diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index d1f4be014fa40e58d8232a2036d88bb8d5d12959..2ae526e4caeb00393d6de60e904f90d8919eac43 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4321,6 +4321,8 @@ int try_release_extent_mapping(struct page *page, gfp_t mask)
 
 			/* once for us */
 			free_extent_map(em);
+
+			cond_resched(); /* Allow large-extent preemption. */
 		}
 	}
 	return try_release_extent_state(tree, page, mask);