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sysupgrade-nand: allow limiting rootfs_data by setting env variable

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Check if firmware environment variable 'rootfs_data_max' exists and is
set to a numerical value greater than 0. If so, limit rootfs_data
volume to that size instead of using the maximum available size.

This is useful on devices with lots of flash where users may want to
have eg. a volume for persistent logs and statistics or for external
applications/containers. Persistence on rootfs overlay is limited by
the size of memory available during the sysugprade process as that
data needs to be copied to RAM while the volume is being recreated
during sysupgrade. Hence it is unsuitable for keeping larger amounts
of data accross upgrade which makes additional volume(s) for
application data desirable.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2021-02-17 15:17:49 +00:00
parent 330bd380e8
commit 5c10f26c28
1 changed files with 16 additions and 4 deletions
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20
package/base-files/files/lib/upgrade/nand.sh
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@ -117,6 +117,9 @@ nand_restore_config() {
nand_upgrade_prepare_ubi() {
local rootfs_length="$1"
local rootfs_type="$2"
local rootfs_data_max="$(fw_printenv -n rootfs_data_max 2>/dev/null)"
[ -n "$rootfs_data_max" ] && rootfs_data_max=$(($rootfs_data_max))
local kernel_length="$3"
local has_env="${4:-0}"
@ -176,11 +179,11 @@ nand_upgrade_prepare_ubi() {
# update rootfs
if [ -n "$rootfs_length" ]; then
local root_size_param
local rootfs_size_param
if [ "$rootfs_type" = "ubifs" ]; then
root_size_param="-m"
rootfs_size_param="-m"
else
root_size_param="-s $rootfs_length"
rootfs_size_param="-s $rootfs_length"
fi
if ! ubimkvol /dev/$ubidev -N $CI_ROOTPART $rootfs_size_param; then
echo "cannot create rootfs volume"
@ -190,7 +193,16 @@ nand_upgrade_prepare_ubi() {
# create rootfs_data for non-ubifs rootfs
if [ "$rootfs_type" != "ubifs" ]; then
if ! ubimkvol /dev/$ubidev -N rootfs_data -m; then
local availeb=$(cat /sys/devices/virtual/ubi/$ubidev/avail_eraseblocks)
local ebsize=$(cat /sys/devices/virtual/ubi/$ubidev/eraseblock_size)
local avail_size=$(( $availeb * $ebsize ))
local rootfs_data_size_param="-m"
if [ -n "$rootfs_data_max" ] &&
[ "$rootfs_data_max" != "0" ] &&
[ "$rootfs_data_max" -le "$avail_size" ]; then
rootfs_data_size_param="-s $rootfs_data_max"
fi
if ! ubimkvol /dev/$ubidev -N rootfs_data $rootfs_data_size_param; then
echo "cannot initialize rootfs_data volume"
return 1
fi