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/linker.h>
38 #include <sys/diskslice.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 #include <bus/cam/scsi/scsi_daio.h>
52
53 static void usage(void);
54 static int swap_on_off(char *name, int doingall, int trim, int ask);
55 static char *docrypt(char *fs_spec, int pass);
56 static void swaplist(int lflag, int sflag, int hflag);
57
58 static int qflag;
59
60 enum { SWAPON, SWAPOFF, SWAPCTL } orig_prog, which_prog = SWAPCTL;
61
62 int
main(int argc,char ** argv)63 main(int argc, char **argv)
64 {
65 struct fstab *fsp;
66 char *ptr;
67 int ret;
68 int ch;
69 int doall, sflag, lflag, hflag, eflag, cflag, iflag;
70
71 if ((ptr = strrchr(argv[0], '/')) == NULL)
72 ptr = argv[0];
73 if (strstr(ptr, "swapon"))
74 which_prog = SWAPON;
75 else if (strstr(ptr, "swapoff"))
76 which_prog = SWAPOFF;
77 orig_prog = which_prog;
78
79 sflag = lflag = hflag = doall = eflag = cflag = iflag = 0;
80 while ((ch = getopt(argc, argv, "acdeghiklmqsAEU")) != -1) {
81 switch((char)ch) {
82 case 'A':
83 if (which_prog == SWAPCTL) {
84 doall = 1;
85 which_prog = SWAPON;
86 } else {
87 usage();
88 }
89 break;
90 case 'a':
91 if (which_prog == SWAPON || which_prog == SWAPOFF)
92 doall = 1;
93 else
94 which_prog = SWAPON;
95 break;
96 case 'd':
97 if (which_prog == SWAPCTL)
98 which_prog = SWAPOFF;
99 else
100 usage();
101 break;
102 case 'c':
103 cflag = 1;
104 break;
105 case 'E':
106 case 'e':
107 eflag = 1;
108 break;
109 case 'g':
110 hflag = 'G';
111 break;
112 case 'h':
113 hflag = 'H';
114 break;
115 case 'i':
116 iflag = 1;
117 break;
118 case 'k':
119 hflag = 'K';
120 break;
121 case 'l':
122 lflag = 1;
123 break;
124 case 'm':
125 hflag = 'M';
126 break;
127 case 'q':
128 if (which_prog == SWAPON || which_prog == SWAPOFF)
129 qflag = 1;
130 break;
131 case 's':
132 sflag = 1;
133 break;
134 case 'U':
135 if (which_prog == SWAPCTL) {
136 doall = 1;
137 which_prog = SWAPOFF;
138 } else {
139 usage();
140 }
141 break;
142 case '?':
143 default:
144 usage();
145 }
146 }
147 argv += optind;
148
149 ret = 0;
150 if (which_prog == SWAPON || which_prog == SWAPOFF) {
151 if (doall) {
152 while ((fsp = getfsent()) != NULL) {
153 char *fs_spec;
154 int dotrim = eflag;
155
156 if (strcmp(fsp->fs_type, FSTAB_SW))
157 continue;
158 if (strstr(fsp->fs_mntops, "noauto"))
159 continue;
160
161 if (strstr(fsp->fs_mntops, "notrim"))
162 dotrim = 0;
163 else if (strstr(fsp->fs_mntops, "trim"))
164 dotrim = 1;
165
166 if (cflag || strstr(fsp->fs_mntops, "crypt"))
167 fs_spec = docrypt(fsp->fs_spec, 1);
168 else
169 fs_spec = strdup(fsp->fs_spec);
170 if (swap_on_off(fs_spec, 1, dotrim, iflag)) {
171 ret = 1;
172 } else {
173 if (cflag ||
174 strstr(fsp->fs_mntops, "crypt")) {
175 docrypt(fsp->fs_spec, 2);
176 }
177 if (!qflag) {
178 printf("%s: %sing %s as swap "
179 "device\n",
180 getprogname(),
181 (which_prog == SWAPOFF ?
182 "remov" : "add"),
183 fs_spec);
184 }
185 }
186 free(fs_spec);
187 }
188 } else if (*argv == NULL) {
189 usage();
190 }
191 for (; *argv; ++argv) {
192 char *ospec = getdevpath(*argv, 0);
193 char *fs_spec;
194 if (cflag)
195 fs_spec = docrypt(ospec, 1);
196 else
197 fs_spec = strdup(ospec);
198 if (swap_on_off(fs_spec, 0, eflag, iflag)) {
199 ret = 1;
200 } else {
201 if (cflag)
202 docrypt(ospec, 2);
203 if (!qflag) {
204 printf("%s: %sing %s as swap device\n",
205 getprogname(),
206 (which_prog == SWAPOFF ?
