xref: /illumos-gate/usr/src/cmd/mdb/common/modules/zfs/zfs.c (revision 8a2b682e57a046b828f37bcde1776f131ef4629f)
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 2011 Nexenta Systems, Inc. All rights reserved.
24  * Copyright (c) 2011, 2018 by Delphix. All rights reserved.
25  * Copyright 2019 Joyent, Inc.
26  */
27 
28 /* Portions Copyright 2010 Robert Milkowski */
29 
30 /*
31  * ZFS_MDB lets dmu.h know that we don't have dmu_ot, and we will define our
32  * own macros to access the target's dmu_ot.  Therefore it must be defined
33  * before including any ZFS headers.  Note that we don't define
34  * DMU_OT_IS_ENCRYPTED_IMPL() or DMU_OT_BYTESWAP_IMPL(), therefore using them
35  * will result in a compilation error.  If they are needed in the future, we
36  * can implement them similarly to mdb_dmu_ot_is_encrypted_impl().
37  */
38 #define	ZFS_MDB
39 #define	DMU_OT_IS_ENCRYPTED_IMPL(ot) mdb_dmu_ot_is_encrypted_impl(ot)
40 
41 #include <mdb/mdb_ctf.h>
42 #include <sys/zfs_context.h>
43 #include <sys/mdb_modapi.h>
44 #include <sys/dbuf.h>
45 #include <sys/dmu_objset.h>
46 #include <sys/dsl_dir.h>
47 #include <sys/dsl_pool.h>
48 #include <sys/metaslab_impl.h>
49 #include <sys/space_map.h>
50 #include <sys/list.h>
51 #include <sys/vdev_impl.h>
52 #include <sys/zap_leaf.h>
53 #include <sys/zap_impl.h>
54 #include <ctype.h>
55 #include <sys/zfs_acl.h>
56 #include <sys/sa_impl.h>
57 #include <sys/multilist.h>
58 #include <sys/btree.h>
59 
60 #ifdef _KERNEL
61 #define	ZFS_OBJ_NAME	"zfs"
62 extern int64_t mdb_gethrtime(void);
63 #else
64 #define	ZFS_OBJ_NAME	"libzpool.so.1"
65 #endif
66 
67 #define	ZFS_STRUCT	"struct " ZFS_OBJ_NAME "`"
68 
69 #ifndef _KERNEL
70 int aok;
71 #endif
72 
73 enum spa_flags {
74 	SPA_FLAG_CONFIG			= 1 << 0,
75 	SPA_FLAG_VDEVS			= 1 << 1,
76 	SPA_FLAG_ERRORS			= 1 << 2,
77 	SPA_FLAG_METASLAB_GROUPS	= 1 << 3,
78 	SPA_FLAG_METASLABS		= 1 << 4,
79 	SPA_FLAG_HISTOGRAMS		= 1 << 5
80 };
81 
82 /*
83  * If any of these flags are set, call spa_vdevs in spa_print
84  */
85 #define	SPA_FLAG_ALL_VDEV	\
86 	(SPA_FLAG_VDEVS | SPA_FLAG_ERRORS | SPA_FLAG_METASLAB_GROUPS | \
87 	SPA_FLAG_METASLABS)
88 
89 static int
90 getmember(uintptr_t addr, const char *type, mdb_ctf_id_t *idp,
91     const char *member, int len, void *buf)
92 {
93 	mdb_ctf_id_t id;
94 	ulong_t off;
95 	char name[64];
96 
97 	if (idp == NULL) {
98 		if (mdb_ctf_lookup_by_name(type, &id) == -1) {
99 			mdb_warn("couldn't find type %s", type);
100 			return (DCMD_ERR);
101 		}
102 		idp = &id;
103 	} else {
104 		type = name;
105 		mdb_ctf_type_name(*idp, name, sizeof (name));
106 	}
107 
108 	if (mdb_ctf_offsetof(*idp, member, &off) == -1) {
109 		mdb_warn("couldn't find member %s of type %s\n", member, type);
110 		return (DCMD_ERR);
111 	}
112 	if (off % 8 != 0) {
113 		mdb_warn("member %s of type %s is unsupported bitfield",
114 		    member, type);
115 		return (DCMD_ERR);
116 	}
117 	off /= 8;
118 
119 	if (mdb_vread(buf, len, addr + off) == -1) {
120 		mdb_warn("failed to read %s from %s at %p",
121 		    member, type, addr + off);
122 		return (DCMD_ERR);
123 	}
124 	/* mdb_warn("read %s from %s at %p+%llx\n", member, type, addr, off); */
125 
126 	return (0);
127 }
128 
129 #define	GETMEMB(addr, structname, member, dest) \
130 	getmember(addr, ZFS_STRUCT structname, NULL, #member, \
131 	sizeof (dest), &(dest))
132 
133 #define	GETMEMBID(addr, ctfid, member, dest) \
134 	getmember(addr, NULL, ctfid, #member, sizeof (dest), &(dest))
135 
136 static boolean_t
137 strisprint(const char *cp)
138 {
139 	for (; *cp; cp++) {
140 		if (!isprint(*cp))
141 			return (B_FALSE);
142 	}
143 	return (B_TRUE);
144 }
145 
146 /*
147  * <addr>::sm_entries <buffer length in bytes>
148  *
149  * Treat the buffer specified by the given address as a buffer that contains
150  * space map entries. Iterate over the specified number of entries and print
151  * them in both encoded and decoded form.
152  */
153 /* ARGSUSED */
154 static int
155 sm_entries(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
156 {
157 	uint64_t bufsz = 0;
158 	boolean_t preview = B_FALSE;
159 
160 	if (!(flags & DCMD_ADDRSPEC))
161 		return (DCMD_USAGE);
162 
163 	if (argc < 1) {
164 		preview = B_TRUE;
165 		bufsz = 2;
166 	} else if (argc != 1) {
167 		return (DCMD_USAGE);
168 	} else {
169 		switch (argv[0].a_type) {
170 		case MDB_TYPE_STRING:
171 			bufsz = mdb_strtoull(argv[0].a_un.a_str);
172 			break;
173 		case MDB_TYPE_IMMEDIATE:
174 			bufsz = argv[0].a_un.a_val;
175 			break;
176 		default:
177 			return (DCMD_USAGE);
178 		}
179 	}
180 
181 	char *actions[] = { "ALLOC", "FREE", "INVALID" };
182 	for (uintptr_t bufend = addr + bufsz; addr < bufend;
183 	    addr += sizeof (uint64_t)) {
184 		uint64_t nwords;
185 		uint64_t start_addr = addr;
186 
187 		uint64_t word = 0;
188 		if (mdb_vread(&word, sizeof (word), addr) == -1) {
189 			mdb_warn("failed to read space map entry %p", addr);
190 			return (DCMD_ERR);
191 		}
192 
193 		if (SM_PREFIX_DECODE(word) == SM_DEBUG_PREFIX) {
194 			(void) mdb_printf("\t    [%6llu] %s: txg %llu, "
195 			    "pass %llu\n",
196 			    (u_longlong_t)(addr),
197 			    actions[SM_DEBUG_ACTION_DECODE(word)],
198 			    (u_longlong_t)SM_DEBUG_TXG_DECODE(word),
199 			    (u_longlong_t)SM_DEBUG_SYNCPASS_DECODE(word));
200 			continue;
201 		}
202 
203 		char entry_type;
204 		uint64_t raw_offset, raw_run, vdev_id = SM_NO_VDEVID;
205 
206 		if (SM_PREFIX_DECODE(word) != SM2_PREFIX) {
207 			entry_type = (SM_TYPE_DECODE(word) == SM_ALLOC) ?
208 			    'A' : 'F';
209 			raw_offset = SM_OFFSET_DECODE(word);
210 			raw_run = SM_RUN_DECODE(word);
211 			nwords = 1;
212 		} else {
213 			ASSERT3U(SM_PREFIX_DECODE(word), ==, SM2_PREFIX);
214 
215 			raw_run = SM2_RUN_DECODE(word);
216 			vdev_id = SM2_VDEV_DECODE(word);
217 
218 			/* it is a two-word entry so we read another word */
219 			addr += sizeof (uint64_t);
220 			if (addr >= bufend) {
221 				mdb_warn("buffer ends in the middle of a two "
222 				    "word entry\n", addr);
223 				return (DCMD_ERR);
224 			}
225 
226 			if (mdb_vread(&word, sizeof (word), addr) == -1) {
227 				mdb_warn("failed to read space map entry %p",
228 				    addr);
229 				return (DCMD_ERR);
230 			}
231 
232 			entry_type = (SM2_TYPE_DECODE(word) == SM_ALLOC) ?
233 			    'A' : 'F';
234 			raw_offset = SM2_OFFSET_DECODE(word);
235 			nwords = 2;
236 		}
237 
238 		(void) mdb_printf("\t    [%6llx]    %c  range:"
239 		    " %010llx-%010llx  size: %06llx vdev: %06llu words: %llu\n",
240 		    (u_longlong_t)start_addr,
241 		    entry_type, (u_longlong_t)raw_offset,
242 		    (u_longlong_t)(raw_offset + raw_run),
243 		    (u_longlong_t)raw_run,
244 		    (u_longlong_t)vdev_id, (u_longlong_t)nwords);
245 
246 		if (preview)
247 			break;
248 	}
249 	return (DCMD_OK);
250 }
251 
252 static int
253 mdb_dsl_dir_name(uintptr_t addr, char *buf)
254 {
255 	static int gotid;
256 	static mdb_ctf_id_t dd_id;
257 	uintptr_t dd_parent;
258 	char dd_myname[ZFS_MAX_DATASET_NAME_LEN];
259 
260 	if (!gotid) {
261 		if (mdb_ctf_lookup_by_name(ZFS_STRUCT "dsl_dir",
262 		    &dd_id) == -1) {
263 			mdb_warn("couldn't find struct dsl_dir");
264 			return (DCMD_ERR);
265 		}
266 		gotid = TRUE;
267 	}
268 	if (GETMEMBID(addr, &dd_id, dd_parent, dd_parent) ||
269 	    GETMEMBID(addr, &dd_id, dd_myname, dd_myname)) {
270 		return (DCMD_ERR);
271 	}
272 
273 	if (dd_parent) {
274 		if (mdb_dsl_dir_name(dd_parent, buf))
275 			return (DCMD_ERR);
276 		strcat(buf, "/");
277 	}
278 
279 	if (dd_myname[0])
280 		strcat(buf, dd_myname);
281 	else
282 		strcat(buf, "???");
283 
284 	return (0);
285 }
286 
287 static int
288 objset_name(uintptr_t addr, char *buf)
289 {
290 	static int gotid;
291 	static mdb_ctf_id_t os_id, ds_id;
292 	uintptr_t os_dsl_dataset;
293 	char ds_snapname[ZFS_MAX_DATASET_NAME_LEN];
294 	uintptr_t ds_dir;
295 
296 	buf[0] = '\0';
297 
298 	if (!gotid) {
299 		if (mdb_ctf_lookup_by_name(ZFS_STRUCT "objset",
300 		    &os_id) == -1) {
301 			mdb_warn("couldn't find struct objset");
302 			return (DCMD_ERR);
303 		}
304 		if (mdb_ctf_lookup_by_name(ZFS_STRUCT "dsl_dataset",
305 		    &ds_id) == -1) {
306 			mdb_warn("couldn't find struct dsl_dataset");
307 			return (DCMD_ERR);
308 		}
309 
310 		gotid = TRUE;
311 	}
312 
313 	if (GETMEMBID(addr, &os_id, os_dsl_dataset, os_dsl_dataset))
314 		return (DCMD_ERR);
315 
316 	if (os_dsl_dataset == 0) {
317 		strcat(buf, "mos");
318 		return (0);
319 	}
320 
321 	if (GETMEMBID(os_dsl_dataset, &ds_id, ds_snapname, ds_snapname) ||
322 	    GETMEMBID(os_dsl_dataset, &ds_id, ds_dir, ds_dir)) {
323 		return (DCMD_ERR);
324 	}
325 
326 	if (ds_dir && mdb_dsl_dir_name(ds_dir, buf))
327 		return (DCMD_ERR);
328 
329 	if (ds_snapname[0]) {
330 		strcat(buf, "@");
331 		strcat(buf, ds_snapname);
332 	}
333 	return (0);
334 }
335 
336 static int
337 enum_lookup(char *type, int val, const char *prefix, size_t size, char *out)
338 {
339 	const char *cp;
340 	size_t len = strlen(prefix);
341 	mdb_ctf_id_t enum_type;
342 
343 	if (mdb_ctf_lookup_by_name(type, &enum_type) != 0) {
344 		mdb_warn("Could not find enum for %s", type);
345 		return (-1);
346 	}
347 
348 	if ((cp = mdb_ctf_enum_name(enum_type, val)) != NULL) {
349 		if (strncmp(cp, prefix, len) == 0)
350 			cp += len;
351 		(void) strncpy(out, cp, size);
352 	} else {
353 		mdb_snprintf(out, size, "? (%d)", val);
354 	}
355 	return (0);
356 }
357 
358 /* ARGSUSED */
359 static int
360 zfs_params(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
361 {
362 	/*
363 	 * This table can be approximately generated by running:
364 	 * egrep "^[a-z0-9_]+ [a-z0-9_]+( =.*)?;" *.c | cut -d ' ' -f 2
365 	 */
366 	static const char *params[] = {
367 		"arc_lotsfree_percent",
368 		"arc_pages_pp_reserve",
369 		"arc_reduce_dnlc_percent",
370 		"arc_swapfs_reserve",
371 		"arc_zio_arena_free_shift",
372 		"dbuf_cache_hiwater_pct",
373 		"dbuf_cache_lowater_pct",
374 		"dbuf_cache_max_bytes",
375 		"dbuf_cache_max_shift",
376 		"ddt_zap_indirect_blockshift",
377 		"ddt_zap_leaf_blockshift",
378 		"ditto_same_vdev_distance_shift",
379 		"dmu_find_threads",
380 		"dmu_rescan_dnode_threshold",
381 		"dsl_scan_delay_completion",
382 		"fzap_default_block_shift",
383 		"l2arc_feed_again",
384 		"l2arc_feed_min_ms",
385 		"l2arc_feed_secs",
386 		"l2arc_headroom",
387 		"l2arc_headroom_boost",
388 		"l2arc_noprefetch",
389 		"l2arc_norw",
390 		"l2arc_write_boost",
391 		"l2arc_write_max",
392 		"metaslab_aliquot",
393 		"metaslab_bias_enabled",
394 		"metaslab_debug_load",
395 		"metaslab_debug_unload",
396 		"metaslab_df_alloc_threshold",
397 		"metaslab_df_free_pct",
398 		"metaslab_fragmentation_factor_enabled",
399 		"metaslab_force_ganging",
400 		"metaslab_lba_weighting_enabled",
401 		"metaslab_load_pct",
402 		"metaslab_min_alloc_size",
403 		"metaslab_ndf_clump_shift",
404 		"metaslab_preload_enabled",
405 		"metaslab_preload_limit",
406 		"metaslab_trace_enabled",
407 		"metaslab_trace_max_entries",
408 		"metaslab_unload_delay",
409 		"metaslabs_per_vdev",
410 		"reference_history",
411 		"reference_tracking_enable",
412 		"send_holes_without_birth_time",
413 		"spa_asize_inflation",
414 		"spa_load_verify_data",
415 		"spa_load_verify_maxinflight",
416 		"spa_load_verify_metadata",
417 		"spa_max_replication_override",
418 		"spa_min_slop",
419 		"spa_mode_global",
420 		"spa_slop_shift",
421 		"space_map_blksz",
422 		"vdev_mirror_shift",
423 		"zfetch_max_distance",
424 		"zfs_abd_chunk_size",
425 		"zfs_abd_scatter_enabled",
426 		"zfs_arc_average_blocksize",
427 		"zfs_arc_evict_batch_limit",
428 		"zfs_arc_grow_retry",
429 		"zfs_arc_max",
430 		"zfs_arc_meta_limit",
431 		"zfs_arc_meta_min",
432 		"zfs_arc_min",
433 		"zfs_arc_p_min_shift",
434 		"zfs_arc_shrink_shift",
435 		"zfs_async_block_max_blocks",
436 		"zfs_ccw_retry_interval",
437 		"zfs_commit_timeout_pct",
438 		"zfs_compressed_arc_enabled",
439 		"zfs_condense_indirect_commit_entry_delay_ticks",
440 		"zfs_condense_indirect_vdevs_enable",
441 		"zfs_condense_max_obsolete_bytes",
442 		"zfs_condense_min_mapping_bytes",
443 		"zfs_condense_pct",
444 		"zfs_dbgmsg_maxsize",
445 		"zfs_deadman_checktime_ms",
446 		"zfs_deadman_enabled",
447 		"zfs_deadman_synctime_ms",
448 		"zfs_dedup_prefetch",
449 		"zfs_default_bs",
450 		"zfs_default_ibs",
451 		"zfs_delay_max_ns",
452 		"zfs_delay_min_dirty_percent",
453 		"zfs_delay_resolution_ns",
454 		"zfs_delay_scale",
455 		"zfs_dirty_data_max",
456 		"zfs_dirty_data_max_max",
457 		"zfs_dirty_data_max_percent",
458 		"zfs_dirty_data_sync",
459 		"zfs_flags",
460 		"zfs_free_bpobj_enabled",
461 		"zfs_free_leak_on_eio",
462 		"zfs_free_min_time_ms",
463 		"zfs_fsync_sync_cnt",
464 		"zfs_immediate_write_sz",
465 		"zfs_indirect_condense_obsolete_pct",
466 		"zfs_lua_check_instrlimit_interval",
467 		"zfs_lua_max_instrlimit",
468 		"zfs_lua_max_memlimit",
469 		"zfs_max_recordsize",
470 		"zfs_mdcomp_disable",
471 		"zfs_metaslab_condense_block_threshold",
472 		"zfs_metaslab_fragmentation_threshold",
473 		"zfs_metaslab_segment_weight_enabled",
474 		"zfs_metaslab_switch_threshold",
475 		"zfs_mg_fragmentation_threshold",
476 		"zfs_mg_noalloc_threshold",
477 		"zfs_multilist_num_sublists",
478 		"zfs_no_scrub_io",
479 		"zfs_no_scrub_prefetch",
480 		"zfs_nocacheflush",
481 		"zfs_nopwrite_enabled",
482 		"zfs_object_remap_one_indirect_delay_ticks",
483 		"zfs_obsolete_min_time_ms",
484 		"zfs_pd_bytes_max",
485 		"zfs_per_txg_dirty_frees_percent",
486 		"zfs_prefetch_disable",
487 		"zfs_read_chunk_size",
488 		"zfs_recover",
489 		"zfs_recv_queue_length",
490 		"zfs_redundant_metadata_most_ditto_level",
491 		"zfs_remap_blkptr_enable",
492 		"zfs_remove_max_copy_bytes",
493 		"zfs_remove_max_segment",
494 		"zfs_resilver_delay",
495 		"zfs_resilver_min_time_ms",
496 		"zfs_scan_idle",
497 		"zfs_scan_min_time_ms",
498 		"zfs_scrub_delay",
499 		"zfs_scrub_limit",
500 		"zfs_send_corrupt_data",
501 		"zfs_send_queue_length",
502 		"zfs_send_set_freerecords_bit",
503 		"zfs_sync_pass_deferred_free",
504 		"zfs_sync_pass_dont_compress",
505 		"zfs_sync_pass_rewrite",
506 		"zfs_sync_taskq_batch_pct",
507 		"zfs_top_maxinflight",
508 		"zfs_txg_timeout",
509 		"zfs_vdev_aggregation_limit",
510 		"zfs_vdev_async_read_max_active",
511 		"zfs_vdev_async_read_min_active",
512 		"zfs_vdev_async_write_active_max_dirty_percent",
513 		"zfs_vdev_async_write_active_min_dirty_percent",
514 		"zfs_vdev_async_write_max_active",
515 		"zfs_vdev_async_write_min_active",
516 		"zfs_vdev_cache_bshift",
517 		"zfs_vdev_cache_max",
518 		"zfs_vdev_cache_size",
519 		"zfs_vdev_max_active",
520 		"zfs_vdev_queue_depth_pct",
521 		"zfs_vdev_read_gap_limit",
522 		"zfs_vdev_removal_max_active",
523 		"zfs_vdev_removal_min_active",
524 		"zfs_vdev_scrub_max_active",
525 		"zfs_vdev_scrub_min_active",
526 		"zfs_vdev_sync_read_max_active",
527 		"zfs_vdev_sync_read_min_active",
528 		"zfs_vdev_sync_write_max_active",
529 		"zfs_vdev_sync_write_min_active",
530 		"zfs_vdev_write_gap_limit",
531 		"zfs_write_implies_delete_child",
532 		"zfs_zil_clean_taskq_maxalloc",
533 		"zfs_zil_clean_taskq_minalloc",
534 		"zfs_zil_clean_taskq_nthr_pct",
535 		"zil_replay_disable",
536 		"zil_slog_bulk",
537 		"zio_buf_debug_limit",
538 		"zio_dva_throttle_enabled",
539 		"zio_injection_enabled",
540 		"zvol_immediate_write_sz",
541 		"zvol_maxphys",
542 		"zvol_unmap_enabled",
543 		"zvol_unmap_sync_enabled",
544 		"zfs_max_dataset_nesting",
545 	};
546 
547 	for (int i = 0; i < sizeof (params) / sizeof (params[0]); i++) {
548 		int sz;
549 		uint64_t val64;
550 		uint32_t *val32p = (uint32_t *)&val64;
551 
552 		sz = mdb_readvar(&val64, params[i]);
553 		if (sz == 4) {
554 			mdb_printf("%s = 0x%x\n", params[i], *val32p);
555 		} else if (sz == 8) {
556 			mdb_printf("%s = 0x%llx\n", params[i], val64);
557 		} else {
558 			mdb_warn("variable %s not found", params[i]);
559 		}
560 	}
561 
562 	return (DCMD_OK);
563 }
564 
565 /* ARGSUSED */
566 static int
567 dva(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
568 {
569 	dva_t dva;
570 	if (mdb_vread(&dva, sizeof (dva_t), addr) == -1) {
571 		mdb_warn("failed to read dva_t");
572 		return (DCMD_ERR);
573 	}
574 	mdb_printf("<%llu:%llx:%llx>\n",
575 	    (u_longlong_t)DVA_GET_VDEV(&dva),
576 	    (u_longlong_t)DVA_GET_OFFSET(&dva),
577 	    (u_longlong_t)DVA_GET_ASIZE(&dva));
578 
579 	return (DCMD_OK);
580 }
581 
582 typedef struct mdb_dmu_object_type_info {
583 	boolean_t ot_encrypt;
584 } mdb_dmu_object_type_info_t;
585 
586 static boolean_t
587 mdb_dmu_ot_is_encrypted_impl(dmu_object_type_t ot)
588 {
589 	mdb_dmu_object_type_info_t mdoti;
590 	GElf_Sym sym;
591 	size_t sz = mdb_ctf_sizeof_by_name("dmu_object_type_info_t");
592 
593 	if (mdb_lookup_by_obj(ZFS_OBJ_NAME, "dmu_ot", &sym)) {
594 		mdb_warn("failed to find " ZFS_OBJ_NAME "`dmu_ot");
595 		return (B_FALSE);
596 	}
597 
598 	if (mdb_ctf_vread(&mdoti, "dmu_object_type_info_t",
599 	    "mdb_dmu_object_type_info_t", sym.st_value + sz * ot, 0) != 0) {
600 		return (B_FALSE);
601 	}
602 
603 	return (mdoti.ot_encrypt);
604 }
605 
606 /* ARGSUSED */
607 static int
608 blkptr(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
609 {
610 	char type[80], checksum[80], compress[80];
611 	blkptr_t blk, *bp = &blk;
612 	char buf[BP_SPRINTF_LEN];
613 
614 	if (mdb_vread(&blk, sizeof (blkptr_t), addr) == -1) {
615 		mdb_warn("failed to read blkptr_t");
616 		return (DCMD_ERR);
617 	}
618 
619 	if (enum_lookup("enum dmu_object_type", BP_GET_TYPE(bp), "DMU_OT_",
620 	    sizeof (type), type) == -1 ||
621 	    enum_lookup("enum zio_checksum", BP_GET_CHECKSUM(bp),
622 	    "ZIO_CHECKSUM_", sizeof (checksum), checksum) == -1 ||
623 	    enum_lookup("enum zio_compress", BP_GET_COMPRESS(bp),
624 	    "ZIO_COMPRESS_", sizeof (compress), compress) == -1) {
625 		mdb_warn("Could not find blkptr enumerated types");
626 		return (DCMD_ERR);
627 	}
628 
629 	SNPRINTF_BLKPTR(mdb_snprintf, '\n', buf, sizeof (buf), bp, type,
630 	    checksum, compress);
631 
632 	mdb_printf("%s\n", buf);
633 
634 	return (DCMD_OK);
635 }
636 
637 typedef struct mdb_dmu_buf_impl {
638 	struct {
639 		uint64_t db_object;
640 		uintptr_t db_data;
641 	} db;
642 	uintptr_t db_objset;
643 	uint64_t db_level;
644 	uint64_t db_blkid;
645 	struct {
646 		uint64_t rc_count;
647 	} db_holds;
648 } mdb_dmu_buf_impl_t;
649 
650 /* ARGSUSED */
651 static int
652 dbuf(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
653 {
654 	mdb_dmu_buf_impl_t db;
655 	char objectname[32];
656 	char blkidname[32];
657 	char path[ZFS_MAX_DATASET_NAME_LEN];
