#ifndef _LINUX_MB2CACHE_H #define _LINUX_MB2CACHE_H #include #include #include #include #include struct mb2_cache; struct mb2_cache_entry { /* LRU list - protected by cache->c_lru_list_lock */ struct list_head e_lru_list; /* Hash table list - protected by bitlock in e_hash_list_head */ struct hlist_bl_node e_hash_list; atomic_t e_refcnt; /* Key in hash - stable during lifetime of the entry */ u32 e_key; /* Block number of hashed block - stable during lifetime of the entry */ sector_t e_block; /* Head of hash list (for list bit lock) - stable */ struct hlist_bl_head *e_hash_list_head; }; struct mb2_cache *mb2_cache_create(int bucket_bits); void mb2_cache_destroy(struct mb2_cache *cache); int mb2_cache_entry_create(struct mb2_cache *cache, gfp_t mask, u32 key, sector_t block); void __mb2_cache_entry_free(struct mb2_cache_entry *entry); static inline int mb2_cache_entry_put(struct mb2_cache *cache, struct mb2_cache_entry *entry) { if (!atomic_dec_and_test(&entry->e_refcnt)) return 0; __mb2_cache_entry_free(entry); return 1; } void mb2_cache_entry_delete_block(struct mb2_cache *cache, u32 key, sector_t block); struct mb2_cache_entry *mb2_cache_entry_find_first(struct mb2_cache *cache, u32 key); struct mb2_cache_entry *mb2_cache_entry_find_next(struct mb2_cache *cache, struct mb2_cache_entry *entry); void mb2_cache_entry_touch(struct mb2_cache *cache, struct mb2_cache_entry *entry); #endif /* _LINUX_MB2CACHE_H */