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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
4b82d6e4 | 19 | #include <linux/blkdev.h> |
2e635a27 | 20 | #include <linux/module.h> |
e20d96d6 | 21 | #include <linux/buffer_head.h> |
2e635a27 CM |
22 | #include <linux/fs.h> |
23 | #include <linux/pagemap.h> | |
24 | #include <linux/highmem.h> | |
25 | #include <linux/time.h> | |
26 | #include <linux/init.h> | |
a9572a15 | 27 | #include <linux/seq_file.h> |
2e635a27 | 28 | #include <linux/string.h> |
2e635a27 | 29 | #include <linux/backing-dev.h> |
4b82d6e4 | 30 | #include <linux/mount.h> |
dee26a9f | 31 | #include <linux/mpage.h> |
75dfe396 CM |
32 | #include <linux/swap.h> |
33 | #include <linux/writeback.h> | |
8fd17795 | 34 | #include <linux/statfs.h> |
08607c1b | 35 | #include <linux/compat.h> |
95e05289 | 36 | #include <linux/parser.h> |
c59f8951 | 37 | #include <linux/ctype.h> |
6da6abae | 38 | #include <linux/namei.h> |
a9218f6b | 39 | #include <linux/miscdevice.h> |
1bcbf313 | 40 | #include <linux/magic.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
90a887c9 | 42 | #include <linux/cleancache.h> |
22c44fe6 | 43 | #include <linux/ratelimit.h> |
55e301fd | 44 | #include <linux/btrfs.h> |
16cdcec7 | 45 | #include "delayed-inode.h" |
2e635a27 | 46 | #include "ctree.h" |
e20d96d6 | 47 | #include "disk-io.h" |
d5719762 | 48 | #include "transaction.h" |
2c90e5d6 | 49 | #include "btrfs_inode.h" |
3a686375 | 50 | #include "print-tree.h" |
14a958e6 | 51 | #include "hash.h" |
63541927 | 52 | #include "props.h" |
5103e947 | 53 | #include "xattr.h" |
8a4b83cc | 54 | #include "volumes.h" |
be6e8dc0 | 55 | #include "export.h" |
c8b97818 | 56 | #include "compression.h" |
9c5085c1 | 57 | #include "rcu-string.h" |
8dabb742 | 58 | #include "dev-replace.h" |
74255aa0 | 59 | #include "free-space-cache.h" |
b9e9a6cb | 60 | #include "backref.h" |
dc11dd5d | 61 | #include "tests/btrfs-tests.h" |
2e635a27 | 62 | |
d3982100 | 63 | #include "qgroup.h" |
1abe9b8a | 64 | #define CREATE_TRACE_POINTS |
65 | #include <trace/events/btrfs.h> | |
66 | ||
b87221de | 67 | static const struct super_operations btrfs_super_ops; |
830c4adb | 68 | static struct file_system_type btrfs_fs_type; |
75dfe396 | 69 | |
0723a047 HH |
70 | static int btrfs_remount(struct super_block *sb, int *flags, char *data); |
71 | ||
e33e17ee | 72 | const char *btrfs_decode_error(int errno) |
acce952b | 73 | { |
08748810 | 74 | char *errstr = "unknown"; |
acce952b | 75 | |
76 | switch (errno) { | |
77 | case -EIO: | |
78 | errstr = "IO failure"; | |
79 | break; | |
80 | case -ENOMEM: | |
81 | errstr = "Out of memory"; | |
82 | break; | |
83 | case -EROFS: | |
84 | errstr = "Readonly filesystem"; | |
85 | break; | |
8c342930 JM |
86 | case -EEXIST: |
87 | errstr = "Object already exists"; | |
88 | break; | |
94ef7280 DS |
89 | case -ENOSPC: |
90 | errstr = "No space left"; | |
91 | break; | |
92 | case -ENOENT: | |
93 | errstr = "No such entry"; | |
94 | break; | |
acce952b | 95 | } |
96 | ||
97 | return errstr; | |
98 | } | |
99 | ||
acce952b | 100 | /* btrfs handle error by forcing the filesystem readonly */ |
101 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) | |
102 | { | |
103 | struct super_block *sb = fs_info->sb; | |
104 | ||
105 | if (sb->s_flags & MS_RDONLY) | |
106 | return; | |
107 | ||
87533c47 | 108 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
acce952b | 109 | sb->s_flags |= MS_RDONLY; |
c2cf52eb | 110 | btrfs_info(fs_info, "forced readonly"); |
1acd6831 SB |
111 | /* |
112 | * Note that a running device replace operation is not | |
113 | * canceled here although there is no way to update | |
114 | * the progress. It would add the risk of a deadlock, | |
01327610 | 115 | * therefore the canceling is omitted. The only penalty |
1acd6831 SB |
116 | * is that some I/O remains active until the procedure |
117 | * completes. The next time when the filesystem is | |
118 | * mounted writeable again, the device replace | |
119 | * operation continues. | |
120 | */ | |
acce952b | 121 | } |
122 | } | |
123 | ||
124 | /* | |
34d97007 | 125 | * __btrfs_handle_fs_error decodes expected errors from the caller and |
acce952b | 126 | * invokes the approciate error response. |
127 | */ | |
c0d19e2b | 128 | __cold |
34d97007 | 129 | void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, |
4da35113 | 130 | unsigned int line, int errno, const char *fmt, ...) |
acce952b | 131 | { |
132 | struct super_block *sb = fs_info->sb; | |
57d816a1 | 133 | #ifdef CONFIG_PRINTK |
acce952b | 134 | const char *errstr; |
57d816a1 | 135 | #endif |
acce952b | 136 | |
137 | /* | |
138 | * Special case: if the error is EROFS, and we're already | |
139 | * under MS_RDONLY, then it is safe here. | |
140 | */ | |
141 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
4da35113 JM |
142 | return; |
143 | ||
57d816a1 | 144 | #ifdef CONFIG_PRINTK |
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 | |
efe120a0 FH |
154 | printk(KERN_CRIT |
155 | "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", | |
08748810 | 156 | sb->s_id, function, line, errno, errstr, &vaf); |
37252a66 | 157 | va_end(args); |
4da35113 | 158 | } else { |
efe120a0 | 159 | printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", |
08748810 | 160 | sb->s_id, function, line, errno, errstr); |
4da35113 | 161 | } |
57d816a1 | 162 | #endif |
acce952b | 163 | |
0713d90c AJ |
164 | /* |
165 | * Today we only save the error info to memory. Long term we'll | |
166 | * also send it down to the disk | |
167 | */ | |
168 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); | |
169 | ||
4da35113 | 170 | /* Don't go through full error handling during mount */ |
cf79ffb5 | 171 | if (sb->s_flags & MS_BORN) |
4da35113 | 172 | btrfs_handle_error(fs_info); |
4da35113 | 173 | } |
acce952b | 174 | |
57d816a1 | 175 | #ifdef CONFIG_PRINTK |
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 | ||
35f4e5e6 NB |
187 | |
188 | /* | |
189 | * Use one ratelimit state per log level so that a flood of less important | |
190 | * messages doesn't cause more important ones to be dropped. | |
191 | */ | |
192 | static struct ratelimit_state printk_limits[] = { | |
193 | RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100), | |
194 | RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100), | |
195 | RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100), | |
196 | RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100), | |
197 | RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100), | |
198 | RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100), | |
199 | RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100), | |
200 | RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100), | |
201 | }; | |
202 | ||
c2cf52eb | 203 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
4da35113 JM |
204 | { |
205 | struct super_block *sb = fs_info->sb; | |
206 | char lvl[4]; | |
207 | struct va_format vaf; | |
208 | va_list args; | |
209 | const char *type = logtypes[4]; | |
533574c6 | 210 | int kern_level; |
35f4e5e6 | 211 | struct ratelimit_state *ratelimit; |
4da35113 JM |
212 | |
213 | va_start(args, fmt); | |
214 | ||
533574c6 JP |
215 | kern_level = printk_get_level(fmt); |
216 | if (kern_level) { | |
217 | size_t size = printk_skip_level(fmt) - fmt; | |
218 | memcpy(lvl, fmt, size); | |
219 | lvl[size] = '\0'; | |
220 | fmt += size; | |
221 | type = logtypes[kern_level - '0']; | |
35f4e5e6 NB |
222 | ratelimit = &printk_limits[kern_level - '0']; |
223 | } else { | |
4da35113 | 224 | *lvl = '\0'; |
35f4e5e6 NB |
225 | /* Default to debug output */ |
226 | ratelimit = &printk_limits[7]; | |
227 | } | |
4da35113 JM |
228 | |
229 | vaf.fmt = fmt; | |
230 | vaf.va = &args; | |
533574c6 | 231 | |
35f4e5e6 NB |
232 | if (__ratelimit(ratelimit)) |
233 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); | |
533574c6 JP |
234 | |
235 | va_end(args); | |
236 | } | |
533574c6 | 237 | #endif |
acce952b | 238 | |
49b25e05 JM |
239 | /* |
240 | * We only mark the transaction aborted and then set the file system read-only. | |
241 | * This will prevent new transactions from starting or trying to join this | |
242 | * one. | |
243 | * | |
244 | * This means that error recovery at the call site is limited to freeing | |
245 | * any local memory allocations and passing the error code up without | |
246 | * further cleanup. The transaction should complete as it normally would | |
247 | * in the call path but will return -EIO. | |
248 | * | |
249 | * We'll complete the cleanup in btrfs_end_transaction and | |
250 | * btrfs_commit_transaction. | |
251 | */ | |
c0d19e2b | 252 | __cold |
49b25e05 | 253 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, |
66642832 | 254 | const char *function, |
49b25e05 JM |
255 | unsigned int line, int errno) |
256 | { | |
66642832 JM |
257 | struct btrfs_fs_info *fs_info = trans->fs_info; |
258 | ||
49b25e05 JM |
259 | trans->aborted = errno; |
260 | /* Nothing used. The other threads that have joined this | |
261 | * transaction may be able to continue. */ | |
64c12921 | 262 | if (!trans->dirty && list_empty(&trans->new_bgs)) { |
69ce977a MX |
263 | const char *errstr; |
264 | ||
08748810 | 265 | errstr = btrfs_decode_error(errno); |
66642832 | 266 | btrfs_warn(fs_info, |
c2cf52eb SK |
267 | "%s:%d: Aborting unused transaction(%s).", |
268 | function, line, errstr); | |
acce952b | 269 | return; |
49b25e05 | 270 | } |
8d25a086 | 271 | ACCESS_ONCE(trans->transaction->aborted) = errno; |
501407aa | 272 | /* Wake up anybody who may be waiting on this transaction */ |
66642832 JM |
273 | wake_up(&fs_info->transaction_wait); |
274 | wake_up(&fs_info->transaction_blocked_wait); | |
275 | __btrfs_handle_fs_error(fs_info, function, line, errno, NULL); | |
49b25e05 | 276 | } |
8c342930 JM |
277 | /* |
278 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
279 | * issues an alert, and either panics or BUGs, depending on mount options. | |
280 | */ | |
c0d19e2b | 281 | __cold |
8c342930 JM |
282 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, |
283 | unsigned int line, int errno, const char *fmt, ...) | |
284 | { | |
8c342930 JM |
285 | char *s_id = "<unknown>"; |
286 | const char *errstr; | |
287 | struct va_format vaf = { .fmt = fmt }; | |
288 | va_list args; | |
acce952b | 289 | |
8c342930 JM |
290 | if (fs_info) |
291 | s_id = fs_info->sb->s_id; | |
acce952b | 292 | |
8c342930 JM |
293 | va_start(args, fmt); |
294 | vaf.va = &args; | |
295 | ||
08748810 | 296 | errstr = btrfs_decode_error(errno); |
aa43a17c | 297 | if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) |
08748810 DS |
298 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
299 | s_id, function, line, &vaf, errno, errstr); | |
8c342930 | 300 | |
efe120a0 FH |
301 | btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", |
302 | function, line, &vaf, errno, errstr); | |
8c342930 JM |
303 | va_end(args); |
304 | /* Caller calls BUG() */ | |
acce952b | 305 | } |
306 | ||
d397712b | 307 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 308 | { |
3abdbd78 | 309 | close_ctree(btrfs_sb(sb)->tree_root); |
75dfe396 CM |
310 | } |
311 | ||
95e05289 | 312 | enum { |
73f73415 | 313 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
314 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
315 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
261507a0 LZ |
316 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
317 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
70f6d82e OS |
318 | Opt_space_cache, Opt_space_cache_version, Opt_clear_cache, |
319 | Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid, | |
320 | Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery, | |
321 | Opt_skip_balance, Opt_check_integrity, | |
322 | Opt_check_integrity_including_extent_data, | |
f420ee1e | 323 | Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, |
e07a2ade | 324 | Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, |
