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
 332         /*
 333          * If we're accessing a real disk from userland, we need to use
 334          * the character interface to avoid caching.  This is particularly
 335          * important if we're trying to look at a real in-kernel storage
 336          * pool from userland, e.g. via zdb, because otherwise we won't
 337          * see the changes occurring under the segmap cache.
 338          * On the other hand, the stupid character device returns zero
 339          * for its size.  So -- gag -- we open the block device to get
 340          * its size, and remember it for subsequent VOP_GETATTR().
 341          */
 342         if (strncmp(path, "/dev/", 5) == 0) {
 343                 char *dsk;
 344                 fd = open64(path, O_RDONLY);
 345                 if (fd == -1)
 346                         return (errno);
 347                 if (fstat64(fd, &st) == -1) {
 348                         close(fd);
 349                         return (errno);
 350                 }
 351                 close(fd);
 352                 (void) sprintf(realpath, "%s", path);
 353                 dsk = strstr(path, "/dsk/");
 354                 if (dsk != NULL)
 355                         (void) sprintf(realpath + (dsk - path) + 1, "r%s",
 356                             dsk + 1);
 357         } else {
 358                 (void) sprintf(realpath, "%s", path);
 359                 if (!(flags & FCREAT) && stat64(realpath, &st) == -1)
 360                         return (errno);
 361         }
 362
 363         if (flags & FCREAT)
 364                 old_umask = umask(0);
 365
 366         /*
 367          * The construct 'flags - FREAD' conveniently maps combinations of
 368          * FREAD and FWRITE to the corresponding O_RDONLY, O_WRONLY, and O_RDWR.
 369          */
 370         fd = open64(realpath, flags - FREAD, mode);
 371
 372         if (flags & FCREAT)
 373                 (void) umask(old_umask);
 374
 375         if (fd == -1)
 376                 return (errno);
 377
 378         if (fstat64(fd, &st) == -1) {
 379                 close(fd);
 380                 return (errno);
 381         }
 382
 383         (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
 384
 385         *vpp = vp = umem_zalloc(sizeof (vnode_t), UMEM_NOFAIL);
 386
 387         vp->v_fd = fd;
 388         vp->v_size = st.st_size;
 389         vp->v_path = spa_strdup(path);
 390
 391         return (0);
 392 }
 393
 394 /*ARGSUSED*/
 395 int
 396 vn_openat(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2,
 397     int x3, vnode_t *startvp, int fd)
 398 {
 399         char *realpath = umem_alloc(strlen(path) + 2, UMEM_NOFAIL);
 400         int ret;
 401
 402         ASSERT(startvp == rootdir);
 403         (void) sprintf(realpath, "/%s", path);
 404
 405         /* fd ignored for now, need if want to simulate nbmand support */
 406         ret = vn_open(realpath, x1, flags, mode, vpp, x2, x3);
 407
 408         umem_free(realpath, strlen(path) + 2);
 409
 410         return (ret);
 411 }
 412
 413 /*ARGSUSED*/
 414 int
 415 vn_rdwr(int uio, vnode_t *vp, void *addr, ssize_t len, offset_t offset,
 416         int x1, int x2, rlim64_t x3, void *x4, ssize_t *residp)
 417 {
 418         ssize_t iolen, split;
 419
 420         if (uio == UIO_READ) {
 421                 iolen = pread64(vp->v_fd, addr, len, offset);
 422         } else {
 423                 /*
 424                  * To simulate partial disk writes, we split writes into two
 425                  * system calls so that the process can be killed in between.
 426                  */
 427                 split = (len > 0 ? rand() % len : 0);
 428                 iolen = pwrite64(vp->v_fd, addr, split, offset);
 429                 iolen += pwrite64(vp->v_fd, (char *)addr + split,
 430                     len - split, offset + split);
 431         }
 432
 433         if (iolen == -1)
 434                 return (errno);
 435         if (residp)
 436                 *residp = len - iolen;
 437         else if (iolen != len)
 438                 return (EIO);
 439         return (0);
 440 }
 441
 442 void
 443 vn_close(vnode_t *vp)
 444 {
 445         close(vp->v_fd);
 446         spa_strfree(vp->v_path);
 447         umem_free(vp, sizeof (vnode_t));
 448 }
 449
 450 /*
 451  * At a minimum we need to update the size since vdev_reopen()
 452  * will no longer call vn_openat().
