You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: reification.go
    path of file: ./repos/sealer/vendor/github.com/ipfs/go-unixfsnode
    
    the code of the file until where you have to start completion: package unixfsnode

import (
	"context"
	"fmt"

	"github.com/ipfs/go-unixfsnode/data"
	"github.com/ipfs/go-unixfsnode/directory"
	"github.com/ipfs/go-unixfsnode/hamt"
	dagpb "github.com/ipld/go-codec-dagpb"
	"github.com/ipld/go-ipld-prime"
)

// Reify looks at an ipld Node and tries to interpret it as a UnixFSNode
// if successful, it returns the UnixFSNode
func Reify(lnkCtx ipld.LinkContext, maybePBNodeRoot ipld.Node, lsys *ipld.LinkSystem) (ipld.Node, error) {
	pbNode, ok := maybePBNodeRoot.(dagpb.PBNode)
	if !ok 
    
func Reify(lnkCtx ipld.LinkContext, maybePBNodeRoot ipld.Node, lsys *ipld.LinkSystem) (ipld.Node, error) {
	pbNode, ok := maybePBNodeRoot.(dagpb.PBNode)
	if !ok {
		return maybePBNodeRoot, nil
	}
	if !pbNode.FieldData().Exists() {
		// no data field, therefore, not UnixFS
		return defaultReifier(lnkCtx.Ctx, pbNode, lsys)
	}
	data, err := data.DecodeUnixFSData(pbNode.Data.Must().Bytes())
	if err != nil {
		// we could not decode the UnixFS data, therefore, not UnixFS
		return defaultReifier(lnkCtx.Ctx, pbNode, lsys)
	}
	builder, ok := reifyFuncs[data.FieldDataType().Int()]
	if !ok {
		return nil, fmt.Errorf("no reification for this UnixFS node type")
	}
	return builder(lnkCtx.Ctx, pbNode, data, lsys)
}