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Date: Thu, 21 Dec 2006 14:53:47 -0800 (PST)
From: business1 <coreyu@...teamsite.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/8] rqbased-dm: add block layer hook
Kiyoshi Ueda wrote:
>
> This patch adds new "end_io_first" hook in __end_that_request_first()
> for request-based device-mapper.
>
>
> Signed-off-by: Kiyoshi Ueda <k-ueda@...jp.nec.com>
> Signed-off-by: Jun'ichi Nomura <j-nomura@...jp.nec.com>
>
> diff -rupN 1-blk-get-request-irqrestore/block/ll_rw_blk.c
> 2-add-generic-hook/block/ll_rw_blk.c
> --- 1-blk-get-request-irqrestore/block/ll_rw_blk.c 2006-12-15
> 10:21:29.000000000 -0500
> +++ 2-add-generic-hook/block/ll_rw_blk.c 2006-12-15 10:23:30.000000000
> -0500
> @@ -260,6 +260,7 @@ static void rq_init(request_queue_t *q,
> rq->data = NULL;
> rq->nr_phys_segments = 0;
> rq->sense = NULL;
> + rq->end_io_first = NULL;
> rq->end_io = NULL;
> rq->end_io_data = NULL;
> rq->completion_data = NULL;
> @@ -3216,6 +3217,22 @@ static int __end_that_request_first(stru
>
> blk_add_trace_rq(req->q, req, BLK_TA_COMPLETE);
>
> + if (!uptodate) {
> + if (blk_fs_request(req) && !(req->cmd_flags & REQ_QUIET))
> + printk("end_request: I/O error, dev %s, sector %llu\n",
> + req->rq_disk ? req->rq_disk->disk_name : "?",
> + (unsigned long long)req->sector);
> + }
> +
> + if (blk_fs_request(req) && req->rq_disk) {
> + const int rw = rq_data_dir(req);
> +
> + disk_stat_add(req->rq_disk, sectors[rw], nr_bytes >> 9);
> + }
> +
> + if (req->end_io_first)
> + return req->end_io_first(req, uptodate, nr_bytes);
> +
> /*
> * extend uptodate bool to allow < 0 value to be direct io error
> */
> @@ -3230,19 +3247,6 @@ static int __end_that_request_first(stru
> if (!blk_pc_request(req))
> req->errors = 0;
>
> - if (!uptodate) {
> - if (blk_fs_request(req) && !(req->cmd_flags & REQ_QUIET))
> - printk("end_request: I/O error, dev %s, sector %llu\n",
> - req->rq_disk ? req->rq_disk->disk_name : "?",
> - (unsigned long long)req->sector);
> - }
> -
> - if (blk_fs_request(req) && req->rq_disk) {
> - const int rw = rq_data_dir(req);
> -
> - disk_stat_add(req->rq_disk, sectors[rw], nr_bytes >> 9);
> - }
> -
> total_bytes = bio_nbytes = 0;
> while ((bio = req->bio) != NULL) {
> int nbytes;
> diff -rupN 1-blk-get-request-irqrestore/include/linux/blkdev.h
> 2-add-generic-hook/include/linux/blkdev.h
> --- 1-blk-get-request-irqrestore/include/linux/blkdev.h 2006-12-11
> 14:32:53.000000000 -0500
> +++ 2-add-generic-hook/include/linux/blkdev.h 2006-12-15
> 10:23:30.000000000 -0500
> @@ -126,6 +126,7 @@ void copy_io_context(struct io_context *
> void swap_io_context(struct io_context **ioc1, struct io_context **ioc2);
>
> struct request;
> +typedef int (rq_end_first_fn)(struct request *, int, int);
> typedef void (rq_end_io_fn)(struct request *, int);
>
> struct request_list {
> @@ -312,6 +313,7 @@ struct request {
> /*
> * completion callback.
> */
> + rq_end_first_fn *end_io_first;
> rq_end_io_fn *end_io;
> void *end_io_data;
> };
>
> -
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>
--
View this message in context: http://www.nabble.com/-RFC-PATCH-2-8--rqbased-dm%3A-add-block-layer-hook-tf2848786.html#a8016520
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