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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
4b82d6e4 | 19 | #include <linux/blkdev.h> |
2e635a27 | 20 | #include <linux/module.h> |
e20d96d6 | 21 | #include <linux/buffer_head.h> |
2e635a27 CM |
22 | #include <linux/fs.h> |
23 | #include <linux/pagemap.h> | |
24 | #include <linux/highmem.h> | |
25 | #include <linux/time.h> | |
26 | #include <linux/init.h> | |
a9572a15 | 27 | #include <linux/seq_file.h> |
2e635a27 | 28 | #include <linux/string.h> |
2e635a27 | 29 | #include <linux/backing-dev.h> |
4b82d6e4 | 30 | #include <linux/mount.h> |
dee26a9f | 31 | #include <linux/mpage.h> |
75dfe396 CM |
32 | #include <linux/swap.h> |
33 | #include <linux/writeback.h> | |
8fd17795 | 34 | #include <linux/statfs.h> |
08607c1b | 35 | #include <linux/compat.h> |
95e05289 | 36 | #include <linux/parser.h> |
c59f8951 | 37 | #include <linux/ctype.h> |
6da6abae | 38 | #include <linux/namei.h> |
a9218f6b | 39 | #include <linux/miscdevice.h> |
1bcbf313 | 40 | #include <linux/magic.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
90a887c9 | 42 | #include <linux/cleancache.h> |
22c44fe6 | 43 | #include <linux/ratelimit.h> |
4b4e25f2 | 44 | #include "compat.h" |
16cdcec7 | 45 | #include "delayed-inode.h" |
2e635a27 | 46 | #include "ctree.h" |
e20d96d6 | 47 | #include "disk-io.h" |
d5719762 | 48 | #include "transaction.h" |
2c90e5d6 | 49 | #include "btrfs_inode.h" |
c5739bba | 50 | #include "ioctl.h" |
3a686375 | 51 | #include "print-tree.h" |
5103e947 | 52 | #include "xattr.h" |
8a4b83cc | 53 | #include "volumes.h" |
b3c3da71 | 54 | #include "version.h" |
be6e8dc0 | 55 | #include "export.h" |
c8b97818 | 56 | #include "compression.h" |
9c5085c1 | 57 | #include "rcu-string.h" |
2e635a27 | 58 | |
1abe9b8a | 59 | #define CREATE_TRACE_POINTS |
60 | #include <trace/events/btrfs.h> | |
61 | ||
b87221de | 62 | static const struct super_operations btrfs_super_ops; |
830c4adb | 63 | static struct file_system_type btrfs_fs_type; |
75dfe396 | 64 | |
acce952b | 65 | static const char *btrfs_decode_error(struct btrfs_fs_info *fs_info, int errno, |
66 | char nbuf[16]) | |
67 | { | |
68 | char *errstr = NULL; | |
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; | |
acce952b | 83 | default: |
84 | if (nbuf) { | |
85 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
86 | errstr = nbuf; | |
87 | } | |
88 | break; | |
89 | } | |
90 | ||
91 | return errstr; | |
92 | } | |
93 | ||
94 | static void __save_error_info(struct btrfs_fs_info *fs_info) | |
95 | { | |
96 | /* | |
97 | * today we only save the error info into ram. Long term we'll | |
98 | * also send it down to the disk | |
99 | */ | |
100 | fs_info->fs_state = BTRFS_SUPER_FLAG_ERROR; | |
101 | } | |
102 | ||
acce952b | 103 | static void save_error_info(struct btrfs_fs_info *fs_info) |
104 | { | |
105 | __save_error_info(fs_info); | |
106 | } | |
107 | ||
108 | /* btrfs handle error by forcing the filesystem readonly */ | |
109 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) | |
110 | { | |
111 | struct super_block *sb = fs_info->sb; | |
112 | ||
113 | if (sb->s_flags & MS_RDONLY) | |
114 | return; | |
115 | ||
116 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { | |
117 | sb->s_flags |= MS_RDONLY; | |
118 | printk(KERN_INFO "btrfs is forced readonly\n"); | |
49b25e05 JM |
119 | __btrfs_scrub_cancel(fs_info); |
120 | // WARN_ON(1); | |
acce952b | 121 | } |
122 | } | |
123 | ||
533574c6 | 124 | #ifdef CONFIG_PRINTK |
acce952b | 125 | /* |
126 | * __btrfs_std_error decodes expected errors from the caller and | |
127 | * invokes the approciate error response. | |
128 | */ | |
129 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
4da35113 | 130 | unsigned int line, int errno, const char *fmt, ...) |
acce952b | 131 | { |
132 | struct super_block *sb = fs_info->sb; | |
133 | char nbuf[16]; | |
134 | const char *errstr; | |
4da35113 JM |
135 | va_list args; |
136 | va_start(args, fmt); | |
acce952b | 137 | |
138 | /* | |
139 | * Special case: if the error is EROFS, and we're already | |
140 | * under MS_RDONLY, then it is safe here. | |
141 | */ | |
142 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
4da35113 JM |
143 | return; |
144 | ||
145 | errstr = btrfs_decode_error(fs_info, errno, nbuf); | |
146 | if (fmt) { | |
147 | struct va_format vaf = { | |
148 | .fmt = fmt, | |
149 | .va = &args, | |
150 | }; | |
151 | ||
152 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s (%pV)\n", | |
153 | sb->s_id, function, line, errstr, &vaf); | |
154 | } else { | |
155 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n", | |
156 | sb->s_id, function, line, errstr); | |
157 | } | |
acce952b | 158 | |
4da35113 JM |
159 | /* Don't go through full error handling during mount */ |
160 | if (sb->s_flags & MS_BORN) { | |
161 | save_error_info(fs_info); | |
162 | btrfs_handle_error(fs_info); | |
163 | } | |
164 | va_end(args); | |
165 | } | |
acce952b | 166 | |
533574c6 | 167 | static const char * const logtypes[] = { |
4da35113 JM |
168 | "emergency", |
169 | "alert", | |
170 | "critical", | |
171 | "error", | |
172 | "warning", | |
173 | "notice", | |
174 | "info", | |
175 | "debug", | |
176 | }; | |
177 | ||
178 | void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...) | |
179 | { | |
180 | struct super_block *sb = fs_info->sb; | |
181 | char lvl[4]; | |
182 | struct va_format vaf; | |
183 | va_list args; | |
184 | const char *type = logtypes[4]; | |
533574c6 | 185 | int kern_level; |
4da35113 JM |
186 | |
187 | va_start(args, fmt); | |
188 | ||
533574c6 JP |
189 | kern_level = printk_get_level(fmt); |
190 | if (kern_level) { | |
191 | size_t size = printk_skip_level(fmt) - fmt; | |
192 | memcpy(lvl, fmt, size); | |
193 | lvl[size] = '\0'; | |
194 | fmt += size; | |
195 | type = logtypes[kern_level - '0']; | |
4da35113 JM |
196 | } else |
197 | *lvl = '\0'; | |
198 | ||
199 | vaf.fmt = fmt; | |
200 | vaf.va = &args; | |
533574c6 | 201 | |
4da35113 | 202 | printk("%sBTRFS %s (device %s): %pV", lvl, type, sb->s_id, &vaf); |
533574c6 JP |
203 | |
204 | va_end(args); | |
205 | } | |
206 | ||
207 | #else | |
208 | ||
209 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
210 | unsigned int line, int errno, const char *fmt, ...) | |
211 | { | |
212 | struct super_block *sb = fs_info->sb; | |
213 | ||
214 | /* | |
215 | * Special case: if the error is EROFS, and we're already | |
216 | * under MS_RDONLY, then it is safe here. | |
217 | */ | |
218 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
219 | return; | |
220 | ||
221 | /* Don't go through full error handling during mount */ | |
222 | if (sb->s_flags & MS_BORN) { | |
223 | save_error_info(fs_info); | |
224 | btrfs_handle_error(fs_info); | |
225 | } | |
acce952b | 226 | } |
533574c6 | 227 | #endif |
acce952b | 228 | |
49b25e05 JM |
229 | /* |
230 | * We only mark the transaction aborted and then set the file system read-only. | |
231 | * This will prevent new transactions from starting or trying to join this | |
232 | * one. | |
233 | * | |
234 | * This means that error recovery at the call site is limited to freeing | |
235 | * any local memory allocations and passing the error code up without | |
236 | * further cleanup. The transaction should complete as it normally would | |
237 | * in the call path but will return -EIO. | |
238 | * | |
239 | * We'll complete the cleanup in btrfs_end_transaction and | |
240 | * btrfs_commit_transaction. | |
241 | */ | |
242 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, | |
243 | struct btrfs_root *root, const char *function, | |
244 | unsigned int line, int errno) | |
245 | { | |
79787eaa | 246 | WARN_ONCE(1, KERN_DEBUG "btrfs: Transaction aborted"); |
49b25e05 JM |
247 | trans->aborted = errno; |
248 | /* Nothing used. The other threads that have joined this | |
249 | * transaction may be able to continue. */ | |
250 | if (!trans->blocks_used) { | |
69ce977a MX |
251 | char nbuf[16]; |
252 | const char *errstr; | |
