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) 2013 by Delphix. All rights reserved.
  24  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  25  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  26  */
  27 
  28 /*
  29  * The objective of this program is to provide a DMU/ZAP/SPA stress test
  30  * that runs entirely in userland, is easy to use, and easy to extend.
  31  *
  32  * The overall design of the ztest program is as follows:
  33  *
  34  * (1) For each major functional area (e.g. adding vdevs to a pool,
  35  *     creating and destroying datasets, reading and writing objects, etc)
  36  *     we have a simple routine to test that functionality.  These
  37  *     individual routines do not have to do anything "stressful".
  38  *
  39  * (2) We turn these simple functionality tests into a stress test by
  40  *     running them all in parallel, with as many threads as desired,
  41  *     and spread across as many datasets, objects, and vdevs as desired.
  42  *
  43  * (3) While all this is happening, we inject faults into the pool to
  44  *     verify that self-healing data really works.
  45  *
  46  * (4) Every time we open a dataset, we change its checksum and compression
  47  *     functions.  Thus even individual objects vary from block to block
  48  *     in which checksum they use and whether they're compressed.
  49  *
  50  * (5) To verify that we never lose on-disk consistency after a crash,
  51  *     we run the entire test in a child of the main process.
  52  *     At random times, the child self-immolates with a SIGKILL.
  53  *     This is the software equivalent of pulling the power cord.
  54  *     The parent then runs the test again, using the existing
  55  *     storage pool, as many times as desired. If backwards compatability
  56  *     testing is enabled ztest will sometimes run the "older" version
  57  *     of ztest after a SIGKILL.
  58  *
  59  * (6) To verify that we don't have future leaks or temporal incursions,
  60  *     many of the functional tests record the transaction group number
  61  *     as part of their data.  When reading old data, they verify that
  62  *     the transaction group number is less than the current, open txg.
  63  *     If you add a new test, please do this if applicable.
  64  *
  65  * When run with no arguments, ztest runs for about five minutes and
  66  * produces no output if successful.  To get a little bit of information,
  67  * specify -V.  To get more information, specify -VV, and so on.
  68  *
  69  * To turn this into an overnight stress test, use -T to specify run time.
  70  *
  71  * You can ask more more vdevs [-v], datasets [-d], or threads [-t]
  72  * to increase the pool capacity, fanout, and overall stress level.
  73  *
  74  * Use the -k option to set the desired frequency of kills.
  75  *
  76  * When ztest invokes itself it passes all relevant information through a
  77  * temporary file which is mmap-ed in the child process. This allows shared
  78  * memory to survive the exec syscall. The ztest_shared_hdr_t struct is always
  79  * stored at offset 0 of this file and contains information on the size and
  80  * number of shared structures in the file. The information stored in this file
  81  * must remain backwards compatible with older versions of ztest so that
  82  * ztest can invoke them during backwards compatibility testing (-B).
  83  */
  84 
  85 #include <sys/zfs_context.h>
  86 #include <sys/spa.h>
  87 #include <sys/dmu.h>
  88 #include <sys/txg.h>
  89 #include <sys/dbuf.h>
  90 #include <sys/zap.h>
  91 #include <sys/dmu_objset.h>
  92 #include <sys/poll.h>
  93 #include <sys/stat.h>
  94 #include <sys/time.h>
  95 #include <sys/wait.h>
  96 #include <sys/mman.h>
  97 #include <sys/resource.h>
  98 #include <sys/zio.h>
  99 #include <sys/zil.h>
 100 #include <sys/zil_impl.h>
 101 #include <sys/vdev_impl.h>
 102 #include <sys/vdev_file.h>
 103 #include <sys/spa_impl.h>
 104 #include <sys/metaslab_impl.h>
 105 #include <sys/dsl_prop.h>
 106 #include <sys/dsl_dataset.h>
 107 #include <sys/dsl_destroy.h>
 108 #include <sys/dsl_scan.h>
 109 #include <sys/zio_checksum.h>
 110 #include <sys/refcount.h>
 111 #include <sys/zfeature.h>
 112 #include <sys/dsl_userhold.h>
 113 #include <stdio.h>
 114 #include <stdio_ext.h>
 115 #include <stdlib.h>
 116 #include <unistd.h>
 117 #include <signal.h>
 118 #include <umem.h>
 119 #include <dlfcn.h>
 120 #include <ctype.h>
 121 #include <math.h>
 122 #include <sys/fs/zfs.h>
 123 #include <libnvpair.h>
 124 
 125 static int ztest_fd_data = -1;
 126 static int ztest_fd_rand = -1;
 127 
 128 typedef struct ztest_shared_hdr {
 129         uint64_t        zh_hdr_size;
 130         uint64_t        zh_opts_size;
 131         uint64_t        zh_size;
 132         uint64_t        zh_stats_size;
 133         uint64_t        zh_stats_count;
 134         uint64_t        zh_ds_size;
 135         uint64_t        zh_ds_count;
 136 } ztest_shared_hdr_t;
 137 
 138 static ztest_shared_hdr_t *ztest_shared_hdr;
 139 
 140 typedef struct ztest_shared_opts {
 141         char zo_pool[MAXNAMELEN];
 142         char zo_dir[MAXNAMELEN];
 143         char zo_alt_ztest[MAXNAMELEN];
 144         char zo_alt_libpath[MAXNAMELEN];
 145         uint64_t zo_vdevs;
 146         uint64_t zo_vdevtime;
 147         size_t zo_vdev_size;
 148         int zo_ashift;
 149         int zo_mirrors;
 150         int zo_raidz;
 151         int zo_raidz_parity;
 152         int zo_datasets;
 153         int zo_threads;
 154         uint64_t zo_passtime;
 155         uint64_t zo_killrate;
 156         int zo_verbose;
 157         int zo_init;
 158         uint64_t zo_time;
 159         uint64_t zo_maxloops;
 160         uint64_t zo_metaslab_gang_bang;
 161 } ztest_shared_opts_t;
 162 
 163 static const ztest_shared_opts_t ztest_opts_defaults = {
 164         .zo_pool = { 'z', 't', 'e', 's', 't', '\0' },
 165         .zo_dir = { '/', 't', 'm', 'p', '\0' },
 166         .zo_alt_ztest = { '\0' },
 167         .zo_alt_libpath = { '\0' },
 168         .zo_vdevs = 5,
 169         .zo_ashift = SPA_MINBLOCKSHIFT,
 170         .zo_mirrors = 2,
 171         .zo_raidz = 4,
 172         .zo_raidz_parity = 1,
 173         .zo_vdev_size = SPA_MINDEVSIZE,
 174         .zo_datasets = 7,
 175         .zo_threads = 23,
 176         .zo_passtime = 60,              /* 60 seconds */
 177         .zo_killrate = 70,              /* 70% kill rate */
 178         .zo_verbose = 0,
 179         .zo_init = 1,
 180         .zo_time = 300,                 /* 5 minutes */
 181         .zo_maxloops = 50,              /* max loops during spa_freeze() */
 182         .zo_metaslab_gang_bang = 32 << 10
 183 };
 184 
 185 extern uint64_t metaslab_gang_bang;
 186 extern uint64_t metaslab_df_alloc_threshold;
 187 extern uint64_t zfs_deadman_synctime;
 188 
 189 static ztest_shared_opts_t *ztest_shared_opts;
 190 static ztest_shared_opts_t ztest_opts;
 191 
 192 typedef struct ztest_shared_ds {
 193         uint64_t        zd_seq;
 194 } ztest_shared_ds_t;
 195 
 196 static ztest_shared_ds_t *ztest_shared_ds;
 197 #define ZTEST_GET_SHARED_DS(d) (&ztest_shared_ds[d])
 198 
 199 #define BT_MAGIC        0x123456789abcdefULL
 200 #define MAXFAULTS() \
 201         (MAX(zs->zs_mirrors, 1) * (ztest_opts.zo_raidz_parity + 1) - 1)
 202 
 203 enum ztest_io_type {
 204         ZTEST_IO_WRITE_TAG,
 205         ZTEST_IO_WRITE_PATTERN,
 206         ZTEST_IO_WRITE_ZEROES,
 207         ZTEST_IO_TRUNCATE,
 208         ZTEST_IO_SETATTR,
 209         ZTEST_IO_REWRITE,
 210         ZTEST_IO_TYPES
 211 };
 212 
 213 typedef struct ztest_block_tag {
 214         uint64_t        bt_magic;
 215         uint64_t        bt_objset;
 216         uint64_t        bt_object;
 217         uint64_t        bt_offset;
 218         uint64_t        bt_gen;
 219         uint64_t        bt_txg;
 220         uint64_t        bt_crtxg;
 221 } ztest_block_tag_t;
 222 
 223 typedef struct bufwad {
 224         uint64_t        bw_index;
 225         uint64_t        bw_txg;
 226         uint64_t        bw_data;
 227 } bufwad_t;
 228 
 229 /*
 230  * XXX -- fix zfs range locks to be generic so we can use them here.
 231  */
 232 typedef enum {
 233         RL_READER,
 234         RL_WRITER,
 235         RL_APPEND
 236 } rl_type_t;
 237 
 238 typedef struct rll {
 239         void            *rll_writer;
 240         int             rll_readers;
 241         mutex_t         rll_lock;
 242         cond_t          rll_cv;
 243 } rll_t;
 244 
 245 typedef struct rl {
 246         uint64_t        rl_object;
 247         uint64_t        rl_offset;
 248         uint64_t        rl_size;
 249         rll_t           *rl_lock;
 250 } rl_t;
 251 
 252 #define ZTEST_RANGE_LOCKS       64
 253 #define ZTEST_OBJECT_LOCKS      64
 254 
 255 /*
 256  * Object descriptor.  Used as a template for object lookup/create/remove.
 257  */
 258 typedef struct ztest_od {
 259         uint64_t        od_dir;
 260         uint64_t        od_object;
 261         dmu_object_type_t od_type;
 262         dmu_object_type_t od_crtype;
 263         uint64_t        od_blocksize;
 264         uint64_t        od_crblocksize;
 265         uint64_t        od_gen;
 266         uint64_t        od_crgen;
 267         char            od_name[MAXNAMELEN];
 268 } ztest_od_t;
 269 
 270 /*
 271  * Per-dataset state.
 272  */
 273 typedef struct ztest_ds {
 274         ztest_shared_ds_t *zd_shared;
 275         objset_t        *zd_os;
 276         rwlock_t        zd_zilog_lock;
 277         zilog_t         *zd_zilog;
 278         ztest_od_t      *zd_od;         /* debugging aid */
 279         char            zd_name[MAXNAMELEN];
 280         mutex_t         zd_dirobj_lock;
 281         rll_t           zd_object_lock[ZTEST_OBJECT_LOCKS];
 282         rll_t           zd_range_lock[ZTEST_RANGE_LOCKS];
 283 } ztest_ds_t;
 284 
 285 /*
 286  * Per-iteration state.
 287  */
 288 typedef void ztest_func_t(ztest_ds_t *zd, uint64_t id);
 289 
 290 typedef struct ztest_info {
 291         ztest_func_t    *zi_func;       /* test function */
 292         uint64_t        zi_iters;       /* iterations per execution */
 293         uint64_t        *zi_interval;   /* execute every <interval> seconds */
 294 } ztest_info_t;
 295 
 296 typedef struct ztest_shared_callstate {
 297         uint64_t        zc_count;       /* per-pass count */
 298         uint64_t        zc_time;        /* per-pass time */
 299         uint64_t        zc_next;        /* next time to call this function */
 300 } ztest_shared_callstate_t;
 301 
 302 static ztest_shared_callstate_t *ztest_shared_callstate;
 303 #define ZTEST_GET_SHARED_CALLSTATE(c) (&ztest_shared_callstate[c])
 304 
 305 /*
 306  * Note: these aren't static because we want dladdr() to work.
 307  */
 308 ztest_func_t ztest_dmu_read_write;
 309 ztest_func_t ztest_dmu_write_parallel;
 310 ztest_func_t ztest_dmu_object_alloc_free;
 311 ztest_func_t ztest_dmu_commit_callbacks;
 312 ztest_func_t ztest_zap;
 313 ztest_func_t ztest_zap_parallel;
 314 ztest_func_t ztest_zil_commit;
 315 ztest_func_t ztest_zil_remount;
 316 ztest_func_t ztest_dmu_read_write_zcopy;
 317 ztest_func_t ztest_dmu_objset_create_destroy;
 318 ztest_func_t ztest_dmu_prealloc;
 319 ztest_func_t ztest_fzap;
 320 ztest_func_t ztest_dmu_snapshot_create_destroy;
 321 ztest_func_t ztest_dsl_prop_get_set;
 322 ztest_func_t ztest_spa_prop_get_set;
 323 ztest_func_t ztest_spa_create_destroy;
 324 ztest_func_t ztest_fault_inject;
 325 ztest_func_t ztest_ddt_repair;
 326 ztest_func_t ztest_dmu_snapshot_hold;
 327 ztest_func_t ztest_spa_rename;
 328 ztest_func_t ztest_scrub;
 329 ztest_func_t ztest_dsl_dataset_promote_busy;
 330 ztest_func_t ztest_vdev_attach_detach;
 331 ztest_func_t ztest_vdev_LUN_growth;
 332 ztest_func_t ztest_vdev_add_remove;
 333 ztest_func_t ztest_vdev_aux_add_remove;
 334 ztest_func_t ztest_split_pool;
 335 ztest_func_t ztest_reguid;
 336 ztest_func_t ztest_spa_upgrade;
 337 
 338 uint64_t zopt_always = 0ULL * NANOSEC;          /* all the time */
 339 uint64_t zopt_incessant = 1ULL * NANOSEC / 10;  /* every 1/10 second */
 340 uint64_t zopt_often = 1ULL * NANOSEC;           /* every second */
 341 uint64_t zopt_sometimes = 10ULL * NANOSEC;      /* every 10 seconds */
 342 uint64_t zopt_rarely = 60ULL * NANOSEC;         /* every 60 seconds */
 343 
 344 ztest_info_t ztest_info[] = {
 345         { ztest_dmu_read_write,                 1,      &zopt_always        },
 346         { ztest_dmu_write_parallel,             10,     &zopt_always        },
 347         { ztest_dmu_object_alloc_free,          1,      &zopt_always        },
 348         { ztest_dmu_commit_callbacks,           1,      &zopt_always        },
 349         { ztest_zap,                            30,     &zopt_always        },
 350         { ztest_zap_parallel,                   100,    &zopt_always        },
 351         { ztest_split_pool,                     1,      &zopt_always        },
 352         { ztest_zil_commit,                     1,      &zopt_incessant     },
 353         { ztest_zil_remount,                    1,      &zopt_sometimes     },
 354         { ztest_dmu_read_write_zcopy,           1,      &zopt_often },
 355         { ztest_dmu_objset_create_destroy,      1,      &zopt_often },
 356         { ztest_dsl_prop_get_set,               1,      &zopt_often },
 357         { ztest_spa_prop_get_set,               1,      &zopt_sometimes     },
 358 #if 0
 359         { ztest_dmu_prealloc,                   1,      &zopt_sometimes     },
 360 #endif
 361         { ztest_fzap,                           1,      &zopt_sometimes     },
 362         { ztest_dmu_snapshot_create_destroy,    1,      &zopt_sometimes     },
 363         { ztest_spa_create_destroy,             1,      &zopt_sometimes     },
 364         { ztest_fault_inject,                   1,      &zopt_sometimes     },
 365         { ztest_ddt_repair,                     1,      &zopt_sometimes     },
 366         { ztest_dmu_snapshot_hold,              1,      &zopt_sometimes     },
 367         { ztest_reguid,                         1,      &zopt_rarely        },
 368         { ztest_spa_rename,                     1,      &zopt_rarely        },
 369         { ztest_scrub,                          1,      &zopt_rarely        },
 370         { ztest_spa_upgrade,                    1,      &zopt_rarely        },
 371         { ztest_dsl_dataset_promote_busy,       1,      &zopt_rarely        },
 372         { ztest_vdev_attach_detach,             1,      &zopt_sometimes     },
 373         { ztest_vdev_LUN_growth,                1,      &zopt_rarely        },
 374         { ztest_vdev_add_remove,                1,
 375             &ztest_opts.zo_vdevtime                         },
 376         { ztest_vdev_aux_add_remove,            1,
 377             &ztest_opts.zo_vdevtime                         },
 378 };
 379 
 380 #define ZTEST_FUNCS     (sizeof (ztest_info) / sizeof (ztest_info_t))
 381 
 382 /*
 383  * The following struct is used to hold a list of uncalled commit callbacks.
 384  * The callbacks are ordered by txg number.
 385  */
 386 typedef struct ztest_cb_list {
 387         mutex_t zcl_callbacks_lock;
 388         list_t  zcl_callbacks;
 389 } ztest_cb_list_t;
 390 
 391 /*
 392  * Stuff we need to share writably between parent and child.
 393  */
 394 typedef struct ztest_shared {
 395         boolean_t       zs_do_init;
 396         hrtime_t        zs_proc_start;
 397         hrtime_t        zs_proc_stop;
 398         hrtime_t        zs_thread_start;
 399         hrtime_t        zs_thread_stop;
 400         hrtime_t        zs_thread_kill;
 401         uint64_t        zs_enospc_count;
 402         uint64_t        zs_vdev_next_leaf;
 403         uint64_t        zs_vdev_aux;
 404         uint64_t        zs_alloc;
 405         uint64_t        zs_space;
 406         uint64_t        zs_splits;
 407         uint64_t        zs_mirrors;
 408         uint64_t        zs_metaslab_sz;
 409         uint64_t        zs_metaslab_df_alloc_threshold;
 410         uint64_t        zs_guid;
 411 } ztest_shared_t;
 412 
 413 #define ID_PARALLEL     -1ULL
 414 
 415 static char ztest_dev_template[] = "%s/%s.%llua";
 416 static char ztest_aux_template[] = "%s/%s.%s.%llu";
 417 ztest_shared_t *ztest_shared;
 418 
 419 static spa_t *ztest_spa = NULL;
 420 static ztest_ds_t *ztest_ds;
 421 
 422 static mutex_t ztest_vdev_lock;
 423 
 424 /*
 425  * The ztest_name_lock protects the pool and dataset namespace used by
 426  * the individual tests. To modify the namespace, consumers must grab
 427  * this lock as writer. Grabbing the lock as reader will ensure that the
 428  * namespace does not change while the lock is held.
 429  */
 430 static rwlock_t ztest_name_lock;
 431 
 432 static boolean_t ztest_dump_core = B_TRUE;
 433 static boolean_t ztest_exiting;
 434 
 435 /* Global commit callback list */
 436 static ztest_cb_list_t zcl;
 437 
 438 enum ztest_object {
 439         ZTEST_META_DNODE = 0,
 440         ZTEST_DIROBJ,
 441         ZTEST_OBJECTS
 442 };
 443 
 444 static void usage(boolean_t) __NORETURN;
 445 
 446 /*
 447  * These libumem hooks provide a reasonable set of defaults for the allocator's
 448  * debugging facilities.
 449  */
 450 const char *
 451 _umem_debug_init()
 452 {
 453         return ("default,verbose"); /* $UMEM_DEBUG setting */
 454 }
 455 
 456 const char *
 457 _umem_logging_init(void)
 458 {
 459         return ("fail,contents"); /* $UMEM_LOGGING setting */
 460 }
 461 
 462 #define FATAL_MSG_SZ    1024
 463 
 464 char *fatal_msg;
 465 
 466 static void
 467 fatal(int do_perror, char *message, ...)
 468 {
 469         va_list args;
 470         int save_errno = errno;
 471         char buf[FATAL_MSG_SZ];
 472 
 473         (void) fflush(stdout);
 474 
 475         va_start(args, message);
 476         (void) sprintf(buf, "ztest: ");
 477         /* LINTED */
 478         (void) vsprintf(buf + strlen(buf), message, args);
 479         va_end(args);
 480         if (do_perror) {
 481                 (void) snprintf(buf + strlen(buf), FATAL_MSG_SZ - strlen(buf),
 482                     ": %s", strerror(save_errno));
 483         }
 484         (void) fprintf(stderr, "%s\n", buf);
 485         fatal_msg = buf;                        /* to ease debugging */
 486         if (ztest_dump_core)
 487                 abort();
 488         exit(3);
 489 }
 490 
 491 static int
 492 str2shift(const char *buf)
 493 {
 494         const char *ends = "BKMGTPEZ";
 495         int i;
 496 
 497         if (buf[0] == '\0')
 498                 return (0);
 499         for (i = 0; i < strlen(ends); i++) {
 500                 if (toupper(buf[0]) == ends[i])
 501                         break;
 502         }
 503         if (i == strlen(ends)) {
 504                 (void) fprintf(stderr, "ztest: invalid bytes suffix: %s\n",
 505                     buf);
 506                 usage(B_FALSE);
 507         }
 508         if (buf[1] == '\0' || (toupper(buf[1]) == 'B' && buf[2] == '\0')) {
 509                 return (10*i);
 510         }
 511         (void) fprintf(stderr, "ztest: invalid bytes suffix: %s\n", buf);
 512         usage(B_FALSE);
 513         /* NOTREACHED */
 514 }
 515 
 516 static uint64_t
 517 nicenumtoull(const char *buf)
 518 {
 519         char *end;
 520         uint64_t val;
 521 
 522         val = strtoull(buf, &end, 0);
 523         if (end == buf) {
 524                 (void) fprintf(stderr, "ztest: bad numeric value: %s\n", buf);
 525                 usage(B_FALSE);
 526         } else if (end[0] == '.') {
 527                 double fval = strtod(buf, &end);
 528                 fval *= pow(2, str2shift(end));
 529                 if (fval > UINT64_MAX) {
 530                         (void) fprintf(stderr, "ztest: value too large: %s\n",
 531                             buf);
 532                         usage(B_FALSE);
 533                 }
 534                 val = (uint64_t)fval;
 535         } else {
 536                 int shift = str2shift(end);
 537                 if (shift >= 64 || (val << shift) >> shift != val) {
 538                         (void) fprintf(stderr, "ztest: value too large: %s\n",
 539                             buf);
 540                         usage(B_FALSE);
 541                 }
 542                 val <<= shift;
 543         }
 544         return (val);
 545 }
 546 
 547 static void
 548 usage(boolean_t requested)
 549 {
 550         const ztest_shared_opts_t *zo = &ztest_opts_defaults;
 551 
 552         char nice_vdev_size[10];
 553         char nice_gang_bang[10];
 554         FILE *fp = requested ? stdout : stderr;
 555 
 556         nicenum(zo->zo_vdev_size, nice_vdev_size);
 557         nicenum(zo->zo_metaslab_gang_bang, nice_gang_bang);
 558 
 559         (void) fprintf(fp, "Usage: %s\n"
 560             "\t[-v vdevs (default: %llu)]\n"
 561             "\t[-s size_of_each_vdev (default: %s)]\n"
 562             "\t[-a alignment_shift (default: %d)] use 0 for random\n"
 563             "\t[-m mirror_copies (default: %d)]\n"
 564             "\t[-r raidz_disks (default: %d)]\n"
 565             "\t[-R raidz_parity (default: %d)]\n"
 566             "\t[-d datasets (default: %d)]\n"
 567             "\t[-t threads (default: %d)]\n"
 568             "\t[-g gang_block_threshold (default: %s)]\n"
 569             "\t[-i init_count (default: %d)] initialize pool i times\n"
 570             "\t[-k kill_percentage (default: %llu%%)]\n"
 571             "\t[-p pool_name (default: %s)]\n"
 572             "\t[-f dir (default: %s)] file directory for vdev files\n"
 573             "\t[-V] verbose (use multiple times for ever more blather)\n"
 574             "\t[-E] use existing pool instead of creating new one\n"
 575             "\t[-T time (default: %llu sec)] total run time\n"
 576             "\t[-F freezeloops (default: %llu)] max loops in spa_freeze()\n"
 577             "\t[-P passtime (default: %llu sec)] time per pass\n"
 578             "\t[-B alt_ztest (default: <none>)] alternate ztest path\n"
 579             "\t[-h] (print help)\n"
 580             "",
 581             zo->zo_pool,
 582             (u_longlong_t)zo->zo_vdevs,                      /* -v */
 583             nice_vdev_size,                             /* -s */
 584             zo->zo_ashift,                           /* -a */
 585             zo->zo_mirrors,                          /* -m */
 586             zo->zo_raidz,                            /* -r */
 587             zo->zo_raidz_parity,                     /* -R */
 588             zo->zo_datasets,                         /* -d */
 589             zo->zo_threads,                          /* -t */
 590             nice_gang_bang,                             /* -g */
 591             zo->zo_init,                             /* -i */
 592             (u_longlong_t)zo->zo_killrate,           /* -k */
 593             zo->zo_pool,                             /* -p */
 594             zo->zo_dir,                                      /* -f */
 595             (u_longlong_t)zo->zo_time,                       /* -T */
 596             (u_longlong_t)zo->zo_maxloops,           /* -F */
 597             (u_longlong_t)zo->zo_passtime);
 598         exit(requested ? 0 : 1);
 599 }
 600 
 601 static void
 602 process_options(int argc, char **argv)
 603 {
 604         char *path;
 605         ztest_shared_opts_t *zo = &ztest_opts;
 606 
 607         int opt;
 608         uint64_t value;
 609         char altdir[MAXNAMELEN] = { 0 };
 610 
 611         bcopy(&ztest_opts_defaults, zo, sizeof (*zo));
 612 
 613         while ((opt = getopt(argc, argv,
 614             "v:s:a:m:r:R:d:t:g:i:k:p:f:VET:P:hF:B:")) != EOF) {
 615                 value = 0;
 616                 switch (opt) {
 617                 case 'v':
 618                 case 's':
 619                 case 'a':
 620                 case 'm':
 621                 case 'r':
 622                 case 'R':
 623                 case 'd':
 624                 case 't':
 625                 case 'g':
 626                 case 'i':
 627                 case 'k':
 628                 case 'T':
 629                 case 'P':
 630                 case 'F':
 631                         value = nicenumtoull(optarg);
 632                 }
 633                 switch (opt) {
 634                 case 'v':
 635                         zo->zo_vdevs = value;
 636                         break;
 637                 case 's':
 638                         zo->zo_vdev_size = MAX(SPA_MINDEVSIZE, value);
 639                         break;
 640                 case 'a':
 641                         zo->zo_ashift = value;
 642                         break;
 643                 case 'm':
 644                         zo->zo_mirrors = value;
 645                         break;
 646                 case 'r':
 647                         zo->zo_raidz = MAX(1, value);
 648                         break;
 649                 case 'R':
 650                         zo->zo_raidz_parity = MIN(MAX(value, 1), 3);
 651                         break;
 652                 case 'd':
 653                         zo->zo_datasets = MAX(1, value);
 654                         break;
 655                 case 't':
 656                         zo->zo_threads = MAX(1, value);
 657                         break;
 658                 case 'g':
 659                         zo->zo_metaslab_gang_bang = MAX(SPA_MINBLOCKSIZE << 1,
 660                             value);
 661                         break;
 662                 case 'i':
 663                         zo->zo_init = value;
 664                         break;
 665                 case 'k':
 666                         zo->zo_killrate = value;
 667                         break;
 668                 case 'p':
 669                         (void) strlcpy(zo->zo_pool, optarg,
 670                             sizeof (zo->zo_pool));
 671                         break;
 672                 case 'f':
 673                         path = realpath(optarg, NULL);
 674                         if (path == NULL) {
 675                                 (void) fprintf(stderr, "error: %s: %s\n",
 676                                     optarg, strerror(errno));
 677                                 usage(B_FALSE);
 678                         } else {
 679                                 (void) strlcpy(zo->zo_dir, path,
 680                                     sizeof (zo->zo_dir));
 681                         }
 682                         break;
 683                 case 'V':
 684                         zo->zo_verbose++;
 685                         break;
 686                 case 'E':
 687                         zo->zo_init = 0;
 688                         break;
 689                 case 'T':
 690                         zo->zo_time = value;
 691                         break;
 692                 case 'P':
 693                         zo->zo_passtime = MAX(1, value);
 694                         break;
 695                 case 'F':
 696                         zo->zo_maxloops = MAX(1, value);
 697                         break;
 698                 case 'B':
 699                         (void) strlcpy(altdir, optarg, sizeof (altdir));
 700                         break;
 701                 case 'h':
 702                         usage(B_TRUE);
 703                         break;
 704                 case '?':
 705                 default:
 706                         usage(B_FALSE);
 707                         break;
 708                 }
 709         }
 710 
 711         zo->zo_raidz_parity = MIN(zo->zo_raidz_parity, zo->zo_raidz - 1);
 712 
 713         zo->zo_vdevtime =
 714             (zo->zo_vdevs > 0 ? zo->zo_time * NANOSEC / zo->zo_vdevs :
 715             UINT64_MAX >> 2);
 716 
 717         if (strlen(altdir) > 0) {
 718                 char *cmd;
 719                 char *realaltdir;
 720                 char *bin;
 721                 char *ztest;
 722                 char *isa;
 723                 int isalen;
 724 
 725                 cmd = umem_alloc(MAXPATHLEN, UMEM_NOFAIL);
 726                 realaltdir = umem_alloc(MAXPATHLEN, UMEM_NOFAIL);
 727 
 728                 VERIFY(NULL != realpath(getexecname(), cmd));
 729                 if (0 != access(altdir, F_OK)) {
 730                         ztest_dump_core = B_FALSE;
 731                         fatal(B_TRUE, "invalid alternate ztest path: %s",
 732                             altdir);
 733                 }
 734                 VERIFY(NULL != realpath(altdir, realaltdir));
 735 
 736                 /*
 737                  * 'cmd' should be of the form "<anything>/usr/bin/<isa>/ztest".
 738                  * We want to extract <isa> to determine if we should use
 739                  * 32 or 64 bit binaries.
 740                  */
 741                 bin = strstr(cmd, "/usr/bin/");
 742                 ztest = strstr(bin, "/ztest");
 743                 isa = bin + 9;
 744                 isalen = ztest - isa;
 745                 (void) snprintf(zo->zo_alt_ztest, sizeof (zo->zo_alt_ztest),
 746                     "%s/usr/bin/%.*s/ztest", realaltdir, isalen, isa);
 747                 (void) snprintf(zo->zo_alt_libpath, sizeof (zo->zo_alt_libpath),
 748                     "%s/usr/lib/%.*s", realaltdir, isalen, isa);
 749 
 750                 if (0 != access(zo->zo_alt_ztest, X_OK)) {
 751                         ztest_dump_core = B_FALSE;
 752                         fatal(B_TRUE, "invalid alternate ztest: %s",
 753                             zo->zo_alt_ztest);
 754                 } else if (0 != access(zo->zo_alt_libpath, X_OK)) {
 755                         ztest_dump_core = B_FALSE;
 756                         fatal(B_TRUE, "invalid alternate lib directory %s",
 757                             zo->zo_alt_libpath);
 758                 }
 759 
 760                 umem_free(cmd, MAXPATHLEN);
 761                 umem_free(realaltdir, MAXPATHLEN);
 762         }
 763 }
 764 
 765 static void
 766 ztest_kill(ztest_shared_t *zs)
 767 {
 768         zs->zs_alloc = metaslab_class_get_alloc(spa_normal_class(ztest_spa));
 769         zs->zs_space = metaslab_class_get_space(spa_normal_class(ztest_spa));
 770 
 771         /*
 772          * Before we kill off ztest, make sure that the config is updated.
 773          * See comment above spa_config_sync().
