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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 | |
62e85577 | 154 | pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", |
08748810 | 155 | sb->s_id, function, line, errno, errstr, &vaf); |
37252a66 | 156 | va_end(args); |
4da35113 | 157 | } else { |
62e85577 | 158 | pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s\n", |
08748810 | 159 | sb->s_id, function, line, errno, errstr); |
4da35113 | 160 | } |
57d816a1 | 161 | #endif |
acce952b | 162 | |
0713d90c AJ |
163 | /* |
164 | * Today we only save the error info to memory. Long term we'll | |
165 | * also send it down to the disk | |
166 | */ | |
167 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); | |
168 | ||
4da35113 | 169 | /* Don't go through full error handling during mount */ |
cf79ffb5 | 170 | if (sb->s_flags & MS_BORN) |
4da35113 | 171 | btrfs_handle_error(fs_info); |
4da35113 | 172 | } |
acce952b | 173 | |
57d816a1 | 174 | #ifdef CONFIG_PRINTK |
533574c6 | 175 | static const char * const logtypes[] = { |
4da35113 JM |
176 | "emergency", |
177 | "alert", | |
178 | "critical", | |
179 | "error", | |
180 | "warning", | |
181 | "notice", | |
182 | "info", | |
183 | "debug", | |
184 | }; | |
185 | ||
35f4e5e6 NB |
186 | |
187 | /* | |
188 | * Use one ratelimit state per log level so that a flood of less important | |
189 | * messages doesn't cause more important ones to be dropped. | |
190 | */ | |
191 | static struct ratelimit_state printk_limits[] = { | |
192 | RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100), | |
193 | RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100), | |
194 | RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100), | |
195 | RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100), | |
196 | RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100), | |
197 | RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100), | |
198 | RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100), | |
199 | RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100), | |
200 | }; | |
201 | ||
c2cf52eb | 202 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
4da35113 JM |
203 | { |
204 | struct super_block *sb = fs_info->sb; | |
205 | char lvl[4]; | |
206 | struct va_format vaf; | |
207 | va_list args; | |
208 | const char *type = logtypes[4]; | |
533574c6 | 209 | int kern_level; |
35f4e5e6 | 210 | struct ratelimit_state *ratelimit; |
4da35113 JM |
211 | |
212 | va_start(args, fmt); | |
213 | ||
533574c6 JP |
214 | kern_level = printk_get_level(fmt); |
215 | if (kern_level) { | |
216 | size_t size = printk_skip_level(fmt) - fmt; | |
217 | memcpy(lvl, fmt, size); | |
218 | lvl[size] = '\0'; | |
219 | fmt += size; | |
220 | type = logtypes[kern_level - '0']; | |
35f4e5e6 NB |
221 | ratelimit = &printk_limits[kern_level - '0']; |
222 | } else { | |
4da35113 | 223 | *lvl = '\0'; |
35f4e5e6 NB |
224 | /* Default to debug output */ |
225 | ratelimit = &printk_limits[7]; | |
226 | } | |
4da35113 JM |
227 | |
228 | vaf.fmt = fmt; | |
229 | vaf.va = &args; | |
533574c6 | 230 | |
35f4e5e6 NB |
231 | if (__ratelimit(ratelimit)) |
232 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); | |
533574c6 JP |
233 | |
234 | va_end(args); | |
235 | } | |
533574c6 | 236 | #endif |
acce952b | 237 | |
49b25e05 JM |
238 | /* |
239 | * We only mark the transaction aborted and then set the file system read-only. | |
240 | * This will prevent new transactions from starting or trying to join this | |
241 | * one. | |
242 | * | |
243 | * This means that error recovery at the call site is limited to freeing | |
244 | * any local memory allocations and passing the error code up without | |
245 | * further cleanup. The transaction should complete as it normally would | |
246 | * in the call path but will return -EIO. | |
247 | * | |
248 | * We'll complete the cleanup in btrfs_end_transaction and | |
249 | * btrfs_commit_transaction. | |
250 | */ | |
c0d19e2b | 251 | __cold |
49b25e05 | 252 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, |
66642832 | 253 | const char *function, |
49b25e05 JM |
254 | unsigned int line, int errno) |
255 | { | |
66642832 JM |
256 | struct btrfs_fs_info *fs_info = trans->fs_info; |
257 | ||
49b25e05 JM |
258 | trans->aborted = errno; |
259 | /* Nothing used. The other threads that have joined this | |
260 | * transaction may be able to continue. */ | |
64c12921 | 261 | if (!trans->dirty && list_empty(&trans->new_bgs)) { |
69ce977a MX |
262 | const char *errstr; |
263 | ||
08748810 | 264 | errstr = btrfs_decode_error(errno); |
66642832 | 265 | btrfs_warn(fs_info, |
c2cf52eb SK |
266 | "%s:%d: Aborting unused transaction(%s).", |
267 | function, line, errstr); | |
acce952b | 268 | return; |
49b25e05 | 269 | } |
8d25a086 | 270 | ACCESS_ONCE(trans->transaction->aborted) = errno; |
501407aa | 271 | /* Wake up anybody who may be waiting on this transaction */ |
66642832 JM |
272 | wake_up(&fs_info->transaction_wait); |
273 | wake_up(&fs_info->transaction_blocked_wait); | |
274 | __btrfs_handle_fs_error(fs_info, function, line, errno, NULL); | |
49b25e05 | 275 | } |
8c342930 JM |
276 | /* |
277 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
278 | * issues an alert, and either panics or BUGs, depending on mount options. | |
279 | */ | |
c0d19e2b | 280 | __cold |
8c342930 JM |
281 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, |
282 | unsigned int line, int errno, const char *fmt, ...) | |
283 | { | |
8c342930 JM |
284 | char *s_id = "<unknown>"; |
285 | const char *errstr; | |
286 | struct va_format vaf = { .fmt = fmt }; | |
287 | va_list args; | |
acce952b | 288 | |
8c342930 JM |
289 | if (fs_info) |
290 | s_id = fs_info->sb->s_id; | |
acce952b | 291 | |
8c342930 JM |
292 | va_start(args, fmt); |
293 | vaf.va = &args; | |
294 | ||
08748810 | 295 | errstr = btrfs_decode_error(errno); |
aa43a17c | 296 | if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) |
08748810 DS |
297 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
298 | s_id, function, line, &vaf, errno, errstr); | |
8c342930 | 299 | |
efe120a0 FH |
300 | btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", |
301 | function, line, &vaf, errno, errstr); | |
8c342930 JM |
302 | va_end(args); |
303 | /* Caller calls BUG() */ | |
acce952b | 304 | } |
305 | ||
d397712b | 306 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 307 | { |
6bccf3ab | 308 | close_ctree(btrfs_sb(sb)); |
75dfe396 CM |
309 | } |
310 | ||
95e05289 | 311 | enum { |
73f73415 | 312 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
313 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
314 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
261507a0 LZ |
315 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
316 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
70f6d82e OS |
317 | Opt_space_cache, Opt_space_cache_version, Opt_clear_cache, |
318 | Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid, | |
319 | Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery, | |
320 | Opt_skip_balance, Opt_check_integrity, | |
321 | Opt_check_integrity_including_extent_data, | |
f420ee1e | 322 | Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, |
e07a2ade | 323 | Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, |
a258af7a | 324 | Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, |
8dcddfa0 | 325 | Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot, |
fed8f166 | 326 | Opt_nologreplay, Opt_norecovery, |
d0bd4560 JB |
327 | #ifdef CONFIG_BTRFS_DEBUG |
328 | Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, | |
329 | #endif | |
9555c6c1 | 330 | Opt_err, |
95e05289 CM |
331 | }; |
332 | ||
4d4ab6d6 | 333 | static const match_table_t tokens = { |
dfe25020 | 334 | {Opt_degraded, "degraded"}, |
95e05289 | 335 | {Opt_subvol, "subvol=%s"}, |
1493381f | 336 | {Opt_subvolid, "subvolid=%s"}, |
43e570b0 | 337 | {Opt_device, "device=%s"}, |
b6cda9bc | 338 | {Opt_nodatasum, "nodatasum"}, |
d399167d | 339 | {Opt_datasum, "datasum"}, |
be20aa9d | 340 | {Opt_nodatacow, "nodatacow"}, |
a258af7a | 341 | {Opt_datacow, "datacow"}, |
21ad10cf | 342 | {Opt_nobarrier, "nobarrier"}, |
842bef58 | 343 | {Opt_barrier, "barrier"}, |
6f568d35 | 344 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 345 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 346 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 347 | {Opt_compress, "compress"}, |
261507a0 | 348 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 349 | {Opt_compress_force, "compress-force"}, |
261507a0 | 350 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 351 | {Opt_ssd, "ssd"}, |
451d7585 | 352 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 353 | {Opt_nossd, "nossd"}, |
bd0330ad | 354 | {Opt_acl, "acl"}, |
33268eaf | 355 | {Opt_noacl, "noacl"}, |
3a5e1404 | 356 | {Opt_notreelog, "notreelog"}, |
a88998f2 | 357 | {Opt_treelog, "treelog"}, |
96da0919 | 358 | {Opt_nologreplay, "nologreplay"}, |
fed8f166 | 359 | {Opt_norecovery, "norecovery"}, |
dccae999 | 360 | {Opt_flushoncommit, "flushoncommit"}, |
2c9ee856 | 361 | {Opt_noflushoncommit, "noflushoncommit"}, |
97e728d4 | 362 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 363 | {Opt_discard, "discard"}, |
e07a2ade | 364 | {Opt_nodiscard, "nodiscard"}, |
0af3d00b | 365 | {Opt_space_cache, "space_cache"}, |
70f6d82e | 366 | {Opt_space_cache_version, "space_cache=%s"}, |
88c2ba3b | 367 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 368 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 369 | {Opt_enospc_debug, "enospc_debug"}, |
53036293 | 370 | {Opt_noenospc_debug, "noenospc_debug"}, |
e15d0542 | 371 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 372 | {Opt_defrag, "autodefrag"}, |
fc0ca9af | 373 | {Opt_nodefrag, "noautodefrag"}, |
4b9465cb | 374 | {Opt_inode_cache, "inode_cache"}, |
3818aea2 | 375 | {Opt_noinode_cache, "noinode_cache"}, |
8965593e | 376 | {Opt_no_space_cache, "nospace_cache"}, |
8dcddfa0 QW |
377 | {Opt_recovery, "recovery"}, /* deprecated */ |
378 | {Opt_usebackuproot, "usebackuproot"}, | |
9555c6c1 | 379 | {Opt_skip_balance, "skip_balance"}, |
21adbd5c SB |
380 | {Opt_check_integrity, "check_int"}, |
381 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
382 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, | |
f420ee1e | 383 | {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, |
8c342930 | 384 | {Opt_fatal_errors, "fatal_errors=%s"}, |
8b87dc17 | 385 | {Opt_commit_interval, "commit=%d"}, |
d0bd4560 JB |
386 | #ifdef CONFIG_BTRFS_DEBUG |
387 | {Opt_fragment_data, "fragment=data"}, | |
388 | {Opt_fragment_metadata, "fragment=metadata"}, | |
389 | {Opt_fragment_all, "fragment=all"}, | |
390 | #endif | |
33268eaf | 391 | {Opt_err, NULL}, |
95e05289 CM |
392 | }; |
393 | ||
edf24abe CH |
394 | /* |
395 | * Regular mount options parser. Everything that is needed only when | |
396 | * reading in a new superblock is parsed here. | |
49b25e05 | 397 | * XXX JDM: This needs to be cleaned up for remount. |
edf24abe | 398 | */ |
2ff7e61e | 399 | int btrfs_parse_options(struct btrfs_fs_info *info, char *options, |
96da0919 | 400 | unsigned long new_flags) |
95e05289 | 401 | { |
95e05289 | 402 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
403 | char *p, *num, *orig = NULL; |
404 | u64 cache_gen; | |
4543df7e | 405 | int intarg; |
a7a3f7ca | 406 | int ret = 0; |
261507a0 LZ |
407 | char *compress_type; |
408 | bool compress_force = false; | |
b7c47bbb TI |
