openstack/cinder
Code Issues Proposed changes

PowerMax Driver - Fix non-temporary snapshot delete

Browse Source 
Fix bug where non-temporary snapshots were being
deleted from volume when do_sync_check is called
for that volume, caused by missing check for
temporary snapshot naming convention. Fixed by
adding this check back into the conditional
that determined if a snapshot should be deleted.

Change-Id: I20194f57437e9ece5d95259bd91c95a4f19d9ab5
Closes-Bug: 1887962
This commit is contained in:
odonos12 2020-07-17 14:43:13 +01:00 committed by Helen Walsh
parent 2eba48730e
commit a7f9eda389
3 changed files with 68 additions and 37 deletions
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67
cinder/tests/unit/volume/drivers/dell_emc/powermax/test_powermax_common.py
View File

@ -3165,19 +3165,6 @@ class PowerMaxCommonTest(test.TestCase):
port = self.common._get_unisphere_port()
self.assertEqual(ref_port, port)
@mock.patch.object(common.PowerMaxCommon,
'_do_sync_check')
def test_sync_check_no_source_device_on_array(self, mock_check):
with mock.patch.object(self.rest, 'get_volume',
side_effect=exception.VolumeBackendAPIException(
"404 00123 does not exist")):
array = self.data.array
device_id = self.data.device_id
extra_specs = self.data.extra_specs
self.common._sync_check(array, device_id, extra_specs,
source_device_id='00123')
mock_check.assert_not_called()
def test_sync_check(self):
array = self.data.array
device_id = self.data.device_id
@ -3186,13 +3173,13 @@ class PowerMaxCommonTest(test.TestCase):
with mock.patch.object(self.common, '_do_sync_check') as mck_sync:
self.common._sync_check(array, device_id, extra_specs, False,
self.data.device_id2)
mck_sync.assert_called_with(array, self.data.device_id2,
mck_sync.assert_called_with(array, self.data.device_id,
extra_specs, False)
mck_sync.reset_mock()
with mock.patch.object(self.common, '_get_target_source_device',
return_value=self.data.device_id3):
self.common._sync_check(array, device_id, extra_specs, True)
mck_sync.assert_called_with(array, self.data.device_id3,
mck_sync.assert_called_with(array, self.data.device_id,
extra_specs, True)
mck_sync.reset_mock()
self.common._sync_check(array, device_id, extra_specs)
@ -3215,30 +3202,64 @@ class PowerMaxCommonTest(test.TestCase):
@mock.patch.object(provision.PowerMaxProvision, 'delete_temp_volume_snap')
@mock.patch.object(provision.PowerMaxProvision, 'unlink_snapvx_tgt_volume')
def test_unlink_targets_and_delete_temp_snapvx(self, mck_break, mck_del):
def test_unlink_targets_and_delete_temp_snapvx_legacy(
self, mck_break, mck_del):
array = self.data.array
extra_specs = self.data.extra_specs
session = self.data.snap_tgt_session_cm_enabled
session = deepcopy(self.data.snap_tgt_session_cm_enabled)
legacy_snap_name = 'EMC_SMI'
session['snap_name'] = legacy_snap_name
source = session['source_vol_id']
snap_id = session['snapid']
target = session['target_vol_id']
self.common._unlink_targets_and_delete_temp_snapvx(
session, array, extra_specs)
mck_break.assert_called_with(array, target, source, legacy_snap_name,
extra_specs, snap_id, True)
mck_del.assert_called_once_with(
array, legacy_snap_name, source, snap_id)
@mock.patch.object(provision.PowerMaxProvision, 'delete_temp_volume_snap')
@mock.patch.object(provision.PowerMaxProvision, 'unlink_snapvx_tgt_volume')
def test_unlink_targets_and_delete_temp_snapvx_is_temp(
self, mck_break, mck_del):
array = self.data.array
extra_specs = self.data.extra_specs
session = deepcopy(self.data.snap_tgt_session_cm_enabled)
snap_name = session['snap_name']
source = session['source_vol_id']
snap_id = session['snapid']
target = session['target_vol_id']
self.common._unlink_targets_and_delete_temp_snapvx(
session, array, extra_specs)
mck_break.assert_called_with(array, target, source, snap_name,
extra_specs, snap_id, True)
mck_del.assert_called_once_with(array, snap_name, source, snap_id)
mck_break.reset_mock()
mck_del.reset_mock()
def test_unlink_targets_and_delete_temp_snapvx_no_snap_name_found(self):
array = self.data.array
extra_specs = self.data.extra_specs
session = dict()
self.assertRaises(exception.VolumeBackendAPIException,
self.common._unlink_targets_and_delete_temp_snapvx,
session, array, extra_specs)
session['copy_mode'] = False
session['expired'] = True
@mock.patch.object(provision.PowerMaxProvision, 'delete_temp_volume_snap')
@mock.patch.object(provision.PowerMaxProvision, 'unlink_snapvx_tgt_volume')
def test_unlink_targets_and_delete_temp_snapvx_not_legacy_not_temp(
self, mck_break, mck_del):
array = self.data.array
extra_specs = self.data.extra_specs
session = deepcopy(self.data.snap_tgt_session_cm_enabled)
session['snap_name'] = 'not_leg_or_tmp'
snap_name = session['snap_name']
source = session['source_vol_id']
snap_id = session['snapid']
target = session['target_vol_id']
self.common._unlink_targets_and_delete_temp_snapvx(
session, array, extra_specs)
mck_break.assert_called_with(array, target, source, snap_name,
extra_specs, snap_id, False)
extra_specs, snap_id, True)
mck_del.assert_not_called()
@mock.patch.object(rest.PowerMaxRest, 'find_snap_vx_sessions',

31
cinder/volume/drivers/dell_emc/powermax/common.py
View File

@ -2909,16 +2909,10 @@ class PowerMaxCommon(object):
if source_device_id:
@coordination.synchronized("emc-source-{src_device_id}")
def do_unlink_and_delete_snap(src_device_id):
# Check if source device exists on the array
try:
self.rest.get_volume(array, src_device_id)
except exception.VolumeBackendAPIException:
LOG.debug("Device %(device_id)s not found on array, no "
"sync check required.",
{'device_id': src_device_id})
return
LOG.debug("Locking on source device %(device_id)s.",
{'device_id': src_device_id})
self._do_sync_check(
array, src_device_id, extra_specs, tgt_only)
array, device_id, extra_specs, tgt_only)
do_unlink_and_delete_snap(source_device_id)
else:
@ -2961,9 +2955,15 @@ class PowerMaxCommon(object):
:param extra_specs: extra specifications
"""
snap_name = session.get('snap_name')
if not snap_name:
msg = _("Snap_name not present in volume's snapvx session. "
"Unable to perform unlink and cleanup.")
LOG.error(msg)
raise exception.VolumeBackendAPIException(msg)
source = session.get('source_vol_id')
snap_id = session.get('snapid')
expired = session.get('expired')
is_legacy = 'EMC_SMI' in snap_name
is_temp = utils.CLONE_SNAPSHOT_NAME in snap_name
target, cm_enabled = None, False
if session.get('target_vol_id'):
@ -2982,10 +2982,13 @@ class PowerMaxCommon(object):
# Candidates for deletion:
# 1. If legacy snapshot with 'EMC_SMI' in snapshot name
# 2. If snapVX snapshot with copy mode enabled
# 3. If snapVX snapshot with copy mode disabled and not expired
if ('EMC_SMI' in snap_name or cm_enabled or (
not cm_enabled and not expired)):
# 2. If snapVX snapshot is temporary
# If a target is present in the snap session it will be unlinked by
# the provision.unlink_snapvx_tgt_volume call above. This accounts
# for both CM enabled and disabled, as such by this point there will
# either be no target or it would have been unlinked, therefore
# delete if it is legacy or temp.
if is_legacy or is_temp:
LOG.debug(
"Deleting temporary snapshot. Source: %(vol)s, snap name: "
"%(name)s, snap id: %(snapid)s.", {

7
releasenotes/notes/bug-1887962-643379faf20f01cf.yaml Normal file
View File

@ -0,0 +1,7 @@
---
fixes:
- |
`Bug #1887962 <https://bugs.launchpad.net/cinder/+bug/1887962>`_:
PowerMax driver fix to rectify incorrectly deleted non-temporary
snapshots when calling do_sync_check used in multiple operations due
to missing check for temporary snapshot name.