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  * Copyright (c) 2016 Actifio, Inc. 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 <libgen.h>
  34 #include <sys/signal.h>
  35 #include <sys/spa.h>
  36 #include <sys/stat.h>
  37 #include <sys/processor.h>
  38 #include <sys/zfs_context.h>
  39 #include <sys/rrwlock.h>
  40 #include <sys/utsname.h>
  41 #include <sys/time.h>
  42 #include <sys/systeminfo.h>
  43 #include <zfs_fletcher.h>
  44 #include <sys/crypto/icp.h>
  45
  46 /*
  47  * Emulation of kernel services in userland.
  48  */
  49
  50 int aok;
  51 uint64_t physmem;
  52 vnode_t *rootdir = (vnode_t *)0xabcd1234;
  53 char hw_serial[HW_HOSTID_LEN];
  54 struct utsname hw_utsname;
  55 vmem_t *zio_arena = NULL;
  56
  57 /* If set, all blocks read will be copied to the specified directory. */
  58 char *vn_dumpdir = NULL;
  59
  60 /* this only exists to have its address taken */
  61 struct proc p0;
  62
  63 /*
  64  * =========================================================================
  65  * threads
  66  * =========================================================================
  67  *
  68  * TS_STACK_MIN is dictated by the minimum allowed pthread stack size.  While
  69  * TS_STACK_MAX is somewhat arbitrary, it was selected to be large enough for
  70  * the expected stack depth while small enough to avoid exhausting address
  71  * space with high thread counts.
  72  */
  73 #define TS_STACK_MIN    MAX(PTHREAD_STACK_MIN, 32768)
  74 #define TS_STACK_MAX    (256 * 1024)
  75
  76 /*ARGSUSED*/
  77 kthread_t *
  78 zk_thread_create(void (*func)(void *), void *arg, size_t stksize, int state)
  79 {
  80         pthread_attr_t attr;
  81         pthread_t tid;
  82         char *stkstr;
  83         int detachstate = PTHREAD_CREATE_DETACHED;
  84
  85         VERIFY0(pthread_attr_init(&attr));
  86
  87         if (state & TS_JOINABLE)
  88                 detachstate = PTHREAD_CREATE_JOINABLE;
  89
  90         VERIFY0(pthread_attr_setdetachstate(&attr, detachstate));
  91
  92         /*
  93          * We allow the default stack size in user space to be specified by
  94          * setting the ZFS_STACK_SIZE environment variable.  This allows us
  95          * the convenience of observing and debugging stack overruns in
  96          * user space.  Explicitly specified stack sizes will be honored.
  97          * The usage of ZFS_STACK_SIZE is discussed further in the
  98          * ENVIRONMENT VARIABLES sections of the ztest(1) man page.
  99          */
 100         if (stksize == 0) {
 101                 stkstr = getenv("ZFS_STACK_SIZE");
 102
 103                 if (stkstr == NULL)
 104                         stksize = TS_STACK_MAX;
 105                 else
 106                         stksize = MAX(atoi(stkstr), TS_STACK_MIN);
 107         }
 108
 109         VERIFY3S(stksize, >, 0);
 110         stksize = P2ROUNDUP(MAX(stksize, TS_STACK_MIN), PAGESIZE);
 111
 112         /*
 113          * If this ever fails, it may be because the stack size is not a
 114          * multiple of system page size.
 115          */
 116         VERIFY0(pthread_attr_setstacksize(&attr, stksize));
 117         VERIFY0(pthread_attr_setguardsize(&attr, PAGESIZE));
 118
 119         VERIFY0(pthread_create(&tid, &attr, (void *(*)(void *))func, arg));
 120         VERIFY0(pthread_attr_destroy(&attr));
 121
 122         return ((void *)(uintptr_t)tid);
 123 }
 124
 125 /*
 126  * =========================================================================
 127  * kstats
 128  * =========================================================================
 129  */
 130 /*ARGSUSED*/
 131 kstat_t *
 132 kstat_create(const char *module, int instance, const char *name,
 133     const char *class, uchar_t type, ulong_t ndata, uchar_t ks_flag)
 134 {
 135         return (NULL);
 136 }
 137
 138 /*ARGSUSED*/
 139 void
 140 kstat_install(kstat_t *ksp)
 141 {}
 142
 143 /*ARGSUSED*/
 144 void
 145 kstat_delete(kstat_t *ksp)
