LU-6142 lustre: use is_root_inode()

[fs/lustre-release.git] / lustre / autoconf / lustre-core.m4

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index 286f717..7eeefa8 100644 (file)
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -996,6 +996,23 @@ aio_complete, [
 ]) # LC_HAVE_AIO_COMPLETE
 
 #
+# LC_HAVE_IS_ROOT_INODE
+#
+# 3.19 kernel adds is_root_inode()
+# Commit a7400222e3eb ("new helper: is_root_inode()")
+#
+AC_DEFUN([LC_HAVE_IS_ROOT_INODE], [
+LB_CHECK_COMPILE([if kernel has is_root_inode() ],
+is_root_inode, [
+       #include <linux/fs.h>
+],[
+       is_root_inode(NULL);
+],[
+       AC_DEFINE(HAVE_IS_ROOT_INODE, 1, [is_root_inode defined])
+])
+]) # LC_HAVE_IS_ROOT_INODE
+
+#
 # LC_BACKING_DEV_INFO_REMOVAL
 #
 # 3.20 kernel removed backing_dev_info from address_space
@@ -2369,6 +2386,7 @@ AC_DEFUN([LC_PROG_LINUX], [
        LC_KIOCB_HAS_NBYTES
        LC_HAVE_DQUOT_QC_DQBLK
        LC_HAVE_AIO_COMPLETE
+       LC_HAVE_IS_ROOT_INODE
 
        # 3.20
        LC_BACKING_DEV_INFO_REMOVAL