Commit | Line | Data |
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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> |
4b4e25f2 | 41 | #include "compat.h" |
2e635a27 | 42 | #include "ctree.h" |
e20d96d6 | 43 | #include "disk-io.h" |
d5719762 | 44 | #include "transaction.h" |
2c90e5d6 | 45 | #include "btrfs_inode.h" |
c5739bba | 46 | #include "ioctl.h" |
3a686375 | 47 | #include "print-tree.h" |
5103e947 | 48 | #include "xattr.h" |
8a4b83cc | 49 | #include "volumes.h" |
b3c3da71 | 50 | #include "version.h" |
be6e8dc0 | 51 | #include "export.h" |
c8b97818 | 52 | #include "compression.h" |
2e635a27 | 53 | |
b87221de | 54 | static const struct super_operations btrfs_super_ops; |
75dfe396 | 55 | |
d397712b | 56 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 57 | { |
39279cc3 | 58 | struct btrfs_root *root = btrfs_sb(sb); |
b18c6685 | 59 | int ret; |
b18c6685 | 60 | |
39279cc3 | 61 | ret = close_ctree(root); |
39279cc3 | 62 | sb->s_fs_info = NULL; |
75dfe396 CM |
63 | } |
64 | ||
95e05289 | 65 | enum { |
43e570b0 | 66 | Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow, |
dfe25020 | 67 | Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, |
451d7585 | 68 | Opt_ssd, Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, |
a555f810 CM |
69 | Opt_compress, Opt_compress_force, Opt_notreelog, Opt_ratio, |
70 | Opt_flushoncommit, | |
e244a0ae | 71 | Opt_discard, Opt_err, |
95e05289 CM |
72 | }; |
73 | ||
74 | static match_table_t tokens = { | |
dfe25020 | 75 | {Opt_degraded, "degraded"}, |
95e05289 | 76 | {Opt_subvol, "subvol=%s"}, |
43e570b0 | 77 | {Opt_device, "device=%s"}, |
b6cda9bc | 78 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 79 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 80 | {Opt_nobarrier, "nobarrier"}, |
c59f8951 | 81 | {Opt_max_extent, "max_extent=%s"}, |
6f568d35 | 82 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 83 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 84 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 85 | {Opt_compress, "compress"}, |
a555f810 | 86 | {Opt_compress_force, "compress-force"}, |
e18e4809 | 87 | {Opt_ssd, "ssd"}, |
451d7585 | 88 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 89 | {Opt_nossd, "nossd"}, |
33268eaf | 90 | {Opt_noacl, "noacl"}, |
3a5e1404 | 91 | {Opt_notreelog, "notreelog"}, |
dccae999 | 92 | {Opt_flushoncommit, "flushoncommit"}, |
97e728d4 | 93 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 94 | {Opt_discard, "discard"}, |
33268eaf | 95 | {Opt_err, NULL}, |
95e05289 CM |
96 | }; |
97 | ||
edbd8d4e | 98 | u64 btrfs_parse_size(char *str) |
c59f8951 | 99 | { |
edbd8d4e | 100 | u64 res; |
c59f8951 CM |
101 | int mult = 1; |
102 | char *end; | |
103 | char last; | |
104 | ||
105 | res = simple_strtoul(str, &end, 10); | |
106 | ||
107 | last = end[0]; | |
108 | if (isalpha(last)) { | |
109 | last = tolower(last); | |
110 | switch (last) { | |
111 | case 'g': | |
112 | mult *= 1024; | |
113 | case 'm': | |
114 | mult *= 1024; | |
115 | case 'k': | |
116 | mult *= 1024; | |
117 | } | |
118 | res = res * mult; | |
119 | } | |
120 | return res; | |
121 | } | |
122 | ||
edf24abe CH |
123 | /* |
124 | * Regular mount options parser. Everything that is needed only when | |
125 | * reading in a new superblock is parsed here. | |
126 | */ | |
127 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 128 | { |
edf24abe | 129 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 130 | substring_t args[MAX_OPT_ARGS]; |
edf24abe | 131 | char *p, *num; |
