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 hash chain bitlock */ 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 u32 e_referenced:1; 21 u32 e_reusable:1; 22 /* Block number of hashed block - stable during lifetime of the entry */ 23 sector_t e_block; 24 }; 25 26 struct mb_cache *mb_cache_create(int bucket_bits); 27 void mb_cache_destroy(struct mb_cache *cache); 28 29 int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key, 30 sector_t block, bool reusable); 31 void __mb_cache_entry_free(struct mb_cache_entry *entry); 32 static inline int mb_cache_entry_put(struct mb_cache *cache, 33 struct mb_cache_entry *entry) 34 { 35 if (!atomic_dec_and_test(&entry->e_refcnt)) 36 return 0; 37 __mb_cache_entry_free(entry); 38 return 1; 39 } 40 41 void mb_cache_entry_delete_block(struct mb_cache *cache, u32 key, 42 sector_t block); 43 struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key, 44 sector_t block); 45 struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, 46 u32 key); 47 struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache *cache, 48 struct mb_cache_entry *entry); 49 void mb_cache_entry_touch(struct mb_cache *cache, 50 struct mb_cache_entry *entry); 51 52 #endif /* _LINUX_MBCACHE_H */ 53