrfs_exit_compress(); |
14a958e6 | 2325 | btrfs_hash_exit(); |
2e635a27 CM |
2326 | } |
2327 | ||
60efa5eb | 2328 | late_initcall(init_btrfs_fs); |
2e635a27 CM |
2329 | module_exit(exit_btrfs_fs) |
2330 | ||
2331 | MODULE_LICENSE("GPL"); |