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From: Christian Brauner <christian.brauner@ubuntu.com>
To: viro@zeniv.linux.org.uk, tglx@linutronix.de,
	kstewart@linuxfoundation.org, gregkh@linuxfoundation.org,
	pombredanne@nexb.com, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, serge@hallyn.com
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Subject: [PATCH 4/6] statfs: add ST_SHARED
Date: Fri, 13 Apr 2018 18:11:24 +0200	[thread overview]
Message-ID: <20180413161126.31313-5-christian.brauner@ubuntu.com> (raw)
In-Reply-To: <20180413161126.31313-1-christian.brauner@ubuntu.com>

This lets userspace query whether a mountpoint was made MS_SHARED.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
 fs/statfs.c            | 2 ++
 include/linux/statfs.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/fs/statfs.c b/fs/statfs.c
index 61b3063d3921..2fc6f9c3793c 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -31,6 +31,8 @@ static int flags_by_mnt(int mnt_flags)
 		flags |= ST_RELATIME;
 	if (mnt_flags & MNT_UNBINDABLE)
 		flags |= ST_UNBINDABLE;
+	if (mnt_flags & MNT_SHARED)
+		flags |= ST_SHARED;
 	return flags;
 }
 
diff --git a/include/linux/statfs.h b/include/linux/statfs.h
index e1b84d0388c1..5416b2936dd9 100644
--- a/include/linux/statfs.h
+++ b/include/linux/statfs.h
@@ -41,5 +41,6 @@ struct kstatfs {
 #define ST_NODIRATIME	(1<<11) /* do not update directory access times */
 #define ST_RELATIME	(1<<12) /* update atime relative to mtime/ctime */
 #define ST_UNBINDABLE	(1<<17)	/* change to unbindable */
+#define ST_SHARED	(1<<20)	/* change to shared */
 
 #endif
-- 
2.17.0

  parent reply	other threads:[~2018-04-13 16:11 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-13 16:11 [PATCH 0/6] statfs: handle mount propagation Christian Brauner
2018-04-13 16:11 ` [PATCH 1/6] fs: use << for MS_* flags Christian Brauner
2018-04-13 16:45   ` Randy Dunlap
2018-04-13 20:19     ` Greg KH
2018-04-13 16:11 ` [PATCH 2/6] statfs: use << to align with fs header Christian Brauner
2018-04-13 16:47   ` Randy Dunlap
2018-04-13 17:35   ` Andreas Dilger
2018-04-13 17:55     ` Randy Dunlap
2018-04-13 18:32       ` Christian Brauner
2018-04-13 16:11 ` [PATCH 3/6] statfs: add ST_UNBINDABLE Christian Brauner
2018-04-13 16:11 ` Christian Brauner [this message]
2018-04-13 16:11 ` [PATCH 5/6] statfs: add ST_PRIVATE Christian Brauner
2018-04-13 16:11 ` [PATCH 6/6] statfs: add ST_SLAVE Christian Brauner

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