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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 CM |
28 | #include <linux/string.h> |
29 | #include <linux/smp_lock.h> | |
30 | #include <linux/backing-dev.h> | |
4b82d6e4 | 31 | #include <linux/mount.h> |
dee26a9f | 32 | #include <linux/mpage.h> |
75dfe396 CM |
33 | #include <linux/swap.h> |
34 | #include <linux/writeback.h> | |
8fd17795 | 35 | #include <linux/statfs.h> |
08607c1b | 36 | #include <linux/compat.h> |
95e05289 | 37 | #include <linux/parser.h> |
c59f8951 | 38 | #include <linux/ctype.h> |
6da6abae | 39 | #include <linux/namei.h> |
a9218f6b | 40 | #include <linux/miscdevice.h> |
1bcbf313 | 41 | #include <linux/magic.h> |
4b4e25f2 | 42 | #include "compat.h" |
2e635a27 | 43 | #include "ctree.h" |
e20d96d6 | 44 | #include "disk-io.h" |
d5719762 | 45 | #include "transaction.h" |
2c90e5d6 | 46 | #include "btrfs_inode.h" |
c5739bba | 47 | #include "ioctl.h" |
3a686375 | 48 | #include "print-tree.h" |
5103e947 | 49 | #include "xattr.h" |
8a4b83cc | 50 | #include "volumes.h" |
b3c3da71 | 51 | #include "version.h" |
be6e8dc0 | 52 | #include "export.h" |
c8b97818 | 53 | #include "compression.h" |
2e635a27 | 54 | |
f254e52c | 55 | |
39279cc3 | 56 | static struct super_operations btrfs_super_ops; |
75dfe396 | 57 | |
d397712b | 58 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 59 | { |
39279cc3 | 60 | struct btrfs_root *root = btrfs_sb(sb); |
b18c6685 | 61 | int ret; |
b18c6685 | 62 | |
39279cc3 | 63 | ret = close_ctree(root); |
39279cc3 | 64 | sb->s_fs_info = NULL; |
75dfe396 CM |
65 | } |
66 | ||
95e05289 | 67 | enum { |
43e570b0 | 68 | Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow, |
dfe25020 | 69 | Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, |
3a5e1404 | 70 | Opt_ssd, Opt_thread_pool, Opt_noacl, Opt_compress, Opt_notreelog, |
dccae999 | 71 | Opt_flushoncommit, 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"}, |
e18e4809 | 86 | {Opt_ssd, "ssd"}, |
33268eaf | 87 | {Opt_noacl, "noacl"}, |
3a5e1404 | 88 | {Opt_notreelog, "notreelog"}, |
dccae999 | 89 | {Opt_flushoncommit, "flushoncommit"}, |
33268eaf | 90 | {Opt_err, NULL}, |
95e05289 CM |
91 | }; |
92 | ||
edbd8d4e | 93 | u64 btrfs_parse_size(char *str) |
c59f8951 | 94 | { |
edbd8d4e | 95 | u64 res; |
c59f8951 CM |
96 | int mult = 1; |
97 | char *end; | |
98 | char last; | |
99 | ||
100 | res = simple_strtoul(str, &end, 10); | |
101 | ||
102 | last = end[0]; | |
103 | if (isalpha(last)) { | |
104 | last = tolower(last); | |
105 | switch (last) { | |
106 | case 'g': | |
107 | mult *= 1024; | |
108 | case 'm': | |
109 | mult *= 1024; | |
110 | case 'k': | |
111 | mult *= 1024; | |
112 | } | |
113 | res = res * mult; | |
114 | } | |
115 | return res; | |
116 | } | |
117 | ||
edf24abe CH |
118 | /* |
119 | * Regular mount options parser. Everything that is needed only when | |
120 | * reading in a new superblock is parsed here. | |
121 | */ | |
122 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 123 | { |
edf24abe | 124 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 125 | substring_t args[MAX_OPT_ARGS]; |
edf24abe | 126 | char *p, *num; |
4543df7e | 127 | int intarg; |
b6cda9bc | 128 | |
95e05289 | 129 | if (!options) |
edf24abe | 130 | return 0; |
95e05289 | 131 | |
be20aa9d CM |
