NetBSD/sbin/swapctl/swapctl.c

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/* $NetBSD: swapctl.c,v 1.8 1998/02/10 03:14:33 mrg Exp $ */
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/*
* Copyright (c) 1996, 1997 Matthew R. Green
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* swapctl command:
* -A add all devices listed as `sw' in /etc/fstab
* -t [blk|noblk] if -A, add either all block device or all non-block
* devices
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* -a <dev> add this device
* -d <dev> remove this swap device (not supported yet)
* -l list swap devices
* -s short listing of swap devices
* -k use kilobytes
* -p <pri> use this priority
* -c change priority
*
* or, if invoked as "swapon" (compatibility mode):
*
* -a all devices listed as `sw' in /etc/fstab
* -t same as -t above (feature not present in old
* swapon(8) command)
* <dev> add this device
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*/
#include <sys/param.h>
#include <sys/stat.h>
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#include <vm/vm_swap.h>
#include <unistd.h>
#include <err.h>
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#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fstab.h>
#include "swapctl.h"
int command;
/*
* Commands for swapctl(8). These are mutually exclusive.
*/
#define CMD_A 0x01 /* process /etc/fstab */
#define CMD_a 0x02 /* add a swap file/device */
#define CMD_c 0x04 /* change priority of a swap file/device */
#define CMD_d 0x08 /* delete a swap file/device */
#define CMD_l 0x10 /* list swap files/devices */
#define CMD_s 0x20 /* summary of swap files/devices */
#define SET_COMMAND(cmd) \
do { \
if (command) \
usage(); \
command = (cmd); \
} while (0)
/*
* Commands that require a "path" argument at the end of the command
* line, and the ones which require that none exist.
*/
#define REQUIRE_PATH (CMD_a | CMD_c | CMD_d)
#define REQUIRE_NOPATH (CMD_A | CMD_l | CMD_s)
/*
* Option flags, and the commands with which they are valid.
*/
int kflag; /* display in 1K blocks */
#define KFLAG_CMDS (CMD_l | CMD_s)
int pflag; /* priority was specified */
#define PFLAG_CMDS (CMD_A | CMD_a | CMD_c)
char *tflag; /* swap device type (blk or noblk) */
#define TFLAG_CMDS (CMD_A)
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int pri; /* uses 0 as default pri */
static void change_priority __P((char *));
static void add_swap __P((char *));
static void del_swap __P((char *));
int main __P((int, char *[]));
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static void do_fstab __P((void));
static void usage __P((void));
static void swapon_command __P((int, char **));
#if 0
static void swapoff_command __P((int, char **));
#endif
extern char *__progname; /* from crt0.o */
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int
main(argc, argv)
int argc;
char *argv[];
{
int c;
if (strcmp(__progname, "swapon") == 0) {
swapon_command(argc, argv);
/* NOTREACHED */
}
#if 0
if (strcmp(__progname, "swapoff") == 0) {
swapoff_command(argc, argv);
/* NOTREACHED */
}
#endif
while ((c = getopt(argc, argv, "Aacdlkp:st:")) != -1) {
switch (c) {
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case 'A':
SET_COMMAND(CMD_A);
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break;
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case 'a':
SET_COMMAND(CMD_a);
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break;
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case 'c':
SET_COMMAND(CMD_c);
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break;
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case 'd':
SET_COMMAND(CMD_d);
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break;
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case 'l':
SET_COMMAND(CMD_l);
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break;
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case 'k':
kflag = 1;
break;
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case 'p':
pflag = 1;
/* XXX strtol() */
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pri = atoi(optarg);
break;
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case 's':
SET_COMMAND(CMD_s);
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break;
case 't':
if (tflag != NULL)
usage();
tflag = optarg;
break;
default:
usage();
/* NOTREACHED */
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}
}
/* Did the user specify a command? */
if (command == 0)
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usage();
argv += optind;
argc -= optind;
switch (argc) {
case 0:
if (command & REQUIRE_PATH)
usage();
break;
case 1:
if (command & REQUIRE_NOPATH)
usage();
break;
default:
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usage();
}
/* To change priority, you have to specify one. */
if ((command == CMD_c) && pflag == 0)
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usage();
/* Sanity-check -t */
if (tflag != NULL) {
if (command != CMD_A)
usage();
if (strcmp(tflag, "blk") != 0 &&
strcmp(tflag, "noblk") != 0)
usage();
}
/* Dispatch the command. */
switch (command) {
case CMD_l:
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list_swap(pri, kflag, pflag, 0, 1);
break;
case CMD_s:
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list_swap(pri, kflag, pflag, 0, 0);
break;
case CMD_c:
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change_priority(argv[0]);
break;
case CMD_a:
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add_swap(argv[0]);
break;
case CMD_d:
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del_swap(argv[0]);
break;
case CMD_A:
do_fstab();
break;
}
exit(0);
}
/*
* swapon_command: emulate the old swapon(8) program.
