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Diffstat (limited to 'ubuntu/dm-raid4-5/dm-memcache.h')
-rw-r--r-- | ubuntu/dm-raid4-5/dm-memcache.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/ubuntu/dm-raid4-5/dm-memcache.h b/ubuntu/dm-raid4-5/dm-memcache.h new file mode 100644 index 000000000000..87e4256daf5d --- /dev/null +++ b/ubuntu/dm-raid4-5/dm-memcache.h @@ -0,0 +1,68 @@ +/* + * 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 |