xfs: Simplify xfs_attr_node_addname

Invert the rename logic in xfs_attr_node_addname to simplify the
delayed attr logic later.
Signed-off-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Dave Chinner <dchinner@redhat.com>

fs/xfs/libxfs/xfs_attr.c

@@ -1025,79 +1025,75 @@ xfs_attr_node_addname(
 			return error;
 	}
 
-	/*
-	 * If this is an atomic rename operation, we must "flip" the
-	 * incomplete flags on the "new" and "old" attribute/value pairs
-	 * so that one disappears and one appears atomically.  Then we
-	 * must remove the "old" attribute/value pair.
-	 */
-	if (args->op_flags & XFS_DA_OP_RENAME) {
-		/*
-		 * In a separate transaction, set the incomplete flag on the
-		 * "old" attr and clear the incomplete flag on the "new" attr.
-		 */
-		error = xfs_attr3_leaf_flipflags(args);
-		if (error)
-			goto out;
-		/*
-		 * Commit the flag value change and start the next trans in
-		 * series
-		 */
-		error = xfs_trans_roll_inode(&args->trans, args->dp);
-		if (error)
-			goto out;
-
+	if (!(args->op_flags & XFS_DA_OP_RENAME)) {
 		/*
-		 * Dismantle the "old" attribute/value pair by removing
-		 * a "remote" value (if it exists).
+		 * Added a "remote" value, just clear the incomplete flag.
 		 */
-		xfs_attr_restore_rmt_blk(args);
+		if (args->rmtblkno > 0)
+			error = xfs_attr3_leaf_clearflag(args);
+		retval = error;
+		goto out;
+	}
 
-		if (args->rmtblkno) {
-			error = xfs_attr_rmtval_invalidate(args);
-			if (error)
-				return error;
+	/*
+	 * If this is an atomic rename operation, we must "flip" the incomplete
+	 * flags on the "new" and "old" attribute/value pairs so that one
+	 * disappears and one appears atomically.  Then we must remove the "old"
+	 * attribute/value pair.
+	 *
+	 * In a separate transaction, set the incomplete flag on the "old" attr
+	 * and clear the incomplete flag on the "new" attr.
+	 */
+	error = xfs_attr3_leaf_flipflags(args);
+	if (error)
+		goto out;
+	/*
+	 * Commit the flag value change and start the next trans in series
+	 */
+	error = xfs_trans_roll_inode(&args->trans, args->dp);
+	if (error)
+		goto out;
 
-			error = xfs_attr_rmtval_remove(args);
-			if (error)
-				return error;
-		}
+	/*
+	 * Dismantle the "old" attribute/value pair by removing a "remote" value
+	 * (if it exists).
+	 */
+	xfs_attr_restore_rmt_blk(args);
 
-		/*
-		 * Re-find the "old" attribute entry after any split ops.
-		 * The INCOMPLETE flag means that we will find the "old"
-		 * attr, not the "new" one.
-		 */
-		args->attr_filter |= XFS_ATTR_INCOMPLETE;
-		state = xfs_da_state_alloc(args);
+	if (args->rmtblkno) {
+		error = xfs_attr_rmtval_invalidate(args);
+		if (error)
+			return error;
 
-		state->inleaf = 0;
-		error = xfs_da3_node_lookup_int(state, &retval);
+		error = xfs_attr_rmtval_remove(args);
 		if (error)
-			goto out;
+			return error;
+	}
 
-		/*
-		 * Remove the name and update the hashvals in the tree.
-		 */
-		blk = &state->path.blk[ state->path.active-1 ];
-		ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
-		error = xfs_attr3_leaf_remove(blk->bp, args);
-		xfs_da3_fixhashpath(state, &state->path);
+	/*
+	 * Re-find the "old" attribute entry after any split ops. The INCOMPLETE
+	 * flag means that we will find the "old" attr, not the "new" one.
+	 */
+	args->attr_filter |= XFS_ATTR_INCOMPLETE;
+	state = xfs_da_state_alloc(args);
+	state->inleaf = 0;
+	error = xfs_da3_node_lookup_int(state, &retval);
+	if (error)
+		goto out;
 
-		/*
-		 * Check to see if the tree needs to be collapsed.
-		 */
-		if (retval && (state->path.active > 1)) {
-			error = xfs_da3_join(state);
-			if (error)
-				goto out;
-		}
+	/*
+	 * Remove the name and update the hashvals in the tree.
+	 */
+	blk = &state->path.blk[state->path.active-1];
+	ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
+	error = xfs_attr3_leaf_remove(blk->bp, args);
+	xfs_da3_fixhashpath(state, &state->path);
 
-	} else if (args->rmtblkno > 0) {
-		/*
-		 * Added a "remote" value, just clear the incomplete flag.
-		 */
-		error = xfs_attr3_leaf_clearflag(args);
+	/*
+	 * Check to see if the tree needs to be collapsed.
+	 */
+	if (retval && (state->path.active > 1)) {
+		error = xfs_da3_join(state);
 		if (error)
 			goto out;
 	}