120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*
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* Copyright (C) 2007 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 __BTRFS_EXTENT_CACHE_H__
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#define __BTRFS_EXTENT_CACHE_H__
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#if BTRFS_FLAT_INCLUDES
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#include "kerncompat.h"
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#include "kernel-lib/rbtree.h"
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#else
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#include <btrfs/kerncompat.h>
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#include <btrfs/rbtree.h>
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#endif /* BTRFS_FLAT_INCLUDES */
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struct cache_tree {
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struct rb_root root;
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};
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struct cache_extent {
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struct rb_node rb_node;
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u64 objectid;
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u64 start;
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u64 size;
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};
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void cache_tree_init(struct cache_tree *tree);
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struct cache_extent *first_cache_extent(struct cache_tree *tree);
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struct cache_extent *last_cache_extent(struct cache_tree *tree);
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struct cache_extent *prev_cache_extent(struct cache_extent *pe);
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struct cache_extent *next_cache_extent(struct cache_extent *pe);
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/*
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* Find a cache_extent which covers start.
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*
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* If not found, return next cache_extent if possible.
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*/
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struct cache_extent *search_cache_extent(struct cache_tree *tree, u64 start);
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/*
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* Find a cache_extent which restrictly covers start.
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*
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* If not found, return NULL.
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*/
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struct cache_extent *lookup_cache_extent(struct cache_tree *tree,
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u64 start, u64 size);
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/*
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* Add an non-overlap extent into cache tree
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*
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* If [start, start+size) overlap with existing one, it will return -EEXIST.
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*/
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int add_cache_extent(struct cache_tree *tree, u64 start, u64 size);
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/*
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* Same with add_cache_extent, but with cache_extent strcut.
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*/
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int insert_cache_extent(struct cache_tree *tree, struct cache_extent *pe);
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void remove_cache_extent(struct cache_tree *tree, struct cache_extent *pe);
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static inline int cache_tree_empty(struct cache_tree *tree)
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{
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return RB_EMPTY_ROOT(&tree->root);
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}
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typedef void (*free_cache_extent)(struct cache_extent *pe);
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void cache_tree_free_extents(struct cache_tree *tree,
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free_cache_extent free_func);
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#define FREE_EXTENT_CACHE_BASED_TREE(name, free_func) \
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static void free_##name##_tree(struct cache_tree *tree) \
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{ \
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cache_tree_free_extents(tree, free_func); \
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}
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void free_extent_cache_tree(struct cache_tree *tree);
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/*
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* Search a cache_extent with same objectid, and covers start.
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*
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* If not found, return next if possible.
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*/
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struct cache_extent *search_cache_extent2(struct cache_tree *tree,
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u64 objectid, u64 start);
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/*
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* Search a cache_extent with same objectid, and covers the range
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* [start, start + size)
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*
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* If not found, return next cache_extent if possible.
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*/
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struct cache_extent *lookup_cache_extent2(struct cache_tree *tree,
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u64 objectid, u64 start, u64 size);
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int insert_cache_extent2(struct cache_tree *tree, struct cache_extent *pe);
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/*
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* Insert a cache_extent range [start, start + size).
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*
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* This function may merge with existing cache_extent.
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* NOTE: caller must ensure the inserted range won't cover with any existing
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* range.
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*/
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int add_merge_cache_extent(struct cache_tree *tree, u64 start, u64 size);
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#endif
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