253 | ||
254 | errstr = btrfs_decode_error(root->fs_info, errno, nbuf); | |
255 | btrfs_printk(root->fs_info, | |
256 | "%s:%d: Aborting unused transaction(%s).\n", | |
257 | function, line, errstr); | |
acce952b | 258 | return; |
49b25e05 JM |
259 | } |
260 | trans->transaction->aborted = errno; | |
261 | __btrfs_std_error(root->fs_info, function, line, errno, NULL); | |
262 | } | |
8c342930 JM |
263 | /* |
264 | * __btrfs_panic decodes unexpected, fatal errors from the caller, | |
265 | * issues an alert, and either panics or BUGs, depending on mount options. | |
266 | */ | |
267 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, | |
268 | unsigned int line, int errno, const char *fmt, ...) | |
269 | { | |
270 | char nbuf[16]; | |
271 | char *s_id = "<unknown>"; | |
272 | const char *errstr; | |
273 | struct va_format vaf = { .fmt = fmt }; | |
274 | va_list args; | |
acce952b | 275 | |
8c342930 JM |
276 | if (fs_info) |
277 | s_id = fs_info->sb->s_id; | |
acce952b | 278 | |
8c342930 JM |
279 | va_start(args, fmt); |
280 | vaf.va = &args; | |
281 | ||
282 | errstr = btrfs_decode_error(fs_info, errno, nbuf); | |
283 | if (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR) | |
284 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (%s)\n", | |
285 | s_id, function, line, &vaf, errstr); | |
286 | ||
287 | printk(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (%s)\n", | |
288 | s_id, function, line, &vaf, errstr); | |
289 | va_end(args); | |
290 | /* Caller calls BUG() */ | |
acce952b | 291 | } |
292 | ||
d397712b | 293 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 294 | { |
815745cf | 295 | (void)close_ctree(btrfs_sb(sb)->tree_root); |
aea52e19 AV |
296 | /* FIXME: need to fix VFS to return error? */ |
297 | /* AV: return it _where_? ->put_super() can be triggered by any number | |
298 | * of async events, up to and including delivery of SIGKILL to the | |
299 | * last process that kept it busy. Or segfault in the aforementioned | |
300 | * process... Whom would you report that to? | |
301 | */ | |
75dfe396 CM |
302 | } |
303 | ||
95e05289 | 304 | enum { |
73f73415 | 305 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
306 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
307 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
261507a0 LZ |
308 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
309 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
91435650 | 310 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
9555c6c1 ID |
311 | Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, |
312 | Opt_no_space_cache, Opt_recovery, Opt_skip_balance, | |
21adbd5c | 313 | Opt_check_integrity, Opt_check_integrity_including_extent_data, |
8c342930 | 314 | Opt_check_integrity_print_mask, Opt_fatal_errors, |
9555c6c1 | 315 | Opt_err, |
95e05289 CM |
316 | }; |
317 | ||
318 | static match_table_t tokens = { | |
dfe25020 | 319 | {Opt_degraded, "degraded"}, |
95e05289 | 320 | {Opt_subvol, "subvol=%s"}, |
73f73415 | 321 | {Opt_subvolid, "subvolid=%d"}, |
43e570b0 | 322 | {Opt_device, "device=%s"}, |
b6cda9bc | 323 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 324 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 325 | {Opt_nobarrier, "nobarrier"}, |
6f568d35 | 326 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 327 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 328 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 329 | {Opt_compress, "compress"}, |
261507a0 | 330 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 331 | {Opt_compress_force, "compress-force"}, |
261507a0 | 332 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 333 | {Opt_ssd, "ssd"}, |
451d7585 | 334 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 335 | {Opt_nossd, "nossd"}, |
33268eaf | 336 | {Opt_noacl, "noacl"}, |
3a5e1404 | 337 | {Opt_notreelog, "notreelog"}, |
dccae999 | 338 | {Opt_flushoncommit, "flushoncommit"}, |
97e728d4 | 339 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 340 | {Opt_discard, "discard"}, |
0af3d00b | 341 | {Opt_space_cache, "space_cache"}, |
88c2ba3b | 342 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 343 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 344 | {Opt_enospc_debug, "enospc_debug"}, |
e15d0542 | 345 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 346 | {Opt_defrag, "autodefrag"}, |
4b9465cb | 347 | {Opt_inode_cache, "inode_cache"}, |
8965593e | 348 | {Opt_no_space_cache, "nospace_cache"}, |
af31f5e5 | 349 | {Opt_recovery, "recovery"}, |
9555c6c1 | 350 | {Opt_skip_balance, "skip_balance"}, |
21adbd5c SB |
351 | {Opt_check_integrity, "check_int"}, |
352 | {Opt_check_integrity_including_extent_data, "check_int_data"}, | |
353 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, | |
8c342930 | 354 | {Opt_fatal_errors, "fatal_errors=%s"}, |
33268eaf | 355 | {Opt_err, NULL}, |
95e05289 CM |
356 | }; |
357 | ||
edf24abe CH |
358 | /* |
359 | * Regular mount options parser. Everything that is needed only when | |
360 | * reading in a new superblock is parsed here. | |
49b25e05 | 361 | * XXX JDM: This needs to be cleaned up for remount. |
edf24abe CH |
362 | */ |
363 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 364 | { |
edf24abe | 365 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 366 | substring_t args[MAX_OPT_ARGS]; |
73bc1876 JB |
367 | char *p, *num, *orig = NULL; |
368 | u64 cache_gen; | |
4543df7e | 369 | int intarg; |
a7a3f7ca | 370 | int ret = 0; |
261507a0 LZ |
371 | char *compress_type; |
372 | bool compress_force = false; | |
b6cda9bc | 373 | |
6c41761f | 374 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
73bc1876 JB |
375 | if (cache_gen) |
376 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); | |
377 | ||
95e05289 | 378 | if (!options) |
73bc1876 | 379 | goto out; |
95e05289 | 380 | |
be20aa9d CM |
381 | /* |
382 | * strsep changes the string, duplicate it because parse_options | |
383 | * gets called twice | |
384 | */ | |
385 | options = kstrdup(options, GFP_NOFS); | |
386 | if (!options) | |
387 | return -ENOMEM; | |
388 | ||
da495ecc | 389 | orig = options; |
be20aa9d | 390 | |
edf24abe | 391 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
392 | int token; |
393 | if (!*p) | |
394 | continue; | |
395 | ||
396 | token = match_token(p, tokens, args); | |
397 | switch (token) { | |
dfe25020 | 398 | case Opt_degraded: |
edf24abe CH |
399 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
400 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 401 | break; |
95e05289 | 402 | case Opt_subvol: |
73f73415 | 403 | case Opt_subvolid: |
e15d0542 | 404 | case Opt_subvolrootid: |
43e570b0 | 405 | case Opt_device: |
edf24abe | 406 | /* |
43e570b0 | 407 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
408 | * and can be happily ignored here. |
409 | */ | |
b6cda9bc CM |
410 | break; |
411 | case Opt_nodatasum: | |
067c28ad | 412 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
edf24abe | 413 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
414 | break; |
415 | case Opt_nodatacow: | |
edf24abe CH |
416 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
417 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
418 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 419 | break; |
a555f810 | 420 | case Opt_compress_force: |
261507a0 LZ |
421 | case Opt_compress_force_type: |
422 | compress_force = true; | |
423 | case Opt_compress: | |
424 | case Opt_compress_type: | |
425 | if (token == Opt_compress || | |
426 | token == Opt_compress_force || | |
427 | strcmp(args[0].from, "zlib") == 0) { | |
428 | compress_type = "zlib"; | |
429 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
063849ea | 430 | btrfs_set_opt(info->mount_opt, COMPRESS); |
a6fa6fae LZ |
431 | } else if (strcmp(args[0].from, "lzo") == 0) { |
432 | compress_type = "lzo"; | |
433 | info->compress_type = BTRFS_COMPRESS_LZO; | |
063849ea | 434 | btrfs_set_opt(info->mount_opt, COMPRESS); |
