xfs: Add helper function xfs_attr_leaf_addname

This patch adds a helper function xfs_attr_leaf_addname.  While this
does help to break down xfs_attr_set_iter, it does also hoist out some
of the state management.  This patch has been moved to the end of the
clean up series for further discussion.
Suggested-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/xfs/libxfs/xfs_attr.c

@@ -286,6 +286,65 @@ xfs_attr_sf_addname(
 	return -EAGAIN;
 }
 
+STATIC int
+xfs_attr_leaf_addname(
+	struct xfs_attr_item	*attr)
+{
+	struct xfs_da_args	*args = attr->xattri_da_args;
+	struct xfs_inode	*dp = args->dp;
+	int			error;
+
+	if (xfs_attr_is_leaf(dp)) {
+		error = xfs_attr_leaf_try_add(args, attr->xattri_leaf_bp);
+		if (error == -ENOSPC) {
+			error = xfs_attr3_leaf_to_node(args);
+			if (error)
+				return error;
+
+			/*
+			 * Finish any deferred work items and roll the
+			 * transaction once more.  The goal here is to call
+			 * node_addname with the inode and transaction in the
+			 * same state (inode locked and joined, transaction
+			 * clean) no matter how we got to this step.
+			 *
+			 * At this point, we are still in XFS_DAS_UNINIT, but
+			 * when we come back, we'll be a node, so we'll fall
+			 * down into the node handling code below
+			 */
+			trace_xfs_attr_set_iter_return(
+				attr->xattri_dela_state, args->dp);
+			return -EAGAIN;
+		}
+
+		if (error)
+			return error;
+
+		attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
+	} else {
+		error = xfs_attr_node_addname_find_attr(attr);
+		if (error)
+			return error;
+
+		error = xfs_attr_node_addname(attr);
+		if (error)
+			return error;
+
+		/*
+		 * If addname was successful, and we dont need to alloc or
+		 * remove anymore blks, we're done.
+		 */
+		if (!args->rmtblkno &&
+		    !(args->op_flags & XFS_DA_OP_RENAME))
+			return 0;
+
+		attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
+	}
+
+	trace_xfs_attr_leaf_addname_return(attr->xattri_dela_state, args->dp);
+	return -EAGAIN;
+}
+
 /*
  * Set the attribute specified in @args.
  * This routine is meant to function as a delayed operation, and may return
@@ -321,57 +380,8 @@ xfs_attr_set_iter(
 			attr->xattri_leaf_bp = NULL;
 		}
 
-		if (xfs_attr_is_leaf(dp)) {
-			error = xfs_attr_leaf_try_add(args,
-						      attr->xattri_leaf_bp);
-			if (error == -ENOSPC) {
-				error = xfs_attr3_leaf_to_node(args);
-				if (error)
-					return error;
-
-				/*
-				 * Finish any deferred work items and roll the
-				 * transaction once more.  The goal here is to
-				 * call node_addname with the inode and
-				 * transaction in the same state (inode locked
-				 * and joined, transaction clean) no matter how
-				 * we got to this step.
-				 *
-				 * At this point, we are still in
-				 * XFS_DAS_UNINIT, but when we come back, we'll
-				 * be a node, so we'll fall down into the node
-				 * handling code below
-				 */
-				trace_xfs_attr_set_iter_return(
-					attr->xattri_dela_state, args->dp);
-				return -EAGAIN;
-			} else if (error) {
-				return error;
-			}
-
-			attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
-		} else {
-			error = xfs_attr_node_addname_find_attr(attr);
-			if (error)
-				return error;
+		return xfs_attr_leaf_addname(attr);
 
-			error = xfs_attr_node_addname(attr);
-			if (error)
-				return error;
-
-			/*
-			 * If addname was successful, and we dont need to alloc
-			 * or remove anymore blks, we're done.
-			 */
-			if (!args->rmtblkno &&
-			    !(args->op_flags & XFS_DA_OP_RENAME))
-				return 0;
-
-			attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
-		}
-		trace_xfs_attr_set_iter_return(attr->xattri_dela_state,
-					       args->dp);
-		return -EAGAIN;
 	case XFS_DAS_FOUND_LBLK:
 		/*
 		 * If there was an out-of-line value, allocate the blocks we

fs/xfs/xfs_trace.h

@@ -4150,6 +4150,7 @@ DEFINE_EVENT(xfs_das_state_class, name, \
 	TP_ARGS(das, ip))
 DEFINE_DAS_STATE_EVENT(xfs_attr_sf_addname_return);
 DEFINE_DAS_STATE_EVENT(xfs_attr_set_iter_return);
+DEFINE_DAS_STATE_EVENT(xfs_attr_leaf_addname_return);
 DEFINE_DAS_STATE_EVENT(xfs_attr_node_addname_return);
 DEFINE_DAS_STATE_EVENT(xfs_attr_remove_iter_return);
 DEFINE_DAS_STATE_EVENT(xfs_attr_rmtval_remove_return);