Merge branch 'tty-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...

[pandora-kernel.git] / fs / xfs / xfs_filestream.c

diff --git a/fs/xfs/xfs_filestream.c b/fs/xfs/xfs_filestream.c
index 9b715dc..9124425 100644 (file)
--- 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