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);
  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;
  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 = 0;
  75         while ((ch = getopt(argc, argv, "AadeghklmqsU")) != -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 'k':
 107                         hflag = 'K';
 108                         break;
 109                 case 'l':
 110                         lflag = 1;
 111                         break;
 112                 case 'm':
 113                         hflag = 'M';
 114                         break;
 115                 case 'q':
 116                         if (which_prog == SWAPON || which_prog == SWAPOFF)
 117                                 qflag = 1;
 118                         break;
 119                 case 's':
 120                         sflag = 1;
 121                         break;
 122                 case 'U':
 123                         if (which_prog == SWAPCTL) {
 124                                 doall = 1;
 125                                 which_prog = SWAPOFF;
 126                         } else {
 127                                 usage();
 128                         }
 129                         break;
 130                 case '?':
 131                 default:
 132                         usage();
 133                 }
 134         }
 135         argv += optind;
 136
 137         ret = 0;
 138         if (which_prog == SWAPON || which_prog == SWAPOFF) {
 139                 if (doall) {
 140                         while ((fsp = getfsent()) != NULL) {
 141                                 if (strcmp(fsp->fs_type, FSTAB_SW))
 142                                         continue;
 143                                 if (strstr(fsp->fs_mntops, "noauto"))
 144                                         continue;
 145                                 if (swap_on_off(fsp->fs_spec, 1, eflag)) {
 146                                         ret = 1;
 147                                 } else {
 148                                         if (!qflag) {
 149                                                 printf("%s: %sing %s as swap device\n",
 150                                                     getprogname(),
 151                                                     which_prog == SWAPOFF ? "remov" : "add",
 152                                                     fsp->fs_spec);
 153                                         }
 154                                 }
 155                         }
 156                 } else if (*argv == NULL) {
 157                         usage();
 158                 }
 159                 for (; *argv; ++argv) {
 160                         if (swap_on_off(getdevpath(*argv, 0), 0, eflag)) {
 161                                 ret = 1;
 162                         } else if (orig_prog == SWAPCTL) {
 163                                 printf("%s: %sing %s as swap device\n",
 164                                     getprogname(),
 165                                     which_prog == SWAPOFF ? "remov" : "add",
 166                                     *argv);
 167                         }
 168                 }
 169         } else {
 170                 if (lflag || sflag)
 171                         swaplist(lflag, sflag, hflag);
 172                 else
 173                         usage();
 174         }
 175         exit(ret);
 176 }
 177
 178 /*
 179  * TRIM the device
 180  */
 181 static
 182 void
 183 trim_volume(char * name)
 184 {
 185         struct partinfo pinfo;
 186         int fd,i,n;
 187         size_t bytes = 0,ksize;
 188         char *xswbuf;
 189         struct xswdev *xsw;
 190
 191
 192         /*
 193         * Determine if this device is already being used by swap without
 194         * calling swapon().
