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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
6cbd5570 CM |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
6cbd5570 CM |
4 | */ |
5 | ||
4b82d6e4 | 6 | #include <linux/blkdev.h> |
2e635a27 CM |
7 | #include <linux/module.h> |
8 | #include <linux/fs.h> | |
9 | #include <linux/pagemap.h> | |
10 | #include <linux/highmem.h> | |
11 | #include <linux/time.h> | |
12 | #include <linux/init.h> | |
a9572a15 | 13 | #include <linux/seq_file.h> |
2e635a27 | 14 | #include <linux/string.h> |
2e635a27 | 15 | #include <linux/backing-dev.h> |
4b82d6e4 | 16 | #include <linux/mount.h> |
75dfe396 | 17 | #include <linux/writeback.h> |
8fd17795 | 18 | #include <linux/statfs.h> |
08607c1b | 19 | #include <linux/compat.h> |
95e05289 | 20 | #include <linux/parser.h> |
c59f8951 | 21 | #include <linux/ctype.h> |
6da6abae | 22 | #include <linux/namei.h> |
a9218f6b | 23 | #include <linux/miscdevice.h> |
1bcbf313 | 24 | #include <linux/magic.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
90a887c9 | 26 | #include <linux/cleancache.h> |
22c44fe6 | 27 | #include <linux/ratelimit.h> |
9678c543 | 28 | #include <linux/crc32c.h> |
55e301fd | 29 | #include <linux/btrfs.h> |
16cdcec7 | 30 | #include "delayed-inode.h" |
2e635a27 | 31 | #include "ctree.h" |
e20d96d6 | 32 | #include "disk-io.h" |
d5719762 | 33 | #include "transaction.h" |
2c90e5d6 | 34 | #include "btrfs_inode.h" |
3a686375 | 35 | #include "print-tree.h" |
63541927 | 36 | #include "props.h" |
5103e947 | 37 | #include "xattr.h" |
8a4b83cc | 38 | #include "volumes.h" |
be6e8dc0 | 39 | #include "export.h" |
c8b97818 | 40 | #include "compression.h" |
9c5085c1 | 41 | #include "rcu-string.h" |
8dabb742 | 42 | #include "dev-replace.h" |
74255aa0 | 43 | #include "free-space-cache.h" |
b9e9a6cb | 44 | #include "backref.h" |
dc11dd5d | 45 | #include "tests/btrfs-tests.h" |
2e635a27 | 46 | |
d3982100 | 47 | #include "qgroup.h" |
1abe9b8a | 48 | #define CREATE_TRACE_POINTS |
49 | #include <trace/events/btrfs.h> | |
50 | ||
b87221de | 51 | static const struct super_operations btrfs_super_ops; |
72fa39f5 MT |
52 | |
53 | /* | |
54 | * Types for mounting the default subvolume and a subvolume explicitly | |
55 | * requested by subvol=/path. That way the callchain is straightforward and we | |
56 | * don't have to play tricks with the mount options and recursive calls to | |
57 | * btrfs_mount. | |
312c89fb MT |
58 | * |
59 | * The new btrfs_root_fs_type also servers as a tag for the bdev_holder. | |
72fa39f5 | 60 | */ |
830c4adb | 61 | static struct file_system_type btrfs_fs_type; |
72fa39f5 | 62 | static struct file_system_type btrfs_root_fs_type; |
75dfe396 | 63 | |
0723a047 HH |
64 | static int btrfs_remount(struct super_block *sb, int *flags, char *data); |
65 | ||
e33e17ee | 66 | const char *btrfs_decode_error(int errno) |
acce952b | 67 | { |
08748810 | 68 | char *errstr = "unknown"; |
acce952b | 69 | |
70 | switch (errno) { | |
71 | case -EIO: | |
72 | errstr = "IO failure"; | |
73 | break; | |
74 | case -ENOMEM: | |
75 | errstr = "Out of memory"; | |
76 | break; | |
77 | case -EROFS: | |
78 | errstr = "Readonly filesystem"; | |
79 | break; | |
8c342930 JM |
80 | case -EEXIST: |
81 | errstr = "Object already exists"; | |
82 | break; | |
94ef7280 DS |
83 | case -ENOSPC: |
84 | errstr = "No space left"; | |
85 | break; | |
86 | case -ENOENT: | |
87 | errstr = "No such entry"; | |
88 | break; | |
acce952b | 89 | } |
90 | ||
91 | return errstr; | |
92 | } | |
93 | ||
acce952b | 94 | /* |
34d97007 | 95 | * __btrfs_handle_fs_error decodes expected errors from the caller and |
acce952b | 96 | * invokes the approciate error response. |
97 | */ | |
c0d19e2b | 98 | __cold |
34d97007 | 99 | void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, |
4da35113 | 100 | unsigned int line, int errno, const char *fmt, ...) |
acce952b | 101 | { |
102 | struct super_block *sb = fs_info->sb; | |
57d816a1 | 103 | #ifdef CONFIG_PRINTK |
acce952b | 104 | const char *errstr; |
57d816a1 | 105 | #endif |
acce952b | 106 | |
107 | /* | |
108 | * Special case: if the error is EROFS, and we're already | |
1751e8a6 | 109 | * under SB_RDONLY, then it is safe here. |
acce952b | 110 | */ |
bc98a42c | 111 | if (errno == -EROFS && sb_rdonly(sb)) |
4da35113 JM |
112 | return; |
113 | ||
57d816a1 | 114 | #ifdef CONFIG_PRINTK |
08748810 | 115 | errstr = btrfs_decode_error(errno); |
4da35113 | 116 | if (fmt) { |
37252a66 ES |
117 | struct va_format vaf; |
118 | va_list args; | |
119 | ||
120 | va_start(args, fmt); | |
121 | vaf.fmt = fmt; | |
122 | vaf.va = &args; | |
4da35113 | 123 | |
62e85577 | 124 | pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", |
08748810 | 125 | sb->s_id, function, line, errno, errstr, &vaf); |
37252a66 | 126 | va_end(args); |
4da35113 | 127 | } else { |
62e85577 | 128 | pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s\n", |
08748810 | 129 | sb->s_id, function, line, errno, errstr); |
4da35113 | 130 | } |
57d816a1 | 131 | #endif |
acce952b | 132 | |
0713d90c AJ |
133 | /* |
134 | * Today we only save the error info to memory. Long term we'll | |
135 | * also send it down to the disk | |
136 | */ | |
137 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); | |
138 | ||
4da35113 | 139 | /* Don't go through full error handling during mount */ |
922ea899 AJ |
140 | if (!(sb->s_flags & SB_BORN)) |
141 | return; | |
142 | ||
143 | if (sb_rdonly(sb)) | |
144 | return; | |
145 | ||
146 | /* btrfs handle error by forcing the filesystem readonly */ | |
147 | sb->s_flags |= SB_RDONLY; | |
148 | btrfs_info(fs_info, "forced readonly"); | |
149 | /* | |
150 | * Note that a running device replace operation is not canceled here | |
151 | * although there is no way to update the progress. It would add the | |
152 | * risk of a deadlock, therefore the canceling is omitted. The only | |
153 | * penalty is that some I/O remains active until the procedure | |
154 | * completes. The next time when the filesystem is mounted writeable | |
155 | * again, the device replace operation continues. | |
156 | */ | |
4da35113 | 157 | } |
acce952b | 158 | |
57d816a1 | 159 | #ifdef CONFIG_PRINTK |
533574c6 | 160 | static const char * const logtypes[] = { |
4da35113 JM |
161 | "emergency", |
162 | "alert", | |
163 | "critical", | |
164 | "error", | |
165 | "warning", | |
166 | "notice", | |
167 | "info", | |
168 | "debug", | |
169 | }; | |
170 | ||
35f4e5e6 NB |
171 | |
172 | /* | |
173 | * Use one ratelimit state per log level so that a flood of less important | |
174 | * messages doesn't cause more important ones to be dropped. | |
175 | */ | |
176 | static struct ratelimit_state printk_limits[] = { | |
177 | RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100), | |
178 | RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100), | |
179 | RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100), | |
180 | RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100), | |
181 | RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100), | |
182 | RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100), | |
183 | RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100), | |
184 | RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100), | |
185 | }; | |
186 | ||
c2cf52eb | 187 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
4da35113 | 188 | { |
40f7828b | 189 | char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0"; |
4da35113 JM |
190 | struct va_format vaf; |
191 | va_list args; | |
533574c6 | 192 | int kern_level; |
40f7828b PM |
193 | const char *type = logtypes[4]; |
194 | struct ratelimit_state *ratelimit = &printk_limits[4]; | |
4da35113 JM |
195 | |
196 | va_start(args, fmt); | |
197 | ||
262c5e86 | 198 | while ((kern_level = printk_get_level(fmt)) != 0) { |
533574c6 | 199 | size_t size = printk_skip_level(fmt) - fmt; |
262c5e86 PM |
200 | |
201 | if (kern_level >= '0' && kern_level <= '7') { | |
202 | memcpy(lvl, fmt, size); | |
203 | lvl[size] = '\0'; | |
204 | type = logtypes[kern_level - '0']; | |
205 | ratelimit = &printk_limits[kern_level - '0']; | |
206 | } | |
533574c6 | 207 | fmt += size; |
262c5e86 PM |
208 | } |
209 | ||
4da35113 JM |
210 | vaf.fmt = fmt; |
211 | vaf.va = &args; | |
533574c6 | 212 | |
35f4e5e6 | 213 | if (__ratelimit(ratelimit)) |
3993b112 CIK |
214 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, |
215 | fs_info ? fs_info->sb->s_id : "<unknown>", &vaf); | |
533574c6 JP |
216 | |
217 | va_end(args); | |
218 | } | |
533574c6 | 219 | #endif |
acce952b | 220 | |
49b25e05 JM |
221 | /* |
222 | * We only mark the transaction aborted and then set the file system read-only. | |
223 | * This will prevent new transactions from starting or trying to join this | |
224 | * one. | |
225 | * | |
226 | * This means that error recovery at the call site is limited to freeing | |
227 | * any local memory allocations and passing the error code up without | |
228 | * further cleanup. The transaction should complete as it normally would | |
229 | * in the call path but will return -EIO. | |
230 | * | |
231 | * We'll complete the cleanup in btrfs_end_transaction and | |
232 | * btrfs_commit_transaction. | |
233 | */ | |
c0d19e2b | 234 | __cold |
49b25e05 | 235 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, |
66642832 | 236 | const char *function, |
49b25e05 JM |
237 | unsigned int line, int errno) |
238 | { | |
66642832 JM |
239 | struct btrfs_fs_info *fs_info = trans->fs_info; |
240 | ||
49b25e05 JM |
241 | trans->aborted = errno; |
242 | /* Nothing used. The other threads that have joined this | |
243 | * transaction may be able to continue. */ | |
64c12921 | 244 | if (!trans->dirty && list_empty(&trans->new_bgs)) { |
69ce977a MX |
245 | const char *errstr; |
246 | ||
08748810 | 247 | errstr = btrfs_decode_error(errno); |
66642832 | 248 | btrfs_warn(fs_info, |
c2cf52eb SK |
249 | "%s:%d: Aborting unused transaction(%s).", |
250 | function, line, errstr); | |
acce952b | 251 | return; |
49b25e05 | 252 | } |
20c7bcec | 253 | WRITE_ONCE(trans->transaction->aborted, errno); |
501407aa | 254 | /* Wake up anybody who may be waiting on this transaction */ |
66642832 JM |
255 | wake_up(&fs_info->transaction_wait); |
256 | wake_up(&fs_info->transaction_blocked_wait); | |
257 | __btrfs_handle_fs_error(fs_info, function, line, errno, NULL); | |
49b25e05 | 258 | } |
8c342930 JM |
259 | /* |
260 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
261 | * issues an alert, and either panics or BUGs, depending on mount options. | |
262 | */ | |
c0d19e2b | 263 | __cold |
8c342930 JM |
264 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, |
265 | unsigned int line, int errno, const char *fmt, ...) | |
266 | { | |
8c342930 JM |
267 | char *s_id = "<unknown>"; |
268 | const char *errstr; | |
269 | struct va_format vaf = { .fmt = fmt }; | |
270 | va_list args; | |
acce952b | 271 | |
8c342930 JM |
272 | if (fs_info) |
273 | s_id = fs_info->sb->s_id; | |
acce952b | 274 | |
8c342930 JM |
275 | va_start(args, fmt); |
276 | vaf.va = &args; | |
277 | ||
08748810 | 278 | errstr = btrfs_decode_error(errno); |
d8953d69 | 279 | if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR))) |
08748810 DS |
280 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
281 | s_id, function, line, &vaf, errno, errstr); | |
8c342930 | 282 | |
efe120a0 FH |
283 | btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", |
284 | function, line, &vaf, errno, errstr); | |
8c342930 JM |
285 | va_end(args); |
286 | /* Caller calls BUG() */ | |
acce952b | 287 | } |
288 | ||
d397712b | 289 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 290 | { |
6bccf3ab | 291 | close_ctree(btrfs_sb(sb)); |
75dfe396 CM |
292 | } |
293 | ||
95e05289 | 294 | enum { |
416a7202 DS |
295 | Opt_acl, Opt_noacl, |
296 | Opt_clear_cache, | |
297 | Opt_commit_interval, | |
298 | Opt_compress, | |
299 | Opt_compress_force, | |
300 | Opt_compress_force_type, | |
301 | Opt_compress_type, | |
302 | Opt_degraded, | |
303 | Opt_device, | |
304 | Opt_fatal_errors, | |
305 | Opt_flushoncommit, Opt_noflushoncommit, | |
306 | Opt_inode_cache, Opt_noinode_cache, | |
307 | Opt_max_inline, | |
308 | Opt_barrier, Opt_nobarrier, | |
309 | Opt_datacow, Opt_nodatacow, | |
