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Btrfs: Back port to 2.6.18-el kernels
[deliverable/linux.git] / fs / btrfs / inode.c
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
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>
33 #include <linux/bit_spinlock.h>
34 #include <linux/version.h>
35 #include <linux/xattr.h>
36 #include "ctree.h"
37 #include "disk-io.h"
38 #include "transaction.h"
39 #include "btrfs_inode.h"
40 #include "ioctl.h"
41 #include "print-tree.h"
42
43 struct btrfs_iget_args {
44 u64 ino;
45 struct btrfs_root *root;
46 };
47
48 static struct inode_operations btrfs_dir_inode_operations;
49 static struct inode_operations btrfs_symlink_inode_operations;
50 static struct inode_operations btrfs_dir_ro_inode_operations;
51 static struct inode_operations btrfs_special_inode_operations;
52 static struct inode_operations btrfs_file_inode_operations;
53 static struct address_space_operations btrfs_aops;
54 static struct address_space_operations btrfs_symlink_aops;
55 static struct file_operations btrfs_dir_file_operations;
56 static struct extent_map_ops btrfs_extent_map_ops;
57
58 static struct kmem_cache *btrfs_inode_cachep;
59 struct kmem_cache *btrfs_trans_handle_cachep;
60 struct kmem_cache *btrfs_transaction_cachep;
61 struct kmem_cache *btrfs_bit_radix_cachep;
62 struct kmem_cache *btrfs_path_cachep;
63
64 #define S_SHIFT 12
65 static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
66 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
67 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
68 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
69 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
70 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
71 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
72 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
73 };
74
75 static int cow_file_range(struct inode *inode, u64 start, u64 end)
76 {
77 struct btrfs_root *root = BTRFS_I(inode)->root;
78 struct btrfs_trans_handle *trans;
79 u64 alloc_hint = 0;
80 u64 num_bytes;
81 u64 cur_alloc_size;
82 u64 blocksize = root->sectorsize;
83 struct btrfs_key ins;
84 int ret;
85
86 trans = btrfs_start_transaction(root, 1);
87 BUG_ON(!trans);
88 btrfs_set_trans_block_group(trans, inode);
89
90 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
91 num_bytes = max(blocksize, num_bytes);
92 ret = btrfs_drop_extents(trans, root, inode,
93 start, start + num_bytes, start, &alloc_hint);
94
95 if (alloc_hint == EXTENT_MAP_INLINE)
96 goto out;
97
98 while(num_bytes > 0) {
99 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
100 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
101 root->root_key.objectid,
102 trans->transid,
103 inode->i_ino, start, 0,
104 alloc_hint, (u64)-1, &ins, 1);
105 if (ret) {
106 WARN_ON(1);
107 goto out;
108 }
109 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
110 start, ins.objectid, ins.offset,
111 ins.offset);
112 num_bytes -= cur_alloc_size;
113 alloc_hint = ins.objectid + ins.offset;
114 start += cur_alloc_size;
115 }
116 out:
117 btrfs_end_transaction(trans, root);
118 return ret;
119 }
120
121 static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
122 {
123 u64 extent_start;
124 u64 extent_end;
125 u64 bytenr;
126 u64 cow_end;
127 struct btrfs_root *root = BTRFS_I(inode)->root;
128 struct extent_buffer *leaf;
129 int found_type;
130 struct btrfs_path *path;
131 struct btrfs_file_extent_item *item;
132 int ret;
133 int err;
134 struct btrfs_key found_key;
135
136 path = btrfs_alloc_path();
137 BUG_ON(!path);
138 again:
139 ret = btrfs_lookup_file_extent(NULL, root, path,
140 inode->i_ino, start, 0);
141 if (ret < 0) {
142 btrfs_free_path(path);
143 return ret;
144 }
145
146 cow_end = end;
147 if (ret != 0) {
148 if (path->slots[0] == 0)
149 goto not_found;
150 path->slots[0]--;
151 }
152
153 leaf = path->nodes[0];
154 item = btrfs_item_ptr(leaf, path->slots[0],
155 struct btrfs_file_extent_item);
156
157 /* are we inside the extent that was found? */
158 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
159 found_type = btrfs_key_type(&found_key);
160 if (found_key.objectid != inode->i_ino ||
161 found_type != BTRFS_EXTENT_DATA_KEY) {
162 goto not_found;
163 }
164
165 found_type = btrfs_file_extent_type(leaf, item);
166 extent_start = found_key.offset;
167 if (found_type == BTRFS_FILE_EXTENT_REG) {
168 extent_end = extent_start +
169 btrfs_file_extent_num_bytes(leaf, item);
170 err = 0;
171
172 if (start < extent_start || start >= extent_end)
173 goto not_found;
174
175 cow_end = min(end, extent_end - 1);
176 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
177 if (bytenr == 0)
178 goto not_found;
179
180 bytenr += btrfs_file_extent_offset(leaf, item);
181 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
182 goto not_found;
183 }
184
185 start = extent_end;
186 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
187 goto not_found;
188 }
189 loop:
190 if (start > end) {
191 btrfs_free_path(path);
192 return 0;
193 }
194 btrfs_release_path(root, path);
195 goto again;
196
197 not_found:
198 cow_file_range(inode, start, cow_end);
199 start = cow_end + 1;
200 goto loop;
201 }
202
203 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
204 {
205 struct btrfs_root *root = BTRFS_I(inode)->root;
206 int ret;
207
208 mutex_lock(&root->fs_info->fs_mutex);
209 if (btrfs_test_opt(root, NODATACOW))
210 ret = run_delalloc_nocow(inode, start, end);
211 else
212 ret = cow_file_range(inode, start, end);
213 mutex_unlock(&root->fs_info->fs_mutex);
214 return ret;
215 }
216
217 int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
218 {
219 struct inode *inode = page->mapping->host;
220 struct btrfs_root *root = BTRFS_I(inode)->root;
221 struct btrfs_trans_handle *trans;
222 char *kaddr;
223 int ret = 0;
224 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
225 size_t offset = start - page_start;
226
227 if (btrfs_test_opt(root, NODATASUM))
228 return 0;
229
230 mutex_lock(&root->fs_info->fs_mutex);
231 trans = btrfs_start_transaction(root, 1);
232 btrfs_set_trans_block_group(trans, inode);
233 kaddr = kmap(page);
234 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
235 start, kaddr + offset, end - start + 1);
236 kunmap(page);
237 ret = btrfs_end_transaction(trans, root);
238 BUG_ON(ret);
239 mutex_unlock(&root->fs_info->fs_mutex);
240 return ret;
241 }
242
243 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
244 {
245 int ret = 0;
246 struct inode *inode = page->mapping->host;
247 struct btrfs_root *root = BTRFS_I(inode)->root;
248 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
249 struct btrfs_csum_item *item;
250 struct btrfs_path *path = NULL;
251 u32 csum;
252
253 if (btrfs_test_opt(root, NODATASUM))
254 return 0;
255
256 mutex_lock(&root->fs_info->fs_mutex);
257 path = btrfs_alloc_path();
258 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
259 if (IS_ERR(item)) {
260 ret = PTR_ERR(item);
261 /* a csum that isn't present is a preallocated region. */
262 if (ret == -ENOENT || ret == -EFBIG)
263 ret = 0;
264 csum = 0;
265 goto out;
266 }
267 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
268 BTRFS_CRC32_SIZE);
269 set_state_private(em_tree, start, csum);
270 out:
271 if (path)
272 btrfs_free_path(path);
273 mutex_unlock(&root->fs_info->fs_mutex);
274 return ret;
275 }
276
277 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
278 {
279 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
280 struct inode *inode = page->mapping->host;
281 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
282 char *kaddr;
283 u64 private;
284 int ret;
285 struct btrfs_root *root = BTRFS_I(inode)->root;
286 u32 csum = ~(u32)0;
287 unsigned long flags;
288
289 if (btrfs_test_opt(root, NODATASUM))
290 return 0;
291
292 ret = get_state_private(em_tree, start, &private);
293 local_irq_save(flags);
294 kaddr = kmap_atomic(page, KM_IRQ0);
295 if (ret) {
296 goto zeroit;
297 }
298 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
299 btrfs_csum_final(csum, (char *)&csum);
300 if (csum != private) {
301 goto zeroit;
302 }
303 kunmap_atomic(kaddr, KM_IRQ0);
304 local_irq_restore(flags);
305 return 0;
306
307 zeroit:
308 printk("btrfs csum failed ino %lu off %llu\n",
309 page->mapping->host->i_ino, (unsigned long long)start);
310 memset(kaddr + offset, 1, end - start + 1);
311 flush_dcache_page(page);
312 kunmap_atomic(kaddr, KM_IRQ0);
313 local_irq_restore(flags);
314 return 0;
315 }
316
317 void btrfs_read_locked_inode(struct inode *inode)
318 {
319 struct btrfs_path *path;
320 struct extent_buffer *leaf;
321 struct btrfs_inode_item *inode_item;
322 struct btrfs_inode_timespec *tspec;
323 struct btrfs_root *root = BTRFS_I(inode)->root;
324 struct btrfs_key location;
325 u64 alloc_group_block;
326 u32 rdev;
327 int ret;
328
329 path = btrfs_alloc_path();
330 BUG_ON(!path);
331 mutex_lock(&root->fs_info->fs_mutex);
332
333 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
334 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
335 if (ret)
336 goto make_bad;
337
338 leaf = path->nodes[0];
339 inode_item = btrfs_item_ptr(leaf, path->slots[0],
340 struct btrfs_inode_item);
341
342 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
343 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
344 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
345 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
346 inode->i_size = btrfs_inode_size(leaf, inode_item);
347
348 tspec = btrfs_inode_atime(inode_item);
349 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
350 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
351
352 tspec = btrfs_inode_mtime(inode_item);
353 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
354 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
355
356 tspec = btrfs_inode_ctime(inode_item);
357 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
358 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
359
360 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
361 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
362 inode->i_rdev = 0;
363 rdev = btrfs_inode_rdev(leaf, inode_item);
364
365 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
366 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
367 alloc_group_block);
368
369 btrfs_free_path(path);
370 inode_item = NULL;
371
372 mutex_unlock(&root->fs_info->fs_mutex);
373
374 switch (inode->i_mode & S_IFMT) {
375 case S_IFREG:
376 inode->i_mapping->a_ops = &btrfs_aops;
377 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
378 inode->i_fop = &btrfs_file_operations;
379 inode->i_op = &btrfs_file_inode_operations;
380 break;
381 case S_IFDIR:
382 inode->i_fop = &btrfs_dir_file_operations;
383 if (root == root->fs_info->tree_root)
384 inode->i_op = &btrfs_dir_ro_inode_operations;
385 else
386 inode->i_op = &btrfs_dir_inode_operations;
387 break;
388 case S_IFLNK:
389 inode->i_op = &btrfs_symlink_inode_operations;
390 inode->i_mapping->a_ops = &btrfs_symlink_aops;
391 break;
392 default:
393 init_special_inode(inode, inode->i_mode, rdev);
394 break;
395 }
396 return;
397
398 make_bad:
399 btrfs_release_path(root, path);
400 btrfs_free_path(path);
401 mutex_unlock(&root->fs_info->fs_mutex);
402 make_bad_inode(inode);
403 }
404
405 static void fill_inode_item(struct extent_buffer *leaf,
406 struct btrfs_inode_item *item,
407 struct inode *inode)
408 {
409 btrfs_set_inode_uid(leaf, item, inode->i_uid);
410 btrfs_set_inode_gid(leaf, item, inode->i_gid);
411 btrfs_set_inode_size(leaf, item, inode->i_size);
412 btrfs_set_inode_mode(leaf, item, inode->i_mode);
413 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
414
415 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
416 inode->i_atime.tv_sec);
417 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
418 inode->i_atime.tv_nsec);
419
420 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
421 inode->i_mtime.tv_sec);
422 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
423 inode->i_mtime.tv_nsec);
424
425 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
426 inode->i_ctime.tv_sec);
427 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
428 inode->i_ctime.tv_nsec);
429
430 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
431 btrfs_set_inode_generation(leaf, item, inode->i_generation);
432 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
433 btrfs_set_inode_block_group(leaf, item,
434 BTRFS_I(inode)->block_group->key.objectid);
435 }
436
437 int btrfs_update_inode(struct btrfs_trans_handle *trans,
438 struct btrfs_root *root,
439 struct inode *inode)
440 {
441 struct btrfs_inode_item *inode_item;
442 struct btrfs_path *path;
443 struct extent_buffer *leaf;
444 int ret;
445
446 path = btrfs_alloc_path();
447 BUG_ON(!path);
448 ret = btrfs_lookup_inode(trans, root, path,
449 &BTRFS_I(inode)->location, 1);
450 if (ret) {
451 if (ret > 0)
452 ret = -ENOENT;
453 goto failed;
454 }
455
456 leaf = path->nodes[0];
457 inode_item = btrfs_item_ptr(leaf, path->slots[0],
458 struct btrfs_inode_item);
459
460 fill_inode_item(leaf, inode_item, inode);
461 btrfs_mark_buffer_dirty(leaf);
462 btrfs_set_inode_last_trans(trans, inode);
463 ret = 0;
464 failed:
465 btrfs_release_path(root, path);
466 btrfs_free_path(path);
467 return ret;
468 }
469
470
471 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
472 struct btrfs_root *root,
473 struct inode *dir,
474 struct dentry *dentry)
475 {
476 struct btrfs_path *path;
477 const char *name = dentry->d_name.name;
478 int name_len = dentry->d_name.len;
479 int ret = 0;
480 struct extent_buffer *leaf;
481 struct btrfs_dir_item *di;
482 struct btrfs_key key;
483
484 path = btrfs_alloc_path();
485 if (!path) {
486 ret = -ENOMEM;
487 goto err;
488 }
489
490 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
491 name, name_len, -1);
492 if (IS_ERR(di)) {
493 ret = PTR_ERR(di);
494 goto err;
495 }
496 if (!di) {
497 ret = -ENOENT;
498 goto err;
499 }
500 leaf = path->nodes[0];
501 btrfs_dir_item_key_to_cpu(leaf, di, &key);
502 ret = btrfs_delete_one_dir_name(trans, root, path, di);
503 if (ret)
504 goto err;
505 btrfs_release_path(root, path);
506
507 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
508 key.objectid, name, name_len, -1);
509 if (IS_ERR(di)) {
510 ret = PTR_ERR(di);
511 goto err;
512 }
513 if (!di) {
514 ret = -ENOENT;
515 goto err;
516 }
517 ret = btrfs_delete_one_dir_name(trans, root, path, di);
518
519 dentry->d_inode->i_ctime = dir->i_ctime;
520 ret = btrfs_del_inode_ref(trans, root, name, name_len,
521 dentry->d_inode->i_ino,
522 dentry->d_parent->d_inode->i_ino);
523 if (ret) {
524 printk("failed to delete reference to %.*s, "
525 "inode %lu parent %lu\n", name_len, name,
526 dentry->d_inode->i_ino,
527 dentry->d_parent->d_inode->i_ino);
528 }
529 err:
530 btrfs_free_path(path);
531 if (!ret) {
532 dir->i_size -= name_len * 2;
533 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
534 btrfs_update_inode(trans, root, dir);
535 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
536 dentry->d_inode->i_nlink--;
537 #else
538 drop_nlink(dentry->d_inode);
539 #endif
540 ret = btrfs_update_inode(trans, root, dentry->d_inode);
541 dir->i_sb->s_dirt = 1;
542 }
543 return ret;
544 }
545
546 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
547 {
548 struct btrfs_root *root;
549 struct btrfs_trans_handle *trans;
550 int ret;
551 unsigned long nr;
552
553 root = BTRFS_I(dir)->root;
554 mutex_lock(&root->fs_info->fs_mutex);
555 trans = btrfs_start_transaction(root, 1);
556
557 btrfs_set_trans_block_group(trans, dir);
558 ret = btrfs_unlink_trans(trans, root, dir, dentry);
559 nr = trans->blocks_used;
560
561 btrfs_end_transaction(trans, root);
562 mutex_unlock(&root->fs_info->fs_mutex);
563 btrfs_btree_balance_dirty(root, nr);
564
565 return ret;
566 }
567
568 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
569 {
570 struct inode *inode = dentry->d_inode;
571 int err;
572 int ret;
573 struct btrfs_root *root = BTRFS_I(dir)->root;
574 struct btrfs_trans_handle *trans;
575 unsigned long nr;
576
577 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
578 return -ENOTEMPTY;
579
580 mutex_lock(&root->fs_info->fs_mutex);
581 trans = btrfs_start_transaction(root, 1);
582 btrfs_set_trans_block_group(trans, dir);
583
584 /* now the directory is empty */
585 err = btrfs_unlink_trans(trans, root, dir, dentry);
586 if (!err) {
587 inode->i_size = 0;
588 }
589
590 nr = trans->blocks_used;
591 ret = btrfs_end_transaction(trans, root);
592 mutex_unlock(&root->fs_info->fs_mutex);
593 btrfs_btree_balance_dirty(root, nr);
594
595 if (ret && !err)
596 err = ret;
597 return err;
598 }
599
600 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
601 struct btrfs_root *root,
602 struct inode *inode)
603 {
604 struct btrfs_path *path;
605 int ret;
606
607 clear_inode(inode);
608
609 path = btrfs_alloc_path();
610 BUG_ON(!path);
611 ret = btrfs_lookup_inode(trans, root, path,
612 &BTRFS_I(inode)->location, -1);
613 if (ret > 0)
614 ret = -ENOENT;
615 if (!ret)
616 ret = btrfs_del_item(trans, root, path);
617 btrfs_free_path(path);
618 return ret;
619 }
620
621 /*
622 * this can truncate away extent items, csum items and directory items.
623 * It starts at a high offset and removes keys until it can't find
624 * any higher than i_size.
625 *
626 * csum items that cross the new i_size are truncated to the new size
627 * as well.
628 */
629 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
630 struct btrfs_root *root,
631 struct inode *inode)
632 {
633 int ret;
634 struct btrfs_path *path;
635 struct btrfs_key key;
636 struct btrfs_key found_key;
637 u32 found_type;
638 struct extent_buffer *leaf;
639 struct btrfs_file_extent_item *fi;
640 u64 extent_start = 0;
641 u64 extent_num_bytes = 0;
642 u64 item_end = 0;
643 u64 root_gen = 0;
644 u64 root_owner = 0;
645 int found_extent;
646 int del_item;
647 int extent_type = -1;
648
649 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
650 path = btrfs_alloc_path();
651 path->reada = -1;
652 BUG_ON(!path);
653
654 /* FIXME, add redo link to tree so we don't leak on crash */
655 key.objectid = inode->i_ino;
656 key.offset = (u64)-1;
657 key.type = (u8)-1;
658
659 while(1) {
660 btrfs_init_path(path);
661 fi = NULL;
662 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
663 if (ret < 0) {
664 goto error;
665 }
666 if (ret > 0) {
667 BUG_ON(path->slots[0] == 0);
668 path->slots[0]--;
669 }
670 leaf = path->nodes[0];
671 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
672 found_type = btrfs_key_type(&found_key);
673
674 if (found_key.objectid != inode->i_ino)
675 break;
676
677 if (found_type != BTRFS_CSUM_ITEM_KEY &&
678 found_type != BTRFS_DIR_ITEM_KEY &&
679 found_type != BTRFS_DIR_INDEX_KEY &&
680 found_type != BTRFS_EXTENT_DATA_KEY)
681 break;
682
683 item_end = found_key.offset;
684 if (found_type == BTRFS_EXTENT_DATA_KEY) {
685 fi = btrfs_item_ptr(leaf, path->slots[0],
686 struct btrfs_file_extent_item);
687 extent_type = btrfs_file_extent_type(leaf, fi);
688 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
689 item_end +=
690 btrfs_file_extent_num_bytes(leaf, fi);
691 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
692 struct btrfs_item *item = btrfs_item_nr(leaf,
693 path->slots[0]);
694 item_end += btrfs_file_extent_inline_len(leaf,
695 item);
696 }
697 item_end--;
698 }
699 if (found_type == BTRFS_CSUM_ITEM_KEY) {
700 ret = btrfs_csum_truncate(trans, root, path,
701 inode->i_size);
702 BUG_ON(ret);
703 }
704 if (item_end < inode->i_size) {
705 if (found_type == BTRFS_DIR_ITEM_KEY) {
706 found_type = BTRFS_INODE_ITEM_KEY;
707 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
708 found_type = BTRFS_CSUM_ITEM_KEY;
709 } else if (found_type) {
710 found_type--;
711 } else {
712 break;
713 }
714 btrfs_set_key_type(&key, found_type);
715 btrfs_release_path(root, path);
716 continue;
717 }
718 if (found_key.offset >= inode->i_size)
719 del_item = 1;
720 else
721 del_item = 0;
722 found_extent = 0;
723
724 /* FIXME, shrink the extent if the ref count is only 1 */
725 if (found_type != BTRFS_EXTENT_DATA_KEY)
726 goto delete;
727
728 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
729 u64 num_dec;
730 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
731 if (!del_item) {
732 u64 orig_num_bytes =
733 btrfs_file_extent_num_bytes(leaf, fi);
734 extent_num_bytes = inode->i_size -
735 found_key.offset + root->sectorsize - 1;
736 btrfs_set_file_extent_num_bytes(leaf, fi,
737 extent_num_bytes);
738 num_dec = (orig_num_bytes -
739 extent_num_bytes) >> 9;
740 if (extent_start != 0) {
741 inode->i_blocks -= num_dec;
742 }
743 btrfs_mark_buffer_dirty(leaf);
744 } else {
745 extent_num_bytes =
746 btrfs_file_extent_disk_num_bytes(leaf,
747 fi);
748 /* FIXME blocksize != 4096 */
749 num_dec = btrfs_file_extent_num_bytes(leaf,
750 fi) >> 9;
751 if (extent_start != 0) {
752 found_extent = 1;
753 inode->i_blocks -= num_dec;
754 }
755 root_gen = btrfs_header_generation(leaf);
756 root_owner = btrfs_header_owner(leaf);
757 }
758 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
759 !del_item) {
760 u32 newsize = inode->i_size - found_key.offset;
761 newsize = btrfs_file_extent_calc_inline_size(newsize);
762 ret = btrfs_truncate_item(trans, root, path,
763 newsize, 1);
764 BUG_ON(ret);
765 }
766 delete:
767 if (del_item) {
768 ret = btrfs_del_item(trans, root, path);
769 if (ret)
770 goto error;
771 } else {
772 break;
773 }
774 btrfs_release_path(root, path);
775 if (found_extent) {
776 ret = btrfs_free_extent(trans, root, extent_start,
777 extent_num_bytes,
778 root_owner,
779 root_gen, inode->i_ino,
780 found_key.offset, 0);
781 BUG_ON(ret);
782 }
783 }
784 ret = 0;
785 error:
786 btrfs_release_path(root, path);
787 btrfs_free_path(path);
788 inode->i_sb->s_dirt = 1;
789 return ret;
790 }
791
792 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
793 size_t zero_start)
794 {
795 char *kaddr;
796 int ret = 0;
797 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
798 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
799 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
800
801 set_page_extent_mapped(page);
802
803 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
804 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
805 page_end, GFP_NOFS);
806 if (zero_start != PAGE_CACHE_SIZE) {
807 kaddr = kmap(page);
808 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
809 flush_dcache_page(page);
810 kunmap(page);
811 }
812 set_page_dirty(page);
813 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
814
815 return ret;
816 }
817
818 /*
819 * taken from block_truncate_page, but does cow as it zeros out
820 * any bytes left in the last page in the file.
