diff mbox

[3/6] statfs: add ST_UNBINDABLE

Message ID 20180413161126.31313-4-christian.brauner@ubuntu.com (mailing list archive)
State New, archived
Headers show

Commit Message

Christian Brauner April 13, 2018, 4:11 p.m. UTC 
This lets userspace query whether a mountpoint was made MS_UNBINDABLE.

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

Patch

diff --git a/fs/statfs.c b/fs/statfs.c
index 5b2a24f0f263..61b3063d3921 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -29,6 +29,8 @@  static int flags_by_mnt(int mnt_flags)
 		flags |= ST_NODIRATIME;
 	if (mnt_flags & MNT_RELATIME)
 		flags |= ST_RELATIME;
+	if (mnt_flags & MNT_UNBINDABLE)
+		flags |= ST_UNBINDABLE;
 	return flags;
 }
 
diff --git a/include/linux/statfs.h b/include/linux/statfs.h
index b336c04e793c..e1b84d0388c1 100644
--- a/include/linux/statfs.h
+++ b/include/linux/statfs.h
@@ -40,5 +40,6 @@  struct kstatfs {
 #define ST_NOATIME	(1<<10) /* do not update access times */
 #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 */
 
 #endif