D48687.diff
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D48687.diff
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	diff --git a/sys/cam/scsi/scsi_da.c b/sys/cam/scsi/scsi_da.c
	--- a/sys/cam/scsi/scsi_da.c
	+++ b/sys/cam/scsi/scsi_da.c
	@@ -1899,7 +1899,15 @@
	cam_periph_lock(periph);

	/*
	- * If the device has been made invalid, error out
	+ * If the pack has been invalidated, fail all I/O. The medium is not
	+ * suitable for normal I/O, because one or more is ture:
	+ * - the medium is missing
	+ * - its size is unknown
	+ * - it differs from the medium present at daopen
	+ * - we're tearing the cam periph device down
	+ * Since we have the cam periph lock, we don't need to check it for
	+ * the last condition since PACK_INVALID is set when we invalidate
	+ * the device.
	*/
	if ((softc->flags & DA_FLAG_PACK_INVALID)) {
	cam_periph_unlock(periph);
	@@ -1946,6 +1954,10 @@
	softc = (struct da_softc *)periph->softc;
	secsize = softc->params.secsize;

	+ /*
	+ * Can't dump to a disk that's not there or changed, for whatever
	+ * reason.
	+ */
	if ((softc->flags & DA_FLAG_PACK_INVALID) != 0)
	return (ENXIO);