310 | Opt_datasum, Opt_nodatasum, | |
311 | Opt_defrag, Opt_nodefrag, | |
312 | Opt_discard, Opt_nodiscard, | |
313 | Opt_nologreplay, | |
314 | Opt_norecovery, | |
315 | Opt_ratio, | |
316 | Opt_rescan_uuid_tree, | |
317 | Opt_skip_balance, | |
318 | Opt_space_cache, Opt_no_space_cache, | |
319 | Opt_space_cache_version, | |
320 | Opt_ssd, Opt_nossd, | |
321 | Opt_ssd_spread, Opt_nossd_spread, | |
322 | Opt_subvol, | |
37becec9 | 323 | Opt_subvol_empty, |
416a7202 DS |
324 | Opt_subvolid, |
325 | Opt_thread_pool, | |
326 | Opt_treelog, Opt_notreelog, | |
327 | Opt_usebackuproot, | |
328 | Opt_user_subvol_rm_allowed, | |
329 | ||
330 | /* Deprecated options */ | |
331 | Opt_alloc_start, | |
332 | Opt_recovery, | |
333 | Opt_subvolrootid, | |
334 | ||
335 | /* Debugging options */ | |
336 | Opt_check_integrity, | |
70f6d82e | 337 | Opt_check_integrity_including_extent_data, |
416a7202 DS |
338 | Opt_check_integrity_print_mask, |
339 | Opt_enospc_debug, Opt_noenospc_debug, | |
d0bd4560 JB |
340 | #ifdef CONFIG_BTRFS_DEBUG |
341 | Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, | |
fb592373 JB |
342 | #endif |
343 | #ifdef CONFIG_BTRFS_FS_REF_VERIFY | |
344 | Opt_ref_verify, | |
d0bd4560 | 345 | #endif |
9555c6c1 | 346 | Opt_err, |
95e05289 CM |
347 | }; |
348 | ||
4d4ab6d6 | 349 | static const match_table_t tokens = { |
416a7202 DS |
350 | {Opt_acl, "acl"}, |
351 | {Opt_noacl, "noacl"}, | |
352 | {Opt_clear_cache, "clear_cache"}, | |
353 | {Opt_commit_interval, "commit=%u"}, | |
c8b97818 | 354 | {Opt_compress, "compress"}, |
261507a0 | 355 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 356 | {Opt_compress_force, "compress-force"}, |
261507a0 | 357 | {Opt_compress_force_type, "compress-force=%s"}, |
416a7202 DS |
358 | {Opt_degraded, "degraded"}, |
359 | {Opt_device, "device=%s"}, | |
360 | {Opt_fatal_errors, "fatal_errors=%s"}, | |
dccae999 | 361 | {Opt_flushoncommit, "flushoncommit"}, |
2c9ee856 | 362 | {Opt_noflushoncommit, "noflushoncommit"}, |
416a7202 DS |
363 | {Opt_inode_cache, "inode_cache"}, |
364 | {Opt_noinode_cache, "noinode_cache"}, | |
365 | {Opt_max_inline, "max_inline=%s"}, | |
366 | {Opt_barrier, "barrier"}, | |
367 | {Opt_nobarrier, "nobarrier"}, | |
368 | {Opt_datacow, "datacow"}, | |
369 | {Opt_nodatacow, "nodatacow"}, | |
370 | {Opt_datasum, "datasum"}, | |
371 | {Opt_nodatasum, "nodatasum"}, | |
372 | {Opt_defrag, "autodefrag"}, | |
373 | {Opt_nodefrag, "noautodefrag"}, | |
e244a0ae | 374 | {Opt_discard, "discard"}, |
e07a2ade | 375 | {Opt_nodiscard, "nodiscard"}, |
416a7202 DS |
376 | {Opt_nologreplay, "nologreplay"}, |
377 | {Opt_norecovery, "norecovery"}, | |
378 | {Opt_ratio, "metadata_ratio=%u"}, | |
379 | {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, | |
380 | {Opt_skip_balance, "skip_balance"}, | |
0af3d00b | 381 | {Opt_space_cache, "space_cache"}, |
8965593e | 382 | {Opt_no_space_cache, "nospace_cache"}, |
416a7202 DS |
383 | {Opt_space_cache_version, "space_cache=%s"}, |
384 | {Opt_ssd, "ssd"}, | |
385 | {Opt_nossd, "nossd"}, | |
386 | {Opt_ssd_spread, "ssd_spread"}, | |
387 | {Opt_nossd_spread, "nossd_spread"}, | |
388 | {Opt_subvol, "subvol=%s"}, | |
37becec9 | 389 | {Opt_subvol_empty, "subvol="}, |
416a7202 DS |
390 | {Opt_subvolid, "subvolid=%s"}, |
391 | {Opt_thread_pool, "thread_pool=%u"}, | |
392 | {Opt_treelog, "treelog"}, | |
393 | {Opt_notreelog, "notreelog"}, | |
8dcddfa0 | 394 | {Opt_usebackuproot, "usebackuproot"}, |
416a7202 DS |
395 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
396 | ||
397 | /* Deprecated options */ | |
398 | {Opt_alloc_start, "alloc_start=%s"}, | |
399 | {Opt_recovery, "recovery"}, | |
400 | {Opt_subvolrootid, "subvolrootid=%d"}, | |
401 | ||
402 | /* Debugging options */ | |
21adbd5c SB |
403 | {Opt_check_integrity, "check_int"}, |
404 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
02453bde | 405 | {Opt_check_integrity_print_mask, "check_int_print_mask=%u"}, |
416a7202 DS |
406 | {Opt_enospc_debug, "enospc_debug"}, |
407 | {Opt_noenospc_debug, "noenospc_debug"}, | |
d0bd4560 JB |
408 | #ifdef CONFIG_BTRFS_DEBUG |
409 | {Opt_fragment_data, "fragment=data"}, | |
410 | {Opt_fragment_metadata, "fragment=metadata"}, | |
411 | {Opt_fragment_all, "fragment=all"}, | |
fb592373 JB |
412 | #endif |
413 | #ifdef CONFIG_BTRFS_FS_REF_VERIFY | |
414 | {Opt_ref_verify, "ref_verify"}, | |
d0bd4560 | 415 | #endif |
33268eaf | 416 | {Opt_err, NULL}, |
95e05289 CM |
417 | }; |
418 | ||
edf24abe CH |
419 | /* |
420 | * Regular mount options parser. Everything that is needed only when | |
421 | * reading in a new superblock is parsed here. | |
49b25e05 | 422 | * XXX JDM: This needs to be cleaned up for remount. |
edf24abe | 423 | */ |
2ff7e61e | 424 | int btrfs_parse_options(struct btrfs_fs_info *info, char *options, |
96da0919 | 425 | unsigned long new_flags) |
95e05289 | 426 | { |
95e05289 | 427 | substring_t args[MAX_OPT_ARGS]; |
e215772c | 428 | char *p, *num; |
73bc1876 | 429 | u64 cache_gen; |
4543df7e | 430 | int intarg; |
a7a3f7ca | 431 | int ret = 0; |
261507a0 LZ |
432 | char *compress_type; |
433 | bool compress_force = false; | |
b7c47bbb TI |
434 | enum btrfs_compression_type saved_compress_type; |
435 | bool saved_compress_force; | |
436 | int no_compress = 0; | |
b6cda9bc | 437 | |
0b246afa JM |
438 | cache_gen = btrfs_super_cache_generation(info->super_copy); |
439 | if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) | |
70f6d82e OS |
440 | btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); |
441 | else if (cache_gen) | |
73bc1876 JB |
442 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
443 | ||
96da0919 QW |
444 | /* |
445 | * Even the options are empty, we still need to do extra check | |
446 | * against new flags | |
447 | */ | |
95e05289 | 448 | if (!options) |
96da0919 | 449 | goto check; |
95e05289 | 450 | |
edf24abe | 451 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
452 | int token; |
453 | if (!*p) | |
454 | continue; | |
455 | ||
456 | token = match_token(p, tokens, args); | |
457 | switch (token) { | |
dfe25020 | 458 | case Opt_degraded: |
0b246afa | 459 | btrfs_info(info, "allowing degraded mounts"); |
edf24abe | 460 | btrfs_set_opt(info->mount_opt, DEGRADED); |
dfe25020 | 461 | break; |
95e05289 | 462 | case Opt_subvol: |
37becec9 | 463 | case Opt_subvol_empty: |
73f73415 | 464 | case Opt_subvolid: |
e15d0542 | 465 | case Opt_subvolrootid: |
43e570b0 | 466 | case Opt_device: |
edf24abe | 467 | /* |
d7407606 MT |
468 | * These are parsed by btrfs_parse_subvol_options |
469 | * and btrfs_parse_early_options | |
edf24abe CH |
470 | * and can be happily ignored here. |
471 | */ | |
b6cda9bc CM |
472 | break; |
473 | case Opt_nodatasum: | |
3cdde224 | 474 | btrfs_set_and_info(info, NODATASUM, |
07802534 | 475 | "setting nodatasum"); |
be20aa9d | 476 | break; |
d399167d | 477 | case Opt_datasum: |
3cdde224 JM |
478 | if (btrfs_test_opt(info, NODATASUM)) { |
479 | if (btrfs_test_opt(info, NODATACOW)) | |
0b246afa | 480 | btrfs_info(info, |
5d163e0e | 481 | "setting datasum, datacow enabled"); |
07802534 | 482 | else |
0b246afa | 483 | btrfs_info(info, "setting datasum"); |
07802534 | 484 | } |
d399167d QW |
485 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
486 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
487 | break; | |
be20aa9d | 488 | case Opt_nodatacow: |
3cdde224 JM |
489 | if (!btrfs_test_opt(info, NODATACOW)) { |
490 | if (!btrfs_test_opt(info, COMPRESS) || | |
491 | !btrfs_test_opt(info, FORCE_COMPRESS)) { | |
0b246afa | 492 | btrfs_info(info, |
07802534 QW |
493 | "setting nodatacow, compression disabled"); |
494 | } else { | |
0b246afa | 495 | btrfs_info(info, "setting nodatacow"); |
07802534 | 496 | } |
bedb2cca | 497 | } |
bedb2cca AP |
498 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
499 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
edf24abe CH |
500 | btrfs_set_opt(info->mount_opt, NODATACOW); |
501 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 502 | break; |
a258af7a | 503 | case Opt_datacow: |
3cdde224 | 504 | btrfs_clear_and_info(info, NODATACOW, |
07802534 | 505 | "setting datacow"); |
a258af7a | 506 | break; |
a555f810 | 507 | case Opt_compress_force: |
261507a0 LZ |
508 | case Opt_compress_force_type: |
509 | compress_force = true; | |
1c697d4a | 510 | /* Fallthrough */ |
261507a0 LZ |
511 | case Opt_compress: |
512 | case Opt_compress_type: | |
3cdde224 JM |
513 | saved_compress_type = btrfs_test_opt(info, |
514 | COMPRESS) ? | |
b7c47bbb TI |
515 | info->compress_type : BTRFS_COMPRESS_NONE; |
516 | saved_compress_force = | |
3cdde224 | 517 | btrfs_test_opt(info, FORCE_COMPRESS); |
261507a0 LZ |
518 | if (token == Opt_compress || |
519 | token == Opt_compress_force || | |
a7164fa4 | 520 | strncmp(args[0].from, "zlib", 4) == 0) { |
261507a0 | 521 | compress_type = "zlib"; |
eae8d825 | 522 | |
261507a0 | 523 | info->compress_type = BTRFS_COMPRESS_ZLIB; |
eae8d825 QW |
524 | info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL; |
525 | /* | |
526 | * args[0] contains uninitialized data since | |
527 | * for these tokens we don't expect any | |
528 | * parameter. | |
529 | */ | |
530 | if (token != Opt_compress && | |
531 | token != Opt_compress_force) | |
532 | info->compress_level = | |
533 | btrfs_compress_str2level(args[0].from); | |
063849ea | 534 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
535 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
536 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
b7c47bbb | 537 | no_compress = 0; |
a7164fa4 | 538 | } else if (strncmp(args[0].from, "lzo", 3) == 0) { |
a6fa6fae LZ |
539 | compress_type = "lzo"; |
540 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 541 | btrfs_set_opt(info->mount_opt, COMPRESS); |
bedb2cca AP |
542 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
543 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
2b0ce2c2 | 544 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
b7c47bbb | 545 | no_compress = 0; |
5c1aab1d NT |
546 | } else if (strcmp(args[0].from, "zstd") == 0) { |
547 | compress_type = "zstd"; | |
548 | info->compress_type = BTRFS_COMPRESS_ZSTD; | |
549 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
550 | btrfs_clear_opt(info->mount_opt, NODATACOW); | |
551 | btrfs_clear_opt(info->mount_opt, NODATASUM); | |
552 | btrfs_set_fs_incompat(info, COMPRESS_ZSTD); | |
553 | no_compress = 0; | |
063849ea AH |
554 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
555 | compress_type = "no"; | |
063849ea AH |
556 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
557 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
558 | compress_force = false; | |
b7c47bbb | 559 | no_compress++; |
261507a0 LZ |
560 | } else { |
561 | ret = -EINVAL; | |
562 | goto out; | |
563 | } | |
564 | ||
261507a0 | 565 | if (compress_force) { |
b7c47bbb | 566 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); |
143f3636 | 567 | } else { |
4027e0f4 WS |
568 | /* |
569 | * If we remount from compress-force=xxx to | |
570 | * compress=xxx, we need clear FORCE_COMPRESS | |
571 | * flag, otherwise, there is no way for users | |
572 | * to disable forcible compression separately. | |
573 | */ | |
574 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
a7e252af | 575 | } |
3cdde224 | 576 | if ((btrfs_test_opt(info, COMPRESS) && |
b7c47bbb TI |
577 | (info->compress_type != saved_compress_type || |
578 | compress_force != saved_compress_force)) || | |
3cdde224 | 579 | (!btrfs_test_opt(info, COMPRESS) && |
b7c47bbb | 580 | no_compress == 1)) { |
f51d2b59 | 581 | btrfs_info(info, "%s %s compression, level %d", |
b7c47bbb | 582 | (compress_force) ? "force" : "use", |
f51d2b59 | 583 | compress_type, info->compress_level); |
b7c47bbb TI |
584 | } |
585 | compress_force = false; | |
a555f810 | 586 | break; |
e18e4809 | 587 | case Opt_ssd: |
3cdde224 | 588 | btrfs_set_and_info(info, SSD, |
583b7231 | 589 | "enabling ssd optimizations"); |
951e7966 | 590 | btrfs_clear_opt(info->mount_opt, NOSSD); |
e18e4809 | 591 | break; |
451d7585 | 592 | case Opt_ssd_spread: |
583b7231 HK |
593 | btrfs_set_and_info(info, SSD, |
594 | "enabling ssd optimizations"); | |
3cdde224 | 595 | btrfs_set_and_info(info, SSD_SPREAD, |
