xref: /freebsd/sbin/mdconfig/mdconfig.c (revision dd41de95a84d979615a2ef11df6850622bf6184e)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2000-2004 Poul-Henning Kamp <phk@FreeBSD.org>
5  * Copyright (c) 2012 The FreeBSD Foundation
6  * All rights reserved.
7  *
8  * Portions of this software were developed by Edward Tomasz Napierala
9  * under sponsorship from the FreeBSD Foundation.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  * $FreeBSD$
33  */
34 
35 #include <sys/param.h>
36 #include <sys/devicestat.h>
37 #include <sys/ioctl.h>
38 #include <sys/linker.h>
39 #include <sys/mdioctl.h>
40 #include <sys/module.h>
41 #include <sys/resource.h>
42 #include <sys/stat.h>
43 
44 #include <assert.h>
45 #include <devstat.h>
46 #include <err.h>
47 #include <errno.h>
48 #include <fcntl.h>
49 #include <inttypes.h>
50 #include <libgeom.h>
51 #include <libutil.h>
52 #include <paths.h>
53 #include <stdarg.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57 #include <unistd.h>
58 
59 static struct md_ioctl mdio;
60 static enum {UNSET, ATTACH, DETACH, RESIZE, LIST} action = UNSET;
61 static int nflag;
62 
63 static void usage(void);
64 static void md_set_file(const char *);
65 static int md_find(const char *, const char *);
66 static int md_query(const char *, const int, const char *);
67 static int md_list(const char *, int, const char *);
68 static char *geom_config_get(struct gconf *g, const char *name);
69 static void md_prthumanval(char *length);
70 
71 #define OPT_VERBOSE	0x01
72 #define OPT_UNIT	0x02
73 #define OPT_DONE	0x04
74 #define OPT_LIST	0x10
75 
76 #define CLASS_NAME_MD	"MD"
77 
78 static void
79 usage(void)
80 {
81 
82 	fprintf(stderr,
83 "usage: mdconfig -a -t type [-n] [-o [no]option] ... [-f file]\n"
84 "                [-s size] [-S sectorsize] [-u unit] [-L label]\n"
85 "                [-x sectors/track] [-y heads/cylinder]\n"
86 "       mdconfig -d -u unit [-o [no]force]\n"
87 "       mdconfig -r -u unit -s size [-o [no]force]\n"
88 "       mdconfig -l [-v] [-n] [-f file] [-u unit]\n"
89 "       mdconfig file\n");
90 	fprintf(stderr, "\t\ttype = {malloc, vnode, swap}\n");
91 	fprintf(stderr, "\t\toption = {cache, cluster, compress, force,\n");
92 	fprintf(stderr, "\t\t          readonly, reserve, ro, verify}\n");
93 	fprintf(stderr, "\t\tsize = %%d (512 byte blocks), %%db (B),\n");
94 	fprintf(stderr, "\t\t       %%dk (kB), %%dm (MB), %%dg (GB), \n");
95 	fprintf(stderr, "\t\t       %%dt (TB), or %%dp (PB)\n");
96 	exit(1);
97 }
98 
99 int
100 main(int argc, char **argv)
101 {
102 	int ch, fd, i, vflag;
103 	char *p;
104 	char *fflag = NULL, *sflag = NULL, *tflag = NULL, *uflag = NULL;
105 
106 	bzero(&mdio, sizeof(mdio));
107 	mdio.md_file = malloc(PATH_MAX);
108 	mdio.md_label = malloc(PATH_MAX);
