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Btrfs: Add file data csums back in via hooks in the extent map code
[deliverable/linux.git] / fs / btrfs / inode.c
CommitLineData
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
42struct btrfs_iget_args {
43 u64 ino;
44 struct btrfs_root *root;
45};
46
47static struct inode_operations btrfs_dir_inode_operations;
48static struct inode_operations btrfs_symlink_inode_operations;
49static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 50static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 51static struct inode_operations btrfs_file_inode_operations;
52static struct address_space_operations btrfs_aops;
53static struct address_space_operations btrfs_symlink_aops;
54static struct file_operations btrfs_dir_file_operations;
07157aac 55static struct extent_map_ops btrfs_extent_map_ops;
39279cc3
CM		 56
57static struct kmem_cache *btrfs_inode_cachep;
58struct kmem_cache *btrfs_trans_handle_cachep;
59struct kmem_cache *btrfs_transaction_cachep;
60struct kmem_cache *btrfs_bit_radix_cachep;
61struct kmem_cache *btrfs_path_cachep;
62
63#define S_SHIFT 12
64static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
65 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
66 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
67 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
68 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
69 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
70 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
71 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
72};
73
b888db2b
CM		 74static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
75{
76 struct btrfs_root *root = BTRFS_I(inode)->root;
77 struct btrfs_trans_handle *trans;
78 struct btrfs_key ins;
79 u64 alloc_hint = 0;
80 u64 num_blocks;
81 int ret;
82 u64 blocksize = 1 << inode->i_blkbits;
83
84 mutex_lock(&root->fs_info->fs_mutex);
85 trans = btrfs_start_transaction(root, 1);
86 btrfs_set_trans_block_group(trans, inode);
87 BUG_ON(!trans);
88 num_blocks = (end - start + blocksize) & ~(blocksize - 1);
89 ret = btrfs_drop_extents(trans, root, inode,
90 start, start + num_blocks, &alloc_hint);
91 num_blocks = num_blocks >> inode->i_blkbits;
92 ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_blocks, 0,
93 alloc_hint, (u64)-1, &ins, 1);
94 if (ret) {
95 WARN_ON(1);
96 goto out;
97 }
98 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
99 start, ins.objectid, ins.offset,
100 ins.offset);
101out:
102 btrfs_end_transaction(trans, root);
103 mutex_unlock(&root->fs_info->fs_mutex);
104 return ret;
105}
106
07157aac
CM		 107int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
108{
109 struct inode *inode = page->mapping->host;
110 struct btrfs_root *root = BTRFS_I(inode)->root;
111 struct btrfs_trans_handle *trans;
112 char *kaddr;
113 int ret;
114 u64 page_start = page->index << PAGE_CACHE_SHIFT;
115 size_t offset = start - page_start;
116
117 mutex_lock(&root->fs_info->fs_mutex);
118 trans = btrfs_start_transaction(root, 1);
119 btrfs_set_trans_block_group(trans, inode);
120 kaddr = kmap(page);
121 btrfs_csum_file_block(trans, root, inode->i_ino,
122 start, kaddr + offset, end - start + 1);
123 kunmap(page);
124 ret = btrfs_end_transaction(trans, root);
125 BUG_ON(ret);
126 mutex_unlock(&root->fs_info->fs_mutex);
127 return ret;
128}
129
130int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
131{
132 int ret = 0;
133 struct inode *inode = page->mapping->host;
134 struct btrfs_root *root = BTRFS_I(inode)->root;
135 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
136 struct btrfs_csum_item *item;
137 struct btrfs_path *path = NULL;
138 u64 private;
139
140 mutex_lock(&root->fs_info->fs_mutex);
141 path = btrfs_alloc_path();
142 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
143 if (IS_ERR(item)) {
144 ret = PTR_ERR(item);
145 /* a csum that isn't present is a preallocated region. */
146 if (ret == -ENOENT || ret == -EFBIG)
147 ret = 0;
148 private = 0;
149 goto out;
150 }
151 memcpy((char *)&private, &item->csum, BTRFS_CRC32_SIZE);
152 set_state_private(em_tree, start, private);
153out:
154 if (path)
155 btrfs_free_path(path);
156 mutex_unlock(&root->fs_info->fs_mutex);
157 return ret;
158}
159
160int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
161{
162 char csum[BTRFS_CRC32_SIZE];
163 size_t offset = start - (page->index << PAGE_CACHE_SHIFT);
164 struct inode *inode = page->mapping->host;
165 struct btrfs_root *root = BTRFS_I(inode)->root;
166 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
167 char *kaddr;
168 u64 private;
169 int ret;
170
171 ret = get_state_private(em_tree, start, &private);
172 kaddr = kmap_atomic(page, KM_IRQ0);
173 if (ret) {
174 goto zeroit;
175 }
176 ret = btrfs_csum_data(root, kaddr + offset, end - start + 1, csum);
177 BUG_ON(ret);
178 if (memcmp(csum, &private, BTRFS_CRC32_SIZE)) {
179 goto zeroit;
180 }
181 kunmap_atomic(kaddr, KM_IRQ0);
182 return 0;
183
184zeroit:
185 printk("btrfs csum failed ino %lu off %llu\n",
186 page->mapping->host->i_ino, (unsigned long long)start);
187 memset(kaddr + offset, 1, end - start + 1); flush_dcache_page(page);
188 kunmap_atomic(kaddr, KM_IRQ0);
189 return 0;
190}
b888db2b 191
39279cc3
CM		 192void btrfs_read_locked_inode(struct inode *inode)
193{
194 struct btrfs_path *path;
195 struct btrfs_inode_item *inode_item;
196 struct btrfs_root *root = BTRFS_I(inode)->root;
197 struct btrfs_key location;
198 u64 alloc_group_block;
618e21d5 199 u32 rdev;
39279cc3
CM		 200 int ret;
201
202 path = btrfs_alloc_path();
203 BUG_ON(!path);
39279cc3
CM		 204 mutex_lock(&root->fs_info->fs_mutex);
205
206 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
207 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
208 if (ret) {
209 btrfs_free_path(path);
210 goto make_bad;
211 }
212 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
213 path->slots[0],
214 struct btrfs_inode_item);
215
216 inode->i_mode = btrfs_inode_mode(inode_item);
217 inode->i_nlink = btrfs_inode_nlink(inode_item);
218 inode->i_uid = btrfs_inode_uid(inode_item);
219 inode->i_gid = btrfs_inode_gid(inode_item);
220 inode->i_size = btrfs_inode_size(inode_item);
221 inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
222 inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
223 inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
224 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
225 inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
226 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
227 inode->i_blocks = btrfs_inode_nblocks(inode_item);
228 inode->i_generation = btrfs_inode_generation(inode_item);
618e21d5
JB		 229 inode->i_rdev = 0;
230 rdev = btrfs_inode_rdev(inode_item);
39279cc3
CM		 231 alloc_group_block = btrfs_inode_block_group(inode_item);
232 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
233 alloc_group_block);
234
235 btrfs_free_path(path);
236 inode_item = NULL;
237
238 mutex_unlock(&root->fs_info->fs_mutex);
239
240 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 241 case S_IFREG:
242 inode->i_mapping->a_ops = &btrfs_aops;
07157aac 243 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 244 inode->i_fop = &btrfs_file_operations;
245 inode->i_op = &btrfs_file_inode_operations;
246 break;
247 case S_IFDIR:
248 inode->i_fop = &btrfs_dir_file_operations;
249 if (root == root->fs_info->tree_root)
250 inode->i_op = &btrfs_dir_ro_inode_operations;
251 else
252 inode->i_op = &btrfs_dir_inode_operations;
253 break;
254 case S_IFLNK:
255 inode->i_op = &btrfs_symlink_inode_operations;
256 inode->i_mapping->a_ops = &btrfs_symlink_aops;
257 break;
618e21d5
JB		 258 default:
259 init_special_inode(inode, inode->i_mode, rdev);
260 break;
39279cc3
CM		 261 }
262 return;
263
264make_bad:
265 btrfs_release_path(root, path);
266 btrfs_free_path(path);
267 mutex_unlock(&root->fs_info->fs_mutex);
268 make_bad_inode(inode);
269}
270
271static void fill_inode_item(struct btrfs_inode_item *item,
272 struct inode *inode)
273{
274 btrfs_set_inode_uid(item, inode->i_uid);
275 btrfs_set_inode_gid(item, inode->i_gid);
276 btrfs_set_inode_size(item, inode->i_size);
277 btrfs_set_inode_mode(item, inode->i_mode);
278 btrfs_set_inode_nlink(item, inode->i_nlink);
279 btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
280 btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
281 btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
282 btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
283 btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
284 btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
285 btrfs_set_inode_nblocks(item, inode->i_blocks);
286 btrfs_set_inode_generation(item, inode->i_generation);
618e21d5 287 btrfs_set_inode_rdev(item, inode->i_rdev);
39279cc3
CM		 288 btrfs_set_inode_block_group(item,
289 BTRFS_I(inode)->block_group->key.objectid);
290}
291
a52d9a80 292int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 293 struct btrfs_root *root,
294 struct inode *inode)
295{
296 struct btrfs_inode_item *inode_item;
297 struct btrfs_path *path;
298 int ret;
299
300 path = btrfs_alloc_path();
301 BUG_ON(!path);
39279cc3
CM		 302 ret = btrfs_lookup_inode(trans, root, path,
303 &BTRFS_I(inode)->location, 1);
304 if (ret) {
305 if (ret > 0)
306 ret = -ENOENT;
307 goto failed;
308 }
309
310 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
311 path->slots[0],
312 struct btrfs_inode_item);
313
314 fill_inode_item(inode_item, inode);
315 btrfs_mark_buffer_dirty(path->nodes[0]);
15ee9bc7 316 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 317 ret = 0;
318failed:
319 btrfs_release_path(root, path);
320 btrfs_free_path(path);
321 return ret;
322}
323
324
325static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
326 struct btrfs_root *root,
327 struct inode *dir,
328 struct dentry *dentry)
