1 #ifndef _LINUX_MB2CACHE_H
2 #define _LINUX_MB2CACHE_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 mb2_cache;
11
12 struct mb2_cache_entry {
13 /* LRU list - protected by cache->c_lru_list_lock */
14 struct list_head e_lru_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 /* Head of hash list (for list bit lock) - stable */
23 struct hlist_bl_head *e_hash_list_head;
24 };
25
26 struct mb2_cache *mb2_cache_create(int bucket_bits);
27 void mb2_cache_destroy(struct mb2_cache *cache);
28
29 int mb2_cache_entry_create(struct mb2_cache *cache, gfp_t mask, u32 key,
30 sector_t block);
31 void __mb2_cache_entry_free(struct mb2_cache_entry *entry);
mb2_cache_entry_put(struct mb2_cache * cache,struct mb2_cache_entry * entry)32 static inline int mb2_cache_entry_put(struct mb2_cache *cache,
33 struct mb2_cache_entry *entry)
34 {
35 if (!atomic_dec_and_test(&entry->e_refcnt))
36 return 0;
37 __mb2_cache_entry_free(entry);
38 return 1;
39 }
40
41 void mb2_cache_entry_delete_block(struct mb2_cache *cache, u32 key,
42 sector_t block);
43 struct mb2_cache_entry *mb2_cache_entry_find_first(struct mb2_cache *cache,
44 u32 key);
45 struct mb2_cache_entry *mb2_cache_entry_find_next(struct mb2_cache *cache,
46 struct mb2_cache_entry *entry);
47 void mb2_cache_entry_touch(struct mb2_cache *cache,
48 struct mb2_cache_entry *entry);
49
50 #endif /* _LINUX_MB2CACHE_H */
51