 453  */
 454 int
 455 fop_getattr(vnode_t *vp, vattr_t *vap)
 456 {
 457         struct stat64 st;
 458
 459         if (fstat64(vp->v_fd, &st) == -1) {
 460                 close(vp->v_fd);
 461                 return (errno);
 462         }
 463
 464         vap->va_size = st.st_size;
 465         return (0);
 466 }
 467
 468 #ifdef ZFS_DEBUG
 469
 470 /*
 471  * =========================================================================
 472  * Figure out which debugging statements to print
 473  * =========================================================================
 474  */
 475
 476 static char *dprintf_string;
 477 static int dprintf_print_all;
 478
 479 int
 480 dprintf_find_string(const char *string)
 481 {
 482         char *tmp_str = dprintf_string;
 483         int len = strlen(string);
 484
 485         /*
 486          * Find out if this is a string we want to print.
 487          * String format: file1.c,function_name1,file2.c,file3.c
 488          */
 489
 490         while (tmp_str != NULL) {
 491                 if (strncmp(tmp_str, string, len) == 0 &&
 492                     (tmp_str[len] == ',' || tmp_str[len] == '\0'))
 493                         return (1);
 494                 tmp_str = strchr(tmp_str, ',');
 495                 if (tmp_str != NULL)
 496                         tmp_str++; /* Get rid of , */
 497         }
 498         return (0);
 499 }
 500
 501 void
 502 dprintf_setup(int *argc, char **argv)
 503 {
 504         int i, j;
 505
 506         /*
 507          * Debugging can be specified two ways: by setting the
 508          * environment variable ZFS_DEBUG, or by including a
 509          * "debug=..."  argument on the command line.  The command
 510          * line setting overrides the environment variable.
 511          */
 512
 513         for (i = 1; i < *argc; i++) {
 514                 int len = strlen("debug=");
 515                 /* First look for a command line argument */
 516                 if (strncmp("debug=", argv[i], len) == 0) {
 517                         dprintf_string = argv[i] + len;
 518                         /* Remove from args */
 519                         for (j = i; j < *argc; j++)
 520                                 argv[j] = argv[j+1];
 521                         argv[j] = NULL;
 522                         (*argc)--;
 523                 }
 524         }
 525
 526         if (dprintf_string == NULL) {
 527                 /* Look for ZFS_DEBUG environment variable */
 528                 dprintf_string = getenv("ZFS_DEBUG");
 529         }
 530
 531         /*
 532          * Are we just turning on all debugging?
 533          */
 534         if (dprintf_find_string("on"))
 535                 dprintf_print_all = 1;
 536 }
 537
 538 /*
 539  * =========================================================================
 540  * debug printfs
 541  * =========================================================================
 542  */
 543 void
 544 __dprintf(const char *file, const char *func, int line, const char *fmt, ...)
 545 {
 546         const char *newfile;
 547         va_list adx;
 548
 549         /*
 550          * Get rid of annoying "../common/" prefix to filename.
