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 "kerncompat.h"
22 #include "radix-tree.h"
25 #include "transaction.h"
28 * walks the btree of allocated inodes and find a hole.
30 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
31 struct btrfs_root *root,
32 u64 dirid, u64 *objectid)
34 struct btrfs_path path;
42 struct btrfs_key search_key;
43 u64 search_start = dirid;
45 if (root->fs_info->last_inode_alloc_dirid == dirid)
46 search_start = root->fs_info->last_inode_alloc;
48 if (search_start < BTRFS_FIRST_FREE_OBJECTID)
49 search_start = BTRFS_FIRST_FREE_OBJECTID;
50 search_key.objectid = search_start;
52 search_key.offset = 0;
54 btrfs_init_path(&path);
56 ret = btrfs_search_slot(trans, root, &search_key, &path, 0, 0);
60 if (path.slots[0] > 0)
64 l = &path.nodes[0]->leaf;
66 if (slot >= btrfs_header_nritems(&l->header)) {
67 ret = btrfs_next_leaf(root, &path);
73 *objectid = search_start;
77 *objectid = last_ino > search_start ?
78 last_ino : search_start;
81 btrfs_disk_key_to_cpu(&key, &l->items[slot].key);
82 if (key.objectid >= search_start) {
84 if (last_ino < search_start)
85 last_ino = search_start;
86 hole_size = key.objectid - last_ino;
94 last_ino = key.objectid + 1;
99 root->fs_info->last_inode_alloc = *objectid;
100 root->fs_info->last_inode_alloc_dirid = dirid;
101 btrfs_release_path(root, &path);
102 BUG_ON(*objectid < search_start);
105 btrfs_release_path(root, &path);