e4e1776613
This patch reserves space for the GRUB environment block inside the Btrfs header. The block is placed at an offset of GRUB_ENV_BTRFS_OFFSET, 256 KiB from the start of the device, and occupies one sector. To protect the space, overflow guard sectors are placed before and after the reserved block. The Btrfs header already defines regions for bootloader use. By adding this entry, GRUB gains a fixed and safe location to store the environment block without conflicting with other structures in the header. Add Btrfs and its reserved area information to the fs_envblk_spec table. With the groundworks done in previous patches, the function is now complete and working in grub-editenv. Signed-off-by: Michael Chang <mchang@suse.com> Reviewed-by: Neal Gompa <ngompa13@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'