kernel-current_bio_tail.m4

dnl #
dnl # 2.6.34 API change
dnl # current->bio_tail and current->bio_list were struct bio pointers prior to
dnl # Linux 2.6.34. They were refactored into a struct bio_list pointer called
dnl # current->bio_list in Linux 2.6.34.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_CURRENT_BIO_TAIL], [
	AC_MSG_CHECKING([whether current->bio_tail exists])
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/sched.h>
	],[
		current->bio_tail = (struct bio **) NULL;
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_CURRENT_BIO_TAIL, 1,
		    [current->bio_tail exists])
	],[
		AC_MSG_RESULT(no)
		AC_MSG_CHECKING([whether current->bio_list exists])
		ZFS_LINUX_TRY_COMPILE([
			#include <linux/sched.h>
		],[
			current->bio_list = (struct bio_list *) NULL;
		],[
			AC_MSG_RESULT(yes)
			AC_DEFINE(HAVE_CURRENT_BIO_LIST, 1,
			    [current->bio_list exists])
		],[
			AC_MSG_ERROR(no - Please file a bug report at
			    https://github.com/zfsonlinux/zfs/issues/new)
		])
	])
])