[Bug 759772] Re: grub2: btrfs: does not install core.img to boot block

[Christian Reis]

I'm curious about the impact of this bug, as I've been able to install
grub2 and use it to boot a btrfs root partition configured as raid-1
just fine .

Does it mainly affect installations where btrfs is installed on the
entire block device, with no partition table?

What about installations that put grub inside the actual partition (i.e.
grub-install /dev/sda1)?

Is 64kb enough to hold the larger core.img files in, say, an
LVM+RAID+btrfs setup as per bug 1059827?

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Title:
  grub2: btrfs: does not install core.img to boot block

Status in “grub2” package in Ubuntu:
  Triaged
Status in “grub2” source package in Natty:
  Won't Fix
Status in “grub2” source package in Oneiric:
  Won't Fix

Bug description:
  Binary package hint: grub2

  btrfs reserves the first 64kiB for boot loaders as its CoW (Copy-On-
  Write) features mean that a file may change logical blocks.  This area
  may also be referred to as the "embed area", "embedded area" or
  "embedding area", depending on the context.  core.img must be
  installed to this area to ensure that other files may be read
  appropriately.

  This depends on (LP: #757446) which has already been fixed.  A patch
  resolving this has seen some testing already.

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