ZTS: Output all block copies in list_file_blocks

The second part of list_file_blocks transforms the object description
output by zdb -ddddd $ds $objnum into a stream of lines of the form
"level path offset length" for the indirect blocks in the given file.
The current code only works for the first copy of L0 blocks.  L1 and
L2 indirect blocks have more than one copy on disk.

Add one more -d to the zdb command so we get all block copies and
rewrite the transformation to match more than L0 and output all DVAs.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11141

tests/zfs-tests/include/blkdev.shlib

@@ -586,20 +586,37 @@ function list_file_blocks # input_file
 	# two are converted to decimal in the while loop. 4M is added to
 	# the offset to compensate for the first two labels and boot
 	# block. Lastly, the offset and length are printed in units of
-	# 512b blocks for ease of use with dd.
+	# 512B blocks for ease of use with dd.
 	#
+	typeset level vdev path offset length
+	if awk -n '' 2>/dev/null; then
+		# gawk needs -n to decode hex
+		AWK='awk -n'
+	else
+		AWK='awk'
+	fi
 	log_must zpool sync -f
-	typeset level path offset length
-	zdb -ddddd $ds $objnum | awk -F: '
+	zdb -dddddd $ds $objnum | $AWK -v pad=$((4<<20)) -v bs=512 '
+	    /^$/ { looking = 0 }
+	    looking {
+	        level = $2
+	        field = 3
+	        while (split($field, dva, ":") == 3) {
+	            # top level vdev id
+	            vdev = int(dva[1])
+	            # offset + 4M label/boot pad in 512B blocks
+	            offset = (int("0x"dva[2]) + pad) / bs
+		    # length in 512B blocks
+		    len = int("0x"dva[3]) / bs
+
+	            print level, vdev, offset, len
+
+	            ++field
+	        }
+	    }
 	    /^Indirect blocks:/ { looking = 1 }
-	    /^\t\tsegment / { looking = 0 }
-	    /L[0-8]/ && looking { print }
-	' | sed -n 's/^.*\(L[0-9]\) *\([0-9]*\):\([0-9a-f]*\):\([0-9a-f]*\) .*$/\1 \2 \3 \4/p' | \
+	' | \
 	while read level vdev offset length; do
-		offset=$((16#$offset))  # Conversion from hex
-		length=$((16#$length))
-		offset="$(((offset + 4 * 1024 * 1024) / 512))"
-		length="$((length / 512))"
 		for path in ${VDEV_MAP[$vdev][@]}; do
 			echo "$level $path $offset $length"
 		done