Commit | Line | Data |
---|---|---|
2e635a27 | 1 | #include <linux/module.h> |
e20d96d6 | 2 | #include <linux/buffer_head.h> |
2e635a27 CM |
3 | #include <linux/fs.h> |
4 | #include <linux/pagemap.h> | |
5 | #include <linux/highmem.h> | |
6 | #include <linux/time.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/string.h> | |
9 | #include <linux/smp_lock.h> | |
10 | #include <linux/backing-dev.h> | |
dee26a9f | 11 | #include <linux/mpage.h> |
75dfe396 CM |
12 | #include <linux/swap.h> |
13 | #include <linux/writeback.h> | |
8fd17795 | 14 | #include <linux/statfs.h> |
2e635a27 | 15 | #include "ctree.h" |
e20d96d6 | 16 | #include "disk-io.h" |
d5719762 | 17 | #include "transaction.h" |
2c90e5d6 | 18 | #include "btrfs_inode.h" |
c5739bba | 19 | #include "ioctl.h" |
2e635a27 | 20 | |
d6e4a428 CM |
21 | void btrfs_fsinfo_release(struct kobject *obj) |
22 | { | |
23 | struct btrfs_fs_info *fsinfo = container_of(obj, | |
24 | struct btrfs_fs_info, kobj); | |
25 | kfree(fsinfo); | |
26 | } | |
27 | ||
28 | struct kobj_type btrfs_fsinfo_ktype = { | |
29 | .release = btrfs_fsinfo_release, | |
30 | }; | |
31 | ||
c5739bba CM |
32 | struct btrfs_iget_args { |
33 | u64 ino; | |
34 | struct btrfs_root *root; | |
35 | }; | |
36 | ||
d6e4a428 CM |
37 | decl_subsys(btrfs, &btrfs_fsinfo_ktype, NULL); |
38 | ||
2e635a27 | 39 | #define BTRFS_SUPER_MAGIC 0x9123682E |
e20d96d6 CM |
40 | |
41 | static struct inode_operations btrfs_dir_inode_operations; | |
d6e4a428 | 42 | static struct inode_operations btrfs_dir_ro_inode_operations; |
e20d96d6 CM |
43 | static struct super_operations btrfs_super_ops; |
44 | static struct file_operations btrfs_dir_file_operations; | |
dee26a9f CM |
45 | static struct inode_operations btrfs_file_inode_operations; |
46 | static struct address_space_operations btrfs_aops; | |
47 | static struct file_operations btrfs_file_operations; | |
e20d96d6 | 48 | |
e20d96d6 | 49 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 50 | { |
5caf2a00 | 51 | struct btrfs_path *path; |
e20d96d6 | 52 | struct btrfs_inode_item *inode_item; |
d6e4a428 CM |
53 | struct btrfs_root *root = BTRFS_I(inode)->root; |
54 | struct btrfs_key location; | |
e20d96d6 | 55 | int ret; |
f4b9aa8d | 56 | |
5caf2a00 CM |
57 | path = btrfs_alloc_path(); |
58 | BUG_ON(!path); | |
59 | btrfs_init_path(path); | |
f4b9aa8d CM |
60 | mutex_lock(&root->fs_info->fs_mutex); |
61 | ||
d6e4a428 CM |
62 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
63 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
e20d96d6 | 64 | if (ret) { |
7cfcc17e | 65 | btrfs_free_path(path); |
d6e4a428 | 66 | goto make_bad; |
e20d96d6 | 67 | } |
5caf2a00 CM |
68 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
69 | path->slots[0], | |
e20d96d6 | 70 | struct btrfs_inode_item); |
2e635a27 | 71 | |
e20d96d6 CM |
72 | inode->i_mode = btrfs_inode_mode(inode_item); |
73 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
74 | inode->i_uid = btrfs_inode_uid(inode_item); | |
75 | inode->i_gid = btrfs_inode_gid(inode_item); | |
76 | inode->i_size = btrfs_inode_size(inode_item); | |
77 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
78 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
79 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
80 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
81 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
82 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
83 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
84 | inode->i_generation = btrfs_inode_generation(inode_item); | |
5caf2a00 | 85 | |
5caf2a00 CM |
86 | btrfs_free_path(path); |
87 | inode_item = NULL; | |
88 | ||
f4b9aa8d | 89 | mutex_unlock(&root->fs_info->fs_mutex); |
1b05da2e | 90 | |
e20d96d6 CM |
91 | switch (inode->i_mode & S_IFMT) { |
92 | #if 0 | |
93 | default: | |
94 | init_special_inode(inode, inode->i_mode, | |
95 | btrfs_inode_rdev(inode_item)); | |
96 | break; | |
97 | #endif | |
98 | case S_IFREG: | |
dee26a9f CM |
99 | inode->i_mapping->a_ops = &btrfs_aops; |
100 | inode->i_fop = &btrfs_file_operations; | |
101 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
102 | break; |
103 | case S_IFDIR: | |
e20d96d6 | 104 | inode->i_fop = &btrfs_dir_file_operations; |
d6e4a428 CM |
105 | if (root == root->fs_info->tree_root) |
106 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
107 | else | |
108 | inode->i_op = &btrfs_dir_inode_operations; | |
e20d96d6 CM |
109 | break; |
110 | case S_IFLNK: | |
e20d96d6 CM |
111 | // inode->i_op = &page_symlink_inode_operations; |
112 | break; | |
2e635a27 | 113 | } |
e20d96d6 | 114 | return; |
d6e4a428 CM |
115 | |
116 | make_bad: | |
117 | btrfs_release_path(root, path); | |
118 | btrfs_free_path(path); | |
119 | mutex_unlock(&root->fs_info->fs_mutex); | |
120 | make_bad_inode(inode); | |
2e635a27 CM |
121 | } |
122 | ||
5f443fd2 CM |
123 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
124 | struct btrfs_root *root, | |
125 | struct inode *dir, | |
126 | struct dentry *dentry) | |
134e9731 | 127 | { |
5caf2a00 | 128 | struct btrfs_path *path; |
134e9731 CM |
129 | const char *name = dentry->d_name.name; |
130 | int name_len = dentry->d_name.len; | |
7e38180e | 131 | int ret = 0; |
134e9731 CM |
132 | u64 objectid; |
133 | struct btrfs_dir_item *di; | |
134 | ||
5caf2a00 CM |
135 | path = btrfs_alloc_path(); |
136 | BUG_ON(!path); | |
137 | btrfs_init_path(path); | |
7e38180e | 138 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
134e9731 | 139 | name, name_len, -1); |
7e38180e CM |
140 | if (IS_ERR(di)) { |
141 | ret = PTR_ERR(di); | |
134e9731 | 142 | goto err; |
7e38180e CM |
143 | } |
144 | if (!di) { | |
134e9731 CM |
145 | ret = -ENOENT; |
146 | goto err; | |
147 | } | |
d6e4a428 | 148 | objectid = btrfs_disk_key_objectid(&di->location); |
7e38180e CM |
149 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
150 | BUG_ON(ret); | |
151 | btrfs_release_path(root, path); | |
134e9731 | 152 | |
7e38180e CM |
153 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
154 | objectid, name, name_len, -1); | |
155 | if (IS_ERR(di)) { | |
156 | ret = PTR_ERR(di); | |
157 | goto err; | |
158 | } | |
159 | if (!di) { | |
160 | ret = -ENOENT; | |
161 | goto err; | |
162 | } | |
163 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
5f26f772 CM |
164 | BUG_ON(ret); |
165 | ||
134e9731 CM |
166 | dentry->d_inode->i_ctime = dir->i_ctime; |
167 | err: | |
5caf2a00 | 168 | btrfs_free_path(path); |
d4dbff95 | 169 | if (ret == 0) { |
134e9731 | 170 | inode_dec_link_count(dentry->d_inode); |
5f26f772 | 171 | dir->i_size -= name_len * 2; |
d4dbff95 CM |
172 | mark_inode_dirty(dir); |
173 | } | |
134e9731 CM |
174 | return ret; |
175 | } | |
176 | ||
5f443fd2 CM |
177 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
178 | { | |
179 | struct btrfs_root *root; | |
180 | struct btrfs_trans_handle *trans; | |
181 | int ret; | |
182 | ||
d6e4a428 | 183 | root = BTRFS_I(dir)->root; |
5f443fd2 CM |
184 | mutex_lock(&root->fs_info->fs_mutex); |
185 | trans = btrfs_start_transaction(root, 1); | |
186 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
187 | btrfs_end_transaction(trans, root); | |
188 | mutex_unlock(&root->fs_info->fs_mutex); | |
189 | return ret; | |
190 | } | |
191 | ||
192 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
193 | { | |
194 | struct inode *inode = dentry->d_inode; | |
195 | int err; | |
196 | int ret; | |
d6e4a428 | 197 | struct btrfs_root *root = BTRFS_I(dir)->root; |
5caf2a00 | 198 | struct btrfs_path *path; |
5f443fd2 CM |
199 | struct btrfs_key key; |
200 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
201 | struct btrfs_key found_key; |
202 | int found_type; | |
5f443fd2 | 203 | struct btrfs_leaf *leaf; |
5f26f772 | 204 | char *goodnames = ".."; |
5f443fd2 | 205 | |
5caf2a00 CM |
206 | path = btrfs_alloc_path(); |
207 | BUG_ON(!path); | |
208 | btrfs_init_path(path); | |
5f443fd2 CM |
209 | mutex_lock(&root->fs_info->fs_mutex); |
210 | trans = btrfs_start_transaction(root, 1); | |
211 | key.objectid = inode->i_ino; | |
212 | key.offset = (u64)-1; | |
5f26f772 CM |
213 | key.flags = (u32)-1; |
214 | while(1) { | |
215 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
216 | if (ret < 0) { | |
217 | err = ret; | |
218 | goto out; | |
219 | } | |
220 | BUG_ON(ret == 0); | |
221 | if (path->slots[0] == 0) { | |
222 | err = -ENOENT; | |
223 | goto out; | |
224 | } | |
225 | path->slots[0]--; | |
226 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
227 | btrfs_disk_key_to_cpu(&found_key, | |
228 | &leaf->items[path->slots[0]].key); | |
229 | found_type = btrfs_key_type(&found_key); | |
230 | if (found_key.objectid != inode->i_ino) { | |
231 | err = -ENOENT; | |
232 | goto out; | |
233 | } | |
234 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
235 | found_type != BTRFS_DIR_INDEX_KEY) || | |
236 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
237 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
238 | err = -ENOTEMPTY; | |
239 | goto out; | |
240 | } | |
241 | ret = btrfs_del_item(trans, root, path); | |
242 | BUG_ON(ret); | |
5f443fd2 | 243 | |
5f26f772 CM |
244 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
245 | break; | |
246 | btrfs_release_path(root, path); | |
5f443fd2 | 247 | } |
5f26f772 | 248 | ret = 0; |
5caf2a00 | 249 | btrfs_release_path(root, path); |
5f443fd2 CM |
250 | |
251 | /* now the directory is empty */ | |
252 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
253 | if (!err) { | |
254 | inode->i_size = 0; | |
255 | } | |
256 | out: | |
7cfcc17e CM |
257 | btrfs_release_path(root, path); |
258 | btrfs_free_path(path); | |
5f443fd2 CM |
259 | mutex_unlock(&root->fs_info->fs_mutex); |
260 | ret = btrfs_end_transaction(trans, root); | |
261 | if (ret && !err) | |
262 | err = ret; | |
263 | return err; | |
264 | } | |
265 | ||
134e9731 CM |
266 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
267 | struct btrfs_root *root, | |
268 | struct inode *inode) | |
269 | { | |
5caf2a00 | 270 | struct btrfs_path *path; |
134e9731 | 271 | int ret; |
5caf2a00 | 272 | |
134e9731 | 273 | clear_inode(inode); |
5caf2a00 CM |
274 | |
275 | path = btrfs_alloc_path(); | |
276 | BUG_ON(!path); | |
277 | btrfs_init_path(path); | |
d6e4a428 CM |
278 | ret = btrfs_lookup_inode(trans, root, path, |
279 | &BTRFS_I(inode)->location, -1); | |
134e9731 | 280 | BUG_ON(ret); |
5caf2a00 | 281 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 282 | BUG_ON(ret); |
5caf2a00 | 283 | btrfs_free_path(path); |
134e9731 CM |
284 | return ret; |
285 | } | |
286 | ||
f4b9aa8d CM |
287 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
288 | struct btrfs_root *root, | |
289 | struct inode *inode) | |
290 | { | |
291 | int ret; | |
5caf2a00 | 292 | struct btrfs_path *path; |
f4b9aa8d CM |
293 | struct btrfs_key key; |
294 | struct btrfs_disk_key *found_key; | |
295 | struct btrfs_leaf *leaf; | |
f254e52c CM |
296 | struct btrfs_file_extent_item *fi = NULL; |
297 | u64 extent_start = 0; | |
298 | u64 extent_num_blocks = 0; | |
299 | int found_extent; | |
f4b9aa8d | 300 | |
5caf2a00 CM |
301 | path = btrfs_alloc_path(); |
302 | BUG_ON(!path); | |
f4b9aa8d CM |
303 | /* FIXME, add redo link to tree so we don't leak on crash */ |
304 | key.objectid = inode->i_ino; | |
305 | key.offset = (u64)-1; | |
306 | key.flags = 0; | |
d4dbff95 CM |
307 | /* |
308 | * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys | |
309 | * or extent data | |
310 | */ | |
f254e52c | 311 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
f4b9aa8d | 312 | while(1) { |
5caf2a00 CM |
313 | btrfs_init_path(path); |
314 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
f4b9aa8d | 315 | if (ret < 0) { |
f4b9aa8d CM |
316 | goto error; |
317 | } | |
318 | if (ret > 0) { | |
5caf2a00 CM |
319 | BUG_ON(path->slots[0] == 0); |
320 | path->slots[0]--; | |
f4b9aa8d | 321 | } |
5caf2a00 CM |
322 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
323 | found_key = &leaf->items[path->slots[0]].key; | |
f4b9aa8d CM |
324 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
325 | break; | |
f254e52c | 326 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
d4dbff95 | 327 | btrfs_disk_key_type(found_key) != BTRFS_INLINE_DATA_KEY && |
f254e52c | 328 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) |
f4b9aa8d | 329 | break; |
f4b9aa8d CM |
330 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
331 | break; | |
236454df | 332 | found_extent = 0; |
f254e52c | 333 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
5caf2a00 CM |
334 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
335 | path->slots[0], | |
f254e52c | 336 | struct btrfs_file_extent_item); |
236454df CM |
337 | if (btrfs_file_extent_type(fi) != |
338 | BTRFS_FILE_EXTENT_INLINE) { | |
339 | extent_start = | |
340 | btrfs_file_extent_disk_blocknr(fi); | |
341 | extent_num_blocks = | |
342 | btrfs_file_extent_disk_num_blocks(fi); | |
343 | /* FIXME blocksize != 4096 */ | |
344 | inode->i_blocks -= | |
345 | btrfs_file_extent_num_blocks(fi) << 3; | |
346 | found_extent = 1; | |
347 | } | |
f254e52c | 348 | } |
5caf2a00 | 349 | ret = btrfs_del_item(trans, root, path); |
f4b9aa8d | 350 | BUG_ON(ret); |
5caf2a00 | 351 | btrfs_release_path(root, path); |
f254e52c CM |
352 | if (found_extent) { |
353 | ret = btrfs_free_extent(trans, root, extent_start, | |
354 | extent_num_blocks, 0); | |
355 | BUG_ON(ret); | |
356 | } | |
f4b9aa8d | 357 | } |
f4b9aa8d CM |
358 | ret = 0; |
359 | error: | |
5caf2a00 CM |
360 | btrfs_release_path(root, path); |
361 | btrfs_free_path(path); | |
f4b9aa8d CM |
362 | return ret; |
363 | } | |
364 | ||
134e9731 CM |
365 | static void btrfs_delete_inode(struct inode *inode) |
366 | { | |
367 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 368 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
369 | int ret; |
370 | ||
134e9731 CM |
371 | truncate_inode_pages(&inode->i_data, 0); |
372 | if (is_bad_inode(inode)) { | |
373 | goto no_delete; | |
374 | } | |
375 | inode->i_size = 0; | |
134e9731 CM |
376 | mutex_lock(&root->fs_info->fs_mutex); |
377 | trans = btrfs_start_transaction(root, 1); | |
f4b9aa8d CM |
378 | if (S_ISREG(inode->i_mode)) { |
379 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
380 | BUG_ON(ret); | |
381 | } | |
134e9731 CM |
382 | btrfs_free_inode(trans, root, inode); |
383 | btrfs_end_transaction(trans, root); | |
384 | mutex_unlock(&root->fs_info->fs_mutex); | |
385 | return; | |
386 | no_delete: | |
387 | clear_inode(inode); | |
388 | } | |
389 | ||
e20d96d6 | 390 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
d6e4a428 | 391 | struct btrfs_key *location) |
e20d96d6 CM |
392 | { |
393 | const char *name = dentry->d_name.name; | |
394 | int namelen = dentry->d_name.len; | |
395 | struct btrfs_dir_item *di; | |
5caf2a00 | 396 | struct btrfs_path *path; |
d6e4a428 | 397 | struct btrfs_root *root = BTRFS_I(dir)->root; |
e20d96d6 CM |
398 | int ret; |
399 | ||
5caf2a00 CM |
400 | path = btrfs_alloc_path(); |
401 | BUG_ON(!path); | |
402 | btrfs_init_path(path); | |
7e38180e | 403 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
e20d96d6 | 404 | namelen, 0); |
7e38180e | 405 | if (!di || IS_ERR(di)) { |
d6e4a428 | 406 | location->objectid = 0; |
2c90e5d6 | 407 | ret = 0; |
e20d96d6 CM |
408 | goto out; |
409 | } | |
d6e4a428 | 410 | btrfs_disk_key_to_cpu(location, &di->location); |
e20d96d6 | 411 | out: |
5caf2a00 CM |
412 | btrfs_release_path(root, path); |
413 | btrfs_free_path(path); | |
e20d96d6 CM |
414 | return ret; |
415 | } | |
416 | ||
d6e4a428 CM |
417 | int fixup_tree_root_location(struct btrfs_root *root, |
418 | struct btrfs_key *location, | |
419 | struct btrfs_root **sub_root) | |
420 | { | |
421 | struct btrfs_path *path; | |
422 | struct btrfs_root_item *ri; | |
d6e4a428 CM |
423 | |
424 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
425 | return 0; | |
426 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
427 | return 0; | |
428 | ||
429 | path = btrfs_alloc_path(); | |
430 | BUG_ON(!path); | |
431 | mutex_lock(&root->fs_info->fs_mutex); | |
432 | ||
0f7d52f4 CM |
433 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
434 | if (IS_ERR(*sub_root)) | |
435 | return PTR_ERR(*sub_root); | |
436 | ||
437 | ri = &(*sub_root)->root_item; | |
d6e4a428 CM |
438 | location->objectid = btrfs_root_dirid(ri); |
439 | location->flags = 0; | |
440 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
441 | location->offset = 0; | |
0f7d52f4 | 442 | |
d6e4a428 CM |
443 | btrfs_free_path(path); |
444 | mutex_unlock(&root->fs_info->fs_mutex); | |
0f7d52f4 | 445 | return 0; |
d6e4a428 CM |
446 | } |
447 | ||
c5739bba CM |
448 | int btrfs_init_locked_inode(struct inode *inode, void *p) |
449 | { | |
450 | struct btrfs_iget_args *args = p; | |
451 | inode->i_ino = args->ino; | |
452 | BTRFS_I(inode)->root = args->root; | |
453 | return 0; | |
454 | } | |
455 | ||
456 | int btrfs_find_actor(struct inode *inode, void *opaque) | |
457 | { | |
458 | struct btrfs_iget_args *args = opaque; | |
459 | return (args->ino == inode->i_ino && | |
460 | args->root == BTRFS_I(inode)->root); | |
461 | } | |
462 | ||
463 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
464 | struct btrfs_root *root) | |
465 | { | |
466 | struct inode *inode; | |
467 | struct btrfs_iget_args args; | |
468 | args.ino = objectid; | |
469 | args.root = root; | |
470 | ||
471 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
472 | btrfs_init_locked_inode, | |
473 | (void *)&args); | |
474 | return inode; | |
475 | } | |
d6e4a428 | 476 | |
e20d96d6 CM |
477 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
478 | struct nameidata *nd) | |
479 | { | |
480 | struct inode * inode; | |
d6e4a428 CM |
481 | struct btrfs_inode *bi = BTRFS_I(dir); |
482 | struct btrfs_root *root = bi->root; | |
483 | struct btrfs_root *sub_root = root; | |
484 | struct btrfs_key location; | |
e20d96d6 CM |
485 | int ret; |
486 | ||
487 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
488 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 489 | mutex_lock(&root->fs_info->fs_mutex); |
d6e4a428 | 490 | ret = btrfs_inode_by_name(dir, dentry, &location); |
22b0ebda | 491 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
492 | if (ret < 0) |
493 | return ERR_PTR(ret); | |
494 | inode = NULL; | |
d6e4a428 CM |
495 | if (location.objectid) { |
496 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
497 | if (ret < 0) | |
498 | return ERR_PTR(ret); | |
499 | if (ret > 0) | |
500 | return ERR_PTR(-ENOENT); | |
c5739bba CM |
501 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
502 | sub_root); | |
e20d96d6 CM |
503 | if (!inode) |
504 | return ERR_PTR(-EACCES); | |
d6e4a428 | 505 | if (inode->i_state & I_NEW) { |
0f7d52f4 | 506 | if (sub_root != root) { |
c5739bba | 507 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
0f7d52f4 CM |
508 | igrab(inode); |
509 | sub_root->inode = inode; | |
510 | } | |
d6e4a428 CM |
511 | BTRFS_I(inode)->root = sub_root; |
512 | memcpy(&BTRFS_I(inode)->location, &location, | |
513 | sizeof(location)); | |
514 | btrfs_read_locked_inode(inode); | |
515 | unlock_new_inode(inode); | |
516 | } | |
e20d96d6 CM |
517 | } |
518 | return d_splice_alias(inode, dentry); | |
519 | } | |
520 | ||
521 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
522 | { | |
523 | struct inode *inode = filp->f_path.dentry->d_inode; | |
d6e4a428 | 524 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e20d96d6 CM |
525 | struct btrfs_item *item; |
526 | struct btrfs_dir_item *di; | |
527 | struct btrfs_key key; | |
5caf2a00 | 528 | struct btrfs_path *path; |
e20d96d6 CM |
529 | int ret; |
530 | u32 nritems; | |
531 | struct btrfs_leaf *leaf; | |
532 | int slot; | |
533 | int advance; | |
534 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 535 | int over = 0; |
7e38180e CM |
536 | u32 di_cur; |
537 | u32 di_total; | |
538 | u32 di_len; | |
539 | int key_type = BTRFS_DIR_INDEX_KEY; | |
d6e4a428 CM |
540 | |
541 | /* FIXME, use a real flag for deciding about the key type */ | |
542 | if (root->fs_info->tree_root == root) | |
543 | key_type = BTRFS_DIR_ITEM_KEY; | |
22b0ebda | 544 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 545 | key.objectid = inode->i_ino; |
e20d96d6 | 546 | key.flags = 0; |
d6e4a428 | 547 | btrfs_set_key_type(&key, key_type); |
e20d96d6 | 548 | key.offset = filp->f_pos; |
5caf2a00 CM |
549 | path = btrfs_alloc_path(); |
550 | btrfs_init_path(path); | |
551 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1b05da2e | 552 | if (ret < 0) |
e20d96d6 | 553 | goto err; |
7f5c1516 | 554 | advance = 0; |
e20d96d6 | 555 | while(1) { |
5caf2a00 | 556 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 557 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 558 | slot = path->slots[0]; |
dee26a9f CM |
559 | if (advance || slot >= nritems) { |
560 | if (slot >= nritems -1) { | |
5caf2a00 | 561 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
562 | if (ret) |
563 | break; | |
5caf2a00 | 564 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 565 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 566 | slot = path->slots[0]; |
e20d96d6 CM |
567 | } else { |
568 | slot++; | |
5caf2a00 | 569 | path->slots[0]++; |
e20d96d6 CM |
570 | } |
571 | } | |
572 | advance = 1; | |
573 | item = leaf->items + slot; | |
e20d96d6 CM |
574 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
575 | break; | |
d6e4a428 | 576 | if (btrfs_disk_key_type(&item->key) != key_type) |
a429e513 | 577 | break; |
7f5c1516 CM |
578 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
579 | continue; | |
7fcde0e3 | 580 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
dee26a9f | 581 | advance = 1; |
e20d96d6 | 582 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
7e38180e CM |
583 | di_cur = 0; |
584 | di_total = btrfs_item_size(leaf->items + slot); | |
585 | while(di_cur < di_total) { | |
586 | over = filldir(dirent, (const char *)(di + 1), | |
587 | btrfs_dir_name_len(di), | |
588 | btrfs_disk_key_offset(&item->key), | |
589 | btrfs_disk_key_objectid(&di->location), | |
590 | d_type); | |
591 | if (over) | |
592 | goto nopos; | |
593 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
594 | di_cur += di_len; | |
595 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
596 | } | |
e20d96d6 | 597 | } |
7fcde0e3 CM |
598 | filp->f_pos++; |
599 | nopos: | |
e20d96d6 CM |
600 | ret = 0; |
601 | err: | |
5caf2a00 CM |
602 | btrfs_release_path(root, path); |
603 | btrfs_free_path(path); | |
22b0ebda | 604 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
605 | return ret; |
606 | } | |
607 | ||
608 | static void btrfs_put_super (struct super_block * sb) | |
609 | { | |
610 | struct btrfs_root *root = btrfs_sb(sb); | |
611 | int ret; | |
612 | ||
