Hello David,
Two questions were raised just after publishing 'all-flash-space' patch.
Now I am ready to provide more information on these issues:
0. Downgrade to vendor firmware.
It is possible. Just don't forget to erase both ubi concat partitions:
'mtd -r erase ubi' does the job fine.
1. Sysupgrade:
> >
> > Have you tried if this breaks sysupgrade from an older OpenWrt
> > firmware? I'm not sure if an UBI resize works without additional
> > steps.
> >
You were right, rootfs_data volume stays small after sysupgrade. My
approach is to execute 'ubirsvol' command for /dev/ubi0_1 and allocate
all available space. There are caveats however:
* command cannot be run after rootfs_data is mounted (device busy)
* command cannot be run in sysupgrade sequence (sysupgrade works in old
system that is not mtd-concat aware)
I came out with a solution - to plug into preinit phase after ubi is
available but before ubi rootfs_data volume is started and incorporated
into overlayfs. Here is script (only for ath79/nand target so path is
target/linux/ath79/nand/base-files/lib/preinit/78_ubi_grow_rootfs_data).
I've tested it by running sysupgrade on my WNDR4300 and volume was
resized correctly.
----
#!/bin/sh
grow_ubi_volume() {
local free_lebs="$(ubinfo /dev/ubi0 | awk '$1=="Amount" &&
$3=="available" { print $6 }')"
local used_lebs="$(ubinfo /dev/ubi0_$1 | awk '$1=="Size:" { print $2
}')"
if [ $free_lebs -eq 0 ] ; then
return
fi
echo "- grow ubi volume (id $1) -"
ubirsvol /dev/ubi0 -n $1 -S $(($used_lebs+$free_lebs))
}
do_grow_ubi_rootfs_data() {
local board_name="$(cat /tmp/sysinfo/board_name || echo '')"
case "$board_name" in
netgear,wndr3700-v4|\
netgear,wndr4300)
grow_ubi_volume 1
;;
esac
}
boot_hook_add preinit_main do_grow_ubi_rootfs_data
----
I'll gladly read your opinion on above solution. Can it be accepted into
mainline ?
Best regards
Michal
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