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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #include <assert.h>
  26 #include <fcntl.h>
  27 #include <poll.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <zlib.h>
  32 #include <sys/spa.h>
  33 #include <sys/stat.h>
  34 #include <sys/processor.h>
  35 #include <sys/zfs_context.h>
  36 #include <sys/zmod.h>
  37 #include <sys/utsname.h>
  38 #include <sys/systeminfo.h>
  39
  40 /*
  41  * Emulation of kernel services in userland.
  42  */
  43
  44 int aok;
  45 uint64_t physmem;
  46 vnode_t *rootdir = (vnode_t *)0xabcd1234;
  47 char hw_serial[HW_HOSTID_LEN];
  48
  49 struct utsname utsname = {
  50         "userland", "libzpool", "1", "1", "na"
  51 };
  52
  53 /* this only exists to have its address taken */
  54 struct proc p0;
  55
  56 /*
  57  * =========================================================================
  58  * threads
  59  * =========================================================================
  60  */
  61 /*ARGSUSED*/
  62 kthread_t *
  63 zk_thread_create(void (*func)(), void *arg)
  64 {
  65         thread_t tid;
  66
  67         VERIFY(thr_create(0, 0, (void *(*)(void *))func, arg, THR_DETACHED,
  68             &tid) == 0);
  69
  70         return ((void *)(uintptr_t)tid);
  71 }
  72
  73 /*
  74  * =========================================================================
  75  * kstats
  76  * =========================================================================
  77  */
  78 /*ARGSUSED*/
  79 kstat_t *
  80 kstat_create(char *module, int instance, char *name, char *class,
  81     uchar_t type, ulong_t ndata, uchar_t ks_flag)
  82 {
  83         return (NULL);
  84 }
  85
  86 /*ARGSUSED*/
  87 void
  88 kstat_install(kstat_t *ksp)
  89 {}
  90
  91 /*ARGSUSED*/
  92 void
  93 kstat_delete(kstat_t *ksp)
  94 {}
  95
  96 /*
  97  * =========================================================================
  98  * mutexes
  99  * =========================================================================
 100  */
 101 void
 102 zmutex_init(kmutex_t *mp)
 103 {
 104         mp->m_owner = NULL;
 105         mp->initialized = B_TRUE;
 106         (void) _mutex_init(&mp->m_lock, USYNC_THREAD, NULL);
 107 }
 108
 109 void
 110 zmutex_destroy(kmutex_t *mp)
 111 {
 112         ASSERT(mp->initialized == B_TRUE);
 113         ASSERT(mp->m_owner == NULL);
 114         (void) _mutex_destroy(&(mp)->m_lock);
 115         mp->m_owner = (void *)-1UL;
 116         mp->initialized = B_FALSE;
 117 }
 118
 119 void
 120 mutex_enter(kmutex_t *mp)
 121 {
 122         ASSERT(mp->initialized == B_TRUE);
 123         ASSERT(mp->m_owner != (void *)-1UL);
 124         ASSERT(mp->m_owner != curthread);
 125         VERIFY(mutex_lock(&mp->m_lock) == 0);
 126         ASSERT(mp->m_owner == NULL);
 127         mp->m_owner = curthread;
 128 }
 129
 130 int
 131 mutex_tryenter(kmutex_t *mp)
 132 {
 133         ASSERT(mp->initialized == B_TRUE);
 134         ASSERT(mp->m_owner != (void *)-1UL);
 135         if (0 == mutex_trylock(&mp->m_lock)) {
 136                 ASSERT(mp->m_owner == NULL);
 137                 mp->m_owner = curthread;
 138                 return (1);
 139         } else {
 140                 return (0);
 141         }
 142 }
 143
 144 void
 145 mutex_exit(kmutex_t *mp)
 146 {
 147         ASSERT(mp->initialized == B_TRUE);
 148         ASSERT(mutex_owner(mp) == curthread);
 149         mp->m_owner = NULL;
 150         VERIFY(mutex_unlock(&mp->m_lock) == 0);
 151 }
 152
 153 void *
 154 mutex_owner(kmutex_t *mp)
 155 {
 156         ASSERT(mp->initialized == B_TRUE);
 157         return (mp->m_owner);
 158 }
 159
 160 /*
 161  * =========================================================================
 162  * rwlocks
 163  * =========================================================================
 164  */
 165 /*ARGSUSED*/
 166 void
 167 rw_init(krwlock_t *rwlp, char *name, int type, void *arg)
 168 {
 169         rwlock_init(&rwlp->rw_lock, USYNC_THREAD, NULL);
