diff options
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common/fs/zfs/uberblock.c')
-rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/uberblock.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/uberblock.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/uberblock.c new file mode 100644 index 000000000000..8b198469e1c2 --- /dev/null +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/uberblock.c @@ -0,0 +1,63 @@ +/* + * 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. + * Copyright (c) 2013, 2017 by Delphix. 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 (SET_ERROR(EINVAL)); + + return (0); +} + +/* + * Update the uberblock and return TRUE if anything changed in this + * transaction group. + */ +boolean_t +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; + ub->ub_checkpoint_txg = 0; + + return (ub->ub_rootbp.blk_birth == txg); +} |