2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #include <linux/buffer_head.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>
38 #include "transaction.h"
39 #include "btrfs_inode.h"
41 #include "print-tree.h"
43 struct btrfs_iget_args {
45 struct btrfs_root *root;
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;
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;
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,
75 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
77 struct btrfs_root *root = BTRFS_I(inode)->root;
78 struct btrfs_trans_handle *trans;
83 u64 blocksize = root->sectorsize;
85 mutex_lock(&root->fs_info->fs_mutex);
86 trans = btrfs_start_transaction(root, 1);
87 btrfs_set_trans_block_group(trans, inode);
89 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
90 ret = btrfs_drop_extents(trans, root, inode,
91 start, start + num_bytes, start, &alloc_hint);
93 if (alloc_hint == EXTENT_MAP_INLINE)
96 ret = btrfs_alloc_extent(trans, root, num_bytes,
97 root->root_key.objectid, trans->transid,
98 inode->i_ino, start, 0,
99 alloc_hint, (u64)-1, &ins, 1);
104 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
105 start, ins.objectid, ins.offset,
108 btrfs_end_transaction(trans, root);
109 mutex_unlock(&root->fs_info->fs_mutex);
113 int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
115 struct inode *inode = page->mapping->host;
116 struct btrfs_root *root = BTRFS_I(inode)->root;
117 struct btrfs_trans_handle *trans;
120 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
121 size_t offset = start - page_start;
123 mutex_lock(&root->fs_info->fs_mutex);
124 trans = btrfs_start_transaction(root, 1);
125 btrfs_set_trans_block_group(trans, inode);
127 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
128 start, kaddr + offset, end - start + 1);
130 ret = btrfs_end_transaction(trans, root);
132 mutex_unlock(&root->fs_info->fs_mutex);
136 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
139 struct inode *inode = page->mapping->host;
140 struct btrfs_root *root = BTRFS_I(inode)->root;
141 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
142 struct btrfs_csum_item *item;
143 struct btrfs_path *path = NULL;
146 mutex_lock(&root->fs_info->fs_mutex);
147 path = btrfs_alloc_path();
148 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
151 /* a csum that isn't present is a preallocated region. */
152 if (ret == -ENOENT || ret == -EFBIG)
157 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
159 set_state_private(em_tree, start, csum);
162 btrfs_free_path(path);
163 mutex_unlock(&root->fs_info->fs_mutex);
167 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
169 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
170 struct inode *inode = page->mapping->host;
171 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
175 struct btrfs_root *root = BTRFS_I(inode)->root;
179 ret = get_state_private(em_tree, start, &private);
180 local_irq_save(flags);
181 kaddr = kmap_atomic(page, KM_IRQ0);
185 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
186 btrfs_csum_final(csum, (char *)&csum);
187 if (csum != private) {
190 kunmap_atomic(kaddr, KM_IRQ0);
191 local_irq_restore(flags);
195 printk("btrfs csum failed ino %lu off %llu\n",
196 page->mapping->host->i_ino, (unsigned long long)start);
197 memset(kaddr + offset, 1, end - start + 1);
198 flush_dcache_page(page);
199 kunmap_atomic(kaddr, KM_IRQ0);
200 local_irq_restore(flags);
204 void btrfs_read_locked_inode(struct inode *inode)
206 struct btrfs_path *path;
207 struct extent_buffer *leaf;
208 struct btrfs_inode_item *inode_item;
209 struct btrfs_inode_timespec *tspec;
210 struct btrfs_root *root = BTRFS_I(inode)->root;
211 struct btrfs_key location;
212 u64 alloc_group_block;
216 path = btrfs_alloc_path();
218 mutex_lock(&root->fs_info->fs_mutex);
220 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
221 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
225 leaf = path->nodes[0];
226 inode_item = btrfs_item_ptr(leaf, path->slots[0],
227 struct btrfs_inode_item);
229 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
230 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
231 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
232 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
233 inode->i_size = btrfs_inode_size(leaf, inode_item);
235 tspec = btrfs_inode_atime(inode_item);
236 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
237 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
239 tspec = btrfs_inode_mtime(inode_item);
240 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
241 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
243 tspec = btrfs_inode_ctime(inode_item);
244 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
245 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
247 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
248 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
250 rdev = btrfs_inode_rdev(leaf, inode_item);
252 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
253 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
256 btrfs_free_path(path);
259 mutex_unlock(&root->fs_info->fs_mutex);
261 switch (inode->i_mode & S_IFMT) {
263 inode->i_mapping->a_ops = &btrfs_aops;
264 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
265 inode->i_fop = &btrfs_file_operations;
266 inode->i_op = &btrfs_file_inode_operations;
269 inode->i_fop = &btrfs_dir_file_operations;
270 if (root == root->fs_info->tree_root)
271 inode->i_op = &btrfs_dir_ro_inode_operations;
273 inode->i_op = &btrfs_dir_inode_operations;
276 inode->i_op = &btrfs_symlink_inode_operations;
277 inode->i_mapping->a_ops = &btrfs_symlink_aops;
280 init_special_inode(inode, inode->i_mode, rdev);
286 btrfs_release_path(root, path);
287 btrfs_free_path(path);
288 mutex_unlock(&root->fs_info->fs_mutex);
289 make_bad_inode(inode);
292 static void fill_inode_item(struct extent_buffer *leaf,
293 struct btrfs_inode_item *item,
296 btrfs_set_inode_uid(leaf, item, inode->i_uid);
297 btrfs_set_inode_gid(leaf, item, inode->i_gid);
298 btrfs_set_inode_size(leaf, item, inode->i_size);
299 btrfs_set_inode_mode(leaf, item, inode->i_mode);
300 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
302 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
303 inode->i_atime.tv_sec);
304 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
305 inode->i_atime.tv_nsec);
307 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
308 inode->i_mtime.tv_sec);
309 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
310 inode->i_mtime.tv_nsec);
312 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
313 inode->i_ctime.tv_sec);
314 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
315 inode->i_ctime.tv_nsec);
317 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
318 btrfs_set_inode_generation(leaf, item, inode->i_generation);
319 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
320 btrfs_set_inode_block_group(leaf, item,
321 BTRFS_I(inode)->block_group->key.objectid);
324 int btrfs_update_inode(struct btrfs_trans_handle *trans,
325 struct btrfs_root *root,
328 struct btrfs_inode_item *inode_item;
329 struct btrfs_path *path;
330 struct extent_buffer *leaf;
333 path = btrfs_alloc_path();
335 ret = btrfs_lookup_inode(trans, root, path,
336 &BTRFS_I(inode)->location, 1);
343 leaf = path->nodes[0];
344 inode_item = btrfs_item_ptr(leaf, path->slots[0],
345 struct btrfs_inode_item);
347 fill_inode_item(leaf, inode_item, inode);
348 btrfs_mark_buffer_dirty(leaf);
349 btrfs_set_inode_last_trans(trans, inode);
352 btrfs_release_path(root, path);
353 btrfs_free_path(path);
358 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
359 struct btrfs_root *root,
361 struct dentry *dentry)
363 struct btrfs_path *path;
364 const char *name = dentry->d_name.name;
365 int name_len = dentry->d_name.len;
367 struct extent_buffer *leaf;
368 struct btrfs_dir_item *di;
369 struct btrfs_key key;
371 path = btrfs_alloc_path();
377 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
387 leaf = path->nodes[0];
388 btrfs_dir_item_key_to_cpu(leaf, di, &key);
389 ret = btrfs_delete_one_dir_name(trans, root, path, di);
392 btrfs_release_path(root, path);
394 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
395 key.objectid, name, name_len, -1);
404 ret = btrfs_delete_one_dir_name(trans, root, path, di);
406 dentry->d_inode->i_ctime = dir->i_ctime;
408 btrfs_free_path(path);
410 dir->i_size -= name_len * 2;
411 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
412 btrfs_update_inode(trans, root, dir);
413 drop_nlink(dentry->d_inode);
414 ret = btrfs_update_inode(trans, root, dentry->d_inode);
415 dir->i_sb->s_dirt = 1;
420 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
422 struct btrfs_root *root;
423 struct btrfs_trans_handle *trans;
427 root = BTRFS_I(dir)->root;
428 mutex_lock(&root->fs_info->fs_mutex);
429 trans = btrfs_start_transaction(root, 1);
431 btrfs_set_trans_block_group(trans, dir);
432 ret = btrfs_unlink_trans(trans, root, dir, dentry);
433 nr = trans->blocks_used;
435 btrfs_end_transaction(trans, root);
436 mutex_unlock(&root->fs_info->fs_mutex);
437 btrfs_btree_balance_dirty(root, nr);
442 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
444 struct inode *inode = dentry->d_inode;
447 struct btrfs_root *root = BTRFS_I(dir)->root;
448 struct btrfs_path *path;
449 struct btrfs_key key;
450 struct btrfs_trans_handle *trans;
451 struct btrfs_key found_key;
453 struct extent_buffer *leaf;
454 char *goodnames = "..";
457 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
460 path = btrfs_alloc_path();
462 mutex_lock(&root->fs_info->fs_mutex);
463 trans = btrfs_start_transaction(root, 1);
465 btrfs_set_trans_block_group(trans, dir);
466 key.objectid = inode->i_ino;
467 key.offset = (u64)-1;
470 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
476 if (path->slots[0] == 0) {
481 leaf = path->nodes[0];
482 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
483 found_type = btrfs_key_type(&found_key);
484 if (found_key.objectid != inode->i_ino) {
488 if ((found_type != BTRFS_DIR_ITEM_KEY &&
489 found_type != BTRFS_DIR_INDEX_KEY) ||
490 (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
491 !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
495 ret = btrfs_del_item(trans, root, path);
498 if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
500 btrfs_release_path(root, path);
503 btrfs_release_path(root, path);
505 /* now the directory is empty */
506 err = btrfs_unlink_trans(trans, root, dir, dentry);
511 btrfs_release_path(root, path);
512 btrfs_free_path(path);
513 nr = trans->blocks_used;
514 ret = btrfs_end_transaction(trans, root);
515 mutex_unlock(&root->fs_info->fs_mutex);
516 btrfs_btree_balance_dirty(root, nr);
522 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
523 struct btrfs_root *root,
526 struct btrfs_path *path;
531 path = btrfs_alloc_path();
533 ret = btrfs_lookup_inode(trans, root, path,
534 &BTRFS_I(inode)->location, -1);
538 ret = btrfs_del_item(trans, root, path);
539 btrfs_free_path(path);
544 * this can truncate away extent items, csum items and directory items.
545 * It starts at a high offset and removes keys until it can't find
546 * any higher than i_size.
548 * csum items that cross the new i_size are truncated to the new size
551 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
552 struct btrfs_root *root,
556 struct btrfs_path *path;
557 struct btrfs_key key;
558 struct btrfs_key found_key;
560 struct extent_buffer *leaf;
561 struct btrfs_file_extent_item *fi;
562 u64 extent_start = 0;
563 u64 extent_num_bytes = 0;
568 int extent_type = -1;
570 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
571 path = btrfs_alloc_path();
575 /* FIXME, add redo link to tree so we don't leak on crash */
576 key.objectid = inode->i_ino;
577 key.offset = (u64)-1;
581 btrfs_init_path(path);
583 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
588 BUG_ON(path->slots[0] == 0);
591 leaf = path->nodes[0];
592 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
593 found_type = btrfs_key_type(&found_key);
595 if (found_key.objectid != inode->i_ino)
598 if (found_type != BTRFS_CSUM_ITEM_KEY &&
599 found_type != BTRFS_DIR_ITEM_KEY &&
600 found_type != BTRFS_DIR_INDEX_KEY &&
601 found_type != BTRFS_EXTENT_DATA_KEY)
604 item_end = found_key.offset;
605 if (found_type == BTRFS_EXTENT_DATA_KEY) {
606 fi = btrfs_item_ptr(leaf, path->slots[0],
607 struct btrfs_file_extent_item);
608 extent_type = btrfs_file_extent_type(leaf, fi);
609 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
611 btrfs_file_extent_num_bytes(leaf, fi);
612 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
613 struct btrfs_item *item = btrfs_item_nr(leaf,
615 item_end += btrfs_file_extent_inline_len(leaf,
620 if (found_type == BTRFS_CSUM_ITEM_KEY) {
621 ret = btrfs_csum_truncate(trans, root, path,
625 if (item_end < inode->i_size) {
626 if (found_type == BTRFS_DIR_ITEM_KEY) {
627 found_type = BTRFS_INODE_ITEM_KEY;
628 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
629 found_type = BTRFS_CSUM_ITEM_KEY;
630 } else if (found_type) {
635 btrfs_set_key_type(&key, found_type);
636 btrfs_release_path(root, path);
639 if (found_key.offset >= inode->i_size)
645 /* FIXME, shrink the extent if the ref count is only 1 */
646 if (found_type != BTRFS_EXTENT_DATA_KEY)
649 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
651 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
654 btrfs_file_extent_num_bytes(leaf, fi);
655 extent_num_bytes = inode->i_size -
656 found_key.offset + root->sectorsize - 1;
657 btrfs_set_file_extent_num_bytes(leaf, fi,
659 num_dec = (orig_num_bytes -
660 extent_num_bytes) >> 9;
661 if (extent_start != 0) {
662 inode->i_blocks -= num_dec;
664 btrfs_mark_buffer_dirty(leaf);
667 btrfs_file_extent_disk_num_bytes(leaf,
669 /* FIXME blocksize != 4096 */
670 num_dec = btrfs_file_extent_num_bytes(leaf,
672 if (extent_start != 0) {
674 inode->i_blocks -= num_dec;
676 if (leaf == root->node) {
678 btrfs_header_generation(leaf);
680 struct extent_buffer *parent;
681 parent = path->nodes[1];
683 btrfs_header_generation(parent);
686 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
688 u32 newsize = inode->i_size - found_key.offset;
689 newsize = btrfs_file_extent_calc_inline_size(newsize);
690 ret = btrfs_truncate_item(trans, root, path,
696 ret = btrfs_del_item(trans, root, path);
702 btrfs_release_path(root, path);
704 ret = btrfs_free_extent(trans, root, extent_start,
706 root->root_key.objectid,
707 root_gen, inode->i_ino,
708 found_key.offset, 0);
714 btrfs_release_path(root, path);
715 btrfs_free_path(path);
716 inode->i_sb->s_dirt = 1;
720 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
725 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
726 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
727 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
729 set_page_extent_mapped(page);
731 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
732 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
734 if (zero_start != PAGE_CACHE_SIZE) {
736 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
737 flush_dcache_page(page);
740 set_page_dirty(page);
741 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
747 * taken from block_truncate_page, but does cow as it zeros out
748 * any bytes left in the last page in the file.
750 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
752 struct inode *inode = mapping->host;
753 struct btrfs_root *root = BTRFS_I(inode)->root;
754 u32 blocksize = root->sectorsize;
755 pgoff_t index = from >> PAGE_CACHE_SHIFT;
756 unsigned offset = from & (PAGE_CACHE_SIZE-1);
761 if ((offset & (blocksize - 1)) == 0)
764 down_read(&root->snap_sem);
766 page = grab_cache_page(mapping, index);
769 if (!PageUptodate(page)) {
770 ret = btrfs_readpage(NULL, page);
772 if (!PageUptodate(page)) {
777 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
779 ret = btrfs_cow_one_page(inode, page, offset);
782 page_cache_release(page);
783 up_read(&BTRFS_I(inode)->root->snap_sem);
788 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
790 struct inode *inode = dentry->d_inode;
793 err = inode_change_ok(inode, attr);
797 if (S_ISREG(inode->i_mode) &&
798 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
799 struct btrfs_trans_handle *trans;
800 struct btrfs_root *root = BTRFS_I(inode)->root;
801 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
803 u64 mask = root->sectorsize - 1;
804 u64 pos = (inode->i_size + mask) & ~mask;
805 u64 block_end = attr->ia_size | mask;
809 if (attr->ia_size <= pos)
812 btrfs_truncate_page(inode->i_mapping, inode->i_size);
814 lock_extent(em_tree, pos, block_end, GFP_NOFS);
815 hole_size = (attr->ia_size - pos + mask) & ~mask;
817 mutex_lock(&root->fs_info->fs_mutex);
818 trans = btrfs_start_transaction(root, 1);
819 btrfs_set_trans_block_group(trans, inode);
820 err = btrfs_drop_extents(trans, root, inode,
821 pos, pos + hole_size, pos,
824 if (alloc_hint != EXTENT_MAP_INLINE) {
825 err = btrfs_insert_file_extent(trans, root,
827 pos, 0, 0, hole_size);
829 btrfs_end_transaction(trans, root);
830 mutex_unlock(&root->fs_info->fs_mutex);
831 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
836 err = inode_setattr(inode, attr);
840 void btrfs_delete_inode(struct inode *inode)
842 struct btrfs_trans_handle *trans;
843 struct btrfs_root *root = BTRFS_I(inode)->root;
847 truncate_inode_pages(&inode->i_data, 0);
848 if (is_bad_inode(inode)) {
853 mutex_lock(&root->fs_info->fs_mutex);
854 trans = btrfs_start_transaction(root, 1);
856 btrfs_set_trans_block_group(trans, inode);
857 ret = btrfs_truncate_in_trans(trans, root, inode);
860 ret = btrfs_delete_xattrs(trans, root, inode);
863 ret = btrfs_free_inode(trans, root, inode);
866 nr = trans->blocks_used;
868 btrfs_end_transaction(trans, root);
869 mutex_unlock(&root->fs_info->fs_mutex);
870 btrfs_btree_balance_dirty(root, nr);
874 nr = trans->blocks_used;
875 btrfs_end_transaction(trans, root);
876 mutex_unlock(&root->fs_info->fs_mutex);
877 btrfs_btree_balance_dirty(root, nr);
883 * this returns the key found in the dir entry in the location pointer.
884 * If no dir entries were found, location->objectid is 0.
886 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
887 struct btrfs_key *location)
889 const char *name = dentry->d_name.name;
890 int namelen = dentry->d_name.len;
891 struct btrfs_dir_item *di;
892 struct btrfs_path *path;
893 struct btrfs_root *root = BTRFS_I(dir)->root;
896 path = btrfs_alloc_path();
898 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
902 if (!di || IS_ERR(di)) {
903 location->objectid = 0;
906 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
908 btrfs_release_path(root, path);
909 btrfs_free_path(path);
914 * when we hit a tree root in a directory, the btrfs part of the inode
915 * needs to be changed to reflect the root directory of the tree root. This
916 * is kind of like crossing a mount point.
918 static int fixup_tree_root_location(struct btrfs_root *root,
919 struct btrfs_key *location,
920 struct btrfs_root **sub_root,
921 struct dentry *dentry)
923 struct btrfs_path *path;
924 struct btrfs_root_item *ri;
926 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
928 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
931 path = btrfs_alloc_path();
933 mutex_lock(&root->fs_info->fs_mutex);
935 *sub_root = btrfs_read_fs_root(root->fs_info, location,
938 if (IS_ERR(*sub_root))
939 return PTR_ERR(*sub_root);
941 ri = &(*sub_root)->root_item;
942 location->objectid = btrfs_root_dirid(ri);
943 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
944 location->offset = 0;
946 btrfs_free_path(path);
947 mutex_unlock(&root->fs_info->fs_mutex);
951 static int btrfs_init_locked_inode(struct inode *inode, void *p)
953 struct btrfs_iget_args *args = p;
954 inode->i_ino = args->ino;
955 BTRFS_I(inode)->root = args->root;
956 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
957 inode->i_mapping, GFP_NOFS);
961 static int btrfs_find_actor(struct inode *inode, void *opaque)
963 struct btrfs_iget_args *args = opaque;
964 return (args->ino == inode->i_ino &&
965 args->root == BTRFS_I(inode)->root);
968 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
969 struct btrfs_root *root)
972 struct btrfs_iget_args args;
976 inode = iget5_locked(s, objectid, btrfs_find_actor,
977 btrfs_init_locked_inode,
982 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
983 struct nameidata *nd)
985 struct inode * inode;
986 struct btrfs_inode *bi = BTRFS_I(dir);
987 struct btrfs_root *root = bi->root;
988 struct btrfs_root *sub_root = root;
989 struct btrfs_key location;
992 if (dentry->d_name.len > BTRFS_NAME_LEN)
993 return ERR_PTR(-ENAMETOOLONG);
995 mutex_lock(&root->fs_info->fs_mutex);
996 ret = btrfs_inode_by_name(dir, dentry, &location);
997 mutex_unlock(&root->fs_info->fs_mutex);
1000 return ERR_PTR(ret);
1003 if (location.objectid) {
1004 ret = fixup_tree_root_location(root, &location, &sub_root,
1007 return ERR_PTR(ret);
1009 return ERR_PTR(-ENOENT);
1010 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1013 return ERR_PTR(-EACCES);
1014 if (inode->i_state & I_NEW) {
1015 /* the inode and parent dir are two different roots */
1016 if (sub_root != root) {
1018 sub_root->inode = inode;
1020 BTRFS_I(inode)->root = sub_root;
1021 memcpy(&BTRFS_I(inode)->location, &location,
1023 btrfs_read_locked_inode(inode);
1024 unlock_new_inode(inode);
1027 return d_splice_alias(inode, dentry);
1030 static unsigned char btrfs_filetype_table[] = {
1031 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1034 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1036 struct inode *inode = filp->f_path.dentry->d_inode;
1037 struct btrfs_root *root = BTRFS_I(inode)->root;
1038 struct btrfs_item *item;
1039 struct btrfs_dir_item *di;
1040 struct btrfs_key key;
1041 struct btrfs_key found_key;
1042 struct btrfs_path *path;
1045 struct extent_buffer *leaf;
1048 unsigned char d_type;
1053 int key_type = BTRFS_DIR_INDEX_KEY;
1058 /* FIXME, use a real flag for deciding about the key type */
1059 if (root->fs_info->tree_root == root)
1060 key_type = BTRFS_DIR_ITEM_KEY;
1062 mutex_lock(&root->fs_info->fs_mutex);
1063 key.objectid = inode->i_ino;
1064 btrfs_set_key_type(&key, key_type);
1065 key.offset = filp->f_pos;
1067 path = btrfs_alloc_path();
1069 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1074 leaf = path->nodes[0];
1075 nritems = btrfs_header_nritems(leaf);
1076 slot = path->slots[0];
1077 if (advance || slot >= nritems) {
1078 if (slot >= nritems -1) {
1079 ret = btrfs_next_leaf(root, path);
1082 leaf = path->nodes[0];
1083 nritems = btrfs_header_nritems(leaf);
1084 slot = path->slots[0];
1091 item = btrfs_item_nr(leaf, slot);
1092 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1094 if (found_key.objectid != key.objectid)
1096 if (btrfs_key_type(&found_key) != key_type)
1098 if (found_key.offset < filp->f_pos)
1101 filp->f_pos = found_key.offset;
1103 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1105 di_total = btrfs_item_size(leaf, item);
1106 while(di_cur < di_total) {
1107 struct btrfs_key location;
1109 name_len = btrfs_dir_name_len(leaf, di);
1110 if (name_len < 32) {
1111 name_ptr = tmp_name;
1113 name_ptr = kmalloc(name_len, GFP_NOFS);
1116 read_extent_buffer(leaf, name_ptr,
1117 (unsigned long)(di + 1), name_len);
1119 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1120 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1122 over = filldir(dirent, name_ptr, name_len,
1127 if (name_ptr != tmp_name)
1132 di_len = btrfs_dir_name_len(leaf, di) +
1133 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1135 di = (struct btrfs_dir_item *)((char *)di + di_len);
1142 btrfs_release_path(root, path);
1143 btrfs_free_path(path);
1144 mutex_unlock(&root->fs_info->fs_mutex);
1148 int btrfs_write_inode(struct inode *inode, int wait)
1150 struct btrfs_root *root = BTRFS_I(inode)->root;
1151 struct btrfs_trans_handle *trans;
1155 mutex_lock(&root->fs_info->fs_mutex);
1156 trans = btrfs_start_transaction(root, 1);
1157 btrfs_set_trans_block_group(trans, inode);
1158 ret = btrfs_commit_transaction(trans, root);
1159 mutex_unlock(&root->fs_info->fs_mutex);
1165 * This is somewhat expensive, updating the tree every time the
1166 * inode changes. But, it is most likely to find the inode in cache.
1167 * FIXME, needs more benchmarking...there are no reasons other than performance
1168 * to keep or drop this code.
1170 void btrfs_dirty_inode(struct inode *inode)
1172 struct btrfs_root *root = BTRFS_I(inode)->root;
1173 struct btrfs_trans_handle *trans;
1175 mutex_lock(&root->fs_info->fs_mutex);
1176 trans = btrfs_start_transaction(root, 1);
1177 btrfs_set_trans_block_group(trans, inode);
1178 btrfs_update_inode(trans, root, inode);
1179 btrfs_end_transaction(trans, root);
1180 mutex_unlock(&root->fs_info->fs_mutex);
1183 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1184 struct btrfs_root *root,
1186 struct btrfs_block_group_cache *group,
1189 struct inode *inode;
1190 struct btrfs_inode_item *inode_item;
1191 struct btrfs_key *location;
1192 struct btrfs_path *path;
1196 path = btrfs_alloc_path();
1199 inode = new_inode(root->fs_info->sb);
1201 return ERR_PTR(-ENOMEM);
1203 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1204 inode->i_mapping, GFP_NOFS);
1205 BTRFS_I(inode)->root = root;
1211 group = btrfs_find_block_group(root, group, 0, 0, owner);
1212 BTRFS_I(inode)->block_group = group;
1214 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
1218 inode->i_uid = current->fsuid;
1219 inode->i_gid = current->fsgid;
1220 inode->i_mode = mode;
1221 inode->i_ino = objectid;
1222 inode->i_blocks = 0;
1223 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1224 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1225 struct btrfs_inode_item);
1226 fill_inode_item(path->nodes[0], inode_item, inode);
1227 btrfs_mark_buffer_dirty(path->nodes[0]);
1228 btrfs_free_path(path);
1230 location = &BTRFS_I(inode)->location;
1231 location->objectid = objectid;
1232 location->offset = 0;
1233 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1235 insert_inode_hash(inode);
1238 btrfs_free_path(path);
1239 return ERR_PTR(ret);
1242 static inline u8 btrfs_inode_type(struct inode *inode)
1244 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1247 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1248 struct dentry *dentry, struct inode *inode)
1251 struct btrfs_key key;
1252 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1253 struct inode *parent_inode;
1255 key.objectid = inode->i_ino;
1256 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1259 ret = btrfs_insert_dir_item(trans, root,
1260 dentry->d_name.name, dentry->d_name.len,
1261 dentry->d_parent->d_inode->i_ino,
1262 &key, btrfs_inode_type(inode));
1264 parent_inode = dentry->d_parent->d_inode;
1265 parent_inode->i_size += dentry->d_name.len * 2;
1266 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1267 ret = btrfs_update_inode(trans, root,
1268 dentry->d_parent->d_inode);
1273 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1274 struct dentry *dentry, struct inode *inode)
1276 int err = btrfs_add_link(trans, dentry, inode);
1278 d_instantiate(dentry, inode);
1286 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1287 int mode, dev_t rdev)
1289 struct btrfs_trans_handle *trans;
1290 struct btrfs_root *root = BTRFS_I(dir)->root;
1291 struct inode *inode;
1297 if (!new_valid_dev(rdev))
1300 mutex_lock(&root->fs_info->fs_mutex);
1301 trans = btrfs_start_transaction(root, 1);
1302 btrfs_set_trans_block_group(trans, dir);
1304 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1310 inode = btrfs_new_inode(trans, root, objectid,
1311 BTRFS_I(dir)->block_group, mode);
1312 err = PTR_ERR(inode);
1316 btrfs_set_trans_block_group(trans, inode);
1317 err = btrfs_add_nondir(trans, dentry, inode);
1321 inode->i_op = &btrfs_special_inode_operations;
1322 init_special_inode(inode, inode->i_mode, rdev);
1323 btrfs_update_inode(trans, root, inode);
1325 dir->i_sb->s_dirt = 1;
1326 btrfs_update_inode_block_group(trans, inode);
1327 btrfs_update_inode_block_group(trans, dir);
1329 nr = trans->blocks_used;
1330 btrfs_end_transaction(trans, root);
1331 mutex_unlock(&root->fs_info->fs_mutex);
1334 inode_dec_link_count(inode);
1337 btrfs_btree_balance_dirty(root, nr);
1341 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1342 int mode, struct nameidata *nd)
1344 struct btrfs_trans_handle *trans;
1345 struct btrfs_root *root = BTRFS_I(dir)->root;
1346 struct inode *inode;
1352 mutex_lock(&root->fs_info->fs_mutex);
1353 trans = btrfs_start_transaction(root, 1);
1354 btrfs_set_trans_block_group(trans, dir);
1356 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1362 inode = btrfs_new_inode(trans, root, objectid,
1363 BTRFS_I(dir)->block_group, mode);
1364 err = PTR_ERR(inode);
1368 btrfs_set_trans_block_group(trans, inode);
1369 err = btrfs_add_nondir(trans, dentry, inode);
1373 inode->i_mapping->a_ops = &btrfs_aops;
1374 inode->i_fop = &btrfs_file_operations;
1375 inode->i_op = &btrfs_file_inode_operations;
1376 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1377 inode->i_mapping, GFP_NOFS);
1378 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
1380 dir->i_sb->s_dirt = 1;
1381 btrfs_update_inode_block_group(trans, inode);
1382 btrfs_update_inode_block_group(trans, dir);
1384 nr = trans->blocks_used;
1385 btrfs_end_transaction(trans, root);
1386 mutex_unlock(&root->fs_info->fs_mutex);
1389 inode_dec_link_count(inode);
1392 btrfs_btree_balance_dirty(root, nr);
1396 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1397 struct dentry *dentry)
1399 struct btrfs_trans_handle *trans;
1400 struct btrfs_root *root = BTRFS_I(dir)->root;
1401 struct inode *inode = old_dentry->d_inode;
1406 if (inode->i_nlink == 0)
1410 mutex_lock(&root->fs_info->fs_mutex);
1411 trans = btrfs_start_transaction(root, 1);
1413 btrfs_set_trans_block_group(trans, dir);
1414 atomic_inc(&inode->i_count);
1415 err = btrfs_add_nondir(trans, dentry, inode);
1420 dir->i_sb->s_dirt = 1;
1421 btrfs_update_inode_block_group(trans, dir);
1422 err = btrfs_update_inode(trans, root, inode);
1427 nr = trans->blocks_used;
1428 btrfs_end_transaction(trans, root);
1429 mutex_unlock(&root->fs_info->fs_mutex);
1432 inode_dec_link_count(inode);
1435 btrfs_btree_balance_dirty(root, nr);
1439 static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
1440 struct btrfs_root *root,
1441 u64 objectid, u64 dirid)
1445 struct btrfs_key key;
1450 key.objectid = objectid;
1452 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1454 ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
1455 &key, BTRFS_FT_DIR);
1459 key.objectid = dirid;
1460 ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
1461 &key, BTRFS_FT_DIR);
1468 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1470 struct inode *inode;
1471 struct btrfs_trans_handle *trans;
1472 struct btrfs_root *root = BTRFS_I(dir)->root;
1474 int drop_on_err = 0;
1476 unsigned long nr = 1;
1478 mutex_lock(&root->fs_info->fs_mutex);
1479 trans = btrfs_start_transaction(root, 1);
1480 btrfs_set_trans_block_group(trans, dir);
1482 if (IS_ERR(trans)) {
1483 err = PTR_ERR(trans);
1487 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1493 inode = btrfs_new_inode(trans, root, objectid,
1494 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1495 if (IS_ERR(inode)) {
1496 err = PTR_ERR(inode);
1501 inode->i_op = &btrfs_dir_inode_operations;
1502 inode->i_fop = &btrfs_dir_file_operations;
1503 btrfs_set_trans_block_group(trans, inode);
1505 err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
1510 err = btrfs_update_inode(trans, root, inode);
1514 err = btrfs_add_link(trans, dentry, inode);
1518 d_instantiate(dentry, inode);
1520 dir->i_sb->s_dirt = 1;
1521 btrfs_update_inode_block_group(trans, inode);
1522 btrfs_update_inode_block_group(trans, dir);
1525 nr = trans->blocks_used;
1526 btrfs_end_transaction(trans, root);
1529 mutex_unlock(&root->fs_info->fs_mutex);
1532 btrfs_btree_balance_dirty(root, nr);
1536 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1537 size_t page_offset, u64 start, u64 end,
1543 u64 extent_start = 0;
1545 u64 objectid = inode->i_ino;
1547 int failed_insert = 0;
1548 struct btrfs_path *path;
1549 struct btrfs_root *root = BTRFS_I(inode)->root;
1550 struct btrfs_file_extent_item *item;
1551 struct extent_buffer *leaf;
1552 struct btrfs_key found_key;
1553 struct extent_map *em = NULL;
1554 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1555 struct btrfs_trans_handle *trans = NULL;
1557 path = btrfs_alloc_path();
1559 mutex_lock(&root->fs_info->fs_mutex);
1562 em = lookup_extent_mapping(em_tree, start, end);
1567 em = alloc_extent_map(GFP_NOFS);
1572 em->start = EXTENT_MAP_HOLE;
1573 em->end = EXTENT_MAP_HOLE;
1575 em->bdev = inode->i_sb->s_bdev;
1576 ret = btrfs_lookup_file_extent(trans, root, path,
1577 objectid, start, trans != NULL);
1584 if (path->slots[0] == 0)
1589 leaf = path->nodes[0];
1590 item = btrfs_item_ptr(leaf, path->slots[0],
1591 struct btrfs_file_extent_item);
1592 /* are we inside the extent that was found? */
1593 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1594 found_type = btrfs_key_type(&found_key);
1595 if (found_key.objectid != objectid ||
1596 found_type != BTRFS_EXTENT_DATA_KEY) {
1600 found_type = btrfs_file_extent_type(leaf, item);
1601 extent_start = found_key.offset;
1602 if (found_type == BTRFS_FILE_EXTENT_REG) {
1603 extent_end = extent_start +
1604 btrfs_file_extent_num_bytes(leaf, item);
1606 if (start < extent_start || start >= extent_end) {
1608 if (start < extent_start) {
1609 if (end < extent_start)
1611 em->end = extent_end - 1;
1617 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1619 em->start = extent_start;
1620 em->end = extent_end - 1;
1621 em->block_start = EXTENT_MAP_HOLE;
1622 em->block_end = EXTENT_MAP_HOLE;
1625 bytenr += btrfs_file_extent_offset(leaf, item);
1626 em->block_start = bytenr;
1627 em->block_end = em->block_start +
1628 btrfs_file_extent_num_bytes(leaf, item) - 1;
1629 em->start = extent_start;
1630 em->end = extent_end - 1;
1632 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1636 size_t extent_offset;
1639 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
1641 extent_end = (extent_start + size - 1) |
1642 ((u64)root->sectorsize - 1);
1643 if (start < extent_start || start >= extent_end) {
1645 if (start < extent_start) {
1646 if (end < extent_start)
1648 em->end = extent_end;
1654 em->block_start = EXTENT_MAP_INLINE;
1655 em->block_end = EXTENT_MAP_INLINE;
1658 em->start = extent_start;
1659 em->end = extent_start + size - 1;
1663 extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
1664 extent_start + page_offset;
1665 copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
1666 size - extent_offset);
1667 em->start = extent_start + extent_offset;
1668 em->end = (em->start + copy_size -1) |
1669 ((u64)root->sectorsize -1);
1671 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
1672 if (create == 0 && !PageUptodate(page)) {
1673 read_extent_buffer(leaf, map + page_offset, ptr,
1675 flush_dcache_page(page);
1676 } else if (create && PageUptodate(page)) {
1679 free_extent_map(em);
1681 btrfs_release_path(root, path);
1682 trans = btrfs_start_transaction(root, 1);
1685 write_extent_buffer(leaf, map + page_offset, ptr,
1687 btrfs_mark_buffer_dirty(leaf);
1690 set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
1693 printk("unkknown found_type %d\n", found_type);
1700 em->block_start = EXTENT_MAP_HOLE;
1701 em->block_end = EXTENT_MAP_HOLE;
1703 btrfs_release_path(root, path);
1704 if (em->start > start || em->end < start) {
1705 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
1709 ret = add_extent_mapping(em_tree, em);
1710 if (ret == -EEXIST) {
1711 free_extent_map(em);
1714 if (failed_insert > 5) {
1715 printk("failing to insert %Lu %Lu\n", start, end);
1723 btrfs_free_path(path);
1725 ret = btrfs_end_transaction(trans, root);
1729 mutex_unlock(&root->fs_info->fs_mutex);
1731 free_extent_map(em);
