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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 | { |
3abdbd78 | 308 | close_ctree(btrfs_sb(sb)->tree_root); |
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 | */ |
96da0919 QW |
399 | int btrfs_parse_options(struct btrfs_root *root, char *options, |
400 | unsigned long new_flags) | |
95e05289 | 401 | { |
edf24abe | 402 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 403 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
404 | char *p, *num, *orig = NULL; |
405 | u64 cache_gen; | |
4543df7e | 406 | int intarg; |
a7a3f7ca | 407 | int ret = 0; |
261507a0 LZ |
408 | char *compress_type; |
409 | bool compress_force = false; | |
b7c47bbb TI |
410 | enum btrfs_compression_type saved_compress_type; |
411 | bool saved_compress_force; | |
412 | int no_compress = 0; | |
b6cda9bc | 413 | |
6c41761f | 414 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
70f6d82e OS |
415 | if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE)) |
416 | btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); | |
417 | else if (cache_gen) | |
73bc1876 JB |
418 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
419 | ||
96da0919 QW |
420 | /* |
421 | * Even the options are empty, we still need to do extra check | |
422 | * against new flags | |
423 | */ | |
95e05289 | 424 | if (!options) |
96da0919 | 425 | goto check; |
95e05289 | 426 | |
be20aa9d CM |
427 | /* |
428 | * strsep changes the string, duplicate it because parse_options | |
429 | * gets called twice | |
430 | */ | |
431 | options = kstrdup(options, GFP_NOFS); | |
432 | if (!options) | |
433 | return -ENOMEM; | |
434 | ||
da495ecc | 435 | orig = options; |
be20aa9d | 436 | |
edf24abe | 437 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
438 | int token; |
439 | if (!*p) | |
440 | continue; | |
441 | ||
442 | token = match_token(p, tokens, args); | |
443 | switch (token) { | |
dfe25020 | 444 | case Opt_degraded: |
efe120a0 | 445 | btrfs_info(root->fs_info, "allowing degraded mounts"); |
edf24abe | 446 | btrfs_set_opt(info->mount_opt, DEGRADED); |
dfe25020 | 447 | break; |
95e05289 | 448 | case Opt_subvol: |
73f73415 | 449 | case Opt_subvolid: |
e15d0542 | 450 | case Opt_subvolrootid: |
43e570b0 | 451 | case Opt_device: |
edf24abe | 452 | /* |
43e570b0 | 453 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
454 | * and can be happily ignored here. |
455 | */ | |
b6cda9bc CM |
456 | break; |
457 | case Opt_nodatasum: | |
3cdde224 | 458 | btrfs_set_and_info(info, NODATASUM, |
07802534 | 459 | "setting nodatasum"); |
be20aa9d | 460 | break; |
d399167d | 461 | case Opt_datasum: |
3cdde224 JM |
462 | if (btrfs_test_opt(info, NODATASUM)) { |
463 | if (btrfs_test_opt(info, NODATACOW)) | |
5d163e0e JM |
464 | btrfs_info(root->fs_info, |
465 | "setting datasum, datacow enabled"); | |
07802534 | 466 | else |
5d163e0e JM |
467 | btrfs_info(root->fs_info, |
468 | "setting datasum"); | |
07802534 | 469 | } |
d399167d QW |
470 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
471 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
472 | break; | |
be20aa9d | 473 | case Opt_nodatacow: |
3cdde224 JM |
474 | if (!btrfs_test_opt(info, NODATACOW)) { |
475 | if (!btrfs_test_opt(info, COMPRESS) || | |
476 | !btrfs_test_opt(info, FORCE_COMPRESS)) { | |
efe120a0 | 477 | btrfs_info(root->fs_info, |
07802534 QW |
478 | "setting nodatacow, compression disabled"); |
479 | } else { | |
5d163e0e JM |
480 | btrfs_info(root->fs_info, |
481 | "setting nodatacow"); | |
07802534 | 482 | } |
bedb2cca | 483 | } |
bedb2cca AP |
484 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
485 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
edf24abe CH |
486 | btrfs_set_opt(info->mount_opt, NODATACOW); |
487 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 488 | break; |
a258af7a | 489 | case Opt_datacow: |
3cdde224 | 490 | btrfs_clear_and_info(info, NODATACOW, |
07802534 | 491 | "setting datacow"); |
a258af7a | 492 | break; |
a555f810 | 493 | case Opt_compress_force: |
261507a0 LZ |
494 | case Opt_compress_force_type: |
495 | compress_force = true; | |
1c697d4a | 496 | /* Fallthrough */ |
261507a0 LZ |
497 | case Opt_compress: |
498 | case Opt_compress_type: | |
3cdde224 JM |
499 | saved_compress_type = btrfs_test_opt(info, |
500 | COMPRESS) ? | |
b7c47bbb TI |
501 | info->compress_type : BTRFS_COMPRESS_NONE; |
502 | saved_compress_force = | |
3cdde224 | 503 | btrfs_test_opt(info, FORCE_COMPRESS); |
261507a0 LZ |
504 | if (token == Opt_compress || |
505 | token == Opt_compress_force || | |
506 | strcmp(args[0].from, "zlib") == 0) { | |
507 | compress_type = "zlib"; | |
508 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
063849ea | 509 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
510 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
511 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
b7c47bbb | 512 | no_compress = 0; |
a6fa6fae LZ |
513 | } else if (strcmp(args[0].from, "lzo") == 0) { |
514 | compress_type = "lzo"; | |
515 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 516 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
517 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
518 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
2b0ce2c2 | 519 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
b7c47bbb | 520 | no_compress = 0; |
063849ea AH |
521 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
522 | compress_type = "no"; | |
063849ea AH |
523 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
524 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
525 | compress_force = false; | |
b7c47bbb | 526 | no_compress++; |
261507a0 LZ |
527 | } else { |
528 | ret = -EINVAL; | |
529 | goto out; | |
530 | } | |
531 | ||
261507a0 | 532 | if (compress_force) { |
b7c47bbb | 533 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); |
143f3636 | 534 | } else { |
4027e0f4 WS |
535 | /* |
536 | * If we remount from compress-force=xxx to | |
537 | * compress=xxx, we need clear FORCE_COMPRESS | |
538 | * flag, otherwise, there is no way for users | |
539 | * to disable forcible compression separately. | |
540 | */ | |
541 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
a7e252af | 542 | } |
3cdde224 | 543 | if ((btrfs_test_opt(info, COMPRESS) && |
b7c47bbb TI |
544 | (info->compress_type != saved_compress_type || |
545 | compress_force != saved_compress_force)) || | |
3cdde224 | 546 | (!btrfs_test_opt(info, COMPRESS) && |
b7c47bbb TI |
547 | no_compress == 1)) { |
548 | btrfs_info(root->fs_info, | |
549 | "%s %s compression", | |
550 | (compress_force) ? "force" : "use", | |
551 | compress_type); | |
552 | } | |
553 | compress_force = false; | |
a555f810 | 554 | break; |
e18e4809 | 555 | case Opt_ssd: |
3cdde224 | 556 | btrfs_set_and_info(info, SSD, |
07802534 | 557 | "use ssd allocation scheme"); |
e18e4809 | 558 | break; |
451d7585 | 559 | case Opt_ssd_spread: |
3cdde224 | 560 | btrfs_set_and_info(info, SSD_SPREAD, |
07802534 | 561 | "use spread ssd allocation scheme"); |
2aa06a35 | 562 | btrfs_set_opt(info->mount_opt, SSD); |
451d7585 | 563 | break; |
3b30c22f | 564 | case Opt_nossd: |
3cdde224 | 565 | btrfs_set_and_info(info, NOSSD, |
07802534 | 566 | "not using ssd allocation scheme"); |
3b30c22f CM |
567 | btrfs_clear_opt(info->mount_opt, SSD); |
568 | break; | |
842bef58 | 569 | case Opt_barrier: |
3cdde224 | 570 | btrfs_clear_and_info(info, NOBARRIER, |
07802534 | 571 | "turning on barriers"); |
842bef58 | 572 | break; |
21ad10cf | 573 | case Opt_nobarrier: |
3cdde224 | 574 | btrfs_set_and_info(info, NOBARRIER, |
07802534 | 575 | "turning off barriers"); |
21ad10cf | 576 | break; |
4543df7e | 577 | case Opt_thread_pool: |
2c334e87 WS |
578 | ret = match_int(&args[0], &intarg); |
579 | if (ret) { | |
580 | goto out; | |
581 | } else if (intarg > 0) { | |
4543df7e | 582 | info->thread_pool_size = intarg; |
2c334e87 WS |
583 | } else { |
584 | ret = -EINVAL; | |
585 | goto out; | |
586 | } | |
4543df7e | 587 | break; |
6f568d35 | 588 | case Opt_max_inline: |
edf24abe CH |
589 | num = match_strdup(&args[0]); |
590 | if (num) { | |
91748467 | 591 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
592 | kfree(num); |
593 | ||
15ada040 | 594 | if (info->max_inline) { |
feb5f965 | 595 | info->max_inline = min_t(u64, |
15ada040 CM |
596 | info->max_inline, |
597 | root->sectorsize); | |
598 | } | |
efe120a0 | 599 | btrfs_info(root->fs_info, "max_inline at %llu", |
c1c9ff7c | 600 | info->max_inline); |
2c334e87 WS |
601 | } else { |
602 | ret = -ENOMEM; | |
603 | goto out; | |
6f568d35 CM |
604 | } |
605 | break; | |
8f662a76 | 606 | case Opt_alloc_start: |
edf24abe CH |
607 | num = match_strdup(&args[0]); |
608 | if (num) { | |
c018daec | 609 | mutex_lock(&info->chunk_mutex); |
91748467 | 610 | info->alloc_start = memparse(num, NULL); |
c018daec | 611 | mutex_unlock(&info->chunk_mutex); |
edf24abe | 612 | kfree(num); |
5d163e0e JM |
613 | btrfs_info(root->fs_info, |
614 | "allocations start at %llu", | |
615 | info->alloc_start); | |
2c334e87 WS |
616 | } else { |
617 | ret = -ENOMEM; | |
618 | goto out; | |
8f662a76 CM |
619 | } |
620 | break; | |
bd0330ad | 621 | case Opt_acl: |
45ff35d6 | 622 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
bd0330ad QW |
623 | root->fs_info->sb->s_flags |= MS_POSIXACL; |
624 | break; | |
45ff35d6 GZ |
625 | #else |
626 | btrfs_err(root->fs_info, | |
627 | "support for ACL not compiled in!"); | |
628 | ret = -EINVAL; | |
629 | goto out; | |
630 | #endif | |
33268eaf JB |
631 | case Opt_noacl: |
632 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
633 | break; | |
3a5e1404 | 634 | case Opt_notreelog: |
3cdde224 | 635 | btrfs_set_and_info(info, NOTREELOG, |
07802534 | 636 | "disabling tree log"); |
a88998f2 QW |
637 | break; |
638 | case Opt_treelog: | |
3cdde224 | 639 | btrfs_clear_and_info(info, NOTREELOG, |
07802534 | 640 | "enabling tree log"); |
3a5e1404 | 641 | break; |
fed8f166 | 642 | case Opt_norecovery: |
96da0919 | 643 | case Opt_nologreplay: |
3cdde224 | 644 | btrfs_set_and_info(info, NOLOGREPLAY, |
96da0919 QW |
645 | "disabling log replay at mount time"); |
