1 /* fsusage.c -- return space usage of mounted file systems
3 Copyright (C) 1991, 1992, 1996, 1998, 1999, 2002, 2003, 2004, 2005
4 Free Software Foundation, Inc.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
25 # include <inttypes.h>
32 # define UINTMAX_MAX ((uintmax_t) -1)
35 #include <sys/types.h>
42 # include <sys/param.h>
46 # include <sys/mount.h>
53 #if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
54 # include <sys/fs/s5param.h>
57 #if defined HAVE_SYS_FILSYS_H && !defined _CRAY
58 # include <sys/filsys.h> /* SVR2 */
64 # include <sys/statfs.h>
67 #if HAVE_DUSTAT_H /* AIX PS/2 */
68 # include <sys/dustat.h>
71 #if HAVE_SYS_STATVFS_H /* SVR4 */
72 # include <sys/statvfs.h>
75 #include "full-read.h"
77 /* Many space usage primitives use all 1 bits to denote a value that is
78 not applicable or unknown. Propagate this information by returning
79 a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
80 is unsigned and narrower than uintmax_t. */
81 #define PROPAGATE_ALL_ONES(x) \
82 ((sizeof (x) < sizeof (uintmax_t) \
83 && (~ (x) == (sizeof (x) < sizeof (int) \
84 ? - (1 << (sizeof (x) * CHAR_BIT)) \
88 /* Extract the top bit of X as an uintmax_t value. */
89 #define EXTRACT_TOP_BIT(x) ((x) \
90 & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
92 /* If a value is negative, many space usage primitives store it into an
93 integer variable by assignment, even if the variable's type is unsigned.
94 So, if a space usage variable X's top bit is set, convert X to the
95 uintmax_t value V such that (- (uintmax_t) V) is the negative of
96 the original value. If X's top bit is clear, just yield X.
97 Use PROPAGATE_TOP_BIT if the original value might be negative;
98 otherwise, use PROPAGATE_ALL_ONES. */
99 #define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
101 /* Fill in the fields of FSP with information about space usage for
102 the file system on which FILE resides.
103 DISK is the device on which FILE is mounted, for space-getting
104 methods that need to know it.
105 Return 0 if successful, -1 if not. When returning -1, ensure that
106 ERRNO is either a system error value, or zero if DISK is NULL
107 on a system that requires a non-NULL value. */
109 get_fs_usage (char const *file, char const *disk, struct fs_usage *fsp)
111 #ifdef STAT_STATFS3_OSF1
115 if (statfs (file, &fsd, sizeof (struct statfs)) != 0)
118 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
120 #endif /* STAT_STATFS3_OSF1 */
122 #ifdef STAT_STATFS2_FS_DATA /* Ultrix */
126 if (statfs (file, &fsd) != 1)
129 fsp->fsu_blocksize = 1024;
130 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
131 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
132 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
133 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
134 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
135 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
137 #endif /* STAT_STATFS2_FS_DATA */
139 #ifdef STAT_READ_FILSYS /* SVR2 */
141 # define SUPERBOFF (SUPERB * 512)
153 fd = open (disk, O_RDONLY);
156 lseek (fd, (off_t) SUPERBOFF, 0);
157 if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
164 fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
165 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
166 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
167 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
168 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
169 fsp->fsu_files = (fsd.s_isize == -1
171 : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
172 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
174 #endif /* STAT_READ_FILSYS */
176 #ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
180 if (statfs (file, &fsd) < 0)
183 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
185 # ifdef STATFS_TRUNCATES_BLOCK_COUNTS
187 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
188 struct statfs are truncated to 2GB. These conditions detect that
189 truncation, presumably without botching the 4.1.1 case, in which
190 the values are not truncated. The correct counts are stored in
191 undocumented spare fields. */
192 if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
194 fsd.f_blocks = fsd.f_spare[0];
195 fsd.f_bfree = fsd.f_spare[1];
196 fsd.f_bavail = fsd.f_spare[2];
198 # endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
200 #endif /* STAT_STATFS2_BSIZE */
202 #ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
206 if (statfs (file, &fsd) < 0)
209 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
211 #endif /* STAT_STATFS2_FSIZE */
213 #ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
215 # if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
216 # define f_bavail f_bfree
221 if (statfs (file, &fsd, sizeof fsd, 0) < 0)
224 /* Empirically, the block counts on most SVR3 and SVR3-derived
225 systems seem to always be in terms of 512-byte blocks,
226 no matter what value f_bsize has. */
227 # if _AIX || defined _CRAY
228 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
230 fsp->fsu_blocksize = 512;
233 #endif /* STAT_STATFS4 */
235 #ifdef STAT_STATVFS /* SVR4 */
239 if (statvfs (file, &fsd) < 0)
242 /* f_frsize isn't guaranteed to be supported. */
243 fsp->fsu_blocksize = (fsd.f_frsize
244 ? PROPAGATE_ALL_ONES (fsd.f_frsize)
245 : PROPAGATE_ALL_ONES (fsd.f_bsize));
247 #endif /* STAT_STATVFS */
249 #if !defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS
250 /* !Ultrix && !SVR2 */
252 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
253 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
254 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
255 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
256 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
257 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
259 #endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
264 #if defined _AIX && defined _I386
265 /* AIX PS/2 does not supply statfs. */
268 statfs (char *file, struct statfs *fsb)
273 if (stat (file, &stats) != 0)
275 if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
278 fsb->f_bsize = fsd.du_bsize;
279 fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
280 fsb->f_bfree = fsd.du_tfree;
281 fsb->f_bavail = fsd.du_tfree;
282 fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
283 fsb->f_ffree = fsd.du_tinode;
284 fsb->f_fsid.val[0] = fsd.du_site;
285 fsb->f_fsid.val[1] = fsd.du_pckno;
289 #endif /* _AIX && _I386 */