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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 | 14 | enum btrfs_trans_state { |
bbe339cc | 15 | TRANS_STATE_RUNNING, |
bbe339cc DS |
16 | TRANS_STATE_COMMIT_START, |
17 | TRANS_STATE_COMMIT_DOING, | |
18 | TRANS_STATE_UNBLOCKED, | |
d0c2f4fa | 19 | TRANS_STATE_SUPER_COMMITTED, |
bbe339cc DS |
20 | TRANS_STATE_COMPLETED, |
21 | TRANS_STATE_MAX, | |
4a9d8bde MX |
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; |
b7ec40d7 | 42 | |
3204d33c | 43 | unsigned long flags; |
13212b54 | 44 | |
4a9d8bde MX |
45 | /* Be protected by fs_info->trans_lock when we want to change it. */ |
46 | enum btrfs_trans_state state; | |
5302e089 | 47 | int aborted; |
8fd17795 | 48 | struct list_head list; |
d1310b2e | 49 | struct extent_io_tree dirty_pages; |
a944442c | 50 | time64_t start_time; |
79154b1b CM |
51 | wait_queue_head_t writer_wait; |
52 | wait_queue_head_t commit_wait; | |
3063d29f | 53 | struct list_head pending_snapshots; |
bbbf7243 | 54 | struct list_head dev_update_list; |
9e351cc8 | 55 | struct list_head switch_commits; |
ce93ec54 | 56 | struct list_head dirty_bgs; |
45ae2c18 NB |
57 | |
58 | /* | |
59 | * There is no explicit lock which protects io_bgs, rather its | |
60 | * consistency is implied by the fact that all the sites which modify | |
61 | * it do so under some form of transaction critical section, namely: | |
62 | * | |
63 | * - btrfs_start_dirty_block_groups - This function can only ever be | |
64 | * run by one of the transaction committers. Refer to | |
65 | * BTRFS_TRANS_DIRTY_BG_RUN usage in btrfs_commit_transaction | |
66 | * | |
67 | * - btrfs_write_dirty_blockgroups - this is called by | |
68 | * commit_cowonly_roots from transaction critical section | |
69 | * (TRANS_STATE_COMMIT_DOING) | |
70 | * | |
71 | * - btrfs_cleanup_dirty_bgs - called on transaction abort | |
72 | */ | |
1bbc621e | 73 | struct list_head io_bgs; |
2b9dbef2 | 74 | struct list_head dropped_roots; |
fe119a6e | 75 | struct extent_io_tree pinned_extents; |
1bbc621e CM |
76 | |
77 | /* | |
78 | * we need to make sure block group deletion doesn't race with | |
79 | * free space cache writeout. This mutex keeps them from stomping | |
80 | * on each other | |
81 | */ | |
82 | struct mutex cache_write_mutex; | |
ce93ec54 | 83 | spinlock_t dirty_bgs_lock; |
348a0013 | 84 | /* Protected by spin lock fs_info->unused_bgs_lock. */ |
e33e17ee | 85 | struct list_head deleted_bgs; |
2b9dbef2 | 86 | spinlock_t dropped_roots_lock; |
56bec294 | 87 | struct btrfs_delayed_ref_root delayed_refs; |
ab8d0fc4 | 88 | struct btrfs_fs_info *fs_info; |
48778179 FM |
89 | |
90 | /* | |
91 | * Number of ordered extents the transaction must wait for before | |
92 | * committing. These are ordered extents started by a fast fsync. | |
93 | */ | |
94 | atomic_t pending_ordered; | |
95 | wait_queue_head_t pending_wait; | |
d3575156 NA |
96 | |
97 | spinlock_t releasing_ebs_lock; | |
98 | struct list_head releasing_ebs; | |
eafa4fd0 FM |
99 | |
100 | /* | |
101 | * The number of bytes currently reserved, by all transaction handles | |
102 | * attached to this transaction, for metadata extents of the chunk tree. | |
103 | */ | |
104 | atomic64_t chunk_bytes_reserved; | |
105 | wait_queue_head_t chunk_reserve_wait; | |
79154b1b CM |
106 | }; |
107 | ||
0860adfd MX |
108 | #define __TRANS_FREEZABLE (1U << 0) |
109 | ||
0860adfd MX |
110 | #define __TRANS_START (1U << 9) |
