cifs: Fix negotiate retry functionality

SMB negotiate retry functionality in cifs_negotiate() is currently broken
and does not work when doing socket reconnect. Caller of this function,
which is cifs_negotiate_protocol() requires that tcpStatus after successful
execution of negotiate callback stay in CifsInNegotiate. But if the
CIFSSMBNegotiate() called from cifs_negotiate() fails due to connection
issues then tcpStatus is changed as so repeated CIFSSMBNegotiate() call
does not help.

Fix this problem by moving retrying code from negotiate callback (which is
either cifs_negotiate() or smb2_negotiate()) to cifs_negotiate_protocol()
which is caller of those callbacks. This allows to properly handle and
implement correct transistions between tcpStatus states as function
cifs_negotiate_protocol() already handles it.

With this change, cifs_negotiate_protocol() now handles also -EAGAIN error
set by the RFC1002_NEGATIVE_SESSION_RESPONSE processing after reconnecting
with NetBIOS session.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: pali

fs/smb/client/connect.c

@@ -4202,11 +4202,13 @@ int
 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
 			struct TCP_Server_Info *server)
 {
+	bool in_retry = false;
 	int rc = 0;
 
 	if (!server->ops->need_neg || !server->ops->negotiate)
 		return -ENOSYS;
 
+retry:
 	/* only send once per connect */
 	spin_lock(&server->srv_lock);
 	if (server->tcpStatus != CifsGood &&
@@ -4226,6 +4228,14 @@ cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
 	spin_unlock(&server->srv_lock);
 
 	rc = server->ops->negotiate(xid, ses, server);
+	if (rc == -EAGAIN) {
+		/* Allow one retry attempt */
+		if (!in_retry) {
+			in_retry = true;
+			goto retry;
+		}
+		rc = -EHOSTDOWN;
+	}
 	if (rc == 0) {
 		spin_lock(&server->srv_lock);
 		if (server->tcpStatus == CifsInNegotiate)

fs/smb/client/smb1ops.c

@@ -426,13 +426,6 @@ cifs_negotiate(const unsigned int xid,
 {
 	int rc;
 	rc = CIFSSMBNegotiate(xid, ses, server);
-	if (rc == -EAGAIN) {
-		/* retry only once on 1st time connection */
-		set_credits(server, 1);
-		rc = CIFSSMBNegotiate(xid, ses, server);
-		if (rc == -EAGAIN)
-			rc = -EHOSTDOWN;
-	}
 	return rc;
 }
 

fs/smb/client/smb2ops.c

@@ -464,9 +464,6 @@ smb2_negotiate(const unsigned int xid,
 	server->CurrentMid = 0;
 	spin_unlock(&server->mid_lock);
 	rc = SMB2_negotiate(xid, ses, server);
-	/* BB we probably don't need to retry with modern servers */
-	if (rc == -EAGAIN)
-		rc = -EHOSTDOWN;
 	return rc;
 }