FAILED: patch "[PATCH] smb3: do not try to cache root directory if dir leases not" failed to apply to 5.4-stable tree

FAILED: patch "[PATCH] smb3: do not try to cache root directory if dir leases not" failed to apply to 5.4-stable tree

[gregkh]

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 3c6e65e679182d55779ef6f8582f0945af4319b0 Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@microsoft.com>
Date: Wed, 21 Oct 2020 00:15:42 -0500
Subject: [PATCH] smb3: do not try to cache root directory if dir leases not
 supported

To servers which do not support directory leases (e.g. Samba)
it is wasteful to try to open_shroot (ie attempt to cache the
root directory handle).  Skip attempt to open_shroot when
server does not indicate support for directory leases.

Cuts the number of requests on mount from 17 to 15, and
cuts the number of requests on stat of the root directory
from 4 to 3.

Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org> # v5.1+

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index d096cfda56eb..3a9980bf0d6e 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3608,7 +3608,10 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
 	 */
 	tcon->retry = volume_info->retry;
 	tcon->nocase = volume_info->nocase;
-	tcon->nohandlecache = volume_info->nohandlecache;
+	if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)
+		tcon->nohandlecache = volume_info->nohandlecache;
+	else
+		tcon->nohandlecache = 1;
 	tcon->nodelete = volume_info->nodelete;
 	tcon->local_lease = volume_info->local_lease;
 	INIT_LIST_HEAD(&tcon->pending_opens);