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 struct btrfs_root; 8 enum btrfs_reserve_flush_enum; 9 10 /* 11 * Types of block reserves 12 */ 13 enum btrfs_rsv_type { 14 BTRFS_BLOCK_RSV_GLOBAL, 15 BTRFS_BLOCK_RSV_DELALLOC, 16 BTRFS_BLOCK_RSV_TRANS, 17 BTRFS_BLOCK_RSV_CHUNK, 18 BTRFS_BLOCK_RSV_DELOPS, 19 BTRFS_BLOCK_RSV_DELREFS, 20 BTRFS_BLOCK_RSV_EMPTY, 21 BTRFS_BLOCK_RSV_TEMP, 22 }; 23 24 struct btrfs_block_rsv { 25 u64 size; 26 u64 reserved; 27 struct btrfs_space_info *space_info; 28 spinlock_t lock; 29 bool full; 30 bool failfast; 31 /* Block reserve type, one of BTRFS_BLOCK_RSV_* */ 32 enum btrfs_rsv_type type:8; 33 34 /* 35 * Qgroup equivalent for @size @reserved 36 * 37 * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care 38 * about things like csum size nor how many tree blocks it will need to 39 * reserve. 40 * 41 * Qgroup cares more about net change of the extent usage. 42 * 43 * So for one newly inserted file extent, in worst case it will cause 44 * leaf split and level increase, nodesize for each file extent is 45 * already too much. 46 * 47 * In short, qgroup_size/reserved is the upper limit of possible needed 48 * qgroup metadata reservation. 49 */ 50 u64 qgroup_rsv_size; 51 u64 qgroup_rsv_reserved; 52 }; 53 54 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, enum btrfs_rsv_type type); 55 void btrfs_init_root_block_rsv(struct btrfs_root *root); 56 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info, 57 enum btrfs_rsv_type type); 58 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info, 59 struct btrfs_block_rsv *rsv, 60 enum btrfs_rsv_type type); 61 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info, 62 struct btrfs_block_rsv *rsv); 63 int btrfs_block_rsv_add(struct btrfs_fs_info *fs_info, 64 struct btrfs_block_rsv *block_rsv, u64 num_bytes, 65 enum btrfs_reserve_flush_enum flush); 66 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_percent); 67 int btrfs_block_rsv_refill(struct btrfs_fs_info *fs_info, 68 struct btrfs_block_rsv *block_rsv, u64 num_bytes, 69 enum btrfs_reserve_flush_enum flush); 70 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, 71 struct btrfs_block_rsv *dst_rsv, u64 num_bytes, 72 bool update_size); 73 int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes); 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); 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 /* 94 * Fast path to check if the reserve is full, may be carefully used outside of 95 * locks. 96 */ 97 static inline bool btrfs_block_rsv_full(const struct btrfs_block_rsv *rsv) 98 { 99 return data_race(rsv->full); 100 } 101 102 #endif /* BTRFS_BLOCK_RSV_H */ 103