noop refactor: fcs eviction with/without lru

src/fellow_cache.c

@@ -2504,18 +2504,27 @@ fellow_cache_async_thread(void *priv)
 // XXX better way
 #ifndef TEST_DRIVER
 static inline void
-fellow_cache_seg_evict_locked(struct fellow_cache *fc,
+fellow_cache_seg_evict_locked(
     struct fellow_cache_seg *fcs, struct buddy_ptr_extent *alloc)
 {
 	AZ(fcs->refcnt);
-	AN(fcs->fcs_onlru);
+	AZ(fcs->fcs_onlru);
 	assert(fcs->state == FCS_INCORE);
 	*alloc = fcs->alloc;
 	fcs->alloc = buddy_ptr_extent_nil;
 	fcs->len = 0;
 	fcs->state = FCS_DISK;
+}
+
+static inline void
+fellow_cache_lru_seg_evict_locked(
+    struct fellow_cache_seg *fcs, struct buddy_ptr_extent *alloc,
+    struct fellow_cache *fc)
+{
+	AN(fcs->fcs_onlru);
 	fcs->fcs_onlru = 0;
 	VTAILQ_REMOVE(&fc->lru_head, fcs, lru_list);
+	fellow_cache_seg_evict_locked(fcs, alloc);
 }
 
 static int
@@ -2546,8 +2555,8 @@ fellow_cache_lru_work(struct worker *wrk, struct fellow_cache *fc)
 			continue;
 		}
 		if (fcs->state == FCS_INCORE) {
-			fellow_cache_seg_evict_locked(fc, fcs,
-			    &alloc);
+			fellow_cache_lru_seg_evict_locked(fcs,
+			    &alloc, fc);
 			AZ(pthread_mutex_unlock(&fco->mtx));
 			fco = NULL;
 			break;
@@ -2648,7 +2657,7 @@ fellow_cache_lru_thread(struct worker *wrk, void *priv)
 	buddy = fc->membuddy;
 	CHECK_OBJ(buddy, BUDDY_MAGIC);
 
-	// fellow_cache_seg_evict_locked()
+	// fellow_cache_lru_seg_evict_locked()
 	assert_fcos_transition(FCS_INCORE, FCS_DISK);
 
 	reqs = BUDDY_REQS_STK(buddy, BUDDY_REQS_MAX);

src/fellow_storage.c

@@ -381,6 +381,13 @@ sfemem_objslim(struct worker *wrk, struct objcore *memoc)
 		mutate_to_sfeexp(memoc, xid);
 		return;
 	}
+
+	/*
+	 * for calls from HSH_Cancel, we could write a new disk object with no
+	 * body. For now, just free any body segments cached in memory
+	 */
+
+	
 }
 
 static void v_matchproto_(objfree_f)