fellow_logcache: alloc on demand from mempool

src/fellow_log.c

@@ -1157,7 +1157,7 @@ fellow_logcache_fini(struct fellow_logcache *flc)
 	VTAILQ_FOREACH(fle, &flc->free, list) {
 		CHECK_OBJ(fle, FELLOW_LOGCACHE_ENTRY_MAGIC);
 		AZ(fle->incore);
-		AN(buddy_return_ptr_page(rets, &fle->alloc));
+		AZ(fle->alloc.ptr);
 	}
 	VTAILQ_FOREACH(fle, &flc->used, list) {
 		CHECK_OBJ(fle, FELLOW_LOGCACHE_ENTRY_MAGIC);
@@ -1231,8 +1231,6 @@ fellow_logcache_init(struct fellow_logcache *flc, struct fellow_fd *ffd,
 	     u < flc->n;
 	     u++, fle++) {
 		INIT_OBJ(fle, FELLOW_LOGCACHE_ENTRY_MAGIC);
-		fle->alloc = buddy_get_next_ptr_page(
-		    flc_mempool_get(flc->mempool, NULL));
 		VTAILQ_INSERT_TAIL(&flc->free, fle, list);
 	}
 
@@ -1265,6 +1263,7 @@ fellow_logcache_return(struct fellow_logcache *flc,
 	fle->incore = 0;
 	fle->off = 0;
 	fle->error = NULL;
+	buddy_return1_ptr_page(flc->ffd->membuddy, &fle->alloc);
 
 	VTAILQ_REMOVE(&flc->used, fle, list);
 	VTAILQ_INSERT_HEAD(&flc->free, fle, list);
@@ -1322,6 +1321,11 @@ fellow_logcache_take(struct fellow_logcache *flc, int direction)
 		return (fellow_logcache_steal(flc, direction));
 
 	VTAILQ_REMOVE(&flc->free, fle, list);
+	AZ(fle->alloc.ptr);
+
+	fle->alloc = buddy_get_next_ptr_page(
+	    flc_mempool_get(flc->mempool, NULL));
+
 	return (fle);
 }