94 lines
3.3 KiB
C
94 lines
3.3 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) 2016, 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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/*
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* ub_checkpoint_txg indicates two things about the current uberblock:
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*
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* 1] If it is not zero then this uberblock is a checkpoint. If it is
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* zero, then this uberblock is not a checkpoint.
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*
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* 2] On checkpointed uberblocks, the value of ub_checkpoint_txg is
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* the ub_txg that the uberblock had at the time we moved it to
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* the MOS config.
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*
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* The field is set when we checkpoint the uberblock and continues to
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* hold that value even after we've rewound (unlike the ub_txg that
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* is reset to a higher value).
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*
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* Besides checks used to determine whether we are reopening the
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* pool from a checkpointed uberblock [see spa_ld_select_uberblock()],
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* the value of the field is used to determine which ZIL blocks have
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* been allocated according to the ms_sm when we are rewinding to a
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* checkpoint. Specifically, if blk_birth > ub_checkpoint_txg, then
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* the ZIL block is not allocated [see uses of spa_min_claim_txg()].
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*/
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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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