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libs/ck-libs/ampi/romio/adio/ad_xfs/ad_xfs_open.c

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

#define _GNU_SOURCE          // for O_DIRECT

#include "ad_xfs.h"
#include <sys/ioctl.h>
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif

#ifndef HAVE_LSEEK64
#define lseek64 lseek
#endif

void ADIOI_XFS_Open(ADIO_File fd, int *error_code)
{
    int perm, amode, amode_direct, factor;
    unsigned int old_mask;
    struct dioattr st;
    static char myname[] = "ADIOI_XFS_OPEN";
    unsigned read_chunk_sz = fd->hints->fs_hints.xfs.read_chunk_sz;
    unsigned write_chunk_sz = fd->hints->fs_hints.xfs.write_chunk_sz;

    if (fd->perm == ADIO_PERM_NULL) {
    old_mask = umask(022);
    umask(old_mask);
    perm = old_mask ^ 0666;
    }
    else perm = fd->perm;

    amode = 0;
    if (fd->access_mode & ADIO_CREATE)
    amode = amode | O_CREAT;
    if (fd->access_mode & ADIO_RDONLY)
    amode = amode | O_RDONLY;
    if (fd->access_mode & ADIO_WRONLY)
    amode = amode | O_WRONLY;
    if (fd->access_mode & ADIO_RDWR)
    amode = amode | O_RDWR;

    amode_direct = amode | O_DIRECT;

    if (fd->access_mode & ADIO_EXCL)
    amode = amode | O_EXCL;

    fd->fd_sys = open(fd->filename, amode, perm);

    fd->fd_direct = open(fd->filename, amode_direct, perm);
    if (fd->fd_direct != -1) {

#if defined(MPISGI)
    ioctl(fd->fd_direct, XFS_IOC_DIOINFO, &st);
#else
    fcntl(fd->fd_direct, F_DIOINFO, &st);
#endif

    fd->d_mem = st.d_mem;
    fd->d_miniosz = st.d_miniosz;

    if (read_chunk_sz == 0) {
        fd->hints->fs_hints.xfs.read_chunk_sz = st.d_maxiosz;
    } else {
        /*
         * MPIO_DIRECT_READ_CHUNK_SIZE was set.
         * Make read_chunk_sz a multiple of d_miniosz.
         */
        factor = read_chunk_sz / fd->d_miniosz;
        if (factor == 0 || read_chunk_sz != fd->d_miniosz * factor) {
            fd->hints->fs_hints.xfs.read_chunk_sz =
                fd->d_miniosz * (factor + 1);
        }
    }

    if (write_chunk_sz == 0) {
        fd->hints->fs_hints.xfs.write_chunk_sz = st.d_maxiosz;
    } else {
        /*
         * MPIO_DIRECT_WRITE_CHUNK_SIZE was set. 
         * Make write_chunk_sz a multiple of d_miniosz.
         */
        factor = write_chunk_sz / fd->d_miniosz;
        if (factor == 0 || write_chunk_sz != fd->d_miniosz * factor) {
            fd->hints->fs_hints.xfs.write_chunk_sz =
                fd->d_miniosz * (factor + 1);
        }
    }

    if (fd->d_mem > XFS_MEMALIGN) {
        FPRINTF(stderr, "MPI: Run-time Direct-IO memory alignment, %d, does not match compile-time value, %d.\n",
        fd->d_mem, XFS_MEMALIGN);
        FPRINTF(stderr, "MPI: Report this error and rerun with Direct-IO disabled.\n");
        close(fd->fd_direct);
        fd->fd_direct = -1;
    }
    }

    if ((fd->fd_sys != -1) && (fd->access_mode & ADIO_APPEND))
    fd->fp_ind = lseek64(fd->fd_sys, 0, SEEK_END);

    fd->fp_sys_posn = -1; /* set it to null because we use pread/pwrite */

    if ((fd->fd_sys == -1) || (fd->fd_direct == -1)) {
    *error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
                       myname, __LINE__, MPI_ERR_IO, "**io",
                       "**io %s", strerror(errno));
    }
    else *error_code = MPI_SUCCESS;
}

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