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52 lines
1.6 KiB
52 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_MBCACHE_H |
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#define _LINUX_MBCACHE_H |
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#include <linux/hash.h> |
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#include <linux/list_bl.h> |
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#include <linux/list.h> |
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#include <linux/atomic.h> |
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#include <linux/fs.h> |
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struct mb_cache; |
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struct mb_cache_entry { |
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/* List of entries in cache - protected by cache->c_list_lock */ |
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struct list_head e_list; |
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/* Hash table list - protected by hash chain bitlock */ |
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struct hlist_bl_node e_hash_list; |
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atomic_t e_refcnt; |
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/* Key in hash - stable during lifetime of the entry */ |
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u32 e_key; |
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u32 e_referenced:1; |
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u32 e_reusable:1; |
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/* User provided value - stable during lifetime of the entry */ |
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u64 e_value; |
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}; |
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struct mb_cache *mb_cache_create(int bucket_bits); |
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void mb_cache_destroy(struct mb_cache *cache); |
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int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key, |
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u64 value, bool reusable); |
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void __mb_cache_entry_free(struct mb_cache_entry *entry); |
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static inline int mb_cache_entry_put(struct mb_cache *cache, |
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struct mb_cache_entry *entry) |
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{ |
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if (!atomic_dec_and_test(&entry->e_refcnt)) |
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return 0; |
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__mb_cache_entry_free(entry); |
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return 1; |
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} |
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void mb_cache_entry_delete(struct mb_cache *cache, u32 key, u64 value); |
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struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key, |
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u64 value); |
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struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, |
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u32 key); |
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struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache *cache, |
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struct mb_cache_entry *entry); |
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void mb_cache_entry_touch(struct mb_cache *cache, |
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struct mb_cache_entry *entry); |
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#endif /* _LINUX_MBCACHE_H */
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