linux-kernel - [PATCH 3/3] block nbd: use req.cookie instead of req.handle

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Message-Id: <20230310201525.2615385-4-eblake@redhat.com>
Date:   Fri, 10 Mar 2023 14:15:25 -0600
From:   Eric Blake <eblake@...hat.com>
To:     josef@...icpanda.com, linux-block@...r.kernel.org,
        nbd@...er.debian.org
Cc:     philipp.reisner@...bit.com, lars.ellenberg@...bit.com,
        christoph.boehmwalder@...bit.com, corbet@....net,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] block nbd: use req.cookie instead of req.handle

A good compiler should not compile this any differently, but it seems
nicer to avoid memcpy() when integer assignment will work.

Signed-off-by: Eric Blake <eblake@...hat.com>
---
 drivers/block/nbd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 592cfa8b765a..672fb8d1ce67 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -606,7 +606,7 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index)
 		request.len = htonl(size);
 	}
 	handle = nbd_cmd_handle(cmd);
-	memcpy(request.handle, &handle, sizeof(handle));
+	request.cookie = handle;

 	trace_nbd_send_request(&request, nbd->index, blk_mq_rq_from_pdu(cmd));

@@ -732,7 +732,7 @@ static struct nbd_cmd *nbd_handle_reply(struct nbd_device *nbd, int index,
 	u32 tag;
 	int ret = 0;

-	memcpy(&handle, reply->handle, sizeof(handle));
+	handle = reply->cookie;
 	tag = nbd_handle_to_tag(handle);
 	hwq = blk_mq_unique_tag_to_hwq(tag);
 	if (hwq < nbd->tag_set.nr_hw_queues)
-- 
2.39.2