linux-kernel - [PATCH] Drivers: hv: util: make struct hv_do

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Message-Id: <1414146027-1915-1-git-send-email-vkuznets@redhat.com>
Date:	Fri, 24 Oct 2014 12:20:27 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	linux-api@...r.kernel.org, "K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] Drivers: hv: util: make struct hv_do_fcopy match Hyper-V host messages

An attempt to fix fcopy on i586 (bc5a5b0 Drivers: hv: util: Properly pack the data
for file copy functionality) led to a regression on x86_64 (and actually didn't fix
i586 breakage). Fcopy messages from Hyper-V host come in the following format:

struct do_fcopy_hdr   |   36 bytes
0000                  |    4 bytes
offset                |    8 bytes
size                  |    4 bytes
data                  | 6144 bytes

On x86_64 struct hv_do_fcopy matched this format without ' __attribute__((packed))'
and on i586 adding ' __attribute__((packed))' to it doesn't change anything. Keep
the structure packed and add padding to match re reality. Tested both i586 and x86_64
on Hyper-V Server 2012 R2.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 include/uapi/linux/hyperv.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/hyperv.h b/include/uapi/linux/hyperv.h
index 0a8e6ba..bb1cb73 100644
--- a/include/uapi/linux/hyperv.h
+++ b/include/uapi/linux/hyperv.h
@@ -134,6 +134,7 @@ struct hv_start_fcopy {
 
 struct hv_do_fcopy {
 	struct hv_fcopy_hdr hdr;
+	__u32   pad;
 	__u64	offset;
 	__u32	size;
 	__u8	data[DATA_FRAGMENT];
-- 
1.9.3

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