File:  [DragonFly] / src / sbin / mount / mount.c
Revision 1.6: download - view: text, annotated - select for diffs
Fri Feb 6 22:11:48 2004 UTC (10 years, 2 months ago) by joerg
Branches: MAIN
CVS tags: HEAD, DragonFly_1_0_REL, DragonFly_1_0_RC1, DragonFly_1_0A_REL
Allows option to be specified on the command line when mount with -a.

Patch submitted by Chis Pressey <cpressey@catseye.mine.nu>, backported
from FreeBSD.

    1: /*-
    2:  * Copyright (c) 1980, 1989, 1993, 1994
    3:  *	The Regents of the University of California.  All rights reserved.
    4:  *
    5:  * Redistribution and use in source and binary forms, with or without
    6:  * modification, are permitted provided that the following conditions
    7:  * are met:
    8:  * 1. Redistributions of source code must retain the above copyright
    9:  *    notice, this list of conditions and the following disclaimer.
   10:  * 2. Redistributions in binary form must reproduce the above copyright
   11:  *    notice, this list of conditions and the following disclaimer in the
   12:  *    documentation and/or other materials provided with the distribution.
   13:  * 3. All advertising materials mentioning features or use of this software
   14:  *    must display the following acknowledgement:
   15:  *	This product includes software developed by the University of
   16:  *	California, Berkeley and its contributors.
   17:  * 4. Neither the name of the University nor the names of its contributors
   18:  *    may be used to endorse or promote products derived from this software
   19:  *    without specific prior written permission.
   20:  *
   21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31:  * SUCH DAMAGE.
   32:  *
   33:  * @(#) Copyright (c) 1980, 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
   34:  * @(#)mount.c	8.25 (Berkeley) 5/8/95
   35:  * $FreeBSD: src/sbin/mount/mount.c,v 1.39.2.3 2001/08/01 08:26:23 obrien Exp $
   36:  * $DragonFly: src/sbin/mount/mount.c,v 1.6 2004/02/06 22:11:48 joerg Exp $
   37:  */
   38: 
   39: #include <sys/param.h>
   40: #include <sys/mount.h>
   41: #include <sys/stat.h>
   42: #include <sys/wait.h>
   43: 
   44: #include <err.h>
   45: #include <errno.h>
   46: #include <fstab.h>
   47: #include <pwd.h>
   48: #include <signal.h>
   49: #include <stdio.h>
   50: #include <stdlib.h>
   51: #include <string.h>
   52: #include <unistd.h>
   53: 
   54: #include "extern.h"
   55: #include "mntopts.h"
   56: #include "pathnames.h"
   57: 
   58: /* `meta' options */
   59: #define MOUNT_META_OPTION_FSTAB		"fstab"	
   60: #define MOUNT_META_OPTION_CURRENT	"current"
   61: 
   62: int debug, fstab_style, verbose;
   63: 
   64: char   *catopt(char *, const char *);
   65: struct statfs
   66:        *getmntpt(const char *);
   67: int	hasopt(const char *, const char *);
   68: int	ismounted(struct fstab *, struct statfs *, int);
   69: int	isremountable(const char *);
   70: void	mangle(char *, int *, const char **);
   71: char   *update_options(char *, char *, int);
   72: int	mountfs(const char *, const char *, const char *,
   73: 			int, const char *, const char *);
   74: void	remopt(char *, const char *);
   75: void	prmount(struct statfs *);
   76: void	putfsent(const struct statfs *);
   77: void	usage(void);
   78: char   *flags2opts(int);
   79: 
   80: /* Map from mount options to printable formats. */
   81: static struct opt {
   82: 	int o_opt;
   83: 	const char *o_name;
   84: } optnames[] = {
   85: 	{ MNT_ASYNC,		"asynchronous" },
   86: 	{ MNT_EXPORTED,		"NFS exported" },
   87: 	{ MNT_LOCAL,		"local" },
   88: 	{ MNT_NOATIME,		"noatime" },
   89: 	{ MNT_NODEV,		"nodev" },
   90: 	{ MNT_NOEXEC,		"noexec" },
   91: 	{ MNT_NOSUID,		"nosuid" },
   92: 	{ MNT_NOSYMFOLLOW,	"nosymfollow" },
   93: 	{ MNT_QUOTA,		"with quotas" },
   94: 	{ MNT_RDONLY,		"read-only" },
   95: 	{ MNT_SYNCHRONOUS,	"synchronous" },
   96: 	{ MNT_UNION,		"union" },
   97: 	{ MNT_NOCLUSTERR,	"noclusterr" },
   98: 	{ MNT_NOCLUSTERW,	"noclusterw" },
   99: 	{ MNT_SUIDDIR,		"suiddir" },
  100: 	{ MNT_SOFTDEP,		"soft-updates" },
  101: 	{ 0, NULL }
  102: };
  103: 
  104: /*
  105:  * List of VFS types that can be remounted without becoming mounted on top
  106:  * of each other.