658 	int ptr_width = (int)(sizeof (void *)) * 2;
659 
660 	if (DCMD_HDRSPEC(flags))
661 		mdb_printf("%*s %8s %3s %9s %5s %s\n",
662 		    ptr_width, "addr", "object", "lvl", "blkid", "holds", "os");
663 
664 	if (mdb_ctf_vread(&db, ZFS_STRUCT "dmu_buf_impl", "mdb_dmu_buf_impl_t",
665 	    addr, 0) == -1)
666 		return (DCMD_ERR);
667 
668 	if (db.db.db_object == DMU_META_DNODE_OBJECT)
669 		(void) strcpy(objectname, "mdn");
670 	else
671 		(void) mdb_snprintf(objectname, sizeof (objectname), "%llx",
672 		    (u_longlong_t)db.db.db_object);
673 
674 	if (db.db_blkid == DMU_BONUS_BLKID)
675 		(void) strcpy(blkidname, "bonus");
676 	else
677 		(void) mdb_snprintf(blkidname, sizeof (blkidname), "%llx",
678 		    (u_longlong_t)db.db_blkid);
679 
680 	if (objset_name(db.db_objset, path)) {
681 		return (DCMD_ERR);
682 	}
683 
684 	mdb_printf("%*p %8s %3u %9s %5llu %s\n", ptr_width, addr,
685 	    objectname, (int)db.db_level, blkidname,
686 	    db.db_holds.rc_count, path);
687 
688 	return (DCMD_OK);
689 }
690 
691 /* ARGSUSED */
692 static int
693 dbuf_stats(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
694 {
695 #define	HISTOSZ 32
696 	uintptr_t dbp;
697 	dmu_buf_impl_t db;
698 	dbuf_hash_table_t ht;
699 	uint64_t bucket, ndbufs;
700 	uint64_t histo[HISTOSZ];
701 	uint64_t histo2[HISTOSZ];
702 	int i, maxidx;
703 
704 	if (mdb_readvar(&ht, "dbuf_hash_table") == -1) {
705 		mdb_warn("failed to read 'dbuf_hash_table'");
706 		return (DCMD_ERR);
707 	}
708 
709 	for (i = 0; i < HISTOSZ; i++) {
710 		histo[i] = 0;
711 		histo2[i] = 0;
712 	}
713 
714 	ndbufs = 0;
715 	for (bucket = 0; bucket < ht.hash_table_mask+1; bucket++) {
716 		int len;
717 
718 		if (mdb_vread(&dbp, sizeof (void *),
719 		    (uintptr_t)(ht.hash_table+bucket)) == -1) {
720 			mdb_warn("failed to read hash bucket %u at %p",
721 			    bucket, ht.hash_table+bucket);
722 			return (DCMD_ERR);
723 		}
724 
725 		len = 0;
726 		while (dbp != 0) {
727 			if (mdb_vread(&db, sizeof (dmu_buf_impl_t),
728 			    dbp) == -1) {
729 				mdb_warn("failed to read dbuf at %p", dbp);
730 				return (DCMD_ERR);
731 			}
732 			dbp = (uintptr_t)db.db_hash_next;
733 			for (i = MIN(len, HISTOSZ - 1); i >= 0; i--)
734 				histo2[i]++;
735 			len++;
736 			ndbufs++;
737 		}
738 
739 		if (len >= HISTOSZ)
740 			len = HISTOSZ-1;
741 		histo[len]++;
742 	}
743 
744 	mdb_printf("hash table has %llu buckets, %llu dbufs "
745 	    "(avg %llu buckets/dbuf)\n",
746 	    ht.hash_table_mask+1, ndbufs,
747 	    (ht.hash_table_mask+1)/ndbufs);
748 
749 	mdb_printf("\n");
750 	maxidx = 0;
751 	for (i = 0; i < HISTOSZ; i++)
752 		if (histo[i] > 0)
753 			maxidx = i;
754 	mdb_printf("hash chain length	number of buckets\n");
755 	for (i = 0; i <= maxidx; i++)
756 		mdb_printf("%u			%llu\n", i, histo[i]);
757 
758 	mdb_printf("\n");
759 	maxidx = 0;
760 	for (i = 0; i < HISTOSZ; i++)
761 		if (histo2[i] > 0)
762 			maxidx = i;
763 	mdb_printf("hash chain depth	number of dbufs\n");
764 	for (i = 0; i <= maxidx; i++)
765 		mdb_printf("%u or more		%llu	%llu%%\n",
766 		    i, histo2[i], histo2[i]*100/ndbufs);
767 
768 
769 	return (DCMD_OK);
770 }
771 
772 #define	CHAIN_END 0xffff
773 /*
774  * ::zap_leaf [-v]
775  *
776  * Print a zap_leaf_phys_t, assumed to be 16k
777  */
778 /* ARGSUSED */
779 static int
780 zap_leaf(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
781 {
782 	char buf[16*1024];
783 	int verbose = B_FALSE;
784 	int four = B_FALSE;
785 	dmu_buf_t l_dbuf;
786 	zap_leaf_t l;
787 	zap_leaf_phys_t *zlp = (void *)buf;
788 	int i;
789 
790 	if (mdb_getopts(argc, argv,
791 	    'v', MDB_OPT_SETBITS, TRUE, &verbose,
792 	    '4', MDB_OPT_SETBITS, TRUE, &four,
793 	    NULL) != argc)
794 		return (DCMD_USAGE);
795 
796 	l_dbuf.db_data = zlp;
797 	l.l_dbuf = &l_dbuf;
798 	l.l_bs = 14; /* assume 16k blocks */
799 	if (four)
800 		l.l_bs = 12;
801 
802 	if (!(flags & DCMD_ADDRSPEC)) {
803 		return (DCMD_USAGE);
804 	}
805 
806 	if (mdb_vread(buf, sizeof (buf), addr) == -1) {
807 		mdb_warn("failed to read zap_leaf_phys_t at %p", addr);
808 		return (DCMD_ERR);
809 	}
810 
811 	if (zlp->l_hdr.lh_block_type != ZBT_LEAF ||
812 	    zlp->l_hdr.lh_magic != ZAP_LEAF_MAGIC) {
813 		mdb_warn("This does not appear to be a zap_leaf_phys_t");
814 		return (DCMD_ERR);
815 	}
816 
817 	mdb_printf("zap_leaf_phys_t at %p:\n", addr);
818 	mdb_printf("    lh_prefix_len = %u\n", zlp->l_hdr.lh_prefix_len);
819 	mdb_printf("    lh_prefix = %llx\n", zlp->l_hdr.lh_prefix);
820 	mdb_printf("    lh_nentries = %u\n", zlp->l_hdr.lh_nentries);
821 	mdb_printf("    lh_nfree = %u\n", zlp->l_hdr.lh_nfree,
822 	    zlp->l_hdr.lh_nfree * 100 / (ZAP_LEAF_NUMCHUNKS(&l)));
823 	mdb_printf("    lh_freelist = %u\n", zlp->l_hdr.lh_freelist);
824 	mdb_printf("    lh_flags = %x (%s)\n", zlp->l_hdr.lh_flags,
825 	    zlp->l_hdr.lh_flags & ZLF_ENTRIES_CDSORTED ?
826 	    "ENTRIES_CDSORTED" : "");
827 
828 	if (verbose) {
829 		mdb_printf(" hash table:\n");
830 		for (i = 0; i < ZAP_LEAF_HASH_NUMENTRIES(&l); i++) {
831 			if (zlp->l_hash[i] != CHAIN_END)
832 				mdb_printf("    %u: %u\n", i, zlp->l_hash[i]);
833 		}
834 	}
835 
836 	mdb_printf(" chunks:\n");
837 	for (i = 0; i < ZAP_LEAF_NUMCHUNKS(&l); i++) {
838 		/* LINTED: alignment */
839 		zap_leaf_chunk_t *zlc = &ZAP_LEAF_CHUNK(&l, i);
840 		switch (zlc->l_entry.le_type) {
841 		case ZAP_CHUNK_FREE:
842 			if (verbose) {
843 				mdb_printf("    %u: free; lf_next = %u\n",
844 				    i, zlc->l_free.lf_next);
845 			}
846 			break;
847 		case ZAP_CHUNK_ENTRY:
848 			mdb_printf("    %u: entry\n", i);
849 			if (verbose) {
850 				mdb_printf("        le_next = %u\n",
851 				    zlc->l_entry.le_next);
852 			}
853 			mdb_printf("        le_name_chunk = %u\n",
854 			    zlc->l_entry.le_name_chunk);
855 			mdb_printf("        le_name_numints = %u\n",
856 			    zlc->l_entry.le_name_numints);
857 			mdb_printf("        le_value_chunk = %u\n",
858 			    zlc->l_entry.le_value_chunk);
859 			mdb_printf("        le_value_intlen = %u\n",
860 			    zlc->l_entry.le_value_intlen);
861 			mdb_printf("        le_value_numints = %u\n",
862 			    zlc->l_entry.le_value_numints);
863 			mdb_printf("        le_cd = %u\n",
864 			    zlc->l_entry.le_cd);
865 			mdb_printf("        le_hash = %llx\n",
866 			    zlc->l_entry.le_hash);
867 			break;
868 		case ZAP_CHUNK_ARRAY:
869 			mdb_printf("    %u: array", i);
870 			if (strisprint((char *)zlc->l_array.la_array))
871 				mdb_printf(" \"%s\"", zlc->l_array.la_array);
872 			mdb_printf("\n");
873 			if (verbose) {
874 				int j;
875 				mdb_printf("        ");
876 				for (j = 0; j < ZAP_LEAF_ARRAY_BYTES; j++) {
877 					mdb_printf("%02x ",
878 					    zlc->l_array.la_array[j]);
879 				}
880 				mdb_printf("\n");
881 			}
882 			if (zlc->l_array.la_next != CHAIN_END) {
883 				mdb_printf("        lf_next = %u\n",
884 				    zlc->l_array.la_next);
885 			}
886 			break;
887 		default:
888 			mdb_printf("    %u: undefined type %u\n",
889 			    zlc->l_entry.le_type);
890 		}
891 	}
892 
893 	return (DCMD_OK);
894 }
895 
896 typedef struct dbufs_data {
897 	mdb_ctf_id_t id;
898 	uint64_t objset;
899 	uint64_t object;
900 	uint64_t level;
901 	uint64_t blkid;
902 	char *osname;
903 } dbufs_data_t;
904 
905 #define	DBUFS_UNSET	(0xbaddcafedeadbeefULL)
906 
907 /* ARGSUSED */
908 static int
909 dbufs_cb(uintptr_t addr, const void *unknown, void *arg)
910 {
911 	dbufs_data_t *data = arg;
912 	uintptr_t objset;
913 	dmu_buf_t db;
914 	uint8_t level;
915 	uint64_t blkid;
916 	char osname[ZFS_MAX_DATASET_NAME_LEN];
917 
918 	if (GETMEMBID(addr, &data->id, db_objset, objset) ||
919 	    GETMEMBID(addr, &data->id, db, db) ||
920 	    GETMEMBID(addr, &data->id, db_level, level) ||
921 	    GETMEMBID(addr, &data->id, db_blkid, blkid)) {
922 		return (WALK_ERR);
923 	}
924 
925 	if ((data->objset == DBUFS_UNSET || data->objset == objset) &&
926 	    (data->osname == NULL || (objset_name(objset, osname) == 0 &&
927 	    strcmp(data->osname, osname) == 0)) &&
928 	    (data->object == DBUFS_UNSET || data->object == db.db_object) &&
929 	    (data->level == DBUFS_UNSET || data->level == level) &&
930 	    (data->blkid == DBUFS_UNSET || data->blkid == blkid)) {
931 		mdb_printf("%#lr\n", addr);
932 	}
933 	return (WALK_NEXT);
934 }
935 
936 /* ARGSUSED */
937 static int
938 dbufs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
939 {
940 	dbufs_data_t data;
941 	char *object = NULL;
942 	char *blkid = NULL;
943 
944 	data.objset = data.object = data.level = data.blkid = DBUFS_UNSET;
945 	data.osname = NULL;
946 
947 	if (mdb_getopts(argc, argv,
948 	    'O', MDB_OPT_UINT64, &data.objset,
949 	    'n', MDB_OPT_STR, &data.osname,
950 	    'o', MDB_OPT_STR, &object,
951 	    'l', MDB_OPT_UINT64, &data.level,
952 	    'b', MDB_OPT_STR, &blkid,
953 	    NULL) != argc) {
954 		return (DCMD_USAGE);
955 	}
956 
957 	if (object) {
958 		if (strcmp(object, "mdn") == 0) {
959 			data.object = DMU_META_DNODE_OBJECT;
960 		} else {
961 			data.object = mdb_strtoull(object);
962 		}
963 	}
964 
965 	if (blkid) {
966 		if (strcmp(blkid, "bonus") == 0) {
967 			data.blkid = DMU_BONUS_BLKID;
968 		} else {
969 			data.blkid = mdb_strtoull(blkid);
970 		}
971 	}
972 
973 	if (mdb_ctf_lookup_by_name(ZFS_STRUCT "dmu_buf_impl", &data.id) == -1) {
974 		mdb_warn("couldn't find struct dmu_buf_impl_t");
975 		return (DCMD_ERR);
976 	}
977 
978 	if (mdb_walk("dmu_buf_impl_t", dbufs_cb, &data) != 0) {
979 		mdb_warn("can't walk dbufs");
980 		return (DCMD_ERR);
981 	}
982 
983 	return (DCMD_OK);
984 }
985 
986 typedef struct abuf_find_data {
987 	dva_t dva;
988 	mdb_ctf_id_t id;
989 } abuf_find_data_t;
990 
991 /* ARGSUSED */
992 static int
993 abuf_find_cb(uintptr_t addr, const void *unknown, void *arg)
994 {
995 	abuf_find_data_t *data = arg;
996 	dva_t dva;
997 
998 	if (GETMEMBID(addr, &data->id, b_dva, dva)) {
999 		return (WALK_ERR);
1000 	}
1001 
1002 	if (dva.dva_word[0] == data->dva.dva_word[0] &&
1003 	    dva.dva_word[1] == data->dva.dva_word[1]) {
1004 		mdb_printf("%#lr\n", addr);
1005 	}
1006 	return (WALK_NEXT);
1007 }
1008 
1009 /* ARGSUSED */
1010 static int
1011 abuf_find(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1012 {
1013 	abuf_find_data_t data;
1014 	GElf_Sym sym;
1015 	int i;
1016 	const char *syms[] = {
1017 		"ARC_mru",
1018 		"ARC_mru_ghost",
1019 		"ARC_mfu",
1020 		"ARC_mfu_ghost",
1021 	};
1022 
1023 	if (argc != 2)
1024 		return (DCMD_USAGE);
1025 
1026 	for (i = 0; i < 2; i ++) {
1027 		switch (argv[i].a_type) {
1028 		case MDB_TYPE_STRING:
1029 			data.dva.dva_word[i] = mdb_strtoull(argv[i].a_un.a_str);
1030 			break;
1031 		case MDB_TYPE_IMMEDIATE:
1032 			data.dva.dva_word[i] = argv[i].a_un.a_val;
1033 			break;
1034 		default:
1035 			return (DCMD_USAGE);
1036 		}
1037 	}
1038 
1039 	if (mdb_ctf_lookup_by_name(ZFS_STRUCT "arc_buf_hdr", &data.id) == -1) {
1040 		mdb_warn("couldn't find struct arc_buf_hdr");
1041 		return (DCMD_ERR);
1042 	}
1043 
1044 	for (i = 0; i < sizeof (syms) / sizeof (syms[0]); i++) {
1045 		if (mdb_lookup_by_obj(ZFS_OBJ_NAME, syms[i], &sym)) {
1046 			mdb_warn("can't find symbol %s", syms[i]);
1047 			return (DCMD_ERR);
1048 		}
1049 
1050 		if (mdb_pwalk("list", abuf_find_cb, &data, sym.st_value) != 0) {
1051 			mdb_warn("can't walk %s", syms[i]);
1052 			return (DCMD_ERR);
1053 		}
1054 	}
1055 
1056 	return (DCMD_OK);
1057 }
1058 
1059 
1060 typedef struct dbgmsg_arg {
1061 	boolean_t da_verbose;
1062 	boolean_t da_address;
1063 } dbgmsg_arg_t;
1064 
1065 /* ARGSUSED */
1066 static int
1067 dbgmsg_cb(uintptr_t addr, const void *unknown, void *arg)
1068 {
1069 	static mdb_ctf_id_t id;
1070 	static boolean_t gotid;
1071 	static ulong_t off;
1072 
1073 	dbgmsg_arg_t *da = arg;
1074 	time_t timestamp;
1075 	char buf[1024];
1076 
1077 	if (!gotid) {
1078 		if (mdb_ctf_lookup_by_name(ZFS_STRUCT "zfs_dbgmsg", &id) ==
1079 		    -1) {
1080 			mdb_warn("couldn't find struct zfs_dbgmsg");
1081 			return (WALK_ERR);
1082 		}
1083 		gotid = TRUE;
1084 		if (mdb_ctf_offsetof(id, "zdm_msg", &off) == -1) {
1085 			mdb_warn("couldn't find zdm_msg");
1086 			return (WALK_ERR);
1087 		}
1088 		off /= 8;
1089 	}
1090 
1091 
1092 	if (GETMEMBID(addr, &id, zdm_timestamp, timestamp)) {
1093 		return (WALK_ERR);
1094 	}
1095 
1096 	if (mdb_readstr(buf, sizeof (buf), addr + off) == -1) {
1097 		mdb_warn("failed to read zdm_msg at %p\n", addr + off);
1098 		return (DCMD_ERR);
1099 	}
1100 
1101 	if (da->da_address)
1102 		mdb_printf("%p ", addr);
1103 	if (da->da_verbose)
1104 		mdb_printf("%Y ", timestamp);
1105 
1106 	mdb_printf("%s\n", buf);
1107 
1108 	if (da->da_verbose)
1109 		(void) mdb_call_dcmd("whatis", addr, DCMD_ADDRSPEC, 0, NULL);
1110 
1111 	return (WALK_NEXT);
1112 }
1113 
1114 /* ARGSUSED */
1115 static int
1116 dbgmsg(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1117 {
1118 	GElf_Sym sym;
1119 	dbgmsg_arg_t da = { 0 };
1120 
1121 	if (mdb_getopts(argc, argv,
1122 	    'v', MDB_OPT_SETBITS, B_TRUE, &da.da_verbose,
1123 	    'a', MDB_OPT_SETBITS, B_TRUE, &da.da_address,
1124 	    NULL) != argc)
1125 		return (DCMD_USAGE);
1126 
1127 	if (mdb_lookup_by_obj(ZFS_OBJ_NAME, "zfs_dbgmsgs", &sym)) {
1128 		mdb_warn("can't find zfs_dbgmsgs");
1129 		return (DCMD_ERR);
1130 	}
1131 
1132 	if (mdb_pwalk("list", dbgmsg_cb, &da, sym.st_value) != 0) {
1133 		mdb_warn("can't walk zfs_dbgmsgs");
1134 		return (DCMD_ERR);
1135 	}
1136 
1137 	return (DCMD_OK);
1138 }
1139 
1140 /*ARGSUSED*/
1141 static int
1142 arc_print(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1143 {
1144 	kstat_named_t *stats;
1145 	GElf_Sym sym;
1146 	int nstats, i;
1147 	uint_t opt_a = FALSE;
1148 	uint_t opt_b = FALSE;
1149 	uint_t shift = 0;
1150 	const char *suffix;
1151 
1152 	static const char *bytestats[] = {
1153 		"p", "c", "c_min", "c_max", "size", "duplicate_buffers_size",
1154 		"arc_meta_used", "arc_meta_limit", "arc_meta_max",
1155 		"arc_meta_min", "hdr_size", "data_size", "metadata_size",
1156 		"other_size", "anon_size", "anon_evictable_data",
1157 		"anon_evictable_metadata", "mru_size", "mru_evictable_data",
1158 		"mru_evictable_metadata", "mru_ghost_size",
1159 		"mru_ghost_evictable_data", "mru_ghost_evictable_metadata",
1160 		"mfu_size", "mfu_evictable_data", "mfu_evictable_metadata",
1161 		"mfu_ghost_size", "mfu_ghost_evictable_data",
1162 		"mfu_ghost_evictable_metadata", "evict_l2_cached",
1163 		"evict_l2_eligible", "evict_l2_ineligible", "l2_read_bytes",
1164 		"l2_write_bytes", "l2_size", "l2_asize", "l2_hdr_size",
1165 		"compressed_size", "uncompressed_size", "overhead_size",
1166 		NULL
1167 	};
1168 
1169 	static const char *extras[] = {
1170 		"arc_no_grow", "arc_tempreserve",
1171 		NULL
1172 	};
1173 
1174 	if (mdb_lookup_by_obj(ZFS_OBJ_NAME, "arc_stats", &sym) == -1) {
1175 		mdb_warn("failed to find 'arc_stats'");
1176 		return (DCMD_ERR);
1177 	}
1178 
1179 	stats = mdb_zalloc(sym.st_size, UM_SLEEP | UM_GC);
1180 
1181 	if (mdb_vread(stats, sym.st_size, sym.st_value) == -1) {
1182 		mdb_warn("couldn't read 'arc_stats' at %p", sym.st_value);
1183 		return (DCMD_ERR);
1184 	}
1185 
1186 	nstats = sym.st_size / sizeof (kstat_named_t);
1187 
1188 	/* NB: -a / opt_a are ignored for backwards compatability */
1189 	if (mdb_getopts(argc, argv,
1190 	    'a', MDB_OPT_SETBITS, TRUE, &opt_a,
1191 	    'b', MDB_OPT_SETBITS, TRUE, &opt_b,
1192 	    'k', MDB_OPT_SETBITS, 10, &shift,
1193 	    'm', MDB_OPT_SETBITS, 20, &shift,
1194 	    'g', MDB_OPT_SETBITS, 30, &shift,
1195 	    NULL) != argc)
1196 		return (DCMD_USAGE);
1197 
1198 	if (!opt_b && !shift)
1199 		shift = 20;
1200 
1201 	switch (shift) {
1202 	case 0:
1203 		suffix = "B";
1204 		break;
1205 	case 10:
1206 		suffix = "KB";
1207 		break;
1208 	case 20:
1209 		suffix = "MB";
1210 		break;
1211 	case 30:
1212 		suffix = "GB";
1213 		break;
1214 	default:
1215 		suffix = "XX";
1216 	}
1217 
1218 	for (i = 0; i < nstats; i++) {
1219 		int j;
1220 		boolean_t bytes = B_FALSE;
1221 
1222 		for (j = 0; bytestats[j]; j++) {
1223 			if (strcmp(stats[i].name, bytestats[j]) == 0) {
1224 				bytes = B_TRUE;
1225 				break;
1226 			}
1227 		}
1228 
1229 		if (bytes) {
1230 			mdb_printf("%-25s = %9llu %s\n", stats[i].name,
1231 			    stats[i].value.ui64 >> shift, suffix);
1232 		} else {
1233 			mdb_printf("%-25s = %9llu\n", stats[i].name,
1234 			    stats[i].value.ui64);
1235 		}
1236 	}
1237 
1238 	for (i = 0; extras[i]; i++) {
1239 		uint64_t buf;
1240 
1241 		if (mdb_lookup_by_obj(ZFS_OBJ_NAME, extras[i], &sym) == -1) {
1242 			mdb_warn("failed to find '%s'", extras[i]);
1243 			return (DCMD_ERR);
1244 		}
1245 
1246 		if (sym.st_size != sizeof (uint64_t) &&
1247 		    sym.st_size != sizeof (uint32_t)) {
1248 			mdb_warn("expected scalar for variable '%s'\n",
1249 			    extras[i]);
1250 			return (DCMD_ERR);
1251 		}
1252 
1253 		if (mdb_vread(&buf, sym.st_size, sym.st_value) == -1) {
1254 			mdb_warn("couldn't read '%s'", extras[i]);
1255 			return (DCMD_ERR);
1256 		}
1257 
1258 		mdb_printf("%-25s = ", extras[i]);
1259 
1260 		/* NB: all the 64-bit extras happen to be byte counts */
1261 		if (sym.st_size == sizeof (uint64_t))
1262 			mdb_printf("%9llu %s\n", buf >> shift, suffix);
1263 
1264 		if (sym.st_size == sizeof (uint32_t))
1265 			mdb_printf("%9d\n", *((uint32_t *)&buf));
1266 	}
1267 	return (DCMD_OK);
1268 }
1269 
1270 typedef struct mdb_spa_print {
1271 	pool_state_t spa_state;
1272 	char spa_name[ZFS_MAX_DATASET_NAME_LEN];
1273 	uintptr_t spa_normal_class;
1274 } mdb_spa_print_t;
1275 
1276 
1277 const char histo_stars[] = "****************************************";
1278 const int histo_width = sizeof (histo_stars) - 1;
1279 
1280 static void
1281 dump_histogram(const uint64_t *histo, int size, int offset)
1282 {
1283 	int i;
1284 	int minidx = size - 1;
1285 	int maxidx = 0;
1286 	uint64_t max = 0;
1287 
1288 	for (i = 0; i < size; i++) {
1289 		if (histo[i] > max)
1290 			max = histo[i];
1291 		if (histo[i] > 0 && i > maxidx)
1292 			maxidx = i;
1293 		if (histo[i] > 0 && i < minidx)
1294 			minidx = i;
1295 	}
1296 
1297 	if (max < histo_width)
1298 		max = histo_width;
1299 
1300 	for (i = minidx; i <= maxidx; i++) {
1301 		mdb_printf("%3u: %6llu %s\n",
1302 		    i + offset, (u_longlong_t)histo[i],
1303 		    &histo_stars[(max - histo[i]) * histo_width / max]);
1304 	}
1305 }
1306 
1307 typedef struct mdb_metaslab_class {
1308 	uint64_t mc_histogram[RANGE_TREE_HISTOGRAM_SIZE];
1309 } mdb_metaslab_class_t;
1310 
1311 /*
1312  * spa_class_histogram(uintptr_t class_addr)
1313  *
1314  * Prints free space histogram for a device class
1315  *
1316  * Returns DCMD_OK, or DCMD_ERR.
