linux-kernel - Re: [dm-devel] [PATCH v14 02/11] Add infrastructure for copy offload in block and request layer.

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Message-ID: <355bb623-9cd9-fe33-106e-1f091c09fb32@acm.org>
Date:   Fri, 11 Aug 2023 14:58:36 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Nitesh Shetty <nj.shetty@...sung.com>,
        Jens Axboe <axboe@...nel.dk>, Jonathan Corbet <corbet@....net>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>, dm-devel@...hat.com,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>
Cc:     martin.petersen@...cle.com, linux-doc@...r.kernel.org,
        gost.dev@...sung.com, Anuj Gupta <anuj20.g@...sung.com>,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, mcgrof@...nel.org, dlemoal@...nel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [dm-devel] [PATCH v14 02/11] Add infrastructure for copy offload
 in block and request layer.

On 8/11/23 03:52, Nitesh Shetty wrote:
> We expect caller to take a plug and send bio with source information,
> followed by bio with destination information.
> Once the src bio arrives we form a request and wait for destination
> bio. Upon arrival of destination we merge these two bio's and send
> corresponding request down to device driver.

Is the above description up-to-date? In the cover letter there is a 
different description of how copy offloading works.

Thanks,

Bart.