[edk2] INVALID PARAMETER when opening a file for writing

[miguelro...@ua.pt]

Hello all,

I'm getting an error when trying to open a file for writing. I have no problems 
when I open the same file with read permissions.

I'm using the following code:

EFI_FILE_IO_INTERFACE *
get_io_interface(EFI_HANDLE image)
{
        EFI_STATUS status;
        EFI_HANDLE loadedImHandle;
        EFI_FILE_IO_INTERFACE * vol;
         EFI_LOADED_IMAGE *li;

         status = uefi_call_wrapper( BS->HandleProtocol, 3,
                         image, &LoadedImageProtocol, (void **) &li);

         if( status != EFI_SUCCESS ) return NULL;

         loadedImHandle = li->DeviceHandle;

        status = uefi_call_wrapper( BS->HandleProtocol, 3,
                         loadedImHandle, &FileSystemProtocol,
                         (void **)&vol );

        if(status != EFI_SUCCESS) return NULL;

         return vol;
}

        EFI_FILE_HANDLE 
get_file_handle(EFI_HANDLE image, UINT64 mode)
{
        EFI_STATUS status;
         EFI_FILE_IO_INTERFACE * vol;
        EFI_FILE_HANDLE root;
        EFI_FILE_HANDLE fp;

        vol = get_io_interface(image);

        if( vol == NULL) return NULL;

        status = uefi_call_wrapper( vol->OpenVolume, 2,
                        vol, &root);

        if( status != EFI_SUCCESS ) return NULL;

        status = uefi_call_wrapper( root->Open, 5,
                        root, &fp, ticket_file,
                        mode, 0 );

        Print(L"Open=%d\n", status); // I get status = 2 (INVALID_PARAMETER)

        if( status != EFI_SUCCESS ) return NULL;

        return fp;
}

// pseudo-code
EFI_STATUS
efi_main(EFI_HANDLE image)
{
    //....

   get_file_handle (image, EFI_FILE_MODE_WRITE);

}

(#define EFI_FILE_MODE_WRITE     0x0000000000000002)

I'm using GNUEFI lib.

Am I missing something or Ovmf does not support file writing?

Regards,
 Miguel Rocha

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