646 | break; | |
dccae999 | 647 | case Opt_flushoncommit: |
3cdde224 | 648 | btrfs_set_and_info(info, FLUSHONCOMMIT, |
07802534 | 649 | "turning on flush-on-commit"); |
dccae999 | 650 | break; |
2c9ee856 | 651 | case Opt_noflushoncommit: |
3cdde224 | 652 | btrfs_clear_and_info(info, FLUSHONCOMMIT, |
07802534 | 653 | "turning off flush-on-commit"); |
2c9ee856 | 654 | break; |
97e728d4 | 655 | case Opt_ratio: |
2c334e87 WS |
656 | ret = match_int(&args[0], &intarg); |
657 | if (ret) { | |
658 | goto out; | |
659 | } else if (intarg >= 0) { | |
97e728d4 | 660 | info->metadata_ratio = intarg; |
efe120a0 | 661 | btrfs_info(root->fs_info, "metadata ratio %d", |
97e728d4 | 662 | info->metadata_ratio); |
2c334e87 WS |
663 | } else { |
664 | ret = -EINVAL; | |
665 | goto out; | |
97e728d4 JB |
666 | } |
667 | break; | |
e244a0ae | 668 | case Opt_discard: |
3cdde224 | 669 | btrfs_set_and_info(info, DISCARD, |
07802534 | 670 | "turning on discard"); |
e244a0ae | 671 | break; |
e07a2ade | 672 | case Opt_nodiscard: |
3cdde224 | 673 | btrfs_clear_and_info(info, DISCARD, |
07802534 | 674 | "turning off discard"); |
e07a2ade | 675 | break; |
0af3d00b | 676 | case Opt_space_cache: |
70f6d82e OS |
677 | case Opt_space_cache_version: |
678 | if (token == Opt_space_cache || | |
679 | strcmp(args[0].from, "v1") == 0) { | |
680 | btrfs_clear_opt(root->fs_info->mount_opt, | |
681 | FREE_SPACE_TREE); | |
3cdde224 | 682 | btrfs_set_and_info(info, SPACE_CACHE, |
70f6d82e OS |
683 | "enabling disk space caching"); |
684 | } else if (strcmp(args[0].from, "v2") == 0) { | |
685 | btrfs_clear_opt(root->fs_info->mount_opt, | |
686 | SPACE_CACHE); | |
3cdde224 JM |
687 | btrfs_set_and_info(info, |
688 | FREE_SPACE_TREE, | |
70f6d82e OS |
689 | "enabling free space tree"); |
690 | } else { | |
691 | ret = -EINVAL; | |
692 | goto out; | |
693 | } | |
0de90876 | 694 | break; |
f420ee1e SB |
695 | case Opt_rescan_uuid_tree: |
696 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); | |
697 | break; | |
73bc1876 | 698 | case Opt_no_space_cache: |
3cdde224 JM |
699 | if (btrfs_test_opt(info, SPACE_CACHE)) { |
700 | btrfs_clear_and_info(info, | |
701 | SPACE_CACHE, | |
70f6d82e OS |
702 | "disabling disk space caching"); |
703 | } | |
3cdde224 JM |
704 | if (btrfs_test_opt(info, FREE_SPACE_TREE)) { |
705 | btrfs_clear_and_info(info, | |
706 | FREE_SPACE_TREE, | |
70f6d82e OS |
707 | "disabling free space tree"); |
708 | } | |
73bc1876 | 709 | break; |
4b9465cb | 710 | case Opt_inode_cache: |
7e1876ac | 711 | btrfs_set_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 712 | "enabling inode map caching"); |
3818aea2 QW |
713 | break; |
714 | case Opt_noinode_cache: | |
7e1876ac | 715 | btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 716 | "disabling inode map caching"); |
4b9465cb | 717 | break; |
88c2ba3b | 718 | case Opt_clear_cache: |
3cdde224 | 719 | btrfs_set_and_info(info, CLEAR_CACHE, |
07802534 | 720 | "force clearing of disk cache"); |
0af3d00b | 721 | break; |
4260f7c7 SW |
722 | case Opt_user_subvol_rm_allowed: |
723 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
724 | break; | |
91435650 CM |
725 | case Opt_enospc_debug: |
726 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
727 | break; | |
53036293 QW |
728 | case Opt_noenospc_debug: |
729 | btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); | |
730 | break; | |
4cb5300b | 731 | case Opt_defrag: |
3cdde224 | 732 | btrfs_set_and_info(info, AUTO_DEFRAG, |
07802534 | 733 | "enabling auto defrag"); |
4cb5300b | 734 | break; |
fc0ca9af | 735 | case Opt_nodefrag: |
3cdde224 | 736 | btrfs_clear_and_info(info, AUTO_DEFRAG, |
07802534 | 737 | "disabling auto defrag"); |
fc0ca9af | 738 | break; |
af31f5e5 | 739 | case Opt_recovery: |
8dcddfa0 QW |
740 | btrfs_warn(root->fs_info, |
741 | "'recovery' is deprecated, use 'usebackuproot' instead"); | |
742 | case Opt_usebackuproot: | |
743 | btrfs_info(root->fs_info, | |
744 | "trying to use backup root at mount time"); | |
745 | btrfs_set_opt(info->mount_opt, USEBACKUPROOT); | |
af31f5e5 | 746 | break; |
9555c6c1 ID |
747 | case Opt_skip_balance: |
748 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
749 | break; | |
21adbd5c SB |
750 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
751 | case Opt_check_integrity_including_extent_data: | |
efe120a0 FH |
752 | btrfs_info(root->fs_info, |
753 | "enabling check integrity including extent data"); | |
21adbd5c SB |
754 | btrfs_set_opt(info->mount_opt, |
755 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
756 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
757 | break; | |
758 | case Opt_check_integrity: | |
efe120a0 | 759 | btrfs_info(root->fs_info, "enabling check integrity"); |
21adbd5c SB |
760 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
761 | break; | |
762 | case Opt_check_integrity_print_mask: | |
2c334e87 WS |
763 | ret = match_int(&args[0], &intarg); |
764 | if (ret) { | |
765 | goto out; | |
766 | } else if (intarg >= 0) { | |
21adbd5c | 767 | info->check_integrity_print_mask = intarg; |
5d163e0e JM |
768 | btrfs_info(root->fs_info, |
769 | "check_integrity_print_mask 0x%x", | |
770 | info->check_integrity_print_mask); | |
2c334e87 WS |
771 | } else { |
772 | ret = -EINVAL; | |
773 | goto out; | |
21adbd5c SB |
774 | } |
775 | break; | |
776 | #else | |
777 | case Opt_check_integrity_including_extent_data: | |
778 | case Opt_check_integrity: | |
779 | case Opt_check_integrity_print_mask: | |
efe120a0 FH |
780 | btrfs_err(root->fs_info, |
781 | "support for check_integrity* not compiled in!"); | |
21adbd5c SB |
782 | ret = -EINVAL; |
783 | goto out; | |
784 | #endif | |
8c342930 JM |
785 | case Opt_fatal_errors: |
786 | if (strcmp(args[0].from, "panic") == 0) | |
787 | btrfs_set_opt(info->mount_opt, | |
788 | PANIC_ON_FATAL_ERROR); | |
789 | else if (strcmp(args[0].from, "bug") == 0) | |
790 | btrfs_clear_opt(info->mount_opt, | |
791 | PANIC_ON_FATAL_ERROR); | |
792 | else { | |
793 | ret = -EINVAL; | |
794 | goto out; | |
795 | } | |
796 | break; | |
8b87dc17 DS |
797 | case Opt_commit_interval: |
798 | intarg = 0; | |
799 | ret = match_int(&args[0], &intarg); | |
800 | if (ret < 0) { | |
5d163e0e JM |
801 | btrfs_err(root->fs_info, |
802 | "invalid commit interval"); | |
8b87dc17 DS |
803 | ret = -EINVAL; |
804 | goto out; | |
805 | } | |
806 | if (intarg > 0) { | |
807 | if (intarg > 300) { | |
5d163e0e JM |
808 | btrfs_warn(root->fs_info, |
809 | "excessive commit interval %d", | |
810 | intarg); | |
8b87dc17 DS |
811 | } |
812 | info->commit_interval = intarg; | |
813 | } else { | |
5d163e0e JM |
814 | btrfs_info(root->fs_info, |
815 | "using default commit interval %ds", | |
816 | BTRFS_DEFAULT_COMMIT_INTERVAL); | |
8b87dc17 DS |
817 | info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; |
818 | } | |
819 | break; | |
d0bd4560 JB |
820 | #ifdef CONFIG_BTRFS_DEBUG |
821 | case Opt_fragment_all: | |
822 | btrfs_info(root->fs_info, "fragmenting all space"); | |
823 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); | |
824 | btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); | |
825 | break; | |
826 | case Opt_fragment_metadata: | |
827 | btrfs_info(root->fs_info, "fragmenting metadata"); | |
828 | btrfs_set_opt(info->mount_opt, | |
829 | FRAGMENT_METADATA); | |
830 | break; | |
831 | case Opt_fragment_data: | |
832 | btrfs_info(root->fs_info, "fragmenting data"); | |
833 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); | |
834 | break; | |
835 | #endif | |
a7a3f7ca | 836 | case Opt_err: |
5d163e0e JM |
837 | btrfs_info(root->fs_info, |
838 | "unrecognized mount option '%s'", p); | |
a7a3f7ca SW |
839 | ret = -EINVAL; |
840 | goto out; | |
95e05289 | 841 | default: |
be20aa9d | 842 | break; |
95e05289 CM |
843 | } |
844 | } | |
96da0919 QW |
845 | check: |
846 | /* | |
847 | * Extra check for current option against current flag | |
848 | */ | |
3cdde224 | 849 | if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & MS_RDONLY)) { |
96da0919 QW |
850 | btrfs_err(root->fs_info, |
851 | "nologreplay must be used with ro mount option"); | |
852 | ret = -EINVAL; | |
853 | } | |
a7a3f7ca | 854 | out: |
70f6d82e | 855 | if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) && |
3cdde224 JM |
856 | !btrfs_test_opt(info, FREE_SPACE_TREE) && |
857 | !btrfs_test_opt(info, CLEAR_CACHE)) { | |
70f6d82e OS |
858 | btrfs_err(root->fs_info, "cannot disable free space tree"); |
859 | ret = -EINVAL; | |
860 | ||
861 | } | |
3cdde224 | 862 | if (!ret && btrfs_test_opt(info, SPACE_CACHE)) |
efe120a0 | 863 | btrfs_info(root->fs_info, "disk space caching is enabled"); |
3cdde224 | 864 | if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) |
70f6d82e | 865 | btrfs_info(root->fs_info, "using free space tree"); |
da495ecc | 866 | kfree(orig); |
a7a3f7ca | 867 | return ret; |
edf24abe CH |
868 | } |
869 | ||
870 | /* | |
871 | * Parse mount options that are required early in the mount process. | |
872 | * | |
873 | * All other options will be parsed on much later in the mount process and | |
874 | * only when we need to allocate a new super block. | |
875 | */ | |
97288f2c | 876 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 877 | void *holder, char **subvol_name, u64 *subvol_objectid, |
5e2a4b25 | 878 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
879 | { |
880 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 881 | char *device_name, *opts, *orig, *p; |
1493381f | 882 | char *num = NULL; |
edf24abe CH |
883 | int error = 0; |
884 | ||
885 | if (!options) | |
830c4adb | 886 | return 0; |
edf24abe CH |
887 | |
888 | /* | |
889 | * strsep changes the string, duplicate it because parse_options | |
890 | * gets called twice | |
891 | */ | |
892 | opts = kstrdup(options, GFP_KERNEL); | |
893 | if (!opts) | |
894 | return -ENOMEM; | |
3f3d0bc0 | 895 | orig = opts; |
edf24abe CH |
896 | |
897 | while ((p = strsep(&opts, ",")) != NULL) { | |
898 | int token; | |
899 | if (!*p) | |
900 | continue; | |
901 | ||
902 | token = match_token(p, tokens, args); | |
903 | switch (token) { | |
904 | case Opt_subvol: | |
a90e8b6f | 905 | kfree(*subvol_name); |
