+}
+
+function get_snaptype {
+ local fstype="$1" dump="$2"
+ if [ "$dump" = "1" ]; then
+ echo bind
+ elif [ "$dump" = "2" ] && [ "$fstype" = "btrfs" ]; then
+ echo btrfs
+ elif [ "$dump" = "2" ]; then
+ echo lvm
+ fi
+}
+
+function snap_bind {
+ local mnt="$2"
+ mount --bind "${mnt}" "/a${mnt}"
+}
+
+function unsnap_bind {
+ local snapmnt="/a$2"
+ if mountpoint -q "$snapmnt"; then
+ umount "$snapmnt"
+ fi
+}
+
+function snap_lvm {
+ local dev="$1" mnt="$2"
+ local lvname="" vgname=""
+ read -r lvname vgname _ < <(lvdisplay --noheadings -C "$dev")
+ echo "snapshot ${vgname}/${lvname}"
+ lvcreate -L1G --snapshot --name "${lvname}snap" "${vgname}/${lvname}"
+ mount -o ro "${dev}snap" "/a${mnt}"
+}
+
+function unsnap_lvm {
+ local snapdev="${1}snap"
+ local snapmnt="/a$2"
+ if mountpoint -q "$snapmnt"; then
+ umount "$snapmnt"
+ fi
+ if [ -b "$(readlink -f "$snapdev")" ]; then
+ lvremove -f "${dev}snap"
+ fi
+}
+
+function snap_btrfs {
+ local mnt="$2" opts="$3" snapdir=""
+
+ snapdir="$(get_btrfs_snapshot_dir "$opts" "$mnt")"
+ btrfs subvolume snapshot "$mnt" "$snapdir"
+
+ mount --bind "$snapdir" "/a${mnt}"
+}
+
+function unsnap_btrfs {
+ local mnt="$2" opts="$3" snapdir=""
+
+ local snapmnt="/a$2"
+ if mountpoint -q "$snapmnt"; then
+ umount "$snapmnt"
+ fi
+
+ snapdir="$(get_btrfs_snapshot_dir "$opts" "$mnt")"
+ if [ -d "$snapdir" ]; then
+ btrfs subvolume delete "$snapdir"
+ fi
+}