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refactor storage-device

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This commit is contained in:
illiliti 2020-02-13 22:49:51 +03:00
parent 640ff670cf
commit 34f5adb14c
2 changed files with 76 additions and 70 deletions
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2
README.md
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@ -43,5 +43,5 @@ Exceptions:
The "mdev.conf" configuration file is modified version from "mdev-like-a-boss" project, Copyright (c) 2012-2020, Piotr Karbowski <piotr.karbowski@gmail.com>.
Please consult the license notice in the file for terms and conditions.
The "storage-device" script from "mdev-like-a-boss" project, Copyright (c) 2012-2020, Piotr Karbowski <piotr.karbowski@gmail.com>.
The "storage-device" script is modified version from "mdev-like-a-boss" project, Copyright (c) 2012-2020, Piotr Karbowski <piotr.karbowski@gmail.com>.
Please consult the license notice in the file for terms and conditions.

144
storage-device
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@ -38,91 +38,97 @@
umask 077
storage_dir="/dev/.mdev-like-a-boss"
[ -d "${storage_dir}" ] || mkdir "${storage_dir}"
# TODO use /tmp
storage_dir="/tmp/.mdev-like-a-boss"
[ -d "$storage_dir" ] || mkdir "$storage_dir"
[ "${MDEV}" ] || exit 2
[ "$MDEV" ] || exit 2
create_uuid_label_symlink() {
local target_dir="/dev/disk/by-${1}"
local target_symlink="${target_dir}/${2}"
[ -e "${target_symlink}" ] && return
mkdir -p "${target_dir}"
ln -snf "/dev/${MDEV}" "${target_symlink}"
echo "${target_symlink}" >"${storage_dir}/storage_symlink_${1}_${MDEV}"
target_dir="/dev/disk/by-${1}"
target_symlink="${target_dir}/${2}"
[ -e "$target_symlink" ] && return
mkdir -p "$target_dir"
ln -sf "/dev/${MDEV}" "$target_symlink"
printf "%s\n" "$target_symlink" > "${storage_dir}/storage_symlink_${1}_${MDEV}"
}
add_symlinks() {
# Skip temp cryptsetup nodes.
case "${MDEV}" in
'dm-'[0-9]*)
case "$(cat "/sys/block/${MDEV}/dm/name")" in
'temporary-cryptsetup-'[0-9]*)
return 0
;;
esac
;;
esac
# Skip temp cryptsetup nodes.
case "$MDEV" in
"dm-"[0-9]*)
case "$(cat "/sys/block/${MDEV}/dm/name")" in
"temporary-cryptsetup-"[0-9]*)
return 0
;;
esac
;;
esac
if command -v blkid >/dev/null 2>&1; then
local field name value UUID LABEL TYPE PTTYPE PARTUUID
local blkid_output="$(blkid "/dev/${MDEV}")"
eval "${blkid_output#*: }"
if command -v blkid > /dev/null 2>&1; then
blkid_output=$(blkid "/dev/${MDEV}")
eval "${blkid_output#*: }"
[ "${UUID}" ] && create_uuid_label_symlink 'uuid' "${UUID}"
[ "${LABEL}" ] && create_uuid_label_symlink 'label' "${LABEL}"
[ "${PARTUUID}" ] && create_uuid_label_symlink 'partuuid' "${PARTUUID}"
fi
[ "$UUID" ] && create_uuid_label_symlink uuid "$UUID"
[ "$LABEL" ] && create_uuid_label_symlink label "$LABEL"
[ "$PARTUUID" ] && create_uuid_label_symlink partuuid "$PARTUUID"
fi
if [ -f "/sys/block/${MDEV}/dm/name" ]; then
[ -d '/dev/mapper' ] || mkdir '/dev/mapper'
