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 cow_file_range(struct inode *inode, u64 start, u64 end)
77 struct btrfs_root *root = BTRFS_I(inode)->root;
78 struct btrfs_trans_handle *trans;
82 u64 blocksize = root->sectorsize;
86 trans = btrfs_start_transaction(root, 1);
88 btrfs_set_trans_block_group(trans, inode);
90 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
91 num_bytes = max(blocksize, num_bytes);
92 ret = btrfs_drop_extents(trans, root, inode,
93 start, start + num_bytes, start, &alloc_hint);
95 if (alloc_hint == EXTENT_MAP_INLINE)
98 while(num_bytes > 0) {
99 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
100 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
101 root->root_key.objectid,
103 inode->i_ino, start, 0,
104 alloc_hint, (u64)-1, &ins, 1);
109 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
110 start, ins.objectid, ins.offset,
112 num_bytes -= cur_alloc_size;
113 alloc_hint = ins.objectid + ins.offset;
114 start += cur_alloc_size;
117 btrfs_end_transaction(trans, root);
121 static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
127 struct btrfs_root *root = BTRFS_I(inode)->root;
128 struct extent_buffer *leaf;
130 struct btrfs_path *path;
131 struct btrfs_file_extent_item *item;
134 struct btrfs_key found_key;
136 path = btrfs_alloc_path();
139 ret = btrfs_lookup_file_extent(NULL, root, path,
140 inode->i_ino, start, 0);
142 btrfs_free_path(path);
148 if (path->slots[0] == 0)
153 leaf = path->nodes[0];
154 item = btrfs_item_ptr(leaf, path->slots[0],
155 struct btrfs_file_extent_item);
157 /* are we inside the extent that was found? */
158 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
159 found_type = btrfs_key_type(&found_key);
160 if (found_key.objectid != inode->i_ino ||
161 found_type != BTRFS_EXTENT_DATA_KEY) {
165 found_type = btrfs_file_extent_type(leaf, item);
166 extent_start = found_key.offset;
167 if (found_type == BTRFS_FILE_EXTENT_REG) {
168 extent_end = extent_start +
169 btrfs_file_extent_num_bytes(leaf, item);
172 if (start < extent_start || start >= extent_end)
175 cow_end = min(end, extent_end - 1);
176 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
180 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
185 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
190 btrfs_free_path(path);
193 btrfs_release_path(root, path);
197 cow_file_range(inode, start, cow_end);
202 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
204 struct btrfs_root *root = BTRFS_I(inode)->root;
207 mutex_lock(&root->fs_info->fs_mutex);
208 if (btrfs_test_opt(root, NODATACOW))
209 ret = run_delalloc_nocow(inode, start, end);
211 ret = cow_file_range(inode, start, end);
212 mutex_unlock(&root->fs_info->fs_mutex);
216 int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
218 struct inode *inode = page->mapping->host;
219 struct btrfs_root *root = BTRFS_I(inode)->root;
220 struct btrfs_trans_handle *trans;
223 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
224 size_t offset = start - page_start;
226 if (btrfs_test_opt(root, NODATASUM))
229 mutex_lock(&root->fs_info->fs_mutex);
230 trans = btrfs_start_transaction(root, 1);
231 btrfs_set_trans_block_group(trans, inode);
233 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
234 start, kaddr + offset, end - start + 1);
236 ret = btrfs_end_transaction(trans, root);
238 mutex_unlock(&root->fs_info->fs_mutex);
242 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
245 struct inode *inode = page->mapping->host;
246 struct btrfs_root *root = BTRFS_I(inode)->root;
247 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
248 struct btrfs_csum_item *item;
249 struct btrfs_path *path = NULL;
252 if (btrfs_test_opt(root, NODATASUM))
255 mutex_lock(&root->fs_info->fs_mutex);
256 path = btrfs_alloc_path();
257 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
260 /* a csum that isn't present is a preallocated region. */
261 if (ret == -ENOENT || ret == -EFBIG)
266 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
268 set_state_private(em_tree, start, csum);
271 btrfs_free_path(path);
272 mutex_unlock(&root->fs_info->fs_mutex);
276 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
278 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
279 struct inode *inode = page->mapping->host;
280 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
284 struct btrfs_root *root = BTRFS_I(inode)->root;
288 if (btrfs_test_opt(root, NODATASUM))
291 ret = get_state_private(em_tree, start, &private);
292 local_irq_save(flags);
293 kaddr = kmap_atomic(page, KM_IRQ0);
297 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
298 btrfs_csum_final(csum, (char *)&csum);
299 if (csum != private) {
302 kunmap_atomic(kaddr, KM_IRQ0);
303 local_irq_restore(flags);
307 printk("btrfs csum failed ino %lu off %llu\n",
308 page->mapping->host->i_ino, (unsigned long long)start);
309 memset(kaddr + offset, 1, end - start + 1);
310 flush_dcache_page(page);
311 kunmap_atomic(kaddr, KM_IRQ0);
312 local_irq_restore(flags);
316 void btrfs_read_locked_inode(struct inode *inode)
318 struct btrfs_path *path;
319 struct extent_buffer *leaf;
320 struct btrfs_inode_item *inode_item;
321 struct btrfs_inode_timespec *tspec;
322 struct btrfs_root *root = BTRFS_I(inode)->root;
323 struct btrfs_key location;
324 u64 alloc_group_block;
328 path = btrfs_alloc_path();
330 mutex_lock(&root->fs_info->fs_mutex);
332 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
333 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
337 leaf = path->nodes[0];
338 inode_item = btrfs_item_ptr(leaf, path->slots[0],
339 struct btrfs_inode_item);
341 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
342 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
343 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
344 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
345 inode->i_size = btrfs_inode_size(leaf, inode_item);
347 tspec = btrfs_inode_atime(inode_item);
348 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
349 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
351 tspec = btrfs_inode_mtime(inode_item);
352 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
353 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
355 tspec = btrfs_inode_ctime(inode_item);
356 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
357 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
359 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
360 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
362 rdev = btrfs_inode_rdev(leaf, inode_item);
364 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
365 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
368 btrfs_free_path(path);
371 mutex_unlock(&root->fs_info->fs_mutex);
373 switch (inode->i_mode & S_IFMT) {
375 inode->i_mapping->a_ops = &btrfs_aops;
376 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
377 inode->i_fop = &btrfs_file_operations;
378 inode->i_op = &btrfs_file_inode_operations;
381 inode->i_fop = &btrfs_dir_file_operations;
382 if (root == root->fs_info->tree_root)
383 inode->i_op = &btrfs_dir_ro_inode_operations;
385 inode->i_op = &btrfs_dir_inode_operations;
388 inode->i_op = &btrfs_symlink_inode_operations;
389 inode->i_mapping->a_ops = &btrfs_symlink_aops;
392 init_special_inode(inode, inode->i_mode, rdev);
398 btrfs_release_path(root, path);
399 btrfs_free_path(path);
400 mutex_unlock(&root->fs_info->fs_mutex);
401 make_bad_inode(inode);
404 static void fill_inode_item(struct extent_buffer *leaf,
405 struct btrfs_inode_item *item,
408 btrfs_set_inode_uid(leaf, item, inode->i_uid);
409 btrfs_set_inode_gid(leaf, item, inode->i_gid);
410 btrfs_set_inode_size(leaf, item, inode->i_size);
411 btrfs_set_inode_mode(leaf, item, inode->i_mode);
412 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
414 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
415 inode->i_atime.tv_sec);
416 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
417 inode->i_atime.tv_nsec);
419 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
420 inode->i_mtime.tv_sec);
421 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
422 inode->i_mtime.tv_nsec);
