include/linux/mbcache.h

   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);