 551          */
 552         newfile = strrchr(file, '/');
 553         if (newfile != NULL) {
 554                 newfile = newfile + 1; /* Get rid of leading / */
 555         } else {
 556                 newfile = file;
 557         }
 558
 559         if (dprintf_print_all ||
 560             dprintf_find_string(newfile) ||
 561             dprintf_find_string(func)) {
 562                 /* Print out just the function name if requested */
 563                 flockfile(stdout);
 564                 if (dprintf_find_string("pid"))
 565                         (void) printf("%d ", getpid());
 566                 if (dprintf_find_string("tid"))
 567                         (void) printf("%u ", thr_self());
 568                 if (dprintf_find_string("cpu"))
 569                         (void) printf("%u ", getcpuid());
 570                 if (dprintf_find_string("time"))
 571                         (void) printf("%llu ", gethrtime());
 572                 if (dprintf_find_string("long"))
 573                         (void) printf("%s, line %d: ", newfile, line);
 574                 (void) printf("%s: ", func);
 575                 va_start(adx, fmt);
 576                 (void) vprintf(fmt, adx);
 577                 va_end(adx);
 578                 funlockfile(stdout);
 579         }
 580 }
 581
 582 #endif /* ZFS_DEBUG */
 583
 584 /*
 585  * =========================================================================
 586  * cmn_err() and panic()
 587  * =========================================================================
 588  */
 589 static char ce_prefix[CE_IGNORE][10] = { "", "NOTICE: ", "WARNING: ", "" };
 590 static char ce_suffix[CE_IGNORE][2] = { "", "\n", "\n", "" };
 591
 592 void
 593 vpanic(const char *fmt, va_list adx)
 594 {
 595         (void) fprintf(stderr, "error: ");
 596         (void) vfprintf(stderr, fmt, adx);
 597         (void) fprintf(stderr, "\n");
 598
 599         abort();        /* think of it as a "user-level crash dump" */
 600 }
 601
 602 void
 603 panic(const char *fmt, ...)
 604 {
 605         va_list adx;
 606
 607         va_start(adx, fmt);
 608         vpanic(fmt, adx);
 609         va_end(adx);
 610 }
 611
 612 void
 613 vcmn_err(int ce, const char *fmt, va_list adx)
 614 {
 615         if (ce == CE_PANIC)
 616                 vpanic(fmt, adx);
 617         if (ce != CE_NOTE) {    /* suppress noise in userland stress testing */
 618                 (void) fprintf(stderr, "%s", ce_prefix[ce]);
 619                 (void) vfprintf(stderr, fmt, adx);
 620                 (void) fprintf(stderr, "%s", ce_suffix[ce]);
 621         }
 622 }
 623
 624 /*PRINTFLIKE2*/
 625 void
 626 cmn_err(int ce, const char *fmt, ...)
 627 {
 628         va_list adx;
 629
 630         va_start(adx, fmt);
 631         vcmn_err(ce, fmt, adx);
 632         va_end(adx);
 633 }
 634
 635 /*
 636  * =========================================================================
 637  * kobj interfaces
 638  * =========================================================================
 639  */
 640 struct _buf *
 641 kobj_open_file(char *name)
 642 {
 643         struct _buf *file;
 644         vnode_t *vp;
 645
 646         /* set vp as the _fd field of the file */
 647         if (vn_openat(name, UIO_SYSSPACE, FREAD, 0, &vp, 0, 0, rootdir,
 648             -1) != 0)
 649                 return ((void *)-1UL);
 650
 651         file = umem_zalloc(sizeof (struct _buf), UMEM_NOFAIL);
 652         file->_fd = (intptr_t)vp;
 653         return (file);
 654 }
 655
 656 int
 657 kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
 658 {
 659         ssize_t resid;
 660
 661         vn_rdwr(UIO_READ, (vnode_t *)file->_fd, buf, size, (offset_t)off,
 662             UIO_SYSSPACE, 0, 0, 0, &resid);
 663
 664         return (size - resid);
 665 }
 666
 667 void
 668 kobj_close_file(struct _buf *file)
 669 {
 670         vn_close((vnode_t *)file->_fd);
 671         umem_free(file, sizeof (struct _buf));
 672 }
 673
 674 int
 675 kobj_get_filesize(struct _buf *file, uint64_t *size)
 676 {
 677         struct stat64 st;
 678         vnode_t *vp = (vnode_t *)file->_fd;
 679
 680         if (fstat64(vp->v_fd, &st) == -1) {
 681                 vn_close(vp);
 682                 return (errno);
 683         }
 684         *size = st.st_size;
 685         return (0);
 686 }
 687
 688 /*
 689  * =========================================================================
 690  * misc routines
 691  * =========================================================================
 692  */
 693
 694 void
 695 delay(clock_t ticks)
 696 {
 697         poll(0, 0, ticks * (1000 / hz));
 698 }
 699
 700 /*
 701  * Find highest one bit set.
