Merge branch 'for-chris' of git://repo.or.cz/btrfs-progs-unstable/devel into raid56
[platform/upstream/btrfs-progs.git] / transaction.h
1 /*
2  * Copyright (C) 2007 Oracle.  All rights reserved.
3  *
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.
7  *
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.
12  *
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.
17  */
18
19 #ifndef __TRANSACTION__
20 #define __TRANSACTION__
21
22 struct btrfs_trans_handle {
23         u64 transid;
24         u64 alloc_exclude_start;
25         u64 alloc_exclude_nr;
26         unsigned long blocks_reserved;
27         unsigned long blocks_used;
28         struct btrfs_block_group_cache *block_group;
29 };
30
31 static inline struct btrfs_trans_handle *
32 btrfs_start_transaction(struct btrfs_root *root, int num_blocks)
33 {
34         struct btrfs_fs_info *fs_info = root->fs_info;
35         struct btrfs_trans_handle *h = malloc(sizeof(*h));
36
37         BUG_ON(!h);
38         BUG_ON(root->commit_root);
39         BUG_ON(fs_info->running_transaction);
40         fs_info->running_transaction = h;
41         fs_info->generation++;
42         h->transid = fs_info->generation;
43         h->alloc_exclude_start = 0;
44         h->alloc_exclude_nr = 0;
45         h->blocks_reserved = num_blocks;
46         h->blocks_used = 0;
47         h->block_group = NULL;
48         root->last_trans = h->transid;
49         root->commit_root = root->node;
50         extent_buffer_get(root->node);
51         return h;
52 }
53
54 static inline void btrfs_free_transaction(struct btrfs_root *root,
55                                           struct btrfs_trans_handle *handle)
56 {
57         memset(handle, 0, sizeof(*handle));
58         free(handle);
59 }
60
61 #endif