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 u64 max_extent_size; 27 unsigned long *bitmap; 28 struct list_head list; 29 }; 30 31 struct btrfs_free_space_ctl { 32 spinlock_t tree_lock; 33 struct rb_root free_space_offset; 34 u64 free_space; 35 int extents_thresh; 36 int free_extents; 37 int total_bitmaps; 38 int unit; 39 u64 start; 40 const struct btrfs_free_space_op *op; 41 void *private; 42 struct mutex cache_writeout_mutex; 43 struct list_head trimming_ranges; 44 }; 45 46 struct btrfs_free_space_op { 47 void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl); 48 bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl, 49 struct btrfs_free_space *info); 50 }; 51 52 struct btrfs_io_ctl; 53 54 struct inode *lookup_free_space_inode(struct btrfs_fs_info *fs_info, 55 struct btrfs_block_group_cache 56 *block_group, struct btrfs_path *path); 57 int create_free_space_inode(struct btrfs_fs_info *fs_info, 58 struct btrfs_trans_handle *trans, 59 struct btrfs_block_group_cache *block_group, 60 struct btrfs_path *path); 61 62 int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info, 63 struct btrfs_block_rsv *rsv); 64 int btrfs_truncate_free_space_cache(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_trans_handle *trans, 70 struct btrfs_block_group_cache *block_group, 71 struct btrfs_path *path); 72 int btrfs_write_out_cache(struct btrfs_fs_info *fs_info, 73 struct btrfs_trans_handle *trans, 74 struct btrfs_block_group_cache *block_group, 75 struct btrfs_path *path); 76 struct inode *lookup_free_ino_inode(struct btrfs_root *root, 77 struct btrfs_path *path); 78 int create_free_ino_inode(struct btrfs_root *root, 79 struct btrfs_trans_handle *trans, 80 struct btrfs_path *path); 81 int load_free_ino_cache(struct btrfs_fs_info *fs_info, 82 struct btrfs_root *root); 83 int btrfs_write_out_ino_cache(struct btrfs_root *root, 84 struct btrfs_trans_handle *trans, 85 struct btrfs_path *path, 86 struct inode *inode); 87 88 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group); 89 int __btrfs_add_free_space(struct btrfs_fs_info *fs_info, 90 struct btrfs_free_space_ctl *ctl, 91 u64 bytenr, u64 size); 92 static inline int 93 btrfs_add_free_space(struct btrfs_block_group_cache *block_group, 94 u64 bytenr, u64 size) 95 { 96 return __btrfs_add_free_space(block_group->fs_info, 97 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_fs_info *fs_info, 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 running 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