583b7231 | 596 | "using spread ssd allocation scheme"); |
951e7966 | 597 | btrfs_clear_opt(info->mount_opt, NOSSD); |
451d7585 | 598 | break; |
3b30c22f | 599 | case Opt_nossd: |
583b7231 HK |
600 | btrfs_set_opt(info->mount_opt, NOSSD); |
601 | btrfs_clear_and_info(info, SSD, | |
602 | "not using ssd optimizations"); | |
62b8e077 HM |
603 | /* Fallthrough */ |
604 | case Opt_nossd_spread: | |
583b7231 HK |
605 | btrfs_clear_and_info(info, SSD_SPREAD, |
606 | "not using spread ssd allocation scheme"); | |
3b30c22f | 607 | break; |
842bef58 | 608 | case Opt_barrier: |
3cdde224 | 609 | btrfs_clear_and_info(info, NOBARRIER, |
07802534 | 610 | "turning on barriers"); |
842bef58 | 611 | break; |
21ad10cf | 612 | case Opt_nobarrier: |
3cdde224 | 613 | btrfs_set_and_info(info, NOBARRIER, |
07802534 | 614 | "turning off barriers"); |
21ad10cf | 615 | break; |
4543df7e | 616 | case Opt_thread_pool: |
2c334e87 WS |
617 | ret = match_int(&args[0], &intarg); |
618 | if (ret) { | |
619 | goto out; | |
f7b885be | 620 | } else if (intarg == 0) { |
2c334e87 WS |
621 | ret = -EINVAL; |
622 | goto out; | |
623 | } | |
f7b885be | 624 | info->thread_pool_size = intarg; |
4543df7e | 625 | break; |
6f568d35 | 626 | case Opt_max_inline: |
edf24abe CH |
627 | num = match_strdup(&args[0]); |
628 | if (num) { | |
91748467 | 629 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
630 | kfree(num); |
631 | ||
15ada040 | 632 | if (info->max_inline) { |
feb5f965 | 633 | info->max_inline = min_t(u64, |
15ada040 | 634 | info->max_inline, |
0b246afa | 635 | info->sectorsize); |
15ada040 | 636 | } |
0b246afa JM |
637 | btrfs_info(info, "max_inline at %llu", |
638 | info->max_inline); | |
2c334e87 WS |
639 | } else { |
640 | ret = -ENOMEM; | |
641 | goto out; | |
6f568d35 CM |
642 | } |
643 | break; | |
8f662a76 | 644 | case Opt_alloc_start: |
0d0c71b3 DS |
645 | btrfs_info(info, |
646 | "option alloc_start is obsolete, ignored"); | |
8f662a76 | 647 | break; |
bd0330ad | 648 | case Opt_acl: |
45ff35d6 | 649 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
1751e8a6 | 650 | info->sb->s_flags |= SB_POSIXACL; |
bd0330ad | 651 | break; |
45ff35d6 | 652 | #else |
0b246afa | 653 | btrfs_err(info, "support for ACL not compiled in!"); |
45ff35d6 GZ |
654 | ret = -EINVAL; |
655 | goto out; | |
656 | #endif | |
33268eaf | 657 | case Opt_noacl: |
1751e8a6 | 658 | info->sb->s_flags &= ~SB_POSIXACL; |
33268eaf | 659 | break; |
3a5e1404 | 660 | case Opt_notreelog: |
3cdde224 | 661 | btrfs_set_and_info(info, NOTREELOG, |
07802534 | 662 | "disabling tree log"); |
a88998f2 QW |
663 | break; |
664 | case Opt_treelog: | |
3cdde224 | 665 | btrfs_clear_and_info(info, NOTREELOG, |
07802534 | 666 | "enabling tree log"); |
3a5e1404 | 667 | break; |
fed8f166 | 668 | case Opt_norecovery: |
96da0919 | 669 | case Opt_nologreplay: |
3cdde224 | 670 | btrfs_set_and_info(info, NOLOGREPLAY, |
96da0919 QW |
671 | "disabling log replay at mount time"); |
672 | break; | |
dccae999 | 673 | case Opt_flushoncommit: |
3cdde224 | 674 | btrfs_set_and_info(info, FLUSHONCOMMIT, |
07802534 | 675 | "turning on flush-on-commit"); |
dccae999 | 676 | break; |
2c9ee856 | 677 | case Opt_noflushoncommit: |
3cdde224 | 678 | btrfs_clear_and_info(info, FLUSHONCOMMIT, |
07802534 | 679 | "turning off flush-on-commit"); |
2c9ee856 | 680 | break; |
97e728d4 | 681 | case Opt_ratio: |
2c334e87 | 682 | ret = match_int(&args[0], &intarg); |
764cb8b4 | 683 | if (ret) |
2c334e87 | 684 | goto out; |
764cb8b4 AJ |
685 | info->metadata_ratio = intarg; |
686 | btrfs_info(info, "metadata ratio %u", | |
687 | info->metadata_ratio); | |
97e728d4 | 688 | break; |
e244a0ae | 689 | case Opt_discard: |
3cdde224 | 690 | btrfs_set_and_info(info, DISCARD, |
07802534 | 691 | "turning on discard"); |
e244a0ae | 692 | break; |
e07a2ade | 693 | case Opt_nodiscard: |
3cdde224 | 694 | btrfs_clear_and_info(info, DISCARD, |
07802534 | 695 | "turning off discard"); |
e07a2ade | 696 | break; |
0af3d00b | 697 | case Opt_space_cache: |
70f6d82e OS |
698 | case Opt_space_cache_version: |
699 | if (token == Opt_space_cache || | |
700 | strcmp(args[0].from, "v1") == 0) { | |
0b246afa | 701 | btrfs_clear_opt(info->mount_opt, |
70f6d82e | 702 | FREE_SPACE_TREE); |
3cdde224 | 703 | btrfs_set_and_info(info, SPACE_CACHE, |
0b246afa | 704 | "enabling disk space caching"); |
70f6d82e | 705 | } else if (strcmp(args[0].from, "v2") == 0) { |
0b246afa | 706 | btrfs_clear_opt(info->mount_opt, |
70f6d82e | 707 | SPACE_CACHE); |
0b246afa | 708 | btrfs_set_and_info(info, FREE_SPACE_TREE, |
70f6d82e OS |
709 | "enabling free space tree"); |
710 | } else { | |
711 | ret = -EINVAL; | |
712 | goto out; | |
713 | } | |
0de90876 | 714 | break; |
f420ee1e SB |
715 | case Opt_rescan_uuid_tree: |
716 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); | |
717 | break; | |
73bc1876 | 718 | case Opt_no_space_cache: |
3cdde224 | 719 | if (btrfs_test_opt(info, SPACE_CACHE)) { |
0b246afa JM |
720 | btrfs_clear_and_info(info, SPACE_CACHE, |
721 | "disabling disk space caching"); | |
70f6d82e | 722 | } |
3cdde224 | 723 | if (btrfs_test_opt(info, FREE_SPACE_TREE)) { |
0b246afa JM |
724 | btrfs_clear_and_info(info, FREE_SPACE_TREE, |
725 | "disabling free space tree"); | |
70f6d82e | 726 | } |
73bc1876 | 727 | break; |
4b9465cb | 728 | case Opt_inode_cache: |
7e1876ac | 729 | btrfs_set_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 730 | "enabling inode map caching"); |
3818aea2 QW |
731 | break; |
732 | case Opt_noinode_cache: | |
7e1876ac | 733 | btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, |
07802534 | 734 | "disabling inode map caching"); |
4b9465cb | 735 | break; |
88c2ba3b | 736 | case Opt_clear_cache: |
3cdde224 | 737 | btrfs_set_and_info(info, CLEAR_CACHE, |
07802534 | 738 | "force clearing of disk cache"); |
0af3d00b | 739 | break; |
4260f7c7 SW |
740 | case Opt_user_subvol_rm_allowed: |
741 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
742 | break; | |
91435650 CM |
743 | case Opt_enospc_debug: |
744 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
745 | break; | |
53036293 QW |
746 | case Opt_noenospc_debug: |
747 | btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); | |
748 | break; | |
4cb5300b | 749 | case Opt_defrag: |
3cdde224 | 750 | btrfs_set_and_info(info, AUTO_DEFRAG, |
07802534 | 751 | "enabling auto defrag"); |
4cb5300b | 752 | break; |
fc0ca9af | 753 | case Opt_nodefrag: |
3cdde224 | 754 | btrfs_clear_and_info(info, AUTO_DEFRAG, |
07802534 | 755 | "disabling auto defrag"); |
fc0ca9af | 756 | break; |
af31f5e5 | 757 | case Opt_recovery: |
0b246afa | 758 | btrfs_warn(info, |
8dcddfa0 | 759 | "'recovery' is deprecated, use 'usebackuproot' instead"); |
acd43e3c | 760 | /* fall through */ |
8dcddfa0 | 761 | case Opt_usebackuproot: |
0b246afa | 762 | btrfs_info(info, |
8dcddfa0 QW |
763 | "trying to use backup root at mount time"); |
764 | btrfs_set_opt(info->mount_opt, USEBACKUPROOT); | |
af31f5e5 | 765 | break; |
9555c6c1 ID |
766 | case Opt_skip_balance: |
767 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
768 | break; | |
21adbd5c SB |
769 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
770 | case Opt_check_integrity_including_extent_data: | |
0b246afa | 771 | btrfs_info(info, |
efe120a0 | 772 | "enabling check integrity including extent data"); |
21adbd5c SB |
773 | btrfs_set_opt(info->mount_opt, |
774 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
775 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
776 | break; | |
777 | case Opt_check_integrity: | |
0b246afa | 778 | btrfs_info(info, "enabling check integrity"); |
21adbd5c SB |
779 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
780 | break; | |
781 | case Opt_check_integrity_print_mask: | |
2c334e87 | 782 | ret = match_int(&args[0], &intarg); |
02453bde | 783 | if (ret) |
2c334e87 | 784 | goto out; |
02453bde AJ |
785 | info->check_integrity_print_mask = intarg; |
786 | btrfs_info(info, "check_integrity_print_mask 0x%x", | |
787 | info->check_integrity_print_mask); | |
21adbd5c SB |
788 | break; |
789 | #else | |
790 | case Opt_check_integrity_including_extent_data: | |
791 | case Opt_check_integrity: | |
792 | case Opt_check_integrity_print_mask: | |
0b246afa JM |
793 | btrfs_err(info, |
794 | "support for check_integrity* not compiled in!"); | |
21adbd5c SB |
795 | ret = -EINVAL; |
796 | goto out; | |
797 | #endif | |
8c342930 JM |
798 | case Opt_fatal_errors: |
799 | if (strcmp(args[0].from, "panic") == 0) | |
800 | btrfs_set_opt(info->mount_opt, | |
801 | PANIC_ON_FATAL_ERROR); | |
802 | else if (strcmp(args[0].from, "bug") == 0) | |
803 | btrfs_clear_opt(info->mount_opt, | |
804 | PANIC_ON_FATAL_ERROR); | |
805 | else { | |
806 | ret = -EINVAL; | |
807 | goto out; | |
808 | } | |
809 | break; | |
8b87dc17 DS |
810 | case Opt_commit_interval: |
811 | intarg = 0; | |
812 | ret = match_int(&args[0], &intarg); | |
d3740608 | 813 | if (ret) |
8b87dc17 | 814 | goto out; |
d3740608 | 815 | if (intarg == 0) { |
0b246afa | 816 | btrfs_info(info, |
d3740608 | 817 | "using default commit interval %us", |
5d163e0e | 818 | BTRFS_DEFAULT_COMMIT_INTERVAL); |
d3740608 AJ |
819 | intarg = BTRFS_DEFAULT_COMMIT_INTERVAL; |
820 | } else if (intarg > 300) { | |
821 | btrfs_warn(info, "excessive commit interval %d", | |
822 | intarg); | |
8b87dc17 | 823 | } |
d3740608 | 824 | info->commit_interval = intarg; |
8b87dc17 | 825 | break; |
d0bd4560 JB |
826 | #ifdef CONFIG_BTRFS_DEBUG |
827 | case Opt_fragment_all: | |
0b246afa | 828 | btrfs_info(info, "fragmenting all space"); |
d0bd4560 JB |
829 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); |
830 | btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); | |
831 | break; | |
832 | case Opt_fragment_metadata: | |
0b246afa | 833 | btrfs_info(info, "fragmenting metadata"); |
d0bd4560 JB |
834 | btrfs_set_opt(info->mount_opt, |
835 | FRAGMENT_METADATA); | |
836 | break; | |
837 | case Opt_fragment_data: | |
0b246afa | 838 | btrfs_info(info, "fragmenting data"); |
d0bd4560 JB |
839 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); |
840 | break; | |
fb592373 JB |
841 | #endif |
842 | #ifdef CONFIG_BTRFS_FS_REF_VERIFY | |
843 | case Opt_ref_verify: | |
844 | btrfs_info(info, "doing ref verification"); | |
845 | btrfs_set_opt(info->mount_opt, REF_VERIFY); | |
846 | break; | |
d0bd4560 | 847 | #endif |
a7a3f7ca | 848 | case Opt_err: |
0b246afa | 849 | btrfs_info(info, "unrecognized mount option '%s'", p); |
a7a3f7ca SW |
850 | ret = -EINVAL; |
851 | goto out; | |
95e05289 | 852 | default: |
be20aa9d | 853 | break; |
95e05289 CM |
854 | } |
855 | } | |
96da0919 QW |
856 | check: |
857 | /* | |
858 | * Extra check for current option against current flag | |
859 | */ | |
1751e8a6 | 860 | if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & SB_RDONLY)) { |
0b246afa | 861 | btrfs_err(info, |
96da0919 QW |
862 | "nologreplay must be used with ro mount option"); |
863 | ret = -EINVAL; | |
864 | } | |
a7a3f7ca | 865 | out: |
0b246afa | 866 | if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && |
3cdde224 JM |
867 | !btrfs_test_opt(info, FREE_SPACE_TREE) && |
868 | !btrfs_test_opt(info, CLEAR_CACHE)) { | |
0b246afa | 869 | btrfs_err(info, "cannot disable free space tree"); |
70f6d82e OS |
870 | ret = -EINVAL; |
871 | ||
872 | } | |
3cdde224 | 873 | if (!ret && btrfs_test_opt(info, SPACE_CACHE)) |
0b246afa | 874 | btrfs_info(info, "disk space caching is enabled"); |
3cdde224 | 875 | if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) |
0b246afa | 876 | btrfs_info(info, "using free space tree"); |
a7a3f7ca | 877 | return ret; |
edf24abe CH |
878 | } |
879 | ||
880 | /* | |
881 | * Parse mount options that are required early in the mount process. | |
882 | * | |
883 | * All other options will be parsed on much later in the mount process and | |
884 | * only when we need to allocate a new super block. | |
885 | */ | |
97288f2c | 886 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
d7407606 | 887 | void *holder, struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
888 | { |
889 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 890 | char *device_name, *opts, *orig, *p; |
d7407606 MT |
891 | int error = 0; |
892 | ||
893 | if (!options) | |
894 | return 0; | |
895 | ||
896 | /* | |
897 | * strsep changes the string, duplicate it because btrfs_parse_options | |
898 | * gets called later | |
899 | */ | |
900 | opts = kstrdup(options, GFP_KERNEL); | |
901 | if (!opts) | |
902 | return -ENOMEM; | |
903 | orig = opts; | |
904 | ||
905 | while ((p = strsep(&opts, ",")) != NULL) { | |
906 | int token; | |
907 | ||
908 | if (!*p) | |
909 | continue; | |
910 | ||
911 | token = match_token(p, tokens, args); | |
912 | if (token == Opt_device) { | |
913 | device_name = match_strdup(&args[0]); | |
914 | if (!device_name) { | |
915 | error = -ENOMEM; | |
916 | goto out; | |
917 | } | |
918 | error = btrfs_scan_one_device(device_name, | |
919 | flags, holder, fs_devices); | |
920 | kfree(device_name); | |
921 | if (error) | |
922 | goto out; | |
923 | } | |
924 | } | |
925 | ||
926 | out: | |
927 | kfree(orig); | |
928 | return error; | |
929 | } | |
930 | ||
931 | /* | |
932 | * Parse mount options that are related to subvolume id | |
933 | * | |
934 | * The value is later passed to mount_subvol() | |
935 | */ | |
93b9bcdf GJ |
936 | static int btrfs_parse_subvol_options(const char *options, char **subvol_name, |
937 | u64 *subvol_objectid) | |
d7407606 MT |
938 | { |
939 | substring_t args[MAX_OPT_ARGS]; | |
940 | char *opts, *orig, *p; | |
edf24abe | 941 | int error = 0; |
ccb0e7d1 | 942 | u64 subvolid; |
edf24abe CH |
943 | |
944 | if (!options) | |
830c4adb | 945 | return 0; |
edf24abe CH |
946 | |
947 | /* | |
d7407606 MT |
948 | * strsep changes the string, duplicate it because |
949 | * btrfs_parse_early_options gets called later | |
edf24abe CH |
950 | */ |
951 | opts = kstrdup(options, GFP_KERNEL); | |
952 | if (!opts) | |
953 | return -ENOMEM; | |
3f3d0bc0 | 954 | orig = opts; |
edf24abe CH |
955 | |
956 | while ((p = strsep(&opts, ",")) != NULL) { | |
957 | int token; | |
958 | if (!*p) | |
959 | continue; | |
960 | ||
961 | token = match_token(p, tokens, args); | |
962 | switch (token) { | |
963 | case Opt_subvol: | |
a90e8b6f | 964 | kfree(*subvol_name); |
edf24abe | 965 | *subvol_name = match_strdup(&args[0]); |
2c334e87 WS |
966 | if (!*subvol_name) { |
967 | error = -ENOMEM; | |
968 | goto out; | |
969 | } | |
edf24abe | 970 | break; |
73f73415 | 971 | case Opt_subvolid: |
ccb0e7d1 AJ |
972 | error = match_u64(&args[0], &subvolid); |
973 | if (error) | |
2c334e87 | 974 | goto out; |
ccb0e7d1 AJ |
975 | |
976 | /* we want the original fs_tree */ | |
977 | if (subvolid == 0) | |
978 | subvolid = BTRFS_FS_TREE_OBJECTID; | |
979 | ||
980 | *subvol_objectid = subvolid; | |
73f73415 | 981 | break; |
e15d0542 | 982 | case Opt_subvolrootid: |
62e85577 | 983 | pr_warn("BTRFS: 'subvolrootid' mount option is deprecated and has no effect\n"); |
e15d0542 | 984 | break; |
edf24abe CH |
985 | default: |
986 | break; | |
987 | } | |
988 | } | |
989 | ||
830c4adb | 990 | out: |
3f3d0bc0 | 991 | kfree(orig); |
edf24abe | 992 | return error; |
95e05289 CM |
993 | } |
994 | ||
05dbe683 OS |
995 | static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, |
996 | u64 subvol_objectid) | |
73f73415 | 997 | { |
815745cf | 998 | struct btrfs_root *root = fs_info->tree_root; |
05dbe683 OS |
999 | struct btrfs_root *fs_root; |
1000 | struct btrfs_root_ref *root_ref; | |
1001 | struct btrfs_inode_ref *inode_ref; | |
1002 | struct btrfs_key key; | |
1003 | struct btrfs_path *path = NULL; | |
1004 | char *name = NULL, *ptr; | |
1005 | u64 dirid; | |
1006 | int len; | |
1007 | int ret; | |
1008 | ||
1009 | path = btrfs_alloc_path(); | |
1010 | if (!path) { | |
1011 | ret = -ENOMEM; | |
1012 | goto err; | |
1013 | } | |
1014 | path->leave_spinning = 1; | |
1015 | ||
3ec83621 | 1016 | name = kmalloc(PATH_MAX, GFP_KERNEL); |
05dbe683 OS |
1017 | if (!name) { |
1018 | ret = -ENOMEM; | |
1019 | goto err; | |
1020 | } | |
1021 | ptr = name + PATH_MAX - 1; | |
1022 | ptr[0] = '\0'; | |
73f73415 JB |
1023 | |
1024 | /* | |
05dbe683 OS |
1025 | * Walk up the subvolume trees in the tree of tree roots by root |
1026 | * backrefs until we hit the top-level subvolume. | |
73f73415 | 1027 | */ |
05dbe683 OS |
1028 | while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
1029 | key.objectid = subvol_objectid; | |
1030 | key.type = BTRFS_ROOT_BACKREF_KEY; | |
1031 | key.offset = (u64)-1; | |
1032 | ||
1033 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1034 | if (ret < 0) { | |
1035 | goto err; | |
1036 | } else if (ret > 0) { | |
1037 | ret = btrfs_previous_item(root, path, subvol_objectid, | |
1038 | BTRFS_ROOT_BACKREF_KEY); | |
1039 | if (ret < 0) { | |
1040 | goto err; | |
1041 | } else if (ret > 0) { | |
1042 | ret = -ENOENT; | |
1043 | goto err; | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1048 | subvol_objectid = key.offset; | |
1049 | ||
1050 | root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1051 | struct btrfs_root_ref); | |
1052 | len = btrfs_root_ref_name_len(path->nodes[0], root_ref); | |
1053 | ptr -= len + 1; | |
1054 | if (ptr < name) { | |
1055 | ret = -ENAMETOOLONG; | |
1056 | goto err; | |
1057 | } | |
1058 | read_extent_buffer(path->nodes[0], ptr + 1, | |
1059 | (unsigned long)(root_ref + 1), len); | |
1060 | ptr[0] = '/'; | |
1061 | dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); | |
1062 | btrfs_release_path(path); | |
1063 | ||
1064 | key.objectid = subvol_objectid; | |
1065 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1066 | key.offset = (u64)-1; | |
1067 | fs_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
1068 | if (IS_ERR(fs_root)) { | |
1069 | ret = PTR_ERR(fs_root); | |
1070 | goto err; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * Walk up the filesystem tree by inode refs until we hit the | |
1075 | * root directory. | |
1076 | */ | |
1077 | while (dirid != BTRFS_FIRST_FREE_OBJECTID) { | |
1078 | key.objectid = dirid; | |
1079 | key.type = BTRFS_INODE_REF_KEY; | |
1080 | key.offset = (u64)-1; | |
1081 | ||
1082 | ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); | |
1083 | if (ret < 0) { | |
1084 | goto err; | |
1085 | } else if (ret > 0) { | |
1086 | ret = btrfs_previous_item(fs_root, path, dirid, | |
1087 | BTRFS_INODE_REF_KEY); | |
1088 | if (ret < 0) { | |
1089 | goto err; | |
1090 | } else if (ret > 0) { | |
1091 | ret = -ENOENT; | |
1092 | goto err; | |
1093 | } | |
1094 | } | |
1095 | ||
1096 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1097 | dirid = key.offset; | |
1098 | ||
1099 | inode_ref = btrfs_item_ptr(path->nodes[0], | |
1100 | path->slots[0], | |
1101 | struct btrfs_inode_ref); | |
1102 | len = btrfs_inode_ref_name_len(path->nodes[0], | |
1103 | inode_ref); | |
1104 | ptr -= len + 1; | |
1105 | if (ptr < name) { | |
1106 | ret = -ENAMETOOLONG; | |
1107 | goto err; | |
1108 | } | |
1109 | read_extent_buffer(path->nodes[0], ptr + 1, | |
1110 | (unsigned long)(inode_ref + 1), len); | |
1111 | ptr[0] = '/'; | |
1112 | btrfs_release_path(path); | |
1113 | } | |
73f73415 JB |
1114 | } |
1115 | ||
05dbe683 OS |
1116 | btrfs_free_path(path); |
1117 | if (ptr == name + PATH_MAX - 1) { | |
1118 | name[0] = '/'; | |
1119 | name[1] = '\0'; | |
1120 | } else { | |
1121 | memmove(name, ptr, name + PATH_MAX - ptr); | |
1122 | } | |
1123 | return name; | |
1124 | ||
1125 | err: | |
1126 | btrfs_free_path(path); | |
1127 | kfree(name); | |
1128 | return ERR_PTR(ret); | |
1129 | } | |
1130 | ||
1131 | static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) | |
1132 | { | |
1133 | struct btrfs_root *root = fs_info->tree_root; | |
1134 | struct btrfs_dir_item *di; | |
1135 | struct btrfs_path *path; | |
1136 | struct btrfs_key location; | |
1137 | u64 dir_id; | |
1138 | ||
73f73415 JB |
1139 | path = btrfs_alloc_path(); |
1140 | if (!path) | |
05dbe683 | 1141 | return -ENOMEM; |
73f73415 JB |
1142 | path->leave_spinning = 1; |
1143 | ||
1144 | /* | |
1145 | * Find the "default" dir item which points to the root item that we | |
1146 | * will mount by default if we haven't been given a specific subvolume | |
1147 | * to mount. | |
1148 | */ | |
815745cf | 1149 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 1150 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
1151 | if (IS_ERR(di)) { |
1152 | btrfs_free_path(path); | |
05dbe683 | 1153 | return PTR_ERR(di); |
b0839166 | 1154 | } |
73f73415 JB |
1155 | if (!di) { |
1156 | /* | |
1157 | * Ok the default dir item isn't there. This is weird since | |
1158 | * it's always been there, but don't freak out, just try and | |
05dbe683 | 1159 | * mount the top-level subvolume. |
73f73415 JB |
1160 | */ |
1161 | btrfs_free_path(path); | |
05dbe683 OS |
1162 | *objectid = BTRFS_FS_TREE_OBJECTID; |
1163 | return 0; | |
73f73415 JB |
1164 | } |
1165 | ||
1166 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
1167 | btrfs_free_path(path); | |
05dbe683 OS |
1168 | *objectid = location.objectid; |
1169 | return 0; | |
73f73415 JB |
1170 | } |
1171 | ||
d397712b | 1172 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 1173 | struct btrfs_fs_devices *fs_devices, |
56e033a7 | 1174 | void *data) |
75dfe396 | 1175 | { |
d397712b | 1176 | struct inode *inode; |
815745cf | 1177 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 1178 | struct btrfs_key key; |
39279cc3 | 1179 | int err; |
a429e513 | 1180 | |
39279cc3 CM |
1181 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
1182 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
1183 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 1184 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 1185 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 1186 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 1187 | sb->s_time_gran = 1; |
0eda294d | 1188 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
1751e8a6 | 1189 | sb->s_flags |= SB_POSIXACL; |
49cf6f45 | 1190 | #endif |
357fdad0 | 1191 | sb->s_flags |= SB_I_VERSION; |
da2f0f74 | 1192 | sb->s_iflags |= SB_I_CGROUPWB; |
9e11ceee JK |
1193 | |
1194 | err = super_setup_bdi(sb); | |
1195 | if (err) { | |
1196 | btrfs_err(fs_info, "super_setup_bdi failed"); | |
1197 | return err; | |
1198 | } | |
1199 | ||
ad2b2c80 AV |
1200 | err = open_ctree(sb, fs_devices, (char *)data); |
1201 | if (err) { | |
ab8d0fc4 | 1202 | btrfs_err(fs_info, "open_ctree failed"); |
ad2b2c80 | 1203 | return err; |
a429e513 CM |
1204 | } |
1205 | ||
5d4f98a2 YZ |
1206 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
1207 | key.type = BTRFS_INODE_ITEM_KEY; | |
1208 | key.offset = 0; | |
98c7089c | 1209 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
1210 | if (IS_ERR(inode)) { |
1211 | err = PTR_ERR(inode); | |
39279cc3 | 1212 | goto fail_close; |
f254e52c | 1213 | } |
f254e52c | 1214 | |
48fde701 AV |
1215 | sb->s_root = d_make_root(inode); |
1216 | if (!sb->s_root) { | |
39279cc3 CM |
1217 | err = -ENOMEM; |
1218 | goto fail_close; | |
f254e52c | 1219 | } |
58176a96 | 1220 | |
90a887c9 | 1221 | cleancache_init_fs(sb); |
1751e8a6 | 1222 | sb->s_flags |= SB_ACTIVE; |
2619ba1f | 1223 | return 0; |
39279cc3 CM |
1224 | |
1225 | fail_close: | |
6bccf3ab | 1226 | close_ctree(fs_info); |
39279cc3 | 1227 | return err; |
2619ba1f CM |
1228 | } |
1229 | ||
6bf13c0c | 1230 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
1231 | { |
1232 | struct btrfs_trans_handle *trans; | |
815745cf AV |
1233 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1234 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 1235 | |
bc074524 | 1236 | trace_btrfs_sync_fs(fs_info, wait); |
1abe9b8a | 1237 | |
39279cc3 | 1238 | if (!wait) { |
815745cf | 1239 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
1240 | return 0; |
1241 | } | |
771ed689 | 1242 | |
6374e57a | 1243 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
771ed689 | 1244 | |
d4edf39b | 1245 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 1246 | if (IS_ERR(trans)) { |
354aa0fb | 1247 | /* no transaction, don't bother */ |
6b5fe46d DS |
1248 | if (PTR_ERR(trans) == -ENOENT) { |
1249 | /* | |
1250 | * Exit unless we have some pending changes | |
1251 | * that need to go through commit | |
1252 | */ | |
1253 | if (fs_info->pending_changes == 0) | |
1254 | return 0; | |
a53f4f8e QW |
1255 | /* |
1256 | * A non-blocking test if the fs is frozen. We must not | |
