Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

** See the GNU Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#include "zbxwin32.h"

​

#include "zbxstr.h"

#include "zbxlog.h"

​

/******************************************************************************

 *                                                                            *

 * Purpose: get file system cluster size for specified path (for cases when   *

 *          the file system is mounted on empty NTFS directory)               *

 *                                                                            *

 * Parameters: path  - [IN] file system path                                  *

 *             error - [OUT] error message                                    *

 *                                                                            *

 * Return value: On success, nonzero cluster size is returned                 *

 *               On error, 0 is returned.                                     *

 *                                                                            *

 ******************************************************************************/

zbx_uint64_t    zbx_get_cluster_size(const char *path, char **error)

{

    wchar_t     *disk = NULL, *wpath = NULL;

    unsigned long   sectors_per_cluster, bytes_per_sector, path_length;

    zbx_uint64_t    res = 0;

    char        *err_msg = "Cannot obtain file system cluster size:";

​

    wpath = zbx_utf8_to_unicode(path);

​

    /* Here GetFullPathName() is used in multithreaded application. */

    /* We assume it is safe because: */

    /*   - only file names with absolute paths are used (i.e. no relative paths) and */

    /*   - SetCurrentDirectory() is not used in Zabbix agent. */

​

    if (0 == (path_length = GetFullPathName(wpath, 0, NULL, NULL) + 1))

    {

        *error = zbx_dsprintf(*error, "%s GetFullPathName() failed: %s", err_msg,

                zbx_strerror_from_system(GetLastError()));

        goto err;

    }

​

    disk = (wchar_t *)zbx_malloc(NULL, path_length * sizeof(wchar_t));

​

    if (0 == GetVolumePathName(wpath, disk, path_length))

    {

        *error = zbx_dsprintf(*error, "%s GetVolumePathName() failed: %s", err_msg,

                zbx_strerror_from_system(GetLastError()));

        goto err;

    }

​

    if (0 == GetDiskFreeSpace(disk, &sectors_per_cluster, &bytes_per_sector, NULL, NULL))

    {

        *error = zbx_dsprintf(*error, "%s GetDiskFreeSpace() failed: %s", err_msg,

                zbx_strerror_from_system(GetLastError()));

        goto err;

    }

​

    res = (zbx_uint64_t)sectors_per_cluster * bytes_per_sector;

err:

    zbx_free(disk);

    zbx_free(wpath);

​

    return res;

}