/usr/src/zfs-0.6.5.6/config/kernel-show-options.m4 is in zfs-dkms 0.6.5.6-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | dnl #
dnl # Linux 3.3 API
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SHOW_OPTIONS], [
AC_MSG_CHECKING([whether sops->show_options() wants dentry])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
int show_options (struct seq_file * x, struct dentry * y) { return 0; };
static struct super_operations sops __attribute__ ((unused)) = {
.show_options = show_options,
};
],[
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_SHOW_OPTIONS_WITH_DENTRY, 1,
[sops->show_options() with dentry])
],[
AC_MSG_RESULT([no])
])
])
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