ports/sysutils/grub2/files/patch-grub-2.00-zfs-feature-flag-support

From

	http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/sys-boot/grub/files/grub-2.00-zfs-feature-flag-support-r1.patch

ZFS Feature Flag Support

This is a monolithic version of the following commits:

https://github.com/maxximino/grub2/commit/31a32560fd7948ae5ff5c63105d7c068de7890c8
https://github.com/maxximino/grub2/commit/595d76e8ca0690a963f5533689de8db54ef07e75
https://github.com/maxximino/grub2/commit/58344034e40218b20500fa2936eb4d7d019e1e88
https://github.com/maxximino/grub2/commit/f98cb078abab2c14bb0766b5a0ceb055683dab81
https://github.com/maxximino/grub2/commit/f12806f43a969a654dee7bb89b2e8fd5c42f0e2e

A change was made to account for d8a0feb6 from upstream. This change prevents a
compile time failure that is caused by a change in the callback interface used
by mzap_interate(). Modifications to nvlist_find_value() were reverted to
resolve Gentoo bug #462740. This eliminated the need for the new nvpair_type()
and nvpair_value() functions. They have been removed to silence a compiler
warning and reduce the size of the patch. Further adjustments were made to
silence the following warnings:

/var/tmp/portage/sys-boot/grub-2.00-r2/work/grub-2.00/grub-core/fs/zfs/zfs_lz4.c:77:5:
warning: "__STDC_VERSION__" is not defined [-Wundef]
/var/tmp/portage/sys-boot/grub-2.00-r2/work/grub-2.00/grub-core/fs/zfs/zfs.c:4079:3:
warning: passing argument 4 of 'mzap_iterate' from incompatible pointer type
[enabled by default]

The initial feature flag support patches were written by Delphix while the LZ4
support was written by Saso Kiselkov. The work porting this to GRUB2 was done
by Massimo Maggi, while the adaption to Gentoo's GRUB2 package was done by
Richard Yao.

diff --git a/Makefile.util.def b/Makefile.util.def
index b80187c..1bf3038 100644
--- Makefile.util.def
+++ Makefile.util.def
@@ -95,6 +95,7 @@ library = {
   common = grub-core/fs/zfs/zfs.c;
   common = grub-core/fs/zfs/zfsinfo.c;
   common = grub-core/fs/zfs/zfs_lzjb.c;
+  common = grub-core/fs/zfs/zfs_lz4.c;
   common = grub-core/fs/zfs/zfs_sha256.c;
   common = grub-core/fs/zfs/zfs_fletcher.c;
   common = grub-core/lib/envblk.c;
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 39e77a4..1550b90 100644
--- grub-core/Makefile.core.def
+++ grub-core/Makefile.core.def
@@ -1186,6 +1186,7 @@ module = {
   name = zfs;
   common = fs/zfs/zfs.c;
   common = fs/zfs/zfs_lzjb.c;
+  common = fs/zfs/zfs_lz4.c;
   common = fs/zfs/zfs_sha256.c;
   common = fs/zfs/zfs_fletcher.c;
 };
diff --git a/grub-core/fs/zfs/zfs.c b/grub-core/fs/zfs/zfs.c
index ba0554a..811e3df 100644
--- grub-core/fs/zfs/zfs.c
+++ grub-core/fs/zfs/zfs.c
@@ -2,6 +2,7 @@
  *  GRUB  --  GRand Unified Bootloader
  *  Copyright (C) 1999,2000,2001,2002,2003,2004,2009,2010,2011  Free Software Foundation, Inc.
  *  Copyright 2010  Sun Microsystems, Inc.
+ *  Copyright (c) 2012 by Delphix. All rights reserved.
  *
  *  GRUB is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -153,11 +154,13 @@ ZAP_LEAF_ENTRY(zap_leaf_phys_t *l, int bs, int idx)
 
 
 /*
- * Decompression Entry - lzjb
+ * Decompression Entry - lzjb & lz4
  */
 
 extern grub_err_t lzjb_decompress (void *, void *, grub_size_t, grub_size_t);
 
+extern grub_err_t lz4_decompress (void *, void *, grub_size_t, grub_size_t);
+
 typedef grub_err_t zfs_decomp_func_t (void *s_start, void *d_start,
 				      grub_size_t s_len, grub_size_t d_len);
 typedef struct decomp_entry
@@ -263,6 +266,19 @@ grub_crypto_cipher_handle_t (*grub_zfs_load_key) (const struct grub_zfs_key *key
 						  grub_size_t keysize,
 						  grub_uint64_t salt,
 						  grub_uint64_t algo) = NULL;
+/*
+ * List of pool features that the grub implementation of ZFS supports for
+ * read. Note that features that are only required for write do not need
+ * to be listed here since grub opens pools in read-only mode.
+ */
+static const char *spa_feature_names[] = {
+	"org.illumos:lz4_compress","com.delphix:hole_birth",NULL
+};
+
+static int NESTED_FUNC_ATTR
+check_feature(const char *name, grub_uint64_t val);
+static int
+check_mos_features(dnode_phys_t *mosmdn_phys,grub_zfs_endian_t endian,struct grub_zfs_data* data );
 
 static grub_err_t 
 zlib_decompress (void *s, void *d,
@@ -322,6 +338,7 @@ static decomp_entry_t decomp_table[ZIO_COMPRESS_FUNCTIONS] = {
   {"gzip-8", zlib_decompress},  /* ZIO_COMPRESS_GZIP8 */
   {"gzip-9", zlib_decompress},  /* ZIO_COMPRESS_GZIP9 */
   {"zle", zle_decompress},      /* ZIO_COMPRESS_ZLE   */
+  {"lz4", lz4_decompress},      /* ZIO_COMPRESS_LZ4   */
 };
 
 static grub_err_t zio_read_data (blkptr_t * bp, grub_zfs_endian_t endian,
@@ -482,15 +499,11 @@ uberblock_verify (uberblock_phys_t * ub, grub_uint64_t offset,
 
   if (grub_zfs_to_cpu64 (uber->ub_magic, GRUB_ZFS_LITTLE_ENDIAN)
       == UBERBLOCK_MAGIC
-      && grub_zfs_to_cpu64 (uber->ub_version, GRUB_ZFS_LITTLE_ENDIAN) > 0 
-      && grub_zfs_to_cpu64 (uber->ub_version, GRUB_ZFS_LITTLE_ENDIAN)
-      <= SPA_VERSION)
-    endian = GRUB_ZFS_LITTLE_ENDIAN;
+      && SPA_VERSION_IS_SUPPORTED(grub_zfs_to_cpu64 (uber->ub_version, GRUB_ZFS_LITTLE_ENDIAN)))
+     endian = GRUB_ZFS_LITTLE_ENDIAN;
 
   if (grub_zfs_to_cpu64 (uber->ub_magic, GRUB_ZFS_BIG_ENDIAN) == UBERBLOCK_MAGIC
-      && grub_zfs_to_cpu64 (uber->ub_version, GRUB_ZFS_BIG_ENDIAN) > 0 
-      && grub_zfs_to_cpu64 (uber->ub_version, GRUB_ZFS_BIG_ENDIAN)
-      <= SPA_VERSION)
+      && SPA_VERSION_IS_SUPPORTED(grub_zfs_to_cpu64 (uber->ub_version, GRUB_ZFS_BIG_ENDIAN)))
     endian = GRUB_ZFS_BIG_ENDIAN;
 
   if (endian == GRUB_ZFS_UNKNOWN_ENDIAN)
@@ -764,6 +777,99 @@ fill_vdev_info (struct grub_zfs_data *data,
 }
 