424 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
425 inode->i_ctime.tv_sec);
426 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
427 inode->i_ctime.tv_nsec);
429 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
430 btrfs_set_inode_generation(leaf, item, inode->i_generation);
431 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
432 btrfs_set_inode_block_group(leaf, item,
433 BTRFS_I(inode)->block_group->key.objectid);
436 int btrfs_update_inode(struct btrfs_trans_handle *trans,
437 struct btrfs_root *root,
440 struct btrfs_inode_item *inode_item;
441 struct btrfs_path *path;
442 struct extent_buffer *leaf;
445 path = btrfs_alloc_path();
447 ret = btrfs_lookup_inode(trans, root, path,
448 &BTRFS_I(inode)->location, 1);
455 leaf = path->nodes[0];
456 inode_item = btrfs_item_ptr(leaf, path->slots[0],
457 struct btrfs_inode_item);
459 fill_inode_item(leaf, inode_item, inode);
460 btrfs_mark_buffer_dirty(leaf);
461 btrfs_set_inode_last_trans(trans, inode);
464 btrfs_release_path(root, path);
465 btrfs_free_path(path);
470 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
471 struct btrfs_root *root,
473 struct dentry *dentry)
475 struct btrfs_path *path;
476 const char *name = dentry->d_name.name;
477 int name_len = dentry->d_name.len;
479 struct extent_buffer *leaf;
480 struct btrfs_dir_item *di;
481 struct btrfs_key key;
483 path = btrfs_alloc_path();
489 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
499 leaf = path->nodes[0];
500 btrfs_dir_item_key_to_cpu(leaf, di, &key);
501 ret = btrfs_delete_one_dir_name(trans, root, path, di);
504 btrfs_release_path(root, path);
506 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
507 key.objectid, name, name_len, -1);
516 ret = btrfs_delete_one_dir_name(trans, root, path, di);
518 dentry->d_inode->i_ctime = dir->i_ctime;
519 ret = btrfs_del_inode_ref(trans, root, name, name_len,
520 dentry->d_inode->i_ino,
521 dentry->d_parent->d_inode->i_ino);
523 printk("failed to delete reference to %.*s, "
524 "inode %lu parent %lu\n", name_len, name,
525 dentry->d_inode->i_ino,
526 dentry->d_parent->d_inode->i_ino);
529 btrfs_free_path(path);
531 dir->i_size -= name_len * 2;
532 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
533 btrfs_update_inode(trans, root, dir);
534 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
535 dentry->d_inode->i_nlink--;
537 drop_nlink(dentry->d_inode);
539 ret = btrfs_update_inode(trans, root, dentry->d_inode);
540 dir->i_sb->s_dirt = 1;
545 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
547 struct btrfs_root *root;
548 struct btrfs_trans_handle *trans;
552 root = BTRFS_I(dir)->root;
553 mutex_lock(&root->fs_info->fs_mutex);
554 trans = btrfs_start_transaction(root, 1);
556 btrfs_set_trans_block_group(trans, dir);
557 ret = btrfs_unlink_trans(trans, root, dir, dentry);
558 nr = trans->blocks_used;
560 btrfs_end_transaction(trans, root);
561 mutex_unlock(&root->fs_info->fs_mutex);
562 btrfs_btree_balance_dirty(root, nr);
567 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
569 struct inode *inode = dentry->d_inode;
572 struct btrfs_root *root = BTRFS_I(dir)->root;
573 struct btrfs_trans_handle *trans;
576 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
579 mutex_lock(&root->fs_info->fs_mutex);
580 trans = btrfs_start_transaction(root, 1);
581 btrfs_set_trans_block_group(trans, dir);
583 /* now the directory is empty */
584 err = btrfs_unlink_trans(trans, root, dir, dentry);
589 nr = trans->blocks_used;
590 ret = btrfs_end_transaction(trans, root);
591 mutex_unlock(&root->fs_info->fs_mutex);
592 btrfs_btree_balance_dirty(root, nr);
599 static int btrfs_free_inode(struct btrfs_trans_handle *trans,
600 struct btrfs_root *root,
603 struct btrfs_path *path;
608 path = btrfs_alloc_path();
610 ret = btrfs_lookup_inode(trans, root, path,
611 &BTRFS_I(inode)->location, -1);
615 ret = btrfs_del_item(trans, root, path);
616 btrfs_free_path(path);
621 * this can truncate away extent items, csum items and directory items.
622 * It starts at a high offset and removes keys until it can't find
623 * any higher than i_size.
625 * csum items that cross the new i_size are truncated to the new size
628 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
629 struct btrfs_root *root,
633 struct btrfs_path *path;
634 struct btrfs_key key;
635 struct btrfs_key found_key;
637 struct extent_buffer *leaf;
638 struct btrfs_file_extent_item *fi;
639 u64 extent_start = 0;
640 u64 extent_num_bytes = 0;
646 int extent_type = -1;
648 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
649 path = btrfs_alloc_path();
653 /* FIXME, add redo link to tree so we don't leak on crash */
654 key.objectid = inode->i_ino;
655 key.offset = (u64)-1;
659 btrfs_init_path(path);
661 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
666 BUG_ON(path->slots[0] == 0);
669 leaf = path->nodes[0];
670 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
671 found_type = btrfs_key_type(&found_key);
673 if (found_key.objectid != inode->i_ino)
676 if (found_type != BTRFS_CSUM_ITEM_KEY &&
677 found_type != BTRFS_DIR_ITEM_KEY &&
678 found_type != BTRFS_DIR_INDEX_KEY &&
679 found_type != BTRFS_EXTENT_DATA_KEY)
682 item_end = found_key.offset;
683 if (found_type == BTRFS_EXTENT_DATA_KEY) {
684 fi = btrfs_item_ptr(leaf, path->slots[0],
685 struct btrfs_file_extent_item);
686 extent_type = btrfs_file_extent_type(leaf, fi);
687 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
689 btrfs_file_extent_num_bytes(leaf, fi);
690 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
691 struct btrfs_item *item = btrfs_item_nr(leaf,
693 item_end += btrfs_file_extent_inline_len(leaf,
698 if (found_type == BTRFS_CSUM_ITEM_KEY) {
699 ret = btrfs_csum_truncate(trans, root, path,
703 if (item_end < inode->i_size) {
704 if (found_type == BTRFS_DIR_ITEM_KEY) {
705 found_type = BTRFS_INODE_ITEM_KEY;
706 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
707 found_type = BTRFS_CSUM_ITEM_KEY;
708 } else if (found_type) {
713 btrfs_set_key_type(&key, found_type);
714 btrfs_release_path(root, path);
717 if (found_key.offset >= inode->i_size)
723 /* FIXME, shrink the extent if the ref count is only 1 */
724 if (found_type != BTRFS_EXTENT_DATA_KEY)
727 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
729 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
732 btrfs_file_extent_num_bytes(leaf, fi);
733 extent_num_bytes = inode->i_size -
734 found_key.offset + root->sectorsize - 1;
735 btrfs_set_file_extent_num_bytes(leaf, fi,
737 num_dec = (orig_num_bytes -
738 extent_num_bytes) >> 9;
739 if (extent_start != 0) {
740 inode->i_blocks -= num_dec;
742 btrfs_mark_buffer_dirty(leaf);
745 btrfs_file_extent_disk_num_bytes(leaf,
747 /* FIXME blocksize != 4096 */
748 num_dec = btrfs_file_extent_num_bytes(leaf,
750 if (extent_start != 0) {
752 inode->i_blocks -= num_dec;
754 root_gen = btrfs_header_generation(leaf);
755 root_owner = btrfs_header_owner(leaf);
757 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
759 u32 newsize = inode->i_size - found_key.offset;
760 newsize = btrfs_file_extent_calc_inline_size(newsize);
761 ret = btrfs_truncate_item(trans, root, path,
767 ret = btrfs_del_item(trans, root, path);
773 btrfs_release_path(root, path);
775 ret = btrfs_free_extent(trans, root, extent_start,
778 root_gen, inode->i_ino,
779 found_key.offset, 0);
785 btrfs_release_path(root, path);
786 btrfs_free_path(path);
787 inode->i_sb->s_dirt = 1;
791 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
796 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
797 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
798 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
800 WARN_ON(!PageLocked(page));
801 set_page_extent_mapped(page);
803 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
804 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
806 if (zero_start != PAGE_CACHE_SIZE) {
808 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
809 flush_dcache_page(page);
812 set_page_dirty(page);
813 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
819 * taken from block_truncate_page, but does cow as it zeros out
820 * any bytes left in the last page in the file.