  107:  * XXX Is this list correct?
  108:  */
  109: static const char *
  110: remountable_fs_names[] = {
  111: 	"ufs", "ffs", "ext2fs",
  112: 	0
  113: };
  114: 
  115: int
  116: main(int argc, char **argv)
  117: {
  118: 	const char *mntfromname, **vfslist, *vfstype;
  119: 	struct fstab *fs;
  120: 	struct statfs *mntbuf;
  121: 	FILE *mountdfp;
  122: 	pid_t pid;
  123: 	int all, ch, i, init_flags, mntsize, rval, have_fstab;
  124: 	char *options;
  125: 
  126: 	all = init_flags = 0;
  127: 	options = NULL;
  128: 	vfslist = NULL;
  129: 	vfstype = "ufs";
  130: 	while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1)
  131: 		switch (ch) {
  132: 		case 'a':
  133: 			all = 1;
  134: 			break;
  135: 		case 'd':
  136: 			debug = 1;
  137: 			break;
  138: 		case 'f':
  139: 			init_flags |= MNT_FORCE;
  140: 			break;
  141: 		case 'o':
  142: 			if (*optarg)
  143: 				options = catopt(options, optarg);
  144: 			break;
  145: 		case 'p':
  146: 			fstab_style = 1;
  147: 			verbose = 1;
  148: 			break;
  149: 		case 'r':
  150: 			options = catopt(options, "ro");
  151: 			break;
  152: 		case 't':
  153: 			if (vfslist != NULL)
  154: 				errx(1, "only one -t option may be specified");
  155: 			vfslist = makevfslist(optarg);
  156: 			vfstype = optarg;
  157: 			break;
  158: 		case 'u':
  159: 			init_flags |= MNT_UPDATE;
  160: 			break;
  161: 		case 'v':
  162: 			verbose = 1;
  163: 			break;
  164: 		case 'w':
  165: 			options = catopt(options, "noro");
  166: 			break;
  167: 		case '?':
  168: 		default:
  169: 			usage();
  170: 			/* NOTREACHED */
  171: 		}
  172: 	argc -= optind;
  173: 	argv += optind;
  174: 
  175: #define	BADTYPE(type)							\
  176: 	(strcmp(type, FSTAB_RO) &&					\
  177: 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
  178: 
  179: 	rval = 0;
  180: 	switch (argc) {
  181: 	case 0:
  182: 		if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
  183: 			err(1, "getmntinfo");
  184: 		if (all) {
  185: 			while ((fs = getfsent()) != NULL) {
  186: 				if (BADTYPE(fs->fs_type))
  187: 					continue;
  188: 				if (checkvfsname(fs->fs_vfstype, vfslist))
  189: 					continue;
  190: 				if (hasopt(fs->fs_mntops, "noauto"))
  191: 					continue;
  192: 				if (!(init_flags & MNT_UPDATE) &&
  193: 				    ismounted(fs, mntbuf, mntsize))
  194: 					continue;
  195: 				options = update_options(options,
  196: 				    fs->fs_mntops, mntbuf->f_flags);
  197: 				if (mountfs(fs->fs_vfstype, fs->fs_spec,
  198: 				    fs->fs_file, init_flags, options,
  199: 				    fs->fs_mntops))
  200: 					rval = 1;
  201: 			}
  202: 		} else if (fstab_style) {
