block: silently error an unsupported barrier bio
This fixes a "regression" from 2.6.28, where the barrier probes that file
systems may do would trigger additional end request warnings in dmesg.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/blk-core.c b/block/blk-core.c
index 9e2e86f..ae75c04 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1451,6 +1451,11 @@
err = -EOPNOTSUPP;
goto end_io;
}
+ if (bio_barrier(bio) && bio_has_data(bio) &&
+ (q->next_ordered == QUEUE_ORDERED_NONE)) {
+ err = -EOPNOTSUPP;
+ goto end_io;
+ }
ret = q->make_request_fn(q, bio);
} while (ret);