#ifndef _NTIOAPI_H

// Output structure for IOCTL_MOUNTMGR_DELETE_POINTS, IOCTL_MOUNTMGR_QUERY_POINTS, and IOCTL_MOUNTMGR_DELETE_POINTS_DBONLY.
typedef struct _MOUNTMGR_MOUNT_POINTS
{
    ULONG Size;
    ULONG NumberOfMountPoints;
    _Field_size_(NumberOfMountPoints) MOUNTMGR_MOUNT_POINT MountPoints[1];
} MOUNTMGR_MOUNT_POINTS, *PMOUNTMGR_MOUNT_POINTS;

#endif
View code on GitHub

// mountmgr.h

typedef struct _MOUNTMGR_MOUNT_POINTS {
  ULONG                Size;
  ULONG                NumberOfMountPoints;
  MOUNTMGR_MOUNT_POINT MountPoints[1];
} MOUNTMGR_MOUNT_POINTS, *PMOUNTMGR_MOUNT_POINTS;
View the official Windows Driver Kit DDI reference

NtDoc

This structure is documented in Windows Driver Kit.

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Windows Driver Kit DDI reference (ns-mountmgr-_mountmgr_mount_points)

Description

The MOUNTMGR_MOUNT_POINTS structure is used by mount manager to send a client the list of mount points associated with a device.

Members

`Size`

Contains the size, in bytes, of the output buffer.

`NumberOfMountPoints`

Contains the number of mount points that the mount manager is returning.

`MountPoints`

Contains an array of MOUNTMGR_MOUNT_POINT structures that contain information about each mount point associated with the device.

Remarks

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

MOUNTMGR_MOUNT_POINTS - NtDoc