drbd: better separate WRITE and READ code paths in drbd_make_request
cherry-picked and adapted from drbd 9 devel branch READs will be interesting to at most one connection, WRITEs should be interesting for all established connections. Introduce some helper functions to hopefully make this easier to follow. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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