1 /** @file 2 Function that deletes a file. 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 16 #include "Fat.h" 17 18 /** 19 20 Deletes the file & Closes the file handle. 21 22 @param FHand - Handle to the file to delete. 23 24 @retval EFI_SUCCESS - Delete the file successfully. 25 @retval EFI_WARN_DELETE_FAILURE - Fail to delete the file. 26 27 **/ 28 EFI_STATUS 29 EFIAPI 30 FatDelete ( 31 IN EFI_FILE_PROTOCOL *FHand 32 ) 33 { 34 FAT_IFILE *IFile; 35 FAT_OFILE *OFile; 36 FAT_DIRENT *DirEnt; 37 EFI_STATUS Status; 38 UINTN Round; 39 40 IFile = IFILE_FROM_FHAND (FHand); 41 OFile = IFile->OFile; 42 43 FatWaitNonblockingTask (IFile); 44 45 // 46 // Lock the volume 47 // 48 FatAcquireLock (); 49 50 // 51 // If the file is read-only, then don't delete it 52 // 53 if (IFile->ReadOnly) { 54 Status = EFI_WRITE_PROTECTED; 55 goto Done; 56 } 57 // 58 // If the file is the root dir, then don't delete it 59 // 60 if (OFile->Parent == NULL) { 61 Status = EFI_ACCESS_DENIED; 62 goto Done; 63 } 64 // 65 // If the file has a permanant error, skip the delete 66 // 67 Status = OFile->Error; 68 if (!EFI_ERROR (Status)) { 69 // 70 // If this is a directory, make sure it's empty before 71 // allowing it to be deleted 72 // 73 if (OFile->ODir != NULL) { 74 // 75 // We do not allow to delete nonempty directory 76 // 77 FatResetODirCursor (OFile); 78 for (Round = 0; Round < 3; Round++) { 79 Status = FatGetNextDirEnt (OFile, &DirEnt); 80 if ((EFI_ERROR (Status)) || 81 ((Round < 2) && (DirEnt == NULL || !FatIsDotDirEnt (DirEnt))) || 82 ((Round == 2) && (DirEnt != NULL)) 83 ) { 84 Status = EFI_ACCESS_DENIED; 85 goto Done; 86 } 87 } 88 } 89 // 90 // Return the file's space by setting its size to 0 91 // 92 FatTruncateOFile (OFile, 0); 93 // 94 // Free the directory entry for this file 95 // 96 Status = FatRemoveDirEnt (OFile->Parent, OFile->DirEnt); 97 if (EFI_ERROR (Status)) { 98 goto Done; 99 } 100 // 101 // Set a permanent error for this OFile in case there 102 // are still opened IFiles attached 103 // 104 OFile->Error = EFI_NOT_FOUND; 105 } else if (OFile->Error == EFI_NOT_FOUND) { 106 Status = EFI_SUCCESS; 107 } 108 109 Done: 110 // 111 // Always close the handle 112 // 113 FatIFileClose (IFile); 114 // 115 // Done 116 // 117 Status = FatCleanupVolume (OFile->Volume, NULL, Status, NULL); 118 FatReleaseLock (); 119 120 if (EFI_ERROR (Status)) { 121 Status = EFI_WARN_DELETE_FAILURE; 122 } 123 124 return Status; 125 } 126
