17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*39c23413Seschrock  * Common Development and Distribution License (the "License").
6*39c23413Seschrock  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
217c478bd9Sstevel@tonic-gate /*
22*39c23413Seschrock  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
237c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
247c478bd9Sstevel@tonic-gate  */
257c478bd9Sstevel@tonic-gate 
267c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
277c478bd9Sstevel@tonic-gate 
287c478bd9Sstevel@tonic-gate #include <dirent.h>
297c478bd9Sstevel@tonic-gate #include <stdlib.h>
307c478bd9Sstevel@tonic-gate #include <stdio.h>
317c478bd9Sstevel@tonic-gate #include <string.h>
327c478bd9Sstevel@tonic-gate #include <synch.h>
337c478bd9Sstevel@tonic-gate #include <unistd.h>
347c478bd9Sstevel@tonic-gate #include <sys/errno.h>
357c478bd9Sstevel@tonic-gate #include <sys/types.h>
367c478bd9Sstevel@tonic-gate #include <sys/stat.h>
377c478bd9Sstevel@tonic-gate #include <sys/vfstab.h>
387c478bd9Sstevel@tonic-gate #include <fcntl.h>
397c478bd9Sstevel@tonic-gate #include <sys/wait.h>
407c478bd9Sstevel@tonic-gate #include <sys/fs/ufs_fs.h>
417c478bd9Sstevel@tonic-gate 
427c478bd9Sstevel@tonic-gate #include "libdiskmgt.h"
437c478bd9Sstevel@tonic-gate #include "disks_private.h"
447c478bd9Sstevel@tonic-gate 
457c478bd9Sstevel@tonic-gate /*
467c478bd9Sstevel@tonic-gate  * The list of filesystem heuristic programs.
477c478bd9Sstevel@tonic-gate  */
487c478bd9Sstevel@tonic-gate struct heuristic {
497c478bd9Sstevel@tonic-gate 	struct heuristic	*next;
507c478bd9Sstevel@tonic-gate 	char			*prog;
517c478bd9Sstevel@tonic-gate 	char			*type;
527c478bd9Sstevel@tonic-gate };
537c478bd9Sstevel@tonic-gate 
547c478bd9Sstevel@tonic-gate struct vfstab_list {
557c478bd9Sstevel@tonic-gate 	char	*special;
567c478bd9Sstevel@tonic-gate 	char	*mountp;
577c478bd9Sstevel@tonic-gate 	struct vfstab_list 	*next;
587c478bd9Sstevel@tonic-gate };
597c478bd9Sstevel@tonic-gate 
607c478bd9Sstevel@tonic-gate static struct vfstab_list	*vfstab_listp = NULL;
617c478bd9Sstevel@tonic-gate static	mutex_t	vfstab_lock = DEFAULTMUTEX;
627c478bd9Sstevel@tonic-gate 
637c478bd9Sstevel@tonic-gate static	time_t	timestamp = 0;
647c478bd9Sstevel@tonic-gate 
657c478bd9Sstevel@tonic-gate static struct heuristic	*hlist = NULL;
667c478bd9Sstevel@tonic-gate static int		initialized = 0;
677c478bd9Sstevel@tonic-gate static mutex_t		init_lock = DEFAULTMUTEX;
687c478bd9Sstevel@tonic-gate 
697c478bd9Sstevel@tonic-gate static int	has_fs(char *prog, char *slice);
707c478bd9Sstevel@tonic-gate static int	load_heuristics();
717c478bd9Sstevel@tonic-gate static int	add_use_record(struct vfstab *vp);
727c478bd9Sstevel@tonic-gate static int	load_vfstab();
737c478bd9Sstevel@tonic-gate static void	free_vfstab(struct vfstab_list *listp);
747c478bd9Sstevel@tonic-gate 
757c478bd9Sstevel@tonic-gate /*
767c478bd9Sstevel@tonic-gate  * Use the heuristics to check for a filesystem on the slice.
