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[Launchpad Bug Tracker <1759848@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package zfs-linux - 0.6.5.6-0ubuntu24

---------------
zfs-linux (0.6.5.6-0ubuntu24) xenial; urgency=medium

  * Allow multiple mounts of zfs datasets (LP: #1759848)
    - Change zpl_mount() to call sget() directly with it's own test
      callback. Passing the objset_t object as the fs data allows
      checking if a superblock already exists for the dataset, and in
      that case we just need to return a new reference for the sb's
      root dentry.

 -- Colin Ian King <colin.king@xxxxxxxxxxxxx>  Thu, 25 Jun 2018 14:31:14
+0100

** Changed in: zfs-linux (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1759848

Title:
  Allow multiple mounts of zfs datasets

Status in linux package in Ubuntu:
  Fix Released
Status in zfs-linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in zfs-linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in zfs-linux source package in Bionic:
  Fix Released

Bug description:
  === SRU Justification, Xenial ==

  An attempt to mount an already mounted zfs dataset should return a new
  mount referencing the existing super block, but instead it returns an
  error. Operations such as bind mounts and unsharing mount namespaces
  create new mounts for the sb, which can cause operations to fail which
  involve unmounting and remounting the dataset.

  == Fix ==

  Backport of upstream fix https://trello.com/c/l89Ygj28/352-allow-
  multiple-mounts-of-zfs-datasets to allow multiple mounts

  This fix from Seth addresses this issue

  == Regression potential ==

  Like all backports, this has a potential to be incorrectly backported
  and break the ZFS mounting. However, any breakage should be picked up
  via the ZFS smoke tests that thoroughly exercise mounting/dismounting
  options.  At worst, the mounting won't work, but this has been tested,
  so I doubt this is a possibility.

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