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" |
3a686375 | 20 | #include "print-tree.h" |
2e635a27 | 21 | |
c5739bba CM |
22 | struct btrfs_iget_args { |
23 | u64 ino; | |
24 | struct btrfs_root *root; | |
25 | }; | |
26 | ||
2e635a27 | 27 | #define BTRFS_SUPER_MAGIC 0x9123682E |
e20d96d6 CM |
28 | |
29 | static struct inode_operations btrfs_dir_inode_operations; | |
2b8d99a7 | 30 | static struct inode_operations btrfs_symlink_inode_operations; |
d6e4a428 | 31 | static struct inode_operations btrfs_dir_ro_inode_operations; |
e20d96d6 CM |
32 | static struct super_operations btrfs_super_ops; |
33 | static struct file_operations btrfs_dir_file_operations; | |
dee26a9f CM |
34 | static struct inode_operations btrfs_file_inode_operations; |
35 | static struct address_space_operations btrfs_aops; | |
2b8d99a7 | 36 | static struct address_space_operations btrfs_symlink_aops; |
dee26a9f | 37 | static struct file_operations btrfs_file_operations; |
e20d96d6 | 38 | |
1de037a4 CM |
39 | static int drop_extents(struct btrfs_trans_handle *trans, |
40 | struct btrfs_root *root, | |
41 | struct inode *inode, | |
42 | u64 start, u64 end, u64 *hint_block); | |
43 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
44 | struct buffer_head *result, int create); | |
45 | ||
e20d96d6 | 46 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 47 | { |
5caf2a00 | 48 | struct btrfs_path *path; |
e20d96d6 | 49 | struct btrfs_inode_item *inode_item; |
d6e4a428 CM |
50 | struct btrfs_root *root = BTRFS_I(inode)->root; |
51 | struct btrfs_key location; | |
31f3c99b CM |
52 | struct btrfs_block_group_cache *alloc_group; |
53 | u64 alloc_group_block; | |
e20d96d6 | 54 | int ret; |
f4b9aa8d | 55 | |
5caf2a00 CM |
56 | path = btrfs_alloc_path(); |
57 | BUG_ON(!path); | |
58 | btrfs_init_path(path); | |
f4b9aa8d CM |
59 | mutex_lock(&root->fs_info->fs_mutex); |
60 | ||
d6e4a428 CM |
61 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
62 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
e20d96d6 | 63 | if (ret) { |
7cfcc17e | 64 | btrfs_free_path(path); |
d6e4a428 | 65 | goto make_bad; |
e20d96d6 | 66 | } |
5caf2a00 CM |
67 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
68 | path->slots[0], | |
e20d96d6 | 69 | struct btrfs_inode_item); |
2e635a27 | 70 | |
e20d96d6 CM |
71 | inode->i_mode = btrfs_inode_mode(inode_item); |
72 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
73 | inode->i_uid = btrfs_inode_uid(inode_item); | |
74 | inode->i_gid = btrfs_inode_gid(inode_item); | |
75 | inode->i_size = btrfs_inode_size(inode_item); | |
76 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
77 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
78 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
79 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
80 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
81 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
82 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
83 | inode->i_generation = btrfs_inode_generation(inode_item); | |
31f3c99b CM |
84 | alloc_group_block = btrfs_inode_block_group(inode_item); |
85 | ret = radix_tree_gang_lookup(&root->fs_info->block_group_radix, | |
86 | (void **)&alloc_group, | |
87 | alloc_group_block, 1); | |
88 | BUG_ON(!ret); | |
89 | BTRFS_I(inode)->block_group = alloc_group; | |
5caf2a00 | 90 | |
5caf2a00 CM |
91 | btrfs_free_path(path); |
92 | inode_item = NULL; | |
93 | ||
f4b9aa8d | 94 | mutex_unlock(&root->fs_info->fs_mutex); |
1b05da2e | 95 | |
e20d96d6 CM |
96 | switch (inode->i_mode & S_IFMT) { |
97 | #if 0 | |
98 | default: | |
99 | init_special_inode(inode, inode->i_mode, | |
100 | btrfs_inode_rdev(inode_item)); | |
101 | break; | |
102 | #endif | |
103 | case S_IFREG: | |
dee26a9f CM |
104 | inode->i_mapping->a_ops = &btrfs_aops; |
105 | inode->i_fop = &btrfs_file_operations; | |
106 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
107 | break; |
108 | case S_IFDIR: | |
e20d96d6 | 109 | inode->i_fop = &btrfs_dir_file_operations; |
d6e4a428 CM |
110 | if (root == root->fs_info->tree_root) |
111 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
112 | else | |
113 | inode->i_op = &btrfs_dir_inode_operations; | |
e20d96d6 CM |
114 | break; |
115 | case S_IFLNK: | |
2b8d99a7 CM |
116 | inode->i_op = &btrfs_symlink_inode_operations; |
117 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
e20d96d6 | 118 | break; |
2e635a27 | 119 | } |
e20d96d6 | 120 | return; |
d6e4a428 CM |
121 | |
122 | make_bad: | |
123 | btrfs_release_path(root, path); | |
124 | btrfs_free_path(path); | |
125 | mutex_unlock(&root->fs_info->fs_mutex); | |
126 | make_bad_inode(inode); | |
2e635a27 CM |
127 | } |
128 | ||
f68cad0f CM |
129 | static void fill_inode_item(struct btrfs_inode_item *item, |
130 | struct inode *inode) | |
131 | { | |
132 | btrfs_set_inode_uid(item, inode->i_uid); | |
133 | btrfs_set_inode_gid(item, inode->i_gid); | |
134 | btrfs_set_inode_size(item, inode->i_size); | |
135 | btrfs_set_inode_mode(item, inode->i_mode); | |
136 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
137 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
138 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
139 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
140 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
141 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
142 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
143 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
144 | btrfs_set_inode_generation(item, inode->i_generation); | |
31f3c99b CM |
145 | btrfs_set_inode_block_group(item, |
146 | BTRFS_I(inode)->block_group->key.objectid); | |
f68cad0f CM |
147 | } |
148 | ||
f68cad0f CM |
149 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
150 | struct btrfs_root *root, | |
151 | struct inode *inode) | |
152 | { | |
153 | struct btrfs_inode_item *inode_item; | |
154 | struct btrfs_path *path; | |
155 | int ret; | |
156 | ||
157 | path = btrfs_alloc_path(); | |
158 | BUG_ON(!path); | |
159 | btrfs_init_path(path); | |
160 | ret = btrfs_lookup_inode(trans, root, path, | |
161 | &BTRFS_I(inode)->location, 1); | |
162 | if (ret) { | |
163 | if (ret > 0) | |
164 | ret = -ENOENT; | |
165 | goto failed; | |
166 | } | |
167 | ||
168 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
169 | path->slots[0], | |
170 | struct btrfs_inode_item); | |
171 | ||
172 | fill_inode_item(inode_item, inode); | |
173 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
174 | ret = 0; | |
175 | failed: | |
176 | btrfs_release_path(root, path); | |
177 | btrfs_free_path(path); | |
178 | return ret; | |
179 | } | |
180 | ||
181 | ||
5f443fd2 CM |
182 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
183 | struct btrfs_root *root, | |
184 | struct inode *dir, | |
185 | struct dentry *dentry) | |
134e9731 | 186 | { |
5caf2a00 | 187 | struct btrfs_path *path; |
134e9731 CM |
188 | const char *name = dentry->d_name.name; |
189 | int name_len = dentry->d_name.len; | |
7e38180e | 190 | int ret = 0; |
134e9731 CM |
191 | u64 objectid; |
192 | struct btrfs_dir_item *di; | |
193 | ||
5caf2a00 CM |
194 | path = btrfs_alloc_path(); |
195 | BUG_ON(!path); | |
196 | btrfs_init_path(path); | |
7e38180e | 197 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
134e9731 | 198 | name, name_len, -1); |
7e38180e CM |
199 | if (IS_ERR(di)) { |
200 | ret = PTR_ERR(di); | |
134e9731 | 201 | goto err; |
7e38180e CM |
202 | } |
203 | if (!di) { | |
134e9731 CM |
204 | ret = -ENOENT; |
205 | goto err; | |
206 | } | |
d6e4a428 | 207 | objectid = btrfs_disk_key_objectid(&di->location); |
7e38180e CM |
208 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
209 | BUG_ON(ret); | |
210 | btrfs_release_path(root, path); | |
134e9731 | 211 | |
7e38180e CM |
212 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
213 | objectid, name, name_len, -1); | |
214 | if (IS_ERR(di)) { | |
215 | ret = PTR_ERR(di); | |
216 | goto err; | |
217 | } | |
218 | if (!di) { | |
219 | ret = -ENOENT; | |
220 | goto err; | |
221 | } | |
222 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
5f26f772 CM |
223 | BUG_ON(ret); |
224 | ||
134e9731 CM |
225 | dentry->d_inode->i_ctime = dir->i_ctime; |
226 | err: | |
5caf2a00 | 227 | btrfs_free_path(path); |
f68cad0f | 228 | if (!ret) { |
5f26f772 | 229 | dir->i_size -= name_len * 2; |
f68cad0f CM |
230 | btrfs_update_inode(trans, root, dir); |
231 | drop_nlink(dentry->d_inode); | |
232 | btrfs_update_inode(trans, root, dentry->d_inode); | |
cd1bc465 | 233 | dir->i_sb->s_dirt = 1; |
d4dbff95 | 234 | } |
134e9731 CM |
235 | return ret; |
236 | } | |
237 | ||
5f443fd2 CM |
238 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
239 | { | |
240 | struct btrfs_root *root; | |
241 | struct btrfs_trans_handle *trans; | |
242 | int ret; | |
243 | ||
d6e4a428 | 244 | root = BTRFS_I(dir)->root; |
5f443fd2 CM |
245 | mutex_lock(&root->fs_info->fs_mutex); |
246 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 247 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
248 | ret = btrfs_unlink_trans(trans, root, dir, dentry); |
249 | btrfs_end_transaction(trans, root); | |
250 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 251 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
252 | return ret; |
253 | } | |
254 | ||
255 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
256 | { | |
257 | struct inode *inode = dentry->d_inode; | |
258 | int err; | |
259 | int ret; | |
d6e4a428 | 260 | struct btrfs_root *root = BTRFS_I(dir)->root; |
5caf2a00 | 261 | struct btrfs_path *path; |
5f443fd2 CM |
262 | struct btrfs_key key; |
263 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
264 | struct btrfs_key found_key; |
265 | int found_type; | |
5f443fd2 | 266 | struct btrfs_leaf *leaf; |
5f26f772 | 267 | char *goodnames = ".."; |
5f443fd2 | 268 | |
5caf2a00 CM |
269 | path = btrfs_alloc_path(); |
270 | BUG_ON(!path); | |
271 | btrfs_init_path(path); | |
5f443fd2 CM |
272 | mutex_lock(&root->fs_info->fs_mutex); |
273 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 274 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
275 | key.objectid = inode->i_ino; |
276 | key.offset = (u64)-1; | |
5f26f772 CM |
277 | key.flags = (u32)-1; |
278 | while(1) { | |
279 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
280 | if (ret < 0) { | |
281 | err = ret; | |
282 | goto out; | |
283 | } | |
284 | BUG_ON(ret == 0); | |
285 | if (path->slots[0] == 0) { | |
286 | err = -ENOENT; | |
287 | goto out; | |
288 | } | |
289 | path->slots[0]--; | |
290 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
291 | btrfs_disk_key_to_cpu(&found_key, | |
292 | &leaf->items[path->slots[0]].key); | |
293 | found_type = btrfs_key_type(&found_key); | |
294 | if (found_key.objectid != inode->i_ino) { | |
295 | err = -ENOENT; | |
296 | goto out; | |
297 | } | |
298 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
299 | found_type != BTRFS_DIR_INDEX_KEY) || | |
300 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
301 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
302 | err = -ENOTEMPTY; | |
303 | goto out; | |
304 | } | |
305 | ret = btrfs_del_item(trans, root, path); | |
306 | BUG_ON(ret); | |
5f443fd2 | 307 | |
5f26f772 CM |
308 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
309 | break; | |
310 | btrfs_release_path(root, path); | |
5f443fd2 | 311 | } |
5f26f772 | 312 | ret = 0; |
5caf2a00 | 313 | btrfs_release_path(root, path); |
5f443fd2 CM |
314 | |
315 | /* now the directory is empty */ | |
316 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
317 | if (!err) { | |
318 | inode->i_size = 0; | |
319 | } | |
320 | out: | |
7cfcc17e CM |
321 | btrfs_release_path(root, path); |
322 | btrfs_free_path(path); | |
5f443fd2 CM |
323 | mutex_unlock(&root->fs_info->fs_mutex); |
324 | ret = btrfs_end_transaction(trans, root); | |
35b7e476 | 325 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
326 | if (ret && !err) |
327 | err = ret; | |
328 | return err; | |
329 | } | |
330 | ||
134e9731 CM |
331 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
332 | struct btrfs_root *root, | |
333 | struct inode *inode) | |
334 | { | |
5caf2a00 | 335 | struct btrfs_path *path; |
134e9731 | 336 | int ret; |
5caf2a00 | 337 | |
134e9731 | 338 | clear_inode(inode); |
5caf2a00 CM |
339 | |
340 | path = btrfs_alloc_path(); | |
341 | BUG_ON(!path); | |
342 | btrfs_init_path(path); | |
d6e4a428 CM |
343 | ret = btrfs_lookup_inode(trans, root, path, |
344 | &BTRFS_I(inode)->location, -1); | |
134e9731 | 345 | BUG_ON(ret); |
5caf2a00 | 346 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 347 | BUG_ON(ret); |
5caf2a00 | 348 | btrfs_free_path(path); |
134e9731 CM |
349 | return ret; |
350 | } | |
351 | ||
de428b63 CM |
352 | static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path, |
353 | u64 objectid) | |
354 | { | |
355 | struct btrfs_node *node; | |
356 | int i; | |
357 | int nritems; | |
358 | u64 item_objectid; | |
359 | u64 blocknr; | |
360 | int slot; | |
361 | int ret; | |
362 | ||
363 | if (!path->nodes[1]) | |
364 | return; | |
365 | node = btrfs_buffer_node(path->nodes[1]); | |
366 | slot = path->slots[1]; | |
367 | if (slot == 0) | |
368 | return; | |
369 | nritems = btrfs_header_nritems(&node->header); | |
370 | for (i = slot - 1; i >= 0; i--) { | |
371 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); | |
372 | if (item_objectid != objectid) | |
373 | break; | |
374 | blocknr = btrfs_node_blockptr(node, i); | |
375 | ret = readahead_tree_block(root, blocknr); | |
376 | if (ret) | |
377 | break; | |
378 | } | |
379 | } | |
380 | ||
f4b9aa8d CM |
381 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
382 | struct btrfs_root *root, | |
383 | struct inode *inode) | |
384 | { | |
385 | int ret; | |
5caf2a00 | 386 | struct btrfs_path *path; |
f4b9aa8d CM |
387 | struct btrfs_key key; |
388 | struct btrfs_disk_key *found_key; | |
e06afa83 | 389 | u32 found_type; |
f4b9aa8d | 390 | struct btrfs_leaf *leaf; |
1de037a4 | 391 | struct btrfs_file_extent_item *fi; |
f254e52c CM |
392 | u64 extent_start = 0; |
393 | u64 extent_num_blocks = 0; | |
