Commit | Line | Data |
---|---|---|
2e635a27 | 1 | #include <linux/module.h> |
e20d96d6 | 2 | #include <linux/buffer_head.h> |
2e635a27 CM |
3 | #include <linux/fs.h> |
4 | #include <linux/pagemap.h> | |
5 | #include <linux/highmem.h> | |
6 | #include <linux/time.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/string.h> | |
9 | #include <linux/smp_lock.h> | |
10 | #include <linux/backing-dev.h> | |
dee26a9f | 11 | #include <linux/mpage.h> |
75dfe396 CM |
12 | #include <linux/swap.h> |
13 | #include <linux/writeback.h> | |
8fd17795 | 14 | #include <linux/statfs.h> |
2e635a27 | 15 | #include "ctree.h" |
e20d96d6 | 16 | #include "disk-io.h" |
d5719762 | 17 | #include "transaction.h" |
2c90e5d6 | 18 | #include "btrfs_inode.h" |
c5739bba | 19 | #include "ioctl.h" |
3a686375 | 20 | #include "print-tree.h" |
2e635a27 | 21 | |
c5739bba CM |
22 | struct btrfs_iget_args { |
23 | u64 ino; | |
24 | struct btrfs_root *root; | |
25 | }; | |
26 | ||
2e635a27 | 27 | #define BTRFS_SUPER_MAGIC 0x9123682E |
e20d96d6 CM |
28 | |
29 | static struct inode_operations btrfs_dir_inode_operations; | |
2b8d99a7 | 30 | static struct inode_operations btrfs_symlink_inode_operations; |
d6e4a428 | 31 | static struct inode_operations btrfs_dir_ro_inode_operations; |
e20d96d6 CM |
32 | static struct super_operations btrfs_super_ops; |
33 | static struct file_operations btrfs_dir_file_operations; | |
dee26a9f CM |
34 | static struct inode_operations btrfs_file_inode_operations; |
35 | static struct address_space_operations btrfs_aops; | |
2b8d99a7 | 36 | static struct address_space_operations btrfs_symlink_aops; |
dee26a9f | 37 | static struct file_operations btrfs_file_operations; |
e20d96d6 | 38 | |
1de037a4 CM |
39 | static int drop_extents(struct btrfs_trans_handle *trans, |
40 | struct btrfs_root *root, | |
41 | struct inode *inode, | |
42 | u64 start, u64 end, u64 *hint_block); | |
43 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
44 | struct buffer_head *result, int create); | |
45 | ||
fabb5681 CM |
46 | |
47 | #define S_SHIFT 12 | |
48 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
49 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
50 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
51 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
52 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
53 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
54 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
55 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
56 | }; | |
57 | ||
e20d96d6 | 58 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 59 | { |
5caf2a00 | 60 | struct btrfs_path *path; |
e20d96d6 | 61 | struct btrfs_inode_item *inode_item; |
d6e4a428 CM |
62 | struct btrfs_root *root = BTRFS_I(inode)->root; |
63 | struct btrfs_key location; | |
31f3c99b CM |
64 | struct btrfs_block_group_cache *alloc_group; |
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 CM |
96 | alloc_group_block = btrfs_inode_block_group(inode_item); |
97 | ret = radix_tree_gang_lookup(&root->fs_info->block_group_radix, | |
98 | (void **)&alloc_group, | |
99 | alloc_group_block, 1); | |
100 | BUG_ON(!ret); | |
101 | BTRFS_I(inode)->block_group = alloc_group; | |
5caf2a00 | 102 | |
5caf2a00 CM |
103 | btrfs_free_path(path); |
104 | inode_item = NULL; | |
105 | ||
f4b9aa8d | 106 | mutex_unlock(&root->fs_info->fs_mutex); |
1b05da2e | 107 | |
e20d96d6 CM |
108 | switch (inode->i_mode & S_IFMT) { |
109 | #if 0 | |
110 | default: | |
111 | init_special_inode(inode, inode->i_mode, | |
112 | btrfs_inode_rdev(inode_item)); | |
113 | break; | |
114 | #endif | |
115 | case S_IFREG: | |
dee26a9f CM |
116 | inode->i_mapping->a_ops = &btrfs_aops; |
117 | inode->i_fop = &btrfs_file_operations; | |
118 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
119 | break; |
120 | case S_IFDIR: | |
e20d96d6 | 121 | inode->i_fop = &btrfs_dir_file_operations; |
d6e4a428 CM |
122 | if (root == root->fs_info->tree_root) |
123 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
124 | else | |
125 | inode->i_op = &btrfs_dir_inode_operations; | |
e20d96d6 CM |
126 | break; |
127 | case S_IFLNK: | |
2b8d99a7 CM |
128 | inode->i_op = &btrfs_symlink_inode_operations; |
129 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
e20d96d6 | 130 | break; |
2e635a27 | 131 | } |
e20d96d6 | 132 | return; |
d6e4a428 CM |
133 | |
134 | make_bad: | |
135 | btrfs_release_path(root, path); | |
136 | btrfs_free_path(path); | |
137 | mutex_unlock(&root->fs_info->fs_mutex); | |
138 | make_bad_inode(inode); | |
2e635a27 CM |
139 | } |
140 | ||
f68cad0f CM |
141 | static void fill_inode_item(struct btrfs_inode_item *item, |
142 | struct inode *inode) | |
143 | { | |
144 | btrfs_set_inode_uid(item, inode->i_uid); | |
145 | btrfs_set_inode_gid(item, inode->i_gid); | |
146 | btrfs_set_inode_size(item, inode->i_size); | |
147 | btrfs_set_inode_mode(item, inode->i_mode); | |
148 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
149 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
150 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
151 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
152 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
153 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
154 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
155 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
156 | btrfs_set_inode_generation(item, inode->i_generation); | |
31f3c99b CM |
157 | btrfs_set_inode_block_group(item, |
158 | BTRFS_I(inode)->block_group->key.objectid); | |
f68cad0f CM |
159 | } |
160 | ||
f68cad0f CM |
161 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
162 | struct btrfs_root *root, | |
163 | struct inode *inode) | |
164 | { | |
165 | struct btrfs_inode_item *inode_item; | |
166 | struct btrfs_path *path; | |
167 | int ret; | |
168 | ||
169 | path = btrfs_alloc_path(); | |
170 | BUG_ON(!path); | |
171 | btrfs_init_path(path); | |
172 | ret = btrfs_lookup_inode(trans, root, path, | |
173 | &BTRFS_I(inode)->location, 1); | |
174 | if (ret) { | |
175 | if (ret > 0) | |
176 | ret = -ENOENT; | |
177 | goto failed; | |
178 | } | |
179 | ||
180 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
181 | path->slots[0], | |
182 | struct btrfs_inode_item); | |
183 | ||
184 | fill_inode_item(inode_item, inode); | |
185 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
186 | ret = 0; | |
187 | failed: | |
188 | btrfs_release_path(root, path); | |
189 | btrfs_free_path(path); | |
190 | return ret; | |
191 | } | |
192 | ||
193 | ||
5f443fd2 CM |
194 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
195 | struct btrfs_root *root, | |
196 | struct inode *dir, | |
197 | struct dentry *dentry) | |
134e9731 | 198 | { |
5caf2a00 | 199 | struct btrfs_path *path; |
134e9731 CM |
200 | const char *name = dentry->d_name.name; |
201 | int name_len = dentry->d_name.len; | |
7e38180e | 202 | int ret = 0; |
134e9731 CM |
203 | u64 objectid; |
204 | struct btrfs_dir_item *di; | |
205 | ||
5caf2a00 CM |
206 | path = btrfs_alloc_path(); |
207 | BUG_ON(!path); | |
208 | btrfs_init_path(path); | |
7e38180e | 209 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
134e9731 | 210 | name, name_len, -1); |
7e38180e CM |
211 | if (IS_ERR(di)) { |
212 | ret = PTR_ERR(di); | |
134e9731 | 213 | goto err; |
7e38180e CM |
214 | } |
215 | if (!di) { | |
134e9731 CM |
216 | ret = -ENOENT; |
217 | goto err; | |
218 | } | |
d6e4a428 | 219 | objectid = btrfs_disk_key_objectid(&di->location); |
7e38180e CM |
220 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
221 | BUG_ON(ret); | |
222 | btrfs_release_path(root, path); | |
134e9731 | 223 | |
7e38180e CM |
224 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
225 | objectid, name, name_len, -1); | |
226 | if (IS_ERR(di)) { | |
227 | ret = PTR_ERR(di); | |
228 | goto err; | |
229 | } | |
230 | if (!di) { | |
231 | ret = -ENOENT; | |
232 | goto err; | |
233 | } | |
234 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
5f26f772 CM |
235 | BUG_ON(ret); |
236 | ||
134e9731 CM |
237 | dentry->d_inode->i_ctime = dir->i_ctime; |
238 | err: | |
5caf2a00 | 239 | btrfs_free_path(path); |
f68cad0f | 240 | if (!ret) { |
5f26f772 | 241 | dir->i_size -= name_len * 2; |
f68cad0f CM |
242 | btrfs_update_inode(trans, root, dir); |
243 | drop_nlink(dentry->d_inode); | |
244 | btrfs_update_inode(trans, root, dentry->d_inode); | |
cd1bc465 | 245 | dir->i_sb->s_dirt = 1; |
d4dbff95 | 246 | } |
134e9731 CM |
247 | return ret; |
248 | } | |
249 | ||
5f443fd2 CM |
250 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
251 | { | |
252 | struct btrfs_root *root; | |
253 | struct btrfs_trans_handle *trans; | |
254 | int ret; | |
255 | ||
d6e4a428 | 256 | root = BTRFS_I(dir)->root; |
5f443fd2 CM |
257 | mutex_lock(&root->fs_info->fs_mutex); |
258 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 259 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
260 | ret = btrfs_unlink_trans(trans, root, dir, dentry); |
261 | btrfs_end_transaction(trans, root); | |
262 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 263 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
264 | return ret; |
265 | } | |
266 | ||
267 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
268 | { | |
269 | struct inode *inode = dentry->d_inode; | |
270 | int err; | |
271 | int ret; | |
d6e4a428 | 272 | struct btrfs_root *root = BTRFS_I(dir)->root; |
5caf2a00 | 273 | struct btrfs_path *path; |
5f443fd2 CM |
274 | struct btrfs_key key; |
275 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
276 | struct btrfs_key found_key; |
277 | int found_type; | |
5f443fd2 | 278 | struct btrfs_leaf *leaf; |
5f26f772 | 279 | char *goodnames = ".."; |
5f443fd2 | 280 | |
5caf2a00 CM |
281 | path = btrfs_alloc_path(); |
282 | BUG_ON(!path); | |
283 | btrfs_init_path(path); | |
5f443fd2 CM |
284 | mutex_lock(&root->fs_info->fs_mutex); |
285 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 286 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
287 | key.objectid = inode->i_ino; |
288 | key.offset = (u64)-1; | |
5f26f772 CM |
289 | key.flags = (u32)-1; |
290 | while(1) { | |
291 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
292 | if (ret < 0) { | |
293 | err = ret; | |
294 | goto out; | |
295 | } | |
296 | BUG_ON(ret == 0); | |
297 | if (path->slots[0] == 0) { | |
298 | err = -ENOENT; | |
299 | goto out; | |
300 | } | |
301 | path->slots[0]--; | |
302 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
303 | btrfs_disk_key_to_cpu(&found_key, | |
304 | &leaf->items[path->slots[0]].key); | |
305 | found_type = btrfs_key_type(&found_key); | |
306 | if (found_key.objectid != inode->i_ino) { | |
307 | err = -ENOENT; | |
308 | goto out; | |
309 | } | |
310 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
311 | found_type != BTRFS_DIR_INDEX_KEY) || | |
312 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
313 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
314 | err = -ENOTEMPTY; | |
315 | goto out; | |
316 | } | |
317 | ret = btrfs_del_item(trans, root, path); | |
318 | BUG_ON(ret); | |
5f443fd2 | 319 | |
5f26f772 CM |
320 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
321 | break; | |
322 | btrfs_release_path(root, path); | |
5f443fd2 | 323 | } |
5f26f772 | 324 | ret = 0; |
5caf2a00 | 325 | btrfs_release_path(root, path); |
5f443fd2 CM |
326 | |
327 | /* now the directory is empty */ | |
328 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
329 | if (!err) { | |
330 | inode->i_size = 0; | |
331 | } | |
332 | out: | |
7cfcc17e CM |
333 | btrfs_release_path(root, path); |
334 | btrfs_free_path(path); | |
5f443fd2 CM |
335 | mutex_unlock(&root->fs_info->fs_mutex); |
336 | ret = btrfs_end_transaction(trans, root); | |
35b7e476 | 337 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
338 | if (ret && !err) |
339 | err = ret; | |
340 | return err; | |
341 | } | |
342 | ||
134e9731 CM |
343 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
344 | struct btrfs_root *root, | |
345 | struct inode *inode) | |
346 | { | |
5caf2a00 | 347 | struct btrfs_path *path; |
134e9731 | 348 | int ret; |
5caf2a00 | 349 | |
134e9731 | 350 | clear_inode(inode); |
5caf2a00 CM |
351 | |
352 | path = btrfs_alloc_path(); | |
353 | BUG_ON(!path); | |
354 | btrfs_init_path(path); | |
d6e4a428 CM |
355 | ret = btrfs_lookup_inode(trans, root, path, |
356 | &BTRFS_I(inode)->location, -1); | |
134e9731 | 357 | BUG_ON(ret); |
5caf2a00 | 358 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 359 | BUG_ON(ret); |
5caf2a00 | 360 | btrfs_free_path(path); |
134e9731 CM |
361 | return ret; |
362 | } | |
363 | ||
de428b63 CM |
364 | static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path, |
365 | u64 objectid) | |
366 | { | |
367 | struct btrfs_node *node; | |
368 | int i; | |
369 | int nritems; | |
370 | u64 item_objectid; | |
371 | u64 blocknr; | |
372 | int slot; | |
373 | int ret; | |
374 | ||
375 | if (!path->nodes[1]) | |
376 | return; | |
377 | node = btrfs_buffer_node(path->nodes[1]); | |
378 | slot = path->slots[1]; | |
379 | if (slot == 0) | |
380 | return; | |
381 | nritems = btrfs_header_nritems(&node->header); | |
382 | for (i = slot - 1; i >= 0; i--) { | |
383 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); | |
384 | if (item_objectid != objectid) | |
385 | break; | |
386 | blocknr = btrfs_node_blockptr(node, i); | |
387 | ret = readahead_tree_block(root, blocknr); | |
388 | if (ret) | |
389 | break; | |
390 | } | |
391 | } | |
392 | ||
f4b9aa8d CM |
393 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
394 | struct btrfs_root *root, | |
395 | struct inode *inode) | |
396 | { | |
397 | int ret; | |
5caf2a00 | 398 | struct btrfs_path *path; |
f4b9aa8d CM |
399 | struct btrfs_key key; |
400 | struct btrfs_disk_key *found_key; | |
e06afa83 | 401 | u32 found_type; |
f4b9aa8d | 402 | struct btrfs_leaf *leaf; |
1de037a4 | 403 | struct btrfs_file_extent_item *fi; |
f254e52c CM |
404 | u64 extent_start = 0; |
405 | u64 extent_num_blocks = 0; | |
1de037a4 | 406 | u64 item_end = 0; |
f254e52c | 407 | int found_extent; |
1de037a4 | 408 | int del_item; |
f4b9aa8d | 409 | |
5caf2a00 CM |
410 | path = btrfs_alloc_path(); |
411 | BUG_ON(!path); | |
f4b9aa8d CM |
412 | /* FIXME, add redo link to tree so we don't leak on crash */ |
413 | key.objectid = inode->i_ino; | |
414 | key.offset = (u64)-1; | |
e06afa83 | 415 | key.flags = (u32)-1; |
f4b9aa8d | 416 | while(1) { |
5caf2a00 | 417 | btrfs_init_path(path); |
1de037a4 | 418 | fi = NULL; |
5caf2a00 | 419 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
f4b9aa8d | 420 | if (ret < 0) { |
f4b9aa8d CM |
421 | goto error; |
422 | } | |
423 | if (ret > 0) { | |
5caf2a00 CM |
424 | BUG_ON(path->slots[0] == 0); |
425 | path->slots[0]--; | |
f4b9aa8d | 426 | } |
de428b63 | 427 | reada_truncate(root, path, inode->i_ino); |
5caf2a00 CM |
428 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
429 | found_key = &leaf->items[path->slots[0]].key; | |
e06afa83 | 430 | found_type = btrfs_disk_key_type(found_key); |
f4b9aa8d CM |
431 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
432 | break; | |
e06afa83 CM |
433 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
434 | found_type != BTRFS_DIR_ITEM_KEY && | |
435 | found_type != BTRFS_DIR_INDEX_KEY && | |
436 | found_type != BTRFS_EXTENT_DATA_KEY) | |
f4b9aa8d | 437 | break; |
1de037a4 CM |
438 | item_end = btrfs_disk_key_offset(found_key); |
439 | if (found_type == BTRFS_EXTENT_DATA_KEY) { | |
5caf2a00 CM |
440 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
441 | path->slots[0], | |
f254e52c | 442 | struct btrfs_file_extent_item); |
236454df CM |
443 | if (btrfs_file_extent_type(fi) != |
444 | BTRFS_FILE_EXTENT_INLINE) { | |
1de037a4 CM |
445 | item_end += btrfs_file_extent_num_blocks(fi) << |
446 | inode->i_blkbits; | |
447 | } | |
448 | } | |
449 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
450 | ret = btrfs_csum_truncate(trans, root, path, | |
451 | inode->i_size); | |
452 | BUG_ON(ret); | |
453 | } | |
454 | if (item_end < inode->i_size) { | |
455 | if (found_type) { | |
456 | btrfs_set_key_type(&key, found_type - 1); | |
457 | continue; | |
458 | } | |
459 | break; | |
460 | } | |
461 | if (btrfs_disk_key_offset(found_key) >= inode->i_size) | |
462 | del_item = 1; | |
463 | else | |
464 | del_item = 0; | |
465 | found_extent = 0; | |
466 | ||
467 | if (found_type == BTRFS_EXTENT_DATA_KEY && | |
468 | btrfs_file_extent_type(fi) != | |
469 | BTRFS_FILE_EXTENT_INLINE) { | |
470 | u64 num_dec; | |
471 | if (!del_item) { | |
472 | u64 orig_num_blocks = | |
473 | btrfs_file_extent_num_blocks(fi); | |
474 | extent_num_blocks = inode->i_size - | |
475 | btrfs_disk_key_offset(found_key) + | |
476 | root->blocksize - 1; | |
477 | extent_num_blocks >>= inode->i_blkbits; | |
478 | btrfs_set_file_extent_num_blocks(fi, | |
479 | extent_num_blocks); | |
480 | inode->i_blocks -= (orig_num_blocks - | |
481 | extent_num_blocks) << 3; | |
482 | mark_buffer_dirty(path->nodes[0]); | |
483 | } else { | |
236454df CM |
484 | extent_start = |
485 | btrfs_file_extent_disk_blocknr(fi); | |
486 | extent_num_blocks = | |
487 | btrfs_file_extent_disk_num_blocks(fi); | |
488 | /* FIXME blocksize != 4096 */ | |
3a686375 CM |
489 | num_dec = btrfs_file_extent_num_blocks(fi) << 3; |
490 | if (extent_start != 0) { | |
491 | found_extent = 1; | |
492 | inode->i_blocks -= num_dec; | |
493 | } | |
236454df | 494 | } |
f254e52c | 495 | } |
1de037a4 CM |
496 | if (del_item) { |
497 | ret = btrfs_del_item(trans, root, path); | |
498 | BUG_ON(ret); | |
499 | } else { | |
500 | break; | |
501 | } | |
5caf2a00 | 502 | btrfs_release_path(root, path); |
f254e52c CM |
503 | if (found_extent) { |
504 | ret = btrfs_free_extent(trans, root, extent_start, | |
505 | extent_num_blocks, 0); | |
506 | BUG_ON(ret); | |
507 | } | |
f4b9aa8d | 508 | } |
f4b9aa8d CM |
509 | ret = 0; |
510 | error: | |
5caf2a00 CM |
511 | btrfs_release_path(root, path); |
512 | btrfs_free_path(path); | |
cd1bc465 | 513 | inode->i_sb->s_dirt = 1; |
f4b9aa8d CM |
514 | return ret; |
515 | } | |
516 | ||
1de037a4 CM |
517 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) |
518 | { | |
519 | struct inode *inode = mapping->host; | |
520 | unsigned blocksize = 1 << inode->i_blkbits; | |
521 | pgoff_t index = from >> PAGE_CACHE_SHIFT; | |
522 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
523 | struct page *page; | |
524 | char *kaddr; | |
525 | int ret = 0; | |
526 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
527 | u64 alloc_hint; | |
528 | struct btrfs_key ins; | |
529 | struct btrfs_trans_handle *trans; | |
530 | ||
531 | if ((offset & (blocksize - 1)) == 0) | |
532 | goto out; | |
533 | ||
534 | ret = -ENOMEM; | |
535 | page = grab_cache_page(mapping, index); | |
536 | if (!page) | |
537 | goto out; | |
538 | ||
539 | if (!PageUptodate(page)) { | |
540 | ret = mpage_readpage(page, btrfs_get_block); | |
541 | lock_page(page); | |
542 | if (!PageUptodate(page)) { | |
543 | ret = -EIO; | |
544 | goto out; | |
545 | } | |
546 | } | |
547 | mutex_lock(&root->fs_info->fs_mutex); | |
548 | trans = btrfs_start_transaction(root, 1); | |
549 | btrfs_set_trans_block_group(trans, inode); | |
550 | ||
551 | ret = drop_extents(trans, root, inode, page->index << PAGE_CACHE_SHIFT, | |
552 | (page->index + 1) << PAGE_CACHE_SHIFT, &alloc_hint); | |
553 | BUG_ON(ret); | |
554 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, 1, | |
555 | alloc_hint, (u64)-1, &ins, 1); | |
556 | BUG_ON(ret); | |
557 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
558 | page->index << PAGE_CACHE_SHIFT, | |
559 | ins.objectid, 1, 1); | |
560 | BUG_ON(ret); | |
561 | SetPageChecked(page); | |
562 | kaddr = kmap(page); | |
563 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
564 | flush_dcache_page(page); | |
565 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
566 | page->index << PAGE_CACHE_SHIFT, | |
567 | kaddr, PAGE_CACHE_SIZE); | |
568 | kunmap(page); | |
569 | btrfs_end_transaction(trans, root); | |
570 | mutex_unlock(&root->fs_info->fs_mutex); | |
571 | ||
572 | set_page_dirty(page); | |
573 | unlock_page(page); | |
574 | page_cache_release(page); | |
575 | out: | |
576 | return ret; | |
577 | } | |
578 | ||
3a686375 CM |
579 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
580 | { | |
581 | struct inode *inode = dentry->d_inode; | |
582 | int err; | |
583 | ||
584 | err = inode_change_ok(inode, attr); | |
585 | if (err) | |
586 | return err; | |
587 | ||
588 | if (S_ISREG(inode->i_mode) && | |
589 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
590 | struct btrfs_trans_handle *trans; | |
591 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
592 | u64 mask = root->blocksize - 1; | |
593 | u64 pos = (inode->i_size + mask) & ~mask; | |
594 | u64 hole_size; | |
595 | ||
1de037a4 | 596 | if (attr->ia_size <= pos) |
3a686375 | 597 | goto out; |
1de037a4 CM |
598 | |
599 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
600 | ||
3a686375 CM |
601 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
602 | hole_size >>= inode->i_blkbits; | |
603 | ||
604 | mutex_lock(&root->fs_info->fs_mutex); | |
605 | trans = btrfs_start_transaction(root, 1); | |
606 | btrfs_set_trans_block_group(trans, inode); | |
607 | err = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
608 | pos, 0, 0, hole_size); | |
609 | BUG_ON(err); | |
610 | btrfs_end_transaction(trans, root); | |
611 | mutex_unlock(&root->fs_info->fs_mutex); | |
612 | } | |
1de037a4 | 613 | out: |
3a686375 CM |
614 | err = inode_setattr(inode, attr); |
615 | ||
3a686375 CM |
616 | return err; |
617 | } | |
134e9731 CM |
618 | static void btrfs_delete_inode(struct inode *inode) |
619 | { | |
620 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 621 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
622 | int ret; |
623 | ||
134e9731 CM |
624 | truncate_inode_pages(&inode->i_data, 0); |
625 | if (is_bad_inode(inode)) { | |
626 | goto no_delete; | |
627 | } | |
628 | inode->i_size = 0; | |
134e9731 CM |
629 | mutex_lock(&root->fs_info->fs_mutex); |
630 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 631 | btrfs_set_trans_block_group(trans, inode); |
e06afa83 CM |
632 | ret = btrfs_truncate_in_trans(trans, root, inode); |
633 | BUG_ON(ret); | |
134e9731 CM |
634 | btrfs_free_inode(trans, root, inode); |
635 | btrfs_end_transaction(trans, root); | |
636 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 637 | btrfs_btree_balance_dirty(root); |
134e9731 CM |
638 | return; |
639 | no_delete: | |
640 | clear_inode(inode); | |
641 | } | |
642 | ||
e20d96d6 | 643 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
d6e4a428 | 644 | struct btrfs_key *location) |
e20d96d6 CM |
645 | { |
646 | const char *name = dentry->d_name.name; | |
647 | int namelen = dentry->d_name.len; | |
648 | struct btrfs_dir_item *di; | |
5caf2a00 | 649 | struct btrfs_path *path; |
d6e4a428 | 650 | struct btrfs_root *root = BTRFS_I(dir)->root; |
e20d96d6 CM |
651 | int ret; |
652 | ||
5caf2a00 CM |
653 | path = btrfs_alloc_path(); |
654 | BUG_ON(!path); | |
655 | btrfs_init_path(path); | |
7e38180e | 656 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
e20d96d6 | 657 | namelen, 0); |
7e38180e | 658 | if (!di || IS_ERR(di)) { |
d6e4a428 | 659 | location->objectid = 0; |
2c90e5d6 | 660 | ret = 0; |
e20d96d6 CM |
661 | goto out; |
662 | } | |
d6e4a428 | 663 | btrfs_disk_key_to_cpu(location, &di->location); |
e20d96d6 | 664 | out: |
5caf2a00 CM |
665 | btrfs_release_path(root, path); |
666 | btrfs_free_path(path); | |
e20d96d6 CM |
667 | return ret; |
668 | } | |
669 | ||
35b7e476 | 670 | static int fixup_tree_root_location(struct btrfs_root *root, |
d6e4a428 CM |
671 | struct btrfs_key *location, |
672 | struct btrfs_root **sub_root) | |
673 | { | |
674 | struct btrfs_path *path; | |
675 | struct btrfs_root_item *ri; | |
d6e4a428 CM |
676 | |
677 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
678 | return 0; | |
679 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
680 | return 0; | |
681 | ||
682 | path = btrfs_alloc_path(); | |
683 | BUG_ON(!path); | |
684 | mutex_lock(&root->fs_info->fs_mutex); | |
685 | ||
0f7d52f4 CM |
686 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
687 | if (IS_ERR(*sub_root)) | |
688 | return PTR_ERR(*sub_root); | |
689 | ||
690 | ri = &(*sub_root)->root_item; | |
d6e4a428 CM |
691 | location->objectid = btrfs_root_dirid(ri); |
692 | location->flags = 0; | |
693 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
694 | location->offset = 0; | |
0f7d52f4 | 695 | |
d6e4a428 CM |
696 | btrfs_free_path(path); |
697 | mutex_unlock(&root->fs_info->fs_mutex); | |
0f7d52f4 | 698 | return 0; |
d6e4a428 CM |
699 | } |
700 | ||
35b7e476 | 701 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
c5739bba CM |
702 | { |
703 | struct btrfs_iget_args *args = p; | |
704 | inode->i_ino = args->ino; | |
705 | BTRFS_I(inode)->root = args->root; | |
706 | return 0; | |
707 | } | |
708 | ||
35b7e476 | 709 | static int btrfs_find_actor(struct inode *inode, void *opaque) |
c5739bba CM |
710 | { |
711 | struct btrfs_iget_args *args = opaque; | |
712 | return (args->ino == inode->i_ino && | |
713 | args->root == BTRFS_I(inode)->root); | |
714 | } | |
715 | ||
35b7e476 CM |
716 | static struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
717 | struct btrfs_root *root) | |
c5739bba CM |
718 | { |
719 | struct inode *inode; | |
720 | struct btrfs_iget_args args; | |
721 | args.ino = objectid; | |
722 | args.root = root; | |
723 | ||
724 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
725 | btrfs_init_locked_inode, | |
726 | (void *)&args); | |
727 | return inode; | |
728 | } | |
d6e4a428 | 729 | |
e20d96d6 CM |
730 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
731 | struct nameidata *nd) | |
732 | { | |
733 | struct inode * inode; | |
d6e4a428 CM |
734 | struct btrfs_inode *bi = BTRFS_I(dir); |
735 | struct btrfs_root *root = bi->root; | |
736 | struct btrfs_root *sub_root = root; | |
737 | struct btrfs_key location; | |
e20d96d6 CM |
738 | int ret; |
739 | ||
740 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
741 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 742 | mutex_lock(&root->fs_info->fs_mutex); |
d6e4a428 | 743 | ret = btrfs_inode_by_name(dir, dentry, &location); |
22b0ebda | 744 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
745 | if (ret < 0) |
746 | return ERR_PTR(ret); | |
747 | inode = NULL; | |
d6e4a428 CM |
748 | if (location.objectid) { |
749 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
750 | if (ret < 0) | |
751 | return ERR_PTR(ret); | |
752 | if (ret > 0) | |
753 | return ERR_PTR(-ENOENT); | |
c5739bba CM |
754 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
755 | sub_root); | |
e20d96d6 CM |
756 | if (!inode) |
757 | return ERR_PTR(-EACCES); | |
d6e4a428 | 758 | if (inode->i_state & I_NEW) { |
0f7d52f4 | 759 | if (sub_root != root) { |
c5739bba | 760 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
0f7d52f4 CM |
761 | igrab(inode); |
762 | sub_root->inode = inode; | |
763 | } | |
d6e4a428 CM |
764 | BTRFS_I(inode)->root = sub_root; |
765 | memcpy(&BTRFS_I(inode)->location, &location, | |
766 | sizeof(location)); | |
767 | btrfs_read_locked_inode(inode); | |
768 | unlock_new_inode(inode); | |
769 | } | |
e20d96d6 CM |
770 | } |
771 | return d_splice_alias(inode, dentry); | |
772 | } | |
773 | ||
de428b63 CM |
774 | static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path, |
775 | u64 objectid) | |
090d1875 CM |
776 | { |
777 | struct btrfs_node *node; | |
778 | int i; | |
de428b63 | 779 | u32 nritems; |
090d1875 CM |
780 | u64 item_objectid; |
781 | u64 blocknr; | |
782 | int slot; | |
de428b63 | 783 | int ret; |
090d1875 CM |
784 | |
785 | if (!path->nodes[1]) | |
786 | return; | |
787 | node = btrfs_buffer_node(path->nodes[1]); | |
788 | slot = path->slots[1]; | |
090d1875 | 789 | nritems = btrfs_header_nritems(&node->header); |
de428b63 | 790 | for (i = slot + 1; i < nritems; i++) { |
090d1875 CM |
791 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); |
792 | if (item_objectid != objectid) | |
793 | break; | |
794 | blocknr = btrfs_node_blockptr(node, i); | |
de428b63 CM |
795 | ret = readahead_tree_block(root, blocknr); |
796 | if (ret) | |
797 | break; | |
090d1875 CM |
798 | } |
799 | } | |
fabb5681 CM |
800 | static unsigned char btrfs_filetype_table[] = { |
801 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
802 | }; | |
090d1875 | 803 | |
e20d96d6 CM |
804 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
805 | { | |
806 | struct inode *inode = filp->f_path.dentry->d_inode; | |
d6e4a428 | 807 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e20d96d6 CM |
808 | struct btrfs_item *item; |
809 | struct btrfs_dir_item *di; | |
810 | struct btrfs_key key; | |
5caf2a00 | 811 | struct btrfs_path *path; |
e20d96d6 CM |
812 | int ret; |
813 | u32 nritems; | |
814 | struct btrfs_leaf *leaf; | |
815 | int slot; | |
816 | int advance; | |
fabb5681 | 817 | unsigned char d_type; |
7f5c1516 | 818 | int over = 0; |
7e38180e CM |
819 | u32 di_cur; |
820 | u32 di_total; | |
821 | u32 di_len; | |
822 | int key_type = BTRFS_DIR_INDEX_KEY; | |
d6e4a428 CM |
823 | |
824 | /* FIXME, use a real flag for deciding about the key type */ | |
825 | if (root->fs_info->tree_root == root) | |
826 | key_type = BTRFS_DIR_ITEM_KEY; | |
22b0ebda | 827 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 828 | key.objectid = inode->i_ino; |
e20d96d6 | 829 | key.flags = 0; |
d6e4a428 | 830 | btrfs_set_key_type(&key, key_type); |
e20d96d6 | 831 | key.offset = filp->f_pos; |
5caf2a00 CM |
832 | path = btrfs_alloc_path(); |
833 | btrfs_init_path(path); | |
834 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1b05da2e | 835 | if (ret < 0) |
e20d96d6 | 836 | goto err; |
7f5c1516 | 837 | advance = 0; |
de428b63 | 838 | reada_leaves(root, path, inode->i_ino); |
e20d96d6 | 839 | while(1) { |
5caf2a00 | 840 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 841 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 842 | slot = path->slots[0]; |
dee26a9f CM |
843 | if (advance || slot >= nritems) { |
844 | if (slot >= nritems -1) { | |
de428b63 | 845 | reada_leaves(root, path, inode->i_ino); |
5caf2a00 | 846 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
847 | if (ret) |
848 | break; | |
5caf2a00 | 849 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 850 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 851 | slot = path->slots[0]; |
e20d96d6 CM |
852 | } else { |
853 | slot++; | |
5caf2a00 | 854 | path->slots[0]++; |
e20d96d6 CM |
855 | } |
856 | } | |
857 | advance = 1; | |
858 | item = leaf->items + slot; | |
e20d96d6 CM |
859 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
860 | break; | |
d6e4a428 | 861 | if (btrfs_disk_key_type(&item->key) != key_type) |
a429e513 | 862 | break; |
7f5c1516 CM |
863 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
864 | continue; | |
7fcde0e3 | 865 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
dee26a9f | 866 | advance = 1; |
e20d96d6 | 867 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
7e38180e CM |
868 | di_cur = 0; |
869 | di_total = btrfs_item_size(leaf->items + slot); | |
870 | while(di_cur < di_total) { | |
fabb5681 | 871 | d_type = btrfs_filetype_table[btrfs_dir_type(di)]; |
7e38180e CM |
872 | over = filldir(dirent, (const char *)(di + 1), |
873 | btrfs_dir_name_len(di), | |
874 | btrfs_disk_key_offset(&item->key), | |
875 | btrfs_disk_key_objectid(&di->location), | |
876 | d_type); | |
877 | if (over) | |
878 | goto nopos; | |
879 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
880 | di_cur += di_len; | |
881 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
882 | } | |
e20d96d6 | 883 | } |
7fcde0e3 CM |
884 | filp->f_pos++; |
885 | nopos: | |
e20d96d6 CM |
886 | ret = 0; |
887 | err: | |
5caf2a00 CM |
888 | btrfs_release_path(root, path); |
889 | btrfs_free_path(path); | |
22b0ebda | 890 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
891 | return ret; |
892 | } | |
893 | ||
894 | static void btrfs_put_super (struct super_block * sb) | |
895 | { | |
896 | struct btrfs_root *root = btrfs_sb(sb); | |
897 | int ret; | |
898 | ||
899 | ret = close_ctree(root); | |
900 | if (ret) { | |
901 | printk("close ctree returns %d\n", ret); | |
902 | } | |
903 | sb->s_fs_info = NULL; | |
904 | } | |
2e635a27 CM |
905 | |
906 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
907 | { | |
908 | struct inode * inode; | |
e20d96d6 CM |
909 | struct dentry * root_dentry; |
910 | struct btrfs_super_block *disk_super; | |
0f7d52f4 | 911 | struct btrfs_root *tree_root; |
d6e4a428 | 912 | struct btrfs_inode *bi; |
2e635a27 CM |
913 | |
914 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 915 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 916 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 917 | sb->s_time_gran = 1; |
e20d96d6 | 918 | |
0f7d52f4 | 919 | tree_root = open_ctree(sb); |
d98237b3 | 920 | |
0f7d52f4 | 921 | if (!tree_root) { |
e20d96d6 CM |
922 | printk("btrfs: open_ctree failed\n"); |
923 | return -EIO; | |
924 | } | |
0f7d52f4 CM |
925 | sb->s_fs_info = tree_root; |
926 | disk_super = tree_root->fs_info->disk_super; | |
e20d96d6 CM |
927 | printk("read in super total blocks %Lu root %Lu\n", |
928 | btrfs_super_total_blocks(disk_super), | |
929 | btrfs_super_root_dir(disk_super)); | |
930 | ||
c5739bba CM |
931 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
932 | tree_root); | |
d6e4a428 CM |
933 | bi = BTRFS_I(inode); |
934 | bi->location.objectid = inode->i_ino; | |
935 | bi->location.offset = 0; | |
936 | bi->location.flags = 0; | |
0f7d52f4 | 937 | bi->root = tree_root; |
d6e4a428 CM |
938 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
939 | ||
2e635a27 CM |
940 | if (!inode) |
941 | return -ENOMEM; | |
e20d96d6 CM |
942 | if (inode->i_state & I_NEW) { |
943 | btrfs_read_locked_inode(inode); | |
944 | unlock_new_inode(inode); | |
945 | } | |
2e635a27 | 946 | |
e20d96d6 CM |
947 | root_dentry = d_alloc_root(inode); |
948 | if (!root_dentry) { | |
2e635a27 CM |
949 | iput(inode); |
950 | return -ENOMEM; | |
951 | } | |
e20d96d6 CM |
952 | sb->s_root = root_dentry; |
953 | ||
2e635a27 CM |
954 | return 0; |
955 | } | |
956 | ||
4730a4bc CM |
957 | static int btrfs_write_inode(struct inode *inode, int wait) |
958 | { | |
d6e4a428 | 959 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4730a4bc | 960 | struct btrfs_trans_handle *trans; |
b5133862 CM |
961 | int ret = 0; |
962 | ||
963 | if (wait) { | |
964 | mutex_lock(&root->fs_info->fs_mutex); | |
965 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 966 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
967 | ret = btrfs_commit_transaction(trans, root); |
968 | mutex_unlock(&root->fs_info->fs_mutex); | |
969 | } | |
970 | return ret; | |
971 | } | |
972 | ||
973 | static void btrfs_dirty_inode(struct inode *inode) | |
974 | { | |
975 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
976 | struct btrfs_trans_handle *trans; | |
4730a4bc CM |
977 | |
978 | mutex_lock(&root->fs_info->fs_mutex); | |
979 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 980 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
981 | btrfs_update_inode(trans, root, inode); |
982 | btrfs_end_transaction(trans, root); | |
4730a4bc | 983 | mutex_unlock(&root->fs_info->fs_mutex); |
35b7e476 | 984 | btrfs_btree_balance_dirty(root); |
4730a4bc CM |
985 | } |
986 | ||
d5719762 | 987 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2619ba1f | 988 | struct btrfs_root *root, |
31f3c99b CM |
989 | u64 objectid, |
990 | struct btrfs_block_group_cache *group, | |
991 | int mode) | |
d5719762 CM |
992 | { |
993 | struct inode *inode; | |
994 | struct btrfs_inode_item inode_item; | |
1b05da2e | 995 | struct btrfs_key *location; |
d5719762 | 996 | int ret; |
de428b63 | 997 | int owner; |
d5719762 | 998 | |
2619ba1f | 999 | inode = new_inode(root->fs_info->sb); |
d5719762 CM |
1000 | if (!inode) |
1001 | return ERR_PTR(-ENOMEM); | |
1002 | ||
2619ba1f | 1003 | BTRFS_I(inode)->root = root; |
de428b63 CM |
1004 | if (mode & S_IFDIR) |
1005 | owner = 0; | |
1006 | else | |
1007 | owner = 1; | |
1008 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
31f3c99b | 1009 | BTRFS_I(inode)->block_group = group; |
d5719762 CM |
1010 | |
1011 | inode->i_uid = current->fsuid; | |
1012 | inode->i_gid = current->fsgid; | |
1013 | inode->i_mode = mode; | |
1014 | inode->i_ino = objectid; | |
1015 | inode->i_blocks = 0; | |
c5739bba | 1016 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
d5719762 | 1017 | fill_inode_item(&inode_item, inode); |
1b05da2e CM |
1018 | location = &BTRFS_I(inode)->location; |
1019 | location->objectid = objectid; | |
1020 | location->flags = 0; | |
1021 | location->offset = 0; | |
1022 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
d5719762 CM |
1023 | |
1024 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
1025 | BUG_ON(ret); | |
1026 | ||
1027 | insert_inode_hash(inode); | |
d5719762 CM |
1028 | return inode; |
1029 | } | |
1030 | ||
fabb5681 CM |
1031 | static inline u8 btrfs_inode_type(struct inode *inode) |
1032 | { | |
1033 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1034 | } | |
1035 | ||
d5719762 CM |
1036 | static int btrfs_add_link(struct btrfs_trans_handle *trans, |
1037 | struct dentry *dentry, struct inode *inode) | |
1038 | { | |
1039 | int ret; | |
d6e4a428 CM |
1040 | struct btrfs_key key; |
1041 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
1042 | key.objectid = inode->i_ino; | |
1043 | key.flags = 0; | |
1044 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1045 | key.offset = 0; | |
1046 | ||
1047 | ret = btrfs_insert_dir_item(trans, root, | |
d5719762 CM |
1048 | dentry->d_name.name, dentry->d_name.len, |
1049 | dentry->d_parent->d_inode->i_ino, | |
fabb5681 | 1050 | &key, btrfs_inode_type(inode)); |
4730a4bc | 1051 | if (ret == 0) { |
5f26f772 | 1052 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
d6e4a428 | 1053 | ret = btrfs_update_inode(trans, root, |
4730a4bc CM |
1054 | dentry->d_parent->d_inode); |
1055 | } | |
d5719762 CM |
1056 | return ret; |
1057 | } | |
1058 | ||
1059 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1060 | struct dentry *dentry, struct inode *inode) | |
1061 | { | |
1062 | int err = btrfs_add_link(trans, dentry, inode); | |
1063 | if (!err) { | |
1064 | d_instantiate(dentry, inode); | |
1065 | return 0; | |
1066 | } | |
2c90e5d6 CM |
1067 | if (err > 0) |
1068 | err = -EEXIST; | |
d5719762 CM |
1069 | return err; |
1070 | } | |
1071 | ||
1072 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
1073 | int mode, struct nameidata *nd) | |
1074 | { | |
1075 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 1076 | struct btrfs_root *root = BTRFS_I(dir)->root; |
d5719762 CM |
1077 | struct inode *inode; |
1078 | int err; | |
134e9731 | 1079 | int drop_inode = 0; |
2619ba1f | 1080 | u64 objectid; |
d5719762 | 1081 | |
d561c025 | 1082 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 | 1083 | trans = btrfs_start_transaction(root, 1); |
31f3c99b | 1084 | btrfs_set_trans_block_group(trans, dir); |
2619ba1f CM |
1085 | |
1086 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1087 | if (err) { | |
1088 | err = -ENOSPC; | |
1089 | goto out_unlock; | |
1090 | } | |
1091 | ||
31f3c99b CM |
1092 | inode = btrfs_new_inode(trans, root, objectid, |
1093 | BTRFS_I(dir)->block_group, mode); | |
d5719762 CM |
1094 | err = PTR_ERR(inode); |
1095 | if (IS_ERR(inode)) | |
d561c025 | 1096 | goto out_unlock; |
31f3c99b CM |
1097 | |
1098 | btrfs_set_trans_block_group(trans, inode); | |
d5719762 | 1099 | err = btrfs_add_nondir(trans, dentry, inode); |
134e9731 CM |
1100 | if (err) |
1101 | drop_inode = 1; | |
dee26a9f CM |
1102 | else { |
1103 | inode->i_mapping->a_ops = &btrfs_aops; | |
1104 | inode->i_fop = &btrfs_file_operations; | |
1105 | inode->i_op = &btrfs_file_inode_operations; | |
1106 | } | |
d5719762 | 1107 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
1108 | btrfs_update_inode_block_group(trans, inode); |
1109 | btrfs_update_inode_block_group(trans, dir); | |
d561c025 | 1110 | out_unlock: |
22b0ebda | 1111 | btrfs_end_transaction(trans, root); |
d561c025 | 1112 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 1113 | |
134e9731 CM |
1114 | if (drop_inode) { |
1115 | inode_dec_link_count(inode); | |
1116 | iput(inode); | |
1117 | } | |
35b7e476 | 1118 | btrfs_btree_balance_dirty(root); |
d5719762 CM |
1119 | return err; |
1120 | } | |
1121 | ||
2b8d99a7 CM |
1122 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, |
1123 | struct dentry *dentry) | |
1124 | { | |
1125 | struct btrfs_trans_handle *trans; | |
1126 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1127 | struct inode *inode = old_dentry->d_inode; | |
1128 | int err; | |
1129 | int drop_inode = 0; | |
1130 | ||
1131 | if (inode->i_nlink == 0) | |
1132 | return -ENOENT; | |
1133 | ||
1134 | inc_nlink(inode); | |
1135 | mutex_lock(&root->fs_info->fs_mutex); | |
1136 | trans = btrfs_start_transaction(root, 1); | |
1137 | btrfs_set_trans_block_group(trans, dir); | |
1138 | atomic_inc(&inode->i_count); | |
1139 | err = btrfs_add_nondir(trans, dentry, inode); | |
1140 | if (err) | |
1141 | drop_inode = 1; | |
1142 | dir->i_sb->s_dirt = 1; | |
1143 | btrfs_update_inode_block_group(trans, dir); | |
1144 | btrfs_update_inode(trans, root, inode); | |
1145 | ||
1146 | btrfs_end_transaction(trans, root); | |
1147 | mutex_unlock(&root->fs_info->fs_mutex); | |
1148 | ||
1149 | if (drop_inode) { | |
1150 | inode_dec_link_count(inode); | |
1151 | iput(inode); | |
1152 | } | |
1153 | btrfs_btree_balance_dirty(root); | |
1154 | return err; | |
1155 | } | |
1156 | ||
f7922033 | 1157 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
2619ba1f CM |
1158 | struct btrfs_root *root, |
1159 | u64 objectid, u64 dirid) | |
f7922033 | 1160 | { |
f7922033 CM |
1161 | int ret; |
1162 | char buf[2]; | |
d6e4a428 CM |
1163 | struct btrfs_key key; |
1164 | ||
f7922033 CM |
1165 | buf[0] = '.'; |
1166 | buf[1] = '.'; | |
1167 | ||
2619ba1f | 1168 | key.objectid = objectid; |
d6e4a428 CM |
1169 | key.offset = 0; |
1170 | key.flags = 0; | |
1171 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1172 | ||
2619ba1f | 1173 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
fabb5681 | 1174 | &key, BTRFS_FT_DIR); |
f7922033 CM |
1175 | if (ret) |
1176 | goto error; | |
2619ba1f CM |
1177 | key.objectid = dirid; |
1178 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
fabb5681 | 1179 | &key, BTRFS_FT_DIR); |
4730a4bc CM |
1180 | if (ret) |
1181 | goto error; | |
f7922033 CM |
1182 | error: |
1183 | return ret; | |
1184 | } | |
1185 | ||
1186 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1187 | { | |
1188 | struct inode *inode; | |
1189 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 1190 | struct btrfs_root *root = BTRFS_I(dir)->root; |
