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NetBSD/sbin/swapctl/swapctl.c

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/* $NetBSD: swapctl.c,v 1.29 2005/06/12 16:24:20 christos Exp $ */
/*
* Copyright (c) 1996, 1997, 1999 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
* 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 (also
* (sets the dump device, if listed in fstab)
* -D <dev> set dumpdev to <dev>
* -z show dumpdev
* -U remove all devices listed as `sw' in /etc/fstab.
* -t [blk|noblk] if -A or -U , add (remove) either all block device
* or all non-block devices
* -a <dev> add this device
* -d <dev> remove this swap device
* -g use gigabytes
* -h use humanize_number(3) for listing
* -l list swap devices
* -m use megabytes
* -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
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: swapctl.c,v 1.29 2005/06/12 16:24:20 christos Exp $");
#endif
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/swap.h>
#include <unistd.h>
#include <err.h>
#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 for adding */
#define CMD_D 0x02 /* set dumpdev */
#define CMD_U 0x04 /* process /etc/fstab for removing */
#define CMD_a 0x08 /* add a swap file/device */
#define CMD_c 0x10 /* change priority of a swap file/device */
#define CMD_d 0x20 /* delete a swap file/device */
#define CMD_l 0x40 /* list swap files/devices */
#define CMD_s 0x80 /* summary of swap files/devices */
#define CMD_z 0x100 /* show dump device */
#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_D | CMD_a | CMD_c | CMD_d)
#define REQUIRE_NOPATH (CMD_A | CMD_U | CMD_l | CMD_s | CMD_z)
/*
* Option flags, and the commands with which they are valid.
*/
int kflag; /* display in 1K^x blocks */
#define KFLAG_CMDS (CMD_l | CMD_s)
#define MFLAG_CMDS (CMD_l | CMD_s)
#define GFLAG_CMDS (CMD_l | CMD_s)
int hflag; /* display with humanize_number */
#define HFLAG_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 | CMD_U)
int pri; /* uses 0 as default pri */
static void change_priority(char *);
static int add_swap(char *, int);
static int delete_swap(char *);
static void set_dumpdev(char *);
static void get_dumpdev(void);
static void do_fstab(int);
static void usage(void);
static void swapon_command(int, char **);
#if 0
static void swapoff_command(int, char **);
#endif
int
main(int argc, char *argv[])
{
int c;
if (strcmp(getprogname(), "swapon") == 0) {
swapon_command(argc, argv);
/* NOTREACHED */
}
#if 0
if (strcmp(getprogname(), "swapoff") == 0) {
swapoff_command(argc, argv);
/* NOTREACHED */
}
#endif
while ((c = getopt(argc, argv, "ADUacdghklmp:st:z")) != -1) {
switch (c) {
case 'A':
SET_COMMAND(CMD_A);
break;
case 'D':
SET_COMMAND(CMD_D);
break;
case 'U':
SET_COMMAND(CMD_U);
break;
case 'a':
SET_COMMAND(CMD_a);
break;
case 'c':
SET_COMMAND(CMD_c);
break;
case 'd':
SET_COMMAND(CMD_d);
break;
case 'g':
kflag = 3; /* 1k ^ 3 */
break;
case 'h':
hflag = 1;
break;
case 'k':
kflag = 1;
break;
case 'l':
SET_COMMAND(CMD_l);
break;
case 'm':
kflag = 2; /* 1k ^ 2 */
break;
case 'p':
pflag = 1;
/* XXX strtol() */
pri = atoi(optarg);
break;
case 's':
SET_COMMAND(CMD_s);
break;
case 't':
if (tflag != NULL)
usage();
tflag = optarg;
break;
case 'z':
SET_COMMAND(CMD_z);
break;
default:
usage();
/* NOTREACHED */
}
}
/* Did the user specify a command? */
if (command == 0)
usage();
argv += optind;
argc -= optind;
switch (argc) {
case 0:
if (command & REQUIRE_PATH)
usage();
break;
case 1:
if (command & REQUIRE_NOPATH)
usage();
break;
default:
usage();
}
/* To change priority, you have to specify one. */
if ((command == CMD_c) && pflag == 0)
usage();
/* Sanity-check -t */
if (tflag != NULL) {
if (command != CMD_A && command != CMD_U)
usage();
if (strcmp(tflag, "blk") != 0 &&
strcmp(tflag, "noblk") != 0)
usage();
}
/* Dispatch the command. */
switch (command) {
case CMD_l:
list_swap(pri, kflag, pflag, 0, 1, hflag);
break;
case CMD_s:
list_swap(pri, kflag, pflag, 0, 0, hflag);
break;
case CMD_c:
change_priority(argv[0]);
break;
case CMD_a:
if (! add_swap(argv[0], pri))
exit(1);
break;
case CMD_d:
if (! delete_swap(argv[0]))
exit(1);
break;
case CMD_A:
do_fstab(1);
break;
case CMD_D:
set_dumpdev(argv[0]);
break;
case CMD_z:
get_dumpdev();
break;
case CMD_U:
do_fstab(0);
break;
}
exit(0);
}
/*
* swapon_command: emulate the old swapon(8) program.
