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dnl #
dnl # Linux 4.6.x API change
dnl #
AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER], [
AC_MSG_CHECKING([whether aops->direct_IO() uses iov_iter])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
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,
};
],[
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER, 1,
[aops->direct_IO() uses iov_iter without rw])
zfs_ac_direct_io="yes"
],[
AC_MSG_RESULT([no])
])
])
dnl #
dnl # Linux 4.1.x API change
dnl #
AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER_OFFSET], [
AC_MSG_CHECKING(
[whether aops->direct_IO() uses iov_iter with offset])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
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,
};
],[
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER_OFFSET, 1,
[aops->direct_IO() uses iov_iter with offset])
zfs_ac_direct_io="yes"
],[
AC_MSG_RESULT([no])
])
])
dnl #
dnl # Linux 3.16.x API change
dnl #
AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER_RW_OFFSET], [
AC_MSG_CHECKING(
[whether aops->direct_IO() uses iov_iter with rw and offset])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
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,
};
],[
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER_RW_OFFSET, 1,
[aops->direct_IO() uses iov_iter with rw and offset])
zfs_ac_direct_io="yes"
],[
AC_MSG_RESULT([no])
])
])
dnl #
dnl # Ancient Linux API (predates git)
dnl #
AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO_IOVEC], [
AC_MSG_CHECKING([whether aops->direct_IO() uses iovec])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
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_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_DIRECT_IO_IOVEC, 1,
[aops->direct_IO() uses iovec])
zfs_ac_direct_io="yes"
],[
AC_MSG_RESULT([no])
])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO], [
zfs_ac_direct_io="no"
if test "$zfs_ac_direct_io" = "no"; then
ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER
fi
if test "$zfs_ac_direct_io" = "no"; then
ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER_OFFSET
fi
if test "$zfs_ac_direct_io" = "no"; then
ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER_RW_OFFSET
fi
if test "$zfs_ac_direct_io" = "no"; then
ZFS_AC_KERNEL_VFS_DIRECT_IO_IOVEC
fi
if test "$zfs_ac_direct_io" = "no"; then
AC_MSG_ERROR([no; unknown direct IO interface])
fi
])
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