1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2
3 #ifndef BTRFS_BLOCK_RSV_H
4 #define BTRFS_BLOCK_RSV_H
5
6 #include <linux/types.h>
7 #include <linux/compiler.h>
8 #include <linux/spinlock.h>
9
10 struct btrfs_trans_handle;
11 struct btrfs_root;
12 struct btrfs_space_info;
13 struct btrfs_block_rsv;
14 struct btrfs_fs_info;
15 enum btrfs_reserve_flush_enum;
16
17 /*
18 * Types of block reserves
19 */
20 enum btrfs_rsv_type {
21 BTRFS_BLOCK_RSV_GLOBAL,
22 BTRFS_BLOCK_RSV_DELALLOC,
23 BTRFS_BLOCK_RSV_TRANS,
24 BTRFS_BLOCK_RSV_CHUNK,
25 BTRFS_BLOCK_RSV_DELOPS,
26 BTRFS_BLOCK_RSV_DELREFS,
27 BTRFS_BLOCK_RSV_EMPTY,
28 BTRFS_BLOCK_RSV_TEMP,
29 };
30
31 struct btrfs_block_rsv {
32 u64 size;
33 u64 reserved;
34 struct btrfs_space_info *space_info;
35 spinlock_t lock;
36 bool full;
37 bool failfast;
38 /* Block reserve type, one of BTRFS_BL
39 enum btrfs_rsv_type type:8;
40
41 /*
42 * Qgroup equivalent for @size @reserv
43 *
44 * Unlike normal @size/@reserved for i
45 * about things like csum size nor how
46 * reserve.
47 *
48 * Qgroup cares more about net change
49 *
50 * So for one newly inserted file exte
51 * leaf split and level increase, node
52 * already too much.
53 *
54 * In short, qgroup_size/reserved is t
55 * qgroup metadata reservation.
56 */
57 u64 qgroup_rsv_size;
58 u64 qgroup_rsv_reserved;
59 };
60
61 void btrfs_init_block_rsv(struct btrfs_block_r
62 void btrfs_init_root_block_rsv(struct btrfs_ro
63 struct btrfs_block_rsv *btrfs_alloc_block_rsv(
64
65 void btrfs_init_metadata_block_rsv(struct btrf
66 struct btrf
67 enum btrfs_
68 void btrfs_free_block_rsv(struct btrfs_fs_info
69 struct btrfs_block_r
70 int btrfs_block_rsv_add(struct btrfs_fs_info *
71 struct btrfs_block_rsv
72 enum btrfs_reserve_flu
73 int btrfs_block_rsv_check(struct btrfs_block_r
74 int btrfs_block_rsv_refill(struct btrfs_fs_inf
75 struct btrfs_block_
76 enum btrfs_reserve_
77 int btrfs_block_rsv_migrate(struct btrfs_block
78 struct btrfs_block
79 bool update_size);
80 int btrfs_block_rsv_use_bytes(struct btrfs_blo
81 void btrfs_block_rsv_add_bytes(struct btrfs_bl
82 u64 num_bytes,
83 u64 btrfs_block_rsv_release(struct btrfs_fs_in
84 struct btrfs_blo
85 u64 num_bytes, u
86 void btrfs_update_global_block_rsv(struct btrf
87 void btrfs_init_global_block_rsv(struct btrfs_
88 void btrfs_release_global_block_rsv(struct btr
89 struct btrfs_block_rsv *btrfs_use_block_rsv(st
90 st
91 u3
92 int btrfs_check_trunc_cache_free_space(const s
93 struct
94 static inline void btrfs_unuse_block_rsv(struc
95 struc
96 u32 b
97 {
98 btrfs_block_rsv_add_bytes(block_rsv, b
99 btrfs_block_rsv_release(fs_info, block
100 }
101
102 /*
103 * Fast path to check if the reserve is full,
104 * locks.
105 */
106 static inline bool btrfs_block_rsv_full(const
107 {
108 return data_race(rsv->full);
109 }
110
111 /*
112 * Get the reserved mount of a block reserve i
113 * value is acceptable, instead of accessing i
114 * warning from KCSAN.
115 */
116 static inline u64 btrfs_block_rsv_reserved(str
117 {
118 u64 ret;
119
120 spin_lock(&rsv->lock);
121 ret = rsv->reserved;
122 spin_unlock(&rsv->lock);
123
124 return ret;
125 }
126
127 /*
128 * Get the size of a block reserve in a contex
129 * acceptable, instead of accessing it directl
130 * from KCSAN.
131 */
132 static inline u64 btrfs_block_rsv_size(struct
133 {
134 u64 ret;
135
136 spin_lock(&rsv->lock);
137 ret = rsv->size;
138 spin_unlock(&rsv->lock);
139
140 return ret;
141 }
142
143 #endif /* BTRFS_BLOCK_RSV_H */
144
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