On Mon, Dec 13, 2021 at 02:25:49PM +0800, Michael Chang via Grub-devel wrote: > Up to now GRUB can only embed to the first 64 KiB before primary > superblock of btrfs, effectively limiting the size that could > consequently pose restrictions to feature enablement like advanced zstd > compression. > > This patch attempts to utilize full unused area reserved by btrfs for > bootloader outlined in the document [1] where this paragraph quoted. > > "The first 1MiB on each device is unused with the exception of primary > superblock that is on the offset 64KiB and spans 4KiB." > > Apart from that, adjacent sectors to superblock and first block group > are not used for embedding in case of overflow and logged access to > adjacent sectors could be useful to tracing it up. > > This patch has been tested to provide out of the box support to btrfs > zstd compression with which GRUB has been installed to the partition. > > [1] > https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs(5)#BOOTLOADER_SUPPORT > > Signed-off-by: Michael Chang <mch...@suse.com>
Reviewed-by: Daniel Kiper <daniel.ki...@oracle.com> Daniel _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
