Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
transaction.h
Go to the documentation of this file.
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 #include "ctree.h"
24 
25 struct btrfs_transaction {
26  u64 transid;
27  /*
28  * total writers in this transaction, it must be zero before the
29  * transaction can end
30  */
31  atomic_t num_writers;
32  atomic_t use_count;
33 
34  unsigned long num_joined;
35 
36  spinlock_t commit_lock;
37  int in_commit;
38  int commit_done;
39  int blocked;
40  struct list_head list;
41  struct extent_io_tree dirty_pages;
42  unsigned long start_time;
43  wait_queue_head_t writer_wait;
44  wait_queue_head_t commit_wait;
45  struct list_head pending_snapshots;
46  struct btrfs_delayed_ref_root delayed_refs;
47  int aborted;
48 };
49 
50 enum btrfs_trans_type {
51  TRANS_START,
52  TRANS_JOIN,
53  TRANS_USERSPACE,
54  TRANS_JOIN_NOLOCK,
55  TRANS_ATTACH,
56 };
57 
58 struct btrfs_trans_handle {
59  u64 transid;
60  u64 bytes_reserved;
61  u64 qgroup_reserved;
62  unsigned long use_count;
63  unsigned long blocks_reserved;
64  unsigned long blocks_used;
65  unsigned long delayed_ref_updates;
66  struct btrfs_transaction *transaction;
67  struct btrfs_block_rsv *block_rsv;
68  struct btrfs_block_rsv *orig_rsv;
69  short aborted;
70  short adding_csums;
71  enum btrfs_trans_type type;
72  /*
73  * this root is only needed to validate that the root passed to
74  * start_transaction is the same as the one passed to end_transaction.
75  * Subvolume quota depends on this
76  */
77  struct btrfs_root *root;
78  struct seq_list delayed_ref_elem;
79  struct list_head qgroup_ref_list;
80  struct list_head new_bgs;
81 };
82 
83 struct btrfs_pending_snapshot {
84  struct dentry *dentry;
85  struct btrfs_root *root;
86  struct btrfs_root *snap;
87  struct btrfs_qgroup_inherit *inherit;
88  /* block reservation for the operation */
89  struct btrfs_block_rsv block_rsv;
90  /* extra metadata reseration for relocation */
91  int error;
92  bool readonly;
93  struct list_head list;
94 };
95 
96 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
97  struct inode *inode)
98 {
99  BTRFS_I(inode)->last_trans = trans->transaction->transid;
100  BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
101  BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
102 }
103 
104 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
105  struct btrfs_root *root);
106 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
107  int num_items);
108 struct btrfs_trans_handle *btrfs_start_transaction_noflush(
109  struct btrfs_root *root, int num_items);
110 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
111 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
112 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
113 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
114 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
115 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
116  struct btrfs_root *root);
117 
118 int btrfs_add_dead_root(struct btrfs_root *root);
119 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
120 int btrfs_clean_old_snapshots(struct btrfs_root *root);
121 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
122  struct btrfs_root *root);
123 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
124  struct btrfs_root *root,
125  int wait_for_unblock);
126 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
127  struct btrfs_root *root);
128 int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans,
129  struct btrfs_root *root);
130 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
131  struct btrfs_root *root);
132 void btrfs_throttle(struct btrfs_root *root);
133 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
134  struct btrfs_root *root);
135 int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
136  struct extent_io_tree *dirty_pages, int mark);
137 int btrfs_write_marked_extents(struct btrfs_root *root,
138  struct extent_io_tree *dirty_pages, int mark);
139 int btrfs_wait_marked_extents(struct btrfs_root *root,
140  struct extent_io_tree *dirty_pages, int mark);
141 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
142 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
143 void put_transaction(struct btrfs_transaction *transaction);
144 #endif
Generated on Thu Jan 10 2013 14:45:46 for Linux Kernel by   doxygen 1.8.2