On Wed, Feb 24, 2016 at 04:06:35PM +0800, Qu Wenruo wrote:

+# File size is twice the maximum file extent of btrfs
+# So even fallbacked to non-dedup, it will have at least 2 extents
+file_size=$(( 256 * 1024 * 1024 ))
+dedup_bs=$(( 64 * 1024 ))

256m, 64k.

+_scratch_mkfs "-O dedup" >> $seqres.full 2>&1
+_scratch_mount
+
+# Return 0 for not deduped at all , return 1 for part or full deduped
+test_file_deduped () {
+	file=$1
+

echo -n "$file: "

+	nr_uniq_extents=$(_uniq_extent_count $file)
+	nr_total_extents=$(_extent_count $file)
+
+	if [ $nr_uniq_extents -eq $nr_total_extents ]; then
+		echo "not de-duplicated"
+	else
+		echo "de-duplicated"
+	fi

+}
+
+dedup_write_file () {
+	file=$1
+	size=$2
+
+	$XFS_IO_PROG -f -c "pwrite -b $dedup_bs 0 $size" $file | _filter_xfs_io
+}
+
+print_result () {
+	file=$1
+
+	echo "$(basename $file): $(test_file_deduped $file)"
+}
+_run_btrfs_util_prog dedup enable -b $dedup_bs $SCRATCH_MNT
+touch $SCRATCH_MNT/dedup_file
+touch $SCRATCH_MNT/no_dedup_file
+mkdir $SCRATCH_MNT/dedup_dir
+mkdir $SCRATCH_MNT/no_dedup_dir
+
+_run_btrfs_util_prog property set $SCRATCH_MNT/no_dedup_file dedup disable
+_run_btrfs_util_prog property set $SCRATCH_MNT/no_dedup_dir dedup disable
+
+dedup_write_file $SCRATCH_MNT/tmp $dedup_bs

Just call xfs_io directly - wrapper is not necessary for a single
line command.

+# sync to ensure hash is added to dedup tree
+sync
+
+dedup_write_file $SCRATCH_MNT/dedup_file $file_size
+dedup_write_file $SCRATCH_MNT/no_dedup_file $file_size
+dedup_write_file $SCRATCH_MNT/dedup_dir/dedup_dir_default_file $file_size
+dedup_write_file $SCRATCH_MNT/no_dedup_dir/no_dedup_dir_default_file $file_size
+
+print_result $SCRATCH_MNT/dedup_file

test_file_deduped $SCRATCH_MNT/dedup_file | _filter_scratch

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com