[PATCH 2/4] fs: Prevent doing FALLOC_FL_ZERO_RANGE on append only file

[Christoph Hellwig]

On Fri, Apr 11, 2014 at 08:57:43PM +0200, Lukas Czerner wrote:
>  	/*
> -	 * It's not possible to punch hole or perform collapse range
> -	 * on append only file
> +	 * It's not possible to punch hole, perform collapse range
> +	 * or zero range on append only file
>  	 */
> -	if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE)
> +	if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
> +		    FALLOC_FL_ZERO_RANGE)

Might be better to make this a negative test fo the operation that is
allowed on an appen only file.  That's also much better future proof.