 195         */
 196         if ((sysctlbyname("vm.swap_info_array", NULL, &bytes, NULL, 0) < 0) ||
 197             bytes == 0) {
 198                 err(1, "sysctlbyname()");
 199         }
 200
 201         xswbuf = malloc(bytes);
 202         if ((sysctlbyname("vm.swap_info_array", xswbuf, &bytes, NULL, 0) < 0) ||
 203             bytes == 0) {
 204                         free(xswbuf);
 205                         err(1, "sysctlbyname()");
 206         }
 207
 208         ksize = ((struct xswdev *)xswbuf)->xsw_size;
 209         n = (int)(bytes / ksize);
 210         for (i = 0; i < n; ++i) {
 211                 xsw = (void *)((char *)xswbuf + i * ksize);
 212
 213                 if (xsw->xsw_dev == NODEV )
 214                         continue;
 215                 if(!strcmp(devname(xsw->xsw_dev, S_IFCHR),
 216                     name + strlen("/dev/"))) {
 217                         warnx("%s: device already a swap device", name);
 218                         exit(1);
 219                 }
 220         }
 221
 222         /*
 223          * Get the size and offset of this parititon/device
 224          */
 225         fd = open(name, O_RDWR);
 226         if (fd < 0)
 227                 err(1, "Unable to open %s R+W", name);
 228         if (ioctl(fd, DIOCGPART, &pinfo) < 0) {
 229                 printf("Cannot trim regular file\n");
 230                 usage ();
 231         }
 232         off_t ioarg[2];
 233
 234         /*Trim the Device*/
 235         ioarg[0] = pinfo.media_offset;
 236         ioarg[1] = pinfo.media_size;
 237         printf("Trimming Device:%s, sectors (%llu -%llu)\n",name,
 238              (unsigned long long)ioarg[0]/512,
 239              (unsigned long long)ioarg[1]/512);
 240         if (ioctl(fd, IOCTLTRIM, ioarg) < 0) {
 241                 printf("Device trim failed\n");
 242                 usage ();
 243         }
 244         close(fd);
 245 }
 246
 247 static int
 248 swap_on_off(char *name, int doingall, int trim)
 249 {
 250         if (which_prog == SWAPON && trim){
 251                 char sysctl_name[64];
 252                 int trim_enabled = 0;
 253                 size_t olen = sizeof(trim_enabled);
 254                 char *dev_name = strdup(name);
 255                 dev_name = strtok(dev_name + strlen("/dev/da"),"s");
 256                 sprintf(sysctl_name, "kern.cam.da.%s.trim_enabled", dev_name);
 257                 sysctlbyname(sysctl_name, &trim_enabled, &olen, NULL, 0);
 258                 if(errno == ENOENT) {
 259                         printf("Device:%s does not support the TRIM command\n",
 260                             name);
 261                         usage();
 262                 }
 263                 if(!trim_enabled) {
 264                         printf("Erase device option selected, but sysctl (%s) "
 265                             "is not enabled\n",sysctl_name);
 266                         usage();
 267                 }
 268
 269                 trim_volume(name);
 270
 271         }
 272         if ((which_prog == SWAPOFF ? swapoff(name) : swapon(name)) == -1) {
 273                 switch(errno) {
 274                 case EBUSY:
 275                         if (!doingall)
 276                                 warnx("%s: device already in use", name);
 277                         break;
 278                 case EINVAL:
 279                         if (which_prog == SWAPON)
 280                                 warnx("%s: NSWAPDEV limit reached", name);
 281                         else if (!doingall)
 282                                 warn("%s", name);
 283                         break;
 284                 default:
 285                         warn("%s", name);
 286                         break;
 287                 }
 288                 return(1);
 289         }
 290         return(0);
 291 }
 292
 293 static void
 294 usage(void)
 295 {
 296         fprintf(stderr, "usage: %s ", getprogname());
 297         switch (orig_prog) {
 298         case SWAPON:
 299         case SWAPOFF:
 300                 fprintf(stderr, "-aeq | file ...\n");
 301                 break;
 302         case SWAPCTL:
 303                 fprintf(stderr, "[-AeghklmsU] [-a file ... | -d file ...]\n");
 304                 break;
 305         }
 306         exit(1);
 307 }
 308
 309 static void
