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 | ||
f68cad0f CM |
123 | static void fill_inode_item(struct btrfs_inode_item *item, |
124 | struct inode *inode) | |
125 | { | |
126 | btrfs_set_inode_uid(item, inode->i_uid); | |
127 | btrfs_set_inode_gid(item, inode->i_gid); | |
128 | btrfs_set_inode_size(item, inode->i_size); | |
129 | btrfs_set_inode_mode(item, inode->i_mode); | |
130 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
131 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
132 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
133 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
134 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
135 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
136 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
137 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
138 | btrfs_set_inode_generation(item, inode->i_generation); | |
139 | } | |
140 | ||
141 | ||
142 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, | |
143 | struct btrfs_root *root, | |
144 | struct inode *inode) | |
145 | { | |
146 | struct btrfs_inode_item *inode_item; | |
147 | struct btrfs_path *path; | |
148 | int ret; | |
149 | ||
150 | path = btrfs_alloc_path(); | |
151 | BUG_ON(!path); | |
152 | btrfs_init_path(path); | |
153 | ret = btrfs_lookup_inode(trans, root, path, | |
154 | &BTRFS_I(inode)->location, 1); | |
155 | if (ret) { | |
156 | if (ret > 0) | |
157 | ret = -ENOENT; | |
158 | goto failed; | |
159 | } | |
160 | ||
161 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
162 | path->slots[0], | |
163 | struct btrfs_inode_item); | |
164 | ||
165 | fill_inode_item(inode_item, inode); | |
166 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
167 | ret = 0; | |
168 | failed: | |
169 | btrfs_release_path(root, path); | |
170 | btrfs_free_path(path); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | ||
5f443fd2 CM |
175 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
176 | struct btrfs_root *root, | |
177 | struct inode *dir, | |
178 | struct dentry *dentry) | |
134e9731 | 179 | { |
5caf2a00 | 180 | struct btrfs_path *path; |
134e9731 CM |
181 | const char *name = dentry->d_name.name; |
182 | int name_len = dentry->d_name.len; | |
7e38180e | 183 | int ret = 0; |
134e9731 CM |
184 | u64 objectid; |
185 | struct btrfs_dir_item *di; | |
186 | ||
5caf2a00 CM |
187 | path = btrfs_alloc_path(); |
188 | BUG_ON(!path); | |
189 | btrfs_init_path(path); | |
7e38180e | 190 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
134e9731 | 191 | name, name_len, -1); |
7e38180e CM |
192 | if (IS_ERR(di)) { |
193 | ret = PTR_ERR(di); | |
134e9731 | 194 | goto err; |
7e38180e CM |
195 | } |
196 | if (!di) { | |
134e9731 CM |
197 | ret = -ENOENT; |
198 | goto err; | |
199 | } | |
d6e4a428 | 200 | objectid = btrfs_disk_key_objectid(&di->location); |
7e38180e CM |
201 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
202 | BUG_ON(ret); | |
203 | btrfs_release_path(root, path); | |
134e9731 | 204 | |
7e38180e CM |
205 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
206 | objectid, name, name_len, -1); | |
207 | if (IS_ERR(di)) { | |
208 | ret = PTR_ERR(di); | |
209 | goto err; | |
210 | } | |
211 | if (!di) { | |
212 | ret = -ENOENT; | |
213 | goto err; | |
214 | } | |
215 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
5f26f772 CM |
216 | BUG_ON(ret); |
217 | ||
134e9731 CM |
218 | dentry->d_inode->i_ctime = dir->i_ctime; |
219 | err: | |
5caf2a00 | 220 | btrfs_free_path(path); |
f68cad0f | 221 | if (!ret) { |
5f26f772 | 222 | dir->i_size -= name_len * 2; |
f68cad0f CM |
223 | btrfs_update_inode(trans, root, dir); |
224 | drop_nlink(dentry->d_inode); | |
225 | btrfs_update_inode(trans, root, dentry->d_inode); | |
d4dbff95 | 226 | } |
134e9731 CM |
227 | return ret; |
228 | } | |
229 | ||
5f443fd2 CM |
230 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
231 | { | |
232 | struct btrfs_root *root; | |
233 | struct btrfs_trans_handle *trans; | |
234 | int ret; | |
235 | ||
d6e4a428 | 236 | root = BTRFS_I(dir)->root; |
5f443fd2 CM |
237 | mutex_lock(&root->fs_info->fs_mutex); |
238 | trans = btrfs_start_transaction(root, 1); | |
239 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
240 | btrfs_end_transaction(trans, root); | |
241 | mutex_unlock(&root->fs_info->fs_mutex); | |
242 | return ret; | |
243 | } | |
244 | ||
245 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
246 | { | |
247 | struct inode *inode = dentry->d_inode; | |
248 | int err; | |
249 | int ret; | |
d6e4a428 | 250 | struct btrfs_root *root = BTRFS_I(dir)->root; |
5caf2a00 | 251 | struct btrfs_path *path; |
5f443fd2 CM |
252 | struct btrfs_key key; |
253 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
254 | struct btrfs_key found_key; |
255 | int found_type; | |
5f443fd2 | 256 | struct btrfs_leaf *leaf; |
5f26f772 | 257 | char *goodnames = ".."; |
5f443fd2 | 258 | |
5caf2a00 CM |
259 | path = btrfs_alloc_path(); |
260 | BUG_ON(!path); | |
261 | btrfs_init_path(path); | |
5f443fd2 CM |
262 | mutex_lock(&root->fs_info->fs_mutex); |
263 | trans = btrfs_start_transaction(root, 1); | |
264 | key.objectid = inode->i_ino; | |
265 | key.offset = (u64)-1; | |
5f26f772 CM |
266 | key.flags = (u32)-1; |
267 | while(1) { | |
268 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
269 | if (ret < 0) { | |
270 | err = ret; | |
271 | goto out; | |
272 | } | |
273 | BUG_ON(ret == 0); | |
274 | if (path->slots[0] == 0) { | |
275 | err = -ENOENT; | |
276 | goto out; | |
277 | } | |
278 | path->slots[0]--; | |
279 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
280 | btrfs_disk_key_to_cpu(&found_key, | |
281 | &leaf->items[path->slots[0]].key); | |
282 | found_type = btrfs_key_type(&found_key); | |
283 | if (found_key.objectid != inode->i_ino) { | |
284 | err = -ENOENT; | |
285 | goto out; | |
286 | } | |
287 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
288 | found_type != BTRFS_DIR_INDEX_KEY) || | |
289 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
290 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
291 | err = -ENOTEMPTY; | |
292 | goto out; | |
293 | } | |
294 | ret = btrfs_del_item(trans, root, path); | |
295 | BUG_ON(ret); | |
5f443fd2 | 296 | |
5f26f772 CM |
297 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
298 | break; | |
299 | btrfs_release_path(root, path); | |
5f443fd2 | 300 | } |
5f26f772 | 301 | ret = 0; |
5caf2a00 | 302 | btrfs_release_path(root, path); |
5f443fd2 CM |
303 | |
304 | /* now the directory is empty */ | |
305 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
306 | if (!err) { | |
307 | inode->i_size = 0; | |
308 | } | |
309 | out: | |
7cfcc17e CM |
310 | btrfs_release_path(root, path); |
311 | btrfs_free_path(path); | |
5f443fd2 CM |
312 | mutex_unlock(&root->fs_info->fs_mutex); |
313 | ret = btrfs_end_transaction(trans, root); | |
314 | if (ret && !err) | |
315 | err = ret; | |
316 | return err; | |
317 | } | |
318 | ||
134e9731 CM |
319 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
320 | struct btrfs_root *root, | |
321 | struct inode *inode) | |
322 | { | |
5caf2a00 | 323 | struct btrfs_path *path; |
134e9731 | 324 | int ret; |
5caf2a00 | 325 | |
134e9731 | 326 | clear_inode(inode); |
5caf2a00 CM |
327 | |
328 | path = btrfs_alloc_path(); | |
329 | BUG_ON(!path); | |
330 | btrfs_init_path(path); | |
d6e4a428 CM |
331 | ret = btrfs_lookup_inode(trans, root, path, |
332 | &BTRFS_I(inode)->location, -1); | |
134e9731 | 333 | BUG_ON(ret); |
5caf2a00 | 334 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 335 | BUG_ON(ret); |
5caf2a00 | 336 | btrfs_free_path(path); |
134e9731 CM |
337 | return ret; |
338 | } | |
339 | ||
f4b9aa8d CM |
340 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
341 | struct btrfs_root *root, | |
342 | struct inode *inode) | |
343 | { | |
344 | int ret; | |
5caf2a00 | 345 | struct btrfs_path *path; |
f4b9aa8d CM |
346 | struct btrfs_key key; |
347 | struct btrfs_disk_key *found_key; | |
348 | struct btrfs_leaf *leaf; | |
f254e52c CM |
349 | struct btrfs_file_extent_item *fi = NULL; |
350 | u64 extent_start = 0; | |
351 | u64 extent_num_blocks = 0; | |
352 | int found_extent; | |
f4b9aa8d | 353 | |
5caf2a00 CM |
354 | path = btrfs_alloc_path(); |
355 | BUG_ON(!path); | |
f4b9aa8d CM |
356 | /* FIXME, add redo link to tree so we don't leak on crash */ |
357 | key.objectid = inode->i_ino; | |
358 | key.offset = (u64)-1; | |
359 | key.flags = 0; | |
d4dbff95 CM |
360 | /* |
361 | * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys | |
362 | * or extent data | |
363 | */ | |
f254e52c | 364 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
f4b9aa8d | 365 | while(1) { |
5caf2a00 CM |
366 | btrfs_init_path(path); |
367 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
f4b9aa8d | 368 | if (ret < 0) { |
f4b9aa8d CM |
369 | goto error; |
370 | } | |
371 | if (ret > 0) { | |
5caf2a00 CM |
372 | BUG_ON(path->slots[0] == 0); |
373 | path->slots[0]--; | |
f4b9aa8d | 374 | } |
5caf2a00 CM |
375 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
376 | found_key = &leaf->items[path->slots[0]].key; | |
f4b9aa8d CM |
377 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
378 | break; | |
f254e52c CM |
379 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
380 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) | |
f4b9aa8d | 381 | break; |
f4b9aa8d CM |
382 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
383 | break; | |
236454df | 384 | found_extent = 0; |
f254e52c | 385 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
5caf2a00 CM |
386 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
387 | path->slots[0], | |
f254e52c | 388 | struct btrfs_file_extent_item); |
236454df CM |
389 | if (btrfs_file_extent_type(fi) != |
390 | BTRFS_FILE_EXTENT_INLINE) { | |
391 | extent_start = | |
392 | btrfs_file_extent_disk_blocknr(fi); | |
393 | extent_num_blocks = | |
394 | btrfs_file_extent_disk_num_blocks(fi); | |
395 | /* FIXME blocksize != 4096 */ | |
396 | inode->i_blocks -= | |
397 | btrfs_file_extent_num_blocks(fi) << 3; | |
398 | found_extent = 1; | |
399 | } | |
f254e52c | 400 | } |
5caf2a00 | 401 | ret = btrfs_del_item(trans, root, path); |
f4b9aa8d | 402 | BUG_ON(ret); |
5caf2a00 | 403 | btrfs_release_path(root, path); |
f254e52c CM |
404 | if (found_extent) { |
405 | ret = btrfs_free_extent(trans, root, extent_start, | |
406 | extent_num_blocks, 0); | |
407 | BUG_ON(ret); | |
408 | } | |
f4b9aa8d | 409 | } |
f4b9aa8d CM |
410 | ret = 0; |
411 | error: | |
5caf2a00 CM |
412 | btrfs_release_path(root, path); |
413 | btrfs_free_path(path); | |
f4b9aa8d CM |
414 | return ret; |
415 | } | |
416 | ||
134e9731 CM |
417 | static void btrfs_delete_inode(struct inode *inode) |
418 | { | |
419 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 420 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
421 | int ret; |
422 | ||
134e9731 CM |
423 | truncate_inode_pages(&inode->i_data, 0); |
424 | if (is_bad_inode(inode)) { | |
425 | goto no_delete; | |
426 | } | |
427 | inode->i_size = 0; | |
134e9731 CM |
428 | mutex_lock(&root->fs_info->fs_mutex); |
429 | trans = btrfs_start_transaction(root, 1); | |
f4b9aa8d CM |
430 | if (S_ISREG(inode->i_mode)) { |
431 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
432 | BUG_ON(ret); | |
433 | } | |
134e9731 CM |
434 | btrfs_free_inode(trans, root, inode); |
435 | btrfs_end_transaction(trans, root); | |
436 | mutex_unlock(&root->fs_info->fs_mutex); | |
437 | return; | |
438 | no_delete: | |
439 | clear_inode(inode); | |
440 | } | |
441 | ||
e20d96d6 | 442 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
d6e4a428 | 443 | struct btrfs_key *location) |
e20d96d6 CM |
444 | { |
445 | const char *name = dentry->d_name.name; | |
446 | int namelen = dentry->d_name.len; | |
447 | struct btrfs_dir_item *di; | |
5caf2a00 | 448 | struct btrfs_path *path; |
d6e4a428 | 449 | struct btrfs_root *root = BTRFS_I(dir)->root; |
e20d96d6 CM |
450 | int ret; |
451 | ||
5caf2a00 CM |
452 | path = btrfs_alloc_path(); |
453 | BUG_ON(!path); | |
454 | btrfs_init_path(path); | |
7e38180e | 455 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
e20d96d6 | 456 | namelen, 0); |
7e38180e | 457 | if (!di || IS_ERR(di)) { |
d6e4a428 | 458 | location->objectid = 0; |
2c90e5d6 | 459 | ret = 0; |
e20d96d6 CM |
460 | goto out; |
461 | } | |
d6e4a428 | 462 | btrfs_disk_key_to_cpu(location, &di->location); |
e20d96d6 | 463 | out: |
5caf2a00 CM |
464 | btrfs_release_path(root, path); |
465 | btrfs_free_path(path); | |
e20d96d6 CM |
466 | return ret; |
467 | } | |
468 | ||
d6e4a428 CM |
469 | int fixup_tree_root_location(struct btrfs_root *root, |
470 | struct btrfs_key *location, | |
471 | struct btrfs_root **sub_root) | |
472 | { | |
473 | struct btrfs_path *path; | |
474 | struct btrfs_root_item *ri; | |
d6e4a428 CM |
475 | |
476 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
477 | return 0; | |
478 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
479 | return 0; | |
480 | ||
481 | path = btrfs_alloc_path(); | |
482 | BUG_ON(!path); | |
483 | mutex_lock(&root->fs_info->fs_mutex); | |
484 | ||
0f7d52f4 CM |
485 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
486 | if (IS_ERR(*sub_root)) | |
487 | return PTR_ERR(*sub_root); | |
488 | ||
489 | ri = &(*sub_root)->root_item; | |
d6e4a428 CM |
490 | location->objectid = btrfs_root_dirid(ri); |
491 | location->flags = 0; | |
492 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
493 | location->offset = 0; | |
0f7d52f4 | 494 | |
d6e4a428 CM |
495 | btrfs_free_path(path); |
496 | mutex_unlock(&root->fs_info->fs_mutex); | |
0f7d52f4 | 497 | return 0; |
d6e4a428 CM |
498 | } |
499 | ||
c5739bba CM |
500 | int btrfs_init_locked_inode(struct inode *inode, void *p) |
501 | { | |
502 | struct btrfs_iget_args *args = p; | |
503 | inode->i_ino = args->ino; | |
504 | BTRFS_I(inode)->root = args->root; | |
505 | return 0; | |
506 | } | |
507 | ||
508 | int btrfs_find_actor(struct inode *inode, void *opaque) | |
509 | { | |
510 | struct btrfs_iget_args *args = opaque; | |
511 | return (args->ino == inode->i_ino && | |
512 | args->root == BTRFS_I(inode)->root); | |
513 | } | |
514 | ||
515 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
516 | struct btrfs_root *root) | |
517 | { | |
518 | struct inode *inode; | |
519 | struct btrfs_iget_args args; | |
520 | args.ino = objectid; | |
521 | args.root = root; | |
522 | ||
523 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
524 | btrfs_init_locked_inode, | |
525 | (void *)&args); | |
526 | return inode; | |
527 | } | |
d6e4a428 | 528 | |
e20d96d6 CM |
529 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
530 | struct nameidata *nd) | |
531 | { | |
532 | struct inode * inode; | |
d6e4a428 CM |
533 | struct btrfs_inode *bi = BTRFS_I(dir); |
534 | struct btrfs_root *root = bi->root; | |
535 | struct btrfs_root *sub_root = root; | |
536 | struct btrfs_key location; | |
e20d96d6 CM |
537 | int ret; |
538 | ||
539 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
540 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 541 | mutex_lock(&root->fs_info->fs_mutex); |
d6e4a428 | 542 | ret = btrfs_inode_by_name(dir, dentry, &location); |
22b0ebda | 543 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
544 | if (ret < 0) |
545 | return ERR_PTR(ret); | |
546 | inode = NULL; | |
d6e4a428 CM |
547 | if (location.objectid) { |
548 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
549 | if (ret < 0) | |
550 | return ERR_PTR(ret); | |
551 | if (ret > 0) | |
552 | return ERR_PTR(-ENOENT); | |
c5739bba CM |
553 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
554 | sub_root); | |
e20d96d6 CM |
555 | if (!inode) |
556 | return ERR_PTR(-EACCES); | |
d6e4a428 | 557 | if (inode->i_state & I_NEW) { |
0f7d52f4 | 558 | if (sub_root != root) { |
c5739bba | 559 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
0f7d52f4 CM |
560 | igrab(inode); |
561 | sub_root->inode = inode; | |
562 | } | |
d6e4a428 CM |
563 | BTRFS_I(inode)->root = sub_root; |
564 | memcpy(&BTRFS_I(inode)->location, &location, | |
565 | sizeof(location)); | |
566 | btrfs_read_locked_inode(inode); | |
567 | unlock_new_inode(inode); | |
568 | } | |
e20d96d6 CM |
569 | } |
570 | return d_splice_alias(inode, dentry); | |
571 | } | |
572 | ||
573 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
574 | { | |
575 | struct inode *inode = filp->f_path.dentry->d_inode; | |
d6e4a428 | 576 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e20d96d6 CM |
577 | struct btrfs_item *item; |
578 | struct btrfs_dir_item *di; | |
579 | struct btrfs_key key; | |
5caf2a00 | 580 | struct btrfs_path *path; |
e20d96d6 CM |
581 | int ret; |
582 | u32 nritems; | |
583 | struct btrfs_leaf *leaf; | |
584 | int slot; | |
585 | int advance; | |
586 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 587 | int over = 0; |
7e38180e CM |
588 | u32 di_cur; |
589 | u32 di_total; | |
590 | u32 di_len; | |
591 | int key_type = BTRFS_DIR_INDEX_KEY; | |
d6e4a428 CM |
592 | |
593 | /* FIXME, use a real flag for deciding about the key type */ | |
594 | if (root->fs_info->tree_root == root) | |
595 | key_type = BTRFS_DIR_ITEM_KEY; | |
22b0ebda | 596 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 597 | key.objectid = inode->i_ino; |
e20d96d6 | 598 | key.flags = 0; |
d6e4a428 | 599 | btrfs_set_key_type(&key, key_type); |
e20d96d6 | 600 | key.offset = filp->f_pos; |
5caf2a00 CM |
601 | path = btrfs_alloc_path(); |
602 | btrfs_init_path(path); | |
603 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1b05da2e | 604 | if (ret < 0) |
e20d96d6 | 605 | goto err; |
7f5c1516 | 606 | advance = 0; |
e20d96d6 | 607 | while(1) { |
5caf2a00 | 608 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 609 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 610 | slot = path->slots[0]; |
dee26a9f CM |
611 | if (advance || slot >= nritems) { |
612 | if (slot >= nritems -1) { | |
5caf2a00 | 613 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
614 | if (ret) |
615 | break; | |
5caf2a00 | 616 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 617 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 618 | slot = path->slots[0]; |
e20d96d6 CM |
619 | } else { |
620 | slot++; | |
5caf2a00 | 621 | path->slots[0]++; |
e20d96d6 CM |
622 | } |
623 | } | |
624 | advance = 1; | |
625 | item = leaf->items + slot; | |
e20d96d6 CM |
626 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
627 | break; | |
d6e4a428 | 628 | if (btrfs_disk_key_type(&item->key) != key_type) |
a429e513 | 629 | break; |
7f5c1516 CM |
630 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
631 | continue; | |
7fcde0e3 | 632 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
dee26a9f | 633 | advance = 1; |
e20d96d6 | 634 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
7e38180e CM |
635 | di_cur = 0; |
636 | di_total = btrfs_item_size(leaf->items + slot); | |
637 | while(di_cur < di_total) { | |
638 | over = filldir(dirent, (const char *)(di + 1), | |
639 | btrfs_dir_name_len(di), | |
640 | btrfs_disk_key_offset(&item->key), | |
641 | btrfs_disk_key_objectid(&di->location), | |
642 | d_type); | |
643 | if (over) | |
644 | goto nopos; | |
645 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
646 | di_cur += di_len; | |
647 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
648 | } | |
e20d96d6 | 649 | } |
7fcde0e3 CM |
650 | filp->f_pos++; |
651 | nopos: | |
e20d96d6 CM |
652 | ret = 0; |
653 | err: | |
5caf2a00 CM |
654 | btrfs_release_path(root, path); |
655 | btrfs_free_path(path); | |
22b0ebda | 656 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
657 | return ret; |
658 | } | |
659 | ||
660 | static void btrfs_put_super (struct super_block * sb) | |
661 | { | |
662 | struct btrfs_root *root = btrfs_sb(sb); | |
663 | int ret; | |
664 | ||
665 | ret = close_ctree(root); | |
666 | if (ret) { | |
667 | printk("close ctree returns %d\n", ret); | |
668 | } | |
669 | sb->s_fs_info = NULL; | |
670 | } | |
2e635a27 CM |
671 | |
672 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
673 | { | |
674 | struct inode * inode; | |
e20d96d6 CM |
675 | struct dentry * root_dentry; |
676 | struct btrfs_super_block *disk_super; | |
0f7d52f4 | 677 | struct btrfs_root *tree_root; |
d6e4a428 | 678 | struct btrfs_inode *bi; |
2e635a27 CM |
679 | |
680 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 681 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 682 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 683 | sb->s_time_gran = 1; |
e20d96d6 | 684 | |
0f7d52f4 | 685 | tree_root = open_ctree(sb); |
d98237b3 | 686 | |
0f7d52f4 | 687 | if (!tree_root) { |
e20d96d6 CM |
688 | printk("btrfs: open_ctree failed\n"); |
689 | return -EIO; | |
690 | } | |
0f7d52f4 CM |
691 | sb->s_fs_info = tree_root; |
692 | disk_super = tree_root->fs_info->disk_super; | |
e20d96d6 CM |
693 | printk("read in super total blocks %Lu root %Lu\n", |
694 | btrfs_super_total_blocks(disk_super), | |
695 | btrfs_super_root_dir(disk_super)); | |
696 | ||
c5739bba CM |
697 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
698 | tree_root); | |
d6e4a428 CM |
699 | bi = BTRFS_I(inode); |
700 | bi->location.objectid = inode->i_ino; | |
701 | bi->location.offset = 0; | |
702 | bi->location.flags = 0; | |
0f7d52f4 | 703 | bi->root = tree_root; |
d6e4a428 CM |
704 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
705 | ||
2e635a27 CM |
706 | if (!inode) |
707 | return -ENOMEM; | |
e20d96d6 CM |
708 | if (inode->i_state & I_NEW) { |
709 | btrfs_read_locked_inode(inode); | |
710 | unlock_new_inode(inode); | |
711 | } | |
2e635a27 | 712 | |
e20d96d6 CM |
713 | root_dentry = d_alloc_root(inode); |
714 | if (!root_dentry) { | |
2e635a27 CM |
715 | iput(inode); |
