diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h
index 2dc441da0333..ac5abee05d80 100644
--- a/fs/xfs/libxfs/xfs_errortag.h
+++ b/fs/xfs/libxfs/xfs_errortag.h
@@ -76,7 +76,8 @@
 #define XFS_ERRTAG_FORCE_ZERO_RANGE			46
 #define XFS_ERRTAG_ZONE_RESET				47
 #define XFS_ERRTAG_BOUNCE_REREAD			48
-#define XFS_ERRTAG_MAX					49
+#define XFS_ERRTAG_WB_COW_CONVERT_ERROR			49
+#define XFS_ERRTAG_MAX					50
 
 /*
  * Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@@ -139,7 +140,8 @@ XFS_ERRTAG(EXCHMAPS_FINISH_ONE,	exchmaps_finish_one,	1) \
 XFS_ERRTAG(METAFILE_RESV_CRITICAL, metafile_resv_crit,	4) \
 XFS_ERRTAG(FORCE_ZERO_RANGE,	force_zero_range,	4) \
 XFS_ERRTAG(ZONE_RESET,		zone_reset,		1)  \
-XFS_ERRTAG(BOUNCE_REREAD,	bounce_reread,		XFS_RANDOM_DEFAULT)
+XFS_ERRTAG(BOUNCE_REREAD,	bounce_reread,		XFS_RANDOM_DEFAULT) \
+XFS_ERRTAG(WB_COW_CONVERT_ERROR, wb_cow_convert_error,	1)
 #endif /* XFS_ERRTAG */
 
 #endif /* __XFS_ERRORTAG_H_ */
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 480136136635..104542b10d9e 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -34,6 +34,8 @@
 #include "xfs_rtalloc.h"
 #include "xfs_rtgroup.h"
 #include "xfs_metafile.h"
+#include "xfs_errortag.h"
+#include "xfs_error.h"
 
 /*
  * Copy on Write of Shared Blocks
@@ -346,6 +348,9 @@ xfs_reflink_convert_cow(
 
 	ASSERT(count != 0);
 
+	if (XFS_TEST_ERROR(mp, XFS_ERRTAG_WB_COW_CONVERT_ERROR))
+		return -EIO;
+
 	xfs_ilock(ip, XFS_ILOCK_EXCL);
 	error = xfs_reflink_convert_cow_locked(ip, offset_fsb, count_fsb);
 	xfs_iunlock(ip, XFS_ILOCK_EXCL);