diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 86285071700b..5303b3db3c98 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -2040,6 +2040,14 @@ xlog_recovery_validate_buf_type(
 		}
 		bp->b_ops = &xfs_attr3_rmt_buf_ops;
 		break;
+	case XFS_BLFT_SB_BUF:
+		if (magic32 != XFS_SB_MAGIC) {
+			xfs_warn(mp, "Bad SB block magic!");
+			ASSERT(0);
+			break;
+		}
+		bp->b_ops = &xfs_sb_buf_ops;
+		break;
 	default:
 		xfs_warn(mp, "Unknown buffer type %d!",
 			 xfs_blft_from_flags(buf_f));
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 3806088a8f77..140136cf2dc0 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -43,6 +43,8 @@
 #include "xfs_utils.h"
 #include "xfs_trace.h"
 #include "xfs_icache.h"
+#include "xfs_cksum.h"
+#include "xfs_buf_item.h"
 
 
 #ifdef HAVE_PERCPU_SB
@@ -109,6 +111,12 @@ static const struct {
     { offsetof(xfs_sb_t, sb_logsunit),	 0 },
     { offsetof(xfs_sb_t, sb_features2),	 0 },
     { offsetof(xfs_sb_t, sb_bad_features2), 0 },
+    { offsetof(xfs_sb_t, sb_features_compat), 0 },
+    { offsetof(xfs_sb_t, sb_features_ro_compat), 0 },
+    { offsetof(xfs_sb_t, sb_features_incompat), 0 },
+    { offsetof(xfs_sb_t, sb_crc),	 0 },
+    { offsetof(xfs_sb_t, sb_pquotino),	 0 },
+    { offsetof(xfs_sb_t, sb_lsn),	 0 },
     { sizeof(xfs_sb_t),			 0 }
 };
 
@@ -319,11 +327,23 @@ xfs_mount_validate_sb(
 		return XFS_ERROR(EWRONGFS);
 	}
 
+
 	if (!xfs_sb_good_version(sbp)) {
 		xfs_warn(mp, "bad version");
 		return XFS_ERROR(EWRONGFS);
 	}
 
+	/*
+	 * Do not allow Version 5 superblocks to mount right now, even though
+	 * support is in place. We need to implement the proper feature masks
+	 * first.
+	 */
+	if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) {
+		xfs_alert(mp,
+	"Version 5 superblock detected. Experimental support not yet enabled!");
+		return XFS_ERROR(EINVAL);
+	}
+
 	if (unlikely(
 	    sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
 		xfs_warn(mp,
@@ -557,6 +577,11 @@ xfs_sb_from_disk(
 	to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
 	to->sb_features2 = be32_to_cpu(from->sb_features2);
 	to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
+	to->sb_features_compat = be32_to_cpu(from->sb_features_compat);
+	to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat);
+	to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat);
+	to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
+	to->sb_lsn = be64_to_cpu(from->sb_lsn);
 }
 
 /*
@@ -612,13 +637,12 @@ xfs_sb_to_disk(
 	}
 }
 
-static void
+static int
 xfs_sb_verify(
 	struct xfs_buf	*bp)
 {
 	struct xfs_mount *mp = bp->b_target->bt_mount;
 	struct xfs_sb	sb;
-	int		error;
 
 	xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp));
 
@@ -626,16 +650,46 @@ xfs_sb_verify(
 	 * Only check the in progress field for the primary superblock as
 	 * mkfs.xfs doesn't clear it from secondary superblocks.
 	 */
-	error = xfs_mount_validate_sb(mp, &sb, bp->b_bn == XFS_SB_DADDR);
-	if (error)
-		xfs_buf_ioerror(bp, error);
+	return xfs_mount_validate_sb(mp, &sb, bp->b_bn == XFS_SB_DADDR);
 }
 
