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Add DetachVhd entrypoint

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Signed-off-by: John Howard <jhoward@microsoft.com>
This commit is contained in:
John Howard
2018-08-23 15:01:31 -07:00
parent 399410cd8c
commit 275ee76c20
2 changed files with 61 additions and 0 deletions
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vhd/vhd.go
+26
View File
@@ -7,6 +7,8 @@ import "syscall"
//go:generate go run mksyscall_windows.go -output zvhd.go vhd.go
//sys createVirtualDisk(virtualStorageType *virtualStorageType, path string, virtualDiskAccessMask uint32, securityDescriptor *uintptr, flags uint32, providerSpecificFlags uint32, parameters *createVirtualDiskParameters, o *syscall.Overlapped, handle *syscall.Handle) (err error) [failretval != 0] = VirtDisk.CreateVirtualDisk
//sys openVirtualDisk(virtualStorageType *virtualStorageType, path string, virtualDiskAccessMask uint32, flags uint32, parameters *uintptr, handle *syscall.Handle) (err error) [failretval != 0] = VirtDisk.OpenVirtualDisk
//sys detachVirtualDisk(handle syscall.Handle, flags uint32, providerSpecificFlags uint32) (err error) [failretval != 0] = VirtDisk.DetachVirtualDisk
type virtualStorageType struct {
DeviceID uint32
@@ -80,3 +82,27 @@ func CreateVhdx(path string, maxSizeInGb, blockSizeInMb uint32) error {
return nil
}
// DetachVhd detaches a VHD attached at the given path.
func DetachVhd(path string) error {
var (
defaultType virtualStorageType
handle syscall.Handle
)
if err := openVirtualDisk(
&defaultType,
path,
virtualDiskAccessDETACH,
0,
nil,
&handle); err != nil {
return err
}
defer syscall.CloseHandle(handle)
if err := detachVirtualDisk(handle, 0, 0); err != nil {
return err
}
return nil
}
vhd/zvhd.go
+35
View File
@@ -40,6 +40,8 @@ var (
modVirtDisk = windows.NewLazySystemDLL("VirtDisk.dll")
procCreateVirtualDisk = modVirtDisk.NewProc("CreateVirtualDisk")
procOpenVirtualDisk = modVirtDisk.NewProc("OpenVirtualDisk")
procDetachVirtualDisk = modVirtDisk.NewProc("DetachVirtualDisk")
)
func createVirtualDisk(virtualStorageType *virtualStorageType, path string, virtualDiskAccessMask uint32, securityDescriptor *uintptr, flags uint32, providerSpecificFlags uint32, parameters *createVirtualDiskParameters, o *syscall.Overlapped, handle *syscall.Handle) (err error) {
@@ -62,3 +64,36 @@ func _createVirtualDisk(virtualStorageType *virtualStorageType, path *uint16, vi
}
return
}
func openVirtualDisk(virtualStorageType *virtualStorageType, path string, virtualDiskAccessMask uint32, flags uint32, parameters *uintptr, handle *syscall.Handle) (err error) {
var _p0 *uint16
_p0, err = syscall.UTF16PtrFromString(path)
if err != nil {
return
}
return _openVirtualDisk(virtualStorageType, _p0, virtualDiskAccessMask, flags, parameters, handle)
}
func _openVirtualDisk(virtualStorageType *virtualStorageType, path *uint16, virtualDiskAccessMask uint32, flags uint32, parameters *uintptr, handle *syscall.Handle) (err error) {
r1, _, e1 := syscall.Syscall6(procOpenVirtualDisk.Addr(), 6, uintptr(unsafe.Pointer(virtualStorageType)), uintptr(unsafe.Pointer(path)), uintptr(virtualDiskAccessMask), uintptr(flags), uintptr(unsafe.Pointer(parameters)), uintptr(unsafe.Pointer(handle)))
if r1 != 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func detachVirtualDisk(handle syscall.Handle, flags uint32, providerSpecificFlags uint32) (err error) {
r1, _, e1 := syscall.Syscall(procDetachVirtualDisk.Addr(), 3, uintptr(handle), uintptr(flags), uintptr(providerSpecificFlags))
if r1 != 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}