root/ompi/mca/io/romio321/romio/adio/ad_pvfs2/ad_pvfs2_resize.c

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DEFINITIONS

This source file includes following definitions.
  1. ADIOI_PVFS2_Resize

   1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
   2 /* 
   3  *
   4  *   Copyright (C) 1997 University of Chicago. 
   5  *   See COPYRIGHT notice in top-level directory.
   6  */
   7 
   8 #include "ad_pvfs2.h"
   9 #include "ad_pvfs2_common.h"
  10 
  11 /* as with ADIOI_PVFS2_Flush, implement the resize operation in a scalable
  12  * manner. one process does the work, then broadcasts the result to everyone
  13  * else.  fortunately, this operation is defined to be collective */
  14 void ADIOI_PVFS2_Resize(ADIO_File fd, ADIO_Offset size, int *error_code)
  15 {
  16     int ret, rank;
  17     ADIOI_PVFS2_fs *pvfs_fs;
  18     static char myname[] = "ADIOI_PVFS2_RESIZE";
  19 
  20     *error_code = MPI_SUCCESS;
  21 
  22     pvfs_fs = (ADIOI_PVFS2_fs*)fd->fs_ptr;
  23 
  24     MPI_Comm_rank(fd->comm, &rank);
  25 
  26     /* We desginate one node in the communicator to be an 'io_worker' in 
  27      * ADIO_Open.  This node can perform operations on files and then 
  28      * inform the other nodes of the result */
  29 
  30     /* MPI-IO semantics treat conflicting MPI_File_set_size requests the
  31      * same as conflicting write requests. Thus, a resize from one
  32      * process does not have to be visible to the other processes until a
  33      * syncronization point is reached */
  34 
  35     if (rank == fd->hints->ranklist[0]) {
  36         ret = PVFS_sys_truncate(pvfs_fs->object_ref, 
  37                 size, &(pvfs_fs->credentials));
  38         MPI_Bcast(&ret, 1, MPI_INT, fd->hints->ranklist[0], fd->comm);
  39     } else  {
  40         MPI_Bcast(&ret, 1, MPI_INT, fd->hints->ranklist[0], fd->comm);
  41     }
  42     /* --BEGIN ERROR HANDLING-- */
  43     if (ret != 0) {
  44         *error_code = MPIO_Err_create_code(MPI_SUCCESS,
  45                                            MPIR_ERR_RECOVERABLE,
  46                                            myname, __LINE__,
  47                                            ADIOI_PVFS2_error_convert(ret),
  48                                            "Error in PVFS_sys_truncate", 0);
  49         return;
  50     }
  51     /* --END ERROR HANDLING-- */
  52 }
  53 
  54 /*
  55  * vim: ts=8 sts=4 sw=4 noexpandtab 
  56  */

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