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: <abad92af-d8b2-0488-cc75-01a3f4e8e270@acm.org>
Date:   Mon, 14 Aug 2023 07:26:44 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Nitesh Shetty <nj.shetty@...sung.com>
Cc:     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>,
        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 8/14/23 05:18, Nitesh Shetty wrote:
> On 23/08/11 02:25PM, Bart Van Assche wrote:
>> On 8/11/23 03:52, Nitesh Shetty wrote:
>>> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
>>> index 0bad62cca3d0..de0ad7a0d571 100644
>>> +static inline bool op_is_copy(blk_opf_t op)
>>> +{
>>> +    return ((op & REQ_OP_MASK) == REQ_OP_COPY_SRC ||
>>> +        (op & REQ_OP_MASK) == REQ_OP_COPY_DST);
>>> +}
>>> +
>>
>> The above function should be moved into include/linux/blk-mq.h below the
>> definition of req_op() such that it can use req_op() instead of 
>> open-coding it.
>>
> We use this later for dm patches(patch 9) as well, and we don't have 
> request at
> that time.

My understanding is that include/linux/blk_types.h should only contain
data types and constants and hence that inline functions like
op_is_copy() should be moved elsewhere.

Bart.