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)
>