drbd: base completion and destruction of requests on ref counts

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cherry-picked and adapted from drbd 9 devel branch

The logic for when to get or put a reference is in mod_rq_state().

To not get confused in the freeze/thaw respectively resend/restart
paths, or when cleaning up requests waiting for P_BARRIER_ACK, this
also introduces additional state flags:
RQ_COMPLETION_SUSP, and RQ_EXP_BARR_ACK.

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

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This commit is contained in:

Lars Ellenberg

2012-01-24 17:19:42 +01:00

committed by Philipp Reisner

parent b406777e64

commit a0d856dfae

4 changed files with 284 additions and 262 deletions

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drivers/block/drbd/drbd_req.c

+272 -260

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