mnt_flags fixes in do_remount()
* need vfsmount_lock over modifying it
* need to preserve MNT_SHARED/MNT_UNBINDABLE
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namespace.c b/fs/namespace.c
index 4de493e..779293e 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1536,8 +1536,12 @@
err = change_mount_flags(path->mnt, flags);
else
err = do_remount_sb(sb, flags, data, 0);
- if (!err)
+ if (!err) {
+ spin_lock(&vfsmount_lock);
+ mnt_flags |= path->mnt->mnt_flags & MNT_PNODE_MASK;
path->mnt->mnt_flags = mnt_flags;
+ spin_unlock(&vfsmount_lock);
+ }
up_write(&sb->s_umount);
if (!err) {
security_sb_post_remount(path->mnt, flags, data);