613 | ret = close_ctree(root); | |
614 | if (ret) { | |
615 | printk("close ctree returns %d\n", ret); | |
616 | } | |
617 | sb->s_fs_info = NULL; | |
618 | } | |
2e635a27 CM |
619 | |
620 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
621 | { | |
622 | struct inode * inode; | |
e20d96d6 CM |
623 | struct dentry * root_dentry; |
624 | struct btrfs_super_block *disk_super; | |
0f7d52f4 | 625 | struct btrfs_root *tree_root; |
d6e4a428 | 626 | struct btrfs_inode *bi; |
2e635a27 CM |
627 | |
628 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 629 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 630 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 631 | sb->s_time_gran = 1; |
e20d96d6 | 632 | |
0f7d52f4 | 633 | tree_root = open_ctree(sb); |
d98237b3 | 634 | |
0f7d52f4 | 635 | if (!tree_root) { |
e20d96d6 CM |
636 | printk("btrfs: open_ctree failed\n"); |
637 | return -EIO; | |
638 | } | |
0f7d52f4 CM |
639 | sb->s_fs_info = tree_root; |
640 | disk_super = tree_root->fs_info->disk_super; | |
e20d96d6 CM |
641 | printk("read in super total blocks %Lu root %Lu\n", |
642 | btrfs_super_total_blocks(disk_super), | |
643 | btrfs_super_root_dir(disk_super)); | |
644 | ||
c5739bba CM |
645 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
646 | tree_root); | |
d6e4a428 CM |
647 | bi = BTRFS_I(inode); |
648 | bi->location.objectid = inode->i_ino; | |
649 | bi->location.offset = 0; | |
650 | bi->location.flags = 0; | |
0f7d52f4 | 651 | bi->root = tree_root; |
d6e4a428 CM |
652 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
653 | ||
2e635a27 CM |
654 | if (!inode) |
655 | return -ENOMEM; | |
e20d96d6 CM |
656 | if (inode->i_state & I_NEW) { |
657 | btrfs_read_locked_inode(inode); | |
658 | unlock_new_inode(inode); | |
659 | } | |
2e635a27 | 660 | |
e20d96d6 CM |
661 | root_dentry = d_alloc_root(inode); |
662 | if (!root_dentry) { | |
2e635a27 CM |
663 | iput(inode); |
664 | return -ENOMEM; | |
665 | } | |
e20d96d6 CM |
666 | sb->s_root = root_dentry; |
667 | ||
2e635a27 CM |
668 | return 0; |
669 | } | |
670 | ||
d5719762 CM |
671 | static void fill_inode_item(struct btrfs_inode_item *item, |
672 | struct inode *inode) | |
673 | { | |
674 | btrfs_set_inode_uid(item, inode->i_uid); | |
675 | btrfs_set_inode_gid(item, inode->i_gid); | |
676 | btrfs_set_inode_size(item, inode->i_size); | |
677 | btrfs_set_inode_mode(item, inode->i_mode); | |
678 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
679 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
680 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
681 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
682 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
683 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
684 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
685 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
686 | btrfs_set_inode_generation(item, inode->i_generation); | |
687 | } | |
688 | ||
4730a4bc CM |
689 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
690 | struct btrfs_root *root, | |
691 | struct inode *inode) | |
692 | { | |
693 | struct btrfs_inode_item *inode_item; | |
5caf2a00 | 694 | struct btrfs_path *path; |
4730a4bc CM |
695 | int ret; |
696 | ||
5caf2a00 CM |
697 | path = btrfs_alloc_path(); |
698 | BUG_ON(!path); | |
699 | btrfs_init_path(path); | |
d6e4a428 CM |
700 | ret = btrfs_lookup_inode(trans, root, path, |
701 | &BTRFS_I(inode)->location, 1); | |
4730a4bc CM |
702 | if (ret) { |
703 | if (ret > 0) | |
704 | ret = -ENOENT; | |
705 | goto failed; | |
706 | } | |
707 | ||
5caf2a00 CM |
708 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
709 | path->slots[0], | |
4730a4bc CM |
710 | struct btrfs_inode_item); |
711 | ||
712 | fill_inode_item(inode_item, inode); | |
5caf2a00 | 713 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1b05da2e | 714 | ret = 0; |
4730a4bc | 715 | failed: |
5caf2a00 CM |
716 | btrfs_release_path(root, path); |
717 | btrfs_free_path(path); | |
1b05da2e | 718 | return ret; |
4730a4bc CM |
719 | } |
720 | ||
721 | static int btrfs_write_inode(struct inode *inode, int wait) | |
722 | { | |
d6e4a428 | 723 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4730a4bc CM |
724 | struct btrfs_trans_handle *trans; |
725 | int ret; | |
726 | ||
727 | mutex_lock(&root->fs_info->fs_mutex); | |
728 | trans = btrfs_start_transaction(root, 1); | |
729 | ret = btrfs_update_inode(trans, root, inode); | |
730 | if (wait) | |
731 | btrfs_commit_transaction(trans, root); | |
732 | else | |
733 | btrfs_end_transaction(trans, root); | |
734 | mutex_unlock(&root->fs_info->fs_mutex); | |
735 | return ret; | |
736 | } | |
737 | ||
d5719762 | 738 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2619ba1f CM |
739 | struct btrfs_root *root, |
740 | u64 objectid, int mode) | |
d5719762 CM |
741 | { |
742 | struct inode *inode; | |
743 | struct btrfs_inode_item inode_item; | |
1b05da2e | 744 | struct btrfs_key *location; |
d5719762 | 745 | int ret; |
d5719762 | 746 | |
2619ba1f | 747 | inode = new_inode(root->fs_info->sb); |
d5719762 CM |
748 | if (!inode) |
749 | return ERR_PTR(-ENOMEM); | |
750 | ||
2619ba1f | 751 | BTRFS_I(inode)->root = root; |
d5719762 CM |
752 | |
753 | inode->i_uid = current->fsuid; | |
754 | inode->i_gid = current->fsgid; | |
755 | inode->i_mode = mode; | |
756 | inode->i_ino = objectid; | |
757 | inode->i_blocks = 0; | |
c5739bba | 758 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
d5719762 | 759 | fill_inode_item(&inode_item, inode); |
1b05da2e CM |
760 | location = &BTRFS_I(inode)->location; |
761 | location->objectid = objectid; | |
762 | location->flags = 0; | |
763 | location->offset = 0; | |
764 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
d5719762 CM |
765 | |
766 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
767 | BUG_ON(ret); | |
768 | ||
769 | insert_inode_hash(inode); | |
d5719762 CM |
770 | return inode; |
771 | } | |
772 | ||
773 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
774 | struct dentry *dentry, struct inode *inode) | |
775 | { | |
776 | int ret; | |
d6e4a428 CM |
777 | struct btrfs_key key; |
778 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
779 | key.objectid = inode->i_ino; | |
780 | key.flags = 0; | |
781 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
782 | key.offset = 0; | |
783 | ||
784 | ret = btrfs_insert_dir_item(trans, root, | |
d5719762 CM |
785 | dentry->d_name.name, dentry->d_name.len, |
786 | dentry->d_parent->d_inode->i_ino, | |
d6e4a428 | 787 | &key, 0); |
4730a4bc | 788 | if (ret == 0) { |
5f26f772 | 789 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
d6e4a428 | 790 | ret = btrfs_update_inode(trans, root, |
4730a4bc CM |
791 | dentry->d_parent->d_inode); |
792 | } | |
d5719762 CM |
793 | return ret; |
794 | } | |
795 | ||
796 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
797 | struct dentry *dentry, struct inode *inode) | |
798 | { | |
799 | int err = btrfs_add_link(trans, dentry, inode); | |
800 | if (!err) { | |
801 | d_instantiate(dentry, inode); | |
802 | return 0; | |
803 | } | |
2c90e5d6 CM |
804 | if (err > 0) |
805 | err = -EEXIST; | |
d5719762 CM |
806 | return err; |
807 | } | |
808 | ||
809 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
810 | int mode, struct nameidata *nd) | |
811 | { | |
812 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 813 | struct btrfs_root *root = BTRFS_I(dir)->root; |
d5719762 CM |
814 | struct inode *inode; |
815 | int err; | |
134e9731 | 816 | int drop_inode = 0; |
2619ba1f | 817 | u64 objectid; |
d5719762 | 818 | |
d561c025 | 819 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 | 820 | trans = btrfs_start_transaction(root, 1); |
2619ba1f CM |
821 | |
822 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
823 | if (err) { | |
824 | err = -ENOSPC; | |
825 | goto out_unlock; | |
826 | } | |
827 | ||
828 | inode = btrfs_new_inode(trans, root, objectid, mode); | |
d5719762 CM |
829 | err = PTR_ERR(inode); |
830 | if (IS_ERR(inode)) | |
d561c025 | 831 | goto out_unlock; |
d5719762 CM |
832 | // FIXME mark the inode dirty |
833 | err = btrfs_add_nondir(trans, dentry, inode); | |
134e9731 CM |
834 | if (err) |
835 | drop_inode = 1; | |
dee26a9f CM |
836 | else { |
837 | inode->i_mapping->a_ops = &btrfs_aops; | |
838 | inode->i_fop = &btrfs_file_operations; | |
839 | inode->i_op = &btrfs_file_inode_operations; | |
840 | } | |
d5719762 | 841 | dir->i_sb->s_dirt = 1; |
d561c025 | 842 | out_unlock: |
22b0ebda | 843 | btrfs_end_transaction(trans, root); |
d561c025 | 844 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 845 | |
134e9731 CM |
846 | if (drop_inode) { |
847 | inode_dec_link_count(inode); | |
848 | iput(inode); | |
849 | } | |
d5719762 CM |
850 | return err; |
851 | } | |
852 | ||
f7922033 | 853 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
2619ba1f CM |
854 | struct btrfs_root *root, |
855 | u64 objectid, u64 dirid) | |
f7922033 | 856 | { |
f7922033 CM |
857 | int ret; |
858 | char buf[2]; | |
d6e4a428 CM |
859 | struct btrfs_key key; |
860 | ||
f7922033 CM |
861 | buf[0] = '.'; |
862 | buf[1] = '.'; | |
863 | ||
2619ba1f | 864 | key.objectid = objectid; |
d6e4a428 CM |
865 | key.offset = 0; |
866 | key.flags = 0; | |
867 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
868 | ||
2619ba1f | 869 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
d6e4a428 | 870 | &key, 1); |
f7922033 CM |
871 | if (ret) |
872 | goto error; | |
2619ba1f CM |
873 | key.objectid = dirid; |
874 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
d6e4a428 | 875 | &key, 1); |
4730a4bc CM |
876 | if (ret) |
877 | goto error; | |
f7922033 CM |
878 | error: |
879 | return ret; | |
880 | } | |
881 | ||
882 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
883 | { | |
884 | struct inode *inode; | |
885 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 886 | struct btrfs_root *root = BTRFS_I(dir)->root; |
f7922033 CM |
887 | int err = 0; |
888 | int drop_on_err = 0; | |
2619ba1f | 889 | u64 objectid; |
f7922033 CM |
890 | |
891 | mutex_lock(&root->fs_info->fs_mutex); | |
892 | trans = btrfs_start_transaction(root, 1); | |
893 | if (IS_ERR(trans)) { | |
894 | err = PTR_ERR(trans); | |
895 | goto out_unlock; | |
896 | } | |
2619ba1f CM |
897 | |
898 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
899 | if (err) { | |
900 | err = -ENOSPC; | |
901 | goto out_unlock; | |
902 | } | |
903 | ||
904 | inode = btrfs_new_inode(trans, root, objectid, S_IFDIR | mode); | |
f7922033 CM |
905 | if (IS_ERR(inode)) { |
906 | err = PTR_ERR(inode); | |
907 | goto out_fail; | |
908 | } | |
909 | drop_on_err = 1; | |
910 | inode->i_op = &btrfs_dir_inode_operations; | |
911 | inode->i_fop = &btrfs_dir_file_operations; | |
912 | ||
2619ba1f CM |
913 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
914 | if (err) | |
915 | goto out_fail; | |
916 | ||
917 | inode->i_size = 6; | |
918 | err = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
919 | if (err) |
920 | goto out_fail; | |
921 | err = btrfs_add_link(trans, dentry, inode); | |
922 | if (err) | |
923 | goto out_fail; | |
924 | d_instantiate(dentry, inode); | |
f7922033 CM |
925 | drop_on_err = 0; |
926 | ||
927 | out_fail: | |
928 | btrfs_end_transaction(trans, root); | |
929 | out_unlock: | |
930 | mutex_unlock(&root->fs_info->fs_mutex); | |
931 | if (drop_on_err) | |
932 | iput(inode); | |
933 | return err; | |
