On Mon, 07 Apr 2008 20:31:38 +0900 Tejun Heo <htejun@xxxxxxxxx> wrote: > FUJITA Tomonori wrote: > >> Maybe we need yet another flag indicating padding space > >> availability? > > > > How about doing the exact same thing that the drain buffer does? We > > can put pre-allocated buffer to a queue and save one sg entry for it. > > Each sg entry should be aligned so extra sg doesn't really help or am I > missing something? Sorry, please scratch the previous mail. I think that I misunderstood what you meant. The current code does padding only for requests that we call __blk_rq_map_user (bio_copy_user) for. You meant that if we create a new flag like REQ_NEED_PADDING and set it in blk_rq_map_user, blk_rq_map_sg can do padding only when it was set. Right? -- 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
