/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2017 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2008-2018 University of Houston. All rights reserved.
 * Copyright (c) 2018      Research Organization for Information Science
 *                         and Technology (RIST). All rights reserved.
 * Copyright (c) 2018      DataDirect Networks. All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 *
 * These symbols are in a file by themselves to provide nice linker
 * semantics. Since linkers generally pull in symbols by object fules,
 * keeping these symbols as the only symbols in this file prevents
 * utility programs such as "ompi_info" from having to import entire
 * modules just to query their version and parameters
 */

#include "ompi_config.h"
#include "mpi.h"
#include "ompi/mca/fs/fs.h"
#include "ompi/mca/fs/base/base.h"
#include "ompi/mca/fs/lustre/fs_lustre.h"

/*
 * *******************************************************************
 * ************************ actions structure ************************
 * *******************************************************************
 */
static mca_fs_base_module_1_0_0_t lustre =  {
    mca_fs_lustre_module_init, /* initialise after being selected */
    mca_fs_lustre_module_finalize, /* close a module on a communicator */
    mca_fs_lustre_file_open,
    mca_fs_base_file_close,
    mca_fs_base_file_delete,
    mca_fs_base_file_set_size,
    mca_fs_base_file_get_size,
    mca_fs_base_file_sync
};
/*
 * *******************************************************************
 * ************************* structure ends **************************
 * *******************************************************************
 */

int mca_fs_lustre_component_init_query(bool enable_progress_threads,
                                      bool enable_mpi_threads)
{
    /* Nothing to do */

   return OMPI_SUCCESS;
}

struct mca_fs_base_module_1_0_0_t *
mca_fs_lustre_component_file_query (ompio_file_t *fh, int *priority)
{
    char *tmp;

    /* The code in this function is based on the ADIO FS selection in ROMIO
     *   Copyright (C) 1997 University of Chicago.
     *   See COPYRIGHT notice in top-level directory.
     */

    *priority = mca_fs_lustre_priority;

    tmp = strchr (fh->f_filename, ':');
    if (!tmp) {
        /* The communicator might be NULL if we only want to delete the file */
        if (OMPIO_ROOT == fh->f_rank || MPI_COMM_NULL == fh->f_comm) {
            fh->f_fstype = mca_fs_base_get_fstype ( (char *)fh->f_filename );
        }
        if (fh->f_comm != MPI_COMM_NULL) {
            fh->f_comm->c_coll->coll_bcast (&(fh->f_fstype),
                        1,
                        MPI_INT,
                        OMPIO_ROOT,
                        fh->f_comm,
                        fh->f_comm->c_coll->coll_bcast_module);
        }
    }
    else {
	if (!strncmp(fh->f_filename, "lustre:", 7) ||
	    !strncmp(fh->f_filename, "LUSTRE:", 7)) {
            fh->f_fstype = LUSTRE;
        }
    }

   if (LUSTRE == fh->f_fstype) {
       if (*priority < 50) {
           *priority = 50;
	   return &lustre;
       }
   }

   return NULL;
}

int mca_fs_lustre_component_file_unquery (ompio_file_t *file)
{
   /* This function might be needed for some purposes later. for now it
    * does not have anything to do since there are no steps which need
    * to be undone if this module is not selected */

    return OMPI_SUCCESS;
}

int mca_fs_lustre_module_init (ompio_file_t *file)
{
    /* Make sure the file type is not overwritten by the last queried
	 * component */
    file->f_fstype = LUSTRE;
    return OMPI_SUCCESS;
}


int mca_fs_lustre_module_finalize (ompio_file_t *file)
{
    return OMPI_SUCCESS;
}