1de037a4 | 394 | u64 item_end = 0; |
f254e52c | 395 | int found_extent; |
1de037a4 | 396 | int del_item; |
f4b9aa8d | 397 | |
5caf2a00 CM |
398 | path = btrfs_alloc_path(); |
399 | BUG_ON(!path); | |
f4b9aa8d CM |
400 | /* FIXME, add redo link to tree so we don't leak on crash */ |
401 | key.objectid = inode->i_ino; | |
402 | key.offset = (u64)-1; | |
e06afa83 | 403 | key.flags = (u32)-1; |
f4b9aa8d | 404 | while(1) { |
5caf2a00 | 405 | btrfs_init_path(path); |
1de037a4 | 406 | fi = NULL; |
5caf2a00 | 407 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
f4b9aa8d | 408 | if (ret < 0) { |
f4b9aa8d CM |
409 | goto error; |
410 | } | |
411 | if (ret > 0) { | |
5caf2a00 CM |
412 | BUG_ON(path->slots[0] == 0); |
413 | path->slots[0]--; | |
f4b9aa8d | 414 | } |
de428b63 | 415 | reada_truncate(root, path, inode->i_ino); |
5caf2a00 CM |
416 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
417 | found_key = &leaf->items[path->slots[0]].key; | |
e06afa83 | 418 | found_type = btrfs_disk_key_type(found_key); |
f4b9aa8d CM |
419 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
420 | break; | |
e06afa83 CM |
421 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
422 | found_type != BTRFS_DIR_ITEM_KEY && | |
423 | found_type != BTRFS_DIR_INDEX_KEY && | |
424 | found_type != BTRFS_EXTENT_DATA_KEY) | |
f4b9aa8d | 425 | break; |
1de037a4 CM |
426 | item_end = btrfs_disk_key_offset(found_key); |
427 | if (found_type == BTRFS_EXTENT_DATA_KEY) { | |
5caf2a00 CM |
428 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
429 | path->slots[0], | |
f254e52c | 430 | struct btrfs_file_extent_item); |
236454df CM |
431 | if (btrfs_file_extent_type(fi) != |
432 | BTRFS_FILE_EXTENT_INLINE) { | |
1de037a4 CM |
433 | item_end += btrfs_file_extent_num_blocks(fi) << |
434 | inode->i_blkbits; | |
435 | } | |
436 | } | |
437 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
438 | ret = btrfs_csum_truncate(trans, root, path, | |
439 | inode->i_size); | |
440 | BUG_ON(ret); | |
441 | } | |
442 | if (item_end < inode->i_size) { | |
443 | if (found_type) { | |
444 | btrfs_set_key_type(&key, found_type - 1); | |
445 | continue; | |
446 | } | |
447 | break; | |
448 | } | |
449 | if (btrfs_disk_key_offset(found_key) >= inode->i_size) | |
450 | del_item = 1; | |
451 | else | |
452 | del_item = 0; | |
453 | found_extent = 0; | |
454 | ||
455 | if (found_type == BTRFS_EXTENT_DATA_KEY && | |
456 | btrfs_file_extent_type(fi) != | |
457 | BTRFS_FILE_EXTENT_INLINE) { | |
458 | u64 num_dec; | |
459 | if (!del_item) { | |
460 | u64 orig_num_blocks = | |
461 | btrfs_file_extent_num_blocks(fi); | |
462 | extent_num_blocks = inode->i_size - | |
463 | btrfs_disk_key_offset(found_key) + | |
464 | root->blocksize - 1; | |
465 | extent_num_blocks >>= inode->i_blkbits; | |
466 | btrfs_set_file_extent_num_blocks(fi, | |
467 | extent_num_blocks); | |
468 | inode->i_blocks -= (orig_num_blocks - | |
469 | extent_num_blocks) << 3; | |
470 | mark_buffer_dirty(path->nodes[0]); | |
471 | } else { | |
236454df CM |
472 | extent_start = |
473 | btrfs_file_extent_disk_blocknr(fi); | |
474 | extent_num_blocks = | |
475 | btrfs_file_extent_disk_num_blocks(fi); | |
476 | /* FIXME blocksize != 4096 */ | |
3a686375 CM |
477 | num_dec = btrfs_file_extent_num_blocks(fi) << 3; |
478 | if (extent_start != 0) { | |
479 | found_extent = 1; | |
480 | inode->i_blocks -= num_dec; | |
481 | } | |
236454df | 482 | } |
f254e52c | 483 | } |
1de037a4 CM |
484 | if (del_item) { |
485 | ret = btrfs_del_item(trans, root, path); | |
486 | BUG_ON(ret); | |
487 | } else { | |
488 | break; | |
489 | } | |
5caf2a00 | 490 | btrfs_release_path(root, path); |
f254e52c CM |
491 | if (found_extent) { |
492 | ret = btrfs_free_extent(trans, root, extent_start, | |
493 | extent_num_blocks, 0); | |
494 | BUG_ON(ret); | |
495 | } | |
f4b9aa8d | 496 | } |
f4b9aa8d CM |
497 | ret = 0; |
498 | error: | |
5caf2a00 CM |
499 | btrfs_release_path(root, path); |
500 | btrfs_free_path(path); | |
cd1bc465 | 501 | inode->i_sb->s_dirt = 1; |
f4b9aa8d CM |
502 | return ret; |
503 | } | |
504 | ||
1de037a4 CM |
505 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) |
506 | { | |
507 | struct inode *inode = mapping->host; | |
508 | unsigned blocksize = 1 << inode->i_blkbits; | |
509 | pgoff_t index = from >> PAGE_CACHE_SHIFT; | |
510 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
511 | struct page *page; | |
512 | char *kaddr; | |
513 | int ret = 0; | |
514 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
515 | u64 alloc_hint; | |
516 | struct btrfs_key ins; | |
517 | struct btrfs_trans_handle *trans; | |
518 | ||
519 | if ((offset & (blocksize - 1)) == 0) | |
520 | goto out; | |
521 | ||
522 | ret = -ENOMEM; | |
523 | page = grab_cache_page(mapping, index); | |
524 | if (!page) | |
525 | goto out; | |
526 | ||
527 | if (!PageUptodate(page)) { | |
528 | ret = mpage_readpage(page, btrfs_get_block); | |
529 | lock_page(page); | |
530 | if (!PageUptodate(page)) { | |
531 | ret = -EIO; | |
532 | goto out; | |
533 | } | |
534 | } | |
535 | mutex_lock(&root->fs_info->fs_mutex); | |
536 | trans = btrfs_start_transaction(root, 1); | |
537 | btrfs_set_trans_block_group(trans, inode); | |
538 | ||
539 | ret = drop_extents(trans, root, inode, page->index << PAGE_CACHE_SHIFT, | |
540 | (page->index + 1) << PAGE_CACHE_SHIFT, &alloc_hint); | |
541 | BUG_ON(ret); | |
542 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, 1, | |
543 | alloc_hint, (u64)-1, &ins, 1); | |
544 | BUG_ON(ret); | |
545 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
546 | page->index << PAGE_CACHE_SHIFT, | |
547 | ins.objectid, 1, 1); | |
548 | BUG_ON(ret); | |
549 | SetPageChecked(page); | |
550 | kaddr = kmap(page); | |
551 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
552 | flush_dcache_page(page); | |
553 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
554 | page->index << PAGE_CACHE_SHIFT, | |
555 | kaddr, PAGE_CACHE_SIZE); | |
556 | kunmap(page); | |
557 | btrfs_end_transaction(trans, root); | |
558 | mutex_unlock(&root->fs_info->fs_mutex); | |
559 | ||
560 | set_page_dirty(page); | |
561 | unlock_page(page); | |
562 | page_cache_release(page); | |
563 | out: | |
564 | return ret; | |
565 | } | |
566 | ||
3a686375 CM |
567 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
568 | { | |
569 | struct inode *inode = dentry->d_inode; | |
570 | int err; | |
571 | ||
572 | err = inode_change_ok(inode, attr); | |
573 | if (err) | |
574 | return err; | |
575 | ||
576 | if (S_ISREG(inode->i_mode) && | |
577 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
578 | struct btrfs_trans_handle *trans; | |
579 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
580 | u64 mask = root->blocksize - 1; | |
581 | u64 pos = (inode->i_size + mask) & ~mask; | |
582 | u64 hole_size; | |
583 | ||
1de037a4 | 584 | if (attr->ia_size <= pos) |
3a686375 | 585 | goto out; |
1de037a4 CM |
586 | |
587 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
588 | ||
3a686375 CM |
589 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
590 | hole_size >>= inode->i_blkbits; | |
591 | ||
592 | mutex_lock(&root->fs_info->fs_mutex); | |
593 | trans = btrfs_start_transaction(root, 1); | |
594 | btrfs_set_trans_block_group(trans, inode); | |
595 | err = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
596 | pos, 0, 0, hole_size); | |
597 | BUG_ON(err); | |
598 | btrfs_end_transaction(trans, root); | |
599 | mutex_unlock(&root->fs_info->fs_mutex); | |
600 | } | |
1de037a4 | 601 | out: |
3a686375 CM |
602 | err = inode_setattr(inode, attr); |
603 | ||
3a686375 CM |
604 | return err; |
605 | } | |
134e9731 CM |
606 | static void btrfs_delete_inode(struct inode *inode) |
607 | { | |
608 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 609 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
610 | int ret; |
611 | ||
134e9731 CM |
612 | truncate_inode_pages(&inode->i_data, 0); |
613 | if (is_bad_inode(inode)) { | |
614 | goto no_delete; | |
615 | } | |
616 | inode->i_size = 0; | |
134e9731 CM |
617 | mutex_lock(&root->fs_info->fs_mutex); |
618 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 619 | btrfs_set_trans_block_group(trans, inode); |
e06afa83 CM |
620 | ret = btrfs_truncate_in_trans(trans, root, inode); |
621 | BUG_ON(ret); | |
134e9731 CM |
622 | btrfs_free_inode(trans, root, inode); |
623 | btrfs_end_transaction(trans, root); | |
624 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 625 | btrfs_btree_balance_dirty(root); |
134e9731 CM |
626 | return; |
627 | no_delete: | |
628 | clear_inode(inode); | |
629 | } | |
630 | ||
e20d96d6 | 631 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
d6e4a428 | 632 | struct btrfs_key *location) |
e20d96d6 CM |
633 | { |
634 | const char *name = dentry->d_name.name; | |
635 | int namelen = dentry->d_name.len; | |
636 | struct btrfs_dir_item *di; | |
5caf2a00 | 637 | struct btrfs_path *path; |
d6e4a428 | 638 | struct btrfs_root *root = BTRFS_I(dir)->root; |
e20d96d6 CM |
639 | int ret; |
640 | ||
5caf2a00 CM |
641 | path = btrfs_alloc_path(); |
642 | BUG_ON(!path); | |
643 | btrfs_init_path(path); | |
7e38180e | 644 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
e20d96d6 | 645 | namelen, 0); |
7e38180e | 646 | if (!di || IS_ERR(di)) { |
d6e4a428 | 647 | location->objectid = 0; |
2c90e5d6 | 648 | ret = 0; |
e20d96d6 CM |
649 | goto out; |
650 | } | |
d6e4a428 | 651 | btrfs_disk_key_to_cpu(location, &di->location); |
e20d96d6 | 652 | out: |
5caf2a00 CM |
653 | btrfs_release_path(root, path); |
654 | btrfs_free_path(path); | |
e20d96d6 CM |
655 | return ret; |
656 | } | |
657 | ||
35b7e476 | 658 | static int fixup_tree_root_location(struct btrfs_root *root, |
d6e4a428 CM |
659 | struct btrfs_key *location, |
660 | struct btrfs_root **sub_root) | |
661 | { | |
662 | struct btrfs_path *path; | |
663 | struct btrfs_root_item *ri; | |
d6e4a428 CM |
664 | |
665 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
666 | return 0; | |
667 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
668 | return 0; | |
669 | ||
670 | path = btrfs_alloc_path(); | |
671 | BUG_ON(!path); | |
672 | mutex_lock(&root->fs_info->fs_mutex); | |
673 | ||
0f7d52f4 CM |
674 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
675 | if (IS_ERR(*sub_root)) | |
676 | return PTR_ERR(*sub_root); | |
677 | ||
678 | ri = &(*sub_root)->root_item; | |
d6e4a428 CM |
679 | location->objectid = btrfs_root_dirid(ri); |
680 | location->flags = 0; | |
681 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
682 | location->offset = 0; | |
0f7d52f4 | 683 | |
d6e4a428 CM |
684 | btrfs_free_path(path); |
685 | mutex_unlock(&root->fs_info->fs_mutex); | |
0f7d52f4 | 686 | return 0; |
d6e4a428 CM |
687 | } |
688 | ||
35b7e476 | 689 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
c5739bba CM |
690 | { |
691 | struct btrfs_iget_args *args = p; | |
692 | inode->i_ino = args->ino; | |
693 | BTRFS_I(inode)->root = args->root; | |
694 | return 0; | |
695 | } | |
696 | ||
35b7e476 | 697 | static int btrfs_find_actor(struct inode *inode, void *opaque) |
c5739bba CM |
698 | { |
699 | struct btrfs_iget_args *args = opaque; | |
700 | return (args->ino == inode->i_ino && | |
701 | args->root == BTRFS_I(inode)->root); | |
702 | } | |
703 | ||
35b7e476 CM |
704 | static struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
705 | struct btrfs_root *root) | |
c5739bba CM |
706 | { |
707 | struct inode *inode; | |
708 | struct btrfs_iget_args args; | |
709 | args.ino = objectid; | |
710 | args.root = root; | |
711 | ||
712 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
713 | btrfs_init_locked_inode, | |
714 | (void *)&args); | |
715 | return inode; | |
716 | } | |
d6e4a428 | 717 | |
e20d96d6 CM |
718 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
719 | struct nameidata *nd) | |
720 | { | |
721 | struct inode * inode; | |
d6e4a428 CM |
722 | struct btrfs_inode *bi = BTRFS_I(dir); |
723 | struct btrfs_root *root = bi->root; | |
724 | struct btrfs_root *sub_root = root; | |
725 | struct btrfs_key location; | |
e20d96d6 CM |
726 | int ret; |
727 | ||
728 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
729 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 730 | mutex_lock(&root->fs_info->fs_mutex); |
d6e4a428 | 731 | ret = btrfs_inode_by_name(dir, dentry, &location); |
22b0ebda | 732 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
733 | if (ret < 0) |
734 | return ERR_PTR(ret); | |
735 | inode = NULL; | |
d6e4a428 CM |
736 | if (location.objectid) { |
737 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
738 | if (ret < 0) | |
739 | return ERR_PTR(ret); | |
740 | if (ret > 0) | |
741 | return ERR_PTR(-ENOENT); | |
c5739bba CM |
742 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
743 | sub_root); | |
e20d96d6 CM |
744 | if (!inode) |
745 | return ERR_PTR(-EACCES); | |
d6e4a428 | 746 | if (inode->i_state & I_NEW) { |
0f7d52f4 | 747 | if (sub_root != root) { |
c5739bba | 748 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
0f7d52f4 CM |
749 | igrab(inode); |
750 | sub_root->inode = inode; | |
751 | } | |
d6e4a428 CM |
752 | BTRFS_I(inode)->root = sub_root; |
753 | memcpy(&BTRFS_I(inode)->location, &location, | |
754 | sizeof(location)); | |
755 | btrfs_read_locked_inode(inode); | |
756 | unlock_new_inode(inode); | |
757 | } | |
e20d96d6 CM |
758 | } |
759 | return d_splice_alias(inode, dentry); | |
760 | } | |
761 | ||
de428b63 CM |
762 | static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path, |
763 | u64 objectid) | |
090d1875 CM |
764 | { |
765 | struct btrfs_node *node; | |
766 | int i; | |
de428b63 | 767 | u32 nritems; |
090d1875 CM |
768 | u64 item_objectid; |
769 | u64 blocknr; | |
770 | int slot; | |
de428b63 | 771 | int ret; |
090d1875 CM |
772 | |
773 | if (!path->nodes[1]) | |
774 | return; | |
775 | node = btrfs_buffer_node(path->nodes[1]); | |
776 | slot = path->slots[1]; | |
090d1875 | 777 | nritems = btrfs_header_nritems(&node->header); |
de428b63 | 778 | for (i = slot + 1; i < nritems; i++) { |
090d1875 CM |
779 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); |
780 | if (item_objectid != objectid) | |
