def test__stop_device_stops_bcache_devs(self, m_exists, m_write, m_wait):
""" _stop_device accepts path and issue stop."""
device = self.random_string()
stop_path = os.path.join(device, 'stop')
m_exists.return_value = True
bcache._stop_device(device)
m_exists.assert_called_with(stop_path)
m_write.assert_called_with(stop_path, '1', mode=None)
m_wait.assert_called_with(stop_path, retries=bcache.BCACHE_RETRIES)
def test__stop_device_already_removed(self, m_exists, m_write, m_wait):
""" _stop_device skips if device path is missing. """
device = self.random_string()
stop_path = os.path.join(device, 'stop')
m_exists.return_value = False
bcache._stop_device(device)
m_exists.assert_called_with(stop_path)
self.assertEqual(0, m_write.call_count)
self.assertEqual(0, m_wait.call_count)
def test__stop_device_eats_err_calls_wait(self, m_exists, m_write, m_wait):
""" _stop_device eats IOError or OSErrors wait still called"""
device = self.random_string()
stop_path = os.path.join(device, 'stop')
m_exists.return_value = True
m_write.side_effect = IOError('permission denied')
bcache._stop_device(device)
m_exists.assert_called_with(stop_path)
m_write.assert_called_with(stop_path, '1', mode=None)
m_wait.assert_called_with(stop_path, retries=bcache.BCACHE_RETRIES)
def test__stop_device_raises_if_wait_expires(self, m_exists, m_write,
m_wait):
""" _stop_device raises OSError if wait time expires """
device = self.random_string()
stop_path = os.path.join(device, 'stop')
m_exists.return_value = True
m_wait.side_effect = (OSError('Timeout exeeded for removal of %s' %
stop_path))
with self.assertRaises(OSError):
bcache._stop_device(device)
m_exists.assert_called_with(stop_path)
m_write.assert_called_with(stop_path, '1', mode=None)
m_wait.assert_called_with(stop_path, retries=bcache.BCACHE_RETRIES)
def wipe_superblock(device):
"""
Wrapper for block.wipe_volume compatible with shutdown function interface
"""
blockdev = block.sysfs_to_devpath(device)
# when operating on a disk that used to have a dos part table with an
# extended partition, attempting to wipe the extended partition will fail
try:
if not block.is_online(blockdev):
LOG.debug("Device is not online (size=0), so skipping:"
" '%s'", blockdev)
return
if block.is_extended_partition(blockdev):
LOG.info(
"extended partitions do not need wiping, so skipping:"
" '%s'", blockdev)
return
except OSError as e:
if util.is_file_not_found_exc(e):
LOG.debug('Device to wipe disappeared: %s', e)
LOG.debug('/proc/partitions says: %s',
util.load_file('/proc/partitions'))
(parent, partnum) = block.get_blockdev_for_partition(blockdev)
out, _e = util.subp(['sfdisk', '-d', parent],
capture=True,
combine_capture=True)
LOG.debug('Disk partition info:\n%s', out)
return
else:
raise e
# gather any partitions
partitions = block.get_sysfs_partitions(device)
# release zfs member by exporting the pool
if zfs.zfs_supported() and block.is_zfs_member(blockdev):
poolname = zfs.device_to_poolname(blockdev)
# only export pools that have been imported
if poolname in zfs.zpool_list():
try:
zfs.zpool_export(poolname)
except util.ProcessExecutionError as e:
LOG.warning('Failed to export zpool "%s": %s', poolname, e)
if is_swap_device(blockdev):
shutdown_swap(blockdev)
# some volumes will be claimed by the bcache layer but do not surface
# an actual /dev/bcacheN device which owns the parts (backing, cache)
# The result is that some volumes cannot be wiped while bcache claims
# the device. Resolve this by stopping bcache layer on those volumes
# if present.
for bcache_path in ['bcache', 'bcache/set']:
stop_path = os.path.join(device, bcache_path)
if os.path.exists(stop_path):
LOG.debug('Attempting to release bcache layer from device: %s:%s',
device, stop_path)
if stop_path.endswith('set'):
rp = os.path.realpath(stop_path)
bcache.stop_cacheset(rp)
else:
bcache._stop_device(stop_path)
_wipe_superblock(blockdev)
# if we had partitions, make sure they've been removed
if partitions:
LOG.debug('%s had partitions, issuing partition reread', device)
retries = [.5, .5, 1, 2, 5, 7]
for attempt, wait in enumerate(retries):
try:
# only rereadpt on wiped device
block.rescan_block_devices(devices=[blockdev])
# may raise IOError, OSError due to wiped partition table
curparts = block.get_sysfs_partitions(device)
if len(curparts) == 0:
return
except (IOError, OSError):
if attempt + 1 >= len(retries):
raise
LOG.debug(
"%s partitions still present, rereading pt"
" (%s/%s). sleeping %ss before retry", device, attempt + 1,
len(retries), wait)
time.sleep(wait)
# multipath partitions are separate block devices (disks)
if multipath.is_mpath_partition(blockdev):
multipath.remove_partition(blockdev)
# multipath devices must be hidden to utilize a single member (path)
elif multipath.is_mpath_device(blockdev):
mp_id = multipath.find_mpath_id(blockdev)
if mp_id:
multipath.remove_map(mp_id)
else:
raise RuntimeError('Failed to find multipath id for %s' % blockdev)