 170         rwlp->rw_owner = NULL;
 171         rwlp->initialized = B_TRUE;
 172 }
 173
 174 void
 175 rw_destroy(krwlock_t *rwlp)
 176 {
 177         rwlock_destroy(&rwlp->rw_lock);
 178         rwlp->rw_owner = (void *)-1UL;
 179         rwlp->initialized = B_FALSE;
 180 }
 181
 182 void
 183 rw_enter(krwlock_t *rwlp, krw_t rw)
 184 {
 185         ASSERT(!RW_LOCK_HELD(rwlp));
 186         ASSERT(rwlp->initialized == B_TRUE);
 187         ASSERT(rwlp->rw_owner != (void *)-1UL);
 188         ASSERT(rwlp->rw_owner != curthread);
 189
 190         if (rw == RW_READER)
 191                 VERIFY(rw_rdlock(&rwlp->rw_lock) == 0);
 192         else
 193                 VERIFY(rw_wrlock(&rwlp->rw_lock) == 0);
 194
 195         rwlp->rw_owner = curthread;
 196 }
 197
 198 void
 199 rw_exit(krwlock_t *rwlp)
 200 {
 201         ASSERT(rwlp->initialized == B_TRUE);
 202         ASSERT(rwlp->rw_owner != (void *)-1UL);
 203
 204         rwlp->rw_owner = NULL;
 205         VERIFY(rw_unlock(&rwlp->rw_lock) == 0);
 206 }
 207
 208 int
 209 rw_tryenter(krwlock_t *rwlp, krw_t rw)
 210 {
 211         int rv;
 212
 213         ASSERT(rwlp->initialized == B_TRUE);
 214         ASSERT(rwlp->rw_owner != (void *)-1UL);
 215
 216         if (rw == RW_READER)
 217                 rv = rw_tryrdlock(&rwlp->rw_lock);
 218         else
 219                 rv = rw_trywrlock(&rwlp->rw_lock);
 220
 221         if (rv == 0) {
 222                 rwlp->rw_owner = curthread;
 223                 return (1);
 224         }
 225
 226         return (0);
 227 }
 228
 229 /*ARGSUSED*/
 230 int
 231 rw_tryupgrade(krwlock_t *rwlp)
 232 {
 233         ASSERT(rwlp->initialized == B_TRUE);
 234         ASSERT(rwlp->rw_owner != (void *)-1UL);
 235
 236         return (0);
 237 }
 238
 239 /*
 240  * =========================================================================
 241  * condition variables
 242  * =========================================================================
 243  */
 244 /*ARGSUSED*/
 245 void
 246 cv_init(kcondvar_t *cv, char *name, int type, void *arg)
 247 {
 248         VERIFY(cond_init(cv, type, NULL) == 0);
 249 }
 250
 251 void
 252 cv_destroy(kcondvar_t *cv)
 253 {
 254         VERIFY(cond_destroy(cv) == 0);
 255 }
 256
 257 void
 258 cv_wait(kcondvar_t *cv, kmutex_t *mp)
 259 {
 260         ASSERT(mutex_owner(mp) == curthread);
 261         mp->m_owner = NULL;
 262         int ret = cond_wait(cv, &mp->m_lock);
 263         VERIFY(ret == 0 || ret == EINTR);
 264         mp->m_owner = curthread;
 265 }
 266
 267 clock_t
 268 cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime)
 269 {
 270         int error;
 271         timestruc_t ts;
 272         clock_t delta;
 273
 274 top:
 275         delta = abstime - ddi_get_lbolt();
 276         if (delta <= 0)
 277                 return (-1);
 278
 279         ts.tv_sec = delta / hz;
 280         ts.tv_nsec = (delta % hz) * (NANOSEC / hz);
 281
 282         ASSERT(mutex_owner(mp) == curthread);
 283         mp->m_owner = NULL;
 284         error = cond_reltimedwait(cv, &mp->m_lock, &ts);
 285         mp->m_owner = curthread;
 286
 287         if (error == ETIME)
 288                 return (-1);
 289
 290         if (error == EINTR)
 291                 goto top;
 292
 293         ASSERT(error == 0);
 294
 295         return (1);
 296 }
 297
 298 void
 299 cv_signal(kcondvar_t *cv)
 300 {
 301         VERIFY(cond_signal(cv) == 0);
 302 }
 303
 304 void
 305 cv_broadcast(kcondvar_t *cv)
 306 {
 307         VERIFY(cond_broadcast(cv) == 0);
 308 }
 309
 310 /*
 311  * =========================================================================
 312  * vnode operations
 313  * =========================================================================
 314  */
 315 /*
 316  * Note: for the xxxat() versions of these functions, we assume that the
 317  * starting vp is always rootdir (which is true for spa_directory.c, the only
 318  * ZFS consumer of these interfaces).  We assert this is true, and then emulate
 319  * them by adding '/' in front of the path.
