[33/41] xfs: distinguish extra split from real ENOSPC from xfs_attr_node_try_addname

Commit Message

Darrick J. Wong Oct. 31, 2024, 11:17 p.m. UTC

From: Christoph Hellwig <[e-mail]>

Source kernel commit: b3f4e84e2f438a119b7ca8684a25452b3e57c0f0

Just like xfs_attr3_leaf_split, xfs_attr_node_try_addname can return
-ENOSPC both for an actual failure to allocate a disk block, but also
to signal the caller to convert the format of the attr fork.  Use magic
1 to ask for the conversion here as well.

Note that unlike the similar issue in xfs_attr3_leaf_split, this one was
only found by code review.

Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Darrick J. Wong <[e-mail]>
Signed-off-by: Carlos Maiolino <[e-mail]>
---
 libxfs/xfs_attr.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

Patch

diff --git a/libxfs/xfs_attr.c b/libxfs/xfs_attr.c
index 9ac7124b0a7bc1..150aaddf7f9fed 100644
--- a/libxfs/xfs_attr.c
+++ b/libxfs/xfs_attr.c
@@ -596,7 +596,7 @@  xfs_attr_node_addname(
 		return error;
 
 	error = xfs_attr_node_try_addname(attr);
-	if (error == -ENOSPC) {
+	if (error == 1) {
 		error = xfs_attr3_leaf_to_node(args);
 		if (error)
 			return error;
@@ -1385,9 +1385,12 @@  xfs_attr_node_addname_find_attr(
 /*
  * Add a name to a Btree-format attribute list.
  *
- * This will involve walking down the Btree, and may involve splitting
- * leaf nodes and even splitting intermediate nodes up to and including
- * the root node (a special case of an intermediate node).
+ * This will involve walking down the Btree, and may involve splitting leaf
+ * nodes and even splitting intermediate nodes up to and including the root
+ * node (a special case of an intermediate node).
+ *
+ * If the tree was still in single leaf format and needs to converted to
+ * real node format return 1 and let the caller handle that.
  */
 static int
 xfs_attr_node_try_addname(
@@ -1409,7 +1412,7 @@  xfs_attr_node_try_addname(
 			 * out-of-line values so it looked like it *might*
 			 * have been a b-tree. Let the caller deal with this.
 			 */
-			error = -ENOSPC;
+			error = 1;
 			goto out;
 		}