linux-kernel - Re: [PATCH 2/2] block: defer the use of inline biovecs for discard requests

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Message-ID: <20100628124548.GC19497@redhat.com>
Date:	Mon, 28 Jun 2010 08:45:48 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Christoph Hellwig <hch@....de>, dm-devel@...hat.com,
	James.Bottomley@...e.de, linux-kernel@...r.kernel.org,
	martin.petersen@...cle.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 2/2] block: defer the use of inline biovecs for discard
 requests

On Mon, Jun 28 2010 at  8:41am -0400,
Jens Axboe <axboe@...nel.dk> wrote:

> On 2010-06-28 14:37, Mike Snitzer wrote:
> > On Mon, Jun 28 2010 at  8:34am -0400,
> > Jens Axboe <axboe@...nel.dk> wrote:
> > 
> >> On 2010-06-26 21:56, Mike Snitzer wrote:
> >>> Don't alloc discard bio with a biovec in blkdev_issue_discard.  Doing so
> >>> means bio_has_data() will not be true until the SCSI layer adds the
> >>> payload to the discard request via blk_add_request_payload.
> >>
> >> Sorry, this looks horrible.
> > 
> > Your judgment isn't giving me much to work with... not sure where I go
> > with "horrible".
> 
> The horrible part is working around that issue by fiddling with the
> assignment of the internal vec. THAT looks like a horrible solution
> to that problem.
>
> How about just adding a check to bio_has_data() for non-zero
> bio->bi_vcnt?

Sure, that works.
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