linux-ext4 - Re: an issue of ext4

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Date:	Thu, 6 Mar 2014 20:52:55 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	"Dilger, Andreas" <andreas.dilger@...el.com>
Cc:	"Zhang, Hongchao" <hongchao.zhang@...el.com>,
	Eric Sandeen <sandeen@...hat.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: an issue of ext4

On Thu, Mar 06, 2014 at 11:57:15PM +0000, Dilger, Andreas wrote:
> However, looking more closely at the upstream kernel, I see that this
> code was changed by Dmitry Monakhov in v2.6.34-rc7-16-g84061e0 to
> move the counters after journal init (almost the same as Hongchao's
> patch does) but then you submitted a patch v2.6.37-rc1-3-gce7e010
> to initialize the percpu counters are both before and after the
> journal is loaded.  It isn't clear from your commit comment why
> the patch to load them both before and after was needed?

I can't remembe the code path that was referencing one or more of the
percpu counters, it must have been some non-common corner case, since
we didn't notice the issue right away, but I believe that's why the
change was made.  My bad for not including more details in the commit
description....

						- Ted
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