diff --git a/Makefile b/Makefile
index 351a8f0..d3b84bf 100644
--- a/Makefile
+++ b/Makefile
@@ -244,7 +244,7 @@ endif
 LIBS += arch/$(ARCH)/lib/lib$(ARCH).o
 LIBS += fs/cramfs/libcramfs.o fs/fat/libfat.o fs/fdos/libfdos.o fs/jffs2/libjffs2.o \
 	fs/reiserfs/libreiserfs.o fs/ext2/libext2fs.o fs/yaffs2/libyaffs2.o \
-	fs/ubifs/libubifs.o
+	fs/ubifs/libubifs.o fs/zfs/libzfs.o
 LIBS += net/libnet.o
 LIBS += disk/libdisk.o
 LIBS += drivers/bios_emulator/libatibiosemu.o
diff --git a/common/Makefile b/common/Makefile
index 6e23baa..4de03da 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -164,6 +164,7 @@ COBJS-$(CONFIG_USB_STORAGE) += usb_storage.o
 endif
 COBJS-$(CONFIG_CMD_XIMG) += cmd_ximg.o
 COBJS-$(CONFIG_YAFFS2) += cmd_yaffs2.o
+COBJS-$(CONFIG_CMD_ZFS) += cmd_zfs.o
 COBJS-$(CONFIG_CMD_SPL) += cmd_spl.o
 
 # others
diff --git a/common/cmd_zfs.c b/common/cmd_zfs.c
new file mode 100644
index 0000000..a6ea2c0
--- /dev/null
+++ b/common/cmd_zfs.c
@@ -0,0 +1,236 @@
+/*
+ *
+ * ZFS filesystem porting to Uboot by
+ * Jorgen Lundman <lundman at lundman.net>
+ *
+ * zfsfs support
+ * made from existing GRUB Sources by Sun, GNU and others.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <common.h>
+#include <part.h>
+#include <config.h>
+#include <command.h>
+#include <image.h>
+#include <linux/ctype.h>
+#include <asm/byteorder.h>
+#include <zfs_common.h>
+#include <linux/stat.h>
+#include <malloc.h>
+
+#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
+#include <usb.h>
+#endif
+
+#if !defined(CONFIG_DOS_PARTITION) && !defined(CONFIG_EFI_PARTITION)
+#error DOS or EFI partition support must be selected
+#endif
+
+#define DOS_PART_MAGIC_OFFSET	0x1fe
+#define DOS_FS_TYPE_OFFSET	0x36
+#define DOS_FS32_TYPE_OFFSET	0x52
+
+static int do_zfs_load(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	char *filename = NULL;
+	char *ep;
+	int dev;
+	unsigned long part = 1;
+	ulong addr = 0;
+	ulong part_length;
+	disk_partition_t info;
+	char buf[12];
+	unsigned long count;
+	const char *addr_str;
+	struct zfs_file zfile;
+	struct device_s vdev;
+
+	if (argc < 3)
+		return CMD_RET_USAGE;
+
+	count = 0;
+	addr = simple_strtoul(argv[3], NULL, 16);
+	filename = getenv("bootfile");
+	switch (argc) {
+	case 3:
+		addr_str = getenv("loadaddr");
+		if (addr_str != NULL)
+			addr = simple_strtoul(addr_str, NULL, 16);
+		else
+			addr = CONFIG_SYS_LOAD_ADDR;
+
+		break;
+	case 4:
+		break;
+	case 5:
+		filename = argv[4];
+		break;
+	case 6:
+		filename = argv[4];
+		count = simple_strtoul(argv[5], NULL, 16);
+		break;
+
+	default:
+		return cmd_usage(cmdtp);
+	}
+
+	if (!filename) {
+		puts("** No boot file defined **\n");
+		return 1;
+	}
+
+	dev = (int)simple_strtoul(argv[2], &ep, 16);
+	zfs_dev_desc = get_dev(argv[1], dev);
+	if (zfs_dev_desc == NULL) {
+		printf("** Block device %s %d not supported\n", argv[1], dev);
+		return 1;
+	}
+
+	if (*ep) {
+		if (*ep != ':') {
+			puts("** Invalid boot device, use `dev[:part]' **\n");
+			return 1;
+		}
+		part = simple_strtoul(++ep, NULL, 16);
+	}
+
+	if (part != 0) {
+		if (get_partition_info(zfs_dev_desc, part, &info)) {
+			printf("** Bad partition %lu **\n", part);
+			return 1;
+		}
+
+		if (strncmp((char *)info.type, BOOT_PART_TYPE,
+					strlen(BOOT_PART_TYPE)) != 0) {
+			printf("** Invalid partition type \"%s\" (expect \"" BOOT_PART_TYPE "\")\n",
+				   info.type);
+			return 1;
+		}
+		printf("Loading file \"%s\" "
+			   "from %s device %d:%lu %s\n",
+			   filename, argv[1], dev, part, info.name);
+	} else {
+		printf("Loading file \"%s\" from %s device %d\n",
+			   filename, argv[1], dev);
+	}
+
+	part_length = zfs_set_blk_dev(zfs_dev_desc, part);
+	if (part_length == 0) {
+		printf("**Bad partition - %s %d:%lu **\n", argv[1], dev, part);
+		return 1;
+	}
+
+	vdev.part_length = part_length;
+
+	memset(&zfile, 0, sizeof(zfile));
+	zfile.device = &vdev;
+	if (zfs_open(&zfile, filename)) {
+		printf("** File not found %s\n", filename);
+		return 1;
+	}
+
+	if ((count < zfile.size) && (count != 0))
+		zfile.size = (uint64_t)count;
+
+	if (zfs_read(&zfile, (char *)addr, zfile.size) != zfile.size) {
+		printf("** Unable to read \"%s\" from %s %d:%lu **\n",
+			   filename, argv[1], dev, part);
+		zfs_close(&zfile);
+		return 1;
+	}
+
+	zfs_close(&zfile);
+
+	/* Loading ok, update default load address */
+	load_addr = addr;
+
+	printf("%llu bytes read\n", zfile.size);
+	sprintf(buf, "%llX", zfile.size);
+	setenv("filesize", buf);
+
+	return 0;
+}
+
+
+int zfs_print(const char *entry, const struct zfs_dirhook_info *data)
+{
+	printf("%s %s\n",
+		   data->dir ? "<DIR> " : "		 ",
+		   entry);
+	return 0; /* 0 continue, 1 stop */
+}
+
+
+
+static int do_zfs_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	const char *filename = "/";
+	int dev;
+	unsigned long part = 1;
+	char *ep;
+	int part_length;
+	struct device_s vdev;
+
+	if (argc < 3)
+		return cmd_usage(cmdtp);
+
+	dev = (int)simple_strtoul(argv[2], &ep, 16);
+	zfs_dev_desc = get_dev(argv[1], dev);
+
+	if (zfs_dev_desc == NULL) {
+		printf("\n** Block device %s %d not supported\n", argv[1], dev);
+		return 1;
+	}
+
+	if (*ep) {
+		if (*ep != ':') {
+			puts("\n** Invalid boot device, use `dev[:part]' **\n");
+			return 1;
+		}
+		part = simple_strtoul(++ep, NULL, 16);
+	}
+
+	if (argc == 4)
+		filename = argv[3];
+
+	part_length = zfs_set_blk_dev(zfs_dev_desc, part);
+	if (part_length == 0) {
+		printf("** Bad partition - %s %d:%lu **\n", argv[1], dev, part);
+		return 1;
+	}
+
+	vdev.part_length = part_length;
+
+	zfs_ls(&vdev, filename,
+		   zfs_print);
+
+	return 0;
+}
+
+
+U_BOOT_CMD(zfsls, 4, 1, do_zfs_ls,
+		   "list files in a directory (default /)",
+		   "<interface> <dev[:part]> [directory]\n"
+		   "	  - list files from 'dev' on 'interface' in a '/DATASET/@/$dir/'");
+
+U_BOOT_CMD(zfsload, 6, 0, do_zfs_load,
+		   "load binary file from a ZFS filesystem",
+		   "<interface> <dev[:part]> [addr] [filename] [bytes]\n"
+		   "	  - load binary file '/DATASET/@/$dir/$file' from 'dev' on 'interface'\n"
+		   "		 to address 'addr' from ZFS filesystem");
diff --git a/fs/Makefile b/fs/Makefile
index 22aad12..baa7e96 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -1,6 +1,6 @@
 #
 # (C) Copyright 2000-2006
-# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+# Wolfgang Denk, DENX Software Engineering, <wd at denx.de>
 #
 # See file CREDITS for list of people who contributed to this
 # project.
@@ -30,6 +30,7 @@ subdirs-$(CONFIG_CMD_JFFS2) += jffs2
 subdirs-$(CONFIG_CMD_REISER) += reiserfs
 subdirs-$(CONFIG_YAFFS2) += yaffs2
 subdirs-$(CONFIG_CMD_UBIFS) += ubifs
+subdirs-$(CONFIG_CMD_ZFS) += zfs
 
 SUBDIRS	:= $(subdirs-y)
 
diff --git a/fs/Makefile b/fs/zfs/Makefile
similarity index 56%
copy from fs/Makefile
copy to fs/zfs/Makefile
index 22aad12..938fc5e 100644
--- a/fs/Makefile
+++ b/fs/zfs/Makefile
@@ -1,6 +1,6 @@
 #
-# (C) Copyright 2000-2006
-# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+# (C) Copyright 2012
+# Jorgen Lundman <lundman at lundman.net>
 #
 # See file CREDITS for list of people who contributed to this
 # project.
@@ -20,19 +20,28 @@
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 # MA 02111-1307 USA
 #
-#
 
-subdirs-$(CONFIG_CMD_CRAMFS) := cramfs
-subdirs-$(CONFIG_CMD_EXT2) += ext2
-subdirs-$(CONFIG_CMD_FAT) += fat
-subdirs-$(CONFIG_CMD_FDOS) += fdos
-subdirs-$(CONFIG_CMD_JFFS2) += jffs2
-subdirs-$(CONFIG_CMD_REISER) += reiserfs
-subdirs-$(CONFIG_YAFFS2) += yaffs2
-subdirs-$(CONFIG_CMD_UBIFS) += ubifs
+include $(TOPDIR)/config.mk
+
+LIB	= $(obj)libzfs.o
+
+AOBJS	=
+COBJS-$(CONFIG_CMD_ZFS) := dev.o zfs.o zfs_fletcher.o zfs_sha256.o zfs_lzjb.o
+
+SRCS	:= $(AOBJS:.o=.S) $(COBJS-y:.o=.c)
+OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS-y))
+
+
+all:	$(LIB) $(AOBJS)
+
+$(LIB):	$(obj).depend $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-SUBDIRS	:= $(subdirs-y)
+sinclude $(obj).depend
 
-$(obj).depend all:
-	@for dir in $(SUBDIRS) ; do \
-		$(MAKE) -C $$dir $@ ; done
+#########################################################################
diff --git a/fs/zfs/dev.c b/fs/zfs/dev.c
new file mode 100644
index 0000000..ab32865
--- /dev/null
+++ b/fs/zfs/dev.c
@@ -0,0 +1,137 @@
+/*
+ *
+ *	based on code of fs/reiserfs/dev.c by
+ *
+ *	(C) Copyright 2003 - 2004
+ *	Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
+ *
+ *	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.
+ */
+
+
+#include <common.h>
+#include <config.h>
+#include <zfs_common.h>
+
+static block_dev_desc_t *zfs_block_dev_desc;
+static disk_partition_t part_info;
+
+int zfs_set_blk_dev(block_dev_desc_t *rbdd, int part)
+{
+	zfs_block_dev_desc = rbdd;
+
+	if (part == 0) {
+		/* disk doesn't use partition table */
+		part_info.start = 0;
+		part_info.size = rbdd->lba;
+		part_info.blksz = rbdd->blksz;
+	} else {
+		if (get_partition_info(zfs_block_dev_desc, part, &part_info))
+			return 0;
+	}
+
+	return part_info.size;
+}
+
+/* err */
+int zfs_devread(int sector, int byte_offset, int byte_len, char *buf)
+{
+	short sec_buffer[SECTOR_SIZE/sizeof(short)];
+	char *sec_buf = sec_buffer;
+	unsigned block_len;
+
+	/*
+	 *	Check partition boundaries
+	 */
+	if ((sector < 0) ||
+		((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
+		 part_info.size)) {
+		/*		errnum = ERR_OUTSIDE_PART; */
+		printf(" ** zfs_devread() read outside partition sector %d\n", sector);
+		return 1;
+	}
+
+	/*
+	 *	Get the read to the beginning of a partition.
+	 */
+	sector += byte_offset >> SECTOR_BITS;
+	byte_offset &= SECTOR_SIZE - 1;
+
+	debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len);
+
+	if (zfs_block_dev_desc == NULL) {
+		printf("** Invalid Block Device Descriptor (NULL)\n");
+		return 1;
+	}
+
+	if (byte_offset != 0) {
+		/* read first part which isn't aligned with start of sector */
+		if (zfs_block_dev_desc->block_read(zfs_block_dev_desc->dev,
+										   part_info.start + sector, 1,
+										   (unsigned long *) sec_buf) != 1) {
+			printf(" ** zfs_devread() read error **\n");
+			return 1;
+		}
+		memcpy(buf, sec_buf + byte_offset,
+			   min(SECTOR_SIZE - byte_offset, byte_len));
+		buf += min(SECTOR_SIZE - byte_offset, byte_len);
+		byte_len -= min(SECTOR_SIZE - byte_offset, byte_len);
+		sector++;
+	}
+
+	if (byte_len == 0)
+		return 0;
+
+	/*	read sector aligned part */
+	block_len = byte_len & ~(SECTOR_SIZE - 1);
+
+	if (block_len == 0) {
+		u8 p[SECTOR_SIZE];
+
+		block_len = SECTOR_SIZE;
+		zfs_block_dev_desc->block_read(zfs_block_dev_desc->dev,
+									   part_info.start + sector,
+									   1, (unsigned long *)p);
+		memcpy(buf, p, byte_len);
+		return 0;
+	}
+
+	if (zfs_block_dev_desc->block_read(zfs_block_dev_desc->dev,
+									   part_info.start + sector,
+									   block_len / SECTOR_SIZE,
+									   (unsigned long *) buf) !=
+		block_len / SECTOR_SIZE) {
+		printf(" ** zfs_devread() read error - block\n");
+		return 1;
+	}
+
+	block_len = byte_len & ~(SECTOR_SIZE - 1);
+	buf += block_len;
+	byte_len -= block_len;
+	sector += block_len / SECTOR_SIZE;
+
+	if (byte_len != 0) {
+		/* read rest of data which are not in whole sector */
+		if (zfs_block_dev_desc->
+			block_read(zfs_block_dev_desc->dev,
+					   part_info.start + sector, 1,
+					   (unsigned long *) sec_buf) != 1) {
+			printf(" ** zfs_devread() read error - last part\n");
+			return 1;
+		}
+		memcpy(buf, sec_buf, byte_len);
+	}
+	return 0;
+}
diff --git a/fs/zfs/zfs.c b/fs/zfs/zfs.c
new file mode 100644
index 0000000..d6e0e23
--- /dev/null
+++ b/fs/zfs/zfs.c
@@ -0,0 +1,2396 @@
+/*
+ *
+ * ZFS filesystem ported to u-boot by
+ * Jorgen Lundman <lundman at lundman.net>
+ *
+ *	GRUB  --  GRand Unified Bootloader
+ *	Copyright (C) 1999,2000,2001,2002,2003,2004
+ *	Free Software Foundation, Inc.
+ *	Copyright 2004	Sun Microsystems, Inc.
+ *
+ *	GRUB 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 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+#include <linux/ctype.h>
+#include <asm/byteorder.h>
+#include "zfs_common.h"
+
+block_dev_desc_t *zfs_dev_desc;
+
+/*
+ * The zfs plug-in routines for GRUB are:
+ *
+ * zfs_mount() - locates a valid uberblock of the root pool and reads
+ *		in its MOS at the memory address MOS.
+ *
+ * zfs_open() - locates a plain file object by following the MOS
+ *		and places its dnode at the memory address DNODE.
+ *
+ * zfs_read() - read in the data blocks pointed by the DNODE.
+ *
+ */
+
+#include <zfs/zfs.h>
+#include <zfs/zio.h>
+#include <zfs/dnode.h>
+#include <zfs/uberblock_impl.h>
+#include <zfs/vdev_impl.h>
+#include <zfs/zio_checksum.h>
+#include <zfs/zap_impl.h>
+#include <zfs/zap_leaf.h>
+#include <zfs/zfs_znode.h>
+#include <zfs/dmu.h>
+#include <zfs/dmu_objset.h>
+#include <zfs/sa_impl.h>
+#include <zfs/dsl_dir.h>
+#include <zfs/dsl_dataset.h>
+
+
+#define	ZPOOL_PROP_BOOTFS		"bootfs"
+
+
+/*
+ * For nvlist manipulation. (from nvpair.h)
+ */
+#define	NV_ENCODE_NATIVE	0
+#define	NV_ENCODE_XDR		1
+#define	NV_BIG_ENDIAN			0
+#define	NV_LITTLE_ENDIAN	1
+#define	DATA_TYPE_UINT64	8
+#define	DATA_TYPE_STRING	9
+#define	DATA_TYPE_NVLIST	19
+#define	DATA_TYPE_NVLIST_ARRAY	20
+
+
+/*
+ * Macros to get fields in a bp or DVA.
+ */
+#define	P2PHASE(x, align)		((x) & ((align) - 1))
+#define	DVA_OFFSET_TO_PHYS_SECTOR(offset)					\
+	((offset + VDEV_LABEL_START_SIZE) >> SPA_MINBLOCKSHIFT)
+
+/*
+ * return x rounded down to an align boundary
+ * eg, P2ALIGN(1200, 1024) == 1024 (1*align)
+ * eg, P2ALIGN(1024, 1024) == 1024 (1*align)
+ * eg, P2ALIGN(0x1234, 0x100) == 0x1200 (0x12*align)
+ * eg, P2ALIGN(0x5600, 0x100) == 0x5600 (0x56*align)
+ */
+#define	P2ALIGN(x, align)		((x) & -(align))
+
+/*
+ * FAT ZAP data structures
+ */
+#define	ZFS_CRC64_POLY 0xC96C5795D7870F42ULL	/* ECMA-182, reflected form */
+#define	ZAP_HASH_IDX(hash, n)	(((n) == 0) ? 0 : ((hash) >> (64 - (n))))
+#define	CHAIN_END	0xffff	/* end of the chunk chain */
+
+/*
+ * The amount of space within the chunk available for the array is:
+ * chunk size - space for type (1) - space for next pointer (2)
+ */
+#define	ZAP_LEAF_ARRAY_BYTES (ZAP_LEAF_CHUNKSIZE - 3)
+
+#define	ZAP_LEAF_HASH_SHIFT(bs)	(bs - 5)
+#define	ZAP_LEAF_HASH_NUMENTRIES(bs) (1 << ZAP_LEAF_HASH_SHIFT(bs))
+#define	LEAF_HASH(bs, h)												\
+	((ZAP_LEAF_HASH_NUMENTRIES(bs)-1) &									\
+	 ((h) >> (64 - ZAP_LEAF_HASH_SHIFT(bs)-l->l_hdr.lh_prefix_len)))
+
+/*
+ * The amount of space available for chunks is:
+ * block size shift - hash entry size (2) * number of hash
+ * entries - header space (2*chunksize)
+ */
+#define	ZAP_LEAF_NUMCHUNKS(bs)						\
+	(((1<<bs) - 2*ZAP_LEAF_HASH_NUMENTRIES(bs)) /	\
+	 ZAP_LEAF_CHUNKSIZE - 2)
+
+/*
+ * The chunks start immediately after the hash table.  The end of the
+ * hash table is at l_hash + HASH_NUMENTRIES, which we simply cast to a
+ * chunk_t.
+ */
+#define	ZAP_LEAF_CHUNK(l, bs, idx)										\
+	((zap_leaf_chunk_t *)(l->l_hash + ZAP_LEAF_HASH_NUMENTRIES(bs)))[idx]
+#define	ZAP_LEAF_ENTRY(l, bs, idx) (&ZAP_LEAF_CHUNK(l, bs, idx).l_entry)
+
+
+/*
+ * Decompression Entry - lzjb
+ */
+#ifndef	NBBY
+#define	NBBY	8
+#endif
+
+
+
+typedef int zfs_decomp_func_t(void *s_start, void *d_start,
+							  uint32_t s_len, uint32_t d_len);
+typedef struct decomp_entry {
+	char *name;
+	zfs_decomp_func_t *decomp_func;
+} decomp_entry_t;
+
+typedef struct dnode_end {
+	dnode_phys_t dn;
+	grub_zfs_endian_t endian;
+} dnode_end_t;
+
+struct grub_zfs_data {
+	/* cache for a file block of the currently zfs_open()-ed file */
+	char *file_buf;
+	uint64_t file_start;
+	uint64_t file_end;
+
+	/* XXX: ashift is per vdev, not per pool.  We currently only ever touch
+	 * a single vdev, but when/if raid-z or stripes are supported, this
+	 * may need revision.
