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 <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#include "namespace.h"
34#include <sys/param.h>
35#include <sys/mount.h>
36#include <sys/statvfs.h>
37
38#include <errno.h>
39#include <limits.h>
40#include <unistd.h>
41#include "un-namespace.h"
42
43static int	sfs2svfs(const struct statfs *from, struct statvfs *to);
44
45int
46fstatvfs(int fd, struct statvfs *result)
47{
48	struct statfs sfs;
49	int rv;
50	long pcval;
51
52	rv = _fstatfs(fd, &sfs);
53	if (rv != 0)
54		return (rv);
55
56	rv = sfs2svfs(&sfs, result);
57	if (rv != 0)
58		return (rv);
59
60	/*
61	 * Whether pathconf's -1 return means error or unlimited does not
62	 * make any difference in this best-effort implementation.
63	 */
64	pcval = _fpathconf(fd, _PC_NAME_MAX);
65	if (pcval == -1)
66		result->f_namemax = ~0UL;
67	else
68		result->f_namemax = (unsigned long)pcval;
69	return (0);
70}
71
72int
73statvfs(const char * __restrict path, struct statvfs * __restrict result)
74{
75	struct statfs sfs;
76	int rv;
77	long pcval;
78
79	rv = statfs(path, &sfs);
80	if (rv != 0)
81		return (rv);
82
83	sfs2svfs(&sfs, result);
84
85	/*
86	 * Whether pathconf's -1 return means error or unlimited does not
87	 * make any difference in this best-effort implementation.
88	 */
89	pcval = pathconf(path, _PC_NAME_MAX);
90	if (pcval == -1)
91		result->f_namemax = ~0UL;
92	else
93		result->f_namemax = (unsigned long)pcval;
94	return (0);
95}
96
97static int
98sfs2svfs(const struct statfs *from, struct statvfs *to)
99{
100	static const struct statvfs zvfs;
101
102	*to = zvfs;
103
104	if (from->f_flags & MNT_RDONLY)
105		to->f_flag |= ST_RDONLY;
106	if (from->f_flags & MNT_NOSUID)
107		to->f_flag |= ST_NOSUID;
108
109	/* XXX should we clamp negative values? */
110#define COPY(field) \
111	do { \
112		to->field = from->field; \
113		if (from->field != to->field) { \
114			errno = EOVERFLOW; \
115			return (-1); \
116		} \
117	} while(0)
118
119	COPY(f_bavail);
120	COPY(f_bfree);
121	COPY(f_blocks);
122	COPY(f_ffree);
123	COPY(f_files);
124	to->f_bsize = from->f_iosize;
125	to->f_frsize = from->f_bsize;
126	to->f_favail = to->f_ffree;
127	return (0);
128}
129
130#ifdef MAIN
131#include <err.h>
132#include <stdint.h>
133#include <stdio.h>
134
135int
136main(int argc, char **argv)
137{
138	struct statvfs buf;
139
140	if (statvfs(argv[1], &buf) < 0)
141		err(1, "statvfs");
142
143#define SHOW(field) \
144	printf(#field ": %ju\n", (uintmax_t)buf.field)
145
146	SHOW(f_bavail);
147	SHOW(f_bfree);
148	SHOW(f_blocks);
149	SHOW(f_favail);
150	SHOW(f_ffree);
151	SHOW(f_files);
152	SHOW(f_bsize);
153	SHOW(f_frsize);
154	SHOW(f_namemax);
155	printf("f_flag: %lx\n", (unsigned long)buf.f_flag);
156
157	return 0;
158}
159
160#endif /* MAIN */
161