1 /* fsusage.c -- return space usage of mounted filesystems
2 Copyright (C) 1991, 1992, 1996, 1998, 1999 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>
30 # define UINTMAX_MAX ((uintmax_t) -1)
33 #include <sys/types.h>
47 # include <sys/param.h>
51 # include <sys/mount.h>
58 #if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
59 # include <sys/fs/s5param.h>
62 #if defined (HAVE_SYS_FILSYS_H) && !defined (_CRAY)
63 # include <sys/filsys.h> /* SVR2 */
71 # include <sys/statfs.h>
74 #if HAVE_DUSTAT_H /* AIX PS/2 */
75 # include <sys/dustat.h>
78 #if HAVE_SYS_STATVFS_H /* SVR4 */
79 # include <sys/statvfs.h>
83 /* Many space usage primitives use all 1 bits to denote a value that is
84 not applicable or unknown. Propagate this information by returning
85 a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
86 is unsigned and narrower than uintmax_t. */
87 #define PROPAGATE_ALL_ONES(x) \
88 ((sizeof (x) < sizeof (uintmax_t) \
89 && (~ (x) == (sizeof (x) < sizeof (int) \
90 ? - (1 << (sizeof (x) * CHAR_BIT)) \
94 /* Extract the top bit of X as an uintmax_t value. */
95 #define EXTRACT_TOP_BIT(x) ((x) \
96 & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
98 /* If a value is negative, many space usage primitives store it into an
99 integer variable by assignment, even if the variable's type is unsigned.
100 So, if a space usage variable X's top bit is set, convert X to the
101 uintmax_t value V such that (- (uintmax_t) V) is the negative of
102 the original value. If X's top bit is clear, just yield X.
103 Use PROPAGATE_TOP_BIT if the original value might be negative;
104 otherwise, use PROPAGATE_ALL_ONES. */
105 #define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
109 /* Fill in the fields of FSP with information about space usage for
110 the filesystem on which PATH resides.
111 DISK is the device on which PATH is mounted, for space-getting
112 methods that need to know it.
113 Return 0 if successful, -1 if not. When returning -1, ensure that
114 ERRNO is either a system error value, or zero if DISK is NULL
115 on a system that requires a non-NULL value. */
117 get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp)
119 #ifdef STAT_STATFS3_OSF1
123 if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
126 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
128 #endif /* STAT_STATFS3_OSF1 */
130 #ifdef STAT_STATFS2_FS_DATA /* Ultrix */
134 if (statfs (path, &fsd) != 1)
137 fsp->fsu_blocksize = 1024;
138 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
139 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
140 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
141 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
142 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
143 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
145 #endif /* STAT_STATFS2_FS_DATA */
147 #ifdef STAT_READ_FILSYS /* SVR2 */
149 # define SUPERBOFF (SUPERB * 512)
161 fd = open (disk, O_RDONLY);
164 lseek (fd, (off_t) SUPERBOFF, 0);
165 if (safe_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
172 fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
173 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
174 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
175 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
176 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
177 fsp->fsu_files = (fsd.s_isize == -1
179 : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
180 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
182 #endif /* STAT_READ_FILSYS */
184 #ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
188 if (statfs (path, &fsd) < 0)
191 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
193 # ifdef STATFS_TRUNCATES_BLOCK_COUNTS
195 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
196 struct statfs are truncated to 2GB. These conditions detect that
197 truncation, presumably without botching the 4.1.1 case, in which
198 the values are not truncated. The correct counts are stored in
199 undocumented spare fields. */
200 if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
202 fsd.f_blocks = fsd.f_spare[0];
203 fsd.f_bfree = fsd.f_spare[1];
204 fsd.f_bavail = fsd.f_spare[2];
206 # endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
208 #endif /* STAT_STATFS2_BSIZE */
210 #ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
214 if (statfs (path, &fsd) < 0)
217 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
219 #endif /* STAT_STATFS2_FSIZE */
221 #ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
223 # if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
224 # define f_bavail f_bfree
229 if (statfs (path, &fsd, sizeof fsd, 0) < 0)
232 /* Empirically, the block counts on most SVR3 and SVR3-derived
233 systems seem to always be in terms of 512-byte blocks,
234 no matter what value f_bsize has. */
235 # if _AIX || defined(_CRAY)
236 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
238 fsp->fsu_blocksize = 512;
241 #endif /* STAT_STATFS4 */
243 #ifdef STAT_STATVFS /* SVR4 */
247 if (statvfs (path, &fsd) < 0)
250 /* f_frsize isn't guaranteed to be supported. */
251 fsp->fsu_blocksize = (fsd.f_frsize
252 ? PROPAGATE_ALL_ONES (fsd.f_frsize)
253 : PROPAGATE_ALL_ONES (fsd.f_bsize));
255 #endif /* STAT_STATVFS */
257 #if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ_FILSYS)
258 /* !Ultrix && !SVR2 */
260 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
261 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
262 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
263 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
264 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
265 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
267 #endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
272 #if defined(_AIX) && defined(_I386)
273 /* AIX PS/2 does not supply statfs. */
276 statfs (char *path, struct statfs *fsb)
281 if (stat (path, &stats))
283 if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
286 fsb->f_bsize = fsd.du_bsize;
287 fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
288 fsb->f_bfree = fsd.du_tfree;
289 fsb->f_bavail = fsd.du_tfree;
290 fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
291 fsb->f_ffree = fsd.du_tinode;
292 fsb->f_fsid.val[0] = fsd.du_site;
293 fsb->f_fsid.val[1] = fsd.du_pckno;
297 #endif /* _AIX && _I386 */