It doesn't make sense to enable merge because the I/O
submitted to backing file is handled page by page.
Signed-off-by: Ming Lei <ming....@canonical.com>
---
drivers/block/loop.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 1bee523..e9f563d 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1572,6 +1572,12 @@ static int loop_add(struct loop_device **l, int i)
}
lo->lo_queue->queuedata = lo;
+ /*
+ * It doesn't make sense to enable merge because the I/O
+ * submitted to backing file is handled page by page.
+ */
+ queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, lo->lo_queue);
+
INIT_LIST_HEAD(&lo->write_cmd_head);
INIT_WORK(&lo->write_work, loop_queue_write_work);
--
1.9.1
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