821 */
822 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
823 {
824 struct inode *inode = mapping->host;
825 struct btrfs_root *root = BTRFS_I(inode)->root;
826 u32 blocksize = root->sectorsize;
827 pgoff_t index = from >> PAGE_CACHE_SHIFT;
828 unsigned offset = from & (PAGE_CACHE_SIZE-1);
829 struct page *page;
830 int ret = 0;
831 u64 page_start;
832
833 if ((offset & (blocksize - 1)) == 0)
834 goto out;
835
836 down_read(&root->snap_sem);
837 ret = -ENOMEM;
838 page = grab_cache_page(mapping, index);
839 if (!page)
840 goto out;
841 if (!PageUptodate(page)) {
842 ret = btrfs_readpage(NULL, page);
843 lock_page(page);
844 if (!PageUptodate(page)) {
845 ret = -EIO;
846 goto out;
847 }
848 }
849 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
850
851 ret = btrfs_cow_one_page(inode, page, offset);
852
853 unlock_page(page);
854 page_cache_release(page);
855 up_read(&BTRFS_I(inode)->root->snap_sem);
856 out:
857 return ret;
858 }
859
860 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
861 {
862 struct inode *inode = dentry->d_inode;
863 int err;
864
865 err = inode_change_ok(inode, attr);
866 if (err)
867 return err;
868
869 if (S_ISREG(inode->i_mode) &&
870 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
871 struct btrfs_trans_handle *trans;
872 struct btrfs_root *root = BTRFS_I(inode)->root;
873 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
874
875 u64 mask = root->sectorsize - 1;
876 u64 pos = (inode->i_size + mask) & ~mask;
877 u64 block_end = attr->ia_size | mask;
878 u64 hole_size;
879 u64 alloc_hint = 0;
880
881 if (attr->ia_size <= pos)
882 goto out;
883
884 btrfs_truncate_page(inode->i_mapping, inode->i_size);
885
886 lock_extent(em_tree, pos, block_end, GFP_NOFS);
887 hole_size = (attr->ia_size - pos + mask) & ~mask;
888
889 mutex_lock(&root->fs_info->fs_mutex);
890 trans = btrfs_start_transaction(root, 1);
891 btrfs_set_trans_block_group(trans, inode);
892 err = btrfs_drop_extents(trans, root, inode,
893 pos, pos + hole_size, pos,
894 &alloc_hint);
895
896 if (alloc_hint != EXTENT_MAP_INLINE) {
897 err = btrfs_insert_file_extent(trans, root,
898 inode->i_ino,
899 pos, 0, 0, hole_size);
900 }
901 btrfs_end_transaction(trans, root);
902 mutex_unlock(&root->fs_info->fs_mutex);
903 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
904 if (err)
905 return err;
906 }
907 out:
908 err = inode_setattr(inode, attr);
909
910 return err;
911 }
912 void btrfs_delete_inode(struct inode *inode)
913 {
914 struct btrfs_trans_handle *trans;
915 struct btrfs_root *root = BTRFS_I(inode)->root;
916 unsigned long nr;
917 int ret;
918
919 truncate_inode_pages(&inode->i_data, 0);
920 if (is_bad_inode(inode)) {
921 goto no_delete;
922 }
923
924 inode->i_size = 0;
925 mutex_lock(&root->fs_info->fs_mutex);
926 trans = btrfs_start_transaction(root, 1);
927
928 btrfs_set_trans_block_group(trans, inode);
929 ret = btrfs_truncate_in_trans(trans, root, inode);
930 if (ret)
931 goto no_delete_lock;
932 ret = btrfs_delete_xattrs(trans, root, inode);
933 if (ret)
934 goto no_delete_lock;
935 ret = btrfs_free_inode(trans, root, inode);
936 if (ret)
937 goto no_delete_lock;
938 nr = trans->blocks_used;
939
940 btrfs_end_transaction(trans, root);
941 mutex_unlock(&root->fs_info->fs_mutex);
942 btrfs_btree_balance_dirty(root, nr);
943 return;
944
945 no_delete_lock:
946 nr = trans->blocks_used;
947 btrfs_end_transaction(trans, root);
948 mutex_unlock(&root->fs_info->fs_mutex);
949 btrfs_btree_balance_dirty(root, nr);
950 no_delete:
951 clear_inode(inode);
952 }
953
954 /*
955 * this returns the key found in the dir entry in the location pointer.
956 * If no dir entries were found, location->objectid is 0.
957 */
958 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
959 struct btrfs_key *location)
960 {
961 const char *name = dentry->d_name.name;
962 int namelen = dentry->d_name.len;
963 struct btrfs_dir_item *di;
964 struct btrfs_path *path;
965 struct btrfs_root *root = BTRFS_I(dir)->root;
966 int ret = 0;
967
968 if (namelen == 1 && strcmp(name, ".") == 0) {
969 location->objectid = dir->i_ino;
970 location->type = BTRFS_INODE_ITEM_KEY;
971 location->offset = 0;
972 return 0;
973 }
974 path = btrfs_alloc_path();
975 BUG_ON(!path);
976
977 if (namelen == 2 && strcmp(name, "..") == 0) {
978 struct btrfs_key key;
979 struct extent_buffer *leaf;
980 u32 nritems;
981 int slot;
982
983 key.objectid = dir->i_ino;
984 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
985 key.offset = 0;
986 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
987 BUG_ON(ret == 0);
988 ret = 0;
989
990 leaf = path->nodes[0];
991 slot = path->slots[0];
992 nritems = btrfs_header_nritems(leaf);
993 if (slot >= nritems)
994 goto out_err;
995
996 btrfs_item_key_to_cpu(leaf, &key, slot);
997 if (key.objectid != dir->i_ino ||
998 key.type != BTRFS_INODE_REF_KEY) {
999 goto out_err;
1000 }
1001 location->objectid = key.offset;
1002 location->type = BTRFS_INODE_ITEM_KEY;
1003 location->offset = 0;
1004 goto out;
1005 }
1006
1007 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1008 namelen, 0);
1009 if (IS_ERR(di))
1010 ret = PTR_ERR(di);
1011 if (!di || IS_ERR(di)) {
1012 goto out_err;
1013 }
1014 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1015 out:
1016 btrfs_free_path(path);
1017 return ret;
1018 out_err:
1019 location->objectid = 0;
1020 goto out;
1021 }
1022
1023 /*
1024 * when we hit a tree root in a directory, the btrfs part of the inode
1025 * needs to be changed to reflect the root directory of the tree root. This
1026 * is kind of like crossing a mount point.
