| // +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 |
| } |