lockref_get_not_zero  913 fs/dcache.c    	gotref = lockref_get_not_zero(&ret->d_lockref);
lockref_get_not_zero   39 include/linux/lockref.h extern int lockref_get_not_zero(struct lockref *);
lockref_get_not_zero   84 lib/lockref.c  EXPORT_SYMBOL(lockref_get_not_zero);