 146 {}
 147
 148 /*ARGSUSED*/
 149 void
 150 kstat_waitq_enter(kstat_io_t *kiop)
 151 {}
 152
 153 /*ARGSUSED*/
 154 void
 155 kstat_waitq_exit(kstat_io_t *kiop)
 156 {}
 157
 158 /*ARGSUSED*/
 159 void
 160 kstat_runq_enter(kstat_io_t *kiop)
 161 {}
 162
 163 /*ARGSUSED*/
 164 void
 165 kstat_runq_exit(kstat_io_t *kiop)
 166 {}
 167
 168 /*ARGSUSED*/
 169 void
 170 kstat_waitq_to_runq(kstat_io_t *kiop)
 171 {}
 172
 173 /*ARGSUSED*/
 174 void
 175 kstat_runq_back_to_waitq(kstat_io_t *kiop)
 176 {}
 177
 178 void
 179 kstat_set_raw_ops(kstat_t *ksp,
 180     int (*headers)(char *buf, size_t size),
 181     int (*data)(char *buf, size_t size, void *data),
 182     void *(*addr)(kstat_t *ksp, loff_t index))
 183 {}
 184
 185 /*
 186  * =========================================================================
 187  * mutexes
 188  * =========================================================================
 189  */
 190
 191 void
 192 mutex_init(kmutex_t *mp, char *name, int type, void *cookie)
 193 {
 194         VERIFY0(pthread_mutex_init(&mp->m_lock, NULL));
 195         memset(&mp->m_owner, 0, sizeof (pthread_t));
 196 }
 197
 198 void
 199 mutex_destroy(kmutex_t *mp)
 200 {
 201         VERIFY0(pthread_mutex_destroy(&mp->m_lock));
 202 }
 203
 204 void
 205 mutex_enter(kmutex_t *mp)
 206 {
 207         VERIFY0(pthread_mutex_lock(&mp->m_lock));
 208         mp->m_owner = pthread_self();
 209 }
 210
 211 int
 212 mutex_tryenter(kmutex_t *mp)
 213 {
 214         int error;
 215
 216         error = pthread_mutex_trylock(&mp->m_lock);
 217         if (error == 0) {
 218                 mp->m_owner = pthread_self();
 219                 return (1);
 220         } else {
 221                 VERIFY3S(error, ==, EBUSY);
 222                 return (0);
 223         }
 224 }
 225
 226 void
 227 mutex_exit(kmutex_t *mp)
 228 {
 229         memset(&mp->m_owner, 0, sizeof (pthread_t));
 230         VERIFY0(pthread_mutex_unlock(&mp->m_lock));
 231 }
 232
 233 /*
 234  * =========================================================================
 235  * rwlocks
 236  * =========================================================================
 237  */
 238
 239 void
 240 rw_init(krwlock_t *rwlp, char *name, int type, void *arg)
 241 {
 242         VERIFY0(pthread_rwlock_init(&rwlp->rw_lock, NULL));
 243         rwlp->rw_readers = 0;
 244         rwlp->rw_owner = 0;
 245 }
 246
 247 void
 248 rw_destroy(krwlock_t *rwlp)
 249 {
 250         VERIFY0(pthread_rwlock_destroy(&rwlp->rw_lock));
 251 }
 252
 253 void
 254 rw_enter(krwlock_t *rwlp, krw_t rw)
 255 {
 256         if (rw == RW_READER) {
 257                 VERIFY0(pthread_rwlock_rdlock(&rwlp->rw_lock));
 258                 atomic_inc_uint(&rwlp->rw_readers);
 259         } else {
 260                 VERIFY0(pthread_rwlock_wrlock(&rwlp->rw_lock));
 261                 rwlp->rw_owner = pthread_self();
 262         }
 263 }
 264
 265 void
 266 rw_exit(krwlock_t *rwlp)
 267 {
 268         if (RW_READ_HELD(rwlp))
 269                 atomic_dec_uint(&rwlp->rw_readers);
 270         else
 271                 rwlp->rw_owner = 0;
 272
 273         VERIFY0(pthread_rwlock_unlock(&rwlp->rw_lock));
 274 }
 275
 276 int
 277 rw_tryenter(krwlock_t *rwlp, krw_t rw)
 278 {
 279         int error;
 280
 281         if (rw == RW_READER)
 282                 error = pthread_rwlock_tryrdlock(&rwlp->rw_lock);
 283         else
 284                 error = pthread_rwlock_trywrlock(&rwlp->rw_lock);
 285
 286         if (error == 0) {
 287                 if (rw == RW_READER)
 288                         atomic_inc_uint(&rwlp->rw_readers);
 289                 else
 290                         rwlp->rw_owner = pthread_self();
 291
 292                 return (1);
 293         }
 294
 295         VERIFY3S(error, ==, EBUSY);
 296
 297         return (0);
 298 }
 299
 300 /* ARGSUSED */
 301 uint32_t
 302 zone_get_hostid(void *zonep)
 303 {
 304         /*
 305          * We're emulating the system's hostid in userland.