2b0ce2c2 | 435 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
063849ea AH |
436 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
437 | compress_type = "no"; | |
438 | info->compress_type = BTRFS_COMPRESS_NONE; | |
439 | btrfs_clear_opt(info->mount_opt, COMPRESS); | |
440 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); | |
441 | compress_force = false; | |
261507a0 LZ |
442 | } else { |
443 | ret = -EINVAL; | |
444 | goto out; | |
445 | } | |
446 | ||
261507a0 LZ |
447 | if (compress_force) { |
448 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
449 | pr_info("btrfs: force %s compression\n", | |
450 | compress_type); | |
451 | } else | |
452 | pr_info("btrfs: use %s compression\n", | |
453 | compress_type); | |
a555f810 | 454 | break; |
e18e4809 | 455 | case Opt_ssd: |
edf24abe CH |
456 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
457 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 458 | break; |
451d7585 CM |
459 | case Opt_ssd_spread: |
460 | printk(KERN_INFO "btrfs: use spread ssd " | |
461 | "allocation scheme\n"); | |
462 | btrfs_set_opt(info->mount_opt, SSD); | |
463 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
464 | break; | |
3b30c22f | 465 | case Opt_nossd: |
451d7585 CM |
466 | printk(KERN_INFO "btrfs: not using ssd allocation " |
467 | "scheme\n"); | |
c289811c | 468 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 469 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 470 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 471 | break; |
21ad10cf | 472 | case Opt_nobarrier: |
edf24abe CH |
473 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
474 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 475 | break; |
4543df7e CM |
476 | case Opt_thread_pool: |
477 | intarg = 0; | |
478 | match_int(&args[0], &intarg); | |
0d2450ab | 479 | if (intarg) |
4543df7e | 480 | info->thread_pool_size = intarg; |
4543df7e | 481 | break; |
6f568d35 | 482 | case Opt_max_inline: |
edf24abe CH |
483 | num = match_strdup(&args[0]); |
484 | if (num) { | |
91748467 | 485 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
486 | kfree(num); |
487 | ||
15ada040 CM |
488 | if (info->max_inline) { |
489 | info->max_inline = max_t(u64, | |
490 | info->max_inline, | |
491 | root->sectorsize); | |
492 | } | |
edf24abe | 493 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
21380931 | 494 | (unsigned long long)info->max_inline); |
6f568d35 CM |
495 | } |
496 | break; | |
8f662a76 | 497 | case Opt_alloc_start: |
edf24abe CH |
498 | num = match_strdup(&args[0]); |
499 | if (num) { | |
91748467 | 500 | info->alloc_start = memparse(num, NULL); |
edf24abe CH |
501 | kfree(num); |
502 | printk(KERN_INFO | |
503 | "btrfs: allocations start at %llu\n", | |
21380931 | 504 | (unsigned long long)info->alloc_start); |
8f662a76 CM |
505 | } |
506 | break; | |
33268eaf JB |
507 | case Opt_noacl: |
508 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
509 | break; | |
3a5e1404 SW |
510 | case Opt_notreelog: |
511 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
512 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
513 | break; | |
dccae999 SW |
514 | case Opt_flushoncommit: |
515 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
516 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
517 | break; | |
97e728d4 JB |
518 | case Opt_ratio: |
519 | intarg = 0; | |
520 | match_int(&args[0], &intarg); | |
521 | if (intarg) { | |
522 | info->metadata_ratio = intarg; | |
523 | printk(KERN_INFO "btrfs: metadata ratio %d\n", | |
524 | info->metadata_ratio); | |
525 | } | |
526 | break; | |
e244a0ae CH |
527 | case Opt_discard: |
528 | btrfs_set_opt(info->mount_opt, DISCARD); | |
529 | break; | |
0af3d00b | 530 | case Opt_space_cache: |
0af3d00b | 531 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
0de90876 | 532 | break; |
73bc1876 JB |
533 | case Opt_no_space_cache: |
534 | printk(KERN_INFO "btrfs: disabling disk space caching\n"); | |
535 | btrfs_clear_opt(info->mount_opt, SPACE_CACHE); | |
536 | break; | |
4b9465cb CM |
537 | case Opt_inode_cache: |
538 | printk(KERN_INFO "btrfs: enabling inode map caching\n"); | |
539 | btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); | |
540 | break; | |
88c2ba3b JB |
541 | case Opt_clear_cache: |
542 | printk(KERN_INFO "btrfs: force clearing of disk cache\n"); | |
543 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); | |
0af3d00b | 544 | break; |
4260f7c7 SW |
545 | case Opt_user_subvol_rm_allowed: |
546 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
547 | break; | |
91435650 CM |
548 | case Opt_enospc_debug: |
549 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
550 | break; | |
4cb5300b CM |
551 | case Opt_defrag: |
552 | printk(KERN_INFO "btrfs: enabling auto defrag"); | |
553 | btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); | |
554 | break; | |
af31f5e5 CM |
555 | case Opt_recovery: |
556 | printk(KERN_INFO "btrfs: enabling auto recovery"); | |
557 | btrfs_set_opt(info->mount_opt, RECOVERY); | |
558 | break; | |
9555c6c1 ID |
559 | case Opt_skip_balance: |
560 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); | |
561 | break; | |
21adbd5c SB |
562 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
563 | case Opt_check_integrity_including_extent_data: | |
564 | printk(KERN_INFO "btrfs: enabling check integrity" | |
565 | " including extent data\n"); | |
566 | btrfs_set_opt(info->mount_opt, | |
567 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); | |
568 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
569 | break; | |
570 | case Opt_check_integrity: | |
571 | printk(KERN_INFO "btrfs: enabling check integrity\n"); | |
572 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); | |
573 | break; | |
574 | case Opt_check_integrity_print_mask: | |
575 | intarg = 0; | |
576 | match_int(&args[0], &intarg); | |
577 | if (intarg) { | |
578 | info->check_integrity_print_mask = intarg; | |
579 | printk(KERN_INFO "btrfs:" | |
580 | " check_integrity_print_mask 0x%x\n", | |
581 | info->check_integrity_print_mask); | |
582 | } | |
583 | break; | |
584 | #else | |
585 | case Opt_check_integrity_including_extent_data: | |
586 | case Opt_check_integrity: | |
587 | case Opt_check_integrity_print_mask: | |
588 | printk(KERN_ERR "btrfs: support for check_integrity*" | |
589 | " not compiled in!\n"); | |
590 | ret = -EINVAL; | |
591 | goto out; | |
592 | #endif | |
8c342930 JM |
593 | case Opt_fatal_errors: |
594 | if (strcmp(args[0].from, "panic") == 0) | |
595 | btrfs_set_opt(info->mount_opt, | |
596 | PANIC_ON_FATAL_ERROR); | |
597 | else if (strcmp(args[0].from, "bug") == 0) | |
598 | btrfs_clear_opt(info->mount_opt, | |
599 | PANIC_ON_FATAL_ERROR); | |
600 | else { | |
601 | ret = -EINVAL; | |
602 | goto out; | |
603 | } | |
604 | break; | |
a7a3f7ca SW |
605 | case Opt_err: |
606 | printk(KERN_INFO "btrfs: unrecognized mount option " | |
607 | "'%s'\n", p); | |
608 | ret = -EINVAL; | |
609 | goto out; | |
95e05289 | 610 | default: |
be20aa9d | 611 | break; |
95e05289 CM |
612 | } |
613 | } | |
a7a3f7ca | 614 | out: |
73bc1876 JB |
615 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
616 | printk(KERN_INFO "btrfs: disk space caching is enabled\n"); | |
da495ecc | 617 | kfree(orig); |
a7a3f7ca | 618 | return ret; |
edf24abe CH |
619 | } |
620 | ||
621 | /* | |
622 | * Parse mount options that are required early in the mount process. | |
623 | * | |
624 | * All other options will be parsed on much later in the mount process and | |
625 | * only when we need to allocate a new super block. | |
626 | */ | |
97288f2c | 627 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 628 | void *holder, char **subvol_name, u64 *subvol_objectid, |
e15d0542 | 629 | u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
630 | { |
631 | substring_t args[MAX_OPT_ARGS]; | |
83c8c9bd | 632 | char *device_name, *opts, *orig, *p; |
edf24abe | 633 | int error = 0; |
73f73415 | 634 | int intarg; |
