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[PATCH] s390: enable write barriers in the dasd driver

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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@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Stefan Weinhuber 2005-05-01 08:58:59 -07:00 committed by Linus Torvalds
parent f24acd4503
commit 6ed93c827e
1 changed files with 1 additions and 0 deletions
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drivers/s390/block/dasd.c
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@ -1635,6 +1635,7 @@ dasd_setup_queue(struct dasd_device * device)
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);
}
/*