 774          */
 775         mutex_enter(&spa_namespace_lock);
 776         spa_config_sync(ztest_spa, B_FALSE, B_FALSE);
 777         mutex_exit(&spa_namespace_lock);
 778 
 779         zfs_dbgmsg_print(FTAG);
 780         (void) kill(getpid(), SIGKILL);
 781 }
 782 
 783 static uint64_t
 784 ztest_random(uint64_t range)
 785 {
 786         uint64_t r;
 787 
 788         ASSERT3S(ztest_fd_rand, >=, 0);
 789 
 790         if (range == 0)
 791                 return (0);
 792 
 793         if (read(ztest_fd_rand, &r, sizeof (r)) != sizeof (r))
 794                 fatal(1, "short read from /dev/urandom");
 795 
 796         return (r % range);
 797 }
 798 
 799 /* ARGSUSED */
 800 static void
 801 ztest_record_enospc(const char *s)
 802 {
 803         ztest_shared->zs_enospc_count++;
 804 }
 805 
 806 static uint64_t
 807 ztest_get_ashift(void)
 808 {
 809         if (ztest_opts.zo_ashift == 0)
 810                 return (SPA_MINBLOCKSHIFT + ztest_random(3));
 811         return (ztest_opts.zo_ashift);
 812 }
 813 
 814 static nvlist_t *
 815 make_vdev_file(char *path, char *aux, char *pool, size_t size, uint64_t ashift)
 816 {
 817         char pathbuf[MAXPATHLEN];
 818         uint64_t vdev;
 819         nvlist_t *file;
 820 
 821         if (ashift == 0)
 822                 ashift = ztest_get_ashift();
 823 
 824         if (path == NULL) {
 825                 path = pathbuf;
 826 
 827                 if (aux != NULL) {
 828                         vdev = ztest_shared->zs_vdev_aux;
 829                         (void) snprintf(path, sizeof (pathbuf),
 830                             ztest_aux_template, ztest_opts.zo_dir,
 831                             pool == NULL ? ztest_opts.zo_pool : pool,
 832                             aux, vdev);
 833                 } else {
 834                         vdev = ztest_shared->zs_vdev_next_leaf++;
 835                         (void) snprintf(path, sizeof (pathbuf),
 836                             ztest_dev_template, ztest_opts.zo_dir,
 837                             pool == NULL ? ztest_opts.zo_pool : pool, vdev);
 838                 }
 839         }
 840 
 841         if (size != 0) {
 842                 int fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0666);
 843                 if (fd == -1)
 844                         fatal(1, "can't open %s", path);
 845                 if (ftruncate(fd, size) != 0)
 846                         fatal(1, "can't ftruncate %s", path);
 847                 (void) close(fd);
 848         }
 849 
 850         VERIFY(nvlist_alloc(&file, NV_UNIQUE_NAME, 0) == 0);
 851         VERIFY(nvlist_add_string(file, ZPOOL_CONFIG_TYPE, VDEV_TYPE_FILE) == 0);
 852         VERIFY(nvlist_add_string(file, ZPOOL_CONFIG_PATH, path) == 0);
 853         VERIFY(nvlist_add_uint64(file, ZPOOL_CONFIG_ASHIFT, ashift) == 0);
 854 
 855         return (file);
 856 }
 857 
 858 static nvlist_t *
 859 make_vdev_raidz(char *path, char *aux, char *pool, size_t size,
 860     uint64_t ashift, int r)
 861 {
 862         nvlist_t *raidz, **child;
 863         int c;
 864 
 865         if (r < 2)
 866                 return (make_vdev_file(path, aux, pool, size, ashift));
 867         child = umem_alloc(r * sizeof (nvlist_t *), UMEM_NOFAIL);
 868 
 869         for (c = 0; c < r; c++)
 870                 child[c] = make_vdev_file(path, aux, pool, size, ashift);
 871 
 872         VERIFY(nvlist_alloc(&raidz, NV_UNIQUE_NAME, 0) == 0);
 873         VERIFY(nvlist_add_string(raidz, ZPOOL_CONFIG_TYPE,
 874             VDEV_TYPE_RAIDZ) == 0);
 875         VERIFY(nvlist_add_uint64(raidz, ZPOOL_CONFIG_NPARITY,
 876             ztest_opts.zo_raidz_parity) == 0);
 877         VERIFY(nvlist_add_nvlist_array(raidz, ZPOOL_CONFIG_CHILDREN,
 878             child, r) == 0);
 879 
 880         for (c = 0; c < r; c++)
 881                 nvlist_free(child[c]);
 882 
 883         umem_free(child, r * sizeof (nvlist_t *));
 884 
 885         return (raidz);
 886 }
 887 
 888 static nvlist_t *
 889 make_vdev_mirror(char *path, char *aux, char *pool, size_t size,
 890     uint64_t ashift, int r, int m)
 891 {
 892         nvlist_t *mirror, **child;
 893         int c;
 894 
 895         if (m < 1)
 896                 return (make_vdev_raidz(path, aux, pool, size, ashift, r));
 897 
 898         child = umem_alloc(m * sizeof (nvlist_t *), UMEM_NOFAIL);
 899 
 900         for (c = 0; c < m; c++)
 901                 child[c] = make_vdev_raidz(path, aux, pool, size, ashift, r);
 902 
 903         VERIFY(nvlist_alloc(&mirror, NV_UNIQUE_NAME, 0) == 0);
 904         VERIFY(nvlist_add_string(mirror, ZPOOL_CONFIG_TYPE,
 905             VDEV_TYPE_MIRROR) == 0);
 906         VERIFY(nvlist_add_nvlist_array(mirror, ZPOOL_CONFIG_CHILDREN,
 907             child, m) == 0);
 908 
 909         for (c = 0; c < m; c++)
 910                 nvlist_free(child[c]);
 911 
 912         umem_free(child, m * sizeof (nvlist_t *));
 913 
 914         return (mirror);
 915 }
 916 
 917 static nvlist_t *
 918 make_vdev_root(char *path, char *aux, char *pool, size_t size, uint64_t ashift,
 919     int log, int r, int m, int t)
 920 {
 921         nvlist_t *root, **child;
 922         int c;
 923 
 924         ASSERT(t > 0);
 925 
 926         child = umem_alloc(t * sizeof (nvlist_t *), UMEM_NOFAIL);
 927 
 928         for (c = 0; c < t; c++) {
 929                 child[c] = make_vdev_mirror(path, aux, pool, size, ashift,
 930                     r, m);
 931                 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
 932                     log) == 0);
 933         }
 934 
 935         VERIFY(nvlist_alloc(&root, NV_UNIQUE_NAME, 0) == 0);
 936         VERIFY(nvlist_add_string(root, ZPOOL_CONFIG_TYPE, VDEV_TYPE_ROOT) == 0);
 937         VERIFY(nvlist_add_nvlist_array(root, aux ? aux : ZPOOL_CONFIG_CHILDREN,
 938             child, t) == 0);
 939 
 940         for (c = 0; c < t; c++)
 941                 nvlist_free(child[c]);
 942 
 943         umem_free(child, t * sizeof (nvlist_t *));
 944 
 945         return (root);
 946 }
 947 
 948 /*
 949  * Find a random spa version. Returns back a random spa version in the
 950  * range [initial_version, SPA_VERSION_FEATURES].
 951  */
 952 static uint64_t
 953 ztest_random_spa_version(uint64_t initial_version)
 954 {
 955         uint64_t version = initial_version;
 956 
 957         if (version <= SPA_VERSION_BEFORE_FEATURES) {
 958                 version = version +
 959                     ztest_random(SPA_VERSION_BEFORE_FEATURES - version + 1);
 960         }
 961 
 962         if (version > SPA_VERSION_BEFORE_FEATURES)
 963                 version = SPA_VERSION_FEATURES;
 964 
 965         ASSERT(SPA_VERSION_IS_SUPPORTED(version));
 966         return (version);
 967 }
 968 
 969 static int
 970 ztest_random_blocksize(void)
 971 {
 972         return (1 << (SPA_MINBLOCKSHIFT +
 973             ztest_random(SPA_MAXBLOCKSHIFT - SPA_MINBLOCKSHIFT + 1)));
 974 }
 975 
 976 static int
 977 ztest_random_ibshift(void)
 978 {
 979         return (DN_MIN_INDBLKSHIFT +
 980             ztest_random(DN_MAX_INDBLKSHIFT - DN_MIN_INDBLKSHIFT + 1));
 981 }
 982 
 983 static uint64_t
 984 ztest_random_vdev_top(spa_t *spa, boolean_t log_ok)
 985 {
 986         uint64_t top;
 987         vdev_t *rvd = spa->spa_root_vdev;
 988         vdev_t *tvd;
 989 
 990         ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
 991 
 992         do {
 993                 top = ztest_random(rvd->vdev_children);
 994                 tvd = rvd->vdev_child[top];
 995         } while (tvd->vdev_ishole || (tvd->vdev_islog && !log_ok) ||
 996             tvd->vdev_mg == NULL || tvd->vdev_mg->mg_class == NULL);
 997 
 998         return (top);
 999 }
1000 
1001 static uint64_t
1002 ztest_random_dsl_prop(zfs_prop_t prop)
1003 {
1004         uint64_t value;
1005 
1006         do {
1007                 value = zfs_prop_random_value(prop, ztest_random(-1ULL));
1008         } while (prop == ZFS_PROP_CHECKSUM && value == ZIO_CHECKSUM_OFF);
1009 
1010         return (value);
1011 }
1012 
1013 static int
1014 ztest_dsl_prop_set_uint64(char *osname, zfs_prop_t prop, uint64_t value,
1015     boolean_t inherit)
1016 {
1017         const char *propname = zfs_prop_to_name(prop);
1018         const char *valname;
1019         char setpoint[MAXPATHLEN];
1020         uint64_t curval;
1021         int error;
1022 
1023         error = dsl_prop_set_int(osname, propname,
1024             (inherit ? ZPROP_SRC_NONE : ZPROP_SRC_LOCAL), value);
1025 
1026         if (error == ENOSPC) {
1027                 ztest_record_enospc(FTAG);
1028                 return (error);
1029         }
1030         ASSERT0(error);
1031 
1032         VERIFY0(dsl_prop_get_integer(osname, propname, &curval, setpoint));
1033 
1034         if (ztest_opts.zo_verbose >= 6) {
1035                 VERIFY(zfs_prop_index_to_string(prop, curval, &valname) == 0);
1036                 (void) printf("%s %s = %s at '%s'\n",
1037                     osname, propname, valname, setpoint);
1038         }
1039 
1040         return (error);
1041 }
1042 
1043 static int
1044 ztest_spa_prop_set_uint64(zpool_prop_t prop, uint64_t value)
1045 {
1046         spa_t *spa = ztest_spa;
1047         nvlist_t *props = NULL;
1048         int error;
1049 
1050         VERIFY(nvlist_alloc(&props, NV_UNIQUE_NAME, 0) == 0);
1051         VERIFY(nvlist_add_uint64(props, zpool_prop_to_name(prop), value) == 0);
1052 
1053         error = spa_prop_set(spa, props);
1054 
1055         nvlist_free(props);
1056 
1057         if (error == ENOSPC) {
1058                 ztest_record_enospc(FTAG);
1059                 return (error);
1060         }
1061         ASSERT0(error);
1062 
1063         return (error);
1064 }
1065 
1066 static void
1067 ztest_rll_init(rll_t *rll)
1068 {
1069         rll->rll_writer = NULL;
1070         rll->rll_readers = 0;
1071         VERIFY(_mutex_init(&rll->rll_lock, USYNC_THREAD, NULL) == 0);
1072         VERIFY(cond_init(&rll->rll_cv, USYNC_THREAD, NULL) == 0);
1073 }
1074 
1075 static void
1076 ztest_rll_destroy(rll_t *rll)
1077 {
1078         ASSERT(rll->rll_writer == NULL);
1079         ASSERT(rll->rll_readers == 0);
1080         VERIFY(_mutex_destroy(&rll->rll_lock) == 0);
1081         VERIFY(cond_destroy(&rll->rll_cv) == 0);
1082 }
1083 
1084 static void
1085 ztest_rll_lock(rll_t *rll, rl_type_t type)
1086 {
1087         VERIFY(mutex_lock(&rll->rll_lock) == 0);
1088 
1089         if (type == RL_READER) {
1090                 while (rll->rll_writer != NULL)
1091                         (void) cond_wait(&rll->rll_cv, &rll->rll_lock);
1092                 rll->rll_readers++;
1093         } else {
1094                 while (rll->rll_writer != NULL || rll->rll_readers)
1095                         (void) cond_wait(&rll->rll_cv, &rll->rll_lock);
1096                 rll->rll_writer = curthread;
1097         }
1098 
1099         VERIFY(mutex_unlock(&rll->rll_lock) == 0);
1100 }
1101 
1102 static void
1103 ztest_rll_unlock(rll_t *rll)
1104 {
1105         VERIFY(mutex_lock(&rll->rll_lock) == 0);
1106 
1107         if (rll->rll_writer) {
1108                 ASSERT(rll->rll_readers == 0);
1109                 rll->rll_writer = NULL;
1110         } else {
1111                 ASSERT(rll->rll_readers != 0);
1112                 ASSERT(rll->rll_writer == NULL);
1113                 rll->rll_readers--;
1114         }
1115 
1116         if (rll->rll_writer == NULL && rll->rll_readers == 0)
1117                 VERIFY(cond_broadcast(&rll->rll_cv) == 0);
1118 
1119         VERIFY(mutex_unlock(&rll->rll_lock) == 0);
1120 }
1121 
1122 static void
1123 ztest_object_lock(ztest_ds_t *zd, uint64_t object, rl_type_t type)
1124 {
1125         rll_t *rll = &zd->zd_object_lock[object & (ZTEST_OBJECT_LOCKS - 1)];
1126 
1127         ztest_rll_lock(rll, type);
1128 }
1129 
1130 static void
1131 ztest_object_unlock(ztest_ds_t *zd, uint64_t object)
1132 {
1133         rll_t *rll = &zd->zd_object_lock[object & (ZTEST_OBJECT_LOCKS - 1)];
1134 
1135         ztest_rll_unlock(rll);
1136 }
1137 
1138 static rl_t *
1139 ztest_range_lock(ztest_ds_t *zd, uint64_t object, uint64_t offset,
1140     uint64_t size, rl_type_t type)
1141 {
1142         uint64_t hash = object ^ (offset % (ZTEST_RANGE_LOCKS + 1));
1143         rll_t *rll = &zd->zd_range_lock[hash & (ZTEST_RANGE_LOCKS - 1)];
1144         rl_t *rl;
1145 
1146         rl = umem_alloc(sizeof (*rl), UMEM_NOFAIL);
1147         rl->rl_object = object;
1148         rl->rl_offset = offset;
1149         rl->rl_size = size;
1150         rl->rl_lock = rll;
1151 
1152         ztest_rll_lock(rll, type);
1153 
1154         return (rl);
1155 }
1156 
1157 static void
1158 ztest_range_unlock(rl_t *rl)
1159 {
1160         rll_t *rll = rl->rl_lock;
1161 
1162         ztest_rll_unlock(rll);
1163 
1164         umem_free(rl, sizeof (*rl));
1165 }
1166 
1167 static void
1168 ztest_zd_init(ztest_ds_t *zd, ztest_shared_ds_t *szd, objset_t *os)
1169 {
1170         zd->zd_os = os;
1171         zd->zd_zilog = dmu_objset_zil(os);
1172         zd->zd_shared = szd;
1173         dmu_objset_name(os, zd->zd_name);
1174 
1175         if (zd->zd_shared != NULL)
1176                 zd->zd_shared->zd_seq = 0;
1177 
1178         VERIFY(rwlock_init(&zd->zd_zilog_lock, USYNC_THREAD, NULL) == 0);
1179         VERIFY(_mutex_init(&zd->zd_dirobj_lock, USYNC_THREAD, NULL) == 0);
1180 
1181         for (int l = 0; l < ZTEST_OBJECT_LOCKS; l++)
1182                 ztest_rll_init(&zd->zd_object_lock[l]);
1183 
1184         for (int l = 0; l < ZTEST_RANGE_LOCKS; l++)
1185                 ztest_rll_init(&zd->zd_range_lock[l]);
1186 }
1187 
1188 static void
1189 ztest_zd_fini(ztest_ds_t *zd)
1190 {
1191         VERIFY(_mutex_destroy(&zd->zd_dirobj_lock) == 0);
1192 
1193         for (int l = 0; l < ZTEST_OBJECT_LOCKS; l++)
1194                 ztest_rll_destroy(&zd->zd_object_lock[l]);
1195 
1196         for (int l = 0; l < ZTEST_RANGE_LOCKS; l++)
1197                 ztest_rll_destroy(&zd->zd_range_lock[l]);
1198 }
1199 
1200 #define TXG_MIGHTWAIT   (ztest_random(10) == 0 ? TXG_NOWAIT : TXG_WAIT)
1201 
1202 static uint64_t
1203 ztest_tx_assign(dmu_tx_t *tx, uint64_t txg_how, const char *tag)
1204 {
1205         uint64_t txg;
1206         int error;
1207 
1208         /*
1209          * Attempt to assign tx to some transaction group.
1210          */
1211         error = dmu_tx_assign(tx, txg_how);
1212         if (error) {
1213                 if (error == ERESTART) {
1214                         ASSERT(txg_how == TXG_NOWAIT);
1215                         dmu_tx_wait(tx);
1216                 } else {
1217                         ASSERT3U(error, ==, ENOSPC);
1218                         ztest_record_enospc(tag);
1219                 }
1220                 dmu_tx_abort(tx);
1221                 return (0);
1222         }
1223         txg = dmu_tx_get_txg(tx);
1224         ASSERT(txg != 0);
1225         return (txg);
1226 }
1227 
1228 static void
1229 ztest_pattern_set(void *buf, uint64_t size, uint64_t value)
1230 {
1231         uint64_t *ip = buf;
1232         uint64_t *ip_end = (uint64_t *)((uintptr_t)buf + (uintptr_t)size);
1233 
1234         while (ip < ip_end)
1235                 *ip++ = value;
1236 }
1237 
1238 static boolean_t
1239 ztest_pattern_match(void *buf, uint64_t size, uint64_t value)
1240 {
1241         uint64_t *ip = buf;
1242         uint64_t *ip_end = (uint64_t *)((uintptr_t)buf + (uintptr_t)size);
1243         uint64_t diff = 0;
1244 
1245         while (ip < ip_end)
1246                 diff |= (value - *ip++);
1247 
1248         return (diff == 0);
1249 }
1250 
1251 static void
1252 ztest_bt_generate(ztest_block_tag_t *bt, objset_t *os, uint64_t object,
1253     uint64_t offset, uint64_t gen, uint64_t txg, uint64_t crtxg)
1254 {
1255         bt->bt_magic = BT_MAGIC;
1256         bt->bt_objset = dmu_objset_id(os);
1257         bt->bt_object = object;
1258         bt->bt_offset = offset;
1259         bt->bt_gen = gen;
1260         bt->bt_txg = txg;
1261         bt->bt_crtxg = crtxg;
1262 }
1263 
1264 static void
1265 ztest_bt_verify(ztest_block_tag_t *bt, objset_t *os, uint64_t object,
1266     uint64_t offset, uint64_t gen, uint64_t txg, uint64_t crtxg)
1267 {
1268         ASSERT(bt->bt_magic == BT_MAGIC);
1269         ASSERT(bt->bt_objset == dmu_objset_id(os));
1270         ASSERT(bt->bt_object == object);
1271         ASSERT(bt->bt_offset == offset);
1272         ASSERT(bt->bt_gen <= gen);
1273         ASSERT(bt->bt_txg <= txg);
1274         ASSERT(bt->bt_crtxg == crtxg);
1275 }
1276 
1277 static ztest_block_tag_t *
1278 ztest_bt_bonus(dmu_buf_t *db)
1279 {
1280         dmu_object_info_t doi;
1281         ztest_block_tag_t *bt;
1282 
1283         dmu_object_info_from_db(db, &doi);
1284         ASSERT3U(doi.doi_bonus_size, <=, db->db_size);
1285         ASSERT3U(doi.doi_bonus_size, >=, sizeof (*bt));
1286         bt = (void *)((char *)db->db_data + doi.doi_bonus_size - sizeof (*bt));
1287 
1288         return (bt);
1289 }
1290 
1291 /*
1292  * ZIL logging ops
1293  */
1294 
1295 #define lrz_type        lr_mode
1296 #define lrz_blocksize   lr_uid
1297 #define lrz_ibshift     lr_gid
1298 #define lrz_bonustype   lr_rdev
1299 #define lrz_bonuslen    lr_crtime[1]
1300 
1301 static void
1302 ztest_log_create(ztest_ds_t *zd, dmu_tx_t *tx, lr_create_t *lr)
1303 {
1304         char *name = (void *)(lr + 1);          /* name follows lr */
1305         size_t namesize = strlen(name) + 1;
1306         itx_t *itx;
1307 
1308         if (zil_replaying(zd->zd_zilog, tx))
1309                 return;
1310 
1311         itx = zil_itx_create(TX_CREATE, sizeof (*lr) + namesize);
1312         bcopy(&lr->lr_common + 1, &itx->itx_lr + 1,
1313             sizeof (*lr) + namesize - sizeof (lr_t));
1314 
1315         zil_itx_assign(zd->zd_zilog, itx, tx);
1316 }
1317 
1318 static void
1319 ztest_log_remove(ztest_ds_t *zd, dmu_tx_t *tx, lr_remove_t *lr, uint64_t object)
1320 {
1321         char *name = (void *)(lr + 1);          /* name follows lr */
1322         size_t namesize = strlen(name) + 1;
1323         itx_t *itx;
1324 
1325         if (zil_replaying(zd->zd_zilog, tx))
1326                 return;
1327 
1328         itx = zil_itx_create(TX_REMOVE, sizeof (*lr) + namesize);
1329         bcopy(&lr->lr_common + 1, &itx->itx_lr + 1,
1330             sizeof (*lr) + namesize - sizeof (lr_t));
1331 
1332         itx->itx_oid = object;
1333         zil_itx_assign(zd->zd_zilog, itx, tx);
1334 }
1335 
1336 static void
1337 ztest_log_write(ztest_ds_t *zd, dmu_tx_t *tx, lr_write_t *lr)
1338 {
1339         itx_t *itx;
1340         itx_wr_state_t write_state = ztest_random(WR_NUM_STATES);
1341 
1342         if (zil_replaying(zd->zd_zilog, tx))
1343                 return;
1344 
1345         if (lr->lr_length > ZIL_MAX_LOG_DATA)
1346                 write_state = WR_INDIRECT;
1347 
1348         itx = zil_itx_create(TX_WRITE,
1349             sizeof (*lr) + (write_state == WR_COPIED ? lr->lr_length : 0));
1350 
1351         if (write_state == WR_COPIED &&
1352             dmu_read(zd->zd_os, lr->lr_foid, lr->lr_offset, lr->lr_length,
1353             ((lr_write_t *)&itx->itx_lr) + 1, DMU_READ_NO_PREFETCH) != 0) {
1354                 zil_itx_destroy(itx);
1355                 itx = zil_itx_create(TX_WRITE, sizeof (*lr));
1356                 write_state = WR_NEED_COPY;
1357         }
1358         itx->itx_private = zd;
1359         itx->itx_wr_state = write_state;
1360         itx->itx_sync = (ztest_random(8) == 0);
1361         itx->itx_sod += (write_state == WR_NEED_COPY ? lr->lr_length : 0);
1362 
1363         bcopy(&lr->lr_common + 1, &itx->itx_lr + 1,
1364             sizeof (*lr) - sizeof (lr_t));
1365 
1366         zil_itx_assign(zd->zd_zilog, itx, tx);
1367 }
1368 
1369 static void
1370 ztest_log_truncate(ztest_ds_t *zd, dmu_tx_t *tx, lr_truncate_t *lr)
1371 {
1372         itx_t *itx;
1373 
1374         if (zil_replaying(zd->zd_zilog, tx))
1375                 return;
1376 
1377         itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr));
1378         bcopy(&lr->lr_common + 1, &itx->itx_lr + 1,
1379             sizeof (*lr) - sizeof (lr_t));
1380 
1381         itx->itx_sync = B_FALSE;
1382         zil_itx_assign(zd->zd_zilog, itx, tx);
1383 }
1384 
1385 static void
1386 ztest_log_setattr(ztest_ds_t *zd, dmu_tx_t *tx, lr_setattr_t *lr)
1387 {
1388         itx_t *itx;
1389 
1390         if (zil_replaying(zd->zd_zilog, tx))
1391                 return;
1392 
1393         itx = zil_itx_create(TX_SETATTR, sizeof (*lr));
1394         bcopy(&lr->lr_common + 1, &itx->itx_lr + 1,
1395             sizeof (*lr) - sizeof (lr_t));
1396 
1397         itx->itx_sync = B_FALSE;
1398         zil_itx_assign(zd->zd_zilog, itx, tx);
1399 }
1400 
1401 /*
1402  * ZIL replay ops
1403  */
1404 static int
1405 ztest_replay_create(ztest_ds_t *zd, lr_create_t *lr, boolean_t byteswap)
1406 {
1407         char *name = (void *)(lr + 1);          /* name follows lr */
1408         objset_t *os = zd->zd_os;
1409         ztest_block_tag_t *bbt;
1410         dmu_buf_t *db;
1411         dmu_tx_t *tx;
1412         uint64_t txg;
1413         int error = 0;
1414 
1415         if (byteswap)
1416                 byteswap_uint64_array(lr, sizeof (*lr));
1417 
1418         ASSERT(lr->lr_doid == ZTEST_DIROBJ);
1419         ASSERT(name[0] != '\0');
1420 
1421         tx = dmu_tx_create(os);
1422 
1423         dmu_tx_hold_zap(tx, lr->lr_doid, B_TRUE, name);
1424 
1425         if (lr->lrz_type == DMU_OT_ZAP_OTHER) {
1426                 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, B_TRUE, NULL);
1427         } else {
1428                 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1429         }
1430 
1431         txg = ztest_tx_assign(tx, TXG_WAIT, FTAG);
1432         if (txg == 0)
1433                 return (ENOSPC);
1434 
1435         ASSERT(dmu_objset_zil(os)->zl_replay == !!lr->lr_foid);
1436 
1437         if (lr->lrz_type == DMU_OT_ZAP_OTHER) {
1438                 if (lr->lr_foid == 0) {
1439                         lr->lr_foid = zap_create(os,
1440                             lr->lrz_type, lr->lrz_bonustype,
1441                             lr->lrz_bonuslen, tx);
1442                 } else {
1443                         error = zap_create_claim(os, lr->lr_foid,
1444                             lr->lrz_type, lr->lrz_bonustype,
1445                             lr->lrz_bonuslen, tx);
1446                 }
1447         } else {
1448                 if (lr->lr_foid == 0) {
1449                         lr->lr_foid = dmu_object_alloc(os,
1450                             lr->lrz_type, 0, lr->lrz_bonustype,
1451                             lr->lrz_bonuslen, tx);
1452                 } else {
1453                         error = dmu_object_claim(os, lr->lr_foid,
1454                             lr->lrz_type, 0, lr->lrz_bonustype,
1455                             lr->lrz_bonuslen, tx);
1456                 }
1457         }
1458 
1459         if (error) {
1460                 ASSERT3U(error, ==, EEXIST);
1461                 ASSERT(zd->zd_zilog->zl_replay);
1462                 dmu_tx_commit(tx);
1463                 return (error);
1464         }
1465 
1466         ASSERT(lr->lr_foid != 0);
1467 
1468         if (lr->lrz_type != DMU_OT_ZAP_OTHER)
1469                 VERIFY3U(0, ==, dmu_object_set_blocksize(os, lr->lr_foid,
1470                     lr->lrz_blocksize, lr->lrz_ibshift, tx));
1471 
1472         VERIFY3U(0, ==, dmu_bonus_hold(os, lr->lr_foid, FTAG, &db));
1473         bbt = ztest_bt_bonus(db);
1474         dmu_buf_will_dirty(db, tx);
1475         ztest_bt_generate(bbt, os, lr->lr_foid, -1ULL, lr->lr_gen, txg, txg);
1476         dmu_buf_rele(db, FTAG);
1477 
1478         VERIFY3U(0, ==, zap_add(os, lr->lr_doid, name, sizeof (uint64_t), 1,
1479             &lr->lr_foid, tx));
1480 
1481         (void) ztest_log_create(zd, tx, lr);
1482 
1483         dmu_tx_commit(tx);
1484 
1485         return (0);
1486 }
1487 
1488 static int
1489 ztest_replay_remove(ztest_ds_t *zd, lr_remove_t *lr, boolean_t byteswap)
1490 {
1491         char *name = (void *)(lr + 1);          /* name follows lr */
1492         objset_t *os = zd->zd_os;
1493         dmu_object_info_t doi;
1494         dmu_tx_t *tx;
1495         uint64_t object, txg;
1496 
1497         if (byteswap)
1498                 byteswap_uint64_array(lr, sizeof (*lr));
1499 
1500         ASSERT(lr->lr_doid == ZTEST_DIROBJ);
1501         ASSERT(name[0] != '\0');
1502 
1503         VERIFY3U(0, ==,
1504             zap_lookup(os, lr->lr_doid, name, sizeof (object), 1, &object));
1505         ASSERT(object != 0);
1506 
1507         ztest_object_lock(zd, object, RL_WRITER);
1508 
1509         VERIFY3U(0, ==, dmu_object_info(os, object, &doi));
1510 
1511         tx = dmu_tx_create(os);
1512 
1513         dmu_tx_hold_zap(tx, lr->lr_doid, B_FALSE, name);
1514         dmu_tx_hold_free(tx, object, 0, DMU_OBJECT_END);
1515 
1516         txg = ztest_tx_assign(tx, TXG_WAIT, FTAG);
1517         if (txg == 0) {
1518                 ztest_object_unlock(zd, object);
1519                 return (ENOSPC);
1520         }
1521 
1522         if (doi.doi_type == DMU_OT_ZAP_OTHER) {
1523                 VERIFY3U(0, ==, zap_destroy(os, object, tx));
1524         } else {
1525                 VERIFY3U(0, ==, dmu_object_free(os, object, tx));
1526         }
1527 
1528         VERIFY3U(0, ==, zap_remove(os, lr->lr_doid, name, tx));
1529 
1530         (void) ztest_log_remove(zd, tx, lr, object);
1531 
1532         dmu_tx_commit(tx);
1533 
1534         ztest_object_unlock(zd, object);
1535 
1536         return (0);
1537 }
1538 
1539 static int
1540 ztest_replay_write(ztest_ds_t *zd, lr_write_t *lr, boolean_t byteswap)
1541 {
1542         objset_t *os = zd->zd_os;
1543         void *data = lr + 1;                    /* data follows lr */
1544         uint64_t offset, length;
1545         ztest_block_tag_t *bt = data;
1546         ztest_block_tag_t *bbt;
1547         uint64_t gen, txg, lrtxg, crtxg;
1548         dmu_object_info_t doi;
1549         dmu_tx_t *tx;
1550         dmu_buf_t *db;
1551         arc_buf_t *abuf = NULL;
1552         rl_t *rl;
1553 
1554         if (byteswap)
1555                 byteswap_uint64_array(lr, sizeof (*lr));
1556 
1557         offset = lr->lr_offset;
1558         length = lr->lr_length;
1559 
1560         /* If it's a dmu_sync() block, write the whole block */
1561         if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) {
1562                 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr);
1563                 if (length < blocksize) {
1564                         offset -= offset % blocksize;
1565                         length = blocksize;
1566                 }
1567         }
1568 
1569         if (bt->bt_magic == BSWAP_64(BT_MAGIC))
1570                 byteswap_uint64_array(bt, sizeof (*bt));
1571 
1572         if (bt->bt_magic != BT_MAGIC)
1573                 bt = NULL;
1574 
1575         ztest_object_lock(zd, lr->lr_foid, RL_READER);
1576         rl = ztest_range_lock(zd, lr->lr_foid, offset, length, RL_WRITER);
1577 
1578         VERIFY3U(0, ==, dmu_bonus_hold(os, lr->lr_foid, FTAG, &db));
1579 
1580         dmu_object_info_from_db(db, &doi);
1581 
1582         bbt = ztest_bt_bonus(db);
1583         ASSERT3U(bbt->bt_magic, ==, BT_MAGIC);
1584         gen = bbt->bt_gen;
1585         crtxg = bbt->bt_crtxg;
1586         lrtxg = lr->lr_common.lrc_txg;
1587 
1588         tx = dmu_tx_create(os);
1589 
1590         dmu_tx_hold_write(tx, lr->lr_foid, offset, length);
1591 
1592         if (ztest_random(8) == 0 && length == doi.doi_data_block_size &&
1593             P2PHASE(offset, length) == 0)
1594                 abuf = dmu_request_arcbuf(db, length);
1595 
1596         txg = ztest_tx_assign(tx, TXG_WAIT, FTAG);
1597         if (txg == 0) {
1598                 if (abuf != NULL)
1599                         dmu_return_arcbuf(abuf);
1600                 dmu_buf_rele(db, FTAG);
1601                 ztest_range_unlock(rl);
1602                 ztest_object_unlock(zd, lr->lr_foid);
1603                 return (ENOSPC);
1604         }
1605 
1606         if (bt != NULL) {
1607                 /*
1608                  * Usually, verify the old data before writing new data --
1609                  * but not always, because we also want to verify correct
1610                  * behavior when the data was not recently read into cache.