1317  */
1318 static int
1319 spa_class_histogram(uintptr_t class_addr)
1320 {
1321 	mdb_metaslab_class_t mc;
1322 	if (mdb_ctf_vread(&mc, "metaslab_class_t",
1323 	    "mdb_metaslab_class_t", class_addr, 0) == -1)
1324 		return (DCMD_ERR);
1325 
1326 	mdb_inc_indent(4);
1327 	dump_histogram(mc.mc_histogram, RANGE_TREE_HISTOGRAM_SIZE, 0);
1328 	mdb_dec_indent(4);
1329 	return (DCMD_OK);
1330 }
1331 
1332 /*
1333  * ::spa
1334  *
1335  *	-c	Print configuration information as well
1336  *	-v	Print vdev state
1337  *	-e	Print vdev error stats
1338  *	-m	Print vdev metaslab info
1339  *	-M	print vdev metaslab group info
1340  *	-h	Print histogram info (must be combined with -m or -M)
1341  *
1342  * Print a summarized spa_t.  When given no arguments, prints out a table of all
1343  * active pools on the system.
1344  */
1345 /* ARGSUSED */
1346 static int
1347 spa_print(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1348 {
1349 	const char *statetab[] = { "ACTIVE", "EXPORTED", "DESTROYED",
1350 		"SPARE", "L2CACHE", "UNINIT", "UNAVAIL", "POTENTIAL" };
1351 	const char *state;
1352 	int spa_flags = 0;
1353 
1354 	if (mdb_getopts(argc, argv,
1355 	    'c', MDB_OPT_SETBITS, SPA_FLAG_CONFIG, &spa_flags,
1356 	    'v', MDB_OPT_SETBITS, SPA_FLAG_VDEVS, &spa_flags,
1357 	    'e', MDB_OPT_SETBITS, SPA_FLAG_ERRORS, &spa_flags,
1358 	    'M', MDB_OPT_SETBITS, SPA_FLAG_METASLAB_GROUPS, &spa_flags,
1359 	    'm', MDB_OPT_SETBITS, SPA_FLAG_METASLABS, &spa_flags,
1360 	    'h', MDB_OPT_SETBITS, SPA_FLAG_HISTOGRAMS, &spa_flags,
1361 	    NULL) != argc)
1362 		return (DCMD_USAGE);
1363 
1364 	if (!(flags & DCMD_ADDRSPEC)) {
1365 		if (mdb_walk_dcmd("spa", "spa", argc, argv) == -1) {
1366 			mdb_warn("can't walk spa");
1367 			return (DCMD_ERR);
1368 		}
1369 
1370 		return (DCMD_OK);
1371 	}
1372 
1373 	if (flags & DCMD_PIPE_OUT) {
1374 		mdb_printf("%#lr\n", addr);
1375 		return (DCMD_OK);
1376 	}
1377 
1378 	if (DCMD_HDRSPEC(flags))
1379 		mdb_printf("%<u>%-?s %9s %-*s%</u>\n", "ADDR", "STATE",
1380 		    sizeof (uintptr_t) == 4 ? 60 : 52, "NAME");
1381 
1382 	mdb_spa_print_t spa;
1383 	if (mdb_ctf_vread(&spa, "spa_t", "mdb_spa_print_t", addr, 0) == -1)
1384 		return (DCMD_ERR);
1385 
1386 	if (spa.spa_state < 0 || spa.spa_state > POOL_STATE_UNAVAIL)
1387 		state = "UNKNOWN";
1388 	else
1389 		state = statetab[spa.spa_state];
1390 
1391 	mdb_printf("%0?p %9s %s\n", addr, state, spa.spa_name);
1392 	if (spa_flags & SPA_FLAG_HISTOGRAMS)
1393 		spa_class_histogram(spa.spa_normal_class);
1394 
1395 	if (spa_flags & SPA_FLAG_CONFIG) {
1396 		mdb_printf("\n");
1397 		mdb_inc_indent(4);
1398 		if (mdb_call_dcmd("spa_config", addr, flags, 0,
1399 		    NULL) != DCMD_OK)
1400 			return (DCMD_ERR);
1401 		mdb_dec_indent(4);
1402 	}
1403 
1404 	if (spa_flags & SPA_FLAG_ALL_VDEV) {
1405 		mdb_arg_t v;
1406 		char opts[100] = "-";
1407 		int args =
1408 		    (spa_flags | SPA_FLAG_VDEVS) == SPA_FLAG_VDEVS ? 0 : 1;
1409 
1410 		if (spa_flags & SPA_FLAG_ERRORS)
1411 			strcat(opts, "e");
1412 		if (spa_flags & SPA_FLAG_METASLABS)
1413 			strcat(opts, "m");
1414 		if (spa_flags & SPA_FLAG_METASLAB_GROUPS)
1415 			strcat(opts, "M");
1416 		if (spa_flags & SPA_FLAG_HISTOGRAMS)
1417 			strcat(opts, "h");
1418 
1419 		v.a_type = MDB_TYPE_STRING;
1420 		v.a_un.a_str = opts;
1421 
1422 		mdb_printf("\n");
1423 		mdb_inc_indent(4);
1424 		if (mdb_call_dcmd("spa_vdevs", addr, flags, args,
1425 		    &v) != DCMD_OK)
1426 			return (DCMD_ERR);
1427 		mdb_dec_indent(4);
1428 	}
1429 
1430 	return (DCMD_OK);
1431 }
1432 
1433 typedef struct mdb_spa_config_spa {
1434 	uintptr_t spa_config;
1435 } mdb_spa_config_spa_t;
1436 
1437 /*
1438  * ::spa_config
1439  *
1440  * Given a spa_t, print the configuration information stored in spa_config.
1441  * Since it's just an nvlist, format it as an indented list of name=value pairs.
1442  * We simply read the value of spa_config and pass off to ::nvlist.
1443  */
1444 /* ARGSUSED */
1445 static int
1446 spa_print_config(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1447 {
1448 	mdb_spa_config_spa_t spa;
1449 
1450 	if (argc != 0 || !(flags & DCMD_ADDRSPEC))
1451 		return (DCMD_USAGE);
1452 
1453 	if (mdb_ctf_vread(&spa, ZFS_STRUCT "spa", "mdb_spa_config_spa_t",
1454 	    addr, 0) == -1)
1455 		return (DCMD_ERR);
1456 
1457 	if (spa.spa_config == 0) {
1458 		mdb_printf("(none)\n");
1459 		return (DCMD_OK);
1460 	}
1461 
1462 	return (mdb_call_dcmd("nvlist", spa.spa_config, flags,
1463 	    0, NULL));
1464 }
1465 
1466 typedef struct mdb_range_tree {
1467 	struct {
1468 		uint64_t bt_num_elems;
1469 		uint64_t bt_num_nodes;
1470 	} rt_root;
1471 	uint64_t rt_space;
1472 	range_seg_type_t rt_type;
1473 	uint8_t		rt_shift;
1474 	uint64_t	rt_start;
1475 } mdb_range_tree_t;
1476 
1477 typedef struct mdb_metaslab_group {
1478 	uint64_t mg_fragmentation;
1479 	uint64_t mg_histogram[RANGE_TREE_HISTOGRAM_SIZE];
1480 	uintptr_t mg_vd;
1481 } mdb_metaslab_group_t;
1482 
1483 typedef struct mdb_metaslab {
1484 	uint64_t ms_id;
1485 	uint64_t ms_start;
1486 	uint64_t ms_size;
1487 	int64_t ms_deferspace;
1488 	uint64_t ms_fragmentation;
1489 	uint64_t ms_weight;
1490 	uintptr_t ms_allocating[TXG_SIZE];
1491 	uintptr_t ms_checkpointing;
1492 	uintptr_t ms_freeing;
1493 	uintptr_t ms_freed;
1494 	uintptr_t ms_allocatable;
1495 	uintptr_t ms_unflushed_frees;
1496 	uintptr_t ms_unflushed_allocs;
1497 	uintptr_t ms_sm;
1498 } mdb_metaslab_t;
1499 
1500 typedef struct mdb_space_map_phys_t {
1501 	int64_t smp_alloc;
1502 	uint64_t smp_histogram[SPACE_MAP_HISTOGRAM_SIZE];
1503 } mdb_space_map_phys_t;
1504 
1505 typedef struct mdb_space_map {
1506 	uint64_t sm_size;
1507 	uint8_t sm_shift;
1508 	uintptr_t sm_phys;
1509 } mdb_space_map_t;
1510 
1511 typedef struct mdb_vdev {
1512 	uint64_t vdev_id;
1513 	uint64_t vdev_state;
1514 	uintptr_t vdev_ops;
1515 	struct {
1516 		uint64_t vs_aux;
1517 		uint64_t vs_ops[VS_ZIO_TYPES];
1518 		uint64_t vs_bytes[VS_ZIO_TYPES];
1519 		uint64_t vs_read_errors;
1520 		uint64_t vs_write_errors;
1521 		uint64_t vs_checksum_errors;
1522 	} vdev_stat;
1523 	uintptr_t vdev_child;
1524 	uint64_t vdev_children;
1525 	uint64_t vdev_ms_count;
1526 	uintptr_t vdev_mg;
1527 	uintptr_t vdev_ms;
1528 	uintptr_t vdev_path;
1529 } mdb_vdev_t;
1530 
1531 typedef struct mdb_vdev_ops {
1532 	char vdev_op_type[16];
1533 } mdb_vdev_ops_t;
1534 
1535 static int
1536 metaslab_stats(mdb_vdev_t *vd, int spa_flags)
1537 {
1538 	mdb_inc_indent(4);
1539 	mdb_printf("%<u>%-?s %6s %20s %10s %10s %10s%</u>\n", "ADDR", "ID",
1540 	    "OFFSET", "FREE", "FRAG", "UCMU");
1541 
1542 	uintptr_t *vdev_ms = mdb_alloc(vd->vdev_ms_count * sizeof (vdev_ms),
1543 	    UM_SLEEP | UM_GC);
1544 	if (mdb_vread(vdev_ms, vd->vdev_ms_count * sizeof (uintptr_t),
1545 	    vd->vdev_ms) == -1) {
1546 		mdb_warn("failed to read vdev_ms at %p\n", vd->vdev_ms);
1547 		return (DCMD_ERR);
1548 	}
1549 
1550 	for (int m = 0; m < vd->vdev_ms_count; m++) {
1551 		mdb_metaslab_t ms;
1552 		mdb_space_map_t sm = { 0 };
1553 		mdb_space_map_phys_t smp = { 0 };
1554 		mdb_range_tree_t rt;
1555 		uint64_t uallocs, ufrees, raw_free, raw_uchanges_mem;
1556 		char free[MDB_NICENUM_BUFLEN];
1557 		char uchanges_mem[MDB_NICENUM_BUFLEN];
1558 
1559 		if (mdb_ctf_vread(&ms, "metaslab_t", "mdb_metaslab_t",
1560 		    vdev_ms[m], 0) == -1)
1561 			return (DCMD_ERR);
1562 
1563 		if (ms.ms_sm != 0 &&
1564 		    mdb_ctf_vread(&sm, "space_map_t", "mdb_space_map_t",
1565 		    ms.ms_sm, 0) == -1)
1566 			return (DCMD_ERR);
1567 
1568 		if (mdb_ctf_vread(&rt, "range_tree_t", "mdb_range_tree_t",
1569 		    ms.ms_unflushed_frees, 0) == -1)
1570 			return (DCMD_ERR);
1571 		ufrees = rt.rt_space;
1572 		raw_uchanges_mem = rt.rt_root.bt_num_nodes * BTREE_LEAF_SIZE;
1573 
1574 		if (mdb_ctf_vread(&rt, "range_tree_t", "mdb_range_tree_t",
1575 		    ms.ms_unflushed_allocs, 0) == -1)
1576 			return (DCMD_ERR);
1577 		uallocs = rt.rt_space;
1578 		raw_uchanges_mem += rt.rt_root.bt_num_nodes * BTREE_LEAF_SIZE;
1579 		mdb_nicenum(raw_uchanges_mem, uchanges_mem);
1580 
1581 		raw_free = ms.ms_size;
1582 		if (ms.ms_sm != 0 && sm.sm_phys != 0) {
1583 			(void) mdb_ctf_vread(&smp, "space_map_phys_t",
1584 			    "mdb_space_map_phys_t", sm.sm_phys, 0);
1585 			raw_free -= smp.smp_alloc;
1586 		}
1587 		raw_free += ufrees - uallocs;
1588 		mdb_nicenum(raw_free, free);
1589 
1590 		mdb_printf("%0?p %6llu %20llx %10s ", vdev_ms[m], ms.ms_id,
1591 		    ms.ms_start, free);
1592 		if (ms.ms_fragmentation == ZFS_FRAG_INVALID)
1593 			mdb_printf("%9s ", "-");
1594 		else
1595 			mdb_printf("%9llu%% ", ms.ms_fragmentation);
1596 		mdb_printf("%10s\n", uchanges_mem);
1597 
1598 		if ((spa_flags & SPA_FLAG_HISTOGRAMS) && ms.ms_sm != 0 &&
1599 		    sm.sm_phys != 0) {
1600 			dump_histogram(smp.smp_histogram,
1601 			    SPACE_MAP_HISTOGRAM_SIZE, sm.sm_shift);
1602 		}
1603 	}
1604 	mdb_dec_indent(4);
1605 	return (DCMD_OK);
1606 }
1607 
1608 static int
1609 metaslab_group_stats(mdb_vdev_t *vd, int spa_flags)
1610 {
1611 	mdb_metaslab_group_t mg;
1612 	if (mdb_ctf_vread(&mg, "metaslab_group_t", "mdb_metaslab_group_t",
1613 	    vd->vdev_mg, 0) == -1) {
1614 		mdb_warn("failed to read vdev_mg at %p\n", vd->vdev_mg);
1615 		return (DCMD_ERR);
1616 	}
1617 
1618 	mdb_inc_indent(4);
1619 	mdb_printf("%<u>%-?s %7s %9s%</u>\n", "ADDR", "FRAG", "UCMU");
1620 
1621 	if (mg.mg_fragmentation == ZFS_FRAG_INVALID)
1622 		mdb_printf("%0?p %6s\n", vd->vdev_mg, "-");
1623 	else
1624 		mdb_printf("%0?p %6llu%%", vd->vdev_mg, mg.mg_fragmentation);
1625 
1626 
1627 	uintptr_t *vdev_ms = mdb_alloc(vd->vdev_ms_count * sizeof (vdev_ms),
1628 	    UM_SLEEP | UM_GC);
1629 	if (mdb_vread(vdev_ms, vd->vdev_ms_count * sizeof (uintptr_t),
1630 	    vd->vdev_ms) == -1) {
1631 		mdb_warn("failed to read vdev_ms at %p\n", vd->vdev_ms);
1632 		return (DCMD_ERR);
1633 	}
1634 
1635 	uint64_t raw_uchanges_mem = 0;
1636 	char uchanges_mem[MDB_NICENUM_BUFLEN];
1637 	for (int m = 0; m < vd->vdev_ms_count; m++) {
1638 		mdb_metaslab_t ms;
1639 		mdb_range_tree_t rt;
1640 
1641 		if (mdb_ctf_vread(&ms, "metaslab_t", "mdb_metaslab_t",
1642 		    vdev_ms[m], 0) == -1)
1643 			return (DCMD_ERR);
1644 
1645 		if (mdb_ctf_vread(&rt, "range_tree_t", "mdb_range_tree_t",
1646 		    ms.ms_unflushed_frees, 0) == -1)
1647 			return (DCMD_ERR);
1648 		raw_uchanges_mem += rt.rt_root.bt_num_nodes * BTREE_LEAF_SIZE;
1649 
1650 		if (mdb_ctf_vread(&rt, "range_tree_t", "mdb_range_tree_t",
1651 		    ms.ms_unflushed_allocs, 0) == -1)
1652 			return (DCMD_ERR);
1653 		raw_uchanges_mem += rt.rt_root.bt_num_nodes * BTREE_LEAF_SIZE;
1654 	}
1655 	mdb_nicenum(raw_uchanges_mem, uchanges_mem);
1656 	mdb_printf("%10s\n", uchanges_mem);
1657 
1658 	if (spa_flags & SPA_FLAG_HISTOGRAMS)
1659 		dump_histogram(mg.mg_histogram, RANGE_TREE_HISTOGRAM_SIZE, 0);
1660 	mdb_dec_indent(4);
1661 	return (DCMD_OK);
1662 }
1663 
1664 /*
1665  * ::vdev
1666  *
1667  * Print out a summarized vdev_t, in the following form:
1668  *
1669  * ADDR             STATE	AUX            DESC
1670  * fffffffbcde23df0 HEALTHY	-              /dev/dsk/c0t0d0
1671  *
1672  * If '-r' is specified, recursively visit all children.
1673  *
1674  * With '-e', the statistics associated with the vdev are printed as well.
1675  */
1676 static int
1677 do_print_vdev(uintptr_t addr, int flags, int depth, boolean_t recursive,
1678     int spa_flags)
1679 {
1680 	mdb_vdev_t vd;
1681 	if (mdb_ctf_vread(&vd, "vdev_t", "mdb_vdev_t",
1682 	    (uintptr_t)addr, 0) == -1)
1683 		return (DCMD_ERR);
1684 
1685 	if (flags & DCMD_PIPE_OUT) {
1686 		mdb_printf("%#lr\n", addr);
1687 	} else {
1688 		char desc[MAXNAMELEN];
1689 		if (vd.vdev_path != 0) {
1690 			if (mdb_readstr(desc, sizeof (desc),
1691 			    (uintptr_t)vd.vdev_path) == -1) {
1692 				mdb_warn("failed to read vdev_path at %p\n",
1693 				    vd.vdev_path);
1694 				return (DCMD_ERR);
1695 			}
1696 		} else if (vd.vdev_ops != 0) {
1697 			vdev_ops_t ops;
1698 			if (mdb_vread(&ops, sizeof (ops),
1699 			    (uintptr_t)vd.vdev_ops) == -1) {
1700 				mdb_warn("failed to read vdev_ops at %p\n",
1701 				    vd.vdev_ops);
1702 				return (DCMD_ERR);
1703 			}
1704 			(void) strcpy(desc, ops.vdev_op_type);
1705 		} else {
1706 			(void) strcpy(desc, "<unknown>");
1707 		}
1708 
1709 		if (depth == 0 && DCMD_HDRSPEC(flags))
1710 			mdb_printf("%<u>%-?s %-9s %-12s %-*s%</u>\n",
1711 			    "ADDR", "STATE", "AUX",
1712 			    sizeof (uintptr_t) == 4 ? 43 : 35,
1713 			    "DESCRIPTION");
1714 
1715 		mdb_printf("%0?p ", addr);
1716 
1717 		const char *state, *aux;
1718 		switch (vd.vdev_state) {
1719 		case VDEV_STATE_CLOSED:
1720 			state = "CLOSED";
1721 			break;
1722 		case VDEV_STATE_OFFLINE:
1723 			state = "OFFLINE";
1724 			break;
1725 		case VDEV_STATE_CANT_OPEN:
1726 			state = "CANT_OPEN";
1727 			break;
1728 		case VDEV_STATE_DEGRADED:
1729 			state = "DEGRADED";
1730 			break;
1731 		case VDEV_STATE_HEALTHY:
1732 			state = "HEALTHY";
1733 			break;
1734 		case VDEV_STATE_REMOVED:
1735 			state = "REMOVED";
1736 			break;
1737 		case VDEV_STATE_FAULTED:
1738 			state = "FAULTED";
1739 			break;
1740 		default:
1741 			state = "UNKNOWN";
1742 			break;
1743 		}
1744 
1745 		switch (vd.vdev_stat.vs_aux) {
1746 		case VDEV_AUX_NONE:
1747 			aux = "-";
1748 			break;
1749 		case VDEV_AUX_OPEN_FAILED:
1750 			aux = "OPEN_FAILED";
1751 			break;
1752 		case VDEV_AUX_CORRUPT_DATA:
1753 			aux = "CORRUPT_DATA";
1754 			break;
1755 		case VDEV_AUX_NO_REPLICAS:
1756 			aux = "NO_REPLICAS";
1757 			break;
1758 		case VDEV_AUX_BAD_GUID_SUM:
1759 			aux = "BAD_GUID_SUM";
1760 			break;
1761 		case VDEV_AUX_TOO_SMALL:
1762 			aux = "TOO_SMALL";
1763 			break;
1764 		case VDEV_AUX_BAD_LABEL:
1765 			aux = "BAD_LABEL";
1766 			break;
1767 		case VDEV_AUX_VERSION_NEWER:
1768 			aux = "VERS_NEWER";
1769 			break;
1770 		case VDEV_AUX_VERSION_OLDER:
1771 			aux = "VERS_OLDER";
1772 			break;
1773 		case VDEV_AUX_UNSUP_FEAT:
1774 			aux = "UNSUP_FEAT";
1775 			break;
1776 		case VDEV_AUX_SPARED:
1777 			aux = "SPARED";
1778 			break;
1779 		case VDEV_AUX_ERR_EXCEEDED:
1780 			aux = "ERR_EXCEEDED";
1781 			break;
1782 		case VDEV_AUX_IO_FAILURE:
1783 			aux = "IO_FAILURE";
1784 			break;
1785 		case VDEV_AUX_BAD_LOG:
1786 			aux = "BAD_LOG";
1787 			break;
1788 		case VDEV_AUX_EXTERNAL:
1789 			aux = "EXTERNAL";
1790 			break;
1791 		case VDEV_AUX_SPLIT_POOL:
1792 			aux = "SPLIT_POOL";
1793 			break;
1794 		case VDEV_AUX_CHILDREN_OFFLINE:
1795 			aux = "CHILDREN_OFFLINE";
1796 			break;
1797 		default:
1798 			aux = "UNKNOWN";
1799 			break;
1800 		}
1801 
1802 		mdb_printf("%-9s %-12s %*s%s\n", state, aux, depth, "", desc);
1803 
1804 		if (spa_flags & SPA_FLAG_ERRORS) {
1805 			int i;
1806 
1807 			mdb_inc_indent(4);
1808 			mdb_printf("\n");
1809 			mdb_printf("%<u>       %12s %12s %12s %12s "
1810 			    "%12s%</u>\n", "READ", "WRITE", "FREE", "CLAIM",
1811 			    "IOCTL");
1812 			mdb_printf("OPS     ");
1813 			for (i = 1; i < VS_ZIO_TYPES; i++)
1814 				mdb_printf("%11#llx%s",
1815 				    vd.vdev_stat.vs_ops[i],
1816 				    i == VS_ZIO_TYPES - 1 ? "" : "  ");
1817 			mdb_printf("\n");
1818 			mdb_printf("BYTES   ");
1819 			for (i = 1; i < VS_ZIO_TYPES; i++)
1820 				mdb_printf("%11#llx%s",
1821 				    vd.vdev_stat.vs_bytes[i],
1822 				    i == VS_ZIO_TYPES - 1 ? "" : "  ");
1823 
1824 
1825 			mdb_printf("\n");
1826 			mdb_printf("EREAD    %10#llx\n",
1827 			    vd.vdev_stat.vs_read_errors);
1828 			mdb_printf("EWRITE   %10#llx\n",
1829 			    vd.vdev_stat.vs_write_errors);
1830 			mdb_printf("ECKSUM   %10#llx\n",
1831 			    vd.vdev_stat.vs_checksum_errors);
1832 			mdb_dec_indent(4);
1833 			mdb_printf("\n");
1834 		}
1835 
1836 		if ((spa_flags & SPA_FLAG_METASLAB_GROUPS) &&
1837 		    vd.vdev_mg != 0) {
1838 			metaslab_group_stats(&vd, spa_flags);
1839 		}
1840 		if ((spa_flags & SPA_FLAG_METASLABS) && vd.vdev_ms != 0) {
1841 			metaslab_stats(&vd, spa_flags);
1842 		}
1843 	}
1844 
1845 	uint64_t children = vd.vdev_children;
1846 	if (children == 0 || !recursive)
1847 		return (DCMD_OK);
1848 
1849 	uintptr_t *child = mdb_alloc(children * sizeof (child),
1850 	    UM_SLEEP | UM_GC);
1851 	if (mdb_vread(child, children * sizeof (void *), vd.vdev_child) == -1) {
1852 		mdb_warn("failed to read vdev children at %p", vd.vdev_child);
1853 		return (DCMD_ERR);
1854 	}
1855 
1856 	for (uint64_t c = 0; c < children; c++) {
1857 		if (do_print_vdev(child[c], flags, depth + 2, recursive,
1858 		    spa_flags)) {
1859 			return (DCMD_ERR);
1860 		}
1861 	}
1862 
1863 	return (DCMD_OK);
1864 }
1865 
1866 static int
1867 vdev_print(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1868 {
1869 	uint64_t depth = 0;
1870 	boolean_t recursive = B_FALSE;
1871 	int spa_flags = 0;
1872 
1873 	if (mdb_getopts(argc, argv,
1874 	    'e', MDB_OPT_SETBITS, SPA_FLAG_ERRORS, &spa_flags,
1875 	    'm', MDB_OPT_SETBITS, SPA_FLAG_METASLABS, &spa_flags,
1876 	    'M', MDB_OPT_SETBITS, SPA_FLAG_METASLAB_GROUPS, &spa_flags,
1877 	    'h', MDB_OPT_SETBITS, SPA_FLAG_HISTOGRAMS, &spa_flags,
1878 	    'r', MDB_OPT_SETBITS, TRUE, &recursive,
1879 	    'd', MDB_OPT_UINT64, &depth, NULL) != argc)
1880 		return (DCMD_USAGE);
1881 
1882 	if (!(flags & DCMD_ADDRSPEC)) {
1883 		mdb_warn("no vdev_t address given\n");
1884 		return (DCMD_ERR);
1885 	}
1886 
1887 	return (do_print_vdev(addr, flags, (int)depth, recursive, spa_flags));
1888 }
1889 
1890 typedef struct mdb_metaslab_alloc_trace {
1891 	uintptr_t mat_mg;
1892 	uintptr_t mat_msp;
1893 	uint64_t mat_size;
1894 	uint64_t mat_weight;
1895 	uint64_t mat_offset;
1896 	uint32_t mat_dva_id;
1897 	int mat_allocator;
1898 } mdb_metaslab_alloc_trace_t;
1899 
1900 static void
1901 metaslab_print_weight(uint64_t weight)
1902 {
1903 	char buf[100];
1904 
1905 	if (WEIGHT_IS_SPACEBASED(weight)) {
1906 		mdb_nicenum(
1907 		    weight & ~(METASLAB_ACTIVE_MASK | METASLAB_WEIGHT_TYPE),
1908 		    buf);
1909 	} else {
1910 		char size[MDB_NICENUM_BUFLEN];
1911 		mdb_nicenum(1ULL << WEIGHT_GET_INDEX(weight), size);
1912 		(void) mdb_snprintf(buf, sizeof (buf), "%llu x %s",
1913 		    WEIGHT_GET_COUNT(weight), size);
1914 	}
1915 	mdb_printf("%11s ", buf);
1916 }
1917 
1918 /* ARGSUSED */
1919 static int
1920 metaslab_weight(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1921 {
1922 	uint64_t weight = 0;
1923 	char active;
1924 
1925 	if (argc == 0 && (flags & DCMD_ADDRSPEC)) {
1926 		if (mdb_vread(&weight, sizeof (uint64_t), addr) == -1) {
1927 			mdb_warn("failed to read weight at %p\n", addr);
1928 			return (DCMD_ERR);
1929 		}
1930 	} else if (argc == 1 && !(flags & DCMD_ADDRSPEC)) {
1931 		weight = (argv[0].a_type == MDB_TYPE_IMMEDIATE) ?