  203: 			for (i = 0; i < mntsize; i++) {
  204: 				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
  205: 					continue;
  206: 				putfsent(&mntbuf[i]);
  207: 			}
  208: 		} else {
  209: 			for (i = 0; i < mntsize; i++) {
  210: 				if (checkvfsname(mntbuf[i].f_fstypename,
  211: 				    vfslist))
  212: 					continue;
  213: 				prmount(&mntbuf[i]);
  214: 			}
  215: 		}
  216: 		exit(rval);
  217: 	case 1:
  218: 		if (vfslist != NULL)
  219: 			usage();
  220: 
  221: 		if (init_flags & MNT_UPDATE) {
  222: 			mntfromname = NULL;
  223: 			have_fstab = 0;
  224: 			if ((mntbuf = getmntpt(*argv)) == NULL)
  225: 				errx(1, "not currently mounted %s", *argv);
  226: 			/*
  227: 			 * Only get the mntflags from fstab if both mntpoint
  228: 			 * and mntspec are identical. Also handle the special
  229: 			 * case where just '/' is mounted and 'spec' is not
  230: 			 * identical with the one from fstab ('/dev' is missing
  231: 			 * in the spec-string at boot-time).
  232: 			 */
  233: 			if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
  234: 				if (strcmp(fs->fs_spec,
  235: 				    mntbuf->f_mntfromname) == 0 &&
  236: 				    strcmp(fs->fs_file,
  237: 				    mntbuf->f_mntonname) == 0) {
  238: 					have_fstab = 1;
  239: 					mntfromname = mntbuf->f_mntfromname;
  240: 				} else if (argv[0][0] == '/' &&
  241: 				    argv[0][1] == '\0') {
  242: 					fs = getfsfile("/");
  243: 					have_fstab = 1;
  244: 					mntfromname = fs->fs_spec;
  245: 				}
  246: 			}
  247: 			if (have_fstab) {
  248: 				options = update_options(options, fs->fs_mntops,
  249: 				    mntbuf->f_flags);
  250: 			} else {
  251: 				mntfromname = mntbuf->f_mntfromname;
  252: 				options = update_options(options, NULL,
  253: 				    mntbuf->f_flags);
  254: 			}
  255: 			rval = mountfs(mntbuf->f_fstypename, mntfromname,
  256: 			    mntbuf->f_mntonname, init_flags, options, 0);
  257: 			break;
  258: 		}
  259: 		rmslashes(*argv, *argv);
  260: 		if ((fs = getfsfile(*argv)) == NULL &&
  261: 		    (fs = getfsspec(*argv)) == NULL)
  262: 			errx(1, "%s: unknown special file or file system",
  263: 			    *argv);
  264: 		if (BADTYPE(fs->fs_type))
  265: 			errx(1, "%s has unknown file system type",
  266: 			    *argv);
  267: 		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
  268: 		    init_flags, options, fs->fs_mntops);
  269: 		break;
  270: 	case 2:
  271: 		/*
  272: 		 * If -t flag has not been specified, the path cannot be
  273: 		 * found, spec contains either a ':' or a '@', and the
  274: 		 * spec is not a file with those characters, then assume
  275: 		 * that an NFS filesystem is being specified ala Sun.
