From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Thu, 16 Apr 2015 06:54:50 +0000 (+0800)
Subject: btrfs: backref: Add special time_seq == (u64)-1 case for
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~69^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=21633fc6037f8ceb2bb927dacc3f9ef46ccae891;p=pandora-kernel.git

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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