[DLM] fix add_requestqueue checking nodes list

Requests that arrive after recovery has started are saved in the
requestqueue and processed after recovery is done.  Some of these requests
are purged during recovery if they are from nodes that have been removed.
We move the purging of the requests (dlm_purge_requestqueue) to later in
the recovery sequence which allows the routine saving requests
(dlm_add_requestqueue) to avoid filtering out requests by nodeid since the
same will be done by the purge.  The current code has add_requestqueue
filtering by nodeid but doesn't hold any locks when accessing the list of
current nodes.  This also means that we need to call the purge routine
when the lockspace is being shut down since the add routine will not be
rejecting requests itself any more.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/fs/dlm/requestqueue.c b/fs/dlm/requestqueue.c
index 0226d2a0a0fa..65008d79c96d 100644
--- a/fs/dlm/requestqueue.c
+++ b/fs/dlm/requestqueue.c
@@ -36,9 +36,6 @@ int dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_header *hd)
         int length = hd->h_length;
         int rv = 0;
 
-        if (dlm_is_removed(ls, nodeid))
-                return 0;
-
         e = kmalloc(sizeof(struct rq_entry) + length, GFP_KERNEL);
         if (!e) {
                 log_print("dlm_add_requestqueue: out of memory\n");
@@ -133,6 +130,10 @@ static int purge_request(struct dlm_ls *ls, struct dlm_message *ms, int nodeid)
 {
         uint32_t type = ms->m_type;
 
+        /* the ls is being cleaned up and freed by release_lockspace */
+        if (!ls->ls_count)
+                return 1;
+
         if (dlm_is_removed(ls, nodeid))
                 return 1;