+	 */
+	uint64_t vdev_ashift;
+	uint64_t label_txg;
+	uint64_t pool_guid;
+
+	/* cache for a dnode block */
+	dnode_phys_t *dnode_buf;
+	dnode_phys_t *dnode_mdn;
+	uint64_t dnode_start;
+	uint64_t dnode_end;
+	grub_zfs_endian_t dnode_endian;
+
+	uberblock_t current_uberblock;
+
+	dnode_end_t mos;
+	dnode_end_t mdn;
+	dnode_end_t dnode;
+
+	uint64_t vdev_phys_sector;
+
+	int (*userhook)(const char *, const struct zfs_dirhook_info *);
+	struct zfs_dirhook_info *dirinfo;
+
+};
+
+
+
+
+static int
+zlib_decompress(void *s, void *d,
+				uint32_t slen, uint32_t dlen)
+{
+	if (zlib_decompress(s, d, slen, dlen) < 0)
+		return ZFS_ERR_BAD_FS;
+	return ZFS_ERR_NONE;
+}
+
+static decomp_entry_t decomp_table[ZIO_COMPRESS_FUNCTIONS] = {
+	{"inherit", NULL},		/* ZIO_COMPRESS_INHERIT */
+	{"on", lzjb_decompress},	/* ZIO_COMPRESS_ON */
+	{"off", NULL},		/* ZIO_COMPRESS_OFF */
+	{"lzjb", lzjb_decompress},	/* ZIO_COMPRESS_LZJB */
+	{"empty", NULL},		/* ZIO_COMPRESS_EMPTY */
+	{"gzip-1", zlib_decompress},  /* ZIO_COMPRESS_GZIP1 */
+	{"gzip-2", zlib_decompress},  /* ZIO_COMPRESS_GZIP2 */
+	{"gzip-3", zlib_decompress},  /* ZIO_COMPRESS_GZIP3 */
+	{"gzip-4", zlib_decompress},  /* ZIO_COMPRESS_GZIP4 */
+	{"gzip-5", zlib_decompress},  /* ZIO_COMPRESS_GZIP5 */
+	{"gzip-6", zlib_decompress},  /* ZIO_COMPRESS_GZIP6 */
+	{"gzip-7", zlib_decompress},  /* ZIO_COMPRESS_GZIP7 */
+	{"gzip-8", zlib_decompress},  /* ZIO_COMPRESS_GZIP8 */
+	{"gzip-9", zlib_decompress},  /* ZIO_COMPRESS_GZIP9 */
+};
+
+
+
+static int zio_read_data(blkptr_t *bp, grub_zfs_endian_t endian,
+						 void *buf, struct grub_zfs_data *data);
+
+static int
+zio_read(blkptr_t *bp, grub_zfs_endian_t endian, void **buf,
+		 size_t *size, struct grub_zfs_data *data);
+
+/*
+ * Our own version of log2().  Same thing as highbit()-1.
+ */
+static int
+zfs_log2(uint64_t num)
+{
+	int i = 0;
+
+	while (num > 1) {
+		i++;
+		num = num >> 1;
+	}
+
+	return i;
+}
+
+
+/* Checksum Functions */
+static void
+zio_checksum_off(const void *buf __attribute__ ((unused)),
+				 uint64_t size __attribute__ ((unused)),
+				 grub_zfs_endian_t endian __attribute__ ((unused)),
+				 zio_cksum_t *zcp)
+{
+	ZIO_SET_CHECKSUM(zcp, 0, 0, 0, 0);
+}
+
+/* Checksum Table and Values */
+static zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS] = {
+	{NULL, 0, 0, "inherit"},
+	{NULL, 0, 0, "on"},
+	{zio_checksum_off, 0, 0, "off"},
+	{zio_checksum_SHA256, 1, 1, "label"},
+	{zio_checksum_SHA256, 1, 1, "gang_header"},
+	{NULL, 0, 0, "zilog"},
+	{fletcher_2, 0, 0, "fletcher2"},
+	{fletcher_4, 1, 0, "fletcher4"},
+	{zio_checksum_SHA256, 1, 0, "SHA256"},
+	{NULL, 0, 0, "zilog2"},
+};
+
+/*
+ * zio_checksum_verify: Provides support for checksum verification.
+ *
+ * Fletcher2, Fletcher4, and SHA256 are supported.
+ *
+ */
+static int
+zio_checksum_verify(zio_cksum_t zc, uint32_t checksum,
+					grub_zfs_endian_t endian, char *buf, int size)
+{
+	zio_eck_t *zec = (zio_eck_t *) (buf + size) - 1;
+	zio_checksum_info_t *ci = &zio_checksum_table[checksum];
+	zio_cksum_t actual_cksum, expected_cksum;
+
+	if (checksum >= ZIO_CHECKSUM_FUNCTIONS || ci->ci_func == NULL) {
+		printf("zfs unknown checksum function %d\n", checksum);
+		return ZFS_ERR_NOT_IMPLEMENTED_YET;
+	}
+
+	if (ci->ci_eck) {
+		expected_cksum = zec->zec_cksum;
+		zec->zec_cksum = zc;
+		ci->ci_func(buf, size, endian, &actual_cksum);
+		zec->zec_cksum = expected_cksum;
+		zc = expected_cksum;
+	} else {
+		ci->ci_func(buf, size, endian, &actual_cksum);
+	}
+
+	if ((actual_cksum.zc_word[0] != zc.zc_word[0])
+		|| (actual_cksum.zc_word[1] != zc.zc_word[1])
+		|| (actual_cksum.zc_word[2] != zc.zc_word[2])
+		|| (actual_cksum.zc_word[3] != zc.zc_word[3])) {
+		return ZFS_ERR_BAD_FS;
+	}
+
+	return ZFS_ERR_NONE;
+}
+
+/*
+ * vdev_uberblock_compare takes two uberblock structures and returns an integer
+ * indicating the more recent of the two.
+ *	Return Value = 1 if ub2 is more recent
+ *	Return Value = -1 if ub1 is more recent
+ * The most recent uberblock is determined using its transaction number and
+ * timestamp.  The uberblock with the highest transaction number is
+ * considered "newer".	If the transaction numbers of the two blocks match, the
+ * timestamps are compared to determine the "newer" of the two.
+ */
+static int
+vdev_uberblock_compare(uberblock_t *ub1, uberblock_t *ub2)
+{
+	grub_zfs_endian_t ub1_endian, ub2_endian;
+	if (grub_zfs_to_cpu64(ub1->ub_magic, LITTLE_ENDIAN) == UBERBLOCK_MAGIC)
+		ub1_endian = LITTLE_ENDIAN;
+	else
+		ub1_endian = BIG_ENDIAN;
+	if (grub_zfs_to_cpu64(ub2->ub_magic, LITTLE_ENDIAN) == UBERBLOCK_MAGIC)
+		ub2_endian = LITTLE_ENDIAN;
+	else
+		ub2_endian = BIG_ENDIAN;
+
+	if (grub_zfs_to_cpu64(ub1->ub_txg, ub1_endian)
+		< grub_zfs_to_cpu64(ub2->ub_txg, ub2_endian))
+		return -1;
+	if (grub_zfs_to_cpu64(ub1->ub_txg, ub1_endian)
+		> grub_zfs_to_cpu64(ub2->ub_txg, ub2_endian))
+		return 1;
+
+	if (grub_zfs_to_cpu64(ub1->ub_timestamp, ub1_endian)
+		< grub_zfs_to_cpu64(ub2->ub_timestamp, ub2_endian))
+		return -1;
+	if (grub_zfs_to_cpu64(ub1->ub_timestamp, ub1_endian)
+		> grub_zfs_to_cpu64(ub2->ub_timestamp, ub2_endian))
+		return 1;
+
+	return 0;
+}
+
+/*
+ * Three pieces of information are needed to verify an uberblock: the magic
+ * number, the version number, and the checksum.
+ *
+ * Currently Implemented: version number, magic number, label txg
+ * Need to Implement: checksum
+ *
+ */
+static int
+uberblock_verify(uberblock_t *uber, int offset, struct grub_zfs_data *data)
+{
+	int err;
+	grub_zfs_endian_t endian = UNKNOWN_ENDIAN;
+	zio_cksum_t zc;
+
+	if (uber->ub_txg < data->label_txg) {
+		debug("ignoring partially written label: uber_txg < label_txg %llu %llu\n",
+			  uber->ub_txg, data->label_txg);
+		return ZFS_ERR_BAD_FS;
+	}
+
+	if (grub_zfs_to_cpu64(uber->ub_magic, LITTLE_ENDIAN) == UBERBLOCK_MAGIC
+		&& grub_zfs_to_cpu64(uber->ub_version, LITTLE_ENDIAN) > 0
+		&& grub_zfs_to_cpu64(uber->ub_version, LITTLE_ENDIAN) <= SPA_VERSION)
+		endian = LITTLE_ENDIAN;
+
+	if (grub_zfs_to_cpu64(uber->ub_magic, BIG_ENDIAN) == UBERBLOCK_MAGIC
+		&& grub_zfs_to_cpu64(uber->ub_version, BIG_ENDIAN) > 0
+		&& grub_zfs_to_cpu64(uber->ub_version, BIG_ENDIAN) <= SPA_VERSION)
+		endian = BIG_ENDIAN;
+
+	if (endian == UNKNOWN_ENDIAN) {
+		printf("invalid uberblock magic\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	memset(&zc, 0, sizeof(zc));
+	zc.zc_word[0] = grub_cpu_to_zfs64(offset, endian);
+	err = zio_checksum_verify(zc, ZIO_CHECKSUM_LABEL, endian,
+							  (char *) uber, UBERBLOCK_SIZE(data->vdev_ashift));
+
+	if (!err) {
+		/* Check that the data pointed by the rootbp is usable. */
+		void *osp = NULL;
+		size_t ospsize;
+		err = zio_read(&uber->ub_rootbp, endian, &osp, &ospsize, data);
+		free(osp);
+
+		if (!err && ospsize < OBJSET_PHYS_SIZE_V14) {
+			printf("uberblock rootbp points to invalid data\n");
+			return ZFS_ERR_BAD_FS;
+		}
+	}
+
+	return err;
+}
+
+/*
+ * Find the best uberblock.
+ * Return:
+ *	  Success - Pointer to the best uberblock.
+ *	  Failure - NULL
+ */
+static uberblock_t *find_bestub(char *ub_array, struct grub_zfs_data *data)
+{
+	const uint64_t sector = data->vdev_phys_sector;
+	uberblock_t *ubbest = NULL;
+	uberblock_t *ubnext;
+	unsigned int i, offset, pickedub = 0;
+	int err = ZFS_ERR_NONE;
+
+	const unsigned int UBCOUNT = UBERBLOCK_COUNT(data->vdev_ashift);
+	const uint64_t UBBYTES = UBERBLOCK_SIZE(data->vdev_ashift);
+
+	for (i = 0; i < UBCOUNT; i++) {
+		ubnext = (uberblock_t *) (i * UBBYTES + ub_array);
+		offset = (sector << SPA_MINBLOCKSHIFT) + VDEV_PHYS_SIZE + (i * UBBYTES);
+
+		err = uberblock_verify(ubnext, offset, data);
+		if (err)
+			continue;
+
+		if (ubbest == NULL || vdev_uberblock_compare(ubnext, ubbest) > 0) {
+			ubbest = ubnext;
+			pickedub = i;
+		}
+	}
+
+	if (ubbest)
+		debug("zfs Found best uberblock at idx %d, txg %llu\n",
+			  pickedub, (unsigned long long) ubbest->ub_txg);
+
+	return ubbest;
+}
+
+static inline size_t
+get_psize(blkptr_t *bp, grub_zfs_endian_t endian)
+{
+	return (((grub_zfs_to_cpu64((bp)->blk_prop, endian) >> 16) & 0xffff) + 1)
+			<< SPA_MINBLOCKSHIFT;
+}
+
+static uint64_t
+dva_get_offset(dva_t *dva, grub_zfs_endian_t endian)
+{
+	return grub_zfs_to_cpu64((dva)->dva_word[1],
+							 endian) << SPA_MINBLOCKSHIFT;
+}
+
+/*
+ * Read a block of data based on the gang block address dva,
+ * and put its data in buf.
+ *
+ */
+static int
+zio_read_gang(blkptr_t *bp, grub_zfs_endian_t endian, dva_t *dva, void *buf,
+			  struct grub_zfs_data *data)
+{
+	zio_gbh_phys_t *zio_gb;
+	uint64_t offset, sector;
+	unsigned i;
+	int err;
+	zio_cksum_t zc;
+
+	memset(&zc, 0, sizeof(zc));
+
+	zio_gb = malloc(SPA_GANGBLOCKSIZE);
+	if (!zio_gb)
+		return ZFS_ERR_OUT_OF_MEMORY;
+
+	offset = dva_get_offset(dva, endian);
+	sector = DVA_OFFSET_TO_PHYS_SECTOR(offset);
+
+	/* read in the gang block header */
+	err = zfs_devread(sector, 0, SPA_GANGBLOCKSIZE, (char *) zio_gb);
+
+	if (err) {
+		free(zio_gb);
+		return err;
+	}
+
+	/* XXX */
+	/* self checksuming the gang block header */
+	ZIO_SET_CHECKSUM(&zc, DVA_GET_VDEV(dva),
+					 dva_get_offset(dva, endian), bp->blk_birth, 0);
+	err = zio_checksum_verify(zc, ZIO_CHECKSUM_GANG_HEADER, endian,
+							  (char *) zio_gb, SPA_GANGBLOCKSIZE);
+	if (err) {
+		free(zio_gb);
+		return err;
+	}
+
+	endian = (grub_zfs_to_cpu64(bp->blk_prop, endian) >> 63) & 1;
+
+	for (i = 0; i < SPA_GBH_NBLKPTRS; i++) {
+		if (zio_gb->zg_blkptr[i].blk_birth == 0)
+			continue;
+
+		err = zio_read_data(&zio_gb->zg_blkptr[i], endian, buf, data);
+		if (err) {
+			free(zio_gb);
+			return err;
+		}
+		buf = (char *) buf + get_psize(&zio_gb->zg_blkptr[i], endian);
+	}
+	free(zio_gb);
+	return ZFS_ERR_NONE;
+}
+
+/*
+ * Read in a block of raw data to buf.
+ */
+static int
+zio_read_data(blkptr_t *bp, grub_zfs_endian_t endian, void *buf,
+			  struct grub_zfs_data *data)
+{
+	int i, psize;
+	int err = ZFS_ERR_NONE;
+
+	psize = get_psize(bp, endian);
+
+	/* pick a good dva from the block pointer */
+	for (i = 0; i < SPA_DVAS_PER_BP; i++) {
+		uint64_t offset, sector;
+
+		if (bp->blk_dva[i].dva_word[0] == 0 && bp->blk_dva[i].dva_word[1] == 0)
+			continue;
+
+		if ((grub_zfs_to_cpu64(bp->blk_dva[i].dva_word[1], endian)>>63) & 1) {
+			err = zio_read_gang(bp, endian, &bp->blk_dva[i], buf, data);
+		} else {
+			/* read in a data block */
+			offset = dva_get_offset(&bp->blk_dva[i], endian);
+			sector = DVA_OFFSET_TO_PHYS_SECTOR(offset);
+
+			err = zfs_devread(sector, 0, psize, buf);
+		}
+
+		if (!err) {
+			/*Check the underlying checksum before we rule this DVA as "good"*/
+			uint32_t checkalgo = (grub_zfs_to_cpu64((bp)->blk_prop, endian) >> 40) & 0xff;
+
+			err = zio_checksum_verify(bp->blk_cksum, checkalgo, endian, buf, psize);
+			if (!err)
+				return ZFS_ERR_NONE;
+		}
+
+		/* If read failed or checksum bad, reset the error.	 Hopefully we've got some more DVA's to try.*/
+	}
+
+	if (!err) {
+		printf("couldn't find a valid DVA\n");
+		err = ZFS_ERR_BAD_FS;
+	}
+
+	return err;
+}
+
+/*
+ * Read in a block of data, verify its checksum, decompress if needed,
+ * and put the uncompressed data in buf.
+ */
+static int
+zio_read(blkptr_t *bp, grub_zfs_endian_t endian, void **buf,
+		 size_t *size, struct grub_zfs_data *data)
+{
+	size_t lsize, psize;
+	unsigned int comp;
+	char *compbuf = NULL;
+	int err;
+
+	*buf = NULL;
+
+	comp = (grub_zfs_to_cpu64((bp)->blk_prop, endian)>>32) & 0xff;
+	lsize = (BP_IS_HOLE(bp) ? 0 :
+			 (((grub_zfs_to_cpu64((bp)->blk_prop, endian) & 0xffff) + 1)
+			  << SPA_MINBLOCKSHIFT));
+	psize = get_psize(bp, endian);
+
+	if (size)
+		*size = lsize;
+
+	if (comp >= ZIO_COMPRESS_FUNCTIONS) {
+		printf("compression algorithm %u not supported\n", (unsigned int) comp);
+		return ZFS_ERR_NOT_IMPLEMENTED_YET;
+	}
+
+	if (comp != ZIO_COMPRESS_OFF && decomp_table[comp].decomp_func == NULL) {
+		printf("compression algorithm %s not supported\n", decomp_table[comp].name);
+		return ZFS_ERR_NOT_IMPLEMENTED_YET;
+	}
+
+	if (comp != ZIO_COMPRESS_OFF) {
+		compbuf = malloc(psize);
+		if (!compbuf)
+			return ZFS_ERR_OUT_OF_MEMORY;
+	} else {
+		compbuf = *buf = malloc(lsize);
+	}
+
+	err = zio_read_data(bp, endian, compbuf, data);
+	if (err) {
+		free(compbuf);
+		*buf = NULL;
+		return err;
+	}
+
+	if (comp != ZIO_COMPRESS_OFF) {
+		*buf = malloc(lsize);
+		if (!*buf) {
+			free(compbuf);
+			return ZFS_ERR_OUT_OF_MEMORY;
+		}
+
+		err = decomp_table[comp].decomp_func(compbuf, *buf, psize, lsize);
+		free(compbuf);
+		if (err) {
+			free(*buf);
+			*buf = NULL;
+			return err;
+		}
+	}
+
+	return ZFS_ERR_NONE;
+}
+
+/*
+ * Get the block from a block id.
+ * push the block onto the stack.
+ *
+ */
+static int
+dmu_read(dnode_end_t *dn, uint64_t blkid, void **buf,
+		 grub_zfs_endian_t *endian_out, struct grub_zfs_data *data)
+{
+	int idx, level;
+	blkptr_t *bp_array = dn->dn.dn_blkptr;
+	int epbs = dn->dn.dn_indblkshift - SPA_BLKPTRSHIFT;
+	blkptr_t *bp;
+	void *tmpbuf = 0;
+	grub_zfs_endian_t endian;
+	int err = ZFS_ERR_NONE;
+
+	bp = malloc(sizeof(blkptr_t));
+	if (!bp)
+		return ZFS_ERR_OUT_OF_MEMORY;
+
+	endian = dn->endian;
+	for (level = dn->dn.dn_nlevels - 1; level >= 0; level--) {
+		idx = (blkid >> (epbs * level)) & ((1 << epbs) - 1);
+		*bp = bp_array[idx];
+		if (bp_array != dn->dn.dn_blkptr) {
+			free(bp_array);
+			bp_array = 0;
+		}
+
+		if (BP_IS_HOLE(bp)) {
+			size_t size = grub_zfs_to_cpu16(dn->dn.dn_datablkszsec,
+											dn->endian)
+				<< SPA_MINBLOCKSHIFT;
+			*buf = malloc(size);
+			if (*buf) {
+				err = ZFS_ERR_OUT_OF_MEMORY;
+				break;
+			}
+			memset(*buf, 0, size);
+			endian = (grub_zfs_to_cpu64(bp->blk_prop, endian) >> 63) & 1;
+			break;
+		}
+		if (level == 0) {
+			err = zio_read(bp, endian, buf, 0, data);
+			endian = (grub_zfs_to_cpu64(bp->blk_prop, endian) >> 63) & 1;
+			break;
+		}
+		err = zio_read(bp, endian, &tmpbuf, 0, data);
+		endian = (grub_zfs_to_cpu64(bp->blk_prop, endian) >> 63) & 1;
+		if (err)
+			break;
+		bp_array = tmpbuf;
+	}
+	if (bp_array != dn->dn.dn_blkptr)
+		free(bp_array);
+	if (endian_out)
+		*endian_out = endian;
+
+	free(bp);
+	return err;
+}
+
+/*
+ * mzap_lookup: Looks up property described by "name" and returns the value
+ * in "value".
