/** @file | |
EFI_FILE_PROTOCOL.SetPosition() member function for the Virtio Filesystem | |
driver. | |
Copyright (C) 2020, Red Hat, Inc. | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include <Library/MemoryAllocationLib.h> // FreePool() | |
#include "VirtioFsDxe.h" | |
EFI_STATUS | |
EFIAPI | |
VirtioFsSimpleFileSetPosition ( | |
IN EFI_FILE_PROTOCOL *This, | |
IN UINT64 Position | |
) | |
{ | |
VIRTIO_FS_FILE *VirtioFsFile; | |
VIRTIO_FS *VirtioFs; | |
EFI_STATUS Status; | |
VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE FuseAttr; | |
VirtioFsFile = VIRTIO_FS_FILE_FROM_SIMPLE_FILE (This); | |
// | |
// Directories can only be rewound, per spec. | |
// | |
if (VirtioFsFile->IsDirectory) { | |
if (Position != 0) { | |
return EFI_UNSUPPORTED; | |
} | |
VirtioFsFile->FilePosition = 0; | |
if (VirtioFsFile->FileInfoArray != NULL) { | |
FreePool (VirtioFsFile->FileInfoArray); | |
VirtioFsFile->FileInfoArray = NULL; | |
} | |
VirtioFsFile->SingleFileInfoSize = 0; | |
VirtioFsFile->NumFileInfo = 0; | |
VirtioFsFile->NextFileInfo = 0; | |
return EFI_SUCCESS; | |
} | |
// | |
// Regular file. | |
// | |
if (Position < MAX_UINT64) { | |
// | |
// Caller is requesting absolute file position. | |
// | |
VirtioFsFile->FilePosition = Position; | |
return EFI_SUCCESS; | |
} | |
// | |
// Caller is requesting a seek to EOF. | |
// | |
VirtioFs = VirtioFsFile->OwnerFs; | |
Status = VirtioFsFuseGetAttr (VirtioFs, VirtioFsFile->NodeId, &FuseAttr); | |
if (EFI_ERROR (Status)) { | |
return Status; | |
} | |
VirtioFsFile->FilePosition = FuseAttr.Size; | |
return EFI_SUCCESS; | |
} |