777c478bd9Sstevel@tonic-gate  */
787c478bd9Sstevel@tonic-gate int
inuse_fs(char * slice,nvlist_t * attrs,int * errp)797c478bd9Sstevel@tonic-gate inuse_fs(char *slice, nvlist_t *attrs, int *errp)
807c478bd9Sstevel@tonic-gate {
817c478bd9Sstevel@tonic-gate 	struct 	heuristic	*hp;
827c478bd9Sstevel@tonic-gate 	time_t	curr_time;
837c478bd9Sstevel@tonic-gate 	int	found = 0;
847c478bd9Sstevel@tonic-gate 
857c478bd9Sstevel@tonic-gate 
867c478bd9Sstevel@tonic-gate 	*errp = 0;
877c478bd9Sstevel@tonic-gate 
887c478bd9Sstevel@tonic-gate 	if (slice == NULL) {
897c478bd9Sstevel@tonic-gate 	    return (0);
907c478bd9Sstevel@tonic-gate 	}
917c478bd9Sstevel@tonic-gate 
927c478bd9Sstevel@tonic-gate 	/*
937c478bd9Sstevel@tonic-gate 	 * We get the list of heuristic programs one time.
947c478bd9Sstevel@tonic-gate 	 */
957c478bd9Sstevel@tonic-gate 	(void) mutex_lock(&init_lock);
967c478bd9Sstevel@tonic-gate 	if (!initialized) {
977c478bd9Sstevel@tonic-gate 	    *errp = load_heuristics();
987c478bd9Sstevel@tonic-gate 
997c478bd9Sstevel@tonic-gate 	    if (*errp == 0) {
1007c478bd9Sstevel@tonic-gate 		initialized = 1;
1017c478bd9Sstevel@tonic-gate 	    }
1027c478bd9Sstevel@tonic-gate 	}
1037c478bd9Sstevel@tonic-gate 	(void) mutex_unlock(&init_lock);
1047c478bd9Sstevel@tonic-gate 
1057c478bd9Sstevel@tonic-gate 	/* Run each of the heuristics. */
1067c478bd9Sstevel@tonic-gate 	for (hp = hlist; hp; hp = hp->next) {
1077c478bd9Sstevel@tonic-gate 	    if (has_fs(hp->prog, slice)) {
1087c478bd9Sstevel@tonic-gate 		libdiskmgt_add_str(attrs, DM_USED_BY, DM_USE_FS, errp);
1097c478bd9Sstevel@tonic-gate 		libdiskmgt_add_str(attrs, DM_USED_NAME, hp->type, errp);
1107c478bd9Sstevel@tonic-gate 		found = 1;
1117c478bd9Sstevel@tonic-gate 	    }
1127c478bd9Sstevel@tonic-gate 	}
1137c478bd9Sstevel@tonic-gate 
1147c478bd9Sstevel@tonic-gate 	if (*errp != 0)
1157c478bd9Sstevel@tonic-gate 		return (found);
1167c478bd9Sstevel@tonic-gate 
1177c478bd9Sstevel@tonic-gate 	/*
1187c478bd9Sstevel@tonic-gate 	 * Second heuristic used is the check for an entry in vfstab
1197c478bd9Sstevel@tonic-gate 	 */
1207c478bd9Sstevel@tonic-gate 
1217c478bd9Sstevel@tonic-gate 	(void) mutex_lock(&vfstab_lock);
1227c478bd9Sstevel@tonic-gate 	curr_time = time(NULL);
1237c478bd9Sstevel@tonic-gate 
1247c478bd9Sstevel@tonic-gate 	if (timestamp < curr_time && (curr_time - timestamp) > 60) {
1257c478bd9Sstevel@tonic-gate 		free_vfstab(vfstab_listp);
1267c478bd9Sstevel@tonic-gate 		*errp = load_vfstab();
1277c478bd9Sstevel@tonic-gate 		timestamp = curr_time;
1287c478bd9Sstevel@tonic-gate 	}
1297c478bd9Sstevel@tonic-gate 
1307c478bd9Sstevel@tonic-gate 	if (*errp == 0) {
1317c478bd9Sstevel@tonic-gate 	    struct vfstab_list	*listp;
1327c478bd9Sstevel@tonic-gate 	    listp = vfstab_listp;
