From 061d1a51097c3c025ff46173f10aa135f9a610d4 Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Thu, 22 Mar 2018 14:05:17 +0100
Subject: libmount: include sys/mount.h only if necessary

Addresses: https://github.com/systemd/systemd/issues/8507
Signed-off-by: Karel Zak <kzak@redhat.com>
---
 libmount/src/libmount.h.in | 9 ++++++++-
 sys-utils/fstrim.c         | 4 +---
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/libmount/src/libmount.h.in b/libmount/src/libmount.h.in
index 8f323fcbf..11fd759fa 100644
--- a/libmount/src/libmount.h.in
+++ b/libmount/src/libmount.h.in
@@ -28,7 +28,14 @@ extern "C" {
 #include <stdio.h>
 #include <mntent.h>
 #include <sys/types.h>
-#include <sys/mount.h>
+
+/* Make sure libc MS_* definitions are used by default. Note that MS_* flags
+ * may be already defined by linux/fs.h or another file -- in this case we
+ * don't want to include sys/mount.h at all to avoid collisions.
+ */
+#ifndef MS_RDONLY
+# include <sys/mount.h>
+#endif
 
 #define LIBMOUNT_VERSION   "@LIBMOUNT_VERSION@"
 #define LIBMOUNT_MAJOR_VERSION   @LIBMOUNT_MAJOR_VERSION@
diff --git a/sys-utils/fstrim.c b/sys-utils/fstrim.c
index 53ac594c0..ce52063e1 100644
--- a/sys-utils/fstrim.c
+++ b/sys-utils/fstrim.c
@@ -35,6 +35,7 @@
 
 #include <sys/ioctl.h>
 #include <sys/stat.h>
+#include <linux/fs.h>
 
 #include "nls.h"
 #include "strutils.h"
@@ -46,9 +47,6 @@
 #include <libmount.h>
 
 
-/* We cannot include linux/fs.h due to MS_* constants collision with
- * sys/mount.h (and libmount.h)
- */
 #ifndef FITRIM
 struct fstrim_range {
 	uint64_t start;
