Introduce the Xen 9pfs transport header

Define the ring according to the protocol specification, using the new
DEFINE_XEN_FLEX_RING_AND_INTF macro.

Add the header to the C99 check.

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: JBeulich@suse.com

xen/include/Makefile

@@ -94,9 +94,11 @@ all: headers.chk headers99.chk headers++.chk
 
 PUBLIC_HEADERS := $(filter-out public/arch-% public/dom0_ops.h, $(wildcard public/*.h public/*/*.h) $(public-y))
 
-PUBLIC_C99_HEADERS :=
+PUBLIC_C99_HEADERS := public/io/9pfs.h
 PUBLIC_ANSI_HEADERS := $(filter-out public/%ctl.h public/xsm/% public/%hvm/save.h $(PUBLIC_C99_HEADERS), $(PUBLIC_HEADERS))
 
+public/io/9pfs.h-prereq := string
+
 headers.chk: $(PUBLIC_ANSI_HEADERS) Makefile
 	for i in $(filter %.h,$^); do \
 	    $(CC) -x c -ansi -Wall -Werror -include stdint.h \

xen/include/public/io/9pfs.h

@@ -0,0 +1,49 @@
+/*
+ * 9pfs.h -- Xen 9PFS transport
+ *
+ * Refer to docs/misc/9pfs.markdown for the specification
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Copyright (C) 2017 Stefano Stabellini <stefano@aporeto.com>
+ */
+
+#ifndef __XEN_PUBLIC_IO_9PFS_H__
+#define __XEN_PUBLIC_IO_9PFS_H__
+
+#include "../grant_table.h"
+#include "ring.h"
+
+/*
+ * See docs/misc/9pfs.markdown in xen.git for the full specification:
+ * https://xenbits.xen.org/docs/unstable/misc/9pfs.html
+ */
+DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
+
+#endif
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */