Bitmap_sync
test_bit(Bitmap_sync, &rdev->flags))
clear_bit(Bitmap_sync, &rdev->flags);
set_bit(Bitmap_sync, &rdev->flags);
clear_bit(Bitmap_sync, &rdev->flags);
set_bit(Bitmap_sync, &rdev->flags);
clear_bit(Bitmap_sync, &rdev->flags);
clear_bit(Bitmap_sync, &rdev->flags);
if (rdev->saved_raid_disk >= 0 && !test_bit(Bitmap_sync, &rdev->flags))