def zero_block_size():
value = config.get('irs', 'zero_block_size_mb')
try:
value = int(value)
except ValueError:
raise exception.InvalidConfiguration(
reason="Unsupported value for irs:zero_block_size_mb",
zero_block_size_mb=value)
if value < MIN_BLOCK_SIZE_MB or value > MAX_BLOCK_SIZE_MB:
raise exception.InvalidConfiguration(
reason="Out of range value for irs:zero_block_size_mb",
zero_block_size_mb=value,
min=MIN_BLOCK_SIZE_MB,
max=MAX_BLOCK_SIZE_MB)
return value * constants.MEGAB
def default_qcow2_compat():
value = config.get('irs', 'qcow2_compat')
if value not in _QCOW2_COMPAT_SUPPORTED:
raise exception.InvalidConfiguration(
reason="Unsupported value for irs:qcow2_compat",
qcow2_compat=value,
supported_values=_QCOW2_COMPAT_SUPPORTED)
return value
def zero(device_path, size=None, task=_NullTask()):
"""
Zero a block device.
Arguments:
device_path (str): Path to block device to wipe
size (int): Number of bytes to write. If not specified, use the device
size. Size must be aligned to `vdsm.storage.constants.BLOCK_SIZE`.
task (`storage.task.Task`): Task running this operation. If specified,
the zero operation will be aborted if the task is aborted.
Raises:
`vdsm.common.exception.ActionStopped` if the wipe was aborted
`vdsm.storage.exception.VolumesZeroingError` if writing to storage
failed.
`vdsm.storage.exception.InvalidParameterException` if size is not
aligned to `vdsm.storage.constants.BLOCK_SIZE`.
"""
if size is None:
# Always aligned to LVM extent size (128MiB).
size = fsutils.size(device_path)
elif size % sc.BLOCK_SIZE:
raise se.InvalidParameterException("size", size)
log.info("Zeroing device %s (size=%d)", device_path, size)
with utils.stopwatch("Zero device %s" % device_path,
level=logging.INFO,
log=log):
zero_method = config.get('irs', 'zero_method')
try:
if zero_method == "blkdiscard":
_zero_blkdiscard(device_path, size, task)
elif zero_method == "dd":
_zero_dd(device_path, size, task)
else:
raise exception.InvalidConfiguration(
reason="Unsupported value for irs:zero_method",
zero_method=zero_method)
except se.StorageException as e:
raise se.VolumesZeroingError("Zeroing device %s failed: %s" %
(device_path, e))
def default_qcow2_compat():
value = config.get('irs', 'qcow2_compat')
if value not in _QCOW2_COMPAT_SUPPORTED:
raise exception.InvalidConfiguration(
"Unsupported value for irs:qcow2_compat: %r" % value)
return value
