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 "namespace.h"

fsal_status_t FUSEFSAL_truncate(fsal_handle_t *handle, /* 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;
  char object_path[FSAL_MAX_PATH_LEN];
  fusefsal_handle_t * filehandle = (fusefsal_handle_t *)handle;

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

  if(!p_fs_ops->truncate)
    Return(ERR_FSAL_NOTSUPP, 0, INDEX_FSAL_truncate);

  /* get the full path for the object */
  rc = NamespacePath(filehandle->data.inode, filehandle->data.device, filehandle->data.validator,
                     object_path);
  if(rc)
    Return(ERR_FSAL_STALE, rc, INDEX_FSAL_truncate);

  /* set context for the next operation, so it can be retrieved by FS thread */
  fsal_set_thread_context(p_context);

  TakeTokenFSCall();
  rc = p_fs_ops->truncate(object_path, (off_t) length);
  ReleaseTokenFSCall();

  if(rc)
    Return(fuse2fsal_error(rc, TRUE), rc, INDEX_FSAL_truncate);

  if(object_attributes)
    {

      fsal_status_t st;

      st = FUSEFSAL_getattrs(handle, 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);

}