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annotate lib/fsusage.c @ 5848:a48fb0e98c8c

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*** empty log message ***
author Paul Eggert <eggert@cs.ucla.edu>
date Sat, 14 May 2005 06:03:57 +0000
parents b3d5c90efc81
children c47674a83a78
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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, 2003, 2004 Free
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4 Software Foundation, Inc.
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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 2, or (at your option)
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9 any later version.
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10
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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, write to the Free Software Foundation,
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18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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19
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20 #if HAVE_CONFIG_H
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21 # include <config.h>
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22 #endif
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23
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24 #if HAVE_INTTYPES_H
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25 # include <inttypes.h>
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26 #endif
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27 #if HAVE_STDINT_H
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28 # include <stdint.h>
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29 #endif
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30 #if HAVE_UNISTD_H
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31 # include <unistd.h>
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32 #endif
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33 #ifndef UINTMAX_MAX
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34 # define UINTMAX_MAX ((uintmax_t) -1)
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35 #endif
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36
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37 #include <sys/types.h>
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38 #include <sys/stat.h>
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39 #include "fsusage.h"
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40
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41 #include <limits.h>
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42
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43 #if HAVE_SYS_PARAM_H
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44 # include <sys/param.h>
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45 #endif
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46
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47 #if HAVE_SYS_MOUNT_H
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48 # include <sys/mount.h>
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49 #endif
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50
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51 #if HAVE_SYS_VFS_H
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52 # include <sys/vfs.h>
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53 #endif
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54
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55 #if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
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56 # include <sys/fs/s5param.h>
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57 #endif
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58
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59 #if defined HAVE_SYS_FILSYS_H && !defined _CRAY
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60 # include <sys/filsys.h> /* SVR2 */
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61 #endif
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62
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63 #if HAVE_FCNTL_H
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64 # include <fcntl.h>
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65 #endif
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66
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67 #if HAVE_SYS_STATFS_H
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68 # include <sys/statfs.h>
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69 #endif
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71 #if HAVE_DUSTAT_H /* AIX PS/2 */
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72 # include <sys/dustat.h>
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73 #endif
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75 #if HAVE_SYS_STATVFS_H /* SVR4 */
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76 # include <sys/statvfs.h>
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77 #endif
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78
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79 #include "full-read.h"
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81 /* Many space usage primitives use all 1 bits to denote a value that is
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82 not applicable or unknown. Propagate this information by returning
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83 a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
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84 is unsigned and narrower than uintmax_t. */
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85 #define PROPAGATE_ALL_ONES(x) \
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86 ((sizeof (x) < sizeof (uintmax_t) \
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87 && (~ (x) == (sizeof (x) < sizeof (int) \
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88 ? - (1 << (sizeof (x) * CHAR_BIT)) \
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89 : 0))) \
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90 ? UINTMAX_MAX : (x))
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91
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92 /* Extract the top bit of X as an uintmax_t value. */
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93 #define EXTRACT_TOP_BIT(x) ((x) \
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94 & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
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95
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96 /* If a value is negative, many space usage primitives store it into an
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97 integer variable by assignment, even if the variable's type is unsigned.
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98 So, if a space usage variable X's top bit is set, convert X to the
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99 uintmax_t value V such that (- (uintmax_t) V) is the negative of
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100 the original value. If X's top bit is clear, just yield X.
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101 Use PROPAGATE_TOP_BIT if the original value might be negative;
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102 otherwise, use PROPAGATE_ALL_ONES. */
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103 #define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
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104
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105 /* Fill in the fields of FSP with information about space usage for
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106 the file system on which PATH resides.
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107 DISK is the device on which PATH is mounted, for space-getting
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108 methods that need to know it.
