restic/internal/restorer/preallocate_linux.go

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package restorer
import (
"os"
"golang.org/x/sys/unix"
)
func preallocateFile(wr *os.File, size int64) error {
if size <= 0 {
return nil
}
// int fallocate(int fd, int mode, off_t offset, off_t len)
// use mode = 0 to also change the file size
return unix.Fallocate(int(wr.Fd()), 0, 0, size)
}