函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:block\blk-cgroup.c Create Date:2022-07-27 19:14:55
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：blkg_lookup_slowpath

函数原型：struct blkcg_gq *blkg_lookup_slowpath(struct blkcg *blkcg, struct request_queue *q, bool update_hint)

返回类型：struct blkcg_gq

参数：

类型参数名称
struct blkcg *blkcg
struct request_queue *q
boolupdate_hint
208  blkg等于adix_tree_lookup - perform lookup operation on a radix tree*@root: radix tree root*@index: index key* Lookup the item at the position @index in the radix tree @root.* This function can be called under rcu_read_lock, however the caller
209  如果blkg且 Pointer to the associated request_queue 恒等于q则
210  如果update_hint则
211  lockdep_assert_held( & queue_lock)
212  cu_assign_pointer() - assign to RCU-protected pointer*@p: pointer to assign to*@v: value to assign (publish)* Assigns the specified value to the specified RCU-protected* pointer, ensuring that any concurrent RCU readers will see* any prior initialization(blkg_hint, blkg)
214  返回:blkg
217  返回:NULL