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base-files: add support for rootfs mount options from cmdline

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Add support for configuring rootfs mount options from cmdline.

Rootfs mount options can be passed by declaring in the kernel
cmdline as much options as needed prefixed with "rootfs_mount_options."

An example usage is with rootfs with F2FS filesystem to enable
compress_algorithm to reduce flash wear by compressing the files before
writing to flash.

Example usage:
"... rootfs_mount_options.compress_algorithm=zstd ..."

To pass multiple options:
"... rootfs_mount_options.compress_algorithm=zstd rootfs_mount_options.noinline_data ..."

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
This commit is contained in:
Christian Marangi 2023-09-16 17:16:04 +02:00
parent ba9c1b1314
commit 0b23d3608c
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1 changed files with 20 additions and 1 deletions
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21
package/base-files/files/lib/preinit/80_mount_root
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@ -14,8 +14,27 @@ missing_lines() {
IFS="$oIFS"
}
# Rootfs mount options can be passed by declaring in the kernel
# cmdline as much options as needed prefixed with "rootfs_mount_options."
#
# Example:
# rootfs_mount_options.compress_algorithm=zstd rootfs_mount_options.noinline_data
#
compose_rootfs_mount_options() {
local mount_options
local cmdlinevar
for cmdlinevar in $(cat /proc/cmdline); do
if [ "$cmdlinevar" != "${cmdlinevar#rootfs_mount_options\.}" ]; then
append mount_options "${cmdlinevar#rootfs_mount_options\.}"
fi
done
echo $mount_options
}
do_mount_root() {
mount_root
mount_root start "$(compose_rootfs_mount_options)"
boot_run_hook preinit_mount_root
[ -f /sysupgrade.tgz -o -f /tmp/sysupgrade.tar ] && {
echo "- config restore -"