109 	if (mdio.md_file == NULL || mdio.md_label == NULL)
110 		err(1, "could not allocate memory");
111 	vflag = 0;
112 	bzero(mdio.md_file, PATH_MAX);
113 	bzero(mdio.md_label, PATH_MAX);
114 
115 	if (argc == 1)
116 		usage();
117 
118 	while ((ch = getopt(argc, argv, "ab:df:lno:rs:S:t:u:vx:y:L:")) != -1) {
119 		switch (ch) {
120 		case 'a':
121 			if (action != UNSET && action != ATTACH)
122 				errx(1, "-a is mutually exclusive "
123 				    "with -d, -r, and -l");
124 			action = ATTACH;
125 			break;
126 		case 'd':
127 			if (action != UNSET && action != DETACH)
128 				errx(1, "-d is mutually exclusive "
129 				    "with -a, -r, and -l");
130 			action = DETACH;
131 			mdio.md_options |= MD_AUTOUNIT;
132 			break;
133 		case 'r':
134 			if (action != UNSET && action != RESIZE)
135 				errx(1, "-r is mutually exclusive "
136 				    "with -a, -d, and -l");
137 			action = RESIZE;
138 			mdio.md_options |= MD_AUTOUNIT;
139 			break;
140 		case 'l':
141 			if (action != UNSET && action != LIST)
142 				errx(1, "-l is mutually exclusive "
143 				    "with -a, -r, and -d");
144 			action = LIST;
145 			mdio.md_options |= MD_AUTOUNIT;
146 			break;
147 		case 'n':
148 			nflag = 1;
149 			break;
150 		case 't':
151 			if (tflag != NULL)
152 				errx(1, "-t can be passed only once");
153 			tflag = optarg;
154 			if (!strcmp(optarg, "malloc")) {
155 				mdio.md_type = MD_MALLOC;
156 				mdio.md_options |= MD_AUTOUNIT | MD_COMPRESS;
157 			} else if (!strcmp(optarg, "vnode")) {
158 				mdio.md_type = MD_VNODE;
159 				mdio.md_options |= MD_CLUSTER | MD_AUTOUNIT | MD_COMPRESS;
160 			} else if (!strcmp(optarg, "swap")) {
161 				mdio.md_type = MD_SWAP;
162 				mdio.md_options |= MD_CLUSTER | MD_AUTOUNIT | MD_COMPRESS;
163 			} else if (!strcmp(optarg, "null")) {
164 				mdio.md_type = MD_NULL;
165 				mdio.md_options |= MD_CLUSTER | MD_AUTOUNIT | MD_COMPRESS;
166 			} else
167 				errx(1, "unknown type: %s", optarg);
168 			break;
169 		case 'f':
170 			if (fflag != NULL)
171 				errx(1, "-f can be passed only once");
172 			fflag = realpath(optarg, NULL);
173 			if (fflag == NULL)
174 				err(1, "realpath");
175 			break;
176 		case 'o':
177 			if (!strcmp(optarg, "async"))
178 				mdio.md_options |= MD_ASYNC;
179 			else if (!strcmp(optarg, "noasync"))
180 				mdio.md_options &= ~MD_ASYNC;
181 			else if (!strcmp(optarg, "cache"))
182 				mdio.md_options |= MD_CACHE;
183 			else if (!strcmp(optarg, "nocache"))
184 				mdio.md_options &= ~MD_CACHE;
185 			else if (!strcmp(optarg, "cluster"))
186 				mdio.md_options |= MD_CLUSTER;
187 			else if (!strcmp(optarg, "nocluster"))
188 				mdio.md_options &= ~MD_CLUSTER;
189 			else if (!strcmp(optarg, "compress"))
190 				mdio.md_options |= MD_COMPRESS;
