//go:build linux

package backend

import (
	"os"

	"golang.org/x/sys/unix"

	"github.com/seaweedfs/seaweedfs/weed/glog"
)

func CreateVolumeFile(fileName string, preallocate int64, memoryMapSizeMB uint32) (BackendStorageFile, error) {
	file, e := OpenVolumeFile(fileName, os.O_RDWR|os.O_CREATE|os.O_TRUNC)
	if e != nil {
		return nil, e
	}
	if preallocate != 0 {
		if err := unix.Fallocate(int(file.Fd()), unix.FALLOC_FL_KEEP_SIZE, 0, preallocate); err != nil {
			glog.Warningf("Preallocate %d bytes disk space for %s: %v", preallocate, fileName, err)
		} else {
			glog.V(1).Infof("Preallocated %d bytes disk space for %s", preallocate, fileName)
		}
	}
	return NewDiskFile(file), nil
}