 /*
+ * 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)
+ *
+ */
+
+/*
+ * The nvlist_next_nvpair() function returns a handle to the next nvpair in the
+ * list following nvpair. If nvpair is NULL, the first pair is returned. If
+ * nvpair is the last pair in the nvlist, NULL is returned.
+ */
+static const char *
+nvlist_next_nvpair(const char *nvl, const char *nvpair)
+{
+	const char *nvp;
+	int encode_size;
+	int name_len;
+	if (nvl == NULL)
+		return (NULL);
+
+	if (nvpair == NULL) {
+		/* skip over header, nvl_version and nvl_nvflag */
+		nvpair = nvl + 4 * 3;
+	} else {
+		/* skip to the next nvpair */
+		encode_size = grub_be_to_cpu32 (grub_get_unaligned32(nvpair));
+		nvpair += encode_size;
+	}
+	/* 8 bytes of 0 marks the end of the list */
+	if (*(grub_uint64_t*)nvpair == 0)
+		return (NULL);
+	/*consistency checks*/
+	if (nvpair + 4 * 3 >= nvl + VDEV_PHYS_SIZE)
+	{
+	  grub_dprintf ("zfs", "nvlist overflow\n");
+	  grub_error (GRUB_ERR_BAD_FS, "incorrect nvlist");
+	  return (NULL);
+	}
+	encode_size = grub_be_to_cpu32 (grub_get_unaligned32(nvpair));
+
+	nvp = nvpair + 4*2;
+	name_len = grub_be_to_cpu32 (grub_get_unaligned32 (nvp));
+	nvp += 4;
+
+	nvp = nvp + ((name_len + 3) & ~3); // align 
+	if (nvp + 4 >= nvl + VDEV_PHYS_SIZE                        
+	    || encode_size < 0
+	    || nvp + 4 + encode_size > nvl + VDEV_PHYS_SIZE)       
+	{
+	  grub_dprintf ("zfs", "nvlist overflow\n");
+	  grub_error (GRUB_ERR_BAD_FS, "incorrect nvlist");
+	  return (NULL);
+	}
+	 /* end consistency checks */
+
+	return (nvpair);
+}
+/*
+ * This function returns 0 on success and 1 on failure. On success, a string
+ * containing the name of nvpair is saved in buf.
+ */
+static int
+nvpair_name(const char *nvp, char **buf, int* buflen)
+{
+	int len;
+
+	/* skip over encode/decode size */
+	nvp += 4 * 2;
+
+	len = grub_be_to_cpu32 (grub_get_unaligned32 (nvp));
+	nvp=nvp+4;
+	
+	*buf=(char*)nvp;
+	*buflen=len;
+
+	return (0);
+}
+
+/*
  * Check the disk label information and retrieve needed vdev name-value pairs.
  *
  */
@@ -773,7 +879,7 @@ check_pool_label (struct grub_zfs_data *data,
 		  int *inserted)
 {
   grub_uint64_t pool_state, txg = 0;
-  char *nvlist;
+  char *nvlist,*features;
 #if 0
   char *nv;
 #endif
@@ -837,13 +943,13 @@ check_pool_label (struct grub_zfs_data *data,
     }
   grub_dprintf ("zfs", "check 8 passed\n");
 
-  if (version > SPA_VERSION)
+  if (!SPA_VERSION_IS_SUPPORTED(version))
     {
       grub_free (nvlist);
       return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 			 "too new version %llu > %llu",
 			 (unsigned long long) version,
-			 (unsigned long long) SPA_VERSION);
+			 (unsigned long long) SPA_VERSION_BEFORE_FEATURES);
     }
   grub_dprintf ("zfs", "check 9 passed\n");
 
@@ -893,7 +999,30 @@ check_pool_label (struct grub_zfs_data *data,
     grub_free (nv);
   }
   grub_dprintf ("zfs", "check 10 passed\n");
-
+  if ((features=grub_zfs_nvlist_lookup_nvlist(nvlist, ZPOOL_CONFIG_FEATURES_FOR_READ)))
+  {
+    const char *nvp=NULL;
+    char *name = grub_zalloc(51);
+    char *nameptr;
+    int namelen;
+    while ((nvp = nvlist_next_nvpair(features, nvp)) != NULL)
+    {
+      nvpair_name(nvp, &nameptr,&namelen);
+      if(namelen > 50){namelen=50;}
+      grub_strncpy(name,nameptr,namelen);
+      name[namelen]=0;
+      grub_dprintf("zfs","namelen=%u str=%s\n",namelen,name);
+      if (check_feature(name,1) != 0)
+      {
+	grub_dprintf("zfs","feature missing in check_pool_label:%s\n",name);
+	err= grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET," check_pool_label missing feature '%s' for read",name);
+	grub_free(name);
+	return err;
+      }
+    }
+    grub_free(name);
+  }
+  grub_dprintf ("zfs", "check 12 passed (feature flags)\n");
   grub_free (nvlist);
 
   return GRUB_ERR_NONE;
@@ -3034,27 +3163,6 @@ dnode_get_fullpath (const char *fullpath, struct subvolume *subvol,
   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 (const char *nvlist_in, const char *name,
 		   int valtype, char **val,
@@ -3386,6 +3494,10 @@ zfs_mount (grub_device_t dev)
       return NULL;
     }
 
