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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273/* SPDX-License-Identifier: GPL-2.0 */#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;
/* Cache entry flags */enum { MBE_REFERENCED_B = 0, MBE_REUSABLE_B};
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. The entry is * guaranteed to be hashed while e_refcnt > 0. */ struct hlist_bl_node e_hash_list; /* * Entry refcount. Once it reaches zero, entry is unhashed and freed. * While refcount > 0, the entry is guaranteed to stay in the hash and * e.g. mb_cache_entry_try_delete() will fail. */ atomic_t e_refcnt; /* Key in hash - stable during lifetime of the entry */ u32 e_key; unsigned long e_flags; /* User provided value - stable during lifetime of the entry */ u64 e_value;};
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, u64 value, bool reusable);void __mb_cache_entry_free(struct mb_cache *cache, struct mb_cache_entry *entry);void mb_cache_entry_wait_unused(struct mb_cache_entry *entry);static inline void mb_cache_entry_put(struct mb_cache *cache, struct mb_cache_entry *entry){ unsigned int cnt = atomic_dec_return(&entry->e_refcnt);
if (cnt > 0) { if (cnt <= 2) wake_up_var(&entry->e_refcnt); return; } __mb_cache_entry_free(cache, entry);}
struct mb_cache_entry *mb_cache_entry_delete_or_get(struct mb_cache *cache, u32 key, u64 value);struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key, u64 value);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 */