132 | /* |
133 | * strsep changes the string, duplicate it because parse_options | |
134 | * gets called twice | |
135 | */ | |
136 | options = kstrdup(options, GFP_NOFS); | |
137 | if (!options) | |
138 | return -ENOMEM; | |
139 | ||
be20aa9d | 140 | |
edf24abe | 141 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
142 | int token; |
143 | if (!*p) | |
144 | continue; | |
145 | ||
146 | token = match_token(p, tokens, args); | |
147 | switch (token) { | |
dfe25020 | 148 | case Opt_degraded: |
edf24abe CH |
149 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
150 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 151 | break; |
95e05289 | 152 | case Opt_subvol: |
43e570b0 | 153 | case Opt_device: |
edf24abe | 154 | /* |
43e570b0 | 155 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
156 | * and can be happily ignored here. |
157 | */ | |
b6cda9bc CM |
158 | break; |
159 | case Opt_nodatasum: | |
edf24abe CH |
160 | printk(KERN_INFO "btrfs: setting nodatacsum\n"); |
161 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
be20aa9d CM |
162 | break; |
163 | case Opt_nodatacow: | |
edf24abe CH |
164 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
165 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
166 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 167 | break; |
c8b97818 CM |
168 | case Opt_compress: |
169 | printk(KERN_INFO "btrfs: use compression\n"); | |
170 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
171 | break; | |
e18e4809 | 172 | case Opt_ssd: |
edf24abe CH |
173 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
174 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 175 | break; |
21ad10cf | 176 | case Opt_nobarrier: |
edf24abe CH |
177 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
178 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 179 | break; |
4543df7e CM |
180 | case Opt_thread_pool: |
181 | intarg = 0; | |
182 | match_int(&args[0], &intarg); | |
183 | if (intarg) { | |
184 | info->thread_pool_size = intarg; | |
185 | printk(KERN_INFO "btrfs: thread pool %d\n", | |
186 | info->thread_pool_size); | |
187 | } | |
188 | break; | |
c59f8951 | 189 | case Opt_max_extent: |
edf24abe CH |
190 | num = match_strdup(&args[0]); |
191 | if (num) { | |
192 | info->max_extent = btrfs_parse_size(num); | |
193 | kfree(num); | |
194 | ||
195 | info->max_extent = max_t(u64, | |
196 | info->max_extent, root->sectorsize); | |
197 | printk(KERN_INFO "btrfs: max_extent at %llu\n", | |
198 | info->max_extent); | |
c59f8951 CM |
199 | } |
200 | break; | |
6f568d35 | 201 | case Opt_max_inline: |
edf24abe CH |
202 | num = match_strdup(&args[0]); |
203 | if (num) { | |
204 | info->max_inline = btrfs_parse_size(num); | |
205 | kfree(num); | |
206 | ||
15ada040 CM |
207 | if (info->max_inline) { |
208 | info->max_inline = max_t(u64, | |
209 | info->max_inline, | |
210 | root->sectorsize); | |
211 | } | |
edf24abe CH |
212 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
213 | info->max_inline); | |
6f568d35 CM |
214 | } |
215 | break; | |
8f662a76 | 216 | case Opt_alloc_start: |
edf24abe CH |
217 | num = match_strdup(&args[0]); |
218 | if (num) { | |
219 | info->alloc_start = btrfs_parse_size(num); | |
220 | kfree(num); | |
221 | printk(KERN_INFO | |
222 | "btrfs: allocations start at %llu\n", | |
