di_blksize
n->di_blksize = bswap32(o->di_blksize);
n->di_blksize = bswap32(o->di_blksize);
uint32_t di_blksize; /* 12: Inode blocksize. */
dst->di_blksize = src->di_blksize;
uint32_t di_blksize; /* 12: Inode blocksize. */
#define i_ffs2_blksize i_din.ffs2_din->di_blksize