If users choose to build OpenWrt with btrfs included
and want to use a btrfs RAID for overlay/extroot,
then devices need to be scanned *before* mounting overlay/extroot.
If not, btrfs won't find all RAID drives and fail to mount.
This commit:
- creates a duplicate (symlink) of the btrfs scan script so that it runs
both before and after overlay/extroot mount,
- changes the scan command to not depend on blkid (-d),
- outputs the scan results to kernel log to show what's being detected,
as the system logger is not yet running.
Signed-off-by: Marius Dinu <m95d+git@psihoexpert.ro>
afcf845b0b