edf24abe CH |
635 | |
636 | if (!options) | |
830c4adb | 637 | return 0; |
edf24abe CH |
638 | |
639 | /* | |
640 | * strsep changes the string, duplicate it because parse_options | |
641 | * gets called twice | |
642 | */ | |
643 | opts = kstrdup(options, GFP_KERNEL); | |
644 | if (!opts) | |
645 | return -ENOMEM; | |
3f3d0bc0 | 646 | orig = opts; |
edf24abe CH |
647 | |
648 | while ((p = strsep(&opts, ",")) != NULL) { | |
649 | int token; | |
650 | if (!*p) | |
651 | continue; | |
652 | ||
653 | token = match_token(p, tokens, args); | |
654 | switch (token) { | |
655 | case Opt_subvol: | |
a90e8b6f | 656 | kfree(*subvol_name); |
edf24abe CH |
657 | *subvol_name = match_strdup(&args[0]); |
658 | break; | |
73f73415 JB |
659 | case Opt_subvolid: |
660 | intarg = 0; | |
4849f01d JB |
661 | error = match_int(&args[0], &intarg); |
662 | if (!error) { | |
663 | /* we want the original fs_tree */ | |
664 | if (!intarg) | |
665 | *subvol_objectid = | |
666 | BTRFS_FS_TREE_OBJECTID; | |
667 | else | |
668 | *subvol_objectid = intarg; | |
669 | } | |
73f73415 | 670 | break; |
e15d0542 XZ |
671 | case Opt_subvolrootid: |
672 | intarg = 0; | |
673 | error = match_int(&args[0], &intarg); | |
674 | if (!error) { | |
675 | /* we want the original fs_tree */ | |
676 | if (!intarg) | |
677 | *subvol_rootid = | |
678 | BTRFS_FS_TREE_OBJECTID; | |
679 | else | |
680 | *subvol_rootid = intarg; | |
681 | } | |
682 | break; | |
43e570b0 | 683 | case Opt_device: |
83c8c9bd JL |
684 | device_name = match_strdup(&args[0]); |
685 | if (!device_name) { | |
686 | error = -ENOMEM; | |
687 | goto out; | |
688 | } | |
689 | error = btrfs_scan_one_device(device_name, | |
43e570b0 | 690 | flags, holder, fs_devices); |
83c8c9bd | 691 | kfree(device_name); |
43e570b0 | 692 | if (error) |
830c4adb | 693 | goto out; |
43e570b0 | 694 | break; |
edf24abe CH |
695 | default: |
696 | break; | |
697 | } | |
698 | } | |
699 | ||
830c4adb | 700 | out: |
3f3d0bc0 | 701 | kfree(orig); |
edf24abe | 702 | return error; |
95e05289 CM |
703 | } |
704 | ||
73f73415 JB |
705 | static struct dentry *get_default_root(struct super_block *sb, |
706 | u64 subvol_objectid) | |
707 | { | |
815745cf AV |
708 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
709 | struct btrfs_root *root = fs_info->tree_root; | |
73f73415 JB |
710 | struct btrfs_root *new_root; |
711 | struct btrfs_dir_item *di; | |
712 | struct btrfs_path *path; | |
713 | struct btrfs_key location; | |
714 | struct inode *inode; | |
73f73415 JB |
715 | u64 dir_id; |
716 | int new = 0; | |
717 | ||
718 | /* | |
719 | * We have a specific subvol we want to mount, just setup location and | |
720 | * go look up the root. | |
721 | */ | |
722 | if (subvol_objectid) { | |
723 | location.objectid = subvol_objectid; | |
724 | location.type = BTRFS_ROOT_ITEM_KEY; | |
725 | location.offset = (u64)-1; | |
726 | goto find_root; | |
727 | } | |
728 | ||
729 | path = btrfs_alloc_path(); | |
730 | if (!path) | |
731 | return ERR_PTR(-ENOMEM); | |
732 | path->leave_spinning = 1; | |
733 | ||
734 | /* | |
735 | * Find the "default" dir item which points to the root item that we | |
736 | * will mount by default if we haven't been given a specific subvolume | |
737 | * to mount. | |
738 | */ | |
815745cf | 739 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
73f73415 | 740 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
b0839166 JL |
741 | if (IS_ERR(di)) { |
742 | btrfs_free_path(path); | |
fb4f6f91 | 743 | return ERR_CAST(di); |
b0839166 | 744 | } |
73f73415 JB |
745 | if (!di) { |
746 | /* | |
747 | * Ok the default dir item isn't there. This is weird since | |
748 | * it's always been there, but don't freak out, just try and | |
749 | * mount to root most subvolume. | |
750 | */ | |
751 | btrfs_free_path(path); | |
752 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
815745cf | 753 | new_root = fs_info->fs_root; |
73f73415 JB |
754 | goto setup_root; |
755 | } | |
756 | ||
757 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
758 | btrfs_free_path(path); | |
759 | ||
760 | find_root: | |
815745cf | 761 | new_root = btrfs_read_fs_root_no_name(fs_info, &location); |
73f73415 | 762 | if (IS_ERR(new_root)) |
d0b678cb | 763 | return ERR_CAST(new_root); |
73f73415 JB |
764 | |
765 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
766 | return ERR_PTR(-ENOENT); | |
767 | ||
768 | dir_id = btrfs_root_dirid(&new_root->root_item); | |
769 | setup_root: | |
770 | location.objectid = dir_id; | |
771 | location.type = BTRFS_INODE_ITEM_KEY; | |
772 | location.offset = 0; | |
773 | ||
774 | inode = btrfs_iget(sb, &location, new_root, &new); | |
4cbd1149 DC |
775 | if (IS_ERR(inode)) |
776 | return ERR_CAST(inode); | |
73f73415 JB |
777 | |
778 | /* | |
779 | * If we're just mounting the root most subvol put the inode and return | |
780 | * a reference to the dentry. We will have already gotten a reference | |
781 | * to the inode in btrfs_fill_super so we're good to go. | |
782 | */ | |
783 | if (!new && sb->s_root->d_inode == inode) { | |
784 | iput(inode); | |
785 | return dget(sb->s_root); | |
786 | } | |
787 | ||
ba5b8958 | 788 | return d_obtain_alias(inode); |
73f73415 JB |
789 | } |
790 | ||
d397712b | 791 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 792 | struct btrfs_fs_devices *fs_devices, |
d397712b | 793 | void *data, int silent) |
75dfe396 | 794 | { |
d397712b | 795 | struct inode *inode; |
815745cf | 796 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
5d4f98a2 | 797 | struct btrfs_key key; |
39279cc3 | 798 | int err; |
a429e513 | 799 | |
39279cc3 CM |
800 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
801 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
802 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 803 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 804 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 805 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 806 | sb->s_time_gran = 1; |
0eda294d | 807 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 808 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 809 | #endif |
0c4d2d95 | 810 | sb->s_flags |= MS_I_VERSION; |
ad2b2c80 AV |
811 | err = open_ctree(sb, fs_devices, (char *)data); |
812 | if (err) { | |
39279cc3 | 813 | printk("btrfs: open_ctree failed\n"); |
ad2b2c80 | 814 | return err; |
a429e513 CM |
815 | } |
816 | ||
5d4f98a2 YZ |
817 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
818 | key.type = BTRFS_INODE_ITEM_KEY; | |
819 | key.offset = 0; | |
98c7089c | 820 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
5d4f98a2 YZ |
821 | if (IS_ERR(inode)) { |
822 | err = PTR_ERR(inode); | |
39279cc3 | 823 | goto fail_close; |
f254e52c | 824 | } |
f254e52c | 825 | |
48fde701 AV |
826 | sb->s_root = d_make_root(inode); |
827 | if (!sb->s_root) { | |
39279cc3 CM |
828 | err = -ENOMEM; |
829 | goto fail_close; | |
f254e52c | 830 | } |
58176a96 | 831 | |
6885f308 | 832 | save_mount_options(sb, data); |
90a887c9 | 833 | cleancache_init_fs(sb); |
59553edf | 834 | sb->s_flags |= MS_ACTIVE; |
2619ba1f | 835 | return 0; |
39279cc3 CM |
836 | |
837 | fail_close: | |
815745cf | 838 | close_ctree(fs_info->tree_root); |
39279cc3 | 839 | return err; |
2619ba1f CM |
840 | } |
841 | ||
6bf13c0c | 842 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
843 | { |
844 | struct btrfs_trans_handle *trans; | |
815745cf AV |
845 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
846 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 847 | |
1abe9b8a | 848 | trace_btrfs_sync_fs(wait); |
849 | ||
39279cc3 | 850 | if (!wait) { |
815745cf | 851 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
852 | return 0; |
853 | } | |
771ed689 | 854 | |
6bbe3a9c | 855 | btrfs_wait_ordered_extents(root, 0); |
771ed689 | 856 | |
354aa0fb | 857 | trans = btrfs_attach_transaction(root); |
60376ce4 | 858 | if (IS_ERR(trans)) { |
354aa0fb MX |
859 | /* no transaction, don't bother */ |
860 | if (PTR_ERR(trans) == -ENOENT) | |
