/**
* blk_execute_rq_nowait - insert a request into queue for execution
* @q: queue to insert the request in
* @bd_disk: matching gendisk
* @rq: request to insert
* @at_head: insert request at head or tail of queue
* @done: I/O completion handler
*
* Description:
* Insert a fully prepared request at the back of the I/O scheduler queue
* for execution. Don't wait for completion.
*
* Note:
* This function will invoke @done directly if the queue is dead
*/
void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
struct request *rq, int at_head,
rq_end_io_fn *done)
{
int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK;
WARN_ON(irqs_disabled());
rq->rq_disk = bd_disk;
rq->end_io = done;
spin_lock_irq(q->queue_lock);
if (unlikely(blk_queue_dead(q))) {
rq->cmd_flags |= REQ_QUIET;
rq->errors = -ENXIO;
__blk_end_request_all(rq, rq->errors);
spin_unlock_irq(q->queue_lock);
return;
}
__elv_add_request(q, rq, where, 1);
__generic_unplug_device(q);
/* the queue is stopped so it won't be plugged+unplugged */
if (rq->cmd_type == REQ_TYPE_PM_RESUME)
q->request_fn(q);
spin_unlock_irq(q->queue_lock);
}
/**
* blk_execute_rq_nowait - insert a request into queue for execution
* @q: queue to insert the request in
* @bd_disk: matching gendisk
* @rq: request to insert
* @at_head: insert request at head or tail of queue
* @done: I/O completion handler
*
* Description:
* Insert a fully prepared request at the back of the I/O scheduler queue
* for execution. Don't wait for completion.
*/
void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
struct request *rq, int at_head,
rq_end_io_fn *done)
{
int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK;
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
rq->errors = -ENXIO;
if (rq->end_io)
rq->end_io(rq, rq->errors);
return;
}
rq->rq_disk = bd_disk;
rq->end_io = done;
WARN_ON(irqs_disabled());
spin_lock_irq(q->queue_lock);
__elv_add_request(q, rq, where, 1);
__generic_unplug_device(q);
/* the queue is stopped so it won't be plugged+unplugged */
if (blk_pm_resume_request(rq))
q->request_fn(q);
spin_unlock_irq(q->queue_lock);
}