+    if (ub->ub_version >= SPA_VERSION_FEATURES &&
+	check_mos_features(&((objset_phys_t *) osp)->os_meta_dnode,ub_endian, data) != 0)
+	  return NULL;
+	
   /* Got the MOS. Save it at the memory addr MOS. */
   grub_memmove (&(data->mos.dn), &((objset_phys_t *) osp)->os_meta_dnode,
 		DNODE_SIZE);
@@ -3910,6 +4022,64 @@ grub_zfs_dir (grub_device_t device, const char *path,
   return grub_errno;
 }
 
+static int NESTED_FUNC_ATTR
+check_feature(const char *name, grub_uint64_t val)
+{
+  int i;
+  if(val ==0) return 0;
+  if(*name==0) return 0;
+  for (i = 0; spa_feature_names[i] != NULL; i++) 
+  {
+    if (grub_strcmp(name, spa_feature_names[i]) == 0) 
+        return 0;
+  }
+  grub_printf("missing feature for read '%s'\n",name);
+  return 1;
+}
+
+/*
+ * Checks whether the MOS features that are active are supported by this
+ * (GRUB's) implementation of ZFS.
+ *
+ * Return:
+ *	0: Success.
+ *	errnum: Failure.
+ */
+	    	   
+static int
+check_mos_features(dnode_phys_t *mosmdn_phys,grub_zfs_endian_t endian,struct grub_zfs_data* data )
+{
+  grub_uint64_t objnum;
+  grub_uint8_t errnum = 0;
+  dnode_end_t dn,mosmdn;
+  mzap_phys_t* mzp;
+  grub_zfs_endian_t endianzap;
+  int size;
+  grub_memmove(&(mosmdn.dn),mosmdn_phys,sizeof(dnode_phys_t));
+  mosmdn.endian=endian;
+  if ((errnum = dnode_get(&mosmdn, DMU_POOL_DIRECTORY_OBJECT,
+	  DMU_OT_OBJECT_DIRECTORY, &dn,data)) != 0)
+      return (errnum);
+
+  /*
+   * Find the object number for 'features_for_read' and retrieve its
+   * corresponding dnode. Note that we don't check features_for_write
+   * because GRUB is not opening the pool for write.
+   */
+  if ((errnum = zap_lookup(&dn, DMU_POOL_FEATURES_FOR_READ, &objnum, data,0)) != 0)
+      return (errnum);
+  
+  if ((errnum = dnode_get(&mosmdn, objnum, DMU_OTN_ZAP_METADATA, &dn, data)) != 0)
+      return (errnum);
+
+  if ((errnum = dmu_read(&dn, 0, (void**)&mzp, &endianzap,data)) != 0)
+      return (errnum);
+
+  size = grub_zfs_to_cpu16 (dn.dn.dn_datablkszsec, dn.endian) << SPA_MINBLOCKSHIFT;
+  return (mzap_iterate(mzp,endianzap, size, check_feature));
+}
+
+
 #ifdef GRUB_UTIL
 static grub_err_t
 grub_zfs_embed (grub_device_t device __attribute__ ((unused)),
diff --git a/grub-core/fs/zfs/zfs_lz4.c b/grub-core/fs/zfs/zfs_lz4.c
new file mode 100644
index 0000000..ff85a77
--- /dev/null
+++ grub-core/fs/zfs/zfs_lz4.c
@@ -0,0 +1,318 @@
+/*
+ * LZ4 - Fast LZ compression algorithm
+ * Header File
+ * Copyright (C) 2011-2013, Yann Collet.
+ * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You can contact the author at :
+ * - LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
+ * - LZ4 source repository : http://code.google.com/p/lz4/
+ */
+
+#include <sys/endian.h>
+#include <grub/err.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/types.h>
+
+static int LZ4_uncompress_unknownOutputSize(const char *source, char *dest,
+					    int isize, int maxOutputSize);
+
+/*
+ * CPU Feature Detection
+ */
+
+/* 32 or 64 bits ? */
+#if (defined(__x86_64__) || defined(__x86_64) || defined(__amd64__) || \
+	defined(__amd64) || defined(__ppc64__) || defined(_WIN64) || \
+	defined(__LP64__) || defined(_LP64))
+#define	LZ4_ARCH64	1
+#else
+#define	LZ4_ARCH64	0
+#endif
+
+/*
+ * Little Endian or Big Endian?
+ * Note: overwrite the below #define if you know your architecture endianess.
+ */
+#if BYTE_ORDER == BIG_ENDIAN
+#define	LZ4_BIG_ENDIAN	1
