/** * blk_rq_map_pages - Receives an array of pages and appends them to a request structure * * @rq: The request to map * @pages_info: A structure that specifies the array of pages, offset and more that need to be * map to the request. the @pages_info->null_mapped is assumed to be 1 and is ignored. * @length: Total bytes to map. Array of pages can be larger, stop mapping after @length bytes mapped. * @max_pages: When allocating the internal bio use @max_pages as an hint that says the amount of anticipated * pages that will be mapped. This member is optional and can be zero. * * blk_rq_map_pages can be called multiple times so the user does not need to allocate a contiguous array * of struct page pointers but can call this routine multiple times. In that case max_pages can be set * so no bio re-allocation occurs. * There is no unmap function for this mapping, the request is completed in the regular way. */ int blk_rq_map_pages(struct request rq, struct *rq_map_data pages_info, unsigned length, unsigned max_pages); Implementation comments: - Then when this member is available many places that call blk_rq_map_user() rq_map_data and null_mapped set, and buff == NULL, can be converted to this member. - Internal block implementation is refactored to not duplicate any code with blk_rq_map_user(). Thanks for any comments Boaz -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
