119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
/** @file
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Function that deletes a file.
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Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "Fat.h"
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/**
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Deletes the file & Closes the file handle.
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@param FHand - Handle to the file to delete.
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@retval EFI_SUCCESS - Delete the file successfully.
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@retval EFI_WARN_DELETE_FAILURE - Fail to delete the file.
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**/
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EFI_STATUS
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EFIAPI
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FatDelete (
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IN EFI_FILE_PROTOCOL *FHand
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)
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{
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FAT_IFILE *IFile;
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FAT_OFILE *OFile;
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FAT_DIRENT *DirEnt;
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EFI_STATUS Status;
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UINTN Round;
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IFile = IFILE_FROM_FHAND (FHand);
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OFile = IFile->OFile;
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FatWaitNonblockingTask (IFile);
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//
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// Lock the volume
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//
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FatAcquireLock ();
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//
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// If the file is read-only, then don't delete it
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//
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if (IFile->ReadOnly) {
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Status = EFI_WRITE_PROTECTED;
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goto Done;
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}
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//
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// If the file is the root dir, then don't delete it
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//
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if (OFile->Parent == NULL) {
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Status = EFI_ACCESS_DENIED;
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goto Done;
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}
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//
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// If the file has a permanant error, skip the delete
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//
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Status = OFile->Error;
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if (!EFI_ERROR (Status)) {
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//
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// If this is a directory, make sure it's empty before
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// allowing it to be deleted
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//
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if (OFile->ODir != NULL) {
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//
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// We do not allow to delete nonempty directory
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//
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FatResetODirCursor (OFile);
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for (Round = 0; Round < 3; Round++) {
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Status = FatGetNextDirEnt (OFile, &DirEnt);
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if ((EFI_ERROR (Status)) ||
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((Round < 2) && (DirEnt == NULL || !FatIsDotDirEnt (DirEnt))) ||
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((Round == 2) && (DirEnt != NULL))
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) {
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Status = EFI_ACCESS_DENIED;
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goto Done;
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}
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}
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}
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//
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// Return the file's space by setting its size to 0
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//
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FatTruncateOFile (OFile, 0);
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//
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// Free the directory entry for this file
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//
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Status = FatRemoveDirEnt (OFile->Parent, OFile->DirEnt);
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if (EFI_ERROR (Status)) {
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goto Done;
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}
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//
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// Set a permanent error for this OFile in case there
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// are still opened IFiles attached
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//
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OFile->Error = EFI_NOT_FOUND;
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} else if (OFile->Error == EFI_NOT_FOUND) {
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Status = EFI_SUCCESS;
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}
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Done:
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//
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// Always close the handle
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//
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FatIFileClose (IFile);
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//
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// Done
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//
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Status = FatCleanupVolume (OFile->Volume, NULL, Status, NULL);
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FatReleaseLock ();
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if (EFI_ERROR (Status)) {
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Status = EFI_WARN_DELETE_FAILURE;
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}
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return Status;
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}
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