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" |
b3c3da71 | 48 | #include "version.h" |
be6e8dc0 | 49 | #include "export.h" |
2e635a27 | 50 | |
5f39d397 | 51 | #define BTRFS_SUPER_MAGIC 0x9123683E |
f254e52c | 52 | |
39279cc3 | 53 | static struct super_operations btrfs_super_ops; |
75dfe396 | 54 | |
39279cc3 | 55 | static void btrfs_put_super (struct super_block * sb) |
b18c6685 | 56 | { |
39279cc3 | 57 | struct btrfs_root *root = btrfs_sb(sb); |
58176a96 | 58 | struct btrfs_fs_info *fs = root->fs_info; |
b18c6685 | 59 | int ret; |
b18c6685 | 60 | |
39279cc3 CM |
61 | ret = close_ctree(root); |
62 | if (ret) { | |
63 | printk("close ctree returns %d\n", ret); | |
75dfe396 | 64 | } |
58176a96 | 65 | btrfs_sysfs_del_super(fs); |
39279cc3 | 66 | sb->s_fs_info = NULL; |
75dfe396 CM |
67 | } |
68 | ||
95e05289 | 69 | enum { |
43e570b0 | 70 | Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow, |
dfe25020 | 71 | Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, |
33268eaf | 72 | Opt_ssd, Opt_thread_pool, Opt_noacl, Opt_err, |
95e05289 CM |
73 | }; |
74 | ||
75 | static match_table_t tokens = { | |
dfe25020 | 76 | {Opt_degraded, "degraded"}, |
95e05289 | 77 | {Opt_subvol, "subvol=%s"}, |
43e570b0 | 78 | {Opt_device, "device=%s"}, |
b6cda9bc | 79 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 80 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 81 | {Opt_nobarrier, "nobarrier"}, |
c59f8951 | 82 | {Opt_max_extent, "max_extent=%s"}, |
6f568d35 | 83 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 84 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 85 | {Opt_thread_pool, "thread_pool=%d"}, |
e18e4809 | 86 | {Opt_ssd, "ssd"}, |
33268eaf JB |
87 | {Opt_noacl, "noacl"}, |
88 | {Opt_err, NULL}, | |
95e05289 CM |
89 | }; |
90 | ||
edbd8d4e | 91 | u64 btrfs_parse_size(char *str) |
c59f8951 | 92 | { |
edbd8d4e | 93 | u64 res; |
c59f8951 CM |
94 | int mult = 1; |
95 | char *end; | |
96 | char last; | |
97 | ||
98 | res = simple_strtoul(str, &end, 10); | |
99 | ||
100 | last = end[0]; | |
101 | if (isalpha(last)) { | |
102 | last = tolower(last); | |
103 | switch (last) { | |
104 | case 'g': | |
105 | mult *= 1024; | |
106 | case 'm': | |
107 | mult *= 1024; | |
108 | case 'k': | |
109 | mult *= 1024; | |
110 | } | |
111 | res = res * mult; | |
112 | } | |
113 | return res; | |
114 | } | |
115 | ||
edf24abe CH |
116 | /* |
117 | * Regular mount options parser. Everything that is needed only when | |
118 | * reading in a new superblock is parsed here. | |
119 | */ | |
120 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 121 | { |
edf24abe | 122 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 123 | substring_t args[MAX_OPT_ARGS]; |
edf24abe | 124 | char *p, *num; |
4543df7e | 125 | int intarg; |
b6cda9bc | 126 | |
95e05289 | 127 | if (!options) |
edf24abe | 128 | return 0; |
95e05289 | 129 | |
be20aa9d CM |
130 | /* |
131 | * strsep changes the string, duplicate it because parse_options | |
132 | * gets called twice | |
133 | */ | |
134 | options = kstrdup(options, GFP_NOFS); | |
135 | if (!options) | |
136 | return -ENOMEM; | |
137 | ||
be20aa9d | 138 | |
edf24abe | 139 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
140 | int token; |
141 | if (!*p) | |
142 | continue; | |
143 | ||
144 | token = match_token(p, tokens, args); | |
145 | switch (token) { | |
dfe25020 | 146 | case Opt_degraded: |
edf24abe CH |
147 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
148 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 149 | break; |
95e05289 | 150 | case Opt_subvol: |
43e570b0 | 151 | case Opt_device: |
