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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)swapon.c 8.1 (Berkeley) 6/5/93
  31  * $FreeBSD: src/sbin/swapon/swapon.c,v 1.8.2.2 2001/07/30 10:30:11 dd Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/stat.h>
  36 #include <sys/sysctl.h>
  37 #include <sys/diskslice.h>
  38 #include <sys/ioctl_compat.h>
  39 #include <vm/vm_param.h>
  40
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <fstab.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48 #include <fcntl.h>
  49 #include <libutil.h>
  50
  51 static void usage(void);
  52 static int swap_on_off(char *name, int doingall, int trim, int ask);
  53 static void swaplist(int lflag, int sflag, int hflag);
  54
  55 enum { SWAPON, SWAPOFF, SWAPCTL } orig_prog, which_prog = SWAPCTL;
  56
  57 int
  58 main(int argc, char **argv)
  59 {
  60         struct fstab *fsp;
  61         char *ptr;
  62         int ret;
  63         int ch;
  64         int doall, sflag, lflag, hflag, qflag, eflag, iflag;
  65
  66         if ((ptr = strrchr(argv[0], '/')) == NULL)
  67                 ptr = argv[0];
  68         if (strstr(ptr, "swapon"))
  69                 which_prog = SWAPON;
  70         else if (strstr(ptr, "swapoff"))
  71                 which_prog = SWAPOFF;
  72         orig_prog = which_prog;
  73
  74         sflag = lflag = hflag = qflag = doall = eflag = iflag = 0;
  75         while ((ch = getopt(argc, argv, "AadeghiklmqsU")) != -1) {
  76                 switch((char)ch) {
  77                 case 'A':
  78                         if (which_prog == SWAPCTL) {
  79                                 doall = 1;
  80                                 which_prog = SWAPON;
  81                         } else {
  82                                 usage();
  83                         }
  84                         break;
  85                 case 'a':
  86                         if (which_prog == SWAPON || which_prog == SWAPOFF)
  87                                 doall = 1;
  88                         else
  89                                 which_prog = SWAPON;
  90                         break;
  91                 case 'd':
  92                         if (which_prog == SWAPCTL)
  93                                 which_prog = SWAPOFF;
  94                         else
  95                                 usage();
  96                         break;
  97                 case 'e':
  98                         eflag = 1;
  99                         break;
 100                 case 'g':
 101                         hflag = 'G';
 102                         break;
 103                 case 'h':
 104                         hflag = 'H';
 105                         break;
 106                 case 'i':
 107                         iflag = 1;
 108                         break;
 109                 case 'k':
 110                         hflag = 'K';
 111                         break;
 112                 case 'l':
 113                         lflag = 1;
 114                         break;
 115                 case 'm':
 116                         hflag = 'M';
 117                         break;
 118                 case 'q':
 119                         if (which_prog == SWAPON || which_prog == SWAPOFF)
 120                                 qflag = 1;
 121                         break;
 122                 case 's':
 123                         sflag = 1;
 124                         break;
 125                 case 'U':
 126                         if (which_prog == SWAPCTL) {
 127                                 doall = 1;
 128                                 which_prog = SWAPOFF;
 129                         } else {
 130                                 usage();
 131                         }
 132                         break;
 133                 case '?':
 134                 default:
 135                         usage();
 136                 }
 137         }
 138         argv += optind;
 139
 140         ret = 0;
 141         if (which_prog == SWAPON || which_prog == SWAPOFF) {
 142                 if (doall) {
 143                         while ((fsp = getfsent()) != NULL) {
 144                                 if (strcmp(fsp->fs_type, FSTAB_SW))
 145                                         continue;
 146                                 if (strstr(fsp->fs_mntops, "noauto"))
 147                                         continue;
 148                                 if (swap_on_off(fsp->fs_spec, 1, eflag, iflag)) {
 149                                         ret = 1;
 150                                 } else {
 151                                         if (!qflag) {
 152                                                 printf("%s: %sing %s as swap device\n",
 153                                                     getprogname(),
 154                                                     which_prog == SWAPOFF ? "remov" : "add",
 155                                                     fsp->fs_spec);
 156                                         }
 157                                 }
 158                         }
 159                 } else if (*argv == NULL) {
 160                         usage();
 161                 }
 162                 for (; *argv; ++argv) {
 163                         if (swap_on_off(getdevpath(*argv, 0), 0, eflag, 1)) {
 164                                 ret = 1;
 165                         } else if (orig_prog == SWAPCTL) {
 166                                 printf("%s: %sing %s as swap device\n",
 167                                     getprogname(),
 168                                     which_prog == SWAPOFF ? "remov" : "add",
 169                                     *argv);
 170                         }
 171                 }
 172         } else {
 173                 if (lflag || sflag)
 174                         swaplist(lflag, sflag, hflag);
 175                 else
 176                         usage();
 177         }
 178         exit(ret);
 179 }
 180
 181 /*
 182  * TRIM the device
 183  */
 184 static
 185 void
 186 trim_volume(char * name)
 187 {
 188         struct partinfo pinfo;
 189         int fd,i,n;
 190         size_t bytes = 0,ksize;
 191         char *xswbuf;
 192         struct xswdev *xsw;
 193
 194
 195         /*
 196         * Determine if this device is already being used by swap without
 197         * calling swapon().