716 | return -ENOMEM; | |
717 | } | |
e20d96d6 CM |
718 | sb->s_root = root_dentry; |
719 | ||
2e635a27 CM |
720 | return 0; |
721 | } | |
722 | ||
4730a4bc CM |
723 | static int btrfs_write_inode(struct inode *inode, int wait) |
724 | { | |
d6e4a428 | 725 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4730a4bc | 726 | struct btrfs_trans_handle *trans; |
b5133862 CM |
727 | int ret = 0; |
728 | ||
729 | if (wait) { | |
730 | mutex_lock(&root->fs_info->fs_mutex); | |
731 | trans = btrfs_start_transaction(root, 1); | |
732 | ret = btrfs_commit_transaction(trans, root); | |
733 | mutex_unlock(&root->fs_info->fs_mutex); | |
734 | } | |
735 | return ret; | |
736 | } | |
737 | ||
738 | static void btrfs_dirty_inode(struct inode *inode) | |
739 | { | |
740 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
741 | struct btrfs_trans_handle *trans; | |
4730a4bc CM |
742 | |
743 | mutex_lock(&root->fs_info->fs_mutex); | |
744 | trans = btrfs_start_transaction(root, 1); | |
b5133862 CM |
745 | btrfs_update_inode(trans, root, inode); |
746 | btrfs_end_transaction(trans, root); | |
4730a4bc | 747 | mutex_unlock(&root->fs_info->fs_mutex); |
4730a4bc CM |
748 | } |
749 | ||
d5719762 | 750 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2619ba1f CM |
751 | struct btrfs_root *root, |
752 | u64 objectid, int mode) | |
d5719762 CM |
753 | { |
754 | struct inode *inode; | |
755 | struct btrfs_inode_item inode_item; | |
1b05da2e | 756 | struct btrfs_key *location; |
d5719762 | 757 | int ret; |
d5719762 | 758 | |
2619ba1f | 759 | inode = new_inode(root->fs_info->sb); |
d5719762 CM |
760 | if (!inode) |
761 | return ERR_PTR(-ENOMEM); | |
762 | ||
2619ba1f | 763 | BTRFS_I(inode)->root = root; |
d5719762 CM |
764 | |
765 | inode->i_uid = current->fsuid; | |
766 | inode->i_gid = current->fsgid; | |
767 | inode->i_mode = mode; | |
768 | inode->i_ino = objectid; | |
769 | inode->i_blocks = 0; | |
c5739bba | 770 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
d5719762 | 771 | fill_inode_item(&inode_item, inode); |
1b05da2e CM |
772 | location = &BTRFS_I(inode)->location; |
773 | location->objectid = objectid; | |
774 | location->flags = 0; | |
775 | location->offset = 0; | |
776 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
d5719762 CM |
777 | |
778 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
779 | BUG_ON(ret); | |
780 | ||
781 | insert_inode_hash(inode); | |
d5719762 CM |
782 | return inode; |
783 | } | |
784 | ||
785 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
786 | struct dentry *dentry, struct inode *inode) | |
787 | { | |
788 | int ret; | |
d6e4a428 CM |
789 | struct btrfs_key key; |
790 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
791 | key.objectid = inode->i_ino; | |
792 | key.flags = 0; | |
793 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
794 | key.offset = 0; | |
795 | ||
796 | ret = btrfs_insert_dir_item(trans, root, | |
d5719762 CM |
797 | dentry->d_name.name, dentry->d_name.len, |
798 | dentry->d_parent->d_inode->i_ino, | |
d6e4a428 | 799 | &key, 0); |
4730a4bc | 800 | if (ret == 0) { |
5f26f772 | 801 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
d6e4a428 | 802 | ret = btrfs_update_inode(trans, root, |
4730a4bc CM |
803 | dentry->d_parent->d_inode); |
804 | } | |
d5719762 CM |
805 | return ret; |
806 | } | |
807 | ||
808 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
809 | struct dentry *dentry, struct inode *inode) | |
810 | { | |
811 | int err = btrfs_add_link(trans, dentry, inode); | |
812 | if (!err) { | |
813 | d_instantiate(dentry, inode); | |
814 | return 0; | |
815 | } | |
2c90e5d6 CM |
816 | if (err > 0) |
817 | err = -EEXIST; | |
d5719762 CM |
818 | return err; |
819 | } | |
820 | ||
821 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
822 | int mode, struct nameidata *nd) | |
823 | { | |
824 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 825 | struct btrfs_root *root = BTRFS_I(dir)->root; |
d5719762 CM |
826 | struct inode *inode; |
827 | int err; | |
134e9731 | 828 | int drop_inode = 0; |
2619ba1f | 829 | u64 objectid; |
d5719762 | 830 | |
d561c025 | 831 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 | 832 | trans = btrfs_start_transaction(root, 1); |
2619ba1f CM |
833 | |
834 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
835 | if (err) { | |
836 | err = -ENOSPC; | |
837 | goto out_unlock; | |
838 | } | |
839 | ||
840 | inode = btrfs_new_inode(trans, root, objectid, mode); | |
d5719762 CM |
841 | err = PTR_ERR(inode); |
842 | if (IS_ERR(inode)) | |
d561c025 | 843 | goto out_unlock; |
d5719762 CM |
844 | // FIXME mark the inode dirty |
845 | err = btrfs_add_nondir(trans, dentry, inode); | |
134e9731 CM |
846 | if (err) |
847 | drop_inode = 1; | |
dee26a9f CM |
848 | else { |
849 | inode->i_mapping->a_ops = &btrfs_aops; | |
850 | inode->i_fop = &btrfs_file_operations; | |
851 | inode->i_op = &btrfs_file_inode_operations; | |
852 | } | |
d5719762 | 853 | dir->i_sb->s_dirt = 1; |
d561c025 | 854 | out_unlock: |
22b0ebda | 855 | btrfs_end_transaction(trans, root); |
d561c025 | 856 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 857 | |
134e9731 CM |
858 | if (drop_inode) { |
859 | inode_dec_link_count(inode); | |
860 | iput(inode); | |
861 | } | |
d5719762 CM |
862 | return err; |
863 | } | |
864 | ||
f7922033 | 865 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
2619ba1f CM |
866 | struct btrfs_root *root, |
867 | u64 objectid, u64 dirid) | |
f7922033 | 868 | { |
f7922033 CM |
869 | int ret; |
870 | char buf[2]; | |
d6e4a428 CM |
871 | struct btrfs_key key; |
872 | ||
f7922033 CM |
873 | buf[0] = '.'; |
874 | buf[1] = '.'; | |
875 | ||
2619ba1f | 876 | key.objectid = objectid; |
d6e4a428 CM |
877 | key.offset = 0; |
878 | key.flags = 0; | |
879 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
880 | ||
2619ba1f | 881 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
d6e4a428 | 882 | &key, 1); |
f7922033 CM |
883 | if (ret) |
884 | goto error; | |
2619ba1f CM |
885 | key.objectid = dirid; |
886 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
d6e4a428 | 887 | &key, 1); |
4730a4bc CM |
888 | if (ret) |
889 | goto error; | |
f7922033 CM |
890 | error: |
891 | return ret; | |
892 | } | |
893 | ||
894 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
895 | { | |
896 | struct inode *inode; | |
897 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 898 | struct btrfs_root *root = BTRFS_I(dir)->root; |
f7922033 CM |
899 | int err = 0; |
900 | int drop_on_err = 0; | |
2619ba1f | 901 | u64 objectid; |
f7922033 CM |
902 | |
903 | mutex_lock(&root->fs_info->fs_mutex); | |
904 | trans = btrfs_start_transaction(root, 1); | |
905 | if (IS_ERR(trans)) { | |
906 | err = PTR_ERR(trans); | |
907 | goto out_unlock; | |
908 | } | |
2619ba1f CM |
909 | |
910 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
911 | if (err) { | |
912 | err = -ENOSPC; | |
913 | goto out_unlock; | |
914 | } | |
915 | ||
916 | inode = btrfs_new_inode(trans, root, objectid, S_IFDIR | mode); | |
f7922033 CM |
917 | if (IS_ERR(inode)) { |
918 | err = PTR_ERR(inode); | |
919 | goto out_fail; | |
920 | } | |
921 | drop_on_err = 1; | |
922 | inode->i_op = &btrfs_dir_inode_operations; | |
923 | inode->i_fop = &btrfs_dir_file_operations; | |
924 | ||
2619ba1f CM |
925 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
926 | if (err) | |
927 | goto out_fail; | |
928 | ||
929 | inode->i_size = 6; | |
930 | err = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
931 | if (err) |
932 | goto out_fail; | |
933 | err = btrfs_add_link(trans, dentry, inode); | |
934 | if (err) | |
935 | goto out_fail; | |
936 | d_instantiate(dentry, inode); | |
f7922033 CM |
937 | drop_on_err = 0; |
938 | ||
939 | out_fail: | |
940 | btrfs_end_transaction(trans, root); | |
941 | out_unlock: | |
942 | mutex_unlock(&root->fs_info->fs_mutex); | |
943 | if (drop_on_err) | |
944 | iput(inode); | |
945 | return err; | |
946 | } | |
947 | ||
8fd17795 CM |
948 | static int btrfs_sync_file(struct file *file, |
949 | struct dentry *dentry, int datasync) | |
950 | { | |
951 | struct inode *inode = dentry->d_inode; | |
952 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
953 | int ret; | |
954 | struct btrfs_trans_handle *trans; | |
955 | ||
956 | mutex_lock(&root->fs_info->fs_mutex); | |
957 | trans = btrfs_start_transaction(root, 1); | |
958 | if (!trans) { | |
959 | ret = -ENOMEM; | |
960 | goto out; | |
961 | } | |
962 | ret = btrfs_commit_transaction(trans, root); | |
963 | mutex_unlock(&root->fs_info->fs_mutex); | |
964 | out: | |
965 | return ret > 0 ? EIO : ret; | |
966 | } | |
967 | ||
d5719762 CM |
968 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
969 | { | |
970 | struct btrfs_trans_handle *trans; | |
971 | struct btrfs_root *root; | |
972 | int ret; | |
d98237b3 | 973 | root = btrfs_sb(sb); |
df2ce34c | 974 | |
d5719762 | 975 | sb->s_dirt = 0; |
d561c025 | 976 | if (!wait) { |
7cfcc17e | 977 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
978 | return 0; |
979 | } | |
7cfcc17e | 980 | filemap_write_and_wait(root->fs_info->btree_inode->i_mapping); |
d561c025 | 981 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
982 | trans = btrfs_start_transaction(root, 1); |
983 | ret = btrfs_commit_transaction(trans, root); | |
984 | sb->s_dirt = 0; | |
985 | BUG_ON(ret); | |
986 | printk("btrfs sync_fs\n"); | |
d561c025 | 987 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
988 | return 0; |
989 | } | |
990 | ||
75dfe396 | 991 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
992 | struct buffer_head *result, int create) |
993 | { | |
994 | int ret; | |
995 | int err = 0; | |
996 | u64 blocknr; | |
997 | u64 extent_start = 0; | |
998 | u64 extent_end = 0; | |
999 | u64 objectid = inode->i_ino; | |
236454df | 1000 | u32 found_type; |
5caf2a00 | 1001 | struct btrfs_path *path; |
d6e4a428 | 1002 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dee26a9f CM |
1003 | struct btrfs_file_extent_item *item; |
1004 | struct btrfs_leaf *leaf; | |
1005 | struct btrfs_disk_key *found_key; | |
1006 | ||
5caf2a00 CM |
1007 | path = btrfs_alloc_path(); |
1008 | BUG_ON(!path); | |
1009 | btrfs_init_path(path); | |
6567e837 | 1010 | if (create) { |
6567e837 CM |
1011 | WARN_ON(1); |
1012 | } | |
dee26a9f | 1013 | |
236454df | 1014 | ret = btrfs_lookup_file_extent(NULL, root, path, |
9773a788 | 1015 | inode->i_ino, |
236454df | 1016 | iblock << inode->i_blkbits, 0); |
dee26a9f | 1017 | if (ret < 0) { |
dee26a9f CM |
1018 | err = ret; |
1019 | goto out; | |
1020 | } | |
1021 | ||
1022 | if (ret != 0) { | |
5caf2a00 CM |
1023 | if (path->slots[0] == 0) { |
1024 | btrfs_release_path(root, path); | |
236454df | 1025 | goto out; |
dee26a9f | 1026 | } |
5caf2a00 | 1027 | path->slots[0]--; |
dee26a9f CM |
1028 | } |
1029 | ||
5caf2a00 | 1030 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 1031 | struct btrfs_file_extent_item); |
