mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git
synced 2024-11-15 00:04:23 +08:00
94fced6353
Include the files by full path to avoid any confusion in case of potentially duplicate names. Signed-off-by: David Sterba <dsterba@suse.com>
120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#ifndef __BTRFS_EXTENT_CACHE_H__
|
|
#define __BTRFS_EXTENT_CACHE_H__
|
|
|
|
#if BTRFS_FLAT_INCLUDES
|
|
#include "kerncompat.h"
|
|
#include "kernel-lib/rbtree.h"
|
|
#else
|
|
#include <btrfs/kerncompat.h>
|
|
#include <btrfs/rbtree.h>
|
|
#endif /* BTRFS_FLAT_INCLUDES */
|
|
|
|
struct cache_tree {
|
|
struct rb_root root;
|
|
};
|
|
|
|
struct cache_extent {
|
|
struct rb_node rb_node;
|
|
u64 objectid;
|
|
u64 start;
|
|
u64 size;
|
|
};
|
|
|
|
void cache_tree_init(struct cache_tree *tree);
|
|
|
|
struct cache_extent *first_cache_extent(struct cache_tree *tree);
|
|
struct cache_extent *last_cache_extent(struct cache_tree *tree);
|
|
struct cache_extent *prev_cache_extent(struct cache_extent *pe);
|
|
struct cache_extent *next_cache_extent(struct cache_extent *pe);
|
|
|
|
/*
|
|
* Find a cache_extent which covers start.
|
|
*
|
|
* If not found, return next cache_extent if possible.
|
|
*/
|
|
struct cache_extent *search_cache_extent(struct cache_tree *tree, u64 start);
|
|
|
|
/*
|
|
* Find a cache_extent which restrictly covers start.
|
|
*
|
|
* If not found, return NULL.
|
|
*/
|
|
struct cache_extent *lookup_cache_extent(struct cache_tree *tree,
|
|
u64 start, u64 size);
|
|
|
|
/*
|
|
* Add an non-overlap extent into cache tree
|
|
*
|
|
* If [start, start+size) overlap with existing one, it will return -EEXIST.
|
|
*/
|
|
int add_cache_extent(struct cache_tree *tree, u64 start, u64 size);
|
|
|
|
/*
|
|
* Same with add_cache_extent, but with cache_extent strcut.
|
|
*/
|
|
int insert_cache_extent(struct cache_tree *tree, struct cache_extent *pe);
|
|
void remove_cache_extent(struct cache_tree *tree, struct cache_extent *pe);
|
|
|
|
static inline int cache_tree_empty(struct cache_tree *tree)
|
|
{
|
|
return RB_EMPTY_ROOT(&tree->root);
|
|
}
|
|
|
|
typedef void (*free_cache_extent)(struct cache_extent *pe);
|
|
|
|
void cache_tree_free_extents(struct cache_tree *tree,
|
|
free_cache_extent free_func);
|
|
|
|
#define FREE_EXTENT_CACHE_BASED_TREE(name, free_func) \
|
|
static void free_##name##_tree(struct cache_tree *tree) \
|
|
{ \
|
|
cache_tree_free_extents(tree, free_func); \
|
|
}
|
|
|
|
void free_extent_cache_tree(struct cache_tree *tree);
|
|
|
|
/*
|
|
* Search a cache_extent with same objectid, and covers start.
|
|
*
|
|
* If not found, return next if possible.
|
|
*/
|
|
struct cache_extent *search_cache_extent2(struct cache_tree *tree,
|
|
u64 objectid, u64 start);
|
|
/*
|
|
* Search a cache_extent with same objectid, and covers the range
|
|
* [start, start + size)
|
|
*
|
|
* If not found, return next cache_extent if possible.
|
|
*/
|
|
struct cache_extent *lookup_cache_extent2(struct cache_tree *tree,
|
|
u64 objectid, u64 start, u64 size);
|
|
int insert_cache_extent2(struct cache_tree *tree, struct cache_extent *pe);
|
|
|
|
/*
|
|
* Insert a cache_extent range [start, start + size).
|
|
*
|
|
* This function may merge with existing cache_extent.
|
|
* NOTE: caller must ensure the inserted range won't cover with any existing
|
|
* range.
|
|
*/
|
|
int add_merge_cache_extent(struct cache_tree *tree, u64 start, u64 size);
|
|
#endif
|