xref: /illumos-gate/usr/src/cmd/dumpadm/minfree.c (revision 2a8bcb4e)
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 (c) 2000 by Sun Microsystems, Inc.
24*7c478bd9Sstevel@tonic-gate  * All rights reserved.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
28*7c478bd9Sstevel@tonic-gate #include <sys/statvfs.h>
29*7c478bd9Sstevel@tonic-gate #include <sys/param.h>
30*7c478bd9Sstevel@tonic-gate #include <sys/stat.h>
31*7c478bd9Sstevel@tonic-gate 
32*7c478bd9Sstevel@tonic-gate #include <unistd.h>
33*7c478bd9Sstevel@tonic-gate #include <string.h>
34*7c478bd9Sstevel@tonic-gate #include <stdio.h>
35*7c478bd9Sstevel@tonic-gate #include <fcntl.h>
36*7c478bd9Sstevel@tonic-gate 
37*7c478bd9Sstevel@tonic-gate #include "utils.h"
38*7c478bd9Sstevel@tonic-gate 
39*7c478bd9Sstevel@tonic-gate static FILE *
minfree_open(const char * dir,int oflags,const char * fmode)40*7c478bd9Sstevel@tonic-gate minfree_open(const char *dir, int oflags, const char *fmode)
41*7c478bd9Sstevel@tonic-gate {
42*7c478bd9Sstevel@tonic-gate 	char path[MAXPATHLEN];
43*7c478bd9Sstevel@tonic-gate 	int fd;
44*7c478bd9Sstevel@tonic-gate 
45*7c478bd9Sstevel@tonic-gate 	(void) snprintf(path, sizeof (path), "%s/minfree", dir);
46*7c478bd9Sstevel@tonic-gate 
47*7c478bd9Sstevel@tonic-gate 	if ((fd = open(path, oflags, S_IRUSR | S_IWUSR)) >= 0)
48*7c478bd9Sstevel@tonic-gate 		return (fdopen(fd, fmode));
49*7c478bd9Sstevel@tonic-gate 
50*7c478bd9Sstevel@tonic-gate 	return (NULL);
51*7c478bd9Sstevel@tonic-gate }
52*7c478bd9Sstevel@tonic-gate 
53*7c478bd9Sstevel@tonic-gate int
minfree_read(const char * dir,unsigned long long * ullp)54*7c478bd9Sstevel@tonic-gate minfree_read(const char *dir, unsigned long long *ullp)
55*7c478bd9Sstevel@tonic-gate {
56*7c478bd9Sstevel@tonic-gate 	FILE *fp = minfree_open(dir, O_RDONLY, "r");
57*7c478bd9Sstevel@tonic-gate 
58*7c478bd9Sstevel@tonic-gate 	if (fp != NULL) {
59*7c478bd9Sstevel@tonic-gate 		char buf[BUFSIZ];
60*7c478bd9Sstevel@tonic-gate 		int status = -1;
61*7c478bd9Sstevel@tonic-gate 
62*7c478bd9Sstevel@tonic-gate 		if (fgets(buf, BUFSIZ, fp) != NULL) {
63*7c478bd9Sstevel@tonic-gate 			if (valid_str2ull(buf, ullp))
64*7c478bd9Sstevel@tonic-gate 				status = 0;
65*7c478bd9Sstevel@tonic-gate 			else
66*7c478bd9Sstevel@tonic-gate 				warn(gettext("\"%s/minfree\": invalid minfree "
67*7c478bd9Sstevel@tonic-gate 				    "value -- %s\n"), dir, buf);
68*7c478bd9Sstevel@tonic-gate 		}
69*7c478bd9Sstevel@tonic-gate 
70*7c478bd9Sstevel@tonic-gate 		(void) fclose(fp);
71*7c478bd9Sstevel@tonic-gate 		return (status);
72*7c478bd9Sstevel@tonic-gate 	}
73*7c478bd9Sstevel@tonic-gate 
74*7c478bd9Sstevel@tonic-gate 	return (-1);
75*7c478bd9Sstevel@tonic-gate }
76*7c478bd9Sstevel@tonic-gate 
77*7c478bd9Sstevel@tonic-gate int
minfree_write(const char * dir,unsigned long long ull)78*7c478bd9Sstevel@tonic-gate minfree_write(const char *dir, unsigned long long ull)
79*7c478bd9Sstevel@tonic-gate {
80*7c478bd9Sstevel@tonic-gate 	FILE *fp = minfree_open(dir, O_WRONLY | O_CREAT | O_TRUNC, "w");
