From 220bb16cbee5b91d0bc0fcc6c71560d631295fa5 Mon Sep 17 00:00:00 2001
From: Evan Klitzke <evan@eklitzke.org>
Date: Thu, 15 Mar 2018 06:54:11 -0700
Subject: [PATCH] util: Introduce DirectoryCommit commit function to sync a
 directory

---
 src/util/system.cpp | 9 +++++++++
 src/util/system.h   | 7 +++++++
 2 files changed, 16 insertions(+)

diff --git a/src/util/system.cpp b/src/util/system.cpp
index 01c588b0d31..43c6ae54ab5 100644
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -1043,6 +1043,15 @@ bool FileCommit(FILE *file)
     return true;
 }
 
+void DirectoryCommit(const fs::path &dirname)
+{
+#ifndef WIN32
+    FILE* file = fsbridge::fopen(dirname, "r");
+    fsync(fileno(file));
+    fclose(file);
+#endif
+}
+
 bool TruncateFile(FILE *file, unsigned int length) {
 #if defined(WIN32)
     return _chsize(_fileno(file), length) == 0;
diff --git a/src/util/system.h b/src/util/system.h
index d2373998dfc..029204f01e6 100644
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -62,6 +62,13 @@ void PrintExceptionContinue(const std::exception *pex, const char* pszThread);
  * feature analogous to fsync().
  */
 bool FileCommit(FILE *file);
+
+/**
+ * Sync directory contents. This is required on some environments to ensure that
+ * newly created files are committed to disk.
+ */
+void DirectoryCommit(const fs::path &dirname);
+
 bool TruncateFile(FILE *file, unsigned int length);
 int RaiseFileDescriptorLimit(int nMinFD);
 void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length);