Commit 11d8a6e3 authored by NeilBrown's avatar NeilBrown
Browse files

md/raid5: export is_congested test 



the dm module will need this for dm-raid45.

Also only access ->queue->backing_dev_info->congested_fn
if ->queue actually exists.  It won't in a dm target.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 4a5add49

drivers/md/raid5.c

+15 −7
Original line number Diff line number Diff line
@@ -3678,17 +3678,14 @@ static void raid5_unplug_device(struct request_queue *q) 
	unplug_slaves(mddev);

}



static int raid5_congested(void *data, int bits)

int md_raid5_congested(mddev_t *mddev, int bits)

{

	mddev_t *mddev = data;

	raid5_conf_t *conf = mddev->private;



	/* No difference between reads and writes.  Just check

	 * how busy the stripe_cache is

	 */



	if (mddev_congested(mddev, bits))

		return 1;

	if (conf->inactive_blocked)

		return 1;

	if (conf->quiesce)
@@ -3698,6 +3695,15 @@ static int raid5_congested(void *data, int bits) 


	return 0;

}

EXPORT_SYMBOL_GPL(md_raid5_congested);



static int raid5_congested(void *data, int bits)

{

	mddev_t *mddev = data;



	return mddev_congested(mddev, bits) ||

		md_raid5_congested(mddev, bits);

}



/* We want read requests to align with chunks where possible,

 * but write requests don't need to.
@@ -5184,13 +5190,14 @@ static int run(mddev_t *mddev) 
			mddev->queue->backing_dev_info.ra_pages = 2 * stripe;



		blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec);



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

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

	}



	mddev->queue->queue_lock = &conf->device_lock;



	mddev->queue->unplug_fn = raid5_unplug_device;

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

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



	chunk_size = mddev->chunk_sectors << 9;

	blk_queue_io_min(mddev->queue, chunk_size);
@@ -5220,6 +5227,7 @@ static int stop(mddev_t *mddev) 


	md_unregister_thread(mddev->thread);

	mddev->thread = NULL;

	if (mddev->queue)

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

	blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/

	free_conf(conf);

drivers/md/raid5.h

+2 −0
Original line number Diff line number Diff line
@@ -497,5 +497,7 @@ static inline int algorithm_is_DDF(int layout) 
{

	return layout >= 8 && layout <= 10;

}



extern int md_raid5_congested(mddev_t *mddev, int bits);

extern int raid5_set_cache_size(mddev_t *mddev, int size);

#endif