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> |
4b4e25f2 | 45 | #include "compat.h" |
16cdcec7 | 46 | #include "delayed-inode.h" |
2e635a27 | 47 | #include "ctree.h" |
e20d96d6 | 48 | #include "disk-io.h" |
d5719762 | 49 | #include "transaction.h" |
2c90e5d6 | 50 | #include "btrfs_inode.h" |
3a686375 | 51 | #include "print-tree.h" |
5103e947 | 52 | #include "xattr.h" |
8a4b83cc | 53 | #include "volumes.h" |
be6e8dc0 | 54 | #include "export.h" |
c8b97818 | 55 | #include "compression.h" |
9c5085c1 | 56 | #include "rcu-string.h" |
8dabb742 | 57 | #include "dev-replace.h" |
74255aa0 | 58 | #include "free-space-cache.h" |
2e635a27 | 59 | |
1abe9b8a | 60 | #define CREATE_TRACE_POINTS |
61 | #include <trace/events/btrfs.h> | |
62 | ||
b87221de | 63 | static const struct super_operations btrfs_super_ops; |
830c4adb | 64 | static struct file_system_type btrfs_fs_type; |
75dfe396 | 65 | |
08748810 | 66 | static const char *btrfs_decode_error(int errno) |
acce952b | 67 | { |
08748810 | 68 | char *errstr = "unknown"; |
acce952b | 69 | |
70 | switch (errno) { | |
71 | case -EIO: | |
72 | errstr = "IO failure"; | |
73 | break; | |
74 | case -ENOMEM: | |
75 | errstr = "Out of memory"; | |
76 | break; | |
77 | case -EROFS: | |
78 | errstr = "Readonly filesystem"; | |
79 | break; | |
8c342930 JM |
80 | case -EEXIST: |
81 | errstr = "Object already exists"; | |
82 | break; | |
94ef7280 DS |
83 | case -ENOSPC: |
84 | errstr = "No space left"; | |
85 | break; | |
86 | case -ENOENT: | |
87 | errstr = "No such entry"; | |
88 | break; | |
acce952b | 89 | } |
90 | ||
91 | return errstr; | |
92 | } | |
93 | ||
bbece8a3 | 94 | static void save_error_info(struct btrfs_fs_info *fs_info) |
acce952b | 95 | { |
96 | /* | |
97 | * today we only save the error info into ram. Long term we'll | |
98 | * also send it down to the disk | |
99 | */ | |
87533c47 | 100 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); |
acce952b | 101 | } |
102 | ||
acce952b | 103 | /* btrfs handle error by forcing the filesystem readonly */ |
104 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) | |
105 | { | |
106 | struct super_block *sb = fs_info->sb; | |
107 | ||
108 | if (sb->s_flags & MS_RDONLY) | |
109 | return; | |
110 | ||
87533c47 | 111 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
acce952b | 112 | sb->s_flags |= MS_RDONLY; |
c2cf52eb | 113 | btrfs_info(fs_info, "forced readonly"); |
1acd6831 SB |
114 | /* |
115 | * Note that a running device replace operation is not | |
116 | * canceled here although there is no way to update | |
117 | * the progress. It would add the risk of a deadlock, | |
118 | * therefore the canceling is ommited. The only penalty | |
119 | * is that some I/O remains active until the procedure | |
120 | * completes. The next time when the filesystem is | |
121 | * mounted writeable again, the device replace | |
122 | * operation continues. | |
123 | */ | |
acce952b | 124 | } |
125 | } | |
126 | ||
533574c6 | 127 | #ifdef CONFIG_PRINTK |
acce952b | 128 | /* |
129 | * __btrfs_std_error decodes expected errors from the caller and | |
130 | * invokes the approciate error response. | |
131 | */ | |
132 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
4da35113 | 133 | unsigned int line, int errno, const char *fmt, ...) |
acce952b | 134 | { |
135 | struct super_block *sb = fs_info->sb; | |
acce952b | 136 | const char *errstr; |
137 | ||
138 | /* | |
139 | * Special case: if the error is EROFS, and we're already | |
140 | * under MS_RDONLY, then it is safe here. | |
141 | */ | |
142 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
4da35113 JM |
143 | return; |
144 | ||
08748810 | 145 | errstr = btrfs_decode_error(errno); |
4da35113 | 146 | if (fmt) { |
37252a66 ES |
147 | struct va_format vaf; |
148 | va_list args; | |
149 | ||
150 | va_start(args, fmt); | |
151 | vaf.fmt = fmt; | |
152 | vaf.va = &args; | |
4da35113 | 153 | |
08748810 DS |
154 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: errno=%d %s (%pV)\n", |
155 | sb->s_id, function, line, errno, errstr, &vaf); | |
37252a66 | 156 | va_end(args); |
4da35113 | 157 | } else { |
08748810 DS |
158 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: errno=%d %s\n", |
159 | sb->s_id, function, line, errno, errstr); | |
4da35113 | 160 | } |
acce952b | 161 | |
4da35113 | 162 | /* Don't go through full error handling during mount */ |
cf79ffb5 JB |
163 | save_error_info(fs_info); |
164 | if (sb->s_flags & MS_BORN) | |
4da35113 | 165 | btrfs_handle_error(fs_info); |
4da35113 | 166 | } |
acce952b | 167 | |
533574c6 | 168 | static const char * const logtypes[] = { |
4da35113 JM |
169 | "emergency", |
170 | "alert", | |
171 | "critical", | |
172 | "error", | |
173 | "warning", | |
174 | "notice", | |
175 | "info", | |
176 | "debug", | |
177 | }; | |
178 | ||
c2cf52eb | 179 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
4da35113 JM |
180 | { |
181 | struct super_block *sb = fs_info->sb; | |
182 | char lvl[4]; | |
183 | struct va_format vaf; | |
184 | va_list args; | |
185 | const char *type = logtypes[4]; | |
533574c6 | 186 | int kern_level; |
4da35113 JM |
187 | |
188 | va_start(args, fmt); | |
189 | ||
533574c6 JP |
190 | kern_level = printk_get_level(fmt); |
191 | if (kern_level) { | |
192 | size_t size = printk_skip_level(fmt) - fmt; | |
193 | memcpy(lvl, fmt, size); | |
194 | lvl[size] = '\0'; | |
195 | fmt += size; | |
196 | type = logtypes[kern_level - '0']; | |
4da35113 JM |
197 | } else |
198 | *lvl = '\0'; | |
199 | ||
200 | vaf.fmt = fmt; | |
201 | vaf.va = &args; | |
533574c6 | 202 | |
c2cf52eb | 203 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); |
533574c6 JP |
204 | |
205 | va_end(args); | |
206 | } | |
207 | ||
208 | #else | |
209 | ||
210 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
211 | unsigned int line, int errno, const char *fmt, ...) | |
212 | { | |
213 | struct super_block *sb = fs_info->sb; | |
214 | ||
215 | /* | |
216 | * Special case: if the error is EROFS, and we're already | |
217 | * under MS_RDONLY, then it is safe here. | |
218 | */ | |
219 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
220 | return; | |
221 | ||
222 | /* Don't go through full error handling during mount */ | |
223 | if (sb->s_flags & MS_BORN) { | |
224 | save_error_info(fs_info); | |
225 | btrfs_handle_error(fs_info); | |
226 | } | |
acce952b | 227 | } |
533574c6 | 228 | #endif |
acce952b | 229 | |
49b25e05 JM |
230 | /* |
231 | * We only mark the transaction aborted and then set the file system read-only. | |
232 | * This will prevent new transactions from starting or trying to join this | |
233 | * one. | |
234 | * | |
235 | * This means that error recovery at the call site is limited to freeing | |
236 | * any local memory allocations and passing the error code up without | |
237 | * further cleanup. The transaction should complete as it normally would | |
238 | * in the call path but will return -EIO. | |
239 | * | |
240 | * We'll complete the cleanup in btrfs_end_transaction and | |
241 | * btrfs_commit_transaction. | |
242 | */ | |
243 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, | |
244 | struct btrfs_root *root, const char *function, | |
245 | unsigned int line, int errno) | |
246 | { | |
08748810 DS |
247 | /* |
248 | * Report first abort since mount | |
249 | */ | |
250 | if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, | |
251 | &root->fs_info->fs_state)) { | |
252 | WARN(1, KERN_DEBUG "btrfs: Transaction aborted (error %d)\n", | |
253 | errno); | |
254 | } | |
49b25e05 JM |
255 | trans->aborted = errno; |
256 | /* Nothing used. The other threads that have joined this | |
257 | * transaction may be able to continue. */ | |
258 | if (!trans->blocks_used) { | |
69ce977a MX |
259 | const char *errstr; |
260 | ||
08748810 | 261 | errstr = btrfs_decode_error(errno); |
c2cf52eb SK |
262 | btrfs_warn(root->fs_info, |
263 | "%s:%d: Aborting unused transaction(%s).", | |
264 | function, line, errstr); | |
acce952b | 265 | return; |
49b25e05 | 266 | } |
8d25a086 | 267 | ACCESS_ONCE(trans->transaction->aborted) = errno; |
49b25e05 JM |
268 | __btrfs_std_error(root->fs_info, function, line, errno, NULL); |
269 | } | |
8c342930 JM |
270 | /* |
271 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
272 | * issues an alert, and either panics or BUGs, depending on mount options. | |
273 | */ | |
274 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, | |
