I would like to propose a change to GRUB to allow embedding (fs_embed)
of core.img for ext2/3/4 into the
filesystem. This allows the installation of GRUB into ext2 without the
need to use (unsafe) block lists.
It will be realized using the ioctl(EXT4_IOC_SWAP_BOOT) introduced into
Linux 3.10 in 2013. This ioctl basically swaps the data blocks of the
associated file with the EXT2_BOOT_LOADER_INO inode. After using the
ioctl the code of core.img is stored in the BOOT_LOADER incode of the
filesystem and it is not accessible to file system tools anymore. This
ensures, that the boot code is safe and installation into a partition is
possible.
What would you think about this proposal. Are you willing to integrate
this, if I develop this for GRUB?
Changes will be done mainly in setup.c and ext2.c
Kind regards
Tilmann Bubeck
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