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authorHuang Ying <ying.huang@intel.com>2010-05-18 02:35:18 -0400
committerLen Brown <len.brown@intel.com>2010-05-19 22:40:47 -0400
commitfab1c23242528771a955c475ef23d99156a71a7f (patch)
tree2d882ead41cd984628cbfc18c9a2a0a663539602 /lib
parent801eab8118f61255d8e2be35939c572042618742 (diff)
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/Makefile2
-rw-r--r--lib/uuid.c53
2 files changed, 54 insertions, 1 deletions
diff --git a/lib/Makefile b/lib/Makefile
index 0d4015205c64..f3eb6e8766be 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -21,7 +21,7 @@ lib-y += kobject.o kref.o klist.o
21 21
22obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \ 22obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
23 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \ 23 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
24 string_helpers.o gcd.o lcm.o list_sort.o 24 string_helpers.o gcd.o lcm.o list_sort.o uuid.o
25 25
26ifeq ($(CONFIG_DEBUG_KOBJECT),y) 26ifeq ($(CONFIG_DEBUG_KOBJECT),y)
27CFLAGS_kobject.o += -DDEBUG 27CFLAGS_kobject.o += -DDEBUG
diff --git a/lib/uuid.c b/lib/uuid.c
new file mode 100644
index 000000000000..8fadd7cef46c
--- /dev/null
+++ b/lib/uuid.c
@@ -0,0 +1,53 @@
1/*
2 * Unified UUID/GUID definition
3 *
4 * Copyright (C) 2009, Intel Corp.
5 * Huang Ying <ying.huang@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation;
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/uuid.h>
24#include <linux/random.h>
25
26static void __uuid_gen_common(__u8 b[16])
27{
28 int i;
29 u32 r;
30
31 for (i = 0; i < 4; i++) {
32 r = random32();
33 memcpy(b + i * 4, &r, 4);
34 }
35 /* reversion 0b10 */
36 b[8] = (b[8] & 0x3F) | 0x80;
37}
38
39void uuid_le_gen(uuid_le *lu)
40{
41 __uuid_gen_common(lu->b);
42 /* version 4 : random generation */
43 lu->b[7] = (lu->b[7] & 0x0F) | 0x40;
44}
45EXPORT_SYMBOL_GPL(uuid_le_gen);
46
47void uuid_be_gen(uuid_be *bu)
48{
49 __uuid_gen_common(bu->b);
50 /* version 4 : random generation */
51 bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
52}
53EXPORT_SYMBOL_GPL(uuid_be_gen);