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smb3: do not try to cache root directory if dir leases not supported
commit 3c6e65e 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>
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