edf24abe | 152 | /* |
43e570b0 | 153 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
154 | * and can be happily ignored here. |
155 | */ | |
b6cda9bc CM |
156 | break; |
157 | case Opt_nodatasum: | |
edf24abe CH |
158 | printk(KERN_INFO "btrfs: setting nodatacsum\n"); |
159 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
be20aa9d CM |
160 | break; |
161 | case Opt_nodatacow: | |
edf24abe CH |
162 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
163 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
164 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 165 | break; |
e18e4809 | 166 | case Opt_ssd: |
edf24abe CH |
167 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
168 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 169 | break; |
21ad10cf | 170 | case Opt_nobarrier: |
edf24abe CH |
171 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
172 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 173 | break; |
4543df7e CM |
174 | case Opt_thread_pool: |
175 | intarg = 0; | |
176 | match_int(&args[0], &intarg); | |
177 | if (intarg) { | |
178 | info->thread_pool_size = intarg; | |
179 | printk(KERN_INFO "btrfs: thread pool %d\n", | |
180 | info->thread_pool_size); | |
181 | } | |
182 | break; | |
c59f8951 | 183 | case Opt_max_extent: |
edf24abe CH |
184 | num = match_strdup(&args[0]); |
185 | if (num) { | |
186 | info->max_extent = btrfs_parse_size(num); | |
187 | kfree(num); | |
188 | ||
189 | info->max_extent = max_t(u64, | |
190 | info->max_extent, root->sectorsize); | |
191 | printk(KERN_INFO "btrfs: max_extent at %llu\n", | |
192 | info->max_extent); | |
c59f8951 CM |
193 | } |
194 | break; | |
6f568d35 | 195 | case Opt_max_inline: |
edf24abe CH |
196 | num = match_strdup(&args[0]); |
197 | if (num) { | |
198 | info->max_inline = btrfs_parse_size(num); | |
199 | kfree(num); | |
200 | ||
15ada040 CM |
201 | if (info->max_inline) { |
202 | info->max_inline = max_t(u64, | |
203 | info->max_inline, | |
204 | root->sectorsize); | |
205 | } | |
edf24abe CH |
206 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
207 | info->max_inline); | |
6f568d35 CM |
208 | } |
209 | break; | |
8f662a76 | 210 | case Opt_alloc_start: |
edf24abe CH |
211 | num = match_strdup(&args[0]); |
212 | if (num) { | |
213 | info->alloc_start = btrfs_parse_size(num); | |
214 | kfree(num); | |
215 | printk(KERN_INFO | |
216 | "btrfs: allocations start at %llu\n", | |
217 | info->alloc_start); | |
8f662a76 CM |
218 | } |
219 | break; | |
33268eaf JB |
220 | case Opt_noacl: |
221 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
222 | break; | |
95e05289 | 223 | default: |
be20aa9d | 224 | break; |
95e05289 CM |
225 | } |
226 | } | |
be20aa9d | 227 | kfree(options); |
edf24abe CH |
228 | return 0; |
229 | } | |
230 | ||
231 | /* | |
232 | * Parse mount options that are required early in the mount process. | |
233 | * | |
234 | * All other options will be parsed on much later in the mount process and | |
235 | * only when we need to allocate a new super block. | |
236 | */ | |
43e570b0 CH |
237 | static int btrfs_parse_early_options(const char *options, int flags, |
238 | void *holder, char **subvol_name, | |
239 | struct btrfs_fs_devices **fs_devices) | |
edf24abe CH |
240 | { |
241 | substring_t args[MAX_OPT_ARGS]; | |
242 | char *opts, *p; | |
243 | int error = 0; | |
244 | ||
245 | if (!options) | |
246 | goto out; | |
247 | ||
248 | /* | |
249 | * strsep changes the string, duplicate it because parse_options | |
250 | * gets called twice | |
251 | */ | |
252 | opts = kstrdup(options, GFP_KERNEL); | |
253 | if (!opts) | |