edf24abe | 906 | *subvol_name = match_strdup(&args[0]); |
2c334e87 WS |
907 | if (!*subvol_name) { |
908 | error = -ENOMEM; | |
909 | goto out; | |
910 | } | |
edf24abe | 911 | break; |
73f73415 | 912 | case Opt_subvolid: |
1493381f WS |
913 | num = match_strdup(&args[0]); |
914 | if (num) { | |
915 | *subvol_objectid = memparse(num, NULL); | |
916 | kfree(num); | |
4849f01d | 917 | /* we want the original fs_tree */ |
1493381f | 918 | if (!*subvol_objectid) |
4849f01d JB |
919 | *subvol_objectid = |
920 | BTRFS_FS_TREE_OBJECTID; | |
2c334e87 WS |
921 | } else { |
922 | error = -EINVAL; | |
923 | goto out; | |
4849f01d | 924 | } |
73f73415 | 925 | break; |
e15d0542 | 926 | case Opt_subvolrootid: |
62e85577 | 927 | pr_warn("BTRFS: 'subvolrootid' mount option is deprecated and has no effect\n"); |
e15d0542 | 928 | break; |
43e570b0 | 929 | case Opt_device: |
83c8c9bd JL |
930 | device_name = match_strdup(&args[0]); |
931 | if (!device_name) { | |
932 | error = -ENOMEM; | |
933 | goto out; | |
934 | } | |
935 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 936 | flags, holder, fs_devices); |
83c8c9bd | 937 | kfree(device_name); |
43e570b0 | 938 | if (error) |
830c4adb | 939 | goto out; |
43e570b0 | 940 | break; |
edf24abe CH |
941 | default: |
942 | break; | |
943 | } | |
944 | } | |
945 | ||
830c4adb | 946 | out: |
3f3d0bc0 | 947 | kfree(orig); |
edf24abe | 948 | return error; |
95e05289 CM |
949 | } |
950 | ||
05dbe683 OS |
951 | static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, |
952 | u64 subvol_objectid) | |
73f73415 | 953 | { |
815745cf | 954 | struct btrfs_root *root = fs_info->tree_root; |
05dbe683 OS |
955 | struct btrfs_root *fs_root; |
956 | struct btrfs_root_ref *root_ref; | |
957 | struct btrfs_inode_ref *inode_ref; | |
958 | struct btrfs_key key; | |
959 | struct btrfs_path *path = NULL; | |
960 | char *name = NULL, *ptr; | |
961 | u64 dirid; | |
962 | int len; | |
963 | int ret; | |
964 | ||
965 | path = btrfs_alloc_path(); | |
966 | if (!path) { | |
967 | ret = -ENOMEM; | |
968 | goto err; | |
969 | } | |
970 | path->leave_spinning = 1; | |
971 | ||
972 | name = kmalloc(PATH_MAX, GFP_NOFS); | |
973 | if (!name) { | |
974 | ret = -ENOMEM; | |
975 | goto err; | |
976 | } | |
977 | ptr = name + PATH_MAX - 1; | |
978 | ptr[0] = '\0'; | |
73f73415 JB |
979 | |
980 | /* | |
05dbe683 OS |
981 | * Walk up the subvolume trees in the tree of tree roots by root |
982 | * backrefs until we hit the top-level subvolume. | |
73f73415 | 983 | */ |
05dbe683 OS |
984 | while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
985 | key.objectid = subvol_objectid; | |
986 | key.type = BTRFS_ROOT_BACKREF_KEY; | |
987 | key.offset = (u64)-1; | |
988 | ||
989 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
990 | if (ret < 0) { | |
991 | goto err; | |
992 | } else if (ret > 0) { | |
993 | ret = btrfs_previous_item(root, path, subvol_objectid, | |
994 | BTRFS_ROOT_BACKREF_KEY); | |
995 | if (ret < 0) { | |
996 | goto err; | |
997 | } else if (ret > 0) { | |
998 | ret = -ENOENT; | |
999 | goto err; | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1004 | subvol_objectid = key.offset; | |
1005 | ||
1006 | root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1007 | struct btrfs_root_ref); | |
1008 | len = btrfs_root_ref_name_len(path->nodes[0], root_ref); | |
1009 | ptr -= len + 1; | |
1010 | if (ptr < name) { | |
1011 | ret = -ENAMETOOLONG; | |
1012 | goto err; | |
1013 | } | |
1014 | read_extent_buffer(path->nodes[0], ptr + 1, | |
1015 | (unsigned long)(root_ref + 1), len); | |
1016 | ptr[0] = '/'; | |
1017 | dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); | |
1018 | btrfs_release_path(path); | |
1019 | ||
1020 | key.objectid = subvol_objectid; | |
1021 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1022 | key.offset = (u64)-1; | |
1023 | fs_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
1024 | if (IS_ERR(fs_root)) { | |
1025 | ret = PTR_ERR(fs_root); | |
1026 | goto err; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Walk up the filesystem tree by inode refs until we hit the | |
1031 | * root directory. | |
1032 | */ | |
1033 | while (dirid != BTRFS_FIRST_FREE_OBJECTID) { | |
1034 | key.objectid = dirid; | |
1035 | key.type = BTRFS_INODE_REF_KEY; | |
1036 | key.offset = (u64)-1; | |
1037 | ||
1038 | ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); | |
1039 | if (ret < 0) { | |
1040 | goto err; | |
1041 | } else if (ret > 0) { | |
1042 | ret = btrfs_previous_item(fs_root, path, dirid, | |
1043 | BTRFS_INODE_REF_KEY); | |
1044 | if (ret < 0) { | |
1045 | goto err; | |
1046 | } else if (ret > 0) { | |
1047 | ret = -ENOENT; | |
1048 | goto err; | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1053 | dirid = key.offset; | |
1054 | ||
1055 | inode_ref = btrfs_item_ptr(path->nodes[0], | |
1056 | path->slots[0], | |
1057 | struct btrfs_inode_ref); | |
1058 | len = btrfs_inode_ref_name_len(path->nodes[0], | |
1059 | inode_ref); | |
1060 | ptr -= len + 1; | |
1061 | if (ptr < name) { | |
1062 | ret = -ENAMETOOLONG; | |
1063 | goto err; | |
1064 | } | |
1065 | read_extent_buffer(path->nodes[0], ptr + 1, | |
1066 | (unsigned long)(inode_ref + 1), len); | |
1067 | ptr[0] = '/'; | |
1068 | btrfs_release_path(path); | |
1069 | } | |
73f73415 JB |
1070 | } |
1071 | ||
05dbe683 OS |
1072 | btrfs_free_path(path); |
1073 | if (ptr == name + PATH_MAX - 1) { | |
1074 | name[0] = '/'; | |
1075 | name[1] = '\0'; | |
1076 | } else { | |
1077 | memmove(name, ptr, name + PATH_MAX - ptr); | |
1078 | } | |
1079 | return name; | |
1080 | ||
1081 | err: | |
1082 | btrfs_free_path(path); | |
1083 | kfree(name); | |
1084 | return ERR_PTR(ret); | |
1085 | } | |
1086 | ||
1087 | static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) | |
1088 | { | |
1089 | struct btrfs_root *root = fs_info->tree_root; | |
1090 | struct btrfs_dir_item *di; | |
1091 | struct btrfs_path *path; | |
1092 | struct btrfs_key location; | |
1093 | u64 dir_id; | |
1094 | ||
73f73415 JB |
1095 | path = btrfs_alloc_path(); |
1096 | if (!path) | |
05dbe683 | 1097 | return -ENOMEM; |
73f73415 JB |
1098 | path->leave_spinning = 1; |
1099 | ||
1100 | /* | |
1101 | * Find the "default" dir item which points to the root item that we | |
1102 | * will mount by default if we haven't been given a specific subvolume | |
1103 | * to mount. | |
1104 | */ | |
815745cf | 1105 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 1106 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
1107 | if (IS_ERR(di)) { |
1108 | btrfs_free_path(path); | |
05dbe683 | 1109 | return PTR_ERR(di); |
b0839166 | 1110 | } |
73f73415 JB |
1111 | if (!di) { |
1112 | /* | |
1113 | * Ok the default dir item isn't there. This is weird since | |
1114 | * it's always been there, but don't freak out, just try and | |
05dbe683 | 1115 | * mount the top-level subvolume. |
73f73415 JB |
1116 | */ |
1117 | btrfs_free_path(path); | |
05dbe683 OS |
1118 | *objectid = BTRFS_FS_TREE_OBJECTID; |
1119 | return 0; | |
73f73415 JB |
1120 | } |
1121 | ||
1122 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
1123 | btrfs_free_path(path); | |
05dbe683 OS |
1124 | *objectid = location.objectid; |
1125 | return 0; | |
73f73415 JB |
1126 | } |
1127 | ||
d397712b | 1128 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 1129 | struct btrfs_fs_devices *fs_devices, |
d397712b | 1130 | void *data, int silent) |
75dfe396 | 1131 | { |
d397712b | 1132 | struct inode *inode; |
815745cf | 1133 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 1134 | struct btrfs_key key; |
39279cc3 | 1135 | int err; |
a429e513 | 1136 | |
39279cc3 CM |
1137 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
1138 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
1139 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 1140 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 1141 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 1142 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 1143 | sb->s_time_gran = 1; |
0eda294d | 1144 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 1145 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 1146 | #endif |
0c4d2d95 | 1147 | sb->s_flags |= MS_I_VERSION; |
da2f0f74 | 1148 | sb->s_iflags |= SB_I_CGROUPWB; |
ad2b2c80 AV |
1149 | err = open_ctree(sb, fs_devices, (char *)data); |
1150 | if (err) { | |
ab8d0fc4 | 1151 | btrfs_err(fs_info, "open_ctree failed"); |
ad2b2c80 | 1152 | return err; |
a429e513 CM |
1153 | } |
1154 | ||
5d4f98a2 YZ |
1155 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
1156 | key.type = BTRFS_INODE_ITEM_KEY; | |
1157 | key.offset = 0; | |
98c7089c | 1158 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
1159 | if (IS_ERR(inode)) { |
1160 | err = PTR_ERR(inode); | |
39279cc3 | 1161 | goto fail_close; |
f254e52c | 1162 | } |
f254e52c | 1163 | |
48fde701 AV |
1164 | sb->s_root = d_make_root(inode); |
1165 | if (!sb->s_root) { | |
39279cc3 CM |
1166 | err = -ENOMEM; |
1167 | goto fail_close; | |
f254e52c | 1168 | } |
58176a96 | 1169 | |
6885f308 | 1170 | save_mount_options(sb, data); |
90a887c9 | 1171 | cleancache_init_fs(sb); |
59553edf | 1172 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 1173 | return 0; |
39279cc3 CM |
1174 | |
1175 | fail_close: | |
815745cf | 1176 | close_ctree(fs_info->tree_root); |
39279cc3 | 1177 | return err; |
2619ba1f CM |
1178 | } |
1179 | ||
6bf13c0c | 1180 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
1181 | { |
1182 | struct btrfs_trans_handle *trans; | |
815745cf AV |
1183 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1184 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 1185 | |
bc074524 | 1186 | trace_btrfs_sync_fs(fs_info, wait); |
1abe9b8a | 1187 | |
39279cc3 | 1188 | if (!wait) { |
815745cf | 1189 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
1190 | return 0; |
1191 | } | |
771ed689 | 1192 | |
578def7c | 1193 | btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); |
771ed689 | 1194 | |
d4edf39b | 1195 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 1196 | if (IS_ERR(trans)) { |
354aa0fb | 1197 | /* no transaction, don't bother */ |
6b5fe46d DS |
1198 | if (PTR_ERR(trans) == -ENOENT) { |