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109 Return 0 if successful, -1 if not. When returning -1, ensure that
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110 ERRNO is either a system error value, or zero if DISK is NULL
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111 on a system that requires a non-NULL value. */
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112 int
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113 get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp)
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114 {
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115 #ifdef STAT_STATFS3_OSF1
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116
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117 struct statfs fsd;
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118
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119 if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
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120 return -1;
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121
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122 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
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123
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124 #endif /* STAT_STATFS3_OSF1 */
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125
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126 #ifdef STAT_STATFS2_FS_DATA /* Ultrix */
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127
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128 struct fs_data fsd;
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129
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130 if (statfs (path, &fsd) != 1)
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131 return -1;
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132
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133 fsp->fsu_blocksize = 1024;
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134 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
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135 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
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136 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
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137 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
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138 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
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139 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
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140
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141 #endif /* STAT_STATFS2_FS_DATA */
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142
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143 #ifdef STAT_READ_FILSYS /* SVR2 */
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144 # ifndef SUPERBOFF
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145 # define SUPERBOFF (SUPERB * 512)
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146 # endif
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147
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148 struct filsys fsd;
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149 int fd;
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150
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151 if (! disk)
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152 {
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153 errno = 0;
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154 return -1;
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155 }
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156
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157 fd = open (disk, O_RDONLY);
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158 if (fd < 0)
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159 return -1;
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160 lseek (fd, (off_t) SUPERBOFF, 0);
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161 if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
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162 {
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163 close (fd);
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164 return -1;
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165 }
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166 close (fd);
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167
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168 fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
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169 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
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170 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
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171 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
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172 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
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173 fsp->fsu_files = (fsd.s_isize == -1
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174 ? UINTMAX_MAX
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175 : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
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176 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
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177
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178 #endif /* STAT_READ_FILSYS */
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179
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180 #ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
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181
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182 struct statfs fsd;
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183
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184 if (statfs (path, &fsd) < 0)
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185 return -1;
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186
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187 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
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188
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189 # ifdef STATFS_TRUNCATES_BLOCK_COUNTS
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190
488
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191 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
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192 struct statfs are truncated to 2GB. These conditions detect that
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193 truncation, presumably without botching the 4.1.1 case, in which
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194 the values are not truncated. The correct counts are stored in
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195 undocumented spare fields. */
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196 if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
488
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197 {
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198 fsd.f_blocks = fsd.f_spare[0];
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199 fsd.f_bfree = fsd.f_spare[1];
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200 fsd.f_bavail = fsd.f_spare[2];
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201 }
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202 # endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
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203
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204 #endif /* STAT_STATFS2_BSIZE */
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205
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206 #ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
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207
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208 struct statfs fsd;
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209
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210 if (statfs (path, &fsd) < 0)
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211 return -1;
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212
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213 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
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214
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215 #endif /* STAT_STATFS2_FSIZE */
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216
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217 #ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
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218
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219 # if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
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220 # define f_bavail f_bfree
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221 # endif
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222
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223 struct statfs fsd;
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224
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225 if (statfs (path, &fsd, sizeof fsd, 0) < 0)
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226 return -1;
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227
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228 /* Empirically, the block counts on most SVR3 and SVR3-derived
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229 systems seem to always be in terms of 512-byte blocks,
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230 no matter what value f_bsize has. */
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231 # if _AIX || defined _CRAY
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232 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
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233 # else
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234 fsp->fsu_blocksize = 512;
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235 # endif
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236
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237 #endif /* STAT_STATFS4 */
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238
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239 #ifdef STAT_STATVFS /* SVR4 */
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240
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241 struct statvfs fsd;
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242
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243 if (statvfs (path, &fsd) < 0)
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244 return -1;
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245
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246 /* f_frsize isn't guaranteed to be supported. */
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247 fsp->fsu_blocksize = (fsd.f_frsize
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248 ? PROPAGATE_ALL_ONES (fsd.f_frsize)
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249 : PROPAGATE_ALL_ONES (fsd.f_bsize));
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250
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251 #endif /* STAT_STATVFS */
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252
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253 #if !defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS
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254 /* !Ultrix && !SVR2 */
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255
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256 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
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257 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
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258 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
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259 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
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260 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
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261 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
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262
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263 #endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
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264
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265 return 0;
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266 }
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267
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268 #if defined _AIX && defined _I386
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269 /* AIX PS/2 does not supply statfs. */
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270
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271 int
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272 statfs (char *path, struct statfs *fsb)
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273 {
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274 struct stat stats;
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275 struct dustat fsd;
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276
426
defe7888e2f3 (statfs): Use stat, not safe_stat.
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diff changeset
277 if (stat (path, &stats))
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278 return -1;
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279 if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
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280 return -1;
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281 fsb->f_type = 0;
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282 fsb->f_bsize = fsd.du_bsize;
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283 fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
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284 fsb->f_bfree = fsd.du_tfree;
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285 fsb->f_bavail = fsd.du_tfree;
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286 fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
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287 fsb->f_ffree = fsd.du_tinode;
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288 fsb->f_fsid.val[0] = fsd.du_site;
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289 fsb->f_fsid.val[1] = fsd.du_pckno;
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290 return 0;
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291 }
780
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292
5
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293 #endif /* _AIX && _I386 */