mbcache.h (1607B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _LINUX_MBCACHE_H 3#define _LINUX_MBCACHE_H 4 5#include <linux/hash.h> 6#include <linux/list_bl.h> 7#include <linux/list.h> 8#include <linux/atomic.h> 9#include <linux/fs.h> 10 11struct mb_cache; 12 13struct mb_cache_entry { 14 /* List of entries in cache - protected by cache->c_list_lock */ 15 struct list_head e_list; 16 /* Hash table list - protected by hash chain bitlock */ 17 struct hlist_bl_node e_hash_list; 18 atomic_t e_refcnt; 19 /* Key in hash - stable during lifetime of the entry */ 20 u32 e_key; 21 u32 e_referenced:1; 22 u32 e_reusable:1; 23 /* User provided value - stable during lifetime of the entry */ 24 u64 e_value; 25}; 26 27struct mb_cache *mb_cache_create(int bucket_bits); 28void mb_cache_destroy(struct mb_cache *cache); 29 30int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key, 31 u64 value, bool reusable); 32void __mb_cache_entry_free(struct mb_cache_entry *entry); 33static inline int mb_cache_entry_put(struct mb_cache *cache, 34 struct mb_cache_entry *entry) 35{ 36 if (!atomic_dec_and_test(&entry->e_refcnt)) 37 return 0; 38 __mb_cache_entry_free(entry); 39 return 1; 40} 41 42void mb_cache_entry_delete(struct mb_cache *cache, u32 key, u64 value); 43struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key, 44 u64 value); 45struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, 46 u32 key); 47struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache *cache, 48 struct mb_cache_entry *entry); 49void mb_cache_entry_touch(struct mb_cache *cache, 50 struct mb_cache_entry *entry); 51 52#endif /* _LINUX_MBCACHE_H */