1 /*
2   File: linux/mbcache.h
3 
4   (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
5 */
6 
7 struct mb_cache_entry {
8 	struct list_head		e_lru_list;
9 	struct mb_cache			*e_cache;
10 	unsigned short			e_used;
11 	unsigned short			e_queued;
12 	struct block_device		*e_bdev;
13 	sector_t			e_block;
14 	struct list_head		e_block_list;
15 	struct {
16 		struct list_head	o_list;
17 		unsigned int		o_key;
18 	} e_index;
19 };
20 
21 struct mb_cache {
22 	struct list_head		c_cache_list;
23 	const char			*c_name;
24 	atomic_t			c_entry_count;
25 	int				c_max_entries;
26 	int				c_bucket_bits;
27 	struct kmem_cache		*c_entry_cache;
28 	struct list_head		*c_block_hash;
29 	struct list_head		*c_index_hash;
30 };
31 
32 /* Functions on caches */
33 
34 struct mb_cache *mb_cache_create(const char *, int);
35 void mb_cache_shrink(struct block_device *);
36 void mb_cache_destroy(struct mb_cache *);
37 
38 /* Functions on cache entries */
39 
40 struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *, gfp_t);
41 int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *,
42 			  sector_t, unsigned int);
43 void mb_cache_entry_release(struct mb_cache_entry *);
44 void mb_cache_entry_free(struct mb_cache_entry *);
45 struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *,
46 					  struct block_device *,
47 					  sector_t);
48 struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
49 						 struct block_device *,
50 						 unsigned int);
51 struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *,
52 						struct block_device *,
53 						unsigned int);
54