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" |
c8b97818 | 50 | #include "compression.h" |
2e635a27 | 51 | |
5f39d397 | 52 | #define BTRFS_SUPER_MAGIC 0x9123683E |
f254e52c | 53 | |
39279cc3 | 54 | static struct super_operations btrfs_super_ops; |
75dfe396 | 55 | |
39279cc3 | 56 | static void btrfs_put_super (struct super_block * sb) |
b18c6685 | 57 | { |
39279cc3 | 58 | struct btrfs_root *root = btrfs_sb(sb); |
58176a96 | 59 | struct btrfs_fs_info *fs = root->fs_info; |
b18c6685 | 60 | int ret; |
b18c6685 | 61 | |
39279cc3 CM |
62 | ret = close_ctree(root); |
63 | if (ret) { | |
64 | printk("close ctree returns %d\n", ret); | |
75dfe396 | 65 | } |
58176a96 | 66 | btrfs_sysfs_del_super(fs); |
39279cc3 | 67 | sb->s_fs_info = NULL; |
75dfe396 CM |
68 | } |
69 | ||
95e05289 | 70 | enum { |
43e570b0 | 71 | Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow, |
dfe25020 | 72 | Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, |
c8b97818 | 73 | Opt_ssd, Opt_thread_pool, Opt_noacl, Opt_compress, Opt_err, |
95e05289 CM |
74 | }; |
75 | ||
76 | static match_table_t tokens = { | |
dfe25020 | 77 | {Opt_degraded, "degraded"}, |
95e05289 | 78 | {Opt_subvol, "subvol=%s"}, |
43e570b0 | 79 | {Opt_device, "device=%s"}, |
b6cda9bc | 80 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 81 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 82 | {Opt_nobarrier, "nobarrier"}, |
c59f8951 | 83 | {Opt_max_extent, "max_extent=%s"}, |
6f568d35 | 84 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 85 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 86 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 87 | {Opt_compress, "compress"}, |
e18e4809 | 88 | {Opt_ssd, "ssd"}, |
33268eaf JB |
89 | {Opt_noacl, "noacl"}, |
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; | |
95e05289 | 229 | default: |
be20aa9d | 230 | break; |
95e05289 CM |
231 | } |
232 | } | |
be20aa9d | 233 | kfree(options); |
edf24abe CH |
234 | return 0; |
235 | } | |
236 | ||
237 | /* | |
238 | * Parse mount options that are required early in the mount process. | |
239 | * | |
240 | * All other options will be parsed on much later in the mount process and | |
241 | * only when we need to allocate a new super block. | |
242 | */ | |
43e570b0 CH |
243 | static int btrfs_parse_early_options(const char *options, int flags, |
244 | void *holder, char **subvol_name, | |
245 | struct btrfs_fs_devices **fs_devices) | |
edf24abe CH |
246 | { |
247 | substring_t args[MAX_OPT_ARGS]; | |
248 | char *opts, *p; | |
249 | int error = 0; | |
250 | ||
251 | if (!options) | |
252 | goto out; | |
253 | ||
254 | /* | |
255 | * strsep changes the string, duplicate it because parse_options | |
256 | * gets called twice | |
257 | */ | |
258 | opts = kstrdup(options, GFP_KERNEL); | |
259 | if (!opts) | |
260 | return -ENOMEM; | |
261 | ||
262 | while ((p = strsep(&opts, ",")) != NULL) { | |
263 | int token; | |
264 | if (!*p) | |
265 | continue; | |
266 | ||
267 | token = match_token(p, tokens, args); | |
268 | switch (token) { | |
269 | case Opt_subvol: | |
270 | *subvol_name = match_strdup(&args[0]); | |
271 | break; | |
43e570b0 CH |
272 | case Opt_device: |
273 | error = btrfs_scan_one_device(match_strdup(&args[0]), | |
274 | flags, holder, fs_devices); | |
275 | if (error) | |
276 | goto out_free_opts; | |
277 | break; | |
edf24abe CH |
278 | default: |
279 | break; | |
280 | } | |
281 | } | |
282 | ||
43e570b0 | 283 | out_free_opts: |
edf24abe CH |
284 | kfree(opts); |
285 | out: | |
286 | /* | |
287 | * If no subvolume name is specified we use the default one. Allocate | |
288 | * a copy of the string "default" here so that code later in the | |