+ */
+static int
+mzap_lookup(mzap_phys_t *zapobj, grub_zfs_endian_t endian,
+			int objsize, char *name, uint64_t * value)
+{
+	int i, chunks;
+	mzap_ent_phys_t *mzap_ent = zapobj->mz_chunk;
+
+	chunks = objsize / MZAP_ENT_LEN - 1;
+	for (i = 0; i < chunks; i++) {
+		if (strcmp(mzap_ent[i].mze_name, name) == 0) {
+			*value = grub_zfs_to_cpu64(mzap_ent[i].mze_value, endian);
+			return ZFS_ERR_NONE;
+		}
+	}
+
+	printf("couldn't find '%s'\n", name);
+	return ZFS_ERR_FILE_NOT_FOUND;
+}
+
+static int
+mzap_iterate(mzap_phys_t *zapobj, grub_zfs_endian_t endian, int objsize,
+			 int (*hook)(const char *name,
+						 uint64_t val,
+						 struct grub_zfs_data *data),
+			 struct grub_zfs_data *data)
+{
+	int i, chunks;
+	mzap_ent_phys_t *mzap_ent = zapobj->mz_chunk;
+
+	chunks = objsize / MZAP_ENT_LEN - 1;
+	for (i = 0; i < chunks; i++) {
+		if (hook(mzap_ent[i].mze_name,
+				 grub_zfs_to_cpu64(mzap_ent[i].mze_value, endian),
+				 data))
+			return 1;
+	}
+
+	return 0;
+}
+
+static uint64_t
+zap_hash(uint64_t salt, const char *name)
+{
+	static uint64_t table[256];
+	const uint8_t *cp;
+	uint8_t c;
+	uint64_t crc = salt;
+
+	if (table[128] == 0) {
+		uint64_t *ct;
+		int i, j;
+		for (i = 0; i < 256; i++) {
+			for (ct = table + i, *ct = i, j = 8; j > 0; j--)
+				*ct = (*ct >> 1) ^ (-(*ct & 1) & ZFS_CRC64_POLY);
+		}
+	}
+
+	for (cp = (const uint8_t *) name; (c = *cp) != '\0'; cp++)
+		crc = (crc >> 8) ^ table[(crc ^ c) & 0xFF];
+
+	/*
+	 * Only use 28 bits, since we need 4 bits in the cookie for the
+	 * collision differentiator.  We MUST use the high bits, since
+	 * those are the onces that we first pay attention to when
+	 * chosing the bucket.
+	 */
+	crc &= ~((1ULL << (64 - ZAP_HASHBITS)) - 1);
+
+	return crc;
+}
+
+/*
+ * Only to be used on 8-bit arrays.
+ * array_len is actual len in bytes (not encoded le_value_length).
+ * buf is null-terminated.
+ */
+/* XXX */
+static int
+zap_leaf_array_equal(zap_leaf_phys_t *l, grub_zfs_endian_t endian,
+					 int blksft, int chunk, int array_len, const char *buf)
+{
+	int bseen = 0;
+
+	while (bseen < array_len) {
+		struct zap_leaf_array *la = &ZAP_LEAF_CHUNK(l, blksft, chunk).l_array;
+		int toread = MIN(array_len - bseen, ZAP_LEAF_ARRAY_BYTES);
+
+		if (chunk >= ZAP_LEAF_NUMCHUNKS(blksft))
+			return 0;
+
+		if (memcmp(la->la_array, buf + bseen, toread) != 0)
+			break;
+		chunk = grub_zfs_to_cpu16(la->la_next, endian);
+		bseen += toread;
+	}
+	return (bseen == array_len);
+}
+
+/* XXX */
+static int
+zap_leaf_array_get(zap_leaf_phys_t *l, grub_zfs_endian_t endian, int blksft,
+				   int chunk, int array_len, char *buf)
+{
+	int bseen = 0;
+
+	while (bseen < array_len) {
+		struct zap_leaf_array *la = &ZAP_LEAF_CHUNK(l, blksft, chunk).l_array;
+		int toread = MIN(array_len - bseen, ZAP_LEAF_ARRAY_BYTES);
+
+		if (chunk >= ZAP_LEAF_NUMCHUNKS(blksft))
+			/* Don't use errno because this error is to be ignored.  */
+			return ZFS_ERR_BAD_FS;
+
+		memcpy(buf + bseen, la->la_array,  toread);
+		chunk = grub_zfs_to_cpu16(la->la_next, endian);
+		bseen += toread;
+	}
+	return ZFS_ERR_NONE;
+}
+
+
+/*
+ * Given a zap_leaf_phys_t, walk thru the zap leaf chunks to get the
+ * value for the property "name".
+ *
+ */
+/* XXX */
+static int
+zap_leaf_lookup(zap_leaf_phys_t *l, grub_zfs_endian_t endian,
+				int blksft, uint64_t h,
+				const char *name, uint64_t *value)
+{
+	uint16_t chunk;
+	struct zap_leaf_entry *le;
+
+	/* Verify if this is a valid leaf block */
+	if (grub_zfs_to_cpu64(l->l_hdr.lh_block_type, endian) != ZBT_LEAF) {
+		printf("invalid leaf type\n");
+		return ZFS_ERR_BAD_FS;
+	}
+	if (grub_zfs_to_cpu32(l->l_hdr.lh_magic, endian) != ZAP_LEAF_MAGIC) {
+		printf("invalid leaf magic\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	for (chunk = grub_zfs_to_cpu16(l->l_hash[LEAF_HASH(blksft, h)], endian);
+		 chunk != CHAIN_END; chunk = le->le_next) {
+
+		if (chunk >= ZAP_LEAF_NUMCHUNKS(blksft)) {
+			printf("invalid chunk number\n");
+			return ZFS_ERR_BAD_FS;
+		}
+
+		le = ZAP_LEAF_ENTRY(l, blksft, chunk);
+
+		/* Verify the chunk entry */
+		if (le->le_type != ZAP_CHUNK_ENTRY) {
+			printf("invalid chunk entry\n");
+			return ZFS_ERR_BAD_FS;
+		}
+
+		if (grub_zfs_to_cpu64(le->le_hash, endian) != h)
+			continue;
+
+		if (zap_leaf_array_equal(l, endian, blksft,
+								 grub_zfs_to_cpu16(le->le_name_chunk, endian),
+								 grub_zfs_to_cpu16(le->le_name_length, endian),
+								 name)) {
+			struct zap_leaf_array *la;
+
+			if (le->le_int_size != 8 || le->le_value_length != 1) {
+				printf("invalid leaf chunk entry\n");
+				return ZFS_ERR_BAD_FS;
+			}
+			/* get the uint64_t property value */
+			la = &ZAP_LEAF_CHUNK(l, blksft, le->le_value_chunk).l_array;
+
+			*value = grub_be_to_cpu64(la->la_array64);
+
+			return ZFS_ERR_NONE;
+		}
+	}
+
+	printf("couldn't find '%s'\n", name);
+	return ZFS_ERR_FILE_NOT_FOUND;
+}
+
+
+/* Verify if this is a fat zap header block */
+static int
+zap_verify(zap_phys_t *zap)
+{
+	if (zap->zap_magic != (uint64_t) ZAP_MAGIC) {
+		printf("bad ZAP magic\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	if (zap->zap_flags != 0) {
+		printf("bad ZAP flags\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	if (zap->zap_salt == 0) {
+		printf("bad ZAP salt\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	return ZFS_ERR_NONE;
+}
+
+/*
+ * Fat ZAP lookup
+ *
+ */
+/* XXX */
+static int
+fzap_lookup(dnode_end_t *zap_dnode, zap_phys_t *zap,
+			char *name, uint64_t *value, struct grub_zfs_data *data)
+{
+	void *l;
+	uint64_t hash, idx, blkid;
+	int blksft = zfs_log2(grub_zfs_to_cpu16(zap_dnode->dn.dn_datablkszsec,
+											zap_dnode->endian) << DNODE_SHIFT);
+	int err;
+	grub_zfs_endian_t leafendian;
+
+	err = zap_verify(zap);
+	if (err)
+		return err;
+
+	hash = zap_hash(zap->zap_salt, name);
+
+	/* get block id from index */
+	if (zap->zap_ptrtbl.zt_numblks != 0) {
+		printf("external pointer tables not supported\n");
+		return ZFS_ERR_NOT_IMPLEMENTED_YET;
+	}
+	idx = ZAP_HASH_IDX(hash, zap->zap_ptrtbl.zt_shift);
+	blkid = ((uint64_t *) zap)[idx + (1 << (blksft - 3 - 1))];
+
+	/* Get the leaf block */
+	if ((1U << blksft) < sizeof(zap_leaf_phys_t)) {
+		printf("ZAP leaf is too small\n");
+		return ZFS_ERR_BAD_FS;
+	}
+	err = dmu_read(zap_dnode, blkid, &l, &leafendian, data);
+	if (err)
+		return err;
+
+	err = zap_leaf_lookup(l, leafendian, blksft, hash, name, value);
+	free(l);
+	return err;
+}
+
+/* XXX */
+static int
+fzap_iterate(dnode_end_t *zap_dnode, zap_phys_t *zap,
+			 int (*hook)(const char *name,
+						 uint64_t val,
+						 struct grub_zfs_data *data),
+			 struct grub_zfs_data *data)
+{
+	zap_leaf_phys_t *l;
+	void *l_in;
+	uint64_t idx, blkid;
+	uint16_t chunk;
+	int blksft = zfs_log2(grub_zfs_to_cpu16(zap_dnode->dn.dn_datablkszsec,
+											zap_dnode->endian) << DNODE_SHIFT);
+	int err;
+	grub_zfs_endian_t endian;
+
+	if (zap_verify(zap))
+		return 0;
+
+	/* get block id from index */
+	if (zap->zap_ptrtbl.zt_numblks != 0) {
+		printf("external pointer tables not supported\n");
+		return 0;
+	}
+	/* Get the leaf block */
+	if ((1U << blksft) < sizeof(zap_leaf_phys_t)) {
+		printf("ZAP leaf is too small\n");
+		return 0;
+	}
+	for (idx = 0; idx < zap->zap_ptrtbl.zt_numblks; idx++) {
+		blkid = ((uint64_t *) zap)[idx + (1 << (blksft - 3 - 1))];
+
+		err = dmu_read(zap_dnode, blkid, &l_in, &endian, data);
+		l = l_in;
+		if (err)
+			continue;
+
+		/* Verify if this is a valid leaf block */
+		if (grub_zfs_to_cpu64(l->l_hdr.lh_block_type, endian) != ZBT_LEAF) {
+			free(l);
+			continue;
+		}
+		if (grub_zfs_to_cpu32(l->l_hdr.lh_magic, endian) != ZAP_LEAF_MAGIC) {
+			free(l);
+			continue;
+		}
+
+		for (chunk = 0; chunk < ZAP_LEAF_NUMCHUNKS(blksft); chunk++) {
+			char *buf;
+			struct zap_leaf_array *la;
+			struct zap_leaf_entry *le;
+			uint64_t val;
+			le = ZAP_LEAF_ENTRY(l, blksft, chunk);
+
+			/* Verify the chunk entry */
+			if (le->le_type != ZAP_CHUNK_ENTRY)
+				continue;
+
+			buf = malloc(grub_zfs_to_cpu16(le->le_name_length, endian)
+						 + 1);
+			if (zap_leaf_array_get(l, endian, blksft, le->le_name_chunk,
+								   le->le_name_length, buf)) {
+				free(buf);
+				continue;
+			}
+			buf[le->le_name_length] = 0;
+
+			if (le->le_int_size != 8
+				|| grub_zfs_to_cpu16(le->le_value_length, endian) != 1)
+				continue;
+
+			/* get the uint64_t property value */
+			la = &ZAP_LEAF_CHUNK(l, blksft, le->le_value_chunk).l_array;
+			val = grub_be_to_cpu64(la->la_array64);
+			if (hook(buf, val, data))
+				return 1;
+			free(buf);
+		}
+	}
+	return 0;
+}
+
+
+/*
+ * Read in the data of a zap object and find the value for a matching
+ * property name.
+ *
+ */
+static int
+zap_lookup(dnode_end_t *zap_dnode, char *name, uint64_t *val,
+		   struct grub_zfs_data *data)
+{
+	uint64_t block_type;
+	int size;
+	void *zapbuf;
+	int err;
+	grub_zfs_endian_t endian;
+
+	/* Read in the first block of the zap object data. */
+	size = grub_zfs_to_cpu16(zap_dnode->dn.dn_datablkszsec,
+							 zap_dnode->endian) << SPA_MINBLOCKSHIFT;
+	err = dmu_read(zap_dnode, 0, &zapbuf, &endian, data);
+	if (err)
+		return err;
+	block_type = grub_zfs_to_cpu64(*((uint64_t *) zapbuf), endian);
+
+	if (block_type == ZBT_MICRO) {
+		err = (mzap_lookup(zapbuf, endian, size, name, val));
+		free(zapbuf);
+		return err;
+	} else if (block_type == ZBT_HEADER) {
+		/* this is a fat zap */
+		err = (fzap_lookup(zap_dnode, zapbuf, name, val, data));
+		free(zapbuf);
+		return err;
+	}
+
+	printf("unknown ZAP type\n");
+	return ZFS_ERR_BAD_FS;
+}
+
+static int
+zap_iterate(dnode_end_t *zap_dnode,
+			int (*hook)(const char *name, uint64_t val,
+						struct grub_zfs_data *data),
+			struct grub_zfs_data *data)
+{
+	uint64_t block_type;
+	int size;
+	void *zapbuf;
+	int err;
+	int ret;
+	grub_zfs_endian_t endian;
+
+	/* Read in the first block of the zap object data. */
+	size = grub_zfs_to_cpu16(zap_dnode->dn.dn_datablkszsec, zap_dnode->endian) << SPA_MINBLOCKSHIFT;
+	err = dmu_read(zap_dnode, 0, &zapbuf, &endian, data);
+	if (err)
+		return 0;
+	block_type = grub_zfs_to_cpu64(*((uint64_t *) zapbuf), endian);
+
+	if (block_type == ZBT_MICRO) {
+		ret = mzap_iterate(zapbuf, endian, size, hook, data);
+		free(zapbuf);
+		return ret;
+	} else if (block_type == ZBT_HEADER) {
+		/* this is a fat zap */
+		ret = fzap_iterate(zap_dnode, zapbuf, hook, data);
+		free(zapbuf);
+		return ret;
+	}
+	printf("unknown ZAP type\n");
+	return 0;
+}
+
+
+/*
+ * Get the dnode of an object number from the metadnode of an object set.
+ *
+ * Input
+ *	mdn - metadnode to get the object dnode
+ *	objnum - object number for the object dnode
+ *	buf - data buffer that holds the returning dnode
+ */
+static int
+dnode_get(dnode_end_t *mdn, uint64_t objnum, uint8_t type,
+		  dnode_end_t *buf, struct grub_zfs_data *data)
+{
+	uint64_t blkid, blksz;	/* the block id this object dnode is in */
+	int epbs;			/* shift of number of dnodes in a block */
+	int idx;			/* index within a block */
+	void *dnbuf;
+	int err;
+	grub_zfs_endian_t endian;
+
+	blksz = grub_zfs_to_cpu16(mdn->dn.dn_datablkszsec,
+							  mdn->endian) << SPA_MINBLOCKSHIFT;
+
+	epbs = zfs_log2(blksz) - DNODE_SHIFT;
+	blkid = objnum >> epbs;
+	idx = objnum & ((1 << epbs) - 1);
+
+	if (data->dnode_buf != NULL && memcmp(data->dnode_mdn, mdn,
+										  sizeof(*mdn)) == 0
+		&& objnum >= data->dnode_start && objnum < data->dnode_end) {
+		memmove(&(buf->dn), &(data->dnode_buf)[idx], DNODE_SIZE);
+		buf->endian = data->dnode_endian;
+		if (type && buf->dn.dn_type != type)  {
+			printf("incorrect dnode type: %02X != %02x\n", buf->dn.dn_type, type);
+			return ZFS_ERR_BAD_FS;
+		}
+		return ZFS_ERR_NONE;
+	}
+
+	err = dmu_read(mdn, blkid, &dnbuf, &endian, data);
+	if (err)
+		return err;
+
+	free(data->dnode_buf);
+	free(data->dnode_mdn);
+	data->dnode_mdn = malloc(sizeof(*mdn));
+	if (!data->dnode_mdn) {
+		data->dnode_buf = 0;
+	} else {
+		memcpy(data->dnode_mdn, mdn, sizeof(*mdn));
+		data->dnode_buf = dnbuf;
+		data->dnode_start = blkid << epbs;
+		data->dnode_end = (blkid + 1) << epbs;
+		data->dnode_endian = endian;
+	}
+
+	memmove(&(buf->dn), (dnode_phys_t *) dnbuf + idx, DNODE_SIZE);
+	buf->endian = endian;
+	if (type && buf->dn.dn_type != type) {
+		printf("incorrect dnode type\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	return ZFS_ERR_NONE;
+}
+
+/*
+ * Get the file dnode for a given file name where mdn is the meta dnode
+ * for this ZFS object set. When found, place the file dnode in dn.
+ * The 'path' argument will be mangled.
+ *
+ */
+static int
+dnode_get_path(dnode_end_t *mdn, const char *path_in, dnode_end_t *dn,
+			   struct grub_zfs_data *data)
+{
+	uint64_t objnum, version;
+	char *cname, ch;
+	int err = ZFS_ERR_NONE;
+	char *path, *path_buf;
+	struct dnode_chain {
+		struct dnode_chain *next;
+		dnode_end_t dn;
+	};
+	struct dnode_chain *dnode_path = 0, *dn_new, *root;
+
+	dn_new = malloc(sizeof(*dn_new));
+	if (!dn_new)
+		return ZFS_ERR_OUT_OF_MEMORY;
+	dn_new->next = 0;
+	dnode_path = root = dn_new;
+
+	err = dnode_get(mdn, MASTER_NODE_OBJ, DMU_OT_MASTER_NODE,
+					&(dnode_path->dn), data);
+	if (err) {
+		free(dn_new);
+		return err;
+	}
+
+	err = zap_lookup(&(dnode_path->dn), ZPL_VERSION_STR, &version, data);
+	if (err) {
+		free(dn_new);
+		return err;
+	}
+	if (version > ZPL_VERSION) {
+		free(dn_new);
+		printf("too new ZPL version\n");
+		return ZFS_ERR_NOT_IMPLEMENTED_YET;
+	}
+
+	err = zap_lookup(&(dnode_path->dn), ZFS_ROOT_OBJ, &objnum, data);
+	if (err) {
+		free(dn_new);
+		return err;
+	}
+
+	err = dnode_get(mdn, objnum, 0, &(dnode_path->dn), data);
+	if (err) {
+		free(dn_new);
+		return err;
+	}
+
+	path = path_buf = strdup(path_in);
+	if (!path_buf) {
+		free(dn_new);
+		return ZFS_ERR_OUT_OF_MEMORY;
+	}
+
+	while (1) {
+		/* skip leading slashes */
+		while (*path == '/')
+			path++;
+		if (!*path)
+			break;
+		/* get the next component name */
+		cname = path;
+		while (*path && *path != '/')
+			path++;
+		/* Skip dot.  */
+		if (cname + 1 == path && cname[0] == '.')
+			continue;
+		/* Handle double dot.  */
+		if (cname + 2 == path && cname[0] == '.' && cname[1] == '.')  {
+			if (dn_new->next) {
+				dn_new = dnode_path;
+				dnode_path = dn_new->next;
+				free(dn_new);
+			} else {
+				printf("can't resolve ..\n");
+				err = ZFS_ERR_FILE_NOT_FOUND;
+				break;
+			}
+			continue;
+		}
+
+		ch = *path;
+		*path = 0;		/* ensure null termination */
+
+		if (dnode_path->dn.dn.dn_type != DMU_OT_DIRECTORY_CONTENTS) {
+			free(path_buf);
+			printf("not a directory\n");
+			return ZFS_ERR_BAD_FILE_TYPE;
+		}
+		err = zap_lookup(&(dnode_path->dn), cname, &objnum, data);
+		if (err)
+			break;
+
+		dn_new = malloc(sizeof(*dn_new));
+		if (!dn_new) {
+			err = ZFS_ERR_OUT_OF_MEMORY;
+			break;
+		}
+		dn_new->next = dnode_path;
+		dnode_path = dn_new;
+
+		objnum = ZFS_DIRENT_OBJ(objnum);
+		err = dnode_get(mdn, objnum, 0, &(dnode_path->dn), data);
+		if (err)
+			break;
+
+		*path = ch;
+	}
+
+	if (!err)
+		memcpy(dn, &(dnode_path->dn), sizeof(*dn));
+
+	while (dnode_path) {
+		dn_new = dnode_path->next;
+		free(dnode_path);
+		dnode_path = dn_new;
+	}
+	free(path_buf);
+	return err;
+}
+
+
+/*
+ * Given a MOS metadnode, get the metadnode of a given filesystem name (fsname),
+ * e.g. pool/rootfs, or a given object number (obj), e.g. the object number
+ * of pool/rootfs.
