usr/src/lib/libzpool/common/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  * Copyright (c) 2012 by Delphix. All rights reserved.
  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 kmutex_t cpu_lock;
  50 vmem_t *zio_arena = NULL;
  51
  52 struct utsname utsname = {
  53         "userland", "libzpool", "1", "1", "na"
  54 };
  55
  56 /* this only exists to have its address taken */
  57 struct proc p0;
  58
  59 /*
  60  * =========================================================================
  61  * threads
  62  * =========================================================================
  63  */
  64 /*ARGSUSED*/
  65 kthread_t *
  66 zk_thread_create(void (*func)(), void *arg)
  67 {
  68         thread_t tid;
  69
  70         VERIFY(thr_create(0, 0, (void *(*)(void *))func, arg, THR_DETACHED,
  71             &tid) == 0);
  72
  73         return ((void *)(uintptr_t)tid);
  74 }
  75
  76 /*
  77  * =========================================================================
  78  * kstats
  79  * =========================================================================
  80  */
  81 /*ARGSUSED*/
  82 kstat_t *
  83 kstat_create(char *module, int instance, char *name, char *class,
  84     uchar_t type, ulong_t ndata, uchar_t ks_flag)
  85 {
  86         return (NULL);
  87 }
  88
  89 /*ARGSUSED*/
  90 void
  91 kstat_install(kstat_t *ksp)
  92 {}
  93
  94 /*ARGSUSED*/
  95 void
  96 kstat_delete(kstat_t *ksp)
  97 {}
  98
  99 /*
 100  * =========================================================================
 101  * mutexes
 102  * =========================================================================
 103  */
 104 void
 105 zmutex_init(kmutex_t *mp)
 106 {
 107         mp->m_owner = NULL;
 108         mp->initialized = B_TRUE;
 109         (void) _mutex_init(&mp->m_lock, USYNC_THREAD, NULL);
 110 }
 111
 112 void
 113 zmutex_destroy(kmutex_t *mp)
 114 {
 115         ASSERT(mp->initialized == B_TRUE);
 116         ASSERT(mp->m_owner == NULL);
 117         (void) _mutex_destroy(&(mp)->m_lock);
 118         mp->m_owner = (void *)-1UL;
 119         mp->initialized = B_FALSE;
 120 }
 121
 122 void
 123 mutex_enter(kmutex_t *mp)
 124 {
 125         ASSERT(mp->initialized == B_TRUE);
 126         ASSERT(mp->m_owner != (void *)-1UL);
 127         ASSERT(mp->m_owner != curthread);
 128         VERIFY(mutex_lock(&mp->m_lock) == 0);
 129         ASSERT(mp->m_owner == NULL);
 130         mp->m_owner = curthread;
 131 }
 132
 133 int
 134 mutex_tryenter(kmutex_t *mp)
 135 {
 136         ASSERT(mp->initialized == B_TRUE);
 137         ASSERT(mp->m_owner != (void *)-1UL);
 138         if (0 == mutex_trylock(&mp->m_lock)) {
 139                 ASSERT(mp->m_owner == NULL);
 140                 mp->m_owner = curthread;
 141                 return (1);
 142         } else {
 143                 return (0);
 144         }
 145 }
 146
 147 void
 148 mutex_exit(kmutex_t *mp)
 149 {
 150         ASSERT(mp->initialized == B_TRUE);
 151         ASSERT(mutex_owner(mp) == curthread);
 152         mp->m_owner = NULL;
 153         VERIFY(mutex_unlock(&mp->m_lock) == 0);
 154 }
 155
 156 void *
 157 mutex_owner(kmutex_t *mp)
 158 {
 159         ASSERT(mp->initialized == B_TRUE);
 160         return (mp->m_owner);
 161 }
 162
 163 /*
 164  * =========================================================================
 165  * rwlocks
 166  * =========================================================================
 167  */
 168 /*ARGSUSED*/
 169 void
 170 rw_init(krwlock_t *rwlp, char *name, int type, void *arg)
 171 {
 172         rwlock_init(&rwlp->rw_lock, USYNC_THREAD, NULL);
 173         rwlp->rw_owner = NULL;
 174         rwlp->initialized = B_TRUE;
 175 }
 176
 177 void
 178 rw_destroy(krwlock_t *rwlp)
 179 {
 180         rwlock_destroy(&rwlp->rw_lock);
 181         rwlp->rw_owner = (void *)-1UL;
