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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
7a2508e1 JK |
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 | ||
11 | struct mb_cache; | |
12 | ||
13 | struct mb_cache_entry { | |
14 | /* List of entries in cache - protected by cache->c_list_lock */ | |
15 | struct list_head e_list; | |
dc8d5e56 | 16 | /* Hash table list - protected by hash chain bitlock */ |
7a2508e1 JK |
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; | |
dc8d5e56 | 21 | u32 e_referenced:1; |
6048c64b | 22 | u32 e_reusable:1; |
c07dfcb4 TE |
23 | /* User provided value - stable during lifetime of the entry */ |
24 | u64 e_value; | |
7a2508e1 JK |
25 | }; |
26 | ||
27 | struct mb_cache *mb_cache_create(int bucket_bits); | |
28 | void mb_cache_destroy(struct mb_cache *cache); | |
29 | ||
30 | int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key, | |
c07dfcb4 | 31 | u64 value, bool reusable); |
7a2508e1 JK |
32 | void __mb_cache_entry_free(struct mb_cache_entry *entry); |
33 | static 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 | ||
c07dfcb4 | 42 | void mb_cache_entry_delete(struct mb_cache *cache, u32 key, u64 value); |
6048c64b | 43 | struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key, |
c07dfcb4 | 44 | u64 value); |
7a2508e1 JK |
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 */ |