I mapped an image to a system, and used blockdev to make it readonly. But it failed.[root@ceph0 mnt]# blockdev --setro /dev/rbd2[root@ceph0 mnt]# blockdev --getro /dev/rbd20 It's on Centos6.4 with kernel 3.10.6 .Ceph 0.61.8 . Any idea?
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