#ifndef _NTIOAPI_H

typedef struct _FILE_FS_LABEL_INFORMATION
{
    ULONG VolumeLabelLength;
    _Field_size_bytes_(VolumeLabelLength) WCHAR VolumeLabel[1];
} FILE_FS_LABEL_INFORMATION, *PFILE_FS_LABEL_INFORMATION;

#endif
View code on GitHub

// ntddk.h

typedef struct _FILE_FS_LABEL_INFORMATION {
  ULONG VolumeLabelLength;
  WCHAR VolumeLabel[1];
} FILE_FS_LABEL_INFORMATION, *PFILE_FS_LABEL_INFORMATION;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ns-ntddk-_file_fs_label_information)

_FILE_FS_LABEL_INFORMATION structure

Description

The FILE_FS_LABEL_INFORMATION structure is used to set the label for a file system volume.

Members

`VolumeLabelLength`

Length, in bytes, of the name for the volume.

`VolumeLabel`

Name for the volume.

Remarks

This information can be set in either of the following ways:

Call FltSetVolumeInformation or ZwSetVolumeInformationFile, passing FileFsLabelInformation as the value of FileInformationClass and passing a caller-allocated, FILE_FS_LABEL_INFORMATION-structured buffer as the value of FileInformation.
Create an IRP with major function code IRP_MJ_SET_VOLUME_INFORMATION.

FILE_WRITE_DATA access to the volume is required to set this information.

The size of the buffer passed in the FileInformation parameter to FltSetVolumeInformation or ZwSetVolumeInformationFile must be at least sizeof (FILE_FS_LABEL_INFORMATION).

This structure must be aligned on a LONG (4-byte) boundary.

NTinternals.net (undocumented.ntinternals.net)

This structure is documented in Windows Driver Kit.

Structure is an input buffer for NtSetVolumeInformationFile call with information class FileFsLabelInformation.

VolumeLabelLength

Length of VolumeLabel array, in bytes.

VolumeLabel[1]

Label for specified volume.

Documented by

Bo Branten
Tomasz Nowak

FILE_FS_LABEL_INFORMATION - NtDoc