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authorDavid Teigland <teigland@redhat.com>2012-03-30 20:46:08 +0400
committerDavid Teigland <teigland@redhat.com>2012-04-27 00:35:38 +0400
commit513ef596d43cc35a72ae21170075136855641493 (patch)
tree89a73567803e4cdc910849af388a934923625345 /fs/dlm/lowcomms.c
parentaf3a3ab2966112c0d0a44df7eeb1e95fe32d4495 (diff)
downloadlinux-513ef596d43cc35a72ae21170075136855641493.tar.xz
dlm: prevent connections during shutdown
During lowcomms shutdown, a new connection could possibly be created, and attempt to use a workqueue that's been destroyed. Similarly, during startup, a new connection could attempt to use a workqueue that's not been set up yet. Add a global variable to indicate when new connections are allowed. Based on patch by: Christine Caulfield <ccaulfie@redhat.com> Reported-by: dann frazier <dann.frazier@canonical.com> Reviewed-by: dann frazier <dann.frazier@canonical.com> Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm/lowcomms.c')
-rw-r--r--fs/dlm/lowcomms.c28
1 files changed, 20 insertions, 8 deletions
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 133ef6dc7cb7..5c1b0e38c7a4 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -142,6 +142,7 @@ struct writequeue_entry {
static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT];
static int dlm_local_count;
+static int dlm_allow_conn;
/* Work queues */
static struct workqueue_struct *recv_workqueue;
@@ -710,6 +711,13 @@ static int tcp_accept_from_sock(struct connection *con)
struct connection *newcon;
struct connection *addcon;
+ mutex_lock(&connections_lock);
+ if (!dlm_allow_conn) {
+ mutex_unlock(&connections_lock);
+ return -1;
+ }
+ mutex_unlock(&connections_lock);
+
memset(&peeraddr, 0, sizeof(peeraddr));
result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM,
IPPROTO_TCP, &newsock);
@@ -1503,6 +1511,7 @@ void dlm_lowcomms_stop(void)
socket activity.
*/
mutex_lock(&connections_lock);
+ dlm_allow_conn = 0;
foreach_conn(stop_conn);
mutex_unlock(&connections_lock);
@@ -1530,7 +1539,7 @@ int dlm_lowcomms_start(void)
if (!dlm_local_count) {
error = -ENOTCONN;
log_print("no local IP address has been set");
- goto out;
+ goto fail;
}
error = -ENOMEM;
@@ -1538,7 +1547,13 @@ int dlm_lowcomms_start(void)
__alignof__(struct connection), 0,
NULL);
if (!con_cache)
- goto out;
+ goto fail;
+
+ error = work_start();
+ if (error)
+ goto fail_destroy;
+
+ dlm_allow_conn = 1;
/* Start listening */
if (dlm_config.ci_protocol == 0)
@@ -1548,20 +1563,17 @@ int dlm_lowcomms_start(void)
if (error)
goto fail_unlisten;
- error = work_start();
- if (error)
- goto fail_unlisten;
-
return 0;
fail_unlisten:
+ dlm_allow_conn = 0;
con = nodeid2con(0,0);
if (con) {
close_connection(con, false);
kmem_cache_free(con_cache, con);
}
+fail_destroy:
kmem_cache_destroy(con_cache);
-
-out:
+fail:
return error;
}