275 | unsigned int line, int errno, const char *fmt, ...) | |
276 | { | |
8c342930 JM |
277 | char *s_id = "<unknown>"; |
278 | const char *errstr; | |
279 | struct va_format vaf = { .fmt = fmt }; | |
280 | va_list args; | |
acce952b | 281 | |
8c342930 JM |
282 | if (fs_info) |
283 | s_id = fs_info->sb->s_id; | |
acce952b | 284 | |
8c342930 JM |
285 | va_start(args, fmt); |
286 | vaf.va = &args; | |
287 | ||
08748810 | 288 | errstr = btrfs_decode_error(errno); |
aa43a17c | 289 | if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) |
08748810 DS |
290 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
291 | s_id, function, line, &vaf, errno, errstr); | |
8c342930 | 292 | |
08748810 DS |
293 | printk(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
294 | s_id, function, line, &vaf, errno, errstr); | |
8c342930 JM |
295 | va_end(args); |
296 | /* Caller calls BUG() */ | |
acce952b | 297 | } |
298 | ||
d397712b | 299 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 300 | { |
815745cf | 301 | (void)close_ctree(btrfs_sb(sb)->tree_root); |
aea52e19 AV |
302 | /* FIXME: need to fix VFS to return error? */ |
303 | /* AV: return it _where_? ->put_super() can be triggered by any number | |
304 | * of async events, up to and including delivery of SIGKILL to the | |
305 | * last process that kept it busy. Or segfault in the aforementioned | |
306 | * process... Whom would you report that to? | |
307 | */ | |
75dfe396 CM |
308 | } |
309 | ||
95e05289 | 310 | enum { |
73f73415 | 311 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
312 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
313 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
261507a0 LZ |
314 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
315 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
91435650 | 316 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
9555c6c1 ID |
317 | Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, |
318 | Opt_no_space_cache, Opt_recovery, Opt_skip_balance, | |
21adbd5c | 319 | Opt_check_integrity, Opt_check_integrity_including_extent_data, |
8c342930 | 320 | Opt_check_integrity_print_mask, Opt_fatal_errors, |
9555c6c1 | 321 | Opt_err, |
95e05289 CM |
322 | }; |
323 | ||
324 | static match_table_t tokens = { | |
dfe25020 | 325 | {Opt_degraded, "degraded"}, |
95e05289 | 326 | {Opt_subvol, "subvol=%s"}, |
73f73415 | 327 | {Opt_subvolid, "subvolid=%d"}, |
43e570b0 | 328 | {Opt_device, "device=%s"}, |
b6cda9bc | 329 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 330 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 331 | {Opt_nobarrier, "nobarrier"}, |
6f568d35 | 332 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 333 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 334 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 335 | {Opt_compress, "compress"}, |
261507a0 | 336 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 337 | {Opt_compress_force, "compress-force"}, |
261507a0 | 338 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 339 | {Opt_ssd, "ssd"}, |
451d7585 | 340 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 341 | {Opt_nossd, "nossd"}, |
33268eaf | 342 | {Opt_noacl, "noacl"}, |
3a5e1404 | 343 | {Opt_notreelog, "notreelog"}, |
dccae999 | 344 | {Opt_flushoncommit, "flushoncommit"}, |
97e728d4 | 345 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 346 | {Opt_discard, "discard"}, |
0af3d00b | 347 | {Opt_space_cache, "space_cache"}, |
88c2ba3b | 348 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 349 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 350 | {Opt_enospc_debug, "enospc_debug"}, |
e15d0542 | 351 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 352 | {Opt_defrag, "autodefrag"}, |
4b9465cb | 353 | {Opt_inode_cache, "inode_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"}, | |
8c342930 | 360 | {Opt_fatal_errors, "fatal_errors=%s"}, |
33268eaf | 361 | {Opt_err, NULL}, |
95e05289 CM |
362 | }; |
363 | ||
edf24abe CH |
364 | /* |
365 | * Regular mount options parser. Everything that is needed only when | |
366 | * reading in a new superblock is parsed here. | |
49b25e05 | 367 | * XXX JDM: This needs to be cleaned up for remount. |
edf24abe CH |
368 | */ |
369 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 370 | { |
edf24abe | 371 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 372 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
373 | char *p, *num, *orig = NULL; |
374 | u64 cache_gen; | |
4543df7e | 375 | int intarg; |
a7a3f7ca | 376 | int ret = 0; |
261507a0 LZ |
377 | char *compress_type; |
378 | bool compress_force = false; | |
b6cda9bc | 379 | |
6c41761f | 380 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 JB |
381 | if (cache_gen) |
382 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); | |
383 | ||
95e05289 | 384 | if (!options) |
73bc1876 | 385 | goto out; |
95e05289 | 386 | |
be20aa9d CM |
387 | /* |
388 | * strsep changes the string, duplicate it because parse_options | |
389 | * gets called twice | |
390 | */ | |
391 | options = kstrdup(options, GFP_NOFS); | |
392 | if (!options) | |
393 | return -ENOMEM; | |
394 | ||
da495ecc | 395 | orig = options; |
be20aa9d | 396 | |
edf24abe | 397 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
398 | int token; |
399 | if (!*p) | |
400 | continue; | |
401 | ||
402 | token = match_token(p, tokens, args); | |
403 | switch (token) { | |
dfe25020 | 404 | case Opt_degraded: |
edf24abe CH |
405 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
406 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 407 | break; |
95e05289 | 408 | case Opt_subvol: |
73f73415 | 409 | case Opt_subvolid: |
e15d0542 | 410 | case Opt_subvolrootid: |
43e570b0 | 411 | case Opt_device: |
edf24abe | 412 | /* |
43e570b0 | 413 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
414 | * and can be happily ignored here. |
415 | */ | |
b6cda9bc CM |
416 | break; |
417 | case Opt_nodatasum: | |
067c28ad | 418 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
edf24abe | 419 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
420 | break; |
421 | case Opt_nodatacow: | |
bedb2cca AP |
422 | if (!btrfs_test_opt(root, COMPRESS) || |
423 | !btrfs_test_opt(root, FORCE_COMPRESS)) { | |
424 | printk(KERN_INFO "btrfs: setting nodatacow, compression disabled\n"); | |
425 | } else { | |
426 | printk(KERN_INFO "btrfs: setting nodatacow\n"); | |
427 | } | |
428 | info->compress_type = BTRFS_COMPRESS_NONE; | |
429 | btrfs_clear_opt(info->mount_opt, COMPRESS); | |
430 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
edf24abe CH |
431 | btrfs_set_opt(info->mount_opt, NODATACOW); |
432 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 433 | break; |
a555f810 | 434 | case Opt_compress_force: |
261507a0 LZ |
435 | case Opt_compress_force_type: |
436 | compress_force = true; | |
1c697d4a | 437 | /* Fallthrough */ |
261507a0 LZ |
438 | case Opt_compress: |
439 | case Opt_compress_type: | |
440 | if (token == Opt_compress || | |
441 | token == Opt_compress_force || | |
442 | strcmp(args[0].from, "zlib") == 0) { | |
443 | compress_type = "zlib"; | |
444 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
063849ea | 445 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
446 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
447 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
a6fa6fae LZ |
448 | } else if (strcmp(args[0].from, "lzo") == 0) { |
449 | compress_type = "lzo"; | |
450 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 451 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
452 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
453 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
2b0ce2c2 | 454 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
063849ea AH |
455 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
456 | compress_type = "no"; | |
457 | info->compress_type = BTRFS_COMPRESS_NONE; | |
458 | btrfs_clear_opt(info->mount_opt, COMPRESS); | |
459 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
460 | compress_force = false; | |
261507a0 LZ |
461 | } else { |
462 | ret = -EINVAL; | |
463 | goto out; | |
464 | } | |
465 | ||
261507a0 LZ |
466 | if (compress_force) { |
467 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
468 | pr_info("btrfs: force %s compression\n", | |
469 | compress_type); | |
470 | } else | |
471 | pr_info("btrfs: use %s compression\n", | |
