def map_volume(name, assume_v0=False, v0_size=-1, readonly=False, **kwargs):
if not loaded_module("blktap"):
raise Error("blktap module not loaded")
if not is_valid_name(name):
raise Error("Invalid volume name")
device = is_mapped(name)
if device is not None:
raise Error("Volume %s already mapped on device %s%s" % (name,
'/dev/xen/blktap-2/tapdev', device))
try:
device = VlmcTapdisk.create(name, vport=peers['vlmcd'].portno_start,
mport=peers['mapperd'].portno_start,
assume_v0=assume_v0, v0_size=v0_size,
readonly=readonly)
if device:
sys.stderr.write(device + '\n')
return device.split(DEVICE_PREFIX)[1]
raise Error("Cannot map volume '%s'.\n" % name)
except Exception, reason:
raise Error(name + ': ' + str(reason))
