xfs: consolidate the xfs_attr_defer_* helpers

Consolidate the xfs_attr_defer_* helpers into a single xfs_attr_defer_add
one that picks the right dela_state based on the passed in operation.
Also move to a single trace point as the actual operation is visible
through the flags in the delta_state passed to the trace point.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

fs/xfs/libxfs/xfs_attr.c

@@ -880,11 +880,10 @@ xfs_attr_lookup(
 	return error;
 }
 
-static int
-xfs_attr_intent_init(
+static void
+xfs_attr_defer_add(
 	struct xfs_da_args	*args,
-	unsigned int		op_flags,	/* op flag (set or remove) */
-	struct xfs_attr_intent	**attr)		/* new xfs_attr_intent */
+	unsigned int		op_flags)
 {
 
 	struct xfs_attr_intent	*new;
@@ -893,66 +892,22 @@ xfs_attr_intent_init(
 	new->xattri_op_flags = op_flags;
 	new->xattri_da_args = args;
 
-	*attr = new;
-	return 0;
-}
-
-/* Sets an attribute for an inode as a deferred operation */
-static int
-xfs_attr_defer_add(
-	struct xfs_da_args	*args)
-{
-	struct xfs_attr_intent	*new;
-	int			error = 0;
-
-	error = xfs_attr_intent_init(args, XFS_ATTRI_OP_FLAGS_SET, &new);
-	if (error)
-		return error;
+	switch (op_flags) {
+	case XFS_ATTRI_OP_FLAGS_SET:
+		new->xattri_dela_state = xfs_attr_init_add_state(args);
+		break;
+	case XFS_ATTRI_OP_FLAGS_REPLACE:
+		new->xattri_dela_state = xfs_attr_init_replace_state(args);
+		break;
+	case XFS_ATTRI_OP_FLAGS_REMOVE:
+		new->xattri_dela_state = xfs_attr_init_remove_state(args);
+		break;
+	default:
+		ASSERT(0);
+	}
 
-	new->xattri_dela_state = xfs_attr_init_add_state(args);
 	xfs_defer_add(args->trans, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
 	trace_xfs_attr_defer_add(new->xattri_dela_state, args->dp);
-
-	return 0;
-}
-
-/* Sets an attribute for an inode as a deferred operation */
-static int
-xfs_attr_defer_replace(
-	struct xfs_da_args	*args)
-{
-	struct xfs_attr_intent	*new;
-	int			error = 0;
-
-	error = xfs_attr_intent_init(args, XFS_ATTRI_OP_FLAGS_REPLACE, &new);
-	if (error)
-		return error;
-
-	new->xattri_dela_state = xfs_attr_init_replace_state(args);
-	xfs_defer_add(args->trans, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
-	trace_xfs_attr_defer_replace(new->xattri_dela_state, args->dp);
-
-	return 0;
-}
-
-/* Removes an attribute for an inode as a deferred operation */
-static int
-xfs_attr_defer_remove(
-	struct xfs_da_args	*args)
-{
-
-	struct xfs_attr_intent	*new;
-	int			error;
-
-	error  = xfs_attr_intent_init(args, XFS_ATTRI_OP_FLAGS_REMOVE, &new);
-	if (error)
-		return error;
-
-	new->xattri_dela_state = xfs_attr_init_remove_state(args);
-	xfs_defer_add(args->trans, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
-	trace_xfs_attr_defer_remove(new->xattri_dela_state, args->dp);
-
-	return 0;
 }
 
 /*
@@ -1038,16 +993,16 @@ xfs_attr_set(
 	error = xfs_attr_lookup(args);
 	switch (error) {
 	case -EEXIST:
-		/* if no value, we are performing a remove operation */
 		if (!args->value) {
-			error = xfs_attr_defer_remove(args);
+			/* if no value, we are performing a remove operation */
+			xfs_attr_defer_add(args, XFS_ATTRI_OP_FLAGS_REMOVE);
 			break;
 		}
+
 		/* Pure create fails if the attr already exists */
 		if (args->attr_flags & XATTR_CREATE)
 			goto out_trans_cancel;
-
-		error = xfs_attr_defer_replace(args);
+		xfs_attr_defer_add(args, XFS_ATTRI_OP_FLAGS_REPLACE);
 		break;
 	case -ENOATTR:
 		/* Can't remove what isn't there. */
@@ -1057,14 +1012,11 @@ xfs_attr_set(
 		/* Pure replace fails if no existing attr to replace. */
 		if (args->attr_flags & XATTR_REPLACE)
 			goto out_trans_cancel;
-
-		error = xfs_attr_defer_add(args);
+		xfs_attr_defer_add(args, XFS_ATTRI_OP_FLAGS_SET);
 		break;
 	default:
 		goto out_trans_cancel;
 	}
-	if (error)
-		goto out_trans_cancel;
 
 	/*
 	 * If this is a synchronous mount, make sure that the

fs/xfs/xfs_trace.h

@@ -4408,8 +4408,6 @@ DEFINE_DAS_STATE_EVENT(xfs_attr_remove_iter_return);
 DEFINE_DAS_STATE_EVENT(xfs_attr_rmtval_alloc);
 DEFINE_DAS_STATE_EVENT(xfs_attr_rmtval_remove_return);
 DEFINE_DAS_STATE_EVENT(xfs_attr_defer_add);
-DEFINE_DAS_STATE_EVENT(xfs_attr_defer_replace);
-DEFINE_DAS_STATE_EVENT(xfs_attr_defer_remove);
 
 
 TRACE_EVENT(xfs_force_shutdown,