Commit | Line | Data |
---|---|---|
6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
39279cc3 CM |
19 | #include <linux/buffer_head.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/backing-dev.h> | |
28 | #include <linux/mpage.h> | |
29 | #include <linux/swap.h> | |
30 | #include <linux/writeback.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/compat.h> | |
9ebefb18 | 33 | #include <linux/bit_spinlock.h> |
92fee66d | 34 | #include <linux/version.h> |
39279cc3 CM |
35 | #include "ctree.h" |
36 | #include "disk-io.h" | |
37 | #include "transaction.h" | |
38 | #include "btrfs_inode.h" | |
39 | #include "ioctl.h" | |
40 | #include "print-tree.h" | |
41 | ||
42 | struct btrfs_iget_args { | |
43 | u64 ino; | |
44 | struct btrfs_root *root; | |
45 | }; | |
46 | ||
47 | static struct inode_operations btrfs_dir_inode_operations; | |
48 | static struct inode_operations btrfs_symlink_inode_operations; | |
49 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 50 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
51 | static struct inode_operations btrfs_file_inode_operations; |
52 | static struct address_space_operations btrfs_aops; | |
53 | static struct address_space_operations btrfs_symlink_aops; | |
54 | static struct file_operations btrfs_dir_file_operations; | |
55 | ||
56 | static struct kmem_cache *btrfs_inode_cachep; | |
57 | struct kmem_cache *btrfs_trans_handle_cachep; | |
58 | struct kmem_cache *btrfs_transaction_cachep; | |
59 | struct kmem_cache *btrfs_bit_radix_cachep; | |
60 | struct kmem_cache *btrfs_path_cachep; | |
61 | ||
62 | #define S_SHIFT 12 | |
63 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
64 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
65 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
66 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
67 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
68 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
69 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
70 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
71 | }; | |
72 | ||
b888db2b CM |
73 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) |
74 | { | |
75 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
76 | struct btrfs_trans_handle *trans; | |
77 | struct btrfs_key ins; | |
78 | u64 alloc_hint = 0; | |
79 | u64 num_blocks; | |
80 | int ret; | |
81 | u64 blocksize = 1 << inode->i_blkbits; | |
82 | ||
83 | mutex_lock(&root->fs_info->fs_mutex); | |
84 | trans = btrfs_start_transaction(root, 1); | |
85 | btrfs_set_trans_block_group(trans, inode); | |
86 | BUG_ON(!trans); | |
87 | num_blocks = (end - start + blocksize) & ~(blocksize - 1); | |
88 | ret = btrfs_drop_extents(trans, root, inode, | |
89 | start, start + num_blocks, &alloc_hint); | |
90 | num_blocks = num_blocks >> inode->i_blkbits; | |
91 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_blocks, 0, | |
92 | alloc_hint, (u64)-1, &ins, 1); | |
93 | if (ret) { | |
94 | WARN_ON(1); | |
95 | goto out; | |
96 | } | |
97 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
98 | start, ins.objectid, ins.offset, | |
99 | ins.offset); | |
100 | out: | |
101 | btrfs_end_transaction(trans, root); | |
102 | mutex_unlock(&root->fs_info->fs_mutex); | |
103 | return ret; | |
104 | } | |
105 | ||
106 | ||
39279cc3 CM |
107 | void btrfs_read_locked_inode(struct inode *inode) |
108 | { | |
109 | struct btrfs_path *path; | |
110 | struct btrfs_inode_item *inode_item; | |
111 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
112 | struct btrfs_key location; | |
113 | u64 alloc_group_block; | |
618e21d5 | 114 | u32 rdev; |
39279cc3 CM |
115 | int ret; |
116 | ||
117 | path = btrfs_alloc_path(); | |
118 | BUG_ON(!path); | |
39279cc3 CM |
119 | mutex_lock(&root->fs_info->fs_mutex); |
120 | ||
121 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); | |
122 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
123 | if (ret) { | |
124 | btrfs_free_path(path); | |
125 | goto make_bad; | |
126 | } | |
127 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
128 | path->slots[0], | |
129 | struct btrfs_inode_item); | |
130 | ||
131 | inode->i_mode = btrfs_inode_mode(inode_item); | |
132 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
133 | inode->i_uid = btrfs_inode_uid(inode_item); | |
134 | inode->i_gid = btrfs_inode_gid(inode_item); | |
135 | inode->i_size = btrfs_inode_size(inode_item); | |
136 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
137 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
138 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
139 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
140 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
141 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
142 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
143 | inode->i_generation = btrfs_inode_generation(inode_item); | |
618e21d5 JB |
144 | inode->i_rdev = 0; |
145 | rdev = btrfs_inode_rdev(inode_item); | |
39279cc3 CM |
146 | alloc_group_block = btrfs_inode_block_group(inode_item); |
147 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, | |
148 | alloc_group_block); | |
149 | ||
150 | btrfs_free_path(path); | |
151 | inode_item = NULL; | |
152 | ||
153 | mutex_unlock(&root->fs_info->fs_mutex); | |
154 | ||
155 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
156 | case S_IFREG: |
157 | inode->i_mapping->a_ops = &btrfs_aops; | |
b888db2b | 158 | BTRFS_I(inode)->extent_tree.fill_delalloc = run_delalloc_range; |
39279cc3 CM |
159 | inode->i_fop = &btrfs_file_operations; |
160 | inode->i_op = &btrfs_file_inode_operations; | |
161 | break; | |
162 | case S_IFDIR: | |
163 | inode->i_fop = &btrfs_dir_file_operations; | |
164 | if (root == root->fs_info->tree_root) | |
165 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
166 | else | |
167 | inode->i_op = &btrfs_dir_inode_operations; | |
168 | break; | |
169 | case S_IFLNK: | |
170 | inode->i_op = &btrfs_symlink_inode_operations; | |
171 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
172 | break; | |
618e21d5 JB |
173 | default: |
174 | init_special_inode(inode, inode->i_mode, rdev); | |
175 | break; | |
39279cc3 CM |
176 | } |
177 | return; | |
178 | ||
179 | make_bad: | |
180 | btrfs_release_path(root, path); | |
181 | btrfs_free_path(path); | |
182 | mutex_unlock(&root->fs_info->fs_mutex); | |
183 | make_bad_inode(inode); | |
184 | } | |
185 | ||
186 | static void fill_inode_item(struct btrfs_inode_item *item, | |
187 | struct inode *inode) | |
188 | { | |
189 | btrfs_set_inode_uid(item, inode->i_uid); | |
190 | btrfs_set_inode_gid(item, inode->i_gid); | |
191 | btrfs_set_inode_size(item, inode->i_size); | |
192 | btrfs_set_inode_mode(item, inode->i_mode); | |
193 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
194 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
195 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
196 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
197 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
198 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
199 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
200 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
201 | btrfs_set_inode_generation(item, inode->i_generation); | |
618e21d5 | 202 | btrfs_set_inode_rdev(item, inode->i_rdev); |
39279cc3 CM |
203 | btrfs_set_inode_block_group(item, |
204 | BTRFS_I(inode)->block_group->key.objectid); | |
205 | } | |
206 | ||
a52d9a80 | 207 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
208 | struct btrfs_root *root, |
209 | struct inode *inode) | |
210 | { | |
211 | struct btrfs_inode_item *inode_item; | |
212 | struct btrfs_path *path; | |
213 | int ret; | |
214 | ||
215 | path = btrfs_alloc_path(); | |
216 | BUG_ON(!path); | |
39279cc3 CM |
217 | ret = btrfs_lookup_inode(trans, root, path, |
218 | &BTRFS_I(inode)->location, 1); | |
219 | if (ret) { | |
220 | if (ret > 0) | |
221 | ret = -ENOENT; | |
222 | goto failed; | |
223 | } | |
224 | ||
225 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
226 | path->slots[0], | |
227 | struct btrfs_inode_item); | |
228 | ||
229 | fill_inode_item(inode_item, inode); | |
230 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
15ee9bc7 | 231 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
232 | ret = 0; |
233 | failed: | |
234 | btrfs_release_path(root, path); | |
235 | btrfs_free_path(path); | |
236 | return ret; | |
237 | } | |
238 | ||
239 | ||
240 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
241 | struct btrfs_root *root, | |
242 | struct inode *dir, | |
243 | struct dentry *dentry) | |
244 | { | |
245 | struct btrfs_path *path; | |
246 | const char *name = dentry->d_name.name; | |
247 | int name_len = dentry->d_name.len; | |
248 | int ret = 0; | |
249 | u64 objectid; | |
250 | struct btrfs_dir_item *di; | |
251 | ||
252 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
253 | if (!path) { |
254 | ret = -ENOMEM; | |
255 | goto err; | |
256 | } | |
257 | ||
39279cc3 CM |
258 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
259 | name, name_len, -1); | |
260 | if (IS_ERR(di)) { | |
261 | ret = PTR_ERR(di); | |
262 | goto err; | |
263 | } | |
264 | if (!di) { | |
265 | ret = -ENOENT; | |
266 | goto err; | |
267 | } | |
268 | objectid = btrfs_disk_key_objectid(&di->location); | |
269 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
54aa1f4d CM |
270 | if (ret) |
271 | goto err; | |
39279cc3 CM |
272 | btrfs_release_path(root, path); |
273 | ||
274 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
275 | objectid, name, name_len, -1); | |
276 | if (IS_ERR(di)) { | |
277 | ret = PTR_ERR(di); | |
278 | goto err; | |
279 | } | |
280 | if (!di) { | |
281 | ret = -ENOENT; | |
282 | goto err; | |
283 | } | |
284 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
285 | |
286 | dentry->d_inode->i_ctime = dir->i_ctime; | |
287 | err: | |
288 | btrfs_free_path(path); | |
289 | if (!ret) { | |
290 | dir->i_size -= name_len * 2; | |
79c44584 | 291 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 CM |
292 | btrfs_update_inode(trans, root, dir); |
293 | drop_nlink(dentry->d_inode); | |
54aa1f4d | 294 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
295 | dir->i_sb->s_dirt = 1; |
296 | } | |
297 | return ret; | |
298 | } | |
299 | ||
300 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
301 | { | |
302 | struct btrfs_root *root; | |
303 | struct btrfs_trans_handle *trans; | |
304 | int ret; | |