191 			else if (!strcmp(optarg, "nocompress"))
192 				mdio.md_options &= ~MD_COMPRESS;
193 			else if (!strcmp(optarg, "force"))
194 				mdio.md_options |= MD_FORCE;
195 			else if (!strcmp(optarg, "noforce"))
196 				mdio.md_options &= ~MD_FORCE;
197 			else if (!strcmp(optarg, "readonly"))
198 				mdio.md_options |= MD_READONLY;
199 			else if (!strcmp(optarg, "noreadonly"))
200 				mdio.md_options &= ~MD_READONLY;
201 			else if (!strcmp(optarg, "ro"))
202 				mdio.md_options |= MD_READONLY;
203 			else if (!strcmp(optarg, "noro"))
204 				mdio.md_options &= ~MD_READONLY;
205 			else if (!strcmp(optarg, "reserve"))
206 				mdio.md_options |= MD_RESERVE;
207 			else if (!strcmp(optarg, "noreserve"))
208 				mdio.md_options &= ~MD_RESERVE;
209 			else if (!strcmp(optarg, "verify"))
210 				mdio.md_options |= MD_VERIFY;
211 			else if (!strcmp(optarg, "noverify"))
212 				mdio.md_options &= ~MD_VERIFY;
213 			else
214 				errx(1, "unknown option: %s", optarg);
215 			break;
216 		case 'S':
217 			mdio.md_sectorsize = strtoul(optarg, &p, 0);
218 			break;
219 		case 's':
220 			if (sflag != NULL)
221 				errx(1, "-s can be passed only once");
222 			sflag = optarg;
223 			mdio.md_mediasize = (off_t)strtoumax(optarg, &p, 0);
224 			if (p == NULL || *p == '\0')
225 				mdio.md_mediasize *= DEV_BSIZE;
226 			else if (*p == 'b' || *p == 'B')
227 				; /* do nothing */
228 			else if (*p == 'k' || *p == 'K')
229 				mdio.md_mediasize <<= 10;
230 			else if (*p == 'm' || *p == 'M')
231 				mdio.md_mediasize <<= 20;
232 			else if (*p == 'g' || *p == 'G')
233 				mdio.md_mediasize <<= 30;
234 			else if (*p == 't' || *p == 'T') {
235 				mdio.md_mediasize <<= 30;
236 				mdio.md_mediasize <<= 10;
237 			} else if (*p == 'p' || *p == 'P') {
238 				mdio.md_mediasize <<= 30;
239 				mdio.md_mediasize <<= 20;
240 			} else
241 				errx(1, "unknown suffix on -s argument");
242 			break;
243 		case 'u':
244 			if (!strncmp(optarg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
245 				optarg += sizeof(_PATH_DEV) - 1;
246 			if (!strncmp(optarg, MD_NAME, sizeof(MD_NAME) - 1))
247 				optarg += sizeof(MD_NAME) - 1;
248 			uflag = optarg;
249 			break;
250 		case 'v':
251 			vflag = OPT_VERBOSE;
252 			break;
253 		case 'x':
254 			mdio.md_fwsectors = strtoul(optarg, &p, 0);
255 			break;
256 		case 'y':
257 			mdio.md_fwheads = strtoul(optarg, &p, 0);
258 			break;
259 		case 'L':
260 			strlcpy(mdio.md_label, optarg, PATH_MAX);
261 			break;
262 		default:
263 			usage();
264 		}
265 	}
266 
267 	argc -= optind;
268 	argv += optind;
269 
270 	if (action == UNSET)
271 		action = ATTACH;
272 
273 	if (action == ATTACH) {
274 		if (tflag == NULL) {
275 			/*
276 			 * Try to infer the type based on other arguments.