111 | #define __TRANS_ATTACH (1U << 10) | |
112 | #define __TRANS_JOIN (1U << 11) | |
113 | #define __TRANS_JOIN_NOLOCK (1U << 12) | |
faa2dbf0 | 114 | #define __TRANS_DUMMY (1U << 13) |
a6d155d2 | 115 | #define __TRANS_JOIN_NOSTART (1U << 14) |
0860adfd | 116 | |
0860adfd MX |
117 | #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE) |
118 | #define TRANS_ATTACH (__TRANS_ATTACH) | |
119 | #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE) | |
120 | #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK) | |
a6d155d2 | 121 | #define TRANS_JOIN_NOSTART (__TRANS_JOIN_NOSTART) |
0860adfd | 122 | |
bcf3a3e7 | 123 | #define TRANS_EXTWRITERS (__TRANS_START | __TRANS_ATTACH) |
a698d075 | 124 | |
2755a0de | 125 | #define BTRFS_SEND_TRANS_STUB ((void *)1) |
a26e8c9f | 126 | |
e089f05c CM |
127 | struct btrfs_trans_handle { |
128 | u64 transid; | |
f0486c68 | 129 | u64 bytes_reserved; |
4fbcdf66 | 130 | u64 chunk_bytes_reserved; |
56bec294 | 131 | unsigned long delayed_ref_updates; |
f0486c68 YZ |
132 | struct btrfs_transaction *transaction; |
133 | struct btrfs_block_rsv *block_rsv; | |
2a1eb461 | 134 | struct btrfs_block_rsv *orig_rsv; |
1ca4bb63 DS |
135 | refcount_t use_count; |
136 | unsigned int type; | |
bf31f87f DS |
137 | /* |
138 | * Error code of transaction abort, set outside of locks and must use | |
139 | * the READ_ONCE/WRITE_ONCE access | |
140 | */ | |
a698d075 | 141 | short aborted; |
7c2871a2 | 142 | bool adding_csums; |
c6b305a8 | 143 | bool allocating_chunk; |
d9a0540a | 144 | bool can_flush_pending_bgs; |
20dd2cbf | 145 | bool reloc_reserved; |
64c12921 | 146 | bool dirty; |
d0c2f4fa | 147 | bool in_fsync; |
d13603ef | 148 | struct btrfs_root *root; |
64b63580 | 149 | struct btrfs_fs_info *fs_info; |
ea658bad | 150 | struct list_head new_bgs; |
e089f05c CM |
151 | }; |
152 | ||
bf31f87f DS |
153 | /* |
154 | * The abort status can be changed between calls and is not protected by locks. | |
155 | * This accepts btrfs_transaction and btrfs_trans_handle as types. Once it's | |
156 | * set to a non-zero value it does not change, so the macro should be in checks | |
157 | * but is not necessary for further reads of the value. | |
158 | */ | |
159 | #define TRANS_ABORTED(trans) (unlikely(READ_ONCE((trans)->aborted))) | |
160 | ||
3063d29f | 161 | struct btrfs_pending_snapshot { |
3de4586c | 162 | struct dentry *dentry; |
e9662f70 | 163 | struct inode *dir; |
3063d29f | 164 | struct btrfs_root *root; |
b0c0ea63 | 165 | struct btrfs_root_item *root_item; |
a22285a6 | 166 | struct btrfs_root *snap; |
6f72c7e2 | 167 | struct btrfs_qgroup_inherit *inherit; |
8546b570 | 168 | struct btrfs_path *path; |
a22285a6 YZ |
169 | /* block reservation for the operation */ |
170 | struct btrfs_block_rsv block_rsv; | |
01327610 | 171 | /* extra metadata reservation for relocation */ |
a22285a6 | 172 | int error; |
2dfb1e43 QW |
173 | /* Preallocated anonymous block device number */ |
174 | dev_t anon_dev; | |
b83cc969 | 175 | bool readonly; |
3063d29f CM |
176 | struct list_head list; |
177 | }; | |
178 | ||
15ee9bc7 | 179 | static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, |
d9094414 | 180 | struct btrfs_inode *inode) |
15ee9bc7 | 181 | { |
d9094414 NB |
182 | spin_lock(&inode->lock); |
183 | inode->last_trans = trans->transaction->transid; | |
184 | inode->last_sub_trans = inode->root->log_transid; | |
bc0939fc | 185 | inode->last_log_commit = inode->last_sub_trans - 1; |
