MS-CIFS says:
"The server MUST NOT disconnect clients that have been inactive less
than 5 minutes."
Using that guideline, perform a reconnect to any server that hasn't
responded in the last 5 minutes. Eventually, we may want to make this
tunable, but it seems like a reasonable default.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/cifs/connect.c | 21 +++++++++++++++++----
1 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 9c90f1d..ece7275 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -55,6 +55,9 @@
/* SMB echo every 60s -- FIXME: tunable? */
#define SMB_ECHO_INTERVAL (60 * HZ)
+/* reconnect if no response from server in this time period */
+#define UNRESPONSIVE_SERVER_TIMEOUT (5 * 60 * HZ)
+
extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
unsigned char *p24);
@@ -183,6 +186,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
kfree(server->session_key.response);
server->session_key.response = NULL;
server->session_key.len = 0;
+ server->lstrp = jiffies;
INIT_LIST_HEAD(&dispose);
spin_lock(&GlobalMid_Lock);
@@ -436,6 +440,16 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
smb_msg.msg_control = NULL;
smb_msg.msg_controllen = 0;
pdu_length = 4; /* enough to get RFC1001 header */
+
+ if (time_after(jiffies,
+ server->lstrp + UNRESPONSIVE_SERVER_TIMEOUT)) {
+ cFYI(1, "Reconnecting unresponsive server %s",
+ server->hostname);
+ cifs_reconnect(server);
+ csocket = server->ssocket;
+ wake_up(&server->response_q);
+ continue;
+ }
incomplete_rcv:
length =
kernel_recvmsg(csocket, &smb_msg,
@@ -597,6 +611,8 @@ incomplete_rcv:
}
mid_entry = NULL;
+ server->lstrp = jiffies;
+
spin_lock(&GlobalMid_Lock);
list_for_each(tmp, &server->pending_mid_q) {
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
@@ -647,10 +663,6 @@ multi_t2_fnd:
#ifdef CONFIG_CIFS_STATS2
mid_entry->when_received = jiffies;
#endif
- /* so we do not time out requests to server
- which is still responding (since server could
- be busy but not dead) */
- server->lstrp = jiffies;
break;
}
next_mid:
@@ -1704,6 +1716,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
tcp_ses->session_estab = false;
tcp_ses->sequence_number = 0;
+ tcp_ses->lstrp = jiffies;
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);
--
1.7.3.2
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