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 | |
e20d96d6 | 39 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 40 | { |
5caf2a00 | 41 | struct btrfs_path *path; |
e20d96d6 | 42 | struct btrfs_inode_item *inode_item; |
d6e4a428 CM |
43 | struct btrfs_root *root = BTRFS_I(inode)->root; |
44 | struct btrfs_key location; | |
31f3c99b CM |
45 | struct btrfs_block_group_cache *alloc_group; |
46 | u64 alloc_group_block; | |
e20d96d6 | 47 | int ret; |
f4b9aa8d | 48 | |
5caf2a00 CM |
49 | path = btrfs_alloc_path(); |
50 | BUG_ON(!path); | |
51 | btrfs_init_path(path); | |
f4b9aa8d CM |
52 | mutex_lock(&root->fs_info->fs_mutex); |
53 | ||
d6e4a428 CM |
54 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
55 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
e20d96d6 | 56 | if (ret) { |
7cfcc17e | 57 | btrfs_free_path(path); |
d6e4a428 | 58 | goto make_bad; |
e20d96d6 | 59 | } |
5caf2a00 CM |
60 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
61 | path->slots[0], | |
e20d96d6 | 62 | struct btrfs_inode_item); |
2e635a27 | 63 | |
e20d96d6 CM |
64 | inode->i_mode = btrfs_inode_mode(inode_item); |
65 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
66 | inode->i_uid = btrfs_inode_uid(inode_item); | |
67 | inode->i_gid = btrfs_inode_gid(inode_item); | |
68 | inode->i_size = btrfs_inode_size(inode_item); | |
69 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
70 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
71 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
72 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
73 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
74 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
75 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
76 | inode->i_generation = btrfs_inode_generation(inode_item); | |
31f3c99b CM |
77 | alloc_group_block = btrfs_inode_block_group(inode_item); |
78 | ret = radix_tree_gang_lookup(&root->fs_info->block_group_radix, | |
79 | (void **)&alloc_group, | |
80 | alloc_group_block, 1); | |
81 | BUG_ON(!ret); | |
82 | BTRFS_I(inode)->block_group = alloc_group; | |
5caf2a00 | 83 | |
5caf2a00 CM |
84 | btrfs_free_path(path); |
85 | inode_item = NULL; | |
86 | ||
f4b9aa8d | 87 | mutex_unlock(&root->fs_info->fs_mutex); |
1b05da2e | 88 | |
e20d96d6 CM |
89 | switch (inode->i_mode & S_IFMT) { |
90 | #if 0 | |
91 | default: | |
92 | init_special_inode(inode, inode->i_mode, | |
93 | btrfs_inode_rdev(inode_item)); | |
94 | break; | |
95 | #endif | |
96 | case S_IFREG: | |
dee26a9f CM |
97 | inode->i_mapping->a_ops = &btrfs_aops; |
98 | inode->i_fop = &btrfs_file_operations; | |
99 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
100 | break; |
101 | case S_IFDIR: | |
e20d96d6 | 102 | inode->i_fop = &btrfs_dir_file_operations; |
d6e4a428 CM |
103 | if (root == root->fs_info->tree_root) |
104 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
105 | else | |
106 | inode->i_op = &btrfs_dir_inode_operations; | |
e20d96d6 CM |
107 | break; |
108 | case S_IFLNK: | |
2b8d99a7 CM |
109 | inode->i_op = &btrfs_symlink_inode_operations; |
110 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
e20d96d6 | 111 | break; |
2e635a27 | 112 | } |
e20d96d6 | 113 | return; |
d6e4a428 CM |
114 | |
115 | make_bad: | |
116 | btrfs_release_path(root, path); | |
117 | btrfs_free_path(path); | |
118 | mutex_unlock(&root->fs_info->fs_mutex); | |
119 | make_bad_inode(inode); | |
2e635a27 CM |
120 | } |
121 | ||
f68cad0f CM |
122 | static void fill_inode_item(struct btrfs_inode_item *item, |
123 | struct inode *inode) | |
124 | { | |
125 | btrfs_set_inode_uid(item, inode->i_uid); | |
126 | btrfs_set_inode_gid(item, inode->i_gid); | |
127 | btrfs_set_inode_size(item, inode->i_size); | |
128 | btrfs_set_inode_mode(item, inode->i_mode); | |
129 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
130 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
131 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
132 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
133 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
134 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
135 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
136 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
137 | btrfs_set_inode_generation(item, inode->i_generation); | |
31f3c99b CM |
138 | btrfs_set_inode_block_group(item, |
139 | BTRFS_I(inode)->block_group->key.objectid); | |
f68cad0f CM |
140 | } |
141 | ||
f68cad0f CM |
142 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
143 | struct btrfs_root *root, | |
144 | struct inode *inode) | |
145 | { | |
146 | struct btrfs_inode_item *inode_item; | |
147 | struct btrfs_path *path; | |
148 | int ret; | |
149 | ||
150 | path = btrfs_alloc_path(); | |
151 | BUG_ON(!path); | |
152 | btrfs_init_path(path); | |
153 | ret = btrfs_lookup_inode(trans, root, path, | |
154 | &BTRFS_I(inode)->location, 1); | |
155 | if (ret) { | |
156 | if (ret > 0) | |
157 | ret = -ENOENT; | |
158 | goto failed; | |
159 | } | |
160 | ||
161 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
162 | path->slots[0], | |
163 | struct btrfs_inode_item); | |
164 | ||
165 | fill_inode_item(inode_item, inode); | |
166 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
167 | ret = 0; | |
168 | failed: | |
169 | btrfs_release_path(root, path); | |
170 | btrfs_free_path(path); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | ||
5f443fd2 CM |
175 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
176 | struct btrfs_root *root, | |
177 | struct inode *dir, | |
178 | struct dentry *dentry) | |
134e9731 | 179 | { |
5caf2a00 | 180 | struct btrfs_path *path; |
134e9731 CM |
181 | const char *name = dentry->d_name.name; |
182 | int name_len = dentry->d_name.len; | |
7e38180e | 183 | int ret = 0; |
134e9731 CM |
184 | u64 objectid; |
185 | struct btrfs_dir_item *di; | |
186 | ||
5caf2a00 CM |
187 | path = btrfs_alloc_path(); |
188 | BUG_ON(!path); | |
189 | btrfs_init_path(path); | |
7e38180e | 190 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
134e9731 | 191 | name, name_len, -1); |
7e38180e CM |
192 | if (IS_ERR(di)) { |
193 | ret = PTR_ERR(di); | |
134e9731 | 194 | goto err; |
7e38180e CM |
195 | } |
196 | if (!di) { | |
134e9731 CM |
197 | ret = -ENOENT; |
198 | goto err; | |
199 | } | |
d6e4a428 | 200 | objectid = btrfs_disk_key_objectid(&di->location); |
7e38180e CM |
201 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
202 | BUG_ON(ret); | |
203 | btrfs_release_path(root, path); | |
134e9731 | 204 | |
7e38180e CM |
205 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
206 | objectid, name, name_len, -1); | |
207 | if (IS_ERR(di)) { | |
208 | ret = PTR_ERR(di); | |
209 | goto err; | |
210 | } | |
211 | if (!di) { | |
212 | ret = -ENOENT; | |
213 | goto err; | |
214 | } | |
215 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
5f26f772 CM |
216 | BUG_ON(ret); |
217 | ||
134e9731 CM |
218 | dentry->d_inode->i_ctime = dir->i_ctime; |
219 | err: | |
5caf2a00 | 220 | btrfs_free_path(path); |
f68cad0f | 221 | if (!ret) { |
5f26f772 | 222 | dir->i_size -= name_len * 2; |
f68cad0f CM |
223 | btrfs_update_inode(trans, root, dir); |
224 | drop_nlink(dentry->d_inode); | |
225 | btrfs_update_inode(trans, root, dentry->d_inode); | |
cd1bc465 | 226 | dir->i_sb->s_dirt = 1; |
d4dbff95 | 227 | } |
134e9731 CM |
228 | return ret; |
229 | } | |
230 | ||
5f443fd2 CM |
231 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
232 | { | |
233 | struct btrfs_root *root; | |
234 | struct btrfs_trans_handle *trans; | |
235 | int ret; | |
236 | ||
d6e4a428 | 237 | root = BTRFS_I(dir)->root; |
5f443fd2 CM |
238 | mutex_lock(&root->fs_info->fs_mutex); |
239 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 240 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
241 | ret = btrfs_unlink_trans(trans, root, dir, dentry); |
242 | btrfs_end_transaction(trans, root); | |
243 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 244 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
245 | return ret; |
246 | } | |
247 | ||
248 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
249 | { | |
250 | struct inode *inode = dentry->d_inode; | |
251 | int err; | |
252 | int ret; | |
d6e4a428 | 253 | struct btrfs_root *root = BTRFS_I(dir)->root; |
5caf2a00 | 254 | struct btrfs_path *path; |
5f443fd2 CM |
255 | struct btrfs_key key; |
256 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
257 | struct btrfs_key found_key; |
258 | int found_type; | |
5f443fd2 | 259 | struct btrfs_leaf *leaf; |
5f26f772 | 260 | char *goodnames = ".."; |
5f443fd2 | 261 | |
5caf2a00 CM |
262 | path = btrfs_alloc_path(); |
263 | BUG_ON(!path); | |
264 | btrfs_init_path(path); | |
5f443fd2 CM |
265 | mutex_lock(&root->fs_info->fs_mutex); |
266 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 267 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
268 | key.objectid = inode->i_ino; |
269 | key.offset = (u64)-1; | |
5f26f772 CM |
270 | key.flags = (u32)-1; |
271 | while(1) { | |
272 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
273 | if (ret < 0) { | |
274 | err = ret; | |
275 | goto out; | |
276 | } | |
277 | BUG_ON(ret == 0); | |
278 | if (path->slots[0] == 0) { | |
279 | err = -ENOENT; | |
280 | goto out; | |
281 | } | |
282 | path->slots[0]--; | |
283 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
284 | btrfs_disk_key_to_cpu(&found_key, | |
285 | &leaf->items[path->slots[0]].key); | |
286 | found_type = btrfs_key_type(&found_key); | |
287 | if (found_key.objectid != inode->i_ino) { | |
288 | err = -ENOENT; | |
289 | goto out; | |
290 | } | |
291 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
292 | found_type != BTRFS_DIR_INDEX_KEY) || | |
293 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
294 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
295 | err = -ENOTEMPTY; | |
296 | goto out; | |
297 | } | |
298 | ret = btrfs_del_item(trans, root, path); | |
299 | BUG_ON(ret); | |
5f443fd2 | 300 | |
5f26f772 CM |
301 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
302 | break; | |
303 | btrfs_release_path(root, path); | |
5f443fd2 | 304 | } |
5f26f772 | 305 | ret = 0; |
5caf2a00 | 306 | btrfs_release_path(root, path); |
5f443fd2 CM |
307 | |
308 | /* now the directory is empty */ | |
309 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
310 | if (!err) { | |
311 | inode->i_size = 0; | |
312 | } | |
313 | out: | |
7cfcc17e CM |
314 | btrfs_release_path(root, path); |
315 | btrfs_free_path(path); | |
5f443fd2 CM |
316 | mutex_unlock(&root->fs_info->fs_mutex); |
317 | ret = btrfs_end_transaction(trans, root); | |
35b7e476 | 318 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
319 | if (ret && !err) |
320 | err = ret; | |
321 | return err; | |
322 | } | |
323 | ||
134e9731 CM |
324 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
325 | struct btrfs_root *root, | |
326 | struct inode *inode) | |
327 | { | |
5caf2a00 | 328 | struct btrfs_path *path; |
134e9731 | 329 | int ret; |
5caf2a00 | 330 | |
134e9731 | 331 | clear_inode(inode); |
5caf2a00 CM |
332 | |
333 | path = btrfs_alloc_path(); | |
334 | BUG_ON(!path); | |
335 | btrfs_init_path(path); | |
d6e4a428 CM |
336 | ret = btrfs_lookup_inode(trans, root, path, |
337 | &BTRFS_I(inode)->location, -1); | |
134e9731 | 338 | BUG_ON(ret); |
5caf2a00 | 339 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 340 | BUG_ON(ret); |
5caf2a00 | 341 | btrfs_free_path(path); |
134e9731 CM |
342 | return ret; |
343 | } | |
344 | ||
de428b63 CM |
345 | static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path, |
346 | u64 objectid) | |
347 | { | |
348 | struct btrfs_node *node; | |
349 | int i; | |
350 | int nritems; | |
351 | u64 item_objectid; | |
352 | u64 blocknr; | |
353 | int slot; | |
354 | int ret; | |
355 | ||
356 | if (!path->nodes[1]) | |
357 | return; | |
358 | node = btrfs_buffer_node(path->nodes[1]); | |
359 | slot = path->slots[1]; | |
360 | if (slot == 0) | |
361 | return; | |
362 | nritems = btrfs_header_nritems(&node->header); | |
363 | for (i = slot - 1; i >= 0; i--) { | |
364 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); | |
365 | if (item_objectid != objectid) | |
366 | break; | |
367 | blocknr = btrfs_node_blockptr(node, i); | |
368 | ret = readahead_tree_block(root, blocknr); | |
369 | if (ret) | |
370 | break; | |
371 | } | |
372 | } | |
373 | ||
f4b9aa8d CM |
374 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
375 | struct btrfs_root *root, | |
376 | struct inode *inode) | |
377 | { | |
378 | int ret; | |
5caf2a00 | 379 | struct btrfs_path *path; |
f4b9aa8d CM |
380 | struct btrfs_key key; |
381 | struct btrfs_disk_key *found_key; | |
e06afa83 | 382 | u32 found_type; |
f4b9aa8d | 383 | struct btrfs_leaf *leaf; |
f254e52c CM |
384 | struct btrfs_file_extent_item *fi = NULL; |
385 | u64 extent_start = 0; | |
386 | u64 extent_num_blocks = 0; | |
387 | int found_extent; | |
f4b9aa8d | 388 | |
5caf2a00 CM |
389 | path = btrfs_alloc_path(); |
390 | BUG_ON(!path); | |
f4b9aa8d CM |
391 | /* FIXME, add redo link to tree so we don't leak on crash */ |
392 | key.objectid = inode->i_ino; | |
393 | key.offset = (u64)-1; | |
e06afa83 | 394 | key.flags = (u32)-1; |
f4b9aa8d | 395 | while(1) { |
5caf2a00 CM |
396 | btrfs_init_path(path); |
397 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
