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Date:      Thu, 26 Oct 2017 16:20:47 +0000 (UTC)
From:      Andriy Gapon <avg@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org
Subject:   svn commit: r325013 - in vendor/illumos/dist: cmd/zdb cmd/ztest lib/libcmdutils lib/libcmdutils/common lib/libzfs/common lib/libzpool/common lib/libzpool/common/sys
Message-ID:  <201710261620.v9QGKl7j038588@repo.freebsd.org>

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Author: avg
Date: Thu Oct 26 16:20:47 2017
New Revision: 325013
URL: https://svnweb.freebsd.org/changeset/base/325013

Log:
  640 number_to_scaled_string is duplicated in several commands
  
  illumos/illumos-gate@0a0551200ecbcd4f1b17560acaeeb7b6c8b0090e
  https://github.com/illumos/illumos-gate/commit/0a0551200ecbcd4f1b17560acaeeb7b6c8b0090e
  
  https://www.illumos.org/issues/640
    du(1), df(1m), ls(1), and swap(1m) all include a copy (it appears literally
    copied) of the 'number_to_scaled_string' function in their source. This should
    be moved to a shared library and all 4 commands should use this instead.
  
  Reviewed by: Sebastian Wiedenroth <wiedi@frubar.net>
  Reviewed by: Robert Mustacchi <rm@joyent.com>
  Reviewed by: Yuri Pankov <yuripv@gmx.com>
  Approved by: Dan McDonald <danmcd@joyent.com>
  Author: Jason King <jason.brian.king@gmail.com>

Added:
  vendor/illumos/dist/lib/libcmdutils/
  vendor/illumos/dist/lib/libcmdutils/common/
  vendor/illumos/dist/lib/libcmdutils/common/nicenum.c   (contents, props changed)
Modified:
  vendor/illumos/dist/cmd/zdb/zdb.c
  vendor/illumos/dist/cmd/ztest/ztest.c
  vendor/illumos/dist/lib/libzfs/common/libzfs_util.c
  vendor/illumos/dist/lib/libzpool/common/sys/zfs_context.h
  vendor/illumos/dist/lib/libzpool/common/util.c

Modified: vendor/illumos/dist/cmd/zdb/zdb.c
==============================================================================
--- vendor/illumos/dist/cmd/zdb/zdb.c	Thu Oct 26 16:02:38 2017	(r325012)
+++ vendor/illumos/dist/cmd/zdb/zdb.c	Thu Oct 26 16:20:47 2017	(r325013)
@@ -63,6 +63,7 @@
 #include <sys/abd.h>
 #include <sys/blkptr.h>
 #include <zfs_comutil.h>
+#include <libcmdutils.h>
 #undef verify
 #include <libzfs.h>
 
@@ -277,12 +278,12 @@ dump_history_offsets(objset_t *os, uint64_t object, vo
 }
 
 static void
-zdb_nicenum(uint64_t num, char *buf)
+zdb_nicenum(uint64_t num, char *buf, size_t buflen)
 {
 	if (dump_opt['P'])
-		(void) sprintf(buf, "%llu", (longlong_t)num);
+		(void) snprintf(buf, buflen, "%llu", (longlong_t)num);
 	else
-		nicenum(num, buf);
+		nicenum(num, buf, sizeof (buf));
 }
 
 static const char histo_stars[] = "****************************************";
@@ -459,12 +460,17 @@ dump_bpobj(objset_t *os, uint64_t object, void *data, 
 	bpobj_phys_t *bpop = data;
 	char bytes[32], comp[32], uncomp[32];
 
+	/* make sure the output won't get truncated */
+	CTASSERT(sizeof (bytes) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (comp) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (uncomp) >= NN_NUMBUF_SZ);
+
 	if (bpop == NULL)
 		return;
 
-	zdb_nicenum(bpop->bpo_bytes, bytes);
-	zdb_nicenum(bpop->bpo_comp, comp);
-	zdb_nicenum(bpop->bpo_uncomp, uncomp);
+	zdb_nicenum(bpop->bpo_bytes, bytes, sizeof (bytes));
+	zdb_nicenum(bpop->bpo_comp, comp, sizeof (comp));
+	zdb_nicenum(bpop->bpo_uncomp, uncomp, sizeof (uncomp));
 