*/
void
swapon_command(argc, argv)
int argc;
char **argv;
{
int ch, fiztab = 0;
while ((ch = getopt(argc, argv, "at:")) != -1) {
switch (ch) {
case 'a':
fiztab = 1;
break;
case 't':
if (tflag != NULL)
usage();
tflag = optarg;
break;
default:
goto swapon_usage;
}
}
argc -= optind;
argv += optind;
if (fiztab) {
if (argc)
goto swapon_usage;
/* Sanity-check -t */
if (tflag != NULL) {
if (strcmp(tflag, "blk") != 0 &&
strcmp(tflag, "noblk") != 0)
usage();
}
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do_fstab();
exit(0);
} else if (argc == 0 || tflag != NULL)
goto swapon_usage;
while (argc) {
add_swap(argv[0]);
argc--;
argv++;
}
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exit(0);
/* NOTREACHED */
swapon_usage:
fprintf(stderr, "usage: %s -a [-t blk|noblk]\n", __progname);
fprintf(stderr, " %s <path> ...\n", __progname);
exit(1);
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}
/*
* change_priority: change the priority of a swap device.
*/
void
change_priority(path)
char *path;
{
if (swapctl(SWAP_CTL, path, pri) < 0)
warn("%s", path);
}
/*
* add_swap: add the pathname to the list of swap devices.
*/
void
add_swap(path)
char *path;
{
if (swapctl(SWAP_ON, path, pri) < 0)
err(1, "%s", path);
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}
/*
* del_swap: remove the pathname to the list of swap devices.
*/
void
del_swap(path)
char *path;
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{
if (swapctl(SWAP_OFF, path, pri) < 0)
err(1, "%s", path);
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}
void
do_fstab()
{
struct fstab *fp;
char *s;
long priority;
struct stat st;
int isblk;
int gotone = 0;
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#define PRIORITYEQ "priority="
#define NFSMNTPT "nfsmntpt="
#define PATH_MOUNT "/sbin/mount_nfs"
while ((fp = getfsent()) != NULL) {
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char *spec;
if (strcmp(fp->fs_type, "sw") != 0)
continue;
spec = fp->fs_spec;
isblk = 0;
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if ((s = strstr(fp->fs_mntops, PRIORITYEQ)) != NULL) {
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s += sizeof(PRIORITYEQ) - 1;
priority = atol(s);
} else
priority = pri;
if ((s = strstr(fp->fs_mntops, NFSMNTPT)) != NULL) {
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char *t, cmd[2*PATH_MAX+sizeof(PATH_MOUNT)+2];
/*
* Skip this song and dance if we're only
* doing block devices.
*/
if (tflag != NULL &&
strcmp(tflag, "blk") == 0)
continue;
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t = strpbrk(s, ",");
if (t != 0)
*t = '\0';
spec = strdup(s + strlen(NFSMNTPT));
if (t != 0)
*t = ',';
if (spec == NULL)
errx(1, "Out of memory");
if (strlen(spec) == 0) {
warnx("empty mountpoint");
free(spec);
continue;
}
snprintf(cmd, sizeof(cmd), "%s %s %s",
PATH_MOUNT, fp->fs_spec, spec);
if (system(cmd) != 0) {
warnx("%s: mount failed", fp->fs_spec);
continue;
}
} else {
/*
* Determine blk-ness.
*/
if (stat(spec, &st) < 0) {
warn(spec);
continue;
}
if (S_ISBLK(st.st_mode))
isblk = 1;
}
/*
* Skip this type if we're told to.
*/
if (tflag != NULL) {
if (strcmp(tflag, "blk") == 0 && isblk == 0)
continue;
if (strcmp(tflag, "noblk") == 0 && isblk == 1)
continue;
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}
if (swapctl(SWAP_ON, spec, (int)priority) < 0)
warn("%s", spec);
else {
gotone = 1;
printf("%s: adding %s as swap device at priority %d\n",
__progname, fp->fs_spec, (int)priority);
}
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if (spec != fp->fs_spec)
free(spec);
}
if (gotone == 0)
exit(1);
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}
void
usage()
{
fprintf(stderr, "usage: %s -A [-p priority] [-t blk|noblk]\n",
__progname);
fprintf(stderr, " %s -a [-p priority] path\n", __progname);
fprintf(stderr, " %s -c -p priority path\n", __progname);
fprintf(stderr, " %s -d path\n", __progname);
fprintf(stderr, " %s -l | -s [-k]\n", __progname);
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exit(1);
}