smb3: allow disabling requesting leases
In some cases to work around server bugs or performance problems it can be helpful to be able to disable requesting SMB2.1/SMB3 leases on a particular mount (not to all servers and all shares we are mounted to). Add new mount parm "nolease" which turns off requesting leases on directory or file opens. Currently the only way to disable leases is globally through a module load parameter. This is more granular. Suggested-by: NPavel Shilovsky <pshilov@microsoft.com> Signed-off-by: NSteve French <stfrench@microsoft.com> Reviewed-by: NRonnie Sahlberg <lsahlber@redhat.com> Reviewed-by: NPavel Shilovsky <pshilov@microsoft.com> CC: Stable <stable@vger.kernel.org>
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