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/*
* Copyright (C) 2006-2008 Red Hat, Inc. All rights reserved.
*
* Module Author: Heinz Mauelshagen <Mauelshagen@RedHat.com>
*
* Device-mapper memory object handling:
*
* o allocate/free total_pages in a per client page pool.
*
* o allocate/free memory objects with chunks (1..n) of
* pages_per_chunk pages hanging off.
*
* This file is released under the GPL.
*/
#ifndef _DM_MEM_CACHE_H
#define _DM_MEM_CACHE_H
#define DM_MEM_CACHE_H_VERSION "0.1"
#include "dm.h"
#include <linux/dm-io.h>
static inline struct page_list *pl_elem(struct page_list *pl, unsigned p)
{
while (pl && p--)
pl = pl->next;
return pl;
}
struct dm_mem_cache_object {
struct page_list *pl; /* Dynamically allocated array */
void *private; /* Caller context reference */
};
struct dm_mem_cache_client;
/*
* Create/destroy dm memory cache client resources.
*
* On creation, a number of @objects with @chunks of
* @pages_per_chunk pages will be allocated.
*/
struct dm_mem_cache_client *
dm_mem_cache_client_create(unsigned objects, unsigned chunks,
unsigned pages_per_chunk);
void dm_mem_cache_client_destroy(struct dm_mem_cache_client *client);
/*
* Grow/shrink a dm memory cache client resources
* by @objetcs amount of objects.
*/
int dm_mem_cache_grow(struct dm_mem_cache_client *client, unsigned objects);
int dm_mem_cache_shrink(struct dm_mem_cache_client *client, unsigned objects);
/*
* Allocate/free a memory object
*
* On allocation one object with an amount of chunks and
* an amount of pages per chunk will be returned on success.
*/
struct dm_mem_cache_object *
dm_mem_cache_alloc(struct dm_mem_cache_client *client);
void dm_mem_cache_free(struct dm_mem_cache_client *client,
struct dm_mem_cache_object *object);
#endif
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