[patch 9/12] s390: don't pad cdl blocks for write requests.
From: Horst Hummel <[email protected]>
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 <[email protected]>
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..: <[email protected]>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
- * $Revision: 1.69 $
+ * $Revision: 1.71 $
*/
#include <linux/config.h>
@@ -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);
}
-
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