[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>
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@ -7,7 +7,7 @@
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
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*
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* $Revision: 1.69 $
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* $Revision: 1.71 $
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*/
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#include <linux/config.h>
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@ -1101,7 +1101,8 @@ dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
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if (dasd_eckd_cdl_special(blk_per_trk, recid)){
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rcmd |= 0x8;
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count = dasd_eckd_cdl_reclen(recid);
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if (count < blksize)
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if (count < blksize &&
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rq_data_dir(req) == READ)
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memset(dst + count, 0xe5,
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blksize - count);
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}
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