1027 */
1028 static int fixup_tree_root_location(struct btrfs_root *root,
1029 struct btrfs_key *location,
1030 struct btrfs_root **sub_root,
1031 struct dentry *dentry)
1032 {
1033 struct btrfs_path *path;
1034 struct btrfs_root_item *ri;
1035
1036 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1037 return 0;
1038 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1039 return 0;
1040
1041 path = btrfs_alloc_path();
1042 BUG_ON(!path);
1043 mutex_lock(&root->fs_info->fs_mutex);
1044
1045 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1046 dentry->d_name.name,
1047 dentry->d_name.len);
1048 if (IS_ERR(*sub_root))
1049 return PTR_ERR(*sub_root);
1050
1051 ri = &(*sub_root)->root_item;
1052 location->objectid = btrfs_root_dirid(ri);
1053 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1054 location->offset = 0;
1055
1056 btrfs_free_path(path);
1057 mutex_unlock(&root->fs_info->fs_mutex);
1058 return 0;
1059 }
1060
1061 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1062 {
1063 struct btrfs_iget_args *args = p;
1064 inode->i_ino = args->ino;
1065 BTRFS_I(inode)->root = args->root;
1066 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1067 inode->i_mapping, GFP_NOFS);
1068 return 0;
1069 }
1070
1071 static int btrfs_find_actor(struct inode *inode, void *opaque)
1072 {
1073 struct btrfs_iget_args *args = opaque;
1074 return (args->ino == inode->i_ino &&
1075 args->root == BTRFS_I(inode)->root);
1076 }
1077
1078 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1079 struct btrfs_root *root)
1080 {
1081 struct inode *inode;
1082 struct btrfs_iget_args args;
1083 args.ino = objectid;
1084 args.root = root;
1085
1086 inode = iget5_locked(s, objectid, btrfs_find_actor,
1087 btrfs_init_locked_inode,
1088 (void *)&args);
1089 return inode;
1090 }
1091
1092 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1093 struct nameidata *nd)
1094 {
1095 struct inode * inode;
1096 struct btrfs_inode *bi = BTRFS_I(dir);
1097 struct btrfs_root *root = bi->root;
1098 struct btrfs_root *sub_root = root;
1099 struct btrfs_key location;
1100 int ret;
1101
1102 if (dentry->d_name.len > BTRFS_NAME_LEN)
1103 return ERR_PTR(-ENAMETOOLONG);
1104
1105 mutex_lock(&root->fs_info->fs_mutex);
1106 ret = btrfs_inode_by_name(dir, dentry, &location);
1107 mutex_unlock(&root->fs_info->fs_mutex);
1108
1109 if (ret < 0)
1110 return ERR_PTR(ret);
1111
1112 inode = NULL;
1113 if (location.objectid) {
1114 ret = fixup_tree_root_location(root, &location, &sub_root,
1115 dentry);
1116 if (ret < 0)
1117 return ERR_PTR(ret);
1118 if (ret > 0)
1119 return ERR_PTR(-ENOENT);
1120 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1121 sub_root);
1122 if (!inode)
1123 return ERR_PTR(-EACCES);
1124 if (inode->i_state & I_NEW) {
1125 /* the inode and parent dir are two different roots */
1126 if (sub_root != root) {
1127 igrab(inode);
1128 sub_root->inode = inode;
1129 }
1130 BTRFS_I(inode)->root = sub_root;
1131 memcpy(&BTRFS_I(inode)->location, &location,
1132 sizeof(location));
1133 btrfs_read_locked_inode(inode);
1134 unlock_new_inode(inode);
1135 }
1136 }
1137 return d_splice_alias(inode, dentry);
1138 }
1139
1140 static unsigned char btrfs_filetype_table[] = {
1141 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1142 };
1143
1144 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1145 {
1146 struct inode *inode = filp->f_dentry->d_inode;
1147 struct btrfs_root *root = BTRFS_I(inode)->root;
1148 struct btrfs_item *item;
1149 struct btrfs_dir_item *di;
1150 struct btrfs_key key;
1151 struct btrfs_key found_key;
1152 struct btrfs_path *path;
1153 int ret;
1154 u32 nritems;
1155 struct extent_buffer *leaf;
1156 int slot;
1157 int advance;
1158 unsigned char d_type;
1159 int over = 0;
1160 u32 di_cur;
1161 u32 di_total;
1162 u32 di_len;
1163 int key_type = BTRFS_DIR_INDEX_KEY;
1164 char tmp_name[32];
1165 char *name_ptr;
1166 int name_len;
1167
1168 /* FIXME, use a real flag for deciding about the key type */
1169 if (root->fs_info->tree_root == root)
1170 key_type = BTRFS_DIR_ITEM_KEY;
1171
1172 /* special case for "." */
1173 if (filp->f_pos == 0) {
1174 over = filldir(dirent, ".", 1,
1175 1, inode->i_ino,
1176 DT_DIR);
1177 if (over)
1178 return 0;
1179 filp->f_pos = 1;
1180 }
1181
1182 mutex_lock(&root->fs_info->fs_mutex);
1183 key.objectid = inode->i_ino;
1184 path = btrfs_alloc_path();
1185 path->reada = 2;
1186
1187 /* special case for .., just use the back ref */
1188 if (filp->f_pos == 1) {
1189 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1190 key.offset = 0;
1191 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1192 BUG_ON(ret == 0);
1193 leaf = path->nodes[0];
1194 slot = path->slots[0];
1195 nritems = btrfs_header_nritems(leaf);
1196 if (slot >= nritems) {
1197 btrfs_release_path(root, path);
1198 goto read_dir_items;
1199 }
1200 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1201 btrfs_release_path(root, path);
1202 if (found_key.objectid != key.objectid ||
1203 found_key.type != BTRFS_INODE_REF_KEY)
1204 goto read_dir_items;
1205 over = filldir(dirent, "..", 2,
1206 2, found_key.offset, DT_DIR);
1207 if (over)
1208 goto nopos;
1209 filp->f_pos = 2;
1210 }
1211
1212 read_dir_items:
1213 btrfs_set_key_type(&key, key_type);
1214 key.offset = filp->f_pos;
1215
1216 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1217 if (ret < 0)
1218 goto err;
1219 advance = 0;
1220 while(1) {
1221 leaf = path->nodes[0];
1222 nritems = btrfs_header_nritems(leaf);
1223 slot = path->slots[0];
1224 if (advance || slot >= nritems) {
1225 if (slot >= nritems -1) {
1226 ret = btrfs_next_leaf(root, path);
1227 if (ret)
1228 break;
1229 leaf = path->nodes[0];
1230 nritems = btrfs_header_nritems(leaf);
1231 slot = path->slots[0];
1232 } else {
1233 slot++;
1234 path->slots[0]++;
1235 }
1236 }
1237 advance = 1;
1238 item = btrfs_item_nr(leaf, slot);
1239 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1240
1241 if (found_key.objectid != key.objectid)
1242 break;
1243 if (btrfs_key_type(&found_key) != key_type)
1244 break;
1245 if (found_key.offset < filp->f_pos)
1246 continue;
1247
1248 filp->f_pos = found_key.offset;
1249 advance = 1;
1250 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1251 di_cur = 0;
1252 di_total = btrfs_item_size(leaf, item);
1253 while(di_cur < di_total) {
1254 struct btrfs_key location;
1255
1256 name_len = btrfs_dir_name_len(leaf, di);
1257 if (name_len < 32) {
1258 name_ptr = tmp_name;
1259 } else {
1260 name_ptr = kmalloc(name_len, GFP_NOFS);
1261 BUG_ON(!name_ptr);
1262 }
1263 read_extent_buffer(leaf, name_ptr,
1264 (unsigned long)(di + 1), name_len);
1265
1266 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1267 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1268
1269 over = filldir(dirent, name_ptr, name_len,
1270 found_key.offset,
1271 location.objectid,
1272 d_type);
1273
1274 if (name_ptr != tmp_name)
1275 kfree(name_ptr);
1276
1277 if (over)
1278 goto nopos;
1279 di_len = btrfs_dir_name_len(leaf, di) +
1280 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1281 di_cur += di_len;
1282 di = (struct btrfs_dir_item *)((char *)di + di_len);
1283 }
1284 }
1285 filp->f_pos++;
1286 nopos:
1287 ret = 0;
1288 err:
1289 btrfs_release_path(root, path);
1290 btrfs_free_path(path);
1291 mutex_unlock(&root->fs_info->fs_mutex);
1292 return ret;
1293 }
1294
1295 int btrfs_write_inode(struct inode *inode, int wait)
1296 {
1297 struct btrfs_root *root = BTRFS_I(inode)->root;
1298 struct btrfs_trans_handle *trans;
1299 int ret = 0;
1300
1301 if (wait) {
1302 mutex_lock(&root->fs_info->fs_mutex);
1303 trans = btrfs_start_transaction(root, 1);
1304 btrfs_set_trans_block_group(trans, inode);
1305 ret = btrfs_commit_transaction(trans, root);
1306 mutex_unlock(&root->fs_info->fs_mutex);
1307 }
1308 return ret;
1309 }
1310
1311 /*
1312 * This is somewhat expensive, updating the tree every time the
1313 * inode changes. But, it is most likely to find the inode in cache.
1314 * FIXME, needs more benchmarking...there are no reasons other than performance
1315 * to keep or drop this code.
