Index: xfsprogs-4.19.0/mkfs/xfs_mkfs.c
===================================================================
--- xfsprogs-4.19.0.orig/mkfs/xfs_mkfs.c
+++ xfsprogs-4.19.0/mkfs/xfs_mkfs.c
@@ -1973,15 +1973,15 @@ _("Directory ftype field always enabled 
 			usage();
 		}
 
-	} else {
+	} else {	/* !crcs_enabled */
 		/*
-		 * The kernel doesn't currently support crc=0,finobt=1
-		 * filesystems. If crcs are not enabled and the user has not
-		 * explicitly turned finobt on, then silently turn it off to
-		 * avoid an unnecessary warning.
+		 * The kernel doesn't support crc=0,finobt=1 filesystems.
+		 * If crcs are not enabled and the user has not explicitly
+		 * turned finobt on, then silently turn it off to avoid an
+		 * unnecessary warning.
 		 * If the user explicitly tried to use crc=0,finobt=1,
 		 * then issue an error.
-		 * The same is also for sparse inodes.
+		 * The same is also true for sparse inodes and reflink.
 		 */
 		if (cli->sb_feat.finobt && cli_opt_set(&mopts, M_FINOBT)) {
 			fprintf(stderr,
@@ -2004,7 +2004,7 @@ _("rmapbt not supported without CRC supp
 		}
 		cli->sb_feat.rmapbt = false;
 
-		if (cli->sb_feat.reflink) {
+		if (cli->sb_feat.reflink && cli_opt_set(&mopts, M_REFLINK)) {
 			fprintf(stderr,
 _("reflink not supported without CRC support\n"));
 			usage();
@@ -3788,7 +3788,7 @@ main(
 			.finobt = true,
 			.spinodes = true,
 			.rmapbt = false,
-			.reflink = false,
+			.reflink = true,
 			.parent_pointers = false,
 			.nodalign = false,
 			.nortalign = false,
Index: xfsprogs-4.19.0/man/man8/mkfs.xfs.8
===================================================================
--- xfsprogs-4.19.0.orig/man/man8/mkfs.xfs.8
+++ xfsprogs-4.19.0/man/man8/mkfs.xfs.8
@@ -229,9 +229,9 @@ mapping will be changed to the new block
 enables the creation of per-file snapshots and deduplication.  It is only
 available for the data forks of regular files.
 .IP
-By default,
+By default in Red Hat Enterprise Linux 8,
 .B mkfs.xfs
-will not create reference count btrees and therefore will not enable the
+will create reference count btrees and therefore will enable the
 reflink feature.  This feature is only available for filesystems created with
 the (default)
 .B \-m crc=1
@@ -239,6 +239,13 @@ option set. When the option
 .B \-m crc=0
 is used, the reference count btree feature is not supported and reflink is
 disabled.
+.IP
+Note: the filesystem DAX mount option (
+.B \-o dax
+) is incompatible with
+reflink-enabled XFS filesystems.  To use filesystem DAX with XFS, specify the
+.B \-m reflink=0
+option to mkfs.xfs to disable the reflink feature.
 .RE
 .TP
 .BI \-d " data_section_options"