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authorStefan Weinhuber <wein@de.ibm.com>2005-05-01 08:58:59 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 08:58:59 -0700
commit6ed93c827eea181d87ce078cd1d671128c030b5a (patch)
treedf6dc11996ff5c2ec3ddf32b754d051d3ec33307
parentf24acd4503270ed4c842c8fef0b71105285e0a06 (diff)
downloadblackbird-op-linux-6ed93c827eea181d87ce078cd1d671128c030b5a.tar.gz
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[PATCH] s390: enable write barriers in the dasd driver
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>
-rw-r--r--drivers/s390/block/dasd.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 826fd238034d..02cfe244e069 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -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);
}
/*
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