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