Optimize WA - do not move to the next journal sector until the actual write

src/blockstore/blockstore_impl.cpp

@@ -229,6 +229,8 @@ void blockstore_impl_t::loop()
         {
             // Mark journal sector writes as submitted
             journal.sector_info[s].submit_id = 0;
+            if (journal.sector_info[s].submit_id)
+                journal.sector_info[s].written = true;
         }
         journal.submitting_sectors.clear();
         if ((initial_ring_space - ringloop->space_left()) > 0)

src/blockstore/blockstore_journal.cpp

@@ -178,7 +178,7 @@ void blockstore_impl_t::prepare_journal_sector_write(int cur_sector, blockstore_
         // Caller must ensure availability of an SQE
         assert(sqe != NULL);
         ring_data_t *data = ((ring_data_t*)sqe->user_data);
-        journal.sector_info[cur_sector].written = true;
+        // <written> flag will be set at the moment of actual submission
         journal.sector_info[cur_sector].submit_id = ++journal.submit_id;
         assert(journal.submit_id != 0); // check overflow
         journal.submitting_sectors.push_back(cur_sector);