xref: /illumos-gate/usr/src/cmd/stat/common/mnt.c (revision 7c478bd9)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
28*7c478bd9Sstevel@tonic-gate 
29*7c478bd9Sstevel@tonic-gate #include <stdlib.h>
30*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
31*7c478bd9Sstevel@tonic-gate #include <stdio.h>
32*7c478bd9Sstevel@tonic-gate #include <sys/mnttab.h>
33*7c478bd9Sstevel@tonic-gate #include <sys/mntent.h>
34*7c478bd9Sstevel@tonic-gate #include <sys/stat.h>
35*7c478bd9Sstevel@tonic-gate #include <sys/time.h>
36*7c478bd9Sstevel@tonic-gate #include <string.h>
37*7c478bd9Sstevel@tonic-gate #include <fcntl.h>
38*7c478bd9Sstevel@tonic-gate 
39*7c478bd9Sstevel@tonic-gate #include "statcommon.h"
40*7c478bd9Sstevel@tonic-gate #include "dsr.h"
41*7c478bd9Sstevel@tonic-gate 
42*7c478bd9Sstevel@tonic-gate static time_t mtime;
43*7c478bd9Sstevel@tonic-gate mnt_t *nfs;
44*7c478bd9Sstevel@tonic-gate static mnt_t *ufs;
45*7c478bd9Sstevel@tonic-gate 
46*7c478bd9Sstevel@tonic-gate static void build_mnt_list(FILE *);
47*7c478bd9Sstevel@tonic-gate 
48*7c478bd9Sstevel@tonic-gate mnt_t *
lookup_mntent_byname(char * nm)49*7c478bd9Sstevel@tonic-gate lookup_mntent_byname(char *nm)
50*7c478bd9Sstevel@tonic-gate {
51*7c478bd9Sstevel@tonic-gate 	mnt_t *rv = 0;
52*7c478bd9Sstevel@tonic-gate 	mnt_t *minfo;
53*7c478bd9Sstevel@tonic-gate 	uint_t did_nfs;
54*7c478bd9Sstevel@tonic-gate 
55*7c478bd9Sstevel@tonic-gate 
56*7c478bd9Sstevel@tonic-gate 	if (nm) {
57*7c478bd9Sstevel@tonic-gate 		minfo = ufs;
58*7c478bd9Sstevel@tonic-gate 		did_nfs = 0;
59*7c478bd9Sstevel@tonic-gate 		while (minfo) {
60*7c478bd9Sstevel@tonic-gate 			if (strcmp(nm, minfo->device_name)) {
61*7c478bd9Sstevel@tonic-gate 				if (minfo->next != 0)
62*7c478bd9Sstevel@tonic-gate 					minfo = minfo->next;
63*7c478bd9Sstevel@tonic-gate 				else if (did_nfs == 0) {
64*7c478bd9Sstevel@tonic-gate 					minfo = nfs;
65*7c478bd9Sstevel@tonic-gate 					did_nfs = 1;
66*7c478bd9Sstevel@tonic-gate 				}
67*7c478bd9Sstevel@tonic-gate 				else
68*7c478bd9Sstevel@tonic-gate 					minfo = 0;
69*7c478bd9Sstevel@tonic-gate 			} else {
70*7c478bd9Sstevel@tonic-gate 				rv = minfo;
71*7c478bd9Sstevel@tonic-gate 				break;
72*7c478bd9Sstevel@tonic-gate 			}
73*7c478bd9Sstevel@tonic-gate 		}
74*7c478bd9Sstevel@tonic-gate 	}
75*7c478bd9Sstevel@tonic-gate 	return (rv);
76*7c478bd9Sstevel@tonic-gate }
77*7c478bd9Sstevel@tonic-gate 
78*7c478bd9Sstevel@tonic-gate void
do_mnttab(void)79*7c478bd9Sstevel@tonic-gate do_mnttab(void)
80*7c478bd9Sstevel@tonic-gate {
81*7c478bd9Sstevel@tonic-gate 	struct stat 	buf;
82*7c478bd9Sstevel@tonic-gate 	FILE 		*mpt;
83*7c478bd9Sstevel@tonic-gate 	struct flock    lb;
84*7c478bd9Sstevel@tonic-gate 
85*7c478bd9Sstevel@tonic-gate 	if (stat(MNTTAB, &buf) == 0) {
86*7c478bd9Sstevel@tonic-gate 		if (buf.st_mtime != mtime) {
87*7c478bd9Sstevel@tonic-gate 			/*
88*7c478bd9Sstevel@tonic-gate 			 * File has changed. Get the new file.
89*7c478bd9Sstevel@tonic-gate 			 */
90*7c478bd9Sstevel@tonic-gate 			if ((mpt = fopen(MNTTAB, "r"))) {
91*7c478bd9Sstevel@tonic-gate 				lb.l_type = F_RDLCK;
92*7c478bd9Sstevel@tonic-gate 				lb.l_whence = 0;
93*7c478bd9Sstevel@tonic-gate 				lb.l_start = 0;
94*7c478bd9Sstevel@tonic-gate 				lb.l_len = 0;
95*7c478bd9Sstevel@tonic-gate 				(void) fcntl(fileno(mpt), F_SETLKW, &lb);
96*7c478bd9Sstevel@tonic-gate 				build_mnt_list(mpt);
97*7c478bd9Sstevel@tonic-gate 				mtime = buf.st_mtime;
98*7c478bd9Sstevel@tonic-gate 				/*
99*7c478bd9Sstevel@tonic-gate 				 * Lock goes away when we close the file.
