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annotate lib/fsusage.c @ 17249:e542fd46ad6f

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maint: update all copyright year number ranges Run "make update-copyright". Compare to commit 1602f0a from last year. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Tue, 01 Jan 2013 00:50:58 +0000
parents 9fc45cd5d9b5
children
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1 /* fsusage.c -- return space usage of mounted file systems
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2
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3 Copyright (C) 1991-1992, 1996, 1998-1999, 2002-2006, 2009-2013 Free Software
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4 Foundation, Inc.
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5
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6 This program is free software: you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3 of the License, or
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9 (at your option) any later version.
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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18
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19 #include <config.h>
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20
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21 #include "fsusage.h"
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22
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23 #include <limits.h>
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24 #include <sys/types.h>
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25
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26 #if STAT_STATVFS || STAT_STATVFS64 /* POSIX 1003.1-2001 (and later) with XSI */
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27 # include <sys/statvfs.h>
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28 #else
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29 /* Don't include backward-compatibility files unless they're needed.
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30 Eventually we'd like to remove all this cruft. */
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31 # include <fcntl.h>
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32 # include <unistd.h>
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33 # include <sys/stat.h>
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34 #if HAVE_SYS_PARAM_H
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35 # include <sys/param.h>
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36 #endif
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37 #if HAVE_SYS_MOUNT_H
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38 # include <sys/mount.h>
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39 #endif
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40 #if HAVE_SYS_VFS_H
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41 # include <sys/vfs.h>
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42 #endif
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43 # if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
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44 # include <sys/fs/s5param.h>
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45 # endif
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46 # if defined HAVE_SYS_FILSYS_H && !defined _CRAY
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47 # include <sys/filsys.h> /* SVR2 */
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48 # endif
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49 # if HAVE_SYS_STATFS_H
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50 # include <sys/statfs.h>
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51 # endif
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52 # if HAVE_DUSTAT_H /* AIX PS/2 */
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53 # include <sys/dustat.h>
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54 # endif
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55 # include "full-read.h"
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56 #endif
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57
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58 /* The results of open() in this file are not used with fchdir,
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59 therefore save some unnecessary work in fchdir.c. */
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60 #undef open
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61 #undef close
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62
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63 /* Many space usage primitives use all 1 bits to denote a value that is
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64 not applicable or unknown. Propagate this information by returning
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65 a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
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66 is unsigned and narrower than uintmax_t. */
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67 #define PROPAGATE_ALL_ONES(x) \
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68 ((sizeof (x) < sizeof (uintmax_t) \
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69 && (~ (x) == (sizeof (x) < sizeof (int) \
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70 ? - (1 << (sizeof (x) * CHAR_BIT)) \
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71 : 0))) \
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72 ? UINTMAX_MAX : (uintmax_t) (x))
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73
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74 /* Extract the top bit of X as an uintmax_t value. */
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75 #define EXTRACT_TOP_BIT(x) ((x) \
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76 & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
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77
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78 /* If a value is negative, many space usage primitives store it into an
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79 integer variable by assignment, even if the variable's type is unsigned.
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80 So, if a space usage variable X's top bit is set, convert X to the
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81 uintmax_t value V such that (- (uintmax_t) V) is the negative of
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82 the original value. If X's top bit is clear, just yield X.
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83 Use PROPAGATE_TOP_BIT if the original value might be negative;
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84 otherwise, use PROPAGATE_ALL_ONES. */
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85 #define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
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86
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87 #ifdef STAT_STATVFS
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88 /* Return true if statvfs works. This is false for statvfs on systems
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89 with GNU libc on Linux kernels before 2.6.36, which stats all
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90 preceding entries in /proc/mounts; that makes df hang if even one
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91 of the corresponding file systems is hard-mounted but not available. */
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92 # if ! (__linux__ && (__GLIBC__ || __UCLIBC__))
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93 /* The FRSIZE fallback is not required in this case. */
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94 # undef STAT_STATFS2_FRSIZE
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95 static int statvfs_works (void) { return 1; }
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96 # else
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97 # include <string.h> /* for strverscmp */
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98 # include <sys/utsname.h>
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99 # include <sys/statfs.h>
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100 # define STAT_STATFS2_BSIZE 1
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101
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102 static int
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103 statvfs_works (void)
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104 {
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105 static int statvfs_works_cache = -1;
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106 struct utsname name;
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107 if (statvfs_works_cache < 0)
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108 statvfs_works_cache = (uname (&name) == 0
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109 && 0 <= strverscmp (name.release, "2.6.36"));
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110 return statvfs_works_cache;
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111 }
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112 # endif
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113 #endif
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114
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115
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116 /* Fill in the fields of FSP with information about space usage for
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117 the file system on which FILE resides.
