/usr/src/zfs-0.6.5.6/config/kernel-bio-end-io-t-args.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 # 4.3 API change
dnl # Error argument dropped from bio_endio in favor of newly introduced
dnl # bio->bi_error. This also replaces bio->bi_flags value BIO_UPTODATE.
dnl # Introduced by torvalds/linux@4246a0b63bd8f56a1469b12eafeb875b1041a451
dnl # ("block: add a bi_error field to struct bio").
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BIO_END_IO_T_ARGS], [
AC_MSG_CHECKING([whether bio_end_io_t wants 1 arg])
ZFS_LINUX_TRY_COMPILE([
#include <linux/bio.h>
void wanted_end_io(struct bio *bio) { return; }
bio_end_io_t *end_io __attribute__ ((unused)) = wanted_end_io;
],[
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_1ARG_BIO_END_IO_T, 1,
[bio_end_io_t wants 1 arg])
],[
AC_MSG_RESULT(no)
])
])
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