289 | * mount path doesn't care if it's the default volume or another one. | |
290 | */ | |
291 | if (!*subvol_name) { | |
292 | *subvol_name = kstrdup("default", GFP_KERNEL); | |
293 | if (!*subvol_name) | |
294 | return -ENOMEM; | |
295 | } | |
296 | return error; | |
95e05289 CM |
297 | } |
298 | ||
8a4b83cc CM |
299 | static int btrfs_fill_super(struct super_block * sb, |
300 | struct btrfs_fs_devices *fs_devices, | |
301 | void * data, int silent) | |
75dfe396 | 302 | { |
39279cc3 CM |
303 | struct inode * inode; |
304 | struct dentry * root_dentry; | |
305 | struct btrfs_super_block *disk_super; | |
306 | struct btrfs_root *tree_root; | |
307 | struct btrfs_inode *bi; | |
308 | int err; | |
a429e513 | 309 | |
39279cc3 CM |
310 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
311 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
312 | sb->s_op = &btrfs_super_ops; | |
be6e8dc0 | 313 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 314 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 315 | sb->s_time_gran = 1; |
33268eaf | 316 | sb->s_flags |= MS_POSIXACL; |
a429e513 | 317 | |
dfe25020 | 318 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
6567e837 | 319 | |
e58ca020 | 320 | if (IS_ERR(tree_root)) { |
39279cc3 | 321 | printk("btrfs: open_ctree failed\n"); |
e58ca020 | 322 | return PTR_ERR(tree_root); |
a429e513 | 323 | } |
39279cc3 | 324 | sb->s_fs_info = tree_root; |
5f39d397 | 325 | disk_super = &tree_root->fs_info->super_copy; |
39279cc3 CM |
326 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
327 | tree_root); | |
328 | bi = BTRFS_I(inode); | |
329 | bi->location.objectid = inode->i_ino; | |
330 | bi->location.offset = 0; | |
39279cc3 | 331 | bi->root = tree_root; |
b888db2b | 332 | |
39279cc3 | 333 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
a429e513 | 334 | |
39279cc3 | 335 | if (!inode) { |
6567e837 | 336 | err = -ENOMEM; |
39279cc3 | 337 | goto fail_close; |
f254e52c | 338 | } |
39279cc3 CM |
339 | if (inode->i_state & I_NEW) { |
340 | btrfs_read_locked_inode(inode); | |
341 | unlock_new_inode(inode); | |
f254e52c | 342 | } |
f254e52c | 343 | |
39279cc3 CM |
344 | root_dentry = d_alloc_root(inode); |
345 | if (!root_dentry) { | |
346 | iput(inode); | |
347 | err = -ENOMEM; | |
348 | goto fail_close; | |
f254e52c | 349 | } |
58176a96 JB |
350 | |
351 | /* this does the super kobj at the same time */ | |
352 | err = btrfs_sysfs_add_super(tree_root->fs_info); | |
353 | if (err) | |
354 | goto fail_close; | |
355 | ||
39279cc3 | 356 | sb->s_root = root_dentry; |
6885f308 | 357 | |
6885f308 | 358 | save_mount_options(sb, data); |
2619ba1f | 359 | return 0; |
39279cc3 CM |
360 | |
361 | fail_close: | |
362 | close_ctree(tree_root); | |
363 | return err; | |
2619ba1f CM |
364 | } |
365 | ||
6bf13c0c | 366 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
367 | { |
368 | struct btrfs_trans_handle *trans; | |
39279cc3 | 369 | struct btrfs_root *root; |
c5739bba | 370 | int ret; |
39279cc3 | 371 | root = btrfs_sb(sb); |
2619ba1f | 372 | |
c146afad YZ |
373 | if (sb->s_flags & MS_RDONLY) |
374 | return 0; | |
375 | ||
39279cc3 CM |
376 | sb->s_dirt = 0; |
377 | if (!wait) { | |
378 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
379 | return 0; | |
380 | } | |
771ed689 CM |
381 | |
382 | btrfs_start_delalloc_inodes(root); | |
383 | btrfs_wait_ordered_extents(root, 0); | |
384 | ||
e9d0b13b | 385 | btrfs_clean_old_snapshots(root); |
c5739bba | 386 | trans = btrfs_start_transaction(root, 1); |
c5739bba | 387 | ret = btrfs_commit_transaction(trans, root); |
39279cc3 | 388 | sb->s_dirt = 0; |
54aa1f4d | 389 | return ret; |
2c90e5d6 CM |
390 | } |
391 | ||
