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);