934 | } | |
935 | ||
8fd17795 CM |
936 | static int btrfs_sync_file(struct file *file, |
937 | struct dentry *dentry, int datasync) | |
938 | { | |
939 | struct inode *inode = dentry->d_inode; | |
940 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
941 | int ret; | |
942 | struct btrfs_trans_handle *trans; | |
943 | ||
944 | mutex_lock(&root->fs_info->fs_mutex); | |
945 | trans = btrfs_start_transaction(root, 1); | |
946 | if (!trans) { | |
947 | ret = -ENOMEM; | |
948 | goto out; | |
949 | } | |
950 | ret = btrfs_commit_transaction(trans, root); | |
951 | mutex_unlock(&root->fs_info->fs_mutex); | |
952 | out: | |
953 | return ret > 0 ? EIO : ret; | |
954 | } | |
955 | ||
d5719762 CM |
956 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
957 | { | |
958 | struct btrfs_trans_handle *trans; | |
959 | struct btrfs_root *root; | |
960 | int ret; | |
d98237b3 | 961 | root = btrfs_sb(sb); |
df2ce34c | 962 | |
d5719762 | 963 | sb->s_dirt = 0; |
d561c025 | 964 | if (!wait) { |
7cfcc17e | 965 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
966 | return 0; |
967 | } | |
7cfcc17e | 968 | filemap_write_and_wait(root->fs_info->btree_inode->i_mapping); |
d561c025 | 969 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
970 | trans = btrfs_start_transaction(root, 1); |
971 | ret = btrfs_commit_transaction(trans, root); | |
972 | sb->s_dirt = 0; | |
973 | BUG_ON(ret); | |
974 | printk("btrfs sync_fs\n"); | |
d561c025 | 975 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
976 | return 0; |
977 | } | |
978 | ||
75dfe396 | 979 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
980 | struct buffer_head *result, int create) |
981 | { | |
982 | int ret; | |
983 | int err = 0; | |
984 | u64 blocknr; | |
985 | u64 extent_start = 0; | |
986 | u64 extent_end = 0; | |
987 | u64 objectid = inode->i_ino; | |
236454df | 988 | u32 found_type; |
5caf2a00 | 989 | struct btrfs_path *path; |
d6e4a428 | 990 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dee26a9f CM |
991 | struct btrfs_file_extent_item *item; |
992 | struct btrfs_leaf *leaf; | |
993 | struct btrfs_disk_key *found_key; | |
994 | ||
5caf2a00 CM |
995 | path = btrfs_alloc_path(); |
996 | BUG_ON(!path); | |
997 | btrfs_init_path(path); | |
6567e837 | 998 | if (create) { |
6567e837 CM |
999 | WARN_ON(1); |
1000 | } | |
dee26a9f | 1001 | |
236454df | 1002 | ret = btrfs_lookup_file_extent(NULL, root, path, |
9773a788 | 1003 | inode->i_ino, |
236454df | 1004 | iblock << inode->i_blkbits, 0); |
dee26a9f | 1005 | if (ret < 0) { |
dee26a9f CM |
1006 | err = ret; |
1007 | goto out; | |
1008 | } | |
1009 | ||
1010 | if (ret != 0) { | |
5caf2a00 CM |
1011 | if (path->slots[0] == 0) { |
1012 | btrfs_release_path(root, path); | |
236454df | 1013 | goto out; |
dee26a9f | 1014 | } |
5caf2a00 | 1015 | path->slots[0]--; |
dee26a9f CM |
1016 | } |
1017 | ||
5caf2a00 | 1018 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 1019 | struct btrfs_file_extent_item); |
5caf2a00 | 1020 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
1021 | blocknr = btrfs_file_extent_disk_blocknr(item); |
1022 | blocknr += btrfs_file_extent_offset(item); | |
1023 | ||
dee26a9f | 1024 | /* are we inside the extent that was found? */ |
5caf2a00 | 1025 | found_key = &leaf->items[path->slots[0]].key; |
236454df | 1026 | found_type = btrfs_disk_key_type(found_key); |
dee26a9f | 1027 | if (btrfs_disk_key_objectid(found_key) != objectid || |
236454df | 1028 | found_type != BTRFS_EXTENT_DATA_KEY) { |
dee26a9f CM |
1029 | extent_end = 0; |
1030 | extent_start = 0; | |
5caf2a00 | 1031 | btrfs_release_path(root, path); |
dee26a9f CM |
1032 | goto out; |
1033 | } | |
236454df CM |
1034 | found_type = btrfs_file_extent_type(item); |
1035 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1036 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1037 | extent_start = extent_start >> inode->i_blkbits; | |
1038 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
1039 | if (iblock >= extent_start && iblock < extent_end) { | |
1040 | err = 0; | |
1041 | btrfs_map_bh_to_logical(root, result, blocknr + | |
1042 | iblock - extent_start); | |
1043 | goto out; | |
1044 | } | |
1045 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1046 | char *ptr; | |
1047 | char *map; | |
1048 | u32 size; | |
1049 | size = btrfs_file_extent_inline_len(leaf->items + | |
1050 | path->slots[0]); | |
1051 | extent_end = (extent_start + size) >> inode->i_blkbits; | |
1052 | extent_start >>= inode->i_blkbits; | |
1053 | if (iblock < extent_start || iblock > extent_end) { | |
1054 | goto out; | |
1055 | } | |
1056 | ptr = btrfs_file_extent_inline_start(item); | |
1057 | map = kmap(result->b_page); | |
1058 | memcpy(map, ptr, size); | |
1059 | memset(map + size, 0, PAGE_CACHE_SIZE - size); | |
1060 | flush_dcache_page(result->b_page); | |
1061 | kunmap(result->b_page); | |
1062 | set_buffer_uptodate(result); | |
1063 | SetPageChecked(result->b_page); | |
1064 | btrfs_map_bh_to_logical(root, result, 0); | |
dee26a9f | 1065 | } |
dee26a9f | 1066 | out: |
5caf2a00 CM |
1067 | btrfs_release_path(root, path); |
1068 | btrfs_free_path(path); | |
75dfe396 CM |
1069 | return err; |
1070 | } | |
1071 | ||
1072 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1073 | struct buffer_head *result, int create) | |
1074 | { | |
1075 | int err; | |
d6e4a428 | 1076 | struct btrfs_root *root = BTRFS_I(inode)->root; |
75dfe396 | 1077 | mutex_lock(&root->fs_info->fs_mutex); |
e8f05c45 | 1078 | err = btrfs_get_block_lock(inode, iblock, result, create); |
dee26a9f CM |
1079 | mutex_unlock(&root->fs_info->fs_mutex); |
1080 | return err; | |
1081 | } | |
1082 | ||
1083 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1084 | unsigned from, unsigned to) | |
1085 | { | |
6407bf6d | 1086 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f CM |
1087 | } |
1088 | ||
d561c025 CM |
1089 | static void btrfs_write_super(struct super_block *sb) |
1090 | { | |
1091 | btrfs_sync_fs(sb, 1); | |
1092 | } | |
1093 | ||
dee26a9f CM |
1094 | static int btrfs_readpage(struct file *file, struct page *page) |
1095 | { | |
1096 | return mpage_readpage(page, btrfs_get_block); | |
1097 | } | |
1098 | ||
236454df CM |
1099 | /* |
1100 | * While block_write_full_page is writing back the dirty buffers under | |
1101 | * the page lock, whoever dirtied the buffers may decide to clean them | |
1102 | * again at any time. We handle that by only looking at the buffer | |
1103 | * state inside lock_buffer(). | |
1104 | * | |
1105 | * If block_write_full_page() is called for regular writeback | |
1106 | * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a | |
1107 | * locked buffer. This only can happen if someone has written the buffer | |
1108 | * directly, with submit_bh(). At the address_space level PageWriteback | |
1109 | * prevents this contention from occurring. | |
1110 | */ | |
1111 | static int __btrfs_write_full_page(struct inode *inode, struct page *page, | |
1112 | struct writeback_control *wbc) | |
1113 | { | |
1114 | int err; | |
1115 | sector_t block; | |
1116 | sector_t last_block; | |
1117 | struct buffer_head *bh, *head; | |
1118 | const unsigned blocksize = 1 << inode->i_blkbits; | |
1119 | int nr_underway = 0; | |
1120 | ||
1121 | BUG_ON(!PageLocked(page)); | |
1122 | ||
1123 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; | |
1124 | ||
1125 | if (!page_has_buffers(page)) { | |
1126 | create_empty_buffers(page, blocksize, | |
1127 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * Be very careful. We have no exclusion from __set_page_dirty_buffers | |
1132 | * here, and the (potentially unmapped) buffers may become dirty at | |
1133 | * any time. If a buffer becomes dirty here after we've inspected it | |
1134 | * then we just miss that fact, and the page stays dirty. | |
1135 | * | |
1136 | * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; | |
1137 | * handle that here by just cleaning them. | |
1138 | */ | |
1139 | ||
1140 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1141 | head = page_buffers(page); | |
1142 | bh = head; | |
1143 | ||
1144 | /* | |
1145 | * Get all the dirty buffers mapped to disk addresses and | |
1146 | * handle any aliases from the underlying blockdev's mapping. | |
1147 | */ | |
1148 | do { | |
1149 | if (block > last_block) { | |
1150 | /* | |
1151 | * mapped buffers outside i_size will occur, because | |
1152 | * this page can be outside i_size when there is a | |
1153 | * truncate in progress. | |
1154 | */ | |
1155 | /* | |
1156 | * The buffer was zeroed by block_write_full_page() | |
1157 | */ | |
1158 | clear_buffer_dirty(bh); | |
1159 | set_buffer_uptodate(bh); | |
1160 | } else if (!buffer_mapped(bh) && buffer_dirty(bh)) { | |
1161 | WARN_ON(bh->b_size != blocksize); | |
1162 | err = btrfs_get_block(inode, block, bh, 0); | |
1163 | if (err) | |
1164 | goto recover; | |
1165 | if (buffer_new(bh)) { | |
1166 | /* blockdev mappings never come here */ | |
1167 | clear_buffer_new(bh); | |
1168 | unmap_underlying_metadata(bh->b_bdev, | |
1169 | bh->b_blocknr); | |
1170 | } | |
1171 | } | |
1172 | bh = bh->b_this_page; | |
1173 | block++; | |
1174 | } while (bh != head); | |
1175 | ||
1176 | do { | |
1177 | if (!buffer_mapped(bh)) | |
1178 | continue; | |
1179 | /* | |
1180 | * If it's a fully non-blocking write attempt and we cannot | |
1181 | * lock the buffer then redirty the page. Note that this can | |
1182 | * potentially cause a busy-wait loop from pdflush and kswapd | |
1183 | * activity, but those code paths have their own higher-level | |
1184 | * throttling. | |
1185 | */ | |
1186 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
1187 | lock_buffer(bh); | |
1188 | } else if (test_set_buffer_locked(bh)) { | |
1189 | redirty_page_for_writepage(wbc, page); | |
1190 | continue; | |
1191 | } | |
1192 | if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) { | |
1193 | mark_buffer_async_write(bh); | |
1194 | } else { | |
1195 | unlock_buffer(bh); | |
1196 | } | |
1197 | } while ((bh = bh->b_this_page) != head); | |
1198 | ||
1199 | /* | |
1200 | * The page and its buffers are protected by PageWriteback(), so we can | |
1201 | * drop the bh refcounts early. | |
1202 | */ | |
1203 | BUG_ON(PageWriteback(page)); | |
1204 | set_page_writeback(page); | |
1205 | ||
1206 | do { | |
1207 | struct buffer_head *next = bh->b_this_page; | |
1208 | if (buffer_async_write(bh)) { | |
1209 | submit_bh(WRITE, bh); | |
1210 | nr_underway++; | |
1211 | } | |
1212 | bh = next; | |
1213 | } while (bh != head); | |
1214 | unlock_page(page); | |
1215 | ||
1216 | err = 0; | |
1217 | done: | |
1218 | if (nr_underway == 0) { | |
1219 | /* | |
1220 | * The page was marked dirty, but the buffers were | |
1221 | * clean. Someone wrote them back by hand with | |
1222 | * ll_rw_block/submit_bh. A rare case. | |
1223 | */ | |
1224 | int uptodate = 1; | |
1225 | do { | |
1226 | if (!buffer_uptodate(bh)) { | |
1227 | uptodate = 0; | |
1228 | break; | |
1229 | } | |
1230 | bh = bh->b_this_page; | |
1231 | } while (bh != head); | |
1232 | if (uptodate) | |
1233 | SetPageUptodate(page); | |
1234 | end_page_writeback(page); | |
1235 | /* | |
1236 | * The page and buffer_heads can be released at any time from | |
1237 | * here on. | |
1238 | */ | |
1239 | wbc->pages_skipped++; /* We didn't write this page */ | |
1240 | } | |
1241 | return err; | |
1242 | ||
1243 | recover: | |
1244 | /* | |
