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authorJorgen Lundman <lundman@lundman.net>2012-07-19 20:48:25 +0000
committerWolfgang Denk <wd@denx.de>2012-08-09 23:42:20 +0200
commit4d3c95f5ea7c737a21cd6b9c59435ee693b3f127 (patch)
treed11c09245a46d3b0a55c0937874fb2debcb96490 /include/zfs/uberblock_impl.h
parent753ac610880e6e563d0384bb114f8b41df89e520 (diff)
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zfs: Add ZFS filesystem support
U-Boot port is based on sources forked from GRUB-0.97 by Sun in 2004, which can be found here: http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/grub/grub-0.97/stage2/zfs-include/zfs.h Released by Sun for GRUB under the license: * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. GRUB official releases include ZFS in version: ftp://alpha.gnu.org/gnu/grub/grub-1.99~rc1.tar.gz And patched against GRUB Bazaar repository for ashift fixes (4KB HDDs) more conveniently found at github: https://github.com/pendor/grub-zfs/commit/e7b6ef3ac3b9685ac4c394c897b1d4221b7381f1 Signed-off-by: Jorgen Lundman <lundman@lundman.net>
Diffstat (limited to 'include/zfs/uberblock_impl.h')
-rw-r--r--include/zfs/uberblock_impl.h57
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diff --git a/include/zfs/uberblock_impl.h b/include/zfs/uberblock_impl.h
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+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/*
+ * 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 */