 	(void) printf("\t\tnum_blkptrs = %llu\n",
 	    (u_longlong_t)bpop->bpo_num_blkptrs);
@@ -757,8 +763,11 @@ dump_metaslab_stats(metaslab_t *msp)
 	avl_tree_t *t = &msp->ms_size_tree;
 	int free_pct = range_tree_space(rt) * 100 / msp->ms_size;
 
-	zdb_nicenum(metaslab_block_maxsize(msp), maxbuf);
+	/* max sure nicenum has enough space */
+	CTASSERT(sizeof (maxbuf) >= NN_NUMBUF_SZ);
 
+	zdb_nicenum(metaslab_block_maxsize(msp), maxbuf, sizeof (maxbuf));
+
 	(void) printf("\t %25s %10lu   %7s  %6s   %4s %4d%%\n",
 	    "segments", avl_numnodes(t), "maxsize", maxbuf,
 	    "freepct", free_pct);
@@ -774,7 +783,8 @@ dump_metaslab(metaslab_t *msp)
 	space_map_t *sm = msp->ms_sm;
 	char freebuf[32];
 
-	zdb_nicenum(msp->ms_size - space_map_allocated(sm), freebuf);
+	zdb_nicenum(msp->ms_size - space_map_allocated(sm), freebuf,
+	    sizeof (freebuf));
 
 	(void) printf(
 	    "\tmetaslab %6llu   offset %12llx   spacemap %6llu   free    %5s\n",
@@ -1334,6 +1344,9 @@ dump_dsl_dir(objset_t *os, uint64_t object, void *data
 	time_t crtime;
 	char nice[32];
 
+	/* make sure nicenum has enough space */
+	CTASSERT(sizeof (nice) >= NN_NUMBUF_SZ);
+
 	if (dd == NULL)
 		return;
 
@@ -1349,15 +1362,15 @@ dump_dsl_dir(objset_t *os, uint64_t object, void *data
 	    (u_longlong_t)dd->dd_origin_obj);
 	(void) printf("\t\tchild_dir_zapobj = %llu\n",
 	    (u_longlong_t)dd->dd_child_dir_zapobj);
-	zdb_nicenum(dd->dd_used_bytes, nice);
+	zdb_nicenum(dd->dd_used_bytes, nice, sizeof (nice));
 	(void) printf("\t\tused_bytes = %s\n", nice);
-	zdb_nicenum(dd->dd_compressed_bytes, nice);
+	zdb_nicenum(dd->dd_compressed_bytes, nice, sizeof (nice));
 	(void) printf("\t\tcompressed_bytes = %s\n", nice);
-	zdb_nicenum(dd->dd_uncompressed_bytes, nice);
+	zdb_nicenum(dd->dd_uncompressed_bytes, nice, sizeof (nice));
 	(void) printf("\t\tuncompressed_bytes = %s\n", nice);
-	zdb_nicenum(dd->dd_quota, nice);
+	zdb_nicenum(dd->dd_quota, nice, sizeof (nice));
 	(void) printf("\t\tquota = %s\n", nice);
-	zdb_nicenum(dd->dd_reserved, nice);
+	zdb_nicenum(dd->dd_reserved, nice, sizeof (nice));
 	(void) printf("\t\treserved = %s\n", nice);
 	(void) printf("\t\tprops_zapobj = %llu\n",
 	    (u_longlong_t)dd->dd_props_zapobj);
@@ -1367,7 +1380,8 @@ dump_dsl_dir(objset_t *os, uint64_t object, void *data
 	    (u_longlong_t)dd->dd_flags);
 
 #define	DO(which) \
-	zdb_nicenum(dd->dd_used_breakdown[DD_USED_ ## which], nice); \
+	zdb_nicenum(dd->dd_used_breakdown[DD_USED_ ## which], nice, \
+	    sizeof (nice)); \
 	(void) printf("\t\tused_breakdown[" #which "] = %s\n", nice)
 	DO(HEAD);
 	DO(SNAP);
@@ -1386,15 +1400,22 @@ dump_dsl_dataset(objset_t *os, uint64_t object, void *
 	char used[32], compressed[32], uncompressed[32], unique[32];
 	char blkbuf[BP_SPRINTF_LEN];
 