781 | break; | |
782 | blocknr = btrfs_node_blockptr(node, i); | |
de428b63 CM |
783 | ret = readahead_tree_block(root, blocknr); |
784 | if (ret) | |
785 | break; | |
090d1875 CM |
786 | } |
787 | } | |
788 | ||
e20d96d6 CM |
789 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
790 | { | |
791 | struct inode *inode = filp->f_path.dentry->d_inode; | |
d6e4a428 | 792 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e20d96d6 CM |
793 | struct btrfs_item *item; |
794 | struct btrfs_dir_item *di; | |
795 | struct btrfs_key key; | |
5caf2a00 | 796 | struct btrfs_path *path; |
e20d96d6 CM |
797 | int ret; |
798 | u32 nritems; | |
799 | struct btrfs_leaf *leaf; | |
800 | int slot; | |
801 | int advance; | |
802 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 803 | int over = 0; |
7e38180e CM |
804 | u32 di_cur; |
805 | u32 di_total; | |
806 | u32 di_len; | |
807 | int key_type = BTRFS_DIR_INDEX_KEY; | |
d6e4a428 CM |
808 | |
809 | /* FIXME, use a real flag for deciding about the key type */ | |
810 | if (root->fs_info->tree_root == root) | |
811 | key_type = BTRFS_DIR_ITEM_KEY; | |
22b0ebda | 812 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 813 | key.objectid = inode->i_ino; |
e20d96d6 | 814 | key.flags = 0; |
d6e4a428 | 815 | btrfs_set_key_type(&key, key_type); |
e20d96d6 | 816 | key.offset = filp->f_pos; |
5caf2a00 CM |
817 | path = btrfs_alloc_path(); |
818 | btrfs_init_path(path); | |
819 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1b05da2e | 820 | if (ret < 0) |
e20d96d6 | 821 | goto err; |
7f5c1516 | 822 | advance = 0; |
de428b63 | 823 | reada_leaves(root, path, inode->i_ino); |
e20d96d6 | 824 | while(1) { |
5caf2a00 | 825 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 826 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 827 | slot = path->slots[0]; |
dee26a9f CM |
828 | if (advance || slot >= nritems) { |
829 | if (slot >= nritems -1) { | |
de428b63 | 830 | reada_leaves(root, path, inode->i_ino); |
5caf2a00 | 831 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
832 | if (ret) |
833 | break; | |
5caf2a00 | 834 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 835 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 836 | slot = path->slots[0]; |
e20d96d6 CM |
837 | } else { |
838 | slot++; | |
5caf2a00 | 839 | path->slots[0]++; |
e20d96d6 CM |
840 | } |
841 | } | |
842 | advance = 1; | |
843 | item = leaf->items + slot; | |
e20d96d6 CM |
844 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
845 | break; | |
d6e4a428 | 846 | if (btrfs_disk_key_type(&item->key) != key_type) |
a429e513 | 847 | break; |
7f5c1516 CM |
848 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
849 | continue; | |
7fcde0e3 | 850 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
dee26a9f | 851 | advance = 1; |
e20d96d6 | 852 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
7e38180e CM |
853 | di_cur = 0; |
854 | di_total = btrfs_item_size(leaf->items + slot); | |
855 | while(di_cur < di_total) { | |
856 | over = filldir(dirent, (const char *)(di + 1), | |
857 | btrfs_dir_name_len(di), | |
858 | btrfs_disk_key_offset(&item->key), | |
859 | btrfs_disk_key_objectid(&di->location), | |
860 | d_type); | |
861 | if (over) | |
862 | goto nopos; | |
863 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
864 | di_cur += di_len; | |
865 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
866 | } | |
e20d96d6 | 867 | } |
7fcde0e3 CM |
868 | filp->f_pos++; |
869 | nopos: | |
e20d96d6 CM |
870 | ret = 0; |
871 | err: | |
5caf2a00 CM |
872 | btrfs_release_path(root, path); |
873 | btrfs_free_path(path); | |
22b0ebda | 874 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
875 | return ret; |
876 | } | |
877 | ||
878 | static void btrfs_put_super (struct super_block * sb) | |
879 | { | |
880 | struct btrfs_root *root = btrfs_sb(sb); | |
881 | int ret; | |
882 | ||
883 | ret = close_ctree(root); | |
884 | if (ret) { | |
885 | printk("close ctree returns %d\n", ret); | |
886 | } | |
887 | sb->s_fs_info = NULL; | |
888 | } | |
2e635a27 CM |
889 | |
890 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
891 | { | |
892 | struct inode * inode; | |
e20d96d6 CM |
893 | struct dentry * root_dentry; |
894 | struct btrfs_super_block *disk_super; | |
0f7d52f4 | 895 | struct btrfs_root *tree_root; |
d6e4a428 | 896 | struct btrfs_inode *bi; |
2e635a27 CM |
897 | |
898 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 899 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 900 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 901 | sb->s_time_gran = 1; |
e20d96d6 | 902 | |
0f7d52f4 | 903 | tree_root = open_ctree(sb); |
d98237b3 | 904 | |
0f7d52f4 | 905 | if (!tree_root) { |
e20d96d6 CM |
906 | printk("btrfs: open_ctree failed\n"); |
907 | return -EIO; | |
908 | } | |
0f7d52f4 CM |
909 | sb->s_fs_info = tree_root; |
910 | disk_super = tree_root->fs_info->disk_super; | |
e20d96d6 CM |
911 | printk("read in super total blocks %Lu root %Lu\n", |
912 | btrfs_super_total_blocks(disk_super), | |
913 | btrfs_super_root_dir(disk_super)); | |
914 | ||
c5739bba CM |
915 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
916 | tree_root); | |
d6e4a428 CM |
917 | bi = BTRFS_I(inode); |
918 | bi->location.objectid = inode->i_ino; | |
919 | bi->location.offset = 0; | |
920 | bi->location.flags = 0; | |
0f7d52f4 | 921 | bi->root = tree_root; |
d6e4a428 CM |
922 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
923 | ||
2e635a27 CM |
924 | if (!inode) |
925 | return -ENOMEM; | |
e20d96d6 CM |
926 | if (inode->i_state & I_NEW) { |
927 | btrfs_read_locked_inode(inode); | |
928 | unlock_new_inode(inode); | |
929 | } | |
2e635a27 | 930 | |
e20d96d6 CM |
931 | root_dentry = d_alloc_root(inode); |
932 | if (!root_dentry) { | |
2e635a27 CM |
933 | iput(inode); |
934 | return -ENOMEM; | |
935 | } | |
e20d96d6 CM |
936 | sb->s_root = root_dentry; |
937 | ||
2e635a27 CM |
938 | return 0; |
939 | } | |
940 | ||
4730a4bc CM |
941 | static int btrfs_write_inode(struct inode *inode, int wait) |
942 | { | |
d6e4a428 | 943 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4730a4bc | 944 | struct btrfs_trans_handle *trans; |
b5133862 CM |
945 | int ret = 0; |
946 | ||
947 | if (wait) { | |
948 | mutex_lock(&root->fs_info->fs_mutex); | |
949 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 950 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
951 | ret = btrfs_commit_transaction(trans, root); |
952 | mutex_unlock(&root->fs_info->fs_mutex); | |
953 | } | |
954 | return ret; | |
955 | } | |
956 | ||
957 | static void btrfs_dirty_inode(struct inode *inode) | |
958 | { | |
959 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
960 | struct btrfs_trans_handle *trans; | |
4730a4bc CM |
961 | |
962 | mutex_lock(&root->fs_info->fs_mutex); | |
963 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 964 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
965 | btrfs_update_inode(trans, root, inode); |
966 | btrfs_end_transaction(trans, root); | |
4730a4bc | 967 | mutex_unlock(&root->fs_info->fs_mutex); |
35b7e476 | 968 | btrfs_btree_balance_dirty(root); |
4730a4bc CM |
969 | } |
970 | ||
d5719762 | 971 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2619ba1f | 972 | struct btrfs_root *root, |
31f3c99b CM |
973 | u64 objectid, |
974 | struct btrfs_block_group_cache *group, | |
975 | int mode) | |
d5719762 CM |
976 | { |
977 | struct inode *inode; | |
978 | struct btrfs_inode_item inode_item; | |
1b05da2e | 979 | struct btrfs_key *location; |
d5719762 | 980 | int ret; |
de428b63 | 981 | int owner; |
d5719762 | 982 | |
2619ba1f | 983 | inode = new_inode(root->fs_info->sb); |
d5719762 CM |
984 | if (!inode) |
985 | return ERR_PTR(-ENOMEM); | |
986 | ||
2619ba1f | 987 | BTRFS_I(inode)->root = root; |
de428b63 CM |
988 | if (mode & S_IFDIR) |
989 | owner = 0; | |
990 | else | |
991 | owner = 1; | |
992 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
31f3c99b | 993 | BTRFS_I(inode)->block_group = group; |
d5719762 CM |
994 | |
995 | inode->i_uid = current->fsuid; | |
996 | inode->i_gid = current->fsgid; | |
997 | inode->i_mode = mode; | |
998 | inode->i_ino = objectid; | |
999 | inode->i_blocks = 0; | |
c5739bba | 1000 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
d5719762 | 1001 | fill_inode_item(&inode_item, inode); |
1b05da2e CM |
1002 | location = &BTRFS_I(inode)->location; |
1003 | location->objectid = objectid; | |
1004 | location->flags = 0; | |
1005 | location->offset = 0; | |
1006 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
d5719762 CM |
1007 | |
1008 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
1009 | BUG_ON(ret); | |
1010 | ||
1011 | insert_inode_hash(inode); | |
d5719762 CM |
1012 | return inode; |
1013 | } | |
1014 | ||
1015 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1016 | struct dentry *dentry, struct inode *inode) | |
1017 | { | |
1018 | int ret; | |
d6e4a428 CM |
1019 | struct btrfs_key key; |
1020 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
1021 | key.objectid = inode->i_ino; | |
1022 | key.flags = 0; | |
1023 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1024 | key.offset = 0; | |
1025 | ||
1026 | ret = btrfs_insert_dir_item(trans, root, | |
d5719762 CM |
1027 | dentry->d_name.name, dentry->d_name.len, |
1028 | dentry->d_parent->d_inode->i_ino, | |
d6e4a428 | 1029 | &key, 0); |
4730a4bc | 1030 | if (ret == 0) { |
5f26f772 | 1031 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
d6e4a428 | 1032 | ret = btrfs_update_inode(trans, root, |
4730a4bc CM |
1033 | dentry->d_parent->d_inode); |
1034 | } | |
d5719762 CM |
1035 | return ret; |
1036 | } | |
1037 | ||
1038 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1039 | struct dentry *dentry, struct inode *inode) | |
1040 | { | |
1041 | int err = btrfs_add_link(trans, dentry, inode); | |
1042 | if (!err) { | |
1043 | d_instantiate(dentry, inode); | |
1044 | return 0; | |
1045 | } | |
2c90e5d6 CM |
1046 | if (err > 0) |
1047 | err = -EEXIST; | |
d5719762 CM |
1048 | return err; |
1049 | } | |
1050 | ||
1051 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
1052 | int mode, struct nameidata *nd) | |
1053 | { | |
1054 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 1055 | struct btrfs_root *root = BTRFS_I(dir)->root; |
d5719762 CM |
1056 | struct inode *inode; |
1057 | int err; | |
134e9731 | 1058 | int drop_inode = 0; |
2619ba1f | 1059 | u64 objectid; |
d5719762 | 1060 | |
d561c025 | 1061 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 | 1062 | trans = btrfs_start_transaction(root, 1); |
31f3c99b | 1063 | btrfs_set_trans_block_group(trans, dir); |
2619ba1f CM |
1064 | |
1065 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1066 | if (err) { | |
1067 | err = -ENOSPC; | |
1068 | goto out_unlock; | |
1069 | } | |
1070 | ||
31f3c99b CM |
1071 | inode = btrfs_new_inode(trans, root, objectid, |
1072 | BTRFS_I(dir)->block_group, mode); | |
d5719762 CM |
1073 | err = PTR_ERR(inode); |
1074 | if (IS_ERR(inode)) | |
d561c025 | 1075 | goto out_unlock; |
31f3c99b CM |
1076 | |
1077 | btrfs_set_trans_block_group(trans, inode); | |
d5719762 | 1078 | err = btrfs_add_nondir(trans, dentry, inode); |
134e9731 CM |
1079 | if (err) |
1080 | drop_inode = 1; | |
dee26a9f CM |
1081 | else { |
1082 | inode->i_mapping->a_ops = &btrfs_aops; | |
1083 | inode->i_fop = &btrfs_file_operations; | |
1084 | inode->i_op = &btrfs_file_inode_operations; | |
1085 | } | |
d5719762 | 1086 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
1087 | btrfs_update_inode_block_group(trans, inode); |
1088 | btrfs_update_inode_block_group(trans, dir); | |
d561c025 | 1089 | out_unlock: |
22b0ebda | 1090 | btrfs_end_transaction(trans, root); |
d561c025 | 1091 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 1092 | |
134e9731 CM |
1093 | if (drop_inode) { |
1094 | inode_dec_link_count(inode); | |
1095 | iput(inode); | |
1096 | } | |
35b7e476 | 1097 | btrfs_btree_balance_dirty(root); |
d5719762 CM |
1098 | return err; |
1099 | } | |
1100 | ||
2b8d99a7 CM |
1101 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, |
1102 | struct dentry *dentry) | |
1103 | { | |
1104 | struct btrfs_trans_handle *trans; | |
1105 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1106 | struct inode *inode = old_dentry->d_inode; | |
1107 | int err; | |
1108 | int drop_inode = 0; | |
1109 | ||
1110 | if (inode->i_nlink == 0) | |
1111 | return -ENOENT; | |
1112 | ||
1113 | inc_nlink(inode); | |
1114 | mutex_lock(&root->fs_info->fs_mutex); | |
1115 | trans = btrfs_start_transaction(root, 1); | |
1116 | btrfs_set_trans_block_group(trans, dir); | |
1117 | atomic_inc(&inode->i_count); | |
1118 | err = btrfs_add_nondir(trans, dentry, inode); | |
1119 | if (err) | |
1120 | drop_inode = 1; | |
1121 | dir->i_sb->s_dirt = 1; | |
1122 | btrfs_update_inode_block_group(trans, dir); | |
1123 | btrfs_update_inode(trans, root, inode); | |
1124 | ||
1125 | btrfs_end_transaction(trans, root); | |
1126 | mutex_unlock(&root->fs_info->fs_mutex); | |
1127 | ||
1128 | if (drop_inode) { | |
1129 | inode_dec_link_count(inode); | |
1130 | iput(inode); | |
1131 | } | |
1132 | btrfs_btree_balance_dirty(root); | |
1133 | return err; | |
1134 | } | |
1135 | ||
f7922033 | 1136 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
2619ba1f CM |
1137 | struct btrfs_root *root, |
1138 | u64 objectid, u64 dirid) | |
f7922033 | 1139 | { |
f7922033 CM |
1140 | int ret; |
1141 | char buf[2]; | |
d6e4a428 CM |
1142 | struct btrfs_key key; |
1143 | ||
f7922033 CM |
1144 | buf[0] = '.'; |
1145 | buf[1] = '.'; | |
1146 | ||
2619ba1f | 1147 | key.objectid = objectid; |
d6e4a428 CM |
1148 | key.offset = 0; |
1149 | key.flags = 0; | |
1150 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1151 | ||
2619ba1f | 1152 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
d6e4a428 | 1153 | &key, 1); |
f7922033 CM |
1154 | if (ret) |
1155 | goto error; | |
2619ba1f CM |
1156 | key.objectid = dirid; |
1157 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
d6e4a428 | 1158 | &key, 1); |
4730a4bc CM |
1159 | if (ret) |
1160 | goto error; | |
f7922033 CM |
1161 | error: |
