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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> |
4b4e25f2 | 43 | #include "compat.h" |
16cdcec7 | 44 | #include "delayed-inode.h" |
2e635a27 | 45 | #include "ctree.h" |
e20d96d6 | 46 | #include "disk-io.h" |
d5719762 | 47 | #include "transaction.h" |
2c90e5d6 | 48 | #include "btrfs_inode.h" |
c5739bba | 49 | #include "ioctl.h" |
3a686375 | 50 | #include "print-tree.h" |
5103e947 | 51 | #include "xattr.h" |
8a4b83cc | 52 | #include "volumes.h" |
b3c3da71 | 53 | #include "version.h" |
be6e8dc0 | 54 | #include "export.h" |
c8b97818 | 55 | #include "compression.h" |
2e635a27 | 56 | |
1abe9b8a | 57 | #define CREATE_TRACE_POINTS |
58 | #include <trace/events/btrfs.h> | |
59 | ||
b87221de | 60 | static const struct super_operations btrfs_super_ops; |
75dfe396 | 61 | |
acce952b | 62 | static const char *btrfs_decode_error(struct btrfs_fs_info *fs_info, int errno, |
63 | char nbuf[16]) | |
64 | { | |
65 | char *errstr = NULL; | |
66 | ||
67 | switch (errno) { | |
68 | case -EIO: | |
69 | errstr = "IO failure"; | |
70 | break; | |
71 | case -ENOMEM: | |
72 | errstr = "Out of memory"; | |
73 | break; | |
74 | case -EROFS: | |
75 | errstr = "Readonly filesystem"; | |
76 | break; | |
77 | default: | |
78 | if (nbuf) { | |
79 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
80 | errstr = nbuf; | |
81 | } | |
82 | break; | |
83 | } | |
84 | ||
85 | return errstr; | |
86 | } | |
87 | ||
88 | static void __save_error_info(struct btrfs_fs_info *fs_info) | |
89 | { | |
90 | /* | |
91 | * today we only save the error info into ram. Long term we'll | |
92 | * also send it down to the disk | |
93 | */ | |
94 | fs_info->fs_state = BTRFS_SUPER_FLAG_ERROR; | |
95 | } | |
96 | ||
97 | /* NOTE: | |
98 | * We move write_super stuff at umount in order to avoid deadlock | |
99 | * for umount hold all lock. | |
100 | */ | |
101 | static void save_error_info(struct btrfs_fs_info *fs_info) | |
102 | { | |
103 | __save_error_info(fs_info); | |
104 | } | |
105 | ||
106 | /* btrfs handle error by forcing the filesystem readonly */ | |
107 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) | |
108 | { | |
109 | struct super_block *sb = fs_info->sb; | |
110 | ||
111 | if (sb->s_flags & MS_RDONLY) | |
112 | return; | |
113 | ||
114 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { | |
115 | sb->s_flags |= MS_RDONLY; | |
116 | printk(KERN_INFO "btrfs is forced readonly\n"); | |
117 | } | |
118 | } | |
119 | ||
120 | /* | |
121 | * __btrfs_std_error decodes expected errors from the caller and | |
122 | * invokes the approciate error response. | |
123 | */ | |
124 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, | |
125 | unsigned int line, int errno) | |
126 | { | |
127 | struct super_block *sb = fs_info->sb; | |
128 | char nbuf[16]; | |
129 | const char *errstr; | |
130 | ||
131 | /* | |
132 | * Special case: if the error is EROFS, and we're already | |
133 | * under MS_RDONLY, then it is safe here. | |
134 | */ | |
135 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) | |
136 | return; | |
137 | ||
138 | errstr = btrfs_decode_error(fs_info, errno, nbuf); | |
139 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n", | |
140 | sb->s_id, function, line, errstr); | |
141 | save_error_info(fs_info); | |
142 | ||
143 | btrfs_handle_error(fs_info); | |
144 | } | |
145 | ||
d397712b | 146 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 147 | { |
39279cc3 | 148 | struct btrfs_root *root = btrfs_sb(sb); |
b18c6685 | 149 | int ret; |
b18c6685 | 150 | |
39279cc3 | 151 | ret = close_ctree(root); |
39279cc3 | 152 | sb->s_fs_info = NULL; |
559af821 AK |
153 | |
154 | (void)ret; /* FIXME: need to fix VFS to return error? */ | |
75dfe396 CM |
155 | } |
156 | ||
95e05289 | 157 | enum { |
73f73415 | 158 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
159 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
160 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
261507a0 LZ |
161 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
162 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, | |
91435650 | 163 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
4b9465cb CM |
164 | Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, |
165 | Opt_inode_cache, Opt_err, | |
95e05289 CM |
166 | }; |
167 | ||
168 | static match_table_t tokens = { | |
dfe25020 | 169 | {Opt_degraded, "degraded"}, |
95e05289 | 170 | {Opt_subvol, "subvol=%s"}, |
73f73415 | 171 | {Opt_subvolid, "subvolid=%d"}, |
43e570b0 | 172 | {Opt_device, "device=%s"}, |
b6cda9bc | 173 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 174 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 175 | {Opt_nobarrier, "nobarrier"}, |
6f568d35 | 176 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 177 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 178 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 179 | {Opt_compress, "compress"}, |
261507a0 | 180 | {Opt_compress_type, "compress=%s"}, |
a555f810 | 181 | {Opt_compress_force, "compress-force"}, |
261507a0 | 182 | {Opt_compress_force_type, "compress-force=%s"}, |
e18e4809 | 183 | {Opt_ssd, "ssd"}, |
451d7585 | 184 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 185 | {Opt_nossd, "nossd"}, |
33268eaf | 186 | {Opt_noacl, "noacl"}, |
3a5e1404 | 187 | {Opt_notreelog, "notreelog"}, |
dccae999 | 188 | {Opt_flushoncommit, "flushoncommit"}, |
97e728d4 | 189 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 190 | {Opt_discard, "discard"}, |
0af3d00b | 191 | {Opt_space_cache, "space_cache"}, |
88c2ba3b | 192 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 193 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
91435650 | 194 | {Opt_enospc_debug, "enospc_debug"}, |