f7922033 CM |
1191 | int err = 0; |
1192 | int drop_on_err = 0; | |
2619ba1f | 1193 | u64 objectid; |
f7922033 CM |
1194 | |
1195 | mutex_lock(&root->fs_info->fs_mutex); | |
1196 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1197 | btrfs_set_trans_block_group(trans, dir); |
f7922033 CM |
1198 | if (IS_ERR(trans)) { |
1199 | err = PTR_ERR(trans); | |
1200 | goto out_unlock; | |
1201 | } | |
2619ba1f CM |
1202 | |
1203 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1204 | if (err) { | |
1205 | err = -ENOSPC; | |
1206 | goto out_unlock; | |
1207 | } | |
1208 | ||
31f3c99b CM |
1209 | inode = btrfs_new_inode(trans, root, objectid, |
1210 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
f7922033 CM |
1211 | if (IS_ERR(inode)) { |
1212 | err = PTR_ERR(inode); | |
1213 | goto out_fail; | |
1214 | } | |
1215 | drop_on_err = 1; | |
1216 | inode->i_op = &btrfs_dir_inode_operations; | |
1217 | inode->i_fop = &btrfs_dir_file_operations; | |
31f3c99b | 1218 | btrfs_set_trans_block_group(trans, inode); |
f7922033 | 1219 | |
2619ba1f CM |
1220 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
1221 | if (err) | |
1222 | goto out_fail; | |
1223 | ||
1224 | inode->i_size = 6; | |
1225 | err = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
1226 | if (err) |
1227 | goto out_fail; | |
1228 | err = btrfs_add_link(trans, dentry, inode); | |
1229 | if (err) | |
1230 | goto out_fail; | |
1231 | d_instantiate(dentry, inode); | |
f7922033 | 1232 | drop_on_err = 0; |
cd1bc465 | 1233 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
1234 | btrfs_update_inode_block_group(trans, inode); |
1235 | btrfs_update_inode_block_group(trans, dir); | |
f7922033 CM |
1236 | |
1237 | out_fail: | |
1238 | btrfs_end_transaction(trans, root); | |
1239 | out_unlock: | |
1240 | mutex_unlock(&root->fs_info->fs_mutex); | |
1241 | if (drop_on_err) | |
1242 | iput(inode); | |
35b7e476 | 1243 | btrfs_btree_balance_dirty(root); |
f7922033 CM |
1244 | return err; |
1245 | } | |
1246 | ||
8fd17795 CM |
1247 | static int btrfs_sync_file(struct file *file, |
1248 | struct dentry *dentry, int datasync) | |
1249 | { | |
1250 | struct inode *inode = dentry->d_inode; | |
1251 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1252 | int ret; | |
1253 | struct btrfs_trans_handle *trans; | |
1254 | ||
1255 | mutex_lock(&root->fs_info->fs_mutex); | |
1256 | trans = btrfs_start_transaction(root, 1); | |
1257 | if (!trans) { | |
1258 | ret = -ENOMEM; | |
1259 | goto out; | |
1260 | } | |
1261 | ret = btrfs_commit_transaction(trans, root); | |
1262 | mutex_unlock(&root->fs_info->fs_mutex); | |
1263 | out: | |
1264 | return ret > 0 ? EIO : ret; | |
1265 | } | |
1266 | ||
d5719762 CM |
1267 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
1268 | { | |
1269 | struct btrfs_trans_handle *trans; | |
1270 | struct btrfs_root *root; | |
1271 | int ret; | |
d98237b3 | 1272 | root = btrfs_sb(sb); |
df2ce34c | 1273 | |
d5719762 | 1274 | sb->s_dirt = 0; |
d561c025 | 1275 | if (!wait) { |
7cfcc17e | 1276 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
1277 | return 0; |
1278 | } | |
d561c025 | 1279 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
1280 | trans = btrfs_start_transaction(root, 1); |
1281 | ret = btrfs_commit_transaction(trans, root); | |
1282 | sb->s_dirt = 0; | |
1283 | BUG_ON(ret); | |
1284 | printk("btrfs sync_fs\n"); | |
d561c025 | 1285 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
1286 | return 0; |
1287 | } | |
1288 | ||
fabb5681 CM |
1289 | #define BTRFS_GET_BLOCK_NO_CREATE 0 |
1290 | #define BTRFS_GET_BLOCK_CREATE 1 | |
1291 | #define BTRFS_GET_BLOCK_NO_DIRECT 2 | |
1292 | ||
75dfe396 | 1293 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
1294 | struct buffer_head *result, int create) |
1295 | { | |
1296 | int ret; | |
1297 | int err = 0; | |
1298 | u64 blocknr; | |
1299 | u64 extent_start = 0; | |
1300 | u64 extent_end = 0; | |
1301 | u64 objectid = inode->i_ino; | |
236454df | 1302 | u32 found_type; |
1de037a4 | 1303 | u64 alloc_hint = 0; |
5caf2a00 | 1304 | struct btrfs_path *path; |
d6e4a428 | 1305 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dee26a9f CM |
1306 | struct btrfs_file_extent_item *item; |
1307 | struct btrfs_leaf *leaf; | |
1308 | struct btrfs_disk_key *found_key; | |
1de037a4 | 1309 | struct btrfs_trans_handle *trans = NULL; |
dee26a9f | 1310 | |
5caf2a00 CM |
1311 | path = btrfs_alloc_path(); |
1312 | BUG_ON(!path); | |
1313 | btrfs_init_path(path); | |
fabb5681 | 1314 | if (create & BTRFS_GET_BLOCK_CREATE) { |
6567e837 | 1315 | WARN_ON(1); |
1de037a4 CM |
1316 | /* this almost but not quite works */ |
1317 | trans = btrfs_start_transaction(root, 1); | |
1318 | if (!trans) { | |
1319 | err = -ENOMEM; | |
1320 | goto out; | |
1321 | } | |
1322 | ret = drop_extents(trans, root, inode, | |
1323 | iblock << inode->i_blkbits, | |
1324 | (iblock + 1) << inode->i_blkbits, | |
1325 | &alloc_hint); | |
1326 | BUG_ON(ret); | |
6567e837 | 1327 | } |
dee26a9f | 1328 | |
236454df | 1329 | ret = btrfs_lookup_file_extent(NULL, root, path, |
9773a788 | 1330 | inode->i_ino, |
236454df | 1331 | iblock << inode->i_blkbits, 0); |
dee26a9f | 1332 | if (ret < 0) { |
dee26a9f CM |
1333 | err = ret; |
1334 | goto out; | |
1335 | } | |
1336 | ||
1337 | if (ret != 0) { | |
5caf2a00 CM |
1338 | if (path->slots[0] == 0) { |
1339 | btrfs_release_path(root, path); | |
1de037a4 | 1340 | goto not_found; |
dee26a9f | 1341 | } |
5caf2a00 | 1342 | path->slots[0]--; |
dee26a9f CM |
1343 | } |
1344 | ||
5caf2a00 | 1345 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 1346 | struct btrfs_file_extent_item); |
5caf2a00 | 1347 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
1348 | blocknr = btrfs_file_extent_disk_blocknr(item); |
1349 | blocknr += btrfs_file_extent_offset(item); | |
1350 | ||
dee26a9f | 1351 | /* are we inside the extent that was found? */ |
5caf2a00 | 1352 | found_key = &leaf->items[path->slots[0]].key; |
236454df | 1353 | found_type = btrfs_disk_key_type(found_key); |
dee26a9f | 1354 | if (btrfs_disk_key_objectid(found_key) != objectid || |
236454df | 1355 | found_type != BTRFS_EXTENT_DATA_KEY) { |
dee26a9f CM |
1356 | extent_end = 0; |
1357 | extent_start = 0; | |
1de037a4 | 1358 | goto not_found; |
dee26a9f | 1359 | } |
236454df CM |
1360 | found_type = btrfs_file_extent_type(item); |
1361 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1362 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1363 | extent_start = extent_start >> inode->i_blkbits; | |
1364 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
3a686375 | 1365 | err = 0; |
1de037a4 | 1366 | if (btrfs_file_extent_disk_blocknr(item) == 0) |
3a686375 | 1367 | goto out; |
236454df | 1368 | if (iblock >= extent_start && iblock < extent_end) { |
236454df CM |
1369 | btrfs_map_bh_to_logical(root, result, blocknr + |
1370 | iblock - extent_start); | |
1371 | goto out; | |
1372 | } | |
1373 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1374 | char *ptr; | |
1375 | char *map; | |
1376 | u32 size; | |
fabb5681 CM |
1377 | |
1378 | if (create & BTRFS_GET_BLOCK_NO_DIRECT) { | |
1379 | err = -EINVAL; | |
1380 | goto out; | |
1381 | } | |
236454df CM |
1382 | size = btrfs_file_extent_inline_len(leaf->items + |
1383 | path->slots[0]); | |
1384 | extent_end = (extent_start + size) >> inode->i_blkbits; | |
1385 | extent_start >>= inode->i_blkbits; | |
1386 | if (iblock < extent_start || iblock > extent_end) { | |
1de037a4 | 1387 | goto not_found; |
236454df CM |
1388 | } |
1389 | ptr = btrfs_file_extent_inline_start(item); | |
1390 | map = kmap(result->b_page); | |
1391 | memcpy(map, ptr, size); | |
1392 | memset(map + size, 0, PAGE_CACHE_SIZE - size); | |
1393 | flush_dcache_page(result->b_page); | |
1394 | kunmap(result->b_page); | |
1395 | set_buffer_uptodate(result); | |
1396 | SetPageChecked(result->b_page); | |
1397 | btrfs_map_bh_to_logical(root, result, 0); | |
dee26a9f | 1398 | } |
1de037a4 | 1399 | not_found: |
fabb5681 | 1400 | if (create & BTRFS_GET_BLOCK_CREATE) { |
1de037a4 CM |
1401 | struct btrfs_key ins; |
1402 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, | |
1403 | 1, alloc_hint, (u64)-1, | |
1404 | &ins, 1); | |
1405 | BUG_ON(ret); | |
1406 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
1407 | iblock << inode->i_blkbits, | |
1408 | ins.objectid, ins.offset, | |
1409 | ins.offset); | |
1410 | BUG_ON(ret); | |
1411 | SetPageChecked(result->b_page); | |
1412 | btrfs_map_bh_to_logical(root, result, ins.objectid); | |
1413 | } | |
dee26a9f | 1414 | out: |
1de037a4 CM |
1415 | if (trans) |
1416 | err = btrfs_end_transaction(trans, root); | |
5caf2a00 | 1417 | btrfs_free_path(path); |
75dfe396 CM |
1418 | return err; |
1419 | } | |
1420 | ||
1421 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1422 | struct buffer_head *result, int create) | |
1423 | { | |
1424 | int err; | |
d6e4a428 | 1425 | struct btrfs_root *root = BTRFS_I(inode)->root; |
75dfe396 | 1426 | mutex_lock(&root->fs_info->fs_mutex); |
e8f05c45 | 1427 | err = btrfs_get_block_lock(inode, iblock, result, create); |
dee26a9f CM |
1428 | mutex_unlock(&root->fs_info->fs_mutex); |
1429 | return err; | |
1430 | } | |
1431 | ||
fabb5681 CM |
1432 | static int btrfs_get_block_bmap(struct inode *inode, sector_t iblock, |
1433 | struct buffer_head *result, int create) | |
1434 | { | |
1435 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1436 | mutex_lock(&root->fs_info->fs_mutex); | |
1437 | btrfs_get_block_lock(inode, iblock, result, BTRFS_GET_BLOCK_NO_DIRECT); | |
1438 | mutex_unlock(&root->fs_info->fs_mutex); | |
1439 | return 0; | |
1440 | } | |
1441 | ||
1442 | static sector_t btrfs_bmap(struct address_space *as, sector_t block) | |
1443 | { | |
1444 | return generic_block_bmap(as, block, btrfs_get_block_bmap); | |
1445 | } | |
1446 | ||
dee26a9f CM |
1447 | static int btrfs_prepare_write(struct file *file, struct page *page, |
1448 | unsigned from, unsigned to) | |
1449 | { | |
1de037a4 | 1450 | return block_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f CM |
1451 | } |
1452 | ||
d561c025 CM |
1453 | static void btrfs_write_super(struct super_block *sb) |
1454 | { | |
1455 | btrfs_sync_fs(sb, 1); | |
1456 | } | |
1457 | ||
dee26a9f CM |
1458 | static int btrfs_readpage(struct file *file, struct page *page) |
1459 | { | |
1460 | return mpage_readpage(page, btrfs_get_block); | |
1461 | } | |
1462 | ||
236454df CM |
1463 | /* |
1464 | * While block_write_full_page is writing back the dirty buffers under | |
1465 | * the page lock, whoever dirtied the buffers may decide to clean them | |
1466 | * again at any time. We handle that by only looking at the buffer | |
1467 | * state inside lock_buffer(). | |
1468 | * | |
1469 | * If block_write_full_page() is called for regular writeback | |
1470 | * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a | |
1471 | * locked buffer. This only can happen if someone has written the buffer | |
1472 | * directly, with submit_bh(). At the address_space level PageWriteback | |
1473 | * prevents this contention from occurring. | |
1474 | */ | |
1475 | static int __btrfs_write_full_page(struct inode *inode, struct page *page, | |
1476 | struct writeback_control *wbc) | |
1477 | { | |
1478 | int err; | |
1479 | sector_t block; | |
1480 | sector_t last_block; | |
1481 | struct buffer_head *bh, *head; | |
1482 | const unsigned blocksize = 1 << inode->i_blkbits; | |
1483 | int nr_underway = 0; | |
1484 | ||
1485 | BUG_ON(!PageLocked(page)); | |
1486 | ||
1487 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; | |
1488 | ||
1489 | if (!page_has_buffers(page)) { | |
1490 | create_empty_buffers(page, blocksize, | |
1491 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
1492 | } | |
1493 | ||
1494 | /* | |
1495 | * Be very careful. We have no exclusion from __set_page_dirty_buffers | |
1496 | * here, and the (potentially unmapped) buffers may become dirty at | |
1497 | * any time. If a buffer becomes dirty here after we've inspected it | |
1498 | * then we just miss that fact, and the page stays dirty. | |
1499 | * | |
1500 | * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; | |
1501 | * handle that here by just cleaning them. | |
1502 | */ | |
1503 | ||
1504 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1505 | head = page_buffers(page); | |
1506 | bh = head; | |
1507 | ||
1508 | /* | |
1509 | * Get all the dirty buffers mapped to disk addresses and | |
1510 | * handle any aliases from the underlying blockdev's mapping. | |
1511 | */ | |
1512 | do { | |
1513 | if (block > last_block) { | |
1514 | /* | |
1515 | * mapped buffers outside i_size will occur, because | |
1516 | * this page can be outside i_size when there is a | |
1517 | * truncate in progress. | |
1518 | */ | |
1519 | /* | |
1520 | * The buffer was zeroed by block_write_full_page() | |
1521 | */ | |
1522 | clear_buffer_dirty(bh); | |
1523 | set_buffer_uptodate(bh); | |
1524 | } else if (!buffer_mapped(bh) && buffer_dirty(bh)) { | |
1525 | WARN_ON(bh->b_size != blocksize); | |
1526 | err = btrfs_get_block(inode, block, bh, 0); | |
35b7e476 CM |
1527 | if (err) { |
1528 | printk("writepage going to recovery err %d\n", err); | |
236454df | 1529 | goto recover; |
35b7e476 | 1530 | } |
236454df CM |
1531 | if (buffer_new(bh)) { |
1532 | /* blockdev mappings never come here */ | |
1533 | clear_buffer_new(bh); | |
236454df CM |
1534 | } |
1535 | } | |
1536 | bh = bh->b_this_page; | |
1537 | block++; | |
1538 | } while (bh != head); | |
1539 | ||
1540 | do { | |
1541 | if (!buffer_mapped(bh)) | |
1542 | continue; | |
1543 | /* | |
1544 | * If it's a fully non-blocking write attempt and we cannot | |
1545 | * lock the buffer then redirty the page. Note that this can | |
1546 | * potentially cause a busy-wait loop from pdflush and kswapd | |
1547 | * activity, but those code paths have their own higher-level | |
1548 | * throttling. | |
1549 | */ | |
1550 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
1551 | lock_buffer(bh); | |
1552 | } else if (test_set_buffer_locked(bh)) { | |
1553 | redirty_page_for_writepage(wbc, page); | |
1554 | continue; | |
1555 | } | |
1556 | if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) { | |
1557 | mark_buffer_async_write(bh); | |
1558 | } else { | |
1559 | unlock_buffer(bh); | |