1611                  */
1612                 ASSERT(offset % doi.doi_data_block_size == 0);
1613                 if (ztest_random(4) != 0) {
1614                         int prefetch = ztest_random(2) ?
1615                             DMU_READ_PREFETCH : DMU_READ_NO_PREFETCH;
1616                         ztest_block_tag_t rbt;
1617 
1618                         VERIFY(dmu_read(os, lr->lr_foid, offset,
1619                             sizeof (rbt), &rbt, prefetch) == 0);
1620                         if (rbt.bt_magic == BT_MAGIC) {
1621                                 ztest_bt_verify(&rbt, os, lr->lr_foid,
1622                                     offset, gen, txg, crtxg);
1623                         }
1624                 }
1625 
1626                 /*
1627                  * Writes can appear to be newer than the bonus buffer because
1628                  * the ztest_get_data() callback does a dmu_read() of the
1629                  * open-context data, which may be different than the data
1630                  * as it was when the write was generated.
1631                  */
1632                 if (zd->zd_zilog->zl_replay) {
1633                         ztest_bt_verify(bt, os, lr->lr_foid, offset,
1634                             MAX(gen, bt->bt_gen), MAX(txg, lrtxg),
1635                             bt->bt_crtxg);
1636                 }
1637 
1638                 /*
1639                  * Set the bt's gen/txg to the bonus buffer's gen/txg
1640                  * so that all of the usual ASSERTs will work.
1641                  */
1642                 ztest_bt_generate(bt, os, lr->lr_foid, offset, gen, txg, crtxg);
1643         }
1644 
1645         if (abuf == NULL) {
1646                 dmu_write(os, lr->lr_foid, offset, length, data, tx);
1647         } else {
1648                 bcopy(data, abuf->b_data, length);
1649                 dmu_assign_arcbuf(db, offset, abuf, tx);
1650         }
1651 
1652         (void) ztest_log_write(zd, tx, lr);
1653 
1654         dmu_buf_rele(db, FTAG);
1655 
1656         dmu_tx_commit(tx);
1657 
1658         ztest_range_unlock(rl);
1659         ztest_object_unlock(zd, lr->lr_foid);
1660 
1661         return (0);
1662 }
1663 
1664 static int
1665 ztest_replay_truncate(ztest_ds_t *zd, lr_truncate_t *lr, boolean_t byteswap)
1666 {
1667         objset_t *os = zd->zd_os;
1668         dmu_tx_t *tx;
1669         uint64_t txg;
1670         rl_t *rl;
1671 
1672         if (byteswap)
1673                 byteswap_uint64_array(lr, sizeof (*lr));
1674 
1675         ztest_object_lock(zd, lr->lr_foid, RL_READER);
1676         rl = ztest_range_lock(zd, lr->lr_foid, lr->lr_offset, lr->lr_length,
1677             RL_WRITER);
1678 
1679         tx = dmu_tx_create(os);
1680 
1681         dmu_tx_hold_free(tx, lr->lr_foid, lr->lr_offset, lr->lr_length);
1682 
1683         txg = ztest_tx_assign(tx, TXG_WAIT, FTAG);
1684         if (txg == 0) {
1685                 ztest_range_unlock(rl);
1686                 ztest_object_unlock(zd, lr->lr_foid);
1687                 return (ENOSPC);
1688         }
1689 
1690         VERIFY(dmu_free_range(os, lr->lr_foid, lr->lr_offset,
1691             lr->lr_length, tx) == 0);
1692 
1693         (void) ztest_log_truncate(zd, tx, lr);
1694 
1695         dmu_tx_commit(tx);
1696 
1697         ztest_range_unlock(rl);
1698         ztest_object_unlock(zd, lr->lr_foid);
1699 
1700         return (0);
1701 }
1702 
1703 static int
1704 ztest_replay_setattr(ztest_ds_t *zd, lr_setattr_t *lr, boolean_t byteswap)
1705 {
1706         objset_t *os = zd->zd_os;
1707         dmu_tx_t *tx;
1708         dmu_buf_t *db;
1709         ztest_block_tag_t *bbt;
1710         uint64_t txg, lrtxg, crtxg;
1711 
1712         if (byteswap)
1713                 byteswap_uint64_array(lr, sizeof (*lr));
1714 
1715         ztest_object_lock(zd, lr->lr_foid, RL_WRITER);
1716 
1717         VERIFY3U(0, ==, dmu_bonus_hold(os, lr->lr_foid, FTAG, &db));
1718 
1719         tx = dmu_tx_create(os);
1720         dmu_tx_hold_bonus(tx, lr->lr_foid);
1721 
1722         txg = ztest_tx_assign(tx, TXG_WAIT, FTAG);
1723         if (txg == 0) {
1724                 dmu_buf_rele(db, FTAG);
1725                 ztest_object_unlock(zd, lr->lr_foid);
1726                 return (ENOSPC);
1727         }
1728 
1729         bbt = ztest_bt_bonus(db);
1730         ASSERT3U(bbt->bt_magic, ==, BT_MAGIC);
1731         crtxg = bbt->bt_crtxg;
1732         lrtxg = lr->lr_common.lrc_txg;
1733 
1734         if (zd->zd_zilog->zl_replay) {
1735                 ASSERT(lr->lr_size != 0);
1736                 ASSERT(lr->lr_mode != 0);
1737                 ASSERT(lrtxg != 0);
1738         } else {
1739                 /*
1740                  * Randomly change the size and increment the generation.
1741                  */
1742                 lr->lr_size = (ztest_random(db->db_size / sizeof (*bbt)) + 1) *
1743                     sizeof (*bbt);
1744                 lr->lr_mode = bbt->bt_gen + 1;
1745                 ASSERT(lrtxg == 0);
1746         }
1747 
1748         /*
1749          * Verify that the current bonus buffer is not newer than our txg.
1750          */
1751         ztest_bt_verify(bbt, os, lr->lr_foid, -1ULL, lr->lr_mode,
1752             MAX(txg, lrtxg), crtxg);
1753 
1754         dmu_buf_will_dirty(db, tx);
1755 
1756         ASSERT3U(lr->lr_size, >=, sizeof (*bbt));
1757         ASSERT3U(lr->lr_size, <=, db->db_size);
1758         VERIFY0(dmu_set_bonus(db, lr->lr_size, tx));
1759         bbt = ztest_bt_bonus(db);
1760 
1761         ztest_bt_generate(bbt, os, lr->lr_foid, -1ULL, lr->lr_mode, txg, crtxg);
1762 
1763         dmu_buf_rele(db, FTAG);
1764 
1765         (void) ztest_log_setattr(zd, tx, lr);
1766 
1767         dmu_tx_commit(tx);
1768 
1769         ztest_object_unlock(zd, lr->lr_foid);
1770 
1771         return (0);
1772 }
1773 
1774 zil_replay_func_t *ztest_replay_vector[TX_MAX_TYPE] = {
1775         NULL,                   /* 0 no such transaction type */
1776         ztest_replay_create,    /* TX_CREATE */
1777         NULL,                   /* TX_MKDIR */
1778         NULL,                   /* TX_MKXATTR */
1779         NULL,                   /* TX_SYMLINK */
1780         ztest_replay_remove,    /* TX_REMOVE */
1781         NULL,                   /* TX_RMDIR */
1782         NULL,                   /* TX_LINK */
1783         NULL,                   /* TX_RENAME */
1784         ztest_replay_write,     /* TX_WRITE */
1785         ztest_replay_truncate,  /* TX_TRUNCATE */
1786         ztest_replay_setattr,   /* TX_SETATTR */
1787         NULL,                   /* TX_ACL */
1788         NULL,                   /* TX_CREATE_ACL */
1789         NULL,                   /* TX_CREATE_ATTR */
1790         NULL,                   /* TX_CREATE_ACL_ATTR */
1791         NULL,                   /* TX_MKDIR_ACL */
1792         NULL,                   /* TX_MKDIR_ATTR */
1793         NULL,                   /* TX_MKDIR_ACL_ATTR */
1794         NULL,                   /* TX_WRITE2 */
1795 };
1796 
1797 /*
1798  * ZIL get_data callbacks
1799  */
1800 
1801 static void
1802 ztest_get_done(zgd_t *zgd, int error)
1803 {
1804         ztest_ds_t *zd = zgd->zgd_private;
1805         uint64_t object = zgd->zgd_rl->rl_object;
1806 
1807         if (zgd->zgd_db)
1808                 dmu_buf_rele(zgd->zgd_db, zgd);
1809 
1810         ztest_range_unlock(zgd->zgd_rl);
1811         ztest_object_unlock(zd, object);
1812 
1813         if (error == 0 && zgd->zgd_bp)
1814                 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
1815 
1816         umem_free(zgd, sizeof (*zgd));
1817 }
1818 
1819 static int
1820 ztest_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
1821 {
1822         ztest_ds_t *zd = arg;
1823         objset_t *os = zd->zd_os;
1824         uint64_t object = lr->lr_foid;
1825         uint64_t offset = lr->lr_offset;
1826         uint64_t size = lr->lr_length;
1827         blkptr_t *bp = &lr->lr_blkptr;
1828         uint64_t txg = lr->lr_common.lrc_txg;
1829         uint64_t crtxg;
1830         dmu_object_info_t doi;
1831         dmu_buf_t *db;
1832         zgd_t *zgd;
1833         int error;
1834 
1835         ztest_object_lock(zd, object, RL_READER);
1836         error = dmu_bonus_hold(os, object, FTAG, &db);
1837         if (error) {
1838                 ztest_object_unlock(zd, object);
1839                 return (error);
1840         }
1841 
1842         crtxg = ztest_bt_bonus(db)->bt_crtxg;
1843 
1844         if (crtxg == 0 || crtxg > txg) {
1845                 dmu_buf_rele(db, FTAG);
1846                 ztest_object_unlock(zd, object);
1847                 return (ENOENT);
1848         }
1849 
1850         dmu_object_info_from_db(db, &doi);
1851         dmu_buf_rele(db, FTAG);
1852         db = NULL;
1853 
1854         zgd = umem_zalloc(sizeof (*zgd), UMEM_NOFAIL);
1855         zgd->zgd_zilog = zd->zd_zilog;
1856         zgd->zgd_private = zd;
1857 
1858         if (buf != NULL) {      /* immediate write */
1859                 zgd->zgd_rl = ztest_range_lock(zd, object, offset, size,
1860                     RL_READER);
1861 
1862                 error = dmu_read(os, object, offset, size, buf,
1863                     DMU_READ_NO_PREFETCH);
1864                 ASSERT(error == 0);
1865         } else {
1866                 size = doi.doi_data_block_size;
1867                 if (ISP2(size)) {
1868                         offset = P2ALIGN(offset, size);
1869                 } else {
1870                         ASSERT(offset < size);
1871                         offset = 0;
1872                 }
1873 
1874                 zgd->zgd_rl = ztest_range_lock(zd, object, offset, size,
1875                     RL_READER);
1876 
1877                 error = dmu_buf_hold(os, object, offset, zgd, &db,
1878                     DMU_READ_NO_PREFETCH);
1879 
1880                 if (error == 0) {
1881                         blkptr_t *obp = dmu_buf_get_blkptr(db);
1882                         if (obp) {
1883                                 ASSERT(BP_IS_HOLE(bp));
1884                                 *bp = *obp;
1885                         }
1886 
1887                         zgd->zgd_db = db;
1888                         zgd->zgd_bp = bp;
1889 
1890                         ASSERT(db->db_offset == offset);
1891                         ASSERT(db->db_size == size);
1892 
1893                         error = dmu_sync(zio, lr->lr_common.lrc_txg,
1894                             ztest_get_done, zgd);
1895 
1896                         if (error == 0)
1897                                 return (0);
1898                 }
1899         }
1900 
1901         ztest_get_done(zgd, error);
1902 
1903         return (error);
1904 }
1905 
1906 static void *
1907 ztest_lr_alloc(size_t lrsize, char *name)
1908 {
1909         char *lr;
1910         size_t namesize = name ? strlen(name) + 1 : 0;
1911 
1912         lr = umem_zalloc(lrsize + namesize, UMEM_NOFAIL);
1913 
1914         if (name)
1915                 bcopy(name, lr + lrsize, namesize);
1916 
1917         return (lr);
1918 }
1919 
1920 void
1921 ztest_lr_free(void *lr, size_t lrsize, char *name)
1922 {
1923         size_t namesize = name ? strlen(name) + 1 : 0;
1924 
1925         umem_free(lr, lrsize + namesize);
1926 }
1927 
1928 /*
1929  * Lookup a bunch of objects.  Returns the number of objects not found.
1930  */
1931 static int
1932 ztest_lookup(ztest_ds_t *zd, ztest_od_t *od, int count)
1933 {
1934         int missing = 0;
1935         int error;
1936 
1937         ASSERT(_mutex_held(&zd->zd_dirobj_lock));
1938 
1939         for (int i = 0; i < count; i++, od++) {
1940                 od->od_object = 0;
1941                 error = zap_lookup(zd->zd_os, od->od_dir, od->od_name,
1942                     sizeof (uint64_t), 1, &od->od_object);
1943                 if (error) {
1944                         ASSERT(error == ENOENT);
1945                         ASSERT(od->od_object == 0);
1946                         missing++;
1947                 } else {
1948                         dmu_buf_t *db;
1949                         ztest_block_tag_t *bbt;
1950                         dmu_object_info_t doi;
1951 
1952                         ASSERT(od->od_object != 0);
1953                         ASSERT(missing == 0);   /* there should be no gaps */
1954 
1955                         ztest_object_lock(zd, od->od_object, RL_READER);
1956                         VERIFY3U(0, ==, dmu_bonus_hold(zd->zd_os,
1957                             od->od_object, FTAG, &db));
1958                         dmu_object_info_from_db(db, &doi);
1959                         bbt = ztest_bt_bonus(db);
1960                         ASSERT3U(bbt->bt_magic, ==, BT_MAGIC);
1961                         od->od_type = doi.doi_type;
1962                         od->od_blocksize = doi.doi_data_block_size;
1963                         od->od_gen = bbt->bt_gen;
1964                         dmu_buf_rele(db, FTAG);
1965                         ztest_object_unlock(zd, od->od_object);
1966                 }
1967         }
1968 
1969         return (missing);
1970 }
1971 
1972 static int
1973 ztest_create(ztest_ds_t *zd, ztest_od_t *od, int count)
1974 {
1975         int missing = 0;
1976 
1977         ASSERT(_mutex_held(&zd->zd_dirobj_lock));
1978 
1979         for (int i = 0; i < count; i++, od++) {
1980                 if (missing) {
1981                         od->od_object = 0;
1982                         missing++;
1983                         continue;
1984                 }
1985 
1986                 lr_create_t *lr = ztest_lr_alloc(sizeof (*lr), od->od_name);
1987 
1988                 lr->lr_doid = od->od_dir;
1989                 lr->lr_foid = 0;     /* 0 to allocate, > 0 to claim */
1990                 lr->lrz_type = od->od_crtype;
1991                 lr->lrz_blocksize = od->od_crblocksize;
1992                 lr->lrz_ibshift = ztest_random_ibshift();
1993                 lr->lrz_bonustype = DMU_OT_UINT64_OTHER;
1994                 lr->lrz_bonuslen = dmu_bonus_max();
1995                 lr->lr_gen = od->od_crgen;
1996                 lr->lr_crtime[0] = time(NULL);
1997 
1998                 if (ztest_replay_create(zd, lr, B_FALSE) != 0) {
1999                         ASSERT(missing == 0);
2000                         od->od_object = 0;
2001                         missing++;
2002                 } else {
2003                         od->od_object = lr->lr_foid;
2004                         od->od_type = od->od_crtype;
2005                         od->od_blocksize = od->od_crblocksize;
2006                         od->od_gen = od->od_crgen;
2007                         ASSERT(od->od_object != 0);
2008                 }
2009 
2010                 ztest_lr_free(lr, sizeof (*lr), od->od_name);
2011         }
2012 
2013         return (missing);
2014 }
2015 
2016 static int
2017 ztest_remove(ztest_ds_t *zd, ztest_od_t *od, int count)
2018 {
2019         int missing = 0;
2020         int error;
2021 
2022         ASSERT(_mutex_held(&zd->zd_dirobj_lock));
2023 
2024         od += count - 1;
2025 
2026         for (int i = count - 1; i >= 0; i--, od--) {
2027                 if (missing) {
2028                         missing++;
2029                         continue;
2030                 }
2031 
2032                 /*
2033                  * No object was found.
2034                  */
2035                 if (od->od_object == 0)
2036                         continue;
2037 
2038                 lr_remove_t *lr = ztest_lr_alloc(sizeof (*lr), od->od_name);
2039 
2040                 lr->lr_doid = od->od_dir;
2041 
2042                 if ((error = ztest_replay_remove(zd, lr, B_FALSE)) != 0) {
2043                         ASSERT3U(error, ==, ENOSPC);
2044                         missing++;
2045                 } else {
2046                         od->od_object = 0;
2047                 }
2048                 ztest_lr_free(lr, sizeof (*lr), od->od_name);
2049         }
2050 
2051         return (missing);
2052 }
2053 
2054 static int
2055 ztest_write(ztest_ds_t *zd, uint64_t object, uint64_t offset, uint64_t size,
2056     void *data)
2057 {
2058         lr_write_t *lr;
2059         int error;
2060 
2061         lr = ztest_lr_alloc(sizeof (*lr) + size, NULL);
2062 
2063         lr->lr_foid = object;
2064         lr->lr_offset = offset;
2065         lr->lr_length = size;
2066         lr->lr_blkoff = 0;
2067         BP_ZERO(&lr->lr_blkptr);
2068 
2069         bcopy(data, lr + 1, size);
2070 
2071         error = ztest_replay_write(zd, lr, B_FALSE);
2072 
2073         ztest_lr_free(lr, sizeof (*lr) + size, NULL);
2074 
2075         return (error);
2076 }
2077 
2078 static int
2079 ztest_truncate(ztest_ds_t *zd, uint64_t object, uint64_t offset, uint64_t size)
2080 {
2081         lr_truncate_t *lr;
2082         int error;
2083 
2084         lr = ztest_lr_alloc(sizeof (*lr), NULL);
2085 
2086         lr->lr_foid = object;
2087         lr->lr_offset = offset;
2088         lr->lr_length = size;
2089 
2090         error = ztest_replay_truncate(zd, lr, B_FALSE);
2091 
2092         ztest_lr_free(lr, sizeof (*lr), NULL);
2093 
2094         return (error);
2095 }
2096 
2097 static int
2098 ztest_setattr(ztest_ds_t *zd, uint64_t object)
2099 {
2100         lr_setattr_t *lr;
2101         int error;
2102 
2103         lr = ztest_lr_alloc(sizeof (*lr), NULL);
2104 
2105         lr->lr_foid = object;
2106         lr->lr_size = 0;
2107         lr->lr_mode = 0;
2108 
2109         error = ztest_replay_setattr(zd, lr, B_FALSE);
2110 
2111         ztest_lr_free(lr, sizeof (*lr), NULL);
2112 
2113         return (error);
2114 }
2115 
2116 static void
2117 ztest_prealloc(ztest_ds_t *zd, uint64_t object, uint64_t offset, uint64_t size)
2118 {
2119         objset_t *os = zd->zd_os;
2120         dmu_tx_t *tx;
2121         uint64_t txg;
2122         rl_t *rl;
2123 
2124         txg_wait_synced(dmu_objset_pool(os), 0);
2125 
2126         ztest_object_lock(zd, object, RL_READER);
2127         rl = ztest_range_lock(zd, object, offset, size, RL_WRITER);
2128 
2129         tx = dmu_tx_create(os);
2130 
2131         dmu_tx_hold_write(tx, object, offset, size);
2132 
2133         txg = ztest_tx_assign(tx, TXG_WAIT, FTAG);
2134 
2135         if (txg != 0) {
2136                 dmu_prealloc(os, object, offset, size, tx);
2137                 dmu_tx_commit(tx);
2138                 txg_wait_synced(dmu_objset_pool(os), txg);
2139         } else {
2140                 (void) dmu_free_long_range(os, object, offset, size);
2141         }
2142 
2143         ztest_range_unlock(rl);
2144         ztest_object_unlock(zd, object);
2145 }
2146 
2147 static void
2148 ztest_io(ztest_ds_t *zd, uint64_t object, uint64_t offset)
2149 {
2150         int err;
2151         ztest_block_tag_t wbt;
2152         dmu_object_info_t doi;
2153         enum ztest_io_type io_type;
2154         uint64_t blocksize;
2155         void *data;
2156 
2157         VERIFY(dmu_object_info(zd->zd_os, object, &doi) == 0);
2158         blocksize = doi.doi_data_block_size;
2159         data = umem_alloc(blocksize, UMEM_NOFAIL);
2160 
2161         /*
2162          * Pick an i/o type at random, biased toward writing block tags.
2163          */
2164         io_type = ztest_random(ZTEST_IO_TYPES);
2165         if (ztest_random(2) == 0)
2166                 io_type = ZTEST_IO_WRITE_TAG;
2167 
2168         (void) rw_rdlock(&zd->zd_zilog_lock);
2169 
2170         switch (io_type) {
2171 
2172         case ZTEST_IO_WRITE_TAG:
2173                 ztest_bt_generate(&wbt, zd->zd_os, object, offset, 0, 0, 0);
2174                 (void) ztest_write(zd, object, offset, sizeof (wbt), &wbt);
2175                 break;
2176 
2177         case ZTEST_IO_WRITE_PATTERN:
2178                 (void) memset(data, 'a' + (object + offset) % 5, blocksize);
2179                 if (ztest_random(2) == 0) {
2180                         /*
2181                          * Induce fletcher2 collisions to ensure that
2182                          * zio_ddt_collision() detects and resolves them
2183                          * when using fletcher2-verify for deduplication.
2184                          */
2185                         ((uint64_t *)data)[0] ^= 1ULL << 63;
2186                         ((uint64_t *)data)[4] ^= 1ULL << 63;
2187                 }
2188                 (void) ztest_write(zd, object, offset, blocksize, data);
2189                 break;
2190 
2191         case ZTEST_IO_WRITE_ZEROES:
2192                 bzero(data, blocksize);
2193                 (void) ztest_write(zd, object, offset, blocksize, data);
2194                 break;
2195 
2196         case ZTEST_IO_TRUNCATE:
2197                 (void) ztest_truncate(zd, object, offset, blocksize);
2198                 break;
2199 
2200         case ZTEST_IO_SETATTR:
2201                 (void) ztest_setattr(zd, object);
2202                 break;
2203 
2204         case ZTEST_IO_REWRITE:
2205                 (void) rw_rdlock(&ztest_name_lock);
2206                 err = ztest_dsl_prop_set_uint64(zd->zd_name,
2207                     ZFS_PROP_CHECKSUM, spa_dedup_checksum(ztest_spa),
2208                     B_FALSE);
2209                 VERIFY(err == 0 || err == ENOSPC);
2210                 err = ztest_dsl_prop_set_uint64(zd->zd_name,
2211                     ZFS_PROP_COMPRESSION,
2212                     ztest_random_dsl_prop(ZFS_PROP_COMPRESSION),
2213                     B_FALSE);
2214                 VERIFY(err == 0 || err == ENOSPC);
2215                 (void) rw_unlock(&ztest_name_lock);
2216 
2217                 VERIFY0(dmu_read(zd->zd_os, object, offset, blocksize, data,
2218                     DMU_READ_NO_PREFETCH));
2219 
2220                 (void) ztest_write(zd, object, offset, blocksize, data);
2221                 break;
2222         }
2223 
2224         (void) rw_unlock(&zd->zd_zilog_lock);
2225 
2226         umem_free(data, blocksize);
2227 }
2228 
2229 /*
2230  * Initialize an object description template.
2231  */
2232 static void
2233 ztest_od_init(ztest_od_t *od, uint64_t id, char *tag, uint64_t index,
2234     dmu_object_type_t type, uint64_t blocksize, uint64_t gen)
2235 {
2236         od->od_dir = ZTEST_DIROBJ;
2237         od->od_object = 0;
2238 
2239         od->od_crtype = type;
2240         od->od_crblocksize = blocksize ? blocksize : ztest_random_blocksize();
2241         od->od_crgen = gen;
2242 
2243         od->od_type = DMU_OT_NONE;
2244         od->od_blocksize = 0;
2245         od->od_gen = 0;
2246 
2247         (void) snprintf(od->od_name, sizeof (od->od_name), "%s(%lld)[%llu]",
2248             tag, (int64_t)id, index);
2249 }
2250 
2251 /*
2252  * Lookup or create the objects for a test using the od template.
2253  * If the objects do not all exist, or if 'remove' is specified,
2254  * remove any existing objects and create new ones.  Otherwise,
2255  * use the existing objects.
2256  */
2257 static int
2258 ztest_object_init(ztest_ds_t *zd, ztest_od_t *od, size_t size, boolean_t remove)
2259 {
2260         int count = size / sizeof (*od);
2261         int rv = 0;
2262 
2263         VERIFY(mutex_lock(&zd->zd_dirobj_lock) == 0);
2264         if ((ztest_lookup(zd, od, count) != 0 || remove) &&
2265             (ztest_remove(zd, od, count) != 0 ||
2266             ztest_create(zd, od, count) != 0))
2267                 rv = -1;
2268         zd->zd_od = od;
2269         VERIFY(mutex_unlock(&zd->zd_dirobj_lock) == 0);
2270 
2271         return (rv);
2272 }
2273 
2274 /* ARGSUSED */
2275 void
2276 ztest_zil_commit(ztest_ds_t *zd, uint64_t id)
2277 {
2278         zilog_t *zilog = zd->zd_zilog;
2279 
2280         (void) rw_rdlock(&zd->zd_zilog_lock);
2281 
2282         zil_commit(zilog, ztest_random(ZTEST_OBJECTS));
2283 
2284         /*
2285          * Remember the committed values in zd, which is in parent/child
2286          * shared memory.  If we die, the next iteration of ztest_run()
2287          * will verify that the log really does contain this record.
2288          */
2289         mutex_enter(&zilog->zl_lock);
2290         ASSERT(zd->zd_shared != NULL);
2291         ASSERT3U(zd->zd_shared->zd_seq, <=, zilog->zl_commit_lr_seq);
2292         zd->zd_shared->zd_seq = zilog->zl_commit_lr_seq;
2293         mutex_exit(&zilog->zl_lock);
2294 
2295         (void) rw_unlock(&zd->zd_zilog_lock);
2296 }
2297 
2298 /*
2299  * This function is designed to simulate the operations that occur during a
2300  * mount/unmount operation.  We hold the dataset across these operations in an
2301  * attempt to expose any implicit assumptions about ZIL management.
2302  */
2303 /* ARGSUSED */
2304 void
2305 ztest_zil_remount(ztest_ds_t *zd, uint64_t id)
2306 {
2307         objset_t *os = zd->zd_os;
2308 
2309         /*
2310          * We grab the zd_dirobj_lock to ensure that no other thread is
2311          * updating the zil (i.e. adding in-memory log records) and the
2312          * zd_zilog_lock to block any I/O.
2313          */
2314         VERIFY0(mutex_lock(&zd->zd_dirobj_lock));
2315         (void) rw_wrlock(&zd->zd_zilog_lock);
2316 
2317         /* zfsvfs_teardown() */
2318         zil_close(zd->zd_zilog);
2319 
2320         /* zfsvfs_setup() */
2321         VERIFY(zil_open(os, ztest_get_data) == zd->zd_zilog);
2322         zil_replay(os, zd, ztest_replay_vector);
2323 
2324         (void) rw_unlock(&zd->zd_zilog_lock);
2325         VERIFY(mutex_unlock(&zd->zd_dirobj_lock) == 0);
2326 }
2327 
2328 /*
2329  * Verify that we can't destroy an active pool, create an existing pool,
2330  * or create a pool with a bad vdev spec.
2331  */
2332 /* ARGSUSED */
2333 void
2334 ztest_spa_create_destroy(ztest_ds_t *zd, uint64_t id)
2335 {
2336         ztest_shared_opts_t *zo = &ztest_opts;
2337         spa_t *spa;
2338         nvlist_t *nvroot;
2339 
2340         /*
2341          * Attempt to create using a bad file.
2342          */
2343         nvroot = make_vdev_root("/dev/bogus", NULL, NULL, 0, 0, 0, 0, 0, 1);
2344         VERIFY3U(ENOENT, ==,
2345             spa_create("ztest_bad_file", nvroot, NULL, NULL));
2346         nvlist_free(nvroot);
2347 
2348         /*
2349          * Attempt to create using a bad mirror.
2350          */
2351         nvroot = make_vdev_root("/dev/bogus", NULL, NULL, 0, 0, 0, 0, 2, 1);
2352         VERIFY3U(ENOENT, ==,
2353             spa_create("ztest_bad_mirror", nvroot, NULL, NULL));
2354         nvlist_free(nvroot);
2355 
2356         /*
2357          * Attempt to create an existing pool.  It shouldn't matter
2358          * what's in the nvroot; we should fail with EEXIST.
2359          */
2360         (void) rw_rdlock(&ztest_name_lock);
2361         nvroot = make_vdev_root("/dev/bogus", NULL, NULL, 0, 0, 0, 0, 0, 1);
2362         VERIFY3U(EEXIST, ==, spa_create(zo->zo_pool, nvroot, NULL, NULL));
2363         nvlist_free(nvroot);
2364         VERIFY3U(0, ==, spa_open(zo->zo_pool, &spa, FTAG));
2365         VERIFY3U(EBUSY, ==, spa_destroy(zo->zo_pool));
2366         spa_close(spa, FTAG);
2367 
2368         (void) rw_unlock(&ztest_name_lock);
2369 }
2370 
2371 /* ARGSUSED */
2372 void
2373 ztest_spa_upgrade(ztest_ds_t *zd, uint64_t id)
2374 {
2375         spa_t *spa;
2376         uint64_t initial_version = SPA_VERSION_INITIAL;
2377         uint64_t version, newversion;
2378         nvlist_t *nvroot, *props;
2379         char *name;
2380 
2381         VERIFY0(mutex_lock(&ztest_vdev_lock));
2382         name = kmem_asprintf("%s_upgrade", ztest_opts.zo_pool);
2383 
2384         /*
2385          * Clean up from previous runs.