39279cc3 | 392 | static void btrfs_write_super(struct super_block *sb) |
2c90e5d6 | 393 | { |
39279cc3 | 394 | sb->s_dirt = 0; |
2c90e5d6 CM |
395 | } |
396 | ||
a061fc8d | 397 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 398 | { |
a061fc8d CM |
399 | struct btrfs_fs_devices *test_fs_devices = data; |
400 | struct btrfs_root *root = btrfs_sb(s); | |
4b82d6e4 | 401 | |
a061fc8d | 402 | return root->fs_info->fs_devices == test_fs_devices; |
4b82d6e4 Y |
403 | } |
404 | ||
edf24abe CH |
405 | /* |
406 | * Find a superblock for the given device / mount point. | |
407 | * | |
408 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
409 | * for multiple device setup. Make sure to keep it in sync. | |
410 | */ | |
411 | static int btrfs_get_sb(struct file_system_type *fs_type, int flags, | |
412 | const char *dev_name, void *data, struct vfsmount *mnt) | |
4b82d6e4 | 413 | { |
edf24abe | 414 | char *subvol_name = NULL; |
4b82d6e4 Y |
415 | struct block_device *bdev = NULL; |
416 | struct super_block *s; | |
417 | struct dentry *root; | |
8a4b83cc | 418 | struct btrfs_fs_devices *fs_devices = NULL; |
4b82d6e4 Y |
419 | int error = 0; |
420 | ||
43e570b0 CH |
421 | error = btrfs_parse_early_options(data, flags, fs_type, |
422 | &subvol_name, &fs_devices); | |
edf24abe CH |
423 | if (error) |
424 | goto error; | |
425 | ||
8a4b83cc CM |
426 | error = btrfs_scan_one_device(dev_name, flags, fs_type, &fs_devices); |
427 | if (error) | |
edf24abe | 428 | goto error_free_subvol_name; |
4b82d6e4 | 429 | |
8a4b83cc CM |
430 | error = btrfs_open_devices(fs_devices, flags, fs_type); |
431 | if (error) | |
edf24abe | 432 | goto error_free_subvol_name; |
8a4b83cc | 433 | |
dfe25020 | 434 | bdev = fs_devices->latest_bdev; |
a061fc8d | 435 | s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); |
4b82d6e4 Y |
436 | if (IS_ERR(s)) |
437 | goto error_s; | |
438 | ||
439 | if (s->s_root) { | |
440 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
441 | up_write(&s->s_umount); | |
442 | deactivate_super(s); | |
443 | error = -EBUSY; | |
c146afad | 444 | goto error_close_devices; |
4b82d6e4 Y |
445 | } |
446 | ||
4b82d6e4 Y |
447 | } else { |
448 | char b[BDEVNAME_SIZE]; | |
449 | ||
450 | s->s_flags = flags; | |
451 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); | |
8a4b83cc CM |
452 | error = btrfs_fill_super(s, fs_devices, data, |
453 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 Y |
454 | if (error) { |
455 | up_write(&s->s_umount); | |
456 | deactivate_super(s); | |
457 | goto error; | |
458 | } | |
459 | ||
788f20eb | 460 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
4b82d6e4 Y |
461 | s->s_flags |= MS_ACTIVE; |
462 | } | |
463 | ||
76fcef19 DW |
464 | if (!strcmp(subvol_name, ".")) |
465 | root = dget(s->s_root); | |
466 | else { | |
467 | mutex_lock(&s->s_root->d_inode->i_mutex); | |
468 | root = lookup_one_len(subvol_name, s->s_root, strlen(subvol_name)); | |
469 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
470 | if (IS_ERR(root)) { | |
471 | up_write(&s->s_umount); | |
472 | deactivate_super(s); | |
473 | error = PTR_ERR(root); | |
474 | goto error; | |
475 | } | |
476 | if (!root->d_inode) { | |
477 | dput(root); | |
478 | up_write(&s->s_umount); | |
479 | deactivate_super(s); | |
480 | error = -ENXIO; | |
481 | goto error; | |
482 | } | |
4b82d6e4 Y |
483 | } |
484 | ||
485 | mnt->mnt_sb = s; | |
486 | mnt->mnt_root = root; | |
edf24abe CH |
487 | |
488 | kfree(subvol_name); | |
4b82d6e4 Y |
489 | return 0; |
490 | ||
491 | error_s: | |
492 | error = PTR_ERR(s); | |
c146afad | 493 | error_close_devices: |
8a4b83cc | 494 | btrfs_close_devices(fs_devices); |
edf24abe CH |
495 | error_free_subvol_name: |