1560 | } | |
1561 | } while ((bh = bh->b_this_page) != head); | |
1562 | ||
1563 | /* | |
1564 | * The page and its buffers are protected by PageWriteback(), so we can | |
1565 | * drop the bh refcounts early. | |
1566 | */ | |
1567 | BUG_ON(PageWriteback(page)); | |
1568 | set_page_writeback(page); | |
1569 | ||
1570 | do { | |
1571 | struct buffer_head *next = bh->b_this_page; | |
1572 | if (buffer_async_write(bh)) { | |
1573 | submit_bh(WRITE, bh); | |
1574 | nr_underway++; | |
1575 | } | |
1576 | bh = next; | |
1577 | } while (bh != head); | |
1578 | unlock_page(page); | |
1579 | ||
1580 | err = 0; | |
1581 | done: | |
1582 | if (nr_underway == 0) { | |
1583 | /* | |
1584 | * The page was marked dirty, but the buffers were | |
1585 | * clean. Someone wrote them back by hand with | |
1586 | * ll_rw_block/submit_bh. A rare case. | |
1587 | */ | |
1588 | int uptodate = 1; | |
1589 | do { | |
1590 | if (!buffer_uptodate(bh)) { | |
1591 | uptodate = 0; | |
1592 | break; | |
1593 | } | |
1594 | bh = bh->b_this_page; | |
1595 | } while (bh != head); | |
1596 | if (uptodate) | |
1597 | SetPageUptodate(page); | |
1598 | end_page_writeback(page); | |
236454df CM |
1599 | } |
1600 | return err; | |
1601 | ||
1602 | recover: | |
1603 | /* | |
1604 | * ENOSPC, or some other error. We may already have added some | |
1605 | * blocks to the file, so we need to write these out to avoid | |
1606 | * exposing stale data. | |
1607 | * The page is currently locked and not marked for writeback | |
1608 | */ | |
1609 | bh = head; | |
1610 | /* Recovery: lock and submit the mapped buffers */ | |
1611 | do { | |
1612 | if (buffer_mapped(bh) && buffer_dirty(bh)) { | |
1613 | lock_buffer(bh); | |
1614 | mark_buffer_async_write(bh); | |
1615 | } else { | |
1616 | /* | |
1617 | * The buffer may have been set dirty during | |
1618 | * attachment to a dirty page. | |
1619 | */ | |
1620 | clear_buffer_dirty(bh); | |
1621 | } | |
1622 | } while ((bh = bh->b_this_page) != head); | |
1623 | SetPageError(page); | |
1624 | BUG_ON(PageWriteback(page)); | |
1625 | set_page_writeback(page); | |
1626 | do { | |
1627 | struct buffer_head *next = bh->b_this_page; | |
1628 | if (buffer_async_write(bh)) { | |
1629 | clear_buffer_dirty(bh); | |
1630 | submit_bh(WRITE, bh); | |
1631 | nr_underway++; | |
1632 | } | |
1633 | bh = next; | |
1634 | } while (bh != head); | |
1635 | unlock_page(page); | |
1636 | goto done; | |
1637 | } | |
1638 | ||
1639 | /* | |
1640 | * The generic ->writepage function for buffer-backed address_spaces | |
1641 | */ | |
dee26a9f CM |
1642 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
1643 | { | |
236454df CM |
1644 | struct inode * const inode = page->mapping->host; |
1645 | loff_t i_size = i_size_read(inode); | |
1646 | const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
1647 | unsigned offset; | |
1648 | void *kaddr; | |
1649 | ||
1650 | /* Is the page fully inside i_size? */ | |
1651 | if (page->index < end_index) | |
1652 | return __btrfs_write_full_page(inode, page, wbc); | |
1653 | ||
1654 | /* Is the page fully outside i_size? (truncate in progress) */ | |
1655 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
1656 | if (page->index >= end_index+1 || !offset) { | |
1657 | /* | |
1658 | * The page may have dirty, unmapped buffers. For example, | |
1659 | * they may have been added in ext3_writepage(). Make them | |
1660 | * freeable here, so the page does not leak. | |
1661 | */ | |
1662 | block_invalidatepage(page, 0); | |
1663 | unlock_page(page); | |
1664 | return 0; /* don't care */ | |
1665 | } | |
1666 | ||
1667 | /* | |
1668 | * The page straddles i_size. It must be zeroed out on each and every | |
1669 | * writepage invokation because it may be mmapped. "A file is mapped | |
1670 | * in multiples of the page size. For a file that is not a multiple of | |
1671 | * the page size, the remaining memory is zeroed when mapped, and | |
1672 | * writes to that region are not written out to the file." | |
1673 | */ | |
1674 | kaddr = kmap_atomic(page, KM_USER0); | |
1675 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1676 | flush_dcache_page(page); | |
1677 | kunmap_atomic(kaddr, KM_USER0); | |
1678 | return __btrfs_write_full_page(inode, page, wbc); | |
dee26a9f | 1679 | } |
d561c025 | 1680 | |
f4b9aa8d CM |
1681 | static void btrfs_truncate(struct inode *inode) |
1682 | { | |
d6e4a428 | 1683 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
1684 | int ret; |
1685 | struct btrfs_trans_handle *trans; | |
1686 | ||
1687 | if (!S_ISREG(inode->i_mode)) | |
1688 | return; | |
1689 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1690 | return; | |
1691 | ||
1de037a4 | 1692 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d | 1693 | |
f4b9aa8d CM |
1694 | mutex_lock(&root->fs_info->fs_mutex); |
1695 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1696 | btrfs_set_trans_block_group(trans, inode); |
1de037a4 CM |
1697 | |
1698 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
f4b9aa8d CM |
1699 | ret = btrfs_truncate_in_trans(trans, root, inode); |
1700 | BUG_ON(ret); | |
35b7e476 | 1701 | btrfs_update_inode(trans, root, inode); |
f4b9aa8d CM |
1702 | ret = btrfs_end_transaction(trans, root); |
1703 | BUG_ON(ret); | |
1704 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 1705 | btrfs_btree_balance_dirty(root); |
f4b9aa8d CM |
1706 | } |
1707 | ||
236454df CM |
1708 | static int btrfs_commit_write(struct file *file, struct page *page, |
1709 | unsigned from, unsigned to) | |
1710 | { | |
1711 | struct inode *inode = page->mapping->host; | |
1712 | struct buffer_head *bh; | |
1713 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1714 | ||
1715 | SetPageUptodate(page); | |
1716 | bh = page_buffers(page); | |
1de037a4 | 1717 | set_buffer_uptodate(bh); |
236454df CM |
1718 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { |
1719 | set_page_dirty(page); | |
1720 | } | |
1721 | if (pos > inode->i_size) { | |
1722 | i_size_write(inode, pos); | |
1723 | mark_inode_dirty(inode); | |
1724 | } | |
1725 | return 0; | |
1726 | } | |
1727 | ||
75dfe396 CM |
1728 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1729 | struct page **prepared_pages, | |
1730 | const char __user * buf) | |
1731 | { | |
1732 | long page_fault = 0; | |
1733 | int i; | |
1734 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1735 | ||
1736 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1737 | size_t count = min_t(size_t, | |
1738 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1739 | struct page *page = prepared_pages[i]; | |
1740 | fault_in_pages_readable(buf, count); | |
1741 | ||
1742 | /* Copy data from userspace to the current page */ | |
1743 | kmap(page); | |
1744 | page_fault = __copy_from_user(page_address(page) + offset, | |
1745 | buf, count); | |
1746 | /* Flush processor's dcache for this page */ | |
1747 | flush_dcache_page(page); | |
1748 | kunmap(page); | |
1749 | buf += count; | |
1750 | write_bytes -= count; | |
1751 | ||
1752 | if (page_fault) | |
1753 | break; | |
1754 | } | |
1755 | return page_fault ? -EFAULT : 0; | |
1756 | } | |
1757 | ||
1758 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1759 | { | |
1760 | size_t i; | |
1761 | for (i = 0; i < num_pages; i++) { | |
1762 | if (!pages[i]) | |
1763 | break; | |
1764 | unlock_page(pages[i]); | |
1765 | mark_page_accessed(pages[i]); | |
1766 | page_cache_release(pages[i]); | |
1767 | } | |
1768 | } | |
1769 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1770 | struct btrfs_root *root, | |
1771 | struct file *file, | |
1772 | struct page **pages, | |
1773 | size_t num_pages, | |
1774 | loff_t pos, | |
1775 | size_t write_bytes) | |
1776 | { | |
1777 | int i; | |
1778 | int offset; | |
1779 | int err = 0; | |
1780 | int ret; | |
1781 | int this_write; | |
f254e52c | 1782 | struct inode *inode = file->f_path.dentry->d_inode; |
236454df CM |
1783 | struct buffer_head *bh; |
1784 | struct btrfs_file_extent_item *ei; | |
75dfe396 CM |
1785 | |
1786 | for (i = 0; i < num_pages; i++) { | |
1787 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1788 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1789 | /* FIXME, one block at a time */ |
1790 | ||
1791 | mutex_lock(&root->fs_info->fs_mutex); | |
1792 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1793 | btrfs_set_trans_block_group(trans, inode); |
236454df CM |
1794 | |
1795 | bh = page_buffers(pages[i]); | |
1796 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
1797 | struct btrfs_key key; | |
1798 | struct btrfs_path *path; | |
1799 | char *ptr; | |
1800 | u32 datasize; | |
1801 | ||
1802 | path = btrfs_alloc_path(); | |
1803 | BUG_ON(!path); | |
1804 | key.objectid = inode->i_ino; | |
1805 | key.offset = pages[i]->index << PAGE_CACHE_SHIFT; | |
1806 | key.flags = 0; | |
1807 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
1808 | BUG_ON(write_bytes >= PAGE_CACHE_SIZE); | |
1809 | datasize = offset + | |
1810 | btrfs_file_extent_calc_inline_size(write_bytes); | |
1811 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1812 | datasize); | |
1813 | BUG_ON(ret); | |
1814 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1815 | path->slots[0], struct btrfs_file_extent_item); | |
1816 | btrfs_set_file_extent_generation(ei, trans->transid); | |
1817 | btrfs_set_file_extent_type(ei, | |
1818 | BTRFS_FILE_EXTENT_INLINE); | |
1819 | ptr = btrfs_file_extent_inline_start(ei); | |
098f59c2 CM |
1820 | btrfs_memcpy(root, path->nodes[0]->b_data, |
1821 | ptr, bh->b_data, offset + write_bytes); | |
236454df CM |
1822 | mark_buffer_dirty(path->nodes[0]); |
1823 | btrfs_free_path(path); | |
3a686375 | 1824 | } else if (buffer_mapped(bh)) { |
236454df | 1825 | btrfs_csum_file_block(trans, root, inode->i_ino, |
f254e52c CM |
1826 | pages[i]->index << PAGE_CACHE_SHIFT, |
1827 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
236454df CM |
1828 | kunmap(pages[i]); |
1829 | } | |
f254e52c | 1830 | SetPageChecked(pages[i]); |
e37c9e69 | 1831 | // btrfs_update_inode_block_group(trans, inode); |
f254e52c CM |
1832 | ret = btrfs_end_transaction(trans, root); |
1833 | BUG_ON(ret); | |
1834 | mutex_unlock(&root->fs_info->fs_mutex); | |
1835 | ||
236454df | 1836 | ret = btrfs_commit_write(file, pages[i], offset, |
75dfe396 CM |
1837 | offset + this_write); |
1838 | pos += this_write; | |
1839 | if (ret) { | |
1840 | err = ret; | |
1841 | goto failed; | |
1842 | } | |
1843 | WARN_ON(this_write > write_bytes); | |
1844 | write_bytes -= this_write; | |
1845 | } | |
1846 | failed: | |
1847 | return err; | |
1848 | } | |
1849 | ||
b18c6685 CM |
1850 | static int drop_extents(struct btrfs_trans_handle *trans, |
1851 | struct btrfs_root *root, | |
1852 | struct inode *inode, | |
de428b63 | 1853 | u64 start, u64 end, u64 *hint_block) |
b18c6685 CM |
1854 | { |
1855 | int ret; | |
1856 | struct btrfs_key key; | |
1857 | struct btrfs_leaf *leaf; | |
1858 | int slot; | |
1859 | struct btrfs_file_extent_item *extent; | |
236454df | 1860 | u64 extent_end = 0; |
b18c6685 CM |
1861 | int keep; |
1862 | struct btrfs_file_extent_item old; | |
1863 | struct btrfs_path *path; | |
1864 | u64 search_start = start; | |
1865 | int bookend; | |
236454df CM |
1866 | int found_type; |
1867 | int found_extent; | |
1868 | int found_inline; | |
1869 | ||
b18c6685 CM |
1870 | path = btrfs_alloc_path(); |
1871 | if (!path) | |
1872 | return -ENOMEM; | |
a429e513 CM |
1873 | while(1) { |
1874 | btrfs_release_path(root, path); | |
1875 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
1876 | search_start, -1); | |
1877 | if (ret < 0) | |
70b2befd | 1878 | goto out; |
a429e513 CM |
1879 | if (ret > 0) { |
1880 | if (path->slots[0] == 0) { | |
236454df | 1881 | ret = 0; |
a429e513 CM |
1882 | goto out; |
1883 | } | |
1884 | path->slots[0]--; | |
70b2befd | 1885 | } |
b18c6685 CM |
1886 | keep = 0; |
1887 | bookend = 0; | |
236454df CM |
1888 | found_extent = 0; |
1889 | found_inline = 0; | |
1890 | extent = NULL; | |
b18c6685 CM |
1891 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
1892 | slot = path->slots[0]; | |
1893 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
b18c6685 CM |
1894 | if (key.offset >= end || key.objectid != inode->i_ino) { |
1895 | ret = 0; | |
1896 | goto out; | |
1897 | } | |
236454df CM |
1898 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) { |
1899 | ret = 0; | |
1900 | goto out; | |
1901 | } | |
1902 | extent = btrfs_item_ptr(leaf, slot, | |
1903 | struct btrfs_file_extent_item); | |
1904 | found_type = btrfs_file_extent_type(extent); | |
1905 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1906 | extent_end = key.offset + | |
1907 | (btrfs_file_extent_num_blocks(extent) << | |
1908 | inode->i_blkbits); | |
1909 | found_extent = 1; | |
1910 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1911 | found_inline = 1; | |
1912 | extent_end = key.offset + | |
1913 | btrfs_file_extent_inline_len(leaf->items + slot); | |
1914 | } | |
1915 | ||
1916 | if (!found_extent && !found_inline) { | |
1917 | ret = 0; | |
a429e513 | 1918 | goto out; |
236454df CM |
1919 | } |
1920 | ||
1921 | if (search_start >= extent_end) { | |
1922 | ret = 0; | |
a429e513 | 1923 | goto out; |
236454df CM |
1924 | } |
1925 | ||
3a686375 CM |
1926 | if (found_inline) { |
1927 | u64 mask = root->blocksize - 1; | |
1928 | search_start = (extent_end + mask) & ~mask; | |
1929 | } else | |
1930 | search_start = extent_end; | |
b18c6685 CM |
1931 | |
1932 | if (end < extent_end && end >= key.offset) { | |
236454df | 1933 | if (found_extent) { |
3a686375 CM |
1934 | u64 disk_blocknr = |
1935 | btrfs_file_extent_disk_blocknr(extent); | |
1936 | u64 disk_num_blocks = | |
1937 | btrfs_file_extent_disk_num_blocks(extent); | |
236454df | 1938 | memcpy(&old, extent, sizeof(old)); |
3a686375 CM |
1939 | if (disk_blocknr != 0) { |
1940 | ret = btrfs_inc_extent_ref(trans, root, | |
1941 | disk_blocknr, disk_num_blocks); | |
1942 | BUG_ON(ret); | |
1943 | } | |
236454df CM |
1944 | } |
1945 | WARN_ON(found_inline); | |
b18c6685 CM |
1946 | bookend = 1; |
1947 | } | |
1948 | ||
1949 | if (start > key.offset) { | |
1950 | u64 new_num; | |
a429e513 | 1951 | u64 old_num; |
b18c6685 CM |
1952 | /* truncate existing extent */ |
1953 | keep = 1; | |
1954 | WARN_ON(start & (root->blocksize - 1)); | |
236454df CM |
