1427 static void umount_tree(struct mount *mnt, enum umount_tree_flags how)  in umount_tree()  function
1585 			umount_tree(mnt, UMOUNT_PROPAGATE);  in do_umount()
1592 				umount_tree(mnt, UMOUNT_PROPAGATE|UMOUNT_SYNC);  in do_umount()
1630 		else umount_tree(mnt, UMOUNT_CONNECTED);  in __detach_mounts()
1808 		umount_tree(res, UMOUNT_SYNC);  in copy_tree()
1842 			umount_tree(real_mount(mnt), UMOUNT_CONNECTED);  in dissolve_on_fput()
1856 	umount_tree(real_mount(mnt), 0);  in drop_collected_mounts()
2115 		umount_tree(child, UMOUNT_SYNC);  in attach_recursive_mnt()
2310 		umount_tree(mnt, UMOUNT_SYNC);  in do_loopback()
2906 		umount_tree(mnt, UMOUNT_PROPAGATE|UMOUNT_SYNC);  in mark_mounts_for_expiry()
2977 			umount_tree(m, UMOUNT_PROPAGATE|UMOUNT_SYNC);  in shrink_submounts()