e15d0542 | 195 | {Opt_subvolrootid, "subvolrootid=%d"}, |
4cb5300b | 196 | {Opt_defrag, "autodefrag"}, |
4b9465cb | 197 | {Opt_inode_cache, "inode_cache"}, |
33268eaf | 198 | {Opt_err, NULL}, |
95e05289 CM |
199 | }; |
200 | ||
edf24abe CH |
201 | /* |
202 | * Regular mount options parser. Everything that is needed only when | |
203 | * reading in a new superblock is parsed here. | |
204 | */ | |
205 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 206 | { |
edf24abe | 207 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 208 | substring_t args[MAX_OPT_ARGS]; |
da495ecc | 209 | char *p, *num, *orig; |
4543df7e | 210 | int intarg; |
a7a3f7ca | 211 | int ret = 0; |
261507a0 LZ |
212 | char *compress_type; |
213 | bool compress_force = false; | |
b6cda9bc | 214 | |
95e05289 | 215 | if (!options) |
edf24abe | 216 | return 0; |
95e05289 | 217 | |
be20aa9d CM |
218 | /* |
219 | * strsep changes the string, duplicate it because parse_options | |
220 | * gets called twice | |
221 | */ | |
222 | options = kstrdup(options, GFP_NOFS); | |
223 | if (!options) | |
224 | return -ENOMEM; | |
225 | ||
da495ecc | 226 | orig = options; |
be20aa9d | 227 | |
edf24abe | 228 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
229 | int token; |
230 | if (!*p) | |
231 | continue; | |
232 | ||
233 | token = match_token(p, tokens, args); | |
234 | switch (token) { | |
dfe25020 | 235 | case Opt_degraded: |
edf24abe CH |
236 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
237 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 238 | break; |
95e05289 | 239 | case Opt_subvol: |
73f73415 | 240 | case Opt_subvolid: |
e15d0542 | 241 | case Opt_subvolrootid: |
43e570b0 | 242 | case Opt_device: |
edf24abe | 243 | /* |
43e570b0 | 244 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
245 | * and can be happily ignored here. |
246 | */ | |
b6cda9bc CM |
247 | break; |
248 | case Opt_nodatasum: | |
067c28ad | 249 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
edf24abe | 250 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
251 | break; |
252 | case Opt_nodatacow: | |
edf24abe CH |
253 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
254 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
255 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 256 | break; |
a555f810 | 257 | case Opt_compress_force: |
261507a0 LZ |
258 | case Opt_compress_force_type: |
259 | compress_force = true; | |
260 | case Opt_compress: | |
261 | case Opt_compress_type: | |
262 | if (token == Opt_compress || | |
263 | token == Opt_compress_force || | |
264 | strcmp(args[0].from, "zlib") == 0) { | |
265 | compress_type = "zlib"; | |
266 | info->compress_type = BTRFS_COMPRESS_ZLIB; | |
a6fa6fae LZ |
267 | } else if (strcmp(args[0].from, "lzo") == 0) { |
268 | compress_type = "lzo"; | |
269 | info->compress_type = BTRFS_COMPRESS_LZO; | |
261507a0 LZ |
270 | } else { |
271 | ret = -EINVAL; | |
272 | goto out; | |
273 | } | |
274 | ||
a555f810 | 275 | btrfs_set_opt(info->mount_opt, COMPRESS); |
261507a0 LZ |
276 | if (compress_force) { |
277 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
278 | pr_info("btrfs: force %s compression\n", | |
279 | compress_type); | |
280 | } else | |
281 | pr_info("btrfs: use %s compression\n", | |
282 | compress_type); | |
a555f810 | 283 | break; |
e18e4809 | 284 | case Opt_ssd: |
edf24abe CH |
285 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
286 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 287 | break; |
451d7585 CM |
288 | case Opt_ssd_spread: |
289 | printk(KERN_INFO "btrfs: use spread ssd " | |
290 | "allocation scheme\n"); | |
291 | btrfs_set_opt(info->mount_opt, SSD); | |
292 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
293 | break; | |
3b30c22f | 294 | case Opt_nossd: |
451d7585 CM |
295 | printk(KERN_INFO "btrfs: not using ssd allocation " |
296 | "scheme\n"); | |
c289811c | 297 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 298 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 299 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 300 | break; |
21ad10cf | 301 | case Opt_nobarrier: |
edf24abe CH |
302 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
303 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 304 | break; |
4543df7e CM |
305 | case Opt_thread_pool: |
306 | intarg = 0; | |
307 | match_int(&args[0], &intarg); | |
308 | if (intarg) { | |
309 | info->thread_pool_size = intarg; | |
310 | printk(KERN_INFO "btrfs: thread pool %d\n", | |
311 | info->thread_pool_size); | |
312 | } | |
313 | break; | |
6f568d35 | 314 | case Opt_max_inline: |
edf24abe CH |
315 | num = match_strdup(&args[0]); |
316 | if (num) { | |
91748467 | 317 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
318 | kfree(num); |
319 | ||
15ada040 CM |
320 | if (info->max_inline) { |
321 | info->max_inline = max_t(u64, | |
322 | info->max_inline, | |
323 | root->sectorsize); | |
324 | } | |
edf24abe | 325 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
21380931 | 326 | (unsigned long long)info->max_inline); |
6f568d35 CM |
327 | } |
328 | break; | |
8f662a76 | 329 | case Opt_alloc_start: |
edf24abe CH |
330 | num = match_strdup(&args[0]); |
331 | if (num) { | |
91748467 | 332 | info->alloc_start = memparse(num, NULL); |
edf24abe CH |
333 | kfree(num); |
334 | printk(KERN_INFO | |
335 | "btrfs: allocations start at %llu\n", | |
21380931 | 336 | (unsigned long long)info->alloc_start); |
8f662a76 CM |
337 | } |
338 | break; | |
33268eaf JB |
339 | case Opt_noacl: |
340 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
341 | break; | |
3a5e1404 SW |
342 | case Opt_notreelog: |
343 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
344 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
345 | break; | |
dccae999 SW |
346 | case Opt_flushoncommit: |
347 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
348 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
349 | break; | |
97e728d4 JB |
350 | case Opt_ratio: |
351 | intarg = 0; | |
352 | match_int(&args[0], &intarg); | |
353 | if (intarg) { | |
354 | info->metadata_ratio = intarg; | |
355 | printk(KERN_INFO "btrfs: metadata ratio %d\n", | |
356 | info->metadata_ratio); | |
357 | } | |
358 | break; | |
e244a0ae CH |
359 | case Opt_discard: |
360 | btrfs_set_opt(info->mount_opt, DISCARD); | |
361 | break; | |
0af3d00b JB |
362 | case Opt_space_cache: |
363 | printk(KERN_INFO "btrfs: enabling disk space caching\n"); | |
364 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); | |
0de90876 | 365 | break; |
4b9465cb CM |
366 | case Opt_inode_cache: |
367 | printk(KERN_INFO "btrfs: enabling inode map caching\n"); | |
368 | btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); | |
369 | break; | |
88c2ba3b JB |
370 | case Opt_clear_cache: |
371 | printk(KERN_INFO "btrfs: force clearing of disk cache\n"); | |
372 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); | |
0af3d00b | 373 | break; |
4260f7c7 SW |
374 | case Opt_user_subvol_rm_allowed: |
375 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
376 | break; | |
91435650 CM |
377 | case Opt_enospc_debug: |
378 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); | |
379 | break; | |
4cb5300b CM |
380 | case Opt_defrag: |
381 | printk(KERN_INFO "btrfs: enabling auto defrag"); | |
382 | btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); | |
383 | break; | |
a7a3f7ca SW |
384 | case Opt_err: |
385 | printk(KERN_INFO "btrfs: unrecognized mount option " | |
386 | "'%s'\n", p); | |
387 | ret = -EINVAL; | |
388 | goto out; | |
95e05289 | 389 | default: |
be20aa9d | 390 | break; |
95e05289 CM |
391 | } |
392 | } | |
a7a3f7ca | 393 | out: |
da495ecc | 394 | kfree(orig); |
a7a3f7ca | 395 | return ret; |
edf24abe CH |
396 | } |
397 | ||
398 | /* | |
399 | * Parse mount options that are required early in the mount process. | |
400 | * | |
401 | * All other options will be parsed on much later in the mount process and | |
402 | * only when we need to allocate a new super block. | |
403 | */ | |
97288f2c | 404 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 405 | void *holder, char **subvol_name, u64 *subvol_objectid, |
e15d0542 | 406 | u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
407 | { |
408 | substring_t args[MAX_OPT_ARGS]; | |
3f3d0bc0 | 409 | char *opts, *orig, *p; |
edf24abe | 410 | int error = 0; |
73f73415 | 411 | int intarg; |
edf24abe CH |
412 | |
413 | if (!options) | |
414 | goto out; | |
415 | ||
416 | /* | |
417 | * strsep changes the string, duplicate it because parse_options | |
418 | * gets called twice | |
419 | */ | |
420 | opts = kstrdup(options, GFP_KERNEL); | |
421 | if (!opts) | |
422 | return -ENOMEM; | |
3f3d0bc0 | 423 | orig = opts; |
edf24abe CH |
424 | |
425 | while ((p = strsep(&opts, ",")) != NULL) { | |
426 | int token; | |
427 | if (!*p) | |
428 | continue; | |
429 | ||
430 | token = match_token(p, tokens, args); | |
431 | switch (token) { | |
432 | case Opt_subvol: | |
433 | *subvol_name = match_strdup(&args[0]); | |
434 | break; | |
73f73415 JB |
435 | case Opt_subvolid: |
436 | intarg = 0; | |
4849f01d JB |
437 | error = match_int(&args[0], &intarg); |
438 | if (!error) { | |
439 | /* we want the original fs_tree */ | |
440 | if (!intarg) | |
441 | *subvol_objectid = | |
442 | BTRFS_FS_TREE_OBJECTID; | |
443 | else | |
444 | *subvol_objectid = intarg; | |
445 | } | |
73f73415 | 446 | break; |
e15d0542 XZ |
447 | case Opt_subvolrootid: |
448 | intarg = 0; | |
449 | error = match_int(&args[0], &intarg); | |
450 | if (!error) { | |
451 | /* we want the original fs_tree */ | |
452 | if (!intarg) | |
453 | *subvol_rootid = | |
454 | BTRFS_FS_TREE_OBJECTID; | |
455 | else | |
456 | *subvol_rootid = intarg; | |
457 | } | |
458 | break; | |
43e570b0 CH |
459 | case Opt_device: |
460 | error = btrfs_scan_one_device(match_strdup(&args[0]), | |
461 | flags, holder, fs_devices); | |
462 | if (error) | |
463 | goto out_free_opts; | |
464 | break; | |
edf24abe CH |
465 | default: |
466 | break; | |
467 | } | |
468 | } | |
469 | ||
43e570b0 | 470 | out_free_opts: |
3f3d0bc0 | 471 | kfree(orig); |
edf24abe CH |
472 | out: |
473 | /* | |
474 | * If no subvolume name is specified we use the default one. Allocate | |
3de4586c | 475 | * a copy of the string "." here so that code later in the |
edf24abe CH |
476 | * mount path doesn't care if it's the default volume or another one. |
477 | */ | |
478 | if (!*subvol_name) { | |
3de4586c | 479 | *subvol_name = kstrdup(".", GFP_KERNEL); |
edf24abe CH |
480 | if (!*subvol_name) |
481 | return -ENOMEM; | |
482 | } | |
483 | return error; | |
95e05289 CM |
484 | } |
485 | ||
73f73415 JB |
486 | static struct dentry *get_default_root(struct super_block *sb, |
487 | u64 subvol_objectid) | |
488 | { | |
489 | struct btrfs_root *root = sb->s_fs_info; | |
490 | struct btrfs_root *new_root; | |
491 | struct btrfs_dir_item *di; | |
492 | struct btrfs_path *path; | |
493 | struct btrfs_key location; | |
494 | struct inode *inode; | |
73f73415 JB |
495 | u64 dir_id; |
496 | int new = 0; | |
497 | ||
498 | /* | |
499 | * We have a specific subvol we want to mount, just setup location and | |
500 | * go look up the root. | |
501 | */ | |
502 | if (subvol_objectid) { | |
503 | location.objectid = subvol_objectid; | |
504 | location.type = BTRFS_ROOT_ITEM_KEY; | |
505 | location.offset = (u64)-1; | |
506 | goto find_root; | |
507 | } | |
508 | ||
509 | path = btrfs_alloc_path(); | |
510 | if (!path) | |
511 | return ERR_PTR(-ENOMEM); | |
512 | path->leave_spinning = 1; | |
513 | ||
514 | /* | |
515 | * Find the "default" dir item which points to the root item that we | |
516 | * will mount by default if we haven't been given a specific subvolume | |
517 | * to mount. | |
518 | */ | |
519 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); | |
520 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); | |
b0839166 JL |
521 | if (IS_ERR(di)) { |
522 | btrfs_free_path(path); | |
fb4f6f91 | 523 | return ERR_CAST(di); |
b0839166 | 524 | } |
73f73415 JB |
525 | if (!di) { |
526 | /* | |
527 | * Ok the default dir item isn't there. This is weird since | |
528 | * it's always been there, but don't freak out, just try and | |
529 | * mount to root most subvolume. | |
530 | */ | |
531 | btrfs_free_path(path); | |
532 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
533 | new_root = root->fs_info->fs_root; | |
534 | goto setup_root; | |
535 | } | |
536 | ||
537 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
538 | btrfs_free_path(path); | |
539 | ||
540 | find_root: | |
541 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
542 | if (IS_ERR(new_root)) | |
d0b678cb | 543 | return ERR_CAST(new_root); |
73f73415 JB |
544 | |
545 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
546 | return ERR_PTR(-ENOENT); | |
547 | ||
548 | dir_id = btrfs_root_dirid(&new_root->root_item); | |
549 | setup_root: | |
550 | location.objectid = dir_id; | |
551 | location.type = BTRFS_INODE_ITEM_KEY; | |
552 | location.offset = 0; | |
553 | ||
554 | inode = btrfs_iget(sb, &location, new_root, &new); | |
4cbd1149 DC |
555 | if (IS_ERR(inode)) |
556 | return ERR_CAST(inode); | |
73f73415 JB |
557 | |
558 | /* | |
559 | * If we're just mounting the root most subvol put the inode and return | |
560 | * a reference to the dentry. We will have already gotten a reference | |
561 | * to the inode in btrfs_fill_super so we're good to go. | |
562 | */ | |
563 | if (!new && sb->s_root->d_inode == inode) { | |
564 | iput(inode); | |
565 | return dget(sb->s_root); | |
566 | } | |
567 | ||
ba5b8958 | 568 | return d_obtain_alias(inode); |
73f73415 JB |
569 | } |
570 | ||
d397712b | 571 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 572 | struct btrfs_fs_devices *fs_devices, |
d397712b | 573 | void *data, int silent) |
75dfe396 | 574 | { |
d397712b CM |
575 | struct inode *inode; |
576 | struct dentry *root_dentry; | |
39279cc3 | 577 | struct btrfs_root *tree_root; |
5d4f98a2 | 578 | struct btrfs_key key; |
39279cc3 | 579 | int err; |
a429e513 | 580 | |
39279cc3 CM |
581 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
582 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
583 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 584 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 585 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 586 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 587 | sb->s_time_gran = 1; |
0eda294d | 588 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 589 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 590 | #endif |
a429e513 | 591 | |
dfe25020 | 592 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
6567e837 | 593 | |
e58ca020 | 594 | if (IS_ERR(tree_root)) { |
39279cc3 | 595 | printk("btrfs: open_ctree failed\n"); |
e58ca020 | 596 | return PTR_ERR(tree_root); |
a429e513 | 597 | } |
39279cc3 | 598 | sb->s_fs_info = tree_root; |
a429e513 | 599 | |
5d4f98a2 YZ |
600 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
601 | key.type = BTRFS_INODE_ITEM_KEY; | |
602 | key.offset = 0; | |
73f73415 | 603 | inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL); |
5d4f98a2 YZ |
604 | if (IS_ERR(inode)) { |
605 | err = PTR_ERR(inode); | |
39279cc3 | 606 | goto fail_close; |
f254e52c | 607 | } |
f254e52c | 608 | |
39279cc3 CM |
609 | root_dentry = d_alloc_root(inode); |
610 | if (!root_dentry) { | |
611 | iput(inode); | |
612 | err = -ENOMEM; | |
613 | goto fail_close; | |
f254e52c | 614 | } |
58176a96 | 615 | |
39279cc3 | 616 | sb->s_root = root_dentry; |
6885f308 | 617 | |
6885f308 | 618 | save_mount_options(sb, data); |
90a887c9 | 619 | cleancache_init_fs(sb); |
2619ba1f | 620 | return 0; |
39279cc3 CM |
621 | |
622 | fail_close: | |
623 | close_ctree(tree_root); | |
624 | return err; | |
2619ba1f CM |
625 | } |
626 | ||
6bf13c0c | 627 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
628 | { |
629 | struct btrfs_trans_handle *trans; | |
dccae999 | 630 | struct btrfs_root *root = btrfs_sb(sb); |
c5739bba | 631 | int ret; |
2619ba1f | 632 | |
1abe9b8a | 633 | trace_btrfs_sync_fs(wait); |
634 | ||
39279cc3 CM |
635 | if (!wait) { |
636 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
637 | return 0; | |
638 | } | |
771ed689 | 639 | |
24bbcf04 YZ |
640 | btrfs_start_delalloc_inodes(root, 0); |
641 | btrfs_wait_ordered_extents(root, 0, 0); | |
771ed689 | 642 | |
a22285a6 | 643 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
644 | if (IS_ERR(trans)) |
645 | return PTR_ERR(trans); | |
c5739bba | 646 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d | 647 | return ret; |
2c90e5d6 CM |
648 | } |
649 | ||
a9572a15 EP |
650 | static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
651 | { | |
652 | struct btrfs_root *root = btrfs_sb(vfs->mnt_sb); | |
653 | struct btrfs_fs_info *info = root->fs_info; | |
200da64e | 654 | char *compress_type; |
a9572a15 EP |
655 | |
656 | if (btrfs_test_opt(root, DEGRADED)) | |
657 | seq_puts(seq, ",degraded"); | |
658 | if (btrfs_test_opt(root, NODATASUM)) | |
659 | seq_puts(seq, ",nodatasum"); | |
660 | if (btrfs_test_opt(root, NODATACOW)) | |
661 | seq_puts(seq, ",nodatacow"); | |
662 | if (btrfs_test_opt(root, NOBARRIER)) | |
663 | seq_puts(seq, ",nobarrier"); | |
a9572a15 | 664 | if (info->max_inline != 8192 * 1024) |
21380931 JB |
665 | seq_printf(seq, ",max_inline=%llu", |
