root/include/linux/mbcache.h

INCLUDED FROM

/*
  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 list_head                e_lru_list;
        struct mb_cache                 *e_cache;
        unsigned short                  e_used;
        unsigned short                  e_queued;
        struct block_device             *e_bdev;
        sector_t                        e_block;
        struct list_head                e_block_list;
        struct {
                struct list_head        o_list;
                unsigned int            o_key;
        } e_indexes[0];
};

struct mb_cache_op {
        int (*free)(struct mb_cache_entry *, gfp_t);
};

/* Functions on caches */

struct mb_cache * mb_cache_create(const char *, struct mb_cache_op *, size_t,
                                  int, 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);
#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