 320  */
 321
 322 /*ARGSUSED*/
 323 int
 324 vn_open(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2, int x3)
 325 {
 326         int fd;
 327         vnode_t *vp;
 328         int old_umask;
 329         char realpath[MAXPATHLEN];
 330         struct stat64 st;
 331         int err;
 332
 333         /*
 334          * If we're accessing a real disk from userland, we need to use
 335          * the character interface to avoid caching.  This is particularly
 336          * important if we're trying to look at a real in-kernel storage
 337          * pool from userland, e.g. via zdb, because otherwise we won't
 338          * see the changes occurring under the segmap cache.
 339          * On the other hand, the stupid character device returns zero
 340          * for its size.  So -- gag -- we open the block device to get
 341          * its size, and remember it for subsequent VOP_GETATTR().
 342          */
 343         if (strncmp(path, "/dev/", 5) == 0) {
 344                 char *dsk;
 345                 fd = open64(path, O_RDONLY);
 346                 if (fd == -1)
 347                         return (errno);
 348                 if (fstat64(fd, &st) == -1) {
 349                         close(fd);
 350                         return (errno);
 351                 }
 352                 close(fd);
 353                 (void) sprintf(realpath, "%s", path);
 354                 dsk = strstr(path, "/dsk/");
 355                 if (dsk != NULL)
 356                         (void) sprintf(realpath + (dsk - path) + 1, "r%s",
 357                             dsk + 1);
 358         } else {
 359                 (void) sprintf(realpath, "%s", path);
 360                 if (!(flags & FCREAT) && stat64(realpath, &st) == -1)
 361                         return (errno);
 362         }
 363
 364         if (flags & FCREAT)
 365                 old_umask = umask(0);
 366
 367         /*
 368          * The construct 'flags - FREAD' conveniently maps combinations of
 369          * FREAD and FWRITE to the corresponding O_RDONLY, O_WRONLY, and O_RDWR.
 370          */
 371         fd = open64(realpath, flags - FREAD, mode);
 372
 373         if (flags & FCREAT)
 374                 (void) umask(old_umask);
 375
 376         if (fd == -1)
 377                 return (errno);
 378
 379         if (fstat64(fd, &st) == -1) {
 380                 err = errno;
 381                 close(fd);
 382                 return (err);
 383         }
 384
 385         (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
 386
 387         *vpp = vp = umem_zalloc(sizeof (vnode_t), UMEM_NOFAIL);
 388
 389         vp->v_fd = fd;
 390         vp->v_size = st.st_size;
 391         vp->v_path = spa_strdup(path);
 392
 393         return (0);
 394 }
 395
 396 /*ARGSUSED*/
 397 int
 398 vn_openat(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2,
 399     int x3, vnode_t *startvp, int fd)
 400 {
 401         char *realpath = umem_alloc(strlen(path) + 2, UMEM_NOFAIL);
 402         int ret;
 403
 404         ASSERT(startvp == rootdir);
 405         (void) sprintf(realpath, "/%s", path);
 406
 407         /* fd ignored for now, need if want to simulate nbmand support */
 408         ret = vn_open(realpath, x1, flags, mode, vpp, x2, x3);
 409
 410         umem_free(realpath, strlen(path) + 2);
 411
 412         return (ret);
 413 }
 414
 415 /*ARGSUSED*/
 416 int
 417 vn_rdwr(int uio, vnode_t *vp, void *addr, ssize_t len, offset_t offset,
 418         int x1, int x2, rlim64_t x3, void *x4, ssize_t *residp)
 419 {
 420         ssize_t rc, done = 0, split;
 421
 422         if (uio == UIO_READ) {
 423                 rc = pread64(vp->v_fd, addr, len, offset);
 424         } else {
 425                 /*
 426                  * To simulate partial disk writes, we split writes into two
 427                  * system calls so that the process can be killed in between.
