partIDLock := er.NewNSLock(bucket, pathJoin(object, uploadID, strconv.Itoa(partID)))
	plkctx, err := partIDLock.GetLock(ctx, globalOperationTimeout)
	if err != nil {
		return PartInfo{}, err
	}

	ctx = plkctx.Context()
	defer partIDLock.Unlock(plkctx)

	// Read lock for upload id, only held while reading the upload metadata.
	uploadIDRLock := er.NewNSLock(bucket, pathJoin(object, uploadID))

	}

	// This call shouldn't be used for anything other than metadata updates or adding self referential versions.
	if !srcInfo.metadataOnly {
		return oi, NotImplemented{}
	}

	if !dstOpts.NoLock {
		lk := er.NewNSLock(dstBucket, dstObject)
		lkctx, err := lk.GetLock(ctx, globalOperationTimeout)
		if err != nil {
			return oi, err
		}
		ctx = lkctx.Context()
		defer lk.Unlock(lkctx)
	}

New, and making New // too complex to inline itself. // //go:noinline func newOutlined(b *Block, key []byte) (*Block, error) { switch len(key) { case aes128KeySize, aes192KeySize, aes256KeySize: default: return nil, KeySizeError(len(key)) } return newBlock(b, key), nil } func newBlockExpanded(c *blockExpanded, key []byte) { switch len(key) { case aes128KeySize: c.rounds = aes128Rounds case aes192KeySize: c.rounds = aes192Rounds case aes256KeySize: c.rounds = aes256Rounds } expandKeyGeneric(c, key)...