+	/* make sure nicenum has enough space */
+	CTASSERT(sizeof (used) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (compressed) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (uncompressed) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (unique) >= NN_NUMBUF_SZ);
+
 	if (ds == NULL)
 		return;
 
 	ASSERT(size == sizeof (*ds));
 	crtime = ds->ds_creation_time;
-	zdb_nicenum(ds->ds_referenced_bytes, used);
-	zdb_nicenum(ds->ds_compressed_bytes, compressed);
-	zdb_nicenum(ds->ds_uncompressed_bytes, uncompressed);
-	zdb_nicenum(ds->ds_unique_bytes, unique);
+	zdb_nicenum(ds->ds_referenced_bytes, used, sizeof (used));
+	zdb_nicenum(ds->ds_compressed_bytes, compressed, sizeof (compressed));
+	zdb_nicenum(ds->ds_uncompressed_bytes, uncompressed,
+	    sizeof (uncompressed));
+	zdb_nicenum(ds->ds_unique_bytes, unique, sizeof (unique));
 	snprintf_blkptr(blkbuf, sizeof (blkbuf), &ds->ds_bp);
 
 	(void) printf("\t\tdir_obj = %llu\n",
@@ -1453,12 +1474,15 @@ dump_bptree(objset_t *os, uint64_t obj, const char *na
 	bptree_phys_t *bt;
 	dmu_buf_t *db;
 
+	/* make sure nicenum has enough space */
+	CTASSERT(sizeof (bytes) >= NN_NUMBUF_SZ);
+
 	if (dump_opt['d'] < 3)
 		return;
 
 	VERIFY3U(0, ==, dmu_bonus_hold(os, obj, FTAG, &db));
 	bt = db->db_data;
-	zdb_nicenum(bt->bt_bytes, bytes);
+	zdb_nicenum(bt->bt_bytes, bytes, sizeof (bytes));
 	(void) printf("\n    %s: %llu datasets, %s\n",
 	    name, (unsigned long long)(bt->bt_end - bt->bt_begin), bytes);
 	dmu_buf_rele(db, FTAG);
@@ -1490,13 +1514,18 @@ dump_full_bpobj(bpobj_t *bpo, const char *name, int in
 	char comp[32];
 	char uncomp[32];
 
+	/* make sure nicenum has enough space */
+	CTASSERT(sizeof (bytes) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (comp) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (uncomp) >= NN_NUMBUF_SZ);
+
 	if (dump_opt['d'] < 3)
 		return;
 
-	zdb_nicenum(bpo->bpo_phys->bpo_bytes, bytes);
+	zdb_nicenum(bpo->bpo_phys->bpo_bytes, bytes, sizeof (bytes));
 	if (bpo->bpo_havesubobj && bpo->bpo_phys->bpo_subobjs != 0) {
-		zdb_nicenum(bpo->bpo_phys->bpo_comp, comp);
-		zdb_nicenum(bpo->bpo_phys->bpo_uncomp, uncomp);
+		zdb_nicenum(bpo->bpo_phys->bpo_comp, comp, sizeof (comp));
+		zdb_nicenum(bpo->bpo_phys->bpo_uncomp, uncomp, sizeof (uncomp));
 		(void) printf("    %*s: object %llu, %llu local blkptrs, "
 		    "%llu subobjs in object %llu, %s (%s/%s comp)\n",
 		    indent * 8, name,
@@ -1550,6 +1579,11 @@ dump_deadlist(dsl_deadlist_t *dl)
 	char comp[32];
 	char uncomp[32];
 
+	/* make sure nicenum has enough space */
+	CTASSERT(sizeof (bytes) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (comp) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (uncomp) >= NN_NUMBUF_SZ);
+
 	if (dump_opt['d'] < 3)
 		return;
 
