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dnl #
dnl # Check for direct IO interfaces.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_DIRECT_IO], [
ZFS_LINUX_TEST_SRC([direct_io_iter], [
#include <linux/fs.h>
static ssize_t test_direct_IO(struct kiocb *kiocb,
struct iov_iter *iter) { return 0; }
static const struct address_space_operations
aops __attribute__ ((unused)) = {
.direct_IO = test_direct_IO,
};
],[])
ZFS_LINUX_TEST_SRC([direct_io_iter_offset], [
#include <linux/fs.h>
static ssize_t test_direct_IO(struct kiocb *kiocb,
struct iov_iter *iter, loff_t offset) { return 0; }
static const struct address_space_operations
aops __attribute__ ((unused)) = {
.direct_IO = test_direct_IO,
};
],[])
ZFS_LINUX_TEST_SRC([direct_io_iter_rw_offset], [
#include <linux/fs.h>
static ssize_t test_direct_IO(int rw, struct kiocb *kiocb,
struct iov_iter *iter, loff_t offset) { return 0; }
static const struct address_space_operations
aops __attribute__ ((unused)) = {
.direct_IO = test_direct_IO,
};
],[])
ZFS_LINUX_TEST_SRC([direct_io_iovec], [
#include <linux/fs.h>
static ssize_t test_direct_IO(int rw, struct kiocb *kiocb,
const struct iovec *iov, loff_t offset,
unsigned long nr_segs) { return 0; }
static const struct address_space_operations
aops __attribute__ ((unused)) = {
.direct_IO = test_direct_IO,
};
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO], [
dnl #
dnl # Linux 4.6.x API change
dnl #
AC_MSG_CHECKING([whether aops->direct_IO() uses iov_iter])
ZFS_LINUX_TEST_RESULT([direct_io_iter], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER, 1,
[aops->direct_IO() uses iov_iter without rw])
],[
AC_MSG_RESULT([no])
dnl #
dnl # Linux 4.1.x API change
dnl #
AC_MSG_CHECKING(
[whether aops->direct_IO() uses offset])
ZFS_LINUX_TEST_RESULT([direct_io_iter_offset], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER_OFFSET, 1,
[aops->direct_IO() uses iov_iter with offset])
],[
AC_MSG_RESULT([no])
dnl #
dnl # Linux 3.16.x API change
dnl #
AC_MSG_CHECKING(
[whether aops->direct_IO() uses rw and offset])
ZFS_LINUX_TEST_RESULT([direct_io_iter_rw_offset], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER_RW_OFFSET, 1,
[aops->direct_IO() uses iov_iter with ]
[rw and offset])
],[
AC_MSG_RESULT([no])
dnl #
dnl # Ancient Linux API (predates git)
dnl #
AC_MSG_CHECKING(
[whether aops->direct_IO() uses iovec])
ZFS_LINUX_TEST_RESULT([direct_io_iovec], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_DIRECT_IO_IOVEC, 1,
[aops->direct_IO() uses iovec])
],[
ZFS_LINUX_TEST_ERROR([direct IO])
AC_MSG_RESULT([no])
])
])
])
])
])
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