[tboot-devel] Missing "rootflags=subvol=root" for Btrfs

[Heting W. <me...@im...>]

All GRUB configurations generated for tboot misses "rootflags=subvol=root" and causes boot failure:

if [ -z "${kernelopts}" ]; then
  set kernelopts="root=UUID=f4131454-9e14-4af9-b28e-93afc232a8b2 ro rootflags=subvol=root rd.luks.uuid=luks-3fc85411-b08c-4185-b41d-bc0950877aeb rhgb quiet "
fi

……

submenu "tboot 1.10.5" {
menuentry 'Fedora GNU/Linux, with tboot 1.10.5 and Linux 6.4.10-100.fc37.x86_64' --class fedora --class gnu-linux --class gnu --class os --class tboot {
        insmod multiboot2
        insmod part_gpt
        insmod ext2
        set root='hd1,gpt2'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt2 --hint-efi=hd1,gpt2 --hint-baremetal=ahci1,gpt2  85215e34-eff0-4cba-9f44-f9c485483800
        else
          search --no-floppy --fs-uuid --set=root 85215e34-eff0-4cba-9f44-f9c485483800
        fi
        echo    'Loading tboot 1.10.5 ...'
        multiboot2      /tboot.gz logging=serial,memory,vga
        echo    'Loading Linux 6.4.10-100.fc37.x86_64 ...'
        module2 /vmlinuz-6.4.10-100.fc37.x86_64 root=UUID=f4131454-9e14-4af9-b28e-93afc232a8b2 ro rd.luks.uuid=luks-3fc85411-b08c-4185-b41d-bc0950877aeb rhgb quiet intel_iommu=on noefi
        echo    'Loading initial ramdisk ...'
        module2 /initramfs-6.4.10-100.fc37.x86_64.img
        echo    'Loading sinit SNB_IVB_SINIT_20190708_PW.bin ...'
        module2 /SNB_IVB_SINIT_20190708_PW.bin
}