replication: clarify permissions
Even if hidden_disk, secondary_disk are backing files, they all need write permissions in replication scenario. Otherwise we will encouter below exceptions on secondary side during adding nbd server: {'execute': 'nbd-server-add', 'arguments': {'device': 'colo-disk', 'writable': true } } {"error": {"class": "GenericError", "desc": "Conflicts with use by hidden-qcow2-driver as 'backing', which does not allow 'write' on sec-qcow2-driver-for-nbd"}} CC: Zhang Hailiang <zhang.zhanghailiang@huawei.com> CC: Zhang Chen <zhangchen.fnst@cn.fujitsu.com> CC: Wen Congyang <wencongyang2@huawei.com> Signed-off-by: NChanglong Xie <xiecl.fnst@cn.fujitsu.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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