lblktosize
lblktosize(imp, rablock) < ip->i_size) {
(uint64_t)lblktosize(fs, lbn + 1)) {
if (ip->i_ffs1_size < (uint64_t)lblktosize(fs, lbn + 1))
(uint64_t)lblktosize(fs, lbn + 1)) {
if (ip->i_ffs2_size < (uint64_t)lblktosize(fs, lbn + 1))