source/lib/fsusage.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    functions to calculate the free disk space
   4    Copyright (C) Andrew Tridgell 1998-2000
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23
  24 /* Return the number of TOSIZE-byte blocks used by
  25    BLOCKS FROMSIZE-byte blocks, rounding away from zero.
  26 */
  27 static SMB_BIG_UINT adjust_blocks(SMB_BIG_UINT blocks, SMB_BIG_UINT fromsize, SMB_BIG_UINT tosize)
  28 {
  29         if (fromsize == tosize) { /* e.g., from 512 to 512 */
  30                 return blocks;
  31         } else if (fromsize > tosize) { /* e.g., from 2048 to 512 */
  32                 return blocks * (fromsize / tosize);
  33         } else { /* e.g., from 256 to 512 */
  34                 /* Protect against broken filesystems... */
  35                 if (fromsize == 0) {
  36                         fromsize = tosize;
  37                 }
  38                 return (blocks + 1) / (tosize / fromsize);
  39         }
  40 }
  41
  42 /* this does all of the system specific guff to get the free disk space.
  43    It is derived from code in the GNU fileutils package, but has been
  44    considerably mangled for use here
  45
  46    results are returned in *dfree and *dsize, in 512 byte units
  47 */
  48 int sys_fsusage(const char *path, SMB_BIG_UINT *dfree, SMB_BIG_UINT *dsize)
  49 {
  50 #ifdef STAT_STATFS3_OSF1
  51 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_fsize, (SMB_BIG_UINT)512)
  52         struct statfs fsd;
  53
  54         if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
  55                 return -1;
  56 #endif /* STAT_STATFS3_OSF1 */
  57
  58 #ifdef STAT_STATFS2_FS_DATA     /* Ultrix */
  59 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)1024, (SMB_BIG_UINT)512)
  60         struct fs_data fsd;
  61
  62         if (statfs (path, &fsd) != 1)
  63                 return -1;
  64
  65         (*dsize) = CONVERT_BLOCKS (fsd.fd_req.btot);
  66         (*dfree) = CONVERT_BLOCKS (fsd.fd_req.bfreen);
  67 #endif /* STAT_STATFS2_FS_DATA */
  68
  69 #ifdef STAT_STATFS2_BSIZE       /* 4.3BSD, SunOS 4, HP-UX, AIX */
  70 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512)
  71         struct statfs fsd;
  72
  73         if (statfs (path, &fsd) < 0)
  74                 return -1;
  75
  76 #ifdef STATFS_TRUNCATES_BLOCK_COUNTS
  77         /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
  78            struct statfs are truncated to 2GB.  These conditions detect that
  79            truncation, presumably without botching the 4.1.1 case, in which
  80            the values are not truncated.  The correct counts are stored in
  81            undocumented spare fields.  */
  82         if (fsd.f_blocks == 0x1fffff && fsd.f_spare[0] > 0) {
  83                 fsd.f_blocks = fsd.f_spare[0];
  84                 fsd.f_bfree = fsd.f_spare[1];
  85                 fsd.f_bavail = fsd.f_spare[2];
  86         }
  87 #endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
  88 #endif /* STAT_STATFS2_BSIZE */
  89
  90
  91 #ifdef STAT_STATFS2_FSIZE       /* 4.4BSD */
  92 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_fsize, (SMB_BIG_UINT)512)
  93
  94         struct statfs fsd;
  95
  96         if (statfs (path, &fsd) < 0)
  97                 return -1;
  98 #endif /* STAT_STATFS2_FSIZE */
  99
 100 #ifdef STAT_STATFS4             /* SVR3, Dynix, Irix, AIX */
 101 # if _AIX || defined(_CRAY)
 102 #  define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512)
 103 #  ifdef _CRAY
 104 #   define f_bavail f_bfree
 105 #  endif
 106 # else
 107 #  define CONVERT_BLOCKS(B) ((SMB_BIG_UINT)B)
 108 #  ifndef _SEQUENT_             /* _SEQUENT_ is DYNIX/ptx */
 109 #   ifndef DOLPHIN              /* DOLPHIN 3.8.alfa/7.18 has f_bavail */
 110 #    define f_bavail f_bfree
 111 #   endif
 112 #  endif
 113 # endif
 114
 115         struct statfs fsd;
 116
 117         if (statfs (path, &fsd, sizeof fsd, 0) < 0)
 118                 return -1;
 119         /* Empirically, the block counts on most SVR3 and SVR3-derived
 120            systems seem to always be in terms of 512-byte blocks,
 121            no matter what value f_bsize has.  */
 122
 123 #endif /* STAT_STATFS4 */
 124
 125 #if defined(STAT_STATVFS) || defined(STAT_STATVFS64)            /* SVR4 */
 126 # define CONVERT_BLOCKS(B) \
 127         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)
 128
 129 #ifdef STAT_STATVFS64
 130         struct statvfs64 fsd;
 131         if (statvfs64(path, &fsd) < 0) return -1;
 132 #else
 133         struct statvfs fsd;
 134         if (statvfs(path, &fsd) < 0) return -1;
 135 #endif
 136
 137         /* f_frsize isn't guaranteed to be supported.  */
 138
 139 #endif /* STAT_STATVFS */
 140
 141 #ifndef CONVERT_BLOCKS
 142         /* we don't have any dfree code! */
 143         return -1;
 144 #else
 145 #if !defined(STAT_STATFS2_FS_DATA)
 146         /* !Ultrix */
 147         (*dsize) = CONVERT_BLOCKS (fsd.f_blocks);
 148         (*dfree) = CONVERT_BLOCKS (fsd.f_bavail);
 149 #endif /* not STAT_STATFS2_FS_DATA */
 150 #endif
 151
 152         return 0;
 153 }