1199 | /* | |
1200 | * Exit unless we have some pending changes | |
1201 | * that need to go through commit | |
1202 | */ | |
1203 | if (fs_info->pending_changes == 0) | |
1204 | return 0; | |
a53f4f8e QW |
1205 | /* |
1206 | * A non-blocking test if the fs is frozen. We must not | |
1207 | * start a new transaction here otherwise a deadlock | |
1208 | * happens. The pending operations are delayed to the | |
1209 | * next commit after thawing. | |
1210 | */ | |
1211 | if (__sb_start_write(sb, SB_FREEZE_WRITE, false)) | |
1212 | __sb_end_write(sb, SB_FREEZE_WRITE); | |
1213 | else | |
1214 | return 0; | |
6b5fe46d | 1215 | trans = btrfs_start_transaction(root, 0); |
6b5fe46d | 1216 | } |
98bd5c54 DS |
1217 | if (IS_ERR(trans)) |
1218 | return PTR_ERR(trans); | |
60376ce4 | 1219 | } |
bd7de2c9 | 1220 | return btrfs_commit_transaction(trans, root); |
2c90e5d6 CM |
1221 | } |
1222 | ||
34c80b1d | 1223 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 1224 | { |
815745cf AV |
1225 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
1226 | struct btrfs_root *root = info->tree_root; | |
200da64e | 1227 | char *compress_type; |
a9572a15 | 1228 | |
3cdde224 | 1229 | if (btrfs_test_opt(info, DEGRADED)) |
a9572a15 | 1230 | seq_puts(seq, ",degraded"); |
3cdde224 | 1231 | if (btrfs_test_opt(info, NODATASUM)) |
a9572a15 | 1232 | seq_puts(seq, ",nodatasum"); |
3cdde224 | 1233 | if (btrfs_test_opt(info, NODATACOW)) |
a9572a15 | 1234 | seq_puts(seq, ",nodatacow"); |
3cdde224 | 1235 | if (btrfs_test_opt(info, NOBARRIER)) |
a9572a15 | 1236 | seq_puts(seq, ",nobarrier"); |
95ac567a | 1237 | if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) |
c1c9ff7c | 1238 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
a9572a15 | 1239 | if (info->alloc_start != 0) |
c1c9ff7c | 1240 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); |
a9572a15 EP |
1241 | if (info->thread_pool_size != min_t(unsigned long, |
1242 | num_online_cpus() + 2, 8)) | |
1243 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
3cdde224 | 1244 | if (btrfs_test_opt(info, COMPRESS)) { |
200da64e TI |
1245 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) |
1246 | compress_type = "zlib"; | |
1247 | else | |
1248 | compress_type = "lzo"; | |
3cdde224 | 1249 | if (btrfs_test_opt(info, FORCE_COMPRESS)) |
200da64e TI |
1250 | seq_printf(seq, ",compress-force=%s", compress_type); |
1251 | else | |
1252 | seq_printf(seq, ",compress=%s", compress_type); | |
1253 | } | |
3cdde224 | 1254 | if (btrfs_test_opt(info, NOSSD)) |
c289811c | 1255 | seq_puts(seq, ",nossd"); |
3cdde224 | 1256 | if (btrfs_test_opt(info, SSD_SPREAD)) |
451d7585 | 1257 | seq_puts(seq, ",ssd_spread"); |
3cdde224 | 1258 | else if (btrfs_test_opt(info, SSD)) |
a9572a15 | 1259 | seq_puts(seq, ",ssd"); |
3cdde224 | 1260 | if (btrfs_test_opt(info, NOTREELOG)) |
6b65c5c6 | 1261 | seq_puts(seq, ",notreelog"); |
3cdde224 | 1262 | if (btrfs_test_opt(info, NOLOGREPLAY)) |
96da0919 | 1263 | seq_puts(seq, ",nologreplay"); |
3cdde224 | 1264 | if (btrfs_test_opt(info, FLUSHONCOMMIT)) |
6b65c5c6 | 1265 | seq_puts(seq, ",flushoncommit"); |
3cdde224 | 1266 | if (btrfs_test_opt(info, DISCARD)) |
20a5239a | 1267 | seq_puts(seq, ",discard"); |
a9572a15 EP |
1268 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
1269 | seq_puts(seq, ",noacl"); | |
3cdde224 | 1270 | if (btrfs_test_opt(info, SPACE_CACHE)) |
200da64e | 1271 | seq_puts(seq, ",space_cache"); |
3cdde224 | 1272 | else if (btrfs_test_opt(info, FREE_SPACE_TREE)) |
70f6d82e | 1273 | seq_puts(seq, ",space_cache=v2"); |
73bc1876 | 1274 | else |
8965593e | 1275 | seq_puts(seq, ",nospace_cache"); |
3cdde224 | 1276 | if (btrfs_test_opt(info, RESCAN_UUID_TREE)) |
f420ee1e | 1277 | seq_puts(seq, ",rescan_uuid_tree"); |
3cdde224 | 1278 | if (btrfs_test_opt(info, CLEAR_CACHE)) |
200da64e | 1279 | seq_puts(seq, ",clear_cache"); |
3cdde224 | 1280 | if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) |
200da64e | 1281 | seq_puts(seq, ",user_subvol_rm_allowed"); |
3cdde224 | 1282 | if (btrfs_test_opt(info, ENOSPC_DEBUG)) |
0942caa3 | 1283 | seq_puts(seq, ",enospc_debug"); |
3cdde224 | 1284 | if (btrfs_test_opt(info, AUTO_DEFRAG)) |
0942caa3 | 1285 | seq_puts(seq, ",autodefrag"); |
3cdde224 | 1286 | if (btrfs_test_opt(info, INODE_MAP_CACHE)) |
0942caa3 | 1287 | seq_puts(seq, ",inode_cache"); |
3cdde224 | 1288 | if (btrfs_test_opt(info, SKIP_BALANCE)) |
9555c6c1 | 1289 | seq_puts(seq, ",skip_balance"); |
8507d216 | 1290 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
3cdde224 | 1291 | if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) |
8507d216 | 1292 | seq_puts(seq, ",check_int_data"); |
3cdde224 | 1293 | else if (btrfs_test_opt(info, CHECK_INTEGRITY)) |
8507d216 WS |
1294 | seq_puts(seq, ",check_int"); |
1295 | if (info->check_integrity_print_mask) | |
1296 | seq_printf(seq, ",check_int_print_mask=%d", | |
1297 | info->check_integrity_print_mask); | |
1298 | #endif | |
1299 | if (info->metadata_ratio) | |
1300 | seq_printf(seq, ",metadata_ratio=%d", | |
1301 | info->metadata_ratio); | |
3cdde224 | 1302 | if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) |
8c342930 | 1303 | seq_puts(seq, ",fatal_errors=panic"); |
8b87dc17 DS |
1304 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
1305 | seq_printf(seq, ",commit=%d", info->commit_interval); | |
d0bd4560 | 1306 | #ifdef CONFIG_BTRFS_DEBUG |
3cdde224 | 1307 | if (btrfs_test_opt(info, FRAGMENT_DATA)) |
d0bd4560 | 1308 | seq_puts(seq, ",fragment=data"); |
3cdde224 | 1309 | if (btrfs_test_opt(info, FRAGMENT_METADATA)) |
d0bd4560 JB |
1310 | seq_puts(seq, ",fragment=metadata"); |
1311 | #endif | |
c8d3fe02 OS |
1312 | seq_printf(seq, ",subvolid=%llu", |
1313 | BTRFS_I(d_inode(dentry))->root->root_key.objectid); | |
1314 | seq_puts(seq, ",subvol="); | |
1315 | seq_dentry(seq, dentry, " \t\n\\"); | |
a9572a15 EP |
1316 | return 0; |
1317 | } | |
1318 | ||
a061fc8d | 1319 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 1320 | { |
815745cf AV |
1321 | struct btrfs_fs_info *p = data; |
1322 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 1323 | |
815745cf | 1324 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
1325 | } |
1326 | ||
450ba0ea JB |
1327 | static int btrfs_set_super(struct super_block *s, void *data) |
1328 | { | |
6de1d09d AV |
1329 | int err = set_anon_super(s, data); |
1330 | if (!err) | |
1331 | s->s_fs_info = data; | |
1332 | return err; | |
4b82d6e4 Y |
1333 | } |
1334 | ||
f9d9ef62 DS |
1335 | /* |
1336 | * subvolumes are identified by ino 256 | |
1337 | */ | |
1338 | static inline int is_subvolume_inode(struct inode *inode) | |
1339 | { | |
1340 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1341 | return 1; | |
1342 | return 0; | |
1343 | } | |
1344 | ||
830c4adb | 1345 | /* |
e6e4dbe8 OS |
1346 | * This will add subvolid=0 to the argument string while removing any subvol= |
1347 | * and subvolid= arguments to make sure we get the top-level root for path | |
1348 | * walking to the subvol we want. | |
830c4adb JB |
1349 | */ |
1350 | static char *setup_root_args(char *args) | |
1351 | { | |
e6e4dbe8 | 1352 | char *buf, *dst, *sep; |
830c4adb | 1353 | |
e6e4dbe8 OS |
1354 | if (!args) |
1355 | return kstrdup("subvolid=0", GFP_NOFS); | |
f60d16a8 | 1356 | |
e6e4dbe8 OS |
1357 | /* The worst case is that we add ",subvolid=0" to the end. */ |
1358 | buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS); | |
f60d16a8 | 1359 | if (!buf) |
830c4adb | 1360 | return NULL; |
830c4adb | 1361 | |
e6e4dbe8 OS |
1362 | while (1) { |
1363 | sep = strchrnul(args, ','); | |
1364 | if (!strstarts(args, "subvol=") && | |
1365 | !strstarts(args, "subvolid=")) { | |
1366 | memcpy(dst, args, sep - args); | |
1367 | dst += sep - args; | |
1368 | *dst++ = ','; | |
1369 | } | |
1370 | if (*sep) | |
1371 | args = sep + 1; | |
1372 | else | |
1373 | break; | |
830c4adb | 1374 | } |
f60d16a8 | 1375 | strcpy(dst, "subvolid=0"); |
830c4adb | 1376 | |
f60d16a8 | 1377 | return buf; |
830c4adb JB |
1378 | } |
1379 | ||
bb289b7b OS |
1380 | static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, |
1381 | int flags, const char *device_name, | |
1382 | char *data) | |
830c4adb | 1383 | { |
830c4adb | 1384 | struct dentry *root; |
fa330659 | 1385 | struct vfsmount *mnt = NULL; |
830c4adb | 1386 | char *newargs; |
fa330659 | 1387 | int ret; |
830c4adb JB |
1388 | |
1389 | newargs = setup_root_args(data); | |
fa330659 OS |
1390 | if (!newargs) { |
1391 | root = ERR_PTR(-ENOMEM); | |
1392 | goto out; | |
1393 | } | |
0723a047 | 1394 | |
fa330659 OS |
1395 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); |
1396 | if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { | |
0723a047 | 1397 | if (flags & MS_RDONLY) { |
fa330659 OS |
1398 | mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, |
1399 | device_name, newargs); | |
0723a047 | 1400 | } else { |
fa330659 OS |
1401 | mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, |
1402 | device_name, newargs); | |
0040e606 | 1403 | if (IS_ERR(mnt)) { |
fa330659 OS |
1404 | root = ERR_CAST(mnt); |
1405 | mnt = NULL; | |
1406 | goto out; | |
0040e606 | 1407 | } |
0723a047 | 1408 | |
773cd04e | 1409 | down_write(&mnt->mnt_sb->s_umount); |
fa330659 | 1410 | ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); |
773cd04e | 1411 | up_write(&mnt->mnt_sb->s_umount); |
fa330659 OS |
1412 | if (ret < 0) { |
1413 | root = ERR_PTR(ret); | |
1414 | goto out; | |
0723a047 HH |
1415 | } |
1416 | } | |
1417 | } | |
fa330659 OS |
1418 | if (IS_ERR(mnt)) { |
1419 | root = ERR_CAST(mnt); | |
1420 | mnt = NULL; | |
1421 | goto out; | |
1422 | } | |
830c4adb | 1423 | |
05dbe683 OS |
1424 | if (!subvol_name) { |
1425 | if (!subvol_objectid) { | |
1426 | ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), | |
1427 | &subvol_objectid); | |
1428 | if (ret) { | |
1429 | root = ERR_PTR(ret); | |
1430 | goto out; | |
1431 | } | |
1432 | } | |
1433 | subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), | |
1434 | subvol_objectid); | |
1435 | if (IS_ERR(subvol_name)) { | |
1436 | root = ERR_CAST(subvol_name); | |
1437 | subvol_name = NULL; | |
1438 | goto out; | |
