Commit 6ed93c82 authored by Stefan Weinhuber's avatar Stefan Weinhuber Committed by Linus Torvalds

[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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent f24acd45
...@@ -1635,6 +1635,7 @@ dasd_setup_queue(struct dasd_device * device) ...@@ -1635,6 +1635,7 @@ dasd_setup_queue(struct dasd_device * device)
blk_queue_max_hw_segments(device->request_queue, -1L); blk_queue_max_hw_segments(device->request_queue, -1L);
blk_queue_max_segment_size(device->request_queue, -1L); blk_queue_max_segment_size(device->request_queue, -1L);
blk_queue_segment_boundary(device->request_queue, -1L); blk_queue_segment_boundary(device->request_queue, -1L);
blk_queue_ordered(device->request_queue, 1);
} }
/* /*
......
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