MdePkg/Include: Add STATIC_ASSERT for L'' and L"" strings

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

/** @file\r
  FUSE_STATFS wrapper for the Virtio Filesystem device.\r
\r
  Copyright (C) 2020, Red Hat, Inc.\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
**/\r
\r
#include "VirtioFsDxe.h"\r
\r
/**\r
  Send the FUSE_STATFS request to the Virtio Filesysem device, for retrieving\r
  the attributes of the host-side filesystem that contains NodeId.\r
\r
  The function may only be called after VirtioFsFuseInitSession() returns\r
  successfully and before VirtioFsUninit() is called.\r
\r
  @param[in,out] VirtioFs  The Virtio Filesystem device to send the FUSE_STATFS\r
                           request to. On output, the FUSE request counter\r
                           "VirtioFs->RequestId" will have been incremented.\r
\r
  @param[in] NodeId        The inode whose containing filesystem is to be\r
                           queried for its attributes.\r
\r
  @param[out] FilesysAttr  The VIRTIO_FS_FUSE_STATFS_RESPONSE object describing\r
                           the filesystem that underlies NodeId.\r
\r
  @retval EFI_SUCCESS  FilesysAttr has been filled in.\r
\r
  @return              The "errno" value mapped to an EFI_STATUS code, if the\r
                       Virtio Filesystem device explicitly reported an error.\r
\r
  @return              Error codes propagated from VirtioFsSgListsValidate(),\r
                       VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit(),\r
                       VirtioFsFuseCheckResponse().\r
**/\r
EFI_STATUS\r
VirtioFsFuseStatFs (\r
  IN OUT VIRTIO_FS                      *VirtioFs,\r
  IN     UINT64                         NodeId,\r
     OUT VIRTIO_FS_FUSE_STATFS_RESPONSE *FilesysAttr\r
     )\r
{\r
  VIRTIO_FS_FUSE_REQUEST        CommonReq;\r
  VIRTIO_FS_IO_VECTOR           ReqIoVec[1];\r
  VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;\r
  VIRTIO_FS_FUSE_RESPONSE       CommonResp;\r
  VIRTIO_FS_IO_VECTOR           RespIoVec[2];\r
  VIRTIO_FS_SCATTER_GATHER_LIST RespSgList;\r
  EFI_STATUS                    Status;\r
\r
  //\r
  // Set up the scatter-gather lists.\r
  //\r
  ReqIoVec[0].Buffer = &CommonReq;\r
  ReqIoVec[0].Size   = sizeof CommonReq;\r
  ReqSgList.IoVec    = ReqIoVec;\r
  ReqSgList.NumVec   = ARRAY_SIZE (ReqIoVec);\r
\r
  RespIoVec[0].Buffer = &CommonResp;\r
  RespIoVec[0].Size   = sizeof CommonResp;\r
  RespIoVec[1].Buffer = FilesysAttr;\r
  RespIoVec[1].Size   = sizeof *FilesysAttr;\r
  RespSgList.IoVec    = RespIoVec;\r
  RespSgList.NumVec   = ARRAY_SIZE (RespIoVec);\r
\r
  //\r
  // Validate the scatter-gather lists; calculate the total transfer sizes.\r
  //\r
  Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, &RespSgList);\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Populate the common request header.\r
  //\r
  Status = VirtioFsFuseNewRequest (VirtioFs, &CommonReq, ReqSgList.TotalSize,\r
             VirtioFsFuseOpStatFs, NodeId);\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Submit the request.\r
  //\r
  Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, &RespSgList);\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Verify the response (all response buffers are fixed size).\r
  //\r
  Status = VirtioFsFuseCheckResponse (&RespSgList, CommonReq.Unique, NULL);\r
  if (Status == EFI_DEVICE_ERROR) {\r
    DEBUG ((DEBUG_ERROR, "%a: Label=\"%s\" NodeId=%Lu Errno=%d\n",\r
      __FUNCTION__, VirtioFs->Label, NodeId, CommonResp.Error));\r
    Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);\r
  }\r
  return Status;\r
}\r