1 #include <linux/module.h>
4 #include "transaction.h"
6 int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
7 struct btrfs_root *root,
8 u64 objectid, u64 offset,
9 u64 num_blocks, u64 hint_block,
14 struct btrfs_file_extent_item *item;
15 struct btrfs_key file_key;
16 struct btrfs_path path;
18 btrfs_init_path(&path);
19 ret = btrfs_alloc_extent(trans, root, num_blocks, hint_block,
20 (u64)-1, objectid, &ins);
22 file_key.objectid = objectid;
23 file_key.offset = offset;
25 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
27 ret = btrfs_insert_empty_item(trans, root, &path, &file_key,
29 item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
30 struct btrfs_file_extent_item);
31 btrfs_set_file_extent_disk_blocknr(item, ins.objectid);
32 btrfs_set_file_extent_disk_num_blocks(item, ins.offset);
33 btrfs_set_file_extent_offset(item, 0);
34 btrfs_set_file_extent_num_blocks(item, ins.offset);
35 mark_buffer_dirty(path.nodes[0]);
36 *result = ins.objectid;
37 btrfs_release_path(root, &path);
41 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
42 struct btrfs_root *root,
43 struct btrfs_path *path, u64 objectid,
44 u64 blocknr, u64 num_blocks, int mod)
47 struct btrfs_key file_key;
48 int ins_len = mod < 0 ? -1 : 0;
51 file_key.objectid = objectid;
52 file_key.offset = blocknr;
54 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
55 ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);