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"

#include <hpss_errno.h>

fsal_status_t HPSSFSAL_truncate(hpssfsal_handle_t * filehandle, /* IN */
                                hpssfsal_op_context_t * p_context,      /* IN */
                                fsal_size_t length,     /* IN */
                                hpssfsal_file_t * file_descriptor,      /* Unused in this FSAL */
                                fsal_attrib_list_t * object_attributes  /* [ IN/OUT ] */
    )
{

  int rc;
  u_signed64 trunc_size;

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

  /* convert fsal_size_t to u_signed64 */

  trunc_size = fsal2hpss_64(length);

  /* check if it is a file */

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

  /* Executes the HPSS truncate operation */

  TakeTokenFSCall();

  rc = hpss_TruncateHandle(&(filehandle->data.ns_handle),    /* IN - handle of file or parent */
                           NULL,        /* IN (handle addressing) */
                           trunc_size,  /* IN - new file length */
                           &(p_context->credential.hpss_usercred)       /* IN - pointer to user's credentials */
      );

  ReleaseTokenFSCall();

  /* The HPSS_ENOENT error actually means that handle is STALE */
  if(rc == HPSS_ENOENT)
    Return(ERR_FSAL_STALE, -rc, INDEX_FSAL_truncate);
  else if(rc)
    Return(hpss2fsal_error(rc), -rc, INDEX_FSAL_truncate);

  /* Optionnaly retrieve attributes */
  if(object_attributes)
    {

      fsal_status_t st;

      st = HPSSFSAL_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);

}