+/*
+ * If the superblock has the CRC feature bit set or the CRC field is non-null,
+ * check that the CRC is valid.  We check the CRC field is non-null because a
+ * single bit error could clear the feature bit and unused parts of the
+ * superblock are supposed to be zero. Hence a non-null crc field indicates that
+ * we've potentially lost a feature bit and we should check it anyway.
+ */
 static void
 xfs_sb_read_verify(
 	struct xfs_buf	*bp)
 {
-	xfs_sb_verify(bp);
+	struct xfs_mount *mp = bp->b_target->bt_mount;
+	struct xfs_dsb	*dsb = XFS_BUF_TO_SBP(bp);
+	int		error;
+
+	/*
+	 * open code the version check to avoid needing to convert the entire
+	 * superblock from disk order just to check the version number
+	 */
+	if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) &&
+	    (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) ==
+						XFS_SB_VERSION_5) ||
+	     dsb->sb_crc != 0)) {
+
+		if (!xfs_verify_cksum(bp->b_addr, be16_to_cpu(dsb->sb_sectsize),
+				      offsetof(struct xfs_sb, sb_crc))) {
+			error = EFSCORRUPTED;
+			goto out_error;
+		}
+	}
+	error = xfs_sb_verify(bp);
+
+out_error:
+	if (error) {
+		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
+		xfs_buf_ioerror(bp, error);
+	}
 }
 
 /*
@@ -648,11 +702,10 @@ static void
 xfs_sb_quiet_read_verify(
 	struct xfs_buf	*bp)
 {
-	struct xfs_sb	sb;
+	struct xfs_dsb	*dsb = XFS_BUF_TO_SBP(bp);
 
-	xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp));
 
-	if (sb.sb_magicnum == XFS_SB_MAGIC) {
+	if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) {
 		/* XFS filesystem, verify noisily! */
 		xfs_sb_read_verify(bp);
 		return;
@@ -663,9 +716,27 @@ xfs_sb_quiet_read_verify(
 
 static void
 xfs_sb_write_verify(
-	struct xfs_buf	*bp)
+	struct xfs_buf		*bp)
 {
-	xfs_sb_verify(bp);
+	struct xfs_mount	*mp = bp->b_target->bt_mount;
+	struct xfs_buf_log_item	*bip = bp->b_fspriv;
+	int			error;
+
+	error = xfs_sb_verify(bp);
+	if (error) {
+		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
+		xfs_buf_ioerror(bp, error);
+		return;
+	}
+
+	if (!xfs_sb_version_hascrc(&mp->m_sb))
+		return;
+
+	if (bip)
+		XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn);
+
+	xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),
+			 offsetof(struct xfs_sb, sb_crc));
 }
 
 const struct xfs_buf_ops xfs_sb_buf_ops = {
@@ -687,7 +758,8 @@ int
 xfs_readsb(xfs_mount_t *mp, int flags)
 {
 	unsigned int	sector_size;
-	xfs_buf_t	*bp;
+	struct xfs_buf	*bp;
+	struct xfs_sb	*sbp = &mp->m_sb;
 	int		error;
 	int		loud = !(flags & XFS_MFSI_QUIET);
 
@@ -726,10 +798,10 @@ reread:
 	/*
 	 * We must be able to do sector-sized and sector-aligned IO.
 	 */
-	if (sector_size > mp->m_sb.sb_sectsize) {
+	if (sector_size > sbp->sb_sectsize) {
 		if (loud)
 			xfs_warn(mp, "device supports %u byte sectors (not %u)",
-				sector_size, mp->m_sb.sb_sectsize);
+				sector_size, sbp->sb_sectsize);
 		error = ENOSYS;
 		goto release_buf;
 	}
@@ -738,15 +810,18 @@ reread:
 	 * If device sector size is smaller than the superblock size,
 	 * re-read the superblock so the buffer is correctly sized.
 	 */
-	if (sector_size < mp->m_sb.sb_sectsize) {
+	if (sector_size < sbp->sb_sectsize) {
 		xfs_buf_relse(bp);
-		sector_size = mp->m_sb.sb_sectsize;
+		sector_size = sbp->sb_sectsize;
 		goto reread;
 	}
 
 	/* Initialize per-cpu counters */
 	xfs_icsb_reinit_counters(mp);
 
+	/* no need to be quiet anymore, so reset the buf ops */
+	bp->b_ops = &xfs_sb_buf_ops;
+
 	mp->m_sb_bp = bp;
 	xfs_buf_unlock(bp);
 	return 0;
@@ -1633,6 +1708,7 @@ xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
 	ASSERT((1LL << f) & XFS_SB_MOD_BITS);
 	first = xfs_sb_info[f].offset;
 
+	xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
 	xfs_trans_log_buf(tp, bp, first, last);
 }
 
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 687c1711b6eb..b004cecdfb04 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -391,6 +391,7 @@ extern void	xfs_set_low_space_thresholds(struct xfs_mount *);
 
