zfs: Add ZFS filesystem support

[u-boot] / include / zfs / uberblock_impl.h

diff --git a/include/zfs/uberblock_impl.h b/include/zfs/uberblock_impl.h
new file mode 100644 (file)
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--- /dev/null
+++ 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 */