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 #include <sys/inttypes.h>
35 #include <sys/types.h>
36 #include <sys/t_lock.h>
37 #include <sys/param.h>
38 #include <sys/errno.h>
39 #include <sys/fstyp.h>
40 #include <sys/systm.h>
41 #include <sys/vfs.h>
42 #include <sys/statfs.h>
43 #include <sys/vnode.h>
44 #include <sys/file.h>
45 #include <sys/cmn_err.h>
46 #include <sys/debug.h>
47 #include <sys/pathname.h>
48
49 #include <vm/page.h>
50 #include <fs/fs_subr.h>
51
52 #if defined(_SYSCALL32_IMPL) || defined(_ILP32)
53
54 /*
55 * statfs(2) and fstatfs(2) have been replaced by statvfs(2) and
56 * fstatvfs(2) and will be removed from the system in a near-future
57 * release.
58 *
59 * Supported here purely for 32-bit compatibility.
60 */
61
62 static int cstatfs(struct vfs *, struct statfs32 *, int);
63
64 int
statfs32(char * fname,struct statfs32 * sbp,int32_t len,int32_t fstyp)65 statfs32(char *fname, struct statfs32 *sbp, int32_t len, int32_t fstyp)
66 {
67 vnode_t *vp;
68 int error;
69 int estale_retry = 0;
70
71 lookup:
72 if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) {
73 if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
74 goto lookup;
75 return (set_errno(error));
76 }
77 if (fstyp != 0)
78 error = EINVAL;
79 else
80 error = cstatfs(vp->v_vfsp, sbp, len);
81 VN_RELE(vp);
82 if (error) {
83 if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
84 goto lookup;
85 return (set_errno(error));
86 }
87 return (0);
88 }
89
90 int
fstatfs32(int32_t fdes,struct statfs32 * sbp,int32_t len,int32_t fstyp)91 fstatfs32(int32_t fdes, struct statfs32 *sbp, int32_t len, int32_t fstyp)
92 {
93 struct file *fp;
94 int error;
95
96 if (fstyp != 0)
97 return (set_errno(EINVAL));
98 if ((fp = getf(fdes)) == NULL)
99 return (set_errno(EBADF));
100 error = cstatfs(fp->f_vnode->v_vfsp, sbp, len);
101 releasef(fdes);
102 if (error)
103 return (set_errno(error));
104 return (0);
105 }
106
107 /*
108 * Common routine for fstatfs and statfs.
109 */
110 static int
cstatfs(struct vfs * vfsp,struct statfs32 * sbp,int len)111 cstatfs(struct vfs *vfsp, struct statfs32 *sbp, int len)
112 {
113 struct statfs32 sfs;
114 struct statvfs64 svfs;
115 int error, i;
116 char *cp, *cp2;
117 struct vfssw *vswp;
118
119 if (len < 0 || len > sizeof (struct statfs))
120 return (EINVAL);
121 if (error = VFS_STATVFS(vfsp, &svfs))
122 return (error);
123
124 if (svfs.f_blocks > UINT32_MAX || svfs.f_bfree > UINT32_MAX ||
125 svfs.f_files > UINT32_MAX || svfs.f_ffree > UINT32_MAX)
126 return (EOVERFLOW);
127 /*
128 * Map statvfs fields into the old statfs structure.
129 */
130 bzero(&sfs, sizeof (sfs));
131 sfs.f_bsize = svfs.f_bsize;
132 sfs.f_frsize = (svfs.f_frsize == svfs.f_bsize) ? 0 : svfs.f_frsize;
133 sfs.f_blocks = svfs.f_blocks * (svfs.f_frsize / 512);
134 sfs.f_bfree = svfs.f_bfree * (svfs.f_frsize / 512);
135 sfs.f_files = svfs.f_files;
136 sfs.f_ffree = svfs.f_ffree;
137
138 cp = svfs.f_fstr;
139 cp2 = sfs.f_fname;
140 i = 0;
141 while (i++ < sizeof (sfs.f_fname))
142 if (*cp != '\0')
143 *cp2++ = *cp++;
144 else
145 *cp2++ = '\0';
146 while (*cp != '\0' &&
147 i++ < (sizeof (svfs.f_fstr) - sizeof (sfs.f_fpack)))
148 cp++;
149 (void) strncpy(sfs.f_fpack, cp + 1, sizeof (sfs.f_fpack));
150 if ((vswp = vfs_getvfssw(svfs.f_basetype)) == NULL)
151 sfs.f_fstyp = 0;
152 else {
153 sfs.f_fstyp = vswp - vfssw;
154 vfs_unrefvfssw(vswp);
155 }
156
157 if (copyout(&sfs, sbp, len))
158 return (EFAULT);
159
160 return (0);
161 }
162
163 #endif /* _SYSCALL32_IMPL || _ILP32 */
164