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1 | #ifndef _LINUX_MBCACHE_H |
2 | #define _LINUX_MBCACHE_H | |
3 | ||
4 | #include <linux/hash.h> | |
5 | #include <linux/list_bl.h> | |
6 | #include <linux/list.h> | |
7 | #include <linux/atomic.h> | |
8 | #include <linux/fs.h> | |
9 | ||
10 | struct mb_cache; | |
11 | ||
12 | struct mb_cache_entry { | |
13 | /* List of entries in cache - protected by cache->c_list_lock */ | |
14 | struct list_head e_list; | |
dc8d5e56 | 15 | /* Hash table list - protected by hash chain bitlock */ |
7a2508e1 JK |
16 | struct hlist_bl_node e_hash_list; |
17 | atomic_t e_refcnt; | |
18 | /* Key in hash - stable during lifetime of the entry */ | |
19 | u32 e_key; | |
dc8d5e56 | 20 | u32 e_referenced:1; |
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21 | /* Block number of hashed block - stable during lifetime of the entry */ |
22 | sector_t e_block; | |
7a2508e1 JK |
23 | }; |
24 | ||
25 | struct mb_cache *mb_cache_create(int bucket_bits); | |
26 | void mb_cache_destroy(struct mb_cache *cache); | |
27 | ||
28 | int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key, | |
29 | sector_t block); | |
30 | void __mb_cache_entry_free(struct mb_cache_entry *entry); | |
31 | static inline int mb_cache_entry_put(struct mb_cache *cache, | |
32 | struct mb_cache_entry *entry) | |
33 | { | |
34 | if (!atomic_dec_and_test(&entry->e_refcnt)) | |
35 | return 0; | |
36 | __mb_cache_entry_free(entry); | |
37 | return 1; | |
38 | } | |
39 | ||
40 | void mb_cache_entry_delete_block(struct mb_cache *cache, u32 key, | |
41 | sector_t block); | |
42 | struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, | |
43 | u32 key); | |
44 | struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache *cache, | |
45 | struct mb_cache_entry *entry); | |
46 | void mb_cache_entry_touch(struct mb_cache *cache, | |
47 | struct mb_cache_entry *entry); | |
48 | ||
49 | #endif /* _LINUX_MBCACHE_H */ |