linux-kernel - Re: [RFC PATCH v5 0/4] add simple copy support

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Message-ID: <BYAPR04MB4965A79071C8DC9DA9D49FC8864F9@BYAPR04MB4965.namprd04.prod.outlook.com>
Date:   Tue, 13 Apr 2021 18:36:21 +0000
From:   Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
To:     Javier González <javier@...igon.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>
CC:     SelvaKumar S <selvakuma.s1@...sung.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        Damien Le Moal <Damien.LeMoal@....com>,
        "kch@...nel.org" <kch@...nel.org>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "snitzer@...hat.com" <snitzer@...hat.com>,
        "selvajove@...il.com" <selvajove@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nj.shetty@...sung.com" <nj.shetty@...sung.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        "joshi.k@...sung.com" <joshi.k@...sung.com>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "joshiiitr@...il.com" <joshiiitr@...il.com>,
        "hch@....de" <hch@....de>
Subject: Re: [RFC PATCH v5 0/4] add simple copy support

On 4/13/21 11:26, Javier González wrote:
>>> I believe there is space for extensions to simple copy. But given the
>>> experience with XCOPY, I can imagine that changes will be incremental,
>>> based on very specific use cases.
>>>
>>> I think getting support upstream and bringing deployed cases is a very
>>> good start.
>> Copying data (files) within the controller/subsystem from ns_A to ns_B 
>> using NVMf will reduce network BW and memory BW in the host server.
>>
>> This feature is well known and the use case is well known.
> Definitely.
>

I've a working code for nvmet for simple copy, I'm waiting to resolve
the host interface for REQ_OP_COPY so I can post it with this series.

Let me know if someone wants to collaborate offline on that.

IMHO we first need to sort out the host side interface which is
a challenge for years and it is not that easy to get it right
based on the history.