666 | (unsigned long long)info->max_inline); | |
a9572a15 | 667 | if (info->alloc_start != 0) |
21380931 JB |
668 | seq_printf(seq, ",alloc_start=%llu", |
669 | (unsigned long long)info->alloc_start); | |
a9572a15 EP |
670 | if (info->thread_pool_size != min_t(unsigned long, |
671 | num_online_cpus() + 2, 8)) | |
672 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
200da64e TI |
673 | if (btrfs_test_opt(root, COMPRESS)) { |
674 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) | |
675 | compress_type = "zlib"; | |
676 | else | |
677 | compress_type = "lzo"; | |
678 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
679 | seq_printf(seq, ",compress-force=%s", compress_type); | |
680 | else | |
681 | seq_printf(seq, ",compress=%s", compress_type); | |
682 | } | |
c289811c CM |
683 | if (btrfs_test_opt(root, NOSSD)) |
684 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
685 | if (btrfs_test_opt(root, SSD_SPREAD)) |
686 | seq_puts(seq, ",ssd_spread"); | |
687 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 688 | seq_puts(seq, ",ssd"); |
3a5e1404 | 689 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 690 | seq_puts(seq, ",notreelog"); |
dccae999 | 691 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 692 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
693 | if (btrfs_test_opt(root, DISCARD)) |
694 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
695 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
696 | seq_puts(seq, ",noacl"); | |
200da64e TI |
697 | if (btrfs_test_opt(root, SPACE_CACHE)) |
698 | seq_puts(seq, ",space_cache"); | |
699 | if (btrfs_test_opt(root, CLEAR_CACHE)) | |
700 | seq_puts(seq, ",clear_cache"); | |
701 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
702 | seq_puts(seq, ",user_subvol_rm_allowed"); | |
0942caa3 DS |
703 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
704 | seq_puts(seq, ",enospc_debug"); | |
705 | if (btrfs_test_opt(root, AUTO_DEFRAG)) | |
706 | seq_puts(seq, ",autodefrag"); | |
707 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) | |
708 | seq_puts(seq, ",inode_cache"); | |
a9572a15 EP |
709 | return 0; |
710 | } | |
711 | ||
a061fc8d | 712 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 713 | { |
450ba0ea | 714 | struct btrfs_root *test_root = data; |
a061fc8d | 715 | struct btrfs_root *root = btrfs_sb(s); |
4b82d6e4 | 716 | |
619c8c76 IK |
717 | /* |
718 | * If this super block is going away, return false as it | |
719 | * can't match as an existing super block. | |
720 | */ | |
721 | if (!atomic_read(&s->s_active)) | |
722 | return 0; | |
450ba0ea | 723 | return root->fs_info->fs_devices == test_root->fs_info->fs_devices; |
4b82d6e4 Y |
724 | } |
725 | ||
450ba0ea JB |
726 | static int btrfs_set_super(struct super_block *s, void *data) |
727 | { | |
728 | s->s_fs_info = data; | |
729 | ||
730 | return set_anon_super(s, data); | |
4b82d6e4 Y |
731 | } |
732 | ||
450ba0ea | 733 | |
edf24abe CH |
734 | /* |
735 | * Find a superblock for the given device / mount point. | |
736 | * | |
737 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
738 | * for multiple device setup. Make sure to keep it in sync. | |
739 | */ | |
061dbc6b | 740 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
306e16ce | 741 | const char *device_name, void *data) |
4b82d6e4 Y |
742 | { |
743 | struct block_device *bdev = NULL; | |
744 | struct super_block *s; | |
745 | struct dentry *root; | |
8a4b83cc | 746 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea JB |
747 | struct btrfs_root *tree_root = NULL; |
748 | struct btrfs_fs_info *fs_info = NULL; | |
97288f2c | 749 | fmode_t mode = FMODE_READ; |
73f73415 JB |
750 | char *subvol_name = NULL; |
751 | u64 subvol_objectid = 0; | |
e15d0542 | 752 | u64 subvol_rootid = 0; |
4b82d6e4 Y |
753 | int error = 0; |
754 | ||
97288f2c CH |
755 | if (!(flags & MS_RDONLY)) |
756 | mode |= FMODE_WRITE; | |
757 | ||
758 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 | 759 | &subvol_name, &subvol_objectid, |
e15d0542 | 760 | &subvol_rootid, &fs_devices); |
edf24abe | 761 | if (error) |
061dbc6b | 762 | return ERR_PTR(error); |
edf24abe | 763 | |
306e16ce | 764 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
8a4b83cc | 765 | if (error) |
edf24abe | 766 | goto error_free_subvol_name; |
4b82d6e4 | 767 | |
97288f2c | 768 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
8a4b83cc | 769 | if (error) |
edf24abe | 770 | goto error_free_subvol_name; |
8a4b83cc | 771 | |
2b82032c YZ |
772 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
773 | error = -EACCES; | |
774 | goto error_close_devices; | |
775 | } | |
776 | ||
450ba0ea JB |
777 | /* |
778 | * Setup a dummy root and fs_info for test/set super. This is because | |
779 | * we don't actually fill this stuff out until open_ctree, but we need | |
780 | * it for searching for existing supers, so this lets us do that and | |
781 | * then open_ctree will properly initialize everything later. | |
782 | */ | |
783 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
784 | tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS); | |
785 | if (!fs_info || !tree_root) { | |
786 | error = -ENOMEM; | |
787 | goto error_close_devices; | |
788 | } | |
789 | fs_info->tree_root = tree_root; | |
790 | fs_info->fs_devices = fs_devices; | |
791 | tree_root->fs_info = fs_info; | |
792 | ||
dfe25020 | 793 | bdev = fs_devices->latest_bdev; |
450ba0ea | 794 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, tree_root); |
4b82d6e4 Y |
795 | if (IS_ERR(s)) |
796 | goto error_s; | |
797 | ||
798 | if (s->s_root) { | |
799 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
6f5bbff9 | 800 | deactivate_locked_super(s); |
4b82d6e4 | 801 | error = -EBUSY; |
c146afad | 802 | goto error_close_devices; |
