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4d3c95f5 JL |
1 | /* |
2 | * GRUB -- GRand Unified Bootloader | |
3 | * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
4d3c95f5 JL |
6 | */ |
7 | /* | |
8 | * Copyright 2007 Sun Microsystems, Inc. All rights reserved. | |
9 | * Use is subject to license terms. | |
10 | */ | |
11 | ||
12 | #ifndef _SYS_UBERBLOCK_IMPL_H | |
13 | #define _SYS_UBERBLOCK_IMPL_H | |
14 | ||
15 | #define UBMAX(a, b) ((a) > (b) ? (a) : (b)) | |
16 | ||
17 | /* | |
18 | * The uberblock version is incremented whenever an incompatible on-disk | |
19 | * format change is made to the SPA, DMU, or ZAP. | |
20 | * | |
21 | * Note: the first two fields should never be moved. When a storage pool | |
22 | * is opened, the uberblock must be read off the disk before the version | |
23 | * can be checked. If the ub_version field is moved, we may not detect | |
24 | * version mismatch. If the ub_magic field is moved, applications that | |
25 | * expect the magic number in the first word won't work. | |
26 | */ | |
27 | #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */ | |
28 | #define UBERBLOCK_SHIFT 10 /* up to 1K */ | |
29 | ||
30 | typedef struct uberblock { | |
31 | uint64_t ub_magic; /* UBERBLOCK_MAGIC */ | |
32 | uint64_t ub_version; /* ZFS_VERSION */ | |
33 | uint64_t ub_txg; /* txg of last sync */ | |
34 | uint64_t ub_guid_sum; /* sum of all vdev guids */ | |
35 | uint64_t ub_timestamp; /* UTC time of last sync */ | |
36 | blkptr_t ub_rootbp; /* MOS objset_phys_t */ | |
37 | } uberblock_t; | |
38 | ||
39 | #define VDEV_UBERBLOCK_SHIFT(as) UBMAX(as, UBERBLOCK_SHIFT) | |
40 | #define UBERBLOCK_SIZE(as) (1ULL << VDEV_UBERBLOCK_SHIFT(as)) | |
41 | ||
42 | /* Number of uberblocks that can fit in the ring at a given ashift */ | |
43 | #define UBERBLOCK_COUNT(as) (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(as)) | |
44 | ||
45 | #endif /* _SYS_UBERBLOCK_IMPL_H */ |