822 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
824 struct inode *inode = mapping->host;
825 struct btrfs_root *root = BTRFS_I(inode)->root;
826 u32 blocksize = root->sectorsize;
827 pgoff_t index = from >> PAGE_CACHE_SHIFT;
828 unsigned offset = from & (PAGE_CACHE_SIZE-1);
833 if ((offset & (blocksize - 1)) == 0)
836 down_read(&root->snap_sem);
838 page = grab_cache_page(mapping, index);
841 if (!PageUptodate(page)) {
842 ret = btrfs_readpage(NULL, page);
844 if (!PageUptodate(page)) {
849 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
851 ret = btrfs_cow_one_page(inode, page, offset);
854 page_cache_release(page);
855 up_read(&BTRFS_I(inode)->root->snap_sem);
860 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
862 struct inode *inode = dentry->d_inode;
865 err = inode_change_ok(inode, attr);
869 if (S_ISREG(inode->i_mode) &&
870 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
871 struct btrfs_trans_handle *trans;
872 struct btrfs_root *root = BTRFS_I(inode)->root;
873 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
875 u64 mask = root->sectorsize - 1;
876 u64 pos = (inode->i_size + mask) & ~mask;
877 u64 block_end = attr->ia_size | mask;
881 if (attr->ia_size <= pos)
884 btrfs_truncate_page(inode->i_mapping, inode->i_size);
886 lock_extent(em_tree, pos, block_end, GFP_NOFS);
887 hole_size = (attr->ia_size - pos + mask) & ~mask;
889 mutex_lock(&root->fs_info->fs_mutex);
890 trans = btrfs_start_transaction(root, 1);
891 btrfs_set_trans_block_group(trans, inode);
892 err = btrfs_drop_extents(trans, root, inode,
893 pos, pos + hole_size, pos,
896 if (alloc_hint != EXTENT_MAP_INLINE) {
897 err = btrfs_insert_file_extent(trans, root,
899 pos, 0, 0, hole_size);
901 btrfs_end_transaction(trans, root);
902 mutex_unlock(&root->fs_info->fs_mutex);
903 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
908 err = inode_setattr(inode, attr);
912 void btrfs_delete_inode(struct inode *inode)
914 struct btrfs_trans_handle *trans;
915 struct btrfs_root *root = BTRFS_I(inode)->root;
919 truncate_inode_pages(&inode->i_data, 0);
920 if (is_bad_inode(inode)) {
925 mutex_lock(&root->fs_info->fs_mutex);
926 trans = btrfs_start_transaction(root, 1);
928 btrfs_set_trans_block_group(trans, inode);
929 ret = btrfs_truncate_in_trans(trans, root, inode);
932 ret = btrfs_delete_xattrs(trans, root, inode);
935 ret = btrfs_free_inode(trans, root, inode);
938 nr = trans->blocks_used;
940 btrfs_end_transaction(trans, root);
941 mutex_unlock(&root->fs_info->fs_mutex);
942 btrfs_btree_balance_dirty(root, nr);
946 nr = trans->blocks_used;
947 btrfs_end_transaction(trans, root);
948 mutex_unlock(&root->fs_info->fs_mutex);
949 btrfs_btree_balance_dirty(root, nr);
955 * this returns the key found in the dir entry in the location pointer.
956 * If no dir entries were found, location->objectid is 0.
958 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
959 struct btrfs_key *location)
961 const char *name = dentry->d_name.name;
962 int namelen = dentry->d_name.len;
963 struct btrfs_dir_item *di;
964 struct btrfs_path *path;
965 struct btrfs_root *root = BTRFS_I(dir)->root;
968 if (namelen == 1 && strcmp(name, ".") == 0) {
969 location->objectid = dir->i_ino;
970 location->type = BTRFS_INODE_ITEM_KEY;
971 location->offset = 0;
974 path = btrfs_alloc_path();
977 if (namelen == 2 && strcmp(name, "..") == 0) {
978 struct btrfs_key key;
979 struct extent_buffer *leaf;
983 key.objectid = dir->i_ino;
984 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
986 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
990 leaf = path->nodes[0];
991 slot = path->slots[0];
992 nritems = btrfs_header_nritems(leaf);
996 btrfs_item_key_to_cpu(leaf, &key, slot);
997 if (key.objectid != dir->i_ino ||
998 key.type != BTRFS_INODE_REF_KEY) {
1001 location->objectid = key.offset;
1002 location->type = BTRFS_INODE_ITEM_KEY;
1003 location->offset = 0;
1007 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1011 if (!di || IS_ERR(di)) {
1014 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1016 btrfs_free_path(path);
1019 location->objectid = 0;
1024 * when we hit a tree root in a directory, the btrfs part of the inode
1025 * needs to be changed to reflect the root directory of the tree root. This
1026 * is kind of like crossing a mount point.
