CloverBootloader/FileSystems/FatPkg/EnhancedFatDxe/OpenVolume.c

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/*++
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;
}