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Subject[PATCH 5/6 RESEND] statfs: add ST_PRIVATE
Date
This lets userspace query whether a mountpoint was made MS_PRIVATE.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
---
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 2fc6f9c3793c..26cda2586d7e 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -33,6 +33,8 @@ static int flags_by_mnt(int mnt_flags)
flags |= ST_UNBINDABLE;
if (mnt_flags & MNT_SHARED)
flags |= ST_SHARED;
+ else
+ flags |= ST_PRIVATE;
return flags;
}

diff --git a/include/linux/statfs.h b/include/linux/statfs.h
index 5416b2936dd9..1ea4a45aa6c3 100644
--- a/include/linux/statfs.h
+++ b/include/linux/statfs.h
@@ -41,6 +41,7 @@ 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_PRIVATE (1<<18) /* change to private */
#define ST_SHARED (1<<20) /* change to shared */

#endif
--
2.17.0
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