1316 */
1317 void btrfs_dirty_inode(struct inode *inode)
1318 {
1319 struct btrfs_root *root = BTRFS_I(inode)->root;
1320 struct btrfs_trans_handle *trans;
1321
1322 mutex_lock(&root->fs_info->fs_mutex);
1323 trans = btrfs_start_transaction(root, 1);
1324 btrfs_set_trans_block_group(trans, inode);
1325 btrfs_update_inode(trans, root, inode);
1326 btrfs_end_transaction(trans, root);
1327 mutex_unlock(&root->fs_info->fs_mutex);
1328 }
1329
1330 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1331 struct btrfs_root *root,
1332 u64 objectid,
1333 struct btrfs_block_group_cache *group,
1334 int mode)
1335 {
1336 struct inode *inode;
1337 struct btrfs_inode_item *inode_item;
1338 struct btrfs_key *location;
1339 struct btrfs_path *path;
1340 int ret;
1341 int owner;
1342
1343 path = btrfs_alloc_path();
1344 BUG_ON(!path);
1345
1346 inode = new_inode(root->fs_info->sb);
1347 if (!inode)
1348 return ERR_PTR(-ENOMEM);
1349
1350 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1351 inode->i_mapping, GFP_NOFS);
1352 BTRFS_I(inode)->root = root;
1353
1354 if (mode & S_IFDIR)
1355 owner = 0;
1356 else
1357 owner = 1;
1358 group = btrfs_find_block_group(root, group, 0, 0, owner);
1359 BTRFS_I(inode)->block_group = group;
1360
1361 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
1362 if (ret)
1363 goto fail;
1364
1365 inode->i_uid = current->fsuid;
1366 inode->i_gid = current->fsgid;
1367 inode->i_mode = mode;
1368 inode->i_ino = objectid;
1369 inode->i_blocks = 0;
1370 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1371 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1372 struct btrfs_inode_item);
1373 fill_inode_item(path->nodes[0], inode_item, inode);
1374 btrfs_mark_buffer_dirty(path->nodes[0]);
1375 btrfs_free_path(path);
1376
1377 location = &BTRFS_I(inode)->location;
1378 location->objectid = objectid;
1379 location->offset = 0;
1380 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1381
1382 insert_inode_hash(inode);
1383 return inode;
1384 fail:
1385 btrfs_free_path(path);
1386 return ERR_PTR(ret);
1387 }
1388
1389 static inline u8 btrfs_inode_type(struct inode *inode)
1390 {
1391 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1392 }
1393
1394 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1395 struct dentry *dentry, struct inode *inode)
1396 {
1397 int ret;
1398 struct btrfs_key key;
1399 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1400 struct inode *parent_inode;
1401
1402 key.objectid = inode->i_ino;
1403 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1404 key.offset = 0;
1405
1406 ret = btrfs_insert_dir_item(trans, root,
1407 dentry->d_name.name, dentry->d_name.len,
1408 dentry->d_parent->d_inode->i_ino,
1409 &key, btrfs_inode_type(inode));
1410 if (ret == 0) {
1411 ret = btrfs_insert_inode_ref(trans, root,
1412 dentry->d_name.name,
1413 dentry->d_name.len,
1414 inode->i_ino,
1415 dentry->d_parent->d_inode->i_ino);
1416 parent_inode = dentry->d_parent->d_inode;
1417 parent_inode->i_size += dentry->d_name.len * 2;
1418 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1419 ret = btrfs_update_inode(trans, root,
1420 dentry->d_parent->d_inode);
1421 }
1422 return ret;
1423 }
1424
1425 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1426 struct dentry *dentry, struct inode *inode)
1427 {
1428 int err = btrfs_add_link(trans, dentry, inode);
1429 if (!err) {
1430 d_instantiate(dentry, inode);
1431 return 0;
1432 }
1433 if (err > 0)
1434 err = -EEXIST;
1435 return err;
1436 }
1437
1438 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1439 int mode, dev_t rdev)
1440 {
1441 struct btrfs_trans_handle *trans;
1442 struct btrfs_root *root = BTRFS_I(dir)->root;
1443 struct inode *inode;
1444 int err;
1445 int drop_inode = 0;
1446 u64 objectid;
1447 unsigned long nr;
1448
1449 if (!new_valid_dev(rdev))
1450 return -EINVAL;
1451
1452 mutex_lock(&root->fs_info->fs_mutex);
1453 trans = btrfs_start_transaction(root, 1);
1454 btrfs_set_trans_block_group(trans, dir);
1455
1456 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1457 if (err) {
1458 err = -ENOSPC;
1459 goto out_unlock;
1460 }
1461
1462 inode = btrfs_new_inode(trans, root, objectid,
1463 BTRFS_I(dir)->block_group, mode);
1464 err = PTR_ERR(inode);
1465 if (IS_ERR(inode))
1466 goto out_unlock;
1467
1468 btrfs_set_trans_block_group(trans, inode);
1469 err = btrfs_add_nondir(trans, dentry, inode);
1470 if (err)
1471 drop_inode = 1;
1472 else {
1473 inode->i_op = &btrfs_special_inode_operations;
1474 init_special_inode(inode, inode->i_mode, rdev);
1475 btrfs_update_inode(trans, root, inode);
1476 }
1477 dir->i_sb->s_dirt = 1;
1478 btrfs_update_inode_block_group(trans, inode);
1479 btrfs_update_inode_block_group(trans, dir);
1480 out_unlock:
1481 nr = trans->blocks_used;
1482 btrfs_end_transaction(trans, root);
1483 mutex_unlock(&root->fs_info->fs_mutex);
1484
1485 if (drop_inode) {
1486 inode_dec_link_count(inode);
1487 iput(inode);
1488 }
1489 btrfs_btree_balance_dirty(root, nr);
1490 return err;
1491 }
1492
1493 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1494 int mode, struct nameidata *nd)
1495 {
1496 struct btrfs_trans_handle *trans;
1497 struct btrfs_root *root = BTRFS_I(dir)->root;
1498 struct inode *inode;
1499 int err;
1500 int drop_inode = 0;
1501 unsigned long nr;
1502 u64 objectid;
1503
1504 mutex_lock(&root->fs_info->fs_mutex);
1505 trans = btrfs_start_transaction(root, 1);
1506 btrfs_set_trans_block_group(trans, dir);
1507
1508 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1509 if (err) {
1510 err = -ENOSPC;
1511 goto out_unlock;
1512 }
1513
1514 inode = btrfs_new_inode(trans, root, objectid,
1515 BTRFS_I(dir)->block_group, mode);
1516 err = PTR_ERR(inode);
1517 if (IS_ERR(inode))
1518 goto out_unlock;
1519
1520 btrfs_set_trans_block_group(trans, inode);
1521 err = btrfs_add_nondir(trans, dentry, inode);
1522 if (err)
1523 drop_inode = 1;
1524 else {
1525 inode->i_mapping->a_ops = &btrfs_aops;
1526 inode->i_fop = &btrfs_file_operations;
1527 inode->i_op = &btrfs_file_inode_operations;
1528 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1529 inode->i_mapping, GFP_NOFS);
1530 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
1531 }
1532 dir->i_sb->s_dirt = 1;
1533 btrfs_update_inode_block_group(trans, inode);
1534 btrfs_update_inode_block_group(trans, dir);
1535 out_unlock:
1536 nr = trans->blocks_used;
1537 btrfs_end_transaction(trans, root);
1538 mutex_unlock(&root->fs_info->fs_mutex);
1539
1540 if (drop_inode) {
1541 inode_dec_link_count(inode);
1542 iput(inode);
1543 }
1544 btrfs_btree_balance_dirty(root, nr);
1545 return err;
1546 }
1547
1548 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1549 struct dentry *dentry)
1550 {
1551 struct btrfs_trans_handle *trans;
1552 struct btrfs_root *root = BTRFS_I(dir)->root;
1553 struct inode *inode = old_dentry->d_inode;
1554 unsigned long nr;
1555 int err;
1556 int drop_inode = 0;
1557
1558 if (inode->i_nlink == 0)
1559 return -ENOENT;
1560
1561 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1562 inode->i_nlink++;
1563 #else
1564 inc_nlink(inode);
1565 #endif
1566 mutex_lock(&root->fs_info->fs_mutex);
1567 trans = btrfs_start_transaction(root, 1);
1568
1569 btrfs_set_trans_block_group(trans, dir);
1570 atomic_inc(&inode->i_count);
1571 err = btrfs_add_nondir(trans, dentry, inode);
1572
1573 if (err)
1574 drop_inode = 1;
1575
1576 dir->i_sb->s_dirt = 1;
1577 btrfs_update_inode_block_group(trans, dir);
1578 err = btrfs_update_inode(trans, root, inode);
1579
1580 if (err)
1581 drop_inode = 1;
1582
1583 nr = trans->blocks_used;
1584 btrfs_end_transaction(trans, root);
1585 mutex_unlock(&root->fs_info->fs_mutex);
1586
1587 if (drop_inode) {
1588 inode_dec_link_count(inode);
1589 iput(inode);
1590 }
1591 btrfs_btree_balance_dirty(root, nr);
1592 return err;
1593 }
1594
1595 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1596 {
1597 struct inode *inode;
1598 struct btrfs_trans_handle *trans;
1599 struct btrfs_root *root = BTRFS_I(dir)->root;
1600 int err = 0;
1601 int drop_on_err = 0;
1602 u64 objectid;
1603 unsigned long nr = 1;
1604
1605 mutex_lock(&root->fs_info->fs_mutex);
1606 trans = btrfs_start_transaction(root, 1);
1607 btrfs_set_trans_block_group(trans, dir);
1608
1609 if (IS_ERR(trans)) {
1610 err = PTR_ERR(trans);
1611 goto out_unlock;
1612 }
1613
1614 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1615 if (err) {
1616 err = -ENOSPC;
1617 goto out_unlock;
1618 }
1619
1620 inode = btrfs_new_inode(trans, root, objectid,
1621 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1622 if (IS_ERR(inode)) {
1623 err = PTR_ERR(inode);
1624 goto out_fail;
1625 }
1626
1627 drop_on_err = 1;
1628 inode->i_op = &btrfs_dir_inode_operations;
1629 inode->i_fop = &btrfs_dir_file_operations;
1630 btrfs_set_trans_block_group(trans, inode);
1631
1632 inode->i_size = 0;
1633 err = btrfs_update_inode(trans, root, inode);
1634 if (err)
1635 goto out_fail;
1636
1637 err = btrfs_add_link(trans, dentry, inode);
1638 if (err)
1639 goto out_fail;
1640
1641 d_instantiate(dentry, inode);
1642 drop_on_err = 0;
1643 dir->i_sb->s_dirt = 1;
1644 btrfs_update_inode_block_group(trans, inode);
1645 btrfs_update_inode_block_group(trans, dir);
1646
1647 out_fail:
1648 nr = trans->blocks_used;
1649 btrfs_end_transaction(trans, root);
1650
1651 out_unlock:
1652 mutex_unlock(&root->fs_info->fs_mutex);
1653 if (drop_on_err)
1654 iput(inode);
1655 btrfs_btree_balance_dirty(root, nr);
1656 return err;
1657 }
1658
1659 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1660 size_t page_offset, u64 start, u64 end,
1661 int create)
1662 {
1663 int ret;
1664 int err = 0;
1665 u64 bytenr;
1666 u64 extent_start = 0;
1667 u64 extent_end = 0;
1668 u64 objectid = inode->i_ino;
1669 u32 found_type;
1670 int failed_insert = 0;
1671 struct btrfs_path *path;
1672 struct btrfs_root *root = BTRFS_I(inode)->root;
1673 struct btrfs_file_extent_item *item;
1674 struct extent_buffer *leaf;
1675 struct btrfs_key found_key;
1676 struct extent_map *em = NULL;
1677 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1678 struct btrfs_trans_handle *trans = NULL;
