diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 21629ae..d0f4021 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1284,6 +1284,7 @@
 					rdev_dec_pending(conf->mirrors[i].rdev, mddev);
 				} else {
 					/* fixup the bio for reuse */
+					int size;
 					sbio->bi_vcnt = vcnt;
 					sbio->bi_size = r1_bio->sectors << 9;
 					sbio->bi_idx = 0;
@@ -1297,10 +1298,20 @@
 					sbio->bi_sector = r1_bio->sector +
 						conf->mirrors[i].rdev->data_offset;
 					sbio->bi_bdev = conf->mirrors[i].rdev->bdev;
-					for (j = 0; j < vcnt ; j++)
-						memcpy(page_address(sbio->bi_io_vec[j].bv_page),
+					size = sbio->bi_size;
+					for (j = 0; j < vcnt ; j++) {
+						struct bio_vec *bi;
+						bi = &sbio->bi_io_vec[j];
+						bi->bv_offset = 0;
+						if (size > PAGE_SIZE)
+							bi->bv_len = PAGE_SIZE;
+						else
+							bi->bv_len = size;
+						size -= PAGE_SIZE;
+						memcpy(page_address(bi->bv_page),
 						       page_address(pbio->bi_io_vec[j].bv_page),
 						       PAGE_SIZE);
+					}
 
 				}
 			}