223 | info->alloc_start); | |
8f662a76 CM |
224 | } |
225 | break; | |
33268eaf JB |
226 | case Opt_noacl: |
227 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
228 | break; | |
3a5e1404 SW |
229 | case Opt_notreelog: |
230 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
231 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
232 | break; | |
dccae999 SW |
233 | case Opt_flushoncommit: |
234 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
235 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
236 | break; | |
95e05289 | 237 | default: |
be20aa9d | 238 | break; |
95e05289 CM |
239 | } |
240 | } | |
be20aa9d | 241 | kfree(options); |
edf24abe CH |
242 | return 0; |
243 | } | |
244 | ||
245 | /* | |
246 | * Parse mount options that are required early in the mount process. | |
247 | * | |
248 | * All other options will be parsed on much later in the mount process and | |
249 | * only when we need to allocate a new super block. | |
250 | */ | |
97288f2c | 251 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
43e570b0 CH |
252 | void *holder, char **subvol_name, |
253 | struct btrfs_fs_devices **fs_devices) | |
edf24abe CH |
254 | { |
255 | substring_t args[MAX_OPT_ARGS]; | |
256 | char *opts, *p; | |
257 | int error = 0; | |
258 | ||
259 | if (!options) | |
260 | goto out; | |
261 | ||
262 | /* | |
263 | * strsep changes the string, duplicate it because parse_options | |
264 | * gets called twice | |
265 | */ | |
266 | opts = kstrdup(options, GFP_KERNEL); | |
267 | if (!opts) | |
268 | return -ENOMEM; | |
269 | ||
270 | while ((p = strsep(&opts, ",")) != NULL) { | |
271 | int token; | |
272 | if (!*p) | |
273 | continue; | |
274 | ||
275 | token = match_token(p, tokens, args); | |
276 | switch (token) { | |
277 | case Opt_subvol: | |
278 | *subvol_name = match_strdup(&args[0]); | |
279 | break; | |
43e570b0 CH |
280 | case Opt_device: |
281 | error = btrfs_scan_one_device(match_strdup(&args[0]), | |
282 | flags, holder, fs_devices); | |
283 | if (error) | |
284 | goto out_free_opts; | |
285 | break; | |
edf24abe CH |
286 | default: |
287 | break; | |
288 | } | |
289 | } | |
290 | ||
43e570b0 | 291 | out_free_opts: |
edf24abe CH |
292 | kfree(opts); |
293 | out: | |
294 | /* | |
295 | * If no subvolume name is specified we use the default one. Allocate | |
3de4586c | 296 | * a copy of the string "." here so that code later in the |
edf24abe CH |
297 | * mount path doesn't care if it's the default volume or another one. |
298 | */ | |
299 | if (!*subvol_name) { | |
3de4586c | 300 | *subvol_name = kstrdup(".", GFP_KERNEL); |
edf24abe CH |
301 | if (!*subvol_name) |
302 | return -ENOMEM; | |
303 | } | |
304 | return error; | |
95e05289 CM |
305 | } |
306 | ||
d397712b | 307 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 308 | struct btrfs_fs_devices *fs_devices, |
d397712b | 309 | void *data, int silent) |
75dfe396 | 310 | { |
d397712b CM |
311 | struct inode *inode; |
312 | struct dentry *root_dentry; | |
39279cc3 CM |
313 | struct btrfs_super_block *disk_super; |
314 | struct btrfs_root *tree_root; | |
315 | struct btrfs_inode *bi; | |
316 | int err; | |
a429e513 | 317 | |
39279cc3 CM |
318 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
319 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