329{
330 struct btrfs_path *path;
331 const char *name = dentry->d_name.name;
332 int name_len = dentry->d_name.len;
333 int ret = 0;
334 u64 objectid;
335 struct btrfs_dir_item *di;
336
337 path = btrfs_alloc_path();
54aa1f4d
CM		 338 if (!path) {
339 ret = -ENOMEM;
340 goto err;
341 }
342
39279cc3
CM		 343 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
344 name, name_len, -1);
345 if (IS_ERR(di)) {
346 ret = PTR_ERR(di);
347 goto err;
348 }
349 if (!di) {
350 ret = -ENOENT;
351 goto err;
352 }
353 objectid = btrfs_disk_key_objectid(&di->location);
354 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 355 if (ret)
356 goto err;
39279cc3
CM		 357 btrfs_release_path(root, path);
358
359 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
360 objectid, name, name_len, -1);
361 if (IS_ERR(di)) {
362 ret = PTR_ERR(di);
363 goto err;
364 }
365 if (!di) {
366 ret = -ENOENT;
367 goto err;
368 }
369 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 370
371 dentry->d_inode->i_ctime = dir->i_ctime;
372err:
373 btrfs_free_path(path);
374 if (!ret) {
375 dir->i_size -= name_len * 2;
79c44584 376 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3
CM		 377 btrfs_update_inode(trans, root, dir);
378 drop_nlink(dentry->d_inode);
54aa1f4d 379 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 380 dir->i_sb->s_dirt = 1;
381 }
382 return ret;
383}
384
385static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
386{
387 struct btrfs_root *root;
388 struct btrfs_trans_handle *trans;
389 int ret;
390
391 root = BTRFS_I(dir)->root;
392 mutex_lock(&root->fs_info->fs_mutex);
393 trans = btrfs_start_transaction(root, 1);
394 btrfs_set_trans_block_group(trans, dir);
395 ret = btrfs_unlink_trans(trans, root, dir, dentry);
396 btrfs_end_transaction(trans, root);
397 mutex_unlock(&root->fs_info->fs_mutex);
398 btrfs_btree_balance_dirty(root);
399 return ret;
400}
401
402static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
403{
404 struct inode *inode = dentry->d_inode;
405 int err;
406 int ret;
407 struct btrfs_root *root = BTRFS_I(dir)->root;
408 struct btrfs_path *path;
409 struct btrfs_key key;
410 struct btrfs_trans_handle *trans;
411 struct btrfs_key found_key;
412 int found_type;
413 struct btrfs_leaf *leaf;
414 char *goodnames = "..";
415
416 path = btrfs_alloc_path();
417 BUG_ON(!path);
39279cc3
CM		 418 mutex_lock(&root->fs_info->fs_mutex);
419 trans = btrfs_start_transaction(root, 1);
420 btrfs_set_trans_block_group(trans, dir);
421 key.objectid = inode->i_ino;
422 key.offset = (u64)-1;
423 key.flags = (u32)-1;
424 while(1) {
425 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
426 if (ret < 0) {
427 err = ret;
428 goto out;
429 }
430 BUG_ON(ret == 0);
431 if (path->slots[0] == 0) {
432 err = -ENOENT;
433 goto out;
434 }
435 path->slots[0]--;
436 leaf = btrfs_buffer_leaf(path->nodes[0]);
437 btrfs_disk_key_to_cpu(&found_key,
438 &leaf->items[path->slots[0]].key);
439 found_type = btrfs_key_type(&found_key);
440 if (found_key.objectid != inode->i_ino) {
441 err = -ENOENT;
442 goto out;
443 }
444 if ((found_type != BTRFS_DIR_ITEM_KEY &&
445 found_type != BTRFS_DIR_INDEX_KEY) ||
446 (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
447 !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
448 err = -ENOTEMPTY;
449 goto out;
450 }
451 ret = btrfs_del_item(trans, root, path);
452 BUG_ON(ret);
453
454 if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
455 break;
456 btrfs_release_path(root, path);
457 }
458 ret = 0;
459 btrfs_release_path(root, path);
460
461 /* now the directory is empty */
462 err = btrfs_unlink_trans(trans, root, dir, dentry);
463 if (!err) {
464 inode->i_size = 0;
465 }
466out:
467 btrfs_release_path(root, path);
468 btrfs_free_path(path);
469 mutex_unlock(&root->fs_info->fs_mutex);
470 ret = btrfs_end_transaction(trans, root);
471 btrfs_btree_balance_dirty(root);
472 if (ret && !err)
473 err = ret;
474 return err;
475}
476
477static int btrfs_free_inode(struct btrfs_trans_handle *trans,
478 struct btrfs_root *root,
479 struct inode *inode)
480{
481 struct btrfs_path *path;
482 int ret;
483
484 clear_inode(inode);
485
486 path = btrfs_alloc_path();
487 BUG_ON(!path);
39279cc3
CM		 488 ret = btrfs_lookup_inode(trans, root, path,
489 &BTRFS_I(inode)->location, -1);
54aa1f4d
CM		 490 if (ret > 0)
491 ret = -ENOENT;
492 if (!ret)
493 ret = btrfs_del_item(trans, root, path);
39279cc3
CM		 494 btrfs_free_path(path);
495 return ret;
496}
497
39279cc3
CM		 498/*
499 * this can truncate away extent items, csum items and directory items.
500 * It starts at a high offset and removes keys until it can't find
501 * any higher than i_size.
502 *
503 * csum items that cross the new i_size are truncated to the new size
504 * as well.
505 */
506static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
507 struct btrfs_root *root,
508 struct inode *inode)
509{
510 int ret;
511 struct btrfs_path *path;
512 struct btrfs_key key;
513 struct btrfs_disk_key *found_key;
514 u32 found_type;
515 struct btrfs_leaf *leaf;
516 struct btrfs_file_extent_item *fi;
517 u64 extent_start = 0;
518 u64 extent_num_blocks = 0;
519 u64 item_end = 0;
520 int found_extent;
521 int del_item;
522
a52d9a80 523 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 524 path = btrfs_alloc_path();
3c69faec 525 path->reada = -1;
39279cc3
CM		 526 BUG_ON(!path);
527 /* FIXME, add redo link to tree so we don't leak on crash */
528 key.objectid = inode->i_ino;
529 key.offset = (u64)-1;
530 key.flags = (u32)-1;
531 while(1) {
532 btrfs_init_path(path);
533 fi = NULL;
534 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
535 if (ret < 0) {
536 goto error;
537 }
538 if (ret > 0) {
539 BUG_ON(path->slots[0] == 0);
540 path->slots[0]--;
541 }
39279cc3
CM		 542 leaf = btrfs_buffer_leaf(path->nodes[0]);
543 found_key = &leaf->items[path->slots[0]].key;
544 found_type = btrfs_disk_key_type(found_key);
545
546 if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
547 break;
548 if (found_type != BTRFS_CSUM_ITEM_KEY &&
549 found_type != BTRFS_DIR_ITEM_KEY &&
550 found_type != BTRFS_DIR_INDEX_KEY &&
551 found_type != BTRFS_EXTENT_DATA_KEY)
552 break;
553
554 item_end = btrfs_disk_key_offset(found_key);
555 if (found_type == BTRFS_EXTENT_DATA_KEY) {
556 fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
557 path->slots[0],
558 struct btrfs_file_extent_item);
559 if (btrfs_file_extent_type(fi) !=
560 BTRFS_FILE_EXTENT_INLINE) {
561 item_end += btrfs_file_extent_num_blocks(fi) <<
562 inode->i_blkbits;
563 }
564 }
565 if (found_type == BTRFS_CSUM_ITEM_KEY) {
566 ret = btrfs_csum_truncate(trans, root, path,
567 inode->i_size);
568 BUG_ON(ret);
569 }
570 if (item_end < inode->i_size) {
b888db2b
CM		 571 if (found_type == BTRFS_DIR_ITEM_KEY) {
572 found_type = BTRFS_INODE_ITEM_KEY;
573 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
574 found_type = BTRFS_CSUM_ITEM_KEY;
575 } else if (found_type) {
576 found_type--;
577 } else {
578 break;
39279cc3 579 }
b888db2b
CM		 580 btrfs_set_key_type(&key, found_type - 1);
581 continue;
39279cc3
CM		 582 }
583 if (btrfs_disk_key_offset(found_key) >= inode->i_size)
584 del_item = 1;
585 else
586 del_item = 0;
587 found_extent = 0;
588
589 /* FIXME, shrink the extent if the ref count is only 1 */
590 if (found_type == BTRFS_EXTENT_DATA_KEY &&
591 btrfs_file_extent_type(fi) !=
592 BTRFS_FILE_EXTENT_INLINE) {
593 u64 num_dec;
594 if (!del_item) {
595 u64 orig_num_blocks =
596 btrfs_file_extent_num_blocks(fi);
597 extent_num_blocks = inode->i_size -
598 btrfs_disk_key_offset(found_key) +
599 root->blocksize - 1;
600 extent_num_blocks >>= inode->i_blkbits;
601 btrfs_set_file_extent_num_blocks(fi,
602 extent_num_blocks);
603 inode->i_blocks -= (orig_num_blocks -
604 extent_num_blocks) << 3;
ccd467d6 605 btrfs_mark_buffer_dirty(path->nodes[0]);
39279cc3
CM		 606 } else {
607 extent_start =
608 btrfs_file_extent_disk_blocknr(fi);
609 extent_num_blocks =
610 btrfs_file_extent_disk_num_blocks(fi);
611 /* FIXME blocksize != 4096 */
612 num_dec = btrfs_file_extent_num_blocks(fi) << 3;
613 if (extent_start != 0) {
614 found_extent = 1;
615 inode->i_blocks -= num_dec;
616 }
617 }
618 }
619 if (del_item) {
620 ret = btrfs_del_item(trans, root, path);
54aa1f4d
CM		 621 if (ret)
622 goto error;
39279cc3
CM		 623 } else {
624 break;
625 }
626 btrfs_release_path(root, path);
627 if (found_extent) {
628 ret = btrfs_free_extent(trans, root, extent_start,
629 extent_num_blocks, 0);
630 BUG_ON(ret);
631 }
632 }
633 ret = 0;
634error:
635 btrfs_release_path(root, path);
636 btrfs_free_path(path);
637 inode->i_sb->s_dirt = 1;
638 return ret;
639}
640
b888db2b 641static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 642 size_t zero_start)
643{
644 char *kaddr;
645 int ret = 0;
b888db2b 646 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
a52d9a80 647 u64 page_start = page->index << PAGE_CACHE_SHIFT;
b888db2b 648 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
a52d9a80
CM		 649
650 if (!PagePrivate(page)) {
651 SetPagePrivate(page);
652 set_page_private(page, 1);
b888db2b 653 WARN_ON(!page->mapping->a_ops->invalidatepage);
a52d9a80
CM		 654 page_cache_get(page);
655 }
656
b888db2b
CM		 657 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
658 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
659 page_end, GFP_NOFS);
a52d9a80 660 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 661 kaddr = kmap(page);
a52d9a80
CM		 662 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
663 flush_dcache_page(page);
b888db2b 664 kunmap(page);
a52d9a80 665 }
b888db2b
CM		 666 set_page_dirty(page);
667 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
a52d9a80 668
a52d9a80
CM		 669 return ret;
670}
671
39279cc3
CM		 672/*
673 * taken from block_truncate_page, but does cow as it zeros out
674 * any bytes left in the last page in the file.
675 */
676static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
677{
678 struct inode *inode = mapping->host;
679 unsigned blocksize = 1 << inode->i_blkbits;
680 pgoff_t index = from >> PAGE_CACHE_SHIFT;
681 unsigned offset = from & (PAGE_CACHE_SIZE-1);
682 struct page *page;
39279cc3 683 int ret = 0;
a52d9a80 684 u64 page_start;
39279cc3
CM		 685
686 if ((offset & (blocksize - 1)) == 0)
687 goto out;
688
689 ret = -ENOMEM;
690 page = grab_cache_page(mapping, index);
691 if (!page)
692 goto out;
39279cc3 693 if (!PageUptodate(page)) {
9ebefb18 694 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 695 lock_page(page);
696 if (!PageUptodate(page)) {
697 ret = -EIO;
698 goto out;
699 }
700 }
a52d9a80
CM		 701 page_start = page->index << PAGE_CACHE_SHIFT;
702
b888db2b 703 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 704
39279cc3
CM		 705 unlock_page(page);
706 page_cache_release(page);
707out:
708 return ret;
709}
710
711static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
712{
713 struct inode *inode = dentry->d_inode;
714 int err;
715
716 err = inode_change_ok(inode, attr);
717 if (err)
718 return err;
719
720 if (S_ISREG(inode->i_mode) &&
721 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
722 struct btrfs_trans_handle *trans;
723 struct btrfs_root *root = BTRFS_I(inode)->root;
724 u64 mask = root->blocksize - 1;
725 u64 pos = (inode->i_size + mask) & ~mask;
726 u64 hole_size;
727
728 if (attr->ia_size <= pos)
729 goto out;
730
731 btrfs_truncate_page(inode->i_mapping, inode->i_size);
732
733 hole_size = (attr->ia_size - pos + mask) & ~mask;
734 hole_size >>= inode->i_blkbits;
735
736 mutex_lock(&root->fs_info->fs_mutex);
737 trans = btrfs_start_transaction(root, 1);
738 btrfs_set_trans_block_group(trans, inode);
739 err = btrfs_insert_file_extent(trans, root, inode->i_ino,
740 pos, 0, 0, hole_size);
39279cc3
CM		 741 btrfs_end_transaction(trans, root);
742 mutex_unlock(&root->fs_info->fs_mutex);
54aa1f4d
CM		 743 if (err)
744 return err;
39279cc3
CM		 745 }
746out:
747 err = inode_setattr(inode, attr);
748
749 return err;
750}
751void btrfs_delete_inode(struct inode *inode)
752{
753 struct btrfs_trans_handle *trans;
754 struct btrfs_root *root = BTRFS_I(inode)->root;
755 int ret;
756
757 truncate_inode_pages(&inode->i_data, 0);
758 if (is_bad_inode(inode)) {
759 goto no_delete;
760 }
761 inode->i_size = 0;
762 mutex_lock(&root->fs_info->fs_mutex);
763 trans = btrfs_start_transaction(root, 1);
764 btrfs_set_trans_block_group(trans, inode);
765 ret = btrfs_truncate_in_trans(trans, root, inode);
54aa1f4d
CM		 766 if (ret)
767 goto no_delete_lock;
768 ret = btrfs_free_inode(trans, root, inode);
769 if (ret)
770 goto no_delete_lock;
39279cc3
CM		 771 btrfs_end_transaction(trans, root);
772 mutex_unlock(&root->fs_info->fs_mutex);
773 btrfs_btree_balance_dirty(root);
774 return;
54aa1f4d
CM		 775
776no_delete_lock:
777 btrfs_end_transaction(trans, root);
778 mutex_unlock(&root->fs_info->fs_mutex);
779 btrfs_btree_balance_dirty(root);
39279cc3
CM		 780no_delete:
781 clear_inode(inode);
782}
783
784/*
785 * this returns the key found in the dir entry in the location pointer.
786 * If no dir entries were found, location->objectid is 0.
787 */
788static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
789 struct btrfs_key *location)
790{
791 const char *name = dentry->d_name.name;
792 int namelen = dentry->d_name.len;
793 struct btrfs_dir_item *di;
794 struct btrfs_path *path;
795 struct btrfs_root *root = BTRFS_I(dir)->root;
796 int ret;
797
798 path = btrfs_alloc_path();
799 BUG_ON(!path);
39279cc3
CM		 800 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
801 namelen, 0);
802 if (!di || IS_ERR(di)) {
803 location->objectid = 0;
804 ret = 0;
805 goto out;
806 }
807 btrfs_disk_key_to_cpu(location, &di->location);
808out:
809 btrfs_release_path(root, path);
810 btrfs_free_path(path);
811 return ret;
812}
813
814/*
815 * when we hit a tree root in a directory, the btrfs part of the inode
816 * needs to be changed to reflect the root directory of the tree root. This
817 * is kind of like crossing a mount point.
818 */
819static int fixup_tree_root_location(struct btrfs_root *root,
820 struct btrfs_key *location,
58176a96
JB		 821 struct btrfs_root **sub_root,
822 struct dentry *dentry)
39279cc3
CM		 823{
824 struct btrfs_path *path;
825 struct btrfs_root_item *ri;
826
827 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
828 return 0;
829 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
830 return 0;
831
832 path = btrfs_alloc_path();
833 BUG_ON(!path);
834 mutex_lock(&root->fs_info->fs_mutex);
835
58176a96
JB		 836 *sub_root = btrfs_read_fs_root(root->fs_info, location,
837 dentry->d_name.name,
838 dentry->d_name.len);
39279cc3
CM		 839 if (IS_ERR(*sub_root))
840 return PTR_ERR(*sub_root);
841
842 ri = &(*sub_root)->root_item;
843 location->objectid = btrfs_root_dirid(ri);
844 location->flags = 0;
845 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
846 location->offset = 0;
847
848 btrfs_free_path(path);
849 mutex_unlock(&root->fs_info->fs_mutex);
850 return 0;
851}
852
853static int btrfs_init_locked_inode(struct inode *inode, void *p)
854{
855 struct btrfs_iget_args *args = p;
856 inode->i_ino = args->ino;
857 BTRFS_I(inode)->root = args->root;
b888db2b
CM		 858 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
859 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 860 return 0;
861}
862
863static int btrfs_find_actor(struct inode *inode, void *opaque)
864{
865 struct btrfs_iget_args *args = opaque;
866 return (args->ino == inode->i_ino &&
867 args->root == BTRFS_I(inode)->root);
868}
869
870struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
871 struct btrfs_root *root)
872{
873 struct inode *inode;
874 struct btrfs_iget_args args;
875 args.ino = objectid;
876 args.root = root;
877
878 inode = iget5_locked(s, objectid, btrfs_find_actor,
879 btrfs_init_locked_inode,
880 (void *)&args);
881 return inode;
882}
883
884static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
885 struct nameidata *nd)
886{
887 struct inode * inode;
888 struct btrfs_inode *bi = BTRFS_I(dir);
889 struct btrfs_root *root = bi->root;
890 struct btrfs_root *sub_root = root;
891 struct btrfs_key location;
892 int ret;
893
894 if (dentry->d_name.len > BTRFS_NAME_LEN)
895 return ERR_PTR(-ENAMETOOLONG);
896 mutex_lock(&root->fs_info->fs_mutex);
897 ret = btrfs_inode_by_name(dir, dentry, &location);
898 mutex_unlock(&root->fs_info->fs_mutex);
899 if (ret < 0)
900 return ERR_PTR(ret);
901 inode = NULL;
902 if (location.objectid) {
58176a96
JB		 903 ret = fixup_tree_root_location(root, &location, &sub_root,
904 dentry);
39279cc3
CM		 905 if (ret < 0)
906 return ERR_PTR(ret);
907 if (ret > 0)
908 return ERR_PTR(-ENOENT);
909 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
910 sub_root);
911 if (!inode)
912 return ERR_PTR(-EACCES);
913 if (inode->i_state & I_NEW) {
914 /* the inode and parent dir are two different roots */
915 if (sub_root != root) {
916 igrab(inode);
917 sub_root->inode = inode;
918 }
919 BTRFS_I(inode)->root = sub_root;
920 memcpy(&BTRFS_I(inode)->location, &location,
921 sizeof(location));
922 btrfs_read_locked_inode(inode);
923 unlock_new_inode(inode);
924 }
925 }
926 return d_splice_alias(inode, dentry);
927}
928
39279cc3
CM		 929static unsigned char btrfs_filetype_table[] = {
930 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
931};
932
933static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
934{
935 struct inode *inode = filp->f_path.dentry->d_inode;
936 struct btrfs_root *root = BTRFS_I(inode)->root;
937 struct btrfs_item *item;
938 struct btrfs_dir_item *di;
939 struct btrfs_key key;
940 struct btrfs_path *path;
941 int ret;
942 u32 nritems;
943 struct btrfs_leaf *leaf;
944 int slot;
945 int advance;
946 unsigned char d_type;
947 int over = 0;
948 u32 di_cur;
949 u32 di_total;
950 u32 di_len;
951 int key_type = BTRFS_DIR_INDEX_KEY;
952
953 /* FIXME, use a real flag for deciding about the key type */
954 if (root->fs_info->tree_root == root)
955 key_type = BTRFS_DIR_ITEM_KEY;
956 mutex_lock(&root->fs_info->fs_mutex);
957 key.objectid = inode->i_ino;
958 key.flags = 0;
959 btrfs_set_key_type(&key, key_type);
960 key.offset = filp->f_pos;
961 path = btrfs_alloc_path();
2cc58cf2 962 path->reada = 2;
39279cc3
CM		 963 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
964 if (ret < 0)
965 goto err;
966 advance = 0;
39279cc3
CM		 967 while(1) {
968 leaf = btrfs_buffer_leaf(path->nodes[0]);
969 nritems = btrfs_header_nritems(&leaf->header);
970 slot = path->slots[0];
971 if (advance || slot >= nritems) {
972 if (slot >= nritems -1) {
39279cc3
CM		 973 ret = btrfs_next_leaf(root, path);
974 if (ret)
975 break;
976 leaf = btrfs_buffer_leaf(path->nodes[0]);
977 nritems = btrfs_header_nritems(&leaf->header);
978 slot = path->slots[0];
979 } else {
980 slot++;
981 path->slots[0]++;
982 }
983 }
984 advance = 1;
985 item = leaf->items + slot;
986 if (btrfs_disk_key_objectid(&item->key) != key.objectid)
987 break;
988 if (btrfs_disk_key_type(&item->key) != key_type)
989 break;
990 if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
991 continue;
992 filp->f_pos = btrfs_disk_key_offset(&item->key);
993 advance = 1;
994 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
995 di_cur = 0;
996 di_total = btrfs_item_size(leaf->items + slot);
997 while(di_cur < di_total) {
998 d_type = btrfs_filetype_table[btrfs_dir_type(di)];
999 over = filldir(dirent, (const char *)(di + 1),
1000 btrfs_dir_name_len(di),
1001 btrfs_disk_key_offset(&item->key),
1002 btrfs_disk_key_objectid(&di->location),
1003 d_type);
1004 if (over)
1005 goto nopos;
1006 di_len = btrfs_dir_name_len(di) + sizeof(*di);
1007 di_cur += di_len;
1008 di = (struct btrfs_dir_item *)((char *)di + di_len);
1009 }
1010 }
1011 filp->f_pos++;
1012nopos:
1013 ret = 0;
1014err:
1015 btrfs_release_path(root, path);
1016 btrfs_free_path(path);
1017 mutex_unlock(&root->fs_info->fs_mutex);
1018 return ret;
1019}
1020
1021int btrfs_write_inode(struct inode *inode, int wait)
1022{
1023 struct btrfs_root *root = BTRFS_I(inode)->root;
1024 struct btrfs_trans_handle *trans;
1025 int ret = 0;
1026
1027 if (wait) {
1028 mutex_lock(&root->fs_info->fs_mutex);
1029 trans = btrfs_start_transaction(root, 1);
1030 btrfs_set_trans_block_group(trans, inode);
1031 ret = btrfs_commit_transaction(trans, root);
1032 mutex_unlock(&root->fs_info->fs_mutex);
1033 }
1034 return ret;
1035}
1036
1037/*
54aa1f4d 1038 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1039 * inode changes. But, it is most likely to find the inode in cache.