@@ -1558,9 +1592,9 @@ dump_deadlist(dsl_deadlist_t *dl)
 		return;
 	}
 
-	zdb_nicenum(dl->dl_phys->dl_used, bytes);
-	zdb_nicenum(dl->dl_phys->dl_comp, comp);
-	zdb_nicenum(dl->dl_phys->dl_uncomp, uncomp);
+	zdb_nicenum(dl->dl_phys->dl_used, bytes, sizeof (bytes));
+	zdb_nicenum(dl->dl_phys->dl_comp, comp, sizeof (comp));
+	zdb_nicenum(dl->dl_phys->dl_uncomp, uncomp, sizeof (uncomp));
 	(void) printf("\n    Deadlist: %s (%s/%s comp)\n",
 	    bytes, comp, uncomp);
 
@@ -1863,6 +1897,13 @@ dump_object(objset_t *os, uint64_t object, int verbosi
 	char aux[50];
 	int error;
 
+	/* make sure nicenum has enough space */
+	CTASSERT(sizeof (iblk) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (dblk) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (lsize) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (asize) >= NN_NUMBUF_SZ);
+	CTASSERT(sizeof (bonus_size) >= NN_NUMBUF_SZ);
+
 	if (*print_header) {
 		(void) printf("\n%10s  %3s  %5s  %5s  %5s  %5s  %6s  %s\n",
 		    "Object", "lvl", "iblk", "dblk", "dsize", "lsize",
@@ -1883,11 +1924,11 @@ dump_object(objset_t *os, uint64_t object, int verbosi
 	}
 	dmu_object_info_from_dnode(dn, &doi);
 
-	zdb_nicenum(doi.doi_metadata_block_size, iblk);
-	zdb_nicenum(doi.doi_data_block_size, dblk);
-	zdb_nicenum(doi.doi_max_offset, lsize);
-	zdb_nicenum(doi.doi_physical_blocks_512 << 9, asize);
-	zdb_nicenum(doi.doi_bonus_size, bonus_size);
+	zdb_nicenum(doi.doi_metadata_block_size, iblk, sizeof (iblk));
+	zdb_nicenum(doi.doi_data_block_size, dblk, sizeof (dblk));
+	zdb_nicenum(doi.doi_max_offset, lsize, sizeof (lsize));
+	zdb_nicenum(doi.doi_physical_blocks_512 << 9, asize, sizeof (asize));
+	zdb_nicenum(doi.doi_bonus_size, bonus_size, sizeof (bonus_size));
 	(void) sprintf(fill, "%6.2f", 100.0 * doi.doi_fill_count *
 	    doi.doi_data_block_size / (object == 0 ? DNODES_PER_BLOCK : 1) /
 	    doi.doi_max_offset);
@@ -1950,6 +1991,8 @@ dump_object(objset_t *os, uint64_t object, int verbosi
 
 		for (;;) {
 			char segsize[32];
+			/* make sure nicenum has enough space */
+			CTASSERT(sizeof (segsize) >= NN_NUMBUF_SZ);
 			error = dnode_next_offset(dn,
 			    0, &start, minlvl, blkfill, 0);
 			if (error)
@@ -1957,7 +2000,7 @@ dump_object(objset_t *os, uint64_t object, int verbosi
 			end = start;
 			error = dnode_next_offset(dn,
 			    DNODE_FIND_HOLE, &end, minlvl, blkfill, 0);
-			zdb_nicenum(end - start, segsize);
+			zdb_nicenum(end - start, segsize, sizeof (segsize));
 			(void) printf("\t\tsegment [%016llx, %016llx)"
 			    " size %5s\n", (u_longlong_t)start,
 			    (u_longlong_t)end, segsize);
@@ -1989,6 +2032,9 @@ dump_dir(objset_t *os)
 	unsigned i;
 	int error;
 
+	/* make sure nicenum has enough space */
+	CTASSERT(sizeof (numbuf) >= NN_NUMBUF_SZ);
+
 	dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
 	dmu_objset_fast_stat(os, &dds);
 	dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
@@ -2007,7 +2053,7 @@ dump_dir(objset_t *os)
 
