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