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Date: Wed, 6 May 2015 00:13:14 -0700
Message-ID: <CAF1ivSZKSEfvXg_EUWkxkigLPVZNxQ0uEY7kns8CfE=nfLrCoQ@mail.gmail.com>
Subject: Re: [PATCH 01/10] block: make generic_make_request handle arbitrarily
 sized bios
From: Ming Lin <mlin@kernel.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Ming Lin <mlin@kernel.org>, Christoph Hellwig <hch@lst.de>,
        lkml <linux-kernel@vger.kernel.org>, Jens Axboe <axboe@kernel.dk>,
        Kent Overstreet <kent.overstreet@gmail.com>,
        Dongsu Park <dongsu.park@profitbricks.com>,
        Al Viro <viro@zeniv.linux.org.uk>, Ming Lei <ming.lei@canonical.com>,
        Neil Brown <neilb@suse.de>, Alasdair Kergon <agk@redhat.com>,
        Mike Snitzer <snitzer@redhat.com>, dm-devel@redhat.com,
        Lars Ellenberg <drbd-dev@lists.linbit.com>, drbd-user@lists.linbit.com,
        Jiri Kosina <jkosina@suse.cz>, Geoff Levand <geoff@infradead.org>,
        Jim Paris <jim@jtan.com>, Joshua Morris <josh.h.morris@us.ibm.com>,
        Philip Kelleher <pjk1939@linux.vnet.ibm.com>,
        Minchan Kim <minchan@kernel.org>, Nitin Gupta <ngupta@vflare.org>,
        Oleg Drokin <oleg.drokin@intel.com>,
        Andreas Dilger <andreas.dilger@intel.com>,
        Keith Busch <keith.busch@intel.com>
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On Tue, May 5, 2015 at 11:48 PM, Christoph Hellwig <hch@infradead.org> wrote:
> 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.

I'll keep it. Thanks.

>
> Otherwise it looks fine.
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