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 "%Z%%M% %I% %E% 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