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