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author | Jonathan Bauer | 2020-05-13 11:04:02 +0200 |
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committer | Jonathan Bauer | 2020-05-13 11:04:02 +0200 |
commit | 1130873aa55c9b0a7e5af48edc44bd6c6fd1f888 (patch) | |
tree | 0fcfa186cd631d8d36611b3d4bc509fd38841d51 /builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device | |
parent | Merge branch 'centos8' into downloader (diff) | |
download | systemd-init-1130873aa55c9b0a7e5af48edc44bd6c6fd1f888.tar.gz systemd-init-1130873aa55c9b0a7e5af48edc44bd6c6fd1f888.tar.xz systemd-init-1130873aa55c9b0a7e5af48edc44bd6c6fd1f888.zip |
restructure repo
* remove packager
* move everything from builder/* back to root
Diffstat (limited to 'builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device')
-rwxr-xr-x | builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device | 446 |
1 files changed, 0 insertions, 446 deletions
diff --git a/builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device b/builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device deleted file mode 100755 index 1756865e..00000000 --- a/builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device +++ /dev/null @@ -1,446 +0,0 @@ -#!/usr/bin/env bash -# -# Script to back given read-only device using the block device -# specified by SLX_WRITABLE_DEVICE_IDENTIFIER in the SLX config. -# If SLX_WRITABLE_DEVICE_PARTITION_TABLE is sepcified, it will -# further create device mapper devices accordingly. -# -# Example partition config: -# <type> <name> <size> <crypt> -# thin-snapshot root 10G 1 -# thin-volume tmp 20G 0 -# linear data0 5-10G 1 -# linear data1 1-50% 1 -# -# NOTE: Encrypting thin-snapshot will actually encrypt the -# entire pool data device used for the pool. -# TODO: Support external keys - -type -p emergency_shell || . /lib/dracut-lib.sh - -# for debugging purposes -set -x -exec &> /run/openslx/dmsetup.log - -# read-only device to prepare for CoW -[ -z "$1" ] && emergency_shell "Read-only device was not given!" -declare -rg read_only_device="$1" -declare -rg read_only_device_size="$(blockdev --getsz $1)" - -# global array variables storing the configuration of the partitions -declare -ag linear snapshot thin_snapshot thin_volume -parse_config() { - [ -z "$1" ] && return 1 - while IFS= read -r line; do - [ -z "$line" ] && continue - read -r type name range crypt ignore <<< "$line" - type=${type//-/_} # to use the type as variable in eval - if ! [[ "$type" =~ \ - ^(linear|snapshot|thin_snapshot|thin_volume)$ ]]; then - echo "$0: Ignoring invalid type: $line" - continue - fi - if [[ -z "$name" ]]; then - echo "$0: Ignoring nameless entry: $line" - continue - fi - unset unit min max - # ranges can be like: 40G, 40-80G, 10-20% - if ! [[ $range =~ ^([0-9]+-)*([0-9])+[GgMmKkBb%]$ ]]; then - echo "$0: Ignoring invalid range: $line" - continue - fi - # process ranges: convert percentages (of read_only_device!) - # to actual sizes (in sectors!) before saving them - local unit=${range: -1} - local min="$(cut -d'-' -f1 <<< "${range%?}" )" - local max="$(cut -d'-' -f2 <<< "${range%?}" )" - if [ "$min" -gt "$max" ]; then - echo "$0: Ignoring invalid range: $line" - continue - fi - # default for bytes - local -i potency=0 - case "$unit" in - [%]) - if [ "$max" -gt 100 ]; then - echo "Ignoring invalid percentages: $min/$max" - continue - fi - min=$(( $writable_device_size * $min / 100 )) - max=$(( $writable_device_size * $max / 100 )) - ;; - [Kk]) potency=1 ;;& - [Mm]) potency=2 ;;& - [Gg]) potency=3 ;;& - *) - # => 1024 ** potency for G, M, K, etc results in bytes - # => bytes / 512 = sectors - min=$(( $min * ( 1024 ** $potency) / 512 )) - max=$(( $max * ( 1024 ** $potency) / 512 )) - ;; - esac - if ! [[ "$crypt" =~ ^[01]$ ]]; then - echo "$0: Disabling encryption due to invalid crypt argument: $line" - crypt=0 - fi - # finally save it to the global array for this type - eval "${type}"'+=("'${name} ${crypt} ${min} ${max}'")' - done <<< "$1" -} - -# Helper to call 'dmsetup setup' without syncing with udev -# and then actively create the devices with the mknodes command. -# dmsetup_create_noudevsync <name> <table> -dmsetup_create_noudevsync() { - ( - set -o errexit - dmsetup create "$1" --noudevsync --table "$2" - dmsetup mknodes --noudevsync "$1" - ) - local ret=$? - [ $ret -ne 0 ] && dmsetup remove --noudevsync "$1" - return $ret -} - -# encrypt_device <dev_path> <encrypted_name> [<size>] -encrypt_device() { - modprobe dm-crypt || echo "$0: dm-crypt loading failed, maybe builtin?" - [ -b "$1" ] || return 1 - [ -n "$2" ] || return 1 - [ -z "$3" ] && local size="$(blockdev --getsz $1)" - local key="$(head -c32 /dev/random | xxd -p | tr -d '\n')" - if ! dmsetup_create_noudevsync "$2" \ - "0 ${3:-${size}} crypt aes-xts-plain64 $key 0 $1 0 1 allow_discards"; then - echo "$0: Failed to encrypt $1." - return 1 - fi - return 0 -} -# create_snapshot "<name> <persist>" -create_snapshot() { - modprobe dm-snapshot || echo "$0: dm-snapshot loading failed, maybe builtin?" - read -r name persist ignore <<< "$1" - if ! dmsetup_create_noudevsync "$name" \ - "0 $read_only_device_size snapshot $read_only_device $writable_device ${persist:-N} 8"; then - echo "$0: Failed to create snapshot on '$writable_device' for '$read_only_device'." - return 1 - fi - return 0 -} - -# Call this to fallback to a RAMdisk stored under /run/openslx -# This will call terminate the whole script by calling finish_setup, if successful -ramdisk_fallback() { - echo "$0: Falling back to regular dm-snapshot on a RAMdisk." - local file="$(mktemp -u -p /run/openslx dnbd_cow.XXX)" - local size="$SLX_RAMDISK_SIZE_IN_MB" - [ -z "$size" ] && size="$(awk '/MemTotal/ {printf("%d\n", $2 / 2 / 1024 )}' /proc/meminfo)" - dd of="$file" seek="$size" bs=1M count=0 &> /dev/null - writable_device="$(losetup --show --find "$file")" - cow_device_candidate="root" - while [ -b "/dev/mapper/$cow_device_candidate" ]; do - cow_device_candidate="root.$RANDOM" - done - if [ -z "$writable_device" ] || ! create_snapshot "$cow_device_candidate N"; then - emergency_shell "CRITICAL: failed to setup RAMdisk fallback." - exit 1 - fi - finish_setup "$cow_device_candidate" "0" "$size" -} - -# finish_setup <device> <type> [<size>] -# <device> is the device name only, /dev/mapper will be prepended automatically. -# <type> denotes if the created device lies in a RAMdisk (0) or is backed by a disk (1). -# <size> is given in sectors. -finish_setup() { - if [ -z "$1" ] || [ ! -b "/dev/mapper/$1" ]; then - emergency_shell "'/dev/mapper/$1' not a block device. Failed to setup CoW layer." - exit 1 - fi - if ! [[ "$2" =~ ^[0-9]$ ]]; then - emergency_shell "'$2' not a valid type, 0 or 1 expected." - fi - # <size> optional? - ( - echo "# Generated by '$0'." - echo "SLX_DNBD3_DEVICE_COW=/dev/mapper/$1" - ) >> /etc/openslx - save_partition_info "$1" "/" "$2" "$3" - exit 0 -} - -# path to save the achieved setup to -declare -rg partitions_config="/run/openslx/dmsetup.state" -cat <<-EOF > "$partitions_config" -# Generated by '$0'. -# Format: <device_mapper_dev> <mount_point> <options> -# Options can be: -# * type -> CoW layer type: 0 is RAMdisk, 1 is disk, 2 is network -# * size -> in 512 byte sectors -EOF - -# save_partition_info <dm_dev> <mount_point> <type> [<size>] -save_partition_info() { - [ -b "/dev/mapper/$1" ] || return 1 - [ -n "$2" ] || return 1 - [[ "$3" =~ ^[0-9]$ ]] || return 1 - local opts="type=$3" - # plain size given - [[ "$4" =~ ^[0-9]+$ ]] && opts="$opts,physical_size=$4" - # <physical_backing_dev_size>-<virtual_size> - [[ "$4" =~ ^[0-9]+-[0-9]+$ ]] && opts="$opts,shared_physical_size=${4%-*},virtual_size=${4#*-}" - echo "/dev/mapper/$1 $2 ${opts}" >> "$partitions_config" -} - -### -## MAIN -### - -. /etc/openslx -# This is the main variable driving this script -declare -g writable_device= -if [ -n "$SLX_WRITABLE_DEVICE_IDENTIFIER" ]; then - # only first one for now TODO create linear devices of all ID44s - writable_device="$(slx-tools dev_find_partitions "$SLX_WRITABLE_DEVICE_IDENTIFIER" | head -n 1)" -fi -if [ -z "$writable_device" ]; then - echo "$0: Could not find writable device with id '$SLX_WRITABLE_DEVICE_IDENTIFIER'." - ramdisk_fallback -fi - -# NOTE: from here on out, every value related to size is in 512 bytes sectors! -declare -g writable_device_size="$(blockdev --getsz $writable_device)" - -# If SLX_WRITABLE_DEVICE_PARTITION_TABLE is not set, just do -# regular thin-snapshot for the CoW layer, else parse it. -if [ -n "$SLX_WRITABLE_DEVICE_PARTITION_TABLE" ]; then - parse_config "$SLX_WRITABLE_DEVICE_PARTITION_TABLE" -fi -# Default to thin-snapshot, if none were configured -if [ -z "$snapshot" ] && [ -z "$thin_snapshot" ]; then - parse_config "thin-snapshot root 100% 0" -fi - -# Sanity checks for weird configurations -if [ "${#snapshot[@]}" -gt 1 ]; then - echo "Multiple snapshots specified, using first one: ${snapshot[0]}" - snapshot="${snapshot[0]}" -fi -if [ "${#thin_snapshot[@]}" -gt 1 ]; then - echo "Multiple thin-snapshots specified, using first one: ${thin_snapshot[0]}" - thin_snapshot="${thin_snapshot[0]}" -fi -if [ -n "$snapshot" ] && [ -n "$thin_snapshot" ]; then - echo "$0: Both snapshot and thin-snapshot specified, prefering thin-snapshot." - snapshot= -fi - -### -## LINEAR SLICES -### - -# start allocating spaces to the configured devices -declare -g writable_device_allocated=0 -# reserve the space for the snapshot (of either type)... -read -r name crypt min max ignore <<< "${thin_snapshot:-${snapshot}}" - -declare -g scratch_device_size=0 -if (( $min <= $writable_device_size )); then - scratch_device_size=$max - while (( $scratch_device_size >= 0 )) && (( $scratch_device_size > $writable_device_size )); do - (( scratch_device_size -= 2097152 )) # 1G steps => 2097152 sectors - done - (( $scratch_device_size < $min )) && scratch_device_size="$min" -else - # minimum snapshot size is bigger than physical device size - echo "$0: Minimum snapshot size is too big for the scratch partition." - echo "$0: You probably need to use a more conservative value." - echo "$0: Using this client maximum scratch space ($writable_device_size sectors)." - scratch_device_size="$writable_device_size" -fi - -# ... and slice it from the start of the writable device (for performance). -declare -g scratch_device="/dev/mapper/scratch" -if ! dmsetup_create_noudevsync "${scratch_device##*/}" \ - "0 $scratch_device_size linear $writable_device $writable_device_allocated"; then - echo "$0: Failed to create