a258af7a | 325 | Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, |
8dcddfa0 | 326 | Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot, |
fed8f166 | 327 | Opt_nologreplay, Opt_norecovery, |
d0bd4560 JB |
328 | #ifdef CONFIG_BTRFS_DEBUG |
329 | Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, | |
330 | #endif | |
9555c6c1 | 331 | Opt_err, |
95e05289 CM |
332 | }; |
333 | ||
4d4ab6d6 | 334 | static const match_table_t tokens = { |
dfe25020 | 335 | {Opt_degraded, "degraded"}, |
95e05289 | 336 | {Opt_subvol, "subvol=%s"}, |
1493381f | 337 | {Opt_subvolid, "subvolid=%s"}, |
43e570b0 | 338 | {Opt_device, "device=%s"}, |
b6cda9bc | 339 | {Opt_nodatasum, "nodatasum"}, |
d399167d | 340 | {Opt_datasum, "datasum"}, |
be20aa9d | 341 | {Opt_nodatacow, "nodatacow"}, |
a258af7a | 342 | {Opt_datacow, "datacow"}, |
21ad10cf | 343 | {Opt_nobarrier, "nobarrier"}, |
842bef58 | 344 | {Opt_barrier, "barrier"}, |
6f568d35 | 345 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 346 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 347 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 348 | {Opt_compress, "compress"}, |
261507a0 | 349 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 350 | {Opt_compress_force, "compress-force"}, |
261507a0 | 351 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 352 | {Opt_ssd, "ssd"}, |
451d7585 | 353 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 354 | {Opt_nossd, "nossd"}, |
bd0330ad | 355 | {Opt_acl, "acl"}, |
33268eaf | 356 | {Opt_noacl, "noacl"}, |
3a5e1404 | 357 | {Opt_notreelog, "notreelog"}, |
a88998f2 | 358 | {Opt_treelog, "treelog"}, |
96da0919 | 359 | {Opt_nologreplay, "nologreplay"}, |
fed8f166 | 360 | {Opt_norecovery, "norecovery"}, |
dccae999 | 361 | {Opt_flushoncommit, "flushoncommit"}, |
2c9ee856 | 362 | {Opt_noflushoncommit, "noflushoncommit"}, |
97e728d4 | 363 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 364 | {Opt_discard, "discard"}, |
e07a2ade | 365 | {Opt_nodiscard, "nodiscard"}, |
0af3d00b | 366 | {Opt_space_cache, "space_cache"}, |
70f6d82e | 367 | {Opt_space_cache_version, "space_cache=%s"}, |
88c2ba3b | 368 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 369 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 370 | {Opt_enospc_debug, "enospc_debug"}, |
53036293 | 371 | {Opt_noenospc_debug, "noenospc_debug"}, |
e15d0542 | 372 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 373 | {Opt_defrag, "autodefrag"}, |
fc0ca9af | 374 | {Opt_nodefrag, "noautodefrag"}, |
4b9465cb | 375 | {Opt_inode_cache, "inode_cache"}, |
3818aea2 | 376 | {Opt_noinode_cache, "noinode_cache"}, |
8965593e | 377 | {Opt_no_space_cache, "nospace_cache"}, |
8dcddfa0 QW |
378 | {Opt_recovery, "recovery"}, /* deprecated */ |
379 | {Opt_usebackuproot, "usebackuproot"}, | |
9555c6c1 | 380 | {Opt_skip_balance, "skip_balance"}, |
21adbd5c SB |
381 | {Opt_check_integrity, "check_int"}, |
382 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
383 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, | |
f420ee1e | 384 | {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, |
8c342930 | 385 | {Opt_fatal_errors, "fatal_errors=%s"}, |
8b87dc17 | 386 | {Opt_commit_interval, "commit=%d"}, |
d0bd4560 JB |
387 | #ifdef CONFIG_BTRFS_DEBUG |
388 | {Opt_fragment_data, "fragment=data"}, | |
389 | {Opt_fragment_metadata, "fragment=metadata"}, | |
390 | {Opt_fragment_all, "fragment=all"}, | |
391 | #endif | |
33268eaf | 392 | {Opt_err, NULL}, |
95e05289 CM |
393 | }; |
394 | ||
edf24abe CH |
395 | /* |
396 | * Regular mount options parser. Everything that is needed only when | |
397 | * reading in a new superblock is parsed here. | |
49b25e05 | 398 | * XXX JDM: This needs to be cleaned up for remount. |
edf24abe | 399 | */ |
96da0919 QW |
400 | int btrfs_parse_options(struct btrfs_root *root, char *options, |
401 | unsigned long new_flags) | |
95e05289 | 402 | { |
edf24abe | 403 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 404 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
405 | char *p, *num, *orig = NULL; |
406 | u64 cache_gen; | |
4543df7e | 407 | int intarg; |
a7a3f7ca | 408 | int ret = 0; |
261507a0 LZ |
409 | char *compress_type; |
410 | bool compress_force = false; | |
b7c47bbb TI |
411 | enum btrfs_compression_type saved_compress_type; |
412 | bool saved_compress_force; | |
413 | int no_compress = 0; | |
b6cda9bc | 414 | |
6c41761f | 415 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
70f6d82e OS |
416 | if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE)) |
417 | btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); | |
418 | else if (cache_gen) | |
73bc1876 JB |
419 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
420 | ||
96da0919 QW |
421 | /* |
422 | * Even the options are empty, we still need to do extra check | |
423 | * against new flags | |
424 | */ | |
95e05289 | 425 | if (!options) |
96da0919 | 426 | goto check; |
95e05289 | 427 | |
be20aa9d CM |
428 | /* |
429 | * strsep changes the string, duplicate it because parse_options | |
430 | * gets called twice | |
431 | */ | |
432 | options = kstrdup(options, GFP_NOFS); | |
433 | if (!options) | |
434 | return -ENOMEM; | |
435 | ||
da495ecc | 436 | orig = options; |
be20aa9d | 437 | |
edf24abe | 438 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
439 | int token; |
440 | if (!*p) | |
441 | continue; | |
442 | ||
443 | token = match_token(p, tokens, args); | |
444 | switch (token) { | |
dfe25020 | 445 | case Opt_degraded: |
efe120a0 | 446 | btrfs_info(root->fs_info, "allowing degraded mounts"); |
edf24abe | 447 | btrfs_set_opt(info->mount_opt, DEGRADED); |
dfe25020 | 448 | break; |
95e05289 | 449 | case Opt_subvol: |
73f73415 | 450 | case Opt_subvolid: |
e15d0542 | 451 | case Opt_subvolrootid: |
43e570b0 | 452 | case Opt_device: |
edf24abe | 453 | /* |
43e570b0 | 454 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
455 | * and can be happily ignored here. |
456 | */ | |
b6cda9bc CM |
457 | break; |
458 | case Opt_nodatasum: | |
3cdde224 | 459 | btrfs_set_and_info(info, NODATASUM, |
07802534 | 460 | "setting nodatasum"); |
be20aa9d | 461 | break; |
d399167d | 462 | case Opt_datasum: |
3cdde224 JM |
463 | if (btrfs_test_opt(info, NODATASUM)) { |
464 | if (btrfs_test_opt(info, NODATACOW)) | |
07802534 QW |
465 | btrfs_info(root->fs_info, "setting datasum, datacow enabled"); |
466 | else | |
467 | btrfs_info(root->fs_info, "setting datasum"); | |
468 | } | |
d399167d QW |
469 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
470 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
471 | break; | |
be20aa9d | 472 | case Opt_nodatacow: |
3cdde224 JM |
473 | if (!btrfs_test_opt(info, NODATACOW)) { |
474 | if (!btrfs_test_opt(info, COMPRESS) || | |
475 | !btrfs_test_opt(info, FORCE_COMPRESS)) { | |
efe120a0 | 476 | btrfs_info(root->fs_info, |
07802534 QW |
477 | "setting nodatacow, compression disabled"); |
478 | } else { | |
479 | btrfs_info(root->fs_info, "setting nodatacow"); | |
480 | } | |
bedb2cca | 481 | } |
bedb2cca AP |
482 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
483 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
edf24abe CH |
484 | btrfs_set_opt(info->mount_opt, NODATACOW); |
485 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 486 | break; |
a258af7a | 487 | case Opt_datacow: |
3cdde224 | 488 | btrfs_clear_and_info(info, NODATACOW, |
07802534 | 489 | "setting datacow"); |
a258af7a | 490 | break; |
a555f810 | 491 | case Opt_compress_force: |
261507a0 LZ |
492 | case Opt_compress_force_type: |
493 | compress_force = true; | |
1c697d4a | 494 | /* Fallthrough */ |
261507a0 LZ |
495 | case Opt_compress: |
496 | case Opt_compress_type: | |
3cdde224 JM |
497 | saved_compress_type = btrfs_test_opt(info, |
498 | COMPRESS) ? | |
b7c47bbb TI |
499 | info->compress_type : BTRFS_COMPRESS_NONE; |
500 | saved_compress_force = | |
3cdde224 | 501 | btrfs_test_opt(info, FORCE_COMPRESS); |
261507a0 LZ |
502 | if (token == Opt_compress || |
503 | token == Opt_compress_force || | |
504 | strcmp(args[0].from, "zlib") == 0) { | |
505 | compress_type = "zlib"; | |
506 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
063849ea | 507 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
508 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
509 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
b7c47bbb | 510 | no_compress = 0; |
a6fa6fae LZ |
511 | } else if (strcmp(args[0].from, "lzo") == 0) { |
512 | compress_type = "lzo"; | |
513 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 514 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
515 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
516 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
2b0ce2c2 | 517 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
b7c47bbb | 518 | no_compress = 0; |
063849ea AH |
519 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
520 | compress_type = "no"; | |
063849ea AH |
521 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
522 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
523 | compress_force = false; | |
b7c47bbb | 524 | no_compress++; |
261507a0 LZ |
525 | } else { |
526 | ret = -EINVAL; | |
527 | goto out; | |
528 | } | |
529 | ||
261507a0 | 530 | if (compress_force) { |
b7c47bbb | 531 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); |
143f3636 | 532 | } else { |
4027e0f4 WS |
533 | /* |
534 | * If we remount from compress-force=xxx to | |
535 | * compress=xxx, we need clear FORCE_COMPRESS | |
536 | * flag, otherwise, there is no way for users | |
537 | * to disable forcible compression separately. | |
538 | */ | |
539 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
a7e252af | 540 | } |
3cdde224 | 541 | if ((btrfs_test_opt(info, COMPRESS) && |
b7c47bbb TI |
542 | (info->compress_type != saved_compress_type || |
543 | compress_force != saved_compress_force)) || | |
3cdde224 | 544 | (!btrfs_test_opt(info, COMPRESS) && |
b7c47bbb TI |
545 | no_compress == 1)) { |
546 | btrfs_info(root->fs_info, | |
547 | "%s %s compression", | |
548 | (compress_force) ? "force" : "use", | |
549 | compress_type); | |
550 | } | |
551 | compress_force = false; | |
a555f810 | 552 | break; |
e18e4809 | 553 | case Opt_ssd: |
3cdde224 | 554 | btrfs_set_and_info(info, SSD, |
07802534 | 555 | "use ssd allocation scheme"); |
e18e4809 | 556 | break; |
451d7585 | 557 | case Opt_ssd_spread: |
3cdde224 | 558 | btrfs_set_and_info(info, SSD_SPREAD, |
07802534 | 559 | "use spread ssd allocation scheme"); |
2aa06a35 | 560 | btrfs_set_opt(info->mount_opt, SSD); |
451d7585 | 561 | break; |
3b30c22f | 562 | case Opt_nossd: |
3cdde224 | 563 | btrfs_set_and_info(info, NOSSD, |
07802534 | 564 | "not using ssd allocation scheme"); |
3b30c22f CM |
565 | btrfs_clear_opt(info->mount_opt, SSD); |
566 | break; | |
842bef58 | 567 | case Opt_barrier: |
3cdde224 | 568 | btrfs_clear_and_info(info, NOBARRIER, |
07802534 | 569 | "turning on barriers"); |
842bef58 | 570 | break; |
21ad10cf | 571 | case Opt_nobarrier: |
3cdde224 | 572 | btrfs_set_and_info(info, NOBARRIER, |
07802534 | 573 | "turning off barriers"); |
21ad10cf | 574 | break; |
4543df7e | 575 | case Opt_thread_pool: |
2c334e87 WS |
576 | ret = match_int(&args[0], &intarg); |
577 | if (ret) { | |
578 | goto out; | |
579 | } else if (intarg > 0) { | |
4543df7e | 580 | info->thread_pool_size = intarg; |
2c334e87 WS |
581 | } else { |
582 | ret = -EINVAL; | |
583 | goto out; | |
584 | } | |
4543df7e | 585 | break; |
6f568d35 | 586 | case Opt_max_inline: |
edf24abe CH |
587 | num = match_strdup(&args[0]); |
588 | if (num) { | |
91748467 | 589 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
590 | kfree(num); |
591 | ||
15ada040 | 592 | if (info->max_inline) { |
feb5f965 | 593 | info->max_inline = min_t(u64, |
15ada040 CM |
594 | info->max_inline, |
595 | root->sectorsize); | |
596 | } | |
efe120a0 | 597 | btrfs_info(root->fs_info, "max_inline at %llu", |
c1c9ff7c | 598 | info->max_inline); |
2c334e87 WS |
599 | } else { |
600 | ret = -ENOMEM; | |
