From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262058AbVDVPMj (ORCPT ); Fri, 22 Apr 2005 11:12:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261964AbVDVPKW (ORCPT ); Fri, 22 Apr 2005 11:10:22 -0400 Received: from mtagate2.de.ibm.com ([195.212.29.151]:33704 "EHLO mtagate2.de.ibm.com") by vger.kernel.org with ESMTP id S261969AbVDVPC6 (ORCPT ); Fri, 22 Apr 2005 11:02:58 -0400 Date: Fri, 22 Apr 2005 17:02:23 +0200 From: Martin Schwidefsky To: akpm@osdl.org, linux-kernel@vger.kernel.org Subject: [patch 9/12] s390: don't pad cdl blocks for write requests. Message-ID: <20050422150223.GI17508@mschwid3.boeblingen.de.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org [patch 9/12] s390: don't pad cdl blocks for write requests. From: Horst Hummel The first blocks on a cdl formatted dasd device are smaller than the blocksize of the device. Read requests are padded with a 'e5' pattern. Write requests should not pad the (user) buffer with 'e5' because a write request is not allowed to modify the buffer. Signed-off-by: Martin Schwidefsky diffstat: drivers/s390/block/dasd_eckd.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff -urpN linux-2.6/drivers/s390/block/dasd_eckd.c linux-2.6-patched/drivers/s390/block/dasd_eckd.c --- linux-2.6/drivers/s390/block/dasd_eckd.c 2005-04-22 15:44:48.000000000 +0200 +++ linux-2.6-patched/drivers/s390/block/dasd_eckd.c 2005-04-22 15:45:05.000000000 +0200 @@ -7,7 +7,7 @@ * Bugreports.to..: * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000 * - * $Revision: 1.69 $ + * $Revision: 1.71 $ */ #include @@ -1101,7 +1101,8 @@ dasd_eckd_build_cp(struct dasd_device * if (dasd_eckd_cdl_special(blk_per_trk, recid)){ rcmd |= 0x8; count = dasd_eckd_cdl_reclen(recid); - if (count < blksize) + if (count < blksize && + rq_data_dir(req) == READ) memset(dst + count, 0xe5, blksize - count); }