zfs/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
  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 /*ARGSUSED*/
 393 int
 394 vn_openat(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2,
 395     int x3, vnode_t *startvp, int fd)
 396 {
 397         char *realpath = umem_alloc(strlen(path) + 2, UMEM_NOFAIL);
 398         int ret;
 399
 400         ASSERT(startvp == rootdir);
 401         (void) sprintf(realpath, "/%s", path);
 402
 403         /* fd ignored for now, need if want to simulate nbmand support */
 404         ret = vn_open(realpath, x1, flags, mode, vpp, x2, x3);
 405
 406         umem_free(realpath, strlen(path) + 2);
 407
 408         return (ret);
 409 }
 410
 411 /*ARGSUSED*/
 412 int
 413 vn_rdwr(int uio, vnode_t *vp, void *addr, ssize_t len, offset_t offset,
 414         int x1, int x2, rlim64_t x3, void *x4, ssize_t *residp)
 415 {
 416         ssize_t iolen, split;
 417
 418         if (uio == UIO_READ) {
 419                 iolen = pread64(vp->v_fd, addr, len, offset);
 420         } else {
 421                 /*
 422                  * To simulate partial disk writes, we split writes into two
 423                  * system calls so that the process can be killed in between.
 424                  */
 425                 split = (len > 0 ? rand() % len : 0);
 426                 iolen = pwrite64(vp->v_fd, addr, split, offset);
 427                 iolen += pwrite64(vp->v_fd, (char *)addr + split,
 428                     len - split, offset + split);
 429         }
 430
 431         if (iolen < 0)
 432                 return (errno);
 433         if (residp)
 434                 *residp = len - iolen;
 435         else if (iolen != len)
 436                 return (EIO);
 437         return (0);
 438 }
 439
 440 void
 441 vn_close(vnode_t *vp)
 442 {
 443         close(vp->v_fd);
 444         spa_strfree(vp->v_path);
 445         umem_free(vp, sizeof (vnode_t));
 446 }
 447
 448 #ifdef ZFS_DEBUG
 449
 450 /*
 451  * =========================================================================
 452  * Figure out which debugging statements to print
 453  * =========================================================================
 454  */
 455
 456 static char *dprintf_string;
 457 static int dprintf_print_all;
 458
 459 int
 460 dprintf_find_string(const char *string)
 461 {
 462         char *tmp_str = dprintf_string;
 463         int len = strlen(string);
 464
 465         /*
 466          * Find out if this is a string we want to print.
 467          * String format: file1.c,function_name1,file2.c,file3.c
 468          */
 469
 470         while (tmp_str != NULL) {
 471                 if (strncmp(tmp_str, string, len) == 0 &&
 472                     (tmp_str[len] == ',' || tmp_str[len] == '\0'))
 473                         return (1);
 474                 tmp_str = strchr(tmp_str, ',');
 475                 if (tmp_str != NULL)
 476                         tmp_str++; /* Get rid of , */
 477         }
 478         return (0);
 479 }
 480
 481 void
 482 dprintf_setup(int *argc, char **argv)
 483 {
 484         int i, j;
 485
 486         /*
 487          * Debugging can be specified two ways: by setting the
 488          * environment variable ZFS_DEBUG, or by including a
 489          * "debug=..."  argument on the command line.  The command
 490          * line setting overrides the environment variable.
 491          */
 492
 493         for (i = 1; i < *argc; i++) {
 494                 int len = strlen("debug=");
 495                 /* First look for a command line argument */
 496                 if (strncmp("debug=", argv[i], len) == 0) {
 497                         dprintf_string = argv[i] + len;
 498                         /* Remove from args */
 499                         for (j = i; j < *argc; j++)
 500                                 argv[j] = argv[j+1];
 501                         argv[j] = NULL;
 502                         (*argc)--;
 503                 }
 504         }
 505
 506         if (dprintf_string == NULL) {
 507                 /* Look for ZFS_DEBUG environment variable */
 508                 dprintf_string = getenv("ZFS_DEBUG");
 509         }
 510
 511         /*
 512          * Are we just turning on all debugging?
 513          */
 514         if (dprintf_find_string("on"))
 515                 dprintf_print_all = 1;
 516 }
 517
 518 /*
 519  * =========================================================================
 520  * debug printfs
 521  * =========================================================================
 522  */
 523 void
 524 __dprintf(const char *file, const char *func, int line, const char *fmt, ...)
 525 {
 526         const char *newfile;
 527         va_list adx;
 528
 529         /*
 530          * Get rid of annoying "../common/" prefix to filename.
