Kill off unused request() method in data-xfer interface.

src/core/downloader.c

 static struct xfer_interface_operations downloader_xfer_operations = {
 	.close		= downloader_xfer_close,
 	.vredirect	= xfer_vopen,
-	.request	= ignore_xfer_request,
 	.seek		= downloader_xfer_seek,
 	.deliver_iob	= xfer_deliver_as_raw,
 	.deliver_raw	= downloader_xfer_deliver_raw,

src/core/hw.c

 static struct xfer_interface_operations hw_xfer_operations = {
 	.close		= hw_xfer_close,
 	.vredirect	= ignore_xfer_vredirect,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.deliver_iob	= xfer_deliver_as_raw,
 	.deliver_raw	= ignore_xfer_deliver_raw,

src/core/posix_io.c

 static struct xfer_interface_operations posix_file_xfer_operations = {
 	.close		= posix_file_xfer_close,
 	.vredirect	= xfer_vopen,
-	.request	= ignore_xfer_request,
 	.seek		= posix_file_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= posix_file_xfer_deliver_iob,

src/core/resolv.c

 static struct xfer_interface_operations named_xfer_ops = {
 	.close		= ignore_xfer_close,
 	.vredirect	= ignore_xfer_vredirect,
-	.request	= ignore_xfer_request,
 	.seek		= resolv_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= xfer_deliver_as_raw,

src/core/xfer.c

 	return rc;
 }
 
-/**
- * Request data
- *
- * @v xfer		Data transfer interface
- * @v offset		Offset to new position
- * @v whence		Basis for new position
- * @v len		Length of requested data
- * @ret rc		Return status code
- */
-int xfer_request ( struct xfer_interface *xfer, off_t offset, int whence,
-		   size_t len ) {
-	struct xfer_interface *dest = xfer_get_dest ( xfer );
-	int rc;
-
-	DBGC ( xfer, "XFER %p->%p request %s+%ld %zd\n", xfer, dest,
-	       whence_text ( whence ), offset, len );
-
-	rc = dest->op->request ( dest, offset, whence, len );
-
-	if ( rc != 0 ) {
-		DBGC ( xfer, "XFER %p<-%p request: %s\n", xfer, dest,
-		       strerror ( rc ) );
-	}
-	xfer_put ( dest );
-	return rc;
-}
-
 /**
  * Seek to position
  *
 	return 0;
 }
 
-/**
- * Ignore request() event
- *
- * @v xfer		Data transfer interface
- * @v offset		Offset to new position
- * @v whence		Basis for new position
- * @v len		Length of requested data
- * @ret rc		Return status code
- */
-int ignore_xfer_request ( struct xfer_interface *xfer __unused,
-			  off_t offset __unused, int whence __unused, 
-			  size_t len __unused ) {
-	return 0;
-}
-
 /**
  * Ignore seek() event
  *
 struct xfer_interface_operations null_xfer_ops = {
 	.close		= ignore_xfer_close,
 	.vredirect	= ignore_xfer_vredirect,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= xfer_deliver_as_raw,

src/include/gpxe/xfer.h

 	 */
 	int ( * vredirect ) ( struct xfer_interface *xfer, int type,
 			      va_list args );
-	/** Request data
-	 *
-	 * @v xfer		Data transfer interface
-	 * @v offset		Offset to new position
-	 * @v whence		Basis for new position
-	 * @v len		Length of requested data
-	 * @ret rc		Return status code
-	 */
-	int ( * request ) ( struct xfer_interface *xfer, off_t offset,
-			    int whence, size_t len );
 	/** Seek to position
 	 *
 	 * @v xfer		Data transfer interface
 extern int xfer_vredirect ( struct xfer_interface *xfer, int type,
 			    va_list args );
 extern int xfer_redirect ( struct xfer_interface *xfer, int type, ... );
-extern int xfer_request ( struct xfer_interface *xfer, off_t offset,
-			  int whence, size_t len );
 extern int xfer_seek ( struct xfer_interface *xfer, off_t offset, int whence );
 extern int xfer_ready ( struct xfer_interface *xfer );
 extern struct io_buffer * xfer_alloc_iob ( struct xfer_interface *xfer,
 extern void ignore_xfer_close ( struct xfer_interface *xfer, int rc );
 extern int ignore_xfer_vredirect ( struct xfer_interface *xfer,
 				   int type, va_list args );
-extern int ignore_xfer_request ( struct xfer_interface *xfer, off_t offset,
-				 int whence, size_t len );
 extern int ignore_xfer_seek ( struct xfer_interface *xfer, off_t offset,
 			      int whence );
 extern struct io_buffer * default_xfer_alloc_iob ( struct xfer_interface *xfer,

src/interface/pxe/pxe_udp.c

 static struct xfer_interface_operations pxe_udp_xfer_operations = {
 	.close		= ignore_xfer_close,
 	.vredirect	= ignore_xfer_vredirect,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= pxe_udp_deliver_iob,

src/net/tcp.c

 static struct xfer_interface_operations tcp_xfer_operations = {
 	.close		= tcp_xfer_close,
 	.vredirect	= ignore_xfer_vredirect,
-	.request	= ignore_xfer_request,
 	.seek		= tcp_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= tcp_xfer_deliver_iob,

src/net/tcp/ftp.c

 static struct xfer_interface_operations ftp_control_operations = {
 	.close		= ftp_control_close,
 	.vredirect	= xfer_vopen,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= xfer_deliver_as_raw,
 static struct xfer_interface_operations ftp_data_operations = {
 	.close		= ftp_data_closed,
 	.vredirect	= xfer_vopen,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= ftp_data_deliver_iob,
 static struct xfer_interface_operations ftp_xfer_operations = {
 	.close		= ftp_xfer_closed,
 	.vredirect	= ignore_xfer_vredirect,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= xfer_deliver_as_raw,

src/net/tcp/http.c

 static struct xfer_interface_operations http_socket_operations = {
 	.close		= http_socket_close,
 	.vredirect	= xfer_vopen,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= http_socket_deliver_iob,
 static struct xfer_interface_operations http_xfer_operations = {
 	.close		= http_xfer_close,
 	.vredirect	= ignore_xfer_vredirect,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= xfer_deliver_as_raw,

src/net/udp.c

 static struct xfer_interface_operations udp_xfer_operations = {
 	.close		= udp_xfer_close,
 	.vredirect	= ignore_xfer_vredirect,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= udp_alloc_iob,
 	.deliver_iob	= udp_xfer_deliver_iob,

src/net/udp/dhcp.c

 static struct xfer_interface_operations dhcp_xfer_operations = {
 	.close		= ignore_xfer_close,
 	.vredirect	= xfer_vopen,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.deliver_iob	= xfer_deliver_as_raw,
 	.deliver_raw	= dhcp_deliver_raw,

src/net/udp/dns.c

 static struct xfer_interface_operations dns_socket_operations = {
 	.close		= dns_xfer_close,
 	.vredirect	= xfer_vopen,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= xfer_deliver_as_raw,

src/net/udp/tftp.c

 static struct xfer_interface_operations tftp_socket_operations = {
 	.close		= tftp_socket_close,
 	.vredirect	= xfer_vopen,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= tftp_socket_deliver_iob,
 static struct xfer_interface_operations tftp_xfer_operations = {
 	.close		= tftp_xfer_close,
 	.vredirect	= ignore_xfer_vredirect,
-	.request	= ignore_xfer_request,
 	.seek		= ignore_xfer_seek,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= xfer_deliver_as_raw,