320 | sb->s_op = &btrfs_super_ops; | |
be6e8dc0 | 321 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 322 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 323 | sb->s_time_gran = 1; |
33268eaf | 324 | sb->s_flags |= MS_POSIXACL; |
a429e513 | 325 | |
dfe25020 | 326 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
6567e837 | 327 | |
e58ca020 | 328 | if (IS_ERR(tree_root)) { |
39279cc3 | 329 | printk("btrfs: open_ctree failed\n"); |
e58ca020 | 330 | return PTR_ERR(tree_root); |
a429e513 | 331 | } |
39279cc3 | 332 | sb->s_fs_info = tree_root; |
5f39d397 | 333 | disk_super = &tree_root->fs_info->super_copy; |
3de4586c CM |
334 | inode = btrfs_iget_locked(sb, BTRFS_FIRST_FREE_OBJECTID, |
335 | tree_root->fs_info->fs_root); | |
39279cc3 CM |
336 | bi = BTRFS_I(inode); |
337 | bi->location.objectid = inode->i_ino; | |
338 | bi->location.offset = 0; | |
3de4586c | 339 | bi->root = tree_root->fs_info->fs_root; |
b888db2b | 340 | |
39279cc3 | 341 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
a429e513 | 342 | |
39279cc3 | 343 | if (!inode) { |
6567e837 | 344 | err = -ENOMEM; |
39279cc3 | 345 | goto fail_close; |
f254e52c | 346 | } |
39279cc3 CM |
347 | if (inode->i_state & I_NEW) { |
348 | btrfs_read_locked_inode(inode); | |
349 | unlock_new_inode(inode); | |
f254e52c | 350 | } |
f254e52c | 351 | |
39279cc3 CM |
352 | root_dentry = d_alloc_root(inode); |
353 | if (!root_dentry) { | |
354 | iput(inode); | |
355 | err = -ENOMEM; | |
356 | goto fail_close; | |
f254e52c | 357 | } |
e4404d6e | 358 | #if 0 |
58176a96 JB |
359 | /* this does the super kobj at the same time */ |
360 | err = btrfs_sysfs_add_super(tree_root->fs_info); | |
361 | if (err) | |
362 | goto fail_close; | |
e4404d6e | 363 | #endif |
58176a96 | 364 | |
39279cc3 | 365 | sb->s_root = root_dentry; |
6885f308 | 366 | |
6885f308 | 367 | save_mount_options(sb, data); |
2619ba1f | 368 | return 0; |
39279cc3 CM |
369 | |
370 | fail_close: | |
371 | close_ctree(tree_root); | |
372 | return err; | |
2619ba1f CM |
373 | } |
374 | ||
6bf13c0c | 375 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
376 | { |
377 | struct btrfs_trans_handle *trans; | |
dccae999 | 378 | struct btrfs_root *root = btrfs_sb(sb); |
c5739bba | 379 | int ret; |
2619ba1f | 380 | |
c146afad YZ |
381 | if (sb->s_flags & MS_RDONLY) |
382 | return 0; | |
383 | ||
39279cc3 CM |
384 | sb->s_dirt = 0; |
385 | if (!wait) { | |
386 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
387 | return 0; | |
388 | } | |
771ed689 CM |
389 | |
390 | btrfs_start_delalloc_inodes(root); | |
391 | btrfs_wait_ordered_extents(root, 0); | |
392 | ||
c5739bba | 393 | trans = btrfs_start_transaction(root, 1); |
c5739bba | 394 | ret = btrfs_commit_transaction(trans, root); |
39279cc3 | 395 | sb->s_dirt = 0; |
54aa1f4d | 396 | return ret; |
2c90e5d6 CM |
397 | } |
398 | ||
a9572a15 EP |
399 | static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
400 | { | |
401 | struct btrfs_root *root = btrfs_sb(vfs->mnt_sb); | |
402 | struct btrfs_fs_info *info = root->fs_info; | |
403 | ||
404 | if (btrfs_test_opt(root, DEGRADED)) | |
405 | seq_puts(seq, ",degraded"); | |
406 | if (btrfs_test_opt(root, NODATASUM)) | |
407 | seq_puts(seq, ",nodatasum"); | |
408 | if (btrfs_test_opt(root, NODATACOW)) | |
