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Message-Id: <1255501805.6047.1192.camel@yhuang-dev.sh.intel.com>
Date: Wed, 14 Oct 2009 14:30:05 +0800
From: Huang Ying <ying.huang@...el.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Joe Perches <joe@...ches.com>,
Steven Whitehouse <swhiteho@...hat.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [RFC 1/2] Unified UUID/GUID definition
There are many different UUID/GUID definitions in kernel, such as that
in EFI, many file systems, some drivers, etc. Every kernel components
need UUID/GUID has its own definition. This patch provides a unified
definition for UUID/GUID.
UUID is defined via typedef. This makes that UUID appears more like a
preliminary type, and makes the data type explicit (comparing with
implicit "u8 uuid[16]").
The binary representation of UUID/GUID can be little-endian (used by
EFI, etc) or big-endian (defined by RFC4122), so both is defined.
Signed-off-by: Huang Ying <ying.huang@...el.com>
---
include/linux/uuid.h | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++
lib/Makefile | 2 -
lib/uuid.c | 36 +++++++++++++++++++++++++++++++
3 files changed, 96 insertions(+), 1 deletion(-)
create mode 100644 include/linux/uuid.h
create mode 100644 lib/uuid.c
--- /dev/null
+++ b/include/linux/uuid.h
@@ -0,0 +1,59 @@
+/*
+ * Unified UUID/GUID definition
+ *
+ * Copyright (C) 2009, Intel Corp.
+ * Huang Ying <ying.huang@...el.com>
+ *
+ * This file is released under the GPLv2.
+ */
+
+#ifndef _LINUX_UUID_H_
+#define _LINUX_UUID_H_
+
+#include <linux/types.h>
+#include <linux/string.h>
+
+typedef struct {
+ __u8 b[16];
+} uuid_le;
+
+typedef struct {
+ __u8 b[16];
+} uuid_be;
+
+#define UUID_LE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
+((uuid_le) \
+{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
+ (b) & 0xff, ((b) >> 8) & 0xff, \
+ (c) & 0xff, ((c) >> 8) & 0xff, \
+ (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
+
+#define UUID_BE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
+((uuid_be) \
+{{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \
+ ((b) >> 8) & 0xff, (b) & 0xff, \
+ ((c) >> 8) & 0xff, (c) & 0xff, \
+ (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
+
+#define NULL_UUID_LE \
+ UUID_LE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \
+ 0x00, 0x00, 0x00, 0x00)
+
+#define NULL_UUID_BE \
+ UUID_BE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \
+ 0x00, 0x00, 0x00, 0x00)
+
+static inline int uuid_le_cmp(const uuid_le u1, const uuid_le u2)
+{
+ return memcmp(&u1, &u2, sizeof(uuid_le));
+}
+
+static inline int uuid_be_cmp(const uuid_be u1, const uuid_be u2)
+{
+ return memcmp(&u1, &u2, sizeof(uuid_be));
+}
+
+extern void uuid_le_gen(uuid_le *u);
+extern void uuid_be_gen(uuid_be *u);
+
+#endif
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -21,7 +21,7 @@ lib-y += kobject.o kref.o klist.o
obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
- string_helpers.o gcd.o
+ string_helpers.o gcd.o uuid.o
ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG
--- /dev/null
+++ b/lib/uuid.c
@@ -0,0 +1,36 @@
+/*
+ * Unified UUID/GUID definition
+ *
+ * Copyright (C) 2009, Intel Corp.
+ * Huang Ying <ying.huang@...el.com>
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/uuid.h>
+#include <linux/random.h>
+
+static void __uuid_gen_common(__u8 b[16])
+{
+ get_random_bytes(b, 16);
+ /* reversion 0b10 */
+ b[8] = (b[8] & 0x3F) | 0x80;
+}
+
+void uuid_le_gen(uuid_le *lu)
+{
+ __uuid_gen_common(lu->b);
+ /* version 4 : random generation */
+ lu->b[7] = (lu->b[7] & 0x0F) | 0x40;
+}
+EXPORT_SYMBOL_GPL(uuid_le_gen);
+
+void uuid_be_gen(uuid_be *bu)
+{
+ __uuid_gen_common(bu->b);
+ /* version 4 : random generation */
+ bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
+}
+EXPORT_SYMBOL_GPL(uuid_be_gen);
--
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