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 #define BTRFS_TRANS_HAVE_FREE_BGS 0
36 #define BTRFS_TRANS_DIRTY_BG_RUN 1
37 #define BTRFS_TRANS_CACHE_ENOSPC 2
38
39 struct btrfs_transaction {
40 u64 transid;
41 /*
42 * total external writers(USERSPACE/START/ATTACH) in this
43 * transaction, it must be zero before the transaction is
44 * being committed
45 */
46 atomic_t num_extwriters;
47 /*
48 * total writers in this transaction, it must be zero before the
49 * transaction can end
50 */
51 atomic_t num_writers;
52 atomic_t use_count;
53 atomic_t pending_ordered;
54
55 unsigned long flags;
56
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;
71 u64 num_dirty_bgs;
72
73 /*
74 * we need to make sure block group deletion doesn't race with
75 * free space cache writeout. This mutex keeps them from stomping
76 * on each other
77 */
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;
84 int aborted;
85 struct btrfs_fs_info *fs_info;
86 };
87
88 #define __TRANS_FREEZABLE (1U << 0)
89
90 #define __TRANS_USERSPACE (1U << 8)
91 #define __TRANS_START (1U << 9)
92 #define __TRANS_ATTACH (1U << 10)
93 #define __TRANS_JOIN (1U << 11)
94 #define __TRANS_JOIN_NOLOCK (1U << 12)
95 #define __TRANS_DUMMY (1U << 13)
96
97 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE)
98 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE)
99 #define TRANS_ATTACH (__TRANS_ATTACH)
100 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE)
101 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK)
102
103 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \
104 __TRANS_ATTACH)
105
106 #define BTRFS_SEND_TRANS_STUB ((void *)1)
107
108 struct btrfs_trans_handle {
109 u64 transid;
110 u64 bytes_reserved;
111 u64 chunk_bytes_reserved;
112 unsigned long use_count;
113 unsigned long blocks_reserved;
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;
118 short aborted;
119 short adding_csums;
120 bool allocating_chunk;
121 bool can_flush_pending_bgs;
122 bool reloc_reserved;
123 bool sync;
124 bool dirty;
125 unsigned int type;
126 /*
127 * this root is only needed to validate that the root passed to
128 * start_transaction is the same as the one passed to end_transaction.
129 * Subvolume quota depends on this
130 */
131 struct btrfs_root *root;
132 struct btrfs_fs_info *fs_info;
133 struct seq_list delayed_ref_elem;
134 struct list_head qgroup_ref_list;
135 struct list_head new_bgs;
136 };
137
138 struct btrfs_pending_snapshot {
139 struct dentry *dentry;
140 struct inode *dir;
141 struct btrfs_root *root;
142 struct btrfs_root_item *root_item;
143 struct btrfs_root *snap;
144 struct btrfs_qgroup_inherit *inherit;
145 struct btrfs_path *path;
146 /* block reservation for the operation */
147 struct btrfs_block_rsv block_rsv;
148 u64 qgroup_reserved;
149 /* extra metadata reservation for relocation */
150 int error;
151 bool readonly;
152 struct list_head list;
153 };
154
btrfs_set_inode_last_trans(struct btrfs_trans_handle * trans,struct inode * inode)155 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
156 struct inode *inode)
157 {
158 spin_lock(&BTRFS_I(inode)->lock);
159 BTRFS_I(inode)->last_trans = trans->transaction->transid;
160 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
161 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
162 spin_unlock(&BTRFS_I(inode)->lock);
163 }
164
165 /*
166 * Make qgroup codes to skip given qgroupid, means the old/new_roots for
167 * qgroup won't contain the qgroupid in it.
168 */
btrfs_set_skip_qgroup(struct btrfs_trans_handle * trans,u64 qgroupid)169 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
170 u64 qgroupid)
171 {
172 struct btrfs_delayed_ref_root *delayed_refs;
173
174 delayed_refs = &trans->transaction->delayed_refs;
175 WARN_ON(delayed_refs->qgroup_to_skip);
176 delayed_refs->qgroup_to_skip = qgroupid;
177 }
178
btrfs_clear_skip_qgroup(struct btrfs_trans_handle * trans)179 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
180 {
181 struct btrfs_delayed_ref_root *delayed_refs;
182
183 delayed_refs = &trans->transaction->delayed_refs;
184 WARN_ON(!delayed_refs->qgroup_to_skip);
185 delayed_refs->qgroup_to_skip = 0;
186 }
187
188 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
189 struct btrfs_root *root);
190 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
191 unsigned int num_items);
192 struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
193 struct btrfs_root *root,
194 unsigned int num_items,
195 int min_factor);
196 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
197 struct btrfs_root *root,
198 unsigned int num_items);
199 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
200 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
201 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
202 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
203 struct btrfs_root *root);
204 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
205 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
206
207 void btrfs_add_dead_root(struct btrfs_root *root);
208 int btrfs_defrag_root(struct btrfs_root *root);
209 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
210 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
211 struct btrfs_root *root);
212 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
213 struct btrfs_root *root,
214 int wait_for_unblock);
215 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
216 struct btrfs_root *root);
217 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
218 struct btrfs_root *root);
219 void btrfs_throttle(struct btrfs_root *root);
220 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
221 struct btrfs_root *root);
222 int btrfs_write_marked_extents(struct btrfs_root *root,
223 struct extent_io_tree *dirty_pages, int mark);
224 int btrfs_wait_marked_extents(struct btrfs_root *root,
225 struct extent_io_tree *dirty_pages, int mark);
226 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
227 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
228 void btrfs_put_transaction(struct btrfs_transaction *transaction);
229 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
230 void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
231 struct btrfs_root *root);
232 #endif
233