linux-kernel - Re: [Bcache v13 14/16] bcache: Request, io and allocation code

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Message-ID: <20120523042426.GD607@dhcp-172-18-216-138.mtv.corp.google.com>
Date:	Wed, 23 May 2012 00:24:26 -0400
From:	Kent Overstreet <koverstreet@...gle.com>
To:	Tejun Heo <tejun@...gle.com>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, agk@...hat.com
Subject: Re: [Bcache v13 14/16] bcache: Request, io and allocation code

On Tue, May 22, 2012 at 03:42:55PM -0700, Tejun Heo wrote:
> On Wed, May 09, 2012 at 11:11:25PM -0400, Kent Overstreet wrote:
> > +int submit_bbio_split(struct bio *bio, struct cache_set *c,
> > +		      struct bkey *k, unsigned ptr)
> > +{
> > +	struct closure *cl = bio->bi_private;
> > +	struct bbio *b;
> > +	struct bio *n;
> > +	unsigned sectors_done = 0;
> > +
> > +	closure_get(cl);
> > +
> > +	bio->bi_sector	= PTR_OFFSET(k, ptr);
> > +	bio->bi_bdev	= PTR_CACHE(c, k, ptr)->bdev;
> > +
> > +	do {
> > +		n = bio_split_get(bio, bio_max_sectors(bio), c);
> > +		if (!n) {
> > +			closure_put(cl);
> > +			return -ENOMEM;
> > +		}
> > +
> > +		b = container_of(n, struct bbio, bio);
> > +
> > +		bkey_copy_single_ptr(&b->key, k, ptr);
> > +		SET_KEY_SIZE(&b->key, KEY_SIZE(k) - sectors_done);
> > +		SET_PTR_OFFSET(&b->key, 0, PTR_OFFSET(k, ptr) + sectors_done);
> > +
> > +		b->submit_time_us = local_clock_us();
> > +		generic_make_request(n);
> > +	} while (n != bio);
> > +
> > +	return 0;
> > +}
> 
> Hmmm... where is @sectors_done updated?

That's a bug - thanks!
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