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[Launchpad Bug Tracker <1714185@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package flashcache -
3.1.3+git20150701-5ubuntu1

---------------
flashcache (3.1.3+git20150701-5ubuntu1) artful; urgency=medium

  * Initialize bi_op_flags in dm_io_request structures (LP: #1714185).
  * Fix DKMS compile for 4.13+ kernels (LP: #1706426).

 -- Stefan Bader <stefan.bader@xxxxxxxxxxxxx>  Wed, 30 Aug 2017 16:49:59
+0200

** Changed in: flashcache (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1714185

Title:
  flashcache is not usable on kernel version 4.8 and later

Status in flashcache package in Ubuntu:
  Fix Released
Status in flashcache source package in Xenial:
  In Progress
Status in flashcache source package in Zesty:
  In Progress

Bug description:
  SRU justification:

  Impact:
  The flashcache DKMS module is building but due to an incomplete adaptation for the bi_op/bi_opf split the resulting device-mapper logical volume is not properly writing back data to the backing device.
  !!! It is possible to write to the volume but the data is LOST !!!

  Fix:
  When setting up internal device-mapper IO structures we *must* also initialize bi_op_flags. At least when the structure is on the stack and is set up with individual assignments. Maybe it would not be required for the { ... } form but better be explicit in all cases.

  Testcase:
  - prereq: two block devices (disks or partitions), for testing this can also
    be loop devices. also need flashcache-utils and flashcache-dkms
  - run "sudo flashcache-create -p back <name> <cache-dev> <backing-dev>"
  - run "sudo mkfs.ext4 /dev/mapper/<name>"
  - run "sudo fsck -f /dev/mapper/<name>"
  - run "sudo dmsetup remove <name>" (this can take a bit)
  - run "sudo fsck -f <backing-dev>"

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