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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> |
2e635a27 | 39 | #include "ctree.h" |
e20d96d6 | 40 | #include "disk-io.h" |
d5719762 | 41 | #include "transaction.h" |
2c90e5d6 | 42 | #include "btrfs_inode.h" |
c5739bba | 43 | #include "ioctl.h" |
3a686375 | 44 | #include "print-tree.h" |
5103e947 | 45 | #include "xattr.h" |
2e635a27 | 46 | |
5f39d397 | 47 | #define BTRFS_SUPER_MAGIC 0x9123683E |
f254e52c | 48 | |
39279cc3 | 49 | static struct super_operations btrfs_super_ops; |
75dfe396 | 50 | |
39279cc3 | 51 | static void btrfs_put_super (struct super_block * sb) |
b18c6685 | 52 | { |
39279cc3 | 53 | struct btrfs_root *root = btrfs_sb(sb); |
58176a96 | 54 | struct btrfs_fs_info *fs = root->fs_info; |
b18c6685 | 55 | int ret; |
b18c6685 | 56 | |
39279cc3 CM |
57 | ret = close_ctree(root); |
58 | if (ret) { | |
59 | printk("close ctree returns %d\n", ret); | |
75dfe396 | 60 | } |
58176a96 | 61 | btrfs_sysfs_del_super(fs); |
39279cc3 | 62 | sb->s_fs_info = NULL; |
75dfe396 CM |
63 | } |
64 | ||
95e05289 | 65 | enum { |
8f662a76 | 66 | Opt_subvol, Opt_nodatasum, Opt_nodatacow, Opt_max_extent, |
6f568d35 | 67 | Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, Opt_err, |
95e05289 CM |
68 | }; |
69 | ||
70 | static match_table_t tokens = { | |
71 | {Opt_subvol, "subvol=%s"}, | |
b6cda9bc | 72 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 73 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 74 | {Opt_nobarrier, "nobarrier"}, |
c59f8951 | 75 | {Opt_max_extent, "max_extent=%s"}, |
6f568d35 | 76 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 77 | {Opt_alloc_start, "alloc_start=%s"}, |
e18e4809 | 78 | {Opt_ssd, "ssd"}, |
95e05289 CM |
79 | {Opt_err, NULL} |
80 | }; | |
81 | ||
edbd8d4e | 82 | u64 btrfs_parse_size(char *str) |
c59f8951 | 83 | { |
edbd8d4e | 84 | u64 res; |
c59f8951 CM |
85 | int mult = 1; |
86 | char *end; | |
87 | char last; | |
88 | ||
89 | res = simple_strtoul(str, &end, 10); | |
90 | ||
91 | last = end[0]; | |
92 | if (isalpha(last)) { | |
93 | last = tolower(last); | |
94 | switch (last) { | |
95 | case 'g': | |
96 | mult *= 1024; | |
97 | case 'm': | |
98 | mult *= 1024; | |
99 | case 'k': | |
100 | mult *= 1024; | |
101 | } | |
102 | res = res * mult; | |
103 | } | |
104 | return res; | |
105 | } | |
106 | ||
95e05289 CM |
107 | static int parse_options (char * options, |
108 | struct btrfs_root *root, | |
109 | char **subvol_name) | |
110 | { | |
111 | char * p; | |
b6cda9bc | 112 | struct btrfs_fs_info *info = NULL; |
95e05289 | 113 | substring_t args[MAX_OPT_ARGS]; |
b6cda9bc | 114 | |
95e05289 CM |
115 | if (!options) |
116 | return 1; | |
117 | ||
be20aa9d CM |
118 | /* |
119 | * strsep changes the string, duplicate it because parse_options | |
120 | * gets called twice | |
121 | */ | |
122 | options = kstrdup(options, GFP_NOFS); | |
123 | if (!options) | |
124 | return -ENOMEM; | |
125 | ||
126 | if (root) | |
127 | info = root->fs_info; | |
128 | ||
95e05289 CM |
129 | while ((p = strsep (&options, ",")) != NULL) { |
130 | int token; | |
131 | if (!*p) | |
132 | continue; | |
133 | ||
134 | token = match_token(p, tokens, args); | |
135 | switch (token) { | |
136 | case Opt_subvol: | |
be20aa9d | 137 | if (subvol_name) { |
b6cda9bc | 138 | *subvol_name = match_strdup(&args[0]); |
