1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 2
3 #ifndef BTRFS_BLOCK_RSV_H 3 #ifndef BTRFS_BLOCK_RSV_H
4 #define BTRFS_BLOCK_RSV_H 4 #define BTRFS_BLOCK_RSV_H
5 5
6 #include <linux/types.h> 6 #include <linux/types.h>
7 #include <linux/compiler.h> 7 #include <linux/compiler.h>
8 #include <linux/spinlock.h> 8 #include <linux/spinlock.h>
9 9
10 struct btrfs_trans_handle; 10 struct btrfs_trans_handle;
11 struct btrfs_root; 11 struct btrfs_root;
12 struct btrfs_space_info; 12 struct btrfs_space_info;
13 struct btrfs_block_rsv; 13 struct btrfs_block_rsv;
14 struct btrfs_fs_info; 14 struct btrfs_fs_info;
15 enum btrfs_reserve_flush_enum; 15 enum btrfs_reserve_flush_enum;
16 16
17 /* 17 /*
18 * Types of block reserves 18 * Types of block reserves
19 */ 19 */
20 enum btrfs_rsv_type { 20 enum btrfs_rsv_type {
21 BTRFS_BLOCK_RSV_GLOBAL, 21 BTRFS_BLOCK_RSV_GLOBAL,
22 BTRFS_BLOCK_RSV_DELALLOC, 22 BTRFS_BLOCK_RSV_DELALLOC,
23 BTRFS_BLOCK_RSV_TRANS, 23 BTRFS_BLOCK_RSV_TRANS,
24 BTRFS_BLOCK_RSV_CHUNK, 24 BTRFS_BLOCK_RSV_CHUNK,
25 BTRFS_BLOCK_RSV_DELOPS, 25 BTRFS_BLOCK_RSV_DELOPS,
26 BTRFS_BLOCK_RSV_DELREFS, 26 BTRFS_BLOCK_RSV_DELREFS,
27 BTRFS_BLOCK_RSV_EMPTY, 27 BTRFS_BLOCK_RSV_EMPTY,
28 BTRFS_BLOCK_RSV_TEMP, 28 BTRFS_BLOCK_RSV_TEMP,
29 }; 29 };
30 30
31 struct btrfs_block_rsv { 31 struct btrfs_block_rsv {
32 u64 size; 32 u64 size;
33 u64 reserved; 33 u64 reserved;
34 struct btrfs_space_info *space_info; 34 struct btrfs_space_info *space_info;
35 spinlock_t lock; 35 spinlock_t lock;
36 bool full; 36 bool full;
37 bool failfast; 37 bool failfast;
38 /* Block reserve type, one of BTRFS_BL 38 /* Block reserve type, one of BTRFS_BLOCK_RSV_* */
39 enum btrfs_rsv_type type:8; 39 enum btrfs_rsv_type type:8;
40 40
41 /* 41 /*
42 * Qgroup equivalent for @size @reserv 42 * Qgroup equivalent for @size @reserved
43 * 43 *
44 * Unlike normal @size/@reserved for i 44 * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
45 * about things like csum size nor how 45 * about things like csum size nor how many tree blocks it will need to
46 * reserve. 46 * reserve.
47 * 47 *
48 * Qgroup cares more about net change 48 * Qgroup cares more about net change of the extent usage.
49 * 49 *
50 * So for one newly inserted file exte 50 * So for one newly inserted file extent, in worst case it will cause
51 * leaf split and level increase, node 51 * leaf split and level increase, nodesize for each file extent is
52 * already too much. 52 * already too much.
53 * 53 *
54 * In short, qgroup_size/reserved is t 54 * In short, qgroup_size/reserved is the upper limit of possible needed
55 * qgroup metadata reservation. 55 * qgroup metadata reservation.
56 */ 56 */
57 u64 qgroup_rsv_size; 57 u64 qgroup_rsv_size;
58 u64 qgroup_rsv_reserved; 58 u64 qgroup_rsv_reserved;
59 }; 59 };
60 60
61 void btrfs_init_block_rsv(struct btrfs_block_r 61 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, enum btrfs_rsv_type type);
62 void btrfs_init_root_block_rsv(struct btrfs_ro 62 void btrfs_init_root_block_rsv(struct btrfs_root *root);
63 struct btrfs_block_rsv *btrfs_alloc_block_rsv( 63 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
64 64 enum btrfs_rsv_type type);
65 void btrfs_init_metadata_block_rsv(struct btrf 65 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
66 struct btrf 66 struct btrfs_block_rsv *rsv,
67 enum btrfs_ 67 enum btrfs_rsv_type type);
68 void btrfs_free_block_rsv(struct btrfs_fs_info 68 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
69 struct btrfs_block_r 69 struct btrfs_block_rsv *rsv);
70 int btrfs_block_rsv_add(struct btrfs_fs_info * 70 int btrfs_block_rsv_add(struct btrfs_fs_info *fs_info,
71 struct btrfs_block_rsv 71 struct btrfs_block_rsv *block_rsv, u64 num_bytes,
72 enum btrfs_reserve_flu 72 enum btrfs_reserve_flush_enum flush);
73 int btrfs_block_rsv_check(struct btrfs_block_r 73 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_percent);
74 int btrfs_block_rsv_refill(struct btrfs_fs_inf 74 int btrfs_block_rsv_refill(struct btrfs_fs_info *fs_info,
75 struct btrfs_block_ 75 struct btrfs_block_rsv *block_rsv, u64 num_bytes,
76 enum btrfs_reserve_ 76 enum btrfs_reserve_flush_enum flush);
77 int btrfs_block_rsv_migrate(struct btrfs_block 77 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
78 struct btrfs_block 78 struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
79 bool update_size); 79 bool update_size);
80 int btrfs_block_rsv_use_bytes(struct btrfs_blo 80 int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes);
81 void btrfs_block_rsv_add_bytes(struct btrfs_bl 81 void btrfs_block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
82 u64 num_bytes, 82 u64 num_bytes, bool update_size);
83 u64 btrfs_block_rsv_release(struct btrfs_fs_in 83 u64 btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
84 struct btrfs_blo 84 struct btrfs_block_rsv *block_rsv,
85 u64 num_bytes, u 85 u64 num_bytes, u64 *qgroup_to_release);
86 void btrfs_update_global_block_rsv(struct btrf 86 void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info);
87 void btrfs_init_global_block_rsv(struct btrfs_ 87 void btrfs_init_global_block_rsv(struct btrfs_fs_info *fs_info);
88 void btrfs_release_global_block_rsv(struct btr 88 void btrfs_release_global_block_rsv(struct btrfs_fs_info *fs_info);
89 struct btrfs_block_rsv *btrfs_use_block_rsv(st 89 struct btrfs_block_rsv *btrfs_use_block_rsv(struct btrfs_trans_handle *trans,
90 st 90 struct btrfs_root *root,
91 u3 91 u32 blocksize);
92 int btrfs_check_trunc_cache_free_space(const s !! 92 int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info,
93 struct 93 struct btrfs_block_rsv *rsv);
94 static inline void btrfs_unuse_block_rsv(struc 94 static inline void btrfs_unuse_block_rsv(struct btrfs_fs_info *fs_info,
95 struc 95 struct btrfs_block_rsv *block_rsv,
96 u32 b 96 u32 blocksize)
97 { 97 {
98 btrfs_block_rsv_add_bytes(block_rsv, b 98 btrfs_block_rsv_add_bytes(block_rsv, blocksize, false);
99 btrfs_block_rsv_release(fs_info, block 99 btrfs_block_rsv_release(fs_info, block_rsv, 0, NULL);
100 } 100 }
101 101
102 /* 102 /*
103 * Fast path to check if the reserve is full, 103 * Fast path to check if the reserve is full, may be carefully used outside of
104 * locks. 104 * locks.
105 */ 105 */
106 static inline bool btrfs_block_rsv_full(const 106 static inline bool btrfs_block_rsv_full(const struct btrfs_block_rsv *rsv)
107 { 107 {
108 return data_race(rsv->full); 108 return data_race(rsv->full);
109 } 109 }
110 110
111 /* 111 /*
112 * Get the reserved mount of a block reserve i 112 * Get the reserved mount of a block reserve in a context where getting a stale
113 * value is acceptable, instead of accessing i 113 * value is acceptable, instead of accessing it directly and trigger data race
114 * warning from KCSAN. 114 * warning from KCSAN.
115 */ 115 */
116 static inline u64 btrfs_block_rsv_reserved(str 116 static inline u64 btrfs_block_rsv_reserved(struct btrfs_block_rsv *rsv)
117 { 117 {
118 u64 ret; 118 u64 ret;
119 119
120 spin_lock(&rsv->lock); 120 spin_lock(&rsv->lock);
121 ret = rsv->reserved; 121 ret = rsv->reserved;
122 spin_unlock(&rsv->lock); 122 spin_unlock(&rsv->lock);
123 123
124 return ret; 124 return ret;
125 } 125 }
126 126
127 /* 127 /*
128 * Get the size of a block reserve in a contex 128 * Get the size of a block reserve in a context where getting a stale value is
129 * acceptable, instead of accessing it directl 129 * acceptable, instead of accessing it directly and trigger data race warning
130 * from KCSAN. 130 * from KCSAN.
131 */ 131 */
132 static inline u64 btrfs_block_rsv_size(struct 132 static inline u64 btrfs_block_rsv_size(struct btrfs_block_rsv *rsv)
133 { 133 {
134 u64 ret; 134 u64 ret;
135 135
136 spin_lock(&rsv->lock); 136 spin_lock(&rsv->lock);
137 ret = rsv->size; 137 ret = rsv->size;
138 spin_unlock(&rsv->lock); 138 spin_unlock(&rsv->lock);
139 139
140 return ret; 140 return ret;
141 } 141 }
142 142
143 #endif /* BTRFS_BLOCK_RSV_H */ 143 #endif /* BTRFS_BLOCK_RSV_H */
144 144
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