305 | ||
306 | root = BTRFS_I(dir)->root; | |
307 | mutex_lock(&root->fs_info->fs_mutex); | |
308 | trans = btrfs_start_transaction(root, 1); | |
309 | btrfs_set_trans_block_group(trans, dir); | |
310 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
311 | btrfs_end_transaction(trans, root); | |
312 | mutex_unlock(&root->fs_info->fs_mutex); | |
313 | btrfs_btree_balance_dirty(root); | |
314 | return ret; | |
315 | } | |
316 | ||
317 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
318 | { | |
319 | struct inode *inode = dentry->d_inode; | |
320 | int err; | |
321 | int ret; | |
322 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
323 | struct btrfs_path *path; | |
324 | struct btrfs_key key; | |
325 | struct btrfs_trans_handle *trans; | |
326 | struct btrfs_key found_key; | |
327 | int found_type; | |
328 | struct btrfs_leaf *leaf; | |
329 | char *goodnames = ".."; | |
330 | ||
331 | path = btrfs_alloc_path(); | |
332 | BUG_ON(!path); | |
39279cc3 CM |
333 | mutex_lock(&root->fs_info->fs_mutex); |
334 | trans = btrfs_start_transaction(root, 1); | |
335 | btrfs_set_trans_block_group(trans, dir); | |
336 | key.objectid = inode->i_ino; | |
337 | key.offset = (u64)-1; | |
338 | key.flags = (u32)-1; | |
339 | while(1) { | |
340 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
341 | if (ret < 0) { | |
342 | err = ret; | |
343 | goto out; | |
344 | } | |
345 | BUG_ON(ret == 0); | |
346 | if (path->slots[0] == 0) { | |
347 | err = -ENOENT; | |
348 | goto out; | |
349 | } | |
350 | path->slots[0]--; | |
351 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
352 | btrfs_disk_key_to_cpu(&found_key, | |
353 | &leaf->items[path->slots[0]].key); | |
354 | found_type = btrfs_key_type(&found_key); | |
355 | if (found_key.objectid != inode->i_ino) { | |
356 | err = -ENOENT; | |
357 | goto out; | |
358 | } | |
359 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
360 | found_type != BTRFS_DIR_INDEX_KEY) || | |
361 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
362 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
363 | err = -ENOTEMPTY; | |
364 | goto out; | |
365 | } | |
366 | ret = btrfs_del_item(trans, root, path); | |
367 | BUG_ON(ret); | |
368 | ||
369 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) | |
370 | break; | |
371 | btrfs_release_path(root, path); | |
372 | } | |
373 | ret = 0; | |
374 | btrfs_release_path(root, path); | |
375 | ||
376 | /* now the directory is empty */ | |
377 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
378 | if (!err) { | |
379 | inode->i_size = 0; | |
380 | } | |
381 | out: | |
382 | btrfs_release_path(root, path); | |
383 | btrfs_free_path(path); | |
384 | mutex_unlock(&root->fs_info->fs_mutex); | |
385 | ret = btrfs_end_transaction(trans, root); | |
386 | btrfs_btree_balance_dirty(root); | |
387 | if (ret && !err) | |
388 | err = ret; | |
389 | return err; | |
390 | } | |
391 | ||
392 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
393 | struct btrfs_root *root, | |
394 | struct inode *inode) | |
395 | { | |
396 | struct btrfs_path *path; | |
397 | int ret; | |
398 | ||
399 | clear_inode(inode); | |
400 | ||
401 | path = btrfs_alloc_path(); | |
402 | BUG_ON(!path); | |
39279cc3 CM |
403 | ret = btrfs_lookup_inode(trans, root, path, |
404 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
405 | if (ret > 0) |
406 | ret = -ENOENT; | |
407 | if (!ret) | |
408 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
409 | btrfs_free_path(path); |
410 | return ret; | |
411 | } | |
412 | ||
39279cc3 CM |
413 | /* |
414 | * this can truncate away extent items, csum items and directory items. | |
415 | * It starts at a high offset and removes keys until it can't find | |
416 | * any higher than i_size. | |
417 | * | |
418 | * csum items that cross the new i_size are truncated to the new size | |
419 | * as well. | |
420 | */ | |
421 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
422 | struct btrfs_root *root, | |
423 | struct inode *inode) | |
424 | { | |
425 | int ret; | |
426 | struct btrfs_path *path; | |
427 | struct btrfs_key key; | |
428 | struct btrfs_disk_key *found_key; | |
429 | u32 found_type; | |
430 | struct btrfs_leaf *leaf; | |
431 | struct btrfs_file_extent_item *fi; | |
432 | u64 extent_start = 0; | |
433 | u64 extent_num_blocks = 0; | |
434 | u64 item_end = 0; | |
435 | int found_extent; | |
436 | int del_item; | |
437 | ||
a52d9a80 | 438 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 439 | path = btrfs_alloc_path(); |
3c69faec | 440 | path->reada = -1; |
39279cc3 CM |
441 | BUG_ON(!path); |
442 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
443 | key.objectid = inode->i_ino; | |
444 | key.offset = (u64)-1; | |
445 | key.flags = (u32)-1; | |
446 | while(1) { | |
447 | btrfs_init_path(path); | |
448 | fi = NULL; | |
449 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
450 | if (ret < 0) { | |
451 | goto error; | |
452 | } | |
453 | if (ret > 0) { | |
454 | BUG_ON(path->slots[0] == 0); | |
455 | path->slots[0]--; | |
456 | } | |
39279cc3 CM |
457 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
458 | found_key = &leaf->items[path->slots[0]].key; | |
459 | found_type = btrfs_disk_key_type(found_key); | |
460 | ||
461 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) | |
462 | break; | |
463 | if (found_type != BTRFS_CSUM_ITEM_KEY && | |
464 | found_type != BTRFS_DIR_ITEM_KEY && | |
465 | found_type != BTRFS_DIR_INDEX_KEY && | |
466 | found_type != BTRFS_EXTENT_DATA_KEY) | |
467 | break; | |
468 | ||
469 | item_end = btrfs_disk_key_offset(found_key); | |
470 | if (found_type == BTRFS_EXTENT_DATA_KEY) { | |
471 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
472 | path->slots[0], | |
473 | struct btrfs_file_extent_item); | |
474 | if (btrfs_file_extent_type(fi) != | |
475 | BTRFS_FILE_EXTENT_INLINE) { | |
476 | item_end += btrfs_file_extent_num_blocks(fi) << | |
477 | inode->i_blkbits; | |
478 | } | |
479 | } | |
480 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
481 | ret = btrfs_csum_truncate(trans, root, path, | |
482 | inode->i_size); | |
483 | BUG_ON(ret); | |
484 | } | |
485 | if (item_end < inode->i_size) { | |
b888db2b CM |
486 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
487 | found_type = BTRFS_INODE_ITEM_KEY; | |
488 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
489 | found_type = BTRFS_CSUM_ITEM_KEY; | |
490 | } else if (found_type) { | |
491 | found_type--; | |
492 | } else { | |
493 | break; | |
39279cc3 | 494 | } |
b888db2b CM |
495 | btrfs_set_key_type(&key, found_type - 1); |
496 | continue; | |
39279cc3 CM |
497 | } |
498 | if (btrfs_disk_key_offset(found_key) >= inode->i_size) | |
499 | del_item = 1; | |
500 | else | |
501 | del_item = 0; | |
502 | found_extent = 0; | |
503 | ||
504 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
505 | if (found_type == BTRFS_EXTENT_DATA_KEY && | |
506 | btrfs_file_extent_type(fi) != | |
507 | BTRFS_FILE_EXTENT_INLINE) { | |
508 | u64 num_dec; | |
509 | if (!del_item) { | |
510 | u64 orig_num_blocks = | |
511 | btrfs_file_extent_num_blocks(fi); | |
512 | extent_num_blocks = inode->i_size - | |
513 | btrfs_disk_key_offset(found_key) + | |
514 | root->blocksize - 1; | |
515 | extent_num_blocks >>= inode->i_blkbits; | |
516 | btrfs_set_file_extent_num_blocks(fi, | |
517 | extent_num_blocks); | |
518 | inode->i_blocks -= (orig_num_blocks - | |
519 | extent_num_blocks) << 3; | |
ccd467d6 | 520 | btrfs_mark_buffer_dirty(path->nodes[0]); |
39279cc3 CM |
521 | } else { |
522 | extent_start = | |
523 | btrfs_file_extent_disk_blocknr(fi); | |
524 | extent_num_blocks = | |
525 | btrfs_file_extent_disk_num_blocks(fi); | |
526 | /* FIXME blocksize != 4096 */ | |
527 | num_dec = btrfs_file_extent_num_blocks(fi) << 3; | |
528 | if (extent_start != 0) { | |
529 | found_extent = 1; | |
530 | inode->i_blocks -= num_dec; | |
531 | } | |
532 | } | |
533 | } | |
534 | if (del_item) { | |
535 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
536 | if (ret) |
537 | goto error; | |
39279cc3 CM |
538 | } else { |
539 | break; | |
540 | } | |
541 | btrfs_release_path(root, path); | |
542 | if (found_extent) { | |
543 | ret = btrfs_free_extent(trans, root, extent_start, | |
544 | extent_num_blocks, 0); | |
545 | BUG_ON(ret); | |
546 | } | |
547 | } | |
548 | ret = 0; | |
549 | error: | |
550 | btrfs_release_path(root, path); | |
551 | btrfs_free_path(path); | |
552 | inode->i_sb->s_dirt = 1; | |
553 | return ret; | |
554 | } | |
555 | ||
b888db2b | 556 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
557 | size_t zero_start) |
558 | { | |
559 | char *kaddr; | |
560 | int ret = 0; | |
b888db2b | 561 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
a52d9a80 | 562 | u64 page_start = page->index << PAGE_CACHE_SHIFT; |
b888db2b | 563 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
a52d9a80 CM |
564 | |
565 | if (!PagePrivate(page)) { | |
566 | SetPagePrivate(page); | |
567 | set_page_private(page, 1); | |
b888db2b | 568 | WARN_ON(!page->mapping->a_ops->invalidatepage); |
a52d9a80 CM |
569 | page_cache_get(page); |
570 | } | |
571 | ||
b888db2b CM |
572 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
573 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, | |
574 | page_end, GFP_NOFS); | |
a52d9a80 | 575 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 576 | kaddr = kmap(page); |
a52d9a80 CM |
577 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
578 | flush_dcache_page(page); | |
b888db2b | 579 | kunmap(page); |
a52d9a80 | 580 | } |
b888db2b CM |
581 | set_page_dirty(page); |
582 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 583 | |
a52d9a80 CM |
584 | return ret; |
585 | } | |
586 | ||
39279cc3 CM |
587 | /* |
588 | * taken from block_truncate_page, but does cow as it zeros out | |
589 | * any bytes left in the last page in the file. | |
590 | */ | |
591 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
592 | { | |
593 | struct inode *inode = mapping->host; | |
594 | unsigned blocksize = 1 << inode->i_blkbits; | |
595 | pgoff_t index = from >> PAGE_CACHE_SHIFT; | |
596 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
597 | struct page *page; | |
39279cc3 | 598 | int ret = 0; |
a52d9a80 | 599 | u64 page_start; |
39279cc3 CM |
600 | |
601 | if ((offset & (blocksize - 1)) == 0) | |
602 | goto out; | |
603 | ||
604 | ret = -ENOMEM; | |
605 | page = grab_cache_page(mapping, index); | |
606 | if (!page) | |
607 | goto out; | |
