1 /* SPDX-License-Identifier: GPL-2.0 */
3 #ifndef BTRFS_BLOCK_RSV_H
4 #define BTRFS_BLOCK_RSV_H
6 struct btrfs_trans_handle;
7 enum btrfs_reserve_flush_enum;
10 * Types of block reserves
13 BTRFS_BLOCK_RSV_GLOBAL,
14 BTRFS_BLOCK_RSV_DELALLOC,
15 BTRFS_BLOCK_RSV_TRANS,
16 BTRFS_BLOCK_RSV_CHUNK,
17 BTRFS_BLOCK_RSV_DELOPS,
18 BTRFS_BLOCK_RSV_DELREFS,
19 BTRFS_BLOCK_RSV_EMPTY,
23 struct btrfs_block_rsv {
26 struct btrfs_space_info *space_info;
30 /* Block reserve type, one of BTRFS_BLOCK_RSV_* */
31 enum btrfs_rsv_type type:8;
34 * Qgroup equivalent for @size @reserved
36 * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
37 * about things like csum size nor how many tree blocks it will need to
40 * Qgroup cares more about net change of the extent usage.
42 * So for one newly inserted file extent, in worst case it will cause
43 * leaf split and level increase, nodesize for each file extent is
46 * In short, qgroup_size/reserved is the upper limit of possible needed
47 * qgroup metadata reservation.
50 u64 qgroup_rsv_reserved;
53 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, enum btrfs_rsv_type type);
54 void btrfs_init_root_block_rsv(struct btrfs_root *root);
55 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
56 enum btrfs_rsv_type type);
57 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
58 struct btrfs_block_rsv *rsv,
59 enum btrfs_rsv_type type);
60 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
61 struct btrfs_block_rsv *rsv);
62 int btrfs_block_rsv_add(struct btrfs_fs_info *fs_info,
63 struct btrfs_block_rsv *block_rsv, u64 num_bytes,
64 enum btrfs_reserve_flush_enum flush);
65 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
66 int btrfs_block_rsv_refill(struct btrfs_fs_info *fs_info,
67 struct btrfs_block_rsv *block_rsv, u64 min_reserved,
68 enum btrfs_reserve_flush_enum flush);
69 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
70 struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
72 int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes);
73 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
74 struct btrfs_block_rsv *dest, u64 num_bytes,
76 void btrfs_block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
77 u64 num_bytes, bool update_size);
78 u64 btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
79 struct btrfs_block_rsv *block_rsv,
80 u64 num_bytes, u64 *qgroup_to_release);
81 void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info);
82 void btrfs_init_global_block_rsv(struct btrfs_fs_info *fs_info);
83 void btrfs_release_global_block_rsv(struct btrfs_fs_info *fs_info);
84 struct btrfs_block_rsv *btrfs_use_block_rsv(struct btrfs_trans_handle *trans,
85 struct btrfs_root *root,
87 static inline void btrfs_unuse_block_rsv(struct btrfs_fs_info *fs_info,
88 struct btrfs_block_rsv *block_rsv,
91 btrfs_block_rsv_add_bytes(block_rsv, blocksize, false);
92 btrfs_block_rsv_release(fs_info, block_rsv, 0, NULL);
96 * Fast path to check if the reserve is full, may be carefully used outside of
99 static inline bool btrfs_block_rsv_full(const struct btrfs_block_rsv *rsv)
101 return data_race(rsv->full);
105 * Get the reserved mount of a block reserve in a context where getting a stale
106 * value is acceptable, instead of accessing it directly and trigger data race
107 * warning from KCSAN.
109 static inline u64 btrfs_block_rsv_reserved(struct btrfs_block_rsv *rsv)
113 spin_lock(&rsv->lock);
115 spin_unlock(&rsv->lock);
121 * Get the size of a block reserve in a context where getting a stale value is
122 * acceptable, instead of accessing it directly and trigger data race warning
125 static inline u64 btrfs_block_rsv_size(struct btrfs_block_rsv *rsv)
129 spin_lock(&rsv->lock);
131 spin_unlock(&rsv->lock);
136 #endif /* BTRFS_BLOCK_RSV_H */