472 | compress_type); | |
a555f810 | 473 | break; |
e18e4809 | 474 | case Opt_ssd: |
edf24abe CH |
475 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
476 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 477 | break; |
451d7585 CM |
478 | case Opt_ssd_spread: |
479 | printk(KERN_INFO "btrfs: use spread ssd " | |
480 | "allocation scheme\n"); | |
481 | btrfs_set_opt(info->mount_opt, SSD); | |
482 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
483 | break; | |
3b30c22f | 484 | case Opt_nossd: |
451d7585 CM |
485 | printk(KERN_INFO "btrfs: not using ssd allocation " |
486 | "scheme\n"); | |
c289811c | 487 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 488 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 489 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 490 | break; |
21ad10cf | 491 | case Opt_nobarrier: |
edf24abe CH |
492 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
493 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 494 | break; |
4543df7e CM |
495 | case Opt_thread_pool: |
496 | intarg = 0; | |
497 | match_int(&args[0], &intarg); | |
0d2450ab | 498 | if (intarg) |
4543df7e | 499 | info->thread_pool_size = intarg; |
4543df7e | 500 | break; |
6f568d35 | 501 | case Opt_max_inline: |
edf24abe CH |
502 | num = match_strdup(&args[0]); |
503 | if (num) { | |
91748467 | 504 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
505 | kfree(num); |
506 | ||
15ada040 CM |
507 | if (info->max_inline) { |
508 | info->max_inline = max_t(u64, | |
509 | info->max_inline, | |
510 | root->sectorsize); | |
511 | } | |
edf24abe | 512 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
21380931 | 513 | (unsigned long long)info->max_inline); |
6f568d35 CM |
514 | } |
515 | break; | |
8f662a76 | 516 | case Opt_alloc_start: |
edf24abe CH |
517 | num = match_strdup(&args[0]); |
518 | if (num) { | |
c018daec | 519 | mutex_lock(&info->chunk_mutex); |
91748467 | 520 | info->alloc_start = memparse(num, NULL); |
c018daec | 521 | mutex_unlock(&info->chunk_mutex); |
edf24abe CH |
522 | kfree(num); |
523 | printk(KERN_INFO | |
524 | "btrfs: allocations start at %llu\n", | |
21380931 | 525 | (unsigned long long)info->alloc_start); |
8f662a76 CM |
526 | } |
527 | break; | |
33268eaf JB |
528 | case Opt_noacl: |
529 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
530 | break; | |
3a5e1404 SW |
531 | case Opt_notreelog: |
532 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
533 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
534 | break; | |
dccae999 SW |
535 | case Opt_flushoncommit: |
536 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
537 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
538 | break; | |
97e728d4 JB |
539 | case Opt_ratio: |
540 | intarg = 0; | |
541 | match_int(&args[0], &intarg); | |
542 | if (intarg) { | |
543 | info->metadata_ratio = intarg; | |
544 | printk(KERN_INFO "btrfs: metadata ratio %d\n", | |
545 | info->metadata_ratio); | |
546 | } | |
547 | break; | |
e244a0ae CH |
548 | case Opt_discard: |
549 | btrfs_set_opt(info->mount_opt, DISCARD); | |
550 | break; | |
0af3d00b | 551 | case Opt_space_cache: |
0af3d00b | 552 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
0de90876 | 553 | break; |
73bc1876 JB |
554 | case Opt_no_space_cache: |
555 | printk(KERN_INFO "btrfs: disabling disk space caching\n"); | |
556 | btrfs_clear_opt(info->mount_opt, SPACE_CACHE); | |
557 | break; | |
4b9465cb CM |
558 | case Opt_inode_cache: |
559 | printk(KERN_INFO "btrfs: enabling inode map caching\n"); | |
560 | btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); | |
561 | break; | |
88c2ba3b JB |
562 | case Opt_clear_cache: |
563 | printk(KERN_INFO "btrfs: force clearing of disk cache\n"); | |
564 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); | |
0af3d00b | 565 | break; |
4260f7c7 SW |
566 | case Opt_user_subvol_rm_allowed: |
567 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
568 | break; | |
91435650 CM |
569 | case Opt_enospc_debug: |
570 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
571 | break; | |
4cb5300b | 572 | case Opt_defrag: |
48940662 | 573 | printk(KERN_INFO "btrfs: enabling auto defrag\n"); |
4cb5300b CM |
574 | btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); |
575 | break; | |
af31f5e5 | 576 | case Opt_recovery: |
48940662 | 577 | printk(KERN_INFO "btrfs: enabling auto recovery\n"); |
af31f5e5 CM |
578 | btrfs_set_opt(info->mount_opt, RECOVERY); |
579 | break; | |
9555c6c1 ID |
580 | case Opt_skip_balance: |
581 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
582 | break; | |
21adbd5c SB |
583 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
584 | case Opt_check_integrity_including_extent_data: | |
585 | printk(KERN_INFO "btrfs: enabling check integrity" | |
586 | " including extent data\n"); | |
587 | btrfs_set_opt(info->mount_opt, | |
588 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
589 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
590 | break; | |
591 | case Opt_check_integrity: | |
592 | printk(KERN_INFO "btrfs: enabling check integrity\n"); | |
593 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
594 | break; | |
595 | case Opt_check_integrity_print_mask: | |
596 | intarg = 0; | |
597 | match_int(&args[0], &intarg); | |
598 | if (intarg) { | |
599 | info->check_integrity_print_mask = intarg; | |
600 | printk(KERN_INFO "btrfs:" | |
601 | " check_integrity_print_mask 0x%x\n", | |
602 | info->check_integrity_print_mask); | |
603 | } | |
604 | break; | |
605 | #else | |
606 | case Opt_check_integrity_including_extent_data: | |
607 | case Opt_check_integrity: | |
608 | case Opt_check_integrity_print_mask: | |
609 | printk(KERN_ERR "btrfs: support for check_integrity*" | |
610 | " not compiled in!\n"); | |
611 | ret = -EINVAL; | |
612 | goto out; | |
613 | #endif | |
8c342930 JM |
614 | case Opt_fatal_errors: |
615 | if (strcmp(args[0].from, "panic") == 0) | |
616 | btrfs_set_opt(info->mount_opt, | |
617 | PANIC_ON_FATAL_ERROR); | |
618 | else if (strcmp(args[0].from, "bug") == 0) | |
619 | btrfs_clear_opt(info->mount_opt, | |
620 | PANIC_ON_FATAL_ERROR); | |
621 | else { | |
622 | ret = -EINVAL; | |
623 | goto out; | |
624 | } | |
625 | break; | |
a7a3f7ca SW |
626 | case Opt_err: |
627 | printk(KERN_INFO "btrfs: unrecognized mount option " | |
628 | "'%s'\n", p); | |
629 | ret = -EINVAL; | |
630 | goto out; | |
95e05289 | 631 | default: |
be20aa9d | 632 | break; |
95e05289 CM |
633 | } |
634 | } | |
a7a3f7ca | 635 | out: |
73bc1876 JB |
636 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
637 | printk(KERN_INFO "btrfs: disk space caching is enabled\n"); | |
da495ecc | 638 | kfree(orig); |
a7a3f7ca | 639 | return ret; |
edf24abe CH |
640 | } |
641 | ||
642 | /* | |
643 | * Parse mount options that are required early in the mount process. | |
644 | * | |
645 | * All other options will be parsed on much later in the mount process and | |
646 | * only when we need to allocate a new super block. | |
647 | */ | |
97288f2c | 648 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 649 | void *holder, char **subvol_name, u64 *subvol_objectid, |
5e2a4b25 | 650 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
651 | { |
652 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 653 | char *device_name, *opts, *orig, *p; |
edf24abe | 654 | int error = 0; |
73f73415 | 655 | int intarg; |
edf24abe CH |
656 | |
657 | if (!options) | |
830c4adb | 658 | return 0; |
edf24abe CH |
659 | |
660 | /* | |
661 | * strsep changes the string, duplicate it because parse_options | |
662 | * gets called twice | |
663 | */ | |
664 | opts = kstrdup(options, GFP_KERNEL); | |
665 | if (!opts) | |
666 | return -ENOMEM; | |
3f3d0bc0 | 667 | orig = opts; |
edf24abe CH |
668 | |
669 | while ((p = strsep(&opts, ",")) != NULL) { | |
670 | int token; | |
671 | if (!*p) | |
672 | continue; | |
673 | ||
674 | token = match_token(p, tokens, args); | |
675 | switch (token) { | |
676 | case Opt_subvol: | |
a90e8b6f | 677 | kfree(*subvol_name); |
edf24abe CH |
678 | *subvol_name = match_strdup(&args[0]); |
679 | break; | |
73f73415 JB |
680 | case Opt_subvolid: |
681 | intarg = 0; | |
4849f01d JB |
682 | error = match_int(&args[0], &intarg); |
683 | if (!error) { | |
684 | /* we want the original fs_tree */ | |
685 | if (!intarg) | |
686 | *subvol_objectid = | |
687 | BTRFS_FS_TREE_OBJECTID; | |
688 | else | |