39279cc3 | 608 | if (!PageUptodate(page)) { |
9ebefb18 | 609 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
610 | lock_page(page); |
611 | if (!PageUptodate(page)) { | |
612 | ret = -EIO; | |
613 | goto out; | |
614 | } | |
615 | } | |
a52d9a80 CM |
616 | page_start = page->index << PAGE_CACHE_SHIFT; |
617 | ||
b888db2b | 618 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 619 | |
39279cc3 CM |
620 | unlock_page(page); |
621 | page_cache_release(page); | |
622 | out: | |
623 | return ret; | |
624 | } | |
625 | ||
626 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
627 | { | |
628 | struct inode *inode = dentry->d_inode; | |
629 | int err; | |
630 | ||
631 | err = inode_change_ok(inode, attr); | |
632 | if (err) | |
633 | return err; | |
634 | ||
635 | if (S_ISREG(inode->i_mode) && | |
636 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
637 | struct btrfs_trans_handle *trans; | |
638 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
639 | u64 mask = root->blocksize - 1; | |
640 | u64 pos = (inode->i_size + mask) & ~mask; | |
641 | u64 hole_size; | |
642 | ||
643 | if (attr->ia_size <= pos) | |
644 | goto out; | |
645 | ||
646 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
647 | ||
648 | hole_size = (attr->ia_size - pos + mask) & ~mask; | |
649 | hole_size >>= inode->i_blkbits; | |
650 | ||
651 | mutex_lock(&root->fs_info->fs_mutex); | |
652 | trans = btrfs_start_transaction(root, 1); | |
653 | btrfs_set_trans_block_group(trans, inode); | |
654 | err = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
655 | pos, 0, 0, hole_size); | |
39279cc3 CM |
656 | btrfs_end_transaction(trans, root); |
657 | mutex_unlock(&root->fs_info->fs_mutex); | |
54aa1f4d CM |
658 | if (err) |
659 | return err; | |
39279cc3 CM |
660 | } |
661 | out: | |
662 | err = inode_setattr(inode, attr); | |
663 | ||
664 | return err; | |
665 | } | |
666 | void btrfs_delete_inode(struct inode *inode) | |
667 | { | |
668 | struct btrfs_trans_handle *trans; | |
669 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
670 | int ret; | |
671 | ||
672 | truncate_inode_pages(&inode->i_data, 0); | |
673 | if (is_bad_inode(inode)) { | |
674 | goto no_delete; | |
675 | } | |
676 | inode->i_size = 0; | |
677 | mutex_lock(&root->fs_info->fs_mutex); | |
678 | trans = btrfs_start_transaction(root, 1); | |
679 | btrfs_set_trans_block_group(trans, inode); | |
680 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
54aa1f4d CM |
681 | if (ret) |
682 | goto no_delete_lock; | |
683 | ret = btrfs_free_inode(trans, root, inode); | |
684 | if (ret) | |
685 | goto no_delete_lock; | |
39279cc3 CM |
686 | btrfs_end_transaction(trans, root); |
687 | mutex_unlock(&root->fs_info->fs_mutex); | |
688 | btrfs_btree_balance_dirty(root); | |
689 | return; | |
54aa1f4d CM |
690 | |
691 | no_delete_lock: | |
692 | btrfs_end_transaction(trans, root); | |
693 | mutex_unlock(&root->fs_info->fs_mutex); | |
694 | btrfs_btree_balance_dirty(root); | |
39279cc3 CM |
695 | no_delete: |
696 | clear_inode(inode); | |
697 | } | |
698 | ||
699 | /* | |
700 | * this returns the key found in the dir entry in the location pointer. | |
701 | * If no dir entries were found, location->objectid is 0. | |
702 | */ | |
703 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
704 | struct btrfs_key *location) | |
705 | { | |
706 | const char *name = dentry->d_name.name; | |
707 | int namelen = dentry->d_name.len; | |
708 | struct btrfs_dir_item *di; | |
709 | struct btrfs_path *path; | |
710 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
711 | int ret; | |
712 | ||
713 | path = btrfs_alloc_path(); | |
714 | BUG_ON(!path); | |
39279cc3 CM |
715 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
716 | namelen, 0); | |
717 | if (!di || IS_ERR(di)) { | |
718 | location->objectid = 0; | |
719 | ret = 0; | |
720 | goto out; | |
721 | } | |
722 | btrfs_disk_key_to_cpu(location, &di->location); | |
723 | out: | |
724 | btrfs_release_path(root, path); | |
725 | btrfs_free_path(path); | |
726 | return ret; | |
727 | } | |
728 | ||
729 | /* | |
730 | * when we hit a tree root in a directory, the btrfs part of the inode | |
731 | * needs to be changed to reflect the root directory of the tree root. This | |
732 | * is kind of like crossing a mount point. | |
733 | */ | |
734 | static int fixup_tree_root_location(struct btrfs_root *root, | |
735 | struct btrfs_key *location, | |
736 | struct btrfs_root **sub_root) | |
737 | { | |
738 | struct btrfs_path *path; | |
739 | struct btrfs_root_item *ri; | |
740 | ||
741 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
742 | return 0; | |
743 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
744 | return 0; | |
745 | ||
746 | path = btrfs_alloc_path(); | |
747 | BUG_ON(!path); | |
748 | mutex_lock(&root->fs_info->fs_mutex); | |
749 | ||
750 | *sub_root = btrfs_read_fs_root(root->fs_info, location); | |
751 | if (IS_ERR(*sub_root)) | |
752 | return PTR_ERR(*sub_root); | |
753 | ||
754 | ri = &(*sub_root)->root_item; | |
755 | location->objectid = btrfs_root_dirid(ri); | |
756 | location->flags = 0; | |
757 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
758 | location->offset = 0; | |
759 | ||
760 | btrfs_free_path(path); | |
761 | mutex_unlock(&root->fs_info->fs_mutex); | |
762 | return 0; | |
763 | } | |
764 | ||
765 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
766 | { | |
767 | struct btrfs_iget_args *args = p; | |
768 | inode->i_ino = args->ino; | |
769 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
770 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
771 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
772 | return 0; |
773 | } | |
774 | ||
775 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
776 | { | |
777 | struct btrfs_iget_args *args = opaque; | |
778 | return (args->ino == inode->i_ino && | |
779 | args->root == BTRFS_I(inode)->root); | |
780 | } | |
781 | ||
782 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
783 | struct btrfs_root *root) | |
784 | { | |
785 | struct inode *inode; | |
786 | struct btrfs_iget_args args; | |
787 | args.ino = objectid; | |
788 | args.root = root; | |
789 | ||
790 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
791 | btrfs_init_locked_inode, | |
792 | (void *)&args); | |
793 | return inode; | |
794 | } | |
795 | ||
796 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
797 | struct nameidata *nd) | |
798 | { | |
799 | struct inode * inode; | |
800 | struct btrfs_inode *bi = BTRFS_I(dir); | |
801 | struct btrfs_root *root = bi->root; | |
802 | struct btrfs_root *sub_root = root; | |
803 | struct btrfs_key location; | |
804 | int ret; | |
805 | ||
806 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
807 | return ERR_PTR(-ENAMETOOLONG); | |
808 | mutex_lock(&root->fs_info->fs_mutex); | |
809 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
810 | mutex_unlock(&root->fs_info->fs_mutex); | |
811 | if (ret < 0) | |
812 | return ERR_PTR(ret); | |
813 | inode = NULL; | |
814 | if (location.objectid) { | |
815 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
816 | if (ret < 0) | |
817 | return ERR_PTR(ret); | |
818 | if (ret > 0) | |
819 | return ERR_PTR(-ENOENT); | |
820 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
821 | sub_root); | |
822 | if (!inode) | |
823 | return ERR_PTR(-EACCES); | |
824 | if (inode->i_state & I_NEW) { | |
825 | /* the inode and parent dir are two different roots */ | |
826 | if (sub_root != root) { | |
827 | igrab(inode); | |
828 | sub_root->inode = inode; | |
829 | } | |
830 | BTRFS_I(inode)->root = sub_root; | |
831 | memcpy(&BTRFS_I(inode)->location, &location, | |
832 | sizeof(location)); | |
833 | btrfs_read_locked_inode(inode); | |
834 | unlock_new_inode(inode); | |
835 | } | |
836 | } | |
837 | return d_splice_alias(inode, dentry); | |
838 | } | |
839 | ||
39279cc3 CM |
840 | static unsigned char btrfs_filetype_table[] = { |
841 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
842 | }; | |
843 | ||
844 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
845 | { | |
846 | struct inode *inode = filp->f_path.dentry->d_inode; | |
847 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
848 | struct btrfs_item *item; | |
849 | struct btrfs_dir_item *di; | |
850 | struct btrfs_key key; | |
851 | struct btrfs_path *path; | |
852 | int ret; | |
853 | u32 nritems; | |
854 | struct btrfs_leaf *leaf; | |
855 | int slot; | |
856 | int advance; | |
857 | unsigned char d_type; | |
858 | int over = 0; | |
859 | u32 di_cur; | |
860 | u32 di_total; | |
861 | u32 di_len; | |
862 | int key_type = BTRFS_DIR_INDEX_KEY; | |
863 | ||
864 | /* FIXME, use a real flag for deciding about the key type */ | |
865 | if (root->fs_info->tree_root == root) | |
866 | key_type = BTRFS_DIR_ITEM_KEY; | |
867 | mutex_lock(&root->fs_info->fs_mutex); | |
868 | key.objectid = inode->i_ino; | |
869 | key.flags = 0; | |
870 | btrfs_set_key_type(&key, key_type); | |
871 | key.offset = filp->f_pos; | |
872 | path = btrfs_alloc_path(); | |
2cc58cf2 | 873 | path->reada = 2; |
39279cc3 CM |
874 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
875 | if (ret < 0) | |
876 | goto err; | |
877 | advance = 0; | |
39279cc3 CM |
878 | while(1) { |
879 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
880 | nritems = btrfs_header_nritems(&leaf->header); | |
881 | slot = path->slots[0]; | |
882 | if (advance || slot >= nritems) { | |
883 | if (slot >= nritems -1) { | |
39279cc3 CM |
884 | ret = btrfs_next_leaf(root, path); |
885 | if (ret) | |
886 | break; | |
887 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
888 | nritems = btrfs_header_nritems(&leaf->header); | |
889 | slot = path->slots[0]; | |
890 | } else { | |
891 | slot++; | |
892 | path->slots[0]++; | |
893 | } | |
894 | } | |
895 | advance = 1; | |
896 | item = leaf->items + slot; | |
897 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) | |
898 | break; | |
899 | if (btrfs_disk_key_type(&item->key) != key_type) | |
900 | break; | |
901 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) | |
902 | continue; | |
903 | filp->f_pos = btrfs_disk_key_offset(&item->key); | |
904 | advance = 1; | |
905 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
906 | di_cur = 0; | |
907 | di_total = btrfs_item_size(leaf->items + slot); | |
908 | while(di_cur < di_total) { | |
909 | d_type = btrfs_filetype_table[btrfs_dir_type(di)]; | |
910 | over = filldir(dirent, (const char *)(di + 1), | |
911 | btrfs_dir_name_len(di), | |
