129 lines
4.4 KiB
Bash
Executable File
129 lines
4.4 KiB
Bash
Executable File
#!/bin/sh
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# Copyright (c) 2012-2019, Piotr Karbowski <piotr.karbowski@gmail.com>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification, are
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# permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice, this list
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# of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice, this list
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# of conditions and the following disclaimer in the documentation and/or other
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# materials provided with the distribution.
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# * Neither the name of the Piotr Karbowski nor the names of its contributors may be
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# used to endorse or promote products derived from this software without specific
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# prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE US
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# This script meant to create /dev/disk/by-* and /dev/mapper/* symlinks.
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# and remove them after storage device is removed.
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# the /dev/disk/by-* handling based on the idea and proof of concept from BitJam.
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# debug
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#exec >> /run/debug-mdev 2>&1
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#set -x
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#echo '### ENV:'
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#env
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#echo '### CODE:'
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#
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umask 077
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storage_dir="/dev/.mdev-like-a-boss"
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[ -d "${storage_dir}" ] || mkdir "${storage_dir}"
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[ "${MDEV}" ] || exit 2
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create_uuid_label_symlink() {
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local target_dir="/dev/disk/by-${1}"
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local target_symlink="${target_dir}/${2}"
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[ -e "${target_symlink}" ] && return
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mkdir -p "${target_dir}"
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ln -snf "/dev/${MDEV}" "${target_symlink}"
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echo "${target_symlink}" >"${storage_dir}/storage_symlink_${1}_${MDEV}"
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}
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add_symlinks() {
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# Skip temp cryptsetup nodes.
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case "${MDEV}" in
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'dm-'[0-9]*)
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case "$(cat "/sys/block/${MDEV}/dm/name")" in
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'temporary-cryptsetup-'[0-9]*)
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return 0
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;;
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esac
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;;
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esac
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if command -v blkid >/dev/null 2>&1; then
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local field name value UUID LABEL TYPE PTTYPE PARTUUID
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local blkid_output="$(blkid "/dev/${MDEV}")"
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eval "${blkid_output#*: }"
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[ "${UUID}" ] && create_uuid_label_symlink 'uuid' "${UUID}"
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[ "${LABEL}" ] && create_uuid_label_symlink 'label' "${LABEL}"
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[ "${PARTUUID}" ] && create_uuid_label_symlink 'partuuid' "${PARTUUID}"
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fi
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if [ -f "/sys/block/${MDEV}/dm/name" ]; then
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[ -d '/dev/mapper' ] || mkdir '/dev/mapper'
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if ! [ -c '/dev/mapper/control' ]; then
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awk '$2 == "device-mapper" { foo = system("mknod /dev/mapper/control c 10 " $1); exit foo }' /proc/misc || exit 1
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fi
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local dmname="$(cat "/sys/block/${MDEV}/dm/name")"
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if [ "${dmname}" ]; then
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local target_symlink="/dev/mapper/${dmname}"
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[ -e "${target_symlink}" ] && return
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ln -snf "/dev/${MDEV}" "${target_symlink}"
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echo "${target_symlink}" >"${storage_dir}/storage_symlink_mapper_${MDEV}"
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fi
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fi
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}
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set_readahead() {
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read_ahead_kb_control="/sys/class/block/${MDEV}/queue/read_ahead_kb"
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new_read_ahead_kb="2048"
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if [ -f "${read_ahead_kb_control}" ]; then
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read_ahead_kb="$(cat "${read_ahead_kb_control}")"
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if [ "${read_ahead_kb}" -lt "${new_read_ahead_kb}" ]; then
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logger -t mdev "Changing ${MDEV} read_ahead_kb from ${read_ahead_kb} to ${new_read_ahead_kb}"
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echo -n "${new_read_ahead_kb}" >"${read_ahead_kb_control}"
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fi
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fi
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}
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drop_symlinks() {
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local type
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for type in uuid label mapper; do
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[ -f "${storage_dir}/storage_symlink_${type}_${MDEV}" ] || continue
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local target_symlink="$(cat "${storage_dir}/storage_symlink_${type}_${MDEV}" 2>/dev/null)"
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[ "${target_symlink}" ] || continue
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local target_symlink_device="$(readlink "${target_symlink}")"
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if [ "${target_symlink_device}" = "/dev/${MDEV}" ]; then
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rm "${target_symlink}"
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fi
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rm "${storage_dir}/storage_symlink_${type}_${MDEV}"
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done
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}
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case "${ACTION}" in
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'add'|'')
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add_symlinks
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set_readahead
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;;
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'remove')
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drop_symlinks
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;;
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esac
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