409 | enum btrfs_compression_type saved_compress_type; |
410 | bool saved_compress_force; | |
411 | int no_compress = 0; | |
b6cda9bc | 412 | |
0b246afa JM |
413 | cache_gen = btrfs_super_cache_generation(info->super_copy); |
414 | if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) | |
70f6d82e OS |
415 | btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); |
416 | else if (cache_gen) | |
73bc1876 JB |
417 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
418 | ||
96da0919 QW |
419 | /* |
420 | * Even the options are empty, we still need to do extra check | |
421 | * against new flags | |
422 | */ | |
95e05289 | 423 | if (!options) |
96da0919 | 424 | goto check; |
95e05289 | 425 | |
be20aa9d CM |
426 | /* |
427 | * strsep changes the string, duplicate it because parse_options | |
428 | * gets called twice | |
429 | */ | |
430 | options = kstrdup(options, GFP_NOFS); | |
431 | if (!options) | |
432 | return -ENOMEM; | |
433 | ||
da495ecc | 434 | orig = options; |
be20aa9d | 435 | |
edf24abe | 436 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
437 | int token; |
438 | if (!*p) | |
439 | continue; | |
440 | ||
441 | token = match_token(p, tokens, args); | |
442 | switch (token) { | |
dfe25020 | 443 | case Opt_degraded: |
0b246afa | 444 | btrfs_info(info, "allowing degraded mounts"); |
edf24abe | 445 | btrfs_set_opt(info->mount_opt, DEGRADED); |
dfe25020 | 446 | break; |
95e05289 | 447 | case Opt_subvol: |
73f73415 | 448 | case Opt_subvolid: |
e15d0542 | 449 | case Opt_subvolrootid: |
43e570b0 | 450 | case Opt_device: |
edf24abe | 451 | /* |
43e570b0 | 452 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
453 | * and can be happily ignored here. |
454 | */ | |
b6cda9bc CM |
455 | break; |
456 | case Opt_nodatasum: | |
3cdde224 | 457 | btrfs_set_and_info(info, NODATASUM, |
07802534 | 458 | "setting nodatasum"); |
be20aa9d | 459 | break; |
d399167d | 460 | case Opt_datasum: |
3cdde224 JM |
461 | if (btrfs_test_opt(info, NODATASUM)) { |
462 | if (btrfs_test_opt(info, NODATACOW)) | |
0b246afa | 463 | btrfs_info(info, |
5d163e0e | 464 | "setting datasum, datacow enabled"); |
07802534 | 465 | else |
0b246afa | 466 | btrfs_info(info, "setting datasum"); |
07802534 | 467 | } |
d399167d QW |
468 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
469 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
470 | break; | |
be20aa9d | 471 | case Opt_nodatacow: |
3cdde224 JM |
472 | if (!btrfs_test_opt(info, NODATACOW)) { |
473 | if (!btrfs_test_opt(info, COMPRESS) || | |
474 | !btrfs_test_opt(info, FORCE_COMPRESS)) { | |
0b246afa | 475 | btrfs_info(info, |
07802534 QW |
476 | "setting nodatacow, compression disabled"); |
477 | } else { | |
0b246afa | 478 | btrfs_info(info, "setting nodatacow"); |
07802534 | 479 | } |
bedb2cca | 480 | } |
bedb2cca AP |
481 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
482 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
edf24abe CH |
483 | btrfs_set_opt(info->mount_opt, NODATACOW); |
484 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 485 | break; |
a258af7a | 486 | case Opt_datacow: |
3cdde224 | 487 | btrfs_clear_and_info(info, NODATACOW, |
07802534 | 488 | "setting datacow"); |
a258af7a | 489 | break; |
a555f810 | 490 | case Opt_compress_force: |
261507a0 LZ |
491 | case Opt_compress_force_type: |
492 | compress_force = true; | |
1c697d4a | 493 | /* Fallthrough */ |
261507a0 LZ |
494 | case Opt_compress: |
495 | case Opt_compress_type: | |
3cdde224 JM |
496 | saved_compress_type = btrfs_test_opt(info, |
497 | COMPRESS) ? | |
b7c47bbb TI |
498 | info->compress_type : BTRFS_COMPRESS_NONE; |
499 | saved_compress_force = | |
3cdde224 | 500 | btrfs_test_opt(info, FORCE_COMPRESS); |
261507a0 LZ |
501 | if (token == Opt_compress || |
502 | token == Opt_compress_force || | |
503 | strcmp(args[0].from, "zlib") == 0) { | |
504 | compress_type = "zlib"; | |
505 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
063849ea | 506 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
507 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
508 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
b7c47bbb | 509 | no_compress = 0; |
a6fa6fae LZ |
510 | } else if (strcmp(args[0].from, "lzo") == 0) { |
511 | compress_type = "lzo"; | |
512 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 513 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
514 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
515 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
2b0ce2c2 | 516 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
b7c47bbb | 517 | no_compress = 0; |
063849ea AH |
518 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
519 | compress_type = "no"; | |
063849ea AH |
520 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
521 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
522 | compress_force = false; | |
b7c47bbb | 523 | no_compress++; |
261507a0 LZ |
524 | } else { |
525 | ret = -EINVAL; | |
526 | goto out; | |
527 | } | |
528 | ||
261507a0 | 529 | if (compress_force) { |
b7c47bbb | 530 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); |
143f3636 | 531 | } else { |
4027e0f4 WS |
532 | /* |
533 | * If we remount from compress-force=xxx to | |
534 | * compress=xxx, we need clear FORCE_COMPRESS | |
535 | * flag, otherwise, there is no way for users | |
536 | * to disable forcible compression separately. | |
537 | */ | |
538 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
a7e252af | 539 | } |
3cdde224 | 540 | if ((btrfs_test_opt(info, COMPRESS) && |
b7c47bbb TI |
541 | (info->compress_type != saved_compress_type || |
542 | compress_force != saved_compress_force)) || | |
3cdde224 | 543 | (!btrfs_test_opt(info, COMPRESS) && |
b7c47bbb | 544 | no_compress == 1)) { |
0b246afa | 545 | btrfs_info(info, "%s %s compression", |
b7c47bbb TI |
546 | (compress_force) ? "force" : "use", |
547 | compress_type); | |
548 | } | |
549 | compress_force = false; | |
a555f810 | 550 | break; |
e18e4809 | 551 | case Opt_ssd: |
3cdde224 | 552 | btrfs_set_and_info(info, SSD, |
07802534 | 553 | "use ssd allocation scheme"); |
e18e4809 | 554 | break; |
451d7585 | 555 | case Opt_ssd_spread: |
3cdde224 | 556 | btrfs_set_and_info(info, SSD_SPREAD, |
07802534 | 557 | "use spread ssd allocation scheme"); |
2aa06a35 | 558 | btrfs_set_opt(info->mount_opt, SSD); |
451d7585 | 559 | break; |
3b30c22f | 560 | case Opt_nossd: |
3cdde224 | 561 | btrfs_set_and_info(info, NOSSD, |
07802534 | 562 | "not using ssd allocation scheme"); |
3b30c22f CM |
563 | btrfs_clear_opt(info->mount_opt, SSD); |
564 | break; | |
842bef58 | 565 | case Opt_barrier: |
3cdde224 | 566 | btrfs_clear_and_info(info, NOBARRIER, |
07802534 | 567 | "turning on barriers"); |
842bef58 | 568 | break; |
21ad10cf | 569 | case Opt_nobarrier: |
3cdde224 | 570 | btrfs_set_and_info(info, NOBARRIER, |
07802534 | 571 | "turning off barriers"); |
21ad10cf | 572 | break; |
4543df7e | 573 | case Opt_thread_pool: |
2c334e87 WS |
574 | ret = match_int(&args[0], &intarg); |
575 | if (ret) { | |
576 | goto out; | |
577 | } else if (intarg > 0) { | |
4543df7e | 578 | info->thread_pool_size = intarg; |
2c334e87 WS |
579 | } else { |
580 | ret = -EINVAL; | |
581 | goto out; | |
582 | } | |
4543df7e | 583 | break; |
6f568d35 | 584 | case Opt_max_inline: |
edf24abe CH |
585 | num = match_strdup(&args[0]); |
586 | if (num) { | |
91748467 | 587 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
588 | kfree(num); |
589 | ||
15ada040 | 590 | if (info->max_inline) { |
feb5f965 | 591 | info->max_inline = min_t(u64, |
15ada040 | 592 | info->max_inline, |
0b246afa | 593 | info->sectorsize); |
15ada040 | 594 | } |
0b246afa JM |
595 | btrfs_info(info, "max_inline at %llu", |
596 | info->max_inline); | |
2c334e87 WS |
597 | } else { |
598 | ret = -ENOMEM; | |
599 | goto out; | |
6f568d35 CM |
600 | } |
601 | break; | |
8f662a76 | 602 | case Opt_alloc_start: |
edf24abe CH |
603 | num = match_strdup(&args[0]); |
604 | if (num) { | |
c018daec | 605 | mutex_lock(&info->chunk_mutex); |
91748467 | 606 | info->alloc_start = memparse(num, NULL); |
c018daec | 607 | mutex_unlock(&info->chunk_mutex); |
edf24abe | 608 | kfree(num); |
0b246afa | 609 | btrfs_info(info, "allocations start at %llu", |
5d163e0e | 610 | info->alloc_start); |
2c334e87 WS |
611 | } else { |
612 | ret = -ENOMEM; | |
613 | goto out; | |
8f662a76 CM |
614 | } |
615 | break; | |
bd0330ad | 616 | case Opt_acl: |
45ff35d6 | 617 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
0b246afa | 618 | info->sb->s_flags |= MS_POSIXACL; |
bd0330ad | 619 | break; |
45ff35d6 | 620 | #else |
0b246afa | 621 | btrfs_err(info, "support for ACL not compiled in!"); |
45ff35d6 GZ |
622 | ret = -EINVAL; |
623 | goto out; | |
624 | #endif | |
33268eaf | 625 | case Opt_noacl: |
0b246afa | 626 | info->sb->s_flags &= ~MS_POSIXACL; |
33268eaf | 627 | break; |
3a5e1404 | 628 | case Opt_notreelog: |
3cdde224 | 629 | btrfs_set_and_info(info, NOTREELOG, |
07802534 | 630 | "disabling tree log"); |
a88998f2 QW |
631 | break; |
632 | case Opt_treelog: | |
3cdde224 | 633 | btrfs_clear_and_info(info, NOTREELOG, |
07802534 | 634 | "enabling tree log"); |
3a5e1404 | 635 | break; |
fed8f166 | 636 | case Opt_norecovery: |
96da0919 | 637 | case Opt_nologreplay: |
3cdde224 | 638 | btrfs_set_and_info(info, NOLOGREPLAY, |
96da0919 QW |
639 | "disabling log replay at mount time"); |
640 | break; | |
dccae999 | 641 | case Opt_flushoncommit: |
3cdde224 | 642 | btrfs_set_and_info(info, FLUSHONCOMMIT, |
07802534 | 643 | "turning on flush-on-commit"); |
dccae999 | 644 | break; |
2c9ee856 | 645 | case Opt_noflushoncommit: |
3cdde224 | 646 | btrfs_clear_and_info(info, FLUSHONCOMMIT, |
07802534 | 647 | "turning off flush-on-commit"); |
2c9ee856 | 648 | break; |
97e728d4 | 649 | case Opt_ratio: |
2c334e87 WS |
650 | ret = match_int(&args[0], &intarg); |
651 | if (ret) { | |
652 | goto out; | |
653 | } else if (intarg >= 0) { | |
97e728d4 | 654 | info->metadata_ratio = intarg; |
0b246afa JM |
655 | btrfs_info(info, "metadata ratio %d", |
656 | info->metadata_ratio); | |
2c334e87 WS |
657 | } else { |
658 | ret = -EINVAL; | |
659 | goto out; | |
97e728d4 JB |
660 | } |
661 | break; | |
e244a0ae | 662 | case Opt_discard: |
3cdde224 | 663 | btrfs_set_and_info(info, DISCARD, |
07802534 | 664 | "turning on discard"); |
e244a0ae | 665 | break; |
e07a2ade | 666 | case Opt_nodiscard: |
3cdde224 | 667 | btrfs_clear_and_info(info, DISCARD, |
07802534 | 668 | "turning off discard"); |
e07a2ade | 669 | break; |
0af3d00b | 670 | case Opt_space_cache: |
70f6d82e OS |
671 | case Opt_space_cache_version: |
672 | if (token == Opt_space_cache || | |
673 | strcmp(args[0].from, "v1") == 0) { | |
0b246afa | 674 | btrfs_clear_opt(info->mount_opt, |
70f6d82e | 675 | FREE_SPACE_TREE); |
3cdde224 | 676 | btrfs_set_and_info(info, SPACE_CACHE, |
0b246afa | 677 | "enabling disk space caching"); |
70f6d82e | 678 | } else if (strcmp(args[0].from, "v2") == 0) { |
0b246afa | 679 | btrfs_clear_opt(info->mount_opt, |
70f6d82e | 680 | SPACE_CACHE); |
0b246afa | 681 | btrfs_set_and_info(info, FREE_SPACE_TREE, |
70f6d82e OS |
682 | "enabling free space tree"); |
683 | } else { | |
684 | ret = -EINVAL; | |
685 | goto out; | |
686 | } | |
0de90876 | 687 | break; |
f420ee1e SB |
688 | case Opt_rescan_uuid_tree: |
689 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); | |
690 | break; | |
73bc1876 | 691 | case Opt_no_space_cache: |
3cdde224 | 692 | if (btrfs_test_opt(info, SPACE_CACHE)) { |
0b246afa JM |