912 | btrfs_disk_key_offset(&item->key), | |
913 | btrfs_disk_key_objectid(&di->location), | |
914 | d_type); | |
915 | if (over) | |
916 | goto nopos; | |
917 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
918 | di_cur += di_len; | |
919 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
920 | } | |
921 | } | |
922 | filp->f_pos++; | |
923 | nopos: | |
924 | ret = 0; | |
925 | err: | |
926 | btrfs_release_path(root, path); | |
927 | btrfs_free_path(path); | |
928 | mutex_unlock(&root->fs_info->fs_mutex); | |
929 | return ret; | |
930 | } | |
931 | ||
932 | int btrfs_write_inode(struct inode *inode, int wait) | |
933 | { | |
934 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
935 | struct btrfs_trans_handle *trans; | |
936 | int ret = 0; | |
937 | ||
938 | if (wait) { | |
939 | mutex_lock(&root->fs_info->fs_mutex); | |
940 | trans = btrfs_start_transaction(root, 1); | |
941 | btrfs_set_trans_block_group(trans, inode); | |
942 | ret = btrfs_commit_transaction(trans, root); | |
943 | mutex_unlock(&root->fs_info->fs_mutex); | |
944 | } | |
945 | return ret; | |
946 | } | |
947 | ||
948 | /* | |
54aa1f4d | 949 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
950 | * inode changes. But, it is most likely to find the inode in cache. |
951 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
952 | * to keep or drop this code. | |
953 | */ | |
954 | void btrfs_dirty_inode(struct inode *inode) | |
955 | { | |
956 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
957 | struct btrfs_trans_handle *trans; | |
958 | ||
959 | mutex_lock(&root->fs_info->fs_mutex); | |
960 | trans = btrfs_start_transaction(root, 1); | |
961 | btrfs_set_trans_block_group(trans, inode); | |
962 | btrfs_update_inode(trans, root, inode); | |
963 | btrfs_end_transaction(trans, root); | |
964 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
965 | } |
966 | ||
967 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
968 | struct btrfs_root *root, | |
969 | u64 objectid, | |
970 | struct btrfs_block_group_cache *group, | |
971 | int mode) | |
972 | { | |
973 | struct inode *inode; | |
974 | struct btrfs_inode_item inode_item; | |
975 | struct btrfs_key *location; | |
976 | int ret; | |
977 | int owner; | |
978 | ||
979 | inode = new_inode(root->fs_info->sb); | |
980 | if (!inode) | |
981 | return ERR_PTR(-ENOMEM); | |
982 | ||
b888db2b CM |
983 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
984 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 985 | BTRFS_I(inode)->root = root; |
b888db2b | 986 | |
39279cc3 CM |
987 | if (mode & S_IFDIR) |
988 | owner = 0; | |
989 | else | |
990 | owner = 1; | |
991 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
992 | BTRFS_I(inode)->block_group = group; | |
993 | ||
994 | inode->i_uid = current->fsuid; | |
995 | inode->i_gid = current->fsgid; | |
996 | inode->i_mode = mode; | |
997 | inode->i_ino = objectid; | |
998 | inode->i_blocks = 0; | |
999 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1000 | fill_inode_item(&inode_item, inode); | |
1001 | location = &BTRFS_I(inode)->location; | |
1002 | location->objectid = objectid; | |
1003 | location->flags = 0; | |
1004 | location->offset = 0; | |
1005 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1006 | ||
1007 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
54aa1f4d CM |
1008 | if (ret) |
1009 | return ERR_PTR(ret); | |
39279cc3 CM |
1010 | insert_inode_hash(inode); |
1011 | return inode; | |
1012 | } | |
1013 | ||
1014 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1015 | { | |
1016 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1017 | } | |
1018 | ||
1019 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1020 | struct dentry *dentry, struct inode *inode) | |
1021 | { | |
1022 | int ret; | |
1023 | struct btrfs_key key; | |
1024 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1025 | struct inode *parent_inode; |
39279cc3 CM |
1026 | key.objectid = inode->i_ino; |
1027 | key.flags = 0; | |
1028 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1029 | key.offset = 0; | |
1030 | ||
1031 | ret = btrfs_insert_dir_item(trans, root, | |
1032 | dentry->d_name.name, dentry->d_name.len, | |
1033 | dentry->d_parent->d_inode->i_ino, | |
1034 | &key, btrfs_inode_type(inode)); | |
1035 | if (ret == 0) { | |
79c44584 CM |
1036 | parent_inode = dentry->d_parent->d_inode; |
1037 | parent_inode->i_size += dentry->d_name.len * 2; | |
1038 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1039 | ret = btrfs_update_inode(trans, root, |
1040 | dentry->d_parent->d_inode); | |
1041 | } | |
1042 | return ret; | |
1043 | } | |
1044 | ||
1045 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1046 | struct dentry *dentry, struct inode *inode) | |
1047 | { | |
1048 | int err = btrfs_add_link(trans, dentry, inode); | |
1049 | if (!err) { | |
1050 | d_instantiate(dentry, inode); | |
1051 | return 0; | |
1052 | } | |
1053 | if (err > 0) | |
1054 | err = -EEXIST; | |
1055 | return err; | |
1056 | } | |
1057 | ||
618e21d5 JB |
1058 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1059 | int mode, dev_t rdev) | |
1060 | { | |
1061 | struct btrfs_trans_handle *trans; | |
1062 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1063 | struct inode *inode; | |
1064 | int err; | |
1065 | int drop_inode = 0; | |
1066 | u64 objectid; | |
1067 | ||
1068 | if (!new_valid_dev(rdev)) | |
1069 | return -EINVAL; | |
1070 | ||
1071 | mutex_lock(&root->fs_info->fs_mutex); | |
1072 | trans = btrfs_start_transaction(root, 1); | |
1073 | btrfs_set_trans_block_group(trans, dir); | |
1074 | ||
1075 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1076 | if (err) { | |
1077 | err = -ENOSPC; | |
1078 | goto out_unlock; | |
1079 | } | |
1080 | ||
1081 | inode = btrfs_new_inode(trans, root, objectid, | |
1082 | BTRFS_I(dir)->block_group, mode); | |
1083 | err = PTR_ERR(inode); | |
1084 | if (IS_ERR(inode)) | |
1085 | goto out_unlock; | |
1086 | ||
1087 | btrfs_set_trans_block_group(trans, inode); | |
1088 | err = btrfs_add_nondir(trans, dentry, inode); | |
1089 | if (err) | |
1090 | drop_inode = 1; | |
1091 | else { | |
1092 | inode->i_op = &btrfs_special_inode_operations; | |
1093 | init_special_inode(inode, inode->i_mode, rdev); | |
1094 | } | |
1095 | dir->i_sb->s_dirt = 1; | |
1096 | btrfs_update_inode_block_group(trans, inode); | |
1097 | btrfs_update_inode_block_group(trans, dir); | |
1098 | out_unlock: | |
1099 | btrfs_end_transaction(trans, root); | |
1100 | mutex_unlock(&root->fs_info->fs_mutex); | |
1101 | ||
1102 | if (drop_inode) { | |
1103 | inode_dec_link_count(inode); | |
1104 | iput(inode); | |
1105 | } | |
1106 | btrfs_btree_balance_dirty(root); | |
1107 | return err; | |
1108 | } | |
1109 | ||
39279cc3 CM |
1110 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1111 | int mode, struct nameidata *nd) | |
1112 | { | |
1113 | struct btrfs_trans_handle *trans; | |
1114 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1115 | struct inode *inode; | |
1116 | int err; | |
1117 | int drop_inode = 0; | |
1118 | u64 objectid; | |
1119 | ||
1120 | mutex_lock(&root->fs_info->fs_mutex); | |
1121 | trans = btrfs_start_transaction(root, 1); | |
1122 | btrfs_set_trans_block_group(trans, dir); | |
1123 | ||
1124 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1125 | if (err) { | |
1126 | err = -ENOSPC; | |
1127 | goto out_unlock; | |
1128 | } | |
1129 | ||
1130 | inode = btrfs_new_inode(trans, root, objectid, | |
1131 | BTRFS_I(dir)->block_group, mode); | |
1132 | err = PTR_ERR(inode); | |
1133 | if (IS_ERR(inode)) | |
1134 | goto out_unlock; | |
1135 | ||
1136 | btrfs_set_trans_block_group(trans, inode); | |
1137 | err = btrfs_add_nondir(trans, dentry, inode); | |
1138 | if (err) | |
1139 | drop_inode = 1; | |
1140 | else { | |
1141 | inode->i_mapping->a_ops = &btrfs_aops; | |
1142 | inode->i_fop = &btrfs_file_operations; | |
1143 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1144 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1145 | inode->i_mapping, GFP_NOFS); | |
b888db2b | 1146 | BTRFS_I(inode)->extent_tree.fill_delalloc = run_delalloc_range; |
39279cc3 CM |
1147 | } |
1148 | dir->i_sb->s_dirt = 1; | |
1149 | btrfs_update_inode_block_group(trans, inode); | |
1150 | btrfs_update_inode_block_group(trans, dir); | |
1151 | out_unlock: | |
1152 | btrfs_end_transaction(trans, root); | |
1153 | mutex_unlock(&root->fs_info->fs_mutex); | |
1154 | ||
1155 | if (drop_inode) { | |
1156 | inode_dec_link_count(inode); | |
1157 | iput(inode); | |
1158 | } | |
1159 | btrfs_btree_balance_dirty(root); | |
1160 | return err; | |
1161 | } | |
1162 | ||
1163 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1164 | struct dentry *dentry) | |
1165 | { | |
1166 | struct btrfs_trans_handle *trans; | |
1167 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1168 | struct inode *inode = old_dentry->d_inode; | |
1169 | int err; | |
1170 | int drop_inode = 0; | |
1171 | ||
1172 | if (inode->i_nlink == 0) | |
1173 | return -ENOENT; | |
1174 | ||
1175 | inc_nlink(inode); | |
1176 | mutex_lock(&root->fs_info->fs_mutex); | |
1177 | trans = btrfs_start_transaction(root, 1); | |
1178 | btrfs_set_trans_block_group(trans, dir); | |
1179 | atomic_inc(&inode->i_count); | |
1180 | err = btrfs_add_nondir(trans, dentry, inode); | |
1181 | if (err) | |
1182 | drop_inode = 1; | |
1183 | dir->i_sb->s_dirt = 1; | |
1184 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d CM |
1185 | err = btrfs_update_inode(trans, root, inode); |
1186 | if (err) | |
1187 | drop_inode = 1; | |
39279cc3 CM |
1188 | |
1189 | btrfs_end_transaction(trans, root); | |
1190 | mutex_unlock(&root->fs_info->fs_mutex); | |
1191 | ||
1192 | if (drop_inode) { | |
1193 | inode_dec_link_count(inode); | |
1194 | iput(inode); | |
1195 | } | |
1196 | btrfs_btree_balance_dirty(root); | |
1197 | return err; | |
1198 | } | |
1199 | ||
1200 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, | |
1201 | struct btrfs_root *root, | |
1202 | u64 objectid, u64 dirid) | |
1203 | { | |
1204 | int ret; | |
1205 | char buf[2]; | |
1206 | struct btrfs_key key; | |
1207 | ||
1208 | buf[0] = '.'; | |
1209 | buf[1] = '.'; | |
1210 | ||
1211 | key.objectid = objectid; | |
1212 | key.offset = 0; | |
1213 | key.flags = 0; | |
1214 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1215 | ||
1216 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, | |
1217 | &key, BTRFS_FT_DIR); | |
1218 | if (ret) | |
1219 | goto error; | |
