linux-kernel - [PATCH 5.10 002/243] cifs: handle reconnect of tcon when there is no cached dfs referral

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Date:   Mon, 19 Jul 2021 16:50:31 +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>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 5.10 002/243] cifs: handle reconnect of tcon when there is no cached dfs referral

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

commit 507345b5ae6a57b7ecd7550ff39282ed20de7b8d upstream.

When there is no cached DFS referral of tcon->dfs_path, then reconnect
to same share.

Signed-off-by: Paulo Alcantara (SUSE) <pc@....nz>
Cc: <stable@...r.kernel.org>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/cifs/connect.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -5352,7 +5352,8 @@ int cifs_tree_connect(const unsigned int
 	if (!tree)
 		return -ENOMEM;
 
-	if (!tcon->dfs_path) {
+	/* If it is not dfs or there was no cached dfs referral, then reconnect to same share */
+	if (!tcon->dfs_path || dfs_cache_noreq_find(tcon->dfs_path + 1, &ref, &tl)) {
 		if (tcon->ipc) {
 			scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
 			rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
@@ -5362,9 +5363,6 @@ int cifs_tree_connect(const unsigned int
 		goto out;
 	}
 
-	rc = dfs_cache_noreq_find(tcon->dfs_path + 1, &ref, &tl);
-	if (rc)
-		goto out;
 	isroot = ref.server_type == DFS_TYPE_ROOT;
 	free_dfs_info_param(&ref);