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>
diff --git a/include/zfs/dnode.h b/include/zfs/dnode.h
new file mode 100644
index 0000000..09b4562
--- /dev/null
+++ b/include/zfs/dnode.h
@@ -0,0 +1,81 @@
+/*
+ * 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 2010 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_DNODE_H
+#define _SYS_DNODE_H
+
+#include <zfs/spa.h>
+
+/*
+ * Fixed constants.
+ */
+#define DNODE_SHIFT 9 /* 512 bytes */
+#define DN_MIN_INDBLKSHIFT 10 /* 1k */
+#define DN_MAX_INDBLKSHIFT 14 /* 16k */
+#define DNODE_BLOCK_SHIFT 14 /* 16k */
+#define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */
+#define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */
+#define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */
+
+/*
+ * Derived constants.
+ */
+#define DNODE_SIZE (1 << DNODE_SHIFT)
+#define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
+#define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
+#define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT)
+
+#define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
+#define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT)
+#define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
+
+#define DNODE_FLAG_SPILL_BLKPTR (1<<2)
+
+#define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \
+ (((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t))))
+
+typedef struct dnode_phys {
+ uint8_t dn_type; /* dmu_object_type_t */
+ uint8_t dn_indblkshift; /* ln2(indirect block size) */
+ uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */
+ uint8_t dn_nblkptr; /* length of dn_blkptr */
+ uint8_t dn_bonustype; /* type of data in bonus buffer */
+ uint8_t dn_checksum; /* ZIO_CHECKSUM type */
+ uint8_t dn_compress; /* ZIO_COMPRESS type */
+ uint8_t dn_flags; /* DNODE_FLAG_* */
+ uint16_t dn_datablkszsec; /* data block size in 512b sectors */
+ uint16_t dn_bonuslen; /* length of dn_bonus */
+ uint8_t dn_pad2[4];
+
+ /* accounting is protected by dn_dirty_mtx */
+ uint64_t dn_maxblkid; /* largest allocated block ID */
+ uint64_t dn_used; /* bytes (or sectors) of disk space */
+
+ uint64_t dn_pad3[4];
+
+ blkptr_t dn_blkptr[1];
+ uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)];
+ blkptr_t dn_spill;
+} dnode_phys_t;
+
+#endif /* _SYS_DNODE_H */