Re: [PATCH 1/3] xfs: mark dir corrupt when lookup-by-hash fails

[Dave Chinner <david@fromorbit.com>]

On Tue, Mar 10, 2020 at 05:48:07PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
> 
> In xchk_dir_actor, we attempt to validate the directory hash structures
> by performing a directory entry lookup by (hashed) name.  If the lookup
> returns ENOENT, that means that the hash information is corrupt.  The
> _process_error functions don't catch this, so we have to add that
> explicitly.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---
>  fs/xfs/scrub/dir.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> 
> diff --git a/fs/xfs/scrub/dir.c b/fs/xfs/scrub/dir.c
> index 266da4e4bde6..ef7cc8e101ab 100644
> --- a/fs/xfs/scrub/dir.c
> +++ b/fs/xfs/scrub/dir.c
> @@ -155,6 +155,9 @@ xchk_dir_actor(
>  	xname.type = XFS_DIR3_FT_UNKNOWN;
>  
>  	error = xfs_dir_lookup(sdc->sc->tp, ip, &xname, &lookup_ino, NULL);
> +	/* ENOENT means the hash lookup failed and the dir is corrupt */
> +	if (error == -ENOENT)
> +		error = -EFSCORRUPTED;
>  	if (!xchk_fblock_process_error(sdc->sc, XFS_DATA_FORK, offset,
>  			&error))
>  		goto out;

looks good.

Reviewed-by: Dave Chinner <dchinner@redhat.com>

-- 
Dave Chinner
david@fromorbit.com