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rbd: flatten cloned images to freeup snapshot

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flatten cloned images to remove the link
with the snapshot as the parent snapshot can
be removed from the trash.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit is contained in:
Madhu Rajanna 2020-07-01 12:35:07 +05:30 committed by mergify[bot]
parent 8ef7143e6c
commit 61a81d35e8
2 changed files with 50 additions and 3 deletions
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17
internal/rbd/controllerserver.go
View File

@ -723,7 +723,24 @@ func (cs *ControllerServer) CreateSnapshot(ctx context.Context, req *csi.CreateS
},
}, nil
}
var snaps []snapshotInfo
// check the number of snapshots on image
snaps, err = rbdVol.listSnapshots(ctx, cr)
if err != nil {
var einf ErrImageNotFound
if errors.As(err, &einf) {
return nil, status.Error(codes.InvalidArgument, err.Error())
}
return nil, status.Error(codes.Internal, err.Error())
}
if len(snaps) > int(maxSnapshotsOnImage) {
err = flattenClonedRbdImages(ctx, snaps, rbdVol.Pool, rbdVol.Monitors, cr)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
return nil, status.Errorf(codes.ResourceExhausted, "rbd image %s has %d snapshots", rbdVol, len(snaps))
}
err = reserveSnap(ctx, rbdSnap, rbdVol, cr)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())

32
internal/rbd/rbd_util.go
View File

@ -417,12 +417,42 @@ func (rv *rbdVolume) getCloneDepth(ctx context.Context) (uint, error) {
}
}
func flattenClonedRbdImages(ctx context.Context, snaps []snapshotInfo, pool, monitors string, cr *util.Credentials) error {
rv := &rbdVolume{
Monitors: monitors,
Pool: pool,
}
defer rv.Destroy()
err := rv.Connect(cr)
if err != nil {
klog.Errorf(util.Log(ctx, "failed to open connection %s; err %v"), rv, err)
return err
}
for _, s := range snaps {
if s.Namespace.Type == "trash" {
rv.RbdImageName = s.Namespace.OriginalName
err = rv.flattenRbdImage(ctx, cr, true)
if err != nil {
klog.Errorf(util.Log(ctx, "failed to flatten %s; err %v"), rv, err)
continue
}
}
}
return nil
}
func (rv *rbdVolume) flattenRbdImage(ctx context.Context, cr *util.Credentials, forceFlatten bool) error {
depth, err := rv.getCloneDepth(ctx)
var depth uint
var err error
// skip clone depth check if request is for force flatten
if !forceFlatten {
depth, err = rv.getCloneDepth(ctx)
if err != nil {
return err
}
klog.Infof(util.Log(ctx, "clone depth is (%d), configured softlimit (%d) and hardlimit (%d) for %s"), depth, rbdSoftMaxCloneDepth, rbdHardMaxCloneDepth, rv)
}
if forceFlatten || (depth >= rbdHardMaxCloneDepth) || (depth >= rbdSoftMaxCloneDepth) {
args := []string{"flatten", rv.Pool + "/" + rv.RbdImageName, "--id", cr.ID, "--keyfile=" + cr.KeyFile, "-m", rv.Monitors}