linux-kernel - [PATCH 5.17 289/343] cifs: force new session setup and tcon for dfs

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Date:   Tue, 12 Apr 2022 08:31:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Paulo Alcantara (SUSE)" <pc@....nz>,
        Enzo Matsumiya <ematsumiya@...e.de>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 5.17 289/343] cifs: force new session setup and tcon for dfs

From: Paulo Alcantara <pc@....nz>

commit fb39d30e227233498c8debe6a9fe3e7cf575c85f upstream.

Do not reuse existing sessions and tcons in DFS failover as it might
connect to different servers and shares.

Signed-off-by: Paulo Alcantara (SUSE) <pc@....nz>
Cc: stable@...r.kernel.org
Reviewed-by: Enzo Matsumiya <ematsumiya@...e.de>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/cifs/connect.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -453,9 +453,7 @@ static int reconnect_target_unlocked(str
 	return rc;
 }
 
-static int
-reconnect_dfs_server(struct TCP_Server_Info *server,
-		     bool mark_smb_session)
+static int reconnect_dfs_server(struct TCP_Server_Info *server)
 {
 	int rc = 0;
 	const char *refpath = server->current_fullpath + 1;
@@ -479,7 +477,12 @@ reconnect_dfs_server(struct TCP_Server_I
 	if (!cifs_tcp_ses_needs_reconnect(server, num_targets))
 		return 0;
 
-	cifs_mark_tcp_ses_conns_for_reconnect(server, mark_smb_session);
+	/*
+	 * Unconditionally mark all sessions & tcons for reconnect as we might be connecting to a
+	 * different server or share during failover.  It could be improved by adding some logic to
+	 * only do that in case it connects to a different server or share, though.
+	 */
+	cifs_mark_tcp_ses_conns_for_reconnect(server, true);
 
 	cifs_abort_connection(server);
 
@@ -537,7 +540,7 @@ int cifs_reconnect(struct TCP_Server_Inf
 	}
 	spin_unlock(&cifs_tcp_ses_lock);
 
-	return reconnect_dfs_server(server, mark_smb_session);
+	return reconnect_dfs_server(server);
 }
 #else
 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)