1245 | * ENOSPC, or some other error. We may already have added some | |
1246 | * blocks to the file, so we need to write these out to avoid | |
1247 | * exposing stale data. | |
1248 | * The page is currently locked and not marked for writeback | |
1249 | */ | |
1250 | bh = head; | |
1251 | /* Recovery: lock and submit the mapped buffers */ | |
1252 | do { | |
1253 | if (buffer_mapped(bh) && buffer_dirty(bh)) { | |
1254 | lock_buffer(bh); | |
1255 | mark_buffer_async_write(bh); | |
1256 | } else { | |
1257 | /* | |
1258 | * The buffer may have been set dirty during | |
1259 | * attachment to a dirty page. | |
1260 | */ | |
1261 | clear_buffer_dirty(bh); | |
1262 | } | |
1263 | } while ((bh = bh->b_this_page) != head); | |
1264 | SetPageError(page); | |
1265 | BUG_ON(PageWriteback(page)); | |
1266 | set_page_writeback(page); | |
1267 | do { | |
1268 | struct buffer_head *next = bh->b_this_page; | |
1269 | if (buffer_async_write(bh)) { | |
1270 | clear_buffer_dirty(bh); | |
1271 | submit_bh(WRITE, bh); | |
1272 | nr_underway++; | |
1273 | } | |
1274 | bh = next; | |
1275 | } while (bh != head); | |
1276 | unlock_page(page); | |
1277 | goto done; | |
1278 | } | |
1279 | ||
1280 | /* | |
1281 | * The generic ->writepage function for buffer-backed address_spaces | |
1282 | */ | |
dee26a9f CM |
1283 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
1284 | { | |
236454df CM |
1285 | struct inode * const inode = page->mapping->host; |
1286 | loff_t i_size = i_size_read(inode); | |
1287 | const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
1288 | unsigned offset; | |
1289 | void *kaddr; | |
1290 | ||
1291 | /* Is the page fully inside i_size? */ | |
1292 | if (page->index < end_index) | |
1293 | return __btrfs_write_full_page(inode, page, wbc); | |
1294 | ||
1295 | /* Is the page fully outside i_size? (truncate in progress) */ | |
1296 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
1297 | if (page->index >= end_index+1 || !offset) { | |
1298 | /* | |
1299 | * The page may have dirty, unmapped buffers. For example, | |
1300 | * they may have been added in ext3_writepage(). Make them | |
1301 | * freeable here, so the page does not leak. | |
1302 | */ | |
1303 | block_invalidatepage(page, 0); | |
1304 | unlock_page(page); | |
1305 | return 0; /* don't care */ | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * The page straddles i_size. It must be zeroed out on each and every | |
1310 | * writepage invokation because it may be mmapped. "A file is mapped | |
1311 | * in multiples of the page size. For a file that is not a multiple of | |
1312 | * the page size, the remaining memory is zeroed when mapped, and | |
1313 | * writes to that region are not written out to the file." | |
1314 | */ | |
1315 | kaddr = kmap_atomic(page, KM_USER0); | |
1316 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1317 | flush_dcache_page(page); | |
1318 | kunmap_atomic(kaddr, KM_USER0); | |
1319 | return __btrfs_write_full_page(inode, page, wbc); | |
dee26a9f | 1320 | } |
d561c025 | 1321 | |
f4b9aa8d CM |
1322 | static void btrfs_truncate(struct inode *inode) |
1323 | { | |
d6e4a428 | 1324 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
1325 | int ret; |
1326 | struct btrfs_trans_handle *trans; | |
1327 | ||
1328 | if (!S_ISREG(inode->i_mode)) | |
1329 | return; | |
1330 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1331 | return; | |
1332 | ||
e8f05c45 | 1333 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d CM |
1334 | |
1335 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1336 | mutex_lock(&root->fs_info->fs_mutex); | |
1337 | trans = btrfs_start_transaction(root, 1); | |
1338 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
1339 | BUG_ON(ret); | |
1340 | ret = btrfs_end_transaction(trans, root); | |
1341 | BUG_ON(ret); | |
1342 | mutex_unlock(&root->fs_info->fs_mutex); | |
1343 | mark_inode_dirty(inode); | |
1344 | } | |
1345 | ||
236454df CM |
1346 | /* |
1347 | * Make sure any changes to nobh_commit_write() are reflected in | |
1348 | * nobh_truncate_page(), since it doesn't call commit_write(). | |
1349 | */ | |
1350 | static int btrfs_commit_write(struct file *file, struct page *page, | |
1351 | unsigned from, unsigned to) | |
1352 | { | |
1353 | struct inode *inode = page->mapping->host; | |
1354 | struct buffer_head *bh; | |
1355 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1356 | ||
1357 | SetPageUptodate(page); | |
1358 | bh = page_buffers(page); | |
1359 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { | |
1360 | set_page_dirty(page); | |
1361 | } | |
1362 | if (pos > inode->i_size) { | |
1363 | i_size_write(inode, pos); | |
1364 | mark_inode_dirty(inode); | |
1365 | } | |
1366 | return 0; | |
1367 | } | |
1368 | ||
75dfe396 CM |
1369 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1370 | struct page **prepared_pages, | |
1371 | const char __user * buf) | |
1372 | { | |
1373 | long page_fault = 0; | |
1374 | int i; | |
1375 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1376 | ||
1377 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1378 | size_t count = min_t(size_t, | |
1379 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1380 | struct page *page = prepared_pages[i]; | |
1381 | fault_in_pages_readable(buf, count); | |
1382 | ||
1383 | /* Copy data from userspace to the current page */ | |
1384 | kmap(page); | |
1385 | page_fault = __copy_from_user(page_address(page) + offset, | |
1386 | buf, count); | |
1387 | /* Flush processor's dcache for this page */ | |
1388 | flush_dcache_page(page); | |
1389 | kunmap(page); | |
1390 | buf += count; | |
1391 | write_bytes -= count; | |
1392 | ||
1393 | if (page_fault) | |
1394 | break; | |
1395 | } | |
1396 | return page_fault ? -EFAULT : 0; | |
1397 | } | |
1398 | ||
1399 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1400 | { | |
1401 | size_t i; | |
1402 | for (i = 0; i < num_pages; i++) { | |
1403 | if (!pages[i]) | |
1404 | break; | |
1405 | unlock_page(pages[i]); | |
1406 | mark_page_accessed(pages[i]); | |
1407 | page_cache_release(pages[i]); | |
1408 | } | |
1409 | } | |
1410 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1411 | struct btrfs_root *root, | |
1412 | struct file *file, | |
1413 | struct page **pages, | |
1414 | size_t num_pages, | |
1415 | loff_t pos, | |
1416 | size_t write_bytes) | |
1417 | { | |
1418 | int i; | |
1419 | int offset; | |
1420 | int err = 0; | |
1421 | int ret; | |
1422 | int this_write; | |
f254e52c | 1423 | struct inode *inode = file->f_path.dentry->d_inode; |
236454df CM |
1424 | struct buffer_head *bh; |
1425 | struct btrfs_file_extent_item *ei; | |
75dfe396 CM |
1426 | |
1427 | for (i = 0; i < num_pages; i++) { | |
1428 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1429 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1430 | /* FIXME, one block at a time */ |
1431 | ||
1432 | mutex_lock(&root->fs_info->fs_mutex); | |
1433 | trans = btrfs_start_transaction(root, 1); | |
236454df CM |
1434 | |
1435 | bh = page_buffers(pages[i]); | |
1436 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
1437 | struct btrfs_key key; | |
1438 | struct btrfs_path *path; | |
1439 | char *ptr; | |
1440 | u32 datasize; | |
1441 | ||
1442 | path = btrfs_alloc_path(); | |
1443 | BUG_ON(!path); | |
1444 | key.objectid = inode->i_ino; | |
1445 | key.offset = pages[i]->index << PAGE_CACHE_SHIFT; | |
1446 | key.flags = 0; | |
1447 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
1448 | BUG_ON(write_bytes >= PAGE_CACHE_SIZE); | |
1449 | datasize = offset + | |
1450 | btrfs_file_extent_calc_inline_size(write_bytes); | |
1451 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1452 | datasize); | |
1453 | BUG_ON(ret); | |
1454 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1455 | path->slots[0], struct btrfs_file_extent_item); | |
1456 | btrfs_set_file_extent_generation(ei, trans->transid); | |
1457 | btrfs_set_file_extent_type(ei, | |
1458 | BTRFS_FILE_EXTENT_INLINE); | |
1459 | ptr = btrfs_file_extent_inline_start(ei); | |
1460 | memcpy(ptr, bh->b_data, offset + write_bytes); | |
1461 | mark_buffer_dirty(path->nodes[0]); | |
1462 | btrfs_free_path(path); | |
1463 | } else { | |
1464 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
f254e52c CM |
1465 | pages[i]->index << PAGE_CACHE_SHIFT, |
1466 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
236454df CM |
1467 | kunmap(pages[i]); |
1468 | } | |
f254e52c CM |
1469 | SetPageChecked(pages[i]); |
1470 | ret = btrfs_end_transaction(trans, root); | |
1471 | BUG_ON(ret); | |
1472 | mutex_unlock(&root->fs_info->fs_mutex); | |
1473 | ||
236454df | 1474 | ret = btrfs_commit_write(file, pages[i], offset, |
75dfe396 CM |
1475 | offset + this_write); |
1476 | pos += this_write; | |
1477 | if (ret) { | |
1478 | err = ret; | |
1479 | goto failed; | |
1480 | } | |
1481 | WARN_ON(this_write > write_bytes); | |
1482 | write_bytes -= this_write; | |
1483 | } | |
1484 | failed: | |
1485 | return err; | |
1486 | } | |
1487 | ||
b18c6685 CM |
1488 | static int drop_extents(struct btrfs_trans_handle *trans, |
1489 | struct btrfs_root *root, | |
1490 | struct inode *inode, | |
1491 | u64 start, u64 end) | |
1492 | { | |
1493 | int ret; | |
1494 | struct btrfs_key key; | |
1495 | struct btrfs_leaf *leaf; | |
1496 | int slot; | |
1497 | struct btrfs_file_extent_item *extent; | |
236454df | 1498 | u64 extent_end = 0; |
b18c6685 CM |
1499 | int keep; |
1500 | struct btrfs_file_extent_item old; | |
1501 | struct btrfs_path *path; | |
1502 | u64 search_start = start; | |
1503 | int bookend; | |
236454df CM |
1504 | int found_type; |
1505 | int found_extent; | |
1506 | int found_inline; | |
1507 | ||
b18c6685 CM |
1508 | path = btrfs_alloc_path(); |
1509 | if (!path) | |
1510 | return -ENOMEM; | |
a429e513 CM |
1511 | while(1) { |
1512 | btrfs_release_path(root, path); | |
1513 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
1514 | search_start, -1); | |
1515 | if (ret < 0) | |
70b2befd | 1516 | goto out; |
a429e513 CM |
1517 | if (ret > 0) { |
1518 | if (path->slots[0] == 0) { | |
236454df | 1519 | ret = 0; |
a429e513 CM |
1520 | goto out; |
1521 | } | |
1522 | path->slots[0]--; | |
70b2befd | 1523 | } |
b18c6685 CM |
1524 | keep = 0; |
1525 | bookend = 0; | |
236454df CM |
1526 | found_extent = 0; |
1527 | found_inline = 0; | |
1528 | extent = NULL; | |
b18c6685 CM |
1529 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
1530 | slot = path->slots[0]; | |
1531 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
b18c6685 CM |
1532 | if (key.offset >= end || key.objectid != inode->i_ino) { |
1533 | ret = 0; | |
1534 | goto out; | |
1535 | } | |
236454df CM |
1536 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) { |
1537 | ret = 0; | |
1538 | goto out; | |
1539 | } | |
1540 | extent = btrfs_item_ptr(leaf, slot, | |
1541 | struct btrfs_file_extent_item); | |
1542 | found_type = btrfs_file_extent_type(extent); | |
1543 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1544 | extent_end = key.offset + | |
1545 | (btrfs_file_extent_num_blocks(extent) << | |
1546 | inode->i_blkbits); | |
1547 | found_extent = 1; | |
1548 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1549 | found_inline = 1; | |
1550 | extent_end = key.offset + | |
1551 | btrfs_file_extent_inline_len(leaf->items + slot); | |
1552 | } | |
1553 | ||
1554 | if (!found_extent && !found_inline) { | |
