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drbd: __req_mod: make DISCARD_WRITE and independend case 

cherry-picked and adapted from drbd 9 devel branch

This looks cleaner to me,
and also gets rid of the other ugly if-inside-case-fall-through.

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 2012-07-24 09:31:18 +02:00 committed by Philipp Reisner
parent a0d856dfae
commit 934722a2db
1 changed files with 11 additions and 5 deletions
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16
drivers/block/drbd/drbd_req.c
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@ -609,13 +609,19 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
case DISCARD_WRITE:
/* for discarded conflicting writes of multiple primaries,
* there is no need to keep anything in the tl, potential
* node crashes are covered by the activity log. */
mod_rq_state(req, NULL, 0, RQ_NET_DONE);
/* fall through */
* node crashes are covered by the activity log.
*
* If this request had been marked as RQ_POSTPONED before,
* it will actually not be discarded, but "restarted",
* resubmitted from the retry worker context. */
D_ASSERT(req->rq_state & RQ_NET_PENDING);
D_ASSERT(req->rq_state & RQ_EXP_WRITE_ACK);
mod_rq_state(req, m, RQ_NET_PENDING, RQ_NET_DONE|RQ_NET_OK);
break;
case WRITE_ACKED_BY_PEER_AND_SIS:
req->rq_state |= RQ_NET_SIS;
case WRITE_ACKED_BY_PEER:
if (what == WRITE_ACKED_BY_PEER_AND_SIS)
req->rq_state |= RQ_NET_SIS;
D_ASSERT(req->rq_state & RQ_EXP_WRITE_ACK);
/* protocol C; successfully written on peer.
* Nothing more to do here.