1337c478bd9Sstevel@tonic-gate 
1347c478bd9Sstevel@tonic-gate 	    while (listp != NULL) {
1357c478bd9Sstevel@tonic-gate 		if (strcmp(slice, listp->special) == 0) {
1367c478bd9Sstevel@tonic-gate 		    char *mountp = "";
1377c478bd9Sstevel@tonic-gate 
1387c478bd9Sstevel@tonic-gate 		    if (listp->mountp != NULL)
1397c478bd9Sstevel@tonic-gate 			mountp = listp->mountp;
1407c478bd9Sstevel@tonic-gate 
1417c478bd9Sstevel@tonic-gate 		    libdiskmgt_add_str(attrs, DM_USED_BY, DM_USE_VFSTAB, errp);
1427c478bd9Sstevel@tonic-gate 		    libdiskmgt_add_str(attrs, DM_USED_NAME, mountp, errp);
1437c478bd9Sstevel@tonic-gate 		    found = 1;
1447c478bd9Sstevel@tonic-gate 		}
1457c478bd9Sstevel@tonic-gate 		listp = listp->next;
1467c478bd9Sstevel@tonic-gate 	    }
1477c478bd9Sstevel@tonic-gate 	}
1487c478bd9Sstevel@tonic-gate 	(void) mutex_unlock(&vfstab_lock);
1497c478bd9Sstevel@tonic-gate 	return (found);
1507c478bd9Sstevel@tonic-gate }
1517c478bd9Sstevel@tonic-gate 
1527c478bd9Sstevel@tonic-gate static int
has_fs(char * prog,char * slice)1537c478bd9Sstevel@tonic-gate has_fs(char *prog, char *slice)
1547c478bd9Sstevel@tonic-gate {
1557c478bd9Sstevel@tonic-gate 	pid_t	pid;
1567c478bd9Sstevel@tonic-gate 	int	loc;
1577c478bd9Sstevel@tonic-gate 	mode_t	mode = S_IRUSR | S_IWUSR;
1587c478bd9Sstevel@tonic-gate 
1597c478bd9Sstevel@tonic-gate 	switch ((pid = fork1())) {
1607c478bd9Sstevel@tonic-gate 	case 0:
1617c478bd9Sstevel@tonic-gate 	    /* child process */
1627c478bd9Sstevel@tonic-gate 
1637c478bd9Sstevel@tonic-gate 	    closefrom(1);
1647c478bd9Sstevel@tonic-gate 	    (void) open("/dev/null", O_WRONLY, mode);
1657c478bd9Sstevel@tonic-gate 	    (void) open("/dev/null", O_WRONLY, mode);
1667c478bd9Sstevel@tonic-gate 	    (void) execl(prog, "fstyp", slice, NULL);
1677c478bd9Sstevel@tonic-gate 	    _exit(1);
1687c478bd9Sstevel@tonic-gate 	    break;
1697c478bd9Sstevel@tonic-gate 
1707c478bd9Sstevel@tonic-gate 	case -1:
1717c478bd9Sstevel@tonic-gate 	    return (0);
1727c478bd9Sstevel@tonic-gate 
1737c478bd9Sstevel@tonic-gate 	default:
1747c478bd9Sstevel@tonic-gate 	    /* parent process */
1757c478bd9Sstevel@tonic-gate 	    break;
1767c478bd9Sstevel@tonic-gate 	}
1777c478bd9Sstevel@tonic-gate 
1787c478bd9Sstevel@tonic-gate 	(void) waitpid(pid, &loc, 0);
1797c478bd9Sstevel@tonic-gate 
1807c478bd9Sstevel@tonic-gate 	if (WIFEXITED(loc) && WEXITSTATUS(loc) == 0) {
1817c478bd9Sstevel@tonic-gate 	    return (1);
1827c478bd9Sstevel@tonic-gate 	}
1837c478bd9Sstevel@tonic-gate 
1847c478bd9Sstevel@tonic-gate 	return (0);
1857c478bd9Sstevel@tonic-gate }
1867c478bd9Sstevel@tonic-gate 
1877c478bd9Sstevel@tonic-gate /*
1887c478bd9Sstevel@tonic-gate  * Create a list of filesystem heuristic programs.
