xref: /onnv-gate/usr/src/uts/common/syscall/sysfs.c (revision 0:68f95e015346)
1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate  * CDDL HEADER START
3*0Sstevel@tonic-gate  *
4*0Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*0Sstevel@tonic-gate  * with the License.
8*0Sstevel@tonic-gate  *
9*0Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate  * and limitations under the License.
13*0Sstevel@tonic-gate  *
14*0Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate  *
20*0Sstevel@tonic-gate  * CDDL HEADER END
21*0Sstevel@tonic-gate  */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate  * Copyright 1993 Sun Microsystems, Inc.  All rights reserved.
24*0Sstevel@tonic-gate  * Use is subject to license terms.
25*0Sstevel@tonic-gate  */
26*0Sstevel@tonic-gate 
27*0Sstevel@tonic-gate /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
28*0Sstevel@tonic-gate /*	  All Rights Reserved  	*/
29*0Sstevel@tonic-gate 
30*0Sstevel@tonic-gate /*
31*0Sstevel@tonic-gate  * Portions of this source code were derived from Berkeley 4.3 BSD
32*0Sstevel@tonic-gate  * under license from the Regents of the University of California.
33*0Sstevel@tonic-gate  */
34*0Sstevel@tonic-gate 
35*0Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
36*0Sstevel@tonic-gate 
37*0Sstevel@tonic-gate #include <sys/types.h>
38*0Sstevel@tonic-gate #include <sys/t_lock.h>
39*0Sstevel@tonic-gate #include <sys/param.h>
40*0Sstevel@tonic-gate #include <sys/errno.h>
41*0Sstevel@tonic-gate #include <sys/fstyp.h>
42*0Sstevel@tonic-gate #include <sys/systm.h>
43*0Sstevel@tonic-gate #include <sys/mount.h>
44*0Sstevel@tonic-gate #include <sys/vfs.h>
45*0Sstevel@tonic-gate #include <sys/vnode.h>
46*0Sstevel@tonic-gate #include <sys/cmn_err.h>
47*0Sstevel@tonic-gate #include <sys/buf.h>
48*0Sstevel@tonic-gate #include <sys/debug.h>
49*0Sstevel@tonic-gate #include <sys/pathname.h>
50*0Sstevel@tonic-gate 
51*0Sstevel@tonic-gate /*
52*0Sstevel@tonic-gate  * System call to map fstype numbers to names, and vice versa.
53*0Sstevel@tonic-gate  */
54*0Sstevel@tonic-gate 
55*0Sstevel@tonic-gate static int sysfsind(char *);
56*0Sstevel@tonic-gate static int sysfstyp(int, char *);
57*0Sstevel@tonic-gate 
58*0Sstevel@tonic-gate int
sysfs(int opcode,long a1,long a2)59*0Sstevel@tonic-gate sysfs(int opcode, long a1, long a2)
60*0Sstevel@tonic-gate {
61*0Sstevel@tonic-gate 	int error;
62*0Sstevel@tonic-gate 
63*0Sstevel@tonic-gate 	switch (opcode) {
64*0Sstevel@tonic-gate 	case GETFSIND:
65*0Sstevel@tonic-gate 		error = sysfsind((char *)a1);
66*0Sstevel@tonic-gate 		break;
67*0Sstevel@tonic-gate 	case GETFSTYP:
68*0Sstevel@tonic-gate 		error = sysfstyp((int)a1, (char *)a2);
69*0Sstevel@tonic-gate 		break;
70*0Sstevel@tonic-gate 	case GETNFSTYP:
71*0Sstevel@tonic-gate 		/*
72*0Sstevel@tonic-gate 		 * Return number of fstypes configured in the system.
