[PATCH v4 08/17] xfs: Factor out xfs_attr_leaf_addname helper

[Allison Collins <allison.henderson@xxxxxxxxxx>]

Factor out new helper function xfs_attr_leaf_try_add.
Because new delayed attribute routines cannot roll
transactions, we carve off the parts of
xfs_attr_leaf_addname that we can use.  This will help
to reduce repetitive code later when we introduce
delayed attributes.

Signed-off-by: Allison Collins <allison.henderson@xxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_attr.c | 84 +++++++++++++++++++++++++++++-------------------
 1 file changed, 51 insertions(+), 33 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 212995f..dda2eba 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -305,10 +305,33 @@ xfs_attr_set_args(
 		}
 	}
 
-	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
+	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
 		error = xfs_attr_leaf_addname(args);
-	else
+		if (error == -ENOSPC) {
+			/*
+			 * Commit that transaction so that the node_addname()
+			 * call can manage its own transactions.
+			 */
+			error = xfs_defer_finish(&args->trans);
+			if (error)
+				return error;
+
+			/*
+			 * Commit the current trans (including the inode) and
+			 * start a new one.
+			 */
+			error = xfs_trans_roll_inode(&args->trans, dp);
+			if (error)
+				return error;
+
+			/*
+			 * Fob the rest of the problem off on the Btree code.
+			 */
+			error = xfs_attr_node_addname(args);
+		}
+	} else {
 		error = xfs_attr_node_addname(args);
+	}
 	return error;
 }
 
@@ -601,21 +624,12 @@ xfs_attr_shortform_addname(xfs_da_args_t *args)
  * External routines when attribute list is one block
  *========================================================================*/
 
-/*
- * Add a name to the leaf attribute list structure
- *
- * This leaf block cannot have a "remote" value, we only call this routine
- * if bmap_one_block() says there is only one block (ie: no remote blks).
- */
 STATIC int
-xfs_attr_leaf_addname(
-	struct xfs_da_args	*args)
+xfs_attr_leaf_try_add(
+	struct xfs_da_args	*args,
+	struct xfs_buf		*bp)
 {
-	struct xfs_buf		*bp;
-	int			retval, error, forkoff;
-	struct xfs_inode	*dp = args->dp;
-
-	trace_xfs_attr_leaf_addname(args);
+	int			retval, error;
 
 	/*
 	 * Look up the given attribute in the leaf block.  Figure out if
@@ -661,31 +675,35 @@ xfs_attr_leaf_addname(
 	retval = xfs_attr3_leaf_add(bp, args);
 	if (retval == -ENOSPC) {
 		/*
-		 * Promote the attribute list to the Btree format, then
-		 * Commit that transaction so that the node_addname() call
-		 * can manage its own transactions.
+		 * Promote the attribute list to the Btree format.
+		 * Unless an error occurs, retain the -ENOSPC retval
 		 */
 		error = xfs_attr3_leaf_to_node(args);
 		if (error)
 			return error;
-		error = xfs_defer_finish(&args->trans);
-		if (error)
-			return error;
+	}
+	return retval;
+}
 
-		/*
-		 * Commit the current trans (including the inode) and start
-		 * a new one.
-		 */
-		error = xfs_trans_roll_inode(&args->trans, dp);
-		if (error)
-			return error;
 
-		/*
-		 * Fob the whole rest of the problem off on the Btree code.
-		 */
-		error = xfs_attr_node_addname(args);
+/*
+ * Add a name to the leaf attribute list structure
+ *
+ * This leaf block cannot have a "remote" value, we only call this routine
+ * if bmap_one_block() says there is only one block (ie: no remote blks).
+ */
+STATIC int
+xfs_attr_leaf_addname(struct xfs_da_args	*args)
+{
+	int			error, forkoff;
+	struct xfs_buf		*bp = NULL;
+	struct xfs_inode	*dp = args->dp;
+
+	trace_xfs_attr_leaf_addname(args);
+
+	error = xfs_attr_leaf_try_add(args, bp);
+	if (error)
 		return error;
-	}
 
 	/*
 	 * Commit the transaction that added the attr name so that
-- 
2.7.4