DIRECT              4 fs/minix/itree_v1.c enum {DEPTH = 3, DIRECT = 7};	/* Only double indirect */
DIRECT              4 fs/minix/itree_v2.c enum {DIRECT = 7, DEPTH = 4};	/* Have triple indirect */
DIRECT             13 fs/sysv/itree.c enum {DIRECT = 10, DEPTH = 4};	/* Have triple indirect */