Convert the rpc_pipefs filesystem to the new internal mount API as the old one will be obsoleted and removed. This allows greater flexibility in communication of mount parameters between userspace, the VFS and the filesystem. See Documentation/filesystems/mount_api.txt for more information. Change-Id: I6828ffc0d947b3b012d7734bcd89626580b7d405 Signed-off-by: David Howells <dhowells@redhat.com> cc: Trond Myklebust <trond.myklebust@hammerspace.com> cc: Anna Schumaker <anna.schumaker@netapp.com> cc: "J. Bruce Fields" <bfields@fieldses.org> cc: Jeff Layton <jlayton@kernel.org> cc: linux-nfs@vger.kernel.org