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-rw-r--r--uts/common/fs/zfs/uberblock.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/uberblock.c b/uts/common/fs/zfs/uberblock.c
new file mode 100644
index 000000000000..692cda137f1a
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+++ b/uts/common/fs/zfs/uberblock.c
@@ -0,0 +1,61 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#include <sys/zfs_context.h>
+#include <sys/uberblock_impl.h>
+#include <sys/vdev_impl.h>
+
+int
+uberblock_verify(uberblock_t *ub)
+{
+ if (ub->ub_magic == BSWAP_64((uint64_t)UBERBLOCK_MAGIC))
+ byteswap_uint64_array(ub, sizeof (uberblock_t));
+
+ if (ub->ub_magic != UBERBLOCK_MAGIC)
+ return (EINVAL);
+
+ return (0);
+}
+
+/*
+ * Update the uberblock and return a boolean value indicating whether
+ * anything changed in this transaction group.
+ */
+int
+uberblock_update(uberblock_t *ub, vdev_t *rvd, uint64_t txg)
+{
+ ASSERT(ub->ub_txg < txg);
+
+ /*
+ * We explicitly do not set ub_version here, so that older versions
+ * continue to be written with the previous uberblock version.
+ */
+ ub->ub_magic = UBERBLOCK_MAGIC;
+ ub->ub_txg = txg;
+ ub->ub_guid_sum = rvd->vdev_guid_sum;
+ ub->ub_timestamp = gethrestime_sec();
+ ub->ub_software_version = SPA_VERSION;
+
+ return (ub->ub_rootbp.blk_birth == txg);
+}