linux-kernel - Re: [PATCH v7 2/8] block: Add copy offload support infrastructure

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Message-ID: <Y/VapDeE98+A6/G2@minwoo-desktop>
Date:   Wed, 22 Feb 2023 08:58:28 +0900
From:   Minwoo Im <minwoo.im.dev@...il.com>
To:     Nitesh Shetty <nj.shetty@...sung.com>
Cc:     Jens Axboe <axboe@...nel.dk>, 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>,
        James Smart <james.smart@...adcom.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Alexander Viro <viro@...iv.linux.org.uk>, bvanassche@....org,
        hare@...e.de, ming.lei@...hat.com,
        damien.lemoal@...nsource.wdc.com, anuj20.g@...sung.com,
        joshi.k@...sung.com, nitheshshetty@...il.com, gost.dev@...sung.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v7 2/8] block: Add copy offload support infrastructure

> +/*
> + * @bdev_in:	source block device
> + * @pos_in:	source offset
> + * @bdev_out:	destination block device
> + * @pos_out:	destination offset

@len is missing here.

> + * @end_io:	end_io function to be called on completion of copy operation,
> + *		for synchronous operation this should be NULL
> + * @private:	end_io function will be called with this private data, should be
> + *		NULL, if operation is synchronous in nature
> + * @gfp_mask:   memory allocation flags (for bio_alloc)
> + *
> + * Returns the length of bytes copied or a negative error value
> + *
> + * Description:
> + *	Copy source offset from source block device to destination block
> + *	device. length of a source range cannot be zero. Max total length of
> + *	copy is limited to MAX_COPY_TOTAL_LENGTH
> + */
> +int blkdev_issue_copy(struct block_device *bdev_in, loff_t pos_in,
> +		      struct block_device *bdev_out, loff_t pos_out, size_t len,
> +		      cio_iodone_t end_io, void *private, gfp_t gfp_mask)