254 | return -ENOMEM; | |
255 | ||
256 | while ((p = strsep(&opts, ",")) != NULL) { | |
257 | int token; | |
258 | if (!*p) | |
259 | continue; | |
260 | ||
261 | token = match_token(p, tokens, args); | |
262 | switch (token) { | |
263 | case Opt_subvol: | |
264 | *subvol_name = match_strdup(&args[0]); | |
265 | break; | |
43e570b0 CH |
266 | case Opt_device: |
267 | error = btrfs_scan_one_device(match_strdup(&args[0]), | |
268 | flags, holder, fs_devices); | |
269 | if (error) | |
270 | goto out_free_opts; | |
271 | break; | |
edf24abe CH |
272 | default: |
273 | break; | |
274 | } | |
275 | } | |
276 | ||
43e570b0 | 277 | out_free_opts: |
edf24abe CH |
278 | kfree(opts); |
279 | out: | |
280 | /* | |
281 | * If no subvolume name is specified we use the default one. Allocate | |
282 | * a copy of the string "default" here so that code later in the | |
283 | * mount path doesn't care if it's the default volume or another one. | |
284 | */ | |
285 | if (!*subvol_name) { | |
286 | *subvol_name = kstrdup("default", GFP_KERNEL); | |
287 | if (!*subvol_name) | |
288 | return -ENOMEM; | |
289 | } | |
290 | return error; | |
95e05289 CM |
291 | } |
292 | ||
8a4b83cc CM |
293 | static int btrfs_fill_super(struct super_block * sb, |
294 | struct btrfs_fs_devices *fs_devices, | |
295 | void * data, int silent) | |
75dfe396 | 296 | { |
39279cc3 CM |
297 | struct inode * inode; |
298 | struct dentry * root_dentry; | |
299 | struct btrfs_super_block *disk_super; | |
300 | struct btrfs_root *tree_root; | |
301 | struct btrfs_inode *bi; | |
302 | int err; | |
a429e513 | 303 | |
39279cc3 CM |
304 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
305 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
306 | sb->s_op = &btrfs_super_ops; | |
be6e8dc0 | 307 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 308 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 309 | sb->s_time_gran = 1; |
33268eaf | 310 | sb->s_flags |= MS_POSIXACL; |
a429e513 | 311 | |
dfe25020 | 312 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
6567e837 | 313 | |
e58ca020 | 314 | if (IS_ERR(tree_root)) { |
39279cc3 | 315 | printk("btrfs: open_ctree failed\n"); |
e58ca020 | 316 | return PTR_ERR(tree_root); |
a429e513 | 317 | } |
39279cc3 | 318 | sb->s_fs_info = tree_root; |
5f39d397 | 319 | disk_super = &tree_root->fs_info->super_copy; |
39279cc3 CM |
320 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
321 | tree_root); | |
322 | bi = BTRFS_I(inode); | |
323 | bi->location.objectid = inode->i_ino; | |
324 | bi->location.offset = 0; | |
39279cc3 | 325 | bi->root = tree_root; |
b888db2b | 326 | |
39279cc3 | 327 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
a429e513 | 328 | |
39279cc3 | 329 | if (!inode) { |
6567e837 | 330 | err = -ENOMEM; |
39279cc3 | 331 | goto fail_close; |
f254e52c | 332 | } |
39279cc3 CM |
333 | if (inode->i_state & I_NEW) { |
334 | btrfs_read_locked_inode(inode); | |
335 | unlock_new_inode(inode); | |
f254e52c | 336 | } |
f254e52c | 337 | |
39279cc3 CM |
338 | root_dentry = d_alloc_root(inode); |
339 | if (!root_dentry) { | |
340 | iput(inode); | |
341 | err = -ENOMEM; | |
342 | goto fail_close; | |
f254e52c | 343 | } |
58176a96 JB |
344 | |
345 | /* this does the super kobj at the same time */ | |
346 | err = btrfs_sysfs_add_super(tree_root->fs_info); | |
347 | if (err) | |
348 | goto fail_close; | |
349 | ||
39279cc3 | 350 | sb->s_root = root_dentry; |
6885f308 | 351 | |
6885f308 | 352 | save_mount_options(sb, data); |
2619ba1f | 353 | return 0; |
39279cc3 CM |
354 | |
355 | fail_close: | |
356 | close_ctree(tree_root); | |
357 | return err; | |
