Use ext2fs_close2 API if available to avoid unnecessary fsync.

This saves over 5 seconds during the slow path construction of the
appliance.

The ext2fs_close2 API is present in the e2fsprogs 'next' branch and
will be in a later e2fsprogs release (thanks Ted Ts'o).

1 files changed, 9 insertions, 1 deletions

diff --git a/helper/ext2.c b/helper/ext2.c
index 2395871..56ad5e5 100644
--- a/helper/ext2.c
+++ b/helper/ext2.c
@@ -107,8 +107,16 @@ ext2_start (const char *hostcpu, const char *appliance,
 static void
 ext2_end (void)
 {
+  if (verbose)
+    print_timestamped_message ("closing ext2 filesystem");
+
   /* Write out changes and close. */
-  errcode_t err = ext2fs_close (fs);
+  errcode_t err;
+#ifdef HAVE_EXT2FS_CLOSE2
+  err = ext2fs_close2 (fs, EXT2_FLAG_FLUSH_NO_SYNC);
+#else
+  err = ext2fs_close (fs);
+#endif
   if (err != 0)
     error (EXIT_FAILURE, 0, "ext2fs_close: %s", error_message (err));
 }