lib/libzpool/kernel.c

   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 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <assert.h>
  27 #include <fcntl.h>
  28 #include <poll.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <zlib.h>
  33 #include <sys/spa.h>
  34 #include <sys/stat.h>
  35 #include <sys/processor.h>
  36 #include <sys/zfs_context.h>
  37 #include <sys/zmod.h>
  38 #include <sys/utsname.h>
  39
  40 /*
  41  * Emulation of kernel services in userland.
  42  */
  43
  44 uint64_t physmem;
  45 vnode_t *rootdir = (vnode_t *)0xabcd1234;
  46 char hw_serial[11];
  47
  48 struct utsname utsname = {
  49         "userland", "libzpool", "1", "1", "na"
  50 };
  51
  52 /*
  53  * =========================================================================
  54  * threads
  55  * =========================================================================
  56  */
  57 /*ARGSUSED*/
  58 kthread_t *
  59 zk_thread_create(void (*func)(), void *arg)
  60 {
  61         thread_t tid;
  62
  63         VERIFY(thr_create(0, 0, (void *(*)(void *))func, arg, THR_DETACHED,
  64             &tid) == 0);
  65
  66         return ((void *)(uintptr_t)tid);
  67 }
  68
  69 /*
  70  * =========================================================================
  71  * kstats
  72  * =========================================================================
  73  */
  74 /*ARGSUSED*/
  75 kstat_t *
  76 kstat_create(char *module, int instance, char *name, char *class,
  77     uchar_t type, ulong_t ndata, uchar_t ks_flag)
  78 {
  79         return (NULL);
  80 }
  81
  82 /*ARGSUSED*/
  83 void
  84 kstat_install(kstat_t *ksp)
  85 {}
  86
  87 /*ARGSUSED*/
  88 void
  89 kstat_delete(kstat_t *ksp)
  90 {}
  91
  92 /*
  93  * =========================================================================
  94  * mutexes
  95  * =========================================================================
  96  */
  97 void
  98 zmutex_init(kmutex_t *mp)
  99 {
 100         mp->m_owner = NULL;
 101         mp->initialized = B_TRUE;
 102         (void) _mutex_init(&mp->m_lock, USYNC_THREAD, NULL);
 103 }
 104
 105 void
 106 zmutex_destroy(kmutex_t *mp)
 107 {
 108         ASSERT(mp->initialized == B_TRUE);
 109         ASSERT(mp->m_owner == NULL);
 110         (void) _mutex_destroy(&(mp)->m_lock);
 111         mp->m_owner = (void *)-1UL;
 112         mp->initialized = B_FALSE;
 113 }
 114
 115 void
 116 mutex_enter(kmutex_t *mp)
 117 {
 118         ASSERT(mp->initialized == B_TRUE);
 119         ASSERT(mp->m_owner != (void *)-1UL);
 120         ASSERT(mp->m_owner != curthread);
 121         VERIFY(mutex_lock(&mp->m_lock) == 0);
 122         ASSERT(mp->m_owner == NULL);
 123         mp->m_owner = curthread;
 124 }
 125
 126 int
 127 mutex_tryenter(kmutex_t *mp)
 128 {
 129         ASSERT(mp->initialized == B_TRUE);
 130         ASSERT(mp->m_owner != (void *)-1UL);
 131         if (0 == mutex_trylock(&mp->m_lock)) {
 132                 ASSERT(mp->m_owner == NULL);
 133                 mp->m_owner = curthread;
 134                 return (1);
 135         } else {
 136                 return (0);
 137         }
 138 }
 139
 140 void
 141 mutex_exit(kmutex_t *mp)
 142 {
 143         ASSERT(mp->initialized == B_TRUE);
 144         ASSERT(mutex_owner(mp) == curthread);
 145         mp->m_owner = NULL;
 146         VERIFY(mutex_unlock(&mp->m_lock) == 0);
 147 }
 148
 149 void *
 150 mutex_owner(kmutex_t *mp)
 151 {
 152         ASSERT(mp->initialized == B_TRUE);
 153         return (mp->m_owner);
 154 }
 155
 156 /*
 157  * =========================================================================
 158  * rwlocks
 159  * =========================================================================
 160  */
 161 /*ARGSUSED*/
 162 void
 163 rw_init(krwlock_t *rwlp, char *name, int type, void *arg)
 164 {
 165         rwlock_init(&rwlp->rw_lock, USYNC_THREAD, NULL);
 166         rwlp->rw_owner = NULL;
 167         rwlp->initialized = B_TRUE;