1040 * FIXME, needs more benchmarking...there are no reasons other than performance
1041 * to keep or drop this code.
1042 */
1043void btrfs_dirty_inode(struct inode *inode)
1044{
1045 struct btrfs_root *root = BTRFS_I(inode)->root;
1046 struct btrfs_trans_handle *trans;
1047
1048 mutex_lock(&root->fs_info->fs_mutex);
1049 trans = btrfs_start_transaction(root, 1);
1050 btrfs_set_trans_block_group(trans, inode);
1051 btrfs_update_inode(trans, root, inode);
1052 btrfs_end_transaction(trans, root);
1053 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1054}
1055
1056static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1057 struct btrfs_root *root,
1058 u64 objectid,
1059 struct btrfs_block_group_cache *group,
1060 int mode)
1061{
1062 struct inode *inode;
1063 struct btrfs_inode_item inode_item;
1064 struct btrfs_key *location;
1065 int ret;
1066 int owner;
1067
1068 inode = new_inode(root->fs_info->sb);
1069 if (!inode)
1070 return ERR_PTR(-ENOMEM);
1071
b888db2b
CM		 1072 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1073 inode->i_mapping, GFP_NOFS);
39279cc3 1074 BTRFS_I(inode)->root = root;
b888db2b 1075
39279cc3
CM		 1076 if (mode & S_IFDIR)
1077 owner = 0;
1078 else
1079 owner = 1;
1080 group = btrfs_find_block_group(root, group, 0, 0, owner);
1081 BTRFS_I(inode)->block_group = group;
1082
1083 inode->i_uid = current->fsuid;
1084 inode->i_gid = current->fsgid;
1085 inode->i_mode = mode;
1086 inode->i_ino = objectid;
1087 inode->i_blocks = 0;
1088 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1089 fill_inode_item(&inode_item, inode);
1090 location = &BTRFS_I(inode)->location;
1091 location->objectid = objectid;
1092 location->flags = 0;
1093 location->offset = 0;
1094 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1095
1096 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
54aa1f4d
CM		 1097 if (ret)
1098 return ERR_PTR(ret);
39279cc3
CM		 1099 insert_inode_hash(inode);
1100 return inode;
1101}
1102
1103static inline u8 btrfs_inode_type(struct inode *inode)
1104{
1105 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1106}
1107
1108static int btrfs_add_link(struct btrfs_trans_handle *trans,
1109 struct dentry *dentry, struct inode *inode)
1110{
1111 int ret;
1112 struct btrfs_key key;
1113 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1114 struct inode *parent_inode;
39279cc3
CM		 1115 key.objectid = inode->i_ino;
1116 key.flags = 0;
1117 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1118 key.offset = 0;
1119
1120 ret = btrfs_insert_dir_item(trans, root,
1121 dentry->d_name.name, dentry->d_name.len,
1122 dentry->d_parent->d_inode->i_ino,
1123 &key, btrfs_inode_type(inode));
1124 if (ret == 0) {
79c44584
CM		 1125 parent_inode = dentry->d_parent->d_inode;
1126 parent_inode->i_size += dentry->d_name.len * 2;
1127 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1128 ret = btrfs_update_inode(trans, root,
1129 dentry->d_parent->d_inode);
1130 }
1131 return ret;
1132}
1133
1134static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1135 struct dentry *dentry, struct inode *inode)
1136{
1137 int err = btrfs_add_link(trans, dentry, inode);
1138 if (!err) {
1139 d_instantiate(dentry, inode);
1140 return 0;
1141 }
1142 if (err > 0)
1143 err = -EEXIST;
1144 return err;
1145}
1146
618e21d5
JB		 1147static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1148 int mode, dev_t rdev)
1149{
1150 struct btrfs_trans_handle *trans;
1151 struct btrfs_root *root = BTRFS_I(dir)->root;
1152 struct inode *inode;
1153 int err;
1154 int drop_inode = 0;
1155 u64 objectid;
1156
1157 if (!new_valid_dev(rdev))
1158 return -EINVAL;
1159
1160 mutex_lock(&root->fs_info->fs_mutex);
1161 trans = btrfs_start_transaction(root, 1);
1162 btrfs_set_trans_block_group(trans, dir);
1163
1164 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1165 if (err) {
1166 err = -ENOSPC;
1167 goto out_unlock;
1168 }
1169
1170 inode = btrfs_new_inode(trans, root, objectid,
1171 BTRFS_I(dir)->block_group, mode);
1172 err = PTR_ERR(inode);
1173 if (IS_ERR(inode))
1174 goto out_unlock;
1175
1176 btrfs_set_trans_block_group(trans, inode);
1177 err = btrfs_add_nondir(trans, dentry, inode);
1178 if (err)
1179 drop_inode = 1;
1180 else {
1181 inode->i_op = &btrfs_special_inode_operations;
1182 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1183 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1184 }
1185 dir->i_sb->s_dirt = 1;
1186 btrfs_update_inode_block_group(trans, inode);
1187 btrfs_update_inode_block_group(trans, dir);
1188out_unlock:
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
39279cc3
CM		 1200static int btrfs_create(struct inode *dir, struct dentry *dentry,
1201 int mode, struct nameidata *nd)
1202{
1203 struct btrfs_trans_handle *trans;
1204 struct btrfs_root *root = BTRFS_I(dir)->root;
1205 struct inode *inode;
1206 int err;
1207 int drop_inode = 0;
1208 u64 objectid;
1209
1210 mutex_lock(&root->fs_info->fs_mutex);
1211 trans = btrfs_start_transaction(root, 1);
1212 btrfs_set_trans_block_group(trans, dir);
1213
1214 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1215 if (err) {
1216 err = -ENOSPC;
1217 goto out_unlock;
1218 }
1219
1220 inode = btrfs_new_inode(trans, root, objectid,
1221 BTRFS_I(dir)->block_group, mode);
1222 err = PTR_ERR(inode);
1223 if (IS_ERR(inode))
1224 goto out_unlock;
1225
1226 btrfs_set_trans_block_group(trans, inode);
1227 err = btrfs_add_nondir(trans, dentry, inode);
1228 if (err)
1229 drop_inode = 1;
1230 else {
1231 inode->i_mapping->a_ops = &btrfs_aops;
1232 inode->i_fop = &btrfs_file_operations;
1233 inode->i_op = &btrfs_file_inode_operations;
a52d9a80
CM		 1234 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1235 inode->i_mapping, GFP_NOFS);
07157aac 1236 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 1237 }
1238 dir->i_sb->s_dirt = 1;
1239 btrfs_update_inode_block_group(trans, inode);
1240 btrfs_update_inode_block_group(trans, dir);
1241out_unlock:
1242 btrfs_end_transaction(trans, root);
1243 mutex_unlock(&root->fs_info->fs_mutex);
1244
1245 if (drop_inode) {
1246 inode_dec_link_count(inode);
1247 iput(inode);
1248 }
1249 btrfs_btree_balance_dirty(root);
1250 return err;
1251}
1252
1253static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1254 struct dentry *dentry)
1255{
1256 struct btrfs_trans_handle *trans;
1257 struct btrfs_root *root = BTRFS_I(dir)->root;
1258 struct inode *inode = old_dentry->d_inode;
1259 int err;
1260 int drop_inode = 0;
1261
1262 if (inode->i_nlink == 0)
1263 return -ENOENT;
1264
1265 inc_nlink(inode);
1266 mutex_lock(&root->fs_info->fs_mutex);
1267 trans = btrfs_start_transaction(root, 1);
1268 btrfs_set_trans_block_group(trans, dir);
1269 atomic_inc(&inode->i_count);
1270 err = btrfs_add_nondir(trans, dentry, inode);
1271 if (err)
1272 drop_inode = 1;
1273 dir->i_sb->s_dirt = 1;
1274 btrfs_update_inode_block_group(trans, dir);
54aa1f4d
CM		 1275 err = btrfs_update_inode(trans, root, inode);
1276 if (err)
1277 drop_inode = 1;
39279cc3
CM		 1278
1279 btrfs_end_transaction(trans, root);
1280 mutex_unlock(&root->fs_info->fs_mutex);
1281
1282 if (drop_inode) {
1283 inode_dec_link_count(inode);
1284 iput(inode);
1285 }
1286 btrfs_btree_balance_dirty(root);
1287 return err;
1288}
1289
1290static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
1291 struct btrfs_root *root,
1292 u64 objectid, u64 dirid)
1293{
1294 int ret;
1295 char buf[2];
1296 struct btrfs_key key;
1297
