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    Subject[PATCH 5.8 066/633] smb3: do not try to cache root directory if dir leases not supported
    Date
    From: Steve French <stfrench@microsoft.com>

    commit 3c6e65e679182d55779ef6f8582f0945af4319b0 upstream.

    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+
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/cifs/connect.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    --- a/fs/cifs/connect.c
    +++ b/fs/cifs/connect.c
    @@ -3594,7 +3594,10 @@ cifs_get_tcon(struct cifs_ses *ses, stru
    */
    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);

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