1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #pragma ident	"%Z%%M%	%I%	%E% SMI"
27 
28 #include <assert.h>
29 #include <fcntl.h>
30 #include <poll.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <zlib.h>
35 #include <sys/spa.h>
36 #include <sys/stat.h>
37 #include <sys/processor.h>
38 #include <sys/zfs_context.h>
39 #include <sys/zmod.h>
40 #include <sys/utsname.h>
41 
42 /*
43  * Emulation of kernel services in userland.
44  */
45 
46 uint64_t physmem;
47 vnode_t *rootdir = (vnode_t *)0xabcd1234;
48 char hw_serial[11];
49 
50 struct utsname utsname = {
51 	"userland", "libzpool", "1", "1", "na"
52 };
53 
54 /*
55  * =========================================================================
56  * threads
57  * =========================================================================
58  */
59 /*ARGSUSED*/
60 kthread_t *
61 zk_thread_create(void (*func)(), void *arg)
62 {
63 	thread_t tid;
64 
65 	VERIFY(thr_create(0, 0, (void *(*)(void *))func, arg, THR_DETACHED,
66 	    &tid) == 0);
67 
68 	return ((void *)(uintptr_t)tid);
69 }
70 
71 /*
72  * =========================================================================
73  * kstats
74  * =========================================================================
75  */
76 /*ARGSUSED*/
77 kstat_t *
78 kstat_create(char *module, int instance, char *name, char *class,
79     uchar_t type, ulong_t ndata, uchar_t ks_flag)
80 {
81 	return (NULL);
82 }
83 
84 /*ARGSUSED*/
85 void
86 kstat_install(kstat_t *ksp)
87 {}
88 
89 /*ARGSUSED*/
90 void
91 kstat_delete(kstat_t *ksp)
92 {}
93 
94 /*
95  * =========================================================================
96  * mutexes
97  * =========================================================================
98  */
99 void
100 zmutex_init(kmutex_t *mp)
101 {
102 	mp->m_owner = NULL;
103 	mp->initialized = B_TRUE;
104 	(void) _mutex_init(&mp->m_lock, USYNC_THREAD, NULL);
105 }
106 
107 void
108 zmutex_destroy(kmutex_t *mp)
109 {
110 	ASSERT(mp->initialized == B_TRUE);
111 	ASSERT(mp->m_owner == NULL);
112 	(void) _mutex_destroy(&(mp)->m_lock);
113 	mp->m_owner = (void *)-1UL;
114 	mp->initialized = B_FALSE;
115 }
116 
117 void
118 mutex_enter(kmutex_t *mp)
119 {
120 	ASSERT(mp->initialized == B_TRUE);
121 	ASSERT(mp->m_owner != (void *)-1UL);
122 	ASSERT(mp->m_owner != curthread);
123 	VERIFY(mutex_lock(&mp->m_lock) == 0);
124 	ASSERT(mp->m_owner == NULL);
125 	mp->m_owner = curthread;
126 }
127 
128 int
129 mutex_tryenter(kmutex_t *mp)
130 {
131 	ASSERT(mp->initialized == B_TRUE);
132 	ASSERT(mp->m_owner != (void *)-1UL);
133 	if (0 == mutex_trylock(&mp->m_lock)) {
134 		ASSERT(mp->m_owner == NULL);
135 		mp->m_owner = curthread;
136 		return (1);
137 	} else {
138 		return (0);
139 	}
140 }
141 
142 void
143 mutex_exit(kmutex_t *mp)
144 {
145 	ASSERT(mp->initialized == B_TRUE);
146 	ASSERT(mutex_owner(mp) == curthread);
147 	mp->m_owner = NULL;
148 	VERIFY(mutex_unlock(&mp->m_lock) == 0);
149 }
150 
151 void *
152 mutex_owner(kmutex_t *mp)
153 {
154 	ASSERT(mp->initialized == B_TRUE);
155 	return (mp->m_owner);
156 }
157 
158 /*
159  * =========================================================================
160  * rwlocks
161  * =========================================================================
162  */
163 /*ARGSUSED*/
164 void
165 rw_init(krwlock_t *rwlp, char *name, int type, void *arg)
166 {
167 	rwlock_init(&rwlp->rw_lock, USYNC_THREAD, NULL);
