vfs: switch ->show_options() to struct dentry *

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index a7340e7..e130bd4 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -258,9 +258,9 @@
 	call_rcu(&inode->i_rcu, hostfs_i_callback);
 }
 
-static int hostfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
+static int hostfs_show_options(struct seq_file *seq, struct dentry *root)
 {
-	const char *root_path = vfs->mnt_sb->s_fs_info;
+	const char *root_path = root->d_sb->s_fs_info;
 	size_t offset = strlen(root_ino) + 1;
 
 	if (strlen(root_path) > offset)