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

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Date:	Sat, 8 Aug 2015 01:02:05 -0800
From:	Kent Overstreet <kent.overstreet@...il.com>
To:	Hannes Reinecke <hare@...e.de>
Cc:	device-mapper development <dm-devel@...hat.com>,
	Christoph Hellwig <hch@....de>, Neil@...hat.com,
	Mike Snitzer <snitzer@...hat.com>,
	Ming Lei <ming.lei@...onical.com>, Al@...hat.com,
	Alasdair Kergon <agk@...hat.com>,
	Lars Ellenberg <drbd-dev@...ts.linbit.com>,
	Philip Kelleher <pjk1939@...ux.vnet.ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Nitin Gupta <ngupta@...are.org>,
	Ming Lin <ming.l@....samsung.com>,
	Oleg Drokin <oleg.drokin@...el.com>,
	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
Subject: Re: [dm-devel] [PATCH v5 01/11] block: make generic_make_request
 handle arbitrarily sized bios

On Sat, Aug 08, 2015 at 10:52:24AM +0200, Hannes Reinecke wrote:
> Wouldn't it be easier to move both max_write_same_sectors and
> max_discard sectors to 64 bit (ie to type sector_t) and be done with the
> overflow?
> Seems to me this is far too much coding around self-imposed restrictions...

It's bio->bi_iter.bi_size that would have to be increased to 64 bits. Which I
suppose wouldn't actually increase the size of struct bio (when sector_t is 64
bits), since struct bvec_iter has padding right now...
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