Comment 3 for bug 897421

The existing patchset has essentially been re-written and resubmitted by Jan Kara.

https://lkml.org/lkml/2012/3/5/278

"Hallelujah,

  after a couple of weeks and several rewrites, here comes the third iteration
of my patches to improve filesystem freezing. Filesystem freezing is currently
racy and thus we can end up with dirty data on frozen filesystem (see changelog
patch 06 for detailed race description). This patch series aims at fixing this."