2619ba1f CM |
358 | } |
359 | ||
6bf13c0c | 360 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
361 | { |
362 | struct btrfs_trans_handle *trans; | |
39279cc3 | 363 | struct btrfs_root *root; |
c5739bba | 364 | int ret; |
39279cc3 | 365 | root = btrfs_sb(sb); |
2619ba1f | 366 | |
39279cc3 CM |
367 | sb->s_dirt = 0; |
368 | if (!wait) { | |
369 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
370 | return 0; | |
371 | } | |
e9d0b13b | 372 | btrfs_clean_old_snapshots(root); |
c5739bba | 373 | trans = btrfs_start_transaction(root, 1); |
c5739bba | 374 | ret = btrfs_commit_transaction(trans, root); |
39279cc3 | 375 | sb->s_dirt = 0; |
54aa1f4d | 376 | return ret; |
2c90e5d6 CM |
377 | } |
378 | ||
39279cc3 | 379 | static void btrfs_write_super(struct super_block *sb) |
2c90e5d6 | 380 | { |
39279cc3 | 381 | sb->s_dirt = 0; |
2c90e5d6 CM |
382 | } |
383 | ||
a061fc8d | 384 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 385 | { |
a061fc8d CM |
386 | struct btrfs_fs_devices *test_fs_devices = data; |
387 | struct btrfs_root *root = btrfs_sb(s); | |
4b82d6e4 | 388 | |
a061fc8d | 389 | return root->fs_info->fs_devices == test_fs_devices; |
4b82d6e4 Y |
390 | } |
391 | ||
edf24abe CH |
392 | /* |
393 | * Find a superblock for the given device / mount point. | |
394 | * | |
395 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
396 | * for multiple device setup. Make sure to keep it in sync. | |
397 | */ | |
398 | static int btrfs_get_sb(struct file_system_type *fs_type, int flags, | |
399 | const char *dev_name, void *data, struct vfsmount *mnt) | |
4b82d6e4 | 400 | { |
edf24abe | 401 | char *subvol_name = NULL; |
4b82d6e4 Y |
402 | struct block_device *bdev = NULL; |
403 | struct super_block *s; | |
404 | struct dentry *root; | |
8a4b83cc | 405 | struct btrfs_fs_devices *fs_devices = NULL; |
4b82d6e4 Y |
406 | int error = 0; |
407 | ||
43e570b0 CH |
408 | error = btrfs_parse_early_options(data, flags, fs_type, |
409 | &subvol_name, &fs_devices); | |
edf24abe CH |
410 | if (error) |
411 | goto error; | |
412 | ||
8a4b83cc CM |
413 | error = btrfs_scan_one_device(dev_name, flags, fs_type, &fs_devices); |
414 | if (error) | |
edf24abe | 415 | goto error_free_subvol_name; |
4b82d6e4 | 416 | |
8a4b83cc CM |
417 | error = btrfs_open_devices(fs_devices, flags, fs_type); |
418 | if (error) | |
edf24abe | 419 | goto error_free_subvol_name; |
8a4b83cc | 420 | |
dfe25020 | 421 | bdev = fs_devices->latest_bdev; |
a061fc8d | 422 | s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); |
4b82d6e4 Y |
423 | if (IS_ERR(s)) |
424 | goto error_s; | |
425 | ||
426 | if (s->s_root) { | |
427 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
428 | up_write(&s->s_umount); | |
429 | deactivate_super(s); | |
430 | error = -EBUSY; | |
431 | goto error_bdev; | |
432 | } | |
433 | ||
4b82d6e4 Y |
434 | } else { |
435 | char b[BDEVNAME_SIZE]; | |
436 | ||
437 | s->s_flags = flags; | |
438 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); | |
8a4b83cc CM |
439 | error = btrfs_fill_super(s, fs_devices, data, |
440 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 Y |
441 | if (error) { |
442 | up_write(&s->s_umount); | |
443 | deactivate_super(s); | |
444 | goto error; | |
445 | } | |
446 | ||
788f20eb | 447 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
4b82d6e4 Y |
448 | s->s_flags |= MS_ACTIVE; |
449 | } | |
450 | ||
76fcef19 DW |
451 | if (!strcmp(subvol_name, ".")) |
452 | root = dget(s->s_root); | |
453 | else { | |
454 | mutex_lock(&s->s_root->d_inode->i_mutex); | |
455 | root = lookup_one_len(subvol_name, s->s_root, strlen(subvol_name)); | |