689 | *subvol_objectid = intarg; | |
690 | } | |
73f73415 | 691 | break; |
e15d0542 | 692 | case Opt_subvolrootid: |
5e2a4b25 DS |
693 | printk(KERN_WARNING |
694 | "btrfs: 'subvolrootid' mount option is deprecated and has no effect\n"); | |
e15d0542 | 695 | break; |
43e570b0 | 696 | case Opt_device: |
83c8c9bd JL |
697 | device_name = match_strdup(&args[0]); |
698 | if (!device_name) { | |
699 | error = -ENOMEM; | |
700 | goto out; | |
701 | } | |
702 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 703 | flags, holder, fs_devices); |
83c8c9bd | 704 | kfree(device_name); |
43e570b0 | 705 | if (error) |
830c4adb | 706 | goto out; |
43e570b0 | 707 | break; |
edf24abe CH |
708 | default: |
709 | break; | |
710 | } | |
711 | } | |
712 | ||
830c4adb | 713 | out: |
3f3d0bc0 | 714 | kfree(orig); |
edf24abe | 715 | return error; |
95e05289 CM |
716 | } |
717 | ||
73f73415 JB |
718 | static struct dentry *get_default_root(struct super_block *sb, |
719 | u64 subvol_objectid) | |
720 | { | |
815745cf AV |
721 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
722 | struct btrfs_root *root = fs_info->tree_root; | |
73f73415 JB |
723 | struct btrfs_root *new_root; |
724 | struct btrfs_dir_item *di; | |
725 | struct btrfs_path *path; | |
726 | struct btrfs_key location; | |
727 | struct inode *inode; | |
73f73415 JB |
728 | u64 dir_id; |
729 | int new = 0; | |
730 | ||
731 | /* | |
732 | * We have a specific subvol we want to mount, just setup location and | |
733 | * go look up the root. | |
734 | */ | |
735 | if (subvol_objectid) { | |
736 | location.objectid = subvol_objectid; | |
737 | location.type = BTRFS_ROOT_ITEM_KEY; | |
738 | location.offset = (u64)-1; | |
739 | goto find_root; | |
740 | } | |
741 | ||
742 | path = btrfs_alloc_path(); | |
743 | if (!path) | |
744 | return ERR_PTR(-ENOMEM); | |
745 | path->leave_spinning = 1; | |
746 | ||
747 | /* | |
748 | * Find the "default" dir item which points to the root item that we | |
749 | * will mount by default if we haven't been given a specific subvolume | |
750 | * to mount. | |
751 | */ | |
815745cf | 752 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 753 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
754 | if (IS_ERR(di)) { |
755 | btrfs_free_path(path); | |
fb4f6f91 | 756 | return ERR_CAST(di); |
b0839166 | 757 | } |
73f73415 JB |
758 | if (!di) { |
759 | /* | |
760 | * Ok the default dir item isn't there. This is weird since | |
761 | * it's always been there, but don't freak out, just try and | |
762 | * mount to root most subvolume. | |
763 | */ | |
764 | btrfs_free_path(path); | |
765 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
815745cf | 766 | new_root = fs_info->fs_root; |
73f73415 JB |
767 | goto setup_root; |
768 | } | |
769 | ||
770 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
771 | btrfs_free_path(path); | |
772 | ||
773 | find_root: | |
815745cf | 774 | new_root = btrfs_read_fs_root_no_name(fs_info, &location); |
73f73415 | 775 | if (IS_ERR(new_root)) |
d0b678cb | 776 | return ERR_CAST(new_root); |
73f73415 | 777 | |
73f73415 JB |
778 | dir_id = btrfs_root_dirid(&new_root->root_item); |
779 | setup_root: | |
780 | location.objectid = dir_id; | |
781 | location.type = BTRFS_INODE_ITEM_KEY; | |
782 | location.offset = 0; | |
783 | ||
784 | inode = btrfs_iget(sb, &location, new_root, &new); | |
4cbd1149 DC |
785 | if (IS_ERR(inode)) |
786 | return ERR_CAST(inode); | |
73f73415 JB |
787 | |
788 | /* | |
789 | * If we're just mounting the root most subvol put the inode and return | |
790 | * a reference to the dentry. We will have already gotten a reference | |
791 | * to the inode in btrfs_fill_super so we're good to go. | |
792 | */ | |
793 | if (!new && sb->s_root->d_inode == inode) { | |
794 | iput(inode); | |
795 | return dget(sb->s_root); | |
796 | } | |
797 | ||
ba5b8958 | 798 | return d_obtain_alias(inode); |
73f73415 JB |
799 | } |
800 | ||
d397712b | 801 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 802 | struct btrfs_fs_devices *fs_devices, |
d397712b | 803 | void *data, int silent) |
75dfe396 | 804 | { |
d397712b | 805 | struct inode *inode; |
815745cf | 806 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 807 | struct btrfs_key key; |
39279cc3 | 808 | int err; |
a429e513 | 809 | |
39279cc3 CM |
810 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
811 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
812 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 813 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 814 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 815 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 816 | sb->s_time_gran = 1; |
0eda294d | 817 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 818 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 819 | #endif |
0c4d2d95 | 820 | sb->s_flags |= MS_I_VERSION; |
ad2b2c80 AV |
821 | err = open_ctree(sb, fs_devices, (char *)data); |
822 | if (err) { | |
39279cc3 | 823 | printk("btrfs: open_ctree failed\n"); |
ad2b2c80 | 824 | return err; |
a429e513 CM |
825 | } |
826 | ||
5d4f98a2 YZ |
827 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
828 | key.type = BTRFS_INODE_ITEM_KEY; | |
829 | key.offset = 0; | |
98c7089c | 830 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
831 | if (IS_ERR(inode)) { |
832 | err = PTR_ERR(inode); | |
39279cc3 | 833 | goto fail_close; |
f254e52c | 834 | } |
f254e52c | 835 | |
48fde701 AV |
836 | sb->s_root = d_make_root(inode); |
837 | if (!sb->s_root) { | |
39279cc3 CM |
838 | err = -ENOMEM; |
839 | goto fail_close; | |
f254e52c | 840 | } |
58176a96 | 841 | |
6885f308 | 842 | save_mount_options(sb, data); |
90a887c9 | 843 | cleancache_init_fs(sb); |
59553edf | 844 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 845 | return 0; |
39279cc3 CM |
846 | |
847 | fail_close: | |
815745cf | 848 | close_ctree(fs_info->tree_root); |
39279cc3 | 849 | return err; |
2619ba1f CM |
850 | } |
851 | ||
6bf13c0c | 852 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
853 | { |
854 | struct btrfs_trans_handle *trans; | |
815745cf AV |
855 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
856 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 857 | |
1abe9b8a | 858 | trace_btrfs_sync_fs(wait); |
859 | ||
39279cc3 | 860 | if (!wait) { |
815745cf | 861 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
862 | return 0; |
863 | } | |
771ed689 | 864 | |
c73e2936 | 865 | btrfs_wait_all_ordered_extents(fs_info, 1); |
771ed689 | 866 | |
d4edf39b | 867 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 868 | if (IS_ERR(trans)) { |
354aa0fb MX |
869 | /* no transaction, don't bother */ |
870 | if (PTR_ERR(trans) == -ENOENT) | |
60376ce4 | 871 | return 0; |
98d5dc13 | 872 | return PTR_ERR(trans); |
60376ce4 | 873 | } |
bd7de2c9 | 874 | return btrfs_commit_transaction(trans, root); |
2c90e5d6 CM |
875 | } |
876 | ||
34c80b1d | 877 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 878 | { |
815745cf AV |
879 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
880 | struct btrfs_root *root = info->tree_root; | |
200da64e | 881 | char *compress_type; |
a9572a15 EP |
882 | |
883 | if (btrfs_test_opt(root, DEGRADED)) | |
884 | seq_puts(seq, ",degraded"); | |
885 | if (btrfs_test_opt(root, NODATASUM)) | |
886 | seq_puts(seq, ",nodatasum"); | |
887 | if (btrfs_test_opt(root, NODATACOW)) | |
888 | seq_puts(seq, ",nodatacow"); | |
889 | if (btrfs_test_opt(root, NOBARRIER)) | |
890 | seq_puts(seq, ",nobarrier"); | |
a9572a15 | 891 | if (info->max_inline != 8192 * 1024) |
21380931 JB |
892 | seq_printf(seq, ",max_inline=%llu", |
893 | (unsigned long long)info->max_inline); | |
a9572a15 | 894 | if (info->alloc_start != 0) |
21380931 JB |
895 | seq_printf(seq, ",alloc_start=%llu", |
896 | (unsigned long long)info->alloc_start); | |
a9572a15 EP |
897 | if (info->thread_pool_size != min_t(unsigned long, |
898 | num_online_cpus() + 2, 8)) | |
899 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
200da64e TI |
900 | if (btrfs_test_opt(root, COMPRESS)) { |
901 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) | |
902 | compress_type = "zlib"; | |
903 | else | |
904 | compress_type = "lzo"; | |
905 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
906 | seq_printf(seq, ",compress-force=%s", compress_type); | |
907 | else | |
908 | seq_printf(seq, ",compress=%s", compress_type); | |
909 | } | |
c289811c CM |