 182         rwlp->initialized = B_FALSE;
 183 }
 184
 185 void
 186 rw_enter(krwlock_t *rwlp, krw_t rw)
 187 {
 188         ASSERT(!RW_LOCK_HELD(rwlp));
 189         ASSERT(rwlp->initialized == B_TRUE);
 190         ASSERT(rwlp->rw_owner != (void *)-1UL);
 191         ASSERT(rwlp->rw_owner != curthread);
 192
 193         if (rw == RW_READER)
 194                 VERIFY(rw_rdlock(&rwlp->rw_lock) == 0);
 195         else
 196                 VERIFY(rw_wrlock(&rwlp->rw_lock) == 0);
 197
 198         rwlp->rw_owner = curthread;
 199 }
 200
 201 void
 202 rw_exit(krwlock_t *rwlp)
 203 {
 204         ASSERT(rwlp->initialized == B_TRUE);
 205         ASSERT(rwlp->rw_owner != (void *)-1UL);
 206
 207         rwlp->rw_owner = NULL;
 208         VERIFY(rw_unlock(&rwlp->rw_lock) == 0);
 209 }
 210
 211 int
 212 rw_tryenter(krwlock_t *rwlp, krw_t rw)
 213 {
 214         int rv;
 215
 216         ASSERT(rwlp->initialized == B_TRUE);
 217         ASSERT(rwlp->rw_owner != (void *)-1UL);
 218
 219         if (rw == RW_READER)
 220                 rv = rw_tryrdlock(&rwlp->rw_lock);
 221         else
 222                 rv = rw_trywrlock(&rwlp->rw_lock);
 223
 224         if (rv == 0) {
 225                 rwlp->rw_owner = curthread;
 226                 return (1);
 227         }
 228
 229         return (0);
 230 }
 231
 232 /*ARGSUSED*/
 233 int
 234 rw_tryupgrade(krwlock_t *rwlp)
 235 {
 236         ASSERT(rwlp->initialized == B_TRUE);
 237         ASSERT(rwlp->rw_owner != (void *)-1UL);
 238
 239         return (0);
 240 }
 241
 242 /*
 243  * =========================================================================
 244  * condition variables
 245  * =========================================================================
 246  */
 247 /*ARGSUSED*/
 248 void
 249 cv_init(kcondvar_t *cv, char *name, int type, void *arg)
 250 {
 251         VERIFY(cond_init(cv, type, NULL) == 0);
 252 }
 253
 254 void
 255 cv_destroy(kcondvar_t *cv)
 256 {
 257         VERIFY(cond_destroy(cv) == 0);
 258 }
 259
 260 void
 261 cv_wait(kcondvar_t *cv, kmutex_t *mp)
 262 {
 263         ASSERT(mutex_owner(mp) == curthread);
 264         mp->m_owner = NULL;
 265         int ret = cond_wait(cv, &mp->m_lock);
 266         VERIFY(ret == 0 || ret == EINTR);
 267         mp->m_owner = curthread;
 268 }
 269
 270 clock_t
 271 cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime)
 272 {
 273         int error;
 274         timestruc_t ts;
 275         clock_t delta;
 276
 277 top:
 278         delta = abstime - ddi_get_lbolt();
 279         if (delta <= 0)
 280                 return (-1);
 281
 282         ts.tv_sec = delta / hz;
 283         ts.tv_nsec = (delta % hz) * (NANOSEC / hz);
 284
 285         ASSERT(mutex_owner(mp) == curthread);
 286         mp->m_owner = NULL;
 287         error = cond_reltimedwait(cv, &mp->m_lock, &ts);
 288         mp->m_owner = curthread;
 289
 290         if (error == ETIME)
 291                 return (-1);
 292
 293         if (error == EINTR)
 294                 goto top;
 295
 296         ASSERT(error == 0);
 297
 298         return (1);
 299 }
 300
 301 void
 302 cv_signal(kcondvar_t *cv)
 303 {
 304         VERIFY(cond_signal(cv) == 0);
 305 }
 306
 307 void
 308 cv_broadcast(kcondvar_t *cv)
 309 {
 310         VERIFY(cond_broadcast(cv) == 0);
 311 }
 312
 313 /*
 314  * =========================================================================
 315  * vnode operations
 316  * =========================================================================
 317  */
 318 /*
 319  * Note: for the xxxat() versions of these functions, we assume that the
 320  * starting vp is always rootdir (which is true for spa_directory.c, the only
 321  * ZFS consumer of these interfaces).  We assert this is true, and then emulate
 322  * them by adding '/' in front of the path.