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118 DISK is the device on which FILE is mounted, for space-getting
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119 methods that need to know it.
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120 Return 0 if successful, -1 if not. When returning -1, ensure that
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121 ERRNO is either a system error value, or zero if DISK is NULL
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122 on a system that requires a non-NULL value. */
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123 int
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124 get_fs_usage (char const *file, char const *disk, struct fs_usage *fsp)
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125 {
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126 #ifdef STAT_STATVFS /* POSIX, except pre-2.6.36 glibc/Linux */
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127
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128 if (statvfs_works ())
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129 {
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130 struct statvfs vfsd;
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131
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132 if (statvfs (file, &vfsd) < 0)
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133 return -1;
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134
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diff changeset
135 /* f_frsize isn't guaranteed to be supported. */
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136 fsp->fsu_blocksize = (vfsd.f_frsize
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137 ? PROPAGATE_ALL_ONES (vfsd.f_frsize)
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parents: 16201
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138 : PROPAGATE_ALL_ONES (vfsd.f_bsize));
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139
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diff changeset
140 fsp->fsu_blocks = PROPAGATE_ALL_ONES (vfsd.f_blocks);
53fb1ea35cc9 fsusage: check for GNU/Linux statvfs problem dynamically
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diff changeset
141 fsp->fsu_bfree = PROPAGATE_ALL_ONES (vfsd.f_bfree);
53fb1ea35cc9 fsusage: check for GNU/Linux statvfs problem dynamically
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diff changeset
142 fsp->fsu_bavail = PROPAGATE_TOP_BIT (vfsd.f_bavail);
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143 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (vfsd.f_bavail) != 0;
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144 fsp->fsu_files = PROPAGATE_ALL_ONES (vfsd.f_files);
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diff changeset
145 fsp->fsu_ffree = PROPAGATE_ALL_ONES (vfsd.f_ffree);
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146 return 0;
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parents: 16201
diff changeset
147 }
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148
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diff changeset
149 #endif
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150
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diff changeset
151 #if defined STAT_STATVFS64 /* AIX */
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152
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153 struct statvfs64 fsd;
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154
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155 if (statvfs64 (file, &fsd) < 0)
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156 return -1;
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157
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diff changeset
158 /* f_frsize isn't guaranteed to be supported. */
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159 fsp->fsu_blocksize = (fsd.f_frsize
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160 ? PROPAGATE_ALL_ONES (fsd.f_frsize)
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161 : PROPAGATE_ALL_ONES (fsd.f_bsize));
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162
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163 #elif defined STAT_STATFS2_FS_DATA /* Ultrix */
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164
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165 struct fs_data fsd;
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166
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167 if (statfs (file, &fsd) != 1)
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168 return -1;
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169
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170 fsp->fsu_blocksize = 1024;
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171 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
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172 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
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173 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
e7fef68c6d85 Include <limits.h>.
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174 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
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diff changeset
175 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
5f2881266806 (PROPAGATE_ALL_ONES): New macro.