207 "remov" : "add"),
208 fs_spec);
209 }
210 }
211 free(fs_spec);
212 }
213 } else {
214 if (lflag || sflag)
215 swaplist(lflag, sflag, hflag);
216 else
217 usage();
218 }
219 exit(ret);
220 }
221
222 static
223 char *
docrypt(char * fs_spec,int pass)224 docrypt(char *fs_spec, int pass)
225 {
226 char *id;
227 char *res;
228 char *buf;
229
230 if ((id = strrchr(fs_spec, '/')) == NULL)
231 id = fs_spec;
232 else
233 ++id;
234 asprintf(&id, "swap-%s", id);
235 asprintf(&res, "/dev/mapper/%s", id);
236
237 switch(which_prog) {
238 case SWAPOFF:
239 if (pass != 2)
240 break;
241 asprintf(&buf, "/sbin/cryptsetup remove %s", id);
242 system(buf);
243 free(buf);
244 free(id);
245 break;
246 case SWAPON:
247 if (pass != 1)
248 break;
249 if (kldfind("dm_target_crypt") < 0)
250 kldload("dm_target_crypt");
251
252 asprintf(&buf,
253 "/sbin/cryptsetup --key-file /dev/urandom "
254 "--key-size 256 create %s %s",
255 id, fs_spec);
256 if (qflag == 0)
257 printf("%s\n", buf);
258 system(buf);
259 free(buf);
260 free(id);
261
262 /*
263 * NOTE: Don't revert to /dev/da* on error because this could
264 * inadvertently add both /dev/da* and
265 * /dev/mapper/swap-da*.
266 *
267 * Allow the swapon operation to report failure or
268 * report a duplicate.
269 */
270 break;
271 default:
272 free(res);
273 free(id);
274 res = strdup(fs_spec);
275 break;
276 }
277
278 if (pass == 2) {
279 free (res);
280 res = NULL;
281 }
282 return res;
283 }
284
285 /*
286 * TRIM the device
287 */
288 static
289 void
trim_volume(char * name)290 trim_volume(char * name)
291 {
292 struct partinfo pinfo;
293 int fd,i,n;
294 size_t bytes = 0,ksize;
295 char *xswbuf;
296 struct xswdev *xsw;
297
298
299 /*
300 * Determine if this device is already being used by swap without
301 * calling swapon().
302 */
303 if ((sysctlbyname("vm.swap_info_array", NULL, &bytes, NULL, 0) < 0) ||
304 bytes == 0) {
305 err(1, "sysctlbyname()");
306 }
307
308 xswbuf = malloc(bytes);
309 if ((sysctlbyname("vm.swap_info_array", xswbuf, &bytes, NULL, 0) < 0) ||
310 bytes == 0) {
311 free(xswbuf);
312 err(1, "sysctlbyname()");
313 }
314
315 ksize = ((struct xswdev *)xswbuf)->xsw_size;
316 n = (int)(bytes / ksize);
317 for (i = 0; i < n; ++i) {
318 xsw = (void *)((char *)xswbuf + i * ksize);
319
320 if (xsw->xsw_dev == NODEV )
321 continue;
322 if(!strcmp(devname(xsw->xsw_dev, S_IFCHR),
323 name + strlen("/dev/"))) {
324 warnx("%s: device already a swap device", name);
325 exit(1);
326 }
327 }
328
329 /*
330 * Get the size and offset of this parititon/device
331 */
332 fd = open(name, O_RDWR);
333 if (fd < 0)
334 err(1, "Unable to open %s R+W", name);
335 if (ioctl(fd, DIOCGPART, &pinfo) < 0) {
336 printf("Cannot trim regular file\n");
337 usage ();
338 }
339 off_t ioarg[2];
340
341 /*Trim the Device*/
342 ioarg[0] = pinfo.media_offset;
343 ioarg[1] = pinfo.media_size;
344 printf("Trimming Device:%s, start=%jd bytes=%jd)\n",
345 name, (intmax_t)ioarg[0], (intmax_t)ioarg[1]);
346 if (ioctl(fd, DAIOCTRIM, ioarg) < 0) {
347 printf("Device trim failed\n");
348 }
349 close(fd);
350 }
351
352 static int
swap_on_off(char * name,int doingall,int trim,int ask)353 swap_on_off(char *name, int doingall, int trim, int ask)
354 {
355
356 if (ask && which_prog == SWAPON) {
357 printf("Do you really want to use device %s as a swap device ?\n", name);
358 printf("You might loose data. [Y/N]");
359
360 int c = fgetc(stdin);
361 printf("\n");
362 if (c != 'y' && c != 'Y')
363 return(1);
364
365 }
366 if (which_prog == SWAPON && trim) {
367 trim_volume(name);
368 }
369 if ((which_prog == SWAPOFF ? swapoff(name) : swapon(name)) == -1) {
370 switch(errno) {
371 case EBUSY:
372 if (!doingall)
