From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Mason <mason@suse.com>
Subject: Re: Data loss during power off
Date: 27 Jun 2002 10:53:37 -0400
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To: Henrique Faria <henrique@streamworks.com.br>
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On Tue, 2002-06-25 at 17:09, Henrique Faria wrote:
> Hello!
> We're using reiserfs 3.6.25 and linux 2.4.18, in a 256 MB flash memory card,
> to develop a game. Data is written all the time, in local files, by the main
> process. The "power off" test has to be done, for the machines will be
> turned off with no shutdown process.
> What's happening: pressing the power off button (during data writing) makes
> data to be lost. Is it possible to force the data to be written in the file
> system? I tried to change the JOURNAL_MAX_TRANS_AGE and the
> JOURNAL_MAX_COMMIT_AGE consts. Less data is lost, but I still get some loss.
> Thanks,

The data logging patches also include data=ordered mode.  Using that,
plus setting the max trans age (or max batch count), will flush data
blocks right away.

I'm waiting for a tester to confirm I've fixed the page locking problem
w/writepage in the current data logging patch, then I'll do a new
release.

-chris