mbcache.h 1.5 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152
  1. /*
  2. File: linux/mbcache.h
  3. (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
  4. */
  5. /* Hardwire the number of additional indexes */
  6. #define MB_CACHE_INDEXES_COUNT 1
  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_indexes[0];
  19. };
  20. struct mb_cache_op {
  21. int (*free)(struct mb_cache_entry *, gfp_t);
  22. };
  23. /* Functions on caches */
  24. struct mb_cache * mb_cache_create(const char *, struct mb_cache_op *, size_t,
  25. int, int);
  26. void mb_cache_shrink(struct block_device *);
  27. void mb_cache_destroy(struct mb_cache *);
  28. /* Functions on cache entries */
  29. struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *);
  30. int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *,
  31. sector_t, unsigned int[]);
  32. void mb_cache_entry_release(struct mb_cache_entry *);
  33. void mb_cache_entry_free(struct mb_cache_entry *);
  34. struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *,
  35. struct block_device *,
  36. sector_t);
  37. #if !defined(MB_CACHE_INDEXES_COUNT) || (MB_CACHE_INDEXES_COUNT > 0)
  38. struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, int,
  39. struct block_device *,
  40. unsigned int);
  41. struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *, int,
  42. struct block_device *,
  43. unsigned int);
  44. #endif