From fbb88b87c14953625ba49fdfb4564eec7ae1e787 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Fri, 3 May 2019 06:00:00 -0700
Subject: [PATCH] ircd::db: Advise sequential access for sequential file type.

---
 ircd/db_env.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ircd/db_env.cc b/ircd/db_env.cc
index 3643ca9b1..6bffeabf1 100644
--- a/ircd/db_env.cc
+++ b/ircd/db_env.cc
@@ -8,6 +8,7 @@
 // copyright notice and this permission notice is present in all copies. The
 // full license for this software is available in the LICENSE file.
 
+#include <RB_INC_FCNTL_H
 #include "db.h"
 
 //
@@ -2799,6 +2800,11 @@ try
 		name
 	};
 	#endif
+
+	#if defined(HAVE_POSIX_FADVISE) && defined(POSIX_FADV_SEQUENTIAL)
+	if(!opts.direct)
+		syscall(::posix_fadvise, fd, offset, off_t(0), POSIX_FADV_SEQUENTIAL);
+	#endif
 }
 catch(const std::system_error &e)
 {