1162 | return ret; | |
1163 | } | |
1164 | ||
1165 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1166 | { | |
1167 | struct inode *inode; | |
1168 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 1169 | struct btrfs_root *root = BTRFS_I(dir)->root; |
f7922033 CM |
1170 | int err = 0; |
1171 | int drop_on_err = 0; | |
2619ba1f | 1172 | u64 objectid; |
f7922033 CM |
1173 | |
1174 | mutex_lock(&root->fs_info->fs_mutex); | |
1175 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1176 | btrfs_set_trans_block_group(trans, dir); |
f7922033 CM |
1177 | if (IS_ERR(trans)) { |
1178 | err = PTR_ERR(trans); | |
1179 | goto out_unlock; | |
1180 | } | |
2619ba1f CM |
1181 | |
1182 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1183 | if (err) { | |
1184 | err = -ENOSPC; | |
1185 | goto out_unlock; | |
1186 | } | |
1187 | ||
31f3c99b CM |
1188 | inode = btrfs_new_inode(trans, root, objectid, |
1189 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
f7922033 CM |
1190 | if (IS_ERR(inode)) { |
1191 | err = PTR_ERR(inode); | |
1192 | goto out_fail; | |
1193 | } | |
1194 | drop_on_err = 1; | |
1195 | inode->i_op = &btrfs_dir_inode_operations; | |
1196 | inode->i_fop = &btrfs_dir_file_operations; | |
31f3c99b | 1197 | btrfs_set_trans_block_group(trans, inode); |
f7922033 | 1198 | |
2619ba1f CM |
1199 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
1200 | if (err) | |
1201 | goto out_fail; | |
1202 | ||
1203 | inode->i_size = 6; | |
1204 | err = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
1205 | if (err) |
1206 | goto out_fail; | |
1207 | err = btrfs_add_link(trans, dentry, inode); | |
1208 | if (err) | |
1209 | goto out_fail; | |
1210 | d_instantiate(dentry, inode); | |
f7922033 | 1211 | drop_on_err = 0; |
cd1bc465 | 1212 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
1213 | btrfs_update_inode_block_group(trans, inode); |
1214 | btrfs_update_inode_block_group(trans, dir); | |
f7922033 CM |
1215 | |
1216 | out_fail: | |
1217 | btrfs_end_transaction(trans, root); | |
1218 | out_unlock: | |
1219 | mutex_unlock(&root->fs_info->fs_mutex); | |
1220 | if (drop_on_err) | |
1221 | iput(inode); | |
35b7e476 | 1222 | btrfs_btree_balance_dirty(root); |
f7922033 CM |
1223 | return err; |
1224 | } | |
1225 | ||
8fd17795 CM |
1226 | static int btrfs_sync_file(struct file *file, |
1227 | struct dentry *dentry, int datasync) | |
1228 | { | |
1229 | struct inode *inode = dentry->d_inode; | |
1230 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1231 | int ret; | |
1232 | struct btrfs_trans_handle *trans; | |
1233 | ||
1234 | mutex_lock(&root->fs_info->fs_mutex); | |
1235 | trans = btrfs_start_transaction(root, 1); | |
1236 | if (!trans) { | |
1237 | ret = -ENOMEM; | |
1238 | goto out; | |
1239 | } | |
1240 | ret = btrfs_commit_transaction(trans, root); | |
1241 | mutex_unlock(&root->fs_info->fs_mutex); | |
1242 | out: | |
1243 | return ret > 0 ? EIO : ret; | |
1244 | } | |
1245 | ||
d5719762 CM |
1246 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
1247 | { | |
1248 | struct btrfs_trans_handle *trans; | |
1249 | struct btrfs_root *root; | |
1250 | int ret; | |
d98237b3 | 1251 | root = btrfs_sb(sb); |
df2ce34c | 1252 | |
d5719762 | 1253 | sb->s_dirt = 0; |
d561c025 | 1254 | if (!wait) { |
7cfcc17e | 1255 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
1256 | return 0; |
1257 | } | |
d561c025 | 1258 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
1259 | trans = btrfs_start_transaction(root, 1); |
1260 | ret = btrfs_commit_transaction(trans, root); | |
1261 | sb->s_dirt = 0; | |
1262 | BUG_ON(ret); | |
1263 | printk("btrfs sync_fs\n"); | |
d561c025 | 1264 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
1265 | return 0; |
1266 | } | |
1267 | ||
75dfe396 | 1268 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
1269 | struct buffer_head *result, int create) |
1270 | { | |
1271 | int ret; | |
1272 | int err = 0; | |
1273 | u64 blocknr; | |
1274 | u64 extent_start = 0; | |
1275 | u64 extent_end = 0; | |
1276 | u64 objectid = inode->i_ino; | |
236454df | 1277 | u32 found_type; |
1de037a4 | 1278 | u64 alloc_hint = 0; |
5caf2a00 | 1279 | struct btrfs_path *path; |
d6e4a428 | 1280 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dee26a9f CM |
1281 | struct btrfs_file_extent_item *item; |
1282 | struct btrfs_leaf *leaf; | |
1283 | struct btrfs_disk_key *found_key; | |
1de037a4 | 1284 | struct btrfs_trans_handle *trans = NULL; |
dee26a9f | 1285 | |
5caf2a00 CM |
1286 | path = btrfs_alloc_path(); |
1287 | BUG_ON(!path); | |
1288 | btrfs_init_path(path); | |
6567e837 | 1289 | if (create) { |
6567e837 | 1290 | WARN_ON(1); |
1de037a4 CM |
1291 | /* this almost but not quite works */ |
1292 | trans = btrfs_start_transaction(root, 1); | |
1293 | if (!trans) { | |
1294 | err = -ENOMEM; | |
1295 | goto out; | |
1296 | } | |
1297 | ret = drop_extents(trans, root, inode, | |
1298 | iblock << inode->i_blkbits, | |
1299 | (iblock + 1) << inode->i_blkbits, | |
1300 | &alloc_hint); | |
1301 | BUG_ON(ret); | |
6567e837 | 1302 | } |
dee26a9f | 1303 | |
236454df | 1304 | ret = btrfs_lookup_file_extent(NULL, root, path, |
9773a788 | 1305 | inode->i_ino, |
236454df | 1306 | iblock << inode->i_blkbits, 0); |
dee26a9f | 1307 | if (ret < 0) { |
dee26a9f CM |
1308 | err = ret; |
1309 | goto out; | |
1310 | } | |
1311 | ||
1312 | if (ret != 0) { | |
5caf2a00 CM |
1313 | if (path->slots[0] == 0) { |
1314 | btrfs_release_path(root, path); | |
1de037a4 | 1315 | goto not_found; |
dee26a9f | 1316 | } |
5caf2a00 | 1317 | path->slots[0]--; |
dee26a9f CM |
1318 | } |
1319 | ||
5caf2a00 | 1320 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 1321 | struct btrfs_file_extent_item); |
5caf2a00 | 1322 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
1323 | blocknr = btrfs_file_extent_disk_blocknr(item); |
1324 | blocknr += btrfs_file_extent_offset(item); | |
1325 | ||
dee26a9f | 1326 | /* are we inside the extent that was found? */ |
5caf2a00 | 1327 | found_key = &leaf->items[path->slots[0]].key; |
236454df | 1328 | found_type = btrfs_disk_key_type(found_key); |
dee26a9f | 1329 | if (btrfs_disk_key_objectid(found_key) != objectid || |
236454df | 1330 | found_type != BTRFS_EXTENT_DATA_KEY) { |
dee26a9f CM |
1331 | extent_end = 0; |
1332 | extent_start = 0; | |
1de037a4 | 1333 | goto not_found; |
dee26a9f | 1334 | } |
236454df CM |
1335 | found_type = btrfs_file_extent_type(item); |
1336 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1337 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1338 | extent_start = extent_start >> inode->i_blkbits; | |
1339 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
3a686375 | 1340 | err = 0; |
1de037a4 | 1341 | if (btrfs_file_extent_disk_blocknr(item) == 0) |
3a686375 | 1342 | goto out; |
236454df | 1343 | if (iblock >= extent_start && iblock < extent_end) { |
236454df CM |
1344 | btrfs_map_bh_to_logical(root, result, blocknr + |
1345 | iblock - extent_start); | |
1346 | goto out; | |
1347 | } | |
1348 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1349 | char *ptr; | |
1350 | char *map; | |
1351 | u32 size; | |
1352 | size = btrfs_file_extent_inline_len(leaf->items + | |
1353 | path->slots[0]); | |
1354 | extent_end = (extent_start + size) >> inode->i_blkbits; | |
1355 | extent_start >>= inode->i_blkbits; | |
1356 | if (iblock < extent_start || iblock > extent_end) { | |
1de037a4 | 1357 | goto not_found; |
236454df CM |
1358 | } |
1359 | ptr = btrfs_file_extent_inline_start(item); | |
1360 | map = kmap(result->b_page); | |
1361 | memcpy(map, ptr, size); | |
1362 | memset(map + size, 0, PAGE_CACHE_SIZE - size); | |
1363 | flush_dcache_page(result->b_page); | |
1364 | kunmap(result->b_page); | |
1365 | set_buffer_uptodate(result); | |
1366 | SetPageChecked(result->b_page); | |
1367 | btrfs_map_bh_to_logical(root, result, 0); | |
dee26a9f | 1368 | } |
1de037a4 CM |
1369 | not_found: |
1370 | if (create) { | |
1371 | struct btrfs_key ins; | |
1372 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, | |
1373 | 1, alloc_hint, (u64)-1, | |
1374 | &ins, 1); | |
1375 | BUG_ON(ret); | |
1376 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
1377 | iblock << inode->i_blkbits, | |
1378 | ins.objectid, ins.offset, | |
1379 | ins.offset); | |
1380 | BUG_ON(ret); | |
1381 | SetPageChecked(result->b_page); | |
1382 | btrfs_map_bh_to_logical(root, result, ins.objectid); | |
1383 | } | |
dee26a9f | 1384 | out: |
1de037a4 CM |
1385 | if (trans) |
1386 | err = btrfs_end_transaction(trans, root); | |
5caf2a00 | 1387 | btrfs_free_path(path); |
75dfe396 CM |
1388 | return err; |
1389 | } | |
1390 | ||
1391 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1392 | struct buffer_head *result, int create) | |
1393 | { | |
1394 | int err; | |
d6e4a428 | 1395 | struct btrfs_root *root = BTRFS_I(inode)->root; |
75dfe396 | 1396 | mutex_lock(&root->fs_info->fs_mutex); |
e8f05c45 | 1397 | err = btrfs_get_block_lock(inode, iblock, result, create); |
dee26a9f CM |
1398 | mutex_unlock(&root->fs_info->fs_mutex); |
1399 | return err; | |
1400 | } | |
1401 | ||
1402 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1403 | unsigned from, unsigned to) | |
1404 | { | |
1de037a4 | 1405 | return block_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f CM |
1406 | } |
1407 | ||
d561c025 CM |
1408 | static void btrfs_write_super(struct super_block *sb) |
1409 | { | |
1410 | btrfs_sync_fs(sb, 1); | |
1411 | } | |
1412 | ||
dee26a9f CM |
1413 | static int btrfs_readpage(struct file *file, struct page *page) |
1414 | { | |
1415 | return mpage_readpage(page, btrfs_get_block); | |
1416 | } | |
1417 | ||
236454df CM |
1418 | /* |
1419 | * While block_write_full_page is writing back the dirty buffers under | |
1420 | * the page lock, whoever dirtied the buffers may decide to clean them | |
1421 | * again at any time. We handle that by only looking at the buffer | |
1422 | * state inside lock_buffer(). | |
1423 | * | |
1424 | * If block_write_full_page() is called for regular writeback | |
1425 | * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a | |
1426 | * locked buffer. This only can happen if someone has written the buffer | |
1427 | * directly, with submit_bh(). At the address_space level PageWriteback | |
1428 | * prevents this contention from occurring. | |
1429 | */ | |
1430 | static int __btrfs_write_full_page(struct inode *inode, struct page *page, | |
1431 | struct writeback_control *wbc) | |
1432 | { | |
1433 | int err; | |
1434 | sector_t block; | |
1435 | sector_t last_block; | |
1436 | struct buffer_head *bh, *head; | |
1437 | const unsigned blocksize = 1 << inode->i_blkbits; | |
1438 | int nr_underway = 0; | |
1439 | ||
1440 | BUG_ON(!PageLocked(page)); | |
1441 | ||
1442 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; | |
1443 | ||
1444 | if (!page_has_buffers(page)) { | |
1445 | create_empty_buffers(page, blocksize, | |
1446 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * Be very careful. We have no exclusion from __set_page_dirty_buffers | |
1451 | * here, and the (potentially unmapped) buffers may become dirty at | |
1452 | * any time. If a buffer becomes dirty here after we've inspected it | |
1453 | * then we just miss that fact, and the page stays dirty. | |
1454 | * | |
1455 | * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; | |
1456 | * handle that here by just cleaning them. | |
1457 | */ | |
1458 | ||
1459 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1460 | head = page_buffers(page); | |
1461 | bh = head; | |
1462 | ||
1463 | /* | |
1464 | * Get all the dirty buffers mapped to disk addresses and | |
1465 | * handle any aliases from the underlying blockdev's mapping. | |
1466 | */ | |
1467 | do { | |
1468 | if (block > last_block) { | |
1469 | /* | |
1470 | * mapped buffers outside i_size will occur, because | |
1471 | * this page can be outside i_size when there is a | |
1472 | * truncate in progress. | |
1473 | */ | |
1474 | /* | |
1475 | * The buffer was zeroed by block_write_full_page() | |
1476 | */ | |
1477 | clear_buffer_dirty(bh); | |
1478 | set_buffer_uptodate(bh); | |
1479 | } else if (!buffer_mapped(bh) && buffer_dirty(bh)) { | |
1480 | WARN_ON(bh->b_size != blocksize); | |
1481 | err = btrfs_get_block(inode, block, bh, 0); | |
35b7e476 CM |
1482 | if (err) { |
1483 | printk("writepage going to recovery err %d\n", err); | |
236454df | 1484 | goto recover; |
35b7e476 | 1485 | } |
236454df CM |
1486 | if (buffer_new(bh)) { |
1487 | /* blockdev mappings never come here */ | |
1488 | clear_buffer_new(bh); | |
236454df CM |
1489 | } |
1490 | } | |
1491 | bh = bh->b_this_page; | |
1492 | block++; | |
1493 | } while (bh != head); | |
1494 | ||
1495 | do { | |
1496 | if (!buffer_mapped(bh)) | |
1497 | continue; | |
1498 | /* | |
1499 | * If it's a fully non-blocking write attempt and we cannot | |
1500 | * lock the buffer then redirty the page. Note that this can | |
1501 | * potentially cause a busy-wait loop from pdflush and kswapd | |
1502 | * activity, but those code paths have their own higher-level | |
1503 | * throttling. | |
1504 | */ | |
1505 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
1506 | lock_buffer(bh); | |
1507 | } else if (test_set_buffer_locked(bh)) { | |
1508 | redirty_page_for_writepage(wbc, page); | |
1509 | continue; | |
1510 | } | |
1511 | if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) { | |
1512 | mark_buffer_async_write(bh); | |
1513 | } else { | |
1514 | unlock_buffer(bh); | |
1515 | } | |
1516 | } while ((bh = bh->b_this_page) != head); | |
1517 | ||
1518 | /* | |
1519 | * The page and its buffers are protected by PageWriteback(), so we can | |
1520 | * drop the bh refcounts early. | |
1521 | */ | |
1522 | BUG_ON(PageWriteback(page)); | |
1523 | set_page_writeback(page); | |
1524 | ||
1525 | do { | |
1526 | struct buffer_head *next = bh->b_this_page; | |
1527 | if (buffer_async_write(bh)) { | |
1528 | submit_bh(WRITE, bh); | |
1529 | nr_underway++; | |
1530 | } | |
1531 | bh = next; | |
1532 | } while (bh != head); | |
1533 | unlock_page(page); | |
1534 | ||
1535 | err = 0; | |
1536 | done: | |
1537 | if (nr_underway == 0) { | |