f4b9aa8d | 398 | if (ret < 0) { |
f4b9aa8d CM |
399 | goto error; |
400 | } | |
401 | if (ret > 0) { | |
5caf2a00 CM |
402 | BUG_ON(path->slots[0] == 0); |
403 | path->slots[0]--; | |
f4b9aa8d | 404 | } |
de428b63 | 405 | reada_truncate(root, path, inode->i_ino); |
5caf2a00 CM |
406 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
407 | found_key = &leaf->items[path->slots[0]].key; | |
e06afa83 | 408 | found_type = btrfs_disk_key_type(found_key); |
f4b9aa8d CM |
409 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
410 | break; | |
e06afa83 CM |
411 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
412 | found_type != BTRFS_DIR_ITEM_KEY && | |
413 | found_type != BTRFS_DIR_INDEX_KEY && | |
414 | found_type != BTRFS_EXTENT_DATA_KEY) | |
f4b9aa8d | 415 | break; |
f4b9aa8d CM |
416 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
417 | break; | |
236454df | 418 | found_extent = 0; |
f254e52c | 419 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
5caf2a00 CM |
420 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
421 | path->slots[0], | |
f254e52c | 422 | struct btrfs_file_extent_item); |
236454df CM |
423 | if (btrfs_file_extent_type(fi) != |
424 | BTRFS_FILE_EXTENT_INLINE) { | |
3a686375 | 425 | u64 num_dec; |
236454df CM |
426 | extent_start = |
427 | btrfs_file_extent_disk_blocknr(fi); | |
428 | extent_num_blocks = | |
429 | btrfs_file_extent_disk_num_blocks(fi); | |
430 | /* FIXME blocksize != 4096 */ | |
3a686375 CM |
431 | num_dec = btrfs_file_extent_num_blocks(fi) << 3; |
432 | if (extent_start != 0) { | |
433 | found_extent = 1; | |
434 | inode->i_blocks -= num_dec; | |
435 | } | |
236454df | 436 | } |
f254e52c | 437 | } |
5caf2a00 | 438 | ret = btrfs_del_item(trans, root, path); |
f4b9aa8d | 439 | BUG_ON(ret); |
5caf2a00 | 440 | btrfs_release_path(root, path); |
f254e52c CM |
441 | if (found_extent) { |
442 | ret = btrfs_free_extent(trans, root, extent_start, | |
443 | extent_num_blocks, 0); | |
444 | BUG_ON(ret); | |
445 | } | |
f4b9aa8d | 446 | } |
f4b9aa8d CM |
447 | ret = 0; |
448 | error: | |
5caf2a00 CM |
449 | btrfs_release_path(root, path); |
450 | btrfs_free_path(path); | |
cd1bc465 | 451 | inode->i_sb->s_dirt = 1; |
f4b9aa8d CM |
452 | return ret; |
453 | } | |
454 | ||
3a686375 CM |
455 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
456 | { | |
457 | struct inode *inode = dentry->d_inode; | |
458 | int err; | |
459 | ||
460 | err = inode_change_ok(inode, attr); | |
461 | if (err) | |
462 | return err; | |
463 | ||
464 | if (S_ISREG(inode->i_mode) && | |
465 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
466 | struct btrfs_trans_handle *trans; | |
467 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
468 | u64 mask = root->blocksize - 1; | |
469 | u64 pos = (inode->i_size + mask) & ~mask; | |
470 | u64 hole_size; | |
471 | ||
472 | if (attr->ia_size < pos) | |
473 | goto out; | |
474 | hole_size = (attr->ia_size - pos + mask) & ~mask; | |
475 | hole_size >>= inode->i_blkbits; | |
476 | ||
477 | mutex_lock(&root->fs_info->fs_mutex); | |
478 | trans = btrfs_start_transaction(root, 1); | |
479 | btrfs_set_trans_block_group(trans, inode); | |
480 | err = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
481 | pos, 0, 0, hole_size); | |
482 | BUG_ON(err); | |
483 | btrfs_end_transaction(trans, root); | |
484 | mutex_unlock(&root->fs_info->fs_mutex); | |
485 | } | |
486 | ||
487 | err = inode_setattr(inode, attr); | |
488 | ||
489 | out: | |
490 | return err; | |
491 | } | |
134e9731 CM |
492 | static void btrfs_delete_inode(struct inode *inode) |
493 | { | |
494 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 495 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
496 | int ret; |
497 | ||
134e9731 CM |
498 | truncate_inode_pages(&inode->i_data, 0); |
499 | if (is_bad_inode(inode)) { | |
500 | goto no_delete; | |
501 | } | |
502 | inode->i_size = 0; | |
134e9731 CM |
503 | mutex_lock(&root->fs_info->fs_mutex); |
504 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 505 | btrfs_set_trans_block_group(trans, inode); |
e06afa83 CM |
506 | ret = btrfs_truncate_in_trans(trans, root, inode); |
507 | BUG_ON(ret); | |
134e9731 CM |
508 | btrfs_free_inode(trans, root, inode); |
509 | btrfs_end_transaction(trans, root); | |
510 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 511 | btrfs_btree_balance_dirty(root); |
134e9731 CM |
512 | return; |
513 | no_delete: | |
514 | clear_inode(inode); | |
515 | } | |
516 | ||
e20d96d6 | 517 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
d6e4a428 | 518 | struct btrfs_key *location) |
e20d96d6 CM |
519 | { |
520 | const char *name = dentry->d_name.name; | |
521 | int namelen = dentry->d_name.len; | |
522 | struct btrfs_dir_item *di; | |
5caf2a00 | 523 | struct btrfs_path *path; |
d6e4a428 | 524 | struct btrfs_root *root = BTRFS_I(dir)->root; |
e20d96d6 CM |
525 | int ret; |
526 | ||
5caf2a00 CM |
527 | path = btrfs_alloc_path(); |
528 | BUG_ON(!path); | |
529 | btrfs_init_path(path); | |
7e38180e | 530 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
e20d96d6 | 531 | namelen, 0); |
7e38180e | 532 | if (!di || IS_ERR(di)) { |
d6e4a428 | 533 | location->objectid = 0; |
2c90e5d6 | 534 | ret = 0; |
e20d96d6 CM |
535 | goto out; |
536 | } | |
d6e4a428 | 537 | btrfs_disk_key_to_cpu(location, &di->location); |
e20d96d6 | 538 | out: |
5caf2a00 CM |
539 | btrfs_release_path(root, path); |
540 | btrfs_free_path(path); | |
e20d96d6 CM |
541 | return ret; |
542 | } | |
543 | ||
35b7e476 | 544 | static int fixup_tree_root_location(struct btrfs_root *root, |
d6e4a428 CM |
545 | struct btrfs_key *location, |
546 | struct btrfs_root **sub_root) | |
547 | { | |
548 | struct btrfs_path *path; | |
549 | struct btrfs_root_item *ri; | |
d6e4a428 CM |
550 | |
551 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
552 | return 0; | |
553 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
554 | return 0; | |
555 | ||
556 | path = btrfs_alloc_path(); | |
557 | BUG_ON(!path); | |
558 | mutex_lock(&root->fs_info->fs_mutex); | |
559 | ||
0f7d52f4 CM |
560 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
561 | if (IS_ERR(*sub_root)) | |
562 | return PTR_ERR(*sub_root); | |
563 | ||
564 | ri = &(*sub_root)->root_item; | |
d6e4a428 CM |
565 | location->objectid = btrfs_root_dirid(ri); |
566 | location->flags = 0; | |
567 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
568 | location->offset = 0; | |
0f7d52f4 | 569 | |
d6e4a428 CM |
570 | btrfs_free_path(path); |
571 | mutex_unlock(&root->fs_info->fs_mutex); | |
0f7d52f4 | 572 | return 0; |
d6e4a428 CM |
573 | } |
574 | ||
35b7e476 | 575 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
c5739bba CM |
576 | { |
577 | struct btrfs_iget_args *args = p; | |
578 | inode->i_ino = args->ino; | |
579 | BTRFS_I(inode)->root = args->root; | |
580 | return 0; | |
581 | } | |
582 | ||
35b7e476 | 583 | static int btrfs_find_actor(struct inode *inode, void *opaque) |
c5739bba CM |
584 | { |
585 | struct btrfs_iget_args *args = opaque; | |
586 | return (args->ino == inode->i_ino && | |
587 | args->root == BTRFS_I(inode)->root); | |
588 | } | |
589 | ||
35b7e476 CM |
590 | static struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
591 | struct btrfs_root *root) | |
c5739bba CM |
592 | { |
593 | struct inode *inode; | |
594 | struct btrfs_iget_args args; | |
595 | args.ino = objectid; | |
596 | args.root = root; | |
597 | ||
598 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
599 | btrfs_init_locked_inode, | |
600 | (void *)&args); | |
601 | return inode; | |
602 | } | |
d6e4a428 | 603 | |
e20d96d6 CM |
604 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
605 | struct nameidata *nd) | |
606 | { | |
607 | struct inode * inode; | |
d6e4a428 CM |
608 | struct btrfs_inode *bi = BTRFS_I(dir); |
609 | struct btrfs_root *root = bi->root; | |
610 | struct btrfs_root *sub_root = root; | |
611 | struct btrfs_key location; | |
e20d96d6 CM |
612 | int ret; |
613 | ||
614 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
615 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 616 | mutex_lock(&root->fs_info->fs_mutex); |
d6e4a428 | 617 | ret = btrfs_inode_by_name(dir, dentry, &location); |
22b0ebda | 618 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
619 | if (ret < 0) |
620 | return ERR_PTR(ret); | |
621 | inode = NULL; | |
d6e4a428 CM |
622 | if (location.objectid) { |
623 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
624 | if (ret < 0) | |
625 | return ERR_PTR(ret); | |
626 | if (ret > 0) | |
627 | return ERR_PTR(-ENOENT); | |
c5739bba CM |
628 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
629 | sub_root); | |
e20d96d6 CM |
630 | if (!inode) |
631 | return ERR_PTR(-EACCES); | |
d6e4a428 | 632 | if (inode->i_state & I_NEW) { |
0f7d52f4 | 633 | if (sub_root != root) { |
c5739bba | 634 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
0f7d52f4 CM |
635 | igrab(inode); |
636 | sub_root->inode = inode; | |
637 | } | |
d6e4a428 CM |
638 | BTRFS_I(inode)->root = sub_root; |
639 | memcpy(&BTRFS_I(inode)->location, &location, | |
640 | sizeof(location)); | |
641 | btrfs_read_locked_inode(inode); | |
642 | unlock_new_inode(inode); | |
643 | } | |
e20d96d6 CM |
644 | } |
645 | return d_splice_alias(inode, dentry); | |
646 | } | |
647 | ||
de428b63 CM |
648 | static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path, |
649 | u64 objectid) | |
090d1875 CM |
650 | { |
651 | struct btrfs_node *node; | |
652 | int i; | |
de428b63 | 653 | u32 nritems; |
090d1875 CM |
654 | u64 item_objectid; |
655 | u64 blocknr; | |
656 | int slot; | |
de428b63 | 657 | int ret; |
090d1875 CM |
658 | |
659 | if (!path->nodes[1]) | |
660 | return; | |
661 | node = btrfs_buffer_node(path->nodes[1]); | |
662 | slot = path->slots[1]; | |
090d1875 | 663 | nritems = btrfs_header_nritems(&node->header); |
de428b63 | 664 | for (i = slot + 1; i < nritems; i++) { |
090d1875 CM |
665 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); |
666 | if (item_objectid != objectid) | |
667 | break; | |
668 | blocknr = btrfs_node_blockptr(node, i); | |
de428b63 CM |
669 | ret = readahead_tree_block(root, blocknr); |
670 | if (ret) | |
671 | break; | |
090d1875 CM |
672 | } |
673 | } | |
674 | ||
e20d96d6 CM |
675 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
676 | { | |
677 | struct inode *inode = filp->f_path.dentry->d_inode; | |
d6e4a428 | 678 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e20d96d6 CM |
679 | struct btrfs_item *item; |
680 | struct btrfs_dir_item *di; | |
681 | struct btrfs_key key; | |
5caf2a00 | 682 | struct btrfs_path *path; |
e20d96d6 CM |
683 | int ret; |
684 | u32 nritems; | |
685 | struct btrfs_leaf *leaf; | |
686 | int slot; | |
687 | int advance; | |
688 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 689 | int over = 0; |
7e38180e CM |
690 | u32 di_cur; |
691 | u32 di_total; | |
692 | u32 di_len; | |
693 | int key_type = BTRFS_DIR_INDEX_KEY; | |
d6e4a428 CM |
694 | |
695 | /* FIXME, use a real flag for deciding about the key type */ | |
696 | if (root->fs_info->tree_root == root) | |
697 | key_type = BTRFS_DIR_ITEM_KEY; | |
22b0ebda | 698 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 699 | key.objectid = inode->i_ino; |
e20d96d6 | 700 | key.flags = 0; |
d6e4a428 | 701 | btrfs_set_key_type(&key, key_type); |
e20d96d6 | 702 | key.offset = filp->f_pos; |
5caf2a00 CM |
703 | path = btrfs_alloc_path(); |
704 | btrfs_init_path(path); | |
705 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1b05da2e | 706 | if (ret < 0) |
e20d96d6 | 707 | goto err; |
7f5c1516 | 708 | advance = 0; |
de428b63 | 709 | reada_leaves(root, path, inode->i_ino); |
e20d96d6 | 710 | while(1) { |
5caf2a00 | 711 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 712 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 713 | slot = path->slots[0]; |
dee26a9f CM |
714 | if (advance || slot >= nritems) { |
715 | if (slot >= nritems -1) { | |
de428b63 | 716 | reada_leaves(root, path, inode->i_ino); |
5caf2a00 | 717 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
718 | if (ret) |
719 | break; | |
5caf2a00 | 720 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 721 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 722 | slot = path->slots[0]; |
e20d96d6 CM |
723 | } else { |
724 | slot++; | |
5caf2a00 | 725 | path->slots[0]++; |
e20d96d6 CM |
726 | } |
727 | } | |
728 | advance = 1; | |
729 | item = leaf->items + slot; | |
e20d96d6 CM |
730 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
731 | break; | |
d6e4a428 | 732 | if (btrfs_disk_key_type(&item->key) != key_type) |
a429e513 | 733 | break; |
7f5c1516 CM |
734 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
735 | continue; | |
7fcde0e3 | 736 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
dee26a9f | 737 | advance = 1; |
e20d96d6 | 738 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
7e38180e CM |
739 | di_cur = 0; |
740 | di_total = btrfs_item_size(leaf->items + slot); | |
741 | while(di_cur < di_total) { | |
742 | over = filldir(dirent, (const char *)(di + 1), | |
743 | btrfs_dir_name_len(di), | |
744 | btrfs_disk_key_offset(&item->key), | |
745 | btrfs_disk_key_objectid(&di->location), | |
746 | d_type); | |
747 | if (over) | |
748 | goto nopos; | |
749 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
750 | di_cur += di_len; | |
751 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
752 | } | |
e20d96d6 | 753 | } |
7fcde0e3 CM |
754 | filp->f_pos++; |
755 | nopos: | |
e20d96d6 CM |
756 | ret = 0; |
757 | err: | |
5caf2a00 CM |
758 | btrfs_release_path(root, path); |
759 | btrfs_free_path(path); | |
22b0ebda | 760 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
761 | return ret; |
762 | } | |
763 | ||
764 | static void btrfs_put_super (struct super_block * sb) | |
765 | { | |
766 | struct btrfs_root *root = btrfs_sb(sb); | |
767 | int ret; | |
768 | ||
769 | ret = close_ctree(root); | |
770 | if (ret) { | |
771 | printk("close ctree returns %d\n", ret); | |
772 | } | |
773 | sb->s_fs_info = NULL; | |
774 | } | |
2e635a27 CM |
775 | |
776 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
777 | { | |
778 | struct inode * inode; | |
e20d96d6 CM |
779 | struct dentry * root_dentry; |
780 | struct btrfs_super_block *disk_super; | |
0f7d52f4 | 781 | struct btrfs_root *tree_root; |
d6e4a428 | 782 | struct btrfs_inode *bi; |
2e635a27 CM |
783 | |
784 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 785 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 786 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 787 | sb->s_time_gran = 1; |
e20d96d6 | 788 | |
0f7d52f4 | 789 | tree_root = open_ctree(sb); |
d98237b3 | 790 | |
0f7d52f4 | 791 | if (!tree_root) { |
e20d96d6 CM |
792 | printk("btrfs: open_ctree failed\n"); |
793 | return -EIO; | |
794 | } | |
0f7d52f4 CM |
795 | sb->s_fs_info = tree_root; |
796 | disk_super = tree_root->fs_info->disk_super; | |
e20d96d6 CM |
797 | printk("read in super total blocks %Lu root %Lu\n", |
798 | btrfs_super_total_blocks(disk_super), | |
799 | btrfs_super_root_dir(disk_super)); | |
800 | ||
c5739bba CM |
801 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
802 | tree_root); | |
d6e4a428 CM |
803 | bi = BTRFS_I(inode); |
804 | bi->location.objectid = inode->i_ino; | |
805 | bi->location.offset = 0; | |
806 | bi->location.flags = 0; | |
0f7d52f4 | 807 | bi->root = tree_root; |
d6e4a428 CM |
808 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
809 | ||
2e635a27 CM |
810 | if (!inode) |
811 | return -ENOMEM; | |
e20d96d6 CM |
812 | if (inode->i_state & I_NEW) { |
813 | btrfs_read_locked_inode(inode); | |
814 | unlock_new_inode(inode); | |
815 | } | |
2e635a27 | 816 | |
e20d96d6 CM |
817 | root_dentry = d_alloc_root(inode); |
818 | if (!root_dentry) { | |
2e635a27 CM |
819 | iput(inode); |
820 | return -ENOMEM; | |
821 | } | |
e20d96d6 CM |
822 | sb->s_root = root_dentry; |
823 | ||
2e635a27 CM |
824 | return 0; |
825 | } | |
826 | ||
4730a4bc CM |
827 | static int btrfs_write_inode(struct inode *inode, int wait) |
828 | { | |
d6e4a428 | 829 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4730a4bc | 830 | struct btrfs_trans_handle *trans; |
b5133862 CM |
831 | int ret = 0; |
832 | ||
833 | if (wait) { | |
834 | mutex_lock(&root->fs_info->fs_mutex); | |
835 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 836 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
837 | ret = btrfs_commit_transaction(trans, root); |
838 | mutex_unlock(&root->fs_info->fs_mutex); | |
839 | } | |
840 | return ret; | |
841 | } | |
842 | ||
843 | static void btrfs_dirty_inode(struct inode *inode) | |
844 | { | |
845 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
846 | struct btrfs_trans_handle *trans; | |
4730a4bc CM |
847 | |
848 | mutex_lock(&root->fs_info->fs_mutex); | |
849 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 850 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
851 | btrfs_update_inode(trans, root, inode); |
852 | btrfs_end_transaction(trans, root); | |
4730a4bc | 853 | mutex_unlock(&root->fs_info->fs_mutex); |
35b7e476 | 854 | btrfs_btree_balance_dirty(root); |
4730a4bc CM |
855 | } |
856 | ||
d5719762 | 857 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2619ba1f | 858 | struct btrfs_root *root, |
31f3c99b CM |
859 | u64 objectid, |
860 | struct btrfs_block_group_cache *group, | |
861 | int mode) | |
d5719762 CM |
862 | { |
863 | struct inode *inode; | |
864 | struct btrfs_inode_item inode_item; | |
1b05da2e | 865 | struct btrfs_key *location; |
d5719762 | 866 | int ret; |
de428b63 | 867 | int owner; |
d5719762 | 868 | |
2619ba1f | 869 | inode = new_inode(root->fs_info->sb); |
d5719762 CM |
870 | if (!inode) |
871 | return ERR_PTR(-ENOMEM); | |
872 | ||
2619ba1f | 873 | BTRFS_I(inode)->root = root; |
de428b63 CM |
874 | if (mode & S_IFDIR) |
875 | owner = 0; | |
876 | else | |
877 | owner = 1; | |
878 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
31f3c99b | 879 | BTRFS_I(inode)->block_group = group; |
d5719762 CM |
880 | |
881 | inode->i_uid = current->fsuid; | |
882 | inode->i_gid = current->fsgid; | |
883 | inode->i_mode = mode; | |
884 | inode->i_ino = objectid; | |
885 | inode->i_blocks = 0; | |
c5739bba | 886 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
d5719762 | 887 | fill_inode_item(&inode_item, inode); |
1b05da2e CM |
888 | location = &BTRFS_I(inode)->location; |
889 | location->objectid = objectid; | |
890 | location->flags = 0; | |
891 | location->offset = 0; | |
892 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
d5719762 CM |
893 | |
894 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
895 | BUG_ON(ret); | |
896 | ||
897 | insert_inode_hash(inode); | |
d5719762 CM |
898 | return inode; |
899 | } | |
900 | ||
901 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
902 | struct dentry *dentry, struct inode *inode) | |
903 | { | |
904 | int ret; | |
d6e4a428 CM |
905 | struct btrfs_key key; |
906 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
907 | key.objectid = inode->i_ino; | |
908 | key.flags = 0; | |
909 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
910 | key.offset = 0; | |
911 | ||
912 | ret = btrfs_insert_dir_item(trans, root, | |
d5719762 CM |
913 | dentry->d_name.name, dentry->d_name.len, |
914 | dentry->d_parent->d_inode->i_ino, | |
d6e4a428 | 915 | &key, 0); |
4730a4bc | 916 | if (ret == 0) { |
5f26f772 | 917 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
d6e4a428 | 918 | ret = btrfs_update_inode(trans, root, |
4730a4bc CM |
919 | dentry->d_parent->d_inode); |
920 | } | |
d5719762 CM |
921 | return ret; |
922 | } | |
923 | ||
924 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
925 | struct dentry *dentry, struct inode *inode) | |
926 | { | |
927 | int err = btrfs_add_link(trans, dentry, inode); | |
928 | if (!err) { | |
929 | d_instantiate(dentry, inode); | |
930 | return 0; | |
931 | } | |
2c90e5d6 CM |
932 | if (err > 0) |
933 | err = -EEXIST; | |
d5719762 CM |
934 | return err; |
935 | } | |
936 | ||
937 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
938 | int mode, struct nameidata *nd) | |
939 | { | |
940 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 941 | struct btrfs_root *root = BTRFS_I(dir)->root; |
d5719762 CM |
942 | struct inode *inode; |
943 | int err; | |
134e9731 | 944 | int drop_inode = 0; |
2619ba1f | 945 | u64 objectid; |
d5719762 | 946 | |
d561c025 | 947 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 | 948 | trans = btrfs_start_transaction(root, 1); |
31f3c99b | 949 | btrfs_set_trans_block_group(trans, dir); |
2619ba1f CM |
950 | |
951 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
952 | if (err) { | |
953 | err = -ENOSPC; | |
954 | goto out_unlock; | |
955 | } | |
956 | ||
31f3c99b CM |
957 | inode = btrfs_new_inode(trans, root, objectid, |
958 | BTRFS_I(dir)->block_group, mode); | |
d5719762 CM |
959 | err = PTR_ERR(inode); |
960 | if (IS_ERR(inode)) | |
d561c025 | 961 | goto out_unlock; |
31f3c99b CM |
962 | |
963 | btrfs_set_trans_block_group(trans, inode); | |
d5719762 | 964 | err = btrfs_add_nondir(trans, dentry, inode); |
134e9731 CM |
965 | if (err) |
966 | drop_inode = 1; | |
dee26a9f CM |
967 | else { |
968 | inode->i_mapping->a_ops = &btrfs_aops; | |
969 | inode->i_fop = &btrfs_file_operations; | |
970 | inode->i_op = &btrfs_file_inode_operations; | |
971 | } | |
d5719762 | 972 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
973 | btrfs_update_inode_block_group(trans, inode); |
974 | btrfs_update_inode_block_group(trans, dir); | |
d561c025 | 975 | out_unlock: |
22b0ebda | 976 | btrfs_end_transaction(trans, root); |
d561c025 | 977 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 978 | |
134e9731 CM |
979 | if (drop_inode) { |
980 | inode_dec_link_count(inode); | |
981 | iput(inode); | |
982 | } | |
35b7e476 | 983 | btrfs_btree_balance_dirty(root); |
d5719762 CM |
984 | return err; |
985 | } | |
986 | ||
2b8d99a7 CM |
987 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, |
988 | struct dentry *dentry) | |
989 | { | |
990 | struct btrfs_trans_handle *trans; | |
991 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
992 | struct inode *inode = old_dentry->d_inode; | |
993 | int err; | |
994 | int drop_inode = 0; | |
995 | ||
996 | if (inode->i_nlink == 0) | |
997 | return -ENOENT; | |
998 | ||
999 | inc_nlink(inode); | |
1000 | mutex_lock(&root->fs_info->fs_mutex); | |
1001 | trans = btrfs_start_transaction(root, 1); | |
1002 | btrfs_set_trans_block_group(trans, dir); | |
1003 | atomic_inc(&inode->i_count); | |
1004 | err = btrfs_add_nondir(trans, dentry, inode); | |
1005 | if (err) | |
1006 | drop_inode = 1; | |
1007 | dir->i_sb->s_dirt = 1; | |
1008 | btrfs_update_inode_block_group(trans, dir); | |
1009 | btrfs_update_inode(trans, root, inode); | |
1010 | ||
1011 | btrfs_end_transaction(trans, root); | |
1012 | mutex_unlock(&root->fs_info->fs_mutex); | |
1013 | ||
1014 | if (drop_inode) { | |
1015 | inode_dec_link_count(inode); | |
1016 | iput(inode); | |
1017 | } | |
1018 | btrfs_btree_balance_dirty(root); | |
1019 | return err; | |
1020 | } | |
1021 | ||
f7922033 | 1022 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
2619ba1f CM |
1023 | struct btrfs_root *root, |
1024 | u64 objectid, u64 dirid) | |
f7922033 | 1025 | { |
f7922033 CM |
1026 | int ret; |
1027 | char buf[2]; | |
d6e4a428 CM |
1028 | struct btrfs_key key; |
1029 | ||
f7922033 CM |
1030 | buf[0] = '.'; |
1031 | buf[1] = '.'; | |
1032 | ||
2619ba1f | 1033 | key.objectid = objectid; |
d6e4a428 CM |
1034 | key.offset = 0; |
1035 | key.flags = 0; | |
1036 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1037 | ||
2619ba1f | 1038 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
d6e4a428 | 1039 | &key, 1); |
f7922033 CM |
1040 | if (ret) |
1041 | goto error; | |
2619ba1f CM |
1042 | key.objectid = dirid; |
1043 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
d6e4a428 | 1044 | &key, 1); |
4730a4bc CM |
1045 | if (ret) |
1046 | goto error; | |
f7922033 CM |
1047 | error: |
1048 | return ret; | |
1049 | } | |
1050 | ||
1051 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1052 | { | |
1053 | struct inode *inode; | |
1054 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 1055 | struct btrfs_root *root = BTRFS_I(dir)->root; |
f7922033 CM |
1056 | int err = 0; |
1057 | int drop_on_err = 0; | |
2619ba1f | 1058 | u64 objectid; |
f7922033 CM |
1059 | |
1060 | mutex_lock(&root->fs_info->fs_mutex); | |
1061 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1062 | btrfs_set_trans_block_group(trans, dir); |
f7922033 CM |
1063 | if (IS_ERR(trans)) { |
1064 | err = PTR_ERR(trans); | |
1065 | goto out_unlock; | |
1066 | } | |
2619ba1f CM |
1067 | |
1068 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1069 | if (err) { | |
1070 | err = -ENOSPC; | |
1071 | goto out_unlock; | |
1072 | } | |
1073 | ||
31f3c99b CM |
1074 | inode = btrfs_new_inode(trans, root, objectid, |
1075 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
f7922033 CM |
1076 | if (IS_ERR(inode)) { |
1077 | err = PTR_ERR(inode); | |
1078 | goto out_fail; | |
1079 | } | |
1080 | drop_on_err = 1; | |
1081 | inode->i_op = &btrfs_dir_inode_operations; | |
1082 | inode->i_fop = &btrfs_dir_file_operations; | |
31f3c99b | 1083 | btrfs_set_trans_block_group(trans, inode); |
f7922033 | 1084 | |
2619ba1f CM |
1085 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
1086 | if (err) | |
1087 | goto out_fail; | |
1088 | ||
1089 | inode->i_size = 6; | |
1090 | err = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
1091 | if (err) |
1092 | goto out_fail; | |
1093 | err = btrfs_add_link(trans, dentry, inode); | |
1094 | if (err) | |
1095 | goto out_fail; | |
1096 | d_instantiate(dentry, inode); | |
f7922033 | 1097 | drop_on_err = 0; |
cd1bc465 | 1098 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
1099 | btrfs_update_inode_block_group(trans, inode); |
1100 | btrfs_update_inode_block_group(trans, dir); | |
f7922033 CM |
1101 | |
1102 | out_fail: | |
1103 | btrfs_end_transaction(trans, root); | |
1104 | out_unlock: | |
1105 | mutex_unlock(&root->fs_info->fs_mutex); | |
1106 | if (drop_on_err) | |
1107 | iput(inode); | |
35b7e476 | 1108 | btrfs_btree_balance_dirty(root); |
f7922033 CM |
1109 | return err; |
1110 | } | |
1111 | ||
8fd17795 CM |
1112 | static int btrfs_sync_file(struct file *file, |
1113 | struct dentry *dentry, int datasync) | |
1114 | { | |
1115 | struct inode *inode = dentry->d_inode; | |
1116 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1117 | int ret; | |
1118 | struct btrfs_trans_handle *trans; | |
1119 | ||
1120 | mutex_lock(&root->fs_info->fs_mutex); | |
1121 | trans = btrfs_start_transaction(root, 1); | |
