1 /** @file 2 OpenVolume() function of Simple File System Protocol. 3 4 Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials are licensed and made available 6 under the terms and conditions of the BSD License which accompanies this 7 distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 #include "Fat.h" 16 17 /** 18 19 Implements Simple File System Protocol interface function OpenVolume(). 20 21 @param This - Calling context. 22 @param File - the Root Directory of the volume. 23 24 @retval EFI_OUT_OF_RESOURCES - Can not allocate the memory. 25 @retval EFI_VOLUME_CORRUPTED - The FAT type is error. 26 @retval EFI_SUCCESS - Open the volume successfully. 27 28 **/ 29 EFI_STATUS 30 EFIAPI 31 FatOpenVolume ( 32 IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *This, 33 OUT EFI_FILE_PROTOCOL **File 34 ) 35 { 36 EFI_STATUS Status; 37 FAT_VOLUME *Volume; 38 FAT_IFILE *IFile; 39 40 Volume = VOLUME_FROM_VOL_INTERFACE (This); 41 FatAcquireLock (); 42 43 // 44 // Open Root file 45 // 46 Status = FatOpenDirEnt (NULL, &Volume->RootDirEnt); 47 if (EFI_ERROR (Status)) { 48 goto Done; 49 } 50 // 51 // Open a new instance to the root 52 // 53 Status = FatAllocateIFile (Volume->Root, &IFile); 54 if (!EFI_ERROR (Status)) { 55 *File = &IFile->Handle; 56 } 57 58 Done: 59 60 Status = FatCleanupVolume (Volume, Volume->Root, Status, NULL); 61 FatReleaseLock (); 62 63 return Status; 64 } 65