1538 | /* | |
1539 | * The page was marked dirty, but the buffers were | |
1540 | * clean. Someone wrote them back by hand with | |
1541 | * ll_rw_block/submit_bh. A rare case. | |
1542 | */ | |
1543 | int uptodate = 1; | |
1544 | do { | |
1545 | if (!buffer_uptodate(bh)) { | |
1546 | uptodate = 0; | |
1547 | break; | |
1548 | } | |
1549 | bh = bh->b_this_page; | |
1550 | } while (bh != head); | |
1551 | if (uptodate) | |
1552 | SetPageUptodate(page); | |
1553 | end_page_writeback(page); | |
236454df CM |
1554 | } |
1555 | return err; | |
1556 | ||
1557 | recover: | |
1558 | /* | |
1559 | * ENOSPC, or some other error. We may already have added some | |
1560 | * blocks to the file, so we need to write these out to avoid | |
1561 | * exposing stale data. | |
1562 | * The page is currently locked and not marked for writeback | |
1563 | */ | |
1564 | bh = head; | |
1565 | /* Recovery: lock and submit the mapped buffers */ | |
1566 | do { | |
1567 | if (buffer_mapped(bh) && buffer_dirty(bh)) { | |
1568 | lock_buffer(bh); | |
1569 | mark_buffer_async_write(bh); | |
1570 | } else { | |
1571 | /* | |
1572 | * The buffer may have been set dirty during | |
1573 | * attachment to a dirty page. | |
1574 | */ | |
1575 | clear_buffer_dirty(bh); | |
1576 | } | |
1577 | } while ((bh = bh->b_this_page) != head); | |
1578 | SetPageError(page); | |
1579 | BUG_ON(PageWriteback(page)); | |
1580 | set_page_writeback(page); | |
1581 | do { | |
1582 | struct buffer_head *next = bh->b_this_page; | |
1583 | if (buffer_async_write(bh)) { | |
1584 | clear_buffer_dirty(bh); | |
1585 | submit_bh(WRITE, bh); | |
1586 | nr_underway++; | |
1587 | } | |
1588 | bh = next; | |
1589 | } while (bh != head); | |
1590 | unlock_page(page); | |
1591 | goto done; | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * The generic ->writepage function for buffer-backed address_spaces | |
1596 | */ | |
dee26a9f CM |
1597 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
1598 | { | |
236454df CM |
1599 | struct inode * const inode = page->mapping->host; |
1600 | loff_t i_size = i_size_read(inode); | |
1601 | const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
1602 | unsigned offset; | |
1603 | void *kaddr; | |
1604 | ||
1605 | /* Is the page fully inside i_size? */ | |
1606 | if (page->index < end_index) | |
1607 | return __btrfs_write_full_page(inode, page, wbc); | |
1608 | ||
1609 | /* Is the page fully outside i_size? (truncate in progress) */ | |
1610 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
1611 | if (page->index >= end_index+1 || !offset) { | |
1612 | /* | |
1613 | * The page may have dirty, unmapped buffers. For example, | |
1614 | * they may have been added in ext3_writepage(). Make them | |
1615 | * freeable here, so the page does not leak. | |
1616 | */ | |
1617 | block_invalidatepage(page, 0); | |
1618 | unlock_page(page); | |
1619 | return 0; /* don't care */ | |
1620 | } | |
1621 | ||
1622 | /* | |
1623 | * The page straddles i_size. It must be zeroed out on each and every | |
1624 | * writepage invokation because it may be mmapped. "A file is mapped | |
1625 | * in multiples of the page size. For a file that is not a multiple of | |
1626 | * the page size, the remaining memory is zeroed when mapped, and | |
1627 | * writes to that region are not written out to the file." | |
1628 | */ | |
1629 | kaddr = kmap_atomic(page, KM_USER0); | |
1630 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1631 | flush_dcache_page(page); | |
1632 | kunmap_atomic(kaddr, KM_USER0); | |
1633 | return __btrfs_write_full_page(inode, page, wbc); | |
dee26a9f | 1634 | } |
d561c025 | 1635 | |
f4b9aa8d CM |
1636 | static void btrfs_truncate(struct inode *inode) |
1637 | { | |
d6e4a428 | 1638 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
1639 | int ret; |
1640 | struct btrfs_trans_handle *trans; | |
1641 | ||
1642 | if (!S_ISREG(inode->i_mode)) | |
1643 | return; | |
1644 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1645 | return; | |
1646 | ||
1de037a4 | 1647 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d | 1648 | |
f4b9aa8d CM |
1649 | mutex_lock(&root->fs_info->fs_mutex); |
1650 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1651 | btrfs_set_trans_block_group(trans, inode); |
1de037a4 CM |
1652 | |
1653 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
f4b9aa8d CM |
1654 | ret = btrfs_truncate_in_trans(trans, root, inode); |
1655 | BUG_ON(ret); | |
35b7e476 | 1656 | btrfs_update_inode(trans, root, inode); |
f4b9aa8d CM |
1657 | ret = btrfs_end_transaction(trans, root); |
1658 | BUG_ON(ret); | |
1659 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 1660 | btrfs_btree_balance_dirty(root); |
f4b9aa8d CM |
1661 | } |
1662 | ||
236454df CM |
1663 | static int btrfs_commit_write(struct file *file, struct page *page, |
1664 | unsigned from, unsigned to) | |
1665 | { | |
1666 | struct inode *inode = page->mapping->host; | |
1667 | struct buffer_head *bh; | |
1668 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1669 | ||
1670 | SetPageUptodate(page); | |
1671 | bh = page_buffers(page); | |
1de037a4 | 1672 | set_buffer_uptodate(bh); |
236454df CM |
1673 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { |
1674 | set_page_dirty(page); | |
1675 | } | |
1676 | if (pos > inode->i_size) { | |
1677 | i_size_write(inode, pos); | |
1678 | mark_inode_dirty(inode); | |
1679 | } | |
1680 | return 0; | |
1681 | } | |
1682 | ||
75dfe396 CM |
1683 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1684 | struct page **prepared_pages, | |
1685 | const char __user * buf) | |
1686 | { | |
1687 | long page_fault = 0; | |
1688 | int i; | |
1689 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1690 | ||
1691 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1692 | size_t count = min_t(size_t, | |
1693 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1694 | struct page *page = prepared_pages[i]; | |
1695 | fault_in_pages_readable(buf, count); | |
1696 | ||
1697 | /* Copy data from userspace to the current page */ | |
1698 | kmap(page); | |
1699 | page_fault = __copy_from_user(page_address(page) + offset, | |
1700 | buf, count); | |
1701 | /* Flush processor's dcache for this page */ | |
1702 | flush_dcache_page(page); | |
1703 | kunmap(page); | |
1704 | buf += count; | |
1705 | write_bytes -= count; | |
1706 | ||
1707 | if (page_fault) | |
1708 | break; | |
1709 | } | |
1710 | return page_fault ? -EFAULT : 0; | |
1711 | } | |
1712 | ||
1713 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1714 | { | |
1715 | size_t i; | |
1716 | for (i = 0; i < num_pages; i++) { | |
1717 | if (!pages[i]) | |
1718 | break; | |
1719 | unlock_page(pages[i]); | |
1720 | mark_page_accessed(pages[i]); | |
1721 | page_cache_release(pages[i]); | |
1722 | } | |
1723 | } | |
1724 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1725 | struct btrfs_root *root, | |
1726 | struct file *file, | |
1727 | struct page **pages, | |
1728 | size_t num_pages, | |
1729 | loff_t pos, | |
1730 | size_t write_bytes) | |
1731 | { | |
1732 | int i; | |
1733 | int offset; | |
1734 | int err = 0; | |
1735 | int ret; | |
1736 | int this_write; | |
f254e52c | 1737 | struct inode *inode = file->f_path.dentry->d_inode; |
236454df CM |
1738 | struct buffer_head *bh; |
1739 | struct btrfs_file_extent_item *ei; | |
75dfe396 CM |
1740 | |
1741 | for (i = 0; i < num_pages; i++) { | |
1742 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1743 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1744 | /* FIXME, one block at a time */ |
1745 | ||
1746 | mutex_lock(&root->fs_info->fs_mutex); | |
1747 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1748 | btrfs_set_trans_block_group(trans, inode); |
236454df CM |
1749 | |
1750 | bh = page_buffers(pages[i]); | |
1751 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
1752 | struct btrfs_key key; | |
1753 | struct btrfs_path *path; | |
1754 | char *ptr; | |
1755 | u32 datasize; | |
1756 | ||
1757 | path = btrfs_alloc_path(); | |
1758 | BUG_ON(!path); | |
1759 | key.objectid = inode->i_ino; | |
1760 | key.offset = pages[i]->index << PAGE_CACHE_SHIFT; | |
1761 | key.flags = 0; | |
1762 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
1763 | BUG_ON(write_bytes >= PAGE_CACHE_SIZE); | |
1764 | datasize = offset + | |
1765 | btrfs_file_extent_calc_inline_size(write_bytes); | |
1766 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1767 | datasize); | |
1768 | BUG_ON(ret); | |
1769 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1770 | path->slots[0], struct btrfs_file_extent_item); | |
1771 | btrfs_set_file_extent_generation(ei, trans->transid); | |
1772 | btrfs_set_file_extent_type(ei, | |
1773 | BTRFS_FILE_EXTENT_INLINE); | |
1774 | ptr = btrfs_file_extent_inline_start(ei); | |
098f59c2 CM |
1775 | btrfs_memcpy(root, path->nodes[0]->b_data, |
1776 | ptr, bh->b_data, offset + write_bytes); | |
236454df CM |
1777 | mark_buffer_dirty(path->nodes[0]); |
1778 | btrfs_free_path(path); | |
3a686375 | 1779 | } else if (buffer_mapped(bh)) { |
236454df | 1780 | btrfs_csum_file_block(trans, root, inode->i_ino, |
f254e52c CM |
1781 | pages[i]->index << PAGE_CACHE_SHIFT, |
1782 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
236454df CM |
1783 | kunmap(pages[i]); |
1784 | } | |
f254e52c | 1785 | SetPageChecked(pages[i]); |
e37c9e69 | 1786 | // btrfs_update_inode_block_group(trans, inode); |
f254e52c CM |
1787 | ret = btrfs_end_transaction(trans, root); |
1788 | BUG_ON(ret); | |
1789 | mutex_unlock(&root->fs_info->fs_mutex); | |
1790 | ||
236454df | 1791 | ret = btrfs_commit_write(file, pages[i], offset, |
75dfe396 CM |
1792 | offset + this_write); |
1793 | pos += this_write; | |
1794 | if (ret) { | |
1795 | err = ret; | |
1796 | goto failed; | |
1797 | } | |
1798 | WARN_ON(this_write > write_bytes); | |
1799 | write_bytes -= this_write; | |
1800 | } | |
1801 | failed: | |
1802 | return err; | |
1803 | } | |
1804 | ||
b18c6685 CM |
1805 | static int drop_extents(struct btrfs_trans_handle *trans, |
1806 | struct btrfs_root *root, | |
1807 | struct inode *inode, | |
de428b63 | 1808 | u64 start, u64 end, u64 *hint_block) |
b18c6685 CM |
1809 | { |
1810 | int ret; | |
1811 | struct btrfs_key key; | |
1812 | struct btrfs_leaf *leaf; | |
1813 | int slot; | |
1814 | struct btrfs_file_extent_item *extent; | |
236454df | 1815 | u64 extent_end = 0; |
b18c6685 CM |
1816 | int keep; |
1817 | struct btrfs_file_extent_item old; | |
1818 | struct btrfs_path *path; | |
1819 | u64 search_start = start; | |
1820 | int bookend; | |
236454df CM |
1821 | int found_type; |
1822 | int found_extent; | |
1823 | int found_inline; | |
1824 | ||
b18c6685 CM |
1825 | path = btrfs_alloc_path(); |
1826 | if (!path) | |
1827 | return -ENOMEM; | |
a429e513 CM |
1828 | while(1) { |
1829 | btrfs_release_path(root, path); | |
1830 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
1831 | search_start, -1); | |
1832 | if (ret < 0) | |
70b2befd | 1833 | goto out; |
a429e513 CM |
1834 | if (ret > 0) { |
1835 | if (path->slots[0] == 0) { | |
236454df | 1836 | ret = 0; |
a429e513 CM |
1837 | goto out; |
1838 | } | |
1839 | path->slots[0]--; | |
70b2befd | 1840 | } |
b18c6685 CM |
1841 | keep = 0; |
1842 | bookend = 0; | |
236454df CM |
1843 | found_extent = 0; |
1844 | found_inline = 0; | |
1845 | extent = NULL; | |
b18c6685 CM |
1846 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
1847 | slot = path->slots[0]; | |
1848 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
b18c6685 CM |
1849 | if (key.offset >= end || key.objectid != inode->i_ino) { |
1850 | ret = 0; | |
1851 | goto out; | |
1852 | } | |
236454df CM |
1853 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) { |
1854 | ret = 0; | |
1855 | goto out; | |
1856 | } | |
1857 | extent = btrfs_item_ptr(leaf, slot, | |
1858 | struct btrfs_file_extent_item); | |
1859 | found_type = btrfs_file_extent_type(extent); | |
1860 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1861 | extent_end = key.offset + | |
1862 | (btrfs_file_extent_num_blocks(extent) << | |
1863 | inode->i_blkbits); | |
1864 | found_extent = 1; | |
1865 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1866 | found_inline = 1; | |
1867 | extent_end = key.offset + | |
1868 | btrfs_file_extent_inline_len(leaf->items + slot); | |
1869 | } | |
1870 | ||
1871 | if (!found_extent && !found_inline) { | |
1872 | ret = 0; | |
a429e513 | 1873 | goto out; |
236454df CM |
1874 | } |
1875 | ||
1876 | if (search_start >= extent_end) { | |
1877 | ret = 0; | |
a429e513 | 1878 | goto out; |
236454df CM |
1879 | } |
1880 | ||
3a686375 CM |
1881 | if (found_inline) { |
1882 | u64 mask = root->blocksize - 1; | |
1883 | search_start = (extent_end + mask) & ~mask; | |
1884 | } else | |
1885 | search_start = extent_end; | |
b18c6685 CM |
1886 | |
1887 | if (end < extent_end && end >= key.offset) { | |
236454df | 1888 | if (found_extent) { |
3a686375 CM |
1889 | u64 disk_blocknr = |
1890 | btrfs_file_extent_disk_blocknr(extent); | |
1891 | u64 disk_num_blocks = | |
1892 | btrfs_file_extent_disk_num_blocks(extent); | |
236454df | 1893 | memcpy(&old, extent, sizeof(old)); |
3a686375 CM |
1894 | if (disk_blocknr != 0) { |
1895 | ret = btrfs_inc_extent_ref(trans, root, | |
1896 | disk_blocknr, disk_num_blocks); | |
1897 | BUG_ON(ret); | |
1898 | } | |
236454df CM |
1899 | } |
1900 | WARN_ON(found_inline); | |
b18c6685 CM |
1901 | bookend = 1; |
1902 | } | |
1903 | ||
1904 | if (start > key.offset) { | |
1905 | u64 new_num; | |
a429e513 | 1906 | u64 old_num; |
b18c6685 CM |
1907 | /* truncate existing extent */ |
1908 | keep = 1; | |
1909 | WARN_ON(start & (root->blocksize - 1)); | |
236454df CM |
1910 | if (found_extent) { |
1911 | new_num = (start - key.offset) >> | |
1912 | inode->i_blkbits; | |
1913 | old_num = btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1914 | *hint_block = |
1915 | btrfs_file_extent_disk_blocknr(extent); | |
3a686375 CM |
1916 | if (btrfs_file_extent_disk_blocknr(extent)) { |
1917 | inode->i_blocks -= | |
1918 | (old_num - new_num) << 3; | |
1919 | } | |
236454df CM |
1920 | btrfs_set_file_extent_num_blocks(extent, |