5caf2a00 | 1032 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
1033 | blocknr = btrfs_file_extent_disk_blocknr(item); |
1034 | blocknr += btrfs_file_extent_offset(item); | |
1035 | ||
dee26a9f | 1036 | /* are we inside the extent that was found? */ |
5caf2a00 | 1037 | found_key = &leaf->items[path->slots[0]].key; |
236454df | 1038 | found_type = btrfs_disk_key_type(found_key); |
dee26a9f | 1039 | if (btrfs_disk_key_objectid(found_key) != objectid || |
236454df | 1040 | found_type != BTRFS_EXTENT_DATA_KEY) { |
dee26a9f CM |
1041 | extent_end = 0; |
1042 | extent_start = 0; | |
5caf2a00 | 1043 | btrfs_release_path(root, path); |
dee26a9f CM |
1044 | goto out; |
1045 | } | |
236454df CM |
1046 | found_type = btrfs_file_extent_type(item); |
1047 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1048 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1049 | extent_start = extent_start >> inode->i_blkbits; | |
1050 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
1051 | if (iblock >= extent_start && iblock < extent_end) { | |
1052 | err = 0; | |
1053 | btrfs_map_bh_to_logical(root, result, blocknr + | |
1054 | iblock - extent_start); | |
1055 | goto out; | |
1056 | } | |
1057 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1058 | char *ptr; | |
1059 | char *map; | |
1060 | u32 size; | |
1061 | size = btrfs_file_extent_inline_len(leaf->items + | |
1062 | path->slots[0]); | |
1063 | extent_end = (extent_start + size) >> inode->i_blkbits; | |
1064 | extent_start >>= inode->i_blkbits; | |
1065 | if (iblock < extent_start || iblock > extent_end) { | |
1066 | goto out; | |
1067 | } | |
1068 | ptr = btrfs_file_extent_inline_start(item); | |
1069 | map = kmap(result->b_page); | |
1070 | memcpy(map, ptr, size); | |
1071 | memset(map + size, 0, PAGE_CACHE_SIZE - size); | |
1072 | flush_dcache_page(result->b_page); | |
1073 | kunmap(result->b_page); | |
1074 | set_buffer_uptodate(result); | |
1075 | SetPageChecked(result->b_page); | |
1076 | btrfs_map_bh_to_logical(root, result, 0); | |
dee26a9f | 1077 | } |
dee26a9f | 1078 | out: |
5caf2a00 CM |
1079 | btrfs_release_path(root, path); |
1080 | btrfs_free_path(path); | |
75dfe396 CM |
1081 | return err; |
1082 | } | |
1083 | ||
1084 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1085 | struct buffer_head *result, int create) | |
1086 | { | |
1087 | int err; | |
d6e4a428 | 1088 | struct btrfs_root *root = BTRFS_I(inode)->root; |
75dfe396 | 1089 | mutex_lock(&root->fs_info->fs_mutex); |
e8f05c45 | 1090 | err = btrfs_get_block_lock(inode, iblock, result, create); |
dee26a9f CM |
1091 | mutex_unlock(&root->fs_info->fs_mutex); |
1092 | return err; | |
1093 | } | |
1094 | ||
1095 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1096 | unsigned from, unsigned to) | |
1097 | { | |
6407bf6d | 1098 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f CM |
1099 | } |
1100 | ||
d561c025 CM |
1101 | static void btrfs_write_super(struct super_block *sb) |
1102 | { | |
1103 | btrfs_sync_fs(sb, 1); | |
1104 | } | |
1105 | ||
dee26a9f CM |
1106 | static int btrfs_readpage(struct file *file, struct page *page) |
1107 | { | |
1108 | return mpage_readpage(page, btrfs_get_block); | |
1109 | } | |
1110 | ||
236454df CM |
1111 | /* |
1112 | * While block_write_full_page is writing back the dirty buffers under | |
1113 | * the page lock, whoever dirtied the buffers may decide to clean them | |
1114 | * again at any time. We handle that by only looking at the buffer | |
1115 | * state inside lock_buffer(). | |
1116 | * | |
1117 | * If block_write_full_page() is called for regular writeback | |
1118 | * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a | |
1119 | * locked buffer. This only can happen if someone has written the buffer | |
1120 | * directly, with submit_bh(). At the address_space level PageWriteback | |
1121 | * prevents this contention from occurring. | |
1122 | */ | |
1123 | static int __btrfs_write_full_page(struct inode *inode, struct page *page, | |
1124 | struct writeback_control *wbc) | |
1125 | { | |
1126 | int err; | |
1127 | sector_t block; | |
1128 | sector_t last_block; | |
1129 | struct buffer_head *bh, *head; | |
1130 | const unsigned blocksize = 1 << inode->i_blkbits; | |
1131 | int nr_underway = 0; | |
1132 | ||
1133 | BUG_ON(!PageLocked(page)); | |
1134 | ||
1135 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; | |
1136 | ||
1137 | if (!page_has_buffers(page)) { | |
1138 | create_empty_buffers(page, blocksize, | |
1139 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Be very careful. We have no exclusion from __set_page_dirty_buffers | |
1144 | * here, and the (potentially unmapped) buffers may become dirty at | |
1145 | * any time. If a buffer becomes dirty here after we've inspected it | |
1146 | * then we just miss that fact, and the page stays dirty. | |
1147 | * | |
1148 | * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; | |
1149 | * handle that here by just cleaning them. | |
1150 | */ | |
1151 | ||
1152 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1153 | head = page_buffers(page); | |
1154 | bh = head; | |
1155 | ||
1156 | /* | |
1157 | * Get all the dirty buffers mapped to disk addresses and | |
1158 | * handle any aliases from the underlying blockdev's mapping. | |
1159 | */ | |
1160 | do { | |
1161 | if (block > last_block) { | |
1162 | /* | |
1163 | * mapped buffers outside i_size will occur, because | |
1164 | * this page can be outside i_size when there is a | |
1165 | * truncate in progress. | |
1166 | */ | |
1167 | /* | |
1168 | * The buffer was zeroed by block_write_full_page() | |
1169 | */ | |
1170 | clear_buffer_dirty(bh); | |
1171 | set_buffer_uptodate(bh); | |
1172 | } else if (!buffer_mapped(bh) && buffer_dirty(bh)) { | |
1173 | WARN_ON(bh->b_size != blocksize); | |
1174 | err = btrfs_get_block(inode, block, bh, 0); | |
1175 | if (err) | |
1176 | goto recover; | |
1177 | if (buffer_new(bh)) { | |
1178 | /* blockdev mappings never come here */ | |
1179 | clear_buffer_new(bh); | |
1180 | unmap_underlying_metadata(bh->b_bdev, | |
1181 | bh->b_blocknr); | |
1182 | } | |
1183 | } | |
1184 | bh = bh->b_this_page; | |
1185 | block++; | |
1186 | } while (bh != head); | |
1187 | ||
1188 | do { | |
1189 | if (!buffer_mapped(bh)) | |
1190 | continue; | |
1191 | /* | |
1192 | * If it's a fully non-blocking write attempt and we cannot | |
1193 | * lock the buffer then redirty the page. Note that this can | |
1194 | * potentially cause a busy-wait loop from pdflush and kswapd | |
1195 | * activity, but those code paths have their own higher-level | |
1196 | * throttling. | |
1197 | */ | |
1198 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
1199 | lock_buffer(bh); | |
1200 | } else if (test_set_buffer_locked(bh)) { | |
1201 | redirty_page_for_writepage(wbc, page); | |
1202 | continue; | |
1203 | } | |
1204 | if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) { | |
1205 | mark_buffer_async_write(bh); | |
1206 | } else { | |
1207 | unlock_buffer(bh); | |
1208 | } | |
1209 | } while ((bh = bh->b_this_page) != head); | |
1210 | ||
1211 | /* | |
1212 | * The page and its buffers are protected by PageWriteback(), so we can | |
1213 | * drop the bh refcounts early. | |
1214 | */ | |
1215 | BUG_ON(PageWriteback(page)); | |
1216 | set_page_writeback(page); | |
1217 | ||
1218 | do { | |
1219 | struct buffer_head *next = bh->b_this_page; | |
1220 | if (buffer_async_write(bh)) { | |
1221 | submit_bh(WRITE, bh); | |
1222 | nr_underway++; | |
1223 | } | |
1224 | bh = next; | |
1225 | } while (bh != head); | |
1226 | unlock_page(page); | |
1227 | ||
1228 | err = 0; | |
1229 | done: | |
1230 | if (nr_underway == 0) { | |
1231 | /* | |
1232 | * The page was marked dirty, but the buffers were | |
1233 | * clean. Someone wrote them back by hand with | |
1234 | * ll_rw_block/submit_bh. A rare case. | |
1235 | */ | |
1236 | int uptodate = 1; | |
1237 | do { | |
1238 | if (!buffer_uptodate(bh)) { | |
1239 | uptodate = 0; | |
1240 | break; | |
1241 | } | |
1242 | bh = bh->b_this_page; | |
1243 | } while (bh != head); | |
1244 | if (uptodate) | |
1245 | SetPageUptodate(page); | |
1246 | end_page_writeback(page); | |
1247 | /* | |
1248 | * The page and buffer_heads can be released at any time from | |
1249 | * here on. | |
1250 | */ | |
1251 | wbc->pages_skipped++; /* We didn't write this page */ | |
1252 | } | |
1253 | return err; | |
1254 | ||
1255 | recover: | |
1256 | /* | |
1257 | * ENOSPC, or some other error. We may already have added some | |
1258 | * blocks to the file, so we need to write these out to avoid | |
1259 | * exposing stale data. | |
1260 | * The page is currently locked and not marked for writeback | |
1261 | */ | |
1262 | bh = head; | |
1263 | /* Recovery: lock and submit the mapped buffers */ | |
1264 | do { | |
1265 | if (buffer_mapped(bh) && buffer_dirty(bh)) { | |
1266 | lock_buffer(bh); | |
1267 | mark_buffer_async_write(bh); | |
1268 | } else { | |
1269 | /* | |
1270 | * The buffer may have been set dirty during | |
1271 | * attachment to a dirty page. | |
1272 | */ | |
1273 | clear_buffer_dirty(bh); | |
1274 | } | |
1275 | } while ((bh = bh->b_this_page) != head); | |
1276 | SetPageError(page); | |
1277 | BUG_ON(PageWriteback(page)); | |
1278 | set_page_writeback(page); | |
1279 | do { | |
1280 | struct buffer_head *next = bh->b_this_page; | |
1281 | if (buffer_async_write(bh)) { | |
1282 | clear_buffer_dirty(bh); | |
1283 | submit_bh(WRITE, bh); | |
1284 | nr_underway++; | |
1285 | } | |
1286 | bh = next; | |
1287 | } while (bh != head); | |
1288 | unlock_page(page); | |
1289 | goto done; | |
1290 | } | |
1291 | ||
1292 | /* | |
1293 | * The generic ->writepage function for buffer-backed address_spaces | |
1294 | */ | |
dee26a9f CM |
1295 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
1296 | { | |
236454df CM |
1297 | struct inode * const inode = page->mapping->host; |
1298 | loff_t i_size = i_size_read(inode); | |
1299 | const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
1300 | unsigned offset; | |
1301 | void *kaddr; | |
1302 | ||
1303 | /* Is the page fully inside i_size? */ | |
1304 | if (page->index < end_index) | |
1305 | return __btrfs_write_full_page(inode, page, wbc); | |
1306 | ||
1307 | /* Is the page fully outside i_size? (truncate in progress) */ | |
1308 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
1309 | if (page->index >= end_index+1 || !offset) { | |
1310 | /* | |
1311 | * The page may have dirty, unmapped buffers. For example, | |
1312 | * they may have been added in ext3_writepage(). Make them | |
1313 | * freeable here, so the page does not leak. | |
1314 | */ | |
1315 | block_invalidatepage(page, 0); | |
1316 | unlock_page(page); | |
1317 | return 0; /* don't care */ | |
1318 | } | |
1319 | ||
1320 | /* | |
1321 | * The page straddles i_size. It must be zeroed out on each and every | |