1220 | key.objectid = dirid; | |
1221 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
1222 | &key, BTRFS_FT_DIR); | |
1223 | if (ret) | |
1224 | goto error; | |
1225 | error: | |
1226 | return ret; | |
1227 | } | |
1228 | ||
1229 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1230 | { | |
1231 | struct inode *inode; | |
1232 | struct btrfs_trans_handle *trans; | |
1233 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1234 | int err = 0; | |
1235 | int drop_on_err = 0; | |
1236 | u64 objectid; | |
1237 | ||
1238 | mutex_lock(&root->fs_info->fs_mutex); | |
1239 | trans = btrfs_start_transaction(root, 1); | |
1240 | btrfs_set_trans_block_group(trans, dir); | |
1241 | if (IS_ERR(trans)) { | |
1242 | err = PTR_ERR(trans); | |
1243 | goto out_unlock; | |
1244 | } | |
1245 | ||
1246 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1247 | if (err) { | |
1248 | err = -ENOSPC; | |
1249 | goto out_unlock; | |
1250 | } | |
1251 | ||
1252 | inode = btrfs_new_inode(trans, root, objectid, | |
1253 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1254 | if (IS_ERR(inode)) { | |
1255 | err = PTR_ERR(inode); | |
1256 | goto out_fail; | |
1257 | } | |
1258 | drop_on_err = 1; | |
1259 | inode->i_op = &btrfs_dir_inode_operations; | |
1260 | inode->i_fop = &btrfs_dir_file_operations; | |
1261 | btrfs_set_trans_block_group(trans, inode); | |
1262 | ||
1263 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); | |
1264 | if (err) | |
1265 | goto out_fail; | |
1266 | ||
1267 | inode->i_size = 6; | |
1268 | err = btrfs_update_inode(trans, root, inode); | |
1269 | if (err) | |
1270 | goto out_fail; | |
1271 | err = btrfs_add_link(trans, dentry, inode); | |
1272 | if (err) | |
1273 | goto out_fail; | |
1274 | d_instantiate(dentry, inode); | |
1275 | drop_on_err = 0; | |
1276 | dir->i_sb->s_dirt = 1; | |
1277 | btrfs_update_inode_block_group(trans, inode); | |
1278 | btrfs_update_inode_block_group(trans, dir); | |
1279 | ||
1280 | out_fail: | |
1281 | btrfs_end_transaction(trans, root); | |
1282 | out_unlock: | |
1283 | mutex_unlock(&root->fs_info->fs_mutex); | |
1284 | if (drop_on_err) | |
1285 | iput(inode); | |
1286 | btrfs_btree_balance_dirty(root); | |
1287 | return err; | |
1288 | } | |
1289 | ||
a52d9a80 CM |
1290 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1291 | size_t page_offset, u64 start, u64 end, | |
1292 | int create) | |
1293 | { | |
1294 | int ret; | |
1295 | int err = 0; | |
1296 | u64 blocknr; | |
1297 | u64 extent_start = 0; | |
1298 | u64 extent_end = 0; | |
1299 | u64 objectid = inode->i_ino; | |
1300 | u32 found_type; | |
1301 | int failed_insert = 0; | |
1302 | struct btrfs_path *path; | |
1303 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1304 | struct btrfs_file_extent_item *item; | |
1305 | struct btrfs_leaf *leaf; | |
1306 | struct btrfs_disk_key *found_key; | |
1307 | struct extent_map *em = NULL; | |
1308 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1309 | struct btrfs_trans_handle *trans = NULL; | |
1310 | ||
1311 | path = btrfs_alloc_path(); | |
1312 | BUG_ON(!path); | |
1313 | mutex_lock(&root->fs_info->fs_mutex); | |
1314 | ||
1315 | again: | |
1316 | em = lookup_extent_mapping(em_tree, start, end); | |
1317 | if (em) { | |
1318 | goto out; | |
1319 | } | |
1320 | if (!em) { | |
1321 | em = alloc_extent_map(GFP_NOFS); | |
1322 | if (!em) { | |
1323 | err = -ENOMEM; | |
1324 | goto out; | |
1325 | } | |
1326 | em->start = 0; | |
1327 | em->end = 0; | |
1328 | } | |
1329 | em->bdev = inode->i_sb->s_bdev; | |
1330 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
1331 | objectid, start, 0); | |
1332 | if (ret < 0) { | |
1333 | err = ret; | |
1334 | goto out; | |
1335 | } | |
1336 | ||
1337 | if (ret != 0) { | |
1338 | if (path->slots[0] == 0) | |
1339 | goto not_found; | |
1340 | path->slots[0]--; | |
1341 | } | |
1342 | ||
1343 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], | |
1344 | struct btrfs_file_extent_item); | |
1345 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
1346 | blocknr = btrfs_file_extent_disk_blocknr(item); | |
1347 | blocknr += btrfs_file_extent_offset(item); | |
1348 | ||
1349 | /* are we inside the extent that was found? */ | |
1350 | found_key = &leaf->items[path->slots[0]].key; | |
1351 | found_type = btrfs_disk_key_type(found_key); | |
1352 | if (btrfs_disk_key_objectid(found_key) != objectid || | |
1353 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
1354 | goto not_found; | |
1355 | } | |
1356 | ||
1357 | found_type = btrfs_file_extent_type(item); | |
1358 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1359 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1360 | extent_end = extent_start + | |
1361 | (btrfs_file_extent_num_blocks(item) << inode->i_blkbits); | |
1362 | err = 0; | |
b888db2b | 1363 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1364 | em->start = start; |
1365 | if (start < extent_start) { | |
b888db2b CM |
1366 | if (end < extent_start) |
1367 | goto not_found; | |
a52d9a80 CM |
1368 | em->end = extent_end - 1; |
1369 | } else { | |
1370 | em->end = end; | |
1371 | } | |
1372 | goto not_found_em; | |
1373 | } | |
1374 | if (btrfs_file_extent_disk_blocknr(item) == 0) { | |
1375 | em->start = extent_start; | |
1376 | em->end = extent_end - 1; | |
1377 | em->block_start = 0; | |
1378 | em->block_end = 0; | |
1379 | goto insert; | |
1380 | } | |
1381 | em->block_start = blocknr << inode->i_blkbits; | |
1382 | em->block_end = em->block_start + | |
1383 | (btrfs_file_extent_num_blocks(item) << | |
1384 | inode->i_blkbits) - 1; | |
1385 | em->start = extent_start; | |
1386 | em->end = extent_end - 1; | |
1387 | goto insert; | |
1388 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1389 | char *ptr; | |
1390 | char *map; | |
1391 | u32 size; | |
1392 | ||
1393 | size = btrfs_file_extent_inline_len(leaf->items + | |
1394 | path->slots[0]); | |
1395 | extent_end = extent_start + size; | |
b888db2b | 1396 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1397 | em->start = start; |
1398 | if (start < extent_start) { | |
b888db2b CM |
1399 | if (end < extent_start) |
1400 | goto not_found; | |
a52d9a80 CM |
1401 | em->end = extent_end - 1; |
1402 | } else { | |
1403 | em->end = end; | |
1404 | } | |
1405 | goto not_found_em; | |
1406 | } | |
1407 | em->block_start = EXTENT_MAP_INLINE; | |
1408 | em->block_end = EXTENT_MAP_INLINE; | |
1409 | em->start = extent_start; | |
1410 | em->end = extent_end - 1; | |
1411 | if (!page) { | |
1412 | goto insert; | |
1413 | } | |
1414 | ptr = btrfs_file_extent_inline_start(item); | |
1415 | map = kmap(page); | |
1416 | memcpy(map + page_offset, ptr, size); | |
1417 | flush_dcache_page(result->b_page); | |
1418 | kunmap(page); | |
1419 | set_extent_uptodate(em_tree, extent_start, | |
1420 | extent_end, GFP_NOFS); | |
1421 | goto insert; | |
1422 | } else { | |
1423 | printk("unkknown found_type %d\n", found_type); | |
1424 | WARN_ON(1); | |
1425 | } | |
1426 | not_found: | |
1427 | em->start = start; | |
1428 | em->end = end; | |
1429 | not_found_em: | |
1430 | em->block_start = 0; | |
1431 | em->block_end = 0; | |
1432 | insert: | |
1433 | btrfs_release_path(root, path); | |
1434 | if (em->start > start || em->end < start) { | |
b888db2b | 1435 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1436 | err = -EIO; |
1437 | goto out; | |
1438 | } | |
1439 | ret = add_extent_mapping(em_tree, em); | |
1440 | if (ret == -EEXIST) { | |
1441 | free_extent_map(em); | |
1442 | failed_insert++; | |
1443 | if (failed_insert > 5) { | |
1444 | printk("failing to insert %Lu %Lu\n", start, end); | |
1445 | err = -EIO; | |
1446 | goto out; | |
1447 | } | |
1448 | em = NULL; | |
1449 | goto again; | |
1450 | } | |
1451 | err = 0; | |
1452 | out: | |
1453 | btrfs_free_path(path); | |
1454 | if (trans) { | |
1455 | ret = btrfs_end_transaction(trans, root); | |
1456 | if (!err) | |
1457 | err = ret; | |
1458 | } | |
1459 | mutex_unlock(&root->fs_info->fs_mutex); | |
1460 | if (err) { | |
1461 | free_extent_map(em); | |
1462 | WARN_ON(1); | |
1463 | return ERR_PTR(err); | |
1464 | } | |
1465 | return em; | |
1466 | } | |
1467 | ||
1468 | ||
39279cc3 CM |
1469 | /* |
1470 | * FIBMAP and others want to pass in a fake buffer head. They need to | |
1471 | * use BTRFS_GET_BLOCK_NO_DIRECT to make sure we don't try to memcpy | |
1472 | * any packed file data into the fake bh | |
1473 | */ | |
1474 | #define BTRFS_GET_BLOCK_NO_CREATE 0 | |
1475 | #define BTRFS_GET_BLOCK_CREATE 1 | |
1476 | #define BTRFS_GET_BLOCK_NO_DIRECT 2 | |
1477 | ||
1478 | /* | |
1479 | * FIXME create==1 doe not work. | |
1480 | */ | |
1481 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, | |
1482 | struct buffer_head *result, int create) | |
1483 | { | |
1484 | int ret; | |
1485 | int err = 0; | |
1486 | u64 blocknr; | |
1487 | u64 extent_start = 0; | |
1488 | u64 extent_end = 0; | |
1489 | u64 objectid = inode->i_ino; | |
1490 | u32 found_type; | |
1491 | u64 alloc_hint = 0; | |
1492 | struct btrfs_path *path; | |
1493 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1494 | struct btrfs_file_extent_item *item; | |
1495 | struct btrfs_leaf *leaf; | |
1496 | struct btrfs_disk_key *found_key; | |
1497 | struct btrfs_trans_handle *trans = NULL; | |
1498 | ||
1499 | path = btrfs_alloc_path(); | |
1500 | BUG_ON(!path); | |
39279cc3 | 1501 | if (create & BTRFS_GET_BLOCK_CREATE) { |
9ebefb18 CM |
1502 | /* |
1503 | * danger!, this only works if the page is properly up | |
1504 | * to date somehow | |
1505 | */ | |
39279cc3 CM |
1506 | trans = btrfs_start_transaction(root, 1); |
1507 | if (!trans) { | |
1508 | err = -ENOMEM; | |
1509 | goto out; | |
1510 | } | |
1511 | ret = btrfs_drop_extents(trans, root, inode, | |
1512 | iblock << inode->i_blkbits, | |
1513 | (iblock + 1) << inode->i_blkbits, | |
1514 | &alloc_hint); | |
1515 | BUG_ON(ret); | |
1516 | } | |
1517 | ||
1518 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
f1ace244 | 1519 | objectid, |
39279cc3 CM |
1520 | iblock << inode->i_blkbits, 0); |
1521 | if (ret < 0) { | |
1522 | err = ret; | |
1523 | goto out; | |
1524 | } | |
1525 | ||
1526 | if (ret != 0) { | |
1527 | if (path->slots[0] == 0) { | |
1528 | btrfs_release_path(root, path); | |
1529 | goto not_found; | |
1530 | } | |
1531 | path->slots[0]--; | |
1532 | } | |
1533 | ||
1534 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], | |
1535 | struct btrfs_file_extent_item); | |
1536 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
