141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would 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 the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include <xfs.h>
|
|
|
|
static mutex_t uuid_monitor;
|
|
static int uuid_table_size;
|
|
static uuid_t *uuid_table;
|
|
|
|
/* IRIX interpretation of an uuid_t */
|
|
typedef struct {
|
|
__be32 uu_timelow;
|
|
__be16 uu_timemid;
|
|
__be16 uu_timehi;
|
|
__be16 uu_clockseq;
|
|
__be16 uu_node[3];
|
|
} xfs_uu_t;
|
|
|
|
/*
|
|
* uuid_getnodeuniq - obtain the node unique fields of a UUID.
|
|
*
|
|
* This is not in any way a standard or condoned UUID function;
|
|
* it just something that's needed for user-level file handles.
|
|
*/
|
|
void
|
|
uuid_getnodeuniq(uuid_t *uuid, int fsid [2])
|
|
{
|
|
xfs_uu_t *uup = (xfs_uu_t *)uuid;
|
|
|
|
fsid[0] = (be16_to_cpu(uup->uu_clockseq) << 16) |
|
|
be16_to_cpu(uup->uu_timemid);
|
|
fsid[1] = be32_to_cpu(uup->uu_timelow);
|
|
}
|
|
|
|
void
|
|
uuid_create_nil(uuid_t *uuid)
|
|
{
|
|
memset(uuid, 0, sizeof(*uuid));
|
|
}
|
|
|
|
int
|
|
uuid_is_nil(uuid_t *uuid)
|
|
{
|
|
int i;
|
|
char *cp = (char *)uuid;
|
|
|
|
if (uuid == NULL)
|
|
return 0;
|
|
/* implied check of version number here... */
|
|
for (i = 0; i < sizeof *uuid; i++)
|
|
if (*cp++) return 0; /* not nil */
|
|
return 1; /* is nil */
|
|
}
|
|
|
|
int
|
|
uuid_equal(uuid_t *uuid1, uuid_t *uuid2)
|
|
{
|
|
return memcmp(uuid1, uuid2, sizeof(uuid_t)) ? 0 : 1;
|
|
}
|
|
|
|
/*
|
|
* Given a 128-bit uuid, return a 64-bit value by adding the top and bottom
|
|
* 64-bit words. NOTE: This function can not be changed EVER. Although
|
|
* brain-dead, some applications depend on this 64-bit value remaining
|
|
* persistent. Specifically, DMI vendors store the value as a persistent
|
|
* filehandle.
|
|
*/
|
|
__uint64_t
|
|
uuid_hash64(uuid_t *uuid)
|
|
{
|
|
__uint64_t *sp = (__uint64_t *)uuid;
|
|
|
|
return sp[0] + sp[1];
|
|
}
|
|
|
|
int
|
|
uuid_table_insert(uuid_t *uuid)
|
|
{
|
|
int i, hole;
|
|
|
|
mutex_lock(&uuid_monitor);
|
|
for (i = 0, hole = -1; i < uuid_table_size; i++) {
|
|
if (uuid_is_nil(&uuid_table[i])) {
|
|
hole = i;
|
|
continue;
|
|
}
|
|
if (uuid_equal(uuid, &uuid_table[i])) {
|
|
mutex_unlock(&uuid_monitor);
|
|
return 0;
|
|
}
|
|
}
|
|
if (hole < 0) {
|
|
uuid_table = kmem_realloc(uuid_table,
|
|
(uuid_table_size + 1) * sizeof(*uuid_table),
|
|
uuid_table_size * sizeof(*uuid_table),
|
|
KM_SLEEP);
|
|
hole = uuid_table_size++;
|
|
}
|
|
uuid_table[hole] = *uuid;
|
|
mutex_unlock(&uuid_monitor);
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
uuid_table_remove(uuid_t *uuid)
|
|
{
|
|
int i;
|
|
|
|
mutex_lock(&uuid_monitor);
|
|
for (i = 0; i < uuid_table_size; i++) {
|
|
if (uuid_is_nil(&uuid_table[i]))
|
|
continue;
|
|
if (!uuid_equal(uuid, &uuid_table[i]))
|
|
continue;
|
|
uuid_create_nil(&uuid_table[i]);
|
|
break;
|
|
}
|
|
ASSERT(i < uuid_table_size);
|
|
mutex_unlock(&uuid_monitor);
|
|
}
|
|
|
|
void __init
|
|
uuid_init(void)
|
|
{
|
|
mutex_init(&uuid_monitor);
|
|
}
|