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Date: Sun, 31 Aug 2003 16:44:48 -0600
From: Andreas Dilger <adilger@clusterfs.com>
To: linux-kernel@vger.kernel.org
Subject: Re: mutt segfault with ext3 & 1k blocks & htree in 2.6
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On Aug 30, 2003  16:58 -0700, Mike Fedyk wrote:
> On Sat, Aug 30, 2003 at 01:14:21PM -0600, Andreas Dilger wrote:
> > On Aug 29, 2003  11:09 -0700, Mike Fedyk wrote:
> > > On Fri, Aug 29, 2003 at 10:24:51AM -0700, Mike Fedyk wrote:
> > >  o Find out that a directory is using htree?
> > 
> > "lsattr <dir>" will show it.  Note that it will only ever be set on
> > directories that are larger than a single disk block.
> > 
> > # lsattr -d d1
> > ----------I-- d1
> > 
> 
> Ok, now I only have htree enabled on one of my maildir folders.
> 
> > >  o Disable htree on my /?  (tune2fs -O ^dir_index), but then how do I get
> > >    my directories back to non-htree without running fsck from a rescue CD?
> > 
> > That's the great thing about htree - you don't need to do anything to turn
> > it off.  The on-disk format is exactly the same as without htree, and the
> > first time you modify the directory it will clear the per-directory htree
> > flag.
> 
> I'll do more testing to see if it fails only on that folder now.
> 
> But how do I re-enable htree on the directories (besides an fsck -D) in a
> live system?

You need to re-enable the dir_index feature, and then for directories which
are larger than a block in size you need something like:

	mkdir new_dir
	mv old_dir/* new_dir
	rmdir old_dir
	mv new_dir old_dir

The new directory will have htree enabled because it started out at 1 block
in size.

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/

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