 306          */
 307         return (strtoul(hw_serial, NULL, 10));
 308 }
 309
 310 int
 311 rw_tryupgrade(krwlock_t *rwlp)
 312 {
 313         return (0);
 314 }
 315
 316 /*
 317  * =========================================================================
 318  * condition variables
 319  * =========================================================================
 320  */
 321
 322 void
 323 cv_init(kcondvar_t *cv, char *name, int type, void *arg)
 324 {
 325         VERIFY0(pthread_cond_init(cv, NULL));
 326 }
 327
 328 void
 329 cv_destroy(kcondvar_t *cv)
 330 {
 331         VERIFY0(pthread_cond_destroy(cv));
 332 }
 333
 334 void
 335 cv_wait(kcondvar_t *cv, kmutex_t *mp)
 336 {
 337         memset(&mp->m_owner, 0, sizeof (pthread_t));
 338         VERIFY0(pthread_cond_wait(cv, &mp->m_lock));
 339         mp->m_owner = pthread_self();
 340 }
 341
 342 clock_t
 343 cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime)
 344 {
 345         int error;
 346         struct timeval tv;
 347         struct timespec ts;
 348         clock_t delta;
 349
 350         delta = abstime - ddi_get_lbolt();
 351         if (delta <= 0)
 352                 return (-1);
 353
 354         VERIFY(gettimeofday(&tv, NULL) == 0);
 355
 356         ts.tv_sec = tv.tv_sec + delta / hz;
 357         ts.tv_nsec = tv.tv_usec * NSEC_PER_USEC + (delta % hz) * (NANOSEC / hz);
 358         if (ts.tv_nsec >= NANOSEC) {
 359                 ts.tv_sec++;
 360                 ts.tv_nsec -= NANOSEC;
 361         }
 362
 363         memset(&mp->m_owner, 0, sizeof (pthread_t));
 364         error = pthread_cond_timedwait(cv, &mp->m_lock, &ts);
 365         mp->m_owner = pthread_self();
 366
 367         if (error == ETIMEDOUT)
 368                 return (-1);
 369
 370         VERIFY0(error);
 371
 372         return (1);
 373 }
 374
 375 /*ARGSUSED*/
 376 clock_t
 377 cv_timedwait_hires(kcondvar_t *cv, kmutex_t *mp, hrtime_t tim, hrtime_t res,
 378     int flag)
 379 {
 380         int error;
 381         struct timeval tv;
 382         struct timespec ts;
 383         hrtime_t delta;
 384
 385         ASSERT(flag == 0 || flag == CALLOUT_FLAG_ABSOLUTE);
 386
 387         delta = tim;
 388         if (flag & CALLOUT_FLAG_ABSOLUTE)
 389                 delta -= gethrtime();
 390
 391         if (delta <= 0)
 392                 return (-1);
 393
 394         VERIFY0(gettimeofday(&tv, NULL));
 395
 396         ts.tv_sec = tv.tv_sec + delta / NANOSEC;
 397         ts.tv_nsec = tv.tv_usec * NSEC_PER_USEC + (delta % NANOSEC);
 398         if (ts.tv_nsec >= NANOSEC) {
 399                 ts.tv_sec++;
 400                 ts.tv_nsec -= NANOSEC;
 401         }
 402
 403         memset(&mp->m_owner, 0, sizeof (pthread_t));
 404         error = pthread_cond_timedwait(cv, &mp->m_lock, &ts);
 405         mp->m_owner = pthread_self();
 406
 407         if (error == ETIMEDOUT)
 408                 return (-1);
 409
 410         VERIFY0(error);
 411
 412         return (1);
 413 }
 414
 415 void
 416 cv_signal(kcondvar_t *cv)
 417 {
 418         VERIFY0(pthread_cond_signal(cv));
 419 }
 420
 421 void
 422 cv_broadcast(kcondvar_t *cv)
 423 {
 424         VERIFY0(pthread_cond_broadcast(cv));
 425 }
 426
 427 /*
 428  * =========================================================================
 429  * procfs list
 430  * =========================================================================
 431  */
 432
 433 void
 434 seq_printf(struct seq_file *m, const char *fmt, ...)
 435 {}
 436
 437 void
 438 procfs_list_install(const char *module,
 439     const char *name,
 440     procfs_list_t *procfs_list,
 441     int (*show)(struct seq_file *f, void *p),
 442     int (*show_header)(struct seq_file *f),
 443     int (*clear)(procfs_list_t *procfs_list),
 444     size_t procfs_list_node_off)
 445 {
 446         mutex_init(&procfs_list->pl_lock, NULL, MUTEX_DEFAULT, NULL);
 447         list_create(&procfs_list->pl_list,
 448             procfs_list_node_off + sizeof (procfs_list_node_t),
 449             procfs_list_node_off + offsetof(procfs_list_node_t, pln_link));
 450         procfs_list->pl_next_id = 1;
 451         procfs_list->pl_node_offset = procfs_list_node_off;
 452 }
 453
 454 void
 455 procfs_list_uninstall(procfs_list_t *procfs_list)
 456 {}
 457
 458 void
 459 procfs_list_destroy(procfs_list_t *procfs_list)
 460 {
 461         ASSERT(list_is_empty(&procfs_list->pl_list));
 462         list_destroy(&procfs_list->pl_list);
 463         mutex_destroy(&procfs_list->pl_lock);
 464 }
 465
 466 #define NODE_ID(procfs_list, obj) \
 467                 (((procfs_list_node_t *)(((char *)obj) + \
 468                 (procfs_list)->pl_node_offset))->pln_id)
 469
 470 void
 471 procfs_list_add(procfs_list_t *procfs_list, void *p)
 472 {
 473         ASSERT(MUTEX_HELD(&procfs_list->pl_lock));
 474         NODE_ID(procfs_list, p) = procfs_list->pl_next_id++;
 475         list_insert_tail(&procfs_list->pl_list, p);
 476 }
 477
 478 /*
 479  * =========================================================================
 480  * vnode operations
 481  * =========================================================================
 482  */
 483 /*
 484  * Note: for the xxxat() versions of these functions, we assume that the
 485  * starting vp is always rootdir (which is true for spa_directory.c, the only
 486  * ZFS consumer of these interfaces).  We assert this is true, and then emulate
 487  * them by adding '/' in front of the path.
