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Index: linux-2.6.30-rc4-devel/include/linux/bio.h
===================================================================
--- linux-2.6.30-rc4-devel.orig/include/linux/bio.h	2009-05-04 17:00:52.000000000 +0200
+++ linux-2.6.30-rc4-devel/include/linux/bio.h	2009-05-04 17:03:55.000000000 +0200
@@ -505,7 +505,7 @@ static inline char *__bio_kmap_irq(struc
  */
 static inline int bio_has_data(struct bio *bio)
 {
-	return bio && bio->bi_io_vec != NULL;
+	return bio && bio->bi_size != 0;
 }
 
 /*