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

[Gene Cumm]

I believe the primary use case would be when you wish to target the
volume (i.e. grub-install /dev/sda1).

If the concern is size, this has been officially resolved with Boot Area
B's specifications.

https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg34016.html

  We do leave the first 1MB of each device alone.  Can we do 256K-1024K
  for the boot loader?  We don't have an immediate need for the extra
  space, but I'd like to reserve a little more than the extra 64KB.

With a small loader in Boot Area A and the primary payload in Boot Area
B, this should alleviate most size constraints.

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https://bugs.launchpad.net/bugs/759772

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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