From: Shyam Prasad N <sprasad@microsoft.com>
Date: Wed, 30 Mar 2022 09:22:20 +0000
Subject: [PATCH] cifs: do not use tcpStatus after negotiate completes
Git-commit: 1a6a41d4cedd9b302e2200e6f0e3c44dbbe13689
References: bsc#1193629
Patch-mainline: v5.19-rc1

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>
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
---
 fs/cifs/connect.c       | 23 +++++++++++------------
 fs/cifs/smb2pdu.c       |  3 ++-
 fs/cifs/smb2transport.c |  3 ++-
 3 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 1fd8d6a97d7c..da1579fba496 100644
--- a/fs/cifs/connect.c
+++ b/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);
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 1b7ad0c09566..f5321a3500f3 100644
--- a/fs/cifs/smb2pdu.c
+++ b/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);
diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c
index 2af79093b78b..01b732641edb 100644
--- a/fs/cifs/smb2transport.c
+++ b/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;
 	}
-- 
2.36.1