1122 | if (!trans) { | |
1123 | ret = -ENOMEM; | |
1124 | goto out; | |
1125 | } | |
1126 | ret = btrfs_commit_transaction(trans, root); | |
1127 | mutex_unlock(&root->fs_info->fs_mutex); | |
1128 | out: | |
1129 | return ret > 0 ? EIO : ret; | |
1130 | } | |
1131 | ||
d5719762 CM |
1132 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
1133 | { | |
1134 | struct btrfs_trans_handle *trans; | |
1135 | struct btrfs_root *root; | |
1136 | int ret; | |
d98237b3 | 1137 | root = btrfs_sb(sb); |
df2ce34c | 1138 | |
d5719762 | 1139 | sb->s_dirt = 0; |
d561c025 | 1140 | if (!wait) { |
7cfcc17e | 1141 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
1142 | return 0; |
1143 | } | |
d561c025 | 1144 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
1145 | trans = btrfs_start_transaction(root, 1); |
1146 | ret = btrfs_commit_transaction(trans, root); | |
1147 | sb->s_dirt = 0; | |
1148 | BUG_ON(ret); | |
1149 | printk("btrfs sync_fs\n"); | |
d561c025 | 1150 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
1151 | return 0; |
1152 | } | |
1153 | ||
75dfe396 | 1154 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
1155 | struct buffer_head *result, int create) |
1156 | { | |
1157 | int ret; | |
1158 | int err = 0; | |
1159 | u64 blocknr; | |
1160 | u64 extent_start = 0; | |
1161 | u64 extent_end = 0; | |
1162 | u64 objectid = inode->i_ino; | |
236454df | 1163 | u32 found_type; |
5caf2a00 | 1164 | struct btrfs_path *path; |
d6e4a428 | 1165 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dee26a9f CM |
1166 | struct btrfs_file_extent_item *item; |
1167 | struct btrfs_leaf *leaf; | |
1168 | struct btrfs_disk_key *found_key; | |
1169 | ||
5caf2a00 CM |
1170 | path = btrfs_alloc_path(); |
1171 | BUG_ON(!path); | |
1172 | btrfs_init_path(path); | |
6567e837 | 1173 | if (create) { |
6567e837 CM |
1174 | WARN_ON(1); |
1175 | } | |
dee26a9f | 1176 | |
236454df | 1177 | ret = btrfs_lookup_file_extent(NULL, root, path, |
9773a788 | 1178 | inode->i_ino, |
236454df | 1179 | iblock << inode->i_blkbits, 0); |
dee26a9f | 1180 | if (ret < 0) { |
dee26a9f CM |
1181 | err = ret; |
1182 | goto out; | |
1183 | } | |
1184 | ||
1185 | if (ret != 0) { | |
5caf2a00 CM |
1186 | if (path->slots[0] == 0) { |
1187 | btrfs_release_path(root, path); | |
236454df | 1188 | goto out; |
dee26a9f | 1189 | } |
5caf2a00 | 1190 | path->slots[0]--; |
dee26a9f CM |
1191 | } |
1192 | ||
5caf2a00 | 1193 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 1194 | struct btrfs_file_extent_item); |
5caf2a00 | 1195 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
1196 | blocknr = btrfs_file_extent_disk_blocknr(item); |
1197 | blocknr += btrfs_file_extent_offset(item); | |
1198 | ||
dee26a9f | 1199 | /* are we inside the extent that was found? */ |
5caf2a00 | 1200 | found_key = &leaf->items[path->slots[0]].key; |
236454df | 1201 | found_type = btrfs_disk_key_type(found_key); |
dee26a9f | 1202 | if (btrfs_disk_key_objectid(found_key) != objectid || |
236454df | 1203 | found_type != BTRFS_EXTENT_DATA_KEY) { |
dee26a9f CM |
1204 | extent_end = 0; |
1205 | extent_start = 0; | |
dee26a9f CM |
1206 | goto out; |
1207 | } | |
236454df CM |
1208 | found_type = btrfs_file_extent_type(item); |
1209 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1210 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1211 | extent_start = extent_start >> inode->i_blkbits; | |
1212 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
3a686375 CM |
1213 | err = 0; |
1214 | if (blocknr == 0) | |
1215 | goto out; | |
236454df | 1216 | if (iblock >= extent_start && iblock < extent_end) { |
236454df CM |
1217 | btrfs_map_bh_to_logical(root, result, blocknr + |
1218 | iblock - extent_start); | |
1219 | goto out; | |
1220 | } | |
1221 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1222 | char *ptr; | |
1223 | char *map; | |
1224 | u32 size; | |
1225 | size = btrfs_file_extent_inline_len(leaf->items + | |
1226 | path->slots[0]); | |
1227 | extent_end = (extent_start + size) >> inode->i_blkbits; | |
1228 | extent_start >>= inode->i_blkbits; | |
1229 | if (iblock < extent_start || iblock > extent_end) { | |
1230 | goto out; | |
1231 | } | |
1232 | ptr = btrfs_file_extent_inline_start(item); | |
1233 | map = kmap(result->b_page); | |
1234 | memcpy(map, ptr, size); | |
1235 | memset(map + size, 0, PAGE_CACHE_SIZE - size); | |
1236 | flush_dcache_page(result->b_page); | |
1237 | kunmap(result->b_page); | |
1238 | set_buffer_uptodate(result); | |
1239 | SetPageChecked(result->b_page); | |
1240 | btrfs_map_bh_to_logical(root, result, 0); | |
dee26a9f | 1241 | } |
dee26a9f | 1242 | out: |
5caf2a00 | 1243 | btrfs_free_path(path); |
75dfe396 CM |
1244 | return err; |
1245 | } | |
1246 | ||
1247 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1248 | struct buffer_head *result, int create) | |
1249 | { | |
1250 | int err; | |
d6e4a428 | 1251 | struct btrfs_root *root = BTRFS_I(inode)->root; |
75dfe396 | 1252 | mutex_lock(&root->fs_info->fs_mutex); |
e8f05c45 | 1253 | err = btrfs_get_block_lock(inode, iblock, result, create); |
dee26a9f CM |
1254 | mutex_unlock(&root->fs_info->fs_mutex); |
1255 | return err; | |
1256 | } | |
1257 | ||
1258 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1259 | unsigned from, unsigned to) | |
1260 | { | |
6407bf6d | 1261 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f CM |
1262 | } |
1263 | ||
d561c025 CM |
1264 | static void btrfs_write_super(struct super_block *sb) |
1265 | { | |
1266 | btrfs_sync_fs(sb, 1); | |
1267 | } | |
1268 | ||
dee26a9f CM |
1269 | static int btrfs_readpage(struct file *file, struct page *page) |
1270 | { | |
1271 | return mpage_readpage(page, btrfs_get_block); | |
1272 | } | |
1273 | ||
236454df CM |
1274 | /* |
1275 | * While block_write_full_page is writing back the dirty buffers under | |
1276 | * the page lock, whoever dirtied the buffers may decide to clean them | |
1277 | * again at any time. We handle that by only looking at the buffer | |
1278 | * state inside lock_buffer(). | |
1279 | * | |
1280 | * If block_write_full_page() is called for regular writeback | |
1281 | * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a | |
1282 | * locked buffer. This only can happen if someone has written the buffer | |
1283 | * directly, with submit_bh(). At the address_space level PageWriteback | |
1284 | * prevents this contention from occurring. | |
1285 | */ | |
1286 | static int __btrfs_write_full_page(struct inode *inode, struct page *page, | |
1287 | struct writeback_control *wbc) | |
1288 | { | |
1289 | int err; | |
1290 | sector_t block; | |
1291 | sector_t last_block; | |
1292 | struct buffer_head *bh, *head; | |
1293 | const unsigned blocksize = 1 << inode->i_blkbits; | |
1294 | int nr_underway = 0; | |
1295 | ||
1296 | BUG_ON(!PageLocked(page)); | |
1297 | ||
1298 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; | |
1299 | ||
1300 | if (!page_has_buffers(page)) { | |
1301 | create_empty_buffers(page, blocksize, | |
1302 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
1303 | } | |
1304 | ||
1305 | /* | |
1306 | * Be very careful. We have no exclusion from __set_page_dirty_buffers | |
1307 | * here, and the (potentially unmapped) buffers may become dirty at | |
1308 | * any time. If a buffer becomes dirty here after we've inspected it | |
1309 | * then we just miss that fact, and the page stays dirty. | |
1310 | * | |
1311 | * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; | |
1312 | * handle that here by just cleaning them. | |
1313 | */ | |
1314 | ||
1315 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1316 | head = page_buffers(page); | |
1317 | bh = head; | |
1318 | ||
1319 | /* | |
1320 | * Get all the dirty buffers mapped to disk addresses and | |
1321 | * handle any aliases from the underlying blockdev's mapping. | |
1322 | */ | |
1323 | do { | |
1324 | if (block > last_block) { | |
1325 | /* | |
1326 | * mapped buffers outside i_size will occur, because | |
1327 | * this page can be outside i_size when there is a | |
1328 | * truncate in progress. | |
1329 | */ | |
1330 | /* | |
1331 | * The buffer was zeroed by block_write_full_page() | |
1332 | */ | |
1333 | clear_buffer_dirty(bh); | |
1334 | set_buffer_uptodate(bh); | |
1335 | } else if (!buffer_mapped(bh) && buffer_dirty(bh)) { | |
1336 | WARN_ON(bh->b_size != blocksize); | |
1337 | err = btrfs_get_block(inode, block, bh, 0); | |
35b7e476 CM |
1338 | if (err) { |
1339 | printk("writepage going to recovery err %d\n", err); | |
236454df | 1340 | goto recover; |
35b7e476 | 1341 | } |
236454df CM |
1342 | if (buffer_new(bh)) { |
1343 | /* blockdev mappings never come here */ | |
1344 | clear_buffer_new(bh); | |
236454df CM |
1345 | } |
1346 | } | |
1347 | bh = bh->b_this_page; | |
1348 | block++; | |
1349 | } while (bh != head); | |
1350 | ||
1351 | do { | |
1352 | if (!buffer_mapped(bh)) | |
1353 | continue; | |
1354 | /* | |
1355 | * If it's a fully non-blocking write attempt and we cannot | |
1356 | * lock the buffer then redirty the page. Note that this can | |
1357 | * potentially cause a busy-wait loop from pdflush and kswapd | |
1358 | * activity, but those code paths have their own higher-level | |
1359 | * throttling. | |
1360 | */ | |
1361 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
1362 | lock_buffer(bh); | |
1363 | } else if (test_set_buffer_locked(bh)) { | |
1364 | redirty_page_for_writepage(wbc, page); | |
1365 | continue; | |
1366 | } | |
1367 | if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) { | |
1368 | mark_buffer_async_write(bh); | |
1369 | } else { | |
1370 | unlock_buffer(bh); | |
1371 | } | |
1372 | } while ((bh = bh->b_this_page) != head); | |
1373 | ||
1374 | /* | |
1375 | * The page and its buffers are protected by PageWriteback(), so we can | |
1376 | * drop the bh refcounts early. | |
1377 | */ | |
1378 | BUG_ON(PageWriteback(page)); | |
1379 | set_page_writeback(page); | |
1380 | ||
1381 | do { | |
1382 | struct buffer_head *next = bh->b_this_page; | |
1383 | if (buffer_async_write(bh)) { | |
1384 | submit_bh(WRITE, bh); | |
1385 | nr_underway++; | |
1386 | } | |
1387 | bh = next; | |
1388 | } while (bh != head); | |
1389 | unlock_page(page); | |
1390 | ||
1391 | err = 0; | |
1392 | done: | |
1393 | if (nr_underway == 0) { | |
1394 | /* | |
1395 | * The page was marked dirty, but the buffers were | |
1396 | * clean. Someone wrote them back by hand with | |
1397 | * ll_rw_block/submit_bh. A rare case. | |
1398 | */ | |
1399 | int uptodate = 1; | |
1400 | do { | |
1401 | if (!buffer_uptodate(bh)) { | |
1402 | uptodate = 0; | |
1403 | break; | |
1404 | } | |
1405 | bh = bh->b_this_page; | |
1406 | } while (bh != head); | |
1407 | if (uptodate) | |
1408 | SetPageUptodate(page); | |
1409 | end_page_writeback(page); | |
236454df CM |
1410 | } |
1411 | return err; | |
1412 | ||
1413 | recover: | |
1414 | /* | |
1415 | * ENOSPC, or some other error. We may already have added some | |
1416 | * blocks to the file, so we need to write these out to avoid | |
1417 | * exposing stale data. | |
1418 | * The page is currently locked and not marked for writeback | |
1419 | */ | |
1420 | bh = head; | |
1421 | /* Recovery: lock and submit the mapped buffers */ | |
1422 | do { | |
1423 | if (buffer_mapped(bh) && buffer_dirty(bh)) { | |
1424 | lock_buffer(bh); | |
1425 | mark_buffer_async_write(bh); | |
1426 | } else { | |
1427 | /* | |
1428 | * The buffer may have been set dirty during | |
1429 | * attachment to a dirty page. | |
1430 | */ | |
1431 | clear_buffer_dirty(bh); | |
1432 | } | |
1433 | } while ((bh = bh->b_this_page) != head); | |
1434 | SetPageError(page); | |
1435 | BUG_ON(PageWriteback(page)); | |
1436 | set_page_writeback(page); | |
1437 | do { | |
1438 | struct buffer_head *next = bh->b_this_page; | |
1439 | if (buffer_async_write(bh)) { | |
1440 | clear_buffer_dirty(bh); | |
1441 | submit_bh(WRITE, bh); | |
1442 | nr_underway++; | |
1443 | } | |
1444 | bh = next; | |
1445 | } while (bh != head); | |
1446 | unlock_page(page); | |
1447 | goto done; | |
1448 | } | |
1449 | ||
1450 | /* | |
1451 | * The generic ->writepage function for buffer-backed address_spaces | |
1452 | */ | |
dee26a9f CM |
1453 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
1454 | { | |
236454df CM |
1455 | struct inode * const inode = page->mapping->host; |
1456 | loff_t i_size = i_size_read(inode); | |
1457 | const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
1458 | unsigned offset; | |
1459 | void *kaddr; | |
1460 | ||
1461 | /* Is the page fully inside i_size? */ | |
1462 | if (page->index < end_index) | |
1463 | return __btrfs_write_full_page(inode, page, wbc); | |
1464 | ||
1465 | /* Is the page fully outside i_size? (truncate in progress) */ | |
1466 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
1467 | if (page->index >= end_index+1 || !offset) { | |
1468 | /* | |
1469 | * The page may have dirty, unmapped buffers. For example, | |
1470 | * they may have been added in ext3_writepage(). Make them | |
1471 | * freeable here, so the page does not leak. | |
1472 | */ | |
1473 | block_invalidatepage(page, 0); | |
1474 | unlock_page(page); | |
1475 | return 0; /* don't care */ | |
1476 | } | |
1477 | ||
1478 | /* | |
1479 | * The page straddles i_size. It must be zeroed out on each and every | |