 	ASSERT3U(usedobjs, ==, BP_GET_FILL(os->os_rootbp));
 
-	zdb_nicenum(refdbytes, numbuf);
+	zdb_nicenum(refdbytes, numbuf, sizeof (numbuf));
 
 	if (verbosity >= 4) {
 		(void) snprintf(blkbuf, sizeof (blkbuf), ", rootbp ");
@@ -2652,6 +2698,9 @@ zdb_blkptr_cb(spa_t *spa, zilog_t *zilog, const blkptr
 		int sec_remaining =
 		    (zcb->zcb_totalasize - bytes) / 1024 / kb_per_sec;
 
+		/* make sure nicenum has enough space */
+		CTASSERT(sizeof (buf) >= NN_NUMBUF_SZ);
+
 		zfs_nicenum(bytes, buf, sizeof (buf));
 		(void) fprintf(stderr,
 		    "\r%5s completed (%4dMB/s) "
@@ -3003,6 +3052,14 @@ dump_block_stats(spa_t *spa)
 			char avg[32], gang[32];
 			const char *typename;
 
+			/* make sure nicenum has enough space */
+			CTASSERT(sizeof (csize) >= NN_NUMBUF_SZ);
+			CTASSERT(sizeof (lsize) >= NN_NUMBUF_SZ);
+			CTASSERT(sizeof (psize) >= NN_NUMBUF_SZ);
+			CTASSERT(sizeof (asize) >= NN_NUMBUF_SZ);
+			CTASSERT(sizeof (avg) >= NN_NUMBUF_SZ);
+			CTASSERT(sizeof (gang) >= NN_NUMBUF_SZ);
+
 			if (t < DMU_OT_NUMTYPES)
 				typename = dmu_ot[t].ot_name;
 			else
@@ -3036,12 +3093,17 @@ dump_block_stats(spa_t *spa)
 				    zcb.zcb_type[ZB_TOTAL][t].zb_asize)
 					continue;
 
-				zdb_nicenum(zb->zb_count, csize);
-				zdb_nicenum(zb->zb_lsize, lsize);
-				zdb_nicenum(zb->zb_psize, psize);
-				zdb_nicenum(zb->zb_asize, asize);
-				zdb_nicenum(zb->zb_asize / zb->zb_count, avg);
-				zdb_nicenum(zb->zb_gangs, gang);
+				zdb_nicenum(zb->zb_count, csize,
+				    sizeof (csize));
+				zdb_nicenum(zb->zb_lsize, lsize,
+				    sizeof (lsize));
+				zdb_nicenum(zb->zb_psize, psize,
+				    sizeof (psize));
+				zdb_nicenum(zb->zb_asize, asize,
+				    sizeof (asize));
+				zdb_nicenum(zb->zb_asize / zb->zb_count, avg,
+				    sizeof (avg));
+				zdb_nicenum(zb->zb_gangs, gang, sizeof (gang));
 
 				(void) printf("%6s\t%5s\t%5s\t%5s\t%5s"
 				    "\t%5.2f\t%6.2f\t",

Modified: vendor/illumos/dist/cmd/ztest/ztest.c
==============================================================================
--- vendor/illumos/dist/cmd/ztest/ztest.c	Thu Oct 26 16:02:38 2017	(r325012)
+++ vendor/illumos/dist/cmd/ztest/ztest.c	Thu Oct 26 16:20:47 2017	(r325013)
@@ -24,6 +24,7 @@
  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  * Copyright (c) 2014 Integros [integros.com]
+ * Copyright 2017 Joyent, Inc.
  */
 
 /*
@@ -123,6 +124,7 @@
 #include <math.h>
 #include <sys/fs/zfs.h>
 #include <libnvpair.h>
+#include <libcmdutils.h>
 
 static int ztest_fd_data = -1;
 static int ztest_fd_rand = -1;
@@ -554,12 +556,13 @@ usage(boolean_t requested)
 {
 	const ztest_shared_opts_t *zo = &ztest_opts_defaults;
 
