Illumos #3208 cross-endian incorrect user/group accounting

3208 moving zpool cross-endian results in incorrect user/group
accounting

Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <chris.siden@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

References:
  illumos/illumos-gate@e828a46
  illumos changeset: 13835:eea81edc4f14
  https://www.illumos.org/issues/3208

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #627
Closes #1136

Author: ahrens

include/sys/sa_impl.h

@@ -20,6 +20,7 @@
  */
 /*
  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012 by Delphix. All rights reserved.
  */
 
 #ifndef	_SYS_SA_IMPL_H
@@ -181,7 +182,7 @@ typedef struct sa_hdr_phys {
  */
 
 #define	SA_HDR_LAYOUT_NUM(hdr) BF32_GET(hdr->sa_layout_info, 0, 10)
-#define	SA_HDR_SIZE(hdr) BF32_GET_SB(hdr->sa_layout_info, 10, 16, 3, 0)
+#define	SA_HDR_SIZE(hdr) BF32_GET_SB(hdr->sa_layout_info, 10, 6, 3, 0)
 #define	SA_HDR_LAYOUT_INFO_ENCODE(x, num, size) \
 { \
 	BF32_SET_SB(x, 10, 6, 3, 0, size); \

module/zfs/zfs_vfsops.c

@@ -49,6 +49,7 @@
 #include <sys/spa.h>
 #include <sys/zap.h>
 #include <sys/sa.h>
+#include <sys/sa_impl.h>
 #include <sys/varargs.h>
 #include <sys/policy.h>
 #include <sys/atomic.h>
@@ -63,7 +64,6 @@
 #include <sys/dnlc.h>
 #include <sys/dmu_objset.h>
 #include <sys/spa_boot.h>
-#include <sys/sa.h>
 #include <sys/zpl.h>
 #include "zfs_comutil.h"
 
@@ -300,7 +300,6 @@ static int
 zfs_space_delta_cb(dmu_object_type_t bonustype, void *data,
     uint64_t *userp, uint64_t *groupp)
 {
-	znode_phys_t *znp = data;
 	int error = 0;
 
 	/*
@@ -319,27 +318,44 @@ zfs_space_delta_cb(dmu_object_type_t bonustype, void *data,
 		return (EEXIST);
 
 	if (bonustype == DMU_OT_ZNODE) {
+		znode_phys_t *znp = data;
 		*userp = znp->zp_uid;
 		*groupp = znp->zp_gid;
 	} else {
 		int hdrsize;
+		sa_hdr_phys_t *sap = data;
+		sa_hdr_phys_t sa = *sap;
+		boolean_t swap = B_FALSE;
 
 		ASSERT(bonustype == DMU_OT_SA);
-		hdrsize = sa_hdrsize(data);
 
-		if (hdrsize != 0) {
-			*userp = *((uint64_t *)((uintptr_t)data + hdrsize +
-			    SA_UID_OFFSET));
-			*groupp = *((uint64_t *)((uintptr_t)data + hdrsize +
-			    SA_GID_OFFSET));
-		} else {
+		if (sa.sa_magic == 0) {
 			/*
 			 * This should only happen for newly created
 			 * files that haven't had the znode data filled
 			 * in yet.
 			 */
 			*userp = 0;
 			*groupp = 0;
+			return (0);
+		}
+		if (sa.sa_magic == BSWAP_32(SA_MAGIC)) {
+			sa.sa_magic = SA_MAGIC;
+			sa.sa_layout_info = BSWAP_16(sa.sa_layout_info);
+			swap = B_TRUE;
+		} else {
+			VERIFY3U(sa.sa_magic, ==, SA_MAGIC);
+		}
+
+		hdrsize = sa_hdrsize(&sa);
+		VERIFY3U(hdrsize, >=, sizeof (sa_hdr_phys_t));
+		*userp = *((uint64_t *)((uintptr_t)data + hdrsize +
+		    SA_UID_OFFSET));
+		*groupp = *((uint64_t *)((uintptr_t)data + hdrsize +
+		    SA_GID_OFFSET));
+		if (swap) {
+			*userp = BSWAP_64(*userp);
+			*groupp = BSWAP_64(*groupp);
 		}
 	}
 	return (error);