/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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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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#define UBMAX(a, b) ((a) > (b) ? (a) : (b))
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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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typedef struct uberblock {
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uint64_t ub_magic; /* UBERBLOCK_MAGIC */
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uint64_t ub_version; /* ZFS_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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} uberblock_t;
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#define VDEV_UBERBLOCK_SHIFT(as) UBMAX(as, UBERBLOCK_SHIFT)
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#define UBERBLOCK_SIZE(as) (1ULL << VDEV_UBERBLOCK_SHIFT(as))
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/* Number of uberblocks that can fit in the ring at a given ashift */
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#define UBERBLOCK_COUNT(as) (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(as))
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#endif /* _SYS_UBERBLOCK_IMPL_H */
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