/* * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 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. * * Further, this software is distributed without any warranty that it is * free of the rightful claim of any third person regarding infringement * or the like.  Any license provided herein, whether implied or * otherwise, applies only to this software file.  Patent licenses, if * any, provided herein do not apply to combinations of this program with * other software, or any other product whatsoever. * * You should have received a copy of the GNU General Public License along * with this program; if not, write the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston MA 02111-1307, USA. * * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, * Mountain View, CA  94043, or: * * http://www.sgi.com * * For further information regarding this notice, see: * * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ */#include <xfs.h>static mutex_t	uuid_monitor;static int	uuid_table_size;static uuid_t	*uuid_table;voiduuid_init(void){	mutex_init(&uuid_monitor, MUTEX_DEFAULT, "uuid_monitor");}/* * 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. */voiduuid_getnodeuniq(uuid_t *uuid, int fsid [2]){	char	*uu = (char *)uuid;	/* on IRIX, this function assumes big-endian fields within	 * the uuid, so we use INT_GET to get the same result on	 * little-endian systems	 */	fsid[0] = (INT_GET(*(u_int16_t*)(uu+8), ARCH_CONVERT) << 16) +		   INT_GET(*(u_int16_t*)(uu+4), ARCH_CONVERT);	fsid[1] =  INT_GET(*(u_int32_t*)(uu  ), ARCH_CONVERT);}voiduuid_create_nil(uuid_t *uuid){	memset(uuid, 0, sizeof(*uuid));}intuuid_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 */}intuuid_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_tuuid_hash64(uuid_t *uuid){	__uint64_t	*sp = (__uint64_t *)uuid;	return sp[0] + sp[1];}intuuid_table_insert(uuid_t *uuid){	int	i, hole;	mutex_lock(&uuid_monitor, PVFS);	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;}voiduuid_table_remove(uuid_t *uuid){	int	i;	mutex_lock(&uuid_monitor, PVFS);	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);}