audk/MdePkg/Include/Guid/FileSystemInfo.h

/** @file
  Provides a GUID and a data structure that can be used with EFI_FILE_PROTOCOL.GetInfo()
  or EFI_FILE_PROTOCOL.SetInfo() to get or set information about the system's volume.
  This guid is defined in UEFI specification.

  Copyright (c) 2006 - 2008, Intel Corporation                                                         
  All rights reserved. This program and the accompanying materials                          
  are licensed and made available under the terms and conditions of the BSD License         
  which accompanies this distribution.  The full text of the license may be found at        
  http://opensource.org/licenses/bsd-license.php                                            

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             

**/

#ifndef __FILE_SYSTEM_INFO_H__
#define __FILE_SYSTEM_INFO_H__

#define EFI_FILE_SYSTEM_INFO_ID \
  { \
    0x9576e93, 0x6d3f, 0x11d2, {0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
  }

typedef struct {
  ///
  /// Size of the EFI_FILE_SYSTEM_INFO structure, including the Null-terminated Unicode VolumeLabel string.
  ///
  UINT64  Size;
  ///
  /// TRUE if the volume only supports read access.
  ///
  BOOLEAN ReadOnly;
  ///
  /// The number of bytes managed by the file system.
  ///
  UINT64  VolumeSize;
  ///
  /// The number of available bytes for use by the file system.
  ///
  UINT64  FreeSpace;
  ///
  /// The nominal block size by which files are typically grown.
  ///
  UINT32  BlockSize;
  ///
  /// The Null-terminated string that is the volume's label.
  ///
  CHAR16  VolumeLabel[1];
} EFI_FILE_SYSTEM_INFO;

///
/// The VolumeLabel field of the EFI_FILE_SYSTEM_INFO data structure is variable length.
/// Whenever code needs to know the size of the EFI_FILE_SYSTEM_INFO data structure, it needs
/// to be the size of the data structure without the VolumeLable field.  The following macro
/// computes this size correctly no matter how big the VolumeLable array is declared.
/// This is required to make the EFI_FILE_SYSTEM_INFO data structure ANSI compilant.
///
#define SIZE_OF_EFI_FILE_SYSTEM_INFO  EFI_FIELD_OFFSET (EFI_FILE_SYSTEM_INFO, VolumeLabel)

extern EFI_GUID gEfiFileSystemInfoGuid;

#endif