+#else
+	/*
+	 * Little Endian assumed. PDP Endian and other very rare endian format
+	 * are unsupported.
+	 */
+#endif
+
+/*
+ * Compiler Options
+ */
+
+#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L	/* C99 */
+/* "restrict" is a known keyword */
+#else
+/* Disable restrict */
+#ifndef restrict
+#define	restrict /* Only if somebody already didn't take care of that.*/
+#endif
+#endif
+
+#define	GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+
+#define	lz4_bswap16(x) ((unsigned short int) ((((x) >> 8) & 0xffu) \
+	| (((x) & 0xffu) << 8)))
+
+#if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__)
+#define	expect(expr, value)    (__builtin_expect((expr), (value)))
+#else
+#define	expect(expr, value)    (expr)
+#endif
+
+#define	likely(expr)	expect((expr) != 0, 1)
+#define	unlikely(expr)	expect((expr) != 0, 0)
+
+/* Basic types */
+#define	BYTE	grub_uint8_t
+#define	U16	grub_uint16_t
+#define	U32	grub_uint32_t
+#define	S32	grub_int32_t
+#define	U64	grub_uint64_t
+typedef grub_size_t size_t;
+
+typedef struct _U16_S {
+	U16 v;
+} U16_S;
+typedef struct _U32_S {
+	U32 v;
+} U32_S;
+typedef struct _U64_S {
+	U64 v;
+} U64_S;
+
+#define	A64(x)	(((U64_S *)(x))->v)
+#define	A32(x)	(((U32_S *)(x))->v)
+#define	A16(x)	(((U16_S *)(x))->v)
+
+/*
+ * Constants
+ */
+#define	MINMATCH 4
+
+#define	COPYLENGTH 8
+#define	LASTLITERALS 5
+
+#define	ML_BITS 4
+#define	ML_MASK ((1U<<ML_BITS)-1)
+#define	RUN_BITS (8-ML_BITS)
+#define	RUN_MASK ((1U<<RUN_BITS)-1)
+
+/*
+ * Architecture-specific macros
+ */
+#if LZ4_ARCH64
+#define	STEPSIZE 8
+#define	UARCH U64
+#define	AARCH A64
+#define	LZ4_COPYSTEP(s, d)	A64(d) = A64(s); d += 8; s += 8;
+#define	LZ4_COPYPACKET(s, d)	LZ4_COPYSTEP(s, d)
+#define	LZ4_SECURECOPY(s, d, e)	if (d < e) LZ4_WILDCOPY(s, d, e)
+#define	HTYPE U32
+#define	INITBASE(base)		const BYTE* const base = ip
+#else
+#define	STEPSIZE 4
+#define	UARCH U32
+#define	AARCH A32
+#define	LZ4_COPYSTEP(s, d)	A32(d) = A32(s); d += 4; s += 4;
+#define	LZ4_COPYPACKET(s, d)	LZ4_COPYSTEP(s, d); LZ4_COPYSTEP(s, d);
+#define	LZ4_SECURECOPY		LZ4_WILDCOPY
+#define	HTYPE const BYTE*
+#define	INITBASE(base)		const int base = 0
+#endif
+
+#if (defined(LZ4_BIG_ENDIAN) && !defined(BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE))
+#define	LZ4_READ_LITTLEENDIAN_16(d, s, p) \
+	{ U16 v = A16(p); v = lz4_bswap16(v); d = (s) - v; }
+#define	LZ4_WRITE_LITTLEENDIAN_16(p, i) \
+	{ U16 v = (U16)(i); v = lz4_bswap16(v); A16(p) = v; p += 2; }
+#else
+#define	LZ4_READ_LITTLEENDIAN_16(d, s, p) { d = (s) - A16(p); }
+#define	LZ4_WRITE_LITTLEENDIAN_16(p, v)  { A16(p) = v; p += 2; }
+#endif
+
+/* Macros */
+#define	LZ4_WILDCOPY(s, d, e) do { LZ4_COPYPACKET(s, d) } while (d < e);
+
+/* Decompression functions */
+grub_err_t
+lz4_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len);
+
+grub_err_t
+lz4_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len)
+{
+	const BYTE *src = s_start;
+	U32 bufsiz = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) |
+	    src[3];
+
+	/* invalid compressed buffer size encoded at start */
+	if (bufsiz + 4 > s_len)
+		return grub_error(GRUB_ERR_BAD_FS,"lz4 decompression failed.");
+
+	/*
+	 * Returns 0 on success (decompression function returned non-negative)
+	 * and appropriate error on failure (decompression function returned negative).
+	 */
+	return (LZ4_uncompress_unknownOutputSize((char*)s_start + 4, d_start, bufsiz,
+	    d_len) < 0)?grub_error(GRUB_ERR_BAD_FS,"lz4 decompression failed."):0;
+}
+
+static int
+LZ4_uncompress_unknownOutputSize(const char *source,
+    char *dest, int isize, int maxOutputSize)
+{
+	/* Local Variables */
+	const BYTE *restrict ip = (const BYTE *) source;
+	const BYTE *const iend = ip + isize;
+	const BYTE *restrict ref;
+
+	BYTE *restrict op = (BYTE *) dest;
+	BYTE *const oend = op + maxOutputSize;
+	BYTE *cpy;
+
+	size_t dec[] = { 0, 3, 2, 3, 0, 0, 0, 0 };
+
+	/* Main Loop */
+	while (ip < iend) {
+		BYTE token;
+		int length;
+
+		/* get runlength */
+		token = *ip++;
+		if ((length = (token >> ML_BITS)) == RUN_MASK) {
+			int s = 255;
+			while ((ip < iend) && (s == 255)) {
+				s = *ip++;
+				length += s;
+			}
+		}
+		/* copy literals */
+		cpy = op + length;
+		if ((cpy > oend - COPYLENGTH) ||
+		    (ip + length > iend - COPYLENGTH)) {
+			if (cpy > oend)
+				/*
+				 * Error: request to write beyond destination
+				 * buffer.
+				 */
+				goto _output_error;
+			if (ip + length > iend)
+				/*
+				 * Error : request to read beyond source
+				 * buffer.
+				 */
+				goto _output_error;
+			grub_memcpy(op, ip, length);
+			op += length;
+			ip += length;
+			if (ip < iend)
+				/* Error : LZ4 format violation */
+				goto _output_error;
+			/* Necessarily EOF, due to parsing restrictions. */
+			break;
+		}
+		LZ4_WILDCOPY(ip, op, cpy);
+		ip -= (op - cpy);
+		op = cpy;
+
+		/* get offset */
+		LZ4_READ_LITTLEENDIAN_16(ref, cpy, ip);
+		ip += 2;
+		if (ref < (BYTE * const) dest)
+			/*
+			 * Error: offset creates reference outside of
+			 * destination buffer.
+			 */
+			goto _output_error;
+
+		/* get matchlength */
+		if ((length = (token & ML_MASK)) == ML_MASK) {
+			while (ip < iend) {
+				int s = *ip++;
+				length += s;
+				if (s == 255)
+					continue;
+				break;
+			}
+		}
+		/* copy repeated sequence */
+		if unlikely(op - ref < STEPSIZE) {
+#if LZ4_ARCH64
+			size_t dec2table[] = { 0, 0, 0, -1, 0, 1, 2, 3 };
+			size_t dec2 = dec2table[op - ref];
+#else
+			const int dec2 = 0;
+#endif
+			*op++ = *ref++;
+			*op++ = *ref++;
+			*op++ = *ref++;
+			*op++ = *ref++;
+			ref -= dec[op - ref];
+			A32(op) = A32(ref);
+			op += STEPSIZE - 4;
+			ref -= dec2;
+		} else {
+			LZ4_COPYSTEP(ref, op);
+		}
+		cpy = op + length - (STEPSIZE - 4);
+		if (cpy > oend - COPYLENGTH) {
+			if (cpy > oend)
+				/*
+				 * Error: request to write outside of
+				 * destination buffer.
+				 */
+				goto _output_error;
+			LZ4_SECURECOPY(ref, op, (oend - COPYLENGTH));
+			while (op < cpy)
+				*op++ = *ref++;
+			op = cpy;
+			if (op == oend)
+				/*
+				 * Check EOF (should never happen, since last
+				 * 5 bytes are supposed to be literals).
+				 */
+				break;
+			continue;
+		}
+		LZ4_SECURECOPY(ref, op, cpy);
+		op = cpy;	/* correction */
+	}
+
+	/* end of decoding */
+	return (int)(((char *)op) - dest);
+
+	/* write overflow error detected */
+	_output_error:
+	return (int)(-(((char *)ip) - source));
+}
diff --git a/grub-core/fs/zfs/zfsinfo.c b/grub-core/fs/zfs/zfsinfo.c
index fdb587a..c96bf21 100644
--- grub-core/fs/zfs/zfsinfo.c
+++ grub-core/fs/zfs/zfsinfo.c
@@ -132,21 +132,31 @@ print_vdev_info (char *nvlist, int tab)
       grub_free (path);
       return GRUB_ERR_NONE;
     }
+  char is_mirror=(grub_strcmp(type,VDEV_TYPE_MIRROR) == 0);
+  char is_raidz=(grub_strcmp(type,VDEV_TYPE_RAIDZ) == 0);
 
-  if (grub_strcmp (type, VDEV_TYPE_MIRROR) == 0)
+  if (is_mirror || is_raidz)
     {
       int nelm, i;
 
       nelm = grub_zfs_nvlist_lookup_nvlist_array_get_nelm
 	(nvlist, ZPOOL_CONFIG_CHILDREN);
 
+      if(is_mirror){
+	 grub_puts_ (N_("This VDEV is a mirror"));
+      }
+      else if(is_raidz){
+	 grub_uint64_t parity;
+	 grub_zfs_nvlist_lookup_uint64(nvlist,"nparity",&parity);
+	 grub_printf_ (N_("This VDEV is a RAIDZ%llu\n"),(unsigned long long)parity);
+      }
       print_tabs (tab);
       if (nelm <= 0)
 	{
-	  grub_puts_ (N_("Incorrect mirror"));
+	  grub_puts_ (N_("Incorrect VDEV"));
 	  return GRUB_ERR_NONE;
 	}
-      grub_printf_ (N_("Mirror with %d children\n"), nelm);
+      grub_printf_ (N_("VDEV with %d children\n"), nelm);
       print_state (nvlist, tab);
       for (i = 0; i < nelm; i++)
 	{
@@ -162,14 +172,14 @@ print_vdev_info (char *nvlist, int tab)
 		 total element number. And the number itself is fine,
 		 only the element isn't.
 	      */
-	      grub_printf_ (N_("Mirror element number %d isn't correct\n"), i);
+	      grub_printf_ (N_("VDEV element number %d isn't correct\n"), i);
 	      continue;
 	    }
 
 	  /* TRANSLATORS: it's the element carying the number %d, not
 	     total element number. This is used in enumeration
 	     "Element number 1", "Element number 2", ... */
-	  grub_printf_ (N_("Mirror element number %d:\n"), i);
+	  grub_printf_ (N_("VDEV element number %d:\n"), i);
 	  print_vdev_info (child, tab + 1);
 
 	  grub_free (child);
diff --git a/include/grub/zfs/dmu.h b/include/grub/zfs/dmu.h
index 8fc6dc5..4ad616c 100644
--- include/grub/zfs/dmu.h
+++ include/grub/zfs/dmu.h
@@ -22,6 +22,39 @@
 
 #ifndef	_SYS_DMU_H
 #define	_SYS_DMU_H
+#define	B_FALSE	0
+#define	B_TRUE	1
+
+#define	DMU_OT_NEWTYPE 0x80
+#define	DMU_OT_METADATA 0x40
+#define	DMU_OT_BYTESWAP_MASK 0x3f
+
+#define	DMU_OT(byteswap, metadata) \
+	(DMU_OT_NEWTYPE | \
+	((metadata) ? DMU_OT_METADATA : 0) | \
+	((byteswap) & DMU_OT_BYTESWAP_MASK))
+
+#define	DMU_OT_IS_VALID(ot) (((ot) & DMU_OT_NEWTYPE) ? \
+	((ot) & DMU_OT_BYTESWAP_MASK) < DMU_BSWAP_NUMFUNCS : \
+	(ot) < DMU_OT_NUMTYPES)
+
+#define	DMU_OT_IS_METADATA(ot) (((ot) & DMU_OT_NEWTYPE) ? \
+	((ot) & DMU_OT_METADATA) : \
+	dmu_ot[(ot)].ot_metadata)
+
+typedef enum dmu_object_byteswap {
+	DMU_BSWAP_UINT8,
+	DMU_BSWAP_UINT16,
+	DMU_BSWAP_UINT32,
+	DMU_BSWAP_UINT64,
+	DMU_BSWAP_ZAP,
+	DMU_BSWAP_DNODE,
+	DMU_BSWAP_OBJSET,
+	DMU_BSWAP_ZNODE,
+	DMU_BSWAP_OLDACL,
+	DMU_BSWAP_ACL,
+	DMU_BSWAP_NUMFUNCS
+} dmu_object_byteswap_t;
 
