> +/* > + * @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)