910 | if (btrfs_test_opt(root, NOSSD)) |
911 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
912 | if (btrfs_test_opt(root, SSD_SPREAD)) |
913 | seq_puts(seq, ",ssd_spread"); | |
914 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 915 | seq_puts(seq, ",ssd"); |
3a5e1404 | 916 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 917 | seq_puts(seq, ",notreelog"); |
dccae999 | 918 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 919 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
920 | if (btrfs_test_opt(root, DISCARD)) |
921 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
922 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
923 | seq_puts(seq, ",noacl"); | |
200da64e TI |
924 | if (btrfs_test_opt(root, SPACE_CACHE)) |
925 | seq_puts(seq, ",space_cache"); | |
73bc1876 | 926 | else |
8965593e | 927 | seq_puts(seq, ",nospace_cache"); |
200da64e TI |
928 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
929 | seq_puts(seq, ",clear_cache"); | |
930 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
931 | seq_puts(seq, ",user_subvol_rm_allowed"); | |
0942caa3 DS |
932 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
933 | seq_puts(seq, ",enospc_debug"); | |
934 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
935 | seq_puts(seq, ",autodefrag"); | |
936 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) | |
937 | seq_puts(seq, ",inode_cache"); | |
9555c6c1 ID |
938 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
939 | seq_puts(seq, ",skip_balance"); | |
8c342930 JM |
940 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
941 | seq_puts(seq, ",fatal_errors=panic"); | |
a9572a15 EP |
942 | return 0; |
943 | } | |
944 | ||
a061fc8d | 945 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 946 | { |
815745cf AV |
947 | struct btrfs_fs_info *p = data; |
948 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 949 | |
815745cf | 950 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
951 | } |
952 | ||
450ba0ea JB |
953 | static int btrfs_set_super(struct super_block *s, void *data) |
954 | { | |
6de1d09d AV |
955 | int err = set_anon_super(s, data); |
956 | if (!err) | |
957 | s->s_fs_info = data; | |
958 | return err; | |
4b82d6e4 Y |
959 | } |
960 | ||
f9d9ef62 DS |
961 | /* |
962 | * subvolumes are identified by ino 256 | |
963 | */ | |
964 | static inline int is_subvolume_inode(struct inode *inode) | |
965 | { | |
966 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
967 | return 1; | |
968 | return 0; | |
969 | } | |
970 | ||
830c4adb JB |
971 | /* |
972 | * This will strip out the subvol=%s argument for an argument string and add | |
973 | * subvolid=0 to make sure we get the actual tree root for path walking to the | |
974 | * subvol we want. | |
975 | */ | |
976 | static char *setup_root_args(char *args) | |
977 | { | |
f60d16a8 JM |
978 | unsigned len = strlen(args) + 2 + 1; |
979 | char *src, *dst, *buf; | |
830c4adb JB |
980 | |
981 | /* | |
f60d16a8 JM |
982 | * We need the same args as before, but with this substitution: |
983 | * s!subvol=[^,]+!subvolid=0! | |
830c4adb | 984 | * |
f60d16a8 JM |
985 | * Since the replacement string is up to 2 bytes longer than the |
986 | * original, allocate strlen(args) + 2 + 1 bytes. | |
830c4adb | 987 | */ |
830c4adb | 988 | |
f60d16a8 | 989 | src = strstr(args, "subvol="); |
830c4adb | 990 | /* This shouldn't happen, but just in case.. */ |
f60d16a8 JM |
991 | if (!src) |
992 | return NULL; | |
993 | ||
994 | buf = dst = kmalloc(len, GFP_NOFS); | |
995 | if (!buf) | |
830c4adb | 996 | return NULL; |
830c4adb JB |
997 | |
998 | /* | |
f60d16a8 JM |
999 | * If the subvol= arg is not at the start of the string, |
1000 | * copy whatever precedes it into buf. | |
830c4adb | 1001 | */ |
f60d16a8 JM |
1002 | if (src != args) { |
1003 | *src++ = '\0'; | |
1004 | strcpy(buf, args); | |
1005 | dst += strlen(args); | |
830c4adb JB |
1006 | } |
1007 | ||
f60d16a8 JM |
1008 | strcpy(dst, "subvolid=0"); |
1009 | dst += strlen("subvolid=0"); | |
830c4adb JB |
1010 | |
1011 | /* | |
f60d16a8 JM |
1012 | * If there is a "," after the original subvol=... string, |
1013 | * copy that suffix into our buffer. Otherwise, we're done. | |
830c4adb | 1014 | */ |
f60d16a8 JM |
1015 | src = strchr(src, ','); |
1016 | if (src) | |
1017 | strcpy(dst, src); | |
830c4adb | 1018 | |
f60d16a8 | 1019 | return buf; |
830c4adb JB |
1020 | } |
1021 | ||
1022 | static struct dentry *mount_subvol(const char *subvol_name, int flags, | |
1023 | const char *device_name, char *data) | |
1024 | { | |
830c4adb JB |
1025 | struct dentry *root; |
1026 | struct vfsmount *mnt; | |
830c4adb | 1027 | char *newargs; |
830c4adb JB |
1028 | |
1029 | newargs = setup_root_args(data); | |
1030 | if (!newargs) | |
1031 | return ERR_PTR(-ENOMEM); | |
1032 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, | |
1033 | newargs); | |
1034 | kfree(newargs); | |
1035 | if (IS_ERR(mnt)) | |
1036 | return ERR_CAST(mnt); | |
1037 | ||
ea441d11 | 1038 | root = mount_subtree(mnt, subvol_name); |
830c4adb | 1039 | |
ea441d11 AV |
1040 | if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { |
1041 | struct super_block *s = root->d_sb; | |
1042 | dput(root); | |
1043 | root = ERR_PTR(-EINVAL); | |
1044 | deactivate_locked_super(s); | |
f9d9ef62 DS |
1045 | printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n", |
1046 | subvol_name); | |
f9d9ef62 DS |
1047 | } |
1048 | ||
830c4adb JB |
1049 | return root; |
1050 | } | |
450ba0ea | 1051 | |
edf24abe CH |
1052 | /* |
1053 | * Find a superblock for the given device / mount point. | |
1054 | * | |
1055 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1056 | * for multiple device setup. Make sure to keep it in sync. | |
1057 | */ | |
061dbc6b | 1058 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1059 | const char *device_name, void *data) |
4b82d6e4 Y |
1060 | { |
1061 | struct block_device *bdev = NULL; | |
1062 | struct super_block *s; | |
1063 | struct dentry *root; | |
8a4b83cc | 1064 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 1065 | struct btrfs_fs_info *fs_info = NULL; |
97288f2c | 1066 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1067 | char *subvol_name = NULL; |
1068 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
1069 | int error = 0; |
1070 | ||
97288f2c CH |
1071 | if (!(flags & MS_RDONLY)) |
1072 | mode |= FMODE_WRITE; | |
1073 | ||
1074 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 1075 | &subvol_name, &subvol_objectid, |
5e2a4b25 | 1076 | &fs_devices); |
f23c8af8 ID |
1077 | if (error) { |
1078 | kfree(subvol_name); | |
061dbc6b | 1079 | return ERR_PTR(error); |
f23c8af8 | 1080 | } |
edf24abe | 1081 | |
830c4adb JB |
1082 | if (subvol_name) { |
1083 | root = mount_subvol(subvol_name, flags, device_name, data); | |
1084 | kfree(subvol_name); | |
1085 | return root; | |
1086 | } | |
1087 | ||
306e16ce | 1088 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 1089 | if (error) |
830c4adb | 1090 | return ERR_PTR(error); |
4b82d6e4 | 1091 | |
450ba0ea JB |
1092 | /* |
1093 | * Setup a dummy root and fs_info for test/set super. This is because | |
1094 | * we don't actually fill this stuff out until open_ctree, but we need | |
1095 | * it for searching for existing supers, so this lets us do that and | |
1096 | * then open_ctree will properly initialize everything later. | |
1097 | */ | |
1098 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
04d21a24 ID |
1099 | if (!fs_info) |
1100 | return ERR_PTR(-ENOMEM); | |
1101 | ||
450ba0ea | 1102 | fs_info->fs_devices = fs_devices; |
450ba0ea | 1103 | |
6c41761f DS |
1104 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
1105 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
1106 | if (!fs_info->super_copy || !fs_info->super_for_commit) { | |
1107 | error = -ENOMEM; | |
04d21a24 ID |
1108 | goto error_fs_info; |
1109 | } | |
1110 | ||
1111 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1112 | if (error) | |
1113 | goto error_fs_info; | |
1114 | ||
1115 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1116 | error = -EACCES; | |
6c41761f DS |
1117 | goto error_close_devices; |
1118 | } | |
1119 | ||
dfe25020 | 1120 | bdev = fs_devices->latest_bdev; |
9249e17f DH |
1121 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
1122 | fs_info); | |
830c4adb JB |
1123 | if (IS_ERR(s)) { |
1124 | error = PTR_ERR(s); | |
1125 | goto error_close_devices; | |
