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/** @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;
}
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