cifs: set up recurring workqueue job to do SMB echo requests
Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index aa66de1..f38ca08 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -52,6 +52,9 @@
#define CIFS_PORT 445
#define RFC1001_PORT 139
+/* SMB echo "timeout" -- FIXME: tunable? */
+#define SMB_ECHO_INTERVAL (60 * HZ)
+
extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
unsigned char *p24);
@@ -333,6 +336,26 @@
}
+static void
+cifs_echo_request(struct work_struct *work)
+{
+ int rc;
+ struct TCP_Server_Info *server = container_of(work,
+ struct TCP_Server_Info, echo.work);
+
+ /* no need to ping if we got a response recently */
+ if (time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
+ goto requeue_echo;
+
+ rc = CIFSSMBEcho(server);
+ if (rc)
+ cFYI(1, "Unable to send echo request to server: %s",
+ server->hostname);
+
+requeue_echo:
+ queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
+}
+
static int
cifs_demultiplex_thread(struct TCP_Server_Info *server)
{
@@ -1571,6 +1594,8 @@
list_del_init(&server->tcp_ses_list);
spin_unlock(&cifs_tcp_ses_lock);
+ cancel_delayed_work_sync(&server->echo);
+
spin_lock(&GlobalMid_Lock);
server->tcpStatus = CifsExiting;
spin_unlock(&GlobalMid_Lock);
@@ -1662,6 +1687,7 @@
tcp_ses->sequence_number = 0;
INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
+ INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
/*
* at this point we are the only ones with the pointer
@@ -1710,6 +1736,9 @@
cifs_fscache_get_client_cookie(tcp_ses);
+ /* queue echo request delayed work */
+ queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
+
return tcp_ses;
out_err_crypto_release: