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 /* 10 * This is the trim state of an extent or bitmap. 11 * 12 * BTRFS_TRIM_STATE_TRIMMING is special and used to maintain the state of a 13 * bitmap as we may need several trims to fully trim a single bitmap entry. 14 * This is reset should any free space other than trimmed space be added to the 15 * bitmap. 16 */ 17 enum btrfs_trim_state { 18 BTRFS_TRIM_STATE_UNTRIMMED, 19 BTRFS_TRIM_STATE_TRIMMED, 20 BTRFS_TRIM_STATE_TRIMMING, 21 }; 22 23 struct btrfs_free_space { 24 struct rb_node offset_index; 25 struct rb_node bytes_index; 26 u64 offset; 27 u64 bytes; 28 u64 max_extent_size; 29 unsigned long *bitmap; 30 struct list_head list; 31 enum btrfs_trim_state trim_state; 32 s32 bitmap_extents; 33 }; 34 35 static inline bool btrfs_free_space_trimmed(struct btrfs_free_space *info) 36 { 37 return (info->trim_state == BTRFS_TRIM_STATE_TRIMMED); 38 } 39 40 static inline bool btrfs_free_space_trimming_bitmap( 41 struct btrfs_free_space *info) 42 { 43 return (info->trim_state == BTRFS_TRIM_STATE_TRIMMING); 44 } 45 46 struct btrfs_free_space_ctl { 47 spinlock_t tree_lock; 48 struct rb_root free_space_offset; 49 struct rb_root_cached free_space_bytes; 50 u64 free_space; 51 int extents_thresh; 52 int free_extents; 53 int total_bitmaps; 54 int unit; 55 u64 start; 56 s32 discardable_extents[BTRFS_STAT_NR_ENTRIES]; 57 s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES]; 58 const struct btrfs_free_space_op *op; 59 struct btrfs_block_group *block_group; 60 struct mutex cache_writeout_mutex; 61 struct list_head trimming_ranges; 62 }; 63 64 struct btrfs_free_space_op { 65 bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl, 66 struct btrfs_free_space *info); 67 }; 68 69 struct btrfs_io_ctl { 70 void *cur, *orig; 71 struct page *page; 72 struct page **pages; 73 struct btrfs_fs_info *fs_info; 74 struct inode *inode; 75 unsigned long size; 76 int index; 77 int num_pages; 78 int entries; 79 int bitmaps; 80 }; 81 82 struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group, 83 struct btrfs_path *path); 84 int create_free_space_inode(struct btrfs_trans_handle *trans, 85 struct btrfs_block_group *block_group, 86 struct btrfs_path *path); 87 int btrfs_remove_free_space_inode(struct btrfs_trans_handle *trans, 88 struct inode *inode, 89 struct btrfs_block_group *block_group); 90 91 int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info, 92 struct btrfs_block_rsv *rsv); 93 int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans, 94 struct btrfs_block_group *block_group, 95 struct inode *inode); 96 int load_free_space_cache(struct btrfs_block_group *block_group); 97 int btrfs_wait_cache_io(struct btrfs_trans_handle *trans, 98 struct btrfs_block_group *block_group, 99 struct btrfs_path *path); 100 int btrfs_write_out_cache(struct btrfs_trans_handle *trans, 101 struct btrfs_block_group *block_group, 102 struct btrfs_path *path); 103 104 void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group, 105 struct btrfs_free_space_ctl *ctl); 106 int __btrfs_add_free_space(struct btrfs_block_group *block_group, u64 bytenr, 107 u64 size, enum btrfs_trim_state trim_state); 108 int btrfs_add_free_space(struct btrfs_block_group *block_group, 109 u64 bytenr, u64 size); 110 int btrfs_add_free_space_unused(struct btrfs_block_group *block_group, 111 u64 bytenr, u64 size); 112 int btrfs_add_free_space_async_trimmed(struct btrfs_block_group *block_group, 113 u64 bytenr, u64 size); 114 int btrfs_remove_free_space(struct btrfs_block_group *block_group, 115 u64 bytenr, u64 size); 116 void btrfs_remove_free_space_cache(struct btrfs_block_group *block_group); 117 bool btrfs_is_free_space_trimmed(struct btrfs_block_group *block_group); 118 u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group, 119 u64 offset, u64 bytes, u64 empty_size, 120 u64 *max_extent_size); 121 void btrfs_dump_free_space(struct btrfs_block_group *block_group, 122 u64 bytes); 123 int btrfs_find_space_cluster(struct btrfs_block_group *block_group, 124 struct btrfs_free_cluster *cluster, 125 u64 offset, u64 bytes, u64 empty_size); 126 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster); 127 u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group, 128 struct btrfs_free_cluster *cluster, u64 bytes, 129 u64 min_start, u64 *max_extent_size); 130 void btrfs_return_cluster_to_free_space( 131 struct btrfs_block_group *block_group, 132 struct btrfs_free_cluster *cluster); 133 int btrfs_trim_block_group(struct btrfs_block_group *block_group, 134 u64 *trimmed, u64 start, u64 end, u64 minlen); 135 int btrfs_trim_block_group_extents(struct btrfs_block_group *block_group, 136 u64 *trimmed, u64 start, u64 end, u64 minlen, 137 bool async); 138 int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group, 139 u64 *trimmed, u64 start, u64 end, u64 minlen, 140 u64 maxlen, bool async); 141 142 bool btrfs_free_space_cache_v1_active(struct btrfs_fs_info *fs_info); 143 int btrfs_set_free_space_cache_v1_active(struct btrfs_fs_info *fs_info, bool active); 144 /* Support functions for running our sanity tests */ 145 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 146 int test_add_free_space_entry(struct btrfs_block_group *cache, 147 u64 offset, u64 bytes, bool bitmap); 148 int test_check_exists(struct btrfs_block_group *cache, u64 offset, u64 bytes); 149 #endif 150 151 #endif 152