mirror of
https://github.com/smaeul/u-boot.git
synced 2025-10-25 01:58:13 +01:00
ab5c3046f2
This patch implements an infrastructure to insert/search/merge an extent range (with variable length). This provides the basis for later extent buffer cache used in btrfs. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Marek Behún <marek.behun@nic.cz>
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
|
|
/*
|
|
* Crossported from the same named file of btrfs-progs.
|
|
*
|
|
* Minor modification to include headers.
|
|
*/
|
|
#ifndef __BTRFS_EXTENT_CACHE_H__
|
|
#define __BTRFS_EXTENT_CACHE_H__
|
|
|
|
#include <linux/rbtree.h>
|
|
#include <linux/types.h>
|
|
|
|
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
|