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-rw-r--r--fs/xfs/xfs_filestream.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/xfs/xfs_filestream.c b/fs/xfs/xfs_filestream.c
index 9b715dce569..9124425b7f2 100644
--- a/fs/xfs/xfs_filestream.c
+++ b/fs/xfs/xfs_filestream.c
@@ -744,9 +744,15 @@ xfs_filestream_new_ag(
* If the file's parent directory is known, take its iolock in exclusive
* mode to prevent two sibling files from racing each other to migrate
* themselves and their parent to different AGs.
+ *
+ * Note that we lock the parent directory iolock inside the child
+ * iolock here. That's fine as we never hold both parent and child
+ * iolock in any other place. This is different from the ilock,
+ * which requires locking of the child after the parent for namespace
+ * operations.
*/
if (pip)
- xfs_ilock(pip, XFS_IOLOCK_EXCL);
+ xfs_ilock(pip, XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT);
/*
* A new AG needs to be found for the file. If the file's parent