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 #define BTRFS_TRANS_HAVE_FREE_BGS 0
36 #define BTRFS_TRANS_DIRTY_BG_RUN 1
37 #define BTRFS_TRANS_CACHE_ENOSPC 2
39 struct btrfs_transaction {
42 * total external writers(USERSPACE/START/ATTACH) in this
43 * transaction, it must be zero before the transaction is
46 atomic_t num_extwriters;
48 * total writers in this transaction, it must be zero before the
53 atomic_t pending_ordered;
57 /* Be protected by fs_info->trans_lock when we want to change it. */
58 enum btrfs_trans_state state;
59 struct list_head list;
60 struct extent_io_tree dirty_pages;
61 unsigned long start_time;
62 wait_queue_head_t writer_wait;
63 wait_queue_head_t commit_wait;
64 wait_queue_head_t pending_wait;
65 struct list_head pending_snapshots;
66 struct list_head pending_chunks;
67 struct list_head switch_commits;
68 struct list_head dirty_bgs;
69 struct list_head io_bgs;
70 struct list_head dropped_roots;
74 * we need to make sure block group deletion doesn't race with
75 * free space cache writeout. This mutex keeps them from stomping
78 struct mutex cache_write_mutex;
79 spinlock_t dirty_bgs_lock;
80 /* Protected by spin lock fs_info->unused_bgs_lock. */
81 struct list_head deleted_bgs;
82 spinlock_t dropped_roots_lock;
83 struct btrfs_delayed_ref_root delayed_refs;
87 #define __TRANS_FREEZABLE (1U << 0)
89 #define __TRANS_USERSPACE (1U << 8)
90 #define __TRANS_START (1U << 9)
91 #define __TRANS_ATTACH (1U << 10)
92 #define __TRANS_JOIN (1U << 11)
93 #define __TRANS_JOIN_NOLOCK (1U << 12)
94 #define __TRANS_DUMMY (1U << 13)
96 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE)
97 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE)
98 #define TRANS_ATTACH (__TRANS_ATTACH)
99 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE)
100 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK)
102 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \
105 #define BTRFS_SEND_TRANS_STUB ((void *)1)
107 struct btrfs_trans_handle {
110 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 qgroup_ref_list;
133 struct list_head new_bgs;
136 struct btrfs_pending_snapshot {
137 struct dentry *dentry;
139 struct btrfs_root *root;
140 struct btrfs_root_item *root_item;
141 struct btrfs_root *snap;
142 struct btrfs_qgroup_inherit *inherit;
143 struct btrfs_path *path;
144 /* block reservation for the operation */
145 struct btrfs_block_rsv block_rsv;
147 /* extra metadata reservation for relocation */
150 struct list_head list;
153 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
156 spin_lock(&BTRFS_I(inode)->lock);
157 BTRFS_I(inode)->last_trans = trans->transaction->transid;
158 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
159 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
160 spin_unlock(&BTRFS_I(inode)->lock);
164 * Make qgroup codes to skip given qgroupid, means the old/new_roots for
165 * qgroup won't contain the qgroupid in it.
167 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
170 struct btrfs_delayed_ref_root *delayed_refs;
172 delayed_refs = &trans->transaction->delayed_refs;
173 WARN_ON(delayed_refs->qgroup_to_skip);
174 delayed_refs->qgroup_to_skip = qgroupid;
177 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
179 struct btrfs_delayed_ref_root *delayed_refs;
181 delayed_refs = &trans->transaction->delayed_refs;
182 WARN_ON(!delayed_refs->qgroup_to_skip);
183 delayed_refs->qgroup_to_skip = 0;
186 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
187 struct btrfs_root *root);
188 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
189 unsigned int num_items);
190 struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
191 struct btrfs_root *root,
192 unsigned int num_items,
194 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
195 struct btrfs_root *root,
196 unsigned int num_items);
197 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
198 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
199 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
200 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
201 struct btrfs_root *root);
202 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
203 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
205 void btrfs_add_dead_root(struct btrfs_root *root);
206 int btrfs_defrag_root(struct btrfs_root *root);
207 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
208 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
209 struct btrfs_root *root);
210 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
211 struct btrfs_root *root,
212 int wait_for_unblock);
213 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
214 struct btrfs_root *root);
215 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
216 struct btrfs_root *root);
217 void btrfs_throttle(struct btrfs_root *root);
218 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
219 struct btrfs_root *root);
220 int btrfs_write_marked_extents(struct btrfs_root *root,
221 struct extent_io_tree *dirty_pages, int mark);
222 int btrfs_wait_marked_extents(struct btrfs_root *root,
223 struct extent_io_tree *dirty_pages, int mark);
224 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
225 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
226 void btrfs_put_transaction(struct btrfs_transaction *transaction);
227 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
228 void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
229 struct btrfs_root *root);