mount_nullfs.c revision 15770
11558Srgrimes/* 21558Srgrimes * Copyright (c) 1992, 1993, 1994 31558Srgrimes * The Regents of the University of California. All rights reserved. 41558Srgrimes * 51558Srgrimes * This code is derived from software donated to Berkeley by 61558Srgrimes * Jan-Simon Pendry. 71558Srgrimes * 81558Srgrimes * Redistribution and use in source and binary forms, with or without 91558Srgrimes * modification, are permitted provided that the following conditions 101558Srgrimes * are met: 111558Srgrimes * 1. Redistributions of source code must retain the above copyright 121558Srgrimes * notice, this list of conditions and the following disclaimer. 131558Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141558Srgrimes * notice, this list of conditions and the following disclaimer in the 151558Srgrimes * documentation and/or other materials provided with the distribution. 161558Srgrimes * 3. All advertising materials mentioning features or use of this software 171558Srgrimes * must display the following acknowledgement: 181558Srgrimes * This product includes software developed by the University of 191558Srgrimes * California, Berkeley and its contributors. 201558Srgrimes * 4. Neither the name of the University nor the names of its contributors 211558Srgrimes * may be used to endorse or promote products derived from this software 221558Srgrimes * without specific prior written permission. 231558Srgrimes * 241558Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251558Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261558Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271558Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281558Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291558Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301558Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311558Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321558Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331558Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341558Srgrimes * SUCH DAMAGE. 351558Srgrimes */ 361558Srgrimes 371558Srgrimes#ifndef lint 381558Srgrimeschar copyright[] = 391558Srgrimes"@(#) Copyright (c) 1992, 1993, 1994\n\ 401558Srgrimes The Regents of the University of California. All rights reserved.\n"; 411558Srgrimes#endif /* not lint */ 421558Srgrimes 431558Srgrimes#ifndef lint 4415770Swollman/* 451558Srgrimesstatic char sccsid[] = "@(#)mount_null.c 8.5 (Berkeley) 3/27/94"; 4615770Swollman*/ 4715770Swollmanstatic const char rcsid[] = 4815770Swollman "$Id$"; 491558Srgrimes#endif /* not lint */ 501558Srgrimes 511558Srgrimes#include <sys/param.h> 521558Srgrimes#include <sys/mount.h> 531558Srgrimes#include <miscfs/nullfs/null.h> 541558Srgrimes 551558Srgrimes#include <err.h> 561558Srgrimes#include <stdio.h> 571558Srgrimes#include <stdlib.h> 581558Srgrimes#include <string.h> 5915770Swollman#include <sysexits.h> 6015770Swollman#include <unistd.h> 611558Srgrimes 621558Srgrimes#include "mntopts.h" 631558Srgrimes 641558Srgrimesstruct mntopt mopts[] = { 651558Srgrimes MOPT_STDOPTS, 661558Srgrimes { NULL } 671558Srgrimes}; 681558Srgrimes 691558Srgrimesint subdir __P((const char *, const char *)); 7015770Swollmanstatic __dead void usage __P((void)) __dead2; 711558Srgrimes 721558Srgrimesint 731558Srgrimesmain(argc, argv) 741558Srgrimes int argc; 751558Srgrimes char *argv[]; 761558Srgrimes{ 771558Srgrimes struct null_args args; 781558Srgrimes int ch, mntflags; 791558Srgrimes char target[MAXPATHLEN]; 802999Swollman struct vfsconf *vfc; 811558Srgrimes 821558Srgrimes mntflags = 0; 831558Srgrimes while ((ch = getopt(argc, argv, "o:")) != EOF) 841558Srgrimes switch(ch) { 851558Srgrimes case 'o': 864065Swollman getmntopts(optarg, mopts, &mntflags, 0); 871558Srgrimes break; 881558Srgrimes case '?': 891558Srgrimes default: 901558Srgrimes usage(); 911558Srgrimes } 921558Srgrimes argc -= optind; 931558Srgrimes argv += optind; 941558Srgrimes 951558Srgrimes if (argc != 2) 961558Srgrimes usage(); 971558Srgrimes 981558Srgrimes if (realpath(argv[0], target) == 0) 9915770Swollman err(EX_OSERR, "%s", target); 1001558Srgrimes 1011558Srgrimes if (subdir(target, argv[1]) || subdir(argv[1], target)) 10215770Swollman errx(EX_USAGE, "%s (%s) and %s are not distinct paths", 1031558Srgrimes argv[0], target, argv[1]); 1041558Srgrimes 1051558Srgrimes args.target = target; 1061558Srgrimes 1072999Swollman vfc = getvfsbyname("null"); 1082999Swollman if(!vfc && vfsisloadable("null")) { 1092999Swollman if(vfsload("null")) 11015770Swollman err(EX_OSERR, "vfsload(null)"); 1112999Swollman endvfsent(); /* flush cache */ 1122999Swollman vfc = getvfsbyname("null"); 1132999Swollman } 11415770Swollman if (!vfc) 11515770Swollman errx(EX_OSERR, "null filesystem is not available"); 1162999Swollman 11715770Swollman if (mount(vfc->vfc_index, argv[1], mntflags, &args)) 11815770Swollman err(EX_OSERR, target); 1191558Srgrimes exit(0); 1201558Srgrimes} 1211558Srgrimes 1221558Srgrimesint 1231558Srgrimessubdir(p, dir) 1241558Srgrimes const char *p; 1251558Srgrimes const char *dir; 1261558Srgrimes{ 1271558Srgrimes int l; 1281558Srgrimes 1291558Srgrimes l = strlen(dir); 1301558Srgrimes if (l <= 1) 1311558Srgrimes return (1); 1321558Srgrimes 1331558Srgrimes if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0')) 1341558Srgrimes return (1); 1351558Srgrimes 1361558Srgrimes return (0); 1371558Srgrimes} 1381558Srgrimes 13915770Swollmanstatic void 1401558Srgrimesusage() 1411558Srgrimes{ 1421558Srgrimes (void)fprintf(stderr, 1431558Srgrimes "usage: mount_null [-o options] target_fs mount_point\n"); 1441558Srgrimes exit(1); 1451558Srgrimes} 146