[PATCH for-next v5 3/4] block: add helper to map bvec iterator for passthrough

[Pankaj Raghav]

>>
>> consider this (untested), it also sets the variable i data type same
>> as it comparison variable in nr_segs the loop i.e. size_t :-
>>
>> +       struct bio_vec *bv, *bvec_arr, *bvprvp = NULL;
>> +       struct request_queue *q = rq->q;
>> +       struct queue_limits *lim = &q->limits;
>> +       unsigned int nsegs = 0, bytes = 0;
>> +       size_t iter_count, nr_segs, i;
>> +       struct bio *bio;
>> +       int ret;
>>
>>
>>> +    iter_count = iov_iter_count(iter);
>>> +    nr_segs = iter->nr_segs;
>>> +
>>> +    if (!iter_count || (iter_count >> 9) > queue_max_hw_sectors(q))
>>> +        return -EINVAL;
>>
>> can we remove braces for iter_count >> 9 without impacting the intended
>> functionality?
> 
You can also use the SECTOR_SHIFT macro instead of hard-coding 9.

> I think removing that make it hard to read.
> I will fold all other changes you mentioned in v6.
> 
>