60376ce4 | 861 | return 0; |
98d5dc13 | 862 | return PTR_ERR(trans); |
60376ce4 | 863 | } |
bd7de2c9 | 864 | return btrfs_commit_transaction(trans, root); |
2c90e5d6 CM |
865 | } |
866 | ||
34c80b1d | 867 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 868 | { |
815745cf AV |
869 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
870 | struct btrfs_root *root = info->tree_root; | |
200da64e | 871 | char *compress_type; |
a9572a15 EP |
872 | |
873 | if (btrfs_test_opt(root, DEGRADED)) | |
874 | seq_puts(seq, ",degraded"); | |
875 | if (btrfs_test_opt(root, NODATASUM)) | |
876 | seq_puts(seq, ",nodatasum"); | |
877 | if (btrfs_test_opt(root, NODATACOW)) | |
878 | seq_puts(seq, ",nodatacow"); | |
879 | if (btrfs_test_opt(root, NOBARRIER)) | |
880 | seq_puts(seq, ",nobarrier"); | |
a9572a15 | 881 | if (info->max_inline != 8192 * 1024) |
21380931 JB |
882 | seq_printf(seq, ",max_inline=%llu", |
883 | (unsigned long long)info->max_inline); | |
a9572a15 | 884 | if (info->alloc_start != 0) |
21380931 JB |
885 | seq_printf(seq, ",alloc_start=%llu", |
886 | (unsigned long long)info->alloc_start); | |
a9572a15 EP |
887 | if (info->thread_pool_size != min_t(unsigned long, |
888 | num_online_cpus() + 2, 8)) | |
889 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
200da64e TI |
890 | if (btrfs_test_opt(root, COMPRESS)) { |
891 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) | |
892 | compress_type = "zlib"; | |
893 | else | |
894 | compress_type = "lzo"; | |
895 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
896 | seq_printf(seq, ",compress-force=%s", compress_type); | |
897 | else | |
898 | seq_printf(seq, ",compress=%s", compress_type); | |
899 | } | |
c289811c CM |
900 | if (btrfs_test_opt(root, NOSSD)) |
901 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
902 | if (btrfs_test_opt(root, SSD_SPREAD)) |
903 | seq_puts(seq, ",ssd_spread"); | |
904 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 905 | seq_puts(seq, ",ssd"); |
3a5e1404 | 906 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 907 | seq_puts(seq, ",notreelog"); |
dccae999 | 908 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 909 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
910 | if (btrfs_test_opt(root, DISCARD)) |
911 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
912 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
913 | seq_puts(seq, ",noacl"); | |
200da64e TI |
914 | if (btrfs_test_opt(root, SPACE_CACHE)) |
915 | seq_puts(seq, ",space_cache"); | |
73bc1876 | 916 | else |
8965593e | 917 | seq_puts(seq, ",nospace_cache"); |
200da64e TI |
918 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
919 | seq_puts(seq, ",clear_cache"); | |
920 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
921 | seq_puts(seq, ",user_subvol_rm_allowed"); | |
0942caa3 DS |
922 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
923 | seq_puts(seq, ",enospc_debug"); | |
924 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
925 | seq_puts(seq, ",autodefrag"); | |
926 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) | |
927 | seq_puts(seq, ",inode_cache"); | |
9555c6c1 ID |
928 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
929 | seq_puts(seq, ",skip_balance"); | |
8c342930 JM |
930 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
931 | seq_puts(seq, ",fatal_errors=panic"); | |
a9572a15 EP |
932 | return 0; |
933 | } | |
934 | ||
a061fc8d | 935 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 936 | { |
815745cf AV |
937 | struct btrfs_fs_info *p = data; |
938 | struct btrfs_fs_info *fs_info = btrfs_sb(s); | |
4b82d6e4 | 939 | |
815745cf | 940 | return fs_info->fs_devices == p->fs_devices; |
4b82d6e4 Y |
941 | } |
942 | ||
450ba0ea JB |
943 | static int btrfs_set_super(struct super_block *s, void *data) |
944 | { | |
6de1d09d AV |
945 | int err = set_anon_super(s, data); |
946 | if (!err) | |
947 | s->s_fs_info = data; | |
948 | return err; | |
4b82d6e4 Y |
949 | } |
950 | ||
f9d9ef62 DS |
951 | /* |
952 | * subvolumes are identified by ino 256 | |
953 | */ | |
954 | static inline int is_subvolume_inode(struct inode *inode) | |
955 | { | |
956 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
957 | return 1; | |
958 | return 0; | |
959 | } | |
960 | ||
830c4adb JB |
961 | /* |
962 | * This will strip out the subvol=%s argument for an argument string and add | |
963 | * subvolid=0 to make sure we get the actual tree root for path walking to the | |
964 | * subvol we want. | |
965 | */ | |
966 | static char *setup_root_args(char *args) | |
967 | { | |
f60d16a8 JM |
968 | unsigned len = strlen(args) + 2 + 1; |
969 | char *src, *dst, *buf; | |
830c4adb JB |
970 | |
971 | /* | |
f60d16a8 JM |
972 | * We need the same args as before, but with this substitution: |
973 | * s!subvol=[^,]+!subvolid=0! | |
830c4adb | 974 | * |
f60d16a8 JM |
975 | * Since the replacement string is up to 2 bytes longer than the |
976 | * original, allocate strlen(args) + 2 + 1 bytes. | |
830c4adb | 977 | */ |
830c4adb | 978 | |
f60d16a8 | 979 | src = strstr(args, "subvol="); |
830c4adb | 980 | /* This shouldn't happen, but just in case.. */ |
f60d16a8 JM |
981 | if (!src) |
982 | return NULL; | |
983 | ||
984 | buf = dst = kmalloc(len, GFP_NOFS); | |
985 | if (!buf) | |
830c4adb | 986 | return NULL; |
830c4adb JB |
987 | |
988 | /* | |
f60d16a8 JM |
989 | * If the subvol= arg is not at the start of the string, |
990 | * copy whatever precedes it into buf. | |
830c4adb | 991 | */ |
f60d16a8 JM |
992 | if (src != args) { |
993 | *src++ = '\0'; | |
994 | strcpy(buf, args); | |
995 | dst += strlen(args); | |
830c4adb JB |
996 | } |
997 | ||
f60d16a8 JM |
998 | strcpy(dst, "subvolid=0"); |
999 | dst += strlen("subvolid=0"); | |
830c4adb JB |
1000 | |
1001 | /* | |
f60d16a8 JM |
1002 | * If there is a "," after the original subvol=... string, |
1003 | * copy that suffix into our buffer. Otherwise, we're done. | |
830c4adb | 1004 | */ |
f60d16a8 JM |
1005 | src = strchr(src, ','); |
1006 | if (src) | |
1007 | strcpy(dst, src); | |
830c4adb | 1008 | |
f60d16a8 | 1009 | return buf; |
830c4adb JB |
1010 | } |
1011 | ||
1012 | static struct dentry *mount_subvol(const char *subvol_name, int flags, | |
1013 | const char *device_name, char *data) | |
1014 | { | |
830c4adb JB |
1015 | struct dentry *root; |
1016 | struct vfsmount *mnt; | |
830c4adb | 1017 | char *newargs; |
830c4adb JB |
1018 | |
1019 | newargs = setup_root_args(data); | |
1020 | if (!newargs) | |
1021 | return ERR_PTR(-ENOMEM); | |
1022 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, | |
1023 | newargs); | |
1024 | kfree(newargs); | |
1025 | if (IS_ERR(mnt)) | |
1026 | return ERR_CAST(mnt); | |
1027 | ||
ea441d11 | 1028 | root = mount_subtree(mnt, subvol_name); |
830c4adb | 1029 | |
ea441d11 AV |
1030 | if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { |
1031 | struct super_block *s = root->d_sb; | |
1032 | dput(root); | |
1033 | root = ERR_PTR(-EINVAL); | |
1034 | deactivate_locked_super(s); | |
f9d9ef62 DS |
1035 | printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n", |
1036 | subvol_name); | |
f9d9ef62 DS |
1037 | } |
1038 | ||
830c4adb JB |
1039 | return root; |
1040 | } | |
450ba0ea | 1041 | |
edf24abe CH |
1042 | /* |
1043 | * Find a superblock for the given device / mount point. | |
1044 | * | |
1045 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
1046 | * for multiple device setup. Make sure to keep it in sync. | |
1047 | */ | |
061dbc6b | 1048 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 1049 | const char *device_name, void *data) |
4b82d6e4 Y |
1050 | { |
1051 | struct block_device *bdev = NULL; | |
1052 | struct super_block *s; | |
1053 | struct dentry *root; | |
8a4b83cc | 1054 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea | 1055 | struct btrfs_fs_info *fs_info = NULL; |
97288f2c | 1056 | fmode_t mode = FMODE_READ; |
73f73415 JB |
1057 | char *subvol_name = NULL; |
1058 | u64 subvol_objectid = 0; | |
