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

Commit a4afe76b authored by Keith Busch's avatar Keith Busch Committed by Mike Snitzer
Browse files

dm: inherit QUEUE_FLAG_SG_GAPS flags from underlying queues 



A DM device must inherit the QUEUE_FLAG_SG_GAPS flags from its
underlying block devices' request queues.

This fixes problems when submitting cloned requests to multipathed
devices requiring virtually contiguous buffers.

Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 0c8f8632

drivers/md/dm-table.c

+13 −0
Original line number Diff line number Diff line
@@ -1389,6 +1389,14 @@ static int queue_supports_sg_merge(struct dm_target *ti, struct dm_dev *dev, 
	return q && !test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags);

}



static int queue_supports_sg_gaps(struct dm_target *ti, struct dm_dev *dev,

				  sector_t start, sector_t len, void *data)

{

	struct request_queue *q = bdev_get_queue(dev->bdev);



	return q && !test_bit(QUEUE_FLAG_SG_GAPS, &q->queue_flags);

}



static bool dm_table_all_devices_attribute(struct dm_table *t,

					   iterate_devices_callout_fn func)

{
@@ -1509,6 +1517,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, 
	else

		queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q);



	if (dm_table_all_devices_attribute(t, queue_supports_sg_gaps))

		queue_flag_clear_unlocked(QUEUE_FLAG_SG_GAPS, q);

	else

		queue_flag_set_unlocked(QUEUE_FLAG_SG_GAPS, q);



	dm_table_set_integrity(t);



	/*