1298 buf[0] = '.';
1299 buf[1] = '.';
1300
1301 key.objectid = objectid;
1302 key.offset = 0;
1303 key.flags = 0;
1304 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1305
1306 ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
1307 &key, BTRFS_FT_DIR);
1308 if (ret)
1309 goto error;
1310 key.objectid = dirid;
1311 ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
1312 &key, BTRFS_FT_DIR);
1313 if (ret)
1314 goto error;
1315error:
1316 return ret;
1317}
1318
1319static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1320{
1321 struct inode *inode;
1322 struct btrfs_trans_handle *trans;
1323 struct btrfs_root *root = BTRFS_I(dir)->root;
1324 int err = 0;
1325 int drop_on_err = 0;
1326 u64 objectid;
1327
1328 mutex_lock(&root->fs_info->fs_mutex);
1329 trans = btrfs_start_transaction(root, 1);
1330 btrfs_set_trans_block_group(trans, dir);
1331 if (IS_ERR(trans)) {
1332 err = PTR_ERR(trans);
1333 goto out_unlock;
1334 }
1335
1336 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1337 if (err) {
1338 err = -ENOSPC;
1339 goto out_unlock;
1340 }
1341
1342 inode = btrfs_new_inode(trans, root, objectid,
1343 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1344 if (IS_ERR(inode)) {
1345 err = PTR_ERR(inode);
1346 goto out_fail;
1347 }
1348 drop_on_err = 1;
1349 inode->i_op = &btrfs_dir_inode_operations;
1350 inode->i_fop = &btrfs_dir_file_operations;
1351 btrfs_set_trans_block_group(trans, inode);
1352
1353 err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
1354 if (err)
1355 goto out_fail;
1356
1357 inode->i_size = 6;
1358 err = btrfs_update_inode(trans, root, inode);
1359 if (err)
1360 goto out_fail;
1361 err = btrfs_add_link(trans, dentry, inode);
1362 if (err)
1363 goto out_fail;
1364 d_instantiate(dentry, inode);
1365 drop_on_err = 0;
1366 dir->i_sb->s_dirt = 1;
1367 btrfs_update_inode_block_group(trans, inode);
1368 btrfs_update_inode_block_group(trans, dir);
1369
1370out_fail:
1371 btrfs_end_transaction(trans, root);
1372out_unlock:
1373 mutex_unlock(&root->fs_info->fs_mutex);
1374 if (drop_on_err)
1375 iput(inode);
1376 btrfs_btree_balance_dirty(root);
1377 return err;
1378}
1379
a52d9a80
CM		 1380struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1381 size_t page_offset, u64 start, u64 end,
1382 int create)
1383{
1384 int ret;
1385 int err = 0;
1386 u64 blocknr;
1387 u64 extent_start = 0;
1388 u64 extent_end = 0;
1389 u64 objectid = inode->i_ino;
1390 u32 found_type;
1391 int failed_insert = 0;
1392 struct btrfs_path *path;
1393 struct btrfs_root *root = BTRFS_I(inode)->root;
1394 struct btrfs_file_extent_item *item;
1395 struct btrfs_leaf *leaf;
1396 struct btrfs_disk_key *found_key;
1397 struct extent_map *em = NULL;
1398 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1399 struct btrfs_trans_handle *trans = NULL;
1400
1401 path = btrfs_alloc_path();
1402 BUG_ON(!path);
1403 mutex_lock(&root->fs_info->fs_mutex);
1404
1405again:
1406 em = lookup_extent_mapping(em_tree, start, end);
1407 if (em) {
1408 goto out;
1409 }
1410 if (!em) {
1411 em = alloc_extent_map(GFP_NOFS);
1412 if (!em) {
1413 err = -ENOMEM;
1414 goto out;
1415 }
1416 em->start = 0;
1417 em->end = 0;
1418 }
1419 em->bdev = inode->i_sb->s_bdev;
1420 ret = btrfs_lookup_file_extent(NULL, root, path,
1421 objectid, start, 0);
1422 if (ret < 0) {
1423 err = ret;
1424 goto out;
1425 }
1426
1427 if (ret != 0) {
1428 if (path->slots[0] == 0)
1429 goto not_found;
1430 path->slots[0]--;
1431 }
1432
1433 item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
1434 struct btrfs_file_extent_item);
1435 leaf = btrfs_buffer_leaf(path->nodes[0]);
1436 blocknr = btrfs_file_extent_disk_blocknr(item);
1437 blocknr += btrfs_file_extent_offset(item);
1438
1439 /* are we inside the extent that was found? */
1440 found_key = &leaf->items[path->slots[0]].key;
1441 found_type = btrfs_disk_key_type(found_key);
1442 if (btrfs_disk_key_objectid(found_key) != objectid ||
1443 found_type != BTRFS_EXTENT_DATA_KEY) {
1444 goto not_found;
1445 }
1446
1447 found_type = btrfs_file_extent_type(item);
1448 extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
1449 if (found_type == BTRFS_FILE_EXTENT_REG) {
1450 extent_end = extent_start +
1451 (btrfs_file_extent_num_blocks(item) << inode->i_blkbits);
1452 err = 0;
b888db2b 1453 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1454 em->start = start;
1455 if (start < extent_start) {
b888db2b
CM		 1456 if (end < extent_start)
1457 goto not_found;
a52d9a80
CM		 1458 em->end = extent_end - 1;
1459 } else {
1460 em->end = end;
1461 }
1462 goto not_found_em;
1463 }
1464 if (btrfs_file_extent_disk_blocknr(item) == 0) {
1465 em->start = extent_start;
1466 em->end = extent_end - 1;
1467 em->block_start = 0;
1468 em->block_end = 0;
1469 goto insert;
1470 }
1471 em->block_start = blocknr << inode->i_blkbits;
1472 em->block_end = em->block_start +
1473 (btrfs_file_extent_num_blocks(item) <<
1474 inode->i_blkbits) - 1;
1475 em->start = extent_start;
1476 em->end = extent_end - 1;
1477 goto insert;
1478 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1479 char *ptr;
1480 char *map;
1481 u32 size;
1482
1483 size = btrfs_file_extent_inline_len(leaf->items +
1484 path->slots[0]);
1485 extent_end = extent_start + size;
b888db2b 1486 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1487 em->start = start;
1488 if (start < extent_start) {
b888db2b
CM		 1489 if (end < extent_start)
1490 goto not_found;
a52d9a80
CM		 1491 em->end = extent_end - 1;
1492 } else {
1493 em->end = end;
1494 }
1495 goto not_found_em;
1496 }
1497 em->block_start = EXTENT_MAP_INLINE;
1498 em->block_end = EXTENT_MAP_INLINE;
1499 em->start = extent_start;
1500 em->end = extent_end - 1;
1501 if (!page) {
1502 goto insert;
1503 }
1504 ptr = btrfs_file_extent_inline_start(item);
1505 map = kmap(page);
1506 memcpy(map + page_offset, ptr, size);
1507 flush_dcache_page(result->b_page);
1508 kunmap(page);
1509 set_extent_uptodate(em_tree, extent_start,
1510 extent_end, GFP_NOFS);
1511 goto insert;
1512 } else {
1513 printk("unkknown found_type %d\n", found_type);
1514 WARN_ON(1);
1515 }
1516not_found:
1517 em->start = start;
1518 em->end = end;
1519not_found_em:
1520 em->block_start = 0;
1521 em->block_end = 0;
1522insert:
1523 btrfs_release_path(root, path);
1524 if (em->start > start || em->end < start) {
b888db2b 1525 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
a52d9a80
CM		 1526 err = -EIO;
1527 goto out;
1528 }
1529 ret = add_extent_mapping(em_tree, em);
1530 if (ret == -EEXIST) {
1531 free_extent_map(em);
1532 failed_insert++;
1533 if (failed_insert > 5) {
1534 printk("failing to insert %Lu %Lu\n", start, end);
1535 err = -EIO;
1536 goto out;
1537 }
1538 em = NULL;
1539 goto again;
1540 }
1541 err = 0;
1542out:
1543 btrfs_free_path(path);
1544 if (trans) {
1545 ret = btrfs_end_transaction(trans, root);
1546 if (!err)
1547 err = ret;
1548 }
1549 mutex_unlock(&root->fs_info->fs_mutex);
1550 if (err) {
1551 free_extent_map(em);
1552 WARN_ON(1);
1553 return ERR_PTR(err);
1554 }
1555 return em;
1556}
1557
1558
39279cc3
CM		 1559/*
1560 * FIBMAP and others want to pass in a fake buffer head. They need to
1561 * use BTRFS_GET_BLOCK_NO_DIRECT to make sure we don't try to memcpy
1562 * any packed file data into the fake bh
1563 */
1564#define BTRFS_GET_BLOCK_NO_CREATE 0
1565#define BTRFS_GET_BLOCK_CREATE 1
1566#define BTRFS_GET_BLOCK_NO_DIRECT 2
1567
1568/*
1569 * FIXME create==1 doe not work.
1570 */
1571static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
1572 struct buffer_head *result, int create)
1573{
1574 int ret;
1575 int err = 0;
1576 u64 blocknr;
1577 u64 extent_start = 0;
1578 u64 extent_end = 0;
1579 u64 objectid = inode->i_ino;
1580 u32 found_type;
1581 u64 alloc_hint = 0;
1582 struct btrfs_path *path;
1583 struct btrfs_root *root = BTRFS_I(inode)->root;
1584 struct btrfs_file_extent_item *item;
1585 struct btrfs_leaf *leaf;
1586 struct btrfs_disk_key *found_key;
1587 struct btrfs_trans_handle *trans = NULL;
1588
1589 path = btrfs_alloc_path();
1590 BUG_ON(!path);
39279cc3 1591 if (create & BTRFS_GET_BLOCK_CREATE) {
9ebefb18
CM		 1592 /*
1593 * danger!, this only works if the page is properly up
1594 * to date somehow
1595 */
39279cc3
CM		 1596 trans = btrfs_start_transaction(root, 1);
1597 if (!trans) {
1598 err = -ENOMEM;
1599 goto out;
1600 }
1601 ret = btrfs_drop_extents(trans, root, inode,
1602 iblock << inode->i_blkbits,
1603 (iblock + 1) << inode->i_blkbits,
1604 &alloc_hint);
1605 BUG_ON(ret);
1606 }
1607
1608 ret = btrfs_lookup_file_extent(NULL, root, path,
f1ace244 1609 objectid,
39279cc3
CM		 1610 iblock << inode->i_blkbits, 0);
1611 if (ret < 0) {
1612 err = ret;
1613 goto out;
1614 }
1615
1616 if (ret != 0) {
1617 if (path->slots[0] == 0) {
1618 btrfs_release_path(root, path);
1619 goto not_found;
1620 }
1621 path->slots[0]--;
1622 }
1623
1624 item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
1625 struct btrfs_file_extent_item);
1626 leaf = btrfs_buffer_leaf(path->nodes[0]);
1627 blocknr = btrfs_file_extent_disk_blocknr(item);
1628 blocknr += btrfs_file_extent_offset(item);
1629
1630 /* are we inside the extent that was found? */
1631 found_key = &leaf->items[path->slots[0]].key;
1632 found_type = btrfs_disk_key_type(found_key);
1633 if (btrfs_disk_key_objectid(found_key) != objectid ||
1634 found_type != BTRFS_EXTENT_DATA_KEY) {
1635 extent_end = 0;
1636 extent_start = 0;
1637 goto not_found;
1638 }
1639 found_type = btrfs_file_extent_type(item);
1640 extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
1641 if (found_type == BTRFS_FILE_EXTENT_REG) {
1642 extent_start = extent_start >> inode->i_blkbits;
1643 extent_end = extent_start + btrfs_file_extent_num_blocks(item);
1644 err = 0;
1645 if (btrfs_file_extent_disk_blocknr(item) == 0)
1646 goto out;
1647 if (iblock >= extent_start && iblock < extent_end) {
1648 btrfs_map_bh_to_logical(root, result, blocknr +
1649 iblock - extent_start);
1650 goto out;
1651 }
1652 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1653 char *ptr;
1654 char *map;
1655 u32 size;
1656
1657 if (create & BTRFS_GET_BLOCK_NO_DIRECT) {
1658 err = -EINVAL;
1659 goto out;
1660 }
1661 size = btrfs_file_extent_inline_len(leaf->items +
1662 path->slots[0]);
1663 extent_end = (extent_start + size) >> inode->i_blkbits;
1664 extent_start >>= inode->i_blkbits;
1665 if (iblock < extent_start || iblock > extent_end) {
1666 goto not_found;
1667 }
1668 ptr = btrfs_file_extent_inline_start(item);
1669 map = kmap(result->b_page);
1670 memcpy(map, ptr, size);
1671 memset(map + size, 0, PAGE_CACHE_SIZE - size);
1672 flush_dcache_page(result->b_page);
1673 kunmap(result->b_page);
1674 set_buffer_uptodate(result);
1675 SetPageChecked(result->b_page);
1676 btrfs_map_bh_to_logical(root, result, 0);
1677 }
1678not_found:
1679 if (create & BTRFS_GET_BLOCK_CREATE) {
1680 struct btrfs_key ins;
1681 ret = btrfs_alloc_extent(trans, root, inode->i_ino,
6702ed49 1682 1, 0, alloc_hint, (u64)-1,
39279cc3 1683 &ins, 1);
54aa1f4d
CM		 1684 if (ret) {
1685 err = ret;
1686 goto out;
1687 }
39279cc3
CM		 1688 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
1689 iblock << inode->i_blkbits,
1690 ins.objectid, ins.offset,
1691 ins.offset);
54aa1f4d
CM		 1692 if (ret) {
1693 err = ret;
1694 goto out;
1695 }
39279cc3
CM		 1696 btrfs_map_bh_to_logical(root, result, ins.objectid);
1697 }
1698out:
54aa1f4d
CM		 1699 if (trans) {
1700 ret = btrfs_end_transaction(trans, root);
1701 if (!err)
1702 err = ret;
1703 }
39279cc3
CM		 1704 btrfs_free_path(path);
1705 return err;
1706}
1707
1708int btrfs_get_block(struct inode *inode, sector_t iblock,
1709 struct buffer_head *result, int create)
1710{
1711 int err;
1712 struct btrfs_root *root = BTRFS_I(inode)->root;
1713 mutex_lock(&root->fs_info->fs_mutex);
1714 err = btrfs_get_block_lock(inode, iblock, result, create);
1715 mutex_unlock(&root->fs_info->fs_mutex);
1716 return err;
1717}
1718
1719static int btrfs_get_block_bmap(struct inode *inode, sector_t iblock,
1720 struct buffer_head *result, int create)
1721{
1722 struct btrfs_root *root = BTRFS_I(inode)->root;
a52d9a80
CM		 1723 u64 start = iblock << inode->i_blkbits;
1724 u64 end = start + root->blocksize -1;
1725 struct extent_map *em;
1726
1727 em = btrfs_get_extent(inode, NULL, 0, start, end, 0);
1728 if (em && !IS_ERR(em) && em->block_start != EXTENT_MAP_INLINE &&
1729 em->block_start != 0) {
1730 u64 offset;
1731 offset = start - em->start;
1732 start = (em->block_start + offset) >> inode->i_blkbits;
1733 btrfs_map_bh_to_logical(root, result, start);
1734 }
39279cc3
CM		 1735 return 0;
1736}
1737
1738static sector_t btrfs_bmap(struct address_space *as, sector_t block)
1739{
1740 return generic_block_bmap(as, block, btrfs_get_block_bmap);
1741}
1742
1743static int btrfs_prepare_write(struct file *file, struct page *page,
1744 unsigned from, unsigned to)
1745{
a52d9a80
CM		 1746 return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree,
1747 page->mapping->host, page, from, to,
1748 btrfs_get_extent);
39279cc3
CM		 1749}
1750
a52d9a80 1751int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 1752{
a52d9a80
CM		 1753 struct extent_map_tree *tree;
1754 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1755 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 1756}
a52d9a80 1757static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 1758{
a52d9a80 1759 struct extent_map_tree *tree;
b888db2b
CM		 1760
1761
1762 if (current->flags & PF_MEMALLOC) {
1763 redirty_page_for_writepage(wbc, page);
1764 unlock_page(page);
1765 return 0;
1766 }
a52d9a80
CM		 1767 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1768 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 1769}
1770
a52d9a80 1771static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
9ebefb18 1772{
a52d9a80
CM		 1773 struct extent_map_tree *tree;
1774 int ret;
8c2383c3 1775
a52d9a80
CM		 1776 if (page->private != 1) {
1777 WARN_ON(1);
1778 return try_to_free_buffers(page);
39279cc3 1779 }
a52d9a80
CM		 1780 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1781 ret = try_release_extent_mapping(tree, page);
1782 if (ret == 1) {
1783 ClearPagePrivate(page);
1784 set_page_private(page, 0);
1785 page_cache_release(page);
39279cc3 1786 }
a52d9a80 1787 return ret;
39279cc3
CM		 1788}
1789
a52d9a80 1790static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 1791{
a52d9a80 1792 struct extent_map_tree *tree;
39279cc3 1793
a52d9a80
CM		 1794 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1795 extent_invalidatepage(tree, page, offset);
1796 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 1797}
1798
9ebefb18
CM		 1799/*
1800 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1801 * called from a page fault handler when a page is first dirtied. Hence we must
1802 * be careful to check for EOF conditions here. We set the page up correctly
1803 * for a written page which means we get ENOSPC checking when writing into
1804 * holes and correct delalloc and unwritten extent mapping on filesystems that
1805 * support these features.
1806 *
1807 * We are not allowed to take the i_mutex here so we have to play games to
1808 * protect against truncate races as the page could now be beyond EOF. Because
1809 * vmtruncate() writes the inode size before removing pages, once we have the
1810 * page lock we can determine safely if the page is beyond EOF. If it is not
1811 * beyond EOF, then the page is guaranteed safe against truncation until we
1812 * unlock the page.
1813 */
1814int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
1815{
1816 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
1817 unsigned long end;
1818 loff_t size;
1819 int ret = -EINVAL;
a52d9a80 1820 u64 page_start;
9ebefb18
CM		 1821
1822 lock_page(page);
1823 wait_on_page_writeback(page);
9ebefb18 1824 size = i_size_read(inode);
a52d9a80
CM		 1825 page_start = page->index << PAGE_CACHE_SHIFT;
1826
9ebefb18 1827 if ((page->mapping != inode->i_mapping) ||
a52d9a80 1828 (page_start > size)) {
9ebefb18
CM		 1829 /* page got truncated out from underneath us */
1830 goto out_unlock;
1831 }
1832
1833 /* page is wholly or partially inside EOF */
a52d9a80 1834 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 1835 end = size & ~PAGE_CACHE_MASK;
1836 else
1837 end = PAGE_CACHE_SIZE;
1838
b888db2b 1839 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 1840
1841out_unlock:
1842 unlock_page(page);
1843 return ret;
1844}
1845
39279cc3
CM		 1846static void btrfs_truncate(struct inode *inode)
1847{
1848 struct btrfs_root *root = BTRFS_I(inode)->root;
1849 int ret;
1850 struct btrfs_trans_handle *trans;
1851
1852 if (!S_ISREG(inode->i_mode))
1853 return;
1854 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1855 return;
1856
1857 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1858
1859 mutex_lock(&root->fs_info->fs_mutex);
1860 trans = btrfs_start_transaction(root, 1);
1861 btrfs_set_trans_block_group(trans, inode);
1862
1863 /* FIXME, add redo link to tree so we don't leak on crash */
1864 ret = btrfs_truncate_in_trans(trans, root, inode);
39279cc3
CM		 1865 btrfs_update_inode(trans, root, inode);
