Public bug reported:
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>"
** Affects: flashcache (Ubuntu)
Importance: High
Assignee: Stefan Bader (smb)
Status: In Progress
** Patch added: "init-bi-op-flags.patch"
https://bugs.launchpad.net/bugs/1714185/+attachment/4941783/+files/init-bi-op-flags.patch
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https://bugs.launchpad.net/bugs/1714185
Title:
flashcache is not usable on kernel version 4.8 and later
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