Public bug reported:

nbd does not handle a disk resize correctly. This has been fixed
upstream:
https://github.com/torvalds/linux/commit/639812a1ed9bf49ae2c026086fbf975339cd1eef

On Ubuntu Bionic with a "4.15.0-34-generic #37-Ubuntu" kernel a resize
of a (Ceph) rbd image does not propagate to a "rbd-nbd" mapped disk,
until it's unmapped / remapped. See
https://tracker.ceph.com/issues/23137. Other "nbd" mapped disks might
suffer from the same behaviour (not tested).

Ubuntu mainline kernel (4.19-rc5) works correct with regards to this rbd
resize rbd-nbd mapped image.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: nbd rbd-nbd

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https://bugs.launchpad.net/bugs/1794766

Title:
  Apply upstream kernel fix to relevant Ubuntu kernels

Status in linux package in Ubuntu:
  New

Bug description:
  nbd does not handle a disk resize correctly. This has been fixed
  upstream:
  
https://github.com/torvalds/linux/commit/639812a1ed9bf49ae2c026086fbf975339cd1eef

  On Ubuntu Bionic with a "4.15.0-34-generic #37-Ubuntu" kernel a resize
  of a (Ceph) rbd image does not propagate to a "rbd-nbd" mapped disk,
  until it's unmapped / remapped. See
  https://tracker.ceph.com/issues/23137. Other "nbd" mapped disks might
  suffer from the same behaviour (not tested).

  Ubuntu mainline kernel (4.19-rc5) works correct with regards to this
  rbd resize rbd-nbd mapped image.

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