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moby--moby/pkg/devicemapper/ioctl.go
Aaron Lehmann 85357a1167 Make pkg/devicemapper and pkg/loopback depend on cgo in build tags
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
2017-03-29 17:55:42 -07:00

27 lines
552 B
Go

// +build linux,cgo
package devicemapper
import (
"syscall"
"unsafe"
)
func ioctlBlkGetSize64(fd uintptr) (int64, error) {
var size int64
if _, _, err := syscall.Syscall(syscall.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 := syscall.Syscall(syscall.SYS_IOCTL, fd, BlkDiscard, uintptr(unsafe.Pointer(&r[0]))); err != 0 {
return err
}
return nil
}