This builds off of immutable biovecs; it's a small enough patch series that I'd like to try to get it into 3.14 but it is a pretty significant change in behaviour for the block layer so it should definitely be considered separately from that series. What the series does is pretty simple - like the title says, you can now pass generic_make_request arbitrary size bios - you no longer have to care about device limits, and we can start deleting a ton of code. This is done by splitting bios as needed. The idea is to push the splitting lower and lower over time, and in many cases we eventually won't have to actually split the bios at all - it'll happen implicitly - for now though, we do it the simple easy way, with a new function (blk_queue_split()) that mimics the old behaviour of bio_add_page(). This series only starts with the obvious easy things - bio_add_page(), and the stuff in blk-lib.c. There's a lot more coming - with the new bio_split() that can split arbitrary size bios the various virtual block drivers (md, dm, drbd, etc.) should all either be capable of handling arbitrary size bios now or mostly need minor changes, so we can delete merge_bvec_fn. This patch series doesn't with REQ_TYPE_BLOCK_PC bios - bio_add_pc_page() and the blk_execute_rq() codepath are unchanged. I'd like to get rid of direct request submission eventually, but that is a different patch series. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
