crush_work_bucket
struct crush_work_bucket **work; /* Per-bucket working store */
struct crush_work_bucket *work, int x, int r)
struct crush_work_bucket *work,
struct crush_work_bucket *work,
v += map->max_buckets * sizeof(struct crush_work_bucket *);
v += sizeof(struct crush_work_bucket);
c->max_buckets * sizeof(struct crush_work_bucket *);
c->working_size += sizeof(struct crush_work_bucket);