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
;
68 struct list_head dropped_roots
;
72 * we need to make sure block group deletion doesn't race with
73 * free space cache writeout. This mutex keeps them from stomping
76 struct mutex cache_write_mutex
;
77 spinlock_t dirty_bgs_lock
;
78 struct list_head deleted_bgs
;
79 spinlock_t deleted_bgs_lock
;
80 spinlock_t dropped_roots_lock
;
81 struct btrfs_delayed_ref_root delayed_refs
;
86 #define __TRANS_FREEZABLE (1U << 0)
88 #define __TRANS_USERSPACE (1U << 8)
89 #define __TRANS_START (1U << 9)
90 #define __TRANS_ATTACH (1U << 10)
91 #define __TRANS_JOIN (1U << 11)
92 #define __TRANS_JOIN_NOLOCK (1U << 12)
93 #define __TRANS_DUMMY (1U << 13)
95 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE)
96 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE)
97 #define TRANS_ATTACH (__TRANS_ATTACH)
98 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE)
99 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK)
101 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \
104 #define BTRFS_SEND_TRANS_STUB ((void *)1)
106 struct btrfs_trans_handle
{
109 u64 chunk_bytes_reserved
;
111 unsigned long use_count
;
112 unsigned long blocks_reserved
;
113 unsigned long blocks_used
;
114 unsigned long delayed_ref_updates
;
115 struct btrfs_transaction
*transaction
;
116 struct btrfs_block_rsv
*block_rsv
;
117 struct btrfs_block_rsv
*orig_rsv
;
120 bool allocating_chunk
;
121 bool can_flush_pending_bgs
;
126 * this root is only needed to validate that the root passed to
127 * start_transaction is the same as the one passed to end_transaction.
128 * Subvolume quota depends on this
130 struct btrfs_root
*root
;
131 struct seq_list delayed_ref_elem
;
132 struct list_head ordered
;
133 struct list_head qgroup_ref_list
;
134 struct list_head new_bgs
;
137 struct btrfs_pending_snapshot
{
138 struct dentry
*dentry
;
140 struct btrfs_root
*root
;
141 struct btrfs_root
*snap
;
142 struct btrfs_qgroup_inherit
*inherit
;
143 /* block reservation for the operation */
144 struct btrfs_block_rsv block_rsv
;
146 /* extra metadata reseration for relocation */
149 struct list_head list
;
152 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle
*trans
,
155 spin_lock(&BTRFS_I(inode
)->lock
);
156 BTRFS_I(inode
)->last_trans
= trans
->transaction
->transid
;
157 BTRFS_I(inode
)->last_sub_trans
= BTRFS_I(inode
)->root
->log_transid
;
158 BTRFS_I(inode
)->last_log_commit
= BTRFS_I(inode
)->root
->last_log_commit
;
159 spin_unlock(&BTRFS_I(inode
)->lock
);
163 * Make qgroup codes to skip given qgroupid, means the old/new_roots for
164 * qgroup won't contain the qgroupid in it.
166 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle
*trans
,
169 struct btrfs_delayed_ref_root
*delayed_refs
;
171 delayed_refs
= &trans
->transaction
->delayed_refs
;
172 WARN_ON(delayed_refs
->qgroup_to_skip
);
173 delayed_refs
->qgroup_to_skip
= qgroupid
;
176 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle
*trans
)
178 struct btrfs_delayed_ref_root
*delayed_refs
;
180 delayed_refs
= &trans
->transaction
->delayed_refs
;
181 WARN_ON(!delayed_refs
->qgroup_to_skip
);
182 delayed_refs
->qgroup_to_skip
= 0;
185 int btrfs_end_transaction(struct btrfs_trans_handle
*trans
,
186 struct btrfs_root
*root
);
187 struct btrfs_trans_handle
*btrfs_start_transaction(struct btrfs_root
*root
,
189 struct btrfs_trans_handle
*btrfs_start_transaction_lflush(
190 struct btrfs_root
*root
, int num_items
);
191 struct btrfs_trans_handle
*btrfs_join_transaction(struct btrfs_root
*root
);
192 struct btrfs_trans_handle
*btrfs_join_transaction_nolock(struct btrfs_root
*root
);
193 struct btrfs_trans_handle
*btrfs_attach_transaction(struct btrfs_root
*root
);
194 struct btrfs_trans_handle
*btrfs_attach_transaction_barrier(
195 struct btrfs_root
*root
);
196 struct btrfs_trans_handle
*btrfs_start_ioctl_transaction(struct btrfs_root
*root
);
197 int btrfs_wait_for_commit(struct btrfs_root
*root
, u64 transid
);
199 void btrfs_add_dead_root(struct btrfs_root
*root
);
200 int btrfs_defrag_root(struct btrfs_root
*root
);
201 int btrfs_clean_one_deleted_snapshot(struct btrfs_root
*root
);
202 int btrfs_commit_transaction(struct btrfs_trans_handle
*trans
,
203 struct btrfs_root
*root
);
204 int btrfs_commit_transaction_async(struct btrfs_trans_handle
*trans
,
205 struct btrfs_root
*root
,
206 int wait_for_unblock
);
207 int btrfs_end_transaction_throttle(struct btrfs_trans_handle
*trans
,
208 struct btrfs_root
*root
);
209 int btrfs_should_end_transaction(struct btrfs_trans_handle
*trans
,
210 struct btrfs_root
*root
);
211 void btrfs_throttle(struct btrfs_root
*root
);
212 int btrfs_record_root_in_trans(struct btrfs_trans_handle
*trans
,
213 struct btrfs_root
*root
);
214 int btrfs_write_marked_extents(struct btrfs_root
*root
,
215 struct extent_io_tree
*dirty_pages
, int mark
);
216 int btrfs_wait_marked_extents(struct btrfs_root
*root
,
217 struct extent_io_tree
*dirty_pages
, int mark
);
218 int btrfs_transaction_blocked(struct btrfs_fs_info
*info
);
219 int btrfs_transaction_in_commit(struct btrfs_fs_info
*info
);
220 void btrfs_put_transaction(struct btrfs_transaction
*transaction
);
221 void btrfs_apply_pending_changes(struct btrfs_fs_info
*fs_info
);
222 void btrfs_add_dropped_root(struct btrfs_trans_handle
*trans
,
223 struct btrfs_root
*root
);