[Bug 1365874] Re: Ubuntu 12.04 LTS, 14.04 LTS, 16.04 LTS do not support ext4 metadata checksumming

[Marc Peña]

I would like to test this configuration in my laptop with a slow
rotational disk + a small SSD:
https://raid6.com.au/posts/fs_ext4_external_journal_caveats/

But, if I understood correctly, I need to configure journal_async_commit
for it to be reliable, and that option automatically enables
journal_checksum, that it's not available in the current e2fsprogs
version that ubuntu 16.04 has...am I missing something?

I also think that what Simon comments about the SRU is quite sensible,
but if getting a SRU is too hard, would it make sense to open a ticket
requesting a backport from bionic to xenial?

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https://bugs.launchpad.net/bugs/1365874

Title:
  Ubuntu 12.04 LTS, 14.04 LTS, 16.04 LTS do not support ext4 metadata
  checksumming

Status in e2fsprogs package in Ubuntu:
  Triaged

Bug description:
  In the Trusty release notes "Metadata checksumming" is listed as one
  of the tech highlights of kernel 3.13.

  https://wiki.ubuntu.com/TrustyTahr/ReleaseNotes#New_features_in_14.04_LTS

  However, the userland tools do not support this kernel feature. To the
  best of my knowledge this will be supported in 1.43, and won't be
  backported to 1.42.

  IMHO this is very misleading. It's like a car salesperson sold you a
  sports car with an V8 engine. After you drove it home, you opened the
  hood and realized only 6 cylinders are working because 2 of the spark
  plugs were not included, and you have to buy aftermarket ones.

  <rant>BTW, I've been following the development of e2fsprogs for over a
  year. 1.43  release has been in limbo for God knows how long :(
  </rant>

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