1932 		    argv[0].a_un.a_val : mdb_strtoull(argv[0].a_un.a_str);
1933 	} else {
1934 		return (DCMD_USAGE);
1935 	}
1936 
1937 	if (DCMD_HDRSPEC(flags)) {
1938 		mdb_printf("%<u>%-6s %9s %9s%</u>\n",
1939 		    "ACTIVE", "ALGORITHM", "WEIGHT");
1940 	}
1941 
1942 	if (weight & METASLAB_WEIGHT_PRIMARY)
1943 		active = 'P';
1944 	else if (weight & METASLAB_WEIGHT_SECONDARY)
1945 		active = 'S';
1946 	else
1947 		active = '-';
1948 	mdb_printf("%6c %8s ", active,
1949 	    WEIGHT_IS_SPACEBASED(weight) ? "SPACE" : "SEGMENT");
1950 	metaslab_print_weight(weight);
1951 	mdb_printf("\n");
1952 
1953 	return (DCMD_OK);
1954 }
1955 
1956 /* ARGSUSED */
1957 static int
1958 metaslab_trace(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1959 {
1960 	mdb_metaslab_alloc_trace_t mat;
1961 	mdb_metaslab_group_t mg = { 0 };
1962 	char result_type[100];
1963 
1964 	if (mdb_ctf_vread(&mat, "metaslab_alloc_trace_t",
1965 	    "mdb_metaslab_alloc_trace_t", addr, 0) == -1) {
1966 		return (DCMD_ERR);
1967 	}
1968 
1969 	if (!(flags & DCMD_PIPE_OUT) && DCMD_HDRSPEC(flags)) {
1970 		mdb_printf("%<u>%6s %6s %8s %11s %11s %18s %18s%</u>\n",
1971 		    "MSID", "DVA", "ASIZE", "ALLOCATOR", "WEIGHT", "RESULT",
1972 		    "VDEV");
1973 	}
1974 
1975 	if (mat.mat_msp != 0) {
1976 		mdb_metaslab_t ms;
1977 
1978 		if (mdb_ctf_vread(&ms, "metaslab_t", "mdb_metaslab_t",
1979 		    mat.mat_msp, 0) == -1) {
1980 			return (DCMD_ERR);
1981 		}
1982 		mdb_printf("%6llu ", ms.ms_id);
1983 	} else {
1984 		mdb_printf("%6s ", "-");
1985 	}
1986 
1987 	mdb_printf("%6d %8llx %11llx ", mat.mat_dva_id, mat.mat_size,
1988 	    mat.mat_allocator);
1989 
1990 	metaslab_print_weight(mat.mat_weight);
1991 
1992 	if ((int64_t)mat.mat_offset < 0) {
1993 		if (enum_lookup("enum trace_alloc_type", mat.mat_offset,
1994 		    "TRACE_", sizeof (result_type), result_type) == -1) {
1995 			mdb_warn("Could not find enum for trace_alloc_type");
1996 			return (DCMD_ERR);
1997 		}
1998 		mdb_printf("%18s ", result_type);
1999 	} else {
2000 		mdb_printf("%<b>%18llx%</b> ", mat.mat_offset);
2001 	}
2002 
2003 	if (mat.mat_mg != 0 &&
2004 	    mdb_ctf_vread(&mg, "metaslab_group_t", "mdb_metaslab_group_t",
2005 	    mat.mat_mg, 0) == -1) {
2006 		return (DCMD_ERR);
2007 	}
2008 
2009 	if (mg.mg_vd != 0) {
2010 		mdb_vdev_t vdev;
2011 		char desc[MAXNAMELEN];
2012 
2013 		if (mdb_ctf_vread(&vdev, "vdev_t", "mdb_vdev_t",
2014 		    mg.mg_vd, 0) == -1) {
2015 			return (DCMD_ERR);
2016 		}
2017 
2018 		if (vdev.vdev_path != 0) {
2019 			char path[MAXNAMELEN];
2020 
2021 			if (mdb_readstr(path, sizeof (path),
2022 			    vdev.vdev_path) == -1) {
2023 				mdb_warn("failed to read vdev_path at %p\n",
2024 				    vdev.vdev_path);
2025 				return (DCMD_ERR);
2026 			}
2027 			char *slash;
2028 			if ((slash = strrchr(path, '/')) != NULL) {
2029 				strcpy(desc, slash + 1);
2030 			} else {
2031 				strcpy(desc, path);
2032 			}
2033 		} else if (vdev.vdev_ops != 0) {
2034 			mdb_vdev_ops_t ops;
2035 			if (mdb_ctf_vread(&ops, "vdev_ops_t", "mdb_vdev_ops_t",
2036 			    vdev.vdev_ops, 0) == -1) {
2037 				mdb_warn("failed to read vdev_ops at %p\n",
2038 				    vdev.vdev_ops);
2039 				return (DCMD_ERR);
2040 			}
2041 			(void) mdb_snprintf(desc, sizeof (desc),
2042 			    "%s-%llu", ops.vdev_op_type, vdev.vdev_id);
2043 		} else {
2044 			(void) strcpy(desc, "<unknown>");
2045 		}
2046 		mdb_printf("%18s\n", desc);
2047 	}
2048 
2049 	return (DCMD_OK);
2050 }
2051 
2052 typedef struct metaslab_walk_data {
2053 	uint64_t mw_numvdevs;
2054 	uintptr_t *mw_vdevs;
2055 	int mw_curvdev;
2056 	uint64_t mw_nummss;
2057 	uintptr_t *mw_mss;
2058 	int mw_curms;
2059 } metaslab_walk_data_t;
2060 
2061 static int
2062 metaslab_walk_step(mdb_walk_state_t *wsp)
2063 {
2064 	metaslab_walk_data_t *mw = wsp->walk_data;
2065 	metaslab_t ms;
2066 	uintptr_t msp;
2067 
2068 	if (mw->mw_curvdev >= mw->mw_numvdevs)
2069 		return (WALK_DONE);
2070 
2071 	if (mw->mw_mss == NULL) {
2072 		uintptr_t mssp;
2073 		uintptr_t vdevp;
2074 
2075 		ASSERT(mw->mw_curms == 0);
2076 		ASSERT(mw->mw_nummss == 0);
2077 
2078 		vdevp = mw->mw_vdevs[mw->mw_curvdev];
2079 		if (GETMEMB(vdevp, "vdev", vdev_ms, mssp) ||
2080 		    GETMEMB(vdevp, "vdev", vdev_ms_count, mw->mw_nummss)) {
2081 			return (WALK_ERR);
2082 		}
2083 
2084 		mw->mw_mss = mdb_alloc(mw->mw_nummss * sizeof (void*),
2085 		    UM_SLEEP | UM_GC);
2086 		if (mdb_vread(mw->mw_mss, mw->mw_nummss * sizeof (void*),
2087 		    mssp) == -1) {
2088 			mdb_warn("failed to read vdev_ms at %p", mssp);
2089 			return (WALK_ERR);
2090 		}
2091 	}
2092 
2093 	if (mw->mw_curms >= mw->mw_nummss) {
2094 		mw->mw_mss = NULL;
2095 		mw->mw_curms = 0;
2096 		mw->mw_nummss = 0;
2097 		mw->mw_curvdev++;
2098 		return (WALK_NEXT);
2099 	}
2100 
2101 	msp = mw->mw_mss[mw->mw_curms];
2102 	if (mdb_vread(&ms, sizeof (metaslab_t), msp) == -1) {
2103 		mdb_warn("failed to read metaslab_t at %p", msp);
2104 		return (WALK_ERR);
2105 	}
2106 
2107 	mw->mw_curms++;
2108 
2109 	return (wsp->walk_callback(msp, &ms, wsp->walk_cbdata));
2110 }
2111 
2112 static int
2113 metaslab_walk_init(mdb_walk_state_t *wsp)
2114 {
2115 	metaslab_walk_data_t *mw;
2116 	uintptr_t root_vdevp;
2117 	uintptr_t childp;
2118 
2119 	if (wsp->walk_addr == 0) {
2120 		mdb_warn("must supply address of spa_t\n");
2121 		return (WALK_ERR);
2122 	}
2123 
2124 	mw = mdb_zalloc(sizeof (metaslab_walk_data_t), UM_SLEEP | UM_GC);
2125 
2126 	if (GETMEMB(wsp->walk_addr, "spa", spa_root_vdev, root_vdevp) ||
2127 	    GETMEMB(root_vdevp, "vdev", vdev_children, mw->mw_numvdevs) ||
2128 	    GETMEMB(root_vdevp, "vdev", vdev_child, childp)) {
2129 		return (DCMD_ERR);
2130 	}
2131 
2132 	mw->mw_vdevs = mdb_alloc(mw->mw_numvdevs * sizeof (void *),
2133 	    UM_SLEEP | UM_GC);
2134 	if (mdb_vread(mw->mw_vdevs, mw->mw_numvdevs * sizeof (void *),
2135 	    childp) == -1) {
2136 		mdb_warn("failed to read root vdev children at %p", childp);
2137 		return (DCMD_ERR);
2138 	}
2139 
2140 	wsp->walk_data = mw;
2141 
2142 	return (WALK_NEXT);
2143 }
2144 
2145 typedef struct mdb_spa {
2146 	uintptr_t spa_dsl_pool;
2147 	uintptr_t spa_root_vdev;
2148 } mdb_spa_t;
2149 
2150 typedef struct mdb_dsl_pool {
2151 	uintptr_t dp_root_dir;
2152 } mdb_dsl_pool_t;
2153 
2154 typedef struct mdb_dsl_dir {
2155 	uintptr_t dd_dbuf;
2156 	int64_t dd_space_towrite[TXG_SIZE];
2157 } mdb_dsl_dir_t;
2158 
2159 typedef struct mdb_dsl_dir_phys {
2160 	uint64_t dd_used_bytes;
2161 	uint64_t dd_compressed_bytes;
2162 	uint64_t dd_uncompressed_bytes;
2163 } mdb_dsl_dir_phys_t;
2164 
2165 typedef struct space_data {
2166 	uint64_t ms_allocating[TXG_SIZE];
2167 	uint64_t ms_checkpointing;
2168 	uint64_t ms_freeing;
2169 	uint64_t ms_freed;
2170 	uint64_t ms_unflushed_frees;
2171 	uint64_t ms_unflushed_allocs;
2172 	uint64_t ms_allocatable;
2173 	int64_t ms_deferspace;
2174 	uint64_t avail;
2175 } space_data_t;
2176 
2177 /* ARGSUSED */
2178 static int
2179 space_cb(uintptr_t addr, const void *unknown, void *arg)
2180 {
2181 	space_data_t *sd = arg;
2182 	mdb_metaslab_t ms;
2183 	mdb_range_tree_t rt;
2184 	mdb_space_map_t sm = { 0 };
2185 	mdb_space_map_phys_t smp = { 0 };
2186 	uint64_t uallocs, ufrees;
2187 	int i;
2188 
2189 	if (mdb_ctf_vread(&ms, "metaslab_t", "mdb_metaslab_t",
2190 	    addr, 0) == -1)
2191 		return (WALK_ERR);
2192 
2193 	for (i = 0; i < TXG_SIZE; i++) {
2194 		if (mdb_ctf_vread(&rt, "range_tree_t",
2195 		    "mdb_range_tree_t", ms.ms_allocating[i], 0) == -1)
2196 			return (WALK_ERR);
2197 		sd->ms_allocating[i] += rt.rt_space;
2198 	}
2199 
2200 	if (mdb_ctf_vread(&rt, "range_tree_t",
2201 	    "mdb_range_tree_t", ms.ms_checkpointing, 0) == -1)
2202 		return (WALK_ERR);
2203 	sd->ms_checkpointing += rt.rt_space;
2204 
2205 	if (mdb_ctf_vread(&rt, "range_tree_t",
2206 	    "mdb_range_tree_t", ms.ms_freeing, 0) == -1)
2207 		return (WALK_ERR);
2208 	sd->ms_freeing += rt.rt_space;
2209 
2210 	if (mdb_ctf_vread(&rt, "range_tree_t",
2211 	    "mdb_range_tree_t", ms.ms_freed, 0) == -1)
2212 		return (WALK_ERR);
2213 	sd->ms_freed += rt.rt_space;
2214 
2215 	if (mdb_ctf_vread(&rt, "range_tree_t",
2216 	    "mdb_range_tree_t", ms.ms_allocatable, 0) == -1)
2217 		return (WALK_ERR);
2218 	sd->ms_allocatable += rt.rt_space;
2219 
2220 	if (mdb_ctf_vread(&rt, "range_tree_t",
2221 	    "mdb_range_tree_t", ms.ms_unflushed_frees, 0) == -1)
2222 		return (WALK_ERR);
2223 	sd->ms_unflushed_frees += rt.rt_space;
2224 	ufrees = rt.rt_space;
2225 
2226 	if (mdb_ctf_vread(&rt, "range_tree_t",
2227 	    "mdb_range_tree_t", ms.ms_unflushed_allocs, 0) == -1)
2228 		return (WALK_ERR);
2229 	sd->ms_unflushed_allocs += rt.rt_space;
2230 	uallocs = rt.rt_space;
2231 
2232 	if (ms.ms_sm != 0 &&
2233 	    mdb_ctf_vread(&sm, "space_map_t",
2234 	    "mdb_space_map_t", ms.ms_sm, 0) == -1)
2235 		return (WALK_ERR);
2236 
2237 	if (sm.sm_phys != 0) {
2238 		(void) mdb_ctf_vread(&smp, "space_map_phys_t",
2239 		    "mdb_space_map_phys_t", sm.sm_phys, 0);
2240 	}
2241 
2242 	sd->ms_deferspace += ms.ms_deferspace;
2243 	sd->avail += sm.sm_size - smp.smp_alloc + ufrees - uallocs;
2244 
2245 	return (WALK_NEXT);
2246 }
2247 
2248 /*
2249  * ::spa_space [-b]
2250  *
2251  * Given a spa_t, print out it's on-disk space usage and in-core
2252  * estimates of future usage.  If -b is given, print space in bytes.
2253  * Otherwise print in megabytes.
2254  */
2255 /* ARGSUSED */
2256 static int
2257 spa_space(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
2258 {
2259 	mdb_spa_t spa;
2260 	mdb_dsl_pool_t dp;
2261 	mdb_dsl_dir_t dd;
2262 	mdb_dmu_buf_impl_t db;
2263 	mdb_dsl_dir_phys_t dsp;
2264 	space_data_t sd;
2265 	int shift = 20;
2266 	char *suffix = "M";
2267 	int bytes = B_FALSE;
2268 
2269 	if (mdb_getopts(argc, argv, 'b', MDB_OPT_SETBITS, TRUE, &bytes, NULL) !=
2270 	    argc)
2271 		return (DCMD_USAGE);
2272 	if (!(flags & DCMD_ADDRSPEC))
2273 		return (DCMD_USAGE);
2274 
2275 	if (bytes) {
2276 		shift = 0;
2277 		suffix = "";
2278 	}
2279 
2280 	if (mdb_ctf_vread(&spa, ZFS_STRUCT "spa", "mdb_spa_t",
2281 	    addr, 0) == -1 ||
2282 	    mdb_ctf_vread(&dp, ZFS_STRUCT "dsl_pool", "mdb_dsl_pool_t",
2283 	    spa.spa_dsl_pool, 0) == -1 ||
2284 	    mdb_ctf_vread(&dd, ZFS_STRUCT "dsl_dir", "mdb_dsl_dir_t",
2285 	    dp.dp_root_dir, 0) == -1 ||
2286 	    mdb_ctf_vread(&db, ZFS_STRUCT "dmu_buf_impl", "mdb_dmu_buf_impl_t",
2287 	    dd.dd_dbuf, 0) == -1 ||
2288 	    mdb_ctf_vread(&dsp, ZFS_STRUCT "dsl_dir_phys",
2289 	    "mdb_dsl_dir_phys_t", db.db.db_data, 0) == -1) {
2290 		return (DCMD_ERR);
2291 	}
2292 
2293 	mdb_printf("dd_space_towrite = %llu%s %llu%s %llu%s %llu%s\n",
2294 	    dd.dd_space_towrite[0] >> shift, suffix,
2295 	    dd.dd_space_towrite[1] >> shift, suffix,
2296 	    dd.dd_space_towrite[2] >> shift, suffix,
2297 	    dd.dd_space_towrite[3] >> shift, suffix);
2298 
2299 	mdb_printf("dd_phys.dd_used_bytes = %llu%s\n",
2300 	    dsp.dd_used_bytes >> shift, suffix);
2301 	mdb_printf("dd_phys.dd_compressed_bytes = %llu%s\n",
2302 	    dsp.dd_compressed_bytes >> shift, suffix);
2303 	mdb_printf("dd_phys.dd_uncompressed_bytes = %llu%s\n",
2304 	    dsp.dd_uncompressed_bytes >> shift, suffix);
2305 
2306 	bzero(&sd, sizeof (sd));
2307 	if (mdb_pwalk("metaslab", space_cb, &sd, addr) != 0) {
2308 		mdb_warn("can't walk metaslabs");
2309 		return (DCMD_ERR);
2310 	}
2311 
2312 	mdb_printf("ms_allocmap = %llu%s %llu%s %llu%s %llu%s\n",
2313 	    sd.ms_allocating[0] >> shift, suffix,
2314 	    sd.ms_allocating[1] >> shift, suffix,
2315 	    sd.ms_allocating[2] >> shift, suffix,
2316 	    sd.ms_allocating[3] >> shift, suffix);
2317 	mdb_printf("ms_checkpointing = %llu%s\n",
2318 	    sd.ms_checkpointing >> shift, suffix);
2319 	mdb_printf("ms_freeing = %llu%s\n",
2320 	    sd.ms_freeing >> shift, suffix);
2321 	mdb_printf("ms_freed = %llu%s\n",
2322 	    sd.ms_freed >> shift, suffix);
2323 	mdb_printf("ms_unflushed_frees = %llu%s\n",
2324 	    sd.ms_unflushed_frees >> shift, suffix);
2325 	mdb_printf("ms_unflushed_allocs = %llu%s\n",
2326 	    sd.ms_unflushed_allocs >> shift, suffix);
2327 	mdb_printf("ms_allocatable = %llu%s\n",
2328 	    sd.ms_allocatable >> shift, suffix);
2329 	mdb_printf("ms_deferspace = %llu%s\n",
2330 	    sd.ms_deferspace >> shift, suffix);
2331 	mdb_printf("current avail = %llu%s\n",
2332 	    sd.avail >> shift, suffix);
2333 
2334 	return (DCMD_OK);
2335 }
2336 
2337 typedef struct mdb_spa_aux_vdev {
2338 	int sav_count;
2339 	uintptr_t sav_vdevs;
2340 } mdb_spa_aux_vdev_t;
2341 
2342 typedef struct mdb_spa_vdevs {
2343 	uintptr_t spa_root_vdev;
2344 	mdb_spa_aux_vdev_t spa_l2cache;
2345 	mdb_spa_aux_vdev_t spa_spares;
2346 } mdb_spa_vdevs_t;
2347 
2348 static int
2349 spa_print_aux(mdb_spa_aux_vdev_t *sav, uint_t flags, mdb_arg_t *v,
2350     const char *name)
2351 {
2352 	uintptr_t *aux;
2353 	size_t len;
2354 	int ret, i;
2355 
2356 	/*
2357 	 * Iterate over aux vdevs and print those out as well.  This is a
2358 	 * little annoying because we don't have a root vdev to pass to ::vdev.
2359 	 * Instead, we print a single line and then call it for each child
2360 	 * vdev.
2361 	 */
2362 	if (sav->sav_count != 0) {
2363 		v[1].a_type = MDB_TYPE_STRING;
2364 		v[1].a_un.a_str = "-d";
2365 		v[2].a_type = MDB_TYPE_IMMEDIATE;
2366 		v[2].a_un.a_val = 2;
2367 
2368 		len = sav->sav_count * sizeof (uintptr_t);
2369 		aux = mdb_alloc(len, UM_SLEEP);
2370 		if (mdb_vread(aux, len, sav->sav_vdevs) == -1) {
2371 			mdb_free(aux, len);
2372 			mdb_warn("failed to read l2cache vdevs at %p",
2373 			    sav->sav_vdevs);
2374 			return (DCMD_ERR);
2375 		}
2376 
2377 		mdb_printf("%-?s %-9s %-12s %s\n", "-", "-", "-", name);
2378 
2379 		for (i = 0; i < sav->sav_count; i++) {
2380 			ret = mdb_call_dcmd("vdev", aux[i], flags, 3, v);
2381 			if (ret != DCMD_OK) {
2382 				mdb_free(aux, len);
2383 				return (ret);
2384 			}
2385 		}
2386 
2387 		mdb_free(aux, len);
2388 	}
2389 
2390 	return (0);
2391 }
2392 
2393 /*
2394  * ::spa_vdevs
2395  *
2396  *	-e	Include error stats
2397  *	-m	Include metaslab information
2398  *	-M	Include metaslab group information
2399  *	-h	Include histogram information (requires -m or -M)
2400  *
2401  * Print out a summarized list of vdevs for the given spa_t.