1955 | if (found_extent) { |
1956 | new_num = (start - key.offset) >> | |
1957 | inode->i_blkbits; | |
1958 | old_num = btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1959 | *hint_block = |
1960 | btrfs_file_extent_disk_blocknr(extent); | |
3a686375 CM |
1961 | if (btrfs_file_extent_disk_blocknr(extent)) { |
1962 | inode->i_blocks -= | |
1963 | (old_num - new_num) << 3; | |
1964 | } | |
236454df CM |
1965 | btrfs_set_file_extent_num_blocks(extent, |
1966 | new_num); | |
1967 | mark_buffer_dirty(path->nodes[0]); | |
1968 | } else { | |
1969 | WARN_ON(1); | |
236454df | 1970 | } |
b18c6685 CM |
1971 | } |
1972 | if (!keep) { | |
236454df CM |
1973 | u64 disk_blocknr = 0; |
1974 | u64 disk_num_blocks = 0; | |
1975 | u64 extent_num_blocks = 0; | |
1976 | if (found_extent) { | |
1977 | disk_blocknr = | |
1978 | btrfs_file_extent_disk_blocknr(extent); | |
1979 | disk_num_blocks = | |
1980 | btrfs_file_extent_disk_num_blocks(extent); | |
1981 | extent_num_blocks = | |
1982 | btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1983 | *hint_block = |
1984 | btrfs_file_extent_disk_blocknr(extent); | |
236454df | 1985 | } |
b18c6685 CM |
1986 | ret = btrfs_del_item(trans, root, path); |
1987 | BUG_ON(ret); | |
1988 | btrfs_release_path(root, path); | |
098f59c2 | 1989 | extent = NULL; |
3a686375 | 1990 | if (found_extent && disk_blocknr != 0) { |
098f59c2 | 1991 | inode->i_blocks -= extent_num_blocks << 3; |
236454df CM |
1992 | ret = btrfs_free_extent(trans, root, |
1993 | disk_blocknr, | |
1994 | disk_num_blocks, 0); | |
1995 | } | |
b18c6685 CM |
1996 | |
1997 | BUG_ON(ret); | |
1998 | if (!bookend && search_start >= end) { | |
1999 | ret = 0; | |
2000 | goto out; | |
2001 | } | |
2002 | if (!bookend) | |
a429e513 | 2003 | continue; |
b18c6685 | 2004 | } |
236454df | 2005 | if (bookend && found_extent) { |
b18c6685 CM |
2006 | /* create bookend */ |
2007 | struct btrfs_key ins; | |
b18c6685 CM |
2008 | ins.objectid = inode->i_ino; |
2009 | ins.offset = end; | |
2010 | ins.flags = 0; | |
2011 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); | |
2012 | ||
2013 | btrfs_release_path(root, path); | |
b18c6685 CM |
2014 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
2015 | sizeof(*extent)); | |
2016 | BUG_ON(ret); | |
2017 | extent = btrfs_item_ptr( | |
2018 | btrfs_buffer_leaf(path->nodes[0]), | |
2019 | path->slots[0], | |
2020 | struct btrfs_file_extent_item); | |
2021 | btrfs_set_file_extent_disk_blocknr(extent, | |
2022 | btrfs_file_extent_disk_blocknr(&old)); | |
2023 | btrfs_set_file_extent_disk_num_blocks(extent, | |
2024 | btrfs_file_extent_disk_num_blocks(&old)); | |
2025 | ||
2026 | btrfs_set_file_extent_offset(extent, | |
2027 | btrfs_file_extent_offset(&old) + | |
2028 | ((end - key.offset) >> inode->i_blkbits)); | |
2029 | WARN_ON(btrfs_file_extent_num_blocks(&old) < | |
3a686375 | 2030 | (extent_end - end) >> inode->i_blkbits); |
b18c6685 | 2031 | btrfs_set_file_extent_num_blocks(extent, |
3a686375 | 2032 | (extent_end - end) >> inode->i_blkbits); |
b18c6685 | 2033 | |
236454df CM |
2034 | btrfs_set_file_extent_type(extent, |
2035 | BTRFS_FILE_EXTENT_REG); | |
b18c6685 CM |
2036 | btrfs_set_file_extent_generation(extent, |
2037 | btrfs_file_extent_generation(&old)); | |
b18c6685 | 2038 | btrfs_mark_buffer_dirty(path->nodes[0]); |
3a686375 CM |
2039 | if (btrfs_file_extent_disk_blocknr(&old) != 0) { |
2040 | inode->i_blocks += | |
2041 | btrfs_file_extent_num_blocks(extent) << 3; | |
2042 | } | |
b18c6685 | 2043 | ret = 0; |
70b2befd | 2044 | goto out; |
b18c6685 | 2045 | } |
b18c6685 | 2046 | } |
b18c6685 | 2047 | out: |
b18c6685 CM |
2048 | btrfs_free_path(path); |
2049 | return ret; | |
2050 | } | |
2051 | ||
2052 | static int prepare_pages(struct btrfs_root *root, | |
75dfe396 CM |
2053 | struct file *file, |
2054 | struct page **pages, | |
2055 | size_t num_pages, | |
2056 | loff_t pos, | |
2932f3ec CM |
2057 | unsigned long first_index, |
2058 | unsigned long last_index, | |
6567e837 CM |
2059 | size_t write_bytes, |
2060 | u64 alloc_extent_start) | |
75dfe396 CM |
2061 | { |
2062 | int i; | |
2063 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
2064 | struct inode *inode = file->f_path.dentry->d_inode; | |
2065 | int offset; | |
2066 | int err = 0; | |
75dfe396 | 2067 | int this_write; |
6567e837 CM |
2068 | struct buffer_head *bh; |
2069 | struct buffer_head *head; | |
75dfe396 CM |
2070 | loff_t isize = i_size_read(inode); |
2071 | ||
2072 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
2073 | ||
2074 | for (i = 0; i < num_pages; i++) { | |
2075 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
2076 | if (!pages[i]) { | |
2077 | err = -ENOMEM; | |
2078 | goto failed_release; | |
2079 | } | |
35b7e476 CM |
2080 | cancel_dirty_page(pages[i], PAGE_CACHE_SIZE); |
2081 | wait_on_page_writeback(pages[i]); | |
75dfe396 CM |
2082 | offset = pos & (PAGE_CACHE_SIZE -1); |
2083 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
35b7e476 CM |
2084 | if (!page_has_buffers(pages[i])) { |
2085 | create_empty_buffers(pages[i], | |
2086 | root->fs_info->sb->s_blocksize, | |
2087 | (1 << BH_Uptodate)); | |
2088 | } | |
6567e837 CM |
2089 | head = page_buffers(pages[i]); |
2090 | bh = head; | |
2091 | do { | |
2092 | err = btrfs_map_bh_to_logical(root, bh, | |
2093 | alloc_extent_start); | |
2094 | BUG_ON(err); | |
2095 | if (err) | |
2096 | goto failed_truncate; | |
2097 | bh = bh->b_this_page; | |
236454df CM |
2098 | if (alloc_extent_start) |
2099 | alloc_extent_start++; | |
6567e837 | 2100 | } while (bh != head); |
75dfe396 | 2101 | pos += this_write; |
75dfe396 CM |
2102 | WARN_ON(this_write > write_bytes); |
2103 | write_bytes -= this_write; | |
2104 | } | |
2105 | return 0; | |
2106 | ||
2107 | failed_release: | |
2108 | btrfs_drop_pages(pages, num_pages); | |
2109 | return err; | |
2110 | ||
2111 | failed_truncate: | |
2112 | btrfs_drop_pages(pages, num_pages); | |
2113 | if (pos > isize) | |
2114 | vmtruncate(inode, isize); | |
2115 | return err; | |
2116 | } | |
2117 | ||
2118 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
2119 | size_t count, loff_t *ppos) | |
2120 | { | |
2121 | loff_t pos; | |
2122 | size_t num_written = 0; | |
2123 | int err = 0; | |
2124 | int ret = 0; | |
75dfe396 | 2125 | struct inode *inode = file->f_path.dentry->d_inode; |
d6e4a428 | 2126 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b18c6685 | 2127 | struct page *pages[8]; |
35b7e476 | 2128 | struct page *pinned[2]; |
2932f3ec CM |
2129 | unsigned long first_index; |
2130 | unsigned long last_index; | |
6567e837 CM |
2131 | u64 start_pos; |
2132 | u64 num_blocks; | |
2133 | u64 alloc_extent_start; | |
de428b63 | 2134 | u64 hint_block; |
6567e837 | 2135 | struct btrfs_trans_handle *trans; |
b18c6685 | 2136 | struct btrfs_key ins; |
35b7e476 CM |
2137 | pinned[0] = NULL; |
2138 | pinned[1] = NULL; | |
75dfe396 CM |
2139 | if (file->f_flags & O_DIRECT) |
2140 | return -EINVAL; | |
2141 | pos = *ppos; | |
75dfe396 CM |
2142 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
2143 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
2144 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
2145 | if (err) | |
2146 | goto out; | |
2147 | if (count == 0) | |
2148 | goto out; | |
2149 | err = remove_suid(file->f_path.dentry); | |
2150 | if (err) | |
2151 | goto out; | |
2152 | file_update_time(file); | |
a429e513 CM |
2153 | |
2154 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); | |
2155 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> | |
2156 | inode->i_blkbits; | |
2157 | ||
75dfe396 | 2158 | mutex_lock(&inode->i_mutex); |
2932f3ec CM |
2159 | first_index = pos >> PAGE_CACHE_SHIFT; |
2160 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
6567e837 | 2161 | |
1de037a4 | 2162 | if ((pos & (PAGE_CACHE_SIZE - 1))) { |
a429e513 CM |
2163 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); |
2164 | if (!PageUptodate(pinned[0])) { | |
2165 | ret = mpage_readpage(pinned[0], btrfs_get_block); | |
2166 | BUG_ON(ret); | |
35b7e476 | 2167 | wait_on_page_locked(pinned[0]); |
a429e513 CM |
2168 | } else { |
2169 | unlock_page(pinned[0]); | |
2170 | } | |
2171 | } | |
1de037a4 | 2172 | if ((pos + count) & (PAGE_CACHE_SIZE - 1)) { |
a429e513 CM |
2173 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); |
2174 | if (!PageUptodate(pinned[1])) { | |
2175 | ret = mpage_readpage(pinned[1], btrfs_get_block); | |
2176 | BUG_ON(ret); | |
35b7e476 | 2177 | wait_on_page_locked(pinned[1]); |
a429e513 CM |
2178 | } else { |
2179 | unlock_page(pinned[1]); | |
2180 | } | |
2181 | } | |
2182 | ||
6567e837 CM |
2183 | mutex_lock(&root->fs_info->fs_mutex); |
2184 | trans = btrfs_start_transaction(root, 1); | |
2185 | if (!trans) { | |
2186 | err = -ENOMEM; | |
b18c6685 | 2187 | mutex_unlock(&root->fs_info->fs_mutex); |
6567e837 CM |
2188 | goto out_unlock; |
2189 | } | |
31f3c99b | 2190 | btrfs_set_trans_block_group(trans, inode); |
a429e513 CM |
2191 | /* FIXME blocksize != 4096 */ |
2192 | inode->i_blocks += num_blocks << 3; | |
de428b63 | 2193 | hint_block = 0; |
b18c6685 | 2194 | if (start_pos < inode->i_size) { |
a429e513 | 2195 | /* FIXME blocksize != pagesize */ |
b18c6685 CM |
2196 | ret = drop_extents(trans, root, inode, |
2197 | start_pos, | |
2198 | (pos + count + root->blocksize -1) & | |
de428b63 | 2199 | ~((u64)root->blocksize - 1), &hint_block); |
236454df | 2200 | BUG_ON(ret); |
b18c6685 | 2201 | } |
3a686375 CM |
2202 | if (inode->i_size < start_pos) { |
2203 | u64 last_pos_in_file; | |
2204 | u64 hole_size; | |
2205 | u64 mask = root->blocksize - 1; | |
2206 | last_pos_in_file = (inode->i_size + mask) & ~mask; | |
2207 | hole_size = (start_pos - last_pos_in_file + mask) & ~mask; | |
2208 | hole_size >>= inode->i_blkbits; | |
2209 | if (last_pos_in_file < start_pos) { | |
2210 | ret = btrfs_insert_file_extent(trans, root, | |
2211 | inode->i_ino, | |
2212 | last_pos_in_file, | |
2213 | 0, 0, hole_size); | |
2214 | } | |
2215 | BUG_ON(ret); | |
2216 | } | |
236454df CM |
2217 | if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size || |
2218 | pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) { | |
4d775673 | 2219 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, |
de428b63 CM |
2220 | num_blocks, hint_block, (u64)-1, |
2221 | &ins, 1); | |
236454df CM |
2222 | BUG_ON(ret); |
2223 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
3a686375 CM |
2224 | start_pos, ins.objectid, ins.offset, |
2225 | ins.offset); | |
236454df CM |
2226 | BUG_ON(ret); |
2227 | } else { | |
2228 | ins.offset = 0; | |
2229 | ins.objectid = 0; | |
2230 | } | |
6567e837 | 2231 | BUG_ON(ret); |
b18c6685 | 2232 | alloc_extent_start = ins.objectid; |
e37c9e69 | 2233 | // btrfs_update_inode_block_group(trans, inode); |
b18c6685 | 2234 | ret = btrfs_end_transaction(trans, root); |
6567e837 CM |
2235 | mutex_unlock(&root->fs_info->fs_mutex); |
2236 | ||
75dfe396 CM |
2237 | while(count > 0) { |
2238 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
2239 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
2240 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
2241 | PAGE_CACHE_SHIFT; | |
b18c6685 CM |
2242 | |
2243 | memset(pages, 0, sizeof(pages)); | |
2244 | ret = prepare_pages(root, file, pages, num_pages, | |
6567e837 CM |
2245 | pos, first_index, last_index, |
2246 | write_bytes, alloc_extent_start); | |
75dfe396 | 2247 | BUG_ON(ret); |
b18c6685 | 2248 | |
6567e837 | 2249 | /* FIXME blocks != pagesize */ |
236454df CM |
2250 | if (alloc_extent_start) |
2251 | alloc_extent_start += num_pages; | |
75dfe396 CM |
2252 | ret = btrfs_copy_from_user(pos, num_pages, |
2253 | write_bytes, pages, buf); | |
2254 | BUG_ON(ret); | |
2255 | ||
f254e52c | 2256 | ret = dirty_and_release_pages(NULL, root, file, pages, |
70b2befd | 2257 | num_pages, pos, write_bytes); |
75dfe396 CM |
2258 | BUG_ON(ret); |
2259 | btrfs_drop_pages(pages, num_pages); | |
2260 | ||
75dfe396 CM |
2261 | buf += write_bytes; |
2262 | count -= write_bytes; | |
2263 | pos += write_bytes; | |
2264 | num_written += write_bytes; | |
2265 | ||
2266 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
35b7e476 | 2267 | btrfs_btree_balance_dirty(root); |
75dfe396 CM |
2268 | cond_resched(); |
2269 | } | |
6567e837 | 2270 | out_unlock: |
75dfe396 CM |
2271 | mutex_unlock(&inode->i_mutex); |
2272 | out: | |
a429e513 CM |
2273 | if (pinned[0]) |
2274 | page_cache_release(pinned[0]); | |
2275 | if (pinned[1]) | |
2276 | page_cache_release(pinned[1]); | |
75dfe396 CM |
2277 | *ppos = pos; |
2278 | current->backing_dev_info = NULL; | |
a429e513 | 2279 | mark_inode_dirty(inode); |
75dfe396 CM |
2280 | return num_written ? num_written : err; |
2281 | } | |
2282 | ||
f254e52c CM |
2283 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
2284 | unsigned long offset, unsigned long size) | |
2285 | { | |
2286 | char *kaddr; | |
2287 | unsigned long left, count = desc->count; | |
d6e4a428 | 2288 | struct inode *inode = page->mapping->host; |
f254e52c CM |
2289 | |
2290 | if (size > count) | |
2291 | size = count; | |
2292 | ||
2293 | if (!PageChecked(page)) { | |
2294 | /* FIXME, do it per block */ | |
d6e4a428 | 2295 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1de037a4 CM |
2296 | int ret; |
2297 | struct buffer_head *bh; | |
2298 | ||
2299 | if (page_has_buffers(page)) { | |
2300 | bh = page_buffers(page); | |
2301 | if (!buffer_mapped(bh)) { | |
2302 | SetPageChecked(page); | |
2303 | goto checked; | |
2304 | } | |
2305 | } | |
236454df | 2306 | |
1de037a4 | 2307 | ret = btrfs_csum_verify_file_block(root, |
236454df CM |
2308 | page->mapping->host->i_ino, |
2309 | page->index << PAGE_CACHE_SHIFT, | |
2310 | kmap(page), PAGE_CACHE_SIZE); | |
f254e52c | 2311 | if (ret) { |
3a686375 | 2312 | if (ret != -ENOENT) { |
1de037a4 | 2313 | printk("failed to verify ino %lu page %lu ret %d\n", |
3a686375 | 2314 | page->mapping->host->i_ino, |
1de037a4 CM |
2315 | page->index, ret); |
2316 | memset(page_address(page), 1, PAGE_CACHE_SIZE); | |
3a686375 CM |
2317 | flush_dcache_page(page); |
2318 | } | |
f254e52c CM |
2319 | } |
2320 | SetPageChecked(page); | |
2321 | kunmap(page); | |
2322 | } | |
1de037a4 | 2323 | checked: |
f254e52c CM |
2324 | /* |
2325 | * Faults on the destination of a read are common, so do it before | |
2326 | * taking the kmap. | |
