| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | File: linux/mbcache.h |
| 3 | |
| 4 | (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| 5 | */ |
| 6 | |
| 7 | /* Hardwire the number of additional indexes */ |
| 8 | #define MB_CACHE_INDEXES_COUNT 1 |
| 9 | |
| 10 | struct mb_cache_entry { |
| 11 | struct list_head e_lru_list; |
| 12 | struct mb_cache *e_cache; |
| 13 | unsigned short e_used; |
| 14 | unsigned short e_queued; |
| 15 | struct block_device *e_bdev; |
| 16 | sector_t e_block; |
| 17 | struct list_head e_block_list; |
| 18 | struct { |
| 19 | struct list_head o_list; |
| 20 | unsigned int o_key; |
| 21 | } e_indexes[0]; |
| 22 | }; |
| 23 | |
| 24 | struct mb_cache_op { |
| 25 | int (*free)(struct mb_cache_entry *, int); |
| 26 | }; |
| 27 | |
| 28 | /* Functions on caches */ |
| 29 | |
| 30 | struct mb_cache * mb_cache_create(const char *, struct mb_cache_op *, size_t, |
| 31 | int, int); |
| 32 | void mb_cache_shrink(struct mb_cache *, struct block_device *); |
| 33 | void mb_cache_destroy(struct mb_cache *); |
| 34 | |
| 35 | /* Functions on cache entries */ |
| 36 | |
| 37 | struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *); |
| 38 | int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *, |
| 39 | sector_t, unsigned int[]); |
| 40 | void mb_cache_entry_release(struct mb_cache_entry *); |
| 41 | void mb_cache_entry_free(struct mb_cache_entry *); |
| 42 | struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *, |
| 43 | struct block_device *, |
| 44 | sector_t); |
| 45 | #if !defined(MB_CACHE_INDEXES_COUNT) || (MB_CACHE_INDEXES_COUNT > 0) |
| 46 | struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, int, |
| 47 | struct block_device *, |
| 48 | unsigned int); |
| 49 | struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *, int, |
| 50 | struct block_device *, |
| 51 | unsigned int); |
| 52 | #endif |