FuseRename.c

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#include <Library/BaseLib.h> // AsciiStrSize()
 
#include "VirtioFsDxe.h"
 
EFI_STATUS
VirtioFsFuseRename (
  IN OUT VIRTIO_FS  *VirtioFs,
  IN     UINT64     OldParentNodeId,
  IN     CHAR8      *OldName,
  IN     UINT64     NewParentNodeId,
  IN     CHAR8      *NewName
  )
{
  VIRTIO_FS_FUSE_REQUEST          CommonReq;
  VIRTIO_FS_FUSE_RENAME2_REQUEST  Rename2Req;
  VIRTIO_FS_IO_VECTOR             ReqIoVec[4];
  VIRTIO_FS_SCATTER_GATHER_LIST   ReqSgList;
  VIRTIO_FS_FUSE_RESPONSE         CommonResp;
  VIRTIO_FS_IO_VECTOR             RespIoVec[1];
  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 = &Rename2Req;
  ReqIoVec[1].Size   = sizeof Rename2Req;
  ReqIoVec[2].Buffer = OldName;
  ReqIoVec[2].Size   = AsciiStrSize (OldName);
  ReqIoVec[3].Buffer = NewName;
  ReqIoVec[3].Size   = AsciiStrSize (NewName);
  ReqSgList.IoVec    = ReqIoVec;
  ReqSgList.NumVec   = ARRAY_SIZE (ReqIoVec);
 
  RespIoVec[0].Buffer = &CommonResp;
  RespIoVec[0].Size   = sizeof CommonResp;
  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,
             VirtioFsFuseOpRename2,
             OldParentNodeId
             );
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  //
  // Populate the FUSE_RENAME2-specific fields.
  //
  Rename2Req.NewDir  = NewParentNodeId;
  Rename2Req.Flags   = VIRTIO_FS_FUSE_RENAME2_REQ_F_NOREPLACE;
  Rename2Req.Padding = 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\" OldParentNodeId=%Lu OldName=\"%a\" "
      "NewParentNodeId=%Lu NewName=\"%a\" Errno=%d\n",
      __func__,
      VirtioFs->Label,
      OldParentNodeId,
      OldName,
      NewParentNodeId,
      NewName,
      CommonResp.Error
      ));
    Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
  }
 
  return Status;
}