4543df7e | 132 | int intarg; |
a7a3f7ca | 133 | int ret = 0; |
b6cda9bc | 134 | |
95e05289 | 135 | if (!options) |
edf24abe | 136 | return 0; |
95e05289 | 137 | |
be20aa9d CM |
138 | /* |
139 | * strsep changes the string, duplicate it because parse_options | |
140 | * gets called twice | |
141 | */ | |
142 | options = kstrdup(options, GFP_NOFS); | |
143 | if (!options) | |
144 | return -ENOMEM; | |
145 | ||
be20aa9d | 146 | |
edf24abe | 147 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
148 | int token; |
149 | if (!*p) | |
150 | continue; | |
151 | ||
152 | token = match_token(p, tokens, args); | |
153 | switch (token) { | |
dfe25020 | 154 | case Opt_degraded: |
edf24abe CH |
155 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
156 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 157 | break; |
95e05289 | 158 | case Opt_subvol: |
43e570b0 | 159 | case Opt_device: |
edf24abe | 160 | /* |
43e570b0 | 161 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
162 | * and can be happily ignored here. |
163 | */ | |
b6cda9bc CM |
164 | break; |
165 | case Opt_nodatasum: | |
067c28ad | 166 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
edf24abe | 167 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
168 | break; |
169 | case Opt_nodatacow: | |
edf24abe CH |
170 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
171 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
172 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 173 | break; |
c8b97818 CM |
174 | case Opt_compress: |
175 | printk(KERN_INFO "btrfs: use compression\n"); | |
176 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
177 | break; | |
a555f810 CM |
178 | case Opt_compress_force: |
179 | printk(KERN_INFO "btrfs: forcing compression\n"); | |
180 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
181 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
182 | break; | |
e18e4809 | 183 | case Opt_ssd: |
edf24abe CH |
184 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
185 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 186 | break; |
451d7585 CM |
187 | case Opt_ssd_spread: |
188 | printk(KERN_INFO "btrfs: use spread ssd " | |
189 | "allocation scheme\n"); | |
190 | btrfs_set_opt(info->mount_opt, SSD); | |
191 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
192 | break; | |
3b30c22f | 193 | case Opt_nossd: |
451d7585 CM |
194 | printk(KERN_INFO "btrfs: not using ssd allocation " |
195 | "scheme\n"); | |
c289811c | 196 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 197 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 198 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 199 | break; |
21ad10cf | 200 | case Opt_nobarrier: |
edf24abe CH |
201 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
202 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 203 | break; |
4543df7e CM |
204 | case Opt_thread_pool: |
205 | intarg = 0; | |
206 | match_int(&args[0], &intarg); | |
207 | if (intarg) { | |
208 | info->thread_pool_size = intarg; | |
209 | printk(KERN_INFO "btrfs: thread pool %d\n", | |
210 | info->thread_pool_size); | |
211 | } | |
212 | break; | |
c59f8951 | 213 | case Opt_max_extent: |
edf24abe CH |
214 | num = match_strdup(&args[0]); |
215 | if (num) { | |
216 | info->max_extent = btrfs_parse_size(num); | |
217 | kfree(num); | |
218 | ||
219 | info->max_extent = max_t(u64, | |
220 | info->max_extent, root->sectorsize); | |
221 | printk(KERN_INFO "btrfs: max_extent at %llu\n", | |
