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dnl #
dnl # Check for available iov_iter functionality.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_IOV_ITER], [
ZFS_LINUX_TEST_SRC([iov_iter_types], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
int type __attribute__ ((unused)) = ITER_KVEC;
])
ZFS_LINUX_TEST_SRC([iov_iter_advance], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
size_t advance = 512;
iov_iter_advance(&iter, advance);
])
ZFS_LINUX_TEST_SRC([iov_iter_revert], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
size_t revert = 512;
iov_iter_revert(&iter, revert);
])
ZFS_LINUX_TEST_SRC([iov_iter_fault_in_readable], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
size_t size = 512;
int error __attribute__ ((unused));
error = iov_iter_fault_in_readable(&iter, size);
])
ZFS_LINUX_TEST_SRC([fault_in_iov_iter_readable], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
size_t size = 512;
int error __attribute__ ((unused));
error = fault_in_iov_iter_readable(&iter, size);
])
ZFS_LINUX_TEST_SRC([iov_iter_count], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
size_t bytes __attribute__ ((unused));
bytes = iov_iter_count(&iter);
])
ZFS_LINUX_TEST_SRC([copy_to_iter], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
char buf[512] = { 0 };
size_t size = 512;
size_t bytes __attribute__ ((unused));
bytes = copy_to_iter((const void *)&buf, size, &iter);
])
ZFS_LINUX_TEST_SRC([copy_from_iter], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
char buf[512] = { 0 };
size_t size = 512;
size_t bytes __attribute__ ((unused));
bytes = copy_from_iter((void *)&buf, size, &iter);
])
ZFS_LINUX_TEST_SRC([iov_iter_type], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
__attribute__((unused)) enum iter_type i = iov_iter_type(&iter);
])
ZFS_LINUX_TEST_SRC([iter_iov], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
__attribute__((unused)) const struct iovec *iov = iter_iov(&iter);
])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_IOV_ITER], [
enable_vfs_iov_iter="yes"
AC_MSG_CHECKING([whether iov_iter types are available])
ZFS_LINUX_TEST_RESULT([iov_iter_types], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_TYPES, 1,
[iov_iter types are available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
AC_MSG_CHECKING([whether iov_iter_advance() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_advance], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_ADVANCE, 1,
[iov_iter_advance() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
AC_MSG_CHECKING([whether iov_iter_revert() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_revert], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_REVERT, 1,
[iov_iter_revert() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
AC_MSG_CHECKING([whether iov_iter_fault_in_readable() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_fault_in_readable], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_FAULT_IN_READABLE, 1,
[iov_iter_fault_in_readable() is available])
],[
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether fault_in_iov_iter_readable() is available])
ZFS_LINUX_TEST_RESULT([fault_in_iov_iter_readable], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FAULT_IN_IOV_ITER_READABLE, 1,
[fault_in_iov_iter_readable() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
])
AC_MSG_CHECKING([whether iov_iter_count() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_count], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_COUNT, 1,
[iov_iter_count() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
AC_MSG_CHECKING([whether copy_to_iter() is available])
ZFS_LINUX_TEST_RESULT([copy_to_iter], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_COPY_TO_ITER, 1,
[copy_to_iter() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
AC_MSG_CHECKING([whether copy_from_iter() is available])
ZFS_LINUX_TEST_RESULT([copy_from_iter], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_COPY_FROM_ITER, 1,
[copy_from_iter() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
dnl #
dnl # This checks for iov_iter_type() in linux/uio.h. It is not
dnl # required, however, and the module will compiled without it
dnl # using direct access of the member attribute
dnl #
AC_MSG_CHECKING([whether iov_iter_type() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_type], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_TYPE, 1,
[iov_iter_type() is available])
],[
AC_MSG_RESULT(no)
])
dnl #
dnl # As of the 4.9 kernel support is provided for iovecs, kvecs,
dnl # bvecs and pipes in the iov_iter structure. As long as the
dnl # other support interfaces are all available the iov_iter can
dnl # be correctly used in the uio structure.
dnl #
AS_IF([test "x$enable_vfs_iov_iter" = "xyes"], [
AC_DEFINE(HAVE_VFS_IOV_ITER, 1,
[All required iov_iter interfaces are available])
])
dnl #
dnl # Kernel 6.5 introduces the iter_iov() function that returns the
dnl # __iov member of an iov_iter*. The iov member was renamed to this
dnl # __iov member, and is intended to be accessed via the helper
dnl # function now.
dnl #
AC_MSG_CHECKING([whether iter_iov() is available])
ZFS_LINUX_TEST_RESULT([iter_iov], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ITER_IOV, 1,
[iter_iov() is available])
],[
AC_MSG_RESULT(no)
])
])
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