168 	rwlp->rw_owner = NULL;
169 	rwlp->initialized = B_TRUE;
170 }
171 
172 void
173 rw_destroy(krwlock_t *rwlp)
174 {
175 	rwlock_destroy(&rwlp->rw_lock);
176 	rwlp->rw_owner = (void *)-1UL;
177 	rwlp->initialized = B_FALSE;
178 }
179 
180 void
181 rw_enter(krwlock_t *rwlp, krw_t rw)
182 {
183 	ASSERT(!RW_LOCK_HELD(rwlp));
184 	ASSERT(rwlp->initialized == B_TRUE);
185 	ASSERT(rwlp->rw_owner != (void *)-1UL);
186 	ASSERT(rwlp->rw_owner != curthread);
187 
188 	if (rw == RW_READER)
189 		(void) rw_rdlock(&rwlp->rw_lock);
190 	else
191 		(void) rw_wrlock(&rwlp->rw_lock);
192 
193 	rwlp->rw_owner = curthread;
194 }
195 
196 void
197 rw_exit(krwlock_t *rwlp)
198 {
199 	ASSERT(rwlp->initialized == B_TRUE);
200 	ASSERT(rwlp->rw_owner != (void *)-1UL);
201 
202 	rwlp->rw_owner = NULL;
203 	(void) rw_unlock(&rwlp->rw_lock);
204 }
205 
206 int
207 rw_tryenter(krwlock_t *rwlp, krw_t rw)
208 {
209 	int rv;
210 
211 	ASSERT(rwlp->initialized == B_TRUE);
212 	ASSERT(rwlp->rw_owner != (void *)-1UL);
213 
214 	if (rw == RW_READER)
215 		rv = rw_tryrdlock(&rwlp->rw_lock);
216 	else
217 		rv = rw_trywrlock(&rwlp->rw_lock);
218 
219 	if (rv == 0) {
220 		rwlp->rw_owner = curthread;
221 		return (1);
222 	}
223 
224 	return (0);
225 }
226 
227 /*ARGSUSED*/
228 int
229 rw_tryupgrade(krwlock_t *rwlp)
230 {
231 	ASSERT(rwlp->initialized == B_TRUE);
232 	ASSERT(rwlp->rw_owner != (void *)-1UL);
233 
234 	return (0);
235 }
236 
237 /*
238  * =========================================================================
239  * condition variables
240  * =========================================================================
241  */
242 /*ARGSUSED*/
243 void
244 cv_init(kcondvar_t *cv, char *name, int type, void *arg)
245 {
246 	VERIFY(cond_init(cv, type, NULL) == 0);
247 }
248 
249 void
250 cv_destroy(kcondvar_t *cv)
251 {
252 	VERIFY(cond_destroy(cv) == 0);
253 }
254 
255 void
256 cv_wait(kcondvar_t *cv, kmutex_t *mp)
257 {
258 	ASSERT(mutex_owner(mp) == curthread);
259 	mp->m_owner = NULL;
260 	int ret = cond_wait(cv, &mp->m_lock);
261 	VERIFY(ret == 0 || ret == EINTR);
262 	mp->m_owner = curthread;
263 }
264 
265 clock_t
266 cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime)
267 {
268 	int error;
269 	timestruc_t ts;
270 	clock_t delta;
271 
272 top:
273 	delta = abstime - lbolt;
274 	if (delta <= 0)
275 		return (-1);
276 
277 	ts.tv_sec = delta / hz;
278 	ts.tv_nsec = (delta % hz) * (NANOSEC / hz);
279 
280 	ASSERT(mutex_owner(mp) == curthread);
281 	mp->m_owner = NULL;
282 	error = cond_reltimedwait(cv, &mp->m_lock, &ts);
283 	mp->m_owner = curthread;
284 
285 	if (error == ETIME)
286 		return (-1);
287 
288 	if (error == EINTR)
289 		goto top;
290 
291 	ASSERT(error == 0);
292 
293 	return (1);
294 }
295 
296 void
297 cv_signal(kcondvar_t *cv)
298 {
299 	VERIFY(cond_signal(cv) == 0);
300 }
301 
302 void
303 cv_broadcast(kcondvar_t *cv)
304 {
305 	VERIFY(cond_broadcast(cv) == 0);
306 }
307 
308 /*
309  * =========================================================================
310  * vnode operations
311  * =========================================================================
312  */
313 /*
314  * Note: for the xxxat() versions of these functions, we assume that the
315  * starting vp is always rootdir (which is true for spa_directory.c, the only
316  * ZFS consumer of these interfaces).  We assert this is true, and then emulate
317  * them by adding '/' in front of the path.