693 | btrfs_clear_and_info(info, SPACE_CACHE, |
694 | "disabling disk space caching"); | |
70f6d82e | 695 | } |
3cdde224 | 696 | if (btrfs_test_opt(info, FREE_SPACE_TREE)) { |
0b246afa JM |
697 | btrfs_clear_and_info(info, FREE_SPACE_TREE, |
698 | "disabling free space tree"); | |
70f6d82e | 699 | } |
73bc1876 | 700 | break; |
4b9465cb | 701 | case Opt_inode_cache: |
7e1876ac | 702 | btrfs_set_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 703 | "enabling inode map caching"); |
3818aea2 QW |
704 | break; |
705 | case Opt_noinode_cache: | |
7e1876ac | 706 | btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 707 | "disabling inode map caching"); |
4b9465cb | 708 | break; |
88c2ba3b | 709 | case Opt_clear_cache: |
3cdde224 | 710 | btrfs_set_and_info(info, CLEAR_CACHE, |
07802534 | 711 | "force clearing of disk cache"); |
0af3d00b | 712 | break; |
4260f7c7 SW |
713 | case Opt_user_subvol_rm_allowed: |
714 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
715 | break; | |
91435650 CM |
716 | case Opt_enospc_debug: |
717 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
718 | break; | |
53036293 QW |
719 | case Opt_noenospc_debug: |
720 | btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); | |
721 | break; | |
4cb5300b | 722 | case Opt_defrag: |
3cdde224 | 723 | btrfs_set_and_info(info, AUTO_DEFRAG, |
07802534 | 724 | "enabling auto defrag"); |
4cb5300b | 725 | break; |
fc0ca9af | 726 | case Opt_nodefrag: |
3cdde224 | 727 | btrfs_clear_and_info(info, AUTO_DEFRAG, |
07802534 | 728 | "disabling auto defrag"); |
fc0ca9af | 729 | break; |
af31f5e5 | 730 | case Opt_recovery: |
0b246afa | 731 | btrfs_warn(info, |
8dcddfa0 QW |
732 | "'recovery' is deprecated, use 'usebackuproot' instead"); |
733 | case Opt_usebackuproot: | |
0b246afa | 734 | btrfs_info(info, |
8dcddfa0 QW |
735 | "trying to use backup root at mount time"); |
736 | btrfs_set_opt(info->mount_opt, USEBACKUPROOT); | |
af31f5e5 | 737 | break; |
9555c6c1 ID |
738 | case Opt_skip_balance: |
739 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
740 | break; | |
21adbd5c SB |
741 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
742 | case Opt_check_integrity_including_extent_data: | |
0b246afa | 743 | btrfs_info(info, |
efe120a0 | 744 | "enabling check integrity including extent data"); |
21adbd5c SB |
745 | btrfs_set_opt(info->mount_opt, |
746 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
747 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
748 | break; | |
749 | case Opt_check_integrity: | |
0b246afa | 750 | btrfs_info(info, "enabling check integrity"); |
21adbd5c SB |
751 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
752 | break; | |
753 | case Opt_check_integrity_print_mask: | |
2c334e87 WS |
754 | ret = match_int(&args[0], &intarg); |
755 | if (ret) { | |
756 | goto out; | |
757 | } else if (intarg >= 0) { | |
21adbd5c | 758 | info->check_integrity_print_mask = intarg; |
0b246afa | 759 | btrfs_info(info, |
5d163e0e JM |
760 | "check_integrity_print_mask 0x%x", |
761 | info->check_integrity_print_mask); | |
2c334e87 WS |
762 | } else { |
763 | ret = -EINVAL; | |
764 | goto out; | |
21adbd5c SB |
765 | } |
766 | break; | |
767 | #else | |
768 | case Opt_check_integrity_including_extent_data: | |
769 | case Opt_check_integrity: | |
770 | case Opt_check_integrity_print_mask: | |
0b246afa JM |
771 | btrfs_err(info, |
772 | "support for check_integrity* not compiled in!"); | |
21adbd5c SB |
773 | ret = -EINVAL; |
774 | goto out; | |
775 | #endif | |
8c342930 JM |
776 | case Opt_fatal_errors: |
777 | if (strcmp(args[0].from, "panic") == 0) | |
778 | btrfs_set_opt(info->mount_opt, | |
779 | PANIC_ON_FATAL_ERROR); | |
780 | else if (strcmp(args[0].from, "bug") == 0) | |
781 | btrfs_clear_opt(info->mount_opt, | |
782 | PANIC_ON_FATAL_ERROR); | |
783 | else { | |
784 | ret = -EINVAL; | |
785 | goto out; | |
786 | } | |
787 | break; | |
8b87dc17 DS |
788 | case Opt_commit_interval: |
789 | intarg = 0; | |
790 | ret = match_int(&args[0], &intarg); | |
791 | if (ret < 0) { | |
0b246afa | 792 | btrfs_err(info, "invalid commit interval"); |
8b87dc17 DS |
793 | ret = -EINVAL; |
794 | goto out; | |
795 | } | |
796 | if (intarg > 0) { | |
797 | if (intarg > 300) { | |
0b246afa | 798 | btrfs_warn(info, |
5d163e0e JM |
799 | "excessive commit interval %d", |
800 | intarg); | |
8b87dc17 DS |
801 | } |
802 | info->commit_interval = intarg; | |
803 | } else { | |
0b246afa | 804 | btrfs_info(info, |
5d163e0e JM |
805 | "using default commit interval %ds", |
806 | BTRFS_DEFAULT_COMMIT_INTERVAL); | |
8b87dc17 DS |
807 | info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; |
808 | } | |
809 | break; | |
d0bd4560 JB |
810 | #ifdef CONFIG_BTRFS_DEBUG |
811 | case Opt_fragment_all: | |
0b246afa | 812 | btrfs_info(info, "fragmenting all space"); |
d0bd4560 JB |
813 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); |
814 | btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); | |
815 | break; | |
816 | case Opt_fragment_metadata: | |
0b246afa | 817 | btrfs_info(info, "fragmenting metadata"); |
d0bd4560 JB |
818 | btrfs_set_opt(info->mount_opt, |
819 | FRAGMENT_METADATA); | |
820 | break; | |
821 | case Opt_fragment_data: | |
0b246afa | 822 | btrfs_info(info, "fragmenting data"); |
d0bd4560 JB |
823 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); |
824 | break; | |
825 | #endif | |
a7a3f7ca | 826 | case Opt_err: |
0b246afa | 827 | btrfs_info(info, "unrecognized mount option '%s'", p); |
a7a3f7ca SW |
828 | ret = -EINVAL; |
829 | goto out; | |
95e05289 | 830 | default: |
be20aa9d | 831 | break; |
95e05289 CM |
832 | } |
833 | } | |
96da0919 QW |
834 | check: |
835 | /* | |
836 | * Extra check for current option against current flag | |
837 | */ | |
3cdde224 | 838 | if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & MS_RDONLY)) { |
0b246afa | 839 | btrfs_err(info, |
96da0919 QW |
840 | "nologreplay must be used with ro mount option"); |
841 | ret = -EINVAL; | |
842 | } | |
a7a3f7ca | 843 | out: |
0b246afa | 844 | if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && |
3cdde224 JM |
845 | !btrfs_test_opt(info, FREE_SPACE_TREE) && |
846 | !btrfs_test_opt(info, CLEAR_CACHE)) { | |
0b246afa | 847 | btrfs_err(info, "cannot disable free space tree"); |
70f6d82e OS |
848 | ret = -EINVAL; |
849 | ||
850 | } | |
3cdde224 | 851 | if (!ret && btrfs_test_opt(info, SPACE_CACHE)) |
0b246afa | 852 | btrfs_info(info, "disk space caching is enabled"); |
3cdde224 | 853 | if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) |
0b246afa | 854 | btrfs_info(info, "using free space tree"); |
da495ecc | 855 | kfree(orig); |
a7a3f7ca | 856 | return ret; |
edf24abe CH |
857 | } |
858 | ||
859 | /* | |
860 | * Parse mount options that are required early in the mount process. | |
861 | * | |
862 | * All other options will be parsed on much later in the mount process and | |
863 | * only when we need to allocate a new super block. | |
864 | */ | |
97288f2c | 865 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 866 | void *holder, char **subvol_name, u64 *subvol_objectid, |
5e2a4b25 | 867 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
868 | { |
869 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 870 | char *device_name, *opts, *orig, *p; |
1493381f | 871 | char *num = NULL; |
edf24abe CH |
872 | int error = 0; |
873 | ||
874 | if (!options) | |
830c4adb | 875 | return 0; |
edf24abe CH |
876 | |
877 | /* | |
878 | * strsep changes the string, duplicate it because parse_options | |
879 | * gets called twice | |
880 | */ | |
881 | opts = kstrdup(options, GFP_KERNEL); | |
882 | if (!opts) | |
883 | return -ENOMEM; | |
3f3d0bc0 | 884 | orig = opts; |
edf24abe CH |
885 | |
886 | while ((p = strsep(&opts, ",")) != NULL) { | |
887 | int token; | |
888 | if (!*p) | |
889 | continue; | |
890 | ||
891 | token = match_token(p, tokens, args); | |
892 | switch (token) { | |
893 | case Opt_subvol: | |
a90e8b6f | 894 | kfree(*subvol_name); |
edf24abe | 895 | *subvol_name = match_strdup(&args[0]); |
2c334e87 WS |
896 | if (!*subvol_name) { |
897 | error = -ENOMEM; | |
898 | goto out; | |
899 | } | |
edf24abe | 900 | break; |
73f73415 | 901 | case Opt_subvolid: |
1493381f WS |
902 | num = match_strdup(&args[0]); |
903 | if (num) { | |
904 | *subvol_objectid = memparse(num, NULL); | |
905 | kfree(num); | |
4849f01d | 906 | /* we want the original fs_tree */ |
1493381f | 907 | if (!*subvol_objectid) |
4849f01d JB |
908 | *subvol_objectid = |
909 | BTRFS_FS_TREE_OBJECTID; | |
2c334e87 WS |
910 | } else { |
911 | error = -EINVAL; | |
912 | goto out; | |
4849f01d | 913 | } |
73f73415 | 914 | break; |
e15d0542 | 915 | case Opt_subvolrootid: |
62e85577 | 916 | pr_warn("BTRFS: 'subvolrootid' mount option is deprecated and has no effect\n"); |
e15d0542 | 917 | break; |
43e570b0 | 918 | case Opt_device: |
83c8c9bd JL |
919 | device_name = match_strdup(&args[0]); |
920 | if (!device_name) { | |
921 | error = -ENOMEM; | |
922 | goto out; | |
923 | } | |
924 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 925 | flags, holder, fs_devices); |
83c8c9bd | 926 | kfree(device_name); |
43e570b0 | 927 | if (error) |
830c4adb | 928 | goto out; |
43e570b0 | 929 | break; |
edf24abe CH |
930 | default: |
931 | break; | |
932 | } | |
933 | } | |
934 | ||
830c4adb | 935 | out: |
3f3d0bc0 | 936 | kfree(orig); |
edf24abe | 937 | return error; |
95e05289 CM |
938 | } |
939 | ||
05dbe683 OS |
940 | static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, |
941 | u64 subvol_objectid) | |
73f73415 | 942 | { |
815745cf | 943 | struct btrfs_root *root = fs_info->tree_root; |
05dbe683 OS |
944 | struct btrfs_root *fs_root; |
945 | struct btrfs_root_ref *root_ref; | |
946 | struct btrfs_inode_ref *inode_ref; | |
947 | struct btrfs_key key; | |
948 | struct btrfs_path *path = NULL; | |
949 | char *name = NULL, *ptr; | |
950 | u64 dirid; | |
951 | int len; | |
952 | int ret; | |
953 | ||
954 | path = btrfs_alloc_path(); | |
955 | if (!path) { | |
956 | ret = -ENOMEM; | |
957 | goto err; | |
958 | } | |
959 | path->leave_spinning = 1; | |
960 | ||
961 | name = kmalloc(PATH_MAX, GFP_NOFS); | |
962 | if (!name) { | |
963 | ret = -ENOMEM; | |
964 | goto err; | |
965 | } | |
966 | ptr = name + PATH_MAX - 1; | |
967 | ptr[0] = '\0'; | |
73f73415 JB |
968 | |
969 | /* | |
05dbe683 OS |
970 | * Walk up the subvolume trees in the tree of tree roots by root |
971 | * backrefs until we hit the top-level subvolume. | |
73f73415 | 972 | */ |
05dbe683 OS |
973 | while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
974 | key.objectid = subvol_objectid; | |
975 | key.type = BTRFS_ROOT_BACKREF_KEY; | |
976 | key.offset = (u64)-1; | |
977 | ||
978 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
979 | if (ret < 0) { | |
980 | goto err; | |
981 | } else if (ret > 0) { | |
982 | ret = btrfs_previous_item(root, path, subvol_objectid, | |
983 | BTRFS_ROOT_BACKREF_KEY); | |
984 | if (ret < 0) { | |
985 | goto err; | |
986 | } else if (ret > 0) { | |
987 | ret = -ENOENT; | |
988 | goto err; | |
989 | } | |
990 | } | |
991 | ||
992 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
993 | subvol_objectid = key.offset; | |
994 | ||
995 | root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
996 | struct btrfs_root_ref); | |
997 | len = btrfs_root_ref_name_len(path->nodes[0], root_ref); | |
998 | ptr -= len + 1; | |
999 | if (ptr < name) { | |
1000 | ret = -ENAMETOOLONG; | |
1001 | goto err; | |
1002 | } | |