496 | kfree(subvol_name); | |
4b82d6e4 Y |
497 | error: |
498 | return error; | |
499 | } | |
2e635a27 | 500 | |
c146afad YZ |
501 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
502 | { | |
503 | struct btrfs_root *root = btrfs_sb(sb); | |
504 | int ret; | |
505 | ||
506 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) | |
507 | return 0; | |
508 | ||
509 | if (*flags & MS_RDONLY) { | |
510 | sb->s_flags |= MS_RDONLY; | |
511 | ||
512 | ret = btrfs_commit_super(root); | |
513 | WARN_ON(ret); | |
514 | } else { | |
515 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) | |
516 | return -EINVAL; | |
517 | ||
518 | ret = btrfs_cleanup_reloc_trees(root); | |
519 | WARN_ON(ret); | |
520 | ||
521 | ret = btrfs_cleanup_fs_roots(root->fs_info); | |
522 | WARN_ON(ret); | |
523 | ||
524 | sb->s_flags &= ~MS_RDONLY; | |
525 | } | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
8fd17795 CM |
530 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
531 | { | |
532 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 533 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
db94535d | 534 | int bits = dentry->d_sb->s_blocksize_bits; |
9d03632e | 535 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
8fd17795 CM |
536 | |
537 | buf->f_namelen = BTRFS_NAME_LEN; | |
db94535d CM |
538 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
539 | buf->f_bfree = buf->f_blocks - | |
540 | (btrfs_super_bytes_used(disk_super) >> bits); | |
8fd17795 CM |
541 | buf->f_bavail = buf->f_bfree; |
542 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
543 | buf->f_type = BTRFS_SUPER_MAGIC; | |
9d03632e DW |
544 | /* We treat it as constant endianness (it doesn't matter _which_) |
545 | because we want the fsid to come out the same whether mounted | |
546 | on a big-endian or little-endian host */ | |
547 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
548 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
549 | /* Mask in the root object ID too, to disambiguate subvols */ |
550 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
551 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
552 | ||
8fd17795 CM |
553 | return 0; |
554 | } | |
b5133862 | 555 | |
2e635a27 CM |
556 | static struct file_system_type btrfs_fs_type = { |
557 | .owner = THIS_MODULE, | |
558 | .name = "btrfs", | |
559 | .get_sb = btrfs_get_sb, | |
a061fc8d | 560 | .kill_sb = kill_anon_super, |
2e635a27 CM |
561 | .fs_flags = FS_REQUIRES_DEV, |
562 | }; | |
a9218f6b | 563 | |
d352ac68 CM |
564 | /* |
565 | * used by btrfsctl to scan devices when no FS is mounted | |
566 | */ | |
8a4b83cc CM |
567 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
568 | unsigned long arg) | |
569 | { | |
570 | struct btrfs_ioctl_vol_args *vol; | |
571 | struct btrfs_fs_devices *fs_devices; | |
f819d837 | 572 | int ret = 0; |
8a4b83cc CM |
573 | int len; |
574 | ||
575 | vol = kmalloc(sizeof(*vol), GFP_KERNEL); | |
576 | if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) { | |
577 | ret = -EFAULT; | |
578 | goto out; | |
579 | } | |
580 | len = strnlen(vol->name, BTRFS_PATH_NAME_MAX); | |
581 | switch (cmd) { | |
582 | case BTRFS_IOC_SCAN_DEV: | |
583 | ret = btrfs_scan_one_device(vol->name, MS_RDONLY, | |
584 | &btrfs_fs_type, &fs_devices); | |
585 | break; | |
586 | } | |
587 | out: | |
588 | kfree(vol); | |
f819d837 | 589 | return ret; |
8a4b83cc CM |
590 | } |
591 | ||
ed0dab6b Y |
592 | static void btrfs_write_super_lockfs(struct super_block *sb) |
593 | { | |
594 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
595 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
596 | mutex_lock(&root->fs_info->cleaner_mutex); | |
