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authorLars Ellenberg <lars.ellenberg@linbit.com>2013-03-27 14:08:41 +0100
committerJens Axboe <axboe@kernel.dk>2013-03-28 10:10:25 -0600
commit7074e4a745799d521b17775f6d076d84dc7f8c50 (patch)
treea45461e71c8aaab46b8322fbaeb55e6d8710d057 /drivers/block/drbd/drbd_req.c
parent2bd5ed5d6713594eb2b4d234d01217d506279c7d (diff)
downloadvexpress-lsk-7074e4a745799d521b17775f6d076d84dc7f8c50.tar.gz
drbd: only fail empty flushes if no good data is reachable
We completed empty flushes (blkdev_issue_flush()) with IO error if we lost the local disk, even if we still have an established replication link to a healthy remote disk. Fix this to only report errors to upper layers, if neither local nor remote data is reachable. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/drbd/drbd_req.c')
-rw-r--r--drivers/block/drbd/drbd_req.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 9f7ff1cb46f..beefe65764f 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -263,8 +263,7 @@ void drbd_req_complete(struct drbd_request *req, struct bio_and_error *m)
else
root = &mdev->read_requests;
drbd_remove_request_interval(root, req);
- } else if (!(s & RQ_POSTPONED))
- D_ASSERT((s & (RQ_NET_MASK & ~RQ_NET_DONE)) == 0);
+ }
/* Before we can signal completion to the upper layers,
* we may need to close the current transfer log epoch.
@@ -755,6 +754,11 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
D_ASSERT(req->rq_state & RQ_NET_PENDING);
mod_rq_state(req, m, RQ_NET_PENDING, RQ_NET_OK|RQ_NET_DONE);
break;
+
+ case QUEUE_AS_DRBD_BARRIER:
+ start_new_tl_epoch(mdev->tconn);
+ mod_rq_state(req, m, 0, RQ_NET_OK|RQ_NET_DONE);
+ break;
};
return rv;
@@ -975,8 +979,8 @@ static int drbd_process_write_request(struct drbd_request *req)
/* The only size==0 bios we expect are empty flushes. */
D_ASSERT(req->master_bio->bi_rw & REQ_FLUSH);
if (remote)
- start_new_tl_epoch(mdev->tconn);
- return 0;
+ _req_mod(req, QUEUE_AS_DRBD_BARRIER);
+ return remote;
}
if (!remote && !send_oos)