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OpenZFS 8491 - uberblock on-disk padding to reserve space for smoothly merging zpool checkpoint & MMP in ZFS

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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
This commit is contained in:
Serapheim Dimitropoulos 2017-07-13 07:32:53 -07:00 committed by Brian Behlendorf
parent 36ba27e9e0
commit 829f9251cf
1 changed files with 2 additions and 0 deletions
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2
include/sys/uberblock_impl.h
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@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2017 by Delphix. All rights reserved.
*/
#ifndef _SYS_UBERBLOCK_IMPL_H
@ -60,6 +61,7 @@ struct uberblock {
uint64_t ub_mmp_magic; /* MMP_MAGIC */
uint64_t ub_mmp_delay; /* nanosec since last MMP write */
uint64_t ub_mmp_seq; /* reserved for sequence number */
uint64_t ub_checkpoint_txg;
};
#ifdef __cplusplus