fsal_truncate.c

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/*
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 * Copyright (C) 2010 The Linux Box, Inc.
 * Contributor : Adam C. Emerson <aemerson@linuxbox.com>
 *
 * Portions 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

#include "fsal.h"
#include "fsal_internal.h"
#include "fsal_convert.h"

fsal_status_t CEPHFSAL_truncate(fsal_handle_t * exthandle,
                                fsal_op_context_t * extcontext,
                                fsal_size_t length,
                                fsal_file_t * file_descriptor,
                                fsal_attrib_list_t * object_attributes)
{
  int rc;
  fsal_status_t status;
  cephfsal_handle_t* handle = (cephfsal_handle_t*) exthandle;
  cephfsal_op_context_t* context = (cephfsal_op_context_t*) extcontext;
  int uid = FSAL_OP_CONTEXT_TO_UID(context);
  int gid = FSAL_OP_CONTEXT_TO_GID(context);

  /* sanity checks.
   * note : object_attributes is optional.
   */
  if(!handle || !context)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_truncate);

  TakeTokenFSCall();
  rc = ceph_ll_truncate(context->export_context->cmount, VINODE(handle),
                        length, uid, gid);
  ReleaseTokenFSCall();

  if (rc < 0)
    Return(posix2fsal_error(rc), 0, INDEX_FSAL_create);

  if(object_attributes)
    {
      status = CEPHFSAL_getattrs(exthandle, extcontext, object_attributes);

      if(FSAL_IS_ERROR(status))
        {
          FSAL_CLEAR_MASK(object_attributes->asked_attributes);
          FSAL_SET_MASK(object_attributes->asked_attributes, FSAL_ATTR_RDATTR_ERR);
        }
    }

  /* No error occured */
  Return(ERR_FSAL_NO_ERROR, 0, INDEX_FSAL_truncate);
}