be20aa9d | 139 | } |
b6cda9bc CM |
140 | break; |
141 | case Opt_nodatasum: | |
be20aa9d CM |
142 | if (info) { |
143 | printk("btrfs: setting nodatacsum\n"); | |
b6cda9bc | 144 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
145 | } |
146 | break; | |
147 | case Opt_nodatacow: | |
148 | if (info) { | |
149 | printk("btrfs: setting nodatacow\n"); | |
150 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
151 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
152 | } | |
95e05289 | 153 | break; |
e18e4809 CM |
154 | case Opt_ssd: |
155 | if (info) { | |
156 | printk("btrfs: use ssd allocation scheme\n"); | |
157 | btrfs_set_opt(info->mount_opt, SSD); | |
158 | } | |
159 | break; | |
21ad10cf CM |
160 | case Opt_nobarrier: |
161 | if (info) { | |
162 | printk("btrfs: turning off barriers\n"); | |
163 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
164 | } | |
165 | break; | |
c59f8951 CM |
166 | case Opt_max_extent: |
167 | if (info) { | |
168 | char *num = match_strdup(&args[0]); | |
169 | if (num) { | |
edbd8d4e CM |
170 | info->max_extent = |
171 | btrfs_parse_size(num); | |
c59f8951 CM |
172 | kfree(num); |
173 | ||
174 | info->max_extent = max_t(u64, | |
175 | info->max_extent, | |
176 | root->sectorsize); | |
177 | printk("btrfs: max_extent at %Lu\n", | |
178 | info->max_extent); | |
179 | } | |
180 | } | |
181 | break; | |
6f568d35 CM |
182 | case Opt_max_inline: |
183 | if (info) { | |
184 | char *num = match_strdup(&args[0]); | |
185 | if (num) { | |
186 | info->max_inline = | |
187 | btrfs_parse_size(num); | |
188 | kfree(num); | |
189 | ||
190 | info->max_inline = max_t(u64, | |
191 | info->max_inline, | |
192 | root->sectorsize); | |
193 | printk("btrfs: max_inline at %Lu\n", | |
194 | info->max_inline); | |
195 | } | |
196 | } | |
197 | break; | |
8f662a76 CM |
198 | case Opt_alloc_start: |
199 | if (info) { | |
200 | char *num = match_strdup(&args[0]); | |
201 | if (num) { | |
202 | info->alloc_start = | |
203 | btrfs_parse_size(num); | |
204 | kfree(num); | |
205 | printk("btrfs: allocations start at " | |
206 | "%Lu\n", info->alloc_start); | |
207 | } | |
208 | } | |
209 | break; | |
95e05289 | 210 | default: |
be20aa9d | 211 | break; |
95e05289 CM |
212 | } |
213 | } | |
be20aa9d | 214 | kfree(options); |
95e05289 CM |
215 | return 1; |
216 | } | |
217 | ||
39279cc3 | 218 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) |
75dfe396 | 219 | { |
39279cc3 CM |
220 | struct inode * inode; |
221 | struct dentry * root_dentry; | |
222 | struct btrfs_super_block *disk_super; | |
223 | struct btrfs_root *tree_root; | |
224 | struct btrfs_inode *bi; | |
225 | int err; | |
a429e513 | 226 | |
39279cc3 CM |
227 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
228 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
229 | sb->s_op = &btrfs_super_ops; | |
5103e947 | 230 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 231 | sb->s_time_gran = 1; |
a429e513 | 232 | |
39279cc3 | 233 | tree_root = open_ctree(sb); |
6567e837 | 234 | |
39279cc3 CM |
235 | if (!tree_root || IS_ERR(tree_root)) { |
236 | printk("btrfs: open_ctree failed\n"); | |
237 | return -EIO; | |
a429e513 | 238 | } |
39279cc3 | 239 | sb->s_fs_info = tree_root; |
5f39d397 | 240 | disk_super = &tree_root->fs_info->super_copy; |
39279cc3 CM |
241 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
242 | tree_root); | |
243 | bi = BTRFS_I(inode); | |
244 | bi->location.objectid = inode->i_ino; | |
245 | bi->location.offset = 0; | |
39279cc3 | 246 | bi->root = tree_root; |
b888db2b | 247 | |
39279cc3 | 248 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
a429e513 | 249 | |
39279cc3 | 250 | if (!inode) { |
6567e837 | 251 | err = -ENOMEM; |
39279cc3 | 252 | goto fail_close; |
f254e52c | 253 | } |
39279cc3 CM |
254 | if (inode->i_state & I_NEW) { |
255 | btrfs_read_locked_inode(inode); | |
256 | unlock_new_inode(inode); | |
f254e52c | 257 | } |
f254e52c | 258 | |
39279cc3 CM |
259 | root_dentry = d_alloc_root(inode); |
260 | if (!root_dentry) { | |
261 | iput(inode); | |
262 | err = -ENOMEM; | |
263 | goto fail_close; | |
f254e52c | 264 | } |
58176a96 | 265 | |
b6cda9bc CM |
266 | parse_options((char *)data, tree_root, NULL); |
267 | ||
58176a96 JB |
268 | /* this does the super kobj at the same time */ |
269 | err = btrfs_sysfs_add_super(tree_root->fs_info); | |
270 | if (err) | |
271 | goto fail_close; | |
272 | ||
39279cc3 CM |
273 | sb->s_root = root_dentry; |
274 | btrfs_transaction_queue_work(tree_root, HZ * 30); | |
6885f308 CM |
275 | |
276 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25) | |
277 | save_mount_options(sb, data); | |
278 | #endif | |
279 | ||
2619ba1f | 280 | return 0; |
39279cc3 CM |
281 | |
282 | fail_close: | |
283 | close_ctree(tree_root); | |
284 | return err; | |
2619ba1f CM |
285 | } |
286 | ||
39279cc3 | 287 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
288 | { |
289 | struct btrfs_trans_handle *trans; | |
39279cc3 | 290 | struct btrfs_root *root; |
c5739bba | 291 | int ret; |
39279cc3 | 292 | root = btrfs_sb(sb); |
2619ba1f | 293 | |
39279cc3 CM |
294 | sb->s_dirt = 0; |
295 | if (!wait) { | |
296 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
297 | return 0; | |
298 | } | |
e9d0b13b | 299 | btrfs_clean_old_snapshots(root); |
c5739bba | 300 | mutex_lock(&root->fs_info->fs_mutex); |
e9d0b13b | 301 | btrfs_defrag_dirty_roots(root->fs_info); |
c5739bba | 302 | trans = btrfs_start_transaction(root, 1); |
c5739bba | 303 | ret = btrfs_commit_transaction(trans, root); |
39279cc3 | 304 | sb->s_dirt = 0; |
c5739bba | 305 | mutex_unlock(&root->fs_info->fs_mutex); |
54aa1f4d | 306 | return ret; |
2c90e5d6 CM |
307 | } |
308 | ||
39279cc3 | 309 | static void btrfs_write_super(struct super_block *sb) |
2c90e5d6 | 310 | { |
39279cc3 | 311 | sb->s_dirt = 0; |
2c90e5d6 CM |
312 | } |
313 | ||
4b82d6e4 Y |
314 | /* |
315 | * This is almost a copy of get_sb_bdev in fs/super.c. | |
316 | * We need the local copy to allow direct mounting of | |
317 | * subvolumes, but this could be easily integrated back | |
318 | * into the generic version. --hch | |
319 | */ | |
320 | ||
321 | /* start copy & paste */ | |
322 | static int set_bdev_super(struct super_block *s, void *data) | |
323 | { | |
324 | s->s_bdev = data; | |
325 | s->s_dev = s->s_bdev->bd_dev; | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static int test_bdev_super(struct super_block *s, void *data) | |
330 | { | |
331 | return (void *)s->s_bdev == data; | |
332 | } | |
333 | ||
334 | int btrfs_get_sb_bdev(struct file_system_type *fs_type, | |
335 | int flags, const char *dev_name, void *data, | |
336 | int (*fill_super)(struct super_block *, void *, int), | |
