+AC_DEFUN(LINUX_FS_STRUCT_INODE_HAS_I_DIRTY_DATA_BUFFERS, [
+AC_MSG_CHECKING(for i_dirty_data_buffers in struct inode)
+save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="-I${LINUX_KERNEL_PATH}/include -D__KERNEL__ $CPPFLAGS"
+AC_CACHE_VAL(ac_cv_linux_fs_struct_inode_has_i_dirty_data_buffers,
+[
+AC_TRY_COMPILE(
+[#include <linux/fs.h>],
+[struct inode _inode;
+printf("%d\n", _inode.i_dirty_data_buffers);],
+ac_cv_linux_fs_struct_inode_has_i_dirty_data_buffers=yes,
+ac_cv_linux_fs_struct_inode_has_i_dirty_data_buffers=no)])
+AC_MSG_RESULT($ac_cv_linux_fs_struct_inode_has_i_dirty_data_buffers)
+CPPFLAGS="$save_CPPFLAGS"])
+
+AC_DEFUN(LINUX_FS_STRUCT_INODE_HAS_I_MAPPING_OVERLOAD, [
+AC_MSG_CHECKING(for i_mapping_overload in struct inode)
+save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="-I${LINUX_KERNEL_PATH}/include -D__KERNEL__ $CPPFLAGS"
+AC_CACHE_VAL(ac_cv_linux_fs_struct_inode_has_i_mapping_overload,
+[
+AC_TRY_COMPILE(
+[#include <linux/fs.h>],
+[struct inode _inode;
+printf("%d\n", _inode.i_mapping_overload);],
+ac_cv_linux_fs_struct_inode_has_i_mapping_overload=yes,
+ac_cv_linux_fs_struct_inode_has_i_mapping_overload=no)])
+AC_MSG_RESULT($ac_cv_linux_fs_struct_inode_has_i_mapping_overload)
+CPPFLAGS="$save_CPPFLAGS"])
+
AC_DEFUN(LINUX_FS_STRUCT_INODE_HAS_I_CDEV, [
AC_MSG_CHECKING(for i_cdev in struct inode)
save_CPPFLAGS="$CPPFLAGS"