James.Bottomley@xxxxxxxxxxxxxxxxxxxxx wrote on Fri, 25 Jan 2008 20:05 -0600: > On Sat, 2008-01-26 at 09:57 +0900, FUJITA Tomonori wrote: > > This is against the scsi-bidi tree. > > > > We need to use the cmd_type of a leading request for scsi_init_sgtable > > to set up scsi_data_buffer:length of a bidi request properly. > > > > An alternative approach is setting the cmd_type of a leading request > > and its bidi request (*1). But the block layer and scsi-ml don't > > expect that the leading request and its sub-requests have the > > different command types. > > > > Note that scsi_debug's XDWRITEREAD_10 support is fine without this > > patch since req->nr_sectors works for it but req->nr_sectors doesn't > > work for everyone. > > > > (*1) > > > > http://www.mail-archive.com/linux-scsi@xxxxxxxxxxxxxxx/msg12669.html > > > > = > > From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> > > Subject: [PATCH] use the cmd_type of a leading request for scsi_init_sgtable > > > > We need to use the cmd_type of a leading request for scsi_init_sgtable > > to set up scsi_data_buffer:length of its bidi request properly. > > This seems to be a very convoluted work around for the fact that we > forgot to set the cmd_type on the subordinate request. > > Wouldn't this be a better fix? > > James > > --- > > diff --git a/block/bsg.c b/block/bsg.c > index 69b0a9d..8917c51 100644 > --- a/block/bsg.c > +++ b/block/bsg.c > @@ -279,6 +279,7 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) > goto out; > } > rq->next_rq = next_rq; > + next_rq->cmd_type = rq->cmd_type; > > dxferp = (void*)(unsigned long)hdr->din_xferp; > ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len); > > Agree. I did essentially the same thing in: http://marc.info/?l=linux-scsi&m=119835555623270 Tomo, you may want to have a look at all the bsg patches I sent back in Dec 2007. Boaz has the minimum required for bidi in his tree. There are a few more here too, if you want to see what we need for OSD: http://git.osc.edu/?p=linux.git;a=summary -- Pete - 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
