linux-kernel - deferring _

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Message-ID: <1340369098.2464.20.camel@falcor>
Date:	Fri, 22 Jun 2012 08:44:58 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	". James Morris" <jmorris@...ei.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: deferring __fput()

Al,

I really appreciate all of the work that has gone into making __fput()
lockless - making the syscalls use get/put_light(), signal changes, and
using Oleg's task_work_add() to defer processes. 

Currently, when unmapping a file after closing it, I'm not getting the
mmap_sem/i_mutex lockdep any more.  This seems due to Tyler Hick's
commit 978d6d8 "vfs: Correctly set the dir i_mutex lockdep class",
rather than the above changes.

Although the mmap_sem/i_mutex lockdep doesn't exist anymore, before
upstreaming IMA-appraisal, the issue with __fput() should probably be
resolved. :)   What else needs to be done to make __fput() lockless?
How can I help?

thanks,

Mimi

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