kernel-packages team mailing list archive

[Dexuan Cui <decui@xxxxxxxxxxxxx>]

ext2.ko itself does support fsfreeze, but typical linux distros, like
Ubuntu, don't supply ext2.ko at all now -- instead, they usually supply
ext3.ko and have ext4 built-in.

So when we mount an ext2 partition, actually the kernel is registering
the ext4 driver as an ext2 driver and in this case the ext2's
s_op->freeze_fs is NULL -- so fsfreeze on ext3 can get -EOPNOTSUPP.

The discussion is at http://marc.info/?t=141102289600007&r=1&w=2

The ext4 community has posted the patches to support ext2 fsfreeze when registering ext4 as ext2:
http://marc.info/?l=linux-ext4&m=141107200212887&w=2
http://marc.info/?l=linux-ext4&m=141107200312889&w=2
http://marc.info/?l=linux-ext4&m=141107481213962&w=2

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https://bugs.launchpad.net/bugs/1362574

Title:
  hyper-v: Manual partitioning formats /boot with ext2 file-system -
  Utopic Unicorn

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  This is a thread continuation from trusty bug ID 1297012, not a
  duplicate.

  The last outcome from it was that the issue was not going to be fixed
  in 14.04, please consider this for 14.10 Utopic Unicorn if possible.

  "Dimitri John Ledkov (xnox) wrote on 2014-04-07:	#9
  Hello Abhishek and Phillip,

  I've discussed this with a few other engineers and it is to risky to
  push such change this close to release. There are a few things that
  are planned / needed to be done with "/boot" and we should target it
  at u-series. This is a valid bug report / request, but i'm targeting
  it at u-series for now.

  We need to increase size of /boot, use ext4 (possible with journal,
  extents and huge file options disabled), remove need for /boot at all
  when one is using simple LVM volume group only. All of these changes
  are straight-forward, but can have impact on existing deployments and
  these are not features we'd be comfortable with deploying so late in
  the cycle, way past Feature Freeze.

  Regards,

  Dimitri."

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