2402  * This is accomplished by invoking "::vdev -re" on the root vdev, as well as
2403  * iterating over the cache devices.
2404  */
2405 /* ARGSUSED */
2406 static int
2407 spa_vdevs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
2408 {
2409 	mdb_arg_t v[3];
2410 	int ret;
2411 	char opts[100] = "-r";
2412 	int spa_flags = 0;
2413 
2414 	if (mdb_getopts(argc, argv,
2415 	    'e', MDB_OPT_SETBITS, SPA_FLAG_ERRORS, &spa_flags,
2416 	    'm', MDB_OPT_SETBITS, SPA_FLAG_METASLABS, &spa_flags,
2417 	    'M', MDB_OPT_SETBITS, SPA_FLAG_METASLAB_GROUPS, &spa_flags,
2418 	    'h', MDB_OPT_SETBITS, SPA_FLAG_HISTOGRAMS, &spa_flags,
2419 	    NULL) != argc)
2420 		return (DCMD_USAGE);
2421 
2422 	if (!(flags & DCMD_ADDRSPEC))
2423 		return (DCMD_USAGE);
2424 
2425 	mdb_spa_vdevs_t spa;
2426 	if (mdb_ctf_vread(&spa, "spa_t", "mdb_spa_vdevs_t", addr, 0) == -1)
2427 		return (DCMD_ERR);
2428 
2429 	/*
2430 	 * Unitialized spa_t structures can have a NULL root vdev.
2431 	 */
2432 	if (spa.spa_root_vdev == 0) {
2433 		mdb_printf("no associated vdevs\n");
2434 		return (DCMD_OK);
2435 	}
2436 
2437 	if (spa_flags & SPA_FLAG_ERRORS)
2438 		strcat(opts, "e");
2439 	if (spa_flags & SPA_FLAG_METASLABS)
2440 		strcat(opts, "m");
2441 	if (spa_flags & SPA_FLAG_METASLAB_GROUPS)
2442 		strcat(opts, "M");
2443 	if (spa_flags & SPA_FLAG_HISTOGRAMS)
2444 		strcat(opts, "h");
2445 
2446 	v[0].a_type = MDB_TYPE_STRING;
2447 	v[0].a_un.a_str = opts;
2448 
2449 	ret = mdb_call_dcmd("vdev", (uintptr_t)spa.spa_root_vdev,
2450 	    flags, 1, v);
2451 	if (ret != DCMD_OK)
2452 		return (ret);
2453 
2454 	if (spa_print_aux(&spa.spa_l2cache, flags, v, "cache") != 0 ||
2455 	    spa_print_aux(&spa.spa_spares, flags, v, "spares") != 0)
2456 		return (DCMD_ERR);
2457 
2458 	return (DCMD_OK);
2459 }
2460 
2461 /*
2462  * ::zio
2463  *
2464  * Print a summary of zio_t and all its children.  This is intended to display a
2465  * zio tree, and hence we only pick the most important pieces of information for
2466  * the main summary.  More detailed information can always be found by doing a
2467  * '::print zio' on the underlying zio_t.  The columns we display are:
2468  *
2469  *	ADDRESS  TYPE  STAGE  WAITER  TIME_ELAPSED
2470  *
2471  * The 'address' column is indented by one space for each depth level as we
2472  * descend down the tree.
2473  */
2474 
2475 #define	ZIO_MAXINDENT	7
2476 #define	ZIO_MAXWIDTH	(sizeof (uintptr_t) * 2 + ZIO_MAXINDENT)
2477 #define	ZIO_WALK_SELF	0
2478 #define	ZIO_WALK_CHILD	1
2479 #define	ZIO_WALK_PARENT	2
2480 
2481 typedef struct zio_print_args {
2482 	int	zpa_current_depth;
2483 	int	zpa_min_depth;
2484 	int	zpa_max_depth;
2485 	int	zpa_type;
2486 	uint_t	zpa_flags;
2487 } zio_print_args_t;
2488 
2489 typedef struct mdb_zio {
2490 	enum zio_type io_type;
2491 	enum zio_stage io_stage;
2492 	uintptr_t io_waiter;
2493 	uintptr_t io_spa;
2494 	struct {
2495 		struct {
2496 			uintptr_t list_next;
2497 		} list_head;
2498 	} io_parent_list;
2499 	int io_error;
2500 } mdb_zio_t;
2501 
2502 typedef struct mdb_zio_timestamp {
2503 	hrtime_t io_timestamp;
2504 } mdb_zio_timestamp_t;
2505 
2506 static int zio_child_cb(uintptr_t addr, const void *unknown, void *arg);
2507 
2508 static int
2509 zio_print_cb(uintptr_t addr, zio_print_args_t *zpa)
2510 {
2511 	mdb_ctf_id_t type_enum, stage_enum;
2512 	int indent = zpa->zpa_current_depth;
2513 	const char *type, *stage;
2514 	uintptr_t laddr;
2515 	mdb_zio_t zio;
2516 	mdb_zio_timestamp_t zio_timestamp = { 0 };
2517 
2518 	if (mdb_ctf_vread(&zio, ZFS_STRUCT "zio", "mdb_zio_t", addr, 0) == -1)
2519 		return (WALK_ERR);
2520 	(void) mdb_ctf_vread(&zio_timestamp, ZFS_STRUCT "zio",
2521 	    "mdb_zio_timestamp_t", addr, MDB_CTF_VREAD_QUIET);
2522 
2523 	if (indent > ZIO_MAXINDENT)
2524 		indent = ZIO_MAXINDENT;
2525 
2526 	if (mdb_ctf_lookup_by_name("enum zio_type", &type_enum) == -1 ||
2527 	    mdb_ctf_lookup_by_name("enum zio_stage", &stage_enum) == -1) {
2528 		mdb_warn("failed to lookup zio enums");
2529 		return (WALK_ERR);
2530 	}
2531 
2532 	if ((type = mdb_ctf_enum_name(type_enum, zio.io_type)) != NULL)
2533 		type += sizeof ("ZIO_TYPE_") - 1;
2534 	else
2535 		type = "?";
2536 
2537 	if (zio.io_error == 0) {
2538 		stage = mdb_ctf_enum_name(stage_enum, zio.io_stage);
2539 		if (stage != NULL)
2540 			stage += sizeof ("ZIO_STAGE_") - 1;
2541 		else
2542 			stage = "?";
2543 	} else {
2544 		stage = "FAILED";
2545 	}
2546 
2547 	if (zpa->zpa_current_depth >= zpa->zpa_min_depth) {
2548 		if (zpa->zpa_flags & DCMD_PIPE_OUT) {
2549 			mdb_printf("%?p\n", addr);
2550 		} else {
2551 			mdb_printf("%*s%-*p %-5s %-16s ", indent, "",
2552 			    ZIO_MAXWIDTH - indent, addr, type, stage);
2553 			if (zio.io_waiter != 0)
2554 				mdb_printf("%-16lx ", zio.io_waiter);
2555 			else
2556 				mdb_printf("%-16s ", "-");
2557 #ifdef _KERNEL
2558 			if (zio_timestamp.io_timestamp != 0) {
2559 				mdb_printf("%llums", (mdb_gethrtime() -
2560 				    zio_timestamp.io_timestamp) /
2561 				    1000000);
2562 			} else {
2563 				mdb_printf("%-12s ", "-");
2564 			}
2565 #else
2566 			mdb_printf("%-12s ", "-");
2567 #endif
2568 			mdb_printf("\n");
2569 		}
2570 	}
2571 
2572 	if (zpa->zpa_current_depth >= zpa->zpa_max_depth)
2573 		return (WALK_NEXT);
2574 
2575 	if (zpa->zpa_type == ZIO_WALK_PARENT)
2576 		laddr = addr + mdb_ctf_offsetof_by_name(ZFS_STRUCT "zio",
2577 		    "io_parent_list");
2578 	else
2579 		laddr = addr + mdb_ctf_offsetof_by_name(ZFS_STRUCT "zio",
2580 		    "io_child_list");
2581 
2582 	zpa->zpa_current_depth++;
2583 	if (mdb_pwalk("list", zio_child_cb, zpa, laddr) != 0) {
2584 		mdb_warn("failed to walk zio_t children at %p\n", laddr);
2585 		return (WALK_ERR);
2586 	}
2587 	zpa->zpa_current_depth--;
2588 
2589 	return (WALK_NEXT);
2590 }
2591 
2592 /* ARGSUSED */
2593 static int
2594 zio_child_cb(uintptr_t addr, const void *unknown, void *arg)
2595 {
2596 	zio_link_t zl;
2597 	uintptr_t ziop;
2598 	zio_print_args_t *zpa = arg;
2599 
2600 	if (mdb_vread(&zl, sizeof (zl), addr) == -1) {
2601 		mdb_warn("failed to read zio_link_t at %p", addr);
2602 		return (WALK_ERR);
2603 	}
2604 
2605 	if (zpa->zpa_type == ZIO_WALK_PARENT)
2606 		ziop = (uintptr_t)zl.zl_parent;
2607 	else
2608 		ziop = (uintptr_t)zl.zl_child;
2609 
2610 	return (zio_print_cb(ziop, zpa));
2611 }
2612 
2613 /* ARGSUSED */
2614 static int
2615 zio_print(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
2616 {
2617 	zio_print_args_t zpa = { 0 };
2618 
2619 	if (!(flags & DCMD_ADDRSPEC))
2620 		return (DCMD_USAGE);
2621 
2622 	if (mdb_getopts(argc, argv,
2623 	    'r', MDB_OPT_SETBITS, INT_MAX, &zpa.zpa_max_depth,
2624 	    'c', MDB_OPT_SETBITS, ZIO_WALK_CHILD, &zpa.zpa_type,
2625 	    'p', MDB_OPT_SETBITS, ZIO_WALK_PARENT, &zpa.zpa_type,
2626 	    NULL) != argc)
2627 		return (DCMD_USAGE);
2628 
2629 	zpa.zpa_flags = flags;
2630 	if (zpa.zpa_max_depth != 0) {
2631 		if (zpa.zpa_type == ZIO_WALK_SELF)
2632 			zpa.zpa_type = ZIO_WALK_CHILD;
2633 	} else if (zpa.zpa_type != ZIO_WALK_SELF) {
2634 		zpa.zpa_min_depth = 1;
2635 		zpa.zpa_max_depth = 1;
2636 	}
2637 
2638 	if (!(flags & DCMD_PIPE_OUT) && DCMD_HDRSPEC(flags)) {
2639 		mdb_printf("%<u>%-*s %-5s %-16s %-16s %-12s%</u>\n",
2640 		    ZIO_MAXWIDTH, "ADDRESS", "TYPE", "STAGE", "WAITER",
2641 		    "TIME_ELAPSED");
2642 	}
2643 
2644 	if (zio_print_cb(addr, &zpa) != WALK_NEXT)
2645 		return (DCMD_ERR);
2646 
2647 	return (DCMD_OK);
2648 }
2649 
2650 /*
2651  * [addr]::zio_state
2652  *
2653  * Print a summary of all zio_t structures on the system, or for a particular
2654  * pool.  This is equivalent to '::walk zio_root | ::zio'.
2655  */
2656 /*ARGSUSED*/
2657 static int
2658 zio_state(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
2659 {
2660 	/*
2661 	 * MDB will remember the last address of the pipeline, so if we don't
2662 	 * zero this we'll end up trying to walk zio structures for a
2663 	 * non-existent spa_t.
2664 	 */
2665 	if (!(flags & DCMD_ADDRSPEC))
2666 		addr = 0;
2667 
2668 	return (mdb_pwalk_dcmd("zio_root", "zio", argc, argv, addr));
2669 }
2670 
2671 
2672 typedef struct mdb_zfs_btree_hdr {
2673 	uintptr_t		bth_parent;
2674 	boolean_t		bth_core;
2675 	/*
2676 	 * For both leaf and core nodes, represents the number of elements in
2677 	 * the node. For core nodes, they will have bth_count + 1 children.
2678 	 */
2679 	uint32_t		bth_count;
2680 } mdb_zfs_btree_hdr_t;
2681 
2682 typedef struct mdb_zfs_btree_core {
2683 	mdb_zfs_btree_hdr_t	btc_hdr;
2684 	uintptr_t		btc_children[BTREE_CORE_ELEMS + 1];
2685 	uint8_t			btc_elems[];
2686 } mdb_zfs_btree_core_t;
2687 
2688 typedef struct mdb_zfs_btree_leaf {
2689 	mdb_zfs_btree_hdr_t	btl_hdr;
2690 	uint8_t			btl_elems[];
2691 } mdb_zfs_btree_leaf_t;
2692 
2693 typedef struct mdb_zfs_btree {
2694 	uintptr_t		bt_root;
2695 	size_t			bt_elem_size;
2696 } mdb_zfs_btree_t;
2697 
2698 typedef struct btree_walk_data {
2699 	mdb_zfs_btree_t		bwd_btree;
2700 	mdb_zfs_btree_hdr_t	*bwd_node;
2701 	uint64_t		bwd_offset; // In units of bt_node_size
2702 } btree_walk_data_t;
2703 
2704 static uintptr_t
2705 btree_leftmost_child(uintptr_t addr, mdb_zfs_btree_hdr_t *buf)
2706 {
2707 	size_t size = offsetof(zfs_btree_core_t, btc_children) +
2708 	    sizeof (uintptr_t);
2709 	for (;;) {
2710 		if (mdb_vread(buf, size, addr) == -1) {
2711 			mdb_warn("failed to read at %p\n", addr);
2712 			return ((uintptr_t)0ULL);
2713 		}
2714 		if (!buf->bth_core)
2715 			return (addr);
2716 		mdb_zfs_btree_core_t *node = (mdb_zfs_btree_core_t *)buf;
2717 		addr = node->btc_children[0];
2718 	}
2719 }
2720 
2721 static int
2722 btree_walk_step(mdb_walk_state_t *wsp)
2723 {
2724 	btree_walk_data_t *bwd = wsp->walk_data;
2725 	size_t elem_size = bwd->bwd_btree.bt_elem_size;
2726 	if (wsp->walk_addr == 0ULL)
2727 		return (WALK_DONE);
2728 
2729 	if (!bwd->bwd_node->bth_core) {
2730 		/*
2731 		 * For the first element in a leaf node, read in the full
2732 		 * leaf, since we only had part of it read in before.
2733 		 */
2734 		if (bwd->bwd_offset == 0) {
2735 			if (mdb_vread(bwd->bwd_node, BTREE_LEAF_SIZE,
2736 			    wsp->walk_addr) == -1) {
2737 				mdb_warn("failed to read at %p\n",
2738 				    wsp->walk_addr);
2739 				return (WALK_ERR);
2740 			}
2741 		}
2742 
2743 		int status = wsp->walk_callback((uintptr_t)(wsp->walk_addr +
2744 		    offsetof(mdb_zfs_btree_leaf_t, btl_elems) +
2745 		    bwd->bwd_offset * elem_size), bwd->bwd_node,
2746 		    wsp->walk_cbdata);
2747 		if (status != WALK_NEXT)
2748 			return (status);
2749 		bwd->bwd_offset++;
2750 
2751 		/* Find the next element, if we're at the end of the leaf. */
2752 		while (bwd->bwd_offset == bwd->bwd_node->bth_count) {
2753 			uintptr_t par = bwd->bwd_node->bth_parent;
2754 			uintptr_t cur = wsp->walk_addr;
2755 			wsp->walk_addr = par;
2756 			if (par == 0ULL)
2757 				return (WALK_NEXT);
2758 
2759 			size_t size = sizeof (zfs_btree_core_t) +
2760 			    BTREE_CORE_ELEMS * elem_size;
2761 			if (mdb_vread(bwd->bwd_node, size, wsp->walk_addr) ==
2762 			    -1) {
2763 				mdb_warn("failed to read at %p\n",
2764 				    wsp->walk_addr);
2765 				return (WALK_ERR);
2766 			}
2767 			mdb_zfs_btree_core_t *node =
2768 			    (mdb_zfs_btree_core_t *)bwd->bwd_node;
2769 			int i;
2770 			for (i = 0; i <= bwd->bwd_node->bth_count; i++) {
2771 				if (node->btc_children[i] == cur)
2772 					break;
2773 			}
2774 			if (i > bwd->bwd_node->bth_count) {
2775 				mdb_warn("btree parent/child mismatch at "
2776 				    "%#lx\n", cur);
2777 				return (WALK_ERR);
2778 			}
2779 			bwd->bwd_offset = i;
2780 		}
2781 		return (WALK_NEXT);
2782 	}
2783 
2784 	if (!bwd->bwd_node->bth_core) {
2785 		mdb_warn("Invalid btree node at %#lx\n", wsp->walk_addr);
2786 		return (WALK_ERR);
2787 	}
2788 	mdb_zfs_btree_core_t *node = (mdb_zfs_btree_core_t *)bwd->bwd_node;
2789 	int status = wsp->walk_callback((uintptr_t)(wsp->walk_addr +
2790 	    offsetof(mdb_zfs_btree_core_t, btc_elems) + bwd->bwd_offset *
2791 	    elem_size), bwd->bwd_node, wsp->walk_cbdata);
2792 	if (status != WALK_NEXT)
2793 		return (status);
2794 
2795 	uintptr_t new_child = node->btc_children[bwd->bwd_offset + 1];
2796 	wsp->walk_addr = btree_leftmost_child(new_child, bwd->bwd_node);
2797 	if (wsp->walk_addr == 0ULL)
2798 		return (WALK_ERR);
2799 
2800 	bwd->bwd_offset = 0;
2801 	return (WALK_NEXT);
2802 }
2803 
2804 static int
2805 btree_walk_init(mdb_walk_state_t *wsp)
2806 {
2807 	btree_walk_data_t *bwd;
2808 
2809 	if (wsp->walk_addr == 0ULL) {
2810 		mdb_warn("must supply address of zfs_btree_t\n");
2811 		return (WALK_ERR);
2812 	}
2813 
2814 	bwd = mdb_zalloc(sizeof (btree_walk_data_t), UM_SLEEP);
2815 	if (mdb_ctf_vread(&bwd->bwd_btree, "zfs_btree_t", "mdb_zfs_btree_t",
2816 	    wsp->walk_addr, 0) == -1) {
2817 		mdb_free(bwd, sizeof (*bwd));
2818 		return (WALK_ERR);
2819 	}
2820 
2821 	if (bwd->bwd_btree.bt_elem_size == 0) {
2822 		mdb_warn("invalid or uninitialized btree at %#lx\n",
2823 		    wsp->walk_addr);
2824 		mdb_free(bwd, sizeof (*bwd));
2825 		return (WALK_ERR);
2826 	}
2827 
2828 	size_t size = MAX(BTREE_LEAF_SIZE, sizeof (zfs_btree_core_t) +
2829 	    BTREE_CORE_ELEMS * bwd->bwd_btree.bt_elem_size);
2830 	bwd->bwd_node = mdb_zalloc(size, UM_SLEEP);
2831 
2832 	uintptr_t node = (uintptr_t)bwd->bwd_btree.bt_root;
2833 	if (node == 0ULL) {
2834 		wsp->walk_addr = 0ULL;
2835 		wsp->walk_data = bwd;
2836 		return (WALK_NEXT);
2837 	}
2838 	node = btree_leftmost_child(node, bwd->bwd_node);
2839 	if (node == 0ULL) {
2840 		mdb_free(bwd->bwd_node, size);
2841 		mdb_free(bwd, sizeof (*bwd));
2842 		return (WALK_ERR);
2843 	}
2844 	bwd->bwd_offset = 0;
2845 
2846 	wsp->walk_addr = node;
2847 	wsp->walk_data = bwd;
2848 	return (WALK_NEXT);
2849 }
2850 
2851 static void
2852 btree_walk_fini(mdb_walk_state_t *wsp)
2853 {
2854 	btree_walk_data_t *bwd = (btree_walk_data_t *)wsp->walk_data;
2855 
2856 	if (bwd == NULL)
2857 		return;
2858 
2859 	size_t size = MAX(BTREE_LEAF_SIZE, sizeof (zfs_btree_core_t) +
2860 	    BTREE_CORE_ELEMS * bwd->bwd_btree.bt_elem_size);
2861 	if (bwd->bwd_node != NULL)
2862 		mdb_free(bwd->bwd_node, size);
2863 
2864 	mdb_free(bwd, sizeof (*bwd));
2865 }
2866 
2867 typedef struct mdb_multilist {
2868 	uint64_t ml_num_sublists;
2869 	uintptr_t ml_sublists;
2870 } mdb_multilist_t;
2871 
2872 typedef struct multilist_walk_data {
2873 	uint64_t mwd_idx;
2874 	mdb_multilist_t mwd_ml;
2875 } multilist_walk_data_t;
2876 
2877 /* ARGSUSED */
2878 static int
2879 multilist_print_cb(uintptr_t addr, const void *unknown, void *arg)
2880 {
2881 	mdb_printf("%#lr\n", addr);
2882 	return (WALK_NEXT);
2883 }
2884 
2885 static int
2886 multilist_walk_step(mdb_walk_state_t *wsp)
2887 {
2888 	multilist_walk_data_t *mwd = wsp->walk_data;
2889 
2890 	if (mwd->mwd_idx >= mwd->mwd_ml.ml_num_sublists)
2891 		return (WALK_DONE);
2892 
2893 	wsp->walk_addr = mwd->mwd_ml.ml_sublists +
2894 	    mdb_ctf_sizeof_by_name("multilist_sublist_t") * mwd->mwd_idx +
2895 	    mdb_ctf_offsetof_by_name("multilist_sublist_t", "mls_list");
2896 
2897 	mdb_pwalk("list", multilist_print_cb, (void*)NULL, wsp->walk_addr);
2898 	mwd->mwd_idx++;
2899 
2900 	return (WALK_NEXT);
2901 }
2902 
2903 static int
2904 multilist_walk_init(mdb_walk_state_t *wsp)
2905 {
2906 	multilist_walk_data_t *mwd;
2907 
2908 	if (wsp->walk_addr == 0) {
2909 		mdb_warn("must supply address of multilist_t\n");
2910 		return (WALK_ERR);
2911 	}
2912 
2913 	mwd = mdb_zalloc(sizeof (multilist_walk_data_t), UM_SLEEP | UM_GC);
2914 	if (mdb_ctf_vread(&mwd->mwd_ml, "multilist_t", "mdb_multilist_t",
2915 	    wsp->walk_addr, 0) == -1) {
2916 		return (WALK_ERR);
2917 	}
2918 
2919 	if (mwd->mwd_ml.ml_num_sublists == 0 ||
2920 	    mwd->mwd_ml.ml_sublists == 0) {
2921 		mdb_warn("invalid or uninitialized multilist at %#lx\n",
2922 		    wsp->walk_addr);
2923 		return (WALK_ERR);
2924 	}
2925 
2926 	wsp->walk_data = mwd;
2927 	return (WALK_NEXT);
2928 }
2929 
2930 typedef struct mdb_txg_list {
2931 	size_t		tl_offset;
2932 	uintptr_t	tl_head[TXG_SIZE];
2933 } mdb_txg_list_t;
2934 
2935 typedef struct txg_list_walk_data {
2936 	uintptr_t lw_head[TXG_SIZE];
2937 	int	lw_txgoff;
2938 	int	lw_maxoff;
2939 	size_t	lw_offset;
2940 	void	*lw_obj;
2941 } txg_list_walk_data_t;
2942 
2943 static int
2944 txg_list_walk_init_common(mdb_walk_state_t *wsp, int txg, int maxoff)
2945 {
2946 	txg_list_walk_data_t *lwd;
2947 	mdb_txg_list_t list;
2948 	int i;
2949 
2950 	lwd = mdb_alloc(sizeof (txg_list_walk_data_t), UM_SLEEP | UM_GC);
2951 	if (mdb_ctf_vread(&list, "txg_list_t", "mdb_txg_list_t", wsp->walk_addr,
2952 	    0) == -1) {
2953 		mdb_warn("failed to read txg_list_t at %#lx", wsp->walk_addr);
2954 		return (WALK_ERR);
2955 	}
2956 
2957 	for (i = 0; i < TXG_SIZE; i++)
2958 		lwd->lw_head[i] = list.tl_head[i];
2959 	lwd->lw_offset = list.tl_offset;
2960 	lwd->lw_obj = mdb_alloc(lwd->lw_offset + sizeof (txg_node_t),
2961 	    UM_SLEEP | UM_GC);
2962 	lwd->lw_txgoff = txg;
2963 	lwd->lw_maxoff = maxoff;
2964 
2965 	wsp->walk_addr = lwd->lw_head[lwd->lw_txgoff];
2966 	wsp->walk_data = lwd;
2967 
2968 	return (WALK_NEXT);
2969 }
2970 
2971 static int
2972 txg_list_walk_init(mdb_walk_state_t *wsp)
2973 {
2974 	return (txg_list_walk_init_common(wsp, 0, TXG_SIZE-1));
2975 }
2976 
2977 static int
2978 txg_list0_walk_init(mdb_walk_state_t *wsp)
2979 {
2980 	return (txg_list_walk_init_common(wsp, 0, 0));
2981 }
2982 
2983 static int
2984 txg_list1_walk_init(mdb_walk_state_t *wsp)
2985 {
2986 	return (txg_list_walk_init_common(wsp, 1, 1));
2987 }
2988 
2989 static int
2990 txg_list2_walk_init(mdb_walk_state_t *wsp)
2991 {
2992 	return (txg_list_walk_init_common(wsp, 2, 2));
2993 }
2994 
2995 static int
2996 txg_list3_walk_init(mdb_walk_state_t *wsp)
2997 {
2998 	return (txg_list_walk_init_common(wsp, 3, 3));
2999 }
3000 
3001 static int
3002 txg_list_walk_step(mdb_walk_state_t *wsp)
3003 {
3004 	txg_list_walk_data_t *lwd = wsp->walk_data;
3005 	uintptr_t addr;
3006 	txg_node_t *node;
3007 	int status;
3008 
3009 	while (wsp->walk_addr == 0 && lwd->lw_txgoff < lwd->lw_maxoff) {
3010 		lwd->lw_txgoff++;
3011 		wsp->walk_addr = lwd->lw_head[lwd->lw_txgoff];
3012 	}
3013 
3014 	if (wsp->walk_addr == 0)
3015 		return (WALK_DONE);
3016 
3017 	addr = wsp->walk_addr - lwd->lw_offset;
3018 
3019 	if (mdb_vread(lwd->lw_obj,
3020 	    lwd->lw_offset + sizeof (txg_node_t), addr) == -1) {
3021 		mdb_warn("failed to read list element at %#lx", addr);
3022 		return (WALK_ERR);
3023 	}
3024 
3025 	status = wsp->walk_callback(addr, lwd->lw_obj, wsp->walk_cbdata);
3026 	node = (txg_node_t *)((uintptr_t)lwd->lw_obj + lwd->lw_offset);
3027 	wsp->walk_addr = (uintptr_t)node->tn_next[lwd->lw_txgoff];
3028 
3029 	return (status);
3030 }
3031 
3032 /*
3033  * ::walk spa
3034  *
3035  * Walk all named spa_t structures in the namespace.  This is nothing more than
3036  * a layered avl walk.
