Fix old_clean_loc treatment (cannot persist sparse_hash_map iterator)

Makefile

@@ -4,9 +4,9 @@ all: $(BLOCKSTORE_OBJS) test test_blockstore libfio_blockstore.so
 clean:
 	rm -f *.o
 crc32c.o: crc32c.c
-	g++ -fPIC -c -o $@ $<
+	g++ -g -O3 -fPIC -c -o $@ $<
 %.o: %.cpp allocator.h blockstore_flush.h blockstore.h blockstore_init.h blockstore_journal.h crc32c.h ringloop.h xor.h timerfd_interval.h
-	g++ -g -Wall -Wno-sign-compare -Wno-parentheses -fPIC -c -o $@ $<
+	g++ -g -O3 -Wall -Wno-sign-compare -Wno-parentheses -fPIC -c -o $@ $<
 test: test.cpp
 	g++ -g -O3 -o test -luring test.cpp
 test_blockstore: $(BLOCKSTORE_OBJS) test_blockstore.cpp
@@ -14,4 +14,4 @@ test_blockstore: $(BLOCKSTORE_OBJS) test_blockstore.cpp
 test_allocator: test_allocator.cpp allocator.o
 	g++ -g -o test_allocator test_allocator.cpp allocator.o
 libfio_blockstore.so: fio_engine.cpp $(BLOCKSTORE_OBJS)
-	g++ -g -Wno-pointer-arith -fPIC -shared -luring -o libfio_blockstore.so fio_engine.cpp $(BLOCKSTORE_OBJS)
+	g++ -g -O3 -Wno-pointer-arith -fPIC -shared -luring -o libfio_blockstore.so fio_engine.cpp $(BLOCKSTORE_OBJS)

blockstore_flush.cpp

@@ -226,20 +226,21 @@ resume_0:
             wait_state = 0;
             goto resume_0;
         }
+        // Find it in clean_db
+        {
+            auto clean_it = bs->clean_db.find(cur.oid);
+            old_clean_loc = (clean_it != bs->clean_db.end() ? clean_it->second.location : UINT64_MAX);
+        }
         if (clean_loc == UINT64_MAX)
         {
-            // Find it in clean_db
-            clean_it = bs->clean_db.find(cur.oid);
-            if (clean_it == bs->clean_db.end())
+            if (old_clean_loc == UINT64_MAX)
             {
                 // Object not present at all. This is a bug.
                 throw std::runtime_error("BUG: Object we are trying to flush is not allocated on the data device");
             }
             else
-                clean_loc = clean_it->second.location;
+                clean_loc = old_clean_loc;
         }
-        else
-            clean_it = bs->clean_db.end();
         // Also we need to submit the metadata read. We do a read-modify-write for every operation.
         // But we must check if the same sector is already in memory.
         // Another option is to keep all raw metadata in memory all the time. Maybe I'll do it sometime...
@@ -383,9 +384,9 @@ resume_0:
             }
         }
         // Update clean_db and dirty_db, free old data locations
-        if (clean_it != bs->clean_db.end() && clean_it->second.location != clean_loc)
+        if (old_clean_loc != clean_loc)
         {
-            bs->data_alloc->set(clean_it->second.location >> bs->block_order, false);
+            bs->data_alloc->set(old_clean_loc >> bs->block_order, false);
         }
         bs->clean_db[cur.oid] = {
             .version = cur.version,

blockstore_flush.h

@@ -31,10 +31,9 @@ class journal_flusher_co
     bool skip_copy;
     obj_ver_id cur;
     std::map<obj_ver_id, dirty_entry>::iterator dirty_it, dirty_start, dirty_end;
-    spp::sparse_hash_map<object_id, clean_entry, oid_hash>::iterator clean_it;
     std::vector<copy_buffer_t> v;
     std::vector<copy_buffer_t>::iterator it;
-    uint64_t offset, len, submit_len, clean_loc, meta_sector, meta_pos;
+    uint64_t offset, len, submit_len, clean_loc, old_clean_loc, meta_sector, meta_pos;
     std::map<uint64_t, meta_sector_t>::iterator meta_it;
     std::map<object_id, uint64_t>::iterator repeat_it;
     std::map<uint64_t, uint64_t>::iterator journal_used_it;