btrfs_start_transaction: wait for commits in progress to finish
[safe/jmp/linux-2.6] / fs / btrfs / 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 __BTRFS_TRANSACTION__
20 #define __BTRFS_TRANSACTION__
21 #include "btrfs_inode.h"
22
23 struct btrfs_transaction {
24         u64 transid;
25         unsigned long num_writers;
26         unsigned long num_joined;
27         int in_commit;
28         int use_count;
29         int commit_done;
30         int blocked;
31         struct list_head list;
32         struct extent_io_tree dirty_pages;
33         unsigned long start_time;
34         wait_queue_head_t writer_wait;
35         wait_queue_head_t commit_wait;
36         struct list_head pending_snapshots;
37 };
38
39 struct btrfs_trans_handle {
40         u64 transid;
41         unsigned long blocks_reserved;
42         unsigned long blocks_used;
43         struct btrfs_transaction *transaction;
44         struct btrfs_block_group_cache *block_group;
45         u64 alloc_exclude_start;
46         u64 alloc_exclude_nr;
47 };
48
49 struct btrfs_pending_snapshot {
50         struct btrfs_root *root;
51         char *name;
52         struct list_head list;
53 };
54
55
56 static inline void btrfs_set_trans_block_group(struct btrfs_trans_handle *trans,
57                                                struct inode *inode)
58 {
59         trans->block_group = BTRFS_I(inode)->block_group;
60 }
61
62 static inline void btrfs_update_inode_block_group(struct
63                                                   btrfs_trans_handle *trans,
64                                                   struct inode *inode)
65 {
66         BTRFS_I(inode)->block_group = trans->block_group;
67 }
68
69 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
70                                               struct inode *inode)
71 {
72         BTRFS_I(inode)->last_trans = trans->transaction->transid;
73 }
74
75 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
76                           struct btrfs_root *root);
77 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
78                                                    int num_blocks);
79 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
80                                                    int num_blocks);
81 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
82                                      struct btrfs_root *root);
83 int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
84                             struct btrfs_root *root);
85
86 int btrfs_add_dead_root(struct btrfs_root *root, struct btrfs_root *latest,
87                         struct list_head *dead_list);
88 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
89 int btrfs_clean_old_snapshots(struct btrfs_root *root);
90 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
91                              struct btrfs_root *root);
92 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
93                                    struct btrfs_root *root);
94 #endif