 168 }
 169
 170 void
 171 rw_destroy(krwlock_t *rwlp)
 172 {
 173         rwlock_destroy(&rwlp->rw_lock);
 174         rwlp->rw_owner = (void *)-1UL;
 175         rwlp->initialized = B_FALSE;
 176 }
 177
 178 void
 179 rw_enter(krwlock_t *rwlp, krw_t rw)
 180 {
 181         ASSERT(!RW_LOCK_HELD(rwlp));
 182         ASSERT(rwlp->initialized == B_TRUE);
 183         ASSERT(rwlp->rw_owner != (void *)-1UL);
 184         ASSERT(rwlp->rw_owner != curthread);
 185
 186         if (rw == RW_READER)
 187                 VERIFY(rw_rdlock(&rwlp->rw_lock) == 0);
 188         else
 189                 VERIFY(rw_wrlock(&rwlp->rw_lock) == 0);
 190
 191         rwlp->rw_owner = curthread;
 192 }
 193
 194 void
 195 rw_exit(krwlock_t *rwlp)
 196 {
 197         ASSERT(rwlp->initialized == B_TRUE);
 198         ASSERT(rwlp->rw_owner != (void *)-1UL);
 199
 200         rwlp->rw_owner = NULL;
 201         VERIFY(rw_unlock(&rwlp->rw_lock) == 0);
 202 }
 203
 204 int
 205 rw_tryenter(krwlock_t *rwlp, krw_t rw)
 206 {
 207         int rv;
 208
 209         ASSERT(rwlp->initialized == B_TRUE);
 210         ASSERT(rwlp->rw_owner != (void *)-1UL);
 211
 212         if (rw == RW_READER)
 213                 rv = rw_tryrdlock(&rwlp->rw_lock);
 214         else
 215                 rv = rw_trywrlock(&rwlp->rw_lock);
 216
 217         if (rv == 0) {
 218                 rwlp->rw_owner = curthread;
 219                 return (1);
 220         }
 221
 222         return (0);
 223 }
 224
 225 /*ARGSUSED*/
 226 int
 227 rw_tryupgrade(krwlock_t *rwlp)
 228 {
 229         ASSERT(rwlp->initialized == B_TRUE);
 230         ASSERT(rwlp->rw_owner != (void *)-1UL);
 231
 232         return (0);
 233 }
 234
 235 /*
 236  * =========================================================================
 237  * condition variables
 238  * =========================================================================
 239  */
 240 /*ARGSUSED*/
 241 void
 242 cv_init(kcondvar_t *cv, char *name, int type, void *arg)
 243 {
 244         VERIFY(cond_init(cv, type, NULL) == 0);
 245 }
 246
 247 void
 248 cv_destroy(kcondvar_t *cv)
 249 {
 250         VERIFY(cond_destroy(cv) == 0);
 251 }
 252
 253 void
 254 cv_wait(kcondvar_t *cv, kmutex_t *mp)
 255 {
 256         ASSERT(mutex_owner(mp) == curthread);
 257         mp->m_owner = NULL;
 258         int ret = cond_wait(cv, &mp->m_lock);
 259         VERIFY(ret == 0 || ret == EINTR);
 260         mp->m_owner = curthread;
 261 }
 262
 263 clock_t
 264 cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime)
 265 {
 266         int error;
 267         timestruc_t ts;
 268         clock_t delta;
 269
 270 top:
 271         delta = abstime - lbolt;
 272         if (delta <= 0)
 273                 return (-1);
 274
 275         ts.tv_sec = delta / hz;
 276         ts.tv_nsec = (delta % hz) * (NANOSEC / hz);
 277
 278         ASSERT(mutex_owner(mp) == curthread);
 279         mp->m_owner = NULL;
 280         error = cond_reltimedwait(cv, &mp->m_lock, &ts);
 281         mp->m_owner = curthread;
 282
 283         if (error == ETIME)
 284                 return (-1);
 285
 286         if (error == EINTR)
 287                 goto top;
 288
 289         ASSERT(error == 0);
 290
 291         return (1);
 292 }
 293
 294 void
 295 cv_signal(kcondvar_t *cv)
 296 {
 297         VERIFY(cond_signal(cv) == 0);
 298 }
 299
 300 void
 301 cv_broadcast(kcondvar_t *cv)
 302 {
 303         VERIFY(cond_broadcast(cv) == 0);
 304 }
 305
 306 /*
 307  * =========================================================================
 308  * vnode operations
 309  * =========================================================================
 310  */
 311 /*
 312  * Note: for the xxxat() versions of these functions, we assume that the
 313  * starting vp is always rootdir (which is true for spa_directory.c, the only
 314  * ZFS consumer of these interfaces).  We assert this is true, and then emulate
 315  * them by adding '/' in front of the path.