 531          */
 532         newfile = strrchr(file, '/');
 533         if (newfile != NULL) {
 534                 newfile = newfile + 1; /* Get rid of leading / */
 535         } else {
 536                 newfile = file;
 537         }
 538
 539         if (dprintf_print_all ||
 540             dprintf_find_string(newfile) ||
 541             dprintf_find_string(func)) {
 542                 /* Print out just the function name if requested */
 543                 flockfile(stdout);
 544                 if (dprintf_find_string("pid"))
 545                         (void) printf("%d ", getpid());
 546                 if (dprintf_find_string("tid"))
 547                         (void) printf("%u ", thr_self());
 548                 if (dprintf_find_string("cpu"))
 549                         (void) printf("%u ", getcpuid());
 550                 if (dprintf_find_string("time"))
 551                         (void) printf("%llu ", gethrtime());
 552                 if (dprintf_find_string("long"))
 553                         (void) printf("%s, line %d: ", newfile, line);
 554                 (void) printf("%s: ", func);
 555                 va_start(adx, fmt);
 556                 (void) vprintf(fmt, adx);
 557                 va_end(adx);
 558                 funlockfile(stdout);
 559         }
 560 }
 561
 562 #endif /* ZFS_DEBUG */
 563
 564 /*
 565  * =========================================================================
 566  * cmn_err() and panic()
 567  * =========================================================================
 568  */
 569 static char ce_prefix[CE_IGNORE][10] = { "", "NOTICE: ", "WARNING: ", "" };
 570 static char ce_suffix[CE_IGNORE][2] = { "", "\n", "\n", "" };
 571
 572 void
 573 vpanic(const char *fmt, va_list adx)
 574 {
 575         (void) fprintf(stderr, "error: ");
 576         (void) vfprintf(stderr, fmt, adx);
 577         (void) fprintf(stderr, "\n");
 578
 579         abort();        /* think of it as a "user-level crash dump" */
 580 }
 581
 582 void
 583 panic(const char *fmt, ...)
 584 {
 585         va_list adx;
 586
 587         va_start(adx, fmt);
 588         vpanic(fmt, adx);
 589         va_end(adx);
 590 }
 591
 592 void
 593 vcmn_err(int ce, const char *fmt, va_list adx)
 594 {
 595         if (ce == CE_PANIC)
 596                 vpanic(fmt, adx);
 597         if (ce != CE_NOTE) {    /* suppress noise in userland stress testing */
 598                 (void) fprintf(stderr, "%s", ce_prefix[ce]);
 599                 (void) vfprintf(stderr, fmt, adx);
 600                 (void) fprintf(stderr, "%s", ce_suffix[ce]);
 601         }
 602 }
 603
 604 /*PRINTFLIKE2*/
 605 void
 606 cmn_err(int ce, const char *fmt, ...)
 607 {
 608         va_list adx;
 609
 610         va_start(adx, fmt);
 611         vcmn_err(ce, fmt, adx);
 612         va_end(adx);
 613 }
 614
 615 /*
 616  * =========================================================================
 617  * kobj interfaces
 618  * =========================================================================
 619  */
 620 struct _buf *
 621 kobj_open_file(char *name)
 622 {
 623         struct _buf *file;
 624         vnode_t *vp;
 625
 626         /* set vp as the _fd field of the file */
 627         if (vn_openat(name, UIO_SYSSPACE, FREAD, 0, &vp, 0, 0, rootdir,
 628             -1) != 0)
 629                 return ((void *)-1UL);
 630
 631         file = umem_zalloc(sizeof (struct _buf), UMEM_NOFAIL);
 632         file->_fd = (intptr_t)vp;
 633         return (file);
 634 }
 635
 636 int
 637 kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
 638 {
 639         ssize_t resid;
 640
 641         vn_rdwr(UIO_READ, (vnode_t *)file->_fd, buf, size, (offset_t)off,
 642             UIO_SYSSPACE, 0, 0, 0, &resid);
 643
 644         return (size - resid);
 645 }
 646
 647 void
 648 kobj_close_file(struct _buf *file)
 649 {
 650         vn_close((vnode_t *)file->_fd);
 651         umem_free(file, sizeof (struct _buf));
 652 }
 653
 654 int
 655 kobj_get_filesize(struct _buf *file, uint64_t *size)
 656 {
 657         struct stat64 st;
 658         vnode_t *vp = (vnode_t *)file->_fd;
 659
 660         if (fstat64(vp->v_fd, &st) == -1) {
 661                 vn_close(vp);
 662                 return (errno);
 663         }
 664         *size = st.st_size;
 665         return (0);
 666 }
 667
 668 /*
 669  * =========================================================================
 670  * misc routines
 671  * =========================================================================
 672  */
 673
 674 void
 675 delay(clock_t ticks)
 676 {
 677         poll(0, 0, ticks * (1000 / hz));
 678 }
 679
 680 /*
 681  * Find highest one bit set.
 682  *      Returns bit number + 1 of highest bit that is set, otherwise returns 0.
 683  * High order bit is 31 (or 63 in _LP64 kernel).
