561 lines
11 KiB
C
561 lines
11 KiB
C
/* $NetBSD: swapctl.c,v 1.18 2001/02/19 22:56:23 cgd Exp $ */
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/*
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* Copyright (c) 1996, 1997, 1999 Matthew R. Green
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 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.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* swapctl command:
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* -A add all devices listed as `sw' in /etc/fstab (also
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* (sets the dump device, if listed in fstab)
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* -D <dev> set dumpdev to <dev>
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* -z show dumpdev
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* -U remove all devices listed as `sw' in /etc/fstab.
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* -t [blk|noblk] if -A or -U , add (remove) either all block device
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* or all non-block devices
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* -a <dev> add this device
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* -d <dev> remove this swap device
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* -l list swap devices
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* -s short listing of swap devices
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* -k use kilobytes
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* -p <pri> use this priority
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* -c change priority
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*
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* or, if invoked as "swapon" (compatibility mode):
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*
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* -a all devices listed as `sw' in /etc/fstab
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* -t same as -t above (feature not present in old
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* swapon(8) command)
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* <dev> add this device
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/swap.h>
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#include <unistd.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fstab.h>
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#include "swapctl.h"
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int command;
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/*
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* Commands for swapctl(8). These are mutually exclusive.
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*/
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#define CMD_A 0x01 /* process /etc/fstab for adding */
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#define CMD_D 0x02 /* set dumpdev */
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#define CMD_U 0x04 /* process /etc/fstab for removing */
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#define CMD_a 0x08 /* add a swap file/device */
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#define CMD_c 0x10 /* change priority of a swap file/device */
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#define CMD_d 0x20 /* delete a swap file/device */
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#define CMD_l 0x40 /* list swap files/devices */
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#define CMD_s 0x80 /* summary of swap files/devices */
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#define CMD_z 0x100 /* show dump device */
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#define SET_COMMAND(cmd) \
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do { \
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if (command) \
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usage(); \
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command = (cmd); \
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} while (0)
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/*
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* Commands that require a "path" argument at the end of the command
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* line, and the ones which require that none exist.
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*/
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#define REQUIRE_PATH (CMD_D | CMD_a | CMD_c | CMD_d)
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#define REQUIRE_NOPATH (CMD_A | CMD_U | CMD_l | CMD_s | CMD_z)
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/*
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* Option flags, and the commands with which they are valid.
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*/
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int kflag; /* display in 1K blocks */
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#define KFLAG_CMDS (CMD_l | CMD_s)
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int pflag; /* priority was specified */
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#define PFLAG_CMDS (CMD_A | CMD_a | CMD_c)
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char *tflag; /* swap device type (blk or noblk) */
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#define TFLAG_CMDS (CMD_A | CMD_U)
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int pri; /* uses 0 as default pri */
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static void change_priority __P((const char *));
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static int add_swap __P((const char *, int));
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static int delete_swap __P((const char *));
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static void set_dumpdev __P((const char *));
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static void get_dumpdev __P((void));
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int main __P((int, char *[]));
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static void do_fstab __P((int));
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static void usage __P((void));
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static void swapon_command __P((int, char **));
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#if 0
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static void swapoff_command __P((int, char **));
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#endif
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int c;
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if (strcmp(getprogname(), "swapon") == 0) {
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swapon_command(argc, argv);
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/* NOTREACHED */
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}
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#if 0
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if (strcmp(getprogname(), "swapoff") == 0) {
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swapoff_command(argc, argv);
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/* NOTREACHED */
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}
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#endif
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while ((c = getopt(argc, argv, "ADUacdlkp:st:z")) != -1) {
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switch (c) {
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case 'A':
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SET_COMMAND(CMD_A);
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break;
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case 'D':
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SET_COMMAND(CMD_D);
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break;
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case 'U':
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SET_COMMAND(CMD_U);
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break;
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case 'a':
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SET_COMMAND(CMD_a);
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break;
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case 'c':
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SET_COMMAND(CMD_c);
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break;
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case 'd':
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SET_COMMAND(CMD_d);
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break;
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case 'l':
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SET_COMMAND(CMD_l);
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break;
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case 'k':
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kflag = 1;
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break;
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case 'p':
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pflag = 1;
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/* XXX strtol() */
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pri = atoi(optarg);
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break;
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case 's':
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SET_COMMAND(CMD_s);
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break;
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case 't':
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if (tflag != NULL)
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usage();
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tflag = optarg;
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break;
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case 'z':
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SET_COMMAND(CMD_z);
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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/* Did the user specify a command? */