 488  */
 489
 490 /*ARGSUSED*/
 491 int
 492 vn_open(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2, int x3)
 493 {
 494         int fd = -1;
 495         int dump_fd = -1;
 496         vnode_t *vp;
 497         int old_umask = 0;
 498         char *realpath;
 499         struct stat64 st;
 500         int err;
 501
 502         realpath = umem_alloc(MAXPATHLEN, UMEM_NOFAIL);
 503
 504         /*
 505          * If we're accessing a real disk from userland, we need to use
 506          * the character interface to avoid caching.  This is particularly
 507          * important if we're trying to look at a real in-kernel storage
 508          * pool from userland, e.g. via zdb, because otherwise we won't
 509          * see the changes occurring under the segmap cache.
 510          * On the other hand, the stupid character device returns zero
 511          * for its size.  So -- gag -- we open the block device to get
 512          * its size, and remember it for subsequent VOP_GETATTR().
 513          */
 514 #if defined(__sun__) || defined(__sun)
 515         if (strncmp(path, "/dev/", 5) == 0) {
 516 #else
 517         if (0) {
 518 #endif
 519                 char *dsk;
 520                 fd = open64(path, O_RDONLY);
 521                 if (fd == -1) {
 522                         err = errno;
 523                         free(realpath);
 524                         return (err);
 525                 }
 526                 if (fstat64(fd, &st) == -1) {
 527                         err = errno;
 528                         close(fd);
 529                         free(realpath);
 530                         return (err);
 531                 }
 532                 close(fd);
 533                 (void) sprintf(realpath, "%s", path);
 534                 dsk = strstr(path, "/dsk/");
 535                 if (dsk != NULL)
 536                         (void) sprintf(realpath + (dsk - path) + 1, "r%s",
 537                             dsk + 1);
 538         } else {
 539                 (void) sprintf(realpath, "%s", path);
 540                 if (!(flags & FCREAT) && stat64(realpath, &st) == -1) {
 541                         err = errno;
 542                         free(realpath);
 543                         return (err);
 544                 }
 545         }
 546
 547         if (!(flags & FCREAT) && S_ISBLK(st.st_mode)) {
 548 #ifdef __linux__
 549                 flags |= O_DIRECT;
 550 #endif
 551         }
 552
 553         if (flags & FCREAT)
 554                 old_umask = umask(0);
 555
 556         /*
 557          * The construct 'flags - FREAD' conveniently maps combinations of
 558          * FREAD and FWRITE to the corresponding O_RDONLY, O_WRONLY, and O_RDWR.
 559          */
 560         fd = open64(realpath, flags - FREAD, mode);
 561         if (fd == -1) {
 562                 err = errno;
 563                 free(realpath);
 564                 return (err);
 565         }
 566
 567         if (flags & FCREAT)
 568                 (void) umask(old_umask);
 569
 570         if (vn_dumpdir != NULL) {
 571                 char *dumppath = umem_zalloc(MAXPATHLEN, UMEM_NOFAIL);
 572                 (void) snprintf(dumppath, MAXPATHLEN,
 573                     "%s/%s", vn_dumpdir, basename(realpath));
 574                 dump_fd = open64(dumppath, O_CREAT | O_WRONLY, 0666);
 575                 umem_free(dumppath, MAXPATHLEN);
 576                 if (dump_fd == -1) {
 577                         err = errno;
 578                         free(realpath);
 579                         close(fd);
 580                         return (err);
 581                 }
 582         } else {
 583                 dump_fd = -1;
 584         }
 585
 586         free(realpath);
 587
 588         if (fstat64_blk(fd, &st) == -1) {
 589                 err = errno;
 590                 close(fd);
 591                 if (dump_fd != -1)
 592                         close(dump_fd);
 593                 return (err);
 594         }
 595
 596         (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
 597
 598         *vpp = vp = umem_zalloc(sizeof (vnode_t), UMEM_NOFAIL);
 599
 600         vp->v_fd = fd;
 601         vp->v_size = st.st_size;
 602         vp->v_path = spa_strdup(path);
 603         vp->v_dump_fd = dump_fd;
 604
 605         return (0);
 606 }
 607
 608 /*ARGSUSED*/
 609 int
 610 vn_openat(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2,
 611     int x3, vnode_t *startvp, int fd)
 612 {
 613         char *realpath = umem_alloc(strlen(path) + 2, UMEM_NOFAIL);
 614         int ret;
 615
 616         ASSERT(startvp == rootdir);
 617         (void) sprintf(realpath, "/%s", path);
 618
 619         /* fd ignored for now, need if want to simulate nbmand support */
 620         ret = vn_open(realpath, x1, flags, mode, vpp, x2, x3);
 621
 622         umem_free(realpath, strlen(path) + 2);
 623
 624         return (ret);
 625 }
 626
 627 /*ARGSUSED*/
 628 int
 629 vn_rdwr(int uio, vnode_t *vp, void *addr, ssize_t len, offset_t offset,
 630     int x1, int x2, rlim64_t x3, void *x4, ssize_t *residp)
 631 {
 632         ssize_t rc, done = 0, split;
 633
 634         if (uio == UIO_READ) {
 635                 rc = pread64(vp->v_fd, addr, len, offset);
 636                 if (vp->v_dump_fd != -1 && rc != -1) {
 637                         int status;
 638                         status = pwrite64(vp->v_dump_fd, addr, rc, offset);
 639                         ASSERT(status != -1);
 640                 }
 641         } else {
 642                 /*
 643                  * To simulate partial disk writes, we split writes into two
 644                  * system calls so that the process can be killed in between.
