[linux-2.6-block.git] / include / linux / mbcache2.h

#ifndef _LINUX_MB2CACHE_H
#define _LINUX_MB2CACHE_H

#include <linux/hash.h>
#include <linux/list_bl.h>
#include <linux/list.h>
#include <linux/atomic.h>
#include <linux/fs.h>

struct mb2_cache;

struct mb2_cache_entry {
	/* List of entries in cache - protected by cache->c_list_lock */
	struct list_head	e_list;
	/* Hash table list - protected by bitlock in e_hash_list_head */
	struct hlist_bl_node	e_hash_list;
	atomic_t		e_refcnt;
	/* Key in hash - stable during lifetime of the entry */
	u32			e_key;
	/* Block number of hashed block - stable during lifetime of the entry */
	sector_t		e_block;
	/*
	 * Head of hash list (for list bit lock) - stable. Combined with
	 * referenced bit of entry
	 */
	unsigned long		_e_hash_list_head;
};

struct mb2_cache *mb2_cache_create(int bucket_bits);
void mb2_cache_destroy(struct mb2_cache *cache);

int mb2_cache_entry_create(struct mb2_cache *cache, gfp_t mask, u32 key,
			   sector_t block);
void __mb2_cache_entry_free(struct mb2_cache_entry *entry);
static inline int mb2_cache_entry_put(struct mb2_cache *cache,
				      struct mb2_cache_entry *entry)
{
	if (!atomic_dec_and_test(&entry->e_refcnt))
		return 0;
	__mb2_cache_entry_free(entry);
	return 1;
}

void mb2_cache_entry_delete_block(struct mb2_cache *cache, u32 key,
				  sector_t block);
struct mb2_cache_entry *mb2_cache_entry_find_first(struct mb2_cache *cache,
						   u32 key);
struct mb2_cache_entry *mb2_cache_entry_find_next(struct mb2_cache *cache,
						  struct mb2_cache_entry *entry);
void mb2_cache_entry_touch(struct mb2_cache *cache,
			   struct mb2_cache_entry *entry);

#endif	/* _LINUX_MB2CACHE_H */
Commit	Line	Data
f9a61eb4 JK	1	#ifndef _LINUX_MB2CACHE_H
	2	#define _LINUX_MB2CACHE_H
	3
	4	#include <linux/hash.h>
	5	#include <linux/list_bl.h>
	6	#include <linux/list.h>
	7	#include <linux/atomic.h>
	8	#include <linux/fs.h>
	9
	10	struct mb2_cache;
	11
	12	struct mb2_cache_entry {
f0c8b462 JK	13	/* List of entries in cache - protected by cache->c_list_lock */
f0c8b462 JK	14	struct list_head e_list;
f9a61eb4 JK	15	/* Hash table list - protected by bitlock in e_hash_list_head */
	16	struct hlist_bl_node e_hash_list;
	17	atomic_t e_refcnt;
	18	/* Key in hash - stable during lifetime of the entry */
	19	u32 e_key;
	20	/* Block number of hashed block - stable during lifetime of the entry */
	21	sector_t e_block;
f0c8b462 JK	22	/*
	23	* Head of hash list (for list bit lock) - stable. Combined with
	24	* referenced bit of entry
	25	*/
	26	unsigned long _e_hash_list_head;
f9a61eb4 JK	27	};
	28
	29	struct mb2_cache *mb2_cache_create(int bucket_bits);
	30	void mb2_cache_destroy(struct mb2_cache *cache);
	31
	32	int mb2_cache_entry_create(struct mb2_cache *cache, gfp_t mask, u32 key,
	33	sector_t block);
	34	void __mb2_cache_entry_free(struct mb2_cache_entry *entry);
	35	static inline int mb2_cache_entry_put(struct mb2_cache *cache,
	36	struct mb2_cache_entry *entry)
	37	{
	38	if (!atomic_dec_and_test(&entry->e_refcnt))
	39	return 0;
	40	__mb2_cache_entry_free(entry);
	41	return 1;
	42	}
	43
	44	void mb2_cache_entry_delete_block(struct mb2_cache *cache, u32 key,
	45	sector_t block);
	46	struct mb2_cache_entry mb2_cache_entry_find_first(struct mb2_cache cache,
	47	u32 key);
	48	struct mb2_cache_entry mb2_cache_entry_find_next(struct mb2_cache cache,
	49	struct mb2_cache_entry *entry);
	50	void mb2_cache_entry_touch(struct mb2_cache *cache,
	51	struct mb2_cache_entry *entry);
	52
	53	#endif /* _LINUX_MB2CACHE_H */