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 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 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 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