source/lib/fsusage.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0.
   4    functions to calculate the free disk space
   5    Copyright (C) Andrew Tridgell 1998-2000
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24
  25 /* Return the number of TOSIZE-byte blocks used by
  26    BLOCKS FROMSIZE-byte blocks, rounding away from zero.
  27 */
  28 static SMB_BIG_UINT adjust_blocks(SMB_BIG_UINT blocks, SMB_BIG_UINT fromsize, SMB_BIG_UINT tosize)
  29 {
  30         if (fromsize == tosize) /* e.g., from 512 to 512 */
  31                 return blocks;
  32         else if (fromsize > tosize)     /* e.g., from 2048 to 512 */
  33                 return blocks * (fromsize / tosize);
  34         else                            /* e.g., from 256 to 512 */
  35                 return (blocks + 1) / (tosize / fromsize);
  36 }
  37
  38 /* this does all of the system specific guff to get the free disk space.
  39    It is derived from code in the GNU fileutils package, but has been
  40    considerably mangled for use here
  41
  42    results are returned in *dfree and *dsize, in 512 byte units
  43 */
  44 int sys_fsusage(const char *path, SMB_BIG_UINT *dfree, SMB_BIG_UINT *dsize)
  45 {
  46 #ifdef STAT_STATFS3_OSF1
  47 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_fsize, (SMB_BIG_UINT)512)
  48         struct statfs fsd;
  49
  50         if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
  51                 return -1;
  52 #endif /* STAT_STATFS3_OSF1 */
  53
  54 #ifdef STAT_STATFS2_FS_DATA     /* Ultrix */
  55 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)1024, (SMB_BIG_UINT)512)
  56         struct fs_data fsd;
  57
  58         if (statfs (path, &fsd) != 1)
  59                 return -1;
  60
  61         (*dsize) = CONVERT_BLOCKS (fsd.fd_req.btot);
  62         (*dfree) = CONVERT_BLOCKS (fsd.fd_req.bfreen);
  63 #endif /* STAT_STATFS2_FS_DATA */
  64
  65 #ifdef STAT_STATFS2_BSIZE       /* 4.3BSD, SunOS 4, HP-UX, AIX */
  66 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512)
  67         struct statfs fsd;
  68
  69         if (statfs (path, &fsd) < 0)
  70                 return -1;
  71
  72 #ifdef STATFS_TRUNCATES_BLOCK_COUNTS
  73         /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
  74            struct statfs are truncated to 2GB.  These conditions detect that
  75            truncation, presumably without botching the 4.1.1 case, in which
  76            the values are not truncated.  The correct counts are stored in
  77            undocumented spare fields.  */
  78         if (fsd.f_blocks == 0x1fffff && fsd.f_spare[0] > 0) {
  79                 fsd.f_blocks = fsd.f_spare[0];
  80                 fsd.f_bfree = fsd.f_spare[1];
  81                 fsd.f_bavail = fsd.f_spare[2];
  82         }
  83 #endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
  84 #endif /* STAT_STATFS2_BSIZE */
  85
  86
  87 #ifdef STAT_STATFS2_FSIZE       /* 4.4BSD */
  88 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_fsize, (SMB_BIG_UINT)512)
  89
  90         struct statfs fsd;
  91
  92         if (statfs (path, &fsd) < 0)
  93                 return -1;
  94 #endif /* STAT_STATFS2_FSIZE */
  95
  96 #ifdef STAT_STATFS4             /* SVR3, Dynix, Irix, AIX */
  97 # if _AIX || defined(_CRAY)
  98 #  define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512)
  99 #  ifdef _CRAY
 100 #   define f_bavail f_bfree
 101 #  endif
 102 # else
 103 #  define CONVERT_BLOCKS(B) ((SMB_BIG_UINT)B)
 104 #  ifndef _SEQUENT_             /* _SEQUENT_ is DYNIX/ptx */
 105 #   ifndef DOLPHIN              /* DOLPHIN 3.8.alfa/7.18 has f_bavail */
 106 #    define f_bavail f_bfree
 107 #   endif
 108 #  endif
 109 # endif
 110
 111         struct statfs fsd;
 112
 113         if (statfs (path, &fsd, sizeof fsd, 0) < 0)
 114                 return -1;
 115         /* Empirically, the block counts on most SVR3 and SVR3-derived
 116            systems seem to always be in terms of 512-byte blocks,
 117            no matter what value f_bsize has.  */
 118
 119 #endif /* STAT_STATFS4 */
 120
 121 #if defined(STAT_STATVFS) || defined(STAT_STATVFS64)            /* SVR4 */
 122 # define CONVERT_BLOCKS(B) \
 123         adjust_blocks ((SMB_BIG_UINT)(B), fsd.f_frsize ? (SMB_BIG_UINT)fsd.f_frsize : (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512)
 124
 125 #ifdef STAT_STATVFS64
 126         struct statvfs64 fsd;
 127         if (statvfs64(path, &fsd) < 0) return -1;
 128 #else
 129         struct statvfs fsd;
 130         if (statvfs(path, &fsd) < 0) return -1;
 131 #endif
 132
 133         /* f_frsize isn't guaranteed to be supported.  */
 134
 135 #endif /* STAT_STATVFS */
 136
 137 #ifndef CONVERT_BLOCKS
 138         /* we don't have any dfree code! */
 139         return -1;
 140 #else
 141 #if !defined(STAT_STATFS2_FS_DATA)
 142         /* !Ultrix */
 143         (*dsize) = CONVERT_BLOCKS (fsd.f_blocks);
 144         (*dfree) = CONVERT_BLOCKS (fsd.f_bavail);
 145 #endif /* not STAT_STATFS2_FS_DATA */
 146 #endif
 147
 148         return 0;
 149 }