ed0dab6b Y |
597 | } |
598 | ||
599 | static void btrfs_unlockfs(struct super_block *sb) | |
600 | { | |
601 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
602 | mutex_unlock(&root->fs_info->cleaner_mutex); |
603 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
ed0dab6b | 604 | } |
2e635a27 | 605 | |
e20d96d6 | 606 | static struct super_operations btrfs_super_ops = { |
134e9731 | 607 | .delete_inode = btrfs_delete_inode, |
e20d96d6 | 608 | .put_super = btrfs_put_super, |
d5719762 CM |
609 | .write_super = btrfs_write_super, |
610 | .sync_fs = btrfs_sync_fs, | |
6885f308 | 611 | .show_options = generic_show_options, |
4730a4bc | 612 | .write_inode = btrfs_write_inode, |
b5133862 | 613 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
614 | .alloc_inode = btrfs_alloc_inode, |
615 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 616 | .statfs = btrfs_statfs, |
c146afad | 617 | .remount_fs = btrfs_remount, |
ed0dab6b Y |
618 | .write_super_lockfs = btrfs_write_super_lockfs, |
619 | .unlockfs = btrfs_unlockfs, | |
e20d96d6 | 620 | }; |
a9218f6b CM |
621 | |
622 | static const struct file_operations btrfs_ctl_fops = { | |
623 | .unlocked_ioctl = btrfs_control_ioctl, | |
624 | .compat_ioctl = btrfs_control_ioctl, | |
625 | .owner = THIS_MODULE, | |
626 | }; | |
627 | ||
628 | static struct miscdevice btrfs_misc = { | |
629 | .minor = MISC_DYNAMIC_MINOR, | |
630 | .name = "btrfs-control", | |
631 | .fops = &btrfs_ctl_fops | |
632 | }; | |
633 | ||
634 | static int btrfs_interface_init(void) | |
635 | { | |
636 | return misc_register(&btrfs_misc); | |
637 | } | |
638 | ||
639 | void btrfs_interface_exit(void) | |
640 | { | |
641 | if (misc_deregister(&btrfs_misc) < 0) | |
642 | printk("misc_deregister failed for control device"); | |
643 | } | |
644 | ||
2e635a27 CM |
645 | static int __init init_btrfs_fs(void) |
646 | { | |
2c90e5d6 | 647 | int err; |
58176a96 JB |
648 | |
649 | err = btrfs_init_sysfs(); | |
650 | if (err) | |
651 | return err; | |
652 | ||
39279cc3 | 653 | err = btrfs_init_cachep(); |
2c90e5d6 | 654 | if (err) |
a74a4b97 | 655 | goto free_sysfs; |
d1310b2e CM |
656 | |
657 | err = extent_io_init(); | |
2f4cbe64 WB |
658 | if (err) |
659 | goto free_cachep; | |
660 | ||
d1310b2e CM |
661 | err = extent_map_init(); |
662 | if (err) | |
663 | goto free_extent_io; | |
664 | ||
a9218f6b | 665 | err = btrfs_interface_init(); |
2f4cbe64 WB |
666 | if (err) |
667 | goto free_extent_map; | |
c8b97818 | 668 | |
a9218f6b CM |
669 | err = register_filesystem(&btrfs_fs_type); |
670 | if (err) | |
671 | goto unregister_ioctl; | |
b3c3da71 CM |
672 | |
673 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); | |
2f4cbe64 WB |
674 | return 0; |
675 | ||
a9218f6b CM |
676 | unregister_ioctl: |
677 | btrfs_interface_exit(); | |
2f4cbe64 WB |
678 | free_extent_map: |
679 | extent_map_exit(); | |
d1310b2e CM |
680 | free_extent_io: |
681 | extent_io_exit(); | |
2f4cbe64 WB |
682 | free_cachep: |
683 | btrfs_destroy_cachep(); | |
a74a4b97 | 684 | free_sysfs: |
2f4cbe64 WB |
685 | btrfs_exit_sysfs(); |
686 | return err; | |
2e635a27 CM |
687 | } |
688 | ||
689 | static void __exit exit_btrfs_fs(void) | |
690 | { | |
39279cc3 | 691 | btrfs_destroy_cachep(); |
a52d9a80 | 692 | extent_map_exit(); |
d1310b2e | 693 | extent_io_exit(); |
a9218f6b | 694 | btrfs_interface_exit(); |
2e635a27 | 695 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 696 | btrfs_exit_sysfs(); |
8a4b83cc | 697 | btrfs_cleanup_fs_uuids(); |
c8b97818 | 698 | btrfs_zlib_exit(); |
2e635a27 CM |
699 | } |
700 | ||
701 | module_init(init_btrfs_fs) | |
702 | module_exit(exit_btrfs_fs) | |
703 | ||
704 | MODULE_LICENSE("GPL"); |