2386          */
2387         (void) spa_destroy(name);
2388 
2389         nvroot = make_vdev_root(NULL, NULL, name, ztest_opts.zo_vdev_size, 0,
2390             0, ztest_opts.zo_raidz, ztest_opts.zo_mirrors, 1);
2391 
2392         /*
2393          * If we're configuring a RAIDZ device then make sure that the
2394          * the initial version is capable of supporting that feature.
2395          */
2396         switch (ztest_opts.zo_raidz_parity) {
2397         case 0:
2398         case 1:
2399                 initial_version = SPA_VERSION_INITIAL;
2400                 break;
2401         case 2:
2402                 initial_version = SPA_VERSION_RAIDZ2;
2403                 break;
2404         case 3:
2405                 initial_version = SPA_VERSION_RAIDZ3;
2406                 break;
2407         }
2408 
2409         /*
2410          * Create a pool with a spa version that can be upgraded. Pick
2411          * a value between initial_version and SPA_VERSION_BEFORE_FEATURES.
2412          */
2413         do {
2414                 version = ztest_random_spa_version(initial_version);
2415         } while (version > SPA_VERSION_BEFORE_FEATURES);
2416 
2417         props = fnvlist_alloc();
2418         fnvlist_add_uint64(props,
2419             zpool_prop_to_name(ZPOOL_PROP_VERSION), version);
2420         VERIFY0(spa_create(name, nvroot, props, NULL));
2421         fnvlist_free(nvroot);
2422         fnvlist_free(props);
2423 
2424         VERIFY0(spa_open(name, &spa, FTAG));
2425         VERIFY3U(spa_version(spa), ==, version);
2426         newversion = ztest_random_spa_version(version + 1);
2427 
2428         if (ztest_opts.zo_verbose >= 4) {
2429                 (void) printf("upgrading spa version from %llu to %llu\n",
2430                     (u_longlong_t)version, (u_longlong_t)newversion);
2431         }
2432 
2433         spa_upgrade(spa, newversion);
2434         VERIFY3U(spa_version(spa), >, version);
2435         VERIFY3U(spa_version(spa), ==, fnvlist_lookup_uint64(spa->spa_config,
2436             zpool_prop_to_name(ZPOOL_PROP_VERSION)));
2437         spa_close(spa, FTAG);
2438 
2439         strfree(name);
2440         VERIFY0(mutex_unlock(&ztest_vdev_lock));
2441 }
2442 
2443 static vdev_t *
2444 vdev_lookup_by_path(vdev_t *vd, const char *path)
2445 {
2446         vdev_t *mvd;
2447 
2448         if (vd->vdev_path != NULL && strcmp(path, vd->vdev_path) == 0)
2449                 return (vd);
2450 
2451         for (int c = 0; c < vd->vdev_children; c++)
2452                 if ((mvd = vdev_lookup_by_path(vd->vdev_child[c], path)) !=
2453                     NULL)
2454                         return (mvd);
2455 
2456         return (NULL);
2457 }
2458 
2459 /*
2460  * Find the first available hole which can be used as a top-level.
2461  */
2462 int
2463 find_vdev_hole(spa_t *spa)
2464 {
2465         vdev_t *rvd = spa->spa_root_vdev;
2466         int c;
2467 
2468         ASSERT(spa_config_held(spa, SCL_VDEV, RW_READER) == SCL_VDEV);
2469 
2470         for (c = 0; c < rvd->vdev_children; c++) {
2471                 vdev_t *cvd = rvd->vdev_child[c];
2472 
2473                 if (cvd->vdev_ishole)
2474                         break;
2475         }
2476         return (c);
2477 }
2478 
2479 /*
2480  * Verify that vdev_add() works as expected.
2481  */
2482 /* ARGSUSED */
2483 void
2484 ztest_vdev_add_remove(ztest_ds_t *zd, uint64_t id)
2485 {
2486         ztest_shared_t *zs = ztest_shared;
2487         spa_t *spa = ztest_spa;
2488         uint64_t leaves;
2489         uint64_t guid;
2490         nvlist_t *nvroot;
2491         int error;
2492 
2493         VERIFY(mutex_lock(&ztest_vdev_lock) == 0);
2494         leaves = MAX(zs->zs_mirrors + zs->zs_splits, 1) * ztest_opts.zo_raidz;
2495 
2496         spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
2497 
2498         ztest_shared->zs_vdev_next_leaf = find_vdev_hole(spa) * leaves;
2499 
2500         /*
2501          * If we have slogs then remove them 1/4 of the time.
2502          */
2503         if (spa_has_slogs(spa) && ztest_random(4) == 0) {
2504                 /*
2505                  * Grab the guid from the head of the log class rotor.
2506                  */
2507                 guid = spa_log_class(spa)->mc_rotor->mg_vd->vdev_guid;
2508 
2509                 spa_config_exit(spa, SCL_VDEV, FTAG);
2510 
2511                 /*
2512                  * We have to grab the zs_name_lock as writer to
2513                  * prevent a race between removing a slog (dmu_objset_find)
2514                  * and destroying a dataset. Removing the slog will
2515                  * grab a reference on the dataset which may cause
2516                  * dmu_objset_destroy() to fail with EBUSY thus
2517                  * leaving the dataset in an inconsistent state.
2518                  */
2519                 VERIFY(rw_wrlock(&ztest_name_lock) == 0);
2520                 error = spa_vdev_remove(spa, guid, B_FALSE);
2521                 VERIFY(rw_unlock(&ztest_name_lock) == 0);
2522 
2523                 if (error && error != EEXIST)
2524                         fatal(0, "spa_vdev_remove() = %d", error);
2525         } else {
2526                 spa_config_exit(spa, SCL_VDEV, FTAG);
2527 
2528                 /*
2529                  * Make 1/4 of the devices be log devices.
2530                  */
2531                 nvroot = make_vdev_root(NULL, NULL, NULL,
2532                     ztest_opts.zo_vdev_size, 0,
2533                     ztest_random(4) == 0, ztest_opts.zo_raidz,
2534                     zs->zs_mirrors, 1);
2535 
2536                 error = spa_vdev_add(spa, nvroot);
2537                 nvlist_free(nvroot);
2538 
2539                 if (error == ENOSPC)
2540                         ztest_record_enospc("spa_vdev_add");
2541                 else if (error != 0)
2542                         fatal(0, "spa_vdev_add() = %d", error);
2543         }
2544 
2545         VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
2546 }
2547 
2548 /*
2549  * Verify that adding/removing aux devices (l2arc, hot spare) works as expected.
2550  */
2551 /* ARGSUSED */
2552 void
2553 ztest_vdev_aux_add_remove(ztest_ds_t *zd, uint64_t id)
2554 {
2555         ztest_shared_t *zs = ztest_shared;
2556         spa_t *spa = ztest_spa;
2557         vdev_t *rvd = spa->spa_root_vdev;
2558         spa_aux_vdev_t *sav;
2559         char *aux;
2560         uint64_t guid = 0;
2561         int error;
2562 
2563         if (ztest_random(2) == 0) {
2564                 sav = &spa->spa_spares;
2565                 aux = ZPOOL_CONFIG_SPARES;
2566         } else {
2567                 sav = &spa->spa_l2cache;
2568                 aux = ZPOOL_CONFIG_L2CACHE;
2569         }
2570 
2571         VERIFY(mutex_lock(&ztest_vdev_lock) == 0);
2572 
2573         spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
2574 
2575         if (sav->sav_count != 0 && ztest_random(4) == 0) {
2576                 /*
2577                  * Pick a random device to remove.
2578                  */
2579                 guid = sav->sav_vdevs[ztest_random(sav->sav_count)]->vdev_guid;
2580         } else {
2581                 /*
2582                  * Find an unused device we can add.
2583                  */
2584                 zs->zs_vdev_aux = 0;
2585                 for (;;) {
2586                         char path[MAXPATHLEN];
2587                         int c;
2588                         (void) snprintf(path, sizeof (path), ztest_aux_template,
2589                             ztest_opts.zo_dir, ztest_opts.zo_pool, aux,
2590                             zs->zs_vdev_aux);
2591                         for (c = 0; c < sav->sav_count; c++)
2592                                 if (strcmp(sav->sav_vdevs[c]->vdev_path,
2593                                     path) == 0)
2594                                         break;
2595                         if (c == sav->sav_count &&
2596                             vdev_lookup_by_path(rvd, path) == NULL)
2597                                 break;
2598                         zs->zs_vdev_aux++;
2599                 }
2600         }
2601 
2602         spa_config_exit(spa, SCL_VDEV, FTAG);
2603 
2604         if (guid == 0) {
2605                 /*
2606                  * Add a new device.
2607                  */
2608                 nvlist_t *nvroot = make_vdev_root(NULL, aux, NULL,
2609                     (ztest_opts.zo_vdev_size * 5) / 4, 0, 0, 0, 0, 1);
2610                 error = spa_vdev_add(spa, nvroot);
2611                 if (error != 0)
2612                         fatal(0, "spa_vdev_add(%p) = %d", nvroot, error);
2613                 nvlist_free(nvroot);
2614         } else {
2615                 /*
2616                  * Remove an existing device.  Sometimes, dirty its
2617                  * vdev state first to make sure we handle removal
2618                  * of devices that have pending state changes.
2619                  */
2620                 if (ztest_random(2) == 0)
2621                         (void) vdev_online(spa, guid, 0, NULL);
2622 
2623                 error = spa_vdev_remove(spa, guid, B_FALSE);
2624                 if (error != 0 && error != EBUSY)
2625                         fatal(0, "spa_vdev_remove(%llu) = %d", guid, error);
2626         }
2627 
2628         VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
2629 }
2630 
2631 /*
2632  * split a pool if it has mirror tlvdevs
2633  */
2634 /* ARGSUSED */
2635 void
2636 ztest_split_pool(ztest_ds_t *zd, uint64_t id)
2637 {
2638         ztest_shared_t *zs = ztest_shared;
2639         spa_t *spa = ztest_spa;
2640         vdev_t *rvd = spa->spa_root_vdev;
2641         nvlist_t *tree, **child, *config, *split, **schild;
2642         uint_t c, children, schildren = 0, lastlogid = 0;
2643         int error = 0;
2644 
2645         VERIFY(mutex_lock(&ztest_vdev_lock) == 0);
2646 
2647         /* ensure we have a useable config; mirrors of raidz aren't supported */
2648         if (zs->zs_mirrors < 3 || ztest_opts.zo_raidz > 1) {
2649                 VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
2650                 return;
2651         }
2652 
2653         /* clean up the old pool, if any */
2654         (void) spa_destroy("splitp");
2655 
2656         spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
2657 
2658         /* generate a config from the existing config */
2659         mutex_enter(&spa->spa_props_lock);
2660         VERIFY(nvlist_lookup_nvlist(spa->spa_config, ZPOOL_CONFIG_VDEV_TREE,
2661             &tree) == 0);
2662         mutex_exit(&spa->spa_props_lock);
2663 
2664         VERIFY(nvlist_lookup_nvlist_array(tree, ZPOOL_CONFIG_CHILDREN, &child,
2665             &children) == 0);
2666 
2667         schild = malloc(rvd->vdev_children * sizeof (nvlist_t *));
2668         for (c = 0; c < children; c++) {
2669                 vdev_t *tvd = rvd->vdev_child[c];
2670                 nvlist_t **mchild;
2671                 uint_t mchildren;
2672 
2673                 if (tvd->vdev_islog || tvd->vdev_ops == &vdev_hole_ops) {
2674                         VERIFY(nvlist_alloc(&schild[schildren], NV_UNIQUE_NAME,
2675                             0) == 0);
2676                         VERIFY(nvlist_add_string(schild[schildren],
2677                             ZPOOL_CONFIG_TYPE, VDEV_TYPE_HOLE) == 0);
2678                         VERIFY(nvlist_add_uint64(schild[schildren],
2679                             ZPOOL_CONFIG_IS_HOLE, 1) == 0);
2680                         if (lastlogid == 0)
2681                                 lastlogid = schildren;
2682                         ++schildren;
2683                         continue;
2684                 }
2685                 lastlogid = 0;
2686                 VERIFY(nvlist_lookup_nvlist_array(child[c],
2687                     ZPOOL_CONFIG_CHILDREN, &mchild, &mchildren) == 0);
2688                 VERIFY(nvlist_dup(mchild[0], &schild[schildren++], 0) == 0);
2689         }
2690 
2691         /* OK, create a config that can be used to split */
2692         VERIFY(nvlist_alloc(&split, NV_UNIQUE_NAME, 0) == 0);
2693         VERIFY(nvlist_add_string(split, ZPOOL_CONFIG_TYPE,
2694             VDEV_TYPE_ROOT) == 0);
2695         VERIFY(nvlist_add_nvlist_array(split, ZPOOL_CONFIG_CHILDREN, schild,
2696             lastlogid != 0 ? lastlogid : schildren) == 0);
2697 
2698         VERIFY(nvlist_alloc(&config, NV_UNIQUE_NAME, 0) == 0);
2699         VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, split) == 0);
2700 
2701         for (c = 0; c < schildren; c++)
2702                 nvlist_free(schild[c]);
2703         free(schild);
2704         nvlist_free(split);
2705 
2706         spa_config_exit(spa, SCL_VDEV, FTAG);
2707 
2708         (void) rw_wrlock(&ztest_name_lock);
2709         error = spa_vdev_split_mirror(spa, "splitp", config, NULL, B_FALSE);
2710         (void) rw_unlock(&ztest_name_lock);
2711 
2712         nvlist_free(config);
2713 
2714         if (error == 0) {
2715                 (void) printf("successful split - results:\n");
2716                 mutex_enter(&spa_namespace_lock);
2717                 show_pool_stats(spa);
2718                 show_pool_stats(spa_lookup("splitp"));
2719                 mutex_exit(&spa_namespace_lock);
2720                 ++zs->zs_splits;
2721                 --zs->zs_mirrors;
2722         }
2723         VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
2724 
2725 }
2726 
2727 /*
2728  * Verify that we can attach and detach devices.
2729  */
2730 /* ARGSUSED */
2731 void
2732 ztest_vdev_attach_detach(ztest_ds_t *zd, uint64_t id)
2733 {
2734         ztest_shared_t *zs = ztest_shared;
2735         spa_t *spa = ztest_spa;
2736         spa_aux_vdev_t *sav = &spa->spa_spares;
2737         vdev_t *rvd = spa->spa_root_vdev;
2738         vdev_t *oldvd, *newvd, *pvd;
2739         nvlist_t *root;
2740         uint64_t leaves;
2741         uint64_t leaf, top;
2742         uint64_t ashift = ztest_get_ashift();
2743         uint64_t oldguid, pguid;
2744         uint64_t oldsize, newsize;
2745         char oldpath[MAXPATHLEN], newpath[MAXPATHLEN];
2746         int replacing;
2747         int oldvd_has_siblings = B_FALSE;
2748         int newvd_is_spare = B_FALSE;
2749         int oldvd_is_log;
2750         int error, expected_error;
2751 
2752         VERIFY(mutex_lock(&ztest_vdev_lock) == 0);
2753         leaves = MAX(zs->zs_mirrors, 1) * ztest_opts.zo_raidz;
2754 
2755         spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
2756 
2757         /*
2758          * Decide whether to do an attach or a replace.
2759          */
2760         replacing = ztest_random(2);
2761 
2762         /*
2763          * Pick a random top-level vdev.
2764          */
2765         top = ztest_random_vdev_top(spa, B_TRUE);
2766 
2767         /*
2768          * Pick a random leaf within it.
2769          */
2770         leaf = ztest_random(leaves);
2771 
2772         /*
2773          * Locate this vdev.
2774          */
2775         oldvd = rvd->vdev_child[top];
2776         if (zs->zs_mirrors >= 1) {
2777                 ASSERT(oldvd->vdev_ops == &vdev_mirror_ops);
2778                 ASSERT(oldvd->vdev_children >= zs->zs_mirrors);
2779                 oldvd = oldvd->vdev_child[leaf / ztest_opts.zo_raidz];
2780         }
2781         if (ztest_opts.zo_raidz > 1) {
2782                 ASSERT(oldvd->vdev_ops == &vdev_raidz_ops);
2783                 ASSERT(oldvd->vdev_children == ztest_opts.zo_raidz);
2784                 oldvd = oldvd->vdev_child[leaf % ztest_opts.zo_raidz];
2785         }
2786 
2787         /*
2788          * If we're already doing an attach or replace, oldvd may be a
2789          * mirror vdev -- in which case, pick a random child.
2790          */
2791         while (oldvd->vdev_children != 0) {
2792                 oldvd_has_siblings = B_TRUE;
2793                 ASSERT(oldvd->vdev_children >= 2);
2794                 oldvd = oldvd->vdev_child[ztest_random(oldvd->vdev_children)];
2795         }
2796 
2797         oldguid = oldvd->vdev_guid;
2798         oldsize = vdev_get_min_asize(oldvd);
2799         oldvd_is_log = oldvd->vdev_top->vdev_islog;
2800         (void) strcpy(oldpath, oldvd->vdev_path);
2801         pvd = oldvd->vdev_parent;
2802         pguid = pvd->vdev_guid;
2803 
2804         /*
2805          * If oldvd has siblings, then half of the time, detach it.
2806          */
2807         if (oldvd_has_siblings && ztest_random(2) == 0) {
2808                 spa_config_exit(spa, SCL_VDEV, FTAG);
2809                 error = spa_vdev_detach(spa, oldguid, pguid, B_FALSE);
2810                 if (error != 0 && error != ENODEV && error != EBUSY &&
2811                     error != ENOTSUP)
2812                         fatal(0, "detach (%s) returned %d", oldpath, error);
2813                 VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
2814                 return;
2815         }
2816 
2817         /*
2818          * For the new vdev, choose with equal probability between the two
2819          * standard paths (ending in either 'a' or 'b') or a random hot spare.
2820          */
2821         if (sav->sav_count != 0 && ztest_random(3) == 0) {
2822                 newvd = sav->sav_vdevs[ztest_random(sav->sav_count)];
2823                 newvd_is_spare = B_TRUE;
2824                 (void) strcpy(newpath, newvd->vdev_path);
2825         } else {
2826                 (void) snprintf(newpath, sizeof (newpath), ztest_dev_template,
2827                     ztest_opts.zo_dir, ztest_opts.zo_pool,
2828                     top * leaves + leaf);
2829                 if (ztest_random(2) == 0)
2830                         newpath[strlen(newpath) - 1] = 'b';
2831                 newvd = vdev_lookup_by_path(rvd, newpath);
2832         }
2833 
2834         if (newvd) {
2835                 newsize = vdev_get_min_asize(newvd);
2836         } else {
2837                 /*
2838                  * Make newsize a little bigger or smaller than oldsize.
2839                  * If it's smaller, the attach should fail.
2840                  * If it's larger, and we're doing a replace,
2841                  * we should get dynamic LUN growth when we're done.
2842                  */
2843                 newsize = 10 * oldsize / (9 + ztest_random(3));
2844         }
2845 
2846         /*
2847          * If pvd is not a mirror or root, the attach should fail with ENOTSUP,
2848          * unless it's a replace; in that case any non-replacing parent is OK.
2849          *
2850          * If newvd is already part of the pool, it should fail with EBUSY.
2851          *
2852          * If newvd is too small, it should fail with EOVERFLOW.
2853          */
2854         if (pvd->vdev_ops != &vdev_mirror_ops &&
2855             pvd->vdev_ops != &vdev_root_ops && (!replacing ||
2856             pvd->vdev_ops == &vdev_replacing_ops ||
2857             pvd->vdev_ops == &vdev_spare_ops))
2858                 expected_error = ENOTSUP;
2859         else if (newvd_is_spare && (!replacing || oldvd_is_log))
2860                 expected_error = ENOTSUP;
2861         else if (newvd == oldvd)
2862                 expected_error = replacing ? 0 : EBUSY;
2863         else if (vdev_lookup_by_path(rvd, newpath) != NULL)
2864                 expected_error = EBUSY;
2865         else if (newsize < oldsize)
2866                 expected_error = EOVERFLOW;
2867         else if (ashift > oldvd->vdev_top->vdev_ashift)
2868                 expected_error = EDOM;
2869         else
2870                 expected_error = 0;
2871 
2872         spa_config_exit(spa, SCL_VDEV, FTAG);
2873 
2874         /*
2875          * Build the nvlist describing newpath.
2876          */
2877         root = make_vdev_root(newpath, NULL, NULL, newvd == NULL ? newsize : 0,
2878             ashift, 0, 0, 0, 1);
2879 
2880         error = spa_vdev_attach(spa, oldguid, root, replacing);
2881 
2882         nvlist_free(root);
2883 
2884         /*
2885          * If our parent was the replacing vdev, but the replace completed,
2886          * then instead of failing with ENOTSUP we may either succeed,
2887          * fail with ENODEV, or fail with EOVERFLOW.
2888          */
2889         if (expected_error == ENOTSUP &&
2890             (error == 0 || error == ENODEV || error == EOVERFLOW))
2891                 expected_error = error;
2892 
2893         /*
2894          * If someone grew the LUN, the replacement may be too small.
2895          */
2896         if (error == EOVERFLOW || error == EBUSY)
2897                 expected_error = error;
2898 
2899         /* XXX workaround 6690467 */
2900         if (error != expected_error && expected_error != EBUSY) {
2901                 fatal(0, "attach (%s %llu, %s %llu, %d) "
2902                     "returned %d, expected %d",
2903                     oldpath, oldsize, newpath,
2904                     newsize, replacing, error, expected_error);
2905         }
2906 
2907         VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
2908 }
2909 
2910 /*
2911  * Callback function which expands the physical size of the vdev.
2912  */
2913 vdev_t *
2914 grow_vdev(vdev_t *vd, void *arg)
2915 {
2916         spa_t *spa = vd->vdev_spa;
2917         size_t *newsize = arg;
2918         size_t fsize;
2919         int fd;
2920 
2921         ASSERT(spa_config_held(spa, SCL_STATE, RW_READER) == SCL_STATE);
2922         ASSERT(vd->vdev_ops->vdev_op_leaf);
2923 
2924         if ((fd = open(vd->vdev_path, O_RDWR)) == -1)
2925                 return (vd);
2926 
2927         fsize = lseek(fd, 0, SEEK_END);
2928         (void) ftruncate(fd, *newsize);
2929 
2930         if (ztest_opts.zo_verbose >= 6) {
2931                 (void) printf("%s grew from %lu to %lu bytes\n",
2932                     vd->vdev_path, (ulong_t)fsize, (ulong_t)*newsize);
2933         }
2934         (void) close(fd);
2935         return (NULL);
2936 }
2937 
2938 /*
2939  * Callback function which expands a given vdev by calling vdev_online().
2940  */
2941 /* ARGSUSED */
2942 vdev_t *
2943 online_vdev(vdev_t *vd, void *arg)
2944 {
2945         spa_t *spa = vd->vdev_spa;
2946         vdev_t *tvd = vd->vdev_top;
2947         uint64_t guid = vd->vdev_guid;
2948         uint64_t generation = spa->spa_config_generation + 1;
2949         vdev_state_t newstate = VDEV_STATE_UNKNOWN;
2950         int error;
2951 
2952         ASSERT(spa_config_held(spa, SCL_STATE, RW_READER) == SCL_STATE);
2953         ASSERT(vd->vdev_ops->vdev_op_leaf);
2954 
2955         /* Calling vdev_online will initialize the new metaslabs */
2956         spa_config_exit(spa, SCL_STATE, spa);
2957         error = vdev_online(spa, guid, ZFS_ONLINE_EXPAND, &newstate);
2958         spa_config_enter(spa, SCL_STATE, spa, RW_READER);
2959 
2960         /*
2961          * If vdev_online returned an error or the underlying vdev_open
2962          * failed then we abort the expand. The only way to know that
2963          * vdev_open fails is by checking the returned newstate.
2964          */
2965         if (error || newstate != VDEV_STATE_HEALTHY) {
2966                 if (ztest_opts.zo_verbose >= 5) {
2967                         (void) printf("Unable to expand vdev, state %llu, "
2968                             "error %d\n", (u_longlong_t)newstate, error);
2969                 }
2970                 return (vd);
2971         }
2972         ASSERT3U(newstate, ==, VDEV_STATE_HEALTHY);
2973 
2974         /*
2975          * Since we dropped the lock we need to ensure that we're
2976          * still talking to the original vdev. It's possible this
2977          * vdev may have been detached/replaced while we were
2978          * trying to online it.
2979          */
2980         if (generation != spa->spa_config_generation) {
2981                 if (ztest_opts.zo_verbose >= 5) {
2982                         (void) printf("vdev configuration has changed, "
2983                             "guid %llu, state %llu, expected gen %llu, "
2984                             "got gen %llu\n",
2985                             (u_longlong_t)guid,
2986                             (u_longlong_t)tvd->vdev_state,
2987                             (u_longlong_t)generation,
2988                             (u_longlong_t)spa->spa_config_generation);
2989                 }
2990                 return (vd);
2991         }
2992         return (NULL);
2993 }
2994 
2995 /*
2996  * Traverse the vdev tree calling the supplied function.
2997  * We continue to walk the tree until we either have walked all
2998  * children or we receive a non-NULL return from the callback.
2999  * If a NULL callback is passed, then we just return back the first
3000  * leaf vdev we encounter.
3001  */
3002 vdev_t *
3003 vdev_walk_tree(vdev_t *vd, vdev_t *(*func)(vdev_t *, void *), void *arg)
3004 {
3005         if (vd->vdev_ops->vdev_op_leaf) {
3006                 if (func == NULL)
3007                         return (vd);
3008                 else
3009                         return (func(vd, arg));
3010         }
3011 
3012         for (uint_t c = 0; c < vd->vdev_children; c++) {
3013                 vdev_t *cvd = vd->vdev_child[c];
3014                 if ((cvd = vdev_walk_tree(cvd, func, arg)) != NULL)
3015                         return (cvd);
3016         }
3017         return (NULL);
3018 }
3019 
3020 /*
3021  * Verify that dynamic LUN growth works as expected.
3022  */
3023 /* ARGSUSED */
3024 void
3025 ztest_vdev_LUN_growth(ztest_ds_t *zd, uint64_t id)
3026 {
3027         spa_t *spa = ztest_spa;
3028         vdev_t *vd, *tvd;
3029         metaslab_class_t *mc;
3030         metaslab_group_t *mg;
3031         size_t psize, newsize;
3032         uint64_t top;
3033         uint64_t old_class_space, new_class_space, old_ms_count, new_ms_count;
3034 
3035         VERIFY(mutex_lock(&ztest_vdev_lock) == 0);
3036         spa_config_enter(spa, SCL_STATE, spa, RW_READER);
3037 
3038         top = ztest_random_vdev_top(spa, B_TRUE);
3039 
3040         tvd = spa->spa_root_vdev->vdev_child[top];
3041         mg = tvd->vdev_mg;
3042         mc = mg->mg_class;
3043         old_ms_count = tvd->vdev_ms_count;
3044         old_class_space = metaslab_class_get_space(mc);
3045 
3046         /*
3047          * Determine the size of the first leaf vdev associated with
3048          * our top-level device.
3049          */
3050         vd = vdev_walk_tree(tvd, NULL, NULL);
3051         ASSERT3P(vd, !=, NULL);
3052         ASSERT(vd->vdev_ops->vdev_op_leaf);
3053 
3054         psize = vd->vdev_psize;
3055 
3056         /*
3057          * We only try to expand the vdev if it's healthy, less than 4x its
3058          * original size, and it has a valid psize.
3059          */
3060         if (tvd->vdev_state != VDEV_STATE_HEALTHY ||
3061             psize == 0 || psize >= 4 * ztest_opts.zo_vdev_size) {
3062                 spa_config_exit(spa, SCL_STATE, spa);
3063                 VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
3064                 return;
3065         }
3066         ASSERT(psize > 0);
3067         newsize = psize + psize / 8;
3068         ASSERT3U(newsize, >, psize);
3069 
3070         if (ztest_opts.zo_verbose >= 6) {
3071                 (void) printf("Expanding LUN %s from %lu to %lu\n",
3072                     vd->vdev_path, (ulong_t)psize, (ulong_t)newsize);
3073         }
3074 
3075         /*
3076          * Growing the vdev is a two step process:
3077          *      1). expand the physical size (i.e. relabel)
3078          *      2). online the vdev to create the new metaslabs
3079          */
3080         if (vdev_walk_tree(tvd, grow_vdev, &newsize) != NULL ||
3081             vdev_walk_tree(tvd, online_vdev, NULL) != NULL ||
3082             tvd->vdev_state != VDEV_STATE_HEALTHY) {
3083                 if (ztest_opts.zo_verbose >= 5) {
3084                         (void) printf("Could not expand LUN because "
3085                             "the vdev configuration changed.\n");
3086                 }
3087                 spa_config_exit(spa, SCL_STATE, spa);
3088                 VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
3089                 return;
3090         }
3091 
3092         spa_config_exit(spa, SCL_STATE, spa);
3093 
3094         /*
3095          * Expanding the LUN will update the config asynchronously,
3096          * thus we must wait for the async thread to complete any
3097          * pending tasks before proceeding.
3098          */
3099         for (;;) {
3100                 boolean_t done;
3101                 mutex_enter(&spa->spa_async_lock);
3102                 done = (spa->spa_async_thread == NULL && !spa->spa_async_tasks);
3103                 mutex_exit(&spa->spa_async_lock);
3104                 if (done)
3105                         break;
3106                 txg_wait_synced(spa_get_dsl(spa), 0);
3107                 (void) poll(NULL, 0, 100);
3108         }
3109 
3110         spa_config_enter(spa, SCL_STATE, spa, RW_READER);
3111 
3112         tvd = spa->spa_root_vdev->vdev_child[top];
3113         new_ms_count = tvd->vdev_ms_count;
3114         new_class_space = metaslab_class_get_space(mc);
3115 
3116         if (tvd->vdev_mg != mg || mg->mg_class != mc) {
3117                 if (ztest_opts.zo_verbose >= 5) {
3118                         (void) printf("Could not verify LUN expansion due to "
3119                             "intervening vdev offline or remove.\n");
3120                 }
3121                 spa_config_exit(spa, SCL_STATE, spa);
3122                 VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
3123                 return;
3124         }
3125 
3126         /*
3127          * Make sure we were able to grow the vdev.
3128          */
3129         if (new_ms_count <= old_ms_count)
3130                 fatal(0, "LUN expansion failed: ms_count %llu <= %llu\n",
3131                     old_ms_count, new_ms_count);
3132 
3133         /*
3134          * Make sure we were able to grow the pool.
3135          */
3136         if (new_class_space <= old_class_space)
3137                 fatal(0, "LUN expansion failed: class_space %llu <= %llu\n",
3138                     old_class_space, new_class_space);
3139 
3140         if (ztest_opts.zo_verbose >= 5) {
3141                 char oldnumbuf[6], newnumbuf[6];
3142 
3143                 nicenum(old_class_space, oldnumbuf);
3144                 nicenum(new_class_space, newnumbuf);
3145                 (void) printf("%s grew from %s to %s\n",
3146                     spa->spa_name, oldnumbuf, newnumbuf);
3147         }
3148 
3149         spa_config_exit(spa, SCL_STATE, spa);
3150         VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
3151 }
3152 
3153 /*
3154  * Verify that dmu_objset_{create,destroy,open,close} work as expected.
3155  */
3156 /* ARGSUSED */
3157 static void
3158 ztest_objset_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
3159 {
3160         /*
3161          * Create the objects common to all ztest datasets.
