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>

...

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 277 additions and 255 deletions

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3

drivers/block/drbd/drbd_int.h

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2

drivers/block/drbd/drbd_main.c

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532

drivers/block/drbd/drbd_req.c

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9

drivers/block/drbd/drbd_req.h

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