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 3 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, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21
  22
  23 /* Return the number of TOSIZE-byte blocks used by
  24    BLOCKS FROMSIZE-byte blocks, rounding away from zero.
  25 */
  26 static SMB_BIG_UINT adjust_blocks(SMB_BIG_UINT blocks, SMB_BIG_UINT fromsize, SMB_BIG_UINT tosize)
  27 {
  28         if (fromsize == tosize) { /* e.g., from 512 to 512 */
  29                 return blocks;
  30         } else if (fromsize > tosize) { /* e.g., from 2048 to 512 */
  31                 return blocks * (fromsize / tosize);
  32         } else { /* e.g., from 256 to 512 */
  33                 /* Protect against broken filesystems... */
  34                 if (fromsize == 0) {
  35                         fromsize = tosize;
  36                 }
  37                 return (blocks + 1) / (tosize / fromsize);
  38         }
  39 }
  40
  41 /* this does all of the system specific guff to get the free disk space.
  42    It is derived from code in the GNU fileutils package, but has been
  43    considerably mangled for use here
  44
  45    results are returned in *dfree and *dsize, in 512 byte units
  46 */
  47 int sys_fsusage(const char *path, SMB_BIG_UINT *dfree, SMB_BIG_UINT *dsize)
  48 {
  49 #ifdef STAT_STATFS3_OSF1
  50 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_fsize, (SMB_BIG_UINT)512)
  51         struct statfs fsd;
  52
  53         if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
  54                 return -1;
  55 #endif /* STAT_STATFS3_OSF1 */
  56
  57 #ifdef STAT_STATFS2_FS_DATA     /* Ultrix */
  58 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)1024, (SMB_BIG_UINT)512)
  59         struct fs_data fsd;
  60
  61         if (statfs (path, &fsd) != 1)
  62                 return -1;
  63
  64         (*dsize) = CONVERT_BLOCKS (fsd.fd_req.btot);
  65         (*dfree) = CONVERT_BLOCKS (fsd.fd_req.bfreen);
  66 #endif /* STAT_STATFS2_FS_DATA */
  67
  68 #ifdef STAT_STATFS2_BSIZE       /* 4.3BSD, SunOS 4, HP-UX, AIX */
  69 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512)
  70         struct statfs fsd;
  71
  72         if (statfs (path, &fsd) < 0)
  73                 return -1;
  74
  75 #ifdef STATFS_TRUNCATES_BLOCK_COUNTS
  76         /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
  77            struct statfs are truncated to 2GB.  These conditions detect that
  78            truncation, presumably without botching the 4.1.1 case, in which
  79            the values are not truncated.  The correct counts are stored in
  80            undocumented spare fields.  */
  81         if (fsd.f_blocks == 0x1fffff && fsd.f_spare[0] > 0) {
  82                 fsd.f_blocks = fsd.f_spare[0];
  83                 fsd.f_bfree = fsd.f_spare[1];
  84                 fsd.f_bavail = fsd.f_spare[2];
  85         }
  86 #endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
  87 #endif /* STAT_STATFS2_BSIZE */
  88
  89
  90 #ifdef STAT_STATFS2_FSIZE       /* 4.4BSD */
  91 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_fsize, (SMB_BIG_UINT)512)
  92
  93         struct statfs fsd;
  94
  95         if (statfs (path, &fsd) < 0)
  96                 return -1;
  97 #endif /* STAT_STATFS2_FSIZE */
  98
  99 #ifdef STAT_STATFS4             /* SVR3, Dynix, Irix, AIX */
 100 # if _AIX || defined(_CRAY)
 101 #  define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512)
 102 #  ifdef _CRAY
 103 #   define f_bavail f_bfree
 104 #  endif
 105 # else
 106 #  define CONVERT_BLOCKS(B) ((SMB_BIG_UINT)B)
 107 #  ifndef _SEQUENT_             /* _SEQUENT_ is DYNIX/ptx */
 108 #   ifndef DOLPHIN              /* DOLPHIN 3.8.alfa/7.18 has f_bavail */
 109 #    define f_bavail f_bfree
 110 #   endif
 111 #  endif
 112 # endif
 113
 114         struct statfs fsd;
 115
 116         if (statfs (path, &fsd, sizeof fsd, 0) < 0)
 117                 return -1;
 118         /* Empirically, the block counts on most SVR3 and SVR3-derived
 119            systems seem to always be in terms of 512-byte blocks,
 120            no matter what value f_bsize has.  */
 121
 122 #endif /* STAT_STATFS4 */
 123
 124 #if defined(STAT_STATVFS) || defined(STAT_STATVFS64)            /* SVR4 */
 125 # define CONVERT_BLOCKS(B) \
 126         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)
 127
 128 #ifdef STAT_STATVFS64
 129         struct statvfs64 fsd;
 130         if (statvfs64(path, &fsd) < 0) return -1;
 131 #else
 132         struct statvfs fsd;
 133         if (statvfs(path, &fsd) < 0) return -1;
 134 #endif
 135
 136         /* f_frsize isn't guaranteed to be supported.  */
 137
 138 #endif /* STAT_STATVFS */
 139
 140 #ifndef CONVERT_BLOCKS
 141         /* we don't have any dfree code! */
 142         return -1;
 143 #else
 144 #if !defined(STAT_STATFS2_FS_DATA)
 145         /* !Ultrix */
 146         (*dsize) = CONVERT_BLOCKS (fsd.f_blocks);
 147         (*dfree) = CONVERT_BLOCKS (fsd.f_bavail);
 148 #endif /* not STAT_STATFS2_FS_DATA */
 149 #endif
 150
 151         return 0;
 152 }