+ *
+ * If no fsname and no obj are given, return the DSL_DIR metadnode.
+ * If fsname is given, return its metadnode and its matching object number.
+ * If only obj is given, return the metadnode for this object number.
+ *
+ */
+static int
+get_filesystem_dnode(dnode_end_t *mosmdn, char *fsname,
+					 dnode_end_t *mdn, struct grub_zfs_data *data)
+{
+	uint64_t objnum;
+	int err;
+
+	err = dnode_get(mosmdn, DMU_POOL_DIRECTORY_OBJECT,
+					DMU_OT_OBJECT_DIRECTORY, mdn, data);
+	if (err)
+		return err;
+
+	err = zap_lookup(mdn, DMU_POOL_ROOT_DATASET, &objnum, data);
+	if (err)
+		return err;
+
+	err = dnode_get(mosmdn, objnum, DMU_OT_DSL_DIR, mdn, data);
+	if (err)
+		return err;
+
+	while (*fsname) {
+		uint64_t childobj;
+		char *cname, ch;
+
+		while (*fsname == '/')
+			fsname++;
+
+		if (!*fsname || *fsname == '@')
+			break;
+
+		cname = fsname;
+		while (*fsname && !isspace(*fsname) && *fsname != '/')
+			fsname++;
+		ch = *fsname;
+		*fsname = 0;
+
+		childobj = grub_zfs_to_cpu64((((dsl_dir_phys_t *) DN_BONUS(&mdn->dn)))->dd_child_dir_zapobj, mdn->endian);
+		err = dnode_get(mosmdn, childobj,
+						DMU_OT_DSL_DIR_CHILD_MAP, mdn, data);
+		if (err)
+			return err;
+
+		err = zap_lookup(mdn, cname, &objnum, data);
+		if (err)
+			return err;
+
+		err = dnode_get(mosmdn, objnum, DMU_OT_DSL_DIR, mdn, data);
+		if (err)
+			return err;
+
+		*fsname = ch;
+	}
+	return ZFS_ERR_NONE;
+}
+
+static int
+make_mdn(dnode_end_t *mdn, struct grub_zfs_data *data)
+{
+	void *osp;
+	blkptr_t *bp;
+	size_t ospsize;
+	int err;
+
+	bp = &(((dsl_dataset_phys_t *) DN_BONUS(&mdn->dn))->ds_bp);
+	err = zio_read(bp, mdn->endian, &osp, &ospsize, data);
+	if (err)
+		return err;
+	if (ospsize < OBJSET_PHYS_SIZE_V14) {
+		free(osp);
+		printf("too small osp\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	mdn->endian = (grub_zfs_to_cpu64(bp->blk_prop, mdn->endian)>>63) & 1;
+	memmove((char *) &(mdn->dn),
+			(char *) &((objset_phys_t *) osp)->os_meta_dnode, DNODE_SIZE);
+	free(osp);
+	return ZFS_ERR_NONE;
+}
+
+static int
+dnode_get_fullpath(const char *fullpath, dnode_end_t *mdn,
+				   uint64_t *mdnobj, dnode_end_t *dn, int *isfs,
+				   struct grub_zfs_data *data)
+{
+	char *fsname, *snapname;
+	const char *ptr_at, *filename;
+	uint64_t headobj;
+	int err;
+
+	ptr_at = strchr(fullpath, '@');
+	if (!ptr_at) {
+		*isfs = 1;
+		filename = 0;
+		snapname = 0;
+		fsname = strdup(fullpath);
+	} else {
+		const char *ptr_slash = strchr(ptr_at, '/');
+
+		*isfs = 0;
+		fsname = malloc(ptr_at - fullpath + 1);
+		if (!fsname)
+			return ZFS_ERR_OUT_OF_MEMORY;
+		memcpy(fsname, fullpath, ptr_at - fullpath);
+		fsname[ptr_at - fullpath] = 0;
+		if (ptr_at[1] && ptr_at[1] != '/') {
+			snapname = malloc(ptr_slash - ptr_at);
+			if (!snapname) {
+				free(fsname);
+				return ZFS_ERR_OUT_OF_MEMORY;
+			}
+			memcpy(snapname, ptr_at + 1, ptr_slash - ptr_at - 1);
+			snapname[ptr_slash - ptr_at - 1] = 0;
+		} else {
+			snapname = 0;
+		}
+		if (ptr_slash)
+			filename = ptr_slash;
+		else
+			filename = "/";
+		printf("zfs fsname = '%s' snapname='%s' filename = '%s'\n",
+			   fsname, snapname, filename);
+	}
+
+
+	err = get_filesystem_dnode(&(data->mos), fsname, dn, data);
+
+	if (err) {
+		free(fsname);
+		free(snapname);
+		return err;
+	}
+
+	headobj = grub_zfs_to_cpu64(((dsl_dir_phys_t *) DN_BONUS(&dn->dn))->dd_head_dataset_obj, dn->endian);
+
+	err = dnode_get(&(data->mos), headobj, DMU_OT_DSL_DATASET, mdn, data);
+	if (err) {
+		free(fsname);
+		free(snapname);
+		return err;
+	}
+
+	if (snapname) {
+		uint64_t snapobj;
+
+		snapobj = grub_zfs_to_cpu64(((dsl_dataset_phys_t *) DN_BONUS(&mdn->dn))->ds_snapnames_zapobj, mdn->endian);
+
+		err = dnode_get(&(data->mos), snapobj,
+						DMU_OT_DSL_DS_SNAP_MAP, mdn, data);
+		if (!err)
+			err = zap_lookup(mdn, snapname, &headobj, data);
+		if (!err)
+			err = dnode_get(&(data->mos), headobj, DMU_OT_DSL_DATASET, mdn, data);
+		if (err) {
+			free(fsname);
+			free(snapname);
+			return err;
+		}
+	}
+
+	if (mdnobj)
+		*mdnobj = headobj;
+
+	make_mdn(mdn, data);
+
+	if (*isfs) {
+		free(fsname);
+		free(snapname);
+		return ZFS_ERR_NONE;
+	}
+	err = dnode_get_path(mdn, filename, dn, data);
+	free(fsname);
+	free(snapname);
+	return err;
+}
+
+/*
+ * For a given XDR packed nvlist, verify the first 4 bytes and move on.
+ *
+ * An XDR packed nvlist is encoded as (comments from nvs_xdr_create) :
+ *
+ *		encoding method/host endian		(4 bytes)
+ *		nvl_version						(4 bytes)
+ *		nvl_nvflag						(4 bytes)
+ *	encoded nvpairs:
+ *		encoded size of the nvpair		(4 bytes)
+ *		decoded size of the nvpair		(4 bytes)
+ *		name string size				(4 bytes)
+ *		name string data				(sizeof(NV_ALIGN4(string))
+ *		data type						(4 bytes)
+ *		# of elements in the nvpair		(4 bytes)
+ *		data
+ *		2 zero's for the last nvpair
+ *		(end of the entire list)	(8 bytes)
+ *
+ */
+
+static int
+nvlist_find_value(char *nvlist, char *name, int valtype, char **val,
+				  size_t *size_out, size_t *nelm_out)
+{
+	int name_len, type, encode_size;
+	char *nvpair, *nvp_name;
+
+	/* Verify if the 1st and 2nd byte in the nvlist are valid. */
+	/* NOTE: independently of what endianness header announces all
+	   subsequent values are big-endian.  */
+	if (nvlist[0] != NV_ENCODE_XDR || (nvlist[1] != NV_LITTLE_ENDIAN
+									   && nvlist[1] != NV_BIG_ENDIAN)) {
+		printf("zfs incorrect nvlist header\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	/* skip the header, nvl_version, and nvl_nvflag */
+	nvlist = nvlist + 4 * 3;
+	/*
+	 * Loop thru the nvpair list
+	 * The XDR representation of an integer is in big-endian byte order.
+	 */
+	while ((encode_size = grub_be_to_cpu32(*(uint32_t *) nvlist))) {
+		int nelm;
+
+		nvpair = nvlist + 4 * 2;	/* skip the encode/decode size */
+
+		name_len = grub_be_to_cpu32(*(uint32_t *) nvpair);
+		nvpair += 4;
+
+		nvp_name = nvpair;
+		nvpair = nvpair + ((name_len + 3) & ~3);	/* align */
+
+		type = grub_be_to_cpu32(*(uint32_t *) nvpair);
+		nvpair += 4;
+
+		nelm = grub_be_to_cpu32(*(uint32_t *) nvpair);
+		if (nelm < 1) {
+			printf("empty nvpair\n");
+			return ZFS_ERR_BAD_FS;
+		}
+
+		nvpair += 4;
+
+		if ((strncmp(nvp_name, name, name_len) == 0) && type == valtype) {
+			*val = nvpair;
+			*size_out = encode_size;
+			if (nelm_out)
+				*nelm_out = nelm;
+			return 1;
+		}
+
+		nvlist += encode_size;	/* goto the next nvpair */
+	}
+	return 0;
+}
+
+int
+grub_zfs_nvlist_lookup_uint64(char *nvlist, char *name, uint64_t *out)
+{
+	char *nvpair;
+	size_t size;
+	int found;
+
+	found = nvlist_find_value(nvlist, name, DATA_TYPE_UINT64, &nvpair, &size, 0);
+	if (!found)
+		return 0;
+	if (size < sizeof(uint64_t)) {
+		printf("invalid uint64\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	*out = grub_be_to_cpu64(*(uint64_t *) nvpair);
+	return 1;
+}
+
+char *
+grub_zfs_nvlist_lookup_string(char *nvlist, char *name)
+{
+	char *nvpair;
+	char *ret;
+	size_t slen;
+	size_t size;
+	int found;
+
+	found = nvlist_find_value(nvlist, name, DATA_TYPE_STRING, &nvpair, &size, 0);
+	if (!found)
+		return 0;
+	if (size < 4) {
+		printf("invalid string\n");
+		return 0;
+	}
+	slen = grub_be_to_cpu32(*(uint32_t *) nvpair);
+	if (slen > size - 4)
+		slen = size - 4;
+	ret = malloc(slen + 1);
+	if (!ret)
+		return 0;
+	memcpy(ret, nvpair + 4, slen);
+	ret[slen] = 0;
+	return ret;
+}
+
+char *
+grub_zfs_nvlist_lookup_nvlist(char *nvlist, char *name)
+{
+	char *nvpair;
+	char *ret;
+	size_t size;
+	int found;
+
+	found = nvlist_find_value(nvlist, name, DATA_TYPE_NVLIST, &nvpair,
+							  &size, 0);
+	if (!found)
+		return 0;
+	ret = calloc(1, size + 3 * sizeof(uint32_t));
+	if (!ret)
+		return 0;
+	memcpy(ret, nvlist, sizeof(uint32_t));
+
+	memcpy(ret + sizeof(uint32_t), nvpair, size);
+	return ret;
+}
+
+int
+grub_zfs_nvlist_lookup_nvlist_array_get_nelm(char *nvlist, char *name)
+{
+	char *nvpair;
+	size_t nelm, size;
+	int found;
+
+	found = nvlist_find_value(nvlist, name, DATA_TYPE_NVLIST, &nvpair,
+							  &size, &nelm);
+	if (!found)
+		return -1;
+	return nelm;
+}
+
+char *
+grub_zfs_nvlist_lookup_nvlist_array(char *nvlist, char *name,
+									size_t index)
+{
+	char *nvpair, *nvpairptr;
+	int found;
+	char *ret;
+	size_t size;
+	unsigned i;
+	size_t nelm;
+
+	found = nvlist_find_value(nvlist, name, DATA_TYPE_NVLIST, &nvpair,
+							  &size, &nelm);
+	if (!found)
+		return 0;
+	if (index >= nelm) {
+		printf("trying to lookup past nvlist array\n");
+		return 0;
+	}
+
+	nvpairptr = nvpair;
+
+	for (i = 0; i < index; i++) {
+		uint32_t encode_size;
+
+		/* skip the header, nvl_version, and nvl_nvflag */
+		nvpairptr = nvpairptr + 4 * 2;
+
+		while (nvpairptr < nvpair + size
+			   && (encode_size = grub_be_to_cpu32(*(uint32_t *) nvpairptr)))
+			nvlist += encode_size;	/* goto the next nvpair */
+
+		nvlist = nvlist + 4 * 2;	/* skip the ending 2 zeros - 8 bytes */
+	}
+
+	if (nvpairptr >= nvpair + size
+		|| nvpairptr + grub_be_to_cpu32(*(uint32_t *) (nvpairptr + 4 * 2))
+		>= nvpair + size) {
+		printf("incorrect nvlist array\n");
+		return 0;
+	}
+
+	ret = calloc(1, grub_be_to_cpu32(*(uint32_t *) (nvpairptr + 4 * 2))
+				 + 3 * sizeof(uint32_t));
+	if (!ret)
+		return 0;
+	memcpy(ret, nvlist, sizeof(uint32_t));
+
+	memcpy(ret + sizeof(uint32_t), nvpairptr, size);
+	return ret;
+}
+
+static int
+zfs_fetch_nvlist(struct grub_zfs_data *data, char **nvlist)
+{
+	int err;
+
+	*nvlist = malloc(VDEV_PHYS_SIZE);
+	/* Read in the vdev name-value pair list (112K). */
+	err = zfs_devread(data->vdev_phys_sector, 0, VDEV_PHYS_SIZE, *nvlist);
+	if (err) {
+		free(*nvlist);
+		*nvlist = 0;
+		return err;
+	}
+	return ZFS_ERR_NONE;
+}
+
+/*
+ * Check the disk label information and retrieve needed vdev name-value pairs.
+ *
+ */
+static int
+check_pool_label(struct grub_zfs_data *data)
+{
+	uint64_t pool_state;
+	char *nvlist;			/* for the pool */
+	char *vdevnvlist;		/* for the vdev */
+	uint64_t diskguid;
+	uint64_t version;
+	int found;
+	int err;
+
+	err = zfs_fetch_nvlist(data, &nvlist);
+	if (err)
+		return err;
+
+	found = grub_zfs_nvlist_lookup_uint64(nvlist, ZPOOL_CONFIG_POOL_STATE,
+										  &pool_state);
+	if (!found) {
+		free(nvlist);
+		printf("zfs pool state not found\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	if (pool_state == POOL_STATE_DESTROYED) {
+		free(nvlist);
+		printf("zpool is marked as destroyed\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	data->label_txg = 0;
+	found = grub_zfs_nvlist_lookup_uint64(nvlist, ZPOOL_CONFIG_POOL_TXG,
+										  &data->label_txg);
+	if (!found) {
+		free(nvlist);
+		printf("zfs pool txg not found\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	/* not an active device */
+	if (data->label_txg == 0) {
+		free(nvlist);
+		printf("zpool is not active\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	found = grub_zfs_nvlist_lookup_uint64(nvlist, ZPOOL_CONFIG_VERSION,
+										  &version);
+	if (!found) {
+		free(nvlist);
+		printf("zpool config version not found\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	if (version > SPA_VERSION) {
+		free(nvlist);
+		printf("SPA version too new %llu > %llu\n",
+			   (unsigned long long) version,
+			   (unsigned long long) SPA_VERSION);
+		return ZFS_ERR_NOT_IMPLEMENTED_YET;
+	}
+
+	vdevnvlist = grub_zfs_nvlist_lookup_nvlist(nvlist, ZPOOL_CONFIG_VDEV_TREE);
+	if (!vdevnvlist) {
+		free(nvlist);
+		printf("ZFS config vdev tree not found\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	found = grub_zfs_nvlist_lookup_uint64(vdevnvlist, ZPOOL_CONFIG_ASHIFT,
+										  &data->vdev_ashift);
+	free(vdevnvlist);
+	if (!found) {
+		free(nvlist);
+		printf("ZPOOL config ashift not found\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	found = grub_zfs_nvlist_lookup_uint64(nvlist, ZPOOL_CONFIG_GUID, &diskguid);
+	if (!found) {
+		free(nvlist);
+		printf("ZPOOL config guid not found\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	found = grub_zfs_nvlist_lookup_uint64(nvlist, ZPOOL_CONFIG_POOL_GUID, &data->pool_guid);
+	if (!found) {
+		free(nvlist);
+		printf("ZPOOL config pool guid not found\n");
+		return ZFS_ERR_BAD_FS;
+	}
+
+	free(nvlist);
+
+	printf("ZFS Pool GUID: %llu (%016llx) Label: GUID: %llu (%016llx), txg: %llu, SPA v%llu, ashift: %llu\n",
+		   (unsigned long long) data->pool_guid,
+		   (unsigned long long) data->pool_guid,
+		   (unsigned long long) diskguid,
+		   (unsigned long long) diskguid,
+		   (unsigned long long) data->label_txg,
+		   (unsigned long long) version,
+		   (unsigned long long) data->vdev_ashift);
+
+	return ZFS_ERR_NONE;
+}
+
+/*
+ * vdev_label_start returns the physical disk offset (in bytes) of
+ * label "l".
+ */
+static uint64_t vdev_label_start(uint64_t psize, int l)
+{
+	return (l * sizeof(vdev_label_t) + (l < VDEV_LABELS / 2 ?
+										0 : psize -
+										VDEV_LABELS * sizeof(vdev_label_t)));
+}
+
+void
+zfs_unmount(struct grub_zfs_data *data)
+{
+	free(data->dnode_buf);
+	free(data->dnode_mdn);
+	free(data->file_buf);
+	free(data);
+}
+
+/*
+ * zfs_mount() locates a valid uberblock of the root pool and read in its MOS
+ * to the memory address MOS.
+ *
+ */
+struct grub_zfs_data *
+zfs_mount(device_t dev)
+{
+	struct grub_zfs_data *data = 0;
+	int label = 0, bestlabel = -1;
+	char *ub_array;
+	uberblock_t *ubbest;
+	uberblock_t *ubcur = NULL;
+	void *osp = 0;
+	size_t ospsize;
+	int err;
+
+	data = malloc(sizeof(*data));
+	if (!data)
+		return 0;
+	memset(data, 0, sizeof(*data));
+
+	ub_array = malloc(VDEV_UBERBLOCK_RING);
+	if (!ub_array) {
+		zfs_unmount(data);
+		return 0;
+	}
+
+	ubbest = malloc(sizeof(*ubbest));
+	if (!ubbest) {
+		zfs_unmount(data);
+		return 0;
+	}
+	memset(ubbest, 0, sizeof(*ubbest));
+
+	/*
+	 * some eltorito stacks don't give us a size and
+	 * we end up setting the size to MAXUINT, further
+	 * some of these devices stop working once a single
+	 * read past the end has been issued. Checking
+	 * for a maximum part_length and skipping the backup
+	 * labels at the end of the slice/partition/device
+	 * avoids breaking down on such devices.
+	 */
+	const int vdevnum =
+		dev->part_length == 0 ?
