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H A Dctree.cdiff 8ba97a15e7d4f70b9af71fa1db86a28dd17ad1b2 Mon Jun 04 09:54:57 CDT 2012 Jan Schmidt <list.btrfs@jan-o-sch.net> Btrfs: use btrfs_read_lock_root_node in get_old_root

get_old_root could race with root node updates because we weren't locking
the node early enough. Use btrfs_read_lock_root_node to grab the root locked
in the very beginning and release the lock as soon as possible (just like
btrfs_search_slot does).

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>