Root/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#include "delayed-ref.h"
23
24struct btrfs_transaction {
25    u64 transid;
26    /*
27     * total writers in this transaction, it must be zero before the
28     * transaction can end
29     */
30    unsigned long num_writers;
31
32    unsigned long num_joined;
33    int in_commit;
34    int use_count;
35    int commit_done;
36    int blocked;
37    struct list_head list;
38    struct extent_io_tree dirty_pages;
39    unsigned long start_time;
40    wait_queue_head_t writer_wait;
41    wait_queue_head_t commit_wait;
42    struct list_head pending_snapshots;
43    struct btrfs_delayed_ref_root delayed_refs;
44};
45
46struct btrfs_trans_handle {
47    u64 transid;
48    unsigned long blocks_reserved;
49    unsigned long blocks_used;
50    struct btrfs_transaction *transaction;
51    u64 block_group;
52    u64 alloc_exclude_start;
53    u64 alloc_exclude_nr;
54    unsigned long delayed_ref_updates;
55};
56
57struct btrfs_pending_snapshot {
58    struct dentry *dentry;
59    struct btrfs_root *root;
60    char *name;
61    struct btrfs_key root_key;
62    struct list_head list;
63};
64
65static inline void btrfs_set_trans_block_group(struct btrfs_trans_handle *trans,
66                           struct inode *inode)
67{
68    trans->block_group = BTRFS_I(inode)->block_group;
69}
70
71static inline void btrfs_update_inode_block_group(
72                      struct btrfs_trans_handle *trans,
73                      struct inode *inode)
74{
75    BTRFS_I(inode)->block_group = trans->block_group;
76}
77
78static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
79                          struct inode *inode)
80{
81    BTRFS_I(inode)->last_trans = trans->transaction->transid;
82    BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
83}
84
85int btrfs_end_transaction(struct btrfs_trans_handle *trans,
86              struct btrfs_root *root);
87struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
88                           int num_blocks);
89struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
90                           int num_blocks);
91struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r,
92                           int num_blocks);
93int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
94                     struct btrfs_root *root);
95int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
96                struct btrfs_root *root);
97
98int btrfs_add_dead_root(struct btrfs_root *root);
99int btrfs_drop_dead_root(struct btrfs_root *root);
100int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
101int btrfs_clean_old_snapshots(struct btrfs_root *root);
102int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
103                 struct btrfs_root *root);
104int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
105                   struct btrfs_root *root);
106void btrfs_throttle(struct btrfs_root *root);
107int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
108                struct btrfs_root *root);
109int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
110                struct extent_io_tree *dirty_pages, int mark);
111int btrfs_write_marked_extents(struct btrfs_root *root,
112                struct extent_io_tree *dirty_pages, int mark);
113int btrfs_wait_marked_extents(struct btrfs_root *root,
114                struct extent_io_tree *dirty_pages, int mark);
115int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
116#endif
117

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