2327 | */ | |
2328 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
2329 | kaddr = kmap_atomic(page, KM_USER0); | |
2330 | left = __copy_to_user_inatomic(desc->arg.buf, | |
2331 | kaddr + offset, size); | |
2332 | kunmap_atomic(kaddr, KM_USER0); | |
2333 | if (left == 0) | |
2334 | goto success; | |
2335 | } | |
2336 | ||
2337 | /* Do it the slow way */ | |
2338 | kaddr = kmap(page); | |
2339 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
2340 | kunmap(page); | |
2341 | ||
2342 | if (left) { | |
2343 | size -= left; | |
2344 | desc->error = -EFAULT; | |
2345 | } | |
2346 | success: | |
2347 | desc->count = count - size; | |
2348 | desc->written += size; | |
2349 | desc->arg.buf += size; | |
2350 | return size; | |
2351 | } | |
2352 | ||
2353 | /** | |
2354 | * btrfs_file_aio_read - filesystem read routine | |
2355 | * @iocb: kernel I/O control block | |
2356 | * @iov: io vector request | |
2357 | * @nr_segs: number of segments in the iovec | |
2358 | * @pos: current file position | |
2359 | */ | |
2360 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
2361 | unsigned long nr_segs, loff_t pos) | |
2362 | { | |
2363 | struct file *filp = iocb->ki_filp; | |
2364 | ssize_t retval; | |
2365 | unsigned long seg; | |
2366 | size_t count; | |
2367 | loff_t *ppos = &iocb->ki_pos; | |
2368 | ||
2369 | count = 0; | |
2370 | for (seg = 0; seg < nr_segs; seg++) { | |
2371 | const struct iovec *iv = &iov[seg]; | |
2372 | ||
2373 | /* | |
2374 | * If any segment has a negative length, or the cumulative | |
2375 | * length ever wraps negative then return -EINVAL. | |
2376 | */ | |
2377 | count += iv->iov_len; | |
2378 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
2379 | return -EINVAL; | |
2380 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
2381 | continue; | |
2382 | if (seg == 0) | |
2383 | return -EFAULT; | |
2384 | nr_segs = seg; | |
2385 | count -= iv->iov_len; /* This segment is no good */ | |
2386 | break; | |
2387 | } | |
2388 | retval = 0; | |
2389 | if (count) { | |
2390 | for (seg = 0; seg < nr_segs; seg++) { | |
2391 | read_descriptor_t desc; | |
2392 | ||
2393 | desc.written = 0; | |
2394 | desc.arg.buf = iov[seg].iov_base; | |
2395 | desc.count = iov[seg].iov_len; | |
2396 | if (desc.count == 0) | |
2397 | continue; | |
2398 | desc.error = 0; | |
2399 | do_generic_file_read(filp, ppos, &desc, | |
2400 | btrfs_read_actor); | |
2401 | retval += desc.written; | |
2402 | if (desc.error) { | |
2403 | retval = retval ?: desc.error; | |
2404 | break; | |
2405 | } | |
2406 | } | |
2407 | } | |
2408 | return retval; | |
2409 | } | |
2410 | ||
2619ba1f CM |
2411 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
2412 | { | |
2413 | struct btrfs_trans_handle *trans; | |
2414 | struct btrfs_key key; | |
2415 | struct btrfs_root_item root_item; | |
2416 | struct btrfs_inode_item *inode_item; | |
2417 | struct buffer_head *subvol; | |
2418 | struct btrfs_leaf *leaf; | |
2419 | struct btrfs_root *new_root; | |
2420 | struct inode *inode; | |
31f3c99b | 2421 | struct inode *dir; |
2619ba1f CM |
2422 | int ret; |
2423 | u64 objectid; | |
2424 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
2425 | ||
2426 | mutex_lock(&root->fs_info->fs_mutex); | |
2427 | trans = btrfs_start_transaction(root, 1); | |
2428 | BUG_ON(!trans); | |
2429 | ||
31f3c99b | 2430 | subvol = btrfs_alloc_free_block(trans, root, 0); |
5e82849e CM |
2431 | if (subvol == NULL) |
2432 | return -ENOSPC; | |
2619ba1f CM |
2433 | leaf = btrfs_buffer_leaf(subvol); |
2434 | btrfs_set_header_nritems(&leaf->header, 0); | |
2435 | btrfs_set_header_level(&leaf->header, 0); | |
7eccb903 | 2436 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
2619ba1f | 2437 | btrfs_set_header_generation(&leaf->header, trans->transid); |
4d775673 | 2438 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); |
2619ba1f CM |
2439 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, |
2440 | sizeof(leaf->header.fsid)); | |
4d775673 | 2441 | mark_buffer_dirty(subvol); |
2619ba1f CM |
2442 | |
2443 | inode_item = &root_item.inode; | |
2444 | memset(inode_item, 0, sizeof(*inode_item)); | |
2445 | btrfs_set_inode_generation(inode_item, 1); | |
2446 | btrfs_set_inode_size(inode_item, 3); | |
2447 | btrfs_set_inode_nlink(inode_item, 1); | |
2448 | btrfs_set_inode_nblocks(inode_item, 1); | |
2449 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
2450 | ||
7eccb903 | 2451 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
2619ba1f | 2452 | btrfs_set_root_refs(&root_item, 1); |
5e82849e CM |
2453 | brelse(subvol); |
2454 | subvol = NULL; | |
2619ba1f | 2455 | |
2619ba1f CM |
2456 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2457 | 0, &objectid); | |
2458 | BUG_ON(ret); | |
2459 | ||
2460 | btrfs_set_root_dirid(&root_item, new_dirid); | |
2461 | ||
2462 | key.objectid = objectid; | |
2463 | key.offset = 1; | |
2464 | key.flags = 0; | |
2465 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
2466 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2467 | &root_item); | |
2468 | BUG_ON(ret); | |
2469 | ||
2470 | /* | |
2471 | * insert the directory item | |
2472 | */ | |
2473 | key.offset = (u64)-1; | |
31f3c99b | 2474 | dir = root->fs_info->sb->s_root->d_inode; |
2619ba1f | 2475 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
fabb5681 CM |
2476 | name, namelen, dir->i_ino, &key, |
2477 | BTRFS_FT_DIR); | |
2619ba1f CM |
2478 | BUG_ON(ret); |
2479 | ||
2480 | ret = btrfs_commit_transaction(trans, root); | |
2481 | BUG_ON(ret); | |
2482 | ||
2483 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
2484 | BUG_ON(!new_root); | |
2485 | ||
2486 | trans = btrfs_start_transaction(new_root, 1); | |
2487 | BUG_ON(!trans); | |
2488 | ||
31f3c99b CM |
2489 | inode = btrfs_new_inode(trans, new_root, new_dirid, |
2490 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
2619ba1f CM |
2491 | inode->i_op = &btrfs_dir_inode_operations; |
2492 | inode->i_fop = &btrfs_dir_file_operations; | |
2493 | ||
2494 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
2495 | BUG_ON(ret); | |
2496 | ||
2497 | inode->i_nlink = 1; | |
2498 | inode->i_size = 6; | |
2499 | ret = btrfs_update_inode(trans, new_root, inode); | |
2500 | BUG_ON(ret); | |
2501 | ||
2502 | ret = btrfs_commit_transaction(trans, new_root); | |
2503 | BUG_ON(ret); | |
2504 | ||
2505 | iput(inode); | |
2506 | ||
2507 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2508 | btrfs_btree_balance_dirty(root); |
2619ba1f CM |
2509 | return 0; |
2510 | } | |
2511 | ||
c5739bba CM |
2512 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
2513 | { | |
2514 | struct btrfs_trans_handle *trans; | |
2515 | struct btrfs_key key; | |
2516 | struct btrfs_root_item new_root_item; | |
2517 | int ret; | |
2518 | u64 objectid; | |
2519 | ||
2619ba1f CM |
2520 | if (!root->ref_cows) |
2521 | return -EINVAL; | |
2522 | ||
c5739bba CM |
2523 | mutex_lock(&root->fs_info->fs_mutex); |
2524 | trans = btrfs_start_transaction(root, 1); | |
2525 | BUG_ON(!trans); | |
2526 | ||
2527 | ret = btrfs_update_inode(trans, root, root->inode); | |
2528 | BUG_ON(ret); | |
2529 | ||
1b05da2e CM |
2530 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2531 | 0, &objectid); | |
c5739bba CM |
2532 | BUG_ON(ret); |
2533 | ||
c5739bba CM |
2534 | memcpy(&new_root_item, &root->root_item, |
2535 | sizeof(new_root_item)); | |
2536 | ||
c5739bba CM |
2537 | key.objectid = objectid; |
2538 | key.offset = 1; | |
2539 | key.flags = 0; | |
2540 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
7eccb903 | 2541 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
c5739bba CM |
2542 | |
2543 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2544 | &new_root_item); | |
2545 | BUG_ON(ret); | |
2546 | ||
c5739bba CM |
2547 | /* |
2548 | * insert the directory item | |
2549 | */ | |
2550 | key.offset = (u64)-1; | |
2551 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2552 | name, namelen, | |
2553 | root->fs_info->sb->s_root->d_inode->i_ino, | |
fabb5681 | 2554 | &key, BTRFS_FT_DIR); |
c5739bba CM |
2555 | |
2556 | BUG_ON(ret); | |
2557 | ||
2558 | ret = btrfs_inc_root_ref(trans, root); | |
2559 | BUG_ON(ret); | |
2560 | ||
2561 | ret = btrfs_commit_transaction(trans, root); | |
2562 | BUG_ON(ret); | |
2563 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2564 | btrfs_btree_balance_dirty(root); |
c5739bba CM |
2565 | return 0; |
2566 | } | |
2567 | ||
8352d8a4 CM |
2568 | static int add_disk(struct btrfs_root *root, char *name, int namelen) |
2569 | { | |
2570 | struct block_device *bdev; | |
2571 | struct btrfs_path *path; | |
2572 | struct super_block *sb = root->fs_info->sb; | |
2573 | struct btrfs_root *dev_root = root->fs_info->dev_root; | |
2574 | struct btrfs_trans_handle *trans; | |
2575 | struct btrfs_device_item *dev_item; | |
2576 | struct btrfs_key key; | |
2577 | u16 item_size; | |
2578 | u64 num_blocks; | |
2579 | u64 new_blocks; | |
b4100d64 | 2580 | u64 device_id; |
8352d8a4 | 2581 | int ret; |
b4100d64 | 2582 | |
8352d8a4 CM |
2583 | printk("adding disk %s\n", name); |
2584 | path = btrfs_alloc_path(); | |
2585 | if (!path) | |
2586 | return -ENOMEM; | |
2587 | num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super); | |
2588 | bdev = open_bdev_excl(name, O_RDWR, sb); | |
2589 | if (IS_ERR(bdev)) { | |
2590 | ret = PTR_ERR(bdev); | |
2591 | printk("open bdev excl failed ret %d\n", ret); | |
2592 | goto out_nolock; | |
2593 | } | |
2594 | set_blocksize(bdev, sb->s_blocksize); | |
2595 | new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
2596 | key.objectid = num_blocks; | |
2597 | key.offset = new_blocks; | |
2598 | key.flags = 0; | |
2599 | btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY); | |
2600 | ||
2601 | mutex_lock(&dev_root->fs_info->fs_mutex); | |
2602 | trans = btrfs_start_transaction(dev_root, 1); | |
2603 | item_size = sizeof(*dev_item) + namelen; | |
2604 | printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size); | |
2605 | ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size); | |
2606 | if (ret) { | |
2607 | printk("insert failed %d\n", ret); | |
2608 | close_bdev_excl(bdev); | |
2609 | if (ret > 0) | |
2610 | ret = -EEXIST; | |
2611 | goto out; | |
2612 | } | |
2613 | dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2614 | path->slots[0], struct btrfs_device_item); | |
2615 | btrfs_set_device_pathlen(dev_item, namelen); | |
2616 | memcpy(dev_item + 1, name, namelen); | |
b4100d64 CM |
2617 | |
2618 | device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1; | |
2619 | btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id); | |
2620 | btrfs_set_device_id(dev_item, device_id); | |
8352d8a4 CM |
2621 | mark_buffer_dirty(path->nodes[0]); |
2622 | ||
b4100d64 CM |
2623 | ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks, |
2624 | new_blocks); | |
8352d8a4 CM |
2625 | |
2626 | if (!ret) { | |
2627 | btrfs_set_super_total_blocks(root->fs_info->disk_super, | |
2628 | num_blocks + new_blocks); | |
2629 | i_size_write(root->fs_info->btree_inode, | |
2630 | (num_blocks + new_blocks) << | |
2631 | root->fs_info->btree_inode->i_blkbits); | |
2632 | } | |
2633 | ||
2634 | out: | |
2635 | ret = btrfs_commit_transaction(trans, dev_root); | |
2636 | BUG_ON(ret); | |
2637 | mutex_unlock(&root->fs_info->fs_mutex); | |
2638 | out_nolock: | |
2639 | btrfs_free_path(path); | |
35b7e476 | 2640 | btrfs_btree_balance_dirty(root); |
8352d8a4 CM |
2641 | |
2642 | return ret; | |
2643 | } | |
2644 | ||
c5739bba CM |
2645 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
2646 | cmd, unsigned long arg) | |
2647 | { | |
2648 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2649 | struct btrfs_ioctl_vol_args vol_args; | |
8352d8a4 | 2650 | int ret = 0; |
7e38180e | 2651 | struct btrfs_dir_item *di; |
c5739bba | 2652 | int namelen; |
2619ba1f CM |
2653 | struct btrfs_path *path; |
2654 | u64 root_dirid; | |
c5739bba | 2655 | |
c5739bba CM |
2656 | switch (cmd) { |
2657 | case BTRFS_IOC_SNAP_CREATE: | |
2658 | if (copy_from_user(&vol_args, | |
2659 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2660 | sizeof(vol_args))) | |
2661 | return -EFAULT; | |
2662 | namelen = strlen(vol_args.name); | |
2663 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2664 | return -EINVAL; | |
2619ba1f CM |
2665 | path = btrfs_alloc_path(); |
2666 | if (!path) | |
2667 | return -ENOMEM; | |
2d13d8d0 | 2668 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
2619ba1f | 2669 | mutex_lock(&root->fs_info->fs_mutex); |
7e38180e | 2670 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
2619ba1f CM |
2671 | path, root_dirid, |
2672 | vol_args.name, namelen, 0); | |
2673 | mutex_unlock(&root->fs_info->fs_mutex); | |
2d13d8d0 | 2674 | btrfs_free_path(path); |
7e38180e | 2675 | if (di && !IS_ERR(di)) |
2619ba1f CM |
2676 | return -EEXIST; |
2677 | ||
2678 | if (root == root->fs_info->tree_root) | |
2679 | ret = create_subvol(root, vol_args.name, namelen); | |
2680 | else | |
2681 | ret = create_snapshot(root, vol_args.name, namelen); | |
c5739bba CM |
2682 | WARN_ON(ret); |
2683 | break; | |
8352d8a4 CM |
2684 | case BTRFS_IOC_ADD_DISK: |
2685 | if (copy_from_user(&vol_args, | |
2686 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2687 | sizeof(vol_args))) | |
2688 | return -EFAULT; | |
2689 | namelen = strlen(vol_args.name); | |
2690 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2691 | return -EINVAL; | |
2692 | vol_args.name[namelen] = '\0'; | |
2693 | ret = add_disk(root, vol_args.name, namelen); | |
2694 | break; | |
c5739bba CM |
2695 | default: |
2696 | return -ENOTTY; | |
2697 | } | |
8352d8a4 | 2698 | return ret; |
c5739bba CM |
2699 | } |
2700 | ||
2c90e5d6 CM |
2701 | static struct kmem_cache *btrfs_inode_cachep; |
2702 | struct kmem_cache *btrfs_trans_handle_cachep; | |
2703 | struct kmem_cache *btrfs_transaction_cachep; | |
2704 | struct kmem_cache *btrfs_bit_radix_cachep; | |
2705 | struct kmem_cache *btrfs_path_cachep; | |
2706 | ||
2707 | /* | |
2708 | * Called inside transaction, so use GFP_NOFS | |
2709 | */ | |
2710 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2711 | { | |
2712 | struct btrfs_inode *ei; | |
2713 | ||
2714 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2715 | if (!ei) | |
2716 | return NULL; | |
2c90e5d6 CM |
2717 | return &ei->vfs_inode; |
2718 | } | |
