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authorHorst Hummel <horst.hummel@de.ibm.com>2005-05-01 11:58:59 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 11:58:59 -0400
commitec5883abebb2e249ea8d318cb58fb4b2c269cf10 (patch)
tree6a7e08e8247f06e05f3889907b3683b09c21ea78 /drivers/s390
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')
-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 838aedf78a56..811060e10c00 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -7,7 +7,7 @@
7 * Bugreports.to..: <Linux390@de.ibm.com> 7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000 8 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
9 * 9 *
10 * $Revision: 1.69 $ 10 * $Revision: 1.71 $
11 */ 11 */
12 12
13#include <linux/config.h> 13#include <linux/config.h>
@@ -1101,7 +1101,8 @@ dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
1101 if (dasd_eckd_cdl_special(blk_per_trk, recid)){ 1101 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1102 rcmd |= 0x8; 1102 rcmd |= 0x8;
1103 count = dasd_eckd_cdl_reclen(recid); 1103 count = dasd_eckd_cdl_reclen(recid);
1104 if (count < blksize) 1104 if (count < blksize &&
1105 rq_data_dir(req) == READ)
1105 memset(dst + count, 0xe5, 1106 memset(dst + count, 0xe5,
1106 blksize - count); 1107 blksize - count);
1107 } 1108 }