 #endif	/* __KERNEL__ */
 
+extern void	xfs_sb_calc_crc(struct xfs_buf	*);
 extern void	xfs_mod_sb(struct xfs_trans *, __int64_t);
 extern int	xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t,
 					xfs_agnumber_t *);
diff --git a/fs/xfs/xfs_sb.h b/fs/xfs/xfs_sb.h
index a05b45175fb0..457fefae5683 100644
--- a/fs/xfs/xfs_sb.h
+++ b/fs/xfs/xfs_sb.h
@@ -32,6 +32,7 @@ struct xfs_mount;
 #define	XFS_SB_VERSION_2	2		/* 6.2 - attributes */
 #define	XFS_SB_VERSION_3	3		/* 6.2 - new inode version */
 #define	XFS_SB_VERSION_4	4		/* 6.2+ - bitmask version */
+#define	XFS_SB_VERSION_5	5		/* CRC enabled filesystem */
 #define	XFS_SB_VERSION_NUMBITS		0x000f
 #define	XFS_SB_VERSION_ALLFBITS		0xfff0
 #define	XFS_SB_VERSION_SASHFBITS	0xf000
@@ -161,6 +162,18 @@ typedef struct xfs_sb {
 	 */
 	__uint32_t	sb_bad_features2;
 
+	/* version 5 superblock fields start here */
+
+	/* feature masks */
+	__uint32_t	sb_features_compat;
+	__uint32_t	sb_features_ro_compat;
+	__uint32_t	sb_features_incompat;
+
+	__uint32_t	sb_crc;		/* superblock crc */
+
+	xfs_ino_t	sb_pquotino;	/* project quota inode */
+	xfs_lsn_t	sb_lsn;		/* last write sequence */
+
 	/* must be padded to 64 bit alignment */
 } xfs_sb_t;
 
@@ -229,7 +242,19 @@ typedef struct xfs_dsb {
 	 * for features2 bits. Easiest just to mark it bad and not use
 	 * it for anything else.
 	 */
-	__be32	sb_bad_features2;
+	__be32		sb_bad_features2;
+
+	/* version 5 superblock fields start here */
+
+	/* feature masks */
+	__be32		sb_features_compat;
+	__be32		sb_features_ro_compat;
+	__be32		sb_features_incompat;
+
+	__le32		sb_crc;		/* superblock crc */
+
+	__be64		sb_pquotino;	/* project quota inode */
+	__be64		sb_lsn;		/* last write sequence */
 
 	/* must be padded to 64 bit alignment */
 } xfs_dsb_t;
@@ -250,7 +275,9 @@ typedef enum {
 	XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
 	XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
 	XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
-	XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2,
+	XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2, XFS_SBS_FEATURES_COMPAT,
+	XFS_SBS_FEATURES_RO_COMPAT, XFS_SBS_FEATURES_INCOMPAT, XFS_SBS_CRC,
+	XFS_SBS_PQUOTINO, XFS_SBS_LSN,
 	XFS_SBS_FIELDCOUNT
 } xfs_sb_field_t;
 
@@ -276,6 +303,11 @@ typedef enum {
 #define XFS_SB_FDBLOCKS		XFS_SB_MVAL(FDBLOCKS)
 #define XFS_SB_FEATURES2	XFS_SB_MVAL(FEATURES2)
 #define XFS_SB_BAD_FEATURES2	XFS_SB_MVAL(BAD_FEATURES2)
+#define XFS_SB_FEATURES_COMPAT	XFS_SB_MVAL(FEATURES_COMPAT)
+#define XFS_SB_FEATURES_RO_COMPAT XFS_SB_MVAL(FEATURES_RO_COMPAT)
+#define XFS_SB_FEATURES_INCOMPAT XFS_SB_MVAL(FEATURES_INCOMPAT)
+#define XFS_SB_CRC		XFS_SB_MVAL(CRC)
+#define XFS_SB_PQUOTINO		XFS_SB_MVAL(PQUOTINO)
 #define	XFS_SB_NUM_BITS		((int)XFS_SBS_FIELDCOUNT)
 #define	XFS_SB_ALL_BITS		((1LL << XFS_SB_NUM_BITS) - 1)
 #define	XFS_SB_MOD_BITS		\
@@ -283,7 +315,8 @@ typedef enum {
 	 XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
 	 XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
 	 XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
-	 XFS_SB_BAD_FEATURES2)
+	 XFS_SB_BAD_FEATURES2 | XFS_SB_FEATURES_COMPAT | \
+	 XFS_SB_FEATURES_RO_COMPAT | XFS_SB_FEATURES_INCOMPAT | XFS_SB_PQUOTINO)
 