409 | seq_puts(seq, ",nodatacow"); | |
410 | if (btrfs_test_opt(root, NOBARRIER)) | |
411 | seq_puts(seq, ",nobarrier"); | |
412 | if (info->max_extent != (u64)-1) | |
413 | seq_printf(seq, ",max_extent=%llu", info->max_extent); | |
414 | if (info->max_inline != 8192 * 1024) | |
415 | seq_printf(seq, ",max_inline=%llu", info->max_inline); | |
416 | if (info->alloc_start != 0) | |
417 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); | |
418 | if (info->thread_pool_size != min_t(unsigned long, | |
419 | num_online_cpus() + 2, 8)) | |
420 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
421 | if (btrfs_test_opt(root, COMPRESS)) | |
422 | seq_puts(seq, ",compress"); | |
423 | if (btrfs_test_opt(root, SSD)) | |
424 | seq_puts(seq, ",ssd"); | |
3a5e1404 | 425 | if (btrfs_test_opt(root, NOTREELOG)) |
dccae999 SW |
426 | seq_puts(seq, ",no-treelog"); |
427 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) | |
428 | seq_puts(seq, ",flush-on-commit"); | |
a9572a15 EP |
429 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
430 | seq_puts(seq, ",noacl"); | |
431 | return 0; | |
432 | } | |
433 | ||
39279cc3 | 434 | static void btrfs_write_super(struct super_block *sb) |
2c90e5d6 | 435 | { |
39279cc3 | 436 | sb->s_dirt = 0; |
2c90e5d6 CM |
437 | } |
438 | ||
a061fc8d | 439 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 440 | { |
a061fc8d CM |
441 | struct btrfs_fs_devices *test_fs_devices = data; |
442 | struct btrfs_root *root = btrfs_sb(s); | |
4b82d6e4 | 443 | |
a061fc8d | 444 | return root->fs_info->fs_devices == test_fs_devices; |
4b82d6e4 Y |
445 | } |
446 | ||
edf24abe CH |
447 | /* |
448 | * Find a superblock for the given device / mount point. | |
449 | * | |
450 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
451 | * for multiple device setup. Make sure to keep it in sync. | |
452 | */ | |
453 | static int btrfs_get_sb(struct file_system_type *fs_type, int flags, | |
454 | const char *dev_name, void *data, struct vfsmount *mnt) | |
4b82d6e4 | 455 | { |
edf24abe | 456 | char *subvol_name = NULL; |
4b82d6e4 Y |
457 | struct block_device *bdev = NULL; |
458 | struct super_block *s; | |
459 | struct dentry *root; | |
8a4b83cc | 460 | struct btrfs_fs_devices *fs_devices = NULL; |
97288f2c | 461 | fmode_t mode = FMODE_READ; |
4b82d6e4 Y |
462 | int error = 0; |
463 | ||
97288f2c CH |
464 | if (!(flags & MS_RDONLY)) |
465 | mode |= FMODE_WRITE; | |
466 | ||
467 | error = btrfs_parse_early_options(data, mode, fs_type, | |
43e570b0 | 468 | &subvol_name, &fs_devices); |
edf24abe | 469 | if (error) |
1f483660 | 470 | return error; |
edf24abe | 471 | |
97288f2c | 472 | error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices); |
8a4b83cc | 473 | if (error) |
edf24abe | 474 | goto error_free_subvol_name; |
4b82d6e4 | 475 | |
97288f2c | 476 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
8a4b83cc | 477 | if (error) |
edf24abe | 478 | goto error_free_subvol_name; |
8a4b83cc | 479 | |
2b82032c YZ |
480 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
481 | error = -EACCES; | |
482 | goto error_close_devices; | |
483 | } | |
484 | ||
dfe25020 | 485 | bdev = fs_devices->latest_bdev; |
a061fc8d | 486 | s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); |
4b82d6e4 Y |
487 | if (IS_ERR(s)) |