+		VDEV_LABELS / 2 : VDEV_LABELS;
+
+	/* Size in bytes of the device (disk or partition) aligned to label size*/
+	uint64_t device_size =
+		dev->part_length << SECTOR_BITS;
+
+	const uint64_t alignedbytes =
+		P2ALIGN(device_size, (uint64_t) sizeof(vdev_label_t));
+
+	for (label = 0; label < vdevnum; label++) {
+		uint64_t labelstartbytes = vdev_label_start(alignedbytes, label);
+		uint64_t labelstart = labelstartbytes >> SECTOR_BITS;
+
+		debug("zfs reading label %d at sector %llu (byte %llu)\n",
+			  label, (unsigned long long) labelstart,
+			  (unsigned long long) labelstartbytes);
+
+		data->vdev_phys_sector = labelstart +
+			((VDEV_SKIP_SIZE + VDEV_BOOT_HEADER_SIZE) >> SECTOR_BITS);
+
+		err = check_pool_label(data);
+		if (err) {
+			printf("zfs error checking label %d\n", label);
+			continue;
+		}
+
+		/* Read in the uberblock ring (128K). */
+		err = zfs_devread(data->vdev_phys_sector  +
+						  (VDEV_PHYS_SIZE >> SECTOR_BITS),
+						  0, VDEV_UBERBLOCK_RING, ub_array);
+		if (err) {
+			printf("zfs error reading uberblock ring for label %d\n", label);
+			continue;
+		}
+
+		ubcur = find_bestub(ub_array, data);
+		if (!ubcur) {
+			printf("zfs No good uberblocks found in label %d\n", label);
+			continue;
+		}
+
+		if (vdev_uberblock_compare(ubcur, ubbest) > 0) {
+			/* Looks like the block is good, so use it.*/
+			memcpy(ubbest, ubcur, sizeof(*ubbest));
+			bestlabel = label;
+			debug("zfs Current best uberblock found in label %d\n", label);
+		}
+	}
+	free(ub_array);
+
+	/* We zero'd the structure to begin with.  If we never assigned to it,
+	   magic will still be zero. */
+	if (!ubbest->ub_magic) {
+		printf("couldn't find a valid ZFS label\n");
+		zfs_unmount(data);
+		free(ubbest);
+		return 0;
+	}
+
+	debug("zfs ubbest %p in label %d\n", ubbest, bestlabel);
+
+	grub_zfs_endian_t ub_endian =
+		grub_zfs_to_cpu64(ubbest->ub_magic, LITTLE_ENDIAN) == UBERBLOCK_MAGIC
+		? LITTLE_ENDIAN : BIG_ENDIAN;
+
+	debug("zfs endian set to %s\n", !ub_endian ? "big" : "little");
+
+	err = zio_read(&ubbest->ub_rootbp, ub_endian, &osp, &ospsize, data);
+
+	if (err) {
+		printf("couldn't zio_read object directory\n");
+		zfs_unmount(data);
+		free(ubbest);
+		return 0;
+	}
+
+	if (ospsize < OBJSET_PHYS_SIZE_V14) {
+		printf("osp too small\n");
+		zfs_unmount(data);
+		free(osp);
+		free(ubbest);
+		return 0;
+	}
+
+	/* Got the MOS. Save it at the memory addr MOS. */
+	memmove(&(data->mos.dn), &((objset_phys_t *) osp)->os_meta_dnode, DNODE_SIZE);
+	data->mos.endian =
+		(grub_zfs_to_cpu64(ubbest->ub_rootbp.blk_prop, ub_endian) >> 63) & 1;
+	memmove(&(data->current_uberblock), ubbest, sizeof(uberblock_t));
+
+	free(osp);
+	free(ubbest);
+
+	return data;
+}
+
+int
+grub_zfs_fetch_nvlist(device_t dev, char **nvlist)
+{
+	struct grub_zfs_data *zfs;
+	int err;
+
+	zfs = zfs_mount(dev);
+	if (!zfs)
+		return ZFS_ERR_BAD_FS;
+	err = zfs_fetch_nvlist(zfs, nvlist);
+	zfs_unmount(zfs);
+	return err;
+}
+
+static int
+zfs_label(device_t device, char **label)
+{
+	char *nvlist;
+	int err;
+	struct grub_zfs_data *data;
+
+	data = zfs_mount(device);
+	if (!data)
+		return ZFS_ERR_BAD_FS;
+
+	err = zfs_fetch_nvlist(data, &nvlist);
+	if (err) {
+		zfs_unmount(data);
+		return err;
+	}
+
+	*label = grub_zfs_nvlist_lookup_string(nvlist, ZPOOL_CONFIG_POOL_NAME);
+	free(nvlist);
+	zfs_unmount(data);
+	return ZFS_ERR_NONE;
+}
+
+static int
+zfs_uuid(device_t device, char **uuid)
+{
+	struct grub_zfs_data *data;
+
+	data = zfs_mount(device);
+	if (!data)
+		return ZFS_ERR_BAD_FS;
+
+	*uuid = malloc(17); /* %016llx + nil */
+	if (!*uuid)
+		return ZFS_ERR_OUT_OF_MEMORY;
+
+	/* *uuid = xasprintf ("%016llx", (long long unsigned) data->pool_guid);*/
+	snprintf(*uuid, 17, "%016llx", (long long unsigned) data->pool_guid);
+	zfs_unmount(data);
+
+	return ZFS_ERR_NONE;
+}
+
+/*
+ * zfs_open() locates a file in the rootpool by following the
+ * MOS and places the dnode of the file in the memory address DNODE.
+ */
+int
+zfs_open(struct zfs_file *file, const char *fsfilename)
+{
+	struct grub_zfs_data *data;
+	int err;
+	int isfs;
+
+	data = zfs_mount(file->device);
+	if (!data)
+		return ZFS_ERR_BAD_FS;
+
+	err = dnode_get_fullpath(fsfilename, &(data->mdn), 0,
+							 &(data->dnode), &isfs, data);
+	if (err) {
+		zfs_unmount(data);
+		return err;
+	}
+
+	if (isfs) {
+		zfs_unmount(data);
+		printf("Missing @ or / separator\n");
+		return ZFS_ERR_FILE_NOT_FOUND;
+	}
+
+	/* We found the dnode for this file. Verify if it is a plain file. */
+	if (data->dnode.dn.dn_type != DMU_OT_PLAIN_FILE_CONTENTS) {
+		zfs_unmount(data);
+		printf("not a file\n");
+		return ZFS_ERR_BAD_FILE_TYPE;
+	}
+
+	/* get the file size and set the file position to 0 */
+
+	/*
+	 * For DMU_OT_SA we will need to locate the SIZE attribute
+	 * attribute, which could be either in the bonus buffer
+	 * or the "spill" block.
+	 */
+	if (data->dnode.dn.dn_bonustype == DMU_OT_SA) {
+		void *sahdrp;
+		int hdrsize;
+
+		if (data->dnode.dn.dn_bonuslen != 0) {
+			sahdrp = (sa_hdr_phys_t *) DN_BONUS(&data->dnode.dn);
+		} else if (data->dnode.dn.dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
+			blkptr_t *bp = &data->dnode.dn.dn_spill;
+
+			err = zio_read(bp, data->dnode.endian, &sahdrp, NULL, data);
+			if (err)
+				return err;
+		} else {
+			printf("filesystem is corrupt :(\n");
+			return ZFS_ERR_BAD_FS;
+		}
+
+		hdrsize = SA_HDR_SIZE(((sa_hdr_phys_t *) sahdrp));
+		file->size = *(uint64_t *) ((char *) sahdrp + hdrsize + SA_SIZE_OFFSET);
+	} else {
+		file->size = grub_zfs_to_cpu64(((znode_phys_t *) DN_BONUS(&data->dnode.dn))->zp_size, data->dnode.endian);
+	}
+
+	file->data = data;
+	file->offset = 0;
+
+	return ZFS_ERR_NONE;
+}
+
+uint64_t
+zfs_read(zfs_file_t file, char *buf, uint64_t len)
+{
+	struct grub_zfs_data *data = (struct grub_zfs_data *) file->data;
+	int blksz, movesize;
+	uint64_t length;
+	int64_t red;
+	int err;
+
+	if (data->file_buf == NULL) {
+		data->file_buf = malloc(SPA_MAXBLOCKSIZE);
+		if (!data->file_buf)
+			return -1;
+		data->file_start = data->file_end = 0;
+	}
+
+	/*
+	 * If offset is in memory, move it into the buffer provided and return.
+	 */
+	if (file->offset >= data->file_start
+		&& file->offset + len <= data->file_end) {
+		memmove(buf, data->file_buf + file->offset - data->file_start,
+				len);
+		return len;
+	}
+
+	blksz = grub_zfs_to_cpu16(data->dnode.dn.dn_datablkszsec,
+							  data->dnode.endian) << SPA_MINBLOCKSHIFT;
+
+	/*
+	 * Entire Dnode is too big to fit into the space available.	 We
+	 * will need to read it in chunks.	This could be optimized to
+	 * read in as large a chunk as there is space available, but for
+	 * now, this only reads in one data block at a time.
+	 */
+	length = len;
+	red = 0;
+	while (length) {
+		void *t;
+		/*
+		 * Find requested blkid and the offset within that block.
+		 */
+		uint64_t blkid = (file->offset + red) /	 blksz;
+		free(data->file_buf);
+		data->file_buf = 0;
+
+		err = dmu_read(&(data->dnode), blkid, &t,
+					   0, data);
+		data->file_buf = t;
+		if (err)
+			return -1;
+
+		data->file_start = blkid * blksz;
+		data->file_end = data->file_start + blksz;
+
+		movesize = MIN(length, data->file_end - (int) file->offset - red);
+
+		memmove(buf, data->file_buf + file->offset + red
+				- data->file_start, movesize);
+		buf += movesize;
+		length -= movesize;
+		red += movesize;
+	}
+
+	return len;
+}
+
+int
+zfs_close(zfs_file_t file)
+{
+	zfs_unmount((struct grub_zfs_data *) file->data);
+	return ZFS_ERR_NONE;
+}
+
+int
+grub_zfs_getmdnobj(device_t dev, const char *fsfilename,
+				   uint64_t *mdnobj)
+{
+	struct grub_zfs_data *data;
+	int err;
+	int isfs;
+
+	data = zfs_mount(dev);
+	if (!data)
+		return ZFS_ERR_BAD_FS;
+
+	err = dnode_get_fullpath(fsfilename, &(data->mdn), mdnobj,
+							 &(data->dnode), &isfs, data);
+	zfs_unmount(data);
+	return err;
+}
+
+static void
+fill_fs_info(struct zfs_dirhook_info *info,
+			 dnode_end_t mdn, struct grub_zfs_data *data)
+{
+	int err;
+	dnode_end_t dn;
+	uint64_t objnum;
+	uint64_t headobj;
+
+	memset(info, 0, sizeof(*info));
+
+	info->dir = 1;
+
+	if (mdn.dn.dn_type == DMU_OT_DSL_DIR) {
+		headobj = grub_zfs_to_cpu64(((dsl_dir_phys_t *) DN_BONUS(&mdn.dn))->dd_head_dataset_obj, mdn.endian);
+
+		err = dnode_get(&(data->mos), headobj, DMU_OT_DSL_DATASET, &mdn, data);
+		if (err) {
+			printf("zfs failed here 1\n");
+			return;
+		}
+	}
+	make_mdn(&mdn, data);
+	err = dnode_get(&mdn, MASTER_NODE_OBJ, DMU_OT_MASTER_NODE,
+					&dn, data);
+	if (err) {
+		printf("zfs failed here 2\n");
+		return;
+	}
+
+	err = zap_lookup(&dn, ZFS_ROOT_OBJ, &objnum, data);
+	if (err) {
+		printf("zfs failed here 3\n");
+		return;
+	}
+
+	err = dnode_get(&mdn, objnum, 0, &dn, data);
+	if (err) {
+		printf("zfs failed here 4\n");
+		return;
+	}
+
+	info->mtimeset = 1;
+	info->mtime = grub_zfs_to_cpu64(((znode_phys_t *) DN_BONUS(&dn.dn))->zp_mtime[0], dn.endian);
+
+	return;
+}
+
+static int iterate_zap(const char *name, uint64_t val, struct grub_zfs_data *data)
+{
+	struct zfs_dirhook_info info;
+	dnode_end_t dn;
+
+	memset(&info, 0, sizeof(info));
+
+	dnode_get(&(data->mdn), val, 0, &dn, data);
+	info.mtimeset = 1;
+	info.mtime = grub_zfs_to_cpu64(((znode_phys_t *) DN_BONUS(&dn.dn))->zp_mtime[0], dn.endian);
+	info.dir = (dn.dn.dn_type == DMU_OT_DIRECTORY_CONTENTS);
+	debug("zfs type=%d, name=%s\n",
+		  (int)dn.dn.dn_type, (char *)name);
+	if (!data->userhook)
+		return 0;
+	return data->userhook(name, &info);
+}
+
+static int iterate_zap_fs(const char *name, uint64_t val, struct grub_zfs_data *data)
+{
+	struct zfs_dirhook_info info;
+	dnode_end_t mdn;
+	int err;
+	err = dnode_get(&(data->mos), val, 0, &mdn, data);
+	if (err)
+		return 0;
+	if (mdn.dn.dn_type != DMU_OT_DSL_DIR)
+		return 0;
+
+	fill_fs_info(&info, mdn, data);
+
+	if (!data->userhook)
+		return 0;
+	return data->userhook(name, &info);
+}
+
+static int iterate_zap_snap(const char *name, uint64_t val, struct grub_zfs_data *data)
+{
+	struct zfs_dirhook_info info;
+	char *name2;
+	int ret = 0;
+	dnode_end_t mdn;
+	int err;
+
+	err = dnode_get(&(data->mos), val, 0, &mdn, data);
+	if (err)
+		return 0;
+
+	if (mdn.dn.dn_type != DMU_OT_DSL_DATASET)
+		return 0;
+
+	fill_fs_info(&info, mdn, data);
+
+	name2 = malloc(strlen(name) + 2);
+	name2[0] = '@';
+	memcpy(name2 + 1, name, strlen(name) + 1);
+	if (data->userhook)
+		ret = data->userhook(name2, &info);
+	free(name2);
+	return ret;
+}
+
+int
+zfs_ls(device_t device, const char *path,
+	   int (*hook)(const char *, const struct zfs_dirhook_info *))
+{
+	struct grub_zfs_data *data;
+	int err;
+	int isfs;
+#if 0
+	char *label = NULL;
+
+	zfs_label(device, &label);
+	if (label)
+		printf("ZPOOL label '%s'\n",
+			   label);
+#endif
+
+	data = zfs_mount(device);
+	if (!data)
+		return ZFS_ERR_BAD_FS;
+
+	data->userhook = hook;
+
+	err = dnode_get_fullpath(path, &(data->mdn), 0, &(data->dnode), &isfs, data);
+	if (err) {
+		zfs_unmount(data);
+		return err;
+	}
+	if (isfs) {
+		uint64_t childobj, headobj;
+		uint64_t snapobj;
+		dnode_end_t dn;
+		struct zfs_dirhook_info info;
+
+		fill_fs_info(&info, data->dnode, data);
+		hook("@", &info);
+
+		childobj = grub_zfs_to_cpu64(((dsl_dir_phys_t *) DN_BONUS(&data->dnode.dn))->dd_child_dir_zapobj, data->dnode.endian);
+		headobj = grub_zfs_to_cpu64(((dsl_dir_phys_t *) DN_BONUS(&data->dnode.dn))->dd_head_dataset_obj, data->dnode.endian);
+		err = dnode_get(&(data->mos), childobj,
+						DMU_OT_DSL_DIR_CHILD_MAP, &dn, data);
+		if (err) {
+			zfs_unmount(data);
+			return err;
+		}
+
+
+		zap_iterate(&dn, iterate_zap_fs, data);
+
+		err = dnode_get(&(data->mos), headobj, DMU_OT_DSL_DATASET, &dn, data);
+		if (err) {
+			zfs_unmount(data);
+			return err;
+		}
+
+		snapobj = grub_zfs_to_cpu64(((dsl_dataset_phys_t *) DN_BONUS(&dn.dn))->ds_snapnames_zapobj, dn.endian);
+
+		err = dnode_get(&(data->mos), snapobj,
+						DMU_OT_DSL_DS_SNAP_MAP, &dn, data);
+		if (err) {
+			zfs_unmount(data);
+			return err;
+		}
+
+		zap_iterate(&dn, iterate_zap_snap, data);
+	} else {
+		if (data->dnode.dn.dn_type != DMU_OT_DIRECTORY_CONTENTS) {
+			zfs_unmount(data);
+			printf("not a directory\n");
+			return ZFS_ERR_BAD_FILE_TYPE;
+		}
+		zap_iterate(&(data->dnode), iterate_zap, data);
+	}
+	zfs_unmount(data);
+	return ZFS_ERR_NONE;
+}
+
diff --git a/fs/zfs/zfs_fletcher.c b/fs/zfs/zfs_fletcher.c
new file mode 100644
index 0000000..d96c6ff
--- /dev/null
+++ b/fs/zfs/zfs_fletcher.c
@@ -0,0 +1,84 @@
+/*
+ *	GRUB  --  GRand Unified Bootloader
+ *	Copyright (C) 1999,2000,2001,2002,2003,2004,2009
+ *	Free Software Foundation, Inc.
+ *	Copyright 2007 Sun Microsystems, Inc.
+ *
+ *	GRUB 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 3 of the License, or
+ *	(at your option) any later version.
+ *
+ *	GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+#include <linux/ctype.h>
+#include <asm/byteorder.h>
+#include "zfs_common.h"
+
+#include <zfs/zfs.h>
+#include <zfs/zio.h>
+#include <zfs/dnode.h>
+#include <zfs/uberblock_impl.h>
+#include <zfs/vdev_impl.h>
+#include <zfs/zio_checksum.h>
+#include <zfs/zap_impl.h>
+#include <zfs/zap_leaf.h>
+#include <zfs/zfs_znode.h>
+#include <zfs/dmu.h>
+#include <zfs/dmu_objset.h>
+#include <zfs/dsl_dir.h>
+#include <zfs/dsl_dataset.h>
+
+void
+fletcher_2(const void *buf, uint64_t size, grub_zfs_endian_t endian,
+		   zio_cksum_t *zcp)
+{
+	const uint64_t *ip = buf;
+	const uint64_t *ipend = ip + (size / sizeof(uint64_t));
+	uint64_t a0, b0, a1, b1;
+
+	for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
+		a0 += grub_zfs_to_cpu64(ip[0], endian);
+		a1 += grub_zfs_to_cpu64(ip[1], endian);
+		b0 += a0;
+		b1 += a1;
+	}
+
+	zcp->zc_word[0] = grub_cpu_to_zfs64(a0, endian);
+	zcp->zc_word[1] = grub_cpu_to_zfs64(a1, endian);
+	zcp->zc_word[2] = grub_cpu_to_zfs64(b0, endian);
+	zcp->zc_word[3] = grub_cpu_to_zfs64(b1, endian);
+}
+
+void
+fletcher_4(const void *buf, uint64_t size, grub_zfs_endian_t endian,
+		   zio_cksum_t *zcp)
+{
+	const uint32_t *ip = buf;
+	const uint32_t *ipend = ip + (size / sizeof(uint32_t));
+	uint64_t a, b, c, d;
+
+	for (a = b = c = d = 0; ip < ipend; ip++) {
+		a += grub_zfs_to_cpu32(ip[0], endian);
+		b += a;
+		c += b;
+		d += c;
+	}
+
+	zcp->zc_word[0] = grub_cpu_to_zfs64(a, endian);
+	zcp->zc_word[1] = grub_cpu_to_zfs64(b, endian);
+	zcp->zc_word[2] = grub_cpu_to_zfs64(c, endian);
+	zcp->zc_word[3] = grub_cpu_to_zfs64(d, endian);
+}
+
diff --git a/fs/zfs/zfs_lzjb.c b/fs/zfs/zfs_lzjb.c
new file mode 100644
index 0000000..33e9b90
--- /dev/null
+++ b/fs/zfs/zfs_lzjb.c
@@ -0,0 +1,94 @@
+/*
+ *	GRUB  --  GRand Unified Bootloader
+ *	Copyright (C) 1999,2000,2001,2002,2003,2004,2009
+ *	Free Software Foundation, Inc.
+ *	Copyright 2007 Sun Microsystems, Inc.
+ *
+ *	GRUB 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 3 of the License, or
+ *	(at your option) any later version.
+ *
+ *	GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+#include <linux/ctype.h>
+#include <asm/byteorder.h>
+#include "zfs_common.h"
+
+#include <zfs/zfs.h>
+#include <zfs/zio.h>
+#include <zfs/dnode.h>
+#include <zfs/uberblock_impl.h>
+#include <zfs/vdev_impl.h>
+#include <zfs/zio_checksum.h>
+#include <zfs/zap_impl.h>
+#include <zfs/zap_leaf.h>
+#include <zfs/zfs_znode.h>
+#include <zfs/dmu.h>
+#include <zfs/dmu_objset.h>
+#include <zfs/dsl_dir.h>
+#include <zfs/dsl_dataset.h>
+
+#define	MATCH_BITS	6
+#define	MATCH_MIN	3
+#define	OFFSET_MASK	((1 << (16 - MATCH_BITS)) - 1)
+
+/*
+ * Decompression Entry - lzjb
+ */
+#ifndef	NBBY
+#define	NBBY	8
+#endif
+
+int
+lzjb_decompress(void *s_start, void *d_start, uint32_t s_len,
+				uint32_t d_len)
+{
+	uint8_t *src = s_start;
+	uint8_t *dst = d_start;
+	uint8_t *d_end = (uint8_t *) d_start + d_len;
+	uint8_t *s_end = (uint8_t *) s_start + s_len;
+	uint8_t *cpy, copymap = 0;
+	int copymask = 1 << (NBBY - 1);
+
+	while (dst < d_end && src < s_end) {
+		if ((copymask <<= 1) == (1 << NBBY)) {
+			copymask = 1;
+			copymap = *src++;
+		}
+		if (src >= s_end) {
+			printf("lzjb decompression failed\n");
+			return ZFS_ERR_BAD_FS;
+		}
+		if (copymap & copymask) {
+			int mlen = (src[0] >> (NBBY - MATCH_BITS)) + MATCH_MIN;
+			int offset = ((src[0] << NBBY) | src[1]) & OFFSET_MASK;
+			src += 2;
+			cpy = dst - offset;
+			if (src > s_end || cpy < (uint8_t *) d_start) {
+				printf("lzjb decompression failed\n");
+				return ZFS_ERR_BAD_FS;
+			}
+			while (--mlen >= 0 && dst < d_end)
+				*dst++ = *cpy++;
+		} else {
+			*dst++ = *src++;
+		}
+	}
+	if (dst < d_end) {
+		printf("lzjb decompression failed\n");
+		return ZFS_ERR_BAD_FS;
+	}
+	return ZFS_ERR_NONE;
+}
diff --git a/fs/zfs/zfs_sha256.c b/fs/zfs/zfs_sha256.c
new file mode 100644
index 0000000..7a9439a
--- /dev/null
+++ b/fs/zfs/zfs_sha256.c
@@ -0,0 +1,145 @@
+/*
+ *	GRUB  --  GRand Unified Bootloader
+ *	Copyright (C) 1999,2000,2001,2002,2003,2004,2009
+ *	Free Software Foundation, Inc.
