From: Jens Axboe <axboe@kernel.dk>
To: Tejun Heo <tj@kernel.org>
Cc: Asias He <asias@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Shaohua Li <shli@kernel.org>, Christoph Hellwig <hch@lst.de>,
Minchan Kim <minchan.kim@gmail.com>
Subject: Re: [PATCH RFC 1/2] block: Add blk_bio_map_sg() helper
Date: Thu, 14 Jun 2012 09:29:59 +0200 [thread overview]
Message-ID: <4FD992F7.5050800@kernel.dk> (raw)
In-Reply-To: <20120614023156.GB3766@dhcp-172-17-108-109.mtv.corp.google.com>
On 2012-06-14 04:31, Tejun Heo wrote:
> On Wed, Jun 13, 2012 at 03:41:46PM +0800, Asias He wrote:
>> Add a helper to map a bio to a scatterlist, modelled after
>> blk_rq_map_sg.
>>
>> This helper is useful for any driver that wants to create
>> a scatterlist from its ->make_request_fn method.
>
> This may not be possible but I really wanna avoid having two copies of
> that complex logic. Any chance blk_rq_map_bio() can be implemented in
> a way that allows blk_rq_map_sg() can be built on top of it? Also,
Was thinking the same thing, definitely code we don't want to have
duplicated. We've had mapping bugs in the past.
Asias, this should be trivial to do, except that blk_rq_map_sg()
potentially maps across bio's as well. The tracking of the prev bio_vec
does not care about cross bio boundaries.
--
Jens Axboe
next prev parent reply other threads:[~2012-06-14 7:30 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-13 7:41 [PATCH RFC 0/2] Improve virtio-blk performance Asias He
2012-06-13 7:41 ` [PATCH RFC 1/2] block: Add blk_bio_map_sg() helper Asias He
2012-06-14 2:31 ` Tejun Heo
2012-06-14 2:57 ` Asias He
2012-06-14 7:29 ` Jens Axboe [this message]
2012-06-14 8:19 ` Asias He
2012-06-13 7:41 ` [PATCH RFC 2/2] virtio-blk: Add bio-based IO path for virtio-blk Asias He
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