Re: [PATCH 13/13] libnvdimm, namespace: Publish page structure init state / control

[Dan Williams]

On Thu, Jul 5, 2018 at 1:29 AM, Johannes Thumshirn <jthumshirn@xxxxxxx> wrote:
> On Wed, Jul 04, 2018 at 11:50:13PM -0700, Dan Williams wrote:
>> +static ssize_t memmap_state_store(struct device *dev,
>> +             struct device_attribute *attr, const char *buf, size_t len)
>> +{
>> +     int i;
>> +     struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
>> +     struct memmap_async_state *async = &nd_pfn->async;
>> +
>> +     if (strcmp(buf, "sync") == 0)
>> +             /* pass */;
>> +     else if (strcmp(buf, "sync\n") == 0)
>> +             /* pass */;
>> +     else
>> +             return -EINVAL;
>
> Hmm what about:
>
>         if (strncmp(buf, "sync", 4))
>            return -EINVAL;
>
> This collapses 6 lines into 4.

...but that also allows 'echo "syncAndThenSomeGarbage" >
/sys/.../memmap_state' to succeed.