488 | goto error_s; | |
489 | ||
490 | if (s->s_root) { | |
491 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
492 | up_write(&s->s_umount); | |
493 | deactivate_super(s); | |
494 | error = -EBUSY; | |
c146afad | 495 | goto error_close_devices; |
4b82d6e4 Y |
496 | } |
497 | ||
2b82032c | 498 | btrfs_close_devices(fs_devices); |
4b82d6e4 Y |
499 | } else { |
500 | char b[BDEVNAME_SIZE]; | |
501 | ||
502 | s->s_flags = flags; | |
503 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); | |
8a4b83cc CM |
504 | error = btrfs_fill_super(s, fs_devices, data, |
505 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 Y |
506 | if (error) { |
507 | up_write(&s->s_umount); | |
508 | deactivate_super(s); | |
1f483660 | 509 | goto error_free_subvol_name; |
4b82d6e4 Y |
510 | } |
511 | ||
788f20eb | 512 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
4b82d6e4 Y |
513 | s->s_flags |= MS_ACTIVE; |
514 | } | |
515 | ||
76fcef19 DW |
516 | if (!strcmp(subvol_name, ".")) |
517 | root = dget(s->s_root); | |
518 | else { | |
519 | mutex_lock(&s->s_root->d_inode->i_mutex); | |
d397712b CM |
520 | root = lookup_one_len(subvol_name, s->s_root, |
521 | strlen(subvol_name)); | |
76fcef19 | 522 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
d397712b | 523 | |
76fcef19 DW |
524 | if (IS_ERR(root)) { |
525 | up_write(&s->s_umount); | |
526 | deactivate_super(s); | |
527 | error = PTR_ERR(root); | |
1f483660 | 528 | goto error_free_subvol_name; |
76fcef19 DW |
529 | } |
530 | if (!root->d_inode) { | |
531 | dput(root); | |
532 | up_write(&s->s_umount); | |
533 | deactivate_super(s); | |
534 | error = -ENXIO; | |
1f483660 | 535 | goto error_free_subvol_name; |
76fcef19 | 536 | } |
4b82d6e4 Y |
537 | } |
538 | ||
539 | mnt->mnt_sb = s; | |
540 | mnt->mnt_root = root; | |
edf24abe CH |
541 | |
542 | kfree(subvol_name); | |
4b82d6e4 Y |
543 | return 0; |
544 | ||
545 | error_s: | |
546 | error = PTR_ERR(s); | |
c146afad | 547 | error_close_devices: |
8a4b83cc | 548 | btrfs_close_devices(fs_devices); |
edf24abe CH |
549 | error_free_subvol_name: |
550 | kfree(subvol_name); | |
4b82d6e4 Y |
551 | return error; |
552 | } | |
2e635a27 | 553 | |
c146afad YZ |
554 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
555 | { | |
556 | struct btrfs_root *root = btrfs_sb(sb); | |
557 | int ret; | |
558 | ||
b288052e CM |
559 | ret = btrfs_parse_options(root, data); |
560 | if (ret) | |
561 | return -EINVAL; | |
562 | ||
c146afad YZ |
563 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
564 | return 0; | |
565 | ||
566 | if (*flags & MS_RDONLY) { | |
567 | sb->s_flags |= MS_RDONLY; | |
568 | ||
569 | ret = btrfs_commit_super(root); | |
570 | WARN_ON(ret); | |
571 | } else { | |
2b82032c YZ |
572 | if (root->fs_info->fs_devices->rw_devices == 0) |
573 | return -EACCES; | |
574 | ||
c146afad YZ |
575 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) |
576 | return -EINVAL; | |
577 | ||
578 | ret = btrfs_cleanup_reloc_trees(root); | |
579 | WARN_ON(ret); | |
580 | ||
581 | ret = btrfs_cleanup_fs_roots(root->fs_info); | |
582 | WARN_ON(ret); | |
583 | ||
584 | sb->s_flags &= ~MS_RDONLY; | |
585 | } | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
8fd17795 CM |
590 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
591 | { | |
