MD_FAILFAST_SUPPORTED
if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
(1L << MD_FAILFAST_SUPPORTED) |\
set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags);
set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags);
((1L << MD_FAILFAST_SUPPORTED) | \