newblk_lookup
if (newblk_lookup(fs, newblkno, DEPALLOC, &newblk) != 0)
if (newblk_lookup(ip->i_fs, newblkno, 0, &newblk) == 0)
if (newblk_lookup(ip->i_fs, aip->ai_newblkno, 0,
static int newblk_lookup(struct fs *, ufs_daddr_t, int,