2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #ifndef __BTRFS_TRANSACTION__
20 #define __BTRFS_TRANSACTION__
21 #include "btrfs_inode.h"
22 #include "delayed-ref.h"
25 enum btrfs_trans_state {
26 TRANS_STATE_RUNNING = 0,
27 TRANS_STATE_BLOCKED = 1,
28 TRANS_STATE_COMMIT_START = 2,
29 TRANS_STATE_COMMIT_DOING = 3,
30 TRANS_STATE_UNBLOCKED = 4,
31 TRANS_STATE_COMPLETED = 5,
35 struct btrfs_transaction {
38 * total external writers(USERSPACE/START/ATTACH) in this
39 * transaction, it must be zero before the transaction is
42 atomic_t num_extwriters;
44 * total writers in this transaction, it must be zero before the
50 /* Be protected by fs_info->trans_lock when we want to change it. */
51 enum btrfs_trans_state state;
52 struct list_head list;
53 struct extent_io_tree dirty_pages;
54 unsigned long start_time;
55 wait_queue_head_t writer_wait;
56 wait_queue_head_t commit_wait;
57 struct list_head pending_snapshots;
58 struct list_head ordered_operations;
59 struct btrfs_delayed_ref_root delayed_refs;
63 #define __TRANS_FREEZABLE (1U << 0)
65 #define __TRANS_USERSPACE (1U << 8)
66 #define __TRANS_START (1U << 9)
67 #define __TRANS_ATTACH (1U << 10)
68 #define __TRANS_JOIN (1U << 11)
69 #define __TRANS_JOIN_NOLOCK (1U << 12)
71 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE)
72 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE)
73 #define TRANS_ATTACH (__TRANS_ATTACH)
74 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE)
75 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK)
77 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \
80 struct btrfs_trans_handle {
84 unsigned long use_count;
85 unsigned long blocks_reserved;
86 unsigned long blocks_used;
87 unsigned long delayed_ref_updates;
88 struct btrfs_transaction *transaction;
89 struct btrfs_block_rsv *block_rsv;
90 struct btrfs_block_rsv *orig_rsv;
93 bool allocating_chunk;
96 * this root is only needed to validate that the root passed to
97 * start_transaction is the same as the one passed to end_transaction.
98 * Subvolume quota depends on this
100 struct btrfs_root *root;
101 struct seq_list delayed_ref_elem;
102 struct list_head qgroup_ref_list;
103 struct list_head new_bgs;
106 struct btrfs_pending_snapshot {
107 struct dentry *dentry;
109 struct btrfs_root *root;
110 struct btrfs_root *snap;
111 struct btrfs_qgroup_inherit *inherit;
112 /* block reservation for the operation */
113 struct btrfs_block_rsv block_rsv;
115 /* extra metadata reseration for relocation */
118 struct list_head list;
121 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
124 BTRFS_I(inode)->last_trans = trans->transaction->transid;
125 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
126 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
129 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
130 struct btrfs_root *root);
131 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
133 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
134 struct btrfs_root *root, int num_items);
135 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
136 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
137 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
138 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
139 struct btrfs_root *root);
140 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
141 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
142 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
143 struct btrfs_root *root);
145 int btrfs_add_dead_root(struct btrfs_root *root);
146 int btrfs_defrag_root(struct btrfs_root *root);
147 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
148 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
149 struct btrfs_root *root);
150 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
151 struct btrfs_root *root,
152 int wait_for_unblock);
153 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
154 struct btrfs_root *root);
155 int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans,
156 struct btrfs_root *root);
157 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
158 struct btrfs_root *root);
159 void btrfs_throttle(struct btrfs_root *root);
160 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
161 struct btrfs_root *root);
162 int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
163 struct extent_io_tree *dirty_pages, int mark);
164 int btrfs_write_marked_extents(struct btrfs_root *root,
165 struct extent_io_tree *dirty_pages, int mark);
166 int btrfs_wait_marked_extents(struct btrfs_root *root,
167 struct extent_io_tree *dirty_pages, int mark);
168 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
169 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);