21380931 | 222 | (unsigned long long)info->max_extent); |
c59f8951 CM |
223 | } |
224 | break; | |
6f568d35 | 225 | case Opt_max_inline: |
edf24abe CH |
226 | num = match_strdup(&args[0]); |
227 | if (num) { | |
228 | info->max_inline = btrfs_parse_size(num); | |
229 | kfree(num); | |
230 | ||
15ada040 CM |
231 | if (info->max_inline) { |
232 | info->max_inline = max_t(u64, | |
233 | info->max_inline, | |
234 | root->sectorsize); | |
235 | } | |
edf24abe | 236 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
21380931 | 237 | (unsigned long long)info->max_inline); |
6f568d35 CM |
238 | } |
239 | break; | |
8f662a76 | 240 | case Opt_alloc_start: |
edf24abe CH |
241 | num = match_strdup(&args[0]); |
242 | if (num) { | |
243 | info->alloc_start = btrfs_parse_size(num); | |
244 | kfree(num); | |
245 | printk(KERN_INFO | |
246 | "btrfs: allocations start at %llu\n", | |
21380931 | 247 | (unsigned long long)info->alloc_start); |
8f662a76 CM |
248 | } |
249 | break; | |
33268eaf JB |
250 | case Opt_noacl: |
251 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
252 | break; | |
3a5e1404 SW |
253 | case Opt_notreelog: |
254 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
255 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
256 | break; | |
dccae999 SW |
257 | case Opt_flushoncommit: |
258 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
259 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
260 | break; | |
97e728d4 JB |
261 | case Opt_ratio: |
262 | intarg = 0; | |
263 | match_int(&args[0], &intarg); | |
264 | if (intarg) { | |
265 | info->metadata_ratio = intarg; | |
266 | printk(KERN_INFO "btrfs: metadata ratio %d\n", | |
267 | info->metadata_ratio); | |
268 | } | |
269 | break; | |
e244a0ae CH |
270 | case Opt_discard: |
271 | btrfs_set_opt(info->mount_opt, DISCARD); | |
272 | break; | |
a7a3f7ca SW |
273 | case Opt_err: |
274 | printk(KERN_INFO "btrfs: unrecognized mount option " | |
275 | "'%s'\n", p); | |
276 | ret = -EINVAL; | |
277 | goto out; | |
95e05289 | 278 | default: |
be20aa9d | 279 | break; |
95e05289 CM |
280 | } |
281 | } | |
a7a3f7ca | 282 | out: |
be20aa9d | 283 | kfree(options); |
a7a3f7ca | 284 | return ret; |
edf24abe CH |
285 | } |
286 | ||
287 | /* | |
288 | * Parse mount options that are required early in the mount process. | |
289 | * | |
290 | * All other options will be parsed on much later in the mount process and | |
291 | * only when we need to allocate a new super block. | |
292 | */ | |
97288f2c | 293 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
43e570b0 CH |
294 | void *holder, char **subvol_name, |
295 | struct btrfs_fs_devices **fs_devices) | |
edf24abe CH |
296 | { |
297 | substring_t args[MAX_OPT_ARGS]; | |
298 | char *opts, *p; | |
299 | int error = 0; | |
300 | ||
301 | if (!options) | |
302 | goto out; | |
303 | ||
304 | /* | |
305 | * strsep changes the string, duplicate it because parse_options | |
306 | * gets called twice | |
307 | */ | |
308 | opts = kstrdup(options, GFP_KERNEL); | |
309 | if (!opts) | |
310 | return -ENOMEM; | |
311 | ||
312 | while ((p = strsep(&opts, ",")) != NULL) { | |
313 | int token; | |
314 | if (!*p) | |
315 | continue; | |
316 | ||
317 | token = match_token(p, tokens, args); | |
318 | switch (token) { | |
319 | case Opt_subvol: | |
320 | *subvol_name = match_strdup(&args[0]); | |
321 | break; | |
43e570b0 CH |
322 | case Opt_device: |
323 | error = btrfs_scan_one_device(match_strdup(&args[0]), | |
324 | flags, holder, fs_devices); | |
325 | if (error) | |
326 | goto out_free_opts; | |
