1/* 2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18#include <xfs.h> 19 20/* IRIX interpretation of an uuid_t */ 21typedef struct { 22 __be32 uu_timelow; 23 __be16 uu_timemid; 24 __be16 uu_timehi; 25 __be16 uu_clockseq; 26 __be16 uu_node[3]; 27} xfs_uu_t; 28 29/* 30 * uuid_getnodeuniq - obtain the node unique fields of a UUID. 31 * 32 * This is not in any way a standard or condoned UUID function; 33 * it just something that's needed for user-level file handles. 34 */ 35void 36uuid_getnodeuniq(uuid_t *uuid, int fsid [2]) 37{ 38 xfs_uu_t *uup = (xfs_uu_t *)uuid; 39 40 fsid[0] = (be16_to_cpu(uup->uu_clockseq) << 16) | 41 be16_to_cpu(uup->uu_timemid); 42 fsid[1] = be32_to_cpu(uup->uu_timelow); 43} 44 45int 46uuid_is_nil(uuid_t *uuid) 47{ 48 int i; 49 char *cp = (char *)uuid; 50 51 if (uuid == NULL) 52 return 0; 53 /* implied check of version number here... */ 54 for (i = 0; i < sizeof *uuid; i++) 55 if (*cp++) return 0; /* not nil */ 56 return 1; /* is nil */ 57} 58 59int 60uuid_equal(uuid_t *uuid1, uuid_t *uuid2) 61{ 62 return memcmp(uuid1, uuid2, sizeof(uuid_t)) ? 0 : 1; 63} 64