[PATCH] erofs: surround fault_injection ralted option parsing using CONFIG_EROFS_FAULT_INJECTION

[gregkh@linuxfoundation.org (Greg KH)]

On Mon, Sep 10, 2018@11:45:51PM +0800, Chengguang Xu wrote:
> It's a little bit strange when fault_injection related
> option fail with -EINVAL which was already disabled
> from config, so surround all fault_injection related option
> parsing code using CONFIG_EROFS_FAULT_INJECTION. Meanwhile,
> slightly change warning message to keep consistency with
> option POSIX_ACL and FS_XATTR.
> 
> Signed-off-by: Chengguang Xu <cgxu519 at gmx.com>
> ---
>  drivers/staging/erofs/super.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c
> index 1aec509c805f..4004a00d150d 100644
> --- a/drivers/staging/erofs/super.c
> +++ b/drivers/staging/erofs/super.c
> @@ -237,16 +237,18 @@ static int parse_options(struct super_block *sb, char *options)
>  			infoln("noacl options not supported");
>  			break;
>  #endif
> +#ifdef CONFIG_EROFS_FAULT_INJECTION
>  		case Opt_fault_injection:
>  			if (args->from && match_int(args, &arg))
>  				return -EINVAL;
> -#ifdef CONFIG_EROFS_FAULT_INJECTION
>  			erofs_build_fault_attr(EROFS_SB(sb), arg);
>  			set_opt(EROFS_SB(sb), FAULT_INJECTION);
> +			break;
>  #else
> -			infoln("FAULT_INJECTION was not selected");
> -#endif
> +		case Opt_fault_injection:
> +			infoln("FAULT_INJECTION not supported");
>  			break;
> +#endif

Ugh, that's hard to read.  Why not just hide all of this crazyness
behind a single function that handles the #ifdef mess, like it should
be.  Then just always call handle_fault_injection() or whatever you want
to call it.

That makes it easier to read and understand and maintain over time.

I'll take this for now, but that should be something you work on
eventually.  For the other #ifdef options in here as well.

thanks,

greg k-h