1003 | read_extent_buffer(path->nodes[0], ptr + 1, | |
1004 | (unsigned long)(root_ref + 1), len); | |
1005 | ptr[0] = '/'; | |
1006 | dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); | |
1007 | btrfs_release_path(path); | |
1008 | ||
1009 | key.objectid = subvol_objectid; | |
1010 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1011 | key.offset = (u64)-1; | |
1012 | fs_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
1013 | if (IS_ERR(fs_root)) { | |
1014 | ret = PTR_ERR(fs_root); | |
1015 | goto err; | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * Walk up the filesystem tree by inode refs until we hit the | |
1020 | * root directory. | |
1021 | */ | |
1022 | while (dirid != BTRFS_FIRST_FREE_OBJECTID) { | |
1023 | key.objectid = dirid; | |
1024 | key.type = BTRFS_INODE_REF_KEY; | |
1025 | key.offset = (u64)-1; | |
1026 | ||
1027 | ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); | |
1028 | if (ret < 0) { | |
1029 | goto err; | |
1030 | } else if (ret > 0) { | |
1031 | ret = btrfs_previous_item(fs_root, path, dirid, | |
1032 | BTRFS_INODE_REF_KEY); | |
1033 | if (ret < 0) { | |
1034 | goto err; | |
1035 | } else if (ret > 0) { | |
1036 | ret = -ENOENT; | |
1037 | goto err; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1042 | dirid = key.offset; | |
1043 | ||
1044 | inode_ref = btrfs_item_ptr(path->nodes[0], | |
1045 | path->slots[0], | |
1046 | struct btrfs_inode_ref); | |
1047 | len = btrfs_inode_ref_name_len(path->nodes[0], | |
1048 | inode_ref); | |
1049 | ptr -= len + 1; | |
1050 | if (ptr < name) { | |
1051 | ret = -ENAMETOOLONG; | |
1052 | goto err; | |
1053 | } | |
1054 | read_extent_buffer(path->nodes[0], ptr + 1, | |
1055 | (unsigned long)(inode_ref + 1), len); | |
1056 | ptr[0] = '/'; | |
1057 | btrfs_release_path(path); | |
1058 | } | |
73f73415 JB |
1059 | } |
1060 | ||
05dbe683 OS |
1061 | btrfs_free_path(path); |
1062 | if (ptr == name + PATH_MAX - 1) { | |
1063 | name[0] = '/'; | |
1064 | name[1] = '\0'; | |
1065 | } else { | |
1066 | memmove(name, ptr, name + PATH_MAX - ptr); | |
1067 | } | |
1068 | return name; | |
1069 | ||
1070 | err: | |
1071 | btrfs_free_path(path); | |
1072 | kfree(name); | |
1073 | return ERR_PTR(ret); | |
1074 | } | |
1075 | ||
1076 | static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) | |
1077 | { | |
1078 | struct btrfs_root *root = fs_info->tree_root; | |
1079 | struct btrfs_dir_item *di; | |
1080 | struct btrfs_path *path; | |
1081 | struct btrfs_key location; | |
1082 | u64 dir_id; | |
1083 | ||
73f73415 JB |
1084 | path = btrfs_alloc_path(); |
1085 | if (!path) | |
05dbe683 | 1086 | return -ENOMEM; |
73f73415 JB |
1087 | path->leave_spinning = 1; |
1088 | ||
1089 | /* | |
1090 | * Find the "default" dir item which points to the root item that we | |
1091 | * will mount by default if we haven't been given a specific subvolume | |
1092 | * to mount. | |
1093 | */ | |
815745cf | 1094 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 1095 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
1096 | if (IS_ERR(di)) { |
1097 | btrfs_free_path(path); | |
05dbe683 | 1098 | return PTR_ERR(di); |
b0839166 | 1099 | } |
73f73415 JB |
1100 | if (!di) { |
1101 | /* | |
1102 | * Ok the default dir item isn't there. This is weird since | |
1103 | * it's always been there, but don't freak out, just try and | |
05dbe683 | 1104 | * mount the top-level subvolume. |
73f73415 JB |
1105 | */ |
1106 | btrfs_free_path(path); | |
05dbe683 OS |
1107 | *objectid = BTRFS_FS_TREE_OBJECTID; |
1108 | return 0; | |
73f73415 JB |
1109 | } |
1110 | ||
1111 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
1112 | btrfs_free_path(path); | |
05dbe683 OS |
1113 | *objectid = location.objectid; |
1114 | return 0; | |
73f73415 JB |
1115 | } |
1116 | ||
d397712b | 1117 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 1118 | struct btrfs_fs_devices *fs_devices, |
d397712b | 1119 | void *data, int silent) |
75dfe396 | 1120 | { |
d397712b | 1121 | struct inode *inode; |
815745cf | 1122 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 1123 | struct btrfs_key key; |
39279cc3 | 1124 | int err; |
a429e513 | 1125 | |
39279cc3 CM |
1126 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
1127 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
1128 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 1129 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 1130 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 1131 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 1132 | sb->s_time_gran = 1; |
0eda294d | 1133 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 1134 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 1135 | #endif |
0c4d2d95 | 1136 | sb->s_flags |= MS_I_VERSION; |
da2f0f74 | 1137 | sb->s_iflags |= SB_I_CGROUPWB; |
ad2b2c80 AV |
1138 | err = open_ctree(sb, fs_devices, (char *)data); |
1139 | if (err) { | |
ab8d0fc4 | 1140 | btrfs_err(fs_info, "open_ctree failed"); |
ad2b2c80 | 1141 | return err; |
a429e513 CM |
1142 | } |
1143 | ||
5d4f98a2 YZ |
1144 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
1145 | key.type = BTRFS_INODE_ITEM_KEY; | |
1146 | key.offset = 0; | |
98c7089c | 1147 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
1148 | if (IS_ERR(inode)) { |
1149 | err = PTR_ERR(inode); | |
39279cc3 | 1150 | goto fail_close; |
f254e52c | 1151 | } |
f254e52c | 1152 | |
48fde701 AV |
1153 | sb->s_root = d_make_root(inode); |
1154 | if (!sb->s_root) { | |
39279cc3 CM |
1155 | err = -ENOMEM; |
1156 | goto fail_close; | |
f254e52c | 1157 | } |
58176a96 | 1158 | |
6885f308 | 1159 | save_mount_options(sb, data); |
90a887c9 | 1160 | cleancache_init_fs(sb); |
59553edf | 1161 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 1162 | return 0; |
39279cc3 CM |
1163 | |
1164 | fail_close: | |
6bccf3ab | 1165 | close_ctree(fs_info); |
39279cc3 | 1166 | return err; |
2619ba1f CM |
1167 | } |
1168 | ||
6bf13c0c | 1169 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
1170 | { |
1171 | struct btrfs_trans_handle *trans; | |
815745cf AV |
1172 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1173 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 1174 | |
bc074524 | 1175 | trace_btrfs_sync_fs(fs_info, wait); |
1abe9b8a | 1176 | |
39279cc3 | 1177 | if (!wait) { |
815745cf | 1178 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
1179 | return 0; |
1180 | } | |
771ed689 | 1181 | |
578def7c | 1182 | btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); |
771ed689 | 1183 | |
d4edf39b | 1184 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 1185 | if (IS_ERR(trans)) { |
354aa0fb | 1186 | /* no transaction, don't bother */ |
6b5fe46d DS |
1187 | if (PTR_ERR(trans) == -ENOENT) { |
1188 | /* | |
1189 | * Exit unless we have some pending changes | |
1190 | * that need to go through commit | |
1191 | */ | |
1192 | if (fs_info->pending_changes == 0) | |
1193 | return 0; | |
a53f4f8e QW |
1194 | /* |
1195 | * A non-blocking test if the fs is frozen. We must not | |
1196 | * start a new transaction here otherwise a deadlock | |
1197 | * happens. The pending operations are delayed to the | |
1198 | * next commit after thawing. | |
1199 | */ | |
1200 | if (__sb_start_write(sb, SB_FREEZE_WRITE, false)) | |
1201 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1202 | else | |
1203 | return 0; | |
6b5fe46d | 1204 | trans = btrfs_start_transaction(root, 0); |
6b5fe46d | 1205 | } |
98bd5c54 DS |
1206 | if (IS_ERR(trans)) |
1207 | return PTR_ERR(trans); | |
60376ce4 | 1208 | } |
3a45bb20 | 1209 | return btrfs_commit_transaction(trans); |
2c90e5d6 CM |
1210 | } |
1211 | ||
34c80b1d | 1212 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 1213 | { |
815745cf | 1214 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
200da64e | 1215 | char *compress_type; |
a9572a15 | 1216 | |
3cdde224 | 1217 | if (btrfs_test_opt(info, DEGRADED)) |
a9572a15 | 1218 | seq_puts(seq, ",degraded"); |
3cdde224 | 1219 | if (btrfs_test_opt(info, NODATASUM)) |
a9572a15 | 1220 | seq_puts(seq, ",nodatasum"); |
3cdde224 | 1221 | if (btrfs_test_opt(info, NODATACOW)) |
a9572a15 | 1222 | seq_puts(seq, ",nodatacow"); |
3cdde224 | 1223 | if (btrfs_test_opt(info, NOBARRIER)) |
a9572a15 | 1224 | seq_puts(seq, ",nobarrier"); |
95ac567a | 1225 | if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) |
c1c9ff7c | 1226 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
a9572a15 | 1227 | if (info->alloc_start != 0) |
c1c9ff7c | 1228 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); |
a9572a15 EP |
1229 | if (info->thread_pool_size != min_t(unsigned long, |
1230 | num_online_cpus() + 2, 8)) | |
1231 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
3cdde224 | 1232 | if (btrfs_test_opt(info, COMPRESS)) { |
200da64e TI |
1233 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) |
1234 | compress_type = "zlib"; | |
1235 | else | |
1236 | compress_type = "lzo"; | |
3cdde224 | 1237 | if (btrfs_test_opt(info, FORCE_COMPRESS)) |
200da64e TI |
1238 | seq_printf(seq, ",compress-force=%s", compress_type); |
1239 | else | |
1240 | seq_printf(seq, ",compress=%s", compress_type); | |
1241 | } | |
3cdde224 | 1242 | if (btrfs_test_opt(info, NOSSD)) |
c289811c | 1243 | seq_puts(seq, ",nossd"); |
3cdde224 | 1244 | if (btrfs_test_opt(info, SSD_SPREAD)) |
451d7585 | 1245 | seq_puts(seq, ",ssd_spread"); |
3cdde224 | 1246 | else if (btrfs_test_opt(info, SSD)) |
a9572a15 | 1247 | seq_puts(seq, ",ssd"); |
3cdde224 | 1248 | if (btrfs_test_opt(info, NOTREELOG)) |
6b65c5c6 | 1249 | seq_puts(seq, ",notreelog"); |
3cdde224 | 1250 | if (btrfs_test_opt(info, NOLOGREPLAY)) |
96da0919 | 1251 | seq_puts(seq, ",nologreplay"); |
3cdde224 | 1252 | if (btrfs_test_opt(info, FLUSHONCOMMIT)) |
6b65c5c6 | 1253 | seq_puts(seq, ",flushoncommit"); |
3cdde224 | 1254 | if (btrfs_test_opt(info, DISCARD)) |
20a5239a | 1255 | seq_puts(seq, ",discard"); |
0b246afa | 1256 | if (!(info->sb->s_flags & MS_POSIXACL)) |
a9572a15 | 1257 | seq_puts(seq, ",noacl"); |
3cdde224 | 1258 | if (btrfs_test_opt(info, SPACE_CACHE)) |
200da64e | 1259 | seq_puts(seq, ",space_cache"); |
3cdde224 | 1260 | else if (btrfs_test_opt(info, FREE_SPACE_TREE)) |
70f6d82e | 1261 | seq_puts(seq, ",space_cache=v2"); |
73bc1876 | 1262 | else |
8965593e | 1263 | seq_puts(seq, ",nospace_cache"); |
3cdde224 | 1264 | if (btrfs_test_opt(info, RESCAN_UUID_TREE)) |
f420ee1e | 1265 | seq_puts(seq, ",rescan_uuid_tree"); |
3cdde224 | 1266 | if (btrfs_test_opt(info, CLEAR_CACHE)) |
200da64e | 1267 | seq_puts(seq, ",clear_cache"); |
3cdde224 | 1268 | if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) |
200da64e | 1269 | seq_puts(seq, ",user_subvol_rm_allowed"); |
3cdde224 | 1270 | if (btrfs_test_opt(info, ENOSPC_DEBUG)) |
0942caa3 | 1271 | seq_puts(seq, ",enospc_debug"); |
3cdde224 | 1272 | if (btrfs_test_opt(info, AUTO_DEFRAG)) |
0942caa3 | 1273 | seq_puts(seq, ",autodefrag"); |
3cdde224 | 1274 | if (btrfs_test_opt(info, INODE_MAP_CACHE)) |
0942caa3 | 1275 | seq_puts(seq, ",inode_cache"); |
3cdde224 | 1276 | if (btrfs_test_opt(info, SKIP_BALANCE)) |
9555c6c1 | 1277 | seq_puts(seq, ",skip_balance"); |
8507d216 | 1278 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
3cdde224 | 1279 | if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) |
8507d216 | 1280 | seq_puts(seq, ",check_int_data"); |
3cdde224 | 1281 | else if (btrfs_test_opt(info, CHECK_INTEGRITY)) |
8507d216 WS |
1282 | seq_puts(seq, ",check_int"); |
1283 | if (info->check_integrity_print_mask) | |
