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 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,
32 TRANS_STATE_MAX = 6,
33 };
34
35 struct btrfs_transaction {
36 u64 transid;
37 /*
38 * total external writers(USERSPACE/START/ATTACH) in this
39 * transaction, it must be zero before the transaction is
40 * being committed
41 */
42 atomic_t num_extwriters;
43 /*
44 * total writers in this transaction, it must be zero before the
45 * transaction can end
46 */
47 atomic_t num_writers;
48 atomic_t use_count;
49
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 pending_chunks;
59 struct list_head pending_ordered;
60 struct list_head switch_commits;
61 struct btrfs_delayed_ref_root delayed_refs;
62 int aborted;
63 };
64
65 #define __TRANS_FREEZABLE (1U << 0)
66
67 #define __TRANS_USERSPACE (1U << 8)
68 #define __TRANS_START (1U << 9)
69 #define __TRANS_ATTACH (1U << 10)
70 #define __TRANS_JOIN (1U << 11)
71 #define __TRANS_JOIN_NOLOCK (1U << 12)
72 #define __TRANS_DUMMY (1U << 13)
73
74 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE)
75 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE)
76 #define TRANS_ATTACH (__TRANS_ATTACH)
77 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE)
78 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK)
79
80 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \
81 __TRANS_ATTACH)
82
83 #define BTRFS_SEND_TRANS_STUB ((void *)1)
84
85 struct btrfs_trans_handle {
86 u64 transid;
87 u64 bytes_reserved;
88 u64 qgroup_reserved;
89 unsigned long use_count;
90 unsigned long blocks_reserved;
91 unsigned long delayed_ref_updates;
92 struct btrfs_transaction *transaction;
93 struct btrfs_block_rsv *block_rsv;
94 struct btrfs_block_rsv *orig_rsv;
95 short aborted;
96 short adding_csums;
97 bool allocating_chunk;
98 bool reloc_reserved;
99 bool sync;
100 bool dirty;
101 unsigned int type;
102 /*
103 * this root is only needed to validate that the root passed to
104 * start_transaction is the same as the one passed to end_transaction.
105 * Subvolume quota depends on this
106 */
107 struct btrfs_root *root;
108 struct seq_list delayed_ref_elem;
109 struct list_head ordered;
110 struct list_head qgroup_ref_list;
111 struct list_head new_bgs;
112 };
113
114 struct btrfs_pending_snapshot {
115 struct dentry *dentry;
116 struct inode *dir;
117 struct btrfs_root *root;
118 struct btrfs_root *snap;
119 struct btrfs_qgroup_inherit *inherit;
120 /* block reservation for the operation */
121 struct btrfs_block_rsv block_rsv;
122 u64 qgroup_reserved;
123 /* extra metadata reseration for relocation */
124 int error;
125 bool readonly;
126 struct list_head list;
127 };
128
btrfs_set_inode_last_trans(struct btrfs_trans_handle * trans,struct inode * inode)129 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
130 struct inode *inode)
131 {
132 BTRFS_I(inode)->last_trans = trans->transaction->transid;
133 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
134 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
135 }
136
137 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
138 struct btrfs_root *root);
139 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
140 int num_items);
141 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
142 struct btrfs_root *root, int num_items);
143 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
144 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
145 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
146 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
147 struct btrfs_root *root);
148 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
149 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
150 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
151 struct btrfs_root *root);
152
153 void btrfs_add_dead_root(struct btrfs_root *root);
154 int btrfs_defrag_root(struct btrfs_root *root);
155 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
156 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
157 struct btrfs_root *root);
158 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
159 struct btrfs_root *root,
160 int wait_for_unblock);
161 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
162 struct btrfs_root *root);
163 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
164 struct btrfs_root *root);
165 void btrfs_throttle(struct btrfs_root *root);
166 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
167 struct btrfs_root *root);
168 int btrfs_write_marked_extents(struct btrfs_root *root,
169 struct extent_io_tree *dirty_pages, int mark);
170 int btrfs_wait_marked_extents(struct btrfs_root *root,
171 struct extent_io_tree *dirty_pages, int mark);
172 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
173 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
174 void btrfs_put_transaction(struct btrfs_transaction *transaction);
175 #endif
176