1480 | * writepage invokation because it may be mmapped. "A file is mapped | |
1481 | * in multiples of the page size. For a file that is not a multiple of | |
1482 | * the page size, the remaining memory is zeroed when mapped, and | |
1483 | * writes to that region are not written out to the file." | |
1484 | */ | |
1485 | kaddr = kmap_atomic(page, KM_USER0); | |
1486 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1487 | flush_dcache_page(page); | |
1488 | kunmap_atomic(kaddr, KM_USER0); | |
1489 | return __btrfs_write_full_page(inode, page, wbc); | |
dee26a9f | 1490 | } |
d561c025 | 1491 | |
f4b9aa8d CM |
1492 | static void btrfs_truncate(struct inode *inode) |
1493 | { | |
d6e4a428 | 1494 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
1495 | int ret; |
1496 | struct btrfs_trans_handle *trans; | |
1497 | ||
1498 | if (!S_ISREG(inode->i_mode)) | |
1499 | return; | |
1500 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1501 | return; | |
1502 | ||
e8f05c45 | 1503 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d CM |
1504 | |
1505 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1506 | mutex_lock(&root->fs_info->fs_mutex); | |
1507 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1508 | btrfs_set_trans_block_group(trans, inode); |
f4b9aa8d CM |
1509 | ret = btrfs_truncate_in_trans(trans, root, inode); |
1510 | BUG_ON(ret); | |
35b7e476 | 1511 | btrfs_update_inode(trans, root, inode); |
f4b9aa8d CM |
1512 | ret = btrfs_end_transaction(trans, root); |
1513 | BUG_ON(ret); | |
1514 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 1515 | btrfs_btree_balance_dirty(root); |
f4b9aa8d CM |
1516 | } |
1517 | ||
236454df CM |
1518 | /* |
1519 | * Make sure any changes to nobh_commit_write() are reflected in | |
1520 | * nobh_truncate_page(), since it doesn't call commit_write(). | |
1521 | */ | |
1522 | static int btrfs_commit_write(struct file *file, struct page *page, | |
1523 | unsigned from, unsigned to) | |
1524 | { | |
1525 | struct inode *inode = page->mapping->host; | |
1526 | struct buffer_head *bh; | |
1527 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1528 | ||
1529 | SetPageUptodate(page); | |
1530 | bh = page_buffers(page); | |
1531 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { | |
1532 | set_page_dirty(page); | |
1533 | } | |
1534 | if (pos > inode->i_size) { | |
1535 | i_size_write(inode, pos); | |
1536 | mark_inode_dirty(inode); | |
1537 | } | |
1538 | return 0; | |
1539 | } | |
1540 | ||
75dfe396 CM |
1541 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1542 | struct page **prepared_pages, | |
1543 | const char __user * buf) | |
1544 | { | |
1545 | long page_fault = 0; | |
1546 | int i; | |
1547 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1548 | ||
1549 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1550 | size_t count = min_t(size_t, | |
1551 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1552 | struct page *page = prepared_pages[i]; | |
1553 | fault_in_pages_readable(buf, count); | |
1554 | ||
1555 | /* Copy data from userspace to the current page */ | |
1556 | kmap(page); | |
1557 | page_fault = __copy_from_user(page_address(page) + offset, | |
1558 | buf, count); | |
1559 | /* Flush processor's dcache for this page */ | |
1560 | flush_dcache_page(page); | |
1561 | kunmap(page); | |
1562 | buf += count; | |
1563 | write_bytes -= count; | |
1564 | ||
1565 | if (page_fault) | |
1566 | break; | |
1567 | } | |
1568 | return page_fault ? -EFAULT : 0; | |
1569 | } | |
1570 | ||
1571 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1572 | { | |
1573 | size_t i; | |
1574 | for (i = 0; i < num_pages; i++) { | |
1575 | if (!pages[i]) | |
1576 | break; | |
1577 | unlock_page(pages[i]); | |
1578 | mark_page_accessed(pages[i]); | |
1579 | page_cache_release(pages[i]); | |
1580 | } | |
1581 | } | |
1582 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1583 | struct btrfs_root *root, | |
1584 | struct file *file, | |
1585 | struct page **pages, | |
1586 | size_t num_pages, | |
1587 | loff_t pos, | |
1588 | size_t write_bytes) | |
1589 | { | |
1590 | int i; | |
1591 | int offset; | |
1592 | int err = 0; | |
1593 | int ret; | |
1594 | int this_write; | |
f254e52c | 1595 | struct inode *inode = file->f_path.dentry->d_inode; |
236454df CM |
1596 | struct buffer_head *bh; |
1597 | struct btrfs_file_extent_item *ei; | |
75dfe396 CM |
1598 | |
1599 | for (i = 0; i < num_pages; i++) { | |
1600 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1601 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1602 | /* FIXME, one block at a time */ |
1603 | ||
1604 | mutex_lock(&root->fs_info->fs_mutex); | |
1605 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1606 | btrfs_set_trans_block_group(trans, inode); |
236454df CM |
1607 | |
1608 | bh = page_buffers(pages[i]); | |
1609 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
1610 | struct btrfs_key key; | |
1611 | struct btrfs_path *path; | |
1612 | char *ptr; | |
1613 | u32 datasize; | |
1614 | ||
1615 | path = btrfs_alloc_path(); | |
1616 | BUG_ON(!path); | |
1617 | key.objectid = inode->i_ino; | |
1618 | key.offset = pages[i]->index << PAGE_CACHE_SHIFT; | |
1619 | key.flags = 0; | |
1620 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
1621 | BUG_ON(write_bytes >= PAGE_CACHE_SIZE); | |
1622 | datasize = offset + | |
1623 | btrfs_file_extent_calc_inline_size(write_bytes); | |
1624 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1625 | datasize); | |
1626 | BUG_ON(ret); | |
1627 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1628 | path->slots[0], struct btrfs_file_extent_item); | |
1629 | btrfs_set_file_extent_generation(ei, trans->transid); | |
1630 | btrfs_set_file_extent_type(ei, | |
1631 | BTRFS_FILE_EXTENT_INLINE); | |
1632 | ptr = btrfs_file_extent_inline_start(ei); | |
098f59c2 CM |
1633 | btrfs_memcpy(root, path->nodes[0]->b_data, |
1634 | ptr, bh->b_data, offset + write_bytes); | |
236454df CM |
1635 | mark_buffer_dirty(path->nodes[0]); |
1636 | btrfs_free_path(path); | |
3a686375 | 1637 | } else if (buffer_mapped(bh)) { |
236454df | 1638 | btrfs_csum_file_block(trans, root, inode->i_ino, |
f254e52c CM |
1639 | pages[i]->index << PAGE_CACHE_SHIFT, |
1640 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
236454df CM |
1641 | kunmap(pages[i]); |
1642 | } | |
f254e52c | 1643 | SetPageChecked(pages[i]); |
e37c9e69 | 1644 | // btrfs_update_inode_block_group(trans, inode); |
f254e52c CM |
1645 | ret = btrfs_end_transaction(trans, root); |
1646 | BUG_ON(ret); | |
1647 | mutex_unlock(&root->fs_info->fs_mutex); | |
1648 | ||
236454df | 1649 | ret = btrfs_commit_write(file, pages[i], offset, |
75dfe396 CM |
1650 | offset + this_write); |
1651 | pos += this_write; | |
1652 | if (ret) { | |
1653 | err = ret; | |
1654 | goto failed; | |
1655 | } | |
1656 | WARN_ON(this_write > write_bytes); | |
1657 | write_bytes -= this_write; | |
1658 | } | |
1659 | failed: | |
1660 | return err; | |
1661 | } | |
1662 | ||
b18c6685 CM |
1663 | static int drop_extents(struct btrfs_trans_handle *trans, |
1664 | struct btrfs_root *root, | |
1665 | struct inode *inode, | |
de428b63 | 1666 | u64 start, u64 end, u64 *hint_block) |
b18c6685 CM |
1667 | { |
1668 | int ret; | |
1669 | struct btrfs_key key; | |
1670 | struct btrfs_leaf *leaf; | |
1671 | int slot; | |
1672 | struct btrfs_file_extent_item *extent; | |
236454df | 1673 | u64 extent_end = 0; |
b18c6685 CM |
1674 | int keep; |
1675 | struct btrfs_file_extent_item old; | |
1676 | struct btrfs_path *path; | |
1677 | u64 search_start = start; | |
1678 | int bookend; | |
236454df CM |
1679 | int found_type; |
1680 | int found_extent; | |
1681 | int found_inline; | |
1682 | ||
b18c6685 CM |
1683 | path = btrfs_alloc_path(); |
1684 | if (!path) | |
1685 | return -ENOMEM; | |
a429e513 CM |
1686 | while(1) { |
1687 | btrfs_release_path(root, path); | |
1688 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
1689 | search_start, -1); | |
1690 | if (ret < 0) | |
70b2befd | 1691 | goto out; |
a429e513 CM |
1692 | if (ret > 0) { |
1693 | if (path->slots[0] == 0) { | |
236454df | 1694 | ret = 0; |
a429e513 CM |
1695 | goto out; |
1696 | } | |
1697 | path->slots[0]--; | |
70b2befd | 1698 | } |
b18c6685 CM |
1699 | keep = 0; |
1700 | bookend = 0; | |
236454df CM |
1701 | found_extent = 0; |
1702 | found_inline = 0; | |
1703 | extent = NULL; | |
b18c6685 CM |
1704 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
1705 | slot = path->slots[0]; | |
1706 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
b18c6685 CM |
1707 | if (key.offset >= end || key.objectid != inode->i_ino) { |
1708 | ret = 0; | |
1709 | goto out; | |
1710 | } | |
236454df CM |
1711 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) { |
1712 | ret = 0; | |
1713 | goto out; | |
1714 | } | |
1715 | extent = btrfs_item_ptr(leaf, slot, | |
1716 | struct btrfs_file_extent_item); | |
1717 | found_type = btrfs_file_extent_type(extent); | |
1718 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1719 | extent_end = key.offset + | |
1720 | (btrfs_file_extent_num_blocks(extent) << | |
1721 | inode->i_blkbits); | |
1722 | found_extent = 1; | |
1723 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1724 | found_inline = 1; | |
1725 | extent_end = key.offset + | |
1726 | btrfs_file_extent_inline_len(leaf->items + slot); | |
1727 | } | |
1728 | ||
1729 | if (!found_extent && !found_inline) { | |
1730 | ret = 0; | |
a429e513 | 1731 | goto out; |
236454df CM |
1732 | } |
1733 | ||
1734 | if (search_start >= extent_end) { | |
1735 | ret = 0; | |
a429e513 | 1736 | goto out; |
236454df CM |
1737 | } |
1738 | ||
3a686375 CM |
1739 | if (found_inline) { |
1740 | u64 mask = root->blocksize - 1; | |
1741 | search_start = (extent_end + mask) & ~mask; | |
1742 | } else | |
1743 | search_start = extent_end; | |
b18c6685 CM |
1744 | |
1745 | if (end < extent_end && end >= key.offset) { | |
236454df | 1746 | if (found_extent) { |
3a686375 CM |
1747 | u64 disk_blocknr = |
1748 | btrfs_file_extent_disk_blocknr(extent); | |
1749 | u64 disk_num_blocks = | |
1750 | btrfs_file_extent_disk_num_blocks(extent); | |
236454df | 1751 | memcpy(&old, extent, sizeof(old)); |
3a686375 CM |
1752 | if (disk_blocknr != 0) { |
1753 | ret = btrfs_inc_extent_ref(trans, root, | |
1754 | disk_blocknr, disk_num_blocks); | |
1755 | BUG_ON(ret); | |
1756 | } | |
236454df CM |
1757 | } |
1758 | WARN_ON(found_inline); | |
b18c6685 CM |
1759 | bookend = 1; |
1760 | } | |
1761 | ||
1762 | if (start > key.offset) { | |
1763 | u64 new_num; | |
a429e513 | 1764 | u64 old_num; |
b18c6685 CM |
1765 | /* truncate existing extent */ |
1766 | keep = 1; | |
1767 | WARN_ON(start & (root->blocksize - 1)); | |
236454df CM |
1768 | if (found_extent) { |
1769 | new_num = (start - key.offset) >> | |
1770 | inode->i_blkbits; | |
1771 | old_num = btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1772 | *hint_block = |
1773 | btrfs_file_extent_disk_blocknr(extent); | |
3a686375 CM |
1774 | if (btrfs_file_extent_disk_blocknr(extent)) { |
1775 | inode->i_blocks -= | |
1776 | (old_num - new_num) << 3; | |
1777 | } | |
236454df CM |
1778 | btrfs_set_file_extent_num_blocks(extent, |
1779 | new_num); | |
1780 | mark_buffer_dirty(path->nodes[0]); | |
1781 | } else { | |
1782 | WARN_ON(1); | |
236454df | 1783 | } |
b18c6685 CM |
1784 | } |
1785 | if (!keep) { | |
236454df CM |
1786 | u64 disk_blocknr = 0; |
1787 | u64 disk_num_blocks = 0; | |
1788 | u64 extent_num_blocks = 0; | |
1789 | if (found_extent) { | |
1790 | disk_blocknr = | |
1791 | btrfs_file_extent_disk_blocknr(extent); | |
1792 | disk_num_blocks = | |
1793 | btrfs_file_extent_disk_num_blocks(extent); | |
1794 | extent_num_blocks = | |
1795 | btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1796 | *hint_block = |
1797 | btrfs_file_extent_disk_blocknr(extent); | |
236454df | 1798 | } |
b18c6685 CM |
1799 | ret = btrfs_del_item(trans, root, path); |
1800 | BUG_ON(ret); | |
1801 | btrfs_release_path(root, path); | |
098f59c2 | 1802 | extent = NULL; |
3a686375 | 1803 | if (found_extent && disk_blocknr != 0) { |
098f59c2 | 1804 | inode->i_blocks -= extent_num_blocks << 3; |
236454df CM |
1805 | ret = btrfs_free_extent(trans, root, |
1806 | disk_blocknr, | |
1807 | disk_num_blocks, 0); | |
1808 | } | |
b18c6685 CM |
1809 | |
1810 | BUG_ON(ret); | |
1811 | if (!bookend && search_start >= end) { | |
1812 | ret = 0; | |
1813 | goto out; | |
1814 | } | |
1815 | if (!bookend) | |
a429e513 | 1816 | continue; |
b18c6685 | 1817 | } |
236454df | 1818 | if (bookend && found_extent) { |
b18c6685 CM |
1819 | /* create bookend */ |
1820 | struct btrfs_key ins; | |
b18c6685 CM |
1821 | ins.objectid = inode->i_ino; |
1822 | ins.offset = end; | |
1823 | ins.flags = 0; | |
1824 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); | |
1825 | ||
1826 | btrfs_release_path(root, path); | |
b18c6685 CM |
1827 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
1828 | sizeof(*extent)); | |
1829 | BUG_ON(ret); | |
1830 | extent = btrfs_item_ptr( | |
1831 | btrfs_buffer_leaf(path->nodes[0]), | |
1832 | path->slots[0], | |
1833 | struct btrfs_file_extent_item); | |
1834 | btrfs_set_file_extent_disk_blocknr(extent, | |
1835 | btrfs_file_extent_disk_blocknr(&old)); | |
1836 | btrfs_set_file_extent_disk_num_blocks(extent, | |
1837 | btrfs_file_extent_disk_num_blocks(&old)); | |
1838 | ||
