source3/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                 return (blocks + 1) / (tosize / fromsize);
  35 }
  36
  37 /* this does all of the system specific guff to get the free disk space.
  38    It is derived from code in the GNU fileutils package, but has been
  39    considerably mangled for use here
  40
  41    results are returned in *dfree and *dsize, in 512 byte units
  42 */
  43 int sys_fsusage(const char *path, SMB_BIG_UINT *dfree, SMB_BIG_UINT *dsize)
  44 {
  45 #ifdef STAT_STATFS3_OSF1
  46 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_fsize, (SMB_BIG_UINT)512)
  47         struct statfs fsd;
  48
  49         if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
  50                 return -1;
  51 #endif /* STAT_STATFS3_OSF1 */
  52
  53 #ifdef STAT_STATFS2_FS_DATA     /* Ultrix */
  54 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)1024, (SMB_BIG_UINT)512)
  55         struct fs_data fsd;
  56
  57         if (statfs (path, &fsd) != 1)
  58                 return -1;
  59
  60         (*dsize) = CONVERT_BLOCKS (fsd.fd_req.btot);
  61         (*dfree) = CONVERT_BLOCKS (fsd.fd_req.bfreen);
  62 #endif /* STAT_STATFS2_FS_DATA */
  63
  64 #ifdef STAT_STATFS2_BSIZE       /* 4.3BSD, SunOS 4, HP-UX, AIX */
  65 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512)
  66         struct statfs fsd;
  67
  68         if (statfs (path, &fsd) < 0)
  69                 return -1;
  70
  71 #ifdef STATFS_TRUNCATES_BLOCK_COUNTS
  72         /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
  73            struct statfs are truncated to 2GB.  These conditions detect that
  74            truncation, presumably without botching the 4.1.1 case, in which
  75            the values are not truncated.  The correct counts are stored in
  76            undocumented spare fields.  */
  77         if (fsd.f_blocks == 0x1fffff && fsd.f_spare[0] > 0) {
  78                 fsd.f_blocks = fsd.f_spare[0];
  79                 fsd.f_bfree = fsd.f_spare[1];
  80                 fsd.f_bavail = fsd.f_spare[2];
  81         }
  82 #endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
  83 #endif /* STAT_STATFS2_BSIZE */
  84
  85
  86 #ifdef STAT_STATFS2_FSIZE       /* 4.4BSD */
  87 #define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_fsize, (SMB_BIG_UINT)512)
  88
  89         struct statfs fsd;
  90
  91         if (statfs (path, &fsd) < 0)
  92                 return -1;
  93 #endif /* STAT_STATFS2_FSIZE */
  94
  95 #ifdef STAT_STATFS4             /* SVR3, Dynix, Irix, AIX */
  96 # if _AIX || defined(_CRAY)
  97 #  define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512)
  98 #  ifdef _CRAY
  99 #   define f_bavail f_bfree
 100 #  endif
 101 # else
 102 #  define CONVERT_BLOCKS(B) ((SMB_BIG_UINT)B)
 103 #  ifndef _SEQUENT_             /* _SEQUENT_ is DYNIX/ptx */
 104 #   ifndef DOLPHIN              /* DOLPHIN 3.8.alfa/7.18 has f_bavail */
 105 #    define f_bavail f_bfree
 106 #   endif
 107 #  endif
 108 # endif
 109
 110         struct statfs fsd;
 111
 112         if (statfs (path, &fsd, sizeof fsd, 0) < 0)
 113                 return -1;
 114         /* Empirically, the block counts on most SVR3 and SVR3-derived
 115            systems seem to always be in terms of 512-byte blocks,
 116            no matter what value f_bsize has.  */
 117
 118 #endif /* STAT_STATFS4 */
 119
 120 #if defined(STAT_STATVFS) || defined(STAT_STATVFS64)            /* SVR4 */
 121 # define CONVERT_BLOCKS(B) \
 122         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)
 123
 124 #ifdef STAT_STATVFS64
 125         struct statvfs64 fsd;
 126         if (statvfs64(path, &fsd) < 0) return -1;
 127 #else
 128         struct statvfs fsd;
 129         if (statvfs(path, &fsd) < 0) return -1;
 130 #endif
 131
 132         /* f_frsize isn't guaranteed to be supported.  */
 133
 134 #endif /* STAT_STATVFS */
 135
 136 #ifndef CONVERT_BLOCKS
 137         /* we don't have any dfree code! */
 138         return -1;
 139 #else
 140 #if !defined(STAT_STATFS2_FS_DATA)
 141         /* !Ultrix */
 142         (*dsize) = CONVERT_BLOCKS (fsd.f_blocks);
 143         (*dfree) = CONVERT_BLOCKS (fsd.f_bavail);
 144 #endif /* not STAT_STATFS2_FS_DATA */
 145 #endif
 146
 147         return 0;
 148 }