1028 static int fixup_tree_root_location(struct btrfs_root *root,
1029 struct btrfs_key *location,
1030 struct btrfs_root **sub_root,
1031 struct dentry *dentry)
1033 struct btrfs_path *path;
1034 struct btrfs_root_item *ri;
1036 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1038 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1041 path = btrfs_alloc_path();
1043 mutex_lock(&root->fs_info->fs_mutex);
1045 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1046 dentry->d_name.name,
1047 dentry->d_name.len);
1048 if (IS_ERR(*sub_root))
1049 return PTR_ERR(*sub_root);
1051 ri = &(*sub_root)->root_item;
1052 location->objectid = btrfs_root_dirid(ri);
1053 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1054 location->offset = 0;
1056 btrfs_free_path(path);
1057 mutex_unlock(&root->fs_info->fs_mutex);
1061 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1063 struct btrfs_iget_args *args = p;
1064 inode->i_ino = args->ino;
1065 BTRFS_I(inode)->root = args->root;
1066 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1067 inode->i_mapping, GFP_NOFS);
1071 static int btrfs_find_actor(struct inode *inode, void *opaque)
1073 struct btrfs_iget_args *args = opaque;
1074 return (args->ino == inode->i_ino &&
1075 args->root == BTRFS_I(inode)->root);
1078 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1079 struct btrfs_root *root)
1081 struct inode *inode;
1082 struct btrfs_iget_args args;
1083 args.ino = objectid;
1086 inode = iget5_locked(s, objectid, btrfs_find_actor,
1087 btrfs_init_locked_inode,
1092 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1093 struct nameidata *nd)
1095 struct inode * inode;
1096 struct btrfs_inode *bi = BTRFS_I(dir);
1097 struct btrfs_root *root = bi->root;
1098 struct btrfs_root *sub_root = root;
1099 struct btrfs_key location;
1102 if (dentry->d_name.len > BTRFS_NAME_LEN)
1103 return ERR_PTR(-ENAMETOOLONG);
1105 mutex_lock(&root->fs_info->fs_mutex);
1106 ret = btrfs_inode_by_name(dir, dentry, &location);
1107 mutex_unlock(&root->fs_info->fs_mutex);
1110 return ERR_PTR(ret);
1113 if (location.objectid) {
1114 ret = fixup_tree_root_location(root, &location, &sub_root,
1117 return ERR_PTR(ret);
1119 return ERR_PTR(-ENOENT);
1120 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1123 return ERR_PTR(-EACCES);
1124 if (inode->i_state & I_NEW) {
1125 /* the inode and parent dir are two different roots */
1126 if (sub_root != root) {
1128 sub_root->inode = inode;
1130 BTRFS_I(inode)->root = sub_root;
1131 memcpy(&BTRFS_I(inode)->location, &location,
1133 btrfs_read_locked_inode(inode);
1134 unlock_new_inode(inode);
1137 return d_splice_alias(inode, dentry);
1140 static unsigned char btrfs_filetype_table[] = {
1141 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1144 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1146 struct inode *inode = filp->f_dentry->d_inode;
1147 struct btrfs_root *root = BTRFS_I(inode)->root;
1148 struct btrfs_item *item;
1149 struct btrfs_dir_item *di;
1150 struct btrfs_key key;
1151 struct btrfs_key found_key;
1152 struct btrfs_path *path;
1155 struct extent_buffer *leaf;
1158 unsigned char d_type;
1163 int key_type = BTRFS_DIR_INDEX_KEY;
1168 /* FIXME, use a real flag for deciding about the key type */
1169 if (root->fs_info->tree_root == root)
1170 key_type = BTRFS_DIR_ITEM_KEY;
1172 /* special case for "." */
1173 if (filp->f_pos == 0) {
1174 over = filldir(dirent, ".", 1,
1182 mutex_lock(&root->fs_info->fs_mutex);
1183 key.objectid = inode->i_ino;
1184 path = btrfs_alloc_path();
1187 /* special case for .., just use the back ref */
1188 if (filp->f_pos == 1) {
1189 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1191 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1193 leaf = path->nodes[0];
1194 slot = path->slots[0];
1195 nritems = btrfs_header_nritems(leaf);
1196 if (slot >= nritems) {
1197 btrfs_release_path(root, path);
1198 goto read_dir_items;
1200 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1201 btrfs_release_path(root, path);
1202 if (found_key.objectid != key.objectid ||
1203 found_key.type != BTRFS_INODE_REF_KEY)
1204 goto read_dir_items;
1205 over = filldir(dirent, "..", 2,
1206 2, found_key.offset, DT_DIR);
1213 btrfs_set_key_type(&key, key_type);
1214 key.offset = filp->f_pos;
1216 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1221 leaf = path->nodes[0];
1222 nritems = btrfs_header_nritems(leaf);
1223 slot = path->slots[0];
1224 if (advance || slot >= nritems) {
1225 if (slot >= nritems -1) {
1226 ret = btrfs_next_leaf(root, path);
1229 leaf = path->nodes[0];
1230 nritems = btrfs_header_nritems(leaf);
1231 slot = path->slots[0];
1238 item = btrfs_item_nr(leaf, slot);
1239 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1241 if (found_key.objectid != key.objectid)
1243 if (btrfs_key_type(&found_key) != key_type)
1245 if (found_key.offset < filp->f_pos)
1248 filp->f_pos = found_key.offset;
1250 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1252 di_total = btrfs_item_size(leaf, item);
1253 while(di_cur < di_total) {
1254 struct btrfs_key location;
1256 name_len = btrfs_dir_name_len(leaf, di);
1257 if (name_len < 32) {
1258 name_ptr = tmp_name;
1260 name_ptr = kmalloc(name_len, GFP_NOFS);
1263 read_extent_buffer(leaf, name_ptr,
1264 (unsigned long)(di + 1), name_len);
1266 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1267 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1269 over = filldir(dirent, name_ptr, name_len,
1274 if (name_ptr != tmp_name)
1279 di_len = btrfs_dir_name_len(leaf, di) +
1280 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1282 di = (struct btrfs_dir_item *)((char *)di + di_len);
1289 btrfs_release_path(root, path);
1290 btrfs_free_path(path);
1291 mutex_unlock(&root->fs_info->fs_mutex);
1295 int btrfs_write_inode(struct inode *inode, int wait)
1297 struct btrfs_root *root = BTRFS_I(inode)->root;
1298 struct btrfs_trans_handle *trans;
1302 mutex_lock(&root->fs_info->fs_mutex);
1303 trans = btrfs_start_transaction(root, 1);
1304 btrfs_set_trans_block_group(trans, inode);
1305 ret = btrfs_commit_transaction(trans, root);
1306 mutex_unlock(&root->fs_info->fs_mutex);
1312 * This is somewhat expensive, updating the tree every time the
1313 * inode changes. But, it is most likely to find the inode in cache.
1314 * FIXME, needs more benchmarking...there are no reasons other than performance
1315 * to keep or drop this code.
1317 void btrfs_dirty_inode(struct inode *inode)
1319 struct btrfs_root *root = BTRFS_I(inode)->root;
1320 struct btrfs_trans_handle *trans;
1322 mutex_lock(&root->fs_info->fs_mutex);
1323 trans = btrfs_start_transaction(root, 1);
1324 btrfs_set_trans_block_group(trans, inode);
1325 btrfs_update_inode(trans, root, inode);
1326 btrfs_end_transaction(trans, root);
1327 mutex_unlock(&root->fs_info->fs_mutex);
1330 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1331 struct btrfs_root *root,
1333 struct btrfs_block_group_cache *group,
1336 struct inode *inode;
1337 struct btrfs_inode_item *inode_item;
1338 struct btrfs_key *location;
1339 struct btrfs_path *path;
1343 path = btrfs_alloc_path();
1346 inode = new_inode(root->fs_info->sb);
1348 return ERR_PTR(-ENOMEM);
1350 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1351 inode->i_mapping, GFP_NOFS);
1352 BTRFS_I(inode)->root = root;
1358 group = btrfs_find_block_group(root, group, 0, 0, owner);
1359 BTRFS_I(inode)->block_group = group;
1361 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
1365 inode->i_uid = current->fsuid;
1366 inode->i_gid = current->fsgid;
1367 inode->i_mode = mode;
1368 inode->i_ino = objectid;
1369 inode->i_blocks = 0;
