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Fix unexpected behavior in _clone_image_volume

Current, if we upload a snapshot-volume to image, then create
a new volume from this image, this new volume is created from
original snapshot rather than snapshot-volume.

That means if we already make some data change on a
snapshot-volume, then we export this snapshot-volume to image,
this image will lose all change data.

This patch try to fix this, we skip the "snapshot_id" and
"source_volid" when we create tmp image volume.

Closes-bug: 1795098

Change-Id: Icf0dadc1ce4d008ff437ca5dcde1817d2e560e44
changes/35/606235/3
Yikun Jiang 3 years ago
parent
commit
9d43d22bf3
  1. 7
      cinder/tests/unit/volume/test_image.py
  2. 7
      cinder/volume/manager.py

7
cinder/tests/unit/volume/test_image.py

@ -291,6 +291,7 @@ class CopyVolumeToImageTestCase(base.BaseVolumeTestCase):
# creating volume testdata
self.volume_attrs['instance_uuid'] = None
self.volume_attrs['snapshot_id'] = fake.SNAPSHOT_ID
db.volume_create(self.context, self.volume_attrs)
def fake_create(context, volume, **kwargs):
@ -314,6 +315,12 @@ class CopyVolumeToImageTestCase(base.BaseVolumeTestCase):
def test_copy_volume_to_image_with_image_volume(self):
image = self._test_copy_volume_to_image_with_image_volume()
self.assertTrue(image['locations'][0]['url'].startswith('cinder://'))
image_volume_id = image['locations'][0]['url'][9:]
# The image volume does NOT include the snapshot_id, and include the
# source_volid which is the uploaded-volume id.
vol_ref = db.volume_get(self.context, image_volume_id)
self.assertIsNone(vol_ref['snapshot_id'])
self.assertEqual(vol_ref['source_volid'], self.volume_id)
def test_copy_volume_to_image_with_image_volume_qcow2(self):
self.image_meta['disk_format'] = 'qcow2'

7
cinder/volume/manager.py

@ -1416,9 +1416,12 @@ class VolumeManager(manager.CleanableManager,
reserve_opts = {'volumes': 1, 'gigabytes': volume.size}
QUOTAS.add_volume_type_opts(ctx, reserve_opts, volume_type_id)
reservations = QUOTAS.reserve(ctx, **reserve_opts)
# NOTE(yikun): Skip 'snapshot_id', 'source_volid' keys to avoid
# creating tmp img vol from wrong snapshot or wrong source vol.
skip = {'snapshot_id', 'source_volid'}
skip.update(self._VOLUME_CLONE_SKIP_PROPERTIES)
try:
new_vol_values = {k: volume[k] for k in set(volume.keys()) -
self._VOLUME_CLONE_SKIP_PROPERTIES}
new_vol_values = {k: volume[k] for k in set(volume.keys()) - skip}
new_vol_values['volume_type_id'] = volume_type_id
new_vol_values['attach_status'] = (
fields.VolumeAttachStatus.DETACHED)

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