OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_GETATTR

Add the VirtioFsFuseGetAttr() function, for sending the FUSE_GETATTR
command to the Virtio Filesystem device.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201216211125.19496-26-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>

OvmfPkg/VirtioFsDxe/VirtioFsDxe.h

@@ -259,6 +259,13 @@ VirtioFsFuseForget (
   IN     UINT64    NodeId
   );
 
+EFI_STATUS
+VirtioFsFuseGetAttr (
+  IN OUT VIRTIO_FS                          *VirtioFs,
+  IN     UINT64                             NodeId,
+     OUT VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr
+  );
+
 EFI_STATUS
 VirtioFsFuseMkDir (
   IN OUT VIRTIO_FS *VirtioFs,