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Message-ID: <475BB8C3.9040700@panasas.com>
Date: Sun, 09 Dec 2007 11:43:31 +0200
From: Boaz Harrosh <bharrosh@...asas.com>
To: Kiyoshi Ueda <k-ueda@...jp.nec.com>
CC: jens.axboe@...cle.com, linux-kernel@...r.kernel.org,
linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
dm-devel@...hat.com, j-nomura@...jp.nec.com
Subject: Re: [PATCH 27/28] blk_end_request: changing scsi mid-layer for bidi
(take 3)
On Thu, Dec 06 2007 at 21:44 +0200, Kiyoshi Ueda <k-ueda@...jp.nec.com> wrote:
> Hi Boaz, Jens,
>
> On Thu, 06 Dec 2007 11:24:44 +0200, Boaz Harrosh <bharrosh@...asas.com> wrote:
>>> Index: 2.6.24-rc3-mm2/drivers/scsi/scsi_lib.c
<snip>
>> No I don't like it. The only client left for blk_end_request_callback()
>> is bidi,
>
> ide-cd (cdrom_newpc_intr) is another client.
> So I can't drop blk_end_request_callback() even if bidi doesn't use it.
>
It looks like all is needed for the ide-cd case is a flag that says
"don't complete the request". And the call-back is not actually used.
(Inspecting the last: [PATCH 26/28] blk_end_request: changing ide-cd (take 3))
The same exact flag could also help the bidi case. Perhaps have an API
for that?
<snip>
>
> Index: 2.6.24-rc3-mm2/drivers/scsi/scsi_lib.c
> ===================================================================
> --- 2.6.24-rc3-mm2.orig/drivers/scsi/scsi_lib.c
> +++ 2.6.24-rc3-mm2/drivers/scsi/scsi_lib.c
> @@ -629,28 +629,6 @@ void scsi_run_host_queues(struct Scsi_Ho
> scsi_run_queue(sdev->request_queue);
> }
>
> -static void scsi_finalize_request(struct scsi_cmnd *cmd, int uptodate)
> -{
> - struct request_queue *q = cmd->device->request_queue;
> - struct request *req = cmd->request;
> - unsigned long flags;
> -
> - add_disk_randomness(req->rq_disk);
> -
> - spin_lock_irqsave(q->queue_lock, flags);
> - if (blk_rq_tagged(req))
> - blk_queue_end_tag(q, req);
> -
> - end_that_request_last(req, uptodate);
> - spin_unlock_irqrestore(q->queue_lock, flags);
> -
> - /*
> - * This will goose the queue request function at the end, so we don't
> - * need to worry about launching another command.
> - */
> - scsi_next_command(cmd);
> -}
> -
> /*
> * Function: scsi_end_request()
> *
> @@ -930,23 +908,25 @@ EXPORT_SYMBOL(scsi_release_buffers);
> void scsi_end_bidi_request(struct scsi_cmnd *cmd)
> {
> struct request *req = cmd->request;
> + unsigned int dlen = req->data_len;
> + unsigned int next_dlen = req->next_rq->data_len;
>
> - end_that_request_chunk(req, 1, req->data_len);
> req->data_len = scsi_out(cmd)->resid;
> -
> - end_that_request_chunk(req->next_rq, 1, req->next_rq->data_len);
> req->next_rq->data_len = scsi_in(cmd)->resid;
>
> - scsi_release_buffers(cmd);
> -
> /*
> *FIXME: If ll_rw_blk.c is changed to also put_request(req->next_rq)
> - * in end_that_request_last() then this WARN_ON must be removed.
> + * in blk_end_bidi_request() then this WARN_ON must be removed.
> * for now, upper-driver must have registered an end_io.