1921 | new_num); | |
1922 | mark_buffer_dirty(path->nodes[0]); | |
1923 | } else { | |
1924 | WARN_ON(1); | |
236454df | 1925 | } |
b18c6685 CM |
1926 | } |
1927 | if (!keep) { | |
236454df CM |
1928 | u64 disk_blocknr = 0; |
1929 | u64 disk_num_blocks = 0; | |
1930 | u64 extent_num_blocks = 0; | |
1931 | if (found_extent) { | |
1932 | disk_blocknr = | |
1933 | btrfs_file_extent_disk_blocknr(extent); | |
1934 | disk_num_blocks = | |
1935 | btrfs_file_extent_disk_num_blocks(extent); | |
1936 | extent_num_blocks = | |
1937 | btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1938 | *hint_block = |
1939 | btrfs_file_extent_disk_blocknr(extent); | |
236454df | 1940 | } |
b18c6685 CM |
1941 | ret = btrfs_del_item(trans, root, path); |
1942 | BUG_ON(ret); | |
1943 | btrfs_release_path(root, path); | |
098f59c2 | 1944 | extent = NULL; |
3a686375 | 1945 | if (found_extent && disk_blocknr != 0) { |
098f59c2 | 1946 | inode->i_blocks -= extent_num_blocks << 3; |
236454df CM |
1947 | ret = btrfs_free_extent(trans, root, |
1948 | disk_blocknr, | |
1949 | disk_num_blocks, 0); | |
1950 | } | |
b18c6685 CM |
1951 | |
1952 | BUG_ON(ret); | |
1953 | if (!bookend && search_start >= end) { | |
1954 | ret = 0; | |
1955 | goto out; | |
1956 | } | |
1957 | if (!bookend) | |
a429e513 | 1958 | continue; |
b18c6685 | 1959 | } |
236454df | 1960 | if (bookend && found_extent) { |
b18c6685 CM |
1961 | /* create bookend */ |
1962 | struct btrfs_key ins; | |
b18c6685 CM |
1963 | ins.objectid = inode->i_ino; |
1964 | ins.offset = end; | |
1965 | ins.flags = 0; | |
1966 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); | |
1967 | ||
1968 | btrfs_release_path(root, path); | |
b18c6685 CM |
1969 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
1970 | sizeof(*extent)); | |
1971 | BUG_ON(ret); | |
1972 | extent = btrfs_item_ptr( | |
1973 | btrfs_buffer_leaf(path->nodes[0]), | |
1974 | path->slots[0], | |
1975 | struct btrfs_file_extent_item); | |
1976 | btrfs_set_file_extent_disk_blocknr(extent, | |
1977 | btrfs_file_extent_disk_blocknr(&old)); | |
1978 | btrfs_set_file_extent_disk_num_blocks(extent, | |
1979 | btrfs_file_extent_disk_num_blocks(&old)); | |
1980 | ||
1981 | btrfs_set_file_extent_offset(extent, | |
1982 | btrfs_file_extent_offset(&old) + | |
1983 | ((end - key.offset) >> inode->i_blkbits)); | |
1984 | WARN_ON(btrfs_file_extent_num_blocks(&old) < | |
3a686375 | 1985 | (extent_end - end) >> inode->i_blkbits); |
b18c6685 | 1986 | btrfs_set_file_extent_num_blocks(extent, |
3a686375 | 1987 | (extent_end - end) >> inode->i_blkbits); |
b18c6685 | 1988 | |
236454df CM |
1989 | btrfs_set_file_extent_type(extent, |
1990 | BTRFS_FILE_EXTENT_REG); | |
b18c6685 CM |
1991 | btrfs_set_file_extent_generation(extent, |
1992 | btrfs_file_extent_generation(&old)); | |
b18c6685 | 1993 | btrfs_mark_buffer_dirty(path->nodes[0]); |
3a686375 CM |
1994 | if (btrfs_file_extent_disk_blocknr(&old) != 0) { |
1995 | inode->i_blocks += | |
1996 | btrfs_file_extent_num_blocks(extent) << 3; | |
1997 | } | |
b18c6685 | 1998 | ret = 0; |
70b2befd | 1999 | goto out; |
b18c6685 | 2000 | } |
b18c6685 | 2001 | } |
b18c6685 | 2002 | out: |
b18c6685 CM |
2003 | btrfs_free_path(path); |
2004 | return ret; | |
2005 | } | |
2006 | ||
2007 | static int prepare_pages(struct btrfs_root *root, | |
75dfe396 CM |
2008 | struct file *file, |
2009 | struct page **pages, | |
2010 | size_t num_pages, | |
2011 | loff_t pos, | |
2932f3ec CM |
2012 | unsigned long first_index, |
2013 | unsigned long last_index, | |
6567e837 CM |
2014 | size_t write_bytes, |
2015 | u64 alloc_extent_start) | |
75dfe396 CM |
2016 | { |
2017 | int i; | |
2018 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
2019 | struct inode *inode = file->f_path.dentry->d_inode; | |
2020 | int offset; | |
2021 | int err = 0; | |
75dfe396 | 2022 | int this_write; |
6567e837 CM |
2023 | struct buffer_head *bh; |
2024 | struct buffer_head *head; | |
75dfe396 CM |
2025 | loff_t isize = i_size_read(inode); |
2026 | ||
2027 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
2028 | ||
2029 | for (i = 0; i < num_pages; i++) { | |
2030 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
2031 | if (!pages[i]) { | |
2032 | err = -ENOMEM; | |
2033 | goto failed_release; | |
2034 | } | |
35b7e476 CM |
2035 | cancel_dirty_page(pages[i], PAGE_CACHE_SIZE); |
2036 | wait_on_page_writeback(pages[i]); | |
75dfe396 CM |
2037 | offset = pos & (PAGE_CACHE_SIZE -1); |
2038 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
35b7e476 CM |
2039 | if (!page_has_buffers(pages[i])) { |
2040 | create_empty_buffers(pages[i], | |
2041 | root->fs_info->sb->s_blocksize, | |
2042 | (1 << BH_Uptodate)); | |
2043 | } | |
6567e837 CM |
2044 | head = page_buffers(pages[i]); |
2045 | bh = head; | |
2046 | do { | |
2047 | err = btrfs_map_bh_to_logical(root, bh, | |
2048 | alloc_extent_start); | |
2049 | BUG_ON(err); | |
2050 | if (err) | |
2051 | goto failed_truncate; | |
2052 | bh = bh->b_this_page; | |
236454df CM |
2053 | if (alloc_extent_start) |
2054 | alloc_extent_start++; | |
6567e837 | 2055 | } while (bh != head); |
75dfe396 | 2056 | pos += this_write; |
75dfe396 CM |
2057 | WARN_ON(this_write > write_bytes); |
2058 | write_bytes -= this_write; | |
2059 | } | |
2060 | return 0; | |
2061 | ||
2062 | failed_release: | |
2063 | btrfs_drop_pages(pages, num_pages); | |
2064 | return err; | |
2065 | ||
2066 | failed_truncate: | |
2067 | btrfs_drop_pages(pages, num_pages); | |
2068 | if (pos > isize) | |
2069 | vmtruncate(inode, isize); | |
2070 | return err; | |
2071 | } | |
2072 | ||
2073 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
2074 | size_t count, loff_t *ppos) | |
2075 | { | |
2076 | loff_t pos; | |
2077 | size_t num_written = 0; | |
2078 | int err = 0; | |
2079 | int ret = 0; | |
75dfe396 | 2080 | struct inode *inode = file->f_path.dentry->d_inode; |
d6e4a428 | 2081 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b18c6685 | 2082 | struct page *pages[8]; |
35b7e476 | 2083 | struct page *pinned[2]; |
2932f3ec CM |
2084 | unsigned long first_index; |
2085 | unsigned long last_index; | |
6567e837 CM |
2086 | u64 start_pos; |
2087 | u64 num_blocks; | |
2088 | u64 alloc_extent_start; | |
de428b63 | 2089 | u64 hint_block; |
6567e837 | 2090 | struct btrfs_trans_handle *trans; |
b18c6685 | 2091 | struct btrfs_key ins; |
35b7e476 CM |
2092 | pinned[0] = NULL; |
2093 | pinned[1] = NULL; | |
75dfe396 CM |
2094 | if (file->f_flags & O_DIRECT) |
2095 | return -EINVAL; | |
2096 | pos = *ppos; | |
75dfe396 CM |
2097 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
2098 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
2099 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
2100 | if (err) | |
2101 | goto out; | |
2102 | if (count == 0) | |
2103 | goto out; | |
2104 | err = remove_suid(file->f_path.dentry); | |
2105 | if (err) | |
2106 | goto out; | |
2107 | file_update_time(file); | |
a429e513 CM |
2108 | |
2109 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); | |
2110 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> | |
2111 | inode->i_blkbits; | |
2112 | ||
75dfe396 | 2113 | mutex_lock(&inode->i_mutex); |
2932f3ec CM |
2114 | first_index = pos >> PAGE_CACHE_SHIFT; |
2115 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
6567e837 | 2116 | |
1de037a4 | 2117 | if ((pos & (PAGE_CACHE_SIZE - 1))) { |
a429e513 CM |
2118 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); |
2119 | if (!PageUptodate(pinned[0])) { | |
2120 | ret = mpage_readpage(pinned[0], btrfs_get_block); | |
2121 | BUG_ON(ret); | |
35b7e476 | 2122 | wait_on_page_locked(pinned[0]); |
a429e513 CM |
2123 | } else { |
2124 | unlock_page(pinned[0]); | |
2125 | } | |
2126 | } | |
1de037a4 | 2127 | if ((pos + count) & (PAGE_CACHE_SIZE - 1)) { |
a429e513 CM |
2128 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); |
2129 | if (!PageUptodate(pinned[1])) { | |
2130 | ret = mpage_readpage(pinned[1], btrfs_get_block); | |
2131 | BUG_ON(ret); | |
35b7e476 | 2132 | wait_on_page_locked(pinned[1]); |
a429e513 CM |
2133 | } else { |
2134 | unlock_page(pinned[1]); | |
2135 | } | |
2136 | } | |
2137 | ||
6567e837 CM |
2138 | mutex_lock(&root->fs_info->fs_mutex); |
2139 | trans = btrfs_start_transaction(root, 1); | |
2140 | if (!trans) { | |
2141 | err = -ENOMEM; | |
b18c6685 | 2142 | mutex_unlock(&root->fs_info->fs_mutex); |
6567e837 CM |
2143 | goto out_unlock; |
2144 | } | |
31f3c99b | 2145 | btrfs_set_trans_block_group(trans, inode); |
a429e513 CM |
2146 | /* FIXME blocksize != 4096 */ |
2147 | inode->i_blocks += num_blocks << 3; | |
de428b63 | 2148 | hint_block = 0; |
b18c6685 | 2149 | if (start_pos < inode->i_size) { |
a429e513 | 2150 | /* FIXME blocksize != pagesize */ |
b18c6685 CM |
2151 | ret = drop_extents(trans, root, inode, |
2152 | start_pos, | |
2153 | (pos + count + root->blocksize -1) & | |
de428b63 | 2154 | ~((u64)root->blocksize - 1), &hint_block); |
236454df | 2155 | BUG_ON(ret); |
b18c6685 | 2156 | } |
3a686375 CM |
2157 | if (inode->i_size < start_pos) { |
2158 | u64 last_pos_in_file; | |
2159 | u64 hole_size; | |
2160 | u64 mask = root->blocksize - 1; | |
2161 | last_pos_in_file = (inode->i_size + mask) & ~mask; | |
2162 | hole_size = (start_pos - last_pos_in_file + mask) & ~mask; | |
2163 | hole_size >>= inode->i_blkbits; | |
2164 | if (last_pos_in_file < start_pos) { | |
2165 | ret = btrfs_insert_file_extent(trans, root, | |
2166 | inode->i_ino, | |
2167 | last_pos_in_file, | |
2168 | 0, 0, hole_size); | |
2169 | } | |
2170 | BUG_ON(ret); | |
2171 | } | |
236454df CM |
2172 | if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size || |
2173 | pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) { | |
4d775673 | 2174 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, |
de428b63 CM |
2175 | num_blocks, hint_block, (u64)-1, |
2176 | &ins, 1); | |
236454df CM |
2177 | BUG_ON(ret); |
2178 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
3a686375 CM |
2179 | start_pos, ins.objectid, ins.offset, |
2180 | ins.offset); | |
236454df CM |
2181 | BUG_ON(ret); |
2182 | } else { | |
2183 | ins.offset = 0; | |
2184 | ins.objectid = 0; | |
2185 | } | |
6567e837 | 2186 | BUG_ON(ret); |
b18c6685 | 2187 | alloc_extent_start = ins.objectid; |
e37c9e69 | 2188 | // btrfs_update_inode_block_group(trans, inode); |
b18c6685 | 2189 | ret = btrfs_end_transaction(trans, root); |
6567e837 CM |
2190 | mutex_unlock(&root->fs_info->fs_mutex); |
2191 | ||
75dfe396 CM |
2192 | while(count > 0) { |
2193 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
2194 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
2195 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
2196 | PAGE_CACHE_SHIFT; | |
b18c6685 CM |
2197 | |
2198 | memset(pages, 0, sizeof(pages)); | |
2199 | ret = prepare_pages(root, file, pages, num_pages, | |
6567e837 CM |
2200 | pos, first_index, last_index, |
2201 | write_bytes, alloc_extent_start); | |
75dfe396 | 2202 | BUG_ON(ret); |
b18c6685 | 2203 | |
6567e837 | 2204 | /* FIXME blocks != pagesize */ |
236454df CM |
2205 | if (alloc_extent_start) |
2206 | alloc_extent_start += num_pages; | |
75dfe396 CM |
2207 | ret = btrfs_copy_from_user(pos, num_pages, |
2208 | write_bytes, pages, buf); | |
2209 | BUG_ON(ret); | |
2210 | ||
f254e52c | 2211 | ret = dirty_and_release_pages(NULL, root, file, pages, |
70b2befd | 2212 | num_pages, pos, write_bytes); |
75dfe396 CM |
2213 | BUG_ON(ret); |
2214 | btrfs_drop_pages(pages, num_pages); | |
2215 | ||
75dfe396 CM |
2216 | buf += write_bytes; |
2217 | count -= write_bytes; | |
2218 | pos += write_bytes; | |
2219 | num_written += write_bytes; | |
2220 | ||
2221 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
35b7e476 | 2222 | btrfs_btree_balance_dirty(root); |
75dfe396 CM |
2223 | cond_resched(); |
2224 | } | |
6567e837 | 2225 | out_unlock: |
75dfe396 CM |
2226 | mutex_unlock(&inode->i_mutex); |
2227 | out: | |
a429e513 CM |
2228 | if (pinned[0]) |
2229 | page_cache_release(pinned[0]); | |
2230 | if (pinned[1]) | |
2231 | page_cache_release(pinned[1]); | |
75dfe396 CM |
2232 | *ppos = pos; |
2233 | current->backing_dev_info = NULL; | |
a429e513 | 2234 | mark_inode_dirty(inode); |
75dfe396 CM |
2235 | return num_written ? num_written : err; |
2236 | } | |
2237 | ||
f254e52c CM |
2238 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
2239 | unsigned long offset, unsigned long size) | |
2240 | { | |
2241 | char *kaddr; | |
2242 | unsigned long left, count = desc->count; | |
d6e4a428 | 2243 | struct inode *inode = page->mapping->host; |
f254e52c CM |
2244 | |
2245 | if (size > count) | |
2246 | size = count; | |
2247 | ||
2248 | if (!PageChecked(page)) { | |
2249 | /* FIXME, do it per block */ | |
d6e4a428 | 2250 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1de037a4 CM |
2251 | int ret; |
2252 | struct buffer_head *bh; | |
2253 | ||
2254 | if (page_has_buffers(page)) { | |
2255 | bh = page_buffers(page); | |
2256 | if (!buffer_mapped(bh)) { | |
2257 | SetPageChecked(page); | |
2258 | goto checked; | |
2259 | } | |
2260 | } | |
236454df | 2261 | |
1de037a4 | 2262 | ret = btrfs_csum_verify_file_block(root, |
236454df CM |
2263 | page->mapping->host->i_ino, |
2264 | page->index << PAGE_CACHE_SHIFT, | |
2265 | kmap(page), PAGE_CACHE_SIZE); | |
f254e52c | 2266 | if (ret) { |
3a686375 | 2267 | if (ret != -ENOENT) { |
1de037a4 | 2268 | printk("failed to verify ino %lu page %lu ret %d\n", |
3a686375 | 2269 | page->mapping->host->i_ino, |
1de037a4 CM |
2270 | page->index, ret); |
2271 | memset(page_address(page), 1, PAGE_CACHE_SIZE); | |
3a686375 CM |
2272 | flush_dcache_page(page); |
2273 | } | |
f254e52c CM |
2274 | } |
2275 | SetPageChecked(page); | |
2276 | kunmap(page); | |
2277 | } | |
1de037a4 | 2278 | checked: |
f254e52c CM |
2279 | /* |
2280 | * Faults on the destination of a read are common, so do it before | |
2281 | * taking the kmap. | |
2282 | */ | |
2283 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
2284 | kaddr = kmap_atomic(page, KM_USER0); | |
2285 | left = __copy_to_user_inatomic(desc->arg.buf, | |
2286 | kaddr + offset, size); | |
2287 | kunmap_atomic(kaddr, KM_USER0); | |
