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kernel
os
linux
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@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
authored by
Huang Ying
and committed by
Len Brown
fab1c232
801eab81
+124
-1
+70
include/linux/uuid.h
+70
include/linux/uuid.h
···
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/*
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* UUID/GUID definition
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*
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* Copyright (C) 2010, Intel Corp.
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* Huang Ying <ying.huang@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_UUID_H_
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#define _LINUX_UUID_H_
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#include <linux/types.h>
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#include <linux/string.h>
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typedef struct {
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__u8 b[16];
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} uuid_le;
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typedef struct {
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__u8 b[16];
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} uuid_be;
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#define UUID_LE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
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((uuid_le) \
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{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
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(b) & 0xff, ((b) >> 8) & 0xff, \
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(c) & 0xff, ((c) >> 8) & 0xff, \
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(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
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#define UUID_BE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
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((uuid_be) \
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{{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \
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((b) >> 8) & 0xff, (b) & 0xff, \
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((c) >> 8) & 0xff, (c) & 0xff, \
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(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
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#define NULL_UUID_LE \
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UUID_LE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \
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0x00, 0x00, 0x00, 0x00)
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#define NULL_UUID_BE \
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UUID_BE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \
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0x00, 0x00, 0x00, 0x00)
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static inline int uuid_le_cmp(const uuid_le u1, const uuid_le u2)
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{
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return memcmp(&u1, &u2, sizeof(uuid_le));
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}
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static inline int uuid_be_cmp(const uuid_be u1, const uuid_be u2)
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{
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return memcmp(&u1, &u2, sizeof(uuid_be));
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}
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extern void uuid_le_gen(uuid_le *u);
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extern void uuid_be_gen(uuid_be *u);
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#endif
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lib/Makefile
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lib/Makefile
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obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
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bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
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string_helpers.o gcd.o lcm.o list_sort.o
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string_helpers.o gcd.o lcm.o list_sort.o uuid.o
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ifeq ($(CONFIG_DEBUG_KOBJECT),y)
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CFLAGS_kobject.o += -DDEBUG
+53
lib/uuid.c
+53
lib/uuid.c
···
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/*
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* Unified UUID/GUID definition
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*
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* Copyright (C) 2009, Intel Corp.
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* Huang Ying <ying.huang@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/uuid.h>
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#include <linux/random.h>
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static void __uuid_gen_common(__u8 b[16])
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{
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int i;
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u32 r;
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for (i = 0; i < 4; i++) {
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r = random32();
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memcpy(b + i * 4, &r, 4);
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}
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/* reversion 0b10 */
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b[8] = (b[8] & 0x3F) | 0x80;
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}
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void uuid_le_gen(uuid_le *lu)
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{
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__uuid_gen_common(lu->b);
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/* version 4 : random generation */
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lu->b[7] = (lu->b[7] & 0x0F) | 0x40;
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}
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EXPORT_SYMBOL_GPL(uuid_le_gen);
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void uuid_be_gen(uuid_be *bu)
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{
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__uuid_gen_common(bu->b);
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/* version 4 : random generation */
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bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
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}
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EXPORT_SYMBOL_GPL(uuid_be_gen);