From ec5883abebb2e249ea8d318cb58fb4b2c269cf10 Mon Sep 17 00:00:00 2001 From: Horst Hummel Date: Sun, 1 May 2005 08:58:59 -0700 Subject: [PATCH] [PATCH] s390: don't pad cdl blocks for write requests 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/s390/block/dasd_eckd.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 838aedf78a56..811060e10c00 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -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 * device, struct request *req) 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); } -- 2.20.1