456 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
457 | if (IS_ERR(root)) { | |
458 | up_write(&s->s_umount); | |
459 | deactivate_super(s); | |
460 | error = PTR_ERR(root); | |
461 | goto error; | |
462 | } | |
463 | if (!root->d_inode) { | |
464 | dput(root); | |
465 | up_write(&s->s_umount); | |
466 | deactivate_super(s); | |
467 | error = -ENXIO; | |
468 | goto error; | |
469 | } | |
4b82d6e4 Y |
470 | } |
471 | ||
472 | mnt->mnt_sb = s; | |
473 | mnt->mnt_root = root; | |
edf24abe CH |
474 | |
475 | kfree(subvol_name); | |
4b82d6e4 Y |
476 | return 0; |
477 | ||
478 | error_s: | |
479 | error = PTR_ERR(s); | |
480 | error_bdev: | |
8a4b83cc | 481 | btrfs_close_devices(fs_devices); |
edf24abe CH |
482 | error_free_subvol_name: |
483 | kfree(subvol_name); | |
4b82d6e4 Y |
484 | error: |
485 | return error; | |
486 | } | |
2e635a27 | 487 | |
8fd17795 CM |
488 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
489 | { | |
490 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 491 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
db94535d | 492 | int bits = dentry->d_sb->s_blocksize_bits; |
9d03632e | 493 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
8fd17795 CM |
494 | |
495 | buf->f_namelen = BTRFS_NAME_LEN; | |
db94535d CM |
496 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
497 | buf->f_bfree = buf->f_blocks - | |
498 | (btrfs_super_bytes_used(disk_super) >> bits); | |
8fd17795 CM |
499 | buf->f_bavail = buf->f_bfree; |
500 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
501 | buf->f_type = BTRFS_SUPER_MAGIC; | |
9d03632e DW |
502 | /* We treat it as constant endianness (it doesn't matter _which_) |
503 | because we want the fsid to come out the same whether mounted | |
504 | on a big-endian or little-endian host */ | |
505 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
506 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
507 | /* Mask in the root object ID too, to disambiguate subvols */ |
508 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
509 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
510 | ||
8fd17795 CM |
511 | return 0; |
512 | } | |
b5133862 | 513 | |
2e635a27 CM |
514 | static struct file_system_type btrfs_fs_type = { |
515 | .owner = THIS_MODULE, | |
516 | .name = "btrfs", | |
517 | .get_sb = btrfs_get_sb, | |
a061fc8d | 518 | .kill_sb = kill_anon_super, |
2e635a27 CM |
519 | .fs_flags = FS_REQUIRES_DEV, |
520 | }; | |
a9218f6b | 521 | |
d352ac68 CM |
522 | /* |
523 | * used by btrfsctl to scan devices when no FS is mounted | |
524 | */ | |
8a4b83cc CM |
525 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
526 | unsigned long arg) | |
527 | { | |
528 | struct btrfs_ioctl_vol_args *vol; | |
529 | struct btrfs_fs_devices *fs_devices; | |
f819d837 | 530 | int ret = 0; |
8a4b83cc CM |
531 | int len; |
532 | ||
533 | vol = kmalloc(sizeof(*vol), GFP_KERNEL); | |
534 | if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) { | |
535 | ret = -EFAULT; | |
536 | goto out; | |
537 | } | |
538 | len = strnlen(vol->name, BTRFS_PATH_NAME_MAX); | |
539 | switch (cmd) { | |
540 | case BTRFS_IOC_SCAN_DEV: | |
541 | ret = btrfs_scan_one_device(vol->name, MS_RDONLY, | |
542 | &btrfs_fs_type, &fs_devices); | |
543 | break; | |
544 | } | |
545 | out: | |
546 | kfree(vol); | |
f819d837 | 547 | return ret; |
8a4b83cc CM |
548 | } |
549 | ||
ed0dab6b Y |
550 | static void btrfs_write_super_lockfs(struct super_block *sb) |
551 | { | |
552 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
553 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
