1 files changed, 62 insertions, 0 deletions
diff --git a/usr/src/common/lvm/md_revchk.c b/usr/src/common/lvm/md_revchk.c
new file mode 100644
index 0000000000..63af20c83a
--- /dev/null
+++ b/usr/src/common/lvm/md_revchk.c
@@ -0,0 +1,62 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/types.h>
+/*
+ * Need to include md_mddb.h for the MDDB_REV_MAJOR and MDDB_REV_MINOR
+ * definitions.  The other files included are required for md_mddb.h.
+ */
+#ifdef _KERNEL
+#include <sys/lvm/md_basic.h>
+#include <sys/lvm/mdvar.h>
+#else /* !_KERNEL */
+#include <meta.h>
+#endif /* _KERNEL */
+#include <sys/lvm/md_mddb.h>
+
+
+/*
+ * revchk()
+ * Checks the major and minor revision numbers for either an in-core or on-disk
+ * directory block or record block against the currently defined major and
+ * minor numbers(MDDB_REV_MAJOR and MDDB_REV_MINOR) to make sure that they are
+ * compatible with this version of SVM.  For example, earlier versions of SVM
+ * don't understand dummy masterblocks or deviceIDs in disksets.
+ */
+int
+revchk(
+	uint_t	my_rev,
+	uint_t	data
+)
+{
+	if ((MDDB_REV_MAJOR & my_rev) != (MDDB_REV_MAJOR & data))
+		return (1);
+	if ((MDDB_REV_MINOR & my_rev) < (MDDB_REV_MINOR & data))
+		return (1);
+	return (0);
+}