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//go:build linux && cgo
// +build linux,cgo
package devicemapper // import "github.com/docker/docker/pkg/devicemapper"
import (
"unsafe"
"golang.org/x/sys/unix"
)
func ioctlBlkGetSize64(fd uintptr) (int64, error) {
var size int64
if _, _, err := unix.Syscall(unix.SYS_IOCTL, fd, BlkGetSize64, uintptr(unsafe.Pointer(&size))); err != 0 {
return 0, err
}
return size, nil
}
func ioctlBlkDiscard(fd uintptr, offset, length uint64) error {
var r [2]uint64
r[0] = offset
r[1] = length
if _, _, err := unix.Syscall(unix.SYS_IOCTL, fd, BlkDiscard, uintptr(unsafe.Pointer(&r[0]))); err != 0 {
return err
}
return nil
}
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