86f7 Mon Sep 17 00:00:00 2001
From: "Yan, Zheng" <zyan@redhat.com>
Date: Wed, 4 May 2016 11:05:10 +0800
Subject: ceph: keep leaf frag when updating fragtree

Nodes in i_fragtree are sorted according to ceph_compare_frag().
It means frag node in i_fragtree always follow its direct parent
node. To check if a leaf node is valid, we just need to check if
it's child of previous split node.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
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