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 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include <stdlib.h>
30 #include <sys/types.h>
31 #include <stdio.h>
32 #include <sys/mnttab.h>
33 #include <sys/mntent.h>
34 #include <sys/stat.h>
35 #include <sys/time.h>
36 #include <string.h>
37 #include <fcntl.h>
38
39 #include "statcommon.h"
40 #include "dsr.h"
41
42 static time_t mtime;
43 mnt_t *nfs;
44 static mnt_t *ufs;
45
46 static void build_mnt_list(FILE *);
47
48 mnt_t *
lookup_mntent_byname(char * nm)49 lookup_mntent_byname(char *nm)
50 {
51 mnt_t *rv = 0;
52 mnt_t *minfo;
53 uint_t did_nfs;
54
55
56 if (nm) {
57 minfo = ufs;
58 did_nfs = 0;
59 while (minfo) {
60 if (strcmp(nm, minfo->device_name)) {
61 if (minfo->next != 0)
62 minfo = minfo->next;
63 else if (did_nfs == 0) {
64 minfo = nfs;
65 did_nfs = 1;
66 }
67 else
68 minfo = 0;
69 } else {
70 rv = minfo;
71 break;
72 }
73 }
74 }
75 return (rv);
76 }
77
78 void
do_mnttab(void)79 do_mnttab(void)
80 {
81 struct stat buf;
82 FILE *mpt;
83 struct flock lb;
84
85 if (stat(MNTTAB, &buf) == 0) {
86 if (buf.st_mtime != mtime) {
87 /*
88 * File has changed. Get the new file.
89 */
90 if ((mpt = fopen(MNTTAB, "r"))) {
91 lb.l_type = F_RDLCK;
92 lb.l_whence = 0;
93 lb.l_start = 0;
94 lb.l_len = 0;
95 (void) fcntl(fileno(mpt), F_SETLKW, &lb);
96 build_mnt_list(mpt);
97 mtime = buf.st_mtime;
98 /*
99 * Lock goes away when we close the file.
100 */
101 (void) fclose(mpt);
102 }
103 }
104 }
105 }
106
107 static void
build_mnt_list(FILE * mpt)108 build_mnt_list(FILE *mpt)
109 {
110 mnt_t *item;
111 mnt_t **which;
112 mnt_t *tmp;
113 int found;
114 struct extmnttab mnt;
115
116 if (mpt) {
117 while (nfs) {
118 free(nfs->device_name);
119 free(nfs->mount_point);
120 free(nfs->devinfo);
121 tmp = nfs;
122 nfs = nfs->next;
123 free(tmp);
124 }
125 while (ufs) {
126 free(ufs->device_name);
127 free(ufs->mount_point);
128 free(ufs->devinfo);
129 tmp = ufs;
130 ufs = ufs->next;
131 free(tmp);
132 }
133 (void) memset(&mnt, 0, sizeof (struct extmnttab));
134
135 resetmnttab(mpt);
136 while ((found = getextmntent(mpt, &mnt,
137 sizeof (struct extmnttab))) != -1) {
138 if (found == 0) {
139 if (strcmp(mnt.mnt_fstype, MNTTYPE_UFS) == 0)
140 which = &ufs;
141 else if (strcmp(mnt.mnt_fstype,
142 MNTTYPE_NFS) == 0)
143 which = &nfs;
144 else
145 which = 0;
146 if (which) {
147 item = safe_alloc(sizeof (mnt_t));
148 item->device_name =
149 safe_strdup(mnt.mnt_special);
150 item->mount_point =
151 safe_strdup(mnt.mnt_mountp);
152 item->devinfo =
153 safe_strdup(mnt.mnt_mntopts);
154 item->minor = mnt.mnt_minor;
155 item->next = *which;
156 *which = item;
157 }
158 }
159 }
160 }
161 }
162