327 | break; | |
edf24abe CH |
328 | default: |
329 | break; | |
330 | } | |
331 | } | |
332 | ||
43e570b0 | 333 | out_free_opts: |
edf24abe CH |
334 | kfree(opts); |
335 | out: | |
336 | /* | |
337 | * If no subvolume name is specified we use the default one. Allocate | |
3de4586c | 338 | * a copy of the string "." here so that code later in the |
edf24abe CH |
339 | * mount path doesn't care if it's the default volume or another one. |
340 | */ | |
341 | if (!*subvol_name) { | |
3de4586c | 342 | *subvol_name = kstrdup(".", GFP_KERNEL); |
edf24abe CH |
343 | if (!*subvol_name) |
344 | return -ENOMEM; | |
345 | } | |
346 | return error; | |
95e05289 CM |
347 | } |
348 | ||
d397712b | 349 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 350 | struct btrfs_fs_devices *fs_devices, |
d397712b | 351 | void *data, int silent) |
75dfe396 | 352 | { |
d397712b CM |
353 | struct inode *inode; |
354 | struct dentry *root_dentry; | |
39279cc3 CM |
355 | struct btrfs_super_block *disk_super; |
356 | struct btrfs_root *tree_root; | |
5d4f98a2 | 357 | struct btrfs_key key; |
39279cc3 | 358 | int err; |
a429e513 | 359 | |
39279cc3 CM |
360 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
361 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
362 | sb->s_op = &btrfs_super_ops; | |
be6e8dc0 | 363 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 364 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 365 | sb->s_time_gran = 1; |
0eda294d | 366 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 367 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 368 | #endif |
a429e513 | 369 | |
dfe25020 | 370 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
6567e837 | 371 | |
e58ca020 | 372 | if (IS_ERR(tree_root)) { |
39279cc3 | 373 | printk("btrfs: open_ctree failed\n"); |
e58ca020 | 374 | return PTR_ERR(tree_root); |
a429e513 | 375 | } |
39279cc3 | 376 | sb->s_fs_info = tree_root; |
5f39d397 | 377 | disk_super = &tree_root->fs_info->super_copy; |
a429e513 | 378 | |
5d4f98a2 YZ |
379 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
380 | key.type = BTRFS_INODE_ITEM_KEY; | |
381 | key.offset = 0; | |
382 | inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root); | |
383 | if (IS_ERR(inode)) { | |
384 | err = PTR_ERR(inode); | |
39279cc3 | 385 | goto fail_close; |
f254e52c | 386 | } |
f254e52c | 387 | |
39279cc3 CM |
388 | root_dentry = d_alloc_root(inode); |
389 | if (!root_dentry) { | |
390 | iput(inode); | |
391 | err = -ENOMEM; | |
392 | goto fail_close; | |
f254e52c | 393 | } |
e4404d6e | 394 | #if 0 |
58176a96 JB |
395 | /* this does the super kobj at the same time */ |
396 | err = btrfs_sysfs_add_super(tree_root->fs_info); | |
397 | if (err) | |
398 | goto fail_close; | |
e4404d6e | 399 | #endif |
58176a96 | 400 | |
39279cc3 | 401 | sb->s_root = root_dentry; |
6885f308 | 402 | |
6885f308 | 403 | save_mount_options(sb, data); |
2619ba1f | 404 | return 0; |
39279cc3 CM |
405 | |
406 | fail_close: | |
407 | close_ctree(tree_root); | |
408 | return err; | |
2619ba1f CM |
409 | } |
410 | ||
6bf13c0c | 411 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
412 | { |
413 | struct btrfs_trans_handle *trans; | |
dccae999 | 414 | struct btrfs_root *root = btrfs_sb(sb); |
c5739bba | 415 | int ret; |
2619ba1f | 416 | |
39279cc3 CM |
417 | if (!wait) { |
418 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
419 | return 0; | |
420 | } | |
771ed689 | 421 | |
24bbcf04 YZ |
422 | btrfs_start_delalloc_inodes(root, 0); |