scratch space for the CoW layer." - # TODO do not bail directly, but try to to create the linear devices at least? - ramdisk_fallback -fi -save_partition_info "${scratch_device##*/}" "*" "1" "$scratch_device_size" - -# encrypt the scratch device, if configured -if [ "$crypt" -ne 0 ] && encrypt_device \ - "$scratch_device" "${scratch_device##*/}-crypt" "$scratch_device_size"; then - scratch_device="${scratch_device}-crypt" -fi - -writable_device_allocated="$scratch_device_size" - -# first setup linear slices of the writable device -for i in ${!linear[@]}; do - [ -z "${linear[$i]}" ] && continue - read -r name crypt min max ignore <<< "${linear[$i]}" - free_space=$(( $writable_device_size - $writable_device_allocated )) - if [ "$min" -gt "$free_space" ]; then - echo "$0: Not enough space left for linear devices: ${linear[$i]}" - break - fi - # allocate its max if it fits within the free space, otherwise use the space left. - to_allocate="$max" - [ "$to_allocate" -gt "$free_space" ] && to_allocate="$free_space" - - if ! dmsetup_create_noudevsync "$name" "0 $to_allocate linear $writable_device $writable_device_allocated"; then - echo "$0: Failed to create linear device: ${linear[$i]}" - continue - fi - # TODO sane? - save_partition_info "$name" "*" "1" "$to_allocate" - if [ "$crypt" -ne 0 ] && \ - ! encrypt_device "/dev/mapper/$name" "${name}-crypt" "$to_allocate"; then - echo "$0: Failed to encrypt '$name'." - fi - writable_device_allocated=$(( $to_allocate + $writable_device_allocated )) -done - -# we are done with the physical device, use the scratch space from now on -writable_device="$scratch_device" -writable_device_size="$scratch_device_size" - -### -## THIN-PROVISIONING -### -declare -rg pool_metadata_dev="/dev/mapper/pool-metadata" -declare -rg pool_data_dev="/dev/mapper/pool-data" -declare -rg pool_dev="/dev/mapper/pool" -create_pool() { - # create external snapshot for read-only device - # create remaining thin volumes - modprobe dm-thin-pool || echo "$0: dm-thin-pool load failed, maybe builtin?" - # create temporary metadata device - data_block_size=255 - # calculate number of sectors needed and check boundaries: - metadata_dev_size="$(( 48 * $writable_device_size / $data_block_size / 512 ))" - # Min 2MB -> 4096 sectors, max 16GB -> 33554432 sectors - [ "$metadata_dev_size" -lt 4096 ] && metadata_dev_size="4096" - # TODO handle the exotic case of a too large metadata device to fit within RAM. - [ "$metadata_dev_size" -gt 33554432 ] && metadata_dev_size="33554432" - # TODO handle persistent metadata device on disk - # create RAMdisk in /run for metadata device - metadata_dev="$(mktemp -p /run/openslx .pool-metadata.XXX)" - dd of="$metadata_dev" bs=512 seek="$metadata_dev_size" &> /dev/null - metadata_dev="$(losetup --show --find $metadata_dev)" - if ! dmsetup_create_noudevsync "${pool_metadata_dev##*/}" \ - "0 $metadata_dev_size linear $metadata_dev 0"; then - echo "$0: Failed to create pool metadata device on '$writable_device'." - return 1 - fi - # For persistent metadata device we will need to cut that space off first: - # writable_device_size=$(( $writable_device_size - $metadata_dev_size )) - - if ! dmsetup_create_noudevsync "${pool_data_dev##*/}" \ - "0 $writable_device_size linear $writable_device 0"; then - echo "$0: Failed to create pool data device on '$writable_device'." - return 1 - fi - low_water_mark=32 - if ! dmsetup_create_noudevsync "${pool_dev##*/}" \ - "0 $writable_device_size thin-pool $pool_metadata_dev $pool_data_dev $data_block_size $low_water_mark"; then - echo "$0: Failed to create thin-pool device on '$writable_device'." - return 1 - fi - return 0 -} - -# create_volume "<name> <id> <size> <backing_dev>" -create_volume() { - if [ -z "$pool_dev" -o ! -b "$pool_dev" ]; then - echo "$0: Global pool device not set or present." - return 1 - fi - if [ $# -ne 1 -o -z "$1" ]; then - echo "$0: create_volume requires one non-empty argument." - return 1 - fi - local name id size backing_dev ignore - read -r name id size backing_dev ignore <<< "$1" - - if ! dmsetup message "$pool_dev" 0 "create_thin $id"; then - echo "$0: Failed to create thin volume with id '$id' in pool '$pool_dev'." - echo "$0: It might already exists, trying anyway..." - fi - if ! dmsetup_create_noudevsync "$name" "0 $size thin $pool_dev $id $backing_dev"; then - echo "$0: Failed to create external snapshot named '$name':" - echo " Size: $size" - echo " Backing device: $backing_dev" - echo " Thin volume id: $id" - return 1 - fi - return 0 -} -if [ -n "$thin_snapshot" ] || [ -n "$thin_volume" ]; then - if ! create_pool ; then - echo "Failed to create thin pool. Will ignore:" - echo -e "\tThin snapshot: $(declare -p thin_snapshot)" - echo -e "\tThin volumes: $(declare -p thin_volume)" - ramdisk_fallback - fi - # the order in which pool devices are created does not matter - # so start with thin volumes starting with id 2 and end with - # the thin-snapshot with id 1 which needs to call finish_setup. - volume_id=2 - # go over thin-volumes - for i in ${!thin_volume[@]}; do - [ -z "${thin_volume[$i]}" ] && continue - read -r name crypt min max ignore <<< "${thin_volume[$i]}" - # thin-volume can be safely created with max size, - # since they are overprovisioned anyway. - if ! create_volume "$name $(( volume_id++ )) $max"; then - echo "Failed to create thin volume '$name'." - fi - save_partition_info "$name" "*" "1" "${writable_device_size}-${max}" - if [ "$crypt" -ne 0 ] && ! encrypt_device \ - "/dev/mapper/$name" "$name-crypt" "$max"; then - echo "Failed to encrypt thin volume '$name'." - fi - done - - if [ -n "$thin_snapshot" ]; then - # create thin-snapshot, use first one - read -r name crypt min max ignore <<< "$thin_snapshot" - # min/max was used for the pool data device, ignore it here! - # NOTE: the filesystem will most likely malfunction if the size of the - # thin-snapshot is smaller than what it was upon creation. - # As such, the size of the thin-snapshot can only be $writable_device_size - # if it is larger than $read_only_device_size, otherwise we should only - # use $read_only_device_size. While live-shrinking the filesystem might be - # an option, it is not supported throughout all fileystems (xfs can't). - if (( writable_device_size >= read_only_device_size )); then - thin_snapshot_size="$writable_device_size" - else - thin_snapshot_size="$read_only_device_size" - fi - if ! create_volume "$name 1 $thin_snapshot_size $read_only_device"; then - echo "Failed to create external snapshot for '$read_only_device'." - ramdisk_fallback - fi - finish_setup "$name" "1" "$thin_snapshot_size" - fi -fi - -### -## SNAPSHOT (OLD FUNCTIONALITY) -### -if [ -n "$snapshot" ]; then - read -r name crypt min max ignore <<< "$snapshot" - if ! create_snapshot "$name $persist"; then - echo "Failed to create regular snapshot for '$read_only_device' on '$writable_device'." - ramdisk_fallback - fi - finish_setup "$name" "1" "$writable_device_size" -fi - -# ultimate fallback -ramdisk_fallback -exit 1 |