373 warnx("%s: device already in use", name);
374 break;
375 case EINVAL:
376 if (which_prog == SWAPON)
377 warnx("%s: NSWAPDEV limit reached", name);
378 else if (!doingall)
379 warn("%s", name);
380 break;
381 default:
382 warn("%s", name);
383 break;
384 }
385 return(1);
386 }
387 return(0);
388 }
389
390 static void
usage(void)391 usage(void)
392 {
393 fprintf(stderr, "usage: %s ", getprogname());
394 switch (orig_prog) {
395 case SWAPON:
396 case SWAPOFF:
397 fprintf(stderr, "-aeiq | file ...\n");
398 break;
399 case SWAPCTL:
400 fprintf(stderr, "[-AeghiklmsU] [-a file ... | -d file ...]\n");
401 break;
402 }
403 exit(1);
404 }
405
406 static void
sizetobuf(char * buf,size_t bufsize,int hflag,long long val,int hlen,long blocksize)407 sizetobuf(char *buf, size_t bufsize, int hflag, long long val, int hlen,
408 long blocksize)
409 {
410 if (hflag == 'H') {
411 char tmp[16];
412
413 humanize_number(tmp, 5, (int64_t)val, "", HN_AUTOSCALE,
414 HN_B | HN_NOSPACE | HN_DECIMAL);
415 snprintf(buf, bufsize, "%*s", hlen, tmp);
416 } else {
417 snprintf(buf, bufsize, "%*lld", hlen, val / blocksize);
418 }
419 }
420
421 static void
swaplist(int lflag,int sflag,int hflag)422 swaplist(int lflag, int sflag, int hflag)
423 {
424 size_t ksize, bytes = 0;
425 char *xswbuf;
426 struct xswdev *xsw;
427 int hlen, pagesize;
428 int i, n;
429 long blocksize;
430 long long total, used, tmp_total, tmp_used;
431 char buf[32];
432
433 pagesize = getpagesize();
434 switch(hflag) {
435 case 'G':
436 blocksize = 1024 * 1024 * 1024;
437 strlcpy(buf, "1GB-blocks", sizeof(buf));
438 hlen = 10;
439 break;
440 case 'H':
441 blocksize = -1;
442 strlcpy(buf, "Bytes", sizeof(buf));
443 hlen = 10;
444 break;
445 case 'K':
446 blocksize = 1024;
447 strlcpy(buf, "1kB-blocks", sizeof(buf));
448 hlen = 10;
449 break;
450 case 'M':
451 blocksize = 1024 * 1024;
452 strlcpy(buf, "1MB-blocks", sizeof(buf));
453 hlen = 10;
454 break;
455 default:
456 getbsize(&hlen, &blocksize);
457 snprintf(buf, sizeof(buf), "%ld-blocks", blocksize);
458 break;
459 }
460
461 if (sysctlbyname("vm.swap_info_array", NULL, &bytes, NULL, 0) < 0)
462 err(1, "sysctlbyname()");
463 if (bytes == 0)
464 err(1, "sysctlbyname()");
465
466 xswbuf = malloc(bytes);
467 if (sysctlbyname("vm.swap_info_array", xswbuf, &bytes, NULL, 0) < 0) {
468 free(xswbuf);
469 err(1, "sysctlbyname()");
470 }
471 if (bytes == 0) {
472 free(xswbuf);
473 err(1, "sysctlbyname()");
474 }
475
476 /*
477 * Calculate size of xsw entry returned by kernel (it can be larger
478 * than the one we have if there is a version mismatch).
479 */
480 ksize = ((struct xswdev *)xswbuf)->xsw_size;
481 n = (int)(bytes / ksize);
482
483 if (lflag) {
484 printf("%-13s %*s %*s\n",
485 "Device:",
486 hlen, buf,
487 hlen, "Used:");
488 }
489
490 total = used = tmp_total = tmp_used = 0;
491 for (i = 0; i < n; ++i) {
492 xsw = (void *)((char *)xswbuf + i * ksize);
493
494 if (xsw->xsw_nblks == 0)
495 continue;
496
497 tmp_total = (long long)xsw->xsw_nblks * pagesize;
498 tmp_used = (long long)xsw->xsw_used * pagesize;
499 total += tmp_total;
500 used += tmp_used;
501 if (lflag) {
502 sizetobuf(buf, sizeof(buf), hflag, tmp_total, hlen,
503 blocksize);
504 if (xsw->xsw_dev == NODEV) {
505 printf("%-13s %s ", "[NFS swap]", buf);
506 } else {
507 printf("/dev/%-8s %s ",
508 devname(xsw->xsw_dev, S_IFCHR), buf);
509 }
510
511 sizetobuf(buf, sizeof(buf), hflag, tmp_used, hlen,
512 blocksize);
513 printf("%s\n", buf);
514 }
515 }
516
517 if (sflag) {
518 sizetobuf(buf, sizeof(buf), hflag, total, hlen, blocksize);
519 printf("Total: %s ", buf);
520 sizetobuf(buf, sizeof(buf), hflag, used, hlen, blocksize);
521 printf("%s\n", buf);
522 }
523 }
524