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if (command == 0)
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usage();
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argv += optind;
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argc -= optind;
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switch (argc) {
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case 0:
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if (command & REQUIRE_PATH)
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usage();
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break;
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case 1:
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if (command & REQUIRE_NOPATH)
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usage();
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break;
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default:
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usage();
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}
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/* To change priority, you have to specify one. */
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if ((command == CMD_c) && pflag == 0)
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usage();
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/* Sanity-check -t */
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if (tflag != NULL) {
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if (command != CMD_A && command != CMD_U)
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usage();
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if (strcmp(tflag, "blk") != 0 &&
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strcmp(tflag, "noblk") != 0)
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usage();
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}
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/* Dispatch the command. */
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switch (command) {
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case CMD_l:
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list_swap(pri, kflag, pflag, 0, 1);
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break;
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case CMD_s:
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list_swap(pri, kflag, pflag, 0, 0);
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break;
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case CMD_c:
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change_priority(argv[0]);
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break;
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case CMD_a:
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if (! add_swap(argv[0], pri))
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exit(1);
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break;
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case CMD_d:
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if (! delete_swap(argv[0]))
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exit(1);
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break;
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case CMD_A:
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do_fstab(1);
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break;
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case CMD_D:
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set_dumpdev(argv[0]);
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break;
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case CMD_z:
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get_dumpdev();
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break;
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case CMD_U:
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do_fstab(0);
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break;
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}
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exit(0);
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}
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/*
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* swapon_command: emulate the old swapon(8) program.
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*/
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static void
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swapon_command(argc, argv)
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int argc;
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char **argv;
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{
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int ch, fiztab = 0;
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while ((ch = getopt(argc, argv, "at:")) != -1) {
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switch (ch) {
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case 'a':
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fiztab = 1;
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break;
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case 't':
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if (tflag != NULL)
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usage();
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tflag = optarg;
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break;
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default:
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goto swapon_usage;
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}
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}
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argc -= optind;
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argv += optind;
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if (fiztab) {
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if (argc)
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goto swapon_usage;
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/* Sanity-check -t */
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if (tflag != NULL) {
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if (strcmp(tflag, "blk") != 0 &&
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strcmp(tflag, "noblk") != 0)
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usage();
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}
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do_fstab(1);
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exit(0);
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} else if (argc == 0 || tflag != NULL)
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goto swapon_usage;
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while (argc) {
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if (! add_swap(argv[0], pri))
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exit(1);
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argc--;
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argv++;
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}
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exit(0);
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/* NOTREACHED */
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swapon_usage:
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fprintf(stderr, "usage: %s -a [-t blk|noblk]\n", getprogname());
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fprintf(stderr, " %s <path> ...\n", getprogname());
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exit(1);
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}
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/*
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* change_priority: change the priority of a swap device.
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*/
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static void
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change_priority(path)
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const char *path;
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{
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if (swapctl(SWAP_CTL, path, pri) < 0)
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warn("%s", path);
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}
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/*
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* add_swap: add the pathname to the list of swap devices.
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*/
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static int
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add_swap(path, priority)
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const char *path;
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int priority;
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{
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struct stat sb;
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if (stat(path, &sb) < 0)
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goto oops;
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if (sb.st_mode & S_IROTH)
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warnx("%s is readable by the world", path);
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if (sb.st_mode & S_IWOTH)
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warnx("%s is writable by the world", path);
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if (swapctl(SWAP_ON, path, priority) < 0) {
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oops:
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warn("%s", path);
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return (0);
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}
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return (1);
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}
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/*
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* delete_swap: remove the pathname to the list of swap devices.
