rbd-calc.py

#!/usr/bin/env python

from optparse import OptionParser

def get_object_name(prefix, sector, order):
    sector_size = 512
    return "%s.%012x" % (prefix, (sector * sector_size) / pow(2, order))

def main():
    parser = OptionParser()
    parser.add_option("-p", "--prefix", dest="prefix", type="string",
                  help="The RBD block name prefix")
    parser.add_option("-o", "--order", dest="order", type="int",
                  default=22, help="The order size of the image")
    parser.add_option("-s", "--sector", dest="sector", type="int",
                  default=0, help="The sector of the disk")

    (options, args) = parser.parse_args()

    print get_object_name(options.prefix, options.sector, options.order)

if __name__ == "__main__":
    main()