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> |
08607c1b | 15 | #include <linux/compat.h> |
2e635a27 | 16 | #include "ctree.h" |
e20d96d6 | 17 | #include "disk-io.h" |
d5719762 | 18 | #include "transaction.h" |
2c90e5d6 | 19 | #include "btrfs_inode.h" |
c5739bba | 20 | #include "ioctl.h" |
3a686375 | 21 | #include "print-tree.h" |
2e635a27 | 22 | |
c5739bba CM |
23 | struct btrfs_iget_args { |
24 | u64 ino; | |
25 | struct btrfs_root *root; | |
26 | }; | |
27 | ||
2e635a27 | 28 | #define BTRFS_SUPER_MAGIC 0x9123682E |
e20d96d6 CM |
29 | |
30 | static struct inode_operations btrfs_dir_inode_operations; | |
2b8d99a7 | 31 | static struct inode_operations btrfs_symlink_inode_operations; |
d6e4a428 | 32 | static struct inode_operations btrfs_dir_ro_inode_operations; |
e20d96d6 CM |
33 | static struct super_operations btrfs_super_ops; |
34 | static struct file_operations btrfs_dir_file_operations; | |
dee26a9f CM |
35 | static struct inode_operations btrfs_file_inode_operations; |
36 | static struct address_space_operations btrfs_aops; | |
2b8d99a7 | 37 | static struct address_space_operations btrfs_symlink_aops; |
dee26a9f | 38 | static struct file_operations btrfs_file_operations; |
e20d96d6 | 39 | |
1de037a4 CM |
40 | static int drop_extents(struct btrfs_trans_handle *trans, |
41 | struct btrfs_root *root, | |
42 | struct inode *inode, | |
43 | u64 start, u64 end, u64 *hint_block); | |
44 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
45 | struct buffer_head *result, int create); | |
46 | ||
fabb5681 CM |
47 | |
48 | #define S_SHIFT 12 | |
49 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
50 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
51 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
52 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
53 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
54 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
55 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
56 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
57 | }; | |
58 | ||
e20d96d6 | 59 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 60 | { |
5caf2a00 | 61 | struct btrfs_path *path; |
e20d96d6 | 62 | struct btrfs_inode_item *inode_item; |
d6e4a428 CM |
63 | struct btrfs_root *root = BTRFS_I(inode)->root; |
64 | struct btrfs_key location; | |
31f3c99b | 65 | u64 alloc_group_block; |
e20d96d6 | 66 | int ret; |
f4b9aa8d | 67 | |
5caf2a00 CM |
68 | path = btrfs_alloc_path(); |
69 | BUG_ON(!path); | |
70 | btrfs_init_path(path); | |
f4b9aa8d CM |
71 | mutex_lock(&root->fs_info->fs_mutex); |
72 | ||
d6e4a428 CM |
73 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
74 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
e20d96d6 | 75 | if (ret) { |
7cfcc17e | 76 | btrfs_free_path(path); |
d6e4a428 | 77 | goto make_bad; |
e20d96d6 | 78 | } |
5caf2a00 CM |
79 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
80 | path->slots[0], | |
e20d96d6 | 81 | struct btrfs_inode_item); |
2e635a27 | 82 | |
e20d96d6 CM |
83 | inode->i_mode = btrfs_inode_mode(inode_item); |
84 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
85 | inode->i_uid = btrfs_inode_uid(inode_item); | |
86 | inode->i_gid = btrfs_inode_gid(inode_item); | |
87 | inode->i_size = btrfs_inode_size(inode_item); | |
88 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
89 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
90 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
91 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
92 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
93 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
94 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
95 | inode->i_generation = btrfs_inode_generation(inode_item); | |
31f3c99b | 96 | alloc_group_block = btrfs_inode_block_group(inode_item); |
5276aeda CM |
97 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
98 | alloc_group_block); | |
5caf2a00 | 99 | |
5caf2a00 CM |
100 | btrfs_free_path(path); |
101 | inode_item = NULL; | |
102 | ||
f4b9aa8d | 103 | mutex_unlock(&root->fs_info->fs_mutex); |
1b05da2e | 104 | |
e20d96d6 CM |
105 | switch (inode->i_mode & S_IFMT) { |
106 | #if 0 | |
107 | default: | |
108 | init_special_inode(inode, inode->i_mode, | |
109 | btrfs_inode_rdev(inode_item)); | |
110 | break; | |
111 | #endif | |
112 | case S_IFREG: | |
dee26a9f CM |
113 | inode->i_mapping->a_ops = &btrfs_aops; |
114 | inode->i_fop = &btrfs_file_operations; | |
115 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
116 | break; |
117 | case S_IFDIR: | |
e20d96d6 | 118 | inode->i_fop = &btrfs_dir_file_operations; |
d6e4a428 CM |
119 | if (root == root->fs_info->tree_root) |
120 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
121 | else | |
122 | inode->i_op = &btrfs_dir_inode_operations; | |
e20d96d6 CM |
123 | break; |
124 | case S_IFLNK: | |
2b8d99a7 CM |
125 | inode->i_op = &btrfs_symlink_inode_operations; |
126 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
e20d96d6 | 127 | break; |
2e635a27 | 128 | } |
e20d96d6 | 129 | return; |
d6e4a428 CM |
130 | |
131 | make_bad: | |
132 | btrfs_release_path(root, path); | |
133 | btrfs_free_path(path); | |
134 | mutex_unlock(&root->fs_info->fs_mutex); | |
135 | make_bad_inode(inode); | |
2e635a27 CM |
136 | } |
137 | ||
f68cad0f CM |
138 | static void fill_inode_item(struct btrfs_inode_item *item, |
139 | struct inode *inode) | |
140 | { | |
141 | btrfs_set_inode_uid(item, inode->i_uid); | |
142 | btrfs_set_inode_gid(item, inode->i_gid); | |
143 | btrfs_set_inode_size(item, inode->i_size); | |
144 | btrfs_set_inode_mode(item, inode->i_mode); | |
145 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
146 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
147 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
148 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
149 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
150 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
151 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
152 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
153 | btrfs_set_inode_generation(item, inode->i_generation); | |
31f3c99b CM |
154 | btrfs_set_inode_block_group(item, |
155 | BTRFS_I(inode)->block_group->key.objectid); | |
f68cad0f CM |
156 | } |
157 | ||
f68cad0f CM |
158 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
159 | struct btrfs_root *root, | |
160 | struct inode *inode) | |
161 | { | |
162 | struct btrfs_inode_item *inode_item; | |
163 | struct btrfs_path *path; | |
164 | int ret; | |
165 | ||
166 | path = btrfs_alloc_path(); | |
167 | BUG_ON(!path); | |
168 | btrfs_init_path(path); | |
169 | ret = btrfs_lookup_inode(trans, root, path, | |
170 | &BTRFS_I(inode)->location, 1); | |
171 | if (ret) { | |
172 | if (ret > 0) | |
173 | ret = -ENOENT; | |
174 | goto failed; | |
175 | } | |
176 | ||
177 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
178 | path->slots[0], | |
179 | struct btrfs_inode_item); | |
180 | ||
181 | fill_inode_item(inode_item, inode); | |
182 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
183 | ret = 0; | |
184 | failed: | |
185 | btrfs_release_path(root, path); | |
186 | btrfs_free_path(path); | |
187 | return ret; | |
188 | } | |
189 | ||
190 | ||
5f443fd2 CM |
191 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
192 | struct btrfs_root *root, | |
193 | struct inode *dir, | |
194 | struct dentry *dentry) | |
134e9731 | 195 | { |
5caf2a00 | 196 | struct btrfs_path *path; |
134e9731 CM |
197 | const char *name = dentry->d_name.name; |
198 | int name_len = dentry->d_name.len; | |
7e38180e | 199 | int ret = 0; |
134e9731 CM |
200 | u64 objectid; |
201 | struct btrfs_dir_item *di; | |
202 | ||
5caf2a00 CM |
203 | path = btrfs_alloc_path(); |
204 | BUG_ON(!path); | |
205 | btrfs_init_path(path); | |
7e38180e | 206 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
134e9731 | 207 | name, name_len, -1); |
7e38180e CM |
208 | if (IS_ERR(di)) { |
209 | ret = PTR_ERR(di); | |
134e9731 | 210 | goto err; |
7e38180e CM |
211 | } |
212 | if (!di) { | |
134e9731 CM |
213 | ret = -ENOENT; |
214 | goto err; | |
215 | } | |
d6e4a428 | 216 | objectid = btrfs_disk_key_objectid(&di->location); |
7e38180e CM |
217 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
218 | BUG_ON(ret); | |
219 | btrfs_release_path(root, path); | |
134e9731 | 220 | |
7e38180e CM |
221 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
222 | objectid, name, name_len, -1); | |
223 | if (IS_ERR(di)) { | |
224 | ret = PTR_ERR(di); | |
225 | goto err; | |
226 | } | |
227 | if (!di) { | |
228 | ret = -ENOENT; | |
229 | goto err; | |
230 | } | |
231 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
5f26f772 CM |
232 | BUG_ON(ret); |
233 | ||
134e9731 CM |
234 | dentry->d_inode->i_ctime = dir->i_ctime; |
235 | err: | |
5caf2a00 | 236 | btrfs_free_path(path); |
f68cad0f | 237 | if (!ret) { |
5f26f772 | 238 | dir->i_size -= name_len * 2; |
f68cad0f CM |
239 | btrfs_update_inode(trans, root, dir); |
240 | drop_nlink(dentry->d_inode); | |
241 | btrfs_update_inode(trans, root, dentry->d_inode); | |
cd1bc465 | 242 | dir->i_sb->s_dirt = 1; |
d4dbff95 | 243 | } |
134e9731 CM |
244 | return ret; |
245 | } | |
246 | ||
5f443fd2 CM |
247 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
248 | { | |
249 | struct btrfs_root *root; | |
250 | struct btrfs_trans_handle *trans; | |
251 | int ret; | |
252 | ||
d6e4a428 | 253 | root = BTRFS_I(dir)->root; |
5f443fd2 CM |
254 | mutex_lock(&root->fs_info->fs_mutex); |
255 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 256 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
257 | ret = btrfs_unlink_trans(trans, root, dir, dentry); |
258 | btrfs_end_transaction(trans, root); | |
259 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 260 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
261 | return ret; |
262 | } | |
263 | ||
264 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
265 | { | |
266 | struct inode *inode = dentry->d_inode; | |
267 | int err; | |
268 | int ret; | |
d6e4a428 | 269 | struct btrfs_root *root = BTRFS_I(dir)->root; |
5caf2a00 | 270 | struct btrfs_path *path; |
5f443fd2 CM |
271 | struct btrfs_key key; |
272 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
273 | struct btrfs_key found_key; |
274 | int found_type; | |
5f443fd2 | 275 | struct btrfs_leaf *leaf; |
5f26f772 | 276 | char *goodnames = ".."; |
5f443fd2 | 277 | |
5caf2a00 CM |
278 | path = btrfs_alloc_path(); |
279 | BUG_ON(!path); | |
280 | btrfs_init_path(path); | |
5f443fd2 CM |
281 | mutex_lock(&root->fs_info->fs_mutex); |
282 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 283 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
284 | key.objectid = inode->i_ino; |
285 | key.offset = (u64)-1; | |
5f26f772 CM |
286 | key.flags = (u32)-1; |
287 | while(1) { | |
288 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
289 | if (ret < 0) { | |
290 | err = ret; | |
291 | goto out; | |
292 | } | |
293 | BUG_ON(ret == 0); | |
294 | if (path->slots[0] == 0) { | |
295 | err = -ENOENT; | |
296 | goto out; | |
297 | } | |
298 | path->slots[0]--; | |
299 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
300 | btrfs_disk_key_to_cpu(&found_key, | |
301 | &leaf->items[path->slots[0]].key); | |
302 | found_type = btrfs_key_type(&found_key); | |
303 | if (found_key.objectid != inode->i_ino) { | |
304 | err = -ENOENT; | |
305 | goto out; | |
306 | } | |
307 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
308 | found_type != BTRFS_DIR_INDEX_KEY) || | |
309 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
310 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
311 | err = -ENOTEMPTY; | |
312 | goto out; | |
313 | } | |
314 | ret = btrfs_del_item(trans, root, path); | |
315 | BUG_ON(ret); | |
5f443fd2 | 316 | |
5f26f772 CM |
317 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
318 | break; | |
319 | btrfs_release_path(root, path); | |
5f443fd2 | 320 | } |
5f26f772 | 321 | ret = 0; |
5caf2a00 | 322 | btrfs_release_path(root, path); |
5f443fd2 CM |
323 | |
324 | /* now the directory is empty */ | |
325 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
326 | if (!err) { | |
327 | inode->i_size = 0; | |
328 | } | |
329 | out: | |
7cfcc17e CM |
330 | btrfs_release_path(root, path); |
331 | btrfs_free_path(path); | |
5f443fd2 CM |
332 | mutex_unlock(&root->fs_info->fs_mutex); |
333 | ret = btrfs_end_transaction(trans, root); | |
35b7e476 | 334 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
335 | if (ret && !err) |
336 | err = ret; | |
337 | return err; | |
338 | } | |
339 | ||
134e9731 CM |
340 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
341 | struct btrfs_root *root, | |
342 | struct inode *inode) | |
343 | { | |
5caf2a00 | 344 | struct btrfs_path *path; |
134e9731 | 345 | int ret; |
5caf2a00 | 346 | |
134e9731 | 347 | clear_inode(inode); |
5caf2a00 CM |
348 | |
349 | path = btrfs_alloc_path(); | |
350 | BUG_ON(!path); | |
351 | btrfs_init_path(path); | |
d6e4a428 CM |
352 | ret = btrfs_lookup_inode(trans, root, path, |
353 | &BTRFS_I(inode)->location, -1); | |
134e9731 | 354 | BUG_ON(ret); |
5caf2a00 | 355 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 356 | BUG_ON(ret); |
5caf2a00 | 357 | btrfs_free_path(path); |
134e9731 CM |
358 | return ret; |
359 | } | |
360 | ||
de428b63 CM |
361 | static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path, |
362 | u64 objectid) | |
363 | { | |
364 | struct btrfs_node *node; | |
365 | int i; | |
366 | int nritems; | |
367 | u64 item_objectid; | |
368 | u64 blocknr; | |
369 | int slot; | |
370 | int ret; | |
371 | ||
372 | if (!path->nodes[1]) | |
373 | return; | |
374 | node = btrfs_buffer_node(path->nodes[1]); | |
375 | slot = path->slots[1]; | |
376 | if (slot == 0) | |
377 | return; | |
378 | nritems = btrfs_header_nritems(&node->header); | |
379 | for (i = slot - 1; i >= 0; i--) { | |
380 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); | |
381 | if (item_objectid != objectid) | |
382 | break; | |
383 | blocknr = btrfs_node_blockptr(node, i); | |
384 | ret = readahead_tree_block(root, blocknr); | |
385 | if (ret) | |
386 | break; | |
387 | } | |
388 | } | |
389 | ||
f4b9aa8d CM |
390 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
391 | struct btrfs_root *root, | |
392 | struct inode *inode) | |
393 | { | |
394 | int ret; | |
5caf2a00 | 395 | struct btrfs_path *path; |
f4b9aa8d CM |
396 | struct btrfs_key key; |
397 | struct btrfs_disk_key *found_key; | |
e06afa83 | 398 | u32 found_type; |
f4b9aa8d | 399 | struct btrfs_leaf *leaf; |
1de037a4 | 400 | struct btrfs_file_extent_item *fi; |
f254e52c CM |
401 | u64 extent_start = 0; |
402 | u64 extent_num_blocks = 0; | |
1de037a4 | 403 | u64 item_end = 0; |
f254e52c | 404 | int found_extent; |
1de037a4 | 405 | int del_item; |
f4b9aa8d | 406 | |
5caf2a00 CM |
407 | path = btrfs_alloc_path(); |
408 | BUG_ON(!path); | |
f4b9aa8d CM |
409 | /* FIXME, add redo link to tree so we don't leak on crash */ |
410 | key.objectid = inode->i_ino; | |
411 | key.offset = (u64)-1; | |
e06afa83 | 412 | key.flags = (u32)-1; |
f4b9aa8d | 413 | while(1) { |
5caf2a00 | 414 | btrfs_init_path(path); |
1de037a4 | 415 | fi = NULL; |
5caf2a00 | 416 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
f4b9aa8d | 417 | if (ret < 0) { |
f4b9aa8d CM |
418 | goto error; |
419 | } | |
420 | if (ret > 0) { | |
5caf2a00 CM |
421 | BUG_ON(path->slots[0] == 0); |
422 | path->slots[0]--; | |
f4b9aa8d | 423 | } |
de428b63 | 424 | reada_truncate(root, path, inode->i_ino); |
5caf2a00 CM |
425 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
426 | found_key = &leaf->items[path->slots[0]].key; | |
e06afa83 | 427 | found_type = btrfs_disk_key_type(found_key); |
f4b9aa8d CM |
428 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
429 | break; | |
e06afa83 CM |
430 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
431 | found_type != BTRFS_DIR_ITEM_KEY && | |
432 | found_type != BTRFS_DIR_INDEX_KEY && | |
433 | found_type != BTRFS_EXTENT_DATA_KEY) | |
f4b9aa8d | 434 | break; |
1de037a4 CM |
435 | item_end = btrfs_disk_key_offset(found_key); |
436 | if (found_type == BTRFS_EXTENT_DATA_KEY) { | |
5caf2a00 CM |
437 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
438 | path->slots[0], | |
f254e52c | 439 | struct btrfs_file_extent_item); |
236454df CM |
440 | if (btrfs_file_extent_type(fi) != |
441 | BTRFS_FILE_EXTENT_INLINE) { | |
1de037a4 CM |
442 | item_end += btrfs_file_extent_num_blocks(fi) << |
443 | inode->i_blkbits; | |
444 | } | |
445 | } | |
446 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
447 | ret = btrfs_csum_truncate(trans, root, path, | |
448 | inode->i_size); | |
449 | BUG_ON(ret); | |
450 | } | |
451 | if (item_end < inode->i_size) { | |
452 | if (found_type) { | |
453 | btrfs_set_key_type(&key, found_type - 1); | |
454 | continue; | |
455 | } | |
456 | break; | |
457 | } | |
458 | if (btrfs_disk_key_offset(found_key) >= inode->i_size) | |
459 | del_item = 1; | |
460 | else | |
461 | del_item = 0; | |
462 | found_extent = 0; | |
463 | ||
464 | if (found_type == BTRFS_EXTENT_DATA_KEY && | |
465 | btrfs_file_extent_type(fi) != | |
466 | BTRFS_FILE_EXTENT_INLINE) { | |
467 | u64 num_dec; | |
468 | if (!del_item) { | |
469 | u64 orig_num_blocks = | |
470 | btrfs_file_extent_num_blocks(fi); | |
471 | extent_num_blocks = inode->i_size - | |
472 | btrfs_disk_key_offset(found_key) + | |
473 | root->blocksize - 1; | |
474 | extent_num_blocks >>= inode->i_blkbits; | |
475 | btrfs_set_file_extent_num_blocks(fi, | |
476 | extent_num_blocks); | |
477 | inode->i_blocks -= (orig_num_blocks - | |
478 | extent_num_blocks) << 3; | |
479 | mark_buffer_dirty(path->nodes[0]); | |
480 | } else { | |
236454df CM |
481 | extent_start = |
482 | btrfs_file_extent_disk_blocknr(fi); | |
483 | extent_num_blocks = | |
484 | btrfs_file_extent_disk_num_blocks(fi); | |
485 | /* FIXME blocksize != 4096 */ | |
3a686375 CM |
486 | num_dec = btrfs_file_extent_num_blocks(fi) << 3; |
487 | if (extent_start != 0) { | |
488 | found_extent = 1; | |
489 | inode->i_blocks -= num_dec; | |
490 | } | |
236454df | 491 | } |
f254e52c | 492 | } |
1de037a4 CM |
493 | if (del_item) { |
494 | ret = btrfs_del_item(trans, root, path); | |
495 | BUG_ON(ret); | |
496 | } else { | |
497 | break; | |
498 | } | |
5caf2a00 | 499 | btrfs_release_path(root, path); |
f254e52c CM |
500 | if (found_extent) { |
501 | ret = btrfs_free_extent(trans, root, extent_start, | |
502 | extent_num_blocks, 0); | |
503 | BUG_ON(ret); | |
504 | } | |
f4b9aa8d | 505 | } |
f4b9aa8d CM |
506 | ret = 0; |
507 | error: | |
5caf2a00 CM |
508 | btrfs_release_path(root, path); |
509 | btrfs_free_path(path); | |
cd1bc465 | 510 | inode->i_sb->s_dirt = 1; |
f4b9aa8d CM |
511 | return ret; |
512 | } | |
513 | ||
1de037a4 CM |
514 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) |
515 | { | |
516 | struct inode *inode = mapping->host; | |
517 | unsigned blocksize = 1 << inode->i_blkbits; | |
518 | pgoff_t index = from >> PAGE_CACHE_SHIFT; | |
519 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
520 | struct page *page; | |
521 | char *kaddr; | |
522 | int ret = 0; | |
523 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
524 | u64 alloc_hint; | |
525 | struct btrfs_key ins; | |
526 | struct btrfs_trans_handle *trans; | |
527 | ||
528 | if ((offset & (blocksize - 1)) == 0) | |
529 | goto out; | |
530 | ||
531 | ret = -ENOMEM; | |
532 | page = grab_cache_page(mapping, index); | |
533 | if (!page) | |
534 | goto out; | |
535 | ||
536 | if (!PageUptodate(page)) { | |
537 | ret = mpage_readpage(page, btrfs_get_block); | |
538 | lock_page(page); | |
539 | if (!PageUptodate(page)) { | |
540 | ret = -EIO; | |
541 | goto out; | |
542 | } | |
543 | } | |
544 | mutex_lock(&root->fs_info->fs_mutex); | |
545 | trans = btrfs_start_transaction(root, 1); | |
546 | btrfs_set_trans_block_group(trans, inode); | |
547 | ||
548 | ret = drop_extents(trans, root, inode, page->index << PAGE_CACHE_SHIFT, | |
549 | (page->index + 1) << PAGE_CACHE_SHIFT, &alloc_hint); | |
550 | BUG_ON(ret); | |
551 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, 1, | |
552 | alloc_hint, (u64)-1, &ins, 1); | |
553 | BUG_ON(ret); | |
554 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
555 | page->index << PAGE_CACHE_SHIFT, | |
556 | ins.objectid, 1, 1); | |
557 | BUG_ON(ret); | |
558 | SetPageChecked(page); | |
559 | kaddr = kmap(page); | |
560 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
561 | flush_dcache_page(page); | |
562 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
563 | page->index << PAGE_CACHE_SHIFT, | |
564 | kaddr, PAGE_CACHE_SIZE); | |
565 | kunmap(page); | |
566 | btrfs_end_transaction(trans, root); | |
567 | mutex_unlock(&root->fs_info->fs_mutex); | |
568 | ||
569 | set_page_dirty(page); | |
570 | unlock_page(page); | |
571 | page_cache_release(page); | |
572 | out: | |
573 | return ret; | |
574 | } | |
575 | ||
3a686375 CM |
576 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
577 | { | |
578 | struct inode *inode = dentry->d_inode; | |
579 | int err; | |
580 | ||
581 | err = inode_change_ok(inode, attr); | |
582 | if (err) | |
583 | return err; | |
584 | ||
585 | if (S_ISREG(inode->i_mode) && | |
586 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
587 | struct btrfs_trans_handle *trans; | |
588 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
589 | u64 mask = root->blocksize - 1; | |
590 | u64 pos = (inode->i_size + mask) & ~mask; | |
591 | u64 hole_size; | |
592 | ||
1de037a4 | 593 | if (attr->ia_size <= pos) |
3a686375 | 594 | goto out; |
1de037a4 CM |
595 | |
596 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
597 | ||
3a686375 CM |
598 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
599 | hole_size >>= inode->i_blkbits; | |
600 | ||
601 | mutex_lock(&root->fs_info->fs_mutex); | |
602 | trans = btrfs_start_transaction(root, 1); | |
603 | btrfs_set_trans_block_group(trans, inode); | |
604 | err = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
605 | pos, 0, 0, hole_size); | |
606 | BUG_ON(err); | |
607 | btrfs_end_transaction(trans, root); | |
608 | mutex_unlock(&root->fs_info->fs_mutex); | |
609 | } | |
1de037a4 | 610 | out: |
3a686375 CM |
611 | err = inode_setattr(inode, attr); |
612 | ||
3a686375 CM |
613 | return err; |
614 | } | |
134e9731 CM |
615 | static void btrfs_delete_inode(struct inode *inode) |
616 | { | |
617 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 618 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
619 | int ret; |
620 | ||
134e9731 CM |
621 | truncate_inode_pages(&inode->i_data, 0); |
622 | if (is_bad_inode(inode)) { | |
623 | goto no_delete; | |
624 | } | |
625 | inode->i_size = 0; | |
134e9731 CM |
626 | mutex_lock(&root->fs_info->fs_mutex); |
627 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 628 | btrfs_set_trans_block_group(trans, inode); |
e06afa83 CM |
629 | ret = btrfs_truncate_in_trans(trans, root, inode); |
630 | BUG_ON(ret); | |
134e9731 CM |
631 | btrfs_free_inode(trans, root, inode); |
632 | btrfs_end_transaction(trans, root); | |
633 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 634 | btrfs_btree_balance_dirty(root); |
134e9731 CM |
635 | return; |
636 | no_delete: | |
637 | clear_inode(inode); | |
638 | } | |
639 | ||
e20d96d6 | 640 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
d6e4a428 | 641 | struct btrfs_key *location) |
e20d96d6 CM |
642 | { |
643 | const char *name = dentry->d_name.name; | |
644 | int namelen = dentry->d_name.len; | |
645 | struct btrfs_dir_item *di; | |
5caf2a00 | 646 | struct btrfs_path *path; |
d6e4a428 | 647 | struct btrfs_root *root = BTRFS_I(dir)->root; |
e20d96d6 CM |
648 | int ret; |
649 | ||
5caf2a00 CM |
650 | path = btrfs_alloc_path(); |
651 | BUG_ON(!path); | |
652 | btrfs_init_path(path); | |
7e38180e | 653 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
e20d96d6 | 654 | namelen, 0); |
7e38180e | 655 | if (!di || IS_ERR(di)) { |
d6e4a428 | 656 | location->objectid = 0; |
2c90e5d6 | 657 | ret = 0; |
e20d96d6 CM |
658 | goto out; |
659 | } | |
d6e4a428 | 660 | btrfs_disk_key_to_cpu(location, &di->location); |
e20d96d6 | 661 | out: |
5caf2a00 CM |
662 | btrfs_release_path(root, path); |
663 | btrfs_free_path(path); | |
e20d96d6 CM |
664 | return ret; |
665 | } | |
666 | ||
35b7e476 | 667 | static int fixup_tree_root_location(struct btrfs_root *root, |
d6e4a428 CM |
668 | struct btrfs_key *location, |
669 | struct btrfs_root **sub_root) | |
670 | { | |
671 | struct btrfs_path *path; | |
672 | struct btrfs_root_item *ri; | |
d6e4a428 CM |
673 | |
674 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
675 | return 0; | |
676 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
677 | return 0; | |
678 | ||
679 | path = btrfs_alloc_path(); | |
680 | BUG_ON(!path); | |
681 | mutex_lock(&root->fs_info->fs_mutex); | |
682 | ||
0f7d52f4 CM |
683 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
684 | if (IS_ERR(*sub_root)) | |
685 | return PTR_ERR(*sub_root); | |
686 | ||
687 | ri = &(*sub_root)->root_item; | |
d6e4a428 CM |
688 | location->objectid = btrfs_root_dirid(ri); |
689 | location->flags = 0; | |
690 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
691 | location->offset = 0; | |
0f7d52f4 | 692 | |
d6e4a428 CM |
693 | btrfs_free_path(path); |
694 | mutex_unlock(&root->fs_info->fs_mutex); | |
0f7d52f4 | 695 | return 0; |
d6e4a428 CM |
696 | } |
697 | ||
35b7e476 | 698 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
c5739bba CM |
699 | { |
700 | struct btrfs_iget_args *args = p; | |
701 | inode->i_ino = args->ino; | |
702 | BTRFS_I(inode)->root = args->root; | |
703 | return 0; | |
704 | } | |
705 | ||
35b7e476 | 706 | static int btrfs_find_actor(struct inode *inode, void *opaque) |
c5739bba CM |
707 | { |
708 | struct btrfs_iget_args *args = opaque; | |
709 | return (args->ino == inode->i_ino && | |
710 | args->root == BTRFS_I(inode)->root); | |
711 | } | |
712 | ||
35b7e476 CM |
713 | static struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
714 | struct btrfs_root *root) | |
c5739bba CM |
715 | { |
716 | struct inode *inode; | |
717 | struct btrfs_iget_args args; | |
718 | args.ino = objectid; | |
719 | args.root = root; | |
720 | ||
721 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
722 | btrfs_init_locked_inode, | |
723 | (void *)&args); | |
724 | return inode; | |
725 | } | |
d6e4a428 | 726 | |
e20d96d6 CM |
727 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
728 | struct nameidata *nd) | |
729 | { | |
730 | struct inode * inode; | |
d6e4a428 CM |
731 | struct btrfs_inode *bi = BTRFS_I(dir); |
732 | struct btrfs_root *root = bi->root; | |
733 | struct btrfs_root *sub_root = root; | |
734 | struct btrfs_key location; | |
e20d96d6 CM |
735 | int ret; |
736 | ||
737 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
738 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 739 | mutex_lock(&root->fs_info->fs_mutex); |
d6e4a428 | 740 | ret = btrfs_inode_by_name(dir, dentry, &location); |
22b0ebda | 741 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
742 | if (ret < 0) |
743 | return ERR_PTR(ret); | |
744 | inode = NULL; | |
d6e4a428 CM |
745 | if (location.objectid) { |
746 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
747 | if (ret < 0) | |
748 | return ERR_PTR(ret); | |
749 | if (ret > 0) | |
750 | return ERR_PTR(-ENOENT); | |
c5739bba CM |
751 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
752 | sub_root); | |
e20d96d6 CM |
753 | if (!inode) |
754 | return ERR_PTR(-EACCES); | |
d6e4a428 | 755 | if (inode->i_state & I_NEW) { |
0f7d52f4 | 756 | if (sub_root != root) { |
c5739bba | 757 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
0f7d52f4 CM |
758 | igrab(inode); |
759 | sub_root->inode = inode; | |
760 | } | |
d6e4a428 CM |
761 | BTRFS_I(inode)->root = sub_root; |
762 | memcpy(&BTRFS_I(inode)->location, &location, | |
763 | sizeof(location)); | |
764 | btrfs_read_locked_inode(inode); | |
765 | unlock_new_inode(inode); | |
766 | } | |
e20d96d6 CM |
767 | } |
768 | return d_splice_alias(inode, dentry); | |
769 | } | |
770 | ||
de428b63 CM |