423 | btrfs_wait_ordered_extents(root, 0, 0); | |
771ed689 | 424 | |
c5739bba | 425 | trans = btrfs_start_transaction(root, 1); |
c5739bba | 426 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d | 427 | return ret; |
2c90e5d6 CM |
428 | } |
429 | ||
a9572a15 EP |
430 | static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
431 | { | |
432 | struct btrfs_root *root = btrfs_sb(vfs->mnt_sb); | |
433 | struct btrfs_fs_info *info = root->fs_info; | |
434 | ||
435 | if (btrfs_test_opt(root, DEGRADED)) | |
436 | seq_puts(seq, ",degraded"); | |
437 | if (btrfs_test_opt(root, NODATASUM)) | |
438 | seq_puts(seq, ",nodatasum"); | |
439 | if (btrfs_test_opt(root, NODATACOW)) | |
440 | seq_puts(seq, ",nodatacow"); | |
441 | if (btrfs_test_opt(root, NOBARRIER)) | |
442 | seq_puts(seq, ",nobarrier"); | |
443 | if (info->max_extent != (u64)-1) | |
21380931 JB |
444 | seq_printf(seq, ",max_extent=%llu", |
445 | (unsigned long long)info->max_extent); | |
a9572a15 | 446 | if (info->max_inline != 8192 * 1024) |
21380931 JB |
447 | seq_printf(seq, ",max_inline=%llu", |
448 | (unsigned long long)info->max_inline); | |
a9572a15 | 449 | if (info->alloc_start != 0) |
21380931 JB |
450 | seq_printf(seq, ",alloc_start=%llu", |
451 | (unsigned long long)info->alloc_start); | |
a9572a15 EP |
452 | if (info->thread_pool_size != min_t(unsigned long, |
453 | num_online_cpus() + 2, 8)) | |
454 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
455 | if (btrfs_test_opt(root, COMPRESS)) | |
456 | seq_puts(seq, ",compress"); | |
c289811c CM |
457 | if (btrfs_test_opt(root, NOSSD)) |
458 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
459 | if (btrfs_test_opt(root, SSD_SPREAD)) |
460 | seq_puts(seq, ",ssd_spread"); | |
461 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 462 | seq_puts(seq, ",ssd"); |
3a5e1404 | 463 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 464 | seq_puts(seq, ",notreelog"); |
dccae999 | 465 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 466 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
467 | if (btrfs_test_opt(root, DISCARD)) |
468 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
469 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
470 | seq_puts(seq, ",noacl"); | |
471 | return 0; | |
472 | } | |
473 | ||
a061fc8d | 474 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 475 | { |
a061fc8d CM |
476 | struct btrfs_fs_devices *test_fs_devices = data; |
477 | struct btrfs_root *root = btrfs_sb(s); | |
4b82d6e4 | 478 | |
a061fc8d | 479 | return root->fs_info->fs_devices == test_fs_devices; |
4b82d6e4 Y |
480 | } |
481 | ||
edf24abe CH |
482 | /* |
483 | * Find a superblock for the given device / mount point. | |
484 | * | |
485 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
486 | * for multiple device setup. Make sure to keep it in sync. | |
487 | */ | |
488 | static int btrfs_get_sb(struct file_system_type *fs_type, int flags, | |
489 | const char *dev_name, void *data, struct vfsmount *mnt) | |
4b82d6e4 | 490 | { |
edf24abe | 491 | char *subvol_name = NULL; |
4b82d6e4 Y |
492 | struct block_device *bdev = NULL; |
493 | struct super_block *s; | |
494 | struct dentry *root; | |
8a4b83cc | 495 | struct btrfs_fs_devices *fs_devices = NULL; |
97288f2c | 496 | fmode_t mode = FMODE_READ; |
4b82d6e4 Y |
497 | int error = 0; |
498 | ||
97288f2c CH |
499 | if (!(flags & MS_RDONLY)) |
500 | mode |= FMODE_WRITE; | |
501 | ||
502 | error = btrfs_parse_early_options(data, mode, fs_type, | |
43e570b0 | 503 | &subvol_name, &fs_devices); |
