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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> | |
27 | #include <linux/string.h> | |
28 | #include <linux/smp_lock.h> | |
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> |
2e635a27 | 40 | #include "ctree.h" |
e20d96d6 | 41 | #include "disk-io.h" |
d5719762 | 42 | #include "transaction.h" |
2c90e5d6 | 43 | #include "btrfs_inode.h" |
c5739bba | 44 | #include "ioctl.h" |
3a686375 | 45 | #include "print-tree.h" |
5103e947 | 46 | #include "xattr.h" |
8a4b83cc | 47 | #include "volumes.h" |
2e635a27 | 48 | |
5f39d397 | 49 | #define BTRFS_SUPER_MAGIC 0x9123683E |
f254e52c | 50 | |
39279cc3 | 51 | static struct super_operations btrfs_super_ops; |
75dfe396 | 52 | |
39279cc3 | 53 | static void btrfs_put_super (struct super_block * sb) |
b18c6685 | 54 | { |
39279cc3 | 55 | struct btrfs_root *root = btrfs_sb(sb); |
58176a96 | 56 | struct btrfs_fs_info *fs = root->fs_info; |
b18c6685 | 57 | int ret; |
b18c6685 | 58 | |
39279cc3 CM |
59 | ret = close_ctree(root); |
60 | if (ret) { | |
61 | printk("close ctree returns %d\n", ret); | |
75dfe396 | 62 | } |
58176a96 | 63 | btrfs_sysfs_del_super(fs); |
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, |
4543df7e | 70 | Opt_ssd, Opt_thread_pool, Opt_err, |
95e05289 CM |
71 | }; |
72 | ||
73 | static match_table_t tokens = { | |
dfe25020 | 74 | {Opt_degraded, "degraded"}, |
95e05289 | 75 | {Opt_subvol, "subvol=%s"}, |
43e570b0 | 76 | {Opt_device, "device=%s"}, |
b6cda9bc | 77 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 78 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 79 | {Opt_nobarrier, "nobarrier"}, |
c59f8951 | 80 | {Opt_max_extent, "max_extent=%s"}, |
6f568d35 | 81 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 82 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 83 | {Opt_thread_pool, "thread_pool=%d"}, |
e18e4809 | 84 | {Opt_ssd, "ssd"}, |
95e05289 CM |
85 | {Opt_err, NULL} |
86 | }; | |
87 | ||
edbd8d4e | 88 | u64 btrfs_parse_size(char *str) |
c59f8951 | 89 | { |
edbd8d4e | 90 | u64 res; |
c59f8951 CM |
91 | int mult = 1; |
92 | char *end; | |
93 | char last; | |
94 | ||
95 | res = simple_strtoul(str, &end, 10); | |
96 | ||
97 | last = end[0]; | |
98 | if (isalpha(last)) { | |
99 | last = tolower(last); | |
100 | switch (last) { | |
101 | case 'g': | |
102 | mult *= 1024; | |
103 | case 'm': | |
104 | mult *= 1024; | |
105 | case 'k': | |
106 | mult *= 1024; | |
107 | } | |
108 | res = res * mult; | |
109 | } | |
110 | return res; | |
111 | } | |
112 | ||
edf24abe CH |
113 | /* |
114 | * Regular mount options parser. Everything that is needed only when | |
115 | * reading in a new superblock is parsed here. | |
116 | */ | |
117 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 118 | { |
edf24abe | 119 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 120 | substring_t args[MAX_OPT_ARGS]; |
edf24abe | 121 | char *p, *num; |
4543df7e | 122 | int intarg; |
b6cda9bc | 123 | |
95e05289 | 124 | if (!options) |
edf24abe | 125 | return 0; |
95e05289 | 126 | |
be20aa9d CM |
127 | /* |
128 | * strsep changes the string, duplicate it because parse_options | |
129 | * gets called twice | |
130 | */ | |
131 | options = kstrdup(options, GFP_NOFS); | |
132 | if (!options) | |
133 | return -ENOMEM; | |
134 | ||
be20aa9d | 135 | |
edf24abe | 136 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
137 | int token; |
138 | if (!*p) | |
139 | continue; | |
140 | ||
141 | token = match_token(p, tokens, args); | |
142 | switch (token) { | |
dfe25020 | 143 | case Opt_degraded: |
edf24abe CH |
144 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
145 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 146 | break; |
95e05289 | 147 | case Opt_subvol: |
43e570b0 | 148 | case Opt_device: |
edf24abe | 149 | /* |
43e570b0 | 150 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
151 | * and can be happily ignored here. |
152 | */ | |
b6cda9bc CM |
153 | break; |
154 | case Opt_nodatasum: | |
edf24abe CH |
155 | printk(KERN_INFO "btrfs: setting nodatacsum\n"); |
156 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
be20aa9d CM |
157 | break; |
158 | case Opt_nodatacow: | |
edf24abe CH |
159 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
160 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
161 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 162 | break; |
e18e4809 | 163 | case Opt_ssd: |
edf24abe CH |
164 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
165 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 166 | break; |
21ad10cf | 167 | case Opt_nobarrier: |
edf24abe CH |
168 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
169 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 170 | break; |
4543df7e CM |
171 | case Opt_thread_pool: |
172 | intarg = 0; | |
173 | match_int(&args[0], &intarg); | |
174 | if (intarg) { | |
175 | info->thread_pool_size = intarg; | |
176 | printk(KERN_INFO "btrfs: thread pool %d\n", | |
177 | info->thread_pool_size); | |
178 | } | |
179 | break; | |
c59f8951 | 180 | case Opt_max_extent: |
edf24abe CH |
181 | num = match_strdup(&args[0]); |
182 | if (num) { | |
183 | info->max_extent = btrfs_parse_size(num); | |
184 | kfree(num); | |
185 | ||
186 | info->max_extent = max_t(u64, | |
187 | info->max_extent, root->sectorsize); | |
188 | printk(KERN_INFO "btrfs: max_extent at %llu\n", | |
189 | info->max_extent); | |
c59f8951 CM |
190 | } |
191 | break; | |
6f568d35 | 192 | case Opt_max_inline: |
edf24abe CH |
193 | num = match_strdup(&args[0]); |
194 | if (num) { | |
195 | info->max_inline = btrfs_parse_size(num); | |
196 | kfree(num); | |
197 | ||
15ada040 CM |
198 | if (info->max_inline) { |
199 | info->max_inline = max_t(u64, | |
200 | info->max_inline, | |
201 | root->sectorsize); | |
202 | } | |
edf24abe CH |
203 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
204 | info->max_inline); | |
6f568d35 CM |
205 | } |
206 | break; | |
8f662a76 | 207 | case Opt_alloc_start: |
edf24abe CH |
208 | num = match_strdup(&args[0]); |
209 | if (num) { | |
210 | info->alloc_start = btrfs_parse_size(num); | |
211 | kfree(num); | |
212 | printk(KERN_INFO | |
213 | "btrfs: allocations start at %llu\n", | |
214 | info->alloc_start); | |
8f662a76 CM |
215 | } |
216 | break; | |
95e05289 | 217 | default: |
be20aa9d | 218 | break; |
95e05289 CM |
219 | } |
220 | } | |
be20aa9d | 221 | kfree(options); |
edf24abe CH |
222 | return 0; |
223 | } | |
224 | ||
225 | /* | |
226 | * Parse mount options that are required early in the mount process. | |
227 | * | |
228 | * All other options will be parsed on much later in the mount process and | |
229 | * only when we need to allocate a new super block. | |
230 | */ | |
43e570b0 CH |
231 | static int btrfs_parse_early_options(const char *options, int flags, |
232 | void *holder, char **subvol_name, | |
233 | struct btrfs_fs_devices **fs_devices) | |
edf24abe CH |
234 | { |
235 | substring_t args[MAX_OPT_ARGS]; | |
236 | char *opts, *p; | |
237 | int error = 0; | |
238 | ||
239 | if (!options) | |
240 | goto out; | |
241 | ||
242 | /* | |
243 | * strsep changes the string, duplicate it because parse_options | |
244 | * gets called twice | |
245 | */ | |
246 | opts = kstrdup(options, GFP_KERNEL); | |
247 | if (!opts) | |
248 | return -ENOMEM; | |
249 | ||
250 | while ((p = strsep(&opts, ",")) != NULL) { | |
251 | int token; | |
252 | if (!*p) | |
253 | continue; | |
254 | ||
255 | token = match_token(p, tokens, args); | |
256 | switch (token) { | |
257 | case Opt_subvol: | |
258 | *subvol_name = match_strdup(&args[0]); | |
259 | break; | |
43e570b0 CH |
260 | case Opt_device: |
261 | error = btrfs_scan_one_device(match_strdup(&args[0]), | |
262 | flags, holder, fs_devices); | |
263 | if (error) | |
264 | goto out_free_opts; | |
265 | break; | |
edf24abe CH |
266 | default: |
267 | break; | |
268 | } | |
269 | } | |
270 | ||
43e570b0 | 271 | out_free_opts: |
edf24abe CH |
272 | kfree(opts); |
273 | out: | |
274 | /* | |
275 | * If no subvolume name is specified we use the default one. Allocate | |
276 | * a copy of the string "default" here so that code later in the | |
277 | * mount path doesn't care if it's the default volume or another one. | |
278 | */ | |
279 | if (!*subvol_name) { | |
280 | *subvol_name = kstrdup("default", GFP_KERNEL); | |
281 | if (!*subvol_name) | |
282 | return -ENOMEM; | |
283 | } | |
284 | return error; | |
95e05289 CM |
285 | } |
286 | ||
8a4b83cc CM |
287 | static int btrfs_fill_super(struct super_block * sb, |
288 | struct btrfs_fs_devices *fs_devices, | |
289 | void * data, int silent) | |
75dfe396 | 290 | { |
39279cc3 CM |
291 | struct inode * inode; |
292 | struct dentry * root_dentry; | |
293 | struct btrfs_super_block *disk_super; | |
294 | struct btrfs_root *tree_root; | |
295 | struct btrfs_inode *bi; | |
296 | int err; | |
a429e513 | 297 | |
39279cc3 CM |
298 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
299 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
300 | sb->s_op = &btrfs_super_ops; | |
5103e947 | 301 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 302 | sb->s_time_gran = 1; |
a429e513 | 303 | |
dfe25020 | 304 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
6567e837 | 305 | |
e58ca020 | 306 | if (IS_ERR(tree_root)) { |
39279cc3 | 307 | printk("btrfs: open_ctree failed\n"); |
e58ca020 | 308 | return PTR_ERR(tree_root); |
a429e513 | 309 | } |
39279cc3 | 310 | sb->s_fs_info = tree_root; |
5f39d397 | 311 | disk_super = &tree_root->fs_info->super_copy; |
39279cc3 CM |
312 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
313 | tree_root); | |
314 | bi = BTRFS_I(inode); | |
315 | bi->location.objectid = inode->i_ino; | |
316 | bi->location.offset = 0; | |
39279cc3 | 317 | bi->root = tree_root; |
b888db2b | 318 | |
39279cc3 | 319 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
a429e513 | 320 | |
39279cc3 | 321 | if (!inode) { |
6567e837 | 322 | err = -ENOMEM; |
39279cc3 | 323 | goto fail_close; |
f254e52c | 324 | } |
39279cc3 CM |
325 | if (inode->i_state & I_NEW) { |
326 | btrfs_read_locked_inode(inode); | |
327 | unlock_new_inode(inode); | |
f254e52c | 328 | } |
f254e52c | 329 | |
39279cc3 CM |
330 | root_dentry = d_alloc_root(inode); |
331 | if (!root_dentry) { | |
332 | iput(inode); | |
333 | err = -ENOMEM; | |
334 | goto fail_close; | |
f254e52c | 335 | } |
58176a96 JB |
336 | |
337 | /* this does the super kobj at the same time */ | |
338 | err = btrfs_sysfs_add_super(tree_root->fs_info); | |
339 | if (err) | |
