Fixed some problems caused by and unconvered when we don't read the first bitmap on open

storage/maria/ma_bitmap.c:
  Set 'first_bitmap_with_space' to point at first page, if it's was not set before.
  (This is needed as we are not anymore reading the first bitmap into memory on startup)
  Fixed some bugs with full bitmaps and changing bitmaps that was unconvered while finding and fixing
  the above problem.

storage/maria/ma_bitmap.c

@@ -203,6 +203,11 @@ my_bool _ma_bitmap_init(MARIA_SHARE *share, File file)
   bitmap->page= ~(ulonglong) 0;
   bitmap->used_size= bitmap->total_size;
   bfill(bitmap->map, share->block_size, 255);
+  if (share->state.first_bitmap_with_space == ~(ulonglong) 0)
+  {
+    /* Start scanning for free space from start of file */
+    share->state.first_bitmap_with_space = 0;
+  }
   return 0;
 }
 
@@ -540,7 +545,6 @@ static my_bool _ma_change_bitmap_page(MARIA_HA *info,
                                       ulonglong page)
 {
   DBUG_ENTER("_ma_change_bitmap_page");
-  DBUG_ASSERT(page % bitmap->pages_covered == 0);
 
   if (bitmap->changed)
   {
@@ -1158,11 +1162,18 @@ static my_bool find_blob(MARIA_HA *info, ulong length)
       used= allocate_full_pages(bitmap,
                                 (pages >= 65535 ? 65535 : (uint) pages), block,
                                 0);
-      if (!used && move_to_next_bitmap(info, bitmap))
+      if (!used)
+      {
+        if (move_to_next_bitmap(info, bitmap))
           DBUG_RETURN(1);
+      }
+      else
+      {
+        pages-= used;
         info->bitmap_blocks.elements++;
         block++;
-    } while ((pages-= used) != 0);
+      }
+    } while (pages != 0);
   }
   if (rest_length && find_tail(info, rest_length,
                                info->bitmap_blocks.elements++))
@@ -1390,8 +1401,9 @@ my_bool _ma_bitmap_find_place(MARIA_HA *info, MARIA_ROW *row,
   blocks->count= 0;
   blocks->tail_page_skipped= blocks->page_skipped= 0;
   row->extents_count= 0;
+
   /*
-    Reserver place for the following blocks:
+    Reserve place for the following blocks:
      - Head block
      - Full page block
      - Marker block to allow write_block_record() to split full page blocks
@@ -1580,7 +1592,7 @@ static my_bool set_page_bits(MARIA_HA *info, MARIA_FILE_BITMAP *bitmap,
   uchar *data;
   DBUG_ENTER("set_page_bits");
 
-  bitmap_page= page / bitmap->pages_covered;
+  bitmap_page= page - page % bitmap->pages_covered;
   if (bitmap_page != bitmap->page &&
       _ma_change_bitmap_page(info, bitmap, bitmap_page))
     DBUG_RETURN(1);
@@ -1603,8 +1615,8 @@ static my_bool set_page_bits(MARIA_HA *info, MARIA_FILE_BITMAP *bitmap,
   bitmap->changed= 1;
   DBUG_EXECUTE("bitmap", _ma_print_bitmap(bitmap););
   if (fill_pattern != 3 && fill_pattern != 7 &&
-      page < info->s->state.first_bitmap_with_space)
-    info->s->state.first_bitmap_with_space= page;
+      bitmap_page < info->s->state.first_bitmap_with_space)
+    info->s->state.first_bitmap_with_space= bitmap_page;
   DBUG_RETURN(0);
 }
 
@@ -1631,7 +1643,7 @@ static uint get_page_bits(MARIA_HA *info, MARIA_FILE_BITMAP *bitmap,
   uchar *data;
   DBUG_ENTER("get_page_bits");
 
-  bitmap_page= page / bitmap->pages_covered;
+  bitmap_page= page - page % bitmap->pages_covered;
   if (bitmap_page != bitmap->page &&
       _ma_change_bitmap_page(info, bitmap, bitmap_page))
     DBUG_RETURN(~ (uint) 0);
@@ -1679,7 +1691,7 @@ my_bool _ma_reset_full_page_bits(MARIA_HA *info, MARIA_FILE_BITMAP *bitmap,
   DBUG_PRINT("enter", ("page: %lu  page_count: %u", (ulong) page, page_count));
   safe_mutex_assert_owner(&info->s->bitmap.bitmap_lock);
   
-  bitmap_page= page / bitmap->pages_covered;
+  bitmap_page= page - page % bitmap->pages_covered;
   if (bitmap_page != bitmap->page &&
       _ma_change_bitmap_page(info, bitmap, bitmap_page))
     DBUG_RETURN(1);
@@ -1719,8 +1731,8 @@ my_bool _ma_reset_full_page_bits(MARIA_HA *info, MARIA_FILE_BITMAP *bitmap,
     tmp= (1 << bit_count) - 1;
     *data&= ~tmp;
   }
-  if (bitmap->page < (ulonglong) info->s->state.first_bitmap_with_space)
-    info->s->state.first_bitmap_with_space= bitmap->page;
+  if (bitmap_page < info->s->state.first_bitmap_with_space)
+    info->s->state.first_bitmap_with_space= bitmap_page;
   bitmap->changed= 1;
   DBUG_EXECUTE("bitmap", _ma_print_bitmap(bitmap););
   DBUG_RETURN(0);