if ! [ -c '/dev/mapper/control' ]; then
awk '$2 == "device-mapper" { foo = system("mknod /dev/mapper/control c 10 " $1); exit foo }' /proc/misc || exit 1
fi
local dmname="$(cat "/sys/block/${MDEV}/dm/name")"
if [ "${dmname}" ]; then
local target_symlink="/dev/mapper/${dmname}"
[ -e "${target_symlink}" ] && return
ln -snf "/dev/${MDEV}" "${target_symlink}"
echo "${target_symlink}" >"${storage_dir}/storage_symlink_mapper_${MDEV}"
fi
fi
if [ -f "/sys/block/${MDEV}/dm/name" ]; then
[ -d /dev/mapper ] || mkdir /dev/mapper
if ! [ -c /dev/mapper/control ]; then
#awk '$2 == "device-mapper" { foo = system("mknod /dev/mapper/control c 10 " $1); exit foo }' /proc/misc || exit 1
while read -r dm; do
[ "${dm#* }" = device-mapper ] && {
mknod /dev/mapper/control c 10 "${dm% *}" || exit 1
}
done < /proc/misc
fi
dmname=$(cat "/sys/block/${MDEV}/dm/name")
if [ "$dmname" ]; then
target_symlink="/dev/mapper/${dmname}"
[ -e "$target_symlink" ] && return
ln -sf "/dev/${MDEV}" "$target_symlink"
printf "%s\n" "$target_symlink" > "${storage_dir}/storage_symlink_mapper_${MDEV}"
fi
fi
}
set_readahead() {
read_ahead_kb_control="/sys/class/block/${MDEV}/queue/read_ahead_kb"
new_read_ahead_kb="2048"
if [ -f "${read_ahead_kb_control}" ]; then
read_ahead_kb="$(cat "${read_ahead_kb_control}")"
if [ "${read_ahead_kb}" -lt "${new_read_ahead_kb}" ]; then
logger -t mdev "Changing ${MDEV} read_ahead_kb from ${read_ahead_kb} to ${new_read_ahead_kb}"
echo -n "${new_read_ahead_kb}" >"${read_ahead_kb_control}"
fi
fi
read_ahead_kb_control="/sys/class/block/${MDEV}/queue/read_ahead_kb"
new_read_ahead_kb="2048"
if [ -f "$read_ahead_kb_control" ]; then
read_ahead_kb=$(cat "$read_ahead_kb_control")
if [ "$read_ahead_kb" -lt "$new_read_ahead_kb" ]; then
logger -t mdev "Changing $MDEV read_ahead_kb from $read_ahead_kb to $new_read_ahead_kb"
printf "%s" "$new_read_ahead_kb" > "$read_ahead_kb_control"
fi
fi
}
drop_symlinks() {
local type
for type in uuid label mapper; do
[ -f "${storage_dir}/storage_symlink_${type}_${MDEV}" ] || continue
local target_symlink="$(cat "${storage_dir}/storage_symlink_${type}_${MDEV}" 2>/dev/null)"
[ "${target_symlink}" ] || continue
for type in uuid label mapper; do
[ -f "${storage_dir}/storage_symlink_${type}_${MDEV}" ] || continue
target_symlink=$(cat "${storage_dir}/storage_symlink_${type}_${MDEV}" 2> /dev/null)
[ "$target_symlink" ] || continue
local target_symlink_device="$(readlink "${target_symlink}")"
if [ "${target_symlink_device}" = "/dev/${MDEV}" ]; then
rm "${target_symlink}"
fi
rm "${storage_dir}/storage_symlink_${type}_${MDEV}"
done
target_symlink_device=$(readlink "$target_symlink")
if [ "$target_symlink_device" = "/dev/${MDEV}" ]; then
rm "$target_symlink"
fi
rm "${storage_dir}/storage_symlink_${type}_${MDEV}"
done
}
case "${ACTION}" in
'add'|'')
add_symlinks
set_readahead
;;
'remove')
drop_symlinks
;;
case "$ACTION" in
add | "")
add_symlinks
set_readahead
;;
remove)
drop_symlinks
;;
esac