mirror of https://gitee.com/openkylin/linux.git
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
#ifndef _LINUX_MBCACHE_H
|
|
#define _LINUX_MBCACHE_H
|
|
|
|
#include <linux/hash.h>
|
|
#include <linux/list_bl.h>
|
|
#include <linux/list.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/fs.h>
|
|
|
|
struct mb_cache;
|
|
|
|
struct mb_cache_entry {
|
|
/* List of entries in cache - protected by cache->c_list_lock */
|
|
struct list_head e_list;
|
|
/* Hash table list - protected by hash chain bitlock */
|
|
struct hlist_bl_node e_hash_list;
|
|
atomic_t e_refcnt;
|
|
/* Key in hash - stable during lifetime of the entry */
|
|
u32 e_key;
|
|
u32 e_referenced:1;
|
|
u32 e_reusable:1;
|
|
/* Block number of hashed block - stable during lifetime of the entry */
|
|
sector_t e_block;
|
|
};
|
|
|
|
struct mb_cache *mb_cache_create(int bucket_bits);
|
|
void mb_cache_destroy(struct mb_cache *cache);
|
|
|
|
int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key,
|
|
sector_t block, bool reusable);
|
|
void __mb_cache_entry_free(struct mb_cache_entry *entry);
|
|
static inline int mb_cache_entry_put(struct mb_cache *cache,
|
|
struct mb_cache_entry *entry)
|
|
{
|
|
if (!atomic_dec_and_test(&entry->e_refcnt))
|
|
return 0;
|
|
__mb_cache_entry_free(entry);
|
|
return 1;
|
|
}
|
|
|
|
void mb_cache_entry_delete_block(struct mb_cache *cache, u32 key,
|
|
sector_t block);
|
|
struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key,
|
|
sector_t block);
|
|
struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
|
|
u32 key);
|
|
struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache *cache,
|
|
struct mb_cache_entry *entry);
|
|
void mb_cache_entry_touch(struct mb_cache *cache,
|
|
struct mb_cache_entry *entry);
|
|
|
|
#endif /* _LINUX_MBCACHE_H */
|