Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f022b2fd authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
Browse files

[PATCH] md: add a ->congested_fn function for raid5/6 



This is very different from other raid levels and all requests go through a
'stripe cache', and it has congestion management already.

Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 0d129228

drivers/md/raid5.c

+21 −0
Original line number Diff line number Diff line
@@ -2593,6 +2593,24 @@ static int raid5_issue_flush(request_queue_t *q, struct gendisk *disk, 
	return ret;

}



static int raid5_congested(void *data, int bits)

{

	mddev_t *mddev = data;

	raid5_conf_t *conf = mddev_to_conf(mddev);



	/* No difference between reads and writes.  Just check

	 * how busy the stripe_cache is

	 */

	if (conf->inactive_blocked)

		return 1;

	if (conf->quiesce)

		return 1;

	if (list_empty_careful(&conf->inactive_list))

		return 1;



	return 0;

}



static int make_request(request_queue_t *q, struct bio * bi)

{

	mddev_t *mddev = q->queuedata;
@@ -3296,6 +3314,9 @@ static int run(mddev_t *mddev) 


	mddev->queue->unplug_fn = raid5_unplug_device;

	mddev->queue->issue_flush_fn = raid5_issue_flush;

	mddev->queue->backing_dev_info.congested_fn = raid5_congested;

	mddev->queue->backing_dev_info.congested_data = mddev;



	mddev->array_size =  mddev->size * (conf->previous_raid_disks -

					    conf->max_degraded);