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9888c340 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
6cbd5570 CM |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
6cbd5570 CM |
4 | */ |
5 | ||
9888c340 DS |
6 | #ifndef BTRFS_TRANSACTION_H |
7 | #define BTRFS_TRANSACTION_H | |
9b64f57d ER |
8 | |
9 | #include <linux/refcount.h> | |
31f3c99b | 10 | #include "btrfs_inode.h" |
56bec294 | 11 | #include "delayed-ref.h" |
bed92eae | 12 | #include "ctree.h" |
e089f05c | 13 | |
4a9d8bde MX |
14 | enum btrfs_trans_state { |
15 | TRANS_STATE_RUNNING = 0, | |
16 | TRANS_STATE_BLOCKED = 1, | |
17 | TRANS_STATE_COMMIT_START = 2, | |
18 | TRANS_STATE_COMMIT_DOING = 3, | |
19 | TRANS_STATE_UNBLOCKED = 4, | |
20 | TRANS_STATE_COMPLETED = 5, | |
21 | TRANS_STATE_MAX = 6, | |
22 | }; | |
23 | ||
3204d33c JB |
24 | #define BTRFS_TRANS_HAVE_FREE_BGS 0 |
25 | #define BTRFS_TRANS_DIRTY_BG_RUN 1 | |
2968b1f4 | 26 | #define BTRFS_TRANS_CACHE_ENOSPC 2 |
3204d33c | 27 | |
79154b1b CM |
28 | struct btrfs_transaction { |
29 | u64 transid; | |
0860adfd MX |
30 | /* |
31 | * total external writers(USERSPACE/START/ATTACH) in this | |
32 | * transaction, it must be zero before the transaction is | |
33 | * being committed | |
34 | */ | |
35 | atomic_t num_extwriters; | |
b7ec40d7 CM |
36 | /* |
37 | * total writers in this transaction, it must be zero before the | |
38 | * transaction can end | |
39 | */ | |
13c5a93e | 40 | atomic_t num_writers; |
9b64f57d | 41 | refcount_t use_count; |
161c3549 | 42 | atomic_t pending_ordered; |
b7ec40d7 | 43 | |
3204d33c | 44 | unsigned long flags; |
13212b54 | 45 | |
4a9d8bde MX |
46 | /* Be protected by fs_info->trans_lock when we want to change it. */ |
47 | enum btrfs_trans_state state; | |
5302e089 | 48 | int aborted; |
8fd17795 | 49 | struct list_head list; |
d1310b2e | 50 | struct extent_io_tree dirty_pages; |
08607c1b | 51 | unsigned long start_time; |
79154b1b CM |
52 | wait_queue_head_t writer_wait; |
53 | wait_queue_head_t commit_wait; | |
161c3549 | 54 | wait_queue_head_t pending_wait; |
3063d29f | 55 | struct list_head pending_snapshots; |
6df9a95e | 56 | struct list_head pending_chunks; |
9e351cc8 | 57 | struct list_head switch_commits; |
ce93ec54 | 58 | struct list_head dirty_bgs; |
45ae2c18 NB |
59 | |
60 | /* | |
61 | * There is no explicit lock which protects io_bgs, rather its | |
62 | * consistency is implied by the fact that all the sites which modify | |
63 | * it do so under some form of transaction critical section, namely: | |
64 | * | |
65 | * - btrfs_start_dirty_block_groups - This function can only ever be | |
66 | * run by one of the transaction committers. Refer to | |
67 | * BTRFS_TRANS_DIRTY_BG_RUN usage in btrfs_commit_transaction | |
68 | * | |
69 | * - btrfs_write_dirty_blockgroups - this is called by | |
70 | * commit_cowonly_roots from transaction critical section | |
71 | * (TRANS_STATE_COMMIT_DOING) | |
72 | * | |
73 | * - btrfs_cleanup_dirty_bgs - called on transaction abort | |
74 | */ | |
1bbc621e | 75 | struct list_head io_bgs; |
2b9dbef2 | 76 | struct list_head dropped_roots; |
1bbc621e CM |
77 | |
78 | /* | |
79 | * we need to make sure block group deletion doesn't race with | |
80 | * free space cache writeout. This mutex keeps them from stomping | |
81 | * on each other | |
82 | */ | |
83 | struct mutex cache_write_mutex; | |
ce93ec54 | 84 | spinlock_t dirty_bgs_lock; |
5302e089 | 85 | unsigned int num_dirty_bgs; |