1897c478bd9Sstevel@tonic-gate  */
1907c478bd9Sstevel@tonic-gate static int
load_heuristics()1917c478bd9Sstevel@tonic-gate load_heuristics()
1927c478bd9Sstevel@tonic-gate {
1937c478bd9Sstevel@tonic-gate 	DIR	*dirp;
1947c478bd9Sstevel@tonic-gate 
1957c478bd9Sstevel@tonic-gate 	if ((dirp = opendir("/usr/lib/fs")) != NULL) {
1967c478bd9Sstevel@tonic-gate 	    struct dirent   *dp;
1977c478bd9Sstevel@tonic-gate 
1987c478bd9Sstevel@tonic-gate 	    while ((dp = readdir(dirp)) != NULL) {
1997c478bd9Sstevel@tonic-gate 		char		path[MAXPATHLEN];
2007c478bd9Sstevel@tonic-gate 		struct stat	buf;
2017c478bd9Sstevel@tonic-gate 		DIR		*subdirp;
2027c478bd9Sstevel@tonic-gate 
2037c478bd9Sstevel@tonic-gate 		/* skip known dirs */
2047c478bd9Sstevel@tonic-gate 		if (strcmp(dp->d_name, ".") == 0 ||
2057c478bd9Sstevel@tonic-gate 		    strcmp(dp->d_name, "..") == 0) {
2067c478bd9Sstevel@tonic-gate 		    continue;
2077c478bd9Sstevel@tonic-gate 		}
2087c478bd9Sstevel@tonic-gate 
209*39c23413Seschrock 		/*
210*39c23413Seschrock 		 * Skip checking for ZFS filesystems.  We know that
211*39c23413Seschrock 		 * inuse_zpool() will have already been called, which does a
212*39c23413Seschrock 		 * better job of checking anyway.  More importantly, an unused
213*39c23413Seschrock 		 * hot spare will still claim to have a ZFS filesystem because
214*39c23413Seschrock 		 * it doesn't do the same level of checks.
215*39c23413Seschrock 		 */
216*39c23413Seschrock 		if (strcmp(dp->d_name, "zfs") == 0)
217*39c23413Seschrock 			continue;
218*39c23413Seschrock 
2197c478bd9Sstevel@tonic-gate 		(void) snprintf(path, sizeof (path), "/usr/lib/fs/%s",
2207c478bd9Sstevel@tonic-gate 		    dp->d_name);
2217c478bd9Sstevel@tonic-gate 
2224bc0a2efScasper 		if (stat(path, &buf) != 0 || !S_ISDIR(buf.st_mode)) {
2237c478bd9Sstevel@tonic-gate 		    continue;
2247c478bd9Sstevel@tonic-gate 		}
2257c478bd9Sstevel@tonic-gate 
2267c478bd9Sstevel@tonic-gate 		if ((subdirp = opendir(path)) != NULL) {
2277c478bd9Sstevel@tonic-gate 		    struct dirent   *sdp;
2287c478bd9Sstevel@tonic-gate 
2297c478bd9Sstevel@tonic-gate 		    while ((sdp = readdir(subdirp)) != NULL) {
2307c478bd9Sstevel@tonic-gate 
2317c478bd9Sstevel@tonic-gate 			if (strcmp(sdp->d_name, "fstyp") == 0) {
2327c478bd9Sstevel@tonic-gate 			    char progpath[MAXPATHLEN];
2337c478bd9Sstevel@tonic-gate 
2347c478bd9Sstevel@tonic-gate 			    (void) snprintf(progpath, sizeof (progpath),
2357c478bd9Sstevel@tonic-gate 				"/usr/lib/fs/%s/fstyp", dp->d_name);
2367c478bd9Sstevel@tonic-gate 
2377c478bd9Sstevel@tonic-gate 			    if (stat(progpath, &buf) == 0 &&
2384bc0a2efScasper 				S_ISREG(buf.st_mode)) {
2397c478bd9Sstevel@tonic-gate 
2407c478bd9Sstevel@tonic-gate 				struct heuristic *hp;