1284 | seq_printf(seq, ",check_int_print_mask=%d", | |
1285 | info->check_integrity_print_mask); | |
1286 | #endif | |
1287 | if (info->metadata_ratio) | |
1288 | seq_printf(seq, ",metadata_ratio=%d", | |
1289 | info->metadata_ratio); | |
3cdde224 | 1290 | if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) |
8c342930 | 1291 | seq_puts(seq, ",fatal_errors=panic"); |
8b87dc17 DS |
1292 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
1293 | seq_printf(seq, ",commit=%d", info->commit_interval); | |
d0bd4560 | 1294 | #ifdef CONFIG_BTRFS_DEBUG |
3cdde224 | 1295 | if (btrfs_test_opt(info, FRAGMENT_DATA)) |
d0bd4560 | 1296 | seq_puts(seq, ",fragment=data"); |
3cdde224 | 1297 | if (btrfs_test_opt(info, FRAGMENT_METADATA)) |
d0bd4560 JB |
1298 | seq_puts(seq, ",fragment=metadata"); |
1299 | #endif | |
c8d3fe02 OS |
1300 | seq_printf(seq, ",subvolid=%llu", |
1301 | BTRFS_I(d_inode(dentry))->root->root_key.objectid); | |
1302 | seq_puts(seq, ",subvol="); | |
1303 | seq_dentry(seq, dentry, " \t\n\\"); | |
a9572a15 EP |
1304 | return 0; |
1305 | } | |
1306 | ||
a061fc8d | 1307 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 1308 | { |
815745cf AV |
1309 | struct btrfs_fs_info *p = data; |
1310 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 1311 | |
815745cf | 1312 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
1313 | } |
1314 | ||
450ba0ea JB |
1315 | static int btrfs_set_super(struct super_block *s, void *data) |
1316 | { | |
6de1d09d AV |
1317 | int err = set_anon_super(s, data); |
1318 | if (!err) | |
1319 | s->s_fs_info = data; | |
1320 | return err; | |
4b82d6e4 Y |
1321 | } |
1322 | ||
f9d9ef62 DS |
1323 | /* |
1324 | * subvolumes are identified by ino 256 | |
1325 | */ | |
1326 | static inline int is_subvolume_inode(struct inode *inode) | |
1327 | { | |
1328 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1329 | return 1; | |
1330 | return 0; | |
1331 | } | |
1332 | ||
830c4adb | 1333 | /* |
e6e4dbe8 OS |
1334 | * This will add subvolid=0 to the argument string while removing any subvol= |
1335 | * and subvolid= arguments to make sure we get the top-level root for path | |
1336 | * walking to the subvol we want. | |
830c4adb JB |
1337 | */ |
1338 | static char *setup_root_args(char *args) | |
1339 | { | |
e6e4dbe8 | 1340 | char *buf, *dst, *sep; |
830c4adb | 1341 | |
e6e4dbe8 OS |
1342 | if (!args) |
1343 | return kstrdup("subvolid=0", GFP_NOFS); | |
f60d16a8 | 1344 | |
e6e4dbe8 OS |
1345 | /* The worst case is that we add ",subvolid=0" to the end. */ |
1346 | buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS); | |
f60d16a8 | 1347 | if (!buf) |
830c4adb | 1348 | return NULL; |
830c4adb | 1349 | |
e6e4dbe8 OS |
1350 | while (1) { |
1351 | sep = strchrnul(args, ','); | |
1352 | if (!strstarts(args, "subvol=") && | |
1353 | !strstarts(args, "subvolid=")) { | |
1354 | memcpy(dst, args, sep - args); | |
1355 | dst += sep - args; | |
1356 | *dst++ = ','; | |
1357 | } | |
1358 | if (*sep) | |
1359 | args = sep + 1; | |
1360 | else | |
1361 | break; | |
830c4adb | 1362 | } |
f60d16a8 | 1363 | strcpy(dst, "subvolid=0"); |
830c4adb | 1364 | |
f60d16a8 | 1365 | return buf; |
830c4adb JB |
1366 | } |
1367 | ||
bb289b7b OS |
1368 | static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, |
1369 | int flags, const char *device_name, | |
1370 | char *data) | |
830c4adb | 1371 | { |
830c4adb | 1372 | struct dentry *root; |
fa330659 | 1373 | struct vfsmount *mnt = NULL; |
830c4adb | 1374 | char *newargs; |
fa330659 | 1375 | int ret; |
830c4adb JB |
1376 | |
1377 | newargs = setup_root_args(data); | |
fa330659 OS |
1378 | if (!newargs) { |
1379 | root = ERR_PTR(-ENOMEM); | |
1380 | goto out; | |
1381 | } | |
0723a047 | 1382 | |
fa330659 OS |
1383 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); |
1384 | if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { | |
0723a047 | 1385 | if (flags & MS_RDONLY) { |
fa330659 OS |
1386 | mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, |
1387 | device_name, newargs); | |
0723a047 | 1388 | } else { |
fa330659 OS |
1389 | mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, |
1390 | device_name, newargs); | |
0040e606 | 1391 | if (IS_ERR(mnt)) { |
fa330659 OS |
1392 | root = ERR_CAST(mnt); |
1393 | mnt = NULL; | |
1394 | goto out; | |
0040e606 | 1395 | } |
0723a047 | 1396 | |
773cd04e | 1397 | down_write(&mnt->mnt_sb->s_umount); |
fa330659 | 1398 | ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); |
773cd04e | 1399 | up_write(&mnt->mnt_sb->s_umount); |
fa330659 OS |
1400 | if (ret < 0) { |
1401 | root = ERR_PTR(ret); | |
1402 | goto out; | |
0723a047 HH |
1403 | } |
1404 | } | |
1405 | } | |
fa330659 OS |
1406 | if (IS_ERR(mnt)) { |
1407 | root = ERR_CAST(mnt); | |
1408 | mnt = NULL; | |
1409 | goto out; | |
1410 | } | |
830c4adb | 1411 | |
05dbe683 OS |
1412 | if (!subvol_name) { |
1413 | if (!subvol_objectid) { | |
1414 | ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), | |
1415 | &subvol_objectid); | |
1416 | if (ret) { | |
1417 | root = ERR_PTR(ret); | |
1418 | goto out; | |
1419 | } | |
1420 | } | |
1421 | subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), | |
1422 | subvol_objectid); | |
1423 | if (IS_ERR(subvol_name)) { | |
1424 | root = ERR_CAST(subvol_name); | |
1425 | subvol_name = NULL; | |
1426 | goto out; | |
1427 | } | |
1428 | ||
1429 | } | |
1430 | ||
ea441d11 | 1431 | root = mount_subtree(mnt, subvol_name); |
fa330659 OS |
1432 | /* mount_subtree() drops our reference on the vfsmount. */ |
1433 | mnt = NULL; | |
830c4adb | 1434 | |
bb289b7b | 1435 | if (!IS_ERR(root)) { |
ea441d11 | 1436 | struct super_block *s = root->d_sb; |
ab8d0fc4 | 1437 | struct btrfs_fs_info *fs_info = btrfs_sb(s); |
bb289b7b OS |
1438 | struct inode *root_inode = d_inode(root); |
1439 | u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; | |
1440 | ||
1441 | ret = 0; | |
1442 | if (!is_subvolume_inode(root_inode)) { | |
ab8d0fc4 | 1443 | btrfs_err(fs_info, "'%s' is not a valid subvolume", |
bb289b7b OS |
1444 | subvol_name); |
1445 | ret = -EINVAL; | |
1446 | } | |
1447 | if (subvol_objectid && root_objectid != subvol_objectid) { | |
05dbe683 OS |
1448 | /* |
1449 | * This will also catch a race condition where a | |
1450 | * subvolume which was passed by ID is renamed and | |
1451 | * another subvolume is renamed over the old location. | |
1452 | */ | |
ab8d0fc4 JM |
1453 | btrfs_err(fs_info, |
1454 | "subvol '%s' does not match subvolid %llu", | |
1455 | subvol_name, subvol_objectid); | |
bb289b7b OS |
1456 | ret = -EINVAL; |
1457 | } | |
1458 | if (ret) { | |
1459 | dput(root); | |
1460 | root = ERR_PTR(ret); | |
1461 | deactivate_locked_super(s); | |
1462 | } | |
f9d9ef62 DS |
1463 | } |
1464 | ||
fa330659 OS |
1465 | out: |
1466 | mntput(mnt); | |
1467 | kfree(newargs); | |
1468 | kfree(subvol_name); | |
830c4adb JB |
1469 | return root; |
1470 | } | |
450ba0ea | 1471 | |
f667aef6 QW |
1472 | static int parse_security_options(char *orig_opts, |
1473 | struct security_mnt_opts *sec_opts) | |
1474 | { | |
1475 | char *secdata = NULL; | |
1476 | int ret = 0; | |
1477 | ||
1478 | secdata = alloc_secdata(); | |
1479 | if (!secdata) | |
1480 | return -ENOMEM; | |
1481 | ret = security_sb_copy_data(orig_opts, secdata); | |
1482 | if (ret) { | |
1483 | free_secdata(secdata); | |
1484 | return ret; | |
1485 | } | |
1486 | ret = security_sb_parse_opts_str(secdata, sec_opts); | |
1487 | free_secdata(secdata); | |
1488 | return ret; | |
1489 | } | |
1490 | ||
1491 | static int setup_security_options(struct btrfs_fs_info *fs_info, | |
1492 | struct super_block *sb, | |
1493 | struct security_mnt_opts *sec_opts) | |
1494 | { | |
1495 | int ret = 0; | |
1496 | ||
1497 | /* | |
1498 | * Call security_sb_set_mnt_opts() to check whether new sec_opts | |
1499 | * is valid. | |
1500 | */ | |
1501 | ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); | |
1502 | if (ret) | |
1503 | return ret; | |
1504 | ||
a43bb39b | 1505 | #ifdef CONFIG_SECURITY |
f667aef6 QW |
1506 | if (!fs_info->security_opts.num_mnt_opts) { |
1507 | /* first time security setup, copy sec_opts to fs_info */ | |
1508 | memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); | |
1509 | } else { | |
1510 | /* | |
180e4d47 LB |
1511 | * Since SELinux (the only one supporting security_mnt_opts) |
1512 | * does NOT support changing context during remount/mount of | |
1513 | * the same sb, this must be the same or part of the same | |
1514 | * security options, just free it. | |
f667aef6 QW |
1515 | */ |
1516 | security_free_mnt_opts(sec_opts); | |
1517 | } | |
a43bb39b | 1518 | #endif |
f667aef6 QW |
1519 | return ret; |
1520 | } | |
1521 | ||
edf24abe CH |
1522 | /* |
1523 | * Find a superblock for the given device / mount point. | |
1524 | * | |
1525 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1526 | * for multiple device setup. Make sure to keep it in sync. | |
1527 | */ | |
061dbc6b | 1528 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1529 | const char *device_name, void *data) |
4b82d6e4 Y |
1530 | { |
1531 | struct block_device *bdev = NULL; | |
1532 | struct super_block *s; | |
8a4b83cc | 1533 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 1534 | struct btrfs_fs_info *fs_info = NULL; |
f667aef6 | 1535 | struct security_mnt_opts new_sec_opts; |
97288f2c | 1536 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1537 | char *subvol_name = NULL; |
1538 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
1539 | int error = 0; |
1540 | ||
97288f2c CH |
1541 | if (!(flags & MS_RDONLY)) |
1542 | mode |= FMODE_WRITE; | |
1543 | ||
1544 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 1545 | &subvol_name, &subvol_objectid, |
5e2a4b25 | 1546 | &fs_devices); |
f23c8af8 ID |
1547 | if (error) { |
1548 | kfree(subvol_name); | |
061dbc6b | 1549 | return ERR_PTR(error); |
f23c8af8 | 1550 | } |
edf24abe | 1551 | |
05dbe683 | 1552 | if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
fa330659 | 1553 | /* mount_subvol() will free subvol_name. */ |
bb289b7b OS |
1554 | return mount_subvol(subvol_name, subvol_objectid, flags, |
1555 | device_name, data); | |
830c4adb JB |
1556 | } |
1557 | ||
f667aef6 QW |
1558 | security_init_mnt_opts(&new_sec_opts); |
1559 | if (data) { | |
1560 | error = parse_security_options(data, &new_sec_opts); | |
1561 | if (error) | |
1562 | return ERR_PTR(error); | |
1563 | } | |
1564 | ||
306e16ce | 1565 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 1566 | if (error) |
f667aef6 | 1567 | goto error_sec_opts; |
4b82d6e4 | 1568 | |
450ba0ea JB |
1569 | /* |
1570 | * Setup a dummy root and fs_info for test/set super. This is because | |
1571 | * we don't actually fill this stuff out until open_ctree, but we need | |
1572 | * it for searching for existing supers, so this lets us do that and | |
1573 | * then open_ctree will properly initialize everything later. | |
1574 | */ | |
1575 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
f667aef6 QW |
1576 | if (!fs_info) { |
1577 | error = -ENOMEM; | |
1578 | goto error_sec_opts; | |
1579 | } | |
04d21a24 | 1580 | |
450ba0ea | 1581 | fs_info->fs_devices = fs_devices; |
450ba0ea | 1582 | |
6c41761f DS |
1583 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
1584 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
f667aef6 | 1585 | security_init_mnt_opts(&fs_info->security_opts); |
6c41761f DS |
1586 | if (!fs_info->super_copy || !fs_info->super_for_commit) { |
1587 | error = -ENOMEM; | |
04d21a24 ID |
