1 /* fsusage.c -- return space usage of mounted filesystems
2 Copyright (C) 1991, 1992 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
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #include <sys/types.h>
28 #ifdef HAVE_SYS_PARAM_H
29 #include <sys/param.h>
32 #ifdef HAVE_SYS_MOUNT_H
33 #include <sys/mount.h>
40 #ifdef HAVE_SYS_FILSYS_H
41 #include <sys/filsys.h> /* SVR2. */
48 #ifdef HAVE_SYS_STATFS_H
49 #include <sys/statfs.h>
52 #ifdef HAVE_DUSTAT_H /* AIX PS/2. */
53 #include <sys/dustat.h>
56 #ifdef HAVE_SYS_STATVFS_H /* SVR4. */
57 #include <sys/statvfs.h>
63 /* Return the number of TOSIZE-byte blocks used by
64 BLOCKS FROMSIZE-byte blocks, rounding away from zero.
65 TOSIZE must be positive. Return -1 if FROMSIZE is not positive. */
68 adjust_blocks (blocks, fromsize, tosize)
77 if (fromsize == tosize) /* E.g., from 512 to 512. */
79 else if (fromsize > tosize) /* E.g., from 2048 to 512. */
80 return blocks * (fromsize / tosize);
81 else /* E.g., from 256 to 512. */
82 return (blocks + (blocks < 0 ? -1 : 1)) / (tosize / fromsize);
85 /* Fill in the fields of FSP with information about space usage for
86 the filesystem on which PATH resides.
87 DISK is the device on which PATH is mounted, for space-getting
88 methods that need to know it.
89 Return 0 if successful, -1 if not. */
92 get_fs_usage (path, disk, fsp)
96 #if defined (STAT_STATFS3_OSF1)
99 if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
101 #define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_fsize, 512)
102 #endif /* STAT_STATFS3_OSF1 */
104 #ifdef STAT_STATFS2_FS_DATA /* Ultrix. */
107 if (statfs (path, &fsd) != 1)
109 #define CONVERT_BLOCKS(b) adjust_blocks ((b), 1024, 512)
110 fsp->fsu_blocks = CONVERT_BLOCKS (fsd.fd_req.btot);
111 fsp->fsu_bfree = CONVERT_BLOCKS (fsd.fd_req.bfree);
112 fsp->fsu_bavail = CONVERT_BLOCKS (fsd.fd_req.bfreen);
113 fsp->fsu_files = fsd.fd_req.gtot;
114 fsp->fsu_ffree = fsd.fd_req.gfree;
117 #ifdef STAT_READ_FILSYS /* SVR2. */
119 #define SUPERBOFF (SUPERB * 512)
124 fd = open (disk, O_RDONLY);
127 lseek (fd, (long) SUPERBOFF, 0);
128 if (safe_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
134 #define CONVERT_BLOCKS(b) adjust_blocks ((b), (fsd.s_type == Fs2b ? 1024 : 512), 512)
135 fsp->fsu_blocks = CONVERT_BLOCKS (fsd.s_fsize);
136 fsp->fsu_bfree = CONVERT_BLOCKS (fsd.s_tfree);
137 fsp->fsu_bavail = CONVERT_BLOCKS (fsd.s_tfree);
138 fsp->fsu_files = (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1);
139 fsp->fsu_ffree = fsd.s_tinode;
142 #ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX. */
145 if (statfs (path, &fsd) < 0)
148 #ifdef STATFS_TRUNCATES_BLOCK_COUNTS
149 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
150 struct statfs are truncated to 2GB. These conditions detect that
151 truncation, presumably without botching the 4.1.1 case, in which
152 the values are not truncated. The correct counts are stored in
153 undocumented spare fields. */
154 if (fsd.f_blocks == 0x1fffff && fsd.f_spare[0] > 0)
156 fsd.f_blocks = fsd.f_spare[0];
157 fsd.f_bfree = fsd.f_spare[1];
158 fsd.f_bavail = fsd.f_spare[2];
160 #endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
162 #define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_bsize, 512)
165 #ifdef STAT_STATFS2_FSIZE /* 4.4BSD. */
168 if (statfs (path, &fsd) < 0)
170 #define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_fsize, 512)
173 #ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX. */
176 if (statfs (path, &fsd, sizeof fsd, 0) < 0)
178 /* Empirically, the block counts on most SVR3 and SVR3-derived
179 systems seem to always be in terms of 512-byte blocks,
180 no matter what value f_bsize has. */
182 # define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_bsize, 512)
184 # define CONVERT_BLOCKS(b) (b)
185 # ifndef _SEQUENT_ /* _SEQUENT_ is DYNIX/ptx. */
186 # ifndef DOLPHIN /* DOLPHIN 3.8.alfa/7.18 has f_bavail */
187 # define f_bavail f_bfree
193 #ifdef STAT_STATVFS /* SVR4. */
196 if (statvfs (path, &fsd) < 0)
198 /* f_frsize isn't guaranteed to be supported. */
199 #define CONVERT_BLOCKS(b) \
200 adjust_blocks ((b), fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize, 512)
203 #if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ_FILSYS) /* !Ultrix && !SVR2. */
204 fsp->fsu_blocks = CONVERT_BLOCKS (fsd.f_blocks);
205 fsp->fsu_bfree = CONVERT_BLOCKS (fsd.f_bfree);
206 fsp->fsu_bavail = CONVERT_BLOCKS (fsd.f_bavail);
207 fsp->fsu_files = fsd.f_files;
208 fsp->fsu_ffree = fsd.f_ffree;
214 #if defined(_AIX) && defined(_I386)
215 /* AIX PS/2 does not supply statfs. */
225 if (stat (path, &stats))
227 if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
230 fsb->f_bsize = fsd.du_bsize;
231 fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
232 fsb->f_bfree = fsd.du_tfree;
233 fsb->f_bavail = fsd.du_tfree;
234 fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
235 fsb->f_ffree = fsd.du_tinode;
236 fsb->f_fsid.val[0] = fsd.du_site;
237 fsb->f_fsid.val[1] = fsd.du_pckno;
240 #endif /* _AIX && _I386 */