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_root *root, 55 struct btrfs_block_group_cache 56 *block_group, struct btrfs_path *path); 57 int create_free_space_inode(struct btrfs_root *root, 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_root *root, 63 struct btrfs_block_rsv *rsv); 64 int btrfs_truncate_free_space_cache(struct btrfs_root *root, 65 struct btrfs_trans_handle *trans, 66 struct btrfs_block_group_cache *block_group, 67 struct inode *inode); 68 int load_free_space_cache(struct btrfs_fs_info *fs_info, 69 struct btrfs_block_group_cache *block_group); 70 int btrfs_wait_cache_io(struct btrfs_root *root, 71 struct btrfs_trans_handle *trans, 72 struct btrfs_block_group_cache *block_group, 73 struct btrfs_io_ctl *io_ctl, 74 struct btrfs_path *path, u64 offset); 75 int btrfs_write_out_cache(struct btrfs_root *root, 76 struct btrfs_trans_handle *trans, 77 struct btrfs_block_group_cache *block_group, 78 struct btrfs_path *path); 79 struct inode *lookup_free_ino_inode(struct btrfs_root *root, 80 struct btrfs_path *path); 81 int create_free_ino_inode(struct btrfs_root *root, 82 struct btrfs_trans_handle *trans, 83 struct btrfs_path *path); 84 int load_free_ino_cache(struct btrfs_fs_info *fs_info, 85 struct btrfs_root *root); 86 int btrfs_write_out_ino_cache(struct btrfs_root *root, 87 struct btrfs_trans_handle *trans, 88 struct btrfs_path *path, 89 struct inode *inode); 90 91 void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group); 92 int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl, 93 u64 bytenr, u64 size); 94 static inline int 95 btrfs_add_free_space(struct btrfs_block_group_cache *block_group, 96 u64 bytenr, u64 size) 97 { 98 return __btrfs_add_free_space(block_group->free_space_ctl, 99 bytenr, size); 100 } 101 int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, 102 u64 bytenr, u64 size); 103 void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl); 104 void btrfs_remove_free_space_cache(struct btrfs_block_group_cache 105 *block_group); 106 u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, 107 u64 offset, u64 bytes, u64 empty_size, 108 u64 *max_extent_size); 109 u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root); 110 void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, 111 u64 bytes); 112 int btrfs_find_space_cluster(struct btrfs_root *root, 113 struct btrfs_block_group_cache *block_group, 114 struct btrfs_free_cluster *cluster, 115 u64 offset, u64 bytes, u64 empty_size); 116 void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster); 117 u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, 118 struct btrfs_free_cluster *cluster, u64 bytes, 119 u64 min_start, u64 *max_extent_size); 120 int btrfs_return_cluster_to_free_space( 121 struct btrfs_block_group_cache *block_group, 122 struct btrfs_free_cluster *cluster); 123 int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, 124 u64 *trimmed, u64 start, u64 end, u64 minlen); 125 126 /* Support functions for running our sanity tests */ 127 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 128 int test_add_free_space_entry(struct btrfs_block_group_cache *cache, 129 u64 offset, u64 bytes, bool bitmap); 130 int test_check_exists(struct btrfs_block_group_cache *cache, 131 u64 offset, u64 bytes); 132 #endif 133 134 #endif 135