601 | goto out; | |
6f568d35 CM |
602 | } |
603 | break; | |
8f662a76 | 604 | case Opt_alloc_start: |
edf24abe CH |
605 | num = match_strdup(&args[0]); |
606 | if (num) { | |
c018daec | 607 | mutex_lock(&info->chunk_mutex); |
91748467 | 608 | info->alloc_start = memparse(num, NULL); |
c018daec | 609 | mutex_unlock(&info->chunk_mutex); |
edf24abe | 610 | kfree(num); |
efe120a0 | 611 | btrfs_info(root->fs_info, "allocations start at %llu", |
c1c9ff7c | 612 | info->alloc_start); |
2c334e87 WS |
613 | } else { |
614 | ret = -ENOMEM; | |
615 | goto out; | |
8f662a76 CM |
616 | } |
617 | break; | |
bd0330ad | 618 | case Opt_acl: |
45ff35d6 | 619 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
bd0330ad QW |
620 | root->fs_info->sb->s_flags |= MS_POSIXACL; |
621 | break; | |
45ff35d6 GZ |
622 | #else |
623 | btrfs_err(root->fs_info, | |
624 | "support for ACL not compiled in!"); | |
625 | ret = -EINVAL; | |
626 | goto out; | |
627 | #endif | |
33268eaf JB |
628 | case Opt_noacl: |
629 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
630 | break; | |
3a5e1404 | 631 | case Opt_notreelog: |
3cdde224 | 632 | btrfs_set_and_info(info, NOTREELOG, |
07802534 | 633 | "disabling tree log"); |
a88998f2 QW |
634 | break; |
635 | case Opt_treelog: | |
3cdde224 | 636 | btrfs_clear_and_info(info, NOTREELOG, |
07802534 | 637 | "enabling tree log"); |
3a5e1404 | 638 | break; |
fed8f166 | 639 | case Opt_norecovery: |
96da0919 | 640 | case Opt_nologreplay: |
3cdde224 | 641 | btrfs_set_and_info(info, NOLOGREPLAY, |
96da0919 QW |
642 | "disabling log replay at mount time"); |
643 | break; | |
dccae999 | 644 | case Opt_flushoncommit: |
3cdde224 | 645 | btrfs_set_and_info(info, FLUSHONCOMMIT, |
07802534 | 646 | "turning on flush-on-commit"); |
dccae999 | 647 | break; |
2c9ee856 | 648 | case Opt_noflushoncommit: |
3cdde224 | 649 | btrfs_clear_and_info(info, FLUSHONCOMMIT, |
07802534 | 650 | "turning off flush-on-commit"); |
2c9ee856 | 651 | break; |
97e728d4 | 652 | case Opt_ratio: |
2c334e87 WS |
653 | ret = match_int(&args[0], &intarg); |
654 | if (ret) { | |
655 | goto out; | |
656 | } else if (intarg >= 0) { | |
97e728d4 | 657 | info->metadata_ratio = intarg; |
efe120a0 | 658 | btrfs_info(root->fs_info, "metadata ratio %d", |
97e728d4 | 659 | info->metadata_ratio); |
2c334e87 WS |
660 | } else { |
661 | ret = -EINVAL; | |
662 | goto out; | |
97e728d4 JB |
663 | } |
664 | break; | |
e244a0ae | 665 | case Opt_discard: |
3cdde224 | 666 | btrfs_set_and_info(info, DISCARD, |
07802534 | 667 | "turning on discard"); |
e244a0ae | 668 | break; |
e07a2ade | 669 | case Opt_nodiscard: |
3cdde224 | 670 | btrfs_clear_and_info(info, DISCARD, |
07802534 | 671 | "turning off discard"); |
e07a2ade | 672 | break; |
0af3d00b | 673 | case Opt_space_cache: |
70f6d82e OS |
674 | case Opt_space_cache_version: |
675 | if (token == Opt_space_cache || | |
676 | strcmp(args[0].from, "v1") == 0) { | |
677 | btrfs_clear_opt(root->fs_info->mount_opt, | |
678 | FREE_SPACE_TREE); | |
3cdde224 | 679 | btrfs_set_and_info(info, SPACE_CACHE, |
70f6d82e OS |
680 | "enabling disk space caching"); |
681 | } else if (strcmp(args[0].from, "v2") == 0) { | |
682 | btrfs_clear_opt(root->fs_info->mount_opt, | |
683 | SPACE_CACHE); | |
3cdde224 JM |
684 | btrfs_set_and_info(info, |
685 | FREE_SPACE_TREE, | |
70f6d82e OS |
686 | "enabling free space tree"); |
687 | } else { | |
688 | ret = -EINVAL; | |
689 | goto out; | |
690 | } | |
0de90876 | 691 | break; |
f420ee1e SB |
692 | case Opt_rescan_uuid_tree: |
693 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); | |
694 | break; | |
73bc1876 | 695 | case Opt_no_space_cache: |
3cdde224 JM |
696 | if (btrfs_test_opt(info, SPACE_CACHE)) { |
697 | btrfs_clear_and_info(info, | |
698 | SPACE_CACHE, | |
70f6d82e OS |
699 | "disabling disk space caching"); |
700 | } | |
3cdde224 JM |
701 | if (btrfs_test_opt(info, FREE_SPACE_TREE)) { |
702 | btrfs_clear_and_info(info, | |
703 | FREE_SPACE_TREE, | |
70f6d82e OS |
704 | "disabling free space tree"); |
705 | } | |
73bc1876 | 706 | break; |
4b9465cb | 707 | case Opt_inode_cache: |
7e1876ac | 708 | btrfs_set_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 709 | "enabling inode map caching"); |
3818aea2 QW |
710 | break; |
711 | case Opt_noinode_cache: | |
7e1876ac | 712 | btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 713 | "disabling inode map caching"); |
4b9465cb | 714 | break; |
88c2ba3b | 715 | case Opt_clear_cache: |
3cdde224 | 716 | btrfs_set_and_info(info, CLEAR_CACHE, |
07802534 | 717 | "force clearing of disk cache"); |
0af3d00b | 718 | break; |
4260f7c7 SW |
719 | case Opt_user_subvol_rm_allowed: |
720 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
721 | break; | |
91435650 CM |
722 | case Opt_enospc_debug: |
723 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
724 | break; | |
53036293 QW |
725 | case Opt_noenospc_debug: |
726 | btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); | |
727 | break; | |
4cb5300b | 728 | case Opt_defrag: |
3cdde224 | 729 | btrfs_set_and_info(info, AUTO_DEFRAG, |
07802534 | 730 | "enabling auto defrag"); |
4cb5300b | 731 | break; |
fc0ca9af | 732 | case Opt_nodefrag: |
3cdde224 | 733 | btrfs_clear_and_info(info, AUTO_DEFRAG, |
07802534 | 734 | "disabling auto defrag"); |
fc0ca9af | 735 | break; |
af31f5e5 | 736 | case Opt_recovery: |
8dcddfa0 QW |
737 | btrfs_warn(root->fs_info, |
738 | "'recovery' is deprecated, use 'usebackuproot' instead"); | |
739 | case Opt_usebackuproot: | |
740 | btrfs_info(root->fs_info, | |
741 | "trying to use backup root at mount time"); | |
742 | btrfs_set_opt(info->mount_opt, USEBACKUPROOT); | |
af31f5e5 | 743 | break; |
9555c6c1 ID |
744 | case Opt_skip_balance: |
745 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
746 | break; | |
21adbd5c SB |
747 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
748 | case Opt_check_integrity_including_extent_data: | |
efe120a0 FH |
749 | btrfs_info(root->fs_info, |
750 | "enabling check integrity including extent data"); | |
21adbd5c SB |
751 | btrfs_set_opt(info->mount_opt, |
752 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
753 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
754 | break; | |
755 | case Opt_check_integrity: | |
efe120a0 | 756 | btrfs_info(root->fs_info, "enabling check integrity"); |
21adbd5c SB |
757 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
758 | break; | |
759 | case Opt_check_integrity_print_mask: | |
2c334e87 WS |
760 | ret = match_int(&args[0], &intarg); |
761 | if (ret) { | |
762 | goto out; | |
763 | } else if (intarg >= 0) { | |
21adbd5c | 764 | info->check_integrity_print_mask = intarg; |
efe120a0 | 765 | btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", |
21adbd5c | 766 | info->check_integrity_print_mask); |
2c334e87 WS |
767 | } else { |
768 | ret = -EINVAL; | |
769 | goto out; | |
21adbd5c SB |
770 | } |
771 | break; | |
772 | #else | |
773 | case Opt_check_integrity_including_extent_data: | |
774 | case Opt_check_integrity: | |
775 | case Opt_check_integrity_print_mask: | |
efe120a0 FH |
776 | btrfs_err(root->fs_info, |
777 | "support for check_integrity* not compiled in!"); | |
21adbd5c SB |
778 | ret = -EINVAL; |
779 | goto out; | |
780 | #endif | |
8c342930 JM |
781 | case Opt_fatal_errors: |
782 | if (strcmp(args[0].from, "panic") == 0) | |
783 | btrfs_set_opt(info->mount_opt, | |
784 | PANIC_ON_FATAL_ERROR); | |
785 | else if (strcmp(args[0].from, "bug") == 0) | |
786 | btrfs_clear_opt(info->mount_opt, | |
787 | PANIC_ON_FATAL_ERROR); | |
788 | else { | |
789 | ret = -EINVAL; | |
790 | goto out; | |
791 | } | |
792 | break; | |
8b87dc17 DS |
793 | case Opt_commit_interval: |
794 | intarg = 0; | |
795 | ret = match_int(&args[0], &intarg); | |
796 | if (ret < 0) { | |
efe120a0 | 797 | btrfs_err(root->fs_info, "invalid commit interval"); |
8b87dc17 DS |
798 | ret = -EINVAL; |
799 | goto out; | |
800 | } | |
801 | if (intarg > 0) { | |
802 | if (intarg > 300) { | |
efe120a0 | 803 | btrfs_warn(root->fs_info, "excessive commit interval %d", |
8b87dc17 DS |
804 | intarg); |
805 | } | |
806 | info->commit_interval = intarg; | |
807 | } else { | |
efe120a0 | 808 | btrfs_info(root->fs_info, "using default commit interval %ds", |
8b87dc17 DS |
809 | BTRFS_DEFAULT_COMMIT_INTERVAL); |
810 | info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; | |
811 | } | |
812 | break; | |
d0bd4560 JB |
813 | #ifdef CONFIG_BTRFS_DEBUG |
814 | case Opt_fragment_all: | |
815 | btrfs_info(root->fs_info, "fragmenting all space"); | |
816 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); | |
817 | btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); | |
818 | break; | |
819 | case Opt_fragment_metadata: | |
820 | btrfs_info(root->fs_info, "fragmenting metadata"); | |
821 | btrfs_set_opt(info->mount_opt, | |
822 | FRAGMENT_METADATA); | |
823 | break; | |
824 | case Opt_fragment_data: | |
825 | btrfs_info(root->fs_info, "fragmenting data"); | |
826 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); | |
827 | break; | |
828 | #endif | |
a7a3f7ca | 829 | case Opt_err: |
efe120a0 | 830 | btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); |
a7a3f7ca SW |
831 | ret = -EINVAL; |
832 | goto out; | |
95e05289 | 833 | default: |
be20aa9d | 834 | break; |
95e05289 CM |
835 | } |
836 | } | |
96da0919 QW |
837 | check: |
838 | /* | |
839 | * Extra check for current option against current flag | |
840 | */ | |
3cdde224 | 841 | if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & MS_RDONLY)) { |
96da0919 QW |
842 | btrfs_err(root->fs_info, |
843 | "nologreplay must be used with ro mount option"); | |
844 | ret = -EINVAL; | |
845 | } | |
a7a3f7ca | 846 | out: |
70f6d82e | 847 | if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) && |
3cdde224 JM |
848 | !btrfs_test_opt(info, FREE_SPACE_TREE) && |
849 | !btrfs_test_opt(info, CLEAR_CACHE)) { | |
70f6d82e OS |
850 | btrfs_err(root->fs_info, "cannot disable free space tree"); |
851 | ret = -EINVAL; | |
852 | ||
853 | } | |
3cdde224 | 854 | if (!ret && btrfs_test_opt(info, SPACE_CACHE)) |
efe120a0 | 855 | btrfs_info(root->fs_info, "disk space caching is enabled"); |
3cdde224 | 856 | if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) |
70f6d82e | 857 | btrfs_info(root->fs_info, "using free space tree"); |
da495ecc | 858 | kfree(orig); |
a7a3f7ca | 859 | return ret; |
edf24abe CH |
860 | } |
861 | ||
862 | /* | |
863 | * Parse mount options that are required early in the mount process. | |
864 | * | |
865 | * All other options will be parsed on much later in the mount process and | |
866 | * only when we need to allocate a new super block. | |
867 | */ | |
97288f2c | 868 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 869 | void *holder, char **subvol_name, u64 *subvol_objectid, |
5e2a4b25 | 870 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
871 | { |
872 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 873 | char *device_name, *opts, *orig, *p; |
1493381f | 874 | char *num = NULL; |
edf24abe CH |
875 | int error = 0; |
876 | ||
877 | if (!options) | |
830c4adb | 878 | return 0; |
edf24abe CH |
879 | |
880 | /* | |
881 | * strsep changes the string, duplicate it because parse_options | |
882 | * gets called twice | |
883 | */ | |
884 | opts = kstrdup(options, GFP_KERNEL); | |
885 | if (!opts) | |
886 | return -ENOMEM; | |
3f3d0bc0 | 887 | orig = opts; |
edf24abe CH |
888 | |
889 | while ((p = strsep(&opts, ",")) != NULL) { | |
890 | int token; | |
891 | if (!*p) | |
892 | continue; | |
893 | ||
894 | token = match_token(p, tokens, args); | |
895 | switch (token) { | |
896 | case Opt_subvol: | |
a90e8b6f | 897 | kfree(*subvol_name); |
edf24abe | 898 | *subvol_name = match_strdup(&args[0]); |
2c334e87 WS |
899 | if (!*subvol_name) { |
900 | error = -ENOMEM; | |
901 | goto out; | |
902 | } | |
edf24abe | 903 | break; |
73f73415 | 904 | case Opt_subvolid: |
1493381f WS |
905 | num = match_strdup(&args[0]); |
906 | if (num) { | |
907 | *subvol_objectid = memparse(num, NULL); | |
