nfs4_lease.c

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/*
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 * Copyright CEA/DAM/DIF  (2008)
 * contributeur : Philippe DENIEL   philippe.deniel@cea.fr
 *                Thomas LEIBOVICI  thomas.leibovici@cea.fr
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * ---------------------------------------
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef _SOLARIS
#include "solaris_port.h"
#endif

#include "log.h"
#include "nfs_core.h"
#include "nfs4.h"
#include "sal_functions.h"

static unsigned int _valid_lease(nfs_client_id_t * pclientid)
{
  time_t t;

  if(pclientid->cid_confirmed == EXPIRED_CLIENT_ID)
    return 0;

  if(pclientid->cid_lease_reservations != 0)
    return nfs_param.nfsv4_param.lease_lifetime;

  t = time(NULL);

  if(pclientid->cid_last_renew + nfs_param.nfsv4_param.lease_lifetime > t)
    return (pclientid->cid_last_renew + nfs_param.nfsv4_param.lease_lifetime) - t;

  return 0;
}

int valid_lease(nfs_client_id_t * pclientid)
{
  unsigned int valid;

  valid = _valid_lease(pclientid);

  if(isFullDebug(COMPONENT_CLIENTID))
    {
      char str[HASHTABLE_DISPLAY_STRLEN];

      display_client_id_rec(pclientid, str);
      LogFullDebug(COMPONENT_CLIENTID,
                   "Check Lease %s (Valid=%s %u seconds left)",
                   str, valid ? "YES" : "NO", valid);
    }

  return valid != 0;
}

int reserve_lease(nfs_client_id_t * pclientid)
{
  unsigned int valid;

  valid = _valid_lease(pclientid);

  if(valid != 0)
    pclientid->cid_lease_reservations++;

  if(isFullDebug(COMPONENT_CLIENTID))
    {
      char str[HASHTABLE_DISPLAY_STRLEN];

      display_client_id_rec(pclientid, str);
      LogFullDebug(COMPONENT_CLIENTID,
                   "Reserve Lease %s (Valid=%s %u seconds left)",
                   str, valid ? "YES" : "NO", valid);
    }

  return valid != 0;
}

void update_lease(nfs_client_id_t * pclientid)
{
  pclientid->cid_lease_reservations--;

  /* Renew lease when last reservation is released */
  if(pclientid->cid_lease_reservations == 0)
    pclientid->cid_last_renew = time(NULL);

  if(isFullDebug(COMPONENT_CLIENTID))
    {
      char str[HASHTABLE_DISPLAY_STRLEN];

      display_client_id_rec(pclientid, str);
      LogFullDebug(COMPONENT_CLIENTID,
                   "Update Lease %s",
                   str);
    }
}