1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2009 Oracle. All rights reserved. 4 */ 5 6 #ifndef BTRFS_FREE_SPACE_CACHE_H 7 #define BTRFS_FREE_SPACE_CACHE_H 8 9 struct btrfs_free_space { 10 struct rb_node offset_index; 11 u64 offset; 12 u64 bytes; 13 u64 max_extent_size; 14 unsigned long *bitmap; 15 struct list_head list; 16 }; 17 18 struct btrfs_free_space_ctl { 19 spinlock_t tree_lock; 20 struct rb_root free_space_offset; 21 u64 free_space; 22 int extents_thresh; 23 int free_extents; 24 int total_bitmaps; 25 int unit; 26 u64 start; 27 const struct btrfs_free_space_op *op; 28 void *private; 29 struct mutex cache_writeout_mutex; 30 struct list_head trimming_ranges; 31 }; 32 33 struct btrfs_free_space_op { 34 void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl); 35 bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl, 36 struct btrfs_free_space *info); 37 }; 38 39 struct btrfs_io_ctl; 40 41 struct inode *lookup_free_space_inode( 42 struct btrfs_block_group_cache *block_group, 43 struct btrfs_path *path); 44 int create_free_space_inode(struct btrfs_trans_handle *trans, 45 struct btrfs_block_group_cache *block_group, 46 struct btrfs_path *path); 47 48 int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info, 49 struct btrfs_block_rsv *rsv); 50 int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans, 51 struct btrfs_block_group_cache *block_group, 52 struct inode *inode); 53 int load_free_space_cache(struct btrfs_block_group_cache *block_group); 54 int btrfs_wait_cache_io(struct btrfs_trans_handle *trans, 55 struct btrfs_block_group_cache *block_group, 56 struct btrfs_path *path); 57 int btrfs_write_out_cache(struct btrfs_trans_handle *trans, 58 struct btrfs_block_group_cache *block_group, 59 struct btrfs_path *path); 60 struct inode *lookup_free_ino_inode(struct btrfs_root *root, 61 struct btrfs_path *path); 62 int create_free_ino_inode(struct btrfs_root *root, 63 struct btrfs_trans_handle *trans, 64 struct btrfs_path *path); 65 int load_free_ino_cache(struct btrfs_fs_info *fs_info, 66 struct btrfs_root *root); 67 int btrfs_write_out_ino_cache(struct btrfs_root *root, 68 struct btrfs_trans_handle *trans, 69 struct btrfs_path *path, 70 struct inode *inode); 71 72 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group); 73 int __btrfs_add_free_space(struct btrfs_fs_info *fs_info, 74 struct btrfs_free_space_ctl *ctl, 75 u64 bytenr, u64 size); 76 static inline int 77 btrfs_add_free_space(struct btrfs_block_group_cache *block_group, 78 u64 bytenr, u64 size) 79 { 80 return __btrfs_add_free_space(block_group->fs_info, 81 block_group->free_space_ctl, 82 bytenr, size); 83 } 84 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, 85 u64 bytenr, u64 size); 86 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl); 87 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache 88 *block_group); 89 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, 90 u64 offset, u64 bytes, u64 empty_size, 91 u64 *max_extent_size); 92 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root); 93 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, 94 u64 bytes); 95 int btrfs_find_space_cluster(struct btrfs_block_group_cache *block_group, 96 struct btrfs_free_cluster *cluster, 97 u64 offset, u64 bytes, u64 empty_size); 98 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster); 99 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, 100 struct btrfs_free_cluster *cluster, u64 bytes, 101 u64 min_start, u64 *max_extent_size); 102 int btrfs_return_cluster_to_free_space( 103 struct btrfs_block_group_cache *block_group, 104 struct btrfs_free_cluster *cluster); 105 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, 106 u64 *trimmed, u64 start, u64 end, u64 minlen); 107 108 /* Support functions for running our sanity tests */ 109 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 110 int test_add_free_space_entry(struct btrfs_block_group_cache *cache, 111 u64 offset, u64 bytes, bool bitmap); 112 int test_check_exists(struct btrfs_block_group_cache *cache, 113 u64 offset, u64 bytes); 114 #endif 115 116 #endif 117