908 | kfree(num); | |
4849f01d | 909 | /* we want the original fs_tree */ |
1493381f | 910 | if (!*subvol_objectid) |
4849f01d JB |
911 | *subvol_objectid = |
912 | BTRFS_FS_TREE_OBJECTID; | |
2c334e87 WS |
913 | } else { |
914 | error = -EINVAL; | |
915 | goto out; | |
4849f01d | 916 | } |
73f73415 | 917 | break; |
e15d0542 | 918 | case Opt_subvolrootid: |
5e2a4b25 | 919 | printk(KERN_WARNING |
efe120a0 FH |
920 | "BTRFS: 'subvolrootid' mount option is deprecated and has " |
921 | "no effect\n"); | |
e15d0542 | 922 | break; |
43e570b0 | 923 | case Opt_device: |
83c8c9bd JL |
924 | device_name = match_strdup(&args[0]); |
925 | if (!device_name) { | |
926 | error = -ENOMEM; | |
927 | goto out; | |
928 | } | |
929 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 930 | flags, holder, fs_devices); |
83c8c9bd | 931 | kfree(device_name); |
43e570b0 | 932 | if (error) |
830c4adb | 933 | goto out; |
43e570b0 | 934 | break; |
edf24abe CH |
935 | default: |
936 | break; | |
937 | } | |
938 | } | |
939 | ||
830c4adb | 940 | out: |
3f3d0bc0 | 941 | kfree(orig); |
edf24abe | 942 | return error; |
95e05289 CM |
943 | } |
944 | ||
05dbe683 OS |
945 | static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, |
946 | u64 subvol_objectid) | |
73f73415 | 947 | { |
815745cf | 948 | struct btrfs_root *root = fs_info->tree_root; |
05dbe683 OS |
949 | struct btrfs_root *fs_root; |
950 | struct btrfs_root_ref *root_ref; | |
951 | struct btrfs_inode_ref *inode_ref; | |
952 | struct btrfs_key key; | |
953 | struct btrfs_path *path = NULL; | |
954 | char *name = NULL, *ptr; | |
955 | u64 dirid; | |
956 | int len; | |
957 | int ret; | |
958 | ||
959 | path = btrfs_alloc_path(); | |
960 | if (!path) { | |
961 | ret = -ENOMEM; | |
962 | goto err; | |
963 | } | |
964 | path->leave_spinning = 1; | |
965 | ||
966 | name = kmalloc(PATH_MAX, GFP_NOFS); | |
967 | if (!name) { | |
968 | ret = -ENOMEM; | |
969 | goto err; | |
970 | } | |
971 | ptr = name + PATH_MAX - 1; | |
972 | ptr[0] = '\0'; | |
73f73415 JB |
973 | |
974 | /* | |
05dbe683 OS |
975 | * Walk up the subvolume trees in the tree of tree roots by root |
976 | * backrefs until we hit the top-level subvolume. | |
73f73415 | 977 | */ |
05dbe683 OS |
978 | while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
979 | key.objectid = subvol_objectid; | |
980 | key.type = BTRFS_ROOT_BACKREF_KEY; | |
981 | key.offset = (u64)-1; | |
982 | ||
983 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
984 | if (ret < 0) { | |
985 | goto err; | |
986 | } else if (ret > 0) { | |
987 | ret = btrfs_previous_item(root, path, subvol_objectid, | |
988 | BTRFS_ROOT_BACKREF_KEY); | |
989 | if (ret < 0) { | |
990 | goto err; | |
991 | } else if (ret > 0) { | |
992 | ret = -ENOENT; | |
993 | goto err; | |
994 | } | |
995 | } | |
996 | ||
997 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
998 | subvol_objectid = key.offset; | |
999 | ||
1000 | root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1001 | struct btrfs_root_ref); | |
1002 | len = btrfs_root_ref_name_len(path->nodes[0], root_ref); | |
1003 | ptr -= len + 1; | |
1004 | if (ptr < name) { | |
1005 | ret = -ENAMETOOLONG; | |
1006 | goto err; | |
1007 | } | |
1008 | read_extent_buffer(path->nodes[0], ptr + 1, | |
1009 | (unsigned long)(root_ref + 1), len); | |
1010 | ptr[0] = '/'; | |
1011 | dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); | |
1012 | btrfs_release_path(path); | |
1013 | ||
1014 | key.objectid = subvol_objectid; | |
1015 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1016 | key.offset = (u64)-1; | |
1017 | fs_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
1018 | if (IS_ERR(fs_root)) { | |
1019 | ret = PTR_ERR(fs_root); | |
1020 | goto err; | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * Walk up the filesystem tree by inode refs until we hit the | |
1025 | * root directory. | |
1026 | */ | |
1027 | while (dirid != BTRFS_FIRST_FREE_OBJECTID) { | |
1028 | key.objectid = dirid; | |
1029 | key.type = BTRFS_INODE_REF_KEY; | |
1030 | key.offset = (u64)-1; | |
1031 | ||
1032 | ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); | |
1033 | if (ret < 0) { | |
1034 | goto err; | |
1035 | } else if (ret > 0) { | |
1036 | ret = btrfs_previous_item(fs_root, path, dirid, | |
1037 | BTRFS_INODE_REF_KEY); | |
1038 | if (ret < 0) { | |
1039 | goto err; | |
1040 | } else if (ret > 0) { | |
1041 | ret = -ENOENT; | |
1042 | goto err; | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1047 | dirid = key.offset; | |
1048 | ||
1049 | inode_ref = btrfs_item_ptr(path->nodes[0], | |
1050 | path->slots[0], | |
1051 | struct btrfs_inode_ref); | |
1052 | len = btrfs_inode_ref_name_len(path->nodes[0], | |
1053 | inode_ref); | |
1054 | ptr -= len + 1; | |
1055 | if (ptr < name) { | |
1056 | ret = -ENAMETOOLONG; | |
1057 | goto err; | |
1058 | } | |
1059 | read_extent_buffer(path->nodes[0], ptr + 1, | |
1060 | (unsigned long)(inode_ref + 1), len); | |
1061 | ptr[0] = '/'; | |
1062 | btrfs_release_path(path); | |
1063 | } | |
73f73415 JB |
1064 | } |
1065 | ||
05dbe683 OS |
1066 | btrfs_free_path(path); |
1067 | if (ptr == name + PATH_MAX - 1) { | |
1068 | name[0] = '/'; | |
1069 | name[1] = '\0'; | |
1070 | } else { | |
1071 | memmove(name, ptr, name + PATH_MAX - ptr); | |
1072 | } | |
1073 | return name; | |
1074 | ||
1075 | err: | |
1076 | btrfs_free_path(path); | |
1077 | kfree(name); | |
1078 | return ERR_PTR(ret); | |
1079 | } | |
1080 | ||
1081 | static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) | |
1082 | { | |
1083 | struct btrfs_root *root = fs_info->tree_root; | |
1084 | struct btrfs_dir_item *di; | |
1085 | struct btrfs_path *path; | |
1086 | struct btrfs_key location; | |
1087 | u64 dir_id; | |
1088 | ||
73f73415 JB |
1089 | path = btrfs_alloc_path(); |
1090 | if (!path) | |
05dbe683 | 1091 | return -ENOMEM; |
73f73415 JB |
1092 | path->leave_spinning = 1; |
1093 | ||
1094 | /* | |
1095 | * Find the "default" dir item which points to the root item that we | |
1096 | * will mount by default if we haven't been given a specific subvolume | |
1097 | * to mount. | |
1098 | */ | |
815745cf | 1099 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 1100 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
1101 | if (IS_ERR(di)) { |
1102 | btrfs_free_path(path); | |
05dbe683 | 1103 | return PTR_ERR(di); |
b0839166 | 1104 | } |
73f73415 JB |
1105 | if (!di) { |
1106 | /* | |
1107 | * Ok the default dir item isn't there. This is weird since | |
1108 | * it's always been there, but don't freak out, just try and | |
05dbe683 | 1109 | * mount the top-level subvolume. |
73f73415 JB |
1110 | */ |
1111 | btrfs_free_path(path); | |
05dbe683 OS |
1112 | *objectid = BTRFS_FS_TREE_OBJECTID; |
1113 | return 0; | |
73f73415 JB |
1114 | } |
1115 | ||
1116 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
1117 | btrfs_free_path(path); | |
05dbe683 OS |
1118 | *objectid = location.objectid; |
1119 | return 0; | |
73f73415 JB |
1120 | } |
1121 | ||
d397712b | 1122 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 1123 | struct btrfs_fs_devices *fs_devices, |
d397712b | 1124 | void *data, int silent) |
75dfe396 | 1125 | { |
d397712b | 1126 | struct inode *inode; |
815745cf | 1127 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 1128 | struct btrfs_key key; |
39279cc3 | 1129 | int err; |
a429e513 | 1130 | |
39279cc3 CM |
1131 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
1132 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
1133 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 1134 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 1135 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 1136 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 1137 | sb->s_time_gran = 1; |
0eda294d | 1138 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 1139 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 1140 | #endif |
0c4d2d95 | 1141 | sb->s_flags |= MS_I_VERSION; |
da2f0f74 | 1142 | sb->s_iflags |= SB_I_CGROUPWB; |
ad2b2c80 AV |
1143 | err = open_ctree(sb, fs_devices, (char *)data); |
1144 | if (err) { | |
efe120a0 | 1145 | printk(KERN_ERR "BTRFS: open_ctree failed\n"); |
ad2b2c80 | 1146 | return err; |
a429e513 CM |
1147 | } |
1148 | ||
5d4f98a2 YZ |
1149 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
1150 | key.type = BTRFS_INODE_ITEM_KEY; | |
1151 | key.offset = 0; | |
98c7089c | 1152 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
1153 | if (IS_ERR(inode)) { |
1154 | err = PTR_ERR(inode); | |
39279cc3 | 1155 | goto fail_close; |
f254e52c | 1156 | } |
f254e52c | 1157 | |
48fde701 AV |
1158 | sb->s_root = d_make_root(inode); |
1159 | if (!sb->s_root) { | |
39279cc3 CM |
1160 | err = -ENOMEM; |
1161 | goto fail_close; | |
f254e52c | 1162 | } |
58176a96 | 1163 | |
6885f308 | 1164 | save_mount_options(sb, data); |
90a887c9 | 1165 | cleancache_init_fs(sb); |
59553edf | 1166 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 1167 | return 0; |
39279cc3 CM |
1168 | |
1169 | fail_close: | |
815745cf | 1170 | close_ctree(fs_info->tree_root); |
39279cc3 | 1171 | return err; |
2619ba1f CM |
1172 | } |
1173 | ||
6bf13c0c | 1174 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
1175 | { |
1176 | struct btrfs_trans_handle *trans; | |
815745cf AV |
1177 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1178 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 1179 | |
bc074524 | 1180 | trace_btrfs_sync_fs(fs_info, wait); |
1abe9b8a | 1181 | |
39279cc3 | 1182 | if (!wait) { |
815745cf | 1183 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
1184 | return 0; |
1185 | } | |
771ed689 | 1186 | |
578def7c | 1187 | btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); |
771ed689 | 1188 | |
d4edf39b | 1189 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 1190 | if (IS_ERR(trans)) { |
354aa0fb | 1191 | /* no transaction, don't bother */ |
6b5fe46d DS |
1192 | if (PTR_ERR(trans) == -ENOENT) { |
1193 | /* | |
1194 | * Exit unless we have some pending changes | |
1195 | * that need to go through commit | |
1196 | */ | |
1197 | if (fs_info->pending_changes == 0) | |
1198 | return 0; | |
a53f4f8e QW |
1199 | /* |
1200 | * A non-blocking test if the fs is frozen. We must not | |
1201 | * start a new transaction here otherwise a deadlock | |
1202 | * happens. The pending operations are delayed to the | |
1203 | * next commit after thawing. | |
1204 | */ | |
1205 | if (__sb_start_write(sb, SB_FREEZE_WRITE, false)) | |
1206 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1207 | else | |
1208 | return 0; | |
6b5fe46d | 1209 | trans = btrfs_start_transaction(root, 0); |
6b5fe46d | 1210 | } |
98bd5c54 DS |
1211 | if (IS_ERR(trans)) |
1212 | return PTR_ERR(trans); | |
60376ce4 | 1213 | } |
bd7de2c9 | 1214 | return btrfs_commit_transaction(trans, root); |
2c90e5d6 CM |
1215 | } |
1216 | ||
34c80b1d | 1217 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 1218 | { |
815745cf AV |
1219 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
1220 | struct btrfs_root *root = info->tree_root; | |
200da64e | 1221 | char *compress_type; |
a9572a15 | 1222 | |
3cdde224 | 1223 | if (btrfs_test_opt(info, DEGRADED)) |
a9572a15 | 1224 | seq_puts(seq, ",degraded"); |
3cdde224 | 1225 | if (btrfs_test_opt(info, NODATASUM)) |
a9572a15 | 1226 | seq_puts(seq, ",nodatasum"); |
3cdde224 | 1227 | if (btrfs_test_opt(info, NODATACOW)) |
a9572a15 | 1228 | seq_puts(seq, ",nodatacow"); |
3cdde224 | 1229 | if (btrfs_test_opt(info, NOBARRIER)) |
a9572a15 | 1230 | seq_puts(seq, ",nobarrier"); |
95ac567a | 1231 | if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) |
c1c9ff7c | 1232 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
a9572a15 | 1233 | if (info->alloc_start != 0) |
c1c9ff7c | 1234 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); |
a9572a15 EP |
1235 | if (info->thread_pool_size != min_t(unsigned long, |
1236 | num_online_cpus() + 2, 8)) | |
1237 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
