linux-kernel - Re: [PATCH] ext3: handle corrupted orphan list at mount

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Message-ID: <20080624171856.GH9959@duck.suse.cz>
Date:	Tue, 24 Jun 2008 19:18:57 +0200
From:	Jan Kara <jack@...e.cz>
To:	Duane Griffin <duaneg@...da.com>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, sct@...hat.com, adilger@...sterfs.com,
	Sami Liedes <sliedes@...hut.fi>
Subject: Re: [PATCH] ext3: handle corrupted orphan list at mount

On Tue 24-06-08 18:16:21, Duane Griffin wrote:
> 2008/6/24 Jan Kara <jack@...e.cz>:
> >> +     /*
> >> +      * If the orphans has i_nlinks > 0 then it should be able to be
> >> +      * truncated, otherwise it won't be removed from the orphan list
> >> +      * during processing and an infinite loop will result.
> >> +      */
> >> +     if (inode->i_nlink && !ext3_can_truncate(inode))
> >> +             goto bad_orphan;
> >> +
> >  Maybe I miss something but shouldn't above rather be ||?
> 
> No, it is correct. If i_nlink == 0 the orphan will be deleted in the
> cleanup loop by the iput. If i_nlink > 0 then ext3_truncate is called,
> which usually calls ext3_orphan_del on the way out, thereby removing
> the node from the orphan list. However, if it exits too early
> (basically if the ext3_can_truncate check fails, although there are
> other failure conditions such as OOM that can also cause it to exit
> early) then it doesn't, hence we end up in the infinite loop. So the
> check here says, if this node is not going to be deleted or truncated
> then it is invalid.
  Ah, OK, I forgot that you want to handle also truncation without deletion
of the inode itself. Thanks for explanation.

									Honza

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