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    SubjectRe: [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)

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