277 			 */
278 			if (fflag != NULL || argc > 0) {
279 				/* Imply ``-t vnode'' */
280 				mdio.md_type = MD_VNODE;
281 				mdio.md_options |= MD_CLUSTER | MD_AUTOUNIT |
282 				    MD_COMPRESS;
283 			} else if (sflag != NULL) {
284 				/* Imply ``-t swap'' */
285 				mdio.md_type = MD_SWAP;
286 				mdio.md_options |= MD_CLUSTER | MD_AUTOUNIT |
287 				    MD_COMPRESS;
288 			} else
289 				errx(1, "unable to determine type");
290 		}
291 
292 		if ((fflag != NULL || argc > 0) && mdio.md_type != MD_VNODE)
293 			errx(1, "only -t vnode can be used with file name");
294 
295 		if (mdio.md_type == MD_VNODE) {
296 			if (fflag != NULL) {
297 				if (argc != 0)
298 					usage();
299 				md_set_file(fflag);
300 			} else {
301 				if (argc != 1)
302 					usage();
303 				md_set_file(*argv);
304 			}
305 
306 			if ((mdio.md_options & MD_READONLY) == 0 &&
307 			    access(mdio.md_file, W_OK) < 0 &&
308 			    (errno == EACCES || errno == EPERM ||
309 			     errno == EROFS)) {
310 				warnx("WARNING: opening backing store: %s "
311 				    "readonly", mdio.md_file);
312 				mdio.md_options |= MD_READONLY;
313 			}
314 		}
315 
316 		if ((mdio.md_type == MD_MALLOC || mdio.md_type == MD_SWAP ||
317 		    mdio.md_type == MD_NULL) && sflag == NULL)
318 			errx(1, "must specify -s for -t malloc, -t swap, "
319 			    "or -t null");
320 		if (mdio.md_type == MD_VNODE && mdio.md_file[0] == '\0')
321 			errx(1, "must specify -f for -t vnode");
322 	} else {
323 		if (mdio.md_sectorsize != 0)
324 			errx(1, "-S can only be used with -a");
325 		if (action != RESIZE && sflag != NULL)
326 			errx(1, "-s can only be used with -a and -r");
327 		if (mdio.md_fwsectors != 0)
328 			errx(1, "-x can only be used with -a");
329 		if (mdio.md_fwheads != 0)
330 			errx(1, "-y can only be used with -a");
331 		if (fflag != NULL && action != LIST)
332 			errx(1, "-f can only be used with -a and -l");
333 		if (tflag != NULL)
334 			errx(1, "-t can only be used with -a");
335 		if (argc > 0)
336 			errx(1, "file can only be used with -a");
337 		if ((action != DETACH && action != RESIZE) &&
338 		    (mdio.md_options & ~MD_AUTOUNIT) != 0)
339 			errx(1, "-o can only be used with -a, -d, and -r");
340 		if (action == DETACH &&
341 		    (mdio.md_options & ~(MD_FORCE | MD_AUTOUNIT)) != 0)
342 			errx(1, "only -o [no]force can be used with -d");
343 		if (action == RESIZE &&
344 		    (mdio.md_options & ~(MD_FORCE | MD_RESERVE | MD_AUTOUNIT)) != 0)
345 			errx(1, "only -o [no]force and -o [no]reserve can be used with -r");
346 	}
347 
348 	if (action == RESIZE && sflag == NULL)
349 		errx(1, "must specify -s for -r");
350 
351 	if (action != LIST && vflag == OPT_VERBOSE)
352 		errx(1, "-v can only be used with -l");
353 
354 	if (uflag != NULL) {
355 		mdio.md_unit = strtoul(uflag, &p, 0);
356 		if (mdio.md_unit == (unsigned)ULONG_MAX || *p != '\0')
357 			errx(1, "bad unit: %s", uflag);
358 		mdio.md_options &= ~MD_AUTOUNIT;
359 	}
360 
361 	mdio.md_version = MDIOVERSION;
362 
363 	if (!kld_isloaded("g_md") && kld_load("geom_md") == -1)
364 		err(1, "failed to load geom_md module");
365 
366 	fd = open(_PATH_DEV MDCTL_NAME, O_RDWR, 0);
367 	if (fd < 0)
368 		err(1, "open(%s%s)", _PATH_DEV, MDCTL_NAME);
369 
370 	if (action == ATTACH) {
371 		i = ioctl(fd, MDIOCATTACH, &mdio);
372 		if (i < 0)
373 			err(1, "ioctl(%s%s)", _PATH_DEV, MDCTL_NAME);
374 		if (mdio.md_options & MD_AUTOUNIT)
375 			printf("%s%d\n", nflag ? "" : MD_NAME, mdio.md_unit);
376 	} else if (action == DETACH) {
377 		if (mdio.md_options & MD_AUTOUNIT)
378 			errx(1, "-d requires -u");
379 		i = ioctl(fd, MDIOCDETACH, &mdio);
380 		if (i < 0)
381 			err(1, "ioctl(%s%s)", _PATH_DEV, MDCTL_NAME);
382 	} else if (action == RESIZE) {
383 		if (mdio.md_options & MD_AUTOUNIT)
384 			errx(1, "-r requires -u");
385 		i = ioctl(fd, MDIOCRESIZE, &mdio);
386 		if (i < 0)
387 			err(1, "ioctl(%s%s)", _PATH_DEV, MDCTL_NAME);
388 	} else if (action == LIST) {
389 		if (mdio.md_options & MD_AUTOUNIT) {
390 			/*
391 			 * Listing all devices. This is why we pass NULL
392 			 * together with OPT_LIST.
