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/****************************************************************
* *
* Copyright 2001, 2013 Fidelity Information Services, Inc *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
/* disk_block_available(int fd, int4 *ret, booleat_t fill_unix_holes)
* parameter:
* fd: file descriptor of the file that is located
* on the disk being examined
* *ret: address to put the number of available blocks
* fill_unix_holes
* TRUE ==> the calculation takes the
* hole in this file into consideration
* FALSE ==> plain system service
* return:
* 0: upon successful completion, the number of available
* blocks is put to ret.
* errno: as to why the request failed.
* note that DISK_BLOCK_SIZE is used here instead of GDS_BLOCK_SIZE,
* this is due to the intension to make this routine more general
*/
#include "mdef.h"
#include <errno.h>
#include "gtm_unistd.h"
#include "gtm_stat.h"
#include "gtm_statvfs.h"
#ifndef __MVS__
#if !defined(sun) && !defined(__CYGWIN__)
#include <sys/dir.h>
#endif
#include <sys/param.h>
#else
#define DEV_BSIZE fstat_buf.st_blksize
#endif
#include "have_crit.h"
#include "eintr_wrappers.h"
#include "disk_block_available.h"
int4 disk_block_available(int fd, gtm_uint64_t *ret, boolean_t fill_unix_holes)
{
struct stat fstat_buf;
struct statvfs fstatvfs_buf;
int status;
FSTATVFS_FILE(fd, &fstatvfs_buf, status);
if (-1 == status)
return errno;
*ret = (gtm_uint64_t)((fstatvfs_buf.f_frsize / DISK_BLOCK_SIZE) * fstatvfs_buf.f_bavail);
if (fill_unix_holes)
{
FSTAT_FILE(fd, &fstat_buf, status);
if (-1 == status)
return errno;
*ret -= (gtm_uint64_t)(DEV_BSIZE / DISK_BLOCK_SIZE
* (DIVIDE_ROUND_UP(fstat_buf.st_size, DEV_BSIZE) - fstat_buf.st_blocks));
}
return 0;
}
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