348a0013 | 86 | /* Protected by spin lock fs_info->unused_bgs_lock. */ |
e33e17ee | 87 | struct list_head deleted_bgs; |
2b9dbef2 | 88 | spinlock_t dropped_roots_lock; |
56bec294 | 89 | struct btrfs_delayed_ref_root delayed_refs; |
ab8d0fc4 | 90 | struct btrfs_fs_info *fs_info; |
79154b1b CM |
91 | }; |
92 | ||
0860adfd MX |
93 | #define __TRANS_FREEZABLE (1U << 0) |
94 | ||
0860adfd MX |
95 | #define __TRANS_START (1U << 9) |
96 | #define __TRANS_ATTACH (1U << 10) | |
97 | #define __TRANS_JOIN (1U << 11) | |
98 | #define __TRANS_JOIN_NOLOCK (1U << 12) | |
faa2dbf0 | 99 | #define __TRANS_DUMMY (1U << 13) |
0860adfd | 100 | |
0860adfd MX |
101 | #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE) |
102 | #define TRANS_ATTACH (__TRANS_ATTACH) | |
103 | #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE) | |
104 | #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK) | |
105 | ||
bcf3a3e7 | 106 | #define TRANS_EXTWRITERS (__TRANS_START | __TRANS_ATTACH) |
a698d075 | 107 | |
2755a0de | 108 | #define BTRFS_SEND_TRANS_STUB ((void *)1) |
a26e8c9f | 109 | |
e089f05c CM |
110 | struct btrfs_trans_handle { |
111 | u64 transid; | |
f0486c68 | 112 | u64 bytes_reserved; |
4fbcdf66 | 113 | u64 chunk_bytes_reserved; |
56bec294 | 114 | unsigned long delayed_ref_updates; |
f0486c68 YZ |
115 | struct btrfs_transaction *transaction; |
116 | struct btrfs_block_rsv *block_rsv; | |
2a1eb461 | 117 | struct btrfs_block_rsv *orig_rsv; |
1ca4bb63 DS |
118 | refcount_t use_count; |
119 | unsigned int type; | |
a698d075 | 120 | short aborted; |
7c2871a2 | 121 | bool adding_csums; |
c6b305a8 | 122 | bool allocating_chunk; |
d9a0540a | 123 | bool can_flush_pending_bgs; |
20dd2cbf | 124 | bool reloc_reserved; |
5039eddc | 125 | bool sync; |
64c12921 | 126 | bool dirty; |
d13603ef | 127 | struct btrfs_root *root; |
64b63580 | 128 | struct btrfs_fs_info *fs_info; |
ea658bad | 129 | struct list_head new_bgs; |
e089f05c CM |
130 | }; |
131 | ||
3063d29f | 132 | struct btrfs_pending_snapshot { |
3de4586c | 133 | struct dentry *dentry; |
e9662f70 | 134 | struct inode *dir; |
3063d29f | 135 | struct btrfs_root *root; |
b0c0ea63 | 136 | struct btrfs_root_item *root_item; |
a22285a6 | 137 | struct btrfs_root *snap; |
6f72c7e2 | 138 | struct btrfs_qgroup_inherit *inherit; |
8546b570 | 139 | struct btrfs_path *path; |
a22285a6 YZ |
140 | /* block reservation for the operation */ |
141 | struct btrfs_block_rsv block_rsv; | |
01327610 | 142 | /* extra metadata reservation for relocation */ |
a22285a6 | 143 | int error; |
b83cc969 | 144 | bool readonly; |
3063d29f CM |
145 | struct list_head list; |
146 | }; | |
147 | ||
15ee9bc7 JB |
148 | static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, |
149 | struct inode *inode) | |
150 | { | |
2f2ff0ee | 151 | spin_lock(&BTRFS_I(inode)->lock); |
15ee9bc7 | 152 | BTRFS_I(inode)->last_trans = trans->transaction->transid; |
257c62e1 | 153 | BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; |
46d8bc34 | 154 | BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; |
2f2ff0ee | 155 | spin_unlock(&BTRFS_I(inode)->lock); |
15ee9bc7 JB |
156 | } |
157 | ||
9086db86 QW |
158 | /* |
159 | * Make qgroup codes to skip given qgroupid, means the old/new_roots for | |
160 | * qgroup won't contain the qgroupid in it. | |
161 | */ | |
162 | static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans, | |
163 | u64 qgroupid) | |
164 | { | |
165 | struct btrfs_delayed_ref_root *delayed_refs; | |
166 | ||
