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 #ifndef __BTRFS_TRANSACTION_H__
20 #define __BTRFS_TRANSACTION_H__
22 #include "kerncompat.h"
27 struct btrfs_trans_handle {
29 u64 alloc_exclude_start;
31 unsigned long blocks_reserved;
32 unsigned long blocks_used;
33 struct btrfs_block_group_cache *block_group;
36 static inline struct btrfs_trans_handle *
37 btrfs_start_transaction(struct btrfs_root *root, int num_blocks)
39 struct btrfs_fs_info *fs_info = root->fs_info;
40 struct btrfs_trans_handle *h = kzalloc(sizeof(*h), GFP_NOFS);
43 return ERR_PTR(-ENOMEM);
44 if (root->commit_root) {
45 error("commit_root aleady set when starting transaction");
47 return ERR_PTR(-EINVAL);
49 if (fs_info->running_transaction) {
50 error("attempt to start transaction over already running one");
52 return ERR_PTR(-EINVAL);
54 fs_info->running_transaction = h;
55 fs_info->generation++;
56 h->transid = fs_info->generation;
57 h->blocks_reserved = num_blocks;
58 root->last_trans = h->transid;
59 root->commit_root = root->node;
60 extent_buffer_get(root->node);