1439 | } | |
1440 | ||
1441 | } | |
1442 | ||
ea441d11 | 1443 | root = mount_subtree(mnt, subvol_name); |
fa330659 OS |
1444 | /* mount_subtree() drops our reference on the vfsmount. */ |
1445 | mnt = NULL; | |
830c4adb | 1446 | |
bb289b7b | 1447 | if (!IS_ERR(root)) { |
ea441d11 | 1448 | struct super_block *s = root->d_sb; |
ab8d0fc4 | 1449 | struct btrfs_fs_info *fs_info = btrfs_sb(s); |
bb289b7b OS |
1450 | struct inode *root_inode = d_inode(root); |
1451 | u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; | |
1452 | ||
1453 | ret = 0; | |
1454 | if (!is_subvolume_inode(root_inode)) { | |
ab8d0fc4 | 1455 | btrfs_err(fs_info, "'%s' is not a valid subvolume", |
bb289b7b OS |
1456 | subvol_name); |
1457 | ret = -EINVAL; | |
1458 | } | |
1459 | if (subvol_objectid && root_objectid != subvol_objectid) { | |
05dbe683 OS |
1460 | /* |
1461 | * This will also catch a race condition where a | |
1462 | * subvolume which was passed by ID is renamed and | |
1463 | * another subvolume is renamed over the old location. | |
1464 | */ | |
ab8d0fc4 JM |
1465 | btrfs_err(fs_info, |
1466 | "subvol '%s' does not match subvolid %llu", | |
1467 | subvol_name, subvol_objectid); | |
bb289b7b OS |
1468 | ret = -EINVAL; |
1469 | } | |
1470 | if (ret) { | |
1471 | dput(root); | |
1472 | root = ERR_PTR(ret); | |
1473 | deactivate_locked_super(s); | |
1474 | } | |
f9d9ef62 DS |
1475 | } |
1476 | ||
fa330659 OS |
1477 | out: |
1478 | mntput(mnt); | |
1479 | kfree(newargs); | |
1480 | kfree(subvol_name); | |
830c4adb JB |
1481 | return root; |
1482 | } | |
450ba0ea | 1483 | |
f667aef6 QW |
1484 | static int parse_security_options(char *orig_opts, |
1485 | struct security_mnt_opts *sec_opts) | |
1486 | { | |
1487 | char *secdata = NULL; | |
1488 | int ret = 0; | |
1489 | ||
1490 | secdata = alloc_secdata(); | |
1491 | if (!secdata) | |
1492 | return -ENOMEM; | |
1493 | ret = security_sb_copy_data(orig_opts, secdata); | |
1494 | if (ret) { | |
1495 | free_secdata(secdata); | |
1496 | return ret; | |
1497 | } | |
1498 | ret = security_sb_parse_opts_str(secdata, sec_opts); | |
1499 | free_secdata(secdata); | |
1500 | return ret; | |
1501 | } | |
1502 | ||
1503 | static int setup_security_options(struct btrfs_fs_info *fs_info, | |
1504 | struct super_block *sb, | |
1505 | struct security_mnt_opts *sec_opts) | |
1506 | { | |
1507 | int ret = 0; | |
1508 | ||
1509 | /* | |
1510 | * Call security_sb_set_mnt_opts() to check whether new sec_opts | |
1511 | * is valid. | |
1512 | */ | |
1513 | ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); | |
1514 | if (ret) | |
1515 | return ret; | |
1516 | ||
a43bb39b | 1517 | #ifdef CONFIG_SECURITY |
f667aef6 QW |
1518 | if (!fs_info->security_opts.num_mnt_opts) { |
1519 | /* first time security setup, copy sec_opts to fs_info */ | |
1520 | memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); | |
1521 | } else { | |
1522 | /* | |
180e4d47 LB |
1523 | * Since SELinux (the only one supporting security_mnt_opts) |
1524 | * does NOT support changing context during remount/mount of | |
1525 | * the same sb, this must be the same or part of the same | |
1526 | * security options, just free it. | |
f667aef6 QW |
1527 | */ |
1528 | security_free_mnt_opts(sec_opts); | |
1529 | } | |
a43bb39b | 1530 | #endif |
f667aef6 QW |
1531 | return ret; |
1532 | } | |
1533 | ||
edf24abe CH |
1534 | /* |
1535 | * Find a superblock for the given device / mount point. | |
1536 | * | |
1537 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1538 | * for multiple device setup. Make sure to keep it in sync. | |
1539 | */ | |
061dbc6b | 1540 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1541 | const char *device_name, void *data) |
4b82d6e4 Y |
1542 | { |
1543 | struct block_device *bdev = NULL; | |
1544 | struct super_block *s; | |
8a4b83cc | 1545 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 1546 | struct btrfs_fs_info *fs_info = NULL; |
f667aef6 | 1547 | struct security_mnt_opts new_sec_opts; |
97288f2c | 1548 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1549 | char *subvol_name = NULL; |
1550 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
1551 | int error = 0; |
1552 | ||
97288f2c CH |
1553 | if (!(flags & MS_RDONLY)) |
1554 | mode |= FMODE_WRITE; | |
1555 | ||
1556 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 1557 | &subvol_name, &subvol_objectid, |
5e2a4b25 | 1558 | &fs_devices); |
f23c8af8 ID |
1559 | if (error) { |
1560 | kfree(subvol_name); | |
061dbc6b | 1561 | return ERR_PTR(error); |
f23c8af8 | 1562 | } |
edf24abe | 1563 | |
05dbe683 | 1564 | if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
fa330659 | 1565 | /* mount_subvol() will free subvol_name. */ |
bb289b7b OS |
1566 | return mount_subvol(subvol_name, subvol_objectid, flags, |
1567 | device_name, data); | |
830c4adb JB |
1568 | } |
1569 | ||
f667aef6 QW |
1570 | security_init_mnt_opts(&new_sec_opts); |
1571 | if (data) { | |
1572 | error = parse_security_options(data, &new_sec_opts); | |
1573 | if (error) | |
1574 | return ERR_PTR(error); | |
1575 | } | |
1576 | ||
306e16ce | 1577 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 1578 | if (error) |
f667aef6 | 1579 | goto error_sec_opts; |
4b82d6e4 | 1580 | |
450ba0ea JB |
1581 | /* |
1582 | * Setup a dummy root and fs_info for test/set super. This is because | |
1583 | * we don't actually fill this stuff out until open_ctree, but we need | |
1584 | * it for searching for existing supers, so this lets us do that and | |
1585 | * then open_ctree will properly initialize everything later. | |
1586 | */ | |
1587 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
f667aef6 QW |
1588 | if (!fs_info) { |
1589 | error = -ENOMEM; | |
1590 | goto error_sec_opts; | |
1591 | } | |
04d21a24 | 1592 | |
450ba0ea | 1593 | fs_info->fs_devices = fs_devices; |
450ba0ea | 1594 | |
6c41761f DS |
1595 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
1596 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
f667aef6 | 1597 | security_init_mnt_opts(&fs_info->security_opts); |
6c41761f DS |
1598 | if (!fs_info->super_copy || !fs_info->super_for_commit) { |
1599 | error = -ENOMEM; | |
04d21a24 ID |
1600 | goto error_fs_info; |
1601 | } | |
1602 | ||
1603 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1604 | if (error) | |
1605 | goto error_fs_info; | |
1606 | ||
1607 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1608 | error = -EACCES; | |
6c41761f DS |
1609 | goto error_close_devices; |
1610 | } | |
1611 | ||
dfe25020 | 1612 | bdev = fs_devices->latest_bdev; |
9249e17f DH |
1613 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
1614 | fs_info); | |
830c4adb JB |
1615 | if (IS_ERR(s)) { |
1616 | error = PTR_ERR(s); | |
1617 | goto error_close_devices; | |
1618 | } | |
4b82d6e4 Y |
1619 | |
1620 | if (s->s_root) { | |
2b82032c | 1621 | btrfs_close_devices(fs_devices); |
6c41761f | 1622 | free_fs_info(fs_info); |
59553edf AV |
1623 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1624 | error = -EBUSY; | |
4b82d6e4 | 1625 | } else { |
a1c6f057 | 1626 | snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); |
815745cf | 1627 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1628 | error = btrfs_fill_super(s, fs_devices, data, |
1629 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 1630 | } |
05dbe683 | 1631 | if (error) { |
f667aef6 | 1632 | deactivate_locked_super(s); |
f667aef6 QW |
1633 | goto error_sec_opts; |
1634 | } | |
1635 | ||
1636 | fs_info = btrfs_sb(s); | |
1637 | error = setup_security_options(fs_info, s, &new_sec_opts); | |
1638 | if (error) { | |
830c4adb | 1639 | deactivate_locked_super(s); |
f667aef6 QW |
1640 | goto error_sec_opts; |
1641 | } | |
4b82d6e4 | 1642 | |
05dbe683 | 1643 | return dget(s->s_root); |
4b82d6e4 | 1644 | |
c146afad | 1645 | error_close_devices: |
8a4b83cc | 1646 | btrfs_close_devices(fs_devices); |
04d21a24 | 1647 | error_fs_info: |
6c41761f | 1648 | free_fs_info(fs_info); |
f667aef6 QW |
1649 | error_sec_opts: |
1650 | security_free_mnt_opts(&new_sec_opts); | |
061dbc6b | 1651 | return ERR_PTR(error); |
4b82d6e4 | 1652 | } |
2e635a27 | 1653 | |
0d2450ab ST |
1654 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
1655 | int new_pool_size, int old_pool_size) | |
1656 | { | |
1657 | if (new_pool_size == old_pool_size) | |
1658 | return; | |
1659 | ||
1660 | fs_info->thread_pool_size = new_pool_size; | |
1661 | ||
efe120a0 | 1662 | btrfs_info(fs_info, "resize thread pool %d -> %d", |
0d2450ab ST |
1663 | old_pool_size, new_pool_size); |
1664 | ||
5cdc7ad3 | 1665 | btrfs_workqueue_set_max(fs_info->workers, new_pool_size); |
afe3d242 | 1666 | btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); |
a8c93d4e | 1667 | btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); |
e66f0bb1 | 1668 | btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); |
fccb5d86 QW |
1669 | btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); |
1670 | btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); | |
1671 | btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, | |
1672 | new_pool_size); | |
1673 | btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); | |
1674 | btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); | |
5b3bc44e | 1675 | btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); |
736cfa15 | 1676 | btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); |
0339ef2f QW |
1677 | btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, |
1678 | new_pool_size); | |
0d2450ab ST |
1679 | } |
1680 | ||
f42a34b2 | 1681 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
dc81cdc5 MX |
1682 | { |
1683 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
f42a34b2 | 1684 | } |
dc81cdc5 | 1685 | |
f42a34b2 MX |
1686 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
1687 | unsigned long old_opts, int flags) | |
1688 | { | |
dc81cdc5 MX |
1689 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1690 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1691 | (flags & MS_RDONLY))) { | |
1692 | /* wait for any defraggers to finish */ | |
1693 | wait_event(fs_info->transaction_wait, | |
1694 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1695 | if (flags & MS_RDONLY) | |