 684  */
 685 int
 686 highbit(ulong_t i)
 687 {
 688         register int h = 1;
 689
 690         if (i == 0)
 691                 return (0);
 692 #ifdef _LP64
 693         if (i & 0xffffffff00000000ul) {
 694                 h += 32; i >>= 32;
 695         }
 696 #endif
 697         if (i & 0xffff0000) {
 698                 h += 16; i >>= 16;
 699         }
 700         if (i & 0xff00) {
 701                 h += 8; i >>= 8;
 702         }
 703         if (i & 0xf0) {
 704                 h += 4; i >>= 4;
 705         }
 706         if (i & 0xc) {
 707                 h += 2; i >>= 2;
 708         }
 709         if (i & 0x2) {
 710                 h += 1;
 711         }
 712         return (h);
 713 }
 714
 715 static int random_fd = -1, urandom_fd = -1;
 716
 717 static int
 718 random_get_bytes_common(uint8_t *ptr, size_t len, int fd)
 719 {
 720         size_t resid = len;
 721         ssize_t bytes;
 722
 723         ASSERT(fd != -1);
 724
 725         while (resid != 0) {
 726                 bytes = read(fd, ptr, resid);
 727                 ASSERT3S(bytes, >=, 0);
 728                 ptr += bytes;
 729                 resid -= bytes;
 730         }
 731
 732         return (0);
 733 }
 734
 735 int
 736 random_get_bytes(uint8_t *ptr, size_t len)
 737 {
 738         return (random_get_bytes_common(ptr, len, random_fd));
 739 }
 740
 741 int
 742 random_get_pseudo_bytes(uint8_t *ptr, size_t len)
 743 {
 744         return (random_get_bytes_common(ptr, len, urandom_fd));
 745 }
 746
 747 int
 748 ddi_strtoul(const char *hw_serial, char **nptr, int base, unsigned long *result)
 749 {
 750         char *end;
 751
 752         *result = strtoul(hw_serial, &end, base);
 753         if (*result == 0)
 754                 return (errno);
 755         return (0);
 756 }
 757
 758 /*
 759  * =========================================================================
 760  * kernel emulation setup & teardown
 761  * =========================================================================
 762  */
 763 static int
 764 umem_out_of_memory(void)
 765 {
 766         char errmsg[] = "out of memory -- generating core dump\n";
 767
 768         write(fileno(stderr), errmsg, sizeof (errmsg));
 769         abort();
 770         return (0);
 771 }
 772
 773 void
 774 kernel_init(int mode)
 775 {
 776         umem_nofail_callback(umem_out_of_memory);
 777
 778         physmem = sysconf(_SC_PHYS_PAGES);
 779
 780         dprintf("physmem = %llu pages (%.2f GB)\n", physmem,
 781             (double)physmem * sysconf(_SC_PAGE_SIZE) / (1ULL << 30));
 782
 783         uname(&utsname);
 784         snprintf(hw_serial, sizeof (hw_serial), "%ld", gethostid());
 785
 786         VERIFY((random_fd = open("/dev/random", O_RDONLY)) != -1);
 787         VERIFY((urandom_fd = open("/dev/urandom", O_RDONLY)) != -1);
 788
 789         spa_init(mode);
 790 }
 791
 792 void
 793 kernel_fini(void)
 794 {
 795         spa_fini();
 796
 797         close(random_fd);
 798         close(urandom_fd);
 799
 800         random_fd = -1;
 801         urandom_fd = -1;
 802 }
 803
 804 int
 805 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
 806 {
 807         int ret;
 808         uLongf len = *dstlen;
 809
 810         if ((ret = uncompress(dst, &len, src, srclen)) == Z_OK)
 811                 *dstlen = (size_t)len;
 812
 813         return (ret);
 814 }
 815
 816 int
 817 z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen,
 818     int level)
 819 {
 820         int ret;
 821         uLongf len = *dstlen;
 822
 823         if ((ret = compress2(dst, &len, src, srclen, level)) == Z_OK)
 824                 *dstlen = (size_t)len;
 825
 826         return (ret);
 827 }
 828
 829 /*ARGSUSED*/
 830 size_t u8_textprep_str(char *i, size_t *il, char *o, size_t *ol, int nf,
 831     size_t vers, int *err)
 832 {
 833         *err = EINVAL;
 834         return ((size_t)-1);
 835 }
 836
 837 uid_t
 838 crgetuid(cred_t *cr)
 839 {
 840         return (0);
 841 }
 842
 843 gid_t
 844 crgetgid(cred_t *cr)
 845 {
 846         return (0);
 847 }
 848
 849 int
 850 crgetngroups(cred_t *cr)
 851 {
 852         return (0);
 853 }
 854
 855 gid_t *
 856 crgetgroups(cred_t *cr)
 857 {
 858         return (NULL);
 859 }
 860
 861 int
 862 zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr)
 863 {
 864         return (0);
 865 }
 866
 867 int
 868 zfs_secpolicy_rename_perms(const char *from, const char *to, cred_t *cr)
 869 {
 870         return (0);
 871 }
 872
 873 int
 874 zfs_secpolicy_destroy_perms(const char *name, cred_t *cr)
 875 {
 876         return (0);
 877 }
 878
 879 ksiddomain_t *
 880 ksid_lookupdomain(const char *dom)
 881 {
 882         ksiddomain_t *kd;
 883
 884         kd = umem_zalloc(sizeof (ksiddomain_t), UMEM_NOFAIL);
 885         kd->kd_name = spa_strdup(dom);
 886         return (kd);
 887 }
 888
 889 void
 890 ksiddomain_rele(ksiddomain_t *ksid)
 891 {
 892         spa_strfree(ksid->kd_name);
 893         umem_free(ksid, sizeof (ksiddomain_t));
 894 }