1 /* fsusage.c -- return space usage of mounted file systems
3 Copyright (C) 1991-1992, 1996, 1998-1999, 2002-2006, 2009-2011 Free Software
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 /* Fill in the fields of FSP with information about space usage for
88 the file system on which FILE resides.
89 DISK is the device on which FILE is mounted, for space-getting
90 methods that need to know it.
91 Return 0 if successful, -1 if not. When returning -1, ensure that
92 ERRNO is either a system error value, or zero if DISK is NULL
93 on a system that requires a non-NULL value. */
95 get_fs_usage (char const *file, char const *disk, struct fs_usage *fsp)
97 #if defined STAT_STATVFS /* POSIX, except glibc/Linux */
101 if (statvfs (file, &fsd) < 0)
104 /* f_frsize isn't guaranteed to be supported. */
105 fsp->fsu_blocksize = (fsd.f_frsize
106 ? PROPAGATE_ALL_ONES (fsd.f_frsize)
107 : PROPAGATE_ALL_ONES (fsd.f_bsize));
109 #elif defined STAT_STATFS2_FS_DATA /* Ultrix */
113 if (statfs (file, &fsd) != 1)
116 fsp->fsu_blocksize = 1024;
117 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
118 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
119 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
120 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
121 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
122 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
124 #elif defined STAT_READ_FILSYS /* SVR2 */
126 # define SUPERBOFF (SUPERB * 512)
138 fd = open (disk, O_RDONLY);
141 lseek (fd, (off_t) SUPERBOFF, 0);
142 if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
149 fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
150 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
151 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
152 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
153 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
154 fsp->fsu_files = (fsd.s_isize == -1
156 : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
157 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
159 #elif defined STAT_STATFS3_OSF1 /* OSF/1 */
163 if (statfs (file, &fsd, sizeof (struct statfs)) != 0)
166 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
168 #elif defined STAT_STATFS2_BSIZE /* glibc/Linux, 4.3BSD, SunOS 4, \
169 MacOS X < 10.4, FreeBSD < 5.0, \
170 NetBSD < 3.0, OpenBSD < 4.4 */
174 if (statfs (file, &fsd) < 0)
177 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
179 # ifdef STATFS_TRUNCATES_BLOCK_COUNTS
181 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
182 struct statfs are truncated to 2GB. These conditions detect that
183 truncation, presumably without botching the 4.1.1 case, in which
184 the values are not truncated. The correct counts are stored in
185 undocumented spare fields. */
186 if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
188 fsd.f_blocks = fsd.f_spare[0];
189 fsd.f_bfree = fsd.f_spare[1];
190 fsd.f_bavail = fsd.f_spare[2];
192 # endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
194 #elif defined STAT_STATFS2_FSIZE /* 4.4BSD and older NetBSD */
198 if (statfs (file, &fsd) < 0)
201 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
203 #elif defined STAT_STATFS4 /* SVR3, Dynix, old Irix, old AIX, \
206 # if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
207 # define f_bavail f_bfree
212 if (statfs (file, &fsd, sizeof fsd, 0) < 0)
215 /* Empirically, the block counts on most SVR3 and SVR3-derived
216 systems seem to always be in terms of 512-byte blocks,
217 no matter what value f_bsize has. */
218 # if _AIX || defined _CRAY
219 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
221 fsp->fsu_blocksize = 512;
226 #if (defined STAT_STATVFS \
227 || (!defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS))
229 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
230 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
231 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
232 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
233 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
234 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
238 (void) disk; /* avoid argument-unused warning */
242 #if defined _AIX && defined _I386
243 /* AIX PS/2 does not supply statfs. */
246 statfs (char *file, struct statfs *fsb)
251 if (stat (file, &stats) != 0)
253 if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
256 fsb->f_bsize = fsd.du_bsize;
257 fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
258 fsb->f_bfree = fsd.du_tfree;
259 fsb->f_bavail = fsd.du_tfree;
260 fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
261 fsb->f_ffree = fsd.du_tinode;
262 fsb->f_fsid.val[0] = fsd.du_site;
263 fsb->f_fsid.val[1] = fsd.du_pckno;
267 #endif /* _AIX && _I386 */