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

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Date:   Wed, 22 Feb 2023 11:42:36 +0530
From:   Nitesh Shetty <nj.shetty@...sung.com>
To:     Minwoo Im <minwoo.im.dev@...il.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

On Wed, Feb 22, 2023 at 08:58:28AM +0900, Minwoo Im wrote:
> > +/*
> > + * @bdev_in:	source block device
> > + * @pos_in:	source offset
> > + * @bdev_out:	destination block device
> > + * @pos_out:	destination offset
> 
> @len is missing here.
> 

acked

> > + * @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)
>