Re: [PATCH 02/13] blk: replace bioset_create_nobvec() with a flags arg to bioset_create()

From: Ming Lei
Date: Tue May 02 2017 - 05:40:39 EST

On Tue, May 02, 2017 at 01:42:24PM +1000, NeilBrown wrote:
> "flags" arguments are often seen as good API design as they allow
> easy extensibility.
> bioset_create_nobvec() is implemented internally as a variation in
> flags passed to __bioset_create().

>From driver's view, this flag has document benifit too.

> To support future extension, make the internal structure part of the
> API.
> i.e. add a 'flags' argument to bioset_create() and discard
> bioset_create_nobvec().
> Note that the bio_split allocations in drivers/md/raid* do not need
> the bvec mempool - they should have used bioset_create_nobvec().
> Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
> Signed-off-by: NeilBrown <neilb@xxxxxxxx>

Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx>