[PATCH] ecryptfs: nested locking annotation

ecryptfs uses a lock_parent() function, which I hope really locks the parents
and is not abused
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/ecryptfs/inode.c

@@ -38,7 +38,7 @@ static struct dentry *lock_parent(struct dentry *dentry)
 	struct dentry *dir;
 
 	dir = dget(dentry->d_parent);
-	mutex_lock(&(dir->d_inode->i_mutex));
+	mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
 	return dir;
 }