To: Eric Sandeen <sandeen@sandeen.net>
Cc: Eric Sandeen <sandeen@redhat.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
       t-sato@yk.jp.nec.com
Subject: Re: [PATCH] Allow SysRq emergency sync to thaw frozen filesystems
In-Reply-To: Your message of "Thu, 15 Jan 2009 21:59:10 CST."
             <4970060E.3080306@sandeen.net>
From: Valdis.Kletnieks@vt.edu
References: <496EB639.6090800@redhat.com> <20090115162031.a512232b.akpm@linux-foundation.org> <497003CC.8030503@redhat.com>
            <4970060E.3080306@sandeen.net>
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Date: Fri, 16 Jan 2009 10:33:48 -0500
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On Thu, 15 Jan 2009 21:59:10 CST, Eric Sandeen said:

> Oh, actually, I'd think not.  If the freeze was done properly by the
> filesystem, all data was flushed, the fs was quiesced, and new IO was
> blocked.  pdflush should never be visiting these...

Yes, but a lot of 'if's - and usually you're reaching for sysrq-S precisely
*because* you suspect that stuff wasn't happening properly on its own...

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