1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
27/*	  All Rights Reserved  	*/
28
29/*
30 * Portions of this source code were derived from Berkeley 4.3 BSD
31 * under license from the Regents of the University of California.
32 */
33
34#pragma ident	"%Z%%M%	%I%	%E% SMI"
35
36#include <sys/inttypes.h>
37#include <sys/types.h>
38#include <sys/t_lock.h>
39#include <sys/param.h>
40#include <sys/errno.h>
41#include <sys/fstyp.h>
42#include <sys/systm.h>
43#include <sys/vfs.h>
44#include <sys/statfs.h>
45#include <sys/vnode.h>
46#include <sys/file.h>
47#include <sys/cmn_err.h>
48#include <sys/debug.h>
49#include <sys/pathname.h>
50
51#include <vm/page.h>
52#include <fs/fs_subr.h>
53
54#if defined(_SYSCALL32_IMPL) || defined(_ILP32)
55
56/*
57 * statfs(2) and fstatfs(2) have been replaced by statvfs(2) and
58 * fstatvfs(2) and will be removed from the system in a near-future
59 * release.
60 *
61 * Supported here purely for 32-bit compatibility.
62 */
63
64static int cstatfs(struct vfs *, struct statfs32 *, int);
65
66int
67statfs32(char *fname, struct statfs32 *sbp, int32_t len, int32_t fstyp)
68{
69	vnode_t *vp;
70	int error;
71	int estale_retry = 0;
72
73lookup:
74	if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) {
75		if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
76			goto lookup;
77		return (set_errno(error));
78	}
79	if (fstyp != 0)
80		error = EINVAL;
81	else
82		error = cstatfs(vp->v_vfsp, sbp, len);
83	VN_RELE(vp);
84	if (error) {
85		if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
86			goto lookup;
87		return (set_errno(error));
88	}
89	return (0);
90}
91
92int
93fstatfs32(int32_t fdes, struct statfs32 *sbp, int32_t len, int32_t fstyp)
94{
95	struct file *fp;
96	int error;
97
98	if (fstyp != 0)
99		return (set_errno(EINVAL));
100	if ((fp = getf(fdes)) == NULL)
101		return (set_errno(EBADF));
102	error = cstatfs(fp->f_vnode->v_vfsp, sbp, len);
103	releasef(fdes);
104	if (error)
105		return (set_errno(error));
106	return (0);
107}
108
109/*
110 * Common routine for fstatfs and statfs.
111 */
112static int
113cstatfs(struct vfs *vfsp, struct statfs32 *sbp, int len)
114{
115	struct statfs32 sfs;
116	struct statvfs64 svfs;
117	int error, i;
118	char *cp, *cp2;
119	struct vfssw *vswp;
120
121	if (len < 0 || len > sizeof (struct statfs))
122		return (EINVAL);
123	if (error = VFS_STATVFS(vfsp, &svfs))
124		return (error);
125
126	if (svfs.f_blocks > UINT32_MAX || svfs.f_bfree > UINT32_MAX ||
127	    svfs.f_files > UINT32_MAX || svfs.f_ffree > UINT32_MAX)
128	    return (EOVERFLOW);
129	/*
130	 * Map statvfs fields into the old statfs structure.
131	 */
132	bzero(&sfs, sizeof (sfs));
133	sfs.f_bsize = svfs.f_bsize;
134	sfs.f_frsize = (svfs.f_frsize == svfs.f_bsize) ? 0 : svfs.f_frsize;
135	sfs.f_blocks = svfs.f_blocks * (svfs.f_frsize / 512);
136	sfs.f_bfree = svfs.f_bfree * (svfs.f_frsize / 512);
137	sfs.f_files = svfs.f_files;
138	sfs.f_ffree = svfs.f_ffree;
139
140	cp = svfs.f_fstr;
141	cp2 = sfs.f_fname;
142	i = 0;
143	while (i++ < sizeof (sfs.f_fname))
144		if (*cp != '\0')
145			*cp2++ = *cp++;
146		else
147			*cp2++ = '\0';
148	while (*cp != '\0' &&
149	    i++ < (sizeof (svfs.f_fstr) - sizeof (sfs.f_fpack)))
150		cp++;
151	(void) strncpy(sfs.f_fpack, cp + 1, sizeof (sfs.f_fpack));
152	if ((vswp = vfs_getvfssw(svfs.f_basetype)) == NULL)
153		sfs.f_fstyp = 0;
154	else {
155		sfs.f_fstyp = vswp - vfssw;
156		vfs_unrefvfssw(vswp);
157	}
158
159	if (copyout(&sfs, sbp, len))
160		return (EFAULT);
161
162	return (0);
163}
164
165#endif	/* _SYSCALL32_IMPL || _ILP32 */
166