 310 sizetobuf(char *buf, size_t bufsize, int hflag, long long val, int hlen,
 311     long blocksize)
 312 {
 313         if (hflag == 'H') {
 314                 char tmp[16];
 315
 316                 humanize_number(tmp, 5, (int64_t)val, "", HN_AUTOSCALE,
 317                     HN_B | HN_NOSPACE | HN_DECIMAL);
 318                 snprintf(buf, bufsize, "%*s", hlen, tmp);
 319         } else {
 320                 snprintf(buf, bufsize, "%*lld", hlen, val / blocksize);
 321         }
 322 }
 323
 324 static void
 325 swaplist(int lflag, int sflag, int hflag)
 326 {
 327         size_t ksize, bytes = 0;
 328         char *xswbuf;
 329         struct xswdev *xsw;
 330         int hlen, pagesize;
 331         int i, n;
 332         long blocksize;
 333         long long total, used, tmp_total, tmp_used;
 334         char buf[32];
 335
 336         pagesize = getpagesize();
 337         switch(hflag) {
 338         case 'G':
 339                 blocksize = 1024 * 1024 * 1024;
 340                 strlcpy(buf, "1GB-blocks", sizeof(buf));
 341                 hlen = 10;
 342                 break;
 343         case 'H':
 344                 blocksize = -1;
 345                 strlcpy(buf, "Bytes", sizeof(buf));
 346                 hlen = 10;
 347                 break;
 348         case 'K':
 349                 blocksize = 1024;
 350                 strlcpy(buf, "1kB-blocks", sizeof(buf));
 351                 hlen = 10;
 352                 break;
 353         case 'M':
 354                 blocksize = 1024 * 1024;
 355                 strlcpy(buf, "1MB-blocks", sizeof(buf));
 356                 hlen = 10;
 357                 break;
 358         default:
 359                 getbsize(&hlen, &blocksize);
 360                 snprintf(buf, sizeof(buf), "%ld-blocks", blocksize);
 361                 break;
 362         }
 363
 364         if (sysctlbyname("vm.swap_info_array", NULL, &bytes, NULL, 0) < 0)
 365                 err(1, "sysctlbyname()");
 366         if (bytes == 0)
 367                 err(1, "sysctlbyname()");
 368
 369         xswbuf = malloc(bytes);
 370         if (sysctlbyname("vm.swap_info_array", xswbuf, &bytes, NULL, 0) < 0) {
 371                 free(xswbuf);
 372                 err(1, "sysctlbyname()");
 373         }
 374         if (bytes == 0) {
 375                 free(xswbuf);
 376                 err(1, "sysctlbyname()");
 377         }
 378
 379         /*
 380          * Calculate size of xsw entry returned by kernel (it can be larger
 381          * than the one we have if there is a version mismatch).
 382          */
 383         ksize = ((struct xswdev *)xswbuf)->xsw_size;
 384         n = (int)(bytes / ksize);
 385
 386         if (lflag) {
 387                 printf("%-13s %*s %*s\n",
 388                     "Device:",
 389                     hlen, buf,
 390                     hlen, "Used:");
 391         }
 392
 393         total = used = tmp_total = tmp_used = 0;
 394         for (i = 0; i < n; ++i) {
 395                 xsw = (void *)((char *)xswbuf + i * ksize);
 396
 397                 if (xsw->xsw_nblks == 0)
 398                         continue;
 399
 400                 tmp_total = (long long)xsw->xsw_nblks * pagesize;
 401                 tmp_used = (long long)xsw->xsw_used * pagesize;
 402                 total += tmp_total;
 403                 used += tmp_used;
 404                 if (lflag) {
 405                         sizetobuf(buf, sizeof(buf), hflag, tmp_total, hlen,
 406                             blocksize);
 407                         if (xsw->xsw_dev == NODEV) {
 408                                 printf("%-13s %s ", "[NFS swap]", buf);
 409                         } else {
 410                                 printf("/dev/%-8s %s ",
 411                                     devname(xsw->xsw_dev, S_IFCHR), buf);
 412                         }
 413
 414                         sizetobuf(buf, sizeof(buf), hflag, tmp_used, hlen,
 415                             blocksize);
 416                         printf("%s\n", buf);
 417                 }
 418         }
 419
 420         if (sflag) {
 421                 sizetobuf(buf, sizeof(buf), hflag, total, hlen, blocksize);
 422                 printf("Total:        %s ", buf);
 423                 sizetobuf(buf, sizeof(buf), hflag, used, hlen, blocksize);
 424                 printf("%s\n", buf);
 425         }
 426 }