3162          */
3163         VERIFY(zap_create_claim(os, ZTEST_DIROBJ,
3164             DMU_OT_ZAP_OTHER, DMU_OT_NONE, 0, tx) == 0);
3165 }
3166 
3167 static int
3168 ztest_dataset_create(char *dsname)
3169 {
3170         uint64_t zilset = ztest_random(100);
3171         int err = dmu_objset_create(dsname, DMU_OST_OTHER, 0,
3172             ztest_objset_create_cb, NULL);
3173 
3174         if (err || zilset < 80)
3175                 return (err);
3176 
3177         if (ztest_opts.zo_verbose >= 6)
3178                 (void) printf("Setting dataset %s to sync always\n", dsname);
3179         return (ztest_dsl_prop_set_uint64(dsname, ZFS_PROP_SYNC,
3180             ZFS_SYNC_ALWAYS, B_FALSE));
3181 }
3182 
3183 /* ARGSUSED */
3184 static int
3185 ztest_objset_destroy_cb(const char *name, void *arg)
3186 {
3187         objset_t *os;
3188         dmu_object_info_t doi;
3189         int error;
3190 
3191         /*
3192          * Verify that the dataset contains a directory object.
3193          */
3194         VERIFY0(dmu_objset_own(name, DMU_OST_OTHER, B_TRUE, FTAG, &os));
3195         error = dmu_object_info(os, ZTEST_DIROBJ, &doi);
3196         if (error != ENOENT) {
3197                 /* We could have crashed in the middle of destroying it */
3198                 ASSERT0(error);
3199                 ASSERT3U(doi.doi_type, ==, DMU_OT_ZAP_OTHER);
3200                 ASSERT3S(doi.doi_physical_blocks_512, >=, 0);
3201         }
3202         dmu_objset_disown(os, FTAG);
3203 
3204         /*
3205          * Destroy the dataset.
3206          */
3207         if (strchr(name, '@') != NULL) {
3208                 VERIFY0(dsl_destroy_snapshot(name, B_FALSE));
3209         } else {
3210                 VERIFY0(dsl_destroy_head(name));
3211         }
3212         return (0);
3213 }
3214 
3215 static boolean_t
3216 ztest_snapshot_create(char *osname, uint64_t id)
3217 {
3218         char snapname[MAXNAMELEN];
3219         int error;
3220 
3221         (void) snprintf(snapname, sizeof (snapname), "%llu", (u_longlong_t)id);
3222 
3223         error = dmu_objset_snapshot_one(osname, snapname);
3224         if (error == ENOSPC) {
3225                 ztest_record_enospc(FTAG);
3226                 return (B_FALSE);
3227         }
3228         if (error != 0 && error != EEXIST) {
3229                 fatal(0, "ztest_snapshot_create(%s@%s) = %d", osname,
3230                     snapname, error);
3231         }
3232         return (B_TRUE);
3233 }
3234 
3235 static boolean_t
3236 ztest_snapshot_destroy(char *osname, uint64_t id)
3237 {
3238         char snapname[MAXNAMELEN];
3239         int error;
3240 
3241         (void) snprintf(snapname, MAXNAMELEN, "%s@%llu", osname,
3242             (u_longlong_t)id);
3243 
3244         error = dsl_destroy_snapshot(snapname, B_FALSE);
3245         if (error != 0 && error != ENOENT)
3246                 fatal(0, "ztest_snapshot_destroy(%s) = %d", snapname, error);
3247         return (B_TRUE);
3248 }
3249 
3250 /* ARGSUSED */
3251 void
3252 ztest_dmu_objset_create_destroy(ztest_ds_t *zd, uint64_t id)
3253 {
3254         ztest_ds_t zdtmp;
3255         int iters;
3256         int error;
3257         objset_t *os, *os2;
3258         char name[MAXNAMELEN];
3259         zilog_t *zilog;
3260 
3261         (void) rw_rdlock(&ztest_name_lock);
3262 
3263         (void) snprintf(name, MAXNAMELEN, "%s/temp_%llu",
3264             ztest_opts.zo_pool, (u_longlong_t)id);
3265 
3266         /*
3267          * If this dataset exists from a previous run, process its replay log
3268          * half of the time.  If we don't replay it, then dmu_objset_destroy()
3269          * (invoked from ztest_objset_destroy_cb()) should just throw it away.
3270          */
3271         if (ztest_random(2) == 0 &&
3272             dmu_objset_own(name, DMU_OST_OTHER, B_FALSE, FTAG, &os) == 0) {
3273                 ztest_zd_init(&zdtmp, NULL, os);
3274                 zil_replay(os, &zdtmp, ztest_replay_vector);
3275                 ztest_zd_fini(&zdtmp);
3276                 dmu_objset_disown(os, FTAG);
3277         }
3278 
3279         /*
3280          * There may be an old instance of the dataset we're about to
3281          * create lying around from a previous run.  If so, destroy it
3282          * and all of its snapshots.
3283          */
3284         (void) dmu_objset_find(name, ztest_objset_destroy_cb, NULL,
3285             DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS);
3286 
3287         /*
3288          * Verify that the destroyed dataset is no longer in the namespace.
3289          */
3290         VERIFY3U(ENOENT, ==, dmu_objset_own(name, DMU_OST_OTHER, B_TRUE,
3291             FTAG, &os));
3292 
3293         /*
3294          * Verify that we can create a new dataset.
3295          */
3296         error = ztest_dataset_create(name);
3297         if (error) {
3298                 if (error == ENOSPC) {
3299                         ztest_record_enospc(FTAG);
3300                         (void) rw_unlock(&ztest_name_lock);
3301                         return;
3302                 }
3303                 fatal(0, "dmu_objset_create(%s) = %d", name, error);
3304         }
3305 
3306         VERIFY0(dmu_objset_own(name, DMU_OST_OTHER, B_FALSE, FTAG, &os));
3307 
3308         ztest_zd_init(&zdtmp, NULL, os);
3309 
3310         /*
3311          * Open the intent log for it.
3312          */
3313         zilog = zil_open(os, ztest_get_data);
3314 
3315         /*
3316          * Put some objects in there, do a little I/O to them,
3317          * and randomly take a couple of snapshots along the way.
3318          */
3319         iters = ztest_random(5);
3320         for (int i = 0; i < iters; i++) {
3321                 ztest_dmu_object_alloc_free(&zdtmp, id);
3322                 if (ztest_random(iters) == 0)
3323                         (void) ztest_snapshot_create(name, i);
3324         }
3325 
3326         /*
3327          * Verify that we cannot create an existing dataset.
3328          */
3329         VERIFY3U(EEXIST, ==,
3330             dmu_objset_create(name, DMU_OST_OTHER, 0, NULL, NULL));
3331 
3332         /*
3333          * Verify that we can hold an objset that is also owned.
3334          */
3335         VERIFY3U(0, ==, dmu_objset_hold(name, FTAG, &os2));
3336         dmu_objset_rele(os2, FTAG);
3337 
3338         /*
3339          * Verify that we cannot own an objset that is already owned.
3340          */
3341         VERIFY3U(EBUSY, ==,
3342             dmu_objset_own(name, DMU_OST_OTHER, B_FALSE, FTAG, &os2));
3343 
3344         zil_close(zilog);
3345         dmu_objset_disown(os, FTAG);
3346         ztest_zd_fini(&zdtmp);
3347 
3348         (void) rw_unlock(&ztest_name_lock);
3349 }
3350 
3351 /*
3352  * Verify that dmu_snapshot_{create,destroy,open,close} work as expected.
3353  */
3354 void
3355 ztest_dmu_snapshot_create_destroy(ztest_ds_t *zd, uint64_t id)
3356 {
3357         (void) rw_rdlock(&ztest_name_lock);
3358         (void) ztest_snapshot_destroy(zd->zd_name, id);
3359         (void) ztest_snapshot_create(zd->zd_name, id);
3360         (void) rw_unlock(&ztest_name_lock);
3361 }
3362 
3363 /*
3364  * Cleanup non-standard snapshots and clones.
3365  */
3366 void
3367 ztest_dsl_dataset_cleanup(char *osname, uint64_t id)
3368 {
3369         char snap1name[MAXNAMELEN];
3370         char clone1name[MAXNAMELEN];
3371         char snap2name[MAXNAMELEN];
3372         char clone2name[MAXNAMELEN];
3373         char snap3name[MAXNAMELEN];
3374         int error;
3375 
3376         (void) snprintf(snap1name, MAXNAMELEN, "%s@s1_%llu", osname, id);
3377         (void) snprintf(clone1name, MAXNAMELEN, "%s/c1_%llu", osname, id);
3378         (void) snprintf(snap2name, MAXNAMELEN, "%s@s2_%llu", clone1name, id);
3379         (void) snprintf(clone2name, MAXNAMELEN, "%s/c2_%llu", osname, id);
3380         (void) snprintf(snap3name, MAXNAMELEN, "%s@s3_%llu", clone1name, id);
3381 
3382         error = dsl_destroy_head(clone2name);
3383         if (error && error != ENOENT)
3384                 fatal(0, "dsl_destroy_head(%s) = %d", clone2name, error);
3385         error = dsl_destroy_snapshot(snap3name, B_FALSE);
3386         if (error && error != ENOENT)
3387                 fatal(0, "dsl_destroy_snapshot(%s) = %d", snap3name, error);
3388         error = dsl_destroy_snapshot(snap2name, B_FALSE);
3389         if (error && error != ENOENT)
3390                 fatal(0, "dsl_destroy_snapshot(%s) = %d", snap2name, error);
3391         error = dsl_destroy_head(clone1name);
3392         if (error && error != ENOENT)
3393                 fatal(0, "dsl_destroy_head(%s) = %d", clone1name, error);
3394         error = dsl_destroy_snapshot(snap1name, B_FALSE);
3395         if (error && error != ENOENT)
3396                 fatal(0, "dsl_destroy_snapshot(%s) = %d", snap1name, error);
3397 }
3398 
3399 /*
3400  * Verify dsl_dataset_promote handles EBUSY
3401  */
3402 void
3403 ztest_dsl_dataset_promote_busy(ztest_ds_t *zd, uint64_t id)
3404 {
3405         objset_t *os;
3406         char snap1name[MAXNAMELEN];
3407         char clone1name[MAXNAMELEN];
3408         char snap2name[MAXNAMELEN];
3409         char clone2name[MAXNAMELEN];
3410         char snap3name[MAXNAMELEN];
3411         char *osname = zd->zd_name;
3412         int error;
3413 
3414         (void) rw_rdlock(&ztest_name_lock);
3415 
3416         ztest_dsl_dataset_cleanup(osname, id);
3417 
3418         (void) snprintf(snap1name, MAXNAMELEN, "%s@s1_%llu", osname, id);
3419         (void) snprintf(clone1name, MAXNAMELEN, "%s/c1_%llu", osname, id);
3420         (void) snprintf(snap2name, MAXNAMELEN, "%s@s2_%llu", clone1name, id);
3421         (void) snprintf(clone2name, MAXNAMELEN, "%s/c2_%llu", osname, id);
3422         (void) snprintf(snap3name, MAXNAMELEN, "%s@s3_%llu", clone1name, id);
3423 
3424         error = dmu_objset_snapshot_one(osname, strchr(snap1name, '@') + 1);
3425         if (error && error != EEXIST) {
3426                 if (error == ENOSPC) {
3427                         ztest_record_enospc(FTAG);
3428                         goto out;
3429                 }
3430                 fatal(0, "dmu_take_snapshot(%s) = %d", snap1name, error);
3431         }
3432 
3433         error = dmu_objset_clone(clone1name, snap1name);
3434         if (error) {
3435                 if (error == ENOSPC) {
3436                         ztest_record_enospc(FTAG);
3437                         goto out;
3438                 }
3439                 fatal(0, "dmu_objset_create(%s) = %d", clone1name, error);
3440         }
3441 
3442         error = dmu_objset_snapshot_one(clone1name, strchr(snap2name, '@') + 1);
3443         if (error && error != EEXIST) {
3444                 if (error == ENOSPC) {
3445                         ztest_record_enospc(FTAG);
3446                         goto out;
3447                 }
3448                 fatal(0, "dmu_open_snapshot(%s) = %d", snap2name, error);
3449         }
3450 
3451         error = dmu_objset_snapshot_one(clone1name, strchr(snap3name, '@') + 1);
3452         if (error && error != EEXIST) {
3453                 if (error == ENOSPC) {
3454                         ztest_record_enospc(FTAG);
3455                         goto out;
3456                 }
3457                 fatal(0, "dmu_open_snapshot(%s) = %d", snap3name, error);
3458         }
3459 
3460         error = dmu_objset_clone(clone2name, snap3name);
3461         if (error) {
3462                 if (error == ENOSPC) {
3463                         ztest_record_enospc(FTAG);
3464                         goto out;
3465                 }
3466                 fatal(0, "dmu_objset_create(%s) = %d", clone2name, error);
3467         }
3468 
3469         error = dmu_objset_own(snap2name, DMU_OST_ANY, B_TRUE, FTAG, &os);
3470         if (error)
3471                 fatal(0, "dmu_objset_own(%s) = %d", snap2name, error);
3472         error = dsl_dataset_promote(clone2name, NULL);
3473         if (error != EBUSY)
3474                 fatal(0, "dsl_dataset_promote(%s), %d, not EBUSY", clone2name,
3475                     error);
3476         dmu_objset_disown(os, FTAG);
3477 
3478 out:
3479         ztest_dsl_dataset_cleanup(osname, id);
3480 
3481         (void) rw_unlock(&ztest_name_lock);
3482 }
3483 
3484 /*
3485  * Verify that dmu_object_{alloc,free} work as expected.
3486  */
3487 void
3488 ztest_dmu_object_alloc_free(ztest_ds_t *zd, uint64_t id)
3489 {
3490         ztest_od_t od[4];
3491         int batchsize = sizeof (od) / sizeof (od[0]);
3492 
3493         for (int b = 0; b < batchsize; b++)
3494                 ztest_od_init(&od[b], id, FTAG, b, DMU_OT_UINT64_OTHER, 0, 0);
3495 
3496         /*
3497          * Destroy the previous batch of objects, create a new batch,
3498          * and do some I/O on the new objects.
3499          */
3500         if (ztest_object_init(zd, od, sizeof (od), B_TRUE) != 0)
3501                 return;
3502 
3503         while (ztest_random(4 * batchsize) != 0)
3504                 ztest_io(zd, od[ztest_random(batchsize)].od_object,
3505                     ztest_random(ZTEST_RANGE_LOCKS) << SPA_MAXBLOCKSHIFT);
3506 }
3507 
3508 /*
3509  * Verify that dmu_{read,write} work as expected.
3510  */
3511 void
3512 ztest_dmu_read_write(ztest_ds_t *zd, uint64_t id)
3513 {
3514         objset_t *os = zd->zd_os;
3515         ztest_od_t od[2];
3516         dmu_tx_t *tx;
3517         int i, freeit, error;
3518         uint64_t n, s, txg;
3519         bufwad_t *packbuf, *bigbuf, *pack, *bigH, *bigT;
3520         uint64_t packobj, packoff, packsize, bigobj, bigoff, bigsize;
3521         uint64_t chunksize = (1000 + ztest_random(1000)) * sizeof (uint64_t);
3522         uint64_t regions = 997;
3523         uint64_t stride = 123456789ULL;
3524         uint64_t width = 40;
3525         int free_percent = 5;
3526 
3527         /*
3528          * This test uses two objects, packobj and bigobj, that are always
3529          * updated together (i.e. in the same tx) so that their contents are
3530          * in sync and can be compared.  Their contents relate to each other
3531          * in a simple way: packobj is a dense array of 'bufwad' structures,
3532          * while bigobj is a sparse array of the same bufwads.  Specifically,
3533          * for any index n, there are three bufwads that should be identical:
3534          *
3535          *      packobj, at offset n * sizeof (bufwad_t)
3536          *      bigobj, at the head of the nth chunk
3537          *      bigobj, at the tail of the nth chunk
3538          *
3539          * The chunk size is arbitrary. It doesn't have to be a power of two,
3540          * and it doesn't have any relation to the object blocksize.
3541          * The only requirement is that it can hold at least two bufwads.
3542          *
3543          * Normally, we write the bufwad to each of these locations.
3544          * However, free_percent of the time we instead write zeroes to
3545          * packobj and perform a dmu_free_range() on bigobj.  By comparing
3546          * bigobj to packobj, we can verify that the DMU is correctly
3547          * tracking which parts of an object are allocated and free,
3548          * and that the contents of the allocated blocks are correct.
3549          */
3550 
3551         /*
3552          * Read the directory info.  If it's the first time, set things up.
3553          */
3554         ztest_od_init(&od[0], id, FTAG, 0, DMU_OT_UINT64_OTHER, 0, chunksize);
3555         ztest_od_init(&od[1], id, FTAG, 1, DMU_OT_UINT64_OTHER, 0, chunksize);
3556 
3557         if (ztest_object_init(zd, od, sizeof (od), B_FALSE) != 0)
3558                 return;
3559 
3560         bigobj = od[0].od_object;
3561         packobj = od[1].od_object;
3562         chunksize = od[0].od_gen;
3563         ASSERT(chunksize == od[1].od_gen);
3564 
3565         /*
3566          * Prefetch a random chunk of the big object.
3567          * Our aim here is to get some async reads in flight
3568          * for blocks that we may free below; the DMU should
3569          * handle this race correctly.
3570          */
3571         n = ztest_random(regions) * stride + ztest_random(width);
3572         s = 1 + ztest_random(2 * width - 1);
3573         dmu_prefetch(os, bigobj, n * chunksize, s * chunksize);
3574 
3575         /*
3576          * Pick a random index and compute the offsets into packobj and bigobj.
3577          */
3578         n = ztest_random(regions) * stride + ztest_random(width);
3579         s = 1 + ztest_random(width - 1);
3580 
3581         packoff = n * sizeof (bufwad_t);
3582         packsize = s * sizeof (bufwad_t);
3583 
3584         bigoff = n * chunksize;
3585         bigsize = s * chunksize;
3586 
3587         packbuf = umem_alloc(packsize, UMEM_NOFAIL);
3588         bigbuf = umem_alloc(bigsize, UMEM_NOFAIL);
3589 
3590         /*
3591          * free_percent of the time, free a range of bigobj rather than
3592          * overwriting it.
3593          */
3594         freeit = (ztest_random(100) < free_percent);
3595 
3596         /*
3597          * Read the current contents of our objects.
3598          */
3599         error = dmu_read(os, packobj, packoff, packsize, packbuf,
3600             DMU_READ_PREFETCH);
3601         ASSERT0(error);
3602         error = dmu_read(os, bigobj, bigoff, bigsize, bigbuf,
3603             DMU_READ_PREFETCH);
3604         ASSERT0(error);
3605 
3606         /*
3607          * Get a tx for the mods to both packobj and bigobj.
3608          */
3609         tx = dmu_tx_create(os);
3610 
3611         dmu_tx_hold_write(tx, packobj, packoff, packsize);
3612 
3613         if (freeit)
3614                 dmu_tx_hold_free(tx, bigobj, bigoff, bigsize);
3615         else
3616                 dmu_tx_hold_write(tx, bigobj, bigoff, bigsize);
3617 
3618         /* This accounts for setting the checksum/compression. */
3619         dmu_tx_hold_bonus(tx, bigobj);
3620 
3621         txg = ztest_tx_assign(tx, TXG_MIGHTWAIT, FTAG);
3622         if (txg == 0) {
3623                 umem_free(packbuf, packsize);
3624                 umem_free(bigbuf, bigsize);
3625                 return;
3626         }
3627 
3628         dmu_object_set_checksum(os, bigobj,
3629             (enum zio_checksum)ztest_random_dsl_prop(ZFS_PROP_CHECKSUM), tx);
3630 
3631         dmu_object_set_compress(os, bigobj,
3632             (enum zio_compress)ztest_random_dsl_prop(ZFS_PROP_COMPRESSION), tx);
3633 
3634         /*
3635          * For each index from n to n + s, verify that the existing bufwad
3636          * in packobj matches the bufwads at the head and tail of the
3637          * corresponding chunk in bigobj.  Then update all three bufwads
3638          * with the new values we want to write out.
3639          */
3640         for (i = 0; i < s; i++) {
3641                 /* LINTED */
3642                 pack = (bufwad_t *)((char *)packbuf + i * sizeof (bufwad_t));
3643                 /* LINTED */
3644                 bigH = (bufwad_t *)((char *)bigbuf + i * chunksize);
3645                 /* LINTED */
3646                 bigT = (bufwad_t *)((char *)bigH + chunksize) - 1;
3647 
3648                 ASSERT((uintptr_t)bigH - (uintptr_t)bigbuf < bigsize);
3649                 ASSERT((uintptr_t)bigT - (uintptr_t)bigbuf < bigsize);
3650 
3651                 if (pack->bw_txg > txg)
3652                         fatal(0, "future leak: got %llx, open txg is %llx",
3653                             pack->bw_txg, txg);
3654 
3655                 if (pack->bw_data != 0 && pack->bw_index != n + i)
3656                         fatal(0, "wrong index: got %llx, wanted %llx+%llx",
3657                             pack->bw_index, n, i);
3658 
3659                 if (bcmp(pack, bigH, sizeof (bufwad_t)) != 0)
3660                         fatal(0, "pack/bigH mismatch in %p/%p", pack, bigH);
3661 
3662                 if (bcmp(pack, bigT, sizeof (bufwad_t)) != 0)
3663                         fatal(0, "pack/bigT mismatch in %p/%p", pack, bigT);
3664 
3665                 if (freeit) {
3666                         bzero(pack, sizeof (bufwad_t));
3667                 } else {
3668                         pack->bw_index = n + i;
3669                         pack->bw_txg = txg;
3670                         pack->bw_data = 1 + ztest_random(-2ULL);
3671                 }
3672                 *bigH = *pack;
3673                 *bigT = *pack;
3674         }
3675 
3676         /*
3677          * We've verified all the old bufwads, and made new ones.
3678          * Now write them out.
3679          */
3680         dmu_write(os, packobj, packoff, packsize, packbuf, tx);
3681 
3682         if (freeit) {
3683                 if (ztest_opts.zo_verbose >= 7) {
3684                         (void) printf("freeing offset %llx size %llx"
3685                             " txg %llx\n",
3686                             (u_longlong_t)bigoff,
3687                             (u_longlong_t)bigsize,
3688                             (u_longlong_t)txg);
3689                 }
3690                 VERIFY(0 == dmu_free_range(os, bigobj, bigoff, bigsize, tx));
3691         } else {
3692                 if (ztest_opts.zo_verbose >= 7) {
3693                         (void) printf("writing offset %llx size %llx"
3694                             " txg %llx\n",
3695                             (u_longlong_t)bigoff,
3696                             (u_longlong_t)bigsize,
3697                             (u_longlong_t)txg);
3698                 }
3699                 dmu_write(os, bigobj, bigoff, bigsize, bigbuf, tx);
3700         }
3701 
3702         dmu_tx_commit(tx);
3703 
3704         /*
3705          * Sanity check the stuff we just wrote.
3706          */
3707         {
3708                 void *packcheck = umem_alloc(packsize, UMEM_NOFAIL);
3709                 void *bigcheck = umem_alloc(bigsize, UMEM_NOFAIL);
3710 
3711                 VERIFY(0 == dmu_read(os, packobj, packoff,
3712                     packsize, packcheck, DMU_READ_PREFETCH));
3713                 VERIFY(0 == dmu_read(os, bigobj, bigoff,
3714                     bigsize, bigcheck, DMU_READ_PREFETCH));
3715 
3716                 ASSERT(bcmp(packbuf, packcheck, packsize) == 0);
3717                 ASSERT(bcmp(bigbuf, bigcheck, bigsize) == 0);
3718 
3719                 umem_free(packcheck, packsize);
3720                 umem_free(bigcheck, bigsize);
3721         }
3722 
3723         umem_free(packbuf, packsize);
3724         umem_free(bigbuf, bigsize);
3725 }
3726 
3727 void
3728 compare_and_update_pbbufs(uint64_t s, bufwad_t *packbuf, bufwad_t *bigbuf,
3729     uint64_t bigsize, uint64_t n, uint64_t chunksize, uint64_t txg)
3730 {
3731         uint64_t i;
3732         bufwad_t *pack;
3733         bufwad_t *bigH;
3734         bufwad_t *bigT;
3735 
3736         /*
3737          * For each index from n to n + s, verify that the existing bufwad
3738          * in packobj matches the bufwads at the head and tail of the
3739          * corresponding chunk in bigobj.  Then update all three bufwads
3740          * with the new values we want to write out.
3741          */
3742         for (i = 0; i < s; i++) {
3743                 /* LINTED */
3744                 pack = (bufwad_t *)((char *)packbuf + i * sizeof (bufwad_t));
3745                 /* LINTED */
3746                 bigH = (bufwad_t *)((char *)bigbuf + i * chunksize);
3747                 /* LINTED */
3748                 bigT = (bufwad_t *)((char *)bigH + chunksize) - 1;
3749 
3750                 ASSERT((uintptr_t)bigH - (uintptr_t)bigbuf < bigsize);
3751                 ASSERT((uintptr_t)bigT - (uintptr_t)bigbuf < bigsize);
3752 
3753                 if (pack->bw_txg > txg)
3754                         fatal(0, "future leak: got %llx, open txg is %llx",
3755                             pack->bw_txg, txg);
3756 
3757                 if (pack->bw_data != 0 && pack->bw_index != n + i)
3758                         fatal(0, "wrong index: got %llx, wanted %llx+%llx",
3759                             pack->bw_index, n, i);
3760 
3761                 if (bcmp(pack, bigH, sizeof (bufwad_t)) != 0)
3762                         fatal(0, "pack/bigH mismatch in %p/%p", pack, bigH);
3763 
3764                 if (bcmp(pack, bigT, sizeof (bufwad_t)) != 0)
3765                         fatal(0, "pack/bigT mismatch in %p/%p", pack, bigT);
3766 
3767                 pack->bw_index = n + i;
3768                 pack->bw_txg = txg;
3769                 pack->bw_data = 1 + ztest_random(-2ULL);
3770 
3771                 *bigH = *pack;
3772                 *bigT = *pack;
3773         }
3774 }
3775 
3776 void
3777 ztest_dmu_read_write_zcopy(ztest_ds_t *zd, uint64_t id)
3778 {
3779         objset_t *os = zd->zd_os;
3780         ztest_od_t od[2];
3781         dmu_tx_t *tx;
3782         uint64_t i;
3783         int error;
3784         uint64_t n, s, txg;
3785         bufwad_t *packbuf, *bigbuf;
3786         uint64_t packobj, packoff, packsize, bigobj, bigoff, bigsize;
3787         uint64_t blocksize = ztest_random_blocksize();
3788         uint64_t chunksize = blocksize;
3789         uint64_t regions = 997;
3790         uint64_t stride = 123456789ULL;
3791         uint64_t width = 9;
3792         dmu_buf_t *bonus_db;
3793         arc_buf_t **bigbuf_arcbufs;
3794         dmu_object_info_t doi;
3795 
3796         /*
3797          * This test uses two objects, packobj and bigobj, that are always
3798          * updated together (i.e. in the same tx) so that their contents are
3799          * in sync and can be compared.  Their contents relate to each other
3800          * in a simple way: packobj is a dense array of 'bufwad' structures,
3801          * while bigobj is a sparse array of the same bufwads.  Specifically,
3802          * for any index n, there are three bufwads that should be identical:
3803          *
3804          *      packobj, at offset n * sizeof (bufwad_t)
3805          *      bigobj, at the head of the nth chunk
3806          *      bigobj, at the tail of the nth chunk
3807          *
3808          * The chunk size is set equal to bigobj block size so that
3809          * dmu_assign_arcbuf() can be tested for object updates.
3810          */
3811 
3812         /*
3813          * Read the directory info.  If it's the first time, set things up.
3814          */
3815         ztest_od_init(&od[0], id, FTAG, 0, DMU_OT_UINT64_OTHER, blocksize, 0);
3816         ztest_od_init(&od[1], id, FTAG, 1, DMU_OT_UINT64_OTHER, 0, chunksize);
3817 
3818         if (ztest_object_init(zd, od, sizeof (od), B_FALSE) != 0)
3819                 return;
3820 
3821         bigobj = od[0].od_object;
3822         packobj = od[1].od_object;
3823         blocksize = od[0].od_blocksize;
3824         chunksize = blocksize;
3825         ASSERT(chunksize == od[1].od_gen);
3826 
3827         VERIFY(dmu_object_info(os, bigobj, &doi) == 0);
3828         VERIFY(ISP2(doi.doi_data_block_size));
3829         VERIFY(chunksize == doi.doi_data_block_size);
3830         VERIFY(chunksize >= 2 * sizeof (bufwad_t));
3831 
3832         /*
3833          * Pick a random index and compute the offsets into packobj and bigobj.
3834          */
3835         n = ztest_random(regions) * stride + ztest_random(width);
3836         s = 1 + ztest_random(width - 1);
3837 
3838         packoff = n * sizeof (bufwad_t);
3839         packsize = s * sizeof (bufwad_t);
3840 
3841         bigoff = n * chunksize;
3842         bigsize = s * chunksize;
3843 
3844         packbuf = umem_zalloc(packsize, UMEM_NOFAIL);
3845         bigbuf = umem_zalloc(bigsize, UMEM_NOFAIL);
3846 
3847         VERIFY3U(0, ==, dmu_bonus_hold(os, bigobj, FTAG, &bonus_db));
3848 
3849         bigbuf_arcbufs = umem_zalloc(2 * s * sizeof (arc_buf_t *), UMEM_NOFAIL);
3850 
3851         /*
3852          * Iteration 0 test zcopy for DB_UNCACHED dbufs.
3853          * Iteration 1 test zcopy to already referenced dbufs.
3854          * Iteration 2 test zcopy to dirty dbuf in the same txg.
3855          * Iteration 3 test zcopy to dbuf dirty in previous txg.
3856          * Iteration 4 test zcopy when dbuf is no longer dirty.
3857          * Iteration 5 test zcopy when it can't be done.
3858          * Iteration 6 one more zcopy write.
3859          */
3860         for (i = 0; i < 7; i++) {
3861                 uint64_t j;
3862                 uint64_t off;
3863 
3864                 /*
3865                  * In iteration 5 (i == 5) use arcbufs
3866                  * that don't match bigobj blksz to test
3867                  * dmu_assign_arcbuf() when it can't directly
3868                  * assign an arcbuf to a dbuf.
3869                  */
3870                 for (j = 0; j < s; j++) {
3871                         if (i != 5) {
3872                                 bigbuf_arcbufs[j] =
3873                                     dmu_request_arcbuf(bonus_db, chunksize);
3874                         } else {
3875                                 bigbuf_arcbufs[2 * j] =
3876                                     dmu_request_arcbuf(bonus_db, chunksize / 2);
3877                                 bigbuf_arcbufs[2 * j + 1] =
3878                                     dmu_request_arcbuf(bonus_db, chunksize / 2);
3879                         }
3880                 }
3881 
3882                 /*
3883                  * Get a tx for the mods to both packobj and bigobj.
