1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef BTRFS_BLOCK_RSV_H
4 #define BTRFS_BLOCK_RSV_H
5
6 struct btrfs_trans_handle;
7 enum btrfs_reserve_flush_enum;
8
9 /*
10 * Types of block reserves
11 */
12 enum {
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,
20 BTRFS_BLOCK_RSV_TEMP,
21 };
22
23 struct btrfs_block_rsv {
24 u64 size;
25 u64 reserved;
26 struct btrfs_space_info *space_info;
27 spinlock_t lock;
28 unsigned short full;
29 unsigned short type;
30 unsigned short failfast;
31
32 /*
33 * Qgroup equivalent for @size @reserved
34 *
35 * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
36 * about things like csum size nor how many tree blocks it will need to
37 * reserve.
38 *
39 * Qgroup cares more about net change of the extent usage.
40 *
41 * So for one newly inserted file extent, in worst case it will cause
42 * leaf split and level increase, nodesize for each file extent is
43 * already too much.
44 *
45 * In short, qgroup_size/reserved is the upper limit of possible needed
46 * qgroup metadata reservation.
47 */
48 u64 qgroup_rsv_size;
49 u64 qgroup_rsv_reserved;
50 };
51
52 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
53 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
54 unsigned short type);
55 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
56 struct btrfs_block_rsv *rsv,
57 unsigned short type);
58 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
59 struct btrfs_block_rsv *rsv);
60 int btrfs_block_rsv_add(struct btrfs_root *root,
61 struct btrfs_block_rsv *block_rsv, u64 num_bytes,
62 enum btrfs_reserve_flush_enum flush);
63 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
64 int btrfs_block_rsv_refill(struct btrfs_root *root,
65 struct btrfs_block_rsv *block_rsv, u64 min_reserved,
66 enum btrfs_reserve_flush_enum flush);
67 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
68 struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
69 bool update_size);
70 int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes);
71 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
72 struct btrfs_block_rsv *dest, u64 num_bytes,
73 int min_factor);
74 void btrfs_block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
75 u64 num_bytes, bool update_size);
76 u64 btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
77 struct btrfs_block_rsv *block_rsv,
78 u64 num_bytes, u64 *qgroup_to_release);
79 void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info);
80 void btrfs_init_global_block_rsv(struct btrfs_fs_info *fs_info);
81 void btrfs_release_global_block_rsv(struct btrfs_fs_info *fs_info);
82 struct btrfs_block_rsv *btrfs_use_block_rsv(struct btrfs_trans_handle *trans,
83 struct btrfs_root *root,
84 u32 blocksize);
btrfs_unuse_block_rsv(struct btrfs_fs_info * fs_info,struct btrfs_block_rsv * block_rsv,u32 blocksize)85 static inline void btrfs_unuse_block_rsv(struct btrfs_fs_info *fs_info,
86 struct btrfs_block_rsv *block_rsv,
87 u32 blocksize)
88 {
89 btrfs_block_rsv_add_bytes(block_rsv, blocksize, false);
90 btrfs_block_rsv_release(fs_info, block_rsv, 0, NULL);
91 }
92
93 #endif /* BTRFS_BLOCK_RSV_H */
94