1257 | * start a new transaction here otherwise a deadlock | |
1258 | * happens. The pending operations are delayed to the | |
1259 | * next commit after thawing. | |
1260 | */ | |
a7e3c5f2 RP |
1261 | if (sb_start_write_trylock(sb)) |
1262 | sb_end_write(sb); | |
a53f4f8e QW |
1263 | else |
1264 | return 0; | |
6b5fe46d | 1265 | trans = btrfs_start_transaction(root, 0); |
6b5fe46d | 1266 | } |
98bd5c54 DS |
1267 | if (IS_ERR(trans)) |
1268 | return PTR_ERR(trans); | |
60376ce4 | 1269 | } |
3a45bb20 | 1270 | return btrfs_commit_transaction(trans); |
2c90e5d6 CM |
1271 | } |
1272 | ||
34c80b1d | 1273 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 1274 | { |
815745cf | 1275 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
0f628c63 | 1276 | const char *compress_type; |
a9572a15 | 1277 | |
3cdde224 | 1278 | if (btrfs_test_opt(info, DEGRADED)) |
a9572a15 | 1279 | seq_puts(seq, ",degraded"); |
3cdde224 | 1280 | if (btrfs_test_opt(info, NODATASUM)) |
a9572a15 | 1281 | seq_puts(seq, ",nodatasum"); |
3cdde224 | 1282 | if (btrfs_test_opt(info, NODATACOW)) |
a9572a15 | 1283 | seq_puts(seq, ",nodatacow"); |
3cdde224 | 1284 | if (btrfs_test_opt(info, NOBARRIER)) |
a9572a15 | 1285 | seq_puts(seq, ",nobarrier"); |
95ac567a | 1286 | if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) |
c1c9ff7c | 1287 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
a9572a15 EP |
1288 | if (info->thread_pool_size != min_t(unsigned long, |
1289 | num_online_cpus() + 2, 8)) | |
f7b885be | 1290 | seq_printf(seq, ",thread_pool=%u", info->thread_pool_size); |
3cdde224 | 1291 | if (btrfs_test_opt(info, COMPRESS)) { |
0f628c63 | 1292 | compress_type = btrfs_compress_type2str(info->compress_type); |
3cdde224 | 1293 | if (btrfs_test_opt(info, FORCE_COMPRESS)) |
200da64e TI |
1294 | seq_printf(seq, ",compress-force=%s", compress_type); |
1295 | else | |
1296 | seq_printf(seq, ",compress=%s", compress_type); | |
f51d2b59 | 1297 | if (info->compress_level) |
fa4d885a | 1298 | seq_printf(seq, ":%d", info->compress_level); |
200da64e | 1299 | } |
3cdde224 | 1300 | if (btrfs_test_opt(info, NOSSD)) |
c289811c | 1301 | seq_puts(seq, ",nossd"); |
3cdde224 | 1302 | if (btrfs_test_opt(info, SSD_SPREAD)) |
451d7585 | 1303 | seq_puts(seq, ",ssd_spread"); |
3cdde224 | 1304 | else if (btrfs_test_opt(info, SSD)) |
a9572a15 | 1305 | seq_puts(seq, ",ssd"); |
3cdde224 | 1306 | if (btrfs_test_opt(info, NOTREELOG)) |
6b65c5c6 | 1307 | seq_puts(seq, ",notreelog"); |
3cdde224 | 1308 | if (btrfs_test_opt(info, NOLOGREPLAY)) |
96da0919 | 1309 | seq_puts(seq, ",nologreplay"); |
3cdde224 | 1310 | if (btrfs_test_opt(info, FLUSHONCOMMIT)) |
6b65c5c6 | 1311 | seq_puts(seq, ",flushoncommit"); |
3cdde224 | 1312 | if (btrfs_test_opt(info, DISCARD)) |
20a5239a | 1313 | seq_puts(seq, ",discard"); |
1751e8a6 | 1314 | if (!(info->sb->s_flags & SB_POSIXACL)) |
a9572a15 | 1315 | seq_puts(seq, ",noacl"); |
3cdde224 | 1316 | if (btrfs_test_opt(info, SPACE_CACHE)) |
200da64e | 1317 | seq_puts(seq, ",space_cache"); |
3cdde224 | 1318 | else if (btrfs_test_opt(info, FREE_SPACE_TREE)) |
70f6d82e | 1319 | seq_puts(seq, ",space_cache=v2"); |
73bc1876 | 1320 | else |
8965593e | 1321 | seq_puts(seq, ",nospace_cache"); |
3cdde224 | 1322 | if (btrfs_test_opt(info, RESCAN_UUID_TREE)) |
f420ee1e | 1323 | seq_puts(seq, ",rescan_uuid_tree"); |
3cdde224 | 1324 | if (btrfs_test_opt(info, CLEAR_CACHE)) |
200da64e | 1325 | seq_puts(seq, ",clear_cache"); |
3cdde224 | 1326 | if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) |
200da64e | 1327 | seq_puts(seq, ",user_subvol_rm_allowed"); |
3cdde224 | 1328 | if (btrfs_test_opt(info, ENOSPC_DEBUG)) |
0942caa3 | 1329 | seq_puts(seq, ",enospc_debug"); |
3cdde224 | 1330 | if (btrfs_test_opt(info, AUTO_DEFRAG)) |
0942caa3 | 1331 | seq_puts(seq, ",autodefrag"); |
3cdde224 | 1332 | if (btrfs_test_opt(info, INODE_MAP_CACHE)) |
0942caa3 | 1333 | seq_puts(seq, ",inode_cache"); |
3cdde224 | 1334 | if (btrfs_test_opt(info, SKIP_BALANCE)) |
9555c6c1 | 1335 | seq_puts(seq, ",skip_balance"); |
8507d216 | 1336 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
3cdde224 | 1337 | if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) |
8507d216 | 1338 | seq_puts(seq, ",check_int_data"); |
3cdde224 | 1339 | else if (btrfs_test_opt(info, CHECK_INTEGRITY)) |
8507d216 WS |
1340 | seq_puts(seq, ",check_int"); |
1341 | if (info->check_integrity_print_mask) | |
1342 | seq_printf(seq, ",check_int_print_mask=%d", | |
1343 | info->check_integrity_print_mask); | |
1344 | #endif | |
1345 | if (info->metadata_ratio) | |
764cb8b4 | 1346 | seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio); |
3cdde224 | 1347 | if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) |
8c342930 | 1348 | seq_puts(seq, ",fatal_errors=panic"); |
8b87dc17 | 1349 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
d3740608 | 1350 | seq_printf(seq, ",commit=%u", info->commit_interval); |
d0bd4560 | 1351 | #ifdef CONFIG_BTRFS_DEBUG |
3cdde224 | 1352 | if (btrfs_test_opt(info, FRAGMENT_DATA)) |
d0bd4560 | 1353 | seq_puts(seq, ",fragment=data"); |
3cdde224 | 1354 | if (btrfs_test_opt(info, FRAGMENT_METADATA)) |
d0bd4560 JB |
1355 | seq_puts(seq, ",fragment=metadata"); |
1356 | #endif | |
fb592373 JB |
1357 | if (btrfs_test_opt(info, REF_VERIFY)) |
1358 | seq_puts(seq, ",ref_verify"); | |
c8d3fe02 OS |
1359 | seq_printf(seq, ",subvolid=%llu", |
1360 | BTRFS_I(d_inode(dentry))->root->root_key.objectid); | |
1361 | seq_puts(seq, ",subvol="); | |
1362 | seq_dentry(seq, dentry, " \t\n\\"); | |
a9572a15 EP |
1363 | return 0; |
1364 | } | |
1365 | ||
a061fc8d | 1366 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 1367 | { |
815745cf AV |
1368 | struct btrfs_fs_info *p = data; |
1369 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 1370 | |
815745cf | 1371 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
1372 | } |
1373 | ||
450ba0ea JB |
1374 | static int btrfs_set_super(struct super_block *s, void *data) |
1375 | { | |
6de1d09d AV |
1376 | int err = set_anon_super(s, data); |
1377 | if (!err) | |
1378 | s->s_fs_info = data; | |
1379 | return err; | |
4b82d6e4 Y |
1380 | } |
1381 | ||
f9d9ef62 DS |
1382 | /* |
1383 | * subvolumes are identified by ino 256 | |
1384 | */ | |
1385 | static inline int is_subvolume_inode(struct inode *inode) | |
1386 | { | |
1387 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1388 | return 1; | |
1389 | return 0; | |
1390 | } | |
1391 | ||
bb289b7b | 1392 | static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, |
5bedc48a | 1393 | const char *device_name, struct vfsmount *mnt) |
830c4adb | 1394 | { |
830c4adb | 1395 | struct dentry *root; |
fa330659 | 1396 | int ret; |
830c4adb | 1397 | |
05dbe683 OS |
1398 | if (!subvol_name) { |
1399 | if (!subvol_objectid) { | |
1400 | ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), | |
1401 | &subvol_objectid); | |
1402 | if (ret) { | |
1403 | root = ERR_PTR(ret); | |
1404 | goto out; | |
1405 | } | |
1406 | } | |
1407 | subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), | |
1408 | subvol_objectid); | |
1409 | if (IS_ERR(subvol_name)) { | |
1410 | root = ERR_CAST(subvol_name); | |
1411 | subvol_name = NULL; | |
1412 | goto out; | |
1413 | } | |
1414 | ||
1415 | } | |
1416 | ||
ea441d11 | 1417 | root = mount_subtree(mnt, subvol_name); |
fa330659 OS |
1418 | /* mount_subtree() drops our reference on the vfsmount. */ |
1419 | mnt = NULL; | |
830c4adb | 1420 | |
bb289b7b | 1421 | if (!IS_ERR(root)) { |
ea441d11 | 1422 | struct super_block *s = root->d_sb; |
ab8d0fc4 | 1423 | struct btrfs_fs_info *fs_info = btrfs_sb(s); |
bb289b7b OS |
1424 | struct inode *root_inode = d_inode(root); |
1425 | u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; | |
1426 | ||
1427 | ret = 0; | |
1428 | if (!is_subvolume_inode(root_inode)) { | |
ab8d0fc4 | 1429 | btrfs_err(fs_info, "'%s' is not a valid subvolume", |
bb289b7b OS |
1430 | subvol_name); |
1431 | ret = -EINVAL; | |
1432 | } | |
1433 | if (subvol_objectid && root_objectid != subvol_objectid) { | |
05dbe683 OS |
1434 | /* |
1435 | * This will also catch a race condition where a | |
1436 | * subvolume which was passed by ID is renamed and | |
1437 | * another subvolume is renamed over the old location. | |
1438 | */ | |
ab8d0fc4 JM |
1439 | btrfs_err(fs_info, |
1440 | "subvol '%s' does not match subvolid %llu", | |
1441 | subvol_name, subvol_objectid); | |
bb289b7b OS |
1442 | ret = -EINVAL; |
1443 | } | |
1444 | if (ret) { | |
1445 | dput(root); | |
1446 | root = ERR_PTR(ret); | |
1447 | deactivate_locked_super(s); | |
1448 | } | |
f9d9ef62 DS |
1449 | } |
1450 | ||
fa330659 OS |
1451 | out: |
1452 | mntput(mnt); | |
fa330659 | 1453 | kfree(subvol_name); |
830c4adb JB |
1454 | return root; |
1455 | } | |
450ba0ea | 1456 | |
f667aef6 QW |
1457 | static int parse_security_options(char *orig_opts, |
1458 | struct security_mnt_opts *sec_opts) | |
1459 | { | |
1460 | char *secdata = NULL; | |
1461 | int ret = 0; | |
1462 | ||
1463 | secdata = alloc_secdata(); | |
1464 | if (!secdata) | |
1465 | return -ENOMEM; | |
1466 | ret = security_sb_copy_data(orig_opts, secdata); | |
1467 | if (ret) { | |
1468 | free_secdata(secdata); | |
1469 | return ret; | |
1470 | } | |
1471 | ret = security_sb_parse_opts_str(secdata, sec_opts); | |
1472 | free_secdata(secdata); | |
1473 | return ret; | |
1474 | } | |
1475 | ||
1476 | static int setup_security_options(struct btrfs_fs_info *fs_info, | |
1477 | struct super_block *sb, | |
1478 | struct security_mnt_opts *sec_opts) | |
1479 | { | |
1480 | int ret = 0; | |
1481 | ||
1482 | /* | |
1483 | * Call security_sb_set_mnt_opts() to check whether new sec_opts | |
1484 | * is valid. | |
1485 | */ | |
1486 | ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); | |
1487 | if (ret) | |
1488 | return ret; | |
1489 | ||
a43bb39b | 1490 | #ifdef CONFIG_SECURITY |
f667aef6 QW |
1491 | if (!fs_info->security_opts.num_mnt_opts) { |
1492 | /* first time security setup, copy sec_opts to fs_info */ | |
1493 | memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); | |
1494 | } else { | |
1495 | /* | |
180e4d47 LB |
1496 | * Since SELinux (the only one supporting security_mnt_opts) |
1497 | * does NOT support changing context during remount/mount of | |
1498 | * the same sb, this must be the same or part of the same | |
1499 | * security options, just free it. | |
f667aef6 QW |
1500 | */ |
1501 | security_free_mnt_opts(sec_opts); | |
1502 | } | |
a43bb39b | 1503 | #endif |
f667aef6 QW |
1504 | return ret; |
1505 | } | |
1506 | ||
312c89fb MT |
1507 | /* |
1508 | * Find a superblock for the given device / mount point. | |
1509 | * | |
1510 | * Note: This is based on mount_bdev from fs/super.c with a few additions | |
1511 | * for multiple device setup. Make sure to keep it in sync. | |
1512 | */ | |
72fa39f5 MT |
1513 | static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, |
1514 | int flags, const char *device_name, void *data) | |
1515 | { | |
1516 | struct block_device *bdev = NULL; | |
1517 | struct super_block *s; | |
1518 | struct btrfs_fs_devices *fs_devices = NULL; | |
1519 | struct btrfs_fs_info *fs_info = NULL; | |
1520 | struct security_mnt_opts new_sec_opts; | |
1521 | fmode_t mode = FMODE_READ; | |
72fa39f5 MT |
1522 | int error = 0; |
1523 | ||
1524 | if (!(flags & SB_RDONLY)) | |
1525 | mode |= FMODE_WRITE; | |
1526 | ||
1527 | error = btrfs_parse_early_options(data, mode, fs_type, | |
72fa39f5 MT |
1528 | &fs_devices); |
1529 | if (error) { | |
72fa39f5 MT |
1530 | return ERR_PTR(error); |
1531 | } | |
1532 | ||
1533 | security_init_mnt_opts(&new_sec_opts); | |
1534 | if (data) { | |
1535 | error = parse_security_options(data, &new_sec_opts); | |
1536 | if (error) | |
1537 | return ERR_PTR(error); | |
1538 | } | |
1539 | ||
1540 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); | |
1541 | if (error) | |
1542 | goto error_sec_opts; | |
1543 | ||
1544 | /* | |
1545 | * Setup a dummy root and fs_info for test/set super. This is because | |
1546 | * we don't actually fill this stuff out until open_ctree, but we need | |
1547 | * it for searching for existing supers, so this lets us do that and | |
1548 | * then open_ctree will properly initialize everything later. | |
1549 | */ | |