2417c478bd9Sstevel@tonic-gate 
2427c478bd9Sstevel@tonic-gate 				hp = (struct heuristic *)
2437c478bd9Sstevel@tonic-gate 				    malloc(sizeof (struct heuristic));
2447c478bd9Sstevel@tonic-gate 
2457c478bd9Sstevel@tonic-gate 				if (hp == NULL) {
2467c478bd9Sstevel@tonic-gate 				    (void) closedir(subdirp);
2477c478bd9Sstevel@tonic-gate 				    (void) closedir(dirp);
2487c478bd9Sstevel@tonic-gate 				    return (ENOMEM);
2497c478bd9Sstevel@tonic-gate 				}
2507c478bd9Sstevel@tonic-gate 
2517c478bd9Sstevel@tonic-gate 				if ((hp->prog = strdup(progpath)) == NULL) {
2527c478bd9Sstevel@tonic-gate 				    (void) closedir(subdirp);
2537c478bd9Sstevel@tonic-gate 				    (void) closedir(dirp);
2547c478bd9Sstevel@tonic-gate 				    return (ENOMEM);
2557c478bd9Sstevel@tonic-gate 				}
2567c478bd9Sstevel@tonic-gate 
2577c478bd9Sstevel@tonic-gate 				if ((hp->type = strdup(dp->d_name)) == NULL) {
2587c478bd9Sstevel@tonic-gate 				    (void) closedir(subdirp);
2597c478bd9Sstevel@tonic-gate 				    (void) closedir(dirp);
2607c478bd9Sstevel@tonic-gate 				    return (ENOMEM);
2617c478bd9Sstevel@tonic-gate 				}
2627c478bd9Sstevel@tonic-gate 
2637c478bd9Sstevel@tonic-gate 				hp->next = hlist;
2647c478bd9Sstevel@tonic-gate 				hlist = hp;
2657c478bd9Sstevel@tonic-gate 			    }
2667c478bd9Sstevel@tonic-gate 
2677c478bd9Sstevel@tonic-gate 			    break;
2687c478bd9Sstevel@tonic-gate 			}
2697c478bd9Sstevel@tonic-gate 		    }
2707c478bd9Sstevel@tonic-gate 
2717c478bd9Sstevel@tonic-gate 		    (void) closedir(subdirp);
2727c478bd9Sstevel@tonic-gate 		}
2737c478bd9Sstevel@tonic-gate 	    }
2747c478bd9Sstevel@tonic-gate 
2757c478bd9Sstevel@tonic-gate 	    (void) closedir(dirp);
2767c478bd9Sstevel@tonic-gate 	}
2777c478bd9Sstevel@tonic-gate 
2787c478bd9Sstevel@tonic-gate 	return (0);
2797c478bd9Sstevel@tonic-gate }
2807c478bd9Sstevel@tonic-gate 
2817c478bd9Sstevel@tonic-gate static int
load_vfstab()2827c478bd9Sstevel@tonic-gate load_vfstab()
2837c478bd9Sstevel@tonic-gate {
2847c478bd9Sstevel@tonic-gate 	FILE	*fp;
2857c478bd9Sstevel@tonic-gate 	struct	vfstab vp;
2867c478bd9Sstevel@tonic-gate 	int	status = 1;
2877c478bd9Sstevel@tonic-gate 
2887c478bd9Sstevel@tonic-gate 	fp = fopen(VFSTAB, "r");
2897c478bd9Sstevel@tonic-gate 	if (fp != NULL) {
2907c478bd9Sstevel@tonic-gate 	    (void) memset(&vp, 0, sizeof (struct vfstab));
2917c478bd9Sstevel@tonic-gate 	    while (getvfsent(fp, &vp) == 0) {
2927c478bd9Sstevel@tonic-gate 		    status = add_use_record(&vp);
2937c478bd9Sstevel@tonic-gate 		    if (status != 0) {
2947c478bd9Sstevel@tonic-gate 			(void) fclose(fp);
2957c478bd9Sstevel@tonic-gate 			return (status);
2967c478bd9Sstevel@tonic-gate 		    }
