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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1993 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * Portions of this source code were derived from Berkeley 4.3 BSD
32 * under license from the Regents of the University of California.
33 */
34
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/mount.h>
42 #include <sys/vfs.h>
43 #include <sys/vnode.h>
44 #include <sys/cmn_err.h>
45 #include <sys/buf.h>
46 #include <sys/debug.h>
47 #include <sys/pathname.h>
48
49 /*
50 * System call to map fstype numbers to names, and vice versa.
51 */
52
53 static int sysfsind(char *);
54 static int sysfstyp(int, char *);
55
56 int
sysfs(int opcode,long a1,long a2)57 sysfs(int opcode, long a1, long a2)
58 {
59 int error;
60
61 switch (opcode) {
62 case GETFSIND:
63 error = sysfsind((char *)a1);
64 break;
65 case GETFSTYP:
66 error = sysfstyp((int)a1, (char *)a2);
67 break;
68 case GETNFSTYP:
69 /*
70 * Return number of fstypes configured in the system.
71 */
72 return (nfstype - 1);
73 default:
74 error = set_errno(EINVAL);
75 }
76
77 return (error);
78 }
79
80 static int
sysfsind(char * fsname)81 sysfsind(char *fsname)
82 {
83 /*
84 * Translate fs identifier to an index into the vfssw structure.
85 */
86 struct vfssw *vswp;
87 char fsbuf[FSTYPSZ];
88 int retval;
89 size_t len = 0;
90
91 retval = copyinstr(fsname, fsbuf, FSTYPSZ, &len);
92 if (retval == ENOENT) /* XXX */
93 retval = EINVAL; /* XXX */
94 if (len == 1) /* Includes null byte */
95 retval = EINVAL;
96 if (retval)
97 return (set_errno(retval));
98 /*
99 * Search the vfssw table for the fs identifier
100 * and return the index.
101 */
102 if ((vswp = vfs_getvfssw(fsbuf)) != NULL) {
103 retval = vswp - vfssw;
104 vfs_unrefvfssw(vswp);
105 return (retval);
106 }
107
108 return (set_errno(EINVAL));
109 }
110
111 static int
sysfstyp(int index,char * cbuf)112 sysfstyp(int index, char *cbuf)
113 {
114 /*
115 * Translate fstype index into an fs identifier.
116 */
117 char *src;
118 struct vfssw *vswp;
119 char *osrc;
120 int error = 0;
121
122 if (index <= 0 || index >= nfstype)
123 return (set_errno(EINVAL));
124 RLOCK_VFSSW();
125 vswp = &vfssw[index];
126
127 osrc = src = vswp->vsw_name;
128 while (*src++)
129 ;
130
131 if (copyout(osrc, cbuf, src - osrc))
132 error = set_errno(EFAULT);
133 RUNLOCK_VFSSW();
134 return (error);
135 }
136