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      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 #pragma ident	"@(#)sysfs.c	1.5	05/06/08 SMI"
     36 
     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/mount.h>
     44 #include <sys/vfs.h>
     45 #include <sys/vnode.h>
     46 #include <sys/cmn_err.h>
     47 #include <sys/buf.h>
     48 #include <sys/debug.h>
     49 #include <sys/pathname.h>
     50 
     51 /*
     52  * System call to map fstype numbers to names, and vice versa.
     53  */
     54 
     55 static int sysfsind(char *);
     56 static int sysfstyp(int, char *);
     57 
     58 int
     59 sysfs(int opcode, long a1, long a2)
     60 {
     61 	int error;
     62 
     63 	switch (opcode) {
     64 	case GETFSIND:
     65 		error = sysfsind((char *)a1);
     66 		break;
     67 	case GETFSTYP:
     68 		error = sysfstyp((int)a1, (char *)a2);
     69 		break;
     70 	case GETNFSTYP:
     71 		/*
     72 		 * Return number of fstypes configured in the system.
     73 		 */
     74 		return (nfstype - 1);
     75 	default:
     76 		error = set_errno(EINVAL);
     77 	}
     78 
     79 	return (error);
     80 }
     81 
     82 static int
     83 sysfsind(char *fsname)
     84 {
     85 	/*
     86 	 * Translate fs identifier to an index into the vfssw structure.
     87 	 */
     88 	struct vfssw *vswp;
     89 	char fsbuf[FSTYPSZ];
     90 	int retval;
     91 	size_t len = 0;
     92 
     93 	retval = copyinstr(fsname, fsbuf, FSTYPSZ, &len);
     94 	if (retval == ENOENT)			/* XXX */
     95 		retval = EINVAL;		/* XXX */
     96 	if (len == 1)			/* Includes null byte */
     97 		retval = EINVAL;
     98 	if (retval)
     99 		return (set_errno(retval));
    100 	/*
    101 	 * Search the vfssw table for the fs identifier
    102 	 * and return the index.
    103 	 */
    104 	if ((vswp = vfs_getvfssw(fsbuf)) != NULL) {
    105 		retval = vswp - vfssw;
    106 		vfs_unrefvfssw(vswp);
    107 		return (retval);
    108 	}
    109 
    110 	return (set_errno(EINVAL));
    111 }
    112 
    113 static int
    114 sysfstyp(int index, char *cbuf)
    115 {
    116 	/*
    117 	 * Translate fstype index into an fs identifier.
    118 	 */
    119 	char *src;
    120 	struct vfssw *vswp;
    121 	char *osrc;
    122 	int error = 0;
    123 
    124 	if (index <= 0 || index >= nfstype)
    125 		return (set_errno(EINVAL));
    126 	RLOCK_VFSSW();
    127 	vswp = &vfssw[index];
    128 
    129 	osrc = src = vswp->vsw_name;
    130 	while (*src++)
    131 		;
    132 
    133 	if (copyout(osrc, cbuf, src - osrc))
    134 		error = set_errno(EFAULT);
    135 	RUNLOCK_VFSSW();
    136 	return (error);
    137 }
    138