1555 | ret = 0; | |
a429e513 | 1556 | goto out; |
236454df CM |
1557 | } |
1558 | ||
1559 | if (search_start >= extent_end) { | |
1560 | ret = 0; | |
a429e513 | 1561 | goto out; |
236454df CM |
1562 | } |
1563 | ||
a429e513 | 1564 | search_start = extent_end; |
b18c6685 CM |
1565 | |
1566 | if (end < extent_end && end >= key.offset) { | |
236454df CM |
1567 | if (found_extent) { |
1568 | memcpy(&old, extent, sizeof(old)); | |
1569 | ret = btrfs_inc_extent_ref(trans, root, | |
1570 | btrfs_file_extent_disk_blocknr(&old), | |
1571 | btrfs_file_extent_disk_num_blocks(&old)); | |
1572 | BUG_ON(ret); | |
1573 | } | |
1574 | WARN_ON(found_inline); | |
b18c6685 CM |
1575 | bookend = 1; |
1576 | } | |
1577 | ||
1578 | if (start > key.offset) { | |
1579 | u64 new_num; | |
a429e513 | 1580 | u64 old_num; |
b18c6685 CM |
1581 | /* truncate existing extent */ |
1582 | keep = 1; | |
1583 | WARN_ON(start & (root->blocksize - 1)); | |
236454df CM |
1584 | if (found_extent) { |
1585 | new_num = (start - key.offset) >> | |
1586 | inode->i_blkbits; | |
1587 | old_num = btrfs_file_extent_num_blocks(extent); | |
1588 | inode->i_blocks -= (old_num - new_num) << 3; | |
1589 | btrfs_set_file_extent_num_blocks(extent, | |
1590 | new_num); | |
1591 | mark_buffer_dirty(path->nodes[0]); | |
1592 | } else { | |
1593 | WARN_ON(1); | |
1594 | /* | |
1595 | ret = btrfs_truncate_item(trans, root, path, | |
1596 | start - key.offset); | |
1597 | BUG_ON(ret); | |
1598 | */ | |
1599 | } | |
b18c6685 CM |
1600 | } |
1601 | if (!keep) { | |
236454df CM |
1602 | u64 disk_blocknr = 0; |
1603 | u64 disk_num_blocks = 0; | |
1604 | u64 extent_num_blocks = 0; | |
1605 | if (found_extent) { | |
1606 | disk_blocknr = | |
1607 | btrfs_file_extent_disk_blocknr(extent); | |
1608 | disk_num_blocks = | |
1609 | btrfs_file_extent_disk_num_blocks(extent); | |
1610 | extent_num_blocks = | |
1611 | btrfs_file_extent_num_blocks(extent); | |
1612 | } | |
b18c6685 CM |
1613 | ret = btrfs_del_item(trans, root, path); |
1614 | BUG_ON(ret); | |
1615 | btrfs_release_path(root, path); | |
236454df CM |
1616 | if (found_extent) { |
1617 | inode->i_blocks -= | |
1618 | btrfs_file_extent_num_blocks(extent) << 3; | |
1619 | ret = btrfs_free_extent(trans, root, | |
1620 | disk_blocknr, | |
1621 | disk_num_blocks, 0); | |
1622 | } | |
b18c6685 CM |
1623 | |
1624 | BUG_ON(ret); | |
1625 | if (!bookend && search_start >= end) { | |
1626 | ret = 0; | |
1627 | goto out; | |
1628 | } | |
1629 | if (!bookend) | |
a429e513 | 1630 | continue; |
b18c6685 | 1631 | } |
236454df | 1632 | if (bookend && found_extent) { |
b18c6685 CM |
1633 | /* create bookend */ |
1634 | struct btrfs_key ins; | |
b18c6685 CM |
1635 | ins.objectid = inode->i_ino; |
1636 | ins.offset = end; | |
1637 | ins.flags = 0; | |
1638 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); | |
1639 | ||
1640 | btrfs_release_path(root, path); | |
b18c6685 CM |
1641 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
1642 | sizeof(*extent)); | |
1643 | BUG_ON(ret); | |
1644 | extent = btrfs_item_ptr( | |
1645 | btrfs_buffer_leaf(path->nodes[0]), | |
1646 | path->slots[0], | |
1647 | struct btrfs_file_extent_item); | |
1648 | btrfs_set_file_extent_disk_blocknr(extent, | |
1649 | btrfs_file_extent_disk_blocknr(&old)); | |
1650 | btrfs_set_file_extent_disk_num_blocks(extent, | |
1651 | btrfs_file_extent_disk_num_blocks(&old)); | |
1652 | ||
1653 | btrfs_set_file_extent_offset(extent, | |
1654 | btrfs_file_extent_offset(&old) + | |
1655 | ((end - key.offset) >> inode->i_blkbits)); | |
1656 | WARN_ON(btrfs_file_extent_num_blocks(&old) < | |
1657 | (end - key.offset) >> inode->i_blkbits); | |
1658 | btrfs_set_file_extent_num_blocks(extent, | |
1659 | btrfs_file_extent_num_blocks(&old) - | |
1660 | ((end - key.offset) >> inode->i_blkbits)); | |
1661 | ||
236454df CM |
1662 | btrfs_set_file_extent_type(extent, |
1663 | BTRFS_FILE_EXTENT_REG); | |
b18c6685 CM |
1664 | btrfs_set_file_extent_generation(extent, |
1665 | btrfs_file_extent_generation(&old)); | |
b18c6685 | 1666 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a429e513 CM |
1667 | inode->i_blocks += |
1668 | btrfs_file_extent_num_blocks(extent) << 3; | |
b18c6685 | 1669 | ret = 0; |
70b2befd | 1670 | goto out; |
b18c6685 | 1671 | } |
b18c6685 | 1672 | } |
b18c6685 | 1673 | out: |
b18c6685 CM |
1674 | btrfs_free_path(path); |
1675 | return ret; | |
1676 | } | |
1677 | ||
1678 | static int prepare_pages(struct btrfs_root *root, | |
75dfe396 CM |
1679 | struct file *file, |
1680 | struct page **pages, | |
1681 | size_t num_pages, | |
1682 | loff_t pos, | |
2932f3ec CM |
1683 | unsigned long first_index, |
1684 | unsigned long last_index, | |
6567e837 CM |
1685 | size_t write_bytes, |
1686 | u64 alloc_extent_start) | |
75dfe396 CM |
1687 | { |
1688 | int i; | |
1689 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
1690 | struct inode *inode = file->f_path.dentry->d_inode; | |
1691 | int offset; | |
1692 | int err = 0; | |
75dfe396 | 1693 | int this_write; |
6567e837 CM |
1694 | struct buffer_head *bh; |
1695 | struct buffer_head *head; | |
75dfe396 CM |
1696 | loff_t isize = i_size_read(inode); |
1697 | ||
1698 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
1699 | ||
1700 | for (i = 0; i < num_pages; i++) { | |
1701 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
1702 | if (!pages[i]) { | |
1703 | err = -ENOMEM; | |
1704 | goto failed_release; | |
1705 | } | |
1706 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1707 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
6567e837 CM |
1708 | create_empty_buffers(pages[i], root->fs_info->sb->s_blocksize, |
1709 | (1 << BH_Uptodate)); | |
1710 | head = page_buffers(pages[i]); | |
1711 | bh = head; | |
1712 | do { | |
1713 | err = btrfs_map_bh_to_logical(root, bh, | |
1714 | alloc_extent_start); | |
1715 | BUG_ON(err); | |
1716 | if (err) | |
1717 | goto failed_truncate; | |
1718 | bh = bh->b_this_page; | |
236454df CM |
1719 | if (alloc_extent_start) |
1720 | alloc_extent_start++; | |
6567e837 | 1721 | } while (bh != head); |
75dfe396 | 1722 | pos += this_write; |
75dfe396 CM |
1723 | WARN_ON(this_write > write_bytes); |
1724 | write_bytes -= this_write; | |
1725 | } | |
1726 | return 0; | |
1727 | ||
1728 | failed_release: | |
1729 | btrfs_drop_pages(pages, num_pages); | |
1730 | return err; | |
1731 | ||
1732 | failed_truncate: | |
1733 | btrfs_drop_pages(pages, num_pages); | |
1734 | if (pos > isize) | |
1735 | vmtruncate(inode, isize); | |
1736 | return err; | |
1737 | } | |
1738 | ||
1739 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
1740 | size_t count, loff_t *ppos) | |
1741 | { | |
1742 | loff_t pos; | |
1743 | size_t num_written = 0; | |
1744 | int err = 0; | |
1745 | int ret = 0; | |
75dfe396 | 1746 | struct inode *inode = file->f_path.dentry->d_inode; |
d6e4a428 | 1747 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b18c6685 | 1748 | struct page *pages[8]; |
a429e513 | 1749 | struct page *pinned[2] = { NULL, NULL }; |
2932f3ec CM |
1750 | unsigned long first_index; |
1751 | unsigned long last_index; | |
6567e837 CM |
1752 | u64 start_pos; |
1753 | u64 num_blocks; | |
1754 | u64 alloc_extent_start; | |
6567e837 | 1755 | struct btrfs_trans_handle *trans; |
b18c6685 | 1756 | struct btrfs_key ins; |
75dfe396 CM |
1757 | |
1758 | if (file->f_flags & O_DIRECT) | |
1759 | return -EINVAL; | |
1760 | pos = *ppos; | |
75dfe396 CM |
1761 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
1762 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1763 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1764 | if (err) | |
1765 | goto out; | |
1766 | if (count == 0) | |
1767 | goto out; | |
1768 | err = remove_suid(file->f_path.dentry); | |
1769 | if (err) | |
1770 | goto out; | |
1771 | file_update_time(file); | |
a429e513 CM |
1772 | |
1773 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); | |
1774 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> | |
1775 | inode->i_blkbits; | |
1776 | ||
75dfe396 | 1777 | mutex_lock(&inode->i_mutex); |
2932f3ec CM |
1778 | first_index = pos >> PAGE_CACHE_SHIFT; |
1779 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
6567e837 | 1780 | |
a429e513 CM |
1781 | if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size && |
1782 | (pos & (PAGE_CACHE_SIZE - 1))) { | |
1783 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); | |
1784 | if (!PageUptodate(pinned[0])) { | |
1785 | ret = mpage_readpage(pinned[0], btrfs_get_block); | |
1786 | BUG_ON(ret); | |
1787 | } else { | |
1788 | unlock_page(pinned[0]); | |
1789 | } | |
1790 | } | |
1791 | if (first_index != last_index && | |
1792 | (last_index << PAGE_CACHE_SHIFT) < inode->i_size && | |
1793 | (count & (PAGE_CACHE_SIZE - 1))) { | |
1794 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); | |
1795 | if (!PageUptodate(pinned[1])) { | |
1796 | ret = mpage_readpage(pinned[1], btrfs_get_block); | |
1797 | BUG_ON(ret); | |
1798 | } else { | |
1799 | unlock_page(pinned[1]); | |
1800 | } | |
1801 | } | |
1802 | ||
6567e837 CM |
1803 | mutex_lock(&root->fs_info->fs_mutex); |
1804 | trans = btrfs_start_transaction(root, 1); | |
1805 | if (!trans) { | |
1806 | err = -ENOMEM; | |
b18c6685 | 1807 | mutex_unlock(&root->fs_info->fs_mutex); |
6567e837 CM |
1808 | goto out_unlock; |
1809 | } | |
a429e513 CM |
1810 | /* FIXME blocksize != 4096 */ |
1811 | inode->i_blocks += num_blocks << 3; | |
b18c6685 | 1812 | if (start_pos < inode->i_size) { |
a429e513 | 1813 | /* FIXME blocksize != pagesize */ |
b18c6685 CM |
1814 | ret = drop_extents(trans, root, inode, |
1815 | start_pos, | |
1816 | (pos + count + root->blocksize -1) & | |
a429e513 | 1817 | ~((u64)root->blocksize - 1)); |
236454df | 1818 | BUG_ON(ret); |
b18c6685 | 1819 | } |
236454df CM |
1820 | if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size || |
1821 | pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) { | |
1822 | ret = btrfs_alloc_extent(trans, root, num_blocks, 1, | |
b18c6685 | 1823 | (u64)-1, &ins); |
236454df CM |
1824 | BUG_ON(ret); |
1825 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
b18c6685 | 1826 | start_pos, ins.objectid, ins.offset); |
236454df CM |
1827 | BUG_ON(ret); |
1828 | } else { | |
1829 | ins.offset = 0; | |
1830 | ins.objectid = 0; | |
1831 | } | |
6567e837 | 1832 | BUG_ON(ret); |
b18c6685 CM |
1833 | alloc_extent_start = ins.objectid; |
1834 | ret = btrfs_end_transaction(trans, root); | |
6567e837 CM |
1835 | mutex_unlock(&root->fs_info->fs_mutex); |
1836 | ||
75dfe396 CM |
1837 | while(count > 0) { |
1838 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1839 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1840 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
1841 | PAGE_CACHE_SHIFT; | |
b18c6685 CM |
1842 | |
1843 | memset(pages, 0, sizeof(pages)); | |
1844 | ret = prepare_pages(root, file, pages, num_pages, | |
6567e837 CM |
1845 | pos, first_index, last_index, |
1846 | write_bytes, alloc_extent_start); | |
75dfe396 | 1847 | BUG_ON(ret); |
b18c6685 | 1848 | |
6567e837 | 1849 | /* FIXME blocks != pagesize */ |
236454df CM |
1850 | if (alloc_extent_start) |
1851 | alloc_extent_start += num_pages; | |
75dfe396 CM |
1852 | ret = btrfs_copy_from_user(pos, num_pages, |
1853 | write_bytes, pages, buf); | |
1854 | BUG_ON(ret); | |
1855 | ||
f254e52c | 1856 | ret = dirty_and_release_pages(NULL, root, file, pages, |