3cdde224 | 1238 | if (btrfs_test_opt(info, COMPRESS)) { |
200da64e TI |
1239 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) |
1240 | compress_type = "zlib"; | |
1241 | else | |
1242 | compress_type = "lzo"; | |
3cdde224 | 1243 | if (btrfs_test_opt(info, FORCE_COMPRESS)) |
200da64e TI |
1244 | seq_printf(seq, ",compress-force=%s", compress_type); |
1245 | else | |
1246 | seq_printf(seq, ",compress=%s", compress_type); | |
1247 | } | |
3cdde224 | 1248 | if (btrfs_test_opt(info, NOSSD)) |
c289811c | 1249 | seq_puts(seq, ",nossd"); |
3cdde224 | 1250 | if (btrfs_test_opt(info, SSD_SPREAD)) |
451d7585 | 1251 | seq_puts(seq, ",ssd_spread"); |
3cdde224 | 1252 | else if (btrfs_test_opt(info, SSD)) |
a9572a15 | 1253 | seq_puts(seq, ",ssd"); |
3cdde224 | 1254 | if (btrfs_test_opt(info, NOTREELOG)) |
6b65c5c6 | 1255 | seq_puts(seq, ",notreelog"); |
3cdde224 | 1256 | if (btrfs_test_opt(info, NOLOGREPLAY)) |
96da0919 | 1257 | seq_puts(seq, ",nologreplay"); |
3cdde224 | 1258 | if (btrfs_test_opt(info, FLUSHONCOMMIT)) |
6b65c5c6 | 1259 | seq_puts(seq, ",flushoncommit"); |
3cdde224 | 1260 | if (btrfs_test_opt(info, DISCARD)) |
20a5239a | 1261 | seq_puts(seq, ",discard"); |
a9572a15 EP |
1262 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
1263 | seq_puts(seq, ",noacl"); | |
3cdde224 | 1264 | if (btrfs_test_opt(info, SPACE_CACHE)) |
200da64e | 1265 | seq_puts(seq, ",space_cache"); |
3cdde224 | 1266 | else if (btrfs_test_opt(info, FREE_SPACE_TREE)) |
70f6d82e | 1267 | seq_puts(seq, ",space_cache=v2"); |
73bc1876 | 1268 | else |
8965593e | 1269 | seq_puts(seq, ",nospace_cache"); |
3cdde224 | 1270 | if (btrfs_test_opt(info, RESCAN_UUID_TREE)) |
f420ee1e | 1271 | seq_puts(seq, ",rescan_uuid_tree"); |
3cdde224 | 1272 | if (btrfs_test_opt(info, CLEAR_CACHE)) |
200da64e | 1273 | seq_puts(seq, ",clear_cache"); |
3cdde224 | 1274 | if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) |
200da64e | 1275 | seq_puts(seq, ",user_subvol_rm_allowed"); |
3cdde224 | 1276 | if (btrfs_test_opt(info, ENOSPC_DEBUG)) |
0942caa3 | 1277 | seq_puts(seq, ",enospc_debug"); |
3cdde224 | 1278 | if (btrfs_test_opt(info, AUTO_DEFRAG)) |
0942caa3 | 1279 | seq_puts(seq, ",autodefrag"); |
3cdde224 | 1280 | if (btrfs_test_opt(info, INODE_MAP_CACHE)) |
0942caa3 | 1281 | seq_puts(seq, ",inode_cache"); |
3cdde224 | 1282 | if (btrfs_test_opt(info, SKIP_BALANCE)) |
9555c6c1 | 1283 | seq_puts(seq, ",skip_balance"); |
8507d216 | 1284 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
3cdde224 | 1285 | if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) |
8507d216 | 1286 | seq_puts(seq, ",check_int_data"); |
3cdde224 | 1287 | else if (btrfs_test_opt(info, CHECK_INTEGRITY)) |
8507d216 WS |
1288 | seq_puts(seq, ",check_int"); |
1289 | if (info->check_integrity_print_mask) | |
1290 | seq_printf(seq, ",check_int_print_mask=%d", | |
1291 | info->check_integrity_print_mask); | |
1292 | #endif | |
1293 | if (info->metadata_ratio) | |
1294 | seq_printf(seq, ",metadata_ratio=%d", | |
1295 | info->metadata_ratio); | |
3cdde224 | 1296 | if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) |
8c342930 | 1297 | seq_puts(seq, ",fatal_errors=panic"); |
8b87dc17 DS |
1298 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
1299 | seq_printf(seq, ",commit=%d", info->commit_interval); | |
d0bd4560 | 1300 | #ifdef CONFIG_BTRFS_DEBUG |
3cdde224 | 1301 | if (btrfs_test_opt(info, FRAGMENT_DATA)) |
d0bd4560 | 1302 | seq_puts(seq, ",fragment=data"); |
3cdde224 | 1303 | if (btrfs_test_opt(info, FRAGMENT_METADATA)) |
d0bd4560 JB |
1304 | seq_puts(seq, ",fragment=metadata"); |
1305 | #endif | |
c8d3fe02 OS |
1306 | seq_printf(seq, ",subvolid=%llu", |
1307 | BTRFS_I(d_inode(dentry))->root->root_key.objectid); | |
1308 | seq_puts(seq, ",subvol="); | |
1309 | seq_dentry(seq, dentry, " \t\n\\"); | |
a9572a15 EP |
1310 | return 0; |
1311 | } | |
1312 | ||
a061fc8d | 1313 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 1314 | { |
815745cf AV |
1315 | struct btrfs_fs_info *p = data; |
1316 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 1317 | |
815745cf | 1318 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
1319 | } |
1320 | ||
450ba0ea JB |
1321 | static int btrfs_set_super(struct super_block *s, void *data) |
1322 | { | |
6de1d09d AV |
1323 | int err = set_anon_super(s, data); |
1324 | if (!err) | |
1325 | s->s_fs_info = data; | |
1326 | return err; | |
4b82d6e4 Y |
1327 | } |
1328 | ||
f9d9ef62 DS |
1329 | /* |
1330 | * subvolumes are identified by ino 256 | |
1331 | */ | |
1332 | static inline int is_subvolume_inode(struct inode *inode) | |
1333 | { | |
1334 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1335 | return 1; | |
1336 | return 0; | |
1337 | } | |
1338 | ||
830c4adb | 1339 | /* |
e6e4dbe8 OS |
1340 | * This will add subvolid=0 to the argument string while removing any subvol= |
1341 | * and subvolid= arguments to make sure we get the top-level root for path | |
1342 | * walking to the subvol we want. | |
830c4adb JB |
1343 | */ |
1344 | static char *setup_root_args(char *args) | |
1345 | { | |
e6e4dbe8 | 1346 | char *buf, *dst, *sep; |
830c4adb | 1347 | |
e6e4dbe8 OS |
1348 | if (!args) |
1349 | return kstrdup("subvolid=0", GFP_NOFS); | |
f60d16a8 | 1350 | |
e6e4dbe8 OS |
1351 | /* The worst case is that we add ",subvolid=0" to the end. */ |
1352 | buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS); | |
f60d16a8 | 1353 | if (!buf) |
830c4adb | 1354 | return NULL; |
830c4adb | 1355 | |
e6e4dbe8 OS |
1356 | while (1) { |
1357 | sep = strchrnul(args, ','); | |
1358 | if (!strstarts(args, "subvol=") && | |
1359 | !strstarts(args, "subvolid=")) { | |
1360 | memcpy(dst, args, sep - args); | |
1361 | dst += sep - args; | |
1362 | *dst++ = ','; | |
1363 | } | |
1364 | if (*sep) | |
1365 | args = sep + 1; | |
1366 | else | |
1367 | break; | |
830c4adb | 1368 | } |
f60d16a8 | 1369 | strcpy(dst, "subvolid=0"); |
830c4adb | 1370 | |
f60d16a8 | 1371 | return buf; |
830c4adb JB |
1372 | } |
1373 | ||
bb289b7b OS |
1374 | static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, |
1375 | int flags, const char *device_name, | |
1376 | char *data) | |
830c4adb | 1377 | { |
830c4adb | 1378 | struct dentry *root; |
fa330659 | 1379 | struct vfsmount *mnt = NULL; |
830c4adb | 1380 | char *newargs; |
fa330659 | 1381 | int ret; |
830c4adb JB |
1382 | |
1383 | newargs = setup_root_args(data); | |
fa330659 OS |
1384 | if (!newargs) { |
1385 | root = ERR_PTR(-ENOMEM); | |
1386 | goto out; | |
1387 | } | |
0723a047 | 1388 | |
fa330659 OS |
1389 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); |
1390 | if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { | |
0723a047 | 1391 | if (flags & MS_RDONLY) { |
fa330659 OS |
1392 | mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, |
1393 | device_name, newargs); | |
0723a047 | 1394 | } else { |
fa330659 OS |
1395 | mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, |
1396 | device_name, newargs); | |
0040e606 | 1397 | if (IS_ERR(mnt)) { |
fa330659 OS |
1398 | root = ERR_CAST(mnt); |
1399 | mnt = NULL; | |
1400 | goto out; | |
0040e606 | 1401 | } |
0723a047 | 1402 | |
773cd04e | 1403 | down_write(&mnt->mnt_sb->s_umount); |
fa330659 | 1404 | ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); |
773cd04e | 1405 | up_write(&mnt->mnt_sb->s_umount); |
fa330659 OS |
1406 | if (ret < 0) { |
1407 | root = ERR_PTR(ret); | |
1408 | goto out; | |
0723a047 HH |
1409 | } |
1410 | } | |
1411 | } | |
fa330659 OS |
1412 | if (IS_ERR(mnt)) { |
1413 | root = ERR_CAST(mnt); | |
1414 | mnt = NULL; | |
1415 | goto out; | |
1416 | } | |
830c4adb | 1417 | |
05dbe683 OS |
1418 | if (!subvol_name) { |
1419 | if (!subvol_objectid) { | |
1420 | ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), | |
1421 | &subvol_objectid); | |
1422 | if (ret) { | |
1423 | root = ERR_PTR(ret); | |
1424 | goto out; | |
1425 | } | |
1426 | } | |
1427 | subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), | |
1428 | subvol_objectid); | |
1429 | if (IS_ERR(subvol_name)) { | |
1430 | root = ERR_CAST(subvol_name); | |
1431 | subvol_name = NULL; | |
1432 | goto out; | |
1433 | } | |
1434 | ||
1435 | } | |
1436 | ||
ea441d11 | 1437 | root = mount_subtree(mnt, subvol_name); |
fa330659 OS |
1438 | /* mount_subtree() drops our reference on the vfsmount. */ |
1439 | mnt = NULL; | |
830c4adb | 1440 | |
bb289b7b | 1441 | if (!IS_ERR(root)) { |
ea441d11 | 1442 | struct super_block *s = root->d_sb; |
bb289b7b OS |
1443 | struct inode *root_inode = d_inode(root); |
1444 | u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; | |
1445 | ||
1446 | ret = 0; | |
1447 | if (!is_subvolume_inode(root_inode)) { | |
1448 | pr_err("BTRFS: '%s' is not a valid subvolume\n", | |
1449 | subvol_name); | |
1450 | ret = -EINVAL; | |
1451 | } | |
1452 | if (subvol_objectid && root_objectid != subvol_objectid) { | |
05dbe683 OS |
1453 | /* |
1454 | * This will also catch a race condition where a | |
1455 | * subvolume which was passed by ID is renamed and | |
1456 | * another subvolume is renamed over the old location. | |
1457 | */ | |
bb289b7b OS |
1458 | pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n", |
1459 | subvol_name, subvol_objectid); | |
1460 | ret = -EINVAL; | |
1461 | } | |
1462 | if (ret) { | |
1463 | dput(root); | |
1464 | root = ERR_PTR(ret); | |
1465 | deactivate_locked_super(s); | |
1466 | } | |
f9d9ef62 DS |
1467 | } |
1468 | ||
fa330659 OS |
1469 | out: |
1470 | mntput(mnt); | |
1471 | kfree(newargs); | |
1472 | kfree(subvol_name); | |
830c4adb JB |
1473 | return root; |
1474 | } | |
450ba0ea | 1475 | |
f667aef6 QW |
1476 | static int parse_security_options(char *orig_opts, |
1477 | struct security_mnt_opts *sec_opts) | |
1478 | { | |
1479 | char *secdata = NULL; | |
1480 | int ret = 0; | |
1481 | ||
1482 | secdata = alloc_secdata(); | |
1483 | if (!secdata) | |
1484 | return -ENOMEM; | |
1485 | ret = security_sb_copy_data(orig_opts, secdata); | |
1486 | if (ret) { | |
1487 | free_secdata(secdata); | |
1488 | return ret; | |
1489 | } | |
1490 | ret = security_sb_parse_opts_str(secdata, sec_opts); | |
1491 | free_secdata(secdata); | |
1492 | return ret; | |
1493 | } | |
1494 | ||
1495 | static int setup_security_options(struct btrfs_fs_info *fs_info, | |
1496 | struct super_block *sb, | |
1497 | struct security_mnt_opts *sec_opts) | |
1498 | { | |
1499 | int ret = 0; | |
1500 | ||
1501 | /* | |
1502 | * Call security_sb_set_mnt_opts() to check whether new sec_opts | |
1503 | * is valid. | |
1504 | */ | |
1505 | ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); | |
1506 | if (ret) | |
1507 | return ret; | |
1508 | ||
a43bb39b | 1509 | #ifdef CONFIG_SECURITY |
f667aef6 QW |
1510 | if (!fs_info->security_opts.num_mnt_opts) { |
1511 | /* first time security setup, copy sec_opts to fs_info */ | |
1512 | memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); | |
1513 | } else { | |
1514 | /* | |
180e4d47 LB |
1515 | * Since SELinux (the only one supporting security_mnt_opts) |
1516 | * does NOT support changing context during remount/mount of | |
1517 | * the same sb, this must be the same or part of the same | |
1518 | * security options, just free it. | |
f667aef6 QW |
1519 | */ |
1520 | security_free_mnt_opts(sec_opts); | |
1521 | } | |
a43bb39b | 1522 | #endif |
f667aef6 QW |
1523 | return ret; |
1524 | } | |
1525 | ||
edf24abe CH |
1526 | /* |
1527 | * Find a superblock for the given device / mount point. | |
1528 | * | |
1529 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1530 | * for multiple device setup. Make sure to keep it in sync. | |
1531 | */ | |
061dbc6b | 1532 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1533 | const char *device_name, void *data) |
4b82d6e4 Y |
1534 | { |
1535 | struct block_device *bdev = NULL; | |
1536 | struct super_block *s; | |
8a4b83cc | 1537 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 1538 | struct btrfs_fs_info *fs_info = NULL; |
f667aef6 | 1539 | struct security_mnt_opts new_sec_opts; |