1322 | * writepage invokation because it may be mmapped. "A file is mapped | |
1323 | * in multiples of the page size. For a file that is not a multiple of | |
1324 | * the page size, the remaining memory is zeroed when mapped, and | |
1325 | * writes to that region are not written out to the file." | |
1326 | */ | |
1327 | kaddr = kmap_atomic(page, KM_USER0); | |
1328 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1329 | flush_dcache_page(page); | |
1330 | kunmap_atomic(kaddr, KM_USER0); | |
1331 | return __btrfs_write_full_page(inode, page, wbc); | |
dee26a9f | 1332 | } |
d561c025 | 1333 | |
f4b9aa8d CM |
1334 | static void btrfs_truncate(struct inode *inode) |
1335 | { | |
d6e4a428 | 1336 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
1337 | int ret; |
1338 | struct btrfs_trans_handle *trans; | |
1339 | ||
1340 | if (!S_ISREG(inode->i_mode)) | |
1341 | return; | |
1342 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1343 | return; | |
1344 | ||
e8f05c45 | 1345 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d CM |
1346 | |
1347 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1348 | mutex_lock(&root->fs_info->fs_mutex); | |
1349 | trans = btrfs_start_transaction(root, 1); | |
1350 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
1351 | BUG_ON(ret); | |
1352 | ret = btrfs_end_transaction(trans, root); | |
1353 | BUG_ON(ret); | |
1354 | mutex_unlock(&root->fs_info->fs_mutex); | |
1355 | mark_inode_dirty(inode); | |
1356 | } | |
1357 | ||
236454df CM |
1358 | /* |
1359 | * Make sure any changes to nobh_commit_write() are reflected in | |
1360 | * nobh_truncate_page(), since it doesn't call commit_write(). | |
1361 | */ | |
1362 | static int btrfs_commit_write(struct file *file, struct page *page, | |
1363 | unsigned from, unsigned to) | |
1364 | { | |
1365 | struct inode *inode = page->mapping->host; | |
1366 | struct buffer_head *bh; | |
1367 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1368 | ||
1369 | SetPageUptodate(page); | |
1370 | bh = page_buffers(page); | |
1371 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { | |
1372 | set_page_dirty(page); | |
1373 | } | |
1374 | if (pos > inode->i_size) { | |
1375 | i_size_write(inode, pos); | |
1376 | mark_inode_dirty(inode); | |
1377 | } | |
1378 | return 0; | |
1379 | } | |
1380 | ||
75dfe396 CM |
1381 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1382 | struct page **prepared_pages, | |
1383 | const char __user * buf) | |
1384 | { | |
1385 | long page_fault = 0; | |
1386 | int i; | |
1387 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1388 | ||
1389 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1390 | size_t count = min_t(size_t, | |
1391 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1392 | struct page *page = prepared_pages[i]; | |
1393 | fault_in_pages_readable(buf, count); | |
1394 | ||
1395 | /* Copy data from userspace to the current page */ | |
1396 | kmap(page); | |
1397 | page_fault = __copy_from_user(page_address(page) + offset, | |
1398 | buf, count); | |
1399 | /* Flush processor's dcache for this page */ | |
1400 | flush_dcache_page(page); | |
1401 | kunmap(page); | |
1402 | buf += count; | |
1403 | write_bytes -= count; | |
1404 | ||
1405 | if (page_fault) | |
1406 | break; | |
1407 | } | |
1408 | return page_fault ? -EFAULT : 0; | |
1409 | } | |
1410 | ||
1411 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1412 | { | |
1413 | size_t i; | |
1414 | for (i = 0; i < num_pages; i++) { | |
1415 | if (!pages[i]) | |
1416 | break; | |
1417 | unlock_page(pages[i]); | |
1418 | mark_page_accessed(pages[i]); | |
1419 | page_cache_release(pages[i]); | |
1420 | } | |
1421 | } | |
1422 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1423 | struct btrfs_root *root, | |
1424 | struct file *file, | |
1425 | struct page **pages, | |
1426 | size_t num_pages, | |
1427 | loff_t pos, | |
1428 | size_t write_bytes) | |
1429 | { | |
1430 | int i; | |
1431 | int offset; | |
1432 | int err = 0; | |
1433 | int ret; | |
1434 | int this_write; | |
f254e52c | 1435 | struct inode *inode = file->f_path.dentry->d_inode; |
236454df CM |
1436 | struct buffer_head *bh; |
1437 | struct btrfs_file_extent_item *ei; | |
75dfe396 CM |
1438 | |
1439 | for (i = 0; i < num_pages; i++) { | |
1440 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1441 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1442 | /* FIXME, one block at a time */ |
1443 | ||
1444 | mutex_lock(&root->fs_info->fs_mutex); | |
1445 | trans = btrfs_start_transaction(root, 1); | |
236454df CM |
1446 | |
1447 | bh = page_buffers(pages[i]); | |
1448 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
1449 | struct btrfs_key key; | |
1450 | struct btrfs_path *path; | |
1451 | char *ptr; | |
1452 | u32 datasize; | |
1453 | ||
1454 | path = btrfs_alloc_path(); | |
1455 | BUG_ON(!path); | |
1456 | key.objectid = inode->i_ino; | |
1457 | key.offset = pages[i]->index << PAGE_CACHE_SHIFT; | |
1458 | key.flags = 0; | |
1459 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
1460 | BUG_ON(write_bytes >= PAGE_CACHE_SIZE); | |
1461 | datasize = offset + | |
1462 | btrfs_file_extent_calc_inline_size(write_bytes); | |
1463 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1464 | datasize); | |
1465 | BUG_ON(ret); | |
1466 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1467 | path->slots[0], struct btrfs_file_extent_item); | |
1468 | btrfs_set_file_extent_generation(ei, trans->transid); | |
1469 | btrfs_set_file_extent_type(ei, | |
1470 | BTRFS_FILE_EXTENT_INLINE); | |
1471 | ptr = btrfs_file_extent_inline_start(ei); | |
1472 | memcpy(ptr, bh->b_data, offset + write_bytes); | |
1473 | mark_buffer_dirty(path->nodes[0]); | |
1474 | btrfs_free_path(path); | |
1475 | } else { | |
1476 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
f254e52c CM |
1477 | pages[i]->index << PAGE_CACHE_SHIFT, |
1478 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
236454df CM |
1479 | kunmap(pages[i]); |
1480 | } | |
f254e52c CM |
1481 | SetPageChecked(pages[i]); |
1482 | ret = btrfs_end_transaction(trans, root); | |
1483 | BUG_ON(ret); | |
1484 | mutex_unlock(&root->fs_info->fs_mutex); | |
1485 | ||
236454df | 1486 | ret = btrfs_commit_write(file, pages[i], offset, |
75dfe396 CM |
1487 | offset + this_write); |
1488 | pos += this_write; | |
1489 | if (ret) { | |
1490 | err = ret; | |
1491 | goto failed; | |
1492 | } | |
1493 | WARN_ON(this_write > write_bytes); | |
1494 | write_bytes -= this_write; | |
1495 | } | |
1496 | failed: | |
1497 | return err; | |
1498 | } | |
1499 | ||
b18c6685 CM |
1500 | static int drop_extents(struct btrfs_trans_handle *trans, |
1501 | struct btrfs_root *root, | |
1502 | struct inode *inode, | |
1503 | u64 start, u64 end) | |
1504 | { | |
1505 | int ret; | |
1506 | struct btrfs_key key; | |
1507 | struct btrfs_leaf *leaf; | |
1508 | int slot; | |
1509 | struct btrfs_file_extent_item *extent; | |
236454df | 1510 | u64 extent_end = 0; |
b18c6685 CM |
1511 | int keep; |
1512 | struct btrfs_file_extent_item old; | |
1513 | struct btrfs_path *path; | |
1514 | u64 search_start = start; | |
1515 | int bookend; | |
236454df CM |
1516 | int found_type; |
1517 | int found_extent; | |
1518 | int found_inline; | |
1519 | ||
b18c6685 CM |
1520 | path = btrfs_alloc_path(); |
1521 | if (!path) | |
1522 | return -ENOMEM; | |
a429e513 CM |
1523 | while(1) { |
1524 | btrfs_release_path(root, path); | |
1525 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
1526 | search_start, -1); | |
1527 | if (ret < 0) | |
70b2befd | 1528 | goto out; |
a429e513 CM |
1529 | if (ret > 0) { |
1530 | if (path->slots[0] == 0) { | |
236454df | 1531 | ret = 0; |
a429e513 CM |
1532 | goto out; |
1533 | } | |
1534 | path->slots[0]--; | |
70b2befd | 1535 | } |
b18c6685 CM |
1536 | keep = 0; |
1537 | bookend = 0; | |
236454df CM |
1538 | found_extent = 0; |
1539 | found_inline = 0; | |
1540 | extent = NULL; | |
b18c6685 CM |
1541 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
1542 | slot = path->slots[0]; | |
1543 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
b18c6685 CM |
1544 | if (key.offset >= end || key.objectid != inode->i_ino) { |
1545 | ret = 0; | |
1546 | goto out; | |
1547 | } | |
236454df CM |
1548 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) { |
1549 | ret = 0; | |
1550 | goto out; | |
1551 | } | |
1552 | extent = btrfs_item_ptr(leaf, slot, | |
1553 | struct btrfs_file_extent_item); | |
1554 | found_type = btrfs_file_extent_type(extent); | |
1555 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1556 | extent_end = key.offset + | |
1557 | (btrfs_file_extent_num_blocks(extent) << | |
1558 | inode->i_blkbits); | |
1559 | found_extent = 1; | |
1560 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1561 | found_inline = 1; | |
1562 | extent_end = key.offset + | |
1563 | btrfs_file_extent_inline_len(leaf->items + slot); | |
1564 | } | |
1565 | ||
1566 | if (!found_extent && !found_inline) { | |
1567 | ret = 0; | |
a429e513 | 1568 | goto out; |
236454df CM |
1569 | } |
1570 | ||
1571 | if (search_start >= extent_end) { | |
1572 | ret = 0; | |
a429e513 | 1573 | goto out; |
236454df CM |
1574 | } |
1575 | ||
a429e513 | 1576 | search_start = extent_end; |
b18c6685 CM |
1577 | |
1578 | if (end < extent_end && end >= key.offset) { | |
236454df CM |
1579 | if (found_extent) { |
1580 | memcpy(&old, extent, sizeof(old)); | |
1581 | ret = btrfs_inc_extent_ref(trans, root, | |
1582 | btrfs_file_extent_disk_blocknr(&old), | |
1583 | btrfs_file_extent_disk_num_blocks(&old)); | |
1584 | BUG_ON(ret); | |
1585 | } | |
1586 | WARN_ON(found_inline); | |
b18c6685 CM |
1587 | bookend = 1; |
1588 | } | |
1589 | ||
1590 | if (start > key.offset) { | |
1591 | u64 new_num; | |
a429e513 | 1592 | u64 old_num; |
b18c6685 CM |
1593 | /* truncate existing extent */ |
1594 | keep = 1; | |
1595 | WARN_ON(start & (root->blocksize - 1)); | |
236454df CM |
1596 | if (found_extent) { |
1597 | new_num = (start - key.offset) >> | |
1598 | inode->i_blkbits; | |
1599 | old_num = btrfs_file_extent_num_blocks(extent); | |
1600 | inode->i_blocks -= (old_num - new_num) << 3; | |
1601 | btrfs_set_file_extent_num_blocks(extent, | |
1602 | new_num); | |
1603 | mark_buffer_dirty(path->nodes[0]); | |
1604 | } else { | |
1605 | WARN_ON(1); | |
1606 | /* | |
1607 | ret = btrfs_truncate_item(trans, root, path, | |
1608 | start - key.offset); | |
1609 | BUG_ON(ret); | |
1610 | */ | |
1611 | } | |
b18c6685 CM |
1612 | } |
1613 | if (!keep) { | |
236454df CM |
1614 | u64 disk_blocknr = 0; |
1615 | u64 disk_num_blocks = 0; | |
1616 | u64 extent_num_blocks = 0; | |
1617 | if (found_extent) { | |
1618 | disk_blocknr = | |
1619 | btrfs_file_extent_disk_blocknr(extent); | |
1620 | disk_num_blocks = | |
1621 | btrfs_file_extent_disk_num_blocks(extent); | |
1622 | extent_num_blocks = | |
