drbd: add lists to find oldest pending requests
authorLars Ellenberg <lars.ellenberg@linbit.com>
Fri, 22 Nov 2013 11:52:03 +0000 (12:52 +0100)
committerPhilipp Reisner <philipp.reisner@linbit.com>
Thu, 10 Jul 2014 16:35:12 +0000 (18:35 +0200)
Adding requests to per-device fifo lists as soon as possible after
allocating them leaves a simple list_first_entry_or_null() to find the
oldest request, regardless what it is still waiting for.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

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