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
24 struct btrfs_transaction {
25 u64 transid;
26 /*
27 * total writers in this transaction, it must be zero before the
28 * transaction can end
29 */
30 atomic_t num_writers;
31
32 unsigned long num_joined;
33 int in_commit;
34 atomic_t 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
46 struct btrfs_trans_handle {
47 u64 transid;
48 u64 block_group;
49 u64 bytes_reserved;
50 unsigned long blocks_reserved;
51 unsigned long blocks_used;
52 unsigned long delayed_ref_updates;
53 struct btrfs_transaction *transaction;
54 struct btrfs_block_rsv *block_rsv;
55 };
56
57 struct btrfs_pending_snapshot {
58 struct dentry *dentry;
59 struct btrfs_root *root;
60 struct btrfs_root *snap;
61 /* block reservation for the operation */
62 struct btrfs_block_rsv block_rsv;
63 /* extra metadata reseration for relocation */
64 int error;
65 bool readonly;
66 struct list_head list;
67 };
68
btrfs_set_trans_block_group(struct btrfs_trans_handle * trans,struct inode * inode)69 static inline void btrfs_set_trans_block_group(struct btrfs_trans_handle *trans,
70 struct inode *inode)
71 {
72 trans->block_group = BTRFS_I(inode)->block_group;
73 }
74
btrfs_update_inode_block_group(struct btrfs_trans_handle * trans,struct inode * inode)75 static inline void btrfs_update_inode_block_group(
76 struct btrfs_trans_handle *trans,
77 struct inode *inode)
78 {
79 BTRFS_I(inode)->block_group = trans->block_group;
80 }
81
btrfs_set_inode_last_trans(struct btrfs_trans_handle * trans,struct inode * inode)82 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
83 struct inode *inode)
84 {
85 BTRFS_I(inode)->last_trans = trans->transaction->transid;
86 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
87 }
88
89 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
90 struct btrfs_root *root);
91 int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans,
92 struct btrfs_root *root);
93 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
94 int num_items);
95 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
96 int num_blocks);
97 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root,
98 int num_blocks);
99 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r,
100 int num_blocks);
101 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
102 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
103 struct btrfs_root *root);
104 int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
105 struct btrfs_root *root);
106
107 int btrfs_add_dead_root(struct btrfs_root *root);
108 int btrfs_drop_dead_root(struct btrfs_root *root);
109 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
110 int btrfs_clean_old_snapshots(struct btrfs_root *root);
111 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
112 struct btrfs_root *root);
113 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
114 struct btrfs_root *root,
115 int wait_for_unblock);
116 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
117 struct btrfs_root *root);
118 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
119 struct btrfs_root *root);
120 void btrfs_throttle(struct btrfs_root *root);
121 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
122 struct btrfs_root *root);
123 int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
124 struct extent_io_tree *dirty_pages, int mark);
125 int btrfs_write_marked_extents(struct btrfs_root *root,
126 struct extent_io_tree *dirty_pages, int mark);
127 int btrfs_wait_marked_extents(struct btrfs_root *root,
128 struct extent_io_tree *dirty_pages, int mark);
129 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
130 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
131 #endif
132