dm table: require that request-based DM be layered on blk-mq devices (cef6f55a) · Commits · 戴 / test

drivers/md/dm-table.c

+17 −1

Original line number	Diff line number	Diff line
		@@ -908,10 +908,21 @@ static bool dm_table_supports_dax(struct dm_table *t)

		static bool dm_table_does_not_support_partial_completion(struct dm_table *t);

		struct verify_rq_based_data {
		unsigned sq_count;
		unsigned mq_count;
		};

		static int device_is_rq_based(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);
		struct verify_rq_based_data *v = data;

		if (q->mq_ops)
		v->mq_count++;
		else
		v->sq_count++;

		return queue_is_rq_based(q);
		}
		@@ -920,6 +931,7 @@ static int dm_table_determine_type(struct dm_table *t)
		{
		unsigned i;
		unsigned bio_based = 0, request_based = 0, hybrid = 0;
		struct verify_rq_based_data v = {.sq_count = 0, .mq_count = 0};
		struct dm_target *tgt;
		struct list_head *devices = dm_table_get_devices(t);
		enum dm_queue_mode live_md_type = dm_get_md_type(t->md);
		@@ -1022,10 +1034,14 @@ verify_rq_based:

		/* Non-request-stackable devices can't be used for request-based dm */
		if (!tgt->type->iterate_devices \|\|
		!tgt->type->iterate_devices(tgt, device_is_rq_based, NULL)) {
		!tgt->type->iterate_devices(tgt, device_is_rq_based, &v)) {
		DMERR("table load rejected: including non-request-stackable devices");
		return -EINVAL;
		}
		if (v.sq_count > 0) {
		DMERR("table load rejected: not all devices are blk-mq request-stackable");
		return -EINVAL;
		}

		return 0;
		}