linux-kernel - Re: [PATCH 01/10] block: make generic_make

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Message-ID: <20150506064849.GB5181@infradead.org>
Date:	Tue, 5 May 2015 23:48:49 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lin <mlin@...nel.org>
Cc:	Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Dongsu Park <dongsu.park@...fitbricks.com>,
	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Ming Lei <ming.lei@...onical.com>, Neil Brown <neilb@...e.de>,
	Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
	Lars Ellenberg <drbd-dev@...ts.linbit.com>,
	drbd-user@...ts.linbit.com, Jiri Kosina <jkosina@...e.cz>,
	Geoff Levand <geoff@...radead.org>, Jim Paris <jim@...n.com>,
	Joshua Morris <josh.h.morris@...ibm.com>,
	Philip Kelleher <pjk1939@...ux.vnet.ibm.com>,
	Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>,
	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Keith Busch <keith.busch@...el.com>
Subject: Re: [PATCH 01/10] block: make generic_make_request handle
 arbitrarily sized bios

On Tue, May 05, 2015 at 11:08:20PM -0700, Ming Lin wrote:
> How about below incremental patch?

> -
> -		/*
> -		 * If the queue doesn't support SG gaps and adding this
> -		 * offset would create a gap, disallow it.
> -		 */
> -		if (q->queue_flags & (1 << QUEUE_FLAG_SG_GAPS) &&
> -		    bvec_gap_to_prev(prev, offset))
> -			return 0;

You need to keep the explicit checks for the BLOCK_PC case, as we can't
split those.

Otherwise it looks fine.
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