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[PATCH] s390: don't pad cdl blocks for write requests

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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>
This commit is contained in:
Horst Hummel 2005-05-01 08:58:59 -07:00 committed by Linus Torvalds
parent 6ed93c827e
commit ec5883abeb
1 changed files with 3 additions and 2 deletions
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5
drivers/s390/block/dasd_eckd.c
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@ -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);
}