 702  *      Returns bit number + 1 of highest bit that is set, otherwise returns 0.
 703  * High order bit is 31 (or 63 in _LP64 kernel).
 704  */
 705 int
 706 highbit(ulong_t i)
 707 {
 708         register int h = 1;
 709
 710         if (i == 0)
 711                 return (0);
 712 #ifdef _LP64
 713         if (i & 0xffffffff00000000ul) {
 714                 h += 32; i >>= 32;
 715         }
 716 #endif
 717         if (i & 0xffff0000) {
 718                 h += 16; i >>= 16;
 719         }
 720         if (i & 0xff00) {
 721                 h += 8; i >>= 8;
 722         }
 723         if (i & 0xf0) {
 724                 h += 4; i >>= 4;
 725         }
 726         if (i & 0xc) {
 727                 h += 2; i >>= 2;
 728         }
 729         if (i & 0x2) {
 730                 h += 1;
 731         }
 732         return (h);
 733 }
 734
 735 static int random_fd = -1, urandom_fd = -1;
 736
 737 static int
 738 random_get_bytes_common(uint8_t *ptr, size_t len, int fd)
 739 {
 740         size_t resid = len;
 741         ssize_t bytes;
 742
 743         ASSERT(fd != -1);
 744
 745         while (resid != 0) {
 746                 bytes = read(fd, ptr, resid);
 747                 ASSERT3S(bytes, >=, 0);
 748                 ptr += bytes;
 749                 resid -= bytes;
 750         }
 751
 752         return (0);
 753 }
 754
 755 int
 756 random_get_bytes(uint8_t *ptr, size_t len)
 757 {
 758         return (random_get_bytes_common(ptr, len, random_fd));
 759 }
 760
 761 int
 762 random_get_pseudo_bytes(uint8_t *ptr, size_t len)
 763 {
 764         return (random_get_bytes_common(ptr, len, urandom_fd));
 765 }
 766
 767 int
 768 ddi_strtoul(const char *hw_serial, char **nptr, int base, unsigned long *result)
 769 {
 770         char *end;
 771
 772         *result = strtoul(hw_serial, &end, base);
 773         if (*result == 0)
 774                 return (errno);
 775         return (0);
 776 }
 777
 778 int
 779 ddi_strtoull(const char *str, char **nptr, int base, u_longlong_t *result)
 780 {
 781         char *end;
 782
 783         *result = strtoull(str, &end, base);
 784         if (*result == 0)
 785                 return (errno);
 786         return (0);
 787 }
 788
 789 /*
 790  * =========================================================================
 791  * kernel emulation setup & teardown
 792  * =========================================================================
 793  */
 794 static int
 795 umem_out_of_memory(void)
 796 {
 797         char errmsg[] = "out of memory -- generating core dump\n";
 798
 799         (void) fprintf(stderr, "%s", errmsg);
 800         abort();
 801         return (0);
 802 }
 803
 804 void
 805 kernel_init(int mode)
 806 {
 807         umem_nofail_callback(umem_out_of_memory);
 808
 809         physmem = sysconf(_SC_PHYS_PAGES);
 810
 811         dprintf("physmem = %llu pages (%.2f GB)\n", physmem,
 812             (double)physmem * sysconf(_SC_PAGE_SIZE) / (1ULL << 30));
 813
 814         (void) snprintf(hw_serial, sizeof (hw_serial), "%ld",
 815             (mode & FWRITE) ? gethostid() : 0);
 816
 817         VERIFY((random_fd = open("/dev/random", O_RDONLY)) != -1);
 818         VERIFY((urandom_fd = open("/dev/urandom", O_RDONLY)) != -1);
 819
 820         system_taskq_init();