1839 | btrfs_set_file_extent_offset(extent, | |
1840 | btrfs_file_extent_offset(&old) + | |
1841 | ((end - key.offset) >> inode->i_blkbits)); | |
1842 | WARN_ON(btrfs_file_extent_num_blocks(&old) < | |
3a686375 | 1843 | (extent_end - end) >> inode->i_blkbits); |
b18c6685 | 1844 | btrfs_set_file_extent_num_blocks(extent, |
3a686375 | 1845 | (extent_end - end) >> inode->i_blkbits); |
b18c6685 | 1846 | |
236454df CM |
1847 | btrfs_set_file_extent_type(extent, |
1848 | BTRFS_FILE_EXTENT_REG); | |
b18c6685 CM |
1849 | btrfs_set_file_extent_generation(extent, |
1850 | btrfs_file_extent_generation(&old)); | |
b18c6685 | 1851 | btrfs_mark_buffer_dirty(path->nodes[0]); |
3a686375 CM |
1852 | if (btrfs_file_extent_disk_blocknr(&old) != 0) { |
1853 | inode->i_blocks += | |
1854 | btrfs_file_extent_num_blocks(extent) << 3; | |
1855 | } | |
b18c6685 | 1856 | ret = 0; |
70b2befd | 1857 | goto out; |
b18c6685 | 1858 | } |
b18c6685 | 1859 | } |
b18c6685 | 1860 | out: |
b18c6685 CM |
1861 | btrfs_free_path(path); |
1862 | return ret; | |
1863 | } | |
1864 | ||
1865 | static int prepare_pages(struct btrfs_root *root, | |
75dfe396 CM |
1866 | struct file *file, |
1867 | struct page **pages, | |
1868 | size_t num_pages, | |
1869 | loff_t pos, | |
2932f3ec CM |
1870 | unsigned long first_index, |
1871 | unsigned long last_index, | |
6567e837 CM |
1872 | size_t write_bytes, |
1873 | u64 alloc_extent_start) | |
75dfe396 CM |
1874 | { |
1875 | int i; | |
1876 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
1877 | struct inode *inode = file->f_path.dentry->d_inode; | |
1878 | int offset; | |
1879 | int err = 0; | |
75dfe396 | 1880 | int this_write; |
6567e837 CM |
1881 | struct buffer_head *bh; |
1882 | struct buffer_head *head; | |
75dfe396 CM |
1883 | loff_t isize = i_size_read(inode); |
1884 | ||
1885 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
1886 | ||
1887 | for (i = 0; i < num_pages; i++) { | |
1888 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
1889 | if (!pages[i]) { | |
1890 | err = -ENOMEM; | |
1891 | goto failed_release; | |
1892 | } | |
35b7e476 CM |
1893 | cancel_dirty_page(pages[i], PAGE_CACHE_SIZE); |
1894 | wait_on_page_writeback(pages[i]); | |
75dfe396 CM |
1895 | offset = pos & (PAGE_CACHE_SIZE -1); |
1896 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
35b7e476 CM |
1897 | if (!page_has_buffers(pages[i])) { |
1898 | create_empty_buffers(pages[i], | |
1899 | root->fs_info->sb->s_blocksize, | |
1900 | (1 << BH_Uptodate)); | |
1901 | } | |
6567e837 CM |
1902 | head = page_buffers(pages[i]); |
1903 | bh = head; | |
1904 | do { | |
1905 | err = btrfs_map_bh_to_logical(root, bh, | |
1906 | alloc_extent_start); | |
1907 | BUG_ON(err); | |
1908 | if (err) | |
1909 | goto failed_truncate; | |
1910 | bh = bh->b_this_page; | |
236454df CM |
1911 | if (alloc_extent_start) |
1912 | alloc_extent_start++; | |
6567e837 | 1913 | } while (bh != head); |
75dfe396 | 1914 | pos += this_write; |
75dfe396 CM |
1915 | WARN_ON(this_write > write_bytes); |
1916 | write_bytes -= this_write; | |
1917 | } | |
1918 | return 0; | |
1919 | ||
1920 | failed_release: | |
1921 | btrfs_drop_pages(pages, num_pages); | |
1922 | return err; | |
1923 | ||
1924 | failed_truncate: | |
1925 | btrfs_drop_pages(pages, num_pages); | |
1926 | if (pos > isize) | |
1927 | vmtruncate(inode, isize); | |
1928 | return err; | |
1929 | } | |
1930 | ||
1931 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
1932 | size_t count, loff_t *ppos) | |
1933 | { | |
1934 | loff_t pos; | |
1935 | size_t num_written = 0; | |
1936 | int err = 0; | |
1937 | int ret = 0; | |
75dfe396 | 1938 | struct inode *inode = file->f_path.dentry->d_inode; |
d6e4a428 | 1939 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b18c6685 | 1940 | struct page *pages[8]; |
35b7e476 | 1941 | struct page *pinned[2]; |
2932f3ec CM |
1942 | unsigned long first_index; |
1943 | unsigned long last_index; | |
6567e837 CM |
1944 | u64 start_pos; |
1945 | u64 num_blocks; | |
1946 | u64 alloc_extent_start; | |
de428b63 | 1947 | u64 hint_block; |
6567e837 | 1948 | struct btrfs_trans_handle *trans; |
b18c6685 | 1949 | struct btrfs_key ins; |
35b7e476 CM |
1950 | pinned[0] = NULL; |
1951 | pinned[1] = NULL; | |
75dfe396 CM |
1952 | if (file->f_flags & O_DIRECT) |
1953 | return -EINVAL; | |
1954 | pos = *ppos; | |
75dfe396 CM |
1955 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
1956 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1957 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1958 | if (err) | |
1959 | goto out; | |
1960 | if (count == 0) | |
1961 | goto out; | |
1962 | err = remove_suid(file->f_path.dentry); | |
1963 | if (err) | |
1964 | goto out; | |
1965 | file_update_time(file); | |
a429e513 CM |
1966 | |
1967 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); | |
1968 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> | |
1969 | inode->i_blkbits; | |
1970 | ||
75dfe396 | 1971 | mutex_lock(&inode->i_mutex); |
2932f3ec CM |
1972 | first_index = pos >> PAGE_CACHE_SHIFT; |
1973 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
6567e837 | 1974 | |
a429e513 CM |
1975 | if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size && |
1976 | (pos & (PAGE_CACHE_SIZE - 1))) { | |
1977 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); | |
1978 | if (!PageUptodate(pinned[0])) { | |
1979 | ret = mpage_readpage(pinned[0], btrfs_get_block); | |
1980 | BUG_ON(ret); | |
35b7e476 | 1981 | wait_on_page_locked(pinned[0]); |
a429e513 CM |
1982 | } else { |
1983 | unlock_page(pinned[0]); | |
1984 | } | |
1985 | } | |
1986 | if (first_index != last_index && | |
1987 | (last_index << PAGE_CACHE_SHIFT) < inode->i_size && | |
de428b63 | 1988 | pos + count < inode->i_size && |
a429e513 CM |
1989 | (count & (PAGE_CACHE_SIZE - 1))) { |
1990 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); | |
1991 | if (!PageUptodate(pinned[1])) { | |
1992 | ret = mpage_readpage(pinned[1], btrfs_get_block); | |
1993 | BUG_ON(ret); | |
35b7e476 | 1994 | wait_on_page_locked(pinned[1]); |
a429e513 CM |
1995 | } else { |
1996 | unlock_page(pinned[1]); | |
1997 | } | |
1998 | } | |
1999 | ||
6567e837 CM |
2000 | mutex_lock(&root->fs_info->fs_mutex); |
2001 | trans = btrfs_start_transaction(root, 1); | |
2002 | if (!trans) { | |
2003 | err = -ENOMEM; | |
b18c6685 | 2004 | mutex_unlock(&root->fs_info->fs_mutex); |
6567e837 CM |
2005 | goto out_unlock; |
2006 | } | |
31f3c99b | 2007 | btrfs_set_trans_block_group(trans, inode); |
a429e513 CM |
2008 | /* FIXME blocksize != 4096 */ |
2009 | inode->i_blocks += num_blocks << 3; | |
de428b63 | 2010 | hint_block = 0; |
b18c6685 | 2011 | if (start_pos < inode->i_size) { |
a429e513 | 2012 | /* FIXME blocksize != pagesize */ |
b18c6685 CM |
2013 | ret = drop_extents(trans, root, inode, |
2014 | start_pos, | |
2015 | (pos + count + root->blocksize -1) & | |
de428b63 | 2016 | ~((u64)root->blocksize - 1), &hint_block); |
236454df | 2017 | BUG_ON(ret); |
b18c6685 | 2018 | } |
3a686375 CM |
2019 | if (inode->i_size < start_pos) { |
2020 | u64 last_pos_in_file; | |
2021 | u64 hole_size; | |
2022 | u64 mask = root->blocksize - 1; | |
2023 | last_pos_in_file = (inode->i_size + mask) & ~mask; | |
2024 | hole_size = (start_pos - last_pos_in_file + mask) & ~mask; | |
2025 | hole_size >>= inode->i_blkbits; | |
2026 | if (last_pos_in_file < start_pos) { | |
2027 | ret = btrfs_insert_file_extent(trans, root, | |
2028 | inode->i_ino, | |
2029 | last_pos_in_file, | |
2030 | 0, 0, hole_size); | |
2031 | } | |
2032 | BUG_ON(ret); | |
2033 | } | |
236454df CM |
2034 | if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size || |
2035 | pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) { | |
4d775673 | 2036 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, |
de428b63 CM |
2037 | num_blocks, hint_block, (u64)-1, |
2038 | &ins, 1); | |
236454df CM |
2039 | BUG_ON(ret); |
2040 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
3a686375 CM |
2041 | start_pos, ins.objectid, ins.offset, |
2042 | ins.offset); | |
236454df CM |
2043 | BUG_ON(ret); |
2044 | } else { | |
2045 | ins.offset = 0; | |
2046 | ins.objectid = 0; | |
2047 | } | |
6567e837 | 2048 | BUG_ON(ret); |
b18c6685 | 2049 | alloc_extent_start = ins.objectid; |
e37c9e69 | 2050 | // btrfs_update_inode_block_group(trans, inode); |
b18c6685 | 2051 | ret = btrfs_end_transaction(trans, root); |
6567e837 CM |
2052 | mutex_unlock(&root->fs_info->fs_mutex); |
2053 | ||
75dfe396 CM |
2054 | while(count > 0) { |
2055 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
2056 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
2057 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
2058 | PAGE_CACHE_SHIFT; | |
b18c6685 CM |
2059 | |
2060 | memset(pages, 0, sizeof(pages)); | |
2061 | ret = prepare_pages(root, file, pages, num_pages, | |
6567e837 CM |
2062 | pos, first_index, last_index, |
2063 | write_bytes, alloc_extent_start); | |
75dfe396 | 2064 | BUG_ON(ret); |
b18c6685 | 2065 | |
6567e837 | 2066 | /* FIXME blocks != pagesize */ |
236454df CM |
2067 | if (alloc_extent_start) |
2068 | alloc_extent_start += num_pages; | |
75dfe396 CM |
2069 | ret = btrfs_copy_from_user(pos, num_pages, |
2070 | write_bytes, pages, buf); | |
2071 | BUG_ON(ret); | |
2072 | ||
f254e52c | 2073 | ret = dirty_and_release_pages(NULL, root, file, pages, |
70b2befd | 2074 | num_pages, pos, write_bytes); |
75dfe396 CM |
2075 | BUG_ON(ret); |
2076 | btrfs_drop_pages(pages, num_pages); | |
2077 | ||
75dfe396 CM |
2078 | buf += write_bytes; |
2079 | count -= write_bytes; | |
2080 | pos += write_bytes; | |
2081 | num_written += write_bytes; | |
2082 | ||
2083 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
35b7e476 | 2084 | btrfs_btree_balance_dirty(root); |
75dfe396 CM |
2085 | cond_resched(); |
2086 | } | |
6567e837 | 2087 | out_unlock: |
75dfe396 CM |
2088 | mutex_unlock(&inode->i_mutex); |
2089 | out: | |
a429e513 CM |
2090 | if (pinned[0]) |
2091 | page_cache_release(pinned[0]); | |
2092 | if (pinned[1]) | |
2093 | page_cache_release(pinned[1]); | |
75dfe396 CM |
2094 | *ppos = pos; |
2095 | current->backing_dev_info = NULL; | |
a429e513 | 2096 | mark_inode_dirty(inode); |
75dfe396 CM |
2097 | return num_written ? num_written : err; |
2098 | } | |
2099 | ||
f254e52c CM |
2100 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
2101 | unsigned long offset, unsigned long size) | |
2102 | { | |
2103 | char *kaddr; | |
2104 | unsigned long left, count = desc->count; | |
d6e4a428 | 2105 | struct inode *inode = page->mapping->host; |
f254e52c CM |
2106 | |
2107 | if (size > count) | |
2108 | size = count; | |
2109 | ||
2110 | if (!PageChecked(page)) { | |
2111 | /* FIXME, do it per block */ | |
d6e4a428 | 2112 | struct btrfs_root *root = BTRFS_I(inode)->root; |
236454df | 2113 | |
f254e52c | 2114 | int ret = btrfs_csum_verify_file_block(root, |
236454df CM |
2115 | page->mapping->host->i_ino, |
2116 | page->index << PAGE_CACHE_SHIFT, | |
2117 | kmap(page), PAGE_CACHE_SIZE); | |
f254e52c | 2118 | if (ret) { |
3a686375 CM |
2119 | if (ret != -ENOENT) { |
2120 | printk("failed to verify ino %lu page %lu\n", | |
2121 | page->mapping->host->i_ino, | |
2122 | page->index); | |
2123 | memset(page_address(page), 0, PAGE_CACHE_SIZE); | |
2124 | flush_dcache_page(page); | |
2125 | } | |
f254e52c CM |
2126 | } |
2127 | SetPageChecked(page); | |
2128 | kunmap(page); | |
2129 | } | |
2130 | /* | |
2131 | * Faults on the destination of a read are common, so do it before | |
2132 | * taking the kmap. | |
2133 | */ | |
2134 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
2135 | kaddr = kmap_atomic(page, KM_USER0); | |
2136 | left = __copy_to_user_inatomic(desc->arg.buf, | |
2137 | kaddr + offset, size); | |
2138 | kunmap_atomic(kaddr, KM_USER0); | |
2139 | if (left == 0) | |
2140 | goto success; | |
2141 | } | |
2142 | ||
2143 | /* Do it the slow way */ | |
2144 | kaddr = kmap(page); | |
2145 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
2146 | kunmap(page); | |
2147 | ||
2148 | if (left) { | |
2149 | size -= left; | |
2150 | desc->error = -EFAULT; | |
2151 | } | |
2152 | success: | |
2153 | desc->count = count - size; | |
2154 | desc->written += size; | |
2155 | desc->arg.buf += size; | |
2156 | return size; | |
2157 | } | |
2158 | ||
2159 | /** | |
2160 | * btrfs_file_aio_read - filesystem read routine | |
2161 | * @iocb: kernel I/O control block | |
2162 | * @iov: io vector request | |
2163 | * @nr_segs: number of segments in the iovec | |
2164 | * @pos: current file position | |
2165 | */ | |
2166 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
2167 | unsigned long nr_segs, loff_t pos) | |
2168 | { | |
2169 | struct file *filp = iocb->ki_filp; | |
2170 | ssize_t retval; | |
2171 | unsigned long seg; | |
2172 | size_t count; | |
2173 | loff_t *ppos = &iocb->ki_pos; | |
2174 | ||
2175 | count = 0; | |
2176 | for (seg = 0; seg < nr_segs; seg++) { | |
2177 | const struct iovec *iv = &iov[seg]; | |
2178 | ||
2179 | /* | |
2180 | * If any segment has a negative length, or the cumulative | |
2181 | * length ever wraps negative then return -EINVAL. | |
2182 | */ | |
2183 | count += iv->iov_len; | |
2184 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
2185 | return -EINVAL; | |
2186 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
2187 | continue; | |
2188 | if (seg == 0) | |
