1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/* Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <mntent.h>
#include <paths.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/statvfs.h>
/* These definitions come from the kernel headers. But we cannot
include the headers here because of type clashes. If there will
become new filesystem types available we have to add the
appropriate definitions here.*/
#define ADFS_SUPER_MAGIC 0xadf5
#define AFFS_SUPER_MAGIC 0xadff
#define CODA_SUPER_MAGIC 0x73757245
#define EXT2_SUPER_MAGIC 0xef53
#define HPFS_SUPER_MAGIC 0xf995e849
#define ISOFS_SUPER_MAGIC 0x9660
#define MINIX_SUPER_MAGIC 0x137f
#define MINIX_SUPER_MAGIC2 0x138F
#define MINIX2_SUPER_MAGIC 0x2468
#define MINIX2_SUPER_MAGIC2 0x2478
#define MSDOS_SUPER_MAGIC 0x4d44
#define NCP_SUPER_MAGIC 0x564c
#define NFS_SUPER_MAGIC 0x6969
#define PROC_SUPER_MAGIC 0x9fa0
#define SMB_SUPER_MAGIC 0x517b
#define XENIX_SUPER_MAGIC 0x012ff7b4
#define SYSV4_SUPER_MAGIC 0x012ff7b5
#define SYSV2_SUPER_MAGIC 0x012ff7b6
#define COH_SUPER_MAGIC 0x012ff7b7
int
fstatvfs (int fd, struct statvfs *buf)
{
struct statfs fsbuf;
struct stat st;
/* Get as much information as possible from the system. */
if (__fstatfs (fd, &fsbuf) < 0)
return -1;
/* Now fill in the fields me have information for. */
buf->f_bsize = fsbuf.f_bsize;
buf->f_blocks = fsbuf.f_blocks;
buf->f_bfree = fsbuf.f_bfree;
buf->f_bavail = fsbuf.f_bavail;
buf->f_files = fsbuf.f_files;
buf->f_ffree = fsbuf.f_ffree;
buf->f_fsid = fsbuf.f_fsid;
buf->f_namemax = fsbuf.f_namelen;
memset (buf->f_spare, '\0', 6 * sizeof (int));
/* What remains to do is to fill the fields f_frsize, f_favail,
and f_flag. */
switch (fsbuf.f_type)
{
case EXT2_SUPER_MAGIC:
/* This is not really correct since the fragment size can vary. */
buf->f_frsize = 1024;
break;
case ADFS_SUPER_MAGIC:
case AFFS_SUPER_MAGIC:
case CODA_SUPER_MAGIC:
case HPFS_SUPER_MAGIC:
case ISOFS_SUPER_MAGIC:
case MINIX_SUPER_MAGIC:
case MINIX_SUPER_MAGIC2:
case MINIX2_SUPER_MAGIC:
case MINIX2_SUPER_MAGIC2:
case MSDOS_SUPER_MAGIC:
case NCP_SUPER_MAGIC:
case NFS_SUPER_MAGIC:
case PROC_SUPER_MAGIC:
case SMB_SUPER_MAGIC:
case XENIX_SUPER_MAGIC:
case SYSV4_SUPER_MAGIC:
case SYSV2_SUPER_MAGIC:
case COH_SUPER_MAGIC:
default:
/* I hope it's safe to assume no fragmentation. */
buf->f_frsize = buf->f_bsize;
break;
}
/* XXX I have no idea how to compute f_favail. Any idea??? */
buf->f_favail = buf->f_ffree;
/* Determining the flags is tricky. We have to read /proc/mount or
the /etc/matb file and search for the entry which matches the given
file. The way we can test for matching filesystem is using the
device number. */
buf->f_flag = 0;
if (fstat (fd, &st) >= 0)
{
int save_errno = errno;
struct mntent mntbuf;
FILE *mtab;
mtab = __setmntent ("/proc/mounts", "r");
if (mtab == NULL)
mtab = __setmntent (_PATH_MOUNTED, "r");
if (mtab != NULL)
{
char tmpbuf[1024];
while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf)))
{
struct stat fsst;
/* Find out about the device the current entry is for. */
if (stat (mntbuf.mnt_dir, &fsst) >= 0
&& st.st_dev == fsst.st_dev)
{
/* Bingo, we found the entry for the device FD is on.
Now interpret the option string. */
char *cp = mntbuf.mnt_opts;
char *opt;
while ((opt = strsep (&cp, ",")) != NULL)
if (strcmp (opt, "ro") == 0)
buf->f_flag |= ST_RDONLY;
else if (strcmp (opt, "nosuid") == 0)
buf->f_flag |= ST_NOSUID;
else if (strcmp (opt, "noexec") == 0)
buf->f_flag |= ST_NOEXEC;
else if (strcmp (opt, "nodev") == 0)
buf->f_flag |= ST_NODEV;
else if (strcmp (opt, "sync") == 0)
buf->f_flag |= ST_SYNCHRONOUS;
else if (strcmp (opt, "mand") == 0)
buf->f_flag |= ST_MANDLOCK;
else if (strcmp (opt, "noatime") == 0)
buf->f_flag |= ST_NOATIME;
/* We can stop looking for more entries. */
break;
}
}
/* Close the file. */
__endmntent (mtab);
}
__set_errno (save_errno);
}
/* We signal success if the statfs call succeeded. */
return 0;
}
|