81*7c478bd9Sstevel@tonic-gate 
82*7c478bd9Sstevel@tonic-gate 	if (fp != NULL) {
83*7c478bd9Sstevel@tonic-gate 		int status = fprintf(fp, "%llu\n", ull);
84*7c478bd9Sstevel@tonic-gate 		(void) fclose(fp);
85*7c478bd9Sstevel@tonic-gate 		return (status);
86*7c478bd9Sstevel@tonic-gate 	}
87*7c478bd9Sstevel@tonic-gate 
88*7c478bd9Sstevel@tonic-gate 	return (-1);
89*7c478bd9Sstevel@tonic-gate }
90*7c478bd9Sstevel@tonic-gate 
91*7c478bd9Sstevel@tonic-gate int
minfree_compute(const char * dir,char * s,unsigned long long * ullp)92*7c478bd9Sstevel@tonic-gate minfree_compute(const char *dir, char *s, unsigned long long *ullp)
93*7c478bd9Sstevel@tonic-gate {
94*7c478bd9Sstevel@tonic-gate 	size_t len = strlen(s);
95*7c478bd9Sstevel@tonic-gate 	unsigned long long m = 1;
96*7c478bd9Sstevel@tonic-gate 
97*7c478bd9Sstevel@tonic-gate 	struct statvfs64 fsb;
98*7c478bd9Sstevel@tonic-gate 	int pct;
99*7c478bd9Sstevel@tonic-gate 
100*7c478bd9Sstevel@tonic-gate 	switch (s[len - 1]) {
101*7c478bd9Sstevel@tonic-gate 	case '%':
102*7c478bd9Sstevel@tonic-gate 		s[len - 1] = '\0';
103*7c478bd9Sstevel@tonic-gate 
104*7c478bd9Sstevel@tonic-gate 		if (!valid_str2int(s, &pct) || pct > 100) {
105*7c478bd9Sstevel@tonic-gate 			warn(gettext("invalid minfree %% -- %s\n"), s);
106*7c478bd9Sstevel@tonic-gate 			return (-1);
107*7c478bd9Sstevel@tonic-gate 		}
108*7c478bd9Sstevel@tonic-gate 
109*7c478bd9Sstevel@tonic-gate 		if (statvfs64(dir, &fsb) == -1) {
110*7c478bd9Sstevel@tonic-gate 			warn(gettext("failed to statvfs %s"), dir);
111*7c478bd9Sstevel@tonic-gate 			return (-1);
112*7c478bd9Sstevel@tonic-gate 		}
113*7c478bd9Sstevel@tonic-gate 
114*7c478bd9Sstevel@tonic-gate 		*ullp = fsb.f_blocks * fsb.f_frsize *
115*7c478bd9Sstevel@tonic-gate 		    (u_longlong_t)pct / 100ULL / 1024ULL;
116*7c478bd9Sstevel@tonic-gate 
117*7c478bd9Sstevel@tonic-gate 		return (0);
118*7c478bd9Sstevel@tonic-gate 
119*7c478bd9Sstevel@tonic-gate 	case 'm':
120*7c478bd9Sstevel@tonic-gate 	case 'M':
121*7c478bd9Sstevel@tonic-gate 		m = 1024ULL;
122*7c478bd9Sstevel@tonic-gate 		/*FALLTHRU*/
123*7c478bd9Sstevel@tonic-gate 
124*7c478bd9Sstevel@tonic-gate 	case 'k':
125*7c478bd9Sstevel@tonic-gate 	case 'K':
126*7c478bd9Sstevel@tonic-gate 		s[len - 1] = '\0';
127*7c478bd9Sstevel@tonic-gate 
128*7c478bd9Sstevel@tonic-gate 		if (valid_str2ull(s, ullp)) {
129*7c478bd9Sstevel@tonic-gate 			*ullp *= m;
130*7c478bd9Sstevel@tonic-gate 			return (0);
131*7c478bd9Sstevel@tonic-gate 		}
132*7c478bd9Sstevel@tonic-gate 
133*7c478bd9Sstevel@tonic-gate 		warn(gettext("invalid minfree value -- %s\n"), s);
134*7c478bd9Sstevel@tonic-gate 		return (-1);
135*7c478bd9Sstevel@tonic-gate 
136*7c478bd9Sstevel@tonic-gate 	default:
137*7c478bd9Sstevel@tonic-gate 		warn(gettext("expected m, k, or %% unit after "
138*7c478bd9Sstevel@tonic-gate 		    "minfree -- %s\n"), s);
139*7c478bd9Sstevel@tonic-gate 		return (-1);
140*7c478bd9Sstevel@tonic-gate 	}
141*7c478bd9Sstevel@tonic-gate }
142