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drbd: Finished the "on-no-data-accessible suspend-io;" functionality

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When no data is accessible (no connection to the peer, nor a local disk)
allow the user to select to freeze all IO operations instead of getting
IO errors.

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
2010-05-31 10:14:17 +02:00
parent 905cd7d8ac
commit 265be2d098
9 changed files with 90 additions and 1 deletions
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drivers/block/drbd/drbd_req.c
+24
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@@ -226,6 +226,8 @@ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m)
return;
if (s & RQ_LOCAL_PENDING)
return;
if (mdev->state.susp)
return;
if (req->master_bio) {
/* this is data_received (remote read)
@@ -634,6 +636,28 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
/* else: done by handed_over_to_network */
break;
case fail_frozen_disk_io:
if (!(req->rq_state & RQ_LOCAL_COMPLETED))
break;
_req_may_be_done(req, m);
break;
case restart_frozen_disk_io:
if (!(req->rq_state & RQ_LOCAL_COMPLETED))
break;
req->rq_state &= ~RQ_LOCAL_COMPLETED;
rv = MR_READ;
if (bio_data_dir(req->master_bio) == WRITE)
rv = MR_WRITE;
get_ldev(mdev);
req->w.cb = w_restart_disk_io;
drbd_queue_work(&mdev->data.work, &req->w);
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.