zloop: clear nowait flag in workqueue context

The zloop driver advertises REQ_NOWAIT support through BLK_FEAT_NOWAIT
(enabled by default for all blk-mq devices), and honors the nowait
behavior throughout zloop_queue_rq().

However, actual I/O to the backing file is performed in a workqueue,
where blocking is allowed.

To avoid imposing unnecessary non-blocking constraints in this blocking
context, clear the REQ_NOWAIT flag before processing the request in the
workqueue context.

Signed-off-by: Chaitanya Kulkarni <[e-mail]>
Reviewed-by: Damien Le Moal <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

drivers/block/zloop.c

···
 	struct request *rq = blk_mq_rq_from_pdu(cmd);
 	struct zloop_device *zlo = rq->q->queuedata;
 
+	/* We can block in this context, so ignore REQ_NOWAIT. */
+	if (rq->cmd_flags & REQ_NOWAIT)
+		rq->cmd_flags &= ~REQ_NOWAIT;
+
 	switch (req_op(rq)) {
 	case REQ_OP_READ:
 	case REQ_OP_WRITE: