linux-kernel - Re: warn on lookup_one_length/vfs_quota_on

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Message-ID: <20091112162026.GJ14528@duck.suse.cz>
Date:	Thu, 12 Nov 2009 17:20:26 +0100
From:	Jan Kara <jack@...e.cz>
To:	Bastien ROUCARIES <roucaries.bastien@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Jan Kara <jack@...e.cz>
Subject: Re: warn on lookup_one_length/vfs_quota_on_mount

  Hello,

On Thu 12-11-09 13:42:38, Jan Kara wrote:
> On Thu 12-11-09 08:29:06, Bastien ROUCARIES wrote:
> > I get the following warm on my reiserfs disk with quota enabled at
> > boot (each boot) see
> > http://www.kerneloops.org/raw.php?rawid=937752&msgid=
> > *lookup_one_len
> > ? lookup_one_len
> > ? lookup_one_len
> > ? warn_slowpath_common
> > ? lookup_one_len
> > ? vfs_quota_on_mount
> > ? finish_unfinished
> > ? reiserfs_remount
> > ? __filemap_fdatawrite_range
> > ? do_remount_sb
> > ? do_mount
> > ? sys_mount
> > ? system_call_fastpath
> > 
> > But it seems a generic bug in the quota layer due to:
> > http://www.kerneloops.org/oops.php?number=799645
> > http://www.kerneloops.org/oops.php?number=700122
>   OK, this shouldn't lead to any real bug (since we look them up during
> filesystem mount or remount read-write when noone can mess with the root
> directory). But it's probably good to silence the warning by proper locking
> anyway. I'll do it. Thanks for the report!
  Attached patch fixes the warning for me.

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR

View attachment "0001-quota-Fix-WARN_ON-in-lookup_one_len.patch" of type "text/x-patch" (1214 bytes)