131 lines
3 KiB
Text
131 lines
3 KiB
Text
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dnl #
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dnl # Linux 4.6.x API change
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER], [
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AC_MSG_CHECKING([whether aops->direct_IO() uses iov_iter])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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ssize_t test_direct_IO(struct kiocb *kiocb,
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struct iov_iter *iter) { return 0; }
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static const struct address_space_operations
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aops __attribute__ ((unused)) = {
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.direct_IO = test_direct_IO,
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};
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],[
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],[
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AC_MSG_RESULT([yes])
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AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER, 1,
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[aops->direct_IO() uses iov_iter without rw])
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zfs_ac_direct_io="yes"
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],[
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AC_MSG_RESULT([no])
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])
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])
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dnl #
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dnl # Linux 4.1.x API change
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER_OFFSET], [
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AC_MSG_CHECKING(
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[whether aops->direct_IO() uses iov_iter with offset])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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ssize_t test_direct_IO(struct kiocb *kiocb,
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struct iov_iter *iter, loff_t offset) { return 0; }
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static const struct address_space_operations
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aops __attribute__ ((unused)) = {
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.direct_IO = test_direct_IO,
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};
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],[
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],[
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AC_MSG_RESULT([yes])
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AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER_OFFSET, 1,
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[aops->direct_IO() uses iov_iter with offset])
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zfs_ac_direct_io="yes"
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],[
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AC_MSG_RESULT([no])
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])
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])
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dnl #
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dnl # Linux 3.16.x API change
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER_RW_OFFSET], [
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AC_MSG_CHECKING(
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[whether aops->direct_IO() uses iov_iter with rw and offset])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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ssize_t test_direct_IO(int rw, struct kiocb *kiocb,
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struct iov_iter *iter, loff_t offset) { return 0; }
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static const struct address_space_operations
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aops __attribute__ ((unused)) = {
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.direct_IO = test_direct_IO,
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};
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],[
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],[
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AC_MSG_RESULT([yes])
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AC_DEFINE(HAVE_VFS_DIRECT_IO_ITER_RW_OFFSET, 1,
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[aops->direct_IO() uses iov_iter with rw and offset])
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zfs_ac_direct_io="yes"
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],[
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AC_MSG_RESULT([no])
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])
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])
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dnl #
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dnl # Ancient Linux API (predates git)
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO_IOVEC], [
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AC_MSG_CHECKING([whether aops->direct_IO() uses iovec])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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ssize_t test_direct_IO(int rw, struct kiocb *kiocb,
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const struct iovec *iov, loff_t offset,
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unsigned long nr_segs) { return 0; }
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static const struct address_space_operations
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aops __attribute__ ((unused)) = {
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.direct_IO = test_direct_IO,
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};
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],[
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],[
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AC_MSG_RESULT([yes])
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AC_DEFINE(HAVE_VFS_DIRECT_IO_IOVEC, 1,
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[aops->direct_IO() uses iovec])
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zfs_ac_direct_io="yes"
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],[
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AC_MSG_RESULT([no])
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])
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])
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AC_DEFUN([ZFS_AC_KERNEL_VFS_DIRECT_IO], [
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zfs_ac_direct_io="no"
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if test "$zfs_ac_direct_io" = "no"; then
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ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER
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fi
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if test "$zfs_ac_direct_io" = "no"; then
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ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER_OFFSET
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fi
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if test "$zfs_ac_direct_io" = "no"; then
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ZFS_AC_KERNEL_VFS_DIRECT_IO_ITER_RW_OFFSET
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fi
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if test "$zfs_ac_direct_io" = "no"; then
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ZFS_AC_KERNEL_VFS_DIRECT_IO_IOVEC
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fi
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if test "$zfs_ac_direct_io" = "no"; then
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AC_MSG_ERROR([no; unknown direct IO interface])
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fi
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])
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