group.of.nepali.translators team mailing list archive

[Łukasz Zemczak <1858802@xxxxxxxxxxxxxxxxxx>]

Hello Mauricio, or anyone else affected,

Accepted util-linux into xenial-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/util-
linux/2.27.1-6ubuntu3.10 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: util-linux (Ubuntu Disco)
       Status: In Progress => Won't Fix

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https://bugs.launchpad.net/bugs/1858802

Title:
  libblkid: no bcache UUID due to ambivalent detection of bcache and
  xfs_external_log for regular xfs in bcache backing device

Status in util-linux package in Ubuntu:
  Fix Released
Status in util-linux source package in Xenial:
  Fix Committed
Status in util-linux source package in Bionic:
  Fix Committed
Status in util-linux source package in Disco:
  Won't Fix
Status in util-linux source package in Eoan:
  Fix Committed
Status in util-linux source package in Focal:
  Fix Released
Status in util-linux package in Debian:
  Unknown

Bug description:
  [Impact]

   * Users with an XFS filesystem on top of bcache
     (this is seen on some ceph, cloud deployments)
     might fail to reference the bcache device by
     UUID or other udev properties.

   * The journal of the regular XFS filesystem in
     the bcache device is incorrectly detected as
     an XFS external log; so two superblocks are
     detected (bcache and xfs_external_log).

   * Thus blkid fails with ambivalent superblocks
     detected then doesn't provide the usual udev
     properties (UUID, etc.)

   * The fix improves the probe function for XFS
     external log so it detects it's regular XFS
     and bails out.

  [Test Case]

   * See test steps detailed in comment #7 and later.
     - Create an XFS filesystem with the journal/log
       in the beginning of the bcache device (< 256K).
     - Stop the bcache device.
     - Run '$ blkid -o udev -p $BCACHE_BACKING_DEVICE'.

     $ sudo make-bcache -B $BACKING_DEV
     $ sudo mkfs.xfs -d agsize=16m -l agnum=0 -f $BCACHE_DEV
     $ echo 1 | sudo tee /sys/block/$(basename $BCACHE_DEV)/bcache/stop
     $ sudo blkid -o udev -p $BACKING_DEV

  [Regression Potential]

   * The patch only changes the detection function
     for XFS external log to be more general about
     the sector where the magic of regular XFS may
     be found (which is shifted inside the bcache.)

   * It still checks at sector zero (the only one
     checked previously), so this behavior didn't
     change.

   * Possible regressions are actual XFS external
     log devices that are not anymore detected as
     such. (Although that would probably indicate
     a different bug in libblkid.)

  [Other Info]
   * upstream commit:
     https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/?id=d756af7d640c51ce8d1414607bd3f17eeecf2424

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