+ *	Copyright 2007 Sun Microsystems, Inc.
+ *
+ *	GRUB 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 3 of the License, or
+ *	(at your option) any later version.
+ *
+ *	GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+#include <linux/ctype.h>
+#include <asm/byteorder.h>
+#include "zfs_common.h"
+
+#include <zfs/zfs.h>
+#include <zfs/zio.h>
+#include <zfs/dnode.h>
+#include <zfs/uberblock_impl.h>
+#include <zfs/vdev_impl.h>
+#include <zfs/zio_checksum.h>
+#include <zfs/zap_impl.h>
+#include <zfs/zap_leaf.h>
+#include <zfs/zfs_znode.h>
+#include <zfs/dmu.h>
+#include <zfs/dmu_objset.h>
+#include <zfs/dsl_dir.h>
+#include <zfs/dsl_dataset.h>
+
+/*
+ * SHA-256 checksum, as specified in FIPS 180-2, available at:
+ * http://csrc.nist.gov/cryptval
+ *
+ * This is a very compact implementation of SHA-256.
+ * It is designed to be simple and portable, not to be fast.
+ */
+
+/*
+ * The literal definitions according to FIPS180-2 would be:
+ *
+ *	Ch(x, y, z)		(((x) & (y)) ^ ((~(x)) & (z)))
+ *	Maj(x, y, z)	(((x) & (y)) | ((x) & (z)) | ((y) & (z)))
+ *
+ * We use logical equivalents which require one less op.
+ */
+#define	Ch(x, y, z)	((z) ^ ((x) & ((y) ^ (z))))
+#define	Maj(x, y, z)	(((x) & (y)) ^ ((z) & ((x) ^ (y))))
+#define	Rot32(x, s)	(((x) >> s) | ((x) << (32 - s)))
+#define	SIGMA0(x)	(Rot32(x, 2) ^ Rot32(x, 13) ^ Rot32(x, 22))
+#define	SIGMA1(x)	(Rot32(x, 6) ^ Rot32(x, 11) ^ Rot32(x, 25))
+#define	sigma0(x)	(Rot32(x, 7) ^ Rot32(x, 18) ^ ((x) >> 3))
+#define	sigma1(x)	(Rot32(x, 17) ^ Rot32(x, 19) ^ ((x) >> 10))
+
+static const uint32_t SHA256_K[64] = {
+	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
+	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
+	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
+	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
+	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+};
+
+static void
+SHA256Transform(uint32_t *H, const uint8_t *cp)
+{
+	uint32_t a, b, c, d, e, f, g, h, t, T1, T2, W[64];
+
+	for (t = 0; t < 16; t++, cp += 4)
+		W[t] = (cp[0] << 24) | (cp[1] << 16) | (cp[2] << 8) | cp[3];
+
+	for (t = 16; t < 64; t++)
+		W[t] = sigma1(W[t - 2]) + W[t - 7] +
+			sigma0(W[t - 15]) + W[t - 16];
+
+	a = H[0]; b = H[1]; c = H[2]; d = H[3];
+	e = H[4]; f = H[5]; g = H[6]; h = H[7];
+
+	for (t = 0; t < 64; t++) {
+		T1 = h + SIGMA1(e) + Ch(e, f, g) + SHA256_K[t] + W[t];
+		T2 = SIGMA0(a) + Maj(a, b, c);
+		h = g; g = f; f = e; e = d + T1;
+		d = c; c = b; b = a; a = T1 + T2;
+	}
+
+	H[0] += a; H[1] += b; H[2] += c; H[3] += d;
+	H[4] += e; H[5] += f; H[6] += g; H[7] += h;
+}
+
+void
+zio_checksum_SHA256(const void *buf, uint64_t size,
+					grub_zfs_endian_t endian, zio_cksum_t *zcp)
+{
+	uint32_t H[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
+					  0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
+	uint8_t pad[128];
+	unsigned padsize = size & 63;
+	unsigned i;
+
+	for (i = 0; i < size - padsize; i += 64)
+		SHA256Transform(H, (uint8_t *)buf + i);
+
+	for (i = 0; i < padsize; i++)
+		pad[i] = ((uint8_t *)buf)[i];
+
+	for (pad[padsize++] = 0x80; (padsize & 63) != 56; padsize++)
+		pad[padsize] = 0;
+
+	for (i = 0; i < 8; i++)
+		pad[padsize++] = (size << 3) >> (56 - 8 * i);
+
+	for (i = 0; i < padsize; i += 64)
+		SHA256Transform(H, pad + i);
+
+	zcp->zc_word[0] = grub_cpu_to_zfs64((uint64_t)H[0] << 32 | H[1],
+										endian);
+	zcp->zc_word[1] = grub_cpu_to_zfs64((uint64_t)H[2] << 32 | H[3],
+										endian);
+	zcp->zc_word[2] = grub_cpu_to_zfs64((uint64_t)H[4] << 32 | H[5],
+										endian);
+	zcp->zc_word[3] = grub_cpu_to_zfs64((uint64_t)H[6] << 32 | H[7],
+										endian);
+}
diff --git a/include/config_cmd_all.h b/include/config_cmd_all.h
index 55f4f7a..5933ae9 100644
--- a/include/config_cmd_all.h
+++ b/include/config_cmd_all.h
@@ -36,6 +36,7 @@
 #define CONFIG_CMD_ELF		/* ELF (VxWorks) load/boot cmd	*/
 #define CONFIG_CMD_EXT2		/* EXT2 Support			*/
 #define CONFIG_CMD_FAT		/* FAT support			*/
+#define CONFIG_CMD_ZFS		/* ZFS support			*/
 #define CONFIG_CMD_FDC		/* Floppy Disk Support		*/
 #define CONFIG_CMD_FDOS		/* Floppy DOS support		*/
 #define CONFIG_CMD_FLASH	/* flinfo, erase, protect	*/
diff --git a/include/zfs/dmu.h b/include/zfs/dmu.h
new file mode 100644
index 0000000..bee317e
--- /dev/null
+++ b/include/zfs/dmu.h
@@ -0,0 +1,119 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_DMU_H
+#define	_SYS_DMU_H
+
+/*
+ * This file describes the interface that the DMU provides for its
+ * consumers.
+ *
+ * The DMU also interacts with the SPA.  That interface is described in
+ * dmu_spa.h.
+ */
+typedef enum dmu_object_type {
+	DMU_OT_NONE,
+	/* general: */
+	DMU_OT_OBJECT_DIRECTORY,	/* ZAP */
+	DMU_OT_OBJECT_ARRAY,		/* UINT64 */
+	DMU_OT_PACKED_NVLIST,		/* UINT8 (XDR by nvlist_pack/unpack) */
+	DMU_OT_PACKED_NVLIST_SIZE,	/* UINT64 */
+	DMU_OT_BPLIST,			/* UINT64 */
+	DMU_OT_BPLIST_HDR,		/* UINT64 */
+	/* spa: */
+	DMU_OT_SPACE_MAP_HEADER,	/* UINT64 */
+	DMU_OT_SPACE_MAP,		/* UINT64 */
+	/* zil: */
+	DMU_OT_INTENT_LOG,		/* UINT64 */
+	/* dmu: */
+	DMU_OT_DNODE,			/* DNODE */
+	DMU_OT_OBJSET,			/* OBJSET */
+	/* dsl: */
+	DMU_OT_DSL_DIR,			/* UINT64 */
+	DMU_OT_DSL_DIR_CHILD_MAP,	/* ZAP */
+	DMU_OT_DSL_DS_SNAP_MAP,		/* ZAP */
+	DMU_OT_DSL_PROPS,		/* ZAP */
+	DMU_OT_DSL_DATASET,		/* UINT64 */
+	/* zpl: */
+	DMU_OT_ZNODE,			/* ZNODE */
+	DMU_OT_OLDACL,			/* OLD ACL */
+	DMU_OT_PLAIN_FILE_CONTENTS,	/* UINT8 */
+	DMU_OT_DIRECTORY_CONTENTS,	/* ZAP */
+	DMU_OT_MASTER_NODE,		/* ZAP */
+	DMU_OT_UNLINKED_SET,		/* ZAP */
+	/* zvol: */
+	DMU_OT_ZVOL,			/* UINT8 */
+	DMU_OT_ZVOL_PROP,		/* ZAP */
+	/* other; for testing only! */
+	DMU_OT_PLAIN_OTHER,		/* UINT8 */
+	DMU_OT_UINT64_OTHER,		/* UINT64 */
+	DMU_OT_ZAP_OTHER,		/* ZAP */
+	/* new object types: */
+	DMU_OT_ERROR_LOG,		/* ZAP */
+	DMU_OT_SPA_HISTORY,		/* UINT8 */
+	DMU_OT_SPA_HISTORY_OFFSETS,	/* spa_his_phys_t */
+	DMU_OT_POOL_PROPS,		/* ZAP */
+	DMU_OT_DSL_PERMS,		/* ZAP */
+	DMU_OT_ACL,			/* ACL */
+	DMU_OT_SYSACL,			/* SYSACL */
+	DMU_OT_FUID,			/* FUID table (Packed NVLIST UINT8) */
+	DMU_OT_FUID_SIZE,		/* FUID table size UINT64 */
+	DMU_OT_NEXT_CLONES,		/* ZAP */
+	DMU_OT_SCRUB_QUEUE,		/* ZAP */
+	DMU_OT_USERGROUP_USED,		/* ZAP */
+	DMU_OT_USERGROUP_QUOTA,		/* ZAP */
+	DMU_OT_USERREFS,		/* ZAP */
+	DMU_OT_DDT_ZAP,			/* ZAP */
+	DMU_OT_DDT_STATS,		/* ZAP */
+	DMU_OT_SA,			/* System attr */
+	DMU_OT_SA_MASTER_NODE,		/* ZAP */
+	DMU_OT_SA_ATTR_REGISTRATION,	/* ZAP */
+	DMU_OT_SA_ATTR_LAYOUTS,		/* ZAP */
+	DMU_OT_NUMTYPES
+} dmu_object_type_t;
+
+typedef enum dmu_objset_type {
+	DMU_OST_NONE,
+	DMU_OST_META,
+	DMU_OST_ZFS,
+	DMU_OST_ZVOL,
+	DMU_OST_OTHER,			/* For testing only! */
+	DMU_OST_ANY,			/* Be careful! */
+	DMU_OST_NUMTYPES
+} dmu_objset_type_t;
+
+/*
+ * The names of zap entries in the DIRECTORY_OBJECT of the MOS.
+ */
+#define	DMU_POOL_DIRECTORY_OBJECT	1
+#define	DMU_POOL_CONFIG			"config"
+#define	DMU_POOL_ROOT_DATASET		"root_dataset"
+#define	DMU_POOL_SYNC_BPLIST		"sync_bplist"
+#define	DMU_POOL_ERRLOG_SCRUB		"errlog_scrub"
+#define	DMU_POOL_ERRLOG_LAST		"errlog_last"
+#define	DMU_POOL_SPARES			"spares"
+#define	DMU_POOL_DEFLATE		"deflate"
+#define	DMU_POOL_HISTORY		"history"
+#define	DMU_POOL_PROPS			"pool_props"
+#define	DMU_POOL_L2CACHE		"l2cache"
+
+#endif	/* _SYS_DMU_H */
diff --git a/include/zfs/dmu_objset.h b/include/zfs/dmu_objset.h
new file mode 100644
index 0000000..176cad7
--- /dev/null
+++ b/include/zfs/dmu_objset.h
@@ -0,0 +1,43 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *  Copyright (C) 2010  Robert Millan <rmh@gnu.org>
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_DMU_OBJSET_H
+#define	_SYS_DMU_OBJSET_H
+
+#include <zfs/zil.h>
+
+#define OBJSET_PHYS_SIZE	2048
+#define OBJSET_PHYS_SIZE_V14	1024
+
+typedef struct objset_phys {
+	dnode_phys_t os_meta_dnode;
+	zil_header_t os_zil_header;
+	uint64_t os_type;
+	uint64_t os_flags;
+	char os_pad[OBJSET_PHYS_SIZE - sizeof(dnode_phys_t)*3 -
+	    sizeof(zil_header_t) - sizeof(uint64_t)*2];
+	dnode_phys_t os_userused_dnode;
+	dnode_phys_t os_groupused_dnode;
+} objset_phys_t;
+
+#endif /* _SYS_DMU_OBJSET_H */
diff --git a/include/zfs/dnode.h b/include/zfs/dnode.h
new file mode 100644
index 0000000..9ec3d43
--- /dev/null
+++ b/include/zfs/dnode.h
@@ -0,0 +1,80 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * 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 */
diff --git a/include/zfs/dsl_dataset.h b/include/zfs/dsl_dataset.h
new file mode 100644
index 0000000..c6de7ab
--- /dev/null
+++ b/include/zfs/dsl_dataset.h
@@ -0,0 +1,52 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_DSL_DATASET_H
+#define	_SYS_DSL_DATASET_H
+
+typedef struct dsl_dataset_phys {
+	uint64_t ds_dir_obj;
+	uint64_t ds_prev_snap_obj;
+	uint64_t ds_prev_snap_txg;
+	uint64_t ds_next_snap_obj;
+	uint64_t ds_snapnames_zapobj;	/* zap obj of snaps; ==0 for snaps */
+	uint64_t ds_num_children;	/* clone/snap children; ==0 for head */
+	uint64_t ds_creation_time;	/* seconds since 1970 */
+	uint64_t ds_creation_txg;
+	uint64_t ds_deadlist_obj;
+	uint64_t ds_used_bytes;
+	uint64_t ds_compressed_bytes;
+	uint64_t ds_uncompressed_bytes;
+	uint64_t ds_unique_bytes;	/* only relevant to snapshots */
+	/*
+	 * The ds_fsid_guid is a 56-bit ID that can change to avoid
+	 * collisions.  The ds_guid is a 64-bit ID that will never
+	 * change, so there is a small probability that it will collide.
+	 */
+	uint64_t ds_fsid_guid;
+	uint64_t ds_guid;
+	uint64_t ds_flags;
+	blkptr_t ds_bp;
+	uint64_t ds_pad[8]; /* pad out to 320 bytes for good measure */
+} dsl_dataset_phys_t;
+
+#endif /* _SYS_DSL_DATASET_H */
diff --git a/include/zfs/dsl_dir.h b/include/zfs/dsl_dir.h
new file mode 100644
index 0000000..c04e0b6
--- /dev/null
+++ b/include/zfs/dsl_dir.h
@@ -0,0 +1,48 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_DSL_DIR_H
+#define	_SYS_DSL_DIR_H
+
+typedef struct dsl_dir_phys {
+	uint64_t dd_creation_time; /* not actually used */
+	uint64_t dd_head_dataset_obj;
+	uint64_t dd_parent_obj;
+	uint64_t dd_clone_parent_obj;
+	uint64_t dd_child_dir_zapobj;
+	/*
+	 * how much space our children are accounting for; for leaf
+	 * datasets, == physical space used by fs + snaps
+	 */
+	uint64_t dd_used_bytes;
+	uint64_t dd_compressed_bytes;
+	uint64_t dd_uncompressed_bytes;
+	/* Administrative quota setting */
+	uint64_t dd_quota;
+	/* Administrative reservation setting */
+	uint64_t dd_reserved;
+	uint64_t dd_props_zapobj;
+	uint64_t dd_deleg_zapobj;	/* dataset permissions */
+	uint64_t dd_pad[20]; /* pad out to 256 bytes for good measure */
+} dsl_dir_phys_t;
+
+#endif /* _SYS_DSL_DIR_H */
diff --git a/include/zfs/sa_impl.h b/include/zfs/sa_impl.h
new file mode 100644
index 0000000..4ec49fe
--- /dev/null
+++ b/include/zfs/sa_impl.h
@@ -0,0 +1,34 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+#ifndef	_SYS_SA_IMPL_H
+#define	_SYS_SA_IMPL_H
+
+typedef struct sa_hdr_phys {
+	uint32_t sa_magic;
+	uint16_t sa_layout_info;
+	uint16_t sa_lengths[1];
+} sa_hdr_phys_t;
+
+#define	SA_HDR_SIZE(hdr)	BF32_GET_SB(hdr->sa_layout_info, 10, 16, 3, 0)
+#define	SA_SIZE_OFFSET	0x8
+
+#endif	/* _SYS_SA_IMPL_H */
diff --git a/include/zfs/spa.h b/include/zfs/spa.h
new file mode 100644
index 0000000..100e2a6
--- /dev/null
+++ b/include/zfs/spa.h
@@ -0,0 +1,311 @@
+/*
+ *	GRUB  --  GRand Unified Bootloader
+ *	Copyright (C) 1999,2000,2001,2002,2003,2004,2009
+ *	Free Software Foundation, Inc.
+ *	Copyright 2010 Sun Microsystems, Inc.
+ *
+ *	GRUB 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 3 of the License, or
+ *	(at your option) any later version.
+ *
+ *	GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_ZFS_SPA_HEADER
+#define	GRUB_ZFS_SPA_HEADER 1
+
+typedef enum grub_zfs_endian {
+	UNKNOWN_ENDIAN = -2,
+	LITTLE_ENDIAN = -1,
+	BIG_ENDIAN = 0
+} grub_zfs_endian_t;
+
+
+#define grub_zfs_to_cpu16(x, a) (((a) == BIG_ENDIAN) ? grub_be_to_cpu16(x) \
+								: grub_le_to_cpu16(x))
+#define grub_cpu_to_zfs16(x, a) (((a) == BIG_ENDIAN) ? grub_cpu_to_be16(x) \
+								: grub_cpu_to_le16(x))
+
+#define grub_zfs_to_cpu32(x, a) (((a) == BIG_ENDIAN) ? grub_be_to_cpu32(x) \
+								: grub_le_to_cpu32(x))
+#define grub_cpu_to_zfs32(x, a) (((a) == BIG_ENDIAN) ? grub_cpu_to_be32(x) \
+								: grub_cpu_to_le32(x))
+
+#define grub_zfs_to_cpu64(x, a) (((a) == BIG_ENDIAN) ? grub_be_to_cpu64(x) \
+								: grub_le_to_cpu64(x))
+#define grub_cpu_to_zfs64(x, a) (((a) == BIG_ENDIAN) ? grub_cpu_to_be64(x) \
+								: grub_cpu_to_le64(x))
+
+/*
+ * General-purpose 32-bit and 64-bit bitfield encodings.
+ */
+#define	BF32_DECODE(x, low, len)	P2PHASE((x) >> (low), 1U << (len))
+#define	BF64_DECODE(x, low, len)	P2PHASE((x) >> (low), 1ULL << (len))
+#define	BF32_ENCODE(x, low, len)	(P2PHASE((x), 1U << (len)) << (low))
+#define	BF64_ENCODE(x, low, len)	(P2PHASE((x), 1ULL << (len)) << (low))
+
+#define	BF32_GET(x, low, len)		BF32_DECODE(x, low, len)
+#define	BF64_GET(x, low, len)		BF64_DECODE(x, low, len)
+
+#define	BF32_SET(x, low, len, val)						\
+	((x) ^= BF32_ENCODE((x >> low) ^ (val), low, len))
+#define	BF64_SET(x, low, len, val)						\
+	((x) ^= BF64_ENCODE((x >> low) ^ (val), low, len))
+
+#define	BF32_GET_SB(x, low, len, shift, bias)		\
+	((BF32_GET(x, low, len) + (bias)) << (shift))
+#define	BF64_GET_SB(x, low, len, shift, bias)		\
+	((BF64_GET(x, low, len) + (bias)) << (shift))
+
+#define	BF32_SET_SB(x, low, len, shift, bias, val)		\
+	BF32_SET(x, low, len, ((val) >> (shift)) - (bias))
+#define	BF64_SET_SB(x, low, len, shift, bias, val)		\
+	BF64_SET(x, low, len, ((val) >> (shift)) - (bias))
+
+/*
+ * We currently support nine block sizes, from 512 bytes to 128K.
+ * We could go higher, but the benefits are near-zero and the cost
+ * of COWing a giant block to modify one byte would become excessive.
