Commit eb464833 authored May 11, 2018 by Chaitanya Kulkarni Committed by Christoph Hellwig May 25, 2018

nvmet-loop: use nr_phys_segments when map rq to sgl



Use blk_rq_nr_phys_segments() instead of blk_rq_payload_bytes() to check
if a command contains data to me mapped.  This fixes the case where
a struct requests contains LBAs, but no data will actually be send,
e.g. the pending Write Zeroes support.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

parent 17d78252

drivers/nvme/target/loop.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -174,7 +174,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
		&queue->nvme_sq, &nvme_loop_ops))
		return BLK_STS_OK;

		if (blk_rq_payload_bytes(req)) {
		if (blk_rq_nr_phys_segments(req)) {
		iod->sg_table.sgl = iod->first_sgl;
		if (sg_alloc_table_chained(&iod->sg_table,
		blk_rq_nr_phys_segments(req),