On Fri, 2013-11-29 at 16:42 +0800, majianpeng wrote:
> Make scsi-mq support blk-pc-command.
>
> Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx>
> ---
> drivers/scsi/scsi_lib.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index bed596e..679e840 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -1059,9 +1059,11 @@ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
> /*
> * Use pre-allocation of cmd->sdb scatterlists with scsi-mq..
> */
> -//FIXME: scsi-mq dif descriptor init within scsi_init_io
> if (rq->mq_ctx) {
> BUG_ON(rq->nr_phys_segments > SCSI_MAX_SG_SEGMENTS);
> + cmd->sdb.table.sgl = cmd->mq_sgl;
> + cmd->sdb.table.nents = rq->nr_phys_segments;
> + sg_init_table(cmd->sdb.table.sgl, rq->nr_phys_segments);
> scsi_init_sgtable(rq, &cmd->sdb);
> return BLKPREP_OK;
> }
Doesn't seem to be necessary for TYPE_ROM either..?
So requests of REQ_TYPE_BLOCK_PC for TYPE_ROM with scsi-mq are having
their sc->sdb.table setup from pre-allocated SGLs at the start of
scsi_mq_queue_rq(), before q->prep_rq_fn() -> sr_prep_fn() ->
scsi_setup_blk_pc_cmnd() is called.
--nab
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