a8fd1f71 | 1550 | fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL); |
72fa39f5 MT |
1551 | if (!fs_info) { |
1552 | error = -ENOMEM; | |
1553 | goto error_sec_opts; | |
1554 | } | |
1555 | ||
1556 | fs_info->fs_devices = fs_devices; | |
1557 | ||
1558 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); | |
1559 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); | |
1560 | security_init_mnt_opts(&fs_info->security_opts); | |
1561 | if (!fs_info->super_copy || !fs_info->super_for_commit) { | |
1562 | error = -ENOMEM; | |
1563 | goto error_fs_info; | |
1564 | } | |
1565 | ||
1566 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1567 | if (error) | |
1568 | goto error_fs_info; | |
1569 | ||
1570 | if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) { | |
1571 | error = -EACCES; | |
1572 | goto error_close_devices; | |
1573 | } | |
1574 | ||
1575 | bdev = fs_devices->latest_bdev; | |
1576 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC, | |
1577 | fs_info); | |
1578 | if (IS_ERR(s)) { | |
1579 | error = PTR_ERR(s); | |
1580 | goto error_close_devices; | |
1581 | } | |
1582 | ||
1583 | if (s->s_root) { | |
1584 | btrfs_close_devices(fs_devices); | |
1585 | free_fs_info(fs_info); | |
1586 | if ((flags ^ s->s_flags) & SB_RDONLY) | |
1587 | error = -EBUSY; | |
1588 | } else { | |
1589 | snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); | |
1590 | btrfs_sb(s)->bdev_holder = fs_type; | |
1591 | error = btrfs_fill_super(s, fs_devices, data); | |
1592 | } | |
1593 | if (error) { | |
1594 | deactivate_locked_super(s); | |
1595 | goto error_sec_opts; | |
1596 | } | |
1597 | ||
1598 | fs_info = btrfs_sb(s); | |
1599 | error = setup_security_options(fs_info, s, &new_sec_opts); | |
1600 | if (error) { | |
1601 | deactivate_locked_super(s); | |
1602 | goto error_sec_opts; | |
1603 | } | |
1604 | ||
1605 | return dget(s->s_root); | |
1606 | ||
1607 | error_close_devices: | |
1608 | btrfs_close_devices(fs_devices); | |
1609 | error_fs_info: | |
1610 | free_fs_info(fs_info); | |
1611 | error_sec_opts: | |
1612 | security_free_mnt_opts(&new_sec_opts); | |
1613 | return ERR_PTR(error); | |
1614 | } | |
312c89fb | 1615 | |
edf24abe | 1616 | /* |
312c89fb | 1617 | * Mount function which is called by VFS layer. |
edf24abe | 1618 | * |
312c89fb MT |
1619 | * In order to allow mounting a subvolume directly, btrfs uses mount_subtree() |
1620 | * which needs vfsmount* of device's root (/). This means device's root has to | |
1621 | * be mounted internally in any case. | |
1622 | * | |
1623 | * Operation flow: | |
1624 | * 1. Parse subvol id related options for later use in mount_subvol(). | |
1625 | * | |
1626 | * 2. Mount device's root (/) by calling vfs_kern_mount(). | |
1627 | * | |
1628 | * NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the | |
1629 | * first place. In order to avoid calling btrfs_mount() again, we use | |
1630 | * different file_system_type which is not registered to VFS by | |
1631 | * register_filesystem() (btrfs_root_fs_type). As a result, | |
1632 | * btrfs_mount_root() is called. The return value will be used by | |
1633 | * mount_subtree() in mount_subvol(). | |
1634 | * | |
1635 | * 3. Call mount_subvol() to get the dentry of subvolume. Since there is | |
1636 | * "btrfs subvolume set-default", mount_subvol() is called always. | |
edf24abe | 1637 | */ |
061dbc6b | 1638 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1639 | const char *device_name, void *data) |
4b82d6e4 | 1640 | { |
312c89fb MT |
1641 | struct vfsmount *mnt_root; |
1642 | struct dentry *root; | |
97288f2c | 1643 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1644 | char *subvol_name = NULL; |
1645 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
1646 | int error = 0; |
1647 | ||
1751e8a6 | 1648 | if (!(flags & SB_RDONLY)) |
97288f2c CH |
1649 | mode |= FMODE_WRITE; |
1650 | ||
93b9bcdf GJ |
1651 | error = btrfs_parse_subvol_options(data, &subvol_name, |
1652 | &subvol_objectid); | |
f23c8af8 ID |
1653 | if (error) { |
1654 | kfree(subvol_name); | |
061dbc6b | 1655 | return ERR_PTR(error); |
f23c8af8 | 1656 | } |
edf24abe | 1657 | |
312c89fb MT |
1658 | /* mount device's root (/) */ |
1659 | mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data); | |
1660 | if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) { | |
1661 | if (flags & SB_RDONLY) { | |
1662 | mnt_root = vfs_kern_mount(&btrfs_root_fs_type, | |
1663 | flags & ~SB_RDONLY, device_name, data); | |
1664 | } else { | |
1665 | mnt_root = vfs_kern_mount(&btrfs_root_fs_type, | |
1666 | flags | SB_RDONLY, device_name, data); | |
1667 | if (IS_ERR(mnt_root)) { | |
1668 | root = ERR_CAST(mnt_root); | |
1669 | goto out; | |
1670 | } | |
4b82d6e4 | 1671 | |
312c89fb MT |
1672 | down_write(&mnt_root->mnt_sb->s_umount); |
1673 | error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL); | |
1674 | up_write(&mnt_root->mnt_sb->s_umount); | |
1675 | if (error < 0) { | |
1676 | root = ERR_PTR(error); | |
1677 | mntput(mnt_root); | |
1678 | goto out; | |
1679 | } | |
1680 | } | |
f667aef6 | 1681 | } |
312c89fb MT |
1682 | if (IS_ERR(mnt_root)) { |
1683 | root = ERR_CAST(mnt_root); | |
1684 | goto out; | |
f667aef6 | 1685 | } |
4b82d6e4 | 1686 | |
312c89fb | 1687 | /* mount_subvol() will free subvol_name and mnt_root */ |
5bedc48a | 1688 | root = mount_subvol(subvol_name, subvol_objectid, device_name, mnt_root); |
4b82d6e4 | 1689 | |
312c89fb MT |
1690 | out: |
1691 | return root; | |
4b82d6e4 | 1692 | } |
2e635a27 | 1693 | |
0d2450ab | 1694 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
f7b885be | 1695 | u32 new_pool_size, u32 old_pool_size) |
0d2450ab ST |
1696 | { |
1697 | if (new_pool_size == old_pool_size) | |
1698 | return; | |
1699 | ||
1700 | fs_info->thread_pool_size = new_pool_size; | |
1701 | ||
efe120a0 | 1702 | btrfs_info(fs_info, "resize thread pool %d -> %d", |
0d2450ab ST |
1703 | old_pool_size, new_pool_size); |
1704 | ||
5cdc7ad3 | 1705 | btrfs_workqueue_set_max(fs_info->workers, new_pool_size); |
afe3d242 | 1706 | btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); |
a8c93d4e | 1707 | btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); |
e66f0bb1 | 1708 | btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); |
fccb5d86 QW |
1709 | btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); |
1710 | btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); | |
1711 | btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, | |
1712 | new_pool_size); | |
1713 | btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); | |
1714 | btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); | |
5b3bc44e | 1715 | btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); |
736cfa15 | 1716 | btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); |
0339ef2f QW |
1717 | btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, |
1718 | new_pool_size); | |
0d2450ab ST |
1719 | } |
1720 | ||
f42a34b2 | 1721 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
dc81cdc5 MX |
1722 | { |
1723 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
f42a34b2 | 1724 | } |
dc81cdc5 | 1725 | |
f42a34b2 MX |
1726 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
1727 | unsigned long old_opts, int flags) | |
1728 | { | |
dc81cdc5 MX |
1729 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1730 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1751e8a6 | 1731 | (flags & SB_RDONLY))) { |
dc81cdc5 MX |
1732 | /* wait for any defraggers to finish */ |
1733 | wait_event(fs_info->transaction_wait, | |
1734 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1751e8a6 | 1735 | if (flags & SB_RDONLY) |
dc81cdc5 MX |
1736 | sync_filesystem(fs_info->sb); |
1737 | } | |
1738 | } | |
1739 | ||
1740 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
1741 | unsigned long old_opts) | |
1742 | { | |
1743 | /* | |
180e4d47 LB |
1744 | * We need to cleanup all defragable inodes if the autodefragment is |
1745 | * close or the filesystem is read only. | |
dc81cdc5 MX |
1746 | */ |
1747 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && | |
bc98a42c | 1748 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) { |
dc81cdc5 MX |
1749 | btrfs_cleanup_defrag_inodes(fs_info); |
1750 | } | |
1751 | ||
1752 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); | |
1753 | } | |
1754 | ||
c146afad YZ |
1755 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1756 | { | |
815745cf AV |
1757 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1758 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1759 | unsigned old_flags = sb->s_flags; |
1760 | unsigned long old_opts = fs_info->mount_opt; | |
1761 | unsigned long old_compress_type = fs_info->compress_type; | |
1762 | u64 old_max_inline = fs_info->max_inline; | |
f7b885be | 1763 | u32 old_thread_pool_size = fs_info->thread_pool_size; |
d612ac59 | 1764 | u32 old_metadata_ratio = fs_info->metadata_ratio; |
c146afad YZ |
1765 | int ret; |
1766 | ||
02b9984d | 1767 | sync_filesystem(sb); |
f42a34b2 | 1768 | btrfs_remount_prepare(fs_info); |
dc81cdc5 | 1769 | |
f667aef6 QW |
1770 | if (data) { |
1771 | struct security_mnt_opts new_sec_opts; | |
1772 | ||
1773 | security_init_mnt_opts(&new_sec_opts); | |
1774 | ret = parse_security_options(data, &new_sec_opts); | |
1775 | if (ret) | |
1776 | goto restore; | |
1777 | ret = setup_security_options(fs_info, sb, | |
1778 | &new_sec_opts); | |
1779 | if (ret) { | |
1780 | security_free_mnt_opts(&new_sec_opts); | |
1781 | goto restore; | |
1782 | } | |
1783 | } | |
1784 | ||
2ff7e61e | 1785 | ret = btrfs_parse_options(fs_info, data, *flags); |
891f41cb | 1786 | if (ret) |
49b25e05 | 1787 | goto restore; |
b288052e | 1788 | |
f42a34b2 | 1789 | btrfs_remount_begin(fs_info, old_opts, *flags); |
0d2450ab ST |
1790 | btrfs_resize_thread_pool(fs_info, |
1791 | fs_info->thread_pool_size, old_thread_pool_size); | |
1792 | ||
1751e8a6 | 1793 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
dc81cdc5 | 1794 | goto out; |
c146afad | 1795 | |
1751e8a6 | 1796 | if (*flags & SB_RDONLY) { |
8dabb742 SB |
1797 | /* |
1798 | * this also happens on 'umount -rf' or on shutdown, when | |
1799 | * the filesystem is busy. | |
1800 | */ | |
21c7e756 | 1801 | cancel_work_sync(&fs_info->async_reclaim_work); |
361c093d SB |
1802 | |
1803 | /* wait for the uuid_scan task to finish */ | |
1804 | down(&fs_info->uuid_tree_rescan_sem); | |
1805 | /* avoid complains from lockdep et al. */ | |
1806 | up(&fs_info->uuid_tree_rescan_sem); | |
1807 | ||
1751e8a6 | 1808 | sb->s_flags |= SB_RDONLY; |
c146afad | 1809 | |
e44163e1 | 1810 | /* |
1751e8a6 | 1811 | * Setting SB_RDONLY will put the cleaner thread to |
e44163e1 JM |
1812 | * sleep at the next loop if it's already active. |
1813 | * If it's already asleep, we'll leave unused block | |
1814 | * groups on disk until we're mounted read-write again | |
1815 | * unless we clean them up here. | |
1816 | */ | |
e44163e1 | 1817 | btrfs_delete_unused_bgs(fs_info); |
e44163e1 | 1818 | |
8dabb742 SB |
1819 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1820 | btrfs_scrub_cancel(fs_info); | |
061594ef | 1821 | btrfs_pause_balance(fs_info); |
8dabb742 | 1822 | |
6bccf3ab | 1823 | ret = btrfs_commit_super(fs_info); |
49b25e05 JM |
1824 | if (ret) |
1825 | goto restore; | |
c146afad | 1826 | } else { |
0b246afa | 1827 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
6ef3de9c | 1828 | btrfs_err(fs_info, |
efe120a0 | 1829 | "Remounting read-write after error is not allowed"); |
6ef3de9c DS |
1830 | ret = -EINVAL; |
1831 | goto restore; | |
1832 | } | |
8a3db184 | 1833 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1834 | ret = -EACCES; |
1835 | goto restore; | |
8a3db184 | 1836 | } |
2b82032c | 1837 | |
6528b99d | 1838 | if (!btrfs_check_rw_degradable(fs_info, NULL)) { |
efe120a0 FH |
1839 | btrfs_warn(fs_info, |
1840 | "too many missing devices, writeable remount is not allowed"); | |
292fd7fc SB |
1841 | ret = -EACCES; |
1842 | goto restore; | |
1843 | } | |
1844 | ||
8a3db184 | 1845 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1846 | ret = -EINVAL; |
1847 | goto restore; | |
8a3db184 | 1848 | } |
c146afad | 1849 | |
815745cf | 1850 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1851 | if (ret) |
