The mount manager clients use this IOCTL to alert the mount manager that a volume mount point has been deleted so that the mount manager can replicate the database entry for the given mount point.

The Microsoft Win32 routine DeleteVolumeMountPoint sends this IOCTL to the mount manager, to inform the mount manager that a directory junction is no longer pointing to a volume name. The mount manager responds by deleting the volume name formerly contained in the directory junction along with its unique ID from the volume hosting the directory junction.

Major code


Input buffer

The mount manager client initializes the MOUNTMGR_VOLUME_MOUNT_POINT structure at the beginning of the buffer at Irp->AssociatedIrp.SystemBuffer.

Input buffer length

Parameters.DeviceIoControl.InputBufferLength in the I/O stack location of the IRP indicates the size, in bytes, of the input buffer, which must be greater than or equal to sizeof(MOUNTMGR_VOLUME_MOUNT_POINT).

Output buffer


Output buffer length


Input / Output buffer


Input / Output buffer length


Status block

If the operation is successful, the Status field is set to STATUS_SUCCESS.

If InputBufferLength is less than sizeof(MOUNTMGR_VOLUME_MOUNT_POINT), the Status field is set to STATUS_INVALID_PARAMETER.


For more information, see Supporting Mount Manager Requests in a Storage Class Driver.


Requirement Value
Header mountmgr.h (include Mountmgr.h)

See also