1370 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1371 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1372 struct btrfs_inode_item);
1373 fill_inode_item(path->nodes[0], inode_item, inode);
1374 btrfs_mark_buffer_dirty(path->nodes[0]);
1375 btrfs_free_path(path);
1377 location = &BTRFS_I(inode)->location;
1378 location->objectid = objectid;
1379 location->offset = 0;
1380 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1382 insert_inode_hash(inode);
1385 btrfs_free_path(path);
1386 return ERR_PTR(ret);
1389 static inline u8 btrfs_inode_type(struct inode *inode)
1391 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1394 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1395 struct dentry *dentry, struct inode *inode)
1398 struct btrfs_key key;
1399 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1400 struct inode *parent_inode;
1402 key.objectid = inode->i_ino;
1403 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1406 ret = btrfs_insert_dir_item(trans, root,
1407 dentry->d_name.name, dentry->d_name.len,
1408 dentry->d_parent->d_inode->i_ino,
1409 &key, btrfs_inode_type(inode));
1411 ret = btrfs_insert_inode_ref(trans, root,
1412 dentry->d_name.name,
1415 dentry->d_parent->d_inode->i_ino);
1416 parent_inode = dentry->d_parent->d_inode;
1417 parent_inode->i_size += dentry->d_name.len * 2;
1418 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1419 ret = btrfs_update_inode(trans, root,
1420 dentry->d_parent->d_inode);
1425 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1426 struct dentry *dentry, struct inode *inode)
1428 int err = btrfs_add_link(trans, dentry, inode);
1430 d_instantiate(dentry, inode);
1438 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1439 int mode, dev_t rdev)
1441 struct btrfs_trans_handle *trans;
1442 struct btrfs_root *root = BTRFS_I(dir)->root;
1443 struct inode *inode;
1449 if (!new_valid_dev(rdev))
1452 mutex_lock(&root->fs_info->fs_mutex);
1453 trans = btrfs_start_transaction(root, 1);
1454 btrfs_set_trans_block_group(trans, dir);
1456 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1462 inode = btrfs_new_inode(trans, root, objectid,
1463 BTRFS_I(dir)->block_group, mode);
1464 err = PTR_ERR(inode);
1468 btrfs_set_trans_block_group(trans, inode);
1469 err = btrfs_add_nondir(trans, dentry, inode);
1473 inode->i_op = &btrfs_special_inode_operations;
1474 init_special_inode(inode, inode->i_mode, rdev);
1475 btrfs_update_inode(trans, root, inode);
1477 dir->i_sb->s_dirt = 1;
1478 btrfs_update_inode_block_group(trans, inode);
1479 btrfs_update_inode_block_group(trans, dir);
1481 nr = trans->blocks_used;
1482 btrfs_end_transaction(trans, root);
1483 mutex_unlock(&root->fs_info->fs_mutex);
1486 inode_dec_link_count(inode);
1489 btrfs_btree_balance_dirty(root, nr);
1493 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1494 int mode, struct nameidata *nd)
1496 struct btrfs_trans_handle *trans;
1497 struct btrfs_root *root = BTRFS_I(dir)->root;
1498 struct inode *inode;
1504 mutex_lock(&root->fs_info->fs_mutex);
1505 trans = btrfs_start_transaction(root, 1);
1506 btrfs_set_trans_block_group(trans, dir);
1508 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1514 inode = btrfs_new_inode(trans, root, objectid,
1515 BTRFS_I(dir)->block_group, mode);
1516 err = PTR_ERR(inode);
1520 btrfs_set_trans_block_group(trans, inode);
1521 err = btrfs_add_nondir(trans, dentry, inode);
1525 inode->i_mapping->a_ops = &btrfs_aops;
1526 inode->i_fop = &btrfs_file_operations;
1527 inode->i_op = &btrfs_file_inode_operations;
1528 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1529 inode->i_mapping, GFP_NOFS);
1530 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
1532 dir->i_sb->s_dirt = 1;
1533 btrfs_update_inode_block_group(trans, inode);
1534 btrfs_update_inode_block_group(trans, dir);
1536 nr = trans->blocks_used;
1537 btrfs_end_transaction(trans, root);
1538 mutex_unlock(&root->fs_info->fs_mutex);
1541 inode_dec_link_count(inode);
1544 btrfs_btree_balance_dirty(root, nr);
1548 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1549 struct dentry *dentry)
1551 struct btrfs_trans_handle *trans;
1552 struct btrfs_root *root = BTRFS_I(dir)->root;
1553 struct inode *inode = old_dentry->d_inode;
1558 if (inode->i_nlink == 0)
1561 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1566 mutex_lock(&root->fs_info->fs_mutex);
1567 trans = btrfs_start_transaction(root, 1);
1569 btrfs_set_trans_block_group(trans, dir);
1570 atomic_inc(&inode->i_count);
1571 err = btrfs_add_nondir(trans, dentry, inode);
1576 dir->i_sb->s_dirt = 1;
1577 btrfs_update_inode_block_group(trans, dir);
1578 err = btrfs_update_inode(trans, root, inode);
1583 nr = trans->blocks_used;
1584 btrfs_end_transaction(trans, root);
1585 mutex_unlock(&root->fs_info->fs_mutex);
1588 inode_dec_link_count(inode);
1591 btrfs_btree_balance_dirty(root, nr);
1595 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1597 struct inode *inode;
1598 struct btrfs_trans_handle *trans;
1599 struct btrfs_root *root = BTRFS_I(dir)->root;
1601 int drop_on_err = 0;
1603 unsigned long nr = 1;
1605 mutex_lock(&root->fs_info->fs_mutex);
1606 trans = btrfs_start_transaction(root, 1);
1607 btrfs_set_trans_block_group(trans, dir);
1609 if (IS_ERR(trans)) {
1610 err = PTR_ERR(trans);
1614 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1620 inode = btrfs_new_inode(trans, root, objectid,
1621 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1622 if (IS_ERR(inode)) {
1623 err = PTR_ERR(inode);
1628 inode->i_op = &btrfs_dir_inode_operations;
1629 inode->i_fop = &btrfs_dir_file_operations;
1630 btrfs_set_trans_block_group(trans, inode);
1633 err = btrfs_update_inode(trans, root, inode);
1637 err = btrfs_add_link(trans, dentry, inode);
1641 d_instantiate(dentry, inode);
1643 dir->i_sb->s_dirt = 1;
1644 btrfs_update_inode_block_group(trans, inode);
1645 btrfs_update_inode_block_group(trans, dir);
1648 nr = trans->blocks_used;
1649 btrfs_end_transaction(trans, root);
1652 mutex_unlock(&root->fs_info->fs_mutex);
1655 btrfs_btree_balance_dirty(root, nr);
1659 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1660 size_t page_offset, u64 start, u64 end,
1666 u64 extent_start = 0;
1668 u64 objectid = inode->i_ino;
1670 int failed_insert = 0;
1671 struct btrfs_path *path;
1672 struct btrfs_root *root = BTRFS_I(inode)->root;
1673 struct btrfs_file_extent_item *item;
1674 struct extent_buffer *leaf;
1675 struct btrfs_key found_key;
1676 struct extent_map *em = NULL;
1677 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1678 struct btrfs_trans_handle *trans = NULL;
1680 path = btrfs_alloc_path();
1682 mutex_lock(&root->fs_info->fs_mutex);
1685 em = lookup_extent_mapping(em_tree, start, end);
1690 em = alloc_extent_map(GFP_NOFS);
1695 em->start = EXTENT_MAP_HOLE;
1696 em->end = EXTENT_MAP_HOLE;
1698 em->bdev = inode->i_sb->s_bdev;
1699 ret = btrfs_lookup_file_extent(trans, root, path,
1700 objectid, start, trans != NULL);
1707 if (path->slots[0] == 0)
1712 leaf = path->nodes[0];
1713 item = btrfs_item_ptr(leaf, path->slots[0],
1714 struct btrfs_file_extent_item);
1715 /* are we inside the extent that was found? */
1716 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1717 found_type = btrfs_key_type(&found_key);
1718 if (found_key.objectid != objectid ||
1719 found_type != BTRFS_EXTENT_DATA_KEY) {
1723 found_type = btrfs_file_extent_type(leaf, item);
1724 extent_start = found_key.offset;
1725 if (found_type == BTRFS_FILE_EXTENT_REG) {
1726 extent_end = extent_start +
1727 btrfs_file_extent_num_bytes(leaf, item);
1729 if (start < extent_start || start >= extent_end) {
1731 if (start < extent_start) {
1732 if (end < extent_start)
1734 em->end = extent_end - 1;
