1 /* fsusage.c -- return space usage of mounted filesystems
2 Copyright (C) 1991, 1992, 1996, 1998 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
23 # include <inttypes.h>
25 #include <sys/types.h>
39 # include <sys/param.h>
43 # include <sys/mount.h>
50 #if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
51 # include <sys/fs/s5param.h>
54 #if defined (HAVE_SYS_FILSYS_H) && !defined (_CRAY)
55 # include <sys/filsys.h> /* SVR2 */
63 # include <sys/statfs.h>
66 #if HAVE_DUSTAT_H /* AIX PS/2 */
67 # include <sys/dustat.h>
70 #if HAVE_SYS_STATVFS_H /* SVR4 */
71 # include <sys/statvfs.h>
75 /* Many space usage primitives use all 1 bits to denote a value that is
76 not applicable or unknown. Propagate this information by returning
77 a uintmax_t value that is all 1 bits if the argument is all 1 bits,
78 even if the argument is unsigned and smaller than uintmax_t. */
79 #define PROPAGATE_ALL_ONES(x) ((x) == -1 ? (uintmax_t) -1 : (uintmax_t) (x))
81 /* Extract the top bit of X as an uintmax_t value. */
82 #define EXTRACT_TOP_BIT(x) ((x) \
83 & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
85 /* If a value is negative, many space usage primitives store it into an
86 integer variable by assignment, even if the variable's type is unsigned.
87 So, if a space usage variable X's top bit is set, convert X to the
88 uintmax_t value V such that (- (uintmax_t) V) is the negative of
89 the original value. If X's top bit is clear, just yield X.
90 Use PROPAGATE_TOP_BIT if the original value might be negative;
91 otherwise, use PROPAGATE_ALL_ONES. */
92 #define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
96 /* Fill in the fields of FSP with information about space usage for
97 the filesystem on which PATH resides.
98 DISK is the device on which PATH is mounted, for space-getting
99 methods that need to know it.
100 Return 0 if successful, -1 if not. When returning -1, ensure that
101 ERRNO is either a system error value, or zero if DISK is NULL
102 on a system that requires a non-NULL value. */
104 get_fs_usage (path, disk, fsp)
107 struct fs_usage *fsp;
109 #ifdef STAT_STATFS3_OSF1
113 if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
116 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
118 #endif /* STAT_STATFS3_OSF1 */
120 #ifdef STAT_STATFS2_FS_DATA /* Ultrix */
124 if (statfs (path, &fsd) != 1)
127 fsp->fsu_blocksize = 1024;
128 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
129 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
130 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
131 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
132 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
133 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
135 #endif /* STAT_STATFS2_FS_DATA */
137 #ifdef STAT_READ_FILSYS /* SVR2 */
139 # define SUPERBOFF (SUPERB * 512)
151 fd = open (disk, O_RDONLY);
154 lseek (fd, (off_t) SUPERBOFF, 0);
155 if (safe_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
162 fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
163 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
164 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
165 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
166 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
167 fsp->fsu_files = (fsd.s_isize == -1
169 : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
170 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
172 #endif /* STAT_READ_FILSYS */
174 #ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
178 if (statfs (path, &fsd) < 0)
181 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
183 # ifdef STATFS_TRUNCATES_BLOCK_COUNTS
185 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
186 struct statfs are truncated to 2GB. These conditions detect that
187 truncation, presumably without botching the 4.1.1 case, in which
188 the values are not truncated. The correct counts are stored in
189 undocumented spare fields. */
190 if (fsd.f_blocks == 0x1fffff && fsd.f_spare[0] > 0)
192 fsd.f_blocks = fsd.f_spare[0];
193 fsd.f_bfree = fsd.f_spare[1];
194 fsd.f_bavail = fsd.f_spare[2];
196 # endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
198 #endif /* STAT_STATFS2_BSIZE */
200 #ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
204 if (statfs (path, &fsd) < 0)
207 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
209 #endif /* STAT_STATFS2_FSIZE */
211 #ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
213 # if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
214 # define f_bavail f_bfree
219 if (statfs (path, &fsd, sizeof fsd, 0) < 0)
222 /* Empirically, the block counts on most SVR3 and SVR3-derived
223 systems seem to always be in terms of 512-byte blocks,
224 no matter what value f_bsize has. */
225 # if _AIX || defined(_CRAY)
226 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
228 fsp->fsu_blocksize = 512;
231 #endif /* STAT_STATFS4 */
233 #ifdef STAT_STATVFS /* SVR4 */
237 if (statvfs (path, &fsd) < 0)
240 /* f_frsize isn't guaranteed to be supported. */
242 PROPAGATE_ALL_ONES (fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize);
244 #endif /* STAT_STATVFS */
246 #if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ_FILSYS)
247 /* !Ultrix && !SVR2 */
249 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
250 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
251 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
252 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
253 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
254 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
256 #endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
261 #if defined(_AIX) && defined(_I386)
262 /* AIX PS/2 does not supply statfs. */
272 if (stat (path, &stats))
274 if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
277 fsb->f_bsize = fsd.du_bsize;
278 fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
279 fsb->f_bfree = fsd.du_tfree;
280 fsb->f_bavail = fsd.du_tfree;
281 fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
282 fsb->f_ffree = fsd.du_tinode;
283 fsb->f_fsid.val[0] = fsd.du_site;
284 fsb->f_fsid.val[1] = fsd.du_pckno;
288 #endif /* _AIX && _I386 */