1 /* fsusage.c -- return space usage of mounted file systems
3 Copyright (C) 1991-1992, 1996, 1998-1999, 2002-2006, 2008
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 3 of the License, or
9 (at your option) any later version.
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, see <http://www.gnu.org/licenses/>. */
24 #include <sys/types.h>
26 #if STAT_STATVFS /* POSIX 1003.1-2001 (and later) with XSI */
27 # include <sys/statvfs.h>
29 /* Don't include backward-compatibility files unless they're needed.
30 Eventually we'd like to remove all this cruft. */
33 # include <sys/stat.h>
35 # include <sys/param.h>
38 # include <sys/mount.h>
43 # if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
44 # include <sys/fs/s5param.h>
46 # if defined HAVE_SYS_FILSYS_H && !defined _CRAY
47 # include <sys/filsys.h> /* SVR2 */
49 # if HAVE_SYS_STATFS_H
50 # include <sys/statfs.h>
52 # if HAVE_DUSTAT_H /* AIX PS/2 */
53 # include <sys/dustat.h>
55 # include "full-read.h"
58 /* The results of open() in this file are not used with fchdir,
59 therefore save some unnecessary work in fchdir.c. */
63 /* Many space usage primitives use all 1 bits to denote a value that is
64 not applicable or unknown. Propagate this information by returning
65 a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
66 is unsigned and narrower than uintmax_t. */
67 #define PROPAGATE_ALL_ONES(x) \
68 ((sizeof (x) < sizeof (uintmax_t) \
69 && (~ (x) == (sizeof (x) < sizeof (int) \
70 ? - (1 << (sizeof (x) * CHAR_BIT)) \
72 ? UINTMAX_MAX : (uintmax_t) (x))
74 /* Extract the top bit of X as an uintmax_t value. */
75 #define EXTRACT_TOP_BIT(x) ((x) \
76 & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
78 /* If a value is negative, many space usage primitives store it into an
79 integer variable by assignment, even if the variable's type is unsigned.
80 So, if a space usage variable X's top bit is set, convert X to the
81 uintmax_t value V such that (- (uintmax_t) V) is the negative of
82 the original value. If X's top bit is clear, just yield X.
83 Use PROPAGATE_TOP_BIT if the original value might be negative;
84 otherwise, use PROPAGATE_ALL_ONES. */
85 #define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
87 #ifdef STAT_READ_FILSYS
88 # define UNUSED_PARAM /* empty */
90 # define UNUSED_PARAM _UNUSED_PARAMETER_
93 /* Fill in the fields of FSP with information about space usage for
94 the file system on which FILE resides.
95 DISK is the device on which FILE is mounted, for space-getting
96 methods that need to know it.
97 Return 0 if successful, -1 if not. When returning -1, ensure that
98 ERRNO is either a system error value, or zero if DISK is NULL
99 on a system that requires a non-NULL value. */
101 get_fs_usage (char const *file, char const *disk UNUSED_PARAM,
102 struct fs_usage *fsp)
104 #if defined STAT_STATVFS /* POSIX */
108 if (statvfs (file, &fsd) < 0)
111 /* f_frsize isn't guaranteed to be supported. */
112 fsp->fsu_blocksize = (fsd.f_frsize
113 ? PROPAGATE_ALL_ONES (fsd.f_frsize)
114 : PROPAGATE_ALL_ONES (fsd.f_bsize));
116 #elif defined STAT_STATFS2_FS_DATA /* Ultrix */
120 if (statfs (file, &fsd) != 1)
123 fsp->fsu_blocksize = 1024;
124 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
125 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
126 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
127 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
128 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
129 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
131 #elif defined STAT_READ_FILSYS /* SVR2 */
133 # define SUPERBOFF (SUPERB * 512)
145 fd = open (disk, O_RDONLY);
148 lseek (fd, (off_t) SUPERBOFF, 0);
149 if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
156 fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
157 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
158 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
159 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
160 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
161 fsp->fsu_files = (fsd.s_isize == -1
163 : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
164 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
166 #elif defined STAT_STATFS3_OSF1
170 if (statfs (file, &fsd, sizeof (struct statfs)) != 0)
173 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
175 #elif defined STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
179 if (statfs (file, &fsd) < 0)
182 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
184 # ifdef STATFS_TRUNCATES_BLOCK_COUNTS
186 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
187 struct statfs are truncated to 2GB. These conditions detect that
188 truncation, presumably without botching the 4.1.1 case, in which
189 the values are not truncated. The correct counts are stored in
190 undocumented spare fields. */
191 if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
193 fsd.f_blocks = fsd.f_spare[0];
194 fsd.f_bfree = fsd.f_spare[1];
195 fsd.f_bavail = fsd.f_spare[2];
197 # endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
199 #elif defined STAT_STATFS2_FSIZE /* 4.4BSD */
203 if (statfs (file, &fsd) < 0)
206 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
208 #elif defined STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
210 # if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
211 # define f_bavail f_bfree
216 if (statfs (file, &fsd, sizeof fsd, 0) < 0)
219 /* Empirically, the block counts on most SVR3 and SVR3-derived
220 systems seem to always be in terms of 512-byte blocks,
221 no matter what value f_bsize has. */
222 # if _AIX || defined _CRAY
223 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
225 fsp->fsu_blocksize = 512;
230 #if (defined STAT_STATVFS \
231 || (!defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS))
233 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
234 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
235 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
236 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
237 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
238 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
245 #if defined _AIX && defined _I386
246 /* AIX PS/2 does not supply statfs. */
249 statfs (char *file, struct statfs *fsb)
254 if (stat (file, &stats) != 0)
256 if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
259 fsb->f_bsize = fsd.du_bsize;
260 fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
261 fsb->f_bfree = fsd.du_tfree;
262 fsb->f_bavail = fsd.du_tfree;
263 fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
264 fsb->f_ffree = fsd.du_tinode;
265 fsb->f_fsid.val[0] = fsd.du_site;
266 fsb->f_fsid.val[1] = fsd.du_pckno;
270 #endif /* _AIX && _I386 */