Re: [PATCH 1/6] block: add a bio_reuse helper

Christoph Hellwig
2018-06-13T07:32:04Z

On Tue, Jun 12, 2018 at 02:16:30AM -0400, Kent Overstreet wrote:
> On Mon, Jun 11, 2018 at 09:48:01PM +0200, Christoph Hellwig wrote:
> > This abstracts out a way to reuse a bio without destroying the
> > data pointers.
>
> What is the point of this? What "data pointers" does it not destroy?

It keeps bi_vcnt and bi_size intact in addition to bi_max_vecs/bi_io_vec
already kept by the existing bio_reset.

The befit is that you don't need to rebuild bi_vcnt, bio_io_vec and
bi_size when reusing the bio.