> */
> WARN_ON(!req->end_io);
>
> - scsi_finalize_request(cmd, 1);
> + if (blk_end_bidi_request(req, 1, dlen, next_dlen))
> + /* req has not been completed */
> + BUG();
> +
> + scsi_release_buffers(cmd);
> + scsi_next_command(cmd);
> }
>
> /*
> Index: 2.6.24-rc3-mm2/block/ll_rw_blk.c
> ===================================================================
> --- 2.6.24-rc3-mm2.orig/block/ll_rw_blk.c
> +++ 2.6.24-rc3-mm2/block/ll_rw_blk.c
> @@ -3792,24 +3792,17 @@ static void complete_request(struct requ
> if (!list_empty(&rq->queuelist))
> blkdev_dequeue_request(rq);
>
> + if (blk_bidi_rq(rq) && !rq->end_io)
> + __blk_put_request(rq->next_rq->q, rq->next_rq);
> +
> end_that_request_last(rq, uptodate);
> }
>
> -/**
> - * blk_end_request - Helper function for drivers to complete the request.
> - * @rq: the request being processed
> - * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error
> - * @nr_bytes: number of bytes to complete
> - *
> - * Description:
> - * Ends I/O on a number of bytes attached to @rq.
> - * If @rq has leftover, sets it up for the next range of segments.
> - *
> - * Return:
> - * 0 - we are done with this request
> - * 1 - still buffers pending for this request
> - **/
> -int blk_end_request(struct request *rq, int uptodate, int nr_bytes)
> +/*
> + * Internal function
> + */
> +static int blk_end_io(struct request *rq, int uptodate, int nr_bytes,
> + int bidi_bytes, int (drv_callback)(struct request *))
> {
> struct request_queue *q = rq->q;
> unsigned long flags = 0UL;
> @@ -3817,8 +3810,17 @@ int blk_end_request(struct request *rq,
> if (blk_fs_request(rq) || blk_pc_request(rq)) {
> if (__end_that_request_first(rq, uptodate, nr_bytes))
> return 1;
> +
> + /* Bidi request must be completed as a whole */
> + if (blk_bidi_rq(rq) &&
> + __end_that_request_first(rq->next_rq, uptodate, bidi_bytes))
> + return 1;
> }
>
> + /* Special feature for tricky drivers */
> + if (drv_callback && drv_callback(rq))
> + return 1;
> +
> add_disk_randomness(rq->rq_disk);
>
> spin_lock_irqsave(q->queue_lock, flags);
> @@ -3827,6 +3829,32 @@ int blk_end_request(struct request *rq,
>
> return 0;
> }
> +
> +int blk_end_bidi_request(struct request *rq, int uptodate, int nr_bytes,
> + int bidi_bytes)
> +{
> + return blk_end_io(rq, uptodate, nr_bytes, bidi_bytes, NULL);
> +}
> +EXPORT_SYMBOL_GPL(blk_end_bidi_request);
> +
> +/**
> + * blk_end_request - Helper function for drivers to complete the request.
> + * @rq: the request being processed
> + * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error
> + * @nr_bytes: number of bytes to complete
> + *
> + * Description:
> + * Ends I/O on a number of bytes attached to @rq.
> + * If @rq has leftover, sets it up for the next range of segments.
> + *
> + * Return:
> + * 0 - we are done with this request
> + * 1 - still buffers pending for this request
> + **/
> +int blk_end_request(struct request *rq, int uptodate, int nr_bytes)
> +{
> + return blk_end_io(rq, uptodate, nr_bytes, 0, NULL);
> +}
> EXPORT_SYMBOL_GPL(blk_end_request);
>
All above looks fine, thanks.
> /**
> @@ -3878,25 +3906,7 @@ EXPORT_SYMBOL_GPL(__blk_end_request);
> int blk_end_request_callback(struct request *rq, int uptodate, int nr_bytes,
> int (drv_callback)(struct request *))
> {
> - struct request_queue *q = rq->q;
> - unsigned long flags = 0UL;
> -
> - if (blk_fs_request(rq) || blk_pc_request(rq)) {
> - if (__end_that_request_first(rq, uptodate, nr_bytes))
> - return 1;
> - }
> -
> - /* Special feature for tricky drivers */
> - if (drv_callback && drv_callback(rq))
> - return 1;
> -
> - add_disk_randomness(rq->rq_disk);
> -
> - spin_lock_irqsave(q->queue_lock, flags);
> - complete_request(rq, uptodate);
> - spin_unlock_irqrestore(q->queue_lock, flags);
> -
> - return 0;
> + return blk_end_io(rq, uptodate, nr_bytes, 0, drv_callback);
> }
> EXPORT_SYMBOL_GPL(blk_end_request_callback);
>
Boaz
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