e15d0542 | 1059 | u64 subvol_rootid = 0; |
4b82d6e4 Y |
1060 | int error = 0; |
1061 | ||
97288f2c CH |
1062 | if (!(flags & MS_RDONLY)) |
1063 | mode |= FMODE_WRITE; | |
1064 | ||
1065 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 1066 | &subvol_name, &subvol_objectid, |
e15d0542 | 1067 | &subvol_rootid, &fs_devices); |
f23c8af8 ID |
1068 | if (error) { |
1069 | kfree(subvol_name); | |
061dbc6b | 1070 | return ERR_PTR(error); |
f23c8af8 | 1071 | } |
edf24abe | 1072 | |
830c4adb JB |
1073 | if (subvol_name) { |
1074 | root = mount_subvol(subvol_name, flags, device_name, data); | |
1075 | kfree(subvol_name); | |
1076 | return root; | |
1077 | } | |
1078 | ||
306e16ce | 1079 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 1080 | if (error) |
830c4adb | 1081 | return ERR_PTR(error); |
4b82d6e4 | 1082 | |
450ba0ea JB |
1083 | /* |
1084 | * Setup a dummy root and fs_info for test/set super. This is because | |
1085 | * we don't actually fill this stuff out until open_ctree, but we need | |
1086 | * it for searching for existing supers, so this lets us do that and | |
1087 | * then open_ctree will properly initialize everything later. | |
1088 | */ | |
1089 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
04d21a24 ID |
1090 | if (!fs_info) |
1091 | return ERR_PTR(-ENOMEM); | |
1092 | ||
450ba0ea | 1093 | fs_info->fs_devices = fs_devices; |
450ba0ea | 1094 | |
6c41761f DS |
1095 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
1096 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); | |
1097 | if (!fs_info->super_copy || !fs_info->super_for_commit) { | |
1098 | error = -ENOMEM; | |
04d21a24 ID |
1099 | goto error_fs_info; |
1100 | } | |
1101 | ||
1102 | error = btrfs_open_devices(fs_devices, mode, fs_type); | |
1103 | if (error) | |
1104 | goto error_fs_info; | |
1105 | ||
1106 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { | |
1107 | error = -EACCES; | |
6c41761f DS |
1108 | goto error_close_devices; |
1109 | } | |
1110 | ||
dfe25020 | 1111 | bdev = fs_devices->latest_bdev; |
9249e17f DH |
1112 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
1113 | fs_info); | |
830c4adb JB |
1114 | if (IS_ERR(s)) { |
1115 | error = PTR_ERR(s); | |
1116 | goto error_close_devices; | |
1117 | } | |
4b82d6e4 Y |
1118 | |
1119 | if (s->s_root) { | |
2b82032c | 1120 | btrfs_close_devices(fs_devices); |
6c41761f | 1121 | free_fs_info(fs_info); |
59553edf AV |
1122 | if ((flags ^ s->s_flags) & MS_RDONLY) |
1123 | error = -EBUSY; | |
4b82d6e4 Y |
1124 | } else { |
1125 | char b[BDEVNAME_SIZE]; | |
1126 | ||
4b82d6e4 | 1127 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
815745cf | 1128 | btrfs_sb(s)->bdev_holder = fs_type; |
8a4b83cc CM |
1129 | error = btrfs_fill_super(s, fs_devices, data, |
1130 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 Y |
1131 | } |
1132 | ||
59553edf AV |
1133 | root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); |
1134 | if (IS_ERR(root)) | |
830c4adb | 1135 | deactivate_locked_super(s); |
4b82d6e4 | 1136 | |
061dbc6b | 1137 | return root; |
4b82d6e4 | 1138 | |
c146afad | 1139 | error_close_devices: |
8a4b83cc | 1140 | btrfs_close_devices(fs_devices); |
04d21a24 | 1141 | error_fs_info: |
6c41761f | 1142 | free_fs_info(fs_info); |
061dbc6b | 1143 | return ERR_PTR(error); |
4b82d6e4 | 1144 | } |
2e635a27 | 1145 | |
0d2450ab ST |
1146 | static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit) |
1147 | { | |
1148 | spin_lock_irq(&workers->lock); | |
1149 | workers->max_workers = new_limit; | |
1150 | spin_unlock_irq(&workers->lock); | |
1151 | } | |
1152 | ||
1153 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, | |
1154 | int new_pool_size, int old_pool_size) | |
1155 | { | |
1156 | if (new_pool_size == old_pool_size) | |
1157 | return; | |
1158 | ||
1159 | fs_info->thread_pool_size = new_pool_size; | |
1160 | ||
1161 | printk(KERN_INFO "btrfs: resize thread pool %d -> %d\n", | |
1162 | old_pool_size, new_pool_size); | |
1163 | ||
1164 | btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size); | |
1165 | btrfs_set_max_workers(&fs_info->workers, new_pool_size); | |
1166 | btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size); | |
1167 | btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size); | |
1168 | btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size); | |
1169 | btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size); | |
1170 | btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size); | |
1171 | btrfs_set_max_workers(&fs_info->endio_meta_workers, new_pool_size); | |
1172 | btrfs_set_max_workers(&fs_info->endio_meta_write_workers, new_pool_size); | |
1173 | btrfs_set_max_workers(&fs_info->endio_write_workers, new_pool_size); | |
1174 | btrfs_set_max_workers(&fs_info->endio_freespace_worker, new_pool_size); | |
1175 | btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size); | |
1176 | btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size); | |
1177 | btrfs_set_max_workers(&fs_info->scrub_workers, new_pool_size); | |
1178 | } | |
1179 | ||
c146afad YZ |
1180 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
1181 | { | |
815745cf AV |
1182 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
1183 | struct btrfs_root *root = fs_info->tree_root; | |
49b25e05 JM |
1184 | unsigned old_flags = sb->s_flags; |
1185 | unsigned long old_opts = fs_info->mount_opt; | |
1186 | unsigned long old_compress_type = fs_info->compress_type; | |
1187 | u64 old_max_inline = fs_info->max_inline; | |
1188 | u64 old_alloc_start = fs_info->alloc_start; | |
1189 | int old_thread_pool_size = fs_info->thread_pool_size; | |
1190 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; | |
c146afad YZ |
1191 | int ret; |
1192 | ||
b288052e | 1193 | ret = btrfs_parse_options(root, data); |
49b25e05 JM |
1194 | if (ret) { |
1195 | ret = -EINVAL; | |
1196 | goto restore; | |
1197 | } | |
b288052e | 1198 | |
0d2450ab ST |
1199 | btrfs_resize_thread_pool(fs_info, |
1200 | fs_info->thread_pool_size, old_thread_pool_size); | |
1201 | ||
c146afad YZ |
1202 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1203 | return 0; | |
1204 | ||
1205 | if (*flags & MS_RDONLY) { | |
1206 | sb->s_flags |= MS_RDONLY; | |
1207 | ||
49b25e05 JM |
1208 | ret = btrfs_commit_super(root); |
1209 | if (ret) | |
1210 | goto restore; | |
c146afad | 1211 | } else { |
8a3db184 | 1212 | if (fs_info->fs_devices->rw_devices == 0) { |
49b25e05 JM |
1213 | ret = -EACCES; |
1214 | goto restore; | |
8a3db184 | 1215 | } |
2b82032c | 1216 | |
8a3db184 | 1217 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
49b25e05 JM |
1218 | ret = -EINVAL; |
1219 | goto restore; | |
8a3db184 | 1220 | } |
c146afad | 1221 | |
815745cf | 1222 | ret = btrfs_cleanup_fs_roots(fs_info); |
49b25e05 JM |
1223 | if (ret) |
1224 | goto restore; | |
c146afad | 1225 | |
d68fc57b YZ |
1226 | /* recover relocation */ |
1227 | ret = btrfs_recover_relocation(root); | |
49b25e05 JM |
1228 | if (ret) |
1229 | goto restore; | |
c146afad | 1230 | |
2b6ba629 ID |
1231 | ret = btrfs_resume_balance_async(fs_info); |
1232 | if (ret) | |
1233 | goto restore; | |
1234 | ||
c146afad YZ |
1235 | sb->s_flags &= ~MS_RDONLY; |
1236 | } | |
1237 | ||
1238 | return 0; | |
49b25e05 JM |
1239 | |
1240 | restore: | |
1241 | /* We've hit an error - don't reset MS_RDONLY */ | |
1242 | if (sb->s_flags & MS_RDONLY) | |
1243 | old_flags |= MS_RDONLY; | |
1244 | sb->s_flags = old_flags; | |
1245 | fs_info->mount_opt = old_opts; | |
1246 | fs_info->compress_type = old_compress_type; | |
1247 | fs_info->max_inline = old_max_inline; | |
1248 | fs_info->alloc_start = old_alloc_start; | |
0d2450ab ST |
1249 | btrfs_resize_thread_pool(fs_info, |
1250 | old_thread_pool_size, fs_info->thread_pool_size); | |
49b25e05 JM |
1251 | fs_info->metadata_ratio = old_metadata_ratio; |
1252 | return ret; | |
c146afad YZ |
1253 | } |
1254 | ||
bcd53741 AJ |
1255 | /* Used to sort the devices by max_avail(descending sort) */ |
