summaryrefslogtreecommitdiffstats
path: root/lib/fsusage.c
blob: b13779073cd2060d0a257d7a34889bbe1b58be81 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
/* fsusage.c -- return space usage of mounted file systems

   Copyright (C) 1991, 1992, 1996, 1998, 1999, 2002, 2003, 2004, 2005
   Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#if HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#if HAVE_STDINT_H
# include <stdint.h>
#endif
#include <unistd.h>
#ifndef UINTMAX_MAX
# define UINTMAX_MAX ((uintmax_t) -1)
#endif

#include <sys/types.h>
#include <sys/stat.h>
#include "fsusage.h"

#include <limits.h>

#if HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif

#if HAVE_SYS_MOUNT_H
# include <sys/mount.h>
#endif

#if HAVE_SYS_VFS_H
# include <sys/vfs.h>
#endif

#if HAVE_SYS_FS_S5PARAM_H	/* Fujitsu UXP/V */
# include <sys/fs/s5param.h>
#endif

#if defined HAVE_SYS_FILSYS_H && !defined _CRAY
# include <sys/filsys.h>	/* SVR2 */
#endif

#include <fcntl.h>

#if HAVE_SYS_STATFS_H
# include <sys/statfs.h>
#endif

#if HAVE_DUSTAT_H		/* AIX PS/2 */
# include <sys/dustat.h>
#endif

#if HAVE_SYS_STATVFS_H		/* SVR4 */
# include <sys/statvfs.h>
#endif

#include "full-read.h"

/* Many space usage primitives use all 1 bits to denote a value that is
   not applicable or unknown.  Propagate this information by returning
   a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
   is unsigned and narrower than uintmax_t.  */
#define PROPAGATE_ALL_ONES(x) \
  ((sizeof (x) < sizeof (uintmax_t) \
    && (~ (x) == (sizeof (x) < sizeof (int) \
		  ? - (1 << (sizeof (x) * CHAR_BIT)) \
		  : 0))) \
   ? UINTMAX_MAX : (x))

/* Extract the top bit of X as an uintmax_t value.  */
#define EXTRACT_TOP_BIT(x) ((x) \
			    & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))

/* If a value is negative, many space usage primitives store it into an
   integer variable by assignment, even if the variable's type is unsigned.
   So, if a space usage variable X's top bit is set, convert X to the
   uintmax_t value V such that (- (uintmax_t) V) is the negative of
   the original value.  If X's top bit is clear, just yield X.
   Use PROPAGATE_TOP_BIT if the original value might be negative;
   otherwise, use PROPAGATE_ALL_ONES.  */
#define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))

/* Fill in the fields of FSP with information about space usage for
   the file system on which FILE resides.
   DISK is the device on which FILE is mounted, for space-getting
   methods that need to know it.
   Return 0 if successful, -1 if not.  When returning -1, ensure that
   ERRNO is either a system error value, or zero if DISK is NULL
   on a system that requires a non-NULL value.  */
int
get_fs_usage (char const *file, char const *disk, struct fs_usage *fsp)
{
#ifdef STAT_STATFS3_OSF1

  struct statfs fsd;

  if (statfs (file, &fsd, sizeof (struct statfs)) != 0)
    return -1;

  fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);

#endif /* STAT_STATFS3_OSF1 */

#ifdef STAT_STATFS2_FS_DATA	/* Ultrix */

  struct fs_data fsd;

  if (statfs (file, &fsd) != 1)
    return -1;

  fsp->fsu_blocksize = 1024;
  fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
  fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
  fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
  fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
  fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
  fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);

#endif /* STAT_STATFS2_FS_DATA */

#ifdef STAT_READ_FILSYS		/* SVR2 */
# ifndef SUPERBOFF
#  define SUPERBOFF (SUPERB * 512)
# endif

  struct filsys fsd;
  int fd;

  if (! disk)
    {
      errno = 0;
      return -1;
    }

  fd = open (disk, O_RDONLY);
  if (fd < 0)
    return -1;
  lseek (fd, (off_t) SUPERBOFF, 0);
  if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
    {
      close (fd);
      return -1;
    }
  close (fd);

  fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
  fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
  fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
  fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
  fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
  fsp->fsu_files = (fsd.s_isize == -1
		    ? UINTMAX_MAX
		    : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
  fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);

#endif /* STAT_READ_FILSYS */

#ifdef STAT_STATFS2_BSIZE	/* 4.3BSD, SunOS 4, HP-UX, AIX */

  struct statfs fsd;

  if (statfs (file, &fsd) < 0)
    return -1;

  fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);

# ifdef STATFS_TRUNCATES_BLOCK_COUNTS

  /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
     struct statfs are truncated to 2GB.  These conditions detect that
     truncation, presumably without botching the 4.1.1 case, in which
     the values are not truncated.  The correct counts are stored in
     undocumented spare fields.  */
  if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
    {
      fsd.f_blocks = fsd.f_spare[0];
      fsd.f_bfree = fsd.f_spare[1];
      fsd.f_bavail = fsd.f_spare[2];
    }
# endif /* STATFS_TRUNCATES_BLOCK_COUNTS */

#endif /* STAT_STATFS2_BSIZE */

#ifdef STAT_STATFS2_FSIZE	/* 4.4BSD */

  struct statfs fsd;

  if (statfs (file, &fsd) < 0)
    return -1;

  fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);

#endif /* STAT_STATFS2_FSIZE */

#ifdef STAT_STATFS4		/* SVR3, Dynix, Irix, AIX */

# if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
#  define f_bavail f_bfree
# endif

  struct statfs fsd;

  if (statfs (file, &fsd, sizeof fsd, 0) < 0)
    return -1;

  /* Empirically, the block counts on most SVR3 and SVR3-derived
     systems seem to always be in terms of 512-byte blocks,
     no matter what value f_bsize has.  */
# if _AIX || defined _CRAY
   fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
# else
   fsp->fsu_blocksize = 512;
# endif

#endif /* STAT_STATFS4 */

#ifdef STAT_STATVFS		/* SVR4 */

  struct statvfs fsd;

  if (statvfs (file, &fsd) < 0)
    return -1;

  /* f_frsize isn't guaranteed to be supported.  */
  fsp->fsu_blocksize = (fsd.f_frsize
			? PROPAGATE_ALL_ONES (fsd.f_frsize)
			: PROPAGATE_ALL_ONES (fsd.f_bsize));

#endif /* STAT_STATVFS */

#if !defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS
				/* !Ultrix && !SVR2 */

  fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
  fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
  fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
  fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
  fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
  fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);

#endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */

  return 0;
}

#if defined _AIX && defined _I386
/* AIX PS/2 does not supply statfs.  */

int
statfs (char *file, struct statfs *fsb)
{
  struct stat stats;
  struct dustat fsd;

  if (stat (file, &stats) != 0)
    return -1;
  if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
    return -1;
  fsb->f_type   = 0;
  fsb->f_bsize  = fsd.du_bsize;
  fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
  fsb->f_bfree  = fsd.du_tfree;
  fsb->f_bavail = fsd.du_tfree;
  fsb->f_files  = (fsd.du_isize - 2) * fsd.du_inopb;
  fsb->f_ffree  = fsd.du_tinode;
  fsb->f_fsid.val[0] = fsd.du_site;
  fsb->f_fsid.val[1] = fsd.du_pckno;
  return 0;
}

#endif /* _AIX && _I386 */