linux-kernel - Re: [PATCH] hugetlbfs: lockdep annotate root inode properly

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Message-ID: <87y5ra8j22.fsf@linux.vnet.ibm.com>
Date:	Fri, 09 Mar 2012 10:30:53 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>
Cc:	Tyler Hicks <tyhicks@...onical.com>, linux-mm@...ck.org,
	davej@...hat.com, jboyer@...hat.com, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH] hugetlbfs: lockdep annotate root inode properly

On Thu, 8 Mar 2012 14:19:38 -0800, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Thu, 8 Mar 2012 21:49:52 +0000
> Al Viro <viro@...IV.linux.org.uk> wrote:
> 
> > > So we need to pull the i_mutex out of hugetlbfs_file_mmap().
> > 
> > IIRC, you have a patch in your tree doing just that...
> 
> Nope.
> 
> But it seems that you've recently seen such a patch - can you recall
> where?  Or was it the ecryptfs thing?
> 

So what we ended up doing was

http://article.gmane.org/gmane.linux.kernel.mm/74732

The patch update hugetlbfs_read to not take i_mutex. That should make
sure deadlock won't happen. 


-aneesh

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