From: Stefan Weinhuber Date: Sun, 1 May 2005 15:58:59 +0000 (-0700) Subject: [PATCH] s390: enable write barriers in the dasd driver X-Git-Tag: v2.6.12-rc4~136^2~105 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ed93c827eea181d87ce078cd1d671128c030b5a;p=linux-2.6 [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 826fd23803..02cfe244e0 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); } /*