318  */
319 
320 /*ARGSUSED*/
321 int
322 vn_open(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2, int x3)
323 {
324 	int fd;
325 	vnode_t *vp;
326 	int old_umask;
327 	char realpath[MAXPATHLEN];
328 	struct stat64 st;
329 
330 	/*
331 	 * If we're accessing a real disk from userland, we need to use
332 	 * the character interface to avoid caching.  This is particularly
333 	 * important if we're trying to look at a real in-kernel storage
334 	 * pool from userland, e.g. via zdb, because otherwise we won't
335 	 * see the changes occurring under the segmap cache.
336 	 * On the other hand, the stupid character device returns zero
337 	 * for its size.  So -- gag -- we open the block device to get
338 	 * its size, and remember it for subsequent VOP_GETATTR().
339 	 */
340 	if (strncmp(path, "/dev/", 5) == 0) {
341 		char *dsk;
342 		fd = open64(path, O_RDONLY);
343 		if (fd == -1)
344 			return (errno);
345 		if (fstat64(fd, &st) == -1) {
346 			close(fd);
347 			return (errno);
348 		}
349 		close(fd);
350 		(void) sprintf(realpath, "%s", path);
351 		dsk = strstr(path, "/dsk/");
352 		if (dsk != NULL)
353 			(void) sprintf(realpath + (dsk - path) + 1, "r%s",
354 			    dsk + 1);
355 	} else {
356 		(void) sprintf(realpath, "%s", path);
357 		if (!(flags & FCREAT) && stat64(realpath, &st) == -1)
358 			return (errno);
359 	}
360 
361 	if (flags & FCREAT)
362 		old_umask = umask(0);
363 
364 	/*
365 	 * The construct 'flags - FREAD' conveniently maps combinations of
366 	 * FREAD and FWRITE to the corresponding O_RDONLY, O_WRONLY, and O_RDWR.
367 	 */
368 	fd = open64(realpath, flags - FREAD, mode);
369 
370 	if (flags & FCREAT)
371 		(void) umask(old_umask);
372 
373 	if (fd == -1)
374 		return (errno);
375 
376 	if (fstat64(fd, &st) == -1) {
377 		close(fd);
378 		return (errno);
379 	}
380 
381 	(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
382 
383 	*vpp = vp = umem_zalloc(sizeof (vnode_t), UMEM_NOFAIL);
384 
385 	vp->v_fd = fd;
386 	vp->v_size = st.st_size;
387 	vp->v_path = spa_strdup(path);
388 
389 	return (0);
390 }
391 
392 int
393 vn_openat(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2,
394     int x3, vnode_t *startvp)
395 {
396 	char *realpath = umem_alloc(strlen(path) + 2, UMEM_NOFAIL);
397 	int ret;
398 
399 	ASSERT(startvp == rootdir);
400 	(void) sprintf(realpath, "/%s", path);
401 
402 	ret = vn_open(realpath, x1, flags, mode, vpp, x2, x3);
403 
404 	umem_free(realpath, strlen(path) + 2);
405 
406 	return (ret);
407 }
408 
409 /*ARGSUSED*/
410 int
411 vn_rdwr(int uio, vnode_t *vp, void *addr, ssize_t len, offset_t offset,
412 	int x1, int x2, rlim64_t x3, void *x4, ssize_t *residp)
413 {
414 	ssize_t iolen, split;
415 
416 	if (uio == UIO_READ) {
417 		iolen = pread64(vp->v_fd, addr, len, offset);
418 	} else {
419 		/*
420 		 * To simulate partial disk writes, we split writes into two
421 		 * system calls so that the process can be killed in between.
