/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 * vim:expandtab:shiftwidth=8:tabstop=8:
 */
/******************************************************************************\
*                                                                              *
*        Copyright (c) 2003, The Regents of the University of California       *
*      See the file COPYRIGHT for a complete copyright notice and license.     *
*                                                                              *
********************************************************************************
*
* Definitions and prototypes of abstract I/O interface
*
\******************************************************************************/

#include "aiori.h"

#if defined(HAVE_SYS_STATVFS_H)
#include <sys/statvfs.h>
#endif

#if defined(HAVE_SYS_STATFS_H)
#include <sys/statfs.h>
#endif

/*
 * Bind the global "backend" pointer to the requested backend AIORI's
 * function table.
 */

ior_aiori_t *available_aiori[] = {

#ifdef USE_HDF5_AIORI
        &hdf5_aiori,
#endif
#ifdef USE_HDFS_AIORI
        &hdfs_aiori,
#endif
#ifdef USE_MPIIO_AIORI
        &mpiio_aiori,
#endif
#ifdef USE_NCMPI_AIORI
        &ncmpi_aiori,
#endif
#ifdef USE_POSIX_AIORI
        &posix_aiori,
#endif
#ifdef USE_PLFS_AIORI
        &plfs_aiori,
#endif
#ifdef USE_S3_AIORI
        &s3_aiori,
        &s3_plus_aiori,
        &s3_emc_aiori,
#endif
        NULL
};

/**
 * Default statfs implementation.
 *
 * @param[in]  path       Path to run statfs on
 * @param[out] statfs_buf AIORI statfs buffer
 *
 * This function provides a AIORI statfs for POSIX-compliant filesystems. It
 * uses statvfs is available and falls back on statfs.
 */
static int aiori_statfs (const char *path, ior_aiori_statfs_t *stat_buf, IOR_param_t * param)
{
        int ret;
#if defined(HAVE_STATVFS)
        struct statvfs statfs_buf;

        ret = statvfs (path, &statfs_buf);
#else
        struct statfs statfs_buf;

        ret = statfs (path, &statfs_buf);
#endif
        if (-1 == ret) {
                return -1;
        }

        stat_buf->f_bsize = statfs_buf.f_bsize;
        stat_buf->f_blocks = statfs_buf.f_blocks;
        stat_buf->f_bfree = statfs_buf.f_bfree;
        stat_buf->f_files = statfs_buf.f_files;
        stat_buf->f_ffree = statfs_buf.f_ffree;

        return 0;
}

static int aiori_mkdir (const char *path, mode_t mode, IOR_param_t * param)
{
        return mkdir (path, mode);
}

static int aiori_rmdir (const char *path, IOR_param_t * param)
{
        return rmdir (path);
}

static int aiori_access (const char *path, int mode, IOR_param_t * param)
{
        return access (path, mode);
}

static int aiori_stat (const char *path, struct stat *buf, IOR_param_t * param)
{
        return stat (path, buf);
}

const ior_aiori_t *aiori_select (const char *api)
{
        for (ior_aiori_t **tmp = available_aiori ; *tmp != NULL; ++tmp) {
                if (NULL == api || strcmp(api, (*tmp)->name) == 0) {
                        if (NULL == (*tmp)->statfs) {
                                (*tmp)->statfs = aiori_statfs;
                        }
                        if (NULL == (*tmp)->mkdir) {
                                (*tmp)->mkdir = aiori_mkdir;
                        }
                        if (NULL == (*tmp)->rmdir) {
                                (*tmp)->rmdir = aiori_rmdir;
                        }
                        if (NULL == (*tmp)->access) {
                                (*tmp)->access = aiori_access;
                        }
                        if (NULL == (*tmp)->stat) {
                                (*tmp)->stat = aiori_stat;
                        }
                        return *tmp;
                }
        }

        return NULL;
}

int aiori_count (void)
{
        return sizeof (available_aiori)/sizeof(available_aiori[0]) - 1;
}

const char *aiori_default (void)
{
        if (aiori_count () > 0) {
                return available_aiori[0]->name;
        }

        return NULL;
}