/usr/src/zfs-0.6.5.6/config/kernel-fsync.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.
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dnl # Linux 2.6.x - 2.6.34 API
dnl #
AC_DEFUN([ZFS_AC_KERNEL_FSYNC_WITH_DENTRY], [
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
int test_fsync(struct file *f, struct dentry *dentry, int x)
{ return 0; }
static const struct file_operations
fops __attribute__ ((unused)) = {
.fsync = test_fsync,
};
],[
],[
AC_MSG_RESULT([dentry])
AC_DEFINE(HAVE_FSYNC_WITH_DENTRY, 1,
[fops->fsync() with dentry])
],[
])
])
dnl #
dnl # Linux 2.6.35 - Linux 3.0 API
dnl #
AC_DEFUN([ZFS_AC_KERNEL_FSYNC_WITHOUT_DENTRY], [
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
int test_fsync(struct file *f, int x) { return 0; }
static const struct file_operations
fops __attribute__ ((unused)) = {
.fsync = test_fsync,
};
],[
],[
AC_MSG_RESULT([no dentry])
AC_DEFINE(HAVE_FSYNC_WITHOUT_DENTRY, 1,
[fops->fsync() without dentry])
],[
])
])
dnl #
dnl # Linux 3.1 - 3.x API
dnl #
AC_DEFUN([ZFS_AC_KERNEL_FSYNC_RANGE], [
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
int test_fsync(struct file *f, loff_t a, loff_t b, int c)
{ return 0; }
static const struct file_operations
fops __attribute__ ((unused)) = {
.fsync = test_fsync,
};
],[
],[
AC_MSG_RESULT([range])
AC_DEFINE(HAVE_FSYNC_RANGE, 1,
[fops->fsync() with range])
],[
])
])
AC_DEFUN([ZFS_AC_KERNEL_FSYNC], [
AC_MSG_CHECKING([whether fops->fsync() wants])
ZFS_AC_KERNEL_FSYNC_WITH_DENTRY
ZFS_AC_KERNEL_FSYNC_WITHOUT_DENTRY
ZFS_AC_KERNEL_FSYNC_RANGE
])
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