d9094414 | 186 | spin_unlock(&inode->lock); |
15ee9bc7 JB |
187 | } |
188 | ||
9086db86 QW |
189 | /* |
190 | * Make qgroup codes to skip given qgroupid, means the old/new_roots for | |
191 | * qgroup won't contain the qgroupid in it. | |
192 | */ | |
193 | static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans, | |
194 | u64 qgroupid) | |
195 | { | |
196 | struct btrfs_delayed_ref_root *delayed_refs; | |
197 | ||
198 | delayed_refs = &trans->transaction->delayed_refs; | |
199 | WARN_ON(delayed_refs->qgroup_to_skip); | |
200 | delayed_refs->qgroup_to_skip = qgroupid; | |
201 | } | |
202 | ||
203 | static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans) | |
204 | { | |
205 | struct btrfs_delayed_ref_root *delayed_refs; | |
206 | ||
207 | delayed_refs = &trans->transaction->delayed_refs; | |
208 | WARN_ON(!delayed_refs->qgroup_to_skip); | |
209 | delayed_refs->qgroup_to_skip = 0; | |
210 | } | |
211 | ||
3a45bb20 | 212 | int btrfs_end_transaction(struct btrfs_trans_handle *trans); |
79154b1b | 213 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
5aed1dd8 | 214 | unsigned int num_items); |
8eab77ff FM |
215 | struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv( |
216 | struct btrfs_root *root, | |
7f9fe614 | 217 | unsigned int num_items); |
7a7eaa40 | 218 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); |
8d510121 | 219 | struct btrfs_trans_handle *btrfs_join_transaction_spacecache(struct btrfs_root *root); |
a6d155d2 | 220 | struct btrfs_trans_handle *btrfs_join_transaction_nostart(struct btrfs_root *root); |
354aa0fb | 221 | struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root); |
d4edf39b MX |
222 | struct btrfs_trans_handle *btrfs_attach_transaction_barrier( |
223 | struct btrfs_root *root); | |
2ff7e61e | 224 | int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid); |
08607c1b | 225 | |
cfad392b | 226 | void btrfs_add_dead_root(struct btrfs_root *root); |
de78b51a | 227 | int btrfs_defrag_root(struct btrfs_root *root); |
9d1a2a3a | 228 | int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root); |
3a45bb20 | 229 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans); |
bb9c12c9 | 230 | int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, |
bb9c12c9 | 231 | int wait_for_unblock); |
3a45bb20 | 232 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans); |
a2633b6a | 233 | bool btrfs_should_end_transaction(struct btrfs_trans_handle *trans); |
2ff7e61e | 234 | void btrfs_throttle(struct btrfs_fs_info *fs_info); |
5d4f98a2 YZ |
235 | int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, |
236 | struct btrfs_root *root); | |
2ff7e61e | 237 | int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info, |
8cef4e16 | 238 | struct extent_io_tree *dirty_pages, int mark); |
bf89d38f | 239 | int btrfs_wait_tree_log_extents(struct btrfs_root *root, int mark); |
8929ecfa | 240 | int btrfs_transaction_blocked(struct btrfs_fs_info *info); |
f36f3042 | 241 | int btrfs_transaction_in_commit(struct btrfs_fs_info *info); |
724e2315 | 242 | void btrfs_put_transaction(struct btrfs_transaction *transaction); |
572d9ab7 | 243 | void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info); |
2b9dbef2 JB |
244 | void btrfs_add_dropped_root(struct btrfs_trans_handle *trans, |
245 | struct btrfs_root *root); | |
fb6dea26 | 246 | void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans); |
9888c340 | 247 | |
e089f05c | 248 | #endif |