1 /* 2 * Copyright (C) 2009 Oracle. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public 6 * License v2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public 14 * License along with this program; if not, write to the 15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16 * Boston, MA 021110-1307, USA. 17 */ 18 19 #ifndef __BTRFS_FREE_SPACE_CACHE 20 #define __BTRFS_FREE_SPACE_CACHE 21 22 struct btrfs_free_space { 23 struct rb_node offset_index; 24 u64 offset; 25 u64 bytes; 26 unsigned long *bitmap; 27 struct list_head list; 28 }; 29 30 struct btrfs_free_space_ctl { 31 spinlock_t tree_lock; 32 struct rb_root free_space_offset; 33 u64 free_space; 34 int extents_thresh; 35 int free_extents; 36 int total_bitmaps; 37 int unit; 38 u64 start; 39 struct btrfs_free_space_op *op; 40 void *private; 41 struct mutex cache_writeout_mutex; 42 struct list_head trimming_ranges; 43 }; 44 45 struct btrfs_free_space_op { 46 void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl); 47 bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl, 48 struct btrfs_free_space *info); 49 }; 50 51 struct inode *lookup_free_space_inode(struct btrfs_root *root, 52 struct btrfs_block_group_cache 53 *block_group, struct btrfs_path *path); 54 int create_free_space_inode(struct btrfs_root *root, 55 struct btrfs_trans_handle *trans, 56 struct btrfs_block_group_cache *block_group, 57 struct btrfs_path *path); 58 59 int btrfs_check_trunc_cache_free_space(struct btrfs_root *root, 60 struct btrfs_block_rsv *rsv); 61 int btrfs_truncate_free_space_cache(struct btrfs_root *root, 62 struct btrfs_trans_handle *trans, 63 struct inode *inode); 64 int load_free_space_cache(struct btrfs_fs_info *fs_info, 65 struct btrfs_block_group_cache *block_group); 66 int btrfs_write_out_cache(struct btrfs_root *root, 67 struct btrfs_trans_handle *trans, 68 struct btrfs_block_group_cache *block_group, 69 struct btrfs_path *path); 70 71 struct inode *lookup_free_ino_inode(struct btrfs_root *root, 72 struct btrfs_path *path); 73 int create_free_ino_inode(struct btrfs_root *root, 74 struct btrfs_trans_handle *trans, 75 struct btrfs_path *path); 76 int load_free_ino_cache(struct btrfs_fs_info *fs_info, 77 struct btrfs_root *root); 78 int btrfs_write_out_ino_cache(struct btrfs_root *root, 79 struct btrfs_trans_handle *trans, 80 struct btrfs_path *path, 81 struct inode *inode); 82 83 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group); 84 int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl, 85 u64 bytenr, u64 size); 86 static inline int 87 btrfs_add_free_space(struct btrfs_block_group_cache *block_group, 88 u64 bytenr, u64 size) 89 { 90 return __btrfs_add_free_space(block_group->free_space_ctl, 91 bytenr, size); 92 } 93 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, 94 u64 bytenr, u64 size); 95 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl); 96 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache 97 *block_group); 98 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, 99 u64 offset, u64 bytes, u64 empty_size, 100 u64 *max_extent_size); 101 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root); 102 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, 103 u64 bytes); 104 int btrfs_find_space_cluster(struct btrfs_root *root, 105 struct btrfs_block_group_cache *block_group, 106 struct btrfs_free_cluster *cluster, 107 u64 offset, u64 bytes, u64 empty_size); 108 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster); 109 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, 110 struct btrfs_free_cluster *cluster, u64 bytes, 111 u64 min_start, u64 *max_extent_size); 112 int btrfs_return_cluster_to_free_space( 113 struct btrfs_block_group_cache *block_group, 114 struct btrfs_free_cluster *cluster); 115 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, 116 u64 *trimmed, u64 start, u64 end, u64 minlen); 117 118 /* Support functions for runnint our sanity tests */ 119 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 120 int test_add_free_space_entry(struct btrfs_block_group_cache *cache, 121 u64 offset, u64 bytes, bool bitmap); 122 int test_check_exists(struct btrfs_block_group_cache *cache, 123 u64 offset, u64 bytes); 124 #endif 125 126 #endif 127