 428                  */
 429                 split = (len > 0 ? rand() % len : 0);
 430                 rc = pwrite64(vp->v_fd, addr, split, offset);
 431                 if (rc != -1) {
 432                         done = rc;
 433                         rc = pwrite64(vp->v_fd, (char *)addr + split,
 434                             len - split, offset + split);
 435                 }
 436         }
 437
 438         if (rc == -1)
 439                 return (errno);
 440
 441         done += rc;
 442
 443         if (residp)
 444                 *residp = len - done;
 445         else if (done != len)
 446                 return (EIO);
 447         return (0);
 448 }
 449
 450 void
 451 vn_close(vnode_t *vp)
 452 {
 453         close(vp->v_fd);
 454         spa_strfree(vp->v_path);
 455         umem_free(vp, sizeof (vnode_t));
 456 }
 457
 458 /*
 459  * At a minimum we need to update the size since vdev_reopen()
 460  * will no longer call vn_openat().
 461  */
 462 int
 463 fop_getattr(vnode_t *vp, vattr_t *vap)
 464 {
 465         struct stat64 st;
 466
 467         if (fstat64(vp->v_fd, &st) == -1) {
 468                 close(vp->v_fd);
 469                 return (errno);
 470         }
 471
 472         vap->va_size = st.st_size;
 473         return (0);
 474 }
 475
 476 #ifdef ZFS_DEBUG
 477
 478 /*
 479  * =========================================================================
 480  * Figure out which debugging statements to print
 481  * =========================================================================
 482  */
 483
 484 static char *dprintf_string;
 485 static int dprintf_print_all;
 486
 487 int
 488 dprintf_find_string(const char *string)
 489 {
 490         char *tmp_str = dprintf_string;
 491         int len = strlen(string);
 492
 493         /*
 494          * Find out if this is a string we want to print.
 495          * String format: file1.c,function_name1,file2.c,file3.c
 496          */
 497
 498         while (tmp_str != NULL) {
 499                 if (strncmp(tmp_str, string, len) == 0 &&
 500                     (tmp_str[len] == ',' || tmp_str[len] == '\0'))
 501                         return (1);
 502                 tmp_str = strchr(tmp_str, ',');
 503                 if (tmp_str != NULL)
 504                         tmp_str++; /* Get rid of , */
 505         }
 506         return (0);
 507 }
 508
 509 void
 510 dprintf_setup(int *argc, char **argv)
 511 {
 512         int i, j;
 513
 514         /*
 515          * Debugging can be specified two ways: by setting the
 516          * environment variable ZFS_DEBUG, or by including a
 517          * "debug=..."  argument on the command line.  The command
 518          * line setting overrides the environment variable.
 519          */
 520
 521         for (i = 1; i < *argc; i++) {
 522                 int len = strlen("debug=");
 523                 /* First look for a command line argument */
 524                 if (strncmp("debug=", argv[i], len) == 0) {
 525                         dprintf_string = argv[i] + len;
 526                         /* Remove from args */
 527                         for (j = i; j < *argc; j++)
 528                                 argv[j] = argv[j+1];
 529                         argv[j] = NULL;
 530                         (*argc)--;
 531                 }
 532         }
 533
 534         if (dprintf_string == NULL) {
 535                 /* Look for ZFS_DEBUG environment variable */
 536                 dprintf_string = getenv("ZFS_DEBUG");
 537         }
 538
 539         /*
 540          * Are we just turning on all debugging?
 541          */
 542         if (dprintf_find_string("on"))
 543                 dprintf_print_all = 1;
 544 }
 545
 546 /*
 547  * =========================================================================
 548  * debug printfs
 549  * =========================================================================
 550  */
 551 void
 552 __dprintf(const char *file, const char *func, int line, const char *fmt, ...)