+ */
+#define	SPA_MINBLOCKSHIFT	9
+#define	SPA_MAXBLOCKSHIFT	17
+#define	SPA_MINBLOCKSIZE	(1ULL << SPA_MINBLOCKSHIFT)
+#define	SPA_MAXBLOCKSIZE	(1ULL << SPA_MAXBLOCKSHIFT)
+
+#define	SPA_BLOCKSIZES		(SPA_MAXBLOCKSHIFT - SPA_MINBLOCKSHIFT + 1)
+
+/*
+ * Size of block to hold the configuration data (a packed nvlist)
+ */
+#define	SPA_CONFIG_BLOCKSIZE	(1 << 14)
+
+/*
+ * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
+ * The ASIZE encoding should be at least 64 times larger (6 more bits)
+ * to support up to 4-way RAID-Z mirror mode with worst-case gang block
+ * overhead, three DVAs per bp, plus one more bit in case we do anything
+ * else that expands the ASIZE.
+ */
+#define	SPA_LSIZEBITS		16	/* LSIZE up to 32M (2^16 * 512)	*/
+#define	SPA_PSIZEBITS		16	/* PSIZE up to 32M (2^16 * 512)	*/
+#define	SPA_ASIZEBITS		24	/* ASIZE up to 64 times larger	*/
+
+/*
+ * All SPA data is represented by 128-bit data virtual addresses (DVAs).
+ * The members of the dva_t should be considered opaque outside the SPA.
+ */
+typedef struct dva {
+	uint64_t	dva_word[2];
+} dva_t;
+
+/*
+ * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
+ */
+typedef struct zio_cksum {
+	uint64_t	zc_word[4];
+} zio_cksum_t;
+
+/*
+ * Each block is described by its DVAs, time of birth, checksum, etc.
+ * The word-by-word, bit-by-bit layout of the blkptr is as follows:
+ *
+ *	64	56	48	40	32	24	16	8	0
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * 0	|		vdev1		| GRID	|	  ASIZE		|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * 1	|G|			 offset1				|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * 2	|		vdev2		| GRID	|	  ASIZE		|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * 3	|G|			 offset2				|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * 4	|		vdev3		| GRID	|	  ASIZE		|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * 5	|G|			 offset3				|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * 6	|BDX|lvl| type	| cksum | comp	|	  PSIZE	|	  LSIZE	|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * 7	|			padding					|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * 8	|			padding					|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * 9	|			physical birth txg			|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * a	|			logical birth txg			|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * b	|			fill count				|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * c	|			checksum[0]				|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * d	|			checksum[1]				|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * e	|			checksum[2]				|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ * f	|			checksum[3]				|
+ *	+-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * Legend:
+ *
+ * vdev		virtual device ID
+ * offset	offset into virtual device
+ * LSIZE	logical size
+ * PSIZE	physical size (after compression)
+ * ASIZE	allocated size (including RAID-Z parity and gang block headers)
+ * GRID		RAID-Z layout information (reserved for future use)
+ * cksum	checksum function
+ * comp		compression function
+ * G		gang block indicator
+ * B		byteorder (endianness)
+ * D		dedup
+ * X		unused
+ * lvl		level of indirection
+ * type		DMU object type
+ * phys birth	txg of block allocation; zero if same as logical birth txg
+ * log. birth	transaction group in which the block was logically born
+ * fill count	number of non-zero blocks under this bp
+ * checksum[4]	256-bit checksum of the data this bp describes
+ */
+#define	SPA_BLKPTRSHIFT	7		/* blkptr_t is 128 bytes	*/
+#define	SPA_DVAS_PER_BP	3		/* Number of DVAs in a bp	*/
+
+typedef struct blkptr {
+	dva_t		blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
+	uint64_t	blk_prop;	/* size, compression, type, etc		*/
+	uint64_t	blk_pad[2];	/* Extra space for the future		*/
+	uint64_t	blk_phys_birth;	/* txg when block was allocated		*/
+	uint64_t	blk_birth;	/* transaction group at birth		*/
+	uint64_t	blk_fill;	/* fill count				*/
+	zio_cksum_t	blk_cksum;	/* 256-bit checksum			*/
+} blkptr_t;
+
+/*
+ * Macros to get and set fields in a bp or DVA.
+ */
+#define	DVA_GET_ASIZE(dva)											\
+	BF64_GET_SB((dva)->dva_word[0], 0, 24, SPA_MINBLOCKSHIFT, 0)
+#define	DVA_SET_ASIZE(dva, x)										\
+	BF64_SET_SB((dva)->dva_word[0], 0, 24, SPA_MINBLOCKSHIFT, 0, x)
+
+#define	DVA_GET_GRID(dva)	BF64_GET((dva)->dva_word[0], 24, 8)
+#define	DVA_SET_GRID(dva, x)	BF64_SET((dva)->dva_word[0], 24, 8, x)
+
+#define	DVA_GET_VDEV(dva)	BF64_GET((dva)->dva_word[0], 32, 32)
+#define	DVA_SET_VDEV(dva, x)	BF64_SET((dva)->dva_word[0], 32, 32, x)
+
+#define	DVA_GET_GANG(dva)	BF64_GET((dva)->dva_word[1], 63, 1)
+#define	DVA_SET_GANG(dva, x)	BF64_SET((dva)->dva_word[1], 63, 1, x)
+
+#define	BP_GET_LSIZE(bp)										\
+	BF64_GET_SB((bp)->blk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1)
+#define	BP_SET_LSIZE(bp, x)										\
+	BF64_SET_SB((bp)->blk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1, x)
+
+#define	BP_GET_COMPRESS(bp)		BF64_GET((bp)->blk_prop, 32, 8)
+#define	BP_SET_COMPRESS(bp, x)		BF64_SET((bp)->blk_prop, 32, 8, x)
+
+#define	BP_GET_CHECKSUM(bp)		BF64_GET((bp)->blk_prop, 40, 8)
+#define	BP_SET_CHECKSUM(bp, x)		BF64_SET((bp)->blk_prop, 40, 8, x)
+
+#define	BP_GET_TYPE(bp)			BF64_GET((bp)->blk_prop, 48, 8)
+#define	BP_SET_TYPE(bp, x)		BF64_SET((bp)->blk_prop, 48, 8, x)
+
+#define	BP_GET_LEVEL(bp)		BF64_GET((bp)->blk_prop, 56, 5)
+#define	BP_SET_LEVEL(bp, x)		BF64_SET((bp)->blk_prop, 56, 5, x)
+
+#define	BP_GET_PROP_BIT_61(bp)		BF64_GET((bp)->blk_prop, 61, 1)
+#define	BP_SET_PROP_BIT_61(bp, x)	BF64_SET((bp)->blk_prop, 61, 1, x)
+
+#define	BP_GET_DEDUP(bp)		BF64_GET((bp)->blk_prop, 62, 1)
+#define	BP_SET_DEDUP(bp, x)		BF64_SET((bp)->blk_prop, 62, 1, x)
+
+#define	BP_GET_BYTEORDER(bp)		(0 - BF64_GET((bp)->blk_prop, 63, 1))
+#define	BP_SET_BYTEORDER(bp, x)		BF64_SET((bp)->blk_prop, 63, 1, x)
+
+#define	BP_PHYSICAL_BIRTH(bp)										\
+	((bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)
+
+#define	BP_SET_BIRTH(bp, logical, physical)								\
+	{																	\
+		(bp)->blk_birth = (logical);									\
+		(bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \
+	}
+
+#define	BP_GET_ASIZE(bp)												\
+	(DVA_GET_ASIZE(&(bp)->blk_dva[0]) + DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
+	 DVA_GET_ASIZE(&(bp)->blk_dva[2]))
+
+#define	BP_GET_UCSIZE(bp)												\
+	((BP_GET_LEVEL(bp) > 0 || dmu_ot[BP_GET_TYPE(bp)].ot_metadata) ?	\
+	 BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp));
+
+#define	BP_GET_NDVAS(bp)						\
+	(!!DVA_GET_ASIZE(&(bp)->blk_dva[0]) +		\
+	 !!DVA_GET_ASIZE(&(bp)->blk_dva[1]) +		\
+	 !!DVA_GET_ASIZE(&(bp)->blk_dva[2]))
+
+#define	BP_COUNT_GANG(bp)						\
+	(DVA_GET_GANG(&(bp)->blk_dva[0]) +			\
+	 DVA_GET_GANG(&(bp)->blk_dva[1]) +			\
+	 DVA_GET_GANG(&(bp)->blk_dva[2]))
+
+#define	DVA_EQUAL(dva1, dva2)						\
+	((dva1)->dva_word[1] == (dva2)->dva_word[1] &&	\
+	 (dva1)->dva_word[0] == (dva2)->dva_word[0])
+
+#define	BP_EQUAL(bp1, bp2)									\
+	(BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) &&	\
+	 DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) &&	\
+	 DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) &&	\
+	 DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2]))
+
+#define	ZIO_CHECKSUM_EQUAL(zc1, zc2)				\
+	(0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) |	\
+		   ((zc1).zc_word[1] - (zc2).zc_word[1]) |	\
+		   ((zc1).zc_word[2] - (zc2).zc_word[2]) |	\
+		   ((zc1).zc_word[3] - (zc2).zc_word[3])))
+
+#define	DVA_IS_VALID(dva)	(DVA_GET_ASIZE(dva) != 0)
+
+#define	ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3)	\
+	{											\
+		(zcp)->zc_word[0] = w0;					\
+		(zcp)->zc_word[1] = w1;					\
+		(zcp)->zc_word[2] = w2;					\
+		(zcp)->zc_word[3] = w3;					\
+	}
+
+#define	BP_IDENTITY(bp)		(&(bp)->blk_dva[0])
+#define	BP_IS_GANG(bp)		DVA_GET_GANG(BP_IDENTITY(bp))
+#define	BP_IS_HOLE(bp)		((bp)->blk_birth == 0)
+
+/* BP_IS_RAIDZ(bp) assumes no block compression */
+#define	BP_IS_RAIDZ(bp)		(DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \
+							 BP_GET_PSIZE(bp))
+
+#define	BP_ZERO(bp)										\
+	{													\
+		(bp)->blk_dva[0].dva_word[0] = 0;				\
+		(bp)->blk_dva[0].dva_word[1] = 0;				\
+		(bp)->blk_dva[1].dva_word[0] = 0;				\
+		(bp)->blk_dva[1].dva_word[1] = 0;				\
+		(bp)->blk_dva[2].dva_word[0] = 0;				\
+		(bp)->blk_dva[2].dva_word[1] = 0;				\
+		(bp)->blk_prop = 0;								\
+		(bp)->blk_pad[0] = 0;							\
+		(bp)->blk_pad[1] = 0;							\
+		(bp)->blk_phys_birth = 0;						\
+		(bp)->blk_birth = 0;							\
+		(bp)->blk_fill = 0;								\
+		ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0);	\
+	}
+
+#define	BP_SPRINTF_LEN	320
+
+#endif	/* ! GRUB_ZFS_SPA_HEADER */
diff --git a/include/zfs/uberblock_impl.h b/include/zfs/uberblock_impl.h
new file mode 100644
index 0000000..12daf98
--- /dev/null
+++ b/include/zfs/uberblock_impl.h
@@ -0,0 +1,57 @@
+/*
+ *	GRUB  --  GRand Unified Bootloader
+ *	Copyright (C) 1999,2000,2001,2002,2003,2004
+ *  Free Software Foundation, Inc.
+ *
+ *	GRUB 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 3 of the License, or
+ *	(at your option) any later version.
+ *
+ *	GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2010 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 */
diff --git a/include/zfs/vdev_impl.h b/include/zfs/vdev_impl.h
new file mode 100644
index 0000000..97033c9
--- /dev/null
+++ b/include/zfs/vdev_impl.h
@@ -0,0 +1,69 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_VDEV_IMPL_H
+#define	_SYS_VDEV_IMPL_H
+
+#define	VDEV_SKIP_SIZE		(8 << 10)
+#define	VDEV_BOOT_HEADER_SIZE	(8 << 10)
+#define	VDEV_PHYS_SIZE		(112 << 10)
+#define	VDEV_UBERBLOCK_RING	(128 << 10)
+
+/* ZFS boot block */
+#define	VDEV_BOOT_MAGIC		0x2f5b007b10cULL
+#define	VDEV_BOOT_VERSION	1		/* version number	*/
+
+typedef struct vdev_boot_header {
+	uint64_t	vb_magic;		/* VDEV_BOOT_MAGIC	*/
+	uint64_t	vb_version;		/* VDEV_BOOT_VERSION	*/
+	uint64_t	vb_offset;		/* start offset	(bytes) */
+	uint64_t	vb_size;		/* size (bytes)		*/
+	char		vb_pad[VDEV_BOOT_HEADER_SIZE - 4 * sizeof(uint64_t)];
+} vdev_boot_header_t;
+
+typedef struct vdev_phys {
+	char		vp_nvlist[VDEV_PHYS_SIZE - sizeof(zio_eck_t)];
+	zio_eck_t	vp_zbt;
+} vdev_phys_t;
+
+typedef struct vdev_label {
+	char		vl_pad[VDEV_SKIP_SIZE];			/*   8K	*/
+	vdev_boot_header_t vl_boot_header;			/*   8K	*/
+	vdev_phys_t	vl_vdev_phys;				/* 112K	*/
+	char		vl_uberblock[VDEV_UBERBLOCK_RING];	/* 128K	*/
+} vdev_label_t;							/* 256K total */
+
+/*
+ * Size and offset of embedded boot loader region on each label.
+ * The total size of the first two labels plus the boot area is 4MB.
+ */
+#define	VDEV_BOOT_OFFSET	(2 * sizeof(vdev_label_t))
+#define	VDEV_BOOT_SIZE		(7ULL << 19)			/* 3.5M	*/
+
+/*
+ * Size of label regions at the start and end of each leaf device.
+ */
+#define	VDEV_LABEL_START_SIZE	(2 * sizeof(vdev_label_t) + VDEV_BOOT_SIZE)
+#define	VDEV_LABEL_END_SIZE	(2 * sizeof(vdev_label_t))
+#define	VDEV_LABELS		4
+
+#endif	/* _SYS_VDEV_IMPL_H */
diff --git a/include/zfs/zap_impl.h b/include/zfs/zap_impl.h
new file mode 100644
index 0000000..65e9311
--- /dev/null
+++ b/include/zfs/zap_impl.h
@@ -0,0 +1,112 @@
+/*
+ *	GRUB  --  GRand Unified Bootloader
+ *	Copyright (C) 1999,2000,2001,2002,2003,2004
+ *  Free Software Foundation, Inc.
+ *
+ *	GRUB 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 3 of the License, or
+ *	(at your option) any later version.
+ *
+ *	GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_ZAP_IMPL_H
+#define	_SYS_ZAP_IMPL_H
+
+#define	ZAP_MAGIC 0x2F52AB2ABULL
+
+#define	ZAP_HASHBITS		28
+#define	MZAP_ENT_LEN		64
+#define	MZAP_NAME_LEN		(MZAP_ENT_LEN - 8 - 4 - 2)
+#define	MZAP_MAX_BLKSHIFT	SPA_MAXBLOCKSHIFT
+#define	MZAP_MAX_BLKSZ		(1 << MZAP_MAX_BLKSHIFT)
+
+typedef struct mzap_ent_phys {
+	uint64_t mze_value;
+	uint32_t mze_cd;
+	uint16_t mze_pad;	/* in case we want to chain them someday */
+	char mze_name[MZAP_NAME_LEN];
+} mzap_ent_phys_t;
+
+typedef struct mzap_phys {
+	uint64_t mz_block_type;	/* ZBT_MICRO */
+	uint64_t mz_salt;
+	uint64_t mz_pad[6];
+	mzap_ent_phys_t mz_chunk[1];
+	/* actually variable size depending on block size */
+} mzap_phys_t;
+
+/*
+ * The (fat) zap is stored in one object. It is an array of
+ * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of:
+ *
+ * ptrtbl fits in first block:
+ *	[zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ...
+ *
+ * ptrtbl too big for first block:
+ *	[zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ...
+ *
+ */
+
+#define	ZBT_LEAF		((1ULL << 63) + 0)
+#define	ZBT_HEADER		((1ULL << 63) + 1)
+#define	ZBT_MICRO		((1ULL << 63) + 3)
+/* any other values are ptrtbl blocks */
+
+/*
+ * the embedded pointer table takes up half a block:
+ * block size / entry size (2^3) / 2
+ */
+#define	ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1)
+
+/*
+ * The embedded pointer table starts half-way through the block.  Since
+ * the pointer table itself is half the block, it starts at (64-bit)
+ * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)).
+ */
+#define	ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \
+	((uint64_t *)(zap)->zap_f.zap_phys) \
+	[(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))]
+
+/*
+ * TAKE NOTE:
+ * If zap_phys_t is modified, zap_byteswap() must be modified.
+ */
+typedef struct zap_phys {
+	uint64_t zap_block_type;	/* ZBT_HEADER */
+	uint64_t zap_magic;		/* ZAP_MAGIC */
+
+	struct zap_table_phys {
+		uint64_t zt_blk;	/* starting block number */
+		uint64_t zt_numblks;	/* number of blocks */
+		uint64_t zt_shift;	/* bits to index it */
+		uint64_t zt_nextblk;	/* next (larger) copy start block */
+		uint64_t zt_blks_copied; /* number source blocks copied */
+	} zap_ptrtbl;
+
+	uint64_t zap_freeblk;		/* the next free block */
+	uint64_t zap_num_leafs;		/* number of leafs */
+	uint64_t zap_num_entries;	/* number of entries */
+	uint64_t zap_salt;		/* salt to stir into hash function */
+	uint64_t zap_normflags;		/* flags for u8_textprep_str() */
+	uint64_t zap_flags;		/* zap_flag_t */
+	/*
+	 * This structure is followed by padding, and then the embedded
+	 * pointer table.  The embedded pointer table takes up second
+	 * half of the block.  It is accessed using the
+	 * ZAP_EMBEDDED_PTRTBL_ENT() macro.
+	 */
+} zap_phys_t;
+
+#endif /* _SYS_ZAP_IMPL_H */
diff --git a/include/zfs/zap_leaf.h b/include/zfs/zap_leaf.h
new file mode 100644
index 0000000..4ddddb5
--- /dev/null
+++ b/include/zfs/zap_leaf.h
@@ -0,0 +1,103 @@
+/*
+ *	GRUB  --  GRand Unified Bootloader
+ *	Copyright (C) 1999,2000,2001,2002,2003,2004
+ *  Free Software Foundation, Inc.
+ *
+ *	GRUB 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 3 of the License, or
+ *	(at your option) any later version.
+ *
+ *	GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_ZAP_LEAF_H
+#define	_SYS_ZAP_LEAF_H
+
+#define	ZAP_LEAF_MAGIC 0x2AB1EAF
+
+/* chunk size = 24 bytes */
+#define	ZAP_LEAF_CHUNKSIZE 24
+
+/*
+ * The amount of space within the chunk available for the array is:
+ * chunk size - space for type (1) - space for next pointer (2)
+ */
+#define	ZAP_LEAF_ARRAY_BYTES (ZAP_LEAF_CHUNKSIZE - 3)
+
+typedef enum zap_chunk_type {
+	ZAP_CHUNK_FREE = 253,
+	ZAP_CHUNK_ENTRY = 252,
+	ZAP_CHUNK_ARRAY = 251,
+	ZAP_CHUNK_TYPE_MAX = 250
+} zap_chunk_type_t;
+
+/*
+ * TAKE NOTE:
+ * If zap_leaf_phys_t is modified, zap_leaf_byteswap() must be modified.
+ */
+typedef struct zap_leaf_phys {
+	struct zap_leaf_header {
+		uint64_t lh_block_type;		/* ZBT_LEAF */
+		uint64_t lh_pad1;
+		uint64_t lh_prefix;		/* hash prefix of this leaf */
+		uint32_t lh_magic;		/* ZAP_LEAF_MAGIC */
+		uint16_t lh_nfree;		/* number free chunks */
+		uint16_t lh_nentries;		/* number of entries */
+		uint16_t lh_prefix_len;		/* num bits used to id this */
+
+		/* above is accessable to zap, below is zap_leaf private */
+
+		uint16_t lh_freelist;		/* chunk head of free list */
+		uint8_t lh_pad2[12];
+	} l_hdr; /* 2 24-byte chunks */
+
+	/*
+	 * The header is followed by a hash table with
+	 * ZAP_LEAF_HASH_NUMENTRIES(zap) entries.  The hash table is
+	 * followed by an array of ZAP_LEAF_NUMCHUNKS(zap)
+	 * zap_leaf_chunk structures.  These structures are accessed
+	 * with the ZAP_LEAF_CHUNK() macro.