1126 | } | |
4b82d6e4 Y |
1127 | |
1128 | if (s->s_root) { | |
2b82032c | 1129 | btrfs_close_devices(fs_devices); |
6c41761f | 1130 | free_fs_info(fs_info); |
59553edf AV |
1131 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1132 | error = -EBUSY; | |
4b82d6e4 Y |
1133 | } else { |
1134 | char b[BDEVNAME_SIZE]; | |
1135 | ||
4b82d6e4 | 1136 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
815745cf | 1137 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1138 | error = btrfs_fill_super(s, fs_devices, data, |
1139 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 Y |
1140 | } |
1141 | ||
59553edf AV |
1142 | root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); |
1143 | if (IS_ERR(root)) | |
830c4adb | 1144 | deactivate_locked_super(s); |
4b82d6e4 | 1145 | |
061dbc6b | 1146 | return root; |
4b82d6e4 | 1147 | |
c146afad | 1148 | error_close_devices: |
8a4b83cc | 1149 | btrfs_close_devices(fs_devices); |
04d21a24 | 1150 | error_fs_info: |
6c41761f | 1151 | free_fs_info(fs_info); |
061dbc6b | 1152 | return ERR_PTR(error); |
4b82d6e4 | 1153 | } |
2e635a27 | 1154 | |
0d2450ab ST |
1155 | static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit) |
1156 | { | |
1157 | spin_lock_irq(&workers->lock); | |
1158 | workers->max_workers = new_limit; | |
1159 | spin_unlock_irq(&workers->lock); | |
1160 | } | |
1161 | ||
1162 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, | |
1163 | int new_pool_size, int old_pool_size) | |
1164 | { | |
1165 | if (new_pool_size == old_pool_size) | |
1166 | return; | |
1167 | ||
1168 | fs_info->thread_pool_size = new_pool_size; | |
1169 | ||
1170 | printk(KERN_INFO "btrfs: resize thread pool %d -> %d\n", | |
1171 | old_pool_size, new_pool_size); | |
1172 | ||
1173 | btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size); | |
1174 | btrfs_set_max_workers(&fs_info->workers, new_pool_size); | |
1175 | btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size); | |
1176 | btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size); | |
1177 | btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size); | |
1178 | btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size); | |
1179 | btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size); | |
1180 | btrfs_set_max_workers(&fs_info->endio_meta_workers, new_pool_size); | |
1181 | btrfs_set_max_workers(&fs_info->endio_meta_write_workers, new_pool_size); | |
1182 | btrfs_set_max_workers(&fs_info->endio_write_workers, new_pool_size); | |
1183 | btrfs_set_max_workers(&fs_info->endio_freespace_worker, new_pool_size); | |
1184 | btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size); | |
1185 | btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size); | |
ff023aac SB |
1186 | btrfs_set_max_workers(&fs_info->scrub_wr_completion_workers, |
1187 | new_pool_size); | |
0d2450ab ST |
1188 | } |
1189 | ||
f42a34b2 | 1190 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
dc81cdc5 MX |
1191 | { |
1192 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
f42a34b2 | 1193 | } |
dc81cdc5 | 1194 | |
f42a34b2 MX |
1195 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
1196 | unsigned long old_opts, int flags) | |
1197 | { | |
dc81cdc5 MX |
1198 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1199 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1200 | (flags & MS_RDONLY))) { | |
1201 | /* wait for any defraggers to finish */ | |
1202 | wait_event(fs_info->transaction_wait, | |
1203 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1204 | if (flags & MS_RDONLY) | |
1205 | sync_filesystem(fs_info->sb); | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1210 | unsigned long old_opts) | |
1211 | { | |
1212 | /* | |
1213 | * We need cleanup all defragable inodes if the autodefragment is | |
1214 | * close or the fs is R/O. | |
1215 | */ | |
1216 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1217 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1218 | (fs_info->sb->s_flags & MS_RDONLY))) { | |
1219 | btrfs_cleanup_defrag_inodes(fs_info); | |
1220 | } | |
1221 | ||
1222 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1223 | } | |
1224 | ||
c146afad YZ |
1225 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1226 | { | |
815745cf AV |
1227 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1228 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1229 | unsigned old_flags = sb->s_flags; |
1230 | unsigned long old_opts = fs_info->mount_opt; | |
1231 | unsigned long old_compress_type = fs_info->compress_type; | |
1232 | u64 old_max_inline = fs_info->max_inline; | |
1233 | u64 old_alloc_start = fs_info->alloc_start; | |
1234 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1235 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
c146afad YZ |
1236 | int ret; |
1237 | ||
f42a34b2 | 1238 | btrfs_remount_prepare(fs_info); |
dc81cdc5 | 1239 | |
b288052e | 1240 | ret = btrfs_parse_options(root, data); |
49b25e05 JM |
1241 | if (ret) { |
1242 | ret = -EINVAL; | |
1243 | goto restore; | |
1244 | } | |
b288052e | 1245 | |
f42a34b2 | 1246 | btrfs_remount_begin(fs_info, old_opts, *flags); |
0d2450ab ST |
1247 | btrfs_resize_thread_pool(fs_info, |
1248 | fs_info->thread_pool_size, old_thread_pool_size); | |
1249 | ||
c146afad | 1250 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
dc81cdc5 | 1251 | goto out; |
c146afad YZ |
1252 | |
1253 | if (*flags & MS_RDONLY) { | |
8dabb742 SB |
1254 | /* |
1255 | * this also happens on 'umount -rf' or on shutdown, when | |
1256 | * the filesystem is busy. | |
1257 | */ | |
c146afad YZ |
1258 | sb->s_flags |= MS_RDONLY; |
1259 | ||
8dabb742 SB |
1260 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1261 | btrfs_scrub_cancel(fs_info); | |
061594ef | 1262 | btrfs_pause_balance(fs_info); |
8dabb742 | 1263 | |
49b25e05 JM |
1264 | ret = btrfs_commit_super(root); |
1265 | if (ret) | |
1266 | goto restore; | |
c146afad | 1267 | } else { |
8a3db184 | 1268 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1269 | ret = -EACCES; |
1270 | goto restore; | |
8a3db184 | 1271 | } |
2b82032c | 1272 | |
292fd7fc SB |
1273 | if (fs_info->fs_devices->missing_devices > |
1274 | fs_info->num_tolerated_disk_barrier_failures && | |
1275 | !(*flags & MS_RDONLY)) { | |
1276 | printk(KERN_WARNING | |
1277 | "Btrfs: too many missing devices, writeable remount is not allowed\n"); | |
1278 | ret = -EACCES; | |
1279 | goto restore; | |
1280 | } | |
1281 | ||
8a3db184 | 1282 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1283 | ret = -EINVAL; |
1284 | goto restore; | |
8a3db184 | 1285 | } |
c146afad | 1286 | |
815745cf | 1287 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1288 | if (ret) |
1289 | goto restore; | |
c146afad | 1290 | |
d68fc57b YZ |
1291 | /* recover relocation */ |
1292 | ret = btrfs_recover_relocation(root); | |
49b25e05 JM |
1293 | if (ret) |
1294 | goto restore; | |
c146afad | 1295 | |
2b6ba629 ID |
1296 | ret = btrfs_resume_balance_async(fs_info); |
1297 | if (ret) | |
1298 | goto restore; | |
1299 | ||
8dabb742 SB |
1300 | ret = btrfs_resume_dev_replace_async(fs_info); |
1301 | if (ret) { | |
1302 | pr_warn("btrfs: failed to resume dev_replace\n"); | |
1303 | goto restore; | |
1304 | } | |
c146afad YZ |
1305 | sb->s_flags &= ~MS_RDONLY; |
1306 | } | |
dc81cdc5 MX |
1307 | out: |
1308 | btrfs_remount_cleanup(fs_info, old_opts); | |
c146afad | 1309 | return 0; |
49b25e05 JM |
1310 | |
1311 | restore: | |
1312 | /* We've hit an error - don't reset MS_RDONLY */ | |
1313 | if (sb->s_flags & MS_RDONLY) | |
1314 | old_flags |= MS_RDONLY; | |
1315 | sb->s_flags = old_flags; | |
1316 | fs_info->mount_opt = old_opts; | |
1317 | fs_info->compress_type = old_compress_type; | |
1318 | fs_info->max_inline = old_max_inline; | |
c018daec | 1319 | mutex_lock(&fs_info->chunk_mutex); |
49b25e05 | 1320 | fs_info->alloc_start = old_alloc_start; |
c018daec | 1321 | mutex_unlock(&fs_info->chunk_mutex); |
0d2450ab ST |
1322 | btrfs_resize_thread_pool(fs_info, |
1323 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 | 1324 | fs_info->metadata_ratio = old_metadata_ratio; |
dc81cdc5 | 1325 | btrfs_remount_cleanup(fs_info, old_opts); |
49b25e05 | 1326 | return ret; |
c146afad YZ |
1327 | } |
1328 | ||
bcd53741 AJ |
1329 | /* Used to sort the devices by max_avail(descending sort) */ |
1330 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1331 | const void *dev_info2) | |
