linux-ext4 - Re: ext4: (2.6.34-rc4): This should not happen!! Data will be lost

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Message-ID: <4BCA1DFB.5030501@redhat.com>
Date:	Sat, 17 Apr 2010 15:45:47 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Bernd Schubert <bernd.schubert@...tmail.fm>
CC:	Andre Noll <maan@...temlinux.org>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Linux Driver <Linux-Driver@...gic.com>,
	Thomas Helle <Helle@...bingen.mpg.de>
Subject: Re: ext4: (2.6.34-rc4): This should not happen!!  Data will be lost

Bernd Schubert wrote:
...

> Altogether filesystem unrelated. The filesystem just might be the reason for a 
> synchronize-cache, e.g. barriers, etc.

Interesting that it only happens at enospc time though - the fs would
be sending barriers in general usage.

Although, as ext4 fills, it does do more syncing/flushing to try to
eke out that last bit of space.... hmm....

Andre, just for fun, you might try mounting -o nodelalloc, fill it again,
and see if you see the same behavior.

If not, you might do it again w/ defaults, and capture blktrace data, which
I think will trace barrier requests as well.

(or, maybe also try testing with -o nobarrier)

I still don't think it's likely a filesystem problem but maybe you can
pinpoint the fs behavior that triggers it.

-Eric

> Greetings from Tübingen,
> Bernd 
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