97288f2c | 1540 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1541 | char *subvol_name = NULL; |
1542 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
1543 | int error = 0; |
1544 | ||
97288f2c CH |
1545 | if (!(flags & MS_RDONLY)) |
1546 | mode |= FMODE_WRITE; | |
1547 | ||
1548 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 1549 | &subvol_name, &subvol_objectid, |
5e2a4b25 | 1550 | &fs_devices); |
f23c8af8 ID |
1551 | if (error) { |
1552 | kfree(subvol_name); | |
061dbc6b | 1553 | return ERR_PTR(error); |
f23c8af8 | 1554 | } |
edf24abe | 1555 | |
05dbe683 | 1556 | if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
fa330659 | 1557 | /* mount_subvol() will free subvol_name. */ |
bb289b7b OS |
1558 | return mount_subvol(subvol_name, subvol_objectid, flags, |
1559 | device_name, data); | |
830c4adb JB |
1560 | } |
1561 | ||
f667aef6 QW |
1562 | security_init_mnt_opts(&new_sec_opts); |
1563 | if (data) { | |
1564 | error = parse_security_options(data, &new_sec_opts); | |
1565 | if (error) | |
1566 | return ERR_PTR(error); | |
1567 | } | |
1568 | ||
306e16ce | 1569 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 1570 | if (error) |
f667aef6 | 1571 | goto error_sec_opts; |
4b82d6e4 | 1572 | |
450ba0ea JB |
1573 | /* |
1574 | * Setup a dummy root and fs_info for test/set super. This is because | |
1575 | * we don't actually fill this stuff out until open_ctree, but we need | |
1576 | * it for searching for existing supers, so this lets us do that and | |
1577 | * then open_ctree will properly initialize everything later. | |
1578 | */ | |
1579 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
f667aef6 QW |
1580 | if (!fs_info) { |
1581 | error = -ENOMEM; | |
1582 | goto error_sec_opts; | |
1583 | } | |
04d21a24 | 1584 | |
450ba0ea | 1585 | fs_info->fs_devices = fs_devices; |
450ba0ea | 1586 | |
6c41761f DS |
1587 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
1588 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
f667aef6 | 1589 | security_init_mnt_opts(&fs_info->security_opts); |
6c41761f DS |
1590 | if (!fs_info->super_copy || !fs_info->super_for_commit) { |
1591 | error = -ENOMEM; | |
04d21a24 ID |
1592 | goto error_fs_info; |
1593 | } | |
1594 | ||
1595 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1596 | if (error) | |
1597 | goto error_fs_info; | |
1598 | ||
1599 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1600 | error = -EACCES; | |
6c41761f DS |
1601 | goto error_close_devices; |
1602 | } | |
1603 | ||
dfe25020 | 1604 | bdev = fs_devices->latest_bdev; |
9249e17f DH |
1605 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
1606 | fs_info); | |
830c4adb JB |
1607 | if (IS_ERR(s)) { |
1608 | error = PTR_ERR(s); | |
1609 | goto error_close_devices; | |
1610 | } | |
4b82d6e4 Y |
1611 | |
1612 | if (s->s_root) { | |
2b82032c | 1613 | btrfs_close_devices(fs_devices); |
6c41761f | 1614 | free_fs_info(fs_info); |
59553edf AV |
1615 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1616 | error = -EBUSY; | |
4b82d6e4 | 1617 | } else { |
a1c6f057 | 1618 | snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); |
815745cf | 1619 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1620 | error = btrfs_fill_super(s, fs_devices, data, |
1621 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 1622 | } |
05dbe683 | 1623 | if (error) { |
f667aef6 | 1624 | deactivate_locked_super(s); |
f667aef6 QW |
1625 | goto error_sec_opts; |
1626 | } | |
1627 | ||
1628 | fs_info = btrfs_sb(s); | |
1629 | error = setup_security_options(fs_info, s, &new_sec_opts); | |
1630 | if (error) { | |
830c4adb | 1631 | deactivate_locked_super(s); |
f667aef6 QW |
1632 | goto error_sec_opts; |
1633 | } | |
4b82d6e4 | 1634 | |
05dbe683 | 1635 | return dget(s->s_root); |
4b82d6e4 | 1636 | |
c146afad | 1637 | error_close_devices: |
8a4b83cc | 1638 | btrfs_close_devices(fs_devices); |
04d21a24 | 1639 | error_fs_info: |
6c41761f | 1640 | free_fs_info(fs_info); |
f667aef6 QW |
1641 | error_sec_opts: |
1642 | security_free_mnt_opts(&new_sec_opts); | |
061dbc6b | 1643 | return ERR_PTR(error); |
4b82d6e4 | 1644 | } |
2e635a27 | 1645 | |
0d2450ab ST |
1646 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
1647 | int new_pool_size, int old_pool_size) | |
1648 | { | |
1649 | if (new_pool_size == old_pool_size) | |
1650 | return; | |
1651 | ||
1652 | fs_info->thread_pool_size = new_pool_size; | |
1653 | ||
efe120a0 | 1654 | btrfs_info(fs_info, "resize thread pool %d -> %d", |
0d2450ab ST |
1655 | old_pool_size, new_pool_size); |
1656 | ||
5cdc7ad3 | 1657 | btrfs_workqueue_set_max(fs_info->workers, new_pool_size); |
afe3d242 | 1658 | btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); |
a8c93d4e | 1659 | btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); |
e66f0bb1 | 1660 | btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); |
fccb5d86 QW |
1661 | btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); |
1662 | btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); | |
1663 | btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, | |
1664 | new_pool_size); | |
1665 | btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); | |
1666 | btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); | |
5b3bc44e | 1667 | btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); |
736cfa15 | 1668 | btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); |
0339ef2f QW |
1669 | btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, |
1670 | new_pool_size); | |
0d2450ab ST |
1671 | } |
1672 | ||
f42a34b2 | 1673 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
dc81cdc5 MX |
1674 | { |
1675 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
f42a34b2 | 1676 | } |
dc81cdc5 | 1677 | |
f42a34b2 MX |
1678 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
1679 | unsigned long old_opts, int flags) | |
1680 | { | |
dc81cdc5 MX |
1681 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1682 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1683 | (flags & MS_RDONLY))) { | |
1684 | /* wait for any defraggers to finish */ | |
1685 | wait_event(fs_info->transaction_wait, | |
1686 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1687 | if (flags & MS_RDONLY) | |
1688 | sync_filesystem(fs_info->sb); | |
1689 | } | |
1690 | } | |
1691 | ||
1692 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1693 | unsigned long old_opts) | |
1694 | { | |
1695 | /* | |
180e4d47 LB |
1696 | * We need to cleanup all defragable inodes if the autodefragment is |
1697 | * close or the filesystem is read only. | |
dc81cdc5 MX |
1698 | */ |
1699 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1700 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1701 | (fs_info->sb->s_flags & MS_RDONLY))) { | |
1702 | btrfs_cleanup_defrag_inodes(fs_info); | |
1703 | } | |
1704 | ||
1705 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1706 | } | |
1707 | ||
c146afad YZ |
1708 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1709 | { | |
815745cf AV |
1710 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1711 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1712 | unsigned old_flags = sb->s_flags; |
1713 | unsigned long old_opts = fs_info->mount_opt; | |
1714 | unsigned long old_compress_type = fs_info->compress_type; | |
1715 | u64 old_max_inline = fs_info->max_inline; | |
1716 | u64 old_alloc_start = fs_info->alloc_start; | |
1717 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1718 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
c146afad YZ |
1719 | int ret; |
1720 | ||
02b9984d | 1721 | sync_filesystem(sb); |
f42a34b2 | 1722 | btrfs_remount_prepare(fs_info); |
dc81cdc5 | 1723 | |
f667aef6 QW |
1724 | if (data) { |
1725 | struct security_mnt_opts new_sec_opts; | |
1726 | ||
1727 | security_init_mnt_opts(&new_sec_opts); | |
1728 | ret = parse_security_options(data, &new_sec_opts); | |
1729 | if (ret) | |
1730 | goto restore; | |
1731 | ret = setup_security_options(fs_info, sb, | |
1732 | &new_sec_opts); | |
1733 | if (ret) { | |
1734 | security_free_mnt_opts(&new_sec_opts); | |
1735 | goto restore; | |
1736 | } | |
1737 | } | |
1738 | ||
96da0919 | 1739 | ret = btrfs_parse_options(root, data, *flags); |
49b25e05 JM |
1740 | if (ret) { |
1741 | ret = -EINVAL; | |
1742 | goto restore; | |
1743 | } | |
b288052e | 1744 | |
f42a34b2 | 1745 | btrfs_remount_begin(fs_info, old_opts, *flags); |
0d2450ab ST |
1746 | btrfs_resize_thread_pool(fs_info, |
1747 | fs_info->thread_pool_size, old_thread_pool_size); | |
1748 | ||
c146afad | 1749 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
dc81cdc5 | 1750 | goto out; |
c146afad YZ |
1751 | |
1752 | if (*flags & MS_RDONLY) { | |
8dabb742 SB |
1753 | /* |
1754 | * this also happens on 'umount -rf' or on shutdown, when | |
1755 | * the filesystem is busy. | |
1756 | */ | |
21c7e756 | 1757 | cancel_work_sync(&fs_info->async_reclaim_work); |
361c093d SB |
1758 | |
1759 | /* wait for the uuid_scan task to finish */ | |
1760 | down(&fs_info->uuid_tree_rescan_sem); | |
1761 | /* avoid complains from lockdep et al. */ | |
1762 | up(&fs_info->uuid_tree_rescan_sem); | |
1763 | ||
c146afad YZ |
1764 | sb->s_flags |= MS_RDONLY; |
1765 | ||
e44163e1 JM |
1766 | /* |
1767 | * Setting MS_RDONLY will put the cleaner thread to | |
1768 | * sleep at the next loop if it's already active. | |
1769 | * If it's already asleep, we'll leave unused block | |
1770 | * groups on disk until we're mounted read-write again | |
1771 | * unless we clean them up here. | |
1772 | */ | |
e44163e1 | 1773 | btrfs_delete_unused_bgs(fs_info); |
e44163e1 | 1774 | |
8dabb742 SB |
1775 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1776 | btrfs_scrub_cancel(fs_info); | |
061594ef | 1777 | btrfs_pause_balance(fs_info); |
8dabb742 | 1778 | |
49b25e05 JM |
1779 | ret = btrfs_commit_super(root); |
1780 | if (ret) | |
1781 | goto restore; | |
c146afad | 1782 | } else { |
6ef3de9c DS |
1783 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
1784 | btrfs_err(fs_info, | |
efe120a0 | 1785 | "Remounting read-write after error is not allowed"); |
6ef3de9c DS |
1786 | ret = -EINVAL; |
1787 | goto restore; | |
1788 | } | |
8a3db184 | 1789 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1790 | ret = -EACCES; |
1791 | goto restore; | |
8a3db184 | 1792 | } |
2b82032c | 1793 | |
292fd7fc SB |
1794 | if (fs_info->fs_devices->missing_devices > |
1795 | fs_info->num_tolerated_disk_barrier_failures && | |
1796 | !(*flags & MS_RDONLY)) { | |
efe120a0 FH |
1797 | btrfs_warn(fs_info, |
1798 | "too many missing devices, writeable remount is not allowed"); | |
292fd7fc SB |
1799 | ret = -EACCES; |
1800 | goto restore; | |
1801 | } | |
1802 | ||
8a3db184 | 1803 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1804 | ret = -EINVAL; |
1805 | goto restore; | |
8a3db184 | 1806 | } |
c146afad | 1807 | |
815745cf | 1808 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1809 | if (ret) |
1810 | goto restore; | |
c146afad | 1811 | |
d68fc57b | 1812 | /* recover relocation */ |
5f316481 | 1813 | mutex_lock(&fs_info->cleaner_mutex); |
d68fc57b | 1814 | ret = btrfs_recover_relocation(root); |
5f316481 | 1815 | mutex_unlock(&fs_info->cleaner_mutex); |
49b25e05 JM |
1816 | if (ret) |
1817 | goto restore; | |
c146afad | 1818 | |
2b6ba629 ID |
1819 | ret = btrfs_resume_balance_async(fs_info); |
1820 | if (ret) | |
1821 | goto restore; | |
1822 | ||
8dabb742 SB |
1823 | ret = btrfs_resume_dev_replace_async(fs_info); |
1824 | if (ret) { | |
efe120a0 | 1825 | btrfs_warn(fs_info, "failed to resume dev_replace"); |
8dabb742 SB |
1826 | goto restore; |
1827 | } | |
94aebfb2 JB |
1828 | |
1829 | if (!fs_info->uuid_root) { | |
efe120a0 | 1830 | btrfs_info(fs_info, "creating UUID tree"); |
94aebfb2 JB |
1831 | ret = btrfs_create_uuid_tree(fs_info); |
1832 | if (ret) { | |
efe120a0 | 1833 | btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); |
94aebfb2 JB |
1834 | goto restore; |
1835 | } | |
1836 | } | |
c146afad | 1837 | sb->s_flags &= ~MS_RDONLY; |
