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scsi: virtio_scsi: Drop DID_NEXUS_FAILURE use

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DID_NEXUS_FAILURE is internal to the SCSI layer. Drivers must not use it
because:

 1. It's not propagated upwards, so SG IO/passthrough users will not see an
    error and think a command was successful.

 2. There is no handling for it in scsi_decide_disposition() so it results
    in entering SCSI error handling.

virtio_scsi gets this when something like qemu returns
VIRTIO_SCSI_S_NEXUS_FAILURE. It looks like qemu returns that error code if
host OS returns DID_NEXUS_FAILURE (qemu's internal
SCSI_HOST_RESERVATION_ERROR maps to DID_NEXUS_FAILURE). This shouldn't
happen for Linux since we don't propagate that error code to userspace.

This has us convert VIRTIO_SCSI_S_NEXUS_FAILURE to a
SAM_STAT_RESERVATION_CONFLICT in case some other virt layer is returning
it. In that case we will still get the reservation confict failure we
expect.

Link: https://lore.kernel.org/r/20220812010027.8251-6-michael.christie@oracle.com
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2022-08-11 20:00:22 -05:00 committed by Martin K. Petersen
parent beb4dac8d2
commit 377a7b0b1e
1 changed files with 1 additions and 1 deletions
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2
drivers/scsi/virtio_scsi.c
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@ -144,7 +144,7 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf)
set_host_byte(sc, DID_BAD_TARGET);
break;
case VIRTIO_SCSI_S_NEXUS_FAILURE:
set_host_byte(sc, DID_NEXUS_FAILURE);
set_status_byte(sc, SAM_STAT_RESERVATION_CONFLICT);
break;
default:
scmd_printk(KERN_WARNING, sc, "Unknown response %d",