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*/
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static int
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delete_swap(path)
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const char *path;
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{
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if (swapctl(SWAP_OFF, path, pri) < 0) {
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warn("%s", path);
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return (0);
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}
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return (1);
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}
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static void
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set_dumpdev(path)
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const char *path;
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{
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if (swapctl(SWAP_DUMPDEV, path, NULL) == -1)
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warn("could not set dump device to %s", path);
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else
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printf("%s: setting dump device to %s\n", getprogname(), path);
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}
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static void
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get_dumpdev()
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{
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dev_t dev;
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char *name;
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if (swapctl(SWAP_GETDUMPDEV, &dev, NULL) == -1)
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warn("could not get dump device");
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else {
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name = devname(dev, S_IFBLK);
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printf("dump device is ");
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if (name)
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printf("%s\n", name);
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else
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printf("major %d minor %d\n", major(dev), minor(dev));
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}
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}
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static void
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do_fstab(add)
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int add;
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{
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struct fstab *fp;
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char *s;
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long priority;
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struct stat st;
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int isblk;
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int gotone = 0;
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#define PATH_MOUNT "/sbin/mount_nfs"
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#define PATH_UMOUNT "/sbin/umount"
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char cmd[2*PATH_MAX+sizeof(PATH_MOUNT)+2];
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#define PRIORITYEQ "priority="
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#define NFSMNTPT "nfsmntpt="
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while ((fp = getfsent()) != NULL) {
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const char *spec;
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spec = fp->fs_spec;
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cmd[0] = '\0';
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if (strcmp(fp->fs_type, "dp") == 0 && add) {
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set_dumpdev(spec);
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continue;
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}
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if (strcmp(fp->fs_type, "sw") != 0)
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continue;
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isblk = 0;
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if ((s = strstr(fp->fs_mntops, PRIORITYEQ)) != NULL) {
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s += sizeof(PRIORITYEQ) - 1;
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priority = atol(s);
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} else
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priority = pri;
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if ((s = strstr(fp->fs_mntops, NFSMNTPT)) != NULL) {
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char *t;
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/*
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* Skip this song and dance if we're only
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* doing block devices.
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*/
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if (tflag != NULL && strcmp(tflag, "blk") == 0)
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continue;
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t = strpbrk(s, ",");
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if (t != 0)
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*t = '\0';
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spec = strdup(s + strlen(NFSMNTPT));
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if (t != 0)
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*t = ',';
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if (spec == NULL)
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errx(1, "Out of memory");
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if (strlen(spec) == 0) {
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warnx("empty mountpoint");
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free((char *)spec);
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continue;
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}
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if (add) {
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snprintf(cmd, sizeof(cmd), "%s %s %s",
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PATH_MOUNT, fp->fs_spec, spec);
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if (system(cmd) != 0) {
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warnx("%s: mount failed", fp->fs_spec);
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continue;
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}
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} else {
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snprintf(cmd, sizeof(cmd), "%s %s",
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PATH_UMOUNT, fp->fs_spec);
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}
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} else {
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/*
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* Determine blk-ness.
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*/
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if (stat(spec, &st) < 0) {
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warn("%s", spec);
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continue;
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}
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if (S_ISBLK(st.st_mode))
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isblk = 1;
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}
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/*
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* Skip this type if we're told to.
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*/
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if (tflag != NULL) {
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if (strcmp(tflag, "blk") == 0 && isblk == 0)
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continue;
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if (strcmp(tflag, "noblk") == 0 && isblk == 1)
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continue;
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}
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if (add) {
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if (add_swap(spec, (int)priority)) {
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gotone = 1;
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printf(
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"%s: adding %s as swap device at priority %d\n",
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getprogname(), fp->fs_spec, (int)priority);
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}
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} else {
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if (delete_swap(spec)) {
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gotone = 1;
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printf(
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"%s: removing %s as swap device\n",
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getprogname(), fp->fs_spec);
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}
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if (cmd[0]) {
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if (system(cmd) != 0) {
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warnx("%s: umount failed", fp->fs_spec);
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continue;
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}
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}
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}
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if (spec != fp->fs_spec)
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free((char *)spec);
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}
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if (gotone == 0)
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exit(1);
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}
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static void
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usage()
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{
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const char *progname = getprogname();
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fprintf(stderr, "usage: %s -A [-p priority] [-t blk|noblk]\n",
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progname);
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fprintf(stderr, " %s -D dumppath\n", progname);
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fprintf(stderr, " %s -U [-t blk|noblk]\n", progname);
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fprintf(stderr, " %s -a [-p priority] path\n", progname);
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fprintf(stderr, " %s -c -p priority path\n", progname);
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fprintf(stderr, " %s -d path\n", progname);
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fprintf(stderr, " %s -l | -s [-k]\n", progname);
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exit(1);
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}
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