#ifndef _NTIOAPI_H

// Output structure for IOCTL_MOUNTDEV_QUERY_DEVICE_NAME.
typedef struct _MOUNTDEV_NAME
{
    USHORT NameLength;
    _Field_size_bytes_(NameLength) WCHAR Name[1];
} MOUNTDEV_NAME, *PMOUNTDEV_NAME;

#endif
View code on GitHub

// mountmgr.h

typedef struct _MOUNTDEV_NAME {
  USHORT NameLength;
  WCHAR  Name[1];
} MOUNTDEV_NAME, *PMOUNTDEV_NAME;
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-_mountdev_name)

Description

The MOUNTDEV_NAME structure holds the name of a device.

Members

`NameLength`

Contains the length of the name, in bytes.

`Name`

Contains a variable-sized array of wide characters that holds the name of the device mount point. The name may be a nonpersistent target name such as "\Device\HarddiskVolume1", a persistent symbolic link name such as a drive letter, "\DosDevices\D:", or a mount point such as "\DosDevices\E:\FilesysD\mnt".

Remarks

As a best practice, the implementer must not thread-synchronize and must not make blocking and/or Interprocess Communication (IPC) function calls.

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

MOUNTDEV_NAME - NtDoc