Re: I request inclusion of reiser4 in the mainline kernel

Hans Reiser
2005-09-21T00:13:31Z

Thanks Ted, I'll ask Vitaly to read the paper, and tell us what he
thinks should be learned from it for V4.

Hans

Theodore Ts'o wrote:

>On Tue, Sep 20, 2005 at 09:51:33AM +0200, Pavel Machek wrote:
>
>
>>Do you have working fsck for V4? Until then, you should not claim that
>>users should switch. Journalling does not help you, if you have
>>unexpected kernel problem or hardware trouble, fsck _is_ mandatory.
>>
>>Can V4 survive few hours of test below?
>>
>>
>
>The script could be improved by select random locations to damage the
>filesystem, instead of hard-coding the seek=7 value. Seek=7 is good
>for testing ext2/ext3 filesystems, but it may not be ideal for other
>filesystems.
>
>Another interesting refinement would be to analyze the resulting
>filesystem after it has been repaired to determine how much data could
>be salvaged by the fsck program.
>
>There is a very interesting paper that I coincidentally just came
>across today that talks about making filesystems robust against
>various different forms of failures of modern disk systems. It is
>going to be presented at the upcoming 2005 SOSP conference.
>
> http://www.cs.wisc.edu/adsl/Publications/iron-sosp05.pdf
>
>It's definitely worth a read. A few comments about it; first of all,
>I know nothing about this modified "iron ext3" (ixt3) discussed in the
>paper aside from what's the paper itself. It would be interesting to
>see what they have done with it. Secondly, I _think_ sct has already
>fixed the problems discussed in the paper with respect to inadequate
>write squelching after an I/O failure writing to the ext3 journal, but
>we need to chat with the paper's authors to confirm that, and if there
>still is a problem, obviously we need to fix it. Third of all, I'll
>note that the paper does takes an approving note of the fact that
>Reiserfs (v3) always panic's when it detects a write fault, so for
>those folks in the Reiser team who might have a persecution complex,
>relax, the whole world isn't out to get you. :-)
>
> - Ted
>
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