Btrfs: fix wrong search path initialization before searching tree root
To search tree root without transaction protection, we should neither search commit root nor skip locking here, fix it. Signed-off-by: NWang Shilong <wangsl.fnst@cn.fujitsu.com> Signed-off-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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