/*
 * 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.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2012, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/obdclass/debug.c
 *
 * Helper routines for dumping data structs for debugging.
 */

#define DEBUG_SUBSYSTEM D_OTHER

#include <asm/unaligned.h>

#include <obd_support.h>
#include <lustre_debug.h>
#include <lustre_net.h>

#define LPDS sizeof(__u64)
int block_debug_setup(void *addr, int len, __u64 off, __u64 id)
{
	LASSERT(addr);

	put_unaligned_le64(off, addr);
	put_unaligned_le64(id, addr + LPDS);
	addr += len - LPDS - LPDS;
	put_unaligned_le64(off, addr);
	put_unaligned_le64(id, addr + LPDS);

	return 0;
}
EXPORT_SYMBOL(block_debug_setup);

int block_debug_check(char *who, void *addr, int end, __u64 off, __u64 id)
{
	__u64 ne_off;
	int err = 0;

	LASSERT(addr);

	ne_off = le64_to_cpu(off);
	id = le64_to_cpu(id);
	if (memcmp(addr, (char *)&ne_off, LPDS)) {
		CDEBUG(D_ERROR, "%s: id %#llx offset %llu off: %#llx != %#llx\n",
		       who, id, off, *(__u64 *)addr, ne_off);
		err = -EINVAL;
	}
	if (memcmp(addr + LPDS, (char *)&id, LPDS)) {
		CDEBUG(D_ERROR, "%s: id %#llx offset %llu id: %#llx != %#llx\n",
		       who, id, off, *(__u64 *)(addr + LPDS), id);
		err = -EINVAL;
	}

	addr += end - LPDS - LPDS;
	if (memcmp(addr, (char *)&ne_off, LPDS)) {
		CDEBUG(D_ERROR, "%s: id %#llx offset %llu end off: %#llx != %#llx\n",
		       who, id, off, *(__u64 *)addr, ne_off);
		err = -EINVAL;
	}
	if (memcmp(addr + LPDS, (char *)&id, LPDS)) {
		CDEBUG(D_ERROR, "%s: id %#llx offset %llu end id: %#llx != %#llx\n",
		       who, id, off, *(__u64 *)(addr + LPDS), id);
		err = -EINVAL;
	}

	return err;
}
EXPORT_SYMBOL(block_debug_check);
#undef LPDS