[people/ms/u-boot.git] / include / zfs / uberblock_impl.h

/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_UBERBLOCK_IMPL_H
#define	_SYS_UBERBLOCK_IMPL_H

#define UBMAX(a, b) ((a) > (b) ? (a) : (b))

/*
 * The uberblock version is incremented whenever an incompatible on-disk
 * format change is made to the SPA, DMU, or ZAP.
 *
 * Note: the first two fields should never be moved.  When a storage pool
 * is opened, the uberblock must be read off the disk before the version
 * can be checked.	If the ub_version field is moved, we may not detect
 * version mismatch.  If the ub_magic field is moved, applications that
 * expect the magic number in the first word won't work.
 */
#define	UBERBLOCK_MAGIC		0x00bab10c		/* oo-ba-bloc!	*/
#define	UBERBLOCK_SHIFT		10			/* up to 1K	*/

typedef struct uberblock {
	uint64_t	ub_magic;	/* UBERBLOCK_MAGIC		*/
	uint64_t	ub_version;	/* ZFS_VERSION			*/
	uint64_t	ub_txg;		/* txg of last sync		*/
	uint64_t	ub_guid_sum;	/* sum of all vdev guids	*/
	uint64_t	ub_timestamp;	/* UTC time of last sync	*/
	blkptr_t	ub_rootbp;	/* MOS objset_phys_t		*/
} uberblock_t;

#define	VDEV_UBERBLOCK_SHIFT(as)	UBMAX(as, UBERBLOCK_SHIFT)
#define	UBERBLOCK_SIZE(as)		(1ULL << VDEV_UBERBLOCK_SHIFT(as))

/* Number of uberblocks that can fit in the ring at a given ashift */
#define UBERBLOCK_COUNT(as) (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(as))

#endif	/* _SYS_UBERBLOCK_IMPL_H */
Commit	Line	Data
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 */