340 | goto fail_close; | |
341 | ||
39279cc3 CM |
342 | sb->s_root = root_dentry; |
343 | btrfs_transaction_queue_work(tree_root, HZ * 30); | |
6885f308 CM |
344 | |
345 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25) | |
346 | save_mount_options(sb, data); | |
347 | #endif | |
348 | ||
2619ba1f | 349 | return 0; |
39279cc3 CM |
350 | |
351 | fail_close: | |
352 | close_ctree(tree_root); | |
353 | return err; | |
2619ba1f CM |
354 | } |
355 | ||
6bf13c0c | 356 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
357 | { |
358 | struct btrfs_trans_handle *trans; | |
39279cc3 | 359 | struct btrfs_root *root; |
c5739bba | 360 | int ret; |
39279cc3 | 361 | root = btrfs_sb(sb); |
2619ba1f | 362 | |
39279cc3 CM |
363 | sb->s_dirt = 0; |
364 | if (!wait) { | |
365 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
366 | return 0; | |
367 | } | |
e9d0b13b | 368 | btrfs_clean_old_snapshots(root); |
e9d0b13b | 369 | btrfs_defrag_dirty_roots(root->fs_info); |
c5739bba | 370 | trans = btrfs_start_transaction(root, 1); |
c5739bba | 371 | ret = btrfs_commit_transaction(trans, root); |
39279cc3 | 372 | sb->s_dirt = 0; |
54aa1f4d | 373 | return ret; |
2c90e5d6 CM |
374 | } |
375 | ||
39279cc3 | 376 | static void btrfs_write_super(struct super_block *sb) |
2c90e5d6 | 377 | { |
39279cc3 | 378 | sb->s_dirt = 0; |
2c90e5d6 CM |
379 | } |
380 | ||
a061fc8d | 381 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 382 | { |
a061fc8d CM |
383 | struct btrfs_fs_devices *test_fs_devices = data; |
384 | struct btrfs_root *root = btrfs_sb(s); | |
4b82d6e4 | 385 | |
a061fc8d | 386 | return root->fs_info->fs_devices == test_fs_devices; |
4b82d6e4 Y |
387 | } |
388 | ||
edf24abe CH |
389 | /* |
390 | * Find a superblock for the given device / mount point. | |
391 | * | |
392 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
393 | * for multiple device setup. Make sure to keep it in sync. | |
394 | */ | |
395 | static int btrfs_get_sb(struct file_system_type *fs_type, int flags, | |
396 | const char *dev_name, void *data, struct vfsmount *mnt) | |
4b82d6e4 | 397 | { |
edf24abe | 398 | char *subvol_name = NULL; |
4b82d6e4 Y |
399 | struct block_device *bdev = NULL; |
400 | struct super_block *s; | |
401 | struct dentry *root; | |
8a4b83cc | 402 | struct btrfs_fs_devices *fs_devices = NULL; |
4b82d6e4 Y |
403 | int error = 0; |
404 | ||
43e570b0 CH |
405 | error = btrfs_parse_early_options(data, flags, fs_type, |
406 | &subvol_name, &fs_devices); | |
edf24abe CH |
407 | if (error) |
408 | goto error; | |
409 | ||
8a4b83cc CM |
410 | error = btrfs_scan_one_device(dev_name, flags, fs_type, &fs_devices); |
411 | if (error) | |
edf24abe | 412 | goto error_free_subvol_name; |
4b82d6e4 | 413 | |
8a4b83cc CM |
414 | error = btrfs_open_devices(fs_devices, flags, fs_type); |
415 | if (error) | |
edf24abe | 416 | goto error_free_subvol_name; |
8a4b83cc | 417 | |
dfe25020 | 418 | bdev = fs_devices->latest_bdev; |
a061fc8d CM |
419 | btrfs_lock_volumes(); |
420 | s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); | |
421 | btrfs_unlock_volumes(); | |
4b82d6e4 Y |
422 | if (IS_ERR(s)) |
423 | goto error_s; | |
424 | ||
425 | if (s->s_root) { | |
426 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
427 | up_write(&s->s_umount); | |
428 | deactivate_super(s); | |
429 | error = -EBUSY; | |
430 | goto error_bdev; | |
431 | } | |
432 | ||
4b82d6e4 Y |
433 | } else { |
434 | char b[BDEVNAME_SIZE]; | |
435 | ||
436 | s->s_flags = flags; | |
437 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); | |
8a4b83cc CM |
438 | error = btrfs_fill_super(s, fs_devices, data, |
439 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 Y |
440 | if (error) { |
441 | up_write(&s->s_umount); | |
442 | deactivate_super(s); | |
443 | goto error; | |
444 | } | |
445 | ||
788f20eb | 446 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
4b82d6e4 Y |
447 | s->s_flags |= MS_ACTIVE; |
448 | } | |
449 | ||
edf24abe CH |
450 | root = lookup_one_len(subvol_name, s->s_root, strlen(subvol_name)); |
451 | if (IS_ERR(root)) { | |
452 | up_write(&s->s_umount); | |
453 | deactivate_super(s); | |
454 | error = PTR_ERR(root); | |
455 | goto error; | |
456 | } | |
457 | if (!root->d_inode) { | |
458 | dput(root); | |
459 | up_write(&s->s_umount); | |
460 | deactivate_super(s); | |
461 | error = -ENXIO; | |
462 | goto error; | |
4b82d6e4 Y |
463 | } |
464 | ||
465 | mnt->mnt_sb = s; | |
466 | mnt->mnt_root = root; | |
edf24abe CH |
467 | |
468 | kfree(subvol_name); | |
4b82d6e4 Y |
469 | return 0; |
470 | ||
471 | error_s: | |
472 | error = PTR_ERR(s); | |
473 | error_bdev: | |
8a4b83cc | 474 | btrfs_close_devices(fs_devices); |
edf24abe CH |
475 | error_free_subvol_name: |
476 | kfree(subvol_name); | |
4b82d6e4 Y |
477 | error: |
478 | return error; | |
479 | } | |
2e635a27 | 480 | |
8fd17795 CM |
481 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
482 | { | |
483 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 484 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
db94535d | 485 | int bits = dentry->d_sb->s_blocksize_bits; |
8fd17795 CM |
486 | |
487 | buf->f_namelen = BTRFS_NAME_LEN; | |
db94535d CM |
488 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
489 | buf->f_bfree = buf->f_blocks - | |
490 | (btrfs_super_bytes_used(disk_super) >> bits); | |
8fd17795 CM |
491 | buf->f_bavail = buf->f_bfree; |
492 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
493 | buf->f_type = BTRFS_SUPER_MAGIC; | |
494 | return 0; | |
495 | } | |
b5133862 | 496 | |
2e635a27 CM |
497 | static struct file_system_type btrfs_fs_type = { |
498 | .owner = THIS_MODULE, | |
499 | .name = "btrfs", | |
500 | .get_sb = btrfs_get_sb, | |
a061fc8d | 501 | .kill_sb = kill_anon_super, |
2e635a27 CM |
502 | .fs_flags = FS_REQUIRES_DEV, |
503 | }; | |
a9218f6b | 504 | |
8a4b83cc CM |
505 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
506 | unsigned long arg) | |
507 | { | |
508 | struct btrfs_ioctl_vol_args *vol; | |
509 | struct btrfs_fs_devices *fs_devices; | |
f819d837 | 510 | int ret = 0; |
8a4b83cc CM |
511 | int len; |
512 | ||
513 | vol = kmalloc(sizeof(*vol), GFP_KERNEL); | |
514 | if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) { | |
515 | ret = -EFAULT; | |
516 | goto out; | |
517 | } | |
518 | len = strnlen(vol->name, BTRFS_PATH_NAME_MAX); | |
519 | switch (cmd) { | |
520 | case BTRFS_IOC_SCAN_DEV: | |
521 | ret = btrfs_scan_one_device(vol->name, MS_RDONLY, | |
522 | &btrfs_fs_type, &fs_devices); | |
523 | break; | |
524 | } | |
525 | out: | |
526 | kfree(vol); | |
f819d837 | 527 | return ret; |
8a4b83cc CM |
528 | } |
529 | ||
ed0dab6b Y |
530 | static void btrfs_write_super_lockfs(struct super_block *sb) |
531 | { | |
532 | struct btrfs_root *root = btrfs_sb(sb); | |
533 | btrfs_transaction_flush_work(root); | |
534 | } | |
535 | ||
536 | static void btrfs_unlockfs(struct super_block *sb) | |
537 | { | |
538 | struct btrfs_root *root = btrfs_sb(sb); | |
539 | btrfs_transaction_queue_work(root, HZ * 30); | |
