[PATCH] restore sane ->umount_begin() API

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 678c02f..a452ac6 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -224,12 +224,11 @@
 }
 
 static void
-v9fs_umount_begin(struct vfsmount *vfsmnt, int flags)
+v9fs_umount_begin(struct super_block *sb)
 {
-	struct v9fs_session_info *v9ses = vfsmnt->mnt_sb->s_fs_info;
+	struct v9fs_session_info *v9ses = sb->s_fs_info;
 
-	if (flags & MNT_FORCE)
-		v9fs_session_cancel(v9ses);
+	v9fs_session_cancel(v9ses);
 }
 
 static const struct super_operations v9fs_super_ops = {