1696 | sync_filesystem(fs_info->sb); | |
1697 | } | |
1698 | } | |
1699 | ||
1700 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1701 | unsigned long old_opts) | |
1702 | { | |
1703 | /* | |
180e4d47 LB |
1704 | * We need to cleanup all defragable inodes if the autodefragment is |
1705 | * close or the filesystem is read only. | |
dc81cdc5 MX |
1706 | */ |
1707 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
1708 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1709 | (fs_info->sb->s_flags & MS_RDONLY))) { | |
1710 | btrfs_cleanup_defrag_inodes(fs_info); | |
1711 | } | |
1712 | ||
1713 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1714 | } | |
1715 | ||
c146afad YZ |
1716 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1717 | { | |
815745cf AV |
1718 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1719 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1720 | unsigned old_flags = sb->s_flags; |
1721 | unsigned long old_opts = fs_info->mount_opt; | |
1722 | unsigned long old_compress_type = fs_info->compress_type; | |
1723 | u64 old_max_inline = fs_info->max_inline; | |
1724 | u64 old_alloc_start = fs_info->alloc_start; | |
1725 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1726 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
c146afad YZ |
1727 | int ret; |
1728 | ||
02b9984d | 1729 | sync_filesystem(sb); |
f42a34b2 | 1730 | btrfs_remount_prepare(fs_info); |
dc81cdc5 | 1731 | |
f667aef6 QW |
1732 | if (data) { |
1733 | struct security_mnt_opts new_sec_opts; | |
1734 | ||
1735 | security_init_mnt_opts(&new_sec_opts); | |
1736 | ret = parse_security_options(data, &new_sec_opts); | |
1737 | if (ret) | |
1738 | goto restore; | |
1739 | ret = setup_security_options(fs_info, sb, | |
1740 | &new_sec_opts); | |
1741 | if (ret) { | |
1742 | security_free_mnt_opts(&new_sec_opts); | |
1743 | goto restore; | |
1744 | } | |
1745 | } | |
1746 | ||
96da0919 | 1747 | ret = btrfs_parse_options(root, data, *flags); |
49b25e05 JM |
1748 | if (ret) { |
1749 | ret = -EINVAL; | |
1750 | goto restore; | |
1751 | } | |
b288052e | 1752 | |
f42a34b2 | 1753 | btrfs_remount_begin(fs_info, old_opts, *flags); |
0d2450ab ST |
1754 | btrfs_resize_thread_pool(fs_info, |
1755 | fs_info->thread_pool_size, old_thread_pool_size); | |
1756 | ||
c146afad | 1757 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
dc81cdc5 | 1758 | goto out; |
c146afad YZ |
1759 | |
1760 | if (*flags & MS_RDONLY) { | |
8dabb742 SB |
1761 | /* |
1762 | * this also happens on 'umount -rf' or on shutdown, when | |
1763 | * the filesystem is busy. | |
1764 | */ | |
21c7e756 | 1765 | cancel_work_sync(&fs_info->async_reclaim_work); |
361c093d SB |
1766 | |
1767 | /* wait for the uuid_scan task to finish */ | |
1768 | down(&fs_info->uuid_tree_rescan_sem); | |
1769 | /* avoid complains from lockdep et al. */ | |
1770 | up(&fs_info->uuid_tree_rescan_sem); | |
1771 | ||
c146afad YZ |
1772 | sb->s_flags |= MS_RDONLY; |
1773 | ||
e44163e1 JM |
1774 | /* |
1775 | * Setting MS_RDONLY will put the cleaner thread to | |
1776 | * sleep at the next loop if it's already active. | |
1777 | * If it's already asleep, we'll leave unused block | |
1778 | * groups on disk until we're mounted read-write again | |
1779 | * unless we clean them up here. | |
1780 | */ | |
e44163e1 | 1781 | btrfs_delete_unused_bgs(fs_info); |
e44163e1 | 1782 | |
8dabb742 SB |
1783 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1784 | btrfs_scrub_cancel(fs_info); | |
061594ef | 1785 | btrfs_pause_balance(fs_info); |
8dabb742 | 1786 | |
49b25e05 JM |
1787 | ret = btrfs_commit_super(root); |
1788 | if (ret) | |
1789 | goto restore; | |
c146afad | 1790 | } else { |
6ef3de9c DS |
1791 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
1792 | btrfs_err(fs_info, | |
efe120a0 | 1793 | "Remounting read-write after error is not allowed"); |
6ef3de9c DS |
1794 | ret = -EINVAL; |
1795 | goto restore; | |
1796 | } | |
8a3db184 | 1797 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1798 | ret = -EACCES; |
1799 | goto restore; | |
8a3db184 | 1800 | } |
2b82032c | 1801 | |
292fd7fc SB |
1802 | if (fs_info->fs_devices->missing_devices > |
1803 | fs_info->num_tolerated_disk_barrier_failures && | |
1804 | !(*flags & MS_RDONLY)) { | |
efe120a0 FH |
1805 | btrfs_warn(fs_info, |
1806 | "too many missing devices, writeable remount is not allowed"); | |
292fd7fc SB |
1807 | ret = -EACCES; |
1808 | goto restore; | |
1809 | } | |
1810 | ||
8a3db184 | 1811 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1812 | ret = -EINVAL; |
1813 | goto restore; | |
8a3db184 | 1814 | } |
c146afad | 1815 | |
815745cf | 1816 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1817 | if (ret) |
1818 | goto restore; | |
c146afad | 1819 | |
d68fc57b | 1820 | /* recover relocation */ |
5f316481 | 1821 | mutex_lock(&fs_info->cleaner_mutex); |
d68fc57b | 1822 | ret = btrfs_recover_relocation(root); |
5f316481 | 1823 | mutex_unlock(&fs_info->cleaner_mutex); |
49b25e05 JM |
1824 | if (ret) |
1825 | goto restore; | |
c146afad | 1826 | |
2b6ba629 ID |
1827 | ret = btrfs_resume_balance_async(fs_info); |
1828 | if (ret) | |
1829 | goto restore; | |
1830 | ||
8dabb742 SB |
1831 | ret = btrfs_resume_dev_replace_async(fs_info); |
1832 | if (ret) { | |
efe120a0 | 1833 | btrfs_warn(fs_info, "failed to resume dev_replace"); |
8dabb742 SB |
1834 | goto restore; |
1835 | } | |
94aebfb2 JB |
1836 | |
1837 | if (!fs_info->uuid_root) { | |
efe120a0 | 1838 | btrfs_info(fs_info, "creating UUID tree"); |
94aebfb2 JB |
1839 | ret = btrfs_create_uuid_tree(fs_info); |
1840 | if (ret) { | |
5d163e0e JM |
1841 | btrfs_warn(fs_info, |
1842 | "failed to create the UUID tree %d", | |
1843 | ret); | |
94aebfb2 JB |
1844 | goto restore; |
1845 | } | |
1846 | } | |
c146afad | 1847 | sb->s_flags &= ~MS_RDONLY; |
90c711ab | 1848 | |
afcdd129 | 1849 | set_bit(BTRFS_FS_OPEN, &fs_info->flags); |
c146afad | 1850 | } |
dc81cdc5 | 1851 | out: |
2c6a92b0 | 1852 | wake_up_process(fs_info->transaction_kthread); |
dc81cdc5 | 1853 | btrfs_remount_cleanup(fs_info, old_opts); |
c146afad | 1854 | return 0; |
49b25e05 JM |
1855 | |
1856 | restore: | |
1857 | /* We've hit an error - don't reset MS_RDONLY */ | |
1858 | if (sb->s_flags & MS_RDONLY) | |
1859 | old_flags |= MS_RDONLY; | |
1860 | sb->s_flags = old_flags; | |
1861 | fs_info->mount_opt = old_opts; | |
1862 | fs_info->compress_type = old_compress_type; | |
1863 | fs_info->max_inline = old_max_inline; | |
c018daec | 1864 | mutex_lock(&fs_info->chunk_mutex); |
49b25e05 | 1865 | fs_info->alloc_start = old_alloc_start; |
c018daec | 1866 | mutex_unlock(&fs_info->chunk_mutex); |
0d2450ab ST |
1867 | btrfs_resize_thread_pool(fs_info, |
1868 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 | 1869 | fs_info->metadata_ratio = old_metadata_ratio; |
dc81cdc5 | 1870 | btrfs_remount_cleanup(fs_info, old_opts); |
49b25e05 | 1871 | return ret; |
c146afad YZ |
1872 | } |
1873 | ||
bcd53741 AJ |
1874 | /* Used to sort the devices by max_avail(descending sort) */ |
1875 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1876 | const void *dev_info2) | |
1877 | { | |
1878 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1879 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1880 | return -1; | |
1881 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1882 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1883 | return 1; | |
1884 | else | |
1885 | return 0; | |
1886 | } | |
1887 | ||
1888 | /* | |
1889 | * sort the devices by max_avail, in which max free extent size of each device | |
1890 | * is stored.(Descending Sort) | |
1891 | */ | |
1892 | static inline void btrfs_descending_sort_devices( | |
1893 | struct btrfs_device_info *devices, | |
1894 | size_t nr_devices) | |
1895 | { | |
1896 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1897 | btrfs_cmp_device_free_bytes, NULL); | |
1898 | } | |
1899 | ||
6d07bcec MX |
1900 | /* |
1901 | * The helper to calc the free space on the devices that can be used to store | |
1902 | * file data. | |
1903 | */ | |
1904 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1905 | { | |
1906 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1907 | struct btrfs_device_info *devices_info; | |
1908 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1909 | struct btrfs_device *device; | |
1910 | u64 skip_space; | |
1911 | u64 type; | |
1912 | u64 avail_space; | |
1913 | u64 used_space; | |
1914 | u64 min_stripe_size; | |
39fb26c3 | 1915 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1916 | int i = 0, nr_devices; |
1917 | int ret; | |
1918 | ||
7e33fd99 | 1919 | /* |
01327610 | 1920 | * We aren't under the device list lock, so this is racy-ish, but good |
7e33fd99 JB |
1921 | * enough for our purposes. |
1922 | */ | |
b772a86e | 1923 | nr_devices = fs_info->fs_devices->open_devices; |
7e33fd99 JB |
1924 | if (!nr_devices) { |
1925 | smp_mb(); | |
1926 | nr_devices = fs_info->fs_devices->open_devices; | |
1927 | ASSERT(nr_devices); | |
1928 | if (!nr_devices) { | |
1929 | *free_bytes = 0; | |
1930 | return 0; | |
1931 | } | |
1932 | } | |
6d07bcec | 1933 | |
d9b0d9ba | 1934 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
6d07bcec MX |
1935 | GFP_NOFS); |
1936 | if (!devices_info) | |
1937 | return -ENOMEM; | |
1938 | ||
01327610 | 1939 | /* calc min stripe number for data space allocation */ |
6d07bcec | 1940 | type = btrfs_get_alloc_profile(root, 1); |
39fb26c3 | 1941 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1942 | min_stripes = 2; |
39fb26c3 MX |
1943 | num_stripes = nr_devices; |
1944 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1945 | min_stripes = 2; |
39fb26c3 MX |
1946 | num_stripes = 2; |
1947 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1948 | min_stripes = 4; |
39fb26c3 MX |
1949 | num_stripes = 4; |
1950 | } | |
6d07bcec MX |
1951 | |
1952 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1953 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1954 | else | |
1955 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1956 | ||
7e33fd99 JB |
1957 | if (fs_info->alloc_start) |