 
 /*
@@ -325,6 +358,8 @@ static inline int xfs_sb_good_version(xfs_sb_t *sbp)
 
 		return 1;
 	}
+	if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
+		return 1;
 
 	return 0;
 }
@@ -365,7 +400,7 @@ static inline int xfs_sb_version_hasattr(xfs_sb_t *sbp)
 {
 	return sbp->sb_versionnum == XFS_SB_VERSION_2 ||
 		sbp->sb_versionnum == XFS_SB_VERSION_3 ||
-		(XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 		 (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT));
 }
 
@@ -373,7 +408,7 @@ static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
 {
 	if (sbp->sb_versionnum == XFS_SB_VERSION_1)
 		sbp->sb_versionnum = XFS_SB_VERSION_2;
-	else if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
+	else if (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4)
 		sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
 	else
 		sbp->sb_versionnum = XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
@@ -382,7 +417,7 @@ static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
 static inline int xfs_sb_version_hasnlink(xfs_sb_t *sbp)
 {
 	return sbp->sb_versionnum == XFS_SB_VERSION_3 ||
-		 (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		 (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 		  (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT));
 }
 
@@ -396,13 +431,13 @@ static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
 
 static inline int xfs_sb_version_hasquota(xfs_sb_t *sbp)
 {
-	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+	return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 		(sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
 }
 
 static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
 {
-	if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
+	if (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4)
 		sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
 	else
 		sbp->sb_versionnum = xfs_sb_version_tonew(sbp->sb_versionnum) |
@@ -411,13 +446,14 @@ static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
 
 static inline int xfs_sb_version_hasalign(xfs_sb_t *sbp)
 {
-	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
-		(sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT);
+	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
+	       (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
 }
 
 static inline int xfs_sb_version_hasdalign(xfs_sb_t *sbp)
 {
-	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+	return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 		(sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
 }
 
@@ -429,38 +465,42 @@ static inline int xfs_sb_version_hasshared(xfs_sb_t *sbp)
 
 static inline int xfs_sb_version_hasdirv2(xfs_sb_t *sbp)
 {
-	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
-		(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
+	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
+	       (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT));
 }
 
 static inline int xfs_sb_version_haslogv2(xfs_sb_t *sbp)
 {
-	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
-		(sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
+	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
+	       (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT));
 }
 
 static inline int xfs_sb_version_hasextflgbit(xfs_sb_t *sbp)
 {
-	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
-		(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
+	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
+	       (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT));
 }
 
 static inline int xfs_sb_version_hassector(xfs_sb_t *sbp)
 {
-	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+	return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 		(sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
 }
 
 static inline int xfs_sb_version_hasasciici(xfs_sb_t *sbp)
 {
-	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+	return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 		(sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
 }
 
 static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
 {
-	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
-		(sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
+	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
+	       (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT));
 }
 
 /*
@@ -475,14 +515,16 @@ static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
 
 static inline int xfs_sb_version_haslazysbcount(xfs_sb_t *sbp)
 {
-	return xfs_sb_version_hasmorebits(sbp) &&
-		(sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT);
+	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
+	       (xfs_sb_version_hasmorebits(sbp) &&
+		(sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
 }
 
 static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
 {
-	return xfs_sb_version_hasmorebits(sbp) &&
-		(sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT);
+	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
+	       (xfs_sb_version_hasmorebits(sbp) &&
+		(sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
 }
 
 static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
@@ -500,14 +542,14 @@ static inline void xfs_sb_version_removeattr2(xfs_sb_t *sbp)
 
 static inline int xfs_sb_version_hasprojid32bit(xfs_sb_t *sbp)
 {
-	return xfs_sb_version_hasmorebits(sbp) &&
-		(sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT);
+	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
+	       (xfs_sb_version_hasmorebits(sbp) &&
+		(sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
 }
 
 static inline int xfs_sb_version_hascrc(xfs_sb_t *sbp)
 {
-	return (xfs_sb_version_hasmorebits(sbp) &&
-		(sbp->sb_features2 & XFS_SB_VERSION2_CRCBIT));
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
 }
 
 /*