1537 | blocknr = btrfs_file_extent_disk_blocknr(item); | |
1538 | blocknr += btrfs_file_extent_offset(item); | |
1539 | ||
1540 | /* are we inside the extent that was found? */ | |
1541 | found_key = &leaf->items[path->slots[0]].key; | |
1542 | found_type = btrfs_disk_key_type(found_key); | |
1543 | if (btrfs_disk_key_objectid(found_key) != objectid || | |
1544 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
1545 | extent_end = 0; | |
1546 | extent_start = 0; | |
1547 | goto not_found; | |
1548 | } | |
1549 | found_type = btrfs_file_extent_type(item); | |
1550 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1551 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1552 | extent_start = extent_start >> inode->i_blkbits; | |
1553 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
1554 | err = 0; | |
1555 | if (btrfs_file_extent_disk_blocknr(item) == 0) | |
1556 | goto out; | |
1557 | if (iblock >= extent_start && iblock < extent_end) { | |
1558 | btrfs_map_bh_to_logical(root, result, blocknr + | |
1559 | iblock - extent_start); | |
1560 | goto out; | |
1561 | } | |
1562 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1563 | char *ptr; | |
1564 | char *map; | |
1565 | u32 size; | |
1566 | ||
1567 | if (create & BTRFS_GET_BLOCK_NO_DIRECT) { | |
1568 | err = -EINVAL; | |
1569 | goto out; | |
1570 | } | |
1571 | size = btrfs_file_extent_inline_len(leaf->items + | |
1572 | path->slots[0]); | |
1573 | extent_end = (extent_start + size) >> inode->i_blkbits; | |
1574 | extent_start >>= inode->i_blkbits; | |
1575 | if (iblock < extent_start || iblock > extent_end) { | |
1576 | goto not_found; | |
1577 | } | |
1578 | ptr = btrfs_file_extent_inline_start(item); | |
1579 | map = kmap(result->b_page); | |
1580 | memcpy(map, ptr, size); | |
1581 | memset(map + size, 0, PAGE_CACHE_SIZE - size); | |
1582 | flush_dcache_page(result->b_page); | |
1583 | kunmap(result->b_page); | |
1584 | set_buffer_uptodate(result); | |
1585 | SetPageChecked(result->b_page); | |
1586 | btrfs_map_bh_to_logical(root, result, 0); | |
1587 | } | |
1588 | not_found: | |
1589 | if (create & BTRFS_GET_BLOCK_CREATE) { | |
1590 | struct btrfs_key ins; | |
1591 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, | |
6702ed49 | 1592 | 1, 0, alloc_hint, (u64)-1, |
39279cc3 | 1593 | &ins, 1); |
54aa1f4d CM |
1594 | if (ret) { |
1595 | err = ret; | |
1596 | goto out; | |
1597 | } | |
39279cc3 CM |
1598 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, |
1599 | iblock << inode->i_blkbits, | |
1600 | ins.objectid, ins.offset, | |
1601 | ins.offset); | |
54aa1f4d CM |
1602 | if (ret) { |
1603 | err = ret; | |
1604 | goto out; | |
1605 | } | |
39279cc3 CM |
1606 | btrfs_map_bh_to_logical(root, result, ins.objectid); |
1607 | } | |
1608 | out: | |
54aa1f4d CM |
1609 | if (trans) { |
1610 | ret = btrfs_end_transaction(trans, root); | |
1611 | if (!err) | |
1612 | err = ret; | |
1613 | } | |
39279cc3 CM |
1614 | btrfs_free_path(path); |
1615 | return err; | |
1616 | } | |
1617 | ||
1618 | int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1619 | struct buffer_head *result, int create) | |
1620 | { | |
1621 | int err; | |
1622 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1623 | mutex_lock(&root->fs_info->fs_mutex); | |
1624 | err = btrfs_get_block_lock(inode, iblock, result, create); | |
1625 | mutex_unlock(&root->fs_info->fs_mutex); | |
1626 | return err; | |
1627 | } | |
1628 | ||
1629 | static int btrfs_get_block_bmap(struct inode *inode, sector_t iblock, | |
1630 | struct buffer_head *result, int create) | |
1631 | { | |
1632 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
a52d9a80 CM |
1633 | u64 start = iblock << inode->i_blkbits; |
1634 | u64 end = start + root->blocksize -1; | |
1635 | struct extent_map *em; | |
1636 | ||
1637 | em = btrfs_get_extent(inode, NULL, 0, start, end, 0); | |
1638 | if (em && !IS_ERR(em) && em->block_start != EXTENT_MAP_INLINE && | |
1639 | em->block_start != 0) { | |
1640 | u64 offset; | |
1641 | offset = start - em->start; | |
1642 | start = (em->block_start + offset) >> inode->i_blkbits; | |
1643 | btrfs_map_bh_to_logical(root, result, start); | |
1644 | } | |
39279cc3 CM |
1645 | return 0; |
1646 | } | |
1647 | ||
1648 | static sector_t btrfs_bmap(struct address_space *as, sector_t block) | |
1649 | { | |
1650 | return generic_block_bmap(as, block, btrfs_get_block_bmap); | |
1651 | } | |
1652 | ||
1653 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1654 | unsigned from, unsigned to) | |
1655 | { | |
a52d9a80 CM |
1656 | return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1657 | page->mapping->host, page, from, to, | |
1658 | btrfs_get_extent); | |
39279cc3 CM |
1659 | } |
1660 | ||
a52d9a80 | 1661 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1662 | { |
a52d9a80 CM |
1663 | struct extent_map_tree *tree; |
1664 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1665 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1666 | } |
a52d9a80 | 1667 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1668 | { |
a52d9a80 | 1669 | struct extent_map_tree *tree; |
b888db2b CM |
1670 | |
1671 | ||
1672 | if (current->flags & PF_MEMALLOC) { | |
1673 | redirty_page_for_writepage(wbc, page); | |
1674 | unlock_page(page); | |
1675 | return 0; | |
1676 | } | |
a52d9a80 CM |
1677 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1678 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1679 | } |
1680 | ||
a52d9a80 | 1681 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 1682 | { |
a52d9a80 CM |
1683 | struct extent_map_tree *tree; |
1684 | int ret; | |
8c2383c3 | 1685 | |
a52d9a80 CM |
1686 | if (page->private != 1) { |
1687 | WARN_ON(1); | |
1688 | return try_to_free_buffers(page); | |
39279cc3 | 1689 | } |
a52d9a80 CM |
1690 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1691 | ret = try_release_extent_mapping(tree, page); | |
1692 | if (ret == 1) { | |
1693 | ClearPagePrivate(page); | |
1694 | set_page_private(page, 0); | |
1695 | page_cache_release(page); | |
39279cc3 | 1696 | } |
a52d9a80 | 1697 | return ret; |
39279cc3 CM |
1698 | } |
1699 | ||
a52d9a80 | 1700 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 1701 | { |
a52d9a80 | 1702 | struct extent_map_tree *tree; |
39279cc3 | 1703 | |
a52d9a80 CM |
1704 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1705 | extent_invalidatepage(tree, page, offset); | |
1706 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
1707 | } |
1708 | ||
9ebefb18 CM |
1709 | /* |
1710 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
1711 | * called from a page fault handler when a page is first dirtied. Hence we must | |
1712 | * be careful to check for EOF conditions here. We set the page up correctly | |
1713 | * for a written page which means we get ENOSPC checking when writing into | |
1714 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
1715 | * support these features. | |
1716 | * | |
1717 | * We are not allowed to take the i_mutex here so we have to play games to | |
1718 | * protect against truncate races as the page could now be beyond EOF. Because | |
1719 | * vmtruncate() writes the inode size before removing pages, once we have the | |
1720 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
1721 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
1722 | * unlock the page. | |
1723 | */ | |
1724 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
1725 | { | |
1726 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
1727 | unsigned long end; | |
1728 | loff_t size; | |
1729 | int ret = -EINVAL; | |
a52d9a80 | 1730 | u64 page_start; |
9ebefb18 CM |
1731 | |
1732 | lock_page(page); | |
1733 | wait_on_page_writeback(page); | |
9ebefb18 | 1734 | size = i_size_read(inode); |
a52d9a80 CM |
1735 | page_start = page->index << PAGE_CACHE_SHIFT; |
1736 | ||
9ebefb18 | 1737 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 1738 | (page_start > size)) { |
9ebefb18 CM |
1739 | /* page got truncated out from underneath us */ |
1740 | goto out_unlock; | |
1741 | } | |
1742 | ||
1743 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 1744 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
1745 | end = size & ~PAGE_CACHE_MASK; |
1746 | else | |
1747 | end = PAGE_CACHE_SIZE; | |
1748 | ||
b888db2b | 1749 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
1750 | |
1751 | out_unlock: | |
1752 | unlock_page(page); | |
1753 | return ret; | |
1754 | } | |
1755 | ||
39279cc3 CM |
1756 | static void btrfs_truncate(struct inode *inode) |
1757 | { | |
1758 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1759 | int ret; | |
1760 | struct btrfs_trans_handle *trans; | |
1761 | ||
1762 | if (!S_ISREG(inode->i_mode)) | |
1763 | return; | |
1764 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1765 | return; | |
1766 | ||
1767 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
1768 | ||
1769 | mutex_lock(&root->fs_info->fs_mutex); | |
1770 | trans = btrfs_start_transaction(root, 1); | |
1771 | btrfs_set_trans_block_group(trans, inode); | |
1772 | ||
1773 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1774 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 CM |
1775 | btrfs_update_inode(trans, root, inode); |
1776 | ret = btrfs_end_transaction(trans, root); | |
1777 | BUG_ON(ret); | |
1778 | mutex_unlock(&root->fs_info->fs_mutex); | |
1779 | btrfs_btree_balance_dirty(root); | |
1780 | } | |
1781 | ||
1782 | int btrfs_commit_write(struct file *file, struct page *page, | |
1783 | unsigned from, unsigned to) | |
1784 | { | |
a52d9a80 CM |
1785 | return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1786 | page->mapping->host, page, from, to); | |
39279cc3 CM |
1787 | } |
1788 | ||
1789 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) | |
1790 | { | |
1791 | struct btrfs_trans_handle *trans; | |
1792 | struct btrfs_key key; | |
1793 | struct btrfs_root_item root_item; | |
1794 | struct btrfs_inode_item *inode_item; | |
1795 | struct buffer_head *subvol; | |
1796 | struct btrfs_leaf *leaf; | |
1797 | struct btrfs_root *new_root; | |
1798 | struct inode *inode; | |
1799 | struct inode *dir; | |
1800 | int ret; | |
54aa1f4d | 1801 | int err; |
39279cc3 CM |
1802 | u64 objectid; |
1803 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
1804 | ||
1805 | mutex_lock(&root->fs_info->fs_mutex); | |
1806 | trans = btrfs_start_transaction(root, 1); | |
1807 | BUG_ON(!trans); | |
1808 | ||