1588 | goto error_fs_info; |
1589 | } | |
1590 | ||
1591 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1592 | if (error) | |
1593 | goto error_fs_info; | |
1594 | ||
1595 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1596 | error = -EACCES; | |
6c41761f DS |
1597 | goto error_close_devices; |
1598 | } | |
1599 | ||
dfe25020 | 1600 | bdev = fs_devices->latest_bdev; |
9249e17f DH |
1601 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
1602 | fs_info); | |
830c4adb JB |
1603 | if (IS_ERR(s)) { |
1604 | error = PTR_ERR(s); | |
1605 | goto error_close_devices; | |
1606 | } | |
4b82d6e4 Y |
1607 | |
1608 | if (s->s_root) { | |
2b82032c | 1609 | btrfs_close_devices(fs_devices); |
6c41761f | 1610 | free_fs_info(fs_info); |
59553edf AV |
1611 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1612 | error = -EBUSY; | |
4b82d6e4 | 1613 | } else { |
a1c6f057 | 1614 | snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); |
815745cf | 1615 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1616 | error = btrfs_fill_super(s, fs_devices, data, |
1617 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 1618 | } |
05dbe683 | 1619 | if (error) { |
f667aef6 | 1620 | deactivate_locked_super(s); |
f667aef6 QW |
1621 | goto error_sec_opts; |
1622 | } | |
1623 | ||
1624 | fs_info = btrfs_sb(s); | |
1625 | error = setup_security_options(fs_info, s, &new_sec_opts); | |
1626 | if (error) { | |
830c4adb | 1627 | deactivate_locked_super(s); |
f667aef6 QW |
1628 | goto error_sec_opts; |
1629 | } | |
4b82d6e4 | 1630 | |
05dbe683 | 1631 | return dget(s->s_root); |
4b82d6e4 | 1632 | |
c146afad | 1633 | error_close_devices: |
8a4b83cc | 1634 | btrfs_close_devices(fs_devices); |
04d21a24 | 1635 | error_fs_info: |
6c41761f | 1636 | free_fs_info(fs_info); |
f667aef6 QW |
1637 | error_sec_opts: |
1638 | security_free_mnt_opts(&new_sec_opts); | |
061dbc6b | 1639 | return ERR_PTR(error); |
4b82d6e4 | 1640 | } |
2e635a27 | 1641 | |
0d2450ab ST |
1642 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
1643 | int new_pool_size, int old_pool_size) | |
1644 | { | |
1645 | if (new_pool_size == old_pool_size) | |
1646 | return; | |
1647 | ||
1648 | fs_info->thread_pool_size = new_pool_size; | |
1649 | ||
efe120a0 | 1650 | btrfs_info(fs_info, "resize thread pool %d -> %d", |
0d2450ab ST |
1651 | old_pool_size, new_pool_size); |
1652 | ||
5cdc7ad3 | 1653 | btrfs_workqueue_set_max(fs_info->workers, new_pool_size); |
afe3d242 | 1654 | btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); |
a8c93d4e | 1655 | btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); |
e66f0bb1 | 1656 | btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); |
fccb5d86 QW |
1657 | btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); |
1658 | btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); | |
1659 | btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, | |
1660 | new_pool_size); | |
1661 | btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); | |
1662 | btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); | |
5b3bc44e | 1663 | btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); |
736cfa15 | 1664 | btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); |
0339ef2f QW |
1665 | btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, |
1666 | new_pool_size); | |
0d2450ab ST |
1667 | } |
1668 | ||
f42a34b2 | 1669 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
dc81cdc5 MX |
1670 | { |
1671 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
f42a34b2 | 1672 | } |
dc81cdc5 | 1673 | |
f42a34b2 MX |
1674 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
1675 | unsigned long old_opts, int flags) | |
1676 | { | |
dc81cdc5 MX |
1677 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1678 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1679 | (flags & MS_RDONLY))) { | |
1680 | /* wait for any defraggers to finish */ | |
1681 | wait_event(fs_info->transaction_wait, | |
1682 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1683 | if (flags & MS_RDONLY) | |
1684 | sync_filesystem(fs_info->sb); | |
1685 | } | |
1686 | } | |
1687 | ||
1688 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1689 | unsigned long old_opts) | |
1690 | { | |
1691 | /* | |
180e4d47 LB |
1692 | * We need to cleanup all defragable inodes if the autodefragment is |
1693 | * close or the filesystem is read only. | |
dc81cdc5 MX |
1694 | */ |
1695 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1696 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1697 | (fs_info->sb->s_flags & MS_RDONLY))) { | |
1698 | btrfs_cleanup_defrag_inodes(fs_info); | |
1699 | } | |
1700 | ||
1701 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1702 | } | |
1703 | ||
c146afad YZ |
1704 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1705 | { | |
815745cf AV |
1706 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1707 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1708 | unsigned old_flags = sb->s_flags; |
1709 | unsigned long old_opts = fs_info->mount_opt; | |
1710 | unsigned long old_compress_type = fs_info->compress_type; | |
1711 | u64 old_max_inline = fs_info->max_inline; | |
1712 | u64 old_alloc_start = fs_info->alloc_start; | |
1713 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1714 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
c146afad YZ |
1715 | int ret; |
1716 | ||
02b9984d | 1717 | sync_filesystem(sb); |
f42a34b2 | 1718 | btrfs_remount_prepare(fs_info); |
dc81cdc5 | 1719 | |
f667aef6 QW |
1720 | if (data) { |
1721 | struct security_mnt_opts new_sec_opts; | |
1722 | ||
1723 | security_init_mnt_opts(&new_sec_opts); | |
1724 | ret = parse_security_options(data, &new_sec_opts); | |
1725 | if (ret) | |
1726 | goto restore; | |
1727 | ret = setup_security_options(fs_info, sb, | |
1728 | &new_sec_opts); | |
1729 | if (ret) { | |
1730 | security_free_mnt_opts(&new_sec_opts); | |
1731 | goto restore; | |
1732 | } | |
1733 | } | |
1734 | ||
2ff7e61e | 1735 | ret = btrfs_parse_options(fs_info, data, *flags); |
49b25e05 JM |
1736 | if (ret) { |
1737 | ret = -EINVAL; | |
1738 | goto restore; | |
1739 | } | |
b288052e | 1740 | |
f42a34b2 | 1741 | btrfs_remount_begin(fs_info, old_opts, *flags); |
0d2450ab ST |
1742 | btrfs_resize_thread_pool(fs_info, |
1743 | fs_info->thread_pool_size, old_thread_pool_size); | |
1744 | ||
c146afad | 1745 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
dc81cdc5 | 1746 | goto out; |
c146afad YZ |
1747 | |
1748 | if (*flags & MS_RDONLY) { | |
8dabb742 SB |
1749 | /* |
1750 | * this also happens on 'umount -rf' or on shutdown, when | |
1751 | * the filesystem is busy. | |
1752 | */ | |
21c7e756 | 1753 | cancel_work_sync(&fs_info->async_reclaim_work); |
361c093d SB |
1754 | |
1755 | /* wait for the uuid_scan task to finish */ | |
1756 | down(&fs_info->uuid_tree_rescan_sem); | |
1757 | /* avoid complains from lockdep et al. */ | |
1758 | up(&fs_info->uuid_tree_rescan_sem); | |
1759 | ||
c146afad YZ |
1760 | sb->s_flags |= MS_RDONLY; |
1761 | ||
e44163e1 JM |
1762 | /* |
1763 | * Setting MS_RDONLY will put the cleaner thread to | |
1764 | * sleep at the next loop if it's already active. | |
1765 | * If it's already asleep, we'll leave unused block | |
1766 | * groups on disk until we're mounted read-write again | |
1767 | * unless we clean them up here. | |
1768 | */ | |
e44163e1 | 1769 | btrfs_delete_unused_bgs(fs_info); |
e44163e1 | 1770 | |
8dabb742 SB |
1771 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1772 | btrfs_scrub_cancel(fs_info); | |
061594ef | 1773 | btrfs_pause_balance(fs_info); |
8dabb742 | 1774 | |
6bccf3ab | 1775 | ret = btrfs_commit_super(fs_info); |
49b25e05 JM |
1776 | if (ret) |
1777 | goto restore; | |
c146afad | 1778 | } else { |
0b246afa | 1779 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
6ef3de9c | 1780 | btrfs_err(fs_info, |
efe120a0 | 1781 | "Remounting read-write after error is not allowed"); |
6ef3de9c DS |
1782 | ret = -EINVAL; |
1783 | goto restore; | |
1784 | } | |
8a3db184 | 1785 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1786 | ret = -EACCES; |
1787 | goto restore; | |
8a3db184 | 1788 | } |
2b82032c | 1789 | |
292fd7fc SB |
1790 | if (fs_info->fs_devices->missing_devices > |
1791 | fs_info->num_tolerated_disk_barrier_failures && | |
1792 | !(*flags & MS_RDONLY)) { | |
efe120a0 FH |
1793 | btrfs_warn(fs_info, |
1794 | "too many missing devices, writeable remount is not allowed"); | |
292fd7fc SB |
1795 | ret = -EACCES; |
1796 | goto restore; | |
1797 | } | |
1798 | ||
8a3db184 | 1799 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1800 | ret = -EINVAL; |
1801 | goto restore; | |
8a3db184 | 1802 | } |
c146afad | 1803 | |
815745cf | 1804 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1805 | if (ret) |
1806 | goto restore; | |
c146afad | 1807 | |
d68fc57b | 1808 | /* recover relocation */ |
5f316481 | 1809 | mutex_lock(&fs_info->cleaner_mutex); |
d68fc57b | 1810 | ret = btrfs_recover_relocation(root); |
5f316481 | 1811 | mutex_unlock(&fs_info->cleaner_mutex); |
49b25e05 JM |
1812 | if (ret) |
1813 | goto restore; | |
c146afad | 1814 | |
2b6ba629 ID |
1815 | ret = btrfs_resume_balance_async(fs_info); |
1816 | if (ret) | |
1817 | goto restore; | |
1818 | ||
8dabb742 SB |
1819 | ret = btrfs_resume_dev_replace_async(fs_info); |
1820 | if (ret) { | |
efe120a0 | 1821 | btrfs_warn(fs_info, "failed to resume dev_replace"); |
8dabb742 SB |
1822 | goto restore; |
1823 | } | |
94aebfb2 JB |
1824 | |
1825 | if (!fs_info->uuid_root) { | |
efe120a0 | 1826 | btrfs_info(fs_info, "creating UUID tree"); |
94aebfb2 JB |
1827 | ret = btrfs_create_uuid_tree(fs_info); |
1828 | if (ret) { | |
5d163e0e JM |
1829 | btrfs_warn(fs_info, |
1830 | "failed to create the UUID tree %d", | |
1831 | ret); | |
94aebfb2 JB |
1832 | goto restore; |
1833 | } | |
1834 | } | |
c146afad | 1835 | sb->s_flags &= ~MS_RDONLY; |
90c711ab | 1836 | |
afcdd129 | 1837 | set_bit(BTRFS_FS_OPEN, &fs_info->flags); |
c146afad | 1838 | } |
dc81cdc5 | 1839 | out: |
2c6a92b0 | 1840 | wake_up_process(fs_info->transaction_kthread); |
dc81cdc5 | 1841 | btrfs_remount_cleanup(fs_info, old_opts); |
c146afad | 1842 | return 0; |
49b25e05 JM |
1843 | |
1844 | restore: | |
1845 | /* We've hit an error - don't reset MS_RDONLY */ | |
1846 | if (sb->s_flags & MS_RDONLY) | |
1847 | old_flags |= MS_RDONLY; | |
1848 | sb->s_flags = old_flags; | |
1849 | fs_info->mount_opt = old_opts; | |
1850 | fs_info->compress_type = old_compress_type; | |
1851 | fs_info->max_inline = old_max_inline; | |
c018daec | 1852 | mutex_lock(&fs_info->chunk_mutex); |
49b25e05 | 1853 | fs_info->alloc_start = old_alloc_start; |
c018daec | 1854 | mutex_unlock(&fs_info->chunk_mutex); |
0d2450ab ST |
1855 | btrfs_resize_thread_pool(fs_info, |
1856 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 | 1857 | fs_info->metadata_ratio = old_metadata_ratio; |
dc81cdc5 | 1858 | btrfs_remount_cleanup(fs_info, old_opts); |
49b25e05 | 1859 | return ret; |
c146afad YZ |
1860 | } |
1861 | ||
bcd53741 AJ |
1862 | /* Used to sort the devices by max_avail(descending sort) */ |
1863 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1864 | const void *dev_info2) | |
1865 | { | |
1866 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1867 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1868 | return -1; | |
1869 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1870 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1871 | return 1; | |
1872 | else | |