 /*
  * This file describes the interface that the DMU provides for its
@@ -89,7 +122,17 @@ typedef enum dmu_object_type {
 	DMU_OT_SA_ATTR_REGISTRATION,	/* ZAP */
 	DMU_OT_SA_ATTR_LAYOUTS,		/* ZAP */
 	DMU_OT_DSL_KEYCHAIN = 54,
-	DMU_OT_NUMTYPES
+	DMU_OT_NUMTYPES,
+	DMU_OTN_UINT8_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE),
+	DMU_OTN_UINT8_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE),
+	DMU_OTN_UINT16_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE),
+	DMU_OTN_UINT16_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE),
+	DMU_OTN_UINT32_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE),
+	DMU_OTN_UINT32_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE),
+	DMU_OTN_UINT64_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE),
+	DMU_OTN_UINT64_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE),
+	DMU_OTN_ZAP_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE),
+	DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE),
 } dmu_object_type_t;
 
 typedef enum dmu_objset_type {
@@ -116,5 +159,6 @@ typedef enum dmu_objset_type {
 #define	DMU_POOL_HISTORY		"history"
 #define	DMU_POOL_PROPS			"pool_props"
 #define	DMU_POOL_L2CACHE		"l2cache"
+#define	DMU_POOL_FEATURES_FOR_READ	"features_for_read"
 
 #endif	/* _SYS_DMU_H */
diff --git a/include/grub/zfs/zfs.h b/include/grub/zfs/zfs.h
index e326c8b..761ade7 100644
--- include/grub/zfs/zfs.h
+++ include/grub/zfs/zfs.h
@@ -36,8 +36,13 @@ typedef enum grub_zfs_endian
 /*
  * On-disk version number.
  */
-#define	SPA_VERSION			33ULL
-
+#define	SPA_VERSION_INITIAL		1ULL
+#define	SPA_VERSION_BEFORE_FEATURES	33ULL
+#define	SPA_VERSION			5000ULL
+#define	SPA_VERSION_FEATURES		5000ULL
+#define	SPA_VERSION_IS_SUPPORTED(v) \
+	(((v) >= SPA_VERSION_INITIAL && (v) <= SPA_VERSION_BEFORE_FEATURES) || \
+	((v) >= SPA_VERSION_FEATURES && (v) <= SPA_VERSION))
 /*
  * The following are configuration names used in the nvlist describing a pool's
  * configuration.
@@ -76,6 +81,7 @@ typedef enum grub_zfs_endian
 #define	ZPOOL_CONFIG_DDT_HISTOGRAM	"ddt_histogram"
 #define	ZPOOL_CONFIG_DDT_OBJ_STATS	"ddt_object_stats"
 #define	ZPOOL_CONFIG_DDT_STATS		"ddt_stats"
+#define	ZPOOL_CONFIG_FEATURES_FOR_READ	"features_for_read"
 /*
  * 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
diff --git a/include/grub/zfs/zio.h b/include/grub/zfs/zio.h
index b1c46da..8fad2cc 100644
--- include/grub/zfs/zio.h
+++ include/grub/zfs/zio.h
@@ -88,6 +88,7 @@ enum zio_compress {
 	ZIO_COMPRESS_GZIP8,
 	ZIO_COMPRESS_GZIP9,
 	ZIO_COMPRESS_ZLE,
+	ZIO_COMPRESS_LZ4,
 	ZIO_COMPRESS_FUNCTIONS
 };
 
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 987b37a..c55d9e3 100644
--- po/POTFILES.in
+++ po/POTFILES.in
@@ -173,6 +173,7 @@
 ./grub-core/fs/zfs/zfs_fletcher.c
 ./grub-core/fs/zfs/zfsinfo.c
 ./grub-core/fs/zfs/zfs_lzjb.c
+./grub-core/fs/zfs/zfs_lz4.c
 ./grub-core/fs/zfs/zfs_sha256.c
 ./grub-core/gdb/cstub.c
 ./grub-core/gdb/gdb.c