 323  */
 324
 325 /*ARGSUSED*/
 326 int
 327 vn_open(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2, int x3)
 328 {
 329         int fd;
 330         vnode_t *vp;
 331         int old_umask;
 332         char realpath[MAXPATHLEN];
 333         struct stat64 st;
 334
 335         /*
 336          * If we're accessing a real disk from userland, we need to use
 337          * the character interface to avoid caching.  This is particularly
 338          * important if we're trying to look at a real in-kernel storage
 339          * pool from userland, e.g. via zdb, because otherwise we won't
 340          * see the changes occurring under the segmap cache.
 341          * On the other hand, the stupid character device returns zero
 342          * for its size.  So -- gag -- we open the block device to get
 343          * its size, and remember it for subsequent VOP_GETATTR().
 344          */
 345         if (strncmp(path, "/dev/", 5) == 0) {
 346                 char *dsk;
 347                 fd = open64(path, O_RDONLY);
 348                 if (fd == -1)
 349                         return (errno);
 350                 if (fstat64(fd, &st) == -1) {
 351                         close(fd);
 352                         return (errno);
 353                 }
 354                 close(fd);
 355                 (void) sprintf(realpath, "%s", path);
 356                 dsk = strstr(path, "/dsk/");
 357                 if (dsk != NULL)
 358                         (void) sprintf(realpath + (dsk - path) + 1, "r%s",
 359                             dsk + 1);
 360         } else {
 361                 (void) sprintf(realpath, "%s", path);
 362                 if (!(flags & FCREAT) && stat64(realpath, &st) == -1)
 363                         return (errno);
 364         }
 365
 366         if (flags & FCREAT)
 367                 old_umask = umask(0);
 368
 369         /*
 370          * The construct 'flags - FREAD' conveniently maps combinations of
 371          * FREAD and FWRITE to the corresponding O_RDONLY, O_WRONLY, and O_RDWR.
 372          */
 373         fd = open64(realpath, flags - FREAD, mode);
 374
 375         if (flags & FCREAT)
 376                 (void) umask(old_umask);
 377
 378         if (fd == -1)
 379                 return (errno);
 380
 381         if (fstat64(fd, &st) == -1) {
 382                 close(fd);
 383                 return (errno);
 384         }
 385
 386         (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
 387
 388         *vpp = vp = umem_zalloc(sizeof (vnode_t), UMEM_NOFAIL);
 389
 390         vp->v_fd = fd;
 391         vp->v_size = st.st_size;
 392         vp->v_path = spa_strdup(path);
 393
 394         return (0);
 395 }
 396
 397 /*ARGSUSED*/
 398 int
 399 vn_openat(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2,
 400     int x3, vnode_t *startvp, int fd)
 401 {
 402         char *realpath = umem_alloc(strlen(path) + 2, UMEM_NOFAIL);
 403         int ret;
 404
 405         ASSERT(startvp == rootdir);
 406         (void) sprintf(realpath, "/%s", path);
 407
 408         /* fd ignored for now, need if want to simulate nbmand support */
 409         ret = vn_open(realpath, x1, flags, mode, vpp, x2, x3);
 410
 411         umem_free(realpath, strlen(path) + 2);
 412
 413         return (ret);
 414 }
 415
 416 /*ARGSUSED*/
 417 int
 418 vn_rdwr(int uio, vnode_t *vp, void *addr, ssize_t len, offset_t offset,
 419         int x1, int x2, rlim64_t x3, void *x4, ssize_t *residp)
 420 {
 421         ssize_t iolen, split;
 422
 423         if (uio == UIO_READ) {
 424                 iolen = pread64(vp->v_fd, addr, len, offset);
 425         } else {
 426                 /*
 427                  * To simulate partial disk writes, we split writes into two
 428                  * system calls so that the process can be killed in between.
 429                  */
 430                 int sectors = len >> SPA_MINBLOCKSHIFT;
 431                 split = (sectors > 0 ? rand() % sectors : 0) <<
 432                     SPA_MINBLOCKSHIFT;
 433                 iolen = pwrite64(vp->v_fd, addr, split, offset);
 434                 iolen += pwrite64(vp->v_fd, (char *)addr + split,
 435                     len - split, offset + split);
 436         }
 437
 438         if (iolen == -1)
 439                 return (errno);
 440         if (residp)
 441                 *residp = len - iolen;
 442         else if (iolen != len)
 443                 return (EIO);
 444         return (0);
 445 }
 446
 447 void
 448 vn_close(vnode_t *vp)
 449 {
 450         close(vp->v_fd);
 451         spa_strfree(vp->v_path);
 452         umem_free(vp, sizeof (vnode_t));
 453 }
 454
 455 /*
 456  * At a minimum we need to update the size since vdev_reopen()
 457  * will no longer call vn_openat().
 458  */
 459 int
 460 fop_getattr(vnode_t *vp, vattr_t *vap)
 461 {
 462         struct stat64 st;
 463
 464         if (fstat64(vp->v_fd, &st) == -1) {
 465                 close(vp->v_fd);
 466                 return (errno);
 467         }
 468
 469         vap->va_size = st.st_size;
 470         return (0);
 471 }
 472
 473 #ifdef ZFS_DEBUG
 474
 475 /*
 476  * =========================================================================
 477  * Figure out which debugging statements to print
 478  * =========================================================================
 479  */
 480
 481 static char *dprintf_string;
 482 static int dprintf_print_all;
 483
 484 int
 485 dprintf_find_string(const char *string)
 486 {
 487         char *tmp_str = dprintf_string;
 488         int len = strlen(string);
 489
 490         /*
 491          * Find out if this is a string we want to print.
 492          * String format: file1.c,function_name1,file2.c,file3.c
 493          */
 494
 495         while (tmp_str != NULL) {
 496                 if (strncmp(tmp_str, string, len) == 0 &&
 497                     (tmp_str[len] == ',' || tmp_str[len] == '\0'))
 498                         return (1);
 499                 tmp_str = strchr(tmp_str, ',');
 500                 if (tmp_str != NULL)
 501                         tmp_str++; /* Get rid of , */
 502         }
 503         return (0);
 504 }
 505
 506 void
 507 dprintf_setup(int *argc, char **argv)
 508 {
 509         int i, j;
 510
 511         /*
 512          * Debugging can be specified two ways: by setting the
 513          * environment variable ZFS_DEBUG, or by including a
 514          * "debug=..."  argument on the command line.  The command
 515          * line setting overrides the environment variable.
 516          */
 517
 518         for (i = 1; i < *argc; i++) {
 519                 int len = strlen("debug=");
 520                 /* First look for a command line argument */
 521                 if (strncmp("debug=", argv[i], len) == 0) {
 522                         dprintf_string = argv[i] + len;
 523                         /* Remove from args */
 524                         for (j = i; j < *argc; j++)
 525                                 argv[j] = argv[j+1];
 526                         argv[j] = NULL;
 527                         (*argc)--;
 528                 }
 529         }
 530
 531         if (dprintf_string == NULL) {
 532                 /* Look for ZFS_DEBUG environment variable */
 533                 dprintf_string = getenv("ZFS_DEBUG");
 534         }
 535
 536         /*
 537          * Are we just turning on all debugging?
 538          */
 539         if (dprintf_find_string("on"))
 540                 dprintf_print_all = 1;
 541 }
 542
 543 /*
 544  * =========================================================================
 545  * debug printfs
 546  * =========================================================================
 547  */
 548 void
 549 __dprintf(const char *file, const char *func, int line, const char *fmt, ...)
 550 {
 551         const char *newfile;
 552         va_list adx;
 553
 554         /*
 555          * Get rid of annoying "../common/" prefix to filename.
