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57 * statfs(2) and fstatfs(2) have been replaced by statvfs(2) and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
64 static int cstatfs(struct vfs *, struct statfs32 *, int);
65
66 int
statfs32(char * fname,struct statfs32 * sbp,int32_t len,int32_t fstyp)67 statfs32(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
73 lookup:
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
92 int
fstatfs32(int32_t fdes,struct statfs32 * sbp,int32_t len,int32_t fstyp)93 fstatfs32(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 */
112 static int
cstatfs(struct vfs * vfsp,struct statfs32 * sbp,int len)113 cstatfs(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