linux-kernel - Re: [f2fs-dev] [PATCH V2] f2fs: Avoid double lock for cp

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Date:   Wed, 29 Apr 2020 15:44:02 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Sayali Lokhande <sayalil@...eaurora.org>
Cc:     Markus Elfring <Markus.Elfring@....de>,
        linux-f2fs-devel@...ts.sourceforge.net,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <yuchao0@...wei.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH V2] f2fs: Avoid double lock for cp_rwsem
 during checkpoint

On Wed, Apr 29, 2020 at 10:28:36AM +0530, Sayali Lokhande wrote:
> Hi Markus
> 
> On 4/27/2020 4:08 PM, Markus Elfring wrote:
> > > … This results in deadlock as
> > > iput() tries to hold cp_rwsem, which is already held at the
> > > beginning by checkpoint->block_operations().
> > Will another imperative wording become helpful besides the provided information
> > for this change description?
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=6a8b55ed4056ea5559ebe4f6a4b247f627870d4c#n151
> > 
> > Would you like to add the tag “Fixes” because of adjustments
> > for the data synchronisation?
> 
> I couldn't find any past commit which suits to be added under "Fixes" here.
> Let me know if you have any other comment.

This looks really old.  Maybe commit 399368372ed9 ("f2fs: introduce a
new global lock scheme")?

regards,
dan carpenter