1852 | goto restore; | |
c146afad | 1853 | |
d68fc57b | 1854 | /* recover relocation */ |
5f316481 | 1855 | mutex_lock(&fs_info->cleaner_mutex); |
d68fc57b | 1856 | ret = btrfs_recover_relocation(root); |
5f316481 | 1857 | mutex_unlock(&fs_info->cleaner_mutex); |
49b25e05 JM |
1858 | if (ret) |
1859 | goto restore; | |
c146afad | 1860 | |
2b6ba629 ID |
1861 | ret = btrfs_resume_balance_async(fs_info); |
1862 | if (ret) | |
1863 | goto restore; | |
1864 | ||
8dabb742 SB |
1865 | ret = btrfs_resume_dev_replace_async(fs_info); |
1866 | if (ret) { | |
efe120a0 | 1867 | btrfs_warn(fs_info, "failed to resume dev_replace"); |
8dabb742 SB |
1868 | goto restore; |
1869 | } | |
94aebfb2 | 1870 | |
6c6b5a39 AS |
1871 | btrfs_qgroup_rescan_resume(fs_info); |
1872 | ||
94aebfb2 | 1873 | if (!fs_info->uuid_root) { |
efe120a0 | 1874 | btrfs_info(fs_info, "creating UUID tree"); |
94aebfb2 JB |
1875 | ret = btrfs_create_uuid_tree(fs_info); |
1876 | if (ret) { | |
5d163e0e JM |
1877 | btrfs_warn(fs_info, |
1878 | "failed to create the UUID tree %d", | |
1879 | ret); | |
94aebfb2 JB |
1880 | goto restore; |
1881 | } | |
1882 | } | |
1751e8a6 | 1883 | sb->s_flags &= ~SB_RDONLY; |
90c711ab | 1884 | |
afcdd129 | 1885 | set_bit(BTRFS_FS_OPEN, &fs_info->flags); |
c146afad | 1886 | } |
dc81cdc5 | 1887 | out: |
2c6a92b0 | 1888 | wake_up_process(fs_info->transaction_kthread); |
dc81cdc5 | 1889 | btrfs_remount_cleanup(fs_info, old_opts); |
c146afad | 1890 | return 0; |
49b25e05 JM |
1891 | |
1892 | restore: | |
1751e8a6 | 1893 | /* We've hit an error - don't reset SB_RDONLY */ |
bc98a42c | 1894 | if (sb_rdonly(sb)) |
1751e8a6 | 1895 | old_flags |= SB_RDONLY; |
49b25e05 JM |
1896 | sb->s_flags = old_flags; |
1897 | fs_info->mount_opt = old_opts; | |
1898 | fs_info->compress_type = old_compress_type; | |
1899 | fs_info->max_inline = old_max_inline; | |
0d2450ab ST |
1900 | btrfs_resize_thread_pool(fs_info, |
1901 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 | 1902 | fs_info->metadata_ratio = old_metadata_ratio; |
dc81cdc5 | 1903 | btrfs_remount_cleanup(fs_info, old_opts); |
49b25e05 | 1904 | return ret; |
c146afad YZ |
1905 | } |
1906 | ||
bcd53741 AJ |
1907 | /* Used to sort the devices by max_avail(descending sort) */ |
1908 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1909 | const void *dev_info2) | |
1910 | { | |
1911 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1912 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1913 | return -1; | |
1914 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1915 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1916 | return 1; | |
1917 | else | |
1918 | return 0; | |
1919 | } | |
1920 | ||
1921 | /* | |
1922 | * sort the devices by max_avail, in which max free extent size of each device | |
1923 | * is stored.(Descending Sort) | |
1924 | */ | |
1925 | static inline void btrfs_descending_sort_devices( | |
1926 | struct btrfs_device_info *devices, | |
1927 | size_t nr_devices) | |
1928 | { | |
1929 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1930 | btrfs_cmp_device_free_bytes, NULL); | |
1931 | } | |
1932 | ||
6d07bcec MX |
1933 | /* |
1934 | * The helper to calc the free space on the devices that can be used to store | |
1935 | * file data. | |
1936 | */ | |
6bccf3ab JM |
1937 | static int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, |
1938 | u64 *free_bytes) | |
6d07bcec | 1939 | { |
6d07bcec MX |
1940 | struct btrfs_device_info *devices_info; |
1941 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1942 | struct btrfs_device *device; | |
1943 | u64 skip_space; | |
1944 | u64 type; | |
1945 | u64 avail_space; | |
6d07bcec | 1946 | u64 min_stripe_size; |
39fb26c3 | 1947 | int min_stripes = 1, num_stripes = 1; |
6d07bcec | 1948 | int i = 0, nr_devices; |
6d07bcec | 1949 | |
7e33fd99 | 1950 | /* |
01327610 | 1951 | * We aren't under the device list lock, so this is racy-ish, but good |
7e33fd99 JB |
1952 | * enough for our purposes. |
1953 | */ | |
b772a86e | 1954 | nr_devices = fs_info->fs_devices->open_devices; |
7e33fd99 JB |
1955 | if (!nr_devices) { |
1956 | smp_mb(); | |
1957 | nr_devices = fs_info->fs_devices->open_devices; | |
1958 | ASSERT(nr_devices); | |
1959 | if (!nr_devices) { | |
1960 | *free_bytes = 0; | |
1961 | return 0; | |
1962 | } | |
1963 | } | |
6d07bcec | 1964 | |
d9b0d9ba | 1965 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
6a44517d | 1966 | GFP_KERNEL); |
6d07bcec MX |
1967 | if (!devices_info) |
1968 | return -ENOMEM; | |
1969 | ||
01327610 | 1970 | /* calc min stripe number for data space allocation */ |
1b86826d | 1971 | type = btrfs_data_alloc_profile(fs_info); |
39fb26c3 | 1972 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1973 | min_stripes = 2; |
39fb26c3 MX |
1974 | num_stripes = nr_devices; |
1975 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1976 | min_stripes = 2; |
39fb26c3 MX |
1977 | num_stripes = 2; |
1978 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1979 | min_stripes = 4; |
39fb26c3 MX |
1980 | num_stripes = 4; |
1981 | } | |
6d07bcec MX |
1982 | |
1983 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1984 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1985 | else | |
1986 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1987 | ||
7e33fd99 JB |
1988 | rcu_read_lock(); |
1989 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { | |
e12c9621 AJ |
1990 | if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, |
1991 | &device->dev_state) || | |
401e29c1 AJ |
1992 | !device->bdev || |
1993 | test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) | |
6d07bcec MX |
1994 | continue; |
1995 | ||
7e33fd99 JB |
1996 | if (i >= nr_devices) |
1997 | break; | |
1998 | ||
6d07bcec MX |
1999 | avail_space = device->total_bytes - device->bytes_used; |
2000 | ||
2001 | /* align with stripe_len */ | |
f8c269d7 | 2002 | avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); |
6d07bcec MX |
2003 | avail_space *= BTRFS_STRIPE_LEN; |
2004 | ||
2005 | /* | |
01327610 | 2006 | * In order to avoid overwriting the superblock on the drive, |
6d07bcec MX |
2007 | * btrfs starts at an offset of at least 1MB when doing chunk |
2008 | * allocation. | |
2009 | */ | |
ee22184b | 2010 | skip_space = SZ_1M; |
6d07bcec | 2011 | |
6d07bcec MX |
2012 | /* |
2013 | * we can use the free space in [0, skip_space - 1], subtract | |
2014 | * it from the total. | |
2015 | */ | |
2016 | if (avail_space && avail_space >= skip_space) | |
2017 | avail_space -= skip_space; | |
2018 | else | |
2019 | avail_space = 0; | |
2020 | ||
2021 | if (avail_space < min_stripe_size) | |
2022 | continue; | |
2023 | ||
2024 | devices_info[i].dev = device; | |
2025 | devices_info[i].max_avail = avail_space; | |
2026 | ||
2027 | i++; | |
2028 | } | |
7e33fd99 | 2029 | rcu_read_unlock(); |
6d07bcec MX |
2030 | |
2031 | nr_devices = i; | |
2032 | ||
2033 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
2034 | ||
2035 | i = nr_devices - 1; | |
2036 | avail_space = 0; | |
2037 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
2038 | if (num_stripes > nr_devices) |
2039 | num_stripes = nr_devices; | |
2040 | ||
6d07bcec MX |
2041 | if (devices_info[i].max_avail >= min_stripe_size) { |
2042 | int j; | |
2043 | u64 alloc_size; | |
2044 | ||
39fb26c3 | 2045 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 2046 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 2047 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
2048 | devices_info[j].max_avail -= alloc_size; |
2049 | } | |
2050 | i--; | |
2051 | nr_devices--; | |
2052 | } | |
2053 | ||
2054 | kfree(devices_info); | |
2055 | *free_bytes = avail_space; | |
2056 | return 0; | |
2057 | } | |
2058 | ||
ba7b6e62 DS |
2059 | /* |
2060 | * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. | |
2061 | * | |
2062 | * If there's a redundant raid level at DATA block groups, use the respective | |
2063 | * multiplier to scale the sizes. | |
2064 | * | |
2065 | * Unused device space usage is based on simulating the chunk allocator | |
0d0c71b3 DS |
2066 | * algorithm that respects the device sizes and order of allocations. This is |
2067 | * a close approximation of the actual use but there are other factors that may | |
2068 | * change the result (like a new metadata chunk). | |
ba7b6e62 | 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 | |
bd4d1088 | 2089 | rcu_read_lock(); |
89a55897 | 2090 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec | 2091 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
ba7b6e62 DS |
2092 | int i; |
2093 | ||
6d07bcec MX |
2094 | total_free_data += found->disk_total - found->disk_used; |
2095 | total_free_data -= | |
2096 | btrfs_account_ro_block_groups_free_space(found); | |
ba7b6e62 DS |
2097 | |
2098 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
2099 | if (!list_empty(&found->block_groups[i])) { | |
2100 | switch (i) { | |
2101 | case BTRFS_RAID_DUP: | |
2102 | case BTRFS_RAID_RAID1: | |
2103 | case BTRFS_RAID_RAID10: | |
2104 | factor = 2; | |
2105 | } | |
2106 | } | |
2107 | } | |
6d07bcec | 2108 | } |
ae02d1bd LB |
2109 | |
2110 | /* | |
2111 | * Metadata in mixed block goup profiles are accounted in data | |
2112 | */ | |
2113 | if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
2114 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) | |
2115 | mixed = 1; | |
2116 | else | |
2117 | total_free_meta += found->disk_total - | |
2118 | found->disk_used; | |
2119 | } | |
6d07bcec | 2120 | |
b742bb82 | 2121 | total_used += found->disk_used; |
89a55897 | 2122 | } |
ba7b6e62 | 2123 | |
bd4d1088 JB |
2124 | rcu_read_unlock(); |
2125 | ||
ba7b6e62 DS |
2126 | buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); |
2127 | buf->f_blocks >>= bits; | |
2128 | buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); | |
2129 | ||
2130 | /* Account global block reserve as used, it's in logical size already */ | |
2131 | spin_lock(&block_rsv->lock); | |
41b34acc LB |
2132 | /* Mixed block groups accounting is not byte-accurate, avoid overflow */ |
2133 | if (buf->f_bfree >= block_rsv->size >> bits) | |
2134 | buf->f_bfree -= block_rsv->size >> bits; | |
2135 | else | |
2136 | buf->f_bfree = 0; | |
ba7b6e62 DS |
2137 | spin_unlock(&block_rsv->lock); |
2138 | ||
0d95c1be | 2139 | buf->f_bavail = div_u64(total_free_data, factor); |
6bccf3ab | 2140 | ret = btrfs_calc_avail_data_space(fs_info, &total_free_data); |
7e33fd99 | 2141 | if (ret) |
6d07bcec | 2142 | return ret; |
ba7b6e62 | 2143 | buf->f_bavail += div_u64(total_free_data, factor); |
6d07bcec | 2144 | buf->f_bavail = buf->f_bavail >> bits; |
d397712b | 2145 | |
ca8a51b3 DS |
2146 | /* |
2147 | * We calculate the remaining metadata space minus global reserve. If | |
2148 | * this is (supposedly) smaller than zero, there's no space. But this | |
2149 | * does not hold in practice, the exhausted state happens where's still | |
2150 | * some positive delta. So we apply some guesswork and compare the | |
2151 | * delta to a 4M threshold. (Practically observed delta was ~2M.) | |
2152 | * | |
2153 | * We probably cannot calculate the exact threshold value because this | |
2154 | * depends on the internal reservations requested by various | |
2155 | * operations, so some operations that consume a few metadata will | |
2156 | * succeed even if the Avail is zero. But this is better than the other | |
2157 | * way around. | |
2158 | */ | |
d4417e22 | 2159 | thresh = SZ_4M; |
ca8a51b3 | 2160 | |
ae02d1bd | 2161 | if (!mixed && total_free_meta - thresh < block_rsv->size) |
ca8a51b3 DS |
2162 | buf->f_bavail = 0; |
2163 | ||
ba7b6e62 DS |
2164 | buf->f_type = BTRFS_SUPER_MAGIC; |
2165 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2166 | buf->f_namelen = BTRFS_NAME_LEN; | |
2167 | ||
9d03632e | 2168 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 2169 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
2170 | on a big-endian or little-endian host */ |
2171 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
2172 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 | 2173 | /* Mask in the root object ID too, to disambiguate subvols */ |
2b0143b5 DH |
2174 | buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; |
2175 | buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; | |
32d48fa1 | 2176 | |
8fd17795 CM |
2177 | return 0; |
2178 | } | |
b5133862 | 2179 | |
aea52e19 AV |
2180 | static void btrfs_kill_super(struct super_block *sb) |
2181 | { | |
815745cf | 2182 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 2183 | kill_anon_super(sb); |
d22ca7de | 2184 | free_fs_info(fs_info); |
aea52e19 AV |
2185 | } |
2186 | ||
2e635a27 CM |
2187 | static struct file_system_type btrfs_fs_type = { |
2188 | .owner = THIS_MODULE, | |
2189 | .name = "btrfs", | |
061dbc6b | 2190 | .mount = btrfs_mount, |
aea52e19 | 2191 | .kill_sb = btrfs_kill_super, |
f667aef6 | 2192 | .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, |
2e635a27 | 2193 | }; |
72fa39f5 MT |
2194 | |
2195 | static struct file_system_type btrfs_root_fs_type = { | |
2196 | .owner = THIS_MODULE, | |
2197 | .name = "btrfs", | |
2198 | .mount = btrfs_mount_root, | |
2199 | .kill_sb = btrfs_kill_super, | |
2200 | .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, | |
2201 | }; | |
2202 | ||
7f78e035 | 2203 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 2204 | |
d8620958 TVB |
2205 | static int btrfs_control_open(struct inode *inode, struct file *file) |
2206 | { | |
2207 | /* | |
2208 | * The control file's private_data is used to hold the | |
2209 | * transaction when it is started and is used to keep | |
2210 | * track of whether a transaction is already in progress. | |
2211 | */ | |
2212 | file->private_data = NULL; | |
2213 | return 0; | |
2214 | } | |
2215 | ||
d352ac68 CM |
2216 | /* |
2217 | * used by btrfsctl to scan devices when no FS is mounted | |
2218 | */ | |
8a4b83cc CM |
2219 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
2220 | unsigned long arg) | |
2221 | { | |
2222 | struct btrfs_ioctl_vol_args *vol; | |
2223 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 2224 | int ret = -ENOTTY; |
8a4b83cc | 2225 | |
e441d54d CM |
2226 | if (!capable(CAP_SYS_ADMIN)) |
2227 | return -EPERM; | |
2228 | ||
dae7b665 LZ |
2229 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
2230 | if (IS_ERR(vol)) | |
2231 | return PTR_ERR(vol); | |
c071fcfd | 2232 | |
8a4b83cc CM |
2233 | switch (cmd) { |
2234 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 2235 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
312c89fb | 2236 | &btrfs_root_fs_type, &fs_devices); |
8a4b83cc | 2237 | break; |
02db0844 JB |
2238 | case BTRFS_IOC_DEVICES_READY: |
2239 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
312c89fb | 2240 | &btrfs_root_fs_type, &fs_devices); |
02db0844 JB |
2241 | if (ret) |
2242 | break; | |
2243 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
2244 | break; | |
c5868f83 | 2245 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 2246 | ret = btrfs_ioctl_get_supported_features((void __user*)arg); |
c5868f83 | 2247 | break; |
8a4b83cc | 2248 | } |
dae7b665 | 2249 | |
8a4b83cc | 2250 | kfree(vol); |
f819d837 | 2251 | return ret; |
8a4b83cc CM |
2252 | } |
2253 | ||
0176260f | 2254 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 2255 | { |
354aa0fb | 2256 | struct btrfs_trans_handle *trans; |
0b246afa JM |
2257 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
2258 | struct btrfs_root *root = fs_info->tree_root; | |
354aa0fb | 2259 | |
fac03c8d | 2260 | set_bit(BTRFS_FS_FROZEN, &fs_info->flags); |
9e7cc91a WX |
2261 | /* |
2262 | * We don't need a barrier here, we'll wait for any transaction that | |
2263 | * could be in progress on other threads (and do delayed iputs that | |
2264 | * we want to avoid on a frozen filesystem), or do the commit | |
2265 | * ourselves. | |
2266 | */ | |
d4edf39b | 2267 | trans = btrfs_attach_transaction_barrier(root); |
354aa0fb MX |
2268 | if (IS_ERR(trans)) { |
2269 | /* no transaction, don't bother */ | |
2270 | if (PTR_ERR(trans) == -ENOENT) | |
2271 | return 0; | |
2272 | return PTR_ERR(trans); | |
2273 | } | |
3a45bb20 | 2274 | return btrfs_commit_transaction(trans); |
ed0dab6b Y |
2275 | } |
2276 | ||
9e7cc91a WX |
2277 | static int btrfs_unfreeze(struct super_block *sb) |
2278 | { | |
fac03c8d DS |
2279 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
2280 | ||
2281 | clear_bit(BTRFS_FS_FROZEN, &fs_info->flags); | |
9e7cc91a WX |
2282 | return 0; |
2283 | } | |
2284 | ||
9c5085c1 JB |
2285 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
2286 | { | |
2287 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
2288 | struct btrfs_fs_devices *cur_devices; | |
2289 | struct btrfs_device *dev, *first_dev = NULL; | |
2290 | struct list_head *head; | |
2291 | struct rcu_string *name; | |
2292 | ||
88c14590 DS |
2293 | /* |
2294 | * Lightweight locking of the devices. We should not need | |
2295 | * device_list_mutex here as we only read the device data and the list | |
2296 | * is protected by RCU. Even if a device is deleted during the list | |
2297 | * traversals, we'll get valid data, the freeing callback will wait at | |
2298 | * least until until the rcu_read_unlock. | |
2299 | */ | |
2300 | rcu_read_lock(); | |
9c5085c1 JB |
2301 | cur_devices = fs_info->fs_devices; |
2302 | while (cur_devices) { | |
2303 | head = &cur_devices->devices; | |
88c14590 | 2304 | list_for_each_entry_rcu(dev, head, dev_list) { |
e6e674bd | 2305 | if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) |
aa9ddcd4 | 2306 | continue; |
0aeb8a6e AJ |
2307 | if (!dev->name) |
2308 | continue; | |
9c5085c1 JB |
2309 | if (!first_dev || dev->devid < first_dev->devid) |
2310 | first_dev = dev; | |
2311 | } | |
2312 | cur_devices = cur_devices->seed; | |
2313 | } | |
2314 | ||
2315 | if (first_dev) { | |
9c5085c1 JB |
2316 | name = rcu_dereference(first_dev->name); |
2317 | seq_escape(m, name->str, " \t\n\\"); | |
9c5085c1 JB |
2318 | } else { |
2319 | WARN_ON(1); | |
2320 | } | |
88c14590 | 2321 | rcu_read_unlock(); |
9c5085c1 JB |
2322 | return 0; |
2323 | } | |
2324 | ||
b87221de | 2325 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 2326 | .drop_inode = btrfs_drop_inode, |
bd555975 | 2327 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 2328 | .put_super = btrfs_put_super, |
d5719762 | 2329 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 2330 | .show_options = btrfs_show_options, |
9c5085c1 | 2331 | .show_devname = btrfs_show_devname, |
4730a4bc | 2332 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
2333 | .alloc_inode = btrfs_alloc_inode, |
2334 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2335 | .statfs = btrfs_statfs, |
c146afad | 2336 | .remount_fs = btrfs_remount, |
0176260f | 2337 | .freeze_fs = btrfs_freeze, |
9e7cc91a | 2338 | .unfreeze_fs = btrfs_unfreeze, |
e20d96d6 | 2339 | }; |
a9218f6b CM |
2340 | |
2341 | static const struct file_operations btrfs_ctl_fops = { | |
d8620958 | 2342 | .open = btrfs_control_open, |
a9218f6b CM |
2343 | .unlocked_ioctl = btrfs_control_ioctl, |
2344 | .compat_ioctl = btrfs_control_ioctl, | |
2345 | .owner = THIS_MODULE, | |
6038f373 | 2346 | .llseek = noop_llseek, |
a9218f6b CM |
2347 | }; |
2348 | ||
2349 | static struct miscdevice btrfs_misc = { | |
578454ff | 2350 | .minor = BTRFS_MINOR, |
a9218f6b CM |
2351 | .name = "btrfs-control", |
2352 | .fops = &btrfs_ctl_fops | |
2353 | }; | |
2354 | ||
578454ff KS |
2355 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
2356 | MODULE_ALIAS("devname:btrfs-control"); | |
2357 | ||
f5c29bd9 | 2358 | static int __init btrfs_interface_init(void) |
a9218f6b CM |
2359 | { |
2360 | return misc_register(&btrfs_misc); | |
2361 | } | |
2362 | ||
e67c718b | 2363 | static __cold void btrfs_interface_exit(void) |
a9218f6b | 2364 | { |
f368ed60 | 2365 | misc_deregister(&btrfs_misc); |
a9218f6b CM |
2366 | } |
2367 | ||
f5c29bd9 | 2368 | static void __init btrfs_print_mod_info(void) |
85965600 | 2369 | { |
edf57cbf | 2370 | static const char options[] = "" |
85965600 DS |
2371 | #ifdef CONFIG_BTRFS_DEBUG |
2372 | ", debug=on" | |
2373 | #endif | |
79556c3d SB |
2374 | #ifdef CONFIG_BTRFS_ASSERT |
2375 | ", assert=on" | |
2376 | #endif | |
85965600 DS |
2377 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
2378 | ", integrity-checker=on" | |
fb592373 JB |
2379 | #endif |
2380 | #ifdef CONFIG_BTRFS_FS_REF_VERIFY | |
2381 | ", ref-verify=on" | |
85965600 | 2382 | #endif |
edf57cbf BVA |
2383 | ; |
2384 | pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options); | |
85965600 DS |
2385 | } |
2386 | ||
2e635a27 CM |
2387 | static int __init init_btrfs_fs(void) |
2388 | { | |
2c90e5d6 | 2389 | int err; |
58176a96 | 2390 | |
63541927 FDBM |
2391 | btrfs_props_init(); |
2392 | ||
58176a96 JB |
2393 | err = btrfs_init_sysfs(); |
2394 | if (err) | |
9678c543 | 2395 | return err; |
58176a96 | 2396 | |
143bede5 | 2397 | btrfs_init_compress(); |
d1310b2e | 2398 | |
261507a0 LZ |
2399 | err = btrfs_init_cachep(); |
2400 | if (err) | |
2401 | goto free_compress; | |
2402 | ||
d1310b2e | 2403 | err = extent_io_init(); |
2f4cbe64 WB |
2404 | if (err) |
2405 | goto free_cachep; | |
2406 | ||
d1310b2e CM |
2407 | err = extent_map_init(); |
2408 | if (err) | |
2409 | goto free_extent_io; | |
2410 | ||
6352b91d | 2411 | err = ordered_data_init(); |
2f4cbe64 WB |
2412 | if (err) |
2413 | goto free_extent_map; | |
c8b97818 | 2414 | |
6352b91d MX |
2415 | err = btrfs_delayed_inode_init(); |
2416 | if (err) | |
2417 | goto free_ordered_data; | |
2418 | ||
9247f317 | 2419 | err = btrfs_auto_defrag_init(); |
16cdcec7 MX |
2420 | if (err) |
2421 | goto free_delayed_inode; | |
2422 | ||
78a6184a | 2423 | err = btrfs_delayed_ref_init(); |
9247f317 MX |
2424 | if (err) |
2425 | goto free_auto_defrag; | |
2426 | ||
b9e9a6cb WS |
2427 | err = btrfs_prelim_ref_init(); |
2428 | if (err) | |
af13b492 | 2429 | goto free_delayed_ref; |
b9e9a6cb | 2430 | |
97eb6b69 | 2431 | err = btrfs_end_io_wq_init(); |
78a6184a | 2432 | if (err) |
af13b492 | 2433 | goto free_prelim_ref; |
78a6184a | 2434 | |
97eb6b69 DS |
2435 | err = btrfs_interface_init(); |
2436 | if (err) | |
2437 | goto free_end_io_wq; | |
2438 | ||
e565d4b9 JS |
2439 | btrfs_init_lockdep(); |
2440 | ||
8ae1af3c | 2441 | btrfs_print_mod_info(); |
dc11dd5d JB |
2442 | |
2443 | err = btrfs_run_sanity_tests(); | |
2444 | if (err) | |
2445 | goto unregister_ioctl; | |
2446 | ||
2447 | err = register_filesystem(&btrfs_fs_type); | |
2448 | if (err) | |
2449 | goto unregister_ioctl; | |
74255aa0 | 2450 | |
2f4cbe64 WB |
2451 | return 0; |
2452 | ||
a9218f6b CM |
2453 | unregister_ioctl: |
2454 | btrfs_interface_exit(); | |
97eb6b69 DS |
2455 | free_end_io_wq: |
2456 | btrfs_end_io_wq_exit(); | |
b9e9a6cb WS |
2457 | free_prelim_ref: |
2458 | btrfs_prelim_ref_exit(); | |
78a6184a MX |
2459 | free_delayed_ref: |
2460 | btrfs_delayed_ref_exit(); | |
9247f317 MX |
2461 | free_auto_defrag: |
2462 | btrfs_auto_defrag_exit(); | |
16cdcec7 MX |
2463 | free_delayed_inode: |
2464 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
2465 | free_ordered_data: |
2466 | ordered_data_exit(); | |
2f4cbe64 WB |
2467 | free_extent_map: |
2468 | extent_map_exit(); | |
d1310b2e CM |
2469 | free_extent_io: |
2470 | extent_io_exit(); | |
2f4cbe64 WB |
2471 | free_cachep: |
2472 | btrfs_destroy_cachep(); | |
261507a0 LZ |
2473 | free_compress: |
2474 | btrfs_exit_compress(); | |
2f4cbe64 | 2475 | btrfs_exit_sysfs(); |
9678c543 | 2476 | |
2f4cbe64 | 2477 | return err; |
2e635a27 CM |
2478 | } |
2479 | ||
2480 | static void __exit exit_btrfs_fs(void) | |
2481 | { | |
39279cc3 | 2482 | btrfs_destroy_cachep(); |
78a6184a | 2483 | btrfs_delayed_ref_exit(); |
9247f317 | 2484 | btrfs_auto_defrag_exit(); |
16cdcec7 | 2485 | btrfs_delayed_inode_exit(); |
b9e9a6cb | 2486 | btrfs_prelim_ref_exit(); |
6352b91d | 2487 | ordered_data_exit(); |
a52d9a80 | 2488 | extent_map_exit(); |
d1310b2e | 2489 | extent_io_exit(); |
a9218f6b | 2490 | btrfs_interface_exit(); |
5ed5f588 | 2491 | btrfs_end_io_wq_exit(); |
2e635a27 | 2492 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 2493 | btrfs_exit_sysfs(); |
8a4b83cc | 2494 | btrfs_cleanup_fs_uuids(); |
261507a0 | 2495 | btrfs_exit_compress(); |
2e635a27 CM |
2496 | } |
2497 | ||
60efa5eb | 2498 | late_initcall(init_btrfs_fs); |
2e635a27 CM |
2499 | module_exit(exit_btrfs_fs) |
2500 | ||
2501 | MODULE_LICENSE("GPL"); |