| Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2008 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 | struct btrfs_extent_info { |
| 20 | u64 bytenr; |
| 21 | u64 num_bytes; |
| 22 | u64 objectid; |
| 23 | u64 offset; |
| 24 | }; |
| 25 | |
| 26 | struct btrfs_leaf_ref { |
| 27 | struct rb_node rb_node; |
| 28 | struct btrfs_key key; |
| 29 | int in_tree; |
| 30 | atomic_t usage; |
| 31 | |
| 32 | u64 bytenr; |
| 33 | u64 owner; |
| 34 | u64 generation; |
| 35 | int nritems; |
| 36 | struct btrfs_extent_info extents[]; |
| 37 | }; |
| 38 | |
| 39 | struct btrfs_leaf_ref_tree { |
| 40 | struct rb_root root; |
| 41 | struct btrfs_leaf_ref *last; |
| 42 | u64 generation; |
| 43 | spinlock_t lock; |
| 44 | }; |
| 45 | |
| 46 | static inline size_t btrfs_leaf_ref_size(int nr_extents) |
| 47 | { |
| 48 | return sizeof(struct btrfs_leaf_ref) + |
| 49 | sizeof(struct btrfs_extent_info) * nr_extents; |
| 50 | } |
| 51 | |
| 52 | static inline void btrfs_leaf_ref_tree_init(struct btrfs_leaf_ref_tree *tree) |
| 53 | { |
| 54 | tree->root.rb_node = NULL; |
| 55 | tree->last = NULL; |
| 56 | tree->generation = 0; |
| 57 | spin_lock_init(&tree->lock); |
| 58 | } |
| 59 | |
| 60 | static inline int btrfs_leaf_ref_tree_empty(struct btrfs_leaf_ref_tree *tree) |
| 61 | { |
| 62 | return RB_EMPTY_ROOT(&tree->root); |
| 63 | } |
| 64 | |
| 65 | void btrfs_leaf_ref_tree_init(struct btrfs_leaf_ref_tree *tree); |
| 66 | struct btrfs_leaf_ref *btrfs_alloc_leaf_ref(int nr_extents); |
| 67 | void btrfs_free_leaf_ref(struct btrfs_leaf_ref *ref); |
| 68 | struct btrfs_leaf_ref *btrfs_lookup_leaf_ref(struct btrfs_root *root, |
| 69 | struct btrfs_key *key); |
| 70 | int btrfs_add_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref); |
| 71 | int btrfs_remove_leaf_refs(struct btrfs_root *root); |
| 72 | int btrfs_remove_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref); |