-	char nice_vdev_size[10];
-	char nice_gang_bang[10];
+	char nice_vdev_size[NN_NUMBUF_SZ];
+	char nice_gang_bang[NN_NUMBUF_SZ];
 	FILE *fp = requested ? stdout : stderr;
 
-	nicenum(zo->zo_vdev_size, nice_vdev_size);
-	nicenum(zo->zo_metaslab_gang_bang, nice_gang_bang);
+	nicenum(zo->zo_vdev_size, nice_vdev_size, sizeof (nice_vdev_size));
+	nicenum(zo->zo_metaslab_gang_bang, nice_gang_bang,
+	    sizeof (nice_gang_bang));
 
 	(void) fprintf(fp, "Usage: %s\n"
 	    "\t[-v vdevs (default: %llu)]\n"
@@ -3166,10 +3169,10 @@ ztest_vdev_LUN_growth(ztest_ds_t *zd, uint64_t id)
 		    old_class_space, new_class_space);
 
 	if (ztest_opts.zo_verbose >= 5) {
-		char oldnumbuf[6], newnumbuf[6];
+		char oldnumbuf[NN_NUMBUF_SZ], newnumbuf[NN_NUMBUF_SZ];
 
-		nicenum(old_class_space, oldnumbuf);
-		nicenum(new_class_space, newnumbuf);
+		nicenum(old_class_space, oldnumbuf, sizeof (oldnumbuf));
+		nicenum(new_class_space, newnumbuf, sizeof (newnumbuf));
 		(void) printf("%s grew from %s to %s\n",
 		    spa->spa_name, oldnumbuf, newnumbuf);
 	}
@@ -6207,7 +6210,7 @@ main(int argc, char **argv)
 	ztest_info_t *zi;
 	ztest_shared_callstate_t *zc;
 	char timebuf[100];
-	char numbuf[6];
+	char numbuf[NN_NUMBUF_SZ];
 	spa_t *spa;
 	char *cmd;
 	boolean_t hasalt;
@@ -6344,7 +6347,7 @@ main(int argc, char **argv)
 
 			now = MIN(now, zs->zs_proc_stop);
 			print_time(zs->zs_proc_stop - now, timebuf);
-			nicenum(zs->zs_space, numbuf);
+			nicenum(zs->zs_space, numbuf, sizeof (numbuf));
 
 			(void) printf("Pass %3d, %8s, %3llu ENOSPC, "
 			    "%4.1f%% of %5s used, %3.0f%% done, %8s to go\n",