1623 | btrfs_file_extent_num_blocks(extent); | |
1624 | } | |
b18c6685 CM |
1625 | ret = btrfs_del_item(trans, root, path); |
1626 | BUG_ON(ret); | |
1627 | btrfs_release_path(root, path); | |
236454df CM |
1628 | if (found_extent) { |
1629 | inode->i_blocks -= | |
1630 | btrfs_file_extent_num_blocks(extent) << 3; | |
1631 | ret = btrfs_free_extent(trans, root, | |
1632 | disk_blocknr, | |
1633 | disk_num_blocks, 0); | |
1634 | } | |
b18c6685 CM |
1635 | |
1636 | BUG_ON(ret); | |
1637 | if (!bookend && search_start >= end) { | |
1638 | ret = 0; | |
1639 | goto out; | |
1640 | } | |
1641 | if (!bookend) | |
a429e513 | 1642 | continue; |
b18c6685 | 1643 | } |
236454df | 1644 | if (bookend && found_extent) { |
b18c6685 CM |
1645 | /* create bookend */ |
1646 | struct btrfs_key ins; | |
b18c6685 CM |
1647 | ins.objectid = inode->i_ino; |
1648 | ins.offset = end; | |
1649 | ins.flags = 0; | |
1650 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); | |
1651 | ||
1652 | btrfs_release_path(root, path); | |
b18c6685 CM |
1653 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
1654 | sizeof(*extent)); | |
1655 | BUG_ON(ret); | |
1656 | extent = btrfs_item_ptr( | |
1657 | btrfs_buffer_leaf(path->nodes[0]), | |
1658 | path->slots[0], | |
1659 | struct btrfs_file_extent_item); | |
1660 | btrfs_set_file_extent_disk_blocknr(extent, | |
1661 | btrfs_file_extent_disk_blocknr(&old)); | |
1662 | btrfs_set_file_extent_disk_num_blocks(extent, | |
1663 | btrfs_file_extent_disk_num_blocks(&old)); | |
1664 | ||
1665 | btrfs_set_file_extent_offset(extent, | |
1666 | btrfs_file_extent_offset(&old) + | |
1667 | ((end - key.offset) >> inode->i_blkbits)); | |
1668 | WARN_ON(btrfs_file_extent_num_blocks(&old) < | |
1669 | (end - key.offset) >> inode->i_blkbits); | |
1670 | btrfs_set_file_extent_num_blocks(extent, | |
1671 | btrfs_file_extent_num_blocks(&old) - | |
1672 | ((end - key.offset) >> inode->i_blkbits)); | |
1673 | ||
236454df CM |
1674 | btrfs_set_file_extent_type(extent, |
1675 | BTRFS_FILE_EXTENT_REG); | |
b18c6685 CM |
1676 | btrfs_set_file_extent_generation(extent, |
1677 | btrfs_file_extent_generation(&old)); | |
b18c6685 | 1678 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a429e513 CM |
1679 | inode->i_blocks += |
1680 | btrfs_file_extent_num_blocks(extent) << 3; | |
b18c6685 | 1681 | ret = 0; |
70b2befd | 1682 | goto out; |
b18c6685 | 1683 | } |
b18c6685 | 1684 | } |
b18c6685 | 1685 | out: |
b18c6685 CM |
1686 | btrfs_free_path(path); |
1687 | return ret; | |
1688 | } | |
1689 | ||
1690 | static int prepare_pages(struct btrfs_root *root, | |
75dfe396 CM |
1691 | struct file *file, |
1692 | struct page **pages, | |
1693 | size_t num_pages, | |
1694 | loff_t pos, | |
2932f3ec CM |
1695 | unsigned long first_index, |
1696 | unsigned long last_index, | |
6567e837 CM |
1697 | size_t write_bytes, |
1698 | u64 alloc_extent_start) | |
75dfe396 CM |
1699 | { |
1700 | int i; | |
1701 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
1702 | struct inode *inode = file->f_path.dentry->d_inode; | |
1703 | int offset; | |
1704 | int err = 0; | |
75dfe396 | 1705 | int this_write; |
6567e837 CM |
1706 | struct buffer_head *bh; |
1707 | struct buffer_head *head; | |
75dfe396 CM |
1708 | loff_t isize = i_size_read(inode); |
1709 | ||
1710 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
1711 | ||
1712 | for (i = 0; i < num_pages; i++) { | |
1713 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
1714 | if (!pages[i]) { | |
1715 | err = -ENOMEM; | |
1716 | goto failed_release; | |
1717 | } | |
1718 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1719 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
6567e837 CM |
1720 | create_empty_buffers(pages[i], root->fs_info->sb->s_blocksize, |
1721 | (1 << BH_Uptodate)); | |
1722 | head = page_buffers(pages[i]); | |
1723 | bh = head; | |
1724 | do { | |
1725 | err = btrfs_map_bh_to_logical(root, bh, | |
1726 | alloc_extent_start); | |
1727 | BUG_ON(err); | |
1728 | if (err) | |
1729 | goto failed_truncate; | |
1730 | bh = bh->b_this_page; | |
236454df CM |
1731 | if (alloc_extent_start) |
1732 | alloc_extent_start++; | |
6567e837 | 1733 | } while (bh != head); |
75dfe396 | 1734 | pos += this_write; |
75dfe396 CM |
1735 | WARN_ON(this_write > write_bytes); |
1736 | write_bytes -= this_write; | |
1737 | } | |
1738 | return 0; | |
1739 | ||
1740 | failed_release: | |
1741 | btrfs_drop_pages(pages, num_pages); | |
1742 | return err; | |
1743 | ||
1744 | failed_truncate: | |
1745 | btrfs_drop_pages(pages, num_pages); | |
1746 | if (pos > isize) | |
1747 | vmtruncate(inode, isize); | |
1748 | return err; | |
1749 | } | |
1750 | ||
1751 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
1752 | size_t count, loff_t *ppos) | |
1753 | { | |
1754 | loff_t pos; | |
1755 | size_t num_written = 0; | |
1756 | int err = 0; | |
1757 | int ret = 0; | |
75dfe396 | 1758 | struct inode *inode = file->f_path.dentry->d_inode; |
d6e4a428 | 1759 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b18c6685 | 1760 | struct page *pages[8]; |
a429e513 | 1761 | struct page *pinned[2] = { NULL, NULL }; |
2932f3ec CM |
1762 | unsigned long first_index; |
1763 | unsigned long last_index; | |
6567e837 CM |
1764 | u64 start_pos; |
1765 | u64 num_blocks; | |
1766 | u64 alloc_extent_start; | |
6567e837 | 1767 | struct btrfs_trans_handle *trans; |
b18c6685 | 1768 | struct btrfs_key ins; |
75dfe396 CM |
1769 | |
1770 | if (file->f_flags & O_DIRECT) | |
1771 | return -EINVAL; | |
1772 | pos = *ppos; | |
75dfe396 CM |
1773 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
1774 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1775 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1776 | if (err) | |
1777 | goto out; | |
1778 | if (count == 0) | |
1779 | goto out; | |
1780 | err = remove_suid(file->f_path.dentry); | |
1781 | if (err) | |
1782 | goto out; | |
1783 | file_update_time(file); | |
a429e513 CM |
1784 | |
1785 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); | |
1786 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> | |
1787 | inode->i_blkbits; | |
1788 | ||
75dfe396 | 1789 | mutex_lock(&inode->i_mutex); |
2932f3ec CM |
1790 | first_index = pos >> PAGE_CACHE_SHIFT; |
1791 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
6567e837 | 1792 | |
a429e513 CM |
1793 | if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size && |
1794 | (pos & (PAGE_CACHE_SIZE - 1))) { | |
1795 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); | |
1796 | if (!PageUptodate(pinned[0])) { | |
1797 | ret = mpage_readpage(pinned[0], btrfs_get_block); | |
1798 | BUG_ON(ret); | |
1799 | } else { | |
1800 | unlock_page(pinned[0]); | |
1801 | } | |
1802 | } | |
1803 | if (first_index != last_index && | |
1804 | (last_index << PAGE_CACHE_SHIFT) < inode->i_size && | |
1805 | (count & (PAGE_CACHE_SIZE - 1))) { | |
1806 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); | |
1807 | if (!PageUptodate(pinned[1])) { | |
1808 | ret = mpage_readpage(pinned[1], btrfs_get_block); | |
1809 | BUG_ON(ret); | |
1810 | } else { | |
1811 | unlock_page(pinned[1]); | |
1812 | } | |
1813 | } | |
1814 | ||
6567e837 CM |
1815 | mutex_lock(&root->fs_info->fs_mutex); |
1816 | trans = btrfs_start_transaction(root, 1); | |
1817 | if (!trans) { | |
1818 | err = -ENOMEM; | |
b18c6685 | 1819 | mutex_unlock(&root->fs_info->fs_mutex); |
6567e837 CM |
1820 | goto out_unlock; |
1821 | } | |
a429e513 CM |
1822 | /* FIXME blocksize != 4096 */ |
1823 | inode->i_blocks += num_blocks << 3; | |
b18c6685 | 1824 | if (start_pos < inode->i_size) { |
a429e513 | 1825 | /* FIXME blocksize != pagesize */ |
b18c6685 CM |
1826 | ret = drop_extents(trans, root, inode, |
1827 | start_pos, | |
1828 | (pos + count + root->blocksize -1) & | |
a429e513 | 1829 | ~((u64)root->blocksize - 1)); |
236454df | 1830 | BUG_ON(ret); |
b18c6685 | 1831 | } |
236454df CM |
1832 | if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size || |
1833 | pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) { | |
4d775673 | 1834 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, |
c62a1920 | 1835 | num_blocks, 1, (u64)-1, &ins); |
236454df CM |
1836 | BUG_ON(ret); |
1837 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
b18c6685 | 1838 | start_pos, ins.objectid, ins.offset); |
236454df CM |
1839 | BUG_ON(ret); |
1840 | } else { | |
1841 | ins.offset = 0; | |
1842 | ins.objectid = 0; | |
1843 | } | |
6567e837 | 1844 | BUG_ON(ret); |
b18c6685 CM |
1845 | alloc_extent_start = ins.objectid; |
1846 | ret = btrfs_end_transaction(trans, root); | |
6567e837 CM |
1847 | mutex_unlock(&root->fs_info->fs_mutex); |
1848 | ||
75dfe396 CM |
1849 | while(count > 0) { |
1850 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1851 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1852 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
1853 | PAGE_CACHE_SHIFT; | |
b18c6685 CM |
1854 | |
1855 | memset(pages, 0, sizeof(pages)); | |
1856 | ret = prepare_pages(root, file, pages, num_pages, | |
6567e837 CM |
1857 | pos, first_index, last_index, |
1858 | write_bytes, alloc_extent_start); | |
75dfe396 | 1859 | BUG_ON(ret); |
b18c6685 | 1860 | |
6567e837 | 1861 | /* FIXME blocks != pagesize */ |
236454df CM |
1862 | if (alloc_extent_start) |
1863 | alloc_extent_start += num_pages; | |
75dfe396 CM |
1864 | ret = btrfs_copy_from_user(pos, num_pages, |
1865 | write_bytes, pages, buf); | |
1866 | BUG_ON(ret); | |
1867 | ||
f254e52c | 1868 | ret = dirty_and_release_pages(NULL, root, file, pages, |
70b2befd | 1869 | num_pages, pos, write_bytes); |
75dfe396 CM |
1870 | BUG_ON(ret); |
1871 | btrfs_drop_pages(pages, num_pages); | |
1872 | ||
75dfe396 CM |
1873 | buf += write_bytes; |
1874 | count -= write_bytes; | |
1875 | pos += write_bytes; | |
1876 | num_written += write_bytes; | |
1877 | ||
1878 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
1879 | cond_resched(); | |
1880 | } | |
6567e837 | 1881 | out_unlock: |
75dfe396 CM |
1882 | mutex_unlock(&inode->i_mutex); |
1883 | out: | |
a429e513 CM |
1884 | if (pinned[0]) |
1885 | page_cache_release(pinned[0]); | |
1886 | if (pinned[1]) | |
1887 | page_cache_release(pinned[1]); | |
75dfe396 CM |
1888 | *ppos = pos; |
1889 | current->backing_dev_info = NULL; | |
a429e513 | 1890 | mark_inode_dirty(inode); |
75dfe396 CM |
1891 | return num_written ? num_written : err; |
1892 | } | |
1893 | ||
f254e52c CM |
1894 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
1895 | unsigned long offset, unsigned long size) | |
1896 | { | |
1897 | char *kaddr; | |
1898 | unsigned long left, count = desc->count; | |
d6e4a428 | 1899 | struct inode *inode = page->mapping->host; |
f254e52c CM |
1900 | |
1901 | if (size > count) | |
1902 | size = count; | |
1903 | ||
1904 | if (!PageChecked(page)) { | |
1905 | /* FIXME, do it per block */ | |
d6e4a428 | 1906 | struct btrfs_root *root = BTRFS_I(inode)->root; |