70b2befd | 1857 | num_pages, pos, write_bytes); |
75dfe396 CM |
1858 | BUG_ON(ret); |
1859 | btrfs_drop_pages(pages, num_pages); | |
1860 | ||
75dfe396 CM |
1861 | buf += write_bytes; |
1862 | count -= write_bytes; | |
1863 | pos += write_bytes; | |
1864 | num_written += write_bytes; | |
1865 | ||
1866 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
1867 | cond_resched(); | |
1868 | } | |
6567e837 | 1869 | out_unlock: |
75dfe396 CM |
1870 | mutex_unlock(&inode->i_mutex); |
1871 | out: | |
a429e513 CM |
1872 | if (pinned[0]) |
1873 | page_cache_release(pinned[0]); | |
1874 | if (pinned[1]) | |
1875 | page_cache_release(pinned[1]); | |
75dfe396 CM |
1876 | *ppos = pos; |
1877 | current->backing_dev_info = NULL; | |
a429e513 | 1878 | mark_inode_dirty(inode); |
75dfe396 CM |
1879 | return num_written ? num_written : err; |
1880 | } | |
1881 | ||
f254e52c CM |
1882 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
1883 | unsigned long offset, unsigned long size) | |
1884 | { | |
1885 | char *kaddr; | |
1886 | unsigned long left, count = desc->count; | |
d6e4a428 | 1887 | struct inode *inode = page->mapping->host; |
f254e52c CM |
1888 | |
1889 | if (size > count) | |
1890 | size = count; | |
1891 | ||
1892 | if (!PageChecked(page)) { | |
1893 | /* FIXME, do it per block */ | |
d6e4a428 | 1894 | struct btrfs_root *root = BTRFS_I(inode)->root; |
236454df | 1895 | |
f254e52c | 1896 | int ret = btrfs_csum_verify_file_block(root, |
236454df CM |
1897 | page->mapping->host->i_ino, |
1898 | page->index << PAGE_CACHE_SHIFT, | |
1899 | kmap(page), PAGE_CACHE_SIZE); | |
f254e52c CM |
1900 | if (ret) { |
1901 | printk("failed to verify ino %lu page %lu\n", | |
1902 | page->mapping->host->i_ino, | |
1903 | page->index); | |
1904 | memset(page_address(page), 0, PAGE_CACHE_SIZE); | |
1905 | } | |
1906 | SetPageChecked(page); | |
1907 | kunmap(page); | |
1908 | } | |
1909 | /* | |
1910 | * Faults on the destination of a read are common, so do it before | |
1911 | * taking the kmap. | |
1912 | */ | |
1913 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
1914 | kaddr = kmap_atomic(page, KM_USER0); | |
1915 | left = __copy_to_user_inatomic(desc->arg.buf, | |
1916 | kaddr + offset, size); | |
1917 | kunmap_atomic(kaddr, KM_USER0); | |
1918 | if (left == 0) | |
1919 | goto success; | |
1920 | } | |
1921 | ||
1922 | /* Do it the slow way */ | |
1923 | kaddr = kmap(page); | |
1924 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
1925 | kunmap(page); | |
1926 | ||
1927 | if (left) { | |
1928 | size -= left; | |
1929 | desc->error = -EFAULT; | |
1930 | } | |
1931 | success: | |
1932 | desc->count = count - size; | |
1933 | desc->written += size; | |
1934 | desc->arg.buf += size; | |
1935 | return size; | |
1936 | } | |
1937 | ||
1938 | /** | |
1939 | * btrfs_file_aio_read - filesystem read routine | |
1940 | * @iocb: kernel I/O control block | |
1941 | * @iov: io vector request | |
1942 | * @nr_segs: number of segments in the iovec | |
1943 | * @pos: current file position | |
1944 | */ | |
1945 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
1946 | unsigned long nr_segs, loff_t pos) | |
1947 | { | |
1948 | struct file *filp = iocb->ki_filp; | |
1949 | ssize_t retval; | |
1950 | unsigned long seg; | |
1951 | size_t count; | |
1952 | loff_t *ppos = &iocb->ki_pos; | |
1953 | ||
1954 | count = 0; | |
1955 | for (seg = 0; seg < nr_segs; seg++) { | |
1956 | const struct iovec *iv = &iov[seg]; | |
1957 | ||
1958 | /* | |
1959 | * If any segment has a negative length, or the cumulative | |
1960 | * length ever wraps negative then return -EINVAL. | |
1961 | */ | |
1962 | count += iv->iov_len; | |
1963 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
1964 | return -EINVAL; | |
1965 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
1966 | continue; | |
1967 | if (seg == 0) | |
1968 | return -EFAULT; | |
1969 | nr_segs = seg; | |
1970 | count -= iv->iov_len; /* This segment is no good */ | |
1971 | break; | |
1972 | } | |
1973 | retval = 0; | |
1974 | if (count) { | |
1975 | for (seg = 0; seg < nr_segs; seg++) { | |
1976 | read_descriptor_t desc; | |
1977 | ||
1978 | desc.written = 0; | |
1979 | desc.arg.buf = iov[seg].iov_base; | |
1980 | desc.count = iov[seg].iov_len; | |
1981 | if (desc.count == 0) | |
1982 | continue; | |
1983 | desc.error = 0; | |
1984 | do_generic_file_read(filp, ppos, &desc, | |
1985 | btrfs_read_actor); | |
1986 | retval += desc.written; | |
1987 | if (desc.error) { | |
1988 | retval = retval ?: desc.error; | |
1989 | break; | |
1990 | } | |
1991 | } | |
1992 | } | |
1993 | return retval; | |
1994 | } | |
1995 | ||
2619ba1f CM |
1996 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
1997 | { | |
1998 | struct btrfs_trans_handle *trans; | |
1999 | struct btrfs_key key; | |
2000 | struct btrfs_root_item root_item; | |
2001 | struct btrfs_inode_item *inode_item; | |
2002 | struct buffer_head *subvol; | |
2003 | struct btrfs_leaf *leaf; | |
2004 | struct btrfs_root *new_root; | |
2005 | struct inode *inode; | |
2006 | int ret; | |
2007 | u64 objectid; | |
2008 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
2009 | ||
2010 | mutex_lock(&root->fs_info->fs_mutex); | |
2011 | trans = btrfs_start_transaction(root, 1); | |
2012 | BUG_ON(!trans); | |
2013 | ||
2014 | subvol = btrfs_alloc_free_block(trans, root); | |
2015 | leaf = btrfs_buffer_leaf(subvol); | |
2016 | btrfs_set_header_nritems(&leaf->header, 0); | |
2017 | btrfs_set_header_level(&leaf->header, 0); | |
7eccb903 | 2018 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
2619ba1f CM |
2019 | btrfs_set_header_generation(&leaf->header, trans->transid); |
2020 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, | |
2021 | sizeof(leaf->header.fsid)); | |
2022 | ||
2023 | inode_item = &root_item.inode; | |
2024 | memset(inode_item, 0, sizeof(*inode_item)); | |
2025 | btrfs_set_inode_generation(inode_item, 1); | |
2026 | btrfs_set_inode_size(inode_item, 3); | |
2027 | btrfs_set_inode_nlink(inode_item, 1); | |
2028 | btrfs_set_inode_nblocks(inode_item, 1); | |
2029 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
2030 | ||
7eccb903 | 2031 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
2619ba1f CM |
2032 | btrfs_set_root_refs(&root_item, 1); |
2033 | ||
2034 | mark_buffer_dirty(subvol); | |
2035 | brelse(subvol); | |
2036 | subvol = NULL; | |
2037 | ||
2038 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
2039 | 0, &objectid); | |
2040 | BUG_ON(ret); | |
2041 | ||
2042 | btrfs_set_root_dirid(&root_item, new_dirid); | |
2043 | ||
2044 | key.objectid = objectid; | |
2045 | key.offset = 1; | |
2046 | key.flags = 0; | |
2047 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
2048 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2049 | &root_item); | |
2050 | BUG_ON(ret); | |
2051 | ||
2052 | /* | |
2053 | * insert the directory item | |
2054 | */ | |
2055 | key.offset = (u64)-1; | |
2056 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2057 | name, namelen, | |
2058 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2059 | &key, 0); | |
2060 | BUG_ON(ret); | |
2061 | ||
2062 | ret = btrfs_commit_transaction(trans, root); | |
2063 | BUG_ON(ret); | |
2064 | ||
2065 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
2066 | BUG_ON(!new_root); | |
2067 | ||
2068 | trans = btrfs_start_transaction(new_root, 1); | |
2069 | BUG_ON(!trans); | |
2070 | ||
2071 | inode = btrfs_new_inode(trans, new_root, new_dirid, S_IFDIR | 0700); | |
2072 | inode->i_op = &btrfs_dir_inode_operations; | |
2073 | inode->i_fop = &btrfs_dir_file_operations; | |
2074 | ||
2075 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
2076 | BUG_ON(ret); | |
2077 | ||
2078 | inode->i_nlink = 1; | |
2079 | inode->i_size = 6; | |
2080 | ret = btrfs_update_inode(trans, new_root, inode); | |
2081 | BUG_ON(ret); | |
2082 | ||
2083 | ret = btrfs_commit_transaction(trans, new_root); | |
2084 | BUG_ON(ret); | |
2085 | ||
2086 | iput(inode); | |
2087 | ||
2088 | mutex_unlock(&root->fs_info->fs_mutex); | |
2089 | return 0; | |
2090 | } | |
2091 | ||
c5739bba CM |
2092 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
2093 | { | |
2094 | struct btrfs_trans_handle *trans; | |
2095 | struct btrfs_key key; | |
2096 | struct btrfs_root_item new_root_item; | |
2097 | int ret; | |
2098 | u64 objectid; | |
2099 | ||
2619ba1f CM |
2100 | if (!root->ref_cows) |
2101 | return -EINVAL; | |
2102 | ||
c5739bba CM |
2103 | mutex_lock(&root->fs_info->fs_mutex); |
2104 | trans = btrfs_start_transaction(root, 1); | |
2105 | BUG_ON(!trans); | |
2106 | ||
2107 | ret = btrfs_update_inode(trans, root, root->inode); | |
2108 | BUG_ON(ret); | |
2109 | ||
1b05da2e CM |
2110 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2111 | 0, &objectid); | |
c5739bba CM |
2112 | BUG_ON(ret); |
2113 | ||
c5739bba CM |
2114 | memcpy(&new_root_item, &root->root_item, |
2115 | sizeof(new_root_item)); | |
2116 | ||
c5739bba CM |
2117 | key.objectid = objectid; |
2118 | key.offset = 1; | |
2119 | key.flags = 0; | |
2120 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
7eccb903 | 2121 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
c5739bba CM |
2122 | |
2123 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2124 | &new_root_item); | |
2125 | BUG_ON(ret); | |
2126 | ||
c5739bba CM |
2127 | /* |
2128 | * insert the directory item | |
2129 | */ | |
2130 | key.offset = (u64)-1; | |
2131 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2132 | name, namelen, | |
2133 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2134 | &key, 0); | |
2135 | ||
2136 | BUG_ON(ret); | |
2137 | ||
2138 | ret = btrfs_inc_root_ref(trans, root); | |
2139 | BUG_ON(ret); | |
2140 | ||
2141 | ret = btrfs_commit_transaction(trans, root); | |
2142 | BUG_ON(ret); | |
2143 | mutex_unlock(&root->fs_info->fs_mutex); | |
2144 | return 0; | |
2145 | } | |
2146 | ||
8352d8a4 CM |
2147 | static int add_disk(struct btrfs_root *root, char *name, int namelen) |
2148 | { | |
2149 | struct block_device *bdev; | |
2150 | struct btrfs_path *path; | |
2151 | struct super_block *sb = root->fs_info->sb; | |
2152 | struct btrfs_root *dev_root = root->fs_info->dev_root; | |
2153 | struct btrfs_trans_handle *trans; | |
2154 | struct btrfs_device_item *dev_item; | |
2155 | struct btrfs_key key; | |
2156 | u16 item_size; | |
2157 | u64 num_blocks; | |
2158 | u64 new_blocks; | |
b4100d64 | 2159 | u64 device_id; |
8352d8a4 | 2160 | int ret; |
b4100d64 | 2161 | |
8352d8a4 CM |
2162 | printk("adding disk %s\n", name); |
2163 | path = btrfs_alloc_path(); | |
2164 | if (!path) | |
2165 | return -ENOMEM; | |
2166 | num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super); | |
2167 | bdev = open_bdev_excl(name, O_RDWR, sb); | |
2168 | if (IS_ERR(bdev)) { | |
2169 | ret = PTR_ERR(bdev); | |
2170 | printk("open bdev excl failed ret %d\n", ret); | |
2171 | goto out_nolock; | |
2172 | } | |
2173 | set_blocksize(bdev, sb->s_blocksize); | |
2174 | new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
2175 | key.objectid = num_blocks; | |
2176 | key.offset = new_blocks; | |
2177 | key.flags = 0; | |
2178 | btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY); | |
2179 | ||
2180 | mutex_lock(&dev_root->fs_info->fs_mutex); | |
2181 | trans = btrfs_start_transaction(dev_root, 1); | |
2182 | item_size = sizeof(*dev_item) + namelen; | |
2183 | printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size); | |
