btrfs: introduce EXPORT_FOR_TESTS macro
Depending on whether CONFIG_BTRFS_FS_RUN_SANITY_TESTS is set, some BTRFS functions are either local to the file they are implemented in and thus should be declared static or are called from within the test implementation defined in a different file. Introduce an EXPORT_FOR_TESTS macro which depending on CONFIG_BTRFS_FS_RUN_SANITY_TESTS either adds the 'static' keyword to a function or not. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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