1958 | mutex_lock(&fs_devices->device_list_mutex); | |
1959 | rcu_read_lock(); | |
1960 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { | |
63a212ab SB |
1961 | if (!device->in_fs_metadata || !device->bdev || |
1962 | device->is_tgtdev_for_dev_replace) | |
6d07bcec MX |
1963 | continue; |
1964 | ||
7e33fd99 JB |
1965 | if (i >= nr_devices) |
1966 | break; | |
1967 | ||
6d07bcec MX |
1968 | avail_space = device->total_bytes - device->bytes_used; |
1969 | ||
1970 | /* align with stripe_len */ | |
f8c269d7 | 1971 | avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); |
6d07bcec MX |
1972 | avail_space *= BTRFS_STRIPE_LEN; |
1973 | ||
1974 | /* | |
01327610 | 1975 | * In order to avoid overwriting the superblock on the drive, |
6d07bcec MX |
1976 | * btrfs starts at an offset of at least 1MB when doing chunk |
1977 | * allocation. | |
1978 | */ | |
ee22184b | 1979 | skip_space = SZ_1M; |
6d07bcec MX |
1980 | |
1981 | /* user can set the offset in fs_info->alloc_start. */ | |
7e33fd99 JB |
1982 | if (fs_info->alloc_start && |
1983 | fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1984 | device->total_bytes) { | |
1985 | rcu_read_unlock(); | |
6d07bcec MX |
1986 | skip_space = max(fs_info->alloc_start, skip_space); |
1987 | ||
7e33fd99 JB |
1988 | /* |
1989 | * btrfs can not use the free space in | |
1990 | * [0, skip_space - 1], we must subtract it from the | |
1991 | * total. In order to implement it, we account the used | |
1992 | * space in this range first. | |
1993 | */ | |
1994 | ret = btrfs_account_dev_extents_size(device, 0, | |
1995 | skip_space - 1, | |
1996 | &used_space); | |
1997 | if (ret) { | |
1998 | kfree(devices_info); | |
1999 | mutex_unlock(&fs_devices->device_list_mutex); | |
2000 | return ret; | |
2001 | } | |
2002 | ||
2003 | rcu_read_lock(); | |
6d07bcec | 2004 | |
7e33fd99 JB |
2005 | /* calc the free space in [0, skip_space - 1] */ |
2006 | skip_space -= used_space; | |
2007 | } | |
6d07bcec MX |
2008 | |
2009 | /* | |
2010 | * we can use the free space in [0, skip_space - 1], subtract | |
2011 | * it from the total. | |
2012 | */ | |
2013 | if (avail_space && avail_space >= skip_space) | |
2014 | avail_space -= skip_space; | |
2015 | else | |
2016 | avail_space = 0; | |
2017 | ||
2018 | if (avail_space < min_stripe_size) | |
2019 | continue; | |
2020 | ||
2021 | devices_info[i].dev = device; | |
2022 | devices_info[i].max_avail = avail_space; | |
2023 | ||
2024 | i++; | |
2025 | } | |
7e33fd99 JB |
2026 | rcu_read_unlock(); |
2027 | if (fs_info->alloc_start) | |
2028 | mutex_unlock(&fs_devices->device_list_mutex); | |
6d07bcec MX |
2029 | |
2030 | nr_devices = i; | |
2031 | ||
2032 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
2033 | ||
2034 | i = nr_devices - 1; | |
2035 | avail_space = 0; | |
2036 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
2037 | if (num_stripes > nr_devices) |
2038 | num_stripes = nr_devices; | |
2039 | ||
6d07bcec MX |
2040 | if (devices_info[i].max_avail >= min_stripe_size) { |
2041 | int j; | |
2042 | u64 alloc_size; | |
2043 | ||
39fb26c3 | 2044 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 2045 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 2046 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
2047 | devices_info[j].max_avail -= alloc_size; |
2048 | } | |
2049 | i--; | |
2050 | nr_devices--; | |
2051 | } | |
2052 | ||
2053 | kfree(devices_info); | |
2054 | *free_bytes = avail_space; | |
2055 | return 0; | |
2056 | } | |
2057 | ||
ba7b6e62 DS |
2058 | /* |
2059 | * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. | |
2060 | * | |
2061 | * If there's a redundant raid level at DATA block groups, use the respective | |
2062 | * multiplier to scale the sizes. | |
2063 | * | |
2064 | * Unused device space usage is based on simulating the chunk allocator | |
2065 | * algorithm that respects the device sizes, order of allocations and the | |
2066 | * 'alloc_start' value, this is a close approximation of the actual use but | |
2067 | * there are other factors that may change the result (like a new metadata | |
2068 | * chunk). | |
2069 | * | |
ca8a51b3 | 2070 | * If metadata is exhausted, f_bavail will be 0. |
ba7b6e62 | 2071 | */ |
8fd17795 CM |
2072 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2073 | { | |
815745cf AV |
2074 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
2075 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
2076 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
2077 | struct btrfs_space_info *found; |
2078 | u64 total_used = 0; | |
6d07bcec | 2079 | u64 total_free_data = 0; |
ca8a51b3 | 2080 | u64 total_free_meta = 0; |
db94535d | 2081 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 2082 | __be32 *fsid = (__be32 *)fs_info->fsid; |
ba7b6e62 DS |
2083 | unsigned factor = 1; |
2084 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
6d07bcec | 2085 | int ret; |
ca8a51b3 | 2086 | u64 thresh = 0; |
ae02d1bd | 2087 | int mixed = 0; |
8fd17795 | 2088 | |
15484377 | 2089 | /* |
180e4d47 | 2090 | * holding chunk_mutex to avoid allocating new chunks, holding |
15484377 MX |
2091 | * device_list_mutex to avoid the device being removed |
2092 | */ | |
bd4d1088 | 2093 | rcu_read_lock(); |
89a55897 | 2094 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec | 2095 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
ba7b6e62 DS |
2096 | int i; |
2097 | ||
6d07bcec MX |
2098 | total_free_data += found->disk_total - found->disk_used; |
2099 | total_free_data -= | |
2100 | btrfs_account_ro_block_groups_free_space(found); | |
ba7b6e62 DS |
2101 | |
2102 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
2103 | if (!list_empty(&found->block_groups[i])) { | |
2104 | switch (i) { | |
2105 | case BTRFS_RAID_DUP: | |
2106 | case BTRFS_RAID_RAID1: | |
2107 | case BTRFS_RAID_RAID10: | |
2108 | factor = 2; | |
2109 | } | |
2110 | } | |
2111 | } | |
6d07bcec | 2112 | } |
ae02d1bd LB |
2113 | |
2114 | /* | |
2115 | * Metadata in mixed block goup profiles are accounted in data | |
2116 | */ | |
2117 | if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
2118 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) | |
2119 | mixed = 1; | |
2120 | else | |
2121 | total_free_meta += found->disk_total - | |
2122 | found->disk_used; | |
2123 | } | |
6d07bcec | 2124 | |
b742bb82 | 2125 | total_used += found->disk_used; |
89a55897 | 2126 | } |
ba7b6e62 | 2127 | |
bd4d1088 JB |
2128 | rcu_read_unlock(); |
2129 | ||
ba7b6e62 DS |
2130 | buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); |
2131 | buf->f_blocks >>= bits; | |
2132 | buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); | |
2133 | ||
2134 | /* Account global block reserve as used, it's in logical size already */ | |
2135 | spin_lock(&block_rsv->lock); | |
41b34acc LB |
2136 | /* Mixed block groups accounting is not byte-accurate, avoid overflow */ |
2137 | if (buf->f_bfree >= block_rsv->size >> bits) | |
2138 | buf->f_bfree -= block_rsv->size >> bits; | |
2139 | else | |
2140 | buf->f_bfree = 0; | |
ba7b6e62 DS |
2141 | spin_unlock(&block_rsv->lock); |
2142 | ||
0d95c1be | 2143 | buf->f_bavail = div_u64(total_free_data, factor); |
815745cf | 2144 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
7e33fd99 | 2145 | if (ret) |
6d07bcec | 2146 | return ret; |
ba7b6e62 | 2147 | buf->f_bavail += div_u64(total_free_data, factor); |
6d07bcec | 2148 | buf->f_bavail = buf->f_bavail >> bits; |
d397712b | 2149 | |
ca8a51b3 DS |
2150 | /* |
2151 | * We calculate the remaining metadata space minus global reserve. If | |
2152 | * this is (supposedly) smaller than zero, there's no space. But this | |
2153 | * does not hold in practice, the exhausted state happens where's still | |
2154 | * some positive delta. So we apply some guesswork and compare the | |
2155 | * delta to a 4M threshold. (Practically observed delta was ~2M.) | |
2156 | * | |
2157 | * We probably cannot calculate the exact threshold value because this | |
2158 | * depends on the internal reservations requested by various | |
2159 | * operations, so some operations that consume a few metadata will | |
2160 | * succeed even if the Avail is zero. But this is better than the other | |
2161 | * way around. | |
2162 | */ | |
2163 | thresh = 4 * 1024 * 1024; | |
2164 | ||
ae02d1bd | 2165 | if (!mixed && total_free_meta - thresh < block_rsv->size) |
ca8a51b3 DS |
2166 | buf->f_bavail = 0; |
2167 | ||
ba7b6e62 DS |
2168 | buf->f_type = BTRFS_SUPER_MAGIC; |
2169 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2170 | buf->f_namelen = BTRFS_NAME_LEN; | |
2171 | ||
9d03632e | 2172 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 2173 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
2174 | on a big-endian or little-endian host */ |
2175 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
2176 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 | 2177 | /* Mask in the root object ID too, to disambiguate subvols */ |
2b0143b5 DH |
2178 | buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; |
2179 | buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; | |
32d48fa1 | 2180 | |
8fd17795 CM |
2181 | return 0; |
2182 | } | |
b5133862 | 2183 | |
aea52e19 AV |
2184 | static void btrfs_kill_super(struct super_block *sb) |
2185 | { | |
815745cf | 2186 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 2187 | kill_anon_super(sb); |
d22ca7de | 2188 | free_fs_info(fs_info); |
aea52e19 AV |
2189 | } |
2190 | ||
2e635a27 CM |
2191 | static struct file_system_type btrfs_fs_type = { |
2192 | .owner = THIS_MODULE, | |
2193 | .name = "btrfs", | |
061dbc6b | 2194 | .mount = btrfs_mount, |
aea52e19 | 2195 | .kill_sb = btrfs_kill_super, |
f667aef6 | 2196 | .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, |
2e635a27 | 2197 | }; |
7f78e035 | 2198 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 2199 | |
d8620958 TVB |
2200 | static int btrfs_control_open(struct inode *inode, struct file *file) |
2201 | { | |
2202 | /* | |
2203 | * The control file's private_data is used to hold the | |
2204 | * transaction when it is started and is used to keep | |
2205 | * track of whether a transaction is already in progress. | |
2206 | */ | |
