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 btrfs_io_ctl; 52 53 struct inode *lookup_free_space_inode(struct btrfs_root *root, 54 struct btrfs_block_group_cache 55 *block_group, struct btrfs_path *path); 56 int create_free_space_inode(struct btrfs_root *root, 57 struct btrfs_trans_handle *trans, 58 struct btrfs_block_group_cache *block_group, 59 struct btrfs_path *path); 60 61 int btrfs_check_trunc_cache_free_space(struct btrfs_root *root, 62 struct btrfs_block_rsv *rsv); 63 int btrfs_truncate_free_space_cache(struct btrfs_root *root, 64 struct btrfs_trans_handle *trans, 65 struct btrfs_block_group_cache *block_group, 66 struct inode *inode); 67 int load_free_space_cache(struct btrfs_fs_info *fs_info, 68 struct btrfs_block_group_cache *block_group); 69 int btrfs_wait_cache_io(struct btrfs_root *root, 70 struct btrfs_trans_handle *trans, 71 struct btrfs_block_group_cache *block_group, 72 struct btrfs_io_ctl *io_ctl, 73 struct btrfs_path *path, u64 offset); 74 int btrfs_write_out_cache(struct btrfs_root *root, 75 struct btrfs_trans_handle *trans, 76 struct btrfs_block_group_cache *block_group, 77 struct btrfs_path *path); 78 struct inode *lookup_free_ino_inode(struct btrfs_root *root, 79 struct btrfs_path *path); 80 int create_free_ino_inode(struct btrfs_root *root, 81 struct btrfs_trans_handle *trans, 82 struct btrfs_path *path); 83 int load_free_ino_cache(struct btrfs_fs_info *fs_info, 84 struct btrfs_root *root); 85 int btrfs_write_out_ino_cache(struct btrfs_root *root, 86 struct btrfs_trans_handle *trans, 87 struct btrfs_path *path, 88 struct inode *inode); 89 90 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group); 91 int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl, 92 u64 bytenr, u64 size); 93 static inline int 94 btrfs_add_free_space(struct btrfs_block_group_cache *block_group, 95 u64 bytenr, u64 size) 96 { 97 return __btrfs_add_free_space(block_group->free_space_ctl, 98 bytenr, size); 99 } 100 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, 101 u64 bytenr, u64 size); 102 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl); 103 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache 104 *block_group); 105 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, 106 u64 offset, u64 bytes, u64 empty_size, 107 u64 *max_extent_size); 108 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root); 109 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, 110 u64 bytes); 111 int btrfs_find_space_cluster(struct btrfs_root *root, 112 struct btrfs_block_group_cache *block_group, 113 struct btrfs_free_cluster *cluster, 114 u64 offset, u64 bytes, u64 empty_size); 115 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster); 116 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, 117 struct btrfs_free_cluster *cluster, u64 bytes, 118 u64 min_start, u64 *max_extent_size); 119 int btrfs_return_cluster_to_free_space( 120 struct btrfs_block_group_cache *block_group, 121 struct btrfs_free_cluster *cluster); 122 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, 123 u64 *trimmed, u64 start, u64 end, u64 minlen); 124 125 /* Support functions for runnint our sanity tests */ 126 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 127 int test_add_free_space_entry(struct btrfs_block_group_cache *cache, 128 u64 offset, u64 bytes, bool bitmap); 129 int test_check_exists(struct btrfs_block_group_cache *cache, 130 u64 offset, u64 bytes); 131 #endif 132 133 #endif 134