Re: [PATCH 4/7] dlm: configuration

[David Teigland <teigland@redhat.com>]

On Mon, Apr 25, 2005 at 05:53:49PM +0200, Jesper Juhl wrote:
> On Mon, 25 Apr 2005, David Teigland wrote:

> > +static ssize_t dlm_id_store(struct dlm_ls *ls, const char *buf, size_t len)
> > +{
> > +	ls->ls_global_id = simple_strtol(buf, NULL, 0);
> > +	return len;
> > +}
>
> What's the point of `len' in these two functions? 
> You pass in `len`, don't use it at all, then return the value. I fail to 
> see the usefulness. Why not just have the function return void and omit 
> the `len' parameter?

Do I have a choice?  Aren't these stipulated by sysfs?

static ssize_t dlm_attr_store(struct kobject *kobj, struct attribute *attr,
                              const char *buf, size_t len)
{
        struct dlm_ls *ls  = container_of(kobj, struct dlm_ls, ls_kobj);
        struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
        return a->store ? a->store(ls, buf, len) : len;
}

static struct sysfs_ops dlm_attr_ops = {
        .show  = dlm_attr_show,
        .store = dlm_attr_store,
};

Dave