100*7c478bd9Sstevel@tonic-gate 				 */
101*7c478bd9Sstevel@tonic-gate 				(void) fclose(mpt);
102*7c478bd9Sstevel@tonic-gate 			}
103*7c478bd9Sstevel@tonic-gate 		}
104*7c478bd9Sstevel@tonic-gate 	}
105*7c478bd9Sstevel@tonic-gate }
106*7c478bd9Sstevel@tonic-gate 
107*7c478bd9Sstevel@tonic-gate static void
build_mnt_list(FILE * mpt)108*7c478bd9Sstevel@tonic-gate build_mnt_list(FILE *mpt)
109*7c478bd9Sstevel@tonic-gate {
110*7c478bd9Sstevel@tonic-gate 	mnt_t *item;
111*7c478bd9Sstevel@tonic-gate 	mnt_t **which;
112*7c478bd9Sstevel@tonic-gate 	mnt_t *tmp;
113*7c478bd9Sstevel@tonic-gate 	int  found;
114*7c478bd9Sstevel@tonic-gate 	struct extmnttab mnt;
115*7c478bd9Sstevel@tonic-gate 
116*7c478bd9Sstevel@tonic-gate 	if (mpt) {
117*7c478bd9Sstevel@tonic-gate 		while (nfs) {
118*7c478bd9Sstevel@tonic-gate 			free(nfs->device_name);
119*7c478bd9Sstevel@tonic-gate 			free(nfs->mount_point);
120*7c478bd9Sstevel@tonic-gate 			free(nfs->devinfo);
121*7c478bd9Sstevel@tonic-gate 			tmp = nfs;
122*7c478bd9Sstevel@tonic-gate 			nfs = nfs->next;
123*7c478bd9Sstevel@tonic-gate 			free(tmp);
124*7c478bd9Sstevel@tonic-gate 		}
125*7c478bd9Sstevel@tonic-gate 		while (ufs) {
126*7c478bd9Sstevel@tonic-gate 			free(ufs->device_name);
127*7c478bd9Sstevel@tonic-gate 			free(ufs->mount_point);
128*7c478bd9Sstevel@tonic-gate 			free(ufs->devinfo);
129*7c478bd9Sstevel@tonic-gate 			tmp = ufs;
130*7c478bd9Sstevel@tonic-gate 			ufs = ufs->next;
131*7c478bd9Sstevel@tonic-gate 			free(tmp);
132*7c478bd9Sstevel@tonic-gate 		}
133*7c478bd9Sstevel@tonic-gate 		(void) memset(&mnt, 0, sizeof (struct extmnttab));
134*7c478bd9Sstevel@tonic-gate 
135*7c478bd9Sstevel@tonic-gate 		resetmnttab(mpt);
136*7c478bd9Sstevel@tonic-gate 		while ((found = getextmntent(mpt, &mnt,
137*7c478bd9Sstevel@tonic-gate 			sizeof (struct extmnttab))) != -1) {
138*7c478bd9Sstevel@tonic-gate 			if (found == 0) {
139*7c478bd9Sstevel@tonic-gate 				if (strcmp(mnt.mnt_fstype, MNTTYPE_UFS) == 0)
140*7c478bd9Sstevel@tonic-gate 					which = &ufs;
141*7c478bd9Sstevel@tonic-gate 				else if (strcmp(mnt.mnt_fstype,
142*7c478bd9Sstevel@tonic-gate 				    MNTTYPE_NFS) == 0)
143*7c478bd9Sstevel@tonic-gate 					which = &nfs;
144*7c478bd9Sstevel@tonic-gate 				else
145*7c478bd9Sstevel@tonic-gate 					which = 0;
146*7c478bd9Sstevel@tonic-gate 				if (which) {
147*7c478bd9Sstevel@tonic-gate 					item = safe_alloc(sizeof (mnt_t));
148*7c478bd9Sstevel@tonic-gate 					item->device_name =
149*7c478bd9Sstevel@tonic-gate 						safe_strdup(mnt.mnt_special);
150*7c478bd9Sstevel@tonic-gate 					item->mount_point =
151*7c478bd9Sstevel@tonic-gate 						safe_strdup(mnt.mnt_mountp);
152*7c478bd9Sstevel@tonic-gate 					item->devinfo =
153*7c478bd9Sstevel@tonic-gate 						safe_strdup(mnt.mnt_mntopts);
154*7c478bd9Sstevel@tonic-gate 					item->minor = mnt.mnt_minor;
155*7c478bd9Sstevel@tonic-gate 					item->next = *which;
156*7c478bd9Sstevel@tonic-gate 					*which = item;
157*7c478bd9Sstevel@tonic-gate 				}
158*7c478bd9Sstevel@tonic-gate 			}
159*7c478bd9Sstevel@tonic-gate 		}
160*7c478bd9Sstevel@tonic-gate 	}
161*7c478bd9Sstevel@tonic-gate }
162