 198         */
 199         if ((sysctlbyname("vm.swap_info_array", NULL, &bytes, NULL, 0) < 0) ||
 200             bytes == 0) {
 201                 err(1, "sysctlbyname()");
 202         }
 203
 204         xswbuf = malloc(bytes);
 205         if ((sysctlbyname("vm.swap_info_array", xswbuf, &bytes, NULL, 0) < 0) ||
 206             bytes == 0) {
 207                         free(xswbuf);
 208                         err(1, "sysctlbyname()");
 209         }
 210
 211         ksize = ((struct xswdev *)xswbuf)->xsw_size;
 212         n = (int)(bytes / ksize);
 213         for (i = 0; i < n; ++i) {
 214                 xsw = (void *)((char *)xswbuf + i * ksize);
 215
 216                 if (xsw->xsw_dev == NODEV )
 217                         continue;
 218                 if(!strcmp(devname(xsw->xsw_dev, S_IFCHR),
 219                     name + strlen("/dev/"))) {
 220                         warnx("%s: device already a swap device", name);
 221                         exit(1);
 222                 }
 223         }
 224
 225         /*
 226          * Get the size and offset of this parititon/device
 227          */
 228         fd = open(name, O_RDWR);
 229         if (fd < 0)
 230                 err(1, "Unable to open %s R+W", name);
 231         if (ioctl(fd, DIOCGPART, &pinfo) < 0) {
 232                 printf("Cannot trim regular file\n");
 233                 usage ();
 234         }
 235         off_t ioarg[2];
 236
 237         /*Trim the Device*/
 238         ioarg[0] = pinfo.media_offset;
 239         ioarg[1] = pinfo.media_size;
 240         printf("Trimming Device:%s, sectors (%llu -%llu)\n",name,
 241              (unsigned long long)ioarg[0]/512,
 242              (unsigned long long)ioarg[1]/512);
 243         if (ioctl(fd, IOCTLTRIM, ioarg) < 0) {
 244                 printf("Device trim failed\n");
 245                 usage ();
 246         }
 247         close(fd);
 248 }
 249
 250 static int
 251 swap_on_off(char *name, int doingall, int trim, int ask)
 252 {
 253
 254         if (ask && which_prog == SWAPON) {
 255                 printf("Do you really want to use device %s as a swap device ?\n", name);
 256                 printf("You might loose data. [Y/N]");
 257
 258                 int c = fgetc(stdin);
 259                 if (c != 'y' && c != 'Y')
 260                         return(1);
 261
 262         }
 263         if (which_prog == SWAPON && trim){
 264                 char sysctl_name[64];
 265                 int trim_enabled = 0;
 266                 size_t olen = sizeof(trim_enabled);
 267                 char *dev_name = strdup(name);
 268                 dev_name = strtok(dev_name + strlen("/dev/da"),"s");
 269                 sprintf(sysctl_name, "kern.cam.da.%s.trim_enabled", dev_name);
 270                 sysctlbyname(sysctl_name, &trim_enabled, &olen, NULL, 0);
 271                 if(errno == ENOENT) {
 272                         printf("Device:%s does not support the TRIM command\n",
 273                             name);
 274                         usage();
 275                 }
 276                 if(!trim_enabled) {
 277                         printf("Erase device option selected, but sysctl (%s) "
 278                             "is not enabled\n",sysctl_name);
 279                         usage();
 280                 }
 281
 282                 trim_volume(name);
 283
 284         }
 285         if ((which_prog == SWAPOFF ? swapoff(name) : swapon(name)) == -1) {
 286                 switch(errno) {
 287                 case EBUSY:
 288                         if (!doingall)
 289                                 warnx("%s: device already in use", name);
 290                         break;
 291                 case EINVAL:
 292                         if (which_prog == SWAPON)
 293                                 warnx("%s: NSWAPDEV limit reached", name);
 294                         else if (!doingall)
 295                                 warn("%s", name);
 296                         break;
 297                 default:
 298                         warn("%s", name);
 299                         break;
 300                 }
 301                 return(1);
 302         }
 303         return(0);
 304 }
 305
 306 static void
 307 usage(void)
 308 {
 309         fprintf(stderr, "usage: %s ", getprogname());
 310         switch (orig_prog) {
 311         case SWAPON:
 312         case SWAPOFF:
 313                 fprintf(stderr, "-aeiq | file ...\n");
 314                 break;
 315         case SWAPCTL:
 316                 fprintf(stderr, "[-AeghiklmsU] [-a file ... | -d file ...]\n");
 317                 break;
 318         }
 319         exit(1);
 320 }
 321
 322 static void
 323 sizetobuf(char *buf, size_t bufsize, int hflag, long long val, int hlen,
 324     long blocksize)
 325 {
 326         if (hflag == 'H') {
 327                 char tmp[16];
 328
 329                 humanize_number(tmp, 5, (int64_t)val, "", HN_AUTOSCALE,
 330                     HN_B | HN_NOSPACE | HN_DECIMAL);
 331                 snprintf(buf, bufsize, "%*s", hlen, tmp);
 332         } else {
 333                 snprintf(buf, bufsize, "%*lld", hlen, val / blocksize);
 334         }
 335 }
 336
 337 static void
 338 swaplist(int lflag, int sflag, int hflag)
 339 {
 340         size_t ksize, bytes = 0;
 341         char *xswbuf;
 342         struct xswdev *xsw;
 343         int hlen, pagesize;
 344         int i, n;
 345         long blocksize;
 346         long long total, used, tmp_total, tmp_used;
 347         char buf[32];
 348
 349         pagesize = getpagesize();
 350         switch(hflag) {
 351         case 'G':
 352                 blocksize = 1024 * 1024 * 1024;
 353                 strlcpy(buf, "1GB-blocks", sizeof(buf));
 354                 hlen = 10;
 355                 break;
 356         case 'H':
 357                 blocksize = -1;
 358                 strlcpy(buf, "Bytes", sizeof(buf));
 359                 hlen = 10;
 360                 break;
 361         case 'K':
 362                 blocksize = 1024;
 363                 strlcpy(buf, "1kB-blocks", sizeof(buf));
 364                 hlen = 10;
 365                 break;
 366         case 'M':
 367                 blocksize = 1024 * 1024;
 368                 strlcpy(buf, "1MB-blocks", sizeof(buf));
 369                 hlen = 10;
 370                 break;
 371         default:
 372                 getbsize(&hlen, &blocksize);
 373                 snprintf(buf, sizeof(buf), "%ld-blocks", blocksize);
 374                 break;
 375         }
 376
 377         if (sysctlbyname("vm.swap_info_array", NULL, &bytes, NULL, 0) < 0)
 378                 err(1, "sysctlbyname()");
 379         if (bytes == 0)
 380                 err(1, "sysctlbyname()");
 381
 382         xswbuf = malloc(bytes);
 383         if (sysctlbyname("vm.swap_info_array", xswbuf, &bytes, NULL, 0) < 0) {
 384                 free(xswbuf);
 385                 err(1, "sysctlbyname()");
 386         }
 387         if (bytes == 0) {
 388                 free(xswbuf);
 389                 err(1, "sysctlbyname()");
 390         }
 391
 392         /*
 393          * Calculate size of xsw entry returned by kernel (it can be larger
 394          * than the one we have if there is a version mismatch).
 395          */
 396         ksize = ((struct xswdev *)xswbuf)->xsw_size;
 397         n = (int)(bytes / ksize);
 398
 399         if (lflag) {
 400                 printf("%-13s %*s %*s\n",
 401                     "Device:",
 402                     hlen, buf,
 403                     hlen, "Used:");
 404         }
 405
 406         total = used = tmp_total = tmp_used = 0;
 407         for (i = 0; i < n; ++i) {
 408                 xsw = (void *)((char *)xswbuf + i * ksize);
 409
 410                 if (xsw->xsw_nblks == 0)
 411                         continue;
 412
 413                 tmp_total = (long long)xsw->xsw_nblks * pagesize;
 414                 tmp_used = (long long)xsw->xsw_used * pagesize;
 415                 total += tmp_total;
 416                 used += tmp_used;
 417                 if (lflag) {
 418                         sizetobuf(buf, sizeof(buf), hflag, tmp_total, hlen,
 419                             blocksize);
 420                         if (xsw->xsw_dev == NODEV) {
 421                                 printf("%-13s %s ", "[NFS swap]", buf);
 422                         } else {
 423                                 printf("/dev/%-8s %s ",
 424                                     devname(xsw->xsw_dev, S_IFCHR), buf);
 425                         }
 426
 427                         sizetobuf(buf, sizeof(buf), hflag, tmp_used, hlen,
 428                             blocksize);
 429                         printf("%s\n", buf);
 430                 }
 431         }
 432
 433         if (sflag) {
 434                 sizetobuf(buf, sizeof(buf), hflag, total, hlen, blocksize);
 435                 printf("Total:        %s ", buf);
 436                 sizetobuf(buf, sizeof(buf), hflag, used, hlen, blocksize);
 437                 printf("%s\n", buf);
 438         }
 439 }