554 | mutex_lock(&root->fs_info->cleaner_mutex); | |
ed0dab6b Y |
555 | } |
556 | ||
557 | static void btrfs_unlockfs(struct super_block *sb) | |
558 | { | |
559 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
560 | mutex_unlock(&root->fs_info->cleaner_mutex); |
561 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
ed0dab6b | 562 | } |
2e635a27 | 563 | |
e20d96d6 | 564 | static struct super_operations btrfs_super_ops = { |
134e9731 | 565 | .delete_inode = btrfs_delete_inode, |
e20d96d6 | 566 | .put_super = btrfs_put_super, |
d5719762 CM |
567 | .write_super = btrfs_write_super, |
568 | .sync_fs = btrfs_sync_fs, | |
6885f308 | 569 | .show_options = generic_show_options, |
4730a4bc | 570 | .write_inode = btrfs_write_inode, |
b5133862 | 571 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
572 | .alloc_inode = btrfs_alloc_inode, |
573 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 574 | .statfs = btrfs_statfs, |
ed0dab6b Y |
575 | .write_super_lockfs = btrfs_write_super_lockfs, |
576 | .unlockfs = btrfs_unlockfs, | |
e20d96d6 | 577 | }; |
a9218f6b CM |
578 | |
579 | static const struct file_operations btrfs_ctl_fops = { | |
580 | .unlocked_ioctl = btrfs_control_ioctl, | |
581 | .compat_ioctl = btrfs_control_ioctl, | |
582 | .owner = THIS_MODULE, | |
583 | }; | |
584 | ||
585 | static struct miscdevice btrfs_misc = { | |
586 | .minor = MISC_DYNAMIC_MINOR, | |
587 | .name = "btrfs-control", | |
588 | .fops = &btrfs_ctl_fops | |
589 | }; | |
590 | ||
591 | static int btrfs_interface_init(void) | |
592 | { | |
593 | return misc_register(&btrfs_misc); | |
594 | } | |
595 | ||
596 | void btrfs_interface_exit(void) | |
597 | { | |
598 | if (misc_deregister(&btrfs_misc) < 0) | |
599 | printk("misc_deregister failed for control device"); | |
600 | } | |
601 | ||
2e635a27 CM |
602 | static int __init init_btrfs_fs(void) |
603 | { | |
2c90e5d6 | 604 | int err; |
58176a96 JB |
605 | |
606 | err = btrfs_init_sysfs(); | |
607 | if (err) | |
608 | return err; | |
609 | ||
39279cc3 | 610 | err = btrfs_init_cachep(); |
2c90e5d6 | 611 | if (err) |
a74a4b97 | 612 | goto free_sysfs; |
d1310b2e CM |
613 | |
614 | err = extent_io_init(); | |
2f4cbe64 WB |
615 | if (err) |
616 | goto free_cachep; | |
617 | ||
d1310b2e CM |
618 | err = extent_map_init(); |
619 | if (err) | |
620 | goto free_extent_io; | |
621 | ||
a9218f6b | 622 | err = btrfs_interface_init(); |
2f4cbe64 WB |
623 | if (err) |
624 | goto free_extent_map; | |
a9218f6b CM |
625 | err = register_filesystem(&btrfs_fs_type); |
626 | if (err) | |
627 | goto unregister_ioctl; | |
b3c3da71 CM |
628 | |
629 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); | |
2f4cbe64 WB |
630 | return 0; |
631 | ||
a9218f6b CM |
632 | unregister_ioctl: |
633 | btrfs_interface_exit(); | |
2f4cbe64 WB |
634 | free_extent_map: |
635 | extent_map_exit(); | |
d1310b2e CM |
636 | free_extent_io: |
637 | extent_io_exit(); | |
2f4cbe64 WB |
638 | free_cachep: |
639 | btrfs_destroy_cachep(); | |
a74a4b97 | 640 | free_sysfs: |
2f4cbe64 WB |
641 | btrfs_exit_sysfs(); |
642 | return err; | |
2e635a27 CM |
643 | } |
644 | ||
645 | static void __exit exit_btrfs_fs(void) | |
646 | { | |
39279cc3 | 647 | btrfs_destroy_cachep(); |
a52d9a80 | 648 | extent_map_exit(); |
d1310b2e | 649 | extent_io_exit(); |
a9218f6b | 650 | btrfs_interface_exit(); |
2e635a27 | 651 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 652 | btrfs_exit_sysfs(); |
8a4b83cc | 653 | btrfs_cleanup_fs_uuids(); |
2e635a27 CM |
654 | } |
655 | ||
656 | module_init(init_btrfs_fs) | |
657 | module_exit(exit_btrfs_fs) | |
658 | ||
659 | MODULE_LICENSE("GPL"); |