422 		 */
423 		split = (len > 0 ? rand() % len : 0);
424 		iolen = pwrite64(vp->v_fd, addr, split, offset);
425 		iolen += pwrite64(vp->v_fd, (char *)addr + split,
426 		    len - split, offset + split);
427 	}
428 
429 	if (iolen == -1)
430 		return (errno);
431 	if (residp)
432 		*residp = len - iolen;
433 	else if (iolen != len)
434 		return (EIO);
435 	return (0);
436 }
437 
438 void
439 vn_close(vnode_t *vp)
440 {
441 	close(vp->v_fd);
442 	spa_strfree(vp->v_path);
443 	umem_free(vp, sizeof (vnode_t));
444 }
445 
446 #ifdef ZFS_DEBUG
447 
448 /*
449  * =========================================================================
450  * Figure out which debugging statements to print
451  * =========================================================================
452  */
453 
454 static char *dprintf_string;
455 static int dprintf_print_all;
456 
457 int
458 dprintf_find_string(const char *string)
459 {
460 	char *tmp_str = dprintf_string;
461 	int len = strlen(string);
462 
463 	/*
464 	 * Find out if this is a string we want to print.
465 	 * String format: file1.c,function_name1,file2.c,file3.c
466 	 */
467 
468 	while (tmp_str != NULL) {
469 		if (strncmp(tmp_str, string, len) == 0 &&
470 		    (tmp_str[len] == ',' || tmp_str[len] == '\0'))
471 			return (1);
472 		tmp_str = strchr(tmp_str, ',');
473 		if (tmp_str != NULL)
474 			tmp_str++; /* Get rid of , */
475 	}
476 	return (0);
477 }
478 
479 void
480 dprintf_setup(int *argc, char **argv)
481 {
482 	int i, j;
483 
484 	/*
485 	 * Debugging can be specified two ways: by setting the
486 	 * environment variable ZFS_DEBUG, or by including a
487 	 * "debug=..."  argument on the command line.  The command
488 	 * line setting overrides the environment variable.
489 	 */
490 
491 	for (i = 1; i < *argc; i++) {
492 		int len = strlen("debug=");
493 		/* First look for a command line argument */
494 		if (strncmp("debug=", argv[i], len) == 0) {
495 			dprintf_string = argv[i] + len;
496 			/* Remove from args */
497 			for (j = i; j < *argc; j++)
498 				argv[j] = argv[j+1];
499 			argv[j] = NULL;
500 			(*argc)--;
501 		}
502 	}
503 
504 	if (dprintf_string == NULL) {
505 		/* Look for ZFS_DEBUG environment variable */
506 		dprintf_string = getenv("ZFS_DEBUG");
507 	}
508 
509 	/*
510 	 * Are we just turning on all debugging?
511 	 */
512 	if (dprintf_find_string("on"))
513 		dprintf_print_all = 1;
514 }
515 
516 /*
517  * =========================================================================
518  * debug printfs
519  * =========================================================================
520  */
521 void
522 __dprintf(const char *file, const char *func, int line, const char *fmt, ...)
523 {
524 	const char *newfile;
525 	va_list adx;
526 
527 	/*
528 	 * Get rid of annoying "../common/" prefix to filename.
