diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 45745aae4786c08cbd6789dea03a9b8be1354af5..ae438d02a42263f299c2d359aa81cd851e97ac4c 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -900,7 +900,7 @@ static int ceph_writepages_start(struct address_space *mapping,
 		}
 
 		/* submit the write */
-		offset = req->r_data_out.pages[0]->index << PAGE_CACHE_SHIFT;
+		offset = page_offset(req->r_data_out.pages[0]);
 		len = min((snap_size ? snap_size : i_size_read(inode)) - offset,
 			  (u64)locked_pages << PAGE_CACHE_SHIFT);
 		dout("writepages got %d pages at %llu~%llu\n",