xref: /openbmc/linux/fs/btrfs/transaction.h (revision b6dcefde)
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 	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 
46 struct 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 
57 struct 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 
65 static 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 
71 static 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 
78 static 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 
85 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
86 			  struct btrfs_root *root);
87 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
88 						   int num_blocks);
89 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
90 						   int num_blocks);
91 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r,
92 						   int num_blocks);
93 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
94 				     struct btrfs_root *root);
95 int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
96 			    struct btrfs_root *root);
97 
98 int btrfs_add_dead_root(struct btrfs_root *root);
99 int btrfs_drop_dead_root(struct btrfs_root *root);
100 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
101 int btrfs_clean_old_snapshots(struct btrfs_root *root);
102 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
103 			     struct btrfs_root *root);
104 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
105 				   struct btrfs_root *root);
106 void btrfs_throttle(struct btrfs_root *root);
107 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
108 				struct btrfs_root *root);
109 int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
110 				struct extent_io_tree *dirty_pages, int mark);
111 int btrfs_write_marked_extents(struct btrfs_root *root,
112 				struct extent_io_tree *dirty_pages, int mark);
113 int btrfs_wait_marked_extents(struct btrfs_root *root,
114 				struct extent_io_tree *dirty_pages, int mark);
115 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
116 #endif
117