2207 | file->private_data = NULL; | |
2208 | return 0; | |
2209 | } | |
2210 | ||
d352ac68 CM |
2211 | /* |
2212 | * used by btrfsctl to scan devices when no FS is mounted | |
2213 | */ | |
8a4b83cc CM |
2214 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
2215 | unsigned long arg) | |
2216 | { | |
2217 | struct btrfs_ioctl_vol_args *vol; | |
2218 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 2219 | int ret = -ENOTTY; |
8a4b83cc | 2220 | |
e441d54d CM |
2221 | if (!capable(CAP_SYS_ADMIN)) |
2222 | return -EPERM; | |
2223 | ||
dae7b665 LZ |
2224 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
2225 | if (IS_ERR(vol)) | |
2226 | return PTR_ERR(vol); | |
c071fcfd | 2227 | |
8a4b83cc CM |
2228 | switch (cmd) { |
2229 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 2230 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
2231 | &btrfs_fs_type, &fs_devices); |
2232 | break; | |
02db0844 JB |
2233 | case BTRFS_IOC_DEVICES_READY: |
2234 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
2235 | &btrfs_fs_type, &fs_devices); | |
2236 | if (ret) | |
2237 | break; | |
2238 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
2239 | break; | |
c5868f83 | 2240 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 2241 | ret = btrfs_ioctl_get_supported_features((void __user*)arg); |
c5868f83 | 2242 | break; |
8a4b83cc | 2243 | } |
dae7b665 | 2244 | |
8a4b83cc | 2245 | kfree(vol); |
f819d837 | 2246 | return ret; |
8a4b83cc CM |
2247 | } |
2248 | ||
0176260f | 2249 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 2250 | { |
354aa0fb MX |
2251 | struct btrfs_trans_handle *trans; |
2252 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
2253 | ||
9e7cc91a WX |
2254 | root->fs_info->fs_frozen = 1; |
2255 | /* | |
2256 | * We don't need a barrier here, we'll wait for any transaction that | |
2257 | * could be in progress on other threads (and do delayed iputs that | |
2258 | * we want to avoid on a frozen filesystem), or do the commit | |
2259 | * ourselves. | |
2260 | */ | |
d4edf39b | 2261 | trans = btrfs_attach_transaction_barrier(root); |
354aa0fb MX |
2262 | if (IS_ERR(trans)) { |
2263 | /* no transaction, don't bother */ | |
2264 | if (PTR_ERR(trans) == -ENOENT) | |
2265 | return 0; | |
2266 | return PTR_ERR(trans); | |
2267 | } | |
2268 | return btrfs_commit_transaction(trans, root); | |
ed0dab6b Y |
2269 | } |
2270 | ||
9e7cc91a WX |
2271 | static int btrfs_unfreeze(struct super_block *sb) |
2272 | { | |
2273 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
2274 | ||
2275 | root->fs_info->fs_frozen = 0; | |
2276 | return 0; | |
2277 | } | |
2278 | ||
9c5085c1 JB |
2279 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
2280 | { | |
2281 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
2282 | struct btrfs_fs_devices *cur_devices; | |
2283 | struct btrfs_device *dev, *first_dev = NULL; | |
2284 | struct list_head *head; | |
2285 | struct rcu_string *name; | |
2286 | ||
2287 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
2288 | cur_devices = fs_info->fs_devices; | |
2289 | while (cur_devices) { | |
2290 | head = &cur_devices->devices; | |
2291 | list_for_each_entry(dev, head, dev_list) { | |
aa9ddcd4 JB |
2292 | if (dev->missing) |
2293 | continue; | |
0aeb8a6e AJ |
2294 | if (!dev->name) |
2295 | continue; | |
9c5085c1 JB |
2296 | if (!first_dev || dev->devid < first_dev->devid) |
2297 | first_dev = dev; | |
2298 | } | |
2299 | cur_devices = cur_devices->seed; | |
2300 | } | |
2301 | ||
2302 | if (first_dev) { | |
2303 | rcu_read_lock(); | |
2304 | name = rcu_dereference(first_dev->name); | |
2305 | seq_escape(m, name->str, " \t\n\\"); | |
2306 | rcu_read_unlock(); | |
2307 | } else { | |
2308 | WARN_ON(1); | |
2309 | } | |
2310 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
2311 | return 0; | |
2312 | } | |
2313 | ||
b87221de | 2314 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 2315 | .drop_inode = btrfs_drop_inode, |
bd555975 | 2316 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 2317 | .put_super = btrfs_put_super, |
d5719762 | 2318 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 2319 | .show_options = btrfs_show_options, |
9c5085c1 | 2320 | .show_devname = btrfs_show_devname, |
4730a4bc | 2321 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
2322 | .alloc_inode = btrfs_alloc_inode, |
2323 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2324 | .statfs = btrfs_statfs, |
c146afad | 2325 | .remount_fs = btrfs_remount, |
0176260f | 2326 | .freeze_fs = btrfs_freeze, |
9e7cc91a | 2327 | .unfreeze_fs = btrfs_unfreeze, |
e20d96d6 | 2328 | }; |
a9218f6b CM |
2329 | |
2330 | static const struct file_operations btrfs_ctl_fops = { | |
d8620958 | 2331 | .open = btrfs_control_open, |
a9218f6b CM |
2332 | .unlocked_ioctl = btrfs_control_ioctl, |
2333 | .compat_ioctl = btrfs_control_ioctl, | |
2334 | .owner = THIS_MODULE, | |
6038f373 | 2335 | .llseek = noop_llseek, |
a9218f6b CM |
2336 | }; |
2337 | ||
2338 | static struct miscdevice btrfs_misc = { | |
578454ff | 2339 | .minor = BTRFS_MINOR, |
a9218f6b CM |
2340 | .name = "btrfs-control", |
2341 | .fops = &btrfs_ctl_fops | |
2342 | }; | |
2343 | ||
578454ff KS |
2344 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
2345 | MODULE_ALIAS("devname:btrfs-control"); | |
2346 | ||
a9218f6b CM |
2347 | static int btrfs_interface_init(void) |
2348 | { | |
2349 | return misc_register(&btrfs_misc); | |
2350 | } | |
2351 | ||
b2950863 | 2352 | static void btrfs_interface_exit(void) |
a9218f6b | 2353 | { |
f368ed60 | 2354 | misc_deregister(&btrfs_misc); |
a9218f6b CM |
2355 | } |
2356 | ||
8ae1af3c | 2357 | static void btrfs_print_mod_info(void) |
85965600 | 2358 | { |
62e85577 | 2359 | pr_info("Btrfs loaded, crc32c=%s" |
85965600 DS |
2360 | #ifdef CONFIG_BTRFS_DEBUG |
2361 | ", debug=on" | |
2362 | #endif | |
79556c3d SB |
2363 | #ifdef CONFIG_BTRFS_ASSERT |
2364 | ", assert=on" | |
2365 | #endif | |
85965600 DS |
2366 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
2367 | ", integrity-checker=on" | |
2368 | #endif | |
5f9e1059 JM |
2369 | "\n", |
2370 | btrfs_crc32c_impl()); | |
85965600 DS |
2371 | } |
2372 | ||
2e635a27 CM |
2373 | static int __init init_btrfs_fs(void) |
2374 | { | |
2c90e5d6 | 2375 | int err; |
58176a96 | 2376 | |
14a958e6 FDBM |
2377 | err = btrfs_hash_init(); |
2378 | if (err) | |
2379 | return err; | |
2380 | ||
63541927 FDBM |
2381 | btrfs_props_init(); |
2382 | ||
58176a96 JB |
2383 | err = btrfs_init_sysfs(); |
2384 | if (err) | |
14a958e6 | 2385 | goto free_hash; |
58176a96 | 2386 | |
143bede5 | 2387 | btrfs_init_compress(); |
d1310b2e | 2388 | |
261507a0 LZ |
2389 | err = btrfs_init_cachep(); |
2390 | if (err) | |
2391 | goto free_compress; | |
2392 | ||
d1310b2e | 2393 | err = extent_io_init(); |
2f4cbe64 WB |
2394 | if (err) |
2395 | goto free_cachep; | |
2396 | ||
d1310b2e CM |
2397 | err = extent_map_init(); |
2398 | if (err) | |
2399 | goto free_extent_io; | |
2400 | ||
6352b91d | 2401 | err = ordered_data_init(); |
2f4cbe64 WB |
2402 | if (err) |
2403 | goto free_extent_map; | |
c8b97818 | 2404 | |
6352b91d MX |
2405 | err = btrfs_delayed_inode_init(); |
2406 | if (err) | |
2407 | goto free_ordered_data; | |
2408 | ||
9247f317 | 2409 | err = btrfs_auto_defrag_init(); |
16cdcec7 MX |
2410 | if (err) |
2411 | goto free_delayed_inode; | |
2412 | ||
78a6184a | 2413 | err = btrfs_delayed_ref_init(); |
9247f317 MX |
2414 | if (err) |
2415 | goto free_auto_defrag; | |
2416 | ||
b9e9a6cb WS |
2417 | err = btrfs_prelim_ref_init(); |
2418 | if (err) | |
af13b492 | 2419 | goto free_delayed_ref; |
b9e9a6cb | 2420 | |
97eb6b69 | 2421 | err = btrfs_end_io_wq_init(); |
78a6184a | 2422 | if (err) |
af13b492 | 2423 | goto free_prelim_ref; |
78a6184a | 2424 | |
97eb6b69 DS |
2425 | err = btrfs_interface_init(); |
2426 | if (err) | |
2427 | goto free_end_io_wq; | |
2428 | ||
e565d4b9 JS |
2429 | btrfs_init_lockdep(); |
2430 | ||
8ae1af3c | 2431 | btrfs_print_mod_info(); |
dc11dd5d JB |
2432 | |
2433 | err = btrfs_run_sanity_tests(); | |
2434 | if (err) | |
2435 | goto unregister_ioctl; | |
2436 | ||
2437 | err = register_filesystem(&btrfs_fs_type); | |
2438 | if (err) | |
2439 | goto unregister_ioctl; | |
74255aa0 | 2440 | |
2f4cbe64 WB |
2441 | return 0; |
2442 | ||
a9218f6b CM |
2443 | unregister_ioctl: |
2444 | btrfs_interface_exit(); | |
97eb6b69 DS |
2445 | free_end_io_wq: |
2446 | btrfs_end_io_wq_exit(); | |
b9e9a6cb WS |
2447 | free_prelim_ref: |
2448 | btrfs_prelim_ref_exit(); | |
78a6184a MX |
2449 | free_delayed_ref: |
2450 | btrfs_delayed_ref_exit(); | |
9247f317 MX |
2451 | free_auto_defrag: |
2452 | btrfs_auto_defrag_exit(); | |
16cdcec7 MX |
2453 | free_delayed_inode: |
2454 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
2455 | free_ordered_data: |
2456 | ordered_data_exit(); | |
2f4cbe64 WB |
2457 | free_extent_map: |
2458 | extent_map_exit(); | |
d1310b2e CM |
2459 | free_extent_io: |
2460 | extent_io_exit(); | |
2f4cbe64 WB |
2461 | free_cachep: |
2462 | btrfs_destroy_cachep(); | |
261507a0 LZ |
2463 | free_compress: |
2464 | btrfs_exit_compress(); | |
2f4cbe64 | 2465 | btrfs_exit_sysfs(); |
14a958e6 FDBM |
2466 | free_hash: |
2467 | btrfs_hash_exit(); | |
2f4cbe64 | 2468 | return err; |
2e635a27 CM |
2469 | } |
2470 | ||
2471 | static void __exit exit_btrfs_fs(void) | |
2472 | { | |
39279cc3 | 2473 | btrfs_destroy_cachep(); |
78a6184a | 2474 | btrfs_delayed_ref_exit(); |
9247f317 | 2475 | btrfs_auto_defrag_exit(); |
16cdcec7 | 2476 | btrfs_delayed_inode_exit(); |
b9e9a6cb | 2477 | btrfs_prelim_ref_exit(); |
6352b91d | 2478 | ordered_data_exit(); |
a52d9a80 | 2479 | extent_map_exit(); |
d1310b2e | 2480 | extent_io_exit(); |
a9218f6b | 2481 | btrfs_interface_exit(); |
5ed5f588 | 2482 | btrfs_end_io_wq_exit(); |
2e635a27 | 2483 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 2484 | btrfs_exit_sysfs(); |
8a4b83cc | 2485 | btrfs_cleanup_fs_uuids(); |
261507a0 | 2486 | btrfs_exit_compress(); |
14a958e6 | 2487 | btrfs_hash_exit(); |
2e635a27 CM |
2488 | } |
2489 | ||
60efa5eb | 2490 | late_initcall(init_btrfs_fs); |
2e635a27 CM |
2491 | module_exit(exit_btrfs_fs) |
2492 | ||
2493 | MODULE_LICENSE("GPL"); |