3884                  */
3885                 tx = dmu_tx_create(os);
3886 
3887                 dmu_tx_hold_write(tx, packobj, packoff, packsize);
3888                 dmu_tx_hold_write(tx, bigobj, bigoff, bigsize);
3889 
3890                 txg = ztest_tx_assign(tx, TXG_MIGHTWAIT, FTAG);
3891                 if (txg == 0) {
3892                         umem_free(packbuf, packsize);
3893                         umem_free(bigbuf, bigsize);
3894                         for (j = 0; j < s; j++) {
3895                                 if (i != 5) {
3896                                         dmu_return_arcbuf(bigbuf_arcbufs[j]);
3897                                 } else {
3898                                         dmu_return_arcbuf(
3899                                             bigbuf_arcbufs[2 * j]);
3900                                         dmu_return_arcbuf(
3901                                             bigbuf_arcbufs[2 * j + 1]);
3902                                 }
3903                         }
3904                         umem_free(bigbuf_arcbufs, 2 * s * sizeof (arc_buf_t *));
3905                         dmu_buf_rele(bonus_db, FTAG);
3906                         return;
3907                 }
3908 
3909                 /*
3910                  * 50% of the time don't read objects in the 1st iteration to
3911                  * test dmu_assign_arcbuf() for the case when there're no
3912                  * existing dbufs for the specified offsets.
3913                  */
3914                 if (i != 0 || ztest_random(2) != 0) {
3915                         error = dmu_read(os, packobj, packoff,
3916                             packsize, packbuf, DMU_READ_PREFETCH);
3917                         ASSERT0(error);
3918                         error = dmu_read(os, bigobj, bigoff, bigsize,
3919                             bigbuf, DMU_READ_PREFETCH);
3920                         ASSERT0(error);
3921                 }
3922                 compare_and_update_pbbufs(s, packbuf, bigbuf, bigsize,
3923                     n, chunksize, txg);
3924 
3925                 /*
3926                  * We've verified all the old bufwads, and made new ones.
3927                  * Now write them out.
3928                  */
3929                 dmu_write(os, packobj, packoff, packsize, packbuf, tx);
3930                 if (ztest_opts.zo_verbose >= 7) {
3931                         (void) printf("writing offset %llx size %llx"
3932                             " txg %llx\n",
3933                             (u_longlong_t)bigoff,
3934                             (u_longlong_t)bigsize,
3935                             (u_longlong_t)txg);
3936                 }
3937                 for (off = bigoff, j = 0; j < s; j++, off += chunksize) {
3938                         dmu_buf_t *dbt;
3939                         if (i != 5) {
3940                                 bcopy((caddr_t)bigbuf + (off - bigoff),
3941                                     bigbuf_arcbufs[j]->b_data, chunksize);
3942                         } else {
3943                                 bcopy((caddr_t)bigbuf + (off - bigoff),
3944                                     bigbuf_arcbufs[2 * j]->b_data,
3945                                     chunksize / 2);
3946                                 bcopy((caddr_t)bigbuf + (off - bigoff) +
3947                                     chunksize / 2,
3948                                     bigbuf_arcbufs[2 * j + 1]->b_data,
3949                                     chunksize / 2);
3950                         }
3951 
3952                         if (i == 1) {
3953                                 VERIFY(dmu_buf_hold(os, bigobj, off,
3954                                     FTAG, &dbt, DMU_READ_NO_PREFETCH) == 0);
3955                         }
3956                         if (i != 5) {
3957                                 dmu_assign_arcbuf(bonus_db, off,
3958                                     bigbuf_arcbufs[j], tx);
3959                         } else {
3960                                 dmu_assign_arcbuf(bonus_db, off,
3961                                     bigbuf_arcbufs[2 * j], tx);
3962                                 dmu_assign_arcbuf(bonus_db,
3963                                     off + chunksize / 2,
3964                                     bigbuf_arcbufs[2 * j + 1], tx);
3965                         }
3966                         if (i == 1) {
3967                                 dmu_buf_rele(dbt, FTAG);
3968                         }
3969                 }
3970                 dmu_tx_commit(tx);
3971 
3972                 /*
3973                  * Sanity check the stuff we just wrote.
3974                  */
3975                 {
3976                         void *packcheck = umem_alloc(packsize, UMEM_NOFAIL);
3977                         void *bigcheck = umem_alloc(bigsize, UMEM_NOFAIL);
3978 
3979                         VERIFY(0 == dmu_read(os, packobj, packoff,
3980                             packsize, packcheck, DMU_READ_PREFETCH));
3981                         VERIFY(0 == dmu_read(os, bigobj, bigoff,
3982                             bigsize, bigcheck, DMU_READ_PREFETCH));
3983 
3984                         ASSERT(bcmp(packbuf, packcheck, packsize) == 0);
3985                         ASSERT(bcmp(bigbuf, bigcheck, bigsize) == 0);
3986 
3987                         umem_free(packcheck, packsize);
3988                         umem_free(bigcheck, bigsize);
3989                 }
3990                 if (i == 2) {
3991                         txg_wait_open(dmu_objset_pool(os), 0);
3992                 } else if (i == 3) {
3993                         txg_wait_synced(dmu_objset_pool(os), 0);
3994                 }
3995         }
3996 
3997         dmu_buf_rele(bonus_db, FTAG);
3998         umem_free(packbuf, packsize);
3999         umem_free(bigbuf, bigsize);
4000         umem_free(bigbuf_arcbufs, 2 * s * sizeof (arc_buf_t *));
4001 }
4002 
4003 /* ARGSUSED */
4004 void
4005 ztest_dmu_write_parallel(ztest_ds_t *zd, uint64_t id)
4006 {
4007         ztest_od_t od[1];
4008         uint64_t offset = (1ULL << (ztest_random(20) + 43)) +
4009             (ztest_random(ZTEST_RANGE_LOCKS) << SPA_MAXBLOCKSHIFT);
4010 
4011         /*
4012          * Have multiple threads write to large offsets in an object
4013          * to verify that parallel writes to an object -- even to the
4014          * same blocks within the object -- doesn't cause any trouble.
4015          */
4016         ztest_od_init(&od[0], ID_PARALLEL, FTAG, 0, DMU_OT_UINT64_OTHER, 0, 0);
4017 
4018         if (ztest_object_init(zd, od, sizeof (od), B_FALSE) != 0)
4019                 return;
4020 
4021         while (ztest_random(10) != 0)
4022                 ztest_io(zd, od[0].od_object, offset);
4023 }
4024 
4025 void
4026 ztest_dmu_prealloc(ztest_ds_t *zd, uint64_t id)
4027 {
4028         ztest_od_t od[1];
4029         uint64_t offset = (1ULL << (ztest_random(4) + SPA_MAXBLOCKSHIFT)) +
4030             (ztest_random(ZTEST_RANGE_LOCKS) << SPA_MAXBLOCKSHIFT);
4031         uint64_t count = ztest_random(20) + 1;
4032         uint64_t blocksize = ztest_random_blocksize();
4033         void *data;
4034 
4035         ztest_od_init(&od[0], id, FTAG, 0, DMU_OT_UINT64_OTHER, blocksize, 0);
4036 
4037         if (ztest_object_init(zd, od, sizeof (od), !ztest_random(2)) != 0)
4038                 return;
4039 
4040         if (ztest_truncate(zd, od[0].od_object, offset, count * blocksize) != 0)
4041                 return;
4042 
4043         ztest_prealloc(zd, od[0].od_object, offset, count * blocksize);
4044 
4045         data = umem_zalloc(blocksize, UMEM_NOFAIL);
4046 
4047         while (ztest_random(count) != 0) {
4048                 uint64_t randoff = offset + (ztest_random(count) * blocksize);
4049                 if (ztest_write(zd, od[0].od_object, randoff, blocksize,
4050                     data) != 0)
4051                         break;
4052                 while (ztest_random(4) != 0)
4053                         ztest_io(zd, od[0].od_object, randoff);
4054         }
4055 
4056         umem_free(data, blocksize);
4057 }
4058 
4059 /*
4060  * Verify that zap_{create,destroy,add,remove,update} work as expected.
4061  */
4062 #define ZTEST_ZAP_MIN_INTS      1
4063 #define ZTEST_ZAP_MAX_INTS      4
4064 #define ZTEST_ZAP_MAX_PROPS     1000
4065 
4066 void
4067 ztest_zap(ztest_ds_t *zd, uint64_t id)
4068 {
4069         objset_t *os = zd->zd_os;
4070         ztest_od_t od[1];
4071         uint64_t object;
4072         uint64_t txg, last_txg;
4073         uint64_t value[ZTEST_ZAP_MAX_INTS];
4074         uint64_t zl_ints, zl_intsize, prop;
4075         int i, ints;
4076         dmu_tx_t *tx;
4077         char propname[100], txgname[100];
4078         int error;
4079         char *hc[2] = { "s.acl.h", ".s.open.h.hyLZlg" };
4080 
4081         ztest_od_init(&od[0], id, FTAG, 0, DMU_OT_ZAP_OTHER, 0, 0);
4082 
4083         if (ztest_object_init(zd, od, sizeof (od), !ztest_random(2)) != 0)
4084                 return;
4085 
4086         object = od[0].od_object;
4087 
4088         /*
4089          * Generate a known hash collision, and verify that
4090          * we can lookup and remove both entries.
4091          */
4092         tx = dmu_tx_create(os);
4093         dmu_tx_hold_zap(tx, object, B_TRUE, NULL);
4094         txg = ztest_tx_assign(tx, TXG_MIGHTWAIT, FTAG);
4095         if (txg == 0)
4096                 return;
4097         for (i = 0; i < 2; i++) {
4098                 value[i] = i;
4099                 VERIFY3U(0, ==, zap_add(os, object, hc[i], sizeof (uint64_t),
4100                     1, &value[i], tx));
4101         }
4102         for (i = 0; i < 2; i++) {
4103                 VERIFY3U(EEXIST, ==, zap_add(os, object, hc[i],
4104                     sizeof (uint64_t), 1, &value[i], tx));
4105                 VERIFY3U(0, ==,
4106                     zap_length(os, object, hc[i], &zl_intsize, &zl_ints));
4107                 ASSERT3U(zl_intsize, ==, sizeof (uint64_t));
4108                 ASSERT3U(zl_ints, ==, 1);
4109         }
4110         for (i = 0; i < 2; i++) {
4111                 VERIFY3U(0, ==, zap_remove(os, object, hc[i], tx));
4112         }
4113         dmu_tx_commit(tx);
4114 
4115         /*
4116          * Generate a buch of random entries.
4117          */
4118         ints = MAX(ZTEST_ZAP_MIN_INTS, object % ZTEST_ZAP_MAX_INTS);
4119 
4120         prop = ztest_random(ZTEST_ZAP_MAX_PROPS);
4121         (void) sprintf(propname, "prop_%llu", (u_longlong_t)prop);
4122         (void) sprintf(txgname, "txg_%llu", (u_longlong_t)prop);
4123         bzero(value, sizeof (value));
4124         last_txg = 0;
4125 
4126         /*
4127          * If these zap entries already exist, validate their contents.
4128          */
4129         error = zap_length(os, object, txgname, &zl_intsize, &zl_ints);
4130         if (error == 0) {
4131                 ASSERT3U(zl_intsize, ==, sizeof (uint64_t));
4132                 ASSERT3U(zl_ints, ==, 1);
4133 
4134                 VERIFY(zap_lookup(os, object, txgname, zl_intsize,
4135                     zl_ints, &last_txg) == 0);
4136 
4137                 VERIFY(zap_length(os, object, propname, &zl_intsize,
4138                     &zl_ints) == 0);
4139 
4140                 ASSERT3U(zl_intsize, ==, sizeof (uint64_t));
4141                 ASSERT3U(zl_ints, ==, ints);
4142 
4143                 VERIFY(zap_lookup(os, object, propname, zl_intsize,
4144                     zl_ints, value) == 0);
4145 
4146                 for (i = 0; i < ints; i++) {
4147                         ASSERT3U(value[i], ==, last_txg + object + i);
4148                 }
4149         } else {
4150                 ASSERT3U(error, ==, ENOENT);
4151         }
4152 
4153         /*
4154          * Atomically update two entries in our zap object.
4155          * The first is named txg_%llu, and contains the txg
4156          * in which the property was last updated.  The second
4157          * is named prop_%llu, and the nth element of its value
4158          * should be txg + object + n.
4159          */
4160         tx = dmu_tx_create(os);
4161         dmu_tx_hold_zap(tx, object, B_TRUE, NULL);
4162         txg = ztest_tx_assign(tx, TXG_MIGHTWAIT, FTAG);
4163         if (txg == 0)
4164                 return;
4165 
4166         if (last_txg > txg)
4167                 fatal(0, "zap future leak: old %llu new %llu", last_txg, txg);
4168 
4169         for (i = 0; i < ints; i++)
4170                 value[i] = txg + object + i;
4171 
4172         VERIFY3U(0, ==, zap_update(os, object, txgname, sizeof (uint64_t),
4173             1, &txg, tx));
4174         VERIFY3U(0, ==, zap_update(os, object, propname, sizeof (uint64_t),
4175             ints, value, tx));
4176 
4177         dmu_tx_commit(tx);
4178 
4179         /*
4180          * Remove a random pair of entries.
4181          */
4182         prop = ztest_random(ZTEST_ZAP_MAX_PROPS);
4183         (void) sprintf(propname, "prop_%llu", (u_longlong_t)prop);
4184         (void) sprintf(txgname, "txg_%llu", (u_longlong_t)prop);
4185 
4186         error = zap_length(os, object, txgname, &zl_intsize, &zl_ints);
4187 
4188         if (error == ENOENT)
4189                 return;
4190 
4191         ASSERT0(error);
4192 
4193         tx = dmu_tx_create(os);
4194         dmu_tx_hold_zap(tx, object, B_TRUE, NULL);
4195         txg = ztest_tx_assign(tx, TXG_MIGHTWAIT, FTAG);
4196         if (txg == 0)
4197                 return;
4198         VERIFY3U(0, ==, zap_remove(os, object, txgname, tx));
4199         VERIFY3U(0, ==, zap_remove(os, object, propname, tx));
4200         dmu_tx_commit(tx);
4201 }
4202 
4203 /*
4204  * Testcase to test the upgrading of a microzap to fatzap.
4205  */
4206 void
4207 ztest_fzap(ztest_ds_t *zd, uint64_t id)
4208 {
4209         objset_t *os = zd->zd_os;
4210         ztest_od_t od[1];
4211         uint64_t object, txg;
4212 
4213         ztest_od_init(&od[0], id, FTAG, 0, DMU_OT_ZAP_OTHER, 0, 0);
4214 
4215         if (ztest_object_init(zd, od, sizeof (od), !ztest_random(2)) != 0)
4216                 return;
4217 
4218         object = od[0].od_object;
4219 
4220         /*
4221          * Add entries to this ZAP and make sure it spills over
4222          * and gets upgraded to a fatzap. Also, since we are adding
4223          * 2050 entries we should see ptrtbl growth and leaf-block split.
4224          */
4225         for (int i = 0; i < 2050; i++) {
4226                 char name[MAXNAMELEN];
4227                 uint64_t value = i;
4228                 dmu_tx_t *tx;
4229                 int error;
4230 
4231                 (void) snprintf(name, sizeof (name), "fzap-%llu-%llu",
4232                     id, value);
4233 
4234                 tx = dmu_tx_create(os);
4235                 dmu_tx_hold_zap(tx, object, B_TRUE, name);
4236                 txg = ztest_tx_assign(tx, TXG_MIGHTWAIT, FTAG);
4237                 if (txg == 0)
4238                         return;
4239                 error = zap_add(os, object, name, sizeof (uint64_t), 1,
4240                     &value, tx);
4241                 ASSERT(error == 0 || error == EEXIST);
4242                 dmu_tx_commit(tx);
4243         }
4244 }
4245 
4246 /* ARGSUSED */
4247 void
4248 ztest_zap_parallel(ztest_ds_t *zd, uint64_t id)
4249 {
4250         objset_t *os = zd->zd_os;
4251         ztest_od_t od[1];
4252         uint64_t txg, object, count, wsize, wc, zl_wsize, zl_wc;
4253         dmu_tx_t *tx;
4254         int i, namelen, error;
4255         int micro = ztest_random(2);
4256         char name[20], string_value[20];
4257         void *data;
4258 
4259         ztest_od_init(&od[0], ID_PARALLEL, FTAG, micro, DMU_OT_ZAP_OTHER, 0, 0);
4260 
4261         if (ztest_object_init(zd, od, sizeof (od), B_FALSE) != 0)
4262                 return;
4263 
4264         object = od[0].od_object;
4265 
4266         /*
4267          * Generate a random name of the form 'xxx.....' where each
4268          * x is a random printable character and the dots are dots.
4269          * There are 94 such characters, and the name length goes from
4270          * 6 to 20, so there are 94^3 * 15 = 12,458,760 possible names.
4271          */
4272         namelen = ztest_random(sizeof (name) - 5) + 5 + 1;
4273 
4274         for (i = 0; i < 3; i++)
4275                 name[i] = '!' + ztest_random('~' - '!' + 1);
4276         for (; i < namelen - 1; i++)
4277                 name[i] = '.';
4278         name[i] = '\0';
4279 
4280         if ((namelen & 1) || micro) {
4281                 wsize = sizeof (txg);
4282                 wc = 1;
4283                 data = &txg;
4284         } else {
4285                 wsize = 1;
4286                 wc = namelen;
4287                 data = string_value;
4288         }
4289 
4290         count = -1ULL;
4291         VERIFY0(zap_count(os, object, &count));
4292         ASSERT(count != -1ULL);
4293 
4294         /*
4295          * Select an operation: length, lookup, add, update, remove.
4296          */
4297         i = ztest_random(5);
4298 
4299         if (i >= 2) {
4300                 tx = dmu_tx_create(os);
4301                 dmu_tx_hold_zap(tx, object, B_TRUE, NULL);
4302                 txg = ztest_tx_assign(tx, TXG_MIGHTWAIT, FTAG);
4303                 if (txg == 0)
4304                         return;
4305                 bcopy(name, string_value, namelen);
4306         } else {
4307                 tx = NULL;
4308                 txg = 0;
4309                 bzero(string_value, namelen);
4310         }
4311 
4312         switch (i) {
4313 
4314         case 0:
4315                 error = zap_length(os, object, name, &zl_wsize, &zl_wc);
4316                 if (error == 0) {
4317                         ASSERT3U(wsize, ==, zl_wsize);
4318                         ASSERT3U(wc, ==, zl_wc);
4319                 } else {
4320                         ASSERT3U(error, ==, ENOENT);
4321                 }
4322                 break;
4323 
4324         case 1:
4325                 error = zap_lookup(os, object, name, wsize, wc, data);
4326                 if (error == 0) {
4327                         if (data == string_value &&
4328                             bcmp(name, data, namelen) != 0)
4329                                 fatal(0, "name '%s' != val '%s' len %d",
4330                                     name, data, namelen);
4331                 } else {
4332                         ASSERT3U(error, ==, ENOENT);
4333                 }
4334                 break;
4335 
4336         case 2:
4337                 error = zap_add(os, object, name, wsize, wc, data, tx);
4338                 ASSERT(error == 0 || error == EEXIST);
4339                 break;
4340 
4341         case 3:
4342                 VERIFY(zap_update(os, object, name, wsize, wc, data, tx) == 0);
4343                 break;
4344 
4345         case 4:
4346                 error = zap_remove(os, object, name, tx);
4347                 ASSERT(error == 0 || error == ENOENT);
4348                 break;
4349         }
4350 
4351         if (tx != NULL)
4352                 dmu_tx_commit(tx);
4353 }
4354 
4355 /*
4356  * Commit callback data.
4357  */
4358 typedef struct ztest_cb_data {
4359         list_node_t             zcd_node;
4360         uint64_t                zcd_txg;
4361         int                     zcd_expected_err;
4362         boolean_t               zcd_added;
4363         boolean_t               zcd_called;
4364         spa_t                   *zcd_spa;
4365 } ztest_cb_data_t;
4366 
4367 /* This is the actual commit callback function */
4368 static void
4369 ztest_commit_callback(void *arg, int error)
4370 {
4371         ztest_cb_data_t *data = arg;
4372         uint64_t synced_txg;
4373 
4374         VERIFY(data != NULL);
4375         VERIFY3S(data->zcd_expected_err, ==, error);
4376         VERIFY(!data->zcd_called);
4377 
4378         synced_txg = spa_last_synced_txg(data->zcd_spa);
4379         if (data->zcd_txg > synced_txg)
4380                 fatal(0, "commit callback of txg %" PRIu64 " called prematurely"
4381                     ", last synced txg = %" PRIu64 "\n", data->zcd_txg,
4382                     synced_txg);
4383 
4384         data->zcd_called = B_TRUE;
4385 
4386         if (error == ECANCELED) {
4387                 ASSERT0(data->zcd_txg);
4388                 ASSERT(!data->zcd_added);
4389 
4390                 /*
4391                  * The private callback data should be destroyed here, but
4392                  * since we are going to check the zcd_called field after
4393                  * dmu_tx_abort(), we will destroy it there.
4394                  */
4395                 return;
4396         }
4397 
4398         /* Was this callback added to the global callback list? */
4399         if (!data->zcd_added)
4400                 goto out;
4401 
4402         ASSERT3U(data->zcd_txg, !=, 0);
4403 
4404         /* Remove our callback from the list */
4405         (void) mutex_lock(&zcl.zcl_callbacks_lock);
4406         list_remove(&zcl.zcl_callbacks, data);
4407         (void) mutex_unlock(&zcl.zcl_callbacks_lock);
4408 
4409 out:
4410         umem_free(data, sizeof (ztest_cb_data_t));
4411 }
4412 
4413 /* Allocate and initialize callback data structure */
4414 static ztest_cb_data_t *
4415 ztest_create_cb_data(objset_t *os, uint64_t txg)
4416 {
4417         ztest_cb_data_t *cb_data;
4418 
4419         cb_data = umem_zalloc(sizeof (ztest_cb_data_t), UMEM_NOFAIL);
4420 
4421         cb_data->zcd_txg = txg;
4422         cb_data->zcd_spa = dmu_objset_spa(os);
4423 
4424         return (cb_data);
4425 }
4426 
4427 /*
4428  * If a number of txgs equal to this threshold have been created after a commit
4429  * callback has been registered but not called, then we assume there is an
4430  * implementation bug.
4431  */
4432 #define ZTEST_COMMIT_CALLBACK_THRESH    (TXG_CONCURRENT_STATES + 2)
4433 
4434 /*
4435  * Commit callback test.
4436  */
4437 void
4438 ztest_dmu_commit_callbacks(ztest_ds_t *zd, uint64_t id)
4439 {
4440         objset_t *os = zd->zd_os;
4441         ztest_od_t od[1];
4442         dmu_tx_t *tx;
4443         ztest_cb_data_t *cb_data[3], *tmp_cb;
4444         uint64_t old_txg, txg;
4445         int i, error;
4446 
4447         ztest_od_init(&od[0], id, FTAG, 0, DMU_OT_UINT64_OTHER, 0, 0);
4448 
4449         if (ztest_object_init(zd, od, sizeof (od), B_FALSE) != 0)
4450                 return;
4451 
4452         tx = dmu_tx_create(os);
4453 
4454         cb_data[0] = ztest_create_cb_data(os, 0);
4455         dmu_tx_callback_register(tx, ztest_commit_callback, cb_data[0]);
4456 
4457         dmu_tx_hold_write(tx, od[0].od_object, 0, sizeof (uint64_t));
4458 
4459         /* Every once in a while, abort the transaction on purpose */
4460         if (ztest_random(100) == 0)
4461                 error = -1;
4462 
4463         if (!error)
4464                 error = dmu_tx_assign(tx, TXG_NOWAIT);
4465 
4466         txg = error ? 0 : dmu_tx_get_txg(tx);
4467 
4468         cb_data[0]->zcd_txg = txg;
4469         cb_data[1] = ztest_create_cb_data(os, txg);
4470         dmu_tx_callback_register(tx, ztest_commit_callback, cb_data[1]);
4471 
4472         if (error) {
4473                 /*
4474                  * It's not a strict requirement to call the registered
4475                  * callbacks from inside dmu_tx_abort(), but that's what
4476                  * it's supposed to happen in the current implementation
4477                  * so we will check for that.
4478                  */
4479                 for (i = 0; i < 2; i++) {
4480                         cb_data[i]->zcd_expected_err = ECANCELED;
4481                         VERIFY(!cb_data[i]->zcd_called);
4482                 }
4483 
4484                 dmu_tx_abort(tx);
4485 
4486                 for (i = 0; i < 2; i++) {
4487                         VERIFY(cb_data[i]->zcd_called);
4488                         umem_free(cb_data[i], sizeof (ztest_cb_data_t));
4489                 }
4490 
4491                 return;
4492         }
4493 
4494         cb_data[2] = ztest_create_cb_data(os, txg);
4495         dmu_tx_callback_register(tx, ztest_commit_callback, cb_data[2]);
4496 
4497         /*
4498          * Read existing data to make sure there isn't a future leak.
4499          */
4500         VERIFY(0 == dmu_read(os, od[0].od_object, 0, sizeof (uint64_t),
4501             &old_txg, DMU_READ_PREFETCH));
4502 
4503         if (old_txg > txg)
4504                 fatal(0, "future leak: got %" PRIu64 ", open txg is %" PRIu64,
4505                     old_txg, txg);
4506 
4507         dmu_write(os, od[0].od_object, 0, sizeof (uint64_t), &txg, tx);
4508 
4509         (void) mutex_lock(&zcl.zcl_callbacks_lock);
4510 
4511         /*
4512          * Since commit callbacks don't have any ordering requirement and since
4513          * it is theoretically possible for a commit callback to be called
4514          * after an arbitrary amount of time has elapsed since its txg has been
4515          * synced, it is difficult to reliably determine whether a commit
4516          * callback hasn't been called due to high load or due to a flawed
4517          * implementation.
4518          *
4519          * In practice, we will assume that if after a certain number of txgs a
4520          * commit callback hasn't been called, then most likely there's an
4521          * implementation bug..
4522          */
4523         tmp_cb = list_head(&zcl.zcl_callbacks);
4524         if (tmp_cb != NULL &&
4525             (txg - ZTEST_COMMIT_CALLBACK_THRESH) > tmp_cb->zcd_txg) {
4526                 fatal(0, "Commit callback threshold exceeded, oldest txg: %"
4527                     PRIu64 ", open txg: %" PRIu64 "\n", tmp_cb->zcd_txg, txg);
4528         }
4529 
4530         /*
4531          * Let's find the place to insert our callbacks.
4532          *
4533          * Even though the list is ordered by txg, it is possible for the
4534          * insertion point to not be the end because our txg may already be
4535          * quiescing at this point and other callbacks in the open txg
4536          * (from other objsets) may have sneaked in.
4537          */
4538         tmp_cb = list_tail(&zcl.zcl_callbacks);
4539         while (tmp_cb != NULL && tmp_cb->zcd_txg > txg)
4540                 tmp_cb = list_prev(&zcl.zcl_callbacks, tmp_cb);
4541 
4542         /* Add the 3 callbacks to the list */
4543         for (i = 0; i < 3; i++) {
4544                 if (tmp_cb == NULL)
4545                         list_insert_head(&zcl.zcl_callbacks, cb_data[i]);
4546                 else
4547                         list_insert_after(&zcl.zcl_callbacks, tmp_cb,
4548                             cb_data[i]);
4549 
4550                 cb_data[i]->zcd_added = B_TRUE;
4551                 VERIFY(!cb_data[i]->zcd_called);
4552 
4553                 tmp_cb = cb_data[i];
4554         }
4555 
4556         (void) mutex_unlock(&zcl.zcl_callbacks_lock);
4557 
4558         dmu_tx_commit(tx);
4559 }
4560 
4561 /* ARGSUSED */
4562 void
4563 ztest_dsl_prop_get_set(ztest_ds_t *zd, uint64_t id)
4564 {
4565         zfs_prop_t proplist[] = {
4566                 ZFS_PROP_CHECKSUM,
4567                 ZFS_PROP_COMPRESSION,
4568                 ZFS_PROP_COPIES,
4569                 ZFS_PROP_DEDUP
4570         };
4571 
4572         (void) rw_rdlock(&ztest_name_lock);
4573 
4574         for (int p = 0; p < sizeof (proplist) / sizeof (proplist[0]); p++)
4575                 (void) ztest_dsl_prop_set_uint64(zd->zd_name, proplist[p],
4576                     ztest_random_dsl_prop(proplist[p]), (int)ztest_random(2));
4577 
4578         (void) rw_unlock(&ztest_name_lock);
4579 }
4580 
4581 /* ARGSUSED */
4582 void
4583 ztest_spa_prop_get_set(ztest_ds_t *zd, uint64_t id)
4584 {
4585         nvlist_t *props = NULL;
4586 
4587         (void) rw_rdlock(&ztest_name_lock);
4588 
4589         (void) ztest_spa_prop_set_uint64(ZPOOL_PROP_DEDUPDITTO,
4590             ZIO_DEDUPDITTO_MIN + ztest_random(ZIO_DEDUPDITTO_MIN));
4591 
4592         VERIFY0(spa_prop_get(ztest_spa, &props));
4593 
4594         if (ztest_opts.zo_verbose >= 6)
4595                 dump_nvlist(props, 4);
4596 
4597         nvlist_free(props);
4598 
4599         (void) rw_unlock(&ztest_name_lock);
4600 }
4601 
4602 static int
4603 user_release_one(const char *snapname, const char *holdname)
4604 {
4605         nvlist_t *snaps, *holds;
4606         int error;
4607 
4608         snaps = fnvlist_alloc();
4609         holds = fnvlist_alloc();
4610         fnvlist_add_boolean(holds, holdname);
4611         fnvlist_add_nvlist(snaps, snapname, holds);
4612         fnvlist_free(holds);
4613         error = dsl_dataset_user_release(snaps, NULL);
4614         fnvlist_free(snaps);
4615         return (error);
4616 }
4617 
4618 /*
4619  * Test snapshot hold/release and deferred destroy.
4620  */
4621 void
4622 ztest_dmu_snapshot_hold(ztest_ds_t *zd, uint64_t id)
4623 {
4624         int error;
4625         objset_t *os = zd->zd_os;
4626         objset_t *origin;
4627         char snapname[100];
4628         char fullname[100];
4629         char clonename[100];
4630         char tag[100];
4631         char osname[MAXNAMELEN];
4632         nvlist_t *holds;
4633 
4634         (void) rw_rdlock(&ztest_name_lock);
4635 
4636         dmu_objset_name(os, osname);
4637 
4638         (void) snprintf(snapname, sizeof (snapname), "sh1_%llu", id);
4639         (void) snprintf(fullname, sizeof (fullname), "%s@%s", osname, snapname);
4640         (void) snprintf(clonename, sizeof (clonename),
4641             "%s/ch1_%llu", osname, id);
4642         (void) snprintf(tag, sizeof (tag), "tag_%llu", id);
4643 
4644         /*
4645          * Clean up from any previous run.
4646          */
4647         error = dsl_destroy_head(clonename);
4648         if (error != ENOENT)
4649                 ASSERT0(error);
4650         error = user_release_one(fullname, tag);
4651         if (error != ESRCH && error != ENOENT)
4652                 ASSERT0(error);
4653         error = dsl_destroy_snapshot(fullname, B_FALSE);
4654         if (error != ENOENT)
4655                 ASSERT0(error);
4656 
4657         /*
4658          * Create snapshot, clone it, mark snap for deferred destroy,
4659          * destroy clone, verify snap was also destroyed.
