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authorHorst Hummel <horst.hummel@de.ibm.com>2005-05-01 08:58:59 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 08:58:59 -0700
commitec5883abebb2e249ea8d318cb58fb4b2c269cf10 (patch)
tree6a7e08e8247f06e05f3889907b3683b09c21ea78 /drivers/s390/block/dasd_eckd.c
parent6ed93c827eea181d87ce078cd1d671128c030b5a (diff)
[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 <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/s390/block/dasd_eckd.c')
-rw-r--r--drivers/s390/block/dasd_eckd.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 838aedf78a5..811060e10c0 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -7,7 +7,7 @@
* Bugreports.to..: <Linux390@de.ibm.com>
* (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 * 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);
}