1866 ret = btrfs_end_transaction(trans, root);
1867 BUG_ON(ret);
1868 mutex_unlock(&root->fs_info->fs_mutex);
1869 btrfs_btree_balance_dirty(root);
1870}
1871
1872int btrfs_commit_write(struct file *file, struct page *page,
1873 unsigned from, unsigned to)
1874{
a52d9a80
CM		 1875 return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree,
1876 page->mapping->host, page, from, to);
39279cc3
CM		 1877}
1878
1879static int create_subvol(struct btrfs_root *root, char *name, int namelen)
1880{
1881 struct btrfs_trans_handle *trans;
1882 struct btrfs_key key;
1883 struct btrfs_root_item root_item;
1884 struct btrfs_inode_item *inode_item;
1885 struct buffer_head *subvol;
1886 struct btrfs_leaf *leaf;
1887 struct btrfs_root *new_root;
1888 struct inode *inode;
1889 struct inode *dir;
1890 int ret;
54aa1f4d 1891 int err;
39279cc3
CM		 1892 u64 objectid;
1893 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
1894
1895 mutex_lock(&root->fs_info->fs_mutex);
1896 trans = btrfs_start_transaction(root, 1);
1897 BUG_ON(!trans);
1898
6702ed49 1899 subvol = btrfs_alloc_free_block(trans, root, 0, 0);
54aa1f4d
CM		 1900 if (IS_ERR(subvol))
1901 return PTR_ERR(subvol);
39279cc3
CM		 1902 leaf = btrfs_buffer_leaf(subvol);
1903 btrfs_set_header_nritems(&leaf->header, 0);
1904 btrfs_set_header_level(&leaf->header, 0);
1905 btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol));
1906 btrfs_set_header_generation(&leaf->header, trans->transid);
1907 btrfs_set_header_owner(&leaf->header, root->root_key.objectid);
1908 memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
1909 sizeof(leaf->header.fsid));
ccd467d6 1910 btrfs_mark_buffer_dirty(subvol);
39279cc3
CM		 1911
1912 inode_item = &root_item.inode;
1913 memset(inode_item, 0, sizeof(*inode_item));
1914 btrfs_set_inode_generation(inode_item, 1);
1915 btrfs_set_inode_size(inode_item, 3);
1916 btrfs_set_inode_nlink(inode_item, 1);
1917 btrfs_set_inode_nblocks(inode_item, 1);
1918 btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
1919
1920 btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
1921 btrfs_set_root_refs(&root_item, 1);
58176a96 1922 btrfs_set_root_blocks_used(&root_item, 0);
5eda7b5e
CM		 1923 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
1924 root_item.drop_level = 0;
39279cc3
CM		 1925 brelse(subvol);
1926 subvol = NULL;
1927
1928 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
1929 0, &objectid);
54aa1f4d
CM		 1930 if (ret)
1931 goto fail;
39279cc3
CM		 1932
1933 btrfs_set_root_dirid(&root_item, new_dirid);
1934
1935 key.objectid = objectid;
1936 key.offset = 1;
1937 key.flags = 0;
1938 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
1939 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
1940 &root_item);
54aa1f4d
CM		 1941 if (ret)
1942 goto fail;
39279cc3
CM		 1943
1944 /*
1945 * insert the directory item
1946 */
1947 key.offset = (u64)-1;
1948 dir = root->fs_info->sb->s_root->d_inode;
1949 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
1950 name, namelen, dir->i_ino, &key,
1951 BTRFS_FT_DIR);
54aa1f4d
CM		 1952 if (ret)
1953 goto fail;
39279cc3
CM		 1954
1955 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 1956 if (ret)
1957 goto fail_commit;
39279cc3 1958
58176a96 1959 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 1960 BUG_ON(!new_root);
1961
1962 trans = btrfs_start_transaction(new_root, 1);
1963 BUG_ON(!trans);
1964
1965 inode = btrfs_new_inode(trans, new_root, new_dirid,
1966 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 1967 if (IS_ERR(inode))
1968 goto fail;
39279cc3
CM		 1969 inode->i_op = &btrfs_dir_inode_operations;
1970 inode->i_fop = &btrfs_dir_file_operations;
34088780 1971 new_root->inode = inode;
39279cc3
CM		 1972
1973 ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
54aa1f4d
CM		 1974 if (ret)
1975 goto fail;
39279cc3
CM		 1976
1977 inode->i_nlink = 1;
1978 inode->i_size = 6;
1979 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 1980 if (ret)
1981 goto fail;
1982fail:
1983 err = btrfs_commit_transaction(trans, root);
1984 if (err && !ret)
1985 ret = err;
1986fail_commit:
39279cc3
CM		 1987 mutex_unlock(&root->fs_info->fs_mutex);
1988 btrfs_btree_balance_dirty(root);
54aa1f4d 1989 return ret;
39279cc3
CM		 1990}
1991
1992static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
1993{
1994 struct btrfs_trans_handle *trans;
1995 struct btrfs_key key;
1996 struct btrfs_root_item new_root_item;
83df7c1d 1997 struct buffer_head *tmp;
39279cc3 1998 int ret;
54aa1f4d 1999 int err;
39279cc3
CM		 2000 u64 objectid;
2001
2002 if (!root->ref_cows)
2003 return -EINVAL;
2004
2005 mutex_lock(&root->fs_info->fs_mutex);
2006 trans = btrfs_start_transaction(root, 1);
2007 BUG_ON(!trans);
2008
2009 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d
CM		 2010 if (ret)
2011 goto fail;
39279cc3
CM		 2012
2013 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2014 0, &objectid);
54aa1f4d
CM		 2015 if (ret)
2016 goto fail;
39279cc3
CM		 2017
2018 memcpy(&new_root_item, &root->root_item,
2019 sizeof(new_root_item));
2020
2021 key.objectid = objectid;
2022 key.offset = 1;
2023 key.flags = 0;
2024 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
83df7c1d 2025 btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
39279cc3
CM		 2026 btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node));
2027
2028 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2029 &new_root_item);
54aa1f4d
CM		 2030 if (ret)
2031 goto fail;
39279cc3
CM		 2032
2033 /*
2034 * insert the directory item
2035 */
2036 key.offset = (u64)-1;
2037 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2038 name, namelen,
2039 root->fs_info->sb->s_root->d_inode->i_ino,
2040 &key, BTRFS_FT_DIR);
2041
54aa1f4d
CM		 2042 if (ret)
2043 goto fail;
39279cc3
CM		 2044
2045 ret = btrfs_inc_root_ref(trans, root);
54aa1f4d
CM		 2046 if (ret)
2047 goto fail;
39279cc3 2048
54aa1f4d
CM		 2049fail:
2050 err = btrfs_commit_transaction(trans, root);
2051 if (err && !ret)
2052 ret = err;
39279cc3
CM		 2053 mutex_unlock(&root->fs_info->fs_mutex);
2054 btrfs_btree_balance_dirty(root);
54aa1f4d 2055 return ret;
39279cc3
CM		 2056}
2057
2058int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
2059 cmd, unsigned long arg)
2060{
2061 struct btrfs_root *root = BTRFS_I(inode)->root;
2062 struct btrfs_ioctl_vol_args vol_args;
2063 int ret = 0;
2064 struct btrfs_dir_item *di;
2065 int namelen;
2066 struct btrfs_path *path;
2067 u64 root_dirid;
2068
2069 switch (cmd) {
2070 case BTRFS_IOC_SNAP_CREATE:
2071 if (copy_from_user(&vol_args,
2072 (struct btrfs_ioctl_vol_args __user *)arg,
2073 sizeof(vol_args)))
2074 return -EFAULT;
2075 namelen = strlen(vol_args.name);
2076 if (namelen > BTRFS_VOL_NAME_MAX)
2077 return -EINVAL;
8a712645
CM		 2078 if (strchr(vol_args.name, '/'))
2079 return -EINVAL;
39279cc3
CM		 2080 path = btrfs_alloc_path();
2081 if (!path)
2082 return -ENOMEM;
2083 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2084 mutex_lock(&root->fs_info->fs_mutex);
2085 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2086 path, root_dirid,
2087 vol_args.name, namelen, 0);
2088 mutex_unlock(&root->fs_info->fs_mutex);
2089 btrfs_free_path(path);
2090 if (di && !IS_ERR(di))
2091 return -EEXIST;
54aa1f4d
CM		 2092 if (IS_ERR(di))
2093 return PTR_ERR(di);
39279cc3
CM		 2094
2095 if (root == root->fs_info->tree_root)
2096 ret = create_subvol(root, vol_args.name, namelen);
2097 else
2098 ret = create_snapshot(root, vol_args.name, namelen);
39279cc3 2099 break;
6702ed49
CM		 2100
2101 case BTRFS_IOC_DEFRAG:
2102 mutex_lock(&root->fs_info->fs_mutex);
e9d0b13b
CM		 2103 btrfs_defrag_root(root, 0);
2104 btrfs_defrag_root(root->fs_info->extent_root, 0);
6702ed49
CM		 2105 mutex_unlock(&root->fs_info->fs_mutex);
2106 ret = 0;
2107 break;
39279cc3
CM		 2108 default:
2109 return -ENOTTY;
2110 }
2111 return ret;
2112}
2113
2114#ifdef CONFIG_COMPAT
2115long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
2116 unsigned long arg)
2117{
2118 struct inode *inode = file->f_path.dentry->d_inode;
2119 int ret;
2120 lock_kernel();
2121 ret = btrfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
2122 unlock_kernel();
2123 return ret;
2124
2125}
2126#endif
2127
2128/*
2129 * Called inside transaction, so use GFP_NOFS
2130 */
2131struct inode *btrfs_alloc_inode(struct super_block *sb)
2132{
2133 struct btrfs_inode *ei;
2134
2135 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2136 if (!ei)
2137 return NULL;
15ee9bc7 2138 ei->last_trans = 0;
39279cc3
CM		 2139 return &ei->vfs_inode;
2140}
2141
2142void btrfs_destroy_inode(struct inode *inode)
2143{
2144 WARN_ON(!list_empty(&inode->i_dentry));
2145 WARN_ON(inode->i_data.nrpages);
2146
2147 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2148}
2149
2150static void init_once(void * foo, struct kmem_cache * cachep,
2151 unsigned long flags)
2152{
2153 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2154
2155 inode_init_once(&ei->vfs_inode);
2156}
2157
2158void btrfs_destroy_cachep(void)
2159{
2160 if (btrfs_inode_cachep)
2161 kmem_cache_destroy(btrfs_inode_cachep);
2162 if (btrfs_trans_handle_cachep)
2163 kmem_cache_destroy(btrfs_trans_handle_cachep);
2164 if (btrfs_transaction_cachep)
2165 kmem_cache_destroy(btrfs_transaction_cachep);
2166 if (btrfs_bit_radix_cachep)
2167 kmem_cache_destroy(btrfs_bit_radix_cachep);
2168 if (btrfs_path_cachep)
2169 kmem_cache_destroy(btrfs_path_cachep);
2170}
2171
92fee66d
CM		 2172static struct kmem_cache *cache_create(const char *name, size_t size,
2173 unsigned long extra_flags,
2174 void (*ctor)(void *, struct kmem_cache *,
2175 unsigned long))
2176{
2177 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2178 SLAB_MEM_SPREAD | extra_flags), ctor
