After making my system work again, which took a while since most live
media and even the installer don't support LVM cache, I had it working
for writeback on my system with the following.
/etc/initramfs-tools/hooks/lvm2_cache
{{{
#!/bin/sh
PREREQ="lvm2"
prereqs()
{
echo "$PREREQ"
}
case $1 in
prereqs)
prereqs
exit 0
;;
esac
if [ ! -x /sbin/lvm ]; then
exit 0
fi
. /usr/share/initramfs-tools/hook-functions
copy_exec /usr/sbin/cache_check
copy_exec /usr/sbin/cache_dump
copy_exec /usr/sbin/cache_metadata_size
copy_exec /usr/sbin/cache_repair
copy_exec /usr/sbin/cache_restore
for x in dm_cache_cleaner dm_cache_smq dm_cache dm_persistent_data dm_bio_prison
do
manual_add_modules ${x}
done
}}}
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https://bugs.launchpad.net/bugs/1423796
Title:
Unable to mount lvmcache root device at boot time
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1423796/+subscriptions
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