393 			 */
394 			return (md_list(NULL, OPT_LIST | vflag, fflag));
395 		} else
396 			return (md_query(uflag, vflag, fflag));
397 	} else
398 		usage();
399 	close(fd);
400 	return (0);
401 }
402 
403 static void
404 md_set_file(const char *fn)
405 {
406 	struct stat sb;
407 	int fd;
408 
409 	if (realpath(fn, mdio.md_file) == NULL)
410 		err(1, "could not find full path for %s", fn);
411 	fd = open(mdio.md_file, O_RDONLY);
412 	if (fd < 0)
413 		err(1, "could not open %s", fn);
414 	if (fstat(fd, &sb) == -1)
415 		err(1, "could not stat %s", fn);
416 	if (!S_ISREG(sb.st_mode))
417 		errx(1, "%s is not a regular file", fn);
418 	if (mdio.md_mediasize == 0)
419 		mdio.md_mediasize = sb.st_size;
420 	close(fd);
421 }
422 
423 /*
424  * Lists md(4) disks. Is used also as a query routine, since it handles XML
425  * interface. 'units' can be NULL for listing memory disks. It might be
426  * comma-separated string containing md(4) disk names. 'opt' distinguished
427  * between list and query mode.
428  */
429 static int
430 md_list(const char *units, int opt, const char *fflag)
431 {
432 	struct gmesh gm;
433 	struct gprovider *pp;
434 	struct gconf *gc;
435 	struct gident *gid;
436 	struct devstat *gsp;
437 	struct ggeom *gg;
438 	struct gclass *gcl;
439 	void *sq;
440 	int retcode, ffound, ufound;
441 	char *length;
442 	const char *type, *file, *label;
443 
444 	type = file = length = NULL;
445 
446 	retcode = geom_gettree(&gm);
447 	if (retcode != 0)
448 		return (-1);
449 	retcode = geom_stats_open();
450 	if (retcode != 0)
451 		return (-1);
452 	sq = geom_stats_snapshot_get();
453 	if (sq == NULL)
454 		return (-1);
455 
456 	ffound = ufound = 0;
457 	while ((gsp = geom_stats_snapshot_next(sq)) != NULL) {
458 		gid = geom_lookupid(&gm, gsp->id);
459 		if (gid == NULL)
460 			continue;
461 		if (gid->lg_what == ISPROVIDER) {
462 			pp = gid->lg_ptr;
463 			gg = pp->lg_geom;
464 			gcl = gg->lg_class;
465 			if (strcmp(gcl->lg_name, CLASS_NAME_MD) != 0)
466 				continue;
467 			if ((opt & OPT_UNIT) && (units != NULL)) {
468 				retcode = md_find(units, pp->lg_name);
469 				if (retcode != 1)
470 					continue;
471 				else
472 					ufound = 1;
473 			}
474 			gc = &pp->lg_config;
475 			type = geom_config_get(gc, "type");
476 			if (type != NULL && (strcmp(type, "vnode") == 0 ||
477 			    strcmp(type, "preload") == 0)) {
478 				file = geom_config_get(gc, "file");
479 				if (fflag != NULL &&
480 				    strcmp(fflag, file) != 0)
481 					continue;
482 				else
483 					ffound = 1;
484 			} else if (fflag != NULL)
485 					continue;
486 			if (nflag && strncmp(pp->lg_name, MD_NAME, 2) == 0)
487 				printf("%s", pp->lg_name + 2);
488 			else
489 				printf("%s", pp->lg_name);
490 
491 			if (opt & OPT_VERBOSE ||
492 			    ((opt & OPT_UNIT) && fflag == NULL)) {
