test: fix direct read/write start page calculation

Signed-off-by: davidko <dko@suse.com>

integration/common/frontend.py

@@ -13,33 +13,36 @@
 
 def readat_direct(dev, offset, length):
     pg = offset // PAGE_SIZE
+    pg_offset = pg * PAGE_SIZE
     in_page_offset = offset % PAGE_SIZE
-    # either read less than a page, or whole pages
+
+    # either read less than a page, or the whole page
     if in_page_offset != 0:
-        assert pg == (offset + length) / PAGE_SIZE
+        assert pg == (offset + length) // PAGE_SIZE
         to_read = PAGE_SIZE
     else:
         assert length % PAGE_SIZE == 0
         to_read = length
-    pg_offset = pg * PAGE_SIZE
 
     f = os.open(dev, os.O_DIRECT | os.O_RDONLY)
     try:
         os.lseek(f, pg_offset, os.SEEK_SET)
         ret = directio.read(f, to_read)
     finally:
         os.close(f)
+
     return ret[in_page_offset : in_page_offset + length]
 
 
 def writeat_direct(dev, offset, data):
     pg = offset // PAGE_SIZE
+    pg_offset = pg * PAGE_SIZE
+
     # don't support across page write
     if len(data) == PAGE_SIZE:
         assert pg == (offset + len(data) - 1) // PAGE_SIZE
     else:
         assert pg == (offset + len(data)) // PAGE_SIZE
-    pg_offset = pg * PAGE_SIZE
 
     f = os.open(dev, os.O_DIRECT | os.O_RDWR)
     m = mmap.mmap(-1, PAGE_SIZE)
@@ -53,6 +56,7 @@ def writeat_direct(dev, offset, data):
     finally:
         m.close()
         os.close(f)
+
     return ret