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

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c
index da485f0..9df7fd6 100644
--- a/fs/ecryptfs/super.c
+++ b/fs/ecryptfs/super.c
@@ -131,9 +131,9 @@
  * Prints the mount options for a given superblock.
  * Returns zero; does not fail.
  */
-static int ecryptfs_show_options(struct seq_file *m, struct vfsmount *mnt)
+static int ecryptfs_show_options(struct seq_file *m, struct dentry *root)
 {
-	struct super_block *sb = mnt->mnt_sb;
+	struct super_block *sb = root->d_sb;
 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
 		&ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
 	struct ecryptfs_global_auth_tok *walker;