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