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rbd: flatten temp cloned images

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If the snapshots on the parent image exceeds
maxSnapshotsOnImage count, we need to flatten
all the temporary cloned images to over come the
krbd issue of maximum number of snapshots on
an image.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit is contained in:
Madhu Rajanna 2020-07-12 10:06:17 +05:30 committed by mergify[bot]
parent 2fe1ee5287
commit 8fc9146056
1 changed files with 48 additions and 8 deletions
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56
internal/rbd/controllerserver.go
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@ -227,15 +227,11 @@ func (cs *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
return buildCreateVolumeResponse(ctx, req, rbdVol)
}
if parentVol != nil {
// flatten the image or its parent before the reservation to avoid
// stale entries in post creation if we return ABORT error and the
// delete volume is not called
err = parentVol.flattenCloneImage(ctx)
if err != nil {
return nil, getGRPCErrorForCreateVolume(err)
}
err = flattenParentImage(ctx, parentVol, cr)
if err != nil {
return nil, err
}
err = reserveVol(ctx, rbdVol, rbdSnap, cr)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
@ -282,6 +278,50 @@ func (cs *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
return &csi.CreateVolumeResponse{Volume: volume}, nil
}
func flattenParentImage(ctx context.Context, rbdVol *rbdVolume, cr *util.Credentials) error {
if rbdVol != nil {
// flatten the image or its parent before the reservation to avoid
// stale entries in post creation if we return ABORT error and the
// delete volume is not called
err := rbdVol.flattenCloneImage(ctx)
if err != nil {
return getGRPCErrorForCreateVolume(err)
}
// flatten cloned images if the snapshot count on the parent image
// exceeds maxSnapshotsOnImage
err = flattenTemporaryClonedImages(ctx, rbdVol, cr)
if err != nil {
return err
}
}
return nil
}
// check snapshots on the rbd image, as we have limit from krbd that
// an image cannot have more than 510 snapshot at a given point of time.
// If the snapshots are more than the `maxSnapshotsOnImage` Add a task to
// flatten all the temporary cloned images.
func flattenTemporaryClonedImages(ctx context.Context, rbdVol *rbdVolume, cr *util.Credentials) error {
snaps, err := rbdVol.listSnapshots(ctx, cr)
if err != nil {
var einf ErrImageNotFound
if errors.As(err, &einf) {
return status.Error(codes.InvalidArgument, err.Error())
}
return status.Error(codes.Internal, err.Error())
}
if len(snaps) > int(maxSnapshotsOnImage) {
err = flattenClonedRbdImages(ctx, snaps, rbdVol.Pool, rbdVol.Monitors, cr)
if err != nil {
return status.Error(codes.Internal, err.Error())
}
return status.Errorf(codes.ResourceExhausted, "rbd image %s has %d snapshots", rbdVol, len(snaps))
}
return nil
}
// checkFlatten ensures that that the image chain depth is not reached
// hardlimit or softlimit. if the softlimit is reached it adds a task and
// return success,the hardlimit is reached it starts a task to flatten the