fsal_access.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

#include "fsal.h"
#include "fsal_internal.h"
#include "fsal_convert.h"
#include "FSAL/access_check.h"

fsal_status_t XFSFSAL_access(fsal_handle_t * p_object_handle,        /* IN */
                             fsal_op_context_t * p_context,  /* IN */
                             fsal_accessflags_t access_type,    /* IN */
                             fsal_attrib_list_t * p_object_attributes   /* [ IN/OUT ] */
    )
{

  fsal_status_t status;

  /* sanity checks.
   * note : object_attributes is optionnal in FSAL_getattrs.
   */
  if(!p_object_handle || !p_context)
    Return(ERR_FSAL_FAULT, 0, INDEX_FSAL_access);

  /* 
   * If an error occures during getattr operation,
   * it is returned, even though the access operation succeeded.
   */

  if(p_object_attributes)
    {

      FSAL_SET_MASK(p_object_attributes->asked_attributes,
                    FSAL_ATTR_OWNER | FSAL_ATTR_GROUP | FSAL_ATTR_ACL | FSAL_ATTR_MODE);
      status = FSAL_getattrs(p_object_handle, p_context, p_object_attributes);

      /* on error, we set a special bit in the mask. */
      if(FSAL_IS_ERROR(status))
        {
          FSAL_CLEAR_MASK(p_object_attributes->asked_attributes);
          FSAL_SET_MASK(p_object_attributes->asked_attributes, FSAL_ATTR_RDATTR_ERR);
          Return(status.major, status.minor, INDEX_FSAL_access);
        }

      status =
          fsal_check_access(p_context, access_type, NULL, p_object_attributes);

    }
  else
    {                           /* p_object_attributes is NULL */
      fsal_attrib_list_t attrs;

      FSAL_CLEAR_MASK(attrs.asked_attributes);
      FSAL_SET_MASK(attrs.asked_attributes,
                    FSAL_ATTR_OWNER | FSAL_ATTR_GROUP | FSAL_ATTR_ACL | FSAL_ATTR_MODE);

      status = FSAL_getattrs(p_object_handle, p_context, &attrs);

      /* on error, we set a special bit in the mask. */
      if(FSAL_IS_ERROR(status))
        Return(status.major, status.minor, INDEX_FSAL_access);

      status = fsal_check_access(p_context, access_type, NULL, &attrs);
    }

  Return(status.major, status.minor, INDEX_FSAL_access);

}