236454df | 1907 | |
f254e52c | 1908 | int ret = btrfs_csum_verify_file_block(root, |
236454df CM |
1909 | page->mapping->host->i_ino, |
1910 | page->index << PAGE_CACHE_SHIFT, | |
1911 | kmap(page), PAGE_CACHE_SIZE); | |
f254e52c CM |
1912 | if (ret) { |
1913 | printk("failed to verify ino %lu page %lu\n", | |
1914 | page->mapping->host->i_ino, | |
1915 | page->index); | |
1916 | memset(page_address(page), 0, PAGE_CACHE_SIZE); | |
1917 | } | |
1918 | SetPageChecked(page); | |
1919 | kunmap(page); | |
1920 | } | |
1921 | /* | |
1922 | * Faults on the destination of a read are common, so do it before | |
1923 | * taking the kmap. | |
1924 | */ | |
1925 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
1926 | kaddr = kmap_atomic(page, KM_USER0); | |
1927 | left = __copy_to_user_inatomic(desc->arg.buf, | |
1928 | kaddr + offset, size); | |
1929 | kunmap_atomic(kaddr, KM_USER0); | |
1930 | if (left == 0) | |
1931 | goto success; | |
1932 | } | |
1933 | ||
1934 | /* Do it the slow way */ | |
1935 | kaddr = kmap(page); | |
1936 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
1937 | kunmap(page); | |
1938 | ||
1939 | if (left) { | |
1940 | size -= left; | |
1941 | desc->error = -EFAULT; | |
1942 | } | |
1943 | success: | |
1944 | desc->count = count - size; | |
1945 | desc->written += size; | |
1946 | desc->arg.buf += size; | |
1947 | return size; | |
1948 | } | |
1949 | ||
1950 | /** | |
1951 | * btrfs_file_aio_read - filesystem read routine | |
1952 | * @iocb: kernel I/O control block | |
1953 | * @iov: io vector request | |
1954 | * @nr_segs: number of segments in the iovec | |
1955 | * @pos: current file position | |
1956 | */ | |
1957 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
1958 | unsigned long nr_segs, loff_t pos) | |
1959 | { | |
1960 | struct file *filp = iocb->ki_filp; | |
1961 | ssize_t retval; | |
1962 | unsigned long seg; | |
1963 | size_t count; | |
1964 | loff_t *ppos = &iocb->ki_pos; | |
1965 | ||
1966 | count = 0; | |
1967 | for (seg = 0; seg < nr_segs; seg++) { | |
1968 | const struct iovec *iv = &iov[seg]; | |
1969 | ||
1970 | /* | |
1971 | * If any segment has a negative length, or the cumulative | |
1972 | * length ever wraps negative then return -EINVAL. | |
1973 | */ | |
1974 | count += iv->iov_len; | |
1975 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
1976 | return -EINVAL; | |
1977 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
1978 | continue; | |
1979 | if (seg == 0) | |
1980 | return -EFAULT; | |
1981 | nr_segs = seg; | |
1982 | count -= iv->iov_len; /* This segment is no good */ | |
1983 | break; | |
1984 | } | |
1985 | retval = 0; | |
1986 | if (count) { | |
1987 | for (seg = 0; seg < nr_segs; seg++) { | |
1988 | read_descriptor_t desc; | |
1989 | ||
1990 | desc.written = 0; | |
1991 | desc.arg.buf = iov[seg].iov_base; | |
1992 | desc.count = iov[seg].iov_len; | |
1993 | if (desc.count == 0) | |
1994 | continue; | |
1995 | desc.error = 0; | |
1996 | do_generic_file_read(filp, ppos, &desc, | |
1997 | btrfs_read_actor); | |
1998 | retval += desc.written; | |
1999 | if (desc.error) { | |
2000 | retval = retval ?: desc.error; | |
2001 | break; | |
2002 | } | |
2003 | } | |
2004 | } | |
2005 | return retval; | |
2006 | } | |
2007 | ||
2619ba1f CM |
2008 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
2009 | { | |
2010 | struct btrfs_trans_handle *trans; | |
2011 | struct btrfs_key key; | |
2012 | struct btrfs_root_item root_item; | |
2013 | struct btrfs_inode_item *inode_item; | |
2014 | struct buffer_head *subvol; | |
2015 | struct btrfs_leaf *leaf; | |
2016 | struct btrfs_root *new_root; | |
2017 | struct inode *inode; | |
2018 | int ret; | |
2019 | u64 objectid; | |
2020 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
2021 | ||
2022 | mutex_lock(&root->fs_info->fs_mutex); | |
2023 | trans = btrfs_start_transaction(root, 1); | |
2024 | BUG_ON(!trans); | |
2025 | ||
2026 | subvol = btrfs_alloc_free_block(trans, root); | |
5e82849e CM |
2027 | if (subvol == NULL) |
2028 | return -ENOSPC; | |
2619ba1f CM |
2029 | leaf = btrfs_buffer_leaf(subvol); |
2030 | btrfs_set_header_nritems(&leaf->header, 0); | |
2031 | btrfs_set_header_level(&leaf->header, 0); | |
7eccb903 | 2032 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
2619ba1f | 2033 | btrfs_set_header_generation(&leaf->header, trans->transid); |
4d775673 | 2034 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); |
2619ba1f CM |
2035 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, |
2036 | sizeof(leaf->header.fsid)); | |
4d775673 | 2037 | mark_buffer_dirty(subvol); |
2619ba1f CM |
2038 | |
2039 | inode_item = &root_item.inode; | |
2040 | memset(inode_item, 0, sizeof(*inode_item)); | |
2041 | btrfs_set_inode_generation(inode_item, 1); | |
2042 | btrfs_set_inode_size(inode_item, 3); | |
2043 | btrfs_set_inode_nlink(inode_item, 1); | |
2044 | btrfs_set_inode_nblocks(inode_item, 1); | |
2045 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
2046 | ||
7eccb903 | 2047 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
2619ba1f | 2048 | btrfs_set_root_refs(&root_item, 1); |
5e82849e CM |
2049 | brelse(subvol); |
2050 | subvol = NULL; | |
2619ba1f | 2051 | |
2619ba1f CM |
2052 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2053 | 0, &objectid); | |
2054 | BUG_ON(ret); | |
2055 | ||
2056 | btrfs_set_root_dirid(&root_item, new_dirid); | |
2057 | ||
2058 | key.objectid = objectid; | |
2059 | key.offset = 1; | |
2060 | key.flags = 0; | |
2061 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
2062 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2063 | &root_item); | |
2064 | BUG_ON(ret); | |
2065 | ||
2066 | /* | |
2067 | * insert the directory item | |
2068 | */ | |
2069 | key.offset = (u64)-1; | |
2070 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2071 | name, namelen, | |
2072 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2073 | &key, 0); | |
2074 | BUG_ON(ret); | |
2075 | ||
2076 | ret = btrfs_commit_transaction(trans, root); | |
2077 | BUG_ON(ret); | |
2078 | ||
2079 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
2080 | BUG_ON(!new_root); | |
2081 | ||
2082 | trans = btrfs_start_transaction(new_root, 1); | |
2083 | BUG_ON(!trans); | |
2084 | ||
2085 | inode = btrfs_new_inode(trans, new_root, new_dirid, S_IFDIR | 0700); | |
2086 | inode->i_op = &btrfs_dir_inode_operations; | |
2087 | inode->i_fop = &btrfs_dir_file_operations; | |
2088 | ||
2089 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
2090 | BUG_ON(ret); | |
2091 | ||
2092 | inode->i_nlink = 1; | |
2093 | inode->i_size = 6; | |
2094 | ret = btrfs_update_inode(trans, new_root, inode); | |
2095 | BUG_ON(ret); | |
2096 | ||
2097 | ret = btrfs_commit_transaction(trans, new_root); | |
2098 | BUG_ON(ret); | |
2099 | ||
2100 | iput(inode); | |
2101 | ||
2102 | mutex_unlock(&root->fs_info->fs_mutex); | |
2103 | return 0; | |
2104 | } | |
2105 | ||
c5739bba CM |
2106 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
2107 | { | |
2108 | struct btrfs_trans_handle *trans; | |
2109 | struct btrfs_key key; | |
2110 | struct btrfs_root_item new_root_item; | |
2111 | int ret; | |
2112 | u64 objectid; | |
2113 | ||
2619ba1f CM |
2114 | if (!root->ref_cows) |
2115 | return -EINVAL; | |
2116 | ||
c5739bba CM |
2117 | mutex_lock(&root->fs_info->fs_mutex); |
2118 | trans = btrfs_start_transaction(root, 1); | |
2119 | BUG_ON(!trans); | |
2120 | ||
2121 | ret = btrfs_update_inode(trans, root, root->inode); | |
2122 | BUG_ON(ret); | |
2123 | ||
1b05da2e CM |
2124 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2125 | 0, &objectid); | |
c5739bba CM |
2126 | BUG_ON(ret); |
2127 | ||
c5739bba CM |
2128 | memcpy(&new_root_item, &root->root_item, |
2129 | sizeof(new_root_item)); | |
2130 | ||
c5739bba CM |
2131 | key.objectid = objectid; |
2132 | key.offset = 1; | |
2133 | key.flags = 0; | |
2134 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
7eccb903 | 2135 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
c5739bba CM |
2136 | |
2137 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2138 | &new_root_item); | |
2139 | BUG_ON(ret); | |
2140 | ||
c5739bba CM |
2141 | /* |
2142 | * insert the directory item | |
2143 | */ | |
2144 | key.offset = (u64)-1; | |
2145 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2146 | name, namelen, | |
2147 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2148 | &key, 0); | |
2149 | ||
2150 | BUG_ON(ret); | |
2151 | ||
2152 | ret = btrfs_inc_root_ref(trans, root); | |
2153 | BUG_ON(ret); | |
2154 | ||
2155 | ret = btrfs_commit_transaction(trans, root); | |
2156 | BUG_ON(ret); | |
2157 | mutex_unlock(&root->fs_info->fs_mutex); | |
2158 | return 0; | |
2159 | } | |
2160 | ||
8352d8a4 CM |
2161 | static int add_disk(struct btrfs_root *root, char *name, int namelen) |
2162 | { | |
2163 | struct block_device *bdev; | |
2164 | struct btrfs_path *path; | |
2165 | struct super_block *sb = root->fs_info->sb; | |
2166 | struct btrfs_root *dev_root = root->fs_info->dev_root; | |
2167 | struct btrfs_trans_handle *trans; | |
2168 | struct btrfs_device_item *dev_item; | |
2169 | struct btrfs_key key; | |
2170 | u16 item_size; | |
2171 | u64 num_blocks; | |
2172 | u64 new_blocks; | |
b4100d64 | 2173 | u64 device_id; |
8352d8a4 | 2174 | int ret; |
b4100d64 | 2175 | |
8352d8a4 CM |
2176 | printk("adding disk %s\n", name); |
2177 | path = btrfs_alloc_path(); | |
2178 | if (!path) | |
2179 | return -ENOMEM; | |
2180 | num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super); | |
2181 | bdev = open_bdev_excl(name, O_RDWR, sb); | |
2182 | if (IS_ERR(bdev)) { | |
2183 | ret = PTR_ERR(bdev); | |
2184 | printk("open bdev excl failed ret %d\n", ret); | |
2185 | goto out_nolock; | |
2186 | } | |
2187 | set_blocksize(bdev, sb->s_blocksize); | |
2188 | new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
2189 | key.objectid = num_blocks; | |
2190 | key.offset = new_blocks; | |
2191 | key.flags = 0; | |
2192 | btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY); | |
2193 | ||
2194 | mutex_lock(&dev_root->fs_info->fs_mutex); | |
2195 | trans = btrfs_start_transaction(dev_root, 1); | |
2196 | item_size = sizeof(*dev_item) + namelen; | |
2197 | printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size); | |
2198 | ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size); | |
2199 | if (ret) { | |
2200 | printk("insert failed %d\n", ret); | |
2201 | close_bdev_excl(bdev); | |
2202 | if (ret > 0) | |
2203 | ret = -EEXIST; | |
2204 | goto out; | |
2205 | } | |
2206 | dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2207 | path->slots[0], struct btrfs_device_item); | |
2208 | btrfs_set_device_pathlen(dev_item, namelen); | |
2209 | memcpy(dev_item + 1, name, namelen); | |
b4100d64 CM |
2210 | |
2211 | device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1; | |