1256 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
1257 | const void *dev_info2) | |
1258 | { | |
1259 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
1260 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1261 | return -1; | |
1262 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
1263 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
1264 | return 1; | |
1265 | else | |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * sort the devices by max_avail, in which max free extent size of each device | |
1271 | * is stored.(Descending Sort) | |
1272 | */ | |
1273 | static inline void btrfs_descending_sort_devices( | |
1274 | struct btrfs_device_info *devices, | |
1275 | size_t nr_devices) | |
1276 | { | |
1277 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1278 | btrfs_cmp_device_free_bytes, NULL); | |
1279 | } | |
1280 | ||
6d07bcec MX |
1281 | /* |
1282 | * The helper to calc the free space on the devices that can be used to store | |
1283 | * file data. | |
1284 | */ | |
1285 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
1286 | { | |
1287 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1288 | struct btrfs_device_info *devices_info; | |
1289 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1290 | struct btrfs_device *device; | |
1291 | u64 skip_space; | |
1292 | u64 type; | |
1293 | u64 avail_space; | |
1294 | u64 used_space; | |
1295 | u64 min_stripe_size; | |
39fb26c3 | 1296 | int min_stripes = 1, num_stripes = 1; |
6d07bcec MX |
1297 | int i = 0, nr_devices; |
1298 | int ret; | |
1299 | ||
b772a86e | 1300 | nr_devices = fs_info->fs_devices->open_devices; |
6d07bcec MX |
1301 | BUG_ON(!nr_devices); |
1302 | ||
1303 | devices_info = kmalloc(sizeof(*devices_info) * nr_devices, | |
1304 | GFP_NOFS); | |
1305 | if (!devices_info) | |
1306 | return -ENOMEM; | |
1307 | ||
1308 | /* calc min stripe number for data space alloction */ | |
1309 | type = btrfs_get_alloc_profile(root, 1); | |
39fb26c3 | 1310 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
6d07bcec | 1311 | min_stripes = 2; |
39fb26c3 MX |
1312 | num_stripes = nr_devices; |
1313 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { | |
6d07bcec | 1314 | min_stripes = 2; |
39fb26c3 MX |
1315 | num_stripes = 2; |
1316 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { | |
6d07bcec | 1317 | min_stripes = 4; |
39fb26c3 MX |
1318 | num_stripes = 4; |
1319 | } | |
6d07bcec MX |
1320 | |
1321 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1322 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
1323 | else | |
1324 | min_stripe_size = BTRFS_STRIPE_LEN; | |
1325 | ||
b772a86e LZ |
1326 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
1327 | if (!device->in_fs_metadata || !device->bdev) | |
6d07bcec MX |
1328 | continue; |
1329 | ||
1330 | avail_space = device->total_bytes - device->bytes_used; | |
1331 | ||
1332 | /* align with stripe_len */ | |
1333 | do_div(avail_space, BTRFS_STRIPE_LEN); | |
1334 | avail_space *= BTRFS_STRIPE_LEN; | |
1335 | ||
1336 | /* | |
1337 | * In order to avoid overwritting the superblock on the drive, | |
1338 | * btrfs starts at an offset of at least 1MB when doing chunk | |
1339 | * allocation. | |
1340 | */ | |
1341 | skip_space = 1024 * 1024; | |
1342 | ||
1343 | /* user can set the offset in fs_info->alloc_start. */ | |
1344 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1345 | device->total_bytes) | |
1346 | skip_space = max(fs_info->alloc_start, skip_space); | |
1347 | ||
1348 | /* | |
1349 | * btrfs can not use the free space in [0, skip_space - 1], | |
1350 | * we must subtract it from the total. In order to implement | |
1351 | * it, we account the used space in this range first. | |
1352 | */ | |
1353 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, | |
1354 | &used_space); | |
1355 | if (ret) { | |
1356 | kfree(devices_info); | |
1357 | return ret; | |
1358 | } | |
1359 | ||
1360 | /* calc the free space in [0, skip_space - 1] */ | |
1361 | skip_space -= used_space; | |
1362 | ||
1363 | /* | |
1364 | * we can use the free space in [0, skip_space - 1], subtract | |
1365 | * it from the total. | |
1366 | */ | |
1367 | if (avail_space && avail_space >= skip_space) | |
1368 | avail_space -= skip_space; | |
1369 | else | |
1370 | avail_space = 0; | |
1371 | ||
1372 | if (avail_space < min_stripe_size) | |
1373 | continue; | |
1374 | ||
1375 | devices_info[i].dev = device; | |
1376 | devices_info[i].max_avail = avail_space; | |
1377 | ||
1378 | i++; | |
1379 | } | |
1380 | ||
1381 | nr_devices = i; | |
1382 | ||
1383 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1384 | ||
1385 | i = nr_devices - 1; | |
1386 | avail_space = 0; | |
1387 | while (nr_devices >= min_stripes) { | |
39fb26c3 MX |
1388 | if (num_stripes > nr_devices) |
1389 | num_stripes = nr_devices; | |
1390 | ||
6d07bcec MX |
1391 | if (devices_info[i].max_avail >= min_stripe_size) { |
1392 | int j; | |
1393 | u64 alloc_size; | |
1394 | ||
39fb26c3 | 1395 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 1396 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 1397 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
1398 | devices_info[j].max_avail -= alloc_size; |
1399 | } | |
1400 | i--; | |
1401 | nr_devices--; | |
1402 | } | |
1403 | ||
1404 | kfree(devices_info); | |
1405 | *free_bytes = avail_space; | |
1406 | return 0; | |
1407 | } | |
1408 | ||
8fd17795 CM |
1409 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1410 | { | |
815745cf AV |
1411 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
1412 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
1413 | struct list_head *head = &fs_info->space_info; | |
bd4d1088 JB |
1414 | struct btrfs_space_info *found; |
1415 | u64 total_used = 0; | |
6d07bcec | 1416 | u64 total_free_data = 0; |
db94535d | 1417 | int bits = dentry->d_sb->s_blocksize_bits; |
815745cf | 1418 | __be32 *fsid = (__be32 *)fs_info->fsid; |
6d07bcec | 1419 | int ret; |
8fd17795 | 1420 | |
6d07bcec | 1421 | /* holding chunk_muext to avoid allocating new chunks */ |
815745cf | 1422 | mutex_lock(&fs_info->chunk_mutex); |
bd4d1088 | 1423 | rcu_read_lock(); |
89a55897 | 1424 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec MX |
1425 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
1426 | total_free_data += found->disk_total - found->disk_used; | |
1427 | total_free_data -= | |
1428 | btrfs_account_ro_block_groups_free_space(found); | |
1429 | } | |
1430 | ||
b742bb82 | 1431 | total_used += found->disk_used; |
89a55897 | 1432 | } |
bd4d1088 JB |
1433 | rcu_read_unlock(); |
1434 | ||
8fd17795 | 1435 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 1436 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 | 1437 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
8fd17795 CM |
1438 | buf->f_bsize = dentry->d_sb->s_blocksize; |
1439 | buf->f_type = BTRFS_SUPER_MAGIC; | |
6d07bcec | 1440 | buf->f_bavail = total_free_data; |
815745cf | 1441 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
6d07bcec | 1442 | if (ret) { |
815745cf | 1443 | mutex_unlock(&fs_info->chunk_mutex); |
6d07bcec MX |
1444 | return ret; |
1445 | } | |
1446 | buf->f_bavail += total_free_data; | |
1447 | buf->f_bavail = buf->f_bavail >> bits; | |
815745cf | 1448 | mutex_unlock(&fs_info->chunk_mutex); |
d397712b | 1449 | |
9d03632e | 1450 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 1451 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
1452 | on a big-endian or little-endian host */ |
1453 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
1454 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
1455 | /* Mask in the root object ID too, to disambiguate subvols */ |
1456 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
1457 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
1458 | ||
8fd17795 CM |
1459 | return 0; |
1460 | } | |
b5133862 | 1461 | |
aea52e19 AV |
1462 | static void btrfs_kill_super(struct super_block *sb) |
1463 | { | |
