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 btrfs_rsv_type { 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 bool full; 29 bool failfast; 30 /* Block reserve type, one of BTRFS_BLOCK_RSV_* */ 31 enum btrfs_rsv_type type:8; 32 33 /* 34 * Qgroup equivalent for @size @reserved 35 * 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 38 * reserve. 39 * 40 * Qgroup cares more about net change of the extent usage. 41 * 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 44 * already too much. 45 * 46 * In short, qgroup_size/reserved is the upper limit of possible needed 47 * qgroup metadata reservation. 48 */ 49 u64 qgroup_rsv_size; 50 u64 qgroup_rsv_reserved; 51 }; 52 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, 71 bool update_size); 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, 75 int min_factor); 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, 86 u32 blocksize); 87 static inline void btrfs_unuse_block_rsv(struct btrfs_fs_info *fs_info, 88 struct btrfs_block_rsv *block_rsv, 89 u32 blocksize) 90 { 91 btrfs_block_rsv_add_bytes(block_rsv, blocksize, false); 92 btrfs_block_rsv_release(fs_info, block_rsv, 0, NULL); 93 } 94 95 /* 96 * Fast path to check if the reserve is full, may be carefully used outside of 97 * locks. 98 */ 99 static inline bool btrfs_block_rsv_full(const struct btrfs_block_rsv *rsv) 100 { 101 return data_race(rsv->full); 102 } 103 104 #endif /* BTRFS_BLOCK_RSV_H */ 105