1679
1680 path = btrfs_alloc_path();
1681 BUG_ON(!path);
1682 mutex_lock(&root->fs_info->fs_mutex);
1683
1684 again:
1685 em = lookup_extent_mapping(em_tree, start, end);
1686 if (em) {
1687 goto out;
1688 }
1689 if (!em) {
1690 em = alloc_extent_map(GFP_NOFS);
1691 if (!em) {
1692 err = -ENOMEM;
1693 goto out;
1694 }
1695 em->start = EXTENT_MAP_HOLE;
1696 em->end = EXTENT_MAP_HOLE;
1697 }
1698 em->bdev = inode->i_sb->s_bdev;
1699 ret = btrfs_lookup_file_extent(trans, root, path,
1700 objectid, start, trans != NULL);
1701 if (ret < 0) {
1702 err = ret;
1703 goto out;
1704 }
1705
1706 if (ret != 0) {
1707 if (path->slots[0] == 0)
1708 goto not_found;
1709 path->slots[0]--;
1710 }
1711
1712 leaf = path->nodes[0];
1713 item = btrfs_item_ptr(leaf, path->slots[0],
1714 struct btrfs_file_extent_item);
1715 /* are we inside the extent that was found? */
1716 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1717 found_type = btrfs_key_type(&found_key);
1718 if (found_key.objectid != objectid ||
1719 found_type != BTRFS_EXTENT_DATA_KEY) {
1720 goto not_found;
1721 }
1722
1723 found_type = btrfs_file_extent_type(leaf, item);
1724 extent_start = found_key.offset;
1725 if (found_type == BTRFS_FILE_EXTENT_REG) {
1726 extent_end = extent_start +
1727 btrfs_file_extent_num_bytes(leaf, item);
1728 err = 0;
1729 if (start < extent_start || start >= extent_end) {
1730 em->start = start;
1731 if (start < extent_start) {
1732 if (end < extent_start)
1733 goto not_found;
1734 em->end = extent_end - 1;
1735 } else {
1736 em->end = end;
1737 }
1738 goto not_found_em;
1739 }
1740 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1741 if (bytenr == 0) {
1742 em->start = extent_start;
1743 em->end = extent_end - 1;
1744 em->block_start = EXTENT_MAP_HOLE;
1745 em->block_end = EXTENT_MAP_HOLE;
1746 goto insert;
1747 }
1748 bytenr += btrfs_file_extent_offset(leaf, item);
1749 em->block_start = bytenr;
1750 em->block_end = em->block_start +
1751 btrfs_file_extent_num_bytes(leaf, item) - 1;
1752 em->start = extent_start;
1753 em->end = extent_end - 1;
1754 goto insert;
1755 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1756 unsigned long ptr;
1757 char *map;
1758 size_t size;
1759 size_t extent_offset;
1760 size_t copy_size;
1761
1762 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
1763 path->slots[0]));
1764 extent_end = (extent_start + size - 1) |
1765 ((u64)root->sectorsize - 1);
1766 if (start < extent_start || start >= extent_end) {
1767 em->start = start;
1768 if (start < extent_start) {
1769 if (end < extent_start)
1770 goto not_found;
1771 em->end = extent_end;
1772 } else {
1773 em->end = end;
1774 }
1775 goto not_found_em;
1776 }
1777 em->block_start = EXTENT_MAP_INLINE;
1778 em->block_end = EXTENT_MAP_INLINE;
1779
1780 if (!page) {
1781 em->start = extent_start;
1782 em->end = extent_start + size - 1;
1783 goto out;
1784 }
1785
1786 extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
1787 extent_start + page_offset;
1788 copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
1789 size - extent_offset);
1790 em->start = extent_start + extent_offset;
1791 em->end = (em->start + copy_size -1) |
1792 ((u64)root->sectorsize -1);
1793 map = kmap(page);
1794 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
1795 if (create == 0 && !PageUptodate(page)) {
1796 read_extent_buffer(leaf, map + page_offset, ptr,
1797 copy_size);
1798 flush_dcache_page(page);
1799 } else if (create && PageUptodate(page)) {
1800 if (!trans) {
1801 kunmap(page);
1802 free_extent_map(em);
1803 em = NULL;
1804 btrfs_release_path(root, path);
1805 trans = btrfs_start_transaction(root, 1);
1806 goto again;
1807 }
1808 write_extent_buffer(leaf, map + page_offset, ptr,
1809 copy_size);
1810 btrfs_mark_buffer_dirty(leaf);
1811 }
1812 kunmap(page);
1813 set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
1814 goto insert;
1815 } else {
1816 printk("unkknown found_type %d\n", found_type);
1817 WARN_ON(1);
1818 }
1819 not_found:
1820 em->start = start;
1821 em->end = end;
1822 not_found_em:
1823 em->block_start = EXTENT_MAP_HOLE;
1824 em->block_end = EXTENT_MAP_HOLE;
1825 insert:
1826 btrfs_release_path(root, path);
1827 if (em->start > start || em->end < start) {
1828 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
1829 err = -EIO;
1830 goto out;
1831 }
1832 ret = add_extent_mapping(em_tree, em);
1833 if (ret == -EEXIST) {
1834 free_extent_map(em);
1835 em = NULL;
1836 if (0 && failed_insert == 1) {
1837 btrfs_drop_extent_cache(inode, start, end);
1838 }
1839 failed_insert++;
1840 if (failed_insert > 5) {
1841 printk("failing to insert %Lu %Lu\n", start, end);
1842 err = -EIO;
1843 goto out;
1844 }
1845 goto again;
1846 }
1847 err = 0;
1848 out:
1849 btrfs_free_path(path);
1850 if (trans) {
1851 ret = btrfs_end_transaction(trans, root);
1852 if (!err)
1853 err = ret;
1854 }
1855 mutex_unlock(&root->fs_info->fs_mutex);
1856 if (err) {
1857 free_extent_map(em);
1858 WARN_ON(1);
1859 return ERR_PTR(err);
1860 }
1861 return em;
1862 }
1863
1864 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
1865 {
1866 return extent_bmap(mapping, iblock, btrfs_get_extent);
1867 }
1868
1869 static int btrfs_prepare_write(struct file *file, struct page *page,
1870 unsigned from, unsigned to)
1871 {
1872 return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree,
1873 page->mapping->host, page, from, to,
1874 btrfs_get_extent);
1875 }
1876
1877 int btrfs_readpage(struct file *file, struct page *page)
1878 {
1879 struct extent_map_tree *tree;
1880 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1881 return extent_read_full_page(tree, page, btrfs_get_extent);
1882 }
1883 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1884 {
1885 struct extent_map_tree *tree;
1886
1887
1888 if (current->flags & PF_MEMALLOC) {
1889 redirty_page_for_writepage(wbc, page);
1890 unlock_page(page);
1891 return 0;
1892 }
1893 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1894 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
1895 }
1896
1897 static int btrfs_writepages(struct address_space *mapping,
1898 struct writeback_control *wbc)
1899 {
1900 struct extent_map_tree *tree;
1901 tree = &BTRFS_I(mapping->host)->extent_tree;
1902 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
1903 }
1904
1905 static int
1906 btrfs_readpages(struct file *file, struct address_space *mapping,
1907 struct list_head *pages, unsigned nr_pages)
1908 {
1909 struct extent_map_tree *tree;
1910 tree = &BTRFS_I(mapping->host)->extent_tree;
1911 return extent_readpages(tree, mapping, pages, nr_pages,
1912 btrfs_get_extent);
1913 }
1914
1915 static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
1916 {
1917 struct extent_map_tree *tree;
1918 int ret;
1919
1920 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1921 ret = try_release_extent_mapping(tree, page);
1922 if (ret == 1) {
1923 ClearPagePrivate(page);
1924 set_page_private(page, 0);
1925 page_cache_release(page);
1926 }
1927 return ret;
1928 }
1929
1930 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
1931 {
1932 struct extent_map_tree *tree;
1933
1934 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1935 extent_invalidatepage(tree, page, offset);
1936 btrfs_releasepage(page, GFP_NOFS);
1937 }
1938
1939 /*
1940 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1941 * called from a page fault handler when a page is first dirtied. Hence we must
1942 * be careful to check for EOF conditions here. We set the page up correctly
1943 * for a written page which means we get ENOSPC checking when writing into
1944 * holes and correct delalloc and unwritten extent mapping on filesystems that
1945 * support these features.
1946 *
1947 * We are not allowed to take the i_mutex here so we have to play games to
1948 * protect against truncate races as the page could now be beyond EOF. Because
1949 * vmtruncate() writes the inode size before removing pages, once we have the
1950 * page lock we can determine safely if the page is beyond EOF. If it is not
1951 * beyond EOF, then the page is guaranteed safe against truncation until we
1952 * unlock the page.
1953 */
1954 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
1955 {
1956 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1957 unsigned long end;
1958 loff_t size;
1959 int ret = -EINVAL;
1960 u64 page_start;
1961
1962 down_read(&BTRFS_I(inode)->root->snap_sem);
1963 lock_page(page);
1964 wait_on_page_writeback(page);
1965 size = i_size_read(inode);
1966 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1967
1968 if ((page->mapping != inode->i_mapping) ||
1969 (page_start > size)) {
1970 /* page got truncated out from underneath us */
1971 goto out_unlock;
1972 }
1973
1974 /* page is wholly or partially inside EOF */
1975 if (page_start + PAGE_CACHE_SIZE > size)
1976 end = size & ~PAGE_CACHE_MASK;
1977 else
1978 end = PAGE_CACHE_SIZE;
1979
1980 ret = btrfs_cow_one_page(inode, page, end);
1981
1982 out_unlock:
1983 up_read(&BTRFS_I(inode)->root->snap_sem);
1984 unlock_page(page);
1985 return ret;
1986 }
1987
1988 static void btrfs_truncate(struct inode *inode)
1989 {
1990 struct btrfs_root *root = BTRFS_I(inode)->root;
1991 int ret;
1992 struct btrfs_trans_handle *trans;
1993 unsigned long nr;
1994
1995 if (!S_ISREG(inode->i_mode))
1996 return;
1997 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1998 return;
1999
2000 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2001
2002 mutex_lock(&root->fs_info->fs_mutex);
2003 trans = btrfs_start_transaction(root, 1);
2004 btrfs_set_trans_block_group(trans, inode);
2005
2006 /* FIXME, add redo link to tree so we don't leak on crash */
2007 ret = btrfs_truncate_in_trans(trans, root, inode);
2008 btrfs_update_inode(trans, root, inode);
2009 nr = trans->blocks_used;
2010
2011 ret = btrfs_end_transaction(trans, root);
2012 BUG_ON(ret);
2013 mutex_unlock(&root->fs_info->fs_mutex);
2014 btrfs_btree_balance_dirty(root, nr);
2015 }
2016
2017 int btrfs_commit_write(struct file *file, struct page *page,
2018 unsigned from, unsigned to)
2019 {
2020 loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