 556          */
 557         newfile = strrchr(file, '/');
 558         if (newfile != NULL) {
 559                 newfile = newfile + 1; /* Get rid of leading / */
 560         } else {
 561                 newfile = file;
 562         }
 563
 564         if (dprintf_print_all ||
 565             dprintf_find_string(newfile) ||
 566             dprintf_find_string(func)) {
 567                 /* Print out just the function name if requested */
 568                 flockfile(stdout);
 569                 if (dprintf_find_string("pid"))
 570                         (void) printf("%d ", getpid());
 571                 if (dprintf_find_string("tid"))
 572                         (void) printf("%u ", thr_self());
 573                 if (dprintf_find_string("cpu"))
 574                         (void) printf("%u ", getcpuid());
 575                 if (dprintf_find_string("time"))
 576                         (void) printf("%llu ", gethrtime());
 577                 if (dprintf_find_string("long"))
 578                         (void) printf("%s, line %d: ", newfile, line);
 579                 (void) printf("%s: ", func);
 580                 va_start(adx, fmt);
 581                 (void) vprintf(fmt, adx);
 582                 va_end(adx);
 583                 funlockfile(stdout);
 584         }
 585 }
 586
 587 #endif /* ZFS_DEBUG */
 588
 589 /*
 590  * =========================================================================
 591  * cmn_err() and panic()
 592  * =========================================================================
 593  */
 594 static char ce_prefix[CE_IGNORE][10] = { "", "NOTICE: ", "WARNING: ", "" };
 595 static char ce_suffix[CE_IGNORE][2] = { "", "\n", "\n", "" };
 596
 597 void
 598 vpanic(const char *fmt, va_list adx)
 599 {
 600         (void) fprintf(stderr, "error: ");
 601         (void) vfprintf(stderr, fmt, adx);
 602         (void) fprintf(stderr, "\n");
 603
 604         abort();        /* think of it as a "user-level crash dump" */
 605 }
 606
 607 void
 608 panic(const char *fmt, ...)
 609 {
 610         va_list adx;
 611
 612         va_start(adx, fmt);
 613         vpanic(fmt, adx);
 614         va_end(adx);
 615 }
 616
 617 void
 618 vcmn_err(int ce, const char *fmt, va_list adx)
 619 {
 620         if (ce == CE_PANIC)
 621                 vpanic(fmt, adx);
 622         if (ce != CE_NOTE) {    /* suppress noise in userland stress testing */
 623                 (void) fprintf(stderr, "%s", ce_prefix[ce]);
 624                 (void) vfprintf(stderr, fmt, adx);
 625                 (void) fprintf(stderr, "%s", ce_suffix[ce]);
 626         }
 627 }
 628
 629 /*PRINTFLIKE2*/
 630 void
 631 cmn_err(int ce, const char *fmt, ...)
 632 {
 633         va_list adx;
 634
 635         va_start(adx, fmt);
 636         vcmn_err(ce, fmt, adx);
 637         va_end(adx);
 638 }
 639
 640 /*
 641  * =========================================================================
 642  * kobj interfaces
 643  * =========================================================================
 644  */
 645 struct _buf *
 646 kobj_open_file(char *name)
 647 {
 648         struct _buf *file;
 649         vnode_t *vp;
 650
 651         /* set vp as the _fd field of the file */
 652         if (vn_openat(name, UIO_SYSSPACE, FREAD, 0, &vp, 0, 0, rootdir,
 653             -1) != 0)
 654                 return ((void *)-1UL);
 655
 656         file = umem_zalloc(sizeof (struct _buf), UMEM_NOFAIL);
 657         file->_fd = (intptr_t)vp;
 658         return (file);
 659 }
 660
 661 int
 662 kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
 663 {
 664         ssize_t resid;
 665
 666         vn_rdwr(UIO_READ, (vnode_t *)file->_fd, buf, size, (offset_t)off,
 667             UIO_SYSSPACE, 0, 0, 0, &resid);
 668
 669         return (size - resid);
 670 }
 671
 672 void
 673 kobj_close_file(struct _buf *file)
 674 {
 675         vn_close((vnode_t *)file->_fd);
 676         umem_free(file, sizeof (struct _buf));
 677 }
 678
 679 int
 680 kobj_get_filesize(struct _buf *file, uint64_t *size)
 681 {
 682         struct stat64 st;
 683         vnode_t *vp = (vnode_t *)file->_fd;
 684
 685         if (fstat64(vp->v_fd, &st) == -1) {
 686                 vn_close(vp);
 687                 return (errno);
 688         }
 689         *size = st.st_size;
 690         return (0);
 691 }
 692
 693 /*
 694  * =========================================================================
 695  * misc routines
 696  * =========================================================================
 697  */
 698
 699 void
 700 delay(clock_t ticks)
 701 {
 702         poll(0, 0, ticks * (1000 / hz));
 703 }
 704
 705 /*
 706  * Find highest one bit set.
