sbin/swapon/swapon.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)swapon.c 8.1 (Berkeley) 6/5/93
  35  * $FreeBSD: src/sbin/swapon/swapon.c,v 1.8.2.2 2001/07/30 10:30:11 dd Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/stat.h>
  40 #include <sys/sysctl.h>
  41 #include <vm/vm_param.h>
  42
  43 #include <err.h>
  44 #include <errno.h>
  45 #include <fstab.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50 #include <fcntl.h>
  51 #include <libutil.h>
  52
  53 static void usage(void);
  54 static int swap_on_off(char *name, int doingall);
  55 static void swaplist(int lflag, int sflag, int hflag);
  56
  57 enum { SWAPON, SWAPOFF, SWAPCTL } orig_prog, which_prog = SWAPCTL;
  58
  59 int
  60 main(int argc, char **argv)
  61 {
  62         struct fstab *fsp;
  63         char *ptr;
  64         int ret;
  65         int ch;
  66         int doall, sflag, lflag, hflag, qflag;
  67
  68         if ((ptr = strrchr(argv[0], '/')) == NULL)
  69                 ptr = argv[0];
  70         if (strstr(ptr, "swapon"))
  71                 which_prog = SWAPON;
  72         else if (strstr(ptr, "swapoff"))
  73                 which_prog = SWAPOFF;
  74         orig_prog = which_prog;
  75
  76         sflag = lflag = hflag = qflag = doall = 0;
  77         while ((ch = getopt(argc, argv, "AadghklmqsU")) != -1) {
  78                 switch((char)ch) {
  79                 case 'A':
  80                         if (which_prog == SWAPCTL) {
  81                                 doall = 1;
  82                                 which_prog = SWAPON;
  83                         } else {
  84                                 usage();
  85                         }
  86                         break;
  87                 case 'a':
  88                         if (which_prog == SWAPON || which_prog == SWAPOFF)
  89                                 doall = 1;
  90                         else
  91                                 which_prog = SWAPON;
  92                         break;
  93                 case 'd':
  94                         if (which_prog == SWAPCTL)
  95                                 which_prog = SWAPOFF;
  96                         else
  97                                 usage();
  98                         break;
  99                 case 'g':
 100                         hflag = 'G';
 101                         break;
 102                 case 'h':
 103                         hflag = 'H';
 104                         break;
 105                 case 'k':
 106                         hflag = 'K';
 107                         break;
 108                 case 'l':
 109                         lflag = 1;
 110                         break;
 111                 case 'm':
 112                         hflag = 'M';
 113                         break;
 114                 case 'q':
 115                         if (which_prog == SWAPON || which_prog == SWAPOFF)
 116                                 qflag = 1;
 117                         break;
 118                 case 's':
 119                         sflag = 1;
 120                         break;
 121                 case 'U':
 122                         if (which_prog == SWAPCTL) {
 123                                 doall = 1;
 124                                 which_prog = SWAPOFF;
 125                         } else {
 126                                 usage();
 127                         }
 128                         break;
 129                 case '?':
 130                 default:
 131                         usage();
 132                 }
 133         }
 134         argv += optind;
 135
 136         ret = 0;
 137         if (which_prog == SWAPON || which_prog == SWAPOFF) {
 138                 if (doall) {
 139                         while ((fsp = getfsent()) != NULL) {
 140                                 if (strcmp(fsp->fs_type, FSTAB_SW))
 141                                         continue;
 142                                 if (strstr(fsp->fs_mntops, "noauto"))
 143                                         continue;
 144                                 if (swap_on_off(fsp->fs_spec, 1)) {
 145                                         ret = 1;
 146                                 } else {
 147                                         if (!qflag) {
 148                                                 printf("%s: %sing %s as swap device\n",
 149                                                     getprogname(),
 150                                                     which_prog == SWAPOFF ? "remov" : "add",
 151                                                     fsp->fs_spec);
 152                                         }
 153                                 }
 154                         }
 155                 } else if (*argv == NULL) {
 156                         usage();
 157                 }
 158                 for (; *argv; ++argv) {
 159                         if (swap_on_off(getdevpath(*argv, 0), 0)) {
 160                                 ret = 1;
 161                         } else if (orig_prog == SWAPCTL) {
 162                                 printf("%s: %sing %s as swap device\n",
 163                                     getprogname(),
 164                                     which_prog == SWAPOFF ? "remov" : "add",
 165                                     *argv);
 166                         }
 167                 }
 168         } else {
 169                 if (lflag || sflag)
 170                         swaplist(lflag, sflag, hflag);
 171                 else
 172                         usage();
 173         }
 174         exit(ret);
 175 }
 176
 177 static int
 178 swap_on_off(char *name, int doingall)
 179 {
