linux-kernel - Re: [PATCH 06/20] block: Bring back zero_fill_bio

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Message-ID: <20230725024553.bqwoyz4ywqx6fypb@moria.home.lan>
Date:   Mon, 24 Jul 2023 22:45:53 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-bcachefs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Kent Overstreet <kent.overstreet@...il.com>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org
Subject: Re: [PATCH 06/20] block: Bring back zero_fill_bio_iter

On Mon, Jul 24, 2023 at 10:35:45AM -0700, Christoph Hellwig wrote:
> On Wed, Jul 12, 2023 at 05:11:01PM -0400, Kent Overstreet wrote:
> > From: Kent Overstreet <kent.overstreet@...il.com>
> > 
> > This reverts 6f822e1b5d9dda3d20e87365de138046e3baa03a - this helper is
> > used by bcachefs.
> > 
> > Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
> > Cc: Jens Axboe <axboe@...nel.dk>
> > Cc: linux-block@...r.kernel.org
> > ---
> >  block/bio.c         | 6 +++---
> >  include/linux/bio.h | 7 ++++++-
> >  2 files changed, 9 insertions(+), 4 deletions(-)
> 
> I really don't see any point in offering this in the block layer.  By
> the lack of any other caller it obviously isn't such a generic and
> always used helper, but more importantly it literally is three lines
> of code to implement it.

And yet, we've had a subtle bug introduced in that code that took quite
awhile to be fixed - I'm not pro code duplication in general and I don't
think this is a good place to start.