1740 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1742 em->start = extent_start;
1743 em->end = extent_end - 1;
1744 em->block_start = EXTENT_MAP_HOLE;
1745 em->block_end = EXTENT_MAP_HOLE;
1748 bytenr += btrfs_file_extent_offset(leaf, item);
1749 em->block_start = bytenr;
1750 em->block_end = em->block_start +
1751 btrfs_file_extent_num_bytes(leaf, item) - 1;
1752 em->start = extent_start;
1753 em->end = extent_end - 1;
1755 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1759 size_t extent_offset;
1762 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
1764 extent_end = (extent_start + size - 1) |
1765 ((u64)root->sectorsize - 1);
1766 if (start < extent_start || start >= extent_end) {
1768 if (start < extent_start) {
1769 if (end < extent_start)
1771 em->end = extent_end;
1777 em->block_start = EXTENT_MAP_INLINE;
1778 em->block_end = EXTENT_MAP_INLINE;
1781 em->start = extent_start;
1782 em->end = extent_start + size - 1;
1786 extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) -
1787 extent_start + page_offset;
1788 copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
1789 size - extent_offset);
1790 em->start = extent_start + extent_offset;
1791 em->end = (em->start + copy_size -1) |
1792 ((u64)root->sectorsize -1);
1794 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
1795 if (create == 0 && !PageUptodate(page)) {
1796 read_extent_buffer(leaf, map + page_offset, ptr,
1798 flush_dcache_page(page);
1799 } else if (create && PageUptodate(page)) {
1802 free_extent_map(em);
1804 btrfs_release_path(root, path);
1805 trans = btrfs_start_transaction(root, 1);
1808 write_extent_buffer(leaf, map + page_offset, ptr,
1810 btrfs_mark_buffer_dirty(leaf);
1813 set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
1816 printk("unkknown found_type %d\n", found_type);
1823 em->block_start = EXTENT_MAP_HOLE;
1824 em->block_end = EXTENT_MAP_HOLE;
1826 btrfs_release_path(root, path);
1827 if (em->start > start || em->end < start) {
1828 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
1832 ret = add_extent_mapping(em_tree, em);
1833 if (ret == -EEXIST) {
1834 free_extent_map(em);
1836 if (0 && failed_insert == 1) {
1837 btrfs_drop_extent_cache(inode, start, end);
1840 if (failed_insert > 5) {
1841 printk("failing to insert %Lu %Lu\n", start, end);
1849 btrfs_free_path(path);
1851 ret = btrfs_end_transaction(trans, root);
1855 mutex_unlock(&root->fs_info->fs_mutex);
1857 free_extent_map(em);
1859 return ERR_PTR(err);
1864 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
1866 return extent_bmap(mapping, iblock, btrfs_get_extent);
1869 static int btrfs_prepare_write(struct file *file, struct page *page,
1870 unsigned from, unsigned to)
1872 return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree,
1873 page->mapping->host, page, from, to,
1877 int btrfs_readpage(struct file *file, struct page *page)
1879 struct extent_map_tree *tree;
1880 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1881 return extent_read_full_page(tree, page, btrfs_get_extent);
1883 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1885 struct extent_map_tree *tree;
1888 if (current->flags & PF_MEMALLOC) {
1889 redirty_page_for_writepage(wbc, page);
1893 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1894 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
1897 static int btrfs_writepages(struct address_space *mapping,
1898 struct writeback_control *wbc)
1900 struct extent_map_tree *tree;
1901 tree = &BTRFS_I(mapping->host)->extent_tree;
1902 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
1906 btrfs_readpages(struct file *file, struct address_space *mapping,
1907 struct list_head *pages, unsigned nr_pages)
1909 struct extent_map_tree *tree;
1910 tree = &BTRFS_I(mapping->host)->extent_tree;
1911 return extent_readpages(tree, mapping, pages, nr_pages,
1915 static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
1917 struct extent_map_tree *tree;
1920 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1921 ret = try_release_extent_mapping(tree, page);
1923 ClearPagePrivate(page);
1924 set_page_private(page, 0);
1925 page_cache_release(page);
1930 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
1932 struct extent_map_tree *tree;
1934 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1935 extent_invalidatepage(tree, page, offset);
1936 btrfs_releasepage(page, GFP_NOFS);
1940 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1941 * called from a page fault handler when a page is first dirtied. Hence we must
1942 * be careful to check for EOF conditions here. We set the page up correctly
1943 * for a written page which means we get ENOSPC checking when writing into
1944 * holes and correct delalloc and unwritten extent mapping on filesystems that
1945 * support these features.
1947 * We are not allowed to take the i_mutex here so we have to play games to
1948 * protect against truncate races as the page could now be beyond EOF. Because
1949 * vmtruncate() writes the inode size before removing pages, once we have the
1950 * page lock we can determine safely if the page is beyond EOF. If it is not
1951 * beyond EOF, then the page is guaranteed safe against truncation until we
1954 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
1956 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1962 down_read(&BTRFS_I(inode)->root->snap_sem);
1964 wait_on_page_writeback(page);
1965 size = i_size_read(inode);
1966 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1968 if ((page->mapping != inode->i_mapping) ||
1969 (page_start > size)) {
1970 /* page got truncated out from underneath us */
1974 /* page is wholly or partially inside EOF */
1975 if (page_start + PAGE_CACHE_SIZE > size)
1976 end = size & ~PAGE_CACHE_MASK;
1978 end = PAGE_CACHE_SIZE;
1980 ret = btrfs_cow_one_page(inode, page, end);
1983 up_read(&BTRFS_I(inode)->root->snap_sem);
1988 static void btrfs_truncate(struct inode *inode)
1990 struct btrfs_root *root = BTRFS_I(inode)->root;
1992 struct btrfs_trans_handle *trans;
1995 if (!S_ISREG(inode->i_mode))
1997 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2000 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2002 mutex_lock(&root->fs_info->fs_mutex);
2003 trans = btrfs_start_transaction(root, 1);
2004 btrfs_set_trans_block_group(trans, inode);
2006 /* FIXME, add redo link to tree so we don't leak on crash */
2007 ret = btrfs_truncate_in_trans(trans, root, inode);
2008 btrfs_update_inode(trans, root, inode);
2009 nr = trans->blocks_used;
2011 ret = btrfs_end_transaction(trans, root);
2013 mutex_unlock(&root->fs_info->fs_mutex);
2014 btrfs_btree_balance_dirty(root, nr);
2017 int btrfs_commit_write(struct file *file, struct page *page,
2018 unsigned from, unsigned to)
2020 loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
2021 struct inode *inode = page->mapping->host;
2023 btrfs_cow_one_page(inode, page, PAGE_CACHE_SIZE);
2025 if (pos > inode->i_size) {
2026 i_size_write(inode, pos);
2027 mark_inode_dirty(inode);
2032 static int create_subvol(struct btrfs_root *root, char *name, int namelen)
2034 struct btrfs_trans_handle *trans;
2035 struct btrfs_key key;
2036 struct btrfs_root_item root_item;
2037 struct btrfs_inode_item *inode_item;
2038 struct extent_buffer *leaf;
2039 struct btrfs_root *new_root;
2040 struct inode *inode;
2045 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2046 unsigned long nr = 1;
2048 mutex_lock(&root->fs_info->fs_mutex);
2049 trans = btrfs_start_transaction(root, 1);
2052 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2057 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2058 objectid, trans->transid, 0, 0,
2061 return PTR_ERR(leaf);
2063 btrfs_set_header_nritems(leaf, 0);
