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由 Josef Bacik 提交于
I need to add infrastructure to allocate dummy extent buffers for running sanity tests, and to do this I need to not have to worry about having an address_mapping for an io_tree, so just fix up the places where we assume that all io_tree's have a non-NULL ->mapping. Thanks, Signed-off-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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