initial code repo

[stor4nfv.git] / src / ceph / src / common / sync_filesystem.h

diff --git a/src/ceph/src/common/sync_filesystem.h b/src/ceph/src/common/sync_filesystem.h
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+++ b/src/ceph/src/common/sync_filesystem.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_SYNC_FILESYSTEM_H
+#define CEPH_SYNC_FILESYSTEM_H
+
+#include <unistd.h>
+
+#if defined(__linux__)
+#include <sys/ioctl.h>
+#include <syscall.h>
+#include "os/fs/btrfs_ioctl.h"
+#endif
+
+inline int sync_filesystem(int fd)
+{
+  /* On Linux, newer versions of glibc have a function called syncfs that
+   * performs a sync on only one filesystem. If we don't have this call, we
+   * have to fall back on sync(), which synchronizes every filesystem on the
+   * computer. */
+#ifdef HAVE_SYS_SYNCFS
+  if (syncfs(fd) == 0)
+    return 0;
+#elif defined(SYS_syncfs)
+  if (syscall(SYS_syncfs, fd) == 0)
+    return 0;
+#elif defined(__NR_syncfs)
+  if (syscall(__NR_syncfs, fd) == 0)
+    return 0;
+#endif
+
+#if defined(HAVE_SYS_SYNCFS) || defined(SYS_syncfs) || defined(__NR_syncfs)
+  else if (errno == ENOSYS) {
+    sync();
+    return 0;
+  } else {
+    return -errno;
+  }
+#else
+  sync();
+  return 0;
+#endif
+}
+
+#endif