73*0Sstevel@tonic-gate 		 */
74*0Sstevel@tonic-gate 		return (nfstype - 1);
75*0Sstevel@tonic-gate 	default:
76*0Sstevel@tonic-gate 		error = set_errno(EINVAL);
77*0Sstevel@tonic-gate 	}
78*0Sstevel@tonic-gate 
79*0Sstevel@tonic-gate 	return (error);
80*0Sstevel@tonic-gate }
81*0Sstevel@tonic-gate 
82*0Sstevel@tonic-gate static int
sysfsind(char * fsname)83*0Sstevel@tonic-gate sysfsind(char *fsname)
84*0Sstevel@tonic-gate {
85*0Sstevel@tonic-gate 	/*
86*0Sstevel@tonic-gate 	 * Translate fs identifier to an index into the vfssw structure.
87*0Sstevel@tonic-gate 	 */
88*0Sstevel@tonic-gate 	struct vfssw *vswp;
89*0Sstevel@tonic-gate 	char fsbuf[FSTYPSZ];
90*0Sstevel@tonic-gate 	int retval;
91*0Sstevel@tonic-gate 	size_t len = 0;
92*0Sstevel@tonic-gate 
93*0Sstevel@tonic-gate 	retval = copyinstr(fsname, fsbuf, FSTYPSZ, &len);
94*0Sstevel@tonic-gate 	if (retval == ENOENT)			/* XXX */
95*0Sstevel@tonic-gate 		retval = EINVAL;		/* XXX */
96*0Sstevel@tonic-gate 	if (len == 1)			/* Includes null byte */
97*0Sstevel@tonic-gate 		retval = EINVAL;
98*0Sstevel@tonic-gate 	if (retval)
99*0Sstevel@tonic-gate 		return (set_errno(retval));
100*0Sstevel@tonic-gate 	/*
101*0Sstevel@tonic-gate 	 * Search the vfssw table for the fs identifier
102*0Sstevel@tonic-gate 	 * and return the index.
103*0Sstevel@tonic-gate 	 */
104*0Sstevel@tonic-gate 	if ((vswp = vfs_getvfssw(fsbuf)) != NULL) {
105*0Sstevel@tonic-gate 		retval = vswp - vfssw;
106*0Sstevel@tonic-gate 		vfs_unrefvfssw(vswp);
107*0Sstevel@tonic-gate 		return (retval);
108*0Sstevel@tonic-gate 	}
109*0Sstevel@tonic-gate 
110*0Sstevel@tonic-gate 	return (set_errno(EINVAL));
111*0Sstevel@tonic-gate }
112*0Sstevel@tonic-gate 
113*0Sstevel@tonic-gate static int
sysfstyp(int index,char * cbuf)114*0Sstevel@tonic-gate sysfstyp(int index, char *cbuf)
115*0Sstevel@tonic-gate {
116*0Sstevel@tonic-gate 	/*
117*0Sstevel@tonic-gate 	 * Translate fstype index into an fs identifier.
118*0Sstevel@tonic-gate 	 */
119*0Sstevel@tonic-gate 	char *src;
120*0Sstevel@tonic-gate 	struct vfssw *vswp;
121*0Sstevel@tonic-gate 	char *osrc;
122*0Sstevel@tonic-gate 	int error = 0;
123*0Sstevel@tonic-gate 
124*0Sstevel@tonic-gate 	if (index <= 0 || index >= nfstype)
125*0Sstevel@tonic-gate 		return (set_errno(EINVAL));
126*0Sstevel@tonic-gate 	RLOCK_VFSSW();
127*0Sstevel@tonic-gate 	vswp = &vfssw[index];
128*0Sstevel@tonic-gate 
129*0Sstevel@tonic-gate 	osrc = src = vswp->vsw_name;
130*0Sstevel@tonic-gate 	while (*src++)
131*0Sstevel@tonic-gate 		;
132*0Sstevel@tonic-gate 
133*0Sstevel@tonic-gate 	if (copyout(osrc, cbuf, src - osrc))
134*0Sstevel@tonic-gate 		error = set_errno(EFAULT);
135*0Sstevel@tonic-gate 	RUNLOCK_VFSSW();
136*0Sstevel@tonic-gate 	return (error);
137*0Sstevel@tonic-gate }
138