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Commit fab1c232 authored by Huang Ying's avatar Huang Ying Committed by Len Brown
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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: default avatarHuang Ying <ying.huang@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 801eab81

include/linux/uuid.h

0 → 100644
+70 −0
Original line number Diff line number Diff line 
/*

 * UUID/GUID definition

 *

 * Copyright (C) 2010, Intel Corp.

 *	Huang Ying <ying.huang@intel.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License version

 * 2 as published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */



#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

lib/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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 lcm.o list_sort.o

	 string_helpers.o gcd.o lcm.o list_sort.o uuid.o



ifeq ($(CONFIG_DEBUG_KOBJECT),y)

CFLAGS_kobject.o += -DDEBUG

lib/uuid.c

0 → 100644
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Original line number Diff line number Diff line 
/*

 * Unified UUID/GUID definition

 *

 * Copyright (C) 2009, Intel Corp.

 *	Huang Ying <ying.huang@intel.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License version

 * 2 as published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/uuid.h>

#include <linux/random.h>



static void __uuid_gen_common(__u8 b[16])

{

	int i;

	u32 r;



	for (i = 0; i < 4; i++) {

		r = random32();

		memcpy(b + i * 4, &r, 4);

	}

	/* 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);