1 /* fsusage.c -- return space usage of mounted filesystems
3 Copyright (C) 1991, 1992, 1996, 1998, 1999, 2002, 2003 Free
4 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 */
66 # include <sys/statfs.h>
69 #if HAVE_DUSTAT_H /* AIX PS/2 */
70 # include <sys/dustat.h>
73 #if HAVE_SYS_STATVFS_H /* SVR4 */
74 # include <sys/statvfs.h>
78 #include "full-read.h"
80 /* Many space usage primitives use all 1 bits to denote a value that is
81 not applicable or unknown. Propagate this information by returning
82 a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
83 is unsigned and narrower than uintmax_t. */
84 #define PROPAGATE_ALL_ONES(x) \
85 ((sizeof (x) < sizeof (uintmax_t) \
86 && (~ (x) == (sizeof (x) < sizeof (int) \
87 ? - (1 << (sizeof (x) * CHAR_BIT)) \
91 /* Extract the top bit of X as an uintmax_t value. */
92 #define EXTRACT_TOP_BIT(x) ((x) \
93 & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
95 /* If a value is negative, many space usage primitives store it into an
96 integer variable by assignment, even if the variable's type is unsigned.
97 So, if a space usage variable X's top bit is set, convert X to the
98 uintmax_t value V such that (- (uintmax_t) V) is the negative of
99 the original value. If X's top bit is clear, just yield X.
100 Use PROPAGATE_TOP_BIT if the original value might be negative;
101 otherwise, use PROPAGATE_ALL_ONES. */
102 #define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
104 /* Fill in the fields of FSP with information about space usage for
105 the filesystem on which PATH resides.
106 DISK is the device on which PATH is mounted, for space-getting
107 methods that need to know it.
108 Return 0 if successful, -1 if not. When returning -1, ensure that
109 ERRNO is either a system error value, or zero if DISK is NULL
110 on a system that requires a non-NULL value. */
112 get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp)
114 #ifdef STAT_STATFS3_OSF1
118 if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
121 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
123 #endif /* STAT_STATFS3_OSF1 */
125 #ifdef STAT_STATFS2_FS_DATA /* Ultrix */
129 if (statfs (path, &fsd) != 1)
132 fsp->fsu_blocksize = 1024;
133 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
134 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
135 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
136 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
137 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
138 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
140 #endif /* STAT_STATFS2_FS_DATA */
142 #ifdef STAT_READ_FILSYS /* SVR2 */
144 # define SUPERBOFF (SUPERB * 512)
156 fd = open (disk, O_RDONLY);
159 lseek (fd, (off_t) SUPERBOFF, 0);
160 if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
167 fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
168 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
169 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
170 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
171 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
172 fsp->fsu_files = (fsd.s_isize == -1
174 : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
175 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
177 #endif /* STAT_READ_FILSYS */
179 #ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
183 if (statfs (path, &fsd) < 0)
186 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
188 # ifdef STATFS_TRUNCATES_BLOCK_COUNTS
190 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
191 struct statfs are truncated to 2GB. These conditions detect that
192 truncation, presumably without botching the 4.1.1 case, in which
193 the values are not truncated. The correct counts are stored in
194 undocumented spare fields. */
195 if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
197 fsd.f_blocks = fsd.f_spare[0];
198 fsd.f_bfree = fsd.f_spare[1];
199 fsd.f_bavail = fsd.f_spare[2];
201 # endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
203 #endif /* STAT_STATFS2_BSIZE */
205 #ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
209 if (statfs (path, &fsd) < 0)
212 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
214 #endif /* STAT_STATFS2_FSIZE */
216 #ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
218 # if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
219 # define f_bavail f_bfree
224 if (statfs (path, &fsd, sizeof fsd, 0) < 0)
227 /* Empirically, the block counts on most SVR3 and SVR3-derived
228 systems seem to always be in terms of 512-byte blocks,
229 no matter what value f_bsize has. */
230 # if _AIX || defined _CRAY
231 fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
233 fsp->fsu_blocksize = 512;
236 #endif /* STAT_STATFS4 */
238 #ifdef STAT_STATVFS /* SVR4 */
242 if (statvfs (path, &fsd) < 0)
245 /* f_frsize isn't guaranteed to be supported. */
246 fsp->fsu_blocksize = (fsd.f_frsize
247 ? PROPAGATE_ALL_ONES (fsd.f_frsize)
248 : PROPAGATE_ALL_ONES (fsd.f_bsize));
250 #endif /* STAT_STATVFS */
252 #if !defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS
253 /* !Ultrix && !SVR2 */
255 fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
256 fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
257 fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
258 fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
259 fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
260 fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
262 #endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
267 #if defined _AIX && defined _I386
268 /* AIX PS/2 does not supply statfs. */
271 statfs (char *path, struct statfs *fsb)
276 if (stat (path, &stats))
278 if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
281 fsb->f_bsize = fsd.du_bsize;
282 fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
283 fsb->f_bfree = fsd.du_tfree;
284 fsb->f_bavail = fsd.du_tfree;
285 fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
286 fsb->f_ffree = fsd.du_tinode;
287 fsb->f_fsid.val[0] = fsd.du_site;
288 fsb->f_fsid.val[1] = fsd.du_pckno;
292 #endif /* _AIX && _I386 */