90c711ab ZB |
1838 | |
1839 | fs_info->open = 1; | |
c146afad | 1840 | } |
dc81cdc5 | 1841 | out: |
2c6a92b0 | 1842 | wake_up_process(fs_info->transaction_kthread); |
dc81cdc5 | 1843 | btrfs_remount_cleanup(fs_info, old_opts); |
c146afad | 1844 | return 0; |
49b25e05 JM |
1845 | |
1846 | restore: | |
1847 | /* We've hit an error - don't reset MS_RDONLY */ | |
1848 | if (sb->s_flags & MS_RDONLY) | |
1849 | old_flags |= MS_RDONLY; | |
1850 | sb->s_flags = old_flags; | |
1851 | fs_info->mount_opt = old_opts; | |
1852 | fs_info->compress_type = old_compress_type; | |
1853 | fs_info->max_inline = old_max_inline; | |
c018daec | 1854 | mutex_lock(&fs_info->chunk_mutex); |
49b25e05 | 1855 | fs_info->alloc_start = old_alloc_start; |
c018daec | 1856 | mutex_unlock(&fs_info->chunk_mutex); |
0d2450ab ST |
1857 | btrfs_resize_thread_pool(fs_info, |
1858 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 | 1859 | fs_info->metadata_ratio = old_metadata_ratio; |
dc81cdc5 | 1860 | btrfs_remount_cleanup(fs_info, old_opts); |
49b25e05 | 1861 | return ret; |
c146afad YZ |
1862 | } |
1863 | ||
bcd53741 AJ |
1864 | /* Used to sort the devices by max_avail(descending sort) */ |
1865 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1866 | const void *dev_info2) | |
1867 | { | |
1868 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1869 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1870 | return -1; | |
1871 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1872 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1873 | return 1; | |
1874 | else | |
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | /* | |
1879 | * sort the devices by max_avail, in which max free extent size of each device | |
1880 | * is stored.(Descending Sort) | |
1881 | */ | |
1882 | static inline void btrfs_descending_sort_devices( | |
1883 | struct btrfs_device_info *devices, | |
1884 | size_t nr_devices) | |
1885 | { | |
1886 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1887 | btrfs_cmp_device_free_bytes, NULL); | |
1888 | } | |
1889 | ||
6d07bcec MX |
1890 | /* |
1891 | * The helper to calc the free space on the devices that can be used to store | |
1892 | * file data. | |
1893 | */ | |
1894 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1895 | { | |
1896 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1897 | struct btrfs_device_info *devices_info; | |
1898 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1899 | struct btrfs_device *device; | |
1900 | u64 skip_space; | |
1901 | u64 type; | |
1902 | u64 avail_space; | |
1903 | u64 used_space; | |
1904 | u64 min_stripe_size; | |
39fb26c3 | 1905 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1906 | int i = 0, nr_devices; |
1907 | int ret; | |
1908 | ||
7e33fd99 | 1909 | /* |
01327610 | 1910 | * We aren't under the device list lock, so this is racy-ish, but good |
7e33fd99 JB |
1911 | * enough for our purposes. |
1912 | */ | |
b772a86e | 1913 | nr_devices = fs_info->fs_devices->open_devices; |
7e33fd99 JB |
1914 | if (!nr_devices) { |
1915 | smp_mb(); | |
1916 | nr_devices = fs_info->fs_devices->open_devices; | |
1917 | ASSERT(nr_devices); | |
1918 | if (!nr_devices) { | |
1919 | *free_bytes = 0; | |
1920 | return 0; | |
1921 | } | |
1922 | } | |
6d07bcec | 1923 | |
d9b0d9ba | 1924 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
6d07bcec MX |
1925 | GFP_NOFS); |
1926 | if (!devices_info) | |
1927 | return -ENOMEM; | |
1928 | ||
01327610 | 1929 | /* calc min stripe number for data space allocation */ |
6d07bcec | 1930 | type = btrfs_get_alloc_profile(root, 1); |
39fb26c3 | 1931 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1932 | min_stripes = 2; |
39fb26c3 MX |
1933 | num_stripes = nr_devices; |
1934 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1935 | min_stripes = 2; |
39fb26c3 MX |
1936 | num_stripes = 2; |
1937 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1938 | min_stripes = 4; |
39fb26c3 MX |
1939 | num_stripes = 4; |
1940 | } | |
6d07bcec MX |
1941 | |
1942 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1943 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1944 | else | |
1945 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1946 | ||
7e33fd99 JB |
1947 | if (fs_info->alloc_start) |
1948 | mutex_lock(&fs_devices->device_list_mutex); | |
1949 | rcu_read_lock(); | |
1950 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { | |
63a212ab SB |
1951 | if (!device->in_fs_metadata || !device->bdev || |
1952 | device->is_tgtdev_for_dev_replace) | |
6d07bcec MX |
1953 | continue; |
1954 | ||
7e33fd99 JB |
1955 | if (i >= nr_devices) |
1956 | break; | |
1957 | ||
6d07bcec MX |
1958 | avail_space = device->total_bytes - device->bytes_used; |
1959 | ||
1960 | /* align with stripe_len */ | |
f8c269d7 | 1961 | avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); |
6d07bcec MX |
1962 | avail_space *= BTRFS_STRIPE_LEN; |
1963 | ||
1964 | /* | |
01327610 | 1965 | * In order to avoid overwriting the superblock on the drive, |
6d07bcec MX |
1966 | * btrfs starts at an offset of at least 1MB when doing chunk |
1967 | * allocation. | |
1968 | */ | |
ee22184b | 1969 | skip_space = SZ_1M; |
6d07bcec MX |
1970 | |
1971 | /* user can set the offset in fs_info->alloc_start. */ | |
7e33fd99 JB |
1972 | if (fs_info->alloc_start && |
1973 | fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1974 | device->total_bytes) { | |
1975 | rcu_read_unlock(); | |
6d07bcec MX |
1976 | skip_space = max(fs_info->alloc_start, skip_space); |
1977 | ||
7e33fd99 JB |
1978 | /* |
1979 | * btrfs can not use the free space in | |
1980 | * [0, skip_space - 1], we must subtract it from the | |
1981 | * total. In order to implement it, we account the used | |
1982 | * space in this range first. | |
1983 | */ | |
1984 | ret = btrfs_account_dev_extents_size(device, 0, | |
1985 | skip_space - 1, | |
1986 | &used_space); | |
1987 | if (ret) { | |
1988 | kfree(devices_info); | |
1989 | mutex_unlock(&fs_devices->device_list_mutex); | |
1990 | return ret; | |
1991 | } | |
1992 | ||
1993 | rcu_read_lock(); | |
6d07bcec | 1994 | |
7e33fd99 JB |
1995 | /* calc the free space in [0, skip_space - 1] */ |
1996 | skip_space -= used_space; | |
1997 | } | |
6d07bcec MX |
1998 | |
1999 | /* | |
2000 | * we can use the free space in [0, skip_space - 1], subtract | |
2001 | * it from the total. | |
2002 | */ | |
2003 | if (avail_space && avail_space >= skip_space) | |
2004 | avail_space -= skip_space; | |
2005 | else | |
2006 | avail_space = 0; | |
2007 | ||
2008 | if (avail_space < min_stripe_size) | |
2009 | continue; | |
2010 | ||
2011 | devices_info[i].dev = device; | |
2012 | devices_info[i].max_avail = avail_space; | |
2013 | ||
2014 | i++; | |
2015 | } | |
7e33fd99 JB |
2016 | rcu_read_unlock(); |
2017 | if (fs_info->alloc_start) | |
2018 | mutex_unlock(&fs_devices->device_list_mutex); | |
6d07bcec MX |
2019 | |
2020 | nr_devices = i; | |
2021 | ||
2022 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
2023 | ||
2024 | i = nr_devices - 1; | |
2025 | avail_space = 0; | |
2026 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
2027 | if (num_stripes > nr_devices) |
2028 | num_stripes = nr_devices; | |
2029 | ||
6d07bcec MX |
2030 | if (devices_info[i].max_avail >= min_stripe_size) { |
2031 | int j; | |
2032 | u64 alloc_size; | |
2033 | ||
39fb26c3 | 2034 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 2035 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 2036 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
2037 | devices_info[j].max_avail -= alloc_size; |
2038 | } | |
2039 | i--; | |
2040 | nr_devices--; | |
2041 | } | |
2042 | ||
2043 | kfree(devices_info); | |
2044 | *free_bytes = avail_space; | |
2045 | return 0; | |
2046 | } | |
2047 | ||
ba7b6e62 DS |
2048 | /* |
2049 | * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. | |
2050 | * | |
2051 | * If there's a redundant raid level at DATA block groups, use the respective | |
2052 | * multiplier to scale the sizes. | |
2053 | * | |
2054 | * Unused device space usage is based on simulating the chunk allocator | |
2055 | * algorithm that respects the device sizes, order of allocations and the | |
2056 | * 'alloc_start' value, this is a close approximation of the actual use but | |
2057 | * there are other factors that may change the result (like a new metadata | |
2058 | * chunk). | |
2059 | * | |
ca8a51b3 | 2060 | * If metadata is exhausted, f_bavail will be 0. |
ba7b6e62 | 2061 | */ |
8fd17795 CM |
2062 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2063 | { | |
815745cf AV |
2064 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
2065 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
2066 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
2067 | struct btrfs_space_info *found; |
2068 | u64 total_used = 0; | |
6d07bcec | 2069 | u64 total_free_data = 0; |
ca8a51b3 | 2070 | u64 total_free_meta = 0; |
db94535d | 2071 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 2072 | __be32 *fsid = (__be32 *)fs_info->fsid; |
ba7b6e62 DS |
2073 | unsigned factor = 1; |
2074 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
6d07bcec | 2075 | int ret; |
ca8a51b3 | 2076 | u64 thresh = 0; |
ae02d1bd | 2077 | int mixed = 0; |
8fd17795 | 2078 | |
15484377 | 2079 | /* |
180e4d47 | 2080 | * holding chunk_mutex to avoid allocating new chunks, holding |
15484377 MX |
2081 | * device_list_mutex to avoid the device being removed |
2082 | */ | |
bd4d1088 | 2083 | rcu_read_lock(); |
89a55897 | 2084 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec | 2085 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
ba7b6e62 DS |
2086 | int i; |
2087 | ||
6d07bcec MX |
2088 | total_free_data += found->disk_total - found->disk_used; |
2089 | total_free_data -= | |
2090 | btrfs_account_ro_block_groups_free_space(found); | |
ba7b6e62 DS |
2091 | |
2092 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
2093 | if (!list_empty(&found->block_groups[i])) { | |
2094 | switch (i) { | |
2095 | case BTRFS_RAID_DUP: | |
2096 | case BTRFS_RAID_RAID1: | |
2097 | case BTRFS_RAID_RAID10: | |
2098 | factor = 2; | |
2099 | } | |
2100 | } | |
2101 | } | |
6d07bcec | 2102 | } |
ae02d1bd LB |
2103 | |
2104 | /* | |
2105 | * Metadata in mixed block goup profiles are accounted in data | |
2106 | */ | |
2107 | if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
2108 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) | |
2109 | mixed = 1; | |
2110 | else | |
2111 | total_free_meta += found->disk_total - | |
2112 | found->disk_used; | |
2113 | } | |
6d07bcec | 2114 | |
b742bb82 | 2115 | total_used += found->disk_used; |
89a55897 | 2116 | } |
ba7b6e62 | 2117 | |
bd4d1088 JB |
2118 | rcu_read_unlock(); |
2119 | ||
ba7b6e62 DS |
2120 | buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); |
2121 | buf->f_blocks >>= bits; | |
2122 | buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); | |
2123 | ||
2124 | /* Account global block reserve as used, it's in logical size already */ | |
2125 | spin_lock(&block_rsv->lock); | |
41b34acc LB |
2126 | /* Mixed block groups accounting is not byte-accurate, avoid overflow */ |
2127 | if (buf->f_bfree >= block_rsv->size >> bits) | |
2128 | buf->f_bfree -= block_rsv->size >> bits; | |
2129 | else | |
2130 | buf->f_bfree = 0; | |
ba7b6e62 DS |
2131 | spin_unlock(&block_rsv->lock); |
2132 | ||
0d95c1be | 2133 | buf->f_bavail = div_u64(total_free_data, factor); |
815745cf | 2134 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
7e33fd99 | 2135 | if (ret) |
6d07bcec | 2136 | return ret; |
ba7b6e62 | 2137 | buf->f_bavail += div_u64(total_free_data, factor); |
6d07bcec | 2138 | buf->f_bavail = buf->f_bavail >> bits; |
d397712b | 2139 | |
ca8a51b3 DS |
2140 | /* |
2141 | * We calculate the remaining metadata space minus global reserve. If | |
2142 | * this is (supposedly) smaller than zero, there's no space. But this | |
2143 | * does not hold in practice, the exhausted state happens where's still | |
