From 98bd5c547ef2300f915fc1adce5b6f25c195d4d4 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Mon, 19 Jan 2015 14:21:02 +0100
Subject: [PATCH] btrfs: sync ioctl, handle errors after transaction start

The version merged to 3.19 did not handle errors from start_trancaction
and could pass an invalid pointer to commit_transaction.

Fixes: 6b5fe46dfa52441f ("btrfs: do commit in sync_fs if there are pending changes")
Reported-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
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