xfs: Add log attribute error tag

This patch adds an error tag that we can use to test log attribute
recovery and replay
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/xfs/libxfs/xfs_errortag.h

@@ -59,7 +59,8 @@
 #define XFS_ERRTAG_REDUCE_MAX_IEXTENTS			36
 #define XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT		37
 #define XFS_ERRTAG_AG_RESV_FAIL				38
-#define XFS_ERRTAG_MAX					39
+#define XFS_ERRTAG_LARP					39
+#define XFS_ERRTAG_MAX					40
 
 /*
  * Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@@ -103,5 +104,6 @@
 #define XFS_RANDOM_REDUCE_MAX_IEXTENTS			1
 #define XFS_RANDOM_BMAP_ALLOC_MINLEN_EXTENT		1
 #define XFS_RANDOM_AG_RESV_FAIL				1
+#define XFS_RANDOM_LARP					1
 
 #endif /* __XFS_ERRORTAG_H_ */

fs/xfs/xfs_attr_item.c

@@ -24,6 +24,7 @@
 #include "xfs_trace.h"
 #include "xfs_inode.h"
 #include "xfs_trans_space.h"
+#include "xfs_errortag.h"
 #include "xfs_error.h"
 #include "xfs_log_priv.h"
 #include "xfs_log_recover.h"
@@ -310,6 +311,11 @@ xfs_xattri_finish_update(
 					     XFS_ATTR_OP_FLAGS_TYPE_MASK;
 	int				error;
 
+	if (XFS_TEST_ERROR(false, args->dp->i_mount, XFS_ERRTAG_LARP)) {
+		error = -EIO;
+		goto out;
+	}
+
 	switch (op) {
 	case XFS_ATTR_OP_FLAGS_SET:
 		error = xfs_attr_set_iter(dac);
@@ -323,6 +329,7 @@ xfs_xattri_finish_update(
 		break;
 	}
 
+out:
 	/*
 	 * Mark the transaction dirty, even on error. This ensures the
 	 * transaction is aborted, which:

fs/xfs/xfs_error.c

@@ -57,6 +57,7 @@ static unsigned int xfs_errortag_random_default[] = {
 	XFS_RANDOM_REDUCE_MAX_IEXTENTS,
 	XFS_RANDOM_BMAP_ALLOC_MINLEN_EXTENT,
 	XFS_RANDOM_AG_RESV_FAIL,
+	XFS_RANDOM_LARP,
 };
 
 struct xfs_errortag_attr {
@@ -170,6 +171,7 @@ XFS_ERRORTAG_ATTR_RW(buf_ioerror,	XFS_ERRTAG_BUF_IOERROR);
 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);
 
 static struct attribute *xfs_errortag_attrs[] = {
 	XFS_ERRORTAG_ATTR_LIST(noerror),
@@ -211,6 +213,7 @@ static struct attribute *xfs_errortag_attrs[] = {
 	XFS_ERRORTAG_ATTR_LIST(reduce_max_iextents),
 	XFS_ERRORTAG_ATTR_LIST(bmap_alloc_minlen_extent),
 	XFS_ERRORTAG_ATTR_LIST(ag_resv_fail),
+	XFS_ERRORTAG_ATTR_LIST(larp),
 	NULL,
 };
 ATTRIBUTE_GROUPS(xfs_errortag);