2212 | btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id); | |
2213 | btrfs_set_device_id(dev_item, device_id); | |
8352d8a4 CM |
2214 | mark_buffer_dirty(path->nodes[0]); |
2215 | ||
b4100d64 CM |
2216 | ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks, |
2217 | new_blocks); | |
8352d8a4 CM |
2218 | |
2219 | if (!ret) { | |
2220 | btrfs_set_super_total_blocks(root->fs_info->disk_super, | |
2221 | num_blocks + new_blocks); | |
2222 | i_size_write(root->fs_info->btree_inode, | |
2223 | (num_blocks + new_blocks) << | |
2224 | root->fs_info->btree_inode->i_blkbits); | |
2225 | } | |
2226 | ||
2227 | out: | |
2228 | ret = btrfs_commit_transaction(trans, dev_root); | |
2229 | BUG_ON(ret); | |
2230 | mutex_unlock(&root->fs_info->fs_mutex); | |
2231 | out_nolock: | |
2232 | btrfs_free_path(path); | |
2233 | ||
2234 | return ret; | |
2235 | } | |
2236 | ||
c5739bba CM |
2237 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
2238 | cmd, unsigned long arg) | |
2239 | { | |
2240 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2241 | struct btrfs_ioctl_vol_args vol_args; | |
8352d8a4 | 2242 | int ret = 0; |
7e38180e | 2243 | struct btrfs_dir_item *di; |
c5739bba | 2244 | int namelen; |
2619ba1f CM |
2245 | struct btrfs_path *path; |
2246 | u64 root_dirid; | |
c5739bba | 2247 | |
c5739bba CM |
2248 | switch (cmd) { |
2249 | case BTRFS_IOC_SNAP_CREATE: | |
2250 | if (copy_from_user(&vol_args, | |
2251 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2252 | sizeof(vol_args))) | |
2253 | return -EFAULT; | |
2254 | namelen = strlen(vol_args.name); | |
2255 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2256 | return -EINVAL; | |
2619ba1f CM |
2257 | path = btrfs_alloc_path(); |
2258 | if (!path) | |
2259 | return -ENOMEM; | |
2d13d8d0 | 2260 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
2619ba1f | 2261 | mutex_lock(&root->fs_info->fs_mutex); |
7e38180e | 2262 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
2619ba1f CM |
2263 | path, root_dirid, |
2264 | vol_args.name, namelen, 0); | |
2265 | mutex_unlock(&root->fs_info->fs_mutex); | |
2d13d8d0 | 2266 | btrfs_free_path(path); |
7e38180e | 2267 | if (di && !IS_ERR(di)) |
2619ba1f CM |
2268 | return -EEXIST; |
2269 | ||
2270 | if (root == root->fs_info->tree_root) | |
2271 | ret = create_subvol(root, vol_args.name, namelen); | |
2272 | else | |
2273 | ret = create_snapshot(root, vol_args.name, namelen); | |
c5739bba CM |
2274 | WARN_ON(ret); |
2275 | break; | |
8352d8a4 CM |
2276 | case BTRFS_IOC_ADD_DISK: |
2277 | if (copy_from_user(&vol_args, | |
2278 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2279 | sizeof(vol_args))) | |
2280 | return -EFAULT; | |
2281 | namelen = strlen(vol_args.name); | |
2282 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2283 | return -EINVAL; | |
2284 | vol_args.name[namelen] = '\0'; | |
2285 | ret = add_disk(root, vol_args.name, namelen); | |
2286 | break; | |
c5739bba CM |
2287 | default: |
2288 | return -ENOTTY; | |
2289 | } | |
8352d8a4 | 2290 | return ret; |
c5739bba CM |
2291 | } |
2292 | ||
2c90e5d6 CM |
2293 | static struct kmem_cache *btrfs_inode_cachep; |
2294 | struct kmem_cache *btrfs_trans_handle_cachep; | |
2295 | struct kmem_cache *btrfs_transaction_cachep; | |
2296 | struct kmem_cache *btrfs_bit_radix_cachep; | |
2297 | struct kmem_cache *btrfs_path_cachep; | |
2298 | ||
2299 | /* | |
2300 | * Called inside transaction, so use GFP_NOFS | |
2301 | */ | |
2302 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2303 | { | |
2304 | struct btrfs_inode *ei; | |
2305 | ||
2306 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2307 | if (!ei) | |
2308 | return NULL; | |
2c90e5d6 CM |
2309 | return &ei->vfs_inode; |
2310 | } | |
2311 | ||
2312 | static void btrfs_destroy_inode(struct inode *inode) | |
2313 | { | |
2c90e5d6 | 2314 | WARN_ON(!list_empty(&inode->i_dentry)); |
2c90e5d6 CM |
2315 | WARN_ON(inode->i_data.nrpages); |
2316 | ||
2c90e5d6 CM |
2317 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2318 | } | |
2319 | ||
2320 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2321 | unsigned long flags) | |
2322 | { | |
2323 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2324 | ||
2325 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
2326 | SLAB_CTOR_CONSTRUCTOR) { | |
2327 | inode_init_once(&ei->vfs_inode); | |
2328 | } | |
2329 | } | |
2330 | ||
2331 | static int init_inodecache(void) | |
2332 | { | |
2333 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
2334 | sizeof(struct btrfs_inode), | |
2335 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2336 | SLAB_MEM_SPREAD), | |
2337 | init_once, NULL); | |
2338 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
2339 | sizeof(struct btrfs_trans_handle), | |
2340 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2341 | SLAB_MEM_SPREAD), | |
2342 | NULL, NULL); | |
2343 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
2344 | sizeof(struct btrfs_transaction), | |
2345 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2346 | SLAB_MEM_SPREAD), | |
2347 | NULL, NULL); | |
2348 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
2349 | sizeof(struct btrfs_transaction), | |
2350 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2351 | SLAB_MEM_SPREAD), | |
2352 | NULL, NULL); | |
2353 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
2354 | 256, | |
2355 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2356 | SLAB_MEM_SPREAD | | |
2357 | SLAB_DESTROY_BY_RCU), | |
2358 | NULL, NULL); | |
2359 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
2360 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
2361 | return -ENOMEM; | |
2362 | return 0; | |
2363 | } | |
2364 | ||
2365 | static void destroy_inodecache(void) | |
2366 | { | |
2367 | kmem_cache_destroy(btrfs_inode_cachep); | |
2368 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2369 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2370 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2371 | kmem_cache_destroy(btrfs_path_cachep); | |
2372 | } | |
2373 | ||
2e635a27 CM |
2374 | static int btrfs_get_sb(struct file_system_type *fs_type, |
2375 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
2376 | { | |
2377 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
2378 | btrfs_fill_super, mnt); | |
2379 | } | |
2380 | ||
236454df CM |
2381 | |
2382 | static int btrfs_getattr(struct vfsmount *mnt, | |
2383 | struct dentry *dentry, struct kstat *stat) | |
2384 | { | |
2385 | struct inode *inode = dentry->d_inode; | |
2386 | generic_fillattr(inode, stat); | |
2387 | stat->blksize = 256 * 1024; | |
2388 | return 0; | |
2389 | } | |
2390 | ||
8fd17795 CM |
2391 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2392 | { | |
2393 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
2394 | struct btrfs_super_block *disk_super = root->fs_info->disk_super; | |
2395 | ||
2396 | buf->f_namelen = BTRFS_NAME_LEN; | |
2397 | buf->f_blocks = btrfs_super_total_blocks(disk_super); | |
2398 | buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super); | |
2399 | buf->f_bavail = buf->f_bfree; | |
2400 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2401 | buf->f_type = BTRFS_SUPER_MAGIC; | |
2402 | return 0; | |
2403 | } | |
b5133862 | 2404 | |
2e635a27 CM |
2405 | static struct file_system_type btrfs_fs_type = { |
2406 | .owner = THIS_MODULE, | |
2407 | .name = "btrfs", | |
2408 | .get_sb = btrfs_get_sb, | |
2409 | .kill_sb = kill_block_super, | |
2410 | .fs_flags = FS_REQUIRES_DEV, | |
2411 | }; | |
2412 | ||
e20d96d6 | 2413 | static struct super_operations btrfs_super_ops = { |
134e9731 | 2414 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
2415 | .put_super = btrfs_put_super, |
2416 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
2417 | .write_super = btrfs_write_super, |
2418 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 2419 | .write_inode = btrfs_write_inode, |
b5133862 | 2420 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
2421 | .alloc_inode = btrfs_alloc_inode, |
2422 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2423 | .statfs = btrfs_statfs, |
e20d96d6 CM |
2424 | }; |
2425 | ||
2426 | static struct inode_operations btrfs_dir_inode_operations = { | |
2427 | .lookup = btrfs_lookup, | |
d5719762 | 2428 | .create = btrfs_create, |
134e9731 | 2429 | .unlink = btrfs_unlink, |
f7922033 | 2430 | .mkdir = btrfs_mkdir, |
5f443fd2 | 2431 | .rmdir = btrfs_rmdir, |
e20d96d6 CM |
2432 | }; |
2433 | ||
d6e4a428 CM |
2434 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2435 | .lookup = btrfs_lookup, | |
2436 | }; | |
2437 | ||
e20d96d6 CM |
2438 | static struct file_operations btrfs_dir_file_operations = { |
2439 | .llseek = generic_file_llseek, | |
2440 | .read = generic_read_dir, | |
2441 | .readdir = btrfs_readdir, | |
c5739bba | 2442 | .ioctl = btrfs_ioctl, |
e20d96d6 CM |
2443 | }; |
2444 | ||
dee26a9f CM |
2445 | static struct address_space_operations btrfs_aops = { |
2446 | .readpage = btrfs_readpage, | |
dee26a9f CM |
2447 | .writepage = btrfs_writepage, |
2448 | .sync_page = block_sync_page, | |
2449 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 2450 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
2451 | }; |
2452 | ||
2453 | static struct inode_operations btrfs_file_inode_operations = { | |
f4b9aa8d | 2454 | .truncate = btrfs_truncate, |
236454df | 2455 | .getattr = btrfs_getattr, |
dee26a9f CM |
2456 | }; |
2457 | ||
2458 | static struct file_operations btrfs_file_operations = { | |
2459 | .llseek = generic_file_llseek, | |
2460 | .read = do_sync_read, | |
e8f05c45 CM |
2461 | .aio_read = btrfs_file_aio_read, |
2462 | .write = btrfs_file_write, | |
dee26a9f CM |
2463 | .mmap = generic_file_mmap, |
2464 | .open = generic_file_open, | |
c5739bba | 2465 | .ioctl = btrfs_ioctl, |
8fd17795 | 2466 | .fsync = btrfs_sync_file, |
dee26a9f | 2467 | }; |
e20d96d6 | 2468 | |
2e635a27 CM |
2469 | static int __init init_btrfs_fs(void) |
2470 | { | |
2c90e5d6 | 2471 | int err; |
2e635a27 | 2472 | printk("btrfs loaded!\n"); |
2c90e5d6 CM |
2473 | err = init_inodecache(); |
2474 | if (err) | |
2475 | return err; | |
d6e4a428 CM |
2476 | kset_set_kset_s(&btrfs_subsys, fs_subsys); |
2477 | err = subsystem_register(&btrfs_subsys); | |
2478 | if (err) | |
2479 | goto out; | |
2e635a27 | 2480 | return register_filesystem(&btrfs_fs_type); |
d6e4a428 CM |
2481 | out: |
2482 | destroy_inodecache(); | |
2483 | return err; | |
2e635a27 CM |
2484 | } |
2485 | ||
2486 | static void __exit exit_btrfs_fs(void) | |
2487 | { | |
2c90e5d6 | 2488 | destroy_inodecache(); |
2e635a27 | 2489 | unregister_filesystem(&btrfs_fs_type); |
d6e4a428 | 2490 | subsystem_unregister(&btrfs_subsys); |
2e635a27 CM |
2491 | printk("btrfs unloaded\n"); |
2492 | } | |
2493 | ||
2494 | module_init(init_btrfs_fs) | |
2495 | module_exit(exit_btrfs_fs) | |
2496 | ||
2497 | MODULE_LICENSE("GPL"); |