 553 {
 554         const char *newfile;
 555         va_list adx;
 556
 557         /*
 558          * Get rid of annoying "../common/" prefix to filename.
 559          */
 560         newfile = strrchr(file, '/');
 561         if (newfile != NULL) {
 562                 newfile = newfile + 1; /* Get rid of leading / */
 563         } else {
 564                 newfile = file;
 565         }
 566
 567         if (dprintf_print_all ||
 568             dprintf_find_string(newfile) ||
 569             dprintf_find_string(func)) {
 570                 /* Print out just the function name if requested */
 571                 flockfile(stdout);
 572                 if (dprintf_find_string("pid"))
 573                         (void) printf("%d ", getpid());
 574                 if (dprintf_find_string("tid"))
 575                         (void) printf("%u ", thr_self());
 576                 if (dprintf_find_string("cpu"))
 577                         (void) printf("%u ", getcpuid());
 578                 if (dprintf_find_string("time"))
 579                         (void) printf("%llu ", gethrtime());
 580                 if (dprintf_find_string("long"))
 581                         (void) printf("%s, line %d: ", newfile, line);
 582                 (void) printf("%s: ", func);
 583                 va_start(adx, fmt);
 584                 (void) vprintf(fmt, adx);
 585                 va_end(adx);
 586                 funlockfile(stdout);
 587         }
 588 }
 589
 590 #endif /* ZFS_DEBUG */
 591
 592 /*
 593  * =========================================================================
 594  * cmn_err() and panic()
 595  * =========================================================================
 596  */
 597 static char ce_prefix[CE_IGNORE][10] = { "", "NOTICE: ", "WARNING: ", "" };
 598 static char ce_suffix[CE_IGNORE][2] = { "", "\n", "\n", "" };
 599
 600 void
 601 vpanic(const char *fmt, va_list adx)
 602 {
 603         (void) fprintf(stderr, "error: ");
 604         (void) vfprintf(stderr, fmt, adx);
 605         (void) fprintf(stderr, "\n");
 606
 607         abort();        /* think of it as a "user-level crash dump" */
 608 }
 609
 610 void
 611 panic(const char *fmt, ...)
 612 {
 613         va_list adx;
 614
 615         va_start(adx, fmt);
 616         vpanic(fmt, adx);
 617         va_end(adx);
 618 }
 619
 620 void
 621 vcmn_err(int ce, const char *fmt, va_list adx)
 622 {
 623         if (ce == CE_PANIC)
 624                 vpanic(fmt, adx);
 625         if (ce != CE_NOTE) {    /* suppress noise in userland stress testing */
 626                 (void) fprintf(stderr, "%s", ce_prefix[ce]);
 627                 (void) vfprintf(stderr, fmt, adx);
 628                 (void) fprintf(stderr, "%s", ce_suffix[ce]);
 629         }
 630 }
 631
 632 /*PRINTFLIKE2*/
 633 void
 634 cmn_err(int ce, const char *fmt, ...)
 635 {
 636         va_list adx;
 637
 638         va_start(adx, fmt);
 639         vcmn_err(ce, fmt, adx);
 640         va_end(adx);
 641 }
 642
 643 /*
 644  * =========================================================================
 645  * kobj interfaces
 646  * =========================================================================
 647  */
 648 struct _buf *
 649 kobj_open_file(char *name)
 650 {
 651         struct _buf *file;
 652         vnode_t *vp;
 653
 654         /* set vp as the _fd field of the file */
 655         if (vn_openat(name, UIO_SYSSPACE, FREAD, 0, &vp, 0, 0, rootdir,
 656             -1) != 0)
 657                 return ((void *)-1UL);
 658
 659         file = umem_zalloc(sizeof (struct _buf), UMEM_NOFAIL);
 660         file->_fd = (intptr_t)vp;
 661         return (file);
 662 }
 663
 664 int
 665 kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
 666 {
 667         ssize_t resid;
 668
 669         vn_rdwr(UIO_READ, (vnode_t *)file->_fd, buf, size, (offset_t)off,
 670             UIO_SYSSPACE, 0, 0, 0, &resid);
 671
 672         return (size - resid);
 673 }
 674
 675 void
 676 kobj_close_file(struct _buf *file)
 677 {
 678         vn_close((vnode_t *)file->_fd);
 679         umem_free(file, sizeof (struct _buf));
 680 }
 681
 682 int
 683 kobj_get_filesize(struct _buf *file, uint64_t *size)
 684 {
 685         struct stat64 st;
 686         vnode_t *vp = (vnode_t *)file->_fd;
 687
 688         if (fstat64(vp->v_fd, &st) == -1) {
 689                 vn_close(vp);
 690                 return (errno);
 691         }
 692         *size = st.st_size;
 693         return (0);
 694 }
 695
 696 /*
 697  * =========================================================================
 698  * misc routines
 699  * =========================================================================
 700  */
 701
 702 void
 703 delay(clock_t ticks)
 704 {
 705         poll(0, 0, ticks * (1000 / hz));
 706 }
 707
 708 /*
 709  * Find highest one bit set.
