1 files changed, 58 insertions, 0 deletions
diff --git a/roms/edk2/FatPkg/EnhancedFatDxe/OpenVolume.c b/roms/edk2/FatPkg/EnhancedFatDxe/OpenVolume.c
new file mode 100644
index 000000000..16038468a
--- /dev/null
+++ b/roms/edk2/FatPkg/EnhancedFatDxe/OpenVolume.c
@@ -0,0 +1,58 @@
+/** @file
+  OpenVolume() function of Simple File System Protocol.
+
+Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "Fat.h"
+
+/**
+
+  Implements Simple File System Protocol interface function OpenVolume().
+
+  @param  This                  - Calling context.
+  @param  File                  - the Root Directory of the volume.
+
+  @retval EFI_OUT_OF_RESOURCES  - Can not allocate the memory.
+  @retval EFI_VOLUME_CORRUPTED  - The FAT type is error.
+  @retval EFI_SUCCESS           - Open the volume successfully.
+
+**/
+EFI_STATUS
+EFIAPI
+FatOpenVolume (
+  IN  EFI_SIMPLE_FILE_SYSTEM_PROTOCOL  *This,
+  OUT EFI_FILE_PROTOCOL                **File
+  )
+{
+  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;
+}