root/include/linux/mbcache.h

/*
  File: linux/mbcache.h

  (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/
struct mb_cache_entry {
        struct list_head                e_lru_list;
        struct mb_cache                 *e_cache;
        unsigned short                  e_used;
        unsigned short                  e_queued;
        atomic_t                        e_refcnt;
        struct block_device             *e_bdev;
        sector_t                        e_block;
        struct hlist_bl_node            e_block_list;
        struct {
                struct hlist_bl_node    o_list;
                unsigned int            o_key;
        } e_index;
        struct hlist_bl_head            *e_block_hash_p;
        struct hlist_bl_head            *e_index_hash_p;
};

struct mb_cache {
        struct list_head                c_cache_list;
        const char                      *c_name;
        atomic_t                        c_entry_count;
        int                             c_max_entries;
        int                             c_bucket_bits;
        struct kmem_cache               *c_entry_cache;
        struct hlist_bl_head            *c_block_hash;
        struct hlist_bl_head            *c_index_hash;
};

/* Functions on caches */

struct mb_cache *mb_cache_create(const char *, int);
void mb_cache_shrink(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 *, gfp_t);
int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *,
                          sector_t, unsigned int);
void mb_cache_entry_release(struct mb_cache_entry *);
void mb_cache_entry_free(struct mb_cache_entry *);
struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *,
                                          struct block_device *,
                                          sector_t);
struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
                                                 struct block_device *, 
                                                 unsigned int);
struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *,
                                                struct block_device *, 
                                                unsigned int);