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7a2508e1 JK |
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; | |
15 | /* Hash table list - protected by bitlock in e_hash_list_head */ | |
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; | |
20 | /* Block number of hashed block - stable during lifetime of the entry */ | |
21 | sector_t e_block; | |
22 | /* | |
23 | * Head of hash list (for list bit lock) - stable. Combined with | |
24 | * referenced bit of entry | |
25 | */ | |
26 | unsigned long _e_hash_list_head; | |
27 | }; | |
28 | ||
29 | struct mb_cache *mb_cache_create(int bucket_bits); | |
30 | void mb_cache_destroy(struct mb_cache *cache); | |
31 | ||
32 | int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key, | |
33 | sector_t block); | |
34 | void __mb_cache_entry_free(struct mb_cache_entry *entry); | |
35 | static inline int mb_cache_entry_put(struct mb_cache *cache, | |
36 | struct mb_cache_entry *entry) | |
37 | { | |
38 | if (!atomic_dec_and_test(&entry->e_refcnt)) | |
39 | return 0; | |
40 | __mb_cache_entry_free(entry); | |
41 | return 1; | |
42 | } | |
43 | ||
44 | void mb_cache_entry_delete_block(struct mb_cache *cache, u32 key, | |
45 | sector_t block); | |
46 | struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, | |
47 | u32 key); | |
48 | struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache *cache, | |
49 | struct mb_cache_entry *entry); | |
50 | void mb_cache_entry_touch(struct mb_cache *cache, | |
51 | struct mb_cache_entry *entry); | |
52 | ||
53 | #endif /* _LINUX_MBCACHE_H */ |