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 - struct drbd_conf { ... unsigned long flags; ... }
 + struct drbd_conf { ... unsigned long drbd_flags[N]; ... }

And introduce wrapper functions for test/set/clear bit operations
on this member.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>