| /* |
| * Copyright (C) 2007 Oracle. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #include "ctree.h" |
| #include "disk-io.h" |
| #include "transaction.h" |
| |
| int btrfs_find_highest_inode(struct btrfs_root *root, u64 *objectid) |
| { |
| struct btrfs_path *path; |
| int ret; |
| struct extent_buffer *l; |
| struct btrfs_key search_key; |
| struct btrfs_key found_key; |
| int slot; |
| |
| path = btrfs_alloc_path(); |
| BUG_ON(!path); |
| |
| search_key.objectid = BTRFS_LAST_FREE_OBJECTID; |
| search_key.type = -1; |
| search_key.offset = (u64)-1; |
| ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); |
| if (ret < 0) |
| goto error; |
| BUG_ON(ret == 0); |
| if (path->slots[0] > 0) { |
| slot = path->slots[0] - 1; |
| l = path->nodes[0]; |
| btrfs_item_key_to_cpu(l, &found_key, slot); |
| *objectid = max_t(u64, found_key.objectid, |
| BTRFS_FIRST_FREE_OBJECTID - 1); |
| } else { |
| *objectid = BTRFS_FIRST_FREE_OBJECTID - 1; |
| } |
| ret = 0; |
| error: |
| btrfs_free_path(path); |
| return ret; |
| } |
| |
| int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 dirid, u64 *objectid) |
| { |
| int ret; |
| mutex_lock(&root->objectid_mutex); |
| |
| if (unlikely(root->highest_objectid < BTRFS_FIRST_FREE_OBJECTID)) { |
| ret = btrfs_find_highest_inode(root, &root->highest_objectid); |
| if (ret) |
| goto out; |
| } |
| |
| if (unlikely(root->highest_objectid >= BTRFS_LAST_FREE_OBJECTID)) { |
| ret = -ENOSPC; |
| goto out; |
| } |
| |
| *objectid = ++root->highest_objectid; |
| ret = 0; |
| out: |
| mutex_unlock(&root->objectid_mutex); |
| return ret; |
| } |