Idea: Improve ext2 to allow for embedding

[Dr. Tilmann Bubeck]

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