 645                  */
 646                 int sectors = len >> SPA_MINBLOCKSHIFT;
 647                 split = (sectors > 0 ? rand() % sectors : 0) <<
 648                     SPA_MINBLOCKSHIFT;
 649                 rc = pwrite64(vp->v_fd, addr, split, offset);
 650                 if (rc != -1) {
 651                         done = rc;
 652                         rc = pwrite64(vp->v_fd, (char *)addr + split,
 653                             len - split, offset + split);
 654                 }
 655         }
 656
 657 #ifdef __linux__
 658         if (rc == -1 && errno == EINVAL) {
 659                 /*
 660                  * Under Linux, this most likely means an alignment issue
 661                  * (memory or disk) due to O_DIRECT, so we abort() in order to
 662                  * catch the offender.
 663                  */
 664                 abort();
 665         }
 666 #endif
 667         if (rc == -1)
 668                 return (errno);
 669
 670         done += rc;
 671
 672         if (residp)
 673                 *residp = len - done;
 674         else if (done != len)
 675                 return (EIO);
 676         return (0);
 677 }
 678
 679 void
 680 vn_close(vnode_t *vp)
 681 {
 682         close(vp->v_fd);
 683         if (vp->v_dump_fd != -1)
 684                 close(vp->v_dump_fd);
 685         spa_strfree(vp->v_path);
 686         umem_free(vp, sizeof (vnode_t));
 687 }
 688
 689 /*
 690  * At a minimum we need to update the size since vdev_reopen()
 691  * will no longer call vn_openat().
 692  */
 693 int
 694 fop_getattr(vnode_t *vp, vattr_t *vap)
 695 {
 696         struct stat64 st;
 697         int err;
 698
 699         if (fstat64_blk(vp->v_fd, &st) == -1) {
 700                 err = errno;
 701                 close(vp->v_fd);
 702                 return (err);
 703         }
 704
 705         vap->va_size = st.st_size;
 706         return (0);
 707 }
 708
 709 /*
 710  * =========================================================================
 711  * Figure out which debugging statements to print
 712  * =========================================================================
 713  */
 714
 715 static char *dprintf_string;
 716 static int dprintf_print_all;
 717
 718 int
 719 dprintf_find_string(const char *string)
 720 {
 721         char *tmp_str = dprintf_string;
 722         int len = strlen(string);
 723
 724         /*
 725          * Find out if this is a string we want to print.
 726          * String format: file1.c,function_name1,file2.c,file3.c
 727          */
 728
 729         while (tmp_str != NULL) {
 730                 if (strncmp(tmp_str, string, len) == 0 &&
 731                     (tmp_str[len] == ',' || tmp_str[len] == '\0'))
 732                         return (1);
 733                 tmp_str = strchr(tmp_str, ',');
 734                 if (tmp_str != NULL)
 735                         tmp_str++; /* Get rid of , */
 736         }
 737         return (0);
 738 }
 739
 740 void
 741 dprintf_setup(int *argc, char **argv)
 742 {
 743         int i, j;
 744
 745         /*
 746          * Debugging can be specified two ways: by setting the
 747          * environment variable ZFS_DEBUG, or by including a
 748          * "debug=..."  argument on the command line.  The command
 749          * line setting overrides the environment variable.
