Commit ec5883ab authored May 01, 2005 by Horst Hummel Committed by Linus Torvalds May 01, 2005

[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>

parent 6ed93c82

drivers/s390/block/dasd_eckd.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -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);
		}