def _create_linear(cls, dmname, table_lines):
"""
Create linear mapping based on table_lines.
Each line is a tuple in the dmsetup table format:
([start in sectors], [length in sectors], [type], [source device], [offset in sectors])
eg.
('4096', '8192', 'linear', '/dev/dm-2', '4192')
"""
dmsetup(['create', dmname, '/dev/stdin'], input='\n'.join([' '.join([str(col) for col in line]) for line in table_lines]))
devname = Device.from_device_file(udevctx, '/dev/mapper/%s' % dmname)['DEVNAME']
return cls(basename(devname))
def device_path(self): if not hasattr(self, '_device_path'): self._device_path = Device.from_device_file(udevctx, '/dev/mapper/%s' % self.dmname)['DEVNAME'] return self._device_path