167 | delayed_refs = &trans->transaction->delayed_refs; | |
168 | WARN_ON(delayed_refs->qgroup_to_skip); | |
169 | delayed_refs->qgroup_to_skip = qgroupid; | |
170 | } | |
171 | ||
172 | static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans) | |
173 | { | |
174 | struct btrfs_delayed_ref_root *delayed_refs; | |
175 | ||
176 | delayed_refs = &trans->transaction->delayed_refs; | |
177 | WARN_ON(!delayed_refs->qgroup_to_skip); | |
178 | delayed_refs->qgroup_to_skip = 0; | |
179 | } | |
180 | ||
3a45bb20 | 181 | int btrfs_end_transaction(struct btrfs_trans_handle *trans); |
79154b1b | 182 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
5aed1dd8 | 183 | unsigned int num_items); |
8eab77ff FM |
184 | struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv( |
185 | struct btrfs_root *root, | |
186 | unsigned int num_items, | |
187 | int min_factor); | |
7a7eaa40 JB |
188 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); |
189 | struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root); | |
354aa0fb | 190 | struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root); |
d4edf39b MX |
191 | struct btrfs_trans_handle *btrfs_attach_transaction_barrier( |
192 | struct btrfs_root *root); | |
2ff7e61e | 193 | int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid); |
08607c1b | 194 | |
cfad392b | 195 | void btrfs_add_dead_root(struct btrfs_root *root); |
de78b51a | 196 | int btrfs_defrag_root(struct btrfs_root *root); |
9d1a2a3a | 197 | int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root); |
3a45bb20 | 198 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans); |
bb9c12c9 | 199 | int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, |
bb9c12c9 | 200 | int wait_for_unblock); |
a514d638 QW |
201 | |
202 | /* | |
203 | * Try to commit transaction asynchronously, so this is safe to call | |
204 | * even holding a spinlock. | |
205 | * | |
206 | * It's done by informing transaction_kthread to commit transaction without | |
207 | * waiting for commit interval. | |
208 | */ | |
209 | static inline void btrfs_commit_transaction_locksafe( | |
210 | struct btrfs_fs_info *fs_info) | |
211 | { | |
212 | set_bit(BTRFS_FS_NEED_ASYNC_COMMIT, &fs_info->flags); | |
213 | wake_up_process(fs_info->transaction_kthread); | |
214 | } | |
3a45bb20 JM |
215 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans); |
216 | int btrfs_should_end_transaction(struct btrfs_trans_handle *trans); | |
2ff7e61e | 217 | void btrfs_throttle(struct btrfs_fs_info *fs_info); |
5d4f98a2 YZ |
218 | int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, |
219 | struct btrfs_root *root); | |
2ff7e61e | 220 | int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info, |
8cef4e16 | 221 | struct extent_io_tree *dirty_pages, int mark); |
bf89d38f JM |
222 | int btrfs_wait_extents(struct btrfs_fs_info *fs_info, |
223 | struct extent_io_tree *dirty_pages); | |
224 | int btrfs_wait_tree_log_extents(struct btrfs_root *root, int mark); | |
8929ecfa | 225 | int btrfs_transaction_blocked(struct btrfs_fs_info *info); |
f36f3042 | 226 | int btrfs_transaction_in_commit(struct btrfs_fs_info *info); |
724e2315 | 227 | void btrfs_put_transaction(struct btrfs_transaction *transaction); |
572d9ab7 | 228 | void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info); |
2b9dbef2 JB |
229 | void btrfs_add_dropped_root(struct btrfs_trans_handle *trans, |
230 | struct btrfs_root *root); | |
9888c340 | 231 | |
e089f05c | 232 | #endif |