4660          */
4661         error = dmu_objset_snapshot_one(osname, snapname);
4662         if (error) {
4663                 if (error == ENOSPC) {
4664                         ztest_record_enospc("dmu_objset_snapshot");
4665                         goto out;
4666                 }
4667                 fatal(0, "dmu_objset_snapshot(%s) = %d", fullname, error);
4668         }
4669 
4670         error = dmu_objset_clone(clonename, fullname);
4671         if (error) {
4672                 if (error == ENOSPC) {
4673                         ztest_record_enospc("dmu_objset_clone");
4674                         goto out;
4675                 }
4676                 fatal(0, "dmu_objset_clone(%s) = %d", clonename, error);
4677         }
4678 
4679         error = dsl_destroy_snapshot(fullname, B_TRUE);
4680         if (error) {
4681                 fatal(0, "dsl_destroy_snapshot(%s, B_TRUE) = %d",
4682                     fullname, error);
4683         }
4684 
4685         error = dsl_destroy_head(clonename);
4686         if (error)
4687                 fatal(0, "dsl_destroy_head(%s) = %d", clonename, error);
4688 
4689         error = dmu_objset_hold(fullname, FTAG, &origin);
4690         if (error != ENOENT)
4691                 fatal(0, "dmu_objset_hold(%s) = %d", fullname, error);
4692 
4693         /*
4694          * Create snapshot, add temporary hold, verify that we can't
4695          * destroy a held snapshot, mark for deferred destroy,
4696          * release hold, verify snapshot was destroyed.
4697          */
4698         error = dmu_objset_snapshot_one(osname, snapname);
4699         if (error) {
4700                 if (error == ENOSPC) {
4701                         ztest_record_enospc("dmu_objset_snapshot");
4702                         goto out;
4703                 }
4704                 fatal(0, "dmu_objset_snapshot(%s) = %d", fullname, error);
4705         }
4706 
4707         holds = fnvlist_alloc();
4708         fnvlist_add_string(holds, fullname, tag);
4709         error = dsl_dataset_user_hold(holds, 0, NULL);
4710         fnvlist_free(holds);
4711 
4712         if (error)
4713                 fatal(0, "dsl_dataset_user_hold(%s)", fullname, tag);
4714 
4715         error = dsl_destroy_snapshot(fullname, B_FALSE);
4716         if (error != EBUSY) {
4717                 fatal(0, "dsl_destroy_snapshot(%s, B_FALSE) = %d",
4718                     fullname, error);
4719         }
4720 
4721         error = dsl_destroy_snapshot(fullname, B_TRUE);
4722         if (error) {
4723                 fatal(0, "dsl_destroy_snapshot(%s, B_TRUE) = %d",
4724                     fullname, error);
4725         }
4726 
4727         error = user_release_one(fullname, tag);
4728         if (error)
4729                 fatal(0, "user_release_one(%s, %s) = %d", fullname, tag, error);
4730 
4731         VERIFY3U(dmu_objset_hold(fullname, FTAG, &origin), ==, ENOENT);
4732 
4733 out:
4734         (void) rw_unlock(&ztest_name_lock);
4735 }
4736 
4737 /*
4738  * Inject random faults into the on-disk data.
4739  */
4740 /* ARGSUSED */
4741 void
4742 ztest_fault_inject(ztest_ds_t *zd, uint64_t id)
4743 {
4744         ztest_shared_t *zs = ztest_shared;
4745         spa_t *spa = ztest_spa;
4746         int fd;
4747         uint64_t offset;
4748         uint64_t leaves;
4749         uint64_t bad = 0x1990c0ffeedecade;
4750         uint64_t top, leaf;
4751         char path0[MAXPATHLEN];
4752         char pathrand[MAXPATHLEN];
4753         size_t fsize;
4754         int bshift = SPA_MAXBLOCKSHIFT + 2;     /* don't scrog all labels */
4755         int iters = 1000;
4756         int maxfaults;
4757         int mirror_save;
4758         vdev_t *vd0 = NULL;
4759         uint64_t guid0 = 0;
4760         boolean_t islog = B_FALSE;
4761 
4762         VERIFY(mutex_lock(&ztest_vdev_lock) == 0);
4763         maxfaults = MAXFAULTS();
4764         leaves = MAX(zs->zs_mirrors, 1) * ztest_opts.zo_raidz;
4765         mirror_save = zs->zs_mirrors;
4766         VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
4767 
4768         ASSERT(leaves >= 1);
4769 
4770         /*
4771          * Grab the name lock as reader. There are some operations
4772          * which don't like to have their vdevs changed while
4773          * they are in progress (i.e. spa_change_guid). Those
4774          * operations will have grabbed the name lock as writer.
4775          */
4776         (void) rw_rdlock(&ztest_name_lock);
4777 
4778         /*
4779          * We need SCL_STATE here because we're going to look at vd0->vdev_tsd.
4780          */
4781         spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
4782 
4783         if (ztest_random(2) == 0) {
4784                 /*
4785                  * Inject errors on a normal data device or slog device.
4786                  */
4787                 top = ztest_random_vdev_top(spa, B_TRUE);
4788                 leaf = ztest_random(leaves) + zs->zs_splits;
4789 
4790                 /*
4791                  * Generate paths to the first leaf in this top-level vdev,
4792                  * and to the random leaf we selected.  We'll induce transient
4793                  * write failures and random online/offline activity on leaf 0,
4794                  * and we'll write random garbage to the randomly chosen leaf.
4795                  */
4796                 (void) snprintf(path0, sizeof (path0), ztest_dev_template,
4797                     ztest_opts.zo_dir, ztest_opts.zo_pool,
4798                     top * leaves + zs->zs_splits);
4799                 (void) snprintf(pathrand, sizeof (pathrand), ztest_dev_template,
4800                     ztest_opts.zo_dir, ztest_opts.zo_pool,
4801                     top * leaves + leaf);
4802 
4803                 vd0 = vdev_lookup_by_path(spa->spa_root_vdev, path0);
4804                 if (vd0 != NULL && vd0->vdev_top->vdev_islog)
4805                         islog = B_TRUE;
4806 
4807                 /*
4808                  * If the top-level vdev needs to be resilvered
4809                  * then we only allow faults on the device that is
4810                  * resilvering.
4811                  */
4812                 if (vd0 != NULL && maxfaults != 1 &&
4813                     (!vdev_resilver_needed(vd0->vdev_top, NULL, NULL) ||
4814                     vd0->vdev_resilver_txg != 0)) {
4815                         /*
4816                          * Make vd0 explicitly claim to be unreadable,
4817                          * or unwriteable, or reach behind its back
4818                          * and close the underlying fd.  We can do this if
4819                          * maxfaults == 0 because we'll fail and reexecute,
4820                          * and we can do it if maxfaults >= 2 because we'll
4821                          * have enough redundancy.  If maxfaults == 1, the
4822                          * combination of this with injection of random data
4823                          * corruption below exceeds the pool's fault tolerance.
4824                          */
4825                         vdev_file_t *vf = vd0->vdev_tsd;
4826 
4827                         if (vf != NULL && ztest_random(3) == 0) {
4828                                 (void) close(vf->vf_vnode->v_fd);
4829                                 vf->vf_vnode->v_fd = -1;
4830                         } else if (ztest_random(2) == 0) {
4831                                 vd0->vdev_cant_read = B_TRUE;
4832                         } else {
4833                                 vd0->vdev_cant_write = B_TRUE;
4834                         }
4835                         guid0 = vd0->vdev_guid;
4836                 }
4837         } else {
4838                 /*
4839                  * Inject errors on an l2cache device.
4840                  */
4841                 spa_aux_vdev_t *sav = &spa->spa_l2cache;
4842 
4843                 if (sav->sav_count == 0) {
4844                         spa_config_exit(spa, SCL_STATE, FTAG);
4845                         (void) rw_unlock(&ztest_name_lock);
4846                         return;
4847                 }
4848                 vd0 = sav->sav_vdevs[ztest_random(sav->sav_count)];
4849                 guid0 = vd0->vdev_guid;
4850                 (void) strcpy(path0, vd0->vdev_path);
4851                 (void) strcpy(pathrand, vd0->vdev_path);
4852 
4853                 leaf = 0;
4854                 leaves = 1;
4855                 maxfaults = INT_MAX;    /* no limit on cache devices */
4856         }
4857 
4858         spa_config_exit(spa, SCL_STATE, FTAG);
4859         (void) rw_unlock(&ztest_name_lock);
4860 
4861         /*
4862          * If we can tolerate two or more faults, or we're dealing
4863          * with a slog, randomly online/offline vd0.
4864          */
4865         if ((maxfaults >= 2 || islog) && guid0 != 0) {
4866                 if (ztest_random(10) < 6) {
4867                         int flags = (ztest_random(2) == 0 ?
4868                             ZFS_OFFLINE_TEMPORARY : 0);
4869 
4870                         /*
4871                          * We have to grab the zs_name_lock as writer to
4872                          * prevent a race between offlining a slog and
4873                          * destroying a dataset. Offlining the slog will
4874                          * grab a reference on the dataset which may cause
4875                          * dmu_objset_destroy() to fail with EBUSY thus
4876                          * leaving the dataset in an inconsistent state.
4877                          */
4878                         if (islog)
4879                                 (void) rw_wrlock(&ztest_name_lock);
4880 
4881                         VERIFY(vdev_offline(spa, guid0, flags) != EBUSY);
4882 
4883                         if (islog)
4884                                 (void) rw_unlock(&ztest_name_lock);
4885                 } else {
4886                         /*
4887                          * Ideally we would like to be able to randomly
4888                          * call vdev_[on|off]line without holding locks
4889                          * to force unpredictable failures but the side
4890                          * effects of vdev_[on|off]line prevent us from
4891                          * doing so. We grab the ztest_vdev_lock here to
4892                          * prevent a race between injection testing and
4893                          * aux_vdev removal.
4894                          */
4895                         VERIFY(mutex_lock(&ztest_vdev_lock) == 0);
4896                         (void) vdev_online(spa, guid0, 0, NULL);
4897                         VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
4898                 }
4899         }
4900 
4901         if (maxfaults == 0)
4902                 return;
4903 
4904         /*
4905          * We have at least single-fault tolerance, so inject data corruption.
4906          */
4907         fd = open(pathrand, O_RDWR);
4908 
4909         if (fd == -1)   /* we hit a gap in the device namespace */
4910                 return;
4911 
4912         fsize = lseek(fd, 0, SEEK_END);
4913 
4914         while (--iters != 0) {
4915                 offset = ztest_random(fsize / (leaves << bshift)) *
4916                     (leaves << bshift) + (leaf << bshift) +
4917                     (ztest_random(1ULL << (bshift - 1)) & -8ULL);
4918 
4919                 if (offset >= fsize)
4920                         continue;
4921 
4922                 VERIFY(mutex_lock(&ztest_vdev_lock) == 0);
4923                 if (mirror_save != zs->zs_mirrors) {
4924                         VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
4925                         (void) close(fd);
4926                         return;
4927                 }
4928 
4929                 if (pwrite(fd, &bad, sizeof (bad), offset) != sizeof (bad))
4930                         fatal(1, "can't inject bad word at 0x%llx in %s",
4931                             offset, pathrand);
4932 
4933                 VERIFY(mutex_unlock(&ztest_vdev_lock) == 0);
4934 
4935                 if (ztest_opts.zo_verbose >= 7)
4936                         (void) printf("injected bad word into %s,"
4937                             " offset 0x%llx\n", pathrand, (u_longlong_t)offset);
4938         }
4939 
4940         (void) close(fd);
4941 }
4942 
4943 /*
4944  * Verify that DDT repair works as expected.
4945  */
4946 void
4947 ztest_ddt_repair(ztest_ds_t *zd, uint64_t id)
4948 {
4949         ztest_shared_t *zs = ztest_shared;
4950         spa_t *spa = ztest_spa;
4951         objset_t *os = zd->zd_os;
4952         ztest_od_t od[1];
4953         uint64_t object, blocksize, txg, pattern, psize;
4954         enum zio_checksum checksum = spa_dedup_checksum(spa);
4955         dmu_buf_t *db;
4956         dmu_tx_t *tx;
4957         void *buf;
4958         blkptr_t blk;
4959         int copies = 2 * ZIO_DEDUPDITTO_MIN;
4960 
4961         blocksize = ztest_random_blocksize();
4962         blocksize = MIN(blocksize, 2048);       /* because we write so many */
4963 
4964         ztest_od_init(&od[0], id, FTAG, 0, DMU_OT_UINT64_OTHER, blocksize, 0);
4965 
4966         if (ztest_object_init(zd, od, sizeof (od), B_FALSE) != 0)
4967                 return;
4968 
4969         /*
4970          * Take the name lock as writer to prevent anyone else from changing
4971          * the pool and dataset properies we need to maintain during this test.
4972          */
4973         (void) rw_wrlock(&ztest_name_lock);
4974 
4975         if (ztest_dsl_prop_set_uint64(zd->zd_name, ZFS_PROP_DEDUP, checksum,
4976             B_FALSE) != 0 ||
4977             ztest_dsl_prop_set_uint64(zd->zd_name, ZFS_PROP_COPIES, 1,
4978             B_FALSE) != 0) {
4979                 (void) rw_unlock(&ztest_name_lock);
4980                 return;
4981         }
4982 
4983         object = od[0].od_object;
4984         blocksize = od[0].od_blocksize;
4985         pattern = zs->zs_guid ^ dmu_objset_fsid_guid(os);
4986 
4987         ASSERT(object != 0);
4988 
4989         tx = dmu_tx_create(os);
4990         dmu_tx_hold_write(tx, object, 0, copies * blocksize);
4991         txg = ztest_tx_assign(tx, TXG_WAIT, FTAG);
4992         if (txg == 0) {
4993                 (void) rw_unlock(&ztest_name_lock);
4994                 return;
4995         }
4996 
4997         /*
4998          * Write all the copies of our block.
4999          */
5000         for (int i = 0; i < copies; i++) {
5001                 uint64_t offset = i * blocksize;
5002                 int error = dmu_buf_hold(os, object, offset, FTAG, &db,
5003                     DMU_READ_NO_PREFETCH);
5004                 if (error != 0) {
5005                         fatal(B_FALSE, "dmu_buf_hold(%p, %llu, %llu) = %u",
5006                             os, (long long)object, (long long) offset, error);
5007                 }
5008                 ASSERT(db->db_offset == offset);
5009                 ASSERT(db->db_size == blocksize);
5010                 ASSERT(ztest_pattern_match(db->db_data, db->db_size, pattern) ||
5011                     ztest_pattern_match(db->db_data, db->db_size, 0ULL));
5012                 dmu_buf_will_fill(db, tx);
5013                 ztest_pattern_set(db->db_data, db->db_size, pattern);
5014                 dmu_buf_rele(db, FTAG);
5015         }
5016 
5017         dmu_tx_commit(tx);
5018         txg_wait_synced(spa_get_dsl(spa), txg);
5019 
5020         /*
5021          * Find out what block we got.
5022          */
5023         VERIFY0(dmu_buf_hold(os, object, 0, FTAG, &db,
5024             DMU_READ_NO_PREFETCH));
5025         blk = *((dmu_buf_impl_t *)db)->db_blkptr;
5026         dmu_buf_rele(db, FTAG);
5027 
5028         /*
5029          * Damage the block.  Dedup-ditto will save us when we read it later.
5030          */
5031         psize = BP_GET_PSIZE(&blk);
5032         buf = zio_buf_alloc(psize);
5033         ztest_pattern_set(buf, psize, ~pattern);
5034 
5035         (void) zio_wait(zio_rewrite(NULL, spa, 0, &blk,
5036             buf, psize, NULL, NULL, ZIO_PRIORITY_SYNC_WRITE,
5037             ZIO_FLAG_CANFAIL | ZIO_FLAG_INDUCE_DAMAGE, NULL));
5038 
5039         zio_buf_free(buf, psize);
5040 
5041         (void) rw_unlock(&ztest_name_lock);
5042 }
5043 
5044 /*
5045  * Scrub the pool.
5046  */
5047 /* ARGSUSED */
5048 void
5049 ztest_scrub(ztest_ds_t *zd, uint64_t id)
5050 {
5051         spa_t *spa = ztest_spa;
5052 
5053         (void) spa_scan(spa, POOL_SCAN_SCRUB);
5054         (void) poll(NULL, 0, 100); /* wait a moment, then force a restart */
5055         (void) spa_scan(spa, POOL_SCAN_SCRUB);
5056 }
5057 
5058 /*
5059  * Change the guid for the pool.
5060  */
5061 /* ARGSUSED */
5062 void
5063 ztest_reguid(ztest_ds_t *zd, uint64_t id)
5064 {
5065         spa_t *spa = ztest_spa;
5066         uint64_t orig, load;
5067         int error;
5068 
5069         orig = spa_guid(spa);
5070         load = spa_load_guid(spa);
5071 
5072         (void) rw_wrlock(&ztest_name_lock);
5073         error = spa_change_guid(spa);
5074         (void) rw_unlock(&ztest_name_lock);
5075 
5076         if (error != 0)
5077                 return;
5078 
5079         if (ztest_opts.zo_verbose >= 4) {
5080                 (void) printf("Changed guid old %llu -> %llu\n",
5081                     (u_longlong_t)orig, (u_longlong_t)spa_guid(spa));
5082         }
5083 
5084         VERIFY3U(orig, !=, spa_guid(spa));
5085         VERIFY3U(load, ==, spa_load_guid(spa));
5086 }
5087 
5088 /*
5089  * Rename the pool to a different name and then rename it back.
5090  */
5091 /* ARGSUSED */
5092 void
5093 ztest_spa_rename(ztest_ds_t *zd, uint64_t id)
5094 {
5095         char *oldname, *newname;
5096         spa_t *spa;
5097 
5098         (void) rw_wrlock(&ztest_name_lock);
5099 
5100         oldname = ztest_opts.zo_pool;
5101         newname = umem_alloc(strlen(oldname) + 5, UMEM_NOFAIL);
5102         (void) strcpy(newname, oldname);
5103         (void) strcat(newname, "_tmp");
5104 
5105         /*
5106          * Do the rename
5107          */
5108         VERIFY3U(0, ==, spa_rename(oldname, newname));
5109 
5110         /*
5111          * Try to open it under the old name, which shouldn't exist
5112          */
5113         VERIFY3U(ENOENT, ==, spa_open(oldname, &spa, FTAG));
5114 
5115         /*
5116          * Open it under the new name and make sure it's still the same spa_t.
5117          */
5118         VERIFY3U(0, ==, spa_open(newname, &spa, FTAG));
5119 
5120         ASSERT(spa == ztest_spa);
5121         spa_close(spa, FTAG);
5122 
5123         /*
5124          * Rename it back to the original
5125          */
5126         VERIFY3U(0, ==, spa_rename(newname, oldname));
5127 
5128         /*
5129          * Make sure it can still be opened
5130          */
5131         VERIFY3U(0, ==, spa_open(oldname, &spa, FTAG));
5132 
5133         ASSERT(spa == ztest_spa);
5134         spa_close(spa, FTAG);
5135 
5136         umem_free(newname, strlen(newname) + 1);
5137 
5138         (void) rw_unlock(&ztest_name_lock);
5139 }
5140 
5141 /*
5142  * Verify pool integrity by running zdb.
5143  */
5144 static void
5145 ztest_run_zdb(char *pool)
5146 {
5147         int status;
5148         char zdb[MAXPATHLEN + MAXNAMELEN + 20];
5149         char zbuf[1024];
5150         char *bin;
5151         char *ztest;
5152         char *isa;
5153         int isalen;
5154         FILE *fp;
5155 
5156         (void) realpath(getexecname(), zdb);
5157 
5158         /* zdb lives in /usr/sbin, while ztest lives in /usr/bin */
5159         bin = strstr(zdb, "/usr/bin/");
5160         ztest = strstr(bin, "/ztest");
5161         isa = bin + 8;
5162         isalen = ztest - isa;
5163         isa = strdup(isa);
5164         /* LINTED */
5165         (void) sprintf(bin,
5166             "/usr/sbin%.*s/zdb -bcc%s%s -U %s %s",
5167             isalen,
5168             isa,
5169             ztest_opts.zo_verbose >= 3 ? "s" : "",
5170             ztest_opts.zo_verbose >= 4 ? "v" : "",
5171             spa_config_path,
5172             pool);
5173         free(isa);
5174 
5175         if (ztest_opts.zo_verbose >= 5)
5176                 (void) printf("Executing %s\n", strstr(zdb, "zdb "));
5177 
5178         fp = popen(zdb, "r");
5179 
5180         while (fgets(zbuf, sizeof (zbuf), fp) != NULL)
5181                 if (ztest_opts.zo_verbose >= 3)
5182                         (void) printf("%s", zbuf);
5183 
5184         status = pclose(fp);
5185 
5186         if (status == 0)
5187                 return;
5188 
5189         ztest_dump_core = 0;
5190         if (WIFEXITED(status))
5191                 fatal(0, "'%s' exit code %d", zdb, WEXITSTATUS(status));
5192         else
5193                 fatal(0, "'%s' died with signal %d", zdb, WTERMSIG(status));
5194 }
5195 
5196 static void
5197 ztest_walk_pool_directory(char *header)
5198 {
5199         spa_t *spa = NULL;
5200 
5201         if (ztest_opts.zo_verbose >= 6)
5202                 (void) printf("%s\n", header);
5203 
5204         mutex_enter(&spa_namespace_lock);
5205         while ((spa = spa_next(spa)) != NULL)
5206                 if (ztest_opts.zo_verbose >= 6)
5207                         (void) printf("\t%s\n", spa_name(spa));
5208         mutex_exit(&spa_namespace_lock);
5209 }
5210 
5211 static void
5212 ztest_spa_import_export(char *oldname, char *newname)
5213 {
5214         nvlist_t *config, *newconfig;
5215         uint64_t pool_guid;
5216         spa_t *spa;
5217         int error;
5218 
5219         if (ztest_opts.zo_verbose >= 4) {
5220                 (void) printf("import/export: old = %s, new = %s\n",
5221                     oldname, newname);
5222         }
5223 
5224         /*
5225          * Clean up from previous runs.
5226          */
5227         (void) spa_destroy(newname);
5228 
5229         /*
5230          * Get the pool's configuration and guid.
5231          */
5232         VERIFY3U(0, ==, spa_open(oldname, &spa, FTAG));
5233 
5234         /*
5235          * Kick off a scrub to tickle scrub/export races.
5236          */
5237         if (ztest_random(2) == 0)
5238                 (void) spa_scan(spa, POOL_SCAN_SCRUB);
5239 
5240         pool_guid = spa_guid(spa);
5241         spa_close(spa, FTAG);
5242 
5243         ztest_walk_pool_directory("pools before export");
5244 
5245         /*
5246          * Export it.
5247          */
5248         VERIFY3U(0, ==, spa_export(oldname, &config, B_FALSE, B_FALSE));
5249 
5250         ztest_walk_pool_directory("pools after export");
5251 
5252         /*
5253          * Try to import it.
5254          */
5255         newconfig = spa_tryimport(config);
5256         ASSERT(newconfig != NULL);
5257         nvlist_free(newconfig);
5258 
5259         /*
5260          * Import it under the new name.
5261          */
5262         error = spa_import(newname, config, NULL, 0);
5263         if (error != 0) {
5264                 dump_nvlist(config, 0);
5265                 fatal(B_FALSE, "couldn't import pool %s as %s: error %u",
5266                     oldname, newname, error);
5267         }
5268 
5269         ztest_walk_pool_directory("pools after import");
5270 
5271         /*
5272          * Try to import it again -- should fail with EEXIST.
5273          */
5274         VERIFY3U(EEXIST, ==, spa_import(newname, config, NULL, 0));
5275 
5276         /*
5277          * Try to import it under a different name -- should fail with EEXIST.
5278          */
5279         VERIFY3U(EEXIST, ==, spa_import(oldname, config, NULL, 0));
5280 
5281         /*
5282          * Verify that the pool is no longer visible under the old name.
5283          */
5284         VERIFY3U(ENOENT, ==, spa_open(oldname, &spa, FTAG));
5285 
5286         /*
5287          * Verify that we can open and close the pool using the new name.
5288          */
5289         VERIFY3U(0, ==, spa_open(newname, &spa, FTAG));
5290         ASSERT(pool_guid == spa_guid(spa));
5291         spa_close(spa, FTAG);
5292 
5293         nvlist_free(config);
5294 }
5295 
5296 static void
5297 ztest_resume(spa_t *spa)
5298 {
5299         if (spa_suspended(spa) && ztest_opts.zo_verbose >= 6)
5300                 (void) printf("resuming from suspended state\n");
5301         spa_vdev_state_enter(spa, SCL_NONE);
5302         vdev_clear(spa, NULL);
5303         (void) spa_vdev_state_exit(spa, NULL, 0);
5304         (void) zio_resume(spa);
5305 }
5306 
5307 static void *
5308 ztest_resume_thread(void *arg)
5309 {
5310         spa_t *spa = arg;
5311 
5312         while (!ztest_exiting) {
5313                 if (spa_suspended(spa))
5314                         ztest_resume(spa);
5315                 (void) poll(NULL, 0, 100);
5316         }
5317         return (NULL);
5318 }
5319 
5320 static void *
5321 ztest_deadman_thread(void *arg)
5322 {
5323         ztest_shared_t *zs = arg;
5324         spa_t *spa = ztest_spa;
5325         hrtime_t delta, total = 0;
5326 
5327         for (;;) {
5328                 delta = (zs->zs_thread_stop - zs->zs_thread_start) /
5329                     NANOSEC + zfs_deadman_synctime;
5330 
5331                 (void) poll(NULL, 0, (int)(1000 * delta));
5332 
5333                 /*
5334                  * If the pool is suspended then fail immediately. Otherwise,
5335                  * check to see if the pool is making any progress. If
5336                  * vdev_deadman() discovers that there hasn't been any recent
5337                  * I/Os then it will end up aborting the tests.
5338                  */
5339                 if (spa_suspended(spa)) {
5340                         fatal(0, "aborting test after %llu seconds because "
5341                             "pool has transitioned to a suspended state.",
5342                             zfs_deadman_synctime);
5343                         return (NULL);
5344                 }
5345                 vdev_deadman(spa->spa_root_vdev);
5346 
5347                 total += zfs_deadman_synctime;
5348                 (void) printf("ztest has been running for %lld seconds\n",
5349                     total);
5350         }
5351 }
5352 
5353 static void
5354 ztest_execute(int test, ztest_info_t *zi, uint64_t id)
5355 {
5356         ztest_ds_t *zd = &ztest_ds[id % ztest_opts.zo_datasets];
5357         ztest_shared_callstate_t *zc = ZTEST_GET_SHARED_CALLSTATE(test);
5358         hrtime_t functime = gethrtime();
5359 
5360         for (int i = 0; i < zi->zi_iters; i++)
5361                 zi->zi_func(zd, id);
5362 
5363         functime = gethrtime() - functime;
5364 
5365         atomic_add_64(&zc->zc_count, 1);
5366         atomic_add_64(&zc->zc_time, functime);
5367 
5368         if (ztest_opts.zo_verbose >= 4) {
5369                 Dl_info dli;
5370                 (void) dladdr((void *)zi->zi_func, &dli);
5371                 (void) printf("%6.2f sec in %s\n",
5372                     (double)functime / NANOSEC, dli.dli_sname);
5373         }
5374 }
5375 
5376 static void *
5377 ztest_thread(void *arg)
5378 {
5379         int rand;
5380         uint64_t id = (uintptr_t)arg;
5381         ztest_shared_t *zs = ztest_shared;
5382         uint64_t call_next;
5383         hrtime_t now;
5384         ztest_info_t *zi;
5385         ztest_shared_callstate_t *zc;
5386 
5387         while ((now = gethrtime()) < zs->zs_thread_stop) {
5388                 /*
5389                  * See if it's time to force a crash.
5390                  */
5391                 if (now > zs->zs_thread_kill)
5392                         ztest_kill(zs);
5393 
5394                 /*
5395                  * If we're getting ENOSPC with some regularity, stop.
5396                  */
5397                 if (zs->zs_enospc_count > 10)
5398                         break;
5399 
5400                 /*
5401                  * Pick a random function to execute.
5402                  */
5403                 rand = ztest_random(ZTEST_FUNCS);
5404                 zi = &ztest_info[rand];
5405                 zc = ZTEST_GET_SHARED_CALLSTATE(rand);
5406                 call_next = zc->zc_next;
5407 
5408                 if (now >= call_next &&
5409                     atomic_cas_64(&zc->zc_next, call_next, call_next +
5410                     ztest_random(2 * zi->zi_interval[0] + 1)) == call_next) {
5411                         ztest_execute(rand, zi, id);
5412                 }
5413         }
5414 
5415         return (NULL);
5416 }
5417 
5418 static void
5419 ztest_dataset_name(char *dsname, char *pool, int d)
5420 {
5421         (void) snprintf(dsname, MAXNAMELEN, "%s/ds_%d", pool, d);
5422 }
5423 
5424 static void
5425 ztest_dataset_destroy(int d)
5426 {
5427         char name[MAXNAMELEN];
5428 
5429         ztest_dataset_name(name, ztest_opts.zo_pool, d);
5430 
5431         if (ztest_opts.zo_verbose >= 3)
5432                 (void) printf("Destroying %s to free up space\n", name);
5433 
5434         /*
5435          * Cleanup any non-standard clones and snapshots.  In general,
5436          * ztest thread t operates on dataset (t % zopt_datasets),
5437          * so there may be more than one thing to clean up.
5438          */
5439         for (int t = d; t < ztest_opts.zo_threads;
5440             t += ztest_opts.zo_datasets) {
5441                 ztest_dsl_dataset_cleanup(name, t);
5442         }
5443 
5444         (void) dmu_objset_find(name, ztest_objset_destroy_cb, NULL,
5445             DS_FIND_SNAPSHOTS | DS_FIND_CHILDREN);
5446 }
5447 
5448 static void
5449 ztest_dataset_dirobj_verify(ztest_ds_t *zd)
5450 {
5451         uint64_t usedobjs, dirobjs, scratch;
5452 
5453         /*
5454          * ZTEST_DIROBJ is the object directory for the entire dataset.
5455          * Therefore, the number of objects in use should equal the
5456          * number of ZTEST_DIROBJ entries, +1 for ZTEST_DIROBJ itself.
5457          * If not, we have an object leak.
5458          *
5459          * Note that we can only check this in ztest_dataset_open(),
5460          * when the open-context and syncing-context values agree.
5461          * That's because zap_count() returns the open-context value,
5462          * while dmu_objset_space() returns the rootbp fill count.
5463          */
5464         VERIFY3U(0, ==, zap_count(zd->zd_os, ZTEST_DIROBJ, &dirobjs));
5465         dmu_objset_space(zd->zd_os, &scratch, &scratch, &usedobjs, &scratch);
5466         ASSERT3U(dirobjs + 1, ==, usedobjs);
5467 }
5468 
5469 static int
5470 ztest_dataset_open(int d)
5471 {
5472         ztest_ds_t *zd = &ztest_ds[d];
5473         uint64_t committed_seq = ZTEST_GET_SHARED_DS(d)->zd_seq;
5474         objset_t *os;
5475         zilog_t *zilog;
5476         char name[MAXNAMELEN];
5477         int error;
5478 
5479         ztest_dataset_name(name, ztest_opts.zo_pool, d);
5480 
5481         (void) rw_rdlock(&ztest_name_lock);
5482 
5483         error = ztest_dataset_create(name);
5484         if (error == ENOSPC) {
5485                 (void) rw_unlock(&ztest_name_lock);
5486                 ztest_record_enospc(FTAG);
5487                 return (error);
5488         }
5489         ASSERT(error == 0 || error == EEXIST);
5490 
5491         VERIFY0(dmu_objset_own(name, DMU_OST_OTHER, B_FALSE, zd, &os));
5492         (void) rw_unlock(&ztest_name_lock);
5493 
5494         ztest_zd_init(zd, ZTEST_GET_SHARED_DS(d), os);
5495 
5496         zilog = zd->zd_zilog;
5497 
5498         if (zilog->zl_header->zh_claim_lr_seq != 0 &&
5499             zilog->zl_header->zh_claim_lr_seq < committed_seq)
5500                 fatal(0, "missing log records: claimed %llu < committed %llu",
5501                     zilog->zl_header->zh_claim_lr_seq, committed_seq);
5502 
5503         ztest_dataset_dirobj_verify(zd);
5504 
5505         zil_replay(os, zd, ztest_replay_vector);
5506 
5507         ztest_dataset_dirobj_verify(zd);
5508 
5509         if (ztest_opts.zo_verbose >= 6)
5510                 (void) printf("%s replay %llu blocks, %llu records, seq %llu\n",
5511                     zd->zd_name,
5512                     (u_longlong_t)zilog->zl_parse_blk_count,
5513                     (u_longlong_t)zilog->zl_parse_lr_count,
5514                     (u_longlong_t)zilog->zl_replaying_seq);
5515 
5516         zilog = zil_open(os, ztest_get_data);
5517 
5518         if (zilog->zl_replaying_seq != 0 &&
5519             zilog->zl_replaying_seq < committed_seq)
5520                 fatal(0, "missing log records: replayed %llu < committed %llu",
5521                     zilog->zl_replaying_seq, committed_seq);
5522 
5523         return (0);
5524 }
5525 
5526 static void
5527 ztest_dataset_close(int d)
5528 {
5529         ztest_ds_t *zd = &ztest_ds[d];
5530 
5531         zil_close(zd->zd_zilog);
5532         dmu_objset_disown(zd->zd_os, zd);
5533 
5534         ztest_zd_fini(zd);
5535 }
5536 
5537 /*
5538  * Kick off threads to run tests on all datasets in parallel.