 180         if ((which_prog == SWAPOFF ? swapoff(name) : swapon(name)) == -1) {
 181                 switch(errno) {
 182                 case EBUSY:
 183                         if (!doingall)
 184                                 warnx("%s: device already in use", name);
 185                         break;
 186                 case EINVAL:
 187                         if (which_prog == SWAPON)
 188                                 warnx("%s: NSWAPDEV limit reached", name);
 189                         else if (!doingall)
 190                                 warn("%s", name);
 191                         break;
 192                 default:
 193                         warn("%s", name);
 194                         break;
 195                 }
 196                 return(1);
 197         }
 198         return(0);
 199 }
 200
 201 static void
 202 usage(void)
 203 {
 204         fprintf(stderr, "usage: %s ", getprogname());
 205         switch (orig_prog) {
 206         case SWAPON:
 207         case SWAPOFF:
 208                 fprintf(stderr, "-aq | file ...\n");
 209                 break;
 210         case SWAPCTL:
 211                 fprintf(stderr, "[-AghklmsU] [-a file ... | -d file ...]\n");
 212                 break;
 213         }
 214         exit(1);
 215 }
 216
 217 static void
 218 sizetobuf(char *buf, size_t bufsize, int hflag, long long val, int hlen,
 219     long blocksize)
 220 {
 221         if (hflag == 'H') {
 222                 char tmp[16];
 223
 224                 humanize_number(tmp, 5, (int64_t)val, "", HN_AUTOSCALE,
 225                     HN_B | HN_NOSPACE | HN_DECIMAL);
 226                 snprintf(buf, bufsize, "%*s", hlen, tmp);
 227         } else {
 228                 snprintf(buf, bufsize, "%*lld", hlen, val / blocksize);
 229         }
 230 }
 231
 232 static void
 233 swaplist(int lflag, int sflag, int hflag)
 234 {
 235         size_t ksize, bytes = 0;
 236         char *xswbuf;
 237         struct xswdev *xsw;
 238         int hlen, pagesize;
 239         int i, n;
 240         long blocksize;
 241         long long total, used, tmp_total, tmp_used;
 242         char buf[32];
 243
 244         pagesize = getpagesize();
 245         switch(hflag) {
 246         case 'G':
 247                 blocksize = 1024 * 1024 * 1024;
 248                 strlcpy(buf, "1GB-blocks", sizeof(buf));
 249                 hlen = 10;
 250                 break;
 251         case 'H':
 252                 blocksize = -1;
 253                 strlcpy(buf, "Bytes", sizeof(buf));
 254                 hlen = 10;
 255                 break;
 256         case 'K':
 257                 blocksize = 1024;
 258                 strlcpy(buf, "1kB-blocks", sizeof(buf));
 259                 hlen = 10;
 260                 break;
 261         case 'M':
 262                 blocksize = 1024 * 1024;
 263                 strlcpy(buf, "1MB-blocks", sizeof(buf));
 264                 hlen = 10;
 265                 break;
 266         default:
 267                 getbsize(&hlen, &blocksize);
 268                 snprintf(buf, sizeof(buf), "%ld-blocks", blocksize);
 269                 break;
 270         }
 271
 272         if (sysctlbyname("vm.swap_info_array", NULL, &bytes, NULL, 0) < 0)
 273                 err(1, "sysctlbyname()");
 274         if (bytes == 0)
 275                 err(1, "sysctlbyname()");
 276
 277         xswbuf = malloc(bytes);
 278         if (sysctlbyname("vm.swap_info_array", xswbuf, &bytes, NULL, 0) < 0) {
 279                 free(xswbuf);
 280                 err(1, "sysctlbyname()");
 281         }
 282         if (bytes == 0) {
 283                 free(xswbuf);
 284                 err(1, "sysctlbyname()");
 285         }
 286
 287         /*
 288          * Calculate size of xsw entry returned by kernel (it can be larger
 289          * than the one we have if there is a version mismatch).
 290          */
 291         ksize = ((struct xswdev *)xswbuf)->xsw_size;
 292         n = (int)(bytes / ksize);
 293
 294         if (lflag) {
 295                 printf("%-13s %*s %*s\n",
 296                     "Device:",
 297                     hlen, buf,
 298                     hlen, "Used:");
 299         }
 300
 301         total = used = tmp_total = tmp_used = 0;
 302         for (i = 0; i < n; ++i) {
 303                 xsw = (void *)((char *)xswbuf + i * ksize);
 304
 305                 if (xsw->xsw_nblks == 0)
 306                         continue;
 307
 308                 tmp_total = (long long)xsw->xsw_nblks * pagesize;
 309                 tmp_used = (long long)xsw->xsw_used * pagesize;
 310                 total += tmp_total;
 311                 used += tmp_used;
 312                 if (lflag) {
 313                         sizetobuf(buf, sizeof(buf), hflag, tmp_total, hlen,
 314                             blocksize);
 315                         if (xsw->xsw_dev == NODEV) {
 316                                 printf("%-13s %s ", "[NFS swap]", buf);
 317                         } else {
 318                                 printf("/dev/%-8s %s ",
 319                                     devname(xsw->xsw_dev, S_IFCHR), buf);
 320                         }
 321
 322                         sizetobuf(buf, sizeof(buf), hflag, tmp_used, hlen,
 323                             blocksize);
 324                         printf("%s\n", buf);
 325                 }
 326         }
 327
 328         if (sflag) {
 329                 sizetobuf(buf, sizeof(buf), hflag, total, hlen, blocksize);
 330                 printf("Total:        %s ", buf);
 331                 sizetobuf(buf, sizeof(buf), hflag, used, hlen, blocksize);
 332                 printf("%s\n", buf);
 333         }
 334 }