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drbd: factored tl_restart() out of tl_clear().

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If IO was frozen for a temporal network outage, resend the
content of the transfer-log into the newly established connection.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner
2010-05-12 17:08:26 +02:00
parent 2a80699f80
commit 11b58e73a3
5 changed files with 103 additions and 40 deletions
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drivers/block/drbd/drbd_req.c
+14
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@@ -634,6 +634,20 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
/* else: done by handed_over_to_network */
break;
case resend:
/* If RQ_NET_OK is already set, we got a P_WRITE_ACK or P_RECV_ACK
before the connection loss; only P_BARRIER_ACK was missing.
Trowing them out of the TL here by pretending we got a BARRIER_ACK
TODO: Either resync them, or ensure peer was not rebooted. */
if (!(req->rq_state & RQ_NET_OK)) {
if (req->w.cb) {
drbd_queue_work(&mdev->data.work, &req->w);
rv = req->rq_state & RQ_WRITE ? MR_WRITE : MR_READ;
}
break;
}
/* else, fall through to barrier_acked */
case barrier_acked:
if (!(req->rq_state & RQ_WRITE))
break;