1873 | return 0; | |
1874 | } | |
1875 | ||
1876 | /* | |
1877 | * sort the devices by max_avail, in which max free extent size of each device | |
1878 | * is stored.(Descending Sort) | |
1879 | */ | |
1880 | static inline void btrfs_descending_sort_devices( | |
1881 | struct btrfs_device_info *devices, | |
1882 | size_t nr_devices) | |
1883 | { | |
1884 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1885 | btrfs_cmp_device_free_bytes, NULL); | |
1886 | } | |
1887 | ||
6d07bcec MX |
1888 | /* |
1889 | * The helper to calc the free space on the devices that can be used to store | |
1890 | * file data. | |
1891 | */ | |
6bccf3ab JM |
1892 | static int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, |
1893 | u64 *free_bytes) | |
6d07bcec | 1894 | { |
6bccf3ab | 1895 | struct btrfs_root *root = fs_info->tree_root; |
6d07bcec MX |
1896 | struct btrfs_device_info *devices_info; |
1897 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1898 | struct btrfs_device *device; | |
1899 | u64 skip_space; | |
1900 | u64 type; | |
1901 | u64 avail_space; | |
1902 | u64 used_space; | |
1903 | u64 min_stripe_size; | |
39fb26c3 | 1904 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1905 | int i = 0, nr_devices; |
1906 | int ret; | |
1907 | ||
7e33fd99 | 1908 | /* |
01327610 | 1909 | * We aren't under the device list lock, so this is racy-ish, but good |
7e33fd99 JB |
1910 | * enough for our purposes. |
1911 | */ | |
b772a86e | 1912 | nr_devices = fs_info->fs_devices->open_devices; |
7e33fd99 JB |
1913 | if (!nr_devices) { |
1914 | smp_mb(); | |
1915 | nr_devices = fs_info->fs_devices->open_devices; | |
1916 | ASSERT(nr_devices); | |
1917 | if (!nr_devices) { | |
1918 | *free_bytes = 0; | |
1919 | return 0; | |
1920 | } | |
1921 | } | |
6d07bcec | 1922 | |
d9b0d9ba | 1923 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
6d07bcec MX |
1924 | GFP_NOFS); |
1925 | if (!devices_info) | |
1926 | return -ENOMEM; | |
1927 | ||
01327610 | 1928 | /* calc min stripe number for data space allocation */ |
6d07bcec | 1929 | type = btrfs_get_alloc_profile(root, 1); |
39fb26c3 | 1930 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1931 | min_stripes = 2; |
39fb26c3 MX |
1932 | num_stripes = nr_devices; |
1933 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1934 | min_stripes = 2; |
39fb26c3 MX |
1935 | num_stripes = 2; |
1936 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1937 | min_stripes = 4; |
39fb26c3 MX |
1938 | num_stripes = 4; |
1939 | } | |
6d07bcec MX |
1940 | |
1941 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1942 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1943 | else | |
1944 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1945 | ||
7e33fd99 JB |
1946 | if (fs_info->alloc_start) |
1947 | mutex_lock(&fs_devices->device_list_mutex); | |
1948 | rcu_read_lock(); | |
1949 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { | |
63a212ab SB |
1950 | if (!device->in_fs_metadata || !device->bdev || |
1951 | device->is_tgtdev_for_dev_replace) | |
6d07bcec MX |
1952 | continue; |
1953 | ||
7e33fd99 JB |
1954 | if (i >= nr_devices) |
1955 | break; | |
1956 | ||
6d07bcec MX |
1957 | avail_space = device->total_bytes - device->bytes_used; |
1958 | ||
1959 | /* align with stripe_len */ | |
f8c269d7 | 1960 | avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); |
6d07bcec MX |
1961 | avail_space *= BTRFS_STRIPE_LEN; |
1962 | ||
1963 | /* | |
01327610 | 1964 | * In order to avoid overwriting the superblock on the drive, |
6d07bcec MX |
1965 | * btrfs starts at an offset of at least 1MB when doing chunk |
1966 | * allocation. | |
1967 | */ | |
ee22184b | 1968 | skip_space = SZ_1M; |
6d07bcec MX |
1969 | |
1970 | /* user can set the offset in fs_info->alloc_start. */ | |
7e33fd99 JB |
1971 | if (fs_info->alloc_start && |
1972 | fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1973 | device->total_bytes) { | |
1974 | rcu_read_unlock(); | |
6d07bcec MX |
1975 | skip_space = max(fs_info->alloc_start, skip_space); |
1976 | ||
7e33fd99 JB |
1977 | /* |
1978 | * btrfs can not use the free space in | |
1979 | * [0, skip_space - 1], we must subtract it from the | |
1980 | * total. In order to implement it, we account the used | |
1981 | * space in this range first. | |
1982 | */ | |
1983 | ret = btrfs_account_dev_extents_size(device, 0, | |
1984 | skip_space - 1, | |
1985 | &used_space); | |
1986 | if (ret) { | |
1987 | kfree(devices_info); | |
1988 | mutex_unlock(&fs_devices->device_list_mutex); | |
1989 | return ret; | |
1990 | } | |
1991 | ||
1992 | rcu_read_lock(); | |
6d07bcec | 1993 | |
7e33fd99 JB |
1994 | /* calc the free space in [0, skip_space - 1] */ |
1995 | skip_space -= used_space; | |
1996 | } | |
6d07bcec MX |
1997 | |
1998 | /* | |
1999 | * we can use the free space in [0, skip_space - 1], subtract | |
2000 | * it from the total. | |
2001 | */ | |
2002 | if (avail_space && avail_space >= skip_space) | |
2003 | avail_space -= skip_space; | |
2004 | else | |
2005 | avail_space = 0; | |
2006 | ||
2007 | if (avail_space < min_stripe_size) | |
2008 | continue; | |
2009 | ||
2010 | devices_info[i].dev = device; | |
2011 | devices_info[i].max_avail = avail_space; | |
2012 | ||
2013 | i++; | |
2014 | } | |
7e33fd99 JB |
2015 | rcu_read_unlock(); |
2016 | if (fs_info->alloc_start) | |
2017 | mutex_unlock(&fs_devices->device_list_mutex); | |
6d07bcec MX |
2018 | |
2019 | nr_devices = i; | |
2020 | ||
2021 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
2022 | ||
2023 | i = nr_devices - 1; | |
2024 | avail_space = 0; | |
2025 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
2026 | if (num_stripes > nr_devices) |
2027 | num_stripes = nr_devices; | |
2028 | ||
6d07bcec MX |
2029 | if (devices_info[i].max_avail >= min_stripe_size) { |
2030 | int j; | |
2031 | u64 alloc_size; | |
2032 | ||
39fb26c3 | 2033 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 2034 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 2035 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
2036 | devices_info[j].max_avail -= alloc_size; |
2037 | } | |
2038 | i--; | |
2039 | nr_devices--; | |
2040 | } | |
2041 | ||
2042 | kfree(devices_info); | |
2043 | *free_bytes = avail_space; | |
2044 | return 0; | |
2045 | } | |
2046 | ||
ba7b6e62 DS |
2047 | /* |
2048 | * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. | |
2049 | * | |
2050 | * If there's a redundant raid level at DATA block groups, use the respective | |
2051 | * multiplier to scale the sizes. | |
2052 | * | |
2053 | * Unused device space usage is based on simulating the chunk allocator | |
2054 | * algorithm that respects the device sizes, order of allocations and the | |
2055 | * 'alloc_start' value, this is a close approximation of the actual use but | |
2056 | * there are other factors that may change the result (like a new metadata | |
2057 | * chunk). | |
2058 | * | |
ca8a51b3 | 2059 | * If metadata is exhausted, f_bavail will be 0. |
ba7b6e62 | 2060 | */ |
8fd17795 CM |
2061 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2062 | { | |
815745cf AV |
2063 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
2064 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
2065 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
2066 | struct btrfs_space_info *found; |
2067 | u64 total_used = 0; | |
6d07bcec | 2068 | u64 total_free_data = 0; |
ca8a51b3 | 2069 | u64 total_free_meta = 0; |
db94535d | 2070 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 2071 | __be32 *fsid = (__be32 *)fs_info->fsid; |
ba7b6e62 DS |
2072 | unsigned factor = 1; |
2073 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
6d07bcec | 2074 | int ret; |
ca8a51b3 | 2075 | u64 thresh = 0; |
ae02d1bd | 2076 | int mixed = 0; |
8fd17795 | 2077 | |
bd4d1088 | 2078 | rcu_read_lock(); |
89a55897 | 2079 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec | 2080 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
ba7b6e62 DS |
2081 | int i; |
2082 | ||
6d07bcec MX |
2083 | total_free_data += found->disk_total - found->disk_used; |
2084 | total_free_data -= | |
2085 | btrfs_account_ro_block_groups_free_space(found); | |
ba7b6e62 DS |
2086 | |
2087 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
2088 | if (!list_empty(&found->block_groups[i])) { | |
2089 | switch (i) { | |
2090 | case BTRFS_RAID_DUP: | |
2091 | case BTRFS_RAID_RAID1: | |
2092 | case BTRFS_RAID_RAID10: | |
2093 | factor = 2; | |
2094 | } | |
2095 | } | |
2096 | } | |
6d07bcec | 2097 | } |
ae02d1bd LB |
2098 | |
2099 | /* | |
2100 | * Metadata in mixed block goup profiles are accounted in data | |
2101 | */ | |
2102 | if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
2103 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) | |
2104 | mixed = 1; | |
2105 | else | |
2106 | total_free_meta += found->disk_total - | |
2107 | found->disk_used; | |
2108 | } | |
6d07bcec | 2109 | |
b742bb82 | 2110 | total_used += found->disk_used; |
89a55897 | 2111 | } |
ba7b6e62 | 2112 | |
bd4d1088 JB |
2113 | rcu_read_unlock(); |
2114 | ||
ba7b6e62 DS |
2115 | buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); |
2116 | buf->f_blocks >>= bits; | |
2117 | buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); | |
2118 | ||
2119 | /* Account global block reserve as used, it's in logical size already */ | |
2120 | spin_lock(&block_rsv->lock); | |
41b34acc LB |
2121 | /* Mixed block groups accounting is not byte-accurate, avoid overflow */ |
2122 | if (buf->f_bfree >= block_rsv->size >> bits) | |
2123 | buf->f_bfree -= block_rsv->size >> bits; | |
2124 | else | |
2125 | buf->f_bfree = 0; | |
ba7b6e62 DS |
2126 | spin_unlock(&block_rsv->lock); |
2127 | ||
0d95c1be | 2128 | buf->f_bavail = div_u64(total_free_data, factor); |
6bccf3ab | 2129 | ret = btrfs_calc_avail_data_space(fs_info, &total_free_data); |
7e33fd99 | 2130 | if (ret) |
6d07bcec | 2131 | return ret; |
ba7b6e62 | 2132 | buf->f_bavail += div_u64(total_free_data, factor); |
6d07bcec | 2133 | buf->f_bavail = buf->f_bavail >> bits; |
d397712b | 2134 | |
ca8a51b3 DS |
2135 | /* |
2136 | * We calculate the remaining metadata space minus global reserve. If | |
2137 | * this is (supposedly) smaller than zero, there's no space. But this | |
2138 | * does not hold in practice, the exhausted state happens where's still | |
2139 | * some positive delta. So we apply some guesswork and compare the | |
2140 | * delta to a 4M threshold. (Practically observed delta was ~2M.) | |
2141 | * | |
2142 | * We probably cannot calculate the exact threshold value because this | |
2143 | * depends on the internal reservations requested by various | |
2144 | * operations, so some operations that consume a few metadata will | |
2145 | * succeed even if the Avail is zero. But this is better than the other | |
2146 | * way around. | |
2147 | */ | |
2148 | thresh = 4 * 1024 * 1024; | |
2149 | ||
ae02d1bd | 2150 | if (!mixed && total_free_meta - thresh < block_rsv->size) |
ca8a51b3 DS |
2151 | buf->f_bavail = 0; |
2152 | ||
ba7b6e62 DS |
2153 | buf->f_type = BTRFS_SUPER_MAGIC; |
2154 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2155 | buf->f_namelen = BTRFS_NAME_LEN; | |
2156 | ||
9d03632e | 2157 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 2158 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
2159 | on a big-endian or little-endian host */ |
2160 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
2161 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 | 2162 | /* Mask in the root object ID too, to disambiguate subvols */ |