Added: vendor/illumos/dist/lib/libcmdutils/common/nicenum.c
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ vendor/illumos/dist/lib/libcmdutils/common/nicenum.c	Thu Oct 26 16:20:47 2017	(r325013)
@@ -0,0 +1,130 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2017 Jason king
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/debug.h>
+#include "libcmdutils.h"
+
+/* The largest suffix that can fit, aka an exabyte (2^60 / 10^18) */
+#define	INDEX_MAX	(6)
+
+/* Verify INDEX_MAX fits */
+CTASSERT(INDEX_MAX * 10 < sizeof (uint64_t) * 8);
+
+void
+nicenum_scale(uint64_t n, size_t units, char *buf, size_t buflen,
+    uint32_t flags)
+{
+	uint64_t divamt = 1024;
+	uint64_t divisor = 1;
+	int index = 0;
+	int rc = 0;
+	char u;
+
+	if (units == 0)
+		units = 1;
+
+	if (n > 0) {
+		n *= units;
+		if (n < units)
+			goto overflow;
+	}
+
+	if (flags & NN_DIVISOR_1000)
+		divamt = 1000;
+
+	/*
+	 * This tries to find the suffix S(n) such that
+	 * S(n) <= n < S(n+1), where S(n) = 2^(n*10) | 10^(3*n)
+	 * (i.e. 1024/1000, 1,048,576/1,000,000, etc).  Stop once S(n)
+	 * is the largest prefix supported (i.e. don't bother computing
+	 * and checking S(n+1).  Since INDEX_MAX should be the largest
+	 * suffix that fits (currently an exabyte), S(INDEX_MAX + 1) is
+	 * never checked as it would overflow.
+	 */
+	while (index < INDEX_MAX) {
+		uint64_t newdiv = divisor * divamt;
+
+		/* CTASSERT() guarantee these never trip */
+		VERIFY3U(newdiv, >=, divamt);
+		VERIFY3U(newdiv, >=, divisor);
+
+		if (n < newdiv)
+			break;
+
+		divisor = newdiv;
+		index++;
+	}
+
+	u = " KMGTPE"[index];
+
+	if (index == 0) {
+		rc = snprintf(buf, buflen, "%llu", n);
+	} else if (n % divisor == 0) {
+		/*
+		 * If this is an even multiple of the base, always display
+		 * without any decimal precision.
+		 */
+		rc = snprintf(buf, buflen, "%llu%c", n / divisor, u);
+	} else {
+		/*
+		 * We want to choose a precision that reflects the best choice
+		 * for fitting in 5 characters.  This can get rather tricky
+		 * when we have numbers that are very close to an order of
+		 * magnitude.  For example, when displaying 10239 (which is
+		 * really 9.999K), we want only a single place of precision
+		 * for 10.0K.  We could develop some complex heuristics for
+		 * this, but it's much easier just to try each combination
+		 * in turn.
+		 */
+		int i;
+		for (i = 2; i >= 0; i--) {
+			if ((rc = snprintf(buf, buflen, "%.*f%c", i,
+			    (double)n / divisor, u)) <= 5)
+				break;
+		}
+	}
+
+	if (rc + 1 > buflen || rc < 0)
+		goto overflow;
+
+	return;
+
+overflow:
+	/* prefer a more verbose message if possible */
+	if (buflen > 10)
+		(void) strlcpy(buf, "<overflow>", buflen);
+	else
+		(void) strlcpy(buf, "??", buflen);
+}
+
+void
+nicenum(uint64_t num, char *buf, size_t buflen)
+{
+	nicenum_scale(num, 1, buf, buflen, 0);
+}

Modified: vendor/illumos/dist/lib/libzfs/common/libzfs_util.c
==============================================================================
--- vendor/illumos/dist/lib/libzfs/common/libzfs_util.c	Thu Oct 26 16:02:38 2017	(r325012)
+++ vendor/illumos/dist/lib/libzfs/common/libzfs_util.c	Thu Oct 26 16:20:47 2017	(r325013)
@@ -45,6 +45,7 @@
 #include <sys/mnttab.h>
 #include <sys/mntent.h>
 #include <sys/types.h>
+#include <libcmdutils.h>
 
 #include <libzfs.h>
 #include <libzfs_core.h>
@@ -572,42 +573,7 @@ zfs_strdup(libzfs_handle_t *hdl, const char *str)
 void
 zfs_nicenum(uint64_t num, char *buf, size_t buflen)
 {
-	uint64_t n = num;
-	int index = 0;
-	char u;
-
-	while (n >= 1024) {
-		n /= 1024;
-		index++;
-	}
-
-	u = " KMGTPE"[index];
-
-	if (index == 0) {
-		(void) snprintf(buf, buflen, "%llu", n);
-	} else if ((num & ((1ULL << 10 * index) - 1)) == 0) {
-		/*
-		 * If this is an even multiple of the base, always display
-		 * without any decimal precision.
-		 */
-		(void) snprintf(buf, buflen, "%llu%c", n, u);
-	} else {
-		/*
-		 * We want to choose a precision that reflects the best choice
-		 * for fitting in 5 characters.  This can get rather tricky when
-		 * we have numbers that are very close to an order of magnitude.
-		 * For example, when displaying 10239 (which is really 9.999K),
-		 * we want only a single place of precision for 10.0K.  We could
-		 * develop some complex heuristics for this, but it's much
-		 * easier just to try each combination in turn.
-		 */
-		int i;
-		for (i = 2; i >= 0; i--) {
-			if (snprintf(buf, buflen, "%.*f%c", i,
-			    (double)num / (1ULL << 10 * index), u) <= 5)
-				break;
-		}
-	}
+	nicenum(num, buf, buflen);
 }
 
 void

Modified: vendor/illumos/dist/lib/libzpool/common/sys/zfs_context.h
==============================================================================
--- vendor/illumos/dist/lib/libzpool/common/sys/zfs_context.h	Thu Oct 26 16:02:38 2017	(r325012)
+++ vendor/illumos/dist/lib/libzpool/common/sys/zfs_context.h	Thu Oct 26 16:20:47 2017	(r325013)
@@ -542,7 +542,7 @@ extern void kernel_init(int);
 extern void kernel_fini(void);
 
 struct spa;
-extern void nicenum(uint64_t num, char *buf);
+extern void nicenum(uint64_t num, char *buf, size_t);
 extern void show_pool_stats(struct spa *);
 extern int set_global_var(char *arg);
 

Modified: vendor/illumos/dist/lib/libzpool/common/util.c
==============================================================================
--- vendor/illumos/dist/lib/libzpool/common/util.c	Thu Oct 26 16:02:38 2017	(r325012)
+++ vendor/illumos/dist/lib/libzpool/common/util.c	Thu Oct 26 16:20:47 2017	(r325013)
@@ -38,33 +38,6 @@
  * Routines needed by more than one client of libzpool.
  */
 
-void
-nicenum(uint64_t num, char *buf)
-{
-	uint64_t n = num;
-	int index = 0;
-	char u;
-
-	while (n >= 1024) {
-		n = (n + (1024 / 2)) / 1024; /* Round up or down */
-		index++;
-	}
-
-	u = " KMGTPE"[index];
-
-	if (index == 0) {
-		(void) sprintf(buf, "%llu", (u_longlong_t)n);
-	} else if (n < 10 && (num & (num - 1)) != 0) {
-		(void) sprintf(buf, "%.2f%c",
-		    (double)num / (1ULL << 10 * index), u);
-	} else if (n < 100 && (num & (num - 1)) != 0) {
-		(void) sprintf(buf, "%.1f%c",
-		    (double)num / (1ULL << 10 * index), u);
-	} else {
-		(void) sprintf(buf, "%llu%c", (u_longlong_t)n, u);
-	}
-}
-
 static void
 show_vdev_stats(const char *desc, const char *ctype, nvlist_t *nv, int indent)
 {
@@ -97,15 +70,17 @@ show_vdev_stats(const char *desc, const char *ctype, n
 
 		sec = MAX(1, vs->vs_timestamp / NANOSEC);
 
-		nicenum(vs->vs_alloc, used);
-		nicenum(vs->vs_space - vs->vs_alloc, avail);
-		nicenum(vs->vs_ops[ZIO_TYPE_READ] / sec, rops);
-		nicenum(vs->vs_ops[ZIO_TYPE_WRITE] / sec, wops);
-		nicenum(vs->vs_bytes[ZIO_TYPE_READ] / sec, rbytes);
-		nicenum(vs->vs_bytes[ZIO_TYPE_WRITE] / sec, wbytes);
-		nicenum(vs->vs_read_errors, rerr);
-		nicenum(vs->vs_write_errors, werr);
-		nicenum(vs->vs_checksum_errors, cerr);
+		nicenum(vs->vs_alloc, used, sizeof (used));
+		nicenum(vs->vs_space - vs->vs_alloc, avail, sizeof (avail));
+		nicenum(vs->vs_ops[ZIO_TYPE_READ] / sec, rops, sizeof (rops));
+		nicenum(vs->vs_ops[ZIO_TYPE_WRITE] / sec, wops, sizeof (wops));
+		nicenum(vs->vs_bytes[ZIO_TYPE_READ] / sec, rbytes,
+		    sizeof (rbytes));
+		nicenum(vs->vs_bytes[ZIO_TYPE_WRITE] / sec, wbytes,
+		    sizeof (wbytes));
+		nicenum(vs->vs_read_errors, rerr, sizeof (rerr));
+		nicenum(vs->vs_write_errors, werr, sizeof (werr));
+		nicenum(vs->vs_checksum_errors, cerr, sizeof (cerr));
 
 		(void) printf("%*s%s%*s%*s%*s %5s %5s %5s %5s %5s %5s %5s\n",
 		    indent, "",



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