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| author | Jon Paul Maloy <jon.maloy@ericsson.com> | 2015-02-03 08:59:18 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-02-04 16:09:31 -0800 |
| commit | 7d24dcdb3f3132e0ec36f19c49bd004bc874b8aa (patch) | |
| tree | e42789818fc429ba6709f98732c7f6a31d5013b3 /net/tipc | |
| parent | 2d72d49553d8de113d4eb1f69b2291f449a4c6bc (diff) | |
| download | linux-7d24dcdb3f3132e0ec36f19c49bd004bc874b8aa.tar.gz linux-7d24dcdb3f3132e0ec36f19c49bd004bc874b8aa.tar.bz2 linux-7d24dcdb3f3132e0ec36f19c49bd004bc874b8aa.zip | |
tipc: avoid stale link after aborted failover
During link failover it may happen that the remaining link goes
down while it is still in the process of taking over traffic
from a previously failed link. When this happens, we currently
abort the failover procedure and reset the first failed link to
non-failover mode, so that it will be ready to re-establish
contact with its peer when it comes available.
However, if the first link goes down because its bearer was manually
disabled, it is not enough to reset it; it must also be deleted;
which is supposed to happen when the failover procedure is finished.
Otherwise it will remain a zombie link: attached to the owner node
structure, in mode LINK_STOPPED, and permanently blocking any re-
establishing of the link to the peer via the interface in question.
We fix this by amending the failover abort procedure. Apart from
resetting the link to non-failover state, we test if the link is
also in LINK_STOPPED mode. If so, we delete it, using the conditional
tipc_link_delete() function introduced in the previous commit.
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc')
| -rw-r--r-- | net/tipc/link.h | 1 | ||||
| -rw-r--r-- | net/tipc/node.c | 4 |
2 files changed, 5 insertions, 0 deletions
diff --git a/net/tipc/link.h b/net/tipc/link.h index f06b779c9f75..3e3432b3044e 100644 --- a/net/tipc/link.h +++ b/net/tipc/link.h @@ -202,6 +202,7 @@ struct tipc_port; struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, struct tipc_bearer *b_ptr, const struct tipc_media_addr *media_addr); +void tipc_link_delete(struct tipc_link *link); void tipc_link_delete_list(struct net *net, unsigned int bearer_id, bool shutting_down); void tipc_link_failover_send_queue(struct tipc_link *l_ptr); diff --git a/net/tipc/node.c b/net/tipc/node.c index ee5d33cfcf80..d4cb8c127063 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -406,6 +406,10 @@ static void node_lost_contact(struct tipc_node *n_ptr) l_ptr->reset_checkpoint = l_ptr->next_in_no; l_ptr->exp_msg_count = 0; tipc_link_reset_fragments(l_ptr); + + /* Link marked for deletion after failover? => do it now */ + if (l_ptr->flags & LINK_STOPPED) + tipc_link_delete(l_ptr); } n_ptr->action_flags &= ~TIPC_WAIT_OWN_LINKS_DOWN; |