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 };
86
87 #define __TRANS_FREEZABLE (1U << 0)
88
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)
95
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)
101
102 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \
103 __TRANS_ATTACH)
104
105 #define BTRFS_SEND_TRANS_STUB ((void *)1)
106
107 struct btrfs_trans_handle {
108 u64 transid;
109 u64 bytes_reserved;
110 u64 chunk_bytes_reserved;
111 unsigned long use_count;
112 unsigned long blocks_reserved;
113 unsigned long delayed_ref_updates;
114 struct btrfs_transaction *transaction;
115 struct btrfs_block_rsv *block_rsv;
116 struct btrfs_block_rsv *orig_rsv;
117 short aborted;
118 short adding_csums;
119 bool allocating_chunk;
120 bool can_flush_pending_bgs;
121 bool reloc_reserved;
122 bool sync;
123 bool dirty;
124 unsigned int type;
125 /*
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
129 */
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;
134 };
135
136 struct btrfs_pending_snapshot {
137 struct dentry *dentry;
138 struct inode *dir;
139 struct btrfs_root *root;
140 struct btrfs_root *snap;
141 struct btrfs_qgroup_inherit *inherit;
142 /* block reservation for the operation */
143 struct btrfs_block_rsv block_rsv;
144 u64 qgroup_reserved;
145 /* extra metadata reseration for relocation */
146 int error;
147 bool readonly;
148 struct list_head list;
149 };
150
btrfs_set_inode_last_trans(struct btrfs_trans_handle * trans,struct inode * inode)151 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
152 struct inode *inode)
153 {
154 spin_lock(&BTRFS_I(inode)->lock);
155 BTRFS_I(inode)->last_trans = trans->transaction->transid;
156 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
157 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
158 spin_unlock(&BTRFS_I(inode)->lock);
159 }
160
161 /*
162 * Make qgroup codes to skip given qgroupid, means the old/new_roots for
163 * qgroup won't contain the qgroupid in it.
164 */
btrfs_set_skip_qgroup(struct btrfs_trans_handle * trans,u64 qgroupid)165 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
166 u64 qgroupid)
167 {
168 struct btrfs_delayed_ref_root *delayed_refs;
169
170 delayed_refs = &trans->transaction->delayed_refs;
171 WARN_ON(delayed_refs->qgroup_to_skip);
172 delayed_refs->qgroup_to_skip = qgroupid;
173 }
174
btrfs_clear_skip_qgroup(struct btrfs_trans_handle * trans)175 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
176 {
177 struct btrfs_delayed_ref_root *delayed_refs;
178
179 delayed_refs = &trans->transaction->delayed_refs;
180 WARN_ON(!delayed_refs->qgroup_to_skip);
181 delayed_refs->qgroup_to_skip = 0;
182 }
183
184 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
185 struct btrfs_root *root);
186 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
187 unsigned int num_items);
188 struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
189 struct btrfs_root *root,
190 unsigned int num_items,
191 int min_factor);
192 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
193 struct btrfs_root *root,
194 unsigned int num_items);
195 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
196 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
197 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
198 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
199 struct btrfs_root *root);
200 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
201 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
202
203 void btrfs_add_dead_root(struct btrfs_root *root);
204 int btrfs_defrag_root(struct btrfs_root *root);
205 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
206 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
207 struct btrfs_root *root);
208 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
209 struct btrfs_root *root,
210 int wait_for_unblock);
211 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
212 struct btrfs_root *root);
213 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
214 struct btrfs_root *root);
215 void btrfs_throttle(struct btrfs_root *root);
216 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
217 struct btrfs_root *root);
218 int btrfs_write_marked_extents(struct btrfs_root *root,
219 struct extent_io_tree *dirty_pages, int mark);
220 int btrfs_wait_marked_extents(struct btrfs_root *root,
221 struct extent_io_tree *dirty_pages, int mark);
222 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
223 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
224 void btrfs_put_transaction(struct btrfs_transaction *transaction);
225 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
226 void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
227 struct btrfs_root *root);
228 #endif
229