Re: [dm-devel] [PATCH 4/5] block: remove the request_queue argument to the block_bio_remap tracepoint

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On 2020/12/01 3:09, Christoph Hellwig wrote:
> The request_queue can trivially be derived from the bio.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  block/blk-core.c              |  2 +-
>  drivers/md/dm.c               |  3 +--
>  drivers/md/md-linear.c        |  3 +--
>  drivers/md/md.c               |  5 ++---
>  drivers/md/raid0.c            |  4 ++--
>  drivers/md/raid1.c            |  7 +++----
>  drivers/md/raid10.c           |  6 ++----
>  drivers/md/raid5.c            | 15 +++++++--------
>  drivers/nvme/host/multipath.c |  3 +--
>  include/trace/events/block.h  |  8 +++-----
>  kernel/trace/blktrace.c       | 14 +++++---------
>  11 files changed, 28 insertions(+), 42 deletions(-)
> 
> diff --git a/block/blk-core.c b/block/blk-core.c
> index cb24654983e1e4..96e5fcd7f071b6 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -758,7 +758,7 @@ static inline int blk_partition_remap(struct bio *bio)
>  		if (bio_check_eod(bio, bdev_nr_sectors(p)))
>  			goto out;
>  		bio->bi_iter.bi_sector += p->bd_start_sect;
> -		trace_block_bio_remap(bio->bi_disk->queue, bio, p->bd_dev,
> +		trace_block_bio_remap(bio, p->bd_dev,
>  				      bio->bi_iter.bi_sector -
>  				      p->bd_start_sect);
>  	}
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index 9a5bd90779c7c4..5181907dc59537 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -1276,8 +1276,7 @@ static blk_qc_t __map_bio(struct dm_target_io *tio)
>  		break;
>  	case DM_MAPIO_REMAPPED:
>  		/* the bio has been remapped so dispatch it */
> -		trace_block_bio_remap(clone->bi_disk->queue, clone,
> -				      bio_dev(io->orig_bio), sector);
> +		trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector);
>  		ret = submit_bio_noacct(clone);
>  		break;
>  	case DM_MAPIO_KILL:
> diff --git a/drivers/md/md-linear.c b/drivers/md/md-linear.c
> index 98f1b4b2bdcef8..68cac7d1927823 100644
> --- a/drivers/md/md-linear.c
> +++ b/drivers/md/md-linear.c
> @@ -257,8 +257,7 @@ static bool linear_make_request(struct mddev *mddev, struct bio *bio)
>  		bio_endio(bio);
>  	} else {
>  		if (mddev->gendisk)
> -			trace_block_bio_remap(bio->bi_disk->queue,
> -					      bio, disk_devt(mddev->gendisk),
> +			trace_block_bio_remap(bio, disk_devt(mddev->gendisk),
>  					      bio_sector);
>  		mddev_check_writesame(mddev, bio);
>  		mddev_check_write_zeroes(mddev, bio);
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 0065736f05b428..c555be0a8dce78 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -8591,9 +8591,8 @@ void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
>  	bio_chain(discard_bio, bio);
>  	bio_clone_blkg_association(discard_bio, bio);
>  	if (mddev->gendisk)
> -		trace_block_bio_remap(bdev_get_queue(rdev->bdev),
> -			discard_bio, disk_devt(mddev->gendisk),
> -			bio->bi_iter.bi_sector);
> +		trace_block_bio_remap(discard_bio, disk_devt(mddev->gendisk),
> +				      bio->bi_iter.bi_sector);
>  	submit_bio_noacct(discard_bio);
>  }
>  EXPORT_SYMBOL(md_submit_discard_bio);
> diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
> index 6f44177593a552..e5d7411cba9b46 100644
> --- a/drivers/md/raid0.c
> +++ b/drivers/md/raid0.c
> @@ -571,8 +571,8 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio)
>  		tmp_dev->data_offset;
>  
>  	if (mddev->gendisk)
> -		trace_block_bio_remap(bio->bi_disk->queue, bio,
> -				disk_devt(mddev->gendisk), bio_sector);
> +		trace_block_bio_remap(bio, disk_devt(mddev->gendisk),
> +				      bio_sector);
>  	mddev_check_writesame(mddev, bio);
>  	mddev_check_write_zeroes(mddev, bio);
>  	submit_bio_noacct(bio);
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index 960d854c07f897..c0347997f6ff73 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -1305,8 +1305,8 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio,
>  	read_bio->bi_private = r1_bio;
>  
>  	if (mddev->gendisk)
> -	        trace_block_bio_remap(read_bio->bi_disk->queue, read_bio,
> -				disk_devt(mddev->gendisk), r1_bio->sector);
> +	        trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk),
> +				      r1_bio->sector);
>  
>  	submit_bio_noacct(read_bio);
>  }
> @@ -1517,8 +1517,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
>  		atomic_inc(&r1_bio->remaining);
>  
>  		if (mddev->gendisk)
> -			trace_block_bio_remap(mbio->bi_disk->queue,
> -					      mbio, disk_devt(mddev->gendisk),
> +			trace_block_bio_remap(mbio, disk_devt(mddev->gendisk),
>  					      r1_bio->sector);
>  		/* flush_pending_writes() needs access to the rdev so...*/
>  		mbio->bi_disk = (void *)conf->mirrors[i].rdev;
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index b7bca6703df814..a6f99fa0b32cfc 100644
> --- a/drivers/md/raid10.c
> +++ b/drivers/md/raid10.c
> @@ -1200,8 +1200,7 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
>  	read_bio->bi_private = r10_bio;
>  
>  	if (mddev->gendisk)
> -	        trace_block_bio_remap(read_bio->bi_disk->queue,