592 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 593 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
db94535d | 594 | int bits = dentry->d_sb->s_blocksize_bits; |
9d03632e | 595 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
8fd17795 CM |
596 | |
597 | buf->f_namelen = BTRFS_NAME_LEN; | |
db94535d CM |
598 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
599 | buf->f_bfree = buf->f_blocks - | |
600 | (btrfs_super_bytes_used(disk_super) >> bits); | |
8fd17795 CM |
601 | buf->f_bavail = buf->f_bfree; |
602 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
603 | buf->f_type = BTRFS_SUPER_MAGIC; | |
d397712b | 604 | |
9d03632e | 605 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 606 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
607 | on a big-endian or little-endian host */ |
608 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
609 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
610 | /* Mask in the root object ID too, to disambiguate subvols */ |
611 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
612 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
613 | ||
8fd17795 CM |
614 | return 0; |
615 | } | |
b5133862 | 616 | |
2e635a27 CM |
617 | static struct file_system_type btrfs_fs_type = { |
618 | .owner = THIS_MODULE, | |
619 | .name = "btrfs", | |
620 | .get_sb = btrfs_get_sb, | |
a061fc8d | 621 | .kill_sb = kill_anon_super, |
2e635a27 CM |
622 | .fs_flags = FS_REQUIRES_DEV, |
623 | }; | |
a9218f6b | 624 | |
d352ac68 CM |
625 | /* |
626 | * used by btrfsctl to scan devices when no FS is mounted | |
627 | */ | |
8a4b83cc CM |
628 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
629 | unsigned long arg) | |
630 | { | |
631 | struct btrfs_ioctl_vol_args *vol; | |
632 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 633 | int ret = -ENOTTY; |
8a4b83cc | 634 | |
e441d54d CM |
635 | if (!capable(CAP_SYS_ADMIN)) |
636 | return -EPERM; | |
637 | ||
8a4b83cc | 638 | vol = kmalloc(sizeof(*vol), GFP_KERNEL); |
19d00cc1 WC |
639 | if (!vol) |
640 | return -ENOMEM; | |
641 | ||
8a4b83cc CM |
642 | if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) { |
643 | ret = -EFAULT; | |
644 | goto out; | |
645 | } | |
c071fcfd | 646 | |
8a4b83cc CM |
647 | switch (cmd) { |
648 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 649 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
650 | &btrfs_fs_type, &fs_devices); |
651 | break; | |
652 | } | |
653 | out: | |
654 | kfree(vol); | |
f819d837 | 655 | return ret; |
8a4b83cc CM |
656 | } |
657 | ||
0176260f | 658 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b Y |
659 | { |
660 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
661 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
662 | mutex_lock(&root->fs_info->cleaner_mutex); | |
0176260f | 663 | return 0; |
ed0dab6b Y |
664 | } |
665 | ||
0176260f | 666 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b Y |
667 | { |
668 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
669 | mutex_unlock(&root->fs_info->cleaner_mutex); |
670 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
0176260f | 671 | return 0; |
ed0dab6b | 672 | } |
2e635a27 | 673 | |
e20d96d6 | 674 | static struct super_operations btrfs_super_ops = { |
134e9731 | 675 | .delete_inode = btrfs_delete_inode, |
