Ceph

There's a part of the ReplicatedPG::sub_op_modify code that goes like this:

>       // do op
 >       ObjectState obs(op->poid, op->oloc);
 >       obs.oi.version = op->old_version;
 >       obs.oi.size = op->old_size;
 >       obs.exists = op->old_exists;
 > 
 >       rm->ctx = new OpContext(op, op->reqid, op->ops, &obs, this);
 > 
 >       rm->ctx->mtime = op->mtime;
 >       rm->ctx->at_version = op->version;
 >       rm->ctx->snapc = op->snapc;
 > 
 >       SnapSetContext ssc(op->poid.oid);
 >       ssc.snapset = op->snapset;
 >       rm->ctx->obs->ssc = &ssc;
 > 
 >       prepare_transaction(rm->ctx);
 >       log_op(rm->ctx->log, op->pg_trim_to, rm->ctx->local_t);
 > 
 >       rm->tls.push_back(&rm->ctx->op_t);
 >       rm->tls.push_back(&rm->ctx->local_t);
 >     }

Well, first of all, ObjectState is a local variable that goes out of scope at the end of this block, so we should never keep its address around afterwards. Secondly, we need to somehow figure out how to set ObjectState's object_info_t so that it knows if the object is lost, rather than just always assuming that it's not.