Hide "Ran out of journal space" log messages by default

src/blockstore/blockstore_impl.h

@@ -266,6 +266,8 @@ class blockstore_impl_t
     int throttle_threshold_us = 50;
     // Maximum writes between automatically added fsync operations
     uint64_t autosync_writes = 128;
+    // Log level (0-10)
+    int log_level = 0;
     /******* END OF OPTIONS *******/
 
     struct ring_consumer_t ring_consumer;

src/blockstore/blockstore_journal.cpp

@@ -113,10 +113,13 @@ int blockstore_journal_check_t::check_available(blockstore_op_t *op, int entries
     if (!right_dir && next_pos >= bs->journal.used_start-bs->journal.block_size)
     {
         // No space in the journal. Wait until used_start changes.
-        printf(
-            "Ran out of journal space (used_start=%08jx, next_free=%08jx, dirty_start=%08jx)\n",
-            bs->journal.used_start, bs->journal.next_free, bs->journal.dirty_start
-        );
+        if (bs->log_level > 5)
+        {
+            printf(
+                "Ran out of journal space (used_start=%08jx, next_free=%08jx, dirty_start=%08jx)\n",
+                bs->journal.used_start, bs->journal.next_free, bs->journal.dirty_start
+            );
+        }
         PRIV(op)->wait_for = WAIT_JOURNAL;
         bs->flusher->request_trim();
         PRIV(op)->wait_detail = bs->journal.used_start;

src/blockstore/blockstore_open.cpp

@@ -101,6 +101,7 @@ void blockstore_impl_t::parse_config(blockstore_config_t & config, bool init)
         config["journal_no_same_sector_overwrites"] == "1" || config["journal_no_same_sector_overwrites"] == "yes";
     journal.inmemory = config["inmemory_journal"] != "false" && config["inmemory_journal"] != "0" &&
         config["inmemory_journal"] != "no";
+    log_level = strtoull(config["log_level"].c_str(), NULL, 10);
     // Validate
     if (journal.sector_count < 2)
     {