e20d96d6 | 676 | .put_super = btrfs_put_super, |
d5719762 CM |
677 | .write_super = btrfs_write_super, |
678 | .sync_fs = btrfs_sync_fs, | |
a9572a15 | 679 | .show_options = btrfs_show_options, |
4730a4bc | 680 | .write_inode = btrfs_write_inode, |
b5133862 | 681 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
682 | .alloc_inode = btrfs_alloc_inode, |
683 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 684 | .statfs = btrfs_statfs, |
c146afad | 685 | .remount_fs = btrfs_remount, |
0176260f LT |
686 | .freeze_fs = btrfs_freeze, |
687 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 688 | }; |
a9218f6b CM |
689 | |
690 | static const struct file_operations btrfs_ctl_fops = { | |
691 | .unlocked_ioctl = btrfs_control_ioctl, | |
692 | .compat_ioctl = btrfs_control_ioctl, | |
693 | .owner = THIS_MODULE, | |
694 | }; | |
695 | ||
696 | static struct miscdevice btrfs_misc = { | |
697 | .minor = MISC_DYNAMIC_MINOR, | |
698 | .name = "btrfs-control", | |
699 | .fops = &btrfs_ctl_fops | |
700 | }; | |
701 | ||
702 | static int btrfs_interface_init(void) | |
703 | { | |
704 | return misc_register(&btrfs_misc); | |
705 | } | |
706 | ||
b2950863 | 707 | static void btrfs_interface_exit(void) |
a9218f6b CM |
708 | { |
709 | if (misc_deregister(&btrfs_misc) < 0) | |
d397712b | 710 | printk(KERN_INFO "misc_deregister failed for control device"); |
a9218f6b CM |
711 | } |
712 | ||
2e635a27 CM |
713 | static int __init init_btrfs_fs(void) |
714 | { | |
2c90e5d6 | 715 | int err; |
58176a96 JB |
716 | |
717 | err = btrfs_init_sysfs(); | |
718 | if (err) | |
719 | return err; | |
720 | ||
39279cc3 | 721 | err = btrfs_init_cachep(); |
2c90e5d6 | 722 | if (err) |
a74a4b97 | 723 | goto free_sysfs; |
d1310b2e CM |
724 | |
725 | err = extent_io_init(); | |
2f4cbe64 WB |
726 | if (err) |
727 | goto free_cachep; | |
728 | ||
d1310b2e CM |
729 | err = extent_map_init(); |
730 | if (err) | |
731 | goto free_extent_io; | |
732 | ||
a9218f6b | 733 | err = btrfs_interface_init(); |
2f4cbe64 WB |
734 | if (err) |
735 | goto free_extent_map; | |
c8b97818 | 736 | |
a9218f6b CM |
737 | err = register_filesystem(&btrfs_fs_type); |
738 | if (err) | |
739 | goto unregister_ioctl; | |
b3c3da71 CM |
740 | |
741 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); | |
2f4cbe64 WB |
742 | return 0; |
743 | ||
a9218f6b CM |
744 | unregister_ioctl: |
745 | btrfs_interface_exit(); | |
2f4cbe64 WB |
746 | free_extent_map: |
747 | extent_map_exit(); | |
d1310b2e CM |
748 | free_extent_io: |
749 | extent_io_exit(); | |
2f4cbe64 WB |
750 | free_cachep: |
751 | btrfs_destroy_cachep(); | |
a74a4b97 | 752 | free_sysfs: |
2f4cbe64 WB |
753 | btrfs_exit_sysfs(); |
754 | return err; | |
2e635a27 CM |
755 | } |
756 | ||
757 | static void __exit exit_btrfs_fs(void) | |
758 | { | |
39279cc3 | 759 | btrfs_destroy_cachep(); |
a52d9a80 | 760 | extent_map_exit(); |
d1310b2e | 761 | extent_io_exit(); |
a9218f6b | 762 | btrfs_interface_exit(); |
2e635a27 | 763 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 764 | btrfs_exit_sysfs(); |
8a4b83cc | 765 | btrfs_cleanup_fs_uuids(); |
c8b97818 | 766 | btrfs_zlib_exit(); |
2e635a27 CM |
767 | } |
768 | ||
769 | module_init(init_btrfs_fs) | |
770 | module_exit(exit_btrfs_fs) | |
771 | ||
772 | MODULE_LICENSE("GPL"); |