From 4c486f751bc1e27a7222006fcacae030068800b9 Mon Sep 17 00:00:00 2001
From: Azat Khuzhin <a3at.mail@gmail.com>
Date: Tue, 23 Sep 2014 00:16:49 +0400
Subject: [PATCH] simplefs_write: install h_sync (sync on close) for jbd2
 handle

This will make simplefs journaling more robust.

+ head -n100 /proc/fs/jbd2/loop0/info
7 transactions (7 requested), each up to 640 blocks
average:
  0ms waiting for transaction
  10ms request delay
  26ms running transaction
  0ms transaction was being locked
  0ms flushing data (in ordered mode)
  0ms logging transaction
  3459us average transaction commit time
  1 handles per transaction
  1 blocks per transaction
  2 logged blocks per transaction
---
 simple.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/simple.c b/simple.c
index 42549fc..c2bb5e2 100644
--- a/simple.c
+++ b/simple.c
@@ -415,6 +415,7 @@ ssize_t simplefs_write(struct file * filp, const char __user * buf, size_t len,
 		brelse(bh);
 		return retval;
 	}
+	handle->h_sync = 1;
 	retval = jbd2_journal_stop(handle);
 	if (WARN_ON(retval)) {
 		brelse(bh);