815745cf | 1464 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 1465 | kill_anon_super(sb); |
d22ca7de | 1466 | free_fs_info(fs_info); |
aea52e19 AV |
1467 | } |
1468 | ||
2e635a27 CM |
1469 | static struct file_system_type btrfs_fs_type = { |
1470 | .owner = THIS_MODULE, | |
1471 | .name = "btrfs", | |
061dbc6b | 1472 | .mount = btrfs_mount, |
aea52e19 | 1473 | .kill_sb = btrfs_kill_super, |
2e635a27 CM |
1474 | .fs_flags = FS_REQUIRES_DEV, |
1475 | }; | |
a9218f6b | 1476 | |
d352ac68 CM |
1477 | /* |
1478 | * used by btrfsctl to scan devices when no FS is mounted | |
1479 | */ | |
8a4b83cc CM |
1480 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
1481 | unsigned long arg) | |
1482 | { | |
1483 | struct btrfs_ioctl_vol_args *vol; | |
1484 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 1485 | int ret = -ENOTTY; |
8a4b83cc | 1486 | |
e441d54d CM |
1487 | if (!capable(CAP_SYS_ADMIN)) |
1488 | return -EPERM; | |
1489 | ||
dae7b665 LZ |
1490 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
1491 | if (IS_ERR(vol)) | |
1492 | return PTR_ERR(vol); | |
c071fcfd | 1493 | |
8a4b83cc CM |
1494 | switch (cmd) { |
1495 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 1496 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
1497 | &btrfs_fs_type, &fs_devices); |
1498 | break; | |
02db0844 JB |
1499 | case BTRFS_IOC_DEVICES_READY: |
1500 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, | |
1501 | &btrfs_fs_type, &fs_devices); | |
1502 | if (ret) | |
1503 | break; | |
1504 | ret = !(fs_devices->num_devices == fs_devices->total_devices); | |
1505 | break; | |
8a4b83cc | 1506 | } |
dae7b665 | 1507 | |
8a4b83cc | 1508 | kfree(vol); |
f819d837 | 1509 | return ret; |
8a4b83cc CM |
1510 | } |
1511 | ||
0176260f | 1512 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 1513 | { |
354aa0fb MX |
1514 | struct btrfs_trans_handle *trans; |
1515 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; | |
1516 | ||
1517 | trans = btrfs_attach_transaction(root); | |
1518 | if (IS_ERR(trans)) { | |
1519 | /* no transaction, don't bother */ | |
1520 | if (PTR_ERR(trans) == -ENOENT) | |
1521 | return 0; | |
1522 | return PTR_ERR(trans); | |
1523 | } | |
1524 | return btrfs_commit_transaction(trans, root); | |
ed0dab6b Y |
1525 | } |
1526 | ||
0176260f | 1527 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b | 1528 | { |
0176260f | 1529 | return 0; |
ed0dab6b | 1530 | } |
2e635a27 | 1531 | |
9c5085c1 JB |
1532 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
1533 | { | |
1534 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
1535 | struct btrfs_fs_devices *cur_devices; | |
1536 | struct btrfs_device *dev, *first_dev = NULL; | |
1537 | struct list_head *head; | |
1538 | struct rcu_string *name; | |
1539 | ||
1540 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
1541 | cur_devices = fs_info->fs_devices; | |
1542 | while (cur_devices) { | |
1543 | head = &cur_devices->devices; | |
1544 | list_for_each_entry(dev, head, dev_list) { | |
aa9ddcd4 JB |
1545 | if (dev->missing) |
1546 | continue; | |
9c5085c1 JB |
1547 | if (!first_dev || dev->devid < first_dev->devid) |
1548 | first_dev = dev; | |
1549 | } | |
1550 | cur_devices = cur_devices->seed; | |
1551 | } | |
1552 | ||
1553 | if (first_dev) { | |
1554 | rcu_read_lock(); | |
1555 | name = rcu_dereference(first_dev->name); | |
1556 | seq_escape(m, name->str, " \t\n\\"); | |
1557 | rcu_read_unlock(); | |
1558 | } else { | |
1559 | WARN_ON(1); | |
1560 | } | |
1561 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
1562 | return 0; | |
1563 | } | |
1564 | ||
b87221de | 1565 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 1566 | .drop_inode = btrfs_drop_inode, |
bd555975 | 1567 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 1568 | .put_super = btrfs_put_super, |
d5719762 | 1569 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 1570 | .show_options = btrfs_show_options, |
9c5085c1 | 1571 | .show_devname = btrfs_show_devname, |
4730a4bc | 1572 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
1573 | .alloc_inode = btrfs_alloc_inode, |
1574 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 1575 | .statfs = btrfs_statfs, |
c146afad | 1576 | .remount_fs = btrfs_remount, |
0176260f LT |
1577 | .freeze_fs = btrfs_freeze, |
1578 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 1579 | }; |
a9218f6b CM |
1580 | |
1581 | static const struct file_operations btrfs_ctl_fops = { | |
1582 | .unlocked_ioctl = btrfs_control_ioctl, | |
1583 | .compat_ioctl = btrfs_control_ioctl, | |
1584 | .owner = THIS_MODULE, | |
6038f373 | 1585 | .llseek = noop_llseek, |
a9218f6b CM |
1586 | }; |
1587 | ||
1588 | static struct miscdevice btrfs_misc = { | |
578454ff | 1589 | .minor = BTRFS_MINOR, |
a9218f6b CM |
1590 | .name = "btrfs-control", |
1591 | .fops = &btrfs_ctl_fops | |
1592 | }; | |
1593 | ||
578454ff KS |
1594 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
1595 | MODULE_ALIAS("devname:btrfs-control"); | |
1596 | ||
a9218f6b CM |
1597 | static int btrfs_interface_init(void) |
1598 | { | |
1599 | return misc_register(&btrfs_misc); | |
1600 | } | |
1601 | ||
b2950863 | 1602 | static void btrfs_interface_exit(void) |
a9218f6b CM |
1603 | { |
1604 | if (misc_deregister(&btrfs_misc) < 0) | |
d397712b | 1605 | printk(KERN_INFO "misc_deregister failed for control device"); |
a9218f6b CM |
1606 | } |
1607 | ||
2e635a27 CM |
1608 | static int __init init_btrfs_fs(void) |
1609 | { | |
2c90e5d6 | 1610 | int err; |
58176a96 JB |
1611 | |
1612 | err = btrfs_init_sysfs(); | |
1613 | if (err) | |
1614 | return err; | |
1615 | ||
143bede5 | 1616 | btrfs_init_compress(); |
d1310b2e | 1617 | |
261507a0 LZ |
1618 | err = btrfs_init_cachep(); |
1619 | if (err) | |
1620 | goto free_compress; | |
1621 | ||
d1310b2e | 1622 | err = extent_io_init(); |
2f4cbe64 WB |
1623 | if (err) |
1624 | goto free_cachep; | |
1625 | ||
d1310b2e CM |
1626 | err = extent_map_init(); |
1627 | if (err) | |
1628 | goto free_extent_io; | |
1629 | ||
6352b91d | 1630 | err = ordered_data_init(); |
2f4cbe64 WB |
1631 | if (err) |
1632 | goto free_extent_map; | |
c8b97818 | 1633 | |
6352b91d MX |
1634 | err = btrfs_delayed_inode_init(); |
1635 | if (err) | |
1636 | goto free_ordered_data; | |
1637 | ||
16cdcec7 MX |
1638 | err = btrfs_interface_init(); |
1639 | if (err) | |
1640 | goto free_delayed_inode; | |
1641 | ||
a9218f6b CM |
1642 | err = register_filesystem(&btrfs_fs_type); |
1643 | if (err) | |
1644 | goto unregister_ioctl; | |
b3c3da71 | 1645 | |
e565d4b9 JS |
1646 | btrfs_init_lockdep(); |
1647 | ||
b3c3da71 | 1648 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); |
2f4cbe64 WB |
1649 | return 0; |
1650 | ||
a9218f6b CM |
1651 | unregister_ioctl: |
1652 | btrfs_interface_exit(); | |
16cdcec7 MX |
1653 | free_delayed_inode: |
1654 | btrfs_delayed_inode_exit(); | |
6352b91d MX |
1655 | free_ordered_data: |
1656 | ordered_data_exit(); | |
2f4cbe64 WB |
1657 | free_extent_map: |
1658 | extent_map_exit(); | |
d1310b2e CM |
1659 | free_extent_io: |
1660 | extent_io_exit(); | |
2f4cbe64 WB |
1661 | free_cachep: |
1662 | btrfs_destroy_cachep(); | |
261507a0 LZ |
1663 | free_compress: |
1664 | btrfs_exit_compress(); | |
2f4cbe64 WB |
1665 | btrfs_exit_sysfs(); |
1666 | return err; | |
2e635a27 CM |
1667 | } |
1668 | ||
1669 | static void __exit exit_btrfs_fs(void) | |
1670 | { | |
39279cc3 | 1671 | btrfs_destroy_cachep(); |
16cdcec7 | 1672 | btrfs_delayed_inode_exit(); |
6352b91d | 1673 | ordered_data_exit(); |
a52d9a80 | 1674 | extent_map_exit(); |
d1310b2e | 1675 | extent_io_exit(); |
a9218f6b | 1676 | btrfs_interface_exit(); |
2e635a27 | 1677 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 1678 | btrfs_exit_sysfs(); |
8a4b83cc | 1679 | btrfs_cleanup_fs_uuids(); |
261507a0 | 1680 | btrfs_exit_compress(); |
2e635a27 CM |
1681 | } |
1682 | ||
1683 | module_init(init_btrfs_fs) | |
1684 | module_exit(exit_btrfs_fs) | |
1685 | ||
1686 | MODULE_LICENSE("GPL"); |