linux-kernel - Re: [PATCH v5 01/11] block: make generic_make

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Date:	Mon, 10 Aug 2015 11:02:17 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Ming Lin <mlin@...nel.org>, axboe@...com
Cc:	Christoph Hellwig <hch@...radead.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	device-mapper development <dm-devel@...hat.com>,
	Ming Lei <ming.lei@...onical.com>,
	Christoph Hellwig <hch@....de>,
	Alasdair Kergon <agk@...hat.com>,
	Lars Ellenberg <drbd-dev@...ts.linbit.com>,
	Philip Kelleher <pjk1939@...ux.vnet.ibm.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Nitin Gupta <ngupta@...are.org>,
	Ming Lin <ming.l@....samsung.com>,
	Oleg Drokin <oleg.drokin@...el.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Jens Axboe <axboe@...nel.dk>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Geoff Levand <geoff@...radead.org>,
	Jiri Kosina <jkosina@...e.cz>,
	lkml <linux-kernel@...r.kernel.org>, Jim Paris <jim@...n.com>,
	Minchan Kim <minchan@...nel.org>,
	Dongsu Park <dpark@...teo.net>, drbd-user@...ts.linbit.com,
	Joe Thornber <ejt@...hat.com>
Subject: Re: [PATCH v5 01/11] block: make generic_make_request handle
 arbitrarily sized bios

On Sun, Aug 09 2015 at  3:18am -0400,
Ming Lin <mlin@...nel.org> wrote:

> On Sun, 2015-08-09 at 00:01 -0700, Christoph Hellwig wrote:
> > On Sat, Aug 08, 2015 at 11:55:47PM -0700, Ming Lin wrote:
> > > Will change it to MAX_BIO_SECTORS.
> > > May I add your ACK?
> > 
> > Yes, please go ahead.
> 
> Thanks. I'll send a new version of the series once device-mapper guy
> acks.
> 
> Hi Mike,
> 
> I have updated my tree. Could you pull and re-test?
> https://git.kernel.org/cgit/linux/kernel/git/mlin/linux.git/log/?h=block-generic-req
> 
> The 2 thin-provisioning tests passed.

I've merged your latest branch with my dm-4.3 branch, I had one conflict
in the merge due to the dm_merge_bvec() change from 4.2-rc6 (no
surprise).  I've published the result here:
http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=block-late-bio-splitting

It passes the device-mapper-test-suite's 'thin-provisioning' tests.

> Hope I can have your ACK soon.

Shouldn't we also be using MAX_BIO_SECTORS in blkdev_issue_write_same
(instead of UINT_MAX >> 9)?

Aside from that, I'm in favor of seeing this late bio splitting patchset
finally land upstream (hopefully in time for the 4.3 merge, Jens?):

Acked-by: Mike Snitzer <snitzer@...hat.com>

p.s. I'll be working with Joe Thornber on optimizing DM (particularly
dm-thinp and dm-cache) once this patchset is included upstream.  You'll
see I've already added a couple WIP dm-thinp patches ontop.
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