3037  */
3038 static int
3039 spa_walk_init(mdb_walk_state_t *wsp)
3040 {
3041 	GElf_Sym sym;
3042 
3043 	if (wsp->walk_addr != 0) {
3044 		mdb_warn("spa walk only supports global walks\n");
3045 		return (WALK_ERR);
3046 	}
3047 
3048 	if (mdb_lookup_by_obj(ZFS_OBJ_NAME, "spa_namespace_avl", &sym) == -1) {
3049 		mdb_warn("failed to find symbol 'spa_namespace_avl'");
3050 		return (WALK_ERR);
3051 	}
3052 
3053 	wsp->walk_addr = (uintptr_t)sym.st_value;
3054 
3055 	if (mdb_layered_walk("avl", wsp) == -1) {
3056 		mdb_warn("failed to walk 'avl'\n");
3057 		return (WALK_ERR);
3058 	}
3059 
3060 	return (WALK_NEXT);
3061 }
3062 
3063 static int
3064 spa_walk_step(mdb_walk_state_t *wsp)
3065 {
3066 	return (wsp->walk_callback(wsp->walk_addr, NULL, wsp->walk_cbdata));
3067 }
3068 
3069 /*
3070  * [addr]::walk zio
3071  *
3072  * Walk all active zio_t structures on the system.  This is simply a layered
3073  * walk on top of ::walk zio_cache, with the optional ability to limit the
3074  * structures to a particular pool.
3075  */
3076 static int
3077 zio_walk_init(mdb_walk_state_t *wsp)
3078 {
3079 	wsp->walk_data = (void *)wsp->walk_addr;
3080 
3081 	if (mdb_layered_walk("zio_cache", wsp) == -1) {
3082 		mdb_warn("failed to walk 'zio_cache'\n");
3083 		return (WALK_ERR);
3084 	}
3085 
3086 	return (WALK_NEXT);
3087 }
3088 
3089 static int
3090 zio_walk_step(mdb_walk_state_t *wsp)
3091 {
3092 	mdb_zio_t zio;
3093 	uintptr_t spa = (uintptr_t)wsp->walk_data;
3094 
3095 	if (mdb_ctf_vread(&zio, ZFS_STRUCT "zio", "mdb_zio_t",
3096 	    wsp->walk_addr, 0) == -1)
3097 		return (WALK_ERR);
3098 
3099 	if (spa != 0 && spa != zio.io_spa)
3100 		return (WALK_NEXT);
3101 
3102 	return (wsp->walk_callback(wsp->walk_addr, &zio, wsp->walk_cbdata));
3103 }
3104 
3105 /*
3106  * [addr]::walk zio_root
3107  *
3108  * Walk only root zio_t structures, optionally for a particular spa_t.
3109  */
3110 static int
3111 zio_walk_root_step(mdb_walk_state_t *wsp)
3112 {
3113 	mdb_zio_t zio;
3114 	uintptr_t spa = (uintptr_t)wsp->walk_data;
3115 
3116 	if (mdb_ctf_vread(&zio, ZFS_STRUCT "zio", "mdb_zio_t",
3117 	    wsp->walk_addr, 0) == -1)
3118 		return (WALK_ERR);
3119 
3120 	if (spa != 0 && spa != zio.io_spa)
3121 		return (WALK_NEXT);
3122 
3123 	/* If the parent list is not empty, ignore */
3124 	if (zio.io_parent_list.list_head.list_next !=
3125 	    wsp->walk_addr +
3126 	    mdb_ctf_offsetof_by_name(ZFS_STRUCT "zio", "io_parent_list") +
3127 	    mdb_ctf_offsetof_by_name("struct list", "list_head"))
3128 		return (WALK_NEXT);
3129 
3130 	return (wsp->walk_callback(wsp->walk_addr, &zio, wsp->walk_cbdata));
3131 }
3132 
3133 /*
3134  * ::zfs_blkstats
3135  *
3136  *	-v	print verbose per-level information
3137  *
3138  */
3139 static int
3140 zfs_blkstats(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
3141 {
3142 	boolean_t verbose = B_FALSE;
3143 	zfs_all_blkstats_t stats;
3144 	dmu_object_type_t t;
3145 	zfs_blkstat_t *tzb;
3146 	uint64_t ditto;
3147 
3148 	if (mdb_getopts(argc, argv,
3149 	    'v', MDB_OPT_SETBITS, TRUE, &verbose,
3150 	    NULL) != argc)
3151 		return (DCMD_USAGE);
3152 
3153 	if (!(flags & DCMD_ADDRSPEC))
3154 		return (DCMD_USAGE);
3155 
3156 	if (GETMEMB(addr, "spa", spa_dsl_pool, addr) ||
3157 	    GETMEMB(addr, "dsl_pool", dp_blkstats, addr) ||
3158 	    mdb_vread(&stats, sizeof (zfs_all_blkstats_t), addr) == -1) {
3159 		mdb_warn("failed to read data at %p;", addr);
3160 		mdb_printf("maybe no stats? run \"zpool scrub\" first.");
3161 		return (DCMD_ERR);
3162 	}
3163 
3164 	tzb = &stats.zab_type[DN_MAX_LEVELS][DMU_OT_TOTAL];
3165 	if (tzb->zb_gangs != 0) {
3166 		mdb_printf("Ganged blocks: %llu\n",
3167 		    (longlong_t)tzb->zb_gangs);
3168 	}
3169 
3170 	ditto = tzb->zb_ditto_2_of_2_samevdev + tzb->zb_ditto_2_of_3_samevdev +
3171 	    tzb->zb_ditto_3_of_3_samevdev;
3172 	if (ditto != 0) {
3173 		mdb_printf("Dittoed blocks on same vdev: %llu\n",
3174 		    (longlong_t)ditto);
3175 	}
3176 
3177 	mdb_printf("\nBlocks\tLSIZE\tPSIZE\tASIZE"
3178 	    "\t  avg\t comp\t%%Total\tType\n");
3179 
3180 	for (t = 0; t <= DMU_OT_TOTAL; t++) {
3181 		char csize[MDB_NICENUM_BUFLEN], lsize[MDB_NICENUM_BUFLEN];
3182 		char psize[MDB_NICENUM_BUFLEN], asize[MDB_NICENUM_BUFLEN];
3183 		char avg[MDB_NICENUM_BUFLEN];
3184 		char comp[MDB_NICENUM_BUFLEN], pct[MDB_NICENUM_BUFLEN];
3185 		char typename[64];
3186 		int l;
3187 
3188 
3189 		if (t == DMU_OT_DEFERRED)
3190 			strcpy(typename, "deferred free");
3191 		else if (t == DMU_OT_OTHER)
3192 			strcpy(typename, "other");
3193 		else if (t == DMU_OT_TOTAL)
3194 			strcpy(typename, "Total");
3195 		else if (enum_lookup("enum dmu_object_type",
3196 		    t, "DMU_OT_", sizeof (typename), typename) == -1) {
3197 			mdb_warn("failed to read type name");
3198 			return (DCMD_ERR);
3199 		}
3200 
3201 		if (stats.zab_type[DN_MAX_LEVELS][t].zb_asize == 0)
3202 			continue;
3203 
3204 		for (l = -1; l < DN_MAX_LEVELS; l++) {
3205 			int level = (l == -1 ? DN_MAX_LEVELS : l);
3206 			zfs_blkstat_t *zb = &stats.zab_type[level][t];
3207 
3208 			if (zb->zb_asize == 0)
3209 				continue;
3210 
3211 			/*
3212 			 * Don't print each level unless requested.
3213 			 */
3214 			if (!verbose && level != DN_MAX_LEVELS)
3215 				continue;
3216 
3217 			/*
3218 			 * If all the space is level 0, don't print the
3219 			 * level 0 separately.
3220 			 */
3221 			if (level == 0 && zb->zb_asize ==
3222 			    stats.zab_type[DN_MAX_LEVELS][t].zb_asize)
3223 				continue;
3224 
3225 			mdb_nicenum(zb->zb_count, csize);
3226 			mdb_nicenum(zb->zb_lsize, lsize);
3227 			mdb_nicenum(zb->zb_psize, psize);
3228 			mdb_nicenum(zb->zb_asize, asize);
3229 			mdb_nicenum(zb->zb_asize / zb->zb_count, avg);
3230 			(void) mdb_snprintfrac(comp, MDB_NICENUM_BUFLEN,
3231 			    zb->zb_lsize, zb->zb_psize, 2);
3232 			(void) mdb_snprintfrac(pct, MDB_NICENUM_BUFLEN,
3233 			    100 * zb->zb_asize, tzb->zb_asize, 2);
3234 
3235 			mdb_printf("%6s\t%5s\t%5s\t%5s\t%5s"
3236 			    "\t%5s\t%6s\t",
3237 			    csize, lsize, psize, asize, avg, comp, pct);
3238 
3239 			if (level == DN_MAX_LEVELS)
3240 				mdb_printf("%s\n", typename);
3241 			else
3242 				mdb_printf("  L%d %s\n",
3243 				    level, typename);
3244 		}
3245 	}
3246 
3247 	return (DCMD_OK);
3248 }
3249 
3250 typedef struct mdb_reference {
3251 	uintptr_t ref_holder;
3252 	uintptr_t ref_removed;
3253 	uint64_t ref_number;
3254 } mdb_reference_t;
3255 
3256 /* ARGSUSED */
3257 static int
3258 reference_cb(uintptr_t addr, const void *ignored, void *arg)
3259 {
3260 	mdb_reference_t ref;
3261 	boolean_t holder_is_str = B_FALSE;
3262 	char holder_str[128];
3263 	boolean_t removed = (boolean_t)arg;
3264 
3265 	if (mdb_ctf_vread(&ref, "reference_t", "mdb_reference_t", addr,
3266 	    0) == -1)
3267 		return (DCMD_ERR);
3268 
3269 	if (mdb_readstr(holder_str, sizeof (holder_str),
3270 	    ref.ref_holder) != -1)
3271 		holder_is_str = strisprint(holder_str);
3272 
3273 	if (removed)
3274 		mdb_printf("removed ");
3275 	mdb_printf("reference ");
3276 	if (ref.ref_number != 1)
3277 		mdb_printf("with count=%llu ", ref.ref_number);
3278 	mdb_printf("with tag %lx", ref.ref_holder);
3279 	if (holder_is_str)
3280 		mdb_printf(" \"%s\"", holder_str);
3281 	mdb_printf(", held at:\n");
3282 
3283 	(void) mdb_call_dcmd("whatis", addr, DCMD_ADDRSPEC, 0, NULL);
3284 
3285 	if (removed) {
3286 		mdb_printf("removed at:\n");
3287 		(void) mdb_call_dcmd("whatis", ref.ref_removed,
3288 		    DCMD_ADDRSPEC, 0, NULL);
3289 	}
3290 
3291 	mdb_printf("\n");
3292 
3293 	return (WALK_NEXT);
3294 }
3295 
3296 typedef struct mdb_zfs_refcount {
3297 	uint64_t rc_count;
3298 } mdb_zfs_refcount_t;
3299 
3300 typedef struct mdb_zfs_refcount_removed {
3301 	uint64_t rc_removed_count;
3302 } mdb_zfs_refcount_removed_t;
3303 
3304 typedef struct mdb_zfs_refcount_tracked {
3305 	boolean_t rc_tracked;
3306 } mdb_zfs_refcount_tracked_t;
3307 
3308 /* ARGSUSED */
3309 static int
3310 zfs_refcount(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
3311 {
3312 	mdb_zfs_refcount_t rc;
3313 	mdb_zfs_refcount_removed_t rcr;
3314 	mdb_zfs_refcount_tracked_t rct;
3315 	int off;
3316 	boolean_t released = B_FALSE;
3317 
3318 	if (!(flags & DCMD_ADDRSPEC))
3319 		return (DCMD_USAGE);
3320 
3321 	if (mdb_getopts(argc, argv,
3322 	    'r', MDB_OPT_SETBITS, B_TRUE, &released,
3323 	    NULL) != argc)
3324 		return (DCMD_USAGE);
3325 
3326 	if (mdb_ctf_vread(&rc, "zfs_refcount_t", "mdb_zfs_refcount_t", addr,
3327 	    0) == -1)
3328 		return (DCMD_ERR);
3329 
3330 	if (mdb_ctf_vread(&rcr, "zfs_refcount_t", "mdb_zfs_refcount_removed_t",
3331 	    addr, MDB_CTF_VREAD_QUIET) == -1) {
3332 		mdb_printf("zfs_refcount_t at %p has %llu holds (untracked)\n",
3333 		    addr, (longlong_t)rc.rc_count);
3334 		return (DCMD_OK);
3335 	}
3336 
3337 	if (mdb_ctf_vread(&rct, "zfs_refcount_t", "mdb_zfs_refcount_tracked_t",
3338 	    addr, MDB_CTF_VREAD_QUIET) == -1) {
3339 		/* If this is an old target, it might be tracked. */
3340 		rct.rc_tracked = B_TRUE;
3341 	}
3342 
3343 	mdb_printf("zfs_refcount_t at %p has %llu current holds, "
3344 	    "%llu recently released holds\n",
3345 	    addr, (longlong_t)rc.rc_count, (longlong_t)rcr.rc_removed_count);
3346 
3347 	if (rct.rc_tracked && rc.rc_count > 0)
3348 		mdb_printf("current holds:\n");
3349 	off = mdb_ctf_offsetof_by_name("zfs_refcount_t", "rc_list");
3350 	if (off == -1)
3351 		return (DCMD_ERR);
3352 	mdb_pwalk("list", reference_cb, (void*)B_FALSE, addr + off);
3353 
3354 	if (released && rcr.rc_removed_count > 0) {
3355 		mdb_printf("released holds:\n");
3356 
3357 		off = mdb_ctf_offsetof_by_name("zfs_refcount_t", "rc_removed");
3358 		if (off == -1)
3359 			return (DCMD_ERR);
3360 		mdb_pwalk("list", reference_cb, (void*)B_TRUE, addr + off);
3361 	}
3362 
3363 	return (DCMD_OK);
3364 }
3365 
3366 /* ARGSUSED */
3367 static int
3368 sa_attr_table(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
3369 {
3370 	sa_attr_table_t *table;
3371 	sa_os_t sa_os;
3372 	char *name;
3373 	int i;
3374 
3375 	if (mdb_vread(&sa_os, sizeof (sa_os_t), addr) == -1) {
3376 		mdb_warn("failed to read sa_os at %p", addr);
3377 		return (DCMD_ERR);
3378 	}
3379 
3380 	table = mdb_alloc(sizeof (sa_attr_table_t) * sa_os.sa_num_attrs,
3381 	    UM_SLEEP | UM_GC);
3382 	name = mdb_alloc(MAXPATHLEN, UM_SLEEP | UM_GC);
3383 
3384 	if (mdb_vread(table, sizeof (sa_attr_table_t) * sa_os.sa_num_attrs,
3385 	    (uintptr_t)sa_os.sa_attr_table) == -1) {
3386 		mdb_warn("failed to read sa_os at %p", addr);
3387 		return (DCMD_ERR);
3388 	}
3389 
3390 	mdb_printf("%<u>%-10s %-10s %-10s %-10s %s%</u>\n",
3391 	    "ATTR ID", "REGISTERED", "LENGTH", "BSWAP", "NAME");
3392 	for (i = 0; i != sa_os.sa_num_attrs; i++) {
3393 		mdb_readstr(name, MAXPATHLEN, (uintptr_t)table[i].sa_name);
3394 		mdb_printf("%5x   %8x %8x %8x          %-s\n",
3395 		    (int)table[i].sa_attr, (int)table[i].sa_registered,
3396 		    (int)table[i].sa_length, table[i].sa_byteswap, name);
3397 	}
3398 
3399 	return (DCMD_OK);
3400 }
3401 
3402 static int
3403 sa_get_off_table(uintptr_t addr, uint32_t **off_tab, int attr_count)
3404 {
3405 	uintptr_t idx_table;
3406 
3407 	if (GETMEMB(addr, "sa_idx_tab", sa_idx_tab, idx_table)) {
3408 		mdb_printf("can't find offset table in sa_idx_tab\n");
3409 		return (-1);
3410 	}
3411 
3412 	*off_tab = mdb_alloc(attr_count * sizeof (uint32_t),
3413 	    UM_SLEEP | UM_GC);
3414 
3415 	if (mdb_vread(*off_tab,
3416 	    attr_count * sizeof (uint32_t), idx_table) == -1) {
3417 		mdb_warn("failed to attribute offset table %p", idx_table);
3418 		return (-1);
3419 	}
3420 
3421 	return (DCMD_OK);
3422 }
3423 
3424 /*ARGSUSED*/
3425 static int
3426 sa_attr_print(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
3427 {
3428 	uint32_t *offset_tab;
3429 	int attr_count;
3430 	uint64_t attr_id;
3431 	uintptr_t attr_addr;
3432 	uintptr_t bonus_tab, spill_tab;
3433 	uintptr_t db_bonus, db_spill;
3434 	uintptr_t os, os_sa;
3435 	uintptr_t db_data;
3436 
3437 	if (argc != 1)
3438 		return (DCMD_USAGE);
3439 
3440 	if (argv[0].a_type == MDB_TYPE_STRING)
3441 		attr_id = mdb_strtoull(argv[0].a_un.a_str);
3442 	else
3443 		return (DCMD_USAGE);
3444 
3445 	if (GETMEMB(addr, "sa_handle", sa_bonus_tab, bonus_tab) ||
3446 	    GETMEMB(addr, "sa_handle", sa_spill_tab, spill_tab) ||
3447 	    GETMEMB(addr, "sa_handle", sa_os, os) ||
3448 	    GETMEMB(addr, "sa_handle", sa_bonus, db_bonus) ||
3449 	    GETMEMB(addr, "sa_handle", sa_spill, db_spill)) {
3450 		mdb_printf("Can't find necessary information in sa_handle "
3451 		    "in sa_handle\n");
3452 		return (DCMD_ERR);
3453 	}
3454 
3455 	if (GETMEMB(os, "objset", os_sa, os_sa)) {
3456 		mdb_printf("Can't find os_sa in objset\n");
3457 		return (DCMD_ERR);
3458 	}
3459 
3460 	if (GETMEMB(os_sa, "sa_os", sa_num_attrs, attr_count)) {
3461 		mdb_printf("Can't find sa_num_attrs\n");
3462 		return (DCMD_ERR);
3463 	}
3464 
3465 	if (attr_id > attr_count) {
3466 		mdb_printf("attribute id number is out of range\n");
3467 		return (DCMD_ERR);
3468 	}
3469 
3470 	if (bonus_tab) {
3471 		if (sa_get_off_table(bonus_tab, &offset_tab,
3472 		    attr_count) == -1) {
3473 			return (DCMD_ERR);
3474 		}
3475 
3476 		if (GETMEMB(db_bonus, "dmu_buf", db_data, db_data)) {
3477 			mdb_printf("can't find db_data in bonus dbuf\n");
3478 			return (DCMD_ERR);
3479 		}
3480 	}
3481 
3482 	if (bonus_tab && !TOC_ATTR_PRESENT(offset_tab[attr_id]) &&
3483 	    spill_tab == 0) {
3484 		mdb_printf("Attribute does not exist\n");
3485 		return (DCMD_ERR);
3486 	} else if (!TOC_ATTR_PRESENT(offset_tab[attr_id]) && spill_tab) {
3487 		if (sa_get_off_table(spill_tab, &offset_tab,
3488 		    attr_count) == -1) {
3489 			return (DCMD_ERR);
3490 		}
3491 		if (GETMEMB(db_spill, "dmu_buf", db_data, db_data)) {
3492 			mdb_printf("can't find db_data in spill dbuf\n");
3493 			return (DCMD_ERR);
3494 		}
3495 		if (!TOC_ATTR_PRESENT(offset_tab[attr_id])) {
3496 			mdb_printf("Attribute does not exist\n");
3497 			return (DCMD_ERR);
3498 		}
3499 	}
3500 	attr_addr = db_data + TOC_OFF(offset_tab[attr_id]);
3501 	mdb_printf("%p\n", attr_addr);
3502 	return (DCMD_OK);
3503 }
3504 
3505 /* ARGSUSED */
3506 static int
3507 zfs_ace_print_common(uintptr_t addr, uint_t flags,
3508     uint64_t id, uint32_t access_mask, uint16_t ace_flags,
3509     uint16_t ace_type, int verbose)
3510 {
3511 	if (DCMD_HDRSPEC(flags) && !verbose)
3512 		mdb_printf("%<u>%-?s %-8s %-8s %-8s %s%</u>\n",
3513 		    "ADDR", "FLAGS", "MASK", "TYPE", "ID");
3514 
3515 	if (!verbose) {
3516 		mdb_printf("%0?p %-8x %-8x %-8x %-llx\n", addr,
3517 		    ace_flags, access_mask, ace_type, id);
3518 		return (DCMD_OK);
3519 	}
3520 
3521 	switch (ace_flags & ACE_TYPE_FLAGS) {
3522 	case ACE_OWNER:
3523 		mdb_printf("owner@:");
3524 		break;
3525 	case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
3526 		mdb_printf("group@:");
3527 		break;
3528 	case ACE_EVERYONE:
3529 		mdb_printf("everyone@:");
3530 		break;
3531 	case ACE_IDENTIFIER_GROUP:
3532 		mdb_printf("group:%llx:", (u_longlong_t)id);
3533 		break;
3534 	case 0: /* User entry */
3535 		mdb_printf("user:%llx:", (u_longlong_t)id);
3536 		break;
3537 	}
3538 
3539 	/* print out permission mask */
3540 	if (access_mask & ACE_READ_DATA)
3541 		mdb_printf("r");
3542 	else
3543 		mdb_printf("-");
3544 	if (access_mask & ACE_WRITE_DATA)
3545 		mdb_printf("w");
3546 	else
3547 		mdb_printf("-");
3548 	if (access_mask & ACE_EXECUTE)
3549 		mdb_printf("x");
3550 	else
3551 		mdb_printf("-");
3552 	if (access_mask & ACE_APPEND_DATA)
3553 		mdb_printf("p");
3554 	else
3555 		mdb_printf("-");
3556 	if (access_mask & ACE_DELETE)
3557 		mdb_printf("d");
3558 	else
3559 		mdb_printf("-");
3560 	if (access_mask & ACE_DELETE_CHILD)
3561 		mdb_printf("D");
3562 	else
3563 		mdb_printf("-");
3564 	if (access_mask & ACE_READ_ATTRIBUTES)
3565 		mdb_printf("a");
3566 	else
3567 		mdb_printf("-");
3568 	if (access_mask & ACE_WRITE_ATTRIBUTES)
3569 		mdb_printf("A");
3570 	else
3571 		mdb_printf("-");
3572 	if (access_mask & ACE_READ_NAMED_ATTRS)
3573 		mdb_printf("R");
3574 	else
3575 		mdb_printf("-");
3576 	if (access_mask & ACE_WRITE_NAMED_ATTRS)
3577 		mdb_printf("W");
3578 	else
3579 		mdb_printf("-");
3580 	if (access_mask & ACE_READ_ACL)
3581 		mdb_printf("c");
3582 	else
3583 		mdb_printf("-");
3584 	if (access_mask & ACE_WRITE_ACL)
3585 		mdb_printf("C");
3586 	else
3587 		mdb_printf("-");
3588 	if (access_mask & ACE_WRITE_OWNER)
3589 		mdb_printf("o");
3590 	else
3591 		mdb_printf("-");
3592 	if (access_mask & ACE_SYNCHRONIZE)
