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 void *cur, *orig; 41 struct page *page; 42 struct page **pages; 43 struct btrfs_fs_info *fs_info; 44 struct inode *inode; 45 unsigned long size; 46 int index; 47 int num_pages; 48 int entries; 49 int bitmaps; 50 unsigned check_crcs:1; 51 }; 52 53 struct inode *lookup_free_space_inode( 54 struct btrfs_block_group_cache *block_group, 55 struct btrfs_path *path); 56 int create_free_space_inode(struct btrfs_trans_handle *trans, 57 struct btrfs_block_group_cache *block_group, 58 struct btrfs_path *path); 59 60 int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info, 61 struct btrfs_block_rsv *rsv); 62 int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans, 63 struct btrfs_block_group_cache *block_group, 64 struct inode *inode); 65 int load_free_space_cache(struct btrfs_block_group_cache *block_group); 66 int btrfs_wait_cache_io(struct btrfs_trans_handle *trans, 67 struct btrfs_block_group_cache *block_group, 68 struct btrfs_path *path); 69 int btrfs_write_out_cache(struct btrfs_trans_handle *trans, 70 struct btrfs_block_group_cache *block_group, 71 struct btrfs_path *path); 72 struct inode *lookup_free_ino_inode(struct btrfs_root *root, 73 struct btrfs_path *path); 74 int create_free_ino_inode(struct btrfs_root *root, 75 struct btrfs_trans_handle *trans, 76 struct btrfs_path *path); 77 int load_free_ino_cache(struct btrfs_fs_info *fs_info, 78 struct btrfs_root *root); 79 int btrfs_write_out_ino_cache(struct btrfs_root *root, 80 struct btrfs_trans_handle *trans, 81 struct btrfs_path *path, 82 struct inode *inode); 83 84 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group); 85 int __btrfs_add_free_space(struct btrfs_fs_info *fs_info, 86 struct btrfs_free_space_ctl *ctl, 87 u64 bytenr, u64 size); 88 int btrfs_add_free_space(struct btrfs_block_group_cache *block_group, 89 u64 bytenr, u64 size); 90 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, 91 u64 bytenr, u64 size); 92 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl); 93 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache 94 *block_group); 95 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, 96 u64 offset, u64 bytes, u64 empty_size, 97 u64 *max_extent_size); 98 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root); 99 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, 100 u64 bytes); 101 int btrfs_find_space_cluster(struct btrfs_block_group_cache *block_group, 102 struct btrfs_free_cluster *cluster, 103 u64 offset, u64 bytes, u64 empty_size); 104 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster); 105 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, 106 struct btrfs_free_cluster *cluster, u64 bytes, 107 u64 min_start, u64 *max_extent_size); 108 int btrfs_return_cluster_to_free_space( 109 struct btrfs_block_group_cache *block_group, 110 struct btrfs_free_cluster *cluster); 111 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, 112 u64 *trimmed, u64 start, u64 end, u64 minlen); 113 114 /* Support functions for running our sanity tests */ 115 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 116 int test_add_free_space_entry(struct btrfs_block_group_cache *cache, 117 u64 offset, u64 bytes, bool bitmap); 118 int test_check_exists(struct btrfs_block_group_cache *cache, 119 u64 offset, u64 bytes); 120 #endif 121 122 #endif 123