2288 | if (left == 0) | |
2289 | goto success; | |
2290 | } | |
2291 | ||
2292 | /* Do it the slow way */ | |
2293 | kaddr = kmap(page); | |
2294 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
2295 | kunmap(page); | |
2296 | ||
2297 | if (left) { | |
2298 | size -= left; | |
2299 | desc->error = -EFAULT; | |
2300 | } | |
2301 | success: | |
2302 | desc->count = count - size; | |
2303 | desc->written += size; | |
2304 | desc->arg.buf += size; | |
2305 | return size; | |
2306 | } | |
2307 | ||
2308 | /** | |
2309 | * btrfs_file_aio_read - filesystem read routine | |
2310 | * @iocb: kernel I/O control block | |
2311 | * @iov: io vector request | |
2312 | * @nr_segs: number of segments in the iovec | |
2313 | * @pos: current file position | |
2314 | */ | |
2315 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
2316 | unsigned long nr_segs, loff_t pos) | |
2317 | { | |
2318 | struct file *filp = iocb->ki_filp; | |
2319 | ssize_t retval; | |
2320 | unsigned long seg; | |
2321 | size_t count; | |
2322 | loff_t *ppos = &iocb->ki_pos; | |
2323 | ||
2324 | count = 0; | |
2325 | for (seg = 0; seg < nr_segs; seg++) { | |
2326 | const struct iovec *iv = &iov[seg]; | |
2327 | ||
2328 | /* | |
2329 | * If any segment has a negative length, or the cumulative | |
2330 | * length ever wraps negative then return -EINVAL. | |
2331 | */ | |
2332 | count += iv->iov_len; | |
2333 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
2334 | return -EINVAL; | |
2335 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
2336 | continue; | |
2337 | if (seg == 0) | |
2338 | return -EFAULT; | |
2339 | nr_segs = seg; | |
2340 | count -= iv->iov_len; /* This segment is no good */ | |
2341 | break; | |
2342 | } | |
2343 | retval = 0; | |
2344 | if (count) { | |
2345 | for (seg = 0; seg < nr_segs; seg++) { | |
2346 | read_descriptor_t desc; | |
2347 | ||
2348 | desc.written = 0; | |
2349 | desc.arg.buf = iov[seg].iov_base; | |
2350 | desc.count = iov[seg].iov_len; | |
2351 | if (desc.count == 0) | |
2352 | continue; | |
2353 | desc.error = 0; | |
2354 | do_generic_file_read(filp, ppos, &desc, | |
2355 | btrfs_read_actor); | |
2356 | retval += desc.written; | |
2357 | if (desc.error) { | |
2358 | retval = retval ?: desc.error; | |
2359 | break; | |
2360 | } | |
2361 | } | |
2362 | } | |
2363 | return retval; | |
2364 | } | |
2365 | ||
2619ba1f CM |
2366 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
2367 | { | |
2368 | struct btrfs_trans_handle *trans; | |
2369 | struct btrfs_key key; | |
2370 | struct btrfs_root_item root_item; | |
2371 | struct btrfs_inode_item *inode_item; | |
2372 | struct buffer_head *subvol; | |
2373 | struct btrfs_leaf *leaf; | |
2374 | struct btrfs_root *new_root; | |
2375 | struct inode *inode; | |
31f3c99b | 2376 | struct inode *dir; |
2619ba1f CM |
2377 | int ret; |
2378 | u64 objectid; | |
2379 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
2380 | ||
2381 | mutex_lock(&root->fs_info->fs_mutex); | |
2382 | trans = btrfs_start_transaction(root, 1); | |
2383 | BUG_ON(!trans); | |
2384 | ||
31f3c99b | 2385 | subvol = btrfs_alloc_free_block(trans, root, 0); |
5e82849e CM |
2386 | if (subvol == NULL) |
2387 | return -ENOSPC; | |
2619ba1f CM |
2388 | leaf = btrfs_buffer_leaf(subvol); |
2389 | btrfs_set_header_nritems(&leaf->header, 0); | |
2390 | btrfs_set_header_level(&leaf->header, 0); | |
7eccb903 | 2391 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
2619ba1f | 2392 | btrfs_set_header_generation(&leaf->header, trans->transid); |
4d775673 | 2393 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); |
2619ba1f CM |
2394 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, |
2395 | sizeof(leaf->header.fsid)); | |
4d775673 | 2396 | mark_buffer_dirty(subvol); |
2619ba1f CM |
2397 | |
2398 | inode_item = &root_item.inode; | |
2399 | memset(inode_item, 0, sizeof(*inode_item)); | |
2400 | btrfs_set_inode_generation(inode_item, 1); | |
2401 | btrfs_set_inode_size(inode_item, 3); | |
2402 | btrfs_set_inode_nlink(inode_item, 1); | |
2403 | btrfs_set_inode_nblocks(inode_item, 1); | |
2404 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
2405 | ||
7eccb903 | 2406 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
2619ba1f | 2407 | btrfs_set_root_refs(&root_item, 1); |
5e82849e CM |
2408 | brelse(subvol); |
2409 | subvol = NULL; | |
2619ba1f | 2410 | |
2619ba1f CM |
2411 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2412 | 0, &objectid); | |
2413 | BUG_ON(ret); | |
2414 | ||
2415 | btrfs_set_root_dirid(&root_item, new_dirid); | |
2416 | ||
2417 | key.objectid = objectid; | |
2418 | key.offset = 1; | |
2419 | key.flags = 0; | |
2420 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
2421 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2422 | &root_item); | |
2423 | BUG_ON(ret); | |
2424 | ||
2425 | /* | |
2426 | * insert the directory item | |
2427 | */ | |
2428 | key.offset = (u64)-1; | |
31f3c99b | 2429 | dir = root->fs_info->sb->s_root->d_inode; |
2619ba1f | 2430 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
31f3c99b | 2431 | name, namelen, dir->i_ino, &key, 0); |
2619ba1f CM |
2432 | BUG_ON(ret); |
2433 | ||
2434 | ret = btrfs_commit_transaction(trans, root); | |
2435 | BUG_ON(ret); | |
2436 | ||
2437 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
2438 | BUG_ON(!new_root); | |
2439 | ||
2440 | trans = btrfs_start_transaction(new_root, 1); | |
2441 | BUG_ON(!trans); | |
2442 | ||
31f3c99b CM |
2443 | inode = btrfs_new_inode(trans, new_root, new_dirid, |
2444 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
2619ba1f CM |
2445 | inode->i_op = &btrfs_dir_inode_operations; |
2446 | inode->i_fop = &btrfs_dir_file_operations; | |
2447 | ||
2448 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
2449 | BUG_ON(ret); | |
2450 | ||
2451 | inode->i_nlink = 1; | |
2452 | inode->i_size = 6; | |
2453 | ret = btrfs_update_inode(trans, new_root, inode); | |
2454 | BUG_ON(ret); | |
2455 | ||
2456 | ret = btrfs_commit_transaction(trans, new_root); | |
2457 | BUG_ON(ret); | |
2458 | ||
2459 | iput(inode); | |
2460 | ||
2461 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2462 | btrfs_btree_balance_dirty(root); |
2619ba1f CM |
2463 | return 0; |
2464 | } | |
2465 | ||
c5739bba CM |
2466 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
2467 | { | |
2468 | struct btrfs_trans_handle *trans; | |
2469 | struct btrfs_key key; | |
2470 | struct btrfs_root_item new_root_item; | |
2471 | int ret; | |
2472 | u64 objectid; | |
2473 | ||
2619ba1f CM |
2474 | if (!root->ref_cows) |
2475 | return -EINVAL; | |
2476 | ||
c5739bba CM |
2477 | mutex_lock(&root->fs_info->fs_mutex); |
2478 | trans = btrfs_start_transaction(root, 1); | |
2479 | BUG_ON(!trans); | |
2480 | ||
2481 | ret = btrfs_update_inode(trans, root, root->inode); | |
2482 | BUG_ON(ret); | |
2483 | ||
1b05da2e CM |
2484 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2485 | 0, &objectid); | |
c5739bba CM |
2486 | BUG_ON(ret); |
2487 | ||
c5739bba CM |
2488 | memcpy(&new_root_item, &root->root_item, |
2489 | sizeof(new_root_item)); | |
2490 | ||
c5739bba CM |
2491 | key.objectid = objectid; |
2492 | key.offset = 1; | |
2493 | key.flags = 0; | |
2494 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
7eccb903 | 2495 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
c5739bba CM |
2496 | |
2497 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2498 | &new_root_item); | |
2499 | BUG_ON(ret); | |
2500 | ||
c5739bba CM |
2501 | /* |
2502 | * insert the directory item | |
2503 | */ | |
2504 | key.offset = (u64)-1; | |
2505 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2506 | name, namelen, | |
2507 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2508 | &key, 0); | |
2509 | ||
2510 | BUG_ON(ret); | |
2511 | ||
2512 | ret = btrfs_inc_root_ref(trans, root); | |
2513 | BUG_ON(ret); | |
2514 | ||
2515 | ret = btrfs_commit_transaction(trans, root); | |
2516 | BUG_ON(ret); | |
2517 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2518 | btrfs_btree_balance_dirty(root); |
c5739bba CM |
2519 | return 0; |
2520 | } | |
2521 | ||
8352d8a4 CM |
2522 | static int add_disk(struct btrfs_root *root, char *name, int namelen) |
2523 | { | |
2524 | struct block_device *bdev; | |
2525 | struct btrfs_path *path; | |
2526 | struct super_block *sb = root->fs_info->sb; | |
2527 | struct btrfs_root *dev_root = root->fs_info->dev_root; | |
2528 | struct btrfs_trans_handle *trans; | |
2529 | struct btrfs_device_item *dev_item; | |
2530 | struct btrfs_key key; | |
2531 | u16 item_size; | |
2532 | u64 num_blocks; | |
2533 | u64 new_blocks; | |
b4100d64 | 2534 | u64 device_id; |
8352d8a4 | 2535 | int ret; |
b4100d64 | 2536 | |
8352d8a4 CM |
2537 | printk("adding disk %s\n", name); |
2538 | path = btrfs_alloc_path(); | |
2539 | if (!path) | |
2540 | return -ENOMEM; | |
2541 | num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super); | |
2542 | bdev = open_bdev_excl(name, O_RDWR, sb); | |
2543 | if (IS_ERR(bdev)) { | |
2544 | ret = PTR_ERR(bdev); | |
2545 | printk("open bdev excl failed ret %d\n", ret); | |
2546 | goto out_nolock; | |
2547 | } | |
2548 | set_blocksize(bdev, sb->s_blocksize); | |
2549 | new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
2550 | key.objectid = num_blocks; | |
2551 | key.offset = new_blocks; | |
2552 | key.flags = 0; | |
2553 | btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY); | |
2554 | ||
2555 | mutex_lock(&dev_root->fs_info->fs_mutex); | |
2556 | trans = btrfs_start_transaction(dev_root, 1); | |
2557 | item_size = sizeof(*dev_item) + namelen; | |
2558 | printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size); | |
2559 | ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size); | |
2560 | if (ret) { | |
2561 | printk("insert failed %d\n", ret); | |
2562 | close_bdev_excl(bdev); | |
2563 | if (ret > 0) | |
2564 | ret = -EEXIST; | |
2565 | goto out; | |
2566 | } | |
2567 | dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2568 | path->slots[0], struct btrfs_device_item); | |
2569 | btrfs_set_device_pathlen(dev_item, namelen); | |
2570 | memcpy(dev_item + 1, name, namelen); | |
b4100d64 CM |
2571 | |
2572 | device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1; | |
2573 | btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id); | |
2574 | btrfs_set_device_id(dev_item, device_id); | |
8352d8a4 CM |
2575 | mark_buffer_dirty(path->nodes[0]); |
2576 | ||
b4100d64 CM |
2577 | ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks, |
2578 | new_blocks); | |
8352d8a4 CM |
2579 | |
2580 | if (!ret) { | |
2581 | btrfs_set_super_total_blocks(root->fs_info->disk_super, | |
2582 | num_blocks + new_blocks); | |
2583 | i_size_write(root->fs_info->btree_inode, | |
2584 | (num_blocks + new_blocks) << | |
2585 | root->fs_info->btree_inode->i_blkbits); | |
2586 | } | |
2587 | ||
2588 | out: | |
2589 | ret = btrfs_commit_transaction(trans, dev_root); | |
2590 | BUG_ON(ret); | |
2591 | mutex_unlock(&root->fs_info->fs_mutex); | |
2592 | out_nolock: | |
2593 | btrfs_free_path(path); | |
35b7e476 | 2594 | btrfs_btree_balance_dirty(root); |
8352d8a4 CM |
2595 | |
2596 | return ret; | |
2597 | } | |
2598 | ||
c5739bba CM |
2599 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
2600 | cmd, unsigned long arg) | |
2601 | { | |
2602 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2603 | struct btrfs_ioctl_vol_args vol_args; | |
8352d8a4 | 2604 | int ret = 0; |
7e38180e | 2605 | struct btrfs_dir_item *di; |
c5739bba | 2606 | int namelen; |
2619ba1f CM |
2607 | struct btrfs_path *path; |
2608 | u64 root_dirid; | |
c5739bba | 2609 | |
c5739bba CM |
2610 | switch (cmd) { |
2611 | case BTRFS_IOC_SNAP_CREATE: | |
2612 | if (copy_from_user(&vol_args, | |
2613 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2614 | sizeof(vol_args))) | |
2615 | return -EFAULT; | |
2616 | namelen = strlen(vol_args.name); | |
2617 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2618 | return -EINVAL; | |
2619ba1f CM |
2619 | path = btrfs_alloc_path(); |
2620 | if (!path) | |
2621 | return -ENOMEM; | |
2d13d8d0 | 2622 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
2619ba1f | 2623 | mutex_lock(&root->fs_info->fs_mutex); |
7e38180e | 2624 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
2619ba1f CM |
2625 | path, root_dirid, |
2626 | vol_args.name, namelen, 0); | |
2627 | mutex_unlock(&root->fs_info->fs_mutex); | |
2d13d8d0 | 2628 | btrfs_free_path(path); |
7e38180e | 2629 | if (di && !IS_ERR(di)) |
2619ba1f CM |
2630 | return -EEXIST; |
2631 | ||
2632 | if (root == root->fs_info->tree_root) | |
2633 | ret = create_subvol(root, vol_args.name, namelen); | |
2634 | else | |
2635 | ret = create_snapshot(root, vol_args.name, namelen); | |
c5739bba CM |
2636 | WARN_ON(ret); |
2637 | break; | |
8352d8a4 CM |
2638 | case BTRFS_IOC_ADD_DISK: |
2639 | if (copy_from_user(&vol_args, | |
2640 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2641 | sizeof(vol_args))) | |
2642 | return -EFAULT; | |
2643 | namelen = strlen(vol_args.name); | |
2644 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2645 | return -EINVAL; | |
2646 | vol_args.name[namelen] = '\0'; | |
2647 | ret = add_disk(root, vol_args.name, namelen); | |
2648 | break; | |
c5739bba CM |
2649 | default: |
2650 | return -ENOTTY; | |
2651 | } | |
8352d8a4 | 2652 | return ret; |
c5739bba CM |
2653 | } |
2654 | ||
2c90e5d6 CM |
2655 | static struct kmem_cache *btrfs_inode_cachep; |
2656 | struct kmem_cache *btrfs_trans_handle_cachep; | |
2657 | struct kmem_cache *btrfs_transaction_cachep; | |
2658 | struct kmem_cache *btrfs_bit_radix_cachep; | |
2659 | struct kmem_cache *btrfs_path_cachep; | |
2660 | ||
2661 | /* | |
2662 | * Called inside transaction, so use GFP_NOFS | |
2663 | */ | |
2664 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2665 | { | |
2666 | struct btrfs_inode *ei; | |
2667 | ||
2668 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2669 | if (!ei) | |
2670 | return NULL; | |
2c90e5d6 CM |
2671 | return &ei->vfs_inode; |
2672 | } | |
2673 | ||
2674 | static void btrfs_destroy_inode(struct inode *inode) | |
2675 | { | |