3593 		mdb_printf("s");
3594 	else
3595 		mdb_printf("-");
3596 
3597 	mdb_printf(":");
3598 
3599 	/* Print out inheritance flags */
3600 	if (ace_flags & ACE_FILE_INHERIT_ACE)
3601 		mdb_printf("f");
3602 	else
3603 		mdb_printf("-");
3604 	if (ace_flags & ACE_DIRECTORY_INHERIT_ACE)
3605 		mdb_printf("d");
3606 	else
3607 		mdb_printf("-");
3608 	if (ace_flags & ACE_INHERIT_ONLY_ACE)
3609 		mdb_printf("i");
3610 	else
3611 		mdb_printf("-");
3612 	if (ace_flags & ACE_NO_PROPAGATE_INHERIT_ACE)
3613 		mdb_printf("n");
3614 	else
3615 		mdb_printf("-");
3616 	if (ace_flags & ACE_SUCCESSFUL_ACCESS_ACE_FLAG)
3617 		mdb_printf("S");
3618 	else
3619 		mdb_printf("-");
3620 	if (ace_flags & ACE_FAILED_ACCESS_ACE_FLAG)
3621 		mdb_printf("F");
3622 	else
3623 		mdb_printf("-");
3624 	if (ace_flags & ACE_INHERITED_ACE)
3625 		mdb_printf("I");
3626 	else
3627 		mdb_printf("-");
3628 
3629 	switch (ace_type) {
3630 	case ACE_ACCESS_ALLOWED_ACE_TYPE:
3631 		mdb_printf(":allow\n");
3632 		break;
3633 	case ACE_ACCESS_DENIED_ACE_TYPE:
3634 		mdb_printf(":deny\n");
3635 		break;
3636 	case ACE_SYSTEM_AUDIT_ACE_TYPE:
3637 		mdb_printf(":audit\n");
3638 		break;
3639 	case ACE_SYSTEM_ALARM_ACE_TYPE:
3640 		mdb_printf(":alarm\n");
3641 		break;
3642 	default:
3643 		mdb_printf(":?\n");
3644 	}
3645 	return (DCMD_OK);
3646 }
3647 
3648 /* ARGSUSED */
3649 static int
3650 zfs_ace_print(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
3651 {
3652 	zfs_ace_t zace;
3653 	int verbose = FALSE;
3654 	uint64_t id;
3655 
3656 	if (!(flags & DCMD_ADDRSPEC))
3657 		return (DCMD_USAGE);
3658 
3659 	if (mdb_getopts(argc, argv,
3660 	    'v', MDB_OPT_SETBITS, TRUE, &verbose, TRUE, NULL) != argc)
3661 		return (DCMD_USAGE);
3662 
3663 	if (mdb_vread(&zace, sizeof (zfs_ace_t), addr) == -1) {
3664 		mdb_warn("failed to read zfs_ace_t");
3665 		return (DCMD_ERR);
3666 	}
3667 
3668 	if ((zace.z_hdr.z_flags & ACE_TYPE_FLAGS) == 0 ||
3669 	    (zace.z_hdr.z_flags & ACE_TYPE_FLAGS) == ACE_IDENTIFIER_GROUP)
3670 		id = zace.z_fuid;
3671 	else
3672 		id = -1;
3673 
3674 	return (zfs_ace_print_common(addr, flags, id, zace.z_hdr.z_access_mask,
3675 	    zace.z_hdr.z_flags, zace.z_hdr.z_type, verbose));
3676 }
3677 
3678 /* ARGSUSED */
3679 static int
3680 zfs_ace0_print(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
3681 {
3682 	ace_t ace;
3683 	uint64_t id;
3684 	int verbose = FALSE;
3685 
3686 	if (!(flags & DCMD_ADDRSPEC))
3687 		return (DCMD_USAGE);
3688 
3689 	if (mdb_getopts(argc, argv,
3690 	    'v', MDB_OPT_SETBITS, TRUE, &verbose, TRUE, NULL) != argc)
3691 		return (DCMD_USAGE);
3692 
3693 	if (mdb_vread(&ace, sizeof (ace_t), addr) == -1) {
3694 		mdb_warn("failed to read ace_t");
3695 		return (DCMD_ERR);
3696 	}
3697 
3698 	if ((ace.a_flags & ACE_TYPE_FLAGS) == 0 ||
3699 	    (ace.a_flags & ACE_TYPE_FLAGS) == ACE_IDENTIFIER_GROUP)
3700 		id = ace.a_who;
3701 	else
3702 		id = -1;
3703 
3704 	return (zfs_ace_print_common(addr, flags, id, ace.a_access_mask,
3705 	    ace.a_flags, ace.a_type, verbose));
3706 }
3707 
3708 typedef struct acl_dump_args {
3709 	int a_argc;
3710 	const mdb_arg_t *a_argv;
3711 	uint16_t a_version;
3712 	int a_flags;
3713 } acl_dump_args_t;
3714 
3715 /* ARGSUSED */
3716 static int
3717 acl_aces_cb(uintptr_t addr, const void *unknown, void *arg)
3718 {
3719 	acl_dump_args_t *acl_args = (acl_dump_args_t *)arg;
3720 
3721 	if (acl_args->a_version == 1) {
3722 		if (mdb_call_dcmd("zfs_ace", addr,
3723 		    DCMD_ADDRSPEC|acl_args->a_flags, acl_args->a_argc,
3724 		    acl_args->a_argv) != DCMD_OK) {
3725 			return (WALK_ERR);
3726 		}
3727 	} else {
3728 		if (mdb_call_dcmd("zfs_ace0", addr,
3729 		    DCMD_ADDRSPEC|acl_args->a_flags, acl_args->a_argc,
3730 		    acl_args->a_argv) != DCMD_OK) {
3731 			return (WALK_ERR);
3732 		}
3733 	}
3734 	acl_args->a_flags = DCMD_LOOP;
3735 	return (WALK_NEXT);
3736 }
3737 
3738 /* ARGSUSED */
3739 static int
3740 acl_cb(uintptr_t addr, const void *unknown, void *arg)
3741 {
3742 	acl_dump_args_t *acl_args = (acl_dump_args_t *)arg;
3743 
3744 	if (acl_args->a_version == 1) {
3745 		if (mdb_pwalk("zfs_acl_node_aces", acl_aces_cb,
3746 		    arg, addr) != 0) {
3747 			mdb_warn("can't walk ACEs");
3748 			return (DCMD_ERR);
3749 		}
3750 	} else {
3751 		if (mdb_pwalk("zfs_acl_node_aces0", acl_aces_cb,
3752 		    arg, addr) != 0) {
3753 			mdb_warn("can't walk ACEs");
3754 			return (DCMD_ERR);
3755 		}
3756 	}
3757 	return (WALK_NEXT);
3758 }
3759 
3760 /* ARGSUSED */
3761 static int
3762 zfs_acl_dump(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
3763 {
3764 	zfs_acl_t zacl;
3765 	int verbose = FALSE;
3766 	acl_dump_args_t acl_args;
3767 
3768 	if (!(flags & DCMD_ADDRSPEC))
3769 		return (DCMD_USAGE);
3770 
3771 	if (mdb_getopts(argc, argv,
3772 	    'v', MDB_OPT_SETBITS, TRUE, &verbose, NULL) != argc)
3773 		return (DCMD_USAGE);
3774 
3775 	if (mdb_vread(&zacl, sizeof (zfs_acl_t), addr) == -1) {
3776 		mdb_warn("failed to read zfs_acl_t");
3777 		return (DCMD_ERR);
3778 	}
3779 
3780 	acl_args.a_argc = argc;
3781 	acl_args.a_argv = argv;
3782 	acl_args.a_version = zacl.z_version;
3783 	acl_args.a_flags = DCMD_LOOPFIRST;
3784 
3785 	if (mdb_pwalk("zfs_acl_node", acl_cb, &acl_args, addr) != 0) {
3786 		mdb_warn("can't walk ACL");
3787 		return (DCMD_ERR);
3788 	}
3789 
3790 	return (DCMD_OK);
3791 }
3792 
3793 /* ARGSUSED */
3794 static int
3795 zfs_acl_node_walk_init(mdb_walk_state_t *wsp)
3796 {
3797 	if (wsp->walk_addr == 0) {
3798 		mdb_warn("must supply address of zfs_acl_node_t\n");
3799 		return (WALK_ERR);
3800 	}
3801 
3802 	wsp->walk_addr +=
3803 	    mdb_ctf_offsetof_by_name(ZFS_STRUCT "zfs_acl", "z_acl");
3804 
3805 	if (mdb_layered_walk("list", wsp) == -1) {
3806 		mdb_warn("failed to walk 'list'\n");
3807 		return (WALK_ERR);
3808 	}
3809 
3810 	return (WALK_NEXT);
3811 }
3812 
3813 static int
3814 zfs_acl_node_walk_step(mdb_walk_state_t *wsp)
3815 {
3816 	zfs_acl_node_t	aclnode;
3817 
3818 	if (mdb_vread(&aclnode, sizeof (zfs_acl_node_t),
3819 	    wsp->walk_addr) == -1) {
3820 		mdb_warn("failed to read zfs_acl_node at %p", wsp->walk_addr);
3821 		return (WALK_ERR);
3822 	}
3823 
3824 	return (wsp->walk_callback(wsp->walk_addr, &aclnode, wsp->walk_cbdata));
3825 }
3826 
3827 typedef struct ace_walk_data {
3828 	int		ace_count;
3829 	int		ace_version;
3830 } ace_walk_data_t;
3831 
3832 static int
3833 zfs_aces_walk_init_common(mdb_walk_state_t *wsp, int version,
3834     int ace_count, uintptr_t ace_data)
3835 {
3836 	ace_walk_data_t *ace_walk_data;
3837 
3838 	if (wsp->walk_addr == 0) {
3839 		mdb_warn("must supply address of zfs_acl_node_t\n");
3840 		return (WALK_ERR);
3841 	}
3842 
3843 	ace_walk_data = mdb_alloc(sizeof (ace_walk_data_t), UM_SLEEP | UM_GC);
3844 
3845 	ace_walk_data->ace_count = ace_count;
3846 	ace_walk_data->ace_version = version;
3847 
3848 	wsp->walk_addr = ace_data;
3849 	wsp->walk_data = ace_walk_data;
3850 
3851 	return (WALK_NEXT);
3852 }
3853 
3854 static int
3855 zfs_acl_node_aces_walk_init_common(mdb_walk_state_t *wsp, int version)
3856 {
3857 	static int gotid;
3858 	static mdb_ctf_id_t acl_id;
3859 	int z_ace_count;
3860 	uintptr_t z_acldata;
3861 
3862 	if (!gotid) {
3863 		if (mdb_ctf_lookup_by_name("struct zfs_acl_node",
3864 		    &acl_id) == -1) {
3865 			mdb_warn("couldn't find struct zfs_acl_node");
3866 			return (DCMD_ERR);
3867 		}
3868 		gotid = TRUE;
3869 	}
3870 
3871 	if (GETMEMBID(wsp->walk_addr, &acl_id, z_ace_count, z_ace_count)) {
3872 		return (DCMD_ERR);
3873 	}
3874 	if (GETMEMBID(wsp->walk_addr, &acl_id, z_acldata, z_acldata)) {
3875 		return (DCMD_ERR);
3876 	}
3877 
3878 	return (zfs_aces_walk_init_common(wsp, version,
3879 	    z_ace_count, z_acldata));
3880 }
3881 
3882 /* ARGSUSED */
3883 static int
3884 zfs_acl_node_aces_walk_init(mdb_walk_state_t *wsp)
3885 {
3886 	return (zfs_acl_node_aces_walk_init_common(wsp, 1));
3887 }
3888 
3889 /* ARGSUSED */
3890 static int
3891 zfs_acl_node_aces0_walk_init(mdb_walk_state_t *wsp)
3892 {
3893 	return (zfs_acl_node_aces_walk_init_common(wsp, 0));
3894 }
3895 
3896 static int
3897 zfs_aces_walk_step(mdb_walk_state_t *wsp)
3898 {
3899 	ace_walk_data_t *ace_data = wsp->walk_data;
3900 	zfs_ace_t zace;
3901 	ace_t *acep;
3902 	int status;
3903 	int entry_type;
3904 	int allow_type;
3905 	uintptr_t ptr;
3906 
3907 	if (ace_data->ace_count == 0)
3908 		return (WALK_DONE);
3909 
3910 	if (mdb_vread(&zace, sizeof (zfs_ace_t), wsp->walk_addr) == -1) {
3911 		mdb_warn("failed to read zfs_ace_t at %#lx",
3912 		    wsp->walk_addr);
3913 		return (WALK_ERR);
3914 	}
3915 
3916 	switch (ace_data->ace_version) {
3917 	case 0:
3918 		acep = (ace_t *)&zace;
3919 		entry_type = acep->a_flags & ACE_TYPE_FLAGS;
3920 		allow_type = acep->a_type;
3921 		break;
3922 	case 1:
3923 		entry_type = zace.z_hdr.z_flags & ACE_TYPE_FLAGS;
3924 		allow_type = zace.z_hdr.z_type;
3925 		break;
3926 	default:
3927 		return (WALK_ERR);
3928 	}
3929 
3930 	ptr = (uintptr_t)wsp->walk_addr;
3931 	switch (entry_type) {
3932 	case ACE_OWNER:
3933 	case ACE_EVERYONE:
3934 	case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
3935 		ptr += ace_data->ace_version == 0 ?
3936 		    sizeof (ace_t) : sizeof (zfs_ace_hdr_t);
3937 		break;
3938 	case ACE_IDENTIFIER_GROUP:
3939 	default:
3940 		switch (allow_type) {
3941 		case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
3942 		case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
3943 		case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
3944 		case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
3945 			ptr += ace_data->ace_version == 0 ?
3946 			    sizeof (ace_t) : sizeof (zfs_object_ace_t);
3947 			break;
3948 		default:
3949 			ptr += ace_data->ace_version == 0 ?
3950 			    sizeof (ace_t) : sizeof (zfs_ace_t);
3951 			break;
3952 		}
3953 	}
3954 
3955 	ace_data->ace_count--;
3956 	status = wsp->walk_callback(wsp->walk_addr,
3957 	    (void *)(uintptr_t)&zace, wsp->walk_cbdata);
3958 
3959 	wsp->walk_addr = ptr;
3960 	return (status);
3961 }
3962 
3963 typedef struct mdb_zfs_rrwlock {
3964 	uintptr_t	rr_writer;
3965 	boolean_t	rr_writer_wanted;
3966 } mdb_zfs_rrwlock_t;
3967 
3968 static uint_t rrw_key;
3969 
3970 /* ARGSUSED */
3971 static int
3972 rrwlock(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
3973 {
3974 	mdb_zfs_rrwlock_t rrw;
3975 
3976 	if (rrw_key == 0) {
3977 		if (mdb_ctf_readsym(&rrw_key, "uint_t", "rrw_tsd_key", 0) == -1)
3978 			return (DCMD_ERR);
3979 	}
3980 
3981 	if (mdb_ctf_vread(&rrw, "rrwlock_t", "mdb_zfs_rrwlock_t", addr,
3982 	    0) == -1)
3983 		return (DCMD_ERR);
3984 
3985 	if (rrw.rr_writer != 0) {
3986 		mdb_printf("write lock held by thread %lx\n", rrw.rr_writer);
3987 		return (DCMD_OK);
3988 	}
3989 
3990 	if (rrw.rr_writer_wanted) {
3991 		mdb_printf("writer wanted\n");
3992 	}
3993 
3994 	mdb_printf("anonymous references:\n");
3995 	(void) mdb_call_dcmd("zfs_refcount", addr +
3996 	    mdb_ctf_offsetof_by_name(ZFS_STRUCT "rrwlock", "rr_anon_rcount"),
3997 	    DCMD_ADDRSPEC, 0, NULL);
3998 
3999 	mdb_printf("linked references:\n");
4000 	(void) mdb_call_dcmd("zfs_refcount", addr +
4001 	    mdb_ctf_offsetof_by_name(ZFS_STRUCT "rrwlock", "rr_linked_rcount"),
4002 	    DCMD_ADDRSPEC, 0, NULL);
4003 
4004 	/*
4005 	 * XXX This should find references from
4006 	 * "::walk thread | ::tsd -v <rrw_key>", but there is no support
4007 	 * for programmatic consumption of dcmds, so this would be
4008 	 * difficult, potentially requiring reimplementing ::tsd (both
4009 	 * user and kernel versions) in this MDB module.
4010 	 */
4011 
4012 	return (DCMD_OK);
4013 }
4014 
4015 typedef struct mdb_arc_buf_hdr_t {
4016 	uint16_t b_psize;
4017 	uint16_t b_lsize;
4018 	struct {
4019 		uint32_t	b_bufcnt;
4020 		uintptr_t	b_state;
4021 	} b_l1hdr;
4022 } mdb_arc_buf_hdr_t;
4023 
4024 enum arc_cflags {
4025 	ARC_CFLAG_VERBOSE		= 1 << 0,
4026 	ARC_CFLAG_ANON			= 1 << 1,
4027 	ARC_CFLAG_MRU			= 1 << 2,
4028 	ARC_CFLAG_MFU			= 1 << 3,
4029 	ARC_CFLAG_BUFS			= 1 << 4,
4030 };
4031 
4032 typedef struct arc_compression_stats_data {
4033 	GElf_Sym anon_sym;	/* ARC_anon symbol */
4034 	GElf_Sym mru_sym;	/* ARC_mru symbol */
4035 	GElf_Sym mrug_sym;	/* ARC_mru_ghost symbol */
4036 	GElf_Sym mfu_sym;	/* ARC_mfu symbol */
4037 	GElf_Sym mfug_sym;	/* ARC_mfu_ghost symbol */
4038 	GElf_Sym l2c_sym;	/* ARC_l2c_only symbol */
4039 	uint64_t *anon_c_hist;	/* histogram of compressed sizes in anon */
4040 	uint64_t *anon_u_hist;	/* histogram of uncompressed sizes in anon */
4041 	uint64_t *anon_bufs;	/* histogram of buffer counts in anon state */
4042 	uint64_t *mru_c_hist;	/* histogram of compressed sizes in mru */
4043 	uint64_t *mru_u_hist;	/* histogram of uncompressed sizes in mru */
4044 	uint64_t *mru_bufs;	/* histogram of buffer counts in mru */
4045 	uint64_t *mfu_c_hist;	/* histogram of compressed sizes in mfu */
4046 	uint64_t *mfu_u_hist;	/* histogram of uncompressed sizes in mfu */
4047 	uint64_t *mfu_bufs;	/* histogram of buffer counts in mfu */
4048 	uint64_t *all_c_hist;	/* histogram of compressed anon + mru + mfu */
4049 	uint64_t *all_u_hist;	/* histogram of uncompressed anon + mru + mfu */
4050 	uint64_t *all_bufs;	/* histogram of buffer counts in all states  */
4051 	int arc_cflags;		/* arc compression flags, specified by user */
4052 	int hist_nbuckets;	/* number of buckets in each histogram */
4053 } arc_compression_stats_data_t;
4054 
4055 int
4056 highbit64(uint64_t i)
4057 {
4058 	int h = 1;
4059 
4060 	if (i == 0)
4061 		return (0);
4062 	if (i & 0xffffffff00000000ULL) {
4063 		h += 32; i >>= 32;
4064 	}
4065 	if (i & 0xffff0000) {
4066 		h += 16; i >>= 16;
4067 	}
4068 	if (i & 0xff00) {
4069 		h += 8; i >>= 8;
4070 	}
4071 	if (i & 0xf0) {
4072 		h += 4; i >>= 4;
4073 	}
4074 	if (i & 0xc) {
4075 		h += 2; i >>= 2;
4076 	}
4077 	if (i & 0x2) {
4078 		h += 1;
4079 	}
4080 	return (h);
4081 }
4082 
4083 /* ARGSUSED */
4084 static int
4085 arc_compression_stats_cb(uintptr_t addr, const void *unknown, void *arg)
4086 {
4087 	arc_compression_stats_data_t *data = arg;
4088 	mdb_arc_buf_hdr_t hdr;
4089 	int cbucket, ubucket, bufcnt;
4090 
4091 	if (mdb_ctf_vread(&hdr, "arc_buf_hdr_t", "mdb_arc_buf_hdr_t",
4092 	    addr, 0) == -1) {
4093 		return (WALK_ERR);
4094 	}
4095 
4096 	/*
4097 	 * Headers in the ghost states, or the l2c_only state don't have
4098 	 * arc buffers linked off of them. Thus, their compressed size
4099 	 * is meaningless, so we skip these from the stats.
4100 	 */
4101 	if (hdr.b_l1hdr.b_state == data->mrug_sym.st_value ||
4102 	    hdr.b_l1hdr.b_state == data->mfug_sym.st_value ||
4103 	    hdr.b_l1hdr.b_state == data->l2c_sym.st_value) {
4104 		return (WALK_NEXT);
4105 	}
4106 
4107 	/*
4108 	 * The physical size (compressed) and logical size
4109 	 * (uncompressed) are in units of SPA_MINBLOCKSIZE. By default,
4110 	 * we use the log2 of this value (rounded down to the nearest
4111 	 * integer) to determine the bucket to assign this header to.
4112 	 * Thus, the histogram is logarithmic with respect to the size
4113 	 * of the header. For example, the following is a mapping of the
4114 	 * bucket numbers and the range of header sizes they correspond to:
4115 	 *
4116 	 *	0: 0 byte headers
4117 	 *	1: 512 byte headers
4118 	 *	2: [1024 - 2048) byte headers
4119 	 *	3: [2048 - 4096) byte headers
4120 	 *	4: [4096 - 8192) byte headers
4121 	 *	5: [8192 - 16394) byte headers
4122 	 *	6: [16384 - 32768) byte headers
4123 	 *	7: [32768 - 65536) byte headers
4124 	 *	8: [65536 - 131072) byte headers
4125 	 *	9: 131072 byte headers
4126 	 *
4127 	 * If the ARC_CFLAG_VERBOSE flag was specified, we use the
4128 	 * physical and logical sizes directly. Thus, the histogram will
4129 	 * no longer be logarithmic; instead it will be linear with
4130 	 * respect to the size of the header. The following is a mapping
4131 	 * of the first many bucket numbers and the header size they
4132 	 * correspond to:
4133 	 *
4134 	 *	0: 0 byte headers
4135 	 *	1: 512 byte headers
4136 	 *	2: 1024 byte headers
4137 	 *	3: 1536 byte headers
4138 	 *	4: 2048 byte headers
4139 	 *	5: 2560 byte headers
4140 	 *	6: 3072 byte headers
4141 	 *
4142 	 * And so on. Keep in mind that a range of sizes isn't used in
4143 	 * the case of linear scale because the headers can only
4144 	 * increment or decrement in sizes of 512 bytes. So, it's not
4145 	 * possible for a header to be sized in between whats listed
4146 	 * above.
4147 	 *
4148 	 * Also, the above mapping values were calculated assuming a
4149 	 * SPA_MINBLOCKSHIFT of 512 bytes and a SPA_MAXBLOCKSIZE of 128K.
