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 @@ -3595,7 +3595,10 @@ 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);