src/fsusage.c

   1 /* fsusage.c -- return space usage of mounted filesystems
   2    Copyright (C) 1991, 1992 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 #include <config.h>
  20 #endif
  21
  22 #include <sys/types.h>
  23
  24 #ifdef HAVE_SYS_PARAM_H
  25 #include <sys/param.h>
  26 #endif
  27
  28 #ifdef HAVE_SYS_MOUNT_H
  29 #include <sys/mount.h>
  30 #endif
  31
  32 #ifdef HAVE_SYS_VFS_H
  33 #include <sys/vfs.h>
  34 #endif
  35
  36 #ifdef HAVE_SYS_FILSYS_H
  37 #include <sys/filsys.h>         /* SVR2.  */
  38 #endif
  39
  40 #include <stdlib.h>
  41
  42 #ifdef HAVE_SYS_STATFS_H
  43 #include <sys/statfs.h>
  44 #endif
  45
  46 #ifdef HAVE_DUSTAT_H            /* AIX PS/2.  */
  47 #include <sys/dustat.h>
  48 #endif
  49
  50 #ifdef HAVE_SYS_STATVFS_H       /* SVR4.  */
  51 #include <sys/statvfs.h>
  52 #endif
  53
  54 #include "global.h"
  55 #include "fsusage.h"
  56
  57
  58 #ifdef HAVE_INFOMOUNT
  59
  60 /* Return the number of TOSIZE-byte blocks used by
  61    BLOCKS FROMSIZE-byte blocks, rounding away from zero.
  62    TOSIZE must be positive.  Return -1 if FROMSIZE is not positive.  */
  63
  64 static long
  65 fs_adjust_blocks (long blocks, int fromsize, int tosize)
  66 {
  67     if (tosize <= 0)
  68         abort ();
  69     if (fromsize <= 0)
  70         return -1;
  71
  72     if (fromsize == tosize)     /* E.g., from 512 to 512.  */
  73         return blocks;
  74     else if (fromsize > tosize) /* E.g., from 2048 to 512.  */
  75         return blocks * (fromsize / tosize);
  76     else                        /* E.g., from 256 to 512.  */
  77         return (blocks + (blocks < 0 ? -1 : 1)) / (tosize / fromsize);
  78 }
  79
  80 #if defined(_AIX) && defined(_I386)
  81 /* AIX PS/2 does not supply statfs.  */
  82 static int aix_statfs (char *path, struct statfs *fsb)
  83 {
  84     struct stat stats;
  85     struct dustat fsd;
  86
  87     if (stat (path, &stats))
  88         return -1;
  89     if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
  90         return -1;
  91     fsb->f_type = 0;
  92     fsb->f_bsize = fsd.du_bsize;
  93     fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
  94     fsb->f_bfree = fsd.du_tfree;
  95     fsb->f_bavail = fsd.du_tfree;
  96     fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
  97     fsb->f_ffree = fsd.du_tinode;
  98     fsb->f_fsid.val[0] = fsd.du_site;
  99     fsb->f_fsid.val[1] = fsd.du_pckno;
 100     return 0;
 101 }
 102 #define statfs(path,fsb) aix_statfs(path,fsb)
 103 #endif                          /* _AIX && _I386 */
 104
 105 /* Fill in the fields of FSP with information about space usage for
 106    the filesystem on which PATH resides.
 107    Return 0 if successful, -1 if not. */
 108
 109 int get_fs_usage (char *path, struct fs_usage *fsp)
 110 {
 111 #ifdef STAT_STATFS3_OSF1
 112     struct statfs fsd;
 113
 114     if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
 115          return -1;
 116 #define CONVERT_BLOCKS(b) fs_adjust_blocks ((b), fsd.f_fsize, 512)
 117 #endif                          /* STAT_STATFS3_OSF1 */
 118
 119 #ifdef STAT_STATFS2_FS_DATA     /* Ultrix.  */
 120     struct fs_data fsd;
 121
 122     if (statfs (path, &fsd) != 1)
 123         return -1;
 124 #define CONVERT_BLOCKS(b) fs_adjust_blocks ((b), 1024, 512)
 125     fsp->fsu_blocks = CONVERT_BLOCKS (fsd.fd_req.btot);
 126     fsp->fsu_bfree = CONVERT_BLOCKS (fsd.fd_req.bfree);
 127     fsp->fsu_bavail = CONVERT_BLOCKS (fsd.fd_req.bfreen);
 128     fsp->fsu_files = fsd.fd_req.gtot;
 129     fsp->fsu_ffree = fsd.fd_req.gfree;
 130 #endif
 131
 132 #ifdef STAT_STATFS2_BSIZE       /* 4.3BSD, SunOS 4, HP-UX, AIX.  */
 133     struct statfs fsd;
 134
 135     if (statfs (path, &fsd) < 0)
 136         return -1;
 137 #define CONVERT_BLOCKS(b) fs_adjust_blocks ((b), fsd.f_bsize, 512)
 138 #endif
 139
 140 #ifdef STAT_STATFS2_FSIZE       /* 4.4BSD.  */
 141     struct statfs fsd;
 142
 143     if (statfs (path, &fsd) < 0)
 144         return -1;
 145 #define CONVERT_BLOCKS(b) fs_adjust_blocks ((b), fsd.f_fsize, 512)
 146 #endif
 147
 148 #ifdef STAT_STATFS4             /* SVR3, Dynix, Irix, AIX.  */
 149     struct statfs fsd;
 150
 151     if (statfs (path, &fsd, sizeof fsd, 0) < 0)
 152         return -1;
 153     /* Empirically, the block counts on most SVR3 and SVR3-derived
 154        systems seem to always be in terms of 512-byte blocks,
 155        no matter what value f_bsize has.  */
 156 #if _AIX
 157 #define CONVERT_BLOCKS(b) fs_adjust_blocks ((b), fsd.f_bsize, 512)
 158 #else
 159 #define CONVERT_BLOCKS(b) (b)
 160 #ifndef _SEQUENT_               /* _SEQUENT_ is DYNIX/ptx.  */
 161 #ifndef DOLPHIN                 /* DOLPHIN 3.8.alfa/7.18 has f_bavail */
 162 #define f_bavail f_bfree
 163 #endif
 164 #endif
 165 #endif
 166 #endif
 167
 168 #ifdef STAT_STATVFS             /* SVR4.  */
 169     struct statvfs fsd;
 170
 171     if (statvfs (path, &fsd) < 0)
 172         return -1;
 173     /* f_frsize isn't guaranteed to be supported.  */
 174 #define CONVERT_BLOCKS(b) \
 175   fs_adjust_blocks ((b), fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize, 512)
 176 #endif
 177
 178 #if defined(CONVERT_BLOCKS) && !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ_FILSYS)     /* !Ultrix && !SVR2.  */
 179     fsp->fsu_blocks = CONVERT_BLOCKS (fsd.f_blocks);
 180     fsp->fsu_bfree = CONVERT_BLOCKS (fsd.f_bfree);
 181     fsp->fsu_bavail = CONVERT_BLOCKS (fsd.f_bavail);
 182     fsp->fsu_files = fsd.f_files;
 183     fsp->fsu_ffree = fsd.f_ffree;
 184 #endif
 185
 186     return 0;
 187 }
 188
 189 #endif /* HAVE_INFOMOUNT */