  276: 		 */
  277: 		if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL &&
  278: 		    access(argv[0], 0) == -1)
  279: 			vfstype = "nfs";
  280: 		rval = mountfs(vfstype,
  281: 		    argv[0], argv[1], init_flags, options, NULL);
  282: 		break;
  283: 	default:
  284: 		usage();
  285: 		/* NOTREACHED */
  286: 	}
  287: 
  288: 	/*
  289: 	 * If the mount was successfully, and done by root, tell mountd the
  290: 	 * good news.  Pid checks are probably unnecessary, but don't hurt.
  291: 	 */
  292: 	if (rval == 0 && getuid() == 0 &&
  293: 	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
  294: 		if (fscanf(mountdfp, "%d", &pid) == 1 &&
  295: 		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
  296: 			err(1, "signal mountd");
  297: 		(void)fclose(mountdfp);
  298: 	}
  299: 
  300: 	exit(rval);
  301: }
  302: 
  303: int
  304: ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
  305: {
  306: 	int i;
  307: 
  308: 	if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
  309: 		/* the root file system can always be remounted */
  310: 		return (0);
  311: 
  312: 	for (i = mntsize - 1; i >= 0; --i)
  313: 		if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
  314: 		    (!isremountable(fs->fs_vfstype) ||
  315: 		     strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
  316: 			return (1);
  317: 	return (0);
  318: }
  319: 
  320: int
  321: isremountable(const char *vfsname)
  322: {
  323: 	const char **cp;
  324: 
  325: 	for (cp = remountable_fs_names; *cp; cp++)
  326: 		if (strcmp(*cp, vfsname) == 0)
  327: 			return (1);
  328: 	return (0);
  329: }
  330: 
  331: int
  332: hasopt(const char *mntopts, const char *option)
  333: {
  334: 	int negative, found;
  335: 	char *opt, *optbuf;
  336: 
  337: 	if (option[0] == 'n' && option[1] == 'o') {
  338: 		negative = 1;
  339: 		option += 2;
  340: 	} else
  341: 		negative = 0;
  342: 	optbuf = strdup(mntopts);
  343: 	found = 0;
  344: 	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
  345: 		if (opt[0] == 'n' && opt[1] == 'o') {
  346: 			if (!strcasecmp(opt + 2, option))
  347: 				found = negative;
  348: 		} else if (!strcasecmp(opt, option))
  349: 			found = !negative;
  350: 	}
  351: 	free(optbuf);
  352: 	return (found);
  353: }
  354: 
  355: int
  356: mountfs(const char *vfstype, const char *spec, const char *name, int flags,
  357:         const char *options, const char *mntopts)
  358: {
  359: 	/* List of directories containing mount_xxx subcommands. */
  360: 	static const char *edirs[] = {
  361: 		_PATH_SBIN,
  362: 		_PATH_USRSBIN,
  363: 		NULL
  364: 	};
  365: 	const char *argv[100], **edir;
  366: 	struct statfs sf;
  367: 	pid_t pid;
  368: 	int argc, i, status;
  369: 	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
  370: 
  371: #if __GNUC__
  372: 	(void)&optbuf;
  373: 	(void)&name;
  374: #endif
  375: 
  376: 	/* resolve the mountpoint with realpath(3) */
  377: 	(void)checkpath(name, mntpath);
  378: 	name = mntpath;
  379: 
  380: 	if (mntopts == NULL)
  381: 		mntopts = "";
  382: 	if (options == NULL) {
  383: 		if (*mntopts == '\0') {
  384: 			options = "rw";
  385: 		} else {
  386: 			options = mntopts;
  387: 			mntopts = "";
  388: 		}
  389: 	}
  390: 	optbuf = catopt(strdup(mntopts), options);
  391: 
  392: 	if (strcmp(name, "/") == 0)
  393: 		flags |= MNT_UPDATE;
  394: 	if (flags & MNT_FORCE)
  395: 		optbuf = catopt(optbuf, "force");
  396: 	if (flags & MNT_RDONLY)
  397: 		optbuf = catopt(optbuf, "ro");
  398: 	/*
  399: 	 * XXX
  400: 	 * The mount_mfs (newfs) command uses -o to select the
  401: 	 * optimization mode.  We don't pass the default "-o rw"
  402: 	 * for that reason.
