From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755607AbZJNGa7 (ORCPT ); Wed, 14 Oct 2009 02:30:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755553AbZJNGa6 (ORCPT ); Wed, 14 Oct 2009 02:30:58 -0400 Received: from mga03.intel.com ([143.182.124.21]:52050 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754769AbZJNGa5 (ORCPT ); Wed, 14 Oct 2009 02:30:57 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.44,555,1249282800"; d="scan'208";a="198717092" Subject: [RFC 1/2] Unified UUID/GUID definition From: Huang Ying To: Andrew Morton , Joe Perches , Steven Whitehouse , Laurent Pinchart Cc: "linux-kernel@vger.kernel.org" Content-Type: text/plain Date: Wed, 14 Oct 2009 14:30:05 +0800 Message-Id: <1255501805.6047.1192.camel@yhuang-dev.sh.intel.com> Mime-Version: 1.0 X-Mailer: Evolution 2.26.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 + * + * This file is released under the GPLv2. + */ + +#ifndef _LINUX_UUID_H_ +#define _LINUX_UUID_H_ + +#include +#include + +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 + * + * This file is released under the GPLv2. + */ + +#include +#include +#include +#include + +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);