1733 return ERR_PTR(err);
1738 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
1740 return extent_bmap(mapping, iblock, btrfs_get_extent);
1743 static int btrfs_prepare_write(struct file *file, struct page *page,
1744 unsigned from, unsigned to)
1746 return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree,
1747 page->mapping->host, page, from, to,
1751 int btrfs_readpage(struct file *file, struct page *page)
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);
1757 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1759 struct extent_map_tree *tree;
1762 if (current->flags & PF_MEMALLOC) {
1763 redirty_page_for_writepage(wbc, page);
1767 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1768 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
1771 static int btrfs_writepages(struct address_space *mapping,
1772 struct writeback_control *wbc)
1774 struct extent_map_tree *tree;
1775 tree = &BTRFS_I(mapping->host)->extent_tree;
1776 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
1780 btrfs_readpages(struct file *file, struct address_space *mapping,
1781 struct list_head *pages, unsigned nr_pages)
1783 struct extent_map_tree *tree;
1784 tree = &BTRFS_I(mapping->host)->extent_tree;
1785 return extent_readpages(tree, mapping, pages, nr_pages,
1789 static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
1791 struct extent_map_tree *tree;
1794 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1795 ret = try_release_extent_mapping(tree, page);
1797 ClearPagePrivate(page);
1798 set_page_private(page, 0);
1799 page_cache_release(page);
1804 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
1806 struct extent_map_tree *tree;
1808 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1809 extent_invalidatepage(tree, page, offset);
1810 btrfs_releasepage(page, GFP_NOFS);
1814 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1815 * called from a page fault handler when a page is first dirtied. Hence we must
1816 * be careful to check for EOF conditions here. We set the page up correctly
1817 * for a written page which means we get ENOSPC checking when writing into
1818 * holes and correct delalloc and unwritten extent mapping on filesystems that
1819 * support these features.
1821 * We are not allowed to take the i_mutex here so we have to play games to
1822 * protect against truncate races as the page could now be beyond EOF. Because
1823 * vmtruncate() writes the inode size before removing pages, once we have the
1824 * page lock we can determine safely if the page is beyond EOF. If it is not
1825 * beyond EOF, then the page is guaranteed safe against truncation until we
1828 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
1830 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
1836 down_read(&BTRFS_I(inode)->root->snap_sem);
1838 wait_on_page_writeback(page);
1839 size = i_size_read(inode);
1840 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1842 if ((page->mapping != inode->i_mapping) ||
1843 (page_start > size)) {
1844 /* page got truncated out from underneath us */
1848 /* page is wholly or partially inside EOF */
1849 if (page_start + PAGE_CACHE_SIZE > size)
1850 end = size & ~PAGE_CACHE_MASK;
1852 end = PAGE_CACHE_SIZE;
1854 ret = btrfs_cow_one_page(inode, page, end);
1857 up_read(&BTRFS_I(inode)->root->snap_sem);
1862 static void btrfs_truncate(struct inode *inode)
1864 struct btrfs_root *root = BTRFS_I(inode)->root;
1866 struct btrfs_trans_handle *trans;
1869 if (!S_ISREG(inode->i_mode))
1871 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1874 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1876 mutex_lock(&root->fs_info->fs_mutex);
1877 trans = btrfs_start_transaction(root, 1);
1878 btrfs_set_trans_block_group(trans, inode);
1880 /* FIXME, add redo link to tree so we don't leak on crash */
1881 ret = btrfs_truncate_in_trans(trans, root, inode);
1882 btrfs_update_inode(trans, root, inode);
1883 nr = trans->blocks_used;
1885 ret = btrfs_end_transaction(trans, root);
1887 mutex_unlock(&root->fs_info->fs_mutex);
1888 btrfs_btree_balance_dirty(root, nr);
1891 int btrfs_commit_write(struct file *file, struct page *page,
1892 unsigned from, unsigned to)
1894 return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree,
1895 page->mapping->host, page, from, to);
1898 static int create_subvol(struct btrfs_root *root, char *name, int namelen)
1900 struct btrfs_trans_handle *trans;
1901 struct btrfs_key key;
1902 struct btrfs_root_item root_item;
1903 struct btrfs_inode_item *inode_item;
1904 struct extent_buffer *leaf;
1905 struct btrfs_root *new_root;
1906 struct inode *inode;
1911 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
1912 unsigned long nr = 1;
1914 mutex_lock(&root->fs_info->fs_mutex);
1915 trans = btrfs_start_transaction(root, 1);
1918 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
1923 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
1924 objectid, trans->transid, 0, 0,
1927 return PTR_ERR(leaf);
1929 btrfs_set_header_nritems(leaf, 0);
1930 btrfs_set_header_level(leaf, 0);
1931 btrfs_set_header_bytenr(leaf, leaf->start);
1932 btrfs_set_header_generation(leaf, trans->transid);
1933 btrfs_set_header_owner(leaf, objectid);
1935 write_extent_buffer(leaf, root->fs_info->fsid,
1936 (unsigned long)btrfs_header_fsid(leaf),
1938 btrfs_mark_buffer_dirty(leaf);
1940 inode_item = &root_item.inode;
1941 memset(inode_item, 0, sizeof(*inode_item));
1942 inode_item->generation = cpu_to_le64(1);
1943 inode_item->size = cpu_to_le64(3);
1944 inode_item->nlink = cpu_to_le32(1);
1945 inode_item->nblocks = cpu_to_le64(1);
1946 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
1948 btrfs_set_root_bytenr(&root_item, leaf->start);
1949 btrfs_set_root_level(&root_item, 0);
1950 btrfs_set_root_refs(&root_item, 1);
1951 btrfs_set_root_used(&root_item, 0);
1953 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
1954 root_item.drop_level = 0;
1956 free_extent_buffer(leaf);
1959 btrfs_set_root_dirid(&root_item, new_dirid);
1961 key.objectid = objectid;
1963 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
1964 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
1970 * insert the directory item
1972 key.offset = (u64)-1;
1973 dir = root->fs_info->sb->s_root->d_inode;
1974 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
1975 name, namelen, dir->i_ino, &key,
1980 ret = btrfs_commit_transaction(trans, root);
1984 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
1987 trans = btrfs_start_transaction(new_root, 1);
1990 inode = btrfs_new_inode(trans, new_root, new_dirid,
1991 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
1994 inode->i_op = &btrfs_dir_inode_operations;
1995 inode->i_fop = &btrfs_dir_file_operations;
1996 new_root->inode = inode;
1998 ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
2004 ret = btrfs_update_inode(trans, new_root, inode);
2008 nr = trans->blocks_used;
