+# 3.14 bring truncate_inode_pages_final for evict_inode
+#
+AC_DEFUN([LC_HAVE_TRUNCATE_IPAGES_FINAL], [
+LB_CHECK_COMPILE([if Linux kernel has truncate_inode_pages_final],
+truncate_ipages_final, [
+ #include <linux/mm.h>
+],[
+ truncate_inode_pages_final(NULL);
+], [
+ AC_DEFINE(HAVE_TRUNCATE_INODE_PAGES_FINAL, 1,
+ [kernel has truncate_inode_pages_final])
+])
+]) # LC_HAVE_TRUNCATE_IPAGES_FINAL
+
+#
+# LC_VFS_RENAME_6ARGS
+#
+# 3.15 has vfs_rename with 6 args
+#
+AC_DEFUN([LC_VFS_RENAME_6ARGS], [
+LB_CHECK_COMPILE([if Linux kernel has 'vfs_rename' with 6 args],
+vfs_rename_6args, [
+ #include <linux/fs.h>
+],[
+ vfs_rename(NULL, NULL, NULL, NULL, NULL, NULL);
+], [
+ AC_DEFINE(HAVE_VFS_RENAME_6ARGS, 1,
+ [kernel has vfs_rename with 6 args])
+])
+]) # LC_VFS_RENAME_6ARGS
+
+#
+# LC_DIRECTIO_USE_ITER
+#
+# 3.16 kernel changes direct IO to use iov_iter
+#
+AC_DEFUN([LC_DIRECTIO_USE_ITER], [
+LB_CHECK_COMPILE([if direct IO uses iov_iter],
+direct_io_iter, [
+ #include <linux/fs.h>
+],[
+ struct address_space_operations ops;
+ struct iov_iter *iter = NULL;
+ loff_t offset = 0;
+
+ ops.direct_IO(0, NULL, iter, offset);
+],[
+ AC_DEFINE(HAVE_DIRECTIO_ITER, 1,
+ [direct IO uses iov_iter])
+])
+]) # LC_DIRECTIO_USE_ITER
+
+#
+# LC_NFS_FILLDIR_USE_CTX
+#
+# 3.18 kernel moved from void cookie to struct dir_context
+#
+AC_DEFUN([LC_NFS_FILLDIR_USE_CTX], [
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_CHECK_COMPILE([if filldir_t uses struct dir_context],
+filldir_ctx, [
+ #include <linux/fs.h>
+],[
+ int filldir(struct dir_context *ctx, const char* name,
+ int i, loff_t off, u64 tmp, unsigned temp)
+ {
+ return 0;
+ }
+
+ struct dir_context ctx = {
+ .actor = filldir,
+ };
+
+ ctx.actor(NULL, "test", 0, (loff_t) 0, 0, 0);
+],[
+ AC_DEFINE(HAVE_FILLDIR_USE_CTX, 1,
+ [filldir_t needs struct dir_context as argument])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+]) # LC_NFS_FILLDIR_USE_CTX
+
+#
+# LC_KIOCB_HAS_NBYTES
+#
+# 3.19 kernel removed ki_nbytes from struct kiocb
+#
+AC_DEFUN([LC_KIOCB_HAS_NBYTES], [
+LB_CHECK_COMPILE([if struct kiocb has ki_nbytes field],
+ki_nbytes, [
+ #include <linux/fs.h>
+],[
+ struct kiocb iocb;
+
+ iocb.ki_nbytes = 0;
+],[
+ AC_DEFINE(HAVE_KI_NBYTES, 1, [ki_nbytes field exist])
+])
+]) # LC_KIOCB_HAS_NBYTES
+
+#
+# LC_CANCEL_DIRTY_PAGE
+#
+# 4.0.0 kernel removed cancle_dirty_page
+#
+AC_DEFUN([LC_CANCEL_DIRTY_PAGE], [
+LB_CHECK_COMPILE([if cancel_dirty_page still exist],
+cancel_dirty_page, [
+ #include <linux/mm.h>
+],[
+ cancel_dirty_page(NULL, PAGE_SIZE);
+],[
+ AC_DEFINE(HAVE_CANCEL_DIRTY_PAGE, 1,
+ [cancel_dirty_page is still available])
+])
+]) # LC_CANCEL_DIRTY_PAGE