CloverBootloader/FileSystems/FatPkg/EnhancedFatDxe/OpenVolume.c

/*++

Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the Software
License Agreement which accompanies this distribution.


Module Name:

  OpenVolume.c

Abstract:

  OpenVolume() function of Simple File System Protocol

Revision History

--*/

#include "Fat.h"

EFI_STATUS
EFIAPI
FatOpenVolume (
  IN  EFI_SIMPLE_FILE_SYSTEM_PROTOCOL  *This,
  OUT EFI_FILE_PROTOCOL                **File
  )
/*++

Routine Description:

  Implements Simple File System Protocol interface function OpenVolume().

Arguments:

  This                  - Calling context.
  File                  - the Root Directory of the volume.

Returns:

  EFI_OUT_OF_RESOURCES  - Can not allocate the memory.
  EFI_VOLUME_CORRUPTED  - The FAT type is error.
  EFI_SUCCESS           - Open the volume successfully.

--*/
{
  EFI_STATUS  Status;
  FAT_VOLUME  *Volume;
  FAT_IFILE   *IFile;

  Volume = VOLUME_FROM_VOL_INTERFACE (This);
  FatAcquireLock ();

  //
  // Open Root file
  //
  Status = FatOpenDirEnt (NULL, &Volume->RootDirEnt);
  if (EFI_ERROR(Status)) {
    goto Done;
  }
  //
  // Open a new instance to the root
  //
  Status = FatAllocateIFile (Volume->Root, &IFile);
  if (!EFI_ERROR(Status)) {
    *File = &IFile->Handle;
  }

Done:

  Status = FatCleanupVolume (Volume, Volume->Root, Status, NULL);
  FatReleaseLock ();

  return Status;
}