134 lines
4.7 KiB
Bash
Executable File
134 lines
4.7 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="/tmp/.mdev-like-a-boss"
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[ -d "$storage_dir" ] || mkdir "$storage_dir"
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[ "$MDEV" ] || exit 2
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create_uuid_label_symlink() {
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target_dir="/dev/disk/by-${1}"
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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 -sf "/dev/${MDEV}" "$target_symlink"
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printf "%s\n" "$target_symlink" > "${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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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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while read -r dm; do
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[ "${dm#* }" = device-mapper ] && {
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mknod /dev/mapper/control c 10 "${dm% *}" || exit 1
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break
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}
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done < /proc/misc
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fi
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dmname=$(cat "/sys/block/${MDEV}/dm/name")
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if [ "$dmname" ]; then
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target_symlink="/dev/mapper/${dmname}"
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[ -e "$target_symlink" ] && return
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ln -sf "/dev/${MDEV}" "$target_symlink"
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printf "%s\n" "$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 $new_read_ahead_kb"
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printf "%s" "$new_read_ahead_kb" > "$read_ahead_kb_control"
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fi
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fi
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}
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drop_symlinks() {
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for type in uuid label mapper; do
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[ -f "${storage_dir}/storage_symlink_${type}_${MDEV}" ] || continue
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target_symlink=$(cat "${storage_dir}/storage_symlink_${type}_${MDEV}" 2> /dev/null)
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[ "$target_symlink" ] || continue
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target_symlink_device=$(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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