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The zpool checkpoint feature in DxOS added a new field in the uberblock. The Multi-Modifier Protection Pull Request from ZoL adds three new fields in the uberblock (Reference: https://github.com/zfsonlinux/zfs/pull/6279). As these two changes come from two different sources and once upstreamed and deployed will introduce an incompatibility with each other we want to upstream a change that will reserve the padding for both of them so integration goes smoothly and everyone gets both features. Porting Notes: Preserved MMP comments in uberblock struct. Authored by: Serapheim Dimitropoulos <serapheim@delphix.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed by: Olaf Faaland <faaland1@llnl.gov> Approved by: Gordon Ross <gwr@nexenta.com> Ported-by: Giuseppe Di Natale <dinatale2@llnl.gov> OpenZFS-issue: https://www.illumos.org/issues/8491 OpenZFS-commit: https://github.com/openzfs/openzfs/commit/d84fa5f Closes #6390
72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2017 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_UBERBLOCK_IMPL_H
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#define _SYS_UBERBLOCK_IMPL_H
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#include <sys/uberblock.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* The uberblock version is incremented whenever an incompatible on-disk
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* format change is made to the SPA, DMU, or ZAP.
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*
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* Note: the first two fields should never be moved. When a storage pool
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* is opened, the uberblock must be read off the disk before the version
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* can be checked. If the ub_version field is moved, we may not detect
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* version mismatch. If the ub_magic field is moved, applications that
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* expect the magic number in the first word won't work.
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*/
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#define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */
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#define UBERBLOCK_SHIFT 10 /* up to 1K */
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#define MMP_MAGIC 0xa11cea11 /* all-see-all */
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struct uberblock {
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uint64_t ub_magic; /* UBERBLOCK_MAGIC */
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uint64_t ub_version; /* SPA_VERSION */
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uint64_t ub_txg; /* txg of last sync */
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uint64_t ub_guid_sum; /* sum of all vdev guids */
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uint64_t ub_timestamp; /* UTC time of last sync */
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blkptr_t ub_rootbp; /* MOS objset_phys_t */
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/* highest SPA_VERSION supported by software that wrote this txg */
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uint64_t ub_software_version;
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/* Maybe missing in uberblocks we read, but always written */
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uint64_t ub_mmp_magic; /* MMP_MAGIC */
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uint64_t ub_mmp_delay; /* nanosec since last MMP write */
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uint64_t ub_mmp_seq; /* reserved for sequence number */
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uint64_t ub_checkpoint_txg;
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};
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_UBERBLOCK_IMPL_H */
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