2977c478bd9Sstevel@tonic-gate 		(void) memset(&vp, 0, sizeof (struct vfstab));
2987c478bd9Sstevel@tonic-gate 	    }
2997c478bd9Sstevel@tonic-gate 	    (void) fclose(fp);
3007c478bd9Sstevel@tonic-gate 	    status = 0;
3017c478bd9Sstevel@tonic-gate 	}
3027c478bd9Sstevel@tonic-gate 
3037c478bd9Sstevel@tonic-gate 	return (status);
3047c478bd9Sstevel@tonic-gate }
3057c478bd9Sstevel@tonic-gate 
3067c478bd9Sstevel@tonic-gate static int
add_use_record(struct vfstab * vp)3077c478bd9Sstevel@tonic-gate add_use_record(struct vfstab *vp)
3087c478bd9Sstevel@tonic-gate {
3097c478bd9Sstevel@tonic-gate 	struct 	vfstab_list	*vfsp;
3107c478bd9Sstevel@tonic-gate 
3117c478bd9Sstevel@tonic-gate 	vfsp = (struct vfstab_list *)malloc(sizeof (struct vfstab_list));
3127c478bd9Sstevel@tonic-gate 	if (vfsp == NULL) {
3137c478bd9Sstevel@tonic-gate 	    return (ENOMEM);
3147c478bd9Sstevel@tonic-gate 	}
3157c478bd9Sstevel@tonic-gate 
3167c478bd9Sstevel@tonic-gate 	vfsp->special = strdup(vp->vfs_special);
3177c478bd9Sstevel@tonic-gate 	if (vfsp->special == NULL) {
3187c478bd9Sstevel@tonic-gate 	    free(vfsp);
3197c478bd9Sstevel@tonic-gate 	    return (ENOMEM);
3207c478bd9Sstevel@tonic-gate 	}
3217c478bd9Sstevel@tonic-gate 
3227c478bd9Sstevel@tonic-gate 	if (vp->vfs_mountp != NULL) {
3237c478bd9Sstevel@tonic-gate 	    vfsp->mountp = strdup(vp->vfs_mountp);
3247c478bd9Sstevel@tonic-gate 	    if (vfsp->mountp == NULL) {
3257c478bd9Sstevel@tonic-gate 		free(vfsp);
3267c478bd9Sstevel@tonic-gate 		return (ENOMEM);
3277c478bd9Sstevel@tonic-gate 	    }
3287c478bd9Sstevel@tonic-gate 	} else {
3297c478bd9Sstevel@tonic-gate 	    vfsp->mountp = NULL;
3307c478bd9Sstevel@tonic-gate 	}
3317c478bd9Sstevel@tonic-gate 
3327c478bd9Sstevel@tonic-gate 	vfsp->next = vfstab_listp;
3337c478bd9Sstevel@tonic-gate 	vfstab_listp = vfsp;
3347c478bd9Sstevel@tonic-gate 
3357c478bd9Sstevel@tonic-gate 	return (0);
3367c478bd9Sstevel@tonic-gate }
3377c478bd9Sstevel@tonic-gate 
3387c478bd9Sstevel@tonic-gate static void
free_vfstab(struct vfstab_list * listp)3397c478bd9Sstevel@tonic-gate free_vfstab(struct vfstab_list *listp)
3407c478bd9Sstevel@tonic-gate {
3417c478bd9Sstevel@tonic-gate 	struct vfstab_list	*nextp;
3427c478bd9Sstevel@tonic-gate 
3437c478bd9Sstevel@tonic-gate 	while (listp != NULL) {
3447c478bd9Sstevel@tonic-gate 	    nextp = listp->next;
3457c478bd9Sstevel@tonic-gate 	    free((void *)listp->special);
3467c478bd9Sstevel@tonic-gate 	    free((void *)listp->mountp);
3477c478bd9Sstevel@tonic-gate 	    free((void *)listp);
3487c478bd9Sstevel@tonic-gate 	    listp = nextp;
3497c478bd9Sstevel@tonic-gate 	}
3507c478bd9Sstevel@tonic-gate 
3517c478bd9Sstevel@tonic-gate 	vfstab_listp = NULL;
3527c478bd9Sstevel@tonic-gate }
353