 316  */
 317
 318 /*ARGSUSED*/
 319 int
 320 vn_open(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2, int x3)
 321 {
 322         int fd;
 323         vnode_t *vp;
 324         int old_umask;
 325         char realpath[MAXPATHLEN];
 326         struct stat64 st;
 327
 328         /*
 329          * If we're accessing a real disk from userland, we need to use
 330          * the character interface to avoid caching.  This is particularly
 331          * important if we're trying to look at a real in-kernel storage
 332          * pool from userland, e.g. via zdb, because otherwise we won't
 333          * see the changes occurring under the segmap cache.
 334          * On the other hand, the stupid character device returns zero
 335          * for its size.  So -- gag -- we open the block device to get
 336          * its size, and remember it for subsequent VOP_GETATTR().
 337          */
 338         if (strncmp(path, "/dev/", 5) == 0) {
 339                 char *dsk;
 340                 fd = open64(path, O_RDONLY);
 341                 if (fd == -1)
 342                         return (errno);
 343                 if (fstat64(fd, &st) == -1) {
 344                         close(fd);
 345                         return (errno);
 346                 }
 347                 close(fd);
 348                 (void) sprintf(realpath, "%s", path);
 349                 dsk = strstr(path, "/dsk/");
 350                 if (dsk != NULL)
 351                         (void) sprintf(realpath + (dsk - path) + 1, "r%s",
 352                             dsk + 1);
 353         } else {
 354                 (void) sprintf(realpath, "%s", path);
 355                 if (!(flags & FCREAT) && stat64(realpath, &st) == -1)
 356                         return (errno);
 357         }
 358
 359         if (flags & FCREAT)
 360                 old_umask = umask(0);
 361
 362         /*
 363          * The construct 'flags - FREAD' conveniently maps combinations of
 364          * FREAD and FWRITE to the corresponding O_RDONLY, O_WRONLY, and O_RDWR.
 365          */
 366         fd = open64(realpath, flags - FREAD, mode);
 367
 368         if (flags & FCREAT)
 369                 (void) umask(old_umask);
 370
 371         if (fd == -1)
 372                 return (errno);
 373
 374         if (fstat64(fd, &st) == -1) {
 375                 close(fd);
 376                 return (errno);
 377         }
 378
 379         (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
 380
 381         *vpp = vp = umem_zalloc(sizeof (vnode_t), UMEM_NOFAIL);
 382
 383         vp->v_fd = fd;
 384         vp->v_size = st.st_size;
 385         vp->v_path = spa_strdup(path);
 386
 387         return (0);
 388 }
 389
 390 /*ARGSUSED*/
 391 int
 392 vn_openat(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2,
 393     int x3, vnode_t *startvp, int fd)
 394 {
 395         char *realpath = umem_alloc(strlen(path) + 2, UMEM_NOFAIL);
 396         int ret;
 397
 398         ASSERT(startvp == rootdir);
 399         (void) sprintf(realpath, "/%s", path);
 400
 401         /* fd ignored for now, need if want to simulate nbmand support */
 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,
 626             -1) != 0)
 627                 return ((void *)-1UL);
 628
 629         file = umem_zalloc(sizeof (struct _buf), UMEM_NOFAIL);
 630         file->_fd = (intptr_t)vp;
 631         return (file);
 632 }
 633
 634 int
 635 kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
 636 {
 637         ssize_t resid;
 638
 639         vn_rdwr(UIO_READ, (vnode_t *)file->_fd, buf, size, (offset_t)off,
 640             UIO_SYSSPACE, 0, 0, 0, &resid);
 641
 642         return (size - resid);
 643 }
 644
 645 void
 646 kobj_close_file(struct _buf *file)
 647 {
 648         vn_close((vnode_t *)file->_fd);
 649         umem_free(file, sizeof (struct _buf));
 650 }
 651
 652 int
 653 kobj_get_filesize(struct _buf *file, uint64_t *size)
 654 {
 655         struct stat64 st;
 656         vnode_t *vp = (vnode_t *)file->_fd;
 657
 658         if (fstat64(vp->v_fd, &st) == -1) {
 659                 vn_close(vp);
 660                 return (errno);
 661         }
 662         *size = st.st_size;
 663         return (0);
 664 }
 665
 666 /*
 667  * =========================================================================
 668  * misc routines
 669  * =========================================================================
 670  */
 671
 672 void
 673 delay(clock_t ticks)
 674 {
 675         poll(0, 0, ticks * (1000 / hz));
 676 }
 677
 678 /*
 679  * Find highest one bit set.