edf24abe | 504 | if (error) |
1f483660 | 505 | return error; |
edf24abe | 506 | |
97288f2c | 507 | error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices); |
8a4b83cc | 508 | if (error) |
edf24abe | 509 | goto error_free_subvol_name; |
4b82d6e4 | 510 | |
97288f2c | 511 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
8a4b83cc | 512 | if (error) |
edf24abe | 513 | goto error_free_subvol_name; |
8a4b83cc | 514 | |
2b82032c YZ |
515 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
516 | error = -EACCES; | |
517 | goto error_close_devices; | |
518 | } | |
519 | ||
dfe25020 | 520 | bdev = fs_devices->latest_bdev; |
a061fc8d | 521 | s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); |
4b82d6e4 Y |
522 | if (IS_ERR(s)) |
523 | goto error_s; | |
524 | ||
525 | if (s->s_root) { | |
526 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
6f5bbff9 | 527 | deactivate_locked_super(s); |
4b82d6e4 | 528 | error = -EBUSY; |
c146afad | 529 | goto error_close_devices; |
4b82d6e4 Y |
530 | } |
531 | ||
2b82032c | 532 | btrfs_close_devices(fs_devices); |
4b82d6e4 Y |
533 | } else { |
534 | char b[BDEVNAME_SIZE]; | |
535 | ||
536 | s->s_flags = flags; | |
537 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); | |
8a4b83cc CM |
538 | error = btrfs_fill_super(s, fs_devices, data, |
539 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 540 | if (error) { |
6f5bbff9 | 541 | deactivate_locked_super(s); |
1f483660 | 542 | goto error_free_subvol_name; |
4b82d6e4 Y |
543 | } |
544 | ||
788f20eb | 545 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
4b82d6e4 Y |
546 | s->s_flags |= MS_ACTIVE; |
547 | } | |
548 | ||
76fcef19 DW |
549 | if (!strcmp(subvol_name, ".")) |
550 | root = dget(s->s_root); | |
551 | else { | |
552 | mutex_lock(&s->s_root->d_inode->i_mutex); | |
d397712b CM |
553 | root = lookup_one_len(subvol_name, s->s_root, |
554 | strlen(subvol_name)); | |
76fcef19 | 555 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
d397712b | 556 | |
76fcef19 | 557 | if (IS_ERR(root)) { |
6f5bbff9 | 558 | deactivate_locked_super(s); |
76fcef19 | 559 | error = PTR_ERR(root); |
1f483660 | 560 | goto error_free_subvol_name; |
76fcef19 DW |
561 | } |
562 | if (!root->d_inode) { | |
563 | dput(root); | |
6f5bbff9 | 564 | deactivate_locked_super(s); |
76fcef19 | 565 | error = -ENXIO; |
1f483660 | 566 | goto error_free_subvol_name; |
76fcef19 | 567 | } |
4b82d6e4 Y |
568 | } |
569 | ||
570 | mnt->mnt_sb = s; | |
571 | mnt->mnt_root = root; | |
edf24abe CH |
572 | |
573 | kfree(subvol_name); | |
4b82d6e4 Y |
574 | return 0; |
575 | ||
576 | error_s: | |
577 | error = PTR_ERR(s); | |
c146afad | 578 | error_close_devices: |
8a4b83cc | 579 | btrfs_close_devices(fs_devices); |
edf24abe CH |
580 | error_free_subvol_name: |
581 | kfree(subvol_name); | |
4b82d6e4 Y |
582 | return error; |
583 | } | |
2e635a27 | 584 | |
c146afad YZ |
585 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
586 | { | |
587 | struct btrfs_root *root = btrfs_sb(sb); | |
588 | int ret; | |
589 | ||
b288052e CM |
590 | ret = btrfs_parse_options(root, data); |
591 | if (ret) | |
592 | return -EINVAL; | |
593 | ||
c146afad YZ |
594 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
595 | return 0; | |
596 | ||
597 | if (*flags & MS_RDONLY) { | |
598 | sb->s_flags |= MS_RDONLY; | |
599 | ||
600 | ret = btrfs_commit_super(root); | |
601 | WARN_ON(ret); | |
602 | } else { | |
2b82032c YZ |
603 | if (root->fs_info->fs_devices->rw_devices == 0) |