  403: 	 */
  404: 	if (flags & MNT_UPDATE)
  405: 		optbuf = catopt(optbuf, "update");
  406: 
  407: 	argc = 0;
  408: 	argv[argc++] = vfstype;
  409: 	mangle(optbuf, &argc, argv);
  410: 	argv[argc++] = spec;
  411: 	argv[argc++] = name;
  412: 	argv[argc] = NULL;
  413: 
  414: 	if (debug) {
  415: 		(void)printf("exec: mount_%s", vfstype);
  416: 		for (i = 1; i < argc; i++)
  417: 			(void)printf(" %s", argv[i]);
  418: 		(void)printf("\n");
  419: 		return (0);
  420: 	}
  421: 
  422: 	switch (pid = fork()) {
  423: 	case -1:				/* Error. */
  424: 		warn("fork");
  425: 		free(optbuf);
  426: 		return (1);
  427: 	case 0:					/* Child. */
  428: 		if (strcmp(vfstype, "ufs") == 0)
  429: 			exit(mount_ufs(argc, (char * const *) argv));
  430: 
  431: 		/* Go find an executable. */
  432: 		for (edir = edirs; *edir; edir++) {
  433: 			(void)snprintf(execname,
  434: 			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
  435: 			execv(execname, (char * const *)argv);
  436: 		}
  437: 		if (errno == ENOENT) {
  438: 			int len = 0;
  439: 			char *cp;
  440: 			for (edir = edirs; *edir; edir++)
  441: 				len += strlen(*edir) + 2;	/* ", " */
  442: 			if ((cp = malloc(len)) == NULL)
  443: 				errx(1, "malloc failed");
  444: 			cp[0] = '\0';
  445: 			for (edir = edirs; *edir; edir++) {
  446: 				strcat(cp, *edir);
  447: 				if (edir[1] != NULL)
  448: 					strcat(cp, ", ");
  449: 			}
  450: 			warn("exec mount_%s not found in %s", vfstype, cp);
  451: 		}
  452: 		exit(1);
  453: 		/* NOTREACHED */
  454: 	default:				/* Parent. */
  455: 		free(optbuf);
  456: 
  457: 		if (waitpid(pid, &status, 0) < 0) {
  458: 			warn("waitpid");
  459: 			return (1);
  460: 		}
  461: 
  462: 		if (WIFEXITED(status)) {
  463: 			if (WEXITSTATUS(status) != 0)
  464: 				return (WEXITSTATUS(status));
  465: 		} else if (WIFSIGNALED(status)) {
  466: 			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
  467: 			return (1);
  468: 		}
  469: 
  470: 		if (verbose) {
  471: 			if (statfs(name, &sf) < 0) {
  472: 				warn("statfs %s", name);
  473: 				return (1);
  474: 			}
  475: 			if (fstab_style)
  476: 				putfsent(&sf);
  477: 			else
  478: 				prmount(&sf);
  479: 		}
  480: 		break;
  481: 	}
  482: 
  483: 	return (0);
  484: }
  485: 
  486: void
  487: prmount(struct statfs *sfp)
  488: {
  489: 	int flags;
  490: 	struct opt *o;
  491: 	struct passwd *pw;
  492: 
  493: 	(void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
  494: 	    sfp->f_fstypename);
  495: 
  496: 	flags = sfp->f_flags & MNT_VISFLAGMASK;
  497: 	for (o = optnames; flags && o->o_opt; o++)
  498: 		if (flags & o->o_opt) {
  499: 			(void)printf(", %s", o->o_name);
  500: 			flags &= ~o->o_opt;
  501: 		}
  502: 	if (sfp->f_owner) {
  503: 		(void)printf(", mounted by ");
  504: 		if ((pw = getpwuid(sfp->f_owner)) != NULL)
  505: 			(void)printf("%s", pw->pw_name);
  506: 		else
  507: 			(void)printf("%d", sfp->f_owner);
  508: 	}
  509: 	if (verbose) {
