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.
21 #include "transaction.h"
23 int btrfs_find_highest_inode(struct btrfs_root *root, u64 *objectid)
25 struct btrfs_path *path;
27 struct extent_buffer *l;
28 struct btrfs_key search_key;
29 struct btrfs_key found_key;
32 path = btrfs_alloc_path();
35 search_key.objectid = BTRFS_LAST_FREE_OBJECTID;
37 search_key.offset = (u64)-1;
38 ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
42 if (path->slots[0] > 0) {
43 slot = path->slots[0] - 1;
45 btrfs_item_key_to_cpu(l, &found_key, slot);
46 *objectid = max_t(u64, found_key.objectid,
47 BTRFS_FIRST_FREE_OBJECTID - 1);
49 *objectid = BTRFS_FIRST_FREE_OBJECTID - 1;
53 btrfs_free_path(path);
57 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
58 struct btrfs_root *root,
59 u64 dirid, u64 *objectid)
62 mutex_lock(&root->objectid_mutex);
64 if (unlikely(root->highest_objectid < BTRFS_FIRST_FREE_OBJECTID)) {
65 ret = btrfs_find_highest_inode(root, &root->highest_objectid);
70 if (unlikely(root->highest_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
75 *objectid = ++root->highest_objectid;
78 mutex_unlock(&root->objectid_mutex);