77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/*
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* Copyright (C) 2008 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __REFCACHE__
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#define __REFCACHE__
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struct btrfs_extent_info {
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/* bytenr and num_bytes find the extent in the extent allocation tree */
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u64 bytenr;
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u64 num_bytes;
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/* objectid and offset find the back reference for the file */
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u64 objectid;
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u64 offset;
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};
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struct btrfs_leaf_ref {
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struct rb_node rb_node;
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struct btrfs_leaf_ref_tree *tree;
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int in_tree;
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atomic_t usage;
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u64 root_gen;
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u64 bytenr;
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u64 owner;
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u64 generation;
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int nritems;
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struct list_head list;
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struct btrfs_extent_info extents[];
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};
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static inline size_t btrfs_leaf_ref_size(int nr_extents)
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{
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return sizeof(struct btrfs_leaf_ref) +
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sizeof(struct btrfs_extent_info) * nr_extents;
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}
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static inline void btrfs_leaf_ref_tree_init(struct btrfs_leaf_ref_tree *tree)
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{
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tree->root.rb_node = NULL;
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INIT_LIST_HEAD(&tree->list);
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spin_lock_init(&tree->lock);
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}
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static inline int btrfs_leaf_ref_tree_empty(struct btrfs_leaf_ref_tree *tree)
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{
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return RB_EMPTY_ROOT(&tree->root);
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}
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void btrfs_leaf_ref_tree_init(struct btrfs_leaf_ref_tree *tree);
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struct btrfs_leaf_ref *btrfs_alloc_leaf_ref(struct btrfs_root *root,
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int nr_extents);
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void btrfs_free_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref);
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struct btrfs_leaf_ref *btrfs_lookup_leaf_ref(struct btrfs_root *root,
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u64 bytenr);
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int btrfs_add_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref,
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int shared);
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int btrfs_remove_leaf_refs(struct btrfs_root *root, u64 max_root_gen,
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int shared);
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int btrfs_remove_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref);
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#endif
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