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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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