/**
* After merging the snapshots, update the image and snapshot records in the database to reflect
* the changes. This handles either forward or backwards merge (detected). It will either then
* remove the images, or mark them illegal (to handle the case where image deletion failed).
*
* @param removeImages Remove the images from the database, or if false, only mark them illegal
*/
private void syncDbRecords(boolean removeImages) {
// If deletion failed after a backwards merge, the snapshots' images need to be swapped
// as they would upon success. Instead of removing them, mark them illegal.
DiskImage baseImage = getDiskImage();
DiskImage topImage = getDestinationDiskImage();
// The vdsm merge verb may decide to perform a forward or backward merge.
if (topImage == null) {
log.debug("No merge destination image, not updating image/snapshot association");
} else if (getParameters().getMergeStatusReturnValue().getBlockJobType()
== VmBlockJobType.PULL) {
// For forward merge, the volume format and type may change.
topImage.setvolumeFormat(baseImage.getVolumeFormat());
topImage.setVolumeType(baseImage.getVolumeType());
topImage.setParentId(baseImage.getParentId());
topImage.setImageStatus(ImageStatus.OK);
getBaseDiskDao().update(topImage);
getImageDao().update(topImage.getImage());
updateDiskImageDynamic(topImage);
updateVmConfigurationForImageRemoval(
baseImage.getImage().getSnapshotId(), baseImage.getImageId());
} else {
// For backwards merge, the prior base image now has the data associated with the newer
// snapshot we want to keep. Re-associate this older image with the newer snapshot.
// The base snapshot is deleted if everything went well. In case it's not deleted, we
// hijack it to preserve a link to the broken image. This makes the image discoverable
// so that we can retry the deletion later, yet doesn't corrupt the VM image chain.
List<DiskImage> children =
DbFacade.getInstance().getDiskImageDao().getAllSnapshotsForParent(topImage.getImageId());
if (!children.isEmpty()) {
DiskImage childImage = children.get(0);
childImage.setParentId(baseImage.getImageId());
getImageDao().update(childImage.getImage());
}
Image oldTopImage = topImage.getImage();
topImage.setImage(baseImage.getImage());
baseImage.setImage(oldTopImage);
Guid oldTopSnapshotId = topImage.getImage().getSnapshotId();
topImage.getImage().setSnapshotId(baseImage.getImage().getSnapshotId());
baseImage.getImage().setSnapshotId(oldTopSnapshotId);
boolean oldTopIsActive = topImage.getImage().isActive();
topImage.getImage().setActive(baseImage.getImage().isActive());
VolumeClassification baseImageVolumeClassification =
VolumeClassification.getVolumeClassificationByActiveFlag(baseImage.getImage().isActive());
topImage.getImage().setVolumeClassification(baseImageVolumeClassification);
baseImage.getImage().setActive(oldTopIsActive);
VolumeClassification oldTopVolumeClassification =
VolumeClassification.getVolumeClassificationByActiveFlag(oldTopIsActive);
topImage.getImage().setVolumeClassification(oldTopVolumeClassification);
topImage.setSize(baseImage.getSize());
topImage.setImageStatus(ImageStatus.OK);
getBaseDiskDao().update(topImage);
getImageDao().update(topImage.getImage());
updateDiskImageDynamic(topImage);
getBaseDiskDao().update(baseImage);
getImageDao().update(baseImage.getImage());
updateVmConfigurationForImageChange(
topImage.getImage().getSnapshotId(), baseImage.getImageId(), topImage);
updateVmConfigurationForImageRemoval(
baseImage.getImage().getSnapshotId(), topImage.getImageId());
}
Set<Guid> imagesToUpdate = getParameters().getMergeStatusReturnValue().getImagesToRemove();
if (imagesToUpdate == null) {
log.error("Failed to update orphaned images in db: image list could not be retrieved");
return;
}
for (Guid imageId : imagesToUpdate) {
if (removeImages) {
getImageDao().remove(imageId);
} else {
// The (illegal && no-parent && no-children) status indicates an orphaned image.
Image image = getImageDao().get(imageId);
image.setStatus(ImageStatus.ILLEGAL);
image.setParentId(Guid.Empty);
getImageDao().update(image);
}
}
}
