lockdep: per filesystem inode lock class
Give each filesystem its own inode lock class. The various filesystems have
different locking order wrt the inode locks; esp. the pseudo filesystems differ
from the rest.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 16421f6..0cad20e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1302,8 +1302,13 @@
 	struct module *owner;
 	struct file_system_type * next;
 	struct list_head fs_supers;
+
 	struct lock_class_key s_lock_key;
 	struct lock_class_key s_umount_key;
+
+	struct lock_class_key i_lock_key;
+	struct lock_class_key i_mutex_key;
+	struct lock_class_key i_alloc_sem_key;
 };
 
 extern int get_sb_bdev(struct file_system_type *fs_type,