clear_em_logging  100 fs/btrfs/extent_map.h void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
clear_em_logging 4445 fs/btrfs/tree-log.c 			clear_em_logging(tree, em);
clear_em_logging 4454 fs/btrfs/tree-log.c 		clear_em_logging(tree, em);