604 | return -EACCES; | |
605 | ||
c146afad YZ |
606 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) |
607 | return -EINVAL; | |
608 | ||
5d4f98a2 YZ |
609 | /* recover relocation */ |
610 | ret = btrfs_recover_relocation(root); | |
c146afad YZ |
611 | WARN_ON(ret); |
612 | ||
613 | ret = btrfs_cleanup_fs_roots(root->fs_info); | |
614 | WARN_ON(ret); | |
615 | ||
616 | sb->s_flags &= ~MS_RDONLY; | |
617 | } | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
8fd17795 CM |
622 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
623 | { | |
624 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 625 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
db94535d | 626 | int bits = dentry->d_sb->s_blocksize_bits; |
9d03632e | 627 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
8fd17795 CM |
628 | |
629 | buf->f_namelen = BTRFS_NAME_LEN; | |
db94535d CM |
630 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
631 | buf->f_bfree = buf->f_blocks - | |
632 | (btrfs_super_bytes_used(disk_super) >> bits); | |
8fd17795 CM |
633 | buf->f_bavail = buf->f_bfree; |
634 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
635 | buf->f_type = BTRFS_SUPER_MAGIC; | |
d397712b | 636 | |
9d03632e | 637 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 638 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
639 | on a big-endian or little-endian host */ |
640 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
641 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
642 | /* Mask in the root object ID too, to disambiguate subvols */ |
643 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
644 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
645 | ||
8fd17795 CM |
646 | return 0; |
647 | } | |
b5133862 | 648 | |
2e635a27 CM |
649 | static struct file_system_type btrfs_fs_type = { |
650 | .owner = THIS_MODULE, | |
651 | .name = "btrfs", | |
652 | .get_sb = btrfs_get_sb, | |
a061fc8d | 653 | .kill_sb = kill_anon_super, |
2e635a27 CM |
654 | .fs_flags = FS_REQUIRES_DEV, |
655 | }; | |
a9218f6b | 656 | |
d352ac68 CM |
657 | /* |
658 | * used by btrfsctl to scan devices when no FS is mounted | |
659 | */ | |
8a4b83cc CM |
660 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
661 | unsigned long arg) | |
662 | { | |
663 | struct btrfs_ioctl_vol_args *vol; | |
664 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 665 | int ret = -ENOTTY; |
8a4b83cc | 666 | |
e441d54d CM |
667 | if (!capable(CAP_SYS_ADMIN)) |
668 | return -EPERM; | |
669 | ||
dae7b665 LZ |
670 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
671 | if (IS_ERR(vol)) | |
672 | return PTR_ERR(vol); | |
c071fcfd | 673 | |
8a4b83cc CM |
674 | switch (cmd) { |
675 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 676 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
677 | &btrfs_fs_type, &fs_devices); |
678 | break; | |
679 | } | |
dae7b665 | 680 | |
8a4b83cc | 681 | kfree(vol); |
f819d837 | 682 | return ret; |
8a4b83cc CM |
683 | } |
684 | ||
0176260f | 685 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b Y |
686 | { |
687 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
688 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
689 | mutex_lock(&root->fs_info->cleaner_mutex); | |
0176260f | 690 | return 0; |
ed0dab6b Y |
691 | } |
692 | ||
0176260f | 693 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b Y |
694 | { |
695 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
696 | mutex_unlock(&root->fs_info->cleaner_mutex); |
