/usr/src/zfs-0.6.5.6/config/kernel-mk-request-fn.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 3.2 API Change
dnl # make_request_fn returns void instead of int.
dnl #
dnl # Linux 4.4 API Change
dnl # make_request_fn returns blk_qc_t.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_MAKE_REQUEST_FN], [
AC_MSG_CHECKING([whether make_request_fn() returns int])
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
int make_request(struct request_queue *q, struct bio *bio)
{
return (0);
}
],[
blk_queue_make_request(NULL, &make_request);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(MAKE_REQUEST_FN_RET, int,
[make_request_fn() returns int])
AC_DEFINE(HAVE_MAKE_REQUEST_FN_RET_INT, 1,
[Noting that make_request_fn() returns int])
],[
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether make_request_fn() returns void])
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
void make_request(struct request_queue *q, struct bio *bio)
{
return;
}
],[
blk_queue_make_request(NULL, &make_request);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(MAKE_REQUEST_FN_RET, void,
[make_request_fn() returns void])
],[
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether make_request_fn() returns blk_qc_t])
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
blk_qc_t make_request(struct request_queue *q, struct bio *bio)
{
return (BLK_QC_T_NONE);
}
],[
blk_queue_make_request(NULL, &make_request);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(MAKE_REQUEST_FN_RET, blk_qc_t,
[make_request_fn() returns blk_qc_t])
AC_DEFINE(HAVE_MAKE_REQUEST_FN_RET_QC, 1,
[Noting that make_request_fn() returns blk_qc_t])
],[
AC_MSG_ERROR(no - Please file a bug report at
https://github.com/zfsonlinux/zfs/issues/new)
])
])
])
])
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