2179#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2180 ,NULL
2181#endif
2182 );
2183}
2184
39279cc3
CM		 2185int btrfs_init_cachep(void)
2186{
92fee66d
CM		 2187 btrfs_inode_cachep = cache_create("btrfs_inode_cache",
2188 sizeof(struct btrfs_inode),
2189 0, init_once);
39279cc3
CM		 2190 if (!btrfs_inode_cachep)
2191 goto fail;
92fee66d 2192 btrfs_trans_handle_cachep = cache_create("btrfs_trans_handle_cache",
39279cc3 2193 sizeof(struct btrfs_trans_handle),
92fee66d 2194 0, NULL);
39279cc3
CM		 2195 if (!btrfs_trans_handle_cachep)
2196 goto fail;
92fee66d 2197 btrfs_transaction_cachep = cache_create("btrfs_transaction_cache",
39279cc3 2198 sizeof(struct btrfs_transaction),
92fee66d 2199 0, NULL);
39279cc3
CM		 2200 if (!btrfs_transaction_cachep)
2201 goto fail;
92fee66d
CM		 2202 btrfs_path_cachep = cache_create("btrfs_path_cache",
2203 sizeof(struct btrfs_transaction),
2204 0, NULL);
39279cc3
CM		 2205 if (!btrfs_path_cachep)
2206 goto fail;
92fee66d
CM		 2207 btrfs_bit_radix_cachep = cache_create("btrfs_radix", 256,
2208 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 2209 if (!btrfs_bit_radix_cachep)
2210 goto fail;
2211 return 0;
2212fail:
2213 btrfs_destroy_cachep();
2214 return -ENOMEM;
2215}
2216
2217static int btrfs_getattr(struct vfsmount *mnt,
2218 struct dentry *dentry, struct kstat *stat)
2219{
2220 struct inode *inode = dentry->d_inode;
2221 generic_fillattr(inode, stat);
2222 stat->blksize = 256 * 1024;
2223 return 0;
2224}
2225
2226static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2227 struct inode * new_dir,struct dentry *new_dentry)
2228{
2229 struct btrfs_trans_handle *trans;
2230 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2231 struct inode *new_inode = new_dentry->d_inode;
2232 struct inode *old_inode = old_dentry->d_inode;
2233 struct timespec ctime = CURRENT_TIME;
2234 struct btrfs_path *path;
2235 struct btrfs_dir_item *di;
2236 int ret;
2237
2238 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2239 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2240 return -ENOTEMPTY;
2241 }
2242 mutex_lock(&root->fs_info->fs_mutex);
2243 trans = btrfs_start_transaction(root, 1);
2244 btrfs_set_trans_block_group(trans, new_dir);
2245 path = btrfs_alloc_path();
2246 if (!path) {
2247 ret = -ENOMEM;
2248 goto out_fail;
2249 }
2250
2251 old_dentry->d_inode->i_nlink++;
2252 old_dir->i_ctime = old_dir->i_mtime = ctime;
2253 new_dir->i_ctime = new_dir->i_mtime = ctime;
2254 old_inode->i_ctime = ctime;
2255 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
2256 struct btrfs_key *location = &BTRFS_I(new_dir)->location;
2257 u64 old_parent_oid;
2258 di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
2259 "..", 2, -1);
2260 if (IS_ERR(di)) {
2261 ret = PTR_ERR(di);
2262 goto out_fail;
2263 }
2264 if (!di) {
2265 ret = -ENOENT;
2266 goto out_fail;
2267 }
2268 old_parent_oid = btrfs_disk_key_objectid(&di->location);
2269 ret = btrfs_del_item(trans, root, path);
2270 if (ret) {
39279cc3
CM		 2271 goto out_fail;
2272 }
2273 btrfs_release_path(root, path);
2274
2275 di = btrfs_lookup_dir_index_item(trans, root, path,
2276 old_inode->i_ino,
2277 old_parent_oid,
2278 "..", 2, -1);
2279 if (IS_ERR(di)) {
2280 ret = PTR_ERR(di);
2281 goto out_fail;
2282 }
2283 if (!di) {
2284 ret = -ENOENT;
2285 goto out_fail;
2286 }
2287 ret = btrfs_del_item(trans, root, path);
2288 if (ret) {
39279cc3
CM		 2289 goto out_fail;
2290 }
2291 btrfs_release_path(root, path);
2292
2293 ret = btrfs_insert_dir_item(trans, root, "..", 2,
2294 old_inode->i_ino, location,
2295 BTRFS_FT_DIR);
2296 if (ret)
2297 goto out_fail;
2298 }
2299
2300
2301 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2302 if (ret)
2303 goto out_fail;
2304
2305 if (new_inode) {
2306 new_inode->i_ctime = CURRENT_TIME;
2307 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2308 if (ret)
2309 goto out_fail;
2310 if (S_ISDIR(new_inode->i_mode))
2311 clear_nlink(new_inode);
2312 else
2313 drop_nlink(new_inode);
54aa1f4d
CM		 2314 ret = btrfs_update_inode(trans, root, new_inode);
2315 if (ret)
2316 goto out_fail;
39279cc3
CM		 2317 }
2318 ret = btrfs_add_link(trans, new_dentry, old_inode);
2319 if (ret)
2320 goto out_fail;
2321
2322out_fail:
2323 btrfs_free_path(path);
2324 btrfs_end_transaction(trans, root);
2325 mutex_unlock(&root->fs_info->fs_mutex);
2326 return ret;
2327}
2328
2329static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2330 const char *symname)
2331{
2332 struct btrfs_trans_handle *trans;
2333 struct btrfs_root *root = BTRFS_I(dir)->root;
2334 struct btrfs_path *path;
2335 struct btrfs_key key;
2336 struct inode *inode;
2337 int err;
2338 int drop_inode = 0;
2339 u64 objectid;
2340 int name_len;
2341 int datasize;
2342 char *ptr;
2343 struct btrfs_file_extent_item *ei;
2344
2345 name_len = strlen(symname) + 1;
2346 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2347 return -ENAMETOOLONG;
2348 mutex_lock(&root->fs_info->fs_mutex);
2349 trans = btrfs_start_transaction(root, 1);
2350 btrfs_set_trans_block_group(trans, dir);
2351
2352 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2353 if (err) {
2354 err = -ENOSPC;
2355 goto out_unlock;
2356 }
2357
2358 inode = btrfs_new_inode(trans, root, objectid,
2359 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2360 err = PTR_ERR(inode);
2361 if (IS_ERR(inode))
2362 goto out_unlock;
2363
2364 btrfs_set_trans_block_group(trans, inode);
2365 err = btrfs_add_nondir(trans, dentry, inode);
2366 if (err)
2367 drop_inode = 1;
2368 else {
2369 inode->i_mapping->a_ops = &btrfs_aops;
2370 inode->i_fop = &btrfs_file_operations;
2371 inode->i_op = &btrfs_file_inode_operations;
a52d9a80
CM		 2372 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2373 inode->i_mapping, GFP_NOFS);
07157aac 2374 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 2375 }
2376 dir->i_sb->s_dirt = 1;
2377 btrfs_update_inode_block_group(trans, inode);
2378 btrfs_update_inode_block_group(trans, dir);
2379 if (drop_inode)
2380 goto out_unlock;
2381
2382 path = btrfs_alloc_path();
2383 BUG_ON(!path);
2384 key.objectid = inode->i_ino;
2385 key.offset = 0;
2386 key.flags = 0;
2387 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2388 datasize = btrfs_file_extent_calc_inline_size(name_len);
2389 err = btrfs_insert_empty_item(trans, root, path, &key,
2390 datasize);
54aa1f4d
CM		 2391 if (err) {
2392 drop_inode = 1;
2393 goto out_unlock;
2394 }
39279cc3
CM		 2395 ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
2396 path->slots[0], struct btrfs_file_extent_item);
2397 btrfs_set_file_extent_generation(ei, trans->transid);
2398 btrfs_set_file_extent_type(ei,
2399 BTRFS_FILE_EXTENT_INLINE);
2400 ptr = btrfs_file_extent_inline_start(ei);
2401 btrfs_memcpy(root, path->nodes[0]->b_data,
2402 ptr, symname, name_len);
ccd467d6 2403 btrfs_mark_buffer_dirty(path->nodes[0]);
39279cc3
CM		 2404 btrfs_free_path(path);
2405 inode->i_op = &btrfs_symlink_inode_operations;
2406 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2407 inode->i_size = name_len - 1;
54aa1f4d
CM		 2408 err = btrfs_update_inode(trans, root, inode);
2409 if (err)
2410 drop_inode = 1;
39279cc3
CM		 2411
2412out_unlock:
2413 btrfs_end_transaction(trans, root);
2414 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 2415 if (drop_inode) {
2416 inode_dec_link_count(inode);
2417 iput(inode);
2418 }
2419 btrfs_btree_balance_dirty(root);
2420 return err;
2421}
2422
2423static struct inode_operations btrfs_dir_inode_operations = {
2424 .lookup = btrfs_lookup,
2425 .create = btrfs_create,
2426 .unlink = btrfs_unlink,
2427 .link = btrfs_link,
2428 .mkdir = btrfs_mkdir,
2429 .rmdir = btrfs_rmdir,
2430 .rename = btrfs_rename,
2431 .symlink = btrfs_symlink,
2432 .setattr = btrfs_setattr,
618e21d5 2433 .mknod = btrfs_mknod,
39279cc3
CM		 2434};
2435
2436static struct inode_operations btrfs_dir_ro_inode_operations = {
2437 .lookup = btrfs_lookup,
2438};
2439
2440static struct file_operations btrfs_dir_file_operations = {
2441 .llseek = generic_file_llseek,
2442 .read = generic_read_dir,
2443 .readdir = btrfs_readdir,
2444 .ioctl = btrfs_ioctl,
2445#ifdef CONFIG_COMPAT
2446 .compat_ioctl = btrfs_compat_ioctl,
2447#endif
2448};
2449
07157aac
CM		 2450static struct extent_map_ops btrfs_extent_map_ops = {
2451 .fill_delalloc = run_delalloc_range,
2452 .writepage_io_hook = btrfs_writepage_io_hook,
2453 .readpage_io_hook = btrfs_readpage_io_hook,
2454 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2455};
2456
39279cc3
CM		 2457static struct address_space_operations btrfs_aops = {
2458 .readpage = btrfs_readpage,
2459 .writepage = btrfs_writepage,
2460 .sync_page = block_sync_page,
2461 .prepare_write = btrfs_prepare_write,
2462 .commit_write = btrfs_commit_write,
2463 .bmap = btrfs_bmap,
a52d9a80
CM		 2464 .invalidatepage = btrfs_invalidatepage,
2465 .releasepage = btrfs_releasepage,
2466 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 2467};
2468
2469static struct address_space_operations btrfs_symlink_aops = {
2470 .readpage = btrfs_readpage,
2471 .writepage = btrfs_writepage,
2472};
2473
2474static struct inode_operations btrfs_file_inode_operations = {
2475 .truncate = btrfs_truncate,
2476 .getattr = btrfs_getattr,
2477 .setattr = btrfs_setattr,
2478};
2479
618e21d5
JB		 2480static struct inode_operations btrfs_special_inode_operations = {
2481 .getattr = btrfs_getattr,
2482 .setattr = btrfs_setattr,
2483};
2484
39279cc3
CM		 2485static struct inode_operations btrfs_symlink_inode_operations = {
2486 .readlink = generic_readlink,
2487 .follow_link = page_follow_link_light,
2488 .put_link = page_put_link,
2489};
Linux kernel - Deliverables
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