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These are useful for testing changes to I/O error handling, and for reproducing existing bugs in a controlled manner. The fail points are g_mirror_regular_request_read g_mirror_regular_request_write g_mirror_sync_request_read g_mirror_sync_request_write g_mirror_metadata_write They all effectively allow one to inject an error value into the bio_error field of a corresponding BIO request as it is being completed. MFC after: 2 weeks Sponsored by: EMC / Isilon Storage Division