+# LB_JBD2_JOURNAL_GET_MAX_TXN_BUFS
+# Linux commit v5.10-rc2-9-gede7dc7fa0af
+# jbd2: rename j_maxlen to j_total_len and add jbd2_journal_max_txn_bufs
+#
+AC_DEFUN([LB_JBD2_JOURNAL_GET_MAX_TXN_BUFS], [
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_CHECK_COMPILE([if jbd2_journal_get_max_txn_bufs is available],
+jbd2_journal_get_max_txn_bufs, [
+ #include <linux/jbd2.h>
+],[
+ journal_t *journal = NULL;
+ int x = jbd2_journal_get_max_txn_bufs(journal);
+ (void)x;
+],[
+ AC_DEFINE(HAVE_JBD2_JOURNAL_GET_MAX_TXN_BUFS, 1,
+ [if jbd2_journal_get_max_txn_bufs is available])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+]) # LB_JBD2_JOURNAL_GET_MAX_TXN_BUFS
+
+#