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176 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
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177
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178 #elif defined STAT_READ_FILSYS /* SVR2 */
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179 # ifndef SUPERBOFF
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180 # define SUPERBOFF (SUPERB * 512)
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181 # endif
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182
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183 struct filsys fsd;
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184 int fd;
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185
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186 if (! disk)
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diff changeset
187 {
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188 errno = 0;
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189 return -1;
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190 }
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191
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192 fd = open (disk, O_RDONLY);
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193 if (fd < 0)
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194 return -1;
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195 lseek (fd, (off_t) SUPERBOFF, 0);
4087
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196 if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
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197 {
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198 close (fd);
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199 return -1;
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200 }
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201 close (fd);
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202
1202
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203 fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
1201
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diff changeset
204 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
5f2881266806 (PROPAGATE_ALL_ONES): New macro.
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diff changeset
205 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
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diff changeset
206 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
e7fef68c6d85 Include <limits.h>.
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diff changeset
207 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
1201
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diff changeset
208 fsp->fsu_files = (fsd.s_isize == -1
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209 ? UINTMAX_MAX
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210 : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
1201
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diff changeset
211 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
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212
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diff changeset
213 #elif defined STAT_STATFS3_OSF1 /* OSF/1 */
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diff changeset
214
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diff changeset
215 struct statfs fsd;
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diff changeset
216
6912
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parents: 6275
diff changeset
217 if (statfs (file, &fsd, sizeof (struct statfs)) != 0)
314715e0260d Merge from coreutils.
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parents: 6275
diff changeset
218 return -1;
314715e0260d Merge from coreutils.
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parents: 6275
diff changeset
219
314715e0260d Merge from coreutils.
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parents: 6275
diff changeset
220 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
314715e0260d Merge from coreutils.
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parents: 6275
diff changeset
221
16857
62fe7a186f63 fsusage: fix block size returned on older Linux 2.6
Pádraig Brady <P@draigBrady.com>
parents: 16847
diff changeset
222 #elif defined STAT_STATFS2_FRSIZE /* 2.6 < glibc/Linux < 2.6.36 */
62fe7a186f63 fsusage: fix block size returned on older Linux 2.6
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diff changeset
223
62fe7a186f63 fsusage: fix block size returned on older Linux 2.6
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parents: 16847
diff changeset
224 struct statfs fsd;
62fe7a186f63 fsusage: fix block size returned on older Linux 2.6
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parents: 16847
diff changeset
225
62fe7a186f63 fsusage: fix block size returned on older Linux 2.6
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parents: 16847
diff changeset
226 if (statfs (file, &fsd) < 0)
62fe7a186f63 fsusage: fix block size returned on older Linux 2.6
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parents: 16847
diff changeset
227 return -1;
62fe7a186f63 fsusage: fix block size returned on older Linux 2.6
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parents: 16847
diff changeset
228
62fe7a186f63 fsusage: fix block size returned on older Linux 2.6
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parents: 16847
diff changeset
229 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_frsize);
62fe7a186f63 fsusage: fix block size returned on older Linux 2.6
Pádraig Brady <P@draigBrady.com>
parents: 16847
diff changeset
230
62fe7a186f63 fsusage: fix block size returned on older Linux 2.6
Pádraig Brady <P@draigBrady.com>
parents: 16847
diff changeset
231 #elif defined STAT_STATFS2_BSIZE /* glibc/Linux < 2.6, 4.3BSD, SunOS 4, \
16935
498a2211d839 Write "Mac OS X" instead of "MacOS X".
