blk_add_timer

函数名称：lk_add_timer - Start timeout timer for a single request*@req: request that is about to start running.* Notes:* Each request has its own timer, and as it is added to the queue, we* set up the timer. When the request completes, we cancel the timer.

函数原型：void blk_add_timer(struct request *req)

返回类型：void

参数：

类型	参数	名称
struct request *	req

114

q等于q

121

如果非timeout则timeout等于rq_timeout

124

rq_flags与等于->timeout has been called, don't expire again 的反

126

expiry等于jiffies加timeout

127

WRITE_ONCE(deadline, expiry)

134

expiry等于blk_rq_timeout(d_jiffies_up - function to round jiffies up to a full second*@j: the time in (absolute) jiffies that should be rounded* This is the same as round_jiffies() except that it will never* round down)

136

如果非mer_pending - is a timer pending?*@timer: the timer in question* timer_pending will tell whether a given timer is currently pending,* or not. Callers must ensure serialization wrt. other operations done* to this timer, eg或time_before(expiry, expires)则

138

diff等于expires减expiry

147

如果非mer_pending - is a timer pending?*@timer: the timer in question* timer_pending will tell whether a given timer is currently pending,* or not. Callers must ensure serialization wrt. other operations done* to this timer, eg或diff大于等于HZ除2则mod_timer - modify a timer's timeout*@timer: the timer to be modified*@expires: new timeout in jiffies* mod_timer() is a more efficient way to update the expire field of an* active timer (if the timer is inactive it will be activated)* mod_timer(timer,

**调用者**
名称	描述
blk_mq_start_request
blk_mq_rq_timed_out

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码