tree be0835a915143fe9fa63a1c6f2a40dbfdc0c8646
parent 64947ec0d16dd20d6542b58cf82c8d5f9678cabf
author Jan Schmidt <list.btrfs@jan-o-sch.net> 1337180402 +0200
committer Jan Schmidt <list.btrfs@jan-o-sch.net> 1338027474 +0200

Btrfs: dummy extent buffers for tree mod log

The tree modification log needs two ways to create dummy extent buffers,
once by allocating a fresh one (to rebuild an old root) and once by
cloning an existing one (to make private rewind modifications) to it.

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