diff --git a/libxfs/xfs_bmap.c b/libxfs/xfs_bmap.c
index 7927e2712..608ae5b83 100644
--- a/libxfs/xfs_bmap.c
+++ b/libxfs/xfs_bmap.c
@@ -68,13 +68,12 @@ xfs_bmap_compute_maxlevels(
 	 * ATTR2 we have to assume the worst case scenario of a minimum size
 	 * available.
 	 */
-	if (whichfork == XFS_DATA_FORK) {
-		maxleafents = XFS_IFORK_EXTCNT_MAXS32;
+	maxleafents = xfs_iext_max(mp, whichfork);
+	if (whichfork == XFS_DATA_FORK)
 		sz = xfs_bmdr_space_calc(MINDBTPTRS);
-	} else {
-		maxleafents = XFS_IFORK_EXTCNT_MAXS16;
+	else
 		sz = xfs_bmdr_space_calc(MINABTPTRS);
-	}
+
 	maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
 	minleafrecs = mp->m_bmap_dmnr[0];
 	minnoderecs = mp->m_bmap_dmnr[1];
diff --git a/libxfs/xfs_inode_buf.c b/libxfs/xfs_inode_buf.c
index 855cb0b85..056fe252b 100644
--- a/libxfs/xfs_inode_buf.c
+++ b/libxfs/xfs_inode_buf.c
@@ -340,6 +340,7 @@ xfs_dinode_verify_fork(
 	int			whichfork)
 {
 	uint32_t		di_nextents = XFS_DFORK_NEXTENTS(dip, whichfork);
+	xfs_extnum_t		max_extents;
 
 	switch (XFS_DFORK_FORMAT(dip, whichfork)) {
 	case XFS_DINODE_FMT_LOCAL:
@@ -361,12 +362,9 @@ xfs_dinode_verify_fork(
 			return __this_address;
 		break;
 	case XFS_DINODE_FMT_BTREE:
-		if (whichfork == XFS_ATTR_FORK) {
-			if (di_nextents > XFS_IFORK_EXTCNT_MAXS16)
-				return __this_address;
-		} else if (di_nextents > XFS_IFORK_EXTCNT_MAXS32) {
+		max_extents = xfs_iext_max(mp, whichfork);
+		if (di_nextents > max_extents)
 			return __this_address;
-		}
 		break;
 	default:
 		return __this_address;
diff --git a/libxfs/xfs_inode_fork.c b/libxfs/xfs_inode_fork.c
index 36e8bf702..4cd117382 100644
--- a/libxfs/xfs_inode_fork.c
+++ b/libxfs/xfs_inode_fork.c
@@ -727,6 +727,7 @@ xfs_iext_count_may_overflow(
 	int			whichfork,
 	int			nr_to_add)
 {
+	struct xfs_mount	*mp = ip->i_mount;
 	struct xfs_ifork	*ifp = XFS_IFORK_PTR(ip, whichfork);
 	uint64_t		max_exts;
 	uint64_t		nr_exts;
@@ -734,10 +735,9 @@ xfs_iext_count_may_overflow(
 	if (whichfork == XFS_COW_FORK)
 		return 0;
 
-	max_exts = (whichfork == XFS_ATTR_FORK) ?
-		XFS_IFORK_EXTCNT_MAXS16 : XFS_IFORK_EXTCNT_MAXS32;
+	max_exts = xfs_iext_max(mp, whichfork);
 
-	if (XFS_TEST_ERROR(false, ip->i_mount, XFS_ERRTAG_REDUCE_MAX_IEXTENTS))
+	if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_REDUCE_MAX_IEXTENTS))
 		max_exts = 10;
 
 	nr_exts = ifp->if_nextents + nr_to_add;
diff --git a/libxfs/xfs_inode_fork.h b/libxfs/xfs_inode_fork.h
index cf82be263..1eda21636 100644
--- a/libxfs/xfs_inode_fork.h
+++ b/libxfs/xfs_inode_fork.h
@@ -133,6 +133,14 @@ static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)
 	return ifp->if_format;
 }
 
+static inline xfs_extnum_t xfs_iext_max(struct xfs_mount *mp, int whichfork)
+{
+	if (whichfork == XFS_DATA_FORK || whichfork == XFS_COW_FORK)
+		return XFS_IFORK_EXTCNT_MAXS32;
+	else
+		return XFS_IFORK_EXTCNT_MAXS16;
+}
+
 struct xfs_ifork *xfs_ifork_alloc(enum xfs_dinode_fmt format,
 				xfs_extnum_t nextents);
 struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
diff --git a/repair/dinode.c b/repair/dinode.c
index 45c8174cf..a0c5be7c3 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -1808,6 +1808,7 @@ _("bad attr fork offset %d in inode %" PRIu64 ", max=%zu\n"),
  */
 static int
 process_inode_blocks_and_extents(
+	struct xfs_mount *mp,
 	xfs_dinode_t	*dino,
 	xfs_rfsblock_t	nblocks,
 	uint64_t	nextents,
@@ -1831,7 +1832,7 @@ _("bad nblocks %llu for inode %" PRIu64 ", would reset to %" PRIu64 "\n"),
 		}
 	}
 
-	if (nextents > XFS_IFORK_EXTCNT_MAXS32)  {
+	if (nextents > xfs_iext_max(mp, XFS_DATA_FORK)) {
 		do_warn(
 _("too many data fork extents (%" PRIu64 ") in inode %" PRIu64 "\n"),
 			nextents, lino);
@@ -1854,7 +1855,7 @@ _("bad nextents %d for inode %" PRIu64 ", would reset to %" PRIu64 "\n"),
 		}
 	}
 
-	if (anextents > XFS_IFORK_EXTCNT_MAXS16)  {
+	if (anextents > xfs_iext_max(mp, XFS_ATTR_FORK))  {
 		do_warn(
 _("too many attr fork extents (%" PRIu64 ") in inode %" PRIu64 "\n"),
 			anextents, lino);
@@ -2961,7 +2962,7 @@ _("Bad CoW extent size %u on inode %" PRIu64 ", "),
 	/*
 	 * correct space counters if required
 	 */
-	if (process_inode_blocks_and_extents(dino, totblocks + atotblocks,
+	if (process_inode_blocks_and_extents(mp, dino, totblocks + atotblocks,
 			nextents, anextents, lino, dirty) != 0)
 		goto clear_bad_out;
 
