From: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
Subject: [PATCH 4/4] bidi support: bidirectional request
Date: Sun, 15 Apr 2007 20:33:28 +0300
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 645d24b..16a02ee 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -322,6 +322,7 @@ struct request {
> void *end_io_data;
>
> struct request_io_part uni;
> + struct request_io_part bidi_read;
> };
Would be more straightforward to have:
struct request_io_part in;
struct request_io_part out;
> /*
> @@ -600,6 +601,34 @@ static inline struct request_io_part* rq_uni(struct request* req)
> return &req->uni;
> }
>
> +static inline struct request_io_part* rq_out(struct request* req)
> +{
> + WARN_ON_BIDI_FLAG(req);
> + return &req->uni;
> +}
> +
> +static inline struct request_io_part* rq_in(struct request* req)
> +{
> + WARN_ON_BIDI_FLAG(req);
> + if (likely(rq_dma_dir(req) != DMA_BIDIRECTIONAL))
> + return &req->uni;
> +
> + if (likely(req->cmd_flags & REQ_BIDI))
> + return &req->bidi_read;
> +
> + return &req->uni;
> +}
> +
> +static inline struct request_io_part* rq_io(struct request* req,
> + enum dma_data_direction dir)
> +{
> + if (dir == DMA_FROM_DEVICE)
> + return rq_in(req);
> +
> + WARN_ON( (dir != DMA_TO_DEVICE) && (dir != DMA_NONE) );
> + return &req->uni;
> +}
static inline struct request_io_part* rq_io(struct request* req)
{
return (req is WRITE) ? &req->out : &req->in;
}
-
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