linux-kernel - Re: [PATCH 02/13] blk: replace bioset_create_nobvec() with a flags arg to bioset

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Message-ID: <20170502094019.GA1803@ming.t460p>
Date:   Tue, 2 May 2017 17:40:21 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     NeilBrown <neilb@...e.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Ming Lei <tom.leiming@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/13] blk: replace bioset_create_nobvec() with a flags
 arg to bioset_create()

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@...radead.org>
> Signed-off-by: NeilBrown <neilb@...e.com>

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

Thanks,
Ming