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 (c) 2000 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 #include <sys/types.h>
28 #include <sys/statvfs.h>
29 #include <sys/param.h>
30 #include <sys/stat.h>
31
32 #include <unistd.h>
33 #include <string.h>
34 #include <stdio.h>
35 #include <fcntl.h>
36
37 #include "utils.h"
38
39 static FILE *
minfree_open(const char * dir,int oflags,const char * fmode)40 minfree_open(const char *dir, int oflags, const char *fmode)
41 {
42 char path[MAXPATHLEN];
43 int fd;
44
45 (void) snprintf(path, sizeof (path), "%s/minfree", dir);
46
47 if ((fd = open(path, oflags, S_IRUSR | S_IWUSR)) >= 0)
48 return (fdopen(fd, fmode));
49
50 return (NULL);
51 }
52
53 int
minfree_read(const char * dir,unsigned long long * ullp)54 minfree_read(const char *dir, unsigned long long *ullp)
55 {
56 FILE *fp = minfree_open(dir, O_RDONLY, "r");
57
58 if (fp != NULL) {
59 char buf[BUFSIZ];
60 int status = -1;
61
62 if (fgets(buf, BUFSIZ, fp) != NULL) {
63 if (valid_str2ull(buf, ullp))
64 status = 0;
65 else
66 warn(gettext("\"%s/minfree\": invalid minfree "
67 "value -- %s\n"), dir, buf);
68 }
69
70 (void) fclose(fp);
71 return (status);
72 }
73
74 return (-1);
75 }
76
77 int
minfree_write(const char * dir,unsigned long long ull)78 minfree_write(const char *dir, unsigned long long ull)
79 {
80 FILE *fp = minfree_open(dir, O_WRONLY | O_CREAT | O_TRUNC, "w");
81
82 if (fp != NULL) {
83 int status = fprintf(fp, "%llu\n", ull);
84 (void) fclose(fp);
85 return (status);
86 }
87
88 return (-1);
89 }
90
91 int
minfree_compute(const char * dir,char * s,unsigned long long * ullp)92 minfree_compute(const char *dir, char *s, unsigned long long *ullp)
93 {
94 size_t len = strlen(s);
95 unsigned long long m = 1;
96
97 struct statvfs64 fsb;
98 int pct;
99
100 switch (s[len - 1]) {
101 case '%':
102 s[len - 1] = '\0';
103
104 if (!valid_str2int(s, &pct) || pct > 100) {
105 warn(gettext("invalid minfree %% -- %s\n"), s);
106 return (-1);
107 }
108
109 if (statvfs64(dir, &fsb) == -1) {
110 warn(gettext("failed to statvfs %s"), dir);
111 return (-1);
112 }
113
114 *ullp = fsb.f_blocks * fsb.f_frsize *
115 (u_longlong_t)pct / 100ULL / 1024ULL;
116
117 return (0);
118
119 case 'm':
120 case 'M':
121 m = 1024ULL;
122 /*FALLTHRU*/
123
124 case 'k':
125 case 'K':
126 s[len - 1] = '\0';
127
128 if (valid_str2ull(s, ullp)) {
129 *ullp *= m;
130 return (0);
131 }
132
133 warn(gettext("invalid minfree value -- %s\n"), s);
134 return (-1);
135
136 default:
137 warn(gettext("expected m, k, or %% unit after "
138 "minfree -- %s\n"), s);
139 return (-1);
140 }
141 }
142