From 6f49cb2860daa0aef28f1d6ff2ef7ae3ba88f990 Mon Sep 17 00:00:00 2001
From: Wei Liu <liuwe@microsoft.com>
Date: Wed, 17 Nov 2021 13:26:24 +0000
Subject: [PATCH] block_util: add safety comments for `impl ByteValued`

Signed-off-by: Wei Liu <liuwe@microsoft.com>
---
 block_util/src/lib.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/block_util/src/lib.rs b/block_util/src/lib.rs
index 7f2831462..8cd7079e5 100644
--- a/block_util/src/lib.rs
+++ b/block_util/src/lib.rs
@@ -409,8 +409,6 @@ pub struct VirtioBlockConfig {
     pub write_zeroes_may_unmap: u8,
     pub unused1: [u8; 3],
 }
-unsafe impl ByteValued for VirtioBlockConfig {}
-
 #[derive(Copy, Clone, Debug, Default, Versionize)]
 #[repr(C, packed)]
 pub struct VirtioBlockGeometry {
@@ -418,6 +416,9 @@ pub struct VirtioBlockGeometry {
     pub heads: u8,
     pub sectors: u8,
 }
+
+// SAFETY: these data structures only contain a series of integers
+unsafe impl ByteValued for VirtioBlockConfig {}
 unsafe impl ByteValued for VirtioBlockGeometry {}
 
 /// Check if io_uring for block device can be used on the current system, as