771 | static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path, |
772 | u64 objectid) | |
090d1875 CM |
773 | { |
774 | struct btrfs_node *node; | |
775 | int i; | |
de428b63 | 776 | u32 nritems; |
090d1875 CM |
777 | u64 item_objectid; |
778 | u64 blocknr; | |
779 | int slot; | |
de428b63 | 780 | int ret; |
090d1875 CM |
781 | |
782 | if (!path->nodes[1]) | |
783 | return; | |
784 | node = btrfs_buffer_node(path->nodes[1]); | |
785 | slot = path->slots[1]; | |
090d1875 | 786 | nritems = btrfs_header_nritems(&node->header); |
de428b63 | 787 | for (i = slot + 1; i < nritems; i++) { |
090d1875 CM |
788 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); |
789 | if (item_objectid != objectid) | |
790 | break; | |
791 | blocknr = btrfs_node_blockptr(node, i); | |
de428b63 CM |
792 | ret = readahead_tree_block(root, blocknr); |
793 | if (ret) | |
794 | break; | |
090d1875 CM |
795 | } |
796 | } | |
fabb5681 CM |
797 | static unsigned char btrfs_filetype_table[] = { |
798 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
799 | }; | |
090d1875 | 800 | |
e20d96d6 CM |
801 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
802 | { | |
803 | struct inode *inode = filp->f_path.dentry->d_inode; | |
d6e4a428 | 804 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e20d96d6 CM |
805 | struct btrfs_item *item; |
806 | struct btrfs_dir_item *di; | |
807 | struct btrfs_key key; | |
5caf2a00 | 808 | struct btrfs_path *path; |
e20d96d6 CM |
809 | int ret; |
810 | u32 nritems; | |
811 | struct btrfs_leaf *leaf; | |
812 | int slot; | |
813 | int advance; | |
fabb5681 | 814 | unsigned char d_type; |
7f5c1516 | 815 | int over = 0; |
7e38180e CM |
816 | u32 di_cur; |
817 | u32 di_total; | |
818 | u32 di_len; | |
819 | int key_type = BTRFS_DIR_INDEX_KEY; | |
d6e4a428 CM |
820 | |
821 | /* FIXME, use a real flag for deciding about the key type */ | |
822 | if (root->fs_info->tree_root == root) | |
823 | key_type = BTRFS_DIR_ITEM_KEY; | |
22b0ebda | 824 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 825 | key.objectid = inode->i_ino; |
e20d96d6 | 826 | key.flags = 0; |
d6e4a428 | 827 | btrfs_set_key_type(&key, key_type); |
e20d96d6 | 828 | key.offset = filp->f_pos; |
5caf2a00 CM |
829 | path = btrfs_alloc_path(); |
830 | btrfs_init_path(path); | |
831 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1b05da2e | 832 | if (ret < 0) |
e20d96d6 | 833 | goto err; |
7f5c1516 | 834 | advance = 0; |
de428b63 | 835 | reada_leaves(root, path, inode->i_ino); |
e20d96d6 | 836 | while(1) { |
5caf2a00 | 837 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 838 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 839 | slot = path->slots[0]; |
dee26a9f CM |
840 | if (advance || slot >= nritems) { |
841 | if (slot >= nritems -1) { | |
de428b63 | 842 | reada_leaves(root, path, inode->i_ino); |
5caf2a00 | 843 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
844 | if (ret) |
845 | break; | |
5caf2a00 | 846 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 847 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 848 | slot = path->slots[0]; |
e20d96d6 CM |
849 | } else { |
850 | slot++; | |
5caf2a00 | 851 | path->slots[0]++; |
e20d96d6 CM |
852 | } |
853 | } | |
854 | advance = 1; | |
855 | item = leaf->items + slot; | |
e20d96d6 CM |
856 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
857 | break; | |
d6e4a428 | 858 | if (btrfs_disk_key_type(&item->key) != key_type) |
a429e513 | 859 | break; |
7f5c1516 CM |
860 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
861 | continue; | |
7fcde0e3 | 862 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
dee26a9f | 863 | advance = 1; |
e20d96d6 | 864 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
7e38180e CM |
865 | di_cur = 0; |
866 | di_total = btrfs_item_size(leaf->items + slot); | |
867 | while(di_cur < di_total) { | |
fabb5681 | 868 | d_type = btrfs_filetype_table[btrfs_dir_type(di)]; |
7e38180e CM |
869 | over = filldir(dirent, (const char *)(di + 1), |
870 | btrfs_dir_name_len(di), | |
871 | btrfs_disk_key_offset(&item->key), | |
872 | btrfs_disk_key_objectid(&di->location), | |
873 | d_type); | |
874 | if (over) | |
875 | goto nopos; | |
876 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
877 | di_cur += di_len; | |
878 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
879 | } | |
e20d96d6 | 880 | } |
7fcde0e3 CM |
881 | filp->f_pos++; |
882 | nopos: | |
e20d96d6 CM |
883 | ret = 0; |
884 | err: | |
5caf2a00 CM |
885 | btrfs_release_path(root, path); |
886 | btrfs_free_path(path); | |
22b0ebda | 887 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
888 | return ret; |
889 | } | |
890 | ||
891 | static void btrfs_put_super (struct super_block * sb) | |
892 | { | |
893 | struct btrfs_root *root = btrfs_sb(sb); | |
894 | int ret; | |
895 | ||
896 | ret = close_ctree(root); | |
897 | if (ret) { | |
898 | printk("close ctree returns %d\n", ret); | |
899 | } | |
900 | sb->s_fs_info = NULL; | |
901 | } | |
2e635a27 CM |
902 | |
903 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
904 | { | |
905 | struct inode * inode; | |
e20d96d6 CM |
906 | struct dentry * root_dentry; |
907 | struct btrfs_super_block *disk_super; | |
0f7d52f4 | 908 | struct btrfs_root *tree_root; |
d6e4a428 | 909 | struct btrfs_inode *bi; |
2e635a27 CM |
910 | |
911 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 912 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 913 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 914 | sb->s_time_gran = 1; |
e20d96d6 | 915 | |
0f7d52f4 | 916 | tree_root = open_ctree(sb); |
d98237b3 | 917 | |
0f7d52f4 | 918 | if (!tree_root) { |
e20d96d6 CM |
919 | printk("btrfs: open_ctree failed\n"); |
920 | return -EIO; | |
921 | } | |
0f7d52f4 CM |
922 | sb->s_fs_info = tree_root; |
923 | disk_super = tree_root->fs_info->disk_super; | |
e20d96d6 CM |
924 | printk("read in super total blocks %Lu root %Lu\n", |
925 | btrfs_super_total_blocks(disk_super), | |
926 | btrfs_super_root_dir(disk_super)); | |
927 | ||
c5739bba CM |
928 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
929 | tree_root); | |
d6e4a428 CM |
930 | bi = BTRFS_I(inode); |
931 | bi->location.objectid = inode->i_ino; | |
932 | bi->location.offset = 0; | |
933 | bi->location.flags = 0; | |
0f7d52f4 | 934 | bi->root = tree_root; |
d6e4a428 CM |
935 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
936 | ||
2e635a27 CM |
937 | if (!inode) |
938 | return -ENOMEM; | |
e20d96d6 CM |
939 | if (inode->i_state & I_NEW) { |
940 | btrfs_read_locked_inode(inode); | |
941 | unlock_new_inode(inode); | |
942 | } | |
2e635a27 | 943 | |
e20d96d6 CM |
944 | root_dentry = d_alloc_root(inode); |
945 | if (!root_dentry) { | |
2e635a27 CM |
946 | iput(inode); |
947 | return -ENOMEM; | |
948 | } | |
e20d96d6 | 949 | sb->s_root = root_dentry; |
08607c1b | 950 | btrfs_transaction_queue_work(tree_root, HZ * 30); |
2e635a27 CM |
951 | return 0; |
952 | } | |
953 | ||
4730a4bc CM |
954 | static int btrfs_write_inode(struct inode *inode, int wait) |
955 | { | |
d6e4a428 | 956 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4730a4bc | 957 | struct btrfs_trans_handle *trans; |
b5133862 CM |
958 | int ret = 0; |
959 | ||
960 | if (wait) { | |
961 | mutex_lock(&root->fs_info->fs_mutex); | |
962 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 963 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
964 | ret = btrfs_commit_transaction(trans, root); |
965 | mutex_unlock(&root->fs_info->fs_mutex); | |
966 | } | |
967 | return ret; | |
968 | } | |
969 | ||
970 | static void btrfs_dirty_inode(struct inode *inode) | |
971 | { | |
972 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
973 | struct btrfs_trans_handle *trans; | |
4730a4bc CM |
974 | |
975 | mutex_lock(&root->fs_info->fs_mutex); | |
976 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 977 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
978 | btrfs_update_inode(trans, root, inode); |
979 | btrfs_end_transaction(trans, root); | |
4730a4bc | 980 | mutex_unlock(&root->fs_info->fs_mutex); |
35b7e476 | 981 | btrfs_btree_balance_dirty(root); |
4730a4bc CM |
982 | } |
983 | ||
d5719762 | 984 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2619ba1f | 985 | struct btrfs_root *root, |
31f3c99b CM |
986 | u64 objectid, |
987 | struct btrfs_block_group_cache *group, | |
988 | int mode) | |
d5719762 CM |
989 | { |
990 | struct inode *inode; | |
991 | struct btrfs_inode_item inode_item; | |
1b05da2e | 992 | struct btrfs_key *location; |
d5719762 | 993 | int ret; |
de428b63 | 994 | int owner; |
d5719762 | 995 | |
2619ba1f | 996 | inode = new_inode(root->fs_info->sb); |
d5719762 CM |
997 | if (!inode) |
998 | return ERR_PTR(-ENOMEM); | |
999 | ||
2619ba1f | 1000 | BTRFS_I(inode)->root = root; |
de428b63 CM |
1001 | if (mode & S_IFDIR) |
1002 | owner = 0; | |
1003 | else | |
1004 | owner = 1; | |
1005 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
31f3c99b | 1006 | BTRFS_I(inode)->block_group = group; |
d5719762 CM |
1007 | |
1008 | inode->i_uid = current->fsuid; | |
1009 | inode->i_gid = current->fsgid; | |
1010 | inode->i_mode = mode; | |
1011 | inode->i_ino = objectid; | |
1012 | inode->i_blocks = 0; | |
c5739bba | 1013 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
d5719762 | 1014 | fill_inode_item(&inode_item, inode); |
1b05da2e CM |
1015 | location = &BTRFS_I(inode)->location; |
1016 | location->objectid = objectid; | |
1017 | location->flags = 0; | |
1018 | location->offset = 0; | |
1019 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
d5719762 CM |
1020 | |
1021 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
1022 | BUG_ON(ret); | |
1023 | ||
1024 | insert_inode_hash(inode); | |
d5719762 CM |
1025 | return inode; |
1026 | } | |
1027 | ||
fabb5681 CM |
1028 | static inline u8 btrfs_inode_type(struct inode *inode) |
1029 | { | |
1030 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1031 | } | |
1032 | ||
d5719762 CM |
1033 | static int btrfs_add_link(struct btrfs_trans_handle *trans, |
1034 | struct dentry *dentry, struct inode *inode) | |
1035 | { | |
1036 | int ret; | |
d6e4a428 CM |
1037 | struct btrfs_key key; |
1038 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
1039 | key.objectid = inode->i_ino; | |
1040 | key.flags = 0; | |
1041 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1042 | key.offset = 0; | |
1043 | ||
1044 | ret = btrfs_insert_dir_item(trans, root, | |
d5719762 CM |
1045 | dentry->d_name.name, dentry->d_name.len, |
1046 | dentry->d_parent->d_inode->i_ino, | |
fabb5681 | 1047 | &key, btrfs_inode_type(inode)); |
4730a4bc | 1048 | if (ret == 0) { |
5f26f772 | 1049 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
d6e4a428 | 1050 | ret = btrfs_update_inode(trans, root, |
4730a4bc CM |
1051 | dentry->d_parent->d_inode); |
1052 | } | |
d5719762 CM |
1053 | return ret; |
1054 | } | |
1055 | ||
1056 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1057 | struct dentry *dentry, struct inode *inode) | |
1058 | { | |
1059 | int err = btrfs_add_link(trans, dentry, inode); | |
1060 | if (!err) { | |
1061 | d_instantiate(dentry, inode); | |
1062 | return 0; | |
1063 | } | |
2c90e5d6 CM |
1064 | if (err > 0) |
1065 | err = -EEXIST; | |
d5719762 CM |
1066 | return err; |
1067 | } | |
1068 | ||
1069 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
1070 | int mode, struct nameidata *nd) | |
1071 | { | |
1072 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 1073 | struct btrfs_root *root = BTRFS_I(dir)->root; |
d5719762 CM |
1074 | struct inode *inode; |
1075 | int err; | |
134e9731 | 1076 | int drop_inode = 0; |
2619ba1f | 1077 | u64 objectid; |
d5719762 | 1078 | |
d561c025 | 1079 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 | 1080 | trans = btrfs_start_transaction(root, 1); |
31f3c99b | 1081 | btrfs_set_trans_block_group(trans, dir); |
2619ba1f CM |
1082 | |
1083 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1084 | if (err) { | |
1085 | err = -ENOSPC; | |
1086 | goto out_unlock; | |
1087 | } | |
1088 | ||
31f3c99b CM |
1089 | inode = btrfs_new_inode(trans, root, objectid, |
1090 | BTRFS_I(dir)->block_group, mode); | |
d5719762 CM |
1091 | err = PTR_ERR(inode); |
1092 | if (IS_ERR(inode)) | |
d561c025 | 1093 | goto out_unlock; |
31f3c99b CM |
1094 | |
1095 | btrfs_set_trans_block_group(trans, inode); | |
d5719762 | 1096 | err = btrfs_add_nondir(trans, dentry, inode); |
134e9731 CM |
1097 | if (err) |
1098 | drop_inode = 1; | |
dee26a9f CM |
1099 | else { |
1100 | inode->i_mapping->a_ops = &btrfs_aops; | |
1101 | inode->i_fop = &btrfs_file_operations; | |
1102 | inode->i_op = &btrfs_file_inode_operations; | |
1103 | } | |
d5719762 | 1104 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
1105 | btrfs_update_inode_block_group(trans, inode); |
1106 | btrfs_update_inode_block_group(trans, dir); | |
d561c025 | 1107 | out_unlock: |
22b0ebda | 1108 | btrfs_end_transaction(trans, root); |
d561c025 | 1109 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 1110 | |
134e9731 CM |
1111 | if (drop_inode) { |
1112 | inode_dec_link_count(inode); | |
1113 | iput(inode); | |
1114 | } | |
35b7e476 | 1115 | btrfs_btree_balance_dirty(root); |
d5719762 CM |
1116 | return err; |
1117 | } | |
1118 | ||
2b8d99a7 CM |
1119 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, |
1120 | struct dentry *dentry) | |
1121 | { | |
1122 | struct btrfs_trans_handle *trans; | |
1123 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1124 | struct inode *inode = old_dentry->d_inode; | |
1125 | int err; | |
1126 | int drop_inode = 0; | |
1127 | ||
1128 | if (inode->i_nlink == 0) | |
1129 | return -ENOENT; | |
1130 | ||
1131 | inc_nlink(inode); | |
1132 | mutex_lock(&root->fs_info->fs_mutex); | |
1133 | trans = btrfs_start_transaction(root, 1); | |
1134 | btrfs_set_trans_block_group(trans, dir); | |
1135 | atomic_inc(&inode->i_count); | |
1136 | err = btrfs_add_nondir(trans, dentry, inode); | |
1137 | if (err) | |
1138 | drop_inode = 1; | |
1139 | dir->i_sb->s_dirt = 1; | |
1140 | btrfs_update_inode_block_group(trans, dir); | |