 707  *      Returns bit number + 1 of highest bit that is set, otherwise returns 0.
 708  * High order bit is 31 (or 63 in _LP64 kernel).
 709  */
 710 int
 711 highbit(ulong_t i)
 712 {
 713         register int h = 1;
 714
 715         if (i == 0)
 716                 return (0);
 717 #ifdef _LP64
 718         if (i & 0xffffffff00000000ul) {
 719                 h += 32; i >>= 32;
 720         }
 721 #endif
 722         if (i & 0xffff0000) {
 723                 h += 16; i >>= 16;
 724         }
 725         if (i & 0xff00) {
 726                 h += 8; i >>= 8;
 727         }
 728         if (i & 0xf0) {
 729                 h += 4; i >>= 4;
 730         }
 731         if (i & 0xc) {
 732                 h += 2; i >>= 2;
 733         }
 734         if (i & 0x2) {
 735                 h += 1;
 736         }
 737         return (h);
 738 }
 739
 740 static int random_fd = -1, urandom_fd = -1;
 741
 742 static int
 743 random_get_bytes_common(uint8_t *ptr, size_t len, int fd)
 744 {
 745         size_t resid = len;
 746         ssize_t bytes;
 747
 748         ASSERT(fd != -1);
 749
 750         while (resid != 0) {
 751                 bytes = read(fd, ptr, resid);
 752                 ASSERT3S(bytes, >=, 0);
 753                 ptr += bytes;
 754                 resid -= bytes;
 755         }
 756
 757         return (0);
 758 }
 759
 760 int
 761 random_get_bytes(uint8_t *ptr, size_t len)
 762 {
 763         return (random_get_bytes_common(ptr, len, random_fd));
 764 }
 765
 766 int
 767 random_get_pseudo_bytes(uint8_t *ptr, size_t len)
 768 {
 769         return (random_get_bytes_common(ptr, len, urandom_fd));
 770 }
 771
 772 int
 773 ddi_strtoul(const char *hw_serial, char **nptr, int base, unsigned long *result)
 774 {
 775         char *end;
 776
 777         *result = strtoul(hw_serial, &end, base);
 778         if (*result == 0)
 779                 return (errno);
 780         return (0);
 781 }
 782
 783 int
 784 ddi_strtoull(const char *str, char **nptr, int base, u_longlong_t *result)
 785 {
 786         char *end;
 787
 788         *result = strtoull(str, &end, base);
 789         if (*result == 0)
 790                 return (errno);
 791         return (0);
 792 }
 793
 794 /* ARGSUSED */
 795 cyclic_id_t
 796 cyclic_add(cyc_handler_t *hdlr, cyc_time_t *when)
 797 {
 798         return (1);
 799 }
 800
 801 /* ARGSUSED */
 802 void
 803 cyclic_remove(cyclic_id_t id)
 804 {
 805 }
 806
 807 /* ARGSUSED */
 808 int
 809 cyclic_reprogram(cyclic_id_t id, hrtime_t expiration)
 810 {
 811         return (1);
 812 }
 813
 814 /*
 815  * =========================================================================
 816  * kernel emulation setup & teardown
 817  * =========================================================================
 818  */
 819 static int
 820 umem_out_of_memory(void)
 821 {
 822         char errmsg[] = "out of memory -- generating core dump\n";
 823
 824         write(fileno(stderr), errmsg, sizeof (errmsg));
 825         abort();
 826         return (0);
 827 }
 828
 829 void
 830 kernel_init(int mode)
 831 {
 832         umem_nofail_callback(umem_out_of_memory);
 833
 834         physmem = sysconf(_SC_PHYS_PAGES);
 835
 836         dprintf("physmem = %llu pages (%.2f GB)\n", physmem,
 837             (double)physmem * sysconf(_SC_PAGE_SIZE) / (1ULL << 30));
 838
 839         (void) snprintf(hw_serial, sizeof (hw_serial), "%ld",
 840             (mode & FWRITE) ? gethostid() : 0);
 841
 842         VERIFY((random_fd = open("/dev/random", O_RDONLY)) != -1);
