linux-kernel - Re: [PATCH 17/23] dm: Refactor for new bio cloning/splitting

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Date:	Tue, 29 Oct 2013 17:19:59 -0700
From:	Kent Overstreet <kmo@...erainc.com>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	axboe@...nel.dk, dm-devel@...hat.com, linux-kernel@...r.kernel.org,
	hch@...radead.org, tj@...nel.org, Alasdair Kergon <agk@...hat.com>
Subject: Re: [PATCH 17/23] dm: Refactor for new bio cloning/splitting

On Tue, Oct 29, 2013 at 08:09:08PM -0400, Mike Snitzer wrote:
> On Tue, Oct 29 2013 at  4:18pm -0400,
> Kent Overstreet <kmo@...erainc.com> wrote:
> 
> > We need to convert the dm code to the new bvec_iter primitives which
> > respect bi_bvec_done; they also allow us to drastically simplify dm's
> > bio splitting code.
> > 
> > Also kill bio_sector_offset(), dm was the only user and it doesn't make
> > much sense anymore.
> > 
> > Signed-off-by: Kent Overstreet <kmo@...erainc.com>
> > Cc: Jens Axboe <axboe@...nel.dk>
> > Cc: Alasdair Kergon <agk@...hat.com>
> > Cc: dm-devel@...hat.com
> > ---
> >  drivers/md/dm-thin.c |   8 ++-
> >  drivers/md/dm.c      | 170 ++++++---------------------------------------------
> >  fs/bio.c             |  38 ------------
> >  include/linux/bio.h  |   1 -
> >  4 files changed, 24 insertions(+), 193 deletions(-)
> > 
> > diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
> > index a654024..1abb4a2 100644
> > --- a/drivers/md/dm-thin.c
> > +++ b/drivers/md/dm-thin.c
> > @@ -611,8 +611,10 @@ static void cell_defer_no_holder(struct thin_c *tc, struct dm_bio_prison_cell *c
> >  
> >  static void process_prepared_mapping_fail(struct dm_thin_new_mapping *m)
> >  {
> > -	if (m->bio)
> > +	if (m->bio) {
> >  		m->bio->bi_end_io = m->saved_bi_end_io;
> > +		atomic_inc(&m->bio->bi_remaining);
> > +	}
> >  	cell_error(m->tc->pool, m->cell);
> >  	list_del(&m->list);
> >  	mempool_free(m, m->tc->pool->mapping_pool);
> > @@ -626,8 +628,10 @@ static void process_prepared_mapping(struct dm_thin_new_mapping *m)
> >  	int r;
> >  
> >  	bio = m->bio;
> > -	if (bio)
> > +	if (bio) {
> >  		bio->bi_end_io = m->saved_bi_end_io;
> > +		atomic_inc(&bio->bi_remaining);
> > +	}
> >  
> >  	if (m->err) {
> >  		cell_error(pool, m->cell);
> 
> But now that I look closer, the above dm-thin.c hunks belong in:
> [PATCH 19/23] block: Generic bio chaining
> 
> Seems these changes were mistakenly folded into this 17/23 patch?

...Whoops, fixed. Here's the new versions if you want to take a look:

http://evilpiepirate.org/git/linux-bcache.git/log/?h=for-jens
http://evilpiepirate.org/git/linux-bcache.git/commit/?h=for-jens&id=74f0f2084f88bb38403ca80bb98976f8219f9262
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