1141 | btrfs_update_inode(trans, root, inode); | |
1142 | ||
1143 | btrfs_end_transaction(trans, root); | |
1144 | mutex_unlock(&root->fs_info->fs_mutex); | |
1145 | ||
1146 | if (drop_inode) { | |
1147 | inode_dec_link_count(inode); | |
1148 | iput(inode); | |
1149 | } | |
1150 | btrfs_btree_balance_dirty(root); | |
1151 | return err; | |
1152 | } | |
1153 | ||
f7922033 | 1154 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
2619ba1f CM |
1155 | struct btrfs_root *root, |
1156 | u64 objectid, u64 dirid) | |
f7922033 | 1157 | { |
f7922033 CM |
1158 | int ret; |
1159 | char buf[2]; | |
d6e4a428 CM |
1160 | struct btrfs_key key; |
1161 | ||
f7922033 CM |
1162 | buf[0] = '.'; |
1163 | buf[1] = '.'; | |
1164 | ||
2619ba1f | 1165 | key.objectid = objectid; |
d6e4a428 CM |
1166 | key.offset = 0; |
1167 | key.flags = 0; | |
1168 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1169 | ||
2619ba1f | 1170 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
fabb5681 | 1171 | &key, BTRFS_FT_DIR); |
f7922033 CM |
1172 | if (ret) |
1173 | goto error; | |
2619ba1f CM |
1174 | key.objectid = dirid; |
1175 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
fabb5681 | 1176 | &key, BTRFS_FT_DIR); |
4730a4bc CM |
1177 | if (ret) |
1178 | goto error; | |
f7922033 CM |
1179 | error: |
1180 | return ret; | |
1181 | } | |
1182 | ||
1183 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1184 | { | |
1185 | struct inode *inode; | |
1186 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 1187 | struct btrfs_root *root = BTRFS_I(dir)->root; |
f7922033 CM |
1188 | int err = 0; |
1189 | int drop_on_err = 0; | |
2619ba1f | 1190 | u64 objectid; |
f7922033 CM |
1191 | |
1192 | mutex_lock(&root->fs_info->fs_mutex); | |
1193 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1194 | btrfs_set_trans_block_group(trans, dir); |
f7922033 CM |
1195 | if (IS_ERR(trans)) { |
1196 | err = PTR_ERR(trans); | |
1197 | goto out_unlock; | |
1198 | } | |
2619ba1f CM |
1199 | |
1200 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1201 | if (err) { | |
1202 | err = -ENOSPC; | |
1203 | goto out_unlock; | |
1204 | } | |
1205 | ||
31f3c99b CM |
1206 | inode = btrfs_new_inode(trans, root, objectid, |
1207 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
f7922033 CM |
1208 | if (IS_ERR(inode)) { |
1209 | err = PTR_ERR(inode); | |
1210 | goto out_fail; | |
1211 | } | |
1212 | drop_on_err = 1; | |
1213 | inode->i_op = &btrfs_dir_inode_operations; | |
1214 | inode->i_fop = &btrfs_dir_file_operations; | |
31f3c99b | 1215 | btrfs_set_trans_block_group(trans, inode); |
f7922033 | 1216 | |
2619ba1f CM |
1217 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
1218 | if (err) | |
1219 | goto out_fail; | |
1220 | ||
1221 | inode->i_size = 6; | |
1222 | err = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
1223 | if (err) |
1224 | goto out_fail; | |
1225 | err = btrfs_add_link(trans, dentry, inode); | |
1226 | if (err) | |
1227 | goto out_fail; | |
1228 | d_instantiate(dentry, inode); | |
f7922033 | 1229 | drop_on_err = 0; |
cd1bc465 | 1230 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
1231 | btrfs_update_inode_block_group(trans, inode); |
1232 | btrfs_update_inode_block_group(trans, dir); | |
f7922033 CM |
1233 | |
1234 | out_fail: | |
1235 | btrfs_end_transaction(trans, root); | |
1236 | out_unlock: | |
1237 | mutex_unlock(&root->fs_info->fs_mutex); | |
1238 | if (drop_on_err) | |
1239 | iput(inode); | |
35b7e476 | 1240 | btrfs_btree_balance_dirty(root); |
f7922033 CM |
1241 | return err; |
1242 | } | |
1243 | ||
8fd17795 CM |
1244 | static int btrfs_sync_file(struct file *file, |
1245 | struct dentry *dentry, int datasync) | |
1246 | { | |
1247 | struct inode *inode = dentry->d_inode; | |
1248 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1249 | int ret; | |
1250 | struct btrfs_trans_handle *trans; | |
1251 | ||
1252 | mutex_lock(&root->fs_info->fs_mutex); | |
1253 | trans = btrfs_start_transaction(root, 1); | |
1254 | if (!trans) { | |
1255 | ret = -ENOMEM; | |
1256 | goto out; | |
1257 | } | |
1258 | ret = btrfs_commit_transaction(trans, root); | |
1259 | mutex_unlock(&root->fs_info->fs_mutex); | |
1260 | out: | |
1261 | return ret > 0 ? EIO : ret; | |
1262 | } | |
1263 | ||
d5719762 CM |
1264 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
1265 | { | |
1266 | struct btrfs_trans_handle *trans; | |
1267 | struct btrfs_root *root; | |
1268 | int ret; | |
d98237b3 | 1269 | root = btrfs_sb(sb); |
df2ce34c | 1270 | |
d5719762 | 1271 | sb->s_dirt = 0; |
d561c025 | 1272 | if (!wait) { |
7cfcc17e | 1273 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
1274 | return 0; |
1275 | } | |
d561c025 | 1276 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
1277 | trans = btrfs_start_transaction(root, 1); |
1278 | ret = btrfs_commit_transaction(trans, root); | |
1279 | sb->s_dirt = 0; | |
1280 | BUG_ON(ret); | |
1281 | printk("btrfs sync_fs\n"); | |
d561c025 | 1282 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
1283 | return 0; |
1284 | } | |
1285 | ||
fabb5681 CM |
1286 | #define BTRFS_GET_BLOCK_NO_CREATE 0 |
1287 | #define BTRFS_GET_BLOCK_CREATE 1 | |
1288 | #define BTRFS_GET_BLOCK_NO_DIRECT 2 | |
1289 | ||
75dfe396 | 1290 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
1291 | struct buffer_head *result, int create) |
1292 | { | |
1293 | int ret; | |
1294 | int err = 0; | |
1295 | u64 blocknr; | |
1296 | u64 extent_start = 0; | |
1297 | u64 extent_end = 0; | |
1298 | u64 objectid = inode->i_ino; | |
236454df | 1299 | u32 found_type; |
1de037a4 | 1300 | u64 alloc_hint = 0; |
5caf2a00 | 1301 | struct btrfs_path *path; |
d6e4a428 | 1302 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dee26a9f CM |
1303 | struct btrfs_file_extent_item *item; |
1304 | struct btrfs_leaf *leaf; | |
1305 | struct btrfs_disk_key *found_key; | |
1de037a4 | 1306 | struct btrfs_trans_handle *trans = NULL; |
dee26a9f | 1307 | |
5caf2a00 CM |
1308 | path = btrfs_alloc_path(); |
1309 | BUG_ON(!path); | |
1310 | btrfs_init_path(path); | |
fabb5681 | 1311 | if (create & BTRFS_GET_BLOCK_CREATE) { |
6567e837 | 1312 | WARN_ON(1); |
1de037a4 CM |
1313 | /* this almost but not quite works */ |
1314 | trans = btrfs_start_transaction(root, 1); | |
1315 | if (!trans) { | |
1316 | err = -ENOMEM; | |
1317 | goto out; | |
1318 | } | |
1319 | ret = drop_extents(trans, root, inode, | |
1320 | iblock << inode->i_blkbits, | |
1321 | (iblock + 1) << inode->i_blkbits, | |
1322 | &alloc_hint); | |
1323 | BUG_ON(ret); | |
6567e837 | 1324 | } |
dee26a9f | 1325 | |
236454df | 1326 | ret = btrfs_lookup_file_extent(NULL, root, path, |
9773a788 | 1327 | inode->i_ino, |
236454df | 1328 | iblock << inode->i_blkbits, 0); |
dee26a9f | 1329 | if (ret < 0) { |
dee26a9f CM |
1330 | err = ret; |
1331 | goto out; | |
1332 | } | |
1333 | ||
1334 | if (ret != 0) { | |
5caf2a00 CM |
1335 | if (path->slots[0] == 0) { |
1336 | btrfs_release_path(root, path); | |
1de037a4 | 1337 | goto not_found; |
dee26a9f | 1338 | } |
5caf2a00 | 1339 | path->slots[0]--; |
dee26a9f CM |
1340 | } |
1341 | ||
5caf2a00 | 1342 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 1343 | struct btrfs_file_extent_item); |
5caf2a00 | 1344 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
1345 | blocknr = btrfs_file_extent_disk_blocknr(item); |
1346 | blocknr += btrfs_file_extent_offset(item); | |
1347 | ||
dee26a9f | 1348 | /* are we inside the extent that was found? */ |
5caf2a00 | 1349 | found_key = &leaf->items[path->slots[0]].key; |
236454df | 1350 | found_type = btrfs_disk_key_type(found_key); |
dee26a9f | 1351 | if (btrfs_disk_key_objectid(found_key) != objectid || |
236454df | 1352 | found_type != BTRFS_EXTENT_DATA_KEY) { |
dee26a9f CM |
1353 | extent_end = 0; |
1354 | extent_start = 0; | |
1de037a4 | 1355 | goto not_found; |
dee26a9f | 1356 | } |
236454df CM |
1357 | found_type = btrfs_file_extent_type(item); |
1358 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1359 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1360 | extent_start = extent_start >> inode->i_blkbits; | |
1361 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
3a686375 | 1362 | err = 0; |
1de037a4 | 1363 | if (btrfs_file_extent_disk_blocknr(item) == 0) |
3a686375 | 1364 | goto out; |
236454df | 1365 | if (iblock >= extent_start && iblock < extent_end) { |
236454df CM |
1366 | btrfs_map_bh_to_logical(root, result, blocknr + |
1367 | iblock - extent_start); | |
1368 | goto out; | |
1369 | } | |
1370 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1371 | char *ptr; | |
1372 | char *map; | |
1373 | u32 size; | |
fabb5681 CM |
1374 | |
1375 | if (create & BTRFS_GET_BLOCK_NO_DIRECT) { | |
1376 | err = -EINVAL; | |
1377 | goto out; | |
1378 | } | |
236454df CM |
1379 | size = btrfs_file_extent_inline_len(leaf->items + |
1380 | path->slots[0]); | |
1381 | extent_end = (extent_start + size) >> inode->i_blkbits; | |
1382 | extent_start >>= inode->i_blkbits; | |
1383 | if (iblock < extent_start || iblock > extent_end) { | |
1de037a4 | 1384 | goto not_found; |
236454df CM |
1385 | } |
1386 | ptr = btrfs_file_extent_inline_start(item); | |
1387 | map = kmap(result->b_page); | |
1388 | memcpy(map, ptr, size); | |
1389 | memset(map + size, 0, PAGE_CACHE_SIZE - size); | |
1390 | flush_dcache_page(result->b_page); | |
1391 | kunmap(result->b_page); | |
1392 | set_buffer_uptodate(result); | |
1393 | SetPageChecked(result->b_page); | |
1394 | btrfs_map_bh_to_logical(root, result, 0); | |
dee26a9f | 1395 | } |
1de037a4 | 1396 | not_found: |
fabb5681 | 1397 | if (create & BTRFS_GET_BLOCK_CREATE) { |
1de037a4 CM |
1398 | struct btrfs_key ins; |
1399 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, | |
1400 | 1, alloc_hint, (u64)-1, | |
1401 | &ins, 1); | |
1402 | BUG_ON(ret); | |
1403 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
1404 | iblock << inode->i_blkbits, | |
1405 | ins.objectid, ins.offset, | |
1406 | ins.offset); | |
1407 | BUG_ON(ret); | |
1408 | SetPageChecked(result->b_page); | |
1409 | btrfs_map_bh_to_logical(root, result, ins.objectid); | |
1410 | } | |
dee26a9f | 1411 | out: |
1de037a4 CM |
1412 | if (trans) |
1413 | err = btrfs_end_transaction(trans, root); | |
5caf2a00 | 1414 | btrfs_free_path(path); |
75dfe396 CM |
1415 | return err; |
1416 | } | |
1417 | ||
1418 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1419 | struct buffer_head *result, int create) | |
1420 | { | |
1421 | int err; | |
d6e4a428 | 1422 | struct btrfs_root *root = BTRFS_I(inode)->root; |
75dfe396 | 1423 | mutex_lock(&root->fs_info->fs_mutex); |
e8f05c45 | 1424 | err = btrfs_get_block_lock(inode, iblock, result, create); |
dee26a9f CM |
1425 | mutex_unlock(&root->fs_info->fs_mutex); |
1426 | return err; | |
1427 | } | |
1428 | ||
fabb5681 CM |
1429 | static int btrfs_get_block_bmap(struct inode *inode, sector_t iblock, |
1430 | struct buffer_head *result, int create) | |
1431 | { | |
1432 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1433 | mutex_lock(&root->fs_info->fs_mutex); | |
1434 | btrfs_get_block_lock(inode, iblock, result, BTRFS_GET_BLOCK_NO_DIRECT); | |
1435 | mutex_unlock(&root->fs_info->fs_mutex); | |
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | static sector_t btrfs_bmap(struct address_space *as, sector_t block) | |
1440 | { | |
1441 | return generic_block_bmap(as, block, btrfs_get_block_bmap); | |
1442 | } | |
1443 | ||
dee26a9f CM |
1444 | static int btrfs_prepare_write(struct file *file, struct page *page, |
1445 | unsigned from, unsigned to) | |
1446 | { | |
1de037a4 | 1447 | return block_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f CM |
1448 | } |
1449 | ||
d561c025 CM |
1450 | static void btrfs_write_super(struct super_block *sb) |
1451 | { | |
08607c1b | 1452 | sb->s_dirt = 0; |
d561c025 CM |
1453 | } |
1454 | ||
dee26a9f CM |
1455 | static int btrfs_readpage(struct file *file, struct page *page) |
1456 | { | |
1457 | return mpage_readpage(page, btrfs_get_block); | |
1458 | } | |
1459 | ||
236454df CM |
1460 | /* |
1461 | * While block_write_full_page is writing back the dirty buffers under | |
1462 | * the page lock, whoever dirtied the buffers may decide to clean them | |
1463 | * again at any time. We handle that by only looking at the buffer | |
1464 | * state inside lock_buffer(). | |
1465 | * | |
1466 | * If block_write_full_page() is called for regular writeback | |
1467 | * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a | |
1468 | * locked buffer. This only can happen if someone has written the buffer | |
1469 | * directly, with submit_bh(). At the address_space level PageWriteback | |
1470 | * prevents this contention from occurring. | |
1471 | */ | |
1472 | static int __btrfs_write_full_page(struct inode *inode, struct page *page, | |
1473 | struct writeback_control *wbc) | |
1474 | { | |
1475 | int err; | |
1476 | sector_t block; | |
1477 | sector_t last_block; | |
1478 | struct buffer_head *bh, *head; | |
1479 | const unsigned blocksize = 1 << inode->i_blkbits; | |
1480 | int nr_underway = 0; | |
1481 | ||
1482 | BUG_ON(!PageLocked(page)); | |
1483 | ||
1484 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; | |
1485 | ||
1486 | if (!page_has_buffers(page)) { | |
1487 | create_empty_buffers(page, blocksize, | |
1488 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
1489 | } | |
1490 | ||
1491 | /* | |
1492 | * Be very careful. We have no exclusion from __set_page_dirty_buffers | |
1493 | * here, and the (potentially unmapped) buffers may become dirty at | |
1494 | * any time. If a buffer becomes dirty here after we've inspected it | |
1495 | * then we just miss that fact, and the page stays dirty. | |
1496 | * | |
1497 | * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; | |
1498 | * handle that here by just cleaning them. | |
1499 | */ | |
1500 | ||
1501 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1502 | head = page_buffers(page); | |
1503 | bh = head; | |
1504 | ||
1505 | /* | |
1506 | * Get all the dirty buffers mapped to disk addresses and | |
1507 | * handle any aliases from the underlying blockdev's mapping. | |
1508 | */ | |
1509 | do { | |
1510 | if (block > last_block) { | |
1511 | /* | |
1512 | * mapped buffers outside i_size will occur, because | |
1513 | * this page can be outside i_size when there is a | |
1514 | * truncate in progress. | |
1515 | */ | |
1516 | /* | |
1517 | * The buffer was zeroed by block_write_full_page() | |
1518 | */ | |
1519 | clear_buffer_dirty(bh); | |
1520 | set_buffer_uptodate(bh); | |
1521 | } else if (!buffer_mapped(bh) && buffer_dirty(bh)) { | |
1522 | WARN_ON(bh->b_size != blocksize); | |
1523 | err = btrfs_get_block(inode, block, bh, 0); | |
35b7e476 CM |
1524 | if (err) { |
1525 | printk("writepage going to recovery err %d\n", err); | |
236454df | 1526 | goto recover; |
35b7e476 | 1527 | } |
236454df CM |
1528 | if (buffer_new(bh)) { |
1529 | /* blockdev mappings never come here */ | |
1530 | clear_buffer_new(bh); | |
236454df CM |
1531 | } |
1532 | } | |
1533 | bh = bh->b_this_page; | |
1534 | block++; | |
1535 | } while (bh != head); | |
1536 | ||
1537 | do { | |
1538 | if (!buffer_mapped(bh)) | |
1539 | continue; | |
1540 | /* | |
1541 | * If it's a fully non-blocking write attempt and we cannot | |
1542 | * lock the buffer then redirty the page. Note that this can | |
1543 | * potentially cause a busy-wait loop from pdflush and kswapd | |
1544 | * activity, but those code paths have their own higher-level | |
1545 | * throttling. | |
1546 | */ | |
1547 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
1548 | lock_buffer(bh); | |
1549 | } else if (test_set_buffer_locked(bh)) { | |
1550 | redirty_page_for_writepage(wbc, page); | |
1551 | continue; | |
1552 | } | |
1553 | if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) { | |
1554 | mark_buffer_async_write(bh); | |
1555 | } else { | |
1556 | unlock_buffer(bh); | |
1557 | } | |
1558 | } while ((bh = bh->b_this_page) != head); | |
1559 | ||
1560 | /* | |
1561 | * The page and its buffers are protected by PageWriteback(), so we can | |
1562 | * drop the bh refcounts early. | |
1563 | */ | |
1564 | BUG_ON(PageWriteback(page)); | |
1565 | set_page_writeback(page); | |
1566 | ||
1567 | do { | |
1568 | struct buffer_head *next = bh->b_this_page; | |
1569 | if (buffer_async_write(bh)) { | |
1570 | submit_bh(WRITE, bh); | |
1571 | nr_underway++; | |
1572 | } | |
1573 | bh = next; | |
1574 | } while (bh != head); | |
1575 | unlock_page(page); | |
1576 | ||
1577 | err = 0; | |
1578 | done: | |
1579 | if (nr_underway == 0) { | |
1580 | /* | |
1581 | * The page was marked dirty, but the buffers were | |
1582 | * clean. Someone wrote them back by hand with | |
1583 | * ll_rw_block/submit_bh. A rare case. | |
1584 | */ | |
1585 | int uptodate = 1; | |
1586 | do { | |
1587 | if (!buffer_uptodate(bh)) { | |
1588 | uptodate = 0; | |
1589 | break; | |
1590 | } | |
1591 | bh = bh->b_this_page; | |
1592 | } while (bh != head); | |
1593 | if (uptodate) | |
1594 | SetPageUptodate(page); | |
1595 | end_page_writeback(page); | |
236454df CM |
1596 | } |
1597 | return err; | |
1598 | ||
1599 | recover: | |
1600 | /* | |
1601 | * ENOSPC, or some other error. We may already have added some | |
1602 | * blocks to the file, so we need to write these out to avoid | |
1603 | * exposing stale data. | |
1604 | * The page is currently locked and not marked for writeback | |
1605 | */ | |
1606 | bh = head; | |
1607 | /* Recovery: lock and submit the mapped buffers */ | |
1608 | do { | |
1609 | if (buffer_mapped(bh) && buffer_dirty(bh)) { | |
1610 | lock_buffer(bh); | |
1611 | mark_buffer_async_write(bh); | |
1612 | } else { | |
1613 | /* | |
1614 | * The buffer may have been set dirty during | |
1615 | * attachment to a dirty page. | |
1616 | */ | |
1617 | clear_buffer_dirty(bh); | |
1618 | } | |
1619 | } while ((bh = bh->b_this_page) != head); | |
1620 | SetPageError(page); | |
1621 | BUG_ON(PageWriteback(page)); | |
1622 | set_page_writeback(page); | |
1623 | do { | |
1624 | struct buffer_head *next = bh->b_this_page; | |
1625 | if (buffer_async_write(bh)) { | |
1626 | clear_buffer_dirty(bh); | |
1627 | submit_bh(WRITE, bh); | |
1628 | nr_underway++; | |
1629 | } | |
1630 | bh = next; | |
1631 | } while (bh != head); | |
1632 | unlock_page(page); | |
1633 | goto done; | |
1634 | } | |
1635 | ||
1636 | /* | |
1637 | * The generic ->writepage function for buffer-backed address_spaces | |
1638 | */ | |
dee26a9f CM |
1639 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
1640 | { | |
236454df CM |
1641 | struct inode * const inode = page->mapping->host; |
1642 | loff_t i_size = i_size_read(inode); | |
1643 | const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
1644 | unsigned offset; | |
1645 | void *kaddr; | |
1646 | ||
1647 | /* Is the page fully inside i_size? */ | |
1648 | if (page->index < end_index) | |
1649 | return __btrfs_write_full_page(inode, page, wbc); | |
1650 | ||
1651 | /* Is the page fully outside i_size? (truncate in progress) */ | |
1652 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
1653 | if (page->index >= end_index+1 || !offset) { | |
1654 | /* | |
1655 | * The page may have dirty, unmapped buffers. For example, | |
1656 | * they may have been added in ext3_writepage(). Make them | |
1657 | * freeable here, so the page does not leak. | |
1658 | */ | |
1659 | block_invalidatepage(page, 0); | |
1660 | unlock_page(page); | |
1661 | return 0; /* don't care */ | |
1662 | } | |
1663 | ||
1664 | /* | |
1665 | * The page straddles i_size. It must be zeroed out on each and every | |
1666 | * writepage invokation because it may be mmapped. "A file is mapped | |
1667 | * in multiples of the page size. For a file that is not a multiple of | |
1668 | * the page size, the remaining memory is zeroed when mapped, and | |
1669 | * writes to that region are not written out to the file." | |
1670 | */ | |
1671 | kaddr = kmap_atomic(page, KM_USER0); | |
1672 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1673 | flush_dcache_page(page); | |
1674 | kunmap_atomic(kaddr, KM_USER0); | |
1675 | return __btrfs_write_full_page(inode, page, wbc); | |
dee26a9f | 1676 | } |
d561c025 | 1677 | |
f4b9aa8d CM |
1678 | static void btrfs_truncate(struct inode *inode) |
1679 | { | |
d6e4a428 | 1680 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
1681 | int ret; |
1682 | struct btrfs_trans_handle *trans; | |
1683 | ||
1684 | if (!S_ISREG(inode->i_mode)) | |
1685 | return; | |
1686 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1687 | return; | |
1688 | ||
1de037a4 | 1689 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d | 1690 | |
f4b9aa8d CM |
1691 | mutex_lock(&root->fs_info->fs_mutex); |
1692 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1693 | btrfs_set_trans_block_group(trans, inode); |
1de037a4 CM |
1694 | |
1695 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
f4b9aa8d CM |
1696 | ret = btrfs_truncate_in_trans(trans, root, inode); |
1697 | BUG_ON(ret); | |
35b7e476 | 1698 | btrfs_update_inode(trans, root, inode); |
f4b9aa8d CM |
1699 | ret = btrfs_end_transaction(trans, root); |
1700 | BUG_ON(ret); | |
1701 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 1702 | btrfs_btree_balance_dirty(root); |
f4b9aa8d CM |
1703 | } |
1704 | ||
236454df CM |
1705 | static int btrfs_commit_write(struct file *file, struct page *page, |
1706 | unsigned from, unsigned to) | |
1707 | { | |
1708 | struct inode *inode = page->mapping->host; | |
1709 | struct buffer_head *bh; | |
1710 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1711 | ||
1712 | SetPageUptodate(page); | |
1713 | bh = page_buffers(page); | |
1de037a4 | 1714 | set_buffer_uptodate(bh); |
236454df CM |
1715 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { |
1716 | set_page_dirty(page); | |
1717 | } | |
1718 | if (pos > inode->i_size) { | |
1719 | i_size_write(inode, pos); | |
1720 | mark_inode_dirty(inode); | |
1721 | } | |
1722 | return 0; | |
1723 | } | |
1724 | ||
75dfe396 CM |
1725 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1726 | struct page **prepared_pages, | |
1727 | const char __user * buf) | |
1728 | { | |
1729 | long page_fault = 0; | |
1730 | int i; | |
1731 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1732 | ||
1733 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1734 | size_t count = min_t(size_t, | |
1735 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1736 | struct page *page = prepared_pages[i]; | |
1737 | fault_in_pages_readable(buf, count); | |
1738 | ||
1739 | /* Copy data from userspace to the current page */ | |
1740 | kmap(page); | |
1741 | page_fault = __copy_from_user(page_address(page) + offset, | |
1742 | buf, count); | |
1743 | /* Flush processor's dcache for this page */ | |
1744 | flush_dcache_page(page); | |
1745 | kunmap(page); | |
1746 | buf += count; | |
1747 | write_bytes -= count; | |
1748 | ||
1749 | if (page_fault) | |
1750 | break; | |
1751 | } | |
1752 | return page_fault ? -EFAULT : 0; | |
1753 | } | |
1754 | ||
1755 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1756 | { | |
1757 | size_t i; | |
1758 | for (i = 0; i < num_pages; i++) { | |
1759 | if (!pages[i]) | |
1760 | break; | |
1761 | unlock_page(pages[i]); | |
1762 | mark_page_accessed(pages[i]); | |
1763 | page_cache_release(pages[i]); | |
1764 | } | |
1765 | } | |
1766 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1767 | struct btrfs_root *root, | |
1768 | struct file *file, | |
1769 | struct page **pages, | |
1770 | size_t num_pages, | |
1771 | loff_t pos, | |
1772 | size_t write_bytes) | |
1773 | { | |
1774 | int i; | |
1775 | int offset; | |
1776 | int err = 0; | |
1777 | int ret; | |
1778 | int this_write; | |
f254e52c | 1779 | struct inode *inode = file->f_path.dentry->d_inode; |
236454df CM |
1780 | struct buffer_head *bh; |
1781 | struct btrfs_file_extent_item *ei; | |
75dfe396 CM |
1782 | |
1783 | for (i = 0; i < num_pages; i++) { | |
1784 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1785 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1786 | /* FIXME, one block at a time */ |
1787 | ||
1788 | mutex_lock(&root->fs_info->fs_mutex); | |
1789 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1790 | btrfs_set_trans_block_group(trans, inode); |
236454df CM |
1791 | |
1792 | bh = page_buffers(pages[i]); | |
1793 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
1794 | struct btrfs_key key; | |
1795 | struct btrfs_path *path; | |
1796 | char *ptr; | |
1797 | u32 datasize; | |
1798 | ||
1799 | path = btrfs_alloc_path(); | |
1800 | BUG_ON(!path); | |
1801 | key.objectid = inode->i_ino; | |
1802 | key.offset = pages[i]->index << PAGE_CACHE_SHIFT; | |
1803 | key.flags = 0; | |
1804 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
1805 | BUG_ON(write_bytes >= PAGE_CACHE_SIZE); | |
1806 | datasize = offset + | |
1807 | btrfs_file_extent_calc_inline_size(write_bytes); | |
1808 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1809 | datasize); | |
1810 | BUG_ON(ret); | |
1811 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1812 | path->slots[0], struct btrfs_file_extent_item); | |
1813 | btrfs_set_file_extent_generation(ei, trans->transid); | |
1814 | btrfs_set_file_extent_type(ei, | |
1815 | BTRFS_FILE_EXTENT_INLINE); | |
1816 | ptr = btrfs_file_extent_inline_start(ei); | |
098f59c2 CM |
1817 | btrfs_memcpy(root, path->nodes[0]->b_data, |
1818 | ptr, bh->b_data, offset + write_bytes); | |
236454df CM |
1819 | mark_buffer_dirty(path->nodes[0]); |
1820 | btrfs_free_path(path); | |
3a686375 | 1821 | } else if (buffer_mapped(bh)) { |
236454df | 1822 | btrfs_csum_file_block(trans, root, inode->i_ino, |
f254e52c CM |
1823 | pages[i]->index << PAGE_CACHE_SHIFT, |
1824 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
236454df CM |
1825 | kunmap(pages[i]); |
1826 | } | |
f254e52c | 1827 | SetPageChecked(pages[i]); |
e37c9e69 | 1828 | // btrfs_update_inode_block_group(trans, inode); |
f254e52c CM |
1829 | ret = btrfs_end_transaction(trans, root); |
1830 | BUG_ON(ret); | |
1831 | mutex_unlock(&root->fs_info->fs_mutex); | |
1832 | ||
236454df | 1833 | ret = btrfs_commit_write(file, pages[i], offset, |
75dfe396 CM |
1834 | offset + this_write); |
1835 | pos += this_write; | |
1836 | if (ret) { | |
1837 | err = ret; | |
1838 | goto failed; | |
1839 | } | |
1840 | WARN_ON(this_write > write_bytes); | |
1841 | write_bytes -= this_write; | |
1842 | } | |
1843 | failed: | |
1844 | return err; | |
1845 | } | |
1846 | ||
b18c6685 CM |
1847 | static int drop_extents(struct btrfs_trans_handle *trans, |
1848 | struct btrfs_root *root, | |
1849 | struct inode *inode, | |
de428b63 | 1850 | u64 start, u64 end, u64 *hint_block) |
b18c6685 CM |
1851 | { |
1852 | int ret; | |
1853 | struct btrfs_key key; | |
1854 | struct btrfs_leaf *leaf; | |
1855 | int slot; | |
1856 | struct btrfs_file_extent_item *extent; | |
236454df | 1857 | u64 extent_end = 0; |
b18c6685 CM |
1858 | int keep; |
1859 | struct btrfs_file_extent_item old; | |
1860 | struct btrfs_path *path; | |
1861 | u64 search_start = start; | |
1862 | int bookend; | |
236454df CM |
1863 | int found_type; |
1864 | int found_extent; | |
1865 | int found_inline; | |
1866 | ||
b18c6685 CM |
1867 | path = btrfs_alloc_path(); |
1868 | if (!path) | |
1869 | return -ENOMEM; | |
a429e513 CM |
1870 | while(1) { |
1871 | btrfs_release_path(root, path); | |
1872 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
1873 | search_start, -1); | |
1874 | if (ret < 0) | |
70b2befd | 1875 | goto out; |
a429e513 CM |
1876 | if (ret > 0) { |
1877 | if (path->slots[0] == 0) { | |
236454df | 1878 | ret = 0; |
a429e513 CM |
1879 | goto out; |
1880 | } | |
1881 | path->slots[0]--; | |
70b2befd | 1882 | } |
b18c6685 CM |
1883 | keep = 0; |
1884 | bookend = 0; | |
236454df CM |
1885 | found_extent = 0; |
1886 | found_inline = 0; | |
1887 | extent = NULL; | |
b18c6685 CM |
1888 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
1889 | slot = path->slots[0]; | |
1890 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
b18c6685 CM |
1891 | if (key.offset >= end || key.objectid != inode->i_ino) { |
1892 | ret = 0; | |
1893 | goto out; | |
1894 | } | |
236454df CM |
1895 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) { |
1896 | ret = 0; | |
1897 | goto out; | |
1898 | } | |
1899 | extent = btrfs_item_ptr(leaf, slot, | |
1900 | struct btrfs_file_extent_item); | |
1901 | found_type = btrfs_file_extent_type(extent); | |
1902 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1903 | extent_end = key.offset + | |
1904 | (btrfs_file_extent_num_blocks(extent) << | |
1905 | inode->i_blkbits); | |
1906 | found_extent = 1; | |
1907 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1908 | found_inline = 1; | |
1909 | extent_end = key.offset + | |
1910 | btrfs_file_extent_inline_len(leaf->items + slot); | |
1911 | } | |
1912 | ||
1913 | if (!found_extent && !found_inline) { | |
1914 | ret = 0; | |
a429e513 | 1915 | goto out; |
236454df CM |
1916 | } |
1917 | ||
1918 | if (search_start >= extent_end) { | |
1919 | ret = 0; | |
a429e513 | 1920 | goto out; |
236454df CM |
1921 | } |
1922 | ||
3a686375 CM |
1923 | if (found_inline) { |
1924 | u64 mask = root->blocksize - 1; | |
1925 | search_start = (extent_end + mask) & ~mask; | |
1926 | } else | |
1927 | search_start = extent_end; | |
b18c6685 CM |
1928 | |
1929 | if (end < extent_end && end >= key.offset) { | |
236454df | 1930 | if (found_extent) { |
3a686375 CM |
1931 | u64 disk_blocknr = |
1932 | btrfs_file_extent_disk_blocknr(extent); | |
1933 | u64 disk_num_blocks = | |
1934 | btrfs_file_extent_disk_num_blocks(extent); | |
236454df | 1935 | memcpy(&old, extent, sizeof(old)); |
3a686375 CM |
1936 | if (disk_blocknr != 0) { |
1937 | ret = btrfs_inc_extent_ref(trans, root, | |
1938 | disk_blocknr, disk_num_blocks); | |
1939 | BUG_ON(ret); | |
1940 | } | |
236454df CM |
1941 | } |
1942 | WARN_ON(found_inline); | |
b18c6685 CM |
1943 | bookend = 1; |
1944 | } | |
1945 | ||
1946 | if (start > key.offset) { | |
1947 | u64 new_num; | |
a429e513 | 1948 | u64 old_num; |
b18c6685 CM |
1949 | /* truncate existing extent */ |
1950 | keep = 1; | |
1951 | WARN_ON(start & (root->blocksize - 1)); | |
236454df CM |
1952 | if (found_extent) { |
1953 | new_num = (start - key.offset) >> | |
1954 | inode->i_blkbits; | |
1955 | old_num = btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1956 | *hint_block = |
1957 | btrfs_file_extent_disk_blocknr(extent); | |
3a686375 CM |
1958 | if (btrfs_file_extent_disk_blocknr(extent)) { |
1959 | inode->i_blocks -= | |
1960 | (old_num - new_num) << 3; | |
1961 | } | |
236454df CM |
1962 | btrfs_set_file_extent_num_blocks(extent, |
1963 | new_num); | |
1964 | mark_buffer_dirty(path->nodes[0]); | |
1965 | } else { | |
1966 | WARN_ON(1); | |
236454df | 1967 | } |
b18c6685 CM |
1968 | } |
1969 | if (!keep) { | |
236454df CM |
1970 | u64 disk_blocknr = 0; |
1971 | u64 disk_num_blocks = 0; | |
1972 | u64 extent_num_blocks = 0; | |
1973 | if (found_extent) { | |
1974 | disk_blocknr = | |
1975 | btrfs_file_extent_disk_blocknr(extent); | |
1976 | disk_num_blocks = | |
1977 | btrfs_file_extent_disk_num_blocks(extent); | |
1978 | extent_num_blocks = | |
1979 | btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1980 | *hint_block = |
1981 | btrfs_file_extent_disk_blocknr(extent); | |
236454df | 1982 | } |
b18c6685 CM |
1983 | ret = btrfs_del_item(trans, root, path); |
1984 | BUG_ON(ret); | |
1985 | btrfs_release_path(root, path); | |
098f59c2 | 1986 | extent = NULL; |
3a686375 | 1987 | if (found_extent && disk_blocknr != 0) { |
098f59c2 | 1988 | inode->i_blocks -= extent_num_blocks << 3; |
236454df CM |
1989 | ret = btrfs_free_extent(trans, root, |
1990 | disk_blocknr, | |
1991 | disk_num_blocks, 0); | |
1992 | } | |
b18c6685 CM |
1993 | |
1994 | BUG_ON(ret); | |
1995 | if (!bookend && search_start >= end) { | |
1996 | ret = 0; | |
1997 | goto out; | |
1998 | } | |
1999 | if (!bookend) | |
a429e513 | 2000 | continue; |
b18c6685 | 2001 | } |
236454df | 2002 | if (bookend && found_extent) { |
b18c6685 CM |
2003 | /* create bookend */ |
2004 | struct btrfs_key ins; | |
b18c6685 CM |
2005 | ins.objectid = inode->i_ino; |
2006 | ins.offset = end; | |
2007 | ins.flags = 0; | |
2008 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); | |
2009 | ||
2010 | btrfs_release_path(root, path); | |
b18c6685 CM |
2011 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
2012 | sizeof(*extent)); | |
2013 | BUG_ON(ret); | |
2014 | extent = btrfs_item_ptr( | |
2015 | btrfs_buffer_leaf(path->nodes[0]), | |
2016 | path->slots[0], | |
2017 | struct btrfs_file_extent_item); | |
2018 | btrfs_set_file_extent_disk_blocknr(extent, | |
2019 | btrfs_file_extent_disk_blocknr(&old)); | |
2020 | btrfs_set_file_extent_disk_num_blocks(extent, | |
2021 | btrfs_file_extent_disk_num_blocks(&old)); | |
2022 | ||
2023 | btrfs_set_file_extent_offset(extent, | |
2024 | btrfs_file_extent_offset(&old) + | |
2025 | ((end - key.offset) >> inode->i_blkbits)); | |
2026 | WARN_ON(btrfs_file_extent_num_blocks(&old) < | |
3a686375 | 2027 | (extent_end - end) >> inode->i_blkbits); |
b18c6685 | 2028 | btrfs_set_file_extent_num_blocks(extent, |
3a686375 | 2029 | (extent_end - end) >> inode->i_blkbits); |
b18c6685 | 2030 | |
236454df CM |
2031 | btrfs_set_file_extent_type(extent, |
2032 | BTRFS_FILE_EXTENT_REG); | |
b18c6685 CM |
2033 | btrfs_set_file_extent_generation(extent, |
2034 | btrfs_file_extent_generation(&old)); | |
b18c6685 | 2035 | btrfs_mark_buffer_dirty(path->nodes[0]); |
3a686375 CM |
2036 | if (btrfs_file_extent_disk_blocknr(&old) != 0) { |
2037 | inode->i_blocks += | |
2038 | btrfs_file_extent_num_blocks(extent) << 3; | |
2039 | } | |
b18c6685 | 2040 | ret = 0; |
70b2befd | 2041 | goto out; |
b18c6685 | 2042 | } |
b18c6685 | 2043 | } |
b18c6685 | 2044 | out: |
b18c6685 CM |
2045 | btrfs_free_path(path); |
2046 | return ret; | |
2047 | } | |
2048 | ||
2049 | static int prepare_pages(struct btrfs_root *root, | |
75dfe396 CM |
2050 | struct file *file, |
2051 | struct page **pages, | |
2052 | size_t num_pages, | |
2053 | loff_t pos, | |
2932f3ec CM |
2054 | unsigned long first_index, |
2055 | unsigned long last_index, | |
6567e837 CM |
2056 | size_t write_bytes, |
2057 | u64 alloc_extent_start) | |
75dfe396 CM |
2058 | { |
2059 | int i; | |
2060 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
2061 | struct inode *inode = file->f_path.dentry->d_inode; | |
2062 | int offset; | |
2063 | int err = 0; | |
75dfe396 | 2064 | int this_write; |
6567e837 CM |
2065 | struct buffer_head *bh; |
2066 | struct buffer_head *head; | |
75dfe396 CM |
2067 | loff_t isize = i_size_read(inode); |
2068 | ||
2069 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
2070 | ||
2071 | for (i = 0; i < num_pages; i++) { | |
2072 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
2073 | if (!pages[i]) { | |
2074 | err = -ENOMEM; | |
2075 | goto failed_release; | |
2076 | } | |
35b7e476 CM |
2077 | cancel_dirty_page(pages[i], PAGE_CACHE_SIZE); |
2078 | wait_on_page_writeback(pages[i]); | |
75dfe396 CM |
2079 | offset = pos & (PAGE_CACHE_SIZE -1); |
2080 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
35b7e476 CM |
2081 | if (!page_has_buffers(pages[i])) { |
2082 | create_empty_buffers(pages[i], | |
2083 | root->fs_info->sb->s_blocksize, | |
2084 | (1 << BH_Uptodate)); | |
2085 | } | |
6567e837 CM |
2086 | head = page_buffers(pages[i]); |
2087 | bh = head; | |
2088 | do { | |
2089 | err = btrfs_map_bh_to_logical(root, bh, | |
2090 | alloc_extent_start); | |
2091 | BUG_ON(err); | |
2092 | if (err) | |
2093 | goto failed_truncate; | |
2094 | bh = bh->b_this_page; | |
236454df CM |
2095 | if (alloc_extent_start) |
2096 | alloc_extent_start++; | |
6567e837 | 2097 | } while (bh != head); |
75dfe396 | 2098 | pos += this_write; |
75dfe396 CM |
2099 | WARN_ON(this_write > write_bytes); |
2100 | write_bytes -= this_write; | |
2101 | } | |
2102 | return 0; | |
2103 | ||
2104 | failed_release: | |
2105 | btrfs_drop_pages(pages, num_pages); | |
2106 | return err; | |
2107 | ||
2108 | failed_truncate: | |
2109 | btrfs_drop_pages(pages, num_pages); | |
2110 | if (pos > isize) | |
2111 | vmtruncate(inode, isize); | |
2112 | return err; | |
2113 | } | |
2114 | ||
2115 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
2116 | size_t count, loff_t *ppos) | |
2117 | { | |
2118 | loff_t pos; | |
2119 | size_t num_written = 0; | |
2120 | int err = 0; | |
2121 | int ret = 0; | |
75dfe396 | 2122 | struct inode *inode = file->f_path.dentry->d_inode; |
d6e4a428 | 2123 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b18c6685 | 2124 | struct page *pages[8]; |
35b7e476 | 2125 | struct page *pinned[2]; |
2932f3ec CM |
2126 | unsigned long first_index; |
2127 | unsigned long last_index; | |
6567e837 CM |
2128 | u64 start_pos; |
2129 | u64 num_blocks; | |
2130 | u64 alloc_extent_start; | |
de428b63 | 2131 | u64 hint_block; |
6567e837 | 2132 | struct btrfs_trans_handle *trans; |
b18c6685 | 2133 | struct btrfs_key ins; |
35b7e476 CM |
2134 | pinned[0] = NULL; |
2135 | pinned[1] = NULL; | |
75dfe396 CM |
2136 | if (file->f_flags & O_DIRECT) |
2137 | return -EINVAL; | |
2138 | pos = *ppos; | |
75dfe396 CM |
2139 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
2140 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
2141 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
2142 | if (err) | |
2143 | goto out; | |
2144 | if (count == 0) | |
2145 | goto out; | |
2146 | err = remove_suid(file->f_path.dentry); | |
2147 | if (err) | |
2148 | goto out; | |
2149 | file_update_time(file); | |
a429e513 CM |
2150 | |
2151 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); | |
2152 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> | |
2153 | inode->i_blkbits; | |
2154 | ||
75dfe396 | 2155 | mutex_lock(&inode->i_mutex); |
2932f3ec CM |
2156 | first_index = pos >> PAGE_CACHE_SHIFT; |
2157 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
6567e837 | 2158 | |
1de037a4 | 2159 | if ((pos & (PAGE_CACHE_SIZE - 1))) { |
a429e513 CM |
2160 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); |
2161 | if (!PageUptodate(pinned[0])) { | |
2162 | ret = mpage_readpage(pinned[0], btrfs_get_block); | |
2163 | BUG_ON(ret); | |
35b7e476 | 2164 | wait_on_page_locked(pinned[0]); |
a429e513 CM |
2165 | } else { |
2166 | unlock_page(pinned[0]); | |
2167 | } | |
2168 | } | |
1de037a4 | 2169 | if ((pos + count) & (PAGE_CACHE_SIZE - 1)) { |
a429e513 CM |
2170 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); |
2171 | if (!PageUptodate(pinned[1])) { | |
2172 | ret = mpage_readpage(pinned[1], btrfs_get_block); | |
2173 | BUG_ON(ret); | |
35b7e476 | 2174 | wait_on_page_locked(pinned[1]); |
a429e513 CM |
2175 | } else { |
2176 | unlock_page(pinned[1]); | |
2177 | } | |
2178 | } | |
2179 | ||
6567e837 CM |
2180 | mutex_lock(&root->fs_info->fs_mutex); |
2181 | trans = btrfs_start_transaction(root, 1); | |
2182 | if (!trans) { | |
2183 | err = -ENOMEM; | |
b18c6685 | 2184 | mutex_unlock(&root->fs_info->fs_mutex); |
6567e837 CM |
2185 | goto out_unlock; |
2186 | } | |
31f3c99b | 2187 | btrfs_set_trans_block_group(trans, inode); |
a429e513 CM |
2188 | /* FIXME blocksize != 4096 */ |
2189 | inode->i_blocks += num_blocks << 3; | |
de428b63 | 2190 | hint_block = 0; |
b18c6685 | 2191 | if (start_pos < inode->i_size) { |
a429e513 | 2192 | /* FIXME blocksize != pagesize */ |
b18c6685 CM |
2193 | ret = drop_extents(trans, root, inode, |
2194 | start_pos, | |
2195 | (pos + count + root->blocksize -1) & | |
de428b63 | 2196 | ~((u64)root->blocksize - 1), &hint_block); |
236454df | 2197 | BUG_ON(ret); |
b18c6685 | 2198 | } |
3a686375 CM |
2199 | if (inode->i_size < start_pos) { |
2200 | u64 last_pos_in_file; | |
2201 | u64 hole_size; | |
2202 | u64 mask = root->blocksize - 1; | |
2203 | last_pos_in_file = (inode->i_size + mask) & ~mask; | |
2204 | hole_size = (start_pos - last_pos_in_file + mask) & ~mask; | |
2205 | hole_size >>= inode->i_blkbits; | |
2206 | if (last_pos_in_file < start_pos) { | |
2207 | ret = btrfs_insert_file_extent(trans, root, | |
2208 | inode->i_ino, | |
2209 | last_pos_in_file, | |
2210 | 0, 0, hole_size); | |
2211 | } | |
2212 | BUG_ON(ret); | |
2213 | } | |
236454df CM |
2214 | if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size || |
2215 | pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) { | |
4d775673 | 2216 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, |
de428b63 CM |
2217 | num_blocks, hint_block, (u64)-1, |
2218 | &ins, 1); | |
236454df CM |
2219 | BUG_ON(ret); |
2220 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
3a686375 CM |
2221 | start_pos, ins.objectid, ins.offset, |
2222 | ins.offset); | |
236454df CM |
2223 | BUG_ON(ret); |
2224 | } else { | |
2225 | ins.offset = 0; | |
2226 | ins.objectid = 0; | |
2227 | } | |
6567e837 | 2228 | BUG_ON(ret); |
b18c6685 | 2229 | alloc_extent_start = ins.objectid; |
e37c9e69 | 2230 | // btrfs_update_inode_block_group(trans, inode); |
b18c6685 | 2231 | ret = btrfs_end_transaction(trans, root); |
6567e837 CM |
2232 | mutex_unlock(&root->fs_info->fs_mutex); |
2233 | ||
75dfe396 CM |
2234 | while(count > 0) { |
2235 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
2236 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
2237 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
2238 | PAGE_CACHE_SHIFT; | |
b18c6685 CM |
2239 | |
2240 | memset(pages, 0, sizeof(pages)); | |
2241 | ret = prepare_pages(root, file, pages, num_pages, | |
6567e837 CM |
2242 | pos, first_index, last_index, |
2243 | write_bytes, alloc_extent_start); | |
75dfe396 | 2244 | BUG_ON(ret); |
b18c6685 | 2245 | |
6567e837 | 2246 | /* FIXME blocks != pagesize */ |
236454df CM |
2247 | if (alloc_extent_start) |
2248 | alloc_extent_start += num_pages; | |
75dfe396 CM |
2249 | ret = btrfs_copy_from_user(pos, num_pages, |
2250 | write_bytes, pages, buf); | |
2251 | BUG_ON(ret); | |
2252 | ||
f254e52c | 2253 | ret = dirty_and_release_pages(NULL, root, file, pages, |
70b2befd | 2254 | num_pages, pos, write_bytes); |
75dfe396 CM |
2255 | BUG_ON(ret); |
2256 | btrfs_drop_pages(pages, num_pages); | |
2257 | ||
75dfe396 CM |
2258 | buf += write_bytes; |
2259 | count -= write_bytes; | |
2260 | pos += write_bytes; | |
2261 | num_written += write_bytes; | |
