fsinfo
struct fat_od_fsi fsinfo;
fatp = build_fat(wbpb, &fsinfo, &fatsize,
write_bootsects(fd, &bootsect, wbpb, &fsinfo, seekto);
{ "fsinfo", "?[-v]", "print mounted filesystems", fsinfo },
int fsinfo(uintptr_t, uint_t, int, const mdb_arg_t *);