linux-kernel - Re: [PATCH 3.16 51/63] xfs: catch inode allocation state mismatch corruption

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Date:   Sat, 22 Sep 2018 15:25:44 +1000
From:   Dave Chinner <dchinner@...hat.com>
To:     Ben Hutchings <ben@...adent.org.uk>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        akpm@...ux-foundation.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Carlos Maiolino <cmaiolino@...hat.com>
Subject: Re: [PATCH 3.16 51/63] xfs: catch inode allocation state mismatch
 corruption

On Sat, Sep 22, 2018 at 01:15:42AM +0100, Ben Hutchings wrote:
> 3.16.58-rc1 review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Dave Chinner <dchinner@...hat.com>
> 
> commit ee457001ed6c6f31ddad69c24c1da8f377d8472d upstream.
> 
> We recently came across a V4 filesystem causing memory corruption
> due to a newly allocated inode being setup twice and being added to
> the superblock inode list twice. From code inspection, the only way
> this could happen is if a newly allocated inode was not marked as
> free on disk (i.e. di_mode wasn't zero).
....
> Signed-Off-By: Dave Chinner <dchinner@...hat.com>
> Reviewed-by: Carlos Maiolino <cmaiolino@...hat.com>
> Tested-by: Carlos Maiolino <cmaiolino@...hat.com>
> Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> [bwh: Backported to 3.16:
>  - Look up mode in XFS inode, not VFS inode
>  - Use positive error codes, and EIO instead of EFSCORRUPTED]

Why EIO?

Cheers,

Dave.
-- 
Dave Chinner
dchinner@...hat.com