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51e90d49ba
Instead of using size of 'empty header' in vdopool use fixed size 4K for a 'wrappeing' vdo-pool device. This fixes the issue when user tried to activate vdo-pool after a conversion from vdo managed device with 'vgchange -ay' - where this command activated all LVs with 'vdo-pool' wrapping device as well, but this converted pool uses 0-length header. This 4k size should usually prevent other tools like 'blkid' recognize such device as anything - so it shouldn't cause any problems with duplicate indentification of devices. (cherry picked from commit e8e6347ba3f59cbd2f7e92aa707543b90fa607a3)