linux-kernel - Re: [patch 1/2]block: handle merged discard request

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Message-ID: <20120820141229.GC28570@redhat.com>
Date:	Mon, 20 Aug 2012 10:12:29 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Shaohua Li <shli@...nel.org>, Vivek Goyal <vgoyal@...hat.com>,
	axboe@...nel.dk, linux-kernel@...r.kernel.org, neilb@...e.de,
	linux-scsi@...r.kernel.org
Subject: Re: [patch 1/2]block: handle merged discard request

On Mon, Aug 20 2012 at  9:58am -0400,
Christoph Hellwig <hch@...radead.org> wrote:

> On Mon, Aug 20, 2012 at 09:57:39AM -0400, Mike Snitzer wrote:
> > But I haven't put my finger on _why_ a discard bio has bio->bi_io_vec
> > (but given my use of DM, bio comes from bio_alloc_bioset, and DM passes
> > original bio->bi_max_vecs for nr_iovecs).
> 
> TRIM has a payload and we cheay by preallocation a data page for it.

Thought we pushed that down?  Hence sd_setup_discard_cmnd's
alloc_page + blk_add_request_payload hack.
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