337 | struct vfsmount *mnt, const char *subvol) | |
338 | { | |
339 | struct block_device *bdev = NULL; | |
340 | struct super_block *s; | |
341 | struct dentry *root; | |
342 | int error = 0; | |
343 | ||
344 | bdev = open_bdev_excl(dev_name, flags, fs_type); | |
345 | if (IS_ERR(bdev)) | |
346 | return PTR_ERR(bdev); | |
347 | ||
348 | /* | |
349 | * once the super is inserted into the list by sget, s_umount | |
350 | * will protect the lockfs code from trying to start a snapshot | |
351 | * while we are mounting | |
352 | */ | |
353 | down(&bdev->bd_mount_sem); | |
354 | s = sget(fs_type, test_bdev_super, set_bdev_super, bdev); | |
355 | up(&bdev->bd_mount_sem); | |
356 | if (IS_ERR(s)) | |
357 | goto error_s; | |
358 | ||
359 | if (s->s_root) { | |
360 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
361 | up_write(&s->s_umount); | |
362 | deactivate_super(s); | |
363 | error = -EBUSY; | |
364 | goto error_bdev; | |
365 | } | |
366 | ||
367 | close_bdev_excl(bdev); | |
368 | } else { | |
369 | char b[BDEVNAME_SIZE]; | |
370 | ||
371 | s->s_flags = flags; | |
372 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); | |
373 | sb_set_blocksize(s, block_size(bdev)); | |
374 | error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); | |
375 | if (error) { | |
376 | up_write(&s->s_umount); | |
377 | deactivate_super(s); | |
378 | goto error; | |
379 | } | |
380 | ||
381 | s->s_flags |= MS_ACTIVE; | |
382 | } | |
383 | ||
384 | if (subvol) { | |
385 | root = lookup_one_len(subvol, s->s_root, strlen(subvol)); | |
386 | if (IS_ERR(root)) { | |
387 | up_write(&s->s_umount); | |
388 | deactivate_super(s); | |
389 | error = PTR_ERR(root); | |
390 | goto error; | |
391 | } | |
392 | if (!root->d_inode) { | |
393 | dput(root); | |
394 | up_write(&s->s_umount); | |
395 | deactivate_super(s); | |
396 | error = -ENXIO; | |
397 | goto error; | |
398 | } | |
399 | } else { | |
400 | root = dget(s->s_root); | |
401 | } | |
402 | ||
403 | mnt->mnt_sb = s; | |
404 | mnt->mnt_root = root; | |
405 | return 0; | |
406 | ||
407 | error_s: | |
408 | error = PTR_ERR(s); | |
409 | error_bdev: | |
410 | close_bdev_excl(bdev); | |
411 | error: | |
412 | return error; | |
413 | } | |
414 | /* end copy & paste */ | |
415 | ||
2e635a27 | 416 | static int btrfs_get_sb(struct file_system_type *fs_type, |
95e05289 | 417 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
2e635a27 | 418 | { |
4b82d6e4 | 419 | int ret; |
95e05289 | 420 | char *subvol_name = NULL; |
4b82d6e4 | 421 | |
95e05289 | 422 | parse_options((char *)data, NULL, &subvol_name); |
4b82d6e4 Y |
423 | ret = btrfs_get_sb_bdev(fs_type, flags, dev_name, data, |
424 | btrfs_fill_super, mnt, | |
425 | subvol_name ? subvol_name : "default"); | |
c59f8951 CM |
426 | if (subvol_name) |
427 | kfree(subvol_name); | |
4b82d6e4 | 428 | return ret; |
2e635a27 CM |
429 | } |
430 | ||
8fd17795 CM |
431 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
432 | { | |
433 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 434 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
db94535d | 435 | int bits = dentry->d_sb->s_blocksize_bits; |
8fd17795 CM |
436 | |
437 | buf->f_namelen = BTRFS_NAME_LEN; | |
db94535d CM |
438 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
439 | buf->f_bfree = buf->f_blocks - | |
440 | (btrfs_super_bytes_used(disk_super) >> bits); | |
8fd17795 CM |
441 | buf->f_bavail = buf->f_bfree; |
442 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
443 | buf->f_type = BTRFS_SUPER_MAGIC; | |
444 | return 0; | |
445 | } | |
b5133862 | 446 | |
2e635a27 CM |
447 | static struct file_system_type btrfs_fs_type = { |
448 | .owner = THIS_MODULE, | |
449 | .name = "btrfs", | |
450 | .get_sb = btrfs_get_sb, | |
451 | .kill_sb = kill_block_super, | |
452 | .fs_flags = FS_REQUIRES_DEV, | |
453 | }; | |
ed0dab6b Y |
454 | static void btrfs_write_super_lockfs(struct super_block *sb) |
455 | { | |
456 | struct btrfs_root *root = btrfs_sb(sb); | |
457 | btrfs_transaction_flush_work(root); | |
458 | } | |
459 | ||
460 | static void btrfs_unlockfs(struct super_block *sb) | |
461 | { | |
462 | struct btrfs_root *root = btrfs_sb(sb); | |
463 | btrfs_transaction_queue_work(root, HZ * 30); | |
464 | } | |
2e635a27 | 465 | |
e20d96d6 | 466 | static struct super_operations btrfs_super_ops = { |
134e9731 | 467 | .delete_inode = btrfs_delete_inode, |
2da98f00 | 468 | .put_inode = btrfs_put_inode, |
e20d96d6 | 469 | .put_super = btrfs_put_super, |
d5719762 CM |
470 | .write_super = btrfs_write_super, |
471 | .sync_fs = btrfs_sync_fs, | |
6885f308 CM |
472 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25) |
473 | .read_inode = btrfs_read_locked_inode, | |
474 | #else | |
475 | .show_options = generic_show_options, | |
476 | #endif | |
4730a4bc | 477 | .write_inode = btrfs_write_inode, |
b5133862 | 478 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
479 | .alloc_inode = btrfs_alloc_inode, |
480 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 481 | .statfs = btrfs_statfs, |
ed0dab6b Y |
482 | .write_super_lockfs = btrfs_write_super_lockfs, |
483 | .unlockfs = btrfs_unlockfs, | |
e20d96d6 | 484 | }; |
2e635a27 CM |
485 | static int __init init_btrfs_fs(void) |
486 | { | |
2c90e5d6 | 487 | int err; |
58176a96 JB |
488 | |
489 | err = btrfs_init_sysfs(); | |
490 | if (err) | |
491 | return err; | |
492 | ||
08607c1b | 493 | btrfs_init_transaction_sys(); |
39279cc3 | 494 | err = btrfs_init_cachep(); |
2c90e5d6 | 495 | if (err) |
2f4cbe64 | 496 | goto free_transaction_sys; |
d1310b2e CM |
497 | |
498 | err = extent_io_init(); | |
2f4cbe64 WB |
499 | if (err) |
500 | goto free_cachep; | |
501 | ||
d1310b2e CM |
502 | err = extent_map_init(); |
503 | if (err) | |
504 | goto free_extent_io; | |
505 | ||
2f4cbe64 WB |
506 | err = register_filesystem(&btrfs_fs_type); |
507 | if (err) | |
508 | goto free_extent_map; | |
509 | return 0; | |
510 | ||
511 | free_extent_map: | |
512 | extent_map_exit(); | |
d1310b2e CM |
513 | free_extent_io: |
514 | extent_io_exit(); | |
2f4cbe64 WB |
515 | free_cachep: |
516 | btrfs_destroy_cachep(); | |
517 | free_transaction_sys: | |
518 | btrfs_exit_transaction_sys(); | |
519 | btrfs_exit_sysfs(); | |
520 | return err; | |
2e635a27 CM |
521 | } |
522 | ||
523 | static void __exit exit_btrfs_fs(void) | |
524 | { | |
08607c1b | 525 | btrfs_exit_transaction_sys(); |
39279cc3 | 526 | btrfs_destroy_cachep(); |
a52d9a80 | 527 | extent_map_exit(); |
d1310b2e | 528 | extent_io_exit(); |
2e635a27 | 529 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 530 | btrfs_exit_sysfs(); |
2e635a27 CM |
531 | } |
532 | ||
533 | module_init(init_btrfs_fs) | |
534 | module_exit(exit_btrfs_fs) | |
535 | ||
536 | MODULE_LICENSE("GPL"); |