4b82d6e4 Y |
803 | } |
804 | ||
2b82032c | 805 | btrfs_close_devices(fs_devices); |
bdc924bb IK |
806 | kfree(fs_info); |
807 | kfree(tree_root); | |
4b82d6e4 Y |
808 | } else { |
809 | char b[BDEVNAME_SIZE]; | |
810 | ||
9e1f1de0 | 811 | s->s_flags = flags | MS_NOSEC; |
4b82d6e4 | 812 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
8a4b83cc CM |
813 | error = btrfs_fill_super(s, fs_devices, data, |
814 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 815 | if (error) { |
6f5bbff9 | 816 | deactivate_locked_super(s); |
1f483660 | 817 | goto error_free_subvol_name; |
4b82d6e4 Y |
818 | } |
819 | ||
788f20eb | 820 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
4b82d6e4 Y |
821 | s->s_flags |= MS_ACTIVE; |
822 | } | |
823 | ||
73f73415 JB |
824 | /* if they gave us a subvolume name bind mount into that */ |
825 | if (strcmp(subvol_name, ".")) { | |
826 | struct dentry *new_root; | |
e15d0542 XZ |
827 | |
828 | root = get_default_root(s, subvol_rootid); | |
829 | if (IS_ERR(root)) { | |
830 | error = PTR_ERR(root); | |
831 | deactivate_locked_super(s); | |
832 | goto error_free_subvol_name; | |
833 | } | |
834 | ||
73f73415 JB |
835 | mutex_lock(&root->d_inode->i_mutex); |
836 | new_root = lookup_one_len(subvol_name, root, | |
d397712b | 837 | strlen(subvol_name)); |
73f73415 | 838 | mutex_unlock(&root->d_inode->i_mutex); |
d397712b | 839 | |
73f73415 | 840 | if (IS_ERR(new_root)) { |
f106e82c | 841 | dput(root); |
6f5bbff9 | 842 | deactivate_locked_super(s); |
73f73415 | 843 | error = PTR_ERR(new_root); |
0e78340f | 844 | goto error_free_subvol_name; |
76fcef19 | 845 | } |
73f73415 | 846 | if (!new_root->d_inode) { |
76fcef19 | 847 | dput(root); |
73f73415 | 848 | dput(new_root); |
6f5bbff9 | 849 | deactivate_locked_super(s); |
76fcef19 | 850 | error = -ENXIO; |
0e78340f | 851 | goto error_free_subvol_name; |
76fcef19 | 852 | } |
73f73415 JB |
853 | dput(root); |
854 | root = new_root; | |
e15d0542 XZ |
855 | } else { |
856 | root = get_default_root(s, subvol_objectid); | |
857 | if (IS_ERR(root)) { | |
858 | error = PTR_ERR(root); | |
859 | deactivate_locked_super(s); | |
860 | goto error_free_subvol_name; | |
861 | } | |
4b82d6e4 Y |
862 | } |
863 | ||
edf24abe | 864 | kfree(subvol_name); |
061dbc6b | 865 | return root; |
4b82d6e4 Y |
866 | |
867 | error_s: | |
868 | error = PTR_ERR(s); | |
c146afad | 869 | error_close_devices: |
8a4b83cc | 870 | btrfs_close_devices(fs_devices); |
450ba0ea JB |
871 | kfree(fs_info); |
872 | kfree(tree_root); | |
edf24abe CH |
873 | error_free_subvol_name: |
874 | kfree(subvol_name); | |
061dbc6b | 875 | return ERR_PTR(error); |
4b82d6e4 | 876 | } |
2e635a27 | 877 | |
c146afad YZ |
878 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
879 | { | |
880 | struct btrfs_root *root = btrfs_sb(sb); | |
881 | int ret; | |
882 | ||
b288052e CM |
883 | ret = btrfs_parse_options(root, data); |
884 | if (ret) | |
885 | return -EINVAL; | |
886 | ||
c146afad YZ |
887 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
888 | return 0; | |
889 | ||
890 | if (*flags & MS_RDONLY) { | |
891 | sb->s_flags |= MS_RDONLY; | |
892 | ||
893 | ret = btrfs_commit_super(root); | |
894 | WARN_ON(ret); | |
895 | } else { | |
2b82032c YZ |
896 | if (root->fs_info->fs_devices->rw_devices == 0) |
897 | return -EACCES; | |
898 | ||
c146afad YZ |
899 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) |
900 | return -EINVAL; | |
901 | ||
d68fc57b | 902 | ret = btrfs_cleanup_fs_roots(root->fs_info); |
c146afad YZ |
903 | WARN_ON(ret); |
904 | ||
d68fc57b YZ |
905 | /* recover relocation */ |
906 | ret = btrfs_recover_relocation(root); | |
c146afad YZ |
907 | WARN_ON(ret); |
908 | ||
909 | sb->s_flags &= ~MS_RDONLY; | |
910 | } | |
911 | ||
912 | return 0; | |
913 | } | |
914 | ||
bcd53741 AJ |
915 | /* Used to sort the devices by max_avail(descending sort) */ |
916 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, | |
917 | const void *dev_info2) | |
918 | { | |
919 | if (((struct btrfs_device_info *)dev_info1)->max_avail > | |
920 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
921 | return -1; | |
922 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
923 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
924 | return 1; | |
925 | else | |
926 | return 0; | |
927 | } | |
928 | ||
929 | /* | |
930 | * sort the devices by max_avail, in which max free extent size of each device | |
931 | * is stored.(Descending Sort) | |
932 | */ | |
933 | static inline void btrfs_descending_sort_devices( | |
934 | struct btrfs_device_info *devices, | |
935 | size_t nr_devices) | |
936 | { | |
937 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
938 | btrfs_cmp_device_free_bytes, NULL); | |
939 | } | |
940 | ||
6d07bcec MX |
941 | /* |
942 | * The helper to calc the free space on the devices that can be used to store | |
943 | * file data. | |
944 | */ | |
945 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) | |
946 | { | |
947 | struct btrfs_fs_info *fs_info = root->fs_info; | |
948 | struct btrfs_device_info *devices_info; | |
949 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
950 | struct btrfs_device *device; | |
951 | u64 skip_space; | |
952 | u64 type; | |
953 | u64 avail_space; | |
954 | u64 used_space; | |
955 | u64 min_stripe_size; | |
956 | int min_stripes = 1; | |
957 | int i = 0, nr_devices; | |
958 | int ret; | |
959 | ||
960 | nr_devices = fs_info->fs_devices->rw_devices; | |
961 | BUG_ON(!nr_devices); | |
962 | ||
963 | devices_info = kmalloc(sizeof(*devices_info) * nr_devices, | |
964 | GFP_NOFS); | |
965 | if (!devices_info) | |
966 | return -ENOMEM; | |
967 | ||
968 | /* calc min stripe number for data space alloction */ | |
969 | type = btrfs_get_alloc_profile(root, 1); | |
970 | if (type & BTRFS_BLOCK_GROUP_RAID0) | |