Bruno Haible <bruno@clisp.org>
parents: 16857
diff changeset
232 Mac OS X < 10.4, FreeBSD < 5.0, \
13450
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parents: 12559
diff changeset
233 NetBSD < 3.0, OpenBSD < 4.4 */
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diff changeset
234
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diff changeset
235 struct statfs fsd;
41c9d08b09d7 Initial revision
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diff changeset
236
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parents: 5848
diff changeset
237 if (statfs (file, &fsd) < 0)
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parents:
diff changeset
238 return -1;
488
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
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parents: 439
diff changeset
239
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parents: 1135
diff changeset
240 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
1135
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diff changeset
241
774
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diff changeset
242 # ifdef STATFS_TRUNCATES_BLOCK_COUNTS
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diff changeset
243
488
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
Jim Meyering <jim@meyering.net>
parents: 439
diff changeset
244 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
Jim Meyering <jim@meyering.net>
parents: 439
diff changeset
245 struct statfs are truncated to 2GB. These conditions detect that
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
Jim Meyering <jim@meyering.net>
parents: 439
diff changeset
246 truncation, presumably without botching the 4.1.1 case, in which
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
Jim Meyering <jim@meyering.net>
parents: 439
diff changeset
247 the values are not truncated. The correct counts are stored in
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
Jim Meyering <jim@meyering.net>
parents: 439
diff changeset
248 undocumented spare fields. */
1876
663e86d5d38c (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]:
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parents: 1557
diff changeset
249 if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
488
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
Jim Meyering <jim@meyering.net>
parents: 439
diff changeset
250 {
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
Jim Meyering <jim@meyering.net>
parents: 439
diff changeset
251 fsd.f_blocks = fsd.f_spare[0];
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
Jim Meyering <jim@meyering.net>
parents: 439
diff changeset
252 fsd.f_bfree = fsd.f_spare[1];
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
Jim Meyering <jim@meyering.net>
parents: 439
diff changeset
253 fsd.f_bavail = fsd.f_spare[2];
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
Jim Meyering <jim@meyering.net>
parents: 439
diff changeset
254 }
774
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parents: 670
diff changeset
255 # endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
488
3b80433a4e28 (get_fs_usage) [STATFS_TRUNCATES_BLOCK_COUNTS]: Copy untruncated block
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parents: 439
diff changeset
256
13450
0394cf0c5bad fsusage: Clarify which code applies to which platforms.
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parents: 12559
diff changeset
257 #elif defined STAT_STATFS2_FSIZE /* 4.4BSD and older NetBSD */
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diff changeset
258
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diff changeset
259 struct statfs fsd;
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diff changeset
260
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parents: 5848
diff changeset
261 if (statfs (file, &fsd) < 0)
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parents:
diff changeset
262 return -1;
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diff changeset
263
1201
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parents: 1135
diff changeset
264 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
1135
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265
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266 #elif defined STAT_STATFS4 /* SVR3, Dynix, old Irix, old AIX, \
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267 Dolphin */
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268
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269 # if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
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270 # define f_bavail f_bfree
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271 # endif
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272
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273 struct statfs fsd;
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274
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275 if (statfs (file, &fsd, sizeof fsd, 0) < 0)
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276 return -1;
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277
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278 /* Empirically, the block counts on most SVR3 and SVR3-derived
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279 systems seem to always be in terms of 512-byte blocks,
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280 no matter what value f_bsize has. */
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281 # if _AIX || defined _CRAY
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282 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
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283 # else
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284 fsp->fsu_blocksize = 512;
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285 # endif
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286
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287 #endif
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288
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289 #if (defined STAT_STATVFS64 || defined STAT_STATFS3_OSF1 \
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290 || defined STAT_STATFS2_FRSIZE || defined STAT_STATFS2_BSIZE \
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291 || defined STAT_STATFS2_FSIZE || defined STAT_STATFS4)
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292
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293 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
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294 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
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295 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
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296 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
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297 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
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298 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
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299
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300 #endif
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301
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302 (void) disk; /* avoid argument-unused warning */
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303 return 0;
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304 }
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305
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306 #if defined _AIX && defined _I386
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307 /* AIX PS/2 does not supply statfs. */
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308
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309 int
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310 statfs (char *file, struct statfs *fsb)
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311 {
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312 struct stat stats;
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313 struct dustat fsd;
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314
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315 if (stat (file, &stats) != 0)
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316 return -1;
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317 if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
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318 return -1;
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319 fsb->f_type = 0;
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320 fsb->f_bsize = fsd.du_bsize;
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321 fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
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322 fsb->f_bfree = fsd.du_tfree;
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323 fsb->f_bavail = fsd.du_tfree;
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324 fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
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325 fsb->f_ffree = fsd.du_tinode;
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326 fsb->f_fsid.val[0] = fsd.du_site;
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327 fsb->f_fsid.val[1] = fsd.du_pckno;
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328 return 0;
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329 }
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330
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331 #endif /* _AIX && _I386 */