 710  *      Returns bit number + 1 of highest bit that is set, otherwise returns 0.
 711  * High order bit is 31 (or 63 in _LP64 kernel).
 712  */
 713 int
 714 highbit(ulong_t i)
 715 {
 716         register int h = 1;
 717
 718         if (i == 0)
 719                 return (0);
 720 #ifdef _LP64
 721         if (i & 0xffffffff00000000ul) {
 722                 h += 32; i >>= 32;
 723         }
 724 #endif
 725         if (i & 0xffff0000) {
 726                 h += 16; i >>= 16;
 727         }
 728         if (i & 0xff00) {
 729                 h += 8; i >>= 8;
 730         }
 731         if (i & 0xf0) {
 732                 h += 4; i >>= 4;
 733         }
 734         if (i & 0xc) {
 735                 h += 2; i >>= 2;
 736         }
 737         if (i & 0x2) {
 738                 h += 1;
 739         }
 740         return (h);
 741 }
 742
 743 static int random_fd = -1, urandom_fd = -1;
 744
 745 static int
 746 random_get_bytes_common(uint8_t *ptr, size_t len, int fd)
 747 {
 748         size_t resid = len;
 749         ssize_t bytes;
 750
 751         ASSERT(fd != -1);
 752
 753         while (resid != 0) {
 754                 bytes = read(fd, ptr, resid);
 755                 ASSERT3S(bytes, >=, 0);
 756                 ptr += bytes;
 757                 resid -= bytes;
 758         }
 759
 760         return (0);
 761 }
 762
 763 int
 764 random_get_bytes(uint8_t *ptr, size_t len)
 765 {
 766         return (random_get_bytes_common(ptr, len, random_fd));
 767 }
 768
 769 int
 770 random_get_pseudo_bytes(uint8_t *ptr, size_t len)
 771 {
 772         return (random_get_bytes_common(ptr, len, urandom_fd));
 773 }
 774
 775 int
 776 ddi_strtoul(const char *hw_serial, char **nptr, int base, unsigned long *result)
 777 {
 778         char *end;
 779
 780         *result = strtoul(hw_serial, &end, base);
 781         if (*result == 0)
 782                 return (errno);
 783         return (0);
 784 }
 785
 786 int
 787 ddi_strtoull(const char *str, char **nptr, int base, u_longlong_t *result)
 788 {
 789         char *end;
 790
 791         *result = strtoull(str, &end, base);
 792         if (*result == 0)
 793                 return (errno);
 794         return (0);
 795 }
 796
 797 /*
 798  * =========================================================================
 799  * kernel emulation setup & teardown
 800  * =========================================================================
 801  */
 802 static int
 803 umem_out_of_memory(void)
 804 {
 805         char errmsg[] = "out of memory -- generating core dump\n";
 806
 807         (void) fprintf(stderr, "%s", errmsg);
 808         abort();
 809         return (0);
 810 }
 811
 812 void
 813 kernel_init(int mode)
 814 {
 815         umem_nofail_callback(umem_out_of_memory);
 816
 817         physmem = sysconf(_SC_PHYS_PAGES);
 818
 819         dprintf("physmem = %llu pages (%.2f GB)\n", physmem,
 820             (double)physmem * sysconf(_SC_PAGE_SIZE) / (1ULL << 30));
 821
 822         (void) snprintf(hw_serial, sizeof (hw_serial), "%ld",
 823             (mode & FWRITE) ? gethostid() : 0);
 824
 825         VERIFY((random_fd = open("/dev/random", O_RDONLY)) != -1);
 826         VERIFY((urandom_fd = open("/dev/urandom", O_RDONLY)) != -1);
 827
 828         system_taskq_init();
