/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *
 *   Copyright (C) 1997 University of Chicago.
 *   See COPYRIGHT notice in top-level directory.
 */

#include "ad_xfs.h"
#include "adio_extern.h"

static unsigned xfs_direct_read_chunk_size;
static unsigned xfs_direct_write_chunk_size;

void ADIOI_XFS_SetInfo(ADIO_File fd, MPI_Info users_info, int *error_code)
{
    char *value, *c;
    int flag;
    static char xfs_initialized = 0;

    if (fd->info == MPI_INFO_NULL)
        MPI_Info_create(&(fd->info));

    ADIOI_Info_set(fd->info, "direct_read", "false");
    ADIOI_Info_set(fd->info, "direct_write", "false");
    fd->direct_read = fd->direct_write = 0;

    if (!xfs_initialized) {
        xfs_initialized = 1;
        c = getenv("MPIO_DIRECT_READ_CHUNK_SIZE");
        if (c) {
            int io;
            io = atoi(c);
            if (io <= 0) {
                fprintf(stderr,
                        "MPI: Ignoring an invalid setting for MPIO_DIRECT_READ_CHUNK_SIZE.\n"
                        "     It must be set to a positive integer value.\n");
            } else {
                xfs_direct_read_chunk_size = io;
            }
        } else {
            xfs_direct_read_chunk_size = 0;
        }

        c = getenv("MPIO_DIRECT_WRITE_CHUNK_SIZE");
        if (c) {
            int io;
            io = atoi(c);
            if (io <= 0) {
                fprintf(stderr,
                        "MPI: Ignoring an invalid setting for MPIO_DIRECT_WRITE_CHUNK_SIZE.\n"
                        "     It must be set to a positive integer value.\n");
            } else {
                xfs_direct_write_chunk_size = io;
            }
        } else {
            xfs_direct_write_chunk_size = 0;
        }
    }

    if (!fd->hints->initialized) {
        fd->hints->fs_hints.xfs.read_chunk_sz = xfs_direct_read_chunk_size;
        fd->hints->fs_hints.xfs.write_chunk_sz = xfs_direct_write_chunk_size;
    }

    /* has user specified values for keys "direct_read" and "direct write"? */
    if (users_info != MPI_INFO_NULL) {
        value = (char *) ADIOI_Malloc((MPI_MAX_INFO_VAL + 1) * sizeof(char));

        ADIOI_Info_get(users_info, "direct_read", MPI_MAX_INFO_VAL, value, &flag);
        if (flag && !strcmp(value, "true")) {
            ADIOI_Info_set(fd->info, "direct_read", "true");
            fd->direct_read = 1;
        }

        ADIOI_Info_get(users_info, "direct_write", MPI_MAX_INFO_VAL, value, &flag);
        if (flag && !strcmp(value, "true")) {
            ADIOI_Info_set(fd->info, "direct_write", "true");
            fd->direct_write = 1;
        }

        ADIOI_Free(value);
    }

    /* set the values for collective I/O and data sieving parameters */
    ADIOI_GEN_SetInfo(fd, users_info, error_code);

    /* Environment variables override MPI_Info hints */
    if (ADIOI_Direct_read)
        fd->direct_read = 1;
    if (ADIOI_Direct_write)
        fd->direct_write = 1;

    /* environment variables checked in ADIO_Init */

    *error_code = MPI_SUCCESS;
}
