FuseGetAttr.c

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#include "VirtioFsDxe.h"
 
EFI_STATUS
VirtioFsFuseGetAttr (
  IN OUT VIRTIO_FS                        *VirtioFs,
  IN     UINT64                           NodeId,
  OUT VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE  *FuseAttr
  )
{
  VIRTIO_FS_FUSE_REQUEST           CommonReq;
  VIRTIO_FS_FUSE_GETATTR_REQUEST   GetAttrReq;
  VIRTIO_FS_IO_VECTOR              ReqIoVec[2];
  VIRTIO_FS_SCATTER_GATHER_LIST    ReqSgList;
  VIRTIO_FS_FUSE_RESPONSE          CommonResp;
  VIRTIO_FS_FUSE_GETATTR_RESPONSE  GetAttrResp;
  VIRTIO_FS_IO_VECTOR              RespIoVec[3];
  VIRTIO_FS_SCATTER_GATHER_LIST    RespSgList;
  EFI_STATUS                       Status;
 
  //
  // Set up the scatter-gather lists.
  //
  ReqIoVec[0].Buffer = &CommonReq;
  ReqIoVec[0].Size   = sizeof CommonReq;
  ReqIoVec[1].Buffer = &GetAttrReq;
  ReqIoVec[1].Size   = sizeof GetAttrReq;
  ReqSgList.IoVec    = ReqIoVec;
  ReqSgList.NumVec   = ARRAY_SIZE (ReqIoVec);
 
  RespIoVec[0].Buffer = &CommonResp;
  RespIoVec[0].Size   = sizeof CommonResp;
  RespIoVec[1].Buffer = &GetAttrResp;
  RespIoVec[1].Size   = sizeof GetAttrResp;
  RespIoVec[2].Buffer = FuseAttr;
  RespIoVec[2].Size   = sizeof *FuseAttr;
  RespSgList.IoVec    = RespIoVec;
  RespSgList.NumVec   = ARRAY_SIZE (RespIoVec);
 
  //
  // Validate the scatter-gather lists; calculate the total transfer sizes.
  //
  Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, &RespSgList);
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  //
  // Populate the common request header.
  //
  Status = VirtioFsFuseNewRequest (
             VirtioFs,
             &CommonReq,
             ReqSgList.TotalSize,
             VirtioFsFuseOpGetAttr,
             NodeId
             );
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  //
  // Populate the FUSE_GETATTR-specific fields.
  //
  GetAttrReq.GetAttrFlags = 0;
  GetAttrReq.Dummy        = 0;
  GetAttrReq.FileHandle   = 0;
 
  //
  // Submit the request.
  //
  Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, &RespSgList);
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  //
  // Verify the response (all response buffers are fixed size).
  //
  Status = VirtioFsFuseCheckResponse (&RespSgList, CommonReq.Unique, NULL);
  if (Status == EFI_DEVICE_ERROR) {
    DEBUG ((
      DEBUG_ERROR,
      "%a: Label=\"%s\" NodeId=%Lu Errno=%d\n",
      __func__,
      VirtioFs->Label,
      NodeId,
      CommonResp.Error
      ));
    Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
  }
 
  return Status;
}