 829
 830         spa_init(mode);
 831 }
 832
 833 void
 834 kernel_fini(void)
 835 {
 836         spa_fini();
 837
 838         system_taskq_fini();
 839
 840         close(random_fd);
 841         close(urandom_fd);
 842
 843         random_fd = -1;
 844         urandom_fd = -1;
 845 }
 846
 847 int
 848 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
 849 {
 850         int ret;
 851         uLongf len = *dstlen;
 852
 853         if ((ret = uncompress(dst, &len, src, srclen)) == Z_OK)
 854                 *dstlen = (size_t)len;
 855
 856         return (ret);
 857 }
 858
 859 int
 860 z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen,
 861     int level)
 862 {
 863         int ret;
 864         uLongf len = *dstlen;
 865
 866         if ((ret = compress2(dst, &len, src, srclen, level)) == Z_OK)
 867                 *dstlen = (size_t)len;
 868
 869         return (ret);
 870 }
 871
 872 uid_t
 873 crgetuid(cred_t *cr)
 874 {
 875         return (0);
 876 }
 877
 878 gid_t
 879 crgetgid(cred_t *cr)
 880 {
 881         return (0);
 882 }
 883
 884 int
 885 crgetngroups(cred_t *cr)
 886 {
 887         return (0);
 888 }
 889
 890 gid_t *
 891 crgetgroups(cred_t *cr)
 892 {
 893         return (NULL);
 894 }
 895
 896 int
 897 zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr)
 898 {
 899         return (0);
 900 }
 901
 902 int
 903 zfs_secpolicy_rename_perms(const char *from, const char *to, cred_t *cr)
 904 {
 905         return (0);
 906 }
 907
 908 int
 909 zfs_secpolicy_destroy_perms(const char *name, cred_t *cr)
 910 {
 911         return (0);
 912 }
 913
 914 ksiddomain_t *
 915 ksid_lookupdomain(const char *dom)
 916 {
 917         ksiddomain_t *kd;
 918
 919         kd = umem_zalloc(sizeof (ksiddomain_t), UMEM_NOFAIL);
 920         kd->kd_name = spa_strdup(dom);
 921         return (kd);
 922 }
 923
 924 void
 925 ksiddomain_rele(ksiddomain_t *ksid)
 926 {
 927         spa_strfree(ksid->kd_name);
 928         umem_free(ksid, sizeof (ksiddomain_t));
 929 }
 930
 931 /*
 932  * Do not change the length of the returned string; it must be freed
 933  * with strfree().
 934  */
 935 char *
 936 kmem_asprintf(const char *fmt, ...)
 937 {
 938         int size;
 939         va_list adx;
 940         char *buf;
 941
 942         va_start(adx, fmt);
 943         size = vsnprintf(NULL, 0, fmt, adx) + 1;
 944         va_end(adx);
 945
 946         buf = kmem_alloc(size, KM_SLEEP);
 947
 948         va_start(adx, fmt);
 949         size = vsnprintf(buf, size, fmt, adx);
 950         va_end(adx);
 951
 952         return (buf);
 953 }
 954
 955 /* ARGSUSED */
 956 int
 957 zfs_onexit_fd_hold(int fd, minor_t *minorp)
 958 {
 959         *minorp = 0;
 960         return (0);
 961 }
 962
 963 /* ARGSUSED */
 964 void
 965 zfs_onexit_fd_rele(int fd)
 966 {
 967 }
 968
 969 /* ARGSUSED */
 970 int
 971 zfs_onexit_add_cb(minor_t minor, void (*func)(void *), void *data,
 972     uint64_t *action_handle)
 973 {
 974         return (0);
 975 }
 976
 977 /* ARGSUSED */
 978 int
 979 zfs_onexit_del_cb(minor_t minor, uint64_t action_handle, boolean_t fire)
 980 {
 981         return (0);
 982 }
 983
 984 /* ARGSUSED */
 985 int
 986 zfs_onexit_cb_data(minor_t minor, uint64_t action_handle, void **data)
 987 {
 988         return (0);
 989 }