[patch 8/12] s390: enable write barriers in the dasd driver.

[Martin Schwidefsky]

[patch 8/12] s390: enable write barriers in the dasd driver.

From: Stefan Weinhuber <wein@xxxxxxxxxx>

The DASD device driver never reorders the I/O requests and relies on
the hardware to write all data to nonvolatile storage before signaling
a successful write. Hence, the only thing we have to do to support
write barriers is to set the queue ordered flag.

Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

diffstat:
 drivers/s390/block/dasd.c |    1 +
 1 files changed, 1 insertion(+)

diff -urpN linux-2.6/drivers/s390/block/dasd.c linux-2.6-patched/drivers/s390/block/dasd.c
--- linux-2.6/drivers/s390/block/dasd.c	2005-04-22 15:45:04.000000000 +0200
+++ linux-2.6-patched/drivers/s390/block/dasd.c	2005-04-22 15:45:04.000000000 +0200
@@ -1635,6 +1635,7 @@ dasd_setup_queue(struct dasd_device * de
 	blk_queue_max_hw_segments(device->request_queue, -1L);
 	blk_queue_max_segment_size(device->request_queue, -1L);
 	blk_queue_segment_boundary(device->request_queue, -1L);
+	blk_queue_ordered(device->request_queue, 1);
 }
 
 /*
-
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