 750          */
 751
 752         for (i = 1; i < *argc; i++) {
 753                 int len = strlen("debug=");
 754                 /* First look for a command line argument */
 755                 if (strncmp("debug=", argv[i], len) == 0) {
 756                         dprintf_string = argv[i] + len;
 757                         /* Remove from args */
 758                         for (j = i; j < *argc; j++)
 759                                 argv[j] = argv[j+1];
 760                         argv[j] = NULL;
 761                         (*argc)--;
 762                 }
 763         }
 764
 765         if (dprintf_string == NULL) {
 766                 /* Look for ZFS_DEBUG environment variable */
 767                 dprintf_string = getenv("ZFS_DEBUG");
 768         }
 769
 770         /*
 771          * Are we just turning on all debugging?
 772          */
 773         if (dprintf_find_string("on"))
 774                 dprintf_print_all = 1;
 775
 776         if (dprintf_string != NULL)
 777                 zfs_flags |= ZFS_DEBUG_DPRINTF;
 778 }
 779
 780 /*
 781  * =========================================================================
 782  * debug printfs
 783  * =========================================================================
 784  */
 785 void
 786 __dprintf(const char *file, const char *func, int line, const char *fmt, ...)
 787 {
 788         const char *newfile;
 789         va_list adx;
 790
 791         /*
 792          * Get rid of annoying "../common/" prefix to filename.
 793          */
 794         newfile = strrchr(file, '/');
 795         if (newfile != NULL) {
 796                 newfile = newfile + 1; /* Get rid of leading / */
 797         } else {
 798                 newfile = file;
 799         }
 800
 801         if (dprintf_print_all ||
 802             dprintf_find_string(newfile) ||
 803             dprintf_find_string(func)) {
 804                 /* Print out just the function name if requested */
 805                 flockfile(stdout);
 806                 if (dprintf_find_string("pid"))
 807                         (void) printf("%d ", getpid());
 808                 if (dprintf_find_string("tid"))
 809                         (void) printf("%u ", (uint_t)pthread_self());
 810                 if (dprintf_find_string("cpu"))
 811                         (void) printf("%u ", getcpuid());
 812                 if (dprintf_find_string("time"))
 813                         (void) printf("%llu ", gethrtime());
 814                 if (dprintf_find_string("long"))
 815                         (void) printf("%s, line %d: ", newfile, line);
 816                 (void) printf("%s: ", func);
 817                 va_start(adx, fmt);
 818                 (void) vprintf(fmt, adx);
 819                 va_end(adx);
 820                 funlockfile(stdout);
 821         }
 822 }
 823
 824 /*
 825  * =========================================================================
 826  * cmn_err() and panic()
 827  * =========================================================================
 828  */
 829 static char ce_prefix[CE_IGNORE][10] = { "", "NOTICE: ", "WARNING: ", "" };
 830 static char ce_suffix[CE_IGNORE][2] = { "", "\n", "\n", "" };
 831
 832 void
 833 vpanic(const char *fmt, va_list adx)
 834 {
 835         (void) fprintf(stderr, "error: ");
 836         (void) vfprintf(stderr, fmt, adx);
 837         (void) fprintf(stderr, "\n");
 838
 839         abort();        /* think of it as a "user-level crash dump" */
 840 }
 841
 842 void
 843 panic(const char *fmt, ...)
 844 {
 845         va_list adx;
 846
 847         va_start(adx, fmt);
 848         vpanic(fmt, adx);
 849         va_end(adx);
 850 }
 851
 852 void
 853 vcmn_err(int ce, const char *fmt, va_list adx)
 854 {
 855         if (ce == CE_PANIC)
 856                 vpanic(fmt, adx);
 857         if (ce != CE_NOTE) {    /* suppress noise in userland stress testing */
 858                 (void) fprintf(stderr, "%s", ce_prefix[ce]);
 859                 (void) vfprintf(stderr, fmt, adx);
 860                 (void) fprintf(stderr, "%s", ce_suffix[ce]);
 861         }
 862 }
 863
 864 /*PRINTFLIKE2*/
 865 void
 866 cmn_err(int ce, const char *fmt, ...)
 867 {
 868         va_list adx;
 869
 870         va_start(adx, fmt);
 871         vcmn_err(ce, fmt, adx);
 872         va_end(adx);
 873 }
 874
 875 /*
 876  * =========================================================================
 877  * kobj interfaces
 878  * =========================================================================
 879  */
 880 struct _buf *
 881 kobj_open_file(char *name)
 882 {
 883         struct _buf *file;
 884         vnode_t *vp;
 885
 886         /* set vp as the _fd field of the file */
 887         if (vn_openat(name, UIO_SYSSPACE, FREAD, 0, &vp, 0, 0, rootdir,
 888             -1) != 0)
 889                 return ((void *)-1UL);
 890
 891         file = umem_zalloc(sizeof (struct _buf), UMEM_NOFAIL);
 892         file->_fd = (intptr_t)vp;
 893         return (file);
 894 }
 895
 896 int
 897 kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
 898 {
 899         ssize_t resid = 0;
 900
 901         if (vn_rdwr(UIO_READ, (vnode_t *)file->_fd, buf, size, (offset_t)off,
 902             UIO_SYSSPACE, 0, 0, 0, &resid) != 0)
 903                 return (-1);
 904
 905         return (size - resid);
 906 }
 907
 908 void
 909 kobj_close_file(struct _buf *file)
 910 {
 911         vn_close((vnode_t *)file->_fd);
 912         umem_free(file, sizeof (struct _buf));
 913 }
 914
 915 int
 916 kobj_get_filesize(struct _buf *file, uint64_t *size)
 917 {
 918         struct stat64 st;
 919         vnode_t *vp = (vnode_t *)file->_fd;
 920
 921         if (fstat64(vp->v_fd, &st) == -1) {
 922                 vn_close(vp);
 923                 return (errno);
 924         }
 925         *size = st.st_size;
 926         return (0);
 927 }
 928
 929 /*
 930  * =========================================================================
 931  * misc routines
 932  * =========================================================================
 933  */
 934
 935 void
 936 delay(clock_t ticks)
 937 {
 938         (void) poll(0, 0, ticks * (1000 / hz));
 939 }
 940
 941 /*
 942  * Find highest one bit set.
