--- IO-AIO/AIO.xs	2020/02/26 15:49:25	1.282
+++ IO-AIO/AIO.xs	2020/09/03 17:20:45	1.283
@@ -346,7 +346,7 @@
   req->flags |= EIO_FLAG_PTR1_FREE;
 
   /* heuristic: start with 512 bytes (8 extents), and if that isn't enough, */
-  /* increase in 3.5kb steps */
+  /* increase in fixed steps */
   if (count < 0)
     count = 8;
 
@@ -409,11 +409,11 @@
         {
           struct fiemap_extent *e = incmap->fm_extents + count;
 
+          fiemap->fm_extents [fiemap->fm_mapped_extents++] = *e;
+
           if (e->fe_logical + e->fe_length >= end_offset)
             goto done;
 
-          fiemap->fm_extents [fiemap->fm_mapped_extents++] = *e;
-
           if (e->fe_flags & FIEMAP_EXTENT_LAST)
             goto done;