def majorminor(self):
'''Returns a tuple of the major and minor device numbers'''
if self._majorminor is not None:
return self._majorminor
if self.is_blockdevice:
self._majorminor = blktools.get_majorminor(self._devpath)
elif self._attached:
self._majorminor = blktools.get_majorminor(self._blockdevice)
return self._majorminor
def next_nbd():
'''Returns the next free nbd device'''
nbds = [ os.path.join('/dev', d) for d in os.listdir('/dev') \
if d.startswith('nbd')]
ids = sorted([get_majorminor(os.path.join('/dev', nbd)) + (nbd,) \
for nbd in nbds])
for id_ in ids:
if not get_disksize(id_[:2]):
return id_[2]