2009 err = btrfs_commit_transaction(trans, root);
2013 mutex_unlock(&root->fs_info->fs_mutex);
2014 btrfs_btree_balance_dirty(root, nr);
2018 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2020 struct btrfs_trans_handle *trans;
2021 struct btrfs_key key;
2022 struct btrfs_root_item new_root_item;
2023 struct extent_buffer *tmp;
2029 if (!root->ref_cows)
2032 down_write(&root->snap_sem);
2033 freeze_bdev(root->fs_info->sb->s_bdev);
2034 thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb);
2036 mutex_lock(&root->fs_info->fs_mutex);
2037 trans = btrfs_start_transaction(root, 1);
2040 ret = btrfs_update_inode(trans, root, root->inode);
2044 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2049 memcpy(&new_root_item, &root->root_item,
2050 sizeof(new_root_item));
2052 key.objectid = objectid;
2054 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2055 extent_buffer_get(root->node);
2056 btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
2057 free_extent_buffer(tmp);
2058 btrfs_set_root_bytenr(&new_root_item, root->node->start);
2059 btrfs_set_root_level(&new_root_item, btrfs_header_level(root->node));
2060 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2066 * insert the directory item
2068 key.offset = (u64)-1;
2069 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2071 root->fs_info->sb->s_root->d_inode->i_ino,
2072 &key, BTRFS_FT_DIR);
2077 ret = btrfs_inc_root_ref(trans, root, objectid);
2081 nr = trans->blocks_used;
2082 err = btrfs_commit_transaction(trans, root);
2087 mutex_unlock(&root->fs_info->fs_mutex);
2088 up_write(&root->snap_sem);
2089 btrfs_btree_balance_dirty(root, nr);
2093 static unsigned long force_ra(struct address_space *mapping,
2094 struct file_ra_state *ra, struct file *file,
2095 pgoff_t offset, pgoff_t last_index)
2099 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2100 req_size = last_index - offset + 1;
2101 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2104 req_size = min(last_index - offset + 1, (pgoff_t)128);
2105 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2106 return offset + req_size;
2110 int btrfs_defrag_file(struct file *file) {
2111 struct inode *inode = file->f_path.dentry->d_inode;
2112 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2114 unsigned long last_index;
2115 unsigned long ra_index = 0;
2120 mutex_lock(&inode->i_mutex);
2121 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2122 for (i = 0; i <= last_index; i++) {
2123 if (i == ra_index) {
2124 ra_index = force_ra(inode->i_mapping, &file->f_ra,
2125 file, ra_index, last_index);
2127 page = grab_cache_page(inode->i_mapping, i);
2130 if (!PageUptodate(page)) {
2131 btrfs_readpage(NULL, page);
2133 if (!PageUptodate(page)) {
2135 page_cache_release(page);
2139 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2140 page_end = page_start + PAGE_CACHE_SIZE - 1;
2142 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
2143 set_extent_delalloc(em_tree, page_start,
2144 page_end, GFP_NOFS);
2145 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
2146 set_page_dirty(page);
2148 page_cache_release(page);
2149 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2153 mutex_unlock(&inode->i_mutex);
2157 static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
2159 struct btrfs_ioctl_vol_args vol_args;
2160 struct btrfs_dir_item *di;
2161 struct btrfs_path *path;
2165 if (copy_from_user(&vol_args, arg, sizeof(vol_args)))
2168 namelen = strlen(vol_args.name);
2169 if (namelen > BTRFS_VOL_NAME_MAX)
2171 if (strchr(vol_args.name, '/'))
2174 path = btrfs_alloc_path();
2178 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2179 mutex_lock(&root->fs_info->fs_mutex);
2180 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2182 vol_args.name, namelen, 0);
2183 mutex_unlock(&root->fs_info->fs_mutex);
2184 btrfs_free_path(path);
2185 if (di && !IS_ERR(di))
2190 if (root == root->fs_info->tree_root)
2191 return create_subvol(root, vol_args.name, namelen);
2192 return create_snapshot(root, vol_args.name, namelen);
2195 static int btrfs_ioctl_defrag(struct file *file)
2197 struct inode *inode = file->f_path.dentry->d_inode;
2198 struct btrfs_root *root = BTRFS_I(inode)->root;
2200 switch (inode->i_mode & S_IFMT) {
2202 mutex_lock(&root->fs_info->fs_mutex);
2203 btrfs_defrag_root(root, 0);
2204 btrfs_defrag_root(root->fs_info->extent_root, 0);
2205 mutex_unlock(&root->fs_info->fs_mutex);
2208 btrfs_defrag_file(file);
2215 long btrfs_ioctl(struct file *file, unsigned int
2216 cmd, unsigned long arg)
2218 struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root;
2221 case BTRFS_IOC_SNAP_CREATE:
2222 return btrfs_ioctl_snap_create(root, (void __user *)arg);
2223 case BTRFS_IOC_DEFRAG:
2224 return btrfs_ioctl_defrag(file);
2231 * Called inside transaction, so use GFP_NOFS
2233 struct inode *btrfs_alloc_inode(struct super_block *sb)
2235 struct btrfs_inode *ei;
2237 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2241 return &ei->vfs_inode;
2244 void btrfs_destroy_inode(struct inode *inode)
2246 WARN_ON(!list_empty(&inode->i_dentry));
2247 WARN_ON(inode->i_data.nrpages);
2249 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2252 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2253 static void init_once(struct kmem_cache * cachep, void *foo)
2255 static void init_once(void * foo, struct kmem_cache * cachep,
2256 unsigned long flags)
2259 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2261 inode_init_once(&ei->vfs_inode);
2264 void btrfs_destroy_cachep(void)
2266 if (btrfs_inode_cachep)
2267 kmem_cache_destroy(btrfs_inode_cachep);
2268 if (btrfs_trans_handle_cachep)
2269 kmem_cache_destroy(btrfs_trans_handle_cachep);
2270 if (btrfs_transaction_cachep)
2271 kmem_cache_destroy(btrfs_transaction_cachep);
2272 if (btrfs_bit_radix_cachep)
2273 kmem_cache_destroy(btrfs_bit_radix_cachep);
2274 if (btrfs_path_cachep)
2275 kmem_cache_destroy(btrfs_path_cachep);
2278 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
2279 unsigned long extra_flags,
2280 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2281 void (*ctor)(struct kmem_cache *, void *)
2283 void (*ctor)(void *, struct kmem_cache *,
2288 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2289 SLAB_MEM_SPREAD | extra_flags), ctor
2290 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2296 int btrfs_init_cachep(void)
2298 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
2299 sizeof(struct btrfs_inode),
2301 if (!btrfs_inode_cachep)
2303 btrfs_trans_handle_cachep =
2304 btrfs_cache_create("btrfs_trans_handle_cache",
2305 sizeof(struct btrfs_trans_handle),
2307 if (!btrfs_trans_handle_cachep)
2309 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
2310 sizeof(struct btrfs_transaction),
2312 if (!btrfs_transaction_cachep)
2314 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
2315 sizeof(struct btrfs_path),
2317 if (!btrfs_path_cachep)
