nlm_Unshare.c

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/*
 * Copyright IBM Corporation, 2012
 *  Contributor: Frank Filz <ffilz@us.ibm.com>
 *
 * --------------------------
 *
 * 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 <stdio.h>
#include <string.h>
#include <pthread.h>
#include "ganesha_rpc.h"
#include "log.h"
#include "nlm4.h"
#include "sal_functions.h"
#include "nlm_util.h"
#include "nlm_async.h"

int nlm4_Unshare(nfs_arg_t            * parg,
                 exportlist_t         * pexport,
                 fsal_op_context_t    * pcontext,
                 nfs_worker_data_t    * pworker,
                 struct svc_req       * preq,
                 nfs_res_t            * pres)
{
  nlm4_shareargs     * arg = &parg->arg_nlm4_share;
  cache_entry_t      * pentry;
  state_status_t       state_status = STATE_SUCCESS;
  char                 buffer[MAXNETOBJ_SZ * 2];
  state_nsm_client_t * nsm_client;
  state_nlm_client_t * nlm_client;
  state_owner_t      * nlm_owner;
  int                  rc;
  int                  grace = nfs_in_grace();

  pres->res_nlm4share.sequence = 0;

  netobj_to_string(&arg->cookie, buffer, 1024);
  LogDebug(COMPONENT_NLM,
           "REQUEST PROCESSING: Calling nlm4_Unshare cookie=%s reclaim=%s",
           buffer,
           arg->reclaim ? "yes" : "no");

  if(!copy_netobj(&pres->res_nlm4share.cookie, &arg->cookie))
    {
      pres->res_nlm4share.stat = NLM4_FAILED;
      LogDebug(COMPONENT_NLM, "REQUEST RESULT: nlm4_Unshare %s",
               lock_result_str(pres->res_nlm4share.stat));
      return NFS_REQ_OK;
    }

  /* Allow only reclaim share request during recovery and visa versa.
   * Note: NLM_SHARE is indicated to be non-monitored, however, it does
   * have a reclaim flag, so we will honor the reclaim flag if used.
   * This is a little more bizare for UNSHARE, but, we'll still honor
   * the reclaim flag.
   */
  if((grace && !arg->reclaim) ||
     (!grace && arg->reclaim))
    {
      pres->res_nlm4share.stat = NLM4_DENIED_GRACE_PERIOD;
      LogDebug(COMPONENT_NLM, "REQUEST RESULT: nlm4_Unshare %s",
               lock_result_str(pres->res_nlm4share.stat));
      return NFS_REQ_OK;
    }

  rc = nlm_process_share_parms(preq,
                               &arg->share,
                               &pentry,
                               pcontext,
                               CARE_NOT,
                               &nsm_client,
                               &nlm_client,
                               &nlm_owner);

  if(rc >= 0)
    {
      /* Present the error back to the client */
      pres->res_nlm4share.stat = (nlm4_stats)rc;
      LogDebug(COMPONENT_NLM, "REQUEST RESULT: nlm4_Unshare %s",
               lock_result_str(pres->res_nlm4share.stat));
      return NFS_REQ_OK;
    }

  if(state_nlm_unshare(pentry,
                       pcontext,
                       arg->share.access,
                       arg->share.mode,
                       nlm_owner,
                       &state_status) != STATE_SUCCESS)
    {
      pres->res_nlm4share.stat = nlm_convert_state_error(state_status);
    }
  else
    {
      pres->res_nlm4share.stat = NLM4_GRANTED;
    }

  /* Release the NLM Client and NLM Owner references we have */
  dec_nsm_client_ref(nsm_client);
  dec_nlm_client_ref(nlm_client);
  dec_state_owner_ref(nlm_owner);
  cache_inode_put(pentry);

  LogDebug(COMPONENT_NLM, "REQUEST RESULT: nlm4_Unshare %s",
           lock_result_str(pres->res_nlm4share.stat));
  return NFS_REQ_OK;
}

void nlm4_Unshare_Free(nfs_res_t * pres)
{
  netobj_free(&pres->res_nlm4share.cookie);
  return;
}