529 	 */
530 	newfile = strrchr(file, '/');
531 	if (newfile != NULL) {
532 		newfile = newfile + 1; /* Get rid of leading / */
533 	} else {
534 		newfile = file;
535 	}
536 
537 	if (dprintf_print_all ||
538 	    dprintf_find_string(newfile) ||
539 	    dprintf_find_string(func)) {
540 		/* Print out just the function name if requested */
541 		flockfile(stdout);
542 		if (dprintf_find_string("pid"))
543 			(void) printf("%d ", getpid());
544 		if (dprintf_find_string("tid"))
545 			(void) printf("%u ", thr_self());
546 		if (dprintf_find_string("cpu"))
547 			(void) printf("%u ", getcpuid());
548 		if (dprintf_find_string("time"))
549 			(void) printf("%llu ", gethrtime());
550 		if (dprintf_find_string("long"))
551 			(void) printf("%s, line %d: ", newfile, line);
552 		(void) printf("%s: ", func);
553 		va_start(adx, fmt);
554 		(void) vprintf(fmt, adx);
555 		va_end(adx);
556 		funlockfile(stdout);
557 	}
558 }
559 
560 #endif /* ZFS_DEBUG */
561 
562 /*
563  * =========================================================================
564  * cmn_err() and panic()
565  * =========================================================================
566  */
567 static char ce_prefix[CE_IGNORE][10] = { "", "NOTICE: ", "WARNING: ", "" };
568 static char ce_suffix[CE_IGNORE][2] = { "", "\n", "\n", "" };
569 
570 void
571 vpanic(const char *fmt, va_list adx)
572 {
573 	(void) fprintf(stderr, "error: ");
574 	(void) vfprintf(stderr, fmt, adx);
575 	(void) fprintf(stderr, "\n");
576 
577 	abort();	/* think of it as a "user-level crash dump" */
578 }
579 
580 void
581 panic(const char *fmt, ...)
582 {
583 	va_list adx;
584 
585 	va_start(adx, fmt);
586 	vpanic(fmt, adx);
587 	va_end(adx);
588 }
589 
590 void
591 vcmn_err(int ce, const char *fmt, va_list adx)
592 {
593 	if (ce == CE_PANIC)
594 		vpanic(fmt, adx);
595 	if (ce != CE_NOTE) {	/* suppress noise in userland stress testing */
596 		(void) fprintf(stderr, "%s", ce_prefix[ce]);
597 		(void) vfprintf(stderr, fmt, adx);
598 		(void) fprintf(stderr, "%s", ce_suffix[ce]);
599 	}
600 }
601 
602 /*PRINTFLIKE2*/
603 void
604 cmn_err(int ce, const char *fmt, ...)
605 {
606 	va_list adx;
607 
608 	va_start(adx, fmt);
609 	vcmn_err(ce, fmt, adx);
610 	va_end(adx);
611 }
612 
613 /*
614  * =========================================================================
615  * kobj interfaces
616  * =========================================================================
617  */
618 struct _buf *
619 kobj_open_file(char *name)
620 {
621 	struct _buf *file;
622 	vnode_t *vp;
623 
624 	/* set vp as the _fd field of the file */
625 	if (vn_openat(name, UIO_SYSSPACE, FREAD, 0, &vp, 0, 0, rootdir) != 0)
626 		return ((void *)-1UL);
627 
628 	file = umem_zalloc(sizeof (struct _buf), UMEM_NOFAIL);
629 	file->_fd = (intptr_t)vp;
630 	return (file);
631 }
632 
633 int
634 kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
635 {
636 	ssize_t resid;
637 
638 	vn_rdwr(UIO_READ, (vnode_t *)file->_fd, buf, size, (offset_t)off,
639 	    UIO_SYSSPACE, 0, 0, 0, &resid);
640 
641 	return (size - resid);
642 }
643 
644 void
645 kobj_close_file(struct _buf *file)
646 {
647 	vn_close((vnode_t *)file->_fd);
648 	umem_free(file, sizeof (struct _buf));
649 }
650 
651 int
652 kobj_get_filesize(struct _buf *file, uint64_t *size)
653 {
654 	struct stat64 st;
655 	vnode_t *vp = (vnode_t *)file->_fd;
656 
657 	if (fstat64(vp->v_fd, &st) == -1) {
658 		vn_close(vp);
659 		return (errno);
660 	}
661 	*size = st.st_size;
662 	return (0);
663 }
664 
665 /*
666  * =========================================================================
667  * misc routines
668  * =========================================================================
669  */
670 
671 void
672 delay(clock_t ticks)
673 {
674 	poll(0, 0, ticks * (1000 / hz));
675 }
676 
677 /*
678  * Find highest one bit set.
679  *	Returns bit number + 1 of highest bit that is set, otherwise returns 0.
680  * High order bit is 31 (or 63 in _LP64 kernel).
