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fs: dlm: remove filter local comms on close 

The current way how lowcomms is configured is due configfs entries. Each
comms configfs entry will create a lowcomms connection. Even the local
connection itself will be stored as a lowcomms connection, although most
functionality for a local lowcomms connection struct is not necessary.

Now in some scenarios we will see that dlm_controld reports a -EEXIST
when configure a node via configfs:

... /sys/kernel/config/dlm/cluster/comms/1/addr: write failed: 17 -1

Doing a:

cat /sys/kernel/config/dlm/cluster/comms/1/addr_list

reported nothing. This was being seen on cluster with nodeid 1 and it's
local configuration. To be sure the configfs entries are in sync with
lowcomms connection structures we always call dlm_midcomms_close() to be
sure the lowcomms connection gets removed when the configfs entry gets
dropped.

Before commit 07ee38674a ("fs: dlm: filter ourself midcomms calls") it
was just doing this by accident and the filter by doing:

if (nodeid == dlm_our_nodeid())
	return 0;

inside dlm_midcomms_close() was never been hit because drop_comm() sets
local_comm to NULL and cause that dlm_our_nodeid() returns always the
invalid nodeid 0.

Fixes: 07ee38674a ("fs: dlm: filter ourself midcomms calls")
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2023-06-20 10:15:57 -04:00 committed by David Teigland
parent 1696c75f18
commit fc4ea4229c
1 changed files with 1 additions and 2 deletions
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3
fs/dlm/config.c
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@ -532,8 +532,7 @@ static void drop_comm(struct config_group *g, struct config_item *i)
struct dlm_comm *cm = config_item_to_comm(i);
if (local_comm == cm)
local_comm = NULL;
if (!cm->local)
dlm_midcomms_close(cm->nodeid);
dlm_midcomms_close(cm->nodeid);
while (cm->addr_count--)
kfree(cm->addr[cm->addr_count]);
config_item_put(i);