2319 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
2320 SLAB_DESTROY_BY_RCU, NULL);
2321 if (!btrfs_bit_radix_cachep)
2325 btrfs_destroy_cachep();
2329 static int btrfs_getattr(struct vfsmount *mnt,
2330 struct dentry *dentry, struct kstat *stat)
2332 struct inode *inode = dentry->d_inode;
2333 generic_fillattr(inode, stat);
2334 stat->blksize = 256 * 1024;
2338 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2339 struct inode * new_dir,struct dentry *new_dentry)
2341 struct btrfs_trans_handle *trans;
2342 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2343 struct inode *new_inode = new_dentry->d_inode;
2344 struct inode *old_inode = old_dentry->d_inode;
2345 struct timespec ctime = CURRENT_TIME;
2346 struct btrfs_path *path;
2347 struct btrfs_dir_item *di;
2350 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2351 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2355 mutex_lock(&root->fs_info->fs_mutex);
2356 trans = btrfs_start_transaction(root, 1);
2358 btrfs_set_trans_block_group(trans, new_dir);
2359 path = btrfs_alloc_path();
2365 old_dentry->d_inode->i_nlink++;
2366 old_dir->i_ctime = old_dir->i_mtime = ctime;
2367 new_dir->i_ctime = new_dir->i_mtime = ctime;
2368 old_inode->i_ctime = ctime;
2370 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
2371 struct btrfs_key *location = &BTRFS_I(new_dir)->location;
2372 struct btrfs_key old_parent_key;
2373 di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
2383 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &old_parent_key);
2384 ret = btrfs_del_item(trans, root, path);
2388 btrfs_release_path(root, path);
2390 di = btrfs_lookup_dir_index_item(trans, root, path,
2392 old_parent_key.objectid,
2402 ret = btrfs_del_item(trans, root, path);
2406 btrfs_release_path(root, path);
2408 ret = btrfs_insert_dir_item(trans, root, "..", 2,
2409 old_inode->i_ino, location,
2416 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2421 new_inode->i_ctime = CURRENT_TIME;
2422 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2426 ret = btrfs_add_link(trans, new_dentry, old_inode);
2431 btrfs_free_path(path);
2432 btrfs_end_transaction(trans, root);
2433 mutex_unlock(&root->fs_info->fs_mutex);
2437 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2438 const char *symname)
2440 struct btrfs_trans_handle *trans;
2441 struct btrfs_root *root = BTRFS_I(dir)->root;
2442 struct btrfs_path *path;
2443 struct btrfs_key key;
2444 struct inode *inode;
2451 struct btrfs_file_extent_item *ei;
2452 struct extent_buffer *leaf;
2455 name_len = strlen(symname) + 1;
2456 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2457 return -ENAMETOOLONG;
2458 mutex_lock(&root->fs_info->fs_mutex);
2459 trans = btrfs_start_transaction(root, 1);
2460 btrfs_set_trans_block_group(trans, dir);
2462 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2468 inode = btrfs_new_inode(trans, root, objectid,
2469 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2470 err = PTR_ERR(inode);
2474 btrfs_set_trans_block_group(trans, inode);
2475 err = btrfs_add_nondir(trans, dentry, inode);
2479 inode->i_mapping->a_ops = &btrfs_aops;
2480 inode->i_fop = &btrfs_file_operations;
2481 inode->i_op = &btrfs_file_inode_operations;
2482 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2483 inode->i_mapping, GFP_NOFS);
2484 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
2486 dir->i_sb->s_dirt = 1;
2487 btrfs_update_inode_block_group(trans, inode);
2488 btrfs_update_inode_block_group(trans, dir);
2492 path = btrfs_alloc_path();
2494 key.objectid = inode->i_ino;
2496 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2497 datasize = btrfs_file_extent_calc_inline_size(name_len);
2498 err = btrfs_insert_empty_item(trans, root, path, &key,
2504 leaf = path->nodes[0];
2505 ei = btrfs_item_ptr(leaf, path->slots[0],
2506 struct btrfs_file_extent_item);
2507 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2508 btrfs_set_file_extent_type(leaf, ei,
2509 BTRFS_FILE_EXTENT_INLINE);
2510 ptr = btrfs_file_extent_inline_start(ei);
2511 write_extent_buffer(leaf, symname, ptr, name_len);
2512 btrfs_mark_buffer_dirty(leaf);
2513 btrfs_free_path(path);
2515 inode->i_op = &btrfs_symlink_inode_operations;
2516 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2517 inode->i_size = name_len - 1;
2518 err = btrfs_update_inode(trans, root, inode);
2523 nr = trans->blocks_used;
2524 btrfs_end_transaction(trans, root);
2525 mutex_unlock(&root->fs_info->fs_mutex);
2527 inode_dec_link_count(inode);
2530 btrfs_btree_balance_dirty(root, nr);
2534 static struct inode_operations btrfs_dir_inode_operations = {
2535 .lookup = btrfs_lookup,
2536 .create = btrfs_create,
2537 .unlink = btrfs_unlink,
2539 .mkdir = btrfs_mkdir,
2540 .rmdir = btrfs_rmdir,
2541 .rename = btrfs_rename,
2542 .symlink = btrfs_symlink,
2543 .setattr = btrfs_setattr,
2544 .mknod = btrfs_mknod,
2545 .setxattr = generic_setxattr,
2546 .getxattr = generic_getxattr,
2547 .listxattr = btrfs_listxattr,
2548 .removexattr = generic_removexattr,
2551 static struct inode_operations btrfs_dir_ro_inode_operations = {
2552 .lookup = btrfs_lookup,
2555 static struct file_operations btrfs_dir_file_operations = {
2556 .llseek = generic_file_llseek,
2557 .read = generic_read_dir,
2558 .readdir = btrfs_readdir,
2559 .unlocked_ioctl = btrfs_ioctl,
2560 #ifdef CONFIG_COMPAT
2561 .compat_ioctl = btrfs_ioctl,
2565 static struct extent_map_ops btrfs_extent_map_ops = {
2566 .fill_delalloc = run_delalloc_range,
2567 .writepage_io_hook = btrfs_writepage_io_hook,
2568 .readpage_io_hook = btrfs_readpage_io_hook,
2569 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2572 static struct address_space_operations btrfs_aops = {
2573 .readpage = btrfs_readpage,
2574 .writepage = btrfs_writepage,
2575 .writepages = btrfs_writepages,
2576 .readpages = btrfs_readpages,
2577 .sync_page = block_sync_page,
2578 .prepare_write = btrfs_prepare_write,
2579 .commit_write = btrfs_commit_write,
2581 .invalidatepage = btrfs_invalidatepage,
2582 .releasepage = btrfs_releasepage,
2583 .set_page_dirty = __set_page_dirty_nobuffers,
2586 static struct address_space_operations btrfs_symlink_aops = {
2587 .readpage = btrfs_readpage,
2588 .writepage = btrfs_writepage,
2589 .invalidatepage = btrfs_invalidatepage,
2590 .releasepage = btrfs_releasepage,
2593 static struct inode_operations btrfs_file_inode_operations = {
2594 .truncate = btrfs_truncate,
2595 .getattr = btrfs_getattr,
2596 .setattr = btrfs_setattr,
2597 .setxattr = generic_setxattr,
2598 .getxattr = generic_getxattr,
2599 .listxattr = btrfs_listxattr,
2600 .removexattr = generic_removexattr,
2603 static struct inode_operations btrfs_special_inode_operations = {
2604 .getattr = btrfs_getattr,
2605 .setattr = btrfs_setattr,
2608 static struct inode_operations btrfs_symlink_inode_operations = {
2609 .readlink = generic_readlink,
2610 .follow_link = page_follow_link_light,
2611 .put_link = page_put_link,