bch_uuid_write
int bch_uuid_write(struct cache_set *c);
bch_uuid_write(c);
bch_uuid_write(c);
bch_uuid_write(c);
bch_uuid_write(d->c);
bch_uuid_write(dc->disk.c);
bch_uuid_write(d->c);
bch_uuid_write(d->c);