Re: reiser4 plugins

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On Sun, 26 Jun 2005, Alan Cox wrote:

On Gwe, 2005-06-24 at 20:21, Hans Reiser wrote:
Alan, this is FUD.   Our V3 fsck was written after everything else was,
for lack of staffing reasons (why write an fsck before you have an FS
worth using).  As a result, there was a long period where the fsck code
was unstable.  It is reliable now.

People often think that our tree makes fsck less robust.  Actually fsck
can throw the entire internal tree away and rebuild from leaf nodes, and
frankly that makes things pretty robust.

I did a series of tests well after resier3 had fsck that consisted of
modelling the behaviour of systems under error state. I modelled random
bit errors, bit errors at a fixed offset (class ram failure), sector 4
byte slip (known IDE fail case) and sectors going away.

Reiserfs didn't handle it anything like as gracefully as ext2. Its a
pretty easy experiment to write the code for and the results are
interesting.

Maybe but I once checked some other error scenario. I generated (by mistake of course) dm table that lineary connected 3 times the same partition (instead of 3 different partitions). Both Reiser4 and Reiserfs3 gave a lot of errors while trying to use such device. Ext3 did not give single error and was hapily droping my data,

I agree that this is not very useful test case for disk problems but it shows that, at least, checks for trouble in Reiser4 are miles before those in Ext2/3. If only Reiser4 could print a note what I done wrong... ;-)


Grzegorz Kulewski
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