Commit 16ef5101 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

md: update the optimal I/O size on reshape 



The raid5 and raid10 drivers currently update the read-ahead size,
but not the optimal I/O size on reshape.  To prepare for deriving the
read-ahead size from the optimal I/O size make sure it is updated
as well.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Acked-by: default avatarSong Liu <song@kernel.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 55b2598e

drivers/md/raid10.c

+14 −8
Original line number Diff line number Diff line
@@ -3703,10 +3703,20 @@ static struct r10conf *setup_conf(struct mddev *mddev) 
	return ERR_PTR(err);

}



static void raid10_set_io_opt(struct r10conf *conf)

{

	int raid_disks = conf->geo.raid_disks;



	if (!(conf->geo.raid_disks % conf->geo.near_copies))

		raid_disks /= conf->geo.near_copies;

	blk_queue_io_opt(conf->mddev->queue, (conf->mddev->chunk_sectors << 9) *

			 raid_disks);

}



static int raid10_run(struct mddev *mddev)

{

	struct r10conf *conf;

	int i, disk_idx, chunk_size;

	int i, disk_idx;

	struct raid10_info *disk;

	struct md_rdev *rdev;

	sector_t size;
@@ -3742,18 +3752,13 @@ static int raid10_run(struct mddev *mddev) 
	mddev->thread = conf->thread;

	conf->thread = NULL;



	chunk_size = mddev->chunk_sectors << 9;

	if (mddev->queue) {

		blk_queue_max_discard_sectors(mddev->queue,

					      mddev->chunk_sectors);

		blk_queue_max_write_same_sectors(mddev->queue, 0);

		blk_queue_max_write_zeroes_sectors(mddev->queue, 0);

		blk_queue_io_min(mddev->queue, chunk_size);

		if (conf->geo.raid_disks % conf->geo.near_copies)

			blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks);

		else

			blk_queue_io_opt(mddev->queue, chunk_size *

					 (conf->geo.raid_disks / conf->geo.near_copies));

		blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);

		raid10_set_io_opt(conf);

	}



	rdev_for_each(rdev, mddev) {
@@ -4727,6 +4732,7 @@ static void end_reshape(struct r10conf *conf) 
		stripe /= conf->geo.near_copies;

		if (conf->mddev->queue->backing_dev_info->ra_pages < 2 * stripe)

			conf->mddev->queue->backing_dev_info->ra_pages = 2 * stripe;

		raid10_set_io_opt(conf);

	}

	conf->fullsync = 0;

}

drivers/md/raid5.c

+8 −2
Original line number Diff line number Diff line
@@ -7232,6 +7232,12 @@ static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded 
	return 0;

}



static void raid5_set_io_opt(struct r5conf *conf)

{

	blk_queue_io_opt(conf->mddev->queue, (conf->chunk_sectors << 9) *

			 (conf->raid_disks - conf->max_degraded));

}



static int raid5_run(struct mddev *mddev)

{

	struct r5conf *conf;
@@ -7521,8 +7527,7 @@ static int raid5_run(struct mddev *mddev) 


		chunk_size = mddev->chunk_sectors << 9;

		blk_queue_io_min(mddev->queue, chunk_size);

		blk_queue_io_opt(mddev->queue, chunk_size *

				 (conf->raid_disks - conf->max_degraded));

		raid5_set_io_opt(conf);

		mddev->queue->limits.raid_partial_stripes_expensive = 1;

		/*

		 * We can only discard a whole stripe. It doesn't make sense to
@@ -8115,6 +8120,7 @@ static void end_reshape(struct r5conf *conf) 
						   / PAGE_SIZE);

			if (conf->mddev->queue->backing_dev_info->ra_pages < 2 * stripe)

				conf->mddev->queue->backing_dev_info->ra_pages = 2 * stripe;

			raid5_set_io_opt(conf);

		}

	}

}

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