MOUNTMGR_VOLUME_MOUNT_POINT - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTIOAPI_H

// Input structure for IOCTL_MOUNTMGR_VOLUME_MOUNT_POINT_CREATED and
// IOCTL_MOUNTMGR_VOLUME_MOUNT_POINT_DELETED.
typedef struct _MOUNTMGR_VOLUME_MOUNT_POINT
{
    USHORT SourceVolumeNameOffset;
    USHORT SourceVolumeNameLength;
    USHORT TargetVolumeNameOffset;
    USHORT TargetVolumeNameLength;
} MOUNTMGR_VOLUME_MOUNT_POINT, *PMOUNTMGR_VOLUME_MOUNT_POINT;

#endif

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This structure is documented in Windows Driver Kit.