Make sure MNT_MOUNTED isn't cleared on remount

Originally found by Anton Blanchard, this patch makes sure
we keep the MNT_MOUNTED flag set in do_remount(). Without this
scalability suffers pretty badly.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index c1632069b06c..5459a05e8aa5 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1731,6 +1731,7 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
         if (!err) {
                 vfsmount_write_lock();
                 mnt_flags |= path->mnt->mnt_flags & MNT_PNODE_MASK;
+                mnt_flags |= path->mnt->mnt_flags & MNT_MOUNTED;
                 path->mnt->mnt_flags = mnt_flags;
                 vfsmount_write_unlock();
         }