blk_add_timer

Name: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.

Proto:void blk_add_timer(struct request *req)

Type:void

Parameter:

Type	Parameter	Name
struct request *	req

114

q = q

121

If Not timeout Then timeout = rq_timeout

124

rq_flags &= ~->timeout has been called, don't expire again

126

expiry = jiffies + timeout

127

WRITE_ONCE(deadline, expiry)

134

expiry = 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

If Not 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 || time_before(expiry, expires) Then

138

diff = expires - expiry

147

If Not 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 || diff >= HZ / 2 Then 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,

**Caller**
Name	Describe
blk_mq_start_request
blk_mq_rq_timed_out

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