[PATCH] xfs: fix xfs_error_get_cfg for negative errnos

[Carlos Maiolino]

On Fri, Jul 08, 2016 at 02:32:17PM -0500, Eric Sandeen wrote:
> xfs_error_get_cfg() is called with bp->b_error as an arg,
> which is negative, so the switch statement won't ever find
> any matches.
> 
> This results in only the default error handler having
> any effect, as EIO/ENOSPC/ENODEV get ignored due to the
> wrong sign.
> 
> It seems simplest to always flip the error sign to positive,
> so that we can handle either negative errors in bp->b_error,
> or possibly a positive errno via something like
> xfs_error_get_cfg(EIO) - this future-proofs the function.
> 
> Signed-off-by: Eric Sandeen <sandeen at redhat.com>

This looks the right thing to do for me too.

Reviewed-by: Carlos Maiolino <cmaiolino at redhat.com>

> ---
> 
> I'm still chasing down some odd behaviors in the error handling
> patches but this seems worth sending now :)
> 
> diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
> index 4c2c550..79cfd3f 100644
> --- a/fs/xfs/xfs_sysfs.c
> +++ b/fs/xfs/xfs_sysfs.c
> @@ -634,6 +634,9 @@ xfs_error_get_cfg(
>  {
>  	struct xfs_error_cfg	*cfg;
>  
> +	if (error < 0)
> +		error = -error;
> +
>  	switch (error) {
>  	case EIO:
>  		cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
> 
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-- 
Carlos