diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/obdclass/uuid.c')
-rw-r--r-- | drivers/staging/lustre/lustre/obdclass/uuid.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/obdclass/uuid.c b/drivers/staging/lustre/lustre/obdclass/uuid.c new file mode 100644 index 000000000000..af5f27f82bc5 --- /dev/null +++ b/drivers/staging/lustre/lustre/obdclass/uuid.c @@ -0,0 +1,82 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will 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 version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * lustre/obdclass/uuid.c + * + * Public include file for the UUID library + */ + +#define DEBUG_SUBSYSTEM S_CLASS + +# include <linux/libcfs/libcfs.h> + +#include <obd_support.h> +#include <obd_class.h> + + +static inline __u32 consume(int nob, __u8 **ptr) +{ + __u32 value; + + LASSERT(nob <= sizeof value); + + for (value = 0; nob > 0; --nob) + value = (value << 8) | *((*ptr)++); + return value; +} + +#define CONSUME(val, ptr) (val) = consume(sizeof(val), (ptr)) + +static void uuid_unpack(class_uuid_t in, __u16 *uu, int nr) +{ + __u8 *ptr = in; + + LASSERT(nr * sizeof *uu == sizeof(class_uuid_t)); + + while (nr-- > 0) + CONSUME(uu[nr], &ptr); +} + +void class_uuid_unparse(class_uuid_t uu, struct obd_uuid *out) +{ + /* uu as an array of __u16's */ + __u16 uuid[sizeof(class_uuid_t) / sizeof(__u16)]; + + CLASSERT(ARRAY_SIZE(uuid) == 8); + + uuid_unpack(uu, uuid, ARRAY_SIZE(uuid)); + sprintf(out->uuid, "%04x%04x-%04x-%04x-%04x-%04x%04x%04x", + uuid[0], uuid[1], uuid[2], uuid[3], + uuid[4], uuid[5], uuid[6], uuid[7]); +} +EXPORT_SYMBOL(class_uuid_unparse); |