From: David Teigland <teigland@redhat.com>
Subject: [RHEL5 PATCH] dlm: fix add_requestqueue checking nodes list
Date: Mon, 27 Nov 2006 11:26:33 -0600
Bugzilla: 214475
Message-Id: <20061127172633.GB18093@redhat.com>
Changelog: dlm: fix add_requestqueue checking nodes list


bz 214475

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.


Index: latest/fs/dlm/recoverd.c
===================================================================
--- latest.orig/fs/dlm/recoverd.c
+++ latest/fs/dlm/recoverd.c
@@ -94,14 +94,6 @@ static int ls_recover(struct dlm_ls *ls,
 	}
 
 	/*
-	 * Purge directory-related requests that are saved in requestqueue.
-	 * All dir requests from before recovery are invalid now due to the dir
-	 * rebuild and will be resent by the requesting nodes.
-	 */
-
-	dlm_purge_requestqueue(ls);
-
-	/*
 	 * Wait for all nodes to complete directory rebuild.
 	 */
 
@@ -181,6 +173,14 @@ static int ls_recover(struct dlm_ls *ls,
 
 	dlm_release_root_list(ls);
 
+	/*
+	 * Purge directory-related requests that are saved in requestqueue.
+	 * All dir requests from before recovery are invalid now due to the dir
+	 * rebuild and will be resent by the requesting nodes.
+	 */
+
+	dlm_purge_requestqueue(ls);
+
 	dlm_set_recover_status(ls, DLM_RS_DONE);
 	error = dlm_recover_done_wait(ls);
 	if (error) {
Index: latest/fs/dlm/requestqueue.c
===================================================================
--- latest.orig/fs/dlm/requestqueue.c
+++ latest/fs/dlm/requestqueue.c
@@ -36,9 +36,6 @@ int dlm_add_requestqueue(struct dlm_ls *
 	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 *
 {
 	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;
 
Index: latest/fs/dlm/lockspace.c
===================================================================
--- latest.orig/fs/dlm/lockspace.c
+++ latest/fs/dlm/lockspace.c
@@ -22,6 +22,7 @@
 #include "memory.h"
 #include "lock.h"
 #include "recover.h"
+#include "requestqueue.h"
 
 #ifdef CONFIG_DLM_DEBUG
 int dlm_create_debug_file(struct dlm_ls *ls);
@@ -681,6 +682,7 @@ static int release_lockspace(struct dlm_
 	 * Free structures on any other lists
 	 */
 
+	dlm_purge_requestqueue(ls);
 	kfree(ls->ls_recover_args);
 	dlm_clear_free_entries(ls);
 	dlm_clear_members(ls);