cifs: do not use tcpStatus after negotiate completes

Recent changes to multichannel to allow channel reconnects to
work in parallel and independent of each other did so by
making use of tcpStatus for the connection, and status for the
session. However, this did not take into account the multiuser
scenario, where same connection is used by multiple connections.

However, tcpStatus should be tracked only till the end of
negotiate exchange, and not used for session setup. This change
fixes this.
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/connect.c

@@ -3973,7 +3973,7 @@ cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
 	if (rc == 0) {
 		spin_lock(&cifs_tcp_ses_lock);
 		if (server->tcpStatus == CifsInNegotiate)
-			server->tcpStatus = CifsNeedSessSetup;
+			server->tcpStatus = CifsGood;
 		else
 			rc = -EHOSTDOWN;
 		spin_unlock(&cifs_tcp_ses_lock);
@@ -3996,19 +3996,18 @@ cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
 	bool is_binding = false;
 
 	/* only send once per connect */
+	spin_lock(&ses->chan_lock);
+	is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
+	spin_unlock(&ses->chan_lock);
+
 	spin_lock(&cifs_tcp_ses_lock);
-	if ((server->tcpStatus != CifsNeedSessSetup) &&
-	    (ses->status == CifsGood)) {
+	if (ses->status == CifsExiting) {
 		spin_unlock(&cifs_tcp_ses_lock);
 		return 0;
 	}
-	server->tcpStatus = CifsInSessSetup;
+	ses->status = CifsInSessSetup;
 	spin_unlock(&cifs_tcp_ses_lock);
 
-	spin_lock(&ses->chan_lock);
-	is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
-	spin_unlock(&ses->chan_lock);
-
 	if (!is_binding) {
 		ses->capabilities = server->capabilities;
 		if (!linuxExtEnabled)
@@ -4032,13 +4031,13 @@ cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
 	if (rc) {
 		cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
 		spin_lock(&cifs_tcp_ses_lock);
-		if (server->tcpStatus == CifsInSessSetup)
-			server->tcpStatus = CifsNeedSessSetup;
+		if (ses->status == CifsInSessSetup)
+			ses->status = CifsNeedSessSetup;
 		spin_unlock(&cifs_tcp_ses_lock);
 	} else {
 		spin_lock(&cifs_tcp_ses_lock);
-		if (server->tcpStatus == CifsInSessSetup)
-			server->tcpStatus = CifsGood;
+		if (ses->status == CifsInSessSetup)
+			ses->status = CifsGood;
 		/* Even if one channel is active, session is in good state */
 		ses->status = CifsGood;
 		spin_unlock(&cifs_tcp_ses_lock);

fs/cifs/smb2pdu.c

@@ -3899,7 +3899,8 @@ SMB2_echo(struct TCP_Server_Info *server)
 	cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
 
 	spin_lock(&cifs_tcp_ses_lock);
-	if (server->tcpStatus == CifsNeedNegotiate) {
+	if (server->ops->need_neg &&
+	    server->ops->need_neg(server)) {
 		spin_unlock(&cifs_tcp_ses_lock);
 		/* No need to send echo on newly established connections */
 		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);

fs/cifs/smb2transport.c

@@ -641,7 +641,8 @@ smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 	if (!is_signed)
 		return 0;
 	spin_lock(&cifs_tcp_ses_lock);
-	if (server->tcpStatus == CifsNeedNegotiate) {
+	if (server->ops->need_neg &&
+	    server->ops->need_neg(server)) {
 		spin_unlock(&cifs_tcp_ses_lock);
 		return 0;
 	}