Re: [PATCH 06/20] block: Bring back zero_fill_bio_iter

[Kent Overstreet]

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@xxxxxxxxx>
> > 
> > This reverts 6f822e1b5d9dda3d20e87365de138046e3baa03a - this helper is
> > used by bcachefs.
> > 
> > Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
> > Cc: Jens Axboe <axboe@xxxxxxxxx>
> > Cc: linux-block@xxxxxxxxxxxxxxx
> > ---
> >  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.