 943  * Returns bit number + 1 of highest bit that is set, otherwise returns 0.
 944  * The __builtin_clzll() function is supported by both GCC and Clang.
 945  */
 946 int
 947 highbit64(uint64_t i)
 948 {
 949         if (i == 0)
 950         return (0);
 951
 952         return (NBBY * sizeof (uint64_t) - __builtin_clzll(i));
 953 }
 954
 955 /*
 956  * Find lowest one bit set.
 957  * Returns bit number + 1 of lowest bit that is set, otherwise returns 0.
 958  * The __builtin_ffsll() function is supported by both GCC and Clang.
 959  */
 960 int
 961 lowbit64(uint64_t i)
 962 {
 963         if (i == 0)
 964                 return (0);
 965
 966         return (__builtin_ffsll(i));
 967 }
 968
 969 char *random_path = "/dev/random";
 970 char *urandom_path = "/dev/urandom";
 971 static int random_fd = -1, urandom_fd = -1;
 972
 973 void
 974 random_init(void)
 975 {
 976         VERIFY((random_fd = open(random_path, O_RDONLY)) != -1);
 977         VERIFY((urandom_fd = open(urandom_path, O_RDONLY)) != -1);
 978 }
 979
 980 void
 981 random_fini(void)
 982 {
 983         close(random_fd);
 984         close(urandom_fd);
 985
 986         random_fd = -1;
 987         urandom_fd = -1;
 988 }
 989
 990 static int
 991 random_get_bytes_common(uint8_t *ptr, size_t len, int fd)
 992 {
 993         size_t resid = len;
 994         ssize_t bytes;
 995
 996         ASSERT(fd != -1);
 997
 998         while (resid != 0) {
 999                 bytes = read(fd, ptr, resid);
1000                 ASSERT3S(bytes, >=, 0);
1001                 ptr += bytes;
1002                 resid -= bytes;
1003         }
1004
1005         return (0);
1006 }
1007
1008 int
1009 random_get_bytes(uint8_t *ptr, size_t len)
1010 {
1011         return (random_get_bytes_common(ptr, len, random_fd));
1012 }
1013
1014 int
1015 random_get_pseudo_bytes(uint8_t *ptr, size_t len)
1016 {
1017         return (random_get_bytes_common(ptr, len, urandom_fd));
1018 }
1019
1020 int
1021 ddi_strtoul(const char *hw_serial, char **nptr, int base, unsigned long *result)
1022 {
1023         char *end;
1024
1025         *result = strtoul(hw_serial, &end, base);
1026         if (*result == 0)
1027                 return (errno);
1028         return (0);
1029 }
1030
1031 int
1032 ddi_strtoull(const char *str, char **nptr, int base, u_longlong_t *result)
1033 {
1034         char *end;
1035
1036         *result = strtoull(str, &end, base);
1037         if (*result == 0)
1038                 return (errno);
1039         return (0);
1040 }
1041
1042 utsname_t *
1043 utsname(void)
1044 {
1045         return (&hw_utsname);
1046 }
1047
1048 /*
1049  * =========================================================================
1050  * kernel emulation setup & teardown
1051  * =========================================================================
1052  */
1053 static int
1054 umem_out_of_memory(void)
1055 {
1056         char errmsg[] = "out of memory -- generating core dump\n";
1057
1058         (void) fprintf(stderr, "%s", errmsg);
1059         abort();
1060         return (0);
1061 }
1062
1063 void
1064 kernel_init(int mode)
1065 {
1066         extern uint_t rrw_tsd_key;
1067
1068         umem_nofail_callback(umem_out_of_memory);
1069
1070         physmem = sysconf(_SC_PHYS_PAGES);
1071
1072         dprintf("physmem = %llu pages (%.2f GB)\n", physmem,
1073             (double)physmem * sysconf(_SC_PAGE_SIZE) / (1ULL << 30));
1074
1075         (void) snprintf(hw_serial, sizeof (hw_serial), "%ld",
1076             (mode & FWRITE) ? get_system_hostid() : 0);
1077
1078         random_init();
1079
1080         VERIFY0(uname(&hw_utsname));
1081
1082         system_taskq_init();