697 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
0176260f | 698 | return 0; |
ed0dab6b | 699 | } |
2e635a27 | 700 | |
b87221de | 701 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 702 | .drop_inode = btrfs_drop_inode, |
134e9731 | 703 | .delete_inode = btrfs_delete_inode, |
e20d96d6 | 704 | .put_super = btrfs_put_super, |
d5719762 | 705 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 706 | .show_options = btrfs_show_options, |
4730a4bc | 707 | .write_inode = btrfs_write_inode, |
b5133862 | 708 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
709 | .alloc_inode = btrfs_alloc_inode, |
710 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 711 | .statfs = btrfs_statfs, |
c146afad | 712 | .remount_fs = btrfs_remount, |
0176260f LT |
713 | .freeze_fs = btrfs_freeze, |
714 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 715 | }; |
a9218f6b CM |
716 | |
717 | static const struct file_operations btrfs_ctl_fops = { | |
718 | .unlocked_ioctl = btrfs_control_ioctl, | |
719 | .compat_ioctl = btrfs_control_ioctl, | |
720 | .owner = THIS_MODULE, | |
721 | }; | |
722 | ||
723 | static struct miscdevice btrfs_misc = { | |
724 | .minor = MISC_DYNAMIC_MINOR, | |
725 | .name = "btrfs-control", | |
726 | .fops = &btrfs_ctl_fops | |
727 | }; | |
728 | ||
729 | static int btrfs_interface_init(void) | |
730 | { | |
731 | return misc_register(&btrfs_misc); | |
732 | } | |
733 | ||
b2950863 | 734 | static void btrfs_interface_exit(void) |
a9218f6b CM |
735 | { |
736 | if (misc_deregister(&btrfs_misc) < 0) | |
d397712b | 737 | printk(KERN_INFO "misc_deregister failed for control device"); |
a9218f6b CM |
738 | } |
739 | ||
2e635a27 CM |
740 | static int __init init_btrfs_fs(void) |
741 | { | |
2c90e5d6 | 742 | int err; |
58176a96 JB |
743 | |
744 | err = btrfs_init_sysfs(); | |
745 | if (err) | |
746 | return err; | |
747 | ||
39279cc3 | 748 | err = btrfs_init_cachep(); |
2c90e5d6 | 749 | if (err) |
a74a4b97 | 750 | goto free_sysfs; |
d1310b2e CM |
751 | |
752 | err = extent_io_init(); | |
2f4cbe64 WB |
753 | if (err) |
754 | goto free_cachep; | |
755 | ||
d1310b2e CM |
756 | err = extent_map_init(); |
757 | if (err) | |
758 | goto free_extent_io; | |
759 | ||
a9218f6b | 760 | err = btrfs_interface_init(); |
2f4cbe64 WB |
761 | if (err) |
762 | goto free_extent_map; | |
c8b97818 | 763 | |
a9218f6b CM |
764 | err = register_filesystem(&btrfs_fs_type); |
765 | if (err) | |
766 | goto unregister_ioctl; | |
b3c3da71 CM |
767 | |
768 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); | |
2f4cbe64 WB |
769 | return 0; |
770 | ||
a9218f6b CM |
771 | unregister_ioctl: |
772 | btrfs_interface_exit(); | |
2f4cbe64 WB |
773 | free_extent_map: |
774 | extent_map_exit(); | |
d1310b2e CM |
775 | free_extent_io: |
776 | extent_io_exit(); | |
2f4cbe64 WB |
777 | free_cachep: |
778 | btrfs_destroy_cachep(); | |
a74a4b97 | 779 | free_sysfs: |
2f4cbe64 WB |
780 | btrfs_exit_sysfs(); |
781 | return err; | |
2e635a27 CM |
782 | } |
783 | ||
784 | static void __exit exit_btrfs_fs(void) | |
785 | { | |
39279cc3 | 786 | btrfs_destroy_cachep(); |
a52d9a80 | 787 | extent_map_exit(); |
d1310b2e | 788 | extent_io_exit(); |
a9218f6b | 789 | btrfs_interface_exit(); |
2e635a27 | 790 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 791 | btrfs_exit_sysfs(); |
8a4b83cc | 792 | btrfs_cleanup_fs_uuids(); |
c8b97818 | 793 | btrfs_zlib_exit(); |
2e635a27 CM |
794 | } |
795 | ||
796 | module_init(init_btrfs_fs) | |
797 | module_exit(exit_btrfs_fs) | |
798 | ||
799 | MODULE_LICENSE("GPL"); |