2064 btrfs_set_header_level(leaf, 0);
2065 btrfs_set_header_bytenr(leaf, leaf->start);
2066 btrfs_set_header_generation(leaf, trans->transid);
2067 btrfs_set_header_owner(leaf, objectid);
2069 write_extent_buffer(leaf, root->fs_info->fsid,
2070 (unsigned long)btrfs_header_fsid(leaf),
2072 btrfs_mark_buffer_dirty(leaf);
2074 inode_item = &root_item.inode;
2075 memset(inode_item, 0, sizeof(*inode_item));
2076 inode_item->generation = cpu_to_le64(1);
2077 inode_item->size = cpu_to_le64(3);
2078 inode_item->nlink = cpu_to_le32(1);
2079 inode_item->nblocks = cpu_to_le64(1);
2080 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2082 btrfs_set_root_bytenr(&root_item, leaf->start);
2083 btrfs_set_root_level(&root_item, 0);
2084 btrfs_set_root_refs(&root_item, 1);
2085 btrfs_set_root_used(&root_item, 0);
2087 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2088 root_item.drop_level = 0;
2090 free_extent_buffer(leaf);
2093 btrfs_set_root_dirid(&root_item, new_dirid);
2095 key.objectid = objectid;
2097 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2098 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2104 * insert the directory item
2106 key.offset = (u64)-1;
2107 dir = root->fs_info->sb->s_root->d_inode;
2108 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2109 name, namelen, dir->i_ino, &key,
2114 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2115 name, namelen, objectid,
2116 root->fs_info->sb->s_root->d_inode->i_ino);
2120 ret = btrfs_commit_transaction(trans, root);
2124 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2127 trans = btrfs_start_transaction(new_root, 1);
2130 inode = btrfs_new_inode(trans, new_root, new_dirid,
2131 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2134 inode->i_op = &btrfs_dir_inode_operations;
2135 inode->i_fop = &btrfs_dir_file_operations;
2136 new_root->inode = inode;
2138 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2142 ret = btrfs_update_inode(trans, new_root, inode);
2146 nr = trans->blocks_used;
2147 err = btrfs_commit_transaction(trans, root);
2151 mutex_unlock(&root->fs_info->fs_mutex);
2152 btrfs_btree_balance_dirty(root, nr);
2156 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2158 struct btrfs_trans_handle *trans;
2159 struct btrfs_key key;
2160 struct btrfs_root_item new_root_item;
2161 struct extent_buffer *tmp;
2167 if (!root->ref_cows)
2170 down_write(&root->snap_sem);
2171 freeze_bdev(root->fs_info->sb->s_bdev);
2172 thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb);
2174 mutex_lock(&root->fs_info->fs_mutex);
2175 trans = btrfs_start_transaction(root, 1);
2178 ret = btrfs_update_inode(trans, root, root->inode);
2182 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2187 memcpy(&new_root_item, &root->root_item,
2188 sizeof(new_root_item));
2190 key.objectid = objectid;
2192 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2194 extent_buffer_get(root->node);
2195 btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
2196 free_extent_buffer(tmp);
2198 btrfs_copy_root(trans, root, root->node, &tmp, objectid);
2200 btrfs_set_root_bytenr(&new_root_item, tmp->start);
2201 btrfs_set_root_level(&new_root_item, btrfs_header_level(tmp));
2202 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2204 free_extent_buffer(tmp);
2209 * insert the directory item
2211 key.offset = (u64)-1;
2212 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2214 root->fs_info->sb->s_root->d_inode->i_ino,
2215 &key, BTRFS_FT_DIR);
2220 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2221 name, namelen, objectid,
2222 root->fs_info->sb->s_root->d_inode->i_ino);
2227 nr = trans->blocks_used;
2228 err = btrfs_commit_transaction(trans, root);
2233 mutex_unlock(&root->fs_info->fs_mutex);
2234 up_write(&root->snap_sem);
2235 btrfs_btree_balance_dirty(root, nr);
2239 static unsigned long force_ra(struct address_space *mapping,
2240 struct file_ra_state *ra, struct file *file,
2241 pgoff_t offset, pgoff_t last_index)
2245 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2246 req_size = last_index - offset + 1;
2247 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2250 req_size = min(last_index - offset + 1, (pgoff_t)128);
2251 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2252 return offset + req_size;
2256 int btrfs_defrag_file(struct file *file) {
2257 struct inode *inode = fdentry(file)->d_inode;
2258 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2260 unsigned long last_index;
2261 unsigned long ra_index = 0;
2266 mutex_lock(&inode->i_mutex);
2267 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2268 for (i = 0; i <= last_index; i++) {
2269 if (i == ra_index) {
2270 ra_index = force_ra(inode->i_mapping, &file->f_ra,
2271 file, ra_index, last_index);
2273 page = grab_cache_page(inode->i_mapping, i);
2276 if (!PageUptodate(page)) {
2277 btrfs_readpage(NULL, page);
2279 if (!PageUptodate(page)) {
2281 page_cache_release(page);
2285 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2286 page_end = page_start + PAGE_CACHE_SIZE - 1;
2288 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
2289 set_extent_delalloc(em_tree, page_start,
2290 page_end, GFP_NOFS);
2291 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
2292 set_page_dirty(page);
2294 page_cache_release(page);
2295 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2299 mutex_unlock(&inode->i_mutex);
2303 static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
2305 struct btrfs_ioctl_vol_args *vol_args;
2306 struct btrfs_dir_item *di;
2307 struct btrfs_path *path;
2312 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2317 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2322 namelen = strlen(vol_args->name);
2323 if (namelen > BTRFS_VOL_NAME_MAX) {
2327 if (strchr(vol_args->name, '/')) {
2332 path = btrfs_alloc_path();
2338 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2339 mutex_lock(&root->fs_info->fs_mutex);
2340 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2342 vol_args->name, namelen, 0);
2343 mutex_unlock(&root->fs_info->fs_mutex);
2344 btrfs_free_path(path);
2346 if (di && !IS_ERR(di)) {
2356 if (root == root->fs_info->tree_root)
2357 ret = create_subvol(root, vol_args->name, namelen);
2359 ret = create_snapshot(root, vol_args->name, namelen);
2365 static int btrfs_ioctl_defrag(struct file *file)
2367 struct inode *inode = fdentry(file)->d_inode;
2368 struct btrfs_root *root = BTRFS_I(inode)->root;
2370 switch (inode->i_mode & S_IFMT) {
2372 mutex_lock(&root->fs_info->fs_mutex);
2373 btrfs_defrag_root(root, 0);
2374 btrfs_defrag_root(root->fs_info->extent_root, 0);
2375 mutex_unlock(&root->fs_info->fs_mutex);
2378 btrfs_defrag_file(file);
2385 long btrfs_ioctl(struct file *file, unsigned int
2386 cmd, unsigned long arg)
2388 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
2391 case BTRFS_IOC_SNAP_CREATE:
2392 return btrfs_ioctl_snap_create(root, (void __user *)arg);
2393 case BTRFS_IOC_DEFRAG:
2394 return btrfs_ioctl_defrag(file);
2401 * Called inside transaction, so use GFP_NOFS
2403 struct inode *btrfs_alloc_inode(struct super_block *sb)
2405 struct btrfs_inode *ei;
2407 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2411 return &ei->vfs_inode;
2414 void btrfs_destroy_inode(struct inode *inode)
2416 WARN_ON(!list_empty(&inode->i_dentry));
2417 WARN_ON(inode->i_data.nrpages);
2419 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2422 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2423 static void init_once(struct kmem_cache * cachep, void *foo)
2425 static void init_once(void * foo, struct kmem_cache * cachep,
2426 unsigned long flags)
2429 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2431 inode_init_once(&ei->vfs_inode);