6702ed49 | 1809 | subvol = btrfs_alloc_free_block(trans, root, 0, 0); |
54aa1f4d CM |
1810 | if (IS_ERR(subvol)) |
1811 | return PTR_ERR(subvol); | |
39279cc3 CM |
1812 | leaf = btrfs_buffer_leaf(subvol); |
1813 | btrfs_set_header_nritems(&leaf->header, 0); | |
1814 | btrfs_set_header_level(&leaf->header, 0); | |
1815 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); | |
1816 | btrfs_set_header_generation(&leaf->header, trans->transid); | |
1817 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); | |
1818 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, | |
1819 | sizeof(leaf->header.fsid)); | |
ccd467d6 | 1820 | btrfs_mark_buffer_dirty(subvol); |
39279cc3 CM |
1821 | |
1822 | inode_item = &root_item.inode; | |
1823 | memset(inode_item, 0, sizeof(*inode_item)); | |
1824 | btrfs_set_inode_generation(inode_item, 1); | |
1825 | btrfs_set_inode_size(inode_item, 3); | |
1826 | btrfs_set_inode_nlink(inode_item, 1); | |
1827 | btrfs_set_inode_nblocks(inode_item, 1); | |
1828 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
1829 | ||
1830 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); | |
1831 | btrfs_set_root_refs(&root_item, 1); | |
5eda7b5e CM |
1832 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
1833 | root_item.drop_level = 0; | |
39279cc3 CM |
1834 | brelse(subvol); |
1835 | subvol = NULL; | |
1836 | ||
1837 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1838 | 0, &objectid); | |
54aa1f4d CM |
1839 | if (ret) |
1840 | goto fail; | |
39279cc3 CM |
1841 | |
1842 | btrfs_set_root_dirid(&root_item, new_dirid); | |
1843 | ||
1844 | key.objectid = objectid; | |
1845 | key.offset = 1; | |
1846 | key.flags = 0; | |
1847 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
1848 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1849 | &root_item); | |
54aa1f4d CM |
1850 | if (ret) |
1851 | goto fail; | |
39279cc3 CM |
1852 | |
1853 | /* | |
1854 | * insert the directory item | |
1855 | */ | |
1856 | key.offset = (u64)-1; | |
1857 | dir = root->fs_info->sb->s_root->d_inode; | |
1858 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1859 | name, namelen, dir->i_ino, &key, | |
1860 | BTRFS_FT_DIR); | |
54aa1f4d CM |
1861 | if (ret) |
1862 | goto fail; | |
39279cc3 CM |
1863 | |
1864 | ret = btrfs_commit_transaction(trans, root); | |
54aa1f4d CM |
1865 | if (ret) |
1866 | goto fail_commit; | |
39279cc3 CM |
1867 | |
1868 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
1869 | BUG_ON(!new_root); | |
1870 | ||
1871 | trans = btrfs_start_transaction(new_root, 1); | |
1872 | BUG_ON(!trans); | |
1873 | ||
1874 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
1875 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
1876 | if (IS_ERR(inode)) |
1877 | goto fail; | |
39279cc3 CM |
1878 | inode->i_op = &btrfs_dir_inode_operations; |
1879 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 1880 | new_root->inode = inode; |
39279cc3 CM |
1881 | |
1882 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
54aa1f4d CM |
1883 | if (ret) |
1884 | goto fail; | |
39279cc3 CM |
1885 | |
1886 | inode->i_nlink = 1; | |
1887 | inode->i_size = 6; | |
1888 | ret = btrfs_update_inode(trans, new_root, inode); | |
54aa1f4d CM |
1889 | if (ret) |
1890 | goto fail; | |
1891 | fail: | |
1892 | err = btrfs_commit_transaction(trans, root); | |
1893 | if (err && !ret) | |
1894 | ret = err; | |
1895 | fail_commit: | |
39279cc3 CM |
1896 | mutex_unlock(&root->fs_info->fs_mutex); |
1897 | btrfs_btree_balance_dirty(root); | |
54aa1f4d | 1898 | return ret; |
39279cc3 CM |
1899 | } |
1900 | ||
1901 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
1902 | { | |
1903 | struct btrfs_trans_handle *trans; | |
1904 | struct btrfs_key key; | |
1905 | struct btrfs_root_item new_root_item; | |
83df7c1d | 1906 | struct buffer_head *tmp; |
39279cc3 | 1907 | int ret; |
54aa1f4d | 1908 | int err; |
39279cc3 CM |
1909 | u64 objectid; |
1910 | ||
1911 | if (!root->ref_cows) | |
1912 | return -EINVAL; | |
1913 | ||
1914 | mutex_lock(&root->fs_info->fs_mutex); | |
1915 | trans = btrfs_start_transaction(root, 1); | |
1916 | BUG_ON(!trans); | |
1917 | ||
1918 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
1919 | if (ret) |
1920 | goto fail; | |
39279cc3 CM |
1921 | |
1922 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1923 | 0, &objectid); | |
54aa1f4d CM |
1924 | if (ret) |
1925 | goto fail; | |
39279cc3 CM |
1926 | |
1927 | memcpy(&new_root_item, &root->root_item, | |
1928 | sizeof(new_root_item)); | |
1929 | ||
1930 | key.objectid = objectid; | |
1931 | key.offset = 1; | |
1932 | key.flags = 0; | |
1933 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
83df7c1d | 1934 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
39279cc3 CM |
1935 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
1936 | ||
1937 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1938 | &new_root_item); | |
54aa1f4d CM |
1939 | if (ret) |
1940 | goto fail; | |
39279cc3 CM |
1941 | |
1942 | /* | |
1943 | * insert the directory item | |
1944 | */ | |
1945 | key.offset = (u64)-1; | |
1946 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1947 | name, namelen, | |
1948 | root->fs_info->sb->s_root->d_inode->i_ino, | |
1949 | &key, BTRFS_FT_DIR); | |
1950 | ||
54aa1f4d CM |
1951 | if (ret) |
1952 | goto fail; | |
39279cc3 CM |
1953 | |
1954 | ret = btrfs_inc_root_ref(trans, root); | |
54aa1f4d CM |
1955 | if (ret) |
1956 | goto fail; | |
39279cc3 | 1957 | |
54aa1f4d CM |
1958 | fail: |
1959 | err = btrfs_commit_transaction(trans, root); | |
1960 | if (err && !ret) | |
1961 | ret = err; | |
39279cc3 CM |
1962 | mutex_unlock(&root->fs_info->fs_mutex); |
1963 | btrfs_btree_balance_dirty(root); | |
54aa1f4d | 1964 | return ret; |
39279cc3 CM |
1965 | } |
1966 | ||
1967 | int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int | |
1968 | cmd, unsigned long arg) | |
1969 | { | |
1970 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1971 | struct btrfs_ioctl_vol_args vol_args; | |
1972 | int ret = 0; | |
1973 | struct btrfs_dir_item *di; | |
1974 | int namelen; | |
1975 | struct btrfs_path *path; | |
1976 | u64 root_dirid; | |
1977 | ||
1978 | switch (cmd) { | |
1979 | case BTRFS_IOC_SNAP_CREATE: | |
1980 | if (copy_from_user(&vol_args, | |
1981 | (struct btrfs_ioctl_vol_args __user *)arg, | |
1982 | sizeof(vol_args))) | |
1983 | return -EFAULT; | |
1984 | namelen = strlen(vol_args.name); | |
1985 | if (namelen > BTRFS_VOL_NAME_MAX) | |
1986 | return -EINVAL; | |
8a712645 CM |
1987 | if (strchr(vol_args.name, '/')) |
1988 | return -EINVAL; | |
39279cc3 CM |
1989 | path = btrfs_alloc_path(); |
1990 | if (!path) | |
1991 | return -ENOMEM; | |
1992 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
1993 | mutex_lock(&root->fs_info->fs_mutex); | |
1994 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
1995 | path, root_dirid, | |
1996 | vol_args.name, namelen, 0); | |
1997 | mutex_unlock(&root->fs_info->fs_mutex); | |
1998 | btrfs_free_path(path); | |
1999 | if (di && !IS_ERR(di)) | |
2000 | return -EEXIST; | |
54aa1f4d CM |
2001 | if (IS_ERR(di)) |
2002 | return PTR_ERR(di); | |
39279cc3 CM |
2003 | |
2004 | if (root == root->fs_info->tree_root) | |
2005 | ret = create_subvol(root, vol_args.name, namelen); | |
2006 | else | |
2007 | ret = create_snapshot(root, vol_args.name, namelen); | |
39279cc3 | 2008 | break; |
6702ed49 CM |
2009 | |
2010 | case BTRFS_IOC_DEFRAG: | |
2011 | mutex_lock(&root->fs_info->fs_mutex); | |
e9d0b13b CM |
2012 | btrfs_defrag_root(root, 0); |
2013 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
6702ed49 CM |
2014 | mutex_unlock(&root->fs_info->fs_mutex); |
2015 | ret = 0; | |
2016 | break; | |
39279cc3 CM |
2017 | default: |
2018 | return -ENOTTY; | |
2019 | } | |
2020 | return ret; | |
2021 | } | |
2022 | ||
2023 | #ifdef CONFIG_COMPAT | |
2024 | long btrfs_compat_ioctl(struct file *file, unsigned int cmd, | |
2025 | unsigned long arg) | |
2026 | { | |
2027 | struct inode *inode = file->f_path.dentry->d_inode; | |
2028 | int ret; | |
2029 | lock_kernel(); | |
2030 | ret = btrfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); | |
2031 | unlock_kernel(); | |
2032 | return ret; | |
2033 | ||
2034 | } | |
2035 | #endif | |
2036 | ||
2037 | /* | |
2038 | * Called inside transaction, so use GFP_NOFS | |
2039 | */ | |
2040 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2041 | { | |
2042 | struct btrfs_inode *ei; | |
2043 | ||
2044 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2045 | if (!ei) | |
2046 | return NULL; | |
15ee9bc7 | 2047 | ei->last_trans = 0; |
39279cc3 CM |
2048 | return &ei->vfs_inode; |
2049 | } | |
2050 | ||
2051 | void btrfs_destroy_inode(struct inode *inode) | |
2052 | { | |
2053 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2054 | WARN_ON(inode->i_data.nrpages); | |
2055 | ||
2056 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2057 | } | |
2058 | ||
2059 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2060 | unsigned long flags) | |
2061 | { | |
2062 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2063 | ||
2064 | inode_init_once(&ei->vfs_inode); | |
2065 | } | |
2066 | ||
2067 | void btrfs_destroy_cachep(void) | |
2068 | { | |
2069 | if (btrfs_inode_cachep) | |
2070 | kmem_cache_destroy(btrfs_inode_cachep); | |
2071 | if (btrfs_trans_handle_cachep) | |
2072 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2073 | if (btrfs_transaction_cachep) | |
2074 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2075 | if (btrfs_bit_radix_cachep) | |
2076 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2077 | if (btrfs_path_cachep) | |
2078 | kmem_cache_destroy(btrfs_path_cachep); | |
2079 | } | |
2080 | ||
92fee66d CM |
2081 | static struct kmem_cache *cache_create(const char *name, size_t size, |
2082 | unsigned long extra_flags, | |
2083 | void (*ctor)(void *, struct kmem_cache *, | |
2084 | unsigned long)) | |
2085 | { | |
2086 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2087 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2088 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2089 | ,NULL | |
2090 | #endif | |
2091 | ); | |
2092 | } | |
2093 | ||
39279cc3 CM |
2094 | int btrfs_init_cachep(void) |
2095 | { | |
92fee66d CM |
2096 | btrfs_inode_cachep = cache_create("btrfs_inode_cache", |
2097 | sizeof(struct btrfs_inode), | |
2098 | 0, init_once); | |
39279cc3 CM |
2099 | if (!btrfs_inode_cachep) |
2100 | goto fail; | |
92fee66d | 2101 | btrfs_trans_handle_cachep = cache_create("btrfs_trans_handle_cache", |
