Re: [PATCH V10 09/19] block: introduce bio_bvecs()

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Wait, I see that the bvec is still a single array per bio. When you said
a table I thought you meant a 2-dimentional array...

I mean a new 1-d table A has to be created for multiple bios in one rq,
and build it in the following way

            rq_for_each_bvec(tmp, rq, rq_iter)
                     *A = tmp;

Then you can pass A to iov_iter_bvec() & send().

Given it is over TCP, I guess it should be doable for you to preallocate one
256-bvec table in one page for each request, then sets the max segment size as
(unsigned int)-1, and max segment number as 256, the preallocated table
should work anytime.

256 bvec table is really a lot to preallocate, especially when its not
needed, I can easily initialize the bvec_iter on the bio bvec. If this
involves preallocation of the worst-case than I don't consider this to
be an improvement.



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