493 				length = geom_config_get(gc, "length");
494 				printf("\t%s\t", type);
495 				if (length != NULL)
496 					md_prthumanval(length);
497 				if (file == NULL)
498 					file = "-";
499 				printf("\t%s", file);
500 				file = NULL;
501 				label = geom_config_get(gc, "label");
502 				if (label == NULL)
503 					label = "";
504 				printf("\t%s", label);
505 			}
506 			opt |= OPT_DONE;
507 			if ((opt & OPT_LIST) && !(opt & OPT_VERBOSE))
508 				printf(" ");
509 			else
510 				printf("\n");
511 		}
512 	}
513 	if ((opt & OPT_LIST) && (opt & OPT_DONE) && !(opt & OPT_VERBOSE))
514 		printf("\n");
515 	/* XXX: Check if it's enough to clean everything. */
516 	geom_stats_snapshot_free(sq);
517 	if (opt & OPT_UNIT) {
518 		if (((fflag == NULL) && ufound) ||
519 		    ((fflag == NULL) && (units != NULL) && ufound) ||
520 		    ((fflag != NULL) && ffound) ||
521 		    ((fflag != NULL) && (units != NULL) && ufound && ffound))
522 			return (0);
523 	} else if (opt & OPT_LIST) {
524 		if ((fflag == NULL) ||
525 		    ((fflag != NULL) && ffound))
526 			return (0);
527 	}
528 	return (-1);
529 }
530 
531 /*
532  * Returns value of 'name' from gconfig structure.
533  */
534 static char *
535 geom_config_get(struct gconf *g, const char *name)
536 {
537 	struct gconfig *gce;
538 
539 	LIST_FOREACH(gce, g, lg_config) {
540 		if (strcmp(gce->lg_name, name) == 0)
541 			return (gce->lg_val);
542 	}
543 	return (NULL);
544 }
545 
546 /*
547  * List is comma separated list of MD disks. name is a
548  * device name we look for.  Returns 1 if found and 0
549  * otherwise.
550  */
551 static int
552 md_find(const char *list, const char *name)
553 {
554 	int ret;
555 	char num[PATH_MAX];
556 	char *ptr, *p, *u;
557 
558 	ret = 0;
559 	ptr = strdup(list);
560 	if (ptr == NULL)
561 		return (-1);
562 	for (p = ptr; (u = strsep(&p, ",")) != NULL;) {
563 		if (strncmp(u, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
564 			u += sizeof(_PATH_DEV) - 1;
565 		/* Just in case user specified number instead of full name */
566 		snprintf(num, sizeof(num), "%s%s", MD_NAME, u);
567 		if (strcmp(u, name) == 0 || strcmp(num, name) == 0) {
568 			ret = 1;
569 			break;
570 		}
571 	}
572 	free(ptr);
573 	return (ret);
574 }
575 
576 static void
577 md_prthumanval(char *length)
578 {
579 	char buf[6];
580 	uintmax_t bytes;
581 	char *endptr;
582 
583 	errno = 0;
584 	bytes = strtoumax(length, &endptr, 10);
585 	if (errno != 0 || *endptr != '\0' || bytes > INT64_MAX)
586 		return;
587 	humanize_number(buf, sizeof(buf), (int64_t)bytes, "",
588 	    HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
589 	(void)printf("%6s", buf);
590 }
591 
592 static int
593 md_query(const char *name, const int opt, const char *fflag)
594 {
595 
596 	return (md_list(name, opt | OPT_UNIT, fflag));
597 }
598