From 21633fc6037f8ceb2bb927dacc3f9ef46ccae891 Mon Sep 17 00:00:00 2001
From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Thu, 16 Apr 2015 14:54:50 +0800
Subject: [PATCH] btrfs: backref: Add special time_seq == (u64)-1 case for
 btrfs_find_all_roots().

Allow btrfs_find_all_roots() to skip all delayed_ref_head lock and tree
lock to do tree search.

This is important for later qgroup implement which will call
find_all_roots() after fs trees are committed.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
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