1332 | { | |
1333 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1334 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1335 | return -1; | |
1336 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1337 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1338 | return 1; | |
1339 | else | |
1340 | return 0; | |
1341 | } | |
1342 | ||
1343 | /* | |
1344 | * sort the devices by max_avail, in which max free extent size of each device | |
1345 | * is stored.(Descending Sort) | |
1346 | */ | |
1347 | static inline void btrfs_descending_sort_devices( | |
1348 | struct btrfs_device_info *devices, | |
1349 | size_t nr_devices) | |
1350 | { | |
1351 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1352 | btrfs_cmp_device_free_bytes, NULL); | |
1353 | } | |
1354 | ||
6d07bcec MX |
1355 | /* |
1356 | * The helper to calc the free space on the devices that can be used to store | |
1357 | * file data. | |
1358 | */ | |
1359 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1360 | { | |
1361 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1362 | struct btrfs_device_info *devices_info; | |
1363 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1364 | struct btrfs_device *device; | |
1365 | u64 skip_space; | |
1366 | u64 type; | |
1367 | u64 avail_space; | |
1368 | u64 used_space; | |
1369 | u64 min_stripe_size; | |
39fb26c3 | 1370 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1371 | int i = 0, nr_devices; |
1372 | int ret; | |
1373 | ||
b772a86e | 1374 | nr_devices = fs_info->fs_devices->open_devices; |
6d07bcec MX |
1375 | BUG_ON(!nr_devices); |
1376 | ||
1377 | devices_info = kmalloc(sizeof(*devices_info) * nr_devices, | |
1378 | GFP_NOFS); | |
1379 | if (!devices_info) | |
1380 | return -ENOMEM; | |
1381 | ||
1382 | /* calc min stripe number for data space alloction */ | |
1383 | type = btrfs_get_alloc_profile(root, 1); | |
39fb26c3 | 1384 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1385 | min_stripes = 2; |
39fb26c3 MX |
1386 | num_stripes = nr_devices; |
1387 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1388 | min_stripes = 2; |
39fb26c3 MX |
1389 | num_stripes = 2; |
1390 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1391 | min_stripes = 4; |
39fb26c3 MX |
1392 | num_stripes = 4; |
1393 | } | |
6d07bcec MX |
1394 | |
1395 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1396 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1397 | else | |
1398 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1399 | ||
b772a86e | 1400 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
63a212ab SB |
1401 | if (!device->in_fs_metadata || !device->bdev || |
1402 | device->is_tgtdev_for_dev_replace) | |
6d07bcec MX |
1403 | continue; |
1404 | ||
1405 | avail_space = device->total_bytes - device->bytes_used; | |
1406 | ||
1407 | /* align with stripe_len */ | |
1408 | do_div(avail_space, BTRFS_STRIPE_LEN); | |
1409 | avail_space *= BTRFS_STRIPE_LEN; | |
1410 | ||
1411 | /* | |
1412 | * In order to avoid overwritting the superblock on the drive, | |
1413 | * btrfs starts at an offset of at least 1MB when doing chunk | |
1414 | * allocation. | |
1415 | */ | |
1416 | skip_space = 1024 * 1024; | |
1417 | ||
1418 | /* user can set the offset in fs_info->alloc_start. */ | |
1419 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1420 | device->total_bytes) | |
1421 | skip_space = max(fs_info->alloc_start, skip_space); | |
1422 | ||
1423 | /* | |
1424 | * btrfs can not use the free space in [0, skip_space - 1], | |
1425 | * we must subtract it from the total. In order to implement | |
1426 | * it, we account the used space in this range first. | |
1427 | */ | |
1428 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, | |
1429 | &used_space); | |
1430 | if (ret) { | |
1431 | kfree(devices_info); | |
1432 | return ret; | |
1433 | } | |
1434 | ||
1435 | /* calc the free space in [0, skip_space - 1] */ | |
1436 | skip_space -= used_space; | |
1437 | ||
1438 | /* | |
1439 | * we can use the free space in [0, skip_space - 1], subtract | |
1440 | * it from the total. | |
1441 | */ | |
1442 | if (avail_space && avail_space >= skip_space) | |
1443 | avail_space -= skip_space; | |
1444 | else | |
1445 | avail_space = 0; | |
1446 | ||
1447 | if (avail_space < min_stripe_size) | |
1448 | continue; | |
1449 | ||
1450 | devices_info[i].dev = device; | |
1451 | devices_info[i].max_avail = avail_space; | |
1452 | ||
1453 | i++; | |
1454 | } | |
1455 | ||
1456 | nr_devices = i; | |
1457 | ||
1458 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1459 | ||
1460 | i = nr_devices - 1; | |
1461 | avail_space = 0; | |
1462 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
1463 | if (num_stripes > nr_devices) |
1464 | num_stripes = nr_devices; | |
1465 | ||
6d07bcec MX |
1466 | if (devices_info[i].max_avail >= min_stripe_size) { |
1467 | int j; | |
1468 | u64 alloc_size; | |
1469 | ||
39fb26c3 | 1470 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 1471 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 1472 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
1473 | devices_info[j].max_avail -= alloc_size; |
1474 | } | |
1475 | i--; | |
1476 | nr_devices--; | |
1477 | } | |
1478 | ||
1479 | kfree(devices_info); | |
1480 | *free_bytes = avail_space; | |
1481 | return 0; | |
1482 | } | |
1483 | ||
8fd17795 CM |
1484 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1485 | { | |
815745cf AV |
1486 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
1487 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
1488 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
1489 | struct btrfs_space_info *found; |
1490 | u64 total_used = 0; | |
6d07bcec | 1491 | u64 total_free_data = 0; |
db94535d | 1492 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 1493 | __be32 *fsid = (__be32 *)fs_info->fsid; |
6d07bcec | 1494 | int ret; |
8fd17795 | 1495 | |
6d07bcec | 1496 | /* holding chunk_muext to avoid allocating new chunks */ |
815745cf | 1497 | mutex_lock(&fs_info->chunk_mutex); |
bd4d1088 | 1498 | rcu_read_lock(); |
89a55897 | 1499 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec MX |
1500 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
1501 | total_free_data += found->disk_total - found->disk_used; | |
1502 | total_free_data -= | |
1503 | btrfs_account_ro_block_groups_free_space(found); | |
1504 | } | |
1505 | ||
b742bb82 | 1506 | total_used += found->disk_used; |
89a55897 | 1507 | } |
bd4d1088 JB |
1508 | rcu_read_unlock(); |
1509 | ||
8fd17795 | 1510 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 1511 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 | 1512 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
8fd17795 CM |
1513 | buf->f_bsize = dentry->d_sb->s_blocksize; |
1514 | buf->f_type = BTRFS_SUPER_MAGIC; | |
6d07bcec | 1515 | buf->f_bavail = total_free_data; |
815745cf | 1516 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
6d07bcec | 1517 | if (ret) { |
815745cf | 1518 | mutex_unlock(&fs_info->chunk_mutex); |
6d07bcec MX |
1519 | return ret; |
1520 | } | |
1521 | buf->f_bavail += total_free_data; | |
1522 | buf->f_bavail = buf->f_bavail >> bits; | |
815745cf | 1523 | mutex_unlock(&fs_info->chunk_mutex); |
d397712b | 1524 | |
9d03632e | 1525 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 1526 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
1527 | on a big-endian or little-endian host */ |
1528 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
1529 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
1530 | /* Mask in the root object ID too, to disambiguate subvols */ |
1531 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
1532 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
1533 | ||
8fd17795 CM |
1534 | return 0; |
1535 | } | |
b5133862 | 1536 | |
aea52e19 AV |
1537 | static void btrfs_kill_super(struct super_block *sb) |
1538 | { | |
815745cf | 1539 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 1540 | kill_anon_super(sb); |
d22ca7de | 1541 | free_fs_info(fs_info); |
aea52e19 AV |
1542 | } |
1543 | ||
2e635a27 CM |
1544 | static struct file_system_type btrfs_fs_type = { |
1545 | .owner = THIS_MODULE, | |
1546 | .name = "btrfs", | |
061dbc6b | 1547 | .mount = btrfs_mount, |
aea52e19 | 1548 | .kill_sb = btrfs_kill_super, |
2e635a27 CM |
1549 | .fs_flags = FS_REQUIRES_DEV, |
1550 | }; | |
7f78e035 | 1551 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 1552 | |