4150 	 */
4151 
4152 	if (data->arc_cflags & ARC_CFLAG_VERBOSE) {
4153 		cbucket = hdr.b_psize;
4154 		ubucket = hdr.b_lsize;
4155 	} else {
4156 		cbucket = highbit64(hdr.b_psize);
4157 		ubucket = highbit64(hdr.b_lsize);
4158 	}
4159 
4160 	bufcnt = hdr.b_l1hdr.b_bufcnt;
4161 	if (bufcnt >= data->hist_nbuckets)
4162 		bufcnt = data->hist_nbuckets - 1;
4163 
4164 	/* Ensure we stay within the bounds of the histogram array */
4165 	ASSERT3U(cbucket, <, data->hist_nbuckets);
4166 	ASSERT3U(ubucket, <, data->hist_nbuckets);
4167 
4168 	if (hdr.b_l1hdr.b_state == data->anon_sym.st_value) {
4169 		data->anon_c_hist[cbucket]++;
4170 		data->anon_u_hist[ubucket]++;
4171 		data->anon_bufs[bufcnt]++;
4172 	} else if (hdr.b_l1hdr.b_state == data->mru_sym.st_value) {
4173 		data->mru_c_hist[cbucket]++;
4174 		data->mru_u_hist[ubucket]++;
4175 		data->mru_bufs[bufcnt]++;
4176 	} else if (hdr.b_l1hdr.b_state == data->mfu_sym.st_value) {
4177 		data->mfu_c_hist[cbucket]++;
4178 		data->mfu_u_hist[ubucket]++;
4179 		data->mfu_bufs[bufcnt]++;
4180 	}
4181 
4182 	data->all_c_hist[cbucket]++;
4183 	data->all_u_hist[ubucket]++;
4184 	data->all_bufs[bufcnt]++;
4185 
4186 	return (WALK_NEXT);
4187 }
4188 
4189 /* ARGSUSED */
4190 static int
4191 arc_compression_stats(uintptr_t addr, uint_t flags, int argc,
4192     const mdb_arg_t *argv)
4193 {
4194 	arc_compression_stats_data_t data = { 0 };
4195 	unsigned int max_shifted = SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT;
4196 	unsigned int hist_size;
4197 	char range[32];
4198 	int rc = DCMD_OK;
4199 
4200 	if (mdb_getopts(argc, argv,
4201 	    'v', MDB_OPT_SETBITS, ARC_CFLAG_VERBOSE, &data.arc_cflags,
4202 	    'a', MDB_OPT_SETBITS, ARC_CFLAG_ANON, &data.arc_cflags,
4203 	    'b', MDB_OPT_SETBITS, ARC_CFLAG_BUFS, &data.arc_cflags,
4204 	    'r', MDB_OPT_SETBITS, ARC_CFLAG_MRU, &data.arc_cflags,
4205 	    'f', MDB_OPT_SETBITS, ARC_CFLAG_MFU, &data.arc_cflags,
4206 	    NULL) != argc)
4207 		return (DCMD_USAGE);
4208 
4209 	if (mdb_lookup_by_obj(ZFS_OBJ_NAME, "ARC_anon", &data.anon_sym) ||
4210 	    mdb_lookup_by_obj(ZFS_OBJ_NAME, "ARC_mru", &data.mru_sym) ||
4211 	    mdb_lookup_by_obj(ZFS_OBJ_NAME, "ARC_mru_ghost", &data.mrug_sym) ||
4212 	    mdb_lookup_by_obj(ZFS_OBJ_NAME, "ARC_mfu", &data.mfu_sym) ||
4213 	    mdb_lookup_by_obj(ZFS_OBJ_NAME, "ARC_mfu_ghost", &data.mfug_sym) ||
4214 	    mdb_lookup_by_obj(ZFS_OBJ_NAME, "ARC_l2c_only", &data.l2c_sym)) {
4215 		mdb_warn("can't find arc state symbol");
4216 		return (DCMD_ERR);
4217 	}
4218 
4219 	/*
4220 	 * Determine the maximum expected size for any header, and use
4221 	 * this to determine the number of buckets needed for each
4222 	 * histogram. If ARC_CFLAG_VERBOSE is specified, this value is
4223 	 * used directly; otherwise the log2 of the maximum size is
4224 	 * used. Thus, if using a log2 scale there's a maximum of 10
4225 	 * possible buckets, while the linear scale (when using
4226 	 * ARC_CFLAG_VERBOSE) has a maximum of 257 buckets.
4227 	 */
4228 	if (data.arc_cflags & ARC_CFLAG_VERBOSE)
4229 		data.hist_nbuckets = max_shifted + 1;
4230 	else
4231 		data.hist_nbuckets = highbit64(max_shifted) + 1;
4232 
4233 	hist_size = sizeof (uint64_t) * data.hist_nbuckets;
4234 
4235 	data.anon_c_hist = mdb_zalloc(hist_size, UM_SLEEP);
4236 	data.anon_u_hist = mdb_zalloc(hist_size, UM_SLEEP);
4237 	data.anon_bufs = mdb_zalloc(hist_size, UM_SLEEP);
4238 
4239 	data.mru_c_hist = mdb_zalloc(hist_size, UM_SLEEP);
4240 	data.mru_u_hist = mdb_zalloc(hist_size, UM_SLEEP);
4241 	data.mru_bufs = mdb_zalloc(hist_size, UM_SLEEP);
4242 
4243 	data.mfu_c_hist = mdb_zalloc(hist_size, UM_SLEEP);
4244 	data.mfu_u_hist = mdb_zalloc(hist_size, UM_SLEEP);
4245 	data.mfu_bufs = mdb_zalloc(hist_size, UM_SLEEP);
4246 
4247 	data.all_c_hist = mdb_zalloc(hist_size, UM_SLEEP);
4248 	data.all_u_hist = mdb_zalloc(hist_size, UM_SLEEP);
4249 	data.all_bufs = mdb_zalloc(hist_size, UM_SLEEP);
4250 
4251 	if (mdb_walk("arc_buf_hdr_t_full", arc_compression_stats_cb,
4252 	    &data) != 0) {
4253 		mdb_warn("can't walk arc_buf_hdr's");
4254 		rc = DCMD_ERR;
4255 		goto out;
4256 	}
4257 
4258 	if (data.arc_cflags & ARC_CFLAG_VERBOSE) {
4259 		rc = mdb_snprintf(range, sizeof (range),
4260 		    "[n*%llu, (n+1)*%llu)", SPA_MINBLOCKSIZE,
4261 		    SPA_MINBLOCKSIZE);
4262 	} else {
4263 		rc = mdb_snprintf(range, sizeof (range),
4264 		    "[2^(n-1)*%llu, 2^n*%llu)", SPA_MINBLOCKSIZE,
4265 		    SPA_MINBLOCKSIZE);
4266 	}
4267 
4268 	if (rc < 0) {
4269 		/* snprintf failed, abort the dcmd */
4270 		rc = DCMD_ERR;
4271 		goto out;
4272 	} else {
4273 		/* snprintf succeeded above, reset return code */
4274 		rc = DCMD_OK;
4275 	}
4276 
4277 	if (data.arc_cflags & ARC_CFLAG_ANON) {
4278 		if (data.arc_cflags & ARC_CFLAG_BUFS) {
4279 			mdb_printf("Histogram of the number of anon buffers "
4280 			    "that are associated with an arc hdr.\n");
4281 			dump_histogram(data.anon_bufs, data.hist_nbuckets, 0);
4282 			mdb_printf("\n");
4283 		}
4284 		mdb_printf("Histogram of compressed anon buffers.\n"
4285 		    "Each bucket represents buffers of size: %s.\n", range);
4286 		dump_histogram(data.anon_c_hist, data.hist_nbuckets, 0);
4287 		mdb_printf("\n");
4288 
4289 		mdb_printf("Histogram of uncompressed anon buffers.\n"
4290 		    "Each bucket represents buffers of size: %s.\n", range);
4291 		dump_histogram(data.anon_u_hist, data.hist_nbuckets, 0);
4292 		mdb_printf("\n");
4293 	}
4294 
4295 	if (data.arc_cflags & ARC_CFLAG_MRU) {
4296 		if (data.arc_cflags & ARC_CFLAG_BUFS) {
4297 			mdb_printf("Histogram of the number of mru buffers "
4298 			    "that are associated with an arc hdr.\n");
4299 			dump_histogram(data.mru_bufs, data.hist_nbuckets, 0);
4300 			mdb_printf("\n");
4301 		}
4302 		mdb_printf("Histogram of compressed mru buffers.\n"
4303 		    "Each bucket represents buffers of size: %s.\n", range);
4304 		dump_histogram(data.mru_c_hist, data.hist_nbuckets, 0);
4305 		mdb_printf("\n");
4306 
4307 		mdb_printf("Histogram of uncompressed mru buffers.\n"
4308 		    "Each bucket represents buffers of size: %s.\n", range);
4309 		dump_histogram(data.mru_u_hist, data.hist_nbuckets, 0);
4310 		mdb_printf("\n");
4311 	}
4312 
4313 	if (data.arc_cflags & ARC_CFLAG_MFU) {
4314 		if (data.arc_cflags & ARC_CFLAG_BUFS) {
4315 			mdb_printf("Histogram of the number of mfu buffers "
4316 			    "that are associated with an arc hdr.\n");
4317 			dump_histogram(data.mfu_bufs, data.hist_nbuckets, 0);
4318 			mdb_printf("\n");
4319 		}
4320 
4321 		mdb_printf("Histogram of compressed mfu buffers.\n"
4322 		    "Each bucket represents buffers of size: %s.\n", range);
4323 		dump_histogram(data.mfu_c_hist, data.hist_nbuckets, 0);
4324 		mdb_printf("\n");
4325 
4326 		mdb_printf("Histogram of uncompressed mfu buffers.\n"
4327 		    "Each bucket represents buffers of size: %s.\n", range);
4328 		dump_histogram(data.mfu_u_hist, data.hist_nbuckets, 0);
4329 		mdb_printf("\n");
4330 	}
4331 
4332 	if (data.arc_cflags & ARC_CFLAG_BUFS) {
4333 		mdb_printf("Histogram of all buffers that "
4334 		    "are associated with an arc hdr.\n");
4335 		dump_histogram(data.all_bufs, data.hist_nbuckets, 0);
4336 		mdb_printf("\n");
4337 	}
4338 
4339 	mdb_printf("Histogram of all compressed buffers.\n"
4340 	    "Each bucket represents buffers of size: %s.\n", range);
4341 	dump_histogram(data.all_c_hist, data.hist_nbuckets, 0);
4342 	mdb_printf("\n");
4343 
4344 	mdb_printf("Histogram of all uncompressed buffers.\n"
4345 	    "Each bucket represents buffers of size: %s.\n", range);
4346 	dump_histogram(data.all_u_hist, data.hist_nbuckets, 0);
4347 
4348 out:
4349 	mdb_free(data.anon_c_hist, hist_size);
4350 	mdb_free(data.anon_u_hist, hist_size);
4351 	mdb_free(data.anon_bufs, hist_size);
4352 
4353 	mdb_free(data.mru_c_hist, hist_size);
4354 	mdb_free(data.mru_u_hist, hist_size);
4355 	mdb_free(data.mru_bufs, hist_size);
4356 
4357 	mdb_free(data.mfu_c_hist, hist_size);
4358 	mdb_free(data.mfu_u_hist, hist_size);
4359 	mdb_free(data.mfu_bufs, hist_size);
4360 
4361 	mdb_free(data.all_c_hist, hist_size);
4362 	mdb_free(data.all_u_hist, hist_size);
4363 	mdb_free(data.all_bufs, hist_size);
4364 
4365 	return (rc);
4366 }
4367 
4368 typedef struct mdb_range_seg64 {
4369 	uint64_t rs_start;
4370 	uint64_t rs_end;
4371 } mdb_range_seg64_t;
4372 
4373 typedef struct mdb_range_seg32 {
4374 	uint32_t rs_start;
4375 	uint32_t rs_end;
4376 } mdb_range_seg32_t;
4377 
4378 /* ARGSUSED */
4379 static int
4380 range_tree_cb(uintptr_t addr, const void *unknown, void *arg)
4381 {
4382 	mdb_range_tree_t *rt = (mdb_range_tree_t *)arg;
4383 	uint64_t start, end;
4384 
4385 	if (rt->rt_type == RANGE_SEG64) {
4386 		mdb_range_seg64_t rs;
4387 
4388 		if (mdb_ctf_vread(&rs, ZFS_STRUCT "range_seg64",
4389 		    "mdb_range_seg64_t", addr, 0) == -1)
4390 			return (DCMD_ERR);
4391 		start = rs.rs_start;
4392 		end = rs.rs_end;
4393 	} else {
4394 		ASSERT3U(rt->rt_type, ==, RANGE_SEG32);
4395 		mdb_range_seg32_t rs;
4396 
4397 		if (mdb_ctf_vread(&rs, ZFS_STRUCT "range_seg32",
4398 		    "mdb_range_seg32_t", addr, 0) == -1)
4399 			return (DCMD_ERR);
4400 		start = ((uint64_t)rs.rs_start << rt->rt_shift) + rt->rt_start;
4401 		end = ((uint64_t)rs.rs_end << rt->rt_shift) + rt->rt_start;
4402 	}
4403 
4404 	mdb_printf("\t[%llx %llx) (length %llx)\n", start, end, end - start);
4405 
4406 	return (0);
4407 }
4408 
4409 /* ARGSUSED */
4410 static int
4411 range_tree(uintptr_t addr, uint_t flags, int argc,
4412     const mdb_arg_t *argv)
4413 {
4414 	mdb_range_tree_t rt;
4415 	uintptr_t btree_addr;
4416 
4417 	if (!(flags & DCMD_ADDRSPEC))
4418 		return (DCMD_USAGE);
4419 
4420 	if (mdb_ctf_vread(&rt, ZFS_STRUCT "range_tree", "mdb_range_tree_t",
4421 	    addr, 0) == -1)
4422 		return (DCMD_ERR);
4423 
4424 	mdb_printf("%p: range tree of %llu entries, %llu bytes\n",
4425 	    addr, rt.rt_root.bt_num_elems, rt.rt_space);
4426 
4427 	btree_addr = addr +
4428 	    mdb_ctf_offsetof_by_name(ZFS_STRUCT "range_tree", "rt_root");
4429 
4430 	if (mdb_pwalk("zfs_btree", range_tree_cb, &rt, btree_addr) != 0) {
4431 		mdb_warn("can't walk range_tree segments");
4432 		return (DCMD_ERR);
4433 	}
4434 	return (DCMD_OK);
4435 }
4436 
4437 typedef struct mdb_spa_log_sm {
4438 	uint64_t sls_sm_obj;
4439 	uint64_t sls_txg;
4440 	uint64_t sls_nblocks;
4441 	uint64_t sls_mscount;
4442 } mdb_spa_log_sm_t;
4443 
4444 /* ARGSUSED */
4445 static int
4446 logsm_stats_cb(uintptr_t addr, const void *unknown, void *arg)
4447 {
4448 	mdb_spa_log_sm_t sls;
4449 	if (mdb_ctf_vread(&sls, ZFS_STRUCT "spa_log_sm", "mdb_spa_log_sm_t",
4450 	    addr, 0) == -1)
4451 		return (WALK_ERR);
4452 
4453 	mdb_printf("%7lld %7lld %7lld %7lld\n",
4454 	    sls.sls_txg, sls.sls_nblocks, sls.sls_mscount, sls.sls_sm_obj);
4455 
4456 	return (WALK_NEXT);
4457 }
4458 typedef struct mdb_log_summary_entry {
4459 	uint64_t lse_start;
4460 	uint64_t lse_blkcount;
4461 	uint64_t lse_mscount;
4462 } mdb_log_summary_entry_t;
4463 
4464 /* ARGSUSED */
4465 static int
4466 logsm_summary_cb(uintptr_t addr, const void *unknown, void *arg)
4467 {
4468 	mdb_log_summary_entry_t lse;
4469 	if (mdb_ctf_vread(&lse, ZFS_STRUCT "log_summary_entry",
4470 	    "mdb_log_summary_entry_t", addr, 0) == -1)
4471 		return (WALK_ERR);
4472 
4473 	mdb_printf("%7lld %7lld %7lld\n",
4474 	    lse.lse_start, lse.lse_blkcount, lse.lse_mscount);
4475 	return (WALK_NEXT);
4476 }
4477 
4478 /* ARGSUSED */
4479 static int
4480 logsm_stats(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
4481 {
4482 	if (!(flags & DCMD_ADDRSPEC))
4483 		return (DCMD_USAGE);
4484 
4485 	uintptr_t sls_avl_addr = addr +
4486 	    mdb_ctf_offsetof_by_name(ZFS_STRUCT "spa", "spa_sm_logs_by_txg");
4487 	uintptr_t summary_addr = addr +
4488 	    mdb_ctf_offsetof_by_name(ZFS_STRUCT "spa", "spa_log_summary");
4489 
4490 	mdb_printf("Log Entries:\n");
4491 	mdb_printf("%7s %7s %7s %7s\n", "txg", "blk", "ms", "obj");
4492 	if (mdb_pwalk("avl", logsm_stats_cb, NULL, sls_avl_addr) != 0)
4493 		return (DCMD_ERR);
4494 
4495 	mdb_printf("\nSummary Entries:\n");
4496 	mdb_printf("%7s %7s %7s\n", "txg", "blk", "ms");
4497 	if (mdb_pwalk("list", logsm_summary_cb, NULL, summary_addr) != 0)
4498 		return (DCMD_ERR);
4499 
4500 	return (DCMD_OK);
4501 }
4502 
4503 /*
4504  * MDB module linkage information:
4505  *
4506  * We declare a list of structures describing our dcmds, and a function
4507  * named _mdb_init to return a pointer to our module information.
4508  */
4509 
4510 static const mdb_dcmd_t dcmds[] = {
4511 	{ "arc", "[-bkmg]", "print ARC variables", arc_print },
4512 	{ "blkptr", ":", "print blkptr_t", blkptr },
4513 	{ "dva", ":", "print dva_t", dva },
4514 	{ "dbuf", ":", "print dmu_buf_impl_t", dbuf },
4515 	{ "dbuf_stats", ":", "dbuf stats", dbuf_stats },
4516 	{ "dbufs",
4517 	    "\t[-O objset_t*] [-n objset_name | \"mos\"] "
4518 	    "[-o object | \"mdn\"] \n"
4519 	    "\t[-l level] [-b blkid | \"bonus\"]",
4520 	    "find dmu_buf_impl_t's that match specified criteria", dbufs },
4521 	{ "abuf_find", "dva_word[0] dva_word[1]",
4522 	    "find arc_buf_hdr_t of a specified DVA",
4523 	    abuf_find },
4524 	{ "logsm_stats", ":", "print log space map statistics of a spa_t",
4525 	    logsm_stats},
4526 	{ "spa", "?[-cevmMh]\n"
4527 	    "\t-c display spa config\n"
4528 	    "\t-e display vdev statistics\n"
4529 	    "\t-v display vdev information\n"
4530 	    "\t-m display metaslab statistics\n"
4531 	    "\t-M display metaslab group statistics\n"
4532 	    "\t-h display histogram (requires -m or -M)\n",
4533 	    "spa_t summary", spa_print },
4534 	{ "spa_config", ":", "print spa_t configuration", spa_print_config },
4535 	{ "spa_space", ":[-b]", "print spa_t on-disk space usage", spa_space },
4536 	{ "spa_vdevs", ":[-emMh]\n"
4537 	    "\t-e display vdev statistics\n"
4538 	    "\t-m dispaly metaslab statistics\n"
4539 	    "\t-M display metaslab group statistic\n"
4540 	    "\t-h display histogram (requires -m or -M)\n",
4541 	    "given a spa_t, print vdev summary", spa_vdevs },
4542 	{ "sm_entries", "<buffer length in bytes>",
4543 	    "print out space map entries from a buffer decoded",
4544 	    sm_entries},
4545 	{ "vdev", ":[-remMh]\n"
4546 	    "\t-r display recursively\n"
4547 	    "\t-e display statistics\n"
4548 	    "\t-m display metaslab statistics (top level vdev only)\n"
4549 	    "\t-M display metaslab group statistics (top level vdev only)\n"
4550 	    "\t-h display histogram (requires -m or -M)\n",
4551 	    "vdev_t summary", vdev_print },
4552 	{ "zio", ":[-cpr]\n"
4553 	    "\t-c display children\n"
4554 	    "\t-p display parents\n"
4555 	    "\t-r display recursively",
4556 	    "zio_t summary", zio_print },
4557 	{ "zio_state", "?", "print out all zio_t structures on system or "
4558 	    "for a particular pool", zio_state },
4559 	{ "zfs_blkstats", ":[-v]",
4560 	    "given a spa_t, print block type stats from last scrub",
4561 	    zfs_blkstats },
4562 	{ "zfs_params", "", "print zfs tunable parameters", zfs_params },
4563 	{ "zfs_refcount", ":[-r]\n"
4564 	    "\t-r display recently removed references",
4565 	    "print zfs_refcount_t holders", zfs_refcount },
4566 	{ "zap_leaf", "", "print zap_leaf_phys_t", zap_leaf },
4567 	{ "zfs_aces", ":[-v]", "print all ACEs from a zfs_acl_t",
4568 	    zfs_acl_dump },
4569 	{ "zfs_ace", ":[-v]", "print zfs_ace", zfs_ace_print },
4570 	{ "zfs_ace0", ":[-v]", "print zfs_ace0", zfs_ace0_print },
4571 	{ "sa_attr_table", ":", "print SA attribute table from sa_os_t",
4572 	    sa_attr_table},
4573 	{ "sa_attr", ": attr_id",
4574 	    "print SA attribute address when given sa_handle_t", sa_attr_print},
4575 	{ "zfs_dbgmsg", ":[-va]",
4576 	    "print zfs debug log", dbgmsg},
4577 	{ "rrwlock", ":",
4578 	    "print rrwlock_t, including readers", rrwlock},
4579 	{ "metaslab_weight", "weight",
4580 	    "print metaslab weight", metaslab_weight},
4581 	{ "metaslab_trace", ":",
4582 	    "print metaslab allocation trace records", metaslab_trace},
4583 	{ "arc_compression_stats", ":[-vabrf]\n"
4584 	    "\t-v verbose, display a linearly scaled histogram\n"
4585 	    "\t-a display ARC_anon state statistics individually\n"
4586 	    "\t-r display ARC_mru state statistics individually\n"
4587 	    "\t-f display ARC_mfu state statistics individually\n"
4588 	    "\t-b display histogram of buffer counts\n",
4589 	    "print a histogram of compressed arc buffer sizes",
4590 	    arc_compression_stats},
4591 	{ "range_tree", ":",
4592 	    "print entries in range_tree_t", range_tree},
4593 	{ NULL }
4594 };
4595 
4596 static const mdb_walker_t walkers[] = {
4597 	{ "txg_list", "given any txg_list_t *, walk all entries in all txgs",
4598 	    txg_list_walk_init, txg_list_walk_step, NULL },
4599 	{ "txg_list0", "given any txg_list_t *, walk all entries in txg 0",
4600 	    txg_list0_walk_init, txg_list_walk_step, NULL },
4601 	{ "txg_list1", "given any txg_list_t *, walk all entries in txg 1",
4602 	    txg_list1_walk_init, txg_list_walk_step, NULL },
4603 	{ "txg_list2", "given any txg_list_t *, walk all entries in txg 2",
4604 	    txg_list2_walk_init, txg_list_walk_step, NULL },
4605 	{ "txg_list3", "given any txg_list_t *, walk all entries in txg 3",
4606 	    txg_list3_walk_init, txg_list_walk_step, NULL },
4607 	{ "zio", "walk all zio structures, optionally for a particular spa_t",
4608 	    zio_walk_init, zio_walk_step, NULL },
4609 	{ "zio_root",
4610 	    "walk all root zio_t structures, optionally for a particular spa_t",
4611 	    zio_walk_init, zio_walk_root_step, NULL },
4612 	{ "spa", "walk all spa_t entries in the namespace",
4613 	    spa_walk_init, spa_walk_step, NULL },
4614 	{ "metaslab", "given a spa_t *, walk all metaslab_t structures",
4615 	    metaslab_walk_init, metaslab_walk_step, NULL },
4616 	{ "multilist", "given a multilist_t *, walk all list_t structures",
4617 	    multilist_walk_init, multilist_walk_step, NULL },
4618 	{ "zfs_acl_node", "given a zfs_acl_t, walk all zfs_acl_nodes",
4619 	    zfs_acl_node_walk_init, zfs_acl_node_walk_step, NULL },
4620 	{ "zfs_acl_node_aces", "given a zfs_acl_node_t, walk all ACEs",
4621 	    zfs_acl_node_aces_walk_init, zfs_aces_walk_step, NULL },
4622 	{ "zfs_acl_node_aces0",
4623 	    "given a zfs_acl_node_t, walk all ACEs as ace_t",
4624 	    zfs_acl_node_aces0_walk_init, zfs_aces_walk_step, NULL },
4625 	{ "zfs_btree", "given a zfs_btree_t *, walk all entries",
4626 	    btree_walk_init, btree_walk_step, btree_walk_fini },
4627 	{ NULL }
4628 };
4629 
4630 static const mdb_modinfo_t modinfo = {
4631 	MDB_API_VERSION, dcmds, walkers
4632 };
4633 
4634 const mdb_modinfo_t *
4635 _mdb_init(void)
4636 {
4637 	return (&modinfo);
4638 }
4639