On Wed, 2017-05-10 at 19:55 +0200, Christoph Hellwig wrote:
> Hi Abdul,
>
> can you test the patch below? I'll try to create a way to inject
> short WRITE SAME commands using qemu next, but I thought I'd give
> you a chance to try it as well.
No warnings with the patch. Thanks for all your support !
Reported-and-tested-by : Abdul Haleem <abdha...@linux.vnet.ibm.com>
>
> ---
> diff --git a/block/blk-core.c b/block/blk-core.c
> index c580b0138a7f..c7068520794b 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -2644,8 +2644,6 @@ bool blk_update_request(struct request *req, int error,
> unsigned int nr_bytes)
> return false;
> }
>
> - WARN_ON_ONCE(req->rq_flags & RQF_SPECIAL_PAYLOAD);
> -
> req->__data_len -= total_bytes;
>
> /* update sector only for requests with clear definition of sector */
> @@ -2658,17 +2656,19 @@ bool blk_update_request(struct request *req, int
> error, unsigned int nr_bytes)
> req->cmd_flags |= req->bio->bi_opf & REQ_FAILFAST_MASK;
> }
>
> - /*
> - * If total number of sectors is less than the first segment
> - * size, something has gone terribly wrong.
> - */
> - if (blk_rq_bytes(req) < blk_rq_cur_bytes(req)) {
> - blk_dump_rq_flags(req, "request botched");
> - req->__data_len = blk_rq_cur_bytes(req);
> - }
> + if (!(req->rq_flags & RQF_SPECIAL_PAYLOAD)) {
> + /*
> + * If total number of sectors is less than the first segment
> + * size, something has gone terribly wrong.
> + */
> + if (blk_rq_bytes(req) < blk_rq_cur_bytes(req)) {
> + blk_dump_rq_flags(req, "request botched");
> + req->__data_len = blk_rq_cur_bytes(req);
> + }
>
> - /* recalculate the number of segments */
> - blk_recalc_rq_segments(req);
> + /* recalculate the number of segments */
> + blk_recalc_rq_segments(req);
> + }
>
> return true;
> }
>
--
Regard's
Abdul Haleem
IBM Linux Technology Centre