2b0143b5 DH |
2163 | buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; |
2164 | buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; | |
32d48fa1 | 2165 | |
8fd17795 CM |
2166 | return 0; |
2167 | } | |
b5133862 | 2168 | |
aea52e19 AV |
2169 | static void btrfs_kill_super(struct super_block *sb) |
2170 | { | |
815745cf | 2171 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 2172 | kill_anon_super(sb); |
d22ca7de | 2173 | free_fs_info(fs_info); |
aea52e19 AV |
2174 | } |
2175 | ||
2e635a27 CM |
2176 | static struct file_system_type btrfs_fs_type = { |
2177 | .owner = THIS_MODULE, | |
2178 | .name = "btrfs", | |
061dbc6b | 2179 | .mount = btrfs_mount, |
aea52e19 | 2180 | .kill_sb = btrfs_kill_super, |
f667aef6 | 2181 | .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, |
2e635a27 | 2182 | }; |
7f78e035 | 2183 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 2184 | |
d8620958 TVB |
2185 | static int btrfs_control_open(struct inode *inode, struct file *file) |
2186 | { | |
2187 | /* | |
2188 | * The control file's private_data is used to hold the | |
2189 | * transaction when it is started and is used to keep | |
2190 | * track of whether a transaction is already in progress. | |
2191 | */ | |
2192 | file->private_data = NULL; | |
2193 | return 0; | |
2194 | } | |
2195 | ||
d352ac68 CM |
2196 | /* |
2197 | * used by btrfsctl to scan devices when no FS is mounted | |
2198 | */ | |
8a4b83cc CM |
2199 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
2200 | unsigned long arg) | |
2201 | { | |
2202 | struct btrfs_ioctl_vol_args *vol; | |
2203 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 2204 | int ret = -ENOTTY; |
8a4b83cc | 2205 | |
e441d54d CM |
2206 | if (!capable(CAP_SYS_ADMIN)) |
2207 | return -EPERM; | |
2208 | ||
dae7b665 LZ |
2209 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
2210 | if (IS_ERR(vol)) | |
2211 | return PTR_ERR(vol); | |
c071fcfd | 2212 | |
8a4b83cc CM |
2213 | switch (cmd) { |
2214 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 2215 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
2216 | &btrfs_fs_type, &fs_devices); |
2217 | break; | |
02db0844 JB |
2218 | case BTRFS_IOC_DEVICES_READY: |
2219 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
2220 | &btrfs_fs_type, &fs_devices); | |
2221 | if (ret) | |
2222 | break; | |
2223 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
2224 | break; | |
c5868f83 | 2225 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 2226 | ret = btrfs_ioctl_get_supported_features((void __user*)arg); |
c5868f83 | 2227 | break; |
8a4b83cc | 2228 | } |
dae7b665 | 2229 | |
8a4b83cc | 2230 | kfree(vol); |
f819d837 | 2231 | return ret; |
8a4b83cc CM |
2232 | } |
2233 | ||
0176260f | 2234 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 2235 | { |
354aa0fb | 2236 | struct btrfs_trans_handle *trans; |
0b246afa JM |
2237 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
2238 | struct btrfs_root *root = fs_info->tree_root; | |
354aa0fb | 2239 | |
0b246afa | 2240 | fs_info->fs_frozen = 1; |
9e7cc91a WX |
2241 | /* |
2242 | * We don't need a barrier here, we'll wait for any transaction that | |
2243 | * could be in progress on other threads (and do delayed iputs that | |
2244 | * we want to avoid on a frozen filesystem), or do the commit | |
2245 | * ourselves. | |
2246 | */ | |
d4edf39b | 2247 | trans = btrfs_attach_transaction_barrier(root); |
354aa0fb MX |
2248 | if (IS_ERR(trans)) { |
2249 | /* no transaction, don't bother */ | |
2250 | if (PTR_ERR(trans) == -ENOENT) | |
2251 | return 0; | |
2252 | return PTR_ERR(trans); | |
2253 | } | |
3a45bb20 | 2254 | return btrfs_commit_transaction(trans); |
ed0dab6b Y |
2255 | } |
2256 | ||
9e7cc91a WX |
2257 | static int btrfs_unfreeze(struct super_block *sb) |
2258 | { | |
0b246afa | 2259 | btrfs_sb(sb)->fs_frozen = 0; |
9e7cc91a WX |
2260 | return 0; |
2261 | } | |
2262 | ||
9c5085c1 JB |
2263 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
2264 | { | |
2265 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
2266 | struct btrfs_fs_devices *cur_devices; | |
2267 | struct btrfs_device *dev, *first_dev = NULL; | |
2268 | struct list_head *head; | |
2269 | struct rcu_string *name; | |
2270 | ||
2271 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
2272 | cur_devices = fs_info->fs_devices; | |
2273 | while (cur_devices) { | |
2274 | head = &cur_devices->devices; | |
2275 | list_for_each_entry(dev, head, dev_list) { | |
aa9ddcd4 JB |
2276 | if (dev->missing) |
2277 | continue; | |
0aeb8a6e AJ |
2278 | if (!dev->name) |
2279 | continue; | |
9c5085c1 JB |
2280 | if (!first_dev || dev->devid < first_dev->devid) |
2281 | first_dev = dev; | |
2282 | } | |
2283 | cur_devices = cur_devices->seed; | |
2284 | } | |
2285 | ||
2286 | if (first_dev) { | |
2287 | rcu_read_lock(); | |
2288 | name = rcu_dereference(first_dev->name); | |
2289 | seq_escape(m, name->str, " \t\n\\"); | |
2290 | rcu_read_unlock(); | |
2291 | } else { | |
2292 | WARN_ON(1); | |
2293 | } | |
2294 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
2295 | return 0; | |
2296 | } | |
2297 | ||
b87221de | 2298 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 2299 | .drop_inode = btrfs_drop_inode, |
bd555975 | 2300 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 2301 | .put_super = btrfs_put_super, |
d5719762 | 2302 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 2303 | .show_options = btrfs_show_options, |
9c5085c1 | 2304 | .show_devname = btrfs_show_devname, |
4730a4bc | 2305 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
2306 | .alloc_inode = btrfs_alloc_inode, |
2307 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2308 | .statfs = btrfs_statfs, |
c146afad | 2309 | .remount_fs = btrfs_remount, |
0176260f | 2310 | .freeze_fs = btrfs_freeze, |
9e7cc91a | 2311 | .unfreeze_fs = btrfs_unfreeze, |
e20d96d6 | 2312 | }; |
a9218f6b CM |
2313 | |
2314 | static const struct file_operations btrfs_ctl_fops = { | |
d8620958 | 2315 | .open = btrfs_control_open, |
a9218f6b CM |
2316 | .unlocked_ioctl = btrfs_control_ioctl, |
2317 | .compat_ioctl = btrfs_control_ioctl, | |
2318 | .owner = THIS_MODULE, | |
6038f373 | 2319 | .llseek = noop_llseek, |
a9218f6b CM |
2320 | }; |
2321 | ||
2322 | static struct miscdevice btrfs_misc = { | |
578454ff | 2323 | .minor = BTRFS_MINOR, |
a9218f6b CM |
2324 | .name = "btrfs-control", |
2325 | .fops = &btrfs_ctl_fops | |
2326 | }; | |
2327 | ||
578454ff KS |
2328 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
2329 | MODULE_ALIAS("devname:btrfs-control"); | |
2330 | ||
a9218f6b CM |
2331 | static int btrfs_interface_init(void) |
2332 | { | |
2333 | return misc_register(&btrfs_misc); | |
2334 | } | |
2335 | ||
b2950863 | 2336 | static void btrfs_interface_exit(void) |
a9218f6b | 2337 | { |
f368ed60 | 2338 | misc_deregister(&btrfs_misc); |
a9218f6b CM |
2339 | } |
2340 | ||
8ae1af3c | 2341 | static void btrfs_print_mod_info(void) |
85965600 | 2342 | { |
62e85577 | 2343 | pr_info("Btrfs loaded, crc32c=%s" |
85965600 DS |
2344 | #ifdef CONFIG_BTRFS_DEBUG |
2345 | ", debug=on" | |
2346 | #endif | |
79556c3d SB |
2347 | #ifdef CONFIG_BTRFS_ASSERT |
2348 | ", assert=on" | |
2349 | #endif | |
85965600 DS |
2350 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
2351 | ", integrity-checker=on" | |
2352 | #endif | |
5f9e1059 JM |
2353 | "\n", |
2354 | btrfs_crc32c_impl()); | |
85965600 DS |
2355 | } |
2356 | ||
2e635a27 CM |
2357 | static int __init init_btrfs_fs(void) |
2358 | { | |
2c90e5d6 | 2359 | int err; |
58176a96 | 2360 | |
14a958e6 FDBM |
2361 | err = btrfs_hash_init(); |
2362 | if (err) | |
2363 | return err; | |
2364 | ||
63541927 FDBM |
2365 | btrfs_props_init(); |
2366 | ||
58176a96 JB |
2367 | err = btrfs_init_sysfs(); |
2368 | if (err) | |
14a958e6 | 2369 | goto free_hash; |
58176a96 | 2370 | |
143bede5 | 2371 | btrfs_init_compress(); |
d1310b2e | 2372 | |
261507a0 LZ |
2373 | err = btrfs_init_cachep(); |
2374 | if (err) | |
2375 | goto free_compress; | |
2376 | ||
d1310b2e | 2377 | err = extent_io_init(); |
2f4cbe64 WB |
2378 | if (err) |
2379 | goto free_cachep; | |
2380 | ||
d1310b2e CM |
2381 | err = extent_map_init(); |
2382 | if (err) | |
2383 | goto free_extent_io; | |
2384 | ||
6352b91d | 2385 | err = ordered_data_init(); |
2f4cbe64 WB |
2386 | if (err) |
2387 | goto free_extent_map; | |
c8b97818 | 2388 | |
6352b91d MX |
2389 | err = btrfs_delayed_inode_init(); |
2390 | if (err) | |
2391 | goto free_ordered_data; | |
2392 | ||
9247f317 | 2393 | err = btrfs_auto_defrag_init(); |
16cdcec7 MX |
2394 | if (err) |
2395 | goto free_delayed_inode; | |
2396 | ||
78a6184a | 2397 | err = btrfs_delayed_ref_init(); |
9247f317 MX |
2398 | if (err) |
2399 | goto free_auto_defrag; | |
2400 | ||
b9e9a6cb WS |
2401 | err = btrfs_prelim_ref_init(); |
2402 | if (err) | |
af13b492 | 2403 | goto free_delayed_ref; |
b9e9a6cb | 2404 | |
97eb6b69 | 2405 | err = btrfs_end_io_wq_init(); |
78a6184a | 2406 | if (err) |
af13b492 | 2407 | goto free_prelim_ref; |
78a6184a | 2408 | |
97eb6b69 DS |
2409 | err = btrfs_interface_init(); |
2410 | if (err) | |
2411 | goto free_end_io_wq; | |
2412 | ||
e565d4b9 JS |
2413 | btrfs_init_lockdep(); |
2414 | ||
8ae1af3c | 2415 | btrfs_print_mod_info(); |
dc11dd5d JB |
2416 | |
2417 | err = btrfs_run_sanity_tests(); | |
2418 | if (err) | |
2419 | goto unregister_ioctl; | |
2420 | ||
2421 | err = register_filesystem(&btrfs_fs_type); | |
2422 | if (err) | |
2423 | goto unregister_ioctl; | |
74255aa0 | 2424 | |
2f4cbe64 WB |
2425 | return 0; |
2426 | ||
a9218f6b CM |
2427 | unregister_ioctl: |
2428 | btrfs_interface_exit(); | |
97eb6b69 DS |
2429 | free_end_io_wq: |
2430 | btrfs_end_io_wq_exit(); | |
b9e9a6cb WS |
2431 | free_prelim_ref: |
2432 | btrfs_prelim_ref_exit(); | |
78a6184a MX |
2433 | free_delayed_ref: |
2434 | btrfs_delayed_ref_exit(); | |
9247f317 MX |
2435 | free_auto_defrag: |
2436 | btrfs_auto_defrag_exit(); | |
16cdcec7 MX |
2437 | free_delayed_inode: |
2438 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
2439 | free_ordered_data: |
2440 | ordered_data_exit(); | |
2f4cbe64 WB |
2441 | free_extent_map: |
2442 | extent_map_exit(); | |
d1310b2e CM |
2443 | free_extent_io: |
2444 | extent_io_exit(); | |
2f4cbe64 WB |
2445 | free_cachep: |
2446 | btrfs_destroy_cachep(); | |
261507a0 LZ |
2447 | free_compress: |
2448 | btrfs_exit_compress(); | |
2f4cbe64 | 2449 | btrfs_exit_sysfs(); |
14a958e6 FDBM |
2450 | free_hash: |
2451 | btrfs_hash_exit(); | |
2f4cbe64 | 2452 | return err; |
2e635a27 CM |
2453 | } |
2454 | ||
2455 | static void __exit exit_btrfs_fs(void) | |
2456 | { | |
39279cc3 | 2457 | btrfs_destroy_cachep(); |
78a6184a | 2458 | btrfs_delayed_ref_exit(); |
9247f317 | 2459 | btrfs_auto_defrag_exit(); |
16cdcec7 | 2460 | btrfs_delayed_inode_exit(); |
b9e9a6cb | 2461 | btrfs_prelim_ref_exit(); |
6352b91d | 2462 | ordered_data_exit(); |
a52d9a80 | 2463 | extent_map_exit(); |
d1310b2e | 2464 | extent_io_exit(); |
a9218f6b | 2465 | btrfs_interface_exit(); |
5ed5f588 | 2466 | btrfs_end_io_wq_exit(); |
2e635a27 | 2467 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 2468 | btrfs_exit_sysfs(); |
8a4b83cc | 2469 | btrfs_cleanup_fs_uuids(); |
261507a0 | 2470 | btrfs_exit_compress(); |
14a958e6 | 2471 | btrfs_hash_exit(); |
2e635a27 CM |
2472 | } |
2473 | ||
60efa5eb | 2474 | late_initcall(init_btrfs_fs); |
2e635a27 CM |
2475 | module_exit(exit_btrfs_fs) |
2476 | ||
2477 | MODULE_LICENSE("GPL"); |