5539  */
5540 static void
5541 ztest_run(ztest_shared_t *zs)
5542 {
5543         thread_t *tid;
5544         spa_t *spa;
5545         objset_t *os;
5546         thread_t resume_tid;
5547         int error;
5548 
5549         ztest_exiting = B_FALSE;
5550 
5551         /*
5552          * Initialize parent/child shared state.
5553          */
5554         VERIFY(_mutex_init(&ztest_vdev_lock, USYNC_THREAD, NULL) == 0);
5555         VERIFY(rwlock_init(&ztest_name_lock, USYNC_THREAD, NULL) == 0);
5556 
5557         zs->zs_thread_start = gethrtime();
5558         zs->zs_thread_stop =
5559             zs->zs_thread_start + ztest_opts.zo_passtime * NANOSEC;
5560         zs->zs_thread_stop = MIN(zs->zs_thread_stop, zs->zs_proc_stop);
5561         zs->zs_thread_kill = zs->zs_thread_stop;
5562         if (ztest_random(100) < ztest_opts.zo_killrate) {
5563                 zs->zs_thread_kill -=
5564                     ztest_random(ztest_opts.zo_passtime * NANOSEC);
5565         }
5566 
5567         (void) _mutex_init(&zcl.zcl_callbacks_lock, USYNC_THREAD, NULL);
5568 
5569         list_create(&zcl.zcl_callbacks, sizeof (ztest_cb_data_t),
5570             offsetof(ztest_cb_data_t, zcd_node));
5571 
5572         /*
5573          * Open our pool.
5574          */
5575         kernel_init(FREAD | FWRITE);
5576         VERIFY0(spa_open(ztest_opts.zo_pool, &spa, FTAG));
5577         spa->spa_debug = B_TRUE;
5578         ztest_spa = spa;
5579 
5580         VERIFY0(dmu_objset_own(ztest_opts.zo_pool,
5581             DMU_OST_ANY, B_TRUE, FTAG, &os));
5582         zs->zs_guid = dmu_objset_fsid_guid(os);
5583         dmu_objset_disown(os, FTAG);
5584 
5585         spa->spa_dedup_ditto = 2 * ZIO_DEDUPDITTO_MIN;
5586 
5587         /*
5588          * We don't expect the pool to suspend unless maxfaults == 0,
5589          * in which case ztest_fault_inject() temporarily takes away
5590          * the only valid replica.
5591          */
5592         if (MAXFAULTS() == 0)
5593                 spa->spa_failmode = ZIO_FAILURE_MODE_WAIT;
5594         else
5595                 spa->spa_failmode = ZIO_FAILURE_MODE_PANIC;
5596 
5597         /*
5598          * Create a thread to periodically resume suspended I/O.
5599          */
5600         VERIFY(thr_create(0, 0, ztest_resume_thread, spa, THR_BOUND,
5601             &resume_tid) == 0);
5602 
5603         /*
5604          * Create a deadman thread to abort() if we hang.
5605          */
5606         VERIFY(thr_create(0, 0, ztest_deadman_thread, zs, THR_BOUND,
5607             NULL) == 0);
5608 
5609         /*
5610          * Verify that we can safely inquire about about any object,
5611          * whether it's allocated or not.  To make it interesting,
5612          * we probe a 5-wide window around each power of two.
5613          * This hits all edge cases, including zero and the max.
5614          */
5615         for (int t = 0; t < 64; t++) {
5616                 for (int d = -5; d <= 5; d++) {
5617                         error = dmu_object_info(spa->spa_meta_objset,
5618                             (1ULL << t) + d, NULL);
5619                         ASSERT(error == 0 || error == ENOENT ||
5620                             error == EINVAL);
5621                 }
5622         }
5623 
5624         /*
5625          * If we got any ENOSPC errors on the previous run, destroy something.
5626          */
5627         if (zs->zs_enospc_count != 0) {
5628                 int d = ztest_random(ztest_opts.zo_datasets);
5629                 ztest_dataset_destroy(d);
5630         }
5631         zs->zs_enospc_count = 0;
5632 
5633         tid = umem_zalloc(ztest_opts.zo_threads * sizeof (thread_t),
5634             UMEM_NOFAIL);
5635 
5636         if (ztest_opts.zo_verbose >= 4)
5637                 (void) printf("starting main threads...\n");
5638 
5639         /*
5640          * Kick off all the tests that run in parallel.
5641          */
5642         for (int t = 0; t < ztest_opts.zo_threads; t++) {
5643                 if (t < ztest_opts.zo_datasets &&
5644                     ztest_dataset_open(t) != 0)
5645                         return;
5646                 VERIFY(thr_create(0, 0, ztest_thread, (void *)(uintptr_t)t,
5647                     THR_BOUND, &tid[t]) == 0);
5648         }
5649 
5650         /*
5651          * Wait for all of the tests to complete.  We go in reverse order
5652          * so we don't close datasets while threads are still using them.
5653          */
5654         for (int t = ztest_opts.zo_threads - 1; t >= 0; t--) {
5655                 VERIFY(thr_join(tid[t], NULL, NULL) == 0);
5656                 if (t < ztest_opts.zo_datasets)
5657                         ztest_dataset_close(t);
5658         }
5659 
5660         txg_wait_synced(spa_get_dsl(spa), 0);
5661 
5662         zs->zs_alloc = metaslab_class_get_alloc(spa_normal_class(spa));
5663         zs->zs_space = metaslab_class_get_space(spa_normal_class(spa));
5664         zfs_dbgmsg_print(FTAG);
5665 
5666         umem_free(tid, ztest_opts.zo_threads * sizeof (thread_t));
5667 
5668         /* Kill the resume thread */
5669         ztest_exiting = B_TRUE;
5670         VERIFY(thr_join(resume_tid, NULL, NULL) == 0);
5671         ztest_resume(spa);
5672 
5673         /*
5674          * Right before closing the pool, kick off a bunch of async I/O;
5675          * spa_close() should wait for it to complete.
5676          */
5677         for (uint64_t object = 1; object < 50; object++)
5678                 dmu_prefetch(spa->spa_meta_objset, object, 0, 1ULL << 20);
5679 
5680         spa_close(spa, FTAG);
5681 
5682         /*
5683          * Verify that we can loop over all pools.
5684          */
5685         mutex_enter(&spa_namespace_lock);
5686         for (spa = spa_next(NULL); spa != NULL; spa = spa_next(spa))
5687                 if (ztest_opts.zo_verbose > 3)
5688                         (void) printf("spa_next: found %s\n", spa_name(spa));
5689         mutex_exit(&spa_namespace_lock);
5690 
5691         /*
5692          * Verify that we can export the pool and reimport it under a
5693          * different name.
5694          */
5695         if (ztest_random(2) == 0) {
5696                 char name[MAXNAMELEN];
5697                 (void) snprintf(name, MAXNAMELEN, "%s_import",
5698                     ztest_opts.zo_pool);
5699                 ztest_spa_import_export(ztest_opts.zo_pool, name);
5700                 ztest_spa_import_export(name, ztest_opts.zo_pool);
5701         }
5702 
5703         kernel_fini();
5704 
5705         list_destroy(&zcl.zcl_callbacks);
5706 
5707         (void) _mutex_destroy(&zcl.zcl_callbacks_lock);
5708 
5709         (void) rwlock_destroy(&ztest_name_lock);
5710         (void) _mutex_destroy(&ztest_vdev_lock);
5711 }
5712 
5713 static void
5714 ztest_freeze(void)
5715 {
5716         ztest_ds_t *zd = &ztest_ds[0];
5717         spa_t *spa;
5718         int numloops = 0;
5719 
5720         if (ztest_opts.zo_verbose >= 3)
5721                 (void) printf("testing spa_freeze()...\n");
5722 
5723         kernel_init(FREAD | FWRITE);
5724         VERIFY3U(0, ==, spa_open(ztest_opts.zo_pool, &spa, FTAG));
5725         VERIFY3U(0, ==, ztest_dataset_open(0));
5726         spa->spa_debug = B_TRUE;
5727         ztest_spa = spa;
5728 
5729         /*
5730          * Force the first log block to be transactionally allocated.
5731          * We have to do this before we freeze the pool -- otherwise
5732          * the log chain won't be anchored.
5733          */
5734         while (BP_IS_HOLE(&zd->zd_zilog->zl_header->zh_log)) {
5735                 ztest_dmu_object_alloc_free(zd, 0);
5736                 zil_commit(zd->zd_zilog, 0);
5737         }
5738 
5739         txg_wait_synced(spa_get_dsl(spa), 0);
5740 
5741         /*
5742          * Freeze the pool.  This stops spa_sync() from doing anything,
5743          * so that the only way to record changes from now on is the ZIL.
5744          */
5745         spa_freeze(spa);
5746 
5747         /*
5748          * Run tests that generate log records but don't alter the pool config
5749          * or depend on DSL sync tasks (snapshots, objset create/destroy, etc).
5750          * We do a txg_wait_synced() after each iteration to force the txg
5751          * to increase well beyond the last synced value in the uberblock.
5752          * The ZIL should be OK with that.
5753          */
5754         while (ztest_random(10) != 0 &&
5755             numloops++ < ztest_opts.zo_maxloops) {
5756                 ztest_dmu_write_parallel(zd, 0);
5757                 ztest_dmu_object_alloc_free(zd, 0);
5758                 txg_wait_synced(spa_get_dsl(spa), 0);
5759         }
5760 
5761         /*
5762          * Commit all of the changes we just generated.
5763          */
5764         zil_commit(zd->zd_zilog, 0);
5765         txg_wait_synced(spa_get_dsl(spa), 0);
5766 
5767         /*
5768          * Close our dataset and close the pool.
5769          */
5770         ztest_dataset_close(0);
5771         spa_close(spa, FTAG);
5772         kernel_fini();
5773 
5774         /*
5775          * Open and close the pool and dataset to induce log replay.
5776          */
5777         kernel_init(FREAD | FWRITE);
5778         VERIFY3U(0, ==, spa_open(ztest_opts.zo_pool, &spa, FTAG));
5779         ASSERT(spa_freeze_txg(spa) == UINT64_MAX);
5780         VERIFY3U(0, ==, ztest_dataset_open(0));
5781         ztest_dataset_close(0);
5782 
5783         spa->spa_debug = B_TRUE;
5784         ztest_spa = spa;
5785         txg_wait_synced(spa_get_dsl(spa), 0);
5786         ztest_reguid(NULL, 0);
5787 
5788         spa_close(spa, FTAG);
5789         kernel_fini();
5790 }
5791 
5792 void
5793 print_time(hrtime_t t, char *timebuf)
5794 {
5795         hrtime_t s = t / NANOSEC;
5796         hrtime_t m = s / 60;
5797         hrtime_t h = m / 60;
5798         hrtime_t d = h / 24;
5799 
5800         s -= m * 60;
5801         m -= h * 60;
5802         h -= d * 24;
5803 
5804         timebuf[0] = '\0';
5805 
5806         if (d)
5807                 (void) sprintf(timebuf,
5808                     "%llud%02lluh%02llum%02llus", d, h, m, s);
5809         else if (h)
5810                 (void) sprintf(timebuf, "%lluh%02llum%02llus", h, m, s);
5811         else if (m)
5812                 (void) sprintf(timebuf, "%llum%02llus", m, s);
5813         else
5814                 (void) sprintf(timebuf, "%llus", s);
5815 }
5816 
5817 static nvlist_t *
5818 make_random_props()
5819 {
5820         nvlist_t *props;
5821 
5822         VERIFY(nvlist_alloc(&props, NV_UNIQUE_NAME, 0) == 0);
5823         if (ztest_random(2) == 0)
5824                 return (props);
5825         VERIFY(nvlist_add_uint64(props, "autoreplace", 1) == 0);
5826 
5827         return (props);
5828 }
5829 
5830 /*
5831  * Create a storage pool with the given name and initial vdev size.
5832  * Then test spa_freeze() functionality.
5833  */
5834 static void
5835 ztest_init(ztest_shared_t *zs)
5836 {
5837         spa_t *spa;
5838         nvlist_t *nvroot, *props;
5839 
5840         VERIFY(_mutex_init(&ztest_vdev_lock, USYNC_THREAD, NULL) == 0);
5841         VERIFY(rwlock_init(&ztest_name_lock, USYNC_THREAD, NULL) == 0);
5842 
5843         kernel_init(FREAD | FWRITE);
5844 
5845         /*
5846          * Create the storage pool.
5847          */
5848         (void) spa_destroy(ztest_opts.zo_pool);
5849         ztest_shared->zs_vdev_next_leaf = 0;
5850         zs->zs_splits = 0;
5851         zs->zs_mirrors = ztest_opts.zo_mirrors;
5852         nvroot = make_vdev_root(NULL, NULL, NULL, ztest_opts.zo_vdev_size, 0,
5853             0, ztest_opts.zo_raidz, zs->zs_mirrors, 1);
5854         props = make_random_props();
5855         for (int i = 0; i < SPA_FEATURES; i++) {
5856                 char buf[1024];
5857                 (void) snprintf(buf, sizeof (buf), "feature@%s",
5858                     spa_feature_table[i].fi_uname);
5859                 VERIFY3U(0, ==, nvlist_add_uint64(props, buf, 0));
5860         }
5861         VERIFY3U(0, ==, spa_create(ztest_opts.zo_pool, nvroot, props, NULL));
5862         nvlist_free(nvroot);
5863 
5864         VERIFY3U(0, ==, spa_open(ztest_opts.zo_pool, &spa, FTAG));
5865         zs->zs_metaslab_sz =
5866             1ULL << spa->spa_root_vdev->vdev_child[0]->vdev_ms_shift;
5867 
5868         spa_close(spa, FTAG);
5869 
5870         kernel_fini();
5871 
5872         ztest_run_zdb(ztest_opts.zo_pool);
5873 
5874         ztest_freeze();
5875 
5876         ztest_run_zdb(ztest_opts.zo_pool);
5877 
5878         (void) rwlock_destroy(&ztest_name_lock);
5879         (void) _mutex_destroy(&ztest_vdev_lock);
5880 }
5881 
5882 static void
5883 setup_data_fd(void)
5884 {
5885         static char ztest_name_data[] = "/tmp/ztest.data.XXXXXX";
5886 
5887         ztest_fd_data = mkstemp(ztest_name_data);
5888         ASSERT3S(ztest_fd_data, >=, 0);
5889         (void) unlink(ztest_name_data);
5890 }
5891 
5892 
5893 static int
5894 shared_data_size(ztest_shared_hdr_t *hdr)
5895 {
5896         int size;
5897 
5898         size = hdr->zh_hdr_size;
5899         size += hdr->zh_opts_size;
5900         size += hdr->zh_size;
5901         size += hdr->zh_stats_size * hdr->zh_stats_count;
5902         size += hdr->zh_ds_size * hdr->zh_ds_count;
5903 
5904         return (size);
5905 }
5906 
5907 static void
5908 setup_hdr(void)
5909 {
5910         int size;
5911         ztest_shared_hdr_t *hdr;
5912 
5913         hdr = (void *)mmap(0, P2ROUNDUP(sizeof (*hdr), getpagesize()),
5914             PROT_READ | PROT_WRITE, MAP_SHARED, ztest_fd_data, 0);
5915         ASSERT(hdr != MAP_FAILED);
5916 
5917         VERIFY3U(0, ==, ftruncate(ztest_fd_data, sizeof (ztest_shared_hdr_t)));
5918 
5919         hdr->zh_hdr_size = sizeof (ztest_shared_hdr_t);
5920         hdr->zh_opts_size = sizeof (ztest_shared_opts_t);
5921         hdr->zh_size = sizeof (ztest_shared_t);
5922         hdr->zh_stats_size = sizeof (ztest_shared_callstate_t);
5923         hdr->zh_stats_count = ZTEST_FUNCS;
5924         hdr->zh_ds_size = sizeof (ztest_shared_ds_t);
5925         hdr->zh_ds_count = ztest_opts.zo_datasets;
5926 
5927         size = shared_data_size(hdr);
5928         VERIFY3U(0, ==, ftruncate(ztest_fd_data, size));
5929 
5930         (void) munmap((caddr_t)hdr, P2ROUNDUP(sizeof (*hdr), getpagesize()));
5931 }
5932 
5933 static void
5934 setup_data(void)
5935 {
5936         int size, offset;
5937         ztest_shared_hdr_t *hdr;
5938         uint8_t *buf;
5939 
5940         hdr = (void *)mmap(0, P2ROUNDUP(sizeof (*hdr), getpagesize()),
5941             PROT_READ, MAP_SHARED, ztest_fd_data, 0);
5942         ASSERT(hdr != MAP_FAILED);
5943 
5944         size = shared_data_size(hdr);
5945 
5946         (void) munmap((caddr_t)hdr, P2ROUNDUP(sizeof (*hdr), getpagesize()));
5947         hdr = ztest_shared_hdr = (void *)mmap(0, P2ROUNDUP(size, getpagesize()),
5948             PROT_READ | PROT_WRITE, MAP_SHARED, ztest_fd_data, 0);
5949         ASSERT(hdr != MAP_FAILED);
5950         buf = (uint8_t *)hdr;
5951 
5952         offset = hdr->zh_hdr_size;
5953         ztest_shared_opts = (void *)&buf[offset];
5954         offset += hdr->zh_opts_size;
5955         ztest_shared = (void *)&buf[offset];
5956         offset += hdr->zh_size;
5957         ztest_shared_callstate = (void *)&buf[offset];
5958         offset += hdr->zh_stats_size * hdr->zh_stats_count;
5959         ztest_shared_ds = (void *)&buf[offset];
5960 }
5961 
5962 static boolean_t
5963 exec_child(char *cmd, char *libpath, boolean_t ignorekill, int *statusp)
5964 {
5965         pid_t pid;
5966         int status;
5967         char *cmdbuf = NULL;
5968 
5969         pid = fork();
5970 
5971         if (cmd == NULL) {
5972                 cmdbuf = umem_alloc(MAXPATHLEN, UMEM_NOFAIL);
5973                 (void) strlcpy(cmdbuf, getexecname(), MAXPATHLEN);
5974                 cmd = cmdbuf;
5975         }
5976 
5977         if (pid == -1)
5978                 fatal(1, "fork failed");
5979 
5980         if (pid == 0) { /* child */
5981                 char *emptyargv[2] = { cmd, NULL };
5982                 char fd_data_str[12];
5983 
5984                 struct rlimit rl = { 1024, 1024 };
5985                 (void) setrlimit(RLIMIT_NOFILE, &rl);
5986 
5987                 (void) close(ztest_fd_rand);
5988                 VERIFY3U(11, >=,
5989                     snprintf(fd_data_str, 12, "%d", ztest_fd_data));
5990                 VERIFY0(setenv("ZTEST_FD_DATA", fd_data_str, 1));
5991 
5992                 (void) enable_extended_FILE_stdio(-1, -1);
5993                 if (libpath != NULL)
5994                         VERIFY(0 == setenv("LD_LIBRARY_PATH", libpath, 1));
5995                 (void) execv(cmd, emptyargv);
5996                 ztest_dump_core = B_FALSE;
5997                 fatal(B_TRUE, "exec failed: %s", cmd);
5998         }
5999 
6000         if (cmdbuf != NULL) {
6001                 umem_free(cmdbuf, MAXPATHLEN);
6002                 cmd = NULL;
6003         }
6004 
6005         while (waitpid(pid, &status, 0) != pid)
6006                 continue;
6007         if (statusp != NULL)
6008                 *statusp = status;
6009 
6010         if (WIFEXITED(status)) {
6011                 if (WEXITSTATUS(status) != 0) {
6012                         (void) fprintf(stderr, "child exited with code %d\n",
6013                             WEXITSTATUS(status));
6014                         exit(2);
6015                 }
6016                 return (B_FALSE);
6017         } else if (WIFSIGNALED(status)) {
6018                 if (!ignorekill || WTERMSIG(status) != SIGKILL) {
6019                         (void) fprintf(stderr, "child died with signal %d\n",
6020                             WTERMSIG(status));
6021                         exit(3);
6022                 }
6023                 return (B_TRUE);
6024         } else {
6025                 (void) fprintf(stderr, "something strange happened to child\n");
6026                 exit(4);
6027                 /* NOTREACHED */
6028         }
6029 }
6030 
6031 static void
6032 ztest_run_init(void)
6033 {
6034         ztest_shared_t *zs = ztest_shared;
6035 
6036         ASSERT(ztest_opts.zo_init != 0);
6037 
6038         /*
6039          * Blow away any existing copy of zpool.cache
6040          */
6041         (void) remove(spa_config_path);
6042 
6043         /*
6044          * Create and initialize our storage pool.
6045          */
6046         for (int i = 1; i <= ztest_opts.zo_init; i++) {
6047                 bzero(zs, sizeof (ztest_shared_t));
6048                 if (ztest_opts.zo_verbose >= 3 &&
6049                     ztest_opts.zo_init != 1) {
6050                         (void) printf("ztest_init(), pass %d\n", i);
6051                 }
6052                 ztest_init(zs);
6053         }
6054 }
6055 
6056 int
6057 main(int argc, char **argv)
6058 {
6059         int kills = 0;
6060         int iters = 0;
6061         int older = 0;
6062         int newer = 0;
6063         ztest_shared_t *zs;
6064         ztest_info_t *zi;
6065         ztest_shared_callstate_t *zc;
6066         char timebuf[100];
6067         char numbuf[6];
6068         spa_t *spa;
6069         char *cmd;
6070         boolean_t hasalt;
6071         char *fd_data_str = getenv("ZTEST_FD_DATA");
6072 
6073         (void) setvbuf(stdout, NULL, _IOLBF, 0);
6074 
6075         dprintf_setup(&argc, argv);
6076         zfs_deadman_synctime = 300;
6077 
6078         ztest_fd_rand = open("/dev/urandom", O_RDONLY);
6079         ASSERT3S(ztest_fd_rand, >=, 0);
6080 
6081         if (!fd_data_str) {
6082                 process_options(argc, argv);
6083 
6084                 setup_data_fd();
6085                 setup_hdr();
6086                 setup_data();
6087                 bcopy(&ztest_opts, ztest_shared_opts,
6088                     sizeof (*ztest_shared_opts));
6089         } else {
6090                 ztest_fd_data = atoi(fd_data_str);
6091                 setup_data();
6092                 bcopy(ztest_shared_opts, &ztest_opts, sizeof (ztest_opts));
6093         }
6094         ASSERT3U(ztest_opts.zo_datasets, ==, ztest_shared_hdr->zh_ds_count);
6095 
6096         /* Override location of zpool.cache */
6097         VERIFY3U(asprintf((char **)&spa_config_path, "%s/zpool.cache",
6098             ztest_opts.zo_dir), !=, -1);
6099 
6100         ztest_ds = umem_alloc(ztest_opts.zo_datasets * sizeof (ztest_ds_t),
6101             UMEM_NOFAIL);
6102         zs = ztest_shared;
6103 
6104         if (fd_data_str) {
6105                 metaslab_gang_bang = ztest_opts.zo_metaslab_gang_bang;
6106                 metaslab_df_alloc_threshold =
6107                     zs->zs_metaslab_df_alloc_threshold;
6108 
6109                 if (zs->zs_do_init)
6110                         ztest_run_init();
6111                 else
6112                         ztest_run(zs);
6113                 exit(0);
6114         }
6115 
6116         hasalt = (strlen(ztest_opts.zo_alt_ztest) != 0);
6117 
6118         if (ztest_opts.zo_verbose >= 1) {
6119                 (void) printf("%llu vdevs, %d datasets, %d threads,"
6120                     " %llu seconds...\n",
6121                     (u_longlong_t)ztest_opts.zo_vdevs,
6122                     ztest_opts.zo_datasets,
6123                     ztest_opts.zo_threads,
6124                     (u_longlong_t)ztest_opts.zo_time);
6125         }
6126 
6127         cmd = umem_alloc(MAXNAMELEN, UMEM_NOFAIL);
6128         (void) strlcpy(cmd, getexecname(), MAXNAMELEN);
6129 
6130         zs->zs_do_init = B_TRUE;
6131         if (strlen(ztest_opts.zo_alt_ztest) != 0) {
6132                 if (ztest_opts.zo_verbose >= 1) {
6133                         (void) printf("Executing older ztest for "
6134                             "initialization: %s\n", ztest_opts.zo_alt_ztest);
6135                 }
6136                 VERIFY(!exec_child(ztest_opts.zo_alt_ztest,
6137                     ztest_opts.zo_alt_libpath, B_FALSE, NULL));
6138         } else {
6139                 VERIFY(!exec_child(NULL, NULL, B_FALSE, NULL));
6140         }
6141         zs->zs_do_init = B_FALSE;
6142 
6143         zs->zs_proc_start = gethrtime();
6144         zs->zs_proc_stop = zs->zs_proc_start + ztest_opts.zo_time * NANOSEC;
6145 
6146         for (int f = 0; f < ZTEST_FUNCS; f++) {
6147                 zi = &ztest_info[f];
6148                 zc = ZTEST_GET_SHARED_CALLSTATE(f);
6149                 if (zs->zs_proc_start + zi->zi_interval[0] > zs->zs_proc_stop)
6150                         zc->zc_next = UINT64_MAX;
6151                 else
6152                         zc->zc_next = zs->zs_proc_start +
6153                             ztest_random(2 * zi->zi_interval[0] + 1);
6154         }
6155 
6156         /*
6157          * Run the tests in a loop.  These tests include fault injection
6158          * to verify that self-healing data works, and forced crashes
6159          * to verify that we never lose on-disk consistency.
6160          */
6161         while (gethrtime() < zs->zs_proc_stop) {
6162                 int status;
6163                 boolean_t killed;
6164 
6165                 /*
6166                  * Initialize the workload counters for each function.
6167                  */
6168                 for (int f = 0; f < ZTEST_FUNCS; f++) {
6169                         zc = ZTEST_GET_SHARED_CALLSTATE(f);
6170                         zc->zc_count = 0;
6171                         zc->zc_time = 0;
6172                 }
6173 
6174                 /* Set the allocation switch size */
6175                 zs->zs_metaslab_df_alloc_threshold =
6176                     ztest_random(zs->zs_metaslab_sz / 4) + 1;
6177 
6178                 if (!hasalt || ztest_random(2) == 0) {
6179                         if (hasalt && ztest_opts.zo_verbose >= 1) {
6180                                 (void) printf("Executing newer ztest: %s\n",
6181                                     cmd);
6182                         }
6183                         newer++;
6184                         killed = exec_child(cmd, NULL, B_TRUE, &status);
6185                 } else {
6186                         if (hasalt && ztest_opts.zo_verbose >= 1) {
6187                                 (void) printf("Executing older ztest: %s\n",
6188                                     ztest_opts.zo_alt_ztest);
6189                         }
6190                         older++;
6191                         killed = exec_child(ztest_opts.zo_alt_ztest,
6192                             ztest_opts.zo_alt_libpath, B_TRUE, &status);
6193                 }
6194 
6195                 if (killed)
6196                         kills++;
6197                 iters++;
6198 
6199                 if (ztest_opts.zo_verbose >= 1) {
6200                         hrtime_t now = gethrtime();
6201 
6202                         now = MIN(now, zs->zs_proc_stop);
6203                         print_time(zs->zs_proc_stop - now, timebuf);
6204                         nicenum(zs->zs_space, numbuf);
6205 
6206                         (void) printf("Pass %3d, %8s, %3llu ENOSPC, "
6207                             "%4.1f%% of %5s used, %3.0f%% done, %8s to go\n",
6208                             iters,
6209                             WIFEXITED(status) ? "Complete" : "SIGKILL",
6210                             (u_longlong_t)zs->zs_enospc_count,
6211                             100.0 * zs->zs_alloc / zs->zs_space,
6212                             numbuf,
6213                             100.0 * (now - zs->zs_proc_start) /
6214                             (ztest_opts.zo_time * NANOSEC), timebuf);
6215                 }
6216 
6217                 if (ztest_opts.zo_verbose >= 2) {
6218                         (void) printf("\nWorkload summary:\n\n");
6219                         (void) printf("%7s %9s   %s\n",
6220                             "Calls", "Time", "Function");
6221                         (void) printf("%7s %9s   %s\n",
6222                             "-----", "----", "--------");
6223                         for (int f = 0; f < ZTEST_FUNCS; f++) {
6224                                 Dl_info dli;
6225 
6226                                 zi = &ztest_info[f];
6227                                 zc = ZTEST_GET_SHARED_CALLSTATE(f);
6228                                 print_time(zc->zc_time, timebuf);
6229                                 (void) dladdr((void *)zi->zi_func, &dli);
6230                                 (void) printf("%7llu %9s   %s\n",
6231                                     (u_longlong_t)zc->zc_count, timebuf,
6232                                     dli.dli_sname);
6233                         }
6234                         (void) printf("\n");
6235                 }
6236 
6237                 /*
6238                  * It's possible that we killed a child during a rename test,
6239                  * in which case we'll have a 'ztest_tmp' pool lying around
6240                  * instead of 'ztest'.  Do a blind rename in case this happened.
6241                  */
6242                 kernel_init(FREAD);
6243                 if (spa_open(ztest_opts.zo_pool, &spa, FTAG) == 0) {
6244                         spa_close(spa, FTAG);
6245                 } else {
6246                         char tmpname[MAXNAMELEN];
6247                         kernel_fini();
6248                         kernel_init(FREAD | FWRITE);
6249                         (void) snprintf(tmpname, sizeof (tmpname), "%s_tmp",
6250                             ztest_opts.zo_pool);
6251                         (void) spa_rename(tmpname, ztest_opts.zo_pool);
6252                 }
6253                 kernel_fini();
6254 
6255                 ztest_run_zdb(ztest_opts.zo_pool);
6256         }
6257 
6258         if (ztest_opts.zo_verbose >= 1) {
6259                 if (hasalt) {
6260                         (void) printf("%d runs of older ztest: %s\n", older,
6261                             ztest_opts.zo_alt_ztest);
6262                         (void) printf("%d runs of newer ztest: %s\n", newer,
6263                             cmd);
6264                 }
6265                 (void) printf("%d killed, %d completed, %.0f%% kill rate\n",
6266                     kills, iters - kills, (100.0 * kills) / MAX(1, iters));
6267         }
6268 
6269         umem_free(cmd, MAXNAMELEN);
6270 
6271         return (0);
6272 }