函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\mbcache.c Create Date:2022-07-29 11:04:36
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：mb_cache_entry_delete - remove a cache entry*@cache - cache we work with*@key - key*@value - value* Remove entry from cache @cache with key @key and value @value.

函数原型：void mb_cache_entry_delete(struct mb_cache *cache, unsigned int key, u64 value)

返回类型：void

参数：

类型参数名称
struct mb_cache *cache
unsigned intkey
u64value
233  head等于mb_cache_entry_head(cache, key)
234  hlist_bl_lock(head)
236  如果 Key in hash - stable during lifetime of the entry 恒等于key且 User provided value - stable during lifetime of the entry 恒等于value则
238  hlist_bl_del_init( & Hash table list - protected by hash chain bitlock )
239  hlist_bl_unlock(head)
240  加自旋锁
241  如果非链表为空则
242  删除链表项并重新初始化
243  如果非WARN_ONCE(Number of entries in cache == 0, "mbcache: attempt to decrement c_entry_count past zero")则Number of entries in cache 自减
246  atomic_dec( & e_refcnt)
248  自旋锁解锁
249  mb_cache_entry_put(cache, entry)
250  返回
253  hlist_bl_unlock(head)