51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
|
#ifndef _LINUX_MB2CACHE_H
|
||
|
|
#define _LINUX_MB2CACHE_H
|
||
|
|
|
||
|
|
#include <linux/hash.h>
|
||
|
|
#include <linux/list_bl.h>
|
||
|
|
#include <linux/list.h>
|
||
|
|
#include <linux/atomic.h>
|
||
|
|
#include <linux/fs.h>
|
||
|
|
|
||
|
|
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 */
|