diff options
| author | Serapheim Dimitropoulos <serapheim@delphix.com> | 2017-07-13 07:32:53 -0700 |
|---|---|---|
| committer | Prakash Surya <prakash.surya@delphix.com> | 2017-07-21 17:27:52 -0700 |
| commit | 79c2b812ee2010ebf20fdd92dc5f06b59000a94c (patch) | |
| tree | 2f7413cd0b61e5791a3a52e4d964d1419d4baf92 | |
| parent | 4ac9cfccca470985479d54f113ab420ee8215120 (diff) | |
| download | illumos-gate-79c2b812ee2010ebf20fdd92dc5f06b59000a94c.tar.gz | |
8491 uberblock on-disk padding to reserve space for smoothly merging zpool checkpoint & MMP in ZFS
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>
| -rw-r--r-- | usr/src/uts/common/fs/zfs/sys/uberblock_impl.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/usr/src/uts/common/fs/zfs/sys/uberblock_impl.h b/usr/src/uts/common/fs/zfs/sys/uberblock_impl.h index 6ab6aa3135..2d5e845fcd 100644 --- a/usr/src/uts/common/fs/zfs/sys/uberblock_impl.h +++ b/usr/src/uts/common/fs/zfs/sys/uberblock_impl.h @@ -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 @@ -54,6 +55,12 @@ struct uberblock { /* highest SPA_VERSION supported by software that wrote this txg */ uint64_t ub_software_version; + + /* These fields are reserved for features that are under development: */ + uint64_t ub_mmp_magic; + uint64_t ub_mmp_delay; + uint64_t ub_mmp_seq; + uint64_t ub_checkpoint_txg; }; #ifdef __cplusplus |