39279cc3 | 2102 | sizeof(struct btrfs_trans_handle), |
92fee66d | 2103 | 0, NULL); |
39279cc3 CM |
2104 | if (!btrfs_trans_handle_cachep) |
2105 | goto fail; | |
92fee66d | 2106 | btrfs_transaction_cachep = cache_create("btrfs_transaction_cache", |
39279cc3 | 2107 | sizeof(struct btrfs_transaction), |
92fee66d | 2108 | 0, NULL); |
39279cc3 CM |
2109 | if (!btrfs_transaction_cachep) |
2110 | goto fail; | |
92fee66d CM |
2111 | btrfs_path_cachep = cache_create("btrfs_path_cache", |
2112 | sizeof(struct btrfs_transaction), | |
2113 | 0, NULL); | |
39279cc3 CM |
2114 | if (!btrfs_path_cachep) |
2115 | goto fail; | |
92fee66d CM |
2116 | btrfs_bit_radix_cachep = cache_create("btrfs_radix", 256, |
2117 | SLAB_DESTROY_BY_RCU, NULL); | |
39279cc3 CM |
2118 | if (!btrfs_bit_radix_cachep) |
2119 | goto fail; | |
2120 | return 0; | |
2121 | fail: | |
2122 | btrfs_destroy_cachep(); | |
2123 | return -ENOMEM; | |
2124 | } | |
2125 | ||
2126 | static int btrfs_getattr(struct vfsmount *mnt, | |
2127 | struct dentry *dentry, struct kstat *stat) | |
2128 | { | |
2129 | struct inode *inode = dentry->d_inode; | |
2130 | generic_fillattr(inode, stat); | |
2131 | stat->blksize = 256 * 1024; | |
2132 | return 0; | |
2133 | } | |
2134 | ||
2135 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2136 | struct inode * new_dir,struct dentry *new_dentry) | |
2137 | { | |
2138 | struct btrfs_trans_handle *trans; | |
2139 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2140 | struct inode *new_inode = new_dentry->d_inode; | |
2141 | struct inode *old_inode = old_dentry->d_inode; | |
2142 | struct timespec ctime = CURRENT_TIME; | |
2143 | struct btrfs_path *path; | |
2144 | struct btrfs_dir_item *di; | |
2145 | int ret; | |
2146 | ||
2147 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2148 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2149 | return -ENOTEMPTY; | |
2150 | } | |
2151 | mutex_lock(&root->fs_info->fs_mutex); | |
2152 | trans = btrfs_start_transaction(root, 1); | |
2153 | btrfs_set_trans_block_group(trans, new_dir); | |
2154 | path = btrfs_alloc_path(); | |
2155 | if (!path) { | |
2156 | ret = -ENOMEM; | |
2157 | goto out_fail; | |
2158 | } | |
2159 | ||
2160 | old_dentry->d_inode->i_nlink++; | |
2161 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2162 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2163 | old_inode->i_ctime = ctime; | |
2164 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { | |
2165 | struct btrfs_key *location = &BTRFS_I(new_dir)->location; | |
2166 | u64 old_parent_oid; | |
2167 | di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino, | |
2168 | "..", 2, -1); | |
2169 | if (IS_ERR(di)) { | |
2170 | ret = PTR_ERR(di); | |
2171 | goto out_fail; | |
2172 | } | |
2173 | if (!di) { | |
2174 | ret = -ENOENT; | |
2175 | goto out_fail; | |
2176 | } | |
2177 | old_parent_oid = btrfs_disk_key_objectid(&di->location); | |
2178 | ret = btrfs_del_item(trans, root, path); | |
2179 | if (ret) { | |
39279cc3 CM |
2180 | goto out_fail; |
2181 | } | |
2182 | btrfs_release_path(root, path); | |
2183 | ||
2184 | di = btrfs_lookup_dir_index_item(trans, root, path, | |
2185 | old_inode->i_ino, | |
2186 | old_parent_oid, | |
2187 | "..", 2, -1); | |
2188 | if (IS_ERR(di)) { | |
2189 | ret = PTR_ERR(di); | |
2190 | goto out_fail; | |
2191 | } | |
2192 | if (!di) { | |
2193 | ret = -ENOENT; | |
2194 | goto out_fail; | |
2195 | } | |
2196 | ret = btrfs_del_item(trans, root, path); | |
2197 | if (ret) { | |
39279cc3 CM |
2198 | goto out_fail; |
2199 | } | |
2200 | btrfs_release_path(root, path); | |
2201 | ||
2202 | ret = btrfs_insert_dir_item(trans, root, "..", 2, | |
2203 | old_inode->i_ino, location, | |
2204 | BTRFS_FT_DIR); | |
2205 | if (ret) | |
2206 | goto out_fail; | |
2207 | } | |
2208 | ||
2209 | ||
2210 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); | |
2211 | if (ret) | |
2212 | goto out_fail; | |
2213 | ||
2214 | if (new_inode) { | |
2215 | new_inode->i_ctime = CURRENT_TIME; | |
2216 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2217 | if (ret) | |
2218 | goto out_fail; | |
2219 | if (S_ISDIR(new_inode->i_mode)) | |
2220 | clear_nlink(new_inode); | |
2221 | else | |
2222 | drop_nlink(new_inode); | |
54aa1f4d CM |
2223 | ret = btrfs_update_inode(trans, root, new_inode); |
2224 | if (ret) | |
2225 | goto out_fail; | |
39279cc3 CM |
2226 | } |
2227 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2228 | if (ret) | |
2229 | goto out_fail; | |
2230 | ||
2231 | out_fail: | |
2232 | btrfs_free_path(path); | |
2233 | btrfs_end_transaction(trans, root); | |
2234 | mutex_unlock(&root->fs_info->fs_mutex); | |
2235 | return ret; | |
2236 | } | |
2237 | ||
2238 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2239 | const char *symname) | |
2240 | { | |
2241 | struct btrfs_trans_handle *trans; | |
2242 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2243 | struct btrfs_path *path; | |
2244 | struct btrfs_key key; | |
2245 | struct inode *inode; | |
2246 | int err; | |
2247 | int drop_inode = 0; | |
2248 | u64 objectid; | |
2249 | int name_len; | |
2250 | int datasize; | |
2251 | char *ptr; | |
2252 | struct btrfs_file_extent_item *ei; | |
2253 | ||
2254 | name_len = strlen(symname) + 1; | |
2255 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2256 | return -ENAMETOOLONG; | |
2257 | mutex_lock(&root->fs_info->fs_mutex); | |
2258 | trans = btrfs_start_transaction(root, 1); | |
2259 | btrfs_set_trans_block_group(trans, dir); | |
2260 | ||
2261 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2262 | if (err) { | |
2263 | err = -ENOSPC; | |
2264 | goto out_unlock; | |
2265 | } | |
2266 | ||
2267 | inode = btrfs_new_inode(trans, root, objectid, | |
2268 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2269 | err = PTR_ERR(inode); | |
2270 | if (IS_ERR(inode)) | |
2271 | goto out_unlock; | |
2272 | ||
2273 | btrfs_set_trans_block_group(trans, inode); | |
2274 | err = btrfs_add_nondir(trans, dentry, inode); | |
2275 | if (err) | |
2276 | drop_inode = 1; | |
2277 | else { | |
2278 | inode->i_mapping->a_ops = &btrfs_aops; | |
2279 | inode->i_fop = &btrfs_file_operations; | |
2280 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2281 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2282 | inode->i_mapping, GFP_NOFS); | |
b888db2b | 2283 | BTRFS_I(inode)->extent_tree.fill_delalloc = run_delalloc_range; |
39279cc3 CM |
2284 | } |
2285 | dir->i_sb->s_dirt = 1; | |
2286 | btrfs_update_inode_block_group(trans, inode); | |
2287 | btrfs_update_inode_block_group(trans, dir); | |
2288 | if (drop_inode) | |
2289 | goto out_unlock; | |
2290 | ||
2291 | path = btrfs_alloc_path(); | |
2292 | BUG_ON(!path); | |
2293 | key.objectid = inode->i_ino; | |
2294 | key.offset = 0; | |
2295 | key.flags = 0; | |
2296 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
2297 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2298 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2299 | datasize); | |
54aa1f4d CM |
2300 | if (err) { |
2301 | drop_inode = 1; | |
2302 | goto out_unlock; | |
2303 | } | |
39279cc3 CM |
2304 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
2305 | path->slots[0], struct btrfs_file_extent_item); | |
2306 | btrfs_set_file_extent_generation(ei, trans->transid); | |
2307 | btrfs_set_file_extent_type(ei, | |
2308 | BTRFS_FILE_EXTENT_INLINE); | |
2309 | ptr = btrfs_file_extent_inline_start(ei); | |
2310 | btrfs_memcpy(root, path->nodes[0]->b_data, | |
2311 | ptr, symname, name_len); | |
ccd467d6 | 2312 | btrfs_mark_buffer_dirty(path->nodes[0]); |
39279cc3 CM |
2313 | btrfs_free_path(path); |
2314 | inode->i_op = &btrfs_symlink_inode_operations; | |
2315 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2316 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2317 | err = btrfs_update_inode(trans, root, inode); |
2318 | if (err) | |
2319 | drop_inode = 1; | |
39279cc3 CM |
2320 | |
2321 | out_unlock: | |
2322 | btrfs_end_transaction(trans, root); | |
2323 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
2324 | if (drop_inode) { |
2325 | inode_dec_link_count(inode); | |
2326 | iput(inode); | |
2327 | } | |
2328 | btrfs_btree_balance_dirty(root); | |
2329 | return err; | |
2330 | } | |
2331 | ||
2332 | static struct inode_operations btrfs_dir_inode_operations = { | |
2333 | .lookup = btrfs_lookup, | |
2334 | .create = btrfs_create, | |
2335 | .unlink = btrfs_unlink, | |
2336 | .link = btrfs_link, | |
2337 | .mkdir = btrfs_mkdir, | |
2338 | .rmdir = btrfs_rmdir, | |
2339 | .rename = btrfs_rename, | |
2340 | .symlink = btrfs_symlink, | |
2341 | .setattr = btrfs_setattr, | |
618e21d5 | 2342 | .mknod = btrfs_mknod, |
39279cc3 CM |
2343 | }; |
2344 | ||
2345 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2346 | .lookup = btrfs_lookup, | |
2347 | }; | |
2348 | ||
2349 | static struct file_operations btrfs_dir_file_operations = { | |
2350 | .llseek = generic_file_llseek, | |
2351 | .read = generic_read_dir, | |
2352 | .readdir = btrfs_readdir, | |
2353 | .ioctl = btrfs_ioctl, | |
2354 | #ifdef CONFIG_COMPAT | |
2355 | .compat_ioctl = btrfs_compat_ioctl, | |
2356 | #endif | |
2357 | }; | |
2358 | ||
2359 | static struct address_space_operations btrfs_aops = { | |
2360 | .readpage = btrfs_readpage, | |
2361 | .writepage = btrfs_writepage, | |
2362 | .sync_page = block_sync_page, | |
2363 | .prepare_write = btrfs_prepare_write, | |
2364 | .commit_write = btrfs_commit_write, | |
2365 | .bmap = btrfs_bmap, | |
a52d9a80 CM |
2366 | .invalidatepage = btrfs_invalidatepage, |
2367 | .releasepage = btrfs_releasepage, | |
2368 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2369 | }; |
2370 | ||
2371 | static struct address_space_operations btrfs_symlink_aops = { | |
2372 | .readpage = btrfs_readpage, | |
2373 | .writepage = btrfs_writepage, | |
2374 | }; | |
2375 | ||
2376 | static struct inode_operations btrfs_file_inode_operations = { | |
2377 | .truncate = btrfs_truncate, | |
2378 | .getattr = btrfs_getattr, | |
2379 | .setattr = btrfs_setattr, | |
2380 | }; | |
2381 | ||
618e21d5 JB |
2382 | static struct inode_operations btrfs_special_inode_operations = { |
2383 | .getattr = btrfs_getattr, | |
2384 | .setattr = btrfs_setattr, | |
2385 | }; | |
2386 | ||
39279cc3 CM |
2387 | static struct inode_operations btrfs_symlink_inode_operations = { |
2388 | .readlink = generic_readlink, | |
2389 | .follow_link = page_follow_link_light, | |
2390 | .put_link = page_put_link, | |
2391 | }; |