xfs: add leaf split error tag

Add an error tag on xfs_da3_split to test log attribute recovery
and replay.
Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Chandan Babu R <chandan.babu@oracle.com>
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/xfs/libxfs/xfs_da_btree.c

@@ -22,6 +22,7 @@
 #include "xfs_trace.h"
 #include "xfs_buf_item.h"
 #include "xfs_log.h"
+#include "xfs_errortag.h"
 
 /*
  * xfs_da_btree.c
@@ -482,6 +483,9 @@ xfs_da3_split(
 
 	trace_xfs_da_split(state->args);
 
+	if (XFS_TEST_ERROR(false, state->mp, XFS_ERRTAG_DA_LEAF_SPLIT))
+		return -EIO;
+
 	/*
 	 * Walk back up the tree splitting/inserting/adjusting as necessary.
 	 * If we need to insert and there isn't room, split the node, then

fs/xfs/libxfs/xfs_errortag.h

@@ -60,7 +60,8 @@
 #define XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT		37
 #define XFS_ERRTAG_AG_RESV_FAIL				38
 #define XFS_ERRTAG_LARP					39
-#define XFS_ERRTAG_MAX					40
+#define XFS_ERRTAG_DA_LEAF_SPLIT			40
+#define XFS_ERRTAG_MAX					41
 
 /*
  * Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@@ -105,5 +106,6 @@
 #define XFS_RANDOM_BMAP_ALLOC_MINLEN_EXTENT		1
 #define XFS_RANDOM_AG_RESV_FAIL				1
 #define XFS_RANDOM_LARP					1
+#define XFS_RANDOM_DA_LEAF_SPLIT			1
 
 #endif /* __XFS_ERRORTAG_H_ */

fs/xfs/xfs_error.c

@@ -58,6 +58,7 @@ static unsigned int xfs_errortag_random_default[] = {
 	XFS_RANDOM_BMAP_ALLOC_MINLEN_EXTENT,
 	XFS_RANDOM_AG_RESV_FAIL,
 	XFS_RANDOM_LARP,
+	XFS_RANDOM_DA_LEAF_SPLIT,
 };
 
 struct xfs_errortag_attr {
@@ -172,6 +173,7 @@ XFS_ERRORTAG_ATTR_RW(reduce_max_iextents,	XFS_ERRTAG_REDUCE_MAX_IEXTENTS);
 XFS_ERRORTAG_ATTR_RW(bmap_alloc_minlen_extent,	XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT);
 XFS_ERRORTAG_ATTR_RW(ag_resv_fail, XFS_ERRTAG_AG_RESV_FAIL);
 XFS_ERRORTAG_ATTR_RW(larp,		XFS_ERRTAG_LARP);
+XFS_ERRORTAG_ATTR_RW(da_leaf_split,	XFS_ERRTAG_DA_LEAF_SPLIT);
 
 static struct attribute *xfs_errortag_attrs[] = {
 	XFS_ERRORTAG_ATTR_LIST(noerror),
@@ -214,6 +216,7 @@ static struct attribute *xfs_errortag_attrs[] = {
 	XFS_ERRORTAG_ATTR_LIST(bmap_alloc_minlen_extent),
 	XFS_ERRORTAG_ATTR_LIST(ag_resv_fail),
 	XFS_ERRORTAG_ATTR_LIST(larp),
+	XFS_ERRORTAG_ATTR_LIST(da_leaf_split),
 	NULL,
 };
 ATTRIBUTE_GROUPS(xfs_errortag);