2434 void btrfs_destroy_cachep(void)
2436 if (btrfs_inode_cachep)
2437 kmem_cache_destroy(btrfs_inode_cachep);
2438 if (btrfs_trans_handle_cachep)
2439 kmem_cache_destroy(btrfs_trans_handle_cachep);
2440 if (btrfs_transaction_cachep)
2441 kmem_cache_destroy(btrfs_transaction_cachep);
2442 if (btrfs_bit_radix_cachep)
2443 kmem_cache_destroy(btrfs_bit_radix_cachep);
2444 if (btrfs_path_cachep)
2445 kmem_cache_destroy(btrfs_path_cachep);
2448 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
2449 unsigned long extra_flags,
2450 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2451 void (*ctor)(struct kmem_cache *, void *)
2453 void (*ctor)(void *, struct kmem_cache *,
2458 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2459 SLAB_MEM_SPREAD | extra_flags), ctor
2460 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2466 int btrfs_init_cachep(void)
2468 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
2469 sizeof(struct btrfs_inode),
2471 if (!btrfs_inode_cachep)
2473 btrfs_trans_handle_cachep =
2474 btrfs_cache_create("btrfs_trans_handle_cache",
2475 sizeof(struct btrfs_trans_handle),
2477 if (!btrfs_trans_handle_cachep)
2479 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
2480 sizeof(struct btrfs_transaction),
2482 if (!btrfs_transaction_cachep)
2484 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
2485 sizeof(struct btrfs_path),
2487 if (!btrfs_path_cachep)
2489 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
2490 SLAB_DESTROY_BY_RCU, NULL);
2491 if (!btrfs_bit_radix_cachep)
2495 btrfs_destroy_cachep();
2499 static int btrfs_getattr(struct vfsmount *mnt,
2500 struct dentry *dentry, struct kstat *stat)
2502 struct inode *inode = dentry->d_inode;
2503 generic_fillattr(inode, stat);
2504 stat->blksize = 256 * 1024;
2508 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2509 struct inode * new_dir,struct dentry *new_dentry)
2511 struct btrfs_trans_handle *trans;
2512 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2513 struct inode *new_inode = new_dentry->d_inode;
2514 struct inode *old_inode = old_dentry->d_inode;
2515 struct timespec ctime = CURRENT_TIME;
2516 struct btrfs_path *path;
2519 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2520 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2524 mutex_lock(&root->fs_info->fs_mutex);
2525 trans = btrfs_start_transaction(root, 1);
2527 btrfs_set_trans_block_group(trans, new_dir);
2528 path = btrfs_alloc_path();
2534 old_dentry->d_inode->i_nlink++;
2535 old_dir->i_ctime = old_dir->i_mtime = ctime;
2536 new_dir->i_ctime = new_dir->i_mtime = ctime;
2537 old_inode->i_ctime = ctime;
2539 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2544 new_inode->i_ctime = CURRENT_TIME;
2545 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2549 ret = btrfs_add_link(trans, new_dentry, old_inode);
2554 btrfs_free_path(path);
2555 btrfs_end_transaction(trans, root);
2556 mutex_unlock(&root->fs_info->fs_mutex);
2560 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2561 const char *symname)
2563 struct btrfs_trans_handle *trans;
2564 struct btrfs_root *root = BTRFS_I(dir)->root;
2565 struct btrfs_path *path;
2566 struct btrfs_key key;
2567 struct inode *inode;
2574 struct btrfs_file_extent_item *ei;
2575 struct extent_buffer *leaf;
2578 name_len = strlen(symname) + 1;
2579 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2580 return -ENAMETOOLONG;
2581 mutex_lock(&root->fs_info->fs_mutex);
2582 trans = btrfs_start_transaction(root, 1);
2583 btrfs_set_trans_block_group(trans, dir);
2585 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2591 inode = btrfs_new_inode(trans, root, objectid,
2592 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2593 err = PTR_ERR(inode);
2597 btrfs_set_trans_block_group(trans, inode);
2598 err = btrfs_add_nondir(trans, dentry, inode);
2602 inode->i_mapping->a_ops = &btrfs_aops;
2603 inode->i_fop = &btrfs_file_operations;
2604 inode->i_op = &btrfs_file_inode_operations;
2605 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2606 inode->i_mapping, GFP_NOFS);
2607 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
2609 dir->i_sb->s_dirt = 1;
2610 btrfs_update_inode_block_group(trans, inode);
2611 btrfs_update_inode_block_group(trans, dir);
2615 path = btrfs_alloc_path();
2617 key.objectid = inode->i_ino;
2619 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2620 datasize = btrfs_file_extent_calc_inline_size(name_len);
2621 err = btrfs_insert_empty_item(trans, root, path, &key,
2627 leaf = path->nodes[0];
2628 ei = btrfs_item_ptr(leaf, path->slots[0],
2629 struct btrfs_file_extent_item);
2630 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2631 btrfs_set_file_extent_type(leaf, ei,
2632 BTRFS_FILE_EXTENT_INLINE);
2633 ptr = btrfs_file_extent_inline_start(ei);
2634 write_extent_buffer(leaf, symname, ptr, name_len);
2635 btrfs_mark_buffer_dirty(leaf);
2636 btrfs_free_path(path);
2638 inode->i_op = &btrfs_symlink_inode_operations;
2639 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2640 inode->i_size = name_len - 1;
2641 err = btrfs_update_inode(trans, root, inode);
2646 nr = trans->blocks_used;
2647 btrfs_end_transaction(trans, root);
2648 mutex_unlock(&root->fs_info->fs_mutex);
2650 inode_dec_link_count(inode);
2653 btrfs_btree_balance_dirty(root, nr);
2657 static struct inode_operations btrfs_dir_inode_operations = {
2658 .lookup = btrfs_lookup,
2659 .create = btrfs_create,
2660 .unlink = btrfs_unlink,
2662 .mkdir = btrfs_mkdir,
2663 .rmdir = btrfs_rmdir,
2664 .rename = btrfs_rename,
2665 .symlink = btrfs_symlink,
2666 .setattr = btrfs_setattr,
2667 .mknod = btrfs_mknod,
2668 .setxattr = generic_setxattr,
2669 .getxattr = generic_getxattr,
2670 .listxattr = btrfs_listxattr,
2671 .removexattr = generic_removexattr,
2674 static struct inode_operations btrfs_dir_ro_inode_operations = {
2675 .lookup = btrfs_lookup,
2678 static struct file_operations btrfs_dir_file_operations = {
2679 .llseek = generic_file_llseek,
2680 .read = generic_read_dir,
2681 .readdir = btrfs_readdir,
2682 .unlocked_ioctl = btrfs_ioctl,
2683 #ifdef CONFIG_COMPAT
2684 .compat_ioctl = btrfs_ioctl,
2688 static struct extent_map_ops btrfs_extent_map_ops = {
2689 .fill_delalloc = run_delalloc_range,
2690 .writepage_io_hook = btrfs_writepage_io_hook,
2691 .readpage_io_hook = btrfs_readpage_io_hook,
2692 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2695 static struct address_space_operations btrfs_aops = {
2696 .readpage = btrfs_readpage,
2697 .writepage = btrfs_writepage,
2698 .writepages = btrfs_writepages,
2699 .readpages = btrfs_readpages,
2700 .sync_page = block_sync_page,
2701 .prepare_write = btrfs_prepare_write,
2702 .commit_write = btrfs_commit_write,
2704 .invalidatepage = btrfs_invalidatepage,
2705 .releasepage = btrfs_releasepage,
2706 .set_page_dirty = __set_page_dirty_nobuffers,
2709 static struct address_space_operations btrfs_symlink_aops = {
2710 .readpage = btrfs_readpage,
2711 .writepage = btrfs_writepage,
2712 .invalidatepage = btrfs_invalidatepage,
2713 .releasepage = btrfs_releasepage,
2716 static struct inode_operations btrfs_file_inode_operations = {
2717 .truncate = btrfs_truncate,
2718 .getattr = btrfs_getattr,
2719 .setattr = btrfs_setattr,
2720 .setxattr = generic_setxattr,
2721 .getxattr = generic_getxattr,
2722 .listxattr = btrfs_listxattr,
2723 .removexattr = generic_removexattr,
2726 static struct inode_operations btrfs_special_inode_operations = {
2727 .getattr = btrfs_getattr,
2728 .setattr = btrfs_setattr,
2731 static struct inode_operations btrfs_symlink_inode_operations = {
2732 .readlink = generic_readlink,
2733 .follow_link = page_follow_link_light,
2734 .put_link = page_put_link,