2189 | return -EFAULT; | |
2190 | nr_segs = seg; | |
2191 | count -= iv->iov_len; /* This segment is no good */ | |
2192 | break; | |
2193 | } | |
2194 | retval = 0; | |
2195 | if (count) { | |
2196 | for (seg = 0; seg < nr_segs; seg++) { | |
2197 | read_descriptor_t desc; | |
2198 | ||
2199 | desc.written = 0; | |
2200 | desc.arg.buf = iov[seg].iov_base; | |
2201 | desc.count = iov[seg].iov_len; | |
2202 | if (desc.count == 0) | |
2203 | continue; | |
2204 | desc.error = 0; | |
2205 | do_generic_file_read(filp, ppos, &desc, | |
2206 | btrfs_read_actor); | |
2207 | retval += desc.written; | |
2208 | if (desc.error) { | |
2209 | retval = retval ?: desc.error; | |
2210 | break; | |
2211 | } | |
2212 | } | |
2213 | } | |
2214 | return retval; | |
2215 | } | |
2216 | ||
2619ba1f CM |
2217 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
2218 | { | |
2219 | struct btrfs_trans_handle *trans; | |
2220 | struct btrfs_key key; | |
2221 | struct btrfs_root_item root_item; | |
2222 | struct btrfs_inode_item *inode_item; | |
2223 | struct buffer_head *subvol; | |
2224 | struct btrfs_leaf *leaf; | |
2225 | struct btrfs_root *new_root; | |
2226 | struct inode *inode; | |
31f3c99b | 2227 | struct inode *dir; |
2619ba1f CM |
2228 | int ret; |
2229 | u64 objectid; | |
2230 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
2231 | ||
2232 | mutex_lock(&root->fs_info->fs_mutex); | |
2233 | trans = btrfs_start_transaction(root, 1); | |
2234 | BUG_ON(!trans); | |
2235 | ||
31f3c99b | 2236 | subvol = btrfs_alloc_free_block(trans, root, 0); |
5e82849e CM |
2237 | if (subvol == NULL) |
2238 | return -ENOSPC; | |
2619ba1f CM |
2239 | leaf = btrfs_buffer_leaf(subvol); |
2240 | btrfs_set_header_nritems(&leaf->header, 0); | |
2241 | btrfs_set_header_level(&leaf->header, 0); | |
7eccb903 | 2242 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
2619ba1f | 2243 | btrfs_set_header_generation(&leaf->header, trans->transid); |
4d775673 | 2244 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); |
2619ba1f CM |
2245 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, |
2246 | sizeof(leaf->header.fsid)); | |
4d775673 | 2247 | mark_buffer_dirty(subvol); |
2619ba1f CM |
2248 | |
2249 | inode_item = &root_item.inode; | |
2250 | memset(inode_item, 0, sizeof(*inode_item)); | |
2251 | btrfs_set_inode_generation(inode_item, 1); | |
2252 | btrfs_set_inode_size(inode_item, 3); | |
2253 | btrfs_set_inode_nlink(inode_item, 1); | |
2254 | btrfs_set_inode_nblocks(inode_item, 1); | |
2255 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
2256 | ||
7eccb903 | 2257 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
2619ba1f | 2258 | btrfs_set_root_refs(&root_item, 1); |
5e82849e CM |
2259 | brelse(subvol); |
2260 | subvol = NULL; | |
2619ba1f | 2261 | |
2619ba1f CM |
2262 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2263 | 0, &objectid); | |
2264 | BUG_ON(ret); | |
2265 | ||
2266 | btrfs_set_root_dirid(&root_item, new_dirid); | |
2267 | ||
2268 | key.objectid = objectid; | |
2269 | key.offset = 1; | |
2270 | key.flags = 0; | |
2271 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
2272 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2273 | &root_item); | |
2274 | BUG_ON(ret); | |
2275 | ||
2276 | /* | |
2277 | * insert the directory item | |
2278 | */ | |
2279 | key.offset = (u64)-1; | |
31f3c99b | 2280 | dir = root->fs_info->sb->s_root->d_inode; |
2619ba1f | 2281 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
31f3c99b | 2282 | name, namelen, dir->i_ino, &key, 0); |
2619ba1f CM |
2283 | BUG_ON(ret); |
2284 | ||
2285 | ret = btrfs_commit_transaction(trans, root); | |
2286 | BUG_ON(ret); | |
2287 | ||
2288 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
2289 | BUG_ON(!new_root); | |
2290 | ||
2291 | trans = btrfs_start_transaction(new_root, 1); | |
2292 | BUG_ON(!trans); | |
2293 | ||
31f3c99b CM |
2294 | inode = btrfs_new_inode(trans, new_root, new_dirid, |
2295 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
2619ba1f CM |
2296 | inode->i_op = &btrfs_dir_inode_operations; |
2297 | inode->i_fop = &btrfs_dir_file_operations; | |
2298 | ||
2299 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
2300 | BUG_ON(ret); | |
2301 | ||
2302 | inode->i_nlink = 1; | |
2303 | inode->i_size = 6; | |
2304 | ret = btrfs_update_inode(trans, new_root, inode); | |
2305 | BUG_ON(ret); | |
2306 | ||
2307 | ret = btrfs_commit_transaction(trans, new_root); | |
2308 | BUG_ON(ret); | |
2309 | ||
2310 | iput(inode); | |
2311 | ||
2312 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2313 | btrfs_btree_balance_dirty(root); |
2619ba1f CM |
2314 | return 0; |
2315 | } | |
2316 | ||
c5739bba CM |
2317 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
2318 | { | |
2319 | struct btrfs_trans_handle *trans; | |
2320 | struct btrfs_key key; | |
2321 | struct btrfs_root_item new_root_item; | |
2322 | int ret; | |
2323 | u64 objectid; | |
2324 | ||
2619ba1f CM |
2325 | if (!root->ref_cows) |
2326 | return -EINVAL; | |
2327 | ||
c5739bba CM |
2328 | mutex_lock(&root->fs_info->fs_mutex); |
2329 | trans = btrfs_start_transaction(root, 1); | |
2330 | BUG_ON(!trans); | |
2331 | ||
2332 | ret = btrfs_update_inode(trans, root, root->inode); | |
2333 | BUG_ON(ret); | |
2334 | ||
1b05da2e CM |
2335 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2336 | 0, &objectid); | |
c5739bba CM |
2337 | BUG_ON(ret); |
2338 | ||
c5739bba CM |
2339 | memcpy(&new_root_item, &root->root_item, |
2340 | sizeof(new_root_item)); | |
2341 | ||
c5739bba CM |
2342 | key.objectid = objectid; |
2343 | key.offset = 1; | |
2344 | key.flags = 0; | |
2345 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
7eccb903 | 2346 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
c5739bba CM |
2347 | |
2348 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2349 | &new_root_item); | |
2350 | BUG_ON(ret); | |
2351 | ||
c5739bba CM |
2352 | /* |
2353 | * insert the directory item | |
2354 | */ | |
2355 | key.offset = (u64)-1; | |
2356 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2357 | name, namelen, | |
2358 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2359 | &key, 0); | |
2360 | ||
2361 | BUG_ON(ret); | |
2362 | ||
2363 | ret = btrfs_inc_root_ref(trans, root); | |
2364 | BUG_ON(ret); | |
2365 | ||
2366 | ret = btrfs_commit_transaction(trans, root); | |
2367 | BUG_ON(ret); | |
2368 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2369 | btrfs_btree_balance_dirty(root); |
c5739bba CM |
2370 | return 0; |
2371 | } | |
2372 | ||
8352d8a4 CM |
2373 | static int add_disk(struct btrfs_root *root, char *name, int namelen) |
2374 | { | |
2375 | struct block_device *bdev; | |
2376 | struct btrfs_path *path; | |
2377 | struct super_block *sb = root->fs_info->sb; | |
2378 | struct btrfs_root *dev_root = root->fs_info->dev_root; | |
2379 | struct btrfs_trans_handle *trans; | |
2380 | struct btrfs_device_item *dev_item; | |
2381 | struct btrfs_key key; | |
2382 | u16 item_size; | |
2383 | u64 num_blocks; | |
2384 | u64 new_blocks; | |
b4100d64 | 2385 | u64 device_id; |
8352d8a4 | 2386 | int ret; |
b4100d64 | 2387 | |
8352d8a4 CM |
2388 | printk("adding disk %s\n", name); |
2389 | path = btrfs_alloc_path(); | |
2390 | if (!path) | |
2391 | return -ENOMEM; | |
2392 | num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super); | |
2393 | bdev = open_bdev_excl(name, O_RDWR, sb); | |
2394 | if (IS_ERR(bdev)) { | |
2395 | ret = PTR_ERR(bdev); | |
2396 | printk("open bdev excl failed ret %d\n", ret); | |
2397 | goto out_nolock; | |
2398 | } | |
2399 | set_blocksize(bdev, sb->s_blocksize); | |
2400 | new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
2401 | key.objectid = num_blocks; | |
2402 | key.offset = new_blocks; | |
2403 | key.flags = 0; | |
2404 | btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY); | |
2405 | ||
2406 | mutex_lock(&dev_root->fs_info->fs_mutex); | |
2407 | trans = btrfs_start_transaction(dev_root, 1); | |
2408 | item_size = sizeof(*dev_item) + namelen; | |
2409 | printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size); | |
2410 | ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size); | |
2411 | if (ret) { | |
2412 | printk("insert failed %d\n", ret); | |
2413 | close_bdev_excl(bdev); | |
2414 | if (ret > 0) | |
2415 | ret = -EEXIST; | |
2416 | goto out; | |
2417 | } | |
2418 | dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2419 | path->slots[0], struct btrfs_device_item); | |
2420 | btrfs_set_device_pathlen(dev_item, namelen); | |
2421 | memcpy(dev_item + 1, name, namelen); | |
b4100d64 CM |
2422 | |
2423 | device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1; | |
2424 | btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id); | |
2425 | btrfs_set_device_id(dev_item, device_id); | |
8352d8a4 CM |
2426 | mark_buffer_dirty(path->nodes[0]); |
2427 | ||
b4100d64 CM |
2428 | ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks, |
2429 | new_blocks); | |
8352d8a4 CM |
2430 | |
2431 | if (!ret) { | |
2432 | btrfs_set_super_total_blocks(root->fs_info->disk_super, | |
2433 | num_blocks + new_blocks); | |
2434 | i_size_write(root->fs_info->btree_inode, | |
2435 | (num_blocks + new_blocks) << | |
2436 | root->fs_info->btree_inode->i_blkbits); | |
2437 | } | |
2438 | ||
2439 | out: | |
2440 | ret = btrfs_commit_transaction(trans, dev_root); | |
2441 | BUG_ON(ret); | |
2442 | mutex_unlock(&root->fs_info->fs_mutex); | |
2443 | out_nolock: | |
2444 | btrfs_free_path(path); | |
35b7e476 | 2445 | btrfs_btree_balance_dirty(root); |
8352d8a4 CM |
2446 | |
2447 | return ret; | |
2448 | } | |
2449 | ||
c5739bba CM |
2450 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
2451 | cmd, unsigned long arg) | |
2452 | { | |
2453 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2454 | struct btrfs_ioctl_vol_args vol_args; | |
8352d8a4 | 2455 | int ret = 0; |
7e38180e | 2456 | struct btrfs_dir_item *di; |
c5739bba | 2457 | int namelen; |
2619ba1f CM |
2458 | struct btrfs_path *path; |
2459 | u64 root_dirid; | |
c5739bba | 2460 | |
c5739bba CM |
2461 | switch (cmd) { |
2462 | case BTRFS_IOC_SNAP_CREATE: | |
2463 | if (copy_from_user(&vol_args, | |
2464 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2465 | sizeof(vol_args))) | |
2466 | return -EFAULT; | |
2467 | namelen = strlen(vol_args.name); | |
2468 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2469 | return -EINVAL; | |
2619ba1f CM |
2470 | path = btrfs_alloc_path(); |
2471 | if (!path) | |
2472 | return -ENOMEM; | |
2d13d8d0 | 2473 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
2619ba1f | 2474 | mutex_lock(&root->fs_info->fs_mutex); |
7e38180e | 2475 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
2619ba1f CM |
2476 | path, root_dirid, |
2477 | vol_args.name, namelen, 0); | |
2478 | mutex_unlock(&root->fs_info->fs_mutex); | |
2d13d8d0 | 2479 | btrfs_free_path(path); |
7e38180e | 2480 | if (di && !IS_ERR(di)) |
2619ba1f CM |
2481 | return -EEXIST; |
2482 | ||
2483 | if (root == root->fs_info->tree_root) | |
2484 | ret = create_subvol(root, vol_args.name, namelen); | |
2485 | else | |
2486 | ret = create_snapshot(root, vol_args.name, namelen); | |
c5739bba CM |
2487 | WARN_ON(ret); |
2488 | break; | |
8352d8a4 CM |
2489 | case BTRFS_IOC_ADD_DISK: |
2490 | if (copy_from_user(&vol_args, | |
2491 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2492 | sizeof(vol_args))) | |
2493 | return -EFAULT; | |
2494 | namelen = strlen(vol_args.name); | |
2495 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2496 | return -EINVAL; | |
2497 | vol_args.name[namelen] = '\0'; | |
2498 | ret = add_disk(root, vol_args.name, namelen); | |
2499 | break; | |
c5739bba CM |
2500 | default: |
2501 | return -ENOTTY; | |
2502 | } | |
8352d8a4 | 2503 | return ret; |
c5739bba CM |
2504 | } |
2505 | ||
2c90e5d6 CM |
2506 | static struct kmem_cache *btrfs_inode_cachep; |
2507 | struct kmem_cache *btrfs_trans_handle_cachep; | |
2508 | struct kmem_cache *btrfs_transaction_cachep; | |
2509 | struct kmem_cache *btrfs_bit_radix_cachep; | |
2510 | struct kmem_cache *btrfs_path_cachep; | |
2511 | ||
2512 | /* | |
2513 | * Called inside transaction, so use GFP_NOFS | |
2514 | */ | |
2515 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2516 | { | |
2517 | struct btrfs_inode *ei; | |
2518 | ||
2519 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2520 | if (!ei) | |
2521 | return NULL; | |
2c90e5d6 CM |
2522 | return &ei->vfs_inode; |
2523 | } | |
2524 | ||
2525 | static void btrfs_destroy_inode(struct inode *inode) | |
2526 | { | |
2c90e5d6 | 2527 | WARN_ON(!list_empty(&inode->i_dentry)); |
2c90e5d6 CM |
2528 | WARN_ON(inode->i_data.nrpages); |
2529 | ||
2c90e5d6 CM |
2530 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2531 | } | |
2532 | ||
2533 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2534 | unsigned long flags) | |
2535 | { | |
2536 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2537 | ||
f9f3c6b6 | 2538 | if ((flags & (SLAB_CTOR_CONSTRUCTOR)) == |
2c90e5d6 CM |
2539 | SLAB_CTOR_CONSTRUCTOR) { |
2540 | inode_init_once(&ei->vfs_inode); | |
2541 | } | |
2542 | } | |
2543 | ||
2544 | static int init_inodecache(void) | |
2545 | { | |
2546 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
2547 | sizeof(struct btrfs_inode), | |
2548 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2549 | SLAB_MEM_SPREAD), | |
