| 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 runnint 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 |