1 /*
2 * Copyright 2002 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include "namespace.h"
31 #include <sys/param.h>
32 #include <sys/mount.h>
33 #include <sys/statvfs.h>
34
35 #include <errno.h>
36 #include <limits.h>
37 #include <unistd.h>
38 #include "un-namespace.h"
39
40 static int sfs2svfs(const struct statfs *from, struct statvfs *to);
41
42 int
fstatvfs(int fd,struct statvfs * result)43 fstatvfs(int fd, struct statvfs *result)
44 {
45 struct statfs sfs;
46 int rv;
47 long pcval;
48
49 rv = _fstatfs(fd, &sfs);
50 if (rv != 0)
51 return (rv);
52
53 rv = sfs2svfs(&sfs, result);
54 if (rv != 0)
55 return (rv);
56
57 /*
58 * Whether pathconf's -1 return means error or unlimited does not
59 * make any difference in this best-effort implementation.
60 */
61 pcval = _fpathconf(fd, _PC_NAME_MAX);
62 if (pcval == -1)
63 result->f_namemax = ~0UL;
64 else
65 result->f_namemax = (unsigned long)pcval;
66 return (0);
67 }
68
69 int
statvfs(const char * __restrict path,struct statvfs * __restrict result)70 statvfs(const char * __restrict path, struct statvfs * __restrict result)
71 {
72 struct statfs sfs;
73 int rv;
74 long pcval;
75
76 rv = statfs(path, &sfs);
77 if (rv != 0)
78 return (rv);
79
80 sfs2svfs(&sfs, result);
81
82 /*
83 * Whether pathconf's -1 return means error or unlimited does not
84 * make any difference in this best-effort implementation.
85 */
86 pcval = pathconf(path, _PC_NAME_MAX);
87 if (pcval == -1)
88 result->f_namemax = ~0UL;
89 else
90 result->f_namemax = (unsigned long)pcval;
91 return (0);
92 }
93
94 static int
sfs2svfs(const struct statfs * from,struct statvfs * to)95 sfs2svfs(const struct statfs *from, struct statvfs *to)
96 {
97 static const struct statvfs zvfs;
98
99 *to = zvfs;
100
101 if (from->f_flags & MNT_RDONLY)
102 to->f_flag |= ST_RDONLY;
103 if (from->f_flags & MNT_NOSUID)
104 to->f_flag |= ST_NOSUID;
105
106 /* XXX should we clamp negative values? */
107 #define COPY(field) \
108 do { \
109 to->field = from->field; \
110 if (from->field != to->field) { \
111 errno = EOVERFLOW; \
112 return (-1); \
113 } \
114 } while(0)
115
116 COPY(f_bavail);
117 COPY(f_bfree);
118 COPY(f_blocks);
119 COPY(f_ffree);
120 COPY(f_files);
121 to->f_bsize = from->f_iosize;
122 to->f_frsize = from->f_bsize;
123 to->f_favail = to->f_ffree;
124 return (0);
125 }
126
127 #ifdef MAIN
128 #include <err.h>
129 #include <stdint.h>
130 #include <stdio.h>
131
132 int
main(int argc,char ** argv)133 main(int argc, char **argv)
134 {
135 struct statvfs buf;
136
137 if (statvfs(argv[1], &buf) < 0)
138 err(1, "statvfs");
139
140 #define SHOW(field) \
141 printf(#field ": %ju\n", (uintmax_t)buf.field)
142
143 SHOW(f_bavail);
144 SHOW(f_bfree);
145 SHOW(f_blocks);
146 SHOW(f_favail);
147 SHOW(f_ffree);
148 SHOW(f_files);
149 SHOW(f_bsize);
150 SHOW(f_frsize);
151 SHOW(f_namemax);
152 printf("f_flag: %lx\n", (unsigned long)buf.f_flag);
153
154 return 0;
155 }
156
157 #endif /* MAIN */
158