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#!/bin/bash

mnt=/mnt/sdd
dev=/dev/sdd

umount $dev &> /dev/null
mkfs.btrfs -f -n 4096 $dev
mount $dev $mnt

echo -e "Filling fs...\n"

# Ensure we get the fs tree with 3+ levels.
xattr_val=$(printf '%0.sX' $(seq 1 3850))
for ((i = 1; i <= 10000; i++)); do
        echo -n > $mnt/filler_$i
        setfattr -n user.x1 -v $xattr_val $mnt/filler_$i
done

xfs_io -f -c "pwrite 0 128K" $mnt/foobar

# Creating snapshots..."
for ((i = 1; i <= 1000; i++)); do
        btrfs subvolume snapshot -r $mnt $mnt/snap_$i
done

extent_bytenr=$(btrfs inspect-internal dump-tree -t 5 $dev | egrep -A 2 EXTENT_DATA | perl -ne 'print $1 if /disk byte (\d+)/')
echo -e "\nExtent location at disk bytenr $extent_bytenr\n"

ts_before=$(date +%s)
btrfs inspect-internal logical-resolve -P $extent_bytenr $mnt | wc -l
ts_after=$(date +%s)
echo -e "\nlogical-resolve took $((ts_after - ts_before)) seconds\n"

ts_before=$(date +%s)
btrfs send -f /dev/null $mnt/snap_1
ts_after=$(date +%s)
echo -e "\nsend took $((ts_after - ts_before)) seconds\n"