From ca46963718ef7368c84267c9f5e7394c3890442a Mon Sep 17 00:00:00 2001
From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 1 Nov 2012 07:33:14 +0000
Subject: [PATCH] Btrfs: fix missing flush when committing a transaction

Consider the following case:
	Task1				Task2
	start_transaction
					commit_transaction
					  check pending snapshots list and the
					  list is empty.
	add pending snapshot into list
					  skip the delalloc flush
	end_transaction
					  ...

And then the problem that the snapshot is different with the source subvolume
happen.

This patch fixes the above problem by flush all pending stuffs when all the
other tasks end the transaction.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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