  510: 		if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
  511: 			(void)printf(", writes: sync %ld async %ld",
  512: 			    sfp->f_syncwrites, sfp->f_asyncwrites);
  513: 		if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
  514: 			(void)printf(", reads: sync %ld async %ld",
  515: 			    sfp->f_syncreads, sfp->f_asyncreads);
  516: 	}
  517: 	(void)printf(")\n");
  518: }
  519: 
  520: struct statfs *
  521: getmntpt(const char *name)
  522: {
  523: 	struct statfs *mntbuf;
  524: 	int i, mntsize;
  525: 
  526: 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
  527: 	for (i = mntsize - 1; i >= 0; i--) {
  528: 		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
  529: 		    strcmp(mntbuf[i].f_mntonname, name) == 0)
  530: 			return (&mntbuf[i]);
  531: 	}
  532: 	return (NULL);
  533: }
  534: 
  535: char *
  536: catopt(char *s0, const char *s1)
  537: {
  538: 	size_t i;
  539: 	char *cp;
  540: 
  541: 	if (s1 == NULL || *s1 == '\0')
  542: 		return s0;
  543: 
  544: 	if (s0 && *s0) {
  545: 		i = strlen(s0) + strlen(s1) + 1 + 1;
  546: 		if ((cp = malloc(i)) == NULL)
  547: 			errx(1, "malloc failed");
  548: 		(void)snprintf(cp, i, "%s,%s", s0, s1);
  549: 	} else
  550: 		cp = strdup(s1);
  551: 
  552: 	if (s0)
  553: 		free(s0);
  554: 	return (cp);
  555: }
  556: 
  557: void
  558: mangle(char *options, int *argcp, const char **argv)
  559: {
  560: 	char *p, *s;
  561: 	int argc;
  562: 
  563: 	argc = *argcp;
  564: 	for (s = options; (p = strsep(&s, ",")) != NULL;)
  565: 		if (*p != '\0') {
  566: 			if (*p == '-') {
  567: 				argv[argc++] = p;
  568: 				p = strchr(p, '=');
  569: 				if (p) {
  570: 					*p = '\0';
  571: 					argv[argc++] = p+1;
  572: 				}
  573: 			} else if (strcmp(p, "rw") != 0) {
  574: 				argv[argc++] = "-o";
  575: 				argv[argc++] = p;
  576: 			}
  577: 		}
  578: 
  579: 	*argcp = argc;
  580: }
  581: 
  582: 
  583: char *
  584: update_options(char *opts, char *fstab, int curflags)
  585: {
  586: 	char *o, *p;
  587: 	char *cur;
  588: 	char *expopt, *newopt, *tmpopt;
  589: 
  590: 	if (opts == NULL)
  591: 		return strdup("");
  592: 
  593: 	/* remove meta options from list */
  594: 	remopt(fstab, MOUNT_META_OPTION_FSTAB);
  595: 	remopt(fstab, MOUNT_META_OPTION_CURRENT);
  596: 	cur = flags2opts(curflags);
  597: 
  598: 	/*
  599: 	 * Expand all meta-options passed to us first.
  600: 	 */
  601: 	expopt = NULL;
  602: 	for (p = opts; (o = strsep(&p, ",")) != NULL;) {
  603: 		if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
  604: 			expopt = catopt(expopt, fstab);
  605: 		else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
  606: 			expopt = catopt(expopt, cur);
  607: 		else
  608: 			expopt = catopt(expopt, o);
  609: 	}
  610: 	free(cur);
  611: 	free(opts);
  612: 
  613: 	/*
  614: 	 * Remove previous contradictory arguments. Given option "foo" we
  615: 	 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
  616: 	 * and "foo" - so we can deal with possible options like "notice".
  617: 	 */
  618: 	newopt = NULL;
  619: 	for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
  620: 		if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
  621: 			errx(1, "malloc failed");
  622: 	
  623: 		strcpy(tmpopt, "no");
  624: 		strcat(tmpopt, o);
  625: 		remopt(newopt, tmpopt);
  626: 		free(tmpopt);
  627: 
  628: 		if (strncmp("no", o, 2) == 0)
  629: 			remopt(newopt, o+2);
  630: 
  631: 		newopt = catopt(newopt, o);
  632: 	}
  633: 	free(expopt);
  634: 
  635: 	return newopt;
  636: }
  637: 
  638: void
  639: remopt(char *string, const char *opt)
  640: {
  641: 	char *o, *p, *r;
  642: 
  643: 	if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
  644: 		return;
  645: 
  646: 	r = string;
  647: 
  648: 	for (p = string; (o = strsep(&p, ",")) != NULL;) {
  649: 		if (strcmp(opt, o) != 0) {
  650: 			if (*r == ',' && *o != '\0')
  651: 				r++;
  652: 			while ((*r++ = *o++) != '\0')
  653: 			    ;
  654: 			*--r = ',';
  655: 		}
  656: 	}
  657: 	*r = '\0';
  658: }
  659: 
  660: void
  661: usage(void)
  662: {
  663: 
  664: 	(void)fprintf(stderr, "%s\n%s\n%s\n",
  665: "usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node",
  666: "       mount [-adfpruvw] [-o options] [-t ufs | external_type]",
  667: "       mount [-dfpruvw] special | node");
  668: 	exit(1);
  669: }
  670: 
  671: void
  672: putfsent(const struct statfs *ent)
  673: {
  674: 	struct fstab *fst;
  675: 	char *opts;
  676:   
  677: 	opts = flags2opts(ent->f_flags);
  678: 	printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
  679: 	    ent->f_fstypename, opts);
  680: 	free(opts);
  681: 
  682: 	if ((fst = getfsspec(ent->f_mntfromname)))
  683: 		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
  684: 	else if ((fst = getfsfile(ent->f_mntonname)))
  685: 		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
  686: 	else if (strcmp(ent->f_fstypename, "ufs") == 0) {
  687: 		if (strcmp(ent->f_mntonname, "/") == 0)
  688: 			printf("\t1 1\n");
  689: 		else
  690: 			printf("\t2 2\n");
  691: 	} else
  692: 		printf("\t0 0\n");
  693: }
  694: 
  695: 
  696: char *
  697: flags2opts(int flags)
  698: {
  699: 	char *res;
  700: 
  701: 	res = NULL;
  702: 
  703: 	res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
  704: 
  705: 	if (flags & MNT_SYNCHRONOUS)	res = catopt(res, "sync");
  706: 	if (flags & MNT_NOEXEC)		res = catopt(res, "noexec");
  707: 	if (flags & MNT_NOSUID)		res = catopt(res, "nosuid");
  708: 	if (flags & MNT_NODEV)		res = catopt(res, "nodev");
  709: 	if (flags & MNT_UNION)		res = catopt(res, "union");
  710: 	if (flags & MNT_ASYNC)		res = catopt(res, "async");
  711: 	if (flags & MNT_NOATIME)	res = catopt(res, "noatime");
  712: 	if (flags & MNT_NOCLUSTERR)	res = catopt(res, "noclusterr");
  713: 	if (flags & MNT_NOCLUSTERW)	res = catopt(res, "noclusterw");
  714: 	if (flags & MNT_NOSYMFOLLOW)	res = catopt(res, "nosymfollow");
  715: 	if (flags & MNT_SUIDDIR)	res = catopt(res, "suiddir");
  716: 
  717: 	return res;
  718: }