linux-ext4 - Re: EXT3 way too happy with write errors

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Message-ID: <20081218174921.GF20515@hostway.ca>
Date:	Thu, 18 Dec 2008 09:49:22 -0800
From:	Simon Kirby <sim@...nation.com>
To:	Jan Kara <jack@...e.cz>,
	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	Mike Snitzer <snitzer@...il.com>,
	Andreas Dilger <adilger@....com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: EXT3 way too happy with write errors

[ You guys were on this original thread.. ]

Re: http://markmail.org/message/jcku5vo5grcjjd3s#query:+page:1+mid:ws2wkcj66ucozlnd+state:results

Maybe you could explain why on earth would you want this configurable?

I think it's a horrible idea to make the default to ignore write errors,
and still a bad idea to even make this an option.  Do people really want
data corruption and a log message rather than a a clean way to recover
from such an error, depending on the cause of it?

Aborting on data write error: User can fix why it can't write (maybe the
bus just went to lunch), remount-rw or reboot and the journal will replay
and the file system will be consistent, data and metadata, just as if the
power had failed.

Not aborting on data write error: User loses data.  File system gets very
confused.

What am I missing?

Simon-

On Thu, Dec 18, 2008 at 06:27:59PM +0100, Jan Kara wrote:

> On Thu 18-12-08 09:18:25, Simon Kirby wrote:
> 
> > Cool, but one question.. Can you think of a case where anyone would ever
> > want data_err=ignore?
> > 
> > Should this really be a knob?
>
>   Originally, we changed the behavior unconditionally but then someone came
> up with some reasonable argument why it should be tunable. I don't remember
> it exactly, sorry :).
> 
> 									Honza
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