Bug#309218: grub and xfs

[David Everly]

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While the patch in this bug removes the freeze followed by an attempt to
write (always guaranteed to have a lockup!), my testing indicates that
this patch doesn't cover all the possible scenarios within grub-install.

And even if this patch was corrected to cover all the scenarios, it will
still fail intermittently until the following bug is addressed:

   http://bugs.debian.org/306966

Because of that kernel bug, some unknown amount of time is needed to
wait until everything is synced.

The patch to grub-install.in (found in the following bugs) addresses
these two issues:

http://bugs.debian.org/239111

   http://bugs.debian.org/cgi-bin/bugreport.cgi/xfs_freeze.diff?bug=3D23911=
1&msg=3D97&att=3D1

http://bugs.debian.org/243835

   http://bugs.debian.org/cgi-bin/bugreport.cgi/xfs_freeze.diff?bug=3D24383=
5&msg=3D34&att=3D1

http://bugs.debian.org/246111

   http://bugs.debian.org/cgi-bin/bugreport.cgi/xfs_freeze.diff?bug=3D24611=
1&msg=3D35&att=3D1

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