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: devmapper_wrapper.go
    path of file: ./repos/podman/vendor/github.com/containers/storage/pkg/devicemapper
    
    the code of the file until where you have to start completion: //go:build linux && cgo
// +build linux,cgo

package devicemapper

/*
#define _GNU_SOURCE
#include <libdevmapper.h>
#include <linux/fs.h>   // FIXME: present only for BLKGETSIZE64, maybe we can remove it?

// FIXME: Can't we find a way to do the logging in pure Go?
extern void StorageDevmapperLogCallback
    
func dmGetNextTargetFct(task *cdmTask, next unsafe.Pointer, start, length *uint64, target, params *string) unsafe.Pointer {
	var (
		Cstart, Clength      C.uint64_t
		CtargetType, Cparams *C.char
	)
	defer func() {
		*start = uint64(Cstart)
		*length = uint64(Clength)
		*target = C.GoString(CtargetType)
		*params = C.GoString(Cparams)
	}()

	nextp := C.dm_get_next_target((*C.struct_dm_task)(task), next, &Cstart, &Clength, &CtargetType, &Cparams)
	return nextp
}