btrfs: fixup/remove module.h usage as required
We want to avoid module.h where posible, since it in turn includes nearly all of header space. This means removing it where it is not required, and using export.h where we are only exporting symbols via EXPORT_SYMBOL and friends. Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: NChris Mason <chris.mason@fusionio.com>
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