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/*
File: linux/mbcache.h
(C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/
/* Hardwire the number of additional indexes */
#define MB_CACHE_INDEXES_COUNT 1
struct mb_cache_entry;
struct mb_cache_op {
int (*free)(struct mb_cache_entry *, int);
};
struct mb_cache {
struct list_head c_cache_list;
const char *c_name;
struct mb_cache_op c_op;
atomic_t c_entry_count;
int c_bucket_bits;
#ifndef MB_CACHE_INDEXES_COUNT
int c_indexes_count;
#endif
kmem_cache_t *c_entry_cache;
struct list_head *c_block_hash;
struct list_head *c_indexes_hash[0];
};
struct mb_cache_entry_index {
struct list_head o_list;
unsigned int o_key;
};
struct mb_cache_entry {
struct list_head e_lru_list;
struct mb_cache *e_cache;
atomic_t e_used;
struct block_device *e_bdev;
sector_t e_block;
struct list_head e_block_list;
struct mb_cache_entry_index e_indexes[0];
};
/* Functions on caches */
struct mb_cache * mb_cache_create(const char *, struct mb_cache_op *, size_t,
int, int);
void mb_cache_shrink(struct mb_cache *, struct block_device *);
void mb_cache_destroy(struct mb_cache *);
/* Functions on cache entries */
struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *);
int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *,
sector_t, unsigned int[]);
void mb_cache_entry_rehash(struct mb_cache_entry *, unsigned int[]);
void mb_cache_entry_release(struct mb_cache_entry *);
void mb_cache_entry_takeout(struct mb_cache_entry *);
void mb_cache_entry_free(struct mb_cache_entry *);
struct mb_cache_entry *mb_cache_entry_dup(struct mb_cache_entry *);
struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *,
struct block_device *,
sector_t);
#if !defined(MB_CACHE_INDEXES_COUNT) || (MB_CACHE_INDEXES_COUNT > 0)
struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, int,
struct block_device *,
unsigned int);
struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *, int,
struct block_device *,
unsigned int);
#endif