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Date: Thu, 11 Jun 2009 10:20:48 -0500
From: David Teigland <teigland@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Christine Caulfield <ccaulfie@...hat.com>
Subject: [PATCH 3/4] dlm: connect to nodes earlier
From: Christine Caulfield <ccaulfie@...hat.com>
Make network connections to other nodes earlier, in the context of
dlm_recoverd. This avoids connecting to nodes from dlm_send where we
try to avoid allocations which could possibly deadlock if memory reclaim
goes into the cluster fs which may try to do a dlm operation.
Signed-off-by: Christine Caulfield <ccaulfie@...hat.com>
Signed-off-by: David Teigland <teigland@...hat.com>
---
fs/dlm/lowcomms.c | 16 +++++++++++++++-
fs/dlm/lowcomms.h | 3 ++-
fs/dlm/member.c | 11 +++++++++--
3 files changed, 26 insertions(+), 4 deletions(-)
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 609108a..2559a97 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -309,6 +309,20 @@ static void lowcomms_state_change(struct sock *sk)
lowcomms_write_space(sk);
}
+int dlm_lowcomms_connect_node(int nodeid)
+{
+ struct connection *con;
+
+ if (nodeid == dlm_our_nodeid())
+ return 0;
+
+ con = nodeid2con(nodeid, GFP_NOFS);
+ if (!con)
+ return -ENOMEM;
+ lowcomms_connect_sock(con);
+ return 0;
+}
+
/* Make a socket active */
static int add_sock(struct socket *sock, struct connection *con)
{
@@ -1421,7 +1435,7 @@ static int work_start(void)
static void stop_conn(struct connection *con)
{
con->flags |= 0x0F;
- if (con->sock)
+ if (con->sock && con->sock->sk)
con->sock->sk->sk_user_data = NULL;
}
diff --git a/fs/dlm/lowcomms.h b/fs/dlm/lowcomms.h
index a9a9618..1311e64 100644
--- a/fs/dlm/lowcomms.h
+++ b/fs/dlm/lowcomms.h
@@ -2,7 +2,7 @@
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
-** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
@@ -19,6 +19,7 @@ void dlm_lowcomms_stop(void);
int dlm_lowcomms_close(int nodeid);
void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc);
void dlm_lowcomms_commit_buffer(void *mh);
+int dlm_lowcomms_connect_node(int nodeid);
#endif /* __LOWCOMMS_DOT_H__ */
diff --git a/fs/dlm/member.c b/fs/dlm/member.c
index 26133f0..2afb770 100644
--- a/fs/dlm/member.c
+++ b/fs/dlm/member.c
@@ -1,7 +1,7 @@
/******************************************************************************
*******************************************************************************
**
-** Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved.
+** Copyright (C) 2005-2009 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
@@ -17,6 +17,7 @@
#include "recover.h"
#include "rcom.h"
#include "config.h"
+#include "lowcomms.h"
static void add_ordered_member(struct dlm_ls *ls, struct dlm_member *new)
{
@@ -45,7 +46,7 @@ static void add_ordered_member(struct dlm_ls *ls, struct dlm_member *new)
static int dlm_add_member(struct dlm_ls *ls, int nodeid)
{
struct dlm_member *memb;
- int w;
+ int w, error;
memb = kzalloc(sizeof(struct dlm_member), GFP_KERNEL);
if (!memb)
@@ -57,6 +58,12 @@ static int dlm_add_member(struct dlm_ls *ls, int nodeid)
return w;
}
+ error = dlm_lowcomms_connect_node(nodeid);
+ if (error < 0) {
+ kfree(memb);
+ return error;
+ }
+
memb->nodeid = nodeid;
memb->weight = w;
add_ordered_member(ls, memb);
--
1.5.5.6
--
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