d352ac68 CM |
1553 | /* |
1554 | * used by btrfsctl to scan devices when no FS is mounted | |
1555 | */ | |
8a4b83cc CM |
1556 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
1557 | unsigned long arg) | |
1558 | { | |
1559 | struct btrfs_ioctl_vol_args *vol; | |
1560 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 1561 | int ret = -ENOTTY; |
8a4b83cc | 1562 | |
e441d54d CM |
1563 | if (!capable(CAP_SYS_ADMIN)) |
1564 | return -EPERM; | |
1565 | ||
dae7b665 LZ |
1566 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
1567 | if (IS_ERR(vol)) | |
1568 | return PTR_ERR(vol); | |
c071fcfd | 1569 | |
8a4b83cc CM |
1570 | switch (cmd) { |
1571 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 1572 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
1573 | &btrfs_fs_type, &fs_devices); |
1574 | break; | |
02db0844 JB |
1575 | case BTRFS_IOC_DEVICES_READY: |
1576 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
1577 | &btrfs_fs_type, &fs_devices); | |
1578 | if (ret) | |
1579 | break; | |
1580 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
1581 | break; | |
8a4b83cc | 1582 | } |
dae7b665 | 1583 | |
8a4b83cc | 1584 | kfree(vol); |
f819d837 | 1585 | return ret; |
8a4b83cc CM |
1586 | } |
1587 | ||
0176260f | 1588 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 1589 | { |
354aa0fb MX |
1590 | struct btrfs_trans_handle *trans; |
1591 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
1592 | ||
d4edf39b | 1593 | trans = btrfs_attach_transaction_barrier(root); |
354aa0fb MX |
1594 | if (IS_ERR(trans)) { |
1595 | /* no transaction, don't bother */ | |
1596 | if (PTR_ERR(trans) == -ENOENT) | |
1597 | return 0; | |
1598 | return PTR_ERR(trans); | |
1599 | } | |
1600 | return btrfs_commit_transaction(trans, root); | |
ed0dab6b Y |
1601 | } |
1602 | ||
0176260f | 1603 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b | 1604 | { |
0176260f | 1605 | return 0; |
ed0dab6b | 1606 | } |
2e635a27 | 1607 | |
9c5085c1 JB |
1608 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
1609 | { | |
1610 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
1611 | struct btrfs_fs_devices *cur_devices; | |
1612 | struct btrfs_device *dev, *first_dev = NULL; | |
1613 | struct list_head *head; | |
1614 | struct rcu_string *name; | |
1615 | ||
1616 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
1617 | cur_devices = fs_info->fs_devices; | |
1618 | while (cur_devices) { | |
1619 | head = &cur_devices->devices; | |
1620 | list_for_each_entry(dev, head, dev_list) { | |
aa9ddcd4 JB |
1621 | if (dev->missing) |
1622 | continue; | |
9c5085c1 JB |
1623 | if (!first_dev || dev->devid < first_dev->devid) |
1624 | first_dev = dev; | |
1625 | } | |
1626 | cur_devices = cur_devices->seed; | |
1627 | } | |
1628 | ||
1629 | if (first_dev) { | |
1630 | rcu_read_lock(); | |
1631 | name = rcu_dereference(first_dev->name); | |
1632 | seq_escape(m, name->str, " \t\n\\"); | |
1633 | rcu_read_unlock(); | |
1634 | } else { | |
1635 | WARN_ON(1); | |
1636 | } | |
1637 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
1638 | return 0; | |
1639 | } | |
1640 | ||
b87221de | 1641 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 1642 | .drop_inode = btrfs_drop_inode, |
bd555975 | 1643 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 1644 | .put_super = btrfs_put_super, |
d5719762 | 1645 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 1646 | .show_options = btrfs_show_options, |
9c5085c1 | 1647 | .show_devname = btrfs_show_devname, |
4730a4bc | 1648 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
1649 | .alloc_inode = btrfs_alloc_inode, |
1650 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 1651 | .statfs = btrfs_statfs, |
c146afad | 1652 | .remount_fs = btrfs_remount, |
0176260f LT |
1653 | .freeze_fs = btrfs_freeze, |
1654 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 1655 | }; |
a9218f6b CM |
1656 | |
1657 | static const struct file_operations btrfs_ctl_fops = { | |
1658 | .unlocked_ioctl = btrfs_control_ioctl, | |
1659 | .compat_ioctl = btrfs_control_ioctl, | |
1660 | .owner = THIS_MODULE, | |
6038f373 | 1661 | .llseek = noop_llseek, |
a9218f6b CM |
1662 | }; |
1663 | ||
1664 | static struct miscdevice btrfs_misc = { | |
578454ff | 1665 | .minor = BTRFS_MINOR, |
a9218f6b CM |
1666 | .name = "btrfs-control", |
1667 | .fops = &btrfs_ctl_fops | |
1668 | }; | |
1669 | ||
578454ff KS |
1670 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
1671 | MODULE_ALIAS("devname:btrfs-control"); | |
1672 | ||
a9218f6b CM |
1673 | static int btrfs_interface_init(void) |
1674 | { | |
1675 | return misc_register(&btrfs_misc); | |
1676 | } | |
1677 | ||
b2950863 | 1678 | static void btrfs_interface_exit(void) |
a9218f6b CM |
1679 | { |
1680 | if (misc_deregister(&btrfs_misc) < 0) | |
48940662 | 1681 | printk(KERN_INFO "btrfs: misc_deregister failed for control device\n"); |
a9218f6b CM |
1682 | } |
1683 | ||
85965600 DS |
1684 | static void btrfs_print_info(void) |
1685 | { | |
1686 | printk(KERN_INFO "Btrfs loaded" | |
1687 | #ifdef CONFIG_BTRFS_DEBUG | |
1688 | ", debug=on" | |
1689 | #endif | |
1690 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
1691 | ", integrity-checker=on" | |
1692 | #endif | |
1693 | "\n"); | |
1694 | } | |
1695 | ||
2e635a27 CM |
1696 | static int __init init_btrfs_fs(void) |
1697 | { | |
2c90e5d6 | 1698 | int err; |
58176a96 JB |
1699 | |
1700 | err = btrfs_init_sysfs(); | |
1701 | if (err) | |
1702 | return err; | |
1703 | ||
143bede5 | 1704 | btrfs_init_compress(); |
d1310b2e | 1705 | |
261507a0 LZ |
1706 | err = btrfs_init_cachep(); |
1707 | if (err) | |
1708 | goto free_compress; | |
1709 | ||
d1310b2e | 1710 | err = extent_io_init(); |
2f4cbe64 WB |
1711 | if (err) |
1712 | goto free_cachep; | |
1713 | ||
d1310b2e CM |
1714 | err = extent_map_init(); |
1715 | if (err) | |
1716 | goto free_extent_io; | |
1717 | ||
6352b91d | 1718 | err = ordered_data_init(); |
2f4cbe64 WB |
1719 | if (err) |
1720 | goto free_extent_map; | |
c8b97818 | 1721 | |
6352b91d MX |
1722 | err = btrfs_delayed_inode_init(); |
1723 | if (err) | |
1724 | goto free_ordered_data; | |
1725 | ||
9247f317 | 1726 | err = btrfs_auto_defrag_init(); |
16cdcec7 MX |
1727 | if (err) |
1728 | goto free_delayed_inode; | |
1729 | ||
78a6184a | 1730 | err = btrfs_delayed_ref_init(); |
9247f317 MX |
1731 | if (err) |
1732 | goto free_auto_defrag; | |
1733 | ||
78a6184a MX |
1734 | err = btrfs_interface_init(); |
1735 | if (err) | |
1736 | goto free_delayed_ref; | |
1737 | ||
a9218f6b CM |
1738 | err = register_filesystem(&btrfs_fs_type); |
1739 | if (err) | |
1740 | goto unregister_ioctl; | |
b3c3da71 | 1741 | |
e565d4b9 JS |
1742 | btrfs_init_lockdep(); |
1743 | ||
85965600 | 1744 | btrfs_print_info(); |
74255aa0 | 1745 | btrfs_test_free_space_cache(); |
74255aa0 | 1746 | |
2f4cbe64 WB |
1747 | return 0; |
1748 | ||
a9218f6b CM |
1749 | unregister_ioctl: |
1750 | btrfs_interface_exit(); | |
78a6184a MX |
1751 | free_delayed_ref: |
1752 | btrfs_delayed_ref_exit(); | |
9247f317 MX |
1753 | free_auto_defrag: |
1754 | btrfs_auto_defrag_exit(); | |
16cdcec7 MX |
1755 | free_delayed_inode: |
1756 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
1757 | free_ordered_data: |
1758 | ordered_data_exit(); | |
2f4cbe64 WB |
1759 | free_extent_map: |
1760 | extent_map_exit(); | |
d1310b2e CM |
1761 | free_extent_io: |
1762 | extent_io_exit(); | |
2f4cbe64 WB |
1763 | free_cachep: |
1764 | btrfs_destroy_cachep(); | |
261507a0 LZ |
1765 | free_compress: |
1766 | btrfs_exit_compress(); | |
2f4cbe64 WB |
1767 | btrfs_exit_sysfs(); |
1768 | return err; | |
2e635a27 CM |
1769 | } |
1770 | ||
1771 | static void __exit exit_btrfs_fs(void) | |
1772 | { | |
39279cc3 | 1773 | btrfs_destroy_cachep(); |
78a6184a | 1774 | btrfs_delayed_ref_exit(); |
9247f317 | 1775 | btrfs_auto_defrag_exit(); |
16cdcec7 | 1776 | btrfs_delayed_inode_exit(); |
6352b91d | 1777 | ordered_data_exit(); |
a52d9a80 | 1778 | extent_map_exit(); |
d1310b2e | 1779 | extent_io_exit(); |
a9218f6b | 1780 | btrfs_interface_exit(); |
2e635a27 | 1781 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 1782 | btrfs_exit_sysfs(); |
8a4b83cc | 1783 | btrfs_cleanup_fs_uuids(); |
261507a0 | 1784 | btrfs_exit_compress(); |
2e635a27 CM |
1785 | } |
1786 | ||
1787 | module_init(init_btrfs_fs) | |
1788 | module_exit(exit_btrfs_fs) | |
1789 | ||
1790 | MODULE_LICENSE("GPL"); |