2184 | ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size); | |
2185 | if (ret) { | |
2186 | printk("insert failed %d\n", ret); | |
2187 | close_bdev_excl(bdev); | |
2188 | if (ret > 0) | |
2189 | ret = -EEXIST; | |
2190 | goto out; | |
2191 | } | |
2192 | dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2193 | path->slots[0], struct btrfs_device_item); | |
2194 | btrfs_set_device_pathlen(dev_item, namelen); | |
2195 | memcpy(dev_item + 1, name, namelen); | |
b4100d64 CM |
2196 | |
2197 | device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1; | |
2198 | btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id); | |
2199 | btrfs_set_device_id(dev_item, device_id); | |
8352d8a4 CM |
2200 | mark_buffer_dirty(path->nodes[0]); |
2201 | ||
b4100d64 CM |
2202 | ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks, |
2203 | new_blocks); | |
8352d8a4 CM |
2204 | |
2205 | if (!ret) { | |
2206 | btrfs_set_super_total_blocks(root->fs_info->disk_super, | |
2207 | num_blocks + new_blocks); | |
2208 | i_size_write(root->fs_info->btree_inode, | |
2209 | (num_blocks + new_blocks) << | |
2210 | root->fs_info->btree_inode->i_blkbits); | |
2211 | } | |
2212 | ||
2213 | out: | |
2214 | ret = btrfs_commit_transaction(trans, dev_root); | |
2215 | BUG_ON(ret); | |
2216 | mutex_unlock(&root->fs_info->fs_mutex); | |
2217 | out_nolock: | |
2218 | btrfs_free_path(path); | |
2219 | ||
2220 | return ret; | |
2221 | } | |
2222 | ||
c5739bba CM |
2223 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
2224 | cmd, unsigned long arg) | |
2225 | { | |
2226 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2227 | struct btrfs_ioctl_vol_args vol_args; | |
8352d8a4 | 2228 | int ret = 0; |
7e38180e | 2229 | struct btrfs_dir_item *di; |
c5739bba | 2230 | int namelen; |
2619ba1f CM |
2231 | struct btrfs_path *path; |
2232 | u64 root_dirid; | |
c5739bba | 2233 | |
c5739bba CM |
2234 | switch (cmd) { |
2235 | case BTRFS_IOC_SNAP_CREATE: | |
2236 | if (copy_from_user(&vol_args, | |
2237 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2238 | sizeof(vol_args))) | |
2239 | return -EFAULT; | |
2240 | namelen = strlen(vol_args.name); | |
2241 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2242 | return -EINVAL; | |
2619ba1f CM |
2243 | path = btrfs_alloc_path(); |
2244 | if (!path) | |
2245 | return -ENOMEM; | |
2d13d8d0 | 2246 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
2619ba1f | 2247 | mutex_lock(&root->fs_info->fs_mutex); |
7e38180e | 2248 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
2619ba1f CM |
2249 | path, root_dirid, |
2250 | vol_args.name, namelen, 0); | |
2251 | mutex_unlock(&root->fs_info->fs_mutex); | |
2d13d8d0 | 2252 | btrfs_free_path(path); |
7e38180e | 2253 | if (di && !IS_ERR(di)) |
2619ba1f CM |
2254 | return -EEXIST; |
2255 | ||
2256 | if (root == root->fs_info->tree_root) | |
2257 | ret = create_subvol(root, vol_args.name, namelen); | |
2258 | else | |
2259 | ret = create_snapshot(root, vol_args.name, namelen); | |
c5739bba CM |
2260 | WARN_ON(ret); |
2261 | break; | |
8352d8a4 CM |
2262 | case BTRFS_IOC_ADD_DISK: |
2263 | if (copy_from_user(&vol_args, | |
2264 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2265 | sizeof(vol_args))) | |
2266 | return -EFAULT; | |
2267 | namelen = strlen(vol_args.name); | |
2268 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2269 | return -EINVAL; | |
2270 | vol_args.name[namelen] = '\0'; | |
2271 | ret = add_disk(root, vol_args.name, namelen); | |
2272 | break; | |
c5739bba CM |
2273 | default: |
2274 | return -ENOTTY; | |
2275 | } | |
8352d8a4 | 2276 | return ret; |
c5739bba CM |
2277 | } |
2278 | ||
2c90e5d6 CM |
2279 | static struct kmem_cache *btrfs_inode_cachep; |
2280 | struct kmem_cache *btrfs_trans_handle_cachep; | |
2281 | struct kmem_cache *btrfs_transaction_cachep; | |
2282 | struct kmem_cache *btrfs_bit_radix_cachep; | |
2283 | struct kmem_cache *btrfs_path_cachep; | |
2284 | ||
2285 | /* | |
2286 | * Called inside transaction, so use GFP_NOFS | |
2287 | */ | |
2288 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2289 | { | |
2290 | struct btrfs_inode *ei; | |
2291 | ||
2292 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2293 | if (!ei) | |
2294 | return NULL; | |
2c90e5d6 CM |
2295 | return &ei->vfs_inode; |
2296 | } | |
2297 | ||
2298 | static void btrfs_destroy_inode(struct inode *inode) | |
2299 | { | |
2c90e5d6 | 2300 | WARN_ON(!list_empty(&inode->i_dentry)); |
2c90e5d6 CM |
2301 | WARN_ON(inode->i_data.nrpages); |
2302 | ||
2c90e5d6 CM |
2303 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2304 | } | |
2305 | ||
2306 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2307 | unsigned long flags) | |
2308 | { | |
2309 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2310 | ||
2311 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
2312 | SLAB_CTOR_CONSTRUCTOR) { | |
2313 | inode_init_once(&ei->vfs_inode); | |
2314 | } | |
2315 | } | |
2316 | ||
2317 | static int init_inodecache(void) | |
2318 | { | |
2319 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
2320 | sizeof(struct btrfs_inode), | |
2321 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2322 | SLAB_MEM_SPREAD), | |
2323 | init_once, NULL); | |
2324 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
2325 | sizeof(struct btrfs_trans_handle), | |
2326 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2327 | SLAB_MEM_SPREAD), | |
2328 | NULL, NULL); | |
2329 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
2330 | sizeof(struct btrfs_transaction), | |
2331 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2332 | SLAB_MEM_SPREAD), | |
2333 | NULL, NULL); | |
2334 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
2335 | sizeof(struct btrfs_transaction), | |
2336 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2337 | SLAB_MEM_SPREAD), | |
2338 | NULL, NULL); | |
2339 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
2340 | 256, | |
2341 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2342 | SLAB_MEM_SPREAD | | |
2343 | SLAB_DESTROY_BY_RCU), | |
2344 | NULL, NULL); | |
2345 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
2346 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
2347 | return -ENOMEM; | |
2348 | return 0; | |
2349 | } | |
2350 | ||
2351 | static void destroy_inodecache(void) | |
2352 | { | |
2353 | kmem_cache_destroy(btrfs_inode_cachep); | |
2354 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2355 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2356 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2357 | kmem_cache_destroy(btrfs_path_cachep); | |
2358 | } | |
2359 | ||
2e635a27 CM |
2360 | static int btrfs_get_sb(struct file_system_type *fs_type, |
2361 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
2362 | { | |
2363 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
2364 | btrfs_fill_super, mnt); | |
2365 | } | |
2366 | ||
236454df CM |
2367 | |
2368 | static int btrfs_getattr(struct vfsmount *mnt, | |
2369 | struct dentry *dentry, struct kstat *stat) | |
2370 | { | |
2371 | struct inode *inode = dentry->d_inode; | |
2372 | generic_fillattr(inode, stat); | |
2373 | stat->blksize = 256 * 1024; | |
2374 | return 0; | |
2375 | } | |
2376 | ||
8fd17795 CM |
2377 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2378 | { | |
2379 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
2380 | struct btrfs_super_block *disk_super = root->fs_info->disk_super; | |
2381 | ||
2382 | buf->f_namelen = BTRFS_NAME_LEN; | |
2383 | buf->f_blocks = btrfs_super_total_blocks(disk_super); | |
2384 | buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super); | |
2385 | buf->f_bavail = buf->f_bfree; | |
2386 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2387 | buf->f_type = BTRFS_SUPER_MAGIC; | |
2388 | return 0; | |
2389 | } | |
2e635a27 CM |
2390 | static struct file_system_type btrfs_fs_type = { |
2391 | .owner = THIS_MODULE, | |
2392 | .name = "btrfs", | |
2393 | .get_sb = btrfs_get_sb, | |
2394 | .kill_sb = kill_block_super, | |
2395 | .fs_flags = FS_REQUIRES_DEV, | |
2396 | }; | |
2397 | ||
e20d96d6 | 2398 | static struct super_operations btrfs_super_ops = { |
134e9731 | 2399 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
2400 | .put_super = btrfs_put_super, |
2401 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
2402 | .write_super = btrfs_write_super, |
2403 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 2404 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
2405 | .alloc_inode = btrfs_alloc_inode, |
2406 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2407 | .statfs = btrfs_statfs, |
e20d96d6 CM |
2408 | }; |
2409 | ||
2410 | static struct inode_operations btrfs_dir_inode_operations = { | |
2411 | .lookup = btrfs_lookup, | |
d5719762 | 2412 | .create = btrfs_create, |
134e9731 | 2413 | .unlink = btrfs_unlink, |
f7922033 | 2414 | .mkdir = btrfs_mkdir, |
5f443fd2 | 2415 | .rmdir = btrfs_rmdir, |
e20d96d6 CM |
2416 | }; |
2417 | ||
d6e4a428 CM |
2418 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2419 | .lookup = btrfs_lookup, | |
2420 | }; | |
2421 | ||
e20d96d6 CM |
2422 | static struct file_operations btrfs_dir_file_operations = { |
2423 | .llseek = generic_file_llseek, | |
2424 | .read = generic_read_dir, | |
2425 | .readdir = btrfs_readdir, | |
c5739bba | 2426 | .ioctl = btrfs_ioctl, |
e20d96d6 CM |
2427 | }; |
2428 | ||
dee26a9f CM |
2429 | static struct address_space_operations btrfs_aops = { |
2430 | .readpage = btrfs_readpage, | |
dee26a9f CM |
2431 | .writepage = btrfs_writepage, |
2432 | .sync_page = block_sync_page, | |
2433 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 2434 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
2435 | }; |
2436 | ||
2437 | static struct inode_operations btrfs_file_inode_operations = { | |
f4b9aa8d | 2438 | .truncate = btrfs_truncate, |
236454df | 2439 | .getattr = btrfs_getattr, |
dee26a9f CM |
2440 | }; |
2441 | ||
2442 | static struct file_operations btrfs_file_operations = { | |
2443 | .llseek = generic_file_llseek, | |
2444 | .read = do_sync_read, | |
e8f05c45 CM |
2445 | .aio_read = btrfs_file_aio_read, |
2446 | .write = btrfs_file_write, | |
dee26a9f CM |
2447 | .mmap = generic_file_mmap, |
2448 | .open = generic_file_open, | |
c5739bba | 2449 | .ioctl = btrfs_ioctl, |
8fd17795 | 2450 | .fsync = btrfs_sync_file, |
dee26a9f | 2451 | }; |
e20d96d6 | 2452 | |
2e635a27 CM |
2453 | static int __init init_btrfs_fs(void) |
2454 | { | |
2c90e5d6 | 2455 | int err; |
2e635a27 | 2456 | printk("btrfs loaded!\n"); |
2c90e5d6 CM |
2457 | err = init_inodecache(); |
2458 | if (err) | |
2459 | return err; | |
d6e4a428 CM |
2460 | kset_set_kset_s(&btrfs_subsys, fs_subsys); |
2461 | err = subsystem_register(&btrfs_subsys); | |
2462 | if (err) | |
2463 | goto out; | |
2e635a27 | 2464 | return register_filesystem(&btrfs_fs_type); |
d6e4a428 CM |
2465 | out: |
2466 | destroy_inodecache(); | |
2467 | return err; | |
2e635a27 CM |
2468 | } |
2469 | ||
2470 | static void __exit exit_btrfs_fs(void) | |
2471 | { | |
2c90e5d6 | 2472 | destroy_inodecache(); |
2e635a27 | 2473 | unregister_filesystem(&btrfs_fs_type); |
d6e4a428 | 2474 | subsystem_unregister(&btrfs_subsys); |
2e635a27 CM |
2475 | printk("btrfs unloaded\n"); |
2476 | } | |
2477 | ||
2478 | module_init(init_btrfs_fs) | |
2479 | module_exit(exit_btrfs_fs) | |
2480 | ||
2481 | MODULE_LICENSE("GPL"); |