681  */
682 int
683 highbit(ulong_t i)
684 {
685 	register int h = 1;
686 
687 	if (i == 0)
688 		return (0);
689 #ifdef _LP64
690 	if (i & 0xffffffff00000000ul) {
691 		h += 32; i >>= 32;
692 	}
693 #endif
694 	if (i & 0xffff0000) {
695 		h += 16; i >>= 16;
696 	}
697 	if (i & 0xff00) {
698 		h += 8; i >>= 8;
699 	}
700 	if (i & 0xf0) {
701 		h += 4; i >>= 4;
702 	}
703 	if (i & 0xc) {
704 		h += 2; i >>= 2;
705 	}
706 	if (i & 0x2) {
707 		h += 1;
708 	}
709 	return (h);
710 }
711 
712 static int
713 random_get_bytes_common(uint8_t *ptr, size_t len, char *devname)
714 {
715 	int fd = open(devname, O_RDONLY);
716 	size_t resid = len;
717 	ssize_t bytes;
718 
719 	ASSERT(fd != -1);
720 
721 	while (resid != 0) {
722 		bytes = read(fd, ptr, resid);
723 		ASSERT(bytes >= 0);
724 		ptr += bytes;
725 		resid -= bytes;
726 	}
727 
728 	close(fd);
729 
730 	return (0);
731 }
732 
733 int
734 random_get_bytes(uint8_t *ptr, size_t len)
735 {
736 	return (random_get_bytes_common(ptr, len, "/dev/random"));
737 }
738 
739 int
740 random_get_pseudo_bytes(uint8_t *ptr, size_t len)
741 {
742 	return (random_get_bytes_common(ptr, len, "/dev/urandom"));
743 }
744 
745 int
746 ddi_strtoul(const char *hw_serial, char **nptr, int base, unsigned long *result)
747 {
748 	char *end;
749 
750 	*result = strtoul(hw_serial, &end, base);
751 	if (*result == 0)
752 		return (errno);
753 	return (0);
754 }
755 
756 /*
757  * =========================================================================
758  * kernel emulation setup & teardown
759  * =========================================================================
760  */
761 static int
762 umem_out_of_memory(void)
763 {
764 	char errmsg[] = "out of memory -- generating core dump\n";
765 
766 	write(fileno(stderr), errmsg, sizeof (errmsg));
767 	abort();
768 	return (0);
769 }
770 
771 void
772 kernel_init(int mode)
773 {
774 	umem_nofail_callback(umem_out_of_memory);
775 
776 	physmem = sysconf(_SC_PHYS_PAGES);
777 
778 	dprintf("physmem = %llu pages (%.2f GB)\n", physmem,
779 	    (double)physmem * sysconf(_SC_PAGE_SIZE) / (1ULL << 30));
780 
781 	snprintf(hw_serial, sizeof (hw_serial), "%ld", gethostid());
782 
783 	spa_init(mode);
784 }
785 
786 void
787 kernel_fini(void)
788 {
789 	spa_fini();
790 }
791 
792 int
793 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
794 {
795 	int ret;
796 	uLongf len = *dstlen;
797 
798 	if ((ret = uncompress(dst, &len, src, srclen)) == Z_OK)
799 		*dstlen = (size_t)len;
800 
801 	return (ret);
802 }
803 
804 int
805 z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen,
806     int level)
807 {
808 	int ret;
809 	uLongf len = *dstlen;
810 
811 	if ((ret = compress2(dst, &len, src, srclen, level)) == Z_OK)
812 		*dstlen = (size_t)len;
813 
814 	return (ret);
815 }
816 
817 uid_t
818 crgetuid(cred_t *cr)
819 {
820 	return (0);
821 }
822 
823 gid_t
824 crgetgid(cred_t *cr)
825 {
826 	return (0);
827 }
828 
829 int
830 crgetngroups(cred_t *cr)
831 {
832 	return (0);
833 }
834 
835 gid_t *
836 crgetgroups(cred_t *cr)
837 {
838 	return (NULL);
839 }
840 
841 int
842 zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr)
843 {
844 	return (0);
845 }
846 
847 int
848 zfs_secpolicy_rename_perms(const char *from, const char *to, cred_t *cr)
849 {
850 	return (0);
851 }
852 
853 int
854 zfs_secpolicy_destroy_perms(const char *name, cred_t *cr)
855 {
856 	return (0);
857 }
858