2021 struct inode *inode = page->mapping->host;
2022
2023 btrfs_cow_one_page(inode, page, PAGE_CACHE_SIZE);
2024
2025 if (pos > inode->i_size) {
2026 i_size_write(inode, pos);
2027 mark_inode_dirty(inode);
2028 }
2029 return 0;
2030 }
2031
2032 static int create_subvol(struct btrfs_root *root, char *name, int namelen)
2033 {
2034 struct btrfs_trans_handle *trans;
2035 struct btrfs_key key;
2036 struct btrfs_root_item root_item;
2037 struct btrfs_inode_item *inode_item;
2038 struct extent_buffer *leaf;
2039 struct btrfs_root *new_root;
2040 struct inode *inode;
2041 struct inode *dir;
2042 int ret;
2043 int err;
2044 u64 objectid;
2045 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2046 unsigned long nr = 1;
2047
2048 mutex_lock(&root->fs_info->fs_mutex);
2049 trans = btrfs_start_transaction(root, 1);
2050 BUG_ON(!trans);
2051
2052 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2053 0, &objectid);
2054 if (ret)
2055 goto fail;
2056
2057 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2058 objectid, trans->transid, 0, 0,
2059 0, 0);
2060 if (IS_ERR(leaf))
2061 return PTR_ERR(leaf);
2062
2063 btrfs_set_header_nritems(leaf, 0);
2064 btrfs_set_header_level(leaf, 0);
2065 btrfs_set_header_bytenr(leaf, leaf->start);
2066 btrfs_set_header_generation(leaf, trans->transid);
2067 btrfs_set_header_owner(leaf, objectid);
2068
2069 write_extent_buffer(leaf, root->fs_info->fsid,
2070 (unsigned long)btrfs_header_fsid(leaf),
2071 BTRFS_FSID_SIZE);
2072 btrfs_mark_buffer_dirty(leaf);
2073
2074 inode_item = &root_item.inode;
2075 memset(inode_item, 0, sizeof(*inode_item));
2076 inode_item->generation = cpu_to_le64(1);
2077 inode_item->size = cpu_to_le64(3);
2078 inode_item->nlink = cpu_to_le32(1);
2079 inode_item->nblocks = cpu_to_le64(1);
2080 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2081
2082 btrfs_set_root_bytenr(&root_item, leaf->start);
2083 btrfs_set_root_level(&root_item, 0);
2084 btrfs_set_root_refs(&root_item, 1);
2085 btrfs_set_root_used(&root_item, 0);
2086
2087 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2088 root_item.drop_level = 0;
2089
2090 free_extent_buffer(leaf);
2091 leaf = NULL;
2092
2093 btrfs_set_root_dirid(&root_item, new_dirid);
2094
2095 key.objectid = objectid;
2096 key.offset = 1;
2097 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2098 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2099 &root_item);
2100 if (ret)
2101 goto fail;
2102
2103 /*
2104 * insert the directory item
2105 */
2106 key.offset = (u64)-1;
2107 dir = root->fs_info->sb->s_root->d_inode;
2108 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2109 name, namelen, dir->i_ino, &key,
2110 BTRFS_FT_DIR);
2111 if (ret)
2112 goto fail;
2113
2114 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2115 name, namelen, objectid,
2116 root->fs_info->sb->s_root->d_inode->i_ino);
2117 if (ret)
2118 goto fail;
2119
2120 ret = btrfs_commit_transaction(trans, root);
2121 if (ret)
2122 goto fail_commit;
2123
2124 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2125 BUG_ON(!new_root);
2126
2127 trans = btrfs_start_transaction(new_root, 1);
2128 BUG_ON(!trans);
2129
2130 inode = btrfs_new_inode(trans, new_root, new_dirid,
2131 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2132 if (IS_ERR(inode))
2133 goto fail;
2134 inode->i_op = &btrfs_dir_inode_operations;
2135 inode->i_fop = &btrfs_dir_file_operations;
2136 new_root->inode = inode;
2137
2138 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2139 new_dirid);
2140 inode->i_nlink = 1;
2141 inode->i_size = 0;
2142 ret = btrfs_update_inode(trans, new_root, inode);
2143 if (ret)
2144 goto fail;
2145 fail:
2146 nr = trans->blocks_used;
2147 err = btrfs_commit_transaction(trans, root);
2148 if (err && !ret)
2149 ret = err;
2150 fail_commit:
2151 mutex_unlock(&root->fs_info->fs_mutex);
2152 btrfs_btree_balance_dirty(root, nr);
2153 return ret;
2154 }
2155
2156 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2157 {
2158 struct btrfs_trans_handle *trans;
2159 struct btrfs_key key;
2160 struct btrfs_root_item new_root_item;
2161 struct extent_buffer *tmp;
2162 int ret;
2163 int err;
2164 u64 objectid;
2165 unsigned long nr;
2166
2167 if (!root->ref_cows)
2168 return -EINVAL;
2169
2170 down_write(&root->snap_sem);
2171 freeze_bdev(root->fs_info->sb->s_bdev);
2172 thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb);
2173
2174 mutex_lock(&root->fs_info->fs_mutex);
2175 trans = btrfs_start_transaction(root, 1);
2176 BUG_ON(!trans);
2177
2178 ret = btrfs_update_inode(trans, root, root->inode);
2179 if (ret)
2180 goto fail;
2181
2182 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2183 0, &objectid);
2184 if (ret)
2185 goto fail;
2186
2187 memcpy(&new_root_item, &root->root_item,
2188 sizeof(new_root_item));
2189
2190 key.objectid = objectid;
2191 key.offset = 1;
2192 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2193
2194 extent_buffer_get(root->node);
2195 btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
2196 free_extent_buffer(tmp);
2197
2198 btrfs_copy_root(trans, root, root->node, &tmp, objectid);
2199
2200 btrfs_set_root_bytenr(&new_root_item, tmp->start);
2201 btrfs_set_root_level(&new_root_item, btrfs_header_level(tmp));
2202 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2203 &new_root_item);
2204 free_extent_buffer(tmp);
2205 if (ret)
2206 goto fail;
2207
2208 /*
2209 * insert the directory item
2210 */
2211 key.offset = (u64)-1;
2212 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2213 name, namelen,
2214 root->fs_info->sb->s_root->d_inode->i_ino,
2215 &key, BTRFS_FT_DIR);
2216
2217 if (ret)
2218 goto fail;
2219
2220 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2221 name, namelen, objectid,
2222 root->fs_info->sb->s_root->d_inode->i_ino);
2223
2224 if (ret)
2225 goto fail;
2226 fail:
2227 nr = trans->blocks_used;
2228 err = btrfs_commit_transaction(trans, root);
2229
2230 if (err && !ret)
2231 ret = err;
2232
2233 mutex_unlock(&root->fs_info->fs_mutex);
2234 up_write(&root->snap_sem);
2235 btrfs_btree_balance_dirty(root, nr);
2236 return ret;
2237 }
2238
2239 static unsigned long force_ra(struct address_space *mapping,
2240 struct file_ra_state *ra, struct file *file,
2241 pgoff_t offset, pgoff_t last_index)
2242 {
2243 pgoff_t req_size;
2244
2245 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2246 req_size = last_index - offset + 1;
2247 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2248 return offset;
2249 #else
2250 req_size = min(last_index - offset + 1, (pgoff_t)128);
2251 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2252 return offset + req_size;
2253 #endif
2254 }
2255
2256 int btrfs_defrag_file(struct file *file) {
2257 struct inode *inode = fdentry(file)->d_inode;
2258 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2259 struct page *page;
2260 unsigned long last_index;
2261 unsigned long ra_index = 0;
2262 u64 page_start;
2263 u64 page_end;
2264 unsigned long i;
2265
2266 mutex_lock(&inode->i_mutex);
2267 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2268 for (i = 0; i <= last_index; i++) {
2269 if (i == ra_index) {
2270 ra_index = force_ra(inode->i_mapping, &file->f_ra,
2271 file, ra_index, last_index);
2272 }
2273 page = grab_cache_page(inode->i_mapping, i);
2274 if (!page)
2275 goto out_unlock;
2276 if (!PageUptodate(page)) {
2277 btrfs_readpage(NULL, page);
2278 lock_page(page);
2279 if (!PageUptodate(page)) {
2280 unlock_page(page);
2281 page_cache_release(page);
2282 goto out_unlock;
2283 }
2284 }
2285 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2286 page_end = page_start + PAGE_CACHE_SIZE - 1;
2287
2288 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
2289 set_extent_delalloc(em_tree, page_start,
2290 page_end, GFP_NOFS);
2291 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
2292 set_page_dirty(page);
2293 unlock_page(page);
2294 page_cache_release(page);
2295 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2296 }
2297
2298 out_unlock:
2299 mutex_unlock(&inode->i_mutex);
2300 return 0;
2301 }
2302
2303 static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
2304 {
2305 struct btrfs_ioctl_vol_args vol_args;
2306 struct btrfs_dir_item *di;
2307 struct btrfs_path *path;
2308 int namelen;
2309 u64 root_dirid;
2310
2311 if (copy_from_user(&vol_args, arg, sizeof(vol_args)))
2312 return -EFAULT;
2313
2314 namelen = strlen(vol_args.name);
2315 if (namelen > BTRFS_VOL_NAME_MAX)
2316 return -EINVAL;
2317 if (strchr(vol_args.name, '/'))
2318 return -EINVAL;
2319
2320 path = btrfs_alloc_path();
2321 if (!path)
2322 return -ENOMEM;
2323
2324 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2325 mutex_lock(&root->fs_info->fs_mutex);
2326 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2327 path, root_dirid,
2328 vol_args.name, namelen, 0);
2329 mutex_unlock(&root->fs_info->fs_mutex);
2330 btrfs_free_path(path);
2331 if (di && !IS_ERR(di))
2332 return -EEXIST;
2333 if (IS_ERR(di))
2334 return PTR_ERR(di);
2335
2336 if (root == root->fs_info->tree_root)
2337 return create_subvol(root, vol_args.name, namelen);
2338 return create_snapshot(root, vol_args.name, namelen);
2339 }
2340
2341 static int btrfs_ioctl_defrag(struct file *file)
2342 {
2343 struct inode *inode = fdentry(file)->d_inode;
2344 struct btrfs_root *root = BTRFS_I(inode)->root;
2345
2346 switch (inode->i_mode & S_IFMT) {
2347 case S_IFDIR:
2348 mutex_lock(&root->fs_info->fs_mutex);
2349 btrfs_defrag_root(root, 0);
2350 btrfs_defrag_root(root->fs_info->extent_root, 0);
2351 mutex_unlock(&root->fs_info->fs_mutex);
2352 break;
2353 case S_IFREG:
2354 btrfs_defrag_file(file);
2355 break;
2356 }
2357
2358 return 0;
2359 }
2360
2361 long btrfs_ioctl(struct file *file, unsigned int
2362 cmd, unsigned long arg)
2363 {
2364 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
2365
2366 switch (cmd) {
2367 case BTRFS_IOC_SNAP_CREATE:
2368 return btrfs_ioctl_snap_create(root, (void __user *)arg);
2369 case BTRFS_IOC_DEFRAG:
2370 return btrfs_ioctl_defrag(file);
2371 }
2372
2373 return -ENOTTY;
2374 }
2375
2376 /*
2377 * Called inside transaction, so use GFP_NOFS
2378 */
2379 struct inode *btrfs_alloc_inode(struct super_block *sb)
2380 {
2381 struct btrfs_inode *ei;
2382
2383 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2384 if (!ei)
2385 return NULL;
2386 ei->last_trans = 0;
2387 return &ei->vfs_inode;
2388 }
2389
2390 void btrfs_destroy_inode(struct inode *inode)
2391 {
2392 WARN_ON(!list_empty(&inode->i_dentry));
2393 WARN_ON(inode->i_data.nrpages);
2394
2395 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2396 }
2397
2398 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2399 static void init_once(struct kmem_cache * cachep, void *foo)
2400 #else
2401 static void init_once(void * foo, struct kmem_cache * cachep,
2402 unsigned long flags)
2403 #endif
2404 {
2405 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2406
2407 inode_init_once(&ei->vfs_inode);
2408 }
2409
2410 void btrfs_destroy_cachep(void)
2411 {
2412 if (btrfs_inode_cachep)
2413 kmem_cache_destroy(btrfs_inode_cachep);
2414 if (btrfs_trans_handle_cachep)
2415 kmem_cache_destroy(btrfs_trans_handle_cachep);
2416 if (btrfs_transaction_cachep)
2417 kmem_cache_destroy(btrfs_transaction_cachep);
2418 if (btrfs_bit_radix_cachep)
2419 kmem_cache_destroy(btrfs_bit_radix_cachep);
2420 if (btrfs_path_cachep)
2421 kmem_cache_destroy(btrfs_path_cachep);
2422 }
2423
2424 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
2425 unsigned long extra_flags,
2426 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2427 void (*ctor)(struct kmem_cache *, void *)
2428 #else
2429 void (*ctor)(void *, struct kmem_cache *,
2430 unsigned long)
2431 #endif
2432 )
2433 {
2434 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2435 SLAB_MEM_SPREAD | extra_flags), ctor
2436 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2437 ,NULL
2438 #endif
2439 );
2440 }
2441
2442 int btrfs_init_cachep(void)
2443 {
2444 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
2445 sizeof(struct btrfs_inode),
2446 0, init_once);
2447 if (!btrfs_inode_cachep)
2448 goto fail;
2449 btrfs_trans_handle_cachep =
2450 btrfs_cache_create("btrfs_trans_handle_cache",
2451 sizeof(struct btrfs_trans_handle),
2452 0, NULL);
2453 if (!btrfs_trans_handle_cachep)
2454 goto fail;
2455 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
2456 sizeof(struct btrfs_transaction),
2457 0, NULL);
2458 if (!btrfs_transaction_cachep)
2459 goto fail;
2460 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
2461 sizeof(struct btrfs_path),
2462 0, NULL);
2463 if (!btrfs_path_cachep)
2464 goto fail;
2465 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
2466 SLAB_DESTROY_BY_RCU, NULL);
2467 if (!btrfs_bit_radix_cachep)
2468 goto fail;
2469 return 0;
2470 fail:
2471 btrfs_destroy_cachep();
2472 return -ENOMEM;
2473 }
2474
2475 static int btrfs_getattr(struct vfsmount *mnt,
2476 struct dentry *dentry, struct kstat *stat)
2477 {
2478 struct inode *inode = dentry->d_inode;
2479 generic_fillattr(inode, stat);
2480 stat->blksize = 256 * 1024;
2481 return 0;
2482 }
2483
2484 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2485 struct inode * new_dir,struct dentry *new_dentry)
2486 {
2487 struct btrfs_trans_handle *trans;
2488 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2489 struct inode *new_inode = new_dentry->d_inode;
2490 struct inode *old_inode = old_dentry->d_inode;
2491 struct timespec ctime = CURRENT_TIME;
2492 struct btrfs_path *path;
2493 int ret;
2494
2495 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2496 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2497 return -ENOTEMPTY;
2498 }
2499
2500 mutex_lock(&root->fs_info->fs_mutex);
2501 trans = btrfs_start_transaction(root, 1);
2502
2503 btrfs_set_trans_block_group(trans, new_dir);
2504 path = btrfs_alloc_path();
2505 if (!path) {
2506 ret = -ENOMEM;
2507 goto out_fail;
2508 }
2509
2510 old_dentry->d_inode->i_nlink++;
2511 old_dir->i_ctime = old_dir->i_mtime = ctime;
2512 new_dir->i_ctime = new_dir->i_mtime = ctime;
2513 old_inode->i_ctime = ctime;
2514
2515 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2516 if (ret)
2517 goto out_fail;
2518
2519 if (new_inode) {
2520 new_inode->i_ctime = CURRENT_TIME;
2521 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2522 if (ret)
2523 goto out_fail;
2524 }
2525 ret = btrfs_add_link(trans, new_dentry, old_inode);
2526 if (ret)
2527 goto out_fail;
2528
2529 out_fail:
2530 btrfs_free_path(path);
2531 btrfs_end_transaction(trans, root);
2532 mutex_unlock(&root->fs_info->fs_mutex);
2533 return ret;
2534 }
2535
2536 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2537 const char *symname)
2538 {
2539 struct btrfs_trans_handle *trans;
2540 struct btrfs_root *root = BTRFS_I(dir)->root;
2541 struct btrfs_path *path;
2542 struct btrfs_key key;
2543 struct inode *inode;
2544 int err;
2545 int drop_inode = 0;
2546 u64 objectid;
2547 int name_len;
2548 int datasize;
2549 unsigned long ptr;
2550 struct btrfs_file_extent_item *ei;
2551 struct extent_buffer *leaf;
2552 unsigned long nr;
2553
2554 name_len = strlen(symname) + 1;
2555 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2556 return -ENAMETOOLONG;
2557 mutex_lock(&root->fs_info->fs_mutex);
2558 trans = btrfs_start_transaction(root, 1);
2559 btrfs_set_trans_block_group(trans, dir);
2560
2561 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2562 if (err) {
2563 err = -ENOSPC;
2564 goto out_unlock;
2565 }
2566
2567 inode = btrfs_new_inode(trans, root, objectid,
2568 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2569 err = PTR_ERR(inode);
2570 if (IS_ERR(inode))
2571 goto out_unlock;
2572
2573 btrfs_set_trans_block_group(trans, inode);
2574 err = btrfs_add_nondir(trans, dentry, inode);
2575 if (err)
2576 drop_inode = 1;
2577 else {
2578 inode->i_mapping->a_ops = &btrfs_aops;
2579 inode->i_fop = &btrfs_file_operations;
2580 inode->i_op = &btrfs_file_inode_operations;
2581 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2582 inode->i_mapping, GFP_NOFS);
2583 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
2584 }
2585 dir->i_sb->s_dirt = 1;
2586 btrfs_update_inode_block_group(trans, inode);
2587 btrfs_update_inode_block_group(trans, dir);
2588 if (drop_inode)
2589 goto out_unlock;
2590
2591 path = btrfs_alloc_path();
2592 BUG_ON(!path);
2593 key.objectid = inode->i_ino;
2594 key.offset = 0;
2595 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2596 datasize = btrfs_file_extent_calc_inline_size(name_len);
2597 err = btrfs_insert_empty_item(trans, root, path, &key,
2598 datasize);
2599 if (err) {
2600 drop_inode = 1;
2601 goto out_unlock;
2602 }
2603 leaf = path->nodes[0];
2604 ei = btrfs_item_ptr(leaf, path->slots[0],
2605 struct btrfs_file_extent_item);
2606 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2607 btrfs_set_file_extent_type(leaf, ei,
2608 BTRFS_FILE_EXTENT_INLINE);
2609 ptr = btrfs_file_extent_inline_start(ei);
2610 write_extent_buffer(leaf, symname, ptr, name_len);
2611 btrfs_mark_buffer_dirty(leaf);
2612 btrfs_free_path(path);
2613
2614 inode->i_op = &btrfs_symlink_inode_operations;
2615 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2616 inode->i_size = name_len - 1;
2617 err = btrfs_update_inode(trans, root, inode);
2618 if (err)
2619 drop_inode = 1;
2620
2621 out_unlock:
2622 nr = trans->blocks_used;
2623 btrfs_end_transaction(trans, root);
2624 mutex_unlock(&root->fs_info->fs_mutex);
2625 if (drop_inode) {
2626 inode_dec_link_count(inode);
2627 iput(inode);
2628 }
2629 btrfs_btree_balance_dirty(root, nr);
2630 return err;
2631 }
2632
2633 static struct inode_operations btrfs_dir_inode_operations = {
2634 .lookup = btrfs_lookup,
2635 .create = btrfs_create,
2636 .unlink = btrfs_unlink,
2637 .link = btrfs_link,
2638 .mkdir = btrfs_mkdir,
2639 .rmdir = btrfs_rmdir,
2640 .rename = btrfs_rename,
2641 .symlink = btrfs_symlink,
2642 .setattr = btrfs_setattr,
2643 .mknod = btrfs_mknod,
2644 .setxattr = generic_setxattr,
2645 .getxattr = generic_getxattr,
2646 .listxattr = btrfs_listxattr,
2647 .removexattr = generic_removexattr,
2648 };
2649
2650 static struct inode_operations btrfs_dir_ro_inode_operations = {
2651 .lookup = btrfs_lookup,
2652 };
2653
2654 static struct file_operations btrfs_dir_file_operations = {
2655 .llseek = generic_file_llseek,
2656 .read = generic_read_dir,
2657 .readdir = btrfs_readdir,
2658 .unlocked_ioctl = btrfs_ioctl,
2659 #ifdef CONFIG_COMPAT
2660 .compat_ioctl = btrfs_ioctl,
2661 #endif
2662 };
2663
2664 static struct extent_map_ops btrfs_extent_map_ops = {
2665 .fill_delalloc = run_delalloc_range,
2666 .writepage_io_hook = btrfs_writepage_io_hook,
2667 .readpage_io_hook = btrfs_readpage_io_hook,
2668 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2669 };
2670
2671 static struct address_space_operations btrfs_aops = {
2672 .readpage = btrfs_readpage,
2673 .writepage = btrfs_writepage,
2674 .writepages = btrfs_writepages,
2675 .readpages = btrfs_readpages,
2676 .sync_page = block_sync_page,
2677 .prepare_write = btrfs_prepare_write,
2678 .commit_write = btrfs_commit_write,
2679 .bmap = btrfs_bmap,
2680 .invalidatepage = btrfs_invalidatepage,
2681 .releasepage = btrfs_releasepage,
2682 .set_page_dirty = __set_page_dirty_nobuffers,
2683 };
2684
2685 static struct address_space_operations btrfs_symlink_aops = {
2686 .readpage = btrfs_readpage,
2687 .writepage = btrfs_writepage,
2688 .invalidatepage = btrfs_invalidatepage,
2689 .releasepage = btrfs_releasepage,
2690 };
2691
2692 static struct inode_operations btrfs_file_inode_operations = {
2693 .truncate = btrfs_truncate,
2694 .getattr = btrfs_getattr,
2695 .setattr = btrfs_setattr,
2696 .setxattr = generic_setxattr,
2697 .getxattr = generic_getxattr,
2698 .listxattr = btrfs_listxattr,
2699 .removexattr = generic_removexattr,
2700 };
2701
2702 static struct inode_operations btrfs_special_inode_operations = {
2703 .getattr = btrfs_getattr,
2704 .setattr = btrfs_setattr,
2705 };
2706
2707 static struct inode_operations btrfs_symlink_inode_operations = {
2708 .readlink = generic_readlink,
2709 .follow_link = page_follow_link_light,
2710 .put_link = page_put_link,
2711 };
Linux kernel - Deliverables
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