2550 | init_once, NULL); | |
2551 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
2552 | sizeof(struct btrfs_trans_handle), | |
2553 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2554 | SLAB_MEM_SPREAD), | |
2555 | NULL, NULL); | |
2556 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
2557 | sizeof(struct btrfs_transaction), | |
2558 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2559 | SLAB_MEM_SPREAD), | |
2560 | NULL, NULL); | |
2561 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
2562 | sizeof(struct btrfs_transaction), | |
2563 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2564 | SLAB_MEM_SPREAD), | |
2565 | NULL, NULL); | |
2566 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
2567 | 256, | |
2568 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2569 | SLAB_MEM_SPREAD | | |
2570 | SLAB_DESTROY_BY_RCU), | |
2571 | NULL, NULL); | |
2572 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
2573 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
2574 | return -ENOMEM; | |
2575 | return 0; | |
2576 | } | |
2577 | ||
2578 | static void destroy_inodecache(void) | |
2579 | { | |
2580 | kmem_cache_destroy(btrfs_inode_cachep); | |
2581 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2582 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2583 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2584 | kmem_cache_destroy(btrfs_path_cachep); | |
2585 | } | |
2586 | ||
2e635a27 CM |
2587 | static int btrfs_get_sb(struct file_system_type *fs_type, |
2588 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
2589 | { | |
2590 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
2591 | btrfs_fill_super, mnt); | |
2592 | } | |
2593 | ||
236454df CM |
2594 | static int btrfs_getattr(struct vfsmount *mnt, |
2595 | struct dentry *dentry, struct kstat *stat) | |
2596 | { | |
2597 | struct inode *inode = dentry->d_inode; | |
2598 | generic_fillattr(inode, stat); | |
2599 | stat->blksize = 256 * 1024; | |
2600 | return 0; | |
2601 | } | |
2602 | ||
8fd17795 CM |
2603 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2604 | { | |
2605 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
2606 | struct btrfs_super_block *disk_super = root->fs_info->disk_super; | |
2607 | ||
2608 | buf->f_namelen = BTRFS_NAME_LEN; | |
2609 | buf->f_blocks = btrfs_super_total_blocks(disk_super); | |
2610 | buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super); | |
2611 | buf->f_bavail = buf->f_bfree; | |
2612 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2613 | buf->f_type = BTRFS_SUPER_MAGIC; | |
2614 | return 0; | |
2615 | } | |
b5133862 | 2616 | |
e06afa83 CM |
2617 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, |
2618 | struct inode * new_dir,struct dentry *new_dentry) | |
2619 | { | |
2620 | struct btrfs_trans_handle *trans; | |
2621 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2622 | struct inode *new_inode = new_dentry->d_inode; | |
2623 | struct inode *old_inode = old_dentry->d_inode; | |
2624 | struct timespec ctime = CURRENT_TIME; | |
2625 | struct btrfs_path *path; | |
2626 | struct btrfs_dir_item *di; | |
2627 | int ret; | |
2628 | ||
2629 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2630 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2631 | return -ENOTEMPTY; | |
2632 | } | |
2633 | mutex_lock(&root->fs_info->fs_mutex); | |
2634 | trans = btrfs_start_transaction(root, 1); | |
2635 | btrfs_set_trans_block_group(trans, new_dir); | |
2636 | path = btrfs_alloc_path(); | |
2637 | if (!path) { | |
2638 | ret = -ENOMEM; | |
2639 | goto out_fail; | |
2640 | } | |
2641 | ||
2642 | old_dentry->d_inode->i_nlink++; | |
2643 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2644 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2645 | old_inode->i_ctime = ctime; | |
2646 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { | |
2647 | struct btrfs_key *location = &BTRFS_I(new_dir)->location; | |
2648 | u64 old_parent_oid; | |
2649 | di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino, | |
2650 | "..", 2, -1); | |
2651 | if (IS_ERR(di)) { | |
2652 | ret = PTR_ERR(di); | |
2653 | goto out_fail; | |
2654 | } | |
2655 | if (!di) { | |
2656 | ret = -ENOENT; | |
2657 | goto out_fail; | |
2658 | } | |
2659 | old_parent_oid = btrfs_disk_key_objectid(&di->location); | |
2660 | ret = btrfs_del_item(trans, root, path); | |
2661 | if (ret) { | |
2662 | ret = -EIO; | |
2663 | goto out_fail; | |
2664 | } | |
2665 | btrfs_release_path(root, path); | |
2666 | ||
2667 | di = btrfs_lookup_dir_index_item(trans, root, path, | |
2668 | old_inode->i_ino, | |
2669 | old_parent_oid, | |
2670 | "..", 2, -1); | |
2671 | if (IS_ERR(di)) { | |
2672 | ret = PTR_ERR(di); | |
2673 | goto out_fail; | |
2674 | } | |
2675 | if (!di) { | |
2676 | ret = -ENOENT; | |
2677 | goto out_fail; | |
2678 | } | |
2679 | ret = btrfs_del_item(trans, root, path); | |
2680 | if (ret) { | |
2681 | ret = -EIO; | |
2682 | goto out_fail; | |
2683 | } | |
2684 | btrfs_release_path(root, path); | |
2685 | ||
2686 | ret = btrfs_insert_dir_item(trans, root, "..", 2, | |
2687 | old_inode->i_ino, location, 0); | |
2688 | if (ret) | |
2689 | goto out_fail; | |
2690 | } | |
2691 | ||
2692 | ||
e06afa83 CM |
2693 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2694 | if (ret) | |
2695 | goto out_fail; | |
2696 | ||
2697 | if (new_inode) { | |
2698 | new_inode->i_ctime = CURRENT_TIME; | |
2b8d99a7 CM |
2699 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); |
2700 | if (ret) | |
2701 | goto out_fail; | |
e06afa83 CM |
2702 | if (S_ISDIR(new_inode->i_mode)) |
2703 | clear_nlink(new_inode); | |
2704 | else | |
2705 | drop_nlink(new_inode); | |
2706 | btrfs_update_inode(trans, root, new_inode); | |
2707 | } | |
2b8d99a7 CM |
2708 | ret = btrfs_add_link(trans, new_dentry, old_inode); |
2709 | if (ret) | |
2710 | goto out_fail; | |
2711 | ||
e06afa83 CM |
2712 | out_fail: |
2713 | btrfs_free_path(path); | |
2714 | btrfs_end_transaction(trans, root); | |
2715 | mutex_unlock(&root->fs_info->fs_mutex); | |
2716 | return ret; | |
2717 | } | |
2718 | ||
2b8d99a7 CM |
2719 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
2720 | const char *symname) | |
2721 | { | |
2722 | struct btrfs_trans_handle *trans; | |
2723 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2724 | struct btrfs_path *path; | |
2725 | struct btrfs_key key; | |
2726 | struct inode *inode; | |
2727 | int err; | |
2728 | int drop_inode = 0; | |
2729 | u64 objectid; | |
2730 | int name_len; | |
2731 | int datasize; | |
2732 | char *ptr; | |
2733 | struct btrfs_file_extent_item *ei; | |
2734 | ||
2735 | name_len = strlen(symname) + 1; | |
2736 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2737 | return -ENAMETOOLONG; | |
2738 | mutex_lock(&root->fs_info->fs_mutex); | |
2739 | trans = btrfs_start_transaction(root, 1); | |
2740 | btrfs_set_trans_block_group(trans, dir); | |
2741 | ||
2742 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2743 | if (err) { | |
2744 | err = -ENOSPC; | |
2745 | goto out_unlock; | |
2746 | } | |
2747 | ||
2748 | inode = btrfs_new_inode(trans, root, objectid, | |
2749 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2750 | err = PTR_ERR(inode); | |
2751 | if (IS_ERR(inode)) | |
2752 | goto out_unlock; | |
2753 | ||
2754 | btrfs_set_trans_block_group(trans, inode); | |
2755 | err = btrfs_add_nondir(trans, dentry, inode); | |
2756 | if (err) | |
2757 | drop_inode = 1; | |
2758 | else { | |
2759 | inode->i_mapping->a_ops = &btrfs_aops; | |
2760 | inode->i_fop = &btrfs_file_operations; | |
2761 | inode->i_op = &btrfs_file_inode_operations; | |
2762 | } | |
2763 | dir->i_sb->s_dirt = 1; | |
2764 | btrfs_update_inode_block_group(trans, inode); | |
2765 | btrfs_update_inode_block_group(trans, dir); | |
2766 | if (drop_inode) | |
2767 | goto out_unlock; | |
2768 | ||
2769 | path = btrfs_alloc_path(); | |
2770 | BUG_ON(!path); | |
2771 | key.objectid = inode->i_ino; | |
2772 | key.offset = 0; | |
2773 | key.flags = 0; | |
2774 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
2775 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2776 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2777 | datasize); | |
2778 | BUG_ON(err); | |
2779 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2780 | path->slots[0], struct btrfs_file_extent_item); | |
2781 | btrfs_set_file_extent_generation(ei, trans->transid); | |
2782 | btrfs_set_file_extent_type(ei, | |
2783 | BTRFS_FILE_EXTENT_INLINE); | |
2784 | ptr = btrfs_file_extent_inline_start(ei); | |
2785 | btrfs_memcpy(root, path->nodes[0]->b_data, | |
2786 | ptr, symname, name_len); | |
2787 | mark_buffer_dirty(path->nodes[0]); | |
2788 | btrfs_free_path(path); | |
2789 | inode->i_op = &btrfs_symlink_inode_operations; | |
2790 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2791 | inode->i_size = name_len - 1; | |
2792 | btrfs_update_inode(trans, root, inode); | |
2793 | err = 0; | |
2794 | ||
2795 | out_unlock: | |
2796 | btrfs_end_transaction(trans, root); | |
2797 | mutex_unlock(&root->fs_info->fs_mutex); | |
2798 | ||
2799 | if (drop_inode) { | |
2800 | inode_dec_link_count(inode); | |
2801 | iput(inode); | |
2802 | } | |
2803 | btrfs_btree_balance_dirty(root); | |
2804 | return err; | |
2805 | } | |
2806 | ||
2e635a27 CM |
2807 | static struct file_system_type btrfs_fs_type = { |
2808 | .owner = THIS_MODULE, | |
2809 | .name = "btrfs", | |
2810 | .get_sb = btrfs_get_sb, | |
2811 | .kill_sb = kill_block_super, | |
2812 | .fs_flags = FS_REQUIRES_DEV, | |
2813 | }; | |
2814 | ||
e20d96d6 | 2815 | static struct super_operations btrfs_super_ops = { |
134e9731 | 2816 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
2817 | .put_super = btrfs_put_super, |
2818 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
2819 | .write_super = btrfs_write_super, |
2820 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 2821 | .write_inode = btrfs_write_inode, |
b5133862 | 2822 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
2823 | .alloc_inode = btrfs_alloc_inode, |
2824 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2825 | .statfs = btrfs_statfs, |
e20d96d6 CM |
2826 | }; |
2827 | ||
2828 | static struct inode_operations btrfs_dir_inode_operations = { | |
2829 | .lookup = btrfs_lookup, | |
d5719762 | 2830 | .create = btrfs_create, |
134e9731 | 2831 | .unlink = btrfs_unlink, |
2b8d99a7 | 2832 | .link = btrfs_link, |
f7922033 | 2833 | .mkdir = btrfs_mkdir, |
5f443fd2 | 2834 | .rmdir = btrfs_rmdir, |
e06afa83 | 2835 | .rename = btrfs_rename, |
2b8d99a7 | 2836 | .symlink = btrfs_symlink, |
3a686375 | 2837 | .setattr = btrfs_setattr, |
e20d96d6 CM |
2838 | }; |
2839 | ||
d6e4a428 CM |
2840 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2841 | .lookup = btrfs_lookup, | |
2842 | }; | |
2843 | ||
e20d96d6 CM |
2844 | static struct file_operations btrfs_dir_file_operations = { |
2845 | .llseek = generic_file_llseek, | |
2846 | .read = generic_read_dir, | |
2847 | .readdir = btrfs_readdir, | |
c5739bba | 2848 | .ioctl = btrfs_ioctl, |
e20d96d6 CM |
2849 | }; |
2850 | ||
dee26a9f CM |
2851 | static struct address_space_operations btrfs_aops = { |
2852 | .readpage = btrfs_readpage, | |
dee26a9f CM |
2853 | .writepage = btrfs_writepage, |
2854 | .sync_page = block_sync_page, | |
2855 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 2856 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
2857 | }; |
2858 | ||
2b8d99a7 CM |
2859 | static struct address_space_operations btrfs_symlink_aops = { |
2860 | .readpage = btrfs_readpage, | |
2861 | .writepage = btrfs_writepage, | |
2862 | }; | |
2863 | ||
dee26a9f | 2864 | static struct inode_operations btrfs_file_inode_operations = { |
f4b9aa8d | 2865 | .truncate = btrfs_truncate, |
236454df | 2866 | .getattr = btrfs_getattr, |
3a686375 | 2867 | .setattr = btrfs_setattr, |
dee26a9f CM |
2868 | }; |
2869 | ||
2870 | static struct file_operations btrfs_file_operations = { | |
2871 | .llseek = generic_file_llseek, | |
2872 | .read = do_sync_read, | |
e8f05c45 CM |
2873 | .aio_read = btrfs_file_aio_read, |
2874 | .write = btrfs_file_write, | |
dee26a9f CM |
2875 | .mmap = generic_file_mmap, |
2876 | .open = generic_file_open, | |
c5739bba | 2877 | .ioctl = btrfs_ioctl, |
8fd17795 | 2878 | .fsync = btrfs_sync_file, |
dee26a9f | 2879 | }; |
e20d96d6 | 2880 | |
2b8d99a7 CM |
2881 | static struct inode_operations btrfs_symlink_inode_operations = { |
2882 | .readlink = generic_readlink, | |
2883 | .follow_link = page_follow_link_light, | |
2884 | .put_link = page_put_link, | |
2885 | }; | |
2886 | ||
2e635a27 CM |
2887 | static int __init init_btrfs_fs(void) |
2888 | { | |
2c90e5d6 | 2889 | int err; |
2e635a27 | 2890 | printk("btrfs loaded!\n"); |
2c90e5d6 CM |
2891 | err = init_inodecache(); |
2892 | if (err) | |
2893 | return err; | |
2e635a27 | 2894 | return register_filesystem(&btrfs_fs_type); |
d6e4a428 CM |
2895 | destroy_inodecache(); |
2896 | return err; | |
2e635a27 CM |
2897 | } |
2898 | ||
2899 | static void __exit exit_btrfs_fs(void) | |
2900 | { | |
2c90e5d6 | 2901 | destroy_inodecache(); |
2e635a27 CM |
2902 | unregister_filesystem(&btrfs_fs_type); |
2903 | printk("btrfs unloaded\n"); | |
2904 | } | |
2905 | ||
2906 | module_init(init_btrfs_fs) | |
2907 | module_exit(exit_btrfs_fs) | |
2908 | ||
2909 | MODULE_LICENSE("GPL"); |