*/
static void
swapon_command(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();
}
do_fstab(1);
exit(0);
} else if (argc == 0 || tflag != NULL)
goto swapon_usage;
while (argc) {
if (! add_swap(argv[0], pri))
exit(1);
argc--;
argv++;
}
exit(0);
/* NOTREACHED */
swapon_usage:
fprintf(stderr, "usage: %s -a [-t blk|noblk]\n", getprogname());
fprintf(stderr, " %s <path> ...\n", getprogname());
exit(1);
}
/*
* change_priority: change the priority of a swap device.
*/
static void
change_priority(char *path)
{
if (swapctl(SWAP_CTL, path, pri) < 0)
warn("%s", path);
}
/*
* add_swap: add the pathname to the list of swap devices.
*/
static int
add_swap(char *path, int priority)
{
struct stat sb;
if (stat(path, &sb) < 0)
goto oops;
if (sb.st_mode & S_IROTH)
warnx("WARNING: %s is readable by the world", path);
if (sb.st_mode & S_IWOTH)
warnx("WARNING: %s is writable by the world", path);
if (swapctl(SWAP_ON, path, priority) < 0) {
oops:
warn("%s", path);
return (0);
}
return (1);
}
/*
* delete_swap: remove the pathname to the list of swap devices.
*/
static int
delete_swap(char *path)
{
if (swapctl(SWAP_OFF, path, pri) < 0) {
warn("%s", path);
return (0);
}
return (1);
}
static void
set_dumpdev(char *path)
{
if (swapctl(SWAP_DUMPDEV, path, 0) == -1)
warn("could not set dump device to %s", path);
else
printf("%s: setting dump device to %s\n", getprogname(), path);
}
static void
get_dumpdev(void)
{
dev_t dev;
char *name;
if (swapctl(SWAP_GETDUMPDEV, &dev, 0) == -1)
warn("could not get dump device");
else if (dev == NODEV)
printf("no dump device set\n");
else {
name = devname(dev, S_IFBLK);
printf("dump device is ");
if (name)
printf("%s\n", name);
else
printf("major %d minor %d\n", major(dev), minor(dev));
}
}
static void
do_fstab(int add)
{
struct fstab *fp;
char *s;
long priority;
struct stat st;
int isblk;
int gotone = 0;
#ifdef RESCUEDIR
#define PATH_MOUNT RESCUEDIR "/mount_nfs"
#define PATH_UMOUNT RESCUEDIR "/umount"
#else
#define PATH_MOUNT "/sbin/mount_nfs"
#define PATH_UMOUNT "/sbin/umount"
#endif
char cmd[2*PATH_MAX+sizeof(PATH_MOUNT)+2];
#define PRIORITYEQ "priority="
#define NFSMNTPT "nfsmntpt="
while ((fp = getfsent()) != NULL) {
char *spec;
spec = fp->fs_spec;
cmd[0] = '\0';
if (strcmp(fp->fs_type, "dp") == 0 && add) {
set_dumpdev(spec);
continue;
}
if (strcmp(fp->fs_type, "sw") != 0)
continue;
/* handle dp as mnt option */
if (strstr(fp->fs_mntops, "dp") && add)
set_dumpdev(spec);
isblk = 0;
if ((s = strstr(fp->fs_mntops, PRIORITYEQ)) != NULL) {
s += sizeof(PRIORITYEQ) - 1;
priority = atol(s);
} else
priority = pri;
if ((s = strstr(fp->fs_mntops, NFSMNTPT)) != NULL) {
char *t;
/*
* Skip this song and dance if we're only
* doing block devices.
*/
if (tflag != NULL && strcmp(tflag, "blk") == 0)
continue;
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;
}
if (add) {
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 {
snprintf(cmd, sizeof(cmd), "%s %s",
PATH_UMOUNT, fp->fs_spec);
}
} else {
/*
* Determine blk-ness.
*/
if (stat(spec, &st) < 0) {
warn("%s", 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;
}
if (add) {
if (add_swap(spec, (int)priority)) {
gotone = 1;
printf(
"%s: adding %s as swap device at priority %d\n",
getprogname(), fp->fs_spec, (int)priority);
}
} else {
if (delete_swap(spec)) {
gotone = 1;
printf(
"%s: removing %s as swap device\n",
getprogname(), fp->fs_spec);
}
if (cmd[0]) {
if (system(cmd) != 0) {
warnx("%s: umount failed", fp->fs_spec);
continue;
}
}
}
if (spec != fp->fs_spec)
free(spec);
}
if (gotone == 0)
exit(1);
}
static void
usage(void)
{
const char *progname = getprogname();
fprintf(stderr, "usage: %s -A [-p priority] [-t blk|noblk]\n",
progname);
fprintf(stderr, " %s -D dumppath\n", progname);
fprintf(stderr, " %s -U [-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|-m|-g|-h]\n", progname);
fprintf(stderr, " %s -z\n", progname);
exit(1);
}
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