2262 | ||
2263 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
35b7e476 | 2264 | btrfs_btree_balance_dirty(root); |
75dfe396 CM |
2265 | cond_resched(); |
2266 | } | |
6567e837 | 2267 | out_unlock: |
75dfe396 CM |
2268 | mutex_unlock(&inode->i_mutex); |
2269 | out: | |
a429e513 CM |
2270 | if (pinned[0]) |
2271 | page_cache_release(pinned[0]); | |
2272 | if (pinned[1]) | |
2273 | page_cache_release(pinned[1]); | |
75dfe396 CM |
2274 | *ppos = pos; |
2275 | current->backing_dev_info = NULL; | |
a429e513 | 2276 | mark_inode_dirty(inode); |
75dfe396 CM |
2277 | return num_written ? num_written : err; |
2278 | } | |
2279 | ||
f254e52c CM |
2280 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
2281 | unsigned long offset, unsigned long size) | |
2282 | { | |
2283 | char *kaddr; | |
2284 | unsigned long left, count = desc->count; | |
d6e4a428 | 2285 | struct inode *inode = page->mapping->host; |
f254e52c CM |
2286 | |
2287 | if (size > count) | |
2288 | size = count; | |
2289 | ||
2290 | if (!PageChecked(page)) { | |
2291 | /* FIXME, do it per block */ | |
d6e4a428 | 2292 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1de037a4 CM |
2293 | int ret; |
2294 | struct buffer_head *bh; | |
2295 | ||
2296 | if (page_has_buffers(page)) { | |
2297 | bh = page_buffers(page); | |
2298 | if (!buffer_mapped(bh)) { | |
2299 | SetPageChecked(page); | |
2300 | goto checked; | |
2301 | } | |
2302 | } | |
236454df | 2303 | |
1de037a4 | 2304 | ret = btrfs_csum_verify_file_block(root, |
236454df CM |
2305 | page->mapping->host->i_ino, |
2306 | page->index << PAGE_CACHE_SHIFT, | |
2307 | kmap(page), PAGE_CACHE_SIZE); | |
f254e52c | 2308 | if (ret) { |
3a686375 | 2309 | if (ret != -ENOENT) { |
1de037a4 | 2310 | printk("failed to verify ino %lu page %lu ret %d\n", |
3a686375 | 2311 | page->mapping->host->i_ino, |
1de037a4 CM |
2312 | page->index, ret); |
2313 | memset(page_address(page), 1, PAGE_CACHE_SIZE); | |
3a686375 CM |
2314 | flush_dcache_page(page); |
2315 | } | |
f254e52c CM |
2316 | } |
2317 | SetPageChecked(page); | |
2318 | kunmap(page); | |
2319 | } | |
1de037a4 | 2320 | checked: |
f254e52c CM |
2321 | /* |
2322 | * Faults on the destination of a read are common, so do it before | |
2323 | * taking the kmap. | |
2324 | */ | |
2325 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
2326 | kaddr = kmap_atomic(page, KM_USER0); | |
2327 | left = __copy_to_user_inatomic(desc->arg.buf, | |
2328 | kaddr + offset, size); | |
2329 | kunmap_atomic(kaddr, KM_USER0); | |
2330 | if (left == 0) | |
2331 | goto success; | |
2332 | } | |
2333 | ||
2334 | /* Do it the slow way */ | |
2335 | kaddr = kmap(page); | |
2336 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
2337 | kunmap(page); | |
2338 | ||
2339 | if (left) { | |
2340 | size -= left; | |
2341 | desc->error = -EFAULT; | |
2342 | } | |
2343 | success: | |
2344 | desc->count = count - size; | |
2345 | desc->written += size; | |
2346 | desc->arg.buf += size; | |
2347 | return size; | |
2348 | } | |
2349 | ||
2350 | /** | |
2351 | * btrfs_file_aio_read - filesystem read routine | |
2352 | * @iocb: kernel I/O control block | |
2353 | * @iov: io vector request | |
2354 | * @nr_segs: number of segments in the iovec | |
2355 | * @pos: current file position | |
2356 | */ | |
2357 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
2358 | unsigned long nr_segs, loff_t pos) | |
2359 | { | |
2360 | struct file *filp = iocb->ki_filp; | |
2361 | ssize_t retval; | |
2362 | unsigned long seg; | |
2363 | size_t count; | |
2364 | loff_t *ppos = &iocb->ki_pos; | |
2365 | ||
2366 | count = 0; | |
2367 | for (seg = 0; seg < nr_segs; seg++) { | |
2368 | const struct iovec *iv = &iov[seg]; | |
2369 | ||
2370 | /* | |
2371 | * If any segment has a negative length, or the cumulative | |
2372 | * length ever wraps negative then return -EINVAL. | |
2373 | */ | |
2374 | count += iv->iov_len; | |
2375 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
2376 | return -EINVAL; | |
2377 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
2378 | continue; | |
2379 | if (seg == 0) | |
2380 | return -EFAULT; | |
2381 | nr_segs = seg; | |
2382 | count -= iv->iov_len; /* This segment is no good */ | |
2383 | break; | |
2384 | } | |
2385 | retval = 0; | |
2386 | if (count) { | |
2387 | for (seg = 0; seg < nr_segs; seg++) { | |
2388 | read_descriptor_t desc; | |
2389 | ||
2390 | desc.written = 0; | |
2391 | desc.arg.buf = iov[seg].iov_base; | |
2392 | desc.count = iov[seg].iov_len; | |
2393 | if (desc.count == 0) | |
2394 | continue; | |
2395 | desc.error = 0; | |
2396 | do_generic_file_read(filp, ppos, &desc, | |
2397 | btrfs_read_actor); | |
2398 | retval += desc.written; | |
2399 | if (desc.error) { | |
2400 | retval = retval ?: desc.error; | |
2401 | break; | |
2402 | } | |
2403 | } | |
2404 | } | |
2405 | return retval; | |
2406 | } | |
2407 | ||
2619ba1f CM |
2408 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
2409 | { | |
2410 | struct btrfs_trans_handle *trans; | |
2411 | struct btrfs_key key; | |
2412 | struct btrfs_root_item root_item; | |
2413 | struct btrfs_inode_item *inode_item; | |
2414 | struct buffer_head *subvol; | |
2415 | struct btrfs_leaf *leaf; | |
2416 | struct btrfs_root *new_root; | |
2417 | struct inode *inode; | |
31f3c99b | 2418 | struct inode *dir; |
2619ba1f CM |
2419 | int ret; |
2420 | u64 objectid; | |
2421 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
2422 | ||
2423 | mutex_lock(&root->fs_info->fs_mutex); | |
2424 | trans = btrfs_start_transaction(root, 1); | |
2425 | BUG_ON(!trans); | |
2426 | ||
31f3c99b | 2427 | subvol = btrfs_alloc_free_block(trans, root, 0); |
5e82849e CM |
2428 | if (subvol == NULL) |
2429 | return -ENOSPC; | |
2619ba1f CM |
2430 | leaf = btrfs_buffer_leaf(subvol); |
2431 | btrfs_set_header_nritems(&leaf->header, 0); | |
2432 | btrfs_set_header_level(&leaf->header, 0); | |
7eccb903 | 2433 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
2619ba1f | 2434 | btrfs_set_header_generation(&leaf->header, trans->transid); |
4d775673 | 2435 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); |
2619ba1f CM |
2436 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, |
2437 | sizeof(leaf->header.fsid)); | |
4d775673 | 2438 | mark_buffer_dirty(subvol); |
2619ba1f CM |
2439 | |
2440 | inode_item = &root_item.inode; | |
2441 | memset(inode_item, 0, sizeof(*inode_item)); | |
2442 | btrfs_set_inode_generation(inode_item, 1); | |
2443 | btrfs_set_inode_size(inode_item, 3); | |
2444 | btrfs_set_inode_nlink(inode_item, 1); | |
2445 | btrfs_set_inode_nblocks(inode_item, 1); | |
2446 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
2447 | ||
7eccb903 | 2448 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
2619ba1f | 2449 | btrfs_set_root_refs(&root_item, 1); |
5e82849e CM |
2450 | brelse(subvol); |
2451 | subvol = NULL; | |
2619ba1f | 2452 | |
2619ba1f CM |
2453 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2454 | 0, &objectid); | |
2455 | BUG_ON(ret); | |
2456 | ||
2457 | btrfs_set_root_dirid(&root_item, new_dirid); | |
2458 | ||
2459 | key.objectid = objectid; | |
2460 | key.offset = 1; | |
2461 | key.flags = 0; | |
2462 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
2463 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2464 | &root_item); | |
2465 | BUG_ON(ret); | |
2466 | ||
2467 | /* | |
2468 | * insert the directory item | |
2469 | */ | |
2470 | key.offset = (u64)-1; | |
31f3c99b | 2471 | dir = root->fs_info->sb->s_root->d_inode; |
2619ba1f | 2472 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
fabb5681 CM |
2473 | name, namelen, dir->i_ino, &key, |
2474 | BTRFS_FT_DIR); | |
2619ba1f CM |
2475 | BUG_ON(ret); |
2476 | ||
2477 | ret = btrfs_commit_transaction(trans, root); | |
2478 | BUG_ON(ret); | |
2479 | ||
2480 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
2481 | BUG_ON(!new_root); | |
2482 | ||
2483 | trans = btrfs_start_transaction(new_root, 1); | |
2484 | BUG_ON(!trans); | |
2485 | ||
31f3c99b CM |
2486 | inode = btrfs_new_inode(trans, new_root, new_dirid, |
2487 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
2619ba1f CM |
2488 | inode->i_op = &btrfs_dir_inode_operations; |
2489 | inode->i_fop = &btrfs_dir_file_operations; | |
2490 | ||
2491 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
2492 | BUG_ON(ret); | |
2493 | ||
2494 | inode->i_nlink = 1; | |
2495 | inode->i_size = 6; | |
2496 | ret = btrfs_update_inode(trans, new_root, inode); | |
2497 | BUG_ON(ret); | |
2498 | ||
2499 | ret = btrfs_commit_transaction(trans, new_root); | |
2500 | BUG_ON(ret); | |
2501 | ||
2502 | iput(inode); | |
2503 | ||
2504 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2505 | btrfs_btree_balance_dirty(root); |
2619ba1f CM |
2506 | return 0; |
2507 | } | |
2508 | ||
c5739bba CM |
2509 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
2510 | { | |
2511 | struct btrfs_trans_handle *trans; | |
2512 | struct btrfs_key key; | |
2513 | struct btrfs_root_item new_root_item; | |
2514 | int ret; | |
2515 | u64 objectid; | |
2516 | ||
2619ba1f CM |
2517 | if (!root->ref_cows) |
2518 | return -EINVAL; | |
2519 | ||
c5739bba CM |
2520 | mutex_lock(&root->fs_info->fs_mutex); |
2521 | trans = btrfs_start_transaction(root, 1); | |
2522 | BUG_ON(!trans); | |
2523 | ||
2524 | ret = btrfs_update_inode(trans, root, root->inode); | |
2525 | BUG_ON(ret); | |
2526 | ||
1b05da2e CM |
2527 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2528 | 0, &objectid); | |
c5739bba CM |
2529 | BUG_ON(ret); |
2530 | ||
c5739bba CM |
2531 | memcpy(&new_root_item, &root->root_item, |
2532 | sizeof(new_root_item)); | |
2533 | ||
c5739bba CM |
2534 | key.objectid = objectid; |
2535 | key.offset = 1; | |
2536 | key.flags = 0; | |
2537 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
7eccb903 | 2538 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
c5739bba CM |
2539 | |
2540 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2541 | &new_root_item); | |
2542 | BUG_ON(ret); | |
2543 | ||
c5739bba CM |
2544 | /* |
2545 | * insert the directory item | |
2546 | */ | |
2547 | key.offset = (u64)-1; | |
2548 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2549 | name, namelen, | |
2550 | root->fs_info->sb->s_root->d_inode->i_ino, | |
fabb5681 | 2551 | &key, BTRFS_FT_DIR); |
c5739bba CM |
2552 | |
2553 | BUG_ON(ret); | |
2554 | ||
2555 | ret = btrfs_inc_root_ref(trans, root); | |
2556 | BUG_ON(ret); | |
2557 | ||
2558 | ret = btrfs_commit_transaction(trans, root); | |
2559 | BUG_ON(ret); | |
2560 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2561 | btrfs_btree_balance_dirty(root); |
c5739bba CM |
2562 | return 0; |
2563 | } | |
2564 | ||
2565 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int | |
2566 | cmd, unsigned long arg) | |
2567 | { | |
2568 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2569 | struct btrfs_ioctl_vol_args vol_args; | |
8352d8a4 | 2570 | int ret = 0; |
7e38180e | 2571 | struct btrfs_dir_item *di; |
c5739bba | 2572 | int namelen; |
2619ba1f CM |
2573 | struct btrfs_path *path; |
2574 | u64 root_dirid; | |
c5739bba | 2575 | |
c5739bba CM |
2576 | switch (cmd) { |
2577 | case BTRFS_IOC_SNAP_CREATE: | |
2578 | if (copy_from_user(&vol_args, | |
2579 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2580 | sizeof(vol_args))) | |
2581 | return -EFAULT; | |
2582 | namelen = strlen(vol_args.name); | |
2583 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2584 | return -EINVAL; | |
2619ba1f CM |
2585 | path = btrfs_alloc_path(); |
2586 | if (!path) | |
2587 | return -ENOMEM; | |
2d13d8d0 | 2588 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
2619ba1f | 2589 | mutex_lock(&root->fs_info->fs_mutex); |
7e38180e | 2590 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
2619ba1f CM |
2591 | path, root_dirid, |
2592 | vol_args.name, namelen, 0); | |
2593 | mutex_unlock(&root->fs_info->fs_mutex); | |
2d13d8d0 | 2594 | btrfs_free_path(path); |
7e38180e | 2595 | if (di && !IS_ERR(di)) |
2619ba1f CM |
2596 | return -EEXIST; |
2597 | ||
2598 | if (root == root->fs_info->tree_root) | |
2599 | ret = create_subvol(root, vol_args.name, namelen); | |
2600 | else | |
2601 | ret = create_snapshot(root, vol_args.name, namelen); | |
c5739bba CM |
2602 | WARN_ON(ret); |
2603 | break; | |
2604 | default: | |
2605 | return -ENOTTY; | |
2606 | } | |
8352d8a4 | 2607 | return ret; |
c5739bba CM |
2608 | } |
2609 | ||
08607c1b CM |
2610 | #ifdef CONFIG_COMPAT |
2611 | static long btrfs_compat_ioctl(struct file *file, unsigned int cmd, | |
2612 | unsigned long arg) | |
2613 | { | |
2614 | struct inode *inode = file->f_path.dentry->d_inode; | |
2615 | int ret; | |
2616 | lock_kernel(); | |
2617 | ret = btrfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); | |
2618 | unlock_kernel(); | |
2619 | return ret; | |
2620 | ||
2621 | } | |
2622 | #endif | |
2623 | ||
2c90e5d6 CM |
2624 | static struct kmem_cache *btrfs_inode_cachep; |
2625 | struct kmem_cache *btrfs_trans_handle_cachep; | |
2626 | struct kmem_cache *btrfs_transaction_cachep; | |
2627 | struct kmem_cache *btrfs_bit_radix_cachep; | |
2628 | struct kmem_cache *btrfs_path_cachep; | |
2629 | ||
2630 | /* | |
2631 | * Called inside transaction, so use GFP_NOFS | |
2632 | */ | |
2633 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2634 | { | |
2635 | struct btrfs_inode *ei; | |
2636 | ||
2637 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2638 | if (!ei) | |
2639 | return NULL; | |
2c90e5d6 CM |
2640 | return &ei->vfs_inode; |
2641 | } | |
2642 | ||
2643 | static void btrfs_destroy_inode(struct inode *inode) | |
2644 | { | |
2c90e5d6 | 2645 | WARN_ON(!list_empty(&inode->i_dentry)); |
2c90e5d6 CM |
2646 | WARN_ON(inode->i_data.nrpages); |
2647 | ||
2c90e5d6 CM |
2648 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2649 | } | |
2650 | ||
2651 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2652 | unsigned long flags) | |
2653 | { | |
2654 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2655 | ||
f9f3c6b6 | 2656 | if ((flags & (SLAB_CTOR_CONSTRUCTOR)) == |
2c90e5d6 CM |
2657 | SLAB_CTOR_CONSTRUCTOR) { |
2658 | inode_init_once(&ei->vfs_inode); | |
2659 | } | |
2660 | } | |
2661 | ||
2662 | static int init_inodecache(void) | |
2663 | { | |
2664 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
2665 | sizeof(struct btrfs_inode), | |
2666 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2667 | SLAB_MEM_SPREAD), | |
2668 | init_once, NULL); | |
2669 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
2670 | sizeof(struct btrfs_trans_handle), | |
2671 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2672 | SLAB_MEM_SPREAD), | |
2673 | NULL, NULL); | |
2674 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
2675 | sizeof(struct btrfs_transaction), | |
2676 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2677 | SLAB_MEM_SPREAD), | |
2678 | NULL, NULL); | |
2679 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
2680 | sizeof(struct btrfs_transaction), | |
2681 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2682 | SLAB_MEM_SPREAD), | |
2683 | NULL, NULL); | |
2684 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
2685 | 256, | |
2686 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2687 | SLAB_MEM_SPREAD | | |
2688 | SLAB_DESTROY_BY_RCU), | |
2689 | NULL, NULL); | |
2690 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
2691 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
2692 | return -ENOMEM; | |
2693 | return 0; | |
2694 | } | |
2695 | ||
2696 | static void destroy_inodecache(void) | |
2697 | { | |
2698 | kmem_cache_destroy(btrfs_inode_cachep); | |
2699 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2700 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2701 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2702 | kmem_cache_destroy(btrfs_path_cachep); | |
2703 | } | |
2704 | ||
2e635a27 CM |
2705 | static int btrfs_get_sb(struct file_system_type *fs_type, |
2706 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
2707 | { | |
2708 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
2709 | btrfs_fill_super, mnt); | |
2710 | } | |
2711 | ||
236454df CM |
2712 | static int btrfs_getattr(struct vfsmount *mnt, |
2713 | struct dentry *dentry, struct kstat *stat) | |
2714 | { | |
2715 | struct inode *inode = dentry->d_inode; | |
2716 | generic_fillattr(inode, stat); | |
2717 | stat->blksize = 256 * 1024; | |
2718 | return 0; | |
2719 | } | |
2720 | ||
8fd17795 CM |
2721 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2722 | { | |
2723 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
2724 | struct btrfs_super_block *disk_super = root->fs_info->disk_super; | |
2725 | ||
2726 | buf->f_namelen = BTRFS_NAME_LEN; | |
2727 | buf->f_blocks = btrfs_super_total_blocks(disk_super); | |
2728 | buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super); | |
2729 | buf->f_bavail = buf->f_bfree; | |
2730 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2731 | buf->f_type = BTRFS_SUPER_MAGIC; | |
2732 | return 0; | |
2733 | } | |
b5133862 | 2734 | |
e06afa83 CM |
2735 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, |
2736 | struct inode * new_dir,struct dentry *new_dentry) | |
2737 | { | |
2738 | struct btrfs_trans_handle *trans; | |
2739 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2740 | struct inode *new_inode = new_dentry->d_inode; | |
2741 | struct inode *old_inode = old_dentry->d_inode; | |
2742 | struct timespec ctime = CURRENT_TIME; | |
2743 | struct btrfs_path *path; | |
2744 | struct btrfs_dir_item *di; | |
2745 | int ret; | |
2746 | ||
2747 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2748 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2749 | return -ENOTEMPTY; | |
2750 | } | |
2751 | mutex_lock(&root->fs_info->fs_mutex); | |
2752 | trans = btrfs_start_transaction(root, 1); | |
2753 | btrfs_set_trans_block_group(trans, new_dir); | |
2754 | path = btrfs_alloc_path(); | |
2755 | if (!path) { | |
2756 | ret = -ENOMEM; | |
2757 | goto out_fail; | |
2758 | } | |
2759 | ||
2760 | old_dentry->d_inode->i_nlink++; | |
2761 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2762 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2763 | old_inode->i_ctime = ctime; | |
2764 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { | |
2765 | struct btrfs_key *location = &BTRFS_I(new_dir)->location; | |
2766 | u64 old_parent_oid; | |
2767 | di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino, | |
2768 | "..", 2, -1); | |
2769 | if (IS_ERR(di)) { | |
2770 | ret = PTR_ERR(di); | |
2771 | goto out_fail; | |
2772 | } | |
2773 | if (!di) { | |
2774 | ret = -ENOENT; | |
2775 | goto out_fail; | |
2776 | } | |
2777 | old_parent_oid = btrfs_disk_key_objectid(&di->location); | |
2778 | ret = btrfs_del_item(trans, root, path); | |
2779 | if (ret) { | |
2780 | ret = -EIO; | |
2781 | goto out_fail; | |
2782 | } | |
2783 | btrfs_release_path(root, path); | |
2784 | ||
2785 | di = btrfs_lookup_dir_index_item(trans, root, path, | |
2786 | old_inode->i_ino, | |
2787 | old_parent_oid, | |
2788 | "..", 2, -1); | |
2789 | if (IS_ERR(di)) { | |
2790 | ret = PTR_ERR(di); | |
2791 | goto out_fail; | |
2792 | } | |
2793 | if (!di) { | |
2794 | ret = -ENOENT; | |
2795 | goto out_fail; | |
2796 | } | |
2797 | ret = btrfs_del_item(trans, root, path); | |
2798 | if (ret) { | |
2799 | ret = -EIO; | |
2800 | goto out_fail; | |
2801 | } | |
2802 | btrfs_release_path(root, path); | |
2803 | ||
2804 | ret = btrfs_insert_dir_item(trans, root, "..", 2, | |
fabb5681 CM |
2805 | old_inode->i_ino, location, |
2806 | BTRFS_FT_DIR); | |
e06afa83 CM |
2807 | if (ret) |
2808 | goto out_fail; | |
2809 | } | |
2810 | ||
2811 | ||
e06afa83 CM |
2812 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2813 | if (ret) | |
2814 | goto out_fail; | |
2815 | ||
2816 | if (new_inode) { | |
2817 | new_inode->i_ctime = CURRENT_TIME; | |
2b8d99a7 CM |
2818 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); |
2819 | if (ret) | |
2820 | goto out_fail; | |
e06afa83 CM |
2821 | if (S_ISDIR(new_inode->i_mode)) |
2822 | clear_nlink(new_inode); | |
2823 | else | |
2824 | drop_nlink(new_inode); | |
2825 | btrfs_update_inode(trans, root, new_inode); | |
2826 | } | |
2b8d99a7 CM |
2827 | ret = btrfs_add_link(trans, new_dentry, old_inode); |
2828 | if (ret) | |
2829 | goto out_fail; | |
2830 | ||
e06afa83 CM |
2831 | out_fail: |
2832 | btrfs_free_path(path); | |
2833 | btrfs_end_transaction(trans, root); | |
2834 | mutex_unlock(&root->fs_info->fs_mutex); | |
2835 | return ret; | |
2836 | } | |
2837 | ||
2b8d99a7 CM |
2838 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
2839 | const char *symname) | |
2840 | { | |
2841 | struct btrfs_trans_handle *trans; | |
2842 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2843 | struct btrfs_path *path; | |
2844 | struct btrfs_key key; | |
2845 | struct inode *inode; | |
2846 | int err; | |
2847 | int drop_inode = 0; | |
2848 | u64 objectid; | |
2849 | int name_len; | |
2850 | int datasize; | |
2851 | char *ptr; | |
2852 | struct btrfs_file_extent_item *ei; | |
2853 | ||
2854 | name_len = strlen(symname) + 1; | |
2855 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2856 | return -ENAMETOOLONG; | |
2857 | mutex_lock(&root->fs_info->fs_mutex); | |
2858 | trans = btrfs_start_transaction(root, 1); | |
2859 | btrfs_set_trans_block_group(trans, dir); | |
2860 | ||
2861 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2862 | if (err) { | |
2863 | err = -ENOSPC; | |
2864 | goto out_unlock; | |
2865 | } | |
2866 | ||
2867 | inode = btrfs_new_inode(trans, root, objectid, | |
2868 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2869 | err = PTR_ERR(inode); | |
2870 | if (IS_ERR(inode)) | |
2871 | goto out_unlock; | |
2872 | ||
2873 | btrfs_set_trans_block_group(trans, inode); | |
2874 | err = btrfs_add_nondir(trans, dentry, inode); | |
2875 | if (err) | |
2876 | drop_inode = 1; | |
2877 | else { | |
2878 | inode->i_mapping->a_ops = &btrfs_aops; | |
2879 | inode->i_fop = &btrfs_file_operations; | |
2880 | inode->i_op = &btrfs_file_inode_operations; | |
2881 | } | |
2882 | dir->i_sb->s_dirt = 1; | |
2883 | btrfs_update_inode_block_group(trans, inode); | |
2884 | btrfs_update_inode_block_group(trans, dir); | |
2885 | if (drop_inode) | |
2886 | goto out_unlock; | |
2887 | ||
2888 | path = btrfs_alloc_path(); | |
2889 | BUG_ON(!path); | |
2890 | key.objectid = inode->i_ino; | |
2891 | key.offset = 0; | |
2892 | key.flags = 0; | |
2893 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
2894 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2895 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2896 | datasize); | |
2897 | BUG_ON(err); | |
2898 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2899 | path->slots[0], struct btrfs_file_extent_item); | |
2900 | btrfs_set_file_extent_generation(ei, trans->transid); | |
2901 | btrfs_set_file_extent_type(ei, | |
2902 | BTRFS_FILE_EXTENT_INLINE); | |
2903 | ptr = btrfs_file_extent_inline_start(ei); | |
2904 | btrfs_memcpy(root, path->nodes[0]->b_data, | |
2905 | ptr, symname, name_len); | |
2906 | mark_buffer_dirty(path->nodes[0]); | |
2907 | btrfs_free_path(path); | |
2908 | inode->i_op = &btrfs_symlink_inode_operations; | |
2909 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2910 | inode->i_size = name_len - 1; | |
2911 | btrfs_update_inode(trans, root, inode); | |
2912 | err = 0; | |
2913 | ||
2914 | out_unlock: | |
2915 | btrfs_end_transaction(trans, root); | |
2916 | mutex_unlock(&root->fs_info->fs_mutex); | |
2917 | ||
2918 | if (drop_inode) { | |
2919 | inode_dec_link_count(inode); | |
2920 | iput(inode); | |
2921 | } | |
2922 | btrfs_btree_balance_dirty(root); | |
2923 | return err; | |
2924 | } | |
2925 | ||
2e635a27 CM |
2926 | static struct file_system_type btrfs_fs_type = { |
2927 | .owner = THIS_MODULE, | |
2928 | .name = "btrfs", | |
2929 | .get_sb = btrfs_get_sb, | |
2930 | .kill_sb = kill_block_super, | |
2931 | .fs_flags = FS_REQUIRES_DEV, | |
2932 | }; | |
2933 | ||
e20d96d6 | 2934 | static struct super_operations btrfs_super_ops = { |
134e9731 | 2935 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
2936 | .put_super = btrfs_put_super, |
2937 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
2938 | .write_super = btrfs_write_super, |
2939 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 2940 | .write_inode = btrfs_write_inode, |
b5133862 | 2941 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
2942 | .alloc_inode = btrfs_alloc_inode, |
2943 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2944 | .statfs = btrfs_statfs, |
e20d96d6 CM |
2945 | }; |
2946 | ||
2947 | static struct inode_operations btrfs_dir_inode_operations = { | |
2948 | .lookup = btrfs_lookup, | |
d5719762 | 2949 | .create = btrfs_create, |
134e9731 | 2950 | .unlink = btrfs_unlink, |
2b8d99a7 | 2951 | .link = btrfs_link, |
f7922033 | 2952 | .mkdir = btrfs_mkdir, |
5f443fd2 | 2953 | .rmdir = btrfs_rmdir, |
e06afa83 | 2954 | .rename = btrfs_rename, |
2b8d99a7 | 2955 | .symlink = btrfs_symlink, |
3a686375 | 2956 | .setattr = btrfs_setattr, |
e20d96d6 CM |
2957 | }; |
2958 | ||
d6e4a428 CM |
2959 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2960 | .lookup = btrfs_lookup, | |
2961 | }; | |
2962 | ||
e20d96d6 CM |
2963 | static struct file_operations btrfs_dir_file_operations = { |
2964 | .llseek = generic_file_llseek, | |
2965 | .read = generic_read_dir, | |
2966 | .readdir = btrfs_readdir, | |
c5739bba | 2967 | .ioctl = btrfs_ioctl, |
08607c1b CM |
2968 | #ifdef CONFIG_COMPAT |
2969 | .compat_ioctl = btrfs_compat_ioctl, | |
2970 | #endif | |
e20d96d6 CM |
2971 | }; |
2972 | ||
dee26a9f CM |
2973 | static struct address_space_operations btrfs_aops = { |
2974 | .readpage = btrfs_readpage, | |
dee26a9f CM |
2975 | .writepage = btrfs_writepage, |
2976 | .sync_page = block_sync_page, | |
2977 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 2978 | .commit_write = btrfs_commit_write, |
fabb5681 | 2979 | .bmap = btrfs_bmap, |
dee26a9f CM |
2980 | }; |
2981 | ||
2b8d99a7 CM |
2982 | static struct address_space_operations btrfs_symlink_aops = { |
2983 | .readpage = btrfs_readpage, | |
2984 | .writepage = btrfs_writepage, | |
2985 | }; | |
2986 | ||
dee26a9f | 2987 | static struct inode_operations btrfs_file_inode_operations = { |
f4b9aa8d | 2988 | .truncate = btrfs_truncate, |
236454df | 2989 | .getattr = btrfs_getattr, |
3a686375 | 2990 | .setattr = btrfs_setattr, |
dee26a9f CM |
2991 | }; |
2992 | ||
2993 | static struct file_operations btrfs_file_operations = { | |
2994 | .llseek = generic_file_llseek, | |
2995 | .read = do_sync_read, | |
e8f05c45 CM |
2996 | .aio_read = btrfs_file_aio_read, |
2997 | .write = btrfs_file_write, | |
dee26a9f CM |
2998 | .mmap = generic_file_mmap, |
2999 | .open = generic_file_open, | |
c5739bba | 3000 | .ioctl = btrfs_ioctl, |
8fd17795 | 3001 | .fsync = btrfs_sync_file, |
08607c1b CM |
3002 | #ifdef CONFIG_COMPAT |
3003 | .compat_ioctl = btrfs_compat_ioctl, | |
3004 | #endif | |
dee26a9f | 3005 | }; |
e20d96d6 | 3006 | |
2b8d99a7 CM |
3007 | static struct inode_operations btrfs_symlink_inode_operations = { |
3008 | .readlink = generic_readlink, | |
3009 | .follow_link = page_follow_link_light, | |
3010 | .put_link = page_put_link, | |
3011 | }; | |
3012 | ||
2e635a27 CM |
3013 | static int __init init_btrfs_fs(void) |
3014 | { | |
2c90e5d6 | 3015 | int err; |
2e635a27 | 3016 | printk("btrfs loaded!\n"); |
08607c1b | 3017 | btrfs_init_transaction_sys(); |
2c90e5d6 CM |
3018 | err = init_inodecache(); |
3019 | if (err) | |
3020 | return err; | |
2e635a27 | 3021 | return register_filesystem(&btrfs_fs_type); |
d6e4a428 CM |
3022 | destroy_inodecache(); |
3023 | return err; | |
2e635a27 CM |
3024 | } |
3025 | ||
3026 | static void __exit exit_btrfs_fs(void) | |
3027 | { | |
08607c1b | 3028 | btrfs_exit_transaction_sys(); |
2c90e5d6 | 3029 | destroy_inodecache(); |
2e635a27 CM |
3030 | unregister_filesystem(&btrfs_fs_type); |
3031 | printk("btrfs unloaded\n"); | |
3032 | } | |
3033 | ||
3034 | module_init(init_btrfs_fs) | |
3035 | module_exit(exit_btrfs_fs) | |
3036 | ||
3037 | MODULE_LICENSE("GPL"); |