+	 */
+
+	uint16_t l_hash[1];
+} zap_leaf_phys_t;
+
+typedef union zap_leaf_chunk {
+	struct zap_leaf_entry {
+		uint8_t le_type;		/* always ZAP_CHUNK_ENTRY */
+		uint8_t le_int_size;		/* size of ints */
+		uint16_t le_next;		/* next entry in hash chain */
+		uint16_t le_name_chunk;		/* first chunk of the name */
+		uint16_t le_name_length;	/* bytes in name, incl null */
+		uint16_t le_value_chunk;	/* first chunk of the value */
+		uint16_t le_value_length;	/* value length in ints */
+		uint32_t le_cd;		/* collision differentiator */
+		uint64_t le_hash;		/* hash value of the name */
+	} l_entry;
+	struct zap_leaf_array {
+		uint8_t la_type;		/* always ZAP_CHUNK_ARRAY */
+		union {
+			uint8_t la_array[ZAP_LEAF_ARRAY_BYTES];
+			uint64_t la_array64;
+		} __attribute__ ((packed));
+		uint16_t la_next;		/* next blk or CHAIN_END */
+	} l_array;
+	struct zap_leaf_free {
+		uint8_t lf_type;		/* always ZAP_CHUNK_FREE */
+		uint8_t lf_pad[ZAP_LEAF_ARRAY_BYTES];
+		uint16_t lf_next;	/* next in free list, or CHAIN_END */
+	} l_free;
+} zap_leaf_chunk_t;
+
+#endif /* _SYS_ZAP_LEAF_H */
diff --git a/include/zfs/zfs.h b/include/zfs/zfs.h
new file mode 100644
index 0000000..b6d41c0
--- /dev/null
+++ b/include/zfs/zfs.h
@@ -0,0 +1,122 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004,2009
+ *  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ /*
+  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+  */
+
+#ifndef	GRUB_ZFS_HEADER
+#define	GRUB_ZFS_HEADER 1
+
+
+/*
+ * On-disk version number.
+ */
+#define	SPA_VERSION			28ULL
+
+/*
+ * The following are configuration names used in the nvlist describing a pool's
+ * configuration.
+ */
+#define	ZPOOL_CONFIG_VERSION		"version"
+#define	ZPOOL_CONFIG_POOL_NAME		"name"
+#define	ZPOOL_CONFIG_POOL_STATE		"state"
+#define	ZPOOL_CONFIG_POOL_TXG		"txg"
+#define	ZPOOL_CONFIG_POOL_GUID		"pool_guid"
+#define	ZPOOL_CONFIG_CREATE_TXG		"create_txg"
+#define	ZPOOL_CONFIG_TOP_GUID		"top_guid"
+#define	ZPOOL_CONFIG_VDEV_TREE		"vdev_tree"
+#define	ZPOOL_CONFIG_TYPE		"type"
+#define	ZPOOL_CONFIG_CHILDREN		"children"
+#define	ZPOOL_CONFIG_ID			"id"
+#define	ZPOOL_CONFIG_GUID		"guid"
+#define	ZPOOL_CONFIG_PATH		"path"
+#define	ZPOOL_CONFIG_DEVID		"devid"
+#define	ZPOOL_CONFIG_METASLAB_ARRAY	"metaslab_array"
+#define	ZPOOL_CONFIG_METASLAB_SHIFT	"metaslab_shift"
+#define	ZPOOL_CONFIG_ASHIFT		"ashift"
+#define	ZPOOL_CONFIG_ASIZE		"asize"
+#define	ZPOOL_CONFIG_DTL		"DTL"
+#define	ZPOOL_CONFIG_STATS		"stats"
+#define	ZPOOL_CONFIG_WHOLE_DISK		"whole_disk"
+#define	ZPOOL_CONFIG_ERRCOUNT		"error_count"
+#define	ZPOOL_CONFIG_NOT_PRESENT	"not_present"
+#define	ZPOOL_CONFIG_SPARES		"spares"
+#define	ZPOOL_CONFIG_IS_SPARE		"is_spare"
+#define	ZPOOL_CONFIG_NPARITY		"nparity"
+#define	ZPOOL_CONFIG_PHYS_PATH		"phys_path"
+#define	ZPOOL_CONFIG_L2CACHE		"l2cache"
+#define	ZPOOL_CONFIG_HOLE_ARRAY		"hole_array"
+#define	ZPOOL_CONFIG_VDEV_CHILDREN	"vdev_children"
+#define	ZPOOL_CONFIG_IS_HOLE		"is_hole"
+#define	ZPOOL_CONFIG_DDT_HISTOGRAM	"ddt_histogram"
+#define	ZPOOL_CONFIG_DDT_OBJ_STATS	"ddt_object_stats"
+#define	ZPOOL_CONFIG_DDT_STATS		"ddt_stats"
+/*
+ * The persistent vdev state is stored as separate values rather than a single
+ * 'vdev_state' entry.  This is because a device can be in multiple states, such
+ * as offline and degraded.
+ */
+#define	ZPOOL_CONFIG_OFFLINE		"offline"
+#define	ZPOOL_CONFIG_FAULTED		"faulted"
+#define	ZPOOL_CONFIG_DEGRADED		"degraded"
+#define	ZPOOL_CONFIG_REMOVED		"removed"
+
+#define	VDEV_TYPE_ROOT			"root"
+#define	VDEV_TYPE_MIRROR		"mirror"
+#define	VDEV_TYPE_REPLACING		"replacing"
+#define	VDEV_TYPE_RAIDZ			"raidz"
+#define	VDEV_TYPE_DISK			"disk"
+#define	VDEV_TYPE_FILE			"file"
+#define	VDEV_TYPE_MISSING		"missing"
+#define	VDEV_TYPE_HOLE			"hole"
+#define	VDEV_TYPE_SPARE			"spare"
+#define	VDEV_TYPE_L2CACHE		"l2cache"
+
+/*
+ * pool state.  The following states are written to disk as part of the normal
+ * SPA lifecycle: ACTIVE, EXPORTED, DESTROYED, SPARE, L2CACHE.  The remaining
+ * states are software abstractions used at various levels to communicate pool
+ * state.
+ */
+typedef enum pool_state {
+	POOL_STATE_ACTIVE = 0,		/* In active use		*/
+	POOL_STATE_EXPORTED,		/* Explicitly exported		*/
+	POOL_STATE_DESTROYED,		/* Explicitly destroyed		*/
+	POOL_STATE_SPARE,		/* Reserved for hot spare use	*/
+	POOL_STATE_L2CACHE,		/* Level 2 ARC device		*/
+	POOL_STATE_UNINITIALIZED,	/* Internal spa_t state		*/
+	POOL_STATE_UNAVAIL,		/* Internal libzfs state	*/
+	POOL_STATE_POTENTIALLY_ACTIVE	/* Internal libzfs state	*/
+} pool_state_t;
+
+struct grub_zfs_data;
+
+int grub_zfs_fetch_nvlist(device_t dev, char **nvlist);
+int grub_zfs_getmdnobj(device_t dev, const char *fsfilename,
+			       uint64_t *mdnobj);
+
+char *grub_zfs_nvlist_lookup_string(char *nvlist, char *name);
+char *grub_zfs_nvlist_lookup_nvlist(char *nvlist, char *name);
+int grub_zfs_nvlist_lookup_uint64(char *nvlist, char *name,
+				   uint64_t *out);
+char *grub_zfs_nvlist_lookup_nvlist_array(char *nvlist, char *name,
+					   size_t index);
+int grub_zfs_nvlist_lookup_nvlist_array_get_nelm(char *nvlist, char *name);
+
+#endif	/* ! GRUB_ZFS_HEADER */
diff --git a/include/zfs/zfs_acl.h b/include/zfs/zfs_acl.h
new file mode 100644
index 0000000..66749af
--- /dev/null
+++ b/include/zfs/zfs_acl.h
@@ -0,0 +1,55 @@
+/*
+ *	GRUB  --  GRand Unified Bootloader
+ *	Copyright (C) 1999,2000,2001,2002,2003,2004
+ *  Free Software Foundation, Inc.
+ *
+ *	GRUB 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 3 of the License, or
+ *	(at your option) any later version.
+ *
+ *	GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_FS_ZFS_ACL_H
+#define	_SYS_FS_ZFS_ACL_H
+
+typedef struct zfs_oldace {
+	uint32_t	z_fuid;		/* "who" */
+	uint32_t	z_access_mask;	/* access mask */
+	uint16_t	z_flags;	/* flags, i.e inheritance */
+	uint16_t	z_type;		/* type of entry allow/deny */
+} zfs_oldace_t;
+
+#define	ACE_SLOT_CNT	6
+
+typedef struct zfs_znode_acl_v0 {
+	uint64_t	z_acl_extern_obj;	  /* ext acl pieces */
+	uint32_t	z_acl_count;		  /* Number of ACEs */
+	uint16_t	z_acl_version;		  /* acl version */
+	uint16_t	z_acl_pad;		  /* pad */
+	zfs_oldace_t	z_ace_data[ACE_SLOT_CNT]; /* 6 standard ACEs */
+} zfs_znode_acl_v0_t;
+
+#define	ZFS_ACE_SPACE	(sizeof(zfs_oldace_t) * ACE_SLOT_CNT)
+
+typedef struct zfs_znode_acl {
+	uint64_t	z_acl_extern_obj;	  /* ext acl pieces */
+	uint32_t	z_acl_size;		  /* Number of bytes in ACL */
+	uint16_t	z_acl_version;		  /* acl version */
+	uint16_t	z_acl_count;		  /* ace count */
+	uint8_t	z_ace_data[ZFS_ACE_SPACE]; /* space for embedded ACEs */
+} zfs_znode_acl_t;
+
+
+#endif	/* _SYS_FS_ZFS_ACL_H */
diff --git a/include/zfs/zfs_znode.h b/include/zfs/zfs_znode.h
new file mode 100644
index 0000000..e3265e3
--- /dev/null
+++ b/include/zfs/zfs_znode.h
@@ -0,0 +1,70 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_FS_ZFS_ZNODE_H
+#define	_SYS_FS_ZFS_ZNODE_H
+
+#include <zfs/zfs_acl.h>
+
+#define	MASTER_NODE_OBJ	1
+#define	ZFS_ROOT_OBJ		"ROOT"
+#define	ZPL_VERSION_STR		"VERSION"
+#define	ZFS_SA_ATTRS		"SA_ATTRS"
+
+#define	ZPL_VERSION		5ULL
+
+#define	ZFS_DIRENT_OBJ(de) BF64_GET(de, 0, 48)
+
+/*
+ * This is the persistent portion of the znode.  It is stored
+ * in the "bonus buffer" of the file.  Short symbolic links
+ * are also stored in the bonus buffer.
+ */
+typedef struct znode_phys {
+	uint64_t zp_atime[2];      /*  0 - last file access time */
+	uint64_t zp_mtime[2];	/* 16 - last file modification time */
+	uint64_t zp_ctime[2];	/* 32 - last file change time */
+	uint64_t zp_crtime[2];	/* 48 - creation time */
+	uint64_t zp_gen;		/* 64 - generation (txg of creation) */
+	uint64_t zp_mode;		/* 72 - file mode bits */
+	uint64_t zp_size;		/* 80 - size of file */
+	uint64_t zp_parent;	/* 88 - directory parent (`..') */
+	uint64_t zp_links;		/* 96 - number of links to file */
+	uint64_t zp_xattr;		/* 104 - DMU object for xattrs */
+	uint64_t zp_rdev;		/* 112 - dev_t for VBLK & VCHR files */
+	uint64_t zp_flags;		/* 120 - persistent flags */
+	uint64_t zp_uid;		/* 128 - file owner */
+	uint64_t zp_gid;		/* 136 - owning group */
+	uint64_t zp_pad[4];	/* 144 - future */
+	zfs_znode_acl_t zp_acl;		/* 176 - 263 ACL */
+	/*
+	 * Data may pad out any remaining bytes in the znode buffer, eg:
+	 *
+	 * |<---------------------- dnode_phys (512) ------------------------>|
+	 * |<-- dnode (192) --->|<----------- "bonus" buffer (320) ---------->|
+	 *			|<---- znode (264) ---->|<---- data (56) ---->|
+	 *
+	 * At present, we only use this space to store symbolic links.
+	 */
+} znode_phys_t;
+
+#endif	/* _SYS_FS_ZFS_ZNODE_H */
diff --git a/include/zfs/zil.h b/include/zfs/zil.h
new file mode 100644
index 0000000..bc9d5e9
--- /dev/null
+++ b/include/zfs/zil.h
@@ -0,0 +1,56 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_ZIL_H
+#define	_SYS_ZIL_H
+
+/*
+ * Intent log format:
+ *
+ * Each objset has its own intent log.  The log header (zil_header_t)
+ * for objset N's intent log is kept in the Nth object of the SPA's
+ * intent_log objset.  The log header points to a chain of log blocks,
+ * each of which contains log records (i.e., transactions) followed by
+ * a log block trailer (zil_trailer_t).  The format of a log record
+ * depends on the record (or transaction) type, but all records begin
+ * with a common structure that defines the type, length, and txg.
+ */
+
+/*
+ * Intent log header - this on disk structure holds fields to manage
+ * the log.  All fields are 64 bit to easily handle cross architectures.
+ */
+typedef struct zil_header {
+	uint64_t zh_claim_txg;   /* txg in which log blocks were claimed */
+	uint64_t zh_replay_seq;  /* highest replayed sequence number */
+	blkptr_t zh_log;	/* log chain */
+	uint64_t zh_claim_seq;	/* highest claimed sequence number */
+	uint64_t zh_flags;	/* header flags */
+	uint64_t zh_pad[4];
+} zil_header_t;
+
+/*
+ * zh_flags bit settings
+ */
+#define	ZIL_REPLAY_NEEDED 0x1	/* replay needed - internal only */
+
+#endif	/* _SYS_ZIL_H */
diff --git a/include/zfs/zio.h b/include/zfs/zio.h
new file mode 100644
index 0000000..38f90d5
--- /dev/null
+++ b/include/zfs/zio.h
@@ -0,0 +1,92 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _ZIO_H
+#define	_ZIO_H
+
+#include <zfs/spa.h>
+
+#define	ZEC_MAGIC	0x210da7ab10c7a11ULL	/* zio data bloc tail */
+
+typedef struct zio_eck {
+	uint64_t	zec_magic;	/* for validation, endianness	*/
+	zio_cksum_t	zec_cksum;	/* 256-bit checksum		*/
+} zio_eck_t;
+
+/*
+ * Gang block headers are self-checksumming and contain an array
+ * of block pointers.
+ */
+#define	SPA_GANGBLOCKSIZE	SPA_MINBLOCKSIZE
+#define	SPA_GBH_NBLKPTRS	((SPA_GANGBLOCKSIZE - \
+	sizeof(zio_eck_t)) / sizeof(blkptr_t))
+#define	SPA_GBH_FILLER		((SPA_GANGBLOCKSIZE - \
+	sizeof(zio_eck_t) - \
+	(SPA_GBH_NBLKPTRS * sizeof(blkptr_t))) /\
+	sizeof(uint64_t))
+
+#define	ZIO_GET_IOSIZE(zio)	\
+	(BP_IS_GANG((zio)->io_bp) ? \
+	SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp))
+
+typedef struct zio_gbh {
+	blkptr_t		zg_blkptr[SPA_GBH_NBLKPTRS];
+	uint64_t		zg_filler[SPA_GBH_FILLER];
+	zio_eck_t		zg_tail;
+} zio_gbh_phys_t;
+
+enum zio_checksum {
+	ZIO_CHECKSUM_INHERIT = 0,
+	ZIO_CHECKSUM_ON,
+	ZIO_CHECKSUM_OFF,
+	ZIO_CHECKSUM_LABEL,
+	ZIO_CHECKSUM_GANG_HEADER,
+	ZIO_CHECKSUM_ZILOG,
+	ZIO_CHECKSUM_FLETCHER_2,
+	ZIO_CHECKSUM_FLETCHER_4,
+	ZIO_CHECKSUM_SHA256,
+	ZIO_CHECKSUM_ZILOG2,
+	ZIO_CHECKSUM_FUNCTIONS
+};
+
+#define	ZIO_CHECKSUM_ON_VALUE	ZIO_CHECKSUM_FLETCHER_2
+#define	ZIO_CHECKSUM_DEFAULT	ZIO_CHECKSUM_ON
+
+enum zio_compress {
+	ZIO_COMPRESS_INHERIT = 0,
+	ZIO_COMPRESS_ON,
+	ZIO_COMPRESS_OFF,
+	ZIO_COMPRESS_LZJB,
+	ZIO_COMPRESS_EMPTY,
+	ZIO_COMPRESS_GZIP1,
+	ZIO_COMPRESS_GZIP2,
+	ZIO_COMPRESS_GZIP3,
+	ZIO_COMPRESS_GZIP4,
+	ZIO_COMPRESS_GZIP5,
+	ZIO_COMPRESS_GZIP6,
+	ZIO_COMPRESS_GZIP7,
+	ZIO_COMPRESS_GZIP8,
+	ZIO_COMPRESS_GZIP9,
+	ZIO_COMPRESS_FUNCTIONS
+};
+
+#endif	/* _ZIO_H */
diff --git a/include/zfs/zio_checksum.h b/include/zfs/zio_checksum.h
new file mode 100644
index 0000000..8ade44a
--- /dev/null
+++ b/include/zfs/zio_checksum.h
@@ -0,0 +1,49 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_ZIO_CHECKSUM_H
+#define	_SYS_ZIO_CHECKSUM_H
+
+/*
+ * Signature for checksum functions.
+ */
+typedef void zio_checksum_t(const void *data, uint64_t size,
+			    grub_zfs_endian_t endian, zio_cksum_t *zcp);
+
+/*
+ * Information about each checksum function.
+ */
+typedef struct zio_checksum_info {
+	zio_checksum_t	*ci_func; /* checksum function for each byteorder */
+	int		ci_correctable;	/* number of correctable bits	*/
+	int		ci_eck;		/* uses zio embedded checksum? */
+	char		*ci_name;	/* descriptive name */
+} zio_checksum_info_t;
+
+extern void zio_checksum_SHA256(const void *, uint64_t,
+				 grub_zfs_endian_t endian, zio_cksum_t *);
+extern void fletcher_2(const void *, uint64_t, grub_zfs_endian_t endian,
+			zio_cksum_t *);
+extern void fletcher_4(const void *, uint64_t, grub_zfs_endian_t endian,
+			zio_cksum_t *);
+
+#endif	/* _SYS_ZIO_CHECKSUM_H */
diff --git a/include/zfs_common.h b/include/zfs_common.h
new file mode 100644
index 0000000..969dbf5
--- /dev/null
+++ b/include/zfs_common.h
@@ -0,0 +1,94 @@
+/*
+ * ZFS filesystem implementation in Uboot by
+ * Jorgen Lundman <lundman at lundman.net>
+ *
+ * zfsfs support
+ * made from existing GRUB Sources by Sun, GNU and others.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#ifndef __ZFS_COMMON__
+#define __ZFS_COMMON__
+
+#define SECTOR_SIZE			0x200
+#define SECTOR_BITS			9
+
+#define grub_le_to_cpu16 le16_to_cpu
+#define grub_be_to_cpu16 be16_to_cpu
+#define grub_le_to_cpu32 le32_to_cpu
+#define grub_be_to_cpu32 be32_to_cpu
+#define grub_le_to_cpu64 le64_to_cpu
+#define grub_be_to_cpu64 be64_to_cpu
+
+#define grub_cpu_to_le64 cpu_to_le64
+#define grub_cpu_to_be64 cpu_to_be64
+
+enum zfs_errors {
+	ZFS_ERR_NONE = 0,
+	ZFS_ERR_NOT_IMPLEMENTED_YET = -1,
+	ZFS_ERR_BAD_FS = -2,
+	ZFS_ERR_OUT_OF_MEMORY = -3,
+	ZFS_ERR_FILE_NOT_FOUND = -4,
+	ZFS_ERR_BAD_FILE_TYPE = -5,
+	ZFS_ERR_OUT_OF_RANGE = -6,
+};
+
+struct zfs_filesystem {
+
+	/* Block Device Descriptor */
+	block_dev_desc_t *dev_desc;
+};
+
+
+extern block_dev_desc_t *zfs_dev_desc;
+
+struct device_s {
+	uint64_t part_length;
+};
+typedef struct device_s *device_t;
+
+struct zfs_file {
+	device_t device;
+	uint64_t size;
+	void *data;
+	uint64_t offset;
+};
+
+typedef struct zfs_file *zfs_file_t;
+
+struct zfs_dirhook_info {
+	int dir;
+	int mtimeset;
+	time_t mtime;
+	time_t mtime2;
+};
+
+
+
+
+struct zfs_filesystem *zfsget_fs(void);
+int init_fs(block_dev_desc_t *dev_desc);
+void deinit_fs(block_dev_desc_t *dev_desc);
+int zfs_open(zfs_file_t, const char *filename);
+uint64_t zfs_read(zfs_file_t, char *buf, uint64_t len);
+struct grub_zfs_data *zfs_mount(device_t);
+int zfs_close(zfs_file_t);
+int zfs_ls(device_t dev, const char *path,
+		   int (*hook) (const char *, const struct zfs_dirhook_info *));
+int zfs_devread(int sector, int byte_offset, int byte_len, char *buf);
+int zfs_set_blk_dev(block_dev_desc_t *rbdd, int part);
+void zfs_unmount(struct grub_zfs_data *data);
+int lzjb_decompress(void *, void *, uint32_t, uint32_t);
+#endif
