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

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Date:	Sat, 8 Aug 2015 23:41:28 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lin <mlin@...nel.org>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Mike Snitzer <snitzer@...hat.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>,
	Joshua Morris <josh.h.morris@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	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
Subject: Re: [dm-devel] [PATCH v5 01/11] block: make generic_make_request
 handle arbitrarily sized bios

On Sat, Aug 08, 2015 at 10:59:50PM -0700, Ming Lin wrote:
> +/*
> + * Ensure that max discard sectors doesn't overflow bi_size and hopefully
> + * it is of the proper granularity as long as the granularity is a power
> + * of two.
> + */
> +#define MAX_DISCARD_SECTORS ((1U << 31) >> 9)

Thisn't isn't MAX_DISCARD_SECTORS, it's MAX_BIO_SECTORS.  If we ever
to something like Kent's multipage biovecs we'll actually need it for
regular read/write bios in addition to discard and write same.

Except for that the patch looks reasonable to me.
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