 821
 822         spa_init(mode);
 823 }
 824
 825 void
 826 kernel_fini(void)
 827 {
 828         spa_fini();
 829
 830         system_taskq_fini();
 831
 832         close(random_fd);
 833         close(urandom_fd);
 834
 835         random_fd = -1;
 836         urandom_fd = -1;
 837 }
 838
 839 int
 840 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
 841 {
 842         int ret;
 843         uLongf len = *dstlen;
 844
 845         if ((ret = uncompress(dst, &len, src, srclen)) == Z_OK)
 846                 *dstlen = (size_t)len;
 847
 848         return (ret);
 849 }
 850
 851 int
 852 z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen,
 853     int level)
 854 {
 855         int ret;
 856         uLongf len = *dstlen;
 857
 858         if ((ret = compress2(dst, &len, src, srclen, level)) == Z_OK)
 859                 *dstlen = (size_t)len;
 860
 861         return (ret);
 862 }
 863
 864 uid_t
 865 crgetuid(cred_t *cr)
 866 {
 867         return (0);
 868 }
 869
 870 gid_t
 871 crgetgid(cred_t *cr)
 872 {
 873         return (0);
 874 }
 875
 876 int
 877 crgetngroups(cred_t *cr)
 878 {
 879         return (0);
 880 }
 881
 882 gid_t *
 883 crgetgroups(cred_t *cr)
 884 {
 885         return (NULL);
 886 }
 887
 888 int
 889 zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr)
 890 {
 891         return (0);
 892 }
 893
 894 int
 895 zfs_secpolicy_rename_perms(const char *from, const char *to, cred_t *cr)
 896 {
 897         return (0);
 898 }
 899
 900 int
 901 zfs_secpolicy_destroy_perms(const char *name, cred_t *cr)
 902 {
 903         return (0);
 904 }
 905
 906 ksiddomain_t *
 907 ksid_lookupdomain(const char *dom)
 908 {
 909         ksiddomain_t *kd;
 910
 911         kd = umem_zalloc(sizeof (ksiddomain_t), UMEM_NOFAIL);
 912         kd->kd_name = spa_strdup(dom);
 913         return (kd);
 914 }
 915
 916 void
 917 ksiddomain_rele(ksiddomain_t *ksid)
 918 {
 919         spa_strfree(ksid->kd_name);
 920         umem_free(ksid, sizeof (ksiddomain_t));
 921 }
 922
 923 /*
 924  * Do not change the length of the returned string; it must be freed
 925  * with strfree().
 926  */
 927 char *
 928 kmem_asprintf(const char *fmt, ...)
 929 {
 930         int size;
 931         va_list adx;
 932         char *buf;
 933
 934         va_start(adx, fmt);
 935         size = vsnprintf(NULL, 0, fmt, adx) + 1;
 936         va_end(adx);
 937
 938         buf = kmem_alloc(size, KM_SLEEP);
 939
 940         va_start(adx, fmt);
 941         size = vsnprintf(buf, size, fmt, adx);
 942         va_end(adx);
 943
 944         return (buf);
 945 }
 946
 947 /* ARGSUSED */
 948 int
 949 zfs_onexit_fd_hold(int fd, minor_t *minorp)
 950 {
 951         *minorp = 0;
 952         return (0);
 953 }
 954
 955 /* ARGSUSED */
 956 void
 957 zfs_onexit_fd_rele(int fd)
 958 {
 959 }
 960
 961 /* ARGSUSED */
 962 int
 963 zfs_onexit_add_cb(minor_t minor, void (*func)(void *), void *data,
 964     uint64_t *action_handle)
 965 {
 966         return (0);
 967 }
 968
 969 /* ARGSUSED */
 970 int
 971 zfs_onexit_del_cb(minor_t minor, uint64_t action_handle, boolean_t fire)
 972 {
 973         return (0);
 974 }
 975
 976 /* ARGSUSED */
 977 int
 978 zfs_onexit_cb_data(minor_t minor, uint64_t action_handle, void **data)
 979 {
 980         return (0);
 981 }