971 | min_stripes = 2; | |
972 | else if (type & BTRFS_BLOCK_GROUP_RAID1) | |
973 | min_stripes = 2; | |
974 | else if (type & BTRFS_BLOCK_GROUP_RAID10) | |
975 | min_stripes = 4; | |
976 | ||
977 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
978 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; | |
979 | else | |
980 | min_stripe_size = BTRFS_STRIPE_LEN; | |
981 | ||
982 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { | |
983 | if (!device->in_fs_metadata) | |
984 | continue; | |
985 | ||
986 | avail_space = device->total_bytes - device->bytes_used; | |
987 | ||
988 | /* align with stripe_len */ | |
989 | do_div(avail_space, BTRFS_STRIPE_LEN); | |
990 | avail_space *= BTRFS_STRIPE_LEN; | |
991 | ||
992 | /* | |
993 | * In order to avoid overwritting the superblock on the drive, | |
994 | * btrfs starts at an offset of at least 1MB when doing chunk | |
995 | * allocation. | |
996 | */ | |
997 | skip_space = 1024 * 1024; | |
998 | ||
999 | /* user can set the offset in fs_info->alloc_start. */ | |
1000 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= | |
1001 | device->total_bytes) | |
1002 | skip_space = max(fs_info->alloc_start, skip_space); | |
1003 | ||
1004 | /* | |
1005 | * btrfs can not use the free space in [0, skip_space - 1], | |
1006 | * we must subtract it from the total. In order to implement | |
1007 | * it, we account the used space in this range first. | |
1008 | */ | |
1009 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, | |
1010 | &used_space); | |
1011 | if (ret) { | |
1012 | kfree(devices_info); | |
1013 | return ret; | |
1014 | } | |
1015 | ||
1016 | /* calc the free space in [0, skip_space - 1] */ | |
1017 | skip_space -= used_space; | |
1018 | ||
1019 | /* | |
1020 | * we can use the free space in [0, skip_space - 1], subtract | |
1021 | * it from the total. | |
1022 | */ | |
1023 | if (avail_space && avail_space >= skip_space) | |
1024 | avail_space -= skip_space; | |
1025 | else | |
1026 | avail_space = 0; | |
1027 | ||
1028 | if (avail_space < min_stripe_size) | |
1029 | continue; | |
1030 | ||
1031 | devices_info[i].dev = device; | |
1032 | devices_info[i].max_avail = avail_space; | |
1033 | ||
1034 | i++; | |
1035 | } | |
1036 | ||
1037 | nr_devices = i; | |
1038 | ||
1039 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1040 | ||
1041 | i = nr_devices - 1; | |
1042 | avail_space = 0; | |
1043 | while (nr_devices >= min_stripes) { | |
1044 | if (devices_info[i].max_avail >= min_stripe_size) { | |
1045 | int j; | |
1046 | u64 alloc_size; | |
1047 | ||
1048 | avail_space += devices_info[i].max_avail * min_stripes; | |
1049 | alloc_size = devices_info[i].max_avail; | |
1050 | for (j = i + 1 - min_stripes; j <= i; j++) | |
1051 | devices_info[j].max_avail -= alloc_size; | |
1052 | } | |
1053 | i--; | |
1054 | nr_devices--; | |
1055 | } | |
1056 | ||
1057 | kfree(devices_info); | |
1058 | *free_bytes = avail_space; | |
1059 | return 0; | |
1060 | } | |
1061 | ||
8fd17795 CM |
1062 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1063 | { | |
1064 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 1065 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
bd4d1088 JB |
1066 | struct list_head *head = &root->fs_info->space_info; |
1067 | struct btrfs_space_info *found; | |
1068 | u64 total_used = 0; | |
6d07bcec | 1069 | u64 total_free_data = 0; |
db94535d | 1070 | int bits = dentry->d_sb->s_blocksize_bits; |
9d03632e | 1071 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
6d07bcec | 1072 | int ret; |
8fd17795 | 1073 | |
6d07bcec MX |
1074 | /* holding chunk_muext to avoid allocating new chunks */ |
1075 | mutex_lock(&root->fs_info->chunk_mutex); | |
bd4d1088 | 1076 | rcu_read_lock(); |
89a55897 | 1077 | list_for_each_entry_rcu(found, head, list) { |
6d07bcec MX |
1078 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
1079 | total_free_data += found->disk_total - found->disk_used; | |
1080 | total_free_data -= | |
1081 | btrfs_account_ro_block_groups_free_space(found); | |
1082 | } | |
1083 | ||
b742bb82 | 1084 | total_used += found->disk_used; |
89a55897 | 1085 | } |
bd4d1088 JB |
1086 | rcu_read_unlock(); |
1087 | ||
8fd17795 | 1088 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 1089 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 | 1090 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
8fd17795 CM |
1091 | buf->f_bsize = dentry->d_sb->s_blocksize; |
1092 | buf->f_type = BTRFS_SUPER_MAGIC; | |
6d07bcec MX |
1093 | buf->f_bavail = total_free_data; |
1094 | ret = btrfs_calc_avail_data_space(root, &total_free_data); | |
1095 | if (ret) { | |
1096 | mutex_unlock(&root->fs_info->chunk_mutex); | |
1097 | return ret; | |
1098 | } | |
1099 | buf->f_bavail += total_free_data; | |
1100 | buf->f_bavail = buf->f_bavail >> bits; | |
1101 | mutex_unlock(&root->fs_info->chunk_mutex); | |
d397712b | 1102 | |
9d03632e | 1103 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 1104 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
1105 | on a big-endian or little-endian host */ |
1106 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
1107 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
1108 | /* Mask in the root object ID too, to disambiguate subvols */ |
1109 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
1110 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
1111 | ||
8fd17795 CM |
1112 | return 0; |
1113 | } | |
b5133862 | 1114 | |
2e635a27 CM |
1115 | static struct file_system_type btrfs_fs_type = { |
1116 | .owner = THIS_MODULE, | |
1117 | .name = "btrfs", | |
061dbc6b | 1118 | .mount = btrfs_mount, |
a061fc8d | 1119 | .kill_sb = kill_anon_super, |
2e635a27 CM |
1120 | .fs_flags = FS_REQUIRES_DEV, |
1121 | }; | |
a9218f6b | 1122 | |
d352ac68 CM |
