Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
10struct mb_cache;
11
12struct 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
26struct mb_cache *mb_cache_create(int bucket_bits);
27void mb_cache_destroy(struct mb_cache *cache);
28
29int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key,
30 sector_t block, bool reusable);
31void __mb_cache_entry_free(struct mb_cache_entry *entry);
32static 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
41void mb_cache_entry_delete_block(struct mb_cache *cache, u32 key,
42 sector_t block);
43struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key,
44 sector_t block);
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 */