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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 *, gfp_t); |
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 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 *, gfp_t); |
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 |
53 |
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