2144 | * some positive delta. So we apply some guesswork and compare the | |
2145 | * delta to a 4M threshold. (Practically observed delta was ~2M.) | |
2146 | * | |
2147 | * We probably cannot calculate the exact threshold value because this | |
2148 | * depends on the internal reservations requested by various | |
2149 | * operations, so some operations that consume a few metadata will | |
2150 | * succeed even if the Avail is zero. But this is better than the other | |
2151 | * way around. | |
2152 | */ | |
2153 | thresh = 4 * 1024 * 1024; | |
2154 | ||
ae02d1bd | 2155 | if (!mixed && total_free_meta - thresh < block_rsv->size) |
ca8a51b3 DS |
2156 | buf->f_bavail = 0; |
2157 | ||
ba7b6e62 DS |
2158 | buf->f_type = BTRFS_SUPER_MAGIC; |
2159 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2160 | buf->f_namelen = BTRFS_NAME_LEN; | |
2161 | ||
9d03632e | 2162 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 2163 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
2164 | on a big-endian or little-endian host */ |
2165 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
2166 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 | 2167 | /* Mask in the root object ID too, to disambiguate subvols */ |
2b0143b5 DH |
2168 | buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; |
2169 | buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; | |
32d48fa1 | 2170 | |
8fd17795 CM |
2171 | return 0; |
2172 | } | |
b5133862 | 2173 | |
aea52e19 AV |
2174 | static void btrfs_kill_super(struct super_block *sb) |
2175 | { | |
815745cf | 2176 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 2177 | kill_anon_super(sb); |
d22ca7de | 2178 | free_fs_info(fs_info); |
aea52e19 AV |
2179 | } |
2180 | ||
2e635a27 CM |
2181 | static struct file_system_type btrfs_fs_type = { |
2182 | .owner = THIS_MODULE, | |
2183 | .name = "btrfs", | |
061dbc6b | 2184 | .mount = btrfs_mount, |
aea52e19 | 2185 | .kill_sb = btrfs_kill_super, |
f667aef6 | 2186 | .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, |
2e635a27 | 2187 | }; |
7f78e035 | 2188 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 2189 | |
d8620958 TVB |
2190 | static int btrfs_control_open(struct inode *inode, struct file *file) |
2191 | { | |
2192 | /* | |
2193 | * The control file's private_data is used to hold the | |
2194 | * transaction when it is started and is used to keep | |
2195 | * track of whether a transaction is already in progress. | |
2196 | */ | |
2197 | file->private_data = NULL; | |
2198 | return 0; | |
2199 | } | |
2200 | ||
d352ac68 CM |
2201 | /* |
2202 | * used by btrfsctl to scan devices when no FS is mounted | |
2203 | */ | |
8a4b83cc CM |
2204 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
2205 | unsigned long arg) | |
2206 | { | |
2207 | struct btrfs_ioctl_vol_args *vol; | |
2208 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 2209 | int ret = -ENOTTY; |
8a4b83cc | 2210 | |
e441d54d CM |
2211 | if (!capable(CAP_SYS_ADMIN)) |
2212 | return -EPERM; | |
2213 | ||
dae7b665 LZ |
2214 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
2215 | if (IS_ERR(vol)) | |
2216 | return PTR_ERR(vol); | |
c071fcfd | 2217 | |
8a4b83cc CM |
2218 | switch (cmd) { |
2219 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 2220 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
2221 | &btrfs_fs_type, &fs_devices); |
2222 | break; | |
02db0844 JB |
2223 | case BTRFS_IOC_DEVICES_READY: |
2224 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
2225 | &btrfs_fs_type, &fs_devices); | |
2226 | if (ret) | |
2227 | break; | |
2228 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
2229 | break; | |
c5868f83 | 2230 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 2231 | ret = btrfs_ioctl_get_supported_features((void __user*)arg); |
c5868f83 | 2232 | break; |
8a4b83cc | 2233 | } |
dae7b665 | 2234 | |
8a4b83cc | 2235 | kfree(vol); |
f819d837 | 2236 | return ret; |
8a4b83cc CM |
2237 | } |
2238 | ||
0176260f | 2239 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 2240 | { |
354aa0fb MX |
2241 | struct btrfs_trans_handle *trans; |
2242 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
2243 | ||
d4edf39b | 2244 | trans = btrfs_attach_transaction_barrier(root); |
354aa0fb MX |
2245 | if (IS_ERR(trans)) { |
2246 | /* no transaction, don't bother */ | |
2247 | if (PTR_ERR(trans) == -ENOENT) | |
2248 | return 0; | |
2249 | return PTR_ERR(trans); | |
2250 | } | |
2251 | return btrfs_commit_transaction(trans, root); | |
ed0dab6b Y |
2252 | } |
2253 | ||
9c5085c1 JB |
2254 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
2255 | { | |
2256 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
2257 | struct btrfs_fs_devices *cur_devices; | |
2258 | struct btrfs_device *dev, *first_dev = NULL; | |
2259 | struct list_head *head; | |
2260 | struct rcu_string *name; | |
2261 | ||
2262 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
2263 | cur_devices = fs_info->fs_devices; | |
2264 | while (cur_devices) { | |
2265 | head = &cur_devices->devices; | |
2266 | list_for_each_entry(dev, head, dev_list) { | |
aa9ddcd4 JB |
2267 | if (dev->missing) |
2268 | continue; | |
0aeb8a6e AJ |
2269 | if (!dev->name) |
2270 | continue; | |
9c5085c1 JB |
2271 | if (!first_dev || dev->devid < first_dev->devid) |
2272 | first_dev = dev; | |
2273 | } | |
2274 | cur_devices = cur_devices->seed; | |
2275 | } | |
2276 | ||
2277 | if (first_dev) { | |
2278 | rcu_read_lock(); | |
2279 | name = rcu_dereference(first_dev->name); | |
2280 | seq_escape(m, name->str, " \t\n\\"); | |
2281 | rcu_read_unlock(); | |
2282 | } else { | |
2283 | WARN_ON(1); | |
2284 | } | |
2285 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
2286 | return 0; | |
2287 | } | |
2288 | ||
b87221de | 2289 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 2290 | .drop_inode = btrfs_drop_inode, |
bd555975 | 2291 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 2292 | .put_super = btrfs_put_super, |
d5719762 | 2293 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 2294 | .show_options = btrfs_show_options, |
9c5085c1 | 2295 | .show_devname = btrfs_show_devname, |
4730a4bc | 2296 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
2297 | .alloc_inode = btrfs_alloc_inode, |
2298 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2299 | .statfs = btrfs_statfs, |
c146afad | 2300 | .remount_fs = btrfs_remount, |
0176260f | 2301 | .freeze_fs = btrfs_freeze, |
e20d96d6 | 2302 | }; |
a9218f6b CM |
2303 | |
2304 | static const struct file_operations btrfs_ctl_fops = { | |
d8620958 | 2305 | .open = btrfs_control_open, |
a9218f6b CM |
2306 | .unlocked_ioctl = btrfs_control_ioctl, |
2307 | .compat_ioctl = btrfs_control_ioctl, | |
2308 | .owner = THIS_MODULE, | |
6038f373 | 2309 | .llseek = noop_llseek, |
a9218f6b CM |
2310 | }; |
2311 | ||
2312 | static struct miscdevice btrfs_misc = { | |
578454ff | 2313 | .minor = BTRFS_MINOR, |
a9218f6b CM |
2314 | .name = "btrfs-control", |
2315 | .fops = &btrfs_ctl_fops | |
2316 | }; | |
2317 | ||
578454ff KS |
2318 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
2319 | MODULE_ALIAS("devname:btrfs-control"); | |
2320 | ||
a9218f6b CM |
2321 | static int btrfs_interface_init(void) |
2322 | { | |
2323 | return misc_register(&btrfs_misc); | |
2324 | } | |
2325 | ||
b2950863 | 2326 | static void btrfs_interface_exit(void) |
a9218f6b | 2327 | { |
f368ed60 | 2328 | misc_deregister(&btrfs_misc); |
a9218f6b CM |
2329 | } |
2330 | ||
8ae1af3c | 2331 | static void btrfs_print_mod_info(void) |
85965600 | 2332 | { |
5f9e1059 | 2333 | printk(KERN_INFO "Btrfs loaded, crc32c=%s" |
85965600 DS |
2334 | #ifdef CONFIG_BTRFS_DEBUG |
2335 | ", debug=on" | |
2336 | #endif | |
79556c3d SB |
2337 | #ifdef CONFIG_BTRFS_ASSERT |
2338 | ", assert=on" | |
2339 | #endif | |
85965600 DS |
2340 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
2341 | ", integrity-checker=on" | |
2342 | #endif | |
5f9e1059 JM |
2343 | "\n", |
2344 | btrfs_crc32c_impl()); | |
85965600 DS |
2345 | } |
2346 | ||
2e635a27 CM |
2347 | static int __init init_btrfs_fs(void) |
2348 | { | |
2c90e5d6 | 2349 | int err; |
58176a96 | 2350 | |
14a958e6 FDBM |
2351 | err = btrfs_hash_init(); |
2352 | if (err) | |
2353 | return err; | |
2354 | ||
63541927 FDBM |
2355 | btrfs_props_init(); |
2356 | ||
58176a96 JB |
2357 | err = btrfs_init_sysfs(); |
2358 | if (err) | |
14a958e6 | 2359 | goto free_hash; |
58176a96 | 2360 | |
143bede5 | 2361 | btrfs_init_compress(); |
d1310b2e | 2362 | |
261507a0 LZ |
2363 | err = btrfs_init_cachep(); |
2364 | if (err) | |
2365 | goto free_compress; | |
2366 | ||
d1310b2e | 2367 | err = extent_io_init(); |
2f4cbe64 WB |
2368 | if (err) |
2369 | goto free_cachep; | |
2370 | ||
d1310b2e CM |
2371 | err = extent_map_init(); |
2372 | if (err) | |
2373 | goto free_extent_io; | |
2374 | ||
6352b91d | 2375 | err = ordered_data_init(); |
2f4cbe64 WB |
2376 | if (err) |
2377 | goto free_extent_map; | |
c8b97818 | 2378 | |
6352b91d MX |
2379 | err = btrfs_delayed_inode_init(); |
2380 | if (err) | |
2381 | goto free_ordered_data; | |
2382 | ||
9247f317 | 2383 | err = btrfs_auto_defrag_init(); |
16cdcec7 MX |
2384 | if (err) |
2385 | goto free_delayed_inode; | |
2386 | ||
78a6184a | 2387 | err = btrfs_delayed_ref_init(); |
9247f317 MX |
2388 | if (err) |
2389 | goto free_auto_defrag; | |
2390 | ||
b9e9a6cb WS |
2391 | err = btrfs_prelim_ref_init(); |
2392 | if (err) | |
af13b492 | 2393 | goto free_delayed_ref; |
b9e9a6cb | 2394 | |
97eb6b69 | 2395 | err = btrfs_end_io_wq_init(); |
78a6184a | 2396 | if (err) |
af13b492 | 2397 | goto free_prelim_ref; |
78a6184a | 2398 | |
97eb6b69 DS |
2399 | err = btrfs_interface_init(); |
2400 | if (err) | |
2401 | goto free_end_io_wq; | |
2402 | ||
e565d4b9 JS |
2403 | btrfs_init_lockdep(); |
2404 | ||
8ae1af3c | 2405 | btrfs_print_mod_info(); |
dc11dd5d JB |
2406 | |
2407 | err = btrfs_run_sanity_tests(); | |
2408 | if (err) | |
2409 | goto unregister_ioctl; | |
2410 | ||
2411 | err = register_filesystem(&btrfs_fs_type); | |
2412 | if (err) | |
2413 | goto unregister_ioctl; | |
74255aa0 | 2414 | |
2f4cbe64 WB |
2415 | return 0; |
2416 | ||
a9218f6b CM |
2417 | unregister_ioctl: |
2418 | btrfs_interface_exit(); | |
97eb6b69 DS |
2419 | free_end_io_wq: |
2420 | btrfs_end_io_wq_exit(); | |
b9e9a6cb WS |
2421 | free_prelim_ref: |
2422 | btrfs_prelim_ref_exit(); | |
78a6184a MX |
2423 | free_delayed_ref: |
2424 | btrfs_delayed_ref_exit(); | |
9247f317 MX |
2425 | free_auto_defrag: |
2426 | btrfs_auto_defrag_exit(); | |
16cdcec7 MX |
2427 | free_delayed_inode: |
2428 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
2429 | free_ordered_data: |
2430 | ordered_data_exit(); | |
2f4cbe64 WB |
2431 | free_extent_map: |
2432 | extent_map_exit(); | |
d1310b2e CM |
2433 | free_extent_io: |
2434 | extent_io_exit(); | |
2f4cbe64 WB |
2435 | free_cachep: |
2436 | btrfs_destroy_cachep(); | |
261507a0 LZ |
2437 | free_compress: |
2438 | btrfs_exit_compress(); | |
2f4cbe64 | 2439 | btrfs_exit_sysfs(); |
14a958e6 FDBM |
2440 | free_hash: |
2441 | btrfs_hash_exit(); | |
2f4cbe64 | 2442 | return err; |
2e635a27 CM |
2443 | } |
2444 | ||
2445 | static void __exit exit_btrfs_fs(void) | |
2446 | { | |
39279cc3 | 2447 | btrfs_destroy_cachep(); |
78a6184a | 2448 | btrfs_delayed_ref_exit(); |
9247f317 | 2449 | btrfs_auto_defrag_exit(); |
16cdcec7 | 2450 | btrfs_delayed_inode_exit(); |
b9e9a6cb | 2451 | btrfs_prelim_ref_exit(); |
6352b91d | 2452 | ordered_data_exit(); |
a52d9a80 | 2453 | extent_map_exit(); |
d1310b2e | 2454 | extent_io_exit(); |
a9218f6b | 2455 | btrfs_interface_exit(); |
5ed5f588 | 2456 | btrfs_end_io_wq_exit(); |
2e635a27 | 2457 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 2458 | btrfs_exit_sysfs(); |
8a4b83cc | 2459 | btrfs_cleanup_fs_uuids(); |
261507a0 | 2460 | btrfs_exit_compress(); |
14a958e6 | 2461 | btrfs_hash_exit(); |
2e635a27 CM |
2462 | } |
2463 | ||
60efa5eb | 2464 | late_initcall(init_btrfs_fs); |
2e635a27 CM |
2465 | module_exit(exit_btrfs_fs) |
2466 | ||
2467 | MODULE_LICENSE("GPL"); |