2c90e5d6 | 2676 | WARN_ON(!list_empty(&inode->i_dentry)); |
2c90e5d6 CM |
2677 | WARN_ON(inode->i_data.nrpages); |
2678 | ||
2c90e5d6 CM |
2679 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2680 | } | |
2681 | ||
2682 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2683 | unsigned long flags) | |
2684 | { | |
2685 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2686 | ||
f9f3c6b6 | 2687 | if ((flags & (SLAB_CTOR_CONSTRUCTOR)) == |
2c90e5d6 CM |
2688 | SLAB_CTOR_CONSTRUCTOR) { |
2689 | inode_init_once(&ei->vfs_inode); | |
2690 | } | |
2691 | } | |
2692 | ||
2693 | static int init_inodecache(void) | |
2694 | { | |
2695 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
2696 | sizeof(struct btrfs_inode), | |
2697 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2698 | SLAB_MEM_SPREAD), | |
2699 | init_once, NULL); | |
2700 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
2701 | sizeof(struct btrfs_trans_handle), | |
2702 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2703 | SLAB_MEM_SPREAD), | |
2704 | NULL, NULL); | |
2705 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
2706 | sizeof(struct btrfs_transaction), | |
2707 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2708 | SLAB_MEM_SPREAD), | |
2709 | NULL, NULL); | |
2710 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
2711 | sizeof(struct btrfs_transaction), | |
2712 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2713 | SLAB_MEM_SPREAD), | |
2714 | NULL, NULL); | |
2715 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
2716 | 256, | |
2717 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2718 | SLAB_MEM_SPREAD | | |
2719 | SLAB_DESTROY_BY_RCU), | |
2720 | NULL, NULL); | |
2721 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
2722 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
2723 | return -ENOMEM; | |
2724 | return 0; | |
2725 | } | |
2726 | ||
2727 | static void destroy_inodecache(void) | |
2728 | { | |
2729 | kmem_cache_destroy(btrfs_inode_cachep); | |
2730 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2731 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2732 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2733 | kmem_cache_destroy(btrfs_path_cachep); | |
2734 | } | |
2735 | ||
2e635a27 CM |
2736 | static int btrfs_get_sb(struct file_system_type *fs_type, |
2737 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
2738 | { | |
2739 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
2740 | btrfs_fill_super, mnt); | |
2741 | } | |
2742 | ||
236454df CM |
2743 | static int btrfs_getattr(struct vfsmount *mnt, |
2744 | struct dentry *dentry, struct kstat *stat) | |
2745 | { | |
2746 | struct inode *inode = dentry->d_inode; | |
2747 | generic_fillattr(inode, stat); | |
2748 | stat->blksize = 256 * 1024; | |
2749 | return 0; | |
2750 | } | |
2751 | ||
8fd17795 CM |
2752 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2753 | { | |
2754 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
2755 | struct btrfs_super_block *disk_super = root->fs_info->disk_super; | |
2756 | ||
2757 | buf->f_namelen = BTRFS_NAME_LEN; | |
2758 | buf->f_blocks = btrfs_super_total_blocks(disk_super); | |
2759 | buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super); | |
2760 | buf->f_bavail = buf->f_bfree; | |
2761 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2762 | buf->f_type = BTRFS_SUPER_MAGIC; | |
2763 | return 0; | |
2764 | } | |
b5133862 | 2765 | |
e06afa83 CM |
2766 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, |
2767 | struct inode * new_dir,struct dentry *new_dentry) | |
2768 | { | |
2769 | struct btrfs_trans_handle *trans; | |
2770 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2771 | struct inode *new_inode = new_dentry->d_inode; | |
2772 | struct inode *old_inode = old_dentry->d_inode; | |
2773 | struct timespec ctime = CURRENT_TIME; | |
2774 | struct btrfs_path *path; | |
2775 | struct btrfs_dir_item *di; | |
2776 | int ret; | |
2777 | ||
2778 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2779 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2780 | return -ENOTEMPTY; | |
2781 | } | |
2782 | mutex_lock(&root->fs_info->fs_mutex); | |
2783 | trans = btrfs_start_transaction(root, 1); | |
2784 | btrfs_set_trans_block_group(trans, new_dir); | |
2785 | path = btrfs_alloc_path(); | |
2786 | if (!path) { | |
2787 | ret = -ENOMEM; | |
2788 | goto out_fail; | |
2789 | } | |
2790 | ||
2791 | old_dentry->d_inode->i_nlink++; | |
2792 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2793 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2794 | old_inode->i_ctime = ctime; | |
2795 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { | |
2796 | struct btrfs_key *location = &BTRFS_I(new_dir)->location; | |
2797 | u64 old_parent_oid; | |
2798 | di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino, | |
2799 | "..", 2, -1); | |
2800 | if (IS_ERR(di)) { | |
2801 | ret = PTR_ERR(di); | |
2802 | goto out_fail; | |
2803 | } | |
2804 | if (!di) { | |
2805 | ret = -ENOENT; | |
2806 | goto out_fail; | |
2807 | } | |
2808 | old_parent_oid = btrfs_disk_key_objectid(&di->location); | |
2809 | ret = btrfs_del_item(trans, root, path); | |
2810 | if (ret) { | |
2811 | ret = -EIO; | |
2812 | goto out_fail; | |
2813 | } | |
2814 | btrfs_release_path(root, path); | |
2815 | ||
2816 | di = btrfs_lookup_dir_index_item(trans, root, path, | |
2817 | old_inode->i_ino, | |
2818 | old_parent_oid, | |
2819 | "..", 2, -1); | |
2820 | if (IS_ERR(di)) { | |
2821 | ret = PTR_ERR(di); | |
2822 | goto out_fail; | |
2823 | } | |
2824 | if (!di) { | |
2825 | ret = -ENOENT; | |
2826 | goto out_fail; | |
2827 | } | |
2828 | ret = btrfs_del_item(trans, root, path); | |
2829 | if (ret) { | |
2830 | ret = -EIO; | |
2831 | goto out_fail; | |
2832 | } | |
2833 | btrfs_release_path(root, path); | |
2834 | ||
2835 | ret = btrfs_insert_dir_item(trans, root, "..", 2, | |
2836 | old_inode->i_ino, location, 0); | |
2837 | if (ret) | |
2838 | goto out_fail; | |
2839 | } | |
2840 | ||
2841 | ||
e06afa83 CM |
2842 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2843 | if (ret) | |
2844 | goto out_fail; | |
2845 | ||
2846 | if (new_inode) { | |
2847 | new_inode->i_ctime = CURRENT_TIME; | |
2b8d99a7 CM |
2848 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); |
2849 | if (ret) | |
2850 | goto out_fail; | |
e06afa83 CM |
2851 | if (S_ISDIR(new_inode->i_mode)) |
2852 | clear_nlink(new_inode); | |
2853 | else | |
2854 | drop_nlink(new_inode); | |
2855 | btrfs_update_inode(trans, root, new_inode); | |
2856 | } | |
2b8d99a7 CM |
2857 | ret = btrfs_add_link(trans, new_dentry, old_inode); |
2858 | if (ret) | |
2859 | goto out_fail; | |
2860 | ||
e06afa83 CM |
2861 | out_fail: |
2862 | btrfs_free_path(path); | |
2863 | btrfs_end_transaction(trans, root); | |
2864 | mutex_unlock(&root->fs_info->fs_mutex); | |
2865 | return ret; | |
2866 | } | |
2867 | ||
2b8d99a7 CM |
2868 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
2869 | const char *symname) | |
2870 | { | |
2871 | struct btrfs_trans_handle *trans; | |
2872 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2873 | struct btrfs_path *path; | |
2874 | struct btrfs_key key; | |
2875 | struct inode *inode; | |
2876 | int err; | |
2877 | int drop_inode = 0; | |
2878 | u64 objectid; | |
2879 | int name_len; | |
2880 | int datasize; | |
2881 | char *ptr; | |
2882 | struct btrfs_file_extent_item *ei; | |
2883 | ||
2884 | name_len = strlen(symname) + 1; | |
2885 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2886 | return -ENAMETOOLONG; | |
2887 | mutex_lock(&root->fs_info->fs_mutex); | |
2888 | trans = btrfs_start_transaction(root, 1); | |
2889 | btrfs_set_trans_block_group(trans, dir); | |
2890 | ||
2891 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2892 | if (err) { | |
2893 | err = -ENOSPC; | |
2894 | goto out_unlock; | |
2895 | } | |
2896 | ||
2897 | inode = btrfs_new_inode(trans, root, objectid, | |
2898 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2899 | err = PTR_ERR(inode); | |
2900 | if (IS_ERR(inode)) | |
2901 | goto out_unlock; | |
2902 | ||
2903 | btrfs_set_trans_block_group(trans, inode); | |
2904 | err = btrfs_add_nondir(trans, dentry, inode); | |
2905 | if (err) | |
2906 | drop_inode = 1; | |
2907 | else { | |
2908 | inode->i_mapping->a_ops = &btrfs_aops; | |
2909 | inode->i_fop = &btrfs_file_operations; | |
2910 | inode->i_op = &btrfs_file_inode_operations; | |
2911 | } | |
2912 | dir->i_sb->s_dirt = 1; | |
2913 | btrfs_update_inode_block_group(trans, inode); | |
2914 | btrfs_update_inode_block_group(trans, dir); | |
2915 | if (drop_inode) | |
2916 | goto out_unlock; | |
2917 | ||
2918 | path = btrfs_alloc_path(); | |
2919 | BUG_ON(!path); | |
2920 | key.objectid = inode->i_ino; | |
2921 | key.offset = 0; | |
2922 | key.flags = 0; | |
2923 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
2924 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2925 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2926 | datasize); | |
2927 | BUG_ON(err); | |
2928 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2929 | path->slots[0], struct btrfs_file_extent_item); | |
2930 | btrfs_set_file_extent_generation(ei, trans->transid); | |
2931 | btrfs_set_file_extent_type(ei, | |
2932 | BTRFS_FILE_EXTENT_INLINE); | |
2933 | ptr = btrfs_file_extent_inline_start(ei); | |
2934 | btrfs_memcpy(root, path->nodes[0]->b_data, | |
2935 | ptr, symname, name_len); | |
2936 | mark_buffer_dirty(path->nodes[0]); | |
2937 | btrfs_free_path(path); | |
2938 | inode->i_op = &btrfs_symlink_inode_operations; | |
2939 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2940 | inode->i_size = name_len - 1; | |
2941 | btrfs_update_inode(trans, root, inode); | |
2942 | err = 0; | |
2943 | ||
2944 | out_unlock: | |
2945 | btrfs_end_transaction(trans, root); | |
2946 | mutex_unlock(&root->fs_info->fs_mutex); | |
2947 | ||
2948 | if (drop_inode) { | |
2949 | inode_dec_link_count(inode); | |
2950 | iput(inode); | |
2951 | } | |
2952 | btrfs_btree_balance_dirty(root); | |
2953 | return err; | |
2954 | } | |
2955 | ||
2e635a27 CM |
2956 | static struct file_system_type btrfs_fs_type = { |
2957 | .owner = THIS_MODULE, | |
2958 | .name = "btrfs", | |
2959 | .get_sb = btrfs_get_sb, | |
2960 | .kill_sb = kill_block_super, | |
2961 | .fs_flags = FS_REQUIRES_DEV, | |
2962 | }; | |
2963 | ||
e20d96d6 | 2964 | static struct super_operations btrfs_super_ops = { |
134e9731 | 2965 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
2966 | .put_super = btrfs_put_super, |
2967 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
2968 | .write_super = btrfs_write_super, |
2969 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 2970 | .write_inode = btrfs_write_inode, |
b5133862 | 2971 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
2972 | .alloc_inode = btrfs_alloc_inode, |
2973 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2974 | .statfs = btrfs_statfs, |
e20d96d6 CM |
2975 | }; |
2976 | ||
2977 | static struct inode_operations btrfs_dir_inode_operations = { | |
2978 | .lookup = btrfs_lookup, | |
d5719762 | 2979 | .create = btrfs_create, |
134e9731 | 2980 | .unlink = btrfs_unlink, |
2b8d99a7 | 2981 | .link = btrfs_link, |
f7922033 | 2982 | .mkdir = btrfs_mkdir, |
5f443fd2 | 2983 | .rmdir = btrfs_rmdir, |
e06afa83 | 2984 | .rename = btrfs_rename, |
2b8d99a7 | 2985 | .symlink = btrfs_symlink, |
3a686375 | 2986 | .setattr = btrfs_setattr, |
e20d96d6 CM |
2987 | }; |
2988 | ||
d6e4a428 CM |
2989 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2990 | .lookup = btrfs_lookup, | |
2991 | }; | |
2992 | ||
e20d96d6 CM |
2993 | static struct file_operations btrfs_dir_file_operations = { |
2994 | .llseek = generic_file_llseek, | |
2995 | .read = generic_read_dir, | |
2996 | .readdir = btrfs_readdir, | |
c5739bba | 2997 | .ioctl = btrfs_ioctl, |
e20d96d6 CM |
2998 | }; |
2999 | ||
dee26a9f CM |
3000 | static struct address_space_operations btrfs_aops = { |
3001 | .readpage = btrfs_readpage, | |
dee26a9f CM |
3002 | .writepage = btrfs_writepage, |
3003 | .sync_page = block_sync_page, | |
3004 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 3005 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
3006 | }; |
3007 | ||
2b8d99a7 CM |
3008 | static struct address_space_operations btrfs_symlink_aops = { |
3009 | .readpage = btrfs_readpage, | |
3010 | .writepage = btrfs_writepage, | |
3011 | }; | |
3012 | ||
dee26a9f | 3013 | static struct inode_operations btrfs_file_inode_operations = { |
f4b9aa8d | 3014 | .truncate = btrfs_truncate, |
236454df | 3015 | .getattr = btrfs_getattr, |
3a686375 | 3016 | .setattr = btrfs_setattr, |
dee26a9f CM |
3017 | }; |
3018 | ||
3019 | static struct file_operations btrfs_file_operations = { | |
3020 | .llseek = generic_file_llseek, | |
3021 | .read = do_sync_read, | |
e8f05c45 CM |
3022 | .aio_read = btrfs_file_aio_read, |
3023 | .write = btrfs_file_write, | |
dee26a9f CM |
3024 | .mmap = generic_file_mmap, |
3025 | .open = generic_file_open, | |
c5739bba | 3026 | .ioctl = btrfs_ioctl, |
8fd17795 | 3027 | .fsync = btrfs_sync_file, |
dee26a9f | 3028 | }; |
e20d96d6 | 3029 | |
2b8d99a7 CM |
3030 | static struct inode_operations btrfs_symlink_inode_operations = { |
3031 | .readlink = generic_readlink, | |
3032 | .follow_link = page_follow_link_light, | |
3033 | .put_link = page_put_link, | |
3034 | }; | |
3035 | ||
2e635a27 CM |
3036 | static int __init init_btrfs_fs(void) |
3037 | { | |
2c90e5d6 | 3038 | int err; |
2e635a27 | 3039 | printk("btrfs loaded!\n"); |
2c90e5d6 CM |
3040 | err = init_inodecache(); |
3041 | if (err) | |
3042 | return err; | |
2e635a27 | 3043 | return register_filesystem(&btrfs_fs_type); |
d6e4a428 CM |
3044 | destroy_inodecache(); |
3045 | return err; | |
2e635a27 CM |
3046 | } |
3047 | ||
3048 | static void __exit exit_btrfs_fs(void) | |
3049 | { | |
2c90e5d6 | 3050 | destroy_inodecache(); |
2e635a27 CM |
3051 | unregister_filesystem(&btrfs_fs_type); |
3052 | printk("btrfs unloaded\n"); | |
3053 | } | |
3054 | ||
3055 | module_init(init_btrfs_fs) | |
3056 | module_exit(exit_btrfs_fs) | |
3057 | ||
3058 | MODULE_LICENSE("GPL"); |