OvmfPkg/VirtioFsDxe: add EFI_FILE_INFO cache fields to VIRTIO_FS_FILE

[mirror_edk2.git] / OvmfPkg / VirtioFsDxe / SimpleFsSetPosition.c

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