diff options
| author |   Horst Hummel <horst.hummel@de.ibm.com> | 2005-05-01 08:58:59 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-01 08:58:59 -0700 |
| commit | ec5883abebb2e249ea8d318cb58fb4b2c269cf10 (patch) | |
| tree | 6a7e08e8247f06e05f3889907b3683b09c21ea78 /drivers | |
| parent | [PATCH] s390: enable write barriers in the dasd driver (diff) | |
| download | linux-dev-ec5883abebb2e249ea8d318cb58fb4b2c269cf10.tar.xz linux-dev-ec5883abebb2e249ea8d318cb58fb4b2c269cf10.zip | |
[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')
| -rw-r--r-- | drivers/s390/block/dasd_eckd.c | 5 |
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 @@ * 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); } |