> -	                              read_bio, disk_devt(mddev->gendisk),
> +	        trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk),
>  	                              r10_bio->sector);
>  	submit_bio_noacct(read_bio);
>  	return;
> @@ -1250,8 +1249,7 @@ static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio,
>  	mbio->bi_private = r10_bio;
>  
>  	if (conf->mddev->gendisk)
> -		trace_block_bio_remap(mbio->bi_disk->queue,
> -				      mbio, disk_devt(conf->mddev->gendisk),
> +		trace_block_bio_remap(mbio, disk_devt(conf->mddev->gendisk),
>  				      r10_bio->sector);
>  	/* flush_pending_writes() needs access to the rdev so...*/
>  	mbio->bi_disk = (void *)rdev;
> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
> index 39343479ac2a94..3a90cc0e43ca8e 100644
> --- a/drivers/md/raid5.c
> +++ b/drivers/md/raid5.c
> @@ -1222,9 +1222,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
>  				set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags);
>  
>  			if (conf->mddev->gendisk)
> -				trace_block_bio_remap(bi->bi_disk->queue,
> -						      bi, disk_devt(conf->mddev->gendisk),
> -						      sh->dev[i].sector);
> +				trace_block_bio_remap(bi,
> +						disk_devt(conf->mddev->gendisk),
> +						sh->dev[i].sector);
>  			if (should_defer && op_is_write(op))
>  				bio_list_add(&pending_bios, bi);
>  			else
> @@ -1272,9 +1272,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
>  			if (op == REQ_OP_DISCARD)
>  				rbi->bi_vcnt = 0;
>  			if (conf->mddev->gendisk)
> -				trace_block_bio_remap(rbi->bi_disk->queue,
> -						      rbi, disk_devt(conf->mddev->gendisk),
> -						      sh->dev[i].sector);
> +				trace_block_bio_remap(rbi,
> +						disk_devt(conf->mddev->gendisk),
> +						sh->dev[i].sector);
>  			if (should_defer && op_is_write(op))
>  				bio_list_add(&pending_bios, rbi);
>  			else
> @@ -5468,8 +5468,7 @@ static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio)
>  		spin_unlock_irq(&conf->device_lock);
>  
>  		if (mddev->gendisk)
> -			trace_block_bio_remap(align_bi->bi_disk->queue,
> -					      align_bi, disk_devt(mddev->gendisk),
> +			trace_block_bio_remap(align_bi, disk_devt(mddev->gendisk),
>  					      raid_bio->bi_iter.bi_sector);
>  		submit_bio_noacct(align_bi);
>  		return 1;
> diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
> index 74896be40c1769..106cf5c44ee7ab 100644
> --- a/drivers/nvme/host/multipath.c
> +++ b/drivers/nvme/host/multipath.c
> @@ -312,8 +312,7 @@ blk_qc_t nvme_ns_head_submit_bio(struct bio *bio)
>  	if (likely(ns)) {
>  		bio->bi_disk = ns->disk;
>  		bio->bi_opf |= REQ_NVME_MPATH;
> -		trace_block_bio_remap(bio->bi_disk->queue, bio,
> -				      disk_devt(ns->head->disk),
> +		trace_block_bio_remap(bio, disk_devt(ns->head->disk),
>  				      bio->bi_iter.bi_sector);
>  		ret = submit_bio_noacct(bio);
>  	} else if (nvme_available_path(head)) {
> diff --git a/include/trace/events/block.h b/include/trace/events/block.h
> index b415e4cba84304..8fb89574d8677f 100644
> --- a/include/trace/events/block.h
> +++ b/include/trace/events/block.h
> @@ -450,9 +450,8 @@ TRACE_EVENT(block_split,
>  
>  /**
>   * block_bio_remap - map request for a logical device to the raw device
> - * @q: queue holding the operation
>   * @bio: revised operation
> - * @dev: device for the operation
> + * @dev: original device for the operation
>   * @from: original sector for the operation
>   *
>   * An operation for a logical device has been mapped to the
> @@ -460,10 +459,9 @@ TRACE_EVENT(block_split,
>   */
>  TRACE_EVENT(block_bio_remap,
>  
> -	TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev,
> -		 sector_t from),
> +	TP_PROTO(struct bio *bio, dev_t dev, sector_t from),
>  
> -	TP_ARGS(q, bio, dev, from),
> +	TP_ARGS(bio, dev, from),
>  
>  	TP_STRUCT__entry(
>  		__field( dev_t,		dev		)
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index 3ca6d62114f461..405637144a0389 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -993,20 +993,16 @@ static void blk_add_trace_split(void *ignore, struct bio *bio, unsigned int pdu)
>  /**
>   * blk_add_trace_bio_remap - Add a trace for a bio-remap operation
>   * @ignore:	trace callback data parameter (not used)
> - * @q:		queue the io is for
>   * @bio:	the source bio
> - * @dev:	target device
> + * @dev:	source device
>   * @from:	source sector
>   *
> - * Description:
> - *     Device mapper or raid target sometimes need to split a bio because
> - *     it spans a stripe (or similar). Add a trace for that action.
> - *
> + * Called after a bio is remapped to a different device and/or sector.
>   **/
> -static void blk_add_trace_bio_remap(void *ignore,
> -				    struct request_queue *q, struct bio *bio,
> -				    dev_t dev, sector_t from)
> +static void blk_add_trace_bio_remap(void *ignore, struct bio *bio, dev_t dev,
> +				    sector_t from)
>  {
> +	struct request_queue *q = bio->bi_disk->queue;
>  	struct blk_trace *bt;
>  	struct blk_io_trace_remap r;
>  
> 

Looks good.

Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxx>

-- 
Damien Le Moal
Western Digital Research




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