 680  *      Returns bit number + 1 of highest bit that is set, otherwise returns 0.
 681  * High order bit is 31 (or 63 in _LP64 kernel).
 682  */
 683 int
 684 highbit(ulong_t i)
 685 {
 686         register int h = 1;
 687
 688         if (i == 0)
 689                 return (0);
 690 #ifdef _LP64
 691         if (i & 0xffffffff00000000ul) {
 692                 h += 32; i >>= 32;
 693         }
 694 #endif
 695         if (i & 0xffff0000) {
 696                 h += 16; i >>= 16;
 697         }
 698         if (i & 0xff00) {
 699                 h += 8; i >>= 8;
 700         }
 701         if (i & 0xf0) {
 702                 h += 4; i >>= 4;
 703         }
 704         if (i & 0xc) {
 705                 h += 2; i >>= 2;
 706         }
 707         if (i & 0x2) {
 708                 h += 1;
 709         }
 710         return (h);
 711 }
 712
 713 static int random_fd = -1, urandom_fd = -1;
 714
 715 static int
 716 random_get_bytes_common(uint8_t *ptr, size_t len, int fd)
 717 {
 718         size_t resid = len;
 719         ssize_t bytes;
 720
 721         ASSERT(fd != -1);
 722
 723         while (resid != 0) {
 724                 bytes = read(fd, ptr, resid);
 725                 ASSERT3S(bytes, >=, 0);
 726                 ptr += bytes;
 727                 resid -= bytes;
 728         }
 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, random_fd));
 737 }
 738
 739 int
 740 random_get_pseudo_bytes(uint8_t *ptr, size_t len)
 741 {
 742         return (random_get_bytes_common(ptr, len, urandom_fd));
 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         VERIFY((random_fd = open("/dev/random", O_RDONLY)) != -1);
 784         VERIFY((urandom_fd = open("/dev/urandom", O_RDONLY)) != -1);
 785
 786         system_taskq_init();
 787
 788         spa_init(mode);
 789 }
 790
 791 void
 792 kernel_fini(void)
 793 {
 794         spa_fini();
 795
 796         close(random_fd);
 797         close(urandom_fd);
 798
 799         random_fd = -1;
 800         urandom_fd = -1;
 801 }
 802
 803 int
 804 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
 805 {
 806         int ret;
 807         uLongf len = *dstlen;
 808
 809         if ((ret = uncompress(dst, &len, src, srclen)) == Z_OK)
 810                 *dstlen = (size_t)len;
 811
 812         return (ret);
 813 }
 814
 815 int
 816 z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen,
 817     int level)
 818 {
 819         int ret;
 820         uLongf len = *dstlen;
 821
 822         if ((ret = compress2(dst, &len, src, srclen, level)) == Z_OK)
 823                 *dstlen = (size_t)len;
 824
 825         return (ret);
 826 }
 827
 828 uid_t
 829 crgetuid(cred_t *cr)
 830 {
 831         return (0);
 832 }
 833
 834 gid_t
 835 crgetgid(cred_t *cr)
 836 {
 837         return (0);
 838 }
 839
 840 int
 841 crgetngroups(cred_t *cr)
 842 {
 843         return (0);
 844 }
 845
 846 gid_t *
 847 crgetgroups(cred_t *cr)
 848 {
 849         return (NULL);
 850 }
 851
 852 int
 853 zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr)
 854 {
 855         return (0);
 856 }
 857
 858 int
 859 zfs_secpolicy_rename_perms(const char *from, const char *to, cred_t *cr)
 860 {
 861         return (0);
 862 }
 863
 864 int
 865 zfs_secpolicy_destroy_perms(const char *name, cred_t *cr)
 866 {
 867         return (0);
 868 }
 869
 870 ksiddomain_t *
 871 ksid_lookupdomain(const char *dom)
 872 {
 873         ksiddomain_t *kd;
 874
 875         kd = umem_zalloc(sizeof (ksiddomain_t), UMEM_NOFAIL);
 876         kd->kd_name = spa_strdup(dom);
 877         return (kd);
 878 }
 879
 880 void
 881 ksiddomain_rele(ksiddomain_t *ksid)
 882 {
 883         spa_strfree(ksid->kd_name);
 884         umem_free(ksid, sizeof (ksiddomain_t));
 885 }