in linux raid4/5/6 ,one big bio will span several devices,and There may be several bio's per stripe+device.if the bio arrived in bi_sector with overlap,we must wait the former bio to be finished. why not we split the bigger bio into small ones?we can attach the smaller bio to the stripe+device (here we may can do some merge ).one disk i/o we can finish many small bios.if all the small bios of the request be finished ,we can return the request. - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