 843         VERIFY((urandom_fd = open("/dev/urandom", O_RDONLY)) != -1);
 844
 845         system_taskq_init();
 846
 847         mutex_init(&cpu_lock, NULL, MUTEX_DEFAULT, NULL);
 848
 849         spa_init(mode);
 850 }
 851
 852 void
 853 kernel_fini(void)
 854 {
 855         spa_fini();
 856
 857         system_taskq_fini();
 858
 859         close(random_fd);
 860         close(urandom_fd);
 861
 862         random_fd = -1;
 863         urandom_fd = -1;
 864 }
 865
 866 int
 867 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
 868 {
 869         int ret;
 870         uLongf len = *dstlen;
 871
 872         if ((ret = uncompress(dst, &len, src, srclen)) == Z_OK)
 873                 *dstlen = (size_t)len;
 874
 875         return (ret);
 876 }
 877
 878 int
 879 z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen,
 880     int level)
 881 {
 882         int ret;
 883         uLongf len = *dstlen;
 884
 885         if ((ret = compress2(dst, &len, src, srclen, level)) == Z_OK)
 886                 *dstlen = (size_t)len;
 887
 888         return (ret);
 889 }
 890
 891 uid_t
 892 crgetuid(cred_t *cr)
 893 {
 894         return (0);
 895 }
 896
 897 uid_t
 898 crgetruid(cred_t *cr)
 899 {
 900         return (0);
 901 }
 902
 903 gid_t
 904 crgetgid(cred_t *cr)
 905 {
 906         return (0);
 907 }
 908
 909 int
 910 crgetngroups(cred_t *cr)
 911 {
 912         return (0);
 913 }
 914
 915 gid_t *
 916 crgetgroups(cred_t *cr)
 917 {
 918         return (NULL);
 919 }
 920
 921 int
 922 zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr)
 923 {
 924         return (0);
 925 }
 926
 927 int
 928 zfs_secpolicy_rename_perms(const char *from, const char *to, cred_t *cr)
 929 {
 930         return (0);
 931 }
 932
 933 int
 934 zfs_secpolicy_destroy_perms(const char *name, cred_t *cr)
 935 {
 936         return (0);
 937 }
 938
 939 ksiddomain_t *
 940 ksid_lookupdomain(const char *dom)
 941 {
 942         ksiddomain_t *kd;
 943
 944         kd = umem_zalloc(sizeof (ksiddomain_t), UMEM_NOFAIL);
 945         kd->kd_name = spa_strdup(dom);
 946         return (kd);
 947 }
 948
 949 void
 950 ksiddomain_rele(ksiddomain_t *ksid)
 951 {
 952         spa_strfree(ksid->kd_name);
 953         umem_free(ksid, sizeof (ksiddomain_t));
 954 }
 955
 956 /*
 957  * Do not change the length of the returned string; it must be freed
 958  * with strfree().
 959  */
 960 char *
 961 kmem_asprintf(const char *fmt, ...)
 962 {
 963         int size;
 964         va_list adx;
 965         char *buf;
 966
 967         va_start(adx, fmt);
 968         size = vsnprintf(NULL, 0, fmt, adx) + 1;
 969         va_end(adx);
 970
 971         buf = kmem_alloc(size, KM_SLEEP);
 972
 973         va_start(adx, fmt);
 974         size = vsnprintf(buf, size, fmt, adx);
 975         va_end(adx);
 976
 977         return (buf);
 978 }
 979
 980 /* ARGSUSED */
 981 int
 982 zfs_onexit_fd_hold(int fd, minor_t *minorp)
 983 {
 984         *minorp = 0;
 985         return (0);
 986 }
 987
 988 /* ARGSUSED */
 989 void
 990 zfs_onexit_fd_rele(int fd)
 991 {
 992 }
 993
 994 /* ARGSUSED */
 995 int
 996 zfs_onexit_add_cb(minor_t minor, void (*func)(void *), void *data,
 997     uint64_t *action_handle)
 998 {
 999         return (0);
1000 }
1001
1002 /* ARGSUSED */
1003 int
1004 zfs_onexit_del_cb(minor_t minor, uint64_t action_handle, boolean_t fire)
1005 {
1006         return (0);
1007 }
1008
1009 /* ARGSUSED */
1010 int
1011 zfs_onexit_cb_data(minor_t minor, uint64_t action_handle, void **data)
1012 {
1013         return (0);
1014 }