ZTS: Simplify zpool_initialize_verify_initialized

Consider the test to be a success as long as the initializing pattern
is found at least once per metaslab.  This indicates that at least
part of the free space was initialized.  Ideally we'd check that the
pattern was written to all free space but that's much tricker so this
check is a reasonable compromise.

Using a here-string to feed the loop in this test causes an empty
string to still trigger the loop so we miss the `spacemaps=0` case.
Pipe into the loop instead.

While here, we can use `zpool wait -t initialize $TESTPOOL` to wait for
the pool to initialize.

Co-authored-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>

tests/zfs-tests/tests/functional/cli_root/zpool_initialize/zpool_initialize_verify_initialized.ksh

@@ -24,7 +24,6 @@
 # Copyright (c) 2016 by Delphix. All rights reserved.
 #
 . $STF_SUITE/include/libtest.shlib
-. $STF_SUITE/tests/functional/cli_root/zpool_initialize/zpool_initialize.kshlib
 
 #
 # DESCRIPTION:
@@ -33,8 +32,8 @@
 # STRATEGY:
 # 1. Create a one-disk pool.
 # 2. Initialize the disk to completion.
-# 3. Load all metaslabs that don't have a spacemap, and make sure the entire
-#    metaslab has been filled with the initializing pattern (deadbeef).
+# 3. Load all metaslabs and make sure that each contains at least
+#    once instance of the initializing pattern (deadbeef).
 #
 
 function cleanup
@@ -58,32 +57,34 @@ ORIG_PATTERN=$(get_tunable INITIALIZE_VALUE)
 log_must set_tunable64 INITIALIZE_VALUE $(printf %llu 0x$PATTERN)
 
 log_must mkdir "$TESTDIR"
-log_must mkfile $MINVDEVSIZE "$SMALLFILE"
+log_must truncate -s $MINVDEVSIZE "$SMALLFILE"
 log_must zpool create $TESTPOOL "$SMALLFILE"
-log_must zpool initialize $TESTPOOL
-
-while [[ "$(initialize_progress $TESTPOOL $SMALLFILE)" -lt "100" ]]; do
-        sleep 0.5
-done
-
+log_must zpool initialize -w $TESTPOOL
 log_must zpool export $TESTPOOL
 
-spacemaps=0
+metaslabs=0
 bs=512
-while read -r sm; do
-        typeset offset="$(echo $sm | cut -d ' ' -f1)"
-        typeset size="$(echo $sm | cut -d ' ' -f2)"
+zdb -p $TESTDIR -Pme $TESTPOOL | awk '/metaslab[ ]+[0-9]+/ { print $4, $8 }' |
+while read -r offset_size; do
+	typeset offset=$(echo $offset_size | cut -d ' ' -f1)
+	typeset size=$(echo $offset_size | cut -d ' ' -f2)
 
-	spacemaps=$((spacemaps + 1))
-        offset=$(((4 * 1024 * 1024) + 16#$offset))
-	out=$(dd if=$SMALLFILE skip=$(($offset / $bs)) \
-	    count=$(($size / $bs)) bs=$bs 2>/dev/null | od -t x8 -Ad)
-	echo "$out" | log_must egrep "$PATTERN|\*|$size"
-done <<< "$(zdb -p $TESTDIR -Pme $TESTPOOL | egrep 'spacemap[ ]+0 ' | \
-    awk '{print $4, $8}')"
+	log_note "offset: '$offset'"
+	log_note "size: '$size'"
+
+	metaslabs=$((metaslabs + 1))
+	offset=$(((4 * 1024 * 1024) + 16#$offset))
+	log_note "vdev file offset: '$offset'"
+
+	# Note we use '-t x4' instead of '-t x8' here because x8 is not
+	# a supported format on FreeBSD.
+	dd if=$SMALLFILE skip=$((offset / bs)) count=$((size / bs)) bs=$bs |
+	    od -t x4 -Ad | egrep -q "deadbeef +deadbeef +deadbeef +deadbeef" ||
+	    log_fail "Pattern not found in metaslab free space"
+done
 
-if [[ $spacemaps -eq 0 ]];then
-	log_fail "Did not find any empty space maps to check"
+if [[ $metaslabs -eq 0 ]]; then
+	log_fail "Did not find any metaslabs to check"
 else
-	log_pass "Initializing wrote appropriate amount to disk"
+	log_pass "Initializing wrote to each metaslab"
 fi