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tipc: avoid stale link after aborted failover

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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>
This commit is contained in:
Jon Paul Maloy 2015-02-03 08:59:18 -05:00 committed by David S. Miller
parent 2d72d49553
commit 7d24dcdb3f
2 changed files with 5 additions and 0 deletions
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1
net/tipc/link.h
View File

@ -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);

4
net/tipc/node.c
View File

@ -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;