linux-kernel - Re: [patch 01/45] XFS: corruption fix

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Message-ID: <20060719082458.A1935136@wobbly.melbourne.sgi.com>
Date:	Wed, 19 Jul 2006 08:24:59 +1000
From:	Nathan Scott <nathans@....com>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	stable@...nel.org, Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>, torvalds@...l.org,
	akpm@...l.org, alan@...rguk.ukuu.org.uk,
	Mandy Kirkconnell <alkirkco@....com>,
	Chris Wright <chrisw@...s-sol.org>, xfs@....sgi.com
Subject: Re: [patch 01/45] XFS: corruption fix

On Tue, Jul 18, 2006 at 03:27:37PM +0200, Jan Engelhardt wrote:
> >
> >Fix nused counter.  It's currently getting set to -1 rather than getting
> >decremented by 1.  Since nused never reaches 0, the "if (!free->hdr.nused)"
> >check in xfs_dir2_leafn_remove() fails every time and xfs_dir2_shrink_inode()
> >doesn't get called when it should.  This causes extra blocks to be left on
> >an empty directory and the directory in unable to be converted back to
> >inline extent mode.
> >
> Is there a utility to fix such directories or will they autoshrink once the fs
> is run with a 2.6.17.7?

An xfs_repair is required.  There is a remaining issue with repair
where it cannot resolve some particular types of directory trashing,
but for the most part I believe xfs_repair will resolve this (please
report if not).  We're working on improving the way xfs_repair deals
with dir2 corruption atm, so this remaining problem (that funky dir2
offset problem, iow) I expect will shortly be resolved.

cheers.

-- 
Nathan
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