dm table: allow targets without devices to set ->io_hints

In dm_calculate_queue_limits, add call to ->io_hints hook if the target doesn't provide ->iterate_devices. This is needed so the "error" and "zero" targets may support discards. The 2 following commits will add their respective discard support. Signed-off-by: Mikulas Patocka <[email protected]> Tested-by: Milan Broz <[email protected]> Signed-off-by: Mike Snitzer <[email protected]>
chewitt · Apr 4, 2023 · 85c938e · 85c938e
1 parent 074c446
commit 85c938e
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
@@ -1670,8 +1670,12 @@ int dm_calculate_queue_limits(struct dm_table *t,
 
 		blk_set_stacking_limits(&ti_limits);
 
-		if (!ti->type->iterate_devices)
+		if (!ti->type->iterate_devices) {
+			/* Set I/O hints portion of queue limits */
+			if (ti->type->io_hints)
+				ti->type->io_hints(ti, &ti_limits);
 			goto combine_limits;
+		}
 
 		/*
 		 * Combine queue limits of all the devices this target uses.