1123 | /* |
1124 | * used by btrfsctl to scan devices when no FS is mounted | |
1125 | */ | |
8a4b83cc CM |
1126 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
1127 | unsigned long arg) | |
1128 | { | |
1129 | struct btrfs_ioctl_vol_args *vol; | |
1130 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 1131 | int ret = -ENOTTY; |
8a4b83cc | 1132 | |
e441d54d CM |
1133 | if (!capable(CAP_SYS_ADMIN)) |
1134 | return -EPERM; | |
1135 | ||
dae7b665 LZ |
1136 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
1137 | if (IS_ERR(vol)) | |
1138 | return PTR_ERR(vol); | |
c071fcfd | 1139 | |
8a4b83cc CM |
1140 | switch (cmd) { |
1141 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 1142 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
1143 | &btrfs_fs_type, &fs_devices); |
1144 | break; | |
1145 | } | |
dae7b665 | 1146 | |
8a4b83cc | 1147 | kfree(vol); |
f819d837 | 1148 | return ret; |
8a4b83cc CM |
1149 | } |
1150 | ||
0176260f | 1151 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b Y |
1152 | { |
1153 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
1154 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
1155 | mutex_lock(&root->fs_info->cleaner_mutex); | |
0176260f | 1156 | return 0; |
ed0dab6b Y |
1157 | } |
1158 | ||
0176260f | 1159 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b Y |
1160 | { |
1161 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
1162 | mutex_unlock(&root->fs_info->cleaner_mutex); |
1163 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
0176260f | 1164 | return 0; |
ed0dab6b | 1165 | } |
2e635a27 | 1166 | |
b87221de | 1167 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 1168 | .drop_inode = btrfs_drop_inode, |
bd555975 | 1169 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 1170 | .put_super = btrfs_put_super, |
d5719762 | 1171 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 1172 | .show_options = btrfs_show_options, |
4730a4bc | 1173 | .write_inode = btrfs_write_inode, |
b5133862 | 1174 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
1175 | .alloc_inode = btrfs_alloc_inode, |
1176 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 1177 | .statfs = btrfs_statfs, |
c146afad | 1178 | .remount_fs = btrfs_remount, |
0176260f LT |
1179 | .freeze_fs = btrfs_freeze, |
1180 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 1181 | }; |
a9218f6b CM |
1182 | |
1183 | static const struct file_operations btrfs_ctl_fops = { | |
1184 | .unlocked_ioctl = btrfs_control_ioctl, | |
1185 | .compat_ioctl = btrfs_control_ioctl, | |
1186 | .owner = THIS_MODULE, | |
6038f373 | 1187 | .llseek = noop_llseek, |
a9218f6b CM |
1188 | }; |
1189 | ||
1190 | static struct miscdevice btrfs_misc = { | |
578454ff | 1191 | .minor = BTRFS_MINOR, |
a9218f6b CM |
1192 | .name = "btrfs-control", |
1193 | .fops = &btrfs_ctl_fops | |
1194 | }; | |
1195 | ||
578454ff KS |
1196 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
1197 | MODULE_ALIAS("devname:btrfs-control"); | |
1198 | ||
a9218f6b CM |
1199 | static int btrfs_interface_init(void) |
1200 | { | |
1201 | return misc_register(&btrfs_misc); | |
1202 | } | |
1203 | ||
b2950863 | 1204 | static void btrfs_interface_exit(void) |
a9218f6b CM |
1205 | { |
1206 | if (misc_deregister(&btrfs_misc) < 0) | |
d397712b | 1207 | printk(KERN_INFO "misc_deregister failed for control device"); |
a9218f6b CM |
1208 | } |
1209 | ||
2e635a27 CM |
1210 | static int __init init_btrfs_fs(void) |
1211 | { | |
2c90e5d6 | 1212 | int err; |
58176a96 JB |
1213 | |
1214 | err = btrfs_init_sysfs(); | |
1215 | if (err) | |
1216 | return err; | |
1217 | ||
261507a0 | 1218 | err = btrfs_init_compress(); |
2c90e5d6 | 1219 | if (err) |
a74a4b97 | 1220 | goto free_sysfs; |
d1310b2e | 1221 | |
261507a0 LZ |
1222 | err = btrfs_init_cachep(); |
1223 | if (err) | |
1224 | goto free_compress; | |
1225 | ||
d1310b2e | 1226 | err = extent_io_init(); |
2f4cbe64 WB |
1227 | if (err) |
1228 | goto free_cachep; | |
1229 | ||
d1310b2e CM |
1230 | err = extent_map_init(); |
1231 | if (err) | |
1232 | goto free_extent_io; | |
1233 | ||
16cdcec7 | 1234 | err = btrfs_delayed_inode_init(); |
2f4cbe64 WB |
1235 | if (err) |
1236 | goto free_extent_map; | |
c8b97818 | 1237 | |
16cdcec7 MX |
1238 | err = btrfs_interface_init(); |
1239 | if (err) | |
1240 | goto free_delayed_inode; | |
1241 | ||
a9218f6b CM |
1242 | err = register_filesystem(&btrfs_fs_type); |
1243 | if (err) | |
1244 | goto unregister_ioctl; | |
b3c3da71 CM |
1245 | |
1246 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); | |
2f4cbe64 WB |
1247 | return 0; |
1248 | ||
a9218f6b CM |
1249 | unregister_ioctl: |
1250 | btrfs_interface_exit(); | |
16cdcec7 MX |
1251 | free_delayed_inode: |
1252 | btrfs_delayed_inode_exit(); | |
2f4cbe64 WB |
1253 | free_extent_map: |
1254 | extent_map_exit(); | |
d1310b2e CM |
1255 | free_extent_io: |
1256 | extent_io_exit(); | |
2f4cbe64 WB |
1257 | free_cachep: |
1258 | btrfs_destroy_cachep(); | |
261507a0 LZ |
1259 | free_compress: |
1260 | btrfs_exit_compress(); | |
a74a4b97 | 1261 | free_sysfs: |
2f4cbe64 WB |
1262 | btrfs_exit_sysfs(); |
1263 | return err; | |
2e635a27 CM |
1264 | } |
1265 | ||
1266 | static void __exit exit_btrfs_fs(void) | |
1267 | { | |
39279cc3 | 1268 | btrfs_destroy_cachep(); |
16cdcec7 | 1269 | btrfs_delayed_inode_exit(); |
a52d9a80 | 1270 | extent_map_exit(); |
d1310b2e | 1271 | extent_io_exit(); |
a9218f6b | 1272 | btrfs_interface_exit(); |
2e635a27 | 1273 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 1274 | btrfs_exit_sysfs(); |
8a4b83cc | 1275 | btrfs_cleanup_fs_uuids(); |
261507a0 | 1276 | btrfs_exit_compress(); |
2e635a27 CM |
1277 | } |
1278 | ||
1279 | module_init(init_btrfs_fs) | |
1280 | module_exit(exit_btrfs_fs) | |
1281 | ||
1282 | MODULE_LICENSE("GPL"); |