[PATCH] BKL documentation update change

I added ->readdir(), and a new section referring to the sb_op BKL shift
as well.

Documentation/filesystems/porting

@@ -81,13 +81,20 @@ can relax your locking.
 [mandatory]
 
 ->lookup(), ->truncate(), ->create(), ->unlink(), ->mknod(), ->mkdir(),
-->rmdir(), ->link(), ->lseek(), ->symlink() and ->rename() are called
-without BKL now.  Grab it on the entry, drop upon return - that will
-guarantee the same locking you used to have.  If your method or its
+->rmdir(), ->link(), ->lseek(), ->symlink(), ->rename() and ->readdir() 
+are called without BKL now.  Grab it on the entry, drop upon return - that 
+will guarantee the same locking you used to have.  If your method or its
 parts do not need BKL - better yet, now you can shift lock_kernel() and
 unlock_kernel() so that they would protect exactly what needs to be
 protected.
 
+---
+[mandatory]
+
+BKL is also moved from around sb operations.  ->write_super() Is now called 
+without BKL held.  BKL should have been shifted into individual fs sb_op
+functions.  If you don't need it, remove it.  
+
 ---
 [informational]