scsi: Reject unimplemented error actions

drive_init() doesn't permit rerror for if=scsi, but that's worthless:
we get it via if=none and -device.

Moreover, scsi-generic doesn't support werror.  Since drive_init()
doesn't catch that, option werror was silently ignored even with
if=scsi.

Wart: unlike drive_init(), we don't reject the default action when
it's explicitly specified.  That's because we can't distinguish "no
rerror option" from "rerror=report", or "no werror" from
"rerror=enospc".  Left for another day.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/hw/scsi-generic.c b/hw/scsi-generic.c
index 3915e78..a8b4176 100644
--- a/hw/scsi-generic.c
+++ b/hw/scsi-generic.c
@@ -474,6 +474,15 @@ static int scsi_generic_initfn(SCSIDevice *dev)
         return -1;
     }
 
+    if (bdrv_get_on_error(s->bs, 0) != BLOCK_ERR_STOP_ENOSPC) {
+        error_report("Device doesn't support drive option werror");
+        return -1;
+    }
+    if (bdrv_get_on_error(s->bs, 1) != BLOCK_ERR_REPORT) {
+        error_report("Device doesn't support drive option rerror");
+        return -1;
+    }
+
     /* check we are using a driver managing SG_IO (version 3 and after */
     if (bdrv_ioctl(s->bs, SG_GET_VERSION_NUM, &sg_version) < 0 ||
         sg_version < 30000) {