fsal_truncate.c

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/*
 * vim:expandtab:shiftwidth=8:tabstop=8:
 */

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

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

fsal_status_t FSAL_truncate(fsal_handle_t * filehandle, /* IN */
                            fsal_op_context_t * p_context,      /* IN */
                            fsal_size_t length, /* IN */
                            fsal_file_t * file_descriptor,      /* Unused in this FSAL */
                            fsal_attrib_list_t * object_attributes      /* [ IN/OUT ] */
    )
{

  int rc;

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

  /* >> check object type if it's stored into the filehandle << */

  if(filehandle->object_type_reminder != FSAL_TYPE_FILE)
    {
      Return(ERR_FSAL_INVAL, 0, INDEX_FSAL_truncate);
    }

  TakeTokenFSCall();

  /* >> call your filesystem truncate operation << */

  ReleaseTokenFSCall();

  /* >> interpret error code << */

  /* >> Optionnaly retrieve post op attributes
   * If your filesystem truncate call can't return them,
   * you can proceed like this : <<
   */
  if(object_attributes)
    {

      fsal_status_t st;

      st = FSAL_getattrs(filehandle, p_context, object_attributes);

      if(FSAL_IS_ERROR(st))
        {
          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);

}