540 | } | |
2e635a27 | 541 | |
e20d96d6 | 542 | static struct super_operations btrfs_super_ops = { |
134e9731 | 543 | .delete_inode = btrfs_delete_inode, |
e20d96d6 | 544 | .put_super = btrfs_put_super, |
d5719762 CM |
545 | .write_super = btrfs_write_super, |
546 | .sync_fs = btrfs_sync_fs, | |
6885f308 CM |
547 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25) |
548 | .read_inode = btrfs_read_locked_inode, | |
549 | #else | |
550 | .show_options = generic_show_options, | |
551 | #endif | |
4730a4bc | 552 | .write_inode = btrfs_write_inode, |
b5133862 | 553 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
554 | .alloc_inode = btrfs_alloc_inode, |
555 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 556 | .statfs = btrfs_statfs, |
ed0dab6b Y |
557 | .write_super_lockfs = btrfs_write_super_lockfs, |
558 | .unlockfs = btrfs_unlockfs, | |
e20d96d6 | 559 | }; |
a9218f6b CM |
560 | |
561 | static const struct file_operations btrfs_ctl_fops = { | |
562 | .unlocked_ioctl = btrfs_control_ioctl, | |
563 | .compat_ioctl = btrfs_control_ioctl, | |
564 | .owner = THIS_MODULE, | |
565 | }; | |
566 | ||
567 | static struct miscdevice btrfs_misc = { | |
568 | .minor = MISC_DYNAMIC_MINOR, | |
569 | .name = "btrfs-control", | |
570 | .fops = &btrfs_ctl_fops | |
571 | }; | |
572 | ||
573 | static int btrfs_interface_init(void) | |
574 | { | |
575 | return misc_register(&btrfs_misc); | |
576 | } | |
577 | ||
578 | void btrfs_interface_exit(void) | |
579 | { | |
580 | if (misc_deregister(&btrfs_misc) < 0) | |
581 | printk("misc_deregister failed for control device"); | |
582 | } | |
583 | ||
2e635a27 CM |
584 | static int __init init_btrfs_fs(void) |
585 | { | |
2c90e5d6 | 586 | int err; |
58176a96 JB |
587 | |
588 | err = btrfs_init_sysfs(); | |
589 | if (err) | |
590 | return err; | |
591 | ||
08607c1b | 592 | btrfs_init_transaction_sys(); |
39279cc3 | 593 | err = btrfs_init_cachep(); |
2c90e5d6 | 594 | if (err) |
2f4cbe64 | 595 | goto free_transaction_sys; |
d1310b2e CM |
596 | |
597 | err = extent_io_init(); | |
2f4cbe64 WB |
598 | if (err) |
599 | goto free_cachep; | |
600 | ||
d1310b2e CM |
601 | err = extent_map_init(); |
602 | if (err) | |
603 | goto free_extent_io; | |
604 | ||
a9218f6b | 605 | err = btrfs_interface_init(); |
2f4cbe64 WB |
606 | if (err) |
607 | goto free_extent_map; | |
a9218f6b CM |
608 | err = register_filesystem(&btrfs_fs_type); |
609 | if (err) | |
610 | goto unregister_ioctl; | |
2f4cbe64 WB |
611 | return 0; |
612 | ||
a9218f6b CM |
613 | unregister_ioctl: |
614 | btrfs_interface_exit(); | |
2f4cbe64 WB |
615 | free_extent_map: |
616 | extent_map_exit(); | |
d1310b2e CM |
617 | free_extent_io: |
618 | extent_io_exit(); | |
2f4cbe64 WB |
619 | free_cachep: |
620 | btrfs_destroy_cachep(); | |
621 | free_transaction_sys: | |
622 | btrfs_exit_transaction_sys(); | |
623 | btrfs_exit_sysfs(); | |
624 | return err; | |
2e635a27 CM |
625 | } |
626 | ||
627 | static void __exit exit_btrfs_fs(void) | |
628 | { | |
08607c1b | 629 | btrfs_exit_transaction_sys(); |
39279cc3 | 630 | btrfs_destroy_cachep(); |
a52d9a80 | 631 | extent_map_exit(); |
d1310b2e | 632 | extent_io_exit(); |
a9218f6b | 633 | btrfs_interface_exit(); |
2e635a27 | 634 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 635 | btrfs_exit_sysfs(); |
8a4b83cc | 636 | btrfs_cleanup_fs_uuids(); |
2e635a27 CM |
637 | } |
638 | ||
639 | module_init(init_btrfs_fs) | |
640 | module_exit(exit_btrfs_fs) | |
641 | ||
642 | MODULE_LICENSE("GPL"); |