/usr/src/zfs-0.6.5.6/config/kernel-truncate-range.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 23 24 | dnl #
dnl # 3.5.0 API change
dnl # torvalds/linux@17cf28afea2a1112f240a3a2da8af883be024811 removed
dnl # truncate_range(). The file hole punching functionality is now
dnl # provided by fallocate()
dnl #
AC_DEFUN([ZFS_AC_KERNEL_TRUNCATE_RANGE], [
AC_MSG_CHECKING([whether iops->truncate_range() exists])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
void truncate_range(struct inode *inode, loff_t start,
loff_t end) { return; }
static struct inode_operations iops __attribute__ ((unused)) = {
.truncate_range = truncate_range,
};
],[
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
[iops->truncate_range() exists])
],[
AC_MSG_RESULT(no)
])
])
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