1083         icp_init();
1084
1085         spa_init(mode);
1086
1087         fletcher_4_init();
1088
1089         tsd_create(&rrw_tsd_key, rrw_tsd_destroy);
1090 }
1091
1092 void
1093 kernel_fini(void)
1094 {
1095         fletcher_4_fini();
1096         spa_fini();
1097
1098         icp_fini();
1099         system_taskq_fini();
1100
1101         random_fini();
1102 }
1103
1104 uid_t
1105 crgetuid(cred_t *cr)
1106 {
1107         return (0);
1108 }
1109
1110 uid_t
1111 crgetruid(cred_t *cr)
1112 {
1113         return (0);
1114 }
1115
1116 gid_t
1117 crgetgid(cred_t *cr)
1118 {
1119         return (0);
1120 }
1121
1122 int
1123 crgetngroups(cred_t *cr)
1124 {
1125         return (0);
1126 }
1127
1128 gid_t *
1129 crgetgroups(cred_t *cr)
1130 {
1131         return (NULL);
1132 }
1133
1134 int
1135 zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr)
1136 {
1137         return (0);
1138 }
1139
1140 int
1141 zfs_secpolicy_rename_perms(const char *from, const char *to, cred_t *cr)
1142 {
1143         return (0);
1144 }
1145
1146 int
1147 zfs_secpolicy_destroy_perms(const char *name, cred_t *cr)
1148 {
1149         return (0);
1150 }
1151
1152 int
1153 secpolicy_zfs(const cred_t *cr)
1154 {
1155         return (0);
1156 }
1157
1158 ksiddomain_t *
1159 ksid_lookupdomain(const char *dom)
1160 {
1161         ksiddomain_t *kd;
1162
1163         kd = umem_zalloc(sizeof (ksiddomain_t), UMEM_NOFAIL);
1164         kd->kd_name = spa_strdup(dom);
1165         return (kd);
1166 }
1167
1168 void
1169 ksiddomain_rele(ksiddomain_t *ksid)
1170 {
1171         spa_strfree(ksid->kd_name);
1172         umem_free(ksid, sizeof (ksiddomain_t));
1173 }
1174
1175 char *
1176 kmem_vasprintf(const char *fmt, va_list adx)
1177 {
1178         char *buf = NULL;
1179         va_list adx_copy;
1180
1181         va_copy(adx_copy, adx);
1182         VERIFY(vasprintf(&buf, fmt, adx_copy) != -1);
1183         va_end(adx_copy);
1184
1185         return (buf);
1186 }
1187
1188 char *
1189 kmem_asprintf(const char *fmt, ...)
1190 {
1191         char *buf = NULL;
1192         va_list adx;
1193
1194         va_start(adx, fmt);
1195         VERIFY(vasprintf(&buf, fmt, adx) != -1);
1196         va_end(adx);
1197
1198         return (buf);
1199 }
1200
1201 /* ARGSUSED */
1202 int
1203 zfs_onexit_fd_hold(int fd, minor_t *minorp)
1204 {
1205         *minorp = 0;
1206         return (0);
1207 }
1208
1209 /* ARGSUSED */
1210 void
1211 zfs_onexit_fd_rele(int fd)
1212 {
1213 }
1214
1215 /* ARGSUSED */
1216 int
1217 zfs_onexit_add_cb(minor_t minor, void (*func)(void *), void *data,
1218     uint64_t *action_handle)
1219 {
1220         return (0);
1221 }
1222
1223 /* ARGSUSED */
1224 int
1225 zfs_onexit_del_cb(minor_t minor, uint64_t action_handle, boolean_t fire)
1226 {
1227         return (0);
1228 }
1229
1230 /* ARGSUSED */
1231 int
1232 zfs_onexit_cb_data(minor_t minor, uint64_t action_handle, void **data)
1233 {
1234         return (0);
1235 }
1236
1237 fstrans_cookie_t
1238 spl_fstrans_mark(void)
1239 {
1240         return ((fstrans_cookie_t)0);
1241 }
1242
1243 void
1244 spl_fstrans_unmark(fstrans_cookie_t cookie)
1245 {
1246 }
1247
1248 int
1249 __spl_pf_fstrans_check(void)
1250 {
1251         return (0);
1252 }
1253
1254 void *zvol_tag = "zvol_tag";
1255
1256 void
1257 zvol_create_minors(spa_t *spa, const char *name, boolean_t async)
1258 {
1259 }
1260
1261 void
1262 zvol_remove_minor(spa_t *spa, const char *name, boolean_t async)
1263 {
1264 }
1265
1266 void
1267 zvol_remove_minors(spa_t *spa, const char *name, boolean_t async)
1268 {
1269 }
1270
1271 void
1272 zvol_rename_minors(spa_t *spa, const char *oldname, const char *newname,
1273     boolean_t async)
1274 {
1275 }