def size(self):
'''Returns the size of the disk in bytes
:raises IOError: if the disk doesn't exist
'''
if self._size is not None:
return self._size
if self.is_blockdevice:
self._size = blktools.get_disksize(self.majorminor)
elif self._attached:
self._size = blktools.get_disksize(self.majorminor)
return self._size
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]
