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/* fsusage.c -- return space usage of mounted filesystems
Copyright (C) 1991, 1992 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <sys/types.h>
#include "fsusage.h"
int statfs ();
#if defined(STAT_STATFS2_BSIZE) && !defined(_IBMR2) /* 4.3BSD, SunOS 4, HP-UX, AIX PS/2. */
#include <sys/vfs.h>
#endif
#ifdef STAT_STATFS2_FSIZE /* 4.4BSD. */
#include <sys/mount.h>
#endif
#ifdef STAT_STATFS2_FS_DATA /* Ultrix. */
#include <sys/param.h>
#include <sys/mount.h>
#endif
#ifdef STAT_READ /* SVR2. */
#include <sys/param.h>
#include <sys/filsys.h>
#include <fcntl.h>
#endif
#if defined(STAT_STATFS4) || (defined(_AIX) && defined(_IBMR2)) /* SVR3, Dynix, Irix, AIX RS6000. */
#include <sys/statfs.h>
#endif
#if defined(_AIX) && defined(_I386) /* AIX PS/2. */
#include <sys/stat.h>
#include <sys/dustat.h>
#endif
#ifdef STAT_STATVFS /* SVR4. */
#include <sys/statvfs.h>
int statvfs ();
#endif
/* Return the number of TOSIZE-byte blocks used by
BLOCKS FROMSIZE-byte blocks, rounding up. */
static long
adjust_blocks (blocks, fromsize, tosize)
long blocks;
int fromsize, tosize;
{
if (fromsize == tosize) /* E.g., from 512 to 512. */
return blocks;
else if (fromsize > tosize) /* E.g., from 2048 to 512. */
return blocks * (fromsize / tosize);
else /* E.g., from 256 to 512. */
return (blocks + 1) / (tosize / fromsize);
}
/* Fill in the fields of FSP with information about space usage for
the filesystem on which PATH resides.
DISK is the device on which PATH is mounted, for space-getting
methods that need to know it.
Return 0 if successful, -1 if not. */
int
get_fs_usage (path, disk, fsp)
char *path, *disk;
struct fs_usage *fsp;
{
#ifdef STAT_STATFS2_FS_DATA /* Ultrix. */
struct fs_data fsd;
if (statfs (path, &fsd) != 1)
return -1;
#define convert_blocks(b) adjust_blocks ((b), 1024, 512)
fsp->fsu_blocks = convert_blocks (fsd.fd_req.btot);
fsp->fsu_bfree = convert_blocks (fsd.fd_req.bfree);
fsp->fsu_bavail = convert_blocks (fsd.fd_req.bfreen);
fsp->fsu_files = fsd.fd_req.gtot;
fsp->fsu_ffree = fsd.fd_req.gfree;
#endif
#ifdef STAT_READ /* SVR2. */
#ifndef SUPERBOFF
#define SUPERBOFF (SUPERB * 512)
#endif
struct filsys fsd;
int fd;
fd = open (disk, O_RDONLY);
if (fd < 0)
return -1;
lseek (fd, (long) SUPERBOFF, 0);
if (read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
{
close (fd);
return -1;
}
close (fd);
#define convert_blocks(b) adjust_blocks ((b), (fsd.s_type == Fs2b ? 1024 : 512), 512)
fsp->fsu_blocks = convert_blocks (fsd.s_fsize);
fsp->fsu_bfree = convert_blocks (fsd.s_tfree);
fsp->fsu_bavail = convert_blocks (fsd.s_tfree);
fsp->fsu_files = (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1);
fsp->fsu_ffree = fsd.s_tinode;
#endif
#ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX. */
struct statfs fsd;
if (statfs (path, &fsd) < 0)
return -1;
#define convert_blocks(b) adjust_blocks ((b), fsd.f_bsize, 512)
#endif
#ifdef STAT_STATFS2_FSIZE /* 4.4BSD. */
struct statfs fsd;
if (statfs (path, &fsd) < 0)
return -1;
#define convert_blocks(b) adjust_blocks ((b), fsd.f_fsize, 512)
#endif
#ifdef STAT_STATFS4 /* SVR3, Dynix, Irix. */
struct statfs fsd;
if (statfs (path, &fsd, sizeof fsd, 0) < 0)
return -1;
/* Empirically, the block counts on most SVR3 and SVR3-derived
systems seem to always be in terms of 512-byte blocks,
no matter what value f_bsize has. */
#define convert_blocks(b) (b)
#ifndef _SEQUENT_ /* _SEQUENT_ is DYNIX/ptx. */
#define f_bavail f_bfree
#endif
#endif
#ifdef STAT_STATVFS /* SVR4. */
struct statvfs fsd;
if (statvfs (path, &fsd) < 0)
return -1;
/* f_frsize isn't guaranteed to be supported. */
#define convert_blocks(b) \
adjust_blocks ((b), fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize, 512)
#endif
#if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ) /* !Ultrix && !SVR2. */
fsp->fsu_blocks = convert_blocks (fsd.f_blocks);
fsp->fsu_bfree = convert_blocks (fsd.f_bfree);
fsp->fsu_bavail = convert_blocks (fsd.f_bavail);
fsp->fsu_files = fsd.f_files;
fsp->fsu_ffree = fsd.f_ffree;
#endif
return 0;
}
#if defined(_AIX) && defined(_I386)
/* AIX PS/2 does not supply statfs. */
int
statfs (path, fsb)
char *path;
struct statfs *fsb;
{
struct stat stats;
struct dustat fsd;
if (stat (path, &stats))
return -1;
if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
return -1;
fsb->f_type = 0;
fsb->f_bsize = fsd.du_bsize;
fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
fsb->f_bfree = fsd.du_tfree;
fsb->f_bavail = fsd.du_tfree;
fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
fsb->f_ffree = fsd.du_tinode;
fsb->f_fsid.val[0] = fsd.du_site;
fsb->f_fsid.val[1] = fsd.du_pckno;
return 0;
}
#endif /* _AIX && _I386 */
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