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Date:   Mon, 14 Aug 2023 07:26:44 -0700
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Subject: Re: [dm-devel] [PATCH v14 02/11] Add infrastructure for copy offload
 in block and request layer.
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To:     Nitesh Shetty <nj.shetty@samsung.com>
Cc:     Jens Axboe <axboe@kernel.dk>, Jonathan Corbet <corbet@lwn.net>,
        Alasdair Kergon <agk@redhat.com>,
        Mike Snitzer <snitzer@kernel.org>, dm-devel@redhat.com,
        Keith Busch <kbusch@kernel.org>,
        Christoph Hellwig <hch@lst.de>,
        Sagi Grimberg <sagi@grimberg.me>,
        Chaitanya Kulkarni <kch@nvidia.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Christian Brauner <brauner@kernel.org>,
        martin.petersen@oracle.com, linux-doc@vger.kernel.org,
        gost.dev@samsung.com, Anuj Gupta <anuj20.g@samsung.com>,
        linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
        linux-block@vger.kernel.org, mcgrof@kernel.org, dlemoal@kernel.org,
        linux-fsdevel@vger.kernel.org
References: <20230811105300.15889-1-nj.shetty@samsung.com>
 <CGME20230811105648epcas5p3ae8b8f6ed341e2aa253e8b4de8920a4d@epcas5p3.samsung.com>
 <20230811105300.15889-3-nj.shetty@samsung.com>
 <3b1da341-1c7f-e28f-d6aa-cecb83188f34@acm.org>
 <20230814121853.ms4acxwr56etf3ph@green245>
From:   Bart Van Assche <bvanassche@acm.org>
In-Reply-To: <20230814121853.ms4acxwr56etf3ph@green245>
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Precedence: bulk

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.