2719 | ||
2720 | static void btrfs_destroy_inode(struct inode *inode) | |
2721 | { | |
2c90e5d6 | 2722 | WARN_ON(!list_empty(&inode->i_dentry)); |
2c90e5d6 CM |
2723 | WARN_ON(inode->i_data.nrpages); |
2724 | ||
2c90e5d6 CM |
2725 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2726 | } | |
2727 | ||
2728 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2729 | unsigned long flags) | |
2730 | { | |
2731 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2732 | ||
f9f3c6b6 | 2733 | if ((flags & (SLAB_CTOR_CONSTRUCTOR)) == |
2c90e5d6 CM |
2734 | SLAB_CTOR_CONSTRUCTOR) { |
2735 | inode_init_once(&ei->vfs_inode); | |
2736 | } | |
2737 | } | |
2738 | ||
2739 | static int init_inodecache(void) | |
2740 | { | |
2741 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
2742 | sizeof(struct btrfs_inode), | |
2743 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2744 | SLAB_MEM_SPREAD), | |
2745 | init_once, NULL); | |
2746 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
2747 | sizeof(struct btrfs_trans_handle), | |
2748 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2749 | SLAB_MEM_SPREAD), | |
2750 | NULL, NULL); | |
2751 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
2752 | sizeof(struct btrfs_transaction), | |
2753 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2754 | SLAB_MEM_SPREAD), | |
2755 | NULL, NULL); | |
2756 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
2757 | sizeof(struct btrfs_transaction), | |
2758 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2759 | SLAB_MEM_SPREAD), | |
2760 | NULL, NULL); | |
2761 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
2762 | 256, | |
2763 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2764 | SLAB_MEM_SPREAD | | |
2765 | SLAB_DESTROY_BY_RCU), | |
2766 | NULL, NULL); | |
2767 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
2768 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
2769 | return -ENOMEM; | |
2770 | return 0; | |
2771 | } | |
2772 | ||
2773 | static void destroy_inodecache(void) | |
2774 | { | |
2775 | kmem_cache_destroy(btrfs_inode_cachep); | |
2776 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2777 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2778 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2779 | kmem_cache_destroy(btrfs_path_cachep); | |
2780 | } | |
2781 | ||
2e635a27 CM |
2782 | static int btrfs_get_sb(struct file_system_type *fs_type, |
2783 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
2784 | { | |
2785 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
2786 | btrfs_fill_super, mnt); | |
2787 | } | |
2788 | ||
236454df CM |
2789 | static int btrfs_getattr(struct vfsmount *mnt, |
2790 | struct dentry *dentry, struct kstat *stat) | |
2791 | { | |
2792 | struct inode *inode = dentry->d_inode; | |
2793 | generic_fillattr(inode, stat); | |
2794 | stat->blksize = 256 * 1024; | |
2795 | return 0; | |
2796 | } | |
2797 | ||
8fd17795 CM |
2798 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2799 | { | |
2800 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
2801 | struct btrfs_super_block *disk_super = root->fs_info->disk_super; | |
2802 | ||
2803 | buf->f_namelen = BTRFS_NAME_LEN; | |
2804 | buf->f_blocks = btrfs_super_total_blocks(disk_super); | |
2805 | buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super); | |
2806 | buf->f_bavail = buf->f_bfree; | |
2807 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2808 | buf->f_type = BTRFS_SUPER_MAGIC; | |
2809 | return 0; | |
2810 | } | |
b5133862 | 2811 | |
e06afa83 CM |
2812 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, |
2813 | struct inode * new_dir,struct dentry *new_dentry) | |
2814 | { | |
2815 | struct btrfs_trans_handle *trans; | |
2816 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2817 | struct inode *new_inode = new_dentry->d_inode; | |
2818 | struct inode *old_inode = old_dentry->d_inode; | |
2819 | struct timespec ctime = CURRENT_TIME; | |
2820 | struct btrfs_path *path; | |
2821 | struct btrfs_dir_item *di; | |
2822 | int ret; | |
2823 | ||
2824 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2825 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2826 | return -ENOTEMPTY; | |
2827 | } | |
2828 | mutex_lock(&root->fs_info->fs_mutex); | |
2829 | trans = btrfs_start_transaction(root, 1); | |
2830 | btrfs_set_trans_block_group(trans, new_dir); | |
2831 | path = btrfs_alloc_path(); | |
2832 | if (!path) { | |
2833 | ret = -ENOMEM; | |
2834 | goto out_fail; | |
2835 | } | |
2836 | ||
2837 | old_dentry->d_inode->i_nlink++; | |
2838 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2839 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2840 | old_inode->i_ctime = ctime; | |
2841 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { | |
2842 | struct btrfs_key *location = &BTRFS_I(new_dir)->location; | |
2843 | u64 old_parent_oid; | |
2844 | di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino, | |
2845 | "..", 2, -1); | |
2846 | if (IS_ERR(di)) { | |
2847 | ret = PTR_ERR(di); | |
2848 | goto out_fail; | |
2849 | } | |
2850 | if (!di) { | |
2851 | ret = -ENOENT; | |
2852 | goto out_fail; | |
2853 | } | |
2854 | old_parent_oid = btrfs_disk_key_objectid(&di->location); | |
2855 | ret = btrfs_del_item(trans, root, path); | |
2856 | if (ret) { | |
2857 | ret = -EIO; | |
2858 | goto out_fail; | |
2859 | } | |
2860 | btrfs_release_path(root, path); | |
2861 | ||
2862 | di = btrfs_lookup_dir_index_item(trans, root, path, | |
2863 | old_inode->i_ino, | |
2864 | old_parent_oid, | |
2865 | "..", 2, -1); | |
2866 | if (IS_ERR(di)) { | |
2867 | ret = PTR_ERR(di); | |
2868 | goto out_fail; | |
2869 | } | |
2870 | if (!di) { | |
2871 | ret = -ENOENT; | |
2872 | goto out_fail; | |
2873 | } | |
2874 | ret = btrfs_del_item(trans, root, path); | |
2875 | if (ret) { | |
2876 | ret = -EIO; | |
2877 | goto out_fail; | |
2878 | } | |
2879 | btrfs_release_path(root, path); | |
2880 | ||
2881 | ret = btrfs_insert_dir_item(trans, root, "..", 2, | |
fabb5681 CM |
2882 | old_inode->i_ino, location, |
2883 | BTRFS_FT_DIR); | |
e06afa83 CM |
2884 | if (ret) |
2885 | goto out_fail; | |
2886 | } | |
2887 | ||
2888 | ||
e06afa83 CM |
2889 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2890 | if (ret) | |
2891 | goto out_fail; | |
2892 | ||
2893 | if (new_inode) { | |
2894 | new_inode->i_ctime = CURRENT_TIME; | |
2b8d99a7 CM |
2895 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); |
2896 | if (ret) | |
2897 | goto out_fail; | |
e06afa83 CM |
2898 | if (S_ISDIR(new_inode->i_mode)) |
2899 | clear_nlink(new_inode); | |
2900 | else | |
2901 | drop_nlink(new_inode); | |
2902 | btrfs_update_inode(trans, root, new_inode); | |
2903 | } | |
2b8d99a7 CM |
2904 | ret = btrfs_add_link(trans, new_dentry, old_inode); |
2905 | if (ret) | |
2906 | goto out_fail; | |
2907 | ||
e06afa83 CM |
2908 | out_fail: |
2909 | btrfs_free_path(path); | |
2910 | btrfs_end_transaction(trans, root); | |
2911 | mutex_unlock(&root->fs_info->fs_mutex); | |
2912 | return ret; | |
2913 | } | |
2914 | ||
2b8d99a7 CM |
2915 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
2916 | const char *symname) | |
2917 | { | |
2918 | struct btrfs_trans_handle *trans; | |
2919 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2920 | struct btrfs_path *path; | |
2921 | struct btrfs_key key; | |
2922 | struct inode *inode; | |
2923 | int err; | |
2924 | int drop_inode = 0; | |
2925 | u64 objectid; | |
2926 | int name_len; | |
2927 | int datasize; | |
2928 | char *ptr; | |
2929 | struct btrfs_file_extent_item *ei; | |
2930 | ||
2931 | name_len = strlen(symname) + 1; | |
2932 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2933 | return -ENAMETOOLONG; | |
2934 | mutex_lock(&root->fs_info->fs_mutex); | |
2935 | trans = btrfs_start_transaction(root, 1); | |
2936 | btrfs_set_trans_block_group(trans, dir); | |
2937 | ||
2938 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2939 | if (err) { | |
2940 | err = -ENOSPC; | |
2941 | goto out_unlock; | |
2942 | } | |
2943 | ||
2944 | inode = btrfs_new_inode(trans, root, objectid, | |
2945 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2946 | err = PTR_ERR(inode); | |
2947 | if (IS_ERR(inode)) | |
2948 | goto out_unlock; | |
2949 | ||
2950 | btrfs_set_trans_block_group(trans, inode); | |
2951 | err = btrfs_add_nondir(trans, dentry, inode); | |
2952 | if (err) | |
2953 | drop_inode = 1; | |
2954 | else { | |
2955 | inode->i_mapping->a_ops = &btrfs_aops; | |
2956 | inode->i_fop = &btrfs_file_operations; | |
2957 | inode->i_op = &btrfs_file_inode_operations; | |
2958 | } | |
2959 | dir->i_sb->s_dirt = 1; | |
2960 | btrfs_update_inode_block_group(trans, inode); | |
2961 | btrfs_update_inode_block_group(trans, dir); | |
2962 | if (drop_inode) | |
2963 | goto out_unlock; | |
2964 | ||
2965 | path = btrfs_alloc_path(); | |
2966 | BUG_ON(!path); | |
2967 | key.objectid = inode->i_ino; | |
2968 | key.offset = 0; | |
2969 | key.flags = 0; | |
2970 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
2971 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2972 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2973 | datasize); | |
2974 | BUG_ON(err); | |
2975 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2976 | path->slots[0], struct btrfs_file_extent_item); | |
2977 | btrfs_set_file_extent_generation(ei, trans->transid); | |
2978 | btrfs_set_file_extent_type(ei, | |
2979 | BTRFS_FILE_EXTENT_INLINE); | |
2980 | ptr = btrfs_file_extent_inline_start(ei); | |
2981 | btrfs_memcpy(root, path->nodes[0]->b_data, | |
2982 | ptr, symname, name_len); | |
2983 | mark_buffer_dirty(path->nodes[0]); | |
2984 | btrfs_free_path(path); | |
2985 | inode->i_op = &btrfs_symlink_inode_operations; | |
2986 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2987 | inode->i_size = name_len - 1; | |
2988 | btrfs_update_inode(trans, root, inode); | |
2989 | err = 0; | |
2990 | ||
2991 | out_unlock: | |
2992 | btrfs_end_transaction(trans, root); | |
2993 | mutex_unlock(&root->fs_info->fs_mutex); | |
2994 | ||
2995 | if (drop_inode) { | |
2996 | inode_dec_link_count(inode); | |
2997 | iput(inode); | |
2998 | } | |
2999 | btrfs_btree_balance_dirty(root); | |
3000 | return err; | |
3001 | } | |
3002 | ||
2e635a27 CM |
3003 | static struct file_system_type btrfs_fs_type = { |
3004 | .owner = THIS_MODULE, | |
3005 | .name = "btrfs", | |
3006 | .get_sb = btrfs_get_sb, | |
3007 | .kill_sb = kill_block_super, | |
3008 | .fs_flags = FS_REQUIRES_DEV, | |
3009 | }; | |
3010 | ||
e20d96d6 | 3011 | static struct super_operations btrfs_super_ops = { |
134e9731 | 3012 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
3013 | .put_super = btrfs_put_super, |
3014 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
3015 | .write_super = btrfs_write_super, |
3016 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 3017 | .write_inode = btrfs_write_inode, |
b5133862 | 3018 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
3019 | .alloc_inode = btrfs_alloc_inode, |
3020 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 3021 | .statfs = btrfs_statfs, |
e20d96d6 CM |
3022 | }; |
3023 | ||
3024 | static struct inode_operations btrfs_dir_inode_operations = { | |
3025 | .lookup = btrfs_lookup, | |
d5719762 | 3026 | .create = btrfs_create, |
134e9731 | 3027 | .unlink = btrfs_unlink, |
2b8d99a7 | 3028 | .link = btrfs_link, |
f7922033 | 3029 | .mkdir = btrfs_mkdir, |
5f443fd2 | 3030 | .rmdir = btrfs_rmdir, |
e06afa83 | 3031 | .rename = btrfs_rename, |
2b8d99a7 | 3032 | .symlink = btrfs_symlink, |
3a686375 | 3033 | .setattr = btrfs_setattr, |
e20d96d6 CM |
3034 | }; |
3035 | ||
d6e4a428 CM |
3036 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
3037 | .lookup = btrfs_lookup, | |
3038 | }; | |
3039 | ||
e20d96d6 CM |
3040 | static struct file_operations btrfs_dir_file_operations = { |
3041 | .llseek = generic_file_llseek, | |
3042 | .read = generic_read_dir, | |
3043 | .readdir = btrfs_readdir, | |
c5739bba | 3044 | .ioctl = btrfs_ioctl, |
e20d96d6 CM |
3045 | }; |
3046 | ||
dee26a9f CM |
3047 | static struct address_space_operations btrfs_aops = { |
3048 | .readpage = btrfs_readpage, | |
dee26a9f CM |
3049 | .writepage = btrfs_writepage, |
3050 | .sync_page = block_sync_page, | |
3051 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 3052 | .commit_write = btrfs_commit_write, |
fabb5681 | 3053 | .bmap = btrfs_bmap, |
dee26a9f CM |
3054 | }; |
3055 | ||
2b8d99a7 CM |
3056 | static struct address_space_operations btrfs_symlink_aops = { |
3057 | .readpage = btrfs_readpage, | |
3058 | .writepage = btrfs_writepage, | |
3059 | }; | |
3060 | ||
dee26a9f | 3061 | static struct inode_operations btrfs_file_inode_operations = { |
f4b9aa8d | 3062 | .truncate = btrfs_truncate, |
236454df | 3063 | .getattr = btrfs_getattr, |
3a686375 | 3064 | .setattr = btrfs_setattr, |
dee26a9f CM |
3065 | }; |
3066 | ||
3067 | static struct file_operations btrfs_file_operations = { | |
3068 | .llseek = generic_file_llseek, | |
3069 | .read = do_sync_read, | |
e8f05c45 CM |
3070 | .aio_read = btrfs_file_aio_read, |
3071 | .write = btrfs_file_write, | |
dee26a9f CM |
3072 | .mmap = generic_file_mmap, |
3073 | .open = generic_file_open, | |
c5739bba | 3074 | .ioctl = btrfs_ioctl, |
8fd17795 | 3075 | .fsync = btrfs_sync_file, |
dee26a9f | 3076 | }; |
e20d96d6 | 3077 | |
2b8d99a7 CM |
3078 | static struct inode_operations btrfs_symlink_inode_operations = { |
3079 | .readlink = generic_readlink, | |
3080 | .follow_link = page_follow_link_light, | |
3081 | .put_link = page_put_link, | |
3082 | }; | |
3083 | ||
2e635a27 CM |
3084 | static int __init init_btrfs_fs(void) |
3085 | { | |
2c90e5d6 | 3086 | int err; |
2e635a27 | 3087 | printk("btrfs loaded!\n"); |
2c90e5d6 CM |
3088 | err = init_inodecache(); |
3089 | if (err) | |
3090 | return err; | |
2e635a27 | 3091 | return register_filesystem(&btrfs_fs_type); |
d6e4a428 CM |
3092 | destroy_inodecache(); |
3093 | return err; | |
2e635a27 CM |
3094 | } |
3095 | ||
3096 | static void __exit exit_btrfs_fs(void) | |
3097 | { | |
2c90e5d6 | 3098 | destroy_inodecache(); |
2e635a27 CM |
3099 | unregister_filesystem(&btrfs_fs_type); |
3100 | printk("btrfs unloaded\n"); | |
3101 | } | |
3102 | ||
3103 | module_init(init_btrfs_fs) | |
3104 | module_exit(exit_btrfs_fs) | |
3105 | ||
3106 | MODULE_LICENSE("GPL"); |