K 10
svn:author
V 2
mm
K 8
svn:date
V 27
2010-08-12T05:59:55.420625Z
K 7
svn:log
V 193
MFC r211091:

Return EIO if vdev->v_phys_read is NULL.

This fixes booting from a ZFS mirror with a unavailable primary device.

PR:		kern/148655
Reviewed by:	avg
Approved by:	delphij (mentor)

END