Sync metadata & data after copying from journal

blockstore_flush.h

@@ -12,10 +12,16 @@ struct meta_sector_t
     int usage_count;
 };
 
+struct flusher_sync_t
+{
+    int ready_count;
+    int state;
+};
+
 class journal_flusher_t;
 
 // Journal flusher coroutine
-struct journal_flusher_co
+class journal_flusher_co
 {
     blockstore *bs;
     journal_flusher_t *flusher;
@@ -29,8 +35,11 @@ struct journal_flusher_co
     std::vector<copy_buffer_t>::iterator it;
     uint64_t offset, len, submit_len, clean_loc, meta_sector, meta_pos;
     std::map<uint64_t, meta_sector_t>::iterator meta_it;
+    std::function<void(ring_data_t*)> simple_callback;
+    std::list<flusher_sync_t>::iterator cur_sync;
     friend class journal_flusher_t;
 public:
+    journal_flusher_co();
     void loop();
 };
 
@@ -38,10 +47,14 @@ public:
 class journal_flusher_t
 {
     int flusher_count;
-    int active_flushers;
+    int sync_threshold;
+    bool sync_required;
     journal_flusher_co *co;
     blockstore *bs;
     friend class journal_flusher_co;
+
+    int active_flushers, active_until_sync;
+    std::list<flusher_sync_t> syncs;
 public:
     std::map<uint64_t, meta_sector_t> meta_sectors;
     std::deque<obj_ver_id> flush_queue;