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
51 * true if there is free bgs operations in this transaction
55 /* Be protected by fs_info->trans_lock when we want to change it. */
56 enum btrfs_trans_state state;
57 struct list_head list;
58 struct extent_io_tree dirty_pages;
59 unsigned long start_time;
60 wait_queue_head_t writer_wait;
61 wait_queue_head_t commit_wait;
62 struct list_head pending_snapshots;
63 struct list_head pending_chunks;
64 struct list_head pending_ordered;
65 struct list_head switch_commits;
66 struct list_head dirty_bgs;
67 struct list_head io_bgs;
71 * we need to make sure block group deletion doesn't race with
72 * free space cache writeout. This mutex keeps them from stomping
75 struct mutex cache_write_mutex;
76 spinlock_t dirty_bgs_lock;
77 struct btrfs_delayed_ref_root delayed_refs;
82 #define __TRANS_FREEZABLE (1U << 0)
84 #define __TRANS_USERSPACE (1U << 8)
85 #define __TRANS_START (1U << 9)
86 #define __TRANS_ATTACH (1U << 10)
87 #define __TRANS_JOIN (1U << 11)
88 #define __TRANS_JOIN_NOLOCK (1U << 12)
89 #define __TRANS_DUMMY (1U << 13)
91 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE)
92 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE)
93 #define TRANS_ATTACH (__TRANS_ATTACH)
94 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE)
95 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK)
97 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \
100 #define BTRFS_SEND_TRANS_STUB ((void *)1)
102 struct btrfs_trans_handle {
105 u64 chunk_bytes_reserved;
107 unsigned long use_count;
108 unsigned long blocks_reserved;
109 unsigned long blocks_used;
110 unsigned long delayed_ref_updates;
111 struct btrfs_transaction *transaction;
112 struct btrfs_block_rsv *block_rsv;
113 struct btrfs_block_rsv *orig_rsv;
116 bool allocating_chunk;
121 * this root is only needed to validate that the root passed to
122 * start_transaction is the same as the one passed to end_transaction.
123 * Subvolume quota depends on this
125 struct btrfs_root *root;
126 struct seq_list delayed_ref_elem;
127 struct list_head ordered;
128 struct list_head qgroup_ref_list;
129 struct list_head new_bgs;
132 struct btrfs_pending_snapshot {
133 struct dentry *dentry;
135 struct btrfs_root *root;
136 struct btrfs_root *snap;
137 struct btrfs_qgroup_inherit *inherit;
138 /* block reservation for the operation */
139 struct btrfs_block_rsv block_rsv;
141 /* extra metadata reseration for relocation */
144 struct list_head list;
147 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
150 spin_lock(&BTRFS_I(inode)->lock);
151 BTRFS_I(inode)->last_trans = trans->transaction->transid;
152 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
153 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
154 spin_unlock(&BTRFS_I(inode)->lock);
157 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
158 struct btrfs_root *root);
159 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
161 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
162 struct btrfs_root *root, int num_items);
163 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
164 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
165 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
166 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
167 struct btrfs_root *root);
168 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
169 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
171 void btrfs_add_dead_root(struct btrfs_root *root);
172 int btrfs_defrag_root(struct btrfs_root *root);
173 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
174 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
175 struct btrfs_root *root);
176 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
177 struct btrfs_root *root,
178 int wait_for_unblock);
179 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
180 struct btrfs_root *root);
181 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
182 struct btrfs_root *root);
183 void btrfs_throttle(struct btrfs_root *root);
184 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
185 struct btrfs_root *root);
186 int btrfs_write_marked_extents(struct btrfs_root *root,
187 struct extent_io_tree *dirty_pages, int mark);
188 int btrfs_wait_marked_extents(struct btrfs_root *root,
189 struct extent_io_tree *dirty_pages, int mark);
190 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
191 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
192 void btrfs_put_transaction(struct btrfs_transaction *transaction);
193 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);