virtio-blk: improve virtqueue error to BLK_STS

Let's change the mapping between virtqueue_add errors to BLK_STS
statuses, so that -ENOSPC, which indicates virtqueue full is still
mapped to BLK_STS_DEV_RESOURCE, but -ENOMEM which indicates non-device
specific resource outage is mapped to BLK_STS_RESOURCE.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Link: https://lore.kernel.org/r/20200213123728.61216-3-pasic@linux.ibm.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index adfe43f5ffe48f354129960cfd89cb4db600784e..0736248999b0da7f81d81a1c9525483759444634 100644 (file)
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -251,9 +251,14 @@ static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
                if (err == -ENOSPC)
                        blk_mq_stop_hw_queue